Sheet discharge device and image forming apparatus including the same

A sheet discharge device comprising:

• a discharge roller configured to discharge a sheet from a sheet discharge port toward a sheet discharge tray;
• a detection portion configured to detect that a stack height of sheets on the sheet discharge tray has reached a predetermined detection position;
• and
• a detection position changing mechanism configured to change the detection position for the detection portion, wherein
• the detection portion includes:
• a first pivoting shaft that is parallel with an axis direction of the discharge roller;
• a first pivoting body that is attached to the first pivoting shaft and extends in a radial direction of the first pivoting shaft;
• a second pivoting shaft that is configured to be coupled with the first pivoting shaft;
• a second pivoting body that is attached to the second pivoting shaft and extends in a radial direction of the second pivoting shaft;
• and
• a sensor configured to detect that the second pivoting body has reached the detection position,
• the first pivoting body contacts an upper surface of the sheets stacked on the sheet discharge tray and is pivotable to a position that corresponds to the stack height of the sheets on the sheet discharge tray,
• the second pivoting body is pivotable in conjunction with a pivoting operation of the first pivoting body, and
• the detection position changing mechanism is a shaft coupling portion configured to couple the first pivoting shaft with the second pivoting shaft at an arbitrary position among a plurality of rotational positions that are defined in a circumferential direction.