US3878872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warp let-off means
Assignee: Sulzer AG
•
Filing: 1973-09-27
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Granted: 1975-04-22
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Expires: 1993-09-27
Abstract
Abstract The speed of the warp feed roller is controlled in dependence on the warp tension in the weaving machine via a control motor. The speed of the motor is regulated by signals obtained from a pressure sensor on the breast beam which sensor measures the pressure of the produced cloth on the breast beam. The control signals can also be obtained from a measurement of the rate of cloth draw-off. Alternatively, a torque pick-off can be used to measure cloth tension in order to produce the control signal for the control motor.
Inventors
- 👤 Otto Hintsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:05
CPC Classifications
D; D03; D03D; D03D49/00; D03D49/04; D03D49/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
103 words
In a weaving machine having a feed roller for feeding warp yarns into a shed and a breast beam downstream of said shed for passage of a produced cloth thereover; a warp let off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a pressure sensor disposed on said breast beam for producing a control signal corresponding to warp tension in response to the pressure of the cloth on said breast beam for emission to said control element.
Claim 2
Dependent Claim
103 words
In a weaving machine having a feed roller for feeding warp yarns into a shed and a breast beam downstream of said shed for passage of a produced cloth thereover; a warp let off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a pressure sensor disposed on said breast beam for producing a control signal corresponding to warp tension in response to the pressure of the cloth on said breast beam for emission to said control element.
Claim 3
Dependent Claim
103 words
In a weaving machine having a feed roller for feeding warp yarns into a shed and a breast beam downstream of said shed for passage of a produced cloth thereover; a warp let off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a pressure sensor disposed on said breast beam for producing a control signal corresponding to warp tension in response to the pressure of the cloth on said breast beam for emission to said control element.
Claim 4
Dependent Claim
103 words
In a weaving machine having a feed roller for feeding warp yarns into a shed and a breast beam downstream of said shed for passage of a produced cloth thereover; a warp let off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a pressure sensor disposed on said breast beam for producing a control signal corresponding to warp tension in response to the pressure of the cloth on said breast beam for emission to said control element.
Claim 5
Dependent Claim
22 words
A weaving machine as set forth in claim 1 wherein said pressure sensor is a strain gauge secured to said breast beam.
Claim 6
Dependent Claim
40 words
A weaving machine as set forth in claim 1 further having a cloth take-off roller wherein said control circuit includes means for determining the speed of said draw-off roller as a measure of warp tension for controlling said control element.
Claim 7
Dependent Claim
17 words
A weaving machine as set forth in claim 1 wherein said control element is a stepping motor.
Claim 8
Dependent Claim
19 words
A weaving machine as set forth in claim 1 wherein said control element is a steplessly variable three-phase motor.
Claim 9
Dependent Claim
92 words
In a weaving machine having a feed roller for feeding warp yarns into a shed, a breast beam downstream of said shed for passage of a produced cloth thereover and a cloth draw-off roller; a warp let-off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a torque pick-off coupled to said draw-off roller to emit a control signal corresponding to warp tension to said control element.
Claim 10
Dependent Claim
92 words
In a weaving machine having a feed roller for feeding warp yarns into a shed, a breast beam downstream of said shed for passage of a produced cloth thereover and a cloth draw-off roller; a warp let-off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a torque pick-off coupled to said draw-off roller to emit a control signal corresponding to warp tension to said control element.
Claim 11
Dependent Claim
103 words
Warp let-off apparatus for a weaving machine comprising a feed roller for feeding warp yarn from a warp beam into a shed; driving means for driving said feed roller; an electric control circuit controlling the speed of said driving means in dependence upon warp tension; a breast beam for passage of produced cloth thereover; a cloth draw-off roller for receiving a produced cloth thereon; and a pressure transducer disposed on said breast beam to cause said control circuit to produce a control signal corresponding to warp tension in response to pressure of the cloth on said breast beam for controlling said drive means.
Claim 12
Dependent Claim
103 words
Warp let-off apparatus for a weaving machine comprising a feed roller for feeding warp yarn from a warp beam into a shed; driving means for driving said feed roller; an electric control circuit controlling the speed of said driving means in dependence upon warp tension; a breast beam for passage of produced cloth thereover; a cloth draw-off roller for receiving a produced cloth thereon; and a pressure transducer disposed on said breast beam to cause said control circuit to produce a control signal corresponding to warp tension in response to pressure of the cloth on said breast beam for controlling said drive means.
Claim 13
Dependent Claim
22 words
Warp let-off apparatus as set forth in claim 7 wherein said pressure transducer is a strain gauge secured to said breast beam.
Claim 14
Dependent Claim
82 words
Warp let-off apparatus for a weaving machine comprising a feed roller for feeding warp yarn from a warp beam into a shed; driving means for driving said feed roller; an electric control circuit controlling the speed of said driving means in dependence upon warp tension; a cloth draw-off roller for receiving produced cloth thereon; and a torque pick-off coupled to said draw-off roller to cause said control circuit to produce a control signal corresponding to warp tension for controlling said drive means.
Claim 15
Dependent Claim
82 words
Warp let-off apparatus for a weaving machine comprising a feed roller for feeding warp yarn from a warp beam into a shed; driving means for driving said feed roller; an electric control circuit controlling the speed of said driving means in dependence upon warp tension; a cloth draw-off roller for receiving produced cloth thereon; and a torque pick-off coupled to said draw-off roller to cause said control circuit to produce a control signal corresponding to warp tension for controlling said drive means.
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |