Regulation of wisking of a food substance

Abstract

A machine has a tank having a cavity for containing and processing a batch of liquid food substance; a stirring tool in the cavity having a stirring surface for imparting a mechanical effect on said food substance in the cavity to froth the food substance; an actuator configured to rotate the stirring tool in the cavity; and a control unit configured to control the actuator so that the rotational speed of the stirring tool is changeable. The control unit has a mode in which the actuator is controlled by the control unit so that: during a first phase of processing the batch, the stirring tool is rotated below a low frothing rotational speed; and thereafter during a second phase of processing said batch, the rotational speed of the stirring tool is increased from the low frothing rotational speed to above a high frothing rotational speed; and thereafter during a third phase of processing said batch, the stirring tool is rotated above the high frothing rotational speed.

Dependencies are inferred from the claim text.