US2191497A - Method of and apparatus for making bags and the like - Google Patents

Description

Feb. 27, 1940'- A. POTDEVIN ET AL METHOD OF AND APPARATUS FOR MAKING BAGS AND THE LIKE' 4 Sheets-Sheet 1 Filed Jan. 6, 1937 INVENTORS 47 a 41% M M ATTORNEYS Feb. 27, 1940. A. POTDEVIN ET AL 2,191,497

METHOD OF AND APPARATUS FOR MAKING BAGS AND THE LIKE Filed Jan. 6, 1957 4 Sheets-Sheet 2 INVENTORS m- ATTORNEYS Feb. 27, 1940- A. POTDE VlN er AL METHOD OF AND APPARATUS FOR MAKING BAGS AND THE LIKE Filed Jan. 6, 1937 4 Sheets-Sheet a INVENTORS W flax;-

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ATTORNEYS.

Feb. 27, 1940. A. POTDEVlN ET A 2,191,497

METHOD OF AND APPARATUS FOR MAKING BAGS 'AND THE LIKE Filed Jan. 6, 1937 4 Sheets-Sheet 4 ATTORNEYS Patented Feb. 27, 1940 UNITED STATES PATENT OFFICE METHOD OF AND APPARATUS FOR MAKING BAGS AND THE LIKE Adolph Potdevin,

Garden City,

and Paul Application January 6, 1937, Serial No. 119,218

11 Claims.

This invention is directed to an improvement in bag making machines, and has for one of its objects the provision of a bag making machine of new and improved construction capable of running at high speed with the maximum output and the minimum of waste material. Although not limited in its use to any specific material, the present machine by reason of its construction is particularly well adapted for the making of bags from materials such as Cellophane and .glassine and like materials which are very difiicult to handle with automatic machinery.

A further object of the present invention is the provision of new and improved mechanism for partially severing the web of material prior to the final dividing of the material into bag lengths. ti In the drawings accompanying this applica- Fig. 1 is a diagrammatic view illustrating an embodiment of our invention;

Fig. 2 is a side elevation of part of our improved machine;

Fig. 3 is an elevational view of the starting end of the machine;

Fig. 4 is a plan view;

Fig. 5 is a section on the line 5-5 of Fig. 3;

Fig. 6 is a section on the line 66 of Fig. 3;

Fig. 7 is a view taken on the line 1-1 of Fig. 2;

Fig. 8 is a view taken at right angles to Fig. 7;

Fig. 9 is a view somewhat similar to Fig. 1 of a modified embodiment of our invention;

Fig. 10 is a perspective view of a modified form of perforating mechanism;

Fig. 11 is a similar view of another modified form of perforating mechanism; and

Fig. 12 is a view of a completed bag.

Referring to the drawings in detail, 2 designates the roll of material, supported at the starting end of themachine, from which the bags are to be made. The material passesfrom this roll about idler rollers 4 and 6 and past pasteapplying roller 8 by which paste is applied to one edge of the web. The paste pot is shown at l0 and the roller which supplies paste to the pasteapplying roller 8 is shown at I2.

After the application of the paste, the web passes between forwarding rollers l4 and then beneath a tensioning roller l6, and then between perforating rollers I8 and 20, under another tensioning roller 22 and from thence to the tub-" ing mechanism where the web is tubed.

With reference to the tensioning rollers l6 and 22, each of these rollers is mounted in a frame comprising side members 24 which are disposed in parallel relation and secured to each other with the roller between them by rods 26. These side frame members are provided with rollers 28 and the assembly is mounted in end track plates 30 which are rigidly mounted on the machine and which extend upwardly substantially at right angles to the face of the web. It will be evident that with this arrangement each tensioning assembly is free to move freely on the. end plates 30 vertically thereof.

It will be equally apparent that each tensioning assembly merely yieldingly rests by gravity upon the upper face of the moving web.

As already pointed out, a tensioning device is provided at each side of the perforating rollers to insure the right amount of tension on the web at the time the same is perforated to enable the perforating operation to be performed properly, while at the same time the tensioning arrangement being yieldingly mounted will not impose too much tension on the web, thereby enabling the web to continue its advance through the machine, without danger of premature severing of the web.

The perforating operation is only the first step in severing the bag material into bag lengths, v

and as will be seen is performed with the bag material in the web and without interrupting the steady advance of the web. The final step in the severing operation is performed after the web has been tubed.

The perforating mechanism of this invention is of improved and novel construction. The usual perforating mechanism comprises a serrated knife bearing against a smooth faced roller. It is difficult to maintain such arrangement in good operating condition, owing to dulling of the knife. Our construction eliminates this difficulty. Referring to Fig.5 of the drawings, it will be seen that the perforating roller I8 is provided with peripheral circumferentially extending grooves 32. These grooves are in spaced relation along the periphery of the roller, their spacing depending upon the spacing desired of the perforations in the web. The upper roller 20 is equipped with a plate or knife 34 extending lengthwise of the roller. This plate is of course of any desired shape, depending upon the shape of the line of perforations to be made in the web. The perforated line in the web is shown at 36 in Fig. 4. g

The plate 34 is chisel edged, the working edge being smooth and unserrated, and as the same rolls into contact with the Brooved face of the roller I8 it will be apparent that the web lying between the two rollers will be perforated or punctured or cut through at the high spots 38 on the roller I8 between the grooves 32.

The advantage of this type of perforating mechanism as compared to the usual type where a plate with a serrated edge rolls into contact with a smooth faced roller is that the unserrated chisel edge of the plate 34 of this new arrangement permits the plate to be ground from time to time without impairing itsusefulness, whereas with the prior arrangement grinding soon removes the serrations entirely, necessitating replacement of the plate.

With the arrangement shown in Fig. 5 if it is desired to alter the spacing of the perforations in the web it is obvious that a new roller I8 with different groove spacing must be substituted for the one shown. To avoid the necessity of changing rollers every time the spacing of the perforations is to be changed, we may provide an arrangement such as illustrated in Fig. 10, for instance. In this construction the roller ill, which corresponds to the roller I3 of Fig. 5 is provided with three sets of grooved peripheral areas 42, the grooves of any one of these three sets being spaced differently from the grooves of the other two sets. The grooved areas are separated from each other by cutting away part of the surface of the roller, as shown at Mi. Consequently when it is desired to change the spacing of the perforations in the web being operated on, it is merely necessary that the roller 40 be shifted on its supporting shaft to bring the desired set of grooves 32 into operative position. It is understood, of course, that with this form of roller the cooperating roller will be the same as the roller 20.

In the modified form of perforating mechanism shown in Fig. 11 the roller 36, corresponding to the roller I8 of Fig. 5, is provided with a set of inserted blocks 48 projecting from the face of the roller, these blocks being spaced from each other circumferentially of the roller. The face of each of these blocks is provided with grooves 50 corresponding to the grooves 32 of Fig. 5,

the grooves in any one block being spaced difierc ently from the grooves in any of the other blocks. With this arrangement when it is desired to vary the perforations in a web being operated on it is merely necessary to rotate the roller 46 on its shaft or in its bearing until the proper block is brought into operative position. Again, as in the case of Fig. 10, a plate which we will designate 52 is provided in the face of the upper roller 54, this plate and roller corresponding, respectively, to the plate 34 and roller 26 of Fig. 5.

After leaving the mechanism so far described the web passes through the tubing mechanism, which may be of usual construction, except for two driven rollers 56 and 58, beneath which the material passes as it is tubed about the former plate 60. These rollers are driven about an axis which is oblique to the path of the traveling web, these rollers tending to draw or work the material about the former plate fill, thereby materially assisting in tubing the web.

The tubed material is now advanced between feed rollers 62, and a pair of rollers FM and 65 that when the tubing in its passage through the machine reaches the point where the perforations 36 reach a position between the rollers 64, 65 and the next set of rollers 66, 61, a longitudinal tension will be suddenly applied to the tubing to pull the tubing apart along the line of perforations therein, thereby to divide the tubing into bag lengths. v

The rollers 64 and 66 are so mounted in their bearings that the tubing is not pinched except when the severing operation is to be performed, that is to say,not until the perforations 36 in the travel of the tubing have reached a point between the rollers 64, 65 and the next set of rollers 66, 6?.

The arrangement by which the rollers Mr and 66 are brought into cooperative relation with.

'wardly toward their companion rollers by cam II! and moved upwardly away from their companion rollers by a spring I2. This bodily movement of the rollers is properly timed, as will be explained hereinafter, so that the rollers will be moved downwardly toward their companion rollers when the perforations in the tubing are in proper position for the completion of the severing operation.

After the severing or dividing operation has been completed the bag lengths are forwarded by cylinders I l to bottoming mechanism or other mechanism for finishing.

Power for driving our improved machine is taken ofi the main drive shaft I6. This shaft is equipped with gear I8 for driving a train of gears I9, and M which drivesth'e cylinders or rollers 68.

The overspeeded rollers 56 and '61 are driven from gear 82 on the same shaft as the gear 80, a gear 8 3 meshing with the gear 82 and in mesh with gear 86 on the shaft of the roller 61. This shaft also carries a gear 88 which meshes with gear89 on the shaft of upper roller 65.

Meshing with the gear 19 is gear 90 meshing with a gear 92. This gear 92 is mounted on shaft 94 carrying a sprocket and sprocket chain 96, the other end of this chain being carried by sprocket 98. On the end of the shaft I00 carrying the sprocket 98 is a gear I02 meshing with gear I04 in turn meshing with intermediate gear I06, driving gear I08 on shaft 0. This shaft carries one end of the chain II2 of a Reeves drive. The Reeves drives two gears IM and I It. The gear IIt drives gears II8, I20 and I22 to drive the rolls '62.

The gear i20 drives gear I26 in mesh with gear I28 on the shaft of lower roll 65, the gear I28 meshing with gear I30 to drive the upper roll 64.

