Article positioner with zero position sensing means

Details Article positioner with zero position sensing means Article positioner with zero position sensing means

1975-06-27

1977-05-03

Schaefer, Robert K.

Electricity: motive power systems

Automatic and/or with time-delay means

Radiant energy

H02H 300

Patent

active

040217116

ABSTRACT:
An article handler or positioner includes an X-Y table driven by reversible stepping motors. Zero position sensors function to provide an output signal when the X-Y table moves into a zero or home or reference position. The sensors are electro-optical devices having two beams of light one of which is gradually interrupted while the other one is gradually uninterrupted as the table moves into the zero position. Photo detectors provide output signals one of which increases and the other of which decreases as the table moves into the zero position and, at the point of crossover of the respective output signals, another output signal is generated indicating the home position is reached. This signal is then used to inhibit further operation of the driving motors.

REFERENCES:
patent: 3484666 (1969-12-01), Easton
patent: 3590356 (1971-06-01), Hofmeister
patent: 3643018 (1972-02-01), Adler
patent: 3708681 (1973-01-01), Ivers
patent: 3749203 (1973-07-01), Hoelscher
patent: 3809987 (1974-05-01), Suhr et al.

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