US2067017A - Machine for making bellows bags - Google Patents

Description

Jan. 5, 1937. G. w. POPPE MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1954 4 Sheets-Sheet l INVENTOR GIV/Pf h/ /0PP ATTORNEY Jan. 5, 1937. w, PQPPE 2,067,017

MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1934 4 Sheets-Sheet 2 INVENTOR GZW/Ff h/ Pap/ 5 ATTORNEY Jan. 5, 1937. G. w. POPPE. 2,057,017

MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1954 4 Sheets-Sheet 3 .52 I I INVENTOR 6f0fl6 Pa f ATTO R N EY Jan. 5, 1937. G. w. POPPE 2,067,017

MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1934 4 Sheets-Sheet 4 INVENTOR afaif W/Q f Q BY ATTORNEY Patented Jan. 5, 1937 FOR G BELLGWS BAGS George W. lPonpe. Brooklyn, N. Y assignor to Equitable Paper Bag 00., Inc... Brooklyn, N. Y., a corporation of New York Application June 21, 1934, Serial No. 731,621

3 Claim.

This invention relates to a machine for making bellows bags and its primary object is to make a bellows bag having a step cut-off at the bottom thereof, which machine shall be simpler in construction and employ less parts than mahcines for this purpose heretofore proposed.

Bellows bags made by cutting ofl sections from the folded web have long been in use and machines for making them have been highly developed. The usual practice is to feed a web of paper under the former of a bag machine, fold the bellows on top of the former and paste the free edges of the web to form the upper or seam wall of the bag tube. The edge of the former is provided with teeth or serrations and the lower bag wall is severed by engagement with said serrations. Both bellows folds and the upper or seam wall of the bag tube are severed by the lip knife. In making a bag tube in this way three thicknesses of paper must be severed at one time by the lip knife. Where relatively light paper is used for the bag tube this method may serve, but when relatively heavy paper is used the strain upon the lip knife is so great that a heavier type of machine must be employed.

The present invention contemplates the separate severing of the bellows fold or at least one ply thereof and the bag walls. In the specific embodiment of the invention, the former about which aweb of paper is wrapped to form a bag 2, is modified and the wing plates which form the bellows folds are utilized to sever the bellows folds thereby relieving undue strain upon the lip knife.

The invention will be better understood in detail by reference to the accompanying drawings in which:-

Figure 1 is a longitudinal section of an ordinary bag machine having one form-of my improvements embodied therein;

Figure 2 is an enlarged sectional view of the former and associated parts;

Figure 3 is a diagrammatic illustration of the manner of pasting the bottom of the bellows bag tube;

Figure 4 is a section on the line 4-4, Figure 1;

Figure 5 is a section similar to Figure 4 with some of the parts of Figure 4 removed to better show underlying parts;

Figures 6, '7 and 8 are sections on the lines 66, 1-4 and 8--8, respectively, Figure 1;

Figure 9 is a view of a portion of a modified construction of the former;

Figure 10 is a front view of Figure 9 looking in the direction of the arrow Ill;

Figure 11 is a section taken through the feed roller shafts and showing the bag tube in side elevation to illustrate the manner in which the bag tube is fed in relation to the former;

Figure 12 is a view similar to Figure 11 but omitting some portions of the bag tube to better show 5 the construction of the former;

Figure 13 is a top plan view of a portion of the machine adjacent the feed rollers showing a further modification, in which the wing plates which form the bellows folds are provided with serra- 10 tions to cut ofi one ply of the bellows;

Figure 14 is a section on the line lit-M of Figure 13;

Figure 15 is a section on the line lE-lt of Figure 14 and Figure 16 is a perspective view of a bag tube section made on a machine like that shown in Figures 13 and 14.

Before describing my particular improvements, some reference to the general construction of bag machines and the processes heretofore used in making a bellows fold bag may be in order. Referring, therefore to Figure 1, the machine in general includes side frames 2 which support a number of cross shafts whose function and mode 25 of operation will be later described.

A Web of paper E is fed from the roller 5 and after passing over guide rolls 6, l and 8 passes over a reversing roller I ll at which point a line of paste is supplied to the edge thereof by a paste 30 disc l2 mounted on the shaft l3 and rotating in a paste pot it supported from an arm l5 extending rearwardly from one of the side frames 2. The web of paper then passes downwardly and under the heel of a. former l6 supported centrally 35 from a post I8, which post depends from a cross bar 20 carried by forwardly extending arms 22 of the frame members 2. The web of paper passes under the former and is folded over onto it in the usual and well-known manner and the bellows 4.0 folds are made in it by the wing plates 24, better, shown in Figures 4 and 5. These plates form the bellows folds in the usual manner and the free edges of the web are overlapped and pasted as indicated in Figure 3. The bellows tube thus formed 45 passes under feed rollers 26 and thence to the usual pinch bars 28 which momentarily retard the tube to permit severance of the same by the striker bar 30 carried by a sprocket chain 3i passing over upper and lower sprockets 32.

