US2778530A - Impact extruder for jet of adhesive - Google Patents

Description

4 Shets-Sheet l I Jan. 22, 1957 F. s. SILLARS IMPACT EXTRUDER FOR JET OF ADHESIVE Filed June 1, 195;

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IMPACT EXTRUDER FOR JET OF ADHESIVE Filed June 1, i955 4 Sheets-Sheet 2 [nvenzor BQJer-ic/rSSi/[ars B] is A drr tej 'jmzz, 1951 Es, QLLARS 2,778,530

IMPACT EXTRUDER FOR JET OF ADHESIVE Filed June 1, 1953 4 Sheets-Sheet 5 2 Inve n ldr Euler-MA $.Si/[ars is A 'iorney Jan. 22, 1957 F. SILLARS IMPACT EXTRUDER FOR JET, OF ADHESIVE 4 Sheets-Sheet 4 Filed June 1, 1953 5 is Affdrn United States Patent IMPACT EXTRUDER FOR JET 0F ADHESIVE Frederick S. Sillars, Beverly, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. 5., a corporation of New Jersey Application June 1, 1953, Serial No. 358,809

12 Claims. (Cl. 22270) This invention relates to impact apparatus for ejecting thermoplastic adhesives in a high velocity jet to pass the adhesive through the unbroken or solid outer surface of one of the superposed layers of preassembled parts.

The method by which it is possible to thus bond layers of material is more fully described and claimed in a copending application of myself and Henry C. Pavian, deceased, Serial No. 359,982, filed June 1, 1953.

The handling of hot melt or thermoplastic adhesives which are applied in a molten condition is difficult because of the deterioration of some materials, depending upon their composition, when subjected to heat over a considerable period. These difiiculties arise particularly when it is necessary to maintain the container for a supply of adhesive material at a high temperature sufficient to insure a molten condition of the material after it has passed through guiding and ejecting apparatus. If such material does become overheated it hardens and sticks to the container in such a way that it is a long and difficult operation to remove it.

Further difliculties with such materials are introduced when it is needed to eject the material through a very fine aperture in the nozzle at a velocity such that it will penetrate the upper layer of parts to be bonded through its unbroken surface without leaving any substantial mark thereon and in avoiding a seriously decreased velocity of the jet either at its inception or at its termination with the consequent dribble which would tend to disfigure the work. For such a use where it is desired to deliver cement at the interface between work layers held firmly together, a range of nozzle openings from 12 thousandths to 40 thousandths of an inch is convenient and the molten cement may readily be caused to emerge from these orifices at a speed of 800 to 2000 or more feet per second.

An object of the invention is the provision of improved apparatus for carrying out the method. In accordance with a feature of the invention, the apparatus comprises a nozzle having one or more minute openings, a nozzle holder having an adhesive receiving chamber, a nozzle piston slidably fitting that chamber, and a hammer for striking a sharp blow against the piston to accelerate it and cause the emergence of adhesive in the form of a high velocity jet of very small diameter.

Conveniently, a compressed spring may be utilized for driving the hammer against the piston. As herein illustrated, the spring is associated with power-operated means for compressing and then releasing the force of the spring.

In view of the need to keep the adhesive at an elevated temperature so that it will be sufiiciently fluid to permit proper operation of the apparatus, the latter is arranged so that the supply of adhesive is maintained at a moderate temperature and is removed in small quantities to a nozzle chamber which is heated to a considerably higher temperature. In accordance with another feature of the invention, automatic means for supplying charges of cement to the nozzle chamber are provided so that repeated operations of the machine may occur in quick succession. This apparatus, as herein illustrated, utilizes the piston itself as a valve for controlling the flow of adhesive from the source of supply to the nozzle chamber and is arranged to impart a partial rotation to the piston and to lift it away from the nozzle to provide a suitable space for the reception of the adhesive material which is to be ejected.

These and other features of the invention will best be understood by consideration of the following specification, taken in connection with the accompanying drawings in which:

Fig. l is a side elevation, with parts broken away and in section, of the head of the apparatus;

Fig. 2 is a plan view thereof;

Fig. 3 is a transverse vertical section near the front of the apparatus on the line IIIIII of Fig. 2;

Fig. 4 is a vertical section on a greatly enlarged scale through an insole on a last and showing the cement which has been applied at one spot by the apparatus;

Fig. 5 is an angular view of an insole attached to a last by the use of the apparatus;

Fig. 6 is a vertical section on line Vl-Vl of Fig. 2;

Fig. 7 is a vertical section on an enlarged scale through the nozzle taken on the same plane as Fig. 3;

Fig. 8 is a horizontal section on the line VIIIVIII of Fig. 7 looking down on a cam-adjusting lever;

Fig. 9 is a section greatly enlarged, through cement applied to an upper overlasted upon an insole; and

Fig. 10 is an angular view of the cam-adjusting lever.

A large number of instances will readily occur to the reader where the apparatus may be profitably employed in doing work of various types. One of these is illustrated in Figs. 4 and 5 Where the apparatus is employed for attaching an insole to a last to hold it in its proper location thereon temporarily during the assembly of a shoe upper upon the last, the pulling over and the lasting operations. This has commonly been done by means of driven fastenings such as tacks, but when such fastenings have been employed the last became worn so that the tacks did not hold and the subsequent removal of the tacks prior to the bottoming of the shoe has constituted an extra operation. This has been an added expense in itself and has involved numerous difiiculties such as the disposal of the used tacks, possible damage to the insole flat sheet is positioned manually upon a last L and bent Y to correspond to the curvature of the last bottom. While. held together in this condition, the exposed, unbroken surface of the insole is presented to the nozzle of the machine. The insole is then secured to the last at a number of spots S varying from three to six or more according to what is necessary in order to keep the insole conformed to both the longitudinal and the transverse curvatures of the bottom of the last by moving the work laterally to present it to the nozzle at various points on the insole. Happily, the same general system as has been customary, when using tacks, may be employed when the securing means is a hot-melt adhesive which is driven at high velocity through the unbroken outer surface of the insole and,

having passed through the whole thickness thereof, is

dispersed on the interface between the insole and the last. There the material almost instantaneously chills or freezes forming a bond of entirely adequate strength to hold the insole in place during the shoemaking operations which follow. It is found that the subsequent removal of the last from the substantially completed shoe offers no difficulties and no undue or added effort is required to move it in a direction making a sharp or low angle with the bottom of the last. Perhaps this is due to the brittle 3. ness ofthe-materials employed or'it may be affected by subsequent shoemaking operations, such as the treatment of the shoe in a leveling machine, but in any event it can readily be controlled by a'proper choice of the composition of the hot-melt adhesive or, in the case of some unusual factor, by a previous treatment of the bottom surface of the last. Experience teaches, however, that such a treatment will seldom be necessary.

It will be readily understood that differences in the openstructured, fibrous materials through which the adhesive is injected and variations in the viscosity of the adhesive material to be injected will require slight differences in.

the size of the jet of molten material and in the pressure which is applied thereto. Concomitantly, materials of different viscosity may require diiferent temperatures to bring the material to the best condition for injection. These factors, however, are only such as would be encountered in any use of thermoplastic adhesives and an examination of the resultant structure of the hardened adhesive, after it has been introduced, shows that it consists chiefly of a stem-like portion T which is integral with an enlarged head portion H spreading out at the interface. While it is possible to cause such a jet of material to penetrate. even thin metals and to enter dense hard Woods for a substantial fraction of an inch when applied directly thereto, there is always a spreading of the cement at the interface. This may be due to a difference in the densities of the two materials through one of which it is passing or it may result from the inherent lack of resistance to lateral spreading at the interface because of the fact that no substantial pressure is being applied to hold the two layers together. A close examination under the microscope shows that the jet as it progresses tends to seek out the path of least resistance and to form minute branches among the fibres of the material. That action seems to be of less importance when the density of the material through which the jet passes is low with the consequence that the stem T of the injected material remains substantially uniform over short distances.

When, in the practice of the method, the work comprises a plurality of thin layers of material there will be variations in the resulting structure of the bond. One. such isillustrated at Fig. 9 where an insole I upon a last L has been associated with a shoe upper U and various lining or doubling materials D which are overlasted on the bottom of the insole. The injection of material accordingto the method then results in a continuous stem T extendingv through the layers U and D and partially penetrating the insole I. At the same time, lateral dispersion of mate ials at the interfaces will result in the formation of enlarged portions H, H at the interfaces. By applying a series of such spots S along the margin of the shoe,.the fastenings for a progressive lasting operation are provided.

