Sewing machine with lower thread supply control means

Details Sewing machine with lower thread supply control means Sewing machine with lower thread supply control means

1990-06-08

1991-09-03

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112184, 112278, 112302, D05B 302, D05B 4500

Patent

active

050442929

ABSTRACT:
An amount of a lower thread to be supplied from a bobbin in each stitch forming operation is first determined on a theoretical basis in accordance with the stitch control data stored in a pattern memory. The sewing machine is provided with a bobbin rotation detector which detects every rotation of the bobbin to estimate a lower thread amount which has actually been supplied from the bobbin. A control unit compares the theoretical amount and the practical amount to lead out a correction coefficient which will be applied to the theoretical amount for the next stitch forming operation.

REFERENCES:
patent: 3738296 (1973-06-01), MacKenzie et al.
patent: 4237807 (1980-12-01), Meier et al.
patent: 4566396 (1986-01-01), Sakuma et al.
patent: 4934292 (1990-06-01), Mardix et al.

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