20100065544 | HAIR ROLLER HEATER - For controlling the heating of heating posts in a hair roller heater in which each heating post includes a respective resistive heating element, an emulator or physical model has a thermal time constant that is about equal to the time constant of each post assembly to emulate the thermal behaviour of the heating posts during both heating and cooling. Direct temperature feedback from the emulator to a thermostatic switch is used for controlling the current delivered to the heating elements. The emulator includes a pair of insulators between which a heating element is provided, one of the insulators being thermally coupled to a conductive mounting to which the posts are directly connected | 03-18-2010 |