EP0156674B1 - Process for positioning and holding ferrite halves for magnetic cores and centering device for carrying out the process - Google Patents

Process for positioning and holding ferrite halves for magnetic cores and centering device for carrying out the process Download PDF

Info

Publication number
EP0156674B1
EP0156674B1 EP85400293A EP85400293A EP0156674B1 EP 0156674 B1 EP0156674 B1 EP 0156674B1 EP 85400293 A EP85400293 A EP 85400293A EP 85400293 A EP85400293 A EP 85400293A EP 0156674 B1 EP0156674 B1 EP 0156674B1
Authority
EP
European Patent Office
Prior art keywords
ferrite
centering
centering device
plate
tongs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85400293A
Other languages
German (de)
French (fr)
Other versions
EP0156674A1 (en
Inventor
Jean Rousseau
Jean-Pierre Fourche
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Videocolor SA
Original Assignee
Videocolor SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Videocolor SA filed Critical Videocolor SA
Priority to AT85400293T priority Critical patent/ATE47251T1/en
Publication of EP0156674A1 publication Critical patent/EP0156674A1/en
Application granted granted Critical
Publication of EP0156674B1 publication Critical patent/EP0156674B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/236—Manufacture of magnetic deflecting devices for cathode-ray tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/236—Manufacture of magnetic deflecting devices
    • H01J2209/2363—Coils
    • H01J2209/2366—Machines therefor, e.g. winding, forming, welding, or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core

Definitions

  • the present invention relates to a method of positioning and gripping a half ferrite for a magnetic core, in particular for a cathode ray tube deflector. It also relates to a centralizer implementing the method according to the invention. The invention finds application in particular in the field of manufacturing color television tubes.
  • the image is obtained by electronic deflection produced by a magnetic deflector.
  • a magnetic deflector conventionally comprises two coils whose fields are orthogonal respectively to create the line scan and the frame scan.
  • the deflector has a magnetic core to strengthen the magnetic field in the deflection region.
  • one of the two windings is toroidal in shape and is constituted by a stack of turns mounted on the magnetic core.
  • the toroidal winding is produced in two halves on two half ferrites which, when assembled together, constitute the wound magnetic core.
  • the magnetic core consists of an initially fractured ferrite - according to a relatively geometrical break plane.
  • each half ferrite is wound and the two half ferrites from the same ferrite are connected to each other and fixed by means of spring metal parts. It clearly appears that the magnetic axis of the core must be known with the greatest possible precision in order to achieve a suitable winding.
  • the magnetic core comprises on either side of the breakage plane precisely machined grooves which allow a marked capture of the ferrite so as to produce precise windings.
  • the grooves being made along the entire ferrite, these operations are relatively complex and significantly weaken the ferrite.
  • the removal of material is also relatively considerable which has the effect of modifying the geometry of the field lines.
  • the complexity of the problem to be solved comes from the accuracy sought which is of the order of a tenth of a millimeter and from the relative imprecision of the ferrite obtained by powder sintering.
  • the baking which gives ferrite its final magnetic properties causes a shrinkage of 20 to 30% of the initial dimensions.
  • the break plane must be a plane of symmetry and the broken surfaces are not and must not be geometrically plane so as to allow their precise reassembly.
  • Another type of solution according to the prior art consists in finding the magnetic axis of the ferrite by means of a particular assembly.
  • the ferrite is mounted on a succession of truncated cones tangent internally to its surface and this centering is transferred to plastic parts positioned on the assembly and glued at this stage on either side of the ferrite.
  • the plastic parts are then used as a reference for the winding operations and for setting the deflector. They also serve as gripping means for pliers for any manipulation of the ferrites. This type of solution is relatively expensive and moreover gives results which depend on the care taken in the operations of bonding plastic parts.
  • the ferrite carries on its annular edges notches of small dimensions which will serve as position markers for arranging the plastic parts.
  • the precision of the positioning operation depends on the external diameter of the ferrite support, known assemblies consisting of a fixed stop on which the notch is supported, a semi-circular bearing on which comes an external diameter of the ferrite and a movable stop coming to press on the opposite notch of the ferrite.
  • Such solutions require a preliminary sorting of the ferrites into homogeneous classes of precision and moreover do not allow the automation of the deflector production lines.
  • the object of the invention is to make it possible to restore the axis of the ferrite according to its geometric qualities, by avoiding sorting into different classes of ferrites and by allowing the manufacturing process to be automated.
  • the present invention relates to a method of positioning and gripping a half-core obtained by rupture along an axial plane of a ferrite magnetic core with symmetry of revolution, in particular for a deflector of a cathode ray tube, this half-core comprising, on its edges created by the rupture, means for locating the position of its axis of revolution, characterized in that the half-core is first applied to a positioning plate bearing on centering elements cooperating with said locating means, which are notches made during the molding of the core, then mobile centering means, which move perpendicular to the main plane of the positioning plate, are applied to the half-core to make its axis of revolution coincide with a centering axis of the positioning plate, and the half -core thus positioned is gripped by a gripping member which transfers the information from the centering axis to a geometric element of the gripping member.
  • a half ferrite is shown.
  • the general shape of the ferrite is a truncated cone.
  • the ferrite therefore consists of two vertices, the upper one consisting of a small circular crown, the other lower consisting of a large circular crown.
  • Ferrite is obtained by molding and sintering a suitable magnetic material.
  • a first method consists, by special mechanics, of winding wire with a shuttle which circulates around the flanks of the ferrite inside and outside of it.
  • the invention relates to another type of manufacturing according to a second method.
  • the ferrite is previously broken into two substantially equal halves.
  • each half ferrite is wound on a special machine then the two half ferrites wound are re-paired and assembled so as to constitute a toroidal winding on ferrite.
  • the winding must be carried out along a known magnetic axis which depends in particular on the geometry of the ferrite.
  • the half ferrite must be placed on the winder so that the position of the magnetic axis is suitable. It is therefore necessary that each half ferrite keeps the memory of the position of the magnetic axis of the ferrite. Since the ferrite is a body of revolution, the central axis of the ferrite can be chosen as the magnetic axis of the ferrite wound in any plane passing through diameters of the upper and lower edges of the truncated cone ferrite.
  • the break plane By making incipient fractures at the intersection of the edges of the ferrite and the future break plane.
  • the geometrical location of these fracture primers makes it possible to memorize the position information of the central axis of the ferrite.
  • the incipient fractures are produced by notch molding in the manufacture of ferrite.
  • FIG. 1 a half ferrite 1 is shown, the central axis 3 of which is in the break plane 2. It is noted that the position of this axis 3 is midway between the notches 4 and 6 of the semicircle constituting the upper edge and notches 5 and 7 of the lower edge.
  • the half ferrite thus carries the position information of the central axis 3.
  • the fractured edges which are shown smooth in the breakage plane 3, are in fact fairly irregular surfaces since they come from a fracture of a material sintered. This characteristic will require that the half ferrites coming from the same broken ferrite be re-paired so that the irregularities of the fractured edges correspond.
  • the invention also makes it possible to largely overcome the ovalization defects of these vertices on which the prior alignment or gripping methods are dependent.
  • FIG 2 there is shown a magnetic core or ferrite 13 consisting of two half ferrites with notches 8 and 9.
  • the magnetic axis 3 belongs to the break plane separating the two half ferrites.
  • Each half ferrite has a notch 10 or 11 formed in the conical body of the ferrite.
  • the assembly of the two half ferrites is fixed by a piece 12 of removable spring steel, installed in the notches 10, 11 on each fractured side of the reconstituted ferrite.
  • Other elements for locating the position of the half ferrite are provided to replace the notches. These elements include lugs arranged on either side of the broken edges of the half ferrite towards the inside or outside of the concavity of the half ferrite as the case may be. These pins have dimensions determined according to the gripping member used in the method according to the invention, in order to allow a marked gripping of the half ferrite.
  • FIG 3 there is shown a whole ferrite mounted with ears.
  • This figure illustrates an embodiment of the prior art.
  • Each ferrite is fitted with geometric reference and gripping ears which are glued to its sides.
  • the break plane 20 of the ferrite 14 is parallel to the planes in which the two ears 16a and 16b are located.
  • An ear 16a or b has three holes 17-19 which make it possible to know with precision the position of the central axis 15 and a future fixing of the half ferrite to a winder.
  • the ear is made of plastic material which is glued to the ferrite.
  • the centering device comprises a plate 21, 22 constituted by the plate 22 proper and a base 21.
  • the plate 22 has a vertical face plane on which are arranged centering elements 29, 30, 33-36. These centering elements are first of all tabs 29 and 30 intended to come to bear in the high notches of the half ferrite 23 placed in the centralizer. It also has tabs 33, 34 which come in the lower notches of the half ferrite 23. Finally, they include needles 35 and 36 which ensure the positioning along the axis 40 of the half ferrite 23.
  • the bar 26 which actuates the V 27, 28 realizes a centering along a first reference axis of the half ferrite 23 on the desired axis 40.
  • the V 26, 28 is movable along the direction 37.
  • the ends 27 and 28 of this lower V come to bear on the edges of the lower circular crown of the half ferrite 23.
  • the two upper half V 24 and 25 are translated along directions 38 and 39 so as to apply their ends 31 and 32 to the upper crown of the half ferrite 23.
  • This last movement makes it possible to correctly apply the half ferrite to the plate 22, the support on needles 35, 36 by gravity.
  • the half ferrite 23 rests on the needles 35 and 36 so as to properly adjust its height relative to the base 21. In this position the ferrite is centered on the axis 40 which means that its magnetic axis is coincident with the axis 40 drawn on plate 22.
  • the geometrical element which serves to memorize the position information of the magnetic axis 40 of the half ferrite is in a preferred embodiment constituted by two parallel edges of a plate constituting the body of the clamp.
  • the geometric storage element consists of three holes in the body of the clamp whose positions relating to the centering elements of the centralizing plate are known. This entry operation is the second main step of the method according to the invention.
  • the clamp is removable.
  • the clamp grasps the half ferrite 23 along the axis A.
  • This clamp comes between the two upper half Vs 24 and 25 grip the ferrite in a plane perpendicular to the vertical reference plane of the plate 22.
  • Mechanical guide members not shown in FIG. 4 are provided so that this gripping plane perpendicular to the plane 22 also contains the centering axis 40. It is then necessary for the gripper, not shown, to include a mechanical reference element which contains both the axis A and the axis 40. This can be achieved by a plate of which at least one of the faces contains the generated plane. by axes A and 40.
  • FIG. 5 there is shown a second particular embodiment according to the invention.
  • the centralizer mainly comprises a base 50 and a plate 73.
  • the base 50 carries a carriage 51 movable in translation on two rails 52 by means of an endless screw 53 movable under the action of a motor 54.
  • the carriage carries the driving elements of the half Vs shown in Figure 4 taken described.
  • the half ferrite 63 is gripped by its left edge by a clamp 65.
  • the plate 73 carries centering elements on the side of the edge that is not gripped by the ferrite.
  • a tab 64 helps with centering by entering the corresponding notch on the edge of the half ferrite.
  • These centering elements are completed by a lower tab and a needle which thus completes the triplet already described in FIG. 4.
  • a clamp 65 consisting mainly of a plate 65a disposed between two slides 70, 71
  • the clamp has a positioning and gripping part 65b.
  • the clamp 65 has been shown schematically.
  • a member 72 for locking the clamp keeps the clamp in position on the plate.
  • the carriage 51 is in the retracted position.
  • the half ferrite 63 in the region of the axes A and 40.
  • the carriage 51 is advanced by the screw 53 and the motor 54 along the axis A until to a fixed stop.
  • a motor 55 actuates the screws 59, 60 and 69 by means of a tilting stirrup 58, 57.
  • the tilting stirrup 57, 58 is pivotally mounted around a horizontal axis perpendicular to the direction A of advancement so as to distribute the thrust action between the upper and lower Vs. It carries a fork 58 which switches along an axis close to the vertical and which distributes the thrust between the two upper V-halves.
  • the motors 54 and 55 fitted with torque limiters like the limiter 56 maintain pressure on the half ferrite 63, the positioning of the ferrite on the plate is finished at this time.
  • the clamp is put into action. It comprises three positioning elements which, in a preferred embodiment, are three centering pins 83, 84 visible for two of them in FIG. 6.
  • the clamp also carries a gripping means 68 which makes it possible to maintain, when it is activated by means 67, the half ferrite on the clamp. This activation is carried out after the half ferrite has been positioned on the clamp-plate assembly.
  • the means 67 for activating the input means 68 is manual. It is either accessible to an operator by means of a screwdriver if the input means is mechanical or of a switch if the input means is electric like an electromagnet or can be operated by an external automation not shown in the figure 5.
  • the centering elements are activated by mechanical control means 66, an exemplary embodiment of which is described below.
  • This means 66 is also maneuverable by an operator or an external automation or centering device of the invention. The centering and the fixing being carried out, the carriage 51 is moved back.
  • the locking device 72 is deactivated and a manual or automatic manipulator can withdraw the clamp 65 from the rails 70, 71.
  • FIG. 6 there is shown a particular embodiment of a clamp adapted to the invention.
  • a clamp comprises a plate 80 on which is mounted a support 81 of the screws 86 and 87 for activating the gripping and centering elements.
  • the plate 80 is used, once the half ferrite centered and gripped according to the method of the invention, to transport anywhere the position information of the central axis of the gripped half ferrite centered.
  • On the tray is fixed a strap 82 made by a metal tape fixed on the one hand by a screw 90 in the upper part of the tray and at the lower part by a screw 89 on a carriage 88 movable on the screw 87.
  • the screw 87 When the screw 87 is operated the carriage 88 moves forward or backward depending on the direction of rotation of the screw. It is understood that a tension can therefore be applied to the strap 82.
  • the clamp also includes pins 83 and 84 movable in translation along a horizontal axis according to the figure, that is to say an axis parallel to the axis of the screws 87 and 86. These pins are intended to come s' press on the external face of the half ferrite installed on the plate 80 so that the tightening of the strap 82 allows firm application of the external face of the half ferrite on the pins 83, 84 for centering.
  • the tightening of the strap 82 does not take place until after the screw 86 has allowed the operation of the pins 83 and 84 which complete the effect of the centering elements arranged on the plate of the Figure 5.
  • the screw 86 operated allows, by the caliper 85, to distribute a centering force through rods 91 and 92 on the pins 83 and 84 as described above for the caliper 57 , 58 tilting in FIG. 5.
  • a push-button 93 allows the adjustment to be blocked independently of the withdrawal of the torque applied to the screw 86 by the automatic screwdriver.
  • the automatic screwdriver which operates the screw 87 then allows the tightening of the strap 82 as just described.
  • the clamp carrying the half ferrite can be used for different purposes, in particular for winding the half ferrite.
  • the position of the magnetic axis of the half ferrite is known with precision as a function in particular of the plane in which the plate 80 is located.
  • a clamp of this type is not easily suitable for gripping the half ferrite elsewhere than on an edge of the break plane.
  • the clamp comprises means for magnetizing the ferrite so as to allow a removable, controllable attachment of the half ferrite to the clamp.
  • the clamp has an electromagnet which exerts a force for attaching the half ferrite to its clamp.
  • the centering device comprises centering members for the two edges of the half ferrite.
  • the clamp can be carried by the centering device by means of a shaft introduced by a bore in the plate with a vertical plane containing the centering axis 40.
  • This shaft secured to the plate 80 perpendicular to its plane is taken in a removable fixing means so as to make the clamp temporarily secured to the centralizer proper during the centering and gripping operations.
  • the locking device 72 of the clamp on the plate then acts on this fixing means and is controlled as it was seen above according to the method according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Compounds Of Iron (AREA)

Abstract

The present invention concerns a process for the centering of position and grasping of semi ferrites and the invention also proposes a centering device that comprises a table, the tray of which carries centering elements of the semi ferrite applied on the tray by V-shaped forms and a movable clip for grasping the semi ferrite once it has been centered, wherein the clip thus acts to memorize the position of the magnetic axis of the semi ferrite, especially for winding operations with a view to the manufacture of a television tube deflector.

Description

La présente invention concerne un procédé de positionnement et de saisie d'un demi ferrite pour noyau magnétique notamment pour un déviateur de tube cathodique. Elle concerne aussi un centreur mettant en oeuvre le procédé selon l'invention. L'invention trouve application notamment dans le domaine de la fabrication des tubes de télévision en couleur.The present invention relates to a method of positioning and gripping a half ferrite for a magnetic core, in particular for a cathode ray tube deflector. It also relates to a centralizer implementing the method according to the invention. The invention finds application in particular in the field of manufacturing color television tubes.

Dans de tels dispositifs, l'image est obtenue par déviation électronique réalisée par un déviateur magnétique. Un déviateur magnétique comprend classiquement deux bobinages dont les champs sont orthogonaux respectivement pour créer le balayage ligne et le balayage trame. Le déviateur comporte un noyau magnétique pour renforcer le champ magnétique dans la région de déviation. Dans certains procédés de construction de déviateurs, l'un des deux bobinages est de forme torique et est constitué par un empilement de spires monté sur le noyau magnétique. Dans un mode de réalisation particulière de l'art antérieur, le bobinage torique est réalisé en deux moitiés sur deux demis ferrites qui, une fois rassemblés fixés, constituent le noyau magnétique bobiné. Selon de tels procédés, le noyau magnétique est constitué d'un ferrite initialement fracturé - selon un plan de casse relativement peu déterminé géométriquement. Puis, chaque demi ferrite est bobiné et les deux demis ferrites issus d'un même ferrite sont raccordés l'un à l'autre et fixés par le moyen de pièces métalliques en ressort. Il apparaît nettement que l'axe magnétique du noyau doit être connu avec la plus grande précision possible afin de réaliser un bobinage convenable.In such devices, the image is obtained by electronic deflection produced by a magnetic deflector. A magnetic deflector conventionally comprises two coils whose fields are orthogonal respectively to create the line scan and the frame scan. The deflector has a magnetic core to strengthen the magnetic field in the deflection region. In certain methods of constructing deflectors, one of the two windings is toroidal in shape and is constituted by a stack of turns mounted on the magnetic core. In a particular embodiment of the prior art, the toroidal winding is produced in two halves on two half ferrites which, when assembled together, constitute the wound magnetic core. According to such methods, the magnetic core consists of an initially fractured ferrite - according to a relatively geometrical break plane. Then, each half ferrite is wound and the two half ferrites from the same ferrite are connected to each other and fixed by means of spring metal parts. It clearly appears that the magnetic axis of the core must be known with the greatest possible precision in order to achieve a suitable winding.

Dans l'art antérieur, divers procédés de bobinage sont connus notamment du Brevet Français n° 2 351 903. Selon cet état de l'art, chaque demi ferrite est saisi par le bord fracturé puis bobiné selon un procédé non concerné par l'invention. Les surfaces en contact avec l'organe de saisie sont usinées avec précision afin de permettre un repérage précis de l'axe magnétique. Une telle façon de procéder est désavantageuse à plus d'un titre. Tout d'abord elle requiert des opérations longues et coûteuses pour permettre l'usinage de grandes surfaces. Puis l'usinage le long du bord cassé de la demi ferrite ne permet plus de refermer convenablement le circuit magnétique quand l'on rassemble les deux demis ferrites.In the prior art, various winding methods are known in particular from French Patent No. 2,351,903. According to this state of the art, each half ferrite is gripped by the fractured edge and then wound according to a process not concerned by the invention . The surfaces in contact with the gripping member are machined with precision to allow precise identification of the magnetic axis. Such a procedure is disadvantageous for more than one reason. First of all, it requires long and costly operations to allow machining of large areas. Then the machining along the broken edge of the half ferrite no longer allows the magnetic circuit to be closed properly when the two half ferrites are brought together.

Selon une autre réalisation de l'art antérieur décrite notamment dans la Demande de Brevet Européen 0 059 003, le noyau magnétique comporte de part et d'autre du plan de casse des rainures précisément usinées qui permettent une saisie repérée du ferrite de façon à réaliser des bobinages précis. Les rainures étant pratiquées le long de tout le ferrite, ces opérations sont relativement complexes et fragilisent notablement le ferrite. D'autre part l'enlèvement de matière est lui aussi relativement considérable ce qui a pour effet de modifier la géométrie des lignes de champ.According to another embodiment of the prior art described in particular in European Patent Application 0 059 003, the magnetic core comprises on either side of the breakage plane precisely machined grooves which allow a marked capture of the ferrite so as to produce precise windings. The grooves being made along the entire ferrite, these operations are relatively complex and significantly weaken the ferrite. On the other hand the removal of material is also relatively considerable which has the effect of modifying the geometry of the field lines.

On notera que la complexité du problème à résoudre provient de la précision recnerchée qui est de l'ordre du dixième de millimètre et de la relative imprécision du ferrite obtenu par frittage de poudre. La cuisson qui donne au ferrite ses propriétés magnétiques définitives provoque un retrait de 20 à 30 % des dimensions initiales. Il existe donc un grand nombre de défauts géométriques une fois le ferrite fabriqué. De plus le plan de casse doit être un plan de symétrie et les surfaces cassées ne sont pas et ne doivent pas être géométriquement planes de façon à permettre leur réassemblage précis. Un autre type de solution selon l'art antérieur consiste à retrouver l'axe magnétique du ferrite au moyen d'un montage particulier. Le ferrite est monté sur une succession de troncs de cône tangeant intérieurement à sa surface et on transfère ce centrage sur des pièces plastiques positionnées sur le montage et collées à ce stade de part et d'autre du ferrite. Les pièces plastiques servent ensuite de référence pour les opérations de bobinage et de réglage du déviateur. Elles servent aussi de moyens de préhension à des pinces pour toute manipulation des ferrites. Ce type de solution est relativement coûteux et de plus donne des résultats qui dépendent du soin apporté aux opérations de collage des pièces plastiques.It will be noted that the complexity of the problem to be solved comes from the accuracy sought which is of the order of a tenth of a millimeter and from the relative imprecision of the ferrite obtained by powder sintering. The baking which gives ferrite its final magnetic properties causes a shrinkage of 20 to 30% of the initial dimensions. There are therefore a large number of geometric defects once the ferrite is manufactured. In addition, the break plane must be a plane of symmetry and the broken surfaces are not and must not be geometrically plane so as to allow their precise reassembly. Another type of solution according to the prior art consists in finding the magnetic axis of the ferrite by means of a particular assembly. The ferrite is mounted on a succession of truncated cones tangent internally to its surface and this centering is transferred to plastic parts positioned on the assembly and glued at this stage on either side of the ferrite. The plastic parts are then used as a reference for the winding operations and for setting the deflector. They also serve as gripping means for pliers for any manipulation of the ferrites. This type of solution is relatively expensive and moreover gives results which depend on the care taken in the operations of bonding plastic parts.

Selon un autre type de solution, le ferrite porte sur ses bords annulaires des encoches de petites dimensions qui serviront de repères de position pour disposer les pièces plastiques. La précision de l'opération de positionnement dépend du diamètre extérieur d'appui du ferrite, les montages connus se composant d'une butée fixe sur laquelle prend appui l'encoche, d'une portée demi circulaire sur laquelle vient porter un diamètre extérieur du ferrite et d'une butée mobile venant appuyer sur l'encoche opposée du ferrite. De telles solutions imposent un tri préalable des ferrites en classes homogènes de précision et de plus ne permettent pas l'automatisation des chai- nes de fabrication de déviateurs. L'objet de l'invention est de permettre de restituer l'axe du ferrite en fonction de ses qualités géométriques, en évitant le tri en différentes classes de ferrites et en permettant une automatisation du procédé de fabrication.According to another type of solution, the ferrite carries on its annular edges notches of small dimensions which will serve as position markers for arranging the plastic parts. The precision of the positioning operation depends on the external diameter of the ferrite support, known assemblies consisting of a fixed stop on which the notch is supported, a semi-circular bearing on which comes an external diameter of the ferrite and a movable stop coming to press on the opposite notch of the ferrite. Such solutions require a preliminary sorting of the ferrites into homogeneous classes of precision and moreover do not allow the automation of the deflector production lines. The object of the invention is to make it possible to restore the axis of the ferrite according to its geometric qualities, by avoiding sorting into different classes of ferrites and by allowing the manufacturing process to be automated.

La présente invention concerne un procédé de positionnement et de saisie d'un demi-noyau obtenu par rupture suivant un plan axial d'un noyau magnétique en ferrite à symétrie de révolution, notamment pour un déviateur de tube à rayons cathodiques, ce demi-noyau comportant, sur ses bords créés par la rupture, des moyens de repérage de la position de son axe de révolution, caractérisé en ce que le demi-noyau est d'abord appliqué sur une platine de positionnement en appui sur des éléments de centrage coopérant avec lesdits moyens de repérage, qui sont des encoches réalisées lors du moulage du noyau, puis des moyens mobiles de centrage, qui se déplacent perpendiculairement par rapport au plan principal de la platine de positionnement, sont appliqués sur le demi-noyau pour faire coïncider son axe de révolution avec un axe de centrage de la platine de positionnement, et le demi-noyau ainsi positionné est saisi par un organe de préhension qui transfère l'information de l'axe de centrage sur un élément géométrique de l'organe de préhension.The present invention relates to a method of positioning and gripping a half-core obtained by rupture along an axial plane of a ferrite magnetic core with symmetry of revolution, in particular for a deflector of a cathode ray tube, this half-core comprising, on its edges created by the rupture, means for locating the position of its axis of revolution, characterized in that the half-core is first applied to a positioning plate bearing on centering elements cooperating with said locating means, which are notches made during the molding of the core, then mobile centering means, which move perpendicular to the main plane of the positioning plate, are applied to the half-core to make its axis of revolution coincide with a centering axis of the positioning plate, and the half -core thus positioned is gripped by a gripping member which transfers the information from the centering axis to a geometric element of the gripping member.

L'invention concerne aussi un centreur spécialement conçu pour la mise en oeuvre du procédé selon l'invention. Un tel centreur comporte :

  • une platine composée d'un plateau qui contient la direction de l'axe magnétique du demi ferrite et de moyens de centrage ;
  • une pince amovible sur la platine qui porte des moyens de saisie du demi ferrite une fois celui-ci positionné sur le plateau du centreur.
The invention also relates to a centralizer specially designed for implementing the method according to the invention. Such a centralizer includes:
  • a plate composed of a plate which contains the direction of the magnetic axis of the half ferrite and of centering means;
  • a removable clamp on the plate which carries means for gripping the half ferrite once it has been positioned on the centralizing plate.

D'autres avantages de la présente invention seront mieux compris à l'aide de la description et des figures qui sont :

  • la figure 1 : un demi ferrite utilisé dans le procédé selon l'invention,
  • les figures 2 et 3 : des ferrites selon l'art antérieur,
  • la figure 4: un schéma permettant d'expliquer le procédé selon l'invention,
  • la figure 5 : un schéma de centreur selon l'invention,
  • la figure 6: un schéma d'une pince selon un mode particulier de réalisation de l'invention.
Other advantages of the present invention will be better understood with the aid of the description and the figures which are:
  • FIG. 1: a half ferrite used in the method according to the invention,
  • FIGS. 2 and 3: ferrites according to the prior art,
  • FIG. 4: a diagram making it possible to explain the method according to the invention,
  • FIG. 5: a centralizing diagram according to the invention,
  • Figure 6: a diagram of a clamp according to a particular embodiment of the invention.

A la figure 1, on a représenté un demi ferrite. La forme générale du ferrite est un tronc de cône. Le ferrite se compose donc de deux sommets, l'un supérieur constitué par une petite couronne circulaire, l'autre inférieure constituée par une grande couronne circulaire. Le ferrite est obtenu par moulage et frittage d'un matériau magnétique convenable. Selon un procédé connu de fabrication de déviateur, une bobine à spires toriques est montée sur le ferrite. Une première méthode consiste, par une mécanique spéciale, à enrouler du fil avec une navette qui circule autour des flancs du ferrite à l'intérieur et à l'extérieur de celui-ci. L'invention se rapporte à un autre type de fabrication selon une seconde méthode. Le ferrite est préalablement cassé en deux moitiés sensiblement égales. Chaque demi ferrite est bobiné sur une machine spéciale puis les deux demi ferrites bobinés sont réappairés et assemblés de façon à constituer un bobinage torique sur ferrite. Or le bobinage doit être réalisé selon un axe magnétique connu qui dépend notamment de la géométrie du ferrite. Ainsi, le demi ferrite doit être placé sur la bobineuse de manière à ce que la position de l'axe magnétique soit convenable. Il faut donc que chaque demi ferrite garde la mémoire de la position de l'axe magnétique du ferrite. Le ferrite étant un corps de révolution, on peut choisir l'axe central du ferrite comme axe magnétique du ferrite bobiné dans tout plan passant par des diamètres des bords supérieur et inférieur du ferrite en tronc de cône. Pour partager le ferrite en deux on choisit un tel plan dit plan de casse en réalisant des amorces de rupture à l'intersection des bords du ferrite et du futur plan de casse. Le repérage géométrique de ces amorces de rupture permet de mémoriser l'information de position de l'axe central du ferrite. Dans la pratique, les amorces de rupture sont réalisées par moulage d'encoche à la fabrication du ferrite.In Figure 1, a half ferrite is shown. The general shape of the ferrite is a truncated cone. The ferrite therefore consists of two vertices, the upper one consisting of a small circular crown, the other lower consisting of a large circular crown. Ferrite is obtained by molding and sintering a suitable magnetic material. According to a known method of manufacturing a deflector, a coil with toric turns is mounted on the ferrite. A first method consists, by special mechanics, of winding wire with a shuttle which circulates around the flanks of the ferrite inside and outside of it. The invention relates to another type of manufacturing according to a second method. The ferrite is previously broken into two substantially equal halves. Each half ferrite is wound on a special machine then the two half ferrites wound are re-paired and assembled so as to constitute a toroidal winding on ferrite. However, the winding must be carried out along a known magnetic axis which depends in particular on the geometry of the ferrite. Thus, the half ferrite must be placed on the winder so that the position of the magnetic axis is suitable. It is therefore necessary that each half ferrite keeps the memory of the position of the magnetic axis of the ferrite. Since the ferrite is a body of revolution, the central axis of the ferrite can be chosen as the magnetic axis of the ferrite wound in any plane passing through diameters of the upper and lower edges of the truncated cone ferrite. To divide the ferrite in two, one chooses such a plane known as the break plane by making incipient fractures at the intersection of the edges of the ferrite and the future break plane. The geometrical location of these fracture primers makes it possible to memorize the position information of the central axis of the ferrite. In practice, the incipient fractures are produced by notch molding in the manufacture of ferrite.

A la figure 1, on a représenté un demi ferrite 1, dont l'axe central 3 est dans le plan de casse 2. On remarque que la position de cet axe 3 est à mi distance des encoches 4 et 6 du demi cercle constituant le bord supérieur et des encoches 5 et 7 du bord inférieur.In FIG. 1, a half ferrite 1 is shown, the central axis 3 of which is in the break plane 2. It is noted that the position of this axis 3 is midway between the notches 4 and 6 of the semicircle constituting the upper edge and notches 5 and 7 of the lower edge.

Le demi ferrite porte ainsi l'information de position de l'axe central 3. Les bords fracturés qui sont représentés lisses dans le plan de casse 3, sont en fait des surfaces assez irrégulières puisqu'elles proviennent d'une fracture d'un matériau fritté. Cette caractéristique exigera qu'on réappaire les demis ferrites venant d'un même ferrite cassé afin que les irrégularités des bords fracturés correspondent. L'invention permet aussi de s'affranchir largement des défauts d'ovalisation de ces sommets dont sont tributaires les procédés antérieurs d'alignement ou de saisie.The half ferrite thus carries the position information of the central axis 3. The fractured edges which are shown smooth in the breakage plane 3, are in fact fairly irregular surfaces since they come from a fracture of a material sintered. This characteristic will require that the half ferrites coming from the same broken ferrite be re-paired so that the irregularities of the fractured edges correspond. The invention also makes it possible to largely overcome the ovalization defects of these vertices on which the prior alignment or gripping methods are dependent.

A la figure 2, on a représenté un noyau magnétique ou ferrite 13 constitué de deux demis ferrites avec des encoches 8 et 9. L'axe magnétique 3 appartient au plan de casse séparant les deux demis ferrites. Chaque demi ferrite comporte une encoche 10 ou 11 pratiquée dans le corps conique du ferrite. L'assemblage des deux demis ferrites est fixé par une pièce 12 en acier ressort amovible, installée dans les encoches 10, 11 sur chaque côté fracturé du ferrite reconstitué.In Figure 2, there is shown a magnetic core or ferrite 13 consisting of two half ferrites with notches 8 and 9. The magnetic axis 3 belongs to the break plane separating the two half ferrites. Each half ferrite has a notch 10 or 11 formed in the conical body of the ferrite. The assembly of the two half ferrites is fixed by a piece 12 of removable spring steel, installed in the notches 10, 11 on each fractured side of the reconstituted ferrite.

D'autres éléments de repérage de la position du demi ferrite sont prévus en remplacement des encoches. Ces éléments comprennent des ergots disposés de part et d'autre des bords cassés du demi ferrite vers l'intérieur ou l'extérieur de la concavité du demi ferrite selon les cas. Ces ergots ont des dimensions déterminées selon l'organe de saisie utilisé dans le procédé selon l'invention, afin de permettre une saisie repérée du demi ferrite.Other elements for locating the position of the half ferrite are provided to replace the notches. These elements include lugs arranged on either side of the broken edges of the half ferrite towards the inside or outside of the concavity of the half ferrite as the case may be. These pins have dimensions determined according to the gripping member used in the method according to the invention, in order to allow a marked gripping of the half ferrite.

A la figure 3, on a représenté un ferrite entier monté avec oreilles. Cette figure illustre une réalisation de l'art antérieur. Chaque ferrite est muni d'oreilles de référence géométrique et de saisie qui sont collées sur ses flancs. Le plan de casse 20 de la ferrite 14 est parallèle aux plans dans lesquels se situent les deux oreilles 16a et 16b. Une oreille 16a ou b comporte trois trous 17-19 qui permettent de connaître avec précision la position de l'axe 15 central et une future fixation du demi ferrite à une bobineuse. L'oreille est réalisée en matériau plastique qui est collé sur le ferrite.In Figure 3, there is shown a whole ferrite mounted with ears. This figure illustrates an embodiment of the prior art. Each ferrite is fitted with geometric reference and gripping ears which are glued to its sides. The break plane 20 of the ferrite 14 is parallel to the planes in which the two ears 16a and 16b are located. An ear 16a or b has three holes 17-19 which make it possible to know with precision the position of the central axis 15 and a future fixing of the half ferrite to a winder. The ear is made of plastic material which is glued to the ferrite.

A la figure 4, on a représenté un centreur selon l'invention qui permettra de décrire le procédé selon l'invention. Sous forme schématique, le centreur comporte une platine 21, 22 constituée par la platine 22 proprement dite et une embase 21. La platine 22 comporte une face verticale plane sur laquelle sont disposés des éléments de centrage 29, 30, 33-36. Ces éléments de centrage sont tout d'abord des onglets 29 et 30 destinés à venir appuyer dans les encoches hautes du demi ferrite 23 placé dans le centreur. Il comporte aussi des onglets 33, 34 qui viennent dans les encoches basses du demi ferrite 23. Ils comprennent enfin des aiguilles 35 et 36 qui assurent le positionnement le long de l'axe 40 du demi ferrite 23. On remarque à l'arrière du montage un Vé inférieur 27, 28 et un double demi Vé 24, 25 supérieur. Dans le procédé selon l'invention, la barre 26 qui actionne le Vé 27, 28 réalise un centrage selon un premier axe de référence de la demi ferrite 23 sur l'axe 40 désiré. Le Vé 26, 28 est mobile le long de la direction 37. Les extrémités 27 et 28 de ce Vé inférieur viennent prendre appui sur les bords de la couronne circulaire inférieure du demi ferrite 23. Puis dans un second temps, les deux demi V supérieurs 24 et 25 sont translatés le long des directions 38 et 39 de façon à venir appliquer leurs extrémités 31 et 32 sur la couronne supérieure du demi ferrite 23. Ce dernier mouvement permet d'appliquer correctement le demi ferrite sur la platine 22, l'appui sur les aiguilles 35, 36 se faisant par gravité. Le demi ferrite 23 repose sur les aiguilles 35 et 36 de manière à régler convenablement sa hauteur par rapport à l'embase 21. Dans cette position le ferrite est centré sur l'axe 40 ce qui signifie que son axe magnétique est confondu avec l'axe 40 dessiné sur la platine 22.In Figure 4, there is shown a centralizer according to the invention which will describe the method according to the invention. In schematic form, the centering device comprises a plate 21, 22 constituted by the plate 22 proper and a base 21. The plate 22 has a vertical face plane on which are arranged centering elements 29, 30, 33-36. These centering elements are first of all tabs 29 and 30 intended to come to bear in the high notches of the half ferrite 23 placed in the centralizer. It also has tabs 33, 34 which come in the lower notches of the half ferrite 23. Finally, they include needles 35 and 36 which ensure the positioning along the axis 40 of the half ferrite 23. We note at the rear of the mounting a lower V 27, 28 and a double half V 24, 25 upper. In the method according to the invention, the bar 26 which actuates the V 27, 28 realizes a centering along a first reference axis of the half ferrite 23 on the desired axis 40. The V 26, 28 is movable along the direction 37. The ends 27 and 28 of this lower V come to bear on the edges of the lower circular crown of the half ferrite 23. Then in a second step, the two upper half V 24 and 25 are translated along directions 38 and 39 so as to apply their ends 31 and 32 to the upper crown of the half ferrite 23. This last movement makes it possible to correctly apply the half ferrite to the plate 22, the support on needles 35, 36 by gravity. The half ferrite 23 rests on the needles 35 and 36 so as to properly adjust its height relative to the base 21. In this position the ferrite is centered on the axis 40 which means that its magnetic axis is coincident with the axis 40 drawn on plate 22.

Dans cette représentation schématique, il faut amener un organe de préhension ou pince, qui permette de saisir le demi ferrite 23 dans une position qui transfère l'information de l'axe 40 sur un élément géométrique de la pince de saisie disposée à 90° du plan de casse par exemple entre les Vés du centreur. L'élément géométrique qui sert à mémoriser l'information de position de l'axe 40 magnétique du demi ferrite est dans un exemple de réalisation préféré constitué par deux bords parallèles d'un plateau constituant le corps de la pince. Dans un autre exemple de réalisation, l'élément de mémorisation géométrique est constitué par trois perçages du corps de la pince dont les positions relatives aux éléments de centrage de la platine du centreur sont connus. Cette opération de saisie est le deuxième temps principal du procédé selon l'invention. La pince est amovible. Dans un premier mode de réalisation selon l'invention, la pince saisit le demi ferrite 23 selon l'axe A. Cette pince vient entre les deux demi Vés supérieurs 24 et 25 saisir le ferrite selon un plan perpendiculaire au plan vertical de référence de la platine 22. Des organes mécaniques de guidage non représentés à la figure 4 sont prévus pour que ce plan de saisie perpendiculaire au plan 22 contienne aussi l'axe 40 de centrage. Il faut alors que la pince de saisie non représentée comporte un élément mécanique de référence qui contienne à la fois l'axe A et l'axe 40. Ceci peut être réalisé par un plateau dont l'une des faces au moins contient le plan engendré par les axes A et 40.In this schematic representation, it is necessary to bring a gripping member or clamp, which makes it possible to grasp the half ferrite 23 in a position which transfers the information from the axis 40 onto a geometrical element of the gripping clamp arranged at 90 ° breakage plan for example between the Ves of the centralizer. The geometrical element which serves to memorize the position information of the magnetic axis 40 of the half ferrite is in a preferred embodiment constituted by two parallel edges of a plate constituting the body of the clamp. In another exemplary embodiment, the geometric storage element consists of three holes in the body of the clamp whose positions relating to the centering elements of the centralizing plate are known. This entry operation is the second main step of the method according to the invention. The clamp is removable. In a first embodiment according to the invention, the clamp grasps the half ferrite 23 along the axis A. This clamp comes between the two upper half Vs 24 and 25 grip the ferrite in a plane perpendicular to the vertical reference plane of the plate 22. Mechanical guide members not shown in FIG. 4 are provided so that this gripping plane perpendicular to the plane 22 also contains the centering axis 40. It is then necessary for the gripper, not shown, to include a mechanical reference element which contains both the axis A and the axis 40. This can be achieved by a plate of which at least one of the faces contains the generated plane. by axes A and 40.

A la figure 5, on a représenté un second mode de réalisation particulière selon l'invention. Un tel ensemble centreur et pince est particulièrement adapté à l'invention. Le centreur comporte principalement une embase 50 et une platine 73. L'embase 50 porte un chariot 51 mobile en translation sur deux rails 52 par l'intermédiaire d'une vis sans fin 53 mobile sous l'action d'un moteur 54.In Figure 5, there is shown a second particular embodiment according to the invention. Such a centering and clamp assembly is particularly suitable for the invention. The centralizer mainly comprises a base 50 and a plate 73. The base 50 carries a carriage 51 movable in translation on two rails 52 by means of an endless screw 53 movable under the action of a motor 54.

Le chariot porte des éléments moteurs des demis Vés représentés sur la figure 4 pris décrite. On reconnaît les demis Vés supérieurs 60 et 59 qui sont rappelés sur l'axe A par des ressorts 61 et 62. On aperçoit aussi la partie 69 du Vé inférieur de centrage. Dans ce mode de réalisation le demi ferrite 63 est saisi par son bord gauche par une pince 65. Dans ce mode particulier de réalisation, la platine 73 porte des éléments de centrage du côté du bord non saisi du ferrite. Un onglet 64, seul visible à la figure, aide au centrage en pénétrant dans l'encoche correspondante du bord du demi ferrite. Ces éléments de centrage sont complétés par un onglet inférieur et une aiguille qui complète ainsi le triplet déjà décrit à la figure 4. Sur la face opposée du demi ferrite est disposée une pince 65 constituée principalement par un plateau 65a disposé entre deux glissières 70, 71. La pince comporte une partie 65b de positionnement et saisie.The carriage carries the driving elements of the half Vs shown in Figure 4 taken described. We recognize the upper half Vs 60 and 59 which are recalled on the axis A by springs 61 and 62. We also see part 69 of the lower centering Vee. In this embodiment, the half ferrite 63 is gripped by its left edge by a clamp 65. In this particular embodiment, the plate 73 carries centering elements on the side of the edge that is not gripped by the ferrite. A tab 64, only visible in the figure, helps with centering by entering the corresponding notch on the edge of the half ferrite. These centering elements are completed by a lower tab and a needle which thus completes the triplet already described in FIG. 4. On the opposite face of the half ferrite is arranged a clamp 65 consisting mainly of a plate 65a disposed between two slides 70, 71 The clamp has a positioning and gripping part 65b.

A la figure 5, la pince 65 a été représentée de façon schématique. Un organe 72 de verrouillage de la pince permet de maintenir la pince en position sur la platine. Dans le procédé selon l'invention, on commence d'abord par disposer la pince par son plateau 65a dans les glissières 70, 71 qui servent de moyens de support de la pince sur son centreur. Le chariot 51 est en position reculée. On introduit alors manuellement ou par un système de distribution automatique non représenté, le demi ferrite 63 dans la région des axes A et 40. Puis le chariot 51 est avancé par la vis 53 et le moteur 54 le long de l'axe A jusqu'à une butée fixe. Dans un deuxième temps un moteur 55 actionne les vis 59, 60 et 69 au moyen d'un étrier basculant 58, 57. L'étrier basculant 57, 58 est monté pivotant autour d'un axe horizontal perpendiculaire à la direction A d'avancée de façon à répartir l'action de poussée entre les Vés supérieur et inférieur. Il porte une fourchette 58 qui bascule selon un axe proche de la verticale et qui répartit la poussée entre les deux demis Vés supérieurs. Arrivés en fin de course les moteurs 54 et 55 équipés de limiteurs de couple comme le limiteur 56 maintiennent une pression sur le demi ferrite 63, la mise en place du ferrite sur la platine est terminée à ce moment. La pince est mise en action. Elle comporte trois éléments de positionnement qui, dans un exemple préféré de réalisation, sont trois pions de centrage 83, 84 visibles pour deux d'entre eux à la figure 6. Ces pions sont mobiles le long d'une direction perpendiculaire à l'axe central 40 d'alignement et proche du plan de casse. La pince porte aussi un moyen de saisie 68 qui permet de maintenir quand il est activé par un moyen 67 le demi ferrite sur la pince. Cette activation est effectuée après que le demi ferrite ait été positionné sur l'ensemble pince-platine. Le moyen 67 d'activation du moyen de saisie 68 est manuel. Il est ou bien accessible à un opérateur par le moyen d'un tournevis si le moyen de saisie est mécanique ou d'un interrupteur si le moyen de saisie est électrique comme un électro aimant ou bien manoeuvrable par un automatisme extérieur non représenté à la figure 5.In Figure 5, the clamp 65 has been shown schematically. A member 72 for locking the clamp keeps the clamp in position on the plate. In the method according to the invention, we first begin by placing the clamp by its plate 65a in the slides 70, 71 which serve as means for supporting the clamp on its centering device. The carriage 51 is in the retracted position. Then introduced manually or by an automatic distribution system not shown, the half ferrite 63 in the region of the axes A and 40. Then the carriage 51 is advanced by the screw 53 and the motor 54 along the axis A until to a fixed stop. Secondly, a motor 55 actuates the screws 59, 60 and 69 by means of a tilting stirrup 58, 57. The tilting stirrup 57, 58 is pivotally mounted around a horizontal axis perpendicular to the direction A of advancement so as to distribute the thrust action between the upper and lower Vs. It carries a fork 58 which switches along an axis close to the vertical and which distributes the thrust between the two upper V-halves. At the end of the stroke, the motors 54 and 55 fitted with torque limiters like the limiter 56 maintain pressure on the half ferrite 63, the positioning of the ferrite on the plate is finished at this time. The clamp is put into action. It comprises three positioning elements which, in a preferred embodiment, are three centering pins 83, 84 visible for two of them in FIG. 6. These pins are movable along a direction perpendicular to the axis central alignment 40 and close to the case plan. The clamp also carries a gripping means 68 which makes it possible to maintain, when it is activated by means 67, the half ferrite on the clamp. This activation is carried out after the half ferrite has been positioned on the clamp-plate assembly. The means 67 for activating the input means 68 is manual. It is either accessible to an operator by means of a screwdriver if the input means is mechanical or of a switch if the input means is electric like an electromagnet or can be operated by an external automation not shown in the figure 5.

Les éléments de centrage sont activés par un moyen mécanique de commande 66 dont un exemple de réalisation est décrit plus loin. Ce moyen 66 est lui aussi manoeuvrable par un opérateur ou un automatisme extérieur ou centreur de l'invention. Le centrage et la fixation étant réalisés, le chariot 51 est reculé. Le dispositif de verrouillage 72 est désactivé et un manipulateur manuel ou automatique peut retirer la pince 65 des rails 70, 71.The centering elements are activated by mechanical control means 66, an exemplary embodiment of which is described below. This means 66 is also maneuverable by an operator or an external automation or centering device of the invention. The centering and the fixing being carried out, the carriage 51 is moved back. The locking device 72 is deactivated and a manual or automatic manipulator can withdraw the clamp 65 from the rails 70, 71.

A la figure 6, on a représenté un mode particulier de réalisation d'une pince adaptée à l'invention. Une telle pince comporte un plateau 80 sur lequel est monté un support 81 des vis 86 et 87 d'activation des éléments de saisie et de centrage. Le plateau 80 sert, une fois le demi ferrite centré et saisi selon le procédé de l'invention, à transporter n'importe où l'information de position de l'axe central du demi ferrite saisi centré. Sur le plateau vient se fixer une sangle 82 réalisée par un ruban métallique fixé d'une part par une vis 90 dans la partie haute du plateau et à la partie basse par une vis 89 sur un chariot 88 mobile sur la vis 87. Quand la vis 87 est manoeuvrée le chariot 88 avance ou recule selon le sens de rotation de la vis. On comprend qu'ainsi une tension peut être appliquée sur la sangle 82.In Figure 6, there is shown a particular embodiment of a clamp adapted to the invention. Such a clamp comprises a plate 80 on which is mounted a support 81 of the screws 86 and 87 for activating the gripping and centering elements. The plate 80 is used, once the half ferrite centered and gripped according to the method of the invention, to transport anywhere the position information of the central axis of the gripped half ferrite centered. On the tray is fixed a strap 82 made by a metal tape fixed on the one hand by a screw 90 in the upper part of the tray and at the lower part by a screw 89 on a carriage 88 movable on the screw 87. When the screw 87 is operated the carriage 88 moves forward or backward depending on the direction of rotation of the screw. It is understood that a tension can therefore be applied to the strap 82.

La pince comporte aussi des pions 83 et 84 mobiles en translation le long d'un axe horizontal selon la figure c'est-à-dire un axe parallèle à l'axe des vis 87 et 86. Ces pions sont destinés à venir s'appuyer sur la face externe du demi ferrite installé sur le plateau 80 de manière à ce que le serrage de la sangle 82 permette une application ferme de la face externe du demi ferrite sur les pions 83, 84 de centrage.The clamp also includes pins 83 and 84 movable in translation along a horizontal axis according to the figure, that is to say an axis parallel to the axis of the screws 87 and 86. These pins are intended to come s' press on the external face of the half ferrite installed on the plate 80 so that the tightening of the strap 82 allows firm application of the external face of the half ferrite on the pins 83, 84 for centering.

Ainsi qu'il a été vu précédemment, le serrage de la sangle 82 n'intervient qu'après que la vis 86 ait permis la manoeuvre des pions 83 et 84 qui viennent compléter l'effet des éléments de centrage disposés sur la platine de la figure 5. En effet la vis 86 manœuvrée permet, par l'étrier 85, de venir répartir un effort de centrage par l'intermédiaire de tringles 91 et 92 sur les pions 83 et 84 de la manière décrite plus haut pour l'étrier 57, 58 basculant de la figure 5. Un poussoir 93 permet de venir bloquer le réglage indépendamment du retrait du couple de rotation appliqué à la vis 86 par le tournevis automatique. Le tournevis automatique qui manoeuvre la vis 87 permet alors le serrage de la sangle 82 ainsi qu'il vient d'être décrit. La pince portant le demi ferrite peut être utilisé à différentes fins notamment de bobinage du demi ferrite. La position de l'axe magnétique du demi ferrite est connue avec précision en fonction notamment du plan dans lequel se situe le plateau 80.As has been seen previously, the tightening of the strap 82 does not take place until after the screw 86 has allowed the operation of the pins 83 and 84 which complete the effect of the centering elements arranged on the plate of the Figure 5. Indeed the screw 86 operated allows, by the caliper 85, to distribute a centering force through rods 91 and 92 on the pins 83 and 84 as described above for the caliper 57 , 58 tilting in FIG. 5. A push-button 93 allows the adjustment to be blocked independently of the withdrawal of the torque applied to the screw 86 by the automatic screwdriver. The automatic screwdriver which operates the screw 87 then allows the tightening of the strap 82 as just described. The clamp carrying the half ferrite can be used for different purposes, in particular for winding the half ferrite. The position of the magnetic axis of the half ferrite is known with precision as a function in particular of the plane in which the plate 80 is located.

D'autres modes de réalisation de pinces sont utilisés. En particulier, une pince de ce type ne convient pas facilement pour saisir la demi ferrite ailleurs que sur un bord du plan de casse. En particulier, pour permettre de saisir le demi ferrite par sa périphérie selon le procédé de l'invention, la pince comporte des moyens de magnétisation du ferrite de manière à permettre une fixation commandable amovible du demi ferrite sur la pince. La pince comporte un électro-aimant qui exerce une force d'attache du demi ferrite sur sa pince. Le centreur comporte des organes de centrage pour les deux bords du demi ferrite.Other embodiments of pliers are used. In particular, a clamp of this type is not easily suitable for gripping the half ferrite elsewhere than on an edge of the break plane. In particular, to enable the half ferrite to be grasped by its periphery according to the method of the invention, the clamp comprises means for magnetizing the ferrite so as to allow a removable, controllable attachment of the half ferrite to the clamp. The clamp has an electromagnet which exerts a force for attaching the half ferrite to its clamp. The centering device comprises centering members for the two edges of the half ferrite.

D'autres modes de réalisation de la relation pince-centreur que les glissières 70, 71 sont prévus. En particulier la pince peut être portée par le centreur par l'intermédiaire d'un arbre introduit par un alésage de la platine à plan vertical contenant l'axe de centrage 40. Cet arbre solidaire du plateau 80 perpendiculairement à son plan est pris dans un moyen de fixation amovible de manière à rendre la pince temporairement solidaire du centreur proprement dit pendant les opérations de centrage et de saisie. Le dispositif de verrouillage 72 de la pince sur la platine agit alors sur ce moyen de fixation et est commandé comme il a été vu ci-dessus en fonction du procédé selon l'invention.Other embodiments of the clamp-centering relationship than the slides 70, 71 are provided. In particular, the clamp can be carried by the centering device by means of a shaft introduced by a bore in the plate with a vertical plane containing the centering axis 40. This shaft secured to the plate 80 perpendicular to its plane is taken in a removable fixing means so as to make the clamp temporarily secured to the centralizer proper during the centering and gripping operations. The locking device 72 of the clamp on the plate then acts on this fixing means and is controlled as it was seen above according to the method according to the invention.

Claims (15)

1. A method of positioning and grasping a half-core obtained by the rupture in an axial plane of a magnetic core of ferrite with radial symmetry, more especially for a deflector of a CRT, said half-core comprising, on edges created by the rupture, indexing means (4, 5, 6 and 7) for the position of its axis of revolution, characterized in that the said half-core is firstly applied to a positioning plate (22 or 73) resting on centering elements (29, 30, 33 to 36 or 64) cooperating with the said indexing means, which are in the form of notches produced at the time of molding the core, then mobile centering means (24, 25, and 26 or 59 and 60), which are displaced perpendicularly in relation to the principal plane of the positioning plate, are applied to the half-core in order to produce coincidence between its axis (3) of revolution and the centering axis (40) of the positioning plate, and the half-core positioned in this manner is grasped by a gripping means which transfers the information on the centering axis to a geometrical element of the gripping means.
2. The method as claimed in claim 1, characterized in that the positioning of the half-ferrite on the centering elements is performed in two steps :
the part of the edges corresponding to the minor apex of the ferrite is firstly applied to its centering elements, and then
the part of the edges corresponding to the major apex of the ferrites is applied to its centering elements.
3. A centering device specially conceived for performing the method as claimed in claim 1, characterized in that it comprises
a plate (22) which comprises a sheet which serves as a reference for the position and carries the centering means (24 to 36) for the half-ferrite, and
a movable tongs (80) of the centering device which carries the grasping means (82) for the half-ferrite as soon as the latter is positioned on the plate of the centering device.
4. The centering device as claimed in claim 3, characterized in that it comprises a base (21) on the plate (22) which carries motor means (24, 25, 27 and 28) in order to apply the half-ferrite on the plate (22).
5. The centering device as claimed in claim 4, characterized in that the said means for applying the half-ferrite (23) comprise two thrusting means, the first (24 and 25) of which is constituted by a V destined to bear on the major crown of the half-ferrite and the second being constituted by a V (27 and 28) adapted to bear on the minor crown of the half-ferrite.
6. The centering device as claimed in claim 5, characterized in that the plate (22) is placed vertically and the half-ferrite is disposed in such a manner that its half-crown with a small diameter is below the half-crown with a large diameter in order to take advantage of the weight of the half-ferrite in the course of the centering operation.
7. The centering device as claimed in claim 3, in which the half-ferrite comprises reference elements for the position of its magnetic axis in the form of notches produced in the corners of the fractured edges, characterized in that the centering elements comprise miters (29 and 30 ; 33 and 34) adapted to fit into the corresponding notches of the half-ferrite.
8. The centering device as claimed in claim 6 or claim 7, characterized in that the centering elements furthermore comprise needles (35 and 36) placed so as to vertically bear underneath the lower crown in order to adjust vertical centering, in relation to the centering elements for the plate (22).
9. The centering device as claimed in claim 3, characterized in that the tongs comprises :
a reference part (80) adapted to store the information concerning the position of the magnetic axis of the centered half-ferrite, and
centering means (83 and 84) and grasping means (82) for the half-ferrite, and in that the centering device comprises means (70 and 71) in order to put the tongs in the centering position and locking means (72) for the tongs to lock it in this position during the operations of centering and grasping the half-ferrite.
10. The centering device as claimed in claim 9, characterized in that the tongs comprises, in order to grasp the half-ferrite by one of its edges, centering elements placed on a sheet (80) serving as a reference part for the half-ferrite, the tongs being carried by the centering device on the support means (70 and 71) during the centering and grasping operations performed on the ferrite and being locked thereon by means (72).
11. The centering means as claimed in claim 10, characterized in that the said support means comprise two slides (70 and 71) in which the tongs (65, figure 5) is fitted laterally on the centering device.
12. The centering device as claimed in claim 10, characterized in that the said support means comprise a bore on the side of the plate of the centering device and a shaft secured to the sheet (65a, figure 5) of the tongs and perpendicular to the reference plane of the said sheet, adapted to be placed in the bore of the centering device during the operations of centering and grasping.
13. The centering device as claimed in claim 10, characterized in that the centering elements disposed on the tongs comprise studs (83 and 84, figure 6) intended to bear on the edge of the half-ferrite grasped by the tongs.
14. The centering device as claimed in claim 9, characterized in that the means for grasping the half-ferrite comprises a loop (82) fixed to one of its ends (90) and adapted to be acted upon by a pulling force on the other end mounted on a carriage (88).
15. The centering device as claimed in claim 9, characterized in that the centering means (83 and 84) and the grasping means (82) are actuated by screw driving means (86 and 87).
EP85400293A 1984-02-21 1985-02-19 Process for positioning and holding ferrite halves for magnetic cores and centering device for carrying out the process Expired EP0156674B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400293T ATE47251T1 (en) 1984-02-21 1985-02-19 PROCEDURE FOR POSITIONING AND FIXING FERRITE HALVES FOR MAGNETIC CORES AND CENTERING DEVICE FOR CARRYING OUT THE PROCEDURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8402570 1984-02-21
FR8402570A FR2559947B1 (en) 1984-02-21 1984-02-21 METHOD FOR POSITIONING AND SEIZING HALF-FERRITES FOR MAGNETIC CORE AND CENTERER IMPLEMENTING THE METHOD

Publications (2)

Publication Number Publication Date
EP0156674A1 EP0156674A1 (en) 1985-10-02
EP0156674B1 true EP0156674B1 (en) 1989-10-11

Family

ID=9301205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400293A Expired EP0156674B1 (en) 1984-02-21 1985-02-19 Process for positioning and holding ferrite halves for magnetic cores and centering device for carrying out the process

Country Status (8)

Country Link
US (1) US4637803A (en)
EP (1) EP0156674B1 (en)
JP (1) JPS60246541A (en)
AT (1) ATE47251T1 (en)
DE (1) DE3573682D1 (en)
DK (1) DK77785A (en)
FR (1) FR2559947B1 (en)
GR (1) GR850424B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1889398A (en) * 1932-03-05 1932-11-29 Western Electric Co Electrical coil and a method of manufacturing it
US3799462A (en) * 1971-08-23 1974-03-26 Universal Mfg Co Toroidal coil-winding machine
GB1579227A (en) * 1976-05-17 1980-11-12 Rca Corp Coil winding machine and method
JPS5713648A (en) * 1980-06-30 1982-01-23 Toshiba Corp Production unit of vertical deflection coil

Also Published As

Publication number Publication date
JPS60246541A (en) 1985-12-06
GR850424B (en) 1985-06-17
DK77785D0 (en) 1985-02-20
US4637803A (en) 1987-01-20
FR2559947A1 (en) 1985-08-23
EP0156674A1 (en) 1985-10-02
ATE47251T1 (en) 1989-10-15
FR2559947B1 (en) 1986-05-16
DE3573682D1 (en) 1989-11-16
DK77785A (en) 1985-08-22
JPH0578131B2 (en) 1993-10-28

Similar Documents

Publication Publication Date Title
EP0669185B1 (en) Magazine for changing tools or workpieces on machine tools
EP1557729B1 (en) Method of fabrication of time markers and apparatus for its implementation
CH646892A5 (en) METHOD OF CUTTING BY ELECTRIC SHOCK.
EP1165282B1 (en) Method for holding a part in position in an assembly station
EP0071542A1 (en) Control of the profile of curved sheets, particularly of the contours of convex windows
CH684642A5 (en) holding clamp a bobbin in a winding machine.
FR2732633A1 (en) Automatic changing of tools in machining station
US4031667A (en) Apparatus for contouring edge of semiconductor wafers
EP0156674B1 (en) Process for positioning and holding ferrite halves for magnetic cores and centering device for carrying out the process
US4479332A (en) Lens blocker and method
EP0509958B1 (en) Method and device for transfering bobbins during unwinding
FR2489721A1 (en) PROCESS FOR COVERING CYLINDRICAL BORES AND BORES OBTAINED BY THIS PROCESS
EP3820265B1 (en) Method and device for cutting a radial electronic component
JP3525784B2 (en) Method and apparatus for assembling CVT belt
DE69425169T2 (en) Magnetic transfer device
US4461197A (en) Methods of and apparatus for dispensing and positioning tape onto a surface
EP2803593B1 (en) Process and device for sleeving an object
FR2534837A1 (en) DIVIDER PLATE FOR MAINTAINING A WORKPIECE DURING ITS MACHINING
FR2635904A1 (en) METHOD AND APPARATUS FOR WINDING A WIRE TO A WORKPIECE, SUCH AS A MAGNETIC READ-WRITE HEAD
JP2004524177A (en) Device for memory lenses with sharp edges
US6769947B1 (en) Method for manufacturing a lamp electrode
EP0657903A1 (en) Method of winding a core having an electronic component and means for guiding wires connecting a coil with the electronic component
JP2661003B2 (en) Bobbin for inductance and its winding method
FR2497781A1 (en) METHOD FOR CHANGING COILS AND CHUCKS OF WINDING MACHINES WITHOUT AXIS
KR20180011437A (en) Scribing apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE DE GB IT NL SE

17P Request for examination filed

Effective date: 19851218

17Q First examination report despatched

Effective date: 19870422

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE GB IT NL SE

REF Corresponds to:

Ref document number: 47251

Country of ref document: AT

Date of ref document: 19891015

Kind code of ref document: T

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 3573682

Country of ref document: DE

Date of ref document: 19891116

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19921221

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19930115

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930129

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930223

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19930226

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930228

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940219

Ref country code: AT

Effective date: 19940219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19940228

BERE Be: lapsed

Owner name: VIDEOCOLOR

Effective date: 19940228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940901

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19941101

EUG Se: european patent has lapsed

Ref document number: 85400293.8

Effective date: 19940910