US3793969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Presser bar pressure control modules
Assignee: Singer Co
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Filing: 1972-10-03
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Granted: 1974-02-26
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Expires: 1992-10-03
Abstract
Abstract A presser bar pressure control module which is mounted on a plate separable from the head of the sewing machine containing the presser bar. A mounting plate supports a cam and cam follower operatively connected with a pivotable lever attached to a stud also journaled on the mounting plate. The end of the stud protruding through the other side of the mounting plate is attached to one end of a resilient member the other end of which presses against the presser bar to urge the presser foot attached thereto into contact with the work material. Turning the cam alters the torque impressed on the resilient member thereby to alter the force which the presser foot exerts on the work material.
Inventors
- 👤 K Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:25
CPC Classifications
D; D05; D05B; D05B29/00; D05B29/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
A pressure regulating module for a sewing machine having a presser bar adapted to have a presser foot secured thereto, and means endwise shiftably supporting the presser bar in the sewing machine, the pressure regulating module comprising: a. a mounting plate, b. means for detachably securing said mounting plate to the sewing machine in a predetermined position with respect to said presser bar, c. resilient means for biasing said presser bar endwise, a support for said resilient means carried on said mounting plate and arranged when said mounting plate is secured in said predetermined position with respect to said sewing machine by said securing means to locate said resilient means in a position impinging on said presser bar, d. means for varying the tension in said resilient means comprising a lever and cam follower means shiftably supported on said mounting plate and arranged in cooperative engagement with said resilient means, e. a cam means supported on said mounting plate and arranged in cooperative engagement with said cam follower means to vary the force with which said resilient means impinges on said presser bar.
Claim 2
Dependent Claim
183 words
A pressure regulating module for a sewing machine having a presser bar adapted to have a presser foot secured thereto, and means endwise shiftably supporting the presser bar in the sewing machine, the pressure regulating module comprising: a. a mounting plate, b. means for detachably securing said mounting plate to the sewing machine in a predetermined position with respect to said presser bar, c. resilient means for biasing said presser bar endwise, a support for said resilient means carried on said mounting plate and arranged when said mounting plate is secured in said predetermined position with respect to said sewing machine by said securing means to locate said resilient means in a position impinging on said presser bar, d. means for varying the tension in said resilient means comprising a lever and cam follower means shiftably supported on said mounting plate and arranged in cooperative engagement with said resilient means, e. a cam means supported on said mounting plate and arranged in cooperative engagement with said cam follower means to vary the force with which said resilient means impinges on said presser bar.
Claim 3
Dependent Claim
59 words
A pressure regulating module as set forth in claim 1 wherein said resilient means includes a spring spirally wound in one plane, a stud journaled in said mounting plate, means attaching the inner extremity of said spirally wound spring to said stud, and means responsive to the position of said lever for influencing the angular position of said stud.
Claim 4
Dependent Claim
44 words
A pressure regulating module as set forth in claim 2 wherein a selectively extensible coupling is provided between said cam means and said lever to increase or decrease the torsional windup of said spirally wound spring for the purpose of calibrating the presser system.
Claim 5
Dependent Claim
49 words
A pressure regulating module as set forth in claim 3 in which said selectively extensible coupling comprises said a cam follower element shiftably supported on said mounting plate, an adjusting screw carried in said cam follower element, and an abutment surface formed on said lever engaging said adjusting screw.
References Cited (Backward Citations)
US3303804A
Cited
US3534698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |