Patent ID: 7540447

Claim:
A braking force control method for a strip-shaped material feeding device including a braking force control device and arranged to feed a strip-shaped material of a web roll, said strip-shaped material feeding device including web roll support means having a rotating shaft for supporting said web roll, brake means for applying a first braking force in a rotating direction to said rotating shaft, and drive means for applying a drive force in the rotating direction to said rotating shaft and a second braking force in the rotating direction to said rotating shaft, said braking force control method comprising: applying only the second braking force when a required braking force is smaller than a maximum braking force applicable by said drive means; and applying the first braking force simultaneously with the second braking force when the required braking force is larger than said maximum braking force, such that the brake means applies the first braking force only when the required braking force exceeds the maximum braking force.