Patent ID: 7389958

Claim:
A core locking device in a two-drum winder, comprising: a locking member for locking the core locking device to a winding core of a roll to be wound on the two-drum winder, which core locking device is placed on a slide arranged in connection with the two-drum winder, which core locking device moves, as winding progresses, with a center of the roll being formed along the slide, the core locking device moving with the center of the roll being formed forwards on the slide, so that the core locking device will gradually be at an angle with respect to the slide, with the result that a force is produced in the center of the roll because of the weight of the core locking device; an actuator arranged to produce a counterforce for the force caused by the mass of the core locking device in the changed position of the core locking device; a frame structure mounted to the slide, the locking member being pivotably mounted to the frame structure; and an angle sensor arranged in connection with the actuator for measuring the pivoting angle of the locking member with respect to the frame structure to determine the magnitude of the necessary counterforce.