| 摘要 |
PURPOSE:To collect dispersed toner efficiently by collecting toner from an upper side developing unit and recovering the toner into a lower side developing unit. CONSTITUTION:A toner collecting device 15 is arranged between a red developing unit 2A and a black developing unit 2B. The device 15 collects dispersed red toner by a metallic roller to which a bias voltage has been applied. The collected toner is recovered from the surface of the metallic roller 15 by a recovering means and led into the case 13 of the black developing unit 2B. Namely, the recovering means is constituted of a guide member 14 and the metallic roller 15. |
