Position detecting apparatus

Details Position detecting apparatus Position detecting apparatus

1991-09-09

1992-10-27

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

318626, G05B 1101

Patent

active

051592487

ABSTRACT:
A mechanism for moving an object rectilinearly by reducing the speed of motor rotation and converting this rotational motion into rectilinear motion is provided with a first sensor for generating first pulses having a frequency conforming to the rotational speed of the motor, a second sensor for generating second pulses having a frequency conforming to the reduced rotational speed and a pulse interval which is n times that of the first pulses, and third sensor for generating a third output when the object arrives at a predetermined position. A counter is initialized when the first pulse, second pulse and third output satisfy a predetermined condition. Depending upon the direction in which the object is moved, the first pulses are counted up or down by counter. Whenever the second pulses are generated, the count recorded in the counter is forcibly corrected to the value of n.times.m (where m is 0 or an integer) that is closest to the count.

REFERENCES:
patent: 4401930 (1983-08-01), Kato et al.

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