US2333440A - Bagmaking machine - Google Patents

Description

Nov. 2, 1943. A. POTDEVIN BAG MAKING MACHINE s Sheet s-Shee t '1 Filed Jan. 17, 1-940 I ma INVENTOR W dZZr/a ATTORNEYS Nov. 2, 1943. A. POTDEVIN BAG MAKING MACHINE 3 Sheets-Sheet 2 Filed Jan. 17. 1940 m Q vf m INVENTOR ATTORNEYE s 5 Nov. 2, 1943. A. PCSTDEVIN BAG MAKING MACHINE Filed Jan. 17, 1940 INVENTQR Wm ATTO RN EYS Patented Nov. 2,- 1 943 2.333.440 BAGMAKING moms Adolph Potdevin, Garden City, N. Y., assignor to Potdevin Machin e Company, Brooklyn, N. Y., a

corporation of New York Application January 17. 1940, Serial No. "314,222

a 6 Claims. This invention is directed to the making of bags, and is more particularly directed to the makings of bags wherein, when desired, the'bag is heat sealed before bottoming. This method is particularly well adapted for use in connection with the making of bags from cellulose acetate,

cellulose hydrate, glassine and the like, in that theapplication of heat to such materials enables the same to be fused for the purpose-of providing a heat seal.

Each (if these rollers carries a cutting knife 8 which cooperates with a plate It slidably carried by the former plate. The function of the members 8 and III ispartially to divide the tubing 2 into bag lengths transversely of the tubing, as shown at l2 and I4 in Fig. 7. During the operation of the members-8 and III the leading portion of the tubing extends between the rollers l8. As the tubing advances beyond the rollers More specifically the present invention provides apparatus for making bags, wherein the,

ous through the machine it is tubed and divided into bag lengths to provide a paste lip at the end to be bottomed. When desired the end to be bottomed may be heat sealed before bottoming, and the open end of the bag length trimmed. The finished bags are stacked as they are discharged making material moves forward continufrom the end of the machine,

The accompanying drawings illustrate one form of apparatus suitable for; practicing my invention.

Fig. l is a somewhat diagrammatic view in elevation of the entire machine;

Fig. 2 is a view similar to Fig. 1 but on a larger scalewith many of the parts in section; a

Fig. 3. is a plan-view taken substantially in the plane 3-8 of Fig. 2; I

Fig. 4 is a fragmentary view in partial section of the heat sealing mechanism;

Fig. 5 is a part sectional elevational view of the heatsealing and bottoming mechanisms;

Fig. 6 is a plan view of Fig. 5;

Fig.7 shows in plan, for purposes of illus-- tration, the several steps which may be involved in division of tubing into bag lengths;

.Fig. 8 shows a sealing;

Fig. 9 shows the bag length of Fig.8 in proc ass of being bottomed; and V Fig. 10 shows the completed bag.

Referring to the drawings in detail: The bag making material, cellulose acetate, cellulose hy-. drate and like material, may be taken from any:

suitable source of supply and is moved continuously forward through the machine- As it passes ,into, the machine adhesive is applied thereto so that as it advances through the tubing mechanism it is formedinto a tube. This is well-knownpractice, and has not been illustrated. The tubed material, designated 2, continuously advances between a pair of forwarding rollers 4 and from thence to-a pair of rollers 6.

bag length in plan after heat from a supply roll, and as it advances I8 it passes between rollers I8 and 20, the rollers I8 carrying cutters 22 while the rollers are smooth faced The machine is sotimed' that when the perforated areas of the tubing reach a position between the rollers i8 and 20, the cutters 22 will have rotated to operative position to cut through the tubing 2 at the edges, as shown at 24in Fig. 7, thereby to complete the severing or dividing operation. A bag length as thus provided is shown-in Fig. 7 where it has been designated 28.

The next step in the-practice of my invention may be to trim the trailing end of each bag length, it being apparent from the drawings that at this stage each end of the baglength is provided with a projecting lip. The lip at the leading end, ,which is later to be used as a paste lip, has been designated 21, the lip at the trailing end has been designated 28. When the trailingend of each bag length is to be trimmed, I provide upper and lower driven shafts 28 and 30, respectivelygbeyond the rollers i8 and 20. The shaft 28 carries a plurality, of spaced discs 32 which in turn carry a trimmer plate or knife 34 pro- Jecting from the periphery thereof. The trimmer knife cooperates with the surface of an anvil cylinder 38' which is carried by the lower shaft 30,

' to cut off or trim the'trailing end of a bag length when the same passes between the discs and cylinders. In Fig. '7 I show the bag length 28 I with the end 88, including the lip 28, severed or trimmed therefrom. The discs 82 are adjustably secured to a disc 40 on the shaft 28soas to permit of adjustment of the discs circumferentially to adjust the trimmer knife, as will be under- '-stood. 1 i

When the trailing ends of bag lengths are trimmed as above outlined, I provide means for eflecting positive discharge of the trimmed o severed ends 88 of. the baglengths. As will be seen from the drawings, the periphery ofthe' anvil cylinder 88 is provided with a slot 42 extending longitudinally thereof. Within the cyl-' gthwise thereof below the,

inder and extending len slot 42 is a. rod 44. This rod carries a clamp or gripper law 48 which extends radially of the eyi.

inder into the slot 42. One end of the rod 88 carries an arm 4e, provided with cam follower roller 80 which follows fixed cam 82. The cam 82 is set so that with the parts as shown in Fig. 2 the gripper 48 is closed by spring 8!. On rotation of the cylinder 38 through an angle of about 180 the gripper jaw 18 will open.

The discs 32 above referred to carry a tucker plate 88 which trails the trimmer blade :4,

plate providing for tucking the material of the assa-iso 84, above referred to. This cylinder is provided in its periphery with a longitudinal slot 98. Extending into this slot is a'movable gripper Jaw 88, closed by a fixed cam I and opened by a spring I02. The movable jaw 88 cooperates with a fixed Jaw I04.

' As above pointed out,'the plates" which lie beside the plates 88 project slightly beyond the trailing end of the bag length between the gripper it and the side of the slot l2, so that as the piece 08 is trimmed off the trailing end of the bag, this piece will be gripped to the cylinder 38 and becarried around with it for about a half 'turn, when the gripper opens, leaving thevpiece 38 free-to fall out by gravity. Further to insure that the trimming 38 will leave the cylinder '88 as the gripper 48 opens, I provide a rotary brush 88 ad- Jacent to the bottomof the cylindet. This brush is rotated oppositely to and in contact with, the

cylinder I8 so as to brush the trimmings 08 from the cylinder, as will beapparent.

Beyond the trimming mechanism are a pair of transfer rollers 80, the bag lengths passing between these rollers, then across a plate 82 into position to be picked up by the mechanism which transfers the bag lengths to bottom clamp cylinder 8|, this mechanism being so constructed that the bag lengths -can be heat sealed,when desired before bottoming,

Referringto this mechanism, 84 designates a driven shaft extending transversely of the machine. Fast-on this shaft, adjacent the ends thereof, are a pair of rotors 88. Extending from' the ends of one rotor to the en of the other rotor are plates 88 capable of be! g electrically heated. The commutator and b'rushes'for th se plates "are designated I0 and 12, respectively. Cooperating with the outer face of each hot plate or heating element is a clamping and presser jaw I4. Each presser jawis carriediby. a rock shaft I8. Each of these rock shafts carries arms I8 and 80. Each arm 18 carries a cam follower roller 82 which cooperates with an internal, fixed cam 84, for closing the jaws I4. The arms 80 carry springs for opening the laws. Beside each heating elementis a plate 8.8 proiecting:

slightly beyond the outer face of each heating element. The outer face of each plate -88 is knurled, as illustrated at 00, and, if desired, the

\ face of each jaw-I8. Y

The machine is so timed that, as the leading end of "each bag length passes beyond the plate 82 in the forward advance of the ba length one end of therotors as with the jaw 14 and plcte 88 in open position will be. rotated into position so that the end of the bag length will enter beface of the same, so that when the clamped end of the bag length comes up to the'bottom clamp cylinder 84, the material of the bag length Just to the rear of the clamping jawll will be tucked by the plate 88 between the gripper 88 and fixed jaw I04, the presser' Jaw I4 opening at the same instant, thereby to transfer the bag length to the bottom clamp cylinder 84.

The past paste-applying bar I08 receiving its paste from past? roller I08, this bar applying a stripe of paste I I0 to the bag length transversely thereof. As'the rotating bottom clamp cylinder advances, the bag length, clamped to the cylinder 84 to the. rear of its leading end H2, is carried .around until the gripper 88 is about abreast of the driven bottom folding roller Ill, whereupon the end of the bag length is released and passes between this roller and fingers II8, the latter being' mounted on a bar II8 extending transversely of the machine. As the end of the bag length passes under the roller Ill the turnedbaolr'end II2 of the bag length including the paste lip 2'Iwill be pressed down upon'the ad- I hesive stripe 0. The line along which the turned-back end I I2 is foldedis designated II! in Fig. 8. The bottomed bag length then passes between delivery roller I20 which forward the same to delivery cylinder I22.

