Photocopying – Contact printing – Light boxes
Patent
1988-12-23
1990-09-11
Baun, Fred L.
Photocopying
Contact printing
Light boxes
118657, 366296, 366320, G03G 1509
Patent
active
049566750
ABSTRACT:
Magnetic brush development apparatus wherein flow of developer material, distributed in balance across the length of the apparatus, is assured. The apparatus includes a sump containing a supply of developer material. A magnetic brush is spaced from the sump. A feed mechanism, located within the housing between the sump portion and the magnetic brush transports developer material from the sump to the magnetic brush. A ribbon blender, located in the sump, agitates and transports developer material to the feed mechanism. The pitch of the blender blades self adjust as a function of developer imbalance. As material builds up, the blades's pitch angles decrease, reducing the rate of material transport toward areas of maximum build up. Thus, for a blender where the desired flow pattern is end-to-end, the end of the other ribbon near the end of the station toward which material is transported by the outer ribbin is self adjusting. Similarly, the portion of the inner ribbon near the end of the station toward which material is transported by the inner ribbon is self adjusting. The end result is a mixing device that self balances.
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Baun Fred L.
Eastman Kodak Company
Royer William J.
Sales Milton S.
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