EP0288335B1 - Cathode inserter for a crt - Google Patents

Cathode inserter for a crt Download PDF

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Publication number
EP0288335B1
EP0288335B1 EP88400605A EP88400605A EP0288335B1 EP 0288335 B1 EP0288335 B1 EP 0288335B1 EP 88400605 A EP88400605 A EP 88400605A EP 88400605 A EP88400605 A EP 88400605A EP 0288335 B1 EP0288335 B1 EP 0288335B1
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EP
European Patent Office
Prior art keywords
cathode
probe
sensor
rod
machine
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 - Lifetime
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EP88400605A
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German (de)
French (fr)
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EP0288335A1 (en
Inventor
Daniel Cote
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Videocolor SA
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Videocolor SA
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Publication date
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Publication of EP0288335A1 publication Critical patent/EP0288335A1/en
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    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/18—Assembling together the component parts of electrode systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/18—Assembling together the component parts of the discharge tube
    • H01J2209/185—Machines therefor, e.g. electron gun assembling devices

Definitions

  • the present invention relates to a cathode implantation machine in a cathode ray tube barrel according to the preamble of claim 1.
  • these machines position the cathode relative to the grid G1 by first inserting a probe of fixed length between the cathode and the grid G1, the cathode being disposed on a fixed support, and the barrel on a mobile support driven by a roller cooperating with the groove in cam profile of a lead screw itself driven by a stepping motor.
  • the drive device with lead screw and roller is imprecise: the groove in the lead screw must be free of any dust or debris, which is difficult to obtain in an industrial environment; even if the stepping motor stops in a precise manner in the desired angular position, the coupling device with the lead screw which it drives presents plays which are difficult to take into account; the forces exerted on the roller both by the barrel carriage and by the lead screw mean that the games of this motion transmission is passed on to the carriage.
  • the cathode eyelet is offset, the probe may deform the eyelet, or the probe must be made of deformable material.
  • the subject of the present invention is a cathode implantation machine in a cathode ray tube barrel which is rapid, precise and faithful, simple, and the probe rod of which does not need to be deformable, without risking a deformation of the cathode eyelet.
  • the machine schematically represented in FIG. 1 comprises a device 1 for movable support for an electron gun 2 for cathode ray tube, a probe 3 with retractable rod, and a device 4 for cathode support 5.
  • the probe 3 and the cathode 5 are arranged in the axis 6 of the barrel.
  • the support device 1 moves the barrel 2 always along its axis 6.
  • the support device 1 comprises a carriage 7 carrying, in a manner known per se, the barrel 2.
  • the carriage 7 moves on a device 8 with a slide under the action of a jack 9.
  • the device 8 comprises two adjustable stops 10 , 11 respectively determining a posterior fixed position and an anterior fixed position.
  • the machine cycle only determines two movements of the carriage 7: from the stop 10 to the stop 11, and back, while the machine cycle of the prior art included four movements determined by a screw mother.
  • the probe 3 of generally cylindrical shape, is mounted on a support device 12 movable perpendicular to the axis 6 between a measurement position, for which the probe axis is coincident with the axis 6, as shown in Figure 1 and a release position.
  • the probe 3 essentially comprises a retractable measuring rod 13 moved by a piston 14 moving in the chamber formed by the cylindrical body 15 of the probe, and at the other end, a distance measuring device 16 facing, in the position of measurement, at the active face of the cathode 5. In the disengaged position, the measuring rod 13 of the probe is retracted. When the probe 3 reaches the measurement position, its rod is extended to come into contact with the first grid G1 of the barrel 2.
  • the feeler device described here is of the control type pneumatic, but it is understood that the invention is not limited to such a probe, and that any probe fulfilling the same function, with retractable rod for measuring the distance between the first barrel grid and the cathode, can suitable, for example a probe with electromagnetic, hydraulic control, etc.
  • the body 15 of the probe 3 is mounted movable in axial translation relative to its support 12 by means of a ball bearing 17. This translation is limited on one side - device side 16 - by a shoulder 18 of the body 15, and of the 'other side by a coil spring 19 disposed around the body 15, and pressing against a cap-ring 20 screwed to the end of the body 15 allowing the rod 13 to pass in leaktight manner and acting as an adjustable stop for the piston 14.
  • the other end of the body 15 is closed, and a coil spring 21, disposed inside the body 15, bears against this closed end and prevents the piston 14 from abutting too abruptly against this end in its withdrawal movement.
  • the body 15 of the feeler is pierced, near the end on which the spring 21 rests, with a radial hole 22 connected by a pipe 23 to a pneumatic control device 24. On this end is screwed, with the possibility of adjustment, a cap 25 pierced with a radial hole 26 communicating with a calibrated axial hole 27 opening facing the cathode 5.
  • the hole 26 is connected to a measuring device 28, not shown in detail, with air gauge and pneumatic pressure source, of a type known per se.
  • This device 24 comprises a pneumatic high pressure source 30 connected by a first reverser 31 either to a pipe 32 or to a pipe 33.
  • the pipe 32 is connected by a regulating device 34 flow rate at the inlet of a Venturi device 35.
  • the device 34 has an adjustable throttle 36 in parallel with a non-return valve 37, the latter passing in the direction 35 to 32.
  • the air suction outlet of the Venturi 35 is connected to a first inlet 38 of a pneumatic drawer 39, the outlet 40 of which is connected to the hole 22 of the probe 3.
  • the pipe 33 is directly connected to the second inlet 41 of the drawer 39.
  • the drawer 39 has two control inputs 42,43.
  • the inlet 42 receives a high pneumatic pressure
  • the inlet 38 is placed in communication with the outlet 40, and when the inlet 43 receives this high pressure, it is the inlet 41 which is brought into communication with the outlet 40.
  • the source 30 is connected on the other hand by a second inverter 44 either to a pipe 45 or to a pipe 46.
  • the pipe 45 is directly connected to the control input 42 of the drawer 39.
  • the pipe 46 is connected, d on the one hand directly to the control input 43, and on the other hand to the input 41 by a device 47 for adjusting the flow rate followed by a non-return valve 48.
  • the device 47 comprises an adjustable throttle 49 in parallel with a non-return valve 50.
  • the valves 48 and 50 pass in the direction 46 to 41, and 41 to 46 respectively.
  • the probe 3 being in the measurement position, at the end of the measurement, the two inverters 31 and 44 are actuated by a device not shown, so as to be in the opposite position to that shown in FIG. 2, that is to say by making the source 30 communicate with the conduits 32 and 45.
  • the drawer 39 actuated by the control 42, is in the position shown in broken lines in Figure 2, that is to say that it communicates 38 with 40.
  • the high pressure arriving through line 32 passes through 34 and creates a vacuum at the outlet of Venturi 35, which is transmitted to hole 22 of the probe.
  • the position of the inverter 44 only is modified, and it then causes the source 30 to communicate with the line 46.
  • the pressure from the source 30 is always sent to the Venturi 35 via the device 34, but since the drawer 39 changes d 'state - because the inverter 44 changes state); the depression created by the Venturi has no effect on the probe.
  • the pressure from the source 30, which is sent to the pipe 46 arrives at the control input 43 and therefore causes the drawer 39 to change state, as has just been specified.
  • the pressure arriving through the pipe 46 passes through the device 47, the valve 48, and therefore reaches the hole 22 at low flow rate via 41.40 and 23.
  • the state of the inverter 31 is reversed, without modifying that of the inverter 44.
  • the high pressure of the source 30 then passes through the line 33, and from there reaches the probe via 40 and 41.
  • the flow d air is then clearly superior to said leaks, which pushes the piston 14 as far as it stops against the cap 20.
  • the rod 13, being in abutment against G1 can no longer advance, which forces the body 15 of the probe to move back towards the cathode by compressing the spring 19.
  • the probe 3 is then in the position shown in line C in FIG. 3.
  • An automatic micrometric screw adjustment device not shown, moves the barrel 2 ⁇ relative to its support carriage 7, so as to obtain the desired reference value - this can for example be a zero setting - with the measuring device 28, that is to say the desired distance G1-cathode.
  • the position of the inverter 44 is changed without modifying that of the inverter 31.
  • the source 30 is then in communication with the control input 42, which actuates the drawer 39 and puts in communication 38 and 40.
  • the pipe 33 is thus closed at 41, and the source 30 communicates neither with 38 nor with 41.
  • the inlet 38 is brought to the surrounding atmospheric pressure via the Venturi 31, so that the compressed air contained in the body 15 of the probe escapes to the outside.
  • the spring 19 relaxes and pushes the probe towards the barrel 2 ⁇ , since the rod 13 is always in abutment against G1.
  • the feeler is then in the position shown in line D in FIG. 3, that is to say practically the same position as it had when sending a low air flow, line B in FIG. 3.
  • the rod 13 of the probe 3 is in a preferred embodiment, in a hardened and rectified metal or alloy which does not deform. If an eyelet is off-center or off-center, the rod does not deform and retracts, because the eyelet then offers sufficient resistance to the pressure exerted by the piston and does not deform.
  • the machine includes an appropriate sensor, not shown, detecting this anomaly, for example by the early withdrawal of the rod, and triggering an alarm and / or actuating a defective barrel ejection device.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Description

La présente invention se rapporte à une machine d'implantation de cathode dans un canon de tube cathodique conforme au préambule de la revendication 1.The present invention relates to a cathode implantation machine in a cathode ray tube barrel according to the preamble of claim 1.

Les machines actuellement utilisées pour l'insertion de cathodes de canons électroniques de tubes cathodiques, utilisent, pour mesurer la distance entre la face active de ces cathodes et la grille G1 (ou, le cas échéant, la grille G2), des appareils complexes, peu rapides, et gardant difficilement la précision nécessaire.The machines currently used for the insertion of cathodes from electronic cannons of cathode ray tubes, use, to measure the distance between the active face of these cathodes and the grid G1 (or, where appropriate, the grid G2), complex devices, not very fast, and hardly retaining the necessary precision.

En effet, ces machines positionnent la cathode par rapport à la grille G1 en intercalant d'abord un palpeur de longueur fixe entre la cathode et la grille G1, la cathode étant disposée sur un support fixe, et le canon sur un support mobile entraîné par un galet coopérant avec la gorge à profil en came d'une vis-mère entraînée elle-même par un moteur pas-à-pas.In fact, these machines position the cathode relative to the grid G1 by first inserting a probe of fixed length between the cathode and the grid G1, the cathode being disposed on a fixed support, and the barrel on a mobile support driven by a roller cooperating with the groove in cam profile of a lead screw itself driven by a stepping motor.

Un premier palier de cette gorge détermine la position de mesure et de réglage en position de la cathode, puis le canon est reculé, le palpeur dégagé, et le canon avancé d'une distance égale à celle dont il a reculé, augmentée de la longueur du palpeur, et arrive en position de soudage de la cathode dans l'oeillet du canon, cette position étant déterminée également par un palier de la gorge. Ainsi, toute modification du réglage de la machine nécessite le démontage du palpeur et son ré-usinage à une nouvelle cote. Le dispositif d'entraînement à vis-mère et galet est peu précis : la gorge de la vis-mère doit être exempte de toutes poussières ou débris, ce qui est difficile à obtenir en milieu industriel ; même si le moteur pas-à-pas s'arrête de façon précise dans la position angulaire désirée, le dispositif d'accouplement avec la vis-mère qu'il entraîne présente des jeux difficiles à prendre en compte ; les efforts exercés sur le galet aussi bien par le chariot porte-canon que par la vis-mère font que les jeux de cette transmission de mouvement sont répercutés au niveau du chariot. En outre, si l'oeillet de cathode est désaxé, le palpeur risque de déformer l'oeillet, ou alors le palpeur doit être réalisé en matière déformable.A first bearing of this groove determines the position of measurement and adjustment in position of the cathode, then the barrel is moved back, the probe released, and the barrel advanced by a distance equal to that from which it moved back, increased by the length of the feeler, and arrives in the welding position of the cathode in the eyelet of the barrel, this position also being determined by a bearing in the groove. Thus, any modification of the machine setting requires dismantling the probe and re-machining it to a new dimension. The drive device with lead screw and roller is imprecise: the groove in the lead screw must be free of any dust or debris, which is difficult to obtain in an industrial environment; even if the stepping motor stops in a precise manner in the desired angular position, the coupling device with the lead screw which it drives presents plays which are difficult to take into account; the forces exerted on the roller both by the barrel carriage and by the lead screw mean that the games of this motion transmission is passed on to the carriage. In addition, if the cathode eyelet is offset, the probe may deform the eyelet, or the probe must be made of deformable material.

La présente invention a pour objet une machine d'implantation de cathode dans un canon de tube cathodique qui soit rapide, précise et fidèle, simple, et dont la tige du palpeur n'ait pas besoin d'être déformable, sans pour autant risquer une déformation de l'oeillet de cathode.The subject of the present invention is a cathode implantation machine in a cathode ray tube barrel which is rapid, precise and faithful, simple, and the probe rod of which does not need to be deformable, without risking a deformation of the cathode eyelet.

La machine conforme à l'invention pour l'implantation d'une cathode dans un oeillet d'un canon de tube cathodique présente les caractéristiques de la revendication 1.The machine according to the invention for implanting a cathode in an eyelet of a cathode ray tube barrel has the characteristics of claim 1.

La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation, pris à titre d'exemple non limitatif, et illustré par le dessin annexé, sur lequel :

  • La figure 1 est une vue de côté simplifiée d'une machine conforme à l'invention,
  • La figure 2 est une vue en coupe du palpeur de la figure 1, avec son dispositif pneumatique de commande, et
  • La figure 3 est un ensemble de vues en coupe du palpeur des figures 1 et 2 à des stades différents de son fonctionnement.
The present invention will be better understood on reading the detailed description of an embodiment, taken by way of nonlimiting example, and illustrated by the appended drawing, in which:
  • FIG. 1 is a simplified side view of a machine according to the invention,
  • FIG. 2 is a sectional view of the probe of FIG. 1, with its pneumatic control device, and
  • Figure 3 is a set of sectional views of the probe of Figures 1 and 2 at different stages of sound operation.

La machine schématiquement représentée en figure 1 comporte un dispositif 1 de support mobile pour un canon à électrons 2 de tube cathodique, un palpeur 3 à tige rétractable, et un dispositif 4 de support de cathode 5. En position de mesure, telle que représentée en figure 1, le palpeur 3 et la cathode 5 sont disposés dans l'axe 6 du canon. Le dispositif de support 1 déplace le canon 2 toujours selon son axe 6.The machine schematically represented in FIG. 1 comprises a device 1 for movable support for an electron gun 2 for cathode ray tube, a probe 3 with retractable rod, and a device 4 for cathode support 5. In the measurement position, as shown in Figure 1, the probe 3 and the cathode 5 are arranged in the axis 6 of the barrel. The support device 1 moves the barrel 2 always along its axis 6.

Le dispositif de support 1 comporte un chariot 7 portant, de façon connue en soi, le canon 2. Le chariot 7 se déplace sur un dispositif 8 à glissière sous l'action d'un vérin 9. Le dispositif 8 comporte deux butées réglables 10,11 déterminant respectivement une position fixe postérieure et une position fixe antérieure. Comme expliqué plus en détail ci-dessous, le cycle machine ne détermine que deux mouvements du chariot 7 : de la butée 10 vers la butée 11, et retour, alors que le cycle de la machine de l'art antérieur comportait quatre mouvements déterminés par une vis-mère.The support device 1 comprises a carriage 7 carrying, in a manner known per se, the barrel 2. The carriage 7 moves on a device 8 with a slide under the action of a jack 9. The device 8 comprises two adjustable stops 10 , 11 respectively determining a posterior fixed position and an anterior fixed position. As explained in more detail below, the machine cycle only determines two movements of the carriage 7: from the stop 10 to the stop 11, and back, while the machine cycle of the prior art included four movements determined by a screw mother.

Le palpeur 3 de forme générale cylindrique, est monté sur un dispositif de support 12 mobile perpendiculairement à l'axe 6 entre une position de mesure, pour laquelle l'axe du palpeur est confondu avec l'axe 6, comme représenté sur la figure 1 et une position de dégagement. Le palpeur 3 comporte essentiellement une tige de mesure rétractable 13 mue par un piston 14 se déplaçant dans la chambre formée par le corps cylindrique 15 du palpeur, et à l'autre extrémité, un dispositif de mesure de distance 16 faisant face, en position de mesure, à la face active de la cathode 5. En position de dégagement, la tige de mesure 13 du palpeur est rétractée. Lorsque le palpeur 3 arrive en position de mesure, sa tige est sortie pour venir en contact avec la première grille G1 du canon 2.The probe 3 of generally cylindrical shape, is mounted on a support device 12 movable perpendicular to the axis 6 between a measurement position, for which the probe axis is coincident with the axis 6, as shown in Figure 1 and a release position. The probe 3 essentially comprises a retractable measuring rod 13 moved by a piston 14 moving in the chamber formed by the cylindrical body 15 of the probe, and at the other end, a distance measuring device 16 facing, in the position of measurement, at the active face of the cathode 5. In the disengaged position, the measuring rod 13 of the probe is retracted. When the probe 3 reaches the measurement position, its rod is extended to come into contact with the first grid G1 of the barrel 2.

On va maintenant décrire plus en détail le palpeur de mesure 3 et son dispositif d'actionnement, en référence à la figure 2, sur laquelle le palpeur est représenté en position de mesure. Le dispositif palpeur décrit ici est du type à commande pneumatique, mais il est bien entendu que l'invention n'est pas limitée à un tel palpeur, et que tout palpeur remplissant la même fonction, à tige rétractable pour la mesure de la distance entre la première grille du canon et la cathode, peut convenir, par exemple un palpeur à commande électromagnétique, hydraulique, etc...We will now describe in more detail the measuring probe 3 and its actuating device, with reference to FIG. 2, in which the probe is shown in the measuring position. The feeler device described here is of the control type pneumatic, but it is understood that the invention is not limited to such a probe, and that any probe fulfilling the same function, with retractable rod for measuring the distance between the first barrel grid and the cathode, can suitable, for example a probe with electromagnetic, hydraulic control, etc.

Le corps 15 du palpeur 3 est monté mobile en translation axiale par rapport à son support 12 grâce à un palier à billes 17. Cette translation est limitée d'un côté - côté dispositif 16 - par un épaulement 18 du corps 15, et de l'autre côté par un ressort en boudin 19 disposé autour du corps 15, et s'appuyant contre une bague-capuchon 20 vissée à l'extrémité du corps 15 laissant passer la tige 13 de façon non étanche et faisant office de butée réglable pour le piston 14. L'autre extrémité du corps 15 est fermée, et un ressort en boudin 21, disposé à l'intérieur du corps 15, s'appuie contre cette extrémité fermée et empêche le piston 14 de buter trop brutalement contre cette extrémité dans son mouvement de retrait.The body 15 of the probe 3 is mounted movable in axial translation relative to its support 12 by means of a ball bearing 17. This translation is limited on one side - device side 16 - by a shoulder 18 of the body 15, and of the 'other side by a coil spring 19 disposed around the body 15, and pressing against a cap-ring 20 screwed to the end of the body 15 allowing the rod 13 to pass in leaktight manner and acting as an adjustable stop for the piston 14. The other end of the body 15 is closed, and a coil spring 21, disposed inside the body 15, bears against this closed end and prevents the piston 14 from abutting too abruptly against this end in its withdrawal movement.

Le corps 15 du palpeur est percé, près de l'extrémité sur laquelle s'appuie le ressort 21, d'un trou radial 22 relié par une conduite 23 à un dispositif 24 de commande pneumatique. Sur cette extrémité est vissé, avec possibilité de réglage, un capuchon 25 percé d'un trou radial 26 communiquant avec un trou axial calibré 27 débouchant face à la cathode 5. Le trou 26 est relié à un dispositif 28 de mesure, non représenté en détail, à jauge à air et source de pression pneumatique, de type connu en soi.The body 15 of the feeler is pierced, near the end on which the spring 21 rests, with a radial hole 22 connected by a pipe 23 to a pneumatic control device 24. On this end is screwed, with the possibility of adjustment, a cap 25 pierced with a radial hole 26 communicating with a calibrated axial hole 27 opening facing the cathode 5. The hole 26 is connected to a measuring device 28, not shown in detail, with air gauge and pneumatic pressure source, of a type known per se.

Comme représenté sur la figure 2, en position de mesure, le piston 14 vient en butée contre le capuchon 20, sa tige 13 étant en appui contre le première grille G1 du canon 2, dont on a seulement représenté, outre G1, la deuxième grille G2 et l'oeillet de cathode 29 dans lequel doit être soudée la cathode 5 après réglage de sa distance à la grille G1. Cette distance peut être réglée par exemple par déplacement axial de la cathode ou du canon de façon à obtenir une valeur déterminée avec le dispositif 28. Ainsi, la longueur du palpeur 3 - depuis l'extrémité de la tige 13, le piston 14 étant en butée contre le capuchon 20, jusqu'à l'embouchure du trou 27 - étant égale à la course du chariot 7 entre les butées 10 et 11, et la distance entre l'embouchure du trou 27 et la face active de la cathode 5 est ajustée grâce à l'appareil de mesure 28 pour être égale à la distance recherchée entre la grille G1 et cette face active de la cathode 5.As shown in FIG. 2, in the measurement position, the piston 14 abuts against the cap 20, its rod 13 being in abutment against the first grid G1 of the barrel 2, of which the second grid has only been shown, in addition to G1 G2 and the cathode eyelet 29 into which the cathode 5 must be welded after adjusting its distance from the grid G1. This distance can be adjusted for example by axial displacement of the cathode or the barrel so as to obtain a determined value with the device 28. Thus, the length of the probe 3 - from the end of the rod 13, the piston 14 being in abutment against the cap 20, to the mouth of the hole 27 - being equal to the stroke of the carriage 7 between the stops 10 and 11, and the distance between the mouth of the hole 27 and the active face of the cathode 5 is adjusted using the measuring device 28 to be equal to the distance sought between the grid G1 and this face cathode active 5.

On va maintenant décrire le dispositif de commande 24. Ce dispositif 24 comporte une source de haute pression pneumatique 30 reliée par un premier inverseur 31 soit à une conduite 32, soit à une conduite 33. La conduite 32 est reliée par un dispositif 34 de réglage de débit à l'entrée d'un dispositif Venturi 35. Le dispositif 34 comporte un étranglement réglable 36 en parallèle avec un clapet anti-retour 37, ce dernier étant passant dans le sens 35 vers 32. La sortie d'aspiration d'air du Venturi 35 est reliée à une première entrée 38 d'un tiroir pneumatique 39 dont la sortie 40 est reliée au trou 22 du palpeur 3. La conduite 33 est directement reliée à la deuxième entrée 41 du tiroir 39.The control device 24 will now be described. This device 24 comprises a pneumatic high pressure source 30 connected by a first reverser 31 either to a pipe 32 or to a pipe 33. The pipe 32 is connected by a regulating device 34 flow rate at the inlet of a Venturi device 35. The device 34 has an adjustable throttle 36 in parallel with a non-return valve 37, the latter passing in the direction 35 to 32. The air suction outlet of the Venturi 35 is connected to a first inlet 38 of a pneumatic drawer 39, the outlet 40 of which is connected to the hole 22 of the probe 3. The pipe 33 is directly connected to the second inlet 41 of the drawer 39.

Le tiroir 39 comporte deux entrées de commande 42,43. Lorsque l'entrée 42 reçoit une haute pression pneumatique, l'entrée 38 est mise en communication avec la sortie 40, et lorsque l'entrée 43 reçoit cette haute pression, c'est l'entrée 41 qui est mise en communication avec la sortie 40.The drawer 39 has two control inputs 42,43. When the inlet 42 receives a high pneumatic pressure, the inlet 38 is placed in communication with the outlet 40, and when the inlet 43 receives this high pressure, it is the inlet 41 which is brought into communication with the outlet 40.

La source 30 est reliée d'autre part par un deuxième inverseur 44 soit à une conduite 45, soit à une conduite 46. La conduite 45 est directement reliée à l'entrée de commande 42 du tiroir 39. La conduite 46 est reliée, d'une part directement à l'entrée de commande 43, et d'autre part à l'entrée 41 par un dispositif 47 de réglage de débit suivi d'un clapet anti-retour 48. Le dispositif 47 comporte un étranglement réglable 49 en parallèle avec un clapet anti-retour 50. Les clapets 48 et 50 sont passants dans le sens 46 vers 41, et 41 vers 46 respectivement.The source 30 is connected on the other hand by a second inverter 44 either to a pipe 45 or to a pipe 46. The pipe 45 is directly connected to the control input 42 of the drawer 39. The pipe 46 is connected, d on the one hand directly to the control input 43, and on the other hand to the input 41 by a device 47 for adjusting the flow rate followed by a non-return valve 48. The device 47 comprises an adjustable throttle 49 in parallel with a non-return valve 50. The valves 48 and 50 pass in the direction 46 to 41, and 41 to 46 respectively.

On va maintenant expliquer, en référence aux figures 2 et 3, le fonctionnement détaillé du palpeur 3 et de son dispositif de commande 24. Le palpeur 3 étant en position de mesure, à la fin de la mesure, les deux inverseurs 31 et 44 sont actionnés, par un dispositif non représenté, de façon à se trouver dans la position inverse de celle représentée sur la figure 2, c'est-à-dire en faisant communiquer la source 30 avec les conduites 32 et 45. Le tiroir 39, actionné par la commande 42, se trouve dans la position représentée en trait interrompu sur la figure 2, c'est-à-dire qu'il fait communiquer 38 avec 40. La haute pression arrivant par la conduite 32 passe par 34 et crée une dépression à la sortie du Venturi 35, qui est transmise au trou 22 du palpeur. Cette dépression fait donc reculer le piston 14, dont la vitesse de recul est fonction du réglage de 36, jusqu'au contact avec le ressort 21 qui amortit la fin de son parcours. A la fin de cette phase, le palpeur 3 se trouve dans la position représentée en ligne A sur la figure 3. Le palpeur est alors dégagé par un mouvement de retrait de son support 12, le chariot 7, qui était en appui contre la butée 10, est actionné par le vérin 9 et vient en appui contre la butée 11. La cathode 5 est ainsi introduite dans l'oeillet 29 et y est soudée, par exemple par un dispositif de soudage à lasers, non représenté. Le canon 2 est enlevé par un dispositif de manipulation non représenté et remplacé par un autre canon 2ʹ sans cathode, et une autre cathode 5ʹ est placée sur le support 4.We will now explain, with reference to FIGS. 2 and 3, the detailed operation of the probe 3 and of its control device 24. The probe 3 being in the measurement position, at the end of the measurement, the two inverters 31 and 44 are actuated by a device not shown, so as to be in the opposite position to that shown in FIG. 2, that is to say by making the source 30 communicate with the conduits 32 and 45. The drawer 39, actuated by the control 42, is in the position shown in broken lines in Figure 2, that is to say that it communicates 38 with 40. The high pressure arriving through line 32 passes through 34 and creates a vacuum at the outlet of Venturi 35, which is transmitted to hole 22 of the probe. This depression therefore causes the piston 14 to move back, the recoil speed of which depends on the setting of 36, until contact with the spring 21 which dampens the end of its travel. At the end of this phase, the probe 3 is in the position shown in line A in Figure 3. The probe is then released by a movement of withdrawal of its support 12, the carriage 7, which was in abutment against the stop 10, is actuated by the jack 9 and bears against the stop 11. The cathode 5 is thus introduced into the eyelet 29 and is welded to it, for example by a laser welding device, not shown. The barrel 2 is removed by a handling device not shown and replaced by another barrel 2ʹ without cathode, and another cathode 5ʹ is placed on the support 4.

La position de l'inverseur 44 seulement est modifiée, et il fait alors communiquer la source 30 avec la conduite 46. La pression de la source 30 est toujours envoyée au Venturi 35 via le dispositif 34, mais étant donné que le tiroir 39 change d'état - car l'inverseur 44 change d'état); la dépression créée par le Venturi n'a aucun effet sur le palpeur. Par ailleurs, la pression de la source 30, qui est envoyée à la conduite 46, arrive à l'entrée de commande 43 et fait donc changer d'état le tiroir 39, comme on vient de le préciser. D'autre part, la pression arrivant par la conduite 46 passe par le dispositif 47, le clapet 48, et parvient donc sous faible débit au trou 22 via 41,40 et 23. Cette faible pression pneumatique pousse le piston 14 vers le capuchon 20, mais étant donné que le débit d'air arrivant par le trou 40 est réglé par l'organe 49 pour être légèrement inférieur aux fuites se produisant au niveau du passage de la tige 13 dans le capuchon 20, le mouvement du piston est relativement lent, et sa tige 13 accoste en douceur la grille G1, alors que le piston 14 n'est pas encore en butée contre le capuchon 20, figure 3, ligne B.The position of the inverter 44 only is modified, and it then causes the source 30 to communicate with the line 46. The pressure from the source 30 is always sent to the Venturi 35 via the device 34, but since the drawer 39 changes d 'state - because the inverter 44 changes state); the depression created by the Venturi has no effect on the probe. Furthermore, the pressure from the source 30, which is sent to the pipe 46, arrives at the control input 43 and therefore causes the drawer 39 to change state, as has just been specified. On the other hand, the pressure arriving through the pipe 46 passes through the device 47, the valve 48, and therefore reaches the hole 22 at low flow rate via 41.40 and 23. This low pneumatic pressure pushes the piston 14 towards the cap 20, but since the air flow arriving through the hole 40 is adjusted by the member 49 to be slightly less than the leaks occurring at the level of the passage of the rod 13 in the cap 20, the movement of the piston is relatively slow, and its rod 13 approaches gently the grid G1, while the piston 14 is not yet in abutment against the cap 20, FIG. 3, line B.

Ensuite, on inverse l'état de l'inverseur 31, sans modifier celui de l'inverseur 44. La haute pression de la source 30 passe alors par la conduite 33, et de là parvient au palpeur via 40 et 41. Le débit d'air est alors nettement supérieur auxdites fuites, ce qui repousse le piston 14 jusqu'en butée contre le capuchon 20. La tige 13, étant en butée contre G1, ne peut plus avancer, ce qui force le corps 15 du palpeur à reculer vers la cathode en comprimant le ressort 19. Le palpeur 3 est alors dans la position représentée en ligne C de la figure 3. Un dispositif automatique de réglage à vis micrométrique, non représenté, déplace le canon 2ʹ par rapport à son chariot-support 7, de façon à obtenir la valeur de consigne désirée - ce peut être par exemple un réglage à zéro - avec l'appareil de mesure 28, c'est-à-dire la distance G1-cathode désirée.Then, the state of the inverter 31 is reversed, without modifying that of the inverter 44. The high pressure of the source 30 then passes through the line 33, and from there reaches the probe via 40 and 41. The flow d air is then clearly superior to said leaks, which pushes the piston 14 as far as it stops against the cap 20. The rod 13, being in abutment against G1, can no longer advance, which forces the body 15 of the probe to move back towards the cathode by compressing the spring 19. The probe 3 is then in the position shown in line C in FIG. 3. An automatic micrometric screw adjustment device, not shown, moves the barrel 2ʹ relative to its support carriage 7, so as to obtain the desired reference value - this can for example be a zero setting - with the measuring device 28, that is to say the desired distance G1-cathode.

Ensuite, on change la position de l'inverseur 44 sans modifier celle de l'inverseur 31. La source 30 est alors en communication avec l'entrée de commande 42, ce qui actionne le tiroir 39 et met en communication 38 et 40. La conduite 33 est ainsi obturée en 41, et la source 30 ne communique ni avec 38 ni avec 41. L'entrée 38 se trouve mise à la pression atmosphérique environnante via le Venturi 31, ce qui fait que l'air comprimé contenu dans le corps 15 du palpeur s'échappe vers l'extérieur. Le ressort 19 se détend et pousse le palpeur vers le canon 2ʹ, puisque la tige 13 est toujours en butée contre G1. Le palpeur est alors dans la position représentée en ligne D de la figure 3, c'est-à-dire pratiquement la même position qu'il avait lors de l'envoi d'un faible débit d'air, ligne B de la figure 3.Then, the position of the inverter 44 is changed without modifying that of the inverter 31. The source 30 is then in communication with the control input 42, which actuates the drawer 39 and puts in communication 38 and 40. The pipe 33 is thus closed at 41, and the source 30 communicates neither with 38 nor with 41. The inlet 38 is brought to the surrounding atmospheric pressure via the Venturi 31, so that the compressed air contained in the body 15 of the probe escapes to the outside. The spring 19 relaxes and pushes the probe towards the barrel 2ʹ, since the rod 13 is always in abutment against G1. The feeler is then in the position shown in line D in FIG. 3, that is to say practically the same position as it had when sending a low air flow, line B in FIG. 3.

Enfin, on inverse la position de l'inverseur 31, sans modifier celle de l'inverseur 44. On revient donc dans la situation de départ pour laquelle une dépression était créée dans le corps 15 du palpeur. Le piston 14 recule donc vers la cathode 5ʹ, et le palpeur se trouve dans la position représentée en ligne E de la figure 3, c'est-à-dire la même position qu'en ligne A de cette figure, et on recommence le cycle décrit ci-dessus.Finally, the position of the inverter 31 is reversed, without modifying that of the inverter 44. We therefore return to the initial situation for which a depression was created in the body 15 of the probe. The piston 14 therefore moves back towards the cathode 5ʹ, and the feeler is in the position shown in line E in FIG. 3, that is to say the same position as in line A in this figure, and the operation is repeated. cycle described above.

La tige 13 du palpeur 3 est dans un mode de réalisation préféré, en un métal ou alliage trempé et rectifié ne se déformant pas. Si un oeillet est désaxé ou décentré, la tige ne se déforme pas et se rétracte, car l'oeillet offre alors une résistance suffisante vis-à-vis de la pression exercée par le piston et ne se déforme pas. De préférence, la machine comporte un capteur approprié, non représenté, détectant cette anomalie, par exemple par le retrait anticipé de la tige, et déclenchant une alarme et/ou actionnant un dispositif d'éjection du canon défectueux.The rod 13 of the probe 3 is in a preferred embodiment, in a hardened and rectified metal or alloy which does not deform. If an eyelet is off-center or off-center, the rod does not deform and retracts, because the eyelet then offers sufficient resistance to the pressure exerted by the piston and does not deform. Preferably, the machine includes an appropriate sensor, not shown, detecting this anomaly, for example by the early withdrawal of the rod, and triggering an alarm and / or actuating a defective barrel ejection device.

Claims (3)

  1. Machine for mounting a cathode (5) in a lug (29) of a gun (2) of a cathode tube, machine which includes a device for the movable support (1) wich supports the gun, said device for the movable support moving it in the direction of its axis (6) and being movable between two fixed positions (10, 11) and a sensor (3) equipped with a retractable device (12) which moves it perpendicularly to the axis, machine characterized in that said sensor has a cylinder (15) in which a piston (14) moves and on which a sensor rod (13) is fixed, this rod coming out of a first end (20) of said cylinder to come into contact with a first grid (G1) of the gun and that the other end of the cylinder (15) has a measuring device (16) which measures the distance up to the active face of said cathode (5) when the cathode and said sensor (3) are placed on the axis (6) and said piston (14) abuts against the end (20) through which the rod (13) arises.
  2. Machine according to claim 1, characterized in that the length of said sensor (3) is equal to the distance at which said device for the movable support (1) moves between said both fixed positions (10, 11).
  3. Machine according to claim 1, characterized in that said sensor (3) is controlled by a device (24) for pneumatic control which sends successively a depression, air with low throughput and then with high throughput, and that it is at last set to the ambient atmospheric pressure.
EP88400605A 1987-03-20 1988-03-15 Cathode inserter for a crt Expired - Lifetime EP0288335B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703922A FR2612690B1 (en) 1987-03-20 1987-03-20 CATHODE IMPLANTATION MACHINE IN A CATHODE TUBE CANNON
FR8703922 1987-03-20

Publications (2)

Publication Number Publication Date
EP0288335A1 EP0288335A1 (en) 1988-10-26
EP0288335B1 true EP0288335B1 (en) 1992-12-16

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Application Number Title Priority Date Filing Date
EP88400605A Expired - Lifetime EP0288335B1 (en) 1987-03-20 1988-03-15 Cathode inserter for a crt

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US (1) US4850920A (en)
EP (1) EP0288335B1 (en)
DE (1) DE3876672T2 (en)
FR (1) FR2612690B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5295887A (en) * 1993-06-16 1994-03-22 Zenith Electronics Corporation K-G1 electrode spacing system for a CRT electron gun

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1860640A (en) * 1931-02-13 1932-05-31 Lufkin Rule Co Telescoping gauge
US2869243A (en) * 1957-01-15 1959-01-20 Sheffield Corp Gaging apparatus
US2864935A (en) * 1957-07-01 1958-12-16 Sylvania Electric Prod Apparatus for spacing and uniting parts
US3533147A (en) * 1968-07-19 1970-10-13 Zenith Radio Corp Cathode inserting machine and process
US3584182A (en) * 1969-05-29 1971-06-08 Griffiths Electronics Inc Method and apparatus for precision loading and welding of components in an electron device
US3848301A (en) * 1972-11-06 1974-11-19 Rca Corp Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube
US4015315A (en) * 1975-07-14 1977-04-05 Rca Corporation Method of setting cathode-G1 spacing
DE3035970C2 (en) * 1980-09-24 1982-11-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Method for adjusting the electrode spacing in beam generation systems of cathode ray tubes

Also Published As

Publication number Publication date
EP0288335A1 (en) 1988-10-26
DE3876672D1 (en) 1993-01-28
FR2612690B1 (en) 1989-05-26
DE3876672T2 (en) 1993-04-22
FR2612690A1 (en) 1988-09-23
JPS64629A (en) 1989-01-05
US4850920A (en) 1989-07-25

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