Control system for stopping sewing machine needle at predetermin

Details Control system for stopping sewing machine needle at predetermin Control system for stopping sewing machine needle at predetermin

1989-12-01

1991-10-15

Nerbun, Peter

Sewing

Elements

Starting or stopping

364513, D05B 6922

Patent

active

050564455

ABSTRACT:
A control system is provided for stopping a sewing machine needle at a predetermined position within its reciprocating path. An upper drive shaft rotating at a given rotational speed tends to decrease towards a predetermined lower rotational speed, responsive to a stop command signal. An electric motor is deenergized once the rotational speed reaches the predetermined value, and after that the upper drive shaft continues to rotate by inertia. A pulse number to be generated during the inertia rotation will be determined by an inclination of decrease of rotational speed. Another pulse number to be generated during a period when the stop command signal is generated and when the upper drive shaft rotational speed reaches the predetermined value is determined by application of a selective one or combination of prescribed fuzzy rules, so that the upper drive shaft will come to a standstill at a predetermined position or rotational angle, which governs the predetermined position of the needle.

REFERENCES:
patent: 4777585 (1988-10-01), Kokawa et al.
patent: 4947772 (1990-08-01), Murakami et al.

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