Method and apparatus for controlling tension with a lock mechanism

摘要

The tension on a tape web is controlled with a lock mechanism in an apparatus wherein a first dancer device, a pair of engaging-disengaging rolls, a second dancer device, and a pair of nip rolls are located in this order from the upstream side to the downstream side in the direction along which the tape web moves. The speed at which the engaging-disengaging rolls rotate is adjusted on the basis of the vertical position of a dancer roll of the first dancer device, and the speed at which the nip rolls rotate is adjusted on the basis of the vertical position of a dancer roll of the second dancer device, whereby the tension on the tape web is adjusted. A method for controlling the tension with a lock mechanism comprises the steps of locking the position of the dancer roll of the first dancer device at a predetermined position when the engaging-disengaging rolls disengage from each other, and releasing the dancer roll of the first dancer device from its locked position when the engaging-disengaging rolls engage with each other.