US2521187A

US2521187A - Bag machine and method

Info

Publication number: US2521187A
Application number: US623513A
Authority: US
Inventors: Francis T Robinson
Original assignee: Arkell Safety Bag Co
Current assignee: Arkell Safety Bag Co
Priority date: 1945-10-20
Filing date: 1945-10-20
Publication date: 1950-09-05
Anticipated expiration: 1967-09-05

Description

Sept. 5, 1950 F. T. ROBINSON 2,521,137'

BAG MACHINE AND METHOD Filed oct. 2o, 1945 I s sheets-sheet 1 3 Sheets-Sheet 2 Filed Oct. 20, 1945 INVENTOR SePt- 5, 1950 F. T. RoBlNsoN 2,521,187

BAG MACHINE AND METHOD Filed Oct. 20, 1945 3 Sheejcs-Sheet 3 i' INVENTO Patented Sept. 5, 1950 PATENT o rr les BAG' MACHINE AN D-METHO`D- Francie T. Robinson, Rockville Centre. N. Y., asfsignor. tot` Arkell.. Safety Bag Company, New York, Nl Y.,A :incorporation` of. New York pplicationctober 20, 194`5,Serial Noi 6235513 6. Claims..

The present inventiom relates; tomachines for; and methods of manufact-.unfng-:bagsgnandi liners',

for-f bags and other. containers, and has.` for its object! to provide av novel; and, improved machine and method' of this: character'.

Thevseveral. features.- of. the inventionwhereby this; and other objects may bev atta-ined. will.v bereadily.' understood from the: following descrip-` tiorr and accompanying? drawings; in which.:

Figure 1 is; af. longlztndinail sectionaL elevatiom partly dagramma.tical; of the` machinew itsr preferred form-i.

Fig; Z-is azplanfview oithesame; with certain parts broken away;-

Figg isa. sectional.` view.; on an enlarged scale,r takemsubstantiallyonrthefline. 3--3 of Fig. 2f;

ligznis4 issfa planview oi apart-off the machine shown.y iInFig.. 3;

Fig. 5 isa. sectional-view. one anv enlarged scale", taken. substantially enf. thefline; 5 5? of Fig. 2.,;

Eig. 6. is.: al. detail. sidef elevation corresponding to aportion of.y Eig.. 1, button anfl enlarged. scale and: with certain parts'shawn im diner-.ent opera.- tive. positions;v

Fig.. 7U isf: a rear sides` view partly: in section of the-portion of the machine shown` in-Eig. 6

Fig.. Bffs: a sectionakviempartly elevation, taken on4 the lined-ot 6;.,

Fig.. a is a .detail sectionah elevation taken, ony the line 9 9 of Fig. 8; and

Fig. 1.0.` isf aivieva inperspectiveeofa. bag orl-iner adaptedito'1 bei formed# by my impravedf machine and'. in accordance withmy improved method.

The. machine'. illustrated` im the. drawings is particularly. adapted for. useli-n thef manufacture of.v thabagy or liner described` and;claimed inithe pending application.v ot?. James-Ei Doyle. Ser. No. 610,258., iilect Aug-.ust 1;1 w45., Bag andfMet-hod. (now abandonedl..`

As, shown-, this bag. or liner: isd made off two piecesor-sheetsiof materialzZ and-.d` This-2material preferably comprises twofsheetseofi crinkled paper which are separately crinkled and are laminated. together1 by means-Y of asphalticv or other suitablev Waterproof... adhesive.V two pieces or; sheetsV 2. and 4e ofthis laminated" paper are; arranged; oneL aboye.- the other; to'` for-m the side walls of the bag, the crinklesL of the paper extending; longitudinally' off the bag., The:v side Walls have thefinnery sides of-A their longitudinal margins secured together by asphalticor other suitableadhesivef so. as to formj thevi sidel seams oi the bag.. The projecting marginl ami' thevlower end of the side wall 4 is folded over the lower edge ot tlcie.V side wall 2 is adhesifvely secured thereto. by. meansA of. asphaltici or' othery suitable adhesive. to forma closed bottom: for thet bag..

The: upper margin l0 of. the. side Wallf, 4 of. the bag is folded back. upon itself'.v The outer side ofv this folded margin l0 and the inner side of the. adjacentd margin ,la are coated with@ adhesive Hs These stripes of adhesive' I-iare of such. a naturethat they: remainv tacky at normal temperatures, and whenf; the two coatedf` surfaces are brought together may.- be-securely sea-led; by the application of heat andv pressure.v or pressure: aloneV so: as to securely close the mouth of thebag'.

.Separatestrips of cellophane lfd'may be applied over the. adhesiveI coatings H soas to protect` the adhesive during shipment and: storage. rI-"he edges of theY cellophane strips should` project slightly beyond the edges. of the stripes of adhesive` andthe inner edges of the strips; overlap soa-s to prevent spreading. of the adhesive beyond the edges of the strip. WhenA the bag isv to be used these cellophane strips may bekremoved to expose the adhesive and thus. permit the mouth of thev bag to be. closed.

Bags or liners of thisv type may be ofconsiderable width, a standard Width being 96-inches. In order to` enable the packer to. easily remove the strips IiiV from the adhesive, a loop; iii is formedv in each cellophane strip through which the packer may.A insertl his. finger or otherwise grasp the loop. and easilyripthestrip` from the adhesive. In the case, of the wider bags atleast, the loop is preferably made` in each strip. sub.- stantially midway between its ends, so as to reduce the distance the strips are removed at op.- positev sides of the loops.

In accordance with the present invention, the sidewalls 2 and. 4i of the. bag are formed from webs: I8. and '20; respectively, which. are supplied tothe machine inrolls 2If and 22 which. are mounted to turnx onshaftsf24. The Webs I8 and 20'- are` of. a width correspondingto the lengths ot the sheets 2-. and-- 4, respectively. The. web 2! is arrangedlr above the Web I8 andy the further margin of the web 2U (viewing Figs. l; and 2) 'projects a, distance.- beyond the corresponding margin oil the web I8 toprovide the. folded over margin 8.- of the completed bags or liners. The crinklesin thewebs I'8. and 20 extend transversely thereof sothat in the completed bag they will extend longitudinally of the bag as above described.

From the supply. rolls 2|- and 22 the webs i8 and 20 respectively pass over'pairs of draw-rolls 2 6. and 2.8. Fromthe draw-rolls 26. the webl LB passes beneath a guide-roll 3!) and then between pressure rol-ls 32. The lower of these. rolls "1s a ful-l width roll but` theupper one is narrowfaced, the purpose. of which is tosqueeze out a little of the transverse stripe`v of adhesive from. the upper web to the lower web sov it willl meet up withlongitudinal stripe of` adhesive` when said stri-p.A is applied.

The web 20 after leaving the draw-rolls. 28 passesbetweenl scoring disks` 34 which. score the weba distance from its edges corresponding to the Widths of the margins-8 and Le of the comn pleted bag (Fig. 10). The web 20 then passes beneath a guide roll 36 and over a guide roll 31 to a glue-roll 38. The web 20 at this point is normally held out of contact with the glue-roll 38 by means of the guide-roll 31 and a guide-roll 40 in front of the glue roll. At predetermined points in the travel of the web, however, a wiping blade 42, secured on the ends of arms 44 which are carried by a rotating shaft 46, strikes the top surface of the web to momentarily bring the web into contact with the glue-roll 38 so as to apply stripes of adhesive to the underside thereof. These stripes of adhesive are for the purpose of securing the longitudinal margins 6 of the side walls of the completed bag together. From the guide-roll 40 the web then passes between the pressure-applying rolls 32 which cause the webs I8 and 20 to be attached together by means ofthe lines of adhesive applied by the glue-roll 38. A suitably supported doctor blade 39 (Figs. 3 and 4) regulates the amount of thickness of the adhesive applied by the roll 38. Also a wiper blade 4| governs the length of the stripe of adhesive according to the width of the web.

From the pressure rolls 32 the two webs thus joined pass beneath a guide-roll 48 and a narrow glue-roll 50 which applies a coating of adhesive to the under side of the projecting longitudinal margin of the web 20 which forms the folded over margins 8 at the bottoms of the completed bags.

After the two Webs pass from the glue-roll 58, suitable folding blades 52 fold the near longitudinal margin of the web 20 (viewing Figs. 1 and 2) back upon itself to form the folded-over margin I of the completed bags. Also at this time suitable folding devices 54 fold the adhesively coated margin of the web 20 upon the underside of the corresponding margin of the web I8 to form the closed bottoms of the bag.

The webs then pass beneath a guide-roll 56 and over a guide-roll 58. As the Webs pass over the guide-roll 58, a grooved glue-roll 60 applies stripes of adhesive I I to the margins of the webs that are to form the margins I0 and I2 of the mouths of the bags.

After leavingr the guide-roll 58, the webs then pass over a plate or table 6| and between drawrolls 62. At this time, strips 63 of cellophane from supply rolls 64 are applied over the stripes of asphaltic adhesive I I, these strips forming the covering strips I4 of the completed bag. The two strips 63 are applied by means of a roller 66 over which the strips pass in overlapping relation (Figs. 6 and '1) so that when the strips are applied they are arranged in overlapping relation as shown in Fig. 10. The strips 63are fed and guided from the supply roll 64 to the applying rolls 66, by means of a draw-roll 68 which is normally driven at the same surface speed as the webs. The

rolls

66 and 38 are mounted on shafts in a bifurcated arm of a lever which is secured on a rock-shaft 12. The draw-roll 68 is driven through a chain 14 which passes over a sprocket wheel secured on a shaft 69 on which the drawroll 68 is also secured, and a sprocket wheel mounted to turn on the rock-shaft 12. The latter sprocket wheel is secured to a second sprocket wheel also mounted on the shaft 12 and driven by a chain 16 from a sprocket wheel 18 that forms one member of a one-way clutch 80, the other member of the clutch being secured on a driving shaft 82.

Secured on the hub of the sprocket wheel 18 is a ratchet wheel 8l! which is engaged by a pawl 86 mounted on a pivot pin or shaft 88 Carried by the end of an arm 90 pivotally mounted on the shaft 82. This pivot pin 88 is connected by a rod or link 92 with the upper end of the lever 10.

The rock-shaft 12 is adapted to be oscillated by means of a cam arm 94 secured thereon which carries a cam roll 96 that engages a cam 98, the cam roll being held in contact with the surface of the cam by means of a coiled spring |00 connected with the cam arm 94.

With this mechanism, as the Webs are being fed beneath the strip-applying roller 66, the cellophane strips 63 are uniformly applied in overlapping relation over the adhesive on the margins of the webs, the strips of cellophane being fed by the draw-roll 68 at the same surface speed as the travel of the webs.

In order to form theloops I6 in the cellophane' strips at suitable intervals, the cam 98 acts through the cam arm 94, rock-shaft 12,'lever 10, rod or link S2 and the pawl 86 to increase the speed of rotation of the sprocket wheel 18 with relation to its driving shaft 82, the clutch permitting this to' be effected. Such increase in speed of the sprocket 18 and thus the draw-

rolls

69 and 66 is necessary because the draw-rolls are moving in a direction opposite to movement of the bag web, and this additional speed makes up for this rearward movement so that when arm 94 drops suddenly off the high spot of cam 98 and pulls strips 63 forward faster than the web is moving, the loops are then formed. As this occurs the lever 18 lifts the strip-applying roll 66 from the webs. When the cam 98 allows the applying-roll 66 to return to strip-applying engagement with the webs, a suflicient'amount of slack has been provided in the cellophane strips' to cause the loops I6 to be formed in the strips as the applying roll returns to its normal strip-applying engagement with the webs. The rod or link 92 is connected with'the lever 10 through a suitable pin and slot connection I0| whereby'the extent of movement imparted by the lever 10 to the ratchet wheel 18 may be varied to vary the size of the loops I6,

After the webs with the cellophane strips applied thereto leave the draw-rolls 62 they pass between a stationary cutting blade |02, and a cooperating rotating blade |04 which is operated in proper timed relation to the feeding of the webs to sever the webs on lines extending centrally through the transverse lines of adhesive which when thus severed secure together the longitudinal margins 6 of the completed bags. As the completed bagsare cut olf from the composite web by the blades |02 and |04 they drop upon a delivery belt |06 which discharges them from the machine.

The drive mechanism' of the machine is illustrated diagrammatically and need be but briefly described. The machine may be driven from an electric motor 4|08 which through av belt or chain I'Ill drives a shaft ||2. This shaft ||2 carries a pinion I .I 4 which" drives a large gear ||6 secured on a shaft |,I8 on which one of the main draw-rolls 62 is secured so as to be driven thereby. The shaft I8 through a sprocket'chalin or belt |20 drives the sprocket and ratchet wheel shaft 82.

