US3862617A

US3862617A - Rotary glue box apparatus

Info

Publication number: US3862617A
Application number: US355063A
Authority: US
Inventors: Paul G Prestegaard
Original assignee: Individual
Current assignee: Individual
Priority date: 1973-04-27
Filing date: 1973-04-27
Publication date: 1975-01-28
Anticipated expiration: 1992-01-28

Abstract

Rotary glue apparatus for glue printing in registered areas on blanks that include a pair of generally half-cylindrical glue reservoirs releasably clamped on a rotatable shaft, each reservoir having a hollow cavity for holding a supply of glue and an exterior circumferential wall portion having a radially inner perforated metal sheet, an intermediate layer of foam sheet rubber, and an outer transparent layer of a material such as Mylar that is impervious to glue, and a cam operated pump that for each cycle forces a pulse of air into the reservoir to offset the depleting quantity of glue in the reservoir; and also a positive pulse of pressure just prior to the printing part of the cycle and then a negative pressure pulse at the end of the printing part of the cycle to provide a push-pull effect on the glue in the reservoir. The Mylar sheet is cut out in the desired pattern and then affixed on the respective glue reservoir to compress the foam rubber sheet so that glue will permeate the rubber sheet only in the area of the cut out pattern in the Mylar sheet.

Description

United States Patent 1 Prestegaard [451 Jan. 28, 1975 1 1 ROTARY GLUE BOX APPARATUS Apr. 27, 1973 {76] Inventor:

{22] Filed:

{21] Appl, No.: 355,063

[52] US. Cl 118/213, 118/259, 118/406,

101/119, 101/367 [51] Int. Cl. B05c 1/16 [58] Field of Search 118/212, 213, 259, 406, 118/211; 101/119, 367, 366, 120, 125, 328; 29/124 [56] References Cited UNITED STATES PATENTS 949.437 2/1910 Munk 101/367 2.092.242 9/1937 Brasseur 101/119 2.753.641 7/1956 Dorman i 101/328 2 8l9 668 l/l958 McAneny 101/125 3 146 703 9/1964 Mason et a1. 101/125 3.224.411 12/1965 Bzaha et a1. .1 118/411 X 3.408.984 ll/l968 Pullins 118/259 Primary Examiner-John P. Mclntosh' Attorney, Agent, or Firm-Dugger, Johnson & Westman [57] ABSTRACT Rotary glue apparatus for glue printing in registered areas on blanks that include a pair of generally halfcylindrical glue reservoirs releasably clamped on a r0- tatable shaft, each reservoir having a hollow cavity for holding a supply of glue and an exterior circumferential wall portion having a radially inner perforated metal sheet, an intermediate layer of foam sheet rubher, and an outer transparent layer of a material such Mylar that is impervious to glue, and a cam operated pump that for each cycle forces a pulse of air into the reservoir to offset the depleting quantity of glue in the reservoir; and also a positive pulse of pressure just prior to the printing part of the cycle and then a negative pressure pulse at the end of the printing part of the cycle to provide a push-pull effect on the glue in the reservoir. The Mylar sheet is cut out in the desired pattern and then affixed on the respective glue reservoir to compress the'foam rubber sheet so that glue will permeate the rubber sheet only in the area of the cut out pattern in the Mylar sheet.

40 Claims, 7 Drawing Figures PATENTED S 3.852.617

SHEEI 10F 4 m 55; i E;

fil l {I l ROTARY GLUE BOX APPARATUS BACKGROUND OF THE INVENTION In the prior art, for example U.S. Pat. No. 2,553,592 to Kucklinsky, there is disclosed a cylindrical coating roller having radially extending channels that extend to a templet, and a glue reservoir remote from the roller that is provided with a piston to impart expressing pulses to the glue which is conducted through a rotary gland to the roller; and in U.S. Pat. No. 3,408,984 to Pullins there is disclosed a hollow cylindrical drum into which glue is pumped from a stationary reservoir. With such prior art structures rotary glands are required which are expensive and subject to leakage after wear. Further, the same positive pressure pulse on the glue is provided at the entire periphery of the glue printing roller which is undesirable. In order to overcome problems such as the above as well as others, this invention has been made.

SUMMARY OF THE INVENTION Rotary glue printing apparatus that includes a shaft, and a rotary glue reservoir mounted on the shaft to rotate therewith and having a hollow cavity for holding a supply of glue, the reservoir mounting a cam operated pump to force glue out of glue pad as the reservoir rotates.

One of the objects of this invention is to provide new and novel rotary glue reservoir apparatus. Another object of this invention is to provide new and novel self contained glue wheel segments on a rotary shaft for spot or strip application of liquid glue in registry on blanks.

An additional object of this invention is to provide a rotary glue printing reservoir with new and novel pressurizing mechanism for controlling pressure in the reservoir as the supply of glue in the reservoir is depleted. A further object of this invention is to provide a rotary glue printing reservoir with new and novel pump mechanism to provide a push-pull effect on the glue in the reservoir as the reservoir is rotated. In furtherance of each of the last two mentioned objects, it is another object of this invention to provide new and novel mechanism for adjustably controlling air pressure pulses within the reservoir.

A different object of this invention is to provide rotary glue printing apparatus with a new and novel glue pad. In furtherance of the last mentioned object, it is another object of this invention to provide a compressible intermediate glue pad portion and new and novel mechanism to bring the compressible portion into compression. In furtherance of each of the last two mentioned objects, it is another object of this invention to compress a pad portion to block the flow of glue therethrough and leave other portions sufficiently uncompressed to permit glue flow therethrough.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side view, generally taken along the line and in the direction of the arrows ll of FIG. 2, of the apparatus of this invention;

FIG. 2 is a front end view generally taken along the line and in the direction of the arrows 2-2 of FIG. 1, a portion of the cam mounting bracket being broken away;

FIG. 3 is an enlarged fragmentary vertical crosssectional view, generally taken along the line and in the direction of the arrows 3-3 of FIG. 2, to show the construction of the reservoirs and the mounting thereof on the shaft, said view showing the pump in a retracted, decreased cavity air pressure condition;

FIG. 4 is a further enlarged, fragmentary side view to more clearly show the tensioning mechanism for a glue pad, said view being generally taken along the line and in the directions of the arrows 4-4 of FIG. 5;

FIG. 5 is a further enlarged, fragmentary end view to more clearly show the pad tensioning mechanism, said view being generally taken along the line and in the direction of the arrows 55 of FIG. 4;

FIG. 6 is an enlarged fragmentary axial crosssectional view to more clearly show the structure of the glue pad and the bulging of the rubber sheet through the mask; and

FIG. 7 is an enlarged fragmentary cross-sectional view of one of the pumps in an-extended position increasing the air pressure in the reservoir cavity, and the structure adjacent the pump.

Referring now in particular to FIGS. 1 and 3, the apparatus of this invention includes a frame 11 on which there is rotatably mounted a glue wheel shaft 12 by mounting mechanism (not shown). The shaft is driven through a drive connection 13 by the conventional drive and feed mechanism 14. I

An annular hub 16 is keyed on the shaft at 17 to be driven thereby, the hub including an axially elongated, axially central cylindrical portion 160, and end portion 16f that is of a larger outer diameter than portion 16c to provide an annular surface 16b that extends perpen dicular to the axis of rotation in the shaft, and an opposite end portion 16g of a larger outer diameter than portion that provides a frustoconical surface 16a that in a radially outward direction is tapered to more closely approach surface 16b. The hub is made up of two half sections 16d, l6e that at their opposite ends are bolted together with bolts 18.

Mounted on the hub to rotate therewith is a glue wheel having two generally half-cylinder glue reser' voirs, generally designated 20 and 21 respectively. Since the reservoirs are of the same construction, for the most part only the construction of reservoir 20 will be set forth. The reservoir 20 includes a main inner wall 22 having a central, arcuately curved portion 22a that has an inner surface of the radius of curvature to form a close fit with hub surface 16c but of a slightly shorter axial length. The inner surface of portion 22a extends angularly through an arc of Joined to one axially extending edge portion of wall portion 22a is a wall portion- 22b that extends generally radially outwardly therefrom, while joined to the opposite axially extend ing edge portion of wall portion 22a to extend generally radially outwardly therefrom is a wall portion 22c. Wall portions 22b, 22c extend in diametrically opposite directions whereby the exterior surface of wall portion 22b of reservoir 20 forms a close fit with the exterior surface of wall portion 220 of reservoir 21. Wall portion 22a has a frusto-conical edge surface 24 that is of opposite taper from surface 16a to form a close fit therewith while the opposite end of wall portion 22a has a tapered surface 25 that is tapered radially outwardly in a direction toward surface 24. A plurality of clamps 26 are provided for each reservoir, each clamp having a tapered surface of an opposite taper from that of surface 25 to abut thereagainst and a surface portion 26a to abut against the circumferential outer surface of hub end portion 16f. The clamps are l'emovably secured to the hub by bolts 27 whereby tightening the bolts, the tapered surfaces of the clamps will force tapered surface portion 25 radially inwardly, and also axially toward surface 16a whereby the end of the hub axially remote from the clamps is firmly held by the hub. However, upon removing the clamps 26 for the respective reservoir, due to the spacing of surface 16b from surface 25, the wall portion 22a may be axially moved a slight distance toward surface 16b and thence moved both outwardly and in the same axial direction whereby the wall 22 may be separated from the hub. Further, through the provision of a number of separate clamps 26 for each of the

reservoirs

20, 21, one of the reservoirs can be separated from the hub while the other reservoir is retained in a clamp position on the hub.

Adjacent the surface 25, the wall 22 has a flange 22c to which the end wall 29 is secured by screws 30. Similarly, adjacent the axially opposite edge of the wall 22, wall 22 has a flange 22d to which the end wall 31 is secured by screws 30. The two end walls 31 of the

reservoirs

20, 21 in combination are of annular configuration as are the two end walls 29, provided the

reservoirs

20, 21 are mounted in a position of use on the hub. Extending between the

end walls

29, 31 adjacent the circumferential edge thereof to have their opposite ends abut against

walls

29, 31 are tie rods 32. The tie rods are secured to the end walls by flat head screws 33. A metal wall 34 of nearly a semiannular construction has arcuate edges abutting against the axially inner surfaces of

walls

29, 31; an axial extending edge abutting against the radially outwardly end portion of wall 22b; and an axially extending edge 34a spaced from wall 22c. The outer radius of curvature of wall 34 is somewhat less than the outer radii of curvature of walls 29,-31. The respective abutting edges of

walls

22, 31, 29 and 34 are in fluid sealing relationship, other than for edge 34a being spaced end wall 22c. Edge 34a abuts against one leg 38a of a generally right angle bracket 38 to be in fluid sealing relationship therewith while the other leg 38b abuts against a shoulder 39 formed by a cutout in wall 22c intermediate wall 22a and the axial extending edge thereof that is remote from wall 22a but that is much more closely adjacent said axial extending edge than wall 22a. Bracket 38 is secured to

walls

29, 31 and 22 by screws (not shown) while wall 34 likewise is secured to leg 38b, and

walls

22, 29 and 31. Thus

walls

29, 31, 32, 34 and bracket 38 define a hollow cavity 40 for containing a supply of glue.

The wall 34 has perforations 35 extending therethrough throughout the entire surface thereof other than at the outer peripheral edges thereof. Portions of wall 34 are supported by the tie rods in a manner which permit glue in the cavity to freely enter the apertures. Mounted on the wall 34 to extend axially between

walls

29, 31 and arcuately between the outer axially extending edge of leg 38a and the outer axially extending edge of wall 22b is a glue pad that includes a compression sheet 42 that in an uncompressed condition is pervious to glue, but when sufficiently compressed is impervious to glue. The compression sheet extends in abutting relationship to the radially outer surfaceof the wall 34, and is made of a material such as open celled, foam rubber. The glue pad also includes a plastic sheet 43 extended between walls '29, 31 and arcuately through about the same angle as the foam rubber sheet 42 to be in abutting relationship with the radially outer surface of the foam rubber sheet. The plastic sheet 43 is of a type that is impervious to the passage of glue, and preferably is transparent. The plastic sheet preferably is made of Mylar or of similar impervious, but fairly stiff and cutable transparent material. Slots or cutouts 45 are provided in the plastic sheet to correspond to configuration of the glue to be printed on the box blank 10 that is passed beneath the glue reservoir as it is rotated.

The one axially extending edge portions of the rubber and

plastic sheets

42, 43 are removablysecured to the wall portion 22b by clamp bars 46 having screws extended therethrough and threaded into said wall portion. The opposite edge portions of

sheets

42, 43 are secured to the leg 38a by clamp bars 47 in a manner set forth hereinafter.

In order to retain circumferentially intermediate portions of the rubber and plastic sheets in abutting relationship with the perforated wall 34 and for compressing the rubber sheet sufficiently to make it impervious to glue other than at the cutouts or slots 45, there is provided quick release tensioning mechanism that includes a plurality of axially spaced, elongated straps 50. The straps 50 are narrow, longitudinal, flexible steel bands. The straps 50, at their one ends, are secured to the edge of wall 22b by screws 51 with the straps abutting against the outer circumferential surface of the mask 43. The opposite end of each band is secured to the circumferential portion of a wheel 52. Each wheel is mounted on a stud shaft 53, a lever 56 extending through stud shaft and wheel extends radially outwardly of the wheel.

In the axially intermediate portion of the outwardly opening chamber 57 formed by the

walls

29, 31, 22c and angle bracket 38, a pair of lugs 54 are mounted on leg 38a to extend toward wall 22c. Lugs 54 are axially spaced to receive the wheel 52 therebetween and have slots opening toward wall 22c for rotatably receiving and mounting shaft 53. By moving the shaft into the slots in the lugs 54 and pivoting the wheel 52 in a direction of the arrow 55, the band attached to the wheel is tightened for holding the adjacent parts of the glue pad in compression and also the shaft is held against the end of the slot. A spring clip 58 hasone end secured to wall 220 and an opposite end abuttable against the lever 56 for retaining the wheel 52 in an angular position to retain the steel band 50 in tension. By pressing down on the said opposite end of the spring clip, the lever may be pivoted in the direction opposite the arrow 55 for permitting the steel band to be moved to a position to permit proper positioning the plastic and foam rubber sheets of the pad.

