Electronically controlled sewing machine

Sewing – Stitch forming – Zigzag

Patent

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Details

112220, 112275, 318432, 318434, 318799, 318476, D05B 302

Patent

active

049810960

ABSTRACT:
An electronically controlled sewing machine, comprises a current detecting device for detecting a value of current flowing through a stepping motor that drives a machine part and current setting means for setting a value of current to be applied to the stepping motor. The sewing machine further includes a control device (CPU) for storing a plurality of different values of currents to be applied to the stepping motor and driving the stepping motor until the stepping motor passes through an initial position thereof. The control device stops the stepping motor at a predetermined angular position thereof spaced from the initial position. The control device supplies the different values of currents to the stepping motor in a predetermined sequence from a smallest value to a larger value of current under a predetermined program to drive the stepping motor until the stepping motor reaches the initial position thereof. The control device further determines a current value that has driven the stepping motor to the initial position at a last step of current supply to establish a basis for setting a current value which is specific to the stepping motor.

REFERENCES:
patent: 4315472 (1982-02-01), Makabe et al.
patent: 4322668 (1982-03-01), Trussler et al.
patent: 4677925 (1987-07-01), Murakami et al.

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