Ejector mechanism in an injection molding machine
US5196213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Nov 27, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/4005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An ejector mechanism which is simple in structure and facilitates the manufacture and assembling thereof, wherein a ball screw-spline shaft (10) of the ejector mechanism has a spline portion (11) fitted into a ball spline nut (20) fixed to a movable platen (1) of an injection molding machine, and a ball screw portion (12) threadedly engaged with a ball nut (30) which is rotatably supported by a casing (40) fixed to the movable platen. The ball nut is coupled to a motor (51) by toothed pulleys (52, 53) respectively secured to the ball nut and the output shaft of the motor, and a timing belt (54) looped round these pulleys. As the ball nut is rotated through motor rotation, the spline portion advances together with the ball screw portion, and a molded article is ejected by the distal end of the spline portion which acts as a molded article-ejecting portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.