US3104639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel feed differential control for sewing machines
Assignee: GM Pfaff AG
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Filing: 1961-02-10
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Granted: 1963-09-24
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Expires: 1981-02-10
Abstract
No abstract record available.
Inventors
- 👤 Reeber Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
D; D05; D05B; D05B27/00; D05B27/10; D05B27/16; D05D; D05D2209/00; D05D2209/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN COMBINATION WITH A SEWING MACHINE HAVING A FIRST AND A SECOND ROTATING FEED WHEEL ENGAGING AND FEEDING A PLURALITY OF SUPERPOSED WORKPIECE, OPERATING MECHANISM FOR EFFECTING A VARIABLE DIFFERENTIAL FEED BETWEEN SAID WHEELS COMPRISING A DRIVE SHAFT FOR SAID FIRST WHEEL, MEANS TO DRIVE SAID SHAFT AT A FIRST SPEED IN SYNCHRONISM WITH A SEWING OPERATION OF SAID MACHINE, MOTION-TRANSMITTING MEANS OPERABLY CONNECTING SAID SHAFT WITH SAID SECOND WHEEL, TO DRIVE SAID SECOND WHEEL AT A SECOND SPEED HIGHER THAN SAID FIRST WHEEL BY A PREDETERMINED SPEED DIFFERENTIAL, A FRICTION SLIP COUPLING INSERTED IN THE PATH OF SAID TRANSMITTING MEANS, AND MEANS TO CONTINUOUSLY ADJUST THE OPERATING PRESSURE OF SAID COUPLING, TO EFFECT A CONTINUOUS AND INFINITELY VARIABLE DIFFERENTIAL FEED CONTROL INCLUDING ZERO DIFFERENTIAL BETWEEN SAID WHEELS.
Claim 2
Dependent Claim
128 words
IN COMBINATION WITH A SEWING MACHINE HAVING A FIRST AND A SECOND ROTATING FEED WHEEL ENGAGING AND FEEDING A PLURALITY OF SUPERPOSED WORKPIECE, OPERATING MECHANISM FOR EFFECTING A VARIABLE DIFFERENTIAL FEED BETWEEN SAID WHEELS COMPRISING A DRIVE SHAFT FOR SAID FIRST WHEEL, MEANS TO DRIVE SAID SHAFT AT A FIRST SPEED IN SYNCHRONISM WITH A SEWING OPERATION OF SAID MACHINE, MOTION-TRANSMITTING MEANS OPERABLY CONNECTING SAID SHAFT WITH SAID SECOND WHEEL, TO DRIVE SAID SECOND WHEEL AT A SECOND SPEED HIGHER THAN SAID FIRST WHEEL BY A PREDETERMINED SPEED DIFFERENTIAL, A FRICTION SLIP COUPLING INSERTED IN THE PATH OF SAID TRANSMITTING MEANS, AND MEANS TO CONTINUOUSLY ADJUST THE OPERATING PRESSURE OF SAID COUPLING, TO EFFECT A CONTINUOUS AND INFINITELY VARIABLE DIFFERENTIAL FEED CONTROL INCLUDING ZERO DIFFERENTIAL BETWEEN SAID WHEELS.
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) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |