Provided is a paper feeding roll that is capable of reducing conveying noise and suppressing adhesion of paper dust. A paper feeding roll (10) is provided with: a shaft body (12); and an elastic body layer (14) that is formed on the outer circumference of the shaft body (12), wherein the elastic body layer (14) is a foamed body that contains hydrin rubber, and has a cavity (18) formed of foaming cells (16) being connected with one another is located radially inward of the elastic body layer (14). The average diameter of the foaming cells (16) located inward of the elastic body layer (14) in the radial direction is larger than the average diameter of the foaming cells (16) located outward in the radial direction. Recesses (20b) formed of foaming cells (16) being opened are provided to the outer circumferential surface (14b) of the elastic body layer (14).

A sheet conveyance device includes a driving rotation device, a driven rotation device, and a supporting device including first and second restriction surfaces and supporting the driven rotation device. The driving rotation device rotates by receiving rotational driving force and drives the driven rotation device to rotate at a position facing the driving rotation device. The driven rotation device includes a driven rotation member contacting the driving rotation device, a cylindrical shaft having a cylindrical shape that rotatably supports the driven rotation member, and a restriction member that is at least partially inserted in an inner circumference side of the cylindrical shaft. A position of the cylindrical shaft is restricted in a width direction crossing the sheet conveyance direction by the restriction member contacting the first restriction surface, and movement of the cylindrical shaft in a rotational direction is restricted by the restriction member contacting the second restriction surface.

To provide a rotating shaft with which flexibility of forming a bend is increased, and the strength is increased while reducing the amount of material. A V-shaped rotating shaft formed by bending sheet metal. An angle formed on an inner side of a bent portion is less than 90.

The present disclosure provides a drive transmission apparatus capable of reducing vibration of rotating member. The apparatus includes a shaft, a pin, and a rotating member. The rotating member is engaged with the shaft by the pin and rotates with the shaft. A protruded portion is provided on one of an outer circumferential surface of the shaft and an inner circumferential surface of the rotating member. The rotating member is attached to the shaft with the protruded portion in pressure contact with another one of the outer circumferential surface of the shaft and the inner circumferential surface of the rotating member, so that swinging of the rotating member around the pin is restricted.

A rotation drive device includes a driven rotation member, a driving rotation member, a rotation relay member, a shaft, and a holder. The rotation relay member transmits only a unidirectional rotational driving force from the driving rotation member to the driven rotation member. The rotation relay member includes a housing and a cylindrical one-way clutch. A contact portion between the driving rotation member and the shaft is configured to rotate the driving rotation member and the shaft to transmit the driving force to an inner peripheral side of the cylindrical one-way clutch via the shaft. The driving rotation member includes a boss projected toward the holder and rotatably held in the holder. A portion of the shaft to support the driving rotation member and an inner wall surface of a through hole of the driving rotation member are shaped to rotate the shaft and the driving rotation member. together.

A sheet conveyance device includes a driving rotation device, a driven rotation device, and a supporting device including first and second restriction surfaces and supporting the driven rotation device. The driving rotation device rotates by receiving rotational driving force and drives the driven rotation device to rotate at a position facing the driving rotation device. The driven rotation device includes a driven rotation member contacting the driving rotation device, a cylindrical shaft having a cylindrical shape that rotatably supports the driven rotation member, and a restriction member that is at least partially inserted in an inner circumference side of the cylindrical shaft. A position of the cylindrical shaft is restricted in a width direction crossing the sheet conveyance direction by the restriction member contacting the first restriction surface, and movement of the cylindrical shaft in a rotational direction is restricted by the restriction member contacting the second restriction surface.

A sheet supporting apparatus includes an apparatus body, a supporting unit being capable of being drawn from and inserted to the apparatus body, and having a supporting member on which a sheet is supported, a conveyance guide disposed on the apparatus body and being capable of moving to a first position at which a sheet conveyance path is constituted, and a second position distant from the first position, and a regulation unit. The regulation unit regulates the conveyance guide positioned at the second position from moving in an upward direction, a downward direction, a drawing direction and an inserting direction of a supporting unit.

A printing apparatus includes a printing portion for printing on a medium, a driving roller for transporting the medium, a first and a second driven roller which are respectively supported with a gap in one roller shaft in a shaft line direction of the roller shaft and rotate around the roller shaft while pressing the transported medium on the driving roller, and a shaft support member that has a shaft support portion which supports the roller shaft between the first driven roller and the second driven roller. The first and the second driven roller have a through hole into which the roller shaft is inserted and an inner diameter in a roller center portion is smaller than an inner diameter of a roller end portion in the shaft line direction. The roller shaft is supported so as to be swingable with the shaft support portion as a support point.

A sheet feeder includes: a sheet feeding assembly including: a shaft having an insertion part; and a feed roller; and a main body including: a rotary part; and first and second bearings. The main body supports the sheet feeding assembly. The rotary part rotates upon transmission of a drive force and receives the insertion part. The bearings support the shaft. An opening of an open portion of the first bearing has a circumferential dimension greater than a diameter of the shaft. The shaft supported by the bearings is movable between a mounted position and a retracted position. The feed roller is supported by the shaft, and movable as the shaft moves between the mounted position and the retracted position. The insertion part is separated from the rotary part when the shaft is in the retracted position, and inserted into the rotary part to place the shaft in the mounted position.

This disclosure provides a coupling device configured to couple a shaft and a rotating member supported on the shaft so as to be rotatable and demountable from the shaft including a contacting portion provided on a rotating member, and a restricting member provided on the shaft so as to be rotatable and configured to restrict a movement of the rotating member in the axial direction by coming into contact with the contacting portion.