US3744414A - Dampening device for lithographic presses - Google Patents
Dampening device for lithographic presses Download PDFInfo
- Publication number
- US3744414A US3744414A US00190491A US3744414DA US3744414A US 3744414 A US3744414 A US 3744414A US 00190491 A US00190491 A US 00190491A US 3744414D A US3744414D A US 3744414DA US 3744414 A US3744414 A US 3744414A
- Authority
- US
- United States
- Prior art keywords
- roller
- metering roller
- metering
- fluid
- printing
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/26—Damping devices using transfer rollers
Definitions
- ABSTRACT A dampening system for a printing press which includes a resilient metering roller which is concave in plan profile, havinga diameter at its ends which is larger than the diameter over the central portion so as to develop relatively higher contact pressure at its ends for blocking off flow of dampening fluid in the end regions when printing a sheet of small size.
- Means are provided for skewing the metering roller to selectively reduce the pressure at the ends for securing a more nearly uniform axial distribution for the printing of sheets of full roller width.
- the skewing may be augmented to compensate for any bowing which may occur in the rollers.
- the skewing is effected by mounting the metering roller on individually swingable arms with means for differential adjustment of the arms. Eccentrics at the ends of the metering roller enable adjustment of the pressure.
- Dampening devices are normally constructed so as to produce even distribution of water or other dampening fluid over the entire width of the applicator roller and plate cylinder. Where sheets of narrower than standard size are to be printed the water fed from the ends of the applicator roller is not consumed and tends to accumulate to produce a flooding condition. Steps have been taken in the past to reduce the flow of dampening fluid at the ends or in other localized regions of the applicator roller but this has required troublesome conversion when the press is again set up for the printing of full size sheets. Steps have also been taken to compensate for axial variations .in feed due to slight bowing of rollers running in pressure engagement.
- FIG. 1 is an elevational view of a dampening system incorporating the present invention.
- FIG. 2 is a-fragmentary plan view of the system set forth in FIG. 1.
- FIG. 3 is an elevational view'of the system shown in FIG. 1 but with the metering roller skewed for feeding of an axially uniform film of fluid.
- FIG. 4 is a plan view corresponding to FIG. 3.
- FIGS. 5 and 6 are fragmentary elevations showing means for calibrating the skew and pressure adjustments.
- a lithographic printing press including a dampening system generally indicated at 10 which cooperates with a plate cylinder 11.
- a dampening system generally indicated at 10 which cooperates with a plate cylinder 11.
- an ink applicator or form roller 12 is used, fed, for example, through a series of rollers (not shown), from a suitable source of ink 13.
- a water fountain 20 For the purpose of transmitting a film of dampening fluid to the plate, a water fountain 20 is provided having a body 21 of water or other dampening fluid and having a fountain roller 22.
- the fountain roller 1 22 which is preferably hardsurfaced is rotated in the fountain, preferably at a speed lower than press surface speed, by a drive mechanism 23.
- the fountain roller 22 is rotated in the direction of the arrow to provide an ascending or feed side 24, to which the fluid clings, and a descending or return side 25.
- Each roller in a series has such feed side and return side.
- a resiliently surfaced applicator roller 26 which issometimes referred to as a water form roller.
- a transfer roller-(not shown) may be interposed between the fountain roller and the applicator roller.
- a metering roller running in pressing engagement with the feed side of the fountain roller or other rollers in the fluid system, the metering roller having a concave plan profile with a larger diameter at the ends than over the central portion so as to relatively augment the pressure applied at the ends thereby to block passage of fluid at the ends for printing of sheets of less than full roller width, the metering roller having means for adjustably skewing it with respect to the fountain roller so as to reduce the pressure applied at the ends of the metering roller for achieving substantially uniform axial distribution of fluid for printing of sheets of full roller width and to compensate for any bowing tendency.
- metering roller is journaled in a pair of arms which are independently swingable about the axis of the engaged roller and having independent adjusting means coupled to the press frame for adjusting the degree of skew.
- a resilient metering roller 30 is provided having a central portion 31 and end portions 32. Projecting from the metering roller are stub shafts 33, 33a which are journaled in bearings 34, 34a. The bearings are mounted in levers 35, 350 which are mounted for independent swinging movement coaxially with respect to the fountain roller 22.
- the metering roller.30 is parallel to the axis of the fountain roller 22 which it engages.
