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:
Oct. 13, 2026
Filed:
Jan. 26, 2023
Citizen Watch Co., Ltd., Tokyo, JP;
Citizen Machinery Co., Ltd., Nagano, JP;
Erisha Hayashi, Nagano, JP;
CITIZEN WATCH CO., LTD., Tokyo, JP;
CITIZEN MACHINERY CO., LTD., Nagano, JP;
Abstract
A machine tool includes a driver that drives a main spindle for holding a workpiece rotatably, a servo motor that drives a tool for machining the workpiece held on the main spindle, a power source that supplies electric power to at least the driver and the servo motor, a current detector that detects a current value to be inputted into the servo motor, a storage that stores an upper limit of the current value to be inputted into the servo motor, and a controller that controls the servo motor to execute driving control of the tool. When a current value detected by the current detector exceeds the upper limit of the current value immediately after starting the main spindle, the controller changes an acceleration/deceleration time constant from a first time constant to a second time constant that is lower in power consumption than the first time constant, thereby controlling the servo motor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile