Sheet storage apparatus and image forming apparatus

A sheet storage apparatus storing a sheet to be fed in a sheet feeding direction, the sheet storage apparatus comprising:

• a sheet storage portion configured to selectively store the sheet of a first size and the sheet of a second size, a length of the sheet of the first size in the sheet feeding direction being a first value, a length of the sheet of the first size in a width direction orthogonally intersecting with the sheet feeding direction being a second value, a length of the sheet of the second size in the sheet feeding direction being a third value that is shorter than the first value, a length of the sheet of the second size in the width direction being a fourth value that is longer than the second value;
• a first trailing edge regulation surface disposed in the sheet storage portion and configured to regulate a position of a trailing edge of the sheet of the first size stored in the sheet storage portion in the sheet feeding direction;
• a second trailing edge regulation surface disposed, in the sheet storage portion, downstream of the first trailing edge regulation surface in the sheet feeding direction and outside the sheet of the first size stored in the sheet storage portion in the width direction, and configured to regulate a position of a trailing edge of the sheet of the second size stored in the sheet storage portion in the sheet feeding direction;
• a pair of side edge regulation units opposite each other and disposed, in the sheet storage portion, by being fixed at a position downstream of the second trailing edge regulation surface in the sheet feeding direction, the pair of side edge regulation units being configured to regulate positions of side edges of the sheet of the second size stored in the sheet storage portion in the width direction;
• and
• a pair of side edge regulation members opposite each other and detachably disposed with respect to the sheet storage portion, the pair of side edge regulation members, in a case being attached, being configured to regulate positions of side edges of the sheet of the first size stored in the sheet storage portion in the width direction.

An image forming apparatus comprising:

• a sheet storage portion configured to selectively store a sheet of a first size and the sheet of a second size, a length of the sheet of the first size in a sheet feeding direction being a first value, a length of the sheet of the first size in a width direction orthogonally intersecting with the sheet feeding direction being a second value, a length of the sheet of the second size in the sheet feeding direction being a third value that is shorter than the first value, a length of the sheet of the second size in the width direction being a fourth value that is longer than the second value;
• a first trailing edge regulation surface disposed in the sheet storage portion and configured to regulate a position of a trailing edge of the sheet of the first size stored in the sheet storage portion in the sheet feeding direction;
• a second trailing edge regulation surface disposed, in the sheet storage portion, downstream of the first trailing edge regulation surface in the sheet feeding direction and outside the sheet of the first size stored in the sheet storage portion in the width direction, and configured to regulate a position of a trailing edge of the sheet of the second size stored in the sheet storage portion in the sheet feeding direction;
• a pair of side edge regulation members opposite each other and disposed, in the sheet storage portion, downstream of the second trailing edge regulation surface in the sheet feeding direction, the pair of side edge regulation members being configured to be selectively detachably attached to a first position and a second position, the pair of side edge regulation members regulating positions of side edges of the sheet of the first size stored in the sheet storage portion in the width direction at the first position, the pair of side edge regulation members regulating positions of side edges of the sheet of the second size stored in the sheet storage portion in the width direction at the second position;
• a sheet conveyance unit configured to feed the sheet stored in the sheet storage portion;
• and
• an image forming unit configured to form an image on the sheet fed by the sheet conveyance unit from the sheet storage portion.