Patent ID: 7963523

Claim:
A sheet stacking apparatus comprising: a stacking portion on which a discharged sheet is stacked; a housing portion which can support the stacking portion so as to lift and lower the stacking portion; and a lifting and lowering mechanism which lifts and lowers the stacking portion, wherein the stacking portion has a connecting portion which connects the stacking portion to the housing portion, the connecting portion can connect the stacking portion to the housing portion in a direction crossing the lifting and lowering direction of the stacking portion, the housing portion has a guide member which is extended in the lifting and lowering direction of the stacking portion, the connecting portion is connected detachably to the guide member in a direction crossing the lifting and lowering direction of the stacking portion, and the guide member comprises a rail member having two opposed guide surfaces which are engaged with the connecting portion, and the rail member has a notch which is opened in a direction crossing the lifting and lowering direction of the stacking portion such that the connecting portion can pass therethrough.