| 摘要 |
PURPOSE:To ensure the detection of the trailing end of recording paper by a method wherein a round hole is provided in the vicinity of the trailing end of the roll-form recording paper, and this round hole part is detected by a reflection-type infrared sensor. CONSTITUTION:A reflection-type recording paper sensor 8 incorporated in a device emits an infrared ray from an emission side 8-a and receives the light reflected by roll-form recording paper 2 into a reception side 8-b as a sensor output. When the roll-form recording paper 2 is consumed and a round hole part 2-b reaches a position just below the recording paper sensor 8, an infrared ray from the emission side 8-a passes through the round hole part 2-b of the roll-form recording paper 2. Therefore, the reception side 8-b does not receive the reflected light, and the sensor output results in zero. This is the state that the trailing end of the roll-form recording paper 2 is detected. Thereafter, the roll-form recording paper 2 is rewound to a predetermined position by a recording paper rewinding mechanism in the device, and an alarm for recording paper exhaustion or the like is indicated on a display board outside the device. |
