EP0939047A1 - Verfahren und Vorrichtung zum Vereinzeln von Metallplatten - Google Patents

Verfahren und Vorrichtung zum Vereinzeln von Metallplatten Download PDF

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Publication number
EP0939047A1
EP0939047A1 EP99400402A EP99400402A EP0939047A1 EP 0939047 A1 EP0939047 A1 EP 0939047A1 EP 99400402 A EP99400402 A EP 99400402A EP 99400402 A EP99400402 A EP 99400402A EP 0939047 A1 EP0939047 A1 EP 0939047A1
Authority
EP
European Patent Office
Prior art keywords
sheets
stack
upper sheet
sheet
corner
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Withdrawn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
EP99400402A
Other languages
English (en)
French (fr)
Inventor
Georges Barakat
Bernard Criqui
Cyril Malarge
Brayima Dakyo
Jean-Philippe Joubert
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP0939047A1 publication Critical patent/EP0939047A1/de
Withdrawn legal-status Critical Current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
    • B65H3/00—Separating articles from piles
    • B65H3/16—Separating articles from piles using magnetic force

Definitions

  • the present invention relates to a method and a device for unstacking of sheets.
  • stamping lines In particular for production of motor vehicle bodies, the sheets arrive in packages and are then unstacked and conveyed one after the other to the stamping presses.
  • the first process consists of inserting a threaded rod between the upper sheet to be removed and the rest of the stack of sheets and the second method is to inject pressurized air between the two first sheets of the stack of sheets by the use of flat spouts placed at the edge of the stack of sheets.
  • the oil film which covers the sheets can be broken and the sheet can be separated and removed for example thanks to suction cups.
  • the friction of the threaded rod on the sheets removes material and spreads chips on their faces, thus degrading the condition of the sheets for subsequent operations by example of painting.
  • the transverse movement mechanism of the threaded rod at the edge of the sheet pile must have elements complex and bulky mechanical due to variations in straightness stacks of sheets.
  • the object of the present invention is to try to remedy the above disadvantages of the solutions currently used.
  • the present invention firstly relates to a method of unstacking of sheets placed one above the other and forming a battery, which consists in generating a magnetic field in a part adjacent to the edges of the top sheet of the stack of sheets, so to generate field lines especially in the plane of the sheet top of the stack of sheets, to circulate an electric current in the upper sheet of the stack of sheets substantially perpendicular to said field lines, so as to cause a raising of the edge of the upper sheet of the stack of sheets.
  • the method according to the invention consists, in addition, in lifting the sheet upper part of the sheet pile and remove it.
  • the process according to the invention preferably consists, after the abovementioned resulting bearing from the edge of the upper sheet of the pile of sheets, to keep raised and / or lift the part adjacent to this edge of this upper sheet then lift the central part of the sheet to purposes of its removal.
  • the method according to the invention preferably consists in generating the aforementioned magnetic field in a corner part of the stack of sheets so as to produce field lines in arcs extending between the edges determining said corner of the upper sheet of the stack of sheets.
  • the method according to the invention preferably consists in making circulate an electric current in the upper sheet of the stack of sheets along and in the area of the edges of this upper sheet determining said corner.
  • the present invention also relates to a device for unstacking of sheets placed one above the other and forming a pile, in particular for the implementation of the above method, which of preference includes two permanent magnets arranged along the edges delimiting a corner of the stack of sheets, in the upper part of this battery, a magnetic flux return circuit joining by outside said permanent magnets, and retractable means carrying at least two electrodes bearing at a distance one of the other on the upper sheet of the stack of sheets and likely to be connected to a source of electric current, the magnetizations of said permanent magnets being perpendicular to said edges of the stack of sheets, their own likings being perpendicular.
  • said electrodes preferably come resting on the upper sheet of the stack of sheets under the effect of springs.
  • said retractable means comprise at least one retractable arm carrying at least one electrode located in the area of said corner of the upper sheet of the stack of sheets and at at least one electrode located at a distance from said corner electrode and in the vicinity of one of said edges of the upper sheet.
  • said retractable means comprise preferably a lifting suction cup arranged in the area of the corner of the upper sheet of the stack of sheets.
