Seal wire heat control system

Details Seal wire heat control system Seal wire heat control system

1993-06-02

1994-06-14

Paschall, Mark H.

Electric heating

Heating devices

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

219508, 219493, 219505, 156515, 1565839, 533737, H05B 102

Patent

active

053212304

ABSTRACT:
A seal wire heat control system adapted to record in memory the immediate history of the operation of the seal wire and to adjust the time duration of the application of voltage to the seal wire in accordance with a predetermined program. The application of heat is controlled according to the running history of the machine. At start up, a relatively long pulse of power is sent through the wire to make a seal for a predetermined number of times. When the count is reached, an intermediate pulse is provided to the wire for a predetermined number of times. When this count is reached, a short pulse is provided to the wire. A reset timer monitors idle time. If no seal is executed after a predetermined time, the entire system, including counters, resets to prepare for delivery of a long pulse to the wire. A safety timer is also provided for limiting the duration of power to the wire within the wire's safety threshold value.

REFERENCES:
patent: Re30010 (1979-05-01), Shanklin
patent: 3490981 (1970-01-01), Shanklin
patent: 3679518 (1972-07-01), Andler et al.
patent: 4219988 (1980-09-01), Shanklin et al.
patent: 4377738 (1983-03-01), Berg
patent: 4464219 (1984-08-01), Colombo et al.
patent: 4506146 (1985-03-01), Rice
patent: 4512138 (1985-04-01), Greenawalt

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