| 主权项 |
1. A sheet feeder comprising:
a sheet feeding assembly comprising:
a shaft configured to rotate about a rotation axis extending in an axial direction, the shaft having one end portion and another end portion in the axial direction, the one end portion having an insertion part, the insertion part including a prescribed surface and a circumferential surface, the prescribed surface crossing in a radial direction of the shaft, the prescribed surface having one end extending in the axial direction and another end extending in the axial direction, the circumferential surface extending in a circumferential direction of the shaft from the one end of the prescribed surface and the another end of the prescribed surface, a distance in the radial direction from the rotation axis to a portion of the prescribed surface except for the one end of the prescribed surface and the another end of the prescribed surface being smaller than a distance in the radial direction from the rotation axis to the circumferential surface;a feed roller supported by the shaft and configured to rotate in a sheet-feeding direction;a lever disposed at the another end portion of the shaft, the feed roller being positioned between the insertion part and the lever in the axial direction, the lever including a grip part extending in the radial direction; anda first one-way clutch allowing the lever to idly rotate relative to the shaft in a sheet-returning direction opposite to the sheet-feeding direction; and a main body supporting the sheet feeding assembly, the main body comprising:
a reverse roller facing the feed roller and configured to rotate in the sheet-returning direction;a first contact part positioned downstream relative to the grip part in the sheet-returning direction and contacting the grip part;a rotary part configured to rotate about the rotation axis upon transmission of a drive force, the rotary part including a hole portion and a first wall, the hole portion being configured to receive the insertion part, the first wall being configured to contact the prescribed surface but to be separated from the circumferential surface when the insertion part has been inserted into the hole portion, the rotary part having one end and another end in the axial direction, the one end of the rotary part being closer to the feed roller than the another end of the rotary part to the feed roller in the axial direction;a first bearing disposed between the feed roller and the rotary part in the axial direction, the first bearing including an open portion having an inner curved surface on which the shaft is rotatably supported, an opening of the open portion having a dimension in the circumferential direction greater than an outer diameter of the shaft;a second bearing disposed opposite to the first bearing and the rotary part with respect to the feed roller in the axial direction, the second bearing supporting the shaft at a position between the feed roller and the lever, the shaft being slidable in the axial direction relative to the second bearing; andan indentation wall disposed opposite to the feed roller with respect to the second bearing in the axial direction, the indentation wall being indented in the radial direction and extending in the axial direction, the indentation wall having one end and another end in the axial direction, the one end of the indentation wall being farther from the feed roller than the another end of the indentation wall from the feed roller in the axial direction, a distance from the one end of the indentation wall to the one end of the rotary part being greater than a dimension of the shaft in the axial direction, wherein the shaft is configured to be slidingly movable in the axial direction between a mounted position and a retracted position while the shaft is supported by the fist bearing and the second bearing, the feed roller and the lever moving in the axial direction in conjunction with the sliding movement of the shaft between the mounted position and the retracted position, and wherein the insertion part is separated in the axial direction from the hole portion when the shaft is in the retracted position, the insertion part being inserted into the hole portion to allow the shaft to be placed in the mounted position. |
