Patent US3751774A successfully refreshed from Google Patents.
US3751774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for correcting weft distortions in woven webs
Assignee: Mount Hope Machinery Ltd
•
Filing: 1971-10-12
•
Granted: 1973-08-14
•
Expires: 1991-10-12
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
- 👤 J Hannaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:43
CPC Classifications
D; D06; D06H; D06H3/00; D06H3/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
314 words
Apparatus for correcting weft distortions in the weft threads of a longitudinally-travelling woven web, comprising: web-feeding means engaging the web in a first region thereof, constructed and arranged for feeding the web at a predetermined speed which is uniform across the full width of the web; a tenter having opposed chains arranged to grip opposite selvages of the web along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, adjustable-speed drive means for said tenter constructed and arranged normally to drive said chains at a speed greater than said predetermined speed, thereby feeding the gripped selvages forwardly toward said first region at a speed greater than said predetermined speed and 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 consistently tend to lag behind the portions of the weft threads near the selvages of the web; means for detecting the degree of bowing of the weft threads at points within said second region and for producing a control signal in the event that the weft threads acquire a lagging bow of a predetermined extent, said detecting means being operatively connected to control the speed of said drive means; said detecting means being constructed and arranged to temporarily reduce the speed of said drive means for a predetermined interval to drive said chains and the gripped selvages at a lesser speed than said predetermined speed in response to a control signal generated by said detecting means, to restore the speed of said drive means to said greater speed after said predetermined interval, and to repetitively alternate the speed of said drive means between said greater speed and said lesser speed as successive control signals are produced and successive predetermined intervals expire thereafter.
Claim 2
Dependent Claim
314 words
Apparatus for correcting weft distortions in the weft threads of a longitudinally-travelling woven web, comprising: web-feeding means engaging the web in a first region thereof, constructed and arranged for feeding the web at a predetermined speed which is uniform across the full width of the web; a tenter having opposed chains arranged to grip opposite selvages of the web along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, adjustable-speed drive means for said tenter constructed and arranged normally to drive said chains at a speed greater than said predetermined speed, thereby feeding the gripped selvages forwardly toward said first region at a speed greater than said predetermined speed and 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 consistently tend to lag behind the portions of the weft threads near the selvages of the web; means for detecting the degree of bowing of the weft threads at points within said second region and for producing a control signal in the event that the weft threads acquire a lagging bow of a predetermined extent, said detecting means being operatively connected to control the speed of said drive means; said detecting means being constructed and arranged to temporarily reduce the speed of said drive means for a predetermined interval to drive said chains and the gripped selvages at a lesser speed than said predetermined speed in response to a control signal generated by said detecting means, to restore the speed of said drive means to said greater speed after said predetermined interval, and to repetitively alternate the speed of said drive means between said greater speed and said lesser speed as successive control signals are produced and successive predetermined intervals expire thereafter.
Claim 3
Dependent Claim
26 words
Apparatus as recited in claim 1, in which said detecting means includes timing means for discontinuing said control signal after said predetermined interval from its inception.
Claim 4
Dependent Claim
62 words
Apparatus as recited in claim 1, in which said detecting means includes timing means for discontinuing said control signal after said predetermined interval from its inception, and for blocking the inception of a renewed control signal for a further interval thereafter, whereby control signals are generated only for said predetermineD interval and are repeated with no more than a predetermined maximum frequency.
Claim 5
Dependent Claim
39 words
Apparatus as recited in claim 1, in which said web-feeding means comprise cylindrical roll means partially wrapped by said first region of the web for advancing said web at a rate which is uniform for every longitudinal element thereof.
Claim 6
Dependent Claim
82 words
Apparatus as recited in claim 1, in which said adjustable-speed drive means are constructed and arranged for driving said chains at independently-adjustable speeds for correcting skew distortions in the weft threads of the web; said detecting means being constructed and arranged to produce further control signals in the event that the weft threads become skewed and being operably connected to adjust the speed of said chains differentially in a sense to straighten the weft threads in response to said further control signals.
Claim 7
Dependent Claim
68 words
Apparatus as recited in claim 1, in which said adjustable-speed drive means include alternative drive trains including: a first normally-operative train of a higher speed ratio corresponding to said greater speed and disconnectable by said control signal; and a second normally-inoperative train of a lower speed ratio constructed and arranged for operation to drive said chains at less than said predetermined speed upon disconnection of said first train.
Claim 8
Dependent Claim
22 words
Apparatus as recited in claim 6, in which said first train includes normally-engaged clutch means connected for disengagement by said control signal.
Claim 9
Dependent Claim
28 words
Apparatus as recited in claim 6, in which said second train includes over-running clutch means constructed and arranged to drive said chains upon disconnection of said first train.
Claim 10
Dependent Claim
63 words
Apparatus as recited in claim 6, in which said first train includes motive means operable by said detecting means in the absence of said control signal and rendered inoperative in response to said control signal, and said second train includes motive means operable by said detecting means in response to said control signal and rendered inoperative in the absence of said control signal.
Claim 11
Dependent Claim
42 words
Apparatus as recited in claim 1, in which said adjustable-speed drive means include manually-controllable means for adjusting said greater speed to control the tendency of said tenter to bow the weft threads in said second region when driven at said greater speed.
Claim 12
Dependent Claim
288 words
Apparatus for correcting weft distortions in the weft threads of a longitudinally-travelling woven web, comprising: web-feeding means engaging the web in a first region thereof, constructed and arranged for feeding the web at a predetermined speed which is uniform across the full width of the web; a tenter having opposed chains arranged to grip opposite selvages of the web along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, adjustable-speed drive means for said tenter constructed and arranged normally to drive said chains at a first speed different from said predetermined speed, thereby feeding the gripped selvages forwardly toward said first region at a speed different from said predetermined speed and thereby tending to bow the weft threads in said second region; means for detecting the degree of bowing of the weft threads at points within said second region and for producing a control signal in the event that the weft threads acquire a bow of a predetermined extent, said detecting means being operatively connected to control the speed of said drive means; said detecting means being constructed and arrange to temporarily change the speed of said drive means for a predetermined interval to drive said chains and the gripped selvages at a second speed differing from said predetermined speed in an opposite algebraic sense from the first speed, in response to a control signal generated by said detecting means, to restore the speed of said drive means to said first speed after said predetermined interval, and to repetitively alternate the speed of said drive means between said first and sEcond speeds as successive control signals are produced and successive predetermined intervals expire thereafter.
Claim 13
Dependent Claim
288 words
Apparatus for correcting weft distortions in the weft threads of a longitudinally-travelling woven web, comprising: web-feeding means engaging the web in a first region thereof, constructed and arranged for feeding the web at a predetermined speed which is uniform across the full width of the web; a tenter having opposed chains arranged to grip opposite selvages of the web along a substantial length thereof in a second region of the web spaced away from said first region toward the source of the web, adjustable-speed drive means for said tenter constructed and arranged normally to drive said chains at a first speed different from said predetermined speed, thereby feeding the gripped selvages forwardly toward said first region at a speed different from said predetermined speed and thereby tending to bow the weft threads in said second region; means for detecting the degree of bowing of the weft threads at points within said second region and for producing a control signal in the event that the weft threads acquire a bow of a predetermined extent, said detecting means being operatively connected to control the speed of said drive means; said detecting means being constructed and arrange to temporarily change the speed of said drive means for a predetermined interval to drive said chains and the gripped selvages at a second speed differing from said predetermined speed in an opposite algebraic sense from the first speed, in response to a control signal generated by said detecting means, to restore the speed of said drive means to said first speed after said predetermined interval, and to repetitively alternate the speed of said drive means between said first and sEcond speeds as successive control signals are produced and successive predetermined intervals expire thereafter.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |