US3740029A - Apparatus for removing sheets from stacks - Google Patents

Apparatus for removing sheets from stacks Download PDF

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Publication number
US3740029A
US3740029A US00245496A US3740029DA US3740029A US 3740029 A US3740029 A US 3740029A US 00245496 A US00245496 A US 00245496A US 3740029D A US3740029D A US 3740029DA US 3740029 A US3740029 A US 3740029A
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US
United States
Prior art keywords
movable frame
sheet
suction
suction grippers
frame
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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
US00245496A
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English (en)
Inventor
F Bays
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VIDOSA
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VIDOSA
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Publication date
Priority claimed from CH597171A external-priority patent/CH524526A/de
Application filed by VIDOSA filed Critical VIDOSA
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Publication of US3740029A publication Critical patent/US3740029A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G59/00—De-stacking of articles
    • B65G59/02—De-stacking from the top of the stack
    • B65G59/04—De-stacking from the top of the stack by suction or magnetic devices

Definitions

  • Apparatus for removing sheets from a stack of sheets includes a fixed frame and a movable frame mounted PP 245,496 to the fixed frame, the movable frame being at least vertically movable relative to the fixed frame from a [30] Foreign Application Priority Data lower position adjacent a stack of sheets to an upper 71 s l d 9 1 1 position.
  • suction gripi 2 3 3 pers mounted to the movable frame for engagement 2 9 wltzer an l with the top sheet of the stack, and a plurality of rotatable magnetic rollers mounted to the fixed frame for 2 engaging and supporting a sheet which is raised up by l the suction grippers and movable frame.
  • the present invention relates to apparatus for removing sheets from stacks, and more particularly for removing metal and metal foil sheets from stacks.
  • a known device of this type is designed to lift sheets individually from a stack and lay them onto two counter-rotating transport rollers which grip the lifted sheets and transmit or feed them, for example to a coiling machine.
  • the lifting of the top sheet from the stack is effected in these devices by means of suction grippers which are most often fastened to a frame, the frame being lowered so that the suction grippers engage the topmost sheet.
  • suction grippers which are most often fastened to a frame, the frame being lowered so that the suction grippers engage the topmost sheet.
  • a vacuum is created in the suction grippers, while simultaneously the frame moves upwards and then in the direction of the transport rollers, so that the sheet thus lifted by the suction grippers is then inserted between said rollers.
  • a disadvantage inherent in the known type of devices is that the suction grippers must release the sheets at the exact moment that the transport rollers engage the sheets. Consequently the free end of any given sheet, that is, the end which is opposite to that engaged between the rollers, drops down again, so that in the instant following engagement by the transport rollers, the greater part of the sheet is hanging from the transport rollers.
  • this circumstance is of no great importance; with larger, heavier sheets, however, this means a significant overload on the drive mechanism for the transport rollers because the transport rollers not only have to push the sheets forward, but also pull them up.
  • Such a two-phase lifting of the sheets, first by means of the suction grippers and then by means of the transport rollers is uneconomical. Further, undesirable noise is caused by the falling of each successive sheet as it is released by the suction grippers.
  • the suction grippers should lift the sheets far enough to bring them into contact with a series of magnetic devices.
  • the suction grippers can then immediately disengage, because the sheets will remain at tached to these magnetic devices.
  • the magnetic devices themselves must be driven, in order to insert the lifted sheets between the transport rollers.
  • the driving of several rows of magnetic elements is fairly expensive.
  • the system must be adjusted to the thickness of the sheets being processed, either to their maximum thickness or to an average thickness determined by most common use.
  • an object of the present invention is to avoid the expensive drive necessary to displace the magnetic devices, and to provide a simpler mechanism for removing sheets from a stack of sheets.
  • a further object of the present invention is to improve the utilization of the time in which the sheet is displaced for a downwards and also partially upwards motion of the suction grippers, so that immediately after displacement of the sheets it is possible to bring another sheet to the magnetic devices, thereby increasing operating efficiency.
  • apparatus for removing sheets from a stack. of sheets includes a fixed frame, a movable frame mounted to the fixed frame and being at least vertically movable relative to the fixed frame from a lower position which is adjacent to a stack of sheets, to an upper position, and a plurality of suction grippers mounted to the movable frame for engaging the top sheet of the stack when the movable frame is in a lower position. Further included is a plurality of rotatable magnetic rollers mounted to the fixed frame for engaging and supporting a sheet when the movable frame is in its upper position with a sheet carried by the suction grippers.
  • a movable carrier member is further provided for removing the sheet supported by the magnetic rollers for engagement with the magnetic rollers.
  • the suction grippers are moved relative to the movable frame to clear the sheet supported by the magnetic rollers so that the movable frame can be lowered passed the supported sheet without interfering therewith to engage a further sheet from the stack during removal of the supported sheet.
  • the magnetic rollers are adjustably mounted to accommodate various sizes of sheets.
  • the suction grippers are preferably suspended from movable longitudinal members which are movably supported in the fixed frame. This enables the position of the suction grippers to be adjusted relative to the sheets to enable the apparatus to be favorably used with various sizes of sheets.
  • FIG. 1 illustrates a first embodiment of the apparatus of the present invention in side view
  • FIG. 2 illustrates a section along line II-II of FIG. 1;
  • FIG. 3 illustrates a partial section through the apparatus along line III-III in FIG. 2;
  • FIG. 4 illustrates a section atthe same place as in FIG. 3, but for a different embodiment of the present invention.
  • FIG. 5 illustrates a cross-section of a suction gripper.
  • FIGS. 1-3 the rigid frame of the apparatus is generally indicatedby 1.
  • Two laterally displaceable longitudinal members 101 are mounted to the frame 1 in a known and therefore not further described fashion. Members 101 are displaceable as indicated by the arrows A and B in FIG. 2.
  • a vertically movable frame 2 is mounted to the two longitudinal displaceablemembers 101.
  • Frame 2 includes two longi tudinal beams 24, which are connected together by at least one cross member 25. Two such cross members 25 are shown in FIG. 1. Longitudinal beams 24 are located directly beneath longitudinal members 101 of frame 1.
  • a main piston-cylinder assembly .3 is coupled to each longitudinal member 101, the piston rod 31 of which slideably passes through each respective longitudinal member 101.
  • the end of each piston rod 31 is connected to about the midpoint of a respective longitudinal beam 24.
  • Each longitudinal beam 24 of movable frame 2 further has two guide rods 4 extending vertically near the ends of beams 24, the guide rods slideably passing through the respective longitudinal member 101.
  • Magnetic rollers 11 are loosely journalled on respective axles 10. Axles are secured to hangers 110, which for example are displaceably mounted to cross rods 111 between the two longitudinal members 101. In addition, magnetic rollers 11 can also be displaceable to a limited extent on axle journals 10. The cross rods 111 are also displaceable relative to their own longitudinal axes. With this arrangement, magnetic rollers 11 may be adjusted to properly engage the sheet surface about to be processed, in both the longitudinal and crosswise directions relative to the sheet lifting apparatus.
  • a movable carrier 18 which pushes the lifted sheet against a pair of transport rollers 19 (FIG. 1).
  • Carrier 18 is mounted to a cross member 181, which by means of pushing guides 182 is located movably against guide rods 183 (FIG. 1).
  • Guide rods 183 are arranged underneath longitudinal members 101.
  • the drive of carrier 18 is effected by means of a piston cylinder assembly 22 and by means of cable 184 which is looped around guide roller 185.
  • actuation parts 50 preferably pneumatic cylinder-piston assemblies
  • Their piston rods 51 pass through the longitudinal beams 24 and on the end of each piston rod 51 is mounted a single suction gripper 7.
  • Cylinder-piston assemblies 50 are connected, over flexible pipes (not shown in the drawings) to a compressed air source as well as to acontrol device which governs the direction of movement of piston rods 51 as well as the turning-on of these movements. For .smaller devices which need to lift only lighter sheets, every suction gripper 7 can be directly secured to its respective piston rods 51.
  • the device operates as follows:
  • the two main cylinder piston systems 3 together move frame 2 downwards, and at the same time suction grippers 7 are moved toward the middle of the apparatus.
  • the extent of the movement of suction grippers 7 is determined by the width of the sheets 14 to be lifted.
  • Frame 2 moves downward until the suction grippers reach the topmost sheet 14 of a stack of sheets 12, which stack 12 lies on a table 13 or on a palette in the middle of the apparatus.
  • Suction grippers 7 suck up sheet 14, and frame 2 then moves back upward until sheet 14 touches against magnetic rollers 11, as shown by the dashed line representation of sheet 14 in FIG. 2.
  • a limit switch 53 is ac- .tuated (FIG. 2) which may be set at any appropriate place and which generates a signal for the cutting off of the suction action of suction grippers 7.
  • Suction grippers 7 are thereby disengaged from the sheet 14 on which frame 2 stays.
  • Now carrier 18 is caused to grasp the sheet 14 by the front end thereof and pushes it in the direction of a processing machine which is symbolically represented in the drawing by a pair of transport rollers 19 (FIG. 1).
  • Transport rollers 19 grasp the sheet between them and pull it completely away from magnetic rollers 11.
  • Suction grippers 7 While sheet 14 is being pushed away by carrier 18, cylinder-piston assemblies 50 are actuated such that they draw suction grippers 7 (which are now in the position shown in the drawing) against longitudinal beams 24 to clear the lifted sheet 14, immediately after which the return movement of the frame 2 begins. Suction grippers 7 thus move in a path as indicated by arrows 54 (FIG. 2), thereby enabling suction grippers 7 to approach stack 12 so as to lift up a new sheet while the preceding sheet 14 is still hanging on magnetic rollers 11 or is being displaced from said magnetic rollers 11 by carrier 18. Suction grippers 7 can also immediately pick up the next sheet and lift it until it is immediately beneath the preceding sheet.
  • suction grippers 7 can continue their upward motion until the new sheet engages and hangs on magnetic rollers 11. In this way it is possible to pick up one sheet after the other with a minimum delay in feeding into adjacent processing machinery and thereby to achieve a maximum hourly output.
  • FIG. 4 operates in the same manner as the above-described embodiment.
  • the chief difference relative to the previously described embodiment is that the individual suction grippers of one side are set on carriers 6.
  • Each carrier 6 is connected with the adjacent longitudinal beam 24 of movable frame 2 by means of several pivotally connected levers 62.
  • each carrier 6 For the displacement of each carrier 6 relative to its respective longitudinal beam 24, a single cylinderpiston assembly 50 generally suffices.
  • the advantage of this embodiment lies in that it is easier to effect displacement of the suction grippers 7 along carrier 6 so as to adjust to the sheet width to be processed. This is accomplished, for example, by displaceably mounting each suction gripper 7 in an elongated slot 61 in carrier 6.
  • each individual cylinder-piston assembly 50 including piston rod 51 and guide rod 52 must be mounted as a laterally displaceable unit in longitudinal beam 24, the direction of desired lateral displacement being indicated by arrows C and D in FIG. 3. This type of adjustable arrangement in FIG. 3 would be mechanically undesirable.
  • suction cup 71 is pressed flat, so that the air is forced out of its interior. When lifted it assumes its original shape again, thus also exhibiting its original volume. But since in the meantime the air was pressed out, a partial vacuum is created interior of suction cup 71 which is sufficient even for relatively heavy sheets (given a sufficient number of suction grippers).
  • Suction cup 71 is attached to a hollow piston 72.
  • the hollow piston 72 is laterally displaceably mounted in member 73 of the suction gripper, piston 72 having an opening 74 therein which is closed when the sheet is lifted.
  • Piston 72 is actuated by means of an electromagnet 75, which at the moment limit switch 53 is actuated by the contact of magnetic rollers 11 with sheet 14, is excited and draws up piston 72 so that opening 74 is at least partially drawn out of housing 73.
  • opening 74 is drawn out of housing 73 air can enter the inside of suction cup 71, which leads to the immediate release of the sheet 14 by suction gripper 7.
  • Apparatus for removing sheets from a stack of sheets comprising:
  • a movable frame 2 mounted to said fixed frame (1) and being at least vertically movable relative to said fixed frame 1) from a lower position adjacent a stack of sheets (12) to an upper position;
  • a plurality of suction grippers (7) mounted to said movable frame (2). for engagement with the top sheet (14) of said stack (12);
  • a plurality of rotatable magnetic rollers (11) mounted to said fixed frame (1) for engaging and supporting a sheet (14) when said movable frame (2) is in its upper position with a sheet (14) carried by said suction grippers (7);
  • a movable carrier member for removing said sheet (14) supported by said magnetic rollers (11 and means (50-52) for displacing said suction grippers (7) relative to said movable frame (2) to clear the sheet (14) supported by said magnetic rollers (11), so that said movable frame (2) can be lowered past said supported sheet (14) to engage a further sheet from said stack (12).
  • said fixed frame includes at least one longitudinal member (101) horizontally displaceable relative to said fixed frame 1), and wherein said movable frame (2) is movably coupled to said at least one horizontally displaceable longitudinal member (101).
  • Apparatus according to claim 5 including a pistoncylinder assembly (3) movably coupling said movable frame (2) to said at least one horizontally displaceable longitudinal member (101), said movable frame being vertically movable relative to said horizontally displaceable longitudinal member.
  • Apparatus according to claim 5 including vertically extending guide rods (4) slideably coupling said movable frame to said horizontally displaceable longitudinal member (101).
  • said means (50-52) for displacing said suction grippers includes at least one cylinder-piston assembly coupling said suction grippers to said movable frame.
  • each suction gripper is mounted to said movable frame by means of respective displaceable members (52).
  • said separate displaceable members for mounting said suction grippers to said movable frame each include a slideably mounted guide rod (52) connected at one end to a suction gripper and being slideably mounted to said movable frame, and means for displacing said guide rod relative to said movable frame to thereby dis place said suction gripper.
  • Apparatus according to claim 1 including a holding member 6) carrying a plurality of suction grippers, and being displaceably mounted relative to said movable frame (2), said means for displacing including means for displacing said holding member (6) relative to said movable frame.
  • each holding member is coupled to said movable frame by a plurality of pivotally connected lever members (22).
  • Apparatus according to claim 1 wherein said means for displacing said suction grippers is mounted on the outer side of said movable frame.
  • each suction gripper is displaceably mounted on its respective holding member in a longitudinal slot in the holding member.
  • Apparatus according to claim 17 including two longitudinal members (101) and wherein said hangers (110) are displaceably mounted on cross-rods (111) which are mounted between said two longitudinal members.
  • each of said suction grippers (7) includes a suction cup (71); a piston (72) in air communication with said suction cup (71), said piston (72) having an air relief opening (74) therein; a slideable member (73) slideably mounted over said piston (72) and adapted to selectively open and close said air relief opening (74); and means (75) for selectively sliding said slideable member (73) over said piston (72) for selectively opening and closing said air relief opening (74).
  • Apparatus according to claim 19 wherein said means for moving said movable member includes an electrical solenoid (75).

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  • Sheets, Magazines, And Separation Thereof (AREA)
US00245496A 1971-04-23 1972-04-19 Apparatus for removing sheets from stacks Expired - Lifetime US3740029A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH597171A CH524526A (de) 1971-04-23 1971-04-23 Vorrichtung zum Entstapeln von Blechfolien und/oder Blechtafeln
CH427772A CH536770A (de) 1971-04-23 1972-03-22 Vorrichtung zum Entstapeln von Blechfolien und/oder Blechtafeln

Publications (1)

Publication Number Publication Date
US3740029A true US3740029A (en) 1973-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00245496A Expired - Lifetime US3740029A (en) 1971-04-23 1972-04-19 Apparatus for removing sheets from stacks

Country Status (6)

Country Link
US (1) US3740029A (cs)
CH (1) CH536770A (cs)
DE (1) DE2218682B2 (cs)
FR (1) FR2134007B1 (cs)
GB (1) GB1360931A (cs)
IT (1) IT953739B (cs)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804173A (en) * 1985-06-03 1989-02-14 Roberts Corporation Method and apparatus for moving individual sheets from a stack of sheets
US4950128A (en) * 1987-11-09 1990-08-21 Telmec S.P.A. Automatic loading unit for sheet units onto machines equipped with a conveyor
US5087025A (en) * 1988-03-18 1992-02-11 Fuji Photo Film Co., Ltd. Sheet delivery mechanism having a suction feeder including a movable roller pair
US5848785A (en) * 1995-08-10 1998-12-15 Lomir Engineering Limited Sheet material feeding and unloading apparatus
WO2004083087A1 (en) * 2003-03-19 2004-09-30 Kun Shan Bao Yu Plastic Casing Co., Ltd. Sheet feeding mechanism
US20070033778A1 (en) * 2002-12-30 2007-02-15 Sara Lee Corporation Handling Method and Device for Simultaneous Processing of Textile Pieces
CN110027904A (zh) * 2019-04-12 2019-07-19 佛山市汇创科技有限公司 一种锂电芯卷绕机的上料系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260310A (en) * 1979-07-11 1981-04-07 American Can Company Strip feed elevator
CH694504A5 (de) * 1999-02-19 2005-02-28 Elpatronic Ag Verfahren zum Schneiden von Blechtafeln zu Blechstreifen sowie Schneidevorrichtung zu dessen Durchfuehrung.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936171A (en) * 1960-05-10 Sheet feeding apparatus
US3512660A (en) * 1968-10-15 1970-05-19 Budd Co Ferromagnetic metal sheet destacker and feeder
US3584866A (en) * 1968-05-27 1971-06-15 Ropak Mfg Co Magnetic conveyor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936171A (en) * 1960-05-10 Sheet feeding apparatus
US3584866A (en) * 1968-05-27 1971-06-15 Ropak Mfg Co Magnetic conveyor
US3512660A (en) * 1968-10-15 1970-05-19 Budd Co Ferromagnetic metal sheet destacker and feeder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804173A (en) * 1985-06-03 1989-02-14 Roberts Corporation Method and apparatus for moving individual sheets from a stack of sheets
US4950128A (en) * 1987-11-09 1990-08-21 Telmec S.P.A. Automatic loading unit for sheet units onto machines equipped with a conveyor
US5087025A (en) * 1988-03-18 1992-02-11 Fuji Photo Film Co., Ltd. Sheet delivery mechanism having a suction feeder including a movable roller pair
US5848785A (en) * 1995-08-10 1998-12-15 Lomir Engineering Limited Sheet material feeding and unloading apparatus
US20070033778A1 (en) * 2002-12-30 2007-02-15 Sara Lee Corporation Handling Method and Device for Simultaneous Processing of Textile Pieces
US8060998B2 (en) * 2002-12-30 2011-11-22 Hbi Branded Apparel Enterprises, Llc Handling method and device for simultaneous processing of textile pieces
WO2004083087A1 (en) * 2003-03-19 2004-09-30 Kun Shan Bao Yu Plastic Casing Co., Ltd. Sheet feeding mechanism
CN100360387C (zh) * 2003-03-19 2008-01-09 昆山宝裕吸塑厂 片材送料机构
CN110027904A (zh) * 2019-04-12 2019-07-19 佛山市汇创科技有限公司 一种锂电芯卷绕机的上料系统
CN110027904B (zh) * 2019-04-12 2024-05-28 佛山市汇创科技有限公司 一种锂电芯卷绕机的上料系统

Also Published As

Publication number Publication date
DE2218682B2 (de) 1973-08-30
FR2134007A1 (cs) 1972-12-01
GB1360931A (en) 1974-07-24
CH536770A (de) 1973-05-15
FR2134007B1 (cs) 1977-01-14
DE2218682C3 (cs) 1974-04-18
DE2218682A1 (de) 1972-11-09
IT953739B (it) 1973-08-10

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