EP0778128A1 - Entraînement pour plusieurs cylindres de transfert d'une machine à imprimer - Google Patents

Entraînement pour plusieurs cylindres de transfert d'une machine à imprimer Download PDF

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Publication number
EP0778128A1
EP0778128A1 EP96119437A EP96119437A EP0778128A1 EP 0778128 A1 EP0778128 A1 EP 0778128A1 EP 96119437 A EP96119437 A EP 96119437A EP 96119437 A EP96119437 A EP 96119437A EP 0778128 A1 EP0778128 A1 EP 0778128A1
Authority
EP
European Patent Office
Prior art keywords
transfer
cylinders
transfer cylinders
bearer rings
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.)
Granted
Application number
EP96119437A
Other languages
German (de)
English (en)
Other versions
EP0778128B1 (fr
Inventor
Anton Rodi
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.)
RODI, ANTON
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0778128A1 publication Critical patent/EP0778128A1/fr
Application granted granted Critical
Publication of EP0778128B1 publication Critical patent/EP0778128B1/fr
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
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/008—Mechanical features of drives, e.g. gears, clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/20—Supports for bearings or supports for forme, offset, or impression cylinders
    • B41F13/21—Bearer rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/70—Forming the printing surface directly on the form cylinder

Definitions

  • the invention relates to a device for driving a plurality of transfer cylinders of a digital printing press.
  • the transfer cylinders such as plate and blanket cylinders
  • the transfer cylinders are connected to one another via gearwheels in order to be driven synchronously together.
  • the absolute forced synchronization of the transfer cylinders by gears is necessary so that their relative phase position remains exactly the same even after any number of revolutions.
  • bearer rings have been provided on both sides of the plate and rubber cylinder, hardened and ground rings made of steel, the outer diameter of which is generally equal to the diameter of the pitch circle of the gear wheel of the corresponding cylinder.
  • the bearer rings roll together with the cylinders under pre-tension, which makes the machine run smoothly, protects the drive and extends the service life of the pressure plate.
  • the invention has for its object to provide a particularly simple drive for the transfer cylinder of a digital printing press.
  • a digital printing machine works, for example, in such a way that a print image is applied to a first transfer cylinder which has a hard surface for printing reasons has, is transferred from this to a second transfer cylinder having a jacket made of an elastic material, and is transferred from the second transfer cylinder to a substrate, wherein the elastic material for a uniform color transfer to a substrate such.
  • B. can nestle paper.
  • the first transfer cylinder corresponds to the plate cylinder of an offset printing press and the second transfer cylinder corresponds to the blanket cylinder of an offset printing press.
  • any transmission elements between the transfer cylinders of the digital printing machine are now dispensed with and the transfer cylinders are only coupled to one another via bearer rings, which are normally arranged at the ends of the transfer cylinders.
  • One of the transfer cylinders is driven by a motor of the printing press and takes the other transfer cylinder with it by means of the bearer rings.
  • the driven transfer cylinder is preferably the one that transfers the ink to the substrate because of the multiple torque requirements on this transfer cylinder.
  • the invention takes advantage of the fact that an absolute synchronization between the transfer cylinders can be dispensed with in a digital printing press.
  • a relative synchronization is sufficient, such that the phase shift along the transfer path of the printing ink is at least not greater than the desired print resolution due to the inevitable slippage of the bearer rings. Since a printing plate with the structure of the printed image is not required in a digital printing machine, but a complete printed image is produced in each machine cycle, it has no influence on the printing result if the slight phase shifts add up over time. This also applies in the event that the transfer cylinders are driven not only one printing unit, but several printing units in the manner according to the invention.
  • a prerequisite for such a relative synchronization is, however, that the pretension between the bearer rings of two transfer cylinders rolling against each other is large enough that the entrainment effect is caused by the bearer ring friction and not by friction between the transfer cylinders.
  • the bearer rings can namely be made with a precisely defined diameter, while the processing conditions on the transfer cylinders are generally complicated, especially when one of the transfer cylinders is a cylinder with a jacket made of an elastic material, e.g. B. rubber.
  • a rubber blanket builds up in operation in front of a transfer point where it is e.g. B. is pressed against another transfer cylinder. This increases the effective size of the rubber blanket and its peripheral speed by approximately 2 to 3 percent.
  • transfer cylinders one of which is a rubber cylinder
  • it can, however, be ensured by a suitable choice of the diameter ratio of the bearer rings that the peripheral speeds of the transfer cylinders are approximately the same, so that as little as possible at the transfer point Slip occurs.
  • the coefficient of static friction of rubber on steel is approximately five times that of steel on steel.
  • one of the transfer cylinders is a rubber cylinder, it must therefore be ensured in a drive according to the invention that the contact pressure between the bearer rings is at least about five times as large as that
  • the force with which the transfer cylinders are pressed against each other is usually much greater in order to create safety reserves for changing operating conditions.
  • the bearings of the transfer cylinders must be set up to absorb these forces.
  • the invention is not only suitable for systems with two transfer cylinders, as described above, but also for a common drive of three or more transfer cylinders.
  • three series-connected transfer cylinders of a printing unit can drive the middle one, while the other two are carried away by bearer rings.
  • the transfer cylinders of a plurality of printing units arranged one behind the other can also be coupled to one another by bearer rings, only one of the transfer cylinders being driven. Even if several bearer ring couplings are connected in series, the slip at the bearer rings can be made small enough that the accuracy of the synchronization is within the tolerable range.
  • the digital printing unit shown in FIGS. 1 and 2 contains a first transfer cylinder 1 and a second transfer cylinder 2, which are arranged parallel to one another and touch one another on the circumference.
  • the transfer cylinders 1, 2 are rotatably mounted on side walls of a printing press, not shown.
  • a write head 3 and an inking unit 4 are arranged on the circumference of the first transfer cylinder 1 and each extend over the entire printing width.
  • the second transfer cylinder 2 has a drive shaft 5 which is connected to a motor 6.
  • the motor 6 is shown in the figures as lying on the axis of the second transfer cylinder 2, but can of course also be arranged at any other point in the printing press and via power transmission elements, for. B. a gear, be connected to the drive shaft 5.
  • the second transfer cylinder 2 also has a jacket (not shown separately) made of an elastic material such as rubber. Adjacent to the second transfer cylinder 2 is a conveyor belt 7, only partially drawn, on which substrates 8 to be printed lie.
  • two axial bearer rings 9, 10 made of case-hardened steel are flanged to the side of each transfer cylinder 1, 2, each having essentially the same diameter as the corresponding transfer cylinder 1, 2.
  • the exact diameters of the transfer cylinders 1, 2 and the bearer rings 9, 10 are chosen in accordance with the respective material properties so that a defined contact pressure is maintained between the bearer rings 9 and 10, while the transfer cylinders 1, 2 are pressed against each other with a much lower force as will be explained in more detail later.
  • the transfer cylinders 1, 2 are shown in FIGS. 1 and 2 with the same diameters, but can also have different diameters.
  • the transfer cylinder 1 and the bearer rings 9 can have larger diameters than the transfer cylinder 2 and the bearer rings 10.
  • the exact diameter ratio of the bearer rings 9, 10 is adapted to the special processing conditions on the transfer cylinders 1, 2, as will be described.
  • the conveyor belt 7 conveys the substrates 8 in a straight line in the direction of the arrow, the substrates 8 being pressed against the second transfer cylinder 2 along a straight contact point.