For retaining the steel bands that are adjacent the

end walls

29, 31 in tension, each of the end walls is provided with a generally .l-shaped slot that opens through the circumferential surfaces of the end wall and extends generally parallel to and intermediate wall portion 22c and leg 38a and therebetween, and thence curved to extend toward leg 38a. A lug 54 mounted by leg 38a is spaced from the respective end wall to receive a wheel 52 therebetween. Each of the last mentioned wheels has a steel band secured thereto and is mounted on a shaft 53 that mounts a lever 56 such as previously described. Similarly for each of the last mentioned levers, there is provided a spring clip 58. By positioning the shaft 53 in the lug and end wall slots and rotating the shafts in the direction of arrow 55, the bands are tensioned to compress the plastic and rubber sheets sufficiently to block passage of glue through the rubber sheet other than adjacent the cutouts in the mask. In the outwardly opening chamber there is located a filler cap 61 that is threaded into an aperture in leg 38b which provides a filling opening for filling the glue reservoir.

Each of the

reservoirs

20, 21 mounts an air pump generally designated 65 (see in particular. FIGS. 3 and 7), each air pump having a

housing

67, 68 that includes an annular wall 67 and a partition wall 68 to provide a housing chamber 70 that opens axially outwardly of the partitioned wall (direction parallel to the axis of'rotation of shaft 12). The annular housing wall 67 includes an axially intermediate, enlarged flange 67a for abutting against the end wall 31 with the axially inner portion of the housing extending through an aperture in the end wall and into the glue reservoir cavity. Flange 67a is bolted to the endwall for securing the housing to the reservoir. With the housing mounted in the aforementioned manner, the housing chamber 69 formed by the partition wall and annular wall opposite chamber 70 opens into the hollow cavity of the reser- VOII'.

A cover 71 that is removably secured to the housing to close the chamber 70. A valve stem 72 is axially slidably mounted by the partition wall and the cover to extend through chamber 70, the end of the valve stem outwardly of the cover mounting the cam follower wheel 73. Mounted on the opposite end of the valve stem to move therewith is the central portion of a rubber diaphragm 74, the outer peripheral edge of the diaphragm being mounted in a fixed position relative the housing annular wall by an annular member 75. As may be noted in FIG. 7, thediaphragm extends across the chamber 69 to in combination with the valve stem close the end of the chamber 69 opposite the partition wall.

Located within the chamber 70, and mounted on the valve stem to move therewith is a piston 80, a coil spring 81 at one end abutting against the partition wall and at the opposite end abutting against the piston for resiliently urging the piston and valve stem axially outwardly (direction of arrow 82).

The piston has apertures 83 extending therethrough. Reed valves 84 are mounted on the inner axial surface of the piston to permit airflow through the apertures when the piston is moved in the direction of the arrow 82; but that close when the piston is moving in the opposite direction, the reed valve being resiliently retained in a closed position. A bore 85 is provided in the cover to open to the chamber 70between the piston and cover to provide fluid communication between the chamber 70 and the ambient atmosphere.

Further, a bore 86 is provided in the housing to open into the interior of the glue reservoir and to the bore in the housing partition wall through which the valve stem is slidably extended. The valve stem blocks fluid flow between the chamber 70 and the bore 86 when the valve stem is in the axial outer position of FIG. 3, and in the axial inner position of FIG. 7; however, as the valve stem is moved between said positions, the notch 87 provides for fluid flow communication between bore 86 and chamber 70.

To move the valve stem axially inwardly in proper timed relationship, there is provided a cam 91 (see FIGS. 1 and 2). Bracket 93 is slidably mounted on the frame 11 and is bolted by a bolt 99 to the slide bar 94 that is provided in the groove 98 of the frame to be retained therein but that is movable in a direction parallel to the axis of rotation on the shaft 16. A bracket 95 is also slidably mounted on the frame and is secured by a bolt to a second slide bar that is slidably mounted in the groove 98. During normal operation, the bolt 100 is tightened sufficiently so that the slide bar into which it is threaded is retained in a clamped position to prevent the bracket 95 being moved. An adjustment screw 96 is freely rotatably extended through the bracket 95 in a fixed axial position relative thereto. and has an end portion threaded into the bracket 93 whereby upon rotating the adjustment screw 96 in the appropriate direction. the bracket 93 will be moved either toward'or away from the reservoirs to provide an adjustment for the cam to control the length of the strokes of the valve stems as the reservoirs are rotated by the shaft 12.

In using the apparatus of this invention, a sample blank is laid out flat and the area or areas on which the glue is to be printed are marked off so that they will be visible through the Mylar compression sheet 43. Next a properly sized Mylar compression sheet is laid over the flat blank and the glue areas are marked onto the Mylar sheet. Now the areas of the plastic sheet through which glue is to be printed are cut out. With the apparatus of this invention, working areas (cutouts) of about of an inch to l inch diameter ae the most practical,.however,if greater glue areasor lengths are necessary, then. a spaced series of glue dots (cutouts) may be provided.

With the glue reservoir removed from the shaft and no glue contained therein, the properly sized foam rubber sheet is positioned on theperforated wall 34 and thence theplastic mask positioned thereover. The one ends of the sheets '42, 43 are secured to the reservoir wall portion 22b by clamps 46 and the adjacent ends of straps 50 are mounted in place by screws 51. Thereafter, the opposite end of the central longitudinal strap 50 and its tensioning device are moved to locate the shaft 53 in the axial center lugs 54 and the lever 56 turned to be held in the tensioning position by the spring clip 58-whereby the strap is tensioned. The tensioning end of the

sheets

42, 43 are now further loosely clamped down by clamps 47 by screws being threaded into the leg 38a. Thereafter, the two outside longitudinal bands 50 have their wheels and shafts positioned in the slots of the lugs and end walls and the levers 56 moved to be retained in their clamping position by spring clips. This tensioning of the straps results in portions of the rubber pad extruding through the cutouts. Now the screws for-clamps 47 are tightened and then the glue is put into the glue reservoir and the reservoirs are clamped to the hub by clamps 26. After two or three rotations of the shaft 12, the glue will start to bleed through the foam rubber sheets where they extrude through the mask cutouts.

