G - Physics – 05 – D
Patent
G - Physics
05
D
341/34, 18/700
G05D 9/12 (2006.01) B29C 45/46 (2006.01) G05B 19/12 (2006.01)
Patent
CA 1080327
ABSTRACT OF THE DISCLOSURE An injection control apparatus for controlling the quantity of extrudable material dispensed by the screw of an extruder into a series of molds includes a code device attached to each mold or the mold carrier, the code device including magnets indicative of the volume of the mold cavity to be filled; sensors in the form of Hall effect switches for triggering by the magnets when in close proximity thereto and for generating a code signal which is fed to and stored in a controller; a rectilinear position transducer mechani- cally coupled to the screw of the extruder for sensing the position of the screw and producing a position signal; a logic circuit for receiving the code signal from the memory; potent- iometers for receiving a signal from the logic circuit and feeding a reference signal via the logic circuit to a null point detector for comparison with the position signal from the transducer to produce a command signal, which controls dispensing of extrudable material by the screw, i.e. the shot size. By employing only one comparator for a plurality of different shot sizes, the cost of control is drastically reduced.
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