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
  • B65H29/38—Delivering or advancing articles from machines; Advancing articles to or into piles by movable piling or advancing arms, frames, plates, or like members with which the articles are maintained in face contact
  • B65H29/40—Members rotated about an axis perpendicular to direction of article movement, e.g. star-wheels formed by S-shaped members
• • 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
  • B31B70/92—Delivering
  • B31B70/98—Delivering in stacks or bundles
  • B31B70/984—Stacking bags on wicket pins
• • 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
  • B65H2701/12—Surface aspects
  • B65H2701/121—Perforations
  • B65H2701/1212—Perforations where perforations serve for handling
• • 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 invention relates to a device for depositing and stacking bags with bottom seam, which are made from a batch of tubular film made of thermoplastic material by welding and cutting transversely to the direction of advance, with ta working welding and cutting device for welding the bottom seam and Separating the bags transversely to the feed direction and with a downstream stacking and conveying device with strip-shaped traverses fastened transversely to the feed direction on a movable support, which are equipped with vertically upward holding elements in the form of pins, stacking tubes or the like on which the separated bags are placed become.
• a generic device is known for example from DE-OS 23 05 800, in which the holding elements for receiving the bags are rigidly attached to endless, intermittent belts and are oriented vertically upward only in the receiving position for the bags. The bags are gripped by the holding elements before they are separated from the tubular film. With this device, the bags can be stored loosely in stacks, the simultaneous blocking of the bags in stacks at the depositing point cannot be carried out.
• Devices for producing interlocked stacks of bags with bottom seam are for example from DE-OS 22 54 448 and
• the invention has for its object to enable the placement and stacking of bottom seam bags on holding elements and also the transfer to wire brackets (on Wi ⁇ kets) or the blocking of bags deposited in such a way.
• the device is intended to enable a production process of the bags with bottom seam made of thermoplastic plastic films that can be carried out without interruption, ie without empty cycles, at high production speed.
• a device of the generic type is designed in such a way that the crossbeams are articulated and guided on the circumference of the rotatably, in particular in the manner of an impeller, and arranged vertically to the plane of the lift, so that the crossbeams are in circulation with the support, the holding elements maintain their vertically aligned position.
• the stacking and conveying device is designed as a rotary pin stacker, the deposited stacks are moved in batches on a circular path in the vertical plane; Bags with bottom seams can be stacked in a variety of designs.
• the stacks can be stored loosely or blocked and hung in wickets. Blocking welds and punching holes for the wicket hoops can be carried out together.
• the holding elements can be designed as pins for hanging the bags on their hanging holes or with needles for picking up the bags.
• the rotary carrier is equipped with eight cross members arranged at uniform intervals over the circumference and has a corresponding number of eight standstill positions during one revolution, which can be reached step by step from the individual cross members in a stacking cycle.
• the traverses can be moved further from the receiving position of the bags into a higher position.
• a feed device for wicket stirrups is assigned to a rest position of a traverse following the receiving position.
• the rotation carrier for the crossbeams is designed, for example, in such a way that the crossbeams can be separated from one another by the number of the same distances over the circumference
• Rotary bearer are distributed.
• the number of trusses and the size also depend on the maximum to be put down B eutelales, at, for example 600 mm maximum bag length are provided 6 or 8 traverses. Two or more bags can also be placed next to each other in multi-lane production.
• the distance between the individual trusses should be at least about half of the maximum bag length.
• the traverses, - are mounted on the side constituting the rotation wing support rods, the end points of a polygon corresponding to the number of the crosspieces with a corresponding number of resting positions, forming in a recirculating path. At least the following working positions in the direction of circulation are provided in succession on a circulation route:
• the drive of the rotation carrier can be controlled by a counter which is pulse-controlled by the welding station for a cyclical rotation after the number of bags specified for a stack has been reached, corresponding to the number of weldings carried out, by an angle corresponding to the spacing of the crossbeams.
• the trusses are equipped with stacking tubes that are open on one side in particular, usually in accordance with the arrangement of pairs
• Hanging holes also in pairs.
• the stacking tubes are screwed, for example, at predetermined intervals from one another into threaded holes predrilled in the crossbeams.
• several pairs of stacking tubes can be arranged side by side on the trusses; eg two pairs for two-lane operation, three pairs for three-lane operation, etc.
• the crossbeams with the holding elements are guided in the side wing bars of the rotary carrier in such a way that the crossbeams do not twist as they rotate and thus the holding elements, such as stacking tubes and pins, always remain unchanged in the vertical position.
• the diameter of the holding elements is in relation to the diameter of the opening holes punched into the bags, for example if the suspension holes have a diameter of 12 mm, the stacking tube should have a smaller outside diameter of, for example, 6 to 8 mm. " - ⁇
• the correct positioning of the stacking tubes at the stacking position of the bags, ie immediately behind the welding device, is important. It must be taken into account that the required distance between the top of the hanging hole and the top of the bag can be strictly observed, since this guarantees that the bag will be torn off cleanly from the blocked stack during subsequent filling. Punching the hanging holes including
• Tear-off perforation slit takes place in particular immediately in front of the welding and cutting station, so that this guarantees positioning within a minimum tolerance range, i.e. within the feed and section length tolerance is possible.
• the device according to the invention is therefore designed in such a way that the rotation support is subsequently assigned to the welding and separation station and that the top position of the holding elements of a cross member is aligned with the transport plane of the film tube or slightly below the same, in a position of the rotation support that serves to hold the bag
• ⁇ lie. It is further provided that in the space between the welding beam of the welding station which can be carried out a lifting movement transversely to the transport plane and a traverse in the bag receiving position, a lifting movement which can be carried out parallel to the welding beam is carried out immediately in succession Cutting knife above, a support bar below and a lifting movement executable pressure bar are arranged above the transport level.
• This pressure bar can optionally also be equipped with spot welding heads "in order to block the bags in the area of the bag opening or their upper flap when stacked on top of each other to form a 3-bag stack.
• Cutting device it is important to be able to use a heated cutting knife, which enables a clean cut and a long service life of the cutting knife.
• the welding, cutting and bag stacking system according to the invention almost completely rules out malfunctions in automatic production and thus offers a very high level of production reliability and economy.
• the crossbeams are equipped with storage combs, which are particularly curved in
• the feed direction serves as a support for the bags. This also delays the fall of the bag bottom provided with the weld seam and promotes cooling of the weld seam, so that sticking of the weld seams is avoided.
• the traverses are provided on the upper side with groove cutouts which serve to immerse the take-over comb for the stack of bags when the same is removed from the removal station of the rotary carrier for forwarding to the packaging.
• Figure 4 shows the schematic supervision of the manufacture of the bag from a film tube
• Figure 6 shows the schematic supervision of a
• Figure 9 is a schematic representation of the welding and cutting station with stacking and conveying device with 'rotation carrier in a schematic representation.
• Figures 1 to 3 show examples of bags 1 made of thermoplastic plastic film with bottom weld seam 7 and inserted side gussets 2.
• the bags have in the area of the bag opening 6. an upper flap 4 projecting on one side on the rear wall with two hanging holes 3, at a small distance in the direction the tear-off perforation slots 5 are assigned to the outer edge of the tab.
• These bags k LEVERAGING, as shown in Figure 3, yet a punched G riffloch 10 have.
• they can also have a tear-off perforation line 11 above the bag opening 6, along which the bag 1 can be torn from the upper flap 4.
• the bags can also be blocked together in the stack in the area of the upper flap by spot welds 8, as shown in FIG. 2.
• these spot welds can be punched out, for example, along the lines 9 shown in broken lines. These can also be designed as tear-off perforations 9.
• the bags 1 arranged one above the other in a stack can then be held on wickets or wire hangers inserted through the hanging holes 3.
• the bottom seam bags with side gussets and top flap shown in FIGS. 1 to 3 can be filled very easily since the front wall is exposed at the bag opening 6 below the hanging holes 3. Bags with a bottom seam without an upper flap can also be formed, in which the hanging holes 3 go through both bag walls.
• FIG. 4 schematically shows the development of the bag 1 according to FIG. 1 in the case of two-lane manufacture from a film tube 100 with feed direction A.
• the side gussets 5 are inserted into the film tubes, then in a cutting and punching station I by cutting out an upper side Foil strip configured the top tab 4 and punched the hanging holes 3 and tear-off perforation slots 5.
• the film web 100 is continued in cycles by one bag length through the welding and separating station II, and the bottom weld seam 7 for closing the end of the film tube and the separating cut 12 for separating the leading bag 1 are carried out.
• the film tube is continued in a position corresponding to the desired bag length with the bottom seam first and, in the advanced position, the area adjacent to the separating cut to be produced with the receiving holes is positioned via correspondingly assigned holding elements 21 and then simultaneously with or immediately after the implementation the cut pressed on the holding elements.
• the holding elements are continued in the stacking cycle on a circular circulation path that starts upwards. The holding elements are advanced immediately after the placement and cutting of the last bag belonging to a stack has been completed while the associated process of welding the bottom seam of the next bag is carried out.
• the film web 100 which is already equipped with the top flap 4 and the suspension holes 3 with tear-off perforation slot 5, is advanced in the feed direction A by means of feed rollers 31 through a comb guide 32 until the set bag length is reached
• Welding device 33a, 33b advanced in sections. After passing the welding device towards the bottom seam at the end of the bag, the film web which is loose is initially supported on the "underside arranged transversely to the feed direction
• the upper part of the welding device with welding bar 33a, cutting knife 34 and bag pull-off bar 36 lowers.
• the cutting knife 34 and the bag pull-off strip 36 simultaneously touch the film web 100 and perform the separating cut and the pressing down of the bag separated by the cut along the support strip 35 up to and below it, see FIG from the pre-punched suspension holes 3 on the associated holding elements, for example stacking tubes 21, while .seam welding 7 is carried out along the other side of the cut edge.
• the holding elements are with their heads directly below the feed plane, i.e. Welding level arranged.
• the stacking tubes 21 are equipped, for example, with a slot 211 on one side for wire clips, see FIG. 6.
• the holding elements 21 are fastened on cross members 20, for example round rods or square strips, for example screwed in.
• the cross members preferably have a plurality of screw-in holes for receiving the desired number of holding elements for different distances.
• two pairs of holding elements 21 are provided next to one another at a corresponding distance, as can be seen, for example, from the view in FIG.
• the traverses .20 are articulated and guided on the circumference of the rotation carrier 40.
• the 10 40 is designed as an impeller with wing bars extending radially from the hub ⁇ ' -41 and tangential to the ends of the wing bars associated guides 42 which guide the ends 202 of the crossbeams, see FIGS. 5 and 9.
• the guides 42 have the effect that when the carrier 40 rotates in the direction of the arrow C, L, the stacking tubes 21 on the cross members maintain their vertical position even during the entire rotation of the cross members with the rotary carrier 40.
• the rotation carrier 40 is equipped with eight cross members 20, which are arranged evenly distributed over the circumference. The rotation carrier is arranged immediately after the welding device in such a way that, as explained with reference to FIGS. 7 and 8, the cut-off bags 1 can be automatically stacked on the holding elements 21 of the cross members.
• Rotational feed takes place immediately after completion of the Ablagvorga ges of the last bag on the holding elements 21 of position 40a, that is, still during the welding process. It is thereby achieved that the next traverse, which 5 is still in position 40h, is already in the working position before or immediately after the next stack transport has started, that is to say. be moved to position 40a 1 can and the production process can continue continuously.
• Position 40c is assigned a feed device for wire bracket 30. Beer is automatically fed wire stirrups 30 in the direction of arrow F from a magazine arranged above position 40c, i.e. inserted from above into the holding elements designed as stacking tubes according to FIG. 6. With the next feed, which takes place with an eighth revolution of the rotary carrier 40, the stack of bags equipped with the wire clips 30 reaches the position 40d.
• the stack of bags 1 can be removed by robotic hand from the stack tubes, which are open on one side, and can be placed in the packaging boxes provided.
• the schematically indicated robotic hand 29 can be designed in the form of a take-over comb which dips into the groove recess 26 of the crossmember 20, see FIG. 5, by immersing the stack of bags and removing it from the stacking tube by lifting it up.
• the empty cross beams then pass from the receiving station 40d through the space stations 40e, 40f, 40g and 40h back to the 'bag-mounting station 40a.
• the trusses can be provided on the upper side with guide plates 25, which can be adjusted depending on the width of the bags to be placed.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Making Paper Articles (AREA)
• Bag Frames (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6320982

Family Applications (1)

Country Status (5)

Families Citing this family (16)

Family Cites Families (17)

• 1987
  • 1987-02-14 DE DE3704663A patent/DE3704663C2/de not_active Expired - Fee Related
  • 1987-02-14 DE DE8717635U patent/DE8717635U1/de not_active Expired
• 1988
  • 1988-02-10 EP EP88901590A patent/EP0363359A1/de not_active Withdrawn
  • 1988-02-10 WO PCT/EP1988/000098 patent/WO1988006091A1/de not_active Application Discontinuation
  • 1988-02-10 AU AU12432/88A patent/AU1243288A/en not_active Abandoned
  • 1988-02-10 US US07/391,570 patent/US5030191A/en not_active Expired - Fee Related

Non-Patent Citations (1)

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