US3698334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position signaling devices for sewing machine driving unit
Assignee: Singer Co
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Filing: 1971-06-10
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Granted: 1972-10-17
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Expires: 1991-06-10
Abstract
Abstract A direct drive unit for a sewing machine applied on the sewing machine frame co-axially of the sewing machine main shaft including a device for producing signals responsive to discrete positions of the sewing machine main shaft. The position signaling device is capable of indicating a plurality of different angular positions of the sewing machine main shaft, which positions may be selected simply by turning frictionally restrained arms accessibly located on the free extremity of the drive unit into the angular positions for which signals are desired.
Inventors
- 👤 Johann O Kleinschmidt
- 👤 Heinz E Walter
- 👤 Helmar H Holl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:22
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22; D05B69/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A position-signaling device for the actuating mechanism of a sewing machine having a frame and a main drive shaft journaled in said frame, said position-signaling device comprising a stationary signal generating member secured in a fixed position relatively to said sewing machine frame, a movable member adapted to render said signal generating member effective in response to passage of said movable member closely adjacent thereto, means supporting said movable member for rotatioN in a path traversing closely adjacent to said stationary signal generating member, and a friction coupling drivingly interconnecting said movable member with said sewing machine main drive shaft, said friction coupling being such as to require for slippage of said movable member relatively to said sewing machine main drive shaft a torque which is greater than the maximum torque generated by the inertia of said movable arm during acceleration of said sewing machine main drive shaft.
Claim 2
Dependent Claim
148 words
A position-signaling device for the actuating mechanism of a sewing machine having a frame and a main drive shaft journaled in said frame, said position-signaling device comprising a stationary signal generating member secured in a fixed position relatively to said sewing machine frame, a movable member adapted to render said signal generating member effective in response to passage of said movable member closely adjacent thereto, means supporting said movable member for rotatioN in a path traversing closely adjacent to said stationary signal generating member, and a friction coupling drivingly interconnecting said movable member with said sewing machine main drive shaft, said friction coupling being such as to require for slippage of said movable member relatively to said sewing machine main drive shaft a torque which is greater than the maximum torque generated by the inertia of said movable arm during acceleration of said sewing machine main drive shaft.
Claim 3
Dependent Claim
124 words
A position-signaling device as set forth in claim 1 in which a hub member drivingly interconnected with said sewing machine drive shaft has journaled on it a rotatable arm which carries said movable member for rotation, in which said friction coupling comprises a flange on said hub member against which one side of the rotatable arm abuts, spring means engaging the opposite side of the rotatable arm, and means on said hub member for maintaining said spring means under sufficient tension as to require for slippage of said rotatable arm relatively to said sewing machine main drive shaft a torque which is greater than the maximum torque generated by the inertia of said rotatable arm during acceleration of said sewing machine main drive shaft.
Claim 4
Dependent Claim
46 words
A position-signaling device as set forth in claim 1 in which said signal generating means comprises an electrical coil and in which said movable member includes a permanent magnet arranged to induce a voltage signal in said coil upon passage of said member closely adjacent thereto.
Claim 5
Dependent Claim
134 words
A position-signaling device for a sewing machine having a frame, a main drive shaft journaled in said frame, and a direct driving unit secured to said sewing machine frame and including an electric motor with a motor shaft interconnected at one end with said sewing machine main drive shaft, said position-signaling device comprising an arm loosely journaled in an accessible position on the free extremity of said electric motor shaft, signal generating means supported in fixed position relatively to said sewing machine frame adjacent to the path of rotation of said arm for providing a pulse responsive to each movement of said arm through a discrete angular segment of said path of rotation, and a friction coupling between said motor shaft and said arm permitting manual rotary adjustment of said arm on said shaft.
Claim 6
Dependent Claim
134 words
A position-signaling device for a sewing machine having a frame, a main drive shaft journaled in said frame, and a direct driving unit secured to said sewing machine frame and including an electric motor with a motor shaft interconnected at one end with said sewing machine main drive shaft, said position-signaling device comprising an arm loosely journaled in an accessible position on the free extremity of said electric motor shaft, signal generating means supported in fixed position relatively to said sewing machine frame adjacent to the path of rotation of said arm for providing a pulse responsive to each movement of said arm through a discrete angular segment of said path of rotation, and a friction coupling between said motor shaft and said arm permitting manual rotary adjustment of said arm on said shaft.
Claim 7
Dependent Claim
88 words
A position-signaling device as set forth in claim 4 in which said electric motor shaft of said direct driving unit is supported in substantial axial alignment with said sewing machine drive shaft, in which a handwheel accessible to an operator of the sewing machine is fast on said sewing machine main drive shaft between the sewing machine frame and the electric motor of the direct driving unit, and in which a removable cover is provided for the position-signaling device at the free extremity of the electric motor shaft.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |