| 摘要 |
PURPOSE:To prevent a sheet material from slacking, tensioning or damaging due to variations in a tension by limiting the variation in a torque for a rewinder to the minimum limit when a drive motor of the rewinder is switched. CONSTITUTION:When a switching timing is detected by a switching timing detector 20, a motor 3 is started to control the speed by a speed controller 10 so as to coincide with the rotating speed of a motor 2. When a speed coincidence is detected by a speed synchronization detector 21, a relay coil R2 is excited, a contact S2A is closed, a contact S2B is opened to switch the motor 3 from the speed control to the current control and to simultaneously connect a clutch 13. At this time, the motor 2 is controlled by the normal current reference, and the motor 3 is controlled by the minimum current reference. |
