EP0986469A1 - Verfahren zum betrieb eines gravierorgans - Google Patents
Verfahren zum betrieb eines gravierorgansInfo
- Publication number
- EP0986469A1 EP0986469A1 EP98934806A EP98934806A EP0986469A1 EP 0986469 A1 EP0986469 A1 EP 0986469A1 EP 98934806 A EP98934806 A EP 98934806A EP 98934806 A EP98934806 A EP 98934806A EP 0986469 A1 EP0986469 A1 EP 0986469A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engraving
- signal
- during
- frequency
- interruption
- 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
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
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/045—Mechanical engraving heads
Definitions
- the invention relates to the field of electronic reproduction technology and relates to a method for operating an engraving member in an electronic engraving machine for engraving printing forms, in particular printing cylinders, for gravure printing.
- an electromagnetic engraving element with an engraving stylus as a cutting tool moves in the axial direction along a rotating printing cylinder.
- the engraving stylus which is controlled by an engraving signal, cuts a sequence of recesses, called cups, arranged in a grid into the outer surface of the printing cylinder.
- the engraving signal is formed by superimposing an image signal representing the tonal values between "black” and "white” with a periodic raster signal. While the raster signal causes the engraving stylus to vibrate in order to generate the raster, the image signal controls the depths of the cells engraved in the lateral surface of the printing cylinder in accordance with the tonal values to be reproduced.
- the drive system for the engraving stylus essentially consists of a stationary electromagnet to which the engraving signal is applied, in the air gap of which the armature of a rotating system moves.
- the rotating system has an armature axis, an axle bearing and a damping device.
- One end of the anchor axis is designed as a resilient torsion bar that is clamped in place, while the other end carries a lever-like stylus holder for the engraving stylus.
- the engraving signal generates an alternating magnetic field in the electromagnet, which exerts alternating electrical torques on the armature, which counteracts the mechanical torque of the torsion bar.
- the changing electrical torques cause the armature axis to vibrate out of the rest position defined by the torsion bar by angles which are proportional to the amplitudes of the engraving signal.
- the stylus holder with the engraving stylus executes lifting movements directed at the lateral surface of the printing cylinder, which determine the depths of penetration of the engraving stylus into the lateral surface of the printing cylinder.
- the alternating magnetic field in the electromagnet generates alternating current losses in the armature which are dependent on the frequency of the raster signal.
- the alternating current losses slowly heat the armature, the armature axis and the stylus holder with the engraving stylus from an initial temperature when the engraving starts to a stable operating temperature during the engraving.
- the heating causes an expansion of the armature axis and the stylus holder as well as a change in the magnetic permeability of the pole shoe of the electromagnet and the armature.
- the temperature changes between the initial temperature at the start of engraving and the stable operating temperature and during interruptions in engraving are so small that the expansion and permeability changes caused by the heating do not adversely affect the quality of the engraved cells.
- the object of the present invention is therefore to improve a method for operating an engraving member in an electronic engraving machine for engraving printing forms, in particular printing cylinders, for gravure printing in such a way that disturbing temperature changes are avoided, in order thereby to achieve good engraving quality.
- a printing cylinder (1) is driven in rotation by a rotary drive (2).
- An engraving member (4) mounted on an engraving carriage (3) with an engraving stylus as a cutting tool moves in the axial direction along the rotating printing cylinder (1) with the aid of a spindle (6) driven by a feed drive (5).
- the engraving element (4) is an electromagnetic engraving element with an electromagnetic drive system for the engraving stylus.
- An electromagnetic drive system has already been explained in detail in the introduction to the description and is known, for example, from DE 23 36 089 A.
- the drive system for the engraving stylus can also be designed as a solid-state actuator element made of an electostrictive, piezocrystalline or a magnetostrictive material.
- the engraving stylus of the engraving member (4) which is controlled by an engraving signal (G) on a line (7), cuts a series of engraved lines into the surface of the rotating printing cylinder (1), while the engraving member (4) gradually moves moved axially along the pressure cylinder (1).
- the engraving signal (G) is superimposed on a periodic raster signal (R), also called vibration, with analog image values (B) which represent the tonal values of the cells to be engraved between "black” and “white” , formed in an overlay stage (9).
- a raster generator (10) provides the periodic raster signal (R), the frequency of which can be switched by a control signal (S).
- the control signal (S) is generated in a sequence control (11) and fed to the raster generator (10) via a line (12).
- the analog image values (B) determine the depths of penetration of the engraving stylus into the outer surface of the printing cylinder (1) in accordance with the tonal values to be engraved.
- the engraving data (GD) engraving line for engraving line are stored in an engraving data memory (13) in the order required for the engraving of the printing cylinder (1).
- Each well to be engraved is assigned an engraving date of at least one byte, which contains, among other things, the engraving information of the tonal value to be engraved between "black” and "white”.
- the engraving data (GD) are obtained, for example, by point-by-line and line-by-line, optoelectronic scanning of a template to be reproduced in a scanner and then stored in the engraving data memory (13).
- the engraving data (GD) are read out of the engraving data memory (13) by means of a reading clock sequence T s and converted into the analog image values (B) in an A / D converter (14) Engraving amplifiers (8) are fed via a line (15).
- the reading clock sequence T s is also generated in the sequence control (11) and reaches the engraving data memory (13) via a line (16).
- the sequence control (11) is synchronized with the rotary movement of the printing cylinder (1), in that a pulse generator (17) mechanically coupled to the rotary drive (2) supplies a synchronous signal to the sequence control (11) via a line (18).
- the engraving member (4) can be heated by applying the periodic raster signal present before the start of engraving and / or during the interruptions in engraving. Since the engraving frequency is in practice in the listening area and the rotating system of the engraving member (4) oscillates with the engraving frequency, noise can occur.
- the noise pollution can be considerably reduced if the engraving element (4) is subjected to a periodic signal for heating before the start of engraving and / or during the interruptions in engraving, the frequency of which is greater than the engraving frequency and such that the rotating system only still vibrates with a small amplitude, ie due to its mass no longer follows the frequency of the periodic signal. Nevertheless, disturbing noises can still occur due to elastic deformations of parts of the drive system.
- a periodic signal the frequency of which is in the ultrasound range, for example 20 kHz, is therefore advantageously used to heat the engraving member (4).
- the rotary system vibrates with such a small amplitude that the noise emission is advantageously greatly reduced and is no longer audible.
- the periodic signal with ultrasound frequency ensures the required heating of the armature and the armature axis of the engraving member (4) to the operating temperature through the eddy current losses occurring in the armature.
- the heating of the engraving element (4) before the start of engraving and / or during engraving pauses requires a significantly lower electrical output than that is needed for the engraving.
- the raster signal generated in the raster generator (10) can be used as the periodic signal, the frequency of which is controlled by the control signal (S) from the engraving frequency during engraving to the higher frequency, preferably to the ultrasound frequency, before the start of engraving and / or is switched during the engraving breaks.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19723184A DE19723184B4 (de) | 1997-06-03 | 1997-06-03 | Verfahren zum Betrieb eines Gravierorgans |
DE19723184 | 1997-06-03 | ||
PCT/DE1998/001445 WO1998055305A1 (de) | 1997-06-03 | 1998-05-27 | Verfahren zum betrieb eines gravierorgans |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0986469A1 true EP0986469A1 (de) | 2000-03-22 |
EP0986469B1 EP0986469B1 (de) | 2001-12-19 |
Family
ID=7831240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98934806A Expired - Lifetime EP0986469B1 (de) | 1997-06-03 | 1998-05-27 | Verfahren zum betrieb eines gravierorgans |
Country Status (7)
Country | Link |
---|---|
US (1) | US6741369B1 (de) |
EP (1) | EP0986469B1 (de) |
JP (1) | JP3149193B2 (de) |
