Presser foot drive linkage in a sewing machine

Details Presser foot drive linkage in a sewing machine Presser foot drive linkage in a sewing machine

1982-07-30

1984-12-11

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

112235, D05B 2704, D05B 2902

Patent

active

044871457

ABSTRACT:
A sewing machine includes a presser foot which is driven on a main shaft by an eccentric drive which drives through a toggle mechanism to a crank lever driver which effects the raising of the presser foot synchronously with the upward movement of a sewing machine needle so as to release a workpiece for movement relative to the needle. The presser foot is biased downwardly by a spring which may be adjusted as to its tension. During a sewing operation a driver is moved to a position only slightly disengaged from the lifting surface of the presser foot and during periods of engagement of the presser foot with the workpiece the toggle mechanism ensures that the presser foot engages the workpiece gently, irrespective of the adjusted amount of total lift of the presser foot by the drive mechanism.

REFERENCES:
patent: 3570427 (1971-03-01), Wenz
patent: 3583344 (1971-06-01), Meier
patent: 3614934 (1971-10-01), Wenz et al.
patent: 3757714 (1973-09-01), Gustmann et al.
patent: 3927629 (1975-12-01), Vollmar
patent: 4067275 (1978-01-01), Willenbacher

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