The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1987
Filed:
Jul. 07, 1986
Mitsuji Karita, Mie, JP;
Shinko Electric Co., Ltd., Tokyo, JP;
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.