EP0047618B1 - A rotogravure printing press - Google Patents

A rotogravure printing press Download PDF

Info

Publication number
EP0047618B1
EP0047618B1 EP81303972A EP81303972A EP0047618B1 EP 0047618 B1 EP0047618 B1 EP 0047618B1 EP 81303972 A EP81303972 A EP 81303972A EP 81303972 A EP81303972 A EP 81303972A EP 0047618 B1 EP0047618 B1 EP 0047618B1
Authority
EP
European Patent Office
Prior art keywords
blade
ink
doctor blade
printing member
pivoted
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
EP81303972A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0047618A1 (en
Inventor
Peter Charles Pugsley
David Walter Parkins
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.)
Crosfield Electronics Ltd
Original Assignee
Crosfield Electronics 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 Crosfield Electronics Ltd filed Critical Crosfield Electronics Ltd
Publication of EP0047618A1 publication Critical patent/EP0047618A1/en
Application granted granted Critical
Publication of EP0047618B1 publication Critical patent/EP0047618B1/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
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/061—Inking devices
    • B41F9/065—Using inking rails

Definitions

  • This invention relates to a rotogravure printing press and, in particular, to an inking assembly for inking the printing member of a rotogravure printing press.
  • a printing member having a cylindrical surface including an ink receiving matrix dips, at its lowermost point into a bath containing ink to coat the printing member with ink and then a doctor blade downstream of the ink bath engages the surface of the printing member to scrape ink off the surface of the printing member and merely leave ink remaining in the ink receiving matrix.
  • the ink used with a conventional rotogravure press is thin and very fluid, and the ink bath and doctor blade assembly occupy an arc of about 120° around the bottom of the printing member. This arrangement is satisfactory especially when the printing member has a continuous cylindrical surface.
  • the printing member When the printing member is in the form of a cylindrical plate, this is fixed to a generally cylindrical substrate by grippers or clamps which fix the plate in position on the substrate.
  • the doctor blade has to be lifted off the surface of the printing member during each revolution of the printing member so that it does not contact the grippers or clamps.
  • the grippers or clamps are dipped into the ink bath on each revolution, this covers them with ink which makes their subsequent release difficult and very messy and also, because excess ink is not removed from this region by the doctor blade, the ink from this region tends to be thrown about by the rotary movement of the printing member.
  • a rotogravure printing press includes a printing member having a cylindrical surface including an ink receiving matrix which extends at least partly therearound and at least one inking assembly including a doctor blade to remove surplus ink from the surface of the printing member, and means to move the doctor blade into and out of contact with the surface of the printing member, characterised in that the doctor blade forms one side of an ink channel which extends in the axial direction of and which opens towards the printing member, the ink channel being divided by a blade into an ink supply side and a drain side, the blade being pivoted around an axis extending parallel to the axis of the printing member, and means to rotate the pivoted blade abouts its axis, rotation of the pivoted blade in one sense allowing ink to flow from the ink supply side between the pivoted blade and the doctor blade to flood the ink receiving matrix of the printing member and rotation of the pivoted blade in the opposite sense causing the pivoted blade to seat against the doctor blade to shut off the flow of ink, excess ink flowing over the blade
  • the ink channel and doctor blade are pivoted in said opposite sense about an axis parallel to the axis of the printing member to move the doctor blade away from the printing member.
  • the inking assembly preferably includes resilient means to bias the ink channel and doctor blade for rotation in said one sense to provide predetermined contact pressure between the doctor blade and the surface of the printing member, further rotation of the pivoted blade in said other sense after it has seated against the doctor blade causing the ink channel and doctor blade assembly to pivot about its axis against the bias of the resilient means to move the doctor blade away from the surface of the printing member.
  • the means to move the pivoted blade and the means to move the doctor blade are largely common.
  • the ink channel includes a containing blade forming its other side, the containing blade bearing against, or being arranged close to the surface of the printing member.
  • Ink may flow into the drain side under gravity but preferably the press includes a vacuum source coupled to the drain side to draw any excess ink that flows over the top of the pivoted blade down into a drain outlet.
  • the ink from the drain side is preferably returned to an ink reservoir forming part of an ink supply system.
  • the vacuum that is applied to the drain side in use causes a flow of air to take place past the top edge of the containing blade and this keeps the top edge of the containing blade clean whilst the containing blade also prevents any spray or spatter of ink from leaving the ink channel and contaminating any other parts of the apparatus.
  • the containing blade is located so that when the ink channel and doctor blade pivot to move the doctor blade away from the surface of the printing member the containing blade also moves away from the printing member.
  • the quantity of ink exposed to the atmosphere and the time for which it is exposed are both greatly reduced, as compared with previous systems, which leads to a great reduction in the evaporation of the ink solvent and a great reduction in the consequent problems that are caused. It also reduces considerably the quantity of ink thrown about and the quantity that comes into contact with the plate grippers or clamps.
  • the means are arranged to shut off the ink and move the doctor blade out of contact with the printing member once during each revolution of the printing member.
  • the printing member is a gravure plate
  • the blade shuts off the supply of ink and the doctor blade is moved out of contact with the surface of the gravure plate and the blade moves to restore the ink supply just after the leading end of the plate and just before the leading end of the ink receiving matrix passes the doctor blade on each revolution of the plate.
  • the ink receiving matrix of the printing member includes two or more different colour separations.
  • the pivoted blade and the doctor blade of each inking assembly are arranged to move once during each revolution of the printing member with the timing of the movement being such that each inking assembly only applies ink to the ink receiving matrix corresponding to the colour separation for the ink contained in that inking assembly.
  • a printing member 1 of the press is formed as a partly cylindrical body with a cylindrical gravure plate having an ink receiving matrix engraved into its cylindrical surface and fixed to it by clamps (not shown).
  • the principal difference between this example and a conventional plate-gravure press lies in the construction and arrangement of the inking assembly and only this part will be described in detail.
  • the inking assembly comprises a doctor blade assembly 2, an ink channel 3, a pivoted blade 4 which divides the ink channel 3 into an ink supply side and a drain side, and a containing blade 5.
  • the doctor blade assembly 2 is conventional in construction and comprises a pair of spring steel blades 6 and 7 inclined towards and bearing against one another. The spring steel blades 6 and 7 are clamped onto and define the downstream side wall of the ink channel 3.
  • the pivoted blade 4 has a seating surface 8 along its free edge which, in one position of the pivoted blade 4 bears against and seals against the strip 6 of the doctor blade.
  • the containing blade 5 is made from nylon or other plastics material and is arranged to be a distance of substantially 1 mm away from the surface of the printing member when the doctor blade 6 is in engagement with the printing member 1.
  • the containing blade 5 forms the upstream edge of the ink channel 3.
  • a strip of rubber or other elastomeric material 9 is sandwiched between the upstream side of the pivoted blade 4 and the side of the ink channel 3 to form a seal to prevent ink from the ink supply side of the ink channel 3 passing upwards on the drain side of the pivoted blade 4.
  • Ink is pumped into the ink channel 3 through an inlet 10 via a pump 11 from a reservoir 12.
  • the ink channel 3 together with the doctor blade assembly 2 rotates about the pivot axis of the blade 4 which is parallel to the axis of the printing member 1.
  • An arm 13 is connected to the ink channel 3 and connected to a frame 14 attached rigidly to and forming part of the main framework of the press by a spring 15 connected to a link 16 with a screw threaded adjuster to adjust the loading applied to the spring 15.
  • the spring 15 and the arm 13 urge the ink channel 3 to rotate about its axis in a clockwise direction as seen in Figure 2, to urge the doctor blade 6 against the surface of the printing member 1 with a predetermined pressure.
  • the pivoted blade 4 is connected to a crank arm 18 which is in turn connected to one end of a pneumatic piston and cylinder assembly 19 having its other end connected to the frame 14.
  • Operation of the pneumatic piston and cylinder assembly 19 causes the pivoted blade 14 to pivot.
  • a vacuum generated by a vacuum source 20 is applied to the drain side of the ink channel 3 via an outlet 21 and ink sucked out through the outlet 21 is returned to the ink reservoir 12 via a line 17.
  • the operation of the pneumatic piston and cylinder assembly 19 is synchronised with the rotation of the printing member 1 by a conventional system for removing the doctor blade from a printing member and this conventional system will not be described in detail.
  • the pneumatic piston and cylinder assembly 19 is operated to move the pivoted blade 4 in the clockwise direction as seen in Figure 3.
  • the initial movement of the pivoted blade 4 merely allows the ink channel 3 to rotate about its axis under the bias of the spring 15 until the doctor blade 6 engages the surface of the printing member 1.
  • Further movement of the pivoted blade 4 by the pneumatic piston and cylinder assembly 19 causes the seating surface 8 of the pivoted blade 4 to unseat from the face of the doctor blade 6 to allow ink to flow from the ink supply side of the ink channel 3 to flood the surface of the printing member 1 with ink. This is the position of the pivoted blade 4 shown in Figure 3.
  • a vacuum from the source 20 is continuously applied to the upstream side of the pivoted blade 4 and therefore any ink flowing over the upper edge of the pivoted blade 4 is sucked by the vacuum down the drain side of the pivoted blade 4, through the vacuum outlet 21 and returned to the reservoir 12.
  • the vacuum applied via the outlet 21 draws air over the upper edge of the containing blade 5 to keep this upper edge of the containing blade 5 clean and prevents ink from being released outside the ink channel 3.
  • the pneumatic piston and cylinder assembly 19 is again operated to urge the pivoted blade 4 in the anti-clockwise direction as seen in Figure 2 so that the seating surface 8 on the pivoted blade 4 engages the doctor blade 6 to cut off the supply of ink from the ink channel 3 just as the trailing end of the ink receiving matrix passes the doctor blade 6.
  • the vacuum applied via the connection 21 draws the remaining ink down the drain side of the pivoted blade 4 and, further movement of the pneumatic piston and cylinder assembly 19 and the pivoted blade 4 acting on the doctor blade 6 causes the entire inking channel 3 to rotate about its axis against the bias of the spring 15 just as the trailing edge of the gravure plate 1 approaches the doctor blade 6.
  • This rotation takes the doctor blade 6 out of contact with the surface of the printing member 1 and the vacuum applied to the outlet 21 draws air over the top edge of the doctor blade 6 to carry with it any ink adjacent the upper edge of the doctor blade 6 and so keep the top edge of the doctor blade 6 clean and prevent any smearing of the ink on the surface of the printing member 1.
  • the rotation of the ink channel 3 not only removes the doctor blade 6 from the surface of the printing member 1 but also moves the containing blade 5 further away from the surface of the printing member 1.
  • the ink flow of the ink inlet 10 may be controlled by a valve between the ink inlet 10 and the pump 11 or by controlling the action of the pump 11, in addition to the action of the seating surface 8 of the pivoted blade 4 on the doctor blade 6 if this is required.
  • the printing member includes either four separate partly cylindrical gravure printing plates, each of which corresponds to a different colour separation of the same image or, preferably, the cylindrical surface of the printing member 1 has an ink receiving matrix engraved on it which comprises the four separate colour separations of the same image.
  • the press also includes four inking assemblies each of which is substantially identical to the inking assembly of the first example described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP81303972A 1980-09-03 1981-09-01 A rotogravure printing press Expired EP0047618B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8028366 1980-09-03
GB8028366 1980-09-03

Publications (2)

Publication Number Publication Date
EP0047618A1 EP0047618A1 (en) 1982-03-17
EP0047618B1 true EP0047618B1 (en) 1984-08-22

Family

ID=10515798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303972A Expired EP0047618B1 (en) 1980-09-03 1981-09-01 A rotogravure printing press

Country Status (3)

Country Link
EP (1) EP0047618B1 (enrdf_load_stackoverflow)
JP (1) JPS5775860A (enrdf_load_stackoverflow)
DE (1) DE3165687D1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9109785U1 (de) * 1991-08-07 1992-09-17 J.M. Voith Gmbh, 7920 Heidenheim Rakelvorrichtung mit Rakelbalken
DE4339939A1 (de) * 1993-11-24 1995-06-08 Robert Wagner Vorrichtung zur Zufuhr von Druckfarbe in das Farbwerk einer Druckmaschine
DE4117390C2 (de) * 1991-05-28 2003-11-06 Koenig & Bauer Ag Rakelbalken für ein Farbwerk einer Rotationsdruckmaschine

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8510049D0 (en) * 1985-04-19 1985-05-30 Observer Ltd Printing press
DE4118426A1 (de) * 1991-06-05 1992-12-10 Koenig & Bauer Ag Kammerrakel fuer ein farbwerk einer rotationsdruckmaschine
US5676689A (en) * 1991-11-08 1997-10-14 Kensey Nash Corporation Hemostatic puncture closure system including vessel location device and method of use
FR2689451B1 (fr) * 1992-04-03 1997-01-17 Komori Chambon Dispositif d'encrage pour un appareil d'impression heliographique.
US5791248A (en) * 1997-03-27 1998-08-11 Paper Converting Machine Company Liquid supply unit for roll applicator and method
DE10028479A1 (de) * 2000-06-08 2001-12-13 Roland Man Druckmasch Kammerrakel
US8961541B2 (en) 2007-12-03 2015-02-24 Cardio Vascular Technologies Inc. Vascular closure devices, systems, and methods of use
US8992567B1 (en) 2001-04-24 2015-03-31 Cardiovascular Technologies Inc. Compressible, deformable, or deflectable tissue closure devices and method of manufacture
US20080109030A1 (en) 2001-04-24 2008-05-08 Houser Russell A Arteriotomy closure devices and techniques
CN102458264B (zh) 2009-04-09 2015-04-22 心血管科技股份有限公司 组织封闭装置、输送装置和系统、用于其的套件和方法
EP4040085B1 (en) * 2019-09-30 2024-06-05 Daikin Industries, Ltd. Refrigeration cycle device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085672A (en) * 1975-09-11 1978-04-25 John Grosart Inking device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117390C2 (de) * 1991-05-28 2003-11-06 Koenig & Bauer Ag Rakelbalken für ein Farbwerk einer Rotationsdruckmaschine
DE9109785U1 (de) * 1991-08-07 1992-09-17 J.M. Voith Gmbh, 7920 Heidenheim Rakelvorrichtung mit Rakelbalken
DE4339939A1 (de) * 1993-11-24 1995-06-08 Robert Wagner Vorrichtung zur Zufuhr von Druckfarbe in das Farbwerk einer Druckmaschine

Also Published As

Publication number Publication date
JPH0214901B2 (enrdf_load_stackoverflow) 1990-04-10
DE3165687D1 (en) 1984-09-27
JPS5775860A (en) 1982-05-12
EP0047618A1 (en) 1982-03-17

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