Mold clamping unit and injection molding apparatus
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United States of America Patent
Stats
-
Nov 2, 2004
Grant Date -
Oct 31, 2002
app pub date -
Feb 19, 2002
filing date -
Feb 19, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mold clamping unit employed in an injection molding apparatus for opening and closing a mold having a movable mold plate and a fixed mold plate. The mold clamping unit comprises a mold clamping cylinder, mold opening means for applying a mold opening force of a predetermined magnitude to the movable mold plate in the direction from the closed position to the fully open position and moving the movable mold plate from the closed position to the predetermined half-open position located between the closed position and fully open position, and switching means for switching the mold clamping force generated by the mold clamping cylinder between the first mold clamping force which is larger than the mold opening force and a second mold clamping force which is smaller than the mold opening force by switching the supply pressure of working fluid supplied to the mold clamping cylinder. In such a configuration, special mold opening means for moving the movable mold plate from the closed position to the half-open position is provided separately in addition to the mold clamping cylinder. As a result, the movable mold plate can be accurately moved to the half-open position.
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