Patent ID: 8534670
Filing Date: 2013-09-17
Classification: B41J,B65H,F16C,G03G

Abstract:
1. A sheet conveying device, comprising: a pair of rollers including a first rotating shaft that is rotated by receiving power from a driving source, a driving roller that is fixed to the first rotating shaft, a driven roller that faces and is pressed against the driving roller so as to be driven to rotate, and a second rotating shaft that supports the driven roller, the sheet conveying device conveying a sheet by passing the sheet through the pair of rollers being rotated, wherein: the driving roller includes a roller core and a peripheral member, the peripheral member includes a cylindrical center portion applying a conveying force to the sheet to move the sheet forward and end portions located at both ends of the center portion and having an approximately circular truncated cone shape, the roller core has a first portion and a second portion along an axis direction, the center portion of the peripheral member is held around the first portion of the roller core, the roller core and the peripheral member are separable from each other, surfaces of the center portion and at least one of the end portions are made of an elastic material, the driving roller further includes a hollow portion, in which the at least one of the end portions is elastically deformed, is formed between the second portion of the roller core and at least one of the end portions of the peripheral member, an outer surface of the center portion is matched with outer surfaces of one end of the end portions, and a diameter of another end of the end portions is larger than a diameter of the one end of the end portions, a material, a diameter, and a thickness of the end portions are configured such that when a thin paper passes through the pair of rollers, the sheet is deformed into a wave-like form in accordance with a form of the end portions, and, when a thick paper passes through the pair of rollers, parts of the end portions are deformed due to the stiffness of the sheet and the sheet being approximately flat, the first portion of the roller core has a recess recessed from an outer periphery of the first portion along the axis direction, the center portion of the peripheral member has a protrusion protruding from an inner periphery of the center portion along the axis direction, and the protrusion is lightly fitted to the recess to hold the center portion of the peripheral member around the first portion of the roller core.