Protection system for part molding machines

Details Protection system for part molding machines Protection system for part molding machines

1979-11-19

1981-08-25

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Means responsive to abnormal condition completely stop...

264 401, B29F 114, B29F 100

Patent

active

042856493

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.

REFERENCES:
patent: 4023044 (1977-05-01), Miller

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