EP1454743A2 - Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter - Google Patents
Vorrichtung zur Fokuseinstellung der Belichtungsköpfe in einem Druckplattenbelichter Download PDFInfo
- Publication number
- EP1454743A2 EP1454743A2 EP03022703A EP03022703A EP1454743A2 EP 1454743 A2 EP1454743 A2 EP 1454743A2 EP 03022703 A EP03022703 A EP 03022703A EP 03022703 A EP03022703 A EP 03022703A EP 1454743 A2 EP1454743 A2 EP 1454743A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- exposure
- plate
- drum
- 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.)
- Granted
Links
- 238000007639 printing Methods 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 7
- 239000000976 ink Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Images
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 a device for adjusting the focus of the exposure heads in an imagesetter for recording artwork on printing plates.
- print templates are created for printed pages that contain all elements to be printed such as texts, graphics and images.
- a separate print template is created for each printing ink contains all elements that are printed in the respective color.
- the printing inks cyan, magenta, yellow and black (CMYK).
- CMLK magenta, yellow and black
- the printing templates separated according to printing inks are also called color separations.
- the artwork is usually rasterized and with an imagesetter exposed on films, with which printing plates for printing large runs getting produced. Alternatively, the artwork can be used in special exposure devices can also be exposed immediately on printing plates or they will be directly transferred as digital data to a digital printing machine. There will be the print template data then, for example, with one integrated into the printing press Exposure unit exposed on printing plates before immediately afterwards the print run begins.
- the print templates are electronic reproduced. Images are scanned in a color scanner and in shape of digital data stored. Texts are created using word processing programs generates and graphics with drawing programs. With a layout program the image, text and graphic elements are put together on a printed page. The data of several printed pages are combined with the data of other elements, such as registration marks, cut marks and fold marks as well as print control fields Printing templates for a printed sheet summarized. As data formats for Description of the print templates today are largely the page description languages Postscript and PDF (Portable Document Format) are used. The Postscript or PDF data are saved in converted into a rasterized CMYK color separation using a raster image processor (RIP).
- RIP raster image processor
- a laser beam from a laser diode generated shaped by optical means and focused on the recording material and by means of a deflection system point and line-wise over the recording material distracted.
- recording devices that are used to increase the exposure speed one or more bundles of laser beams generate, e.g. with one or more laser diode arrays, and with each sweep of the recording material several image lines of the printing form at the same time expose.
- the recording material can be on a drum (Outer drum imagesetter), in a cylindrical trough (inner drum imagesetter) or on a flat surface (flatbed imagesetter).
- the material to be exposed is in the form of films or printing plates a rotatably mounted drum.
- a Exposure head axially along the drum at a relatively short distance emotional.
- the exposure head focuses one or more laser beams on the Drum surface, which is the drum surface in the form of a narrow helix sweep.
- the depth of field of a laser beam in an outer drum imagesetter for Printing plates is approximately 0.1 mm. Because the printing plates have different plate thicknesses can have, approximately in the range of 0.1 to 0.3 mm, is a device with which the focus of the laser beams matches the thickness of the printing plates can be adjusted.
- Known devices with which the optical Image of the laser beams is adjusted or with which the exposure head, which generates the laser beams, radially towards or from the exposure drum moved away, are structurally complex and associated with high costs. This is especially true if the printing plate with a lot of laser beams or with multiple exposure heads to be exposed at the same time.
- the object is achieved by a device with which a Exposure head carrier, on which several exposure heads can be arranged and with which the exposure heads together axially on the exposure drum are moved along, performs a tilting movement. Through the tilting movement all exposure heads are radial by the same amount at once moved towards or away from the exposure drum.
- Fig. 1 shows the basic structure of an outer drum imagesetter.
- An imaging drum 1 is rotatably supported and can be operated with a rotary drive, not shown in the direction of the arrow 2 in a uniform rotation be transferred.
- On the exposure drum 1 is an unexposed, rectangular pressure plate 3 stretched.
- the pressure plate 3 is stretched so that their front edge touches 4 contact pins 8, which is fixed with the exposure drum 1 are connected and protrude beyond the surface of the exposure drum 1.
- a terminal strip 9 also presses the front edge 4 firmly onto the surface the exposure drum 1 and thereby fixes the front edge 4 of the printing plate 3.
- the printing plate 3 is made flat by means of a vacuum device, not shown in FIG.
- An exposure head 11 or several exposure heads 11, which are on one common exposure head carrier 16 are arranged in a relative short distance axially along the exposure drum 1 while the Exposure drum 1 rotates.
- Each exposure head 11 focuses one or multiple laser beams 12 onto the drum surface that cover the drum surface paint in the form of narrow helical lines. That way, at each drum revolution one or more groups of image lines in the circumferential direction x exposed on the recording material.
- the exposure head carrier 16 is moved in the feed direction y by means of a feed spindle 13, with which it is positively connected and with a feed drive 14 in Rotational movement is offset.
- Fig. 1 shows as an example an imagesetter with two exposure heads 11 which are in the axial direction are arranged at a distance A and each have a bundle of laser beams 12 focus the pressure plate 3.
- the print template 15 is thereby simultaneously with two groups of helixes exposed at axial distance A the drum surface sweep.
- the exposure head carrier 16 consists of two parts, a carrier plate 20 on which the exposure heads 11 are mounted, and a support base 21 which runs on guide rails 22 and by means of the feed spindle 13 together with the carrier plate 20 in the y direction is moved axially along the exposure drum 1.
- the carrier plate 20 and the carrier base 21 are on the side facing the exposure drum 1 connected by a hinge 23, the axis of rotation of which extends in the y direction.
- the hinge 23 allows the support plate 20 to tilt the axis of rotation of the hinge 23, whereby those mounted on the support plate 20 Exposure heads 11 in the direction of arrow 24 towards the exposure drum 1 or be moved away from the exposure drum 1.
- the tilting movement of the Carrier plate 20 is designed, for example, with a drive that drives the rear, the back of the carrier plate 20 facing away from the exposure drum 1 in the direction of arrow 25 raises or lowers.
- the focus of the laser beams becomes due to the tilting movement 12 for all exposure heads 11 together before the start of exposure optimally adjusted to the respective thickness of the printing plate 3 to be exposed.
- Fig. 2 shows a preferred embodiment for the drive.
- a Eccentric shaft 26 is connected to the rear of the carrier plate 20 via support arms 27.
- the eccentric shaft 26 is rotatably supported in the support arms 27.
- the eccentric shaft 26 has an eccentrically arranged pin at both ends 28, each of which carries a roller 29 which rolls on the carrier base 21.
- 3a and 3b show this in an enlarged view for one end of the eccentric shaft. If the eccentric shaft 26 is rotated through a certain angle, it will raised or lowered by the eccentric pin 28. With that the Support arms 27 raised or lowered, whereby the support plate 20 about the axis of the hinge 23 is tilted.
- 3a shows the eccentric shaft 26 in its lowest Position
- Fig. 3b shows it in its highest position.
- the height difference H is dimensioned such that the exposure heads 11 are taken into account the lever lengths on both sides of the axis of hinge 23 in one sufficient large area can be adjusted radially to the exposure drum 1.
- the rotary drive for the eccentric shaft 26 takes place, for example, with a stepper motor 30 via a toothed belt 31 (Fig. 2).
- the eccentric shaft is expedient 26 also with a device for determination, not shown in FIG. 2 a zero angular position of the eccentric shaft 26 connected, for example from a with a slotted disc and a light barrier can.
- the zero angle detector can be adjusted so that the exposure heads 11 at the zero angular position of the eccentric shaft 26 in a central position of the radial delivery area.
- the required radial infeed range is for example 0.5 mm, and the delivery of the exposure heads 11 must be reproducible done in very small steps.
- the exposure heads 11 By rotating the eccentric shaft 26 around a certain number of clock steps of the stepper motor 30 are then depending the direction of rotation the exposure heads 11 by a precisely defined distance the exposure drum 1 moves to or away from it.
- the required number of Clock steps can be calculated from the lever ratios of the tilt drive beforehand become.
- the radial infeed depending on the number of Clock steps are measured once and in a table memory of the imagesetter are stored from where they will later be used as setting values when operating the imagesetter to provide. This is all mechanical at the same time Tolerances of the tilt drive are also recorded and taken into account. Because of the tilting movement The exposure heads 11 move about the axis of the hinge 23 not on a straight line radially to the exposure drum 1 but on one Arc piece.
- Fig. 4 shows an alternative embodiment for a tilt drive.
- a stepper motor 40 is mounted, which rotatably drives a pull spindle 41.
