Abstract: A developer housing of an electrostatographic reproducing machine of the type using a magnet roll is provided with two openings in at least one of its side walls. The first of these holes is located at the high pressure portion of the housing, and the second of the holes is located at the low pressure end of the housing. The holes are interconnected by a pneumatic duct. A pressure differential is created as vane-like whiskers of developer are rotated about the magnet roll. The duct neutralizes these pressure differentials within the developer housing, thus preventing toner from being blown out of the developer housing.

Abstract: A reproducing machine has a rotatable toner supply cartridge which dispenses toner into a developer sump, the cartridge being inclined at an angle with respect to the horizontal axis so as to dispense toner assisted by gravity, in controlled amounts only from a dispense port at the end of the cartridge extending below the horizontal. The supply cartridge is modified by the addition of an end cap assembly which incorporates a scoop member which picks up and stores a quantity of toner during rotation. A cog wheel is mounted on the outside of the end cap assembly and is attached to a shaft extending through the end cap assembly. The cog wheel interacts with stepping pins to enable a dispense operation from the scoop member.

Abstract: A reproduction machine having a rotatable toner supply cartridge which dispenses toner into a developer sump, the cartridge being inclined at an angle with respect to the horizontal axis so as to dispense toner, assisted by gravity in controlled amounts only from the end of the cartridge extending beneath the horizontal.