EP0374482B1 - Appareil pour prévenir le passage indésiré de fluide dans un dispositif de contrôle du flux - Google Patents

Appareil pour prévenir le passage indésiré de fluide dans un dispositif de contrôle du flux Download PDF

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Publication number
EP0374482B1
EP0374482B1 EP89121273A EP89121273A EP0374482B1 EP 0374482 B1 EP0374482 B1 EP 0374482B1 EP 89121273 A EP89121273 A EP 89121273A EP 89121273 A EP89121273 A EP 89121273A EP 0374482 B1 EP0374482 B1 EP 0374482B1
Authority
EP
European Patent Office
Prior art keywords
roller
nip
fluid
rollers
pan
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
EP89121273A
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German (de)
English (en)
Other versions
EP0374482A3 (fr
EP0374482A2 (fr
Inventor
Glenn Alan Guaraldi
Michael Skowron
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
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Filing date
Publication date
Application filed by Harris Graphics Corp filed Critical Harris Graphics Corp
Publication of EP0374482A2 publication Critical patent/EP0374482A2/fr
Publication of EP0374482A3 publication Critical patent/EP0374482A3/fr
Application granted granted Critical
Publication of EP0374482B1 publication Critical patent/EP0374482B1/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
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/26—Damping devices using transfer rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening

Definitions

  • the present invention relates to controlling fluid flow at a flow control location, and is particularly directed to an apparatus for use in applying a dampening fluid to a printing plate which receives ink and dampening fluid according to the preamble of claim 1.
  • a dampening system for a printing press typically includes a plurality of rollers for transferring dampening fluid to a printing plate during operation of the printing press.
  • the printing plate is secured to a plate cylinder of the printing press.
  • One of the plurality of rollers is a pan roller rotatable about its longitudinal central axis.
  • Another one of the plurality of rollers is a slip roller rotatable about its longitudinal central axis and located adjacent to the pan roller.
  • a nip is formed between the two rollers along the axial extent of the two rollers. The nip has a fluid entrance side at which fluid enters the nip and a fluid exit side from which fluid flows from the nip.
  • the pan roller rotates about its longitudinal central axis in one direction while the slip roller rotates about its longitudinal central axis in the opposite direction.
  • the pan and slip rollers rotate in the same direction.
  • the pan roller is partially immersed in a supply of dampening fluid, and the dampening fluid adheres to the outer surface of the pan roller as the pan roller rotates.
  • the fluid is carried on the outer surface of the pan roller to the entrance side of the nip.
  • the fluid enters the nip between the two rollers.
  • One way to control the amount of fluid transferred to the printing plate is to control the rotational speed of the pan roller and the rotational speed of the slip roller. An increase in the speed of each of the rollers increases the amount of fluid transferred to the printing plate. Likewise, a decrease in speed of each of the rollers decreases the amount of fluid transferred to the printing plate. Another way to control the amount of fluid transferred to the printing plate is to skew one of the two rollers along the axial extent of the two rollers. Still another way is to increase or decrease the pressure between the two rollers at the nip. Thus, the nip is a flow control location in the dampening system.
  • the Document US-A-2 275 514 discloses a structure for applying ink in which a ring is arranged at an end of a roller and extends into a recess located in another roller.
  • the ring acts to (1) seal the ends of the rollers against leaking of ink at the point where the rollers meet, (2) obstruct the lateral spreading of ink adjacent the end of the roller, and (3) carry the lateral spread ink around to a location where it is scraped from the ring.
  • Scraper members are used to remove the ink off the ring. The ink scraped off the ring is directed into an ink-well.
  • the present invention provides an apparatus for controlling fluid flow at a flow control location between two rollers.
  • the apparatus includes means connected at the opposite axial ends of one of the rollers for preventing undesired fluid flow past the flow control location.
  • the apparatus of the present invention is particularly suitable for use in a dampening system of a printing press.
  • the apparatus includes a pan roller having a collar fixedly connected at each of the opposite axial ends of the pan roller.
  • the pan roller is partially immersed in a fluid pan filled with dampening fluid.
  • the pan roller is disposed adjacent to a slip roller to form a nip between the pan roller and the slip roller.
  • the nip has an entrance side and an exit side and extends along the axial direction of the pan and slip rollers.
  • the slip roller is disposed adjacent to a vibrator roller which, in turn, is disposed adjacent to a form roller.
  • the form roller is disposed adjacent to a printing plate secured to a plate cylinder of a printing press.
  • the rollers are rotatable about their longitudinal central axes.
  • the pan roller is rotated about its longitudinal central axis to carry fluid on its outer surface from the fluid pan to the entrance side of the nip.
  • the fluid at the nip is either transferred onto the outer surface of the slip roller or remains adhered to the outer surface of the pan roller.
  • the fluid on the outer surface of the pan roller is carried back into the fluid pan.
  • the fluid transferred onto the outer surface of the slip roller is subsequently transferred to the printing plate.
  • the excess fluid tends to flow to the opposite axial ends of the nip.
  • some of this fluid drips back into the fluid pan due to gravity.
  • some of the excess fluid is prevented from flowing around the opposite axial ends of the nip onto the slip roller by the collars at the opposite axial ends of the pan roller.
  • the two collars rotate with the pan roller about the longitudinal central axis of the pan roller.
  • the two collars pick up excess fluid at the opposite axial ends of the nip and move the excess fluid away from the slip roller.
  • This fluid is transferred back into the fluid pan by rotation of the collars with the pan roller.
  • the present invention relates to a fluid flow control apparatus for preventing undesired transfer of a fluid past a flow control location.
  • the application and construction of the apparatus of the present invention may vary.
  • the apparatus of the present invention is particularly suitable for use in a dampening system of a printing press and will be described herein as applied thereto.
  • a dampening system for use in a printing press, constructed in accordance with the present invention, is illustrated in Fig. 1.
  • the dampening system 10 includes a pan roller 12 partially immersed in a fluid pan 14 filled with a dampening solution.
  • a typical dampening solution includes water, alcohol, and gum arabic.
  • the pan roller 12 is rotatable about its longitudinal central axis 25 and has a cylindrical outer surface.
  • the longitudinal central axis 25 of the pan roller 12 lies on a vertical line 19.
  • the outer surface of the pan roller 12 as is conventional is made of a chrome material.
  • the pan roller 12 is located adjacent to a slip roller 16.
  • the slip roller 16 is rotatable about its longitudinal central axis 27 and has a cylindrical outer surface.
  • a line 21 extends through the longitudinal central axis 27 of the slip roller 16 and the longitudinal central axis 25 of the pan roller 12.
  • the position of the slip roller 16 relative to the position of the pan roller 12 is such that the lines 19 and 21 intersect to form a predetermined angle therebetween.
  • the outer surface of the slip roller 16 as is conventional is made of a rubber material.
  • a nip 18 is formed between the pan roller 12 and the slip roller 16 along the axial extent of the two rollers 12, 16.
  • the nip 18 has a fluid entrance side 11 and a fluid exit side 13.
  • the entrance side 11 of the nip 18 and the exit side 13 of the nip 18 are located on opposite sides of the line 21.
  • One side of the line 21 is at a higher elevation than the other side of the line 21.
  • the entrance side 11 of the nip 18 is on the side of the line 21 at the higher elevation.
  • the exit side 13 of the nip is on the side of the line 21 at the lower elevation.
  • the slip roller 16 is located adjacent to a vibrator roller 20.
  • the vibrator roller 20, in turn, is located adjacent to a form roller 22.
  • the vibrator roller 20 and the form roller 22 have cylindrical outer surfaces and are rotatable about their respective longitudinal central axes.
  • the form roller 22 is disposed adjacent to a printing plate 23 secured to a printing plate cylinder 24 of the printing press.
  • the pan roller 12 rotates about its longitudinal central axis 25 in one direction, while the slip roller 16 rotates about its longitudinal central axis 27 in the opposite direction.
  • the pan roller 12 is rotating in the clockwise direction and the slip roller 16 is rotating in the counterclockwise direction.
  • the pan and slip rollers 12, 16 rotate in the same direction at the nip 18 between the pan roller 12 and the slip roller 16. Since the pan roller 12 is partially immersed in the fluid pan 14, the dampening fluid in the fluid pan 14 adheres to the outer surface of the pan roller 12 as the pan roller 12 rotates about its longitudinal central axis 25. The fluid adheres to the outer surface of the pan roller 12 because of the affinity between the fluid and the chrome outer surface of the pan roller 12.
  • the fluid is carried on the outer surface of the pan roller 12 from the fluid pan 14 to the entrance side 11 of the nip 18 between the pan roller 12 and the slip roller 16.
  • the fluid at the entrance side 11 of the nip 18 moves through the nip 18 to the exit side 13 of the nip 18 as the two rollers 12, 16 continue to rotate about their longitudinal central axes 25, 27. Since the entrance side 11 of the nip 18 is at a higher elevation than the exit side 13 of the nip 18, gravity assists in the movement of the fluid through the nip 18.
  • the slip roller 16 continues to rotate about its longitudinal central axis 27, the fluid carried on the outer surface of the slip roller 16 is transferred onto the outer surface of the vibrator roller 20.
  • the vibrator roller 20 transfers the fluid on its outer surface to the outer surface of the form roller 22.
  • the fluid carried on the outer surface of the form roller 22 is transferred onto the outer surface of the printing plate 23.
  • the pan roller 12, the slip roller 16, the vibrator roller 20, and the form roller 22 of the dampening system 10 cooperate together to transfer fluid from the fluid pan 14 to the outer surface of the printing plate 23 secured to the plate cylinder 24 of the printing press.
  • the amount of fluid transferred from the fluid pan 14 to the printing plate 23 can be varied.
  • One way to vary the amount of fluid transferred from the fluid pan 14 to the printing plate 23 is to change the rotational speed of either the pan roller 12 or the slip roller 16.
  • a speed control mechanism 38 as known in the art, for varying the rotational speed of either the pan roller 12 or the slip roller 16 is operatively connected to the two rollers 12, 16 as schematically illustrated in Fig. 1.
  • the speed control mechanism 38 can be one of a multitude of conventional designs. Thus, details of its construction will not be discussed.
  • An increase in the speed of either of the two rollers 12, 16 increases the amount of fluid transferred to the printing plate 23.
  • a decrease in the speed of either of the two rollers 12, 16 decreases the amount of fluid transferred to the printing plate 23.
  • Another way to control the amount of fluid transferred from the fluid pan 14 to the printing plate 23 is to skew the pan roller 12 relative to the slip roller 16 along the axial extent of the two rollers 12, 16.
  • the contact pressure between the two rollers 12, 16 changes.
  • An increase in the contact pressure between the two rollers 12, 16 decreases the amount of fluid transferred from the fluid pan 14 to the printing plate 23.
  • a decrease in the contact pressure, up to a certain point, increases the amount of fluid transferred from the fluid pan 14 to the printing plate 23.
  • the amount of fluid transferred from the fluid pan 14 to the printing plate 23 can also be controlled by varying the size of the nip 18 between the pan roller 12 and the slip roller 16.
  • the contact pressure between the two rollers 12, 16 varies as a function of the size of the nip 18 between the two rollers 12, 16.
  • the amount of fluid transferred from the pan roller 12 to the slip roller 16 varies as a function of the contact pressure between the two rollers 12, 16 in the manner as described hereinabove.
  • An adjustment mechanism 40 as known in the art, for adjusting the size of the contact area between the pan roller 12 and the slip roller 16 is operatively connected to the two rollers 12, 16 as schematically illustrated in Fig. 1.
  • the adjustment mechanism 40 can be one of a multitude of conventional designs. Thus, details of its construction will not be discussed.
  • the fluid in the nip 18 is either transferred onto the outer surface of the slip roller 16 or remains adhered to the outer surface of the pan roller 12 as the two rollers 12, 16 continue to rotate about their longitudinal central axes 25, 27.
  • the amount of fluid flowing out of the nip 18 at the exit side 13 of the nip 18 is the sum of the amount of fluid on the outer surface of the pan roller 12 and the amount of fluid on the outer surface of the slip roller 16.
  • a buildup of excess fluid at the entrance side 11 of the nip 18 occurs if the amount of fluid transferred from the fluid pan 14 to the entrance side 11 of the nip 18 exceeds the amount of fluid flowing out of the nip 18 at the exit side 13 of the nip 18.
  • the excess fluid which builds up at the entrance side 11 of the nip 18 tends to flow to the opposite axial ends of the nip 18. Most of the excess fluid flowing to the opposite axial ends of the nip 18 eventually flows off the opposite axial ends of the pan roller 12 back into the fluid pan 14. Some of the excess fluid at the opposite axial ends of the nip 18 tends to flow around the opposite axial ends of the nip 18 onto the slip roller 16. This tendency occurs because of the greater affinity between the fluid and rubber outer surface of the slip roller 16 relative to the affinity between the fluid and chrome outer surface of the pan roller 12, and the flow characteristics of the dampening solution.
  • a collar 30 is secured to the pan roller 12 at one axial end 15 of the pan roller 12.
  • the collar 30 is made of a brass material.
  • the brass collar 30 has a shape like a ring with an outer diameter greater than the outer diameter of the pan roller 12.
  • the brass collar 30 is made of two separate pieces. Each piece has a semi-circular shape and forms one-half of the brass collar 30. The two pieces are held together by suitable fasteners. When the fasteners are tightened to hold the two pieces together, the brass collar 30 is fixedly secured to the pan roller 12.
  • a brass collar 35 identical to the brass collar 30 is fixedly secured to the pan roller 12 at the other axial end 17 of the pan roller 12.
  • the two brass collars 30, 35 located at the two opposite axial ends 15, 17, respectively, of the pan roller 12 are used to pick up the excess fluid at the opposite axial ends of the nip 18. Since the function of each of the brass collars 30, 35 is identical to the other collar, only the brass collar 30 at the one axial end 15 of the pan roller 12 will be described in detail.
  • the affinity between the fluid and the brass collar 30 located at the axial end 15 of the pan roller 12 is greater than the affinity between the fluid and the rubber outer surface of the slip roller 16. This greater affinity between the fluid and the brass collar 30 tends to pick up the excess fluid at the axial end of the nip 18 as the brass collar 30 rotates with the pan roller 12.
  • the preferred embodiment described hereinbefore includes the pair of collars 30, 35 in which the collars are disposed at the opposite axial ends 15, 17 of the pan roller 12.
  • the two collars 30, 35 could instead be disposed at the opposite axial ends of the slip roller 16.
  • only one collar be used instead of two collars.
  • the collar would be disposed at one axial end of either the pan roller 12 or the slip roller 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (10)

  1. Dispositif destiné à être utilisé pour appliquer un fluide d'humectation à une plaque d'impression (23) qui reçoit de l'encre et du fluide d'humectation comprenant une source (14) de fluide d'humectation, un premier rouleau (12) pouvant tourner sur son axe central longitudinal (25) et présentant une surface extérieure cylindrique pour recevoir du fluide d'humectation provenant de ladite source (14), un deuxième rouleau (16) pouvant tourner sur son axe central longitudinal (27) et présentant une surface extérieure cylindrique, la surface extérieure dudit deuxième rouleau (16) et la surface extérieure dudit première rouleau (12) définissant une ligne de contact (18) entre lesdits premier et deuxième rouleaux, du fluide d'humectation pouvant être transféré au niveau de ladite ligne de contact (18) de la surface extérieure dudit premier rouleau (12) à la surface extérieure dudit deuxième rouleau (16), ladite ligne de contact (18) présentant un côté d'entrée (11) auquel ledit premier rouleau (12) transporte du fluide d'humectation jusqu'à ladite ligne de contact (18) et un côté de sortie (13) auquel lesdits premier et deuxième rouleaux (12, 16) transportent du fluide d'humectation en s'éloignant de ladite ligne de contact (18), un excès de fluide se produisant au côté d'entrée (11) de ladite ligne de contact (18) si la quantité de fluide d'humectation transportée jusqu'à ladite ligne de contact (18) excède la quantité de fluide d'humectation que lesdits premier et deuxième rouleaux (12, 16) emmènent à partir de ladite ligne de contact (18), et des moyens pour empêcher l'écoulement de fluide du fluide d'humectation en excès au côté d'entrée (11) de ladite ligne de contact (18) sur l'une des extrémités axiales de ladite ligne de contact (18) jusqu'au côté de sortie (13) de ladite ligne de contact (18), caractérisé en ce que lesdits moyens sont constitués uniquement d'un ou de deux colliers (30, 35) disposés à ladite extrémité axiale ou aux deux extrémités axiales, respectivement, de ladite ligne de contact (18) sur ledit premier rouleau (12) et pouvant tourner avec eux pour faire retourner le fluide d'humectation en excès du côté d'entrée (11) de ladite ligne de contact (18) directement à ladite source (14).
  2. Dispositif selon la revendication 1, comprenant en outre des moyens (38) reliés en fonctionnement auxdits premier et deuxième rouleaux (12, 16) pour commander la vitesse de rotation dudit premier rouleau sur son axe central longitudinal (25) et la vitesse de rotation dudit deuxième rouleau sur son axe central longitudinal (27).
  3. Dispositif selon la revendication 1, comprenant en outre des moyens (40) reliés en fonctionnement auxdits premier et deuxième rouleaux (12, 16) pour régler la pression de contact au niveau de la ligne de contact (18) entre lesdits premier et deuxième rouleaux.
  4. Dispositif selon la revendication 1, dans lequel un premier axe (19) s'étend verticalement et croise perpendiculairement l'axe central longitudinal (25) dudit premier rouleau (12) et un deuxième axe (21) croise perpendiculairement l'axe central longitudinal dudit premier rouleau et l'axe central longitudinal (27) dudit deuxième rouleau (16), les premier et deuxième axes se coupant sous un angle prédéterminé, les côtés d'entrée et de sortie (11, 13) de ladite ligne de contact (18) étant disposés sur les côtés opposés du deuxième axe, le côté d'entrée (11) de ladite ligne de contact (18) étant à une hauteur verticale plus élevée que le côté de sortie (13) de ladite ligne de contact (18).
  5. Dispositif selon la revendication 1, dans lequel ledit collier (30) a une forme d'anneau cylindrique.
  6. Dispositif selon la revendication 1, dans lequel le diamètre extérieur dudit collier (30) est supérieur au diamètre extérieur dudit premier rouleau (12) sur lequel est disposé ledit collier.
  7. Dispositif selon la revendication 1, dans lequel ledit collier (30) est réalisé dans un matériau de laiton.
  8. Dispositif selon la revendication 1, comprenant en outre un autre collier (35) disposé à l'autre extrémité axiale de ladite ligne de contact (18) et sur ledit premier rouleau (12), chacun desdits colliers (30, 35) ayant une forme d'anneau cylindrique.
  9. Dispositif selon la revendication 8, dans lequel le diamètre extérieur de chacun desdits colliers (30, 35) est supérieur au diamètre extérieur dudit rouleau (12).
  10. Dispositif selon la revendication 8, dans lequel chacun desdits colliers (30, 35) est réalisé dans un matériau de laiton.
EP89121273A 1988-12-23 1989-11-17 Appareil pour prévenir le passage indésiré de fluide dans un dispositif de contrôle du flux Expired - Lifetime EP0374482B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28961288A 1988-12-23 1988-12-23
US289612 1988-12-23

Publications (3)

Publication Number Publication Date
EP0374482A2 EP0374482A2 (fr) 1990-06-27
EP0374482A3 EP0374482A3 (fr) 1991-01-16
EP0374482B1 true EP0374482B1 (fr) 1994-07-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121273A Expired - Lifetime EP0374482B1 (fr) 1988-12-23 1989-11-17 Appareil pour prévenir le passage indésiré de fluide dans un dispositif de contrôle du flux

Country Status (3)

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EP (1) EP0374482B1 (fr)
JP (1) JP2573703B2 (fr)
DE (1) DE68916922T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016007574A1 (de) * 2016-06-21 2017-12-21 Fresenius Medical Care Deutschland Gmbh Zweikomponentige Abtropfkante

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275514A (en) * 1939-05-08 1942-03-10 Miehle Printing Press & Mfg Ink fountain structure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE472509A (fr) *
GB293157A (en) * 1927-05-10 1928-07-05 Percy Gotch Robinson Improvements in or relating to inking apparatus for printing machines
FR1374410A (fr) * 1963-07-16 1964-10-09 Procédé et appareil pour mouiller des clichés pour l'impression lithographique en offset
BR7302384D0 (pt) * 1972-04-04 1974-06-27 Dick Co Ab Aperfeicoamentos em ou relativos a limpeza de rolos de umaaperfeicoamentos em ou relativos a limpeza de rolos de uma maquina duplicadora como rolos de tinta maquina duplicadora como rolos de tinta
CA1011995A (en) * 1972-08-14 1977-06-14 Dahlgren Manufacturing Company Liquid applicator for lithographic systems
JPS57123060A (en) * 1981-01-22 1982-07-31 Komori Printing Mach Co Ltd Damping device for press
JPS61290053A (ja) * 1985-06-17 1986-12-20 Toshiba Mach Co Ltd オフセツト印刷機の過剰湿し水除去機構

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275514A (en) * 1939-05-08 1942-03-10 Miehle Printing Press & Mfg Ink fountain structure

Also Published As

Publication number Publication date
JP2573703B2 (ja) 1997-01-22
JPH02215531A (ja) 1990-08-28
EP0374482A3 (fr) 1991-01-16
DE68916922T2 (de) 1994-11-03
EP0374482A2 (fr) 1990-06-27
DE68916922D1 (de) 1994-08-25

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