EP0180134B1 - Farbkasten und geteiltes Farbmesser - Google Patents

Farbkasten und geteiltes Farbmesser Download PDF

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Publication number
EP0180134B1
EP0180134B1 EP19850113431 EP85113431A EP0180134B1 EP 0180134 B1 EP0180134 B1 EP 0180134B1 EP 19850113431 EP19850113431 EP 19850113431 EP 85113431 A EP85113431 A EP 85113431A EP 0180134 B1 EP0180134 B1 EP 0180134B1
Authority
EP
European Patent Office
Prior art keywords
metering
screw
segments
ink
fountain
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
Application number
EP19850113431
Other languages
English (en)
French (fr)
Other versions
EP0180134A3 (en
EP0180134A2 (de
Inventor
Kevin John O'dea
David Joseph Mccooey
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.)
Harris Graphics Corp
Original Assignee
Harris Graphics Corp
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 Harris Graphics Corp filed Critical Harris Graphics Corp
Publication of EP0180134A2 publication Critical patent/EP0180134A2/de
Publication of EP0180134A3 publication Critical patent/EP0180134A3/en
Application granted granted Critical
Publication of EP0180134B1 publication Critical patent/EP0180134B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2231/00—Inking devices; Recovering printing ink
    • B41P2231/12—Axially segmented ink blades

Definitions

  • the present invention relates to an ink fountain for printing presses according to the preamble of claim 1.
  • a spring is employed to bias the metering segments toward the fountain roll and in the latter of such above-mentioned patents, a power actuator is employed to overcome the spring force and pull the metering segments back from the roll.
  • the ink fountain system provides a spring applying a spring force to the metering segment, urging the associated segments toward the fountain roll surface in combination with a screw-type actuator which operates to adjust the spacing between the metering edge of the metering segment and the fountain roll surface.
  • Extreme accuracy of the position of the metering segments is provided in accordance with this aspect of this invention because the spring provides a preload on the actuator which takes up all of the clearances in the threads and in the connections between the actuator and the segments and base.
  • the spring therefore, eliminates backlash-caused positional inaccuracy of the metering segments, as well as any positional inaccuracy resulting from clearances in the various connections. This allows the use of actuator parts which need not be manufactured with extreme precision without the loss of accurate metering. Consequently, the manufacturing costs are reduced and a reasonable amount of wear can be tolerated, so maintenance costs are also reduced.
  • the actuator system is also arranged so that it cannot cause a metering segment to engage the fountain roll surface with excessive force, and thereby prevents unnecessary damage to either part.
  • the maximum force that may be applied to the metering segment in the direction of the fountain roll surface is the force of the spring, and the actuator screw cannot apply a force to the metering segment in the direction of the fountain roll surface.
  • a pivot connection is provided between the actuator and the metering segment in which the only force that can be applied from the actuator to the metering segment is in the direction toward or away from the surface of the fountain roll. Therefore, the metering segments of the system are free to align themselves with respect to the fountain roll surface.
  • Such structural arrangement allows the metering segments to float within limits and to compensate for variations in the size and shape of the metering segments resulting from manufacturing tolerances or the like.
  • an improved system in which the metering segments can be easily removed and replaced without any substantial disassembly of the fountain structure.
  • metering segment removal is accomplished by simply pivoting the fountain down away from the fountain roll so as to provide access to the metering segments and threading the metering segment off the end of the drive screw of the actuator.
  • FIG. 1 illustrates an ink fountain in accordance with the present invention in its normal operative position.
  • the fountain includes a frame or housing 10 which is journaled on a pivot 11 and is releasably locked in its operative position by a toggle assembly 12. In such operative position, metering segments 13 are positioned adjacent to the surface 14 of a fountain roll 16.
  • the fountain roll is supported on a shaft 17 for rotation about the axis of such shaft.
  • ink contained within the ink trough, indicated generally at 18, is carried along the surface 14 of the fountain roll past the metering edge 19 of the metering segments for subsequent transfer to other rolls (not illustrated).
  • a plurality of similar metering segments 13 are positioned in alignment along the length of the housing 10 and cooperate to establish the desired film thickness of the ink on the surface 14.
  • the individual metering segments are individually adjustable toward and away from the surface 14 so as to permit variations in the ink film thickness at various zones along the length of the fountain roll adjacent to the individual metering segments.
  • the metering segments 13 are rectangular blocks providing an upper surface 21 and a parallel lower surface 22, the latter of which engages a support surface 23 on the housing 10.
  • the metering edge 19 is formed by the intersection of the upper surface 21 and a forward end surface 24.
  • a spacer plate 26 is positioned across the housing 10 behind the segments 13 and is also supported on the surface 23 of the housing 10.
  • the thickness of the spacer plate 26 is slightly greater than the thickness of the metering segments 13 so that a cover plate 27 mounted on the upper surface of plate 26 extends along the upper surface 21 of the metering segments 13 with slight clearance so that the metering segments can be adjusted.
  • the cover plate and the surface 23 cooperate to provide opposed guide surfaces which guide the metering segments in their movement toward and away from the fountain roll surface 14.
  • the spacer plate 26 is provided with a step bore 31 in alignment with the center of each of the metering segments 13 providing a shoulder 32 spaced back from the rearward surface 33 of the metering segments 13.
  • a spring 34 is positioned within the step bore 31 and extends between the shoulder 32 and the rearward surface 33. The spring 34 is sized so that it is compressed in position and exerts a spring force on the associated metering segment 13, urging such metering segment in a direction toward the fountain roll surface 14.
  • a screw actuator is provided for each of the metering segments and includes a screw 36 provided with threads 37 at its forward end. Such screw 36 extends with clearance through the step bore 31 and the spring 34 into a blind bore 38 in the associated metering segment 13. Such blind bore 38 is sized to provide clearance with respect to the screw 36.
  • a nut 39 provides a threaded bore 41 which receives the threads 37 of the screw 36.
  • Such nut is provided with a cylindrical outer surface 42 which is positioned in a cross bore 43 in the associated metering segment 13.
  • Such cylindrical nut and cross bore provide a pivot connection between the nut 39 and the associated metering segment 13.
  • the height of the nut 39 is selected to be less than the thickness of the metering segment 13, as best illustrated in FIG. 3, so that the nut is free to float within the cross bore 43.
  • a shoulder 46 is provided on the rearward end of the screw 36 and is normally held by the spring 34 in engagement with the rearward surface 47 of the spacer plate 26. Engagement between the shoulder 46 and the surface 47 limits the movement of the screw 36 to the right (as viewed in FIGS. 2 and 3) to the position illustrated in such figures. However, the structure of the screw is such that the screw can move against the action of the spring 34 to the left from the illustrated position, as discussed in greater detail below.
  • each screw is provided with a motor 51 providing an output shaft 52 (illustrated in FIG. 3) which fits into a bore 53 in the outer end 54 of the screw and provides a cross pin 56 which is positioned in an axial slot 57 in the end of the screw. In its position, the cross pin 56 is spaced from the inner end of the slot and the drive shaft 52 is spaced from the inner end of the bore 53 so that the motor allows the screw 36 to move to the left from the illustrated position.
  • a motor 51 providing an output shaft 52 (illustrated in FIG. 3) which fits into a bore 53 in the outer end 54 of the screw and provides a cross pin 56 which is positioned in an axial slot 57 in the end of the screw. In its position, the cross pin 56 is spaced from the inner end of the slot and the drive shaft 52 is spaced from the inner end of the bore 53 so that the motor allows the screw 36 to move to the left from the illustrated position.
  • each of the springs 34 provides a spring bias on the associated metering segment urging such metering segment toward the surface 14 of the fountain roll.
  • the screw 36 in cooperation with a nut 39, however, operates to overcome the action of the spring 34 and moves the metering segment 13 against the action of the spring away from the surface 14 of the fountain roll 16 to the desired adjusted position. In such condition, however, all of the backlash in the threads of the screw 36 and nut 39 are taken up by the force of the spring. Further, any looseness between the nut 39 and the cross bore 43 is also taken up by the action of the spring. Consequently, each metering segment 13 is precisely positioned with respect to the surface 14 by the screw 36 and nut 39 associated therewith.
  • each spring 34 is selected to provide a force sufficient to overcome any hydrodynamic forces on the blade and to assure that the position of the metering segment is accurately and precisely determined by the adjustment of the associated actuator system.
  • the actuator cannot exert any forces on the associated metering segment except forces in the direction of the axis of the screw. Consequently, each of the metering segments is free to float with respect to the trough housing assembly and to align itself properly with the surface 14 of the fountain roll. Consequently, slight imperfections in the dimensional accuracy of the various components of the system do not adversely effect the accuracy of the metering of the ink.
  • the metering segments are sized as to provide a small amount of lateral clearance within the assembly and such clearance is filled with a grease to prevent leakage of the ink.
  • a greasing system substantially as illustrated in U.S. Letters Patent No. 4,000,695 may be utilized to ensure that a good coating of grease is maintained along the various surfaces of the metering segments to prevent objectionable leaking of ink through the clearances between mating surfaces. Such patent is incorporated by reference for such disclosure.
  • the toggle 12 can be released to allow the housing 10 to pivot down around the pivot 11 to a lowered or service position illustrated in which the metering segments can be easily removed.
  • the cover plate is spaced back from the fountain roll a distance at least as great as the length of the metering segments.
  • segment removal is required, the screw associated with the particular metering segment that is to be removed is rotated until the nut 39 threads off the end of the screw 36. The segment is then merely lifted out, as illustrated in phantom, and removed front the machine. Subsequently, a replacement metering segment can be reinstalled and coupled by merely threading the screw into the nut mounted within the metering segment.
  • the housing 10 is raised up to its operative position of FIG. 1 and the toggle 12 locks it in such position.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (3)

  1. Farbwerk für Druckerpressen, mit einer drehbar gelagerten Farbwalze (16), einem an die Farbwalze angrenzenden Farbbehälter (18) und einer Mehrzahl von Dosiersegmenten (13), welche am Farbbehälter (18) längs einer geradlinigen Bahn beweglich montiert sind, so dass sie gegen den Umfang (14) der Farbwalze (16) und von dieser weg bewegbar sind, wobei die Farbwalze (16) in Zusammenarbeit mit dem Farbbehälter (18) und den Dosiersegmenten (13) ein Farbreservoir definiert, welches beim Drehen der Farbwalze (16) dessen Oberflächen mit Farbe überzieht, und mit den Dosiersegmenten (13) einzeln zugeordneten Schraubentrieben, welche eine mit dem Farbbehälter (18) verbundene Schraubenspindel (36) aufweisen, bei deren Drehung in der einen Richtung die zugeordneten Dosiersegmente (13) gegen die Farbwalze (16) und bei deren Drehung in der anderen Richtung die zugeordneten Dosiersegmente (13) von der Farbwalze (16) weg bewegt werden, dadurch gekennzeichnet, dass eine mit der Schraubenspindel (36) zusammenarbeitende Schraubenmutter (39) mit dem zugeordneten Dosiersegment (13) drehbar verbunden ist, welche Drehverbindung es den Dosiersegmenten (13) ermöglicht, sich bezüglich der Farbwalze (16) selbst auszurichten.
  2. Farbwerk nach Anspruch 1, gekennzeichnet durch Federmittel (34), welche auf die Dosiersegmente (13) längs deren Bewegungsbahn einwirken, und dass die Schraubenspindel (36) und die Schraubenmutter (39), welche zwischen dem Farbbehälter (18) und den zugeordneten Dosiersegmenten (13) miteinander verbunden sind, bewirken, dass sie bei einer relativen Drehung zwischen Schraubenspindel (36) und Schraubenmutter (39) in der einen Richtung die Kraft der Federmittel (34) überwinden und die Dosierelemente (13) in der einen Richtung längs der Bewegungsbahn bewegen und dass bei einer relativen Drehung zwischen Schraubenspindel (36) und Schraubenmutter (39) in der entgegengesetzten Richtung die Federmittel (34) die Dosiersegmente (13) in der entgegengesetzten Richtung längs der Bewegungsbahn bewegen, wobei die Federmittel (34) das Spiel in dem Schraubentrieb und dessen Verbindungen mit dem Farbbehälter (18) und den Dosiersegmenten (13) aufheben, so dass durch die Drehlage von Schraubenspindel (36) und Schraubenmutter (39) das Dosiersegment (13) bezüglich der Farbwalze (16) genau positioniert ist.
  3. Farbwerk nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Schraubenmuttern (39) eine zylindrische Aussenfläche (42) aufweisen und in einer Querbohrung (43) der Dosiersegmente (13) angeordnet sind, um die genannte Drehverbindung zu bilden.
EP19850113431 1984-10-29 1985-10-23 Farbkasten und geteiltes Farbmesser Expired EP0180134B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66596184A 1984-10-29 1984-10-29
US665961 1984-10-29

Publications (3)

Publication Number Publication Date
EP0180134A2 EP0180134A2 (de) 1986-05-07
EP0180134A3 EP0180134A3 (en) 1988-04-20
EP0180134B1 true EP0180134B1 (de) 1991-12-27

Family

ID=24672249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850113431 Expired EP0180134B1 (de) 1984-10-29 1985-10-23 Farbkasten und geteiltes Farbmesser

Country Status (3)

Country Link
EP (1) EP0180134B1 (de)
JP (1) JPS61108600A (de)
DE (1) DE3585020D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0388757A1 (de) * 1989-03-20 1990-09-26 Elettra S.R.L. Drückgerät in einem Apparat zum Reinigen des Gummituchzylinders einer Druckmaschine
US5025676A (en) * 1989-07-03 1991-06-25 Perretta Graphics Corporation Screw adjustment mechanism with pre-set backlash
JPH0383644A (ja) * 1989-08-29 1991-04-09 Maeda Itsuseishiya:Kk 印刷機のインキ調整装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583640A (en) * 1949-02-08 1952-01-29 Time Inc Sectional blade ink fountain for printing presses
US3730090A (en) * 1971-02-16 1973-05-01 North American Rockwell Adjusting arrangement for ink fountain blade
CA1069380A (en) * 1976-10-29 1980-01-08 Allan R. Prittie Printing and die-cutting apparatus
DE3109630A1 (de) * 1980-05-08 1982-02-04 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Wascheinrichtung fuer farbwerke
FR2527987B1 (fr) * 1982-06-04 1986-06-20 Creusot Loire Dispositif d'encrage a lame basse a cuvettes d'encrier amovibles
DE3311113C1 (de) * 1983-03-26 1988-05-05 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Dosierelemente in Farbkaesten von Offsetdruckmaschinen

Also Published As

Publication number Publication date
DE3585020D1 (de) 1992-02-06
JPS61108600A (ja) 1986-05-27
EP0180134A3 (en) 1988-04-20
EP0180134A2 (de) 1986-05-07
JPH0363953B2 (de) 1991-10-03

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