How to adjust the tightness of rewinded roll on fabric inspection machine?

The operator can adjust the roll tightness by adjusting the hand wheel.

The hand wheel on the fabric inspection machine is used for adjusting the speed difference of two pulleys. The two pulleys are connected with the twin rewinding rollers separately. If there is speed difference between the two pulleys, there is also speed difference between the two rewinding rollers, and so result in tight or loose fabric rolls. 

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