Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Reexamination Certificate
2002-08-06
2004-04-20
Wellington, A. L. (Department: 1725)
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
C409S140000, C409S138000
Reexamination Certificate
active
06722004
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an innovative automatic device for reshaping electrodes in welding guns.
2. State of the Prior Art
In the prior art the problem of deterioration of welding electrodes is well known and in particular in welding stations such as those of automotive vehicle assembly lines and the like.
During operation the electrodes undergo deformation and surface distortion which progressively reduce the quality of the welds performed.
In most cases the problem has been solved by using dressing devices which periodically mill the electrode tips. Removal of material however reduces the useful life of the electrode and therefore it is sought to perform the dressing operations as rarely as possible. The frequency of the dressing operations is thus the fruit of a compromise between the electrode life and acceptable welding quality decay between operations.
Reshaping devices have also been proposed which follow the electrode tip to seek to give it back the original shape while avoiding material removal. With these devices the shape of the electrode tip is improved but the problem of distortion of the lense shape which can display crests which obstruct welding operations is not solved.
In the prior art it was sought to solve the problem by first passing the electrode through the reshaping device and then in a processing device with material removal. In addition to lengthening electrode dressing operations there is the disadvantage that this involves removal of a certain amount of material. Thus the initial problem of avoiding frequent material removal which shortens the electrode's useful life reappears.
The general purpose of the present invention is to remedy the above mentioned shortcomings by making available an electrode reshaping device which would allow satisfactory dressing and smoothing of the electrode tip with minimal material removal.
SUMMARY OF THE INVENTION
In view of this purpose it was sought to provide in accordance with the present invention a welding gun electrode reshaping device comprising a head with satellites supported by a satellite holder to identify between them opposing seats for the gun electrode tip with the satellite holder being powered to rotate around said seats to move the satellites around the electrode tip zone and provoke reshaping of said tip zone with there being in said seats a support member for the electrode tip in the seat with surface designed for simultaneous smoothing of a lense zone on the electrode tip.
REFERENCES:
patent: 4578005 (1986-03-01), Fuse et al.
patent: 5725340 (1998-03-01), Nakajima et al.
patent: 6024521 (2000-02-01), Swaggerty
patent: 6106203 (2000-08-01), Asmis et al.
patent: 6195860 (2001-03-01), Di Rosa et al.
patent: 1-153208 (1989-01-01), None
Advanced Technologies s.r.l.
Jacobson & Holman PLLC
Ross Dana
Wellington A. L.
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