Title:
TOGGLE TYPE MOLD CLAMPING APPARATUS FOR ELECTRIC INJECTION MOLDING MACHINE
Document Type and Number:
WIPO Patent Application WO/1990/002033
Kind Code:
A1
Abstract:
This invention relates to a mold clamping apparatus for an electric injection molding machine which can eliminate deflection of a toggle mechanism and non-uniformity of a push force applied to a movable platen resulting from the former, can be produced at a low cost and has excellent operation response. The mold clamping apparatus (1) is equipped with upper and lower toggle portions (6, 7) including ball screws (61, 71) disposed symmetrically with each other and outwardly in a radial direction with respect to the axis of the apparatus, heads (62, 72) meshing with the ball screws and links (63 ~ 65, 73 ~ 75) expanding and contracting with reciprocation of the heads along the ball screws, and each ball screw is connected directly to the output shaft of corresponding one of two servo motors (8, 9) connected to a control circuit (20) containing a pulse width modulation control circuit and two transistor inverters. Principal constituent components of the mold clamping apparatus are spaced apart from the axis and deflection of the toggle mechanism (6, 7) and non-uniformity of a push force applied to the movable platen (5) due to deflection can be eliminated. Since each servomotor may be of compact type that can drive only one toggle portion, the mold clamping apparatus is economical and has high operation response.
Inventors:
INABA YOSHIHARU (JP)
YAMAMURA MASATO (JP)
YAMAMURA MASATO (JP)
Application Number:
PCT/JP1989/000770
Publication Date:
March 08, 1990
Filing Date:
July 27, 1989
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
B22D17/26; B29C33/22; B29C45/66; B30B1/10; (IPC1-7): B29C45/66
Foreign References:
| JPS636825U | 1988-01-18 | |||
| JPS6287813U | 1987-06-04 |
Other References:
See also references of EP 0383935A4
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