A common denominator of these applications ofadhesivelies in the fact that injections aremade through.

the unbroken surface ofthe material in jets whichhave a diameter of a few thousandths of an inch such as .012. to .040 of an inch. As a consequence the appearance of the outer surface of the work is changed but little. in some cases the cement appears as small dots on the surface and in other cases, it almost; disappears among thefibres of the work.

Various sorts of adhesive may be employed and it'has' 1), in a manner which will be explained b'elow,.having' reached itthrough a piston passage lfiem'erging at'its upper endin a'vertical'recess 26in theperipheral'surface of a piston-22. The-upper end of this piston-itrectangularat 24 and, for reasons which will later appear, is provided with lateral lugs 26 (Fig. 10) each rounded on one side.

The piston 22 slides vertically in the upper part of the chamber 16 in a heated nozzle holder 28 which it attached to the underside of a framefifl-(Fig. l) by screws 32 and the transfer of heat to the frame is reduced to a minimum by the interposition of asheet of insulating material 34;

This nozzle holder 28 is keptat the desired temperatureby one or more heating. units 36-under the control of a thermostat (not shown) and it has a horizontal inletpassage 38 (Fig. 7) reduced in size at its inner endand positioned to deliver the adhesive'to the chamber 16 through the peripheral recess 20 of? the piston 22 when this is brought in register with the passage.

The delivery of adhesive to the passage 38 is through a connector 49 (Fig. 3) which is supported upon the bottom of a receptacle 42 (Fig. 6) by means ofscrews 44,

after having passed through an opening 46 (Fig. 3)in the frame 30. The receptacle 42, attached to the frame 30 by means of screws 47, is separated from the frame by. a sheet of insulation 48. The receptacle has an. adhesive receiving chamber 50 and is maintained at the desired temperature by a series of heating units 52, 54 controlled by a thermostat 56. This chamber is provided with a displaceable cover 58. In the case of one particular adhesivethe receptacle is maintained at a temperature of 275 while the nozzle 10 is heated to 350. This avoids the overheating of the quantity of adhesive in the receptacle and at the same time maintains the nozzle at a temperature such that the desired degree of fluidity is reached to enable easy ejection thereof.

Interposed between the receptacle chamber 50 and the connector 40 is a pump comprising a horizontal passage (Fig. 6) in which a pump plunger 62 reciprocates. This passage 60 isconnected with the chamber 50 by an outlet opening 64 and opens into the connector 40 through a vertical passage 66 in the receptacle 42. A by-pass between the pump passage 60 and the chamber 50 comprises a vertical passage 68 which is normally kept closed by a ball valve '70 held down by a spring 72the tension of which may be adjusted by means of a screw 74. It also comprises a horizontal passage 76 leading into the chamber 50.

The turning of the nozzle piston 22, to bring the recess 20 therein into alinement with the passage 38 leading from the pump, is effected by a horizontal lever. 80. having a square opening 82 which fits loosely around the square portion 24 of the nozzle piston. The end of the lever in which the opening 82 is made is also providedwith a recessed'portion 84'to provide room for a two-element cam projecting up from an enlarged end86 of ahandle 88 which may be secured in adjusted position by means of a clamp screw 90 extending down through a slot 92 in the nozzle holder 28. The bottom of the recessed portionof the lever 80 rests on the rim of the enlarged end 86.0f the handle 88 andcauses the oscillation of the lever to take place at a fixed level.

in this enlarged portion of the handle. there is provided a vertical passage 94 permitting free verticalmovement of the nozzle piston 22 and the handle has diametrically opposite cam surfaces 96, 98' (Figs. 8 and 10) up which the lugs 2'6'rideso that. when the lateral recess 20 of the nozzle piston is brought into alinement with the passage 38 the lugs 26 will rideup on the cam surfaces and lift the piston 22 to provide the chamber 16 just above the nozzle 10. This chamber may be adjusted as to volume by adjustment of the handle 88 and issized to contain only as much as is needed for a single ejection since an excess amount might interfere with the velocity-of the jet because of a slight compressibility of the adhesive. The viscosity of the cement is such that there is substantially no flow of the adhesive in the passage the nozzle until it is pushed throughitby a. blow on. the upper end:

of the" piston 22. When this occurs, the piston 22 will be floating on the adhesive in the chamber 16 and will have been turned back so that the lugs 26 are displaced from the cam surfaces 96, 9S and are above level portions 100 of the enlarged end 86.

A blow, on the projection 102 (Fig. 7) at the top of the nozzle piston 22 to eject the cement through the opening 14 of the nozzle at high velocity, will be administered with almost explosive force by means of a hammer 104 (Figs. -1 and 3) which is guided for vertical movement in a slotted tube 106 having a bottom flange 108 which, by means of screws 110, is secured tothe upper surface of the frame 30. The hammer also has a transverse pin 112 extending through the slots of the tube 106 and by means of which it is lifted, thereby compressing a spring 114 which is contained within the tube 106. The degree of compression of the spring 114 is regulated hv means of a hand screw 116 threaded in a cap 118 and held in adjusted position by a locknut 120. p

A mechanism for operating the pump plunger 62, turning the piston 22 and lifting the hammer 104' is operated mechanically by the power of a motor 122. This is mounted on a shelf 124 which is joined to the frame 30 by means of a vertical flange 126 and a front-to-back fence-like flange 128 (Fig. 2). The frame as a whole is supported upon a suitable pedestal 130 at the bottom of which is a treadle (not shown) connected by atreadle rod 132 (Fig. l) to a bell crank 134 operating an actuator 136 of a clutch 138 of any suitable construction. The clutch is mounted on a transverse horizontal shaft 140 (Fig. 2) carried in bearings 142, 144 and driven fromthe motor 122 by sprockets and a chain 146. Blocks for these bearings 142, 144 are mounted on the frame shelf 124 and substantially in alinement with them is a crank 150 carried in bearings 152 and joined to the driven portion of the clutch 138 by means of a flexible connector 154. The power of the crank 150 is utilized for lifting the hammer by connecting the crank through an adjustable connecting rod 156 (Fig. 1) to a walking beam 160 pinned to a shaft 162 which is supported in bearings formed in flanges 164 of a block 166 secured by screws to the frame 30.

The walking beam 160 comprises two side bars which are interconnected by cross pieces 168, 170. In the forward end of this walking beam are pivot pins 172 on which are hung catches in the form of pivoted hooks 174 (Fig. l) interconnected by a cross flange 176 and having notches the bottom surfaces of which slope slightly up for a purpose to be described later. The hooks are pulled rearwardly by a spring 178 tensioned between the flange 176 and a pin 180 on the beam. If, then, the beam starts in an upper position and the forward end descends, the hooks will snap over the cross pin 112 which protrudes through the .slots of the tube 106. Then, as the beam tilts so that the forward end rises again, it will carry with it the hammer compressing the spring 114 until, at the .upper end of its range of movement, the rear ends of the interconnected hooks 174 engage the lower ends of stop pins 182 (Figs. 1 and 3) adjustably mounted in a bracket 184 attached to the guide tube 106. At this time, the hooks 174 are withdrawn from the cross pin 112 of the hammer against the tension of the spring 178 and the hammer is forced violently down until it hits the projection 102 at the top of the piston, thus ejecting the fluid in the chamber 16 through the nozzle.

A reciprocation of the pump plunger 62 (Fig, 6) is effected from the same cross shaft 162 by a crank arm 190 pinned to the shaft 162 at its left end (Fig. 2). This arm carries a roll 192 engaging a groove 194 in a bell crank 196 (Fig. 6) carried between lugs of a block 198 secured to the rear face of the receptacle 42. The lower forward end of the bell crank 196 is forked and provided with pins 200 received between the flanges of a grooved collar 202 secured to the pump plunger 62.

