Abstract: A bead pickoff device for removal of carrier beads adhering to a charge retentive surface subsequent to development of an electrostatic latent image with a developer mix including toner and carrier beads. A stationary magnet member supported within a rotating non-magnetic shell includes a permanent magnet supported in a ferromagnetic strip is provided with first and second sides disposed at an angle in the range of 70.degree. to 110.degree. with respect to each other. The first long side is supported with angled surface free end adjacent the charge retentive surface. The stationary magnet is seated on the second side, spaced from the first. The magnetic field is concentrated in the space between the magnet and the first side to provide an increased bead pickoff force at the charge retentive surface, while the field is attenuated to reduce the force of attraction on the beads as they move away from the charge retentive surface.

Abstract: An apparatus which develops a latent image by transporting marking particles into contact therewith at least two successive times. An operator adjustable voltage source is coupled to the marking particle transport to electrically bias the transport to at least either a first electrical potential optimizing development of solid areas with the marking particles during the first contact time or to a second electrical potential suppressing development of solid areas. The transporting means is electrically biased to an electrical potential substantially optimizing development of lines with the marking particles during the second contact time.

Abstract: A system is provided for the production of an electrostatographic copy of an original comprising:A. means for forming an electrostatic latent image on an electrostatographic surface;B. means for bringing the electrostatic image into developing configuration with a patterned applicator containing polar liquid developer to produce a developed image; andC. means for varying the contact time between said electrostatic image and said liquid developer applicator to thereby change the amount of liquid developer deposited on the surface areas of relatively low potential without significantly affecting the amount of liquid developer deposited in areas of relatively high potential.By variation of the time allowed for development, contrast variations in the developed image can be provided over a range of development speeds without a significant variation in the maximum density of the developed image.