US2126921A - Bag making machine - Google Patents

Description

Aug. 16, 1938. A. POTDEVIN BAG MAKING MACHINE Original Filed March 14, 1935 2 Sheets-Sheet l um I INVENTOR BY p 0 wflzlzzy ATTORNEYS,

Aug. 16, 1938.

A. POTDEVIN,

BAG MAKING MACHINE Original Filed March 14, 1935 2 Sheets-Sheet 2 NVENTOR Patented Aug. 16, 1938 PATENT OFFICE BAG MAKING MACHINE Adolph Potdevin, Garden City, N. Y., assignor to Potdevin Machine Company, Brooklyn, N. Y., a corporation oi New York Original application March 14, 1935, Serial No.

Divided and this application August 20, 1936, Serial No. 96,914

4 Claims. (Cl. 938) This invention is directed to an improved method and apparatus for making bags and is particularly directed to the making of bags of the satchel bottom type from cellulose or other light-weight material.

The present application is a division of my copending application Serial No. 10,968, filed March 14, 1935, Bag making machine.

Primarily the present application is directed to a method and apparatus for cutting and creasing a bag tube preparatory to the formation of the bottom thereon.

In the accompanying drawings:

Fig. 1 is a sectional elevational view of the cutting and creasing mechanism for operating on the bag tube before the same reaches the bottoming drum;

Fig. 2 is a plan view of the mechanism of Fig. 1;

Fig. 3 is a sectional elevational view of improved cross-scoring mechanism;

Fig. 4 is a view in part sectional elevation of mechanism which engages or grips the leading end of a bag length as the same comes up to the bottoming drum;

Fig. 5 is a part sectional elevational view of another form of cross-scoring mechanism;

Fig. 6 is an elevational view of the mechanism of Fig. 5; and

Fig. 7 is a view of a bag length after it has been slit at the lip or leading end and as it appears after being scored by the scoring mechanism of Fig. 3, for instance.

Referring to the drawings in detail, the material to be handled by the present apparatus is taken from a roll in the usual fashion and fed through tubing mechanism which forms the web into a tube. The tubed material is designated I.

The tubed material is advanced continuously and in a continuous length and is divided into bag lengths by the mechanism shown at 2. This mechanism is similar to the cutting of! mechanism constituting the subject matter of Paul Hunziker copending application Serial No. 647,502. However, the cut-off mechanism may be of any conventional construction. The cutting of! mechanism cuts the tubing into bag lengths leaving a lip 3 at the leading end of the bag length or bag blank and a lip 4 at the trailing end. A, bag length is shown in Fig. 7 where it has been designated 5.

During the cutting off operation the tubing is engaged by pinch rollers 6 and l and lies at this time between the upper face of a plate 8 and adjustable hold-down fingers 9 carried by rods I0 secured to the machine frame.

As the tube is divided into bag lengths the leading end of each length passes between slitting and scoring mechanism shown at II and I2 in Fig. 1 to slit the leading end of each bag length through both walls thereof as shown at A and B in Fig. 7 for instance and to cross score the bag length as shown at CS in the same figure.

In the usual bag machine for converting ordinary bag paper into bags, it is usual to equip the machine with a cylinder having a longitudinal groove therein cooperating with a scoring knife in an opposed cylinder to cross score the bag tube or bag length for the main bottom fold. Owing to the natural springiness or elasticity of materials such as cellophane for which my machine is particularly well adapted such cross scoring mechanism fails to score the bag length satisfactorily and if, in order to obtain a well defined score with such mechanism, the parts are set closer together than when handling ordinary bag paper there is always danger of cutting the material instead of scoring it with a resultant increase in waste of material. The present invention provides for eliminating these difficulties.

As clearly shown on the drawings, particularly Figs. 2 and 3, the scoring mechanism of. this invention comprises a thin scoring blade I3 preferably mounted on a shaft I4 rotatably adjustable in discs I5 on a shaft IS. The discs I5 are adjustable circumferentially of the shaft I6, as will be apparent from Fig. 2. The scoring blade I3 which depresses the bag blank or bag length out of the plane of the surface of the blank in a transverse area cooperates with a cam-and-spring operated movable jaw I'I carried by a shaft I8 having bearings in the end walls of a circumferentially adjustable disc cylinder I9 mounted below the discs I5 on a shaft I9.

The cam and spring for operating the jaw I! are designated 20 and 2 I, respectively. The lower disc cylinder I9 carries an abutment 22 which cooperates with the movable jaw H, the abutment and jaw constituting compression jaws. The face of the jaw I1 is cut back at an angle as seen in Fig. 3 and in operation the blade [3 depresses the wall of the bag length between the jaw I! and abutment 22 before the jaw closes and inasmuch as on continued rotation of the discs I5 and lower cylinder I9 the blade I3 is withdrawn the blade is followed up by the jaw I! which sharply grips the tucked-in portion of the bag length at'the apex 23 only, as seen in Fig. 3, instead of the entire face of the jaw clamping the material between it and the abutment 22 in a manner similar to that employed in clamping devices generally scoring CS is prevented.

used heretofore. By sharply pinching only the apex 23 of the tucked-in portion of the bag length I provide a permanent transverse or cross score CS in the material despite the natural springiness or elasticity of the same. At the same time I avoid cutting of the material so as to eliminate all waste from the cross scoring operation.

Two of the discs I5, which in addition to being adjustable circumferentially are adjustable longltudinally of the shaft I5, are provided with slitting knives 24 for slitting the bag lengths at A and B, these slitting knives as will be seen from Fig. 1 being adjustable circumferentially relatively to the shaft I6 and cooperating with the lower discs l9 which are also adjustable longitudinally of their supporting shaft I9 so as to adapt the machine for proper adjustment to slit bag lengths of different'sizes, as will be understood.

The slitting operation, as will be seen from Fig. 1, precedes the cross scoring operation.

During the slitting and scoring operations the bag length underlies adjustable hold-down fingers 25 carried by vertically extending posts 26 mounted on the machine frame.

Inasmuch as there is no other operation to be performed at this point the scoring clamp I1 releases the tube immediately after the cross scoring operation is completed and the bag tube is forwarded by the rotated scoring mechanism to the next station of operation between discs 21 and cooperating lower cylinder 28, passing between hold-down fingers 25 and plate 29.

As the leading end of the bag length reaches r this next station of operation the cam-and-spring operated gripper 30 carried by one of the discs 21 takes hold of the upper ply of the bag length at the point 3I, Fig. 7, between the slits A clamping it against a cooperating abutment 32 on a shaft 33 on which the discs 21 are mounted.

As the bag length passes between the discs 21 and the cylinder 28 the gripper 30 will be in open position-as shown in'Fig. 4, so that the nose of .the gripper will enter-the open end of the tube, and the projecting lip 3 on the lower wall of the tube will be' pushed downwardly, as illustrated in Fig. 4, bending the same over the edge of an abutment 34 on the shaft 35 carrying the lower cylinder 28. This portion of the lower wall of the tube springing back against the back of the gripper30 as the gripper clamps or grips the upper wall of the tube against the abutment 32. The abutment 34 is adjustable circumferentially of the shaft 5, as will be seen from Fig. 4.

Pivotally mounted on the discs 21 is a shaft 36 carrying a blade 31. One end of this shaft. 36 is equipped with a lever and cam follower roller 38 and with a suitable spring 39 to keep this roller in contact with an adjustable stationary cam 40. The function of the cam 4|] is to cause the blade 31 to swing outwardly beyond the periphery of the discs 21 at the proper instant to push the scored area of the bag length away from the surface of the discs 21 and toward the large bottom opening drum H which carries grippers-52 for gripping the lip 3 of the bag length. Intliis way pulling open the bag length beyond the cross The gripper 30 heretofore referred to is mounted on a shaft 42 and is controlled by a cam 43.

The hold-down fingers 25, referred to above, extend from a point at the rear of the slitting and scoring station to a point between the discs 21 and cylinder 28.

Between the scoring station and the station just referred to I provide a rock shaft 44 carrying fiat spring-like fingers 45 extending forwardly and downwardly between the hold-down fingers 25. Theshaft 44 is rocked by a cam 46, cam follower 41 carried by the shaft 44 being held in engagement with this cam by a spring 48. The fingers 45 remain in a raised position during the progress of the tube 5 from the scoring station to the gripper or clamping station un til the lip 3 on the leading end of the tube or bag length has been gripped by the grippers on the bottoming cylinder M, at which time the cam 46 will be in position to move these spring fingers 45 downwardly toward the lower guide plate 29 to hold the tube or bag length with a slight spring pressure against the guide plate, the spring fingers continuing to hold the bag length in contact with this plate approximately until the gripper 30 is ready to release the leading end of the upper ply of the bag length, it being borne in mind that the leading end of the upper ply of the bag length is gripped at this time by gripper 30 as above explained.

The fingers 45, therefore, exert a slight frictional hold-back action upon the bag length 5 during the first stages of opening the leading end of the bag length in the bottoming operation, thereby insuring that the bag length 5 will lie fiat on the bottoming drum 4| so that the previously made score CS will always be in the cor,- rect position for the blade 31 to act on as previously claimed.

In Figs. 5 and 6 I have shown a modified form of cross scoring mechanism, the cross scoring blade I3 instead of being mounted on an adjustable shaft I4 is mounted in the discs I5 on the shaft I6. The cross scoring blade is adapted to be reciprocated vertically in the discs I5 by springs I05 and cam I06. The scoring jaw I1 is cam-and-sp'ring operated and, as in the case of Fig. 2, this jaw Il' cooperates with an abutment 22'. The parts are so timed and discs I5 and I9 are so relatively positioned that as the scoring blade I3 is brought into position to engage a bag length 5 the scoring blade will be in its outermost position in the discs IS, the blade at that time riding on the high partof the cam I06. As the parts reach'the position shown in Fig. 5 or on a slightly further advanced position than shown in this figure, the cross scoring blade I3 will ride off the high part of the cam I06 so as to be moved inwardly of the discs I5 by the action of the spring I05, permitting the jaw IIf to close on the material of the bag length which has been inserted between the jaw I1 and the abutment 22' by the cross scoring blade to allow the jaw to grip the apex of this depressed portion of the bag length as described in connection with my description of the apparatus shown in detail in Fig. 3. In other words, just as the cross scoring blade I3 is retracted out of the space between the jaw I1 and abutment 22' the jaw will close.

It is to be understood that the construction and operation of the bottomingmechanism constitutes no part of the present application, the same beingshown, described and claimed in my copending application Serial No. 10,968 of which the present application is a division;

What I claim is:-

1. In a bag machine, the combination of cutting-off mechanism for dividing continuously advancing bag tubing into bag lengths, hold-back mechanism following the cutting-off mechanism and cooperating therewith, slitting and crossscoring mechanism following" the hold-back mechanism, and hold-down fingers for engaging the upper face of the bag lengths in their passage to the slitting and scoring mechanism.

2. In a bag machine, cross-scoring mechanism comprising in combination a scoring blade for depressing the area of a bag blank to be scored and a pair of scoring jaws for receiving the depressed area of the blank, the active face of one of said jaws being sloped away from the other jaw whereby only the apex of the depressed portion of the bag blank will be gripped by the jaws.

3. In a bag machine, cross-scoring mechanism comprising in combination a shaft extending transversely of the machine, rotatable means carrying said shaft, said rotatable means being circumferentially adjustable and said shaft being circumferentially adjustable in said rotatable means, a scoring blade carried by said shaft and adapted to be carried by said rotatable means into engagement with the face of a traveling bag blank to depress the bag blank in an area extending transversely of the blank, a pair of scoring jaws, rotatable means carrying said jaws, one of said jaws being pivoted, cam and spring mechanism for opening and closing said jaws, said cam and spring mechanism being so timed with respect to the timing of the scoring blade that the area depressed by the blade will be gripped by said jaws, the opposed or activefaces of the jaws being so shaped that only the apex of the depressed area of the bag blank will be gripped upon closure of the scorer jaws.

4. In a bag machine, cross-scoring mechanism for cross-scoring bag blanks comprising in combination scoring blade, rotatable means carrying said blade, a cam for moving said blade outwardly radially of said rotatable means, a spring for retracting said blade, a pair of scoring jaws cooperating with said scoring blade, rotatable means carrying said jaws, said scoring blade on the advance of a bag blank between said rotatable means being held in position by said cam so as to engage the bag blank to depress the same in an area extending transversely of the blank into position between said'jaws, said scoring blade being retracted by said spring on further advance of the bag blank to permit said jaws to close upon the bag blank, the active face of one of said jaws sloping away from the active face of the cooperating jaw so as to apply a squeeze to the depressed portion of the bag blank which is confined to the apex thereof.

ADOLPH PO'I'DEVIN.

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