Claims
- 1. 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; and a 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.
- 2. The machine of claim 1, wherein the pressure regulating device is an electrically modulated pressure control valve.
- 3. The machine of claim 1, including a position logic device located in said fluid line for the movement of said movable die section, wherein said position logic device comprises one of a directional valve and a switchable cartridge valve bridge with two-way valve inserts.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 03 760 |
Feb 1993 |
DE |
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Parent Case Info
This is a continuation of application Ser. No. 08/192,717, filed Feb. 7, 1994 now U.S. Pat. No. 5,529,478.
US Referenced Citations (7)
Foreign Referenced Citations (3)
Number |
Date |
Country |
499 824 |
Jan 1971 |
CH |
29 02 264 |
Jul 1980 |
DE |
0 097 275 |
Jan 1984 |
EP |
Non-Patent Literature Citations (1)
Entry |
Backe, Fluidtechnische Realisierung Ungleichmassiger Periodischer Bewegungen, Olhydraulic Und Pneumatik, at (May 22, 1987). |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/192717 |
Feb 1994 |
US |
Child |
08/574358 |
|
US |