Sewing machine with reference speed correction by dimensional ra

Details Sewing machine with reference speed correction by dimensional ra Sewing machine with reference speed correction by dimensional ra

1986-05-12

1987-06-30

Nerbun, Peter

Sewing

Elements

Starting or stopping

D05B 6918

Patent

active

046761802

ABSTRACT:
A sewing machine comprises a multiplier for multiplying an operator-controlled variable reference speed value by a multiplying factor, a tachogenerator for generating speed-related pulses at a rate proportional to the speed of rotation of a motor pulley and an angular position detector for generating a position pulse in response to a predetermined position of an armshaft pulley which is coupled by a belt to the motor pulley. A ratio detector is provided for counting the speed-related pulses present during the interval between successive ones of the position pulse to generate a count as a representation of the diameter of the armshaft pulley and deriving a ratio value between the count and a value representative of the diameter of the motor pulley. The ratio value is applied to the multiplier as the multiplying factor to alter the reference speed value. A speed control circuit is responsive to the speed-related pulses for deriving an actual motor speed value and controls the speed of the motor in accordance with a difference between the actual motor speed value and the altered reference speed value.

REFERENCES:
patent: 4080914 (1978-03-01), Ishida et al.
patent: 4473020 (1984-09-01), Neki et al.
patent: 4516514 (1985-05-01), Neki et al.

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