  • the unstacking device comprises, in complement, means for taking the upper sheet from the pile of sheets and remove it, which include at least one suction cup placed in the central part of this upper sheet.
  • the unstacking device shown in the figures which is generally identified by the reference 1, is intended to constitute an aid for unstacking the upper sheet 2 of a stack of sheets 3 of rectangular shape, arranged on an air cushion not shown.
  • the device 1 is placed in a corner of the stack of sheets 2 and includes two permanent magnets 4 and 5 which extend horizontally along two adjacent sides of the stack of sheets 3, determining a corner 6, in the vicinity of this corner, and which exceeds slightly above it, so that the adjacent edges 7 and 8 of the upper sheet 2 extend laterally to magnets 4 and 5.
  • Permanent magnets 4 and 5 are integral with a circuit magnetic flow return 9 which is set square outside permanent magnets 4 and 5.
  • the magnetizations of permanent magnets 4 and 5 are perpendicular to the edges 7 and 8 of the sheet 2 and the magnetization of the magnet 4 is obtained by a rotation of 90 ° with respect to that of magnet 5 counterclockwise.
  • the device 1 further comprises a retractable support 11 which is carried by an operating arm 12 so that it can be arranged above and at a distance from the corner 6 of the stack of sheets 3.
  • the support 11 carries two vertical electrodes 13 and 14 which cross and which are subjected downwards to the effect of springs 15 and 16 to come to rest on the upper sheet 2, as well as a suction cup 17 which is connected to an external vacuum circuit 18.
  • Electrodes 13 and 14 are electrically connected by a horizontal connection bar 19 on which is connected an electrical connection braid 20.
  • the retractable support 11 carries two arms 21 and 22 which extend respectively parallel to the edges 7 and 8 of the sheet 2, in direction of its other corners opposite corner 6.
  • the ends of the horizontal arms 21 and 22 carry vertical electrodes 23 and 24 which extend downwards so that that their lower ends come to rest on the upper sheet 2 of the stack of sheets 3, near its edges 7 and 8 and at a distance from the electrodes 13 and 14. On electrodes 23 and 24 are also connected electrical braids 25 and 26.
  • the electrical braid 20 connected to the electrodes of corner 13 and 14 and on the other hand the electrical braids 25 and 26 connected to the edge electrodes 23 and 24 are respectively connected to the two poles 27 and 28 of a current source 29 shown in FIG. 6.
  • This current source 29 includes a transformer 30 which is powered by an alternating current source 31 and which is connected to a rectifier circuit 32 via an inductor 33, the output rectifier circuit 32 being connected to poles 27 and 28.
  • a diode bridge 34 is also connected to poles 27 and 28, this bridge making the current source 29 insensitive to short circuits which may occur at the contact points of the electrodes above with the upper plate 2.
  • a device for taking and removal 35 can be arranged in the upper central part of the stack of sheets 3 and carries four suction cups 36.
  • the device 1 which has just been described can be used from the next way.
  • the retractable support 11 is brought into the position described previously, so that the lower ends of the electrodes 13 and 14 and the suction cup are in contact with the face upper of the upper sheet 2 of the stack of sheets 3, in the corner 6 of the latter, and that the lower ends of the electrodes 23 and 24 are also in contact with the upper face of the upper sheet 2, away from corner 6.
  • the springs 15 and 16 and the suction cup 17 are constructed of so as to exert bearing forces on the upper face of the sheet upper 2 which are as low as possible.
  • the current source 29 is switched on. N is established then a passage of electric current mainly in the sheet upper 2 between the corner electrodes 13 and 14 and the electrodes of edge 23 and 24.
  • the current lines thus established extend substantially perpendicular to the magnetic field lines 10 produced by permanent magnets 4 and 5.
  • the vacuum circuit 18 is established.
  • the suction cup 17 produces then its effect and certainly raises the corner 6 of the sheet 2.
  • the vacuum circuit is established suction cups 36 of the removal device 35 to cause the total lifting of the upper plate 2 with respect to the rest of the pile of sheets 3.
  • the device 1 is insensitive variations in the straightness of the top sheet 2 to be removed from the stack of sheets 3, that it tolerates variations in vertical positioning of the stack of sheets 3, that it exerts no effort liable to deteriorate the sheets of the stack of sheets 3 and that, because of its simplicity, can be easily integrated into a production line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP99400402A 1998-02-27 1999-02-19 Verfahren und Vorrichtung zum Vereinzeln von Metallplatten Withdrawn EP0939047A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9802418 1998-02-27
FR9802418A FR2775473B1 (fr) 1998-02-27 1998-02-27 Procede et dispositif de depilage de toles

