Electrophotographic developing behavior of sleeveless magnet roller with non-magnetic toner

A sleeveless magnet roller developing system was studied by using a non-mag netic toner and an iron carrier. A developing roller made from a sintered f errite magnet, with 32 magnetic poles and 0.025 T in magnetic flux density, was employed in this study. Imaging characteristics and developing behavio r were examined in the sleeveless magnet roller developing system in both n ormal and opposite developing directions. The influence oftener concentrati on on the developing characteristics was also examined. It was confirmed th at the developing system had an optimum developing condition for best imagi ng properties. It was also found that the toner concentration in the develo per was stable during continuous printing. These results suggest that devel oping characteristics can be controlled by automatic control of the toner c oncentration.