Sewing – Elements – Frames
Patent
1985-01-17
1986-12-30
Reynolds, Wm. Carter
Sewing
Elements
Frames
112250, 112255, D05B 4704, D05B 4900
Patent
active
046320482
ABSTRACT:
The invention relates to a method of controlling an upper thread in a sewing machine. The sewing machine includes a needle holding the upper thread and vertically movable in association with a spindle, a loop taker holding a bobbin case carrier having a lower thread and rotatable in association with the spindle for forming a lock stitch in cooperation with the needle, and a thread take-up lever vertically movable in association with the spindle for loosening or taking up the upper thread. For a period of time from a moment at which a loop of the upper thread is released from a loop taker to a moment at which stitch tightening is completed, a tension required for stitch tightening is rendered to the upper thread. For a period of time from a moment before the loop of the upper thread is passed through a space between a notch and a lug of a rotation restraining finger to a moment after the loop of the upper thread is released from a loop controlling tail of the loop taker, a restraining force which does not permit the upper thread to be delivered from an upper thread supply source is rendered to the upper thread.
REFERENCES:
patent: 1312799 (1919-08-01), Moffatt et al.
patent: 2652017 (1953-09-01), Hohmann
patent: 4215641 (1980-08-01), Dobrjanskyj et al.
Reynolds Wm. Carter
Tokyo Juki Industrial Co. Ltd.
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