EP1281649A1 - Méthode et dispositif pour produire des rouleaux de sacs - Google Patents

Méthode et dispositif pour produire des rouleaux de sacs Download PDF

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Publication number
EP1281649A1
EP1281649A1 EP01850137A EP01850137A EP1281649A1 EP 1281649 A1 EP1281649 A1 EP 1281649A1 EP 01850137 A EP01850137 A EP 01850137A EP 01850137 A EP01850137 A EP 01850137A EP 1281649 A1 EP1281649 A1 EP 1281649A1
Authority
EP
European Patent Office
Prior art keywords
bags
belt
spindle
set forth
roll
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.)
Withdrawn
Application number
EP01850137A
Other languages
German (de)
English (en)
Inventor
Willy Bartels
Gert-Arne Magnusson
Thomas Holm
Thomas Leijon
Per Anders Hallin
Zoltan Darvas
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.)
FAS Converting Machinery AB
Original Assignee
FAS Converting Machinery AB
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
Application filed by FAS Converting Machinery AB filed Critical FAS Converting Machinery AB
Priority to EP01850137A priority Critical patent/EP1281649A1/fr
Publication of EP1281649A1 publication Critical patent/EP1281649A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/006—Winding articles into rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/58—Article switches or diverters
    • B65H29/60—Article switches or diverters diverting the stream into alternative paths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/419—Winding, unwinding from or to storage, i.e. the storage integrating winding or unwinding means
    • B65H2301/4191—Winding, unwinding from or to storage, i.e. the storage integrating winding or unwinding means for handling articles of limited length, e.g. AO format, arranged at intervals from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/191—Bags, sachets and pouches or the like

Definitions

  • the present invention relates to the art of winding equipment. More specifically, the invention relates to an apparatus and a method of producing rolls of plastic bags, in which the bags are wound into a roll without being connected to one another. The invention also concerns a winding station.
  • winding machines for winding pliable strips of material such as plastic bags.
  • One type of apparatus is arranged to wind bags into a roll without the bags being connected to one another.
  • a bag is separated from a continuous web of bag material having transverse lines of perforations in the boundary between adjacent bags.
  • a leading end of the separated bag is arranged to overlap a trailing end of a preceding bag, thereby building a strand of so-called interleaved bags.
  • This strand of bags is then wound into a roll in a winding device.
  • a roll-forming apparatus of this kind has a tumbler assembly, which is arranged between a feeding device and a winding device.
  • the tumbler device is adapted to receive a continuous web of bag material from the feeding device.
  • a bag is separated from the web and arranged to partly overlap a trailing end of the succeeding web fed from the feeding device.
  • the strand of interleaved bags thus formed is fed to the winding device, in which a roll of bags is formed.
  • US-A-4 000 864 discloses a roll-forming apparatus in which a gripping device is arranged between a feeding device and a winding device.
  • the gripping device is adapted to grip the leading edge of a separated bag as received from the feeding device, accelerate the separated bag relative to a preceding bag, decelerate the separated bag and place a leading end of the separated bag on a trailing end of the preceding bag. This operation is repeated to form a strand of interleaved bags, which are fed to the winding device.
  • US-A-4 034 928 discloses a roll-forming apparatus having a sheet tuck-in means in the form of a blade.
  • a bag is folded by advancing the blade into contact with the bag about midway between its terminal edges.
  • a succeeding bag is fed to the tuck-in means, folded and advanced such that it is caught between the terminal edges of the preceding bag.
  • a strand of interleaved bags is created. This strand is fed to a winding device, in which a roll of bags is formed.
  • the stacking device includes a rotating barrel drum, the periphery of which has a projecting needle. Separated bags are sequentially fed to the barrel drum, where they are threaded onto the projecting needle, thereby creating a stack of overlapping bags on the periphery of the drum. By stopping the drum and retracting the needle, the stack of bags can be transferred to a subsequent discharge device.
  • a winding device in which an endlessly rotating belt is used to feed bags onto a winding core where they are wound into a roll.
  • One object of the invention is to solve or alleviate some or all of the above problems associated with prior art. More specifically, it is an object of the invention to provide a roll-forming apparatus of simple structure, which is capable of winding bags into a roll without the bags being connected to one another and without inflicting any damage to the bags.
  • the apparatus should cause low wear and tear to the included components.
  • a further object is to provide a roll-forming apparatus with little need for control and timing in the production of rolls of bags.