CN (1) | CN1261307A (de) |
DE (2) | DE19723184B4 (de) |
ES (1) | ES2167917T3 (de) |
WO (1) | WO1998055305A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007045015A1 (de) * | 2007-09-20 | 2009-04-02 | Giesecke & Devrient Gmbh | Vorrichtung und Verfahren zur Erzeugung von Mehrnutzen-Stichtiefdruckplatten |
AU2008100847A4 (en) * | 2007-10-12 | 2008-10-09 | Bluescope Steel Limited | Method of forming textured casting rolls with diamond engraving |
FR2986737B1 (fr) * | 2012-02-14 | 2014-02-21 | Cyllab | Processus de gravure electromecanique haute definition de cylindres pour le procede d'impression heliogravure |
CN103832049B (zh) * | 2014-01-28 | 2015-09-23 | 太仓丽盛制版有限公司 | 凹版制版中二次补充雕刻方法 |
CN105479923A (zh) * | 2014-09-16 | 2016-04-13 | 上海运青制版有限公司 | 一种版辊补雕刻方法 |
CN105946337B (zh) * | 2016-06-24 | 2018-04-20 | 无锡欧诺锁业有限公司 | 一种凹版滚筒的表面图形雕刻装置 |
CN112497892B (zh) * | 2020-12-15 | 2024-02-02 | 固高科技股份有限公司 | 伺服驱动装置及系统 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7511479U (de) * | 1975-09-18 | Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel | Anordnung zum Gravieren von Druckformen in einer Druckform-Graviermaschine | |
US2773163A (en) * | 1953-09-28 | 1956-12-04 | Fairchild Camera Instr Co | Heatable engraving stylus assembly |
US4004924A (en) * | 1965-05-17 | 1977-01-25 | Agfa-Gevaert N.V. | Thermorecording |
DE2132892A1 (de) * | 1971-07-02 | 1973-01-18 | Koerting Kiefel Vertriebs Gmbh | Verfahren und vorrichtung zum praegen und austrennen von kunststoffteilen |
US4095633A (en) * | 1977-01-10 | 1978-06-20 | Kimball Jerome W | Woodcarver and engraver machine |
US4297060A (en) * | 1979-11-01 | 1981-10-27 | Ross Byron W | Engraving machine |
FR2520295B1 (fr) * | 1982-01-26 | 1986-05-09 | Herve Fils Sa | Perfectionnements aux rotatives d'impression d'un support mince defilant de facon continue |
DE4130055A1 (de) * | 1991-09-10 | 1993-03-11 | Josef Hobelsberger | Verfahren zum anbringen von gravuren auf eine oberflaeche eines eiskoerpers, insbesondere eines solchen aus klareis, sowie eiskoerper mit gravur |
US5424845A (en) * | 1993-02-25 | 1995-06-13 | Ohio Electronic Engravers, Inc. | Apparatus and method for engraving a gravure printing cylinder |
US5491559A (en) * | 1994-11-04 | 1996-02-13 | Ohio Electronic Engravers, Inc. | Method and apparatus for engraving using a magnetostrictive actuator |
JP3386707B2 (ja) * | 1998-01-28 | 2003-03-17 | 富士機械工業株式会社 | グラビア印刷装置の集中制御処理システム |
DE19952996A1 (de) * | 1999-11-04 | 2001-05-10 | Heidelberger Druckmasch Ag | Gravierorgan für elektronische Graviermaschine |
US6523467B2 (en) * | 1999-12-17 | 2003-02-25 | Heidelberger Druckmaschinen Aktiengesellschaft | Method for measuring engraving cups |
DE50100265D1 (de) * | 2000-03-23 | 2003-07-03 | Basf Drucksysteme Gmbh | Verwendung von Pfropfcopolymeren zur Herstellung lasergravierbarer Reliefdruckelementen |
US20040007143A1 (en) * | 2002-07-09 | 2004-01-15 | Baxter Brent Alan | Custom rubber stamp member creating process |
-
1997
- 1997-06-03 DE DE19723184A patent/DE19723184B4/de not_active Expired - Fee Related
-
1998
- 1998-05-27 JP JP50126999A patent/JP3149193B2/ja not_active Expired - Fee Related
- 1998-05-27 EP EP98934806A patent/EP0986469B1/de not_active Expired - Lifetime
- 1998-05-27 US US09/445,121 patent/US6741369B1/en not_active Expired - Fee Related
- 1998-05-27 DE DE59802547T patent/DE59802547D1/de not_active Expired - Fee Related
- 1998-05-27 ES ES98934806T patent/ES2167917T3/es not_active Expired - Lifetime
- 1998-05-27 CN CN98805316A patent/CN1261307A/zh active Pending
- 1998-05-27 WO PCT/DE1998/001445 patent/WO1998055305A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9855305A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0986469B1 (de) | 2001-12-19 |
DE59802547D1 (de) | 2002-01-31 |
DE19723184B4 (de) | 2006-01-12 |
JP2000512941A (ja) | 2000-10-03 |
WO1998055305A1 (de) | 1998-12-10 |
ES2167917T3 (es) | 2002-05-16 |
US6741369B1 (en) | 2004-05-25 |
JP3149193B2 (ja) | 2001-03-26 |
CN1261307A (zh) | 2000-07-26 |
DE19723184A1 (de) | 1998-12-10 |
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