Patent ID: 8000637

Claim:
An image forming apparatus comprising: a charger to charge an image carrying member; an optical device to irradiate a light onto the image carrying member to form an electrostatic latent image; a developing device to develop the electrostatic latent image on the image carrying member to form a developed image; and a transfer device to transfer the developed image on a sheet, the developing device including: a developer container to store a developer including toner and a carrier; a developer supply device to supply the developer to the developer container; a developer collection device to collect a surplus developer left over due to supply of the developer from the developer supply device to the developer container; a collected developer container to contain the developer collected by the developer collection device; and a drive device to interlock the developer supply device and the developer collection device, the drive device comprising a drive pulley provided on a drive shaft driving the developer supply device, a driven pulley provided on a drive shaft driving the developer collection device, and a timing belt stretching between the drive pulley and the driven pulley.