EP0209438B1 - Dispositif de soudage de cathode pour canon à électrons - Google Patents

Dispositif de soudage de cathode pour canon à électrons Download PDF

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Publication number
EP0209438B1
EP0209438B1 EP19860401456 EP86401456A EP0209438B1 EP 0209438 B1 EP0209438 B1 EP 0209438B1 EP 19860401456 EP19860401456 EP 19860401456 EP 86401456 A EP86401456 A EP 86401456A EP 0209438 B1 EP0209438 B1 EP 0209438B1
Authority
EP
European Patent Office
Prior art keywords
welding
needle
support
rod
cathode
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
Application number
EP19860401456
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0209438A1 (fr
Inventor
Daniel Cote
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
Publication of EP0209438A1 publication Critical patent/EP0209438A1/fr
Application granted granted Critical
Publication of EP0209438B1 publication Critical patent/EP0209438B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J9/02—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 welding device for an electron gun mainly applicable to the field of manufacturing color television tubes.
  • the mounting machine includes a cathode insertion mechanism and allows firstly to adjust the distances between each electrode making up the barrel, to place a cathode rod in its support and then to immobilize the assembly, possibly after a check dimensional, on the one hand by welding the cathode rod into its support, on the other hand, by beading the different electrodes of the barrel together.
  • the finished product is an electron gun ready for assembly with the rest of a color television tube, for example.
  • Such machines are described in particular in document FR-A 2 205 738 which relates to a method of assembling an electrode in a cathode-ray tube.
  • the different stages of an assembly process are reported.
  • a welding assembly is described comprising four air cylinders and four welding guns extending radially towards the position for fixing the cathode rod in its support.
  • the air cylinders operate at a given instant under the action of an operator so as to apply pressure by the welding guns also called welding needles.
  • the present invention relates to a cathode welding device for an electron gun, the cathode mainly comprising a rod in an envelope, the device being of the type where at least one head carries out welding by pressing, each welding head being located laterally relative to the envelope and comprising a welding needle mounted in a support and provided with a first pneumatic-type motor device acting by means of a piston mounted on a shaft coaxial with the movement of the needle, thus achieving a contact pressure of the needle on the envelope, the device is characterized in that it comprises a second motor device mounted on the needle support shaft and actuated by the same piston to then produce a welding pressure , said second device being of the tarable spring type.
  • FIG. 1 there is shown a welding device according to the prior art.
  • the cathode 13 comprises, at the level of the welding concerned by the invention, a rod 14 disposed in a casing 15.
  • the rod 14 comprises two cylindrical bodies connected to each other, the first cylindrical body coming by force into the cylindrical envelope of the support 15.
  • the assembly is coaxial with the axis 16 which will be the central axis of emission of electrons for the completely finished barrel.
  • a welding head Perpendicular to axis 16, along axis 17 a welding head mainly composed of a support 1 and a needle 10 acts along axis 17.
  • the needle receives no motor effect d a pneumatic machine 6 in a chamber 2.
  • the pneumatic machine 6 exerts a docking and welding pressure which performs the welding operation.
  • the needle 10 is mounted in a part 18 of a carriage 3 which slides in an opening 19 of the support 1.
  • the rear part of the carriage 3 receives the fixing of a shaft 9, for example fixed in a threaded hole by the through a threaded end of this shaft.
  • the shaft transverses a suitable opening of the support 1 to arrive on a piston 4 arranged in a compression chamber 2.
  • a pneumatic machine 5-8 makes it possible to bring the pressures so as to carry out the welding operation. An operator manually controls these operations.
  • FIG. 2 The invention addresses these drawbacks by proposing in FIG. 2 in particular a particularly efficient embodiment.
  • the same cathode assembly 13 is shown therein consisting of the rod 14 in its envelope 15.
  • the needle 10 is mounted on a support 22.
  • a first motor device 25-31 makes it possible to exert a pressure for approaching the needle on the envelope. It is thus possible to control by electro-pneumatic means that the needle arrives on the envelope 15 with a suitable speed.
  • a second motor device 23-23A then produces a welding pressure.
  • the first motor device shown in the drawing mainly consists of a pneumatic machine 30, 31 suitably controlled which actuates a piston 29 in a chamber 27.
  • the piston 29 is mounted at one end of a longitudinal shaft 28 which enters a chamber 24 of a needle holder 22.
  • the shaft 28 is aligned with axis 17 of movement of the needle.
  • the other end of the shaft 28 consists of a threaded part 32 mounted in a threaded hole of a means for calibrating the docking pressure. This means for setting the docking pressure makes it possible to adjust a fraction of the docking pressure as desired without varying the electro-pneumatic device which is more difficult to adjust.
  • the calibration means comprises a part 33 which is movable in rotation from the outside of the device so as to produce a relative displacement of the needle 10 and of the shaft 28. It will be appreciated that thus the pressure d docking can change without the electro-pneumatic machine 30, 31 being modified.
  • the setting means comprises a body 33 integral with the mobile part in rotation, the end opposite to the part in contact with the shaft 28 is externally threaded so as to be mounted in a support 21 of the needle 10.
  • the needle 10 is fixed to support 21 and can move inside of it by rotation of part 33 of the taring means.
  • the body 33 is hollow so as to allow the body 20 of the needle 10 to advance.
  • the body of the needle 20 has a first shoulder 23A which makes it possible to receive a second motor device intended to exert the pressure of welding.
  • the second motor device 23 is disposed inside the support 21 between the shoulder 23A and a fixed part 33 relative to the support 22.
  • This motor device is an elastic means which is actuated by a second action of the electro-pneumatic device 31, 30.
  • the fixed part 33 is constituted by the means for setting the docking pressure.
  • the electro-pneumatic machine 30, 31 emits a first docking pressure with a suitable calibration of the means 33.
  • the needle passes from the high position 11 to the welding position 12.
  • a second pressure is emitted by the electro-pneumatic device 30, 31 so as to cause the second motor device constituted by the spring 23 to act.
  • the shoulder portion 23A of the body 20 of the needle 10 is moved towards the inside of the support 21, the other end of the spring 23 being fixed by the end of the body 33 of the calibration means.
  • the setting means 33 is in fact fixed by a thread 25 to the support 21 which slides in the support 22.
  • a welding device can comprise a single head rotating around the cathode to be welded at three or four welding points for example.
  • the welding device comprises three coplanar welding heads distributed around the welding gun.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Welding (AREA)
EP19860401456 1985-07-09 1986-07-01 Dispositif de soudage de cathode pour canon à électrons Expired - Lifetime EP0209438B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8510482A FR2584859B1 (fr) 1985-07-09 1985-07-09 Dispositif de soudage de cathode pour canon a electrons
FR8510482 1985-07-09

Publications (2)

Publication Number Publication Date
EP0209438A1 EP0209438A1 (fr) 1987-01-21
EP0209438B1 true EP0209438B1 (fr) 1990-03-28

Family

ID=9321110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860401456 Expired - Lifetime EP0209438B1 (fr) 1985-07-09 1986-07-01 Dispositif de soudage de cathode pour canon à électrons

Country Status (5)

Country Link
EP (1) EP0209438B1 (ja)
JP (1) JPH06105592B2 (ja)
DE (1) DE3669949D1 (ja)
FR (1) FR2584859B1 (ja)
IN (1) IN166316B (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4417625C2 (de) * 1994-05-19 1999-05-20 Amatech Gmbh & Co Kg Vorrichtung zur Aufnahme und Führung einer Verbindungseinrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559547A (en) * 1949-10-12 1951-07-03 Superior Tube Co Machine for making an electrode assembly
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

Also Published As

Publication number Publication date
JPS6212029A (ja) 1987-01-21
EP0209438A1 (fr) 1987-01-21
FR2584859A1 (fr) 1987-01-16
DE3669949D1 (de) 1990-05-03
IN166316B (ja) 1990-04-07
JPH06105592B2 (ja) 1994-12-21
FR2584859B1 (fr) 1988-12-09

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