Foods and beverages: apparatus – Cooking – Automatic control
Patent
1977-06-21
1979-10-16
McCarthy, Edward J.
Foods and beverages: apparatus
Cooking
Automatic control
99329RT, 99331, 99334, 219502, A47J 2700
Patent
active
041709322
ABSTRACT:
An electronic control for controlling the degree of toasting of a bread slice in a toaster. The control includes a thermocouple located within the passage of the toaster for the bread slice and responsive to the temperature of the toaster casing, the slice of bread and the air temperature within the passage to produce a voltage proportional to the resultant temperature. This voltage is integrated and actuates an electronic pulse generator with an adjustable pulse width which produces a triggering pulse. This pulse is used to actuate a solenoid which unlatches the support for the bread slice. The operational amplifier has a predetermined output voltage of reference defining the threshold of operation of the pulse generator. The electronic control is very stable and, therefore, produces uniform toasting, since it integrates the time required to obtain the desired degree of toasting as a function of the temperature variation to which the bread slice is subjected.
REFERENCES:
patent: 3229614 (1966-01-01), Matzenauer
patent: 3349692 (1967-10-01), Jones
patent: 3636858 (1972-01-01), Paaskesen
patent: 3956978 (1976-05-01), Borley
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