EP0260492B1 - Automatic printing plate-tightening device for sheet-fed printing machine - Google Patents

Automatic printing plate-tightening device for sheet-fed printing machine Download PDF

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Publication number
EP0260492B1
EP0260492B1 EP19870112340 EP87112340A EP0260492B1 EP 0260492 B1 EP0260492 B1 EP 0260492B1 EP 19870112340 EP19870112340 EP 19870112340 EP 87112340 A EP87112340 A EP 87112340A EP 0260492 B1 EP0260492 B1 EP 0260492B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
printing plate
plate
tightening device
tightening
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
Application number
EP19870112340
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0260492A3 (en
EP0260492A2 (en
Inventor
Yasuhiko C/O Mihara Machinery Works Hirata
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0260492A2 publication Critical patent/EP0260492A2/en
Publication of EP0260492A3 publication Critical patent/EP0260492A3/en
Application granted granted Critical
Publication of EP0260492B1 publication Critical patent/EP0260492B1/en
Expired 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
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1231—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by translatory motion substantially tangential to support surface

Definitions

  • the present invention relates to an automatic printing plate-tightening device for use with a sheet-fed printing machine.
  • FIG. 5 shows the condition in which upper teeth are open.
  • Fig. 6 shows the condition in which the upper teeth are closed to tighten a printing plate.
  • Fig. 7 is a plan view of the manual printing plate-tightening device.
  • a plate cylinder 01 is equipped with platetightening devices 03r and 03e.
  • Each time the printed item is varied, a preparation time is required. This time greatly affects the rate of operation of a printing machine.
  • a time taken to exchange the printing plate accounts for a considerable proportion of the preparation time.
  • various devices have been invented.
  • the time taken to exchange a printing plate differs considerably among printing sites. Statistics shows the average time.
  • the time taken to operate an eccentric shaft, or cam shaft, for tightening a printing plate and bolts for stretching the plate accounts for most of the exchange time.
  • the right side to the vertical center line is the front portion of the printing plate, while the left side is the rear portion.
  • the plate cylinder 01 is provided with a recess 02 in which the plate-tightening device 03r placed in the front portion and the tightening device 03e placed in the rear portion are received.
  • the tightening device 03r has an upper tooth 05r, a lower tooth 04r, a pin 06r, a tightening cam 07r, and a bolt 08r for fine adjustment.
  • the tightening device 03e has an upper tooth 05e, a lower tooth 04e, a tightening cam 07e, a bolt 08e for fine adjustment, and a plate-stretching cam 09.
  • wrenches When the printing plate, indicated by numeral 10, is mounted or removed, wrenches are brought into engagement with wrench attachment portions 12r and 12e on the cam shafts 07r and 07e, respectively, which are mounted at the lateral center of the machine. Then, the wrenches are manually rotated through about 90°.
  • an automatic printing plate-tightening device for use with a sheet-fed printing machine, said device having a plate cylinder, a cam shaft extending from one side surface of the cylinder, an arm mounted on the cam shaft, a pin mounted at the end of the arm, a first cylinder capable of rotating the arm about the cam shaft, and a second cylinder capable of changing the orientation of the first cylinder.
  • the front end of the first cylinder can engage with the pin.
  • the arm is rotated by the first cylinder to tighten or release a printing plate.
  • the present tightening device After the completion of the installation of the printing plate, the present tightening device is held at its standby position so as not to hinder the printing operation.
  • This series of operations is electrically controlled in a sequential manner.
  • FIG. 1 - 4 there is shown an automatic printing plate-tightening device according to the invention.
  • a printing plate-tightening cam shaft 1 protrudes from one side of a plate cylinder 21.
  • a front arm 2 is held to the cam shaft 1 by a bolt and a key.
  • a pin 3 is mounted to the front end of the arm 2.
  • another printing plate-tightening cam shaft 4 protrudes from the side surface of the plate cylinder 21.
  • a rear arm 5 is rigidly fixed to the cam shaft 4.
  • a pin 6 is affixed to the end of the arm 5.
  • the closed position of the arm 2 is indicated by I, while the open position is indicated by II.
  • the arm 2 is placed in position II, the front end of the printing plate is inserted between upper and lower teeth. Then, the arm 2 is returned to position I, thus fully tightening the front portion of the plate.
  • a cylinder 7 acts to rotate the cam shaft 1, and consists of a hydraulic cylinder having a cylinder rod 8 whose rotation is limited.
  • a metallic fixing member 9 is provided at the front end of the rod 8 to transmit its power to the pin 3.
  • the cylinder 7 is coupled to a bracket 10 by an attachment 11.
  • the bracket 10 serves to hold the cylinder 7, and is designed to be rotatable about a point C on a frame 22 via bearings (not shown).
  • a locating cylinder 12 rotates the bracket 10 to vary the orientation of the cylinder 7.
  • the front end of the rod of the cylinder 12 is connected to the bracket 10 via a pin 13 (Fig. 2).
  • the rear end of the cylinder 12 is rigidly fixed to the frame 22 via a bracket 14.
  • the center of rotation C of the cylinder 7 is so set that the front and rear cam shafts can be operated most appropriately by the cylinder 7.
  • Fig. 1 shows the condition in which the present device has just begun to tighten the front portion of the printing plate.
  • the rod of the cylinder 7 When the rod of the cylinder 7 is retracted, the upper tooth of the tightening device corresponding to the tooth 05r shown in Fig. 5 moves away from the opposite upper tooth (the arm 2 is moved into position II). Under this condition, the front portion of the printing plate is inserted into the tightening device. Then the rod of the cylinder 7 is advanced. This brings the arm 2 into position I, thus completing the tightening operation. During this process, the rod of the cylinder 12 is kept retracted, and the cylinder 12 is maintained at position III shown in Fig. 1.
  • the plate cylinder 21 is made to make an approximately 3/4 revolution in the direction indicated by the arrow so that the plate may be wound on the cylinder 21.
  • the orientation of the cylinder 7 is shifted from position III to IV by the cylinder 12.
  • Fig. 3 shows the next step in which the present device has just begun to tighten the rear portion of the plate.
  • the rod of the cylinder 7 is retracted as in the previous step to move the upper tooth of the tightening device corresponding to the tooth 05e shown in Fig. 5 away from the opposite tooth.
  • the rear portion of the printing plate is inserted into the tightening device.
  • the rod of the cylinder 7 is advanced.
  • the tightening operation is completed.
  • the rod of the cylinder 12 is maintained at its advanced position to hold the cylinder 7 at position IV.
  • Fig. 4 shows the condition in which both the front portion and the rear portion of the printing plate have been fully tightened.
  • the cylinder 7 is at its standby position so as not to hinder the printing operation.
  • a separate device (not shown) is provided to maintain the plate cylinder at rest while the plate is tightened and released.
  • the novel printing plate-tightening device for tightening the front and rear portions of the printing plate according to the present invention uses the two hydraulic cylinders. Hence, tightening both portions of the plate can be performed by the single device. In this way, the printing plate exchange operation is automated, thus saving labor. Also, no skillful operator is needed. In addition, the safety of the operation is enhanced. Furthermore, the exchange operation is performed in a shorter time than conventional. Additionally, the novel device has a simple structure and is economical to fabricate.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP19870112340 1986-09-17 1987-08-25 Automatic printing plate-tightening device for sheet-fed printing machine Expired EP0260492B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP141428/86U 1986-09-17
JP1986141428U JPH0620609Y2 (ja) 1986-09-17 1986-09-17 枚葉印刷機の自動版締め装置

Publications (3)

Publication Number Publication Date
EP0260492A2 EP0260492A2 (en) 1988-03-23
EP0260492A3 EP0260492A3 (en) 1989-08-23
EP0260492B1 true EP0260492B1 (en) 1991-11-06

Family

ID=15291749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870112340 Expired EP0260492B1 (en) 1986-09-17 1987-08-25 Automatic printing plate-tightening device for sheet-fed printing machine

Country Status (3)

Country Link
EP (1) EP0260492B1 (ja)
JP (1) JPH0620609Y2 (ja)
DE (1) DE3774377D1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936458C1 (ja) * 1989-11-02 1991-04-11 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
JP2565250Y2 (ja) * 1990-09-27 1998-03-18 株式会社小森コーポレーション 印刷機の版万力装置
DE4137948A1 (de) * 1990-11-19 1992-05-21 Sumitomo Heavy Industries Druckplatten-spannvorrichtung fuer eine druckmaschine
DE4111636C1 (ja) * 1991-04-10 1992-07-30 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE4223328C2 (de) * 1992-07-16 1994-05-19 Roland Man Druckmasch Vorrichtung zum Befestigen von Druckplatten auf dem Plattenzylinder von Druckmaschinen, insbesondere Bogenoffsetdruckmaschinen
DE29807377U1 (de) * 1998-04-23 1998-07-16 MAN Roland Druckmaschinen AG, 63075 Offenbach Befestigungsvorrichtung für Platten auf Druckmaschinenzylindern
JP4829420B2 (ja) * 2000-05-17 2011-12-07 株式会社小森コーポレーション 印刷機

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58140254A (ja) * 1982-02-17 1983-08-19 Tokyo Kikai Seisakusho:Kk 輪転機の版胴における刷版着脱機構自動操作装置
JPH07378B2 (ja) * 1982-04-29 1995-01-11 株式会社東京機械製作所 輪転印刷機の刷版自動着脱装置
JPS6061265A (ja) * 1983-09-14 1985-04-09 Mitsubishi Heavy Ind Ltd 印版クランプ装置
JPS6073850A (ja) * 1983-09-26 1985-04-26 Tokyo Kikai Seisakusho:Kk 輪転機における刷版自動着脱装置

Also Published As

Publication number Publication date
EP0260492A3 (en) 1989-08-23
JPS6347134U (ja) 1988-03-30
EP0260492A2 (en) 1988-03-23
JPH0620609Y2 (ja) 1994-06-01
DE3774377D1 (de) 1991-12-12

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