Apparatus for positioning carriage in automatic transportation s

Details Apparatus for positioning carriage in automatic transportation s Apparatus for positioning carriage in automatic transportation s

1986-07-07

1987-10-13

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Vehicular guidance systems with single axis control

318567, 318687, 318135, B64C 1318

Patent

active

047001194

ABSTRACT:
An apparatus for positioning a carriage of an automatic transportation system is provided. At least a pair of magnetic cores spaced from each other in the direction of traveling of the carriage are mounted on a floor at a predetermined position within a stop zone on a track of the carriage. A yoke is mounted on a lower surface of the carriage which is disposed within a magnetic field generated by the magnetic cores when the carriage is within the stop zone. A plurality of reflection plates are mounted on the carriage and are equally spaced from one another in the direction of traveling of the carriage. A pair of reflection-type photosensors are mounted on the floor within the stop zone and output a pair of pulse trains 90.degree. out of phase from each other when the carriage moves within the stop zone. Pulses of the pulse trains are counted taking the direction of movement of the carriage into account to produce data representative of deviation of the carriage from a predetermined stop position. Induction coils wound around the magnetic cores are excited in accordance with the data so that the carriage is moved to the predetermined stop position.

REFERENCES:
patent: 3904942 (1975-09-01), Holtz
patent: 4041483 (1977-08-01), Groff
patent: 4367435 (1983-01-01), Bailey et al.
patent: 4404671 (1983-09-01), Kuribayashi

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