| 摘要 |
PURPOSE:To minimize the scattering of a printing position and enable high-quality printing, by controlling the paper-feeding velocity in the period from the moment a paper is in the vicinity of a paper-detecting means to the detection of the paper to be lower than the paper- feeding velocity, before and after the period. CONSTITUTION:In the steps from the moment a paper is in the vicinity of a sensor to the moment the positioning of the leading end of the paper is detected by the sensor, when a comparator 20 detects the coincidence of the number of steps sent from a moving quantity data register 11a with a count from a timer part 60, a coincidence signal causes a controlling part 1 to change over a switch 15 to the side of a stop data register 12c and change over a switch 14 to the side of a low-speed rotation data register 12b. Then, the controlling part 1 accelerates the rotation of a line-feeding motor 4 to a speed specified by the register 12b (a speed sufficiently lower than the speed specified by a high-speed rotation data register 12a), and it again stops the line-feeding motor 4. Under this condition, the controlling part 1 reads a signal 1 from the sensor 32 through a level-changing circuit 7, and when the positioning of the leading end of the paper is not detected by the sensor 32, the controlling part 1 accelerates the rotation of the motor 4 to the speed specified by the register 12b. By this, secure detection by the sensor of the position at which the leading end of the paper is positioned can be achieved, the scattering of a printing position can be reduced, and high- quality printing can be performed.
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