| 摘要 |
PURPOSE:To control tension with high accuracy such that the traveling speed of a wire rod is controlled to provide smooth acceleration and deceleration curves when starting and stopping commands are given and reverse output signals are sent to a tension adding means to cancel inertial tension. CONSTITUTION:When a wire rod 1 rises and travels in starting winding according to the speed curve VM set in a speed command calculating section 16, the speed VM of the wire rod 1 is differentiated by an inertia tension calculating section 19, the accelerations alphaM of the wire rod 1 is obtained and further inertial tension DELTAF proportional to the acceleration alphaM is obtained. Next, when the output signal of the inertial tension DELTAF is sent to the input of a tension adding signal calculating section 20, it is reversed to generate the reverse output for offsetting the inertial tension DELTAF and it to a magnetic powder clutch 9. Thus, is given additional tension DELTAF' to the take-up side of the wire rod 1 for offsetting the inertial tension DELTAF through the clutch 9 and a double ring sheave 8 to restrain the tension fluctuation of the wire rod 1 and always hold the take-up side tension F under the stable condition.
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