JPH06105592B2 - Cathode welding device for electron gun - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode welding apparatus for an electron gun, and more particularly to an apparatus used in manufacturing an image pickup tube of a color television.

(Prior Art) In manufacturing an electron gun, a welding head is used as a tool for assembling various components of the electron gun. The machine for assembling consists of a machine for inserting the cathode, first between the electrodes in the electron gun for setting the cathode rod on the support and the electrode for fixing the unit when necessary after checking the plane. Used to adjust the distance. In this operation, first, the electrode rod is welded into the support, and then the electrodes of various electron guns are bead-welded to the other surface. The finished product is an electron gun which is convenient for assembling, for example, the base of an image pickup tube of a color television.

Such a machine is disclosed in particular in French Patent No. 2 205 738, which describes a method for assembling electrodes in a cathode ray tube. The various steps in the method of assembly are described in the above-referenced document. In particular, a welding unit is described which consists of four cylinders and four welding guns which spread radially with respect to the position where the cathode is firmly fixed to the support. The air cylinder is moved by the operator at a known moment. The pressure is supplied by a welding gun called a welding needle.

One of the objects of the present invention is to broaden the welding process by providing a new method which seeks to eliminate the drawback that the cathode is welded and bonded at the same time. Another advantage of the present invention is that the welding equipment can be automated.

SUMMARY OF THE INVENTION The present invention relates to a cathode welding apparatus for an electron gun, the cathode consisting of an electron emitting rod mounted in a metal vacuum vessel. This device is of the type in which several heads carry out the welding, in particular each welding head is located laterally to the vacuum vessel and consists of a welding needle mounted in a support. This device is attached to a first drive device for supplying a pressure for attaching a welding needle to a vacuum container and a second drive device for supplying a welding pressure.

(Embodiment) The present invention eliminates the above-mentioned drawbacks, and a particularly effective embodiment is shown in FIG. The figure shows a cathode unit 13 consisting of a rod 14 in a vacuum vessel 15. A support 22 is attached to the welding needle 10. The first drive devices 25-31 pressurize the vacuum vessel to affect the welding needle. Then, it is possible to confirm by electric compression means that the welding needle comes to the vacuum container 15 at a predetermined speed. Second drive device 2
3,23a supplies the pressure for welding.

The first drive device shown comprises in particular a compression device 30, 31 for moving the piston 29 in the chamber 27 for optimum control. A piston 29 is attached to one end of a vertical shaft 28 which extends through a chamber 24 of the needle support 22. The shaft 28 is aligned with the axis 17 of movement of the needle. The other end of the shaft 28 is composed of a screw-in member 32 attached to the screw hole of the pressure adjusting unit. The pressurization adjustment unit is capable of finely adjusting the pressurization arbitrarily, except that it causes fluctuations in the electric compression device which are more difficult to adjust. For this purpose, the adjusting unit has a part 33 which is pivotable from an external device. This is because the relative position between the needle 10 and the shaft 28 causes a fluctuation. The pressurization can be changed without the limitation of the electric compression device 30. The adjusting unit consists of a casing 33 which forms one part with the pivoting part. One end of the movable piece, which is on the side opposite to the part in contact with the shaft 28, is screwed outward. I mean,
This is because the one component is attached to the support 21 of the needle 10. The needle 10 is firmly fixed to the support 21 and can be moved inside the support 21 by pivoting the member 33 of the adjusting device. As a result, the caging 33 is recessed. This is because the barrel 20 of the needle 10 can move along the support. The needle barrel 20 comprises a main shoulder 23a which constitutes a second drive for applying the welding pressure.

The second drive device 23 is set in the support 21 between a portion 33 attached to the support 22 and the shoulder 23a. This drive is a resilient unit which is moved by the second movement of the electric compressor 30,31. In the present embodiment shown in the figure, the attached member 33 constitutes a pressure adjusting unit.

In order to perform the welding, the electric compression device 30, 31 is a unit 33.
The main pressure is applied for optimum adjustment. The needle moves from the initial position 11 to the welding position 12. Then, the second pressure is applied by the electric compression devices 30 and 31. This is because the second drive consisting of the spring 23 operates. The member 23a of the support 20 of the needle 10 moves along the inside of the support 21. On the other hand, the other end of the spiral spring 23 is firmly fixed by one end of a caging 33 of the adjusting unit. The adjustment unit 33 is firmly fixed by the support 21 that slides in the support 22 and the threaded portion 25.

The welding device consists, for example, of a single head which rotates around a cathode for welding to 3 or 4 welding spots.
One embodiment of the welding apparatus has three coplanar welding heads distributed around the welding gun.

(Effects of the Invention) As described above, according to the present invention, it is possible to provide a new method that eliminates the disadvantage that the cathode is welded and bonded at the same time, and it is possible to provide an automated welding apparatus. is there.

[Brief description of drawings]

FIG. 1 is a sectional view showing a conventional welding apparatus, and FIG. 2 is a sectional view showing a welding apparatus according to the present invention. 10 ... Welding needle, 13 ... Cathode unit, 14 ... Rod, 15 ... Vacuum container, 17 ... Shaft, 22 ... Support, 23 ... Spiral spring, 23a ... Shoulder, 25 ... Threaded part, 27 ... Chamber, 28 ... Shaft, 29 ... Piston, 30,31 ... Electric compressor.

Claims (8)

[Claims] 1. A cathode welding apparatus for an electron gun, wherein the cathode consists of a rod, especially in a vacuum vessel, the heads of which are of the type in which the welding is carried out by the use of pressure which holds the members together, in which case each welding head is For welding in series with a first driving device for supplying a pressure for connecting the welding needle to the vacuum vessel, the welding needle being located laterally to the vacuum vessel and mounted in the support body A cathode welding device for an electron gun, comprising a second drive device for supplying the pressure of 1. 2. The first drive device is an air-acting type device which is operated by a piston mounted coaxially with a shaft for movement of a welding needle by the piston receiving pressure from a compression device. The cathode welding device for an electron gun according to claim 1, wherein 3. The shaft according to claim 2, wherein the shaft is attached to one end of a welding needle on a side opposite to a side where welding is performed by a unit for adjusting a pressure for coupling. Cathode welding equipment for electron guns. 4. The cathode welding device for an electron gun according to claim 3, wherein the adjusting unit comprises a caging including two threaded portions that engage with the shaft and the support. 5. The adjusting device according to claim 4, wherein the adjusting device has a member for adjusting the relative movement of the shaft and the support body, and is rotated by an external device. Item 7. A cathode welding apparatus for an electron gun according to item. 6. The second driving device comprises an elastic member in the support body between the shoulder of the pillar of the welding needle and the member fixed to the support body. Item 1. The cathode welding apparatus for an electron gun according to item 1. 7. The cathode welding device for an electron gun according to claim 6, wherein the elastic member is a spiral spring. 8. The method according to claim 4, wherein the member fixed to the support is made of a casing made of a unit for adjusting the pressure for connecting. Cathode welding equipment for electron guns.