(57) Electrostatographic developing apparatus including a developer applicator (15) for
applying developer material (18) to an electrostatic latent image on a flexible imaging
surface (1), the developer material comprising magnetically attractable carrier particles
and toner particles. The applicator has within it magnets (16) for establishing a
magnetic field having a region (21) of reduced strength in the development zone, and
an electric field is established between the applicator and the imaging surface in
the development zone. The imaging member (1) passes around a portion of the surface
of the applicator (15) so as to be deflected by the applicator and spaced from it
in use by at least one layer of carrier particles such that during relative movement
between the applicator and the imaging surface, the carrier particles therebetween
are caused to make rotational movements. The resulting shearing action on the toner
particles, together with the electric field, produces a migration of toner particles
towards the imaging surface.
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