JPH09115440A - Carbon trimming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure removal of carbon all over the periphery of a panel by providing a specific structure for a carbon trimming device to trim carbon deposited on the outer periphery of the cathode ray tube panel. SOLUTION: A carbon trimming device comprises a copying arm 2 to support a base end 6 at a supporting point in an oscillatable manner, an approximately L-shaped supporting member 3 formed by pivotally supporting the bent portion at the free end of the copying arm 2, a pair of trimmers (cylindrical brushes) 4 mounted on both pieces 3a, 3b of the supporting member 3, respectively, in opposition to the outer periphery of a cathode ray tube panel P and formed by arranging a trimming member (a brush) 4b on the opposite side of the outer periphery of the panel P and a thrust granting part 5 to grant the copying arm 2 energizing force to thrust the trimmers 4 against the outer periphery of the panel P. In this way, carbon can uniformly be removed from all long and short sides and corners of the panel P while positively thrusting each trimmer 4 against the outer periphery of the panel P.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a cathode ray tube (CR)
T) The present invention relates to a carbon trimming device suitable for use in removing excess carbon adhering and remaining on the outer peripheral surface of a panel when carbon is applied to the inner surface of the panel in a panel manufacturing process.

[0002]

2. Description of the Related Art Generally, when manufacturing a cathode ray tube panel, carbon (graphite) is filled in the gaps between the phosphors of the respective colors for the purpose of improving the contrast ratio of images. Therefore, for example, in an aperture grille type cathode ray tube panel, after forming carbon stripes corresponding to a desired stripe shape, red, green, and blue phosphor stripes are repeatedly formed in this order between the carbon stripes. ing.

By the way, when a desired carbon pattern (carbon stripe, etc.) is formed on the inner surface of the cathode ray tube panel, liquid carbon is applied to the inner surface of the panel. At this time, excess carbon is removed from the inner surface of the panel. When it is removed, carbon wraps around to the outer peripheral surface of the panel. Therefore, conventionally, after draining carbon from the inner surface of the panel, the panel skirt portion is dipped in an etching solution to remove unnecessary carbon leading to poor quality (frit leak, poor withstand voltage).

However, when the panel skirt portion is immersed in the etching liquid, the liquid level line L of the enching liquid is the sealing edge surface (joint surface with the funnel) of the cathode ray tube panel P as shown in FIG. Since the height SE is limited to a certain height H, the carbon attached to the face surface side S more than that is left as it is.

Therefore, conventionally, the following carbon trimming device has been used to remove the carbon remaining on the outer peripheral surface of the panel. FIG. 5 is a schematic view showing a configuration example of this type of carbon trimming device.
In FIG. 5, the cathode ray tube panel P is held horizontally by a vacuum suction pad 51 provided on the tip side of the index table 50. The vacuum suction pad 51 is connected to a motor 52, and the cathode ray tube panel P is rotated integrally with the vacuum suction pad 51 by driving the motor 52. Carbon trimming device 53
Is a thin plate-like enclosure cover 54 having an open upper side, a trimming unit incorporated in the enclosure cover 54,
An elevator 55 for raising and lowering the trimming unit together with the enclosure cover 54 is provided. Then, by rotating the index table 50, the enclosure cover 5 as illustrated.
When the cathode ray tube panel P is transferred to the position right above the elevator 4, the elevator 5
The main body of the apparatus is moved up by the driving of 5, so that the trimming unit performs a predetermined trimming operation while the cathode ray tube panel P is housed in the enclosure cover 54. Here, as the configuration of the trimming unit in the conventional apparatus, as shown in FIG. 6, a sponge 57 is attached to the tip of the fixed base 56 and the sponge 57 is pressed against the outer peripheral surface of the cathode ray tube panel P. The carbon adhering there was removed.

[0006]

However, in the above-mentioned conventional example, when the cathode ray tube panel P is rotated during trimming, the circle of the short side portion, the long side portion and the corner portion of the panel with the rotation center as the base point is used. Since there is a difference in circumferential locus, in order to constantly press the sponge 57 against the outer peripheral surface of the panel, at least the sponge length of the circumferential locus difference between the panel long side portion and the panel corner portion is required. Therefore, the sponge 57 itself has a weak rigidity, and the sponge pressing force against the outer peripheral surface of the panel is insufficient and it is difficult to remove carbon sufficiently.

Therefore, in the prior art, as shown in FIG. 7, a brush 59 is provided at the free end of the copying arm 58 swinging about the base end as a fulcrum, and the pressing spring 6 is attached to the copying arm 58.
There is also known a mechanism in which 0 is locked and the brush 59 is pressed against the outer peripheral surface of the cathode ray tube panel P by the urging force of the pressing spring 60. However, in the above-mentioned conventional technique, the contact surface with the brush 59 is switched by the rotation of the cathode ray tube panel P from the long side portion of the panel to the short side portion, or from the short side portion of the panel to the long side portion.
A so-called jumping phenomenon occurs in which the brush 59 is momentarily separated from the outer peripheral surface of the panel. This is because the displacement amount of the copying arm 58 when the brush 59 is pushed back against the biasing force of the pressing spring 60 while the copying arm 58 is swinging while being linked to the rotation operation of the cathode ray tube panel P. This is because the displacement acceleration changes abruptly when the brush 59 passes through the panel corner portion. Therefore, there is a problem that carbon residue is generated in the areas a, b, c, d on the panel hidden side as viewed from the brush 59 side with respect to the panel rotation direction during trimming. In addition, the rotation angle of the cathode ray tube panel P changes the contact angle of the brush 59 with respect to the outer peripheral surface of the panel, which causes a problem that uneven trimming is likely to occur.

The present invention has been made to solve the above problems, and an object thereof is to provide a carbon trimming device capable of surely removing carbon attached to the outer peripheral surface of a cathode ray tube panel. .

[0009]

The present invention has been made in order to achieve the above object, and is a carbon trimming device for trimming carbon adhering to the outer peripheral surface of a cathode ray tube panel, with a base end serving as a fulcrum. A copying arm supported so as to be swingable, a substantially L-shaped supporting member having a bent portion pivotally supported by a free end of the copying arm, and both pieces of the supporting member facing the outer peripheral surface of the cathode ray tube panel. A pair of trimming bodies mounted on the outer peripheral surface of the panel and provided with trimming members on the side facing the outer peripheral surface of the panel, and a pressing force applying portion for applying an urging force for pressing the trimming body to the outer peripheral surface of the panel to the copying arm. It has adopted a configuration with.

In the carbon trimming device of the present invention, when the biasing force is applied to the copying arm by the biasing force applying portion, the free end side of the copying arm moves toward the cathode ray tube panel side with the base end portion as a fulcrum, and the supporting member is supported. The pair of trimming bodies attached are pressed against the outer peripheral surface of the panel.
At this time, the copying arm oscillates in conjunction with the rotation operation of the cathode ray tube panel, and the support member rotates in accordance with the relative angular variation between the panel outer peripheral surface and the copying arm. As a result, the pair of trimming bodies are securely pressed against the outer peripheral surface of the panel at any of the long side portion, the short side portion and the corner portion of the cathode ray tube panel.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a plan view of an essential part showing an embodiment of a carbon trimming device according to the present invention, FIG. 2 is a sectional view taken along arrow A of FIG. 1, and FIG. 3 is a sectional view taken along arrow B of FIG. In the carbon trimming device shown in FIG. 1, a trimming unit is incorporated inside an enclosure cover 1 made of a thin plate of stainless steel or the like for housing a cathode ray tube panel. The trimming unit mainly includes a copying arm 2 having a U-shaped cross section, a substantially L-shaped support member 3, and a pair of cylindrical brushes 4 as trimming bodies.
The pressing force applying section 5 is provided.

As shown in FIG. 2, the copying arm 2 has its base end portion 2a fixed to the lower end portion of a stepped rotary shaft 6 via a rotation stop nut 7. The rotary shaft 6 is rotatably fitted and supported by a bearing member 8 fixed to the apparatus casing, and the copying arm 2 is swingably supported with the rotary shaft 6 as a fulcrum.

The support member 3 is a pair of cylindrical brushes 4 described above.
For supporting the free end 2 of the copying arm 2
It is attached to b with its bent portion pivotally supported.
That is, as shown in FIG. 3, a stepped rotary shaft 10 is fitted into the bent portion of the support member 3 through a pair of upper and lower bearings 9, and the lower end of the rotary shaft 10 is copied. It penetrates through the arm 2 and is fastened with a nut 11 from the back side of the arm.

The pair of cylindrical brushes 4 is composed of the supporting member 3 described above.
One piece is attached to each of the pieces 3a and 3b so as to face the outer peripheral surface of the cathode ray tube panel P. As shown in FIG. 3, each of the cylindrical brushes 4 is composed of a cylindrical brush core 4a as a core material and a large number of brush bristles 4b which are planted on the outer peripheral surface of the brush core 4a. . Brush core 4
A hole for brush attachment is opened at the center of a, and the rod 12 is inserted into this hole through the support member 3.
A male screw portion is formed at the tip of the rod 12, and the cylindrical brush 4 is fixed on the support member 3 in a rotation-restricted state by the tightening force of the nut 13 screwed onto the male screw portion.

The pressing force applying section 5 applies an urging force for pressing the cylindrical brush 4 to the outer peripheral surface of the panel.
The air cylinder 14 is connected to the base end portion of the copying arm 2 via the rotary shaft 6 by using the air cylinder 14 as a drive source. The main body of the air cylinder 14 is supported by the enclosure cover 1 via a support bracket 15. on the other hand,
As shown in FIG. 2, a retaining ring 16 is axially attached to the upper end of the rotary shaft 6 that supports the copying arm 2. Snap ring 16
A pair of upper and lower support plates 17 are fixed to the outer peripheral surface of the rod end piece 19, and a rod end piece 19 is rotatably connected between the support plates 17 by a connecting pin 18. A screw hole is formed in the rod end piece 19, and the output rod 14 of the air cylinder 14 is inserted into this screw hole.
a is screwed in and fastened with a nut or the like.

Next, the operation of the trimming device having the above structure will be described. First, when the cathode ray tube panel P is transferred right above the trimming device by the rotation of the index table (not shown), the main body of the device is raised by the drive of the elevator (not shown), and the cathode ray tube panel P is enclosed in the cover 1. To house. At this point, the air cylinder 14
Of the cylindrical brush 4 by pushing out the output rod 14a of
Are arranged so as to face the outer peripheral surface of the panel and be separated from each other by a predetermined distance. Next, when the cathode ray tube panel P starts to rotate by driving a motor or the like, the output rod 14a is pulled toward the cylinder body side by suction of air from the air cylinder 14. As a result, the pulling force of the output rod 14a is converted into a rotational force by the support plate 17 and the retaining ring 16, so that the rotational shaft 6 receives the rotational force.
Rotates counterclockwise. Then, the free end 2b side of the copying arm 2 moves to the panel side around the rotating shaft 6, whereby each cylindrical brush 4 on the support member 3 is pressed against the outer peripheral surface of the cathode ray tube panel P.

Here, the polar tube panel P has the following structure.
Since there is a difference between the distance from the panel rotation center to the panel long side and the distance to the panel corner, the displacement angle of the copying arm 2 from the initial position is that the cylindrical brush 4 is at the center of the panel long side. The displacement angle .theta.1 when pressed into contact with is maximized, and the displacement angle .theta.2 when the cylindrical brush 4 is pressed into contact with the panel corner portion is minimized. Therefore, at the time of trimming, the copying arm 2 swings within the angle range of Δθ (θ1−θ2) in conjunction with the rotation operation of the cathode ray tube panel P.

At this time, a regulator or the like is provided in the air supply system connected to the air cylinder 14 so that the air pressure in the cylinder is always controlled to be constant, so that the cylindrical brush 4 is uniformly pressed over the entire outer peripheral surface of the panel. be able to. Further, as the trimming body, since the cylindrical brush 4 having the cylindrical bristles (trimming member) 4b on the side facing the outer peripheral surface of the panel is adopted,
The following merits are obtained. (1) Trimming member (brush) for the outer peripheral surface of the panel
It is possible to keep the contact angle of the ball constant. (2) Since the peripheral surface of the trimming member can be used in a multifaceted manner during trimming, for example, when the brush bristles 4b, which are the trimming member, are consumed, the nut 12 can be loosened and the brush core 4a can be rotated by a fixed angle. The new brush bristles 4b can be pressed against the outer peripheral surface of the panel, and the life of the brush can be significantly extended. In order to make the contact angle of the trimming member with respect to the outer peripheral surface of the panel constant, it is not necessary to implant the bristles 4b over the entire circumference of the brush core 4a, which is the core material, and only on the side facing the outer peripheral surface of the panel. It is also possible to simply implant the bristles 4b within a predetermined angle range (for example, a range of 180 °).

In addition to this, when the cylindrical brush 4 is pressed against the outer peripheral surface of the cathode ray tube panel P, the copying arm 2 swings in conjunction with the rotating operation of the cathode ray tube panel P, and the outer peripheral surface of the panel is also moved. The support member 3 rotates about the rotation support shaft 10 in accordance with the relative angular fluctuation between the scanning arm 2 and the scanning arm 2.
As a result, the support member 3 is always held in a posture in which the support member 3 faces the outer peripheral surface of the panel, and when the pair of cylindrical brushes 4 passes through the corners of the panel, the support member 3 is rotated in accordance with the movement. Thus, the displacement amount and displacement acceleration of the copying arm 2 can be suppressed to be smaller than in the conventional case. As a result, the jumping phenomenon of the trimming body at the panel corner portion is prevented, so that the entire circumference of the panel can be trimmed while the pair of cylindrical brushes 4 are reliably pressed against the outer peripheral surface of the panel.

Incidentally, during trimming, cleaning water is sprayed from the nozzle (not shown) provided outside the cathode ray tube panel P to the outer peripheral surface of the panel, so that the cylindrical brush 4 is used.
The carbon trimmed by is washed away by the washing water. When the trimming is completed after a lapse of a predetermined time, the output rod 14a is pushed out by the supply of the compressed air to the air cylinder 14, and the reciprocating operation of the copying arm 2 accompanying this causes the cylindrical brush 4 to be removed from the outer peripheral surface of the panel. Leave.

In the present embodiment, the trimming body has a structure in which a large number of brush bristles 4b are planted on the outer peripheral surface of a cylindrical core material (brush core) 4a. Although not shown, it is also possible to adopt a structure in which a sponge is attached to the outer peripheral surface of a tubular core material. Further, in FIG. 1, the mounting positions of the cylindrical brushes 4 with respect to the support member 3 are set to be substantially equidistant from the rotary support shaft 10. However, regarding the mounting positions of the brushes, the outer diameter of the cathode ray tube panel ( (Vertical and horizontal dimensions), the outer diameter of the brush itself, and the swing angle (Δθ) of the copying arm 2 during trimming
It can be appropriately set in consideration of the above.

Further, with respect to the structure of the pressing force applying portion 5, the mechanical mechanism using the air cylinder 14 as a driving source is adopted in the above-mentioned embodiment, because the so-called large panel or the aspect ratio of 16: 9. When a wide panel is to be processed, the cylindrical brush (trimming body) 4 can be pressed against the outer peripheral surface of the panel with a uniform and sufficient force even if the swing angle Δθ of the copying arm 2 during trimming is large. This is because. Therefore, when a relatively small panel is to be processed, the copy arm 2 during trimming is used.
Since the swinging angle Δθ of 3 may be small, a configuration may be adopted in which the urging force of a spring or the like is simply applied to the copying arm 2 and the cylindrical brush 4 as a trimming body is pressed against the outer peripheral surface of the panel.

[0023]

As described above, according to the carbon trimming device of the present invention, a substantially L-shaped support member is pivotally supported at the free end of the copying arm urged toward the cathode ray tube panel side by the pressing force applying portion. By adopting a configuration in which a trimming body is attached to both pieces of this support member, when the cathode ray tube panel is rotated, the copying arm swings in conjunction with the panel rotation operation and the panel outer peripheral surface The support member rotates according to the relative angular fluctuation between the scanning arm and the scanning arm. As a result, the long side of the cathode ray tube panel,
In each of the short side portion and the corner portion, it becomes possible to trim the carbon uniformly over the entire circumference of the panel while surely pressing the individual trimming bodies against the outer peripheral surface of the panel. As a result, it is possible to improve the work efficiency in the carbon trimming process, and it is possible to remove all the carbon adhering to the outer peripheral surface of the panel,
The quality of the cathode ray tube panel is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken in the direction of arrow A in FIG.

FIG. 3 is a sectional view taken in the direction of arrow B in FIG. 1;

FIG. 4 is a diagram illustrating a pre-trimming process.

FIG. 5 is a schematic diagram showing a configuration example of a carbon trimming device.

FIG. 6 is a schematic plan view showing a conventional example.

FIG. 7 is a schematic plan view showing another conventional example.

[Explanation of symbols]

 2 Copying arm 3 Supporting member 4 Cylindrical brush (trimming body) 4a Brush core (core material) 4b Brush bristles (trimming member) 5 Pressing force applying part P Cathode ray tube panel

Claims (4)

[Claims] 1. A carbon trimming device for trimming carbon adhering to an outer peripheral surface of a cathode ray tube panel, wherein a copying arm swingably supported with a base end as a fulcrum, and a bending portion at a free end of the copying arm. A substantially L-shaped supporting member that is pivotally supported, and a trimming member that is attached to both pieces of the supporting member in a state of facing the outer peripheral surface of the cathode ray tube panel and on a surface facing the outer peripheral surface of the panel. A carbon trimming device comprising: a pair of trimming bodies formed by the above, and a pressing force applying portion that applies an urging force for pressing the trimming body to the outer peripheral surface of the panel to the copying arm. 2. The carbon trimming device according to claim 1, wherein the trimming body has a cylindrical trimming member on the side facing the outer peripheral surface of the panel. 3. The carbon trimming device according to claim 2, wherein the trimming body comprises a tubular core material and a large number of brush bristles planted on the outer peripheral surface of the core material. 4. The carbon trimming device according to claim 2, wherein the trimming body includes a tubular core material and a sponge attached to an outer peripheral surface of the core material.