PURPOSE: To decrease the number of parts, to reduce sliding resistance, and to achieve fine adjustment of pressure by applying a structure of a lever in a pressure mechanism.

CONSTITUTION: A moment load due to pressure means 25, 26 of lever system that move along an arm member, is given to a work 9 through a fulcrum and a load shaft 13. As the moment load, based on the principle of lever, becomes the direct pressure to the work 9, by controlling moving patterns of the pressure means 25, 26, a desired pressure pattern, for example, to change the pressure from 0kgf to linear position along a time base, is implemented. As the position of the arm member corresponds to the thickness of the work, by detecting this position by a surveillance means, a fixed size, abnormality in thickness, failure in adhesion of the work, or consumption of a fixed disc can be detected directly.