EP1477310B1 - Druckmaschine, insbesondere Tiefdruckmaschine mit einer elektrostatischen Druckunterstützung - Google Patents

Druckmaschine, insbesondere Tiefdruckmaschine mit einer elektrostatischen Druckunterstützung Download PDF

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Publication number
EP1477310B1
EP1477310B1 EP04300271A EP04300271A EP1477310B1 EP 1477310 B1 EP1477310 B1 EP 1477310B1 EP 04300271 A EP04300271 A EP 04300271A EP 04300271 A EP04300271 A EP 04300271A EP 1477310 B1 EP1477310 B1 EP 1477310B1
Authority
EP
European Patent Office
Prior art keywords
machine
impression cylinder
contact
disc
ring
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 - Lifetime
Application number
EP04300271A
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English (en)
French (fr)
Other versions
EP1477310A1 (de
Inventor
Francis Badina
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.)
Spengler Electronic AG
Original Assignee
Spengler Electronic AG
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Publication date
Application filed by Spengler Electronic AG filed Critical Spengler Electronic AG
Priority to PL04300271T priority Critical patent/PL1477310T3/pl
Publication of EP1477310A1 publication Critical patent/EP1477310A1/de
Application granted granted Critical
Publication of EP1477310B1 publication Critical patent/EP1477310B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F9/001—Heliostatic printing

Definitions

  • the invention relates to a printing machine, more particularly to gravure printing, comprising an electrostatic assist device for subjecting a pressure roller cooperating with a printing cylinder to an electrostatic charge, said pressure roller being coated externally with a envelope in a semiconductor material and having, at each of its ends, a section of axis contributing to its maintenance in rotation in fixed support bearings.
  • electrostatic assist devices are based on the primary principle that an electric charge of a certain sign is automatically attracted by an electric charge of opposite sign.
  • the ink will tend to refer to it more easily.
  • electrostatic assistance devices consist in placing, parallel to the pressure roll, an induction electrode composed, generally, of a series of electrode tips equidistant from each other. relative to the others and distributed over the entire length of said press roll.
  • Such an induction electrode is then supplied with a high-voltage current, namely of the order of 30 KV, in order to ionize the air separating this electrode and the pressure roll and to establish an effluent stream leading to charge said press roll on the periphery where is precisely a layer of a semiconductor material.
  • this principle consists of charging the pressure roll, not directly, but by ionizing the air separating it from electrodes, by subjecting them to a high voltage supply.
  • the pressure roll comprises a conductive body, which is subjected to a high voltage supply via brushes of appropriate configuration.
  • the pressure roll made of a semiconductor material, more particularly of rubber, receives, at the periphery, a thin layer of a conductive material which is in turn coated with a thin layer of insulating material. It is with this last layer that cooperate contactors connected to a high voltage power supply.
  • an electrostatic assistance device for printing machine more particularly in the form of a ring, engaged on one of the axis sections extending at the ends of the pressure roller and contributing to the maintenance in rotation of the latter in appropriate fixed support bearings.
  • This ring is formed in the manner of a bearing and comprises an inner ring secured to said pressure roll and a fixed outer ring rotatably mounted by appropriate rolling means on said inner ring. It also carries a ring made of an electrically conductive material, in particular copper, on which two contactors integral with the fixed outer ring and connected to a suitable power supply are supported.
  • the ring of electrically conductive material is implanted at an axis section located at one end of the press roll and kept rotated by a fixed support bearing.
  • EP-A-0 439 822 discloses a printing machine having the features of the preamble of claim 1.
  • the pressure roller comprises hydraulic regulation means to guarantee a pressure equally distributed by this pressure roller over the entire length of the impression cylinder, whatever the deformations that the one or the other.
  • the cylinders are designed longer and longer, so that they necessarily describe an arrow that compensate these hydraulic control means.
  • the problem in such a situation is that the supply of this hydraulic fluid press cylinder intervenes through at least one of the axis sections which keep it rotating in its bearings. It is therefore very difficult to apply to this pressure roller an electrostatic charge that is just passed through these axis sections.
  • the invention as defined in the claims is therefore intended to overcome the aforementioned drawbacks, in particular to provide a printing machine with which the risk of arcing is excluded, and on which interventions are not burdened by the uncontrolled nature of the electric current flowing through them.
  • the invention relates to a printing machine, more particularly to gravure printing, comprising an electrostatic assist device for subjecting an electrostatic charge to a pressure roller cooperating with a printing cylinder, said pressure roller being coated externally with an envelope made of a semiconductor material and comprising, at each of its ends, a section of axis contributing to its maintenance in rotation in fixed support bearings, characterized in that said press roll comprises a sheathing of an insulating material above which extends a sleeve of an electrically conductive material encased on its periphery of the semiconductor material casing, said electrostatic assist device consisting of at least one defined contactor adapted to cooperate with the sleeve pressure roller conductor, at least at one end thereof.
  • the machine comprises an insulating member for channeling the electric current so as to allow its transit only between the contactors and the conductive sleeve.
  • Said insulating member is defined by a disc of an insulating material assembled on one of said ends of the pressure roll and having, opposite the conductive body of the press roll, an annular slot or one or a plurality of orifices distributed annularly, for establishing an electrical contact between said conductive body of the pressure roller and the contactors.
  • the disk has a diameter substantially equal to that of the pressure roller.
  • said disc is extended by a collar of insulating material extending above at least one axis section on a portion between the end of the pressure roller and the support bearing.
  • the contactors are extended by a conductive tip capable of being inserted into said annular slot so as to come into contact with said conductive sleeve and ensure the passage of electric current between the contactors. and the latter.
  • said machine comprises a ring of conductive material attached to said disc of insulating material and secured to the pressing roll, said ring cooperating by contact with the contactors and the conductive sleeve of the press roll to allow the passage of electric current .
  • said ring has, on its face placed against the insulating disk, one or a series of annularly distributed pins adapted to be inserted into the conductive sleeve through the distributed orifice or holes. annular manner on said insulating disc.
  • said ring may also have on its face placed against the insulating disc an annular tongue intended to cooperate with the conductive sleeve of the pressure roller through the annular slot.
  • said ring is further extended by a flange against which said contactors are placed in frictional contact.
  • the contactors are housed in a casing in the shape of a ring, integrated on the part of a section of axis extending between a support bearing and the end of the pressing roll.
  • the present invention relates to the field of printing machines, more particularly to gravure printing.
  • such a printing machine is usually provided with an electrostatic assist device 5 for applying to the pressing roll 4 an electrostatic charge for the purpose of passing the substrate 2 under the impression cylinder. 3, to promote the transfer of the ink from the latter on said substrate 2.
  • the pressing roll 4 comprising a body of conductive material 6, is provided with a sheath 7 made of an insulating material above which extends a sleeve 8 made of an electrically conductive material encased on its periphery with an envelope 9 in a semiconductor material, for example a rubber band.
  • the cladding 7 of an insulating material is intended to prevent the diffusion of the electric current internally from the conductive sleeve 8 towards the axis 10 of said press roll 4 and, therefore, towards the axis sections 11, 12, which prolong the latter to each of its ends 13, 14 and contribute to its maintenance in rotation in fixed support bearings 15, 16.
  • the electrostatic assistance device 5 it consists, substantially, by at least one contactor 17,18. This or these are advantageously housed in a casing 19, in the form of a ring, integrated on the portion of a shaft section 11 extending between a support bearing 15 and the end 13 of the pressure roller 4 .
  • the contactor (s) 17, 18 are connected to a power supply, in particular at high voltage (20), and kept in contact with the conductive sleeve (8) of said press roll (4).
  • the present printing machine 1 further comprises an insulating member, which may have various structures, adapted according to the other constituent elements of the invention.
  • This insulating member is intended to channel the electric current applied to the pressing roll 4, so as to allow its transit only between the contactors 17, 18 and the conductive sleeve 8.
  • This insulating member is engaged on the shaft section 9 carried by the support bearing 15 on which the housing 19 is fixed, so as to be situated between said press roll 4 and said contactors 17, 18.
  • said disk 21 has, as the case may be, an annular slot 22 or one or a succession of orifices 23 distributed, preferably, in an annular manner, said slot 22 and said orifices 23 being formed so that once the disc 21 assembled on the end 13 of the pressing roll 4, they are located, at least partially, with respect to the ring corresponding to the conductive sleeve 8 .
  • annular slot 22 and the orifices 23 thus make it possible to establish an electrical contact between the contactors 17, 18 and said conductive sleeve 8, whereas the disc 21 itself, by virtue of its insulating texture, prevents the diffusion of the current electrical to the other components of the machine 1, in particular the section of axis 11.
  • said disk 21 can be further extended above the shaft portion 11 by a collar 24 so as to isolate the latter.
  • the electrical contact between the contactors 17, 18 and the conductive sleeve 8 can be established directly, as shown schematically in FIG. figure 2 , thanks to contactors 17, 18 extended by a conductive tip 25 adapted to be introduced into the annular slot 22 to come into contact with the conductive sleeve 8.
  • the electrical contact can still be established through a ring 26, of conductive material, integral with the disc 21 and on which rub the contactors 17, 18 when the press roll 4 is rotated.
  • This ring 26 may have, according to a first embodiment, one or a series of pins 27 suitably disposed on its face 28 facing the press roll 4, and intended to cooperate with the conductive sleeve 8 through the orifices 23 of the insulating disc 21.
  • the ring 26 may also have, on its face 28, an annular tongue that can be introduced into the annular slot 22 and come into contact with the conductive body 8.
  • said ring 26 is also provided with an annular flange 29 extending in the manner of a sleeve above the flange 24 corresponding to the insulating disc 21. Against this annular flange 29 of conductive material of this ring 26, the contactors 17, 18 are placed in frictional contact.
  • the ring 26 is preferably designed in a material with a low coefficient of friction, for example made of brass, which guarantees a certain longevity of the contactors 17, 18 due to less wear during rotation. of the press cylinder 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Claims (9)

  1. Druckmaschine (1), insbesondere für den Tiefdruck, umfassend eine elektrostatische Hilfsvorrichtung (5), um auf eine Presseurwalze (4), die mit einer Druckwalze (3) zusammenwirkt, eine elektrische Ladung zu übertragen, wobei die Presseurwalze (4) aussen mit einem Überzug (9) aus halbleitendem Material umhüllt ist und an jedem ihrer Enden (13, 14) einen in Stützlagern (15, 16) befestigten Achsenteil (11, 12) umfasst, der zur Aufrechterhaltung ihrer Rotation beiträgt, wobei die Presseurwalze (4) ausserdem einen Mantel (7) aus isolierendem Material umfasst, über dem sich eine Hülle (8) aus elektrisch leitendem Material erstreckt, welche auf ihrer Aussenseite vom Überzug (9) aus halbleitendem Material umhüllt ist, wobei die elektrostatische Hilfsvorrichtung (5) mindestens aus einem Kontakt (17, 18) besteht, welcher ausgebildet ist, mit der leitenden Hülle (8) der Presseurwalze (4) an mindestens einem von deren Enden (13, 14) zusammenzuwirken, dadurch gekennzeichnet, dass sie ein Isolationsorgan umfasst, welches zur Kanalisierung des elektrischen Stroms bestimmt ist, derart, dass es die Durchleitung nur zwischen dem Kontakt oder den Kontakten (17, 18) und der leitenden Hülle (8) zulässt, wobei das Isolationsorgan durch eine Scheibe (21) aus isolierendem Material gebildet ist, die an einem der Enden (13) der Presseurwalze (4) angebracht ist und gegenüber der leitenden Hülle (8) einen Ringspalt (22) oder mindestens eine Öffnung (23) aufweist, welche es erlauben, eine elektrische Verbindung zwischen der leitenden Hülle (8) und dem Kontakt oder den Kontakten (17, 18) herzustellen.
  2. Maschine (1) gemäss Anspruch 1, dadurch gekennzeichnet, dass die Scheibe (21) einen Durchmesser hat, der im Wesentlichen gleich dem der Presseurwalze (4) ist.
  3. Maschine (1) gemäss einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Scheibe (21) durch einen Kragen (24) aus isolierendem Material verlängert ist, die sich mindestens in einem Abschnitt zwischen dem Ende (13) der Presseurwalze (4) und dem Stützlager (15) über ein Achsenteil (11) erstreckt.
  4. Maschine (1) gemäss einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Kontakt oder die Kontakte (17, 18) mit einem leitenden Ansatzstück (25) verlängert sind, das derart in den Ringspalt (22) eingreifen kann, dass es mit der leitenden Hülle (8) in Kontakt kommt und den Fluss des elektrischen Stroms zwischen letzterer und den Kontakten (17, 18) sicherstellt.
  5. Maschine (1) gemäss einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, dass sie einen Ring (26) aus leitendem Material umfasst, der an der Scheibe (21) aus isolierendem Material anliegt und gemeinsam mit der Presseurwalze (4) rotiert, wobei der Ring (26) durch elektrischen Kontakt mitwirkt, den Stromfluss zwischen den Kontakten (17, 18) und der leitenden Hülle (8) zu ermöglichen.
  6. Maschine (1) gemäss Anspruch 5, dadurch gekennzeichnet, dass der Ring (26) auf seiner gegen die isolierende Scheibe (21) platzierten Seite (28) ein oder mehrere ringförmig angeordnete Noppen (27) aufweist, die zur Kontaktierung der leitenden Hülle (8) in die eine oder mehreren Öffnungen (23) eingreifen können.
  7. Maschine (1) gemäss Anspruch 5, dadurch gekennzeichnet, dass der Ring (26) auf seiner gegen die isolierende Scheibe (21) platzierten Seite (28) eine ringförmige Lasche umfasst, die dazu bestimmt ist, durch den Ringspalt (21) hindurch mit der leitenden Hülle (8) der Presseurwalze (4) zusammenzuwirken.
  8. Maschine (1) gemäss einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass der Ring (26) durch einen Kragen (29) verlängert ist, welcher am Kragen (24) aus isolierendem Material der Scheibe (21) ansetzt und sich über einen Achsenteil (11) erstreckt, wobei der Kontakt oder die Kontakte (17, 18) mittels Reibung gegen diesen Kragen (29) kontaktiert sind.
  9. Maschine (1) gemäss einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Kontakte (17, 18) in einem Gehäuse (19) in Form einer Krone angeordnet sind, integriert in einem Abschnitt des Achsenteils (11), der sich zwischen einem Stützlager (15) und dem Ende (13) der Presseurwalze (4) erstreckt.
EP04300271A 2003-05-12 2004-05-12 Druckmaschine, insbesondere Tiefdruckmaschine mit einer elektrostatischen Druckunterstützung Expired - Lifetime EP1477310B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04300271T PL1477310T3 (pl) 2003-05-12 2004-05-12 Maszyna drukarska, w szczególności do heliograwiury, zawierająca wspomagające urządzenie elektrostatyczne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0305680 2003-05-12
FR0305680A FR2854835B1 (fr) 2003-05-12 2003-05-12 Machine d'impression, plus particulierement a heliogravure, comportant un dispositif d'assistance electrostatique

Publications (2)

Publication Number Publication Date
EP1477310A1 EP1477310A1 (de) 2004-11-17
EP1477310B1 true EP1477310B1 (de) 2011-09-28

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EP04300271A Expired - Lifetime EP1477310B1 (de) 2003-05-12 2004-05-12 Druckmaschine, insbesondere Tiefdruckmaschine mit einer elektrostatischen Druckunterstützung

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Country Link
EP (1) EP1477310B1 (de)
AT (1) ATE526158T1 (de)
FR (1) FR2854835B1 (de)
PL (1) PL1477310T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006016178U1 (de) * 2006-10-19 2008-03-06 Dettke, Christa Rotationsdruckmaschine
PL2209630T3 (pl) * 2007-11-07 2016-09-30 Walec dociskowy

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4697514A (en) 1965-10-07 1987-10-06 Gravure Association Of America Method and apparatus for transferring ink in gravure printing
CH680424A5 (de) * 1990-02-01 1992-08-31 Escher Wyss Ag
FR2677301B1 (fr) * 1991-06-05 1993-12-24 Mira Sarl Dispositif d'assistance electrostatique pour machine d'impression notamment a heliogravure.

Also Published As

Publication number Publication date
FR2854835B1 (fr) 2006-03-10
FR2854835A1 (fr) 2004-11-19
EP1477310A1 (de) 2004-11-17
ATE526158T1 (de) 2011-10-15
PL1477310T3 (pl) 2012-02-29

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