EP0374482A2 - 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 fluxInfo
- Publication number
- EP0374482A2 EP0374482A2 EP89121273A EP89121273A EP0374482A2 EP 0374482 A2 EP0374482 A2 EP 0374482A2 EP 89121273 A EP89121273 A EP 89121273A EP 89121273 A EP89121273 A EP 89121273A EP 0374482 A2 EP0374482 A2 EP 0374482A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nip
- roller
- fluid
- rollers
- collar
- 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
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
-
- 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 preventing undesired fluid flow past a flow control location defined by a nip formed by a pair of rollers.
- the apparatus of the present invention is especially applicable to a dampening system of a printing press.
- 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 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 slip roller 16 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 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 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 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 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 end 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 end of either the pan roller 12 or the slip roller 16.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
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 true EP0374482A2 (fr) | 1990-06-27 |
EP0374482A3 EP0374482A3 (fr) | 1991-01-16 |
EP0374482B1 EP0374482B1 (fr) | 1994-07-20 |
Family
ID=23112288
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)
Country | Link |
---|---|
EP (1) | EP0374482B1 (fr) |
JP (1) | JP2573703B2 (fr) |
DE (1) | DE68916922T2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017220470A1 (fr) * | 2016-06-21 | 2017-12-28 | Fresenius Medical Care Deutschland Gmbh | Dispositif de dérivation contrôlée de liquides avec un bord d'égouttage à deux composants |
Citations (7)
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 |
US2275514A (en) * | 1939-05-08 | 1942-03-10 | Miehle Printing Press & Mfg | Ink fountain structure |
FR1374410A (fr) * | 1963-07-16 | 1964-10-09 | Procédé et appareil pour mouiller des clichés pour l'impression lithographique en offset | |
FR2179436A5 (fr) * | 1972-04-04 | 1973-11-16 | Dick Co Ab | |
FR2196249A1 (fr) * | 1972-08-14 | 1974-03-15 | Dahlgren Mfg Co | |
JPS57123060A (en) * | 1981-01-22 | 1982-07-31 | Komori Printing Mach Co Ltd | Damping device for press |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
1989
- 1989-11-17 EP EP89121273A patent/EP0374482B1/fr not_active Expired - Lifetime
- 1989-11-17 DE DE1989616922 patent/DE68916922T2/de not_active Expired - Fee Related
- 1989-12-22 JP JP1334634A patent/JP2573703B2/ja not_active Expired - Lifetime
Patent Citations (7)
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 |
US2275514A (en) * | 1939-05-08 | 1942-03-10 | Miehle Printing Press & Mfg | Ink fountain structure |
FR1374410A (fr) * | 1963-07-16 | 1964-10-09 | Procédé et appareil pour mouiller des clichés pour l'impression lithographique en offset | |
FR2179436A5 (fr) * | 1972-04-04 | 1973-11-16 | Dick Co Ab | |
FR2196249A1 (fr) * | 1972-08-14 | 1974-03-15 | Dahlgren Mfg Co | |
JPS57123060A (en) * | 1981-01-22 | 1982-07-31 | Komori Printing Mach Co Ltd | Damping device for press |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 6, no. 216 (M-168)(1094) 29 October 1982, & JP-A-57 123060 (KOMORI INSATSU KIKAI K.K.) 31 July 1982, * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017220470A1 (fr) * | 2016-06-21 | 2017-12-28 | Fresenius Medical Care Deutschland Gmbh | Dispositif de dérivation contrôlée de liquides avec un bord d'égouttage à deux composants |
US11420437B2 (en) | 2016-06-21 | 2022-08-23 | Fresenius Medical Care Deutschland Gmbh | Two-component drip edge |
Also Published As
Publication number | Publication date |
---|---|
EP0374482B1 (fr) | 1994-07-20 |
EP0374482A3 (fr) | 1991-01-16 |
DE68916922T2 (de) | 1994-11-03 |
DE68916922D1 (de) | 1994-08-25 |
JPH02215531A (ja) | 1990-08-28 |
JP2573703B2 (ja) | 1997-01-22 |
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