Wireworking – Article making or forming – Forms and frames
Reexamination Certificate
1999-07-07
2001-03-27
Larson, Lowell A. (Department: 3725)
Wireworking
Article making or forming
Forms and frames
Reexamination Certificate
active
06206052
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to an apparatus for forming a winding for a stator of a dynamoelectric machine, of the type comprising:
a supporting structure,
a form carried by the supporting structure, on which a wire is to be wound for forming a winding, and
a rotatable unit, rotatably supported by the supporting structure around a central axis of the form, for winding the wire around said form in order to form the winding,
wherein said form comprises two form sections movable toward and away from each other in a direction orthogonal to the form axis.
In the apparatus of the above indicated type which have been made heretofore, the relative displacement between the two form sections along a direction orthogonal to the form axis is driven manually or with the aid of a motorized auxiliary unit, when the apparatus is inoperative, by actuating adjustable screws provided on the form in order to adjust the size of the form and hence the windings obtained thereby. This operation is relatively troublesome and further implies a loss of productivity of the apparatus, due to the increase in the apparatus down-time.
SUMMARY OF THE INVENTION
It is an object of the invention to overcome the above-mentioned drawback. The invention achieves this object by providing an apparatus of the above indicated type, characterized in that it includes motorized means for driving the relative movement of the two form sections which are adapted to be activated even while the winding unit is being rotated.
The inventor has discovered with surprise that the adjustment of the form size while the winding operation is being carried out may become a desirable feature, in view of obtaining a coil formed by turns of variable length. With this feature, it is possible, for example, to provide a coil so as to save wire length where possible and also improve the performance of an electric motor obtained thereby. Realizing the existence of this problem and providing the above indicated solution represents the essence of the present invention. None of the apparatus made heretofore is able to adjust the form size while the winding is being formed, as it is possible with the apparatus according to the invention.
In a preferred embodiment, the two form sections are slidably mounted along the direction of their relative movement on a frame carried by said supporting structure, and said motorized means for driving the movement of the form sections includes a rod arranged along the form axis and having two opposite rack-like surfaces which mesh with two sprockets driving a synchronous and symmetric movement of the two form sections with the aid of two respective screw-and-nut systems, the apparatus further comprising means for driving movement of said rod along its axis.
The invention is also directed to the winding forming method which is carried out by the apparatus according to the invention, whose main feature lies in that a relative movement of the two form sections is driven, in order to vary the form size, while the winding operation is being carried out.
REFERENCES:
patent: 3346021 (1967-10-01), Ross
patent: 3672040 (1972-06-01), Arnold
patent: 5251678 (1993-10-01), Orecchia
patent: 5647405 (1997-07-01), Fichtner et al.
patent: 572 291 (1976-01-01), None
patent: 37 29 289 A1 (1989-03-01), None
Edwards Dona C.
Fish & Neave
Jackson Robert R.
Larson Lowell A.
Pavesi S.r.l.
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