Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1984-11-06
1987-12-29
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 340347P, 74435, 74436, G01D 538
Patent
active
047162902
ABSTRACT:
A rotary encoder includes a train of gears meshed together in a multi-stage so as to reduce the driving number successively and encoders provided with the gear shafts in desired stages in order to count the number of revolutions of a power input shaft. The driving wheel and its corresponding driven wheel between desired two stages of the train of the gears are formed into such intermittent feed means as permitting idling of the driving wheel by cutting off suitable parts of the meshing portion of at least either one of the driving wheel and driven wheel in accordance with the reduction ratio required in driving number between the desired two stages. The present invention can thus provide economical and highly-accurate rotary encoders of the absolute type, which has a wide counterable range, without need for especially-high accuracy with respect to their designing accuracy, the machining accuracy of their gears, assembling accuracy and the like.
REFERENCES:
patent: 2605647 (1952-08-01), Duvoisin
patent: 2881630 (1959-04-01), Opocensky
patent: 3846788 (1974-11-01), Calabro et al.
patent: 4037219 (1977-07-01), Lewis
patent: 4124839 (1978-11-01), Cohen
patent: 4137451 (1979-01-01), Einolf, Jr.
patent: 4511798 (1985-04-01), Killingsworth
patent: 4536762 (1985-08-01), Moates
"Control Engineers' Handbook", John G. Tuxal, Editor 1965, pp. 5-64.
Tamagawa Seiki Co., Ltd "Encoders" Catalog.
Nippon Gear Co., Ltd.
Westin Edward P.
Wieland Charles F.
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