Now the drive to the shaft 12 is started and the drive and feed mechanism 14 feeds the blank 10 in appropriate timed relationship to the angular position of the glue wheel to have the glue spot printed on the blank in proper registry. As the upper glue reservoir, which for the purposes of the description will be considered reservoir 20, is moved angularly downwardly, the reservoir is moved to a position that the cam follower 73 bears against the cam surface of cam 91, and the reservoir is further rotated, the valve stem thereof is moved axially inwardly (in a direction opposite arrow 82). The initial movement of the valve stem initially compresses the air in chamber 70 axially between the piston and the housing partition wall, while creating a vacuum between the piston and cover 71 to draw air inwardly through the bore 85. After the valve stem is moved sufficiently that a notch 87 in the valve stem opens to bore 86, a pulse of pressurized air flows from the portion of chamber 70 between the piston and partition wall. through bore 86 and into the reservoir cavity. At the same time that the valve stem is moving axially inwardly, the central part of the diaphragm 74 is being moved in a direction to increase the air pressure within the reservoir. The pressurized pulse provided by the movement of the diaphragm aids in forcing glue through the sheet of rubber adjacent the mask cutouts just prior to and as the cutouts pass over the box blank; while the pulse of pressurized air passing through the bore 86 from chamber 70 serves to compensate for the loss of pressure in the reservoir resulting'from glue passing through the glue pad that otherwise would occur, i.e., to compensate for the proportionate volume of glue to air in the reservoir that gradually changes as the glue is used up. As the cutouts of the plastic sheet move angularly out of contact with the blank, the cam follower wheel of reservoir 20 is permitted by the cam to progressively move axially outwardly (due to the action of coil spring 81). The axial outward movement of the valve stem results in the valve stem moving to a position to block the bore 86. The piston in, further moving toward the cover providesa vacuum between the piston and partition wall to force the reed valves open to permit air flow into the portion of the chamber 70 between the housing partition wall and the piston. Additionally, the axial outward movement of the valve stem moves the central part of the diaphragm toward the partition wall, and thus decreases the air pressure in the reservoir. This serves to draw glue from the glue pad back into the reservoir cavity.

The cam may be moved axially toward the reservoir 20 to provide a greater pulse stroke as the glue is used up (if needed). A greater pump stroke will create a greater pulse of air to fill the reservoir increasing need for air and also to provide a greater push-pull effect from the diaphragm which offsets the declining centrifugal force from the smaller mass of liquid glue in the reservoir. As a result, good running control of the amount of glue bled through the glue pad onto'each box blank is obtained.

With the apparatus of this invention, in operation, the liquid glue in the glue reservoirs is relatively quiet and is enclosed so as not to be exposed to the open air. In prior art apparatus where the glue is constantly exposed to open air, glue is continually churned and rolled in the open air. This continuing aeration results in evaporation of solvent and gradual thickening of glue which makes the entire quality and control difficult. In the present system of this invention, the vacuum pressure by the diaphragm (movement in the direction of arrow 82) on the glue reservoir sucks the glue back into the pad for the balance of the cycle of the drum rotation, i.e., until the valve stem is again moved in a direction opposite arrow 82.

It is to be understood that even though that as described herein, each of the reservoirs extends through an arcuate angle of 180, a rotary glue drum of this invention may be divided into more than two segments.

Each wheel segment would be self contained entity having a glue reservoir, a cam operated pulse pump and a glue pad such as describedherein other than the arcuate extent of each segment would be of a different arcuate angle from that of

reservoirs

20, 21. Further. each wheel segment would be separately removable from the common hub 16 without disturbing the other segments. Also to be mentioned is that due to the provision of the clamp bolts 18 for the hub, the bolts 18 may be loosened so that the complete wheel and hub assembly may be adjusted axially along the length of the shaft 12; and thence the clamp bolts tightened. Further by loosening the clamp bolts 27 the reservoirs (wheel segments) may be rotated on the hub 16 and then locked into a position for ease in bringing the glue spots into registry on the blank.

Further, even though this invention has been described with reference to printing glue on blanks, it may be used for printing other suitable types of liquid materials onto blanks, however, the prime use of this invention is in conjunction with'folder/gluer machines which rapidly produce envelopes, folding cartons or corrugated containers.

' As an example of the invention, but not otherwise has a limitation thereon, metal sheet 34 may be Vs inch thick perforated steel which is supported underneath by the tie rods, the foam rubber. sheet of about /8 /2 inch thick in a non-compressed condition, and a plastic sheet of about 3/32 inch Mylar or similar impervious, fairly stiff, but cutable and transparent material. Advantageously, a valve stem stroke for each pump is about an inch to start a production run. The stroke distance may be increased as the liquid glue in the wheel reservoirs is depleted.

Not previously mentioned is that when properly compressed, the rubber sheet extrudes through the cutouts in the plastic sheet to extend a slightly greater distance from the axis of rotation of the shaft 16 thanariy other part of the wheel structure.

What is claimed is:

1. Rotary glue printing apparatus for printing glue on a blank comprising a rotary shaft and first means for containing a supply of glue and printing glue on a blank as the shaft rotates, said means being mounted on the shaft to rotate therewith and having an interior hollow cavity for containing a supply of glue, and a glue pad having a circumferential glue printing portion to receive glue from said cavity, and a pump mounted on said means radially outwardly of said shaft for pulsating air in the cavity as the shaft rotates to control the flow of glue through said pad.

2. The apparatus of claim 1 furhter characterized in that the pump includes a pump housing mounted by the first means and opening to said cavity and second means mounted by the pump housing adjacent to the cavity for reciprocal movement relative the housing for increasing the air pressure in the cavity as said second means is moved in one direction and decreasing the air pressure in said cavity as the second means is moved in the other direction, and an actuator connected to said second means, and extending exterior of said cavity for reciprocating said second means.

3. Rotary glue printing apparatus for printing glue on a blank comprising a rotary shaft, a frame that rotatably mounts said shaft, first means for containing a supply of glue and printing glue on a blank as the shaft rotates, said first means being mounted on the shaft to rotate therewith and having an interior hollow cavity for containing a supply of glue, and a glue pad having a circumferential glue printing portion to receive glue from said cavity, a pump mounted on said first means for pulsating air in the cavity as the shaft rotates to control the flow of glue through said pad, the first means including a wall portion that in part defines said cavity and mounts said pump, the pump including a pump housing mounted by said wall portion and opening to said cavity, second means mounted by the pump housing adjacent the pump housing opening to the cavity for reciprocal movement relative to the housing for increasing the air pressure in the cavity as said second means is moved in one direction and decreasing the air pressure in said cavity as the second means is moved in the other direction, and an actuator connected to said second means, and extending exterior of said cavity for reciprocating said second means, and operator means on the frame for operating the actuator to move said second means in said one direction as said circumferential portion is adjacent the blank for printing glue thereon and permitting movement in the opposite direction as said circumferential portion moves away from the last mentioned blank.

4. The apparatus of claim 3 further characterized in that the operator means is a cam mounted on the frame and that the actuator includes a cam follower for abutting against the cam as the first means is rotating, and a slide member mounting the cam follower, reciprocally mounted by the pump housing and connected to the second means for moving the second means therewith.

5. The apparatus of claim 3 further characterized in that the housing opening to the cavity comprises a second wall portion defining a cylindrical well that opens to said cavity and that is closed by the second means, that second means comprises a diaphragm having a pcripheral edge portion mounted in a fixed position by said second wall portion and a central portion connected to the actuator to move therewith.

