Actuator for injection molding valve gate

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/23 (2006.01)

Patent

CA 2347023

A valve (10) for controlling the flow of fluent plastic material from an injection molding machine to a mold cavity. The valve includes an axially slidable valve pin (38) that interacts with a material outlet (17) to control flow through the valve selectively. The valve pin is actuated by an eccentric cam arrangement (60) that positively drives the valve pin between positions where it is engaged with or disengaged from the material outlet. The cam acts on the valve pin only in an axial direction to avoid wear occasioned by side loads imposed on a valve pin.

L'invention concerne un obturateur (10) servant à régler le flux de matière plastique s'écoulant d'une machine de moulage par injection vers une cavité de moule. L'obturateur comporte une tige d'obturateur coulissant dans le sens axial (38), qui interagit avec un orifice de sortie de matière (17) de façon à régler de manière sélective l'écoulement à travers l'obturateur. La tige d'obturateur est actionnée par un dispositif de came excentrique (60) qui entraîne directement la tige d'obturateur dans des positions d'engagement ou de désengagement de l'orifice de sortie de matière. La came n'agit sur la tige d'obturateur que dans un sens axial afin d'éviter une usure provoquée par des charges latérales sur la tige d'obturateur.

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