Turntable driving mechanism

摘要

A turntable drive mechanism for rotatably driving a turntable (13) disposed inside of a heating chamber (1) in a heating apparatus by utilizing a driving source (18) disposed outside of the heating chamber. The turntable driving mechanism comprises a driving axle (21) for transmitting a rotating torque from said driving source (18) to said turntable (13) via a wall portion of said heating chamber (1) and an axle receptor for rotatably securing said drive axle (21) to said wall portion. Furthermore, the inventive turntable driving mechanism comprises a air introduction means for forcedly generating an air flow processing from the outside of said heating chamber (1) to the inside thereof through a gap between said driving axle (21) and the axle receptor (40) maintaining an air flow from the outside to the inside of the heating apparatus through the gap and thereby preventing obstacles from flowing into the gap and residing therein.