Patent ID: 6179600
Filing Date: 2001-01-30
Classification: B29C

Abstract:
An injection molding machine having a movable die section therein, comprising:a stationary cylinder and a piston slidably received in said cylinder and being connected to said movable die section;a pressurized fluid source;a port in said cylinder connected to the pressurized fluid source via a fluid line for admitting fluid under pressure into said cylinder on one side of said piston; anda controller for controlling the pressure of the fluid in said fluid line, said controller including a sensor for sensing at least a portion of at least one of a time function, a velocity profile and a position profile of said movable die section at all times during movement of said movable die section between first and second positions and producing an output signal indicative thereof, wherein at said first position said movable die section is operably arranged with a second die section for formation of an injection molded product, wherein at said second position said movable die section is spaced from the second die section for molded product ejection, wherein said output signal is fed into a comparator for comparing said output signal to a control parameter, said comparator outputting a control signal to a pressure regulating device in said fluid line for controlling the pressure of fluid entering said port, and hence directly controlling the acceleration of said movable die section at all times during movement of said movable die section between said first and second positions.