US2026140A - Compartment bag and process of making same - Google Patents

Description

Dec. 31, 1935. (5, w PQPPE 2,026,140

- COMPARTMENT BAG AND PROCESS OF MAKING SAME Filed March 22, 1934 3 Sheets-Sheet l Dw.31,1935. 4 W PPE 2,026,140

COMPARTMENT BAG AND PROCESS OF MAKING SAME Filed March 22,1954 5 Sheets-Sheet a ATTORNEY Dec. 31, 1935. G. w. POPPE COMPARTMENT BAG AND PROCESS OF MAKING SAME 3 Sheets-Sheet 5 Filed March 22, 1934 c -1. H f d W |l a T N 1 m m M W T M N T M I l f F A 6 2 am l I l Patented Dec. 31, 1935 I UNITED STATES PATENT OFF-ICE 2,926,140 COMPARTMENT BAG AND PROCESS OF MAKING SAME George W. Poppe, Brooklyn, N.

Equitable Paper Bag 00., Inc., a corporation of New York Y., assignor' to Brooklyn, N. Y..

This invention relates to paper bags and more particularly tocompartment'paper bags and one of the objects of the invention is the production of a bag of this character which maybe manufactured at low cost by bag methods, with ordinary bag machinery and without waste ofpaper.

A further object is to produce a bag and more particularly a compartment bag in which a minimum amount of paper is used to produce a bag of maximum length.

In my Patent 1,943,549, dated January 16, 1934,- I have shown a machine for producing a bag having a short bottom fold, thereby economizing in the amount of paper necessary for the production of a paper bag of agiven length and in said patent special mechanism is described for producing such a short bottom bag.

. i A feature of the present invention resides in the production of a compartment bag in which the seam wall consists of two plies of paper, one of said plies provided with a tab, which tab is tucked into the bottom fold and serves to hold the seam wall down and preventing it from following the paste bar when the latter is withdrawn after applying the line of paste'for the bottom flap.

The invention will be better understood by ref- 1 erence to the following description taken in conside of the bag shownin nection with the accompanying drawings in which- Figure 1 is a longitudinal section of an ordinary bag machine similar to that shown in my, said patent; v V

Figure 2 is a more or lessdiagrammatic view showing the method of applying paste lines to the paper web and the manner offolding the'web to produce a compartment bag;

Figure 3 is an enlarged sectional view of the bottom forming mechanism;

Figure 4 is a bag tube section before the bot-' tom is folded over and showing one way of folding the web to produce my improved compartment bag; a

Figure 5 is a similar view but showing a different way of folding: Figure 6 is a perspective view of tion of a complete bag; and

Figure 7 is a perspective view of the reverse Figure 6 and showing the top porthe bottom fold.

While the present invention contemplates an improved multiple compartment bag, it is not limited to such a bag. In its broader aspects someof the featuresof the invention are applicable to a single compartment bag.

Since in-ccmmercial production of bags of the type to which this invention is directed it is customary to make them on a bag machine, the invention will be better understood by reference to a well-known type of machine whereby my improved method is most efliciently carried out. Such machine may be of usual and well-known construction such, for instance, as that shown in my Patent No. 1,798,168 granted March 31, 1931. Y

Referring to Figure 1, there is the usual supporting framework 2 and running transversely between the side members thereof are a number of shafts which may be driven by a motor in a manner more fully described in my Patent No. 1,943,549 above referred to. In order that comparison between the structure shown in the which passes over a pulley ii on the shaft i6.-

The paper in the form of a web It is fed from a roll I! supported on a shaft 20'and' passes over suitable guide rollers and around a reversing roller 26 supported on shaft 21, This roller 'reverses the direction of movement of the web and such reversal provides a convenient time for applying paste to the web. In the ordinary single seam bag the paste is applied adjacent one edge of the web. In order, however, to produce a double com-' partment bag I apply two lines of paste. For this purpose I provide two narrow discs and 39 which dip into a paste pot 28. The disk 29 ap-' plies a line of paste adjacent the right hand edge of the web of paper as shown in Figure 2 while the disc 30 is spaced from the disc 29 and applies another line of paste to the web. This spacing of the discs may be varied to'suit the width of the compartment which is to be formed in the bag tube. and hence in the finished bag. It will be understood of course that the wider the compartment desired, the greater must be the overlap and hence a wider w'eb must-be used.

method consists in making slits in the web, in-

present application but is shown in Figure 2 of said Patent No. 1,798,168 and in Figure 12 of Patent No. 1,943,549. These slits are made by dies which are carried or supported by the shaft l6.

In the present invention, however, in addition to the dies for making the slits 50 I provide an additional die also mounted on the shaft i6 and indicated by the reference character 3|, Figure 1. This die is so shaped as to make a somewhat V- shaped incision in the web indicated at 33, Figure 2, of the present application.

The paper web, after passing over the roller 26 and having'been cut by the dies which form the slits 50, is delivered to the usual former mechanism which folds the web into a bag tube. This mechanism includes a former plate 36 supported by arms 32 extending forwardly and upwardly from the frame members of the machine.

The web of paper passes under the former and is folded over onto it as indicated in Figure 2. In making my improved compartment bag it is to be noted, that while a single ply of paper passes underneath the former the web is so folded over on to the former as to provide a two-ply bag wall on the upper side of the former. This is clearly indicated in Figure 2.

The folded tube then passes between feed rollers 34, Figure 1, which feed rollers operate in the manner described in said Patent No. 1,943,549. Beyondthe feed rollers the tube is momentarily retarded by the rotary members 39 known in the art as pinch bars. These are in fact rollers having segments set into a short portion of their periphery and geared together to rotate in opposite directions but at a peripheral speed which is less than that of the feed rollers 34.

-'Theleft end of the former as viewed in Figure 1 is provided with a serrated edge 40 which constitutes means for severing the under or single two-ply wall is severed by the edge 42 of the lip knife. As described inmyaforesaid patents and particularly-in Patent'No. 1,798,168, the slits 50 are made at bag length intervals apart and it will v be seen that the incisions 33 are likewise located at the same intervals so that when the striker bar severs the bag tube the transverse cut is made across the entire width of the bag tube by the former edge 40. The upper portion of the tube,

' however, is severed along a line connecting the ends of the cuts 50 and meets the ends of the incisions 33. The result of this method of severing the tube is to produce a tab 13 in one of the plies of the seam wall while producing a-corresponding notch 15 in the edge of the flap of the preceding bag-section. A bag section so severed and before the bottom is closed to form a finished bag is well illustrated in Figure 4. The notch 15 appears in the outer ply of the seam wall and furnishes ready means of access to the compartment formed between the paste lines." It will be also noted by reference to Figure 6 that the closing flap I4 is a two-ply flap between the paste lines and extends above the top edge of the front wall 11 and thereby provides ready access to the compartment formed by the front wall 11 and the ply 19. On the other hand, the notch 15 in the edge of the double-ply flap 14 provides ready access to the compartment formed between the 5 ply i9 and the ply 83. It is of course to be understood that the width of the compartment depends upon the distance separating the paste lines.

In Figure 5 a slight modification is shown in 10 which the ply 19 is folded on the top of the ply 83. The notch 75, it will be recalled, was formed in the ply 83 and at the'same time the tab 13 is formed at the bottom of the seam ply, which tab 13 is cut out of the top of the preceding bag 15 tube and forms a notch 15 in the closing flap thereof. No extra paper is needed to produce the tab I3 and. the notch 15 nor is there any waste of paper whatever in the production of the completed bag. 20 In the present invention I utilize the tab 13 in a manner which enables me to produce a short bottom without resorting to the use of a presser foot such as is shown and described in my Patent No. 1,943,549.

In bag machines generally and in this application likewise, the bag tube, after having been severed from the main tube, as indicated inFigbottom and this is done by means of a clamp and so tucker blade. Prior to the construction described in said Patent No. 1,943,549 it was necessary to fold the bag along the 'line H; Figure 14 of said patent, 'so that theupper or seam wall of the bag was engaged by the clamp. In said pat- 35 ent I have described mechanism whereby the bag bottom could be folded along the line b b, Figure 15, and thereby obtain a longer bag with the same amount of paper but insofar as I am aware, prior to the construction shown in said 40 Patent No. 1,943,549, difliculty was experienced if an attempt were made to fold along the line Y bb because the upper or seam wall of the bag not being held by the clamp there was a tendency for the upper wallto follow the paste bar 45 as the same was withdrawn after applying the paste line for sealing the bag bottom.

Inthe present invention 1 am enabled to fold the bottom along the line indicated by cc, Figures 4 and 5, by reason of the presence of the, 50 tab 13, which tab is caught in the clamp and holds downthe seam wall and I do not need to provide the presserfoot mechanism described in said Patent No. 1,943,549.

Referring to Figure 3, the shaft 56 carries the 55 cylinder to which is secured the tucker blade 65. The ,paste bar .53 is secured to a bar 66 urged radially outward by springs 12 and moved radiallyin proper timed relation to the progress well-known and which is described in detail in said last-mentioned patent. The lower cylinder 18 is mounted on the shaft 80 and carries a clamp indicated generally by 8| which is also operated in a well-known manner and is likewise fully described in said last-mentioned patent. In Figure 3 the tab (3 is shown as being tucked into the clamp by the tucker blade, thereby holding down the wall bf the bag at the time that the paste bar is withdrawn, thereby overcoming any tendency 70 of this wall of the bag to follow the paste barduring its withdrawal. When the bottom flap is folded over and pasted the tab 13 is included within the bottom fold. The bag section, after leaving the rollers 60 and 18, passes on to the u bottom closing mechanism shown at the extreme 2. A paper bag having a single ply front wall left 01' Figure 1, which mechanism is or usual and a double ply seam wall, a bottom closing 7 and well-known constructon. When the bottom flap which is a prolongation of said front wall eluded within the bottom told as clearly illustratsaid double ply seam wall having paste lines adflap is pasted to the seam'wall the tab 13 is inand folded over on tothe double ply seam wall,

seam wall, said flap extending beyond the top- 25 edge' of the front wall. a Y GEORGE w. POPlPE.

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