JP2512014B2 - Automatic weighing and feeding device for spacers - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spacer material dispersion device that can obtain a predetermined dispersion density, such as a spacer material for forming a gap used in a liquid crystal display panel. The present invention relates to a device that automatically and simply weighs highly accurately.

2. Description of the Related Art Conventionally, a gap for enclosing a liquid crystal, such as a liquid crystal display panel, needs to have a uniformity of several microns.
Therefore, as the spacer material used for forming the gap, minute beads having a diameter of about 5 microns are used. This spacer material, even if dispersed in a large amount in the liquid crystal display panel,
Since a gap defect occurs even if dispersed in a small amount, the spacer material supplied to the dispersion device is measured and used in units of 1/10 mg. The conventional example of this dispersing device will be explained with reference to FIG. . When the compressed gas is supplied from the compressed gas supply pipe 23 in this state, the compressed gas is ejected from the nozzle. At this time, a negative pressure is generated in the spacer supply pipe 24 due to the ejection of the compressed gas, and the hole 25 of the weighing pan 12
The spacer material 1 that has entered is sucked, and the spacer ejection port
It is ejected together with the compressed gas from 21 and adheres to the liquid crystal panel substrate (not shown) placed at the bottom. The spacer material was dispersed by the above apparatus, and the spacer material was supplied to the weighing dish by hand using a commercially available weighing meter.

Problems to be Solved by the Invention In supplying a spacer material to such a spacer material dispersing device, complete automation is desired in a clean mass production process such as a liquid crystal panel. However, since the spacer material has a very small diameter and the weighed value is 1/10 mg, it is 1/10 for air transportation such as powder supply of chemicals.
It is difficult to weigh mg, and it is scattered around and becomes a cause of obstructing the clean atmosphere. In view of this point, the present invention provides a device for weighing a spacer material with high accuracy and automatically supplying the spacer material to a spacer material dispersing device.

Means for Solving the Problems In order to solve the above problems, the present invention provides a base having a through hole filled with a spacer material, a means for vibrating the base, and a spacer material for the extra portion other than the through hole. The spacer material filled in the through hole is removed, and the spacer material is weighed using a transfer means for transferring the spacer material to the supply unit of the spraying device.
Supply automatically.

Action The present invention has the above-described configuration, and the spacer material is filled in the through hole, and the base having the through hole is vibrated to control the filling rate to a constant value. Then, by moving the base, the extra spacer material other than the through holes is removed, and only the portion filled in the through holes is transferred to the supply unit of the spraying device. As a result, the spacer is automatically weighed and supplied.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The guide port 3 of the container 2 in which the spacer material 1 is inserted is aligned with the through hole 5 provided in the base 4. The lower portion of the through hole 5 is closed by a guide rail 6 with a clearance smaller than that of the spacer material 1. The base 4 is configured to be slidable between the guide rail 6 and the container 2, and at the position where the base 4 abuts on the first convex portion 7 of the guide rail 6, the through hole 5 and the guide port 3 are aligned with each other. When the base 4 is in contact with the second protrusion 8 of the guide rail, the guide port 3 is closed by the base 4, and the through hole 5 is aligned with the opening 9 of the guide rail 6. Has become. These movements are performed by the moving cylinder 10, which is connected to the base 4. Further, a weighing dish 12 that engages with a supply unit 11 of a dispersing device (not shown) can be installed under the opening 9, and a ball 13 and a spring 14 are used for positioning so that the opening 9 and the weighing dish 12 are aligned with each other. It is locked.
The weighing pan 12 is configured to rotate about a shaft 15 and to be located on the supply cylinder 16 of the supply unit 11 and is driven by a motor 17 or the like. Further, the container 2 is provided with a vibration exciter so that the whole base 4 can be vibrated. The operation of the apparatus having such a configuration when used will be described. Spacer material 1
Has been put in the container 2 in advance, and the base 4 is in contact with the protrusion 7. By operating the vibrator 18 in this state, the spacer material 1 is supplied from the guide opening 3 to the through opening 5. When the vibration amplitude and the vibration time of this vibration exciter 18 are set to a predetermined value (in the experiment, vibration is about 10 seconds with a vibration width of 2 mm), the spacer material is filled at a filling rate of about 40% of the volume of the through hole 5. 1 is filled. Next, the moving cylinder 10 is operated by compressed air or the like to move the base 4 toward the convex portion 8. By doing so, the extra spacer material 1 from the coin passage hole 5 to the guide opening 3 is cut at the guide opening end portion 19, and the spacer material 1 has the amount of only the through hole 5 portion. The variation in the amount at this time is
Although it depends on the size of the through hole 5, it has a diameter of 2 mm and a depth of about 4.5 mm and is stable within a range of ± 0.4 mg. Next, the base 4 is brought into contact with the protrusion 8 and the through hole 5 is positioned above the basis weight plate 12. At this time, the base 4 is impacted on the protrusions 8 and brought into contact therewith, so that the spacer material 1 filled in the through holes 5 falls onto the weighing dish 12 due to the impact. After that, the motor 17 is driven to rotate the basis weight plate 12 to the supply unit 11 of the dispersion device (not shown), and the supply cylinder 16 is operated. Thereafter, the compressed gas is ejected from the nozzle 20, the negative pressure generated at that time is used to suck the spacer material 1, and the spacer material 1 is sprayed from the spacer ejection port 21. By the above, the spacer material 1 can be automatically weighed and supplied. Further, in the above, when the base 10 is brought into contact with the protrusion 8 by the moving cylinder 10, the spacer material 1 is applied to the weighing dish 12 by applying vibration by the vibrator 18 after the contact, without giving an impact. It is possible to loosen the spacer material 1 after dropping by dropping and then applying vibration even after dropping. This means that the spacer material 1 is aligned with the weighing dish 12, and the state in which the spacer material 1 is slightly tightened by filling the through holes 5 can be eliminated, and the agglomeration between the spacer materials caused by tightening is separated. The spraying condition can be further improved.

EFFECTS OF THE INVENTION As described above, according to the present invention, the spacer material can be automatically and stably weighed with high precision by a simple structure, and the spacer material can be supplied to the spraying device, so that the spacer material spraying step is automated. , Quality improvement can also be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a device for feeding and weighing a spacer material in one embodiment of the present invention, FIGS. 2 and 3 are sectional views of the device, and FIG. 4 is used in a conventional example and the present invention. It is sectional drawing of the supply part and nozzle part of a spacer material spreading device. 1 ... Spacer material, 3 ... Guide port, 4 ... Base, 5
...... Through hole, 11 …… Supply section, 12 …… Weighing pan.

Claims (2)

(57) [Claims] 1. A spacer material supplying device of a device for weighing and spraying a predetermined amount of spherical spacer material, comprising a base having a through hole for filling the spacer material, and means for vibrating the filled spacer material. An automatic weigher / feeder for spacer material, which has a transfer means for removing the extra spacer material other than the through-hole and transferring the spacer material filled in the through-hole to the supply section of the spraying device. 2. The automatic spacer material according to claim 1, wherein vibration is performed when the spacer is filled in the through-hole and when the filled spacer material is transferred to the supply portion of the spraying device. Weighing supply device.