H - Electricity – 05 – B
Patent
H - Electricity
05
B
341/15.2
H05B 1/02 (2006.01) B05C 11/10 (2006.01) G05D 23/24 (2006.01)
Patent
CA 1301284
Abstract of the Disclosure A hot melt adhesive applicator operable at a number of selected temperatures having a portion of the circuitry for control of the applicator temperature at a point remote from the applicator body. The remotely located circuitry employs a differential amplifier (39) and a zero crossing detector (38) for controlling the operation of a triac (41) which, when turned on, increases the temperature at the applicator. The differential amplifier (39) is protected by a clamping circuit (66-6n) from receiving a signal, when a temperature setting is changed from a high to a low setting, that would otherwise cause the differential amplifier (39) to provide an output required for turning on the triac (41) which would cause a run away condition to exist.
567606
Minnesota Mining And Manufacturing Company
Smart & Biggar
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