| US 7,546,069 B2 | ||
| Xerographic developer unit having multiple magnetic brush rolls with a grooved surface | ||
| Ajay Kumar, Fairport, N.Y. (US); Keith A. Nau, Webster, N.Y. (US); Jonathan D. Sadik, Rochester, N.Y. (US); David A. Reed, Rochester, N.Y. (US); and Cory J. Winters, Rochester, N.Y. (US) | ||
| Assigned to Xerox Corporation, Norwalk, Conn. (US) | ||
| Filed on Oct. 31, 2005, as Appl. No. 11/262,577. | ||
| Prior Publication US 2007/0098458 A1, May 03, 2007 | ||
| Int. Cl. G03G 15/09 (2006.01) | ||
| U.S. Cl. 399—269 [399/276; 399/274] | 22 Claims |
| 1. A development subsystem for an electrostatographic printing machine, comprising:
a developer housing, for retaining a quantity of developer having semiconductive 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, the longitudinal grooves on the first magnetic roll being separated
from one another by a distance of approximately 1.2 mm to approximately 1.4 mm;
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, the longitudinal grooves on the second magnetic roll being separated
from one another by a distance of approximately 1.2 mm to approximately 1.4 mm;
a motor coupled to the first and the second magnetic rolls to drive the rotating sleeves of the first and the second magnetic
rolls in a direction that is against the direction of a photoreceptor that rotates in proximity to the first and the second
magnetic rolls and the first and the second magnetic rolls carry semiconductive carrier particles and toner particles through
a development zone formed by the first and the second magnetic rolls; and
a trim blade mounted proximate one of the first or the second magnetic rolls to form a trim gap of approximately 0.5 to 0.7
mm.
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