Incremental measuring and machine control system

Details Incremental measuring and machine control system Incremental measuring and machine control system

1985-07-01

1986-12-16

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

250237G, G01B 1102

Patent

active

046286098

ABSTRACT:
The incremental measuring and machine control system comprises an incremental scale and an auxiliary track extending beside said scale along the same and provided with at least one reference mark in register with a predetermined point of said scale. A scanning unit comprises scanning means for scanning said scale and for generating analog signals in response to the scanning of said scale. The scanning unit comprises additional scanning means for scanning said reference marks and for generating reference signals in response to the scanning of the reference marks. A processor derives digital signals for said analog signals and delivers the digital signals to a counting or display unit which is controlled by said reference signals or by signals derived therefrom. To eliminate the need for separate limit switches or other limiting means in the machine control system, the auxiliary track is provided with control marks and the processor comprises a processor for distinguishing between the reference signals and between control signals generated by said additional scanning means in response to the scanning of said control marks. Said control signals can then be delivered to a control output of the processor and used to control switches for arresting or reversing drive means of the machine control system.

REFERENCES:
patent: 4078173 (1978-03-01), Fultz
patent: 4158509 (1979-06-01), Rieder et al.
patent: 4385836 (1983-05-01), Schmitt
patent: 4400890 (1983-08-01), Ohkubo et al.
patent: 4403859 (1983-09-01), Ernst
patent: 4459750 (1984-07-01), Affa
patent: 4519140 (1985-05-01), Schmitt

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