Patent ID: 7634211

Claim:
A temperature controlled roller system, comprising: a hollow roller having an annular interior space defined by a stationary axle on which the hollow roller is rotatably mounted by liquid tight bearings; a primary liquid circuit formed in the annular interior space of the roller and containing a first liquid; a secondary liquid circuit formed outside of the roller and containing a second liquid, the secondary liquid circuit being defined inside of a stationary part that is stationary relative to the frame, said secondary liquid circuit being enclosed in said stationary part so as to be separated from the roller; a heat exchanger arranged to bring the primary and secondary liquid circuits into thermal contact with one another, said heat exchanger comprising: a first heat exchange member that is in thermal contact with the primary liquid circuit and comprises a portion of the stationary axle that projects outwardly from the roller; and a second heat exchange member arranged on the stationary part to be in thermal contact with the secondary liquid circuit; and a temperature control device for controlling the temperature of the second liquid, wherein the first and second heat exchange members form heat transfer surfaces that are opposed to one another to permit heat transfer from one heat exchange member to the other heat exchange member.