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US 5,512,985 AGranted
Developer at modification using a variable speed magnetic roller in an admix housing
AssigneeXerox Corporation
InventorLarry G. Hogestyn
Life of this patent
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Abstract
Developer A.sub.t is modified using a magnetic brush structure disposed in an admix channel of a developer housing. The brush structure includes a stationary magnet arrangement, a rotating shell and a trim bar. A variable speed motor is provided for rotating the shell at different speeds for controlling developer triboelectrification performance.
Claims2
Developer A.sub.t modification apparatus comprising:
- an admix channel;
- an admix auger in said channel;
- developer material comprising carrier beads and toner;
- means for adding fresh toner to said channel;
- means including a stationary magnet arrangement, a rotatable shell encircling said arrangement and a trim bar adjacent said admix auger for varying the A.sub.t of said developer, At being proportional to:
- Tribo*(TC+C.sub.o)
- where Tribo is the average charge to mass ratio of toner, TC is the toner concentration in percent by weight, and C.sub.0 is a constant;
- and
- a variable speed motor operatively coupled to said shell for effecting rotation thereof at different speeds whereby a more constant A.sub.t is provided throughout various environmental zones.
6 more elements
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed to form a visible image thereof, machine comprising:
- a housing defining a channel storing a supply of developer material;
- means for advancing the developer material along a path of travel to a developer channel;
- means for adding fresh toner to said channel;
- means including a stationary magnet arrangement, a rotatable shell encircling said arrangement and a trim bar adjacent said admix auger for varying the A.sub.t of said developer, At being proportional to:
- Tribo*(TC+C.sub.o)
- where Tribo is the average charge to mass ratio of toner, TC is the toner concentration in percent by weight, and C.sub.0 is a constant;
- and
- a variable speed motor operatively coupled to said shell for effecting rotation thereof at different speeds whereby a more constant A.sub.t is provided throughout various environmental zones.
5 more elements
Dependencies are inferred from the claim text.