Patent ID: 7392743
Filing Date: 2008-07-01
Classification: B65H,G07D

Abstract:
1. A thickness detecting apparatus comprising a cylindrical stationary rotary body and a cylindrical displaceable rotary body which are opposed to each other, for detecting a thickness of a sheet or the like, depending upon a displacement by which the displaceable rotary body displaces away from the stationary rotary body when the sheet or the like to be transferred passes through between both stationary rotary body and displaceable rotary body, wherein a center of a load caused when the displaceable rotary body presses the sheet or the like is biased from a center of the displaceable rotary body in one of center axial directions, wherein the displaceable rotary body is composed of a cylindrical sheathing formed of an undeformable member, a core shaft therein and an elastic member interposed between the sheathing and the core shaft, a center of an urging force for urging the inner surface of the sheathing is biased in one of the center axial directions from a center of the displaceable rotary body so as to bias the center of the load, and wherein the elastic member is composed of plural kinds of members having different resilient forces, those of which have strong resilient forces being biased in one of the center axial directions.