  • Still another object is to provide an apparatus allowing little down-time and high production rates.
  • An additional object of the invention is to provide an apparatus capable of being included in or operated together with conventional bag-making machines.
  • a specific object is to provide a new winding station, which is improved over prior art.
  • Another object of the invention is to provide a method of producing rolls of bags, remedying some or all of the drawbacks discussed above.
  • the invention is based on the understanding that it is possible to dispense with the arranging of the separated bags in an overlapping fashion before winding them into a roll of bags.
  • the feeding means is arranged to feed bags one by one to the winding stations.
  • Each winding station includes a rotating spindle, which is arranged to engage with each bag, directly or via bags previously wound thereon, to form the roll of bags in which the bags are unconnected to one another yet firmly held together.
  • This allows a considerably simplified construction of the apparatus. Since the bags are fed one by one to the winding stations, there is no need for tumbling or reciprocating devices manipulating the leading or trailing ends of each bag. This results in a reduced risk of damage to the bags, as well as low wear and tear in the construction itself.
  • the bags are fed one by one to the winding stations, it is easy to direct the flow of separate bags between different winding stations. This allows high production rates since two or more winding stations can be operated sequentially such that a roll of bags is being formed in one winding station while a finished roll of bags is being discharged from an adjacent winding station.
  • the apparatus preferably comprises a separation device arranged to separate the bags from a continuous web of bag material with perforations in the boundary between adjacent bags. This provides a rational manner of feeding separate bags to the apparatus.
  • the separation device includes a first driven pair of rollers for feeding the web, and an engagement means which is arranged upstream of the first pair of rollers, in the feeding direction.
  • the engagement means is operable to engage the web at least intermittently to thereby separate a bag therefrom. This is a practical way of separating bags from the web.
  • the distance between the engagement means and the first pair of rollers is preferably adjustable to exceed the mutual distance between successive perforations in the web. This provides the possibility of adjusting the separation device to different bag lengths.
  • the engagement means may include a second driven pair of rollers for feeding the web.
  • the feeding rate of the first pair of rollers should exceed the web feeding rate of the second pair of rollers.
  • the feeding means of the apparatus according to the invention preferably comprises at least one driven pair of rollers for feeding a bag to the spindle.
  • the bag feeding rate of this pair of rollers essentially corresponds to a web feeding rate of the first pair of rollers of the separation means. This provides a smooth feeding process.
  • each winding station comprises an abutment means, which is abuttingly arranged on a major portion of the periphery of the rotating spindle.
  • the bags received from the feeding means are engaged between the abutment means and the periphery of the spindle. This provides a simple way of holding the bags against the spindle.
  • the abutment means preferably extends over at least 2/3 of the periphery of the spindle. As a result, the bags are securely held against the spindle.
  • the abutment means is arranged to apply essentially constant force on the roll of bags during formation thereof on the periphery of the spindle.
  • the abutment means preferably comprises at least one movable endless belt, which is arranged to partly encircle the spindle. This is a mechanically simple way of providing an abutment means.
  • the belt of the abutment means should be driven at an essentially constant speed in order to feed the bags smoothly onto the spindle.
  • An effective way of driving the belt of the abutment means is by engagement with the spindle.
  • each winding station comprises a guide means arranged to guide the belt during movement thereof. This prevents the belt from moving sideways during movement.
  • the belt guiding means may comprise a body defining a trench having the shape of an arc.
  • the belt is received in the trench in which perforations are provided in a bottom surface.
  • the perforations are connected to a gas supply device to provide a gas layer between the belt and the bottom surface.
  • the trench prevents the belt from slipping and the gas layer reduces friction between the belt and the trench.
  • the bottom surface of the trench is preferably formed on a peripheral portion of a cylinder, which is fixedly connected to a support of the winding station.
  • Two opposite wall surfaces of the trench are formed by portions of gables, which are arranged at opposite ends of the cylinder.
  • the gables are journaled for free rotation relative to the cylinder, thus reducing friction between the belt and the trench.
  • Each winding station may comprise haul-in means arranged to engage a leading end of a bag with the rotating spindle. This makes for a secure formation of a roll of bags.
  • a first backup roller is arranged against the belt upstream of the rotating spindle, as seen in the direction of belt movement, and a second belt backup roller is arranged against the belt upstream of the rotating spindle, the backup rollers guiding the belt around the rotating spindle.
  • the belt forms a bag haul-in means.
  • At least part of the feeding means is movable relative to the winding station such that, during formation of a roll of bags on the spindle, an essentially constant angle of attack is achieved between a leading end of a bag fed thereto and the haul-in means. This minimizes changes in the flow path of the bags during the roll-forming process.
  • the second belt backup roller has a smaller diameter and is arranged closer to the rotating spindle than the first belt backup roller.
  • the inlet opening defined by the first and second backup rollers can thus be kept small, ensuring that the leading ends of the bags follow the periphery of the spindle.
  • the first and second belt backup rollers and at least part of the feeding means may be arranged at a fixed mutual distance on a movable element, an essentially constant distance being maintained between the movable element and the roll of bags during formation thereof. This provides a way of maintaining an essentially constant force on the roll of bags during the roll-forming process.
  • the rotating spindle is essentially circular in cross section and has a variable diameter.
  • the diameter of the spindle can be facilitated.
  • An effective way of providing a variable diameter of the spindle is to arrange an interior chamber inside the spindle.
  • the diameter can be varied by changing a gas pressure in the chamber.
  • the change of diameter can also be achieved mechanically.
  • the spindle may comprise an elongate body, a tube means of flexible material arranged in a number of turns around the body, and a protective sheet covering the tube means and forming a periphery of the spindle.
  • the tube means By changing the gas pressure in the interior chamber of the spindle, the tube means effects a change of the diameter of the spindle.
  • the protective sheet provides a smooth surface.
  • an improved winding station is provided.
  • the winding station of the invention comprises a switch means which makes it possible to direct bags into the winding station for forming a roll of bags and to direct the bags past the winding station if the roll of bags in the winding station is completed. In this manner, bags can be directed to another winding station in a series of winding stations while a completed roll is being removed from the first winding station. This means that interruptions in the production are avoided.
  • the winding station of the invention is adapted to receive bags from a feeding means comprising a conveyor belt, and the switch means comprises means for diverting the conveyor belt into contact with the winding station.
  • the diversion of the conveyor belt is a simple way of directing the bags into the winding station.
  • the switch means preferably comprises a pivotable arm, which is connected to a roller.
  • the arm is pivotable to bring the roller into engagement with the conveyor belt for diverting the conveyor belt upwards.
  • the winding station is disposed to be arranged above the conveyor belt, giving the possibility of arranging several winding stations in a row.
  • the winding station may comprise a haul-in means arranged to move a bag from the conveyor belt into the winding station and to engage a leading end of the bag with the rotating spindle.
  • the haul-in means is arranged to move the bag from the conveyor belt into the winding station in a direction which is perpendicular to a feeding direction of the conveyor belt. This makes it possible to easily arrange a number of winding stations above the conveyor belt.
  • the haul-in means preferably comprises an endless belt, which is arranged to be brought into contact with the conveyor belt when the conveyor belt is diverted into contact with the winding station. This is a mechanically simple way of providing a haul-in means.
  • an improved winding apparatus comprising at least two of the winding stations of the invention.
  • bags are wound into a roll in one of at least two winding stations, without being connected to one another, fed one by one to a rotational means and wound thereon.
  • the bags are directed to another of the winding stations. This provides an effective way of forming rolls of bags, as it makes it possible to remove a finished roll while another is being formed.
  • Fig. 1 provides a schematic overview of an apparatus according to a first embodiment of the invention.
  • the apparatus comprises a combined feeding and separating unit 1, a switch unit or switch means 2, and first and second winding stations 3, 3'. Between the switch unit 2 and each winding station 3, 3' there is provided a bag feeding device or bag feeding means 4, 4'.
  • the roll-forming apparatus receives a web 5 of bag material, for example from a bag-making machine.
  • bags are defined by welding lines and perforations, in a manner known per se.
  • the feeding and separating unit 1 comprises a driven pair of inlet rollers 6 feeding the web 5 at a first speed. Downstream of the inlet rollers 6, there is provided a driven pair of outlet rollers 7 feeding the web at a second speed, which is higher than the first speed.
  • a driven pair of outlet rollers 7 feeding the web at a second speed, which is higher than the first speed.
  • the separation unit 1 also automatically provides a spacing between each separated bag 5' and the web 5, since the bag 5' is accelerated by the outlet rollers 7.
  • the distance between the inlet and outlet rollers 6, 7 should be adjustable in relation to the length of the bags 5'. Preferably, this distance should equal or exceed the length of each bag 5'.
  • the switch unit 2 comprises a wedge 8, the tip of which is directed towards the separation unit 1.
  • the wedge 8 is slightly rotatable such that its tip is moved sideways a small distance to guide the flow of separated bags 5' from the separation unit 1 to the first or to the second winding station 3, 3'.
  • the feeding device 4 comprises a number of sequential pairs of rollers 9, preferably driven at the same feeding rate as the outlet rollers 7 of the separation unit 1 or at a slightly higher rate.
  • the winding station 3 comprises a rotatable winding spindle 10.
  • the separated bags 5' are fed one by one to the spindle 10 and are overlappingly arranged on the periphery thereof.
  • the bags 5' are successively engaged with the spindle 10, on which a roll of bags is built up.
  • a belt 11 is arranged to encircle a major portion of the periphery of the spindle 10 in order to hold the bags 5' against the periphery of the spindle 10.
  • a number of backup rollers 12 are arranged to guide the belt 11 in an endless loop around the winding spindle 10.
  • a belt tensioning device 13 is connected to one of the backup rollers 12.
  • the belt tensioning device 13 adjusts the tension in the belt 11 to be essentially constant so that an essentially constant force is applied to the bags on the spindle 10.
  • the belt tensioning device comprises a piston/cylinder arrangement in which the cylinder contains a gas held at a constant pressure.
  • the gas provides a constant backing pressure producing a force acting on the piston, which in turn is connected to a backup roller 12 in the winding station 3.
  • the second winding station 3' is identical to the first winding station 3 and a detailed description thereof is therefore not necessary.
  • Figs 2 and 3 show in more detail an embodiment of the winding station, here designated 103, and the associated feeding means, here denominated 104, in an initial and final stage, respectively, in producing a roll R of bags.
  • a second winding station of the same kind is foreseen but not shown in Figs 2 and 3.
  • the switch means 102 directs the bags 105' to one of the winding stations.
  • the winding station 103 is formed around the rotatable spindle 110.
  • the belt 111 preferably made of a material such as rubber, is arranged in an endless loop extending over a number of backup rollers 112, 114, 115 and a belt guide means 116.
  • the surfaces of the belt 111 are flat.
  • the belt tensioning device 113 comprises a tension lever 117 which is pivotable at one end around a pin 118 attached to a frame (not shown) of the winding station 103. At the other end, the tension lever 117 carries a roller 119, which is arranged within the endless loop in contact with the belt 111.
  • the tension lever 117 is connected to a member (not shown) applying tractive forces thereto, such as the piston/cylinder arrangement described above. A spring arrangement may also be used to this end.
  • the winding station 103 comprises an inlet backup roller 114 and an outlet backup roller 115, with respect to the direction of belt movement around the periphery of the spindle 110.
  • the inlet and outlet backup rollers 114, 115 define an inlet opening 120 through which bags 105' are being fed to the spindle 110.
  • This inlet opening 120 should be as small as possible to ensure that the leading ends of the bags 105' follow the periphery of the spindle 110. Therefore, the outlet backup roller 115 has a small diameter.
  • a loop portion 121 extending between the inlet backup roller 114 and the spindle 110 drives the leading edge of each bag 105' into engagement with the spindle 110, or the previous bags 105' wound thereon.
  • the feeding means 104 comprises first and second feeding assemblies 122, 123, each comprising a number of sequential driven pairs of rollers 109.
  • the second feeding assembly 123 is arranged on a holder 124 together with the inlet and outlet backup rollers 114, 115.
  • a control lever 126 is pivotable around a pin 127 attached to the frame (not shown) of the winding station 103.
  • a distal end of the control lever 126 is rotatably attached to a first pin 128 of the holder 124.
  • the outlet backup roller 115 is arranged for free rotation on this first pin 118.
  • the holder 124 has a second pin 129, which is pivotably and slidably received in a bearing (not shown) attached to the frame (not shown).
  • the control lever 126 is biased towards the spindle 110 such that the outlet backup roller 115 is always applied to the periphery of the bags 105' being wound on the spindle 110, thereby directing the leading end of the outermost bag around the spindle 110.
  • an essentially constant angle of attack is achieved between the leading end of each bag 105' and the spindle 110 throughout the roll-forming operation.
  • relative movement is minimised between the first feeding assembly 122 and the facing end of the second feeding assembly 123, thereby minimising changes in the flow path of separated bags 105' during the roll-forming operation.
  • the speed of the belt 111 is kept essentially equal to or slightly higher than the feed rate of the second feed assembly 123 throughout the roll-forming operation, to avoid any stretch or slack in the bag 105' as it is brought into engagement between the belt 111 and the spindle 110.
  • the spindle 110 be connected to a drive means (not shown), such as an electrical motor, and that the belt 111 be driven by engagement with the spindle 110. With such a driven spindle 110, each bag 105' wound onto the spindle 110 will be automatically tightened by a slight slipping action occurring between the belt 111 and the outermost bag 105' in the roll R.
  • the rotating speed of the spindle 110 has to be reduced as the roll R is growing in diameter thereon.
  • a conventional potentiometer (not shown) could be connected to the control lever 126 to monitor the radius of the roll R, and the speed of the spindle 110 could be adjusted accordingly.
  • FIG. 4 is a side view of the spindle 110 and an associated driving means 130.
  • the belt 111 is removed, and the position of a roll R of bags is indicated with dotted lines.
  • the spindle 110 extends through bearings 131 mounted in a block 132, which is carried by the frame 133 of the winding station 103.
  • An electric motor 134 is arranged on the block 132 to rotate the spindle 110 via a belt drive 135.
  • the spindle 110 can be displaced from the roll-forming position of Fig. 4 to a discharge position (not shown) in which the roll R is positioned outside the frame 133.
  • the block 132 is attached to a piston 136 enclosed in a main cylinder 137, which is connectable to a gas supply device G.
  • the displacement of the spindle 110 is effected by increasing the gas pressure at the respective end 138, 139 of the main cylinder 137.
  • the spindle 110 should preferably have a smooth and circular circumferential surface so that the belt 111, and the bags 105', can be firmly arranged around a major portion thereof.
  • a smooth surface makes it difficult to remove the finished roll R of bags, since the bags tend to adhere to the surface.
  • the spindle 110 is essentially circular in cross section and has a variable diameter.
  • the spindle 110 comprises an elongate hollow pipe 140, preferably of metal, the ends of which are sealed and provided with an outlet and an inlet valve 141, 142, respectively.
  • a tube 143 of flexible material such as a silicon material, is arranged in several turns around the periphery of the pipe 140, one end of the flexible tube 143 being communicated with the interior of the pipe 140 and the other end being closed.
  • a sheet 144 preferably of a flexible material, e.g. a plastic material, is arranged around the turns of flexible tube 143 to provide a smooth circumferential surface.
  • the longitudinal ends of the sheet 144 are arranged to overlap without being physically connected.
  • the diameter of said spindle 110 can be controlled. It is to be understood that only part of the spindle 110 needs to be provided with such a controllable diameter.
  • the spindle 110 is first moved a short distance away from the discharge position by means of the cylinder 137 to disengage a bearing 146.
  • the bearing 146 is folded away by means of hinges (not shown).
  • the spindle is advanced, by pressurizing one end 138 of the main cylinder 137, so that the roll R is brought outside the frame 133.
  • On advancing the spindle 110 its outlet valve 141 is engaged with a stop means (not shown) so that gas is released from the spindle 110, thereby decreasing its diameter. Due to the reduced diameter of the spindle 110, the roll R of bags is easily removed.
  • the spindle is retracted by pressurizing the opposite end 139 of the main cylinder 137.
  • the bearing 146 is returned to its original position and by means of a secondary gas-actuated piston 145 connecting the block 132 to the main cylinder 137 the spindle is returned to engagement with the bearing 146.
  • the spindle 110 is returned to the roll-forming position its inlet valve 142 is engaged with a connector 147 of a gas supply device G.
  • the diameter of the spindle 110 is again increased before a first bag 105' is wound thereon.
  • the spindle 110 can be slowly rotated during the above operation.
  • the winding station 103 comprises a belt guide means 116, as shown in Figs 2-3, which will be further described with reference to Fig. 6.
  • a large-diameter hollow cylinder 150 is coaxially arranged on a pipe 151 and secured against rotation by means of a pin 152 extending through the pipe 151.
  • Two gables 153 are arranged adjacent to a respective end of the cylinder 150. Each gable 153 is connected to a bearing 154 fixed to the pipe 151.
  • the extremities 155 of the gables 153 project beyond the peripheral surface 156 of the cylinder 150, thereby forming a chute or a trench 157 in which the belt 111 is to be received.
  • Each extremity 155 is formed to provide a first surface 158, which is level with the peripheral surface 156, and a second surface 159, which is inclined away from the first surface 158 and forms a side wall of the trench 157.
  • a gas layer is provided between the belt 111 and the peripheral surface 156 of the cylinder 150.
  • the pipe 151 is connected to a gas supply device G and the wall of the pipe 151 has openings communicating the interior of the pipe 151 with the interior of the cylinder 150.
  • the peripheral surface 156 is provided with holes or perforations P, through which gas from the gas supply device is ejected.
  • the large-diameter cylinder 150 with journaled gables 153 effectively prevents the moving belt 111 from climbing off the cylinder 150, and provides low friction between the gables 153 and the belt 111. Friction is further reduced by the gas layer between the belt 111 and the peripheral surface 156.
  • the cylinder 150 is preferably stationary, since this simplifies the interconnection between the pipe 151 and the cylinder 150.
  • an alternative winding apparatus is provided.
  • Two or more winding stations 203a, 203b, 203c may be arranged in series, as shown in Fig. 7.
  • three winding stations 203a, 203b, 203c are arranged above an endless conveyor belt 204.
  • Switch means 202a, 202b, 202c are included in each winding station 203a, 203b, 203c.
  • the structure of the winding station is similar to that of the winding station described in conjunction with Figs 2-6. Similar parts have been given numerals similar to those of Figs 2-6.
  • the winding stations 203a, 203b, 203c each have a tiltable frame 218, a rotating spindle 210, a first belt 211, which is arranged around a number of rollers 212 and driven by a motor 228, a belt tensioning device 213, a second belt 223 which is arranged around three rollers 224, 225, 226 and driven by the motor 228, and a switch means 202.
  • the winding stations 203a, 203b, 203c receive bags that are separated from a web of bag material using a separation unit, such as the one shown in Fig. 1. However, the distance between the inlet rollers 6 and the outlet rollers 7 need not be adjustable.
  • the separated bag 205' is fed onto the conveyor belt 204 on which it is transported to one of the winding stations 203a, 203b, 203c. While being transported on the conveyor belt 204 the bag 205' is retained thereon by means of static.
  • the bag 205' may also be retained using vacuum or bands.
  • the conveyor belt 204 is made of an elastic material, e.g. rubber.
  • the switch means 202a, 202b, 202c is used to direct the bag 205' towards one of the winding stations 203a, 203b, 203c.
  • Each switch means 202a, 202b, 202c consists of a pivotally mounted arm 220, which is connected to a roller 222. In an inactive stage, the roller 222 is placed under the top part -of the conveyor belt 204.
  • a cylinder 227 pushes the arm 220 to bring the roller 222 into contact with the top part of the conveyor belt 204 and divert the conveyor belt 204 upwards.
  • This operation directs the bag 205' upwards towards the corresponding winding station 203a, 203b, 203c.
  • the conveyor belt 204 is preferably diverted so that the feed direction is diverted perpendicularly to the original feed direction.
  • the second belt 223 is placed around three rollers 224, 225, 226, forming a triangular loop with one side being essentially vertical.
  • the switch means When the conveyor belt is diverted by the switch means, it is brought into contact with the second belt 223, which engages the bag 205' and moves it upwards into engagement with the first belt 211.
  • the second belt 223 and the part of the first belt between the inlet backup roller 214 and the spindle 210 form a haul-in means 221.
  • the haul-in means 221 moves the bag 205' from the conveyor and feeds the bag 205' onto the spindle 210 on whose periphery it is overlappingly arranged.
  • the first belt 211 encircles a major portion of the spindle 210 in order to hold the bags 205' against the periphery thereof.
  • the first belt 211 is placed around a number of backup rollers 212, which are mounted on a frame 218 and which guide the belt in an endless loop around the spindle 210.
  • the belt tensioning device 213 consists of a lever 217, which is pivotably connected at one end to the tiltable frame 218. At the other end, the lever 217 is connected to a roller 219. Approximately midway along the lever 217 a cylinder (not shown) is connected between the lever 217 and the frame 218.
  • the first belt 211 is placed around the roller 219.
  • the lever 217 is pivoted by means of the cylinder, changing the position of the roller 219 relative to the backup rollers 212, thus changing the shape of the loop formed by the first belt. This provides a way of applying an essentially constant force on the bags 205' on the spindle 210.
  • pairs of rollers could also be used, such as the ones described in connection with Fig. 1.
  • the rotating spindle 210 has a variable diameter and is of the same kind as the spindle 110 described in conjunction with Fig 5.
  • the arrangement of three winding stations 203a, 203b, 203c in one roll-forming apparatus provides ample time for removal of completed rolls and for the necessary adjustments and servicing of the winding stations 203a, 203b, 203c without interruptions in the production.
  • the arrangement of the winding stations 203a, 203b, 203c makes it possible to use as many winding stations as desired.
  • a bellow means can be incorporated in the spindle instead of the flexible tube to provide the desired radial expansion and contraction.
  • a spring may be provided which changes its diameter on elongation and compression. It should also be understood that a plurality of narrow belts could be used instead of a single wide belt.
  • the invention is in particular applicable to plastic bags, but it is understood that the inventive concept can be used for other materials.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
EP01850137A 2001-08-03 2001-08-03 Méthode et dispositif pour produire des rouleaux de sacs Withdrawn EP1281649A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01850137A EP1281649A1 (fr) 2001-08-03 2001-08-03 Méthode et dispositif pour produire des rouleaux de sacs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01850137A EP1281649A1 (fr) 2001-08-03 2001-08-03 Méthode et dispositif pour produire des rouleaux de sacs

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703951A (en) * 1969-06-11 1972-11-28 Windmoeller & Hoelscher Apparatus for transferring workpieces which are intended for the manufacture of bags
US3859898A (en) * 1971-11-12 1975-01-14 Fmc Corp Method of and apparatus for stacking flexible articles
US4528798A (en) * 1983-02-21 1985-07-16 Ferag Ag Method and apparatus for storing continuously arriving flat structures, especially printed products arriving in an imbricated product formation
CH663602A5 (de) * 1983-09-15 1987-12-31 Peter Balzer Verfahren zum wickeln von erzeugnissen aus flexiblem material und wickelvorrichtung zur ausfuehrung des verfahrens.
US4875671A (en) * 1988-05-20 1989-10-24 Eastman Kodak Company Transporting and sorting system for a flexible workpiece
US5234211A (en) * 1992-02-18 1993-08-10 Eastman Kodak Company Diverter assembly
EP0595555A1 (fr) * 1992-10-27 1994-05-04 Cmd Corporation Méthode et appareil pour faire de chevaucher des sacs en plastique
US5318237A (en) * 1992-10-08 1994-06-07 Fmc Corporation Air horn for web winding machine
US5337968A (en) * 1990-04-04 1994-08-16 Fmc Corporation Apparatus for rolling up web material
EP0837020A2 (fr) * 1996-10-18 1998-04-22 Fmc Corporation Bobineuse à utiliser avec une machine de fabrication de sacs

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703951A (en) * 1969-06-11 1972-11-28 Windmoeller & Hoelscher Apparatus for transferring workpieces which are intended for the manufacture of bags
US3859898A (en) * 1971-11-12 1975-01-14 Fmc Corp Method of and apparatus for stacking flexible articles
US4528798A (en) * 1983-02-21 1985-07-16 Ferag Ag Method and apparatus for storing continuously arriving flat structures, especially printed products arriving in an imbricated product formation
CH663602A5 (de) * 1983-09-15 1987-12-31 Peter Balzer Verfahren zum wickeln von erzeugnissen aus flexiblem material und wickelvorrichtung zur ausfuehrung des verfahrens.
US4875671A (en) * 1988-05-20 1989-10-24 Eastman Kodak Company Transporting and sorting system for a flexible workpiece
US5337968A (en) * 1990-04-04 1994-08-16 Fmc Corporation Apparatus for rolling up web material
US5234211A (en) * 1992-02-18 1993-08-10 Eastman Kodak Company Diverter assembly
US5318237A (en) * 1992-10-08 1994-06-07 Fmc Corporation Air horn for web winding machine
EP0595555A1 (fr) * 1992-10-27 1994-05-04 Cmd Corporation Méthode et appareil pour faire de chevaucher des sacs en plastique
EP0837020A2 (fr) * 1996-10-18 1998-04-22 Fmc Corporation Bobineuse à utiliser avec une machine de fabrication de sacs

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