US 4,285,649 AGranted

Protection system for part molding machines

OwnerPatrick B. Jonte, John K. Bienerinventors

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Abstract

A protection system for monitoring the operation of a part molding machine which ejects the part from the molds after successful completion of the molding process. A plate is disposed beneath the mold for receiving the parts after they are ejected. A transducer mounted on the plate provides a spectrum of signals having different frequencies when the part impacts the plate. The amplitude of these signals at particular frequencies depend upon the part being made by the machine. A frequency generator is used to selectively provide a reference frequency signal associated with the particular part being made. A tone decoder compares the reference frequency signal with the signals from the transducer and provides an output signal if the amplitude of the transducer signals at the reference frequency exceeds a predetermined level. If the output signal from the tone decoder is not generated further operational cycles of the machine are prevented thereby protecting the mold from being damaged by a part which has not been fully ejected.

Claims17

Dependent claims

A protection system for monitoring the operation of a part molding machine which ejects the part from the molds after successful completion of the molding process, said system comprising:

a plate for receiving the parts after they are ejected from the molds;
transducer means coupled to the plate, operative to provide a spectrum of signals having different frequencies and amplitudes upon detection of a part impacting said plate, the amplitude of said signals at particular frequencies depending upon the characteristics of the parts being made by the machine;
selector means for generating a selected frequency signal associated with the parts currently being made by the machine;
comparison means for comparing said selected frequency with the signals from the transducer means, operative to provide an output signal if the amplitude of the transducer signals at the selected frequency exceeds a predetermined level;
and
control means for preventing further operation cycles of the machine if said output signal is not generated thereby protecting the molds from being damaged by a part which has not been fully ejected.

3 more elements

Dependencies are inferred from the claim text.