US3543980A - Apparatus for conveying workpieces of paper or plastics material sheeting,preferably for bag-making machines - Google Patents

Apparatus for conveying workpieces of paper or plastics material sheeting,preferably for bag-making machines Download PDF

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Publication number
US3543980A
US3543980A US748550A US3543980DA US3543980A US 3543980 A US3543980 A US 3543980A US 748550 A US748550 A US 748550A US 3543980D A US3543980D A US 3543980DA US 3543980 A US3543980 A US 3543980A
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US
United States
Prior art keywords
vacuum
grippers
roll
workpieces
velocity
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
US748550A
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English (en)
Inventor
Friedrich Franz Brockmuller
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
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
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Publication of US3543980A publication Critical patent/US3543980A/en
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Expired - Lifetime 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
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/02—Feeding sheets or wrapper blanks
    • B65B41/04—Feeding sheets or wrapper blanks by grippers
    • B65B41/06—Feeding sheets or wrapper blanks by grippers by suction-operated grippers
    • 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
    • B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
    • B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
    • B65H29/042—Intermediate conveyors, e.g. transferring devices
    • 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
    • B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
    • B65H29/241—Suction devices
    • B65H29/243—Suction rollers
    • 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
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/447—Moving, forwarding, guiding material transferring material between transport devices
    • B65H2301/4471—Grippers, e.g. moved in paths enclosing an area
    • B65H2301/44712—Grippers, e.g. moved in paths enclosing an area carried by chains or bands
    • 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
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/447—Moving, forwarding, guiding material transferring material between transport devices
    • B65H2301/4474—Pair of cooperating moving elements as rollers, belts forming nip into which material is transported
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/307—Combined with preliminary weakener or with nonbreaking cutter
    • Y10T225/321—Preliminary weakener
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/35—Work-parting pullers [bursters]

Definitions

  • the spacing of the grippers is smaller than the length of the workpieces.
  • An input feed roll is provided at the charging station [54] APPARATUS FOR CONVEYING WORKPIECES F for the gripper chains and revolves oppositely to the reversing PAPER OR PLASTICS MATERIAL SHEETING, s rockets of the h b0 t h a I PREFERABLY ron BAG-MAKING MACHINES P c am a u 7 Claim 4 D in to the axes of said sprockets and at a peripheral velocity which is higher than the velocity of the grippers.
  • the communication between said Field of Search 271/5], vacuum openings and a vacuum conduit is interrupted when the vacuum openings contact the path of the grippers.
  • Patented 1 1970 3,543,980
  • FIG.'3 FIGA INVENTOIv ama/f Rama/valua- HTr RIvEyS APPARATUS FOR CONVEYING WORKPECES OF I PAPER R PLASTICS MATERIAL SHEETWG, PREFERABLY FOR BAG-MAKING MACHHNES
  • This invention relates to an apparatus for conveying workpieces of paper or plastics material sheeting, preferably for bagmaking machines, in which the workpieces are fed at a high velocity of travel and are inserted with their leading end into grippers carried by gripper chains, which revolve at a lower velocity, the spacing of the grippers being smaller than the length of the workpieces.
  • an input feed roll is provided at the charging stationfor the gripper chains and revolves oppositely to the reversing tion.
  • a transverse weakening or transverse cutting device is provided in the production machine consisting, e.g., in a tube making machine, the peripheral velocity of the input roll may even exceed to some extent the velocity of travel in the production machine and the input roll may coact with a second roll so that these two rolls form at the same time the required tear-off rolls.
  • the input roll may suitably have series of vacuum holes which are disposed between the recesses for the passage of the grippers and which are spaced around the periphery of the input roll and communicate with axial vacuum ducts and the vacuum ducts may open into an end face of the input roll may be covered there by a control ring, which is in sealing contact with the end face and connects the vacuum ducts to the vacuum conduit only in the vacuum zone by means of a recess. It will be particularly desirable if, in a further embodiment of the invention, a controllable shutoff valve is provided in the vacuum conduit close to the input roll and said valve is open only while a workpiece is being fed by the input roll.
  • the controlled shutoff valve prevents an establishment of atmospheric pressure in the entire vacuum conduit leading to the vacuum pump when a workpiece which is fed to the gripper chains is withdrawn form the vacuum rolls but only the short length of the vacuum conduit leading to the shutoff valve so that it will be sufficient to reestablish the vacuum in this short portion of the vacuum conduit during another vacuum operation and a corresponding opening operation of the shutoff valve.
  • the control device for the shutoff valve may comprise a cam which performs one revolution per cycle of the production machine and which is formed by two cam discs that are relatively rotatably mounted on a drive shaft and can be fixed in position and have cam faces forming together the cam.
  • the input feed roll sucks the workpieces and positively moves them at high velocity into the range of the grippers, which grip them at the leading edge and advance them at the lower velocity at which the gripper chains revolve.
  • the recesses on the periphery of the vacuum roll enable the passage of the outer gripper parts as the workpieces are being gripped. Because the vacuum is interrupted when the vacuum holes contact the grippers, a perfect transfer to the grippers is facilitated.
  • the trailing portion of the workpiece is advanced in the direction of travel of the gripper chains with formation of a loop while the leading portion of the workpiece is being torn off by the grippers so that said trailing portion cannot cover the subsequent gripper and the latter can properly receive the next workpiece, which is fed by the input feed roll.
  • the point of contact between the input roll and the gripper path may lie adjacent to the lower half of the reversing sprockets, around which the gripper chains move into their lower course.
  • peripheral velocity of the input roll is equal to the velocity at which the workpieces travel in preceding production machine.
  • a retarding device between the production machine and the gripper chains which lead to the delivery stament enables an exact adjustment of the beginning, end, and duration of the action of vacuum at the vacuum roll in dependence on the length of the workpiece.
  • FIG. 1 is a transverse sectional view showing those parts of a conveying apparatus according to the invention which are required for an understandingof the invention in conjunction with a transverse cutter of a tu'bemaking machine.
  • FIG. 2 is a fragmentary top plan view showing the apparatus of FIG. 1.
  • FIG. 3 is a front elevation showing an adjustable cam for controlling the shutoff valve, partly in section, and
  • FIG. 4 is a side elevation showing-the cam of FIG. 3.
  • the illustrated apparatus consists essentially of a pair of rolls 1, 2 and an endless gripper chain 3, 3', which has a peripheral velocity that is smaller than the velocity at which the workpieces W are fed by the pair of rolls 1, 2.
  • the workpieces W consist of tubes of plastics material sheeting and are used in the manufacture of bags.
  • the gripper chains consist of two parallel endless chains 3, 3', which revolve in the direction of the arrow a around the reversing sprockets 4, 4.
  • the spacing of the chains 3, 3' is equal to the width of the widest workpieces W which are to be conveyed.
  • Carrying bars 5 are carried between the chains and a plurality of grippers 6 are secured to said carrying bars and extend on a straight line.
  • the carrying bars 5 are secured at their ends to the chains.
  • the pitch t of the gripper assemblies 5, 6 on the gripper chains is smaller than the length of the workpiece W in the direction of travel.
  • the grippers 6 on each carrying a bar are opened and closed in known manner by means of lateral roller levers 7 and stationary cams 8.
  • the lower roll 2 of the pair of rolls 1, 2 consists of an input vacuum roll and is so arranged adjacent to the lower half of those reversing sprockets 4, 4' around which the gripper chains 3 to 7 move into their lower course that the roll 2 contacts the circular path k on which the grippers move around the reversing sprockets 4, 4.
  • the input feed roll 2 has recesses 9 which are formed in those planes which are at right angles to the roll axis and in which the grippers move. These recesses permit of an opening movement of the grippers.
  • the roll 2 further has series of vacuum holes on its periphery between the recesses.
  • the vacuum holes areradial and communicate with a circular series of axial vacuum ducts 11, which are formed inside the input roll and open at an end face of said roll.
  • the circular series of the openings of the vacuum ducts 11 is covered by a valve ring 12, which is in sealing contact with the end face of the vacuum roll.
  • the valve ring is urged by spring 13 against said end face and is held againstrotation by a locking pin 14.
  • Adjacent to the circular series of the openings of the vacuum ducts 11, the valve ring has an aperture 15, which extends in the range of the angle y from the plane x-x in which the pair of rolls 1, 2 contact and in the direction of travel approximately to the circle k on which the gripper 6 moves.
  • the aperture 15 is connected by the vacuum conduit 16 to the vacuum pump 17.
  • the valve ring connects the vacuum conduit 16 only to those vacuum ducts 1 1 which terminate adjacent to the aperture 15 so that only those vacuum bores 10 can exert a vacuum action which are moving through the range of the angle y.
  • the angle y defines the vacuum zone of the input roll 2. The workpiece is held on the periphery of the input roll 2 by the vacuum action in said vacuum zone.
  • the vacuum in the input roll and the vacuum conduit is broken as a result of the equalization of pressure with the atmosphere as soon as the trailing end of the workpiece exposes the vacuum openings 10 in the vacuum zone y.
  • the new workpiece might be seized by the input roll too late and might not be properly fed to the grippers of the gripper chain. Such an occurrence is prevented by the shutoff valve 18, which is incorporated in the vacuum conduit 16 as closely as possible to the feed roll 2.
  • the shutofi valve is controlled by a cam 19, which performs one revolution per cycle of the production machine.
  • the cam 19 is secured to the cutter shaft 20 of the transverse cutter 21 in such a manner that the shutoff valve is opened as the leading edge of the workpiece enters thenip of the pair of rolls 1, 2 and the valve is closed as the trailing edge of the workpiece leaves the nip.
  • the vacuum line conduit remains constantly evacuated from the vacuum pump 17 to the shutoff valve 18 and is sufficient to evacuate the short conduit 16 and those narrow ducts 10, 1 1 of the input roll 2 when the workpiece enters the nip of the pair of rolls 1, 2, which enter the region of the aperture 15 in the valve ring 12.
  • the cam 19 is adjustable as is shown in FIGS. 3 and 4.
  • the cam 19 consists of two individual cam wheels 19, 19, which have the same smaller and larger radii, respectively.
  • the camwheels are relatively adjustable along the arcuate slot 22 to vary the length of the effective cam face in adaptation to workpieces having different lengths.
  • the cam 19 is detachably secured to the cutter shaft by means of the setscrew 23 so that the beginning of the rise and with it the beginning of the opening operation of the shutoff valve 18 can be timed to agree exactly with the arrival of the leading edge of the workpiece at the pair of feed rolls 1 2.
  • the pair of rolls 1, 2 serve at the same time as tear-off means, which tears off and singles the tube sections W in known manner from the tubing B, which has been perforated by the transverse cutter 21.
  • the peripheral velocity of the pair of rolls 1, 2 is higher than the velocity at which the tubing travels in the tube making machine.
  • the later velocity is the same as the peripheral velocity of the pair of feed rolls 25.
  • the gripper chains 3, 3' are positively driven with an adjustable phase relation by gears or chains, not shown on the drawing, from the cutter shaft 20 of the transverse cutter 21. This arrangement ensures that the circle k on which the grippers 6 move will always be reached by the workpiece W at a time where a series of grippers 6 is disposed on said circle.
  • the tube sections are deposited by the grippers 6 on the belt 24 in shingled form.
  • Apparatus for conveying workpieces of paper or plastics material sheeting in which the workpieces are fed at a high velocity of travel and are inserted with their leading end into grippers carried by gripper chains, which revolve ata lower velocity, the spacing of the grippers being smaller than the length of the workpieces, characterized in that an input feed roll is provided at the charging station for the gripper chains and revolves oppositely to the reversing sprockets (4, 4') of the gripper chains about an axis which is parallel to the axes of said sprockets and at a peripheral velocity which is higher than the velocity of the grippers, the roll contacts the path of the grippers along a generatrix and is provided with peripheral recesses enabling a passage of the grippers therethrough and with vacuum openings on its peripheral surface between the recesses, and the communication between said vacuum openings and a vacuum conduit is interrupted when the vacuum openings contact the path of the grippers.
  • Apparatus according to claim 3 characterized in that the production machine comprises a transverse weakening or transverse cutting machine and the peripheral velocity of the input roll exceeds to some extent the velocity of travel in the production machine and the input roll coacts with a second roll to tear off individual tube sections.
  • Apparatus according to claim 1 characterized in that a' controllable shutoff valve is provided in the vacuum conduit" close to the input roll and said valve is open only while a work-* piece is being fed by the input roll.
  • control device for the shutofl valve comprises a cam, which is

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Advancing Webs (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Making Paper Articles (AREA)
US748550A 1967-08-03 1968-07-29 Apparatus for conveying workpieces of paper or plastics material sheeting,preferably for bag-making machines Expired - Lifetime US3543980A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW0044501 1967-08-03

Publications (1)

Publication Number Publication Date
US3543980A true US3543980A (en) 1970-12-01

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Application Number Title Priority Date Filing Date
US748550A Expired - Lifetime US3543980A (en) 1967-08-03 1968-07-29 Apparatus for conveying workpieces of paper or plastics material sheeting,preferably for bag-making machines

Country Status (5)

Country Link
US (1) US3543980A (fr)
DE (1) DE1611416B1 (fr)
FR (1) FR1575295A (fr)
GB (1) GB1226617A (fr)
NL (1) NL6811061A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687447A (en) * 1970-01-16 1972-08-29 Windmoeller & Hoelscher Apparatus for stacking thermoplastic bags
US3721375A (en) * 1971-02-01 1973-03-20 Package Machinery Co Web feed mechanism for wrapping machines
US3730411A (en) * 1970-01-30 1973-05-01 Windmoeller & Hoelscher Severing apparatus for severing lengths of tube from a continuously fed flattened tubular web
US3807287A (en) * 1971-10-01 1974-04-30 Dow Chemical Co Take-away assembly
US4529114A (en) * 1983-09-09 1985-07-16 Moore Business Forms, Inc. Form burster
US5057181A (en) * 1989-02-22 1991-10-15 Windmoeller & Hoelscher Apparatus for applying reinforcing slips provided with a glue coating to a web having transverse perforation lines
US20020005101A1 (en) * 2000-05-11 2002-01-17 Wilhelm Lohrey System for the continuous separation of strings of material
US20170367546A1 (en) * 2014-12-18 2017-12-28 Better All Round Limited Method and Apparatus for Folding and Opening-Up Wipes

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4306475A (en) * 1978-02-15 1981-12-22 Gaf Corporation Trim cleaning apparatus
DE3241636A1 (de) * 1982-11-11 1984-05-17 Focke & Co, 2810 Verden Vorrichtung zum herstellen von verpackungszuschnitten
DE3437584A1 (de) * 1984-10-13 1986-04-17 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Bogenauslagevorrichtung an druckmaschinen
US5205217A (en) * 1990-12-31 1993-04-27 Howard W. DeMoore Vacuum transfer apparatus for rotary sheet-fed printing presses
DE102007018117B4 (de) * 2007-04-16 2010-09-09 Vits Technology Gmbh Querschneider für eine Papierbahn

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1105434B (de) * 1958-02-28 1961-04-27 Fritz Baessler Vorrichtung zum Abziehen vom Stapel, Glaetten und Ausrichten von Aufzeichnungstraegern
GB901906A (en) * 1958-12-15 1962-07-25 Linotype Machinery Ltd Improvements relating to sheet delivery for printing machines
US3116924A (en) * 1960-09-23 1964-01-07 William F Huck Sheet conveying device
DE1266210B (de) * 1961-12-13 1968-04-11 Molins Organisation Ltd Vorrichtung zum UEbertragen von Gegenstaenden, etwa Etiketten

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687447A (en) * 1970-01-16 1972-08-29 Windmoeller & Hoelscher Apparatus for stacking thermoplastic bags
US3730411A (en) * 1970-01-30 1973-05-01 Windmoeller & Hoelscher Severing apparatus for severing lengths of tube from a continuously fed flattened tubular web
US3721375A (en) * 1971-02-01 1973-03-20 Package Machinery Co Web feed mechanism for wrapping machines
US3807287A (en) * 1971-10-01 1974-04-30 Dow Chemical Co Take-away assembly
US4529114A (en) * 1983-09-09 1985-07-16 Moore Business Forms, Inc. Form burster
US5057181A (en) * 1989-02-22 1991-10-15 Windmoeller & Hoelscher Apparatus for applying reinforcing slips provided with a glue coating to a web having transverse perforation lines
US20020005101A1 (en) * 2000-05-11 2002-01-17 Wilhelm Lohrey System for the continuous separation of strings of material
US20170367546A1 (en) * 2014-12-18 2017-12-28 Better All Round Limited Method and Apparatus for Folding and Opening-Up Wipes
US10973375B2 (en) * 2014-12-18 2021-04-13 Better All Round Limited Method and apparatus for folding and opening-up wipes
US20210204763A1 (en) * 2014-12-18 2021-07-08 Better All Round Limited Method and Apparatus for Folding and Opening-Up Wipes
US11786084B2 (en) * 2014-12-18 2023-10-17 Better All Around Limited Method and apparatus for folding and opening-up wipes

Also Published As

Publication number Publication date
DE1611416B1 (de) 1972-03-16
GB1226617A (fr) 1971-03-31
FR1575295A (fr) 1969-07-18
NL6811061A (fr) 1969-02-05

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