| 摘要 |
PURPOSE:To prevent printing from being conducted when a recording medium is misset face side back, by providing a means for detecting whether or not the surface of a recording medium is coated with a UV absorber, and discriminating the face side and the back side of the recording medium on the basis of an output from the detecting means. CONSTITUTION:When a recording paper P is misset face side back and is fed in that state, the surface of the paper coated with an ink absorber is disposed on the side of a UV ray detecting means 20. Therefore, a light component in a UV region of the light emitted from a light emitter is absorbed by a UV absorber incorporated in the ink absorber, so that the light component does not reach a light receiver as reflected light, and UV rays are not detected, resulting in that an output signal at this time is maintained at, for example, a 'Low' level. On detection of the arrival of the recording paper by a paper sensor 16, when the output signal from the detecting means 20 is inverted to 'High', a recording operation is carried out following a predetermined sequence. When the output signal remains 'Low', it is judged that the recording paper is misset face side back or the paper is absent, and the next operation is not conducted. The operation of the recorder is stopped, for example, after reversely feeding the paper. |
