JPS6318829B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube sealing machine used in the process of inserting and sealing an electron gun into a cathode ray tube.

One of the manufacturing steps for color cathode ray tubes is the step of inserting and sealing an electron gun inside the cathode ray tube.
In this case, the relative insertion angle between the cathode ray tube and the reference pin of the stem of the electron gun differs depending on the product type.
However, conventional sealing machines for cathode ray tubes are equipped with a stand that holds the cathode ray tube and a head that holds the electron gun and has a mount pin that moves up and down, and it is difficult to replace the entire head when changing types. head replacement and adjustment requires a considerable amount of time, e.g. 2 to 3 hours. For this reason, conventional equipment is unsuitable for low-volume, high-mix production.
Since it was used exclusively as a special-purpose machine, it had the drawbacks of extremely low operating rates and the need for a large number of equipment.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a sealing machine for cathode ray tubes, which is suitable for small-lot production of a wide variety of products and can perform head adjustment in a short time when changing products.

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

FIG. 1 shows a cathode ray tube 1 and an electron gun 2, a is an explanatory diagram before the sealing process, b is an explanatory diagram after the sealing process,
FIG. 2 is a cross-sectional view showing an embodiment of the cathode ray tube sealing machine according to the present invention. A stand 10 for positioning and holding the cathode ray tube 1 has a U-shape, and has a plurality of reference blocks 11 (usually three) for positioning the cathode ray tube 1 upwardly, which can be adjusted in the front and back positions, and a valve holder on the inside that receives the weight of the cathode ray tube. stand 12
is removably fixed thereto, and a gear 13 having a hole in the center is further fixed at the lower end. This gear 13 is rotatably supported by a bearing portion 14a of a support plate 14 provided with a hole through which the neck portion 1a of the valve 1 is inserted. The support plate 14 is fixed to the upper end of a column 16 fixed on a table 15.

Further, a cylinder 17 is rotatably supported on the table 15 concentrically below the pedestal 10, and a mount shaft 18 is disposed within the cylinder 17 to rotate together with the cylinder 17 and to be movable up and down with respect to the cylinder 17. It is set up. A mount pin 19 for holding the electron gun 2 is attached to the upper end of the mount shaft 18, and the mount shaft 18 is moved up and down by a vertical movement drive mechanism (not shown). Also tube 17
is fixed to a gear 21 having the same size as gear 13 via a clutch 20. The gears 13, 21 rotate in synchronization with the gear 13.
21 mesh with drive gears 22 and 23 having the same diameter, respectively, and these drive gears 22 and 23 are integrally fixed by a connecting shaft 24 rotatably supported by the column 16. Although not shown, a pulley that is rotated by a motor or the like via a belt is fixed to the connecting shaft 24. Also tube 17
A collar 25 is fixed to the upper end, and on the outer periphery of this collar 25, as shown in FIG.
A plurality of scale plates 26 for positioning are fixed for each of B, C, and D, and the scale plates 26 are fixed to the table 15.
A reference scale plate 27 is fixed to the reference scale plate 27.

Next, the operation of the sealing machine having such a configuration will be explained. When the cathode ray tube 1 is fed into the frame 10 with the clutch 20 in the closed state, the cathode ray tube 1 is positioned by the reference block 11 and supported by the valve holder 12. On the other hand, the electron gun 2 is supplied onto the mount pin 19 and held in position. Next, the mount shaft 18 is raised by means not shown, and the electron gun 2 is inserted into the neck portion 1a of the cathode ray tube 1. In this way, the electron gun 2 is inserted into the cathode ray tube 1 at a predetermined mounting position angle.

Next, in this state, proceed to the sealing process. The connecting shaft 24 is rotated by a drive means (not shown). As a result, the pedestal 10, that is, the cathode ray tube 1, is rotated by the drive gear 22 via the gear 13. In addition, the drive gear 23 connects the mount shaft 18 via the gear 21, the clutch 20, and the cylinder 17.
That is, the electron gun 2 rotates. In this case, since the drive gears 22 and 23 have the same diameter and the gears 13 and 21 have the same diameter, the cathode ray tube 1 and the electron gun 2 rotate in synchronization, that is, while maintaining a certain fixed mounting position angle. Therefore, by heating the lower end of the network tube 1a with a burner during this rotation, the electron gun 2 can be sealed to the cathode ray tube 1.

Now, when switching to a model in which the insertion relative position angle between the cathode ray tube 1 and the reference pin of the stem of the electron gun 2 is different, by opening the clutch 20, the cylinder 17 is placed in a free rotation state with respect to the gear 21, that is, the frame 10. Become. Then, by rotating the cylinder 17 and aligning the switching type scale on the scale plate 26 attached to the collar 25 fixed to the cylinder 17 with the reference scale plate 27 on the table 15, and closing the clutch 20, the mount pin 19 is adjusted. The position can be changed freely and easily. Further, switching to another type of cathode ray tube 1 having a different overall length of the neck portion 1a is performed by replacing the bulb holder 12.

In the above embodiment, the pedestal 10, the mount pin 19, and the gear 1 are used as an example of a synchronous rotation mechanism.
Although the methods according to No. 3, 21, 22, and 23 have been shown, the structure is not particularly limited.

As is clear from the above description, the cathode ray tube sealing machine according to the present invention can freely rotate the mount pin with respect to the mount and hold it in that position, and can rotate the mount pin and the mount pin synchronously. It is possible to quickly switch to a model with a different insertion relative position between the cathode ray tube and the reference pin of the electron gun stem, which improves the equipment operating rate.
Suitable for low-volume, high-mix production.

[Brief explanation of the drawing]

Figure 1 shows a cathode ray tube and an electron gun, a is an explanatory diagram before the sealing process, b is an explanatory diagram after the sealing process, and the second
The figure is a sectional view showing one embodiment of the cathode ray tube sealing machine according to the present invention, and FIG. 3 shows a collar part, a is a plan view, and b is a front view. 1... Braun tube, 2... Electron gun, 10... Mount, 13... Gear, 17... Tube, 18... Mount shaft, 19... Mount pin, 20... Clutch, 21... Gear, 22, 23... Drive gear, 24... Connection shaft.

Claims (1)

[Claims] 1 A seal for a cathode ray tube, which is equipped with a mount that positions and holds a cathode ray tube, and a mount pin that is disposed below the mount and moves up and down while positioning and holding an electron gun, and is used in the step of inserting and sealing an electron gun into the cathode ray tube. In the machine, the mount pin is provided with a rotation holding mechanism so that it can be rotated to any angular position with respect to the pedestal and held at that arbitrary angular position, and further provided with a synchronous rotation mechanism to synchronously rotate the mount pin and the pedestal. A sealing machine for cathode ray tubes.