  • the motor 6 rotates the second transfer cylinder 2 so that its peripheral speed is equal to the conveying speed of the conveyor belt 7.
  • the second transfer cylinder 2 takes the first transfer cylinder 1 along with the bearer rings 9, 10, so that the transfer cylinders 1, 2 roll against each other in the directions of the arrows shown.
  • the write head 3 describes the first transfer cylinder 1 rotating past it with a latent one Image that is developed on the inking unit 4.
  • the developed print image is transferred to the second transfer cylinder 2, from which it is then transferred to a substrate 8. If necessary, 1 or 2 cleaning devices for leftover, non-transferred ink can be provided on the transfer cylinders.
  • the bearer rings 9, 10 bring about a very precise synchronization of the rotation of the transfer cylinders 1, 2.
  • a slip of the first transfer cylinder 1 with respect to the second transfer cylinder 2 of only a few micrometers or less can be achieved which is easily tolerable.
  • the static friction resistance between the bearer rings 9, 10 is greater than that between the transfer cylinders 1, 2.
  • the bearer rings 9, 10 then roll - except for a very small slip - almost ideally on top of each other. This does not change the fact that an inevitable relative movement occurs between the surfaces of the transfer cylinders 1, 2.
  • the sliding friction resistance with such a relative movement is always smaller than the static friction resistance.
  • such relative movements are kept as small as possible from the outset by selecting the diameter ratio of the bearer rings 9, 10 to be equal to the circumferential ratio of the transfer cylinders 1, 2, taking into account the elongation of the rubber jacket of the second transfer cylinder 2 during operation. This elongation results from a deformation of the rubber jacket of the second transfer cylinder 2 in the area of the transfer point from the first transfer cylinder 1.
  • ⁇ Z is approximately five times as large as ⁇ S. Therefore, the contact pressure F S between the bearer rings must be at least five times the contact pressure F Z between the transfer cylinders so that the friction between the bearer rings predominates and - apart from the slight slip - there is no relative movement between them.
  • the frictional resistance can, however, be subject to temporal fluctuations in operation, e.g. B. because of uneven material properties or due to the material jam mentioned in front of the transfer point. For this reason, in practice a much higher one To choose contact force F S between the bearer rings than would be calculated, for example ten or twenty times the force F Z with which the transfer cylinders are pressed against each other.
  • the torque requirements at the transfer point on the substrate 8 would also have to be taken into account in an estimation of the contact forces.
  • the transfer cylinders can be connected in series in terms of drive, or several other transfer cylinders can be driven by the bearer rings of a transfer cylinder, possibly with the addition of further bearer rings, in order to bridge distances between the transfer cylinders. Such a case is shown in FIG. 3.
  • the printing machine shown in Fig. 3 contains three transfer cylinders 11, 12, 13, which are arranged one behind the other on a conveyor belt 14 which conveys substrates 15 in the direction of the arrow.
  • a motor 16 is connected to the central transfer cylinder 12, possibly via a gear (not shown), and turns it into Arrow direction.
  • the transfer cylinders 11, 12 and 13 have side bearer rings which are pressed against one another in a row with the interposition of two further bearer rings 17.
  • each of the printing units may not only have one transfer cylinder 11, 12 or 13, as shown in FIG. 3, but may also be a system with two transfer cylinders, as shown in FIGS. 1 and 2, or even more transfer cylinders. Even with such a chain of transfer cylinders, which are connected to one another via bearer rings, the total slip between the bearer rings remains tolerable, since it is still of the order of micrometers and therefore has no noticeable effect on the raster accuracy of the printed images.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Ink Jet (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP96119437A 1995-12-04 1996-12-04 Entraínement pour plusieurs cylindres de transfert d'une machine à imprimer Expired - Lifetime EP0778128B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545114 1995-12-04
DE19545114A DE19545114A1 (de) 1995-12-04 1995-12-04 Antrieb für mehrere Übertragungszylinder einer Druckmaschine

Publications (2)

Publication Number Publication Date
EP0778128A1 true EP0778128A1 (fr) 1997-06-11
EP0778128B1 EP0778128B1 (fr) 2000-04-26

Family

ID=7779101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119437A Expired - Lifetime EP0778128B1 (fr) 1995-12-04 1996-12-04 Entraínement pour plusieurs cylindres de transfert d'une machine à imprimer

Country Status (5)

Country Link
US (1) US5809883A (fr)
EP (1) EP0778128B1 (fr)
JP (1) JPH09174803A (fr)
AU (1) AU721243B2 (fr)
DE (2) DE19545114A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043963A1 (fr) * 2000-11-29 2002-06-06 Koenig & Bauer Aktiengesellschaft Cylindre d'une presse rotative comportant une bague de cylindre

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100423161B1 (ko) * 1996-03-15 2004-06-30 니폰샤신인사츠가부시키가이샤 박막형성장치
DE19927555A1 (de) * 1999-06-16 2000-12-21 Koenig & Bauer Ag Einrichtung zum Einstellen von Schmitzringen
EP1440800A2 (fr) 1999-01-18 2004-07-28 Koenig & Bauer Aktiengesellschaft Entraínement de cylindres d'une machine rotative d'impression
DE19911180C2 (de) * 1999-03-12 2001-02-01 Koenig & Bauer Ag Druckwerk für eine Rotationsdruckmaschine
DE10327490B4 (de) * 2003-06-17 2006-09-21 Koenig & Bauer Ag Druckeinheit einer Rotationsdruckmaschine
ES1065654Y (es) * 2006-07-27 2008-01-16 Rotatek S A Cilindro con aros de rodadura para maquinas de impresion offset
DE102009001338A1 (de) * 2009-03-05 2010-09-09 Manroland Ag Druckwerk für eine Offsetdruckmaschine, sowie Verfahren zur Veränderung einer Druckwerkseinstellung
DE102013110459A1 (de) * 2012-10-23 2014-04-24 manroland sheetfed GmbH Druckmaschine und Verfahren zum Betreiben einer Druckmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR419203A (fr) * 1910-05-20 1910-12-29 Societe De La Manufacture D Indiennes Emile Zundel Procédé permettant de produire par impression, sur tissus, des effets changeants et des effets imitant le tissé en plusieurs nuances

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
DE54800C (de) * W. SCHULTHEISS in Ehingen a. D., Württemberg Bienenschöpfapparat für Dzierzonstöcke
DE7112211U (de) * 1971-07-08 Solberg A Antrieb von Druckwalzen durch bieg same Wellen
DE207359C (fr) *
DE215903C (fr) *
US1171490A (en) * 1913-07-02 1916-02-15 Wood Newspaper Mach Corp Bearing device for printing-couples.
US1338347A (en) * 1915-06-25 1920-04-27 Wood Newspaper Mach Corp Adjustable bearer for printing-couples
US2362069A (en) * 1942-06-01 1944-11-07 Hoe & Co R Printing cylinder bearer
US3138097A (en) * 1962-03-14 1964-06-23 Harris Intertype Corp Printing press and method
US3196788A (en) * 1962-03-19 1965-07-27 Michle Goss Dexter Inc Bearer ring desing for four cooperating cylinders
US3331873A (en) * 1965-04-23 1967-07-18 Allied Chem Removal of chlorine from liquid phosgene with activated carbon
DE2802153C2 (de) * 1978-01-19 1986-08-07 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Schmitzringanordnung
DD207359A1 (de) * 1982-04-21 1984-02-29 Polygraph Leipzig Druckwerkszylinderantrieb, insbesondere fuer rollenrotations-offsetdruckmaschinen
DE4401300A1 (de) * 1993-02-09 1994-08-11 Grapha Holding Ag Vorrichtung zur Verarbeitung von band- resp. blattförmigem Material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR419203A (fr) * 1910-05-20 1910-12-29 Societe De La Manufacture D Indiennes Emile Zundel Procédé permettant de produire par impression, sur tissus, des effets changeants et des effets imitant le tissé en plusieurs nuances

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Heidelberg DI-Technologie revolutioniert die Drucktechnik", DEUTSCHER DRUCKER, vol. 27, no. 39, 17 October 1991 (1991-10-17), OSTFILDERN, pages w5 - w8, XP000231323 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043963A1 (fr) * 2000-11-29 2002-06-06 Koenig & Bauer Aktiengesellschaft Cylindre d'une presse rotative comportant une bague de cylindre

Also Published As

Publication number Publication date
DE19545114A1 (de) 1997-06-05
JPH09174803A (ja) 1997-07-08
US5809883A (en) 1998-09-22
EP0778128B1 (fr) 2000-04-26
AU7412596A (en) 1997-06-12
DE59605036D1 (de) 2000-05-31
AU721243B2 (en) 2000-06-29

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