Safety circuit for a potentially dangerous machine monitored by

Details Safety circuit for a potentially dangerous machine monitored by Safety circuit for a potentially dangerous machine monitored by

1979-06-29

1981-09-22

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361192, 307326, 100 53, G01R 3100, H01H 4900

Patent

active

042913594

ABSTRACT:
A safety circuit for a potentially dangerous machine monitored by light and which works in an operating cycle. A safety circuit is described which utilizes a series of relays each of which is switched from an energized to a de-energized condition once during each working cycle of the machine so that each of the relay contact also opens and closes during the working cycle. In this way each relay contact is tested. The relays are so interconnected that if one contact should stick it will interrupt the sequence and will ensure the potentially dangerous machine e.g. a press is rendered inactive. Circuits are given for both hand fed and automatic machines which are monitored by a light barrier or curtain. For the hand fed machine the cycle is initiated by the operator reaching through the light barrier to insert an object into the machine. For an automatically fed machine the test cycle is initiated by a switch automatically activated once per cycle.

REFERENCES:
patent: 2241556 (1941-05-01), MacMillin et al.
patent: 3858095 (1974-12-01), Friemann et al.
patent: 3866004 (1975-02-01), Nawrocki
patent: 3911344 (1975-10-01), Svenson
patent: 3950755 (1976-04-01), Westbrook et al.
patent: 4072222 (1978-02-01), Coon

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