Paper feed roller

Abstract

A paper feed roller that can prevent paper sheet transport failure caused by accumulation of paper powder for a long period of time is provide. This paper feed roller includes a shaft body and an elastic body layer formed on the outer periphery of the shaft body. Unevenness are formed by protrusions on the circumferential surface of the elastic body layer. The protrusions are arranged on the circumferential surface of the elastic body layer in a direction different from an axial direction. The gap between a row of protrusions which extends in the direction different from the axial direction and a row of protrusions which is parallel to the row of protrusions is a continuous recess, i.e., a groove, and the width of the groove is greater than the distance between the protrusions in the row of protrusions which extends in the direction different from the axial direction.

1 . A paper feed roller comprising:
 a shaft body; and   an elastic body layer formed on an outer periphery of the shaft body,   wherein unevenness are formed by protrusions on a circumferential surface of the elastic body layer, and the protrusions are hemispherical protrusions,   wherein the protrusions are arranged on the circumferential surface of the elastic body layer in a direction different from a circumferential direction in an angle of ±10° or less with respect to the circumferential direction, and grooves that are continuous recesses are formed between rows of protrusions that extend in the direction different from the circumferential direction in the angle of ±10° or less with respect to the circumferential direction and rows of protrusions that are parallel to the rows of the protrusions,   the protrusions are arranged on the circumferential surface of the elastic body layer in a spiral shape,   a width of one of the grooves is larger than a protrusion separation distance in one row of protrusions, and the protrusion separation distance in the row of protrusions is in a range of 0 to 0.6 mm   the width of one of the grooves is in a range of 0.01 to 2.0 mm,   a height of one of the protrusions is in a range of 0.05 to 0.5 mm,   a curvature radius of one of the protrusions is in a range of 0.05 to 1.0 mm, and   a pitch of the grooves is in a range of 0.1 to 2.0 mm.