JPH01168374A - Application device - Google Patents

Abstract

PURPOSE:To permit uniform application of paint with a specified thickness at a specified position on a work by holding a work to be coated with a work chuck and automatically controlling a work rotating mechanism, a needle moving mechanism and a syringe actuating mechanism by using a control part. CONSTITUTION:A work chuck 11 holds a work 1 to be coated. A work rotating mechanism 17 changes the position of the work 1 by rotating the work chuck 11. A needle 21 provided above the work chuck 11 discharges paint to the work 1. Further, a needle moving mechanism 31 moves the needle 21 to the work 1 three-dimensionally. In addition, a syringe 22 supplies paint to the needle 21. A syringe actuating mechanism 25 controls the supply of paint from the syringe 22. A control part 52 controls the mechanisms 17, 31, 25. Consequently, paint can be applied in a specified thicknees at a specified position on the work and thus the quality and productivity of a product can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a coating device, for example, one that coats an insulator as a paint onto a resistor used in an electron gun of a color cathode ray tube.

(Prior art) Generally, the resistor used in the electron gun of a color cathode ray tube is
It consists of a rectangular substrate made of ceramic, etc., coated with high- and low-resistance materials on the bottom surface, and both top and bottom surfaces coated with insulating glass.

A plurality of metal terminals for obtaining a required resistance value are attached to this resistor by caulking, so as to provide electrical continuity to various parts of the electron gun.

If this resistor is assembled into an electron gun in this state, glow discharge will occur from the caulked part of the metal terminal and the long side edge of the resistor, resulting in converter misalignment that will adversely affect the characteristics of the color cathode ray tube electron gun. (The G, B, and H electron beams deviate from their normal orbits).

Therefore, in order to prevent this glow discharge, insulating glass is applied to the caulked portion of the metal terminal and the edges of the two long sides of the resistor.

To apply this insulating glass, the worker uses a fine brush to fully soak the insulating glass paint, which has been adjusted to an appropriate viscosity with an alcohol-based solvent, carefully carries the brush, and caulks the metal terminal. This is done by filling in the edges of the resistor and the two long sides of the resistor.

This application procedure using a brush will be explained with reference to FIG.

As shown in Figure 2), the operator
Bend the four metal terminals 2 protruding from side a, place the resistor 1 on the work desk with the top surface 1b facing up, and lightly pinch the left end of the resistor 1 with your left hand to ensure that the resistor 1 is Try not to wobble.

Then, the brush 3 held in the right hand is dipped in the paint 5 in the beaker 4 so that the paint 5 is absorbed, and the brush 3 is sequentially moved circularly against the caulked portion 2a of the metal terminal 2 to apply the paint.

Next, as shown in Fig. 2 (f), grasp the base of the metal terminal 2 on the left side, and with the long side edge 1C of the resistor 1 facing up, apply the paint by running the brush 3 from side to side. Then, turn the opposite long side edge 1C upward and repeat the same operation.

(Problems to be solved by the invention) Manual application using a brush as described above requires
There are the following problems.

■ As shown in Figure 3 (A>), when applying to the caulked part 2a of the gold i terminal 2, paint 5 is applied to the inner surface 2b of the caulked part 2a.
If it is difficult to apply without dripping and the amount of paint 5 is large, the paint 5 will wrap around from the inner surface 2b of the caulked portion 2a to the lower surface 1a of the resistor 1, causing the caulked portion 2a of the metal terminal 2
The contact portion between the resistive material 6 and the low-resistance material 6 may be insulated.

■ When applying to the long side edge 1C of the resistor 1, as shown in Figure 3 (0), the tip of the brush 3 tends to separate, and the lower surface 1a and upper surface 1b of the resistor 1 are also coated excessively. and degrade the quality of the product.

(2) Depending on how the brush 3 is pressed and how the paint 5 is applied, the coating distance may vary, the film thickness may not be stable, the coating may be uneven, and the effect of preventing glow discharge may be reduced.

■ Workability is poor and production volume does not increase.

The present invention has been made in view of these points, and aims to improve sagging, uneven coating, and low productivity caused by manual work and the use of brushes.

(Structure of the Invention) (Means for Solving the Problems) The coating device of the present invention includes a work chuck that holds a work to be coated with paint, and a work rotation that changes the posture of the work by rotating the work chuck. a mechanism, a needle provided above the workpiece chuck for discharging paint onto the workpiece, a needle movement mechanism for moving the needle three-dimensionally relative to the workpiece, a syringe for supplying paint to the needle, and a needle discharging paint onto the workpiece; The apparatus includes a syringe operating mechanism that controls the supply of paint, and a control section that controls the work rotation mechanism, the needle moving mechanism, and the syringe operating mechanism.

(Function) The coating device of the present invention holds a workpiece to be coated with a paint on a workpiece chuck, and controls a control unit to control a workpiece rotation mechanism,
Automatically controls the needle movement mechanism and syringe operating mechanism,
The workpiece chuck is rotated by the workpiece rotation mechanism to face the part of the workpiece to be coated upward, and the needle is moved three-dimensionally by the needle movement mechanism to the part of the workpiece to be coated. The paint is supplied from the needle to the needle, and is discharged from the needle onto the part of the workpiece to be coated.

(Example) An example of the coating apparatus of the present invention will be described with reference to FIG.

In this embodiment, as explained in FIGS. 2 and 3, the metal terminal 2 of the resistor 1 used in the electron gun of the color cathode ray tube
An insulating glass paint 5 whose viscosity has been adjusted to an appropriate level using an alcohol-based solvent is applied to the caulked portion 2a and the long side edge 1C of the resistor 1.

In the figure, 11 is a work chuck, and this work chuck 11 has two guide shafts 13 installed at the tip of a rotary table 12, and supports a clamping table 14 movably on these two guide shafts 13. , a tension spring (not shown) is stretched between the clamping table 14 and the rotating table 12, and the clamping table 14 is biased in the direction of the rotating table 12.
4 and a notch 14a provided in the opposing part of the rotary table 12,
A resistor 1 used for an electron gun of a color cathode ray tube as a work to be coated with the paint 5 is fitted into the terminal 12a, and the resistor 1 is held by clamping, and the terminal 2 is to which the paint 5 is applied.
Upper surface 1b of resistor 1 with caulking portion 2a and resistor 1
The side edges 1C of the two long sides are exposed on the surface.

The rear part of the rotary table 12 of the work chuck 11 is rotatably supported by a frame (not shown) via a bearing 16, and is connected to a pulse motor 17 as a work rotation mechanism. A workpiece chuck 11 is rotated by a motor 17 to change the attitude of the resistor 1. In this embodiment, the terminal to which the paint 5 is applied can be adjusted at three angles: O"+90°-180°. The upper surface 1b of the resistor 1 with the two caulked portions 2a and the two long side edges 1C of the resistor 1 are sequentially directed upward.

21 is a tubular needle, and this needle 21 is filled with paint 5.
The other end of the syringe 22 is hermetically sealed with a cap 23, and one end of a flexible tube 24 is attached to the cap 23. is connected, and the other end of this tube 24 is connected to a syringe operating mechanism 25,
This syringe operating mechanism 25 supplies high pressure air to the tube 24.
The paint 5 in the syringe 22 is supplied to the needle 21, and the paint 5 is discharged from the tip of the needle 21.

The needle 21, together with the syringe 22,
The needle movement e i 1I31 allows the needle to move three-dimensionally relative to the resistor 1 above the workpiece chuck 11 .

That is, the needle moving VJ mechanism 31 drives a ball screw 34 by a servo motor 33 equipped with a Y-axis encoder 32, and also moves a movable block 35 threaded through the ball screw 34 in the horizontal X-axis direction. , this X
The ball screw 3 is controlled by a servo motor 37 with a Y-axis encoder 36 attached to a movable block 35 in the axial direction.
8, a movable block 39 threaded through the ball screw 38 is moved in the horizontal Y-axis direction perpendicular to the X-axis, and an encoder 40 for the Z-axis is attached to the movable block 39 in the Y-axis direction. By the servo motor 41 of
While driving the ball screw 42, this ball screw 4
A movable block 43 screwed through the
The needle 21 and the syringe 22 are attached via a needle holder 44 and a syringe holder 45 to a movable block 43 that is movable in three directions, that is, three dimensions: the axis, the Y axis, and the Z axis.
is held vertically toward the resistor 1.

The servo motors 33, 37, and 41 for the Y axis, Y axis, and Z axis of this needle transfer @ 11 structure 31 are
- It is controlled as specified by the Z-axis controller 51 based on data input in advance, and this x-y-z-axis controller 51 includes encoders 32, 36 for the Y-axis, Y-axis, and Z-axis. From .40, the drive status of the Y-axis, Y-axis, and Z-axis servo motors 33.37°41 is fed back, and furthermore, this X-Y
- The Z'NI controller 51, the pulse motor 17, and the syringe operating mechanism 25 are controlled by the control section 52, and the controls t11IFil152,
- Y-axis, Y-axis, and Z-axis servo motors 33 of the needle moving mechanism 31 via the Y-Z axis controller 51.
37 and 41, the posture of the resistor 1 is controlled via the pulse motor 17, and the syringe operating mechanism 2
5, the discharge timing, discharge amount, and discharge time of the paint 5 are controlled, and the movement of the entire coating device is managed.

Note that the needle 21 is operated by servo motors 33, 37, and 41 for the X@, Y, and Z axes of the needle moving mechanism 31.
Its movement is controlled by a numerical control system.

In this embodiment, when the resistor 1 is held on the workpiece chuck 11 and the start operation is performed, the control unit 5
2, a pulse motor 17 that changes the attitude of the resistor 1, and a needle moving mechanism 31 that moves the needle 21 three-dimensionally.
Servo motor 33.3 for Y axis, Y axis and Zr2
7.41 and a syringe operating mechanism 25 that supplies high pressure air to the syringe 22 and discharges the paint 5 from the needle 21.
is controlled, and the work chuck 11 rotates to apply the paint 5 to the part of the resistor 1, that is, the upper surface 1b of the resistor 1 where the caulking part 2a of the terminal 2 is located, and the two long side edges 1C of the resistor 1. 2a of this terminal 2, facing upward in order.
The needle 21 moves three-dimensionally with respect to the two long side edges 1C of the resistor 1 and the caulked portion 2a of the terminal 2 and the two long side edges 1C of the resistor 1. The paint 5 is discharged from the needle 21, and therefore the caulked portion 2a of the terminal 2 and the two long side edges 1 of the resistor 1 are
The paint 5 can be evenly applied to C with a constant film thickness, and glow discharge can be effectively prevented.

Then, when applying the coating to the caulked portion 2a of the metal terminal 2, it is applied from the inner surface of the caulked portion 2a to the lower surface 1a of the resistor 1! 15
Therefore, the dripping paint 5 does not insulate the caulked portion 2a of the metal terminal 2 and the resistance material.
Furthermore, when applying the coating to the long side edge 1C of the resistor 1, no excess coating is applied to the lower surface 1a or upper surface 1b of the resistor 1, and therefore, the quality of the product is not degraded. ,
Moreover, workability and productivity are improved.

Note that the needle 21 is operated by servo motors 33, 37, and 41 for the X-axis, Y-axis, and Z-axis of the needle moving mechanism 31.
Since the movement of the machine is controlled by a numerical control system, it is possible to respond to changes in product types extremely easily and quickly.

(Effects of the Invention) As described above, according to the present invention, paint can be applied automatically, so that the paint can be uniformly applied to a predetermined thickness at a predetermined position on a workpiece to be coated. It is possible to improve product quality and productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of an embodiment of the coating apparatus of the present invention, FIG. 2 is a perspective view showing a conventional coating method, and FIG. 3 is a sectional view showing its drawbacks. 1. Resistor as workpiece, 5. Paint, 11. Workpiece chuck, 17. Pulse motor as workpiece rotation mechanism, 21. Needle, 22. Syringe, 25.
- Syringe operating mechanism, 31... Needle moving mechanism, 52
...Control unit. (A) Kaya 41 CB)

Claims (1)

[Claims] (1) A work chuck that holds a work to be coated with paint, a work rotation mechanism that rotates the work chuck to change the posture of the work, and a needle that is installed above the work chuck and discharges paint onto the work. , a needle movement mechanism that moves the needle three-dimensionally relative to the workpiece, a syringe that supplies paint to the needle, a syringe operating mechanism that controls the supply of paint from the syringe, a workpiece rotation mechanism, and a needle movement mechanism. A coating device comprising: a mechanism; and a control section that controls the syringe operating mechanism.