Sewing – Work manipulating – Guides
Patent
1978-05-24
1980-01-08
Schroeder, Werner H.
Sewing
Work manipulating
Guides
112158E, D05B 306, D05B 302
Patent
active
041822498
ABSTRACT:
A presser bar has a presser attachment for holding fabric placed on a machine bed and a shoe is attached to the presser attachment in such a manner as to be slidable in the fabric feed direction. A first slidable variable resistor is fixed to a lateral surface of the shoe, with its slider connected to the presser bar so as to be displaced. A recess is formed in the machine arm or bed at a certain position and a second slidable variable resistor is mounted in the recess, with its slider projecting therethrough. This slider of the second variable resistor is adapted to be displaced, for example, by a button inserted in the recess and confined between the slider and a wall of the recess. The first variable resistor provides a voltage substantially corresponding to the amount of fabric feed, while the second variable resistor provides a voltage corresponding to the button size. Thus, the length of the buttonhole to be stitched is determined by comparing the fabric feed related voltage with the button size related voltage.
REFERENCES:
patent: 3596618 (1971-08-01), Goldbach
patent: 4016821 (1977-04-01), Minalga
patent: 4019449 (1977-04-01), Hauf
patent: 4056070 (1977-11-01), Hauf
Matumura Nobuyoshi
Tukioka Kotohiko
Falik Andrew M.
Maruzen Sewing Machine Co., Ltd.
Schroeder Werner H.
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