The grooved glue-applying roll |50 is driven from the shaft ||2 through a sprocket chain |48 which drives a shaft |50. This shaft through a sprocket chain |52 drives a shaft |54 which through gears |58 drives the shaft of the glueroll 60.

The variable speed drives |24 and |62 which may be of the Reeves type, enables the operator to relatively vary the feeding of the front and rear end .portions of the webs so as to maintain them under proper tension without placing undue strain thereon.

By varying the operations of the cutting-off blade |04 and the transverse adhesive applying wiper blade 42, with relation to the speed of travel of the webs, bags of different widths as desired may be manufactured on the machine. Such variation in timing of these parts with relation to the feed of the web may be easily accomplished by changing the gear |30 through which said cutting blade and wiper blade are driven.

Different length bags may be manufactured by employing suitable width webs, and adjusting the folding and scoring devices for the further edges of the Webs (viewing Figs. 1 and 2) to accommodate the different widths.

It will be apparent that my machine is simple in construction, capable of producing bags uniformly and expeditiously and may be easily and quickly adjusted for the manufacture of bags of different lengths and widths.

As will be evident to those skilled in the art, my invention permits various modications without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

1. In a bag machine of the class described, the combination of means for feeding two webs 1ongitudinally one over the other, means for adhesively securing together longitudinal margins of the webs at one side of the longitudinal centers of the webs, means for folding over upon itself the other longitudinal margin of one of the Webs, means for applying stripes of adhesive over the inner surface of said folded over margin and over the surface of the margin of the other web adjacent thereto, means for applying transverse stripes of adhesive to the inner surface of at least one of the webs, With the centers of the stripes of adhesive spaced apart corresponding to the width of the bags to be formed, means for positioning the webs together as they are being fed, and means for severing the Webs through the centers of said transverse stripes of adhesive during the continued feeding of the webs.

2. A structure according to claim 1 in which means is provided for applying covering strips to the surfaces of said stripes of adhesive.

3. The combination of means for feeding a web longitudinally, means for applying a stripe of adhesive to one of the longitudinal margins of the web as 1t is being fed, and devices for apply- 6 ing a covering strip to the stripe of adhesive having provision of means for forming transverse loops in the covering strip spaced apart longitudinally of the covering strip.

4. The combination of means for feeding a web longtiudinally and means for applying a stripe of adhesive to the web longitudinally therof, devices for feeding a covering strip longitudinally over said stripe of adhesive comprising a roller for applying the strip to the adhesive, means for rotating the roller at the same surface speed as the surface speed of the feed of the web, and means acting automatically at predetermined intervals during the feeding of the web to retract the roller from the web and increase the strip-feeding action thereof and` then restoring the roller in strip-applying engagement with the web and restoring its surface speed to the surface speed of the feeding of the web whereby transverse loops are formed in the covering strip at spaced points.

5. The method of manufacturing bags of the class described which comprises feeding two webs longitudinally one over the other, adhesively securing together longitudinal margins of the webs at one side of the longitudinal centers of the webs as they are being fed, folding over upon itself the other margin of one of the webs, applying a. stripe of adhesive over the inner surface of said folded over margin and over the surface of the margin of the other web adjacent thereto, applying transverse stripes of adhesive to the inner surface of at least one of the webs with the centers of the stripes spaced apart corresponding to the Width of the bags to be formed, positioning the webs together as they are being fed. and severing the webs through the centers of said transverse stripes of adhesive during the continued feeding of the webs.

6. The combination of means for feeding a web longitudinally, means for applying a stripe of adhesive to the web longitudinally thereof as it is fed, devices for feeding a covering strip longitudinally over said stripe of adhesive comprising a roller for applying the strip to the adhesive, means for rotating the roller at the same surface speed as the surface speed of the feed of the strip, means acting automatically at predetermined intervals during the feeding of the web to retract the roller and the portion of the strip engaged by the roller from the web and at the end of a predetermined interval after each such retracting movement restoring the roller in strip-applying engagement with the web, and means for increasing the speed of said roller during each period that it is thus retracted so as to cause spaced transverse loops to be formed in the strip.

FRANCIS T. ROBINSON.

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

UNITED STATES PATENTS Number