Patent ID: 7366453

Claim:
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 that rotates about the stationary core of the first magnetic roll; a second magnetic roll having a stationary core with at least one magnet and a sleeve that rotates about the stationary core of the second magnetic roll; a motor coupled to the first and the second magnetic rolls to drive the sleeves of the first and the second magnetic rolls at a rotational speed that is in a range of about 1 to about 1.5 times a rotational speed of a photoreceptor that rotates in proximity to the first and the second magnetic rolls and in a direction that is against a direction of rotation for the photoreceptor, the first and the second magnetic rolls carrying semiconductive carrier particles and toner particles through a development zone formed by the first and the second magnetic rolls.