The delivery cylinder I22 is provided with a plurality of grippers I24, each of which is camopened and spring-closed, by cams I28 and springs I28, respectively]; The bag lengths are advanced, by the rollers I20 previously men-' ti0ned,-along the plate I30, and as the end of each length projects beyond the plate it is gripped The gripper cylinder carries the bottomed bag lengths to the deliveryv by one'of the grippers I24.

station I02 where the bags are stacked in a stack I88. A finished bag is illustrated in Fig. 10

' where it has been designated I38.

tween the jaw and plate, and the Jaw will close under the action of the cam 04, to attach the bag length to the rotors. If the bag length is to be heat sealed the circuit tothe plate 08 is closed so that the material of the bag length as it is transferred to the bottom clamp cylinder 84, suspended from the rotors, is heated .and fused to provide ,a heat seal 82 across the bag length,-as seen'ln Fig. 8, where the plate 88 contacts the material of the bag length. While good results :are obtainedif the face of the plate 80 and/or the face of the law-H be smooth, even better results are obtained if either or both of these facesbe knurled.

Each baglength 28 suspended from the rotors is moved forward forabout a half 'turn' of the rotors 88 until picked up by the bottom clamp cylinder trimming the trailing end of each bag length, heatsealing mechanism for heat sealing the opposite end of each bag length, and bottoming mechanism for bottoming the heat sealed ends of "the bag lengths, the'heat sealing mechanism delivering the heat-sealed bag lengths to the bottoming mechanism.

2Q Bag making apparatus comprising mechanism for dividing bag making material into bag lengths, forwarding mechanism for the bag lengths, heat sealing mechanism'fo'r heat sealin the fiat unfolded leading end of each bag length as the bag lengths are in transit, said heat sealing mechanism comprising a pair of rotors carrying a hot plate, gripper laws for gripping the flat unfolded leading end of each bag length at the area bag length is carried by the cylinder 84 to be heat sealed, and pressing the same against the hot plate for sealing the opposed walls of the bag length to each other, and bottoming mechanism for picking up the sealed bag lengths from the sealing mechanism at the sealed end.

3.-Bag making apparatus comprising mecha-' the area to be heat sealed, and clamping thesame against the hot plate for the sealing operation, and bottoming mechanism for picking up the heat-sealed bag lengths from the heat sealing mechanism.

4. Bag making apparatus comprising mechanism for dividing bag making material into bag lengths, forwarding 'mechanism for the bag lengths, heat sealing mechanism for heat sealing one end of each bag length in transit, said heat sealing mechanism comprising a hot plate, gripper jaws for gripping the end of each bag length at thearea to be heat sealed and clamping the same against the hot plate for the sealing opera tion, means for advancing the sealed bag length, and bottoming mechanism for picking up the heat-sealed bag lengths from the heat'sealing' mechanism at the heat-sealed ends of the bag lengths.

5. Bag making apparatus comprising mechanism'for dividing bag making material into bag lengths, forwarding mechanism for the bag lengths, a bottoming cylinder, means for delivering the bag lengths from the forwarding mechanism to the bottoming "cylinder, said-means comprising v a pair of rotors, gripper Jaws carried tion on said shaft and afiixed thereto, so as to thereby, said jawscomprising a fixed jaw and a movable jaw, a cam for positively actuating said movable Jaw, a plate lying beside the fixed jaw adjacent the jaw opening, said jaws as the rotors are actuated carrying the leading end of the bag lengths to the bottoming mechanism with each bag length suspended from the rotors by said jaws, gripper jaws carried by the bottoming mechanism, saidfplate tucking the bag lengths into said last mentioned gripper jaws to transfer the bag lengths to the bottoming mechanism as the first mentioned gripper jaws are automatically' opened.

6. In bag making apparatus comprising mechanism for forwarding bag lengths and bottoming mechanism, t'ransfer mechanism for transferring the bag lengths from the forwarding mechanism to the bottoming mechanism, said transfer mechanism comprising in combination a shaft extending parallel to the axis of rotation of the bottoming mechanismya pair of rotors in spaced relarotate therewith, a pair of gripper jaws carried by said rotors and extending transversely of the machine from the outer end of one rotor to the outer end of the other rotor, cam mechanism for i operating said jaws as the end of a bag length comes up to the transfer mechanism, thereby to grip the bag length at its leading end to suspend the bag lengths successively. from the rotors, and gripper jaws carried by the bottoming -,mechanismadapted to receive and grip the leading end of each bag length to the rear of they said previously gripped portion of the bag as the rotors bring the same adjacent the bottoming mechanism, thereby to-eflect transfer of the bag

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