Sewing machine with automatic thread cutter

Details Sewing machine with automatic thread cutter Sewing machine with automatic thread cutter

1992-04-23

1992-10-20

Nerbun, Peter

Sewing

Elements

Starting or stopping

112300, 112315, 1122621, D05B 6926, D05B 2722, D05B 6500

Patent

active

051561069

ABSTRACT:
In a sewing machine, when the depressed condition of a foot pedal is changed from a forward depressed condition for high speed sewing to a reverse depressed condition for thread cutting, a braking circuit decreases the rotational speed of the machine motor from a high speed to a low speed. The rotational speed is detected by an encoder. When the rotational speed detected by the encoder becomes a threshold medium speed or less, and a needle-down signal is generated from a needle position detector, the CPU of the sewing machine outputs a work fabric feed pitch control start signal to a work fabric feed pitch selector. The work fabric feed pitch selector reduces or nullifies the feed pitch of the work fabric. Under this condition, in response to the next needle-down signal, the CPU operates a thread cutting mechanism to cut the needle and bobbin threads.

REFERENCES:
patent: 4137860 (1979-02-01), Yoneji et al.
patent: 4516514 (1985-05-01), Neki et al.
patent: 4732099 (1988-03-01), Neki et al.
patent: 4858541 (1989-08-01), Ozawa
patent: 5042408 (1991-08-01), Suzuki et al.

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