US2013287A - Carry bag with bridging strip - Google Patents

Description

Sept. 3, 1935.

G. W. POPPE CARRY BAG WITH BRIDGING STRIP 2 Sheets-Sheet l Filed May 5, 1934 ATTORNEY 2 Sheets-Sheet 2 Sept. 3, 1935'. s. w. PoPPE i CARRY BAAG WITH BRIDGINGSTRIP Filed may 5, 1934 Patented Sept. 3, 1935 vPATIENT OFFICE 2,013,287 y CARRY BAG WITH BRIDGING STRIP George W. Poppe, Brooklyn, N. Y., vassignor to Equitable Paper Bag Co., Inc., Brooklyn, N. Y.,

acorporation of New York y Application ltiayl 5, 1934, Serial No. 724,144

3Claims.

This invention relates to a carry bag and the method of making the same and one of its objects is to produce a carry bag in which a minimum amount of paper is used consistent with the necessary strength. n

Another object is the production of a bag of this type by methods adapted for use with ordinary bag machinery and at the same speed with which ordinary bags are produced.

In my application Serial No. 724,143, filed May 5, 1934, I have disclosed a method of forming a tab or tongue on a vbag lip which tongue is of the same Width as the overlapped seam of one of th bag walls. `In the making of the bag by the method described in said application, reenforcement of the tab is brought about by reason of the overlapped seam. In' such lbag, however, where additional strength is found'fto be necessary, a reenforcing strip has been used which is secured to the front bag wall. This bag wall is therefore of double thickness and an additional amount of paper is required for its manufacture.

In the present invention, however, no more paper is required than in making an ordinary b ag and the reenforcement of the tab or tongue and the reenforcement of one of the bag walls through vwhich the tab passes to form a linger hold for ciarrying the bag may be made as vheavy as des red.

An important feature of the invention, therefore, is the use of a bridging strip of heavier material than the material out of which the rest of the bag is formed, the aperture in one bag wall passing substantially midway of the strip; the' tab likewise being cut into the edges of the bridging strip.

A further feature of the invention resides in the mannenby which the tab-is cut. In my Patent 1,895,267, January 24, 1933, I have shown a `carry bag in which the walls are widely overlapped and the tab is cut out of the seam within the paste lines. Considerable more paper is required in the making of such a bag than in the making of the present bag. Furthermore, in the bag of my said patent the tab is cut after the bag has been severed from the tube.

A further feature of the present invention, therefore, resides in cutting slits in the bridging strip prior to pasting said strip to the main bag web to form a tube, said slits being spaced apart a distance equal to the width of the tab.

The invention ,will be better understood by reference to the following description and ac companying drawings in which Figure 11s a front view of a bag of the present invention; l

Figure 2` is a view ofthe opposite side of the bag shown in Figure 1;'

Figure 3 is a section on the line 3 3, Figure l; 5

Figure 4 is a top plan view illustrating the manner of folding the main web and feeding the bridging strip or web thereto; y

Figure 5 is a section on the line 5 5, Figure 6;

Figure 6 is a section Vmore or less diagrammati- 10 cally shown `of an ordinary bag machine modified in a manner to practice the method of my present invention; and

Figure 7 is a view looking in the direction of the arrows along the line 1 1, Figure 6.

Referring to Figures 1 and 2 of the drawings, I indicates the front wall of my improved bag, which bag is formed by folding a 'web into a tube but the edges of the web do not overlap, the edge 2, as shown more particularly in Figure. being spaced from the edge 3. The edges of the web, however, are bridged by a strip or web 4 overlapping the edges 2 and 3 and secured to the main web by lines of paste 6 and 8. As illustrated 'in Figure 3, the bridging strip 4 overlaps the'25 main web on the outside but it is obviousthat said strip might just as well overlap on the inside. Either construction is within the scope of my invention. i 30 The bag is provided with a closing lip or ilap I0 which is a prolongation of the rear wall of the bag-and into the edges of this ,ap and approximately centrally of the bridging strip I form a tab l2 by slits I4 and-I5. When. the 35 lip il) is folded down on the wall I the tab I2 is adapted to pass through an aperture I8 in the front bag wall and a. superposed aperture I1 in the rear-wall, the 'apertlne I1 being within the side edges ofthe strip l. It fwill be apparent that such al bag requires no more paper than an ordinary bag having a central overlapped seam in its rear wall. The advantage, however, of, the present bag resides in the fact that notwithstanding the economic use of paper the strip 4 "45 may be made of material substantially heavier than that required for the rest of the bag and therefore the tab I2 whichis formed in this heavier paper forms a very substantial means by which the bag may be carried.

