Patent ID: 8186671

Claim:
A sheet feeding device comprising: a sheet cassette in which a sheet is loaded; and a sheet feeding roller which feeds the sheet loaded in the sheet cassette, wherein the sheet cassette includes a cassette main body; a supporting plate which is provided in the cassette main body to be able to lift and lower, and which supports the sheets loaded in the cassette main body; a biasing member which biases the supporting plate toward the sheet feeding roller so as to press a tip end of the sheets against the sheet feeding roller; a first rear end restriction member provided movably along a sheet feeding direction and which restricts a rear end of the sheet loaded in the cassette main body; a first slide mechanism which slides the first rear end restriction member on the cassette main body; a second rear end restriction member provided at a position offset from the first rear end restriction member in a width direction of the loaded sheets and movable along a sheet feeding direction and which restricts the rear end of the sheet loaded in the cassette main body; a second slide mechanism which slides the second rear end restriction member on the first rear end restriction member; a notch provided on the first rear end restriction member in which the second rear end restriction member is retracted, in a state that the sheet cassette is extended to load large-size sheets, the second rear end restriction member is retracted in the notch and the sheets loaded in the sheet cassette is restricted by the first rear end restriction member, in a state that the sheet cassette is shortened to load small-size sheets, the sheet loaded in the sheet cassette is restricted by the second rear end restriction member; a first height restriction portion provided on the first rear end restriction member which restricts a height of a sheet of a predetermined size loaded in the cassette main body by a first height; and a second height restriction portion provided on the second rear end restriction member which restricts a height of a sheet of a size smaller than the predetermined size loaded in the cassette main body by a second height lower than the first height, wherein when the rear ends of the loaded sheets are restricted by the first rear end restriction member, the second rear end restriction member is retracted from the first rear end restriction member so that the second height restriction portion of the second rear end restriction member does not contact the rear ends of the loaded sheets.