- a nut segment 42 engages in the tension spindle 41 in a form-fitting manner, so that the nut segment 42 horizontally back and forth when turning the feed screw 41 can be moved.
- a roller 43 is attached to the nut segment 42 during the horizontal movement of the nut segment 42 on the support base 21 rolls.
- a rocker arm 44 is rotatably attached to the nut segment 42, the other end of which is rotatably connected to the rear of the carrier plate 20 is. The length of the rocker arm 44 is such that the horizontal Movement of the nut segment 42 in a vertical movement of the back of the Carrier plate 20 is implemented.
- Fig. 5 shows a preferred embodiment for the hinge 23 in an enlarged Cross-sectional view of the end face of the exposure head carrier 16.
- the carrier plate 20 and the carrier base 21 are on the exposure drum 1 facing side separated by a narrow gap 50.
- a spring plate 51 placed on the support plate 20 and on the support base 21 is firmly clamped by means of two clamping rails 52 and screws. at the tilting movement of the support plate 20 in the direction of arrow 53 becomes the spring plate 51 bent in the gap 50.
- the spring plate 51 consists of an elastic Material, preferably spring steel. Because the tilt angle is only a fraction of one Degrees, the bending stress is very low.
- the spring plate 51 can be designed so that it extends over the entire axial length of the exposure head carrier 16 extends.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Facsimile Scanning Arrangements (AREA)
- Fax Reproducing Arrangements (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Facsimile Heads (AREA)
Abstract
Description
- Fig. 1
- den Aufbau eines Außentrommelbelichters,
- Fig. 2
- eine Kippvorrichtung für einen Belichtungskopfträger,
- Fig. 3
- einen Kippantrieb mit einer Exzenterwelle,
- Fig. 4
- einen Kippantrieb mit einem Kipphebel, und
- Fig. 5
- ein Scharnier mit einem Federblech.
- 1
- Belichtungstrommel
- 2
- Rotationspfeil
- 3
- Druckplatte
- 4
- Vorderkante
- 7
- Hinterkante
- 8
- Anlagestift
- 9
- Klemmleiste
- 10
- Begrenzungsstück
- 11
- Belichtungskopf
- 12
- Laserstrahl
- 13
- Vorschubspindel
- 14
- Vorschubantrieb
- 15
- Druckvorlage
- 16
- Belichtungskopfträger
- 20
- Trägerplatte
- 21
- Trägerbasis
- 22
- Führungsschiene
- 23
- Scharnier
- 24
- Pfeil
- 25
- Pfeil
- 26
- Exzenterwelle
- 27
- Tragarm
- 28
- Zapfen
- 29
- Rolle
- 30
- Schrittmotor
- 31
- Zahnriemen
- 40
- Schrittmotor
- 41
- Zugspindel
- 42
- Mutternsegment
- 43
- Rolle
- 44
- Kipphebel
- 50
- Spalt
- 51
- Federblech
- 52
- Klemmschiene
- 53
- Pfeil
Claims (6)
- Vorrichtung zur Fokuseinstellung von mindestens einem Belichtungskopf (11) auf ein Aufzeichnungsmaterial, insbesondere eine Druckplatte (3), in einem Belichter zur Aufzeichnung von Druckvorlagen (15), insbesondere einem Außentrommelbelichter mit einer Belichtungstrommel (1) zur Aufnahme der Druckplatte (3)
gekennzeichnet durcheinen Belichtungskopfträger (16), bestehend aus einer Trägerplatte (20) zur Aufnahme der Belichtungsköpfe (11) und einer Trägerbasis (21), undein Scharnier (23), das die Trägerplatte (20) und die Trägerbasis (21) beweglich verbindet. - Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Scharnier (23) an der der Belichtungstrommel (1) zugewandten Vorderseite des Belichtungskopfträgers (16) angeordnet ist.
- Vorrichtung nach Anspruch 1 oder 2, gekennzeichnet durch einen Kippantrieb, mit dem die der Belichtungstrommel (1) abgewandte Rückseite der Trägerplatte (20) gehoben oder gesenkt wird.
- Vorrichtung nach Anspruch 3, gekennzeichnet durch eine drehbar angetriebene Exzenterwelle (26), die über Tragarme (27) mit der Rückseite der Trägerplatte (20) verbunden ist.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Scharnier (23) aus mindestens einem Federblech (51) gebildet wird.
- Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass mittels der Kippbewegung der Trägerplatte (20) die Belichtungsköpfe (11) gemeinsam im wesentlichen radial auf die Belichtungstrommel (1) zu bewegt oder von der Belichtungstrommel (1) weg bewegt werden.
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 true EP1454743A2 (de) | 2004-09-08 |
EP1454743A3 EP1454743A3 (de) | 2006-07-26 |
EP1454743B1 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 (de) |
EP (1) | EP1454743B1 (de) |
JP (1) | JP4015633B2 (de) |
CN (1) | CN100421933C (de) |
DE (2) | DE10309772A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1997627A1 (de) * | 2007-06-01 | 2008-12-03 | Andromeda S.r.l. | Bebilderungvorrichtung, insbesondere zur Herstellung von lithographischen Druckplatten |
DE102008050928A1 (de) | 2008-10-10 | 2010-04-15 | Heidelberger Druckmaschinen Ag | Verfahren und Vorrichtung zur Vermeidung von Moirées bei Bebilderung von Substraten |
Families Citing this family (4)
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 |
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 |
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 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3004124A1 (de) * | 1979-02-09 | 1980-08-21 | Coulter Systems Corp | Verfahren bzw. einrichtung zur herstellung von lithographieplatten auf elektrophotographischem wege |
EP0164764A2 (de) * | 1979-07-11 | 1985-12-18 | BUECHLER, Lester W. | Vorrichtung und Verfahren zum Gravieren |
EP0996277A2 (de) * | 1998-10-21 | 2000-04-26 | Heidelberger Druckmaschinen Aktiengesellschaft | Vorrichtung zur Einstellung der Position eines zylindrischen Bildträgers in Bezug auf einen Abtastkopf |
US20020011164A1 (en) * | 2000-02-25 | 2002-01-31 | Tice William W. | Pin registration system for mounting different width printing plates |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
JP4202576B2 (ja) * | 2000-03-23 | 2008-12-24 | 富士フイルム株式会社 | 走査露光装置 |
-
2003
- 2003-03-06 DE DE10309772A patent/DE10309772A1/de not_active Ceased
- 2003-10-09 EP EP03022703A patent/EP1454743B1/de not_active Expired - Lifetime
- 2003-10-09 DE DE50311893T patent/DE50311893D1/de not_active Expired - Lifetime
- 2003-12-05 US US10/728,386 patent/US7116346B2/en not_active Expired - Fee Related
-
2004
- 2004-03-03 JP JP2004059471A patent/JP4015633B2/ja not_active Expired - Fee Related
- 2004-03-08 CN CNB2004100286753A patent/CN100421933C/zh not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3004124A1 (de) * | 1979-02-09 | 1980-08-21 | Coulter Systems Corp | Verfahren bzw. einrichtung zur herstellung von lithographieplatten auf elektrophotographischem wege |
EP0164764A2 (de) * | 1979-07-11 | 1985-12-18 | BUECHLER, Lester W. | Vorrichtung und Verfahren zum Gravieren |
EP0996277A2 (de) * | 1998-10-21 | 2000-04-26 | Heidelberger Druckmaschinen Aktiengesellschaft | Vorrichtung zur Einstellung der Position eines zylindrischen Bildträgers in Bezug auf einen Abtastkopf |
US20020011164A1 (en) * | 2000-02-25 | 2002-01-31 | Tice William W. | Pin registration system for mounting different width printing plates |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1997627A1 (de) * | 2007-06-01 | 2008-12-03 | Andromeda S.r.l. | Bebilderungvorrichtung, insbesondere zur Herstellung von lithographischen Druckplatten |
DE102008050928A1 (de) | 2008-10-10 | 2010-04-15 | Heidelberger Druckmaschinen Ag | Verfahren und Vorrichtung zur Vermeidung von Moirées bei Bebilderung von Substraten |
Also Published As
Publication number | Publication date |
---|---|
JP2004274749A (ja) | 2004-09-30 |
DE50311893D1 (de) | 2009-10-22 |
EP1454743A3 (de) | 2006-07-26 |
JP4015633B2 (ja) | 2007-11-28 |
US20040207711A1 (en) | 2004-10-21 |
CN1526548A (zh) | 2004-09-08 |
CN100421933C (zh) | 2008-10-01 |
DE10309772A1 (de) | 2004-09-30 |
EP1454743B1 (de) | 2009-09-09 |
US7116346B2 (en) | 2006-10-03 |
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