EP2139683B1 - Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure - Google Patents

Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure Download PDF

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Publication number
EP2139683B1
EP2139683B1 EP08734819A EP08734819A EP2139683B1 EP 2139683 B1 EP2139683 B1 EP 2139683B1 EP 08734819 A EP08734819 A EP 08734819A EP 08734819 A EP08734819 A EP 08734819A EP 2139683 B1 EP2139683 B1 EP 2139683B1
Authority
EP
European Patent Office
Prior art keywords
blade
doctor blade
cylinder
peripheral surface
engraved cylinder
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.)
Active
Application number
EP08734819A
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German (de)
English (en)
French (fr)
Other versions
EP2139683A1 (fr
Inventor
Pierre Robadey
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 Mex SA
Original Assignee
Bobst SA
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Filing date
Publication date
Application filed by Bobst SA filed Critical Bobst SA
Priority to EP08734819A priority Critical patent/EP2139683B1/fr
Publication of EP2139683A1 publication Critical patent/EP2139683A1/fr
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Publication of EP2139683B1 publication Critical patent/EP2139683B1/fr
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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 squeegee system, provided with a squeegee.
  • the invention also relates to a printing unit equipped with a doctor blade system.
  • the invention finally relates to a gravure printing machine, incorporating at least one printing unit.
  • Photogravure also called rotogravure
  • rotogravure is a rotary printing process that can be used for many substrates, including paper or cardboard, using engraved cylinders. Gravure printing is used especially for high-quality editions and large prints where graphics must play an important role in promoting a product, such as a carton pack. This printing process makes it possible in one pass to print up to ten colors, with solvent, water or other inks; to print matt, glossy or structured varnishes; print on front and / or back and emboss.
  • a medium to be printed in the form of a continuous strip passes through a succession of gravure printing units.
  • the printing units are assembled and arranged one after the other from the input of the print medium upstream to its output downstream.
  • Each printing group proceeds to print a pattern with a single specific color or a particular varnish, or even embossing.
  • the principle in gravure is to engrave, on the periphery of a printing cylinder, cells that reproduce the pattern that you want to print.
  • the engraved cylinder rotated is coated with ink by an applicator and rotates inside a tank containing the ink, which allows to fill the cells.
  • the printing medium is then strongly applied against the engraved cylinder, so that the ink contained in the cells can be extracted and transferred onto the medium to be printed.
  • the squeegee system provides a constant print quality, ensuring control of the amount of ink contained in the cells.
  • the blade is brought into contact with the surface of the cylinder at a line immediately preceding, following the direction of rotation of the cylinder, the zone in which the cylinder comes to contact the medium to be printed.
  • the blade is subjected to a movement back and forth on the surface of the cylinder, in the direction parallel to the axis of revolution of the cylinder.
  • the angle formed by the plane of the blade with the surface of the cylinder also known as the angle of attack, is important to avoid vibrations of the blade or to prevent ink streaks.
  • the contact pressure of the blade on the cylinder must also be adjusted, to allow the contact surface of the edge of the blade against the cylinder, as well as the angle of attack, to remain constant.
  • the cylinder for gravure printing has dimensions and a very large weight which cause, on the one hand, transport difficulties, and on the other hand, positioning difficulties.
  • the cylinder-tank group is removed by the removable printer carriage, which facilitates its handling and its permutation, as described for example in the document FR-2.539.325 .
  • a device for use in gravure printing which comprises a doctor blade holder.
  • Means for balancing the pressure of the blade are provided and incorporate two lateral support rods on each of which is embedded a spring, coming to rest against the doctor blade support, and adjusting elements of the hardness of the springs.
  • the squeegee support, and thus the squeegee are also provided for pivoting, with respect to a central axis, passing through the squeegee support and perpendicular to the plane formed by the blade. A shaving of the printing surface is achieved with minimal wear of the blade, the squeegee pressure remaining guaranteed at all points along the squeegee.
  • the document EP-0.765.745 discloses a cleaning device, used in gravure printing, which comprises a doctor blade that can follow the movement of a cleaning roller by means of a cam link mechanism.
  • a carrier is secured with pins passing through elongated holes.
  • a hydraulic cylinder is attached to the carrier, and an actuating portion of the hydraulic cylinder is connected to the doctor support. By actuation of the hydraulic cylinder, the squeegee carrier moves relative to the carrier, with elongated lumens, allowing the doctor blade holder to move forward and backward with respect to the roller independently.
  • the connecting mechanism to follow the movement of the cleaning roller is essential to ensure that the blade comes touching the surface to be wiped. Since this linking mechanism is linked together Laterally with respect to the cylinder and the hydraulic cylinder is attached laterally to the carrier, the contact between the doctor blade and the surface will be very localized at a single point. In addition, the elongated lights limit the movements of the doctor blade support.
  • the document EP-0.422.344 discloses a doctor blade device for use with a platen roller for gravure printing.
  • the scraper device comprises a blade, a scraper holder mounted on journals, which are pivotable relative to corresponding lower parts.
  • the lower parts, the squeegee holder and thus the squeegee move back and forth along the cylinder.
  • the lower parts slide in guides towards the cylinder.
  • Air pistons are mechanically connected and press directly on the doctor blade support, so as to slide the lower parts, the doctor blade holder and thus the blade, against the cylinder.
  • the pistons provide a constant pressure, but only when a portion of the blade comes into contact with the peripheral surface of the cylinder.
  • the presence of the trunnions for pivoting causes the thrust of the pistons against the squeegee carrier causes rotational movements of rotation.
  • the back and forth movement also drives each of the pistons.
  • the document GB-2,085,363 discloses a scraper holder attached to a rotatable carrier member in a printing press.
  • the doctor blade is able to move back and forth parallel to the axis of the impression cylinder.
  • the squeegee support is guided in a slide disposed on the carrier element.
  • the support assembly and carrier element is mounted to a sliding guide bar, the latter being able to pivot.
  • the document EP-0.072.554 discloses a drive for reciprocating a doctor blade in a printing press.
  • a doctor blade holder is provided with a slide, which allows it to swing relative to a base frame.
  • the doctor blade is held against the impression cylinder by a pivot connection, which includes a piston unit so as to selectively move the blade away from the cylinder.
  • a main problem to be solved by the invention is to develop a squeegee system for optimal scraping of a peripheral surface of the cylinder.
  • a second problem is to achieve a squeegee system allowing both a back and forth movement of the blade and an optimal scraping efficiency of the blade. cylinder with this same blade.
  • a third problem is that of providing a squeegee system remaining permanently in a printing unit, while ensuring its perfect adaptation to each new cylinder.
  • a fourth problem is to use a squeegee system that is independent of the printer carriage and therefore the cylinder, with several possibilities of adjustment of the squeegee system relative to the cylinder.
  • a fifth problem is to obtain a squeegee system for a printing group, which is both simple and inexpensive to produce. Still another problem is to mount a squeegee system in a gravure printing machine printing unit to provide high print quality.
  • the invention relates to a doctor blade system according to claim 1.
  • the blade of the squeegee system will touch and remain constantly in contact with the cylinder, regardless of the angular positioning of the latter relative to the blade.
  • its straight edge can land on the peripheral surface and remain in abutment along its length, during the complete rotation of the cylinder. If the cylinder has surface defects, wear or mounting inaccuracies, the means present on the squeegee system compensate for the differences, regular or variable, existing or occurring when the cylinder performs a revolution.
  • the fine adjustments of the pressure exerted by the edge of the blade on the peripheral surface of the cylinder are not ensured by the pushing elements.
  • the goal is to maintain a linear contact of the edge of the blade on the surface rotating cylinder device. Such contact will be obtained with each change of cylinder, when new work is requested.
  • the back and forth means are used to prevent localized wear too fast blade, detrimental to the quality of printing.
  • the doctor blade system thus combines for the blade an ability to move freely, until it enters and remains in constant contact with the surface of the cylinder, and an ability to go back and forth at that surface. of this cylinder.
  • the means to ensure a movement back and forth of the blade only move the doctor blade holder and blade, without the thrust elements, which results in a lightening of fast moving parts.
  • the thrust elements generate thrust forces acting on the hub carrier. These forces can be oriented in the plane defined by the blade.
  • the doctor blade system may comprise two thrust elements, which may advantageously be in the form of two springs. These means of applying the thrust to maintain the contact are elastic. These two springs can be arranged laterally, on both sides of the carrier hub, so as to push each side of the carrier hub, towards the peripheral surface of the engraved cylinder.
  • the system may comprise means for compensating a torque induced by the movement of the back and forth of the blade.
  • the torque is induced by the additional degree of freedom imparted to the hub carrier, squeegee support and blade, associated with the reciprocating movement of the doctor carrier and the blade.
  • the means for compensating the torque may comprise a washer, mounted at one end of an axis of rotation of the carrier hub. This axis of rotation allows the adjustment of an angle between the blade and the peripheral surface of the engraved cylinder and constitutes a point of attachment of the carrier hub with the structure.
  • the means for reciprocating the blade may include a pulse finger projecting from the doctor support. This finger can come into contact with pulse means for the back and forth, which are motorized and independent of the doctor blade system.
  • the means for reciprocating the blade may comprise a return spring, positioned between the doctor support and the carrier hub, and providing a free return of the blade. squeegee support, after impulse.
  • a printing unit is characterized in that it is equipped with a doctor blade system having one or more of the technical features described above.
  • a gravure printing machine is characterized in that it comprises at least one printing unit provided with a doctor blade system having one or more of the technical characteristics described above.
  • a gravure printing machine (1) is composed of several printer groups (2 and 3) successively mounted one after the other (only two groups being shown here).
  • the support to be printed (4) returns upstream (Arrow S in Figure 1 ) in the first printing unit (2), to be printed with a first color, spring (S) downstream, then enter (S) upstream in the second printing unit (3), to be printed with a second color, and leaves (S) downstream.
