| 摘要 |
PROBLEM TO BE SOLVED: To improve detection accuracy of a lateral end position of a sheet material by accurately determining a threshold for detecting the lateral end position of the sheet material.SOLUTION: A line sensor 25 comprises a plurality of elements. Each element comprises a plurality of pixels. In particular, thresholds (a, b, c) for detecting a lateral end position of a sheet material is determined from bright levels (Vhd_a to Vhd_c) and a dark level (Vld) of signals output from an element Ed that is used for actually detecting the lateral side position. |
