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:
Jun. 07, 1983
Filed:
Nov. 20, 1980
Yasunori Katayama, Hitachi, JP;
Takanobu Hatakeyama, Katsuta, JP;
Seiya Shima, Katsuta, JP;
Sadao Hokari, Katsuta, JP;
Toshiro Narita, Hitachi, JP;
Kenji Yoneda, Katsuta, JP;
Kazuhiro Sakata, Katsuta, JP;
Tomiaki Kurihara, Katsuta, JP;
Toshio Meguro, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A pulse generator is coupled to a car drive motor directly coupled to a sheave, over which a rope suspending an elevator car is passed, and the position of the car is calculated through the counting of pulses produced from the pulse generator. First and second car position detectors for detecting respective first and second car positions are provided within a hatchway, and the number of pulses produced during a period from the actuation of the first car position detector till the actuation of the second car position detector is detected. A count value for calculating the car position is corrected according to the difference between the detected pulse number and a reference pulse number corresponding to the distance between the first and second car position detectors, thereby effecting the compensation for the wear of the sheave and rope to improve the precision of the car position detection.