| 摘要 |
A detection hole is formed in a belt. When the detection hole arrives at the reference/edge sensor, the light from the reference signal detection light emitting element passes through the detection hole, and then arrives at the reference signal detection light receiving element. The controller operates so that data is transmitted to the laser scanner units at the wiring timing of each data based on the reference signal. Furthermore, the reference/edge sensor has another pair of light emitting and receiving elements, i.e., an edge signal detection light emitting element and an edge signal detection light receiving element. The belt is so attached that its end portion can always remain within a detectable area. In addition, corresponding to an area in which the belt shields a detectable range, it is possible to obtain an edge signal changing in analogue manner. In accordance with a change of the edge signal, the controller can thus control a steering roller.
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