Patent US3636598A successfully refreshed from Google Patents.
US3636598A
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Method for correcting weft distortions in woven webs
Assignee: Mount Hope Machinery Ltd
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Filing: 1969-11-06
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Granted: 1972-01-25
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Expires: 1989-11-06
Abstract
Abstract Bow distortions of the weft threads of woven webs are removed by normally operating a tenter frame at a slightly faster speed than a roll feed drawing the web forwardly from the tenter, thereby intentionally inducing a lagging bow in the web. Bow detection means are connected to momentarily slow the speed of the tenter to less than that of the roll feed when the lagging bow attains an acceptable maximum, allowing the weft threads to return to a straight configuration and eventually toward a leading bow of maximum acceptable magnitude, whereupon the tenter is caused to resume its normal slightly faster speed.
Inventors
- 👤 John H Hannaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:22
CPC Classifications
D; D06; D06H; D06H3/00; D06H3/12; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/024; B32B2262/00; B32B2262/02; B32B2262/0261
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
281 words
The method of correcting bow distortions in the weft threads of a longitudinally travelling woven web by means of a tenter having opposed chains, which comprises the steps of: feeding the web longitudinally by gripping a first region of the web and advancing this region at a predetermined speed which is uniform across the full width of the web; gripping opposed selvage portions of the web by means of the opposed chains of the tenter along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, while feeding the tenter chains and the gripped selvage portions forwardly toward said first region at a speed greater than said predetermined speed, thereby tending to bow the weft threads in said second region in a sense such that the portions of the weft threads near the center of the web will lag behind the portions of the weft threads near the selvages of the web; determining the extent of bowing of the weft threads within said second region; temporarily reducing the feeding rate of the tenter chains and the gripped selvage portions in said second region to a lesser speed than said predetermined speed for a predetermined interval in the event that the weft threads in said second region become bowed to a predetermined extent, resuming the feeding of the tenter chains and the selvage portions in said second region at said greater speed after said predetermined interval; and repetitively alternating the feeding rate of the tenter chains and the gripped selvage portions in said second region between said greater speed and said lesser speed in accordance with the preceding steps.
Claim 2
Independent Claim
281 words
The method of correcting bow distortions in the weft threads of a longitudinally travelling woven web by means of a tenter having opposed chains, which comprises the steps of: feeding the web longitudinally by gripping a first region of the web and advancing this region at a predetermined speed which is uniform across the full width of the web; gripping opposed selvage portions of the web by means of the opposed chains of the tenter along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, while feeding the tenter chains and the gripped selvage portions forwardly toward said first region at a speed greater than said predetermined speed, thereby tending to bow the weft threads in said second region in a sense such that the portions of the weft threads near the center of the web will lag behind the portions of the weft threads near the selvages of the web; determining the extent of bowing of the weft threads within said second region; temporarily reducing the feeding rate of the tenter chains and the gripped selvage portions in said second region to a lesser speed than said predetermined speed for a predetermined interval in the event that the weft threads in said second region become bowed to a predetermined extent, resuming the feeding of the tenter chains and the selvage portions in said second region at said greater speed after said predetermined interval; and repetitively alternating the feeding rate of the tenter chains and the gripped selvage portions in said second region between said greater speed and said lesser speed in accordance with the preceding steps.
Claim 3
Dependent Claim
71 words
The method recited in claim 1, in which the step of temporarily changing the feed rate of the tenter chains and the selvage portions in said second region to a lesser speed than said predetermined speed is repeated with no more than a fixed maximum frequency, and the tenter chains and the selvage portions in said second region are fed at said greater speed between successive ones of said predetermined intervals.
Claim 4
Independent Claim
260 words
The method of correcting bow distortions in the weft threads of a longitudinally travelling woven web by means of a tenter having opposed chains, which comprises the steps of: feeding the web longitudinally by gripping a first region of the web and advancing this region at a predetermined speed which is uniform across the full width of the web; gripping opposed selvage portions of the web by means of the opposed chains of the tenter along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, while feeding the tenter chains and the gripped selvage portions forwardly toward said first region at a first speed different from said predetermined speed, thereby tending to bow the weft threads in said second region; determining the extent of bowing of the weft threads within said second region; temporarily changing the feed rate of the tenter chains and the gripped selvage portions in said second region for a predetermined interval to a second speed differing from said predetermined speed in an opposite algebraic sense from said first speed, in the event that the weft threads in said second region become bowed to a predetermined extent, resuming the feeding of the tenter chains and the selvage portions in said second region at said first speed after said predetermined interval; and repetitively alternating the feeding rate of the tenter chains and the gripped selvage portions in said second region between said first speed and said second speed in accordance with the preceding steps.
Claim 5
Independent Claim
260 words
The method of correcting bow distortions in the weft threads of a longitudinally travelling woven web by means of a tenter having opposed chains, which comprises the steps of: feeding the web longitudinally by gripping a first region of the web and advancing this region at a predetermined speed which is uniform across the full width of the web; gripping opposed selvage portions of the web by means of the opposed chains of the tenter along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, while feeding the tenter chains and the gripped selvage portions forwardly toward said first region at a first speed different from said predetermined speed, thereby tending to bow the weft threads in said second region; determining the extent of bowing of the weft threads within said second region; temporarily changing the feed rate of the tenter chains and the gripped selvage portions in said second region for a predetermined interval to a second speed differing from said predetermined speed in an opposite algebraic sense from said first speed, in the event that the weft threads in said second region become bowed to a predetermined extent, resuming the feeding of the tenter chains and the selvage portions in said second region at said first speed after said predetermined interval; and repetitively alternating the feeding rate of the tenter chains and the gripped selvage portions in said second region between said first speed and said second speed in accordance with the preceding steps.
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |