EP0849077A1 - Verfahren zur Herstellung von Druckproben von Bogen - Google Patents

Verfahren zur Herstellung von Druckproben von Bogen Download PDF

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Publication number
EP0849077A1
EP0849077A1 EP96120629A EP96120629A EP0849077A1 EP 0849077 A1 EP0849077 A1 EP 0849077A1 EP 96120629 A EP96120629 A EP 96120629A EP 96120629 A EP96120629 A EP 96120629A EP 0849077 A1 EP0849077 A1 EP 0849077A1
Authority
EP
European Patent Office
Prior art keywords
substrate
printing unit
flat
image
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.)
Withdrawn
Application number
EP96120629A
Other languages
English (en)
French (fr)
Inventor
Najeeb Khalid
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.)
Escher Grad Technologies Inc
Original Assignee
Escher Grad Technologies Inc
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 Escher Grad Technologies Inc filed Critical Escher Grad Technologies Inc
Priority to EP96120629A priority Critical patent/EP0849077A1/de
Publication of EP0849077A1 publication Critical patent/EP0849077A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/18—Rotary lithographic machines specially adapted for proof printing

Definitions

  • the present invention pertains to improvements in the field of offset lithography. More particularly, the invention is concerned with an improved method of generating proofs of print signatures.
  • Printers print multiple page images on both sides of a large sheet of paper. Such a printed sheet is called a print signature.
  • a single printed side on the other hand, is called a flat.
  • a print signature is composed of two flats printed on opposite sides of a sheet. The page images on each flat are positioned in a manner such that they are in the correct sequence after folding the print signature. The proof that a printer requires must have is the proof of the print signature.
  • a method of generating proofs of print signatures composed of first and second flats printed on opposite sides of a sheet comprises the steps of:
  • the imprinted substrate is provided with slack between the first and second printing units prior to being fed to the second printing unit.
  • a slack prevents the imprinted substrate from undergoing tensioning between the first and second printing units and possible rupture.
  • the first and second printing units are separate printing units each having an inlet for receiving the substrate and an outlet for discharging same, and they are coupled together by a bridge connecting the outlet of the first printing unit with the inlet of the second printing unit.
  • the imprinted substrate is conveyed from the fist printing unit to the second printing unit by passing the imprinted substrate along such a bridge.
  • each printing unit has a resolution ranging from about 300 to about 600 dots per inch, and the digital data is representative of the image of a flat at about 90,000 pixels per square inch.
  • the method of the invention enables one to avoid generating films from the digital data representative of both flats and preparing a proof from such films.
  • Printing unit 10A comprises a control system 18, an impression cylinder 20, a movable paper guiding device 22, a cartridge holder 24 for holding a plurality of ink cartridges 26 (only one shown) of different colors, and a printing head 28 integral with the holder 24.
  • the cartridge holder 24 in turn is mounted to a carriage 30 which is movable along guide rods 32 so as to displace the printing head 28 in a direction parallel to the rotation axis of the impression cylinder 20.
  • the printing unit 10A further includes a paper cutting device 34 comprising a wheel 36 which is movable along a guide rail 38 and carries a rotatable disk blade 40.
  • the printing unit 10B comprises a control system 42, an impression cylinder 44, a movable paper guiding device 46, a cartridge holder 48 for holding a plurality of ink cartridges 50 (only one shown) of different colors, and a printing head 52 integral with the holder 48.
  • the cartridge holder 48 is mounted to a carriage 54 which is movable along guide rods 56 so as to displace the printing head 52 in a direction parallel to the rotation axis of the impression cylinder 44.
  • the printing unit 10B further includes a paper cutting device 58 which is identical to the device 34.
  • the paper guiding devices 22 and 46 are also identical to one another and each comprise an arcuate member 60 and two idler rollers 62,64 rotatably mounted at the extremities of the member 60.
  • a continuous web 66 of paper is fed from a paper roll 68 to the printing unit 10A, between upper and lower guide members 70,72.
  • An optical detector 74 is provided for detecting the leading edge of the paper web 66 so as to trigger, via the control system 18, rotation of the impression cylinder 20 and movement of the paper guiding device 22 in a direction away from the cylinder 20.
  • the device 22 is moved in a direction towards the cylinder 20 to guide the paper web 66 around the cylinder and through the gap defined between the printing head 28 and the cylinder 20.
  • the printing head 28 prints a registration mark on one side of the paper web 66 at a predetermined location, for example, in a margin next to the first line of one of the two flats to be printed on opposite sides of the web.
  • Digital data representative of an image of the first flat is fed from the computer 76 to the printing head 28 via the control system 18 for imprinting one side of the paper web 66 with the image of the first flat.
  • the imprinted paper web 66' then passes between a movable pressure plate 78 and a support plate 80 and then on the latter, exits the printing unit 10A through the outlet 14 thereof, and passes through the bridge 12 comprising top and bottom walls 82,84.
  • the bottom wall 84 of the bridge 12 is provided with an opening 86 which is initially closed by a door 88 hinged to the wall 84.
  • the imprinted paper web 66' enters the printing unit 10B through the inlet 16 thereof and passes between upper and lower guide members 90 and 94.
  • An optical detector 94 is provided for detecting the leading edge of the imprinted paper web 66' so as to trigger, via the control system 42, rotation of the impression cylinder 44 and movement of the paper guiding device 46 in a direction away from the cylinder 44.
  • the device 46 is moved in a direction towards the cylinder 44 so that the web 66' is engaged between the cylinder 44 and roller 62.
  • the door 88 is opened and rotation of the impression cylinder 44 is stopped for a period of time sufficient to provide the imprinted paper web 66' with slack, the slacked web 66' hanging from the bridge 12 through the opening 86, as shown in Fig. 1. Rotation of the cylinder 44 is then resumed.
  • the imprinted paper web 66' is guided by the device 46 around the cylinder 44 and through the gap defined between the printing head 52 and the cylinder 44.
  • Another optical sensor 96 is provided for detecting the location of the registration mark printed on the web 66' by the printing head 28.
  • digital data representative of an image of the second flat is fed to the printing head 52 via the control unit 42 so as to imprint the other side of the paper web with the image of the second flat positioned with respect to the detected location of the registration mark such that the image of the second flat registers with the image of the first flat, thereby obtaining a proof 66'' of a print signature.
  • the proof 66'' of print signature passes between a movable pressure plate 98 and a support plate 100 and then on the latter, exits the printing unit 10A through the outlet 102 thereof, and is discharged onto an inclined tray 104.
  • the imprinted paper web 66' is cut with the paper cutting device 34 of printing unit 10A.
  • rotation of the impression cylinder 20 is stopped after the complete image of the first flat has been printed on one side of the paper web 66, the pressure plate 78 is moved to press the paper web against the support plate 80 and the paper web is cut with the disk blade 40, the other side of the paper web being imprinted with the image of the second flat by the printing head 52 of unit 10B.
  • the paper cutting device 58 of the printing unit 10B is used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP96120629A 1996-12-20 1996-12-20 Verfahren zur Herstellung von Druckproben von Bogen Withdrawn EP0849077A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96120629A EP0849077A1 (de) 1996-12-20 1996-12-20 Verfahren zur Herstellung von Druckproben von Bogen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96120629A EP0849077A1 (de) 1996-12-20 1996-12-20 Verfahren zur Herstellung von Druckproben von Bogen

Publications (1)

Publication Number Publication Date
EP0849077A1 true EP0849077A1 (de) 1998-06-24

Family

ID=8223532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120629A Withdrawn EP0849077A1 (de) 1996-12-20 1996-12-20 Verfahren zur Herstellung von Druckproben von Bogen

Country Status (1)

Country Link
EP (1) EP0849077A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1081562A1 (de) * 1999-08-17 2001-03-07 Canon Kabushiki Kaisha Bilderzeugungsgerät, das es einem Benutzer automatisch ermöglicht, mit dem ersten Ausdruck den Zustand von Druckkopien zu prüfen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605268A1 (fr) * 1986-10-17 1988-04-22 Vantalon Jean Paul Installation d'impression recto-verso notamment pour un systeme informatise
EP0317762A2 (de) * 1987-11-24 1989-05-31 Honeywell Bull Inc. Verfahren und Vorrichtung zum Papier-Steuern eines Druckers
EP0391223A2 (de) * 1989-04-01 1990-10-10 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Verfahren zum Betreiben einer Druckmaschine während einer Einstellphase (Andruck)
EP0711063A2 (de) 1994-11-02 1996-05-08 Nur Advanced Technologies Ltd. Gerät und Verfahren zum beidseitigen Drucken

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605268A1 (fr) * 1986-10-17 1988-04-22 Vantalon Jean Paul Installation d'impression recto-verso notamment pour un systeme informatise
EP0317762A2 (de) * 1987-11-24 1989-05-31 Honeywell Bull Inc. Verfahren und Vorrichtung zum Papier-Steuern eines Druckers
EP0391223A2 (de) * 1989-04-01 1990-10-10 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Verfahren zum Betreiben einer Druckmaschine während einer Einstellphase (Andruck)
EP0711063A2 (de) 1994-11-02 1996-05-08 Nur Advanced Technologies Ltd. Gerät und Verfahren zum beidseitigen Drucken

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1081562A1 (de) * 1999-08-17 2001-03-07 Canon Kabushiki Kaisha Bilderzeugungsgerät, das es einem Benutzer automatisch ermöglicht, mit dem ersten Ausdruck den Zustand von Druckkopien zu prüfen
US6453133B1 (en) 1999-08-17 2002-09-17 Canon Kabushiki Kaisha Image process apparatus with automatic setting of proof printing mode

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