  • the print medium (4) can enter and exit in as many printer groups as necessary to make the different color prints.
  • Each printer unit (2 and 3) comprises a frame (6), a printer carriage (7) inserted in the center of the frame (6), a dryer (8), a pressure roller (9) and a pump (not shown in FIGS. Figures) which provides the ink supply. Due to the routing mechanism of the medium to be printed (4), the first printing unit (2) performs a single-sided printing and the second printing unit (3) performs a back printing of the same medium to be printed (4).
  • the printing carriage (7) comprises (see Figures 1 and 2 ) an engraved cylinder (11) with rotating cells (12) (P-arrow) with respect to its axis of revolution (O) in an ink tank (13), which recovers the overflow of ink (I), and an ink applicator (14), only shown in Figure 2 , powered by the pump.
  • the cells (12) are represented very greatly enlarged in Figure 2 .
  • the medium to be printed (4) is strongly pressed ( Figure 2 ) against the engraved cylinder (11) by the pressure roller (9), so as to carry out a transfer of the ink (I) contained in the cells (12) of the engraved cylinder (11) on the surface of this support (4). ).
  • a squeegee system (16) which in this embodiment is not part of the printer carriage (7), has the function of wiping off the excess ink (I) on the engraved cylinder (11), by means of of a blade (17), visible in Figures 2 and 4 (with dots).
  • the squeegee system (16) is secured to the frame (6) of each printing unit (2 and 3). It should be noted that (see Figure 1 ), in the case of single-sided printing, the squeegee system (16) is provided on the downstream side of the frame (6) of the printing unit (2), and in the case of back printing, the squeegee system (16) ) is provided upstream side of the frame (6) of the printing unit (3).
  • the squeegee system (16) comprises (see Figures 3 and 4 ) a doctor blade support (18), a carrier hub (19) and a structure (21).
  • the blade (17) is inserted into the doctor holder (18), so that its edge (22) protrudes and comes into contact with the engraved cylinder (11).
  • the carrier hub (19) is made with two lateral cheeks (23) connected by a central piece (24).
  • the structure (21) of the squeegee system (16) is formed by two side plates (26) which are fixed on corresponding uprights of the frame (6).
  • the squeegee system (16) comprises adjustment means according to the format, that is to say according to the diameter of the engraved cylinder (11).
  • These format adjustment means comprise a crank (27) meshing a series of pinions (28), to advance (Arrow F in Figure 3 ) or back (Arrow R in Figure 3 ) the carrier hub (19) along two rails in the structure (21).
  • the squeegee system (16) comprises means for adjusting the angle of attack of the blade (17) with respect to the peripheral surface of the engraved cylinder (11), so as to optimize its scraping. These means for adjusting the angle rotate (Arrows A in Figure 3 ) the central piece (24) of the carrier hub (19), upwardly and downwardly relative to the two side flanges (23), with respect to an axis (X).
  • the squeegee system (16) comprises means for causing the blade (17) to move back and forth (arrows B in Figures 3 and 4 ) on the peripheral surface of the engraved cylinder (11).
  • These means comprise a finger (29) extending laterally from the doctor support (18).
  • the finger (29) is actuated by motorized means (not shown in the Figures) outside the doctor blade system (16).
  • the doctor blade holder (18) is mounted in a slide (not visible) formed in the upper surface of the central piece (24) of the carrier hub (19).
  • the doctor blade support (18) has a lower portion passing through the central piece (24) of the carrier hub (19) and bearing against a return coil spring (31).
  • the back-and-forth movement (B) is in a direction substantially parallel to the axis of revolution (O) of the engraved cylinder (11).
  • the doctor blade support (18) slides laterally in one direction in the slide, being pushed by the finger (29), then slides laterally in another direction in the slide, being pushed by the coil spring (31).
  • the squeegee system (16) comprises means for maintaining a constant contact of the entire length of the edge (22) of the blade (17) with the peripheral surface of the engraved cylinder (11).
  • These means are two pushing elements, in the form of two springs (32). These two springs (32) are arranged laterally and act by moving and pushing (Arrows C) each side cheek (23) of the carrier hub (19). With this displacement of the carrier hub (19), the doctor blade holder (18) and the blade (17) move in the direction of the peripheral surface of the engraved cylinder (11).
  • the two springs (32) placed laterally make it possible to exert a differential thrust on one side and / or on the other side of the carrier hub (19).
  • the edge (22) of the blade (17) thus adapts to the irregularities of the peripheral surface and the mounting defects of the engraved cylinder (11) and remains pressed against the peripheral surface of the engraved cylinder (11).
  • Each of the springs (32) is a flat spring fixed and respectively bearing on each of the two side plates (26) of the structure (21) of the doctor blade system (16).
  • the carrier hub (19) moves linearly with respect to the structure (21) of the doctor system (16).
  • the lateral cheeks (23) of the carrier hub (19) and the two side plates (26) of the structure (21) are arranged to allow movement of the carrier hub (19), the doctor blade support (18) and the blade (17) in the same plane as that formed by the blade (17).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP08734819A 2007-04-27 2008-03-28 Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure Active EP2139683B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08734819A EP2139683B1 (fr) 2007-04-27 2008-03-28 Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07008586 2007-04-27
PCT/EP2008/002441 WO2008141694A1 (fr) 2007-04-27 2008-03-28 Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure
EP08734819A EP2139683B1 (fr) 2007-04-27 2008-03-28 Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure

Publications (2)

Publication Number Publication Date
EP2139683A1 EP2139683A1 (fr) 2010-01-06
EP2139683B1 true EP2139683B1 (fr) 2011-12-28

Family

ID=38627024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08734819A Active EP2139683B1 (fr) 2007-04-27 2008-03-28 Systeme de racle pour groupe imprimeur destine a une machine d'impression en heliogravure

Country Status (7)

Country Link
US (1) US8915184B2 (ja)
EP (1) EP2139683B1 (ja)
JP (1) JP5130577B2 (ja)
CN (1) CN101668635B (ja)
AT (1) ATE538928T1 (ja)
ES (1) ES2375886T3 (ja)
WO (1) WO2008141694A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101779025B1 (ko) * 2013-04-02 2017-09-18 한화테크윈 주식회사 반자동 브레이드 교체용 스퀴지 장치
CN103331990B (zh) * 2013-07-16 2014-12-17 大理美登印务有限公司 一种凹印机改进型刮墨刀锁紧调节装置
WO2017182144A1 (en) * 2016-04-22 2017-10-26 Bobst Italia S.P.A. A doctor blade assembly with support in a rotogravure printing unit
CN106541700A (zh) * 2016-12-12 2017-03-29 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辊刮刀机构
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
CN106739479A (zh) * 2016-12-12 2017-05-31 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单元
FR3084013B1 (fr) 2018-07-18 2020-07-31 Bobst Lyon Racle, chambre a racles et groupe imprimeur ainsi equipe

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DE238265C (ja) *
GB474850A (en) * 1936-08-10 1937-11-09 Friedrich Von Heinrich Improvements in or relating to plate-wiping devices for intaglio printing machines
US2377110A (en) * 1943-09-15 1945-05-29 Rice Barton Corp Printing roll inking device
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DE3039326A1 (de) 1980-10-17 1982-05-06 Windmöller & Hölscher, 4540 Lengerich Rakel mit einem diese hin- und herbewegenden antrieb
US4398463A (en) 1981-08-19 1983-08-16 Motter Printing Press Co. Non-repeat doctor blade drive
FR2539325A1 (fr) 1983-01-17 1984-07-20 Armotek Ind Inc Dispositif d'alimentation en poudre pour appliquer des revetements resistant a l'usure sur des objets
EP0238265B1 (en) * 1986-03-15 1992-06-17 BAKER & FINNEMORE LIMITED Anchoring device
JPH0777795B2 (ja) 1986-04-25 1995-08-23 大日本印刷株式会社 印刷機のドクタ−装置
DD275992A3 (de) 1988-03-07 1990-02-14 Inst Spielzeug Sonneberg Veb Rakelmesserhalter mit selbsttaetigem rakeldruckausgleich
DE3933844A1 (de) * 1989-10-10 1991-04-18 Windmoeller & Hoelscher Rakelvorrichtung
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JP3421485B2 (ja) 1995-09-27 2003-06-30 株式会社小森コーポレーション 凹版印刷機のワイピング装置
JPH1071692A (ja) 1996-08-30 1998-03-17 Dainippon Printing Co Ltd グラビア印刷のテーブルテスト機
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JP4666781B2 (ja) 2001-01-29 2011-04-06 大日本印刷株式会社 ドクター揺動装置
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Also Published As

Publication number Publication date
ATE538928T1 (de) 2012-01-15
US20100116158A1 (en) 2010-05-13
JP5130577B2 (ja) 2013-01-30
WO2008141694A1 (fr) 2008-11-27
US8915184B2 (en) 2014-12-23
CN101668635A (zh) 2010-03-10
CN101668635B (zh) 2012-08-08
ES2375886T3 (es) 2012-03-07
JP2010523380A (ja) 2010-07-15
EP2139683A1 (fr) 2010-01-06

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