JPH01187726A - Device for applying graphite for inner decoration - Google Patents

Abstract

PURPOSE:To enable uniform application of graphite on a cavity automatically by bringing a brush into contact with the cavity, and rotating the brush by an actuator. CONSTITUTION:A member to be driven and a funnel 1 are rotated by means of a motor 14. Since there is a constant relation between the cavity provided on the funnel 1 and a detection member provided on the driven member, when the position of detection member is detected by means of a sensor, and the motor 14 is stopped, the cavity is always stopped at a constant position. When a brush 29 is arranged so as to be in contact with the cavity with the rotation of a brush arm 27, graphite is applied to the cavity by abutting the brush 29 against the cavity after the stoppage of motor 14, and by rotating the brush with an actuator 28. It is thus possible to apply graphite to the cavity uniformly and automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interior graphite coating device for coating the inner surface of a funnel for a color cathode ray tube with graphite, and more particularly to an interior graphite coating device for coating a cavity portion.

[Conventional technology]

Generally, in a color cathode ray tube, in order to form an anode electric field, it is necessary to uniformly coat the inner surface of a funnel 1 with graphite 2, as shown in FIG.

Conventional interior graphite coating equipment has a problem in that a graphite-impregnated brush is applied to the inner surface of the funnel 1 and fixed, and the funnel 1 is rotated.

On the other hand, since a cavity (anode electrode) 3 is embedded in the funnel 1 made of glass as shown in FIG. There will be unevenness on the surface.

[Problem to be solved by the invention]

Since the cavity 3 of the funnel 1 has unevenness and the unevenness varies widely, conventional interior graphite coating equipment could not coat all the way to the concave portions, resulting in uncoated parts.

Therefore, in the past, the graphite film in all cavities was manually repaired.

An object of the present invention is to provide an interior graphite coating device that can automatically coat a cavity portion with uniform number ζ graphite.

[Means to solve the problem]

The above purpose is to provide a rotating shaft that positions and rotates the funnel, a driven member that is fixed to the rotating shaft and has a detection portion in a constant relationship with a cavity provided in the funnel, and a driven member that rotates the driven member. A motor, a sensor that detects a detection portion of the driven member and outputs a signal to stop the motor, a brush that contacts the cavity portion, an actuator that rotates the brush, and a brush that supports the actuator. This is achieved by rubbing the structure 1, which is equipped with one arm that rotates the funnel to the cavity abutting position and the funnel outer position tt,=.

[Effect]

The driven member and funnel are rotated by the motor. Since the cavity provided in the funnel and the detection part provided in the driven member have a fixed positional relationship, when the position of the detection part is detected by a sensor and the motor is stopped, the cavity always stops at the one-leg position. Therefore, it is important to arrange one brush so that the rotating brush arm contacts the cavity.As mentioned above, after the five motors have stopped, the brush should be brought into contact with the cavity part, and the brush will be rotated by the actuator. For example, graphite is applied to the cavity.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. A holder 4 holding the funnel 1 is fixed to a support arm 5. A rotary body (not shown) that rotates while positioning and holding the funnel 1 is disposed inside the holder 4, and a disc 7 is fixed to a rotating shaft 6 of this rotary body.

Since the above is a conventionally known structure, a detailed explanation of the structure will be omitted here. In addition, the rotating shaft 6 has a notch 8.
A cam 8 with a is fixed.

Here, the cam 8 is fixed to the rotating shaft 6 so that the notch 8a has a constant positional relationship with the cavity 3 when the funnel 1 is positioned and held by the aforementioned rotating body (not shown).

A support shaft 12 is rotatably supported via a bearing 11 on a base 10 which is arranged at an angle.

One end of a swing plate 13 is fixed to the support shaft 12 . A motor 14 is fixed to the other end of the swing plate 13, and a roller 15 disposed corresponding to the cam 8 is fixed to the output shaft of the motor 14. Also base plate 10f
Here, an air cylinder 16 is rotatably attached, one end of a lever 17 is rotatably attached to the operating rod of the air cylinder 16, and the other end of the lever 17 is rotatably attached to the rocking plate 13. It is being A rocking plate 13,
<-17, the shaft 18 is inserted through it, and the shaft 1
Bolts 19 and 20 are screwed into both ends of 8. Further, a spring 21 is attached to the shaft 18, and the rocking plate 13 is pushed upward by the spring 211 and comes into contact with the bolt 19, thereby restricting the upward position.

