Sheet conveyer device

An image forming apparatus, comprising:

• an image forming unit;
• a sheet container tray, in which sheets can be stored;
• and
• a guide member, which is arranged to be movable on a bottom of the sheet container tray along a movable direction and is configured to restrict a position of edges of the sheets,
• wherein the sheet container tray includes a plurality of first engagement sections, which is provided in a plurality of positions corresponding to a plurality of sizes for the sheets;
• wherein the guide member includes an arm part, which extends longitudinally along the movable direction of the guide member at the bottom of the sheet container tray and is configured to be rotatable in a plane parallel to the bottom of the sheet container tray about a basal end portion of the arm part, and a first engageable part, which is configured to be engageable with the first engagement sections;
• wherein one of the plurality of first engagement sections and the first engageable part is formed to have a concave structure, and the other one of the plurality of first engagement sections and the first engageable part is formed to have a convex structure;
• wherein a first plane in the concave structure, which becomes slidably in contact with the convex structure when the guide member is moved in a pointing direction pointed by a longitudinal tip end of the arm part at the bottom of the sheet container tray, is formed to incline in a more moderate angle with reference to the movable direction of the guide member than an angle of a second plane in the concave structure, which becomes separated from the convex structure when the guide member is moved in the pointing direction;
• wherein the sheet container tray includes a plurality of second engagement sections, which is provided in a plurality of positions at smaller intervals than intervals between the first engagement sections;
• wherein the guide member includes a manipulation member;
• wherein the manipulation member includes the arm part, the first engageable part, a manipulation part to be manipulated by a user, a second engageable part configured to be engageable with the second engagement sections, and an urging part configured to urge the second engageable part against the second engagement sections;
• and
• wherein the second engageable part is separated from the second engagement sections when the manipulation part is manipulated against urging force from the urging part.

An apparatus, comprising:

• a sheet container tray configured to store sheets, and comprising a rib that extends from a side of the sheet container tray and has at least one first engagement section;
• and
• a guide member configured to move back and forth along the rib and maintain slidable contact with the rib, the guide member comprising:
• an arm part configured to rotate about a shaft at a basal end of the arm part;
• and
• a first engageable part configured to engage the at least one first engagement section,
• wherein one of the at least one first engagement section and the first engageable part includes a concave structure, and the other one of the at least one first engagement section and the first engageable part includes a convex structure,
• wherein the concave structure comprises a first wall and a second wall having different slopes,
• wherein the first wall of the concave structure, which slidably contacts the convex structure when the guide member moves in a first moving direction away from the side of the sheet container tray and when the convex structure slides out of the concave structure, is sloped at a first angle with respect to the first moving direction of the guide member,
• wherein the second wall of the concave structure, which slidably contacts the convex structure when the guide member moves in a second moving direction towards the side of the sheet container tray and when the convex structure slides out of the concave structure, is sloped at a second angle with respect to the second moving direction of the guide member,
• wherein the first angle is smaller than the second angle,
• wherein the rib has at least one second engagement section,
• wherein the guide member comprises:
• a second engageable part configured to engage the at least one second engagement section;
• a manipulation member configured to be operated to release the second engageable part from an engagement with the at least one second engagement section,
• a base part, which is arranged in a first plane that is parallel to a bottom surface of the sheet container tray;
• an upright part, which rises from an edge of the base part and is arranged in a second plane that is parallel to the side of the sheet container tray;
• and
• the shaft, which extends along the upright part in an orthogonal direction with respect to the arm part and the base part, and
• wherein the manipulation member is connected to an upper part of the shaft.