Toggle type mold clamping apparatus in an injection molding machine
US4938682A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Mar 30, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/661
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mold clamping apparatus of an injection molding machine is provided, which is capable of uniformly applying a pressing force to a movable platen. A pair of annular wedge type connection members (21, 22) are disposed within annular hollow portions (16a) of driving pulleys (16), which are respectively fitted on ball screws (14, 15) threadedly engaged with heads of upper and lower toggle sections disposed symmetrically with respect to an axis of the mold clamping apparatus. To make an adjustment for eliminating mismatch between operational phases of the toggle sections of the toggle mechanism due to flexure of the same mechanism, an urged contact state of the connection member is released by loosening bolts (23), and the ball screws, rendered to be rotatable relative to the driving pulleys, are manually rotated so that the heads are aligned with each other. After completion of the adjustment, the driving pulleys are again rendered rotatable in unison with the ball screws. The heads then are moved through the ball screws toward the movable platen, and links of the toggle sections for generation of the pressing force are gradually expanded. Since the operational phases of the toggle s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.