A mechanism for operating the arm 80 imparts a partial 6. rotation to the nozzle piston 22 so that it will act as a valve and comprises an arm 204 (Figs. 1 and 3) which is loose on the end of the shaft 162 and is connected at its lower end by means of anadjustable rod 206 to an oscillatory lever 208 carried by a pin 210 mounted in a lug 212 (Figs. Zand 3) which is integral with the forward portion of the fence-like flange 128. The lower end of this lever 208 is connected to the arm 80, which rotates the nozzle piston, by means of a connecting rod 214 which is joined to said arm and to the lever 208 by ball joints. The range of the movement of the lever 208 as it turns the lever 80 to the rear is limited by a stop 236 threaded in a block 238 which is attached to the frame 30 beside the bearing 166.

An intermittent movement is imparted to this arm 204 by means of an arm 220 pinned to the shaft 162 and connected to the arm 204 by a torque spring 222 (Fig. 3). The arrangement of this spring is such that it tends to turn the arm 204 (Fig. l) clockwise and to move the rod 206 to the left. It should be noted that, in addition to this impositive connection, the lower end of the arm 220 has mounted upon it a latch 224 which is pivoted on said arm and is held against the extension of a pin 226, which joins the arm 204 and the rod 206, by a spring 228 connected to a tail on the latch and to a stud 230 on a bracket 232 attached to the frame 30. This bracket also has an adjustable stop screw 234 in line with the lower end of the latch 224. Consequently, when the arm 220 moves counterclockwise as viewed in Fig. 1, assuming that the latch 224 has previously engaged the pin 226, the arm 204 will be moved counterclockwise until the tail of the latch 224 engages the stop pin 234. Thereupon, the arm 204 will be released and the lever 208 rotated counterclockwise by the spring 222 to pull the lever 80 to the rear, as viewed in Figs. 1 and 2.

The superposed, contiguous layers of work are first presented to the nozzle 10 or are brought close to it and the treadle attached to the treadle rod 132 is depressed, whereupon the sequence of operation of these mechanism proceeds from a starting point, determined by the actuator 136 of the clutch 138, at which the forward end of the beam is near the top of its travel, whereupon it descends to pick up the hammer 104. At this time the pump plunger 62 is exerting pressure upon the adhesive contained in the connector 40 and the nozzle piston 22 is being rotated mechanically by the latch 224 which had previously been engaged with the pin 226. This rotation of the piston 22 over an arc of approximately 45 brings the peripheral recess 20 thereof into register with the passsage 38 of the nozzle block just as the lugs 26 start to ride up the earns 96, 98. Consequently, at this time the nozzle piston 22 is being elevated to provide a space 16 and the adhesive under pressure in the connector 40 is pushed through the recess 20 and the passage 18 of the piston into the space 16 as fast as the space is formed with the result that there is no tendency to draw air through the nozzle back into the space 16.

At the bottom of the travel of the forward end of the beam 160, the tail of the latch 224, coming into contact with the stop 234, is nearly ready to be disengaged. The books 174 are pushed aside by the cross pin 112 of the hammer and then move lower until they receive said pin. As they do so, the slope of the hook surfaces engaged by the pin is such that the hammer is lifted slightly, thus taking it away from the nozzle piston to avoid any possibility of pre-extrusion by the weight alone of the hammer if it were permitted to rest on the piston. Then the latch 224 is released and the torque spring 222 turns the piston 22 to its original position where the recess 20 is out of .line with the passage 38 and the piston, having been elevated, is ready for the hammer blow. As the forward end of the beam 160 goes up, the hooks 174 are brought into engagement with the stops 182 and the hammer is released and is forced violently against the piston, extruding the adhesive.

Asthebeam 160. is coming down, thepump plunger 62.. moves. forward, putting under pressure thefluidin the, connector 40 and the passage 38. When, however, the. hammer is being raised. the pump plunger 62 is moving back andsincethe opening of the nozzle piston 22. is out of line, with the. passage 38. the pump. creates a slight vacuum which helps to suck the adhesive down from the chamber 50 through the opening 64. At the time when the. plunger 62 is exerting pressure on, the adhesive the by-pass valve '70 may be opened, depending upon the tension of the spring 72, and. may allow some adhesive to pass back into the chamber. As a result, thepressure. of the cement in the connector an is held at a desired value. depending upon the adjustmentof the; screws 74 at the top of the receptacle.

The invention. having. thus been; described, what is claimed as new and. what it is desired to secure by Letters Patent of the United States is:

1. In a machine for extruding an adhesive at high velocity, a nozzle holder. provided with a cylindrical; chamber, a nozzle at the outlet of. said chamber provided with a restricted outlet, a nozzle piston slidable in said chamber and adapted to be withdrawn partially to provide an adhesive-receivingspace just back, of the nozzle, a guide in alinement with said piston, a hammer slidable in said guide. to separate it from the piston, a spring in said guide back of the hammer, power-operated releasable means engaging, the hammer movable to draw it back and thereby to compress the spring, and means for automatically releasing the hammer at a predetermined point inits movement so that'it may be driven against. the nozzle piston and cause it'to extrude the adhesive from the chamber.

2. In a machine for extruding an adhesive, a nozzle carrier having a chamber, a piston slidable in. said chamber, a restricted nozzle partially. closing said chamber, a slotted guide member in. alinement with said chamber, a spring therein, a hammer slidable in said guide member to compress said spring and. having a transverse pin passmg through the slots of, the guide member, a poweroperated, oscillatory member movable adjacent to said guide member having a catch to engage said transverse pin, and means-for disengaging said catch at a point where the spring is compressed to permit the spring to drive the hammer against said piston.

3. In combination, a nozzle providedwith a chamber, a delivery aperture in said nozzle, a floating piston inthe nozzle chamber having a slidable fit therein, cyclically operated, power means to-move said piston toprovide a space adjacent to said aperture and forcibly to insert a charge of adhesive insaid space, a plunger guided in alinement with and arranged to engagethe endof said floating.

piston, and means including a compressed spring and a release therefor for. propelling the plunger to hit the piston and thereby to project the adhesive from the nozzle at a high velocity.

4. In an adhesive extruding machine, anozzleholder providedwith a cylindrical chamber; a restricted nozzle partially closing the outlet of said chamber, a cylindrical piston fitting said chamber and slidable therein, poweroperated, cyclical means for automatically filling the chamber beneath the'piston with adhesive at a predetermined time, compressible means, a hammer arranged for operation by. said compressible means to delivera blow against. the piston thereby toextrude the adhesive, povver means operating in timed relation to said filling means for moving the hammer away from the piston against said. compressible means, and means operating in timed rclationwith the filling of the nozzle chamber for releasing saidhammer to strike the piston.

5. in an adhesive extruding machine, a nozzle holder provided with a cylindrical chamber, a nozzle having a restricted opening and partially closing one end of said chamber, a piston slidable in said chamber to push. adhesive through the nozzle, said nozzle holder, having a.

lateral passage communicating, with the chamber, means for delivering adhesive under pressure to. said lateral. passage, said piston being provided with an axial passage opening. into the chamber between the piston and the nozzle and having also a peripheral opening communicating with said axial passage, means for intermittently moving said peripheral opening into communication with the lateral passage from positions in which the opening is' sealed by the wall of the chamber, and means to slide the piston axially to extrude the adhesive.

6'. In an adhesive extruding machine, a nozzle holder provided with. a cylindrical chamber, a nozzle having a restricted opening and partially closing one end of said chamber, a piston slidable in said chamber to push adhesive through the nozzle and having a polygonal portion coaxial therewith, said nozzle holder having a lateral passage communicating with the chamber, means for delivering adhesive under pressure to said lateral passage, said piston being. provided with an axial passage opening into the. chamber beneath the pistonand. a peripheral-opening communicating with said axial passage, means for intermittently turning the piston to bring. said peripheral opening into communication with the adhesive supply means, said. moving means comprising a lever projecting laterally from and having a slidable non-rotatable engagement with the polygonal portion of said piston, poweroperated means for oscillating said lever to admitadhesive to the nozzle chamber, and means to slide the piston axially to extrude the adhesive.

7. in an adhesive extruding machine, a nozzle holder having a chamber, said chamber being partially closed by a nozzle having a restricted opening, a piston slidable in said chamber and'having a polygonal head, an oscillatory lever engaging saidpolygonal head to turn it and slidable thereon in a direction axiallyofthe piston, a power-operated hammer for striking a blow against the top of said piston, means controlled by oscillation of the piston about its axis for delivering adhesive to said chamber beneath thepiston, and cam means for moving the piston axially during its rotation to provide a space in the chamber to receive said adhesive.

8. In an adhesive extruding machine, a nozzle holder providedwith a cylindrical chamber, a nozzle having a restricted opening partially closing said. chamber, a nozzle piston slidable in the chamber above said' nozzle, said. piston having a rectangular portion, an oscillatory lever. fittingsaid rectangular portion and adapted to partially rotate the piston, a lug on the piston beneath said rectangular portion, a cam supporting said lug to lift the piston'upon rotation thereof, means controlled by the rotationof the piston for delivering a regulated charge of adhesive to the chamber beneath the piston, a reciprocatory hammer for delivering a blow against said piston. to ex trude the adhesive, power-operated rneansfor energizing said hammer, and means operable in timed relation to said power-operated means for moving the oscillatory lever to lift the piston and effect charging of the chamber.

9. In an adhesive extruding machine, a nozzle holder provided with a cylindrical chamber, a nozzle having a restricted opening partially closing said chamber, a nozzle piston slidable in the chamber above said nozzle, said piston having a rectangular portion outside of said chamber, an'oscillatorylever fitting said rectangular-portion and adapted to partially rotate the piston, means controlled by the rotation of the piston for delivering a charge of adhesive to the chamber beneath the-piston, a reciprocatory hammer for delivering a blow against said piston to extrude the adhesive, power-operated-means for energizing said hammer, means operated in timed relation to said power-operated means for oscillating said'lever, a relatively fixed cam operative upon rotation: of the pis; ton by said lever to lift the piston as it is. rotated, and means for adjusting the positionof said cam.

1.0. In anadhesive extruding-machine, a nozzle holder provided with a cylindrical chamber, a nozzle having a restricted opening partially closing said chamber, a nozzle piston slidable in the chamber above said nozzle, said piston having a rectangular portion, an oscillatory lever fitting said rectangular portion and adapted partially to rotate the piston, lugs on the piston beneath said rectangular portion, a relatively fixed cam associated with said lugs to lift the piston upon rotation thereof, means controlled by the rotation of the piston for delivering a charge of adhesive to the chamber beneath the piston, a reciprocatory hammer for delivering a blow against said piston to extrude the adhesive, power-operated means for energizing said hammer, means operable in timed relation to said power-operated means for moving the oscillatory lever, the lever-operating mechanism including powermeans connected to the lever through a latch, and a torque spring so arranged that power delivered through the latch will cause movement of the lever in one direction while the power of the torque spring will operate the lever in the other direction.

11. In an adhesive extruding machine, a nozzle holder provided with a vertical chamber, a nozzle piston floating in said chamber, a nozzle tip partially closing the outlet of the chamber, means including a passage opening into the chamber and controlled by rotation of the piston for delivering adhesive under pressure to the chamber, a lever for oscillating the piston to effect said control movement, a hammer reciprocable in line with the piston, a spring for reciprocating the hammer, a power-operated beam having a swinging hook for lifting said hammer and compressing the spring,an arm mounted to oscillate with said beam and having a latch thereon, a swingable member pivoted on the axis of the beam and mechanically 10 connected to said lever, a torque spring between said arm and said swingable member, a pin on the swingable member for engagement by the latch, power means for oscillating said beam to cause said latch to move the piston-turning lever in one direction and to effect an operation of the hammer, and adjustably positioned stops for releasing the hammer and for releasing the latch whereby the filling of the piston chamber is efiected in timed relation to the operation of the hammer in driving the adhesive out of the chamber.

12. In an adhesive extruding machine, a nozzle, a nozzle holder provided with a chamber having an inlet passage, a nozzle piston slidable in said chamber and arrangedfor partial rotation to control the delivery of a charge of adhesive to the chamber through said passage, a hammer for delivering a blow against the piston to extrude the adhesive, said hammer having a transverse pin, a spring above the hammer, releasable means for engaging said pin, to lift said hammer, including a hook, the pin-engaging surface of said hook being inclined slightly upward to bring the hammer out of contact with the piston during the period before a blow is delivered thereto, and resilient means for pulling said hook into engagement with the pin.

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