Thickness detecting apparatus

Abstract

There are provided a thickness detecting apparatus which can restrain erroneous detection even though a sheet or the like overlaps with only a part of a rotary body, and, which can enhance the degree of accuracy of detection, comprising a cylindrical displaceable rotary body and a cylindrical stationary rotary body which are opposed to each other, the thickness detecting apparatus detecting a thickness of the sheet or the like to be transferred in accordance with a displacement by which the displaceable rotary body is separated from the stationary rotary body, when the sheet or the like passes through between the displaceable rotary body and the stationary rotary body, and the center of a load with which the displaceable rotary body presses the sheet or the like is biased from the center of the displaceable rotary body in one of center axial direction.

1 . A thickness detecting apparatus comprising a plurality of cylindrical stationary rotary bodies and a plurality of cylindrical displaceable rotary bodies which are provided opposed to each other on a transfer pass transferring a sheet or the like, for detecting a thickness of the 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 bodies and displaceable rotary bodies, wherein a center of a load caused when the plurality of displaceable rotary bodies press the sheet or the like is biased from a center of each of the displaceable rotary bodies to a center of the transfer pass in a width direction perpendicular to a transferring direction of the transfer pass. 
   
   
       2 . A thickness detecting apparatus as set forth in  claim 1 , 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, and
 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.   
   
   
       3 . A thickness detecting apparatus as set forth in  claim 2 , wherein the elastic member is formed so as to have a surface through which the elastic member makes contact with an inner surface of the sheathing is ununiformly biased in one of the axial directions. 
   
   
       4 - 6 . (canceled)