US3833446A - Bag-manufacturing machine - Google Patents

Bag-manufacturing machine Download PDF

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Publication number
US3833446A
US3833446A US00201065A US20106571A US3833446A US 3833446 A US3833446 A US 3833446A US 00201065 A US00201065 A US 00201065A US 20106571 A US20106571 A US 20106571A US 3833446 A US3833446 A US 3833446A
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United States
Prior art keywords
drum
welding
machine
bags
grippers
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Expired - Lifetime
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US00201065A
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English (en)
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J Class
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Constr Mecaniques C & A Atel
Les Ateliers De Constr Mecaniques C & A fr
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Constr Mecaniques C & A Atel
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Publication date
Priority claimed from FR7043599A external-priority patent/FR2115747A5/fr
Priority claimed from FR7126954A external-priority patent/FR2146675A6/fr
Priority claimed from FR7139448A external-priority patent/FR2158750A6/fr
Application filed by Constr Mecaniques C & A Atel filed Critical Constr Mecaniques C & A Atel
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/005—Making flexible containers, e.g. envelopes or bags involving a particular layout of the machinery or relative arrangement of its subunits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/022—Holders for feeding or positioning sheets or webs
    • B31B70/024—Rotating holders, e.g. star wheels, drums

Definitions

  • ABSTRACT Van Horn Assistant Examiner-Caleb Weston Attorney, Agent, or FirmYoung & Thompson [5 7 ABSTRACT A bag-manufacturing machine wherein a tube unwinding from a reel is grasped by a set of rollers, passes into a cutting device with a notched cutter which reduces the resistance of the tube at the points determined by the length of the bags and permits the tube to be entrained, then each bag is successively pulled off by a train of rollers driven at higher speed, its bottom is welded, it is grasped by the mouth, cooled, and transferred onto a collecting drum which, by means of a set of grippers, grasps a certain number of bags which it deposits in a pack on a moving belt for removal.
  • the said bags or the like are made from a tube which is delivered in reels of the width of the bag to be obtained and is driven by a device which cuts the tube to the length of the desired bag and closes its bottom by welding by heat, then ejects it for removal, when completed.
  • the invention has for its object a machine wherein the tube unwinding from the reel is grasped by a set of rollers, passes into a cutting device with a notched cutter which reduces the resistance of the tube at, the points determined by the length of the bags and permits the tube to be entr'ained,'then each bag is successively pulled off by a train of rollers driven at higher speed, its bottom is welded, it is grasped by the mouth, cooled, and transferred onto a collecting drum which, by means of a set of grippers, grasps a certain number of bags which it deposits in a pack on a moving beltfor removal.
  • the machine retains all the elements of the first embodiment as described above, with the exception of the packet ejection device, which is replaced by another with higher performance, but their arrangement is different, especially in the obliquity of the path'of the band of material before its arrival on the sealing drum, which can vary between the horizontal and the vertical, the oblique position being preferable since it facilitates movement of the band by gravity, but the positionings of the unwinding reel and the bag ejection system correspond to those of the conventional machines.
  • the new arrangement necessitates the addition of a first transfer drum placed before the sealing drum, equipped with a suction device effecting the displacement of the previously cut bag. It possesses the considerable advantage of being surrounded by the same straps as those which surround the sealing drum and which have even been extended to the transport rollers, in order better to support and guide the band.
  • This new general arrangement presents the immense advantage of reducing the free space between the drive rollers and the sealing drum, which avoids blockages and thus wasted material and stoppage of the machine, when the material to be transported is heavily charged with static electricity.
  • the elasticity of the material to be transformed necessitates an auxiliary drive device permitting the feeding of j the machine with a band under constant tension, and
  • the grippers of the transfer drum of the first-mentioned version of the machine are advantageously replaced by a suction device.
  • the angular position of the Welding drum varies according to the length of the bags to be manufactured.
  • its drive is effected by means of a compensating gearing of unlimited stroke, controlled by a servo-motor.
  • the welding grippers are covered with a layer of Teflon which has the property of preventing adhesion of the molten plastic material to the metal.
  • This Teflon is subject to wear by reason of the very high speed of the machine according to the invention which instead provides grippers having cheap detachable elements which necessitate only a very short stopping time of the said machine for their replacement.
  • variable-speed chain-type ejection device as described in the first version of the machine has been considerably improved by the addition of a new device comprising a retarding drum on the said chain the speed of which is no longer variable but very slow.
  • Another improvement in the machine according to this second form of embodiment permits the automatic regulation of the welding temperature for each running rate, which avoids the tasks of monitoring and verification during the acceleration period of each restart of the machine.
  • the machine can advantageously be supplemented by numerous known devices, such as equipment for cutting out grasping handles permitting of manufacturing carrier bags, perforation equipment permitting of obtaining aerated bags, printing elements permitting of obtaining printed bags in a single operation.
  • the welding members with interchangeable elements can be equipped, by way of'anti-adhesion agent, with glass fibre fabric utilised in such a way that its thermal deterioration is retarded to such extent that its use does not constitute an impediment to the industrial exploitation of a high-speed machine of the rotary type. It is apparent that this considerable advance can be trans- 'ferred to the present-day low-speed machines which work on what is called the alternating principle.
  • FIG. '1 is an external view of a machine according to the invention, Y, i
  • FIGS. 2 and 3 represent a sectional view of the same machine, separated along'the line A A, on a different scale, v
  • FIGS. 4' and 5 represent diagrammatically a variant of embodiment of the machine and the arrangement of its various parts
  • FIG. 6 shows the angular. position of the welding drum as a function of the length of the bags
  • FIG. 7 represents the welding gripper with its detachable part
  • FIG. 8 represents the retarding drum and the dis charge chain
  • FIG. 9 is a section of the retarding drum
  • FIG. 10 is a perspective view of a packet of bags
  • FIG. 11 represents. the double cutter
  • FIG. 12 represents the perforating cutter
  • FIG. 13 represents the device for welding the holes
  • FIG. 14 is a lateral elevation of a variant of the weld ing device, the movable flap being equipped with glass fibre fabric, and
  • FIG. 15 is a view analogous with FIG. 14, the device being in the welding position.
  • the rollers 13 and 14 which in fact are rolls mounted on'the same spindle but separated bythe belts, have a higher speed equivalent to that of the welding drum'2l. This is the reason why at the moment when the segment of the roller 14 comes into contact with the roller 13, a section of the tube is detached by reason of the speed difference. This separation takes place by tearing off of the parts which were notcut because of the notchings of the cutter 8. This tearing off takes place only when the end of the tube is in the vicinity of the belt roller 22, just a little before the tube is gripped between the roller 22 and the drum 21. So that the section may arrive at this point without damage, it is accompanied in its course by the train of perforated belts 23 rotating at the same linear speed as the drum 2].
  • the said belts 23 pass beneath the suction box 24, the lower lid of which is perforated and in which a negative pressure is created with the aid of the pump.
  • the tube is thus sucked against the perforated belts and conducted in all safety towards the roller 22.
  • the train of lower belts 11 has been extended and brought as close as possible to the drum 21, by means of the roller 25. Furthermore care has been taken to insert a blower 26, which carries the tube on a cushion of air, into the corner formed by the roller 25, the train of belts 23 and the drum 21.
  • blowing chest 31 projects air onto the rear part of the section to prevent it from gaping if it is of the bellowsfold type, since the flap 29 draws by suction only upon its lower part.
  • the blowing chest 31 can be replaced by a mechanical device which accompanies the flap 29 and thus the section in the course of their descending movement.
  • the lowering of the flap 29 is continued until the rear part of the section rests on the fixed welding element 32. At this moment the welding gripper-33 descends so that the rear part of the section is wedged between the parts 32 and 33.
  • the element 32 constitutes the actual welding bar, while the gripper 33 has in its forward part a counter-presser bar 34 which can for example be of silicone rubber. This bar can also be replaced by a heating element to increase the production rate in the case of thick plastic material.
  • the forward part of the section arrives in the vicinity of the transfer drum 35 which carries grippers 36 disposed to be able to enter the grooves 37 of the welding drum 21.
  • the grippers 36 are already engaged in the grooves 37. They then close to grasp the end of the section which has become a bag and bring it towards the collecting drum 38.
  • the forward part of the bag has left the welding drum 21 while the rear part is still on it.
  • the welding gripper 33 and the flap 29 rise again and at the same time the air suction in the suction device 30 is halted. As soon as the welding gripper 33 is lifted.
  • the rear part of thebag is completely freed, and the still soft weld can contract, which imparts great firmness to it, and as moreover the transfer drum 35 pulls upon the forward part of the bag the weld is not subjected to any force unfavourable to its strength.
  • the transfer drum 35 brings the forward part of the bag to the collecting drum 38.
  • the grippers 36 enter the grooves 39 of the drum 38, open and transfer the bag to the grippers 40 and 41 of the drum 38, which are coaxial but each possesses its own cam and lever device, permitting of controlling their opening and closure separately.
  • the first bag When the first bag is grasped by the grippers 40 and 41, it carries out a complete revolution in the course of which it passes along a blowing mechanism 42 and 43, both parts of which are equipped with a series of nozzles 44 the emitted air of which cools the weld.
  • a series of guides 45 prevents the bag from coming into contact with the nozzles, and the air blown into the interior of the machine is evacuated by the suction nozzles 46.
  • apertures 53 are provided in the drum 38 to permit a fixed blower 54 to detach the bag closest to the drum at the moment when the grippers 47 grasp the bags to carry them on to the endless belt 51, to which a mechanism imparts a lateral advancing movement so that the different packets overlap like the slates of a roof.
  • the belts 27 are mounted in a frame 55 which pivots about a spindle 56 by means of a jack 57.
  • the belts 23 and 12 are mounted in a frame 58 which opens at front or rear by means of a jack (not shown).
  • the hood of the blower 42 can pivot about a spindle 59 by means of a pneumatic jack 60 in order to clear the collecting drum, and the hood of the upper blower 43 slides horizontally to the position 43' marked in dotted lines, clearing the upper part of the drum.
  • the invention is in no wise limited to that of its manners of application nor to those of the forms of embodiment of its various parts which have been more especially indicated. On the contrary it includes all variants thereof, such as that where the machine does not manufacture bags but analogous articles.
  • pneumatic guide systems replace mechanical guide systems or vice versa, and where mechanical devices are replaced by others, notably where the grippers, with which the drums 35and 38 and the chains 48 are equipped for the collection and ejection transferences, are replaced by pricker devices which in fact are needles aligned on bars which can enter the drum and issue therefrom. The transfer operation is then much simpler and the equipping of the machine is less onerous.
  • the points enter its forward part and hook to it.
  • the transfer drum 35 gives the bag to the collecting drum 38
  • the points of the drum 35 are retracted while those of the drum 38 are extended, the collecting of the plurality of bags one upon the other being effected in a simpler manner than with the grippers.
  • the drum 38 leaves the bags to pass them to the discharge chain
  • the points of the drum 38 retract while those fixed in place of the grippers 47 of the chain 48 are extended.
  • the points of the chain 48 retract, dropping the packet of bags.
  • FIGS. 4 and 5 a reel 1 of tubular or sheet plastic material rests with its spindle 2 on a support of known form.
  • the plastic material passes over a deflecting roller 3, then into an auxiliary drive device composed of the rollers 61 and 62, the roller 61 being driven by a variablespeed motor.
  • the band then passes over the rollers 63 and 64.
  • the rollers 63 are mounted on a rocking arm 65 which can oscillate about its axis.
  • a first transfer drum 66 is provided the outer shell of which is pierced with a series of holes 67 which are connected to a suction pump through a chamber 68, a pipe 69 and a hollow shaft 70, a rotary distributor placed between the latter and the compressor permitting of supplying the chamber 68 at will.
  • the transfer drum 66 is in the position as indicated in FIG. 4, the suction takes place upon the forward part of the bag and entrains the latter towards the sealing drum 21.
  • the rotary distributor cuts off the compressor from the chamber 68,
  • the second transfer drum 35 which comprises the grippers 36 in the first form of embodiment of the machine, is advantageously. replaced by another of the same dimensions, but inwhich thetransference is effected no longer by grippers but by suction as in the drum 66.
  • a rotary element 71 which carries at its end a bar 72 capable of retaining a small quantityof water or refrigerant liquid contained in a basin 74 and distributed by a roller device,75.
  • the angular positionv of the arm 71 is regulated so that it comes into contact with the weld which has just been effected. So that slight variations of the position of the bag .due to theelasticity of the-materialv may be compensated, the bar 72 is wider than the weld, and moreover the arm 71 is controlled by means of a positioning differential which permits of precise adjustment of its position during operation.
  • the bag is brought to the drum 38 on which the packets are collected which are then taken up again by the ejector drum 76, the role of which is considerably to retard the packet of bags coming from the drum 38.
  • Chains 48 turning at low speed can then easilytake the packet and deposit it on the belt 51 which moves, according to a preferred embodiment of the invention, transversely of the machine.
  • tube lengths 77 are brought continuously by the first transfer drum 66 onto the drum 21 and beneath the belts 11 (not shown).
  • Three bags are engaged on the drum 21 and their rear parts rest on the flaps 29.
  • the second transfer drum 35 has the task of discharging the welded bags by grasping them by their mouths.
  • the welding drum comprises twopart blocks 78 and 79 each of which has a cavity, into which the electric heating resistance 80 is inserted, and it is the piece 82 which effects the weld and is covered with a protective coating of Teflon.
  • This piece is held between the pieces 78 and 79 by gripping by the screws 81.
  • This arrangement ensures an excellent heat transmission between the parts 78, 79 on theone hand and the part 82 on the other.
  • To change'the piece 82 it is merely necessary slightly to slacken the screws 81, then withdraw and replace the piece.
  • the grippers 83 open to free the fronts of the bags
  • the grippers 47 of the chain 48 commence to reclose and the retarding device comes into action again.
  • It comprises two discs 76 which rotate in the same direction as the arms 84, but which are driven with a very slow rotating movement which is obtained through the intermediary of a pinion 88 mounted on its spindle 89 and meshing with a toothed wheel 90 fast with the discs 76.
  • This assembly can rotate freely on the shaft 91 through the intermediary of the ball bearings 92, and the shaft 91 rotates more rapidly as it carries the arms 84 which are keyed on it.
  • Around this rotating assembly there is a series of hoops 93 of any desired section.
  • These parts are fixed and gripped in the parts 94, which are themselves fast with the main frame of the machine through the in-- termediary of the shafts 95.
  • the retarding device likewise comprises a roller 96 mounted on a shaft 97.
  • the linear speed of the roller 96 corresponds to the linear speed of the discs 76.
  • the shaft 97 is mounted in a pair of levers 98 which can oscillate about the centre 99, and each of them carries at its end a roller 100 which rests on a cam 101.
  • the application of the roller 100 is effected by means of the spring 102 which bears on afix'ed part 103.
  • the cam 101 is in a position such that the roller 96 is applied to the discs 76.
  • the gripping is effected on the rear part of the bags, the effects of the kinetic energy contained in the packet of bags are eliminated.
  • the device for collection on the drum 38 and the 'retarding device as described above are usable as such not only on the two forms of embodiment as described but also upon known slower machines where the ejection system is not provided to form packets of bags.
  • the machine according to the invention is equipped with a safety device so that in the case of a stoppage the bags engagedbetween the drum 21 and the belts 11 may not be melted.
  • the rear parts of the bags are fixed by suction on flaps 29 which in normal running are connected to a pump through the intermediary of a distributor and that the bag rear parts are turned downwards towards the welding grippers.
  • the pipes 30 are connected by means of another distributor to the blowing part of the pump, which has the effect of projecting the rear parts of the bags towards the belts 11 and prevents them from being engaged between the welding gripp
  • FIG. 10 shows how a packet of interconnected bags appears.
  • the perforation 105 At their rear part there is the weld 104, at their front part the perforation 105.
  • the different bags have been interconnected byfusion over the whole perimeter of the holes 106.
  • the packet is hooked by the holes 106 on to a board having two nails. A pull upon each bag detaches it along the perforation 105.
  • the machine is equipped with two small supplementary devices, one serving to make the line of perforation 105, the other serving to make the holes 106 and to effect the fusion of the bags to one another along the circumference of these holes.
  • the cuttingof the material 107 iseffected by means of the lower cutter 6 and the upper rotating cutter 8.
  • To obtain the perforation line 105 it was necessary to complete the cutting device with a second cutter 108, FIG. 12, the distance of the edge of which from that of the cutter 8 corresponds to that of the lines 107 and 105.
  • the cutter 108 has a large number of notches 109. After this operation the bags are taken by-the machine to ejection in known manner; I
  • the block 110 which carries the grippers 47 comprises two cylindrical pieces which can slide in guides 112 under the action of a ramp 113 and a return spring 114.
  • the parts 111 are partly hollow and comprise anelectric resistance in this region, which permits their heating. Their electric current supply is effected by means of sliding contacts of known type.
  • the packet of bags grasped and drawn by the grippers 47 and the block 110 advances slowly from right to left.
  • the head of the partlll slides along the ramp 113 and drives gently into the forward part of the bags under the pressure of the'said ramp, piercing them by-fusion.
  • the part 111 withdraws leaving a hole, a fused circumference of which has permitted of welding the bags to one another.”
  • the machine according to the invention is equipped with an automatic vdevice .which permits of effecting temperature and speed regulations without any manual intervention, which is especially useful in the acceleration phase at each starting-up. For every material thickness one knows the necessary temperature of the welding grippers for a given production rate, just as one knows the maximum production rate which it is reasonable to expect I
  • the instrument panel of the machine comprises a dial on which the anticipated production rate can be shown, a dial on which the welding temperature at slow speed of the machine can be indicated and a dial on which the welding temperature necessary for the anticipated production rate can lie-indicated.
  • the welding temperatures are substantially proportional to the speed of the machine.- On many machines with low production speeds the fusion temperature is corrected automatically as a function of the speed. This method has proved inadequate for a fast machine, since if the acceleration is great it is possible for the machine rapidly to achieve an operating rate such that, despite the temperature correction devices, the grippers have not had time to heat up sufficiently.
  • the automatic control device according to the invention is in fact a brain which permanently monitors the concordance between the temperature and. the speed, so that the machine cannot accelerate if the temperature is not yet reached; although one may not know the temperature necessary for an intermediate speed, it is sufficient to know the slow speed temperature and the maximum speed temperature.
  • This device will dispense with consideration of the three buttons described above, when they have been adjusted, and with pressing an automatic'acceleration button, as the machine itself permanently seeks the permitted speed for the temperature which the grippers have just reached- If for any reason the operator does not wish to accelerate to the speed pre-determined on the dial, another button permits of interrupting, at any moment, the acceleration of the machine which will continue to operate at the speed which it has just reached.
  • the welding device comprises a movable flap 29, a welding element 32, a welding gripper 33 with a counter-presser bar, 34 which comprises a bar of silicone rubber in order to avoid adhesion with the material to be welded.
  • a further characteristic of the invention consists in fixing a piece of glass fibre fabric on the movable flap 29, so that there is an overhang upon which the rear part of the bag 116 is placed, upon which the weld is to be effected in 1 the course of the rotation of the drum 21.
  • FIG. 15 shows the welding position: the flap 29 has descendedin the course of the rotation, and with it the fabric 115, and by virtue of the holes in the latterwhich coincide with those of the flap 29'which are connected to the suction system 30 (not shown), the rear part of the bag 116 also descends, but can no longer come into contact with the element 32 directly, since it is insulated by-virtue of the glass fibre fabric 115.
  • the welding gripper 33 with its bar 34 is likewise shown in the closed position.
  • the bar 34 can for example be constituted by silicone rubber or ordinary heat-resistant rubber wrapped in glass fibre fabric, in accordance with currently known methods.
  • the glass fibre fabric 115 which in currently existing machines permanently surrounds the. heated element .32, is thus subjected to the same movements as the flap 29, so that at regular intervals it is raised, then lowered towards the element 32 and vice versa. This movement leads to a regular ventilation of the part 115, the lifeof which is thus considerably increased, since in the course of these movements the stored heat is largely dissipated.
  • fibre-glass-lined flap device can be utilised with advantage in other types of machines, especially in bag welding machines with alternating motion in which the welding element and the movable gripper are not rotary.
  • the fastening of the piece 115 on the flap 29 can be realised in different manners: it is possible to use selfadhesive glass fibre fabric, it is possible to use ordinary glass fibre fabric and to fasten it with self-adhesive strips, or the glass fibre fabric can be fastened by mechanical means, in the present case by bars and screws, either on the upper part, or on the lateral face, or on the rear face 117 of the flap 29.
  • the glass fibre fabric which is used for preference could of course be replaced by insulating foils having identical or analogous properties, without thereby departing from the scope of the invention.
  • a machine for the manufacture of bags of thermoplastic material comprising means to advance a continuous tube of thermoplastic material, means for severing from said tube relatively short lengths of said materiaL'a welding drum having means thereon for heat sealing closed one end of said relatively short lengths of material, a collecting drum for collecting thereon stacks of said relatively short lengths of material with one end sealed closed, and means for transferring said severed lengths with one end sealed closed from said welding drum to said collecting drum; the improvement in which said collecting drum has pairs of grippers theron for gripping the forward ends of the bags of said stacks, and means to operate said grippers alternately whereby one gripper of the pair grips the severed lengths already in the stack while the other gripper retracts to permit a newsevered length to be added to the top of the stack, after which said other gripper grips the stack and said one gripper retracts to permit a still further severed length to be added to the top of the stack.
  • a machine as claimed in claim 1 and means mounting said grippers of each said pair for swinging movement about a common axis parallel to the axis of said collecting drum.
  • thermoplastic material comprising means for advancing a continuous tube of thermoplastic materiaLmeans for severing relatively short lengths from said tube, a welding drum on which one end of each said relatively short length is heat sealed closed, and a collecting drum on which said relatively short lengths with one end sealed closed are collected in groups; the improvement comprising a transfer drum disposed between said welding drum and said collecting drum and having means thereon for receiving said relatively short lengths with one end sealed closed from said welding drum and transferring them to said collecting drum, said welding drum having means thereon for welding closed the rear ends of said severed lengths, said welding means comprising heat sealing means disposed within the periphery of said welding drum, and means to deflect the rear ends of said severed lengths radially inwardly of said welding drum for engagement with said heat sealing means.
  • a machine as claimed in claim 3 and endless belts encompassing a major portion of the periphery of said welding drum and spaced apart in a direction parallel to the axis of the welding drum, said heat sealing means being disposed entirely within the contour of said belts.
  • said deflecting means comprising a flap mounted for swinging movement about an axis parallel to the axis of the welding drum for movement between an outer position in which the outer surface of the flap lies on the periphery of the drum, and a radially inner position in which the flap directs said rear ends of said severed lengths toward said heat sealing means.
  • said flap having a glass fiber surface that contacts said material, said glass fiber overhanging said flap to occupy a position in said inner position of said flap between said material and a lower portion of said heat sealing means thereby to prevent adhesion between said lower portion of said heat sealing means and said material.
  • said urging means comprising means directing air radially inwardly against said rear ends of said flap.
  • thermoplastic material comprising means for advancing a continuous tube of thermoplastic material, means for severing relatively short lengths from said tube, a welding drum on which one end of each said relatively short length is heat sealed closed, and a collecting drum on which said relatively short lengths with one end sealed closed are collected in groups; the improvement comprising a transfer drum disposed between said welding drum and said collecting drum and having means thereon for receiving said relatively short lengths with one end sealed closed from said welding drum and transferring them to said collecting drum, said groups comprising stacks, said collecting drum having thereon pairs of grippers for gripping the forward ends of the bags of said stacks, and means to operate said grippers alternately whereby one gripper of the pair grips the severed lengths already in the stack while the other gripper retracts to permit a new severed length to be added to the top of the stack, after which said other gripper grips the stack and said one gripper retracts to permit a still further severed length to be added to the top of the stack.
  • a machine as claimed in claim 9 and means mounting said grippers of each said pair for swinging movement about a common axis parallel to the axis of said collecting drum.

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US00201065A 1970-11-30 1971-11-22 Bag-manufacturing machine Expired - Lifetime US3833446A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR7043599A FR2115747A5 (enrdf_load_stackoverflow) 1970-11-30 1970-11-30
FR7126954A FR2146675A6 (enrdf_load_stackoverflow) 1971-07-16 1971-07-16
FR7139448A FR2158750A6 (en) 1971-10-28 1971-10-28 Plastic bags - from perforated tubular material and welding drum

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US3833446A true US3833446A (en) 1974-09-03

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US00201065A Expired - Lifetime US3833446A (en) 1970-11-30 1971-11-22 Bag-manufacturing machine

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US (1) US3833446A (enrdf_load_stackoverflow)
ES (1) ES397449A1 (enrdf_load_stackoverflow)
GB (1) GB1350224A (enrdf_load_stackoverflow)
IT (1) IT941614B (enrdf_load_stackoverflow)
NL (1) NL7116371A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970499A (en) * 1973-05-15 1976-07-20 Jagenberg Werke Ag Method for the application of glued labels to bottles or the like
US3971299A (en) * 1974-10-03 1976-07-27 United Kingdom Atomic Energy Authority Manufacture of bags
US4114520A (en) * 1976-04-14 1978-09-19 Windmoller & Holscher Apparatus for making bags from a continuously fed thermoplastic tubular web of film
US5876317A (en) * 1994-07-19 1999-03-02 Philip Morris Incorporated Method and apparatus for preparing blanks
WO2006082012A1 (de) * 2005-02-03 2006-08-10 Schroeder Frerkes Julius Verfahren und vorrichtung zum fenstereinschweissen in faltschachtelzuschnitten
US20120196732A1 (en) * 2011-01-27 2012-08-02 Castro Noe Yanez Clampless bar mechanism and method for making a paper bag
CN109159483A (zh) * 2018-08-30 2019-01-08 浙江正威机械有限公司 塑料立体袋片料的底部打开装置
CN114986991A (zh) * 2022-07-01 2022-09-02 海宁市方圣包装材料有限公司 一种包装袋的生产设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117741B (en) * 1982-04-05 1985-09-04 Alpine Plastic Machinery Ltd Bag forming machine
US4516895A (en) * 1982-04-05 1985-05-14 Alpine Plastics Machinery Limited Bag forming machines of the top stacking type with stack clamp
CN113246538B (zh) * 2021-06-17 2025-02-14 浙江新新包装机械有限公司 模块化设计的多功能制袋机

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US2333440A (en) * 1940-01-17 1943-11-02 Potdevin Machine Co Bagmaking machine
US2680471A (en) * 1950-12-14 1954-06-08 Milprint Inc Heat and pressure sealing apparatus
US2952299A (en) * 1954-10-20 1960-09-13 Windmoeller & Hoelscher Method and apparatus for making bags of thermoplastic tubing
US3075678A (en) * 1959-01-15 1963-01-29 William F Huck Variable cutting and delivery apparatus
US3506523A (en) * 1967-02-27 1970-04-14 Continental Can Co Machine for forming bags from thermoplastic tubing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333440A (en) * 1940-01-17 1943-11-02 Potdevin Machine Co Bagmaking machine
US2680471A (en) * 1950-12-14 1954-06-08 Milprint Inc Heat and pressure sealing apparatus
US2952299A (en) * 1954-10-20 1960-09-13 Windmoeller & Hoelscher Method and apparatus for making bags of thermoplastic tubing
US3075678A (en) * 1959-01-15 1963-01-29 William F Huck Variable cutting and delivery apparatus
US3506523A (en) * 1967-02-27 1970-04-14 Continental Can Co Machine for forming bags from thermoplastic tubing

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970499A (en) * 1973-05-15 1976-07-20 Jagenberg Werke Ag Method for the application of glued labels to bottles or the like
US3971299A (en) * 1974-10-03 1976-07-27 United Kingdom Atomic Energy Authority Manufacture of bags
US4114520A (en) * 1976-04-14 1978-09-19 Windmoller & Holscher Apparatus for making bags from a continuously fed thermoplastic tubular web of film
US5876317A (en) * 1994-07-19 1999-03-02 Philip Morris Incorporated Method and apparatus for preparing blanks
US7722730B2 (en) 2005-02-03 2010-05-25 Schroeder-Frerkes Julius Method and device for heat-sealing windows into folding carton blanks
US20080149278A1 (en) * 2005-02-03 2008-06-26 Julius Schroder-Frerkes Method and Device for Heat-Sealing Windows Into Folding Carton Blanks
WO2006082012A1 (de) * 2005-02-03 2006-08-10 Schroeder Frerkes Julius Verfahren und vorrichtung zum fenstereinschweissen in faltschachtelzuschnitten
CN101090814B (zh) * 2005-02-03 2010-09-29 尤利乌斯·施罗德-弗雷克斯 用于折叠盒坯料中的窗口热焊接的方法和装置
US20120196732A1 (en) * 2011-01-27 2012-08-02 Castro Noe Yanez Clampless bar mechanism and method for making a paper bag
US8764618B2 (en) * 2011-01-27 2014-07-01 Duro Bag Manufacturing Company Clampless bar mechanism for a paper bag bottoming mechanism
CN109159483A (zh) * 2018-08-30 2019-01-08 浙江正威机械有限公司 塑料立体袋片料的底部打开装置
CN109159483B (zh) * 2018-08-30 2024-04-12 浙江正威机械有限公司 塑料立体袋片料的底部打开装置
CN114986991A (zh) * 2022-07-01 2022-09-02 海宁市方圣包装材料有限公司 一种包装袋的生产设备

Also Published As

Publication number Publication date
DE2159178A1 (de) 1972-05-31
NL7116371A (enrdf_load_stackoverflow) 1972-06-01
IT941614B (it) 1973-03-10
ES397449A1 (es) 1975-03-16
DE2159178B2 (de) 1975-05-22
GB1350224A (en) 1974-04-18

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