Patent US2531858A successfully refreshed from Google Patents.
Patent US3889614A successfully refreshed from Google Patents.
US3889614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feed for sewing machine
Assignee: Duerkoppwerke GmbH
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Filing: 1974-08-22
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Granted: 1975-06-17
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Expires: 1994-08-22
Abstract
Abstract A sewing machine has a pair of superposed workpiece guides which conduct a pair of workpieces one atop the other to a stitching location with the edges of the workpieces lying directly over one another so that the machine can form a line of stitching parallel to the workpiece edges. A pair of rollers lying in a common plane inclined to the transport direction is provided immediately upstream of the stitching location and their plane intersects the guide edges downstream of these rollers, so that they exert a biasing force on the two workpieces toward the guide edges. The upper roller at least is displaceable transverse to the transport direction out of the path of the upper workpiece so as to allow loading of the machine.
Inventors
- 👤 Karl Nicolay
- 👤 Karl Buschmann
- 👤 Jesus Perez Madueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:26
CPC Classifications
D; D05; D05B; D05B35/00; D05B35/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A workpiece feed for a sewing machine having a pair of laterally open guides provided on a stitching surface adjacent a stitching location thereon and having a pair of guide edges offset from the stitching location and parallel to the machine stitching direction, said feed comprising: a pair of rollers to either side of the stitching surface downstream from said stitching location and each rotatable in a roller plane intercepting said guide edges downstream of said rollers; and a pair of axles defining respective rotation axes transverse to said direction supporting said rollers.
Claim 2
Dependent Claim
93 words
A workpiece feed for a sewing machine having a pair of laterally open guides provided on a stitching surface adjacent a stitching location thereon and having a pair of guide edges offset from the stitching location and parallel to the machine stitching direction, said feed comprising: a pair of rollers to either side of the stitching surface downstream from said stitching location and each rotatable in a roller plane intercepting said guide edges downstream of said rollers; and a pair of axles defining respective rotation axes transverse to said direction supporting said rollers.
Claim 3
Dependent Claim
23 words
The feed defined in claim 1 further comprising meAns for displacing one of said rollers and the respective axis transverse to said direction.
Claim 4
Dependent Claim
18 words
The feed defined in claim 2 further comprising means for pressing said one roller down toward said surface.
Claim 5
Dependent Claim
16 words
The feed defined in claim 3, wherein said rollers both lie in the same roller plane.
Claim 6
Dependent Claim
21 words
The feed defined in claim 4, wherein each of said rollers is provided with a friction surface engageable with said workpieces.
Claim 7
Dependent Claim
36 words
The feed defined in claim 4 wherein said surface is formed with a hole, the other of said rollers engaging through said hole with one of said workpieces and said one roller engaging the other workpiece.
Claim 8
Dependent Claim
30 words
The feed defined in claim 4, further comprising means for lifting said one roller away from said surface on displacement thereof transverse to said stitching direction away from said location.
Claim 9
Dependent Claim
17 words
The feed defined in claim 7, further comprising means for displacing said plane relative to said direction.
Claim 10
Dependent Claim
36 words
The feed defined in claim 8 wherein said means comprises a crank constituting said axle and a socket receiving said crank, whereby rotation of said crank in said socket displaces said plane relative to said direction.
Claim 11
Dependent Claim
60 words
The apparatus defined in claim 6, wherein said guides include a stack of plates, two of which are formed with said edges and two of which extend transverse to said direction across the pass of said workpieces, the uppermost of the latter two plates being formed with a hole through which said one roller is engageable with the respective workpiece.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |