Self adjusting tachometer

Details Self adjusting tachometer Self adjusting tachometer

1977-11-22

1979-01-02

Kominski, John

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250233, G01D 536

Patent

active

041328906

ABSTRACT:
The disclosure describes an electro-optical tachometer assembly for use with a device having a movable part and a fixed part (for example, a motor, an electrophotographic system, etc). The electro-optical tachometer assembly comprises a movable assembly and a fixed assembly. The movable assembly includes a movable disk while the fixed assembly includes a fixed mask. A gap between the movable disk and the fixed mask is preset by a spacer assembly. The gap is maintained constant by a resilient member which loads the fixed assembly against the movable assembly.
A light emitting diode (LED) phototransistor assembly is situated relative to the tachometer assembly and outputs electrical signals indicative of shaft speed, direction of shaft rotation, etc. Synchronization of the tachometer output to the shaft is accomplished by a guide pin arrangement.

REFERENCES:
patent: 2946893 (1960-07-01), Baum
patent: 3693024 (1972-09-01), Hulle et al.
patent: 3770971 (1973-11-01), Somerset
patent: 3942112 (1976-03-01), Westbrook
patent: 3995156 (1976-11-01), Angersbach et al.
patent: 3997782 (1976-12-01), Willits

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