Patent ID: 8020398

Claim:
A mechanism for maintaining a workpiece at a desired temperature, comprising: a. a platen upon which said workpiece is positioned, having a conduit therein; b. a first fluid delivery mechanism, comprising: i. a hollow cylinder having a closed end and an open end; ii. a tube, having a proximate end positioned within said cylinder, a distal end extending from said open end of said cylinder, and a first conduit between said proximate and distal ends, wherein said first conduit is in fluid communication with said conduit in said platen; iii. a first sealing element located within said cylinder, and positioned between an outer surface of said tube and an inner surface of said cylinder, such that said tube can move relative to said cylinder and said first sealing element and wherein the volume within said cylinder between said closed end and said first sealing element defines a first chamber wherein said proximate end of said tube is located in said first chamber; and iv. a fluid passageway in communication with said first chamber and an outer surface of said cylinder, adapted to supply or remove fluid into said first chamber.