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In an injection molding machine, an apparatus for controlling movement of a pin comprising a plastic melt flow channel having an output end for delivering molten plastic injected into the channel under pressure to a mold cavity, wherein the pin comprises an elongated rod having an axis and an end, t

In an injection molding machine, an apparatus for controlling movement of a pin comprising a plastic melt flow channel having an output end for delivering molten plastic injected into the channel under pressure to a mold cavity, wherein the pin comprises an elongated rod having an axis and an end, the pin being slidably mounted within the channel for movement along its axis within the channel, an electrically driven motor drivably interconnected to an actuating mechanism, wherein the actuating mechanism is drivably interconnected to the end of the pin, the motor being controllably drivable to drive the pin through movement along its axis within the channel

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[ What is claimed is:] [1.]1. In a method for operating an injection molding machine having a plastic melt flow channel with a pin slidably mounted within the channel, wherein the channel has an output end for delivering molten plastic injected into the channel under pressure to a mold cavity, and w

[ What is claimed is:] [1.]1. In a method for operating an injection molding machine having a plastic melt flow channel with a pin slidably mounted within the channel, wherein the channel has an output end for delivering molten plastic injected into the channel under pressure to a mold cavity, and wherein the pin comprises an elongated rod having an axis and an end, the pin being slidably mounted for movement along its axis within the channel, a method for controllably driving movement of the pin along its axis comprising:drivably interconnecting a rotatable central rotor of an electrically driven motor to an actuating mechanism which is drivably movable along a predetermined path of travel;interconnecting the actuating mechanism to the end of the pin such that movement of the actuating mechanism along its predetermined path of travel simultaneously moves the pin along its axis according to a predetermined path of travel;controllably driving the motor to controllably drive the actuating mechanism and to controllably drive the pin through its predetermined path of travel within the channel. [12.]12. In an injection molding machine, an apparatus for controlling movement of a pin comprising:a plastic melt flow channel having an output end for delivering molten plastic injected into the channel under pressure to a mold cavity, wherein the pin comprises an elongated rod having an axis and an end, the pin being slidably mounted within the channel for movement along its axis within the channel,an electrically driven motor drivably interconnected to an actuating mechanism, wherein the actuating mechanism is drivably interconnected to the end of the pin, the motor being controllably drivable to drive the pin through movement along its axis within the channel.13. The apparatus of claim 12 wherein the motor includes a rotatably driven rotor which translates motion to the pin to drive the pin along its axis without rotation.14. The apparatus of claim 12 wherein the pin is subjected to forces along its axis and wherein the actuating mechanism is interconnected to the end of the pin such that the axial forces to which the pin is subjected are transmitted between the pin and the actuating mechanism without absorption of the axial forces.15. The apparatus of claim 12 wherein the motor includes a rotatably driven rotor having an axis and wherein the pin is subjected to forces along its axis, the apparatus further comprising a force absorbing member which absorbs forces transmitted to the rotor of the motor along its axis.16. The apparatus of claim 12 wherein the actuating mechanism comprises a screw and a complementary nut screwably engaged with each other, at least one of the screw and the nut being drivably interconnected to the motor to travel along a predetermined path of travel, the pin being simultaneously driven along its axis through a path of travel according to the predetermined path of travel of the screw or the nut.17. The apparatus of claim 14 wherein the actuating mechanism comprises a screw and a complementary nut screwably engaged with each other, at least one of the screw and the nut being drivably interconnected to the motor to travel along a predetermined path of travel, the pin being simultaneously driven along its axis through a path of travel according to the predetermined path of travel of the screw or the nut.18. The apparatus of claim 15 wherein the actuating mechanism comprises a screw and a complementary nut screwably engaged with each other, at least one of the screw and the nut being drivably interconnected to the motor to travel along a predetermined path of travel, the pin being simultaneously driven along its axis through a path of travel according to the predetermined path of travel of the screw or the nut.19. The apparatus of claim 12 wherein the motor is connected to a controller having a program for driving the movement of the actuating mechanism according to one or more sensed conditions of the molten plastic or the injection molding machine.