6. The apparatus of claim 3 further characterized in that said housing has means defining a valving chambet, a first bore for fluidly connecting the valving chamber to the ambient atmosphere and a second bore opening to the valving chamber remote from the first bore and providing the housing opening to said cavity, that the actuator slidably extends through said chamber, and that the second means includes valving means mounted within said chamber, and on the actuator to cooperate therewith for forcing pulses of air under pressure through the second bore to the cavity as the actuator is moved in said one direction and draw air into the chamber.

7. The apparatus of claim 6 further characterized in that the valving means comprises a piston mounted on the actuator to divide said chamber into first and second chamber portions, and having a bore therethrough for fluidly connecting said chamber portions, and a reed valve mounted on the piston for blocking the piston bore as the actuator is moved in said one direction and permitting fluid flow therethrough as the actuator is moved in said other direction.

8. Rotary glue printing apparatus for printing glue on a blank comprising a rotary shaft, a frame mounting said shaft, first means for containing a supply of glue and printing glue on a blank as the shaft rotates, said first means being mounted on the shaft to rotate therewith and having an interior hollow cavity for containing a supply of glue, and a glue pad having a circumferential glue printing portion to receive glue from said cavity, and a pump mounted on said first means for pulsating air in the cavity as the shaft rotates to control the flow of glue through said pad, the ,pump including a pump housing defining a pump chamber, a first bore opening to said chamber and to the ambient atmosphere, and a second bore opening to said cavity and to said chamber spaced from the first bore, valve means slidably mounted in the chamber for movement in a first direction to draw air through the first bore into the chamber and force pressurized air through the second bore into the cavity, and an actuator for moving the valve means in the first direction and then in the opposite direction, and control means on the frame for operating said actuator means insaid first direction when said glue printing portion is adjacent said blank.

9. The apparatus of claim 8 further characterized in that said valve means comprises a piston having a bore extending therethrough generally in the direction of the movement ofv the valve means in the pump chamber, said piston dividing said chamber into first and second chamber portions that are of varying capacities as the valve means in moved in the chamber, the first bore opening to the first chamber portion, the second bore opening to the second chamber portion, and a valve member blocking fluid flow through the piston bore as the valve means is moved in the first direction and permitting fluid flow therethrough when the valve means is moved in the opposite direction, the piston blocking the opening of the first bore to the chamber prior to the end of the movement of the valve means in the opposite direction.

10. The apparatus of claim 8 further characterized in that the control means comprises a cam mounted on the frame, that the actuator comprises a cam follower moved by the cam in the first direction as the shaft rotates when said circumferential portion is adjacent the blank and permit the actuator moving in the opposite direction as the said circumferential portion moves away from the blank, and spring means for moving the valve means in the opposite direction as the circumferential portion moves away from the blank.

11. The apparatus of claim 10 further characterized in that the pump housing includes a wall portion defining a well opening to said cavity, and that the pump includes means mounted in said well and connected to the actuator to at least in part move therewith for increasing the air pressure in the cavity as the actuator moves in the first direction and decreasing the air pressure in the cavity as the actuator means in the opposite direction.

12. The apparatus of claim 11 further characterized in that said first means includes a first generally half cylindrical reservoir having the above mentioned cavity, pump and circumferential portion, a second generally half cylindrical reservoir having a hollow second cavity for containing a supply of glue, a second glue pad having a circumferential portion opening to the cavity to receive glue therefrom and print glue on a blank, and a pump pulsating air in the second cavity as the shaft rotates to control the flow of glue through the second pad, and second means for releasably mounting said reservoirs on the shaft to rotate therewith.

1 13. The apparatus of claim 12 further characterized in that each reservoir includes an arcuate, perforated wall portion defining part of the respective cavity and having a circumferential surface portion radially outwardly of the shaft, that each-pad includes an open cell foam rubber sheet on the perforated wall portion in abutting relationship to the radially outwardly surface portion and a flexible plastic mask abutting against the surface of the foam rubber sheet opposite the perforated wall portion and having a cutout of the pattern of glue to be printed on the blank, and that the first means includes tensioning means for retaining the mask in abutting relationship to the plastic mask to sufficiently compress the mask that the portion of the rubber sheet adjacent the cutout bulges out through the cutout to permit passage of glue therethrough and compress the remaining of the rubber sheet sufficiently to block the passage of glue therethrough.

14. The apparatus of claim 13 further characterized in that each reservoir has radially extending, diametrically opposed first and second wall portions that in part define the respective cavity, and that the tensioning means includes for each reservoir, a plurality of axially spaced, elongated straps having one ends attached to the first wall portion of the respective reservoir, and opposite ends, a mounting member mounted on the second wall portion of the respective reservoir, and means releasably mounted on the mounting member and cooperating therewith for mounting the opposite ends of the straps and retaining the straps in tension.

15. The apparatus of claim 14 further characterized in that the second means comprises means for retaining the reservoirs on the shaft with the first wall portion of the first reservoir abutting against the second wall portion of the second reservoir and permitting the first reservoir being removed from the shaft while retaining the second reservoir in mounted relationship to the shaft, and that the cam is mounted on the frame by adjustment means for selectively permitting adjustment of the cam to vary the distance of movement of the actuator in the first direction to control the magnitude of the pulse of air in the cavity.

16. Rotary glue printing apparatus for printing glue or the like on a blank comprising a rotary shaft, a frame mounting said shaft for rotation, first means defining a hollow cavity for containing a supply of glue, said first means being mounted on the shaft to rotate therewith, and including a circumferential glue pad printing portion to receive glue from the cavity for printing glue on the blank in a glue printing position, operable pump means mounted on the first means to rotate therewith and having a discharge port opening to said cavity for introducing air into said cavity and control means mounted on the frame to operate said pump means to introduce air into said cavity as the shaft is rotated.

17. Rotary glue printing apparatus for printing glue or the like on a blank comprising a rotary shaft, a frame mounting the shaft for rotation, first means defining a hollow cavity for containing a supply of glue, said first means being mounted on the shaft to rotate therewith, and including a circumferential glue pad printing portion to receive glue from the cavity and having a circumferential glue printing portion for printing glue on the blank in a glue printing position, a pump mounted on the first means to rotate therewith and having a discharge port opening to said cavity for introducing air into said cavity as the supply of glue in the cavity is depleted, the pump including a housing having a piston chamber, an inlet port opening to said chamber, piston means mounted for movement in the chamber for drawing air through the inlet port into the chamber and forcing air under pressure from the chamber to the discharge port as the piston moves in the chamber, and an actuator connected to the piston means and extending out of the housing for moving the piston in the chamber, and control means at least in part mounted on the frame for operating the actuator to move the piston for forcing a pulse of pressurized air into the cavity for each cycle of rotation of the shaft.

18. The apparatus of'claim 17 further characterized in that the pump includes second means connected to said actuator for being operated thereby for increasing the pressure of the air in the cavity and alternately decreasing the pressure of the air in the cavity, and that the control means comprises means to operate the actuator to move the second means to increase the air pressure in said cavity when said circumferential portion is moving toward and adjacent the glue printing position.

