| 摘要 |
Welding head for the formation of a metal mesh comprising longitudinal wires (12) and transverse wires (13), comprising at least a feed unit (16) able to feed step-wise a plurality of longitudinal wires (12), and a welding unit (17) by means of which the longitudinal wires (12) are welded to corresponding transverse wires (13). The welding unit (17) comprises at least two electrodes (19,20) selectively movable between a first feed position, in which at least a first electrode (19) is distant from the transverse (13) and longitudinal (12) wires, and a second welding position, in which both the electrodes (19,20) contact and grip the wires (12,13) and apply different tensions in order to weld the wires to each other (12,13). The welding head comprises at least a movement member (22) operatively associated at least with the first electrode (19) in order to move it between the first and the second position, first sensor members (25) associated with the movement member (22) and configured to detect the position of the first electrode (19) with respect to the two wires (12, 13) and/or second sensor members (30,31) associated with the movement member (22) and conformed to detect the working pressure of the first electrode (19). |
