EP0388904B1 - Procédé et dispositif d'ajustage photoélectrique pour le positionnement automatique commandé par ordinateur pour les blocs d'impression d'une presse rotative de sérigraphie - Google Patents

Procédé et dispositif d'ajustage photoélectrique pour le positionnement automatique commandé par ordinateur pour les blocs d'impression d'une presse rotative de sérigraphie Download PDF

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Publication number
EP0388904B1
EP0388904B1 EP90105272A EP90105272A EP0388904B1 EP 0388904 B1 EP0388904 B1 EP 0388904B1 EP 90105272 A EP90105272 A EP 90105272A EP 90105272 A EP90105272 A EP 90105272A EP 0388904 B1 EP0388904 B1 EP 0388904B1
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EP
European Patent Office
Prior art keywords
printing
stencil
optoelectronic
stencils
light
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
EP90105272A
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German (de)
English (en)
Other versions
EP0388904A2 (fr
EP0388904A3 (fr
Inventor
Alexander Lintner
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.)
Stork Brabant BV
Original Assignee
Stork MBK GmbH
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Filing date
Publication date
Application filed by Stork MBK GmbH filed Critical Stork MBK GmbH
Publication of EP0388904A2 publication Critical patent/EP0388904A2/fr
Publication of EP0388904A3 publication Critical patent/EP0388904A3/fr
Application granted granted Critical
Publication of EP0388904B1 publication Critical patent/EP0388904B1/fr
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
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/10—Machines for multicolour printing

Definitions

  • the invention relates to an optoelectronic adjustment method and an adjustment device for automatic, computer-controlled positioning of the printing stencils of a rotary screen printing machine with optoelectronic scanning of printing marks of different configurations attached to the printing stencils, the electrical signal pattern of which is read into a computer which recognizes the printing pattern on the basis of pre-programmed logic and control commands on actuators for axial and rotary adjustment of the respective printing template.
  • this manual method has further disadvantages, especially when using reactive print media, since a visual check of the settings made is not possible at all or only after a subsequent follow-up process (e.g. development).
  • a reflected light measuring system which is capable of recognizing the so-called register marks already attached to each stencil during photographic printing stencil production in connection with a specially developed, microprocessor-controlled scanning method, in order to thereby automatically adjust the printing stencils to enable.
  • this reflection measurement method has a number of problems.
  • the method is heavily dependent on the surface contrast of the respective stencil, which can lead to great difficulties in particular when using different photoresist colors in the stencil production during the later stencil adjustment.
  • the measuring method can only be used to a limited extent with coarsely perforated stencil screens and with stencils with so-called slight engraving errors. A distinction between error signals and measurement signals is only possible to a very limited extent here.
  • the measurement is dependent on the respective measuring distance between the sensor (receiver element) and the template, which means that when using different template diameters, the measuring head must also be adjusted and again adjusted very precisely. Experience has shown that this causes considerable difficulties for the user.
  • the invention is therefore based on the object of providing a method and a device for adjusting the printing stencils of a rotary screen printing machine which, with high operational reliability, enables fully automatic computer-controlled positioning of the printing stencils, regardless of the type of stencil production and its diameter.
  • the invention is characterized in that the optical measuring section of the optoelectronic scanning device is operated with a coherent light source, the light of which passes through the hollow cylinder wall of the respective printing stencil in a translucent area in which the printing marks are also arranged.
  • FIG. 1 shows a printing stencil 1 which is mounted in a printing stencil clamping unit 3 and which is designed as a hollow cylinder in a known manner.
  • the ink tube guided inside the printing stencil 1, the color sensor, the stencil drive wheels arranged at the end and the like are not shown in FIG. 1 for reasons of clarity, also because they are unchanged and known.
  • the printing stencil 1 can be rotated in the X direction (rotation) via a first servomotor 4 (stepper motor) and offset in the Y direction (transverse movement; approximately axial direction) by a second servomotor 5 (stepper motor).
  • the adjustment movements of the printing stencil 1 by the servomotors 4 and 5 are carried out by a position computer 6 (axis computer) via digital driver amplifiers 7 and 8 in accordance with a program sequence stored in a master computer 9 of the overall system.
  • the position computer 6 receives at a control input 10 measurement signals from an opto-electronic measuring section 2, which is essentially formed by a light source 11 arranged outside the printing template 1 and a receiver element 12 fixed inside the printing template 1, the electrical signal pattern of which is provided by the control input 10 of the position computer 6 acted upon.
  • the processing principle for the signals supplied by the optoelectronic measuring section 2 for positioning the printing stencil 1 via the servomotors 4 and 5 is explained further below with reference to FIGS. 4 and 5.
  • FIG. 2 shows a basic cross-sectional illustration of an example for the attachment of the light source 11 or the receiver element 12 of the opto-electronic measuring section 2.
  • the receiver element 12 can be attached to the color level sensor 13 and connected to it at the same time.
  • fixation in the stencil clamping unit 3 takes place in a customary and known manner.
  • This adjustment method can be divided into two sections, which can be referred to as preselection (FIGS. 3 and 5A) or fine adjustment (FIGS. 4 and 5B).
  • FIG. 3 shows the development of the lateral surface of a printing stencil 1, on the edge area (shown enlarged)
  • Print marks 14 distributed over the circumference are arranged according to a certain system. Another marking is the so-called register cross 16, which marks the beginning of the pattern of each printing template 1.
  • a (also greatly enlarged) light point moves as measuring point 15 with simultaneous X and Y feed in a spiral from the outer edge towards the center of the template until the first sensor signal is registered by one of the print marks 14.
  • the Y feed is stopped, while the further X feed (rotation) leads to a sensor pulse sequence that corresponds exactly to the arrangement and sequence of the markings 14 on the printing stencil 1.
  • the registration cross 16 is the last marking in the marking sequence. Due to its different configuration, the registration cross 16 can be recognized by the computer logic as a reference point.
  • the registration cross 16 is measured in the following way: 4, the upper vertical bar of the register cross 16 in the X direction is passed over and the pulse duration of the sensor pulse 17 is brought into a specific ratio to the number of steps of the control pulses 18 of the servomotor during the duration of the sensor pulse 17. The servomotor for the Y direction is then excited in the same way and measurement is carried out accordingly.
  • the sensor pulses determined for the X and Y directions are summed up by calculation and then halved and converted into corresponding motor steps. In this way, the exact center 19 of the register cross 16 can be calculated and automatically adjusted via the X and Y feeds. Is this state is reached, the printing stencil 1 is correctly positioned.
  • the accuracy of the system is not dependent on the size or line width of the register cross or the other markings.
  • FIGS. 5A and 5B clearly illustrate the above-described process for preselection and fine adjustment. Further explanations appear to be unnecessary for the person skilled in the art.
  • the method of preselection can be reprogrammed in software at any time to other marking sequences and forms in a simple manner without changing the optoelectronic measuring sections (sensors) of the overall system and / or without changing other hardware components.
  • the measurement signal can be advantageous to scan the light source 11 at a specific frequency, i. H. to work in pulse mode.
  • the measurement signal can be distinguished from the excitation cycle without difficulty using conventional methods of comparison and filtering.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Dot-Matrix Printers And Others (AREA)

Claims (7)

  1. Procédé d'ajustage opto-électronique pour le positionnement automatique commandé par ordinateur des pochoirs (1) d'une machine de sérigraphie rotative par exploration optique de marques d'impression (14, 16) de configuration variable placées sur les pochoirs (1), selon lequel les modèles de signaux fournis par l'élément récepteur (12) de la section de mesure opto-électronique (2) du fait du déplacement des pochoirs (1) lors de l'exploration des marques d'impression (14, 16), sont introduits dans un ordinateur (6) qui, au moyen d'un circuit logique préprogrammé, reconnaît le dessin des marques d'impression et délivre des instructions de commande à des servomoteurs (4[x], 5[y]) pour le positionnement axial (y) et le positionnement angulaire (x) du pochoir (1) respectivement considéré, caractérisé en ce qu'on utilise une section de mesure opto-électronique (2) qui traverse la paroi du cylindre creux du pochoir (1) respectif, dont la source de lumière (11) utilise de la lumière cohérente, en particulier de la lumière laser.
  2. Procédé d'ajustage opto-électronique selon la revendication 1, caractérisé en ce que la section de mesure opto-électronique (2) fonctionne en mode pulsé.
  3. Dispositif d'ajustage pour le positionnement automatique commandé par ordinateur des pochoirs (1) d'une machine de sérigraphie rotative, avec exploration opto-électronique de marques d'impression (14, 16) de configuration variable placées sur les pochoirs (1) et traitement du modèle de signaux électriques fourni par les marques d'impression (14, 16) dans un ordinateur (6) qui, grace à un circuit logique préprogrammé, reconnait le modèle de marques d'impression et fournit des instructions de commande pour des servomoteurs (4[x], 5[y]) pour l'ajustage axial et en rotation du pochoir (1) considéré, caractérisé en ce que la section de mesure optique (2) du dispositif de détection opto-électronique (11, 12) fonctionne avec une source de lumière cohérente (11) dont la lumière traverse la paroi du cylindre creux du pochoir (1) respectif dans une zone transparente dans laquelle sont également disposées les marques d'impression (14, 16).
  4. Dispositif d'ajustage selon la revendication 3, caractérisé en ce que la source de lumière (11) du dispositif de détection opto-électronique (11, 12) est située à l'extérieur, et l'élément de réception (12), à l'intérieur du pochoir (1) respectif.
  5. Dispositif d'ajustage selon l'une des revendications 3 ou 4, caractérisé en ce qu'au moins l'un des deux éléments (11, 12) du dispositif de détection opto-électronique (11, 12) peut être déplacé de manière blocable transversalement par rapport à l'axe optique de la section de mesure (2), sur des faibles distances d'ajustage.
  6. Dispositif d'ajustage selon l'une des revendications 4 ou 5, caractérisé en ce que de la lumière laser est prévue pour la section de mesure optique du dispositif de détection opto-électronique (11, 12).
  7. Dispositif d'ajustage selon la revendication 6, caractérisé en ce que la lumière laser est de préférence pulsée.
EP90105272A 1989-03-23 1990-03-20 Procédé et dispositif d'ajustage photoélectrique pour le positionnement automatique commandé par ordinateur pour les blocs d'impression d'une presse rotative de sérigraphie Expired - Lifetime EP0388904B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909764 1989-03-23
DE3909764A DE3909764A1 (de) 1989-03-23 1989-03-23 Opto-elektronisches justierverfahren und einrichtung zur automatischen rechnergesteuerten positionierung der druckschablonen einer rotationssiebdruckmaschine

Publications (3)

Publication Number Publication Date
EP0388904A2 EP0388904A2 (fr) 1990-09-26
EP0388904A3 EP0388904A3 (fr) 1991-01-09
EP0388904B1 true EP0388904B1 (fr) 1994-08-17

Family

ID=6377144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105272A Expired - Lifetime EP0388904B1 (fr) 1989-03-23 1990-03-20 Procédé et dispositif d'ajustage photoélectrique pour le positionnement automatique commandé par ordinateur pour les blocs d'impression d'une presse rotative de sérigraphie

Country Status (4)

Country Link
EP (1) EP0388904B1 (fr)
AT (1) ATE110027T1 (fr)
DE (2) DE3909764A1 (fr)
ES (1) ES2057229T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402715B (de) * 1994-06-30 1997-08-25 Oesterr Forsch Seibersdorf Anordnung zur einstellung von druckwalzen
DE4431638A1 (de) * 1994-09-06 1996-03-14 Balsfulland Maschfabrik Gmbh Verfahren zur Passerung von drehbar aufgenommenen Gegenständen für die Durchführung von Druckvorgängen
DE19651193A1 (de) * 1996-12-10 1998-06-18 Roland Man Druckmasch Justiereinrichtung einer vor einem Zylinder einer Rotationsdruckmaschine angeordneten Traverse
DE102009037332A1 (de) * 2009-08-14 2011-02-17 Zyrus Beteiligungsgesellschaft Mbh & Co. Patente I Kg Rotationssiebdruckvorrichtung und -verfahren

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136701C1 (de) * 1981-09-16 1983-04-07 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum Abtasten von auf Druckgut aufgedruckten,die Lagegenauigkeit des Druckfarbenauftrages charakterisierender Passmarken
DE3136703C1 (de) * 1981-09-16 1982-11-04 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Einrichtungen an Druckmaschinen mit Registerverstelleinrichtungen
DD228492A1 (de) * 1984-11-14 1985-10-16 Polygraph Leipzig Einrichtung zur register-einstellung an druckmaschinen
DE3703998A1 (de) * 1986-06-14 1987-12-17 Roland Man Druckmasch Einrichtung an druckmaschinen mit stelleinrichtungen fuer umfangs-, seiten- und diagonalregister

Also Published As

Publication number Publication date
EP0388904A2 (fr) 1990-09-26
DE3909764A1 (de) 1990-09-27
ES2057229T3 (es) 1994-10-16
ATE110027T1 (de) 1994-09-15
EP0388904A3 (fr) 1991-01-09
DE59006805D1 (de) 1994-09-22
DE3909764C2 (fr) 1991-05-16

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