Patent US3583344A successfully refreshed from Google Patents.
US3583344A
Expired / Lapsed
US
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Top feed means for sewing machines
Assignee: GM Pfaff AG
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Filing: 1970-07-01
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Granted: 1971-06-08
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Expires: 1990-07-01
Abstract
Abstract Top feed device for sewing machines having a top feed transport rocking means in the form of a double lever connected with one each connecting bar with a forward feed and a raising drive means and a spring loaded material presser foot operatively connected with the top feed rocking lever, characterized in that one arm (35) of the top feed lever (32) is coupled with two generally parallel disposed link bars (33, 36) of essentially equal length, one of which (33) is pivoted on the housing (1) of the machine while the other (36) is in operative connection with the feeding drive by way of a crank arm (37) extending essentially parallel to the arm (35).
Inventors
- 👤 Gunter Meier
- 👤 Herbert Wenz
- 👤 Wilhelm Windschugl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:54
CPC Classifications
D; D05; D05B; D05B27/00; D05B27/02; D05B27/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
212 words
In a sewing machine having a housing presenting a head and having a drive shaft, top feed means comprising a rocking shaft extending through said housing to said head, a crank arm connected to said rocking shaft in said machine head, an eccentric bar connected at one end to said drive shaft and a rocking yoke supported in said housing connected to the other end of said eccentric bar, a spring-biased presser foot bar, a top feed foot, a double-armed top feed lever, supporting with one arm at its lower end said top feed foot, means operative for guiding the movements of said top feed lever and linking said top feed lever to said presser foot bar comprising, a pair of parallel link members, one extending bEtween and connecting said top feed lever and said housing and defining a pivot joint with said top feed lever, and the other extending between and connecting the upper end of said top feed lever and said crank arm, and an articulated toggle joint including a pivot pin connecting two link bars, one connected intermediate said pivot joint and said rocking yoke by way of a link member and the other extending intermediate and connecting the upper end of said presser bar and said pivot pin.
Claim 2
Dependent Claim
212 words
In a sewing machine having a housing presenting a head and having a drive shaft, top feed means comprising a rocking shaft extending through said housing to said head, a crank arm connected to said rocking shaft in said machine head, an eccentric bar connected at one end to said drive shaft and a rocking yoke supported in said housing connected to the other end of said eccentric bar, a spring-biased presser foot bar, a top feed foot, a double-armed top feed lever, supporting with one arm at its lower end said top feed foot, means operative for guiding the movements of said top feed lever and linking said top feed lever to said presser foot bar comprising, a pair of parallel link members, one extending bEtween and connecting said top feed lever and said housing and defining a pivot joint with said top feed lever, and the other extending between and connecting the upper end of said top feed lever and said crank arm, and an articulated toggle joint including a pivot pin connecting two link bars, one connected intermediate said pivot joint and said rocking yoke by way of a link member and the other extending intermediate and connecting the upper end of said presser bar and said pivot pin.
Claim 3
Dependent Claim
21 words
Top feed means in accordance with claim 1, where said two link bars defining said articulated toggle joint extend generally vertically.
Claim 4
Dependent Claim
36 words
Top feed means in accordance with claim 2, where said presser foot is connected to said presser bar by rotation preventing means including a sliding guide device in the form of a slot and a screw.
References Cited (Backward Citations)
US2241129A
Cited
US2470759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |