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US3777685A Expired / Lapsed US ⏱️ 0.0 years remaining

Sewing machine

Assignee: Mefina SA
•
Filing: 1972-02-29
•
Granted: 1973-12-11
•
Expires: 1992-02-29
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Abstract

Abstract The frame of the machine comprises a base, a column, an upper arm ending in a needle-bearing head, and a lower part containing a cloth transport actuating mechanism. The frame houses a main drive shaft for the machine mechanism and an electric motor. The needle-bearing head includes a presser foot control device movable between an upper and a lower position above the cloth transport element. There is a coupling device between the motor and the main drive shaft and a member which can be actuated by the presser foot control device to prevent the drive of the main shaft by the motor when the presser foot is in upper position. The member is constituted by a mechanical linkage between the presser foot control device and the coupling device to bring the latter into inactive position when the presser foot is brought into upper position. The machine eliminates the risk of being suddenly started by accident.

Inventors

  • 👤 O Baruffa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 20:29
CPC Classifications
D; D05; D05B; D05B29/00; D05B69/00; D05B69/36

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 172 words
In a sewing machine including a frame comprising a base, a column, an upper arm and a needle bearing head, a work-feeding mechanism housed in said base, an electric motor rockably mounted in said column, a main drive shaft for the machine mechanism housed in said upper arm and a presser foot bar mounted in said needle-bearing head, the improvement comprising a first coupling device between said motor and said main shaft, a control lever articulated on said needle-bearing head for moving said presser foot bar between a high position and a low position above said work-feeding mechanism, a rod connected to said lever and housed in the upper arm of said machine, a mechanical linkage system connected with said rod, actuation of said control lever controlling the displacements of said electric motor in a first position, in driving engagement with the said first coupling device when the presser bar is lowered, and in a second position, out of engagement with the said first coupling device, when the presser bar is raised.
Claim 2
Dependent Claim 172 words
In a sewing machine including a frame comprising a base, a column, an upper arm and a needle bearing head, a work-feeding mechanism housed in said base, an electric motor rockably mounted in said column, a main drive shaft for the machine mechanism housed in said upper arm and a presser foot bar mounted in said needle-bearing head, the improvement comprising a first coupling device between said motor and said main shaft, a control lever articulated on said needle-bearing head for moving said presser foot bar between a high position and a low position above said work-feeding mechanism, a rod connected to said lever and housed in the upper arm of said machine, a mechanical linkage system connected with said rod, actuation of said control lever controlling the displacements of said electric motor in a first position, in driving engagement with the said first coupling device when the presser bar is lowered, and in a second position, out of engagement with the said first coupling device, when the presser bar is raised.
Claim 3
Dependent Claim 41 words
A sewing machine according to claim 1, including a bobbin winding device, a second coupling device between the motor and said bobbin winding device, the motor being in driving engagement with said second coupling device when the presser bar is raised.

References Cited (Backward Citations)

US2277475A Cited
US2758558A Cited
US2943586A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-10 1977-06-11 1977-12-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-10 1981-06-11 1981-12-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-10 1985-06-11 1985-12-11 $7700.00 Window Closed / Lapsed

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