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:
Dec. 25, 2001
Filed:
Feb. 18, 2000
Tsuginobu Totani, Numazu, JP;
Kiyoshi Sasaki, Mishima, JP;
Akira Kanda, Numazu, JP;
Yukio Iimura, Shimizu-Cho, JP;
Jun Koike, Shimizu-Cho, JP;
Fumiyuki Katoh, Nagaizumi-Cho, JP;
Masahiro Tamaki, Susono, JP;
Yutaka Yamaguchi, Kannami-Cho, JP;
Toshiba Kikai Kabushiki Kaisha, Tokyo-to, JP;
Abstract
An injection unit including a heating barrel and an injection screw rotationally and axially movable and placed in the heating barrel is disposed on one side of a clamping mechanism for clamping a mold. The injection screw is driven and controlled for operation through a ball screw by an electric motor. Products, each of a moving speed of the ball screw and an operating current supplied to the electric motor in a unit time, are accumulated to calculate a total energy value indicating the amount of total energy supplied to the ball screw. A life energy value is predetermined on the basis of products, each of force generated by the ball screw and a moving speed of the ball screw. It is decided that a life of the ball screw has terminated when the total energy value A is equal to or greater than the life energy B (A≧B).