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:
Jan. 03, 1995
Filed:
Aug. 31, 1993
Hidemi Aoki, Sakakimachi, JP;
Nissei Plastic Industrial Co., Ltd., Nagano, JP;
Abstract
A motor driven type die tightening apparatus for an injection molding machine includes a plurality of tie bars horizontally bridged between a pair of stationary die boards mounted on a platform of the injection molding machine, and a movable die board is displaceably arranged between the stationary die boards with the tie bars inserted therethrough. A part of each of the tie bars inserted through the movable die board is designed in the form of a ball screw shaft adapted to be threadably engaged with a ball nut member. As an electric motor installed on one of the stationary die boards is rotationally driven to rotate the ball nut members, the movable die board is slidably displaced toward or away from one of the stationary die boards. A rotary sleeve having a number of balls arranged on the inner peripheral surface thereof is received in a stationary case firmly fitted into the movable die board, and a rotational shaft designed in the form of a ball spline shaft is inserted through the movable die board so as to enable the movable die board to be displaced in the axial direction by engagement of the balls with a plurality of splines formed along the spline shaft. The ball nut members, the rotary sleeve, the rotational shaft and the electric motor are operatively connected to each other via rotational power transmission members each extending around these components. The rotational power transmitting member is usually designed in the form of a geared endless belt.