Magnetic brush hopper agitator for electrophotocopier

Claim 1

In a developing apparatus for use in an electrostatic copying machine, the developing apparatus having a sump for holding two-component developing material consisting of a marking constituent and a magnetic carrier constituent and a hopper for holding and dispensing the marking constituent to the sump, said hopper having an opening at the bottom thereof and a dispensing roller situated above said opening, an improved device for agitating the marking constituent held in said hopper, comprising: a straight section of wire rotatable through said marking constituent in said hopper, said straight section of wire being rotatable about and parallel to a longitudinal center line of said hopper; and a compression spring surrounding and hanging on said straight section of wire, said compression spring being able to contact the hopper 1/3 of said dispensing roller when said compression spring rotates through the lower portion of its cycle and wherein said compression spring is supported entirely by said dispensing roller when said compression spring is in a 6 o'clock position above said dispensing roller, whereby said compression spring prevents bridging of the marking constituent to the walls of the hopper.