[go: up one dir, main page]

EP0905067A1 - Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel - Google Patents

Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel Download PDF

Info

Publication number
EP0905067A1
EP0905067A1 EP97202786A EP97202786A EP0905067A1 EP 0905067 A1 EP0905067 A1 EP 0905067A1 EP 97202786 A EP97202786 A EP 97202786A EP 97202786 A EP97202786 A EP 97202786A EP 0905067 A1 EP0905067 A1 EP 0905067A1
Authority
EP
European Patent Office
Prior art keywords
sheet
pushing
pulling
force
elements
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Withdrawn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
EP97202786A
Other languages
English (en)
French (fr)
Inventor
Michel Maho
Paul Ramaeckes
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.)
Wp Mechanics Nv
Original Assignee
Wp Mechanics Nv
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 Wp Mechanics Nv filed Critical Wp Mechanics Nv
Priority to EP97202786A priority Critical patent/EP0905067A1/de
Publication of EP0905067A1 publication Critical patent/EP0905067A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the top of pile
    • 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
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • 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
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/48—Air blast acting on edges of, or under, articles
    • 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
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/423—Depiling; Separating articles from a pile
    • B65H2301/4234—Depiling; Separating articles from a pile assisting separation or preventing double feed
    • B65H2301/42342—Depiling; Separating articles from a pile assisting separation or preventing double feed vibrating

Definitions

  • the invention relates to a method for removing a sheet from a stack of sheets wherein a pulling member is temporarily and removably adhered to said sheet and wherein a pulling force is applied by said pulling member on at least two different points of said sheet.
  • the invention also relates to a device for removing a sheet from a stack of sheets.
  • Such a method and such a device are known in the art.
  • the known method is for example applied in the steel, wood or plastic manufacturing where sheets of steel, as wood or plastic are stacked and have to be removed sheet by sheet from the stack for further processing.
  • the pulling member is brought above the stack and subsequently lowered until it reaches the top sheet of the stack.
  • the pulling member is then temporarily adhered to the top sheet in order to apply a pulling force on the sheet and lift the sheet up from the stack to bring it to a place where it should be processed. Once the sheet is on that place the pulling member is removed from the sheet and brought back to its initial position.
  • a drawback of the known method and device is that often more than one sheet is lift up and removed from the stack.
  • electrical charges, remnant magnetism, oil rests etc. causes that the subsequent sheets of the stack stick to each other and do not separate from each other or only after a few seconds when the sheet(s) are already transported. This leads to perturbations in the manufacturing and sometimes to severe damages.
  • a method according to the present invention is therefor characterised in that a pushing force is applied on said sheet on at least one further location situated between said two points, by applying a pushing force a compression strain is induced in the upper layer of the sheet, whereas the pulling force exerted on both sides of the point where the pushing force is applied, induces a tensile strain in the under layer of the sheet. So for two subsequent sheets of the stack the under layer of the top sheet will feel a tensile strain and the upper layer of the subsequent sheet will feel a compression strain. These opposite forces on two adjacent sides will cause the subsequent sheets to detach from each other, so that only one sheet will be removed from the stack.
  • a first preferred embodiment of a method according to the invention is characterised in that a gas burst is projected on a lateral side of said stack which lateral side is substantially perpendicular to a surface on which said pulling force is applied.
  • the projection of a gas burst further improves the detachment of stacked sheets which would stick together.
  • a second preferred embodiment of a method according to the present invention is characterised in that said pushing force is applied over the distance of a line situated between said two points.
  • the pushing force is in such a manner applied over the whole distance of the line which enables to increase the compression force applied on the upper layer of the sheet.
  • a preferred embodiment of a device according to the present invention is characterised in that said pulling and said pushing elements are load adjustably mounted, and in particular that said pulling elements and said pushing elements are connected to a same support bar. This enables to adjust the pulling and pushing member at a predetermined preload value and enables in particular the use of a same motor for controlling both the pushing and pulling element 1.
  • a further preferred embodiment of a device according to the present invention is characterised in that said pulling elements and said pushing elements are provided with a pulling respectively a pushing head mounted at an extremity of said pulling respectively said pushing element facing said sheet, said pushing heads being mounted offset in a direction away from said sheet with respect to said pulling heads.
  • the device 1 for removing a sheet 17 from a stack 18 of sheets illustrated in figure 1 comprises a pulling member 2 having at least two pulling elements (2-1, 2-2, 2-3, 2-4,-).
  • the pulling elements are mounted to a support member 9 which can be moved on a frame 15 by means for example of a set of wheels 16 enabling an X-Y movement of the support member 9.
  • the support member can adjust the position of the pulling member 2 with respect to the stack 18 and transport the sheets from the stack to a place where further manufacturing will take place.
  • the sheets on the stack can be for example made of steel, wood, plastic,....
  • the sheets are thin, i . e . less than 1,5 cm whereas the problem of subsequent sheets on a stack sticking together due to electrical charges, adhesion, remnant magnetism, oil rests etc., is more important with thin sheets.
  • a spring 7 is wrapped around the tube and a preload is given to that spring by means of the bolts 11.
  • the tube 6 ends in a connecting mouth 5 to which a vacuum pump (not shown) is connectable.
  • the vacuum pump enables to suck the air in the tube and between the cup and the sheet 17 when the cup is placed on the sheet. In such a manner the cup and thus the pulling member is temporarily adhered to the sheet.
  • the cup is removed from the sheet by letting air flow into the tube.
  • the present invention is not limited to a pneumatic pulling element 2 as just described.
  • Other alternatives are possible depending on the material of which the sheets are made.
  • magnetic cups could be used and the tube 6 could be replaced by a rod.
  • the adhesion of the cup to the steel sheet could then be realised by inducing an electrical current in a coil in order to apply a magnetic field in the cup which would attract the steel sheet.
  • a hydraulic solution using oil or water pressure could also be applied instead of a spring 7 to give a preload to the pulling elements.
  • At least one motor 8 is mounted on the support bar 20, to which the pulling member is mounted.
  • the motor is either an electrical, hydraulic or pneumatic motor, and enables a lift up and a lowering of the pulling member 2.
  • the latter is mounted on a guiding rail 21.
  • a pushing member 3 comprising at least one pushing element 3-1, 3-2, 3-3,... is also mounted on the support member 9.
  • Each pushing member comprises a pushing head 26 mounted at the extremity of a rod 27 around which a spring 12 is wrapped between the other extremity of the rod and a further support bar 28 through which the rod 27 passes and which is part of the support member 9.
  • a set screw 13 enables to set the pushing element at a calibrated height with respect to the extremity of the cup 19 facing the sheet 17, in such a manner that at rest the pushing head 26 is offset from the cup 19 in a direction away from the sheet 17.
  • a further motor 29 is mounted to the further support bar 28 and enables the pushing member to exert a pushing force on the sheets.
  • connection bar 4 comprises a curved end in order not to disturb the bending of the sheets as will be described hereinafter.
  • the presence of such a connection bar is however optional and enables to exert a uniform pushing force over the whole length of the bar.
  • the pulling member 2 and the pushing member 3 are mounted on a same support bar, to which a motor is connected.
  • bending of the plate can be obtained by providing in said pushing member a spring having a higher preload than the spring 7 from the pulling member.
  • the device according to the present invention further comprises a gas blower 22 connected via a duct 30 to a gas source 24.
  • a control valve 25 having an input for receiving a control signal 23 is mounted on the duct 30.
  • the control valve 25 Upon receipt of the control signal generated by a control unit (not shown) the control valve 25 is opened so that a gas burst is exhausted via the blower 22.
  • the blower 22 is mounted on a lateral side of the stack, substantially perpendicular to the axis z of the pulling member 2. Therefor the blower blows the gas burst between the successive sheets of the stack so as to detach them from each other.
  • the pulling member 2 When a sheet 17 has to be removed from the stack 18, the pulling member 2 is brought towards the stack by a movement of the support member 9.
  • the motor 8 now causes the pulling elements 2 to move towards the sheet 17 until the cups 19 contact the sheet.
  • the cups are temporarily adhered to the sheet by, according to the preferred embodiment, applying a suction force via the mouths 5 on the cups 19. As the pushing members are offset from the cups, they are at this stage not yet in contact with the sheet.
  • the pushing elements 3 are each time mounted between two successive pulling elements 2. Once the cups 19 are adhered to the sheet 17, the pushing elements 3 are moved by means of the motor 29 towards the sheet so that the pushing head or the connection bar 4 contacts the sheet.
  • the motor 8 now starts to apply a force F 1 on the support bar 20 so as to raise the bar 20 and the pulling elements 2 attached thereon. This causes the force F 1 to be applied on the cups and thus on the sheet 17.
  • the motor 29 now causes a force F 2 of opposite direction with respect to F 1 wherein F 2 > F 1 .
  • the force F 2 is applied on the sheet 17 via the pushing elements 3-j.
  • the application of the force F 1 on both extremities of the sheets causes the latter to be bent according to a cosh function.
  • the force F 1 thus induces a tensile strain F 4 , F 4 ' in the under layer of sheet 17, where F 4 and F 4 ' have opposite directions.
  • F 3 and F 3 ' also being of opposite direction.
  • the force F 3 and F 3 ' thus causes a compression of the upper layer of the sheet
  • F 4 and F 4 ' causes an extension of the under layer of the sheet. So at a point P between two successive sheets opposite force are exerted since the under layer of sheet 17-1 feels the force F 4 and F 4 ' whereas the upper layer of sheet 17-2 feels the force F 3 and F 3 '.
  • the detachment of two successive sheets can further be improved by inducing, by means of the vibration element 14, and the pushing element 3 a vibration force into the sheet through the intermediary of the support bar 20 and/or 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP97202786A 1997-09-11 1997-09-11 Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel Withdrawn EP0905067A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97202786A EP0905067A1 (de) 1997-09-11 1997-09-11 Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97202786A EP0905067A1 (de) 1997-09-11 1997-09-11 Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel

Publications (1)

Publication Number Publication Date
EP0905067A1 true EP0905067A1 (de) 1999-03-31

Family

ID=8228720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97202786A Withdrawn EP0905067A1 (de) 1997-09-11 1997-09-11 Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel

Country Status (1)

Country Link
EP (1) EP0905067A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT410436B (de) * 2001-01-30 2003-04-25 Oesterr Forsch Seibersdorf Verfahren zum vereinzeln von in einem stapel übereinander angeordneten bögen und vorrichtung zur durchführung des verfahrens
EP1582486A1 (de) * 2004-03-31 2005-10-05 Mercandia Industries A/S Saugkopfeinrichtung zum Heben des obersten blattes eines Stapels von Furnierblättern, und Vorrichtung zum Laminieren von furnierten Brettern
EP1832537A1 (de) * 2006-03-06 2007-09-12 Kabushiki Kaisha Toshiba Vorrichtung zum Trennen und Abziehen
EP2163384A3 (de) * 2008-09-15 2010-04-14 Heidelberger Druckmaschinen AG Plattentrennung mit Magnetfeldern
CN102050337A (zh) * 2010-03-18 2011-05-11 深南电路有限公司 板膜抓取装置及其方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256793A1 (de) * 1972-07-10 1974-02-07 Pilot Pen Co Ltd Verfahren und vorrichtung zum ansaugen und abheben der obersten platte von einem plattenstapel
JPS56161240A (en) * 1980-05-15 1981-12-11 Matsushita Electric Works Ltd Separating device for tightly piled platelike body
DE3136544A1 (de) * 1981-09-15 1983-03-31 Trumpf GmbH & Co, 7257 Ditzingen "stapeltisch fuer bleche od. dgl."
EP0086280A1 (de) * 1982-02-12 1983-08-24 CAR VENTOMATIC S.p.A. Vorrichtung zum Entnehmen und Trennen von Söcken aus einem Stapel, welche in eine automatische Vorrichtung zum Aufstecken von Söcken eingeführt werden
DE4002324A1 (de) * 1990-01-26 1991-08-01 Bayerische Motoren Werke Ag Vorrichtung zum abnehmen einer platine von einem platinenstapel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256793A1 (de) * 1972-07-10 1974-02-07 Pilot Pen Co Ltd Verfahren und vorrichtung zum ansaugen und abheben der obersten platte von einem plattenstapel
JPS56161240A (en) * 1980-05-15 1981-12-11 Matsushita Electric Works Ltd Separating device for tightly piled platelike body
DE3136544A1 (de) * 1981-09-15 1983-03-31 Trumpf GmbH & Co, 7257 Ditzingen "stapeltisch fuer bleche od. dgl."
EP0086280A1 (de) * 1982-02-12 1983-08-24 CAR VENTOMATIC S.p.A. Vorrichtung zum Entnehmen und Trennen von Söcken aus einem Stapel, welche in eine automatische Vorrichtung zum Aufstecken von Söcken eingeführt werden
DE4002324A1 (de) * 1990-01-26 1991-08-01 Bayerische Motoren Werke Ag Vorrichtung zum abnehmen einer platine von einem platinenstapel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 048 (M - 119) 27 March 1982 (1982-03-27) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT410436B (de) * 2001-01-30 2003-04-25 Oesterr Forsch Seibersdorf Verfahren zum vereinzeln von in einem stapel übereinander angeordneten bögen und vorrichtung zur durchführung des verfahrens
EP1582486A1 (de) * 2004-03-31 2005-10-05 Mercandia Industries A/S Saugkopfeinrichtung zum Heben des obersten blattes eines Stapels von Furnierblättern, und Vorrichtung zum Laminieren von furnierten Brettern
EP1832537A1 (de) * 2006-03-06 2007-09-12 Kabushiki Kaisha Toshiba Vorrichtung zum Trennen und Abziehen
US7694957B2 (en) 2006-03-06 2010-04-13 Kabushiki Kaisha Toshiba Separation and extraction device
EP2163384A3 (de) * 2008-09-15 2010-04-14 Heidelberger Druckmaschinen AG Plattentrennung mit Magnetfeldern
CN102050337A (zh) * 2010-03-18 2011-05-11 深南电路有限公司 板膜抓取装置及其方法
CN102050337B (zh) * 2010-03-18 2013-04-10 深南电路有限公司 板膜抓取装置及其方法

Similar Documents

Publication Publication Date Title
JP6791286B2 (ja) ワーク吸着方法及び装置
EP0905067A1 (de) Verfahren und Vorrichtung zum Abnehmen eines Bogens von einem Stapel
CN205634288U (zh) 用于扁平物品的收纳、保持和/或操作装置
JPH0613222Y2 (ja) 板ガラスの位置決め装置
JPH06199420A (ja) 板材の積み重ね装置
JP3044834B2 (ja) 非磁性金属板の取出装置
CN106827562B (zh) 揭网布装置以及麦克风组装装置
WO2020008744A1 (ja) 搬送装置
EP0355107B1 (de) Verfahren und maschine zur automatischen anbringung von auswuchtgerichten
KR100984641B1 (ko) 필름 이송장치
CN100407385C (zh) 贴装半导体芯片的设备
JP5424969B2 (ja) 基板の搬送装置及び搬送方法
JP5170548B2 (ja) シート材分離機能付き把持ハンドとこれを用いたシート材分離把持方法
KR101797299B1 (ko) 강판 계수장치
JPH05175063A (ja) 変圧器鉄心の組立方法及び組立装置並びに変圧器鉄心
JPH07165344A (ja) 枚葉紙の紙さばき風入れ方法
JPH09240869A (ja) 板材の１枚取り方法およびその装置
KR20220068839A (ko) 디스플레이용 보호필름 제거장치 및 그 방법
JPH08139154A (ja) ウェハハンドリング方法及び装置
EP0836933A3 (de) Verfahren zur automatischen Zusammensetzung von beschichtetem Glas und Vorrichtung dafür
JP2002170726A (ja) 鉄心の組立装置並びに方法及びその薄鋼板分離装置並びに方法
CN1112821A (zh) 带有一个双杠杆的医疗器械
CN114132556B (zh) 贴膜装置、自动化贴膜产线及贴膜方法
JP2002187084A (ja) 平部材移送装置及びその使用方法
CN119492641B (zh) 一种新能源汽车电池支架抗弯折强度检测设备

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;RO;SI

AKX Designation fees paid
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19991002

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566