19. The apparatus of claim 18 further characterized in that the control means includes means acting on at least one of the actuators, second means and piston to move the second means to decrease the air pressure in the cavity as said circumferential portion moves away from its glue printing position.

20. The apparatus of claim 19 further characterized in that the circumferential portion includes a mask portion having a cutout and a glue impervious part surrounding the cutout, a mounting member defining a part of the cavity and having perforations therethrough to permit passage of glue therethrough toward the mask portion, and a compressible, glue pervious portion between the mask portion and mounting member that is retained in sufficient compression by the mask portion to block passage of glue therethrough other than adjacent the cutout, and third means for releasably retaining the mask in a condition to compress the compressible portion.

21. Apparatus for printing glue or the like on a blank comprising wall first means defining a cavity for holding a supply of glue, said wall means having a wall portion that partially defines said cavity and has an exterior surface, a plurality of perforations opening through the exterior surface and to said cavity, and opposite edge portions, an open cell compressible sheet that is pervious to glue in a substantially uncompressed condition, and in a sufficiently compressed condition, substantially impervious to glue, covering said wall portion, a mask made of a material impervious to glue covering and abutting against the'surface of said sheet opposite said wall portion, said mask having at least one cutout for the compressible sheet to extrude through in about the shape ofa glue print to be made on the blank, and second means mounting the mask to compress the compressible sheet between the mask and wall portion, the second means comprising a plurality of elongated straps that each has a first end and a second end, third means for attaching the first ends to one of the wall means edge portions, and releasably tensioning means attaching the second ends to the other edge portion for retaining the straps in tension to hold the mask in compressing relationship to the compressible sheet.

22. The apparatus of claim 21 further characterized in that the tensioning means includes a shaft, a curved member mounted on the shaft to pivot therewith and having the second end of one of the straps secured thereto, a lever connected to at least one of the shaft and the curved member for pivoting the curved memher, and fourth means connected to the wall means other edge portion for mounting the shaft for pivotal movement to upon pivoting the shaft in one direction tension the one strap, and in the other direction-release the tension in the one strap, and fifth means on the fourth means for releasably retaining the lever in a pivoted position that the curved member holds the one strap connected to it in tension.

23. The apparatus of claim 22 further characterized in that said wall portion exterior surface comprises a circumferentially curved outer surface, that said edge portions are axially extending edge portions, and that the straps are axially spaced relative to the circumferential outer surface.

24. The apparatus of claim 23 further characterized in that the fourth means comprises a shaft mount having shaft mounting slots that permit the shaft being manually slipped therein.

25. The apparatus of claim 23 further characterized in that there is provided a drivable shaft, and sixth means for mounting the first means on the drivable shaft to rotate therewith, that the fourth means includes seventh means joined to said wall portion to form a chamber opening generally radially outwardly relative the drivable shaft and eighth means for mounting the first mentioned shaft in chamber, said eighth means being mounted by the seventh means, and that there is provided clamp means for releasably attaching the mask and compressible sheet to the wall portion.

26. The apparatus of claim 23 further characterized in that there is provided means defining a second cavity for holding a supply of glue, said second cavity means having a wall portion that has a circumferentially curved outer surface of the same radius of curvature as the first mentioned circumferentially curved outer surface, a second compressible sheet, a second mask having a cutout and means mounting the second compressible sheet between the second mask and the second cavity means circumferentially curved surface to compress the second compressible sheet, a drivable shaft, and sixth means mounting the first means and the second cavity means on the drivable shaft in angularly aligned relation to the first means for selective separable removement from said drivable shaft.

27. The apparatus of claim 26 further characterized in that the first means and the second cavity means have axially extending wall portions defining a part of the respective cavity and that are retained in abutting relationship by the sixth means, the last mentioned wall portions extending generally radially outwardly of the drivable shaft.

28. The apparatus of claim 27 further characterized in that there is provided a pair of operable pulsible means respectively mounted on the first means and the second cavity means for pulsating air in the respective cavity as the drivable shaft is rotated and control means for operating the pulsible means as the drivable shaft is rotated.

29. The apparatus of claim 28 further characterized in that the pulsible means each includes means for increasing the air pressure in the respective cavity as the first means and second cavity means are respectively moved angularly adjacent the blank that glue contained therein is to be printed on, and thereafter decreasing the air pressure in the respective cavity.

30. The apparatus of claim 28 further characterized in that each pulsible means includes means for introducing a pulse of air under pressure into the respective cavity from the ambient atmosphere.

31. Rotary glue printing apparatus for printing glue on a blank comprising a drivable shaft, first means defining a first cavity for containing a supply of glue. second means defining a second cavity for containing a separate second supply of glue. each of the first and second means having a circumferential wall portion of the same radius of curvature as the other and of substantially the same axial length, each circumferential wall portion having perforations extending therethrough to open to the respective cavity, and a generally axially and radially extending wall portion, said wall portions enclosing parts of the respective cavity, third means for mounting the first and second means on the shaft to rotate therewith with the radially and axially extending wall portions angularly aligned, and permitting separate removal of the first and second means from the shaft, a glue pad for each of the first and second means, and fourth means for mounting the glue pads on the first and second means respectively.

32. The apparatus of claim 31 further characterized in that the third means mounts said first and second means on the shaft with the radially and axially extending wall portions in abutting relationship.

33. Rotary glue printing apparatus for printing glue on a blank comprising a drivable shaft, first means defining a first cavity for containing a supply of glue, second means defining a second cavity for containing a separate second supply of glue, each of the first and second means having a circumferential wall portion of the same radius of curvature as the other and of substantially the same axial length, each circumferential wall portion having perforations extending therethrough to open to the respective cavity, and a generally axially and radially extending wall portion, said wall portions enclosing parts of the respective cavity, third means for mounting the first and second means on the shaft to rotate therewith with the radially and axially extending wall portions angularly aligned, and permitting separate removal, a glue pad for each of the first and second means, and fourth means for mounting the glue pads on the first and second means respectively, the third means comprising an axially elongated annular hub having a central cylindrical outer surface portion, a first end portion having an annular surface adjacent the cylindrical surface that is of a larger outer diameter than the cylindrical outer surface portion and a second end portion having a frusto-conical surface portion tapered radially outwardly in an axial direction toward the first end portion, of a larger diameter than the cylindrical outer surface portion, and extending in overlapping relationship to the cylindrical surface portion, each of the circumferential wall portions having a tapered curved surface end portion extendable between the frusto-conical surface portion and the cylindrical surface portion, and an opposite end portion, and fifth means for each of the first and second means for clamping the respective last mentioned end portion against the cylindrical surface portion and retaining the tapered curved surface portion between the frustoconical surface portion and the cylindrical surface portion, the fifth means being mounted on the hub first end portion.