The base plate 10 also has a roller 15 in the notch 8 of the cam 8.
A sensor 22 is fixed via a support plate 23 to detect the position of the swing plate 13 in the state where the swing plate 13 is depressed.

A column 24 is arranged on the right side of the holder 4,
An actuator support plate 25 is fixed to the upper end of the support column 24. An actuator 26 rotatable through 90° is fixed to the actuator support plate 25, and one end of a brush arm 27 is fixed to the output shaft of the actuator 26. At the other end of the brush arm 27, an actuator 28 that reciprocates 180" is rotatably attached, and the output shaft of this actuator 28 has a sponge brush 29.
is fixed. Also actuator 2 old support plate 3
A stopper 31 is attached to the actuator 28 via the stopper 31, and the rotation range of the actuator 28 is restricted by the stopper 31.

Next, the effect will be explained. Funnel 1 to holder 4
After positioning and holding, the actuating rod of the air cylinder 16 is advanced.As a result, the roller 15 comes into pressure contact with the cam 8. Next, the motor 14 is started, the cam 8 is rotated by the roller 15, and the funnel 1 is rotated via the rotating shaft 6. When the cam 8 rotates and the roller 15 falls into the notch 8al of the cam 8, the rocking plate 13 rotates counterclockwise in FIG. As a result, the sensor 22 is turned on and the motor 14 is stopped. That is, the funnel 1 stops with the cavity 3 always at a constant position Cζ.

Next, the actuator 26 operates and the brush arm 27 moves to 90
The brush 29 is still in contact with the third part of the cavity. Here, since the actuator 28 to which the brush 29 is attached is rotatably attached to the brush arm 27, the brush 29
slides on the inner surface of funnel 1 and presses part 3 of cavity 1. In this state, the actuator 28 operates and the brush 29
For example, rotate it 180° x 3 times. As a result, graphite is evenly applied to the concave portion of the cavity 3.

The graphite coating on the 3 parts of the cavity can be done after or before coating the graphite 2 on the inner surface of the funnel 1 as in the conventional method.
〇Do it.

In addition, in the above embodiment, the cam 8 (this notch 8a
is provided so that the position of the swing plate 13 when the roller 15 falls into the notch 8a is detected by the sensor 22, but the cam 8 is a simple disk, and a hole is provided in this disk. The position of this hole may be detected by a sensor.

〔Effect of the invention〕

According to the present invention, it is possible to automatically apply graphite to the cavity portion, thereby improving work efficiency and quality.

[Brief explanation of the drawing]

Fig. 1 is a front view of an internal graphite coating device according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-AM in Fig. 1, Fig. 3 is a sectional view of the funnel, and Fig. 4 is a sectional view of the cavity portion. This is an enlarged view. 1...Funnel, 2...Interior graphite, 3
...Cavity, 6... Rotating shaft, 8...
・Cam, 8a... Notch, 13...
- Rocking plate, 14...Motor, 15...Roller, 22...Sensitive. Agent Patent Attorney Katsuo Ogawa (,1j□Figure 2 13: TχI #1 pole 14: Mo2 15: Roller 22: Sensor Figure 3 Figure 4 Figure 3: Cavity

Claims (1)

[Claims] 1. A rotating shaft that positions and rotates the funnel;
a driven member that is fixed to the rotating shaft and has a detection portion in a constant relationship with a cavity provided in the funnel; a motor that rotates the driven member; and a motor that detects the detection portion of the driven member and drives the motor. a sensor that outputs a signal to stop the brush, a brush that contacts the cavity portion, an actuator that rotates the brush, and a brush arm that supports the actuator and rotates the brush between a cavity contact position and a funnel outside position. Interior graphite coating equipment equipped with