| 摘要 |
PURPOSE:To prevent an operation from being continued in an abnormal printing condition and maintain excellent printing quality, by detecting skewing of an ink ribbon, and immediately stopping a printing operation of a printer upon the generation of skewing. CONSTITUTION:A sensor part comprises sensors 7 and 8 provided respectively on the upper side and the lower side of printing electrodes 6 provided on a printing head 5. When an ink ribbon 4 is positionally deviated to the upper or lower side of the electrodes 6 due to skewing, the sensor 8 or 7 located on the outer side comes off the ink ribbon, so that an output signal from the sensor part is accordingly changed. A detecting part detects 11 whether skewing of the ink ribbon has occurred, based on the signal from the sensor part 1. While skewing of the ink ribbon does not occur, a normal printing operation and detection of the feeding condition of the ink ribbon are continued 12. When it is detected that skewing of the ribbon has occurred, the printing operation is stopped. |
