Magnetic developing unit with improved toner decorator for magnetic printing

摘要

Disclosed is a magnetic developing unit having a decorator for applying magnetic toner to a latent magnetic image in a downwardly moving magnetic imaging member. Preferably the imaging member is in the surface of a cylinder and the decorator is at the 3 o'clock or 9 o'clock position. The decorator comprises a housing containing a lower toner supply and background cleaner roll, an intermediate toner transfer roll and an upper toner decorator roll. Each of the rolls comprises a rotating non-magnetic sleeve and a plurality of elongated internal magnets which alternate in polarity adjacent the rotating sleeve and their relative positions are adjustable.