Sewing machine with means for synchronizing drive of needle and

Details Sewing machine with means for synchronizing drive of needle and Sewing machine with means for synchronizing drive of needle and

1996-11-19

1998-08-18

Nerbun, Peter

Sewing

Special machines

Pattern controlled or programmed

112220, 112221, 112275, D05B 1900

Patent

active

057945543

ABSTRACT:
A sewing machine including a head portion including a needle bar, the needle bar being for mounting a needle threaded with a needle thread; a principal shaft; a sewing machine motor for driving the needle bar via the principal shaft; a bed portion including a loop taker for taking a thread loop of the needle thread in cooperative operation with the needle; a loop taker drive shaft connected to move in association with the loop taker; a drive motor for driving the loop taker drive shaft independently of the principal shaft; a first detection unit for detecting a rotation condition of the principal shaft and outputting a first detection signal accordingly; a second detection unit for detecting a rotation condition of the loop taker drive shaft and outputting a second detection signal accordingly; and a synchronization control unit for controlling at least one of the drive motor and the sewing machine motor based on the first detection signal from the first detection unit and the second detection signal from the second detection unit so that the loop taker and the principal shaft rotate in synchronization.

REFERENCES:
patent: 4688498 (1987-08-01), Carlson
patent: 5057757 (1991-10-01), Orii
patent: 5078067 (1992-01-01), Nakashima
patent: 5458075 (1995-10-01), Tice et al.
patent: 5474001 (1995-12-01), Tajima et al.
patent: 5505150 (1996-04-01), James et al.

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