The gear 92 above referred to meshes with gear H32 to drive gear I36 on the shaft I36 of one of the cams E0 the shaft of the other cam Ill being geared to this first mentioned shaft by through intermediate gear I it and gears I50 and i 52 drives the other wiping roller 56.

The perforating rollers are driven off the shaft iilfi which carries a gear I5 i meshing with gear I55 on the shaft I58 of the roller I8. The two each other circumferentially of the roller, and

rollers are geared together by a pair of gears Hill.

.The modification illustrated diagrammatically in Fig. 9 differs from the form already described in that a roller on theend of an arm I62 is adapted to engage the perforated tube of bag material at the tensioned area to assist in dividing the same as the tube is pinched by the rollers 64, '65 and 66, 61. The arm is rocked by cam PM on the shaft of roller 68.

It is to be understood that changes may be.

made in the details of construction and arrangement of parts within the purview of our .invention.

What we claim is:

1. In a bag making machine, means for effecting continuous forward movement of the bag making material, a perforator in the path of the bag making material for perforating the same, and means at each side of the perforator supported yieldingly by the bag material to place a slight tension on the same as the bag material is perforated.

2. In a bag making machine, means for efiecting continuous forward movement of the bag making material, a perforator in the path of the bag making material for perforating the same, and rollers mounted at each side of the perforator in position to rest by gravity upon the advancing bag material to be supported solely thereby so as to tension the bag material during the perforating operation.

3. In a bag making machine, means for continuously forwarding the bag material, a perforator for perforating the same, a rigid mount fwhich is provided at its periphery with a sub-.

at each side of the perforator, a frame in each of said mounts freely movable vertically therein, and a roller carried by each of said frames and extending transversely of the machine to rest by gravity upon the advancing bag material at each side of the perforator.

4. A perforator for bag making material, comprising in combination a pair of rollers, one of stantially non-rectilinear perforating strip, the points of the cutting edge of which are equidistant from the axis of its roller, the other roller being provided with spaced grooves ex tending longitudinally of the, roller, the face of the last mentioned roller. intermediate said grooves being provided with peripheral circum ferential grooves, the spacing of these last mentioned grooves at any one area being difierent from the groove spacing of the other areas.

' 5. A perforator for bag making material, comprising in combination a pair of rollers, one of which is provided at its periphery with a substantially non-rectilinear perforating strip, the

points of the cutting edge of which are equi-.

distant from the axis of itsroller, the other roller being provided with grooved areas spaced from each other circumferentially of the roller, the grooves of any one area being spaced differently from the grooves of the other areas.

6. A perforator for bag making. material comprising in combination a pair of rollers, one of which is provided at its perlpheryjvith a sub stantially non rectilinear perforating strip, the points of the cutting edge of which are equidistant from the axis of its roller; the other roller being provided with grooved insets in the face of the roller, said insets being space from the'grooves of vany one inset being spaced differently from the grooves of the other insets.

7. In a bag making machine wherein the bag material is advanced past ,perforating mechanism whereby the material is perforated at bag length intervals, means for tearing the web into bag lengths at the perforations, comprising two pairs of rollers in the path of the perforated material, means whereby one pair is overspeeded with respect to the other, and means for effecting bodily movement of one roller of each pair when vthe perforated bag material is intermediate the two pairs of rollers, to grip the material whereby longitudinal tension will be applied to the material to divide the same at the perforated area.

8. In a bag making machine wherein the bag material is advanced past perforating mechanism whereby the material is perforated at bag length intervals, means for tearing the web into bag lengths at the perforations, comprising two pairs of rollers in the path of the perforated material, means whereby one pair is overspeeded with respect to the other, and a driven cam for effecting predetermined bodily movement of one roller of each pair when the perforated bag material is intermediate the two pairs of rollers, to grip the material whereby longitudinal tension will be applied to the material to divide the same at the perforated area.

9. In a bag making machine wherein the bag material is advanced past perforating mechanism whereby the material is perforated at bag length intervals, means for tearing the web into bag lengths at the perforations, comprising two pairs of rollers in the path of the perforated material, means whereby one pair is overspeeded the same time to strike the tensioned area a sharp blow thereby to divide the material into bag lengths at the perforations.

10. In a bag making machine wherein the bag material is advanced past perforating mechanism whereby the material is perforated at bag length intervals, means for tearing the web into bag lengths at the perforations, comprising two pairs of rollers in the path of the perforated material, means whereby one pair is overspeeded with respect to the other thereby to impose a sudden longitudinal tension on the perforated area of the bag material, and a cam controlled arm operating in timed relation to the tensioning means to strike the tensioned area a sharp blow thereby to divide the material into bag lengths at the perforations.

' 11. A perforator for bag material, comprising in combination a pair of driven rollers, one of which is provided at its periphery with a substantially non-rectilinear perforating strip, the

" points of the cuttingedge of which are equidistant from the axis of its roller, the other of 1 said rollers being provided with circumferential peripheral grooves whereby the said perforat-

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