Bobbin winding actuation by presser foot up switch

Details Bobbin winding actuation by presser foot up switch Bobbin winding actuation by presser foot up switch

1983-08-24

1984-07-03

Nerbun, Peter P.

Sewing

Elements

Driving mechanisms

112237, 112279, 1122621, D05B 6902, D05B 6920

Patent

active

044572450

ABSTRACT:
An apparatus and method for implementing bobbin winding in place in a looptaker of a sewing machine. When a presser foot lift lever is manipulated to elevate a presser foot, and the sewing machine motor is activated, a series of two or three endwise reciprocations of the sewing machine is effected to bring an upper thread to the lower thread carrying bobbin, after which further endwise reciprocation of the sewing needle is held in abeyance while actuation of the sewing machine motor is continued, to provide the least disturbance of upper thread passage to the lower thread bobbin. No other bobbin winding signaling steps are required.

REFERENCES:
patent: 3750603 (1973-08-01), Martin
patent: 3815532 (1974-06-01), Weisz et al.
patent: 4216733 (1980-08-01), Kornatowski

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