Power switch control apparatus of equipment

Details Power switch control apparatus of equipment Power switch control apparatus of equipment

1995-12-26

1997-11-25

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307142, H01H 4700

Patent

active

056918747

ABSTRACT:
When the user depresses a soft key SW in an on-state of a door switch DSW in which a door is closed, a transistor Tr1 is turned on, a transistor Tr4 is turned on, a relay RL1 is turned on, and an AC power source is supplied to an image forming apparatus. When a jam occurs, a CPU 2 turns on a transistor Tr5 for a predetermined time and a latching relay RL2 is driven to the holding side. When the door is opened for a jam process, the door switch DSW is opened and the AC power drops. When the door is closed after the jam process, the door switch DSW is closed. In this instance, since the latching relay RL2 is in a holding state, the AC power is again supplied in a manner similar to the case where the soft key SW is depressed. When the jam cancellation is confirmed, the holding of the latching relay RL2 is cancelled and the ordinary operation is started.

REFERENCES:
patent: 4533810 (1985-08-01), Harmon et al.
patent: 4787008 (1988-11-01), Graff et al.
patent: 4811051 (1989-03-01), Masuda et al.
patent: 5077631 (1991-12-01), Cleary
patent: 5147448 (1992-09-01), Lang
patent: 5448338 (1995-09-01), Masuda et al.

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