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:
May. 11, 1982
Filed:
Jun. 06, 1980
Yutaka Yoshida, Kudamatsu, JP;
Ryohei Ishige, Kudamatsu, JP;
Hiroaki Yabu, Kudamatsu, JP;
Yasuo Nabeshima, Kudamatsu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus for controlling the running track of a trackless moving body comprising a guide wire, a position deviation sensor unit mounted on the trackless moving body for sensing a deviation of the position of the moving body relative to the guide wire, a steering control circuit connected to the position deviation sensor unit, and a steering drive unit connected to the steering control circuit for steering the moving body. The steering control circuit comprises a first-order lag circuit receiving the output signal from the position deviation sensor unit, a subtractor receiving the output signal from the position deviation sensor unit and the output signal from the first-order lag circuit, and a comparator receiving the output signal from the subtractor. In the steering control circuit, the output signal from the first-order lag circuit is subtracted in the subtractor from the output signal from the position deviation sensor unit so as to detect the rate of variation of position deviation during a predetermined period of time, and the subtractor output signal including the information of the rate of crane position deviation is compared in the comparator with a reference setting, so that the steering drive unit is actuated depending on the result of comparison for causing approaching movement of the moving body toward the guide wire.