EP0039276B1 - Method for winding several turns of wire on a case, in particular for the winding of deviation rings for cathode ray tubes, machine for carrying out the method and winding obtained by the method - Google Patents

Description

The present invention relates to a method of winding several turns of wire on a core, in particular for winding deflection rings for cathode ray tubes. It also relates to a machine for implementing the method according to the invention and a winding specially obtained using the method of the invention.

For many electromagnetic devices, electrical wire windings coated with insulation are used comprising several turns of wire wound on a magnetic core.

Thus, for cathode ray tubes, deflection rings are used which are constituted by a magnetic ferrite core having substantially the shape of a truncated cone flared in a bowl, on which core are wound a bundle of turns. To allow winding on winding machines, the ferrite ring is initially divided into two parts, and each half-core thus having an open structure can be wound on automatic winders, each half-ring being able to be held on the machine. wind by one of its side edges.

In the windings currently produced by machine using a process of the aforementioned type, as is apparent from document FR-A-2 351 903 (see preamble to claim 1), the turns are wound substantially along radial planes, that is to say, passing through the axis of the truncated cone of the ring. Such an orientation of the turns is not advantageous on the electromagnetic level, not corresponding to the best deflection efficiency of the cathode beam.

Of course, one can seek to improve the performance of the deflection rings by winding each turn on each half-ring under the best orientations, and for example by performing such winding by hand. However, these are extremely long and costly operations which are not industrially applicable.

The object of the invention is to allow, without reducing the working speed of the winders of a machine, to obtain wound parts, in particular as deflection rings for cathode ray tubes, in which each wound turn has been according to the optimal orientation calculated for the function that the wound piece must fulfill.

Thus, for example, in the case of deflection windings for cathode-ray tubes having turns wound on each half-ring in the shape of a truncated cone flared in a bowl, said turns may be inclined on radial planes symmetrically on either side of the median plane of each half-ring with two bundles of symmetrical turns clearly spaced from the median plane on the small edge of the bowl and on the contrary substantially contiguous on the large edge.

The method of the invention making it possible to reach these objects is characterized in particular in that the winding plane of each turn is determined by the position in rotation α of the segment to be wound around a first axis X and by the rotational position d of the reel around a second axis Y which obliquely intersects the first axis X in the vicinity of the segment to be wound, the reel rotating around a third axis Z directed obliquely to the axis Z and also passing through the segment to be wound, which is fixed by its median plane, and the rotational positions α, β of the support and of the reel being controlled in order to obtain the desired successive planes of winding the turns around the core .

Preferably, in practice, the axes X and Y are chosen to be fixed relative to one another and directed substantially orthogonally, as are the axes Z and Y.

According to another characteristic of the method of the invention, each core to be wound is fixed, such as a substantially frustoconical ferrite half-ring, on its support, substantially in its median plane and on its small edge, and a perfectly symmetrical winding of turns inclined with respect to this median plane by choosing winding programs with symmetrical angles α and β.

• - un bâti,
• - lesdits axes X, Y et Z étant dirigés obliquement les uns par rapport aux autres. De façon pratique et avantageusement, les axes X et Y d'une part, et Y et Z d'autre part, sont disposés sensiblement orthogonalement.

The invention also relates to a machine allowing the implementation of the mentioned process, this machine is characterized in that it comprises:

• - a frame,
• - Said axes X, Y and Z being directed obliquely relative to each other. Conveniently and advantageously, the axes X and Y on the one hand, and Y and Z on the other hand, are arranged substantially orthogonally.

• - des premieres moyens de commande permettant de choisir à chaque instant la position angulaire n et de faire tourner pas à pas ledit support de noyau autour de l'axe X,
• - des seconds moyens de commande permettant de choisir à chaque instant la position angulaire d et de faire tourner pas à pas ladite colonne autour dudit axe Y,
• - et des moyens de conjugaison desdits premier et second moyens de commande pour obtenir les différents plans successifs voulus d'enroulement des spires autour du noyau.

According to another characteristic of the machine which is the subject of the invention, it further comprises:

• first control means making it possible to choose at any time the angular position n and to rotate said core support step by step around the X axis,
• second control means making it possible to choose at any time the angular position d and to rotate said column step by step around said axis Y,
• - And means of conjugation of said first and second control means to obtain the various desired successive planes of winding the turns around the core.

These conjugation means are advantageously constituted by a microprocessor or computer memorizing the numbers of turns to be wound around the core for each value of the angles α and β determined conjugate above. winding program thus established then controls by any known means existing in the art and within the reach of the technician the various motors of the machine, namely the winding motors and the stepping motors for determining the angle α of rotation of the support around the X axis and the stepper motors for determining the angle of rotation of the column around the Y axis.

• la fig. 1 est une vue schématique en perspective d'une machine conçue selon l'invention,
• la fig. 2 est une vue de côté faite selon la flèche Il de la fig. 1,
• la fig. 3 est une vue par dessus de la machine faite selon la flèche III de la fig. 1,
• la fig. 4 est une vue d'une demi-bague ferrite bobinée selon l'invention, cette vue étant faite par dessus côté de la petite tranche sensiblement selon la flèche IV de la fig. 5,
• La fig. 5 est une vue de l'intérieur de la demi-bague de la fig. 4 faite sensiblement selon la flèche V de la fig. 4 et rabattue dans le plan de figure.
• La fig. 6 montre comme la fig. 4 une demi-bague ferrite bobinée selon l'art antérieur.
• La fig. 7 montre comme la fig. 5 la demi-bague de la fig. 6.
• Les fig. 8 et 9 sont deux schémas angulaires illustrant comment peuvent être mesurés les angles α et β de rotation respectivement du bras support de la machine et de la colonne support des enrouleurs.

The invention will appear more clearly with the aid of the description which follows, made with reference to the appended drawings in which:

• fig. 1 is a schematic perspective view of a machine designed according to the invention,
• fig. 2 is a side view taken along the arrow II in FIG. 1,
• fig. 3 is a top view of the machine made according to arrow III of FIG. 1,
• fig. 4 is a view of a ferrite half-ring wound according to the invention, this view being taken from above side of the small section substantially according to arrow IV of FIG. 5,
• Fig. 5 is a view of the interior of the half-ring of FIG. 4 made substantially according to arrow V of FIG. 4 and folded down in the plane of the figure.
• Fig. 6 shows as in fig. 4 a ferrite half-ring wound according to the prior art.
• Fig. 7 shows as in fig. 5 the half-ring of fig. 6.
• Figs. 8 and 9 are two angular diagrams illustrating how the angles α and β of rotation of the support arm of the machine and of the support column of the reels can be measured respectively.

According to the embodiment illustrated in the drawings, the machine comprises a frame 1 with a base 2 supporting an upright 3 in which are mounted two supports 4 ₁ , 4 ₂ orientable at an angle a respectively around axes X ₁ and X ₂ substantially horizontal like the plane of the base 2 in the example illustrated. For their rotation around the axes X ₁ and X ₂ , the supports 4 ₁ , 4 ₂ are driven by an electric motor with stepping control 5 whose output shaft 6 drives two pulleys 7 ₁ , 7 ₂ connected by a belt 8. The pulleys 7 ₁ , 7 ₂ are wedged on the shafts 9 ₁ , 9 ₂ for driving the support arms 4 _i , 4 ₂ .

At 10, a flywheel was identified allowing manual setting of the angle a and mounted at the end of the axis of the motor 5.

The machine further comprises a column 11 which supports, in the example illustrated, two conventional reels whose arms marked 12 ₁ , 12 ₂ are driven in rotation and simultaneously around the two parallel axes Z _i , Z ₂ , horizontal in the illustrated embodiment. The arms 12 ₁ , 12 ₂ are driven by a motor, the cover of which can be seen at 13.

On the other hand, the whole of the column 11 is mounted rotating at an angle β around a fixed axis Y relative to the frame and substantially vertical, that is to say perpendicular to the base 2 in the example illustrated . The rotation of the entire column around the Y axis is obtained by means of an electric motor with stepping drive visible at 14 in FIG. 2.

It will be noted that the Y axis passes substantially at the locations where the parts 4 ₁ , 4 ₂ can be presented at the end of the supports to be wound such as the frustoconical ferrite half-ring illustrated at 15 and mounted fixed on the support 4 ₂ .

Obviously, the winding arms 12 ₁ , 12 ₂ are also positioned on the column 11 so that the winding plane cuts the piece to be wound, allowing the winding. At 16, the circle described by the winding end of the arm 12 ₁ rotating around its axis of rotation Z _{i has materialized} , this circle 16 obviously being contained in the winding plane.

The comparison of the figures and more particularly that of FIGS. 1, 8 and 9 makes it possible to understand the winding process carried out according to the invention.

Fig. 8 shows, seen from the X axis, the angle a of rotation of the arm 4 supporting the part 15. The angle α for ease of reference can be identified with respect to a straight line A 'A vertical, parallel to the Y axis and passing through the X ₁ and X ₂ axes.

Likewise, fig. 9 represents, seen from the axis Y the angular orientation d of the column 11 around said axis Y. For questions of ease, the angle β can be located from the line B 'B which is none other in the example illustrated as the projection on the plane of the base 2 of the axes X _I , X ₂ .

On the other hand, according to an advantageous embodiment of the invention, the half-ring 15 will be supported at the end of the support 4 ₁ , 4 ₂ substantially in its median plane and on its small edge. In practical terms, the fixing can be done by means of a comb 17 made of plastic material, bonded to the frustoconical ferrite half-ring 15 and comprising teeth 18 in which the coiled turns 19 will be housed, thus ensuring good positioning. and avoiding any further slipping. The support arm 4 ₂ may be provided at its end with a clamp which will receive the middle part of the comb.

With such a fixing of the half-ring 15 in its median plane and by its small edge, it is then possible to produce a perfectly symmetrical winding of inclined turns 19, 19 '(see fig. 4 and 5) relative to the median plane 20, the angle of inclination of the turns being able to be chosen at each moment, the winding program being chosen, that is to say the angles a and β conjugate used at each moment, and the number of turns to be produced for each value of the angles α and β determined conjugate above.

On the other hand, it immediately appears that, given the fixing in the middle position of the ring, we will obtain perfectly symmetrical turns 19, 19 'if we simply take care to match opposite values of the angle (a) to opposite values of the angle (β) and to choose identical winding programs for respectively opposite measurements of the conjugate angles α and β.

If we now refer to figs. 6 and 7, we sees that according to the prior art, the core constituted by a ferrite half-ring 21 was held by a lug 22, for example glued in the vicinity of an end edge of the half-ring 21, and on the half-ring thus held, coils were wound by means of winding arms such as 12 ₁ , 12 ₂ in radial planes passing through the axis 24 of the half-ring 21. These different radial winding planes were obtained by pivoting the arms reels around the axis 24 of the ring held fixed.

From an electromagnetic point of view, the windings thus obtained are much less effective than when the turns are arranged in inclined planes as the invention allows.

Claims (10)

1. Method of winding a plurality of turns of wire onto a core, particularly for winding the deflection coils of cathode ray tubes, said method using at least one winder comprising a winding arm (12_i, 12₂) rotating about at least one segment (15) of the coil to be wound mounted on a carrier (4₁, 4₂) adapted to be orientated, characterized in that the winding plane (16) of each turn is determined by the rotational position (α) of the segment (15) to be wound about a first axis (X) and by the rotational position (β) of the winder about a second axis (Y) intersecting the first axis (X) obliquely in the neighborhood of the segment (15) to be wound, the winder rotating about a third axis (Z) directed obliquely with respect to the axis (Y) and further passing through the segment (15) to be wound which is fixed at its central plane (20), and the rotational position (α, β) of the carrier and of the winder being controlled in a manner to obtain the desired successive winding planes of turns about the core.

2. Method according to claim 1, characterized in that said axes (X) and (Y) are selected fixed with respect to each other and substantially perpendicularly directed.

3. Method according to claim 1 or claim 2, characterized in that the axes (Z) and (Y) are selected fixed with respect to each other and directed substantially perpendicularly on each other.

4. Method according to any of the preceding claims, characterized in that each core (15) to be provided with a winding, such as an essentially frusto-conical ferrite ring, is mounted on its carrier (4₁, 4₂) substantially in its central plane (20) and at its minor base, and that a perfectly symmetrical winding (19, 19') of turns which are inclined with respect to this central plane (20) is formed by associating with opposite values of the angle (a) respectively opposite values of the angle (β) and by selecting identical winding programs for opposed values of the angle (_rt).

5. Machine for performing the method of any of the perceding claims, characterized in that it comprises, in combination:

- a stand (1),

- at least one core carrier (4₁, 4₂) adapted to be orientated along an angle (α) about an axis (X) with respect to the stand,

- at least one post (11) carrying at least one winder (12₁, 12₂) rotatably mounted on said post (11) about an axis (Z) which is fixed with respect to said post,

- said post (11) being rotatably mounted along an angle (β) within the stand (1) about an axis (Y) which is fixed with respect to said stand, and

- said axes (X, Y and Z) being directed obliquely to each other.

6. Machine according to claim 5, characterized in that it further comprises first control means (5, 10) permitting to select the angular position (α) at any time and to step-wise rotate said core carrier (4), 4₂) about the axis (X), and second control means (14) permitting to select the angular position (β) at any moment and to step-wise rotate said post about said axis (Y), and

- means for combining said first (5) and second (14) control means to obtain the desired successive winding planes of the turns about the core.

7. Machine according to claim 5 or claim 6, characterized in that the axes (X and Y) are arranged substantially perpendicularly with respect to each other.

8. Machine according to any of claims 5 to 7, characterized in that the axes (Y and Z) are arranged substantially perpendicularly with respect to each other.

9. Machine according to any of claims 5 to 8, characterized in that at least two axes (X_i, X₂) and two axes (Z_I, Z₂) respectively parallel to each other within each group (X and Z) are provided and combined with each other in such a manner that at least two identical winding operations can be performed simultaneously.

10. Winding obtained by the method of any of claims 1 to 4, the deflection coils for cathode ray tubes having turns (19 and 19') wound on each half-ring (15) in the form of a truncated cone widening in the shape of a basin, said turns being inclined with respect to radial planes symmetrically on both sides of the central plane (20) of each half-ring, the two bundles (19 and 19') of symmetrical turns being spaced from the central plane (20) at the minor base of the basin, but substantially adjacent at the major base.

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