Publications (1)

Publication Number Publication Date
EP0939047A1 true EP0939047A1 (de) 1999-09-01

Family

ID=9523465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99400402A Withdrawn EP0939047A1 (de) 1998-02-27 1999-02-19 Verfahren und Vorrichtung zum Vereinzeln von Metallplatten

Country Status (2)

Country Link
EP (1) EP0939047A1 (de)
FR (1) FR2775473B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008100A1 (es) * 1999-04-26 2002-01-31 Asm, S.A. Dispositivo para separación, levantamiento y traslado de chapas de aluminio u otro material no ferromagnético
GB2462499A (en) * 2008-08-15 2010-02-17 Cocatalyst Ltd Improvements to non-ferrous sheet transport systems
DE102016123492B4 (de) 2015-12-04 2020-06-18 GM Global Technology Operations LLC Abstapelvorrichtung für das automatisierte handhaben von eisenfreien metallobjekten
DE102016123360B4 (de) 2015-12-04 2020-06-25 Gm Global Technology Operations, Llc Magnetodynamische vorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19961648A1 (de) * 1999-12-21 2001-07-05 Nsm Magnettech Gmbh & Co Kg Verfahren und Einrichtung zum Entstapeln von Teilen aus elektrisch leitendem Werkstoff

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04317935A (ja) * 1991-04-15 1992-11-09 Ishikawajima Harima Heavy Ind Co Ltd 非磁性金属板の取出装置
DE29502103U1 (de) * 1995-02-09 1995-03-23 NSM Magnettechnik GmbH, 59399 Olfen Vorrichtung zur Einzelentnahme von Blechen o.dgl. von einem Stapel
US5439207A (en) * 1993-02-23 1995-08-08 Hermann Schleicher Gmbh & Co. Conveyor system for metallic plates and strips

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04317935A (ja) * 1991-04-15 1992-11-09 Ishikawajima Harima Heavy Ind Co Ltd 非磁性金属板の取出装置
US5439207A (en) * 1993-02-23 1995-08-08 Hermann Schleicher Gmbh & Co. Conveyor system for metallic plates and strips
DE29502103U1 (de) * 1995-02-09 1995-03-23 NSM Magnettechnik GmbH, 59399 Olfen Vorrichtung zur Einzelentnahme von Blechen o.dgl. von einem Stapel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 144 (M - 1386) 23 March 1993 (1993-03-23) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008100A1 (es) * 1999-04-26 2002-01-31 Asm, S.A. Dispositivo para separación, levantamiento y traslado de chapas de aluminio u otro material no ferromagnético
US6746063B1 (en) 1999-04-26 2004-06-08 Albert Redo Sanchez Device for separating, lifting and moving aluminium sheets or other non-ferromagnetic material
GB2462499A (en) * 2008-08-15 2010-02-17 Cocatalyst Ltd Improvements to non-ferrous sheet transport systems
DE102016123492B4 (de) 2015-12-04 2020-06-18 GM Global Technology Operations LLC Abstapelvorrichtung für das automatisierte handhaben von eisenfreien metallobjekten
DE102016123360B4 (de) 2015-12-04 2020-06-25 Gm Global Technology Operations, Llc Magnetodynamische vorrichtung

Also Published As

Publication number Publication date
FR2775473B1 (fr) 2000-04-07
FR2775473A1 (fr) 1999-09-03

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