Communications: electrical – Systems – Call station
Patent
1977-01-21
1980-01-08
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
250231SE, 340190, 340347P, G08C 1928, G08C 906
Patent
active
041830148
ABSTRACT:
First and second similar rotary encoders are interconnected such that the first encoder actuates the second encoder to advance one position for each half revolution of the first encoder. The first encoder is coupled to monitor the position of a rotary component. If the encoders are shifted or off-set by up to 90.degree. to either side of precise zero crossover alignment, a logic comparator modifies the reading of the second encoder to create a true read-out. During each half revolution of the first encoder, the second encoder should read even or odd if a proper phasing exists. If the second encoder produces an opposite reading, a phase shift is indicated. A logic circuit, preferably a microprocessor is provided for combining and modifying the readout in accordance with the logic. A microprocessor includes a program to continuously sample the position of the successive encoders with an internal table applied to the position readouts to provide a correct and true value of the rotary component position.
REFERENCES:
patent: 3262108 (1966-07-01), Schuman
patent: 3276010 (1966-09-01), Mountjoy
patent: 3668690 (1972-06-01), Ormond
patent: 3705400 (1972-12-01), Cordes
patent: 3846788 (1974-11-01), Calabro et al.
Budge Daniel C.
McClean William G.
Caldwell Sr. John W.
Groody James J.
Tri-N Associates, Inc.
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