| 摘要 |
A mark selection sheet is prepared. The mark selection sheet is preprinted with a plurality of setting marks. The setting marks are printed at various positions and with various sizes. Intensity of light reflected from each setting mark is detected by a reflection type sensor. Based on the detected results, an optimum position, an optimum height, and an optimum width of a quality-check mark is selected, and then stored in an EEPROM.
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