Variable energy development station using a magnet to restrict developer material flow in the development station

An electro-photographic machine comprising:

• a photoreceptive member;
• a corona generating device for initially charging an image area of the photoreceptive member;
• a latent image generator for selectively discharging the image area of the photoreceptive member to generate a latent image;
• a development station for developing the latent image with toner from developer material supplied by the development station;
• a media supply for providing media sheets;
• a transfer station for transferring the developed latent image from the photoreceptive member to a media sheet received from the media supply;
• a fusing station for permanently affixing the transferred latent image to the media sheet;
• and
• the development station further comprises:
• a development station housing having a developer sump;
• a toner supply for providing toner particles to the developer sump;
• a pair of mixing augers having a volumetric space between the pair of mixing augers in which the mixing augers uniformly blend and charge toner particles into the developer material as the toner particles are provided by the toner supply;
• a magnetic roller for receiving the developer material and bringing the developer material into contact with a photoreceptive member, and
• a magnet positioned to generate a varying magnetic field in the volumetric space between the pair of mixing augers to restrict flow of developer material being moved by the mixing augers.