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:
Sep. 08, 1992
Filed:
May. 04, 1990
Taisuke Kawamata, Okazaki, JP;
Toshio Maruyama, Kariya, JP;
Hidetaka Irie, Okazaki, JP;
Masayoshi Inoue, Nagoya, JP;
Shinji Nishio, Kariya, JP;
Koichi Murayama, Toyota, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Abstract
An indexing mechanism in a machine tool for selectively positioning plural pin portions of a crankshaft at the machining position aligned with the work spindle, wherein a indexing member engaging with the crankshaft through an engaging pin is rotated by an indexing motor through a gear train. The crankshaft is initially rotated in a first direction until a selected pin portion engages with a rest shoe of a rest device provided on the bed in order to be positioned in a reference angle position, in which the selected pin portion is located at the machining position aligned with a work spindle. The crankshaft is then clamped on the chucking device. After that, the indexing motor is rotated in a second direction opposite to the first direction until the load of the motor exceeds a reference level, so that the influence of a backlash in the gear train and a clearance between the engaging pin and the crankshaft is eliminated. After the completion of a grinding operation on the selected pin portion, the indexing member is thereafter rotated in the second direction by a predetermined amount so as to position a next pin portion in the machining position.