34. Rotary glue printing apparatus for printing glue on a blank comprising a drivable shaft, first means defining a first cavity for containing a supply of glue, second means defining a second cavity for containing a separate second supply of glue, each of the first and second means having a circumferential wall portion of the same radius of curvature as the other and of substantially the same axial length, each circumferential wall portion having perforations extending therethrough to open to the respective cavity, and a generally axially and radially extending wall portion, said wall portions enclosing parts of the respective cavity, third means for mounting the first and second means on the shaft to rotate therewith with the radially and axially extending wall portions angularly aligned, and permitting separate removal, a glue pad for each of the first and second means, and fourth means for mounting the glue pads on the first and second means respectively, each of the glue pads comprising a compressible sheet that in an uncompressed condition permits the passage of glue and in a compressed condition blocks the passage of glue therethrough, and a stiff flexible mask made of a material impervious to glue, said compressible sheet being between the respective mask and circumferential wall portion, said mask having at least one cutout of the general shape of the pattern of glue to be printed on the blank, and the fourth means including quick release tensioning means for abutting against the mask to retain the compressible sheet other than juxtaposition the cutouts in a sufficiently compressed condition to prevent the passage of glue therethrough.

35. The apparatus of claim 34 further characterized in that each circumferential portion has a first axial extending edge in that the first and second means each has means defining a radially outwardly opening, recessed chamber adjacent the first axially extending edge of the respective circumferential wall portion, that each of the quick release means includes a plurality of elongated, narrow straps having first ends and second ends, means for securing the first ends to respective one of the first and second means remote from the respective first circumferential axially extending edge, a curved tightening member having a pivot shaft attached to each of the strap second ends, said first and second means having slotted portions having slots for slidably receiving the pivot shafts for mounting the curved members in the chambers to pivot about axes parallel to the drivable shaft to wind strap portions on the curved members, each curved member having a lever, and spring means mounted in each ofthe chambers for manually releasably retaining the levers in a position to hold the curved members in a pivoted position that the strap portions are in a wound condition to retain the straps in a tensioned condition.

36. Rotary glue printing apparatus for printing glue on a blank comprising a rotary shaft, first means mounted on the shaft to rotate therewith for containing a supply of glue and printing glue on the blank as the shaft rotates, said first means having a circumferented wall portion, opposite end wall portions and second means joined to the above mentioned wall portions'to form a chamber recessed relative the circumferential portion and opening radially outwardly relative the shaft, the above mentioned wall portions and second means at least in part defining a cavity for containing the supply of glue, said circumferential wall portion having a radially exterior surface and a plurality of apertures opening therethrough and to said cavity. a glue pad removably mounted on said circumferential wall portion to abut against'said surface, a plurality of elongated, narrow straps have first and second ends extendable over the pad in axial spaced relationship for holding the pad against the circumferential wall portion, third means for attaching the straps first ends to the first means remote from said chamber, and cooperating quick release fourth means mounted in said chamber and attached to the straps second ends for selectively tensioning said straps for holding the glue pad against said circumferential wall portion.

37. The apparatus of claim 36 further characterized in that thequick release means includes a curved member for each strap, a pivot shaft and lever connected to each curved member for pivotally mounting the curved member and pivoting the curved member to wind the respective strap on the curved member, slotted mounting portions for mounting the pivot shafts, and spring means mounted by the second means for abutting against the levers for releasably abutting against the levers to retain the curved members in strap tensioning positions when the pivot shafts are mounted by the slotted portions.

38. The apparatus of claim 37 further characterized in that the glue pad comprisesa compressible sheet that in an uncompressed condition is pervious to glue and when compressed is impervious to glue, and a mask that is impervious to glue and having at least one cutout for the compressible sheet to extrude through, said compressible sheet being between the mask and the circumferential wall portion, the straps in a tensioned condition abutting against the mask to compress the compressible sheet to block the passage of glue, other than at each cutout provided.

39. The apparatus of claim 38 further characterized in that one of the end wall portions mounts pump means for introducing a pulse of air from exterior of the cavity into the cavity for each rotation of the shaft and also increase the air pressure in the cavity as the cutout is moved angularly adjacent a blank glue printing position and decrease the air pressure in the cavity as the cutout moves angularly away from the blank glue printing position.

40. The apparatus of claim 38 further characterized in that the first means includes a pair of diametric opposed wall portions that in part define said cavity, and that a second first means is mounted on said shaft and has wall portions abutting against the above mentioned diametrically opposed wall portions, and a glue printing pad mounted on the second first means that receives glue from the second first means.

Claims

5. The apparatus of claim 3 further characterized in that the housing opening to the cavity comprises a second wall portion defining a cylindrical well that opens to said cavity and that is closed by the second means, that second means comprises a diaphragm having a peripheral edge portion mounted in a fixed position by said second wall portion and a central portIon connected to the actuator to move therewith.

6. The apparatus of claim 3 further characterized in that said housing has means defining a valving chamber, a first bore for fluidly connecting the valving chamber to the ambient atmosphere and a second bore opening to the valving chamber remote from the first bore and providing the housing opening to said cavity, that the actuator slidably extends through said chamber, and that the second means includes valving means mounted within said chamber, and on the actuator to cooperate therewith for forcing pulses of air under pressure through the second bore to the cavity as the actuator is moved in said one direction and draw air into the chamber.

8. Rotary glue printing apparatus for printing glue on a blank comprising a rotary shaft, a frame mounting said shaft, first means for containing a supply of glue and printing glue on a blank as the shaft rotates, said first means being mounted on the shaft to rotate therewith and having an interior hollow cavity for containing a supply of glue, and a glue pad having a circumferential glue printing portion to receive glue from said cavity, and a pump mounted on said first means for pulsating air in the cavity as the shaft rotates to control the flow of glue through said pad, the pump including a pump housing defining a pump chamber, a first bore opening to said chamber and to the ambient atmosphere, and a second bore opening to said cavity and to said chamber spaced from the first bore, valve means slidably mounted in the chamber for movement in a first direction to draw air through the first bore into the chamber and force pressurized air through the second bore into the cavity, and an actuator for moving the valve means in the first direction and then in the opposite direction, and control means on the frame for operating said actuator means in said first direction when said glue printing portion is adjacent said blank.

9. The apparatus of claim 8 further characterized in that said valve means comprises a piston having a bore extending therethrough generally in the direction of the movement of the valve means in the pump chamber, said piston dividing said chamber into first and second chamber portions that are of varying capacities as the valve means in moved in the chamber, the first bore opening to the first chamber portion, the second bore opening to the second chamber portion, and a valve member blocking fluid flow through the piston bore as the valve means is moved in the first direction and permitting fluid flow therethrough when the valve means is moved in the opposite direction, the piston blocking the opening of the first bore to the chamber prior to the end of the movement of the valve means in the opposite direction.

