| 摘要 |
PURPOSE:To make the peripheral speed of a take-up roller always constant even if the take-up diameter thereof changes, by interposing a friction member generating slip corresponding to the take-up diameter of the wind-up roller between the motor driving shaft of the take-up roller and the take-up roller mount part. CONSTITUTION:A take-up roller 7 is rotated by the continuous rotary driving of the drive shaft 20 of a motor 19 and a roller mount member 24 formed by the friction with a plurality of felts 25 therebetween. Therefore, during a time when the take-up amount of an ink sheet is small, both of them are rotated in a ratio or 1:1. However, when the take-up amount gradually increases and the peripheral speed of the take-up roller 7 gradually increases, friction resistance between the felts 25 is reduced to generate slip and, as a result, the peripheral speed of the take-up roller 7 does not almost change. That is, even if the take-up amount of the ink sheet increases, the increase in the peripheral speed of the take-up roller 7 is automatically suppressed without controlling the number of rotations of the motor 19 and the stable peripheral speed is always kept and no change in the tension of the ink sheet is generated. |
