JPS6312251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is an automatic laminating machine that laminates a polarizing plate provided with an adhesive layer with a member to be attached such as a liquid crystal cell. This invention relates to a defect detection device used for removing chisels.

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, the process of laminating polarizing plates and liquid crystal cells is required. A bonding device that can perform the process automatically has already been proposed.

Conventional automatic laminating equipment inputs adhesive polarizing plates cut into predetermined widths and lengths.
Alternatively, as shown in Figure 1, polarizing plates 2 of a predetermined length are laminated at regular intervals on tape 1 that protects the adhesive layer using a labeler-processed polarizing plate. This is a method in which the plates 2 are pasted together while being peeled off, and each structure uses a polarizing plate that has been cut to a certain size in advance.

The process of processing polarizing plates of a certain length in advance so that they can be used in laminating equipment requires equipment such as a labeling machine that has mechanisms that overlap with the laminating equipment, which increases equipment costs. Not only that, but it also had to be manufactured in a completely separate process, resulting in poor workability.

In addition, since polarizing plates are used that have been 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 loss of the plate increases, making it uneconomical.

This invention was made in view of the above-mentioned problems and drawbacks, and it involves cutting a continuous long polarizing plate immediately before laminating it together, and detecting a defect in the polarizing plate to locate the position immediately after the defect. A defect detection device that can cut and remove defective parts with minimal loss, simplify polarizing plate processing equipment by using long polarizing plates, and reduce waste of polarizing plates. The purpose is to provide.

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

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

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.

The clamp 18 is configured to clamp the polarizing plate tape 3 with the separator 6 facing down and send it forward when moving forward, and to release the clamp and return when retreating.

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 horizontally onto the air feeder 17. 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 2 that provides vertical movement on the cutter 23
4 and 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,
A detection sensor 25 is provided at the bottom of a slit 26 that is provided to penetrate vertically.

The blade 23 is located directly above the slit 26 of the blade holder 22 which is in the forward position, and the blade 23 and the blade holder 22 are arranged so that when the blade 23 moves downward to the cutting position, the blade holder 22 moves backward and the slit is removed. It is interlocked with an L-shaped lever 27 so that cutting is performed at a position where 26 is not present.

The vertical stroke of the knife 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 the defect 3a of the polarizing plate tape 3 moving on the knife holder 22 on the knife 23.
Perform line observation at a position directly below. 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 through the cut 3b.

Thereafter, this cutting is performed by making a half cut of a certain length 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.
This is to remove only the defective polarizing plate 4a cut out from the separator 6, and the cutter holder 22
A peeling claw 29 is arranged above the polarizing plate tape 3 pulled out forward from above and swings around a pivot 28.
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.

When the sensor 25 of the defect detection device 14 detects the defect 3a, the cylinder 30 is operated to extend.
The peeling claw 29 rotates downward and pushes down the polarizing plate tape 6 with its tip, and by bending this tape 6 with the tip of the blade holder 22, removes the advancing defective polarizing plate 4a from the separator 6 at the bent part. It is peeled off and transferred onto the film 31 on the peeling claw 29.

The film 31 to which the polarizing plate 4a is to be transferred 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, and guided to the upper surface side along the tip of the claw. After bending and passing between the peeling claw 29 and the pressure roller 36 provided above, the motor 3
The film passes between a drive roll 38 and a pinch roller 39, and is wound onto a take-up reel 40 located above.

The roller 38 of the motor 37 rotates for a certain period of time each time the sensor 25 detects the defect 3a,
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; A guide 42 that guides 4b to move forward.
A front end detection sensor 43 is disposed in front of the tip of the guide 42, and a laminating roll 44 is disposed above the sensor 43 so as to be movable up and down.

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 adapted 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 proceeded 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. This is what we do.

The above-mentioned 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 the vertical movement cylinder 52 of the laminating roll 44 by an L-shaped lever 51. When the laminating roll 44 moves downward and presses the non-defective polarizing plate 4b and the liquid crystal cell 9 together, the detection sensor 43 moves away and does not interfere with the lamination.

The drive roller 46 that feeds the separator 6 works in conjunction with the front end detection sensor 43, and the separator 6 is moved until the front end of the non-defective polarizing plate 4b reaches the sensor 43.
It is now possible to move the . Also, guide 4
The polarizing plate tape 3 is guided from the tape 2 onto the peeling table 41 by a tension reel 53 provided on the way.
It is done through.

The defect detection device of the present invention has the above-mentioned configuration, and its operation 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 11.

If there is no defect in the polarizing plate, when the feeding device 13 finishes feeding (FIG. 6), 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. (FIG. 7) 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 to clamp the polarizing plate tape 3 again. (FIG. 8) Then, the feeding device 13 operates to repeatedly perform the operations shown in FIGS. 6 to 8 as described above, and cut out good quality polarizing plates 4b.

Also, if the polarizing plate has defect 3a, this defect 3
When a passes over the sensor 25 (FIGS. 9 and 10), as soon as it finishes passing, the feeder 1
7 stops moving forward and is reset to the retracted position.

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 3a immediately after the defect 3a (FIG. 11), after which the process returns to the state of cutting out a good polarizing plate.

When the sensor 25 detects the defect 3a, the cylinder 30 of the defect removing device 15 is operated to extend, and the peeling claw 29 rotates so that its tip moves downward, and maintains this state until the next feeding is completed. The polarizing plate tape 3 is bent, and the defective polarizing plate 4a is attached to the separator 6.
It is peeled off from the film 31 and transferred onto the film 31.

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 is raised, and the polarizing plate tape 3 advances to the laminating device 16 with only the good polarizing plate 4b remaining on the separator 6. The non-defective polarizing plate 4b is peeled off from the separator 6 by the peeling table 41, and is fed out until the front edge is detected by the front edge 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, the cylinder 52 is activated to extend. The laminating roller 44 moves downward,
At the same time, the sensor 43 moves forward, so the good polarizing plate 4b overlaps the liquid crystal cell 9, and the conveyor 1
The lamination is performed by running the roller 0 and pressing the laminating roller 44.

When the lamination is completed, the laminating roller 44 is raised, half-cutting progresses as the polarizing plate 4b is consumed, and the product after lamination is printed as necessary, 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 when a defect is detected, a cutter is used to half-cut immediately after the defect. Therefore, the polarizing plate can be used for automatic lamination in a continuous long tape-like state, and there is no need to prepare separate equipment to cut the polarizing plate to a certain length in advance, which significantly reduces equipment costs. It is possible to reduce this amount and improve the efficiency of the bonding work.

Also, if there is a defect in the polarizing plate, you can make a cut in the position immediately after the defect and peel off only the defective part.
There are various effects such as being able to minimize the waste of the polarizing plate and improving the economical efficiency of the polarizing plate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing 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 cross-sectional view of the same tape as above, Fig. 4 is a perspective view showing the state of the cuts made in the polarizing plate tape, and Fig. 5 is an enlarged sectional view of the tape.
The figure is a front view of an automatic laminating machine incorporating the defect detection device of the present invention, and each of FIGS. 6 to 11 is a process diagram 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, 22... Blade holder, 23
...Knife, 24...Cylinder, 25...Sensor, 27...L-shaped lever.

Claims (1)

[Claims] 1 A feeding device in which the adhesive layer reciprocates and intermittently feeds a long polarizing plate protected by a separator to a predetermined length; A half-cut knife that moves up and down by a cylinder installed above a movably supported blade holder to cut only the polarizing plate, leaving the polarizing plate separator behind, and a blade holder that is in the forward position directly below the blade. A defect detection sensor is installed below the slit provided in the cutter, so that when the cutter moves down to the cutting position, the cutter holder will retreat.
A polarizing plate defect detection device that links the blade and the blade holder and retracts the feeding device to the starting position based on the detection signal from the defect detection sensor, causing the blade to perform cutting operations, and a polarized light drawn forward from the blade holder. The peeling claw provided above the plate is oscillated by the signal from the defect detection sensor, runs directly above the polarizing plate in the opposite direction, is folded back above the peeling claw, and is driven for a certain period of time by the signal from the defect detection sensor. A defective polarizing plate removing device is provided with a film that receives the defective polarizing plate that is cut leaving the separator and peeled off with a peeling claw, and a peeling table that removes the separator from the polarizing plate tape that has passed through the defective polarizing plate removing device. ,
A laminating roll that descends in response to a detection signal from a movable tip detection sensor that detects the tip of the polarizing plate, and at the same time retreats the tip detection sensor to press and adhere the polarizing plate onto the liquid crystal cell sent below the polarizing plate. A polarizing plate defect detection device for an automatic adhesive polarizing plate laminating machine, comprising: a laminating device equipped with the following.