Toshiba 4580, Service Manual

Page: 314 / 379

Mar. 1999 © TOSHIBA TEC 16 - 23 6570/5570 ADF
16.6 Detection of Original Size
16.6.1 Original size detection method
The number of drive pulses of the feed motor from start of transport of the original standing by at the
initial alignment position up to when the trailing edge of the original being fed passes the aligning sensor
is counted to detect the original size in the feed direction. At the same time, the original size in the width
direction is judged by the size width sensor.
As it is difficult to judge A4 horizontal and letter size horizontal (and also A3 and LD) by detection in the
feed direction and width direction alone as described above, two sensors are provided to detect A4
horizontal and letter size horizontal.
The number drive pulses output by the feed motor between
1
and
2
is counted to detect the size of the
original in the feed direction.
1
Start of transport of original standing by at the initial alignment position
2
Passage of the trailing edge of the fed original through the aligning sensor