| 摘要 |
PURPOSE:To attain a control without variation in the tension of a film regardless of presence of eccentricity of a winding core by employing a suction device for sucking the film in the direction to give slack to the film. CONSTITUTION:When the tension of a film 1 decreases, the film 1 between guide roll 2 and 3 slacks due to suction force of a suction device 7, and a position detection device 15 detects the slack to make a control device 14 work to increase the drive force of a core drive device 12. As a result, the rotation of a shaft core 9 is accelerated, the winding up tension of a roll-like film 10, namely the tension of the film 1, increases. When the tension of the film 1 increases on the contrary, the slack of the film 1 between the guide rolls 2 and 3 decreases, the position detection device 15 detects the decrease in the slack to make the control device 14 work to decrease the drive force of the winding core drive device 12. As a result, rotation of the shaft core 9 is decelerated and the winding tension of the roll-like film 10, namely the tension of the film 1, decreases.
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