Conveying roller unit, sheet conveying device, and image processing apparatus

A conveying roller unit comprising:

• a support member formed in a cylindrical shape having an internal space, and including an outer peripheral portion on which a roller member is provided;
• a first rotation shaft portion provided at a first side surface of the support member at one side in an axial direction thereof and having a cylindrical shape including a tubular space therein forming a part of the internal space;
• a second rotation shaft portion having one end portion inserted from a second side surface of the support member at another side in the axial direction through the internal space of the support member into the tubular space of the first rotation shaft portion, and another end portion protruding from the second side surface of the support member, the second rotation shaft portion being supported by the support member so as to be slidable in the axial direction;
• and
• a biasing member provided from the one end portion side to the tubular space side in the internal space and configured to bias the second rotation shaft portion along the axial direction toward the other end side, wherein
• the one end portion of the second rotation shaft portion includes a tubular storage portion configured to be able to store the biasing member therein,
• the tubular storage portion includes, at a part of a circumferential surface thereof, an engagement piece extending in the axial direction,
• the engagement piece includes, at a leading end thereof, a claw portion protruding outward from the circumferential surface, and is configured to be elastically deformable in a retraction direction in which the claw portion is retracted from the circumferential surface toward an inner side,
• the first rotation shaft portion has, in a circumferential surface thereof, a slit which extends in the axial direction and with which the claw portion is engageable, and
• the engagement piece is configured to be brought into contact with a side surface of the biasing member at an engagement position where the claw portion is engaged with an end portion of the slit at the base end portion side, by a biasing force of the biasing member, whereby elastic deformation of the engagement piece in the retraction direction is prevented.