US2014497A - Machine for making paper bags - Google Patents

Description

Sept. 7, 1935. HASKELL 2,014,497

MACHINE FOR MAKING PAPER BAGS Filed June 10, 1953 s Sheets-Sheet 1 GUM/M411 6 Sept. 17, 1935.

H. HASKELL MACHINE FOR MAKING PAPER BAGS Filed June 10, 1955 3 Sheets-Sheet 2 Sept. 17, 1935. H HA KE L 2,014,497

MACHINE FOR MAKING PAPER BAGS Filed June 10, 1935 5 Sheets-Sheet 3 Fly. 4.

Patented Sept. 17, 1935 MACHINE FOR MAKING PAPER BAGS Howze Haskell, Richmond, Va., assignor to James River Paper Products, Inc., Richmond, Va.

Application June 10, 1933, Serial No. 675,303

4 Claims.

This invention relates to a machine for making paper bags. The type of bag which is made by the machineis the so-called square bag, particularly the kind of square bag which is made by folding an advancing sheet of paper along two longitudinal lines to divide it into a middle section and two lateral flaps, then cutting the tube so formed into lengths, and finally folding the lengths on a transverse fold approximately midway between their ends. This brings together the sections of each flap on the opposite sides of the transverse fold and they are pasted together by lines of paste previously applied to the paper. The bag so formed has no bottom seam, but only the two lateral seams where the flaps are joined.

Bags of the kind described have been made before,. but my invention aims to improve the machines for making this type of bag. The machines used heretofore for this purpose have been of the type employing reciprocating parts for folding the tube at the bottom fold. To avoid the noise and low speed of machines having such reciprocating parts, my machine is designed with rotary moving parts throughout.

The invention will be described with reference to one particular form of it illustrated in the accompanying drawings. In the drawings,

Fig. 1 is a plan view of the machine,

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1,

Fig. 3 is a detail radial sectional view of the folding rolls,

Fig. 4 150 a detail axial sectional view of one end of the folding rolls, I

Fig. 5 is a perspective view of a finished folded bag made by the machine, and

Fig. 6 is a similar view of the bag opened out.

The bags are manufactured from a continuous sheet of paper fed from a roll I rotatably mounted in supports 2 fixed to one end of a frame 3. The paper passes from the roll l to guide rolls l and 5, thence down to the folding table 6. Above the table 6 is mounted a forming plate 1 under which the paper travels and over which its lateral flaps 25 and 26 are folded by adjustable guides 8. The paper is drawn forward by feed rolls 9 and Ill driven through gears l l, I 2, l3, and a pair of gears M which interconnect the shafts of the rolls 9 and ill, only the upper one of the gears I l being visible in the drawings. On each side of the forming plate 1 is a post 2|] carrying a pivoted arm 2| which rotatably supports on its outer end a wheel 22. The wheel bears upon the paper and is rotated thereby. Due to its angular position the rotation of the wheel draws the paper 5 in against the forming plate making a smooth and uniform fold. The pressure of the wheel on the paper is controlled by an adjustable weight 23. This much of the structure of the folding table mechanism is old. 10 The tube is to be cut into lengths and folded on a transverse fold approximately midway between its ends, thus bringing one half of the tube length against the other half, with the flaps 25 and 26 inward. The two halves of flap 25 are to be pasted together to form one side seam 25 of the bag and the two halves offlap 26 to form the other side seam 25. For this purpose two continuous lines of paste 30 and 3| are applied to the parts of the paper which are to form the two flaps and 26. I prefer to apply these lines of paste by means of pasting rollers 33 located between the supply roll I and the guide roll 4. The pasting rollers 33 are supplied with paste from a roller 34 mounted on shaft 5|], this roller dipping 25 into a paste reservoir 35. Shaft 50 is driven through bevel gears 5|, 52, shaft 53, bevel gears 54, 55, the latter being fixed on the shaft of feed rollers Hi. The lines of paste-being on the opposite side of the paper from guide roll 4 are not affected by this roll. The guide roll 5 is on the paste side of the paper and to avoid smearing of the paste is provided with slots 36 which span the lines of paste. As the paper is folded over the forming plate, the paste lines appear on the upper side of the flaps 25 and 26. Smearing of the paste at the feed rolls is avoided by making the upper feed roll in two sections adjustable on their shaftto conform to the position of the paste lines. The folding table thus supplies a tube of paper 40 with two continuous lines of paste near the edges of the outwardly facing side of flaps 25 and 26.

Beyond the folding table is a cut-off mechanism for cutting the tube. into lengths of proper size to form the bags. The cut-off mechanism is of well known type and does not require detailed description. It comprises a revolving blade 40 mounted on a disc H fixed to a diagonal shaft 32. The shaft 52 is driven from the main drive shaft l5 through bevel gears l6 and ll. The

blade 40 swings past a stationary knife 45 and shears off the tube. An instant before the blade 40 comes into contact with the paper, the tube is squeezed by a pinch bar 46 mounted on a roller 41 and cooperating with a counterpressure roller 48. The speed of the tube is thus momentarily retarded, the pinch bar traveling somewhat slower than the feed rolls, and the cutting of the paper is thereby facilitated. To

avoid smearing the lines of paste 30 and 3|, the pinch bar roller 4! is divided into two sections adjustable on their shaft to conform to the position of the paste lines.

From the pinch bar the tube of paper passes between the folding rollers 68 and 6|, shown in detail in Figs. 3 and 4. The lower roller 68 is a clamp roller and has a slot 62 in its surface, in which is mounted a stationary jaw 63 and a movable jaw 64. The jaw 64 is fixed upon a rock shaft 65 pivotally supported in bearings in the end plates of roller 60. The outer end of shaft 65 has fixed to it an arm 66, with a roller 61 rotatably mounted at its end. The roller travels on a stationary cam 68 secured to the frame of the machine by screws 69. A spring (not shown) urges the jaw 64 toward jaw 63, the position of the jaw being determined by whether the roller 61 is traveling on the high part 10 or the low part II of cam 68. The upper roller, 6|, likewise has a slot 15 in its surface and in this slot is mounted a tucker bar 16. The tucker bar 16 is supported on a rod I carried by arms ||i| fixed to the shaft I02. Roller 6| is divided into two sections adjustable on shaft I82 to positions such that they will just avoid the lines of paste 30 and 3|. The tucker bar has slots 90 to bridge the lines of paste. The rollers 60 and 6| are driven by gears 80, 8|, 82, and a pair of gears, 83, interconnecting the two shafts of the rollers, only the upper one of gears 83 being visible. These gears drive the rollers at the proper relative speed to bring the tucker bar 16 and jaws 63, 64 into registry at each revolution. The cam 68 is shaped so as to bring the jaws 63, 64 toward the tucker bar in open position. Thus the tucker bar presses a small fold of the tube of paper between the jaws 63, 64 as they pass by. Immediately thereafter the arm 66 is released by cam 68 and the jaw 64 closes on the small fold of paper which it has received from the tucker bar. This is the fold which is to be at the bottom of the bag and is therefore situated approximately midway between the ends of the length of tube. The feed rollers 9 and I6 feed the tube between the rollers 60 and 6| for nearly half the length of the bag which is to be formed, before the pinch bar engages the tube, the remaining distance of feed being executed by the pinch bar to bring the approximate mid-line of the tube length into registry with the tucker bar and jaws of roller 60.

As the tube length is engaged by the jaws 63, 64, it is released by the pinch bar. At this moment half the tube length projects forward from the jaws and the other half rearward. As the jaws travel around they draw the tube length under an idler roller 85, which folds the forwardly projecting half of the "tube length over against the rear half. When the jaws have passed the roller 85 they are opened by cam 68, as shown in the dotted line position in Fig. 3, and the bag is fed the rest of the way by the friction between the rollers 85 and 66. The bag finally drops out into a receiver or conveyor and is ready to be pressed.

Having described my invention,

I claim:

1. In a bag making machine, means for supporting a paper supply roll, means for drawing the paper from the supply roll and feeding it forward, means for engaging the advancing sheet of paper to fold lateral flaps over the middle section thereof, means between said paper supply roll support and said folding means for applying two lines of adhesive to the paper near its edges on the side which is to be the outer face of said 10 flaps when the paper is folded, a guide roll for the paper between said adhesive applying means and said folding means, said guide roll being on the side of the paper to which the adhesive is applied and having slots therein spanning the lines of adhesive, means for cutting the paper transversely into lengths, and means for folding said lengths on a transverse line midway between their ends to bring the lines of adhesive on the two halves of each flap into-contact.

2. In a bag making machine; a folding table; means at one end of said table for supporting a supply roll of paper; a guide roll above said table at the supply end thereof over which the paper travels on its way from the supply roll to said folding table; means between the supply roll and said guide roll for applying two lines of adhesive near the edges of the paper to the side of the paper which is toward said guide roll, said guide roll having slots spanning said lines of adhesive; feed means for drawing the paper from said guide roll across said folding table; means on said folding table for engaging the advancing sheet of paper to fold lateral flaps bearing said lines of adhesive over the middle portion of the paper, with said lines of adhesive facing outward; means for cutting the folded paper into lengths; and means for folding said lengths transversely midway between their ends to bring the lines of adhesive on the two halves thereof into contact.

3. In a bag making machine, means adapted to engage a traveling sheet of paper to form it into a middle section and two flaps folded over the middle section; means for applying lines of adhesive to the outer faces of said flaps near the edges of the paper; means comprising complementary rotary members to engage the opposite sides of the folded paper to feed it forward, the rotary members on the adhesive side of the paper being adapted to engage the paper at the sides 5 of said lines of adhesive; means for cutting the paper into lengths; a clamp roller and a tucker bar juxtaposed in position to receive between them the lengths of paper from said feeding means; means for rotating said clamp roller and said tucker bar, said tucker bar being recessed to bridge said lines of adhesive and being adapted to engage each length of paper midway between its ends to press a transverse fold thereof into the clamp of said clamp roller; and means 00- operating with said clamp roller to press together the two halves of the length of paper on opposite sides of said transverse fold.

4. In a machine for making paper bags, positively driven means for drawing paper from a supply roll and feeding it forward; means for folding over lateral flaps onto the middle section of the sheet of paper as it travels forward; means for applying a line of adhesive to the outer face of each flap adjacent the edge of the paper; a clamp roll and a tucker bar juxtaposed to receive between them the paper as it is fed toward them from said feeding means; means for rotating said clamp roll and tucker bar in timed relation so that the tucker bar enters the clamp oi said clamp roll in each rotation; means for severing the paper into lengths; said feeding bar and clamp roll for a distance such that said tucker bar engages each length of paper midway between its ends and presses it into the clamp of said clamp roll to form a transverse told dividing the length of paper in half; and means cooperating with said clamp roll to press together the two halves of each length of paper, whereby the line of adhesive on one half of each flap is brought into contact with the line of adhesive on the other half of the same flap to form the side seams of the bag.

HOWZE HASKEIL.

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