When the machine signals the ADF to start feeding, the ADF feed motor [A] drives the pick-up roller [C], the feed belt [B], and the ADF separation roller [D], and these rollers feed the original.
This machine uses the FRR method as the separation mechanism, with a feed belt [B] and ADF separation roller [D].
When the pick-up roller [C] feeds two or more sheets into the feed belt unit [B], the ADF separation roller [D] rotates backward to push all sheets back to the original tray except the top one. Then one sheet of the original remains and the ADF separation roller [D] rotates forward due to the torque from the torque limiter included in the ADF separation roller. Then the original is transferred by the feed belt [B] and bumps into the entrance roller [E] to correct the skew.
After skew correction at the entrance roller, the ADF entrance motor [A] and the ADF transport motor [B] drive the ADF entrance roller [C] and relay roller [D] to feed the original towards the exposure glass.
When the interval sensor [A] detects the original, the ADF scanning motor [B] drives the pre-scanning entrance roller [C], scanning relay roller [D], white roller [E], and ADF transport roller [F] in order to pass the original through the scanning area. (L: Original Registration Sensor)
After the pre-scanning entrance roller starts to rotate, the ADF entrance motor drives faster to make the space smaller between the former sheet (on the scanner) and the next sheet. However, if the sheet reaches the pre-scanning entrance roller [C] at this speed, original buckle may occur due to the disparity of roller rotation speeds. So when the interval sensor [A] detects the leading edge, original transport speed slows down so that the roller speeds match when the leading edge of the original reaches the pre-scanning entrance roller [C]. |
The ADF exit motor [B] drives the exit roller [C] to send original out to the exit tray when the original exit sensor [A] detects the original.