Method and apparatus for driving rewinding shafts for slit strips

Abstract

A method and apparatus for driving a plurality of strip rewinding shafts or cores are provided. The apparatus includes a plurality of hydraulic motors for separately driving a plurality of strip rewinding shafts or cores. The hydraulic motors are connected parallel with a common hydraulic pump to be independently and simultaneously driven by the pump. The hydraulic pump is in turn connected to a DC electric motor, the operation of which is controlled by a torque control to provide an output rotation of a desired torque characteristic. Also connected to the input of the torque control are means for setting the rotational speed of the DC motor, means for detecting the diameter of at least one strip roll being wound and means for detecting the output rotation of the DC motor. In response to output signals from these means, the torque control functions to control the operation of the DC motor for providing the output rotation of a desired torque characteristic which controllably drives the rewinding shaft simultaneously and independently through the hydraulic pump and its associated hydraulic motors.

Dependencies are inferred from the claim text.