| 摘要 |
A carriage moving device has a motor, and a carriage. The carriage moves in a first direction when the motor rotates forwardly, while the carriage moves in a second direction which is opposite to the first direction when the motor rotates reversely. The carriage moving device further includes a facing object having a plurality of reflection ratios at a plurality of positions in the scanning direction. A first sensor unit has a light emitting unit configured to emit light to the facing object and a light receiving unit configured to receive light reflected by the facing object. A second sensor unit is configured to output a second signal in response to movement of the carriage. The controller notifies an error of the second sensor unit in response to a condition where a changing amount of the first signal in the reversing step exceeds a threshold amount and the controller cannot obtain the second signal. |
