US3797426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled thread tensioner for sewing machines
Assignee: Union Special GmbH
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Filing: 1972-03-31
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Granted: 1974-03-19
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Expires: 1992-03-31
Abstract
Abstract This disclosure relates to a controlled thread tensioner for sewing machines which includes a pair of oppositely movable tension discs, one of which is under the influence of a control bolt, and which control bolt has a portion thereof positioned adjacent a permanent magnet carried by a control shaft of the sewing machine for automatically shifting the position of the control bolt in timed relation to the operation of the sewing machine so as to vary the tension applied to thread by the tension discs.
Inventors
- 👤 Hagen W Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:04
CPC Classifications
D; D05; D05B; D05B47/00; D05D; D05D2207/00; D05D2207/05; D05D2207/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
A controlled thread tensioner for sewing machines and like equipment having a rotating control shaft, a pair of opposed cooperating thread tensioning discs, means normally holding said discs in cooperating thread tensioning reLation, said means including a pressure control disc, a control bolt coupled to said control disc for positioning said control disc and controlling the pressure engagement between said cooperating discs, permanent magnet means carried by said control shaft, and means directly reacted upon by said magnet means once during each revolution of said control shaft directly movable with said control bolt for positioning said control bolt and effecting one tensioning cycle of said cooperating discs per control shaft revolution, said control bolt carrying a magnetic reactive part and positioning the same immediately adjacent the path of said permanent magnet means, and said control bolt including adjusting means for adjusting the spacing between said control disc and said magnetic reactive part to vary the position of said magnetic reactive part relative to said permanent magnet means path and thus vary the clamping effect of said control bolt on said cooperating discs.
Claim 2
Dependent Claim
182 words
A controlled thread tensioner for sewing machines and like equipment having a rotating control shaft, a pair of opposed cooperating thread tensioning discs, means normally holding said discs in cooperating thread tensioning reLation, said means including a pressure control disc, a control bolt coupled to said control disc for positioning said control disc and controlling the pressure engagement between said cooperating discs, permanent magnet means carried by said control shaft, and means directly reacted upon by said magnet means once during each revolution of said control shaft directly movable with said control bolt for positioning said control bolt and effecting one tensioning cycle of said cooperating discs per control shaft revolution, said control bolt carrying a magnetic reactive part and positioning the same immediately adjacent the path of said permanent magnet means, and said control bolt including adjusting means for adjusting the spacing between said control disc and said magnetic reactive part to vary the position of said magnetic reactive part relative to said permanent magnet means path and thus vary the clamping effect of said control bolt on said cooperating discs.
Claim 3
Dependent Claim
37 words
The thread tensioner of claim 1 wherein said magnetic reactive part includes a guide shoe, and fixed means cooperating with said guide shoe for restricting movement of said guide shoe to movement axially of said control bolt.
Claim 4
Dependent Claim
26 words
The thread tensioner of claim 1 wherein said magnetic reactive part includes an arcuate disc closely fitting the path of movement of said permanent magnet means.
Claim 5
Dependent Claim
28 words
The thread tensioner of claim 1 wherein said permanent magnet means is supported by a carrier having means circumferentially adjustably mounting said carrier relative to said control shaft.
Claim 6
Dependent Claim
66 words
The thread tensioner of claim 1 wherein said control bolt is slidably mounted in a casing, said casing passing through said control disc, and means carried by said casing reacting on said control disc to maintain a normal relationship between said cooperating discs, and movement of said bolt by said permanent magnet means is in a direction to increase the pressure engagement between said cooperating discs.
Claim 7
Dependent Claim
47 words
The thread tensioner of claim 1 wherein said permanent magnet means includes at least two circumferentially spaced and cooperating permanent magnets for reacting in unison on said means reacted upon by said magnets and having a magnet field of controlled circumferential extent and of generally uniform magnitude.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |