Patent ID: 8204411

Claim:
A method for forming an electrographic image, comprising: generating an electrostatic image on an imaging member; moving the imaging member in a process direction through an image development area defined between a toning shell and the imaging member; rotating the toning shell adjacent to the imaging member, in a co-current direction, such that the portion of the toning shell adjacent to the image development area moves in the process direction; applying developer comprising generally spherical toner having average developer bulk velocity (ADBV) upstream of the image development area, wherein the rotation of the toning shell brings the developer into a developing relationship with the electrostatic image in the image development area and the average developer bulk velocity (ADBV) is in the same direction and proportional to the imaging member velocity; and generating a varying magnetic field within the toning shell, wherein the varying magnetic field generates pole transitions in the image development area, and wherein a rotation direction of the varying magnetic field in the image development area is opposite in sense to the rotational direction of the toning shell.