JPH09272062A - Polishing device for glass article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deform a polishing surface of a polishing member follow a curved surface shape of a glass article so that polishing can be made more uniformly, by providing a rim integrally with an air bag in a peripheral edge part in an opposite to the polishing member of the air bag. SOLUTION: A polishing device 1 is constituted by an air bag 4 mounted with air-tightness in a mounting member 3 mounted in a lower end of a rotary shaft 2 and an annular polishing member 6 provided through a back material 5 in a lower surface of the air bag 4. The air bag 4 is formed of rubber quality elastic member so that a polishing surface of the polishing member 6 can be freely elastically deformed by following a curved surface shape of a glass article, a rim 7 is provided in a peripheral edge part in an opposite side the polishing member 6. A center holding fixture 8 of the polishing member 6 holds its center by flanges 11, 12 formed in a lower end of cylindrical members 9, 10, by interposing from both sides a center part of the air bag 4 and a center part of the back material 5. A hollow part 13 of the cylindrical member 10 is made to communicate with a supply hole 14 of polishing fluid of the rotary shaft 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass article polishing apparatus, and more particularly to an apparatus for polishing a panel glass for a cathode ray tube used in a television or the like.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for polishing a curved surface of a glass article such as a panel glass for a cathode ray tube, there has been known an apparatus in which a polishing surface of a polishing member is previously made to correspond to (match with) the curved shape of the glass article. To be However, since the shape of the polishing surface is substantially fixed in this polishing apparatus, it is possible to polish when the polishing surface is a curved surface with a single curvature, but a curved glass article in which a plurality of curvatures are combined is Cannot be polished. Therefore, it has been proposed to provide an airbag as a backup member for the polishing member so that the polishing surface can be deformed according to the curved shape of the glass article.

[0003]

However, in the conventional polishing apparatus equipped with an airbag, when the curved surface shape of the glass article is slightly different from the single curvature, the polishing surface follows the curved surface shape. Although it deforms and can be satisfactorily polished, when the curved surface shape of the glass article is a complex curved surface that is significantly different from a single curvature, it cannot be sufficiently deformed following the curved surface shape and uniform polishing cannot be performed. . Further, even when the glass article has a curved surface with a single curvature, more uniform polishing is desired to improve accuracy.

The present invention has been made in view of the above-mentioned drawbacks of the conventional polishing apparatus. The polishing surface of the polishing member is deformed in accordance with the curved shape of the glass article regardless of the curved shape of the glass article so that the polishing surface is more uniform. An object of the present invention is to provide a glass article polishing apparatus capable of polishing a glass article.

[0005]

SUMMARY OF THE INVENTION The present invention is a glass article polishing apparatus having an airbag as a backup member for the polishing member, wherein the airbag is integrally formed with the airbag at a peripheral portion of the airbag opposite to the polishing member. There is provided a polishing device for a glass article, which has a rim provided on the glass substrate. Here, the rim refers to a hollow annular portion.

According to the above construction, the rim of the peripheral portion of the airbag is deformed in accordance with the curved shape of the glass article.
In the case of polishing a glass article having a curved surface with a single curvature, the degree of tracking the curved surface shape of the polishing surface of the polishing member is improved and polishing can be performed more uniformly than in a polishing apparatus having no rim on the polishing surface. Further, when polishing a curved glass article having a combination of a plurality of curvatures, the degree of deformation of the polishing surface is improved as compared with a polishing apparatus having no rim on the polishing surface, and the curved surface shape of the glass article can be sufficiently followed. Can be satisfactorily polished.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In a preferred aspect of the present invention, the center holder of the polishing member is movable along the center axis thereof. With such a configuration, the followability of the polishing surface of the polishing member to the glass article is improved.

In another preferred aspect of the present invention, the center holder of the polishing member is adapted to be pushed out toward the glass article when air is introduced into the airbag. With such a configuration, it is possible to cope with more various shapes of the curved surface of the glass article to be polished. For example, in the case of a flatter curved surface or the like, polishing can be performed with good followability.

As described above, it is preferable to provide an airbag as a backup member for the polishing member so that the glass member can be polished in accordance with the curved shape of the article.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side sectional view showing an embodiment of a polishing apparatus of the present invention. In the polishing apparatus 1 of this example, an air bag 4 is airtightly attached to a mounting member 3 attached to a lower end of a rotary shaft 2, and a backing 5 is provided on a lower surface of the air bag 4.
And an annular polishing member 6 provided via The airbag 4 is made of a rubber-like elastic member so that the polishing surface of the polishing member 6 can be freely elastically deformed following the curved shape of the glass article, and the rim 7 is provided on the peripheral portion on the side opposite to the polishing member 6. Is provided.

The polishing member 6 is made of steel, cast iron, or a base material made of steel or cast iron with industrial diamond bonded to the surface thereof for rough polishing.
Also, for polishing polishing, felt, plastic,
Rubber or similar materials are used.

