Wax applicator with electronic control

Coating implements with material supply – With means to impart heat to material

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Details

219421, 219425, 2221465, 401208, B05C 1702, B42C 900

Patent

active

048894400

ABSTRACT:
The disclosed roller applicator, for applying a coating of molten wax or the like on paper or the like, has a bowl in which wax is melted and heated to a high working temperature by an electrical heating resistor under the thermal control of a first thermistor, directly in series with the resistor across AC power conductors. The thermistor, when heated to the working temperature, makes a transition between a low resistance state and a disproportionately higher resistance state, for greatly reducing the resistor current. An additional resistor, in parallel with the thermistor, bypasses a small keep-warm current through the heating resistor for maintaining the high working temperature. The increased voltage drop across the thermistor is supplied to one input of an operational amplifier, employed as an electronic switch to energize a first LED, signaling "ready". A second thermistor, positioned so that the degree of immersion thereof in the molten wax decreases as the wax level drops, cools off and makes a transition between high resistance and low resistance states. This transition is translated into a magnitude change of electrical pulses supplied to a second operational amplifier for energizing a second LED, indicating "low wax", but such energization is initially disabled by a nonconductive series transistor, which is later rendered conductive by the output of the first operational amplifier. A third LED is energized whenever the electrical power is on.

REFERENCES:
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patent: 3430816 (1969-03-01), Nadherny et al.
patent: 3485417 (1969-12-01), Cocks
patent: 4006895 (1977-02-01), Scholl et al.
patent: 4032046 (1977-06-01), Elliott et al.
patent: 4065214 (1977-12-01), Daum et al.
patent: 4278872 (1981-07-01), Koether et al.
patent: 4413255 (1983-11-01), Cohen et al.
patent: 4432715 (1984-02-01), Ghim
patent: 4639611 (1987-01-01), Sticher
patent: 4744688 (1988-05-01), Silber
patent: 4773784 (1988-09-01), Mann
Designing with Operational Amplifiers by J. R. Graeme, pp. 57 & 62, 1977.
Publication entitled Series 662 Disc PTC Thermistors, Mepco/Electra, Inc., Columbia Road, Morristown, NJ 07960, pp. 582 and 583.

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