EP2163384A2 - Séparation de plaques dotée de champs magnétiques - Google Patents

Séparation de plaques dotée de champs magnétiques Download PDF

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Publication number
EP2163384A2
EP2163384A2 EP09168812A EP09168812A EP2163384A2 EP 2163384 A2 EP2163384 A2 EP 2163384A2 EP 09168812 A EP09168812 A EP 09168812A EP 09168812 A EP09168812 A EP 09168812A EP 2163384 A2 EP2163384 A2 EP 2163384A2
Authority
EP
European Patent Office
Prior art keywords
stack
printing plates
plates
printing
magnetic field
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Withdrawn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
EP09168812A
Other languages
German (de)
English (en)
Other versions
EP2163384A3 (fr
Inventor
Reiner Jordt
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP2163384A2 publication Critical patent/EP2163384A2/fr
Publication of EP2163384A3 publication Critical patent/EP2163384A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • B65H3/60—Loosening articles in piles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/60—Devices for transferring printing plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1928—Printing plate

Definitions

  • the invention relates to a method and a device for separating printing plates from a stack of printing plates with superimposed printing plates or intermediate printing plates lying intermediate layers.
  • Such a method and such a device is needed z.
  • printing plates for offset printing machines are provided in the respective cassettes or on the trays described. To protect the surfaces, they are generally separated from one another by means of intermediate layers. These liners may be paper liners.
  • a device For applying a printing plate stack with appropriate blowing air, a device must be provided laterally of the printing plate stack for generating the blowing air. A corresponding space requirement at the side of the printing plate stack is therefore present.
  • this method and device for separating the printing plates is at least complicated, if not impossible.
  • the object of the present invention is therefore to provide a method and a device by means of which the described problems of the known methods and devices can be avoided, at least reduced.
  • the object of the invention is achieved in method view by a generic method in which at least in the two uppermost plates of the stack eddy currents are induced with the same direction of rotation, through which the printing plates are repelled from each other.
  • At least one magnetic element for generating an alternating magnetic field with a non-negligible vertical component in at least one edge region of the stack is supplied to the stack of printing plates for separating at least one uppermost printing plate.
  • this magnetic element the eddy currents can be induced, in particular in the edge region of the stack of successive printing plates, which lead to corresponding repulsion effects of the printing plates.
  • this alternating field is operated at a frequency in the range of 25 Hz.
  • a frequency should be used which corresponds to the natural frequency of the printing plate used or at least comes close.
  • the printing plates of the stack are separated from one another by electrically insulating intermediate layers. These are provided in a development so that it is either materially separated from the printing plates paper liners, or alternatively are polymer layers, which are preferably applied as a layer on the printing plates whose back.
  • the object of the invention is further achieved by an apparatus according to claim 7, in which for separating printing plates from a stack of printing plates with superimposed printing plates or between printing plates lying intermediate layers, preferably for carrying out a method according to the previously described process steps at least temporarily at least one magnetic member suitable for generating an alternating magnetic field with a non-negligible vertical component which is associated with the edge region of the stack.
  • this magnetic element By this magnetic element, the desired alternating magnetic field can be generated, with which the printing plates are separated from each other.
  • the pressure plates are made of an electrically conductive material and the intermediate layers essentially constitute an insulator.
  • these intermediate layers may be a non-conductive polymer layer as coating of at least one side of a printing plate, preferably the rear side of the printing plate and / or an intermediate paper having insulating properties, between two printing plates.
  • the magnetic member has a substantially centered soft iron core with a coil body circumferentially surrounding it, wherein the soft iron core is aligned perpendicular to the stack and bobbin and soft iron cores are arranged so that one generated by an AC voltage to the bobbin time varying magnetic field is amplified by the soft iron core in the direction of the stack.
  • a lifter preferably a siphon in the region of the stack is ready and is suitable to lift the top pressure plate and / or intermediate layer completely from the stack or remove.
  • the lifted by the magnetic fields uppermost pressure plate can then easily by means of this siphon or lifting organs further uses, for. B. in a printing platesetter supplied.
  • the intended use may, for example, be the imaging on an exposure drum.
  • the FIG. 1 shows a printing plate stack 1, which is constructed of printing plates 2 and between two printing plates 2 arranged intermediate layers 3.
  • the printing plate stack 1 can be z. B. be provided in a printing plate cassette, not shown, or on a printing plate tray.
  • a magnet element 4 is provided in the region above the uppermost printing plate 2 of the printing plate stack 1.
  • the magnet element 4 is separated by a gap 7 from the uppermost pressure plate 2.
  • the magnetic member B is constructed of a soft iron core 5, which is enclosed by a bobbin 6.
  • a power source 8 an alternating electric field.
  • This alternating electric field preferably has a frequency of 25 Hz.
  • FIG. 2 For the action of the magnetic field 10 on the printing plate stack 1 is in FIG. 2 a corresponding schematic diagram shown.
  • a magnetic field 10 is generated, which penetrates into the pressure plates 2 of the printing plate stack 1. At least this magnetic field 10 acts on the uppermost printing plates 2 of the printing plate stack 1.
  • the printing plates 2 are separated from each other by a paper interlayer 3, the paper interlayer 3 acting as an insulator here.
  • eddy currents 11 and 12 are induced in the pressure plates.
  • the static case illustrated here shows the state of the eddy currents 11, 12 in two successive pressure plates 2 of the stack 1.
  • the eddy currents 11, 12 induced here are oriented at least in the same direction, ie. H. they have the same sense of rotation.
  • the eddy currents 11, 12 induced here are oriented at least in the same direction, ie. H. they have the same sense of rotation.
  • the spaced pressure plates 2 are repelled from each other with the force 13, here represented by a double arrow.
  • a suitable frequency for the current of the current source 8 is selected, then the effect of pressure plates 2 bucking and buckling occurs.
  • An electric current of 2 to 3 amperes is preferred here for a number of 500 windings for the bobbin 6.
  • the frequency has For the electric current experimentally preferred to give 25 Hz with a rectangular waveform for the electric current.
  • the magnetic member 4 is designed such that it can also be pivoted out of the region of the printing plate stack 1. For example, it can be pivoted horizontally out of the area of the printing plate stack or raised vertically.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP09168812A 2008-09-15 2009-08-27 Séparation de plaques dotée de champs magnétiques Withdrawn EP2163384A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008047373 2008-09-15

Publications (2)

Publication Number Publication Date
EP2163384A2 true EP2163384A2 (fr) 2010-03-17
EP2163384A3 EP2163384A3 (fr) 2010-04-14

Family

ID=41404558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09168812A Withdrawn EP2163384A3 (fr) 2008-09-15 2009-08-27 Séparation de plaques dotée de champs magnétiques

Country Status (2)

Country Link
EP (1) EP2163384A3 (fr)
DE (1) DE102009039458A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105752670A (zh) * 2016-05-09 2016-07-13 河北工业大学 一种铁磁性材料薄片连续输送及磁性分离装置
CN111923588A (zh) * 2020-07-15 2020-11-13 刘忠卫 一种印刷品凹凸压印系统及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012102239B4 (de) * 2012-03-16 2021-05-20 Hanwha Q Cells Gmbh Substrataufnahmeverfahren und Substrattrennungssystem
DE102016123355B4 (de) 2015-12-04 2020-06-18 Gm Global Technology Operations, Llc Elektrodynamische vorrichtung zum trennen elektrisch leitender, eisenfreier rohlinge, die in einem stapel angeordnet sind

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049385A1 (de) 2004-10-08 2006-04-13 Heidelberger Druckmaschinen Ag Vorrichtung und Verfahren zum Vereinzeln von Druckplatten eines Stapels
EP1232976B1 (fr) 2001-01-29 2006-10-18 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour séparer des plaques d'impression

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH307394A (fr) * 1951-09-04 1955-05-31 Hercules Electric And Manufact Appareil pour séparer les feuilles d'une pile de feuilles magnétisables.
EP0905067A1 (fr) * 1997-09-11 1999-03-31 W.P. Mechanics N.V. Procédé et dispositif pour enlever une feuille d'une pile de feuilles
ES2160050B1 (es) * 1999-04-26 2002-05-16 Asm S A Dispositivo para separacion, levantamiento y traslado de chapas de aluminio u otro material no ferromagnetico.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1232976B1 (fr) 2001-01-29 2006-10-18 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour séparer des plaques d'impression
DE102004049385A1 (de) 2004-10-08 2006-04-13 Heidelberger Druckmaschinen Ag Vorrichtung und Verfahren zum Vereinzeln von Druckplatten eines Stapels

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105752670A (zh) * 2016-05-09 2016-07-13 河北工业大学 一种铁磁性材料薄片连续输送及磁性分离装置
CN105752670B (zh) * 2016-05-09 2017-12-19 河北工业大学 一种铁磁性材料薄片连续输送及磁性分离装置
CN111923588A (zh) * 2020-07-15 2020-11-13 刘忠卫 一种印刷品凹凸压印系统及方法

Also Published As

Publication number Publication date
DE102009039458A1 (de) 2010-04-15
EP2163384A3 (fr) 2010-04-14

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