The center holder 8 of the polishing member 6 comprises a first tubular member 9 and a second tubular member 10 which penetrates this hollow portion and also the airbag 4 and the backing material 5. Flange 11, 1 formed at the lower end of both tubular members 9, 10.
The center of the polishing member 6 is held by sandwiching the center part of the airbag 4 and the center part of the backing material 5 from both sides thereof with 2. The hollow portion 13 of the second tubular member 10 communicates with a polishing liquid (slurry) supply hole 14 provided in the rotary shaft 2. Further, the rotating shaft 2, the first tubular member 9, and the airbag 4
In and, a supply hole 15 for supplying compressed air is provided.

According to the polishing apparatus having the above structure, the glass article on the polishing table (not shown) and the polishing member 6 connected to the rotary shaft 2 are rotated, respectively, and at the same time, the polishing liquid and the compressed air are supplied. The polishing surface is deformed by the airbag 4 so as to correspond to the curved shape of the glass article, and the rim 7 at the peripheral portion of the airbag 4 is further deformed to follow the curved shape of the glass article and Polish evenly. In this case, more uniform polishing is achieved by rotating the polishing table on which the glass article is mounted and swinging the mounting surface.

FIG. 2 is a view for explaining the fixed relationship between the respective members when the rotary shaft 2 of FIG. 1 is removed and half of the apparatus is viewed from the rotary shaft 2 side. The backing material 5 is fixed to the peripheral edge portion of the airbag 4 with a plurality of screws 16 at the peripheral edge portion. The airbag 4 is sandwiched between an upper annular member 17 and a lower mounting member 3 at a rim 7 portion thereof, and a plurality of screws 18 are provided.
Fixed at. The mounting member 3 is a screw 1 attached to the rotary shaft 2 of FIG.
Fixed at 9.

Further, the first tubular member 9 constituting the center holder 8 of the polishing member 6 is fixed to the mounting member 3 with a screw 20, and the second tubular member 10 is attached to the first tubular member 9 with a nut. 21
Fixed at. The compressed air supply hole 15 shown in FIG. 1 is arranged between the screw 20 and the screw 20 for fixing the first tubular member 9 to the mounting member 3.

FIG. 3 is a side sectional view showing a modification of the center holder 8 of the polishing member 6 of the polishing apparatus shown in FIG. In this example, the first cylindrical member 9 of FIG. 1 is provided so that the center holder 8 can slide between the attachment member 3 for mounting the airbag 4 and the center holder 8 of the polishing member 6.
A third tubular member 22 is further provided on the outer periphery of the third tubular member 22, and the third tubular member 22 is provided with a fourth tubular member 23 and an annular member 29 on the outer periphery thereof.
It is fixed to the mounting member 3 with a screw.

Between the third tubular member 22 and the fourth tubular member 23, there is provided a return spring 24 for the center holder 8 in which the first tubular member 9 and the second tubular member 10 are integrally formed. It is installed. A flange 25 is provided at the lower end of the third tubular member 22 to restrict the movement of the center holder 8 to the rotation shaft side (upper side) by coming into contact with the mounting member 3. Further, the upper end of the spring 24 is fixed to the second tubular member 10 via the annular member 26.

The outside of the annular member 26 is covered with a fifth tubular member 27 fixed to the fourth tubular member 23. The upper end of the fifth tubular member 27 and the annular member 26 are connected by a bellows 28. Even when the center holder 8 is moved by the bellows 28, the polishing liquid flowing inside is kept airtight so as not to leak.

According to the polishing apparatus of FIG. 3, although not shown,
When compressed air is introduced into the airbag 4 through a compressed air supply hole similar to that shown in FIG. 1, the center holder 8 projects downward against the spring 24, and can follow the curved shape of the glass article further. Can be uniformly polished. When the supply of compressed air is stopped after the polishing is completed, the center holder 8 returns to its original position by the spring 24.

[0020]

As described above, in the present invention, since the rim is provided at the peripheral portion of the airbag opposite to the polishing member, when polishing a glass article having a curved surface with a single curvature, Compared to a polishing apparatus having no rim on the polishing surface, the degree of follow-up of the curved surface shape of the polishing surface is improved, and polishing can be performed more uniformly. Further, when polishing a curved glass article having a combination of a plurality of curvatures, the degree of deformation of the polishing surface is improved as compared with a polishing apparatus having no rim on the polishing surface, and the curved surface shape of the glass article can be sufficiently followed. Good polishing is possible.

[Brief description of drawings]

FIG. 1 is a side sectional view of a polishing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the rotary shaft 2 of FIG.
The top view explaining the fixed relationship between each member of the state seen from the side.

3 is a cross-sectional view of a modified example in which a center holder 8 of a polishing member 6 of the polishing apparatus of FIG. 1 is slidably configured.

[Explanation of symbols]

 1: Polishing device 2: Rotating shaft 3: Mounting member 4: Air bag 5: Backing material 6: Polishing member 7: Rim 8: Center holder

Claims (3)

[Claims] 1. A polishing apparatus for a glass article, comprising an airbag as a backup member for the polishing member, wherein a rim integrally formed with the airbag is provided at a peripheral portion of the airbag opposite to the polishing member. Polishing device for glass articles. 2. The polishing apparatus for glass articles according to claim 1, wherein the center holder of the polishing member is movable along the center axis thereof. 3. The glass article polishing apparatus according to claim 2, wherein the center holder of the polishing member is adapted to be pushed out toward the glass article when air is introduced into the airbag.