ELECTROPHOTOGRAPHIC DEVICE WITH RETURN FROM UNUSED DEVELOPMENT POWDER TO DEVELOPMENT POINT.

摘要

1296764 Xerographic drum cleaning XEROX CORP 30 June 1970 [3 July 1969] 31611/70 Heading G2H Residual toner removed from a xerographic drum 10 is recycled to a cascade development station 20 by delivery to a collecting chamber 57 at one side of the drum by means of a screw conveyer 55 and passage through a tube 66 to a dispensing slit 90 by means of an endless bead conveyer 64. Toner supply hopper 21 contains a dispensing roll, Fig. 4 (not shown). The toner may be removed from the drum by a blade 48 or an electrically biased brush, Fig. 5 (not shown).