13. The apparatus of claim 12 further characterized in that each reservoir includes an arcuate, perforated wall portion defining part of the respective cavity and having a circumferential surface portion radially outwardly of the shaft, that each pad includes an open cell foam rubber sheet on the perforated wall portion in abutting relationship to the radially outwardly surface portion and a flexible plastic mask abutting against the surface of the foam rubber sheet opposite the perforated wall portion and having a cutout of the pattern of glue to be printed on the blank, and that the first means includes tensioning means for retaining the mask in abutting relationship to the plastic mask to sufficiently compress the mask that the portion of the rubber sheet adjacent the cutout bulges out through the cutout to permit passage of glue therethrough and compress the remaining of the rubber sheet sufficiently to block the passage of glue therethrough.

18. The apparatus of claim 17 further characterized in that the pump includes second means connected to said actuator for being operated thereby for increasing the pressure of the air in the cavity and alternately decreasing the pressure of the air in the cavity, and that the control means comprises means to operate the actuator to move the second means to increase the air pressure in said cavity when said circumferential portion is moving toward and adjacent the glue printing position.

21. Apparatus for printing glue or the like on a blank comprising wall first means defining a cavity for holding a supply of glue, said wall means having a wall portion that partially defines said cavity and has an exterior surface, a plurality of perforations opening through the exterior surface and to said cavity, and opposite edge portions, an open cell compressible sheet that is pervious to glue in a substantially uncompressed condition, and in a sufficiently compressed condition, substantially impervious to glue, covering said wall portion, a mask made of a material impervious to glue covering and abutting against the surface of said sheet opposite said wall portion, said mask having at least one cutout for the compressible sheet to extrude through in about the shape of a glue print to be made on the blank, and second means mounting the mask to compress the compressible sheet between the mask and wall portion, the second means comprising a plurality of elongated straps that each has a first end and a second end, third means for attaching the first ends to one of the wall means edge portions, and releasably tensioning means attaching the second ends to the other edge portion for retaining the straps in tension to hold the mask in compressing relationship to the compressible sheet.

22. The apparatus of claim 21 further characterized in that the tensioning means includes a shaft, a curved member mounted on the shaft to pivot therewith and having the second end of one of the straps secured thereto, a lever connected to at least one of the shaft and thE curved member for pivoting the curved member, and fourth means connected to the wall means other edge portion for mounting the shaft for pivotal movement to upon pivoting the shaft in one direction tension the one strap, and in the other direction release the tension in the one strap, and fifth means on the fourth means for releasably retaining the lever in a pivoted position that the curved member holds the one strap connected to it in tension.

31. Rotary glue printing apparatus for printing glue on a blank comprising a drivable shaft, first means defining a first cavity for containing a supply of glue, second means defining a second cavity for containing a separate second supply of glue, each of the first and second means having a circumferential wall portion of the same radius of curvature as the other and of substantially the same axial length, each circumferential wall portion having perforations extending therethroUgh to open to the respective cavity, and a generally axially and radially extending wall portion, said wall portions enclosing parts of the respective cavity, third means for mounting the first and second means on the shaft to rotate therewith with the radially and axially extending wall portions angularly aligned, and permitting separate removal of the first and second means from the shaft, a glue pad for each of the first and second means, and fourth means for mounting the glue pads on the first and second means respectively.

33. Rotary glue printing apparatus for printing glue on a blank comprising a drivable shaft, first means defining a first cavity for containing a supply of glue, second means defining a second cavity for containing a separate second supply of glue, each of the first and second means having a circumferential wall portion of the same radius of curvature as the other and of substantially the same axial length, each circumferential wall portion having perforations extending therethrough to open to the respective cavity, and a generally axially and radially extending wall portion, said wall portions enclosing parts of the respective cavity, third means for mounting the first and second means on the shaft to rotate therewith with the radially and axially extending wall portions angularly aligned, and permitting separate removal, a glue pad for each of the first and second means, and fourth means for mounting the glue pads on the first and second means respectively, the third means comprising an axially elongated annular hub having a central cylindrical outer surface portion, a first end portion having an annular surface adjacent the cylindrical surface that is of a larger outer diameter than the cylindrical outer surface portion and a second end portion having a frusto-conical surface portion tapered radially outwardly in an axial direction toward the first end portion, of a larger diameter than the cylindrical outer surface portion, and extending in overlapping relationship to the cylindrical surface portion, each of the circumferential wall portions having a tapered curved surface end portion extendable between the frusto-conical surface portion and the cylindrical surface portion, and an opposite end portion, and fifth means for each of the first and second means for clamping the respective last mentioned end portion against the cylindrical surface portion and retaining the tapered curved surface portion between the frusto-conical surface portion and the cylindrical surface portion, the fifth means being mounted on the hub first end portion.

35. The apparatus of claim 34 further characterized in that each circumferential portion has a first axial extending edge in that the first and second means each has means defining a radially outwardly opening, recessed chamber adjacent the first axially extending edge of the respective circumferential wall portion, that each of the quick release means includes a plurality of elongated, narrow straps having first ends and second ends, means for securing the first ends to respective one of the first and second means remote from the respective first circumferential axially extending edge, a curved tightening member having a pivot shaft attached to each of the strap second ends, said first and second means having slotted portions having slots for slidably receiving the pivot shafts for mounting the curved members in the chambers to pivot about axes parallel to the drivable shaft to wind strap portions on the curved members, each curved member having a lever, and spring means mounted in each of the chambers for manually releasably retaining the levers in a position to hold the curved members in a pivoted position that the strap portions are in a wound condition to retain the straps in a tensioned condition.

36. Rotary glue printing apparatus for printing glue on a blank comprising a rotary shaft, first means mounted on the shaft to rotate therewith for containing a supply of glue and printing glue on the blank as the shaft rotates, said first means having a circumferented wall portion, opposite end wall portions and second means joined to the above mentioned wall portions to form a chamber recessed relative the circumferential portion and opening radially outwardly relative the shaft, the above mentioned wall portions and second means at least in part defining a cavity for containing the supply of glue, said circumferential wall portion having a radially exterior surface and a plurality of apertures opening therethrough and to said cavity, a glue pad removably mounted on said circumferential wall portion to abut against said surface, a plurality of elongated, narrow straps have first and second ends extendable over the pad in axial spaced relationship for holding the pad against the circumferential wall portion, third means for attaching the straps first ends to the first means remote from said chamber, and cooperating quick release fourth means mounted in said chamber and attached to the straps second ends for selectively tensioning said straps for holding the glue pad against said circumferential wall portion.

37. The apparatus of claim 36 further characterized in that the quick release means includes a curved member for each strap, a pivot shaft and lever connected to each curved member for pivotally mounting the curved member and pivoting the curved member to wind the respective strap on the curved member, slotted mounting portions for mounting the pivot shafts, and spring means mounted by the second means for abutting against the levers for releasably abutting against the levers to retain the curved members in strap tensioning positions when the pivot shafts are mounted by the slotted portions.

38. The apparatus of claim 37 further characterized in that the glue pad comprises a compressible sheet that in an uncompressed condition is pervious to glue and when compressed is impervious to glue, and a mask that is impervious to glue and having at least one cutout for the compressible sheet to extrude through, said compressible sheet being between the mask and the circumferential wall portion, the straps in a tensioned condition abutting against the mask to compress the compressible sheet to block the passage of glue, other than at each cutout provided.