Patent ID: 7441682

Claim:
Wire feeder apparatus having a carrying body, the carrying body having two opposite sides, each side having an opening therein, with tubular guide elements fixed in the openings on the two opposite sides of the carrying body determining a straight-line path for welding wire, further, having two spatially separated feed rolls with parallel axles and provided with grooves on their curved surface fitting to the path of wire, which feed rolls are pivotally fixed on a mounting plate of the carrying body and each feed roll is individually connected to a gear-wheel via interlocking connection, further, having a pressure arm fixed to the carrying body by a turning joint, which pressure arm carries two pinch rollers having parallel axles with the feed rolls, further, having a fixing arm connected to the carrying body by a turning joint, in one position the fixing arm elastically presses the pressure arm to the carrying body and keeps it in this position, in one extreme, closed position of the pressure arm that can be fixed by the fixing arm the pinch rollers are pressed to the feed rolls and connected to the feed rolls via forced driving coupling, in the other extreme position of the pressure arm the pinch rollers are detached from the feed rolls, further, a gear-wheel is situated between the feed rolls, characterised in that the pinch rollers are mounted on a self-adjusting device fixed to the pressure arm, further, the apparatus has a guide-pulley fixed to the self-adjusting device between the pinch rollers in a way that it can freely revolve, and there is a welding wire guiding groove running around the surface of this guide-pulley, and in the closed position of the pressure arm this wire guiding groove fits to the path of wire.