Motor driven type die tightening apparatus for an injection molding machine
US5378141A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Aug 31, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1761
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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 membe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.