Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-06-05
1982-05-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340347P, G01D 534
Patent
active
043318665
ABSTRACT:
An electro-mechanical digital feed apparatus is provided with an optical encoder control unit. The control unit comprises a system of photocells and LED light sources, separated by program discs having precisely spaced holes therein. The discs are mounted on rotating shafts which are linked to a shaft of the processing machine, so that the disc shafts rotate at a constant fraction of the rotational speed of the processing machine shaft. As a disc hole passes between an LED and a photocell, the photocell produces a pulse of electrical energy which is amplified to provide input power for an electrical stepping motor. Means are provided for selectively varying the number of pulses generated per revolution of the processing machine shaft. The discs are provided with a plurality of programs in the form of concentric circular bands containing different numbers of holes. Some of the discs are mounted on shafts that run at higher speeds than others and have a uniform zero position where no holes are contained. Pulses from the regular speed shafts are generated during zero positions of the higher speed shafts and may be added in selectable numbers to the pulses produced by the higher speed shafts. By selecting the discs which input pulses to the pulse train, a pulse train containing a selectable number of uniformly spaced pulses per revolution of the machine shaft can be input to the stepping motor, providing a smooth and selectable feed control.
REFERENCES:
patent: 3525094 (1970-08-01), Leonard
patent: 3623079 (1971-11-01), Schuman
patent: 4123653 (1978-10-01), Bovio
American Electronic Laboratories, Inc.
Nelms David C.
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