Toner replenishment mechanism with simple constitution, image forming apparatus with toner replenishment mechanism, and toner replenishment control method

A method for controlling toner replenishment, comprising:

• preparing a first ratchet mechanical unit, the first ratchet mechanical unit engaging a pinion of a drive shaft of a motor, the first ratchet mechanical unit transmitting only rotary drive power in a forward direction by the pinion to a driven mechanism disposed at a first toner replenishment unit, the first toner replenishment unit replenishing a first developer unit with a first color toner;
• preparing a second ratchet mechanical unit, the second ratchet mechanical unit engaging the pinion, the second ratchet mechanical unit transmitting only rotary drive power in a reverse direction by the pinion to a driven mechanism disposed at a second toner replenishment unit, the second toner replenishment unit replenishing a second developer unit with a second color toner;
• and
• controlling toner replenishment of two colors by the one motor using the first ratchet mechanical unit and the second ratchet mechanical unit.