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Sensing the Remaining Paper
When the paper loaded in the cassette type tray is running out, the sensor flag detecting
the remaining paper is being dropped down and finally fallen into the slit of teh tray whe the
tray is empty. This fallen flag blocks or exposes to the path of the emitted light to the
sensors and so the output values from the sensor vary. This machine detects the remaining
paper using the output values from the two sensors. The two sensors detects 3 status and
show them on the LED in the machine.
.
● : Exposure ○ : Block
Detecting the Paper Jam
If the input sensor is not on within a certain time period after the pickup roller makes one
rotation, the pickup roller rotates one more time. The input sensor is not still on although the
FEELER detecting the
remaining paper
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