US3608797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensing means for controlling felt guides
Assignee: Hindle Son and Co Ltd
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Filing: 1968-11-29
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Granted: 1971-09-28
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Expires: 1988-11-29
Abstract
Abstract Sensing means comprising two nozzle outlets from which jets of fluid medium can issue, supported in relation to a web travelling over a pivotally supported guide roll which is adapted to be slewed relative to one end to correct wandering of the web by a motor and linkage connecting the motor to one end of the guide roll, said nozzle outlets being positionable in relation to the web so that when the web is moving along its normal course one or both nozzle outlets may or may not be interrupted by the web, and a detector on which the jets from the nozzle outlets fall when not interrupted by the web, said detector being operable to effect operation of the motor in a direction to effect compensating slewing of the guide roll.
Inventors
- 👤 Thomas Hindle
- 👤 David Dugmore Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:12
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/36; D21F1/365
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
Sensing means for sensing the wanderings of a travelling web which passes over a guide roll equipped with means operable in response to signals for slewing such guide roll to correct the web wanderings, said sensing means comprising two nozzle outlet means from which jets of a fluid medium can issue, said outlet means being positionable in relation to the travelling web so that when the web is running in its normal course one or both of the jets may or may not be interrupted by the web, detector means onto which the jets fall when not interrupted by the web for supplying signals to the meaNs for slewing the guide roll to effect its operation, and jet timer means for insuring that the jets of fluid issue from the nozzle outlets intermittently during the operation of the sensing means.
Claim 2
Dependent Claim
140 words
Sensing means for sensing the wanderings of a travelling web which passes over a guide roll equipped with means operable in response to signals for slewing such guide roll to correct the web wanderings, said sensing means comprising two nozzle outlet means from which jets of a fluid medium can issue, said outlet means being positionable in relation to the travelling web so that when the web is running in its normal course one or both of the jets may or may not be interrupted by the web, detector means onto which the jets fall when not interrupted by the web for supplying signals to the meaNs for slewing the guide roll to effect its operation, and jet timer means for insuring that the jets of fluid issue from the nozzle outlets intermittently during the operation of the sensing means.
Claim 3
Dependent Claim
35 words
Sensing means according to claim 1, wherein the detector means comprises two lever arms which are deflectable by the jets from the nozzle outlet and switch means actuatable by such deflection of the lever arms.
Claim 4
Dependent Claim
21 words
Sensing means according to claim 1, wherein said detector means comprises two pitot tubes and two pressure-sensitive switches operatively connected thereto.
Claim 5
Dependent Claim
92 words
Sensing means according to claim 1, wherein the jet timing means includes a pneumatic cylinder with a reciprocable piston which carries a switch actuating member, reversing switches which are actuated by said switch actuating member during reciprocation to cause reciprocation of a pilot valve which controls the flow of pressure air to the cylinder, and a jet valve which is opened by said valve actuating member for a part of the period of the reciprocation of the piston, said jet valve being in the pressure fluid supply line to the nozzle outlets.
Claim 6
Dependent Claim
38 words
Sensing means according to claim 4, wherein the jet timer means includes isolating means such that the pressure fluid issues continuously from the jet nozzle outlet when a web wandering has been detected and until it is corrected.
Claim 7
Dependent Claim
29 words
Sensing means according to claim 4, wherein the reversing switches operate pneumatic valves to cause pressure air to be applied in turn to the ends of the pilot valve.
Claim 8
Dependent Claim
21 words
Sensing means according to claim 4, wherein the reversing switches operate solenoids connected to the respective ends of the pilot valve.
Claim 9
Dependent Claim
63 words
Sensing means according to claim 5, wherein said isolating means includes a check member which is operated as a result of the sensing of a wandering of the web and when so operated prevents any displacing force from being applied to the end of the pilot valve so that the piston is stalled in a position in which the jet valve remains opened.
Claim 10
Dependent Claim
32 words
Guiding means according to claim 1, wherein the slewing means comprises a slave cylinder which is double acting so that the roll can be slewed to either side of a mean position.
Claim 11
Dependent Claim
21 words
Guiding means according to claim 9, including a control valve which controls the supply of pressure fluid to the slave cylinder.
Claim 12
Dependent Claim
27 words
Guiding means according to claim 10, wherein the sensing means is coupled to the control valve to control the positioning of same by pneumatic or electromechanical means.
Claim 13
Dependent Claim
42 words
Guide means according to claim 1, including centralizing means acting on said guide roll so that when the supply of pressure fluid to the slewing cylinder is cut off the guide roll is returned to the mean position by said centralizing means.
Claim 14
Dependent Claim
94 words
Guide means according to claim 12, wherein there is means pivotally supporting one end of the guide roll and means suspending the other end of the guide roll for movement forwardly and rearwardly in the plane of the course of the web, said latter means comprising a link pivotally supported at its upper end and containing intermediate its ends a journal in which said other end of the roll is supported, and wherein the slewing means and centralizing means are connected to said link, respectively, below and above the axis of the guide roll.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |