US3640187A - Bagmaking machines for making plastics side-fold bags with carrier handles - Google Patents

Bagmaking machines for making plastics side-fold bags with carrier handles Download PDF

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Publication number
US3640187A
US3640187A US51915A US3640187DA US3640187A US 3640187 A US3640187 A US 3640187A US 51915 A US51915 A US 51915A US 3640187D A US3640187D A US 3640187DA US 3640187 A US3640187 A US 3640187A
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US
United States
Prior art keywords
bags
tubular web
carrier
fixing apparatus
handle fixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US51915A
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English (en)
Inventor
Friedhelm Mundus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19691937480 external-priority patent/DE1937480C3/de
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Application granted granted Critical
Publication of US3640187A publication Critical patent/US3640187A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/864—Mounting separate handles on bags, sheets or 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

Definitions

  • a carrier handle fixing apparatus is'controlled such that carrier handles are fed to the leading ends of the cut Forgign Application Priority Data lengths of tubular web in the opposite direction to the July 23, 1969 Germany direction of movement thereof and in the plane of movement thereof.
  • the carrier handles are fixed while the cut lengths of tubular web are at a standstill.
  • the finished bags are conveyed by a conveyor.
  • the plane of the conveyor is displaced relative to the plane of conveyance of the cut lengths of tubular web such that discharge of the finished bags is not hindered by the carrier handle-fixing apparatus.
  • Plastics carrier bags with carrier handles which are stiff so as to retain their form and which are welded into the mouth of the bag, have been known for many years (see for example German Gebrauchsmuster No. 1,862,149, US. Pat. No. 3,140,038, and French Pat. No. 1,410,939).
  • a single-ply web of plastics material was previously folded about its longitudinal center line or a seamlessly extruded tube of plastics material was made into a semitubular form by severing along a fold edge.
  • Modern bagmaking machines for making plastics side-fold bags from a stepwise advanced tubular web provided with side folds produce the side-fold bags by making transverse severing cuts at a distance corresponding to the desired bag length from the leading end of the tubular web, and by making transverse welds for the bottom seams.
  • the finished bags leave the bagmaking machine in a longitudinal position at equal distances apart.
  • On the discharge conveyor means they form a continuous row in which the mouths of the bags extend transversely to the direction of movement and open into the narrow space between adjacent bags, where they are inaccessible for the fitting of carrier handles.
  • the present invention is based on the problem of providing a bagmaking machine which makes it possible for the carrier handles to be fitted fully mechanically to the mouth of the bag, without the bags changing their longitudinal position, and avoiding the above-mentioned expensive steps which were previously considered necessary to produce side-fold carrierhandle bags in a fully mechanical process.
  • a bagmaking machine for making plastics side-fold bags from a stepwise advanced tubular web provided with side folds, including a transverse welding and cutting apparatus for cutting the tubular web into lengths and forming the bottom seams of the bags, a carrier handle fixing apparatus which is controlled such that carrier handles are fed to the leading ends of the cut lengths of tubular web in the opposite direction to the direction of movement thereof and in the plane of movement thereof and there are fixed while the cut lengths of tubular web are at a standstill, and a conveyor which continues the conveyance of the finished bags, the plane of the conveyor being displaced relative to the plane of conveyance of the cut lengths of tubular web such that discharge of the finished bags is not hindered by the carrier handle fixing apparatus.
  • theleading opening of the tubular web is available for fitting the carrier handles which can preferably be welded in place on the inside, possibly with special steps being taken to prevent the edges of the bag being welded together, although the carrier handles can also be welded on from the outside.
  • the conveyor means which conveys the finished carrier handle bags is advantageously arranged below the plane of conveyance of the bagmaking machine.
  • Thisarrangement of the further conveyor means which comprises a conveyor belt, a sliding plate or the like, has theadvantage that the carrier handles are removed from a magazine at the lower end and that the carrier handles secured to the bag guide the bag downwardly due to their weight on to the conveyor means as soon as they are released by the carrier handle fixing apparatus.
  • This arrangement therefore easy refilling of the carrier handle magazine while the apparatus is in operation and makes it unnecessary to provide special means to transfer the finished bags to the conveyor means.
  • the carrier handle fixing apparatus is displaceable in the direction of movement of the tubular web relative to the other parts of the bagmaking machine, while a double-belt conveyor which is variable in length is arranged upstream of the carrier handle fixing apparatus.
  • This design of bagmaking machine makes it possible for the leading end of the tubular web always to be brought into the standstill position at the correct distance from the carrier handle fixing apparatus, irrespective of the length of the bags to be produced, and thus makes it possible forthe foremost cut length of tubular web to be supported by means of the variable-length double-belt conveyor during manufacture of the bag, in the variable space between the transverse cutter and the-transverse welding apparatus on the one hand and the carrier handle fixing apparatus on the other hand.
  • the double-belt conveyor for the purposes of varying its length, it is provided with di ection-changing rollers which are displaceable in the forward direction at its discharge end and, in the region of its idle runs, with loop-forming means which are displaceable transversely to the direction of conveyance and in opposite directions to each other, being in the form of guide pulleys for the two idle runs of the double-belt conveyor, while the direction-changing rollers are mounted on the frame of the displaceable carrier handle fixing apparatus and the loop-forming means are mounted on the stationary frame of the bagmaking machine.
  • the double conveyor belt may then be lengthened or shortened by displacement of the carrier handle fixing apparatus, while the loop-forming means are to be displaced accordingly.
  • the loop-forming means can also be held in their working position by a spring force so that they can readily resiliently follow the variations caused in the loops in the idle runs by the variation in length of the doublebelt conveyor.
  • the belt tension of the doublebelt conveyor varies in dependence on the variation in length thereof, such that it is substantially increased with increasing length and vice versa, considerably reduced, particularly when the variations in length are large.
  • the two loop-forming means are positively displaceable in opposite directions to each other by means of a common threaded spindle with a portion having a right-hand thread and a portion having a lefthand thread
  • the carrier handle fixing apparatus is also displaceable by means of a threaded spindle, wherein the two threaded spindles are connected together by means of a common adjusting gear and the pitches of the two threaded spindles are such that when the carrier handle fixing apparatus and the loop-forming means are simultaneously displaced by means of the common adjusting gear, the belt tension of the double-belt conveyor remains unaltered.
  • This embodiment of the subject of the invention makes it possible for the bagmaking machine to be rapidly converted to other lengths of bag, using only one adjusting member. It also makes it possible for per se known means for varying the conveyor belt tensions to be provided on the conveyor belts of the double-belt conveyor, which means can be used to set the optimum belt tension in respect of working life and preventing belt slip.
  • FIG. 1 shows an elevation of the machine
  • FIG. 2 shows a plan view corresponding to FIG. 1,
  • FIG. 3 shows a side-fold bag with carrier handles, produced by the machine shown in FIGS. 1 and 2.
  • the side-fold bags are produced from a tubular web S which already has the side folds F1 and F2.
  • a pair of feed rollers 3 which rotate intermittently in the working cycle of the machine
  • a transverse welding and cutting apparatus 4 which extends over the width of the tubular web S and which is reciprocal relative to the tubular web S in the working cycle of the machine by means of the eccentric drive 5
  • a continuously conveying double-belt conveyor 6 for discharging the side-fold bags
  • a stop 8 which is movable upwardly and downwardly in the working cycle of the machine by means of the drive rod 7 and which holds the tubular web S still during the operations of transverse welding and cutting.
  • the arrangement of the cutting tool and the welding beam in the transverse welding and transverse cutting apparatus 4 is such that the tubular web S is cut transversely downstream of the transverse weld scam in the direction a of web movement.
  • the cut lengths of tubular web produced are thus removed from the bagmaking machine by the double-belt conveyor 6 in the longitudinal direction, with the open ends, that is the mouths of the bags leading.
  • the carrier handle fixing apparatus 2 Arranged downstream of the part 1 of the machine is a per se known carrier handle fixing apparatus 2 which is provided to secure a respective pair of carrier handles T made of thermoplastics material by welding in the mouth of each bag.
  • the carrier handle fixing apparatus 2 comprises the oppositely movable pair of suckers 9 and 9' for opening the mouth of the bag, a magazine 10 for a stack 11 of carrier handles T, with a slider 12 for removing the lowermost pair of can-ier handles T from the magazine 10 and for sliding that pair forward into the mouth of the bag, and a pair of welding tongs l3 and 13 for welding one carrier handle of the pair to the inside of a respective one of the two sidewalls of the bag, at the edge of the mouth thereof.
  • the pair of suckers 9 and 9' is actuated in the working cycle of the machine by a thrust cam 14 by means of the linkage l5, 16, 17, 18, while the electrically heated jaws of the welding tongs l3 and 13 are opened and closed by means of the thrust cam 19 and the linkage 20, 21.
  • the magazine slide 12 is driven by the thrust cam 22 by means of the linkage 23, 24, 25.
  • the arrangement of the carrier handle fixing apparatus 2 relative to the part 1 of the machine is, as is clearly apparent from FIG. 1, such that the working plane of the carrier handle fixing apparatus 2 lies precisely in the working plane E-E of the other parts of the machine.
  • a discharge conveyor belt 26 which, as is readily apparent from FIG. 1, extends into the region of the carrier handles T removed from the magazine 10 and held by the slide 12 in readiness for welding, and which discharges the finished bags without their being hindered by the carrier handle fixing apparatus 2 as when they are discharged by means of the doublebelt conveyor 6, they simply slide downwardly on to the conveyor belt 26.
  • the feed rollers 3 each time draw the tubular web S by the length of one bag from a feed roll (not shown) and move it into the region of the transverse welding and cutting apparatus 4, the stop 8 and the double-belt conveyor 6 which rotates continuously at the peripheral speed of the pair of feed rollers 3.
  • the double-belt conveyor 6 moves the tubular web S with its forward open end into the region of the suckers 9 and 9 which are applied upwardly and downwardly to the tubular web S, pull up the forward end of the tubular web S in synchronism with the double-belt conveyor 6 and hold said end open during the subsequent standstill period of the feed rollers 3.
  • the stop 8 is applied to the tubular web S and holds it still against the pull of the continuously moving double-belt conveyor 6, whereupon the transverse welding and cutting apparatus 4 is advanced towards the tubular web S in order to form the transverse weld seam N (FIG. 3) which forms the bottom of the side-fold bag B, and to separate the bag from the tubular web S.
  • the magazine slide 12 removes the lowermost pair of carrier handles T from the magazine 10, moving in the opposite direction to the direction a of movement of the tubular web S, towards the end of the tubular web S which is held open by the suckers 9 and 9, and pushes the carrier handles T with their weld-attachment bars into the opening at the end of the tubular web S, as shown in FIG. 1.
  • the welding tongs 13 and 13' then close and weld the two sidewalls of the tubular web S at the edge of the opening thereof, to the two weld-attachment bars of the carrier handles T, so that one carrier handle of the pair is joined to each wall of the tubular web S.
  • the slide 12 then returns to its righthand starting position, releasing the pair of carrier handles T.
  • the pair of carrier handles T then tips downwardly under the force of gravity on to the conveyor belt 26, while the stop 8 opens and the pair of feed rollers 3 carries out its next feed step.
  • the side-fold bag B provided with carrier handles T and severed from the tubular web S is now deflected by the conveyor belt 26 out of the working plane E-E so as to bypass the apparatus 2, and is discharged by the conveyor belt 26.
  • the carrier handle fixing apparatus 2 must be arranged at such a distance from the remainder of the machine that the distance between the transverse welding and cutting apparatus 4 and the welding tongs l3 and 13' is equal to the length l of the bag to be produced.
  • the carrier handle fixing apparatus 2 is mounted on stationary guide bars 27 and 27' so as to be displaceable relative to the part 1 of the machine in the direction a of web movement, and is adjustable by means of the threaded spindle 38.
  • the double-belt conveyor 6 is also made variable in length.
  • it is provided at its discharge end with direction-changing rollers 28 and 28' which are mounted on the frame of the carrier handle fixing apparatus 2 and which are displaceable therewith, and in the region of its idle runs, with variable loop-forming means 29 and 29'.
  • the loop-forming means 29 and 29' comprise direction-changing rollers 31 and 31 mounted in holders 30 and 30'.
  • the holders 30 and 30' are seated on. threaded spindles 32 and 32' which are mounted on the frame of the machine, each of the threaded spindles 32 and 32' having a right-hand and a left-hand threaded portion 33 and 34.
  • the threaded spindles 32 and 32' extend transversely to the direction a of web movement.
  • the idle runs of the conveyor belts of the double-belt conveyor 6 form loops 35 and 35', by passing over stationary guide rollers 36 and 36, and 37 and 37' respectively, and the directionchanging rollers 31 and 31'.
  • the threaded spindles 32, 32' and 38 are connected together by way of a common adjusting gear 39 and are simultaneously rotatable by means of the hand wheel 40.
  • the pitches of their threads are such that when the carrier handle fixing apparatus 2 and the loop-forming means 29 and 29' are simultaneously displaced by means of the gear 39, the belt tension of the double-belt conveyor 6 remains unaltered.
  • a bagmaking machine for making plastics side-fold bags from a stepwise advanced tubular web provided with side folds including a transverse welding and cutting apparatus for cutting the tubular web into lengths and forming the bottom seams of the bags, a carrier handle fixing apparatus which is controlled such that carrier handles are fed to the leading ends of the cut lengths of tubular web in the opposite direction to the direction of movement thereof and in the plane of movement thereof and there are fixed while the cut lengths of tubular web are at a standstill, and a conveyor which continues the conveyance of the finished bags, the plane of the conveyor being displaced relative to the plane of conveyance of the cut lengths of tubular web such that discharge of the finished bags is not hindered by the carrier handle fixing apparatus.
  • the double-belt conveyor is provided with direction-changing rollers which are displaceable in the direction of conveyance at its discharge end and, in the region of its idle runs, with displaceable loop-forming means, the direction-changing rollers being mounted on the frame of the displaceable carrier handle fixing apparatus and the loopfomiing means being mounted on the stationary frame of the machine.
  • loop-forming means are displaceable in opposite directions to each other by means of common threaded spindles with a portion having a right-hand thread and a portion having a left-hand thread
  • the carrier handle fixing apparatus is also displaceable by means of a threaded spindle, the threaded spindles being connected together by a common adjusting drive and the pitches of the threaded spindles being such that when p the carrier handle fixing apparatus is displaced, the belt ten-

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US51915A 1969-07-23 1970-07-02 Bagmaking machines for making plastics side-fold bags with carrier handles Expired - Lifetime US3640187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691937480 DE1937480C3 (de) 1969-07-23 Beutelmaschine zum Herstellen von Kunststoff-Seitenfaltenbeuteln mit Trag-Qriffen

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Publication Number Publication Date
US3640187A true US3640187A (en) 1972-02-08

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Application Number Title Priority Date Filing Date
US51915A Expired - Lifetime US3640187A (en) 1969-07-23 1970-07-02 Bagmaking machines for making plastics side-fold bags with carrier handles

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US (1) US3640187A (xx)
JP (1) JPS4822777B1 (xx)
BE (1) BE753374A (xx)
FR (1) FR2055178A5 (xx)
GB (1) GB1296598A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857329A (en) * 1970-01-05 1974-12-31 M Lehmacher Fabrication of a carrying bag from thermoplastic synthetic film
US3910167A (en) * 1972-10-04 1975-10-07 Roger Simon Machine for placing and welding handles on plastic bags
US4317697A (en) * 1980-09-29 1982-03-02 Reynolds Metals Company Sealing mechanism

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51115679A (en) * 1975-04-03 1976-10-12 Furukawa Electric Co Ltd:The Electric cable for low temperature
EP0083498A3 (en) * 1982-01-04 1985-03-06 Radyne Limited Manufacturing plastic bags
CN106626523A (zh) * 2016-10-01 2017-05-10 天津捷源智机科技有限公司 一种应用于纸箱纸盒的提手穿装设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034409A (en) * 1958-05-14 1962-05-15 Finke Arno Method and apparatus for producing and applying bag handles
US3266053A (en) * 1962-07-24 1966-08-09 Windmoeller & Hoelscher Method of manufacturing carrier bags of weldable material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034409A (en) * 1958-05-14 1962-05-15 Finke Arno Method and apparatus for producing and applying bag handles
US3266053A (en) * 1962-07-24 1966-08-09 Windmoeller & Hoelscher Method of manufacturing carrier bags of weldable material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857329A (en) * 1970-01-05 1974-12-31 M Lehmacher Fabrication of a carrying bag from thermoplastic synthetic film
US3910167A (en) * 1972-10-04 1975-10-07 Roger Simon Machine for placing and welding handles on plastic bags
US4317697A (en) * 1980-09-29 1982-03-02 Reynolds Metals Company Sealing mechanism

Also Published As

Publication number Publication date
BE753374A (fr) 1970-12-16
JPS4822777B1 (xx) 1973-07-09
DE1937480A1 (de) 1971-02-18
FR2055178A5 (xx) 1971-05-07
DE1937480B2 (de) 1972-01-20
GB1296598A (xx) 1972-11-15

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