JPH07120763A - Rubbing device for oriented film of liquid crystal display element - Google Patents

Abstract

PURPOSE:To provide the rubbing device which is used for the oriented film of a liquid crystal display element which is disposed with a roller wound with rubbing cloth on its surface above a liftably installed table and which is capable of exactly checking the parallelism of the roller and the table, adjusting the parallelism between the same, dealing with the wear and permanent set of lying down of the hair tips of the rubbing cloth and distinctly judging the termination of the period for exchanging the rubbing cloth. CONSTITUTION:The table 13 or a supporting member 17 is supported by piston rods of three pieces of electrically driven cylinders 13 disposed in such a manner as to exist at the vertex of a triangular shape. Three pieces of these electrically driven cylinders 13 are respectively held by interposing load cells 9 therebetween. These load cells 9 are electrically connected via amplifiers 11 for the load cells to a controller 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus for rubbing an alignment film for a liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, as this type of device, as disclosed in Japanese Patent Laid-Open No. 3-175423, a table is provided so that it can be lifted and lowered by a pressure transmission mechanism, and a pressure detection / control device is provided in the pressure transmission mechanism. It is electrically connected and a roller support rack is arranged above the table so that it can be adjusted up and down.A roller wrapped with a rubbing cloth is rotatably mounted on the roller support rack to detect the pressure transmission mechanism and pressure detection. With the control device, the gap between the base fabric surface of the rubbing cloth and the coating film for the alignment film is controlled so that the coating film for the alignment film on the glass substrate always contacts the surface of the rubbing cloth with a constant pressure, so that the film is uniform. There is a method in which an alignment film having stable alignment performance is obtained.

[0003]

However, in the conventional device thus constructed, the parallelism between the roller and the table cannot be accurately checked, and the parallelism between them can be adjusted. It is difficult, and it is not possible to deal with abrasion of the tips of the rubbing cloth and lying down, and there is a problem that the rubbing cloth replacement time cannot be clearly determined. The present invention has been made in view of the above circumstances, and it is possible to accurately check the parallelism between the roller and the table, and it is also possible to adjust the parallelism between the rollers and the table. An object of the present invention is to provide a rubbing device capable of coping with abrasion of hair tips of a cloth and lying down, and moreover, capable of clearly determining a replacement time of a rubbing cloth.

[0004]

In order to achieve the above object, a rubbing device for an alignment film of a liquid crystal display element according to the present invention is provided with a table on which a glass substrate can be placed, and a table above the table and relatively to the table. In a rubbing device for a liquid crystal display element alignment film, which includes a supporting member disposed so as to be vertically movable, and a roller in which a rubbing cloth is wound around the surface of the supporting member so as to be rotatable in a vertical plane, The table or the support member is supported by the piston rods of three electric cylinders arranged so as to be located at the apexes of a triangle in plan view, and each of these three electric cylinders is interposed by a load cell. It is characterized in that it is held and electrically connected to the controller 5 via the load cell amplifier.

[0005]

In the apparatus constructed as described above, when rubbing the alignment film of the liquid crystal display element on the glass substrate, the three electric cylinders are respectively extended and operated on the table while rotating the rollers in a predetermined direction. The glass substrate is brought into contact with the roller. Then, the loads acting on the three electric cylinders at this time are respectively detected by the load cells, and the actually measured load values as the detection results are compared with the preset target load value. Thereby, the parallelism between the roller and the table is checked and adjusted, and further, abrasion of the tips of the rubbing cloth can be dealt with. Further, by repeating the rubbing process in this way, when the rising height of the table to contact the glass substrate with the roller with a predetermined force becomes higher than a predetermined value,
It is time to replace the rubbing cloth.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1 which is a schematic front view, a traveling base 2 is provided on the upper surface of a base 1 so as to be movable in the left and right directions through a sliding mechanism (not shown). A ball screw mechanism 3 penetrating left and right is attached, and both left and right ends of a screw shaft 4 of the ball screw mechanism 3 are rotatably supported by the base 1. In addition, as shown in FIG. 2 which is a plan view, the output shaft of a separately-fixed electric motor 5 with a reducer is connected to the left end of the screw shaft 4 via a power transmission mechanism 6, and The carriage 2 is moved to the left or the right by the normal rotation or the reverse rotation drive, and the electric motor 5 is, as shown in FIG. 1, connected to a controller 7 composed of a microcomputer via a motor driver 8. It is electrically connected.

Further, as shown in FIG. 2, three load cells 9 are located on the traveling platform 2 at respective vertices of an equilateral triangle in plan view, and the two load cells 9 and 9 are located on the left side. In FIG. 1, the three load cells 9 are mounted side by side on the upper and lower sides as shown in FIG.
An upward electric cylinder 12 is mounted. The three load cells 9 are electrically connected to the controller 7 via a load cell amplifier 11, and in the controller 7, the load cells 9 and 9 are preliminarily connected.
When the load signals of the loads acting on the three load cells 9 are input and the target load values regarding the load values are stored, the measured values of the loads are compared with the target load values, respectively. It is possible to check whether or not the parallelism between the upper surface of the roller and the roller 16 described below is a predetermined value.

Further, electric cylinders 12 and 12 are attached to the three load cells 9 and 9, respectively, and a table 13 is installed between the upper ends of the piston rods of the electric cylinders 12 and 12. Electric motor 1 of cylinder 12
Reference numeral 4 is electrically connected to the controller 7 via a motor driver 15, and the portions of the table 13 are moved up or down by the forward rotation or the reverse rotation of the electric motors 14, 14.

As shown in FIG. 1, three rollers 16 extending in the front-rear direction are rotatably arranged in a vertical plane at a position above the traveling base 2 in the center of the base 1. As shown in FIG. 2, these three rollers 16 are arranged in the left-right direction via a support member 17 provided upright on the base 1, and are separately fixedly arranged on the output shaft of an electric motor 18 with a reduction gear. 1, and the electric motor 18 is electrically connected to the controller 7 via a motor driver 20, as shown in FIG. A rubbing cloth (not shown) is formed on the surface of the roller 16.
Is wrapped around.

The device constructed as described above is provided with an electric motor 18
The glass substrate to be rubbed is placed on the table 13 under the condition that the rollers 16 and 16 are rotated in a predetermined direction by driving. Next, the electric motor 5 is driven to rotate in the normal direction to rotate the screw shaft 4 of the ball screw mechanism 3 in the normal direction to move the glass substrate to a position directly below the rollers 16 and 16 by the traveling base 2 and the table 13, and subsequently, the three screws Electric cylinder 12
And the glass substrate on the table 13 is brought into contact with the rollers 16 and 16.

Then, the loads acting on the three electric cylinders 12, 12 are respectively detected by the three load cells 9, 9, and the measured load values as the detection results are input to the controller 7, respectively. Then, it is compared with a preset target load value. Thereby, the parallelism between the roller 16 and the table 13 is checked and adjusted, and the abrasion of the tips of the rubbing cloth is dealt with. Further, by repeating the rubbing process in this way, the glass substrate is moved to the rollers 16, 1
6, the ascending height of the table 13 so as to contact the 6 with a predetermined force
When it becomes higher than the predetermined value, it means that the rubbing cloth replacement time has come.

After the rubbing process is performed in this way, the electric cylinders 12 and 12 are contracted to lower the table 13, and then the electric motor 5 is further driven in the forward direction to further move the traveling table 2, the table 13 and the like to the left. Move to. Then, the glass substrate is taken out from the table 13, and then the electric motor 5 is reversely driven to move the table 13 and the like to the right and return to the original position to complete one cycle. Although the load cell 16 is mounted on the upper surface of the traveling table 2 in the above embodiment, the support member 17 for supporting the roller 16 is used.
It may be attached to the. Although the table 13 is moved up and down, the roller 16 may be moved up and down.

[0013]

As is apparent from the above description, according to the present invention, the table or the supporting member is supported by the three load cells arranged so as to be located at the apexes of the triangle in plan view, and the load cells are supported by the three load cells. Since it is electrically connected to the controller through the load cell amplifier, the loads acting on the three load cells are detected, and the load values are compared with the preset target load value. The parallelism between the roller and the table can be checked accurately and the parallelism between them can be adjusted, and moreover, it is possible to deal with abrasion of the tips of the rubbing cloth and lying down. ,Moreover,
It has an excellent effect that the arrival of the rubbing cloth replacement time can be clearly determined.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention.

FIG. 2 is a schematic plan view with a part notched in FIG.

[Explanation of symbols]

 9 load cell 7 controller 11 load cell amplifier 13 table 17 support member

Claims (1)

[Claims] 1. A table on which a glass substrate can be placed, a supporting member arranged above the table so as to be capable of moving up and down relatively to the table, and mounted on the supporting member so as to be rotatable in a vertical plane. In the rubbing device for a liquid crystal display element alignment film provided with a roller having a rubbing cloth wound around the surface thereof, the table 13 or the supporting member 17 is arranged so as to be located at the apex of a triangle when seen in a plan view. The three electric cylinders 12 are supported by the piston rods, and each of the three electric cylinders 12 is supported by the load cell 9
A rubbing device for an alignment film of a liquid crystal display element, characterized in that the load cell 9 is electrically connected to the controller 7 through a load cell amplifier 11.