Patent US3913900A successfully refreshed from Google Patents.
US3913900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for regulating the tension in a running web
Assignee: Wifag Maschinenfabrik AG
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Filing: 1973-12-06
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Granted: 1975-10-21
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Expires: 1993-12-06
Abstract
Abstract To regulate the tension in a running web, such as a paper web entering a rotary roll printing press, the web is introduced between a take-off roller and a pressure roller and, after its passage over the take-off roller, it moves over a pendulum roller for subsequent passage to the printing press. A tachometergenerator is connected to the motor driving the take-off roller and another tachometer-generator is connected to the drive motor for the introduction of the paper web and the values obtained from these tachometer-generator are compared in a mixing point and the take-off roller motor is regulated over a comparisonspeed regulator through a reversing switch and a line connected to the take-off roller motor. If the speed of travel of the web is increased, regulation of the take-off roller motor is achieved over a comparison-position regulator connected through a mixing point to two potentiometers, one connected to the pendulum roller and another providing a nominal value, the comparison-position regulator is also connected to the take-off roller motor through the reversing switch and the line.
Inventors
- 👤 Hansruedi Muster
- 👤 Jean Rohrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:58
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/18; B65H23/188; B65H23/1888; B65H2301/00; B65H2301/30; B65H2301/31; B65H2301/311; B65H2301/3112
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
303 words
Device for regulating the tension of a running web, such as a paper web entering a rotary roll printing press, including a take-off roller, a pressure roller associated with said take-off roller, and a pendulum roller located downstream of said take-off roller in the path of travel of the web, so that the web passes between said take-off roller and said pressure roller and over said take-off roller before it passes over said pendulum roller and onto the printing press, wherein the improvement comprises a motor for said take-off roller, a first tachometer-generator associated with said take-off roller motor for providing a first value, a second tachometer-generator associated with the main motor for pulling the web for providing a second value, a first mixing point in communication with said first tachometergenerator and said second tachometer-generator for comparing the first and second values obtained therefrom, a comparison-speed regulator in communication with said first mixing point, a line connected at one end to said take-off roller motor, a reversing switch connected to the other end of said line and selectively connectable to said comparison-speed regulator, a nominal value limiter, an amplifier, an impulse stage and a power unit arranged in series in said line between said reversing switch and said take-off roller motor so that the regulation of said take-off roller motor can be effected over said comparison-speed regulator and said line, a first potentiometer in operative communication with said pendulum, a second potentiometer for a nominal value, a second mixing point connected to said first and second potentiometers, a nominal-actual value comparison position regulator connected to said second mixing point and selectively connectable through said reversing switch to said line so that said reversing switch can be positioned for connecting said takeoff roller motor to one of said comparison-speed regulator and said comparison-position regulator.
Claim 2
Dependent Claim
303 words
Device for regulating the tension of a running web, such as a paper web entering a rotary roll printing press, including a take-off roller, a pressure roller associated with said take-off roller, and a pendulum roller located downstream of said take-off roller in the path of travel of the web, so that the web passes between said take-off roller and said pressure roller and over said take-off roller before it passes over said pendulum roller and onto the printing press, wherein the improvement comprises a motor for said take-off roller, a first tachometer-generator associated with said take-off roller motor for providing a first value, a second tachometer-generator associated with the main motor for pulling the web for providing a second value, a first mixing point in communication with said first tachometergenerator and said second tachometer-generator for comparing the first and second values obtained therefrom, a comparison-speed regulator in communication with said first mixing point, a line connected at one end to said take-off roller motor, a reversing switch connected to the other end of said line and selectively connectable to said comparison-speed regulator, a nominal value limiter, an amplifier, an impulse stage and a power unit arranged in series in said line between said reversing switch and said take-off roller motor so that the regulation of said take-off roller motor can be effected over said comparison-speed regulator and said line, a first potentiometer in operative communication with said pendulum, a second potentiometer for a nominal value, a second mixing point connected to said first and second potentiometers, a nominal-actual value comparison position regulator connected to said second mixing point and selectively connectable through said reversing switch to said line so that said reversing switch can be positioned for connecting said takeoff roller motor to one of said comparison-speed regulator and said comparison-position regulator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |