| 摘要 |
The apparatus comprises a plurality of machines (10, 12, 14) arranged in line along a longitudinal direction (x) coinciding with a feed direction of the blank (C). Each machine (10, 12, 14) is provided with rollers (18, 20, 22) arranged to be driven into rotation by respective motors to work simultaneously on the blank (C) and with a control unit arranged to control these motors. Each machine (10, 12, 14) is provided with measuring means (24) adapted to provide the control unit of that machine with a measure of the overall reaction exerted by the blank (C) under working on the rollers (18, 20, 22) of that machine along the longitudinal direction (x). The control unit of each machine (10, 12, 14) is arranged to torque-control the rollers (18, 20, 22) of that machine in such a manner that the overall reaction exerted by the blank (C) under working on the rollers (18, 20, 22) of that machine along the longitudinal direction (x) is equal to a predetermined value, zero included. |
