EP2657020B1 - Ensemble de lame de racloir articulée pour groupes d'impression - Google Patents

Ensemble de lame de racloir articulée pour groupes d'impression Download PDF

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Publication number
EP2657020B1
EP2657020B1 EP20120425078 EP12425078A EP2657020B1 EP 2657020 B1 EP2657020 B1 EP 2657020B1 EP 20120425078 EP20120425078 EP 20120425078 EP 12425078 A EP12425078 A EP 12425078A EP 2657020 B1 EP2657020 B1 EP 2657020B1
Authority
EP
European Patent Office
Prior art keywords
levers
doctor blade
lever
blade assembly
pair
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.)
Not-in-force
Application number
EP20120425078
Other languages
German (de)
English (en)
Other versions
EP2657020A1 (fr
Inventor
Renzo Melotti
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.)
Bobst Italia SpA
Original Assignee
Bobst Italia SpA
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 Bobst Italia SpA filed Critical Bobst Italia SpA
Priority to EP20120425078 priority Critical patent/EP2657020B1/fr
Publication of EP2657020A1 publication Critical patent/EP2657020A1/fr
Application granted granted Critical
Publication of EP2657020B1 publication Critical patent/EP2657020B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41F9/1072—Blade construction
    • 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
    • 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
    • B41F9/1027—Tripping devices
    • 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
    • B41F9/1036—Clamping and adjusting devices
    • B41F9/1045—Clamping and adjusting devices using fluid pressure

Definitions

  • the present invention relates to a doctor blade assembly for use with rotating print cylinders, in particular print cylinders of gravure or rotogravure printing presses.
  • Doctor blades are known in the field of printing apparatuses, in particular rotogravure printing presses in which a gravure printing roller applies ink or the like onto a film or web material to be printed, such as a packaging material.
  • the doctor blade is arranged adjacent and substantially parallel to the rotation axis of the printing roller, which is typically graved according to the graphics or patterns to be printed onto the material.
  • a pan containing the ink or other substances to be applied to the material is usually provided beneath the printing roller, in such a position that the printing roller can be wet by the ink or the substance in the pan during its rotation.
  • the material to be printed is generally fed to the printing roller by a pressing roller, which is in close proximity of the printing roller so that the material can contact a generating line of the printing roller downstream of the ink pan and can be printed according to the patterns engraved on the printing roller.
  • the doctor blade is placed downstream of the ink pan and upstream of the pressing roller, with respect to the rotation direction of the printing roller, and is aimed at wiping off the excess ink from the engraved surface of the printing roller before it contacts the material to be printed, so that the ink remains only in the patterned recesses engraved on the surface of the printing roller.
  • US 3780670A describes a doctor blade assembly for holding a doctor blade which wipes excess ink from an etched or engraved ink applicator roll in a printing press, enables the blade to be moved to a variety of positions with respect to the roll, imparts a reciprocating motion to the blade, enables skew adjustment of the blade, and clamps the blade in a convenient position to facilitate its replacement.
  • DE 4024569A1 describes a wiper unit for removing excess printing ink, which comprises an arc-shaped rail extending along circular line around axis of printing machine platen cylinder.
  • the aim of the present invention is to realize an articulated doctor blade assembly for printing groups which allows to accelerate the operation of setting to have the doctor blade in contact with the printing roller and parallel to the axis of this last one, with consequent reduction of the time to set the doctor blade and increasing of the useful printing time and allows to maintain a contact angle almost constant in a accepted tolerance range, with consequent improvement of the quality print of the entire rotary printing unit.
  • the present articulated doctor blade assembly allows the mounting of a chambered doctor blade support or a non-chambered doctor blade support.
  • Another feature of the present invention is to allow the assembly to be installed and used in existing rotary printing presses, in particular gravure and rotogravure printing presses without substantially changing their mechanical structure and their operating software.
  • the present invention allows to facilitate the operations of setting of the doctor blade assembly in the possible positions in accord to the printing process phases.
  • FIGS 1 and 2 show a rotogravure printing unit 100 incorporating an articulated doctor blade assembly 110 according to the present invention.
  • the rotogravure printing unit 100 comprises a support frame 7 wherein at least one gravure printing roller 4 and a pressing roller 10 are rotatably mounted and an ink tank 8 cooperating with pumping means 9 able to transfer the ink from said tank 8 to the printing roller 4.
  • a pan 5 for collecting ink is positioned under the printing roller 4.
  • the rotogravure printing unit 100 also comprises two pistons 6A and 6B located on the top of the support frame 7 and able to actuate, via the two piston stems, the pressure roller 10 towards the printing roller 4.
  • the gravure printing roller 4 is characterized by an engraved cylindrical surface, by means of which ink can be entrapped and transferred to a film or web material pressed by the pressing roller 10.
  • the gravure printing roller 4 can be easily disassembled from the unit 100 and replaced by a gravure printing roller having a different diameter and/or different patterns engraved on its surface.
  • the pressing roller 10 is linearly movable with respect to the longitudinal rotation axis of the gravure printing roller 4, so as to be adapted to printing rollers of different diameters and to press the film or web material against the engraved surface of the printing roller 4.
  • the articulated doctor blade assembly 110 is connected to the support structure 7 of the printing unit 100 via a bush 22 and a flexible plate 24.
  • the articulated doctor blade assembly 110 comprises: a doctor blade 1, a doctor blade support 2, a main shaft 14 and a secondary shaft 15.
  • the principal shaft 14 is able to be rotated by means of a first gear reduction 18A driven by a hand wheel 12 provided with a graduated scale 20A
  • the secondary shaft 15 is able to be rotated by means of a second gear reduction 18B driven by a hand wheel 13 provided with a graduated scale 20B.
  • the articulated doctor blade assembly 110 also comprises a levers group 3, comprising the levers 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H and a pair of pneumatic pistons 11A and 11B, which are controlled semi-automatically by a suitable software and that control will not be discussed here.
  • These pneumatic pistons 11A and 11B are able to carry out the final approach of the doctor blade 1 on the cylindrical surface of the printing cylinder 4.
  • the lever 3B is keyed near an end of the main shaft 14 through a hole in its central zone; at its lower end a spacer 23B is fixed while the upper end is keyed to the secondary shaft 15.
  • the lever 3A is keyed near the other end of the main shaft 14 through a hole in its central zone; at its lower end is fixed a spacer 23A while the upper end is keyed to the secondary shaft 15.
  • the lever 3C is characterized by a substantially "L" shape and is keyed to the secondary shaft 15 thanks to a hole at one end thereof.
  • the lever 3D is similar to the lever 3C and it is keyed on the secondary shaft 15 at the opposite end respect to lever 3C.
  • the lever 3C is mounted near the lever 3A and forms with it, thanks to their possible rotation around the secondary shaft 15, a first leverism 3AC.
  • the lever 3D is mounted near the lever 3B and forms with it, thanks to their possible rotation around the secondary shaft 15, a second leverism 3BD.
  • the levers 3C and 3D are also connected to the lever 3H by means of a rotation pin 16.
  • the levers 3H and 3G form a support pallet 3GH for the support group 2 and therefore for the doctor blade 1.
  • This support pallet 3GH can be rotated around two rotation pins 16 and 17.
  • the piston 11A is fixed to one end to the pin 23A and to the other end to the lever 3C. Therefore a third articulated leverism 3AC11A composed by the leverism 3AC and piston 11A is formed.
  • the piston 11B forms a fourth articulated leverism 3BD11B with the leverism 3BD.
  • the lever 3F is keyed on the center of the secondary shaft 15 and at one end is connected to the lever 3E via a rotation pin 21.
  • the lever 3E is connected, at the other end and by means of the rotation pin 17, to the pallet 3GH; this last one is united with the doctor blade support 2.
  • the levers 3F, 3E, 3G, 3H form a further articulated leverism.
  • Said levers group 3 is connected to a casing group 19 formed by four mechanically deformable plates 19A, 19B, 19C and 19D.
  • the plate 19A is connected to the levers 3A and 3B, while the plate 19B is connected to the levers 3C and 3D.
  • Said levers group 3 comprising the various levers 3A-3H with the respective connections described above forms an articulated parallelogram which, advantageously, allows to control and drive in an accurate way the movement of the doctor blade 1 in respect to any printing roller of a rotogravure printing group 100.
  • the levers 3A and 3C of the first leverism 3AC connected to the piston 11A are substantially independent from the levers 3B and 3D of the second leverism 3BD connected to the piston 11B. This independence of these levers allows the parallel self-alignment of the doctor blade 1 with the rotation axis of the printing cylinder 4 of fig. 1 .
  • the present articulated doctor blade assembly 110 is showed in fig. 6A and 6B in a possible operation mode on a first printing roller 4 and on a second printing roller 4' having a diameter smaller than the diameter of the first roller 4, respectively.
  • a first operation step of the present articulated doctor blade assembly 110 operator sets in motion, by means of the hand wheel 12, the first gear reduction 18A which commands the main shaft 14, thus permitting the rotation of the entire articulated parallelogram formed by the levers 3A-3H of the articulated doctor blade assembly 110 around the main shaft 14 axis.
  • the graduate scale 20A shows quickly to operator the correct position to set the doctor blade assembly in operation position or in extraction position of the pan 5 of Fig. 1 .
  • the operator sets in motion the gear reduction 18B which commands the secondary shaft 15 so as to rotate and to set the doctor blade 1 in the correct work position, that is in contact with the surface of the printing roller 4 of Fig. 6A or the surface of the printing roller 4' of Fig. 6B .
  • the gear reduction 18B changes the contact angle X shown in figures 6A and 6B .
  • the graduate scale 20B shows how many degrees is varying the contact angle X turning the hand wheel 13.
  • the rotation of the lever 3F in the counterclockwise direction around the axis of the secondary shaft 15 brings to rotation the lever 3E in clockwise direction thanks to the pin 21.
  • the lever 3E brings to rotation in the counter-clockwise direction the pallet 3GH composed in part from the lever 3G and from the lever 3H, united the one with the other and rotatable around the pins 16 and 17.
  • the pallet 3GH is united with the doctor blade support 2 that will rotate with it.
  • the last rotation of the doctor blade support 2 causes a reduction of the contact angle X.
  • the setting action on the wheel 13 can be done in two ways:
  • this contact angle X once adjusted, remains substantially constant without any further adjustment, even varying the diameter of the printing cylinder.
  • the parallelogram formed by the levers group 3A-3H in fact, allows to maintain a contact angle X substantially constant with small variations around +/- 1.5 degrees.
  • the pneumatic pistons 11A and 11B are self-adapt thanks to a constant pressure in their interior. These pistons, as above described, are controlled are controlled semi-automatically by a suitable software. The parallelism between the doctor blade 1 and the longitudinal axis of the printing cylinder 4 or 4' remains automatically corrected thanks to the adjustment of the articulated doctor blade assembly 110 when the pistons 11A and 11B are actuated.
  • This further advantageous feature of the articulated doctor blade assembly 110 according to the present invention is enabled by mechanical deformation of the casing group 19.
  • the various plates 19A 19B 19C 19D, that constitute the casing group 19, being deformable, allow a phase shift of the leverism 3AC with respect to the leverism 3BD.
  • the phase shift of the geometries of the leverisms 3AC and 3BD and therefore their substantial reciprocal independence allows to the doctor blade 1 to go in contact on the surface of the roller 4 or 4' little by little reaching the desired parallelism condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Presses (AREA)

Claims (12)

  1. Ensemble de racle (110) convenant à des groupes d'impression, en particulier à des groupes d'impression en rotogravure (100) comprenant une racle (1) et un support de racle (2), comprenant un arbre principal (14) pourvu de moyens relatifs d'entraînement et de commande (12, 18A), un arbre secondaire (15) pourvu de moyens relatifs d'entraînement et de commande (13, 18B) ainsi qu'un groupe de leviers (3) formant un parallélogramme articulé et comprenant :
    - une première série de leviers (3A, 3B, 3C, 3D) pourvus d'une première paire de leviers parallèles (3A, 3B) clavetés d'un côté à l'arbre principal (14) et de l'autre côté à l'arbre secondaire (15), et caractérisé en ce que la première série de leviers est pourvue d'une seconde paire de leviers parallèles (3C, 3D) clavetés d'un côté audit arbre secondaire (15) et raccordés de l'autre côté en mode rotatif et au moyen d'une broche de rotation (16) à un autre levier (3H) sensiblement parallèle audit arbre principal (14) ; et caractérisé en outre en ce que le groupe de levier comprend en outre :
    - une seconde série de leviers (3F, 3E, 3G, 3H) pourvus d'un premier levier (3F) claveté d'un côté à l'arbre secondaire (15) et raccordé de l'autre côté et au moyen d'une broche de rotation (21) à un deuxième levier (3E), ledit deuxième levier étant raccordé au moyen d'une broche de rotation (17) à un troisième levier (3G) raccordé audit autre levier (3H) de manière à former une palette de support (3GH) à laquelle le support de racle (2) est fixé, au moins un levier (3H) de ladite seconde série de leviers étant raccordée en mode rotatif à au moins une paire de leviers (3C, 3D) de ladite première série de leviers (3A, 3B, 3C, 3D).
  2. Ensemble de racle (110) selon la revendication 1, caractérisé en ce qu'il comprend un groupe de chemisage (19) pourvu d'une série d'éléments mécaniquement déformables (19A, 19B, 19C, 19D) raccordés au moins aux leviers de ladite première série de leviers (3A, 3B, 3C, 3D).
  3. Ensemble de racle (110) selon la revendication 1, caractérisé en ce que ladite première paire de leviers (3A, 3B) est clavetée des deux côtés de l'arbre principal (14) et ladite seconde paire de leviers (3C, 3D) est clavetée des deux côtés de l'arbre secondaire (15), chaque levier de ladite seconde paire de leviers (3C, 3D) étant montée près d'un levier respectif de ladite première paire de leviers (3A, 3B).
  4. Ensemble de racle (110) selon la revendication 3, caractérisé en ce qu'il comprend une paire de pistons (11A, 11B), dont chacun est raccordé, à une extrémité, à un levier respectif (3A, 3B) de ladite première paire de leviers et, à l'autre extrémité, à un levier respectif (3C, 3D) de ladite seconde paire de leviers.
  5. Ensemble de racle (110) selon la revendication 4, caractérisé en ce qu'il comprend un système de leviers articulés (3A3C11A, 3B3D11D) formé par chaque piston (11A, 11B) raccordé aux leviers respectifs de ladite première paire de leviers
    (3A, 3B) et de ladite seconde paire de leviers (3C, 3D).
  6. Ensemble de racle (110) selon la revendication 1, caractérisé en ce que lesdits leviers de ladite seconde série de leviers (3F, 3E, 3G, 3H) sont raccordés l'un à l'autre de manière former un système de leviers articulés.
  7. Ensemble de racle (110) selon la revendication 1, caractérisé en ce que ledit premier levier (3F) est raccordé en mode rotatif audit deuxième levier (3E).
  8. Ensemble de racle (110) selon la revendication 7, caractérisé en ce que ledit premier levier (3F) est claveté à l'arbre secondaire (15) en position sensiblement centrale.
  9. Ensemble de racle (110) selon la revendication 1, caractérisé en ce que ledit arbre principal (14) est commandé par un réducteur à engrenage (18A) commandé par un volant (12).
  10. Ensemble de racle (110) selon la revendication 1, caractérisé en ce que ledit arbre secondaire (15) est commande par un réducteur à engrenage (18B) commandé par un volant (13).
  11. Ensemble de racle (110) selon la revendication 2, caractérisé en ce que le groupe de chemisage (19) comprend au moins deux éléments mécaniquement déformables (19A) raccordés à ladite première paire de leviers (3A, 3B) et au moins deux éléments mécaniquement déformables (19B) raccordés à ladite seconde paire de leviers (3C, 3D).
  12. Groupe d'impression en rotogravure (100) comprenant au moins un cylindre d'impression (4, 4') et au moins un galet presseur (10) adjacent au cylindre d'impression (4, 4'), caractérisé en ce qu'il comprend un ensemble de racle articulé (110) selon une ou plusieurs des revendications précédentes.
EP20120425078 2012-04-27 2012-04-27 Ensemble de lame de racloir articulée pour groupes d'impression Not-in-force EP2657020B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20120425078 EP2657020B1 (fr) 2012-04-27 2012-04-27 Ensemble de lame de racloir articulée pour groupes d'impression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120425078 EP2657020B1 (fr) 2012-04-27 2012-04-27 Ensemble de lame de racloir articulée pour groupes d'impression

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Publication Number Publication Date
EP2657020A1 EP2657020A1 (fr) 2013-10-30
EP2657020B1 true EP2657020B1 (fr) 2014-10-29

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017182144A1 (fr) * 2016-04-22 2017-10-26 Bobst Italia S.P.A. Ensemble de racle avec support dans une unité d'impression par rotogravure
CN108394179A (zh) * 2018-03-14 2018-08-14 浙江寿原机械有限公司 一种油墨机的印刷装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780670A (en) * 1972-08-07 1973-12-25 Faustel Inc Doctor blade assembly
JPH07102669B2 (ja) * 1990-03-28 1995-11-08 中島精機エンジニアリング株式会社 ドクター装置

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Publication number Publication date
EP2657020A1 (fr) 2013-10-30

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