Position feedback system

Details Position feedback system Position feedback system

1984-09-14

1987-01-20

Smith, Jerry

Boots, shoes, and leggings

364183, G05B 900

Patent

active

046384219

ABSTRACT:
A position feedback system capable of effectively preventing an NC apparatus from failing in a position signal reading operation due to mechanical vibration of a machine tool or the like, including an up-down counter for counting up or down phase signals supplied from a machine position encoder, a comparator for comparing the counted value with a reference value, and a pulse generator for supplying an up- or down-counting pulse having a time period larger than a minimum time period necessary for the reading operation of the NC apparatus to the comparator to initiate a comparison operation regarding the counter contents which generally reflects the number of phase signals, since spurious noise signals have a tendency to cancel each other out. Based on the comparison, a counting pulse is fed to the NC apparatus and a pulse is applied to the counter to cancel one counted value. The operation is carried out until the counted value becomes the same as the reference value.

REFERENCES:
patent: 4386306 (1983-05-01), Nishimura
patent: 4404626 (1983-09-01), Aoyama
patent: 4451892 (1984-05-01), McMurtry
patent: 4549271 (1985-10-01), Nozama
patent: 4567342 (1986-01-01), Nozawa

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