Wireworking – Joining wire – Electric welding
Patent
1991-01-10
1992-05-19
Larson, Lowell A.
Wireworking
Joining wire
Electric welding
B21F 2710
Patent
active
051139154
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a welding machine for manufacturing grids from longitudinal and transverse wires intersecting one another at right angles and welded at the intersections, having a device for delivering the longitudinal wires in a horizontal welding plane, two mutually spaced apart devices, disposed on feed lines, for simultaneous feeding or injection of two transverse wires, a welding electrode arrangement for performing double spot welding in the direction of the longitudinal wires, and two feeder arms for transferring the transverse wires from the feed lines to the welding lines; the feeder arms are disposed outside the outer longitudinal wires and are movable back and forth on predetermined paths of motion between the feed lines and the welding lines, by means of a common feeder arm holder extending at right angles to the longitudinal wire direction.
In a grid welding machine known from Austrian Patent 267.293, two transverse wires are simultaneously delivered to two feed lines disposed at a fixed distance from one another, pushed forward to the welding lines by means of transverse wire feeders, and there welded to the longitudinal wires with the aid of double spot welding electrodes. One disadvantage of this known grid welding machine is that only grids having a single predetermined, invariable transverse wire spacing, which is equivalent to the mutual spacing of the transverse wire feed lines, can be produced.
In a grid welding machine of the type described initially above and known from Austrian Patent 373.799, this disadvantage is overcome; here the positionally fixed feed lines of the two transverse wires are disposed at a fixed mutual spacing, while contrarily the two welding lines are of variable position. The transfer of the transverse wires from the feed lines to the welding lines is effected with a separate feeder for each transverse wire, and the feeders are mounted on a common holder. The transverse wire feeders can be disposed both between the longitudinal wires, in other words within welding range, and outside welding range. In this known machine, however, triggering the transverse wire feeders entails considerable expense and is often superfluous, because in most applications standard grids with transverse wire spacings that amount to a multiple of a predetermined minimum basic spacing are produced. Both of the above-described known grid welding machines also have the disadvantage that the transverse wires rest with variably good alignment loosely in recesses of the transverse wire feeder apparatuses. Especially with close-meshed grids with a small transverse wire spacing and small transverse and longitudinal wire diameters, this results in an asymmetrically structured finished grid web.
Although it is known from Soviet Union Patent 837.668 to clamp a transverse wire during its delivery to the welding line, nevertheless the clamping force is not adjustable but instead depends on the structurally dictated increase in spacing between the clamping jaws during the delivery movement and on the spring constants of any relief springs that may be provided.
THE INVENTION
The object of the invention is to create a grid welding machine of the generic type described at the outset above that makes it possible, while exploiting the advantages of double spot welding, to produce grids the transverse wire spacing of which is equivalent to a predetermined minimum basic spacing or a multiple of this basic spacing of the transverse wires, in a structurally simple and operationally reliable way. Briefly, the welding machine according to the invention is distinguished by the fact that the feeder arms are embodied for receiving both transverse wires jointly and are equipped with clamping devices for the transverse wires; that at least one of the feeder arms, for joint prestressing of both transverse wires, is movable relative to the other feeder arm in the transverse wire direction by means of a mechanical drive mechanism with adjustable clamping force; and that positioning d
REFERENCES:
patent: 2368047 (1945-01-01), Southwick
patent: 3961153 (1976-06-01), Smith et al.
patent: 4468550 (1984-08-01), Gott et al.
Resch Walter
Ritter Gerhard
Ritter Klaus
Schmidt Gerhard
EVG Entwicklungs- u.Verwertungs-Gesellschaft m.b.H.
Larson Lowell A.
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