Browse Prior Art Database

Original Publication Date: 1985-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


In automatic electrostatographic reproducing apparatus there of ten are times when the operator desires to increase the toner concentration rather quickly by the instant addition of a substantial amount of toner. In the design of many machines this can be difficult for a remote toner supply. The figures illustrate a technique in which this particular problem may be solved. In the figures, a toner hopper 10 filled with toner to replenish the toner in the developer housing has an auger 12 running through the bottom of it to transport the toner from right to left in the manner indicated. The bottom of the channel 14 through which the supply auger rotates has a hole 16 in communication with a further channel 18 below the auger 12. In channel 18 in the toner sump the toner flows into the plunger chamber where a plunger assembly 20 is positioned. The plunger includes a knob 21 forcing a bar 22 against compression spring 24 and as the operator pushes the knob in the piston 26 having an "0" ring seal 28 pushes the toner in channel 18 out of the toner hopper and directly into the developer sump. When the plunger is manually released the compression spring returns the plunger handle to its original position. Thus, when a toner concentration increase is desired the operator merely presses the plunger which dumps toner directly into the developer housing. This can be done over and over until the toner concentration is proper or until the copy density is adequate.