JPS6047697B2 - Tension band tightening device for explosion-proof cathode ray tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for tightening a steel tension band while applying a constant tension to the outer periphery of the side wall of a cathode ray tube as an explosion-proof measure for the cathode ray tube.

In general, explosion-proof cathode ray tubes have a rim band, which is a metal reinforcing metal fitting, attached to the outer periphery of the side wall of the cathode ray tube 1 with a cushioning material such as adhesive tape, as shown in Figure 1, in order to prevent implosion accidents caused by external shocks. 2 is attached, and a steel tension band 3 with an appropriate tension is wound thereon, and both ends of the tension band 3 are caulked with seal fittings 4 to maintain an explosion-proof effect.

Conventionally, the above-mentioned tension band tightening work has been carried out by an operator manually positioning the CRT 1 and the rim band 2 using a device equipped with a supply chute for the tension band 3 according to the size of each CRT 1 and a positioning mechanism for the CRT 1. After that, the tension band 3 is again manually fed into the supply chute, and the tightening work of tightening the tension band 3 with a hand tool for tightening, fixing it with the seal fitting 4, and cutting the tension band 3 is performed. It was on.

According to this conventional work method, a device with a positioning mechanism for each size of cathode ray tube 1 and a hand tool for seaming and tightening are required, and one operator is required for each machine because it is manual work. It was hot. Furthermore, since hand tools are used, work efficiency is poor and a large amount of equipment is required, and it is difficult to maintain quality control, such as controlling residual tension in the tension band 3 after tightening. I was spending a lot of time. This invention has been made in view of the above points, and it provides a positioning mechanism that can be switched according to the size of each cathode ray tube, and at the same time allows different types of rim bands to be positioned using a common positioning mechanism. There is something that makes it possible to tighten the tension band.

This invention will be explained below. 2 and 3 are a plan view and a side view of a device showing one embodiment of the present invention, FIG. 4 is a partial sectional view of a rim band holding part, and FIG.
Figures 1 to 10 show working patterns according to the operating order of the apparatus of the present invention.

Now, the tension band 3 is pulled out from the dispenser 7 by the feed roller 6 of the automatic tightening head 5 shown in FIG. The tip of the tension band 3 is clamped to the clamp part 9 of 5.

In this state, the tension band 3 is heated uniformly to a certain set temperature by the plate heater 10 provided in the supply chute 8. The rim band 2 is supplied by an operator using the positioning pin 12 provided on the lug holder 11 as a guide, and the rim band 2 is held and fixed by the lug presser 13 with the air cylinder 14 as shown in FIG. In this state, the rim band 2 has not yet come into contact with the side wall of the cathode ray tube 1. The cathode ray tube 1 is supplied from the previous step onto a rubber suction pad 15 as shown in FIG. 3 by a conveyance means such as a transfer device. FIG. 5 shows the state up to this point. Next, when the set heating time of the tension band 3 has elapsed, the lug holder moving base 16 on which the rim band 2 is positioned is moved by the air ring 17 to a position where it comes into close contact with the side wall of the cathode ray tube 1 and then stopped.

This state is shown in FIG. Next, NO. l guide 18 is connected by air cylinder 20 and NO. 2 guide 19 is connected to the cathode ray tube 1 by an air cylinder (21 is not shown).
1 and position the cathode ray tube 1 from the left, right, and rear sides.

Next, the cathode ray tube 1 moves the inside of the suction pad 15 to a vacuum generator (
(not shown), the face 22 of the CRT 1 is suctioned, and the suction pad 15 is pulled down by the air cylinder 23, and the CRT 1 is placed in the valve receiver 24.
It is fixed by pulling it down to the position where it hits.

Next, the winding head moving section 25 is moved to near the side wall of the cathode ray tube 1 by the air cylinder 216 and then stopped.

This is shown in FIG. Next, the heated tension band 3 is wound around the side wall of the cathode ray tube 1 while the feed roller 6 of the automatic winding head 5 rotates in the opposite direction, and the tension band 3 is pulled back and pulled out from the supply chute 8. The tension band 3 is then tightened by the automatic winding head 5 until the set tension is reached, the tension band 3 is fixed by the seal fitting 4, and the tension band 3 is cut at the fixed end face.

This is shown in FIG. The mechanisms for sending out and pulling back the tension band 3, fixing it with the seal fitting 4, and cutting the tension band 3 are all provided in the automatic tightening head 5, and are operated by electrical control.

When the tightening operation is completed, all the parts return to their original positions, and the cathode ray tube 1 that has undergone the tightening operation is taken out by a conveyance means such as a transfer device. This is shown in Figure 10. Next, a method of positioning rim bands on different types of cathode ray tubes using a common positioning mechanism will be explained using this embodiment.

By the way, the conventional method of positioning the rim band is as follows:
As shown in FIG. 12, the lug holder 28 that fits the lug 27 welded to the rim band 2 is used for positioning, or as shown in FIG. 13, the square hole provided in the lug 27 is used for positioning. One possible method is to fit approximately S into the circular pin 29 installed at a fixed position on the lug holder 28, but these methods allow for the positioning of several types of rim bands that change the shape and positioning of the lug 27. This method is inappropriate.

Therefore, in this invention, as shown in FIG. 11, as a method for positioning the three types of rim bands, the side walls of the lugs 30, 31, 32 of the three types of rim bands of different sizes and shapes are brought into contact with the positioning pin 12, and the positioning is performed. pin 12
The position can be determined by moving a predetermined distance by a moving means such as an air cylinder.

That is, in FIG. 11, large, medium, and small lugs 30, 31,
32 is shown being guided by the positioning pin 12.

As shown in FIG. 5, the rim band 2 is split into two parts in a U-shape, and is attached to the outer periphery of the cathode ray tube 1 at a distance from each other. If it is large, it is necessary to attach it externally in advance. Therefore, the positioning pin 12 may be moved according to the size of the cathode ray tube 1, and the rim band 2 may be attached using this as a guide. That is,
In Fig. 11, the lugs 30 are for the small cathode ray tube 1, and although they are not shown, there is also a symmetrical positioning pin 12 on the right side, between which the lugs 30 of the rim band 2 shown in Fig. 5 fit. . In the case of the lugs 31, the distance between the left and right positioning pins 12 is further increased, and a large rim band 2 can be attached. Lugs 32 are for larger rim bands 2. Next, a method for positioning three types of cathode ray tubes of different sizes using the above method will be explained.

In FIG. 2 again, NO. The 1 guide 18, the NO guide, the 2 guide 19, the seaming head moving section 25, and the lug holder switching section 38 are each provided with a position regulating mechanism 37.
Figures 14, 15, and 16 show this position adjustment mechanism 37.
This explains the operating status of the . That is, the air cylinders 34 and 35 having the necessary amount of movement are connected to each other,
Fix the shaft end 36 of one air cylinder 34 and place it in the position shown in Figure 14 when both air cylinders 34 and 35 do not operate, or in the position shown in Figure 15 when the air cylinder 34 operates and the air cylinder 35 does not operate. , and further air cylinder 3
When both 4 and 35 are activated, three types of movement can be obtained by changing the operation of the air cylinder three times to the position shown in FIG. 16. This is done by operating the position regulating mechanism 37 in response to an electrical switching signal depending on the size of the cathode ray tube 1, and determining the necessary amount of movement. In addition, the valve receiver 24 (Fig. 3), which determines the tightening height of the tension band 3, rotates three types of valve receivers 24, 39, and 40 so that the height can be changed according to the three sizes of cathode ray tubes. cylinder 4
It has a structure that can be switched by 1.

That is, the valve receivers 24, 39, and 40 have different lengths, and as the rotary cylinder 41 rotates, one of them is in a position where it can support the tube surface of the cathode ray tube 1, and the other two are in a position where it can support the tube surface of the cathode ray tube 1. It will be in a position where it will not work. A rotary cylinder 41 like this is installed on the bottom surface of the cathode ray tube 1.
If more than one valve support is provided, when the air cylinder 23 is lowered and the suction pad 15 is pulled down, the peripheral side of the tube surface of the cathode ray tube 1 will be supported by one of the valve supports 24, 39, and 40. This makes it possible to change the positioning height of the cathode ray tube 1 and change the tightening height. In the above embodiment, a structure capable of tightening three types of cathode ray tubes was described, but this can of course be applied to two types or one type of dedicated machine, and it can also be applied to three or more types of dedicated machines. The positioning mechanism using two air cylinders can also be applied to positioning methods for other devices.

As explained above, according to the present invention, in a production line where several types of cathode ray tubes of different sizes are supplied together, it is possible to give electrical signals for each size of cathode ray tubes at the time of supplying the cathode ray tubes to the equipment. Therefore, the positioning preparation operation can be immediately performed according to the size of the tube, and therefore, the work of tightening the tension bands of cathode ray tubes of several different sizes can be performed with one device.

Furthermore, in place of hand tools, we are equipped with an automatic tightening head and tension band heating device, which greatly speeds up the tightening process, and at the same time allows high residual tension to be obtained in the tension band after tightening. Quality is greatly improved.

Furthermore, if this device is equipped with a cathode ray tube transfer device, the operator only has to do the work of supplying the rim band and the rest of the work is done automatically, so a great labor-saving effect can be expected.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an explosion-proof cathode ray tube, Figs. 2 and 3 are a plan view and a side view showing an embodiment of the present invention, and Fig. 4 is a perspective view of an explosion-proof cathode ray tube.
The figure is a partial sectional view of the rim band holding part, Figures 5 to 10 are operation diagrams when tightening the tension band using the device of the present invention, and Figure 11 is the principle explaining the rim band positioning method. 12 and 13 are plan views illustrating the conventional method of positioning the limber 7, and FIG.
Figures 1 to 16 are explanatory diagrams of the operation of the position regulating mechanism.

Claims (1)

[Claims] 1. A means for supporting cathode ray tubes of several different sizes so that they can move up and down in an inverted state; a means for supporting said cathode ray tubes with a plurality of valve holders of different lengths by rotating a predetermined valve holder; A cathode ray tube positioning mechanism for positioning movement and rotation by switching electrical signals; means for attaching a rim band to the cathode ray tube at a distance from the outer periphery of the cathode ray tube; a rim band positioning mechanism comprising means for moving the means and means for bringing the mounted rim band into close contact with the side wall of the cathode ray tube; an automatic tightening mechanism for automatically sending out and automatically tightening a tension band to be tightened around the cathode ray tube; A tension band tightening device for an explosion-proof cathode ray tube, comprising: a clamp section having a head; and a supply chute provided for clamping the tension band and having a heating device for heating the tension band.