Image forming apparatus including drive transmission member including gears and shafts

An image forming apparatus comprising:

• a photosensitive member;
• a plurality of development devices attachable to and detachable from a main body of the image forming apparatus, each development device comprising a development roller for forming a toner image on a surface of the photosensitive member;
• a motor rotatable forward and backward, for driving the development roller;
• and
• a drive transmission member disposed between the motor and the development roller, the drive transmission member comprising a plurality of gears, a plurality of shafts and a plurality of one-way clutches, wherein at least one shaft is a coupling of a small shaft, and wherein an air gap is provided in a coupling portion of the small shaft.

An image forming apparatus comprising:

• a photosensitive member;
• a plurality of development devices attachable to and detachable from a main body of the image forming apparatus, each development device comprising a development roller for forming a toner image on a surface of the photosensitive member;
• a motor rotatable forward and backward, for driving the development roller;
• a drive transmission member disposed between the motor and the development roller, the drive transmission member comprising a plurality of gears, a plurality of shafts and a plurality of one-way clutches;
• and a drive buffer releasing the engagement between the gears of the drive transmission member.