3.7 ORIGINAL SIZE DETECTION
There are three reflective sensors (APS sensors) in the optics cavity for the
original size detection. The original width sensor [A] detects the original
width, while the original length sensor -1 [B] and original length sensor -2 [C]
detect the original length.
Inside the original width sensor [A], there is an LED [C] and three
photoelectric devices [D].
The light generated by the LED (photo transmitter) is broken up into three
beams, and each beam scans a different point of the exposure glass. The
original length sensors [B], [C] use only one beam. If the original or platen
cover is present over the scanning point for a particular sensor even if it is
40-50mm above the glass surface, the beam is reflected. Each reflected
beam activates a photoelectric device. (photoreceptor)
[C]
APS5
[B]
APS4
[A]
[C]
[D]
APS1
APS2
APS3
SCANNER UNIT
A166/A187/A189 2-34 SM
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