EP0709191A1 - Method for cleaning a cylinder of a printing machine - Google Patents
Method for cleaning a cylinder of a printing machine Download PDFInfo
- Publication number
- EP0709191A1 EP0709191A1 EP95114779A EP95114779A EP0709191A1 EP 0709191 A1 EP0709191 A1 EP 0709191A1 EP 95114779 A EP95114779 A EP 95114779A EP 95114779 A EP95114779 A EP 95114779A EP 0709191 A1 EP0709191 A1 EP 0709191A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- washing roller
- cleaning
- washing
- cleaned
- 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
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007639 printing Methods 0.000 title claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007645 offset printing Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F35/00—Cleaning arrangements or devices
- B41F35/06—Cleaning arrangements or devices for offset cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F35/00—Cleaning arrangements or devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2235/00—Cleaning
- B41P2235/10—Cleaning characterised by the methods or devices
- B41P2235/20—Wiping devices
- B41P2235/22—Rollers
Definitions
- the invention relates to a method for cleaning a rotating cylinder in a printing press by means of a washing liquid and at least one washing roller which can be moved against the cylinder and rotates counter to it.
- the invention relates to a method for cleaning the blanket cylinder or the printing cylinder of an offset printing machine.
- the print image is transferred from the plate cylinder to the printing sheet passing between the blanket cylinder and the printing cylinder through a rubber blanket.
- the rubber blanket is stretched over the rubber blanket cylinder, which has an axially continuous pit or a continuous channel in which the tensioning means for the rubber blanket are accommodated. Accordingly, the usable printing area does not extend over the entire circumference of the cylinder. Rather, it is limited by the channel, the rubber blanket being stretched over an edge at the start and end of the print in the direction of the axis of the blanket cylinder.
- the invention has for its object to improve the cleaning method mentioned above for a cylinder of a printing press, so that a complete cleaning of the cylinder can be achieved within reasonable operational interruptions and that deposits on the channel edge at the end of the print are avoided.
- This object is achieved in a very simple manner in that the washing roller is temporarily driven simultaneously to the cylinder to be cleaned during the cleaning process. That is the knowledge based on the fact that the difficulties mentioned only arise from the channel edge at the end of the print, that the opposite channel edge at the start of the print, however, could always be cleaned properly and had no deposits.
- the washing rollers Since the washing rollers always have a surface made of soft, elastic, absorbent material and are pressed against the blanket cylinder with a certain amount of prestress, they "dip" - in relation to the cylinder surface - to a certain extent into the channel, which means that in the conventional method with only opposite directions
- the washing roller also processes the upper part of the channel wall and the edge at the beginning of the print, like the cylinder jacket, for cleaning by the washing rollers.
- On the opposite channel edge i.e. at the end of the print, however, there is a relief effect in the soft-elastic material of the washing roller when washing rollers are operated in opposite directions, so that this channel edge acts as a wiper for the washing roller and residual dirt is deposited there.
- the washing rollers are temporarily driven in parallel with the blanket cylinder, the two channel edges are treated equally and the cause of the deposits is eliminated.
- FIG. 1 A blanket cylinder 1 and a washing roller 2 are shown in section.
- the opposite edge 7 of the channel 6, lies in the "shadow" of the cleaning effect of the washing roller 2 when the drive is in opposite direction and therefore always has deposits in the conventional cleaning methods.
- the washing roller 2 is operated according to the invention temporarily at the same time as the blanket cylinder (arrow 8), the edge 7 of the channel 6, which corresponds to the end of the print, is also cleaned properly.
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Reinigen eines sich drehenden Zylinders in einer Druckmaschine mittels einer Waschflüssigkeit und wenigstens einer gegen den Zylinder bewegbaren und gegenläufig zu diesem rotierenden Waschwalze. Im besonderen betrifft die Erfindung ein Verfahren zur Reinigung des Gummituchzylinders oder des Druckzylinders einer Offset-Druckmaschine.The invention relates to a method for cleaning a rotating cylinder in a printing press by means of a washing liquid and at least one washing roller which can be moved against the cylinder and rotates counter to it. In particular, the invention relates to a method for cleaning the blanket cylinder or the printing cylinder of an offset printing machine.
Beim Offset-Drucken wird das Druckbild durch ein Gummituch vom Plattenzylinder auf den zwischen dem Gummituchzylinder und dem Druckzylinder durchlaufenden Druckbogen übertragen. Das Gummituch ist über den Gummituchzylinder gespannt, der eine in Achsrichtung durchgehende Grube bzw. einen durchgehenden Kanal aufweist, in dem die Spannmittel für das Gummituch untergebracht sind. Dementsprechend erstreckt sich die nutzbare Druckfläche nicht über den gesamten Zylinderumfang. Sie wird vielmehr durch den Kanal begrenzt, wobei das Gummituch über je eine Kante am Druckanfang und am Druckende in Richtung auf die Achse des Gummituchzylinders gespannt ist.In offset printing, the print image is transferred from the plate cylinder to the printing sheet passing between the blanket cylinder and the printing cylinder through a rubber blanket. The rubber blanket is stretched over the rubber blanket cylinder, which has an axially continuous pit or a continuous channel in which the tensioning means for the rubber blanket are accommodated. Accordingly, the usable printing area does not extend over the entire circumference of the cylinder. Rather, it is limited by the channel, the rubber blanket being stretched over an edge at the start and end of the print in the direction of the axis of the blanket cylinder.
Beim Drucken bleiben auf dem Gummituch und gegebenenfalls dem Gegendruckzylinder Farbreste zurück, die bei einem Wechsel der Druckfarben oder der Druckplatte entfernt werden müssen. Außerdem kann sich auf dem Gummituchzylinder Papierstaub anlagern, durch den das Druckbild beeinträchtigt wird. Es ist daher von Zeit zu Zeit erforderlich, bei einer Unterbrechung des Druckvorgangs den Gummituchzylinder oder auch den Druckzylinder zu waschen. Für diesen Zweck ist es bekannt, eine Waschwalze vorzusehen, die bei Bedarf gegen den Gummituchzylinder schwenkbar ist und die mit einer Lösungsmittel enthaltenden Waschflüssigkeit benetzt und zu dem sich drehenden Gummituchzylinder gegenläufig drehend über das Gummituch geführt wird. Auf diese Weise ist in kurzer Zeit eine im wesentlichen befriedigende Reinigung des Gummituchzylinders oder auch des Druckzylinders möglich. Es hat sich jedoch gezeigt, daß das Druckende nicht vollständig gereinigt wird, da die an der Zylindergrube auslaufende Waschwalze Restschmutz an die Grubenkante transportiert und dort ablagert. Mit zunehmender Reinigungsdauer werden diese Ablagerungen von Restschmutz zwar geringer, eine wirklich einwandfreie Reinigung des Druckendes ist aber nur schwer erreichen und es kann auch bei längerer und damit unwirtschaftlicherer Dauer des Reinigungsvorgangs nicht ausgeschlossen werden, daß von Ablagerungen an der am Druckende liegenden Grubenkante Verschmutzungen der Druckbogen ausgehen.During printing, ink residues remain on the rubber blanket and, if applicable, the impression cylinder, which are left over from one Changing the printing colors or the printing plate must be removed. In addition, paper dust can accumulate on the blanket cylinder, which affects the printed image. It is therefore necessary from time to time to wash the blanket cylinder or the printing cylinder if the printing process is interrupted. For this purpose it is known to provide a washing roller which can be swiveled against the blanket cylinder if required and which wets with a washing liquid containing solvent and is guided to the rotating blanket cylinder in opposite directions over the blanket. In this way, a substantially satisfactory cleaning of the blanket cylinder or the printing cylinder is possible in a short time. However, it has been shown that the end of the print is not completely cleaned, since the washing roller which runs out of the cylinder pit transports residual dirt to the edge of the pit and deposits it there. With increasing cleaning time, these deposits of residual dirt become less, but a really flawless cleaning of the print end is difficult to achieve and it cannot be ruled out, even with a longer and therefore uneconomical duration of the cleaning process, that deposits on the pit edge lying at the end of the print contaminate the printed sheets going out.
Der Erfindung liegt die Aufgabe zugrunde, das eingangs genannte Reinigungsverfahren für einen Zylinder einer Druckmaschine zu verbessern, so daß innerhalb vertretbarer Betriebsunterbrechungen eine vollständige Reinigung des Zylinders erreicht werden kann und daß Ablagerungen an der Kanalkante am Druckende vermieden werden.The invention has for its object to improve the cleaning method mentioned above for a cylinder of a printing press, so that a complete cleaning of the cylinder can be achieved within reasonable operational interruptions and that deposits on the channel edge at the end of the print are avoided.
Diese Aufgabe wird erfindungsgemäß in sehr einfacher Weise dadurch gelöst, daß die Waschwalze während des Reinigungsvorgangs zeitweise gleichläufig zu dem zu reinigenden Zylinder angetrieben wird. Dem liegt die Erkenntnis zugrunde, daß die genannten Schwierigkeiten nur von der Kanalkante am Druckende ausgehen, daß die gegenüberliegende Kanalkante am Druckanfang hingegen stets einwandfrei gereinigt werden konnte und keine Ablagerungen aufwies. Da die Waschwalzen stets eine aus weichelastischem, saugfähigen Material bestehende Oberfläche aufweisen und mit einer gewissen Vorspannung gegen die Gummituchzylinder angedrückt werden, "tauchen" sie - bezogen auf die Zylindermantelfläche - um ein gewisses Maß in den Kanal ein, wodurch beim herkömmlichen Verfahren mit ausschließlich gegenläufiger Waschwalze jedenfalls auch der obere Teil der Kanalwand und die Kante am Druckanfang wie der Zylindermantel von den Waschwalzen reinigend bearbeitet werden. Auf der gegenüberliegenden Kanalkante, also am Druckende hingegen, kommt es bei gegenläufig betriebenen Waschwalzen jedoch zu einem Entlastungseffekt im weichelastischen Material der Waschwalze, so daß diese Kanalkante quasi als Abstreifer für die Waschwalze wirkt und sich Restschmutz dort ablagert.This object is achieved in a very simple manner in that the washing roller is temporarily driven simultaneously to the cylinder to be cleaned during the cleaning process. That is the knowledge based on the fact that the difficulties mentioned only arise from the channel edge at the end of the print, that the opposite channel edge at the start of the print, however, could always be cleaned properly and had no deposits. Since the washing rollers always have a surface made of soft, elastic, absorbent material and are pressed against the blanket cylinder with a certain amount of prestress, they "dip" - in relation to the cylinder surface - to a certain extent into the channel, which means that in the conventional method with only opposite directions In any case, the washing roller also processes the upper part of the channel wall and the edge at the beginning of the print, like the cylinder jacket, for cleaning by the washing rollers. On the opposite channel edge, i.e. at the end of the print, however, there is a relief effect in the soft-elastic material of the washing roller when washing rollers are operated in opposite directions, so that this channel edge acts as a wiper for the washing roller and residual dirt is deposited there.
Werden nun die Waschwalzen erfindungsgemäß zeitweise gleichläufig zum Gummituchzylinder angetrieben, so ergibt sich eine Gleichbehandlung der beiden Kanalkanten und die Ursache für die Ablagerungen ist beseitigt. Je nach Art der Verschmutzung kann es genügen, die Waschwalzen nur kurzzeitig gleichläufig zum Zylinder anzutreiben, wenn der Bereich des Druckendes des Zylinders gereinigt wird. Man kann die Waschwalzen aber auch während einer vollen Umdrehung des Zylinders gleichläufig antreiben. Ferner ist es denkbar, die Waschwalzen alternierend gegen- und gleichläufig zum Zylinder anzutreiben, und zwar vorzugsweise für mindestens je eine volle Umdrehung des Zylinders. Schließlich ist es zweckmäßig, die Drehrichtung der Waschwalzen von einer Schalteinrichtung in Abhängigkeit von einem Sensorsignal zu steuern, das beim Durchgang des Zylinders durch eine bestimmte Position ausgelöst wird.If, according to the invention, the washing rollers are temporarily driven in parallel with the blanket cylinder, the two channel edges are treated equally and the cause of the deposits is eliminated. Depending on the type of soiling, it may be sufficient to drive the washing rollers only briefly in synchronism with the cylinder when the area of the print end of the cylinder is cleaned. You can also drive the washing rollers in the same direction during a full revolution of the cylinder. Furthermore, it is conceivable to drive the washing rollers alternately in the opposite and the same direction to the cylinder, preferably for at least one full revolution of the cylinder. Finally, it is expedient to control the direction of rotation of the washing rollers by a switching device as a function of a sensor signal which is triggered when the cylinder passes through a specific position.
Weitere Einzelheiten des erfindungsgemäßen Verfahrens werden anhand der schematischen Darstellung in Figur 1 erläutert. Dargestellt sind ein Gummituchzylinder 1 und eine Waschwalze 2 im Schnitt. Die äußere Kante der Waschwalze 2, die jedenfalls außen aus einem weichelastischen, saugfähigen Material besteht, schneidet bei 3 in die Mantelfläche des Gummituchzylinders 1 ein. Das hat zur Folge, daß bei dem üblichen gegenläufigen Antrieb der Waschwalze 2 (Pfeil 4) die Kante 5 des Kanals 6, die dem Druckanfang entspricht, beim Reinigen wie die Mantelfläche des Gummituchzylinders 1 beaufschlagt und gereinigt wird. Die gegenüberliegende Kante 7 des Kanals 6 hingegen liegt bei gegenläufigem Antrieb im "Schatten" der Reinigungswirkung der Waschwalze 2 und weist daher bei den herkömmlichen Reinigungsmethoden stets Ablagerungen auf. Betreibt man jedoch die Waschwalze 2 erfindungsgemäß zeitweise gleichläufig zum Gummituchzylinder (Pfeil 8), wird auch die Kante 7 des Kanals 6, die dem Druckende entspricht, einwandfrei gereinigt.Further details of the method according to the invention are explained using the schematic illustration in FIG. 1. A
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4438347 | 1994-10-27 | ||
| DE4438347A DE4438347C1 (en) | 1994-10-27 | 1994-10-27 | Cleaning method for cleaning rollers in printing press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0709191A1 true EP0709191A1 (en) | 1996-05-01 |
| EP0709191B1 EP0709191B1 (en) | 1997-06-04 |
Family
ID=6531807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95114779A Expired - Lifetime EP0709191B1 (en) | 1994-10-27 | 1995-09-20 | Method for cleaning a cylinder of a printing machine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5566617A (en) |
| EP (1) | EP0709191B1 (en) |
| JP (1) | JP2889163B2 (en) |
| AT (1) | ATE153915T1 (en) |
| DE (2) | DE4438347C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7998275B2 (en) | 2008-02-26 | 2011-08-16 | Heidelberger Druckmaschinen Ag | Method for cleaning a circumferential surface of a cylinder of a printing press |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5755158A (en) * | 1996-08-28 | 1998-05-26 | Presstek, Inc. | Alternately engageable, dual-stage cleaning system for lithographic printing plates |
| US5870954A (en) * | 1998-01-22 | 1999-02-16 | Presstek, Inc. | Retractable cleaning system for lithographic printing plates |
| DE19942409A1 (en) * | 1999-09-06 | 2001-03-08 | Heidelberger Druckmasch Ag | Burn-up pick-up roll in a platesetter |
| DE10027021B4 (en) * | 2000-05-31 | 2004-04-08 | Koenig & Bauer Ag | Device for cleaning a roller or a cylinder |
| DE10027023B4 (en) * | 2000-05-31 | 2004-07-29 | Koenig & Bauer Ag | Devices for cleaning a roller or a cylinder |
| JP4957958B2 (en) * | 2006-12-21 | 2012-06-20 | 独立行政法人 国立印刷局 | Blanket cylinder dust remover |
| DE102007023626B4 (en) | 2007-05-22 | 2017-04-27 | Koenig & Bauer Ag | Washing device for a rotating cylinder in a printing machine |
| DE102007023625B4 (en) | 2007-05-22 | 2015-10-29 | Koenig & Bauer Ag | Device for cleaning a cylinder in a printing machine |
| DE102008006191B3 (en) * | 2008-01-26 | 2009-07-23 | Manroland Ag | Printing press cylinder e.g. plate cylinder, cleaning method, involves cleaning section of press cylinder or printing plate or transfer form, and washing mill lying before channel opening of clamping channel by cleaning remaining section |
| JP5277992B2 (en) * | 2008-01-30 | 2013-08-28 | 株式会社リコー | Belt drive control device and image forming apparatus |
| JP5169908B2 (en) * | 2009-03-02 | 2013-03-27 | 株式会社リコー | Transfer device and image forming apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR806855A (en) * | 1935-06-07 | 1936-12-28 | Vomag Betr Ag | Washing device for rubber cylinders of rotary offset printing machines |
