JPH034427A - Application device for frit glass - Google Patents

Abstract

PURPOSE:To facilitate the frit glass application in the center of a frit seal surface by using a variable sequence robot. CONSTITUTION:There are provided a support member 41 for contacting four points on the outer circumference of a funnel 4, a mechanism for positioning the funnel 4 with a neck chuck 4 supporting a funnel neck portion 5, and a variable sequence robot 36 for moving an application nozzle 47. According to the movement of the variable sequence robot 36, the application nozzle 47 is moved just above a frit seal surface 4a. This enables frit glass 10 to be applied easily in the center of the frit seal surface 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a frit glass coating apparatus for applying frit glass to the frit seal surface of a funnel in the manufacturing process of cathode ray tubes, particularly color cathode ray tubes.

[Prior Art] Generally, color cathode ray tubes have a funnel 4 as a means for sealing the panel 2 and the funnel 4, as shown in FIG.
Frit glass IO is applied to the frit seal surface. In addition, in the figure, l is a fluorescent film, 3 is a shadow mask, and 5 is a fluorescent film.
is a neck, 6 is a stem, 7 is an electron gun structure, and 15 is an anode.

Conventionally, this type of frit glass coating apparatus was disclosed in Japanese Patent Application Publication No. 57
209669, and the conventional device is as shown in FIG.
The funnel 4 is supported on the rotary table 13 in an upward position, and the funnel 4 is rotated around the rotation axis X by the servo motor 16 of the drive device 15 via the gears 17 and 18, and the rotation angle is measured by the rotary encoder 20. Also, the sealing surface 4a
is constantly detected by the photo array camera 22.

The nozzle 24 of the frit tank 25 is arranged at a position facing, for example, 180 degrees from the set position of the photo array camera 22 with the rotation axis A command is issued from the winding calculation processing device 32, and the servo motor 30 of the nozzle position adjustment device 27 and the ball screw 2
8 to keep the nozzle 24 on the frit seal surface 4.
The frit glass was applied so as to be located at the center of the width direction of the glass.

FIG. 5 shows the funnel at the stage where frit glass has been applied, and the funnel part conductive film graphite 9 and the neck part conductive film graphite 8 are applied to the inner peripheral surfaces of the funnel 4 and the neck 5, respectively.

[Problem to be solved by the invention]

The conventional frit glass coating apparatus described above has the following problems. In other words, (1) the method of controlling the position of the nozzle 24 while constantly inputting data from the photo array camera 22 requires adjusting the position of the nozzle 24 each time while performing the calculation process. It is not possible to rotate quickly and it takes time to apply.

(2) The frit glass discharged from the nozzle 24 is delayed in reaching the frit sealing surface 4a with respect to the movement of the nozzle 24 due to its viscosity. For this reason, in a part of the funnel corner where the direction of the moving force of the nozzle 24 suddenly changes, the frit is coated on the inside of the brit seal surface 4a and hangs down from the frit seal surface, making it impossible to secure the required amount of frit.

(3) The frit glass must be applied uniformly over the entire circumference of the frit seal surface 4a, and there must be no uncoated portion on the frit seal surface 4a.

In the frit glass coating device, in particular, the coating start position and the coating end position coincide, and there is no uncoated area in these areas, and the coated areas overlap so much that excess bullet glass drips inside and outside of the frit seal surface 4a. The coating must be done in such a way that it does not get wet. however,
The frit glass is supplied from the usually sealed frit tank 25 to the nozzle 24 by air pressure, and by opening the on-off valve provided inside the nozzle 24.
Discharge takes place. For this reason, air pressure continues to be applied while the on-off valve is closed, and the air pressure increases somewhat, and when the on-off valve is opened at the coating start position, the frit glass is vigorously discharged. As a result, the coating start position is generally in another area; there are many ridges of frit glass, and since the frit glass is further overlapped upon this when coating is finished, it tends to drip in and out of the frit seal surface. In addition, since frit glass has the property of drying and solidifying very easily, if the on-off valve is closed for a long time after coating is finished, the frit glass at the tip of the nozzle 24 will dry, and then the on-off valve will be opened. When this occurs, a phenomenon occurs in which the beginning of the frit glass is delayed. Therefore, for example, if the on-off valve is controlled so that it opens at a certain point on the frit seal surface and closes at a certain point, variations in the arrival of the funnel to the application body 5 will cause variations in the time the on-off valve is closed. This affects the drying state of the frit glass at the tip of the nozzle, resulting in variations in the coating start position and problems in that the coating does not connect well with the coating end position.

An object of the present invention is to provide a frit glass coating device that solves the above problems.

[Differences between the invention and the prior art] In contrast to the conventional frit glass coating apparatus described above, the present invention uses a variable sequence robot in the coating apparatus main body, and is equipped with a frit glass detection mechanism on the frit seal surface. Another difference is that the operating speed of the on-off valve that controls the start and end of coating the frit glass can be independently varied.

[Means to solve the problem]

In order to achieve the above object, a frit glass coating apparatus according to the present invention applies frit glass to a frit seal surface while relatively moving a funnel and a coating nozzle. It has a mechanism for positioning the funnel using a support member that comes into contact with the neck chuck and a neck chuck that supports the funnel neck, and a variable sequence robot that moves the coating nozzle. The frit glass is applied by moving the glass directly above the glass. Further, the frit glass coating device according to the present invention has a detection mechanism for detecting the frit glass coated on the frit seal surface, and the coating end position is determined by detecting the coating start position of the frit glass by the detection mechanism. It is something to control. Further, in the frit glass coating apparatus according to the present invention, the operating speed at the time of opening and closing of the opening/closing valve for controlling the start and end of coating of frit glass provided inside the coating nozzle is independently variable.

〔Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a front view showing a frit glass coating apparatus according to the present invention.

In this embodiment, a dispenser 37 is fixed to the tip of the Z-axis 35 of a Cartesian coordinate robot 36 (hereinafter abbreviated as robot) having an X-axis 33, a Y-axis 34, and a Z-axis 35 as a variable sequence robot. A photoelectric sensor 39 for detecting the frit glass IO coated on the frit seal surface 4a of the funnel 4 is arranged in the front (direction of movement).

Further, when the funnel 4 is carried to the frit glass application position by the pallet 40, the four funnel support parts 41 that have been waiting are raised by the cylinder 42, come into contact with the funnel 4, and lift the funnel 4.

By this lifting action, the rotational direction of the funnel 4 about the tube axis is corrected, and then the neck 5 is held down by the neck chuck 43, and in conjunction with the positioning of the funnel support part 41, the rotational direction of the funnel 4 is adjusted. Positioning in the rotational direction around the tube axis is completed.

To position the funnel 4 in the rotational direction around the tube axis, there is a method of supporting and positioning three alignment points on the outer circumference of the funnel.In this method, the dimensions of the alignment points depend on the size of the funnel 4. Because they are different, a problem arises in that it is difficult to share them in cases such as automated lines that produce a wide variety of products.

In the method of supporting the outer periphery of the funnel of the present invention, the funnel support portion 41 is brought into contact with a portion of the outer periphery of the funnel that has a generally rectangular cross-sectional shape, so that it can be used in several sizes.

In the case of this embodiment, if the distance between the four outer peripheral support parts is set to be approximately 180 mm on the long side of the funnel 4 and approximately 120 mm on the short side of the funnel 4, it is possible to share the width from 10 inches to 16 inches. It has become.

Next, the coating operation by the robot 36 will be explained in detail.

When the positioning of the funnel 4 is completed, the operation of the robot 36 starts based on the teaching data input to the robot 36 in advance. First, the dispenser 37 fixed to the Z axis 35 of the robot 36 moves from the standby position to near the coating start position 44 on the frit seal surface 4a.

Thereafter, while moving on the sealing surface 4a, the on-off valve 45 is opened to discharge the frit glass 10. The frit glass 10 is attached to a tube 46 from a frit tank (not shown).
The water is supplied to the dispenser 37 via. The movement locus of the dispenser 37 will be explained with reference to FIG. 2. The long side 47 and the short side 52 have a small curvature and have a curved shape close to a straight line. By moving the frit glass IO, it is possible to apply the frit glass IO to the center of the frit seal surface. At this time, the interpolation function (linear interpolation, circular interpolation, etc.) of the robot 36 can be used by teaching the start point, end point, and points near the middle of each side and moving by circular interpolation, or by specifying teaching points in detail by linear interpolation. You may also move it.

Next, in a part of the corner, the curvature of the center of the frit seal surface 4a is about R20 to R30 (depending on the product), and as described above, the dispenser 37 is attached to the frit seal surface 4a.
If you move it along the center of a, the frit glass IO
Since it is applied inward, the movement locus 48 of the dispenser 37 is taught by circular interpolation so that it moves outward of the sealing surface 4a in anticipation of inward penetration.

The extent to which this movement locus 48 is shifted outward is determined by the distance from the frit seal surface 4a to the nozzle 47 and the distance from the frit glass 10.
Since it is affected by various conditions such as the viscosity of the coating material, it is difficult to determine it through theoretical calculations, but by using a robot, it is possible to make detailed corrections through teaching while actually applying the coating. This makes it easy to find the optimal position. 50 is the starting trajectory, 5
1 is the locus at the end.

In FIG. 1, when the dispenser 37 moves around the frit seal surface 4a to near the coating start position 44, the photoelectric sensor 39 searches for the coating start position.

The photoelectric sensor 39 is fixed in the direction in which the frit seal surface 4a moves in advance of the dispenser 37 at a distance of, for example, about 20 degrees from the dispenser 37 on one side where the coating start position is located. Therefore, when the photoelectric sensor 39 detects the coating start position 44, the dispenser 37
is located at a distance of 2011111 points before the coating start position. The distance between the photoelectric sensor 39 and the dispenser 37 is determined by an electrical and mechanical delay between when the photoelectric sensor 39 detects the coating start position 44 and when the on-off valve 45 closes. It is determined by the distance at which the frit glass IO is applied. Therefore, it is desirable that the photoelectric sensor 39 be fixed with a mechanism that can be finely adjusted in the direction of movement of the dispenser 37.

As described above, the coating start position 44 is detected by the photoelectric sensor 39, and based on this signal, the on-off valve 45 is closed, and the discharge of the frit glass 10 is stopped. Since the dispenser 37 is still moving during this time, the distance M between the photoelectric sensor 39 and the dispenser 37 is adjusted so that the dispensing stops at the coating start position 44 where the frit glass 10 is just formed. By using the photoelectric sensor 39, even if the coating start position M44 varies, the opening/closing valve 45 is always closed at a certain distance from the coating start position, making stable coating possible. Become.

Furthermore, the present invention has the following mechanism in order to stabilize the overlapping condition of the frit glasses at the coating start position.

As mentioned above, when the on-off valve 45 opens, the amount of applied frit glass IO increases by increasing the pressure inside the dispenser 37, and when the on-off valve 45 closes, the on-off valve 45 increases the amount of frit glass IO applied. Extrusion increases the amount of coating. Therefore, in the embodiment according to the present invention, the on-off valve 45 is driven by a double-acting cylinder 49 as shown in FIG.
a and 49b are installed so that the operating speed of the on-off valve when opening and closing can be adjusted independently. By doing this, for example, when opening the on-off valve 45, the speed controller 49a is throttled down and the operating speed is slowed down, so that the cross-sectional area of the flow path of the frit glass gradually increases until the on-off valve 45 is fully opened. , it becomes possible to apply an appropriate amount of frit glass by exactly counteracting the phenomenon that the amount of applied glass increases due to the increase in pressure. Similarly, when closing the on-off valve 45, by restricting the speed controller 49b and slowing down the operating speed of the on-off valve 45, it is possible to gradually push out the frit glass 10 and locally increase the amount of application. Preventing.

Further, in addition to the mechanism for adjusting the operating speed of the on-off valve as described above, more detailed control is also possible by varying the moving speed of the dispenser by teaching the robot.

In this embodiment, the frit glass is supplied from a frit tank (not shown) to the dispenser 37 through the tube 46, but the frit tongue is fixed to the robot and the nozzle 47 is provided at the bottom of the frit tongue. The present invention is also effective when coating is performed with an on-off valve provided inside the frit tank.

〔Effect of the invention〕

As explained above, in the present invention, by using a variable sequence robot, it is possible to easily apply frit glass to the center of the frit seal surface. Also,
By supporting the outer periphery of the funnel, the funnel positioning mechanism allows funnels of several sizes to be used in common without changing the distances between the four outer periphery support parts. Further, by providing a frit detection sensor and a mechanism for adjusting the operating speed of the on-off valve, there is an effect that the joining portion of the frit glass at the application start position and the application end position can be coated stably.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the frit glass coating device of the present invention, FIG. 2 is a plan view showing the movement locus of the dispenser, FIG. 3 is a partial cross-sectional view showing the structure of the dispenser according to the present invention, and FIG. FIG. 5 is a vertical cross-sectional view showing the structure of a cathode ray tube, FIG. 5 is a vertical cross-sectional view showing the form of the funnel at a stage where frit glass is applied, and FIG. 6 is a perspective view showing a conventional frit glass application apparatus. 4... Funnel 4a... Frit seal surface 10... Frit glass 36... Orthogonal coordinate robot (variable sequence robot) 37... Dispenser 39... Photoelectric sensor 4
1...Funnel support part

Claims (3)

[Claims] (1) In a frit glass application device that applies frit glass to the frit seal surface while moving the funnel and application nozzle relatively, a support member that contacts four points on the outer circumference of the funnel and a neck that supports the funnel neck part are used. It has a mechanism that positions the funnel with a chuck and a variable sequence robot that moves a coating nozzle.The coating nozzle is moved directly above the frit seal surface in accordance with the operation of the variable sequence robot, thereby coating the frit glass. A frit glass coating device characterized by: (2) A detection mechanism for detecting frit glass coated on a frit seal surface, and a coating end position is controlled by detecting a coating start position of the frit glass by the detection mechanism. The frit glass coating device according to item (1). (3) The operating speed of the opening/closing valve of the opening/closing valve provided inside the coating nozzle for controlling the start and end of coating the frit glass is independently variable.
) and (2) above.