Circuit for monitoring and controlling the flow of hot air in eq

Foods and beverages: apparatus – Subjecting food to an enclosed modified atmosphere – Automatic control or time means

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34 10, 34 57R, 993237, 99331, 99483, A47J 3142, A47J 4252, F26B 308, F26B 908

Patent

active

049496328

ABSTRACT:
A circuit permits of monitoring the temperature and the color of coffee in the drums of roasting equipment, and controlling the flow of hot air with dampers operated in pairs by respective stepping motors. The dampers are moved through a succession of proportioning positions in a definite sequence of two stages; an initial, continuous movement that approximates to the thermal transition required, followed by a series of discrete steps producing a fine adjustment; thus it becomes possible to ensure that the set pre-roast and roast temperatures are reached in the drums at the prescribed moment in time.

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patent: 4642906 (1987-02-01), Kaatze et al.
patent: 4748030 (1988-05-01), Illy
patent: 4813347 (1989-03-01), Yoshida

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