| FR1351365A (en) * | 1961-05-06 | 1964-02-07 | Roto Service | Automatic cleaning and washing device for offset machines |
| US3897726A (en) * | 1971-11-24 | 1975-08-05 | Heidelberger Druckmasch Ag | Washing device for a blanket cylinder of an offset printing press |
| DE3929282A1 (en) * | 1989-09-04 | 1991-03-28 | Krause Biagosch Gmbh | Washing device for blanket cylinders using cleaning roller - has dissimilarly covered roller segments and axis-parallel sprays for solvent and water both sides of cylinder |
| DE4208079A1 (en) * | 1992-03-13 | 1993-09-16 | Roland Man Druckmasch | Washing rubber sheet cylinder of offset printing machine - comprises washing roller to which washing fluid is applied and on which doctor beam is adjustably arranged. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3120805A (en) * | 1960-11-19 | 1964-02-11 | Roland Offsetmaschf | Cleaning device for the blanket cylinders in offset printing machines |
| DE1561008A1 (en) * | 1966-11-10 | 1970-04-16 | Maschf Augsburg Nuernberg Ag | Washing device for blanket cylinders of rotary printing machines |
| GB1169668A (en) * | 1967-04-20 | 1969-11-05 | Akerlund & Rausing Ab | Improvements in and relating to Means for Washing a Cylinder in a Printing Press |
| DE3614496A1 (en) * | 1986-04-29 | 1987-11-05 | Heidelberger Druckmasch Ag | WASHING DEVICE FOR PRINTING CYLINDERS OF PRINTING MACHINES |
| US5010819A (en) * | 1989-09-22 | 1991-04-30 | Oxy-Dry Corporation | Blanket cleaning apparatus with selectively engageable flicker bar |
| DE4121017A1 (en) * | 1991-06-26 | 1993-01-14 | Koenig & Bauer Ag | WASHING DEVICE FOR INK PRINTING MACHINES |
| JPH07115468B2 (en) * | 1993-04-13 | 1995-12-13 | 日本ボールドウィン株式会社 | Cleaning device for outer peripheral surface of cylinder |
-
1994
- 1994-10-27 DE DE4438347A patent/DE4438347C1/en not_active Expired - Fee Related
-
1995
- 1995-09-20 EP EP95114779A patent/EP0709191B1/en not_active Expired - Lifetime
- 1995-09-20 DE DE59500289T patent/DE59500289D1/en not_active Expired - Lifetime
- 1995-09-20 AT AT95114779T patent/ATE153915T1/en not_active IP Right Cessation
- 1995-10-19 US US08/545,251 patent/US5566617A/en not_active Expired - Fee Related
- 1995-10-25 JP JP7277599A patent/JP2889163B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR806855A (en) * | 1935-06-07 | 1936-12-28 | Vomag Betr Ag | Washing device for rubber cylinders of rotary offset printing machines |
| FR1351365A (en) * | 1961-05-06 | 1964-02-07 | Roto Service | Automatic cleaning and washing device for offset machines |
| US3897726A (en) * | 1971-11-24 | 1975-08-05 | Heidelberger Druckmasch Ag | Washing device for a blanket cylinder of an offset printing press |
| DE3929282A1 (en) * | 1989-09-04 | 1991-03-28 | Krause Biagosch Gmbh | Washing device for blanket cylinders using cleaning roller - has dissimilarly covered roller segments and axis-parallel sprays for solvent and water both sides of cylinder |
| DE4208079A1 (en) * | 1992-03-13 | 1993-09-16 | Roland Man Druckmasch | Washing rubber sheet cylinder of offset printing machine - comprises washing roller to which washing fluid is applied and on which doctor beam is adjustably arranged. |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7998275B2 (en) | 2008-02-26 | 2011-08-16 | Heidelberger Druckmaschinen Ag | Method for cleaning a circumferential surface of a cylinder of a printing press |
Also Published As
| Publication number | Publication date |
|---|---|
| US5566617A (en) | 1996-10-22 |
| EP0709191B1 (en) | 1997-06-04 |
| JP2889163B2 (en) | 1999-05-10 |
| DE59500289D1 (en) | 1997-07-10 |
| ATE153915T1 (en) | 1997-06-15 |
| DE4438347C1 (en) | 1996-02-22 |
| JPH08207260A (en) | 1996-08-13 |
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