Patent US3859936A successfully refreshed from Google Patents.
US3859936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabric feeding device for sewing machines
Assignee: Necchi SpA
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Filing: 1974-01-25
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Granted: 1975-01-14
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Expires: 1994-01-25
Abstract
Abstract The invention relates to a fabric feeding device for sewing machines which must travel along a rectangular path in order to grip and advance a fabric past the sewing needle and then release the fabric and return to a starting position. A pneumatic drive cylinder is employed to drive a fabric clamp, said cylinder being rotatable about its own axis in order to effect the respective movements of the clamp towards and away from the fabric.
Inventors
- 👤 Nereo Bianchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:50
CPC Classifications
D; D05; D05B; D05B37/00; D05B37/02; D05B39/00; D05D; D05D2207/00; D05D2207/02; D05D2209/00; D05D2209/04; D10; D10B; D10B2501/00; D10B2501/06; D10B2501/062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A sewing maching having a fabric feeding device comprising: a fabric gripping means and a drive means for driving said gripping means along a rectangular path, said drive means comprising a fluid actuated first cylinder having a first piston therein and a piston rod rigid with said first piston and rigidly attached to said gripping means, whereby reciprocations of said first piston are transmitted to said gripping means in correspondence to two of the parallel sides of said rectangular path, a second cylinder and piston therein, a multi-way valve means for directing a pressurized fluid respectively into opposite ends of said second cylinder so as to drive the second piston alternately in opposite directions, said second piston being drivingly connected to the first mentioned cylinder so as to oscillatingly rotate said first mentioned cylinder and piston about their own axis pursuant to reciprocations of said second piston to drive said gripping means along the other two parallel sides of said path.
Claim 2
Dependent Claim
161 words
A sewing maching having a fabric feeding device comprising: a fabric gripping means and a drive means for driving said gripping means along a rectangular path, said drive means comprising a fluid actuated first cylinder having a first piston therein and a piston rod rigid with said first piston and rigidly attached to said gripping means, whereby reciprocations of said first piston are transmitted to said gripping means in correspondence to two of the parallel sides of said rectangular path, a second cylinder and piston therein, a multi-way valve means for directing a pressurized fluid respectively into opposite ends of said second cylinder so as to drive the second piston alternately in opposite directions, said second piston being drivingly connected to the first mentioned cylinder so as to oscillatingly rotate said first mentioned cylinder and piston about their own axis pursuant to reciprocations of said second piston to drive said gripping means along the other two parallel sides of said path.
Claim 3
Dependent Claim
47 words
The machine of claim 1, wherein the reciprocations of said first piston correspond to reciprocations of said gripping means along the direction of fabric travel while the oscillatory rotations of said cylinder correspond to opposed movements of said gripping means transversely to the direction of fabric travel.
Claim 4
Dependent Claim
17 words
The machine of claim 1, wherein said valve means are Actuated by the first mentioned piston rod.
Claim 5
Dependent Claim
28 words
The machine of claim 2, including a means to vary the length of stroke of said piston whereby the fabric feeding stroke of said gripping means is varied.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |