KR20010097320A - System for grinding glass edge of liquid crystal display - Google Patents

Abstract

The present invention discloses a glass substrate edge grinder system for a liquid crystal display device. The grinder system of the present invention provides the loading and unloading positions, the first polishing position and the second polishing position of the glass substrate at the front end and the rear end, and switches the transfer direction of the glass substrate between the first polishing position and the second polishing position. A system main body providing a reversing position for the reversal position, a first conveying device which moves between the retracting position and the reversing position, and takes in and transports the glass substrate from the supply device, and a glass substrate mounted on the first conveying device at the retracting position. A first centering device for centering the center, a first polishing device for polishing the end side of the glass substrate conveyed by the first conveying device, and a glass substrate from the first conveying device in the redirection position, and the conveying direction thereof; A turning device for shifting the position, a second conveying device that takes over and transports the glass substrate from the turning device and moves between the turning position and the discharging position, and the second turning position. And a second centering device for centering the glass substrate mounted on the conveying device, and a second polishing device for polishing the side end of the glass substrate conveyed by the second conveying device. According to the present invention, the glass substrate can be transported and polished stably and accurately to produce a high quality glass substrate, and the productivity can be improved. In addition, it can be used universally in accordance with the size of the glass substrate, it is possible to polish a large glass substrate, while the configuration and arrangement is simple and the installation space can be reduced.

Description

Glass substrate edge grinder system for liquid crystal display device {SYSTEM FOR GRINDING GLASS EDGE OF LIQUID CRYSTAL DISPLAY}

The present invention relates to a glass substrate edge grinder system for a liquid crystal display device.

The glass substrate for the liquid crystal display device supplies the glass melted from the dissolution tank to the dissolving molding machine, and the glass which flows down uniformly through the dissolving molding machine is manufactured into a glass substrate by temperature control, and then cut to meet the primary standard. A protective film is coated on the surface of the substrate and transported to a glass substrate processing line for processing. In the glass substrate processing line, the glass substrate is cut again to meet the size of the liquid crystal display device, and the four sides of the glass substrate sharpened by the cutting are polished. After that, a thin film transistor is manufactured.

The prior art glass substrate edge grinder system for a liquid crystal display device has a feed roller conveyor for conveying a glass substrate carried from a peg conveyor by a worker's manual work, and a first glass substrate for continuously conveying the glass substrate with the feed roller conveyor. A pinch belt conveyor and a first polishing apparatus for polishing two sides of a glass substrate conveyed by a first pinch belt conveyor are provided. In addition, a turning device for rotating the glass substrate polished by the first polishing apparatus by 90 degrees, a second pinch belt conveyor for taking over and transporting the glass substrate from the turning device, and a glass substrate conveyed by the second pinch belt conveyor. A second polishing device for polishing the other two sides, a chamfering device for performing chamfering and orientation marking processing, and a discharge roller conveyor for carrying out the glass substrate.

In the glass substrate edge grinder system of the prior art liquid crystal display device configured as described above, the first and second polishing apparatuses are glass substrates in which both ends of the conveying direction are squeezed up and down by the first and second pinch belt conveyors. Since four sides are polished, a transfer error of the glass substrate occurs, so that the polishing and the chamfering defects are frequently generated. In addition, it is difficult to maintain the linearity and orthogonality of the glass substrate, so that the quality cannot be satisfied, and there is a problem that the productivity is greatly reduced. In particular, when the large glass substrates are transferred by the first and second pinch belt conveyors, bending deformation occurs due to weight at the center of the glass substrate, and thus there is a problem in that the large glass substrates are unsuitable. Therefore, there is an urgent need to develop a glass substrate edge grinder system capable of stably feeding and rapidly polishing glass substrates, which are rapidly increasing in size. In addition, the glass substrate edge grinder system of the prior art has a problem that the configuration is complicated, the total length arranged in a line is very long, and occupies a large installation space.

The present invention has been made to solve the various problems of the prior art as described above, an object of the present invention is to provide a glass substrate edge grinder system for a liquid crystal display device capable of manufacturing a high quality glass substrate.

Another object of the present invention is to provide a glass substrate edge grinder system for a liquid crystal display device capable of improving the productivity of the glass substrate.

Still another object of the present invention is to provide a glass substrate edge grinder system for a liquid crystal display device which can be used in general according to the size of the glass substrate.

It is still another object of the present invention to provide an edge grinder system of a glass substrate for a liquid crystal display device capable of stably transporting a large glass substrate.

It is still another object of the present invention to provide a glass substrate edge grinder system for a liquid crystal display device which can be easily configured and arranged and can reduce installation space.

1A and 1B are front and cross-sectional views showing a glass substrate polished by the glass substrate edge grinder system of the present invention;

Figure 2 is a front view showing a glass substrate edge grinder system of the present invention,

3 is a front view showing the arrangement of the system main body, the first and second conveying apparatus, the first and second polishing apparatuses, and the turning apparatus in the glass substrate edge grinder system of the present invention;

4 is a plan view showing the main body of the system in the glass substrate edge grinder system of the present invention,

5 is a front view of FIG. 4;

6 is a plan view showing a first conveying apparatus of the present invention;

7 is a front view of FIG. 6,

8 is a side view of the spray unit shown in Figure 6,

9 is a plan view showing the arrangement of the first centering device in the glass substrate edge grinder system of the present invention;

10 is a plan view showing a first push unit of the first centering device;

11 is a side view of FIG. 10;

12 is a plan view showing a second push unit of the first centering device;

13 is a side view of FIG. 12;

14 is a plan view showing a third push unit of the first centering device;

15 is a side view of FIG. 14,

16 is a plan view showing a fourth push unit of the first centering device;

17 is a side view of FIG. 16;

18 is a front view showing the arrangement of the system main body, the first conveying device, the first centering device, and the first polishing device in the glass substrate edge grinder system of the present invention;

19 is a front view showing a vertical feeder of the first polishing apparatus;

20 is a plan view of FIG. 19,

21 is a front view showing the first and second polishing units of the first polishing apparatus;

FIG. 22 is a plan view of FIG. 21;

23 is a partially enlarged cross-sectional view showing operations of the cooling unit and the dressing unit in the first polishing apparatus;

24 is a front view showing a turning apparatus in the glass substrate edge grinder system of the present invention;

25 is a partially enlarged cross-sectional view of the turning device of FIG. 24;

26 is a plan view showing a chucking unit of the turning device;

27 is a plan view showing a second conveying apparatus of the present invention;

28 is a front view of FIG. 27;

29 is a side view showing the spray unit in Figure 27,

30 is a plan view showing the arrangement of the second centering apparatus in the glass substrate edge grinder system of the present invention;

31 is a plan view showing a first push unit of the second centering device;

32 is a side view of FIG. 31;

33 is a plan view showing a second push unit of the second centering device;

34 is a side view of FIG. 33;

35 is a plan view showing a third push unit of the second centering device;

36 is a side view of FIG. 35;

37 is a plan view showing a fourth push unit of the second centering device;

38 is a side view of FIG. 37;

39 is a front view showing the arrangement of the system main body, the second conveying apparatus, the second centering apparatus, and the second polishing apparatus in the glass substrate edge grinder system of the present invention;

40 is a front view showing a vertical feeder of the second polishing apparatus,

41 is a top view of FIG. 40;

42 is a front view showing the first and second polishing units of the second polishing apparatus;

43 is a top view of FIG. 42;

44 is a partially enlarged cross-sectional view showing operations of the cooling unit and the dressing unit in the second polishing apparatus.

♣ Explanation of symbols for the main parts of the drawing ♣

10: glass substrate 20: feeder

30: automatic transfer device 40: discharge device

50: system main body 52: mounting frame

60: first washing and drying apparatus 70: second washing and drying apparatus

100: first carrier 120: table unit

130: gap adjusting unit 140: guide unit

150: clamping unit 160: first transfer unit

200: first centering device 210: first push unit

230: second push unit 250: third push unit

310: fourth push unit 400: first polishing apparatus

410: first polishing unit 420: first polishing wheel

450: second polishing unit 460: second polishing wheel

500: turning device 540: chucking unit

600: second carrier 620: table unit

630: spacing adjustment unit 640: guide unit

650: clamping unit 660: first transfer unit

700: second centering device 710: first push unit

730: second push unit 750: third push unit

810: fourth push unit 900: second polishing apparatus

910: first polishing unit 920: first polishing wheel

950: second polishing unit 960: second polishing wheel

A feature of the present invention for achieving the above object is to provide the loading and unloading position, the first polishing position and the second polishing position of the glass substrate at the front and rear ends, respectively, between the first polishing position and the second polishing position. A system main body for providing a redirection position for reversing the conveying direction of the glass substrate; A first conveying device that moves between the retracted position and the redirection position, and receives and conveys the glass substrate from the supply device; A first centering device for aligning the center of the glass substrate mounted on the first transport device at the loading position; A first polishing apparatus for polishing the side end of the glass substrate conveyed by the first conveying apparatus at the first polishing position; A turning device which takes in the glass substrate from the first conveying device at the redirection position and changes its conveying direction; A second conveying device which moves between the turning position and the discharging position, and receives and transports the glass substrate from the turning device; A second centering device for centering the glass substrate mounted on the second conveying device at the redirection position; A glass substrate edge grinder system for a liquid crystal display device comprising a second polishing apparatus for polishing a side end of a glass substrate conveyed by a second conveying device at a second polishing position.

Hereinafter, a preferred embodiment of a glass substrate edge grinder system for a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B to 44 are views illustrating a glass substrate edge grinder system for a liquid crystal display according to the present invention.

First, referring to FIGS. 1A and 1B, the glass substrate 10 polished by the glass substrate edge grinder system of the present invention includes two short sides 11 and two long sides 12. In addition, three chamfers 13 and one azimuth display portion 14 are formed at the corners of the polished glass substrate 10. The glass substrate 10 which can be polished by the glass substrate edge grinder system of the present invention has a length of about 450 mm to about 900 mm and a length of about 12 to about 650 mm to about 1100 mm. In addition, a protective film 15 is coated on the upper surface of the glass substrate 10 polished by the glass substrate edge grinder system of the present invention.

As shown in FIG. 2, the glass substrate edge grinder system for a liquid crystal display according to the present invention includes a supply device 20 carrying in the glass substrate 10 and an automatic transfer device 30 carrying out the polished glass substrate 10. ). The supply device 20 has a first belt conveyor 21 and a second belt conveyor 22 for transporting the glass substrate 10, and the automatic transport device 30 is chucking for transporting the glass substrate 10 by chucking. The unit 31 is provided. Then, the discharge device 40 for transferring the glass substrate 10 carried by the drive of the automatic transfer device 30 is provided with a belt conveyor 41.

2 and 3, the system main body 50 is disposed in series between the supply device 20 and the discharge device 40. Four columns 51 are vertically disposed around the center of the upper surface of the system main body 50, and a mounting frame 52 is installed at the top of the column 51. The rear end of the second belt conveyor 22 extending from the rear end of the supply apparatus 20 is introduced into the front end of the system main body 50. The loading position and the first polishing position of the glass substrate 10 are respectively provided at the front end of the system main body 50, and the carrying out position and the second polishing position are respectively provided at the rear end. In addition, a direction change position is provided between the first polishing position and the second polishing position of the system main body 50 to rotate the glass substrate 10 by 90 degrees to change the conveying direction.

In addition, the column 51 of the system main body 50 is provided with a first washing drying apparatus 60 and a second washing drying apparatus 70 for washing and drying the glass substrate 10. The first and second washing and drying apparatuses 60 and 70 are arranged in two rows in the longitudinal direction at the front and rear ends of the mounting frame 52, and the first nozzles 61a and 71a and the second nozzle for spraying water or compressed air. 61b and 71b are provided, respectively. The water supply units 62 and 72 supplying water through any one of the first and second nozzles 61a, 61b, 71a, and 71b of the first and second washing and drying devices 60 and 70 may store water. It consists of the tank 62a, 72a and the circulation pump 62b, 72b which supplies the water of the tank 62a, 72a to any one of the 1st and 2nd nozzles 61a, 61b, 71a, 71b. The other of the first and second nozzles 61a, 61b, 71a, 71b of the first and second washing and drying apparatuses 60, 70 is operatively connected to a general compressed air supply unit. Then, a bucket 80 for collecting water is installed on the upper part of the system main body 50.

2 to 5, a pair of guide rails 90 are attached to the upper surface of the system main body 50 side by side along the conveying direction of the glass substrate 10, and the system main body is attached to the guide rail 90. The first conveying device 100 is installed to move between the carry-in position and the redirection position of the 50.

As shown in FIGS. 6 to 8, the first transport apparatus 100 includes a base plate 110 and a table unit 120 that are transported along the guide rail 90.

The table unit 120 includes a first fixing stand 121 and a second fixing stand 122 which are fixed in parallel to each other along the transport direction of the glass substrate 10 at the center of the upper surface of the base plate 110, and the first and The first movable stand 123 and the second movable stand 124 are arranged side by side so as to adjust an interval in the vertical direction on both sides of the second fixed stands 121 and 122. The first and second fixed stands 121 and 122 and the first and second movable stands 123 and 124 have a plurality of intake holes 125 for vacuum sucking the glass substrate 10 by the suction force of a general vacuum pump. Each of which is formed, the upper surface is attached with a sponge pad 126 to prevent damage to the glass substrate 10 and to assist in vacuum adsorption. In the glass substrate edge grinder system of the present invention, a second belt conveyor 22 of the supply device 20 is positioned between the first and second fixed stands 121 and 122 of the first transport device 100.

In addition, the first conveying apparatus 100 adjusts a gap in which the interval between the first and second movable stands 123 and 124 can be adjusted with respect to the first and second fixed stands 121 and 122 of the table unit 120. The unit 130 is provided. The gap adjusting unit 130 has a micrometer head 131 and an adjustment shaft 132 which is rotated by the adjustment of the micrometer head 131. The adjusting shaft 132 includes a connecting shaft portion 132a penetrating through the first and second fixing stands 121 and 122, a left screw shaft portion 132b and a right screw shaft portion 132c connected to both ends of the connecting shaft portion 132a. It consists of. The left screw feed nut 133 and the right screw feed nut 134 which are fixed to the lower surfaces of the first and second movable stands 123 and 124 on the left screw shaft portion 132b and the right screw shaft portion 132c of the adjustment shaft 132. Are fastened respectively. When the operator rotates the micrometer head 131 of the gap adjusting unit 130 by manual operation, the left screw feed nut 133 along the left screw shaft portion 132b and the right screw shaft portion 132c of the adjustment shaft 132 and The right screw feed nut 134 is helically moved, and the first and second movable stands 123 and 124 are linearly moved with respect to the first and second fixed stands 121 and 122 to adjust the spacing.

The first transport apparatus 100 is disposed on both ends of the lower surfaces of the first and second movable stands 123 and 124 to guide the guide unit 140 to assist the linear movement of the first and second movable stands 123 and 124. Equipped. The guide unit 140 is fixed to the guide rail 141 fixed to the upper surface of the base plate 110 and the lower surface of the first and second movable stands 123 and 124 while linearly moving along the guide rail 141. Consisting of a slide 142. The first and second movable stands 123 and 124 of the first transport apparatus 100 are constrained by the clamping unit 150. The clamping unit 150 is fixed to the outer side of the first and second movable stand (123, 124) fixed block 151, the fixing block 151 and the upper surface of the base plate 110 in a position corresponding to each other A guide block 152 fixed in the longitudinal direction and having a slot 152a formed therein, and a locking nut 153 which is moved along the slot 152a of the guide block 152 and is mounted to prevent separation from the slot 152b; And a clamp lever 154 that is fastened to the locking nut 153 through the fixing block 151. A scale 155 capable of measuring the positions of the first and second movable stands 123 and 124 is mounted at a proximal position of the fixed block 151. In the figure, it is shown that four guide units 140 and four clamping units 150 are installed at the corners of the base plate 110, respectively, but their installation numbers and positions can be changed as necessary. .

As shown in FIGS. 4 to 7, the first transport apparatus 100 is moved between the loading position and the turning position of the system main body 50 along the guide rail 90 by the first transfer unit 160. do. The first conveying unit 160 is a feed screw shaft 161 disposed in parallel with the guide rail 90 along the conveying direction of the glass substrate 10 from the front end to the center of the system main body 50, the feed screw The feed motor 162 for rotating the shaft 161, and the feed nut 163 is spirally moved along the feed screw shaft 161 and fixed to the bottom surface of the base plate 110.

A spray unit 170 is installed at the rear end of the base plate 110 to remove foreign substances from the glass substrate 10. The spray unit 170 is arranged in the longitudinal direction of the base plate 110 to spray water. It has a nozzle 171. The first and second stoppers 180a and 180b for restraining the conveyance of the first conveying device 100 and the position of the first conveying device 100 are sensed at the carrying position and the redirection position of the system main body 50. First and second sensors 181a and 181b for controlling the driving of the transfer motor 162 are mounted.

3, 6 and 9 and 18, the glass substrate edge grinder system of the present invention is taken over from the supply device 20 at the loading position of the system main body 50 of the first transport device 100 A first centering device 200 for centering the glass substrate 10 seated on the table unit 120 is provided.

As shown in FIGS. 6 and 9 to 11, the first centering device 200 is installed at the front end of the base plate 110 of the first transporting device 100 and supports the front end of the glass substrate 10 in the transport direction. There is a pair of first push unit 210 to push toward the rear end, the first push unit 210 is spaced apart a predetermined distance so as to support two points of the glass substrate (10). The first push unit 210 has a bed 211 is fixed to the base plate 110 of the first conveying apparatus 100, the push cylinder having a pair of cylinder rods (212a) on the upper surface of the bed 211 ( 212) is mounted. The push cylinder 212 is fixed to the bed 211 by the fastening of the bolt 213, the stroke start of the cylinder rod 212a of the push cylinder 212 is sensed by the sensor 214.

In addition, the elevating adjustment unit 220 is mounted to the cylinder rod 212a of the push cylinder 212 by the bracket 215. The elevating adjustment unit 220 is mounted on a guide rail 221 mounted vertically on one side of the bracket 215, a slide 222 linearly moving along the guide rail 221, and a lower end of the guide rail 221. And an adjusting screw shaft 224 fixed to the slide 222 through a screw hole 223a of the adjusting block 223 and an adjusting block 223 having a screw hole 223a. On one side of the guide rail 221, the push roller 225 for supporting the front end of the transport direction of the glass substrate 10 is mounted so as to rotate about the post (225a). When adjusting the adjustment screw shaft 224 of the elevating adjustment unit 220, the slide 222 is linearly moved up and down along the guide rail 221, and the push roller 225 is also elevated. Therefore, since the contact portion of the push roller 225 in contact with the glass substrate 10 is changed by the operation of the lifting adjustment unit 220, the life of the push roller 225 is extended.

As shown in FIGS. 6, 9, 12, and 13, the first centering apparatus 200 supports a rear end of the glass substrate 10 in the conveying direction to push against the first push unit 210. 2 is provided with a push unit 230, the second push unit 230 is installed on the rear end of the base plate 110 of the first transport apparatus 100 to face the first push unit 210. The second push unit 230 has a bed 231 fixed to the base plate 110 of the first conveying device 100, the upper surface of the bed 231 in the conveying direction of the glass substrate 10 guide rail ( 232 is mounted, and a slot 232a is formed at the center of the guide rail 232. A slot 232b of the guide rail 232 is mounted with a slide 233 which linearly moves, and a push cylinder 234 having a pair of cylinder rods 234a is mounted on an upper surface of the slide 233. In addition, the locking nut 235 is mounted to the slot 232b of the guide rail 232 to prevent separation from the slot 232a, and the bolt 236 penetrates the slide 233 to the locking nut 235. Is fastened. The slide 233 is fixed to the guide rail 232 by fastening the bolt 236.

The elevating adjustment unit 240 is mounted to the cylinder rod 234a of the push cylinder 234 by the bracket 237. The elevating adjustment unit 240 is mounted on a guide rail 241 vertically mounted on one side of the bracket 237, a slide 242 linearly moving along the guide rail 241, and a lower end of the guide rail 241. And an adjusting block 243 having a screw hole 243a and an adjusting screw shaft 244 fixed to the slide 242 via the screw hole 243a of the adjusting block 243. On one side of the guide rail 241, the push roller 245 for supporting the front end of the transport direction of the glass substrate 10 is mounted so as to rotate around the post 245a.

6, 9, 14 to 17, the first centering device 200 is installed in the carry-in position of the system main body 50 to support both ends of the transfer direction of the glass substrate 10 to the center A pair of the third push unit 250 and the fourth push unit 310 to cooperate to push toward each other toward each other, each of the third and fourth push unit 250, 310 is disposed facing each other. The third and fourth push units 250 and 310 have base plates 251 and 311 attached to the top surface of the system main body 50, and a pair of guide rails 252 on the top surfaces of the base plates 251 and 311. 312 are mounted side by side in the longitudinal direction at predetermined intervals, and slides 253 and 313 are linearly mounted on the guide rails 252 and 312. Tables 254, 314 are attached to the upper surfaces of the slides 253, 313, and a pair of push cylinders 255, 315 having a pair of cylinder rods 255a, 315a are provided on both sides of the upper surfaces of the tables 254, 314. It is mounted vertically and vertically, respectively.

Lifting adjustment units 260 and 320 are mounted to the front ends of the cylinder rods 255a and 315a of the push cylinders 255 and 315 by the brackets 256 and 316. The elevating adjustment units 260 and 320 are guide rails 261 and 321 mounted vertically to one side of the brackets 256 and 316, and slides 262 and 322 linearly moving along the guide rails 261 and 321. And slides through the adjusting blocks 263 and 323 mounted on the lower ends of the guide rails 261 and 321 and having the screw holes 263a and 323a, and through the screw holes 263a and 323a of the adjusting blocks 263 and 323. And adjusting screw shafts 264 and 324 fixed to 262 and 322. On one side of the guide rails 261 and 321, a pair of push rollers 265 and 325 supporting the front end of the transport direction of the glass substrate 10 are mounted to rotate about the posts 265a and 325a.

The rear end of the push cylinder (255, 315) is provided with a sensing unit (270, 330) for detecting the stroke of the cylinder rod (255a, 315a). The sensing units 270 and 330 are sensing bars 271 and 331 mounted on the rear ends of the cylinder rods 255a and 315a, and a table 254 to detect the stroke start and stroke end of the sensing bars 271 and 331. And start sensors 273a and 333a and end sensors 273b and 333b spaced apart from each other at predetermined intervals on the brackets 272 and 332 attached to one side of the 314. When the cylinder rods 255a and 315a are advanced back and forth by driving the push cylinders 255 and 315, the stroke start and stroke end of the sensing bars 271 and 331 are started with the start sensors 273a and 333a and the end sensor 273b, 333b). The driving of the push cylinders 255 and 315 is controlled by the detection of the start sensors 273a and 333a and the end sensors 273b and 333b. As a result, the push rollers 265 and 325 are connected to the glass substrate 10. The contact position is precisely controlled.

The tables 254 and 314 of the third and fourth push units 250 and 310 are linearly moved along the guide rails 261 and 321 by the adjustment of the position adjusting units 280 and 340. The position adjusting units 280 and 340 include micrometer heads 281 and 341, adjustment screw shafts 282 and 342 which are rotated by the adjustment of the micrometer heads 281 and 341, and adjustment screw shafts 282 and 340. It is composed of a feed nut (283, 343) which is spirally moved along the 342 and fixed to the lower surface of the table (254, 314). When the adjustment screw shafts 282, 342 are rotated by the adjustment of the micrometer heads 281, 341, the feed nuts 283, 343 are spirally moved along the adjustment screw shafts 282, 342, and the slides 262, By parallel movement with the 322, the tables 254 and 314 are linearly moved along the guide rails 261 and 321. The third and fourth push units 250 and 310 may be easily used for centering the glass substrates 10 having different sizes by adjusting the positions of the tables 254 and 314. Scales 284 and 344 are mounted on one end of the upper surface of the base plates 251 and 311 so as to be parallel with the guide rails 261 and 321 on one side, and the scales 284 and 344 are attached to the base plates 251 and 311 by the scales 284 and 344. The positions of the tables 254 and 314 for the measurement are measured.

The tables 254 and 314 of the third and fourth push units 250 and 310 are fixed to the base plates 251 and 311 by the fixing units 290 and 350. The fixing units 290 and 350 are mounted on the upper surfaces of the base plates 251 and 311 so as to be parallel to the guide rails 261 and 321 on one side, and the fixing blocks 291 and 351 to which the slots 291a and 351a are formed. The locking nuts 292 and 352 move along the slots 291a and 351a of the fixed blocks 291 and 351 and are mounted so as to prevent their departure from the slots 291a and 351a, and through the tables 254 and 314. And clamp levers 293 and 353 fastened to the locking nuts 292 and 352. Accordingly, the tables 254 and 314 are fixed to the base plates 251 and 311 by fastening the locking nuts 292 and 352 to the clamp levers 293 and 353.