All of the parts so far described are found in a usual bag machine designed for producing a bellows folded bag tube.

It has heretofore been proposed to sever the bag walls and the bellows folds by separate cut-, 55

ting means, thereby producing what may be called a step cut-off. In making the step cut-oil, the line of severance of both plies of the bellows fold may be oif-set from the seam wall of the bag or one ply of the bellows. fold may be severed along the line which is off-set from the line of severance of the seam wall, the other ply being severed along the line substantially coincident with the line of severance of the seam wall.

Figure 3 serves to illustrate both variations. The upper or seam wall' is severed along the line I3. The line of severance of the bellows folds is indicated at 34 and at least one ply of these folds is severed along this line and both plies may be so severed. The lower bag wall is severed along the line 35.

By the usual mechanism the bottom of the bag is folded along the line a--a, Figure 3, but the manner of pasting is different from that employed in an ordinary bellows bag. Lines of paste indicated at 38 and 31, Figure 3, are applied to the seam wall of the bag and when the bottom is folded along the line (1-0., one ply of the bellows folds is pasted along the paste line 36 while the lower bag wall is pasted along the line 31. This insures a very tightly pasted bag bottom.

Referring to Figure 2, the lip knife 34 is supported by a cross bar I! which lip knife serves to sever the upper or seam wall only of the bag tube but does not sever either ply of the bellows folds.

' In the construction shown in Figure 2 I provide a plate 42 spaced from the former by a wedgeshaped central rib 44 as shown in Figure 4. This plate 42 extends a slight distance beyond the edge of the lip knife and above the wings 24 which form the bellows. The bellows folds therefore are formed beneath the plate 42 but over the former 16. The latter is provided with the usuafser- ;rated edge 46 and the plate 42 is likewise proshown in Figure 4, the serrated edge 48 of the plate 42 may have its serrations extending inwardlya distance from the edge thereof equal only to the width of the bellows fold, although a continuous edge may be employed.

In order that the feed rollers 2| may properly engage the bellows folded bag tube the former I. and the plate 42 are bothcut away or recessed as shown at 50, Figure 5. Referring again to Figure 2, the lower wall of the bag is underneath the former, the bellows folds thereof are between the former and the plate 42 and the bellows folds of the bag are on top of the plate 42. Therefore, when the striker bar 30 delivers a blow to the under side of the bag tube the lower wall thereof is severed along the line 35 by the serrated edge 46 of the former and both plies of the bellows folds are severed along the line 34 by the serrated edge of the blade 42. The lip knife 3! severs the upper or seam wall of the bag along the line 33.

In the construction shown in Figures 9 to 12, inclusive, the lines of severance are the same as in the construction previously described.

In this construction, however, the former its is cut away more deeply at 50a, for a purpose which will presently appear, and the bellows folds are severed against the serrated edge or edges 46:: thereof. For severing the lower wall of the bag tube, a separate plate 52 is adjustably secured beneath the former and spaced therefrom a suitable distance to permit the bellows folds to pass between it and the former. Bpacing collars It are shown in Figure 10 and slots in the former or the plate I2 provide for adjustment of the plate relative to the former. The bellows folds are made by the wings 24 on top of the former but after the bellows has been formed the bellows folds are fed underneath the former and between it and the plate 52 as shown-in Figures 11 and 12. The lower wall of the bag is severed by the edge of the plate 52 and both plies of the bellows folds are severed by the former, the upper wall of the bag only being severed by the lip knife.

The deep recesses Ella in the former are formed in the manner shown to permit the bellows folds, which are above the former during the folding operation, to pass beneath the former prior to the cut-off operation.

Referring to Figure 13, the former lib is provided as usual with a serrated edge 48b and the feed rollers 26 are set on their respective shafts so that they are inside of the bellows folds. In this construction, theedge 48b of the former severs the lower bag wall but one ply of the bellows folds is severed by the wing plates 24a. To enable them to do this they are provided with serrated edges 54, Figure 13, which are of a width sumcient to properly sever one ply of the bellows folds, the lip knife severing the other ply thereof and also the top or seam wall of the bag tube.

