| 摘要 |
The assembly comprising a motor unit (9), the driving pulley (8), the take-up pulley (6), the movable groove roller (3) is pivotingly mounted with respect to the fixed pressure roller (2) by means of a jack (19) of which the piston (21) bears against the frame (1) under the control of a distributor (20) of which the slide (27) is servo controlled to the variations with respect to a constant value (L) of the distance between the axis (10) of the motor unit (9) and the axis (11) of the take-up pulley (6), so that the pressure exerted on the wire is automatically adjusted to the required value. |
