Nozzle touch apparatus in an injection molding machine
US5147659A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | May 24, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1777
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A nozzle touch apparatus (5) for use in an injection molding machine, which is capable of automatically adjusting a nozzle touch force in a multi-stage fashion during execution of an injection molding cycle, having springs (56) each fitted on a guide rod (52) and disposed between a ball nut (54) and an extension portion (43) of an extruder base of an injection unit (4), the guide rod being formed integrally with the ball nut which is threadedly engaged with a ball screw (52) coupled to a servomotor (51) and inserted through a hole (43a) formed in the extension portion. The nozzle touch apparatus further includes a servo circuit (63) supplied with a signal from a strain gauge (61) provided on the extension portion and indicative of an actual nozzle touch force, and a signal supplied from a numerical control unit (64) and indicative of a predetermined nozzle touch force. The servo circuit is operable to drive the servomotor in accordance with a deviation between these signals to cause the guide rods to move, whereby the springs are brought into a compressed state in which the actual nozzle touch force consistent with the predetermined nozzle touch force is generated, the predetermine…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.