Digital controller with A.C. induction drive for sewing machines

Details Digital controller with A.C. induction drive for sewing machines Digital controller with A.C. induction drive for sewing machines

1990-09-17

1993-03-02

Nerbun, Peter

Sewing

Special machines

Darning

112275, 318269, 318616, D05B 1900

Patent

active

051899680

ABSTRACT:
Apparatus for use with an A.C. induction motor drive for a sewing machine to supplant a clutch-brake mechanism by supplying an A.C. induction motor drive to supply power to the motor to control its operating speed and needle position. The control embodies a programmable controller responsive to information loaded into it to derive a profile of how the sewing machine is to operate to sew workpieces, and to generate a control signal which is supplied to the motor drive to operate the motor in accordance with the profile in association with a speed command encoder responsive to a manipulative operator control to produce speed signals to speed up or slow down. The encoder senses the position of the motor and provides a position signal representative of the needle and signals the controller in a closed-loop control system.

REFERENCES:
patent: 3832613 (1974-08-01), Bernstein et al.
patent: 4517909 (1985-05-01), Neki et al.
patent: 4692676 (1987-09-01), Dohi et al.
patent: 4706588 (1987-11-01), Fujikawa
patent: 5006770 (1991-04-01), Sakamoto et al.

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