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:
Feb. 02, 1993
Filed:
Apr. 02, 1991
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
A control device for a tool driving unit is disclosed wherein a tool such as a tap or a drill is controlled to be rotated and axially moved by the control device. The tool driving unit has a spindle servo motor adapted to be driven according to a spindle current command and a feed shaft servo motor adapted to be driven according to a feed shaft current command which are provided by a single microcomputer which operates as the control device. The microcomputer reads an NC program and outputs a spindle command for the spindle servo motor when performing tapping, and outputs both the spindle command and a first feed shaft command for the feed shaft servo motor when performing drilling. A thread pitch changing controller for controlling a thread pitch outputs a second feed shaft command for the feed shaft servo motor when performing tapping. A tool selector receives the first feed shaft command and the second feed shaft command and outputs a selected feed shaft command based on the tooling operation being performed. The spindle and feed shaft servo motors are controlled based on the provided command(s) and by detecting actual angular positions and rotational speeds of the servo motors.