Bobbin exchanger

Details Bobbin exchanger Bobbin exchanger

1996-01-18

1998-02-17

Lewis, Paul C.

Sewing

Stitch forming

Shuttle type

112279, 112282, 112180, D05B 5726, D05B 5700

Patent

active

057181810

ABSTRACT:
An automatic bobbin exchanger, to be incorporated into a sewing machine, automatically replaces a bobbin case having a bobbin with a small amount of remaining lower thread, with a bobbin case having a fully wound lower-thread bobbin. The automatic bobbin exchanger includes a pair of two dummy shafts and a rotary arm having a grip mechanism for releasably holding a bobbin case. The dummy shafts are provided at positions opposable to a moving path of the rotary arm. One of the dummy shaft holds a fully wound bobbin and the other holds a bobbin with a small amount of the remaining lower thread. Preferably, a remaining-thread mover unit which completely removes the small amount of remaining lower thread around the bobbin and a lower-thread winder which winds lower thread around the empty bobbin may be provided at positions opposable to a moving path of the rotary arm.

REFERENCES:
patent: 3376838 (1968-04-01), Schiffmacher et al.
patent: 4002130 (1977-01-01), Rovin et al.
patent: 4186677 (1980-02-01), Sacchetti
patent: 4223618 (1980-09-01), Cislak
patent: 4681050 (1987-07-01), Kosmas
patent: 5143004 (1992-09-01), Mardix et al.
patent: 5582355 (1996-12-01), Nakamura et al.
patent: 5603273 (1997-02-01), Nakamura et al.

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