Patent ID: 6752306
Filing Date: 2004-06-22
Classification: F16C,G11B,Y10S

Abstract:
A pinch roller apparatus comprising:a pinch roller shaft having one end fixed to an arm; a plain bearing having a longitudinal center and forming a hollow cylindrical body extending along a central axis between a radially-extending upper end surface and an opposite radially-extending lower end surface each one of the upper and lower end surfaces formed with an annularly-shaped recess encircling the central axis and tapering inwardly relative to the longitudinal center of the plain bearing as the recess extends radially outwardly relative to the central axis; a pinch roller main body provided with a rubber elastic body on an outer periphery of a sleeve, said pinch roller main body being mounted to the pinch roller shaft via the plain bearing; a first circular sliding plate mounted to and extending radially from the pinch roller shaft; a second circular sliding plate mounted to and extending radially from the pinch roller shaft; and said pinch roller main body being pressed to a capstan by moving said arm, wherein the first circular sliding plate operative to enter the annularly-shaped recess to be brought into contact with the upper end surface and the second circular sliding plate operative to enter the annularly-shaped recess to be brought into contact with the lower end surface of said plain bearing mounted to said pinch roller shaft, wherein when setting a length of an axial gap between the circular sliding plate brought into contact with the upper end surface of the plain bearing and the plain bearing to A and a length of an outer diameter of the circular sliding plate to B, the structure is made such as to satisfy a relation 0.007&lE;A/B&lE;0.006.