EP0616887A1 - Rakelvorrichtung für eine Tiefdruckmaschine - Google Patents

Rakelvorrichtung für eine Tiefdruckmaschine Download PDF

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Publication number
EP0616887A1
EP0616887A1 EP94400634A EP94400634A EP0616887A1 EP 0616887 A1 EP0616887 A1 EP 0616887A1 EP 94400634 A EP94400634 A EP 94400634A EP 94400634 A EP94400634 A EP 94400634A EP 0616887 A1 EP0616887 A1 EP 0616887A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
doctor blade
receiver
blade holder
hydraulic fluid
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Withdrawn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
EP94400634A
Other languages
English (en)
French (fr)
Inventor
Pierre Capelle
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.)
Komori Chambon SA
Original Assignee
Komori Chambon SA
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 Komori Chambon SA filed Critical Komori Chambon SA
Publication of EP0616887A1 publication Critical patent/EP0616887A1/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Withdrawn legal-status Critical Current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
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1009—Doctors, scrapers, or like devices with reciprocating movement

Definitions

  • the present invention relates to a scraping device for a gravure printing apparatus.
  • Gravure printing devices have an engraved cylinder, rotated about its axis. Most of the peripheral surface of the printing cylinder has cells distributed over this surface according to the pattern which must be printed on a sheet or sheet of paper or plastic, metal, etc. which passes between the engraved cylinder and a back pressure cylinder, tangent to the previous one. Each of these cells is stuffed with ink following its passage opposite an inking device which is in contact with the peripheral surface of the engraved cylinder.
  • the heliographic printing apparatus also includes a scraping device mounted downstream of the inking device and upstream of the contact zone between the engraved cylinder and the web, where the transfer of the printing takes place. This scraping device comprises a doctor blade extending longitudinally and which is in contact with the peripheral surface of the engraved cylinder, in order to remove the excess ink present on the engraved peripheral surface, before the printing operation.
  • the doctor blade is mounted on a support which is driven by an oscillating movement parallel to the longitudinal axis of the engraved cylinder.
  • the means which are generally used to cause the longitudinal oscillating movement of the doctor blade are of the mechanical or pneumatic type and they have a certain number disadvantages. Indeed the mechanical means are relatively complex and they do not lend themselves conveniently to a change of format, which requires a repositioning of the doctor blade in the transverse direction.
  • the pneumatic means they produce a sudden change in the direction of movement, which is detrimental for all of the moving parts.
  • the present invention aims to remedy these drawbacks by providing a scraping device of particularly simple design, considerably facilitating the change of format for relatively smooth operation.
  • this scraping device for a gravure printing apparatus comprising an engraved cylinder driven in rotation about its axis, this scraping device comprising a doctor blade which is parallel to the longitudinal axis of the engraved cylinder and in contact with its surface.
  • a doctor blade holder on which the doctor blade is mounted and which extends parallel to the axis of the engraved cylinder, and means for animating the doctor blade with an axial oscillating movement, parallel to the longitudinal axis of the engraved cylinder is characterized in that the means controlling the axial oscillation movement of the doctor blade comprise a hydraulic receiver with two elements movable relative to each other under the action of a hydraulic fluid under pressure , one of these elements being integral with the movable doctor blade holder while the other element is kept fixed, and a means for controlling, periodically, the application, to the hydraulic receiver, of the hydraulic fluid under pressure, so as to cause an alternating movement of the mobile element of the hydraulic receiver and consequently of the doctor blade, this means being mounted at distance from the hydraulic receiver and connected to
  • Figure 1 is a view partially in elevation and partially in axial section of a scraper device according to the invention.
  • Figure 2 is a cross-sectional view taken along line II-II of Figure 1.
  • the scraper device according to the invention which is shown in FIGS. 1 and 2, is associated with a heliographic printing device represented in a simplified manner by its only engraved cylinder 1, indicated in phantom in FIG. 1, which rotates clockwise in FIG. 2.
  • the scraping device 2 comprises a doctor blade 3 which is parallel to the longitudinal axis of the engraved cylinder 1 and in contact with the peripheral surface of this cylinder, upstream from the area where the transfer of the printing takes place to eliminate the excess ink on this peripheral surface.
  • This doctor blade 3 is held fixed by a support 4 which itself mounted on a doctor blade holder 5 extending parallel to the axis of the engraved cylinder 1.
  • the doctor blade 5 and consequently the doctor blade 3 are moved in an axial oscillation movement parallel to the axis longitudinal of the engraved cylinder 1, as indicated by the arrow f in FIG. 1.
  • the scraper device comprises, for controlling the axial oscillation movement of the doctor blade 5, a hydraulic transmission device designated as a whole by the reference 6.
  • This hydraulic transmission device essentially comprises three main components, to namely a hydraulic transmitter 7, a hydraulic receiver 8 and a hydraulic line 9 ensuring the connection between the hydraulic transmitter 7, mounted remotely on the frame of the device, at any suitable point, and the hydraulic receiver 8 housed preferably inside the doctor blade 5.
  • the hydraulic transmitter 7 and the hydraulic receiver 8 can be constituted by any hydraulic movement transmission member and in particular by diaphragm jacks. Each of these jacks, of any type known in the trade, comprises, in the non-limiting embodiment shown in FIG.
  • the doctor blade holder 5 is constituted by a parallelepiped box and the hydraulic receiver 8 is housed coaxially inside the doctor blade holder 5, that is to say that its longitudinal axis merges with that of the doctor blade holder 5.
  • This hydraulic receiver 8 comprises a rod 8a which projects through its left front face and which is connected to the transverse membrane located inside the body 8b of the receiver and subdividing this body in two rooms right and left.
  • the hydraulic connection pipe 9 enters the doctor blade 5, through one of its lateral and longitudinal walls 5a and it is connected to the right side, that is to say to the right chamber of the hydraulic receiver 8 by l 'through a fitting 11.
  • the pipe 9 is also connected to the left side of the hydraulic transmitter 7, via a fitting 12.
  • the body 8b of the hydraulic receiver 8 is fixed to the doctor blade 5 by means of a bracket 13 comprising a wing upper horizontal 13a, fixed to the upper horizontal wall 5b of the doctor blade 5 and a vertical and transverse wing 13b, extending downward, in the doctor blade 5, and traversed by the body 8b of the hydraulic receiver 8.
  • doctor blade 5 In the two opposite end parts of the doctor blade 5, are fixed two blocks 14,15 which are slidably mounted on respective coaxial support shafts 16,17 carried by the frame of the device. The doctor blade 5 can thus slide alternately, in the direction of the arrow f , on the two opposite support shafts 16, 17.
  • the left support shaft 16 serves as an axial support for the rod 8a of the hydraulic receiver 8.
  • the end of the rod 8a is screwed into an intermediate bell-shaped element 18 containing inside a ball bearing 19, which is in axial support, on the left side, against a sleeve 21 terminated, at its left end, by an external flange 22.
  • the sleeve 21 and its flange 22 are held in abutment, on the left side, against a shoulder of the support shaft 16 and the ball bearing 19 is immobilized between the right end of the sleeve 21 and a circlip engaged in a groove provided at the end of the support shaft 16.
  • a compression spring 23 is wound around the support shaft 16 and it bears, at its right end, on the flange 22 of the sleeve 21 and, at its left end, on the right front face of the block 14 sliding on the support shaft 16.
  • the assembly of the doctor blade 5 and the doctor blade 3 can pivot around its longitudinal axis, in order to be able to disengage the doctor blade 3 from the peripheral surface of the engraved cylinder 1.
  • the means controlling the axial oscillation movement of the doctor blade 5 are of the hydraulic transmission type, comprising in particular the flexible pipe 9, it can be seen that the doctor device 2 lends itself very well to a change of adjustment of its position, with a view to adapting it to a cylinder of different format, as indicated for example in phantom in FIG. 2.
  • the hydraulic transmission device uses single-acting diaphragm cylinders
  • a double-acting cylinder could also be used, as a receiver or a hydraulic motor. which would eliminate the need to provide the return spring 23.
  • the rod (or the body) of the jack would be integral with the doctor blade
  • the body (or the rod) of the jack would be connected to a fixed point of the frame and a distribution valve, connected to a source of pressurized oil, would control the supply of the cylinder in both directions, by being connected to the two chambers of the cylinder via two respective pipes passing through a wall of the doctor blade holder 5.
  • a distribution valve connected to a source of pressurized oil
  • this receiver could also be arranged outside this doctor blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP94400634A 1993-03-24 1994-03-24 Rakelvorrichtung für eine Tiefdruckmaschine Withdrawn EP0616887A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9303397A FR2702995B1 (fr) 1993-03-24 1993-03-24 Dispositif de raclage pour un appareil d'impression héliographique.
FR9303397 1993-03-24

Publications (1)

Publication Number Publication Date
EP0616887A1 true EP0616887A1 (de) 1994-09-28

Family

ID=9445302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400634A Withdrawn EP0616887A1 (de) 1993-03-24 1994-03-24 Rakelvorrichtung für eine Tiefdruckmaschine

Country Status (2)

Country Link
EP (1) EP0616887A1 (de)
FR (1) FR2702995B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918700A1 (de) * 1999-04-26 2000-11-02 Mueller Weingarten Maschf Hydromechanischer Pressenantrieb
CN106696458A (zh) * 2016-12-12 2017-05-24 泉州市西格玛智能工业机械有限公司 一种布匹印刷流水线的印刷部分

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230503A (en) * 1939-01-27 1941-02-04 Wood Newspaper Mach Corp Vibration motion for inking systems
US2447090A (en) * 1944-01-14 1948-08-17 Goss Printing Press Co Ltd Rotary intaglio printing press
CH343982A (de) * 1955-02-18 1960-01-15 Hedemora Verkstaeder Ab Vorrichtung zum Hin- und Herbewegen von Rakeln an Tiefdruckmaschinen
US3143067A (en) * 1962-01-08 1964-08-04 Inta Roto Machine Company Inc Doctor bar mechanism
EP0453847A1 (de) * 1990-04-23 1991-10-30 Bobst S.A. Vorrichtung zur axialen Verschiebung von Walzen in einer Druckmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230503A (en) * 1939-01-27 1941-02-04 Wood Newspaper Mach Corp Vibration motion for inking systems
US2447090A (en) * 1944-01-14 1948-08-17 Goss Printing Press Co Ltd Rotary intaglio printing press
CH343982A (de) * 1955-02-18 1960-01-15 Hedemora Verkstaeder Ab Vorrichtung zum Hin- und Herbewegen von Rakeln an Tiefdruckmaschinen
US3143067A (en) * 1962-01-08 1964-08-04 Inta Roto Machine Company Inc Doctor bar mechanism
EP0453847A1 (de) * 1990-04-23 1991-10-30 Bobst S.A. Vorrichtung zur axialen Verschiebung von Walzen in einer Druckmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918700A1 (de) * 1999-04-26 2000-11-02 Mueller Weingarten Maschf Hydromechanischer Pressenantrieb
CN106696458A (zh) * 2016-12-12 2017-05-24 泉州市西格玛智能工业机械有限公司 一种布匹印刷流水线的印刷部分

Also Published As

Publication number Publication date
FR2702995A1 (fr) 1994-09-30
FR2702995B1 (fr) 1995-05-05

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