Patent ID: 8139987

Claim:
An image forming apparatus comprising: a toner supply cartridge configured and positioned to supply toner; an upper mounting portion configured and positioned to detachably mount said toner supply cartridge; a toner receiving cartridge configured and positioned to receive the toner from said toner supply cartridge which is mounted to said upper mounting portion and which is opened; a lower mounting portion, disposed at a position lower than said upper mounting portion, configured and positioned to detachably mount said toner receiving cartridge; an interrelating mechanism configured and positioned to interrelate a re-closing operation of said toner supply cartridge with relative movement between said toner supply cartridge and said toner receiving cartridge during either one of a dismounting operation of said toner supply cartridge from said upper mounting portion and a dismounting operation of said toner receiving cartridge from said lower mounting portion; and a preventing mechanism configured and positioned to prevent the dismounting operation of said toner supply cartridge and the dismounting operation of said toner receiving cartridge from being concurrently performed.