US 7,532,830 B2
Environmental controls for operation of an electrostatographic developer unit having multiple magnetic brush rolls
Ajay Kumar, Fairport, N.Y. (US); Hirotsugu Oba, Webster, N.Y. (US); Keith Allan Nau, Webster, N.Y. (US); David Antwone Reed, Rochester, N.Y. (US); Cory Joseph Winters, Rochester, N.Y. (US); Michael Donald Thompson, Rochester, N.Y. (US); Allen T. Retzlaff, Rochester, N.Y. (US); Jennifer Rea Wagner, Ontario, N.Y. (US); Paul W. Morehouse, Jr., Webster, N.Y. (US); Rasin Moser, Fairport, N.Y. (US); Song Feng Mo, Webster, N.Y. (US); Rachael L. McGrath, Churchville, N.Y. (US); and John Franklyn Knapp, Fairport, N.Y. (US)
Assigned to Xerox Corporation, Norwalk, Conn. (US)
Filed on Jul. 31, 2006, as Appl. No. 11/496,646.
Prior Publication US 2008/0025739 A1, Jan. 31, 2008
Int. Cl. G03G 15/09 (2006.01)
U.S. Cl. 399—44  [399/55; 399/269; 399/270] 19 Claims
OG exemplary drawing
 
1. A development station for an electrostatographic printing machine, comprising:
a developer housing, for retaining a quantity of developer having semi-conductive carrier particles and toner particles;
a first magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the first magnetic roll to present developer on one side of the first magnetic roll to a photoreceptor;
a second magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the second magnetic roll to receive developer from the first magnetic roll and present developer on one side of the second magnetic roll to the photoreceptor, the second magnetic roll being vertically displaced from the first magnetic roll so that a gap exists between the first and the second magnetic rolls;
an environmental sensor for generating an environmental condition signal;
a variable voltage supply coupled to the first magnetic roll and the second magnetic roll; and
a control circuit for adjusting an output level for the variable voltage supply in response to the environmental condition signal.