JPH04294028A - Frame welding device for cathode ray tube - Google Patents

Abstract

PURPOSE:To prevent a frame welding device for cathode ray tube from exfoliation of a frame blacking film likely at the time of the frane insertion. CONSTITUTION:A frame holder 20 is the structure to be advanced and retracted by a cylinder 21. When the frame 1 is to be inserted, this holder 20 is retreated to facilitate frame insertion and also to prevent exfoliation of the frame blackening film. To locate the frame 1, the holder 20 is advanced, and the frame 1 is pressed to a locational block 15, and thereby frame insertion is made easily and its location made precisely.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame welding device for welding the frame and spring of a cathode ray tube, particularly a color picture tube.

0002

2. Description of the Related Art In a cathode ray tube, for example, a color picture tube, a shadow mask 10 having a large number of openings is held inside a panel 11, as shown in FIG. shadow mask 1
0, the frame 1 that holds it, and the spring 9 provided on the outer periphery of the frame 1 are each welded to form a shadow mask structure, and the stud pin 12 of the panel 11 is coated with a fluorescent film and aluminum vapor-deposited on the inner surface. The panel 11 and the shadow mask structure are assembled by fitting the spring 9 into the fitting hole 13 of the spring 9.

As shown in FIG. 5, the frame 1 and spring 9 are assembled by inserting the frame 1 into the positioning part 15 and fitting the spring 9 so that it is in the same position as the stud pin 12 of the panel. The fitting pin 19 of the pin operation cylinder is fitted into the fitting hole 13 for positioning. After the frame 1 and the spring 9 have been positioned, resistance welding is performed using a hydraulic cylinder 14 and a welding gun 17 to assemble the frame.

The conventional positioning of the frame 1 includes a positioning block 15 on the outside of the frame 1, as shown in FIG.
The inner side has a ball plunger 18, and by setting the distance between the positioning block 15 and the tip of the ball of the ball plunger 18 supported by the height adjustment pin 3 to be slightly narrower than the wall thickness of the frame 1, it is possible to The spring force of the ball plunger 18 holds the frame 1 in a preloaded state to prevent it from shifting during welding.

[0005]

[Problems to be Solved by the Invention] This conventional positioning method requires a certain amount of force when inserting or removing the frame, and if the frame is not inserted or removed vertically, the frame will get caught, impairing work efficiency. was.

[0006] Furthermore, since the frame is constantly in contact with the positioning block and ball plunger during insertion and removal, the blackened film on the frame is rubbed off, and furthermore, it is necessary to attach a handling device to automatically feed the frame. In some cases, traditional positioning methods
Since the gap between the positioning block and the ball plunger is small, a high-precision handling device is required, resulting in a high price.

An object of the present invention is to provide a cathode ray tube frame welding device that solves the above problems.

[0008]

[Means for Solving the Problem] In order to achieve the above object, a cathode ray tube frame welding device according to the present invention includes a positioning block and a frame holder, and welds the cathode ray tube frame and spring together. A frame welding device for a cathode ray tube, in which a plurality of positioning blocks are arranged on the outer circumferential side of the frame, and a frame presser is provided so as to be movable forward and backward in opposition to each positioning block, and the frame presser is provided so as to be able to move forward and backward in opposition to each positioning block. The frame is positioned by applying it to the positioning block.

[0009]

[Operation] As shown in FIGS. 2(a) and 2(b), the frame presser 20 has a structure that allows it to move forward and backward by a cylinder 21,
When inserting the frame 1, the frame presser 20 is moved backward to insert the frame.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

(Embodiment 1) FIG. 1 is a plan view showing Embodiment 1 of the present invention. As shown in the figure, in the frame positioning section, positioning blocks 15 are arranged at three locations, two on the long side of the outer periphery of the frame 1 and one on the short side, as in the conventional case.

In the present invention, a frame presser 2 is installed from the outside of the frame 1 opposite to the positioning block 15.
Install 0 in 3 places. This frame presser 20 can be moved back and forth by a cylinder 21.

First, as shown in FIG. 2(a), the frame 1 is inserted with the frame presser 20 retracted by the cylinder 21, and is supported by the height adjustment pin 3. At this time, there is no problem even if there is a gap between the frame 1 and the positioning block 15.

Next, as shown in FIG. 2(b), the cylinder 21 is moved forward, and the frame 1 is pressed against the positioning block 15 by the frame presser 20 to position it. The frame presser 20 is moved forward until welding is completed.
Keep frame 1.

After welding is completed, the frame holder 20 is moved back by the cylinder 21, and the frame 1 is taken out with the positioning of the frame 1 released. By doing this,
The frame can be easily inserted and removed without damaging the blackening film.

(Embodiment 2) FIG. 3 is a side view showing Embodiment 2 of the present invention. In the figure, the positioning device according to the present invention exhibits a great effect when it is equipped with the above-mentioned frame handling device and performs automatic feeding. In other words,
As shown in FIG. 3, the handling unit has a frame clamper 7 that can be moved forward and backward by a clamp cylinder 6 and a slide unit 8, and the frame clamper 7 is advanced to press the inside of each corner of the frame 1 against the frame 1. Frame 1 is handled by Further, the structure is such that the handling unit can be moved to the supply section of the frame 1 or the storage section after welding is completed by means of the lifting shaft 5 and a slide mechanism (not shown). next,
To explain the method of supplying the frame 1 to the positioning mechanism section according to the present invention using the above-mentioned handling unit, the frame 1 handled from the frame supply section is moved by a slide mechanism (not shown) with the handling unit raised by the lifting shaft 5. Move it directly above the positioning section. Next, with the frame presser 20 retracted, the frame 1 is lowered to the positioning block 15 by the lifting shaft 5,
The frame clamper 7 is released and the frame 1 is lowered to the positioning section. By retracting the frame presser 20, there is sufficient room for lowering the frame 1 on both the long and short sides, and the handling unit does not require high precision. After that, the handling unit is raised and evacuated by the lifting shaft 5, and then the frame presser 2
By advancing the frame 1, the frame 1 is reliably positioned.

[0017]

As described above, according to the present invention, when inserting or removing a frame, the frame is released by releasing the frame presser, thereby facilitating insertion and removal. Further, even in a welding machine equipped with an automatic frame feeding device, the structure of the automatic feeding device can be simplified and the device can be made inexpensive.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view showing the positioning block and frame presser shown in FIG. 1;

FIG. 3 is a side view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a panel and shadow mask structure of a color cathode ray tube.

FIG. 5 is a plan view showing a conventional frame welding device.

FIG. 6 is a side view showing a method of positioning the frame in FIG. 5;

[Explanation of symbols]

15 Positioning block 20 Frame presser 21 Cylinder

Claims (1)

[Claims] 1. A frame welding device for a cathode ray tube, which has a positioning block and a frame holder, and welds a frame and a spring of a cathode ray tube, wherein the positioning blocks are arranged in plurality on the outer peripheral side of the frame. A frame welding device for a cathode ray tube, characterized in that a frame presser is provided so as to be movable forward and backward in opposition to each positioning block, and the frame is positioned by applying the frame to the positioning blocks.