Hot melt adhesive applicator and temperature control circuit the

Details Hot melt adhesive applicator and temperature control circuit the Hot melt adhesive applicator and temperature control circuit the

1987-06-26

1989-03-28

Paschall, M. H.

Electric heating

Heating devices

Tool or instrument

219501, 219497, 330298, 330275, 323236, 307540, H05B 102

Patent

active

048166421

ABSTRACT:
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 and a zero crossing detector for controlling the operation of a triac which, when turned on, increases the temperature at the applicator. The operational amplifier is protected by a clamping circuit from receiving a signal, when a temperature setting is changed from a high to a low setting, that would otherwise cause the differential amplifier to provide an output required for turning on the triac which would cause a run away condition to exist.

REFERENCES:
patent: 3588530 (1971-06-01), Largan
patent: 4096973 (1978-06-01), Checko
patent: 4119801 (1978-10-01), Jacobson
patent: 4345141 (1982-08-01), Little
patent: 4413255 (1983-11-01), Cohen et al.
patent: 4478181 (1984-10-01), Kikuchi et al.
patent: 4495405 (1985-01-01), Foster
patent: 4558286 (1985-12-01), Neidorff
patent: 4564749 (1986-01-01), Ishima
patent: 4626663 (1986-12-01), Tateda
IBM-Disclosure Bulletin--Differential Amplifier with Variable Clipping Levels--vol. 13 No. 9 (Feb-1971).
Zero Voltage Switches, CA3059, CA3079, 6 pages, 1977, Motorola Semiconductors, Phoenix, Ariz. 85036.

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