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US3353822A - Transport device for blanks, especially for machine tools - Google Patents

Transport device for blanks, especially for machine tools Download PDF

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Publication number
US3353822A
US3353822A US515546A US51554665A US3353822A US 3353822 A US3353822 A US 3353822A US 515546 A US515546 A US 515546A US 51554665 A US51554665 A US 51554665A US 3353822 A US3353822 A US 3353822A
Authority
US
United States
Prior art keywords
blanks
poles
blank
plane
stack
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
US515546A
Other languages
English (en)
Inventor
Dangelmaier Karl
Griesinger Karl
Kurz Otto
Schneider Franz
Scholl Herbert
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.)
L Schuler GmbH
Original Assignee
L Schuler GmbH
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 L Schuler GmbH filed Critical L Schuler GmbH
Application granted granted Critical
Publication of US3353822A publication Critical patent/US3353822A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/20—Storage arrangements; Piling or unpiling
    • B21D43/24—Devices for removing sheets from a stack
    • 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
    • B65G54/00—Non-mechanical conveyors not otherwise provided for
    • B65G54/02—Non-mechanical conveyors not otherwise provided for electrostatic, electric, or magnetic

Definitions

  • This invention relates to a device for transporting blanks of ferromagnetic material vertically of their plane along a path. More specifically this invention relates to a device for feeding blanks from the top of a stack to a machine tool, the stack being provided with magnets.
  • the magnets are arranged only at the upper end of the stack and serve for spreading the blanks, i.e. they are intended to prevent two blanks from sticking together at their edges due to the presence of burr thereon and being taken together from the stack and fed to the machine tool.
  • the spreading effect is due to the fact that two ferromagnetic bodies in a magnetic field will repel each other.
  • the spreading magnets were so designed as to form a field as homogeneous as possible in the end region of the stack.
  • the invention consists in that pairs of poles of magnets are arranged along the transport path of the blanks in planes extending vertically of the transport direction and at least one pair of poles is adapted to be switched on and off for the purpose of shifting' planes having a concentration of magnetic flux lines.
  • a particular advantage of the device designed as proposed by the invention resides in that it permits blanks to be lifted from the top of a stack and to be moved individually into a plane from where they can be fed into the machine tool with the aid of a gripping or like device.
  • a special device for lifting the stack is required which always lifts the stack to a height in which the uppermost blank of the stack is in the plane for being taken over by the gripping device.
  • This special lifting device is avoided in the arrangement proposed by the inventionp
  • the transport device according to the invention also ensures that always only one single blank will be moved into the plane where it is taken over by the gripping device. It is very difiicult to achieve this with mechanical transport devices bridging the ever increasing distance between the upper end of the stack and the plane in which the blank is received by the gripping device.
  • the pairs of poles are adapted to be switched on and off independently of each other.
  • This embodiment permits the individual blanks to be moved especially rapidly.
  • the pairs of poles may be provided in staggered arrangement along the transport path, e.g. they may be relatively displaced in helical, rectangular or other lines.
  • the two pole faces of a magnet may be arranged adjacent each other and extend at an angle relative to each other in one embodiment of the invention.
  • these two pole faces according to a further development of this embodiment, have the form of polygonal courses, it is possible to use always the same pole faces irrespective of the diameter of the transported blanks.
  • At least the poles of the pair arranged at the end of the transport path have a sharp edge defining in a manner known per se the plane of greatest concentration of magnetic flux lines. This is the plane in which the blanks are taken over by a following transport means. Each blank has a permanent tendency of entering into the plane between poles where in the absence of blanks the greatest density of magnetic flux lines occurs.
  • the individual pole pairs arranged along the transport path may be connected with each other by a thin ferromagnetic metal sheet.
  • the bolt When processing blanks having a recess in which a bolt engages at least over a partial section of the transport path, also the bolt may have magnetic poles according to a further embodiment of the invention.
  • FIG. 1 is a schematic section through an embodiment of the transport device according to the invention with magnets switched off;
  • FIG. 2 is a similar view of the same arrangement with magnets switched on;
  • FIG. 3 is a lateral View showing an embodiment of the pole faces of a magnet.
  • FIG. 4 is a similar view of another embodiment of the pole faces of a magnet.
  • poles 10 and 11 of a solenoid or a strong controllable permanent magnet are arranged on either side of a transport channel 1 which may be closed at its lower end by a ferromagnetic plate 2, the poles 10 and 11 being disposed at the end adjacent this plate 2.
  • a pair of poles 6 and 7 of another magnet is provided at a distance 5 the length of which is dependent on the power of the magnets used and produces an inhomogeneous field of force heavily concentrated in the plane schematically indicated by the points.
  • FIG. 1 the magnets are switched off.
  • a stack 8 of individual blanks 9 rests on the plate 2 adjacent the magnetic poles 10 and 11 which are so designed as to produce a magnetic field substantially homogeneous in the range of the transport path along which they are arranged.
  • FIG. 2 shows the position of the blanks when the magnets are switched on.
  • the magnet with the poles 10 and 11 works as a spreading magnet.
  • the blanks 9 exert repulsive forces on each other and are driven apart.
  • the uppermost blank 9' moves into the range of the highly inhomogeneous magnetic field produced by the magnetic poles 6 and 7 and is pulled thereby into the plane of greatest concentration of magnetic fiux lines.
  • the second blank 9" can however not follow this movement as long as it is still under the repulsive force of the blank 9'.
  • the blank 9' is initially retained in the plane defined by the points of the pole shoes 6 and 7.
  • a transport means for example a gripping device, grips the blank located there and feeds it into a machine tool, for example a press.
  • the device proposed by the invention includes means for shifting at least one plane of greatest magnetic flux density in the direction of movement of the blanks without mechanical intervention.
  • the travelling magnetic field thus assumes the function of a lifting device which carries the blanks individually into their final position between the poles 18 and 19.
  • at least one pair of poles is arranged to be switched on and off.
  • This switching on and oif can be achieved by cutting in and out the exciting windings of the solenoids or by short-circuiting the magnetic flux of the magnets.
  • the magnet with the pole shoes 14 and 15, i.e. the one adjacent to the magnet with the pole shoes 6 and 7, is switched on, there is again an inhomogeneous magnetic field between the pole shoes 14 and 15.
  • This field exerts an attractive force on the blank located between the pole shoes 6 and 7 since there is as yet no blank between the pole shoes 14 and 15.
  • the magnet located adjacent the stack is designed as a spreading magnet with a magnetic field as homogeneous as possible.
  • the pole shoes of this magnet may be so designed that its field is also inhomogeneous and has its greatest magnetic flux density in a plane that may, for example, be located near the upper edge of the stack. It is only necessary to ensure that there are always at least two blanks in the range of this magnetic field that exert repulsive forces on each other so that the uppermost blank will be urged upwardly out of the range of greatest magnetic flux density and this blank can jump into the field between the following pole 4 shoes 6 and 7 when no blank is present in the range of this field.
  • the device proposed by the invention may be so designed that the stack of blanks 8 can be introduced from above, from the side or from the bottom after removing the plate 2.
  • the poles are shown as being located in the drawing plane. It is, of course, possible, in various embodiments of the invention, to displace the pairs of poles around the axis of the direction of transportation. This is especially advisable when the optimum distance between the planes of greatest magnetic flux density is so small that the exciting windings of the electromagnets cannot be accommodated if all the magnets are arranged in alignment one above the other.
  • the magnets may be arranged, for example, in crosswise or helical displacement relative to each other around the transport path.
  • Such a channel wall may also include magnetically conductive metal sheets 26 and 27 interconnecting the individual poles arranged one behind the other in the direction of transportation. This arrangement will give the path sections between the individual pairs of poles a somewhat greater field strength.
  • Blanks having a central recess are generally guided by a bolt engaging in a recess of the blank.
  • this bolt is provided with magnetic poles arranged in the plane of the other magnetic poles at the edge of the blank. If it is a case of large blanks, so that the distance between the individual poles engaging the edge of the blank is relatively great, this arrangement proposed by the invention of providing pairs of poles also on the bolt substantially increases the forces helping to move the blanks and thereby also the disadvantage is avoided that large blanks will sag in the center when the magnets only act upon their edges.
  • the invention is not restricted to the provision of only one pair of poles in each plane. Rather, any desired number of pole pairs may be arranged in any one plane.
  • the pole faces 20 and 21 of a magnet may be designed, as shown in FIGS. 3 and 4, so as to extend at an angle relative to each other.
  • the magnet has a yoke 22 carrying the exciting winding 23.
  • This form is especially suitable for circular blanks.
  • the pole faces 24 and 25 have the form of polygonal courses. This form is especially suitable where it is desired that the diameter of the transport channel should be adapted to be varied in accordance with the varying diameters of the transported blanks.
  • the magnets may also be arranged in the device for adjustment radially of the axis of the transport channel.
  • a device for transporting individual blanks of ferromagnetic material vertically of their plane along a path especially a device for feeding blanks from the top of a stack to a machine tool, the stack being provided with spreading magnets, characterized in that pairs of poles are arranged along the transport path of the blanks in planes extending vertically of the transport direction and at least one pair of poles is adapted to be switched on and off for the purpose of shifting planes having a concentration of magnetic flux lines.
  • a device as claimed in claim 1 characterized in that the individual pairs of poles arranged along the transport path and having the same polarity are interconnected by a thin ferromagnetic metal sheet.
  • a device as claimed in claim 1 characterized in that at least the poles of the pair arranged at the end of the transport path are provided with a sharp edge defining in a manner known per se the plane of greatest concentration of magnetic flux lines in which the blank is taken over by the next following transport means.
  • a device as claimed in claim 1 characterized in that the pairs of poles are displaced relative to each other along the transport path.
  • a device as claimed in claim 1 characterized in that a plurality of pole pairs are arranged in one plane, the two pole faces of each magnet being arranged adjacent each other and extending at an angle relative to each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US515546A 1965-01-05 1965-12-22 Transport device for blanks, especially for machine tools Expired - Lifetime US3353822A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH36336A DE1266687B (de) 1965-01-05 1965-01-05 Transportvorrichtung fuer Platinen aus ferromagnetischem Werkstoff, insbesondere bei Werkzeugmaschinen

Publications (1)

Publication Number Publication Date
US3353822A true US3353822A (en) 1967-11-21

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ID=7433829

Family Applications (1)

Application Number Title Priority Date Filing Date
US515546A Expired - Lifetime US3353822A (en) 1965-01-05 1965-12-22 Transport device for blanks, especially for machine tools

Country Status (3)

Country Link
US (1) US3353822A (fr)
DE (1) DE1266687B (fr)
FR (1) FR1462710A (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645377A (en) * 1968-12-25 1972-02-29 Igor Mikhailovich Kirko Method of orientation of nonmagnetic current-conducting bodies magnetic field and devices for carrying same into effect
US3661241A (en) * 1968-12-25 1972-05-09 Benyamin Alexandrovich Ioffe Apparatus for the simultaneous contactless separation of individual non-magnetic electrically conductive bodies from a continuous flow and orientation thereof
US3753513A (en) * 1971-05-06 1973-08-21 Badalex Ltd Handling and sorting devices
US3989164A (en) * 1974-06-08 1976-11-02 Itt Industries, Inc. Magnetic handling equipment
US4113142A (en) * 1975-07-14 1978-09-12 Vladimir Dmitrievich Ryzhov Device for contactless separation of individual ferromagnetic components from a flow of components
WO1982001842A1 (fr) * 1980-11-28 1982-06-10 Galenko Viktor G Dispositif d'alimentation orientee de pieces ferromagnetiques
US4387508A (en) * 1981-02-26 1983-06-14 Western Electric Company, Inc. Apparatus for magnetically assembling fragile parts
US4392766A (en) * 1981-09-21 1983-07-12 General Electric Company Automatic feeding apparatus
US4465415A (en) * 1981-05-27 1984-08-14 Siemens Aktiengesellschaft Magnetic spreading device for a sheet metal stack of individual magnetizable laminations with a central hole
EP0246927A1 (fr) * 1986-05-23 1987-11-25 Maghemite Inc. Propulsion par aimants permanents
EP0399125A1 (fr) * 1989-05-23 1990-11-28 Nippon Sanso Kabushiki Kaisha Appareil pour la manutention de plaques de tôle à usiner empilées
US20080054548A1 (en) * 2006-08-31 2008-03-06 Samsung Electronics Co., Ltd. Paper feeding apparatus and image forming apparatus having the same
WO2014094184A1 (fr) * 2012-12-17 2014-06-26 Soudronic Ag Dispositif de dégerbage et procédé de dégerbage de tôles métalliques
US9914599B2 (en) * 2015-12-04 2018-03-13 GM Global Technology Operations LLC Systems, processes and apparatuses for automated handling of non-ferrous metal objects
US20180093320A1 (en) * 2016-09-30 2018-04-05 GM Global Technology Operations LLC Strip holding device for the die of a stamping system
US20180193899A1 (en) * 2015-04-08 2018-07-12 Magswitch Technology Europe Gmbh Ferromagnetic sheet fanning and gripping device
US11292675B1 (en) * 2020-11-10 2022-04-05 Ford Global Technologies, Llc Apparatus having integrated electromagnetic coil and suction cup assembly for destacking a stack of blanks

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU529782A1 (ru) * 1975-08-01 1978-04-25 Институт физики АН Латвийской ССР Устройство дл транспортировани и накоплени ферромагнитных деталей
GB1533965A (en) * 1977-04-06 1978-11-29 Inst Fiz An Latvssr Device for magnetically arranging ferromagnetic components at preset distances from one another
DE3029086C2 (de) * 1980-07-31 1985-08-29 Siemens AG, 1000 Berlin und 8000 München Verfahren zum Vereinzeln ferromagnetischer Bleche und zugehörige Vorrichtungen
FR2504503B1 (fr) * 1981-04-24 1985-06-28 Inst Fiz Akad Nauk Dispositif pour l'amenee orientee de pieces en materiau ferromagnetique
JPS57199728A (en) * 1981-06-04 1982-12-07 Fanuc Ltd Parts feeder
DE3615186A1 (de) * 1986-05-05 1987-11-12 Thyssen Edelstahlwerke Ag Elektrospreizmagnetsystem
FR2640946A1 (en) * 1988-12-23 1990-06-29 Peugeot Machine for automatic conveying and destacking of workpieces having a complex shape
DE20115017U1 (de) * 2001-09-11 2003-02-06 Wagner Magnete GmbH & Co. KG, 87751 Heimertingen Elektrospreizmagnet
DE10213522A1 (de) * 2002-03-26 2003-10-23 Eagle Picher Wolverine Gmbh Verfahren zum Vereinzeln von gestapelten Blechen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795340A (en) * 1954-12-28 1957-06-11 American Can Co Magnetic stacking mechanism
US2860874A (en) * 1955-06-16 1958-11-18 Harris Intertype Corp Magnetic separation of piled magnetic sheets

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE12359C (de) * G. FÄRBER in Augsburg Vorrichtung zum Richtigsetzen der Kegel bei Kegelspielen
US1051056A (en) * 1912-02-15 1913-01-21 Miles R Bracewell Levitating apparatus for conveying ammunition, &c.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795340A (en) * 1954-12-28 1957-06-11 American Can Co Magnetic stacking mechanism
US2860874A (en) * 1955-06-16 1958-11-18 Harris Intertype Corp Magnetic separation of piled magnetic sheets

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645377A (en) * 1968-12-25 1972-02-29 Igor Mikhailovich Kirko Method of orientation of nonmagnetic current-conducting bodies magnetic field and devices for carrying same into effect
US3661241A (en) * 1968-12-25 1972-05-09 Benyamin Alexandrovich Ioffe Apparatus for the simultaneous contactless separation of individual non-magnetic electrically conductive bodies from a continuous flow and orientation thereof
US3753513A (en) * 1971-05-06 1973-08-21 Badalex Ltd Handling and sorting devices
US3989164A (en) * 1974-06-08 1976-11-02 Itt Industries, Inc. Magnetic handling equipment
US4113142A (en) * 1975-07-14 1978-09-12 Vladimir Dmitrievich Ryzhov Device for contactless separation of individual ferromagnetic components from a flow of components
WO1982001842A1 (fr) * 1980-11-28 1982-06-10 Galenko Viktor G Dispositif d'alimentation orientee de pieces ferromagnetiques
AT378495B (de) * 1980-11-28 1985-08-12 Inst Fiz An Latvssr Einrichtung zum orientierten vorschub ferromagnetischer teile
US4387508A (en) * 1981-02-26 1983-06-14 Western Electric Company, Inc. Apparatus for magnetically assembling fragile parts
US4465415A (en) * 1981-05-27 1984-08-14 Siemens Aktiengesellschaft Magnetic spreading device for a sheet metal stack of individual magnetizable laminations with a central hole
US4392766A (en) * 1981-09-21 1983-07-12 General Electric Company Automatic feeding apparatus
EP0246927A1 (fr) * 1986-05-23 1987-11-25 Maghemite Inc. Propulsion par aimants permanents
EP0399125A1 (fr) * 1989-05-23 1990-11-28 Nippon Sanso Kabushiki Kaisha Appareil pour la manutention de plaques de tôle à usiner empilées
US20080054548A1 (en) * 2006-08-31 2008-03-06 Samsung Electronics Co., Ltd. Paper feeding apparatus and image forming apparatus having the same
US7828280B2 (en) * 2006-08-31 2010-11-09 Samsung Electronics Co., Ltd. Paper feeding apparatus and image forming apparatus having the same
US20100327512A1 (en) * 2006-08-31 2010-12-30 Samsung Electronics Co., Ltd. Paper feeding apparatus and image forming apparatus having the same
WO2014094184A1 (fr) * 2012-12-17 2014-06-26 Soudronic Ag Dispositif de dégerbage et procédé de dégerbage de tôles métalliques
EP3056293A1 (fr) * 2012-12-17 2016-08-17 Soudronic AG Dispositif de désempilage et procédé de désempilage de tôles métalliques
US10479620B2 (en) 2012-12-17 2019-11-19 Soudronic Ag Destacking device and method for destacking metal sheets
US20180193899A1 (en) * 2015-04-08 2018-07-12 Magswitch Technology Europe Gmbh Ferromagnetic sheet fanning and gripping device
US9914599B2 (en) * 2015-12-04 2018-03-13 GM Global Technology Operations LLC Systems, processes and apparatuses for automated handling of non-ferrous metal objects
US9926146B2 (en) * 2015-12-04 2018-03-27 GM Global Technology Operations LLC Magnetodynamic apparatus and method for separating non-ferrous conductive blanks
US20180093320A1 (en) * 2016-09-30 2018-04-05 GM Global Technology Operations LLC Strip holding device for the die of a stamping system
US10507510B2 (en) * 2016-09-30 2019-12-17 GM Global Technology Operations LLC Strip holding device for the die of a stamping system
US11292675B1 (en) * 2020-11-10 2022-04-05 Ford Global Technologies, Llc Apparatus having integrated electromagnetic coil and suction cup assembly for destacking a stack of blanks

Also Published As

Publication number Publication date
FR1462710A (fr) 1966-12-16
DE1266687B (de) 1968-04-18

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