US3842735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing apparatus and wash-up device
Assignee: Harris Graphics Corp
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Filing: 1972-12-22
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Granted: 1974-10-22
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Expires: 1992-12-22
Abstract
Abstract Lithographic dampener has a hydrophilic roller for supplying dampening solution to a resilient dampener form roller capable of carrying ink and dampening solution. The dampener form roller is driven primarily by surface contact from the printing plate when in printing position, and driven solely by surface contact with a driven rider roller when in non-printing position. The rider roller is always maintained in contact with the dampener form roller during normal press operation, in both printing and nonprinting positions. An ink form roller of the inking system has three positions: a printing position, a first throw-off position, and a second throw-off or ''''wash-up'''' position wherein it contacts the rider roller of the dampener when the latter is in its non-printing position, whereby cleaning solution applied to the rolls of the inker is also transmitted to the dampener form roller for simultaneously cleaning the inked rollers of both the inker and dampener.
Inventors
- 👤 D Southam
- 👤 J Gaffney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:54
CPC Classifications
B; B41; B41F; B41F35/00; B41F35/002; B41F35/04; B41F7/00; B41F7/20; B41F7/24; B41F7/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
596 words
A lithographic printing press comprising plate cylinder means for carrying a lithographic printing plate during a printing operation, inker means for transmitting ink from a source of ink to the lithographic printing plate during a printing operation, said inker means including an ink distributing roll and ink form roll means for receiving ink from said ink distributing roll and applying ink to the lithographic printing plate, and dampener means for transmitting dampening solution from a source of dampening solution to the lithographic printing plate during a printing operation, said dampener means including dampener form roll means for applying dampening solution to the lithographic printing plate during a printing operation, distributing roll means for transmitting dampening solution along a flow path from the source of dampening solution to said dampener form roll means and for distributing the dampening solution on the surface of said dampener form roll means, and dampener throw-off means for moving said dampener form roll means between a printing position in which said dampener form roll means is disposed in rolling engagement with the lithographic printing plate and a thrown-off position in which said dampener form roll means is spaced from the lithographic printing plate and in which said dampening solution flow path is interrupted to prevent the transfer of solution from the source of dampening solution to said dampener form roll means and to prevent the transfer of solution from said dampener form roll means to the source of dampening solution, said inker means including inker throw-off means for moving said ink form roll means relative to said plate cylinder means from a printing position to a thrown-off position and from a thrown-off position to a wash-up position, said ink form roll means being disposed in rolling engagement with the lithographic printing plate when said ink form roll means is in the printing position, said ink form roll means being spaced apart from both the lithographic printing plate and said roll means in said dampener means when said ink form roll means is in the thrown-off position to prevent the transfer of ink from said ink form roll means to the lithographic printing plate and to said dampener means, said ink form roll means being disposed in rolling engagement with said ink distributing roll and with at least one of said roll means of said dampener means when said ink form roll means is in said wash-up position and said dampener form roll means is in its thrown-off position, said ink form roll means being operable to effect the transmittal of wash-up solution from said ink distributing roll to said dampener form roll means when said ink form roll means iS in its wash-up position, said dampener distributing roll means including a rider roller having a rolling contact engagement with said dampener form roll means when said dampener form roll means is in its printing and thrown-off positions, said rider roller being disposed in rolling contact engagement with said ink form roll means when said ink form roll means is in said wash-up position and said dampener form roll means is in its thrown-off position, and means for driving said rider roller independently of the surfaces of said ink form roll means and said dampener form roll means, said rider roller having a peripheral surface which when said dampener form roll means is in its thrown-off position and when said ink form roll means is located in its thrown-off position provides driving force to the surface of said dampener form roll means independently of other roll means of said inker and dampener means.
Claim 2
Dependent Claim
596 words
A lithographic printing press comprising plate cylinder means for carrying a lithographic printing plate during a printing operation, inker means for transmitting ink from a source of ink to the lithographic printing plate during a printing operation, said inker means including an ink distributing roll and ink form roll means for receiving ink from said ink distributing roll and applying ink to the lithographic printing plate, and dampener means for transmitting dampening solution from a source of dampening solution to the lithographic printing plate during a printing operation, said dampener means including dampener form roll means for applying dampening solution to the lithographic printing plate during a printing operation, distributing roll means for transmitting dampening solution along a flow path from the source of dampening solution to said dampener form roll means and for distributing the dampening solution on the surface of said dampener form roll means, and dampener throw-off means for moving said dampener form roll means between a printing position in which said dampener form roll means is disposed in rolling engagement with the lithographic printing plate and a thrown-off position in which said dampener form roll means is spaced from the lithographic printing plate and in which said dampening solution flow path is interrupted to prevent the transfer of solution from the source of dampening solution to said dampener form roll means and to prevent the transfer of solution from said dampener form roll means to the source of dampening solution, said inker means including inker throw-off means for moving said ink form roll means relative to said plate cylinder means from a printing position to a thrown-off position and from a thrown-off position to a wash-up position, said ink form roll means being disposed in rolling engagement with the lithographic printing plate when said ink form roll means is in the printing position, said ink form roll means being spaced apart from both the lithographic printing plate and said roll means in said dampener means when said ink form roll means is in the thrown-off position to prevent the transfer of ink from said ink form roll means to the lithographic printing plate and to said dampener means, said ink form roll means being disposed in rolling engagement with said ink distributing roll and with at least one of said roll means of said dampener means when said ink form roll means is in said wash-up position and said dampener form roll means is in its thrown-off position, said ink form roll means being operable to effect the transmittal of wash-up solution from said ink distributing roll to said dampener form roll means when said ink form roll means iS in its wash-up position, said dampener distributing roll means including a rider roller having a rolling contact engagement with said dampener form roll means when said dampener form roll means is in its printing and thrown-off positions, said rider roller being disposed in rolling contact engagement with said ink form roll means when said ink form roll means is in said wash-up position and said dampener form roll means is in its thrown-off position, and means for driving said rider roller independently of the surfaces of said ink form roll means and said dampener form roll means, said rider roller having a peripheral surface which when said dampener form roll means is in its thrown-off position and when said ink form roll means is located in its thrown-off position provides driving force to the surface of said dampener form roll means independently of other roll means of said inker and dampener means.
Claim 3
Dependent Claim
78 words
In a lithographic printing press as set forth in claim 1 including a driven gear at one end of said rider roller, a driving gear in driving engagement with said driven gear, said driven gear and said rider roller being supported about the axis of said driving gear to accommodate pivotal movement of said rider roller and driven gear about the axis of the driving gear when said dampener form roll means is moved to its thrown-off position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |