Trimming pressure foot

Details Trimming pressure foot Trimming pressure foot

1989-09-12

1991-03-19

Schroeder, Werner H.

Sewing

Work manipulating

Trimmers

D05B 3704

Patent

active

050001043

ABSTRACT:
A trimming pressure foot that can be interchangeably attached to a sewing machine includes one scissors blade fixedly attached to a pressure foot and one scissors blade pivotable about a shaft. The cutting motion is derived from the up-and-down motion of a needle drive rod. To this end, a pivot lever which is essentially in the shape of an inverted T is used. The pivot lever is pivotable about a shaft connected to the pressure foot, and its upwardly protruding arm rests with spring pressure on a needle securing screw. A flank of the arm resting on the screw forms an acute angle with the path of motion of the needle drive rod. In operation of the sewing machine, the up-and-down motion of the needle drive rod is converted into a pivoting motion of the pivot lever. The pivoting motion of the lever is transmitted onto the pivotable cutting blade by a tang secured to the pivot lever and by engaging the inside of a slit of the blade. The long needle drive rod stroke is thus elegantly and simply translated into a much shorter stroke of the trimming pressure foot.

REFERENCES:
patent: 202908 (1878-04-01), Wilson
patent: 322326 (1885-07-01), Schoen
patent: 801980 (1905-10-01), Glover
patent: 947506 (1910-01-01), Weinbach et al.
patent: 1727850 (1929-09-01), Yates

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