US3706328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the continuous and automatically controlled driving of warp beams and similar devices bearing a yarn supply
Assignee: Elitex Zavody Textilniho
•
Filing: 1970-08-19
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Granted: 1972-12-19
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Expires: 1990-08-19
Abstract
Abstract Device for continuously and automatically controlling the drive of warp beams and like. A hydraulic motor is provided for driving the warp beam, the motor being under the control of a valve which is operated by a tension sensitive device which detects the tension in the threads being paid off the beam.
Inventors
- 👤 Pravomil Dostal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:31
CPC Classifications
D; D03; D03D; D03D49/00; D03D49/04; D03D49/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
In a loom having a warp beam provided with a yarn supply, a shedding mechanism the operation of which causes a momentary variation in the length of the warp in the loom, and a cloth take-up means, a device for the continuous and automatically controlled drive of the warp beam comprising a hydraulic motor for driving the warp beam, a source of hydraulic fluid under pressure, a control valve for the motor in circuit with the fluid pressure source and the motor, said control valve having a movable valve element, a tension sensitive feeler movable in response to changes in the tension of the warp yarns delivered from the warp beam for controlling the valve, and means connecting the tension sensitive feeler to the movable valve element, said last named means including lost motion means, whereby minor changes in the tension of the warp yarns delivered from the warp beam caused by the shedding operation do not cause movement of the valve element.
Claim 2
Dependent Claim
163 words
In a loom having a warp beam provided with a yarn supply, a shedding mechanism the operation of which causes a momentary variation in the length of the warp in the loom, and a cloth take-up means, a device for the continuous and automatically controlled drive of the warp beam comprising a hydraulic motor for driving the warp beam, a source of hydraulic fluid under pressure, a control valve for the motor in circuit with the fluid pressure source and the motor, said control valve having a movable valve element, a tension sensitive feeler movable in response to changes in the tension of the warp yarns delivered from the warp beam for controlling the valve, and means connecting the tension sensitive feeler to the movable valve element, said last named means including lost motion means, whereby minor changes in the tension of the warp yarns delivered from the warp beam caused by the shedding operation do not cause movement of the valve element.
Claim 3
Dependent Claim
68 words
A device as claimed in claim 1, wherein the feeler for checking the tension of warp yarns has a two-arm lever, one arm of which cooperates with the movable element of the control valve, warp yarns being guided about guide means on the other arm of the lever, and comprising adjustable means for subjecting the lever to a yielding torque whereby to subject the warp yarns to tension.
Claim 4
Dependent Claim
35 words
A device according to claim 1, wherein the valve is a throttle valve having a movable valve element which passes fluid at a progressively higher rate as the valve element is moved in one direction.
Claim 5
Dependent Claim
17 words
A device according to claim 3, wherein the valve element remains stably in a given adjusted position.
Claim 6
Dependent Claim
97 words
A device as claimed in claim 4, wherein the control valve is provided with a control element in the form of a reciprocable piston, the piston has an annular groove therein, the valve body has an annular groove therein, the circumference of the piston having longitudinal grooves therein between the annular groove in the piston and the annular groove in the inner circumference of the body of the control valve, the cross-section of said longitudinal grooves diminishing in the direction from the annular groove in the piston toward the annular groove in the body of the valve.
Claim 7
Dependent Claim
53 words
A device as claimed in claim 5 comprising a port in the valve body communicating with the annular groove in the piston in all operative positions of the piston, the maximum length of said longitudinal grooves not exceeding the distance between said port and the annular groove in the body of the valve.
Claim 8
Dependent Claim
21 words
A device according to claim 4, comprising means for adjusting the length of the lost motion in the lost motion device.
References Cited (Backward Citations)
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US1579600A
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US2358611A
Cited
US2565386A
Cited
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Cited
US3221518A
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US3261375A
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |