EP1454743B1 - Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter - Google Patents

Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter Download PDF

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Publication number
EP1454743B1
EP1454743B1 EP03022703A EP03022703A EP1454743B1 EP 1454743 B1 EP1454743 B1 EP 1454743B1 EP 03022703 A EP03022703 A EP 03022703A EP 03022703 A EP03022703 A EP 03022703A EP 1454743 B1 EP1454743 B1 EP 1454743B1
Authority
EP
European Patent Office
Prior art keywords
exposure
drum
plate
carrier
printing
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
EP03022703A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1454743A3 (de
EP1454743A2 (de
Inventor
Ingmar Dirk Nitsch
Stefan Dr. Schmidt
Bernd Lassen
Lars Paulsen
Burkhard Paasch
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 EP1454743A2 publication Critical patent/EP1454743A2/de
Publication of EP1454743A3 publication Critical patent/EP1454743A3/de
Application granted granted Critical
Publication of EP1454743B1 publication Critical patent/EP1454743B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1083—Mechanical aspects of off-press plate preparation

Definitions

  • the invention relates to the field of electronic reproduction technology and relates to an apparatus for adjusting the focus of the exposure heads in an imagesetter for recording artwork on printing plates.
  • print templates are created for printed pages containing all the elements to be printed, such as text, graphics and images.
  • a separate print template is created for each ink, containing all the elements printed in each color.
  • these are the inks cyan, magenta, yellow and black (CMYK).
  • CMLK magenta, yellow and black
  • the printed originals separated by printing inks are also called color separations.
  • the artwork is usually rasterized and exposed to film with a setter, which then produces printing plates for high-volume printing.
  • the print templates can be exposed directly on printing plates in special exposure devices or they are transferred directly as digital data to a digital printing press. There, the print data are then exposed to printing plates, for example, with an integrated into the printing unit exposure unit before immediately after the pad printing begins.
  • the artwork is electronically reproduced. Images are scanned in a color scanner and stored in the form of digital data. Texts are created with word processing programs and graphics with drawing programs. With a layout program the picture, text and graphic elements are put together to a printed page. The data of several printed pages are combined with the data of further elements, such as registration marks, crop marks and folding marks as well as print control fields, to print pattern for a printed sheet. As data formats for describing the print templates are now largely the page description languages Postscript and PDF (Portable Document Format). The Postscript or PDF data are converted before the recording of the artwork in a raster image processor (RIP) in the rasterized color separations CMYK.
  • RIP raster image processor
  • a laser beam is generated by a laser diode, formed by optical means and focused on the recording material and deflected by a deflection system point and line by line over the recording material.
  • recording devices that produce one or more bundles of laser beams to increase the exposure speed, e.g. with one or more laser diode arrays, and with each sweep of the recording material, several image lines of the printing plate simultaneously expose.
  • the recording material may be on a drum (external drum imagesetter), in a cylindrical trough (internal drum imagesetter) or on a flat surface (flatbed imagesetter).
  • the material to be exposed is mounted in the form of films or printing plates on a rotatably mounted drum.
  • an exposure head is moved axially along the drum at a relatively short distance.
  • the exposure head focuses one or more laser beams onto the drum surface which sweep the drum surface in the form of a narrow helical line.
  • the depth of field of a laser beam in an external drum platesetter for printing plates is about 0.1 mm. Since the printing plates can have different plate thicknesses, such as in the range of 0.1 to 0.3 mm, a device is required with which the focus of the laser beams can be adjusted to the thickness of the printing plates suitable.
  • the EP-A-0996277 discloses an apparatus for focusing adjustment of a plurality of exposure heads on a recording material in an imagesetter for recording masters according to claim 1, comprising an exposure drum for receiving the exposure material and an exposure head carrier comprising a wafer plate for receiving the exposure heads and a support base.
  • a device for adjusting the position of a printing forme cylinder of a printing machine with respect to a scanning head is proposed.
  • the positioning is achieved by a pivoting movement of the plate cylinder reached around an axis which is perpendicular to its longitudinal axis.
  • the device is a solution when used inside a printing press since the printing forme cylinder is pivotally mounted for skew registration anyway and this device can be shared for positioning relative to the scanning head.
  • an engraving head is described in an engraving machine for gravure cylinder, which is movably mounted on a leaf spring.
  • For engraving the engraving head by means of a tilting movement to the gravure cylinder is adjustable and pivoted away.
  • the object is achieved by a device according to claim 1.
  • Fig. 1 shows the basic structure of an external drum imagesetter.
  • An exposure drum 1 is rotatably mounted and can be offset with a rotary drive not shown in the direction of the rotation arrow 2 in a uniform rotational movement.
  • On the exposure drum 1 an unexposed, rectangular printing plate 3 is stretched.
  • the pressure plate 3 is clamped so that its front edge 4 contact pins 8, which are firmly connected to the exposure drum 1 and project beyond the surface of the exposure drum 1.
  • a clamping strip 9 also presses the front edge 4 firmly on the surface of the exposure drum 1 and thereby fixes the front edge 4 of the printing plate 3.
  • the printing plate 3 is flat by means of a in Fig.
  • a plurality of exposure heads 11 arranged on a common exposure head carrier 16 are moved axially along the exposure drum 1 at a relatively short distance while the exposure drum 1 rotates.
  • Each exposure head 11 focuses one or more laser beams 12 onto the drum surface which sweep the drum surface in the form of tight helical lines. In this way, one or more groups of image lines in the circumferential direction x are exposed to the recording material every drum revolution.
  • the exposure head carrier 16 is moved in the feed direction y by means of a feed screw 13 with which it is positively connected and which is set in rotary motion by a feed drive 14.
  • Fig. 1 shows as an example an imagesetter with two exposure heads 11, which are arranged in the axial direction at a distance A and each focus a bundle of laser beams 12 on the printing plate 3.
  • the printing original 15 is thereby exposed simultaneously with two groups of helical lines, which cover the drum surface at an axial distance A.
  • Fig. 2 shows the inventive device for focus adjustment of the exposure heads 11 in a perspective view.
  • the exposure head support 16 consists of two parts, a support plate 20, on which the exposure heads 11 are mounted, and a support base 21, which runs on guide rails 22 and axially along the exposure drum 1 along the support plate 20 along with the support plate 20 in the y-direction is moved.
  • the support plate 20 and the support base 21 are connected to the exposure drum 1 side facing by a hinge 23, the axis of rotation extends in the y direction.
  • the hinge 23 allows a tilting movement of the support plate 20 to the rotation axis of the hinge 23, whereby the exposure heads 11 mounted on the support plate 20 are moved in the direction of the arrow 24 toward the exposure drum 1 to and from the exposure drum 1, respectively.
  • the tilting movement of the support plate 20 is carried out, for example, with a drive which raises or lowers the rear, the exposure drum 1 facing away from the back of the support plate 20 in the direction of the arrow 25.
  • the focus of the laser beams 12 for all the exposure heads 11 is adjusted optimally to the respective thickness of the printing plate 3 to be exposed before the beginning of the exposure.
  • FIG. 2 shows a preferred embodiment for the drive.
  • An eccentric shaft 26 is connected via support arms 27 with the back of the support plate 20.
  • the eccentric shaft 26 is rotatably mounted in the support arms 27.
  • the eccentric shaft 26 has at both ends depending on an eccentrically arranged pin 28, each carrying a roller 29 which rolls on the support base 21.
  • Fig. 3a and Fig. 3b show this for an end of the eccentric shaft in an enlarged view.
  • FIG. 3a shows the eccentric shaft 26 in its lowest position
  • Fig. 3b shows her in her highest position.
  • the height difference H is so dimensioned that the exposure heads 11, taking into account the lever lengths on both sides of the axis of the hinge 23, can be adjusted radially to the exposure drum 1 in a sufficiently large area.
  • the rotary drive for the eccentric shaft 26 takes place, for example, with a stepper motor 30 via a toothed belt 31 (FIG. Fig. 2 ).
  • the eccentric shaft 26 is still with a in Fig. 2 not shown means for determining a zero-angle position of the eccentric shaft 26 connected, which may for example consist of a slot provided with a slot and a light barrier.
  • the zero-angle detector can be adjusted so that the exposure heads 11 are in the zero-angular position of the eccentric shaft 26 in a middle position of the radial feed area.
  • the required radial delivery area is For example, 0.5 mm, and the delivery of the exposure heads 11 must be reproducibly done in very small steps.
  • the exposure heads 11 are then moved to and from the exposure drum 1 by an accurately defined distance, depending on the direction of rotation.
  • the required number of clock steps can be calculated beforehand from the lever ratios of the tilt drive.
  • the radial feed can be measured once depending on the number of clock steps and stored in a table memory of the imagesetter, from where they are later provided as setting values during operation of the imagesetter.
  • all mechanical tolerances of the tilting drive are detected and taken into account. Because of the tilting movement about the axis of the hinge 23, the exposure heads 11 do not move on a straight line radially to the exposure drum 1 but on a circular arc piece.
  • the points at which the laser beams 12 strike the printing plate 3 shift somewhat in the circumferential direction of the exposure drum 1.
  • this displacement can be compensated for by a corresponding shift in the timings at which the exposure of the image lines begins possible radial delivery of the exposure heads 11, the exposure of the artwork always begins at the same distance from the front edge 4 of the printing plate 3.
  • Fig. 4 shows an alternative embodiment for a tilting drive.
  • a stepper motor 40 which rotatably drives a pull spindle 41.
  • a nut segment 42 engages positively, so that the nut segment 42 can be reciprocated horizontally when rotating the tensioning spindle 41.
  • a roller 43 is fixed, which rolls on the carrier base 21 during the horizontal movement of the nut segment 42.
  • a rocker arm 44 is rotatably mounted on the nut segment 42, the other end is rotatably connected to the back of the support plate 20. The length of the rocker arm 44 is dimensioned such that the horizontal movement of the nut segment 42 is converted into a vertical movement of the rear side of the support plate 20.
  • Fig. 5 shows a preferred embodiment of the hinge 23 in an enlarged cross-sectional view of the end face of the exposure head carrier 16.
  • the support plate 20 and the support base 21 are separated at its the exposure drum 1 side facing by a narrow gap 50.
  • a spring plate 51 is placed, which is firmly clamped to the support plate 20 and the support base 21 by means of two clamping rails 52 and screws.
  • the spring plate 51 is bent in the gap 50.
  • the spring plate 51 is made of an elastic material, preferably spring steel. Since the tilt angle is only a fraction of a degree, the bending stress is very low.
  • the spring plate 51 can be designed to extend over the entire axial length of the exposure head carrier 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Facsimile Heads (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP03022703A 2003-03-06 2003-10-09 Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter Expired - Lifetime EP1454743B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10309772A DE10309772A1 (de) 2003-03-06 2003-03-06 Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter
DE10309772 2003-03-06

Publications (3)

Publication Number Publication Date
EP1454743A2 EP1454743A2 (de) 2004-09-08
EP1454743A3 EP1454743A3 (de) 2006-07-26
EP1454743B1 true EP1454743B1 (de) 2009-09-09

Family

ID=32797837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03022703A Expired - Lifetime EP1454743B1 (de) 2003-03-06 2003-10-09 Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter

Country Status (5)

Country Link
US (1) US7116346B2 (zh)
EP (1) EP1454743B1 (zh)
JP (1) JP4015633B2 (zh)
CN (1) CN100421933C (zh)
DE (2) DE10309772A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102033425A (zh) * 2010-10-26 2011-04-27 中国航天科技集团公司第五研究院第五一○研究所 一种微机械百叶窗的制作方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008250058A (ja) * 2007-03-30 2008-10-16 Dainippon Screen Mfg Co Ltd 画像記録装置
EP1997627A1 (en) * 2007-06-01 2008-12-03 Andromeda S.r.l. Image forming device, in particular for printing litographic plates
DE102008050928A1 (de) 2008-10-10 2010-04-15 Heidelberger Druckmaschinen Ag Verfahren und Vorrichtung zur Vermeidung von Moirées bei Bebilderung von Substraten
US20140233080A1 (en) * 2013-02-15 2014-08-21 Xerox Corporation Multi-Beam ROS Imaging System
CN113634903B (zh) * 2021-06-30 2023-03-14 中钞印制技术研究院有限公司 激光制版设备和制版系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266869A (en) * 1979-02-09 1981-05-12 Coulter Systems Corporation Apparatus and method for making lithographic printing plates
US4357633A (en) * 1979-07-11 1982-11-02 Buechler Lester W Engraving apparatus and method
JPH06270500A (ja) * 1993-03-24 1994-09-27 Pfu Ltd キャリア機構および制御方法
US6042217A (en) * 1997-07-25 2000-03-28 Tektronic, Inc. Print head positioner mechanism
DE19848455A1 (de) * 1998-10-21 2000-04-27 Heidelberger Druckmasch Ag Vorrichtung zur Einstellung der Position eines zylindrischen Bildträgers in Bezug auf einen Abtastkopf
US6604465B2 (en) * 2000-02-25 2003-08-12 Agfa Corporation Pin registration system for mounting different width printing plates
JP4202576B2 (ja) * 2000-03-23 2008-12-24 富士フイルム株式会社 走査露光装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102033425A (zh) * 2010-10-26 2011-04-27 中国航天科技集团公司第五研究院第五一○研究所 一种微机械百叶窗的制作方法
CN102033425B (zh) * 2010-10-26 2012-07-11 中国航天科技集团公司第五研究院第五一○研究所 一种微机械百叶窗的制作方法

Also Published As

Publication number Publication date
DE10309772A1 (de) 2004-09-30
CN1526548A (zh) 2004-09-08
US7116346B2 (en) 2006-10-03
CN100421933C (zh) 2008-10-01
JP4015633B2 (ja) 2007-11-28
EP1454743A3 (de) 2006-07-26
JP2004274749A (ja) 2004-09-30
DE50311893D1 (de) 2009-10-22
US20040207711A1 (en) 2004-10-21
EP1454743A2 (de) 2004-09-08

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