Sheet storage apparatus and image forming apparatus

A sheet storage apparatus comprising:

• a sheet storage unit configured to store a sheet conveyed by a sheet conveyance unit, wherein the sheet storage unit includes:
• a first surface on which the sheet conveyed by the sheet conveyance unit is stacked;
• a second surface facing the first surface;
• a moving member protruding from one of the first surface and the second surface to the other of the first surface and the second surface and configured to move from a home position by contacting the sheet conveyed by the sheet conveyance unit;
• a sensor configured to output a signal according to a position of the moving member;
• and
• an extrusion unit configured to extrude at least a part of the sheet stacked on the first surface out of the sheet storage unit,
• wherein, in a case where the moving member is at the home position, at least a part of the moving member overlaps a virtual plane passing through the other of the first surface and the second surface.

An image forming apparatus comprising:

• an image forming unit configured to form an image on a sheet;
• a sheet conveyance unit configured to convey the sheet on which an image has been formed by the image forming unit;
• a first sheet storage unit and a second sheet storage unit which are stacked in a vertical direction and configured to store the sheet conveyed by the sheet conveyance unit, each of the first sheet storage unit and the second sheet storage unit including:
• a lower guide configured to guide a lower surface of the sheet conveyed by the sheet conveyance unit;
• an upper guide configured to guide an upper surface of the sheet conveyed by the sheet conveyance unit;
• a rotary member disposed in one of the lower guide and the upper guide, and configured to rotate from a home position around a rotational axis extending in a direction orthogonal to a sheet conveying direction by contacting the sheet conveyed by the sheet conveyance unit;
• a sensor configured to output a signal according to a position of the rotary member;
• and
• a control unit configured to detect presence of a sheet stored in each of the first sheet storage unit and the second sheet storage unit according to an output of each of the sensors,
• wherein, in a case where a first rotary member included in the first sheet storage unit is at the home position, at least a part of the first rotary member, viewed from a downstream side in the sheet conveying direction, overlaps a virtual line extending in the direction orthogonal to the sheet conveying direction and passing through a rotational axis of a second rotary member included in the second sheet storage unit.

An image forming apparatus comprising:

• an image forming unit configured to form an image on a sheet;
• a sheet conveyance unit configured to convey the sheet on which an image has been formed by the image forming unit;
• a sheet storage unit configured to store the sheet conveyed by the sheet conveyance unit, wherein the sheet storage unit includes;
• a first surface on which the sheet conveyed by the sheet conveyance unit is stacked;
• a second surface facing the first surface;
• a moving member protruding from one of the first surface and the second surface to the other of the first surface and the second surface and configured to move from a home position by contacting the sheet conveyed by the sheet conveyance unit;
• a sensor configured to output a signal according to a position of the moving member;
• and
• an extrusion unit configured to extrude at least a part of the sheet stacked on the first surface out of the sheet storage unit,
• wherein, in a case where the moving member is at the home position, at least a part of the moving member overlaps a virtual plane passing through the other of the first surface and the second surface.