Wireworking – Article making or forming – Forms and frames
Reexamination Certificate
1999-06-02
2001-09-04
Larson, Lowell A. (Department: 3725)
Wireworking
Article making or forming
Forms and frames
Reexamination Certificate
active
06283169
ABSTRACT:
The invention relates to an apparatus for the winding of coils or coil groups, in particular for stators of electric motors.
Coils or coil groups for stators of electric motors are normally wound around winding templates by means of a so-called flyer and are then put down in a draw-in tool for drawing the coils or coil groups into a stator core assembly. As a rule, such a flyer consists of a rotating arm having a wire guide for the coil wire. The wire end is held by a separate wire holder, so that the coil wire is drawn off from a wire supply during the rotation of the flyer and runs through the wire guide of the flyer during the winding.
In order to be able to produce a coil having another wire, for example having a different wire diameter or a different material compared with a coil which has already been wound, in the known apparatuses the appropriate wire has to be removed from the wire feed and a new wire has to be drawn in. The drawing-in of the wire is carried out manually and takes a certain amount of time. This results in delays in the production and thus leads to increased costs.
The object of the invention is to propose an apparatus by means of which such an expenditure is avoided.
Starting from an apparatus of the type mentioned in the introduction, this object is achieved by in which a second flyer and a second separate wire guide are provided.
A wire which is different from the first wire may be drawn into the wire guide of the second flyer. A coil with a second wire having, for example, a different diameter and/or a different material may therefore be wound at any time by means of the second flyer. The simultaneous winding of two coils with both flyers is therefore also readily conceivable. In this respect, the apparatus according to the invention offers corresponding advantages even when the same wire is used for both flyers.
Thus, in an advantageous embodiment, the second flyer is designed to be rotatable about the same geometric axis as the first flyer. The common rotary axis of the two flyers is preferably arranged centrally to the winding template, so that, during the winding of the coils, the wire is in each case drawn in at as uniform a speed as possible.
Furthermore, in an advantageous development of the invention, a winding disk is arranged in the second wire guide. Such a winding disk enables the second flyer to be arranged outside the first flyer in the radial direction with respect to the common rotary axis of the two flyers and at the same time enables the second wire guide to be arranged outside the rotary axis and outside the first wire guide.
In this case, the first wire guide is preferably arranged to run at least partly on the rotary axis of the flyers. In the region of the first flyer, the wire is deflected from this axis in the radial direction. Therefore the region which has to be kept free of other machine components for the rotation of the first wire in the first wire guide is limited to the immediate vicinity of the winding template.
The winding disk, which is arranged in the second wire guide, therefore results in the advantage of arranging the second wire guide continuously outside the rotary axis of the two flyers, so that the courses of the two wires cannot cross. At the same time, the rotary arms of the two flyers may be designed with a fixed radius, the first flyer having a smaller radius.
In this case, said winding disk is preferably mounted in a rotatable manner, so that it can follow a pull of the wound-on wire by means of a rotation.
During the rotation of the second flyer, a supply winding is therefore always put onto the winding disk. In this case, there are various means of operating the second flyer during the winding of coils. Thus the wire, as in the case of the conventional apparatuses or the first flyer, may be fixed by a separate wire holder, while the second flyer rotates. In the process, a coil is wound on the winding template, while at the same time a corresponding supply winding is put on the winding disk in the second wire guide.
To unwind this supply winding, the direction of rotation of the second flyer may be reversed. This means that, for one of the following coils, the wire is first of all unwound from the winding disk. The reversal of the direction of rotation of the second flyer should be effected at a moment at which the receiving capacity of the winding disk is not exceeded.
A further means of operating the second flyer consists in attaching a supply winding having a defined number of turns to the winding disk before a coil is wound. This may be effected by a wire holder being provided at the rotary arm of the second flyer. Once the supply winding having the predetermined length has been put onto the winding disk, the desired coil, with the direction of rotation of the second flyer reversed, may then be wound in the conventional manner by the wire end being transferred from the wire holder of the second flyer to a separate wire holder and by the flyer winding a coil onto the winding template in the usual manner.
Since the winding disk has a fixed circumference, but the winding template may have different coil circumferences in order to produce coils of different size, the wire length which is wound around the winding disk with a certain number of turns is not always identical to the wire length which is required for the same number of turns for winding a coil on the winding template. If the circumference of the winding disk is smaller than that of the winding template, a factor which corresponds to a greater number of turns, this is compensated for by a winding disk rotating in the opposite direction to the second flyer, so that the requisite wire quantity is subsequently delivered without problem.
However, if the circumference of the winding disk is larger than the circumference of the winding template and/or of the coil to be wound, length compensation may be effected by the winding disk being rotated in the same direction of rotation as the flyer, the excess wire quantity being delivered again to the wire guide. To this end, appropriate means for drawing in the wire against the feed direction are advantageously provided. These means for drawing in the wire may be realized, for example, by means of compensating rollers, around which the wire is put in a serpentine manner, at least one of these rollers being movable against a restoring force.
REFERENCES:
patent: 3065771 (1962-11-01), Possis et al.
patent: 3980243 (1976-09-01), Schulman
patent: 4751946 (1988-06-01), Eminger
patent: 5265814 (1993-11-01), Stralka
patent: 24 34 480 (1976-01-01), None
patent: 0 741 442 (1996-11-01), None
Hiroyuki, “Patent Abstracts of Japan”, Pub. No. 59230451, Pub. Date Dec. 12, 1984.
Crowell & Moring , L.L.P.
Larson Lowell A.
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