EP0786340A2 - Cylindre porte-cliché pour un cliché d'une matière de support magnétisable - Google Patents

Cylindre porte-cliché pour un cliché d'une matière de support magnétisable Download PDF

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Publication number
EP0786340A2
EP0786340A2 EP97100158A EP97100158A EP0786340A2 EP 0786340 A2 EP0786340 A2 EP 0786340A2 EP 97100158 A EP97100158 A EP 97100158A EP 97100158 A EP97100158 A EP 97100158A EP 0786340 A2 EP0786340 A2 EP 0786340A2
Authority
EP
European Patent Office
Prior art keywords
cliché
slot
base body
printing cylinder
holding
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Withdrawn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
EP97100158A
Other languages
German (de)
English (en)
Other versions
EP0786340A3 (fr
Inventor
Rolf Beck
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.)
Kocher and Beck and Co Rotationsstanztechnik KG GmbH
Original Assignee
Kocher and Beck and Co Rotationsstanztechnik KG 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 Kocher and Beck and Co Rotationsstanztechnik KG GmbH filed Critical Kocher and Beck and Co Rotationsstanztechnik KG GmbH
Publication of EP0786340A2 publication Critical patent/EP0786340A2/fr
Publication of EP0786340A3 publication Critical patent/EP0786340A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L29/00—Devices for attaching printing elements or formes to supports
    • B41L29/02—Devices for attaching printing elements or formes to supports magnetic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/02—Magnetic devices

Definitions

  • the invention relates to a printing cylinder for a cliché made of magnetizable carrier material, with a roller-shaped base body, which has on its periphery a slot for hanging an angled edge of the beginning of the cliché, with a plurality of holding magnets distributed over the circumference and with a holding magnet adjacent to the slot for the End of the cliché is provided, which extends approximately over the entire axial length of the base body.
  • the base body of a printing cylinder usually consists of aluminum or an aluminum alloy. It can be designed as a solid body, on which stub shafts are molded. However, it can also be a hollow cylinder that is connected to stub shafts and drive elements or that is attached to a shaft.
  • the clichés are usually made from a plastic film that is coated with a photopolymer that is exposed and etched according to the desired print image. The cliché is applied to the base body using double-sided adhesive tape glued all over. Replacing such a cliché is therefore very time-consuming.
  • a magnetizable carrier material for a cliché in particular a tinplate, which is coated with the photopolymer.
  • the beginning of the cliché is provided with an angled edge with which the cliché is hung in an axially extending and radially aligned slot in the base body.
  • holding magnets are arranged on both sides of the slot and in its immediate vicinity, which extend approximately over the entire length of the base body in the axial direction.
  • These holding magnets consist of individual magnetic elements, which are threaded onto a rod with changing polarity and glued into recesses in the base body. Distributed over the circumference of the base body are a large number of further holding magnets of this type, which likewise extend approximately over the entire length of the base body.
  • the invention has for its object to provide a pressure cylinder of the type mentioned, which allows an easy change of a plate.
  • a wall of the slot is formed from a strip which is provided within the slot with holding magnets for holding the angled edge of the cliché.
  • a holding magnet adjacent to the slot and assigned to the beginning of the printing block can be used be dispensed with, so that only the holding magnet assigned to the end of the cliché is present in the immediate region of the slot.
  • the holding magnets arranged within the slot in a strip further facilitate threading the angled edge into the slot, this angled edge also being drawn into the slot.
  • the beginning of the cliché, after the angled edge is threaded into the slot, is held with a relatively large force, so that the cliché can be stretched and smoothed out when it is laid around the base body of the printing cylinder with a correspondingly large force. This results in a very simple and, above all, quick exchange of a cliché, which is also very securely held on the base body of the printing cylinder.
  • the bar consists of magnetizable material. This results in a favorable distribution of the magnetic field lines, so that a relatively large force is obtained with relatively small magnets, with which the angled edge is drawn into the slot and held in the slot.
  • the bar is a steel bar which is held in an adhesive manner in the base body made of aluminum or an aluminum alloy.
  • the steel strip also has the advantage that the edge of the slot, around which the cliché is drawn, consists of a material that has a significantly higher strength than the material of the base body.
  • the slot and the bar form an acute angle with respect to the direction of rotation with a tangent applied to the circumference of the base body in the area of the slot. This thus obliquely directed against the direction of rotation leads to the fact that the angled edge of the cliché hardly when putting on is loaded with forces that could cause the edge to move out of the slot.
  • a holding magnet which is assigned to the beginning of the cliché and extends in the axial direction approximately over the length of the base body.
  • This holding magnet is arranged at a sufficient distance from the slot so that it does not affect the threading. However, he ensures that the cliché is securely pulled up and applied to the base body at a not too great distance from the angled edge, so that overall a secure contact of the cliché is ensured.
  • a further holding magnet which extends approximately over the entire axial length of the base body, is arranged parallel to the holding magnet assigned to the end of the cliché. This ensures that the cliché is held in the area of its end with particularly strong forces.
  • the holding magnets assigned to the beginning and the end of the cliché holding magnets are distributed uniformly over the circumference, each extending essentially only over the area of the longitudinal center of the base body. Since the cliché is held very securely in the area of its beginning and end, the holding magnets which are distributed in the remaining area essentially serve only as an assembly aid, while their function is not required during printing. This makes it possible to reduce the number of these holding magnets and also to shorten the axial length of these holding magnets.
  • the holding magnets for the beginning and / or the end of the cliché and / or in between over the circumference of the base body distributed holding magnets and / or the bar magnets are made of rare earth metals. These magnets produce very strong magnetic forces and also have the advantage that they represent one-piece elements which, as such, can be inserted and glued into recesses in the base body.
  • the base body (10) shown in Fig. 1 is designed as a solid roller which is made of aluminum or an aluminum alloy.
  • stub axles or stub axles must be provided on both end faces of the base body. These can be produced in one piece with the base body (10) or can also be separate components which are connected to the base body, for example by screws or other coupling elements. It is also possible to design the base body (10) as a cylindrical hollow body which is plugged onto an axis or shaft and connected to it in a rotationally fixed manner.
  • the base body (10) serves to hold a cliché which has a magnetizable carrier material, for example a tinplate.
  • This cliché starts with one provided angled edge, with which is suspended in a slot (11) of the circumference of the base body (10), which extends in the axial direction over the entire length of the base body (10).
  • the slot (11) has a width that is slightly larger than the thickness of the angled edge of the plate. The cliché is hooked into the slot by its angled edge, after which the cliché is wrapped around the circumference of the drum until its end comes to lie in the immediate vicinity of the slot (11).
  • the side wall of the slot facing the beginning of the cliché is formed from a bar (12) which extends over the entire axial length of the base body (10).
  • the strip (12) is inserted and glued into a recessed groove (13) in the base body (10).
  • the strip (12) consists of a magnetizable material, preferably steel.
  • this bar (12) two or more magnets (14, 15) are embedded, which are located in the slot (11) and which are flush with the side wall of the slot (11) formed by the bar (12).
  • a holding magnet (16) is used in the circumference of the base body (10), which extends approximately over the entire axial length of the Basic body (10) extends in the axial direction. This is followed at regular intervals by further holding magnets (17) which are evenly distributed over the circumference.
  • the holding magnets (17) have a relatively short axial extent, i.e. about 1 ⁇ 4 to 1/3 of the holding magnet (16), and are arranged only in the region of the longitudinal center plane of the base body (10).
  • a holding magnet (18) is inserted into the base body (10), which runs parallel to the slot (11) and extends essentially over the entire axial length of the base body (10) extends.
  • Parallel A further holding magnet (19) is arranged at a short distance from the holding magnet (18), for example at a distance of not more than 10 mm, which also extends approximately over the entire axial length of the base body (10).
  • the holding magnets (14, 15, 16, 17, 18 and 19) are made from rare earth metals. They are each inserted as a uniform body in the prepared receptacles of the strip (12) and the base body (10) and are obtained in these by means of an adhesive. After inserting the holding magnets (16, 17, 18, 19), the base body (10) is ground on the outside.
  • the slot (11) and thus also the bar (12) extends obliquely to the radial of the base body (10) in such a way that in the direction of rotation (A) between a tangent of the impression cylinder and the slot walls in the area of the slot (11) results in an acute angle which is of the order of 10 ° to 60 ° and is preferably less than 45 °.
  • Threading is relatively simple, since a holding magnet, namely the holding magnet (18), is arranged only on one side of the slot (11).
  • the holding magnets (14 and 15) located within the slot (11) and inserted into the bar (12) support the threading and pulling, above all the angled edge of the beginning of the cliché into the slot (11). It is expedient that the holding magnets (14, 15) are arranged so deep in the slot (11) that the end of the angled edge of the cliché comes to rest in the area of these holding magnets (14, 15) and does not protrude beyond them.
  • the cliché around the base body is opposite to the direction of the arrow (A) laid around.
  • the holding magnet (16) which is assigned to the beginning of the cliché, takes over the cliché.
  • the holding magnets (17) facilitate the attachment and the smooth application of the cliché to the base body (10) of the printing cylinder.
  • the holding magnets (18, 19) take up the end of the cliché, which is thus securely held and is directly adjacent to the slot (11).
  • the two holding magnets (18, 19) assigned to the end of a cliché are arranged in an insert (20) which is inserted into a recess in the base body (10) and which extends over the entire body extends axial length.
  • the insert (20) consists of magnetizable material, in particular steel.
  • the insert (20) forms the side wall of the slot (11) opposite the bar (12). This initially has the advantage that both outer edges of the slot (11) consist of a relatively solid material, in particular steel, so that they are largely protected against mechanical damage.
  • the insert (20) allows a better distribution of the magnetic lines of the holding magnets (18, 19), so that it is possible to bring the end of the cliché practically right up to the slot (11) and still hold it there.
  • the holding magnet (16) is inserted and glued in a U-shaped insert (21) made of magnetizable material, which in turn is inserted into the base body (10).
  • a steel U-profile with a thickness of the order of 1 mm to 2 mm can be used for this purpose, for example, which is folded from sheet metal.
  • Such inserts made of magnetizable material are also useful for the holding magnets (16, 17, 18 and 19) of the embodiment according to FIGS. 1 and 2.
  • Such operations can of course be dispensed with if the Base body (10) is made of magnetizable material, in particular as a steel tube.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
EP97100158A 1996-01-26 1997-01-08 Cylindre porte-cliché pour un cliché d'une matière de support magnétisable Withdrawn EP0786340A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19602746A DE19602746A1 (de) 1996-01-26 1996-01-26 Druckzylinder für ein Klischee aus magnetisierbarem Trägermaterial
DE19602746 1996-01-26

Publications (2)

Publication Number Publication Date
EP0786340A2 true EP0786340A2 (fr) 1997-07-30
EP0786340A3 EP0786340A3 (fr) 1998-01-07

Family

ID=7783730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100158A Withdrawn EP0786340A3 (fr) 1996-01-26 1997-01-08 Cylindre porte-cliché pour un cliché d'une matière de support magnétisable

Country Status (3)

Country Link
US (1) US5797323A (fr)
EP (1) EP0786340A3 (fr)
DE (1) DE19602746A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6688227B2 (en) 2002-04-01 2004-02-10 Presstek, Inc. Magnetic plate-retention system and method of securing recording medium to rotatable support
US11230127B2 (en) * 2002-07-15 2022-01-25 Viavi Solutions Inc. Method and apparatus for orienting magnetic flakes
DE10236855B4 (de) * 2002-08-07 2006-03-16 Samsung SDI Co., Ltd., Suwon Gehäuseeinheit zur Verkapselung von Bauelementen und Verfahren zu deren Herstellung
US20050120898A1 (en) * 2003-12-05 2005-06-09 Presstek, Inc. Magnetic plate retention
US7565856B2 (en) * 2005-07-01 2009-07-28 Eagle Rotary Systems, Inc. Rotary cutting tool
DE102005045756A1 (de) * 2005-09-23 2007-03-29 Polywest Kunststofftechnik Saueressig & Partner Gmbh & Co. Kg Druckform-Trägerhülse und Verfahren zu deren Herstellung
DE102006006331B3 (de) * 2006-02-11 2007-02-22 Koenig & Bauer Ag Vorrichtung zum Befestigen eines Aufzugs auf einem Zylinder
EP2253471A1 (fr) * 2009-05-18 2010-11-24 Müller Martini Holding AG Cylindre de pression doté d'un tissu en caoutchouc pour une presse rotative offset à rouleaux
JP6243576B2 (ja) * 2015-04-21 2017-12-06 株式会社シンク・ラボラトリー 機能性シリンダ体及びその製造方法
PL435225A1 (pl) * 2020-09-08 2022-03-14 Rotometal Spółka Z Ograniczoną Odpowiedzialnością Cylinder magnetyczny zwłaszcza dla urządzenia do poligrafii oraz sposób wytwarzania cylindra magnetycznego

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721189A (en) * 1971-06-28 1973-03-20 Magna Graphics Corp Magnetic print cylinder
DK127277C (fr) * 1972-03-06
DE2708738A1 (de) * 1977-03-01 1978-09-07 Thyssen Edelstahlwerke Ag Magnetischer druckzylinder
US4402265A (en) * 1978-11-16 1983-09-06 Beach Manufacturing Corporation Magnetic printing saddle
GB2165489A (en) * 1984-09-26 1986-04-16 Auto Masters Ltd Mounting printing plates
DE3614541A1 (de) * 1986-04-29 1987-11-05 Roland Man Druckmasch Vorrichtung zum festhalten von zwischenlagen an zylindern von rotationsdruckmaschinen
DE3626243A1 (de) * 1986-08-02 1988-02-04 Koenig & Bauer Ag Druckplattenbefestigungs- und spannvorrichtung
US5357863A (en) * 1991-11-15 1994-10-25 Day International, Inc. Printing blanket for use with a printing cylinder to achieve a narrow gap lock-up
US5627505A (en) * 1996-07-01 1997-05-06 T. D. Wright, Inc. Magnetic cylinder with axial extending permanent bar magnets

Also Published As

Publication number Publication date
DE19602746A1 (de) 1997-07-31
EP0786340A3 (fr) 1998-01-07
US5797323A (en) 1998-08-25

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