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1. EP1102670 - ACTUATOR FOR INJECTION MOLDING VALVE GATE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. A valve (10) for controlling the flow of fluent plastic material to a mold cavity (4), wherein the valve comprises a valve actuator housing (12) having a material inlet (32) and a material outlet (17); an elongated valve pin (38) axially slidably carried within the valve actuactor housing (12), the valve pin (38) having an end (40) adjacent the material outlet (17) and adapted to be engaged selectively with the outlet (17) to prevent flow of material through the valve and to be disengaged selectively from the material outlet (17) to permit flow of material through the valve; a valve pin guide (36) comprised in the valve actuator housing (12) and having an opening for slidably receiving the elongated valve pin (38) for reciprocating axial movement; and a valve pin actuator including a rotatable cam (60) that cooperates with the valve pin (38) at a position spaced from the end (40) adjacent the outlet (17), for moving the valve pin (38) in a direction parallel to the axis of the valve pin (38) toward and away from the material outlet (17); the valve pin (38) further comprises a valve pin drive member (42) spaced axially along the valve pin (38) from the end adjacent the outlet (17), characterised in that the rotable cam (60) is disposed within the valve pin drive member (42) and the valve drive member (42) is slidably supported within the valve housing (12) for linear movement in a direction parallel to the axis of the valve pin (38) and restrained by the valve pin guide (36) from movement in a direction transverse to the axis of the valve pin (38).
  2. A valve (10) in accordance with claim 1, characterized in that the valve pin drive member (42) includes a passageway (51) extending transversely to the axis of the valve pin (38).
  3. A valve (10) in accordance with claim 2, characterized in that the valve further includes a cam follower block (56) slidably carried in the passageway (51) of the valve pin drive member (42) for movement transverse to the axis of the valve pin (38), the cam follower block (56) including an interior cam follower surface (58) for receiving and engaging an outer surface of the cam (60).
  4. A valve (10) in accordance with any one of claims 1 to 3, characterized in that the rotatable cam (60) comprises an eccentric camshaft (18) rotatably supported in the housing (12) and having its axis extending transversely to the axis of the valve pin (38).
  5. A valve (10) in accordance with any one of claims 1 to 3, characterized in that the housing (12) includes guide surfaces (44,46,48,50) that extend parallel to the axis of the valve pin (38) for guiding the valve pin drive member (42) as it moves toward and away from the material outlet (17).
  6. A valve (10) in accordance with claim 3, characterized in that the cam (60) is engaged with the cam follower block (56) for moving the valve pin drive member (42) in a first direction and in a second direction that is opposite from the first direction.