14 and 15, the third push unit 250 includes a stroke end adjusting unit 300 for finely adjusting the stroke end of the cylinder rod 255a. The stroke end adjustment unit 300 contacts the micrometer head 301 mounted through the center of the sensing bar 271 and the push cylinder to contact the micrometer head 301 to restrain the stroke end of the sensing bar 271. It consists of the stopper 302 attached to the rear end of 255. In FIG. The stroke end of the sensing bar 271 is measured by the dial indicator 303 mounted on the upper surface of the table 254. The position where the micrometer head 301 of the stroke end adjustment unit 300 is caught by the stopper 302 is finely adjusted by the micrometer head 301, and in parallel with this, the stroke end of the sensing bar 271 is dialed indicator ( The position error of the stroke end of the cylinder rod 255a and the sensing bar 271 which are measured and measured by 303 and advanced back and forth by the drive of the push cylinder 255 are adjusted. By adjusting the stroke end adjustment unit 300 as described above, the reliability of the third push unit 250 is ensured.

As shown in FIGS. 16 and 17, the fourth push unit 310 includes a damper 360 between the bracket 316 and the lift adjusting unit 320 mounted at the tip of the cylinder rod 315a. The damper 360 is mounted on a pair of guide pins 361 and the outer circumference of the guide pins 361 so as to allow the slide 322 of the elevating adjustment unit 320 to linearly move relative to the bracket 316. And a spring 362 that biases the slide 322 outward. The spring 362 of the damper 360 absorbs the reaction force generated when the push roller 325 of the fourth push unit 310 pushes the side end of the glass substrate 10 by elastic deformation. In addition, the slide 322 of the elevating adjustment unit 320 of the fourth push unit 310 is linearly moved along the guide pin 361 due to the elastic deformation of the spring 362, and thus the third push unit 250 The position at which the push roller 325 pushes the side end of the glass substrate 10 becomes a reference for centering.

2, 4, and 18, the glass substrate edge grinder system of the present invention is characterized in that the glass substrate 10 is conveyed by the first conveying apparatus 100 at the first polishing position of the system main body 50. The 1st grinding | polishing apparatus 400 which grinds the both ends of a conveyance direction, for example, the two short sides 11 is provided.

As shown in FIGS. 19 and 20, the first polishing apparatus 400 has a vertical carriage 401 installed in the longitudinal direction at the front end of the mounting frame 52, and the first polishing unit (401) is provided in the longitudinal carriage 401. The 410 and the second polishing unit 450 are spaced apart from each other at a predetermined interval. Each of the first and second polishing units 410 and 450 has carriages 413 and 453 which linearly move along the feed screw shafts 412 and 422 which are rotated by the drive of the transfer motors 411 and 451. Guide rails 414 and 454 are vertically mounted to one side of 413 and 453, and slides 415 and 455 for linear movement are mounted to the guide rails 414 and 454. The slides 415 and 455 are constrained with respect to the carriages 413 and 453 by the fastening of the bolts 415a and 455a.

The carriages 413 and 453 are constrained by the first stoppers 416a and 456a and the second stoppers 416b and 456b mounted close to both ends of the feed screw shafts 412 and 422. 2 The first sensors 417a and 457a and the second sensors 417b and 457b that sense the positions of the carriages 413 and 453 at positions close to the stoppers 417a and 457a to control the driving of the transfer motors 411 and 451. Are mounted respectively.

Spindle motors 418 and 458 are installed at one side of the slides 415 and 455, and the first and second polishing wheels 420 and 460 which are in rotational motion are connected to the spindle motors 418 and 458. Five polishing grooves 421 and 561 for polishing the glass substrate 10 along the circumferential direction are formed on the outer circumference of the first and second polishing wheels 420 and 460 at equal intervals. The first and second abrasive wheels 420 and 460 are made of diamond, and are rotated by the driving of the spindle motors 418 and 458 to enter the glass substrates 421 and 561 into one of the abrasive grooves 421 and 561. The short side 11 of 10) is polished. The outer sides of the first and second polishing wheels 420 and 460 are surrounded by the covers 422 and 562.

In addition, the slides 415 and 455 of the first and second polishing units 410 and 450 are linearly moved up and down along the guide rails 414 and 454 by the elevating adjustment units 430 and 470, and thus the glass The polishing positions of the first and second polishing wheels 420 and 460 relative to the substrate 10 are finely adjusted. The elevating adjustment units 430 and 470 include micrometer heads 431 and 471, adjustment screw shafts 432 and 472 rotated by adjustment of the micrometer heads 431 and 471, and slides 415 and 455. It is fixed to one side of and consists of feed nuts (433, 473) spirally moving along the adjustment screw shaft (432, 472). When the operator adjusts the micrometer heads 431 and 471 of the elevating adjustment units 430 and 470 to rotate the adjustment screw shafts 432 and 472, the feed nuts 433 and 473 are spirally moved to guide rails 414, The slides 415 and 455 are elevated along the 454 and the positions of the polishing grooves 421 and 561 with respect to the glass substrate 10 are increased by the lifting of the first and second abrasive wheels 420 and 460 in parallel. Fine-tuned. As a result, the lifespan of the first and second polishing wheels 420 and 460 is extended. The polishing positions of the first and second polishing wheels 420 and 460 by the adjustment of the micrometer heads 431 and 471 are measured by the dial indicators 434 and 474.

2, 22 and 23, one side of the cover (422, 562) surrounding the first and second polishing wheels (420, 460) of the first and second polishing units (410, 450) Cooling units 440 and 480 for cooling the first and second polishing wheels 420 and 460 are installed. The nozzles 441 and 481 of the cooling units 440 and 480 spray the cooling water at an angle of about 45 degrees from the upper direction with respect to the polishing grooves 421 and 561 of the first and second polishing wheels 420 and 460. Therefore, deterioration of the first and second polishing wheels 420 and 460 and burnout of the glass substrate 10 are prevented by the injection of the cooling water through the nozzles 441 and 480 of the cooling units 440 and 480. In addition, nozzles 546 and 486 of the dressing units 445 and 485 are disposed in proximity to one side of the first and second polishing wheels 420 and 460 to periodically inject compressed air into the polishing grooves 421 and 561. do. Compressed air that is injected through the nozzles 546 and 486 of the dressing units 445 and 485 removes the glazing and sharpening of the polishing grooves 421 and 561 by the glass chips.

2, 3, and 24 to 26, the glass substrate edge grinder system of the present invention is disposed at the turning position of the system main body 50 and has undergone the polishing process of the first polishing apparatus 400. A turning device 500 for changing the direction of the substrate 10 is provided. The turning device 500 has a base plate 501 attached to the center of the upper surface of the mounting frame 52, and in the center of the base plate 501 to the drive shaft 511 and the gear train 512 of the index motor 510. The operating shaft 520 that is operatively connected and rotated is mounted vertically. The drive shaft 511 and the gear train 512 are wrapped by the casing 513. In addition, the operating shaft 520 is operatively connected by the cylinder rod 530a of the lifting cylinder 530 and the interposition of the joint plate 531 to be elevated, and the joint plate 531 is along the guide rail 632. It moves up and down linearly.

In addition, a chucking unit 540 for chucking the glass substrate 10 is attached to the lower end of the operating shaft 520. The turning plate 541 of the chucking unit 540 is fixed to the lower end of the drive shaft 520, and the center of the lower surface of the turning play 541 is vacuum-adsorbed to the center of the glass substrate 10 by the interposition of the adapter 542. The main vacuum pad 543 is mounted. Four arms 544 having slots 544a are radially extended at the corners of the turning plate 541, respectively, and a pair of subs are arranged in the slots 544a of the arms 544 so as to be mutually adjustable. The vacuum pad 545 is mounted. If the distance between the sub-vacuum pads 545 is adjusted based on the main vacuum pads 543 along the slots 544a of the arm 544, the glass is formed by the cooperation of the main vacuum pads 543 and the sub-vacuum pads 545. Not only the substrate 10 is stably chucked, but also the chucking of the glass substrates 10 having different sizes is possible.

2, 3 and 27 to 29, the guide rail 90 of the system main body 50 is provided with a second conveying device 600 for moving between the direction change position and the discharge position. 27 to 29 are identical in configuration and operation to the first transportation device 100 described with reference to FIGS. 6 to 8, and have the same configuration and operation as the first transportation device 100. Detailed description of the second transport device 600 will be omitted. The second conveying device 600 moves between the redirection position and the discharging position of the system main body 50 along the guide rail 90 by the second conveying unit 760. In addition, the spray unit 170 of the second transport device 600 is installed at the tip of the base plate 710 to remove foreign substances from the glass substrate 10.

2, 3, 30 to 39, the glass substrate edge grinder system of the present invention is taken over from the supply device 20 at the loading position of the system main body 50 of the second conveying device 600. A second centering device 700 for centering the glass substrate 10 seated on the table unit 720 is provided. The first to fourth push units 710, 730, 750, and 810 of the second centering device 700 shown in FIGS. 30 to 38 are the first to the first centering devices 200 described with reference to FIGS. 9 to 17. The configuration and action are the same as the fourth push unit (210, 230, 250, 310), the configuration and action is the same as the first to fourth push unit (210, 230, 250, 310) of the first centering device 200 Detailed description of the first to fourth push units 710, 730, 750, and 810 of the same second centering device 700 will be omitted.

As shown in FIGS. 3, 27, and 28, the second centering device 700 having the above configuration has the first push unit 710 at the rear end of the base plate 110 of the second conveying device 100. It is installed and supports the rear end in the conveying direction of the glass substrate 10. The second push unit 730 is installed at the front end of the base plate 710 of the second transport device 600 and supports the front end of the glass substrate 10 in the transport direction. The third push unit 750 and the fourth push unit 810 of the second centering device 700 are installed at the direction change position of the system main body 50 to support both ends of the glass substrate 10 in the transfer direction. .

2, 3, and 39, the glass substrate edge grinder system of the present invention is characterized in that the glass substrate 10 is conveyed by the second conveying apparatus 700 at the second polishing position of the system main body 50. The 2nd grinding | polishing apparatus 900 which performs the grinding | polishing process of the both sides 11, for example, two long sides of a conveyance direction is provided. 39 to 44 are identical in structure and operation to the first polishing apparatus 400 described with reference to FIGS. 18 to 23, and have the same structure and operation as the first polishing apparatus 400. Detailed description of the second polishing apparatus 900 will be omitted.

The operation of the glass substrate edge grinder system for a liquid crystal display device according to the present invention will now be described.

As shown in FIG. 2, the operator uses the first and second belt conveyors 21 and 22 of the feeder 20 to turn the protective film 15 of the glass substrate 10 upward and the long side 12. It is mounted so as to face the feeding direction.

6 to 8, after being mounted on the table unit 120 of the first transport apparatus 100, the first to fourth push units 210, 230, and 250 of the first centering apparatus 200. Each push cylinder (212, 234, 255, 315) is driven to advance the cylinder rod (212a, 234a, 255a, 315a). Push rollers 225, 245, 265, and 325 push the short sides 11 and long sides 12 of the glass substrate 10 from all directions toward the center due to the advance of the cylinder rods 212a, 234a, 255a, and 315a. Guess At this time, since the stroke start of the cylinder rod 212a of the first push unit 210 is controlled by the detection of the sensor 214, the reference of the centering of the long side 12 of the glass substrate 10 is the first push unit. (210).

14 to 17, the spring 471 of the damper 470 provided between the bracket 316 and the elevating adjustment unit 320 of the fourth push unit 310 is push roller (d) by elastic deformation. 325 absorbs the reaction force generated when pushing the side end of the glass substrate (10). In addition, the slide 322 of the elevating adjustment unit 320 is linearly moved along the guide pin 471 due to the elastic deformation of the spring 471, whereby the push roller 325 of the third push unit 250 is The position pushing the side end of the glass substrate 10 is a reference of the centering of the short side 10 of the glass substrate 10. When the glass substrate 10 is centered by the operation of the first centering apparatus 200, the first and second fixed stands 121 and 122 and the first and second movable stands of the first transport apparatus 100 are aligned. Air is inhaled through the intake holes 125 formed in the respective 123 and 124, and the glass substrate 10 is vacuum-adsorbed to the sponge pad 126. When the glass substrate 10 is vacuum-adsorbed and fixed to the sponge pad 126, the cylinder rods 212a, 234a, 255a, and 315a are retracted by the push cylinders 212, 234, 255, and 315, and the push rollers are retracted. 225, 245, 265, and 325 are spaced apart from the glass substrate 10.

4 and 5, when the feed motor 162 of the first transfer unit 160 is driven to rotate the feed screw shaft 161, the feed nut 163 is along the feed screw shaft 161. Spiral motion to transfer the first conveying device 100 from the loading position of the system main body 50 to the first polishing position.

18 to 23, when the first transport device 100 reaches the first polishing position of the system main body 50, the leading edge of the glass substrate 10 in the feed direction is first polisher 400. Contact with the polishing grooves 421 and 561 of the first and second polishing wheels 420 and 460 rotated by the driving of the spindle motors 418 and 458, respectively. Then, the transfer motors 411 and 451 of the first and second polishing units 410 and 450 are driven so that the first and second polishing wheels 420 and 460 are formed at both ends of the glass substrate 10, that is, at two short sides. Carriages 413 and 453 are transferred toward both ends of the longitudinal transfer table 401 to be in contact with (11). Accordingly, the chamfer 13 is formed at the leading edge of the glass substrate 10 in the feed direction edge of the glass substrate 10 by polishing the first and second polishing wheels 420 and 460, and the two short sides 11 are polished, respectively. The nozzles 441 and 481 of the cooling units 440 and 480 spray cooling water into the polishing grooves 421 and 561 of the first and second polishing units 410 and 450, respectively. The degradation of the 460 and the burnout of the glass substrate 10 are prevented. The nozzles 546 and 486 of the dressing units 445 and 485 periodically spray compressed air into the polishing grooves 421 and 561 of the first and second polishing units 410 and 450 so that the polishing grooves are formed by glass chips. 421, 561) to prevent blindness and dullness. In addition, the nozzle 171 of the spray unit 170 installed at the rear end of the first transport apparatus 100 sprays water onto the glass substrate 10 to remove glass powder generated by polishing.

In the polishing operation of the first and second polishing wheels 420 and 460, the second first and second polishing wheels (for the feeding speed of the glass substrate 10 mounted on the first conveying device 100 and conveyed) When the feed speeds of the 420 and 460 are adjusted differently, as shown in FIG. 1, the chamfer 13 and the orientation display part 14 are formed at the leading edge of the glass substrate 10 in the feed direction. The azimuth display portion 14 of the glass substrate 10 is formed by the relatively slow conveying speed of the first and second abrasive wheels 420 and 460. The orientation display unit 14 may be formed at the trailing edge of the glass substrate 10 in the conveying direction. On the other hand, when the first and second abrasive wheels 420 and 460 are close to the trailing edges of the glass substrate 10 in the feed direction, the first and second abrasive wheels 420 and 460 may be connected to the transfer motors 411 and 451. It is conveyed toward the center of the vertical feed stand 401 by drive. Therefore, the chamfer 13 is formed in the trailing edge of the glass substrate 10.

When the first conveying device 100 passes the first polishing position of the system main body 50 by driving the conveying motor 762 of the first conveying unit 160, the first of the first washing and drying device 60 is applied. And cleaning the foreign matter by spraying water on the glass substrate 10 through one of the second nozzles 61a and 61b, and then spraying compressed air through the other of the first and second nozzles 61a and 61b. The organic substrate 10 is dried.

Referring to FIGS. 4 and 5 again, when the first conveying device 100 reaches the redirection position past the first polishing position of the system main body 50, the base plate 110 of the first conveying device 100 Is caught by the second stopper 180b, and the driving of the transfer motor 162 is stopped by the control of the second sensor 181b that detects the position of the first transport apparatus 100.

2, 3, 18, 24 to 26, after the transfer of the first conveying device 100 is stopped in the turning position of the system main body 50, the turning device 500 When the lifting cylinder 530 is driven and the cylinder rod 530a is advanced, the operation shaft 520 and the turning plate 541 are lowered in parallel. After the turning plate 541 is lowered, the upper surface of the glass substrate 10 is vacuum-adsorbed by the main vacuum pad 543 and the sub-vacuum pad 545, and the table unit 120 of the first transport apparatus 100 is vacuum-absorbed. The vacuum suction force of the glass substrate 10 is removed through the formed intake hole 125. In this state, when the lifting cylinder 530 of the turning device 500 is driven and the cylinder rod 530a is retracted, the operation shaft 520 and the turning plate 541 are raised to the initial position in parallel, and the main vacuum pad. The glass substrate 10 vacuum-absorbed by the 543 and the sub-vacuum pad 545 is also lifted from the table unit 120 of the first conveying apparatus 100. Subsequently, the driving shaft 520 is rotated by 90 degrees by the driving of the index motor 510, thereby chucking the chucking unit 540 so that the glass substrate 10 in which the long side 12 faces the conveying direction is removed. The short side 11 faces the conveyance direction.

Referring again to FIGS. 4 and 5, the transfer motor 162 of the first transfer unit 160 is driven while the glass substrate 10 is lifted by the turning device 500 to drive the first conveyance. The device 100 is returned from the turning position of the main system body 50 to the loading position. When the first conveying apparatus 100 reaches the loading position of the system main body 50, the base plate 110 of the first conveying apparatus 100 is caught by the first stopper 180a and the first conveying apparatus 100 is provided. The driving of the motor 162 is stopped by the control of the first sensor 181a that detects the position of. After the return of the first conveying apparatus 100, the second conveying apparatus 600 is moved from the carrying out position of the system main body 50 to the redirection position by driving the conveying motor 762 of the second conveying unit 760. Transferred. When the second conveying device 600 reaches the redirection position of the system main body 50, the base plate 710 of the second conveying device 600 is caught by the first stopper 780a, and the first conveying device ( The driving of the transfer motor 762 is stopped by the control of the first sensor 781a that detects the position of 600.

As described above, after the second conveying device 600 is transferred to the direction change position of the system main body 50, the lifting cylinder 530 of the turning device 500 is driven to move the cylinder rod 530a. After the operation shaft 520 and the turning plate 541 are lowered in parallel due to the advance of the cylinder rod 530a, the chucking unit 540 is chucked to the main vacuum pad 543 and the sub vacuum pad 545. The glass substrate 10 is mounted on the table unit 720 of the second transportation device 600 by removing the vacuum suction force. When the lifting cylinder 530 of the turning device 500 is driven to retract the cylinder rod 530a, the chucking unit 540 is raised to return to the initial position.

Referring to FIGS. 27 to 29, the short side 11 of the glass substrate 10 is mounted on the table unit 720 of the second conveying device 600 by the turning device 500 so as to face the conveying direction. Afterwards, the first to fourth push units 710 of the second centering apparatus 700 are operated in the same manner as the first to fourth push units 210, 230, 250, 310 of the first centering apparatus 200. Push cylinders 812, 834, 855, 915 of each of 730, 750, and 810 are driven to advance the cylinder rods 812a, 834a, 855a, 915a. Push rollers 825, 845, 865, and 825 push the short side 11 and long side 12 of the glass substrate 10 from all directions toward the center due to the advance of the cylinder rods 812a, 834a, 855a, and 915a. Guess When the center of the glass substrate 10 is aligned by the operation of the second centering device 700, the air is inhaled through the intake hole 725 formed in the table unit 720 of the second conveying device 600. The glass substrate 10 is vacuum-adsorbed to the sponge pad 726. When the glass substrate 10 is vacuum-adsorbed and fixed to the sponge pad 726, the cylinder rods 812a, 834a, 855a, and 915a are retracted by the push cylinders 812, 834, 855, and 915, and the push rollers are retracted. 825, 845, 865, and 925 are spaced apart from the glass substrate 10.

4, 5, and 39 to 44, when the feed motor 762 of the second transfer unit 760 is driven and the feed screw shaft 761 is rotated, the feed nut 763 is fed to the feed screw shaft. Spiral motion along 761 transfers the second conveying device 600 from the turning position of the system main body 50 to the second polishing position. When the second conveying device 600 reaches the second polishing position of the system main body 50, the leading edge of the glass substrate 10 in the feed direction is determined by the spindle motors 918 and 958 of the second polishing device 900. The polishing grooves 921 and 961 of the first and second polishing wheels 920 and 960 rotated by driving are respectively contacted. The first and second polishing wheels 920 and 960 of the second polishing apparatus 900 may operate in the same manner as the first and second polishing units 410 and 450 of the first polishing apparatus 400. Polish the two long sides 12). During the polishing operation of the second polishing apparatus 900, the nozzles 941 and 981 of the cooling units 940 and 980 spray cooling water, and the nozzles 946 and 986 of the dressing units 945 and 985 periodically compress the compressed air. Spray into. In addition, the nozzle 771 of the spray unit 770 installed at the tip of the second transportation device 600 sprays water onto the glass substrate 10 to remove glass powder generated by polishing.

The first of the second cleaning and drying apparatus 70 when the second conveying device 600 passes the second polishing position of the system main body 50 by driving the conveying motor 762 of the second conveying unit 760. The second nozzles 71a and 71b spray water or compressed air in the same operation as the first washing and drying apparatus 60 to clean and dry the glass substrate 10. When the second conveying device 600 reaches the carrying out position beyond the second polishing position of the system main body 50, the base plate 710 of the second conveying device 600 is caught by the second stopper 780b, The driving of the transfer motor 762 is stopped by the control of the second sensor 781b that detects the position of the second transport device 600.

As shown in FIG. 2, after the second polishing apparatus 900 is transferred to the carrying out position of the system main body 50, the chucking unit 31 of the automatic transfer apparatus 30 is operated to operate the glass substrate 10. The upper surface of the vacuum suction is performed, and the vacuum suction force of the glass substrate 10 is removed through the intake hole 725 formed in the table unit 720 of the second transportation device 600. Then, the automatic transfer device 30 takes over the glass substrate 10 to the belt conveyor 41 of the discharge device 40 to discharge.

The above embodiments are merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited to the illustrated embodiments and may be appropriately changed within the claims. For example, the shape and structure of each component shown in the embodiment of the present invention can be modified.

As described above, according to the glass substrate edge grinder system for liquid crystal display device according to the present invention, the glass substrate can be transported and polished stably and accurately, thereby producing a high quality glass substrate, and improving productivity. It works. In addition, it can be used universally in accordance with the size of the glass substrate, it is possible to polish a large glass substrate, yet the configuration and arrangement is simple and has the effect of reducing the installation space.

Claims (5)

At the front end and the rear end, the loading and unloading positions, the first polishing position and the second polishing position of the glass substrate are provided, respectively, and the direction switching position for switching the transfer direction of the glass substrate between the first polishing position and the second polishing position. The system provides a main body; A first conveying device that moves between the retracted position and the redirection position and receives and transports a glass substrate from the supply device; A first centering device for centering a glass substrate mounted on the first transport device at the loading position; A first polishing device for polishing the side end of the glass substrate conveyed by the first conveying device at the first polishing position; A turning device which takes in a glass substrate from the first conveying device in the redirection position and changes its conveying direction; A second conveying device which moves between the redirection position and the discharging position, and takes in and transports a glass substrate from the turning device; A second centering device for centering the glass substrate mounted on the second conveying device at the redirection position; And a second polishing apparatus for polishing the side end of the glass substrate conveyed by the second conveying device at the second polishing position. The method of claim 1, wherein each of the first and second conveying apparatus, A base plate conveyed along a guide rail attached to an upper surface of the system main body; The first and second fixing stands fixed in parallel with each other along the conveying direction of the glass substrate in the center of the upper surface of the base plate, and arranged side by side so as to adjust the interval in the vertical direction on both sides of the first and second fixing stands. A table unit having a first and a second movable stand, wherein the table unit vacuum-adsorbs a glass substrate through intake holes formed in the first and second fixed stands and the first and second movable stands; A gap adjusting unit for adjusting a gap between the first and second movable stands with respect to the first and second fixed stands; A guide unit to assist the movement of the first and second movable stands; And a clamping unit for restraining movement of the first and second movable stands. The method of claim 1, wherein each of the first and second polishing apparatus, Vertical feeder; First and second carriages which are spaced apart from each other at predetermined intervals on the longitudinal carriage, and which are provided on one side of the carriage and the carriage linearly moving along the feed screw axis rotated by the drive of the transfer motor and rotated by the drive of the spindle motor. First and second polishing units each having two polishing wheels; An elevating adjustment unit for elevating the first and second abrasive wheels; And a cooling unit configured to cool the first and second polishing wheels. The method of claim 1, wherein the turning device, An operating shaft operatively connected to the index motor to rotate; An elevating cylinder for elevating the working shaft; A turning plate attached to the lower end of the working shaft, a main vacuum pad mounted at the center of the lower surface of the turning plate to suction the glass substrate, an arm extending radially at the corner of the turning plate, and along the arm; A glass substrate edge grinder system for a liquid crystal display device, comprising a chucking unit having a pair of sub-vacuum pads mounted on the substrate to allow a gap adjustment of the glass substrate. The method of claim 1, wherein each of the first and second centering device, A pair of first push units installed at one end of the first and second conveying devices and supporting and pushing one end of the glass substrate in the conveying direction; A pair of second push units installed at the other ends of the first and second conveying apparatuses and supporting the other ends of the glass substrate in the conveying direction to push against the first push units; A glass substrate edge grinder system for a liquid crystal display device installed in the main body of the system and comprising a pair of third and fourth push units which support both ends of the glass substrate in the conveying direction and push each other in cooperation toward the center. .