| 摘要 |
A winder for webs of sheet material utilizes a pair of drive motors of different, although slightly overlapping, speed ranges for driving the cores upon which the webs are wound. The motor having the higher speed range is connected to one end of the core by an air clutch and the motor having the lower speed range is connected to the opposite end of the core by an overrunning clutch. The first motor, therefore, drives a core at a steadily decreasing speed and increasing torque as the overall diameter of the roll being built on the core increases. When this speed decreases to the upper speed limit of the second motor, the overrunning clutch engages and allows the drive to be transferred to the second motor. This permits the building of significantly larger rolls than would be feasible with a single drive motor.
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