Power supply for binding apparatus

Details Power supply for binding apparatus Power supply for binding apparatus

1991-06-14

1993-10-26

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219518, 219497, 412 33, 412901, 1565839, H05B 102

Patent

active

052568598

ABSTRACT:
A control circuit for a binding apparatus using a binder covers having resistance heating strips in a heat activated adhesive includes a power control to output a constant power to the heating strip. A duty cycle of the power signal supplied to the heating strip is controlled dependent upon the resistance of the strip. Fault detection circuitry indicates an open circuit in the resistance strip and interrupts the power supply. A stress test is performed by a high voltage generator which emits a high voltage pulse at the start of the binding cycle to stress the connections in the binder cover and thereby cause failure of any weak connections before the binding cycle is underway. A timer circuit is also disclosed.

REFERENCES:
patent: 2644151 (1953-06-01), Krueger
patent: 4367116 (1983-01-01), Wilholm
patent: 4378266 (1983-03-01), Gerken
patent: 4506144 (1985-03-01), Hesford
patent: 4855573 (1989-08-01), Vercillo et al.

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