| 摘要 |
PURPOSE:To drive the device by a motor in a continous paper printing device and the like, by providing a movable base, which can be freely moved in the moving direction, in a supporting beam, mounting the motor on the base, and transmitting the output to a ball screw part. CONSTITUTION:A DC servomotor is driven in response to the deviation signal of the web 2 by a scanner 5, and an external thread 27 of the ball screw 26 is rotated through a speed reducing device 24. Said rotation moves the moving beam 10 as well as two parallel guide rolls 1a and 1b through an inner tube 28, a bearing 30, and an outer case 31, and corrects the deviation of the web 2. Rotating kinematic pairs exists in two parts, i.e. the part between a base 20 which is fixed to both sides of the supporting beam 12 and the movable base 22 which is coupled to the base 20 and the part of the bearing 30. Therefore excessive forces are not applied on the parts in the guide roll driving mechanism 7 in the movement of the moving beam 10, and a long life and high accuracy in the guide roll displacement are obtained. |
