Feeding device, feeding cassette, and image forming apparatus

A feeding device configured to feed a sheet, the feeding device comprising:

• a feeding cassette capable of being inserted into and pulled out from a main body of an apparatus, wherein the feeding cassette includes:
• a stacking portion on which the sheet is stacked;
• a first positioning unit provided movably in a first direction and a second direction opposite to the first direction and configured to regulate a position of the sheet stacked on the stacking portion, the first positioning unit has a first side regulating member and an engaging member, the first side regulating member including a first abutting portion configured to contact with an edge of the sheet, the engaging member including an engaging portion configured to engage with the first side regulating member, the engaging member and the first side regulating member move integrally in a state that the engaging portion engages with the first side regulating member and the engaging member moves with respect to the first side regulating member in a state that the engaging portion does not engage with the first side regulating member;
• a second positioning unit provided movably in the first direction and the second direction and configured to regulate the position of the sheet stacked on the stacking portion;
• a frame member configured to movably hold the first positioning unit and the second positioning unit;
• a locking member configured to lock a movement of the first side regulating member with respect to the frame member, a lock of the first side regulating member locked by the locking member being released by the engaging member moving with respect to the first side regulating member;
• and
• an interlocking unit configured to move the engaging member and the second positioning unit in conjunction with each other,
• wherein the locking member is provided on the first side regulating member, and
• wherein the first regulating member includes a lock engagement portion provided on the frame member, the locking member being movable between a lock position where the locking member engages with the lock engagement portion and a release position where the locking member does not engages with the lock engagement portion.