JPH03184755A - Seal edge grinder of hollow glass article for picture tube - Google Patents

Abstract

PURPOSE:To have the grinding surface of a grinding table worn out uniformly over the whole surface and maintain a smooth surface at all times by decentering this grinding table from an arm shaft. CONSTITUTION:An arm shaft 11 is decentered to a turning center axis in a grinding table 10. Accordingly, when the rotative grinding of a seal edge surface of a hollow glass article 15 for a picture tube is performed on this grinding table 10, rotative grinding work takes place as the hollow glass article 15 and the polishing table 10 both reciprocatively slide relatively as far as two times over an eccentric value in the radial direction of the table 10. In consequence, the seal edge surface of the hollow glass article 15 rubs a top surface of the table 10 over the whole surface so that it is ground.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an apparatus for polishing seal edge surfaces of hollow glass articles for cathode ray tubes, such as funnels and panels.

[Conventional technology]

Television cathode ray tubes require a high degree of precision, so
The front panel and the rear funnel are manufactured separately, and after the necessary parts are assembled, they are sealed together. For this sealing, the seal edge surfaces of the panel and funnel are polished after glass molding.

For example, in the conventional apparatus for polishing the seal edge surface of the funnel, as shown in FIG. It was placed on the line.

[Problem to be solved by the invention]

With conventional equipment, when one type (size) of funnels (4) is continuously polished, a part of the polishing table (1) (the part that was in contact with the funnel) is damaged as shown in Figure 4. It becomes worn and dented.

Therefore, when polishing funnels of a different type (dimension) after continuing polishing of one type (dimension) of funnels for a certain period of time (especially when polishing funnels larger than the previous type (dimension)), However, there was a problem in that the seal edge had a portion that did not come into contact with the polishing table, making polishing work impossible. The same was true for the panels.

In order to solve this problem, it may be possible to prepare a polishing table for each type of product, but this would be expensive and require the work of replacing the polishing table every time the type of funnel or panel is changed, which is labor-intensive. , a problem arises that reduces production efficiency.

[Means to solve the problem]

The present invention was proposed in view of the above-mentioned problems of conventional polishing devices, and includes a rotating disc-shaped polishing table with a polishing surface on the upper surface, and a rotation center axis of the polishing table that is positioned above the polishing table. An eccentric arm shaft, a plurality of support arms attached radially from the arm shaft, a chuck support body attached to the support arms, and a hollow glass article for a cathode ray tube is chucked and the hollow glass article is rotated on a polishing table. A seal edge polishing apparatus for a hollow glass article for a cathode ray tube is constituted by a chuck body rotatably attached to a chuck support body so that the chuck body can be rotatably attached to a chuck support body.

[Effect]

Since the arm axis is eccentric to the rotation center axis of the polishing table, when rotary polishing of the seal edge surface of a hollow glass article for cathode ray tube is performed on the polishing table, the hollow glass article is rotated during one rotation of the polishing table. Rotary polishing work is performed while the polishing table and the polishing table are relatively reciprocated in the radial direction of the polishing table by twice the amount of eccentricity, and the seal edge surface of the hollow glass article is rubbed over the entire width of the upper surface of the polishing table. It becomes possible to perform rubbing and polishing.

〔Example〕

FIG. 1 is a schematic side view of the main parts of the apparatus of the present invention applied to polishing the seal edge of a funnel as a hollow glass article for a cathode ray tube, and FIG. 2 is a schematic plan view of the main parts, in which (10) is a polishing table, (11) ) is the arm shaft, (12) is the support arm, (13) is the chuck support body, (14) is the chuck body,
(15) shows a funnel.

The polishing table (10) has a disc shape with a polishing surface (10a) on the upper surface, and a rotation center shaft (16) in the center of the lower surface.
), this rotational center shaft (16) is rotatably supported by a bearing cylinder (18) provided on a support base (17), and a drive motor [ 19)
The rotational speed is reduced through the reduction gear mechanism (20) and driven to rotate.

The support stand (17) is slidably placed on the machine stand (21) via a slide guide (22).
The eccentricity adjustment mechanism (23) installed between the
) makes it possible to adjust the eccentricity it (e).

In the embodiment shown in FIG. 1, this eccentricity adjustment mechanism (23) includes a bolt (23a) provided on the support base (17) side, and a nut (23b) that is screwed with the bolt (23a) attached to a bracket (23c).
The support base (17) is moved on the machine base (21) by rotating either the bolt (23a) or the nut (23b). In this example, the eccentricity 1(e) is displayed by the indicator (25) on the support base (17) with respect to the forward/reverse eccentricity display scale (24) provided on the machine base (21). , other configurations are also possible.

The arm shaft (11) is connected to the rotation center axis (16) of the polishing table (10) through a bearing cylinder (26) to an upper support frame (21a) which is integrated with the machine base (21) above the polishing table (10). ).The arm shaft (11) is eccentrically supported rotatably with respect to the upper support frame (2).
1a) From the upper drive motor (27) to the reduction gear mechanism (28)
), the polishing table (10) is intermittently rotated in the opposite direction. Incidentally, the polishing slurry is supplied from the upper end of the arm shaft (11) onto the polishing table (process 0) through a conduit (not shown) passing through the center. This polishing slurry is made by mixing water with an abrasive such as sand, alundum, or serif, and is adjusted to a certain concentration, and has fluidity. A container (not shown) for receiving polishing slurry is provided around the lower part of the polishing table (10).

The support arm (12) includes a plurality of support arms (12) around the arm shaft (11).
In the illustrated example, six pieces are attached radially at equal intervals, and a chuck support (13) is attached to this support arm (12) so as to be movable up and down via a lift cylinder (29). In this case, the chuck support (13) is not directly connected to the piston rod (29a) of the lifting cylinder (29).
It is fitted so that it can move relatively in the vertical direction, and when the chuck support (13) is raised by the lifting cylinder (29), the stopper (
29b) so that it can be raised.

The chuck supporter (13) includes a chuck body (14).
is rotatably supported via a slide bearing (30) and slidably in the axial direction. This chuck body (1
4) is a rotating shaft (14a) portion, and this rotating shaft (14a)
A vacuum head (14c) rotatably mounted on the lower end of the unit via a thrust bearing (14b), and a vacuum pad (14d) attached to this vacuum head (14c).
), and the vacuum head (14c) is
Although not shown in the drawings, it is connected to an intake air source via a hose and a control valve, and is configured to suction and hold the funnel (5) by a vacuum pad (14d) during intake operation.

The rotating shaft (14a) of the chuck body (14) passes through the slide bearing (30) of the chuck support (13) and projects upward, and a stopper (
14e) is the installation. Corresponding to this stopper (14e), the zero weight (31) has a lift cylinder (32) for the weight (31) attached to the chuck support (13).
It is not directly connected to the piston rond (32a) of the lifting cylinder (32), but is fitted so that it can move relatively in the vertical direction, and when the weight (31) is raised by the lifting cylinder (32), the piston rond (32a) ) is configured to be raised by being hooked to a stopper (32b) at the lower end of the handle.

The embodiment of the device of the present invention has the above configuration, and its operation will be explained next.

The polishing table (10) and the arm shaft (11) are opposed to each other with an eccentricity (e) adjusted in advance by an eccentricity adjustment mechanism (23), and each drive motor (19)
(27), they are driven to rotate at low speeds in mutually opposite directions.

That is, the arm shaft (11) is intermittently rotated with one pitch being an angle equally divided by the number of support arms (work 2) installed, and the funnel (15) is rotated at one of the stop positions.
) is supplied with the seal edge surface (15a facing downward,
The chuck body (14) chucks this, and the weight (31)
Apply polishing pressure with .

Eccentricity 1 between polishing table (10) and arm shaft (11)
The setting (e) is such that the seal edge surface (15a) of the funnel (15) is biting slightly outward from the polishing table (10) at the maximum eccentric position, as shown on the right side of Fig. 1. It is desirable to set it so that it protrudes.

Funnel (1) chucked to each chuck body (14)
5) is the rotation of the polishing table (10) and the rotation of the arm axis (1).
1), a rotating couple acts in a fixed direction due to the difference between the circumferential speed of the part near the rotation center of the polishing table (10) and the circumferential speed of the part far from the rotation center, and the rotation couple acts on the chuck support (13). It rotates around the thrust bearing (14b) and revolves around the polishing table (10). During this l-revolution, the funnel (15) reciprocates in the radial direction of the polishing table (10) by twice the amount of eccentricity (e), and as a result, the polishing surface (10a) of the polishing table (10) The seal edge surface (15a) slides over the entire width in the radial direction, wears the polished surface (10a) uniformly over the entire surface, and creates a smooth polished surface (10a).
It becomes possible to maintain a).

The rotation speed of the polishing table (10) is determined by the arm axis (1
The rotation speed is higher than that in 1), and the rotation speed is continuous.

The polishing of the sealing edge surface (15a) of the funnel (15) is completed by one revolution of the arm shaft (11), and the supply station and take-out station of the funnel (15) are adjacent to each other.

The feeding and unloading of the funnel (15) is performed automatically by loading and unloading forks and the like.

For example, in the feeding position of the funnel (15), the chunk support (13) and the weight (31) are held at the upper end positions by the lifting cylinders (29) and (32), respectively, and the chuck body ( The funnel (15) is positioned and supplied directly below the funnel (14) with a loading fork,
First, the chuck support (13) is moved to the lifting cylinder (29).
), the chuck body (14) and the funnel (15) are aligned, a vacuum is applied to the vacuum pad (14c) of the chuck body (14), and the funnel is lowered by the vacuum pad (14d). (15
), the loading fork retreats, and at this time, the piston rod (29a) of the lifting cylinder (29)
) further descends and the funnel (15) is placed on the polishing table (
The stopper (29b) is brought into contact with the chuck support (13) at a position that is spaced downward from the chuck support (13).
31) is brought into contact with the upper surface of the chuck body (14), and even after this contact, only the piston rod (32a) is further lowered and is brought into contact with the stopper (32b) against the weight (31).
is made to wait in an unrelated position far below. This allows the funnel (1) to pass through the chuck body (14).
The polishing pressure applied to the seal edge surface (15a) in 5) is not due to the lifting cylinders (29) (32), etc., but is applied by the weight of the weight (31), and therefore,
The polishing pressure can be easily and accurately changed by changing the weight (31). Note that the present invention can be applied even if the polishing pressure is applied by air pressure or spring pressure. In addition, at the removal position of the funnel (15) after polishing, the elevating cylinder (32) first
The weight (31) is lifted, and then the lifting cylinder (
29), the chuck support (13), chuck body (14), and funnel (15) are lifted together, and the unloading fork is inserted under them. At this point, the vacuum head (14, c) is filled with suction air. Instead, compressed air is supplied to release the chuck of the funnel (15) by the vacuum band (14d), and after the funnel (15) after polishing is transferred onto the unloading fork, it is chucked by the lifting cylinder (29). The support body (13) is lifted, and in this state, the funnel (15) after polishing is taken out by the unloading fork.

Chuck support (13) supported by each support arm (12)
The seal edge surface (15a) of the funnel (15) is sequentially and continuously polished by the chuck body (14) and the chuck body (14).

In the above embodiment, the eccentricity adjustment mechanism (23) is provided on the polishing table (10) side, but it is of course possible to provide it on the arm shaft (11) side. In addition, in the case of a small funnel (15), the rotation effect may not be obtained due to the speed difference between the inner and outer circumferential surfaces of the polishing table (10), but in this case,
A rotational drive means is used.

Further, in the above embodiment, the arm shaft (11) is also rotated in the opposite direction to the polishing table (10), but the arm shaft (11) is not rotated and the polishing table (10) is rotated in the opposite direction. ), it is possible to apply an autorotation effect to the funnel (15) due to the difference in inner and outer circumferential speeds, and the polishing table (10) and arm shaft (1 machining) are made eccentric. , the polishing surface of the polishing table (10) can be worn uniformly. Furthermore, the apparatus of the present invention can be applied not only to funnels (15) but also to seal etching and nozzle polishing of panels.

〔Effect of the invention〕

According to the present invention, by simply setting the arm shaft and the polishing table eccentrically, the polishing surface of the polishing table can be uniformly worn over the entire surface, and a smooth surface can always be maintained. Hollow glass articles can be efficiently polished on the same polishing table.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the main parts showing one embodiment of the device of the present invention;
FIG. 2 is a schematic plan view of the main part, and FIGS. 3 and 4 are side views of the conventional apparatus before and after the polishing operation. (10)-polishing table, (11)...-arm axis, (
12) - Support arm, (13) - Chuck support, (14) - Chuck body, (15) - Funnel. Patent applicant Nippon Electric Glass Co., Ltd.
Rijin Gangwon Province Figure 1

Claims (1)

[Claims] (1) A rotating disk-shaped polishing table with a polishing surface on the top surface, an arm shaft eccentric to the rotation center axis of the polishing table above the polishing table, and multiple supports attached radially from the arm shaft. an arm, a chuck support attached to the support arm, and a chuck body rotatably attached to the chuck support for chucking a hollow glass article for a cathode ray tube and allowing the hollow glass article to rotate on a polishing table. A seal edge polishing device for hollow glass articles for cathode ray tubes, characterized in that: