Multihead sewing machine with improved shuttle drive control

Details Multihead sewing machine with improved shuttle drive control Multihead sewing machine with improved shuttle drive control

1998-03-16

1999-06-22

Nerbun, Peter

Sewing

Special machines

Pattern controlled or programmed

112155, 112220, 112275, D05B 1912, D05B 5736, D05B 6918, D05B 2100

Patent

active

059132760

ABSTRACT:
A multihead sewing machine includes a sewing machine motor, a main shaft rotated by the sewing machine motor, a plurality of sewing needles driven by the main shaft, a plurality of shuttles for capturing thread loops in cooperation with the sewing needles respectively, each shuttle having a hook shaft, and a plurality of shuttle driving motors for rotating the hook shafts of the shuttles independent of the sewing machine motor respectively. The sewing machine motor and the shuttle driving motors are controlled so that the sewing machine motor and each shuttle driving motor are rotated in synchronism with each other. Loss of synchronism of each shuttle relative to the corresponding sewing needle is detected. Rotation of the main shaft is stopped in an abnormal condition in which the loss of synchronism has been detected with respect to at least one of the shuttles. Furthermore, at least the shuttle driving motor or motors other than the shuttle driving motor regarding which the loss of synchronism has been detected are rotated in synchronism with the main shaft until rotation of the main shaft stops.

REFERENCES:
patent: 5458075 (1995-10-01), Tice et al.
patent: 5791274 (1998-08-01), Akahane et al.
patent: 5794554 (1998-08-01), Akahane et al.

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