Importance

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Abstract

Double-spot welding machine for producing wire grids (G), having welding lines (S.sub.1, S.sub.2) of top and bottom electrodes (2, 3), which welding lines (S.sub.1, S.sub.2) are arranged at a mutual distance apart in a longitudinal wire advance direction and run transversely to the longitudinal-wire advance direction. A cross-wire feed apparatus (9) feeds two cross wires (Q.sub.1, Q.sub.2) along two insertion lines (E.sub.1, E.sub.2) arranged in front of the welding lines (S.sub.1, S.sub.2) at their predetermined distance from one another. A cross-wire transfer apparatus (10) transfers the cross wires (Q.sub.1, Q.sub.2) from the insertion lines (E.sub.1, E.sub.2) into the welding lines (S.sub.1, S.sub.2). The longitudinal wires (L) are advanced to the welding lines (S.sub.1, S.sub.2) and the welded wire grid (G) is pushed out of the welding lines (S.sub.1, S.sub.2). A holding arrangement (15, 18) holds the cross wires (Q.sub.1, Q.sub.2) in interengaged position in recesses (13) on support arms (12) which are displaceable relative to the longitudinal wires (L) during the transfer from the insertion lines (E.sub.1, E.sub.2) into the welding lines (S.sub.1, S.sub.2). A control device (C) controls raising and lowering of one electrode row per welding line (S.sub.1, S.sub.2) in cycles, as well as feeding, transfer and advance devices for the longitudinal and cross wires, in synchronism, but not necessarily at the same speeds, or time intervals.

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First Claim