- eccentrics 36, 36a having adjusting arms 37, 37a are interposed between the levers and the bearings of the metering roller.
- the metering roller is so formed as to be concave in plan profile, having a diameter d] over its central portion and a diameter d2 at the ends.
- the high pressure at the ends of the metering roller effectively blocks passage of a film of dampening fluid in the end positions so that a film of fluid is transmitted (as indicated by the stipp ling) only over the central portionof the fountain roller, via the central portion of the applicator roller, to the central portion of the plate cylinder for printing of sheets having a width N less than the width of the rollers. This prevents the flooding at the endsof the dampening rollers which is usually encountered in presses where the film is fed more or less uniformly over the entire axial width of the rollers in the dampener system.
- means are provided for differentially adjusting the swingable levers 35, 35a so that the metering roller is skewed relative to the axis of the fountain roller which it engages, such skewing serving to move the ends of the metering roller relatively away from the axis of the fountain roller thereby to reduce the pressure exerted by the ends of the metering roller and permitting a more uniform flow of dampening fluid over the entire length of the metering roller for printing of sheets of full roller width.
- a linkage including a threaded element is interposed between each of the levers 35, a and the press frame. Taking the lever 35 by way of example, a link is pinned to the lever at one end 41.
- the metering roller 30 is skewed into the position shown thus reducing the pressure applied by the ends of the metering roller upon the fountain roller.
- the degree of skew may be so adjusted that the pressure applied by the metering roller is uniform along the entire length of the metering roller so that a film of dampening fluid of constant thickness, indicated by the stippling, is fed to a wide printing area indicated at W for printing of sheets of wide, i.e., standard, width.
- the skew control knobs 45, 450 may be calibrated as shown in FIG. 5, the calibration being such as to account for turning of the knob through a number of revolutions.
- the knob 45 is provided with a pinion which engages a gear 51 having a pointer 52 which cooperates with a scale 53.
- both of the pointers may be set to the zero reference position.
- one or both of the control knobs may be rotated to predetermined scale positions.
- the eccentrics 36, 36a may be calibrated, as shown in FIG. 6.
- a scale 55 may be secured to the lever 35 and cooperating directly with the eccentric adjusting arm 37.
- roller means is intended to be sufficiently broad as to include any roller within a dampening system which consists of a number of rollers interposed in the path of fluid transfer.
- This center feeding tendency may be readily overcome in the present construction by skewing the metering roller to an angle beyond that which would apply if the rollers were perfectly stiff and unbowing.
- axial uniformity of fluid or standard width even where relatively thin and flexible rollers are used, simply by turning the skew knob, or knobs, an augmented amount to provide even less per unit pressure, relatively speaking, at the ends of the metering roller and with the desired total pressure being restored, if desired, by touch-up adjustment at the eccentrics.
- the skew setting and eccentric adjustment corresponding to the condition of uniform feeding of fluid for the printing of a sheet of full width may be noted and the settings reestablished at any future time upon the calibration scales without any special tailoring adjustment and by a press operator who is relatively unskilled but capable of resetting the adjustment on the scales as a purely routine or mechanical procedure.
- the me tering roller is made of resilient material, for example, synthetic rubber running in engagement with a hard surfaced roller, for example, the fountain roller in the fluid feed system.
- the metering roller may be of hard surfaced construction cooperating with the feeding side of a resilient roller in the fluid feed system.
- a hard surfaced metering roller could, for example, engage the undersurface of the form roller 26. If this were done, the arms 35,35a and the associated adjusting means could be retained, with the arms swiveling about the stubshafts of the form roller rather than about the stubshafts of the fountain roller.
- the invention is particularly applicable to the supplying of dampening fluid, it will be apparent that the invention in its broader aspect is not limited to use with dampening fluid but is applicable wherever there is need for adjusting the axial distribution of a film of fluid fed between a set of cooperating rollers.
- the invention may be employed in the feeding of ink in an ink supply system entirely analogously to the feeding of water or the like in a dampening system and where it is desired to ink only the central section of a printing cylinder for the printing of sheets of narrow width or for the purpose of compensating for the bowing of the ink-feeding cylinders.
- dampening fluid as used herein is not to be limited to water or the like but may be construed to cover any fluid which is to be fed in the form of a film to a printing plate or other cylindrical receiving surface.
- a dampening system for lithograph press having a frame journaling a plate cylinder
- the combination comprising a source of dampening fluid, roller means including a plurality of serially arranged rollers coupled to the source for forming and transferring a film ofdampening fluid to the plate cylinder, a metering roller running in pressing engagement with the feeding side of one of the serially arranged rollers for determining the thickness of the film, at least the metering roller or the roller which it engages being resiliently surfaced, the metering roller being concave in plan profile having a larger diameter at its ends than over its central portion so as to relatively augment the pressure applied by the metering roller at its ends thereby to block transfer of dampening fluid at the ends of the roller means when the metering roller and roller means are substantially parallel for printing of sheets of narrow width, means for mounting the metering roller for adjustable skewing movement thereby to enable adjustment of the metering roller to a skewed position relative to the roller means in which the ends of the metering
- a dampening system for lithograph press having a frame journaling a plate cylinder
- the combination comprising a fountain roller rotatably driven in a fountain having a supply of dampening fluid, an applicator roller interposed between the fountain roller and the plate cylinder for conveying a film of dampening fluid to the plate cylinder, a resilient metering roller running in pressing engagement with the feeding site of the fountain roller for determining the thickness of the film on the fountain roller which is available for transfer to the applicator roller, the metering roller having a concave plan profile with a larger diameter at the ends than over the central portion so as to relatively augment the pressure applied by the metering roller at its ends thereby to block passage of fluid at the ends when the metering roller is substantially parallel to the fountain roller while providing a substantially even axial distribution of fluid over the central portion of the applica tor roller for the printing of sheets of less than the full roller width, and means for adjustably skewing the metering roller with respect to the fountain, roller to reduce the pressure applied
- a dampening system for lithograph press having a frame journaling a plate cylinder
- the combination comprising a source of dampening fluid, roller means comprising a plurality of serially arranged rollers coupled to the source for forming a film of dampening fluid and including an application roller for applying the fluid to the plate cylinder, a metering roller running in engagement with the feeding side of one of the serially arranged rollers for determining the thickness of the film, at least the metering roller or the roller which it engages being resiliently surfaced, the metering roller fluid at the ends of the roller means when the metering roller and roller means are substantially parallel for printing of sheets of narrow width, the metering roller being journaled in a pair of independently swingable.
- levers coaxial with the engaged roller and having means for differentially adjusting the angular positions of the levers thereby to enable swinging of the metering roller to a skewed position relative to the engaged roller for more uniform axial distribution of the pressure exerted by the metering roller to-equalize flow of dampening fluid along the axis of the applicator roller when printing sheets of substantially full roller width.
- the levers each having journals for engaging the ends of the metering roller and eccentrics interposed between the levers and the respective journals for varying the pressure applied by the metering roller against the engaged roller.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2054678A DE2054678C3 (de) | 1970-11-06 | 1970-11-06 | Feuchtwerk für lithographische Druckmaschinen |
Publications (1)
Publication Number | Publication Date |
---|---|
US3744414A true US3744414A (en) | 1973-07-10 |
Family
ID=5787371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00190491A Expired - Lifetime US3744414A (en) | 1970-11-06 | 1971-10-19 | Dampening device for lithographic presses |
Country Status (2)
Country | Link |
---|---|
US (1) | US3744414A (de) |
DE (1) | DE2054678C3 (de) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3934506A (en) * | 1974-04-02 | 1976-01-27 | Adolph Gottscho, Inc. | Apparatus for imprinting intermittently advanced webs |
US4385559A (en) * | 1978-12-28 | 1983-05-31 | Roberto Jarach | Dampening device for offset printing machines for alternate and selective utilization of water or of a water-alcohol mixture |
WO1986002319A1 (en) * | 1984-10-11 | 1986-04-24 | Marcum Charles L | Dampening unit for printing press |
US4669379A (en) * | 1984-05-17 | 1987-06-02 | Steffens Robert S | Ink transfer arrangement and method in a printing press |
US4841855A (en) * | 1984-10-11 | 1989-06-27 | Marcum Charles L | Dampening unit for printing press |
US4872406A (en) * | 1987-09-22 | 1989-10-10 | Heidelberger Druckmaschinen Aktiengesellschaft | Dampening mechanism for offset rotary printing presses |
US5090316A (en) * | 1989-04-19 | 1992-02-25 | Heidelberger Druckmaschinen Ag | Method and device for determining dampening-medium feed in an offset printing machine |
US5680815A (en) * | 1995-02-28 | 1997-10-28 | Man Roland Druckmaschinen Ag | Dampening unit for an offset printing machine |
US6349643B1 (en) * | 1995-04-28 | 2002-02-26 | Heidelberger Druckmaschinen | Method and device for influencing ink-trapping behavior |
US20040250723A1 (en) * | 2003-06-10 | 2004-12-16 | Heidelberger Druckmaschinen Ag | Method for metering dampening solution when printing with an offset press |
US20050241501A1 (en) * | 2004-05-03 | 2005-11-03 | Heidelberger Druckmaschinen Ag | Method for roller adjustment in a printing press |
US20090314171A1 (en) * | 2008-05-26 | 2009-12-24 | Heidelberger Druckmaschinen Aktiengesellschaft | Method for roller adjustment in a printing press and dampening unit of a printing press |
US20120224010A1 (en) * | 2011-03-04 | 2012-09-06 | Kasiske Jr W Charles | Printing method including web media moving apparatus |
US20120224009A1 (en) * | 2011-03-04 | 2012-09-06 | Kasiske Jr W Charles | Printing system including web media moving apparatus |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2849096C2 (de) * | 1978-11-11 | 1983-12-08 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg | Feuchtwerk |
DD144155B1 (de) * | 1979-06-06 | 1988-04-27 | Hans Johne | Feuchtwerk fuer rotations-offsetdruckmaschinen |
FR2561584B1 (fr) * | 1984-03-21 | 1987-06-26 | Marinoni Harris Sa | Dispositif de mouillage a film d'eau et son utilisation sur les groupes imprimants des presses offset |
DE3909985C1 (de) * | 1989-03-25 | 1990-04-26 | Man Roland Druckmaschinen Ag, 6050 Offenbach, De | |
DE4003412A1 (de) * | 1990-02-05 | 1991-08-08 | Koenig & Bauer Ag | Buerstenfeuchtwerk |
DE4431646A1 (de) | 1994-09-06 | 1996-03-07 | Koenig & Bauer Albert Ag | Dosierwalze an einem Feuchtwerk einer Offsetrotationsdruckmaschine |
DE29612105U1 (de) * | 1996-07-11 | 1996-08-22 | Man Roland Druckmaschinen Ag, 63069 Offenbach | Walze in einer Druckmaschine |
DE102005015791B4 (de) | 2004-05-03 | 2023-10-26 | Heidelberger Druckmaschinen Ag | Verfahren zur Walzenjustage in einer Druckmaschine |
DE102006026868A1 (de) * | 2006-06-09 | 2007-12-20 | Man Roland Druckmaschinen Ag | Auftragswerk für eine Rotationsdruckmaschine |
DE102007032979A1 (de) | 2007-07-16 | 2009-01-22 | Heidelberger Druckmaschinen Ag | Druckmaschinenwalze |
-
1970
- 1970-11-06 DE DE2054678A patent/DE2054678C3/de not_active Expired
-
1971
- 1971-10-19 US US00190491A patent/US3744414A/en not_active Expired - Lifetime
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3934506A (en) * | 1974-04-02 | 1976-01-27 | Adolph Gottscho, Inc. | Apparatus for imprinting intermittently advanced webs |
US4385559A (en) * | 1978-12-28 | 1983-05-31 | Roberto Jarach | Dampening device for offset printing machines for alternate and selective utilization of water or of a water-alcohol mixture |
US4669379A (en) * | 1984-05-17 | 1987-06-02 | Steffens Robert S | Ink transfer arrangement and method in a printing press |
WO1986002319A1 (en) * | 1984-10-11 | 1986-04-24 | Marcum Charles L | Dampening unit for printing press |
