JPS6217819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding apparatus for a shadow mask for a color cathode ray tube, and more particularly to a shadow mask welding apparatus suitable for a shadow mask having a shape in which the mask is welded to the inside of a frame.

The shadow mask consists of a mask having slits for color selection, a rigid frame that supports the mask, and a spring that engages the panel. There are two types of shadow masks with such a configuration: one in which the mask 1 is fixed to the inside of the frame 2 as shown in FIGS. 1 and 2, and one in which the mask 1 is fixed to the outside of the frame 2 as shown in FIG. There is.

Now, in order to weld and fix the mask 1 and the frame 2, it is necessary to weld the mask 1 to the frame 2 by applying pressure to the frame 2 using an electrode of a welding head. Therefore, when fixing the mask 1 to the outside of the frame 2, as shown in FIG. can be done. However, as shown in FIGS. 1 and 2, the mask 1
When fixing the mask 1 inside the frame 2, the welding electrode must be placed inside the mask 1. For this reason, as described below, in the conventional welding apparatus, it was necessary to make complicated movements of the welding electrode in order to supply the mask 1 and frame 2 to the apparatus and to discharge the welded shadow mask.

A conventional shadow mask welding device includes a mask positioning jig that is recessed in the upper surface so as to match the outer curved surface of the mask, a frame positioning jig that is disposed on the outside of this mask positioning jig, and a frame positioning jig that is arranged on the outside of the mask positioning jig. It consists of a welding head with an electrode arranged above. Since the electrode is placed above the mask positioning jig in this way, it is necessary to feed the mask and frame to the mask positioning jig and frame positioning jig, respectively, and to eject the welded shadow mask from the jig. In order to do this, it is necessary to move the electrode a sufficient distance above the mask positioning jig.
As described above, since the electrode needs to be moved vertically in addition to horizontally for welding, the device has the disadvantage of becoming complicated in structure and large in size.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a shadow mask welding device that has a simple structure and can be miniaturized.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 4 is a plan view showing an embodiment of the shadow mask welding apparatus according to the present invention. As shown in the figure, this device includes a mask positioning jig 10 for positioning a mask 1, a welding head 20 arranged around the mask positioning jig 10 in a number equivalent to the number of welding points, and a spring 3 attached to a frame 2. It consists of three frame positioning pin units 30 that engage and position the frame, a frame support 40 that moves up and down by receiving the four corners of the frame 2, and a guide rod 50 that roughly guides the outer periphery of the frame.

As shown in FIG. 5, the mask positioning jig 10 has a curved surface 11 whose upper surface protrudes to match the inner curved surface of the mask 1, and the side surface corresponding to the welding head 20 is cut out toward the lower surface to form a groove 12. is formed. Of course, the groove 12 may be formed to penetrate the curved surface 11, or the entire side surface may be formed to have a diameter corresponding to the inner surface of the groove 12. However, as in the illustrated embodiment, it is preferable that the curved surface 11 is not cut out so that there are many positioning surfaces for the mask 1.

As shown in the figure, the welding head 20 is connected to the mask 1.
Mask positioning jig 10 so as to face the inner surface of
The jig has an electrode 21 disposed in the groove 12, and the electrode 21 can be moved in the horizontal direction by an air cylinder 23 supported by a jig body 22 and guided by a rod 24.

As shown in FIG. 6, the frame positioning pin unit 30 has a tapered pin 31 that engages with a hole in a spring 3 attached to the frame 2.
This pin 31 is fixed to one end of a rod 33 which is slidably attached to the unit body 32.
The rod 33 can be moved horizontally by an air cylinder 34 supported by the unit body 32.
Its forward position is limited by a stopper 35 fixed to the rear end of the rod 33.

The frame support 40 is as shown in FIG.
It has a frame receiver 41 for receiving the lower surface of the frame 2, and the frame receiver 41 can move up and down within a bush 43 screwed into a support body 42. The frame receiver 41 is urged upward by a spring 44 built into the support body 42, and is designed to absorb the weight of the frame 2 by the spring 44. Further, the support body 42 can be moved up and down by an air cylinder 45.

As shown in the figure, the guide rod 50 is arranged so as to maintain a predetermined gap from the outer periphery of the frame 2, and is eccentrically attached to the support column 51 so that this gap can be adjusted.

Next, the operation of this device having such a configuration will be explained with reference to FIGS. 8 and 9. First, the mask 1 is placed inside the frame 2 where the spring 3 was attached in the previous process.
are incorporated and provided on the frame support 40. At this time, as shown in FIG. 8, the frame support 40 is in a raised position by the air cylinder 45, and when the frame 2 combined with the mask 1 is placed, the frame support 40 is lowered to a predetermined position. As the frame support 40 descends, the outer periphery of the frame is guided by the guide rod 50.
The deviation in the rotational direction of the frame 2 is almost corrected.
On the other hand, the mask 1 is received and held by the curved surface 11 of the mask positioning jig 10 while the frame support 40 is being lowered. Outer diameter of mask 1 and frame 2
Since there is a slight clearance between the inner diameters of the frame 2, the frame 2 descends to a predetermined position even after the mask 1 is held.

Subsequently, the pin 31 of the frame positioning pin unit 30 is advanced by the air cylinder 33 and engages with the hole in the spring 3. At this time, the frame 2 is supported in a floating state by the action of the spring 44 of the frame support 40, so that the frame 2 is positioned with respect to the pin 31 without any excessive force being applied to the frame 2. This state is shown in FIG.

As described above, the mask 1 and the frame 2 are automatically positioned, but if the mask 1 is only supported by the curved surface 11, it is likely to shift due to pressure applied during welding, etc., and the assembly accuracy will become unstable. In this example, a pad 60 with a cushion material pasted on a curved surface that substantially matches the outer curved surface of the mask is provided from above to stabilize the assembly accuracy. As another method, the same effect can be obtained by providing a hole in the mask positioning jig 10 and applying suction using a vacuum pump to bring the mask 1 into close contact with the curved surface 11.

After the frame 2 and mask 1 are positioned in this manner, the welding head 20 is operated. The electrode 21 of the welding head 20 is connected to the frame 2 and the mask 1.
At the time of supply, the mask 1 is retracted into the groove 12 as shown in FIG. Weld to frame 2. After welding is completed, the electrode 21 returns to its original position. Thereafter, the air cylinder 34 is actuated to move the pin 31 back and open the frame 2. Subsequently, the frame support 40 is raised to offset the shadow mask after welding is completed.

The frame support 40 and the guide rod 50 can be used not only for the type of shadow mask shown in FIGS. 1 and 2, but also for the welding apparatus for the type of shadow mask shown in FIG. 3.

As is clear from the above description, according to the shadow mask welding device of the present invention, the electrode of the welding head only needs to be moved horizontally, and supplying the mask and frame and discharging the welded shadow mask are very easy. , it is possible to obtain a device that has a simple structure, can be miniaturized, and has excellent work efficiency.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a shadow mask with the mask fixed inside the frame, Figure 2 is a partial sectional view of Figure 1, Figure 3 is a partial sectional view of the shadow mask with the mask fixed outside the frame, and Figure 4. 5 is a plan view showing an embodiment of the shadow mask welding device according to the present invention, FIG. 5 is a front view showing a partial cross section of the mask positioning jig and the welding head, FIG. 6 is a plan view of the frame positioning pin unit, and FIG. The drawing is a front view showing a partial cross section of the frame support and the frame guide, and FIGS. 8 and 9 are sectional views for explaining the operation of the present invention. 1...Mask, 2...Frame, 3...Spring, 10...Mask positioning jig, 11...Curved surface, 12...Groove, 20...Welding head, 21...
Electrode, 30...Frame positioning pin unit,
31...Pin, 40...Frame support, 41
...Frame holder, 44...Spring, 50...Guide rod.

Claims (1)

[Claims] 1. A mask positioning jig whose upper surface protrudes to position the mask so as to almost match the inner curved surface of the mask, and a spring hole located outside of this mask positioning jig and corresponding to the spring hole attached to the frame. A frame positioning pin unit having a pin that is inserted and engaged in a hole to position the frame, a guide rod that guides the outer periphery of the frame to facilitate positioning of the frame based on the pin of the frame positioning pin unit, and a spring that absorbs the weight of the frame. A shadow mask welding device consisting of a powerful frame support and a welding head that is disposed inside a mask that is closely positioned on a mask positioning jig and that presses and welds the mask from the inside to a frame that is positioned on a frame positioning pin unit. .