US3561654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for maintaining constant the tension of a web pulled through printing units of a printing press
Assignee: Roland Offsetmaschinenfabrik Faber and Schleicher AG
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Filing: 1969-05-13
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Granted: 1971-02-09
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Expires: 1989-05-13
Abstract
Abstract A device for maintaining constant the tension of a paper web withdrawn from a supply roll and conveyed through one or more printing units of a printing press by two couples of power-driven rollers disposed anterior and posterior, respectively, of the unit or units includes measuring means for measuring and visually preferably digitally indicating speed differentials between the two couples and speed regulating means for setting the relative speed of the couples for a selected value. These regulating means are complemented and act in conjunction with control means which automatically maintain the tension of the web portion between the anterior couple and the next adjacent printing unit at a selected constant value.
Inventors
- 👤 Harry Greiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:54
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/18; B65H23/188; B65H23/1888; B41; B41F; B41F33/00; B41F33/02; B65H2301/00; B65H2301/30; B65H2301/31; B65H2301/311; B65H2301/3112; B65H2801/00; B65H2801/03; B65H2801/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
A device for maintaining constant the tension of a web conveyed from a web supply through at least one printing unit of a printing press, said device comprising in combination: a first couple of power-driven conveyor rollers for conveying said web disposed anterior of the printing unit; a second couple of power-driven conveyor rollers for conveying said web disposed posterior of the printing unit; transmission means with variable transmission ratio coupled to each of said couples for varying the rotational speed of the rollers of the respective couple; speed measuring and indicating mean connected to each of the couples, said means measuring and visually indicating speed differentials between said two couples for adjusting the speed differential to a selected value by varying the transmission ratio of at least one of said transmission means; and automatic speed control means including detecting means detecting the tension of the web portion between the first couple and said printing unit, said control means being controlled by said detecting means and controlling the transmission ratio of the transmission means coupled to said first couple for correspondingly varying the rotational speed of the rollers thereof so as to maintain said web portion at a selected constant tension.
Claim 2
Independent Claim
201 words
A device for maintaining constant the tension of a web conveyed from a web supply through at least one printing unit of a printing press, said device comprising in combination: a first couple of power-driven conveyor rollers for conveying said web disposed anterior of the printing unit; a second couple of power-driven conveyor rollers for conveying said web disposed posterior of the printing unit; transmission means with variable transmission ratio coupled to each of said couples for varying the rotational speed of the rollers of the respective couple; speed measuring and indicating mean connected to each of the couples, said means measuring and visually indicating speed differentials between said two couples for adjusting the speed differential to a selected value by varying the transmission ratio of at least one of said transmission means; and automatic speed control means including detecting means detecting the tension of the web portion between the first couple and said printing unit, said control means being controlled by said detecting means and controlling the transmission ratio of the transmission means coupled to said first couple for correspondingly varying the rotational speed of the rollers thereof so as to maintain said web portion at a selected constant tension.
Claim 3
Dependent Claim
21 words
The device according to claim 1 wherein each of said transmission means comprises a gear train with finely variable gear ratio.
Claim 4
Dependent Claim
24 words
The device according to claim 1 wherein each of said measuring and indicating means comprises a digital indicating means numerically indicating said speed differentials.
Claim 5
Dependent Claim
89 words
The device according to claim 1 wherein said automatic speed control means comprises a floating roll suspended in a loop of said web portion for up and down movement of the roll in accordance with the tension of said web portion, and electric control means controlling the transmission ratio of the transmission means coupled to the first couple, said electric control means including a potentiometer having a contact slider the position of said slider varying in accordance with variations in the up and down movements of said floating roll.
Claim 6
Dependent Claim
49 words
The device according to claim 1 and comprising remote control means connected to the transmission means coupled to the second couple for controlling the transmission ratio of said transmission means, said remote control means being located adjacent to said measuring and indicating means thereby providing a common control station.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |