SHEET CONVEYING ROLLER AND PRODUCTION METHOD THEREOF

摘要

The present invention provides a sheet conveying roller, which effectively reduces the amount of paper dust accumulated on its outer peripheral surface to thereby suppress sheet transportation failure. The sheet conveying roller includes a nonporous tubular elastic member (1). The elastic member (1) has a plurality of recesses (6) or a plurality of through-holes (8) equidistantly arranged in a center axis (L1) direction thereof and equidistantly arranged in a circumferential direction thereof, and each having an opening having a round plan shape in an outer peripheral surface (2) thereof, wherein the recesses (6) each have a constant depth as measured thicknesswise of the elastic member (1), wherein the through-holes (8) each extend thicknesswise through the elastic member (1). A production method includes forming the elastic member by vulcanizing a rubber composition in a vulcanization mold having projections corresponding to the recesses or the through-holes.

主权项

1. A method of producing a sheet conveying roller including a nonporous tubular elastic member having a plurality of columnar recesses in an outer peripheral surface thereof, the method comprising the steps of:
providing a vulcanization mold which includes an outer mold and an inner mold, the outer mold being circumferentially dividable into at least two mold pieces, and having a shape-imparting tubular inner surface corresponding to the outer peripheral surface of the elastic member, and a plurality of projections projecting radially inward from the shape-imparting inner surface and each having a sectional shape corresponding to a plan shape of the columnar recesses of the elastic member and a projection height corresponding to a depth of the columnar recesses as measured thicknesswise of the elastic member, the inner mold having a shape-imparting tubular outer surface to be located coaxially with the shape-imparting inner surface so as to be spaced a distance corresponding to a thickness of the elastic member from the shape-imparting inner surface; and forming the nonporous tubular elastic member with the plurality of recesses formed as corresponding to the projections in the outer peripheral surface thereof by preheating the vulcanization mold, locating the shape-imparting inner surface of the outer mold and the shape-imparting outer surface of the inner mold of the vulcanization mold coaxially with each other, filling a space defined between the shape-imparting inner surface and the shape-imparting outer surface with a rubber composition as a material for the elastic member, and vulcanizing the rubber composition.