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:
Jul. 03, 1990
Filed:
Jul. 21, 1989
Hidetsugu Yamazaki, Ibaraki, JP;
Ryuzaburo Otsuka, Aichi, JP;
Takashi Moro, Ibaraki, JP;
Toshihumi Yuzawa, Aichi, JP;
Seiji Tadano, Kanagawa, JP;
Kiyoshi Tsuchiya, Ibaraki, JP;
Ishikawajima-Harima Kukogyo K.K., all of, JP;
Hitachi Construction Machinery Co., Ltd., all of, JP;
Ohbayashi Corp., all of, JP;
Taisei Corp., all of, JP;
Daiho Construction Co., Ltd., all of, JP;
Abstract
In a control system for synchronous rotation of the cutter heads in a multi-cutter shield machine, the rotation cutter heads are so disposed in generally the same plane such that the distance between the centers of the adjoining cutter heads is larger than the radius, and smaller than the diameter, of the cutter heads. The rotating cutter heads are driven independently of each other by electric drive systems, respectively. Each of the electric drive systems consists of plural motors with a reduction gear, coupled to the respective rotating cutter heads by means of a pinion and gear. The motor rotation is so controlled and the cutter heads are so synchronously rotated, that the angle of deviation between the cutter heads is within such an allowable range that the cutter heads will not interfere with each other even if there is any imbalance in excavating and rotating resistances between the cutter heads.