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30 March, 1999
2.1.5 TONER SUPPLY CONTROL
This machine uses fuzzy logic to control the amount of toner supplied to the
development unit so that the development capacity does not fluctuate due to toner
consumption, toner supply, agitation, or extended periods of nonuse. This control is
accomplished using the sense data from the drum potential sensor, toner end
sensor, ID sensor, and TD sensor. This copier starts toner supply control by
keeping the toner density in the developer constant using the TD sensor. It then
senses the amount of toner on the drum using the ID sensor pattern. The ID sensor
sends the pattern data back to the toner supply control mechanism and the amount
of toner on the drum surface (image density) then becomes the target. The TD
sensor provides a stable base point for toner supply and thus avoids runaway feed-
back of toner supply. The basic input/output parameters that this copier uses
during toner supply control are listed below.
1. Targets to be sensed
1) Density of the toner read by the TD sensor
2) Amount of toner attached to the drum sensed by the ID sensor
3) Pixel count
2. Target to be controlled
Toner supply clutch on time
Toner Supply Control Modes
This copier controls the supply of toner in three modes.
1. Fuzzy logic Control Mode
Default toner supply control mode. The TD sensor, ID sensor, and pixel count
are used in this mode.
2. Proportional Control Mode
This mode is used when an ID sensor becomes faulty. Only the TD sensor is
used to control toner supply.
3. Fixed Supply Mode
This mode is used when both the TD sensor and ID sensor become faulty.
2-13
PROCESS CONTROL
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