Circuit arrangement for positioning the printing mechanisms in p

Details Circuit arrangement for positioning the printing mechanisms in p Circuit arrangement for positioning the printing mechanisms in p

1983-01-31

1985-04-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

318480, 377 17, G01D 534

Patent

active

045117977

ABSTRACT:
A d.c. motor positions printing mechanisms. A circuit arrangement is provided in which a scanner disc, having peripheral slots, is arranged on the shaft of the motor and the slots are scanned by a scanner and counted in the positive direction and in the negative direction by a counter so that the position of the printing mechanism is determined. When the d.c. motor is decelerated and a generator voltage arises, the direction is determined by a rotation direction discriminator which evaluates the generator voltage and the zero transition thereof in the event of a change in the rotation direction of the d.c. motor. To control the direction of counting of the counter.

REFERENCES:
patent: 3935447 (1976-01-01), Black et al.
patent: 4112413 (1978-09-01), Muhs et al.
patent: 4463435 (1984-07-01), Cavill

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