US3339915A - Method and apparatus for handling ferromagnetic sheets - Google Patents

Method and apparatus for handling ferromagnetic sheets Download PDF

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Publication number
US3339915A
US3339915A US465933A US46593365A US3339915A US 3339915 A US3339915 A US 3339915A US 465933 A US465933 A US 465933A US 46593365 A US46593365 A US 46593365A US 3339915 A US3339915 A US 3339915A
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US
United States
Prior art keywords
location
sheet
conveyer
sheets
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
US465933A
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English (en)
Inventor
Ricard Maurice
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.)
Cefilac SA
Original Assignee
Cefilac SA
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 Cefilac SA filed Critical Cefilac SA
Application granted granted Critical
Publication of US3339915A publication Critical patent/US3339915A/en
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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
    • 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
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/18—Advancing work in relation to the stroke of the die or tool by means in pneumatic or magnetic engagement with the work
    • 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
    • B65G59/045—De-stacking from the top of the stack by suction or magnetic devices with a stepwise upward movement of the stack
    • 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 apparatus for handling ferromagnetic metal sheets, particularly sheets having some substantial flexibility.
  • the object of the invention is to provide an improved method and apparatus for transferring such sheets from a first location to a second location.
  • the sheets to be handled usually come in stacks.
  • the method and apparatus of the invention provides for unstacking them one by one and transferring them from the location of the stack to another location.
  • tail end is applied to the end of the sheet, or of the stack, which is nearest to the second location (to which the sheets are transferred), and the term head end to the end farthest from it.
  • the sheets are usually separated by a so-called fanner which by magnetic action holds the sheets slightly apart on one or more sides.
  • Pneumatic devices are also in use which facilitate the separation of the sheets as they are being gripped without first fanning them out.
  • the invention provides an improved apparatus, and improved method, for transferring flexible sheets of ferromagnetic metal from a first location to a second location, which overcomes the foregoing disadvantages.
  • the apparatus comprises a conveyer disposed above and spaced from and extending between the two locations.
  • the magnet associated with the conveyer establishes a magnetic field in the space between the conveyer and said locations.
  • Means are provided for lifting the head end portion of the flexible sheets, one at a time, from the first location to a position within the magnetic field where the lifted end portion of the sheet is magnetically attracted into engagement with the conveyer, and successive portions of the sheet thereupon become magnetically attracted into engagement with the conveyer until the entire sheet is held magnetically in contact with the conveyer against the force of gravity.
  • Means are provided for moving the conveyer from above the first location to the second location, whereby the sheet which is magnetically held by the conveyer is transferred from a position above the first location to the second location.
  • the conveyer in the vicinity of the second location advances the sheet beyond that region of the magnetic field wherein the metal of the sheet is magnetically supported against the force of gravity, and in consequence the sheet is progressively released from the conveyer and successive portions thereof dropped to the second location as the sheet is advanced over the second location by the conveyer.
  • the method of the invention which is employed in operation of the above described apparatus, involves establishing a magnetic field which extends from above the first location to near the second location between which the sheets are to be transferred.
  • the head end portion only of the sheets, one at a time is lifted from the first location to a position within the magnetic field where such lifted end portion is magnetically supported against the force of gravity.
  • successive portions of the sheet become magnetically attracted into said field until the entire sheet is supported magnetically above the first location.
  • the sheet is transferred to above the second location.
  • There the sheet is advanced beyond the region of the magnetic field where the sheet is supported against the force of gravity, and in consequence successive portions of the sheet are dropped to said second location until the entire sheet is there deposited.
  • the gripping system is able to move toward and into engagement with a sheet while the preceding sheet is still being transferred, with the result that the duration of a cycle is substantially less than the sum of the gripping and moving times.
  • the unstacking rate can thus be considerably increased.
  • a feature of the invention is that the spacing between two sheets being transferred on the conveyer may be varied simply by adjusting the gripping rate.
  • the arrangement may even be such that two successive sheets overlap over a given length that is adjustable over a wide range. This is of interest in feeding a variety of machines, and particularly certain reheating furnaces.
  • This feature permits dispensing with intermediate conveyers whose sole function is to regulate spacing between sheets.
  • the invention also makes it possible, by simple adjustment of the operating rate and stroke of a plurality of gripping devices serving a single conveying means, to feed one machine from several stacks of sheets of different sizes while maintaining the spacing between two consecutive sheets constant.
  • the apparatus of the invention is used in association with an elevator table on which the sheets are stacked, and with a sheet fanner, which may be either magnetic or pneumatic, at the head end of the stack to fan out the head end portion of at least the uppermost sheets in the stack.
  • a sheet fanner which may be either magnetic or pneumatic
  • the lifting means advantageously is capable of upward and downward motion. It may, for example, consist of a magnetic roll turning freely on its shaft, the direction of its field being radial at each point on its periphery and thus normal to the sheet at the point of contact. Thus there will be no need to impart a rocking motion to it but merely an alternating downward and upward movement.
  • the conveyer advantageously is a belt conveyer.
  • the field holding the sheet on the conveyer may be produced, for example, by one or more longitudinal, fixed magnetic rails disposed above the conveyer belt, i.e., directly above the lower course of the belt, to the lower surface of which the sheet is to be held.
  • the magnetic field may also be generated by the conveyer itself, if the latter is magnetic, or by a series of magnetic rolls.
  • FIGS. 1 to 4 show the application of the invention schematically, and illustrate successive stages in the handling of a sheet in accordance with the invention.
  • the apparatus comprises an elevator table 1, a stack of sheets 2 at a first location, and a fanner 3 by which the head end portion of the uppermost sheets are fanned out.
  • the second location to which the sheets are to be transferred is at 4.
  • a vertically movable magnetic lifting roll -5 is located adjacent the head end of the stack 2 in position to engage the fanned out end pontions of the sheets.
  • Lifting magnet 6, including a magnetic roll 7, generate a magnetic field which, down to the limit indicated by the broken line 8, is sufliciently strong to support a sheet from the stack 2 against the force of gravity.
  • a conveyer belt 9 passes around the magnetic roll 7 and another nonmagnetic supporting roll 10 which is driven by means not shown in the direction of the arrow.
  • FIG. 1 shows such a sheet 11 which is being advanced by the conveyer beyond the region of the magnetic field where the sheet is supported against the force of gravity. As it passes beyond such region, successive portions of the sheet drop from the conveyer to the second location.
  • the magnetic lifting roll 5 after having been lowered to the position shown in dotted lines to engage the uppermost of the fanned out end portions of the sheets 12, has lifted such sheet from the stack 2 and has brought the portion from A to B into the zone of attraction of the magnetic field wherein the force of gravity is overcome.
  • the sheet is then attracted progressively and very rapidly over its entire length to the conveyer by a deformation which spreads from the head end to the tail end.
  • Successive positions of the sheet are shown in FIG. 3.
  • the solid line ABCDEF shows a first position assured by the sheet 12, and then it rapidly deforms through succeeding positions (such as those shown in dashed lines in FIG.
  • the sheet may be released from the lifting roll either 'by being rolled therefrom; or the magnetic field of the lifting roll may be momentarily shut off.
  • the lifting roll may begin its descent to engage the next sheet before the preceding sheet has been advanced wholly beyond the location of the stack 2.
  • Apparatus for transferring flexible sheets of ferromagnetic metal from a stack at a first location to a second location comprising (1) a movable conveyer disposed above and spaced from and extending between said locations,
  • Apparatus according to claim 1 in which the con- 'veyer is a belt conveyer and the magnets are disposed in close proximity to the conveyer belt above the surface thereof engaged by the magnetically supported sheets.
  • Apparatus for transferring flexible sheets of ferromagnetic metal one by one from a stack of said sheets disposed at a first location to a second location comprismg (l) a conveyer belt disposed above and spaced from and extending between said locations,
  • reciprocable lifting means mounted in position to engage the uppermost of the fanned out end portions of the stack of sheets and to lift such end portion to a position within said field where it is magnetically attracted into engagement with the conveyer belt and successive portions of the uppermost sheet progressing toward the end thereof adjacent said second location thereupon become magnetically attracted into engagement with said belt until the entire sheet is held magnetically against the force of gravity in engagement with the underside of the conveyer belt, and

