APPARATUS FOR DEVELOPING LATENT ELECTROSTATIC CHARGE IMAGES

摘要

An apparatus for developing latent electrostatic charge images by means of a magnetic brush wherein there is provided a rotatably mounted scoop or bucket wheel formed of insulating material and serving for dispensing a mixture of magnetic and toner particles. Above the scoop wheel there is arranged a rotatably mounted drum formed of non-magnetic material and within which there is provided a stationary magnet system with a core of soft magnetic material and prismatic permanent magnets arranged about such core. The magnets starting from the lowest location of the internal compartment of the drum and within the ascending drum wall possess alternating polarity and at least two successive permanent magnets at the upper portion of the inner compartment of the drum have the same polarity.