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US4538533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Workpiece holding-down device for a sewing machine
Assignee: TOKYO JUKI INDUSTRIAL Co LT
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Filing: 1983-09-26
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Granted: 1985-09-03
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Expires: 2003-09-26
Abstract
Abstract A workpiece holding-down device for a sewing machine comprises a spring-loaded presser bar and foot assembly supported in the framework of said sewing machine, a drive mechanism for moving said assembly vertically, and a control circuit for controlling the movement of said presser bar. The foot assembly includes signal means for positioning the presser bar and foot assembly in a controlled position in response to the actuation of an operation member or stored information.
Inventors
- 👤 Torao Ohchi
- 👤 Hideo Yasui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:40
CPC Classifications
D; D05; D05B; D05B29/00; D05B29/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A workpiece holding-down device for a sewing machine comprising a vertically movable workpiece holding-down means including a vertical presser bar and a substantially horizontal presser foot pivoted to the lower end of said pressure bar; a drive mechanism for moving the presser foot; and a control mechanism for controlling said drive mechanism so as to position the presser foot in a controlled position; said drive mechanism comprises a motor, means operatively connected to said motor to convert the rotation of the motor into a linear movement and a linkage operatively connected to said conversion means to transmit said linear movement to said presser bar.
Claim 2
Dependent Claim
104 words
A workpiece holding-down device for a sewing machine comprising a vertically movable workpiece holding-down means including a vertical presser bar and a substantially horizontal presser foot pivoted to the lower end of said pressure bar; a drive mechanism for moving the presser foot; and a control mechanism for controlling said drive mechanism so as to position the presser foot in a controlled position; said drive mechanism comprises a motor, means operatively connected to said motor to convert the rotation of the motor into a linear movement and a linkage operatively connected to said conversion means to transmit said linear movement to said presser bar.
Claim 3
Dependent Claim
23 words
The workpiece holding-down device for a sewing machine as set forth in claim 1, in which said conversion means comprises a threaded mechanism.
Claim 4
Dependent Claim
162 words
A workpiece holding-down device for a sewing machine comprising: a vertical presser bar supported in the machine framework of said sewing machine for vertical movement and having a presser foot pivoted to the lower end of said presser bar; p1 a holding-down spring disposed about said presser bar for normally urging the presser foot downwardly; signal means for producing a push-up signal in response to the operation of an operator's operation member or a program information stored in memory means; a drive mechanism operable in response to said push-up signal; a vertically movable tubular member interlocked with said drive mechanism for movement between two predetermined positions; interlocking means disposed between said tubular member and presser bar for moving said workpiece holding-down means in response to the movement of the tubular member; and a resilient member disposed about said tubular member between the tubular member and said machine framework to normally urge the tubular member upwardly against the force of said holding-down spring.
Claim 5
Dependent Claim
162 words
A workpiece holding-down device for a sewing machine comprising: a vertical presser bar supported in the machine framework of said sewing machine for vertical movement and having a presser foot pivoted to the lower end of said presser bar; p1 a holding-down spring disposed about said presser bar for normally urging the presser foot downwardly; signal means for producing a push-up signal in response to the operation of an operator's operation member or a program information stored in memory means; a drive mechanism operable in response to said push-up signal; a vertically movable tubular member interlocked with said drive mechanism for movement between two predetermined positions; interlocking means disposed between said tubular member and presser bar for moving said workpiece holding-down means in response to the movement of the tubular member; and a resilient member disposed about said tubular member between the tubular member and said machine framework to normally urge the tubular member upwardly against the force of said holding-down spring.
Claim 6
Dependent Claim
24 words
The workpiece holding-down device for a sewing machine as set forth in claim 3, in which said resilient member is formed of resilient plastic.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |