Mold clear detector

摘要

An apparatus for detecting the retention of non-ejected parts in the cavity of a plastic molding machine and inhibiting the operation of the molding machine in response thereto. The apparatus employs a set of photocells coupled via associated fiber optic cables to a comparator. The retention of a molded part subsequent to the completion of a molding cycle is indicated by the interruption of a light beam generated by at least one of the photocells. The optical signal is processed by the comparator and associated circuitry so as to activate a mold inhibiting relay.