' The process by which the bag hereinbefore describedmay be conveniently produced is illustrated in Figures 4 to 7, inclusive, and since the bags of this type would in practice be produced by machinery, I have illustrated a conventional bagmachine by way of more conveniently setting forththe method.

Referring to Figure 6, I have shown more or less diagrammatically the essential elementsof a conventional bag machine and have illustrated one way in which such machine maybe modified in' order to illustrate my improved method of p roducing the bag illustrated in Figures 1 and 2.

For a more detailed showing and description of 10 y tol my Patent No. 1,943,549, granted January 16,

the operation of such machine, reference is made I do` not wish tolimit myself to the particular way illustrated by which the bridging web is brought into proper registry with the folded over edges of the main web, since such registry may be effected in different ways. however, of illustrating one practical embodiment of the method, reference is made to Figure 6.

The various shafts are drive ina manner well-known in the -bag machine art as more particularly set forth in my PatentNo. 1,943,549,

above referred to.

The paper forming the main web 20 is fed from a roll of paper 22 and passes over suitable guide rollers to a roller 24 which reverses its direction of movement. The web, after passing the roller 24, isfed undera former 26 about which it is folded to form the bag tube.. The beginning of the fold is show at 2l, Figures 4 and 6.

In the practice of my improved method, however, the edges of the webs 2 and 3, Figure 4', are not overlapped to form a bag seam as is customary in the making of an ordinary bag -but on the contrary the web is folded in such a,

.30 suitably supported from the base of the machine, said strip passing over an idler 32 and over a roller 34 supported on a shaft 36 journalled in an upright 31 forming part of the machine framework. The roller 344 is preferably made of steel and need not be substantially wider than. the strip 4, as shown in Figure 7. 'Ihe reason for this being preferably made of steel will hereinafter appear.

The web, after passing over the roller 3,41, is Afed adjacent a. roller 38 and near this point in its passage receives two lines of paste applied by paste discs 40 rotating in a paste-pot 42 suitably `supported in the framework of the machine. The

lauxiliary web or strip 4 is pulled along by feed rollers 44 and 45 driven from the main feed rollers 46, the latter in turn being driven from the lower pinch bar shaft 48 in the manner shown l in my said. patent, saidpinch bar shaft being For the purpose,.

Figure 5, wherein a gear49 on the shaft of the roller 45 meshes with an idler 5D, Figure 6, which in turn meshes with a gear on the upper main feed roller 46. The opposite end of the shaft of the roller 45 carries a gear 52 meshing with a gear 53 on the shaft carrying the roller 44. Gear 49 meshes with the gear 54 on the same shaft.'

By this arrangement the rollers 44 and 45 are driven at the same peripheral speed. The feed rollers 46 are not continuous but the upper two are, in fact, two rollers. It is customary to make these rollers in this manner as clearly shown in Figure 2 of my said patent. v From a consideration of Figures 4 and 6 it will be apparent that the auxiliary web or bridging strip 4 is fed in juxtaposition to the-main web afterthe same has been folded in the manner shown in Figure 4 with its edges 2 and 3 spaced apart. While I have shown the web passing on the outside of the main web, it is, of course, obvious that said web could be fed in juxtaposition to the main web prior to complete folding of the latter so that the auxiliary web or bridging strip 4 would pass underneath the 'edges 2 and 3 and in the finished bag said strip would be `on the inside instead of the outside.

It is customary in ordinary bag machines to apply a line of paste to the main web during its passage over the roller 24. In practicing my present method I do not apply any paste to the main web 20. The bag tube is completed solely through the bridging strip 4 and the paste is applied only to it. It is obvious, however, that if the strip 4 is run'on the inside the lines of paste might be applied to the main web adjacent the edges thereof but this would necessitate two paste pots spaced a considerable distance from each other. With the method described,

only one paste pot is needed, since the paste lines when applied to the bridging strip need not bewidely separated.

The rollers 44 .and 45 act as feeding means only for the strip 4. To press the edges of the strip 4 in close contact with the edges of the main web I employ a roller 5I. The tube is now completely formed and is cut into bag lengths by the usual mechanism provided for this purpose: Briefly',` this mechanism includes the pinch barsy 56 which at the proper time retard the movement of the tube, creating the necessary slack to enable it to be readily severed. This is done at the proper instant by a striker bar 58 carried by a sprocket chain 59 passing over sprockets 60 and 6I which gives a sharp blow to the under side of the tube, one Wall of' said tube being severed' bythe serrated edge 62 of the former and the other or upper seam wall being severed by theserrated edge .64 of the lip knife. In Figure 6V the thickness of the several plies of paper are shown somewhat .exaggerated to show the construction of the tube.

The tab I2 is preferably formed by making pairs of slits at bag length intervals apart in the bridging strip 4 before the same is pasted to the main web.A This may conveniently be done by providing a pair of dies 66 mounted on a shaft 68 which is driven by a sprocket chain I6 driven by a sprocket 1| mounted on a shaft 12 the latter corresponding to the shaft I3, Figure 1 of my aforesaid Pate'nt No. 1,943,549. The radial distance between the Vshaft 68 and the cutting edge of the dies is the same as the radius'of the 1feed rollers 46. The diameter of said rollers 46 is such that upon each rotation thereof the web is fed forward a bag length. The shaft 68 is so geared that it makes one revolution with each revolution of the rollers 46. It results thereforcthat the dies 66 will make slits in the web 4 at bag length cuts the upper bag wall along a line which meets known way.

the ends of the cuts I4 and l5 made by the dies 66 in the web B, as clearlyA shown by the dotted line 13, Figure 4. The lip knife 8l has a rounded edge, thereby giving a romded shape to the bag lip. The left hand portion, Figure 4, shows the end of the tube as having been cut od, the edge I4 indicating the` cut made by the lip mife while the edge 'l5 indicates the cut made by the edge'of the former.

After a bag sectiorris thus cut off, the bottom passes the mechanism (not shown) which folds and pastes the bottom in the usual and weli- Ithas been previously stated Lthat the roller 34 is preferably made of steel and the reason for this is due to the fact that the dies '66 act against this roller in cutting the slits'in the web; which slits are to form the edges of the tab in the flapv of the finished bag. v

1. Acarry bag formed of a folded web of one weight of paper, the edges of which web are spaced apart at the rear bag wall, a bridging strip of heavier paper secured at its edges to the separated edg'es of the folded web, said bridging strip runningthefulilengthoftherearbagwall, a. closing hap which is a prolongation of said rear wall and a tab cut into the edge of said flap and within the side edges of said bridging strip.

2. A carry bag formed of a folded web of one weight of paper, the edges of which web are spaced apart at the rear bag wall, a bridging strip of heavier paper secured at its edges to the separated edges of the folded web, said bridging strip running the full length of the rear bag wall, a closing ap which is a prolongation of. said rear wall and a tab cut into the edge of said flap and within the edges of said bridging strip and an opening in the bag walls through which said tab may be passed.

3. The method of producing a bag as defined in claim 1 which consists in folding a vweb of after folding being spaced apart, cutting slits in a second web spaced apart a distance equal to the desired width of a tab, such slits being spaced bag length intervals apart, feeding said second web in a manner such that its edges overlap the spaced edges of the folded first web, securing the second web to the edges-of the first web and severing the completed tube so formed into bag lengths, the line of severance of the seam wall meeting the edges of a pair of said slits.

GEORGE W. POPPE.

paper to form a bag tube, the edges of the web

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