Patent ID: 8282099

Claim:
A sheet delivery mechanism, comprising: a first roll having an outer periphery; a second roll which delivers the sheet with the first roll; and wherein the first roll is provided with a plurality of convexes formed on the outer periphery circumferentially for pushing a rear end of the sheet to be delivered, each of the plurality of convexes includes a curved radial tip portion, a tapered shape extending directly from the radial tip portion in an upstream direction with respect to a rotating direction of the first roll, and a face being a portion of the convex directly downstream in the rotating direction than the radial tip portion; the tapered shape of one of the plurality of convexes is more inside radially than a line which is drawn from the radial tip portion of an adjacent convex of the plurality of convexes, which is upstream with respect to the rotating direction of the first roll, toward the one of the plurality of convexes so that the line has a gradient that is equal to the tapered shape of the one of the plurality of convexes, a peripheral surface of the tapered shape of the one of the plurality of convexes is approximately equal to a tangential line drawn from the radial tip portion of the one of the plurality of convexes to the upstream direction of the outer periphery of the first roll, and the face has a gradient having an angle with respect to the outer periphery of the first roll that is larger than an angle of the tapered shape with respect to the outer periphery of the first roll.