Conveying roller, and feeding unit and image forming apparatus provided therewith

A conveying roller mountably/dismountably supported on a mounting portion, the conveying roller comprising:

• a rotary shaft portion which is extendable/contractible;
• a roller supporting member in a cylindrical shape including an outer circumferential surface with an interior space;
• and
• a roller member supported on the outer circumferential surface, the roller member conveying a sheet by rotating while in contact with the sheet,
• wherein
• the roller supporting member includes a first side surface including an opening through which the interior space is open, and a second side surface arranged opposite to the first side surface,
• the rotary shaft portion includes a first shaft arranged at the first side surface, and a second shaft arranged at the second side surface,
• the first shaft includes one end part thereof inserted into the interior space through the opening of the first side surface, and is movable in an axial direction relative to the first side surface, and
• the first shaft includes a regulating portion which is arranged on an outer circumferential surface thereof and which is displaceable between a permitting position in which the regulating portion permits, as the first shaft moves in an insertion direction relative to the roller supporting member, movement of the first shaft in the insertion direction without interfering with a rim of the opening and a restricting position in which the regulating portion restricts the movement of the first shaft in the insertion direction relative to the roller supporting member by interfering with the rim.