JPH02237680A - Coating method - Google Patents

Abstract

PURPOSE:To stabilize coating work by impregnating a coating liq. into a coating means, regulating the amt. of the coating liq. in the coating means by squeezing under a prescribed pressure and coating a surface to be coated. CONSTITUTION:A sponge roller 9 as a coating means is held by a holder 11 fitted to the tip of a robot's hand and a coating liq. such as a graphite suspension is impregnated into the roller 9. A squeezing mechanism 10 produced by covering the upper opening of a case 10a with a lid 10b having many pierced through holes 10b1 is set near a storage vessel contg. the coating liq. The roller 9 is squeezed with the mechanism 10 before coating to regulate the amt. of the coating liq. in the roller 9 and coating is carried out. The roller 9 is squeezed by pressing against the surface of the lid 10b under a prescribed pressure and moving in the direction of an arrow A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating method particularly suitable for automatically coating an exterior conductive film on the funnel portion of a cathode ray tube bulb. [Prior art] When manufacturing cathode ray tubes, an internal conductive film of graphite is applied to the inner surface of the funnel portion of the bulb, or an outer conductive film of graphite is applied to the outer surface of the funnel portion of the bulb after the electron gun is enclosed. There is a process of forming a smoothing capacitor for the anode voltage with the internal conductive film. When applying the interior conductive film, the bulb is held in a jig, and the operator manually applies the film with a brush. Further, a specific example of an apparatus for applying an exterior conductive film is shown below with reference to FIG. In the figure, (1) is a cathode ray tube bulb (hereinafter simply referred to as a bulb), (2
) is the coating mask, (3) is the turntable, (4) is the spray nozzle, (5) is the anti-slip cover, and (6) is the exhaust duct. The above-mentioned bulb (1) is placed after the electron gun is enclosed and before the final inspection, and is mounted on the rotary table (3) with the panel side facing downward.

As shown in the plan view of FIG. 7, the coating mask (2) has an opening surface (2a) that is equal to the pattern of the exterior conductive film to be coated on the outer surface of the funnel portion (1a) of the bulb (1), and has a neck (lb) and other valve outer surfaces including the anode button (lc). The spray nozzle (4) sprays a suspension of water, binder, and graphite onto the outer surface of the funnel part (1a) through the coating mask (2) to apply an exterior conductive film of graphite. The dustproof cover (5) surrounds the bulb (1) placed on the rotary table (3) from above and below and from three sides, and a spray nozzle (4) is arranged on the opening side (5a).
Prevents scattering of graphite suspension during spraying. The exhaust duct (4) covers the upper part of the dustproof cover (5) and exhausts the scattered graphite suspension.

In the above configuration, the valve (1) is covered with the coating mask (2) and placed on the turntable (3), and while rotating the valve (1), the operator uses the spray nozzle (4) to spray the funnel part (1).
Spray and apply graphite suspension to a).

In addition to the above-mentioned exterior conductive film, the outer surface of the funnel part (1a) of the bulb (1) is coated with anode silicon (7 ) is applied after coating the exterior conductive film. In this case, as in the case of the exterior conductive film, with the bulb (1) placed on the rotating table (3), as shown in FIG. over the funnel part (1a) including the anode button (1c), and the operator applies a silicone solution diluted with xylene to the mask (8).
through the funnel part (la) at the spray nozzle (4).
) to apply anode silicon. [Problems to be Solved by the Invention] By the way, as mentioned above, when applying the interior and exterior conductive films and anode silicon to the bulb funnel portion, conventionally, this was done manually by an operator using a brush or a spray nozzle. However, in recent years, industrial robots have been used to automate the application work by attaching brushes or sponge rollers to the tips of the robots. However, at this time, when the valves are sent continuously and the application is repeated for each valve at a predetermined position, the application liquid used last time remains on the brush or sponge roller, and each time a fixed amount of application liquid is applied to the brush or sponge. The rollers could not contain the liquid, making it difficult to regulate the amount of liquid, resulting in dripping or smudging, making automation difficult.

[Means to solve the problem]

The present invention is characterized in that after the coating means is impregnated with the coating liquid, the coating means is squeezed under a predetermined pressure to control the amount of liquid retained and applied to the surface to be coated.

[Effect]

According to the above technical means, after a coating means such as a brush or a sponge roller is impregnated with a coating liquid, the coating means is squeezed with a predetermined pressure to regulate the amount of liquid and automatically apply it to the surface to be coated. [Example] An example of the coating method according to the present invention will be described below with reference to FIGS. 1 to 5. First, (9) is a coating means, such as a sponge roller, and (10) is a squeezing mechanism. The sponge roller (9) is held by a holder (l1) provided at the tip of the robot hand, and is impregnated with a coating liquid such as a graphite suspension. Squeezing mechanism (10
) has a large number of through holes (10
b! )... is closed with a lid body (lob),
It is placed near the coating liquid storage tank. A feature of the present invention is that the sponge roller (9) impregnated with the coating liquid is squeezed by the squeezing mechanism (10) before coating to regulate the amount of the impregnating liquid, and then the coating is started. The squeezing is performed by moving the sponge roller (9) in the direction of arrow (A) while pressing it against the surface of the lid (10 b ) with a predetermined pressure. Therefore, a specific example of an exterior conductive film coating apparatus using the above-mentioned squeezing mechanism (10) will be shown below with reference to FIGS. 2 and 3. In the figure, (1) is a valve, (12) is a robot hand, (9) is a coating means, (l4) is a coating liquid, (15)
is a storage tank. The above-mentioned bulb (1) is placed on a pair of conveyors (16) with the panel side facing downward, as shown in FIG.
Sent in a certain direction《. At this time, each pair of positioning bins (17a) - (17b) (17e) (17d) are used to position the four sides of the panel of the valve (1) at the application position.
There are positioning pins (17a) facing each other.
) (17b) reciprocates horizontally outward from the positioning position. Further, the positioning bins (17c) (17d) which are on the conveyor (16) and face each other are arranged on the conveyor (16).
The valve (1) is moved back and forth in a circular arc within a plane orthogonal to the conveyor (l6), and the valve (1) is positioned without interfering with the conveyance of the valve <1) from outside the conveyor (l6). Robot hand (12)
) is multi-jointed, for example, 6 axes (however, only 4 axes are shown in the figure)
Then, apply the application means (9) to the holder (11) attached to the tip.
) is pivotally supported, and as shown in FIG. 3, for example, the funnel part (1a) of the bulb (1) is covered with a concave graphite exterior conductive F! ! Apply (13) at the above application position. At this time, the robot hand (12
) are installed in succession, and the concave shape is divided into three straight parts (13a) (13b) (13c), and each straight part (13a) (L3b) (13c) is sequentially divided into three parts.
Three robot hands (12) with different coating positions
Apply it at Also, the drawing of the robot hand (l2)《
The pattern is controlled by a computer, and the Wi image pattern can be set arbitrarily by changing the program input. The coating liquid (14) is the material for the exterior conductive film (13), and is a suspension of water, an acrylic binder, and graphite. The storage tank (15) is located near the robot hand (12) and contains a coating liquid (14), and near the surface of the tank is a transfer drum partially immersed in the coating liquid (14). (l8) is rotatably supported horizontally, and
The squeezing mechanism (10) shown in Figure 1 is placed nearby. The transfer drum (18) has a pair of stirring blades (18a) on both peripheral ends thereof.
) (18b) are arranged at a constant pitch along the circumferential surface,
The distance (l) between each pair of blades (18a) (18b) is equal to @(W) of the sponge roller (9).

The operation based on the above configuration will be described below. First, place the positioning pins (17a), (17b), (17c), and (17d) on the left and right sides.
When the valve (1) is transported to that position, the positioning bins (17a) (17b) (1) are opened upward.
7c) Move (17d) left and right and downward to control the position of the valve (1) from all four sides. At some point, the robot hand (12) moves toward the storage tank (l5), and the sponge roller (9) at its tip enters between the blades (18a) and (18b) of the transfer drum (18) and comes into contact with the peripheral surface. to transfer and impregnate graphite suspension. Then, the sponge roller (10) is moved to the squeezing mechanism (10) placed near the storage tank (15), and the suspension is squeezed at a predetermined pressure to regulate the amount of liquid held. Therefore, the suspension is applied to one of the three straight parts (13a), (13b), and (13c) of the concave exterior conductive film (13) using the first robot hand (12). Furthermore, in the same manner as described above at the other two application positions, the other two of the three straight parts (13a), (13b), and (13c) of the concave-shaped exterior conductive film (13) are applied using the robot hand at each position. Apply the above suspension to the exterior conductivity III! (13) is formed. At this time, a storage tank (15) may be installed at each application position, or one storage tank (15) may be shared by three robot hands (12), and new The suspension is replenished into the tank.

Next, an apparatus for coating anode silicon in addition to the exterior conductive film (13) will be shown with reference to FIG. In the figure, (1) is a valve, (19) is a robot hand, (20) is a coating means, (21) is a coating liquid, and (23) is a storage tank. Immediately after applying the exterior conductive Km (13), the above-mentioned bulb (1) is placed on a pair of conveyors (16) with the panel side facing downward, as shown in Figure 4, and is fed in a fixed direction. go. At this time, at application position 1, each pair of positioning pins (23a) (23b) is attached to the four sides of the panel of the bulb (1).
) (23c) (23d) for positioning. The robot hand (19) is similarly multi-jointed, for example, with 6 axes (however, only 3 axes are shown in the figure), and a motor (24) attached to its tip.
A brush as a coating means (20) is connected to the rotating shaft of the valve (1), and by rotating the brush (20), donut-shaped anode silicon is coated on the funnel portion (1a) of the valve (1) at the above coating position. The coating liquid (21) is a material for the anode silicon, and is a silicon solution diluted with xylene. The storage tank (22) is located near the robot hand (19), and the coating liquid (21) is collected in the tank, and the brush (20) is squeezed near the surface of the storage tank (22). (25) is provided. The squeezing mechanism (25) is a brush (20)
The brush (20
) to regulate the amount of liquid held.

Based on the above configuration, its operation is shown below. First, move the positioning bins (23a) (23b) (23c) (23d) to the left and right.
The valve (1) is opened upward, and when the valve (1) is transported to that position immediately after coating the exterior conductive film (13), the valve (1) is opened in the positioning bins (23a), (23b), (23c), and (23d). ) is controlled by its position from the four sides. At the same time, the robot hand (19) moves to the storage tank (22) side, immerses the brush (20) at its tip in the silicone melt (21) for a certain period of time, lifts it up, stops it at a predetermined position, and squeezes the brush (20). (2
5), the brush (20) is squeezed at a predetermined pressure to regulate the amount of liquid retained. Therefore, the robot hand (19) rotates the brush (20) several times on the funnel part (1a) to apply donut-shaped anode silicon around the anode button.

At this time, silicone solution is sequentially replenished into the storage tank (22). Furthermore, the squeezing mechanism of the interior conductive film coating device will be described below with reference to FIG. In the figure, (26) is the application means, such as a sponge roller, (27) is the retained odor of the sponge roller (26) to which the tip of the robot hand is attached, and <28a) (2
8b) is a pair of nine squeezing rods arranged horizontally and rotatably in parallel;
) is made narrower than the diameter (d) of the graphite suspension, and, like the coating device shown in Figure 2, it is placed near the storage tank for the coating liquid made of graphite suspension.

In the above mechanism, the coating liquid is first applied to a sponge roller (26
), press the sponge roller (26) between 9 m (28a) and (28b) and pass through the gap until it rotates once. Then, most of the coating liquid remaining on the sponge roller (26) from the previous use is squeezed out, and the remaining liquid is removed. Next, as in FIG. 2, after the sponge roller (26) is transferred and impregnated with the coating liquid by the transfer drum pivotally supported in the storage tank, the sponge roller (26) is again transferred to the round rods (28a) (28b). ) between them at a specified pressure and squeeze gently to regulate the amount of liquid held. If drops of the coating liquid remain on the bottom surface of the sponge roller (26), the round rod (28a)
) (28b) to remove the drops and regulate the amount to an appropriate level. Thereafter, an interior conductive film is automatically applied by a robot hand to the inner surface of the valve funnel portion at a predetermined position before application of the exterior conductive film. After application, repeat the same operations as above, starting with squeezing to remove residual liquid. [Effects of the Invention] According to the present invention, after the application means is impregnated with the application liquid, the application means is squeezed under a predetermined pressure to control the amount of liquid retained and applied to the surface to be applied. The amount of liquid held in the means is stabilized, and the coating operation can be stabilized.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a squeezing mechanism showing an embodiment of the coating method according to the present invention, and FIGS. 2 and 3 are side views and portions showing a specific example of a coating device 9 using the squeezing mechanism shown in FIG. A plan view, FIG. 4 is a side view of a coating device using a pond squeezing mechanism showing another embodiment of the coating method according to the present invention, and FIG. 5 shows still another embodiment of the coating method according to the present invention. A perspective view of the squeezing mechanism shown in FIG.
7 and 7 are a partially sectional side view and a plan view of a coating mask of a conventional example of an exterior conductive film coating device for a cathode ray tube bulb, and FIG. 8 is a perspective view showing a conventional example of an anode silicon coating device for a cathode ray tube bulb. It is a diagram. (9) (20) (26) - Application means, (
10) (25) (28 a) (28 b
) 1=squeezing mechanism, (14) (21)・1 coating liquid. Patent applicant: Kansai NEC Co., Ltd.
Figure

Claims (1)

[Claims] (1) A coating method characterized by impregnating a coating solution into a coating device, and then squeezing the coating device under a predetermined pressure to control the amount of liquid retained and coating the surface to be coated.