JPS6214812B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic bonding method for bonding a polarizing plate provided with an adhesive layer to a member to be bonded such as a liquid crystal cell.

Products made by laminating polarizing plates and liquid crystal cells are extremely versatile and important components for optical and electronic equipment, but in order to efficiently manufacture such products, it is necessary to laminate polarizing plates and liquid crystal cells. A bonding method that allows the work to be performed automatically has already been proposed.

In the conventional automatic laminating method, adhesive polarizing plates are cut into predetermined widths and lengths, and then
Either paste this or as shown in Figure 1,
This method uses a labeler-processed polarizing plate in which polarizing plates 2 of a predetermined length are laminated at regular intervals on a tape 1 that protects the adhesive layer, and the polarizing plates 2 are laminated while being peeled from the tape 1. This method also uses a polarizing plate that has been cut to a certain size in advance.

The process of pre-processing polarizing plates of a certain length so that they can be used for automatic lamination requires equipment such as a labeling machine that has a mechanism that overlaps with the lamination equipment, which only increases equipment costs. However, since it has to be manufactured in a completely different process from bonding, there is a problem in that workability is poor.

In addition, since polarizing plates are used that are cut to a certain length in advance, if there are defects such as defect marks or priming parts on the surface of the polarizing plate, the entire polarizing plate becomes unusable, and the polarizing plate becomes unusable. The disadvantage is that the amount of loss generated is large, making it uneconomical.

This invention was proposed to solve the above-mentioned problems and drawbacks, and uses a continuous long polarizing plate in the form of a tape, and cuts the polarizing plate immediately before laminating it. If there is a defect in the polarizing plate, it can be removed with minimum loss, and by using a long polarizing plate, the polarizing plate processing equipment can be simplified, the loss of the polarizing plate can be reduced, and moreover, accurate lamination can be performed. The purpose of this invention is to provide an automatic bonding method that allows

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Long polarizing plate tape 3 used in the method of this invention
As shown in FIGS. 2 and 3, a long polarizing plate 4 is laminated with a polyester separator 6 that protects an adhesive layer 5, and is cut into a predetermined width to form a long tape. An aluminum film 8 is provided on the side with an adhesive layer 7 in between.

An automatic bonding machine for bonding the long polarizing plate tape 3 to the liquid crystal cell 9 is disposed above the conveyor 10 that intermittently conveys the liquid crystal cell 9 as shown in FIG. A substrate 11 that stands upright, a supply reel 12 attached to the top of the substrate 11 and winding the long polarizing plate tape 3 into a roll, and A feeding device 13 that pulls out the polarizing plate tape 3 and intermittently feeds it in the horizontal direction, a defect detecting device 14 provided in front of the feeding device 13 in the feeding direction, and a defect detecting device 14 provided in front of the defect detecting device 14 in the moving direction of the polarizing plate tape. Arranged defect removal device 15
and a bonding device 1 attached to the lower part of the substrate 11.
6.

The feeding device 13 is formed using an air feeder 17, and a clamp 18 attached to the tip of a piston rod moves back and forth between it and a stopper 19 in front. When moving forward, the clamp 18 clamps the polarizing plate tape 3 with the separator 6 facing down and sends it forward, and when moving back, the clamp 18 releases the clamp and returns.

Between the feeding device 13 and the supply reel 12 disposed above it, there are a tension roll 20 and a guide roll 21 that guide the polarizing plate tape 3 pulled out from the reel 12 so that it enters the air feeder 17 horizontally. It is provided.

The defect detection device 14 is arranged so as to be able to move up and down directly above the blade holder 22 and the blade holder 22 that supports the lower separator 6 of the polarizing plate tape 3 that passes through the feeder 13 and moves horizontally. a cutter 23 and a cylinder 24 that gives vertical movement to the cutter 23
It is also formed by a defect detection sensor 25 attached to the lower part of the blade holder 22.

The knife holder 22 is arranged so as to be horizontally movable along the longitudinal direction of the polarizing plate tape 3, and has a slit 26 provided vertically penetrating it.
A detection sensor 25 is attached to the lower part of.

The cutter 23 is mounted on a cutter holder 22 in the forward position.
The blade 23 and the blade holder 22 are connected to an L-shaped lever so that when the blade 23 moves down to the cutting position, the blade holder 22 moves backward and cutting is performed at a position where there is no slit 26. It is linked with 27.

The vertical stroke of the blade 23 is set so that when it moves downward, it cuts only the polarizing plate 4 and the adhesive layer 5 (hereinafter referred to as half cut), leaving the separator 6 located at the bottom.

The feeding device 13 and the cylinder 24 of the cutter 23
are interlocked so that the feeding device 13 feeds the polarizing plate tape 3 a certain length to perform a half cut.

The defect detection sensor 25 detects a defect 3a of the polarizing plate tape 3 moving on the knife holder 22 on the knife 23.
Wire monitoring is performed directly below the sensor 2
5 controls the feed mechanism 13 and the cylinder 24 so that when the defect 3a is detected, the feed mechanism 13 is stopped, the clamp 18 is opened and the clamp 18 is retracted to the starting position, and the blade 23 is given a cutting action. When a defect 3a is detected, a half-cut cut 3b is made immediately after the defect 3a, as shown in FIG. 4, and a short defective polarizing plate 4a is cut out by this cut 3b.

In the subsequent cutting, a half cut of a certain length is made with this cut 3b as the tip, and a non-defective polarizing plate 4b is cut out along the cut 3c.

The defect removing device 15 is the defect detecting device 14.
It is for removing only the defective polarizing plate 4a cut out from the separator 6, and is placed above the polarizing plate tape 3 pulled out forward from the blade edge holder 22, and swings around a pivot 28. Peeling claw 29
and a cylinder 30 that swings this peeling claw 29.
It is formed of a film 31 made of polyester or the like that runs directly above the polarizing plate tape 3 in the opposite direction, and receives and transfers the defective polarizing plate 4a on the upper surface of the peeling claw 29.

When the tip of the peeling claw 29 faces directly in front of the blade holder 22 and the cylinder 30 is in the contracted and raised position, the peeling claw 29 does not do anything to the polarizing plate tape 6 moving from the blade holder 22 toward the guide 32 in front. Doesn't work.

The sensor 25 of the defect detection device 14 detects defect 3.
When a is detected, the cylinder 30 is activated to extend, and the peeling claw 29 rotates downward to remove the polarizing plate tape 6 with its tip.
By pressing down and bending this tape 6 with the tip of the blade holder 22, the defective polarizing plate 4a that has moved forward is peeled off from the separator 6 at the bent part,
It is transferred onto the film 31 on the peeling claw 29.

The film 31 that transfers the defective polarizing plate 4a is
It is pulled out from the supply reel 33 attached to the front of the upper part of the substrate 11, guided to the lower surface of the peeling claw 29 via the tension roller 34 and guide roller 35, bent to the upper surface side along the tip of the nail, and provided on the upper part of the peeling claw 29. After passing between a pressing roller 36 and a pinch roller 39 driven by a motor 37, the sheet is wound onto a take-up reel 40 above.

The roller 38 of the motor 37 is connected to the sensor 25
Each time it detects a defect 3a, it rotates for a certain period of time, and the transferred defective polarizing plate 4a is sequentially wound onto the reel 40 side.

The laminating device 16 includes a peeling table 41 that bends the separator 6 of the polarizing plate tape 6 in a folded shape along the V-shaped edges and peels off the good polarizing plate 4b from the separator 6, and a peeling table 41 that peels off the good polarizing plate 4b from the separator 6, and a guide 42 that guides 4b to move forward;
A front end detection sensor 43 is placed in front of the tip of this guide 42, and a laminate roll 44 is placed above the sensor 43 so as to be able to rise and fall freely.
It is formed of.

The separator 6 from which the non-defective polarizing plate 4b has been peeled off on the peeling table 41 is pulled out rearward from the lower part of the peeling table 41, passed between a guide roller 45, a drive roller 46 driven by a motor, and a pinch roller 47, and is placed on the lower part of the substrate 11. It is configured to be wound up on a take-up reel 48 attached to.

The front edge detection sensor 43 detects the front edge of the non-defective polarizing plate 4b that has advanced along the guide 42 directly above the conveyor 10, and accurately aligns it with the front edge of the liquid crystal cell 9 sent by the conveyor 10. It is something that does.

The detection sensor 43 is supported via a sliding body 50 on a horizontal shaft 49 arranged horizontally along the moving direction of the conveyor 10, and the sliding body 50 is connected to an L-shaped lever 51 that moves the vertical movement cylinder 5 of the laminating roll 44.
2, when the laminating roll 44 moves downward and presses the good polarizing plate 4b and the liquid crystal cell 9,
The detection sensor 43 moves away so as not to interfere with the lamination.

The drive roller 46 for feeding the separator 6 is linked with a front end detection sensor 43 to move the separator 6 until the front end of the non-defective polarizing plate 4b reaches the sensor 43. In addition, the guide 42
The polarizing plate tape 3 is guided from above onto the peeling table 41 as follows.
This is done via a tension reel 53 provided in the middle.

The automatic bonding method of the present invention is carried out using a bonding apparatus configured as described above, and the bonding method will be explained next.

Polarizing plate tape 3 pulled out from reel 12
is intermittently sent forward by the air feeder 17 of the feeding device 13, which is set to send out the required size.

The polarizing plate tape 3 is put out onto the blade holder 22 of the defect detection device 14 with the separator 6 facing down.
At this portion, the sensor 25 detects the presence or absence of a defect.

The operational relationship between the feeding device 13 and the defect detection device 14 is shown in FIGS. 6 to 14.

If there is no defect in the polarizing plate, when the feeding device 13 finishes feeding (see Fig. 8), the blade 23 moves downward, and at the same time, the blade holder 22 moves backward to make a half cut against the polarizing plate tape 3. Then, cuts 3c are provided in the polarizing plate 4 and the adhesive layer 5. (See FIG. 9) When the half cut is completed, the knife 23 rises, the knife holder 22 also returns to the forward position, and the sensor 25 starts detecting defects again. At the same time, the clamp 18 of the feeding device 13 opens and returns to the retracted position.
(See Figure 10) Hold the polarizing plate tape 3 again and send it forward. (See FIG. 11) Next, the feeding device 13 operates to feed, and the operations shown in FIGS. 8 to 11 are repeated as described above to cut out non-defective polarizing plates 4b.

Furthermore, if the polarizing plate has a defect 3a, when the defect 3a passes over the sensor 25 (FIGS. 12 and 13), the forward movement of the feeder 17 is stopped and reset to the retreat position at the same time as the defect 3a passes over the sensor 25 (FIGS. 12 and 13). be done. While the feeding of the polarizing plate tape 3 is stopped,
The knife 23 is lowered, and a half cut is made to form a cut 3b immediately after the defect 3a (see FIG. 13), after which the process returns to the cutting state of a non-defective polarizing plate.
(Refer to Fig. 14) When the sensor 25 detects the defect 3a, the cylinder 30 of the defect removing device 15 is extended and the peeling claw 29 rotates so that the tip of the claw moves downward. While maintaining this state, the polarizing plate tape 3 is bent, and the defective polarizing plate 4a is peeled off from the separator 6 and placed on the film 31.
(See FIGS. 6 and 14) When the defective polarizing plate 4a is transferred to the film 31,
While the film 31 travels a certain length, the cylinder 30 is contracted and the peeling claw 29 rises, and the polarizing plate tape 3 advances to the laminating device 16 with only the good polarizing plate 4b remaining on the separator 6, and the non-defective film is removed. The polarizing plate 4b is peeled off from the separator 6 by the peeling table 41, and is fed out until the front end is detected by the front end detection sensor 43.

At the same time as the sensor 43 catches the good polarizing plate 4b with the adhesive layer 5 facing downward, the peeling stops, and if the liquid crystal cell 9, which was previously conveyed to the fixed position by the conveyor 10, is in the fixed position, as shown in FIG. , the cylinder 52 extends and the laminating roller 44 moves downward, and at the same time the sensor 43 moves forward, so the good polarizing plate 4b overlaps the liquid crystal cell 9, and due to the running of the conveyor 10 and the pressure applied by the laminating roller 44. Lamination is performed.

When the lamination is completed, the laminating roller 44 is raised and half-cutting progresses as the polarizing plate 4b is consumed, and the product after lamination is printed as required and is discharged from the equipment by the conveyor 10.

As described above, according to the present invention, a sensor detects a defect in a long polarizing plate whose adhesive layer is protected by a separator while it is being moved, and cuts only the polarizing plate at regular intervals and cuts immediately after the defect. , defective polarizing plates are peeled off during transportation, and good polarizing plates are peeled from the separator and then aligned with the adhered material before being laminated, so that the polarizing plates can be automatically made into a continuous tape-like long piece. It can now be used for lamination, and there is no need to prepare equipment to cut the polarizing plate to a certain length in advance, so it is possible to significantly reduce equipment costs, improve the efficiency of lamination work, and reduce costs. shall be.

In addition, if there is a defect in the middle of the polarizing plate, a cut is made immediately after the defect and only the defective part is peeled off, so the waste of the polarizing plate can be minimized.
The economic efficiency of the polarizing plate can be improved.

Furthermore, even if there are non-defective polarizing plates whose spacing is uneven due to the removal of defective polarizing plates, the front edge can be detected in the correct position and laminated, so accurate lamination can be performed automatically and efficiently. This makes it possible to reliably prevent the occurrence of defective products during bonding.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional polarizing plate tape, Fig. 2 is a perspective view of a polarizing plate tape used in the present invention, Fig. 3 is an enlarged sectional view of the same tape, and Fig. 4 is a perspective view of a polarizing plate tape used in the present invention. A perspective view showing the state of the cut,
Fig. 5 is a front view of the laminating device, Fig. 6 is a perspective view of the defect removal part in the same as above, Fig. 7 is an enlarged front view showing the laminating operation state of the laminated part, and Fig. 8
Each of the drawings to FIG. 14 is a process chart showing the operating order of the main parts of the same. 3... Polarizing plate tape, 4... Polarizing plate, 5... Adhesive layer, 6... Separator, 13... Feeding device, 14... Defect detection device, 16... Laminating device, 22... Tool post,
23...Knife, 25...Sensor, 29...Peeling claw, 3
1...Film, 43...Sensor, 44...Laminating roller.

Claims (1)

[Claims] 1 A tape-shaped long polarizing plate with an adhesive layer protected by a separator is moved intermittently in the longitudinal direction, and while the long polarizing plate is being moved, the presence or absence of defects on the polarizing plate is detected, and if there are no defects, Cut only the polarizing plate at regular intervals, and if there is a defect, make similar cuts immediately after the defect to cut out the good polarizing plate and the defective polarizing plate of a certain length, then remove only the defective polarizing plate from the separator. After peeling and removing, the good polarizing plate remaining on the separator is moved to the part where it will be bonded to the bonded material, and then peeled off from the separator just before bonding, and the peeled good polarizing plate is aligned with the bonded material directly below. 1. An automatic bonding method for adhesive polarizing plates, characterized by continuously performing pressure bonding.