JPH11208986A - Protective sheet separating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate a protective sheet of a polarizing plate by an adhesive tape at high speed. SOLUTION: A protective sheet separating device has a suction plate 10 fixing a polarizing plate 1; a separating roller 16 wound with an adhesive tape 12; a uniaxial stage 20 mounted with the separating roller 16 and an actuator 18; a guide roller 22 driven by a motor 24; and a take-up reel 26 for taking up the spent adhesive tape. Needle-like protrusions 32 that can stick into the adhesive tape are arranged at the outer periphery of the guide roller 22, and the adhesive tape 12 is taken up with constant tension even in the case of the rise of a torque motor 28 being delayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective sheet peeling apparatus for peeling a protective sheet from an article, such as a polarizing plate, to which the protective sheet is attached.

[0002]

2. Description of the Related Art A color liquid crystal display includes a liquid crystal panel having polarizing plates attached to both sides. In a production process of the color liquid crystal display, the polarizing plates are bonded to both sides of the liquid crystal panel. As shown in FIG. 1, a polarizing plate 1 manufactured at a polarizing plate manufacturing factory and carried into a production facility for a color liquid crystal display has a surface protection sheet 2 and a back surface protection to protect from dirt and damage during handling. Sheet 3 is attached in advance. Therefore, in bonding a polarizing plate to a liquid crystal panel in a production facility for a color liquid crystal display, the back surface protection sheet 3 must first be peeled from the polarizing plate 1.

Conventionally, a peeling device shown in FIG. 2 has been used to peel a protective sheet from a polarizing plate. The apparatus includes a suction plate 10 for fixing a polarizing plate and an adhesive tape supply reel 14 for supplying an adhesive tape 12.
A peeling roller 16 around which an adhesive tape is wound, and an actuator 18 for pressing the peeling roller against the polarizing plate
A uniaxial stage 20 having a peeling roller and an actuator mounted on a moving stage, a guide roller 22 for preventing interference between the adhesive tape and the uniaxial stage, and an adhesive tape used together with the peeled back protective sheet 3. The take-up reel 26 includes a take-up reel 26, a torque motor 28 that rotationally drives the take-up reel, and a one-way clutch 30 that prevents the take-up reel from rotating in a direction opposite to the take-up direction.

[0004] The operation of this conventional device will be described.
Are brought under the suction plate 10 one by one, and the polarizing plate 1 is fixed to the suction plate 10 by sucking the side of the surface protection sheet 2. Next, by moving the uniaxial stage 20, the peeling roller 16 is advanced to the peeling start position shown by the chain line in FIGS. 2 and 3, the actuator 18 is extended, and the peeling roller 16 is pressed against the polarizing plate 1. In this state, the torque of the torque motor 28 is increased, and the tension capable of peeling the back protection sheet 3 is increased by the adhesive tape 1.
2 to move the single-axis stage 20 backward. Along with this, the adhesive tape peels the back protective sheet 3 adhered thereto from the polarizing plate 1. At the same time, the used adhesive tape is taken up on the take-up reel 26 together with the adhered back surface protection sheet 3. When the single-axis stage 20 returns to the home position, the peeling roller 16 is lowered, and the torque of the torque motor 28 is reduced to such an extent that the adhesive tape does not hang down, in preparation for the next cycle.

[0005]

In this apparatus, the torque applied from the torque motor 28 to the adhesive tape during the winding of the adhesive tape is constant, but as the used adhesive tape is wound on the take-up reel 26, As the diameter of the adhesive tape on the take-up reel increases, the tension acting on the adhesive tape decreases as the winding progresses.
For this reason, if the retreat speed of the peeling roller 16 is set to a high speed in order to peel the adhesive tape at a high speed, the rise of the tension of the adhesive tape becomes slow as the diameter of the adhesive tape on the