The wing plates 24:: are supported from the side frames 2 by right angle brackets 56, Figures 14 and 15, and are slotted as indicated at 51, Figure 15, to permit longitudinal adjustment of the plates 24a to thereby vary the amount of offset of the cut-off affected by these plates. The plates are adjustable laterally in the usual manner, such adjustment being provided by slotting the plates as indicated at I! and providing a hand-operated screw it engaging a thread tapped in the bracket for holding them in adjusted position. Two of these adjusting devices are provided on each side of the machine as indicated in Figure 4.

Figure 16 shows in perspective the bottom of a bag tube severed by means of the mechanism described in Figures 13 and'14. To complete the bag, the bottom is folded along the line M and the bottom flap is pasted along the paste line 31 while the lower ply of the bellows folds is pasted along the paste line 3|.

The paste lines 38 and I! are applied to the seam wall of the bag tube by a paste bar ll carried by a cylinder 62 which cylinder also carries the tucker blade 3 which tucks in the bottom of the bag. The tucker blade 63 c0- operates as usual with a lower cylinder 64 which carriesthe usual clamp. The mechanism for tucking in and pasting the bottom differs from the usual mechanism commonly found in bag machines only in the fact that the paste bar III is provided with two paste applying ribs 65 instead of one such rib as is customary. The paste is supplied as usual from a paste pct 86 from which projects a roller OI. At every rotation of the cylinder 02 the paste bar 60 wipes against the roller 68 and takes off the necessary amount of paste to be applied to the bag tube wall. The bag, after passing the cylinder 62 and 64 is fed to delivery mechanism of the usual kind.

By reason of the adjustment provided by the slots 51, the amount that the line of severance 34 may be offset from the line of severance 35 may be varied. The lip knife may also be adjusted in the manner usual in bag machines,

being slotted at 61 for this purpose so as to vary the distance between the line of severance 33 and the other two lines of severance.

when the difference between the lines of severance is slight, the edge of the tube between the lines of severance is usually torn but for most bags this is not objectionable. However, in order to provide suflicient room to paste the bellows folds securely to the bag bottom, it may be desirable to make the oifset between the lines of severance 33 and 34 so large that the tear at the edge of the tube becomes objectionable. This difliculty may be readily overcome, however, by utilizing the web-cutting mechanism disclosed in my Patent 1,798,163, Figure 2. Preferably, slitter knives similar to those shown at 12, Figure 2 of said patent, may be utilized and these may be mounted on the shaft 'll,Figure 1. This shaft corresponds to the shaft 52 shown in said patent. It may be driven as shown in said patent from the lower pinch bar shaft 12. Since this mechanism is fully shown in said patent and also fully described therein, it is thought that it will be unnecessary to show the same in detail in the present application. For the purpose of making the present disclosure as complete as possible, however, it may be stated that the shaft 12 carries a suitable sprocket for driving a sprocket chain H, which chain passes about a sprocket 16 carried by shaft II. Shaft I8 carries a gear indicated in dotted lines I! which meshes with a similar gear 30 carried by a shaft 32. Shaft 82 carries a sprocket whichdrives a sprocket chain 84 which passes over a sprocket carried by the shaft 10. Sprocket chain 34 corresponds to the,

sprocket chain 35, Figure 2 of my said patent. By means of the slitter knives indicated at I,

Figure 1, the web may be provided with short slits x, :c and Figure 3, which are so located that when the tube is severed along the lines 33, 34 and 35, the slits a: will be located at the bag tube edges between the lines of severance 34 and 35 and the slits y will be located between the lines of severance-33 and 34.

What I claim is:

1. In a bag machine. the combination with a former about which a web of paper is adapted to be wrapped to form a bellows bag tube, wing plates adapted to engage-the tube and to form bellows folds'therein, one edge of each wing plate having cutting edges for severing one ply of the bellows fold.

2. In a bag machine, the combination with a former about which a web of paper is adapted to be wrapped to form a bag tube, of wing plates located adjacent the former and cooperating with the former to produce bellows folds in the bag tube, said wing plates having serrated cutting edges for severing one ply of the bellows fold, and said former having a serrated edge for severing one wall of the bag tube.

3. In a bag machine, the combination with a former about which a web of paper is adapted to be wrapped to form a bag tube, of wing plates located adjacent the former and so shaped as to produce bellows folds in said tube, said former having a serrated edge for severing one wall of the bag tube, said wing plates having cutting edges for severing one ply of the bellows folds, and a lip knife having a cutting edge for severing the other ply of the bellows folds and the other wall of the bag tube.

GEORGE w. POPPE.

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