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US465933A 1964-06-26 1965-06-22 Method and apparatus for handling ferromagnetic sheets Expired - Lifetime US3339915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR979813A FR1407842A (fr) 1964-06-26 1964-06-26 Procédé et dispositif de manutention

Publications (1)

Publication Number Publication Date
US3339915A true US3339915A (en) 1967-09-05

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ID=8833328

Family Applications (1)

Application Number Title Priority Date Filing Date
US465933A Expired - Lifetime US3339915A (en) 1964-06-26 1965-06-22 Method and apparatus for handling ferromagnetic sheets

Country Status (4)

Country Link
US (1) US3339915A (enExample)
BE (1) BE665497A (enExample)
CH (1) CH447995A (enExample)
FR (1) FR1407842A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584866A (en) * 1968-05-27 1971-06-15 Ropak Mfg Co Magnetic conveyor
US3726520A (en) * 1969-08-13 1973-04-10 Hitachi Ltd Apparatus for automatically conveying sheets of paper by means of electrostatic adsorption
JPS5277182U (enExample) * 1976-11-16 1977-06-09
US5389190A (en) * 1993-03-19 1995-02-14 Bedford Industries, Inc. Apparatus and method for applying a twist-tie to a packaging container
US5390473A (en) * 1993-09-16 1995-02-21 Bedford Industries, Inc. Tin-tie clip bending device and method
US5402619A (en) * 1993-09-16 1995-04-04 Bedford Industries, Inc. Tin-tie bending machine
US20180215562A1 (en) * 2017-01-30 2018-08-02 Oyabe Seiki Co., Ltd Sheet materials separation-aiding apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2534819C2 (de) * 1975-08-05 1983-12-15 L. Schuler GmbH, 7320 Göppingen Vorrichtung zum Entstapeln und Transportieren von Platinen
US5261994A (en) * 1988-03-12 1993-11-16 Bridgestone/Firestone Inc. Flexible carrier for transporting flexible sheet material between work stations
GB8805922D0 (en) * 1988-03-12 1988-04-13 Holroyd Associates Ltd Improvements in & relating to handling means
US6506584B1 (en) 2000-04-28 2003-01-14 Battelle Memorial Institute Apparatus and method for ultrasonic treatment of a liquid

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1442718A (en) * 1920-03-04 1923-01-16 Jones & Laughlin Steel Company Conveyer
US1457830A (en) * 1921-08-18 1923-06-05 Reginald B Gerhardt Automatic work feeder
US2474141A (en) * 1945-10-11 1949-06-21 American Can Co Method and apparatus for feeding sheets
US2895733A (en) * 1956-04-10 1959-07-21 L W Nash Company Electromagnet controls for sheet handlers
US2999687A (en) * 1958-12-23 1961-09-12 American Can Co Sheet feeder
US3224757A (en) * 1964-05-07 1965-12-21 Ropak Mfg Co Magnetic sheet transferring apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1442718A (en) * 1920-03-04 1923-01-16 Jones & Laughlin Steel Company Conveyer
US1457830A (en) * 1921-08-18 1923-06-05 Reginald B Gerhardt Automatic work feeder
US2474141A (en) * 1945-10-11 1949-06-21 American Can Co Method and apparatus for feeding sheets
US2895733A (en) * 1956-04-10 1959-07-21 L W Nash Company Electromagnet controls for sheet handlers
US2999687A (en) * 1958-12-23 1961-09-12 American Can Co Sheet feeder
US3224757A (en) * 1964-05-07 1965-12-21 Ropak Mfg Co Magnetic sheet transferring apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584866A (en) * 1968-05-27 1971-06-15 Ropak Mfg Co Magnetic conveyor
US3726520A (en) * 1969-08-13 1973-04-10 Hitachi Ltd Apparatus for automatically conveying sheets of paper by means of electrostatic adsorption
JPS5277182U (enExample) * 1976-11-16 1977-06-09
US5389190A (en) * 1993-03-19 1995-02-14 Bedford Industries, Inc. Apparatus and method for applying a twist-tie to a packaging container
US5390473A (en) * 1993-09-16 1995-02-21 Bedford Industries, Inc. Tin-tie clip bending device and method
US5402619A (en) * 1993-09-16 1995-04-04 Bedford Industries, Inc. Tin-tie bending machine
US20180215562A1 (en) * 2017-01-30 2018-08-02 Oyabe Seiki Co., Ltd Sheet materials separation-aiding apparatus
US10457508B2 (en) * 2017-01-30 2019-10-29 Oyabe Seiki Co., Ltd Sheet materials separation-aiding apparatus

Also Published As

Publication number Publication date
FR1407842A (fr) 1965-08-06
CH447995A (fr) 1967-12-15
BE665497A (enExample) 1965-10-18

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