Patent ID: 6137975
Filing Date: 2000-10-24
Classification: G03G

Abstract:
A developing device comprisinga plurality of developing units each of which stores a developer containing at least a toner and a carrier and transfers said developer to each of a plurality of developing rollers,a plurality of removable developer cartridges each of which supplies said developer to said each developing unit,a rotator which holds said plurality of developing units, said plurality of developing units successively face a photosensitive drum along with the rotation of said rotator to produce a multicolor image, anda closure member removably provided to an opening portion of said each developing unit through which said each developing roller is exposed to close said opening portion, wherein an amount of protrusion of said each closure member from said rotator is set to a value which prevents said closure member from coming into contact with any parts except for said photosensitive drum when said rotator is rotated.