US4143596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic press dampening system
Assignee: Individual
•
Filing: 1977-05-04
•
Granted: 1979-03-13
•
Expires: 1997-05-04
Abstract
Abstract A dampening system for a lithographic press, comprised of a brush roller contacting a fountain roller immersed in a fluid. The brush roller is contacted by an elongate flicker bar transferring the fluid to a vibrator roller for application to a plate cylinder by a form roller. Drive means operate the fountain roller which is geared to the brush roller. The ratio of the gearing is such that the brush roller is driven at an overspeed condition relative to the fountain roller.
Inventors
- 👤 Robert W. Ivett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:57
CPC Classifications
B; B41; B41F; B41F7/00; B41F7/20; B41F7/24; B41F7/30; B41F7/26; B41F7/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
In a lithographic press dampening system in which a fluid is transferred to a plate roller through a series of rollers, the improvement comprising: a fountain containing a dampening fluid; a fountain roller partially immersed in said fluid for picking up and transferring said fluid; a brush roller having bristles in a continuous contact with said fountain roller for transferring said fluid; an elongate flicker bar adjacent to said brush roller engaging and bending said bristles for deflecting the fluid from said brush roller to said series of rollers; first means for rotatably driving said fountain roller; and second means for driving said brush roller counter to and at an overspeed with respect to said fountain roller whereby the bristles of said brush have a slight wiping action against the fountain roller picking up a uniform volume of dampening fluid; whereby said fluid is transferred to said plate cylinder from said series of rollers.
Claim 2
Dependent Claim
154 words
In a lithographic press dampening system in which a fluid is transferred to a plate roller through a series of rollers, the improvement comprising: a fountain containing a dampening fluid; a fountain roller partially immersed in said fluid for picking up and transferring said fluid; a brush roller having bristles in a continuous contact with said fountain roller for transferring said fluid; an elongate flicker bar adjacent to said brush roller engaging and bending said bristles for deflecting the fluid from said brush roller to said series of rollers; first means for rotatably driving said fountain roller; and second means for driving said brush roller counter to and at an overspeed with respect to said fountain roller whereby the bristles of said brush have a slight wiping action against the fountain roller picking up a uniform volume of dampening fluid; whereby said fluid is transferred to said plate cylinder from said series of rollers.
Claim 3
Dependent Claim
30 words
The dampening system according to claim 1 including a collecting trough beneath the flicker bar and brush roller for collecting and disposing of excess fluid dislodged from said brush roller.
Claim 4
Dependent Claim
22 words
The dampening system according to claim 2 wherein said flicker bar comprises an elongate edge of said trough beneath said brush roller.
Claim 5
Dependent Claim
25 words
The dampening system according to claim 1 including: linking means linking the second means to the first means to maintain the overspeed condition substantially constant.
Claim 6
Dependent Claim
69 words
The dampening system according to claim 4 wherein said linking means comprises: a shaft for driving the fountain roller; a gear on said fountain roller shaft; a second shaft for driving said brush roller; a second gear on said brush roller shaft engaging said first gear; and said first and second gears having a ratio whereby said brush roller is driven at an overspeed relative to the fountain roller.
Claim 7
Dependent Claim
27 words
The dampening system according to claim 5 wherein said gear ratio may be selected to provide an overspeed condition between slightly more that 3% up to 10%.
Claim 8
Dependent Claim
21 words
The dampening system according to claim 5 wherein the gear ratio is selected to provide an overspeed condition of approximately 5%.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |