| 摘要 |
A plastic melt temperature control for use with a plastic injection molding machine having a heated barrel, a reciprocating and rotating screw within the barrel and a hydraulic or similar system for applying pressure to the back of the screw, and electrical controls for the barrel heaters, the screw speed and the pressure system provides for the automatic adjustment of the temperature of the plastic. A pulse generator selectively applies pulses to three independent reversing counters, one counter for each of the functions controlled. The contents of each counter is proportional to the quantity of power derived from a power source to control each of the functions. Logic circuitry provides selective choice of counters the contents of which are to be increased or decreased in order to change the temperature of the plastic melt when required.
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