JPH08227662A - Washing method and washing device for cathode-ray tube panel - Google Patents

Abstract

PURPOSE: To sufficiently wash the skirt section of a panel, and prevent the breakage of a cap follower. CONSTITUTION: This device has an ultrasonic displacement sensor 30 for detecting the displacement of a revolving arm 22 having a cap follower 23 and a nozzle 24 mounted in such a state as faced to the skirt section of a panel 2, and an arithmetic operation and control section for controlling and reducing a motor for driving the panel 2 at a position before the corner 2a of the panel 2, according the displacement of the arm 22 detected with the sensor 30. According to this construction, the rotation of the panel 2 is controlled on the basis of the copying position of the panel 2, thereby improving a washing effect for the corner 2a of the panel 2 and preventing the breakage of the cap follower 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cleaning a panel for a cathode ray tube.

[0002]

2. Description of the Related Art In the process of manufacturing a panel for a cathode ray tube, there is a coating process for coating graphite on the inner surface of the panel. In this coating process, unnecessary graphite attached to the skirt of the panel is washed away in the next cleaning process. . Conventional panel cleaning equipment
A cap follower and a nozzle are attached to the swivel arm so as to face the skirt portion of the panel, and the swivel arm is biased by the biasing means so that the cap follower is pressed against the skirt portion of the panel, and the panel is fixed by a motor. The nozzle is used to clean the skirt of the panel by rotating at a speed.

[0003]

Generally, a panel has a long side to short side ratio of 4: 3. In such a panel, there was no problem even if the panel was rotated at a constant speed as in the above-mentioned conventional technique. However, recently, a wide cathode ray tube having a horizontally long screen size compared to the conventional one has been provided, and a horizontally long wide panel having a long side to short side ratio of 16: 9 is provided. In such a wide panel, when the panel is rotated at a constant speed as in the prior art, the cap follower is abruptly displaced toward the corner in front of the corner of the panel, so that the graphite in the corner is sufficiently removed. It could not be cleaned, and there was a risk that the cap follower would be damaged by the bound of the cap follower.

An object of the present invention is to provide a method and apparatus for cleaning a panel for a cathode ray tube capable of sufficiently cleaning the skirt portion of the panel and preventing damage to the cap follower.

[0005]

According to the method of the present invention for achieving the above object, a cap follower and a nozzle are attached to a swivel arm so as to face a skirt portion of a panel, and the cap follower is a skirt portion of the panel. In the method of cleaning a panel for a cathode ray tube, wherein the swivel arm is biased by a biasing means so as to be pressed against, and the panel is rotated by a motor to clean the skirt part of the panel by the nozzle, the cap follower is a corner part of the panel. The feature is that the rotation of the panel is dropped before reaching.

In order to achieve the above object, the device of the present invention is such that a cap follower and a nozzle are attached to a swivel arm so as to face a skirt portion of a panel, and the cap follower is pressed against the skirt portion of the panel. In a cathode ray tube panel cleaning device in which a swivel arm is biased by a biasing means and a panel is rotated by a motor to clean a skirt portion of the panel by the nozzle, a displacement sensor for detecting displacement of the swivel arm and the displacement And a control means for controlling so as to reduce the rotation of the motor before the corner of the panel by the displacement of the swivel arm detected by the sensor.

[0007]

The displacement sensor reads the displacement of the revolving arm and determines the deceleration point of the rotation of the panel based on the displacement. Then, the rotation of the panel is dropped before the corner.
As a result, the time during which the water ejected from the nozzles hits the corners of the panel becomes longer and the cleaning effect is improved. Further, since the cap follower is displaced to the corner portion at a low speed, bounce is prevented and damage to the cap follower is prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 to 3, a motor 1 fixed to a moving member (not shown) that can be horizontally and vertically moved.
A panel holder 3 for holding the panel 2 is fixed to the output shaft of. Below the panel holder 3, a skirt rinse wiper generally designated by the numeral 10 is arranged.

The structure of the skirt rinse wiper 10 will be described below. A bearing 13 for rotatably supporting a horizontally arranged support shaft 12 is fixed on the pedestal 11, and a substantially central portion of a vertical swing arm 14 is fixed to the support shaft 12. A roller 15 is rotatably supported on one end of the vertical swing arm 14, and a coil spring 16 is applied to the other end of the vertical swing arm 14 and the pedestal 11 so as to pull the roller 15 upward. There is. An air cylinder 17 for pushing down the roller 15 is disposed below the other end of the vertical swing arm 14, and the air cylinder 17 is fixed to the pedestal 11.

A bearing 21 for rotatably supporting a vertically arranged supporting shaft 20 is fixed to the vertical swing arm 14, and a horizontally rotating swivel arm 22 is fixed to the supporting shaft 20. Has been done. At one end of the swivel arm 22,
A resin-made cap follower 23 and a nozzle 24, which come into contact with the inner surface of the skirt portion of the panel 2, are attached to the nozzle 24, and a pipe (not shown) for supplying water is connected to the nozzle 24. The coil spring 2 for biasing the cap follower 23 to the other end of the revolving arm 22 and the vertical swing arm 14 so as to abut the inner surface of the skirt portion of the panel 2.
It is multiplied by 5. The vertical swing arm 14 has an air cylinder 26 that retracts (retracts) the swing arm 22 from the inner surface of the skirt portion of the panel 2 against the coil spring 25.
Has been fixed.

An ultrasonic displacement sensor 30 for detecting the displacement of the swing arm 22 is attached to the vertical swing arm 14 so as to face the swing arm 22. Here, the ultrasonic displacement sensor 30 is attached to the up-and-down swing arm 14 such that the detection surface is perpendicular to the longitudinal centerline at the substantially central position of the turning motion range of the turning arm 22. The displacement detection result of the ultrasonic displacement sensor 30 is input to the arithmetic control unit 31, as shown in FIG. 4, and the arithmetic control unit 31 determines the deceleration point based on this displacement detection result, and through the driver 32 by this determination. The motor 1 is controlled to decelerate.

Next, the operation will be described. Although FIG. 1 shows the panel 2 in a predetermined position,
In the state before this, the operating rod of the air cylinder 26 is projected, and the revolving arm 22 is separated from the state of the solid line in FIG. 1 from the inner surface of the skirt portion of the panel 2 as shown by the two-dot chain line in FIG. 1 and FIG. Is in a state. Further, the operating rod of the air cylinder 17 projects and the roller 15 is separated from the sealing surface of the panel 2. In such a state, the panel holder 3 holds the panel 2 and holds the skirt rinse wiper 10
When it moves to the upper side and descends to a predetermined position, the operating rod of the air cylinder 17 retracts and then the operating rod of the air cylinder 26 retracts.

When the actuating rod of the air cylinder 17 is retracted, the vertical swing arm 14 is rotated clockwise about the support shaft 12 by the urging force of the coil spring 16 as shown in FIG. Press against the sealing surface of. As a result, the revolving arm 22 also moves up and down the swing arm 1.
4 rotates together with the cap follower 23 and the nozzle 24.
Is located at a predetermined height based on the sealing surface of the panel 2.
When the operating rod of the air cylinder 17 retracts after the operating rod of the air cylinder 17 retracts, in FIG.
The swing arm 22 rotates clockwise around the support shaft 20 by the urging force of the coil spring 25, and the cap follower 23 contacts the inner surface of the skirt portion of the panel 2. Subsequently, when the motor 1 is driven and the panel 2 rotates, the cap follower 23 moves following the inner surface of the skirt portion of the panel 2, and the revolving arm 22 revolves. Therefore, the nozzle 2
Unnecessary graphite adhering to the inner surface of the skirt portion of the panel 2 can be dropped by the water spouted from 4.

FIG. 5 shows the relationship between the rotation angle of the panel 2 and the displacement of the cap follower 23 in the case of a wide panel having a long side to short side ratio of 16: 9. As is clear from FIG. 5, from the front of the corner 2a of the panel 2 to the corner 2
The displacement of the cap follower 23 increases toward a.
That is, the swivel angles of the cap follower 23 and the swivel arm 22 increase near the corner portion 2a, and graphite near the corner portion 2a of the skirt portion of the panel 2 is less likely to fall off.

In this respect, in the present embodiment, an ultrasonic displacement sensor 30 for detecting the displacement of the revolving arm 22 is attached to the vertical swing arm 14. Therefore, since the displacement of the swing arm 22 is detected by the ultrasonic displacement sensor 30,
The relationship between the position of the panel 2 that the cap follower 23 follows and the detected displacement of the ultrasonic displacement sensor 30 is checked in advance, and the relation is detected by the arithmetic control unit 31 shown in FIG.
The deceleration point before a is stored in advance. Then, the ultrasonic displacement sensor 30 reads where the cap follower 23 follows the panel 2, and the corner portion 2a is read.
When it is displaced to the deceleration point before this, the arithmetic control unit 31 decelerates the rotation of the motor 1 via the driver 32.

In this way, the ultrasonic displacement sensor 30 reads the displacement of the revolving arm 22, determines the deceleration point of the rotation of the panel 2 based on the displacement, and slows down the rotation of the panel 2 before the corner 2a. The water ejected from the nozzle 24 has a longer time to reach the corner portion 2a of the panel 2 and the cleaning effect is improved. Further, since the cap follower 23 moves to the corner portion 2a at a low speed, bouncing is prevented and damage to the cap follower 23 is prevented.

In the above embodiment, the case of cleaning the inner surface of the skirt portion of the panel 2 has been described.
It goes without saying that it can also be applied to the case of cleaning the outer surface of the skirt part. Further, in the above embodiment, the swing arm 22
Although the case where the ultrasonic displacement sensor is used as the means for detecting the displacement of 1 has been described, it is needless to say that the invention can be applied to the case where a laser type sensor is used.

[0018]

According to the present invention, since the rotation of the panel is controlled by the copying position of the panel, the cleaning effect of the corner portion of the panel is improved and the damage of the cap follower is prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cleaning device for a cathode ray tube panel of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a block diagram showing the control means of FIG.

FIG. 5 is a diagram showing the relationship between the rotation of the panel and the displacement of the cap follower.

[Explanation of reference numerals] 1 motor 2 panel 2a corner portion 10 skirt rinse wiper 14 vertical swing arm 15 roller 22 swivel arm 23 cap follower 24 nozzle 25 coil spring 30 ultrasonic displacement sensor 31 arithmetic control unit

Claims (4)

[Claims] 1. A cap follower and a nozzle are attached to a swivel arm so as to face a skirt portion of a panel,
In the method of cleaning a panel for a cathode ray tube, wherein the cap follower is biased by a biasing means so that the cap follower is pressed against the skirt portion of the panel, and the panel is rotated by a motor to clean the skirt portion of the panel by the nozzle. A method of cleaning a panel for a cathode ray tube, characterized in that the rotation of the panel is stopped before the cap follower reaches a corner of the panel. 2. A cap follower and a nozzle are attached to the swivel arm so as to face the skirt portion of the panel,
In a device for cleaning a panel for a cathode ray tube, wherein the cap follower is biased by a biasing means such that the swivel arm is pressed against the skirt portion of the panel, and the panel is rotated by a motor to clean the skirt portion of the panel by the nozzle. A displacement sensor for detecting a displacement of the revolving arm, and a control unit for controlling so as to reduce the rotation of the motor in front of a corner portion of the panel by the displacement of the revolving arm detected by the displacement sensor. Cleaning device for cathode ray tube panels. 3. The swing arm is swingably attached to a vertically swingable arm that is rotatably supported by a roller that abuts a sealing surface of a panel and is vertically movable. Cleaning device for cathode ray tube panels. 4. The displacement sensor is attached to the vertical swing arm such that a detection surface is perpendicular to a longitudinal centerline at a substantially central position of a swing motion range of the swing arm. The apparatus for cleaning a cathode ray tube panel according to claim 2 or 3.