Adjusting device of slack amount of lower thread in zigzag sewin

Details Adjusting device of slack amount of lower thread in zigzag sewin Adjusting device of slack amount of lower thread in zigzag sewin

1985-09-19

1987-09-15

Reynolds, Wm. Carter

Sewing

Stitch forming

Zigzag

112231, 112242, 112255, 112260, 112324, D05B 302, D05B 2700, D05B 4900, D05B 5726

Patent

active

046931988

ABSTRACT:
There is a zigzag sewing machine provided with a horizontal rotary loop taker device which is restrained with respect to the rotation direction, and holds therein a bobbin carrier horizontally attached, and is supplied with a lower threads from the left side to the left basic line marked with an axial line in front of the needle, and provided with a feed dog which is provided nearly to passage of the needle to move vertically and laterally. In such a sewing machine a cam portion is provided for supplying the lower thread to a lower thread contacting portion of the bobbin carrier or a lower thread contacting portion of a part connecting right and left teeth of the feed dog, whereby the amount of supplying the lower thread is adjusted properly with respect to the left basic line and the right basic line during zigzag stitching, and the slack amount of the lower thread is adjusted properly with respect to the left basic line and the right basic line during forming stitches. A cam portion is provided to the lower thread contacting portion of a needle plate for guiding the lower thread to change the passage of the lower thread, whereby the slack amount of the lower thread may be adjusted properly with respect to the left basic line and the right basic line during forming stitches, and the lower thread of the zigzag stitch is made pretty on a rear side of the sewn fabric.

REFERENCES:
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patent: 2900940 (1959-08-01), Johnson
patent: 3390653 (1968-07-01), Ketterer
patent: 3693563 (1972-09-01), Ketterer
patent: 3894499 (1975-07-01), Hamlett
patent: 4215639 (1980-08-01), Johnson
patent: 4340003 (1982-07-01), Hanyu et al.
patent: 4423693 (1984-01-01), Hanyu et al.
patent: 4437421 (1984-03-01), Johnson
patent: 4458613 (1984-07-01), Eguchi et al.

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