Sewing machine having lower-thread tension changing device

Details Sewing machine having lower-thread tension changing device Sewing machine having lower-thread tension changing device

1995-07-03

1997-10-28

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112255, D05B 302, D05B 4704

Patent

active

056808275

ABSTRACT:
A sewing machine includes a stitch forming device which forms stitches on a work sheet by locking an upper and a lower thread with each other, and a tension changing device which changes a tension of the lower thread to stop supplying of the lower thread to the stitch forming device at a predetermined timing. A sewing machine for forming stitches on a work sheet by locking an upper and a lower thread with each other, includes a pattern selecting device which selects one of a plurality of different stitch patterns, a detecting device which detects the selected one stitch pattern, and a tension changing device which changes, based on the detected one stitch pattern, a maximum tension of the lower thread to a corresponding one of a plurality of different tension values.

REFERENCES:
patent: 4458613 (1984-07-01), Eguchi et al.
patent: 4700644 (1987-10-01), Eguchi et al.
patent: 4938158 (1990-07-01), Hanyu

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