EP1046502B1 - Dispositif de contrôle du positionnement repéré des plaques d'impression - Google Patents

Dispositif de contrôle du positionnement repéré des plaques d'impression Download PDF

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Publication number
EP1046502B1
EP1046502B1 EP00107565A EP00107565A EP1046502B1 EP 1046502 B1 EP1046502 B1 EP 1046502B1 EP 00107565 A EP00107565 A EP 00107565A EP 00107565 A EP00107565 A EP 00107565A EP 1046502 B1 EP1046502 B1 EP 1046502B1
Authority
EP
European Patent Office
Prior art keywords
signal generator
plate
printing plate
printing
signal
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
EP00107565A
Other languages
German (de)
English (en)
Other versions
EP1046502A1 (fr
Inventor
Peter Biernot
Bernd Lindner
Helmut Schild
Thomas Kleinschmitt
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.)
Manroland AG
Original Assignee
MAN Roland 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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP1046502A1 publication Critical patent/EP1046502A1/fr
Application granted granted Critical
Publication of EP1046502B1 publication Critical patent/EP1046502B1/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
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/30—Detecting the correct position of printing plates on the cylinder

Definitions

  • the invention relates to a device for controlling the registration of printing plates on the plate cylinder of printing machines, in particular sheet-fed offset printing machines, according to the preamble of claim 1.
  • the individual printing plates are first attached to the edge associated with the beginning of printing on a fastening device and then mounted around the outer periphery of the plate cylinder. This is followed by fixing the edge associated with the duck. So that the individual printing plates are in register with one another, punched holes are made on the leading edge (beginning of printing) which cooperate with stops in the form of register pins mounted on the plate cylinder or fastening device.
  • the fastening of the Druckggling- edge of the pressure plate is only when the pressure plate rests with their punched to the register pins.
  • the known devices described above for determining the position of a printing plate on the plate cylinder of printing presses which are suitable for the register are preferably used in semi- or fully automatic printing plate changers.
  • the fastening device for the Druckggling- edge of the printing plate is closed, after which the mounting of the printing plate can take place on the outer circumference of the plate cylinder.
  • such means for determining the register-correct position are also in manual plate changes, i. an operator introduces the pressure plate into the fastening device for the pressure beginning of the plate, helpful and useful. Again, the closing of the fastening device for the printing plate leading edge takes place only when the register-correct position has been determined.
  • Object of the present invention is therefore to develop a device for controlling the register-oriented position of printing plates on the plate cylinder of printing presses according to the preamble of claim 1 such that a simple and inexpensive determination of the register-oriented position is possible.
  • the plate cylinder is associated with a signal generator, by which a signal can be generated when the position of the printing plate leading edge, based on the feed direction occupies or exceeds a certain range.
  • the signal generator cooperates with the printing plate leading edge outside of the stops of the plate cylinder associated punched out. If the plate cylinder has two register pins which are axially spaced apart from each other, then, according to one embodiment of the invention, a signal transmitter to be arranged centrally between these register pins can be provided.
  • This signal generator is preferably arranged such that it already emits a signal when the edge of the pressure plate in the region of the stops (punched holes) still has a predetermined distance from the punched-out.
  • a register-indicating position of the printing plate signaling or automatic closing of the fastening device for the printing plate leading edge takes place exactly when that through the signal generator generated signal applies at least a predetermined period of time unchanged.
  • the present invention makes use of the knowledge that a pressure plate, which already lies in the area of the stops with its punched-out parts, will certainly be brought to the stops (register pins) with the propulsion force still applied.
  • the operator When manually changing printing plates, i. the printing plate is fed by an operator to the plate cylinder, the operator must press the printing plate for a predetermined period of time in the open fastening device of the plate cylinder. If the pressure plate is introduced into the fastening device with a predetermined minimum depth, a signal is generated by the signal generator according to the invention.
  • the operator performing the manual change of the printing plate does not hold the printing plate in contact with the register pins or with pressure in the opened fastening device (clamping rail) over the predetermined period of time, this is displayed on a corresponding display device and the operator is requested to complete the feeding process to repeat.
  • the same procedure is provided in an automatic printing plate changer, in which the feeding of the printing plate by means of transport, for example in the form of transport rollers, is effected.
  • the means of transport promote the pressure plate with a certain force in the direction of the open fastening device (clamping rail), so that when the printing plate leading edge has only reached the defined by the signal generator (measuring range) minimum depth within the clamping rail, it can be assumed that the pressure plate with the punched at the attacks is brought into contact.
  • the minimum depth or signal generated by the signal generator "pressure plate present" must not change within the specified period of time. If the signal which can be generated by the signal generator changes with regard to the plate position, this is an indication of a disturbance in the printing plate feeding process. Provided here by the means of transport to promote the pressure plate again out of the detection range of the fastening device out and to repeat the feeding process.
  • the signal generator according to the invention can be constructed as a mechanical probe, as an optical or inductive sensor or as a sensor system operating according to the principle of the light barrier. It is essential here that a signal can be generated by the signal generator if and only if the front edge of the printing plate has taken a predetermined minimum distance in the open fastening device for the printing plate leading edge.
  • the signal generator according to the invention can be mounted directly on the plate cylinder or within the fastening device for the printing plate leading edge. It is also possible to arrange the signal generator outside of the plate cylinder and only allocate (hire) the plate cylinder when feeding a new printing plate.
  • the signal generator can be suspended in this embodiment of the invention on a frame-fixed axis in front of the plate cylinder and at the corresponding position of the plate cylinder, in which the printing plate fed into the plate cylinder is employed, to the plate cylinder or the fastening device of the plate cylinder.
  • an orientation of the signal transmitter (sensor) preferably takes place by centering means. This ensures that the signal generator assumes a defined position with respect to the plate cylinder / fastening device after setting against the plate cylinder and thus the position determination (determination of the minimum insertion depth of the printing plate leading edge) takes place exactly with respect to plate cylinder.
  • the signal transmitter is arranged inside the plate cylinder, its signals are passed through a rotary transformer mounted on the plate cylinder or via suitable means for transmitting the signals out of the cylinder.
  • the processing of the signals of the signal generator processing circuit is preferably arranged outside of the plate cylinder and connected directly to the printing plate changing process triggering control (machine control).
  • the evaluation circuit also evaluates the signal in terms of time, i. whether the printing plate leading edge occupies the predetermined period of time defined by the position of the signal generator minimum depth within the fastening device.
  • a corresponding signal for displaying the register-compliant system can be generated on a display device and / or a signal for automatic closing the fastening device generated and delivered to the machine control.
  • FIG. 1 shows a pressure plate 1 which has two U-shaped punched-out portions 6, 7 at the edge assigned to the beginning of the pressure. These punched-out sections 6, 7 cooperate in a manner known per se with stops 4, 5 formed as register pins, of a plate cylinder 2 shown in FIG. 1 from above. Shown in Figure 1 is also the front edge of the pressure plate 1 receiving fastening device 3, which is formed for example as a clamping device. In this embodiment, the stops 4, 5 are arranged directly in the fastening device 3 (clamping rail).
  • the plate cylinder 2 and the fastening device 3 is associated with a signal generator 8, which is formed according to the embodiment described here as acting on the triangulation principle distance sensor.
  • the signal generator 8 can thus be determined whether an object (front edge of the printing plate 1) in the position range 9 (measuring or tactile area) is located within the fastening device 3.
  • the signal generator 8 delivers a signal to the downstream evaluation unit 10 when the front edge of the pressure plate 1 has reached the position range 9 of the signal generator 8. If the pressure plate 1 with the front edge is not inserted deeply enough into the fastening device 3, the edge of the pressure plate 1 can not be detected by the signal generator 8 (position range 9).
  • FIG. 2 explains the minimum depth of the pressure plate 1 to be introduced into the fastening device 3 (the front edge thereof).
  • the scanning distance of the signal generator 8 position range 9) is selected in the fastening device 3 in connection with the stops 4, 5, so that the pressure plate 1 in the region of the punched-out 6, 7 still have a distance a, b to the stops 4, 5 can, when the leading edge of the pressure plate 1 in the position range 9 of the signal generator 8 is located.
  • the pressure plate 1 is thus far enough in the fastening device 3 (minimum depth) introduced.
  • the distances a, b are the same. These distances a, b are determined by experiments and depend on the size and shape of the U-shaped punched-out sections 6, 7 as well as the size and shape of the stops 4, 5.
  • the detection signal is evaluated to the effect that when the signal generator 8 detects the presence of the pressure plate 1 and the leading edge of the printing plate 1, this signal must be present for at least a predetermined period of time. Only in this case, for example, to a not shown and the evaluation unit 10 downstream display device, the signal "printing plate is in accordance with the register" issued. If the fastening device 3 is associated with actuators for automatically closing the fastening device 3, then the signal "fastening device close" can be generated.
  • the minimum depth at which the printing plate 1 (the leading edge thereof) is to be inserted into the opened fixing device 3 has been defined with reference to FIGS.
  • the signal generator 8 only generates a signal "pressure plate present” when the pressure plate 1 with its front edge lies further than the position range 9 of the signal generator 8 within the fastening device 3.
  • downstream evaluation unit 10 is now checked whether the signal "pressure plate exists” within a predetermined time interval pernament or not. If the signal "printing plate present" pernament within this time interval, it can be assumed that the pressure plate 1 from the position shown in Figure 2 has been moved to the reproduced in Figure 3 position, ie with the punched-6, 7 abuts against the stops 4, 5.
  • Figures 4 and 5 show two possible arrangements of the signal generator 8 with respect to the fastening device 3.
  • the fastening device 3 is formed as a gap-shaped detection area 11 having a clamping rail.
  • the pressure plate 1 (printhead) is inserted into this detection area 11 and then clamped.
  • Such fastening devices are known per se and require no further explanation at this point.
  • the signal generator 8 is arranged in the direction of conveyance (feed direction) of the pressure plate 1, that is to say as an extension of the gap-shaped detection region 11.
  • the fastening device 3 clamping rail
  • a recess 12 through which the operating example of the triangulation principle signal generator 8, the front edge of the printing plate 1 in the detection range 11 (position range 9).
  • the signal generator 8 scans the front edge of the pressure plate 1 located in the detection region 11 perpendicular to its feed direction.
  • the released the measuring beam of the signal generator 8 recess 12 is arranged in the fastening device 3 (clamping rail) corresponding to perpendicular to the gap-shaped detection area 11.
  • the signal generator 8 can be fixedly arranged on the fastening device 3 or the plate cylinder 1, not shown.
  • the signal generator 8 is employed at the intended for the feeding of the printing plate angular position of the plate cylinder to the fastening device 3 and is aligned by additional, not shown means with respect to the fastening device 3 and the recess 12.
  • the evaluation unit 10 (not shown in Figures 4 and 5) may then be connected directly to the signal generator 8. If the signal generator 8 is arranged in the rotatably mounted plate cylinder 1, then this is connected via a rotary transformer or suitable wireless transmission media to the stationary evaluation unit 10 arranged outside the plate cylinder.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Fuel Cell (AREA)
  • Liquid Crystal (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (7)

  1. Dispositif de contrôle du positionnement repéré des plaques d'impression sur le cylindre porte-plaques de machines d'impression, en particulier de machines d'impression offset à feuilles, comportant un dispositif de fixation pour le bord avant de la plaque d'impression, la plaque d'impression présentant sur le bord avant une découpe en forme de U, laquelle peut être amenée en contact avec une butée agencée sur le cylindre porte-plaques, et un émetteur de signaux déterminant la position de la plaque d'impression dans le dispositif de fixation,
    caractérisé en ce que l'émetteur de signaux (8) permet de détecter le bord avant de la plaque d'impression (1) à l'extérieur de la découpe (6, 7) coopérant avec la butée (4, 5), un signal pouvant être émis par l'émetteur de signaux (8) lorsque la découpe (6, 7) présente une distance minimale (a, b) prédéfinie par rapport à la butée (4, 5).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que, avec deux butées (4, 5) espacées axialement, l'émetteur de signaux est agencé au milieu entre les butées (4, 5).
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que l'émetteur de signaux (8) est agencé sur le dispositif de fixation (3).
  4. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que l'émetteur de signaux (8) est agencé à l'extérieur du cylindre porte-plaques (2) et, dans la position prévue pour l'introduction de la plaque d'impression (1), peut être appuyé contre le cylindre porte-plaques (2).
  5. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que l'émetteur de signaux (8) est réalisé sous la forme d'un capteur de distance détectant la présence de la plaque d'impression (1) dans une zone de mesure.
  6. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que l'émetteur de signaux (8) est réalisé sous la forme d'un capteur sans contact coopérant avec la plaque d'impression (1).
  7. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que, par le biais d'une unité d'analyse (10) branchée en aval de l'émetteur de signaux (8), le signal de l'émetteur de signaux (8) est vérifié quant à ses variations dans un laps de temps pouvant être pré-défini.
EP00107565A 1999-04-22 2000-04-07 Dispositif de contrôle du positionnement repéré des plaques d'impression Expired - Lifetime EP1046502B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29907120U DE29907120U1 (de) 1999-04-22 1999-04-22 Einrichtung zur Kontrolle der registergerechten Anlage von Druckplatten
DE29907120U 1999-04-22

Publications (2)

Publication Number Publication Date
EP1046502A1 EP1046502A1 (fr) 2000-10-25
EP1046502B1 true EP1046502B1 (fr) 2007-05-30

Family

ID=8072535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00107565A Expired - Lifetime EP1046502B1 (fr) 1999-04-22 2000-04-07 Dispositif de contrôle du positionnement repéré des plaques d'impression

Country Status (4)

Country Link
EP (1) EP1046502B1 (fr)
JP (1) JP3370645B2 (fr)
AT (1) ATE363393T1 (fr)
DE (2) DE29907120U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6794626B2 (en) * 2002-01-15 2004-09-21 Agfa Corporation Method and system for verifying correct mounting of a printing plate on an external drum imaging machine
DE102006048676B4 (de) * 2006-10-14 2011-07-07 KOENIG & BAUER Aktiengesellschaft, 97080 Einrichtung zum Erkennen eines Vorhandenseins eines Aufzugs auf einem Zylinder
DE102020106729A1 (de) * 2020-03-12 2021-09-16 Koenig & Bauer Ag Druckmaschine mit einer Vorrichtung zum Erfassen der Anwesenheit einer Auftragsform und Verfahren zum Zuführen einer Auftragsform

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3194199B2 (ja) * 1992-01-17 2001-07-30 株式会社小森コーポレーション 版胴への刷版装着装置

Also Published As

Publication number Publication date
EP1046502A1 (fr) 2000-10-25
DE29907120U1 (de) 1999-07-01
DE50014357D1 (de) 2007-07-12
ATE363393T1 (de) 2007-06-15
JP3370645B2 (ja) 2003-01-27
JP2000318134A (ja) 2000-11-21

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