EP0593935B1 - Dispositif de repérage pour une machine d'impression de feuilles, et procédé de repérage - Google Patents

Dispositif de repérage pour une machine d'impression de feuilles, et procédé de repérage Download PDF

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Publication number
EP0593935B1
EP0593935B1 EP93115411A EP93115411A EP0593935B1 EP 0593935 B1 EP0593935 B1 EP 0593935B1 EP 93115411 A EP93115411 A EP 93115411A EP 93115411 A EP93115411 A EP 93115411A EP 0593935 B1 EP0593935 B1 EP 0593935B1
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EP
European Patent Office
Prior art keywords
register
printing
adjusting device
sheet
sensor
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
EP93115411A
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German (de)
English (en)
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EP0593935A1 (fr
Inventor
Tobias Dr. Müller
Anton Rodi
Klaus Dr. Müller
Holger Leonhardt
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
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Publication of EP0593935A1 publication Critical patent/EP0593935A1/fr
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Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to a register adjustment device on a sheet-fed printing machine, in particular for circumferential, page, narrow-pressure, wide-print and / or diagonal register adjustments, with an optical position sensor, a lighting source and an evaluation unit, the actuating data of which are sent to actuators of the adjusting device.
  • a web printing machine is known from European patent application 0 289 206, the printing material web of which is illuminated with a light source in order to use a detector to detect light reflections from markings one behind the other in the printing direction. In this way, the speed of the printing material web can be determined and the position of the printing material web can be determined transversely to its direction of movement.
  • Register adjustment devices of the type mentioned are known.
  • the operator removes a printed sheet from the sheet-fed printing machine and places it on an evaluation panel of a device separate from the sheet-fed printing machine.
  • the positions of printed register marks can be determined and adjustment values determined by means of an evaluation unit. These are then set by the operator on the sheet-fed printing press for circumferential side and / or diagonal register adjustments.
  • An automatic adjustment of these control values found is also possible in offline mode.
  • a narrow or wide pressure register correction can also be carried out in a corresponding manner. This work requires a lot of experience and Delicacy, so that only highly qualified personnel can be deployed. The success of the adjustment work is not always guaranteed within short guidelines.
  • EP-A-0444583 also shows a system for detecting marks applied to a printing material, the marks being scanned by means of a video camera.
  • the invention is therefore based on the object of optimizing the sensory detection of the marks affixed to the printing material and of increasing the functional reliability.
  • a device Due to the arrangement of the position sensor in the area of the printing material path of the sheet-fed printing press, no additional, separate device is required to record the register data. Rather, in the so-called inline mode, position detection and automatic evaluation after evaluation of the recorded data is possible. In contrast to the prior art, the positioning data determined by the evaluation unit are not set by the operator on the sheet-fed printing press, but are sent as setting commands to actuators for automatic register setting of the sheet-fed printing press in inline operation.
  • the sensor heads can be moved independently of one another transversely to the direction of movement of the substrate.
  • the movability allows the sensor heads to be aligned with the position of the registers or marks of the sheets of the printing material.
  • the positions of the sensor heads can be easily adapted to the sheet format used. Marks, which are arranged one behind the other in the printing direction on a printing sheet, are detected by the sensor heads due to the movement of the printing material during operation.
  • the sensor head is only shifted during the straightening work before the actual start of printing, but not during printing.
  • the displacement of the sensor head is preferably carried out automatically. Only when the side register has been adjusted is a sensor head shift necessary during printing.
  • the sensor housing has at least one window made of translucent material for the exit of the light rays from the illumination source and for the entry of the light reflected from the printing material.
  • the arrangement of the two sensor heads in the closed sensor housing ensures trouble-free operation, since the sensitive sensor heads are shielded and are therefore not subject to contamination or the like. It is only important to ensure that the window that the exit of the Allows light rays from the lighting source and at the same time allows the entry of the reflected light, remains clean.
  • the window mentioned which is preferably made of glass or transparent plastic, can either be in one piece and thus let the light entering and leaving it, or it is formed in two parts, so that a partial window is used for the exit of the light rays and in the other partial window reflected light enters.
  • the hermetic seal of the sensor housing always ensures that the sensitive parts are protected.
  • the sensor heads can be moved by means of a drive device which is located in the interior of the sensor housing. This enables the aforementioned automatic alignment of the sensor heads to the areas of the printed sheet to be detected.
  • the sensor housing is preferably designed as a cylindrical or cuboid bar that extends parallel to the front edges of the sheets transported in the substrate path.
  • the shape of the last takes up very little space and is therefore not noticeable in the substrate path.
  • the illumination source is preferably designed as a cold light source, in particular as a cold white light source.
  • the dimensions of the sensor housing can be very small, since the illumination source does not have to be at the location of the sensor heads, that is to say not directly in the region of the printing material path. Rather, the lighting source can be accommodated at a suitable point that is not critical of the space requirement, wherein The light is transported to the sensor housing via the optical waveguide, which has only very small dimensions and is also flexible, so that it can also pass through poorly accessible and / or narrow areas without problems.
  • a wavelength splitter acting in the beam path of the illumination source is arranged in the lamp housing, which allows visible light to pass through and reflects heat radiation (IR radiation) from the illumination source or vice versa.
  • the radiation plate can preferably be designed as a "semitransparent (wavelength-selective) mirror” or as an IR cut filter.
  • the illumination source which generates high-intensity white light and is preferably designed as a halogen or gas discharge lamp, not only emits the desired white light, but also also emits a considerable amount of heat, which is transported out of the lamp housing due to the "beam splitter", so that the lamp housing as well can be hermetically sealed, but there is no overheating.
  • the lamp housing has an exit window that is transparent to the heat radiation reflected by the beam splitter.
  • the visible light passing through the beam splitter also reaches a window, for example made of glass or transparent plastic, and is fed from there to the optical waveguide. It is also possible to insert the optical waveguide into the lamp housing, whereby it passes through a hermetically sealed screw connection.
  • a reflector designed as an elliptical mirror is arranged inside the lamp housing and bundles the light from the illumination source to the optical waveguide.
  • the reflector it is also possible for the reflector to produce only parallel light, which is bundled by means of imaging optics and then reaches the optical waveguide.
  • a control device in whose control loop the position sensor is located as the actual value pickup and at least one actuator of the adjustment members as the actuator. This actuator brings about the register adjustments by adjusting the adjusting elements.
  • the design as a closed control loop produces particularly good printing results, since deviations that occur are always corrected, which ensures high precision.
  • the position sensor determines the adjustment values of a narrow or wide pressure register in accordance with the position determination of marks on the printing material and feeds at least one of the actuators assigned to the adjustment elements, which actuator interacts with a divided clamping rail of a printing plate cylinder which presses on a printing plate. Deformations of the printing material during the printing process lead to location-dependent register errors in the printed product, which are automatically detected by the position sensor through the narrow or wide pressure correction and are eliminated, preferably corrected, by means of action on the printing plate during the printing process.
  • the invention further relates to a method according to claim 13.
  • the brands mentioned are preferably arranged in the corner regions of the sheets. Since there are always at least two sensor heads, the two marks lying in the corner areas of the front sheet edge or in the corner areas of the sheet rear edge can be detected simultaneously.
  • FIG. 1 shows a sheet-fed printing press 1 with a plurality of printing units 2.
  • Printing unit 2 is assigned a position sensor 3, which is located after the printing cylinder of this printing unit 2 in the printing material path of the sheet-fed printing press 1.
  • This position sensor 3 belongs to a register adjustment device which enables circumferential, lateral, narrow, wide and / or diagonal register adjustments.
  • the data determined by the position sensor 3 are fed to an evaluation unit 4, the control values (control commands) are determined and fed to the individual printing units 2 for the corresponding, mechanically carried out register adjustment.
  • Figure 2 shows the position sensor 3 in a schematic representation. It has a hermetically sealed, strip-shaped sensor housing 5, in which two sensor heads 6, 7 can be moved along the longitudinal extent of the sensor housing 5.
  • the guides necessary for the movability are - for the sake of simplicity - not shown in FIG. 2.
  • This also applies to a drive device which enables the sensor heads 6 and 7 to be positioned independently of one another.
  • the mobility of the sensor heads 6 and 7 is indicated in FIG. 2 by means of the double arrows 8.
  • a window 10 made of translucent material, in particular glass, is inserted into the bottom wall 9 of the sensor housing 5 and can extend over the entire length of the housing. Light rays emanating from the sensor heads 6 and 7 can pass through the window 10 and hit the printing material.
  • each sensor head 6, 7 has a light transmitter and also a light receiver.
  • the incoming and outgoing light rays are indicated in FIG. 2 with dashed arrow lines.
  • the sensor housing 5 is included a hermetically sealed bushing 11 is provided, which is penetrated by a connecting cable 12, which comprises electrical and optical connecting lines.
  • the connecting cable 12 has an optical waveguide 13, which - according to FIG. 3 - leads to a lamp housing 14 which is hermetically sealed and houses a lighting source 15.
  • the illumination source 15 generates high-intensity white light; it can be designed as a halogen or gas discharge lamp.
  • a reflector 16 ′ designed as an elliptical mirror bundles the rays from the illumination source 15 and guides them to the optical waveguide 13.
  • a wavelength-selective beam splitter 16 which is designed as a "semi-transparent mirror” or as an infrared cut filter (IR cut filter).
  • the radiation (light rays) in the visible range passes the beam splitter; the heat radiation (IR radiation) is reflected by the beam splitter 16 and fed to an exit window 17 of the lamp housing 14, which is transparent to the heat radiation (alternatively, it is also possible for the heat radiation to pass the beam splitter and the visible light to be reflected, in which case the Positions of exit window and fiber optic are interchanged).
  • the thermal energy of the illumination source 15 is dissipated to the outside, so that the inside temperature does not rise to impermissibly high values despite the hermetically sealed lamp housing 14. In this way it is possible to supply cold white light to the sensor heads 6 and 7 via the optical waveguide 13.
  • the local separation of sensor housing 5 and lamp housing 14 has the advantage that only the strip-shaped sensor housing 5 has to be accommodated in the region of the printing material path of the sheet-fed printing press 1; the lamp housing 14 can be located at a less space-critical point on the sheet-fed printing press 1. Furthermore, by the training described avoided heat directly in the pressure area.
  • FIG. 4 shows a plan view of the base area of a sheet 20 for the sheet-fed printing press 1. It has a sheet leading edge 18, a sheet trailing edge 19 and corner regions 21. Marks 22 (measuring marks, register marks) are arranged in the corner regions 21 of the sheet 20 and are detected by the sensor heads 6 and 7 of the position sensor 3 during printing. The two sensor heads 6 and 7 position themselves automatically in such a way that they can detect the marks 22 in an optically correct manner. Due to the transport of the sheet 20 in the printing material path of the sheet-fed printing machine 1, the marks 22 located in the area of the sheet leading edge 18 and then the marks 22 located in the area of the sheet trailing edge 19 move past the sensor heads 6 and 7.
  • Register deviations with regard to the circumferential, side, narrow, wide and / or diagonal register are recognized.
  • the evaluation unit 4 processes the data recorded by the position sensor 3 of existing register deviations of the individual printing units 2 and issues corresponding control commands which lead to a correction. This is done fully automatically.
  • the corresponding components of the sheet-fed printing press 1 are actuated by means of suitable actuators (not shown) in order to make the register adjustments.
  • a control circuit 23 is provided in order to carry out the register adjustments.
  • An actual value transmitter 24 determines the register position / marks on the sheet 20.
  • the actual value transmitter 24 is therefore the position sensor 3. Its data are sent to the evaluation unit 4 for a setpoint / actual value comparison, the corresponding actuators 25 (actuators, for example electric motors) ) controls.
  • the actuators act on the printing process 26, the parameters of which in turn affect the Actual value transmitter 24 act. In this way, not only register deviations are registered, but also the influence of the printing material is determined, so that disturbances affecting the printing result (for example sheet lengthening, rolling out of the sheet transversely to the printing, etc.) are recognized and corrected.
  • FIG. 5 shows a further exemplary embodiment of a lamp housing 14, which differs from the exemplary embodiment in FIG. 3 in that there is an imaging optic 27 between the beam splitter 16 and the reflector 16 ', which is designed as a converging lens.
  • the reflector 16 ′ guides the light from the illumination source 15 with a parallel beam path to the imaging optics 27, which bundles it so that a bundled light beam can be fed to the optical waveguide 13. It is possible to couple the visible light directly into the optical waveguide or to first feed it to an exit window and then to the optical waveguide.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Labeling Devices (AREA)
  • Handling Of Sheets (AREA)
  • Ticket-Dispensing Machines (AREA)

