Image forming apparatus

An image forming apparatus comprising:

• an accommodating portion configured to accommodate a sheet;
• an image forming portion configured to form an image on the sheet fed from the accommodating portion;
• a lifter plate that is provided in the accommodating portion and on which the sheet is stacked;
• a lifting and lowering mechanism configured to lift and lower the lifter plate;
• a first sensor configured to detect that the lifter plate is at a first predetermined position;
• a second sensor configured to detect the sheet stacked on the lifter plate at a second predetermined position above the first predetermined position;
• a supporter configured to support the lifter plate being at a lower-limit position, wherein the supporter is arranged not to support the lifter plate being at a position above the lower-limit position;
• a locking portion including a latch member movable between (a) a locking position where the latch member locks the accommodating portion so as not to be drawn out and (b) a release position where the latch member permits the accommodating portion to be drawn out;
• and
• a control unit configured to execute an operation in one of a plurality of modes including a first mode and a second mode, when a predetermined instruction is received,
• wherein in the first mode, the control unit causes the lifting and lowering mechanism to lower the lifter plate until the second sensor does not detect the sheet, and causes the lifting and lowering mechanism to stop the lowering of the lifter plate if the first sensor detects that the lifter plate is at the first predetermined position before the second sensor does not detect the sheet, and controls the locking portion such that the latch member is allowed to move to the release position from the locking position after the predetermined instruction is received and before the first sensor detects that the lifter plate at the first predetermined position, and
• wherein in the second mode, the control unit causes the lifting and lowering mechanism to lower the lifter plate to the lower-limit position based on a detection result of the first sensor irrespective of a detection result of the second sensor, and controls the locking portion such that (a) the latch member is kept in the locking position after the predetermined instruction is received before the first sensor detects that the lifter plate is at the first predetermined position and (b) the latch member moves to the release position from the locking position after the first sensor detects that the lifter plate is at the first predetermined position.