US4841855A (en) * | 1984-10-11 | 1989-06-27 | Marcum Charles L | Dampening unit for printing press |
US4872406A (en) * | 1987-09-22 | 1989-10-10 | Heidelberger Druckmaschinen Aktiengesellschaft | Dampening mechanism for offset rotary printing presses |
US5090316A (en) * | 1989-04-19 | 1992-02-25 | Heidelberger Druckmaschinen Ag | Method and device for determining dampening-medium feed in an offset printing machine |
US5680815A (en) * | 1995-02-28 | 1997-10-28 | Man Roland Druckmaschinen Ag | Dampening unit for an offset printing machine |
US6349643B1 (en) * | 1995-04-28 | 2002-02-26 | Heidelberger Druckmaschinen | Method and device for influencing ink-trapping behavior |
US6948431B2 (en) * | 2003-06-10 | 2005-09-27 | Heidelberger Druckmaschinen Ag | Method for metering dampening solution when printing with an offset press |
US20040250723A1 (en) * | 2003-06-10 | 2004-12-16 | Heidelberger Druckmaschinen Ag | Method for metering dampening solution when printing with an offset press |
US20050241501A1 (en) * | 2004-05-03 | 2005-11-03 | Heidelberger Druckmaschinen Ag | Method for roller adjustment in a printing press |
US7225735B2 (en) | 2004-05-03 | 2007-06-05 | Heidelberger Druckmaschinen Ag | Method for roller adjustment in a printing press |
CN1693075B (zh) * | 2004-05-03 | 2010-09-01 | 海德堡印刷机械股份公司 | 印刷机及印刷机中辊调整的方法 |
US20090314171A1 (en) * | 2008-05-26 | 2009-12-24 | Heidelberger Druckmaschinen Aktiengesellschaft | Method for roller adjustment in a printing press and dampening unit of a printing press |
US8215234B2 (en) | 2008-05-26 | 2012-07-10 | Heidelberger Druckmaschinen Ag | Method for roller adjustment in a printing press and dampening unit of a printing press |
CN101590713B (zh) * | 2008-05-26 | 2013-08-28 | 海德堡印刷机械股份公司 | 印刷机中的辊调整方法和印刷机的润湿装置 |
US20120224010A1 (en) * | 2011-03-04 | 2012-09-06 | Kasiske Jr W Charles | Printing method including web media moving apparatus |
US20120224009A1 (en) * | 2011-03-04 | 2012-09-06 | Kasiske Jr W Charles | Printing system including web media moving apparatus |
US8303107B2 (en) * | 2011-03-04 | 2012-11-06 | Eastman Kodak Company | Printing method including web media moving apparatus |
US8303106B2 (en) * | 2011-03-04 | 2012-11-06 | Eastman Kodak Company | Printing system including web media moving apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE2054678C3 (de) | 1975-05-22 |
DE2054678A1 (de) | 1972-10-26 |
DE2054678B2 (de) | 1973-04-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3744414A (en) | Dampening device for lithographic presses | |
US3433155A (en) | Mechanism for applying a coating to a plate | |
US4440081A (en) | Dampening-inking unit for offset printing machines | |
US4372244A (en) | Varnishing units on printing presses | |
US4242958A (en) | Ink duct for offset or relief printing machines | |
US3911815A (en) | Mechanism for dampening the printing plate of an offset printing press | |
US7395758B2 (en) | Ink fountain device with adjustable ink dams and adjustable fountain roller | |
US4782753A (en) | Printing couple for newspaper and periodical printing | |
US3366047A (en) | Skewing arrangement for plate cylinder and form rollers in printing press | |
US3504626A (en) | Printing press dampening control system | |
US4922818A (en) | Wetting/inking mechanism for offset printing presses | |
US3563173A (en) | Liquid-handling mechanism | |
JPS5952657A (ja) | オフセツト印刷機におけるインキ供給装置 | |
US5088407A (en) | Rotary printer for an envelope machine | |
ES8403066A1 (es) | Dispositivo para la regulacion del medio humedecedor dependiente del perfil de color en maquinas de imprenta. | |
US5460088A (en) | Printing press | |
US3902417A (en) | Wetting system for rotary offset printing presses | |
JPH0667611B2 (ja) | オフセツト輪転印刷機のための湿し装置 | |
JPS6038158A (ja) | オフセツト印刷機においてインキ量を調量するための装置 | |
GB2260515A (en) | Squeegee device for supplying ink in a stencil printing device. | |
US4627609A (en) | Sheet delivery device, especially for small offset printing machine | |
US3965819A (en) | Ink ductor system | |
JPS62104753A (ja) | オフセツト印刷機又は凸版印刷機のためのインキつぼ | |
US4981077A (en) | Dampening apparatus for lithographic press | |
EP0546029A4 (en) | Offset printing machine |