Patent US857073A successfully refreshed from Google Patents.
US3688694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dampening device for a printing press
Assignee: Roland Offsetmaschinenfabrik Faber and Schleicher AG
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Filing: 1970-07-29
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Granted: 1972-09-05
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Expires: 1990-07-29
Abstract
Abstract A dampening device applies moisture to the plate cylinder of a printing press by means of a dampening roll in engagement with the cylinder. Dampening fluid is supplied to the dampening roll via a transfer chain including a transfer roll in engagement with the dampening roll and driven with the same circumferential speed as the plate cylinder, a moisture-transmitting intermediate roll in engagement with the transfer roll and a fountain roll in engagement with the intermediate roll and taking up dampening fluid from a fountain basin. The intermediate roll is positively driven with a circumferential speed different from that of the fountain roll which may be driven by the power drive of the press or an independent drive. Such speed differential between the two rolls reduces the extent of the slippage between the same and permits an accurate control of the slippage thereby improving the uniformity of the flow of dampening fluid to the dampening roll.
Inventors
- 👤 Friedrich Preuss
- 👤 Hans Alix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:45
CPC Classifications
B; B41; B41F; B41F7/00; B41F7/20; B41F7/24; B41F7/26; B41F7/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
142 words
A dampening device for a printing press including a plate cylinder driven by the power drive of the press, said device comprising in combination: a dampening roll in rolling engagement with the plate cylinder for dampening the circumferential wall thereof; a transfer roll in engagement with the dampening roll for transferring dampening fluid to said roll; first drive means for driving the transfer roll with a circumferential speed equal to the circumferential speed of the plate cylinder; a dampening fluid supplying fountain roll rotated at a selected circumferential speed; a fluid transmitting intermediate roll interposed between the fountain roll and the transfer roll engageable with said rolls for transferring dampening fluid from the fountain roll to the transfer roll; and second drive means for positively driving said intermediate roll with a circumferential speed different from the circumferential speed of the fountain roll.
Claim 2
Dependent Claim
142 words
A dampening device for a printing press including a plate cylinder driven by the power drive of the press, said device comprising in combination: a dampening roll in rolling engagement with the plate cylinder for dampening the circumferential wall thereof; a transfer roll in engagement with the dampening roll for transferring dampening fluid to said roll; first drive means for driving the transfer roll with a circumferential speed equal to the circumferential speed of the plate cylinder; a dampening fluid supplying fountain roll rotated at a selected circumferential speed; a fluid transmitting intermediate roll interposed between the fountain roll and the transfer roll engageable with said rolls for transferring dampening fluid from the fountain roll to the transfer roll; and second drive means for positively driving said intermediate roll with a circumferential speed different from the circumferential speed of the fountain roll.
Claim 3
Dependent Claim
22 words
The dampening device according to claim 1 wherein a gearing means is interposed between said intermediate roll and the drive means therefor.
Claim 4
Dependent Claim
16 words
The dampening device according to claim 2 wherein said gearing means has a variable transmission ratio.
Claim 5
Dependent Claim
25 words
The dampening device according to claim 1 and comprising a drive means for driving the fountain roll independent of the power drive of the press.
Claim 6
Dependent Claim
35 words
The dampening device of claim 1 and comprisinG setting means for selectively throwing the intermediate roll into and out of engagement with the transfer roll and also for varying the engagement pressure between said rolls.
Claim 7
Dependent Claim
36 words
The dampening device according to claim 1 and comprising setting means for selectively throwing the fountain roll into and out of engagement with the intermediate roll and also for varying the engagement pressure between said rolls.
Claim 8
Dependent Claim
35 words
The dampening device according to claim 6 wherein said setting means include means for placing the rotational axis of the fountain roll at an angle with reference to the rotational axis of the intermediate roll.
Claim 9
Dependent Claim
48 words
The dampening device according to claim 1 and comprising a squeezing roll coacting with the circumferential wall of the fountain roll, and setting means for throwing said squeezing roll into and out of engagement with the fountain roll and also for varying the engagement pressure between said rolls.
Claim 10
Dependent Claim
23 words
The dampening device according to claim 1 and comprising a doctor blade coacting with the fountain roll for wiping the circumferential wall thereof.
Claim 11
Dependent Claim
38 words
The dampening device according to claim 1 wherein transmission means positively couple said first drive means to the dampening roll for positively driving the latter with a circumferential speed equal to the circumferential speed of the plate cylinder.
Claim 12
Dependent Claim
25 words
The dampening device according to claim 1 wherein a distributing roll is in rotation transmitting frictional engagement with the circumferential wall of the dampening roll.
Claim 13
Dependent Claim
29 words
The dampening device according to claim 1 wherein transmission means positively couple the intermediate roll with the transfer roll for positively driving said rolls at the same circumferential speed.
Claim 14
Dependent Claim
23 words
The dampening device according to claim 12 wherein said transmission means comprise a gearing coupled to the intermediate roll and the transfer roll.
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |