Control Details

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Control Details
For main scanning direction, the machine moves the CCD unit to the following CCD original detection positions according to the location of original to measure the CCD level of each detection position. For sub scanning direction, the machine uses the original sensor 1, 2 to identify sizes.
1. 2 points original detection at each detection position
For each point of measurement in main scanning direction, the machine checks the presence/absence of an original with reference to the CCD output at 2 points near the point of measurement.
* The machine checks if the signal is changed or not from ADF (pressure plate) open to close at both points of 1A and 1B.
Change in the signal: Yes
Change in the signal: No
Judgment is done by the measurement results of 1A and 1B, and it indicates the presence of original if either point shows No (absence). It indicates absence of original if both signals show Yes (presence).

Change | Result of detection
1A | 1B
Yes | Yes | Original absence
No | Yes | Original presence
Yes | No | Original presence
No | No | Original presence

2. Priority on the front sensor
When checking the measurements for main scanning direction, if the absence of an original is indicated at the rear while the presence of an original is indicated at the front, the machine will give priority to the indication at the front.
In case of B5 size original

Position of detection | Result of detection | Result of identification
1 | Yes | Yes
2 | No | Yes
3 | Yes | Yes
4 | Yes | Yes
5 | No | No
6 | No | No