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:
Nov. 13, 2001
Filed:
Apr. 08, 1996
Tetsushi Yano, Itabashiku, JP;
Ryuta Yamawaki, Itabashiku, JP;
Toshio Sadamitsu, Itabashiku, JP;
Yukinori Arai, Itabashiku, JP;
Copal Company Limited, Tokyo, JP;
Abstract
A motor with a lead screw is provided with a pre-load generating member for canceling backlash in the axial direction, and the lead screw formed with a feed screw groove portion serves as the output shaft of the motor. The pre-load generating mechanism is constituted by a blind hole, a biasing member, and a movable member. The blind hole is formed concentrically in one end of the lead screw. The biasing member is inserted in the blind hole and has a stroke sufficient to generate a biasing force. The movable member is inserted in the blind hole next to the biasing member to receive the biasing force, and is held to be movable in the axial direction in the blind hole. Hence, the motor with a lead screw can be made short in the axial direction. The biasing member is set to have a sufficiently long stroke so that the stability of the pre-load generating member is maintained high, thereby eliminating backlash in the axial direction.