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In a xerographic copier, toner is automatically added to the developer as a result of the variable quantity of light which is reflected off a toned test patch located on the photoconductor's working area.
English (United States)
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Toner Concentration Control
In a xerographic copier, toner is automatically added to the developer as a
result of the variable quantity of light which is reflected off a toned test patch
located on the photoconductor's working area.
The figure schematically shows a copier wherein an original document,
located on glass platen 10, is imaged on rotating photoconductor drum 11 by way
of optics mechanism 12 and light rays 13. The drum's reusable photoconductor
is charged at station 14, developed at magnetic brush developer 15, and cleaned
at cleaning station 16. Cut-sheet paper is supplied to transfer station 17 from bin 18. Interimage erase lamp 21 operates to erase all portions of the
photoconductor with the exception of the photoconductor's working area. The
photoconductor's working area is defined as that area corresponding to the
position and size of paper supplied from bin 18, as this paper passed through the
transfer station. Hot roll fuser 19 fuses the sheet's toner image, downstream of
the transfer station. Finished copies are delivered to exit pocket 20.
The copier's control logic (not shown) is controlled by a drum position sensor,
and is constructed and arranged so as to implement a dummy copy cycle (i.e.,
paper is not supplied to transfer station 17) once every N copy cycles. Usually N
is in the range of from 5 to 35.
During this dummy cycle, charging station 14 charges the photoconductor to
approximately -850 volts. Interimage erase station 21 operates c...