US2422426A - Automatic bag sewing machine - Google Patents

Description

June 17, 1947. F. LOMBARDO 2,422,426

AUTOMATIC BAG SEWING MACHINE Filed Aug. ll, 1944 3 Sheets-Sheet 1 INVENTOR.

Y AJTTO/WVEV.

@vvk Lombarda June E7, 1947. F. LOMBARDO AUTOMATIC BAG SEWING MACHINE Filed Aug. 11, 1944 5 sneetssneet 2 INVENTOR jun@ y?, g'r?. F, LOMBARDO AUTOMATIC BAG SEWING MACHINE Filed Aug. ll, 1944 5- Sheems--Sheerl 5 INVENToR. fa/7k O/Wam/o 1477 @NEX Patented June 17, 1947` UNITED STATES PATENT F FICE .AUTOMATIC BAG SEWING'MAGHINE i Frank Lombardo, Kansas "City, Mo.

LApplication.August.11, 1944, :Serial N0. .548,976

8 Claims.

This invention relates `to'equipment employed in the .manufacture of bags, in the nature of thoserequiredzto bie stitched along at least two marginal edges, .and ythe ,primary aim .is to ,providesewingapparatus having unique and novel conveying Yelements in association with .a yilluralityof sewing-machines, whereby the bags may be-'transportedLoneat .atime into operative relation VVwith each machine.

This invention has for an important object, `the provision ni bag making iequipment wherein is included, :in icomibination with :at #least two 'sewing machines, :.a .conveyor :orfmoving the bags past `the several machines to rsuccessifvely stitch the :marginal edges .of the :bag blank, .said conveyor .being aconstructed y'to .shift lthe bags .after Aleaving :one :machine and before :introducing `the same -to the next succeeding .sewing machine.

'Anpther object :of this invention .is `.the A.pro-

visionof a bagmakng machine .havingparts for 'automatically presenting :each -of several .marginal Tedges* to lseparate sewing machines, :as 'the bag is moved along a rectilinear pathfoftravel vThis invention has iffor .further ,aims -the .provision in .a -bag :making machine, `of @parts -ior severing .the threadsiaftereach `marginal edge-.0f the bag :haswbeenf-stitched; means for automat- :ically moving the thread .severing *,.parts to and from -fthe .operative position; :elements for sup- .portingathe bags for fmovementfthrough ithe y ma- -chine `:and ior automatically rejecting the .bags .after .-the .same @have :been stitched .along at 4least .two V:edges thereof; zand aunque manually Poper- .able clamps ...for holding the .bags .against rotatable .tables .withmarginal :edges :disposed .to .be engaged Lby .thesewing .machines .forming a .part ,ofthe equipment.

Other objects f'the invention will appeanduring thecourse ,of .the following.specication,re ferring tothe accompanying drawings, wherein:

'Fig'. 1.-is. a.'t0.p.p1an viewof an -automaticlbag sewing machine madein laccordance with 'the present invention.

Fig. 2 is aside elevational view thereof.

..Fig. A3 -'is Ha .vertical transverse, enlarged sectional ^view through a 'portion cf "the machine taken on line III-III of Fig. 2.

Fig.4"isafragmentarydetailed sectional view `rcitatable' table assemblies, entirely removedxfrom r2 the :operative relation with .the remaining lportion yof the machine. Y

The preferred `embodiment loi the invention which has been-chosen `for illustration, is capable of sewing Vtwo marginal edges -of a bag as the same is A.passed through the equipment and a single'operator is .all that isrequired to manipulate-.the apparatus;` it beingbut necessaryxto place the bags-upon Acontinuously moving tables as they pass the feeding station. When the folded blanks of .the bags are introduced tothe machine, -they are stitched along two marginal edges, the .threads .are .automatically severed after each stitching, .andthe completed bag is ejected yfrom the machine `as the .tables `are cleared for .the further introduction of additional, unstitched vbag blanks.

The machine comprisesa suitable frame-work `l0 -upon which is mounted all of the operating ,-parts, .and particularly the endless chains I2, disposed.inspaced-apart relation and carried by sprockets VHladjacent vto `each end of frame IU. Sprockets I4 are securedto shafts i6 journalled Ain `slidable vbearings l-8 Athat are in turn held in desired adjusted conditonby set screws 20.

.A seriesof plates 22 ,attached to chains .I'Zby integral ears 24 maintain tables 26 in place. Each plate 2.2 carriesa turn-table 2.6 through themediumotstubshaftfzroller bearing 30, and stop ,collar..3'2. .When a table .25 is so mounted upon .plat.e..22, .it .is `free to rotate about the :axis of vstub .shaft 28, .limited onlyA by pin 34 which extends through anarcuate slot 36 provided in plate 22.

A spring ,-yieldably .maintains table 2-6in .the .position .withzits .longitudinal axis in alignment withthepathof .travel of. chains. l 2 and theseries .oftables 26. .This spring 38 has one end anchored .asat-.Ml totheundersideof plate 22 and its op- ,.positeend fastened as `at-ll-Z ,to stop .collar 32, .pinned .to .stub shaft .28.

rEars 24 are pivotally .attached to chain l2 by'gpassingfa bolt or analogous means 44 through the perforationszof'ears .24 and thence through -thenopenings ,in .the .overlapped ends of ltheflinks .of.chains l2.

'Each table .26 has v:a especially devised clamp tforfholding the ,bag'4-6 thereon -with `twocf .its marginal .edges projecting beyond the edges of the table. The dot-and-dash outline of bags 46,shown\in Fig. vl, vclearly reveals the manner fin which lthezclamp-now about vto be described, .operably maintainsthe bag Lin place `upon table .for movement .through the two sewing .ma-

chines.

The bag clamp comprises bearings 48 and 50, integral with table 26 and journalling shaft 52 upon which is mounted a drum 54 having a cam slot 56. An arm 58 secured to shaft 52 carries beam 60 at its free end, which beam extends in parallelism with one edge of table 26. Another arm 52 joined to shaft 52 connects with beam 60 at its free end to complete a three-sided upper frame portion below which a bag contacting frame is hung through the medium of short coil springs 64. The lower frame is two-sided because it is necessary only to exert pressure upon bag d6 along the marginal edges to be stitched. y

Bar 66 hung beneath beam 60 is free to move toward and from beam 60 because of` springs 64, and further because a yoke 'I0 serves`as a guide;

` A similar yoke 12 depending from armv 62`strad,

dies bar Hl hung beneath arm 62. A leaf spring 'I6 anchored as at 1B to exert downward pressure on arm 62 of the upper frame cooperates with spring 80 to establish a compensating yet suincient pressure upon the bag when it is resting upon table 26 and beneath bars 68 andl.

Spring 60 has one end attached as at 82 to `table 26 while its opposite end is fastened as at x vated condition, ready for'the operator to place a bag 46 and lower the clamp thereagainst.` When the clamp is lowered, spring 80 will assume that position shown in full lines of Fig. 3, and thereby yieldably hold the clamp and its underlying bag against the top of table 26.

There is a clampV of the aforementioned type secured to each of tables 26 and when the drums 64 are carried past pin 86 mounted on frame I0, the engagement of this pin by cam slot 56 will move the clamp to the dotted line position shown in Fig. 3 to eject, by gravity, the bags that have been stitched. Y

Pin 34 projects through slot 36 iny plate 22 for engagement with guide member 88, mounted on frame I6 and disposed in the path of travel of the several pins 313, as illustratedv in Fig. 1. Whenrthe tables 26 and all the parts associated therewith, are moved toward member 88 bychains I2, pinsSd of each table assembly will strike the edge of member 88 and cause table 26 to rotate about stub shaft 26 through a 90 arc and assume the position shown to theleft in Fig. 1.

The movement of table 26 is against the tension of spring 38 and as soon as guide member 88 releases pin 34, spring 38 will draw table 26 to the normal position or where its longitudinal axis is in alignment with the path of travel as shown to the right in Fig. 1. A portion of table 26 and its related parts is shown in Fig. 1, after member 88 has released its engagement and the pin 86 is within cam slot 56, as seen in Fig. 2.

The bags 46 are laid upon each table 26 as they pass the operators station, which is at the right end of the machine, as viewed in Fig. 2. The clamp assembly is dropped upon the bags to hold the marginal edges 90 and 92 beyond the proximal edges of table 26.

rIwo sewing machines of like character are disposed in tandem and in the path of travel of bags 46. These sewing machines are generally designated by the numeral 94 and each is equipped with the conventional presser foot 916 and needle 98. The machines are mounted upon a portion of frame I6 and the tables |00 thereof are in substantially the same horizontal plane as the upper face of tables 26, to the end that marginal edges SI) and 92 are drawn beneath presser foot 96 for stitching.

After the first machine 64 has stitched marginaledge 99 of bag 46, threads will trail behind bag 46 and join machine 96 to the bag until the threads are severed. Automatic means for cutting these threads is provided for each machine 94 and the description of one will serve to clarify the construction and operation of all.

The chain I2 neXt to machines 94 carries a number of cams |62 arranged to strike plunger |04 reciprocably mounted on frame I0 and held in'normal position by spring |66. A cutter wheel |06 rotatably mounted on the end of arm III) is driven through the medium of belts I I2 extending to the power mechanism of machine 94. Cutter wheel |68, therefore, constantly rotatesat a relatively high rate of speedwhether Narm H0 is in the position shown in Fig. 3, or whether it is swung to a thread severingv position when plunger Hill is engaged by one of cams |62., After'bagdl is moved past Ythe plane in which'cutter wheel `I lill` is disposed, plunger |66 is kicked outwardly' in the direction of the arrowv in'FigB, toswing arm |I6 toward the trailing threads Lbetween bag `I6 and needle 96.

Plunger |04 is joined to lbell crank lever.y |I4 coupled to another bell crank lever YI I6 by vlink H8. Link |26 interconnects bell crank lever I6 with the upper end of arm I0 mounted to rotate Y about the axis of pintle |22. Part of frame I0 supports arm II!) and the swinging movementof arm I I6 serves to sever the threads before pin`34 on the table carrying the bag being treated,

strikesguide member 88 to dispose marginal 'edge 92 in place to be stitched by theV next succeeding machine 94. There is a cutting mechanism for each machine and cams |02 willinsure operation at the proper moment. f K' The preferred form of the automatic bag sewing machine has |been clearlydisclosed and the function and manner of operation hasbeen made clear during the course of the foregoingspecilication. It is obvious thatY all the attendant" need do is to place the ba-g 46 on each table asit passes his station, lower the clamp to holdtheb'ag place'on each tableV 26, and' perform this'task las each Ytable presents itself. Not/only4 will-the'two marginalA edges 6U and 92 bev lstitclied',rlollth'the vthreads Will ybe severed at the proper timejand.

the completed bag will beejectedwhen the clamp is moved to a point where the bagwmaydrop by gravityY from each table 26. at thecnd'of ythe machine. y Obviously, bag sewing equipment havingv specic structural details differing from thoseV shown and explained maybe .made jwithout` departing Lone, machine yand beforeitgreachesthesecond machine.

2. In bag making equipment of the character described, a pair of sewing machines mounted in tandem; a conveyor for moving the bags along a path of travel past the sewing machines; means for severing the thread applied by each sewing machine after the bags have been stitched along certain marginal edges by the machines; and a bag supporting table rotatably carried fby said conveyor for turning the bag held thereby after one marginal edge thereof has been stitched by one machine and after the thread therefrom has been severed and before the bag reaches the second machine to a position for stitching another marginal edge of the bag by said second machine.

3. In bag making equipment of the character described, a pair of sewing machines mounted in tandem; a conveyor for moving the bags along a straight path of travel past the sewing machines; clamps shiftably mounted on the conveyor to hold the bags in positions engageable by the sewing machines; and means for releasing the Ibags from the clamps after both sewing machines have acted thereon.

4. In bag making equipment of the character described, a pair of sewing machines mounted in tandem; a conveyor for moving the bags one-ata-time along a straight path of travel past the sewing machines where a marginal edge is to be stitched by each machine respectively; clamps shiftably mounted on the conveyor to hold the bags in positions engageable by the sewing machines; means for releasing the bags from the clamps after the sewing machines have acted thereon; and means operable by the conveyor for severing the thread from the sewing machines after the bags have passed therethrough and before the bags are ejected from the equipment.

5. In bag making equipment of the character described, a plurality of sewing machines; a conveyor for moving the bags along a straight path of travel past the sewing machines one-at-a-time; clamps rotatably mounted on a vertical axis on the conveyor for holding a marginal edge of each bag in operative relation to one of the sewing ma chines whereby the edges of the bags are individually stitched; and means for shifting the clamps to an inoperative position to eject the bags from the equipment after all the sewing machines have acted thereon.

6. Bag making 4equipment of the character set forth in claim 5, wherein the clamps each have yieldable means for holding them in an inoperative position, said means serving as the clamping force when the clamps are holding bags therein.

7. In bag making equipment of the character described; a plurality of sewing machines; a conveyo-r for moving the bags along a path of travel past the sewing machines one-at-a-time; means for rotating the bags after they have been stitched by one sewing machine and before the next succeeding sewing machine stitches the bag; and means for severing the thread joining the bag and one machine before the bag is rotated to enter the next machine.

8. In bag making equipment of the character described, a plurality of sewing machines; a conveyor for movingthe bags along a path of travel past the sewing machines one-at-a-time; a clamp for securing the bags in place on the conveyor; and means for rotating the clamp and the bag held thereby through a turn after one marginal edge of the bag has been stitched by one of the sewing machines and before the conveyor has moved the bag into operative position with the next succeeding sewing machine.

FRANK LOMBARDO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date l145,329 Kerr Jan. 27, 1891 858,005 Lowe June 25, 1907 1,187,057 Foster June 13, 1916 1,926,694 Berger et al Sept. l2, 1933

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