H. A. Schlatter Ag.

Robert Widmer

Edgar Hochspach

In a device for intermittent straightening of wire there are independent drives for wire feed and the straightening rotor. The speed of rotation (v.sub.2) of the straightening rotor varies essentially synchronously to the feed rate (v.sub.1) of the wire. To cut the wire (t.sub.4) the wire and rotor are stopped. According to the invention the direction of rotation of the rotor is reversed between successive working cycles.

Method of intermittent straightening of wire

A multiple spot resistance welding machine for the welding of wire grids by direct current comprises several contact electrodes (4.1.1, 4.2.1, 4.1.2, 4.2.2, . . . ) contacting a respectively associated grid point from both sides. The switching arrangement for the simultaneous application of welding current to all contacted grid points exhibits, for each contact electrode pair (4.1.1/4.2.1, . . . , 4.1.5/4.2.5), a welding transformer. Juxtaposed welding electrode pairs are floating with respect to potential in accordance with this invention so that the sole transverse connection is constituted by the transverse wire (1). A separate contact electrode pair is provided for each grid point.

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Hausen, Switzerland

Robert Widmer