| 摘要 |
PROBLEM TO BE SOLVED: To adjust reflective optical sensors for detecting the position of recording paper in order, not via manual control, in accordance with dispersion in their characteristics and mounted positions, fluctuations in their environment, and the like. SOLUTION: The recording-paper edge position detection method using a reflective optical sensor detects the edge position of recording paper by radiating light on it and figuring out the output level of the reflected light. As a reflective optical sensor 22 detects edges of recording paper at a first position, another sensor 24 detects the next recording paper at a second position upstream of the first position along the recording paper feed path. Upon such detection of the next recording paper, both recording paper sheets are delivered downstream only by a preset distance set longer than the interval between the first and second positions. With the next recording paper certainly set at the first position, controlled variables for the light emitting part of the reflective optical sensor 22 are controlled until the light receiving part thereof produces a target output level. Those controlled variables regulated in this way are used to drive the light emitting part and thereby detect edge positions of recording paper.
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