Claims (14)

  1. Dispositif de réglage en alignement sur une presse à imprimer à feuilles (1), comportant un détecteur optique de position, une source d'éclairement (15), une unité de traitement (4) dont les données réglantes sont envoyées aux organes réglants du dispositif de réglage, le détecteur de position (3) étant disposé, pour la saisie, qui se fait sur le matériau à imprimer (20), de l'alignement en question, dans la zone du parcours du matériau à imprimer de la presse à imprimer à feuilles,
       caractérisé
       par le fait que le détecteur de position (3) présente au moins deux têtes de détecteur (6, 7) situées à distance l'une de l'autre, que les têtes de détecteur (6, 7) sont disposées dans un boîtier de détecteur (5) hermétiquement fermé et que la source d'éclairement est logée dans un boîtier de lampe distinct (14) et est reliée avec les têtes de détecteur (6, 7) par l'intermédiaire d'un guide d'ondes lumineuses (13) le long du boîtier de détecteur (5).
  2. Dispositif de réglage en alignement selon la revendication 1,
       caractérisé
       par le fait que les têtes de détecteur (6, 7) peuvent se déplacer indépendamment l'une de l'autre, perpendiculairement à la direction du mouvement du matériau à imprimer.
  3. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que le boîtier de détecteur (5) présente, pour la sortie des rayons lumineux de la source d'éclairement (15) et pour l'entrée de la lumière réfléchie par le matériau à imprimer, au moins une fenêtre (10) constituée d'un matériau transparent.
  4. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que les têtes de détecteur (6, 7) peuvent se déplacer au moyen d'un mécanisme d'entraînement qui se trouve à l'intérieur du boîtier de détecteur (5).
  5. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que le boîtier de détecteur (5) a la forme d'un barreau cylindrique ou parallélépipédique qui s'étend parallèlement au bord avant des feuilles (20) transportées sur le parcours du matériau à imprimer.
  6. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que la source d'éclairement (15) est conçue en tant que source de lumière blanche froide.
  7. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que dans le boîtier de lampe (14) est disposé un diviseur de faisceau (16) qui est situé sur le trajet des rayons de la source d'éclairement (15), agit sélectivement et sépare la lumière visible d'avec le rayonnement thermique de la source d'éclairement (15).
  8. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que le diviseur de faisceau (16) est un miroir sélectif à l'égard des longueurs d'onde ou un filtre d'interception des rayons infrarouges.
  9. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que le boîtier de lampe (14) présente une fenêtre de sortie (17) transparente au rayonnement thermique réfléchi par le diviseur de faisceau (16).
  10. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que dans le boîtier de lampe (14) est disposé un réflecteur (16') qui est conçu en tant que miroir elliptique et qui amène la lumière de la source d'éclairement (15), focalisée, au guide d'ondes lumineuses (13).
  11. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par un mécanisme de régulation dans le circuit de régulation (23) duquel le détecteur de pression (3) joue le rôle de récepteur de valeur réelle (24) et au moins un actionneur des organes de réglage joue celui d'élément réglant (25).
  12. Dispositif de réglage en alignement selon l'une des revendications précédentes,
       caractérisé
       par le fait que le détecteur de position (3) établit, en fonction de la détermination de la position de marques (22) se trouvant sur le matériau à imprimer (20), des valeurs de réglage de l'alignement de l'impression, en plus serré ou en plus large, et l'envoie au moins à l'un des actionneurs correspondant aux organes de réglage, actionneur qui collabore avec un rail de bridage qui, en la bridant, intervient sur une plaque d'un cylindre de plaque.
  13. Procédé de réglage en alignement sur des presses à imprimer à feuilles pour exécution au moyen d'un dispositif de réglage conforme à une ou plusieurs des revendications précédentes, dans lequel l'alignement respectif est saisi optiquement et mécaniquement sur le matériau à imprimer et dans lequel le résultat de la saisie est mis à profit pour le réglage mécanique automatique en alignement,
       caractérisé
       par le fait que, pour établir des influences du matériau à imprimer intervenant, en soi, sur le résultat de l'impression, des marques (22), disposées réparties sur la surface de fond de la feuille (20), sont saisies optiquement et leur position est traitée.
  14. Procédé selon la revendication 13,
       caractérisé
       par le fait que les marques (22) sont disposées dans les zones d'angle (21) de la feuille en question (20).
EP93115411A 1992-10-21 1993-09-24 Dispositif de repérage pour une machine d'impression de feuilles, et procédé de repérage Expired - Lifetime EP0593935B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4235393 1992-10-21
DE4235393A DE4235393A1 (de) 1992-10-21 1992-10-21 Registerverstelleinrichtung an einer Bogendruckmaschine sowie Verfahren zur Registerverstellung

Publications (2)

Publication Number Publication Date
EP0593935A1 EP0593935A1 (fr) 1994-04-27
EP0593935B1 true EP0593935B1 (fr) 1997-01-22

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Application Number Title Priority Date Filing Date
EP93115411A Expired - Lifetime EP0593935B1 (fr) 1992-10-21 1993-09-24 Dispositif de repérage pour une machine d'impression de feuilles, et procédé de repérage

Country Status (5)

Country Link
US (1) US5802973A (fr)
EP (1) EP0593935B1 (fr)
JP (1) JP3373264B2 (fr)
AT (1) ATE148041T1 (fr)
DE (2) DE4235393A1 (fr)

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DE102015204857A1 (de) * 2015-03-18 2016-09-22 Koenig & Bauer Ag Verfahren zum Anpassen mindestens eines Druckbildes und/oder mindestens eines Zylinderaufzugs an eine Bedruckstoffänderung in einer Druckmaschine
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Also Published As

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JPH06206309A (ja) 1994-07-26
JP3373264B2 (ja) 2003-02-04
DE59305231D1 (de) 1997-03-06
DE4235393A1 (de) 1994-04-28
ATE148041T1 (de) 1997-02-15
EP0593935A1 (fr) 1994-04-27
US5802973A (en) 1998-09-08

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