JPS618297A - Cutter for polarizing plate for liquid crystal display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides an original plate of a polarizing plate used for a liquid crystal display element,
The present invention relates to a cutting device for a polarizing plate for a liquid crystal display element, which cuts the polarizing plate at an arbitrary angle with respect to its absorption axis.

[Background of the invention]

A conventional polarizing plate cutting device has a structure as shown in FIG. A polarizing original plate 2 affixed to the upper surface of the bottom plate 1 with an adhesive tape 1a is held by a feed roller 3 and a pressure roller 4, and is sent below a cutter blade 6 on a base 5 at a constant pitch. The cutter blade 6 is fixed to a die set 7, and the die set 7 is fixed to a ram 9 that moves up and down along a slide guide 8 fixed to the base 5.

Therefore, as described above, the ram 9 moves up and down each time the original polarizing plate 2 is fed by a certain pitch, and is cut as shown by the cutting line 2a. In this case, the cut of the power cutter blade 6 is made halfway through the bottom plate 1, as shown in FIG.

However, this structure can only be cut in a direction perpendicular to the input direction of the original polarizing plate 2. For this reason, the following method is used to cut the polarizing plate at a required angle with respect to the absorption axis.

First, before inserting the original polarizing plate into the cutting device, as shown in Figure 3 (a)
), a strip-shaped original polarizing plate 10 wound in a p-ru shape is cut along a cutting line 10a having an inclination angle θ with respect to the absorption axis 11.
Cut with. This cutting is done manually using a paper cutter or the like. Next, as shown in FIG. A bottom plate 13 is placed on the bottom surface of the board, and the end surface is pasted with adhesive tape 13a. The long polarizing plate pasted in this way is put into the cutting device shown in FIG. 1, and cut into a predetermined shape as shown in FIG. Depth of cut 10b with width l
Put in. Next, as shown in FIG. 4(d), the pieces are separated by a certain width, the cutting line 10a sides are butted together, and the pieces are bonded together again using the adhesive tape 14 to form a long polarizing plate. This long polarizing plate was put into the cutting device shown in Fig. 1 again, and the
A cut 10c having a width W is made as shown in FIG. 3(e) using a method similar to that described in the drawing. As a result, Wxl
A polarizing plate having an absorption axis at a small angle θ is cut. Next, the adhesive tapes 12 and 14 are removed and the bottom plate 13 is separated to obtain a polarizing plate for a liquid crystal display element.

As described above, the conventional polarizing plate cutting device can only cut the polarizing plate in the direction perpendicular to the direction in which the original polarizing plate is introduced, which requires manual labor as explained in FIG. 3(a). Attaching many types of adhesive tapes 12 and 14 as explained in (b) lc) and (d) requires a lot of work and has poor workability. Furthermore, as is clear from FIG. 3 (61), there are many connections using adhesive tapes 12 and 14 for short polarizing plates, and the polarizing plates at these connections do not have a predetermined shape and are wasted. Material usage efficiency is very poor.

[Purpose of the invention]

An object of the present invention is to provide a cutting device for polarizing plates for liquid crystal display elements, which can be mass-produced, reduce manufacturing man-hours, and improve material usage efficiency when cutting polarizing plates by arbitrarily selecting the absorption axis angle. It is about providing.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized in that a die set to which a cutter blade is fixed is fixed to a vertically moving ram so that its angle can be adjusted with respect to the feeding direction of the original polarizing plate.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The base 20 is provided with guide rollers 21 and 22, a feed reeler 23 and a pressure roller 24 that are driven by a driving means (not shown), and are similar to a band-shaped original polarizing plate 25 wound into a roll. The belt-shaped bottom plate 26 wound into a roll is held between the rollers 21 to 24 and fed by the rotation of the feed roller 23. The base 20
A slide guide 27 is fixed to each side of the slide guide 27, and a ram 28 is disposed on the slide guide 27 so as to be movable up and down. A die set 30 to which a power filter blade 29 is fixed is disposed on the lower surface of the ram 28, and the die set 30 is fixed to the ram 28 by bolts 31 through an arcuate groove 28m provided in the ram 28. ing. Therefore, by loosening the bolt 31 and rotating the die set 30, the cutter blade 29 can be adjusted to an arbitrary angle with respect to the feeding direction of the original polarizing plate 25. This angle setting is done using the scale 3 provided on the base 20.
It can be easily determined by 2.

Next, the case of manufacturing a polarizing plate for a liquid crystal display element using such an apparatus will be explained with reference to FIGS. 5 and 6. First, the fourth
The angle of the power filter blade 29 shown in the figure is adjusted as described above so that it matches the cutting line 25a shown in FIG.

Then, when the feed roller 23 is driven, the original polarizing plate 25
and the bottom plate 26 are overlapped by guide rollers 21 and 22, and are intermittently pitched below the cutter blade 29 by a feed roller 23 and a pressure roller 24. Each time the polarizing original plate 25 and the bottom plate 26 are intermittently pitch-fed, the ram 28 moves up and down, and as shown in FIG. A cut of 25 m in width W is made at an angle of θ.

This cut 2Fia is made halfway into the bottom plate 26. Therefore, the polarizing plate on the short side of the cut width W is not separated and remains continuous.

Next, the original polarizing plate 25 with the cutting line 25a inserted therein is cut along the cutting line 25a shown in FIG.
5b into a cutting device adapted to suit. As a result, cuts 25b are made at an angle perpendicular to which cut 25a and at intervals of width l. Finally, the bottom plate 26
When separated, a polarizing plate of Wx/ having an absorption axis at an angle of θ is obtained.

In this way, since it can be cut at any angle, the conventional process of manual diagonal cutting and multiple application of adhesive tape is unnecessary, and the number of man-hours is significantly reduced. In addition, the minimum number of cuts is two, and there are no unnecessary cutting lines, so material utilization efficiency is greatly improved. Also power ° Tsuta Blade 2
Since the angle settings of 9 can be arbitrarily selected, conventional orthogonal cutting is also possible, providing versatility.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a die set to which a force-putter blade is fixed is fixed to a vertically moving ram so that the angle can be adjusted with respect to the feeding direction of the original polarizing plate. When cutting the polarizing plate by arbitrarily selecting the angle of the absorption axis, the number of man-hours can be reduced and the efficiency of material usage can be improved.

[Brief explanation of the drawing]

Fig. 1 shows a conventional cutting device, (a) is a plan view, (b)
l is a front view, Fig. 2 is an enlarged view of the cut state, Fig. 3 (a)
thru +e) are explanatory diagrams showing the conventional cutting process of a polarizing plate, FIG. 4 shows an embodiment of the cutting device according to the present invention, and (a)
is a plan view, (b) is a front view, and FIGS. 5 and 6 show the cutting process of a polarizing plate using the cutting device shown in FIG. 4. In each figure, (al is a plan view, ( b) is a front view. 23... Feed roller, 25... Polarizing original plate, 28... Ram, 28a...
Groove, 29... Force stub blade, 30, Die set, 31... Bolt.

Claims (1)

[Claims] A liquid crystal display in which a die set with a fixed cutter blade is fixed to a ram that moves up and down, and a strip-shaped polarizing original plate is sent below the cutter blade at a constant pitch, and cut into a fixed width by the vertical movement of the cutter blade. A cutting apparatus for polarizing plates for liquid crystal display elements, characterized in that the die set is fixed to the ram so as to be adjustable in angle with respect to the feeding direction of the original polarizing plate.