Logic circuit for part detector

Details Logic circuit for part detector Logic circuit for part detector

1980-08-25

1982-08-31

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

29707, H02H 500

Patent

active

043475469

ABSTRACT:
Inspection apparatus is especially useful to verify the presence of metal parts such as pull tabs on can-production lines and to shut down lines not only if parts are missing or misplaced, but also if the sensors are shorted or the timer switch or circuit operation has otherwise been disturbed. Four stages of operation are coordinated with the mechanical progress of the machine, regardless of its speed of operation; these stages are the activating and deactivating of sensors (usually just before and just after a mechanical operation), then on switching a timing switch to low, and then on switching it back to high just before the sensors are again activated. At and after the stage of deactivation, the sensors are read for actual lack of signals, and latches of their signals during activation are also read to determine whether the parts were actually sensed. The signal to read is turned off when the timing switch goes high. Any concurrence of a read signal with a lack of latching or with the presence of a sensor signal indicates some problem of parts condition or of the circuit or timing switch; therefore on such concurrence the machine shuts down immediately.

REFERENCES:
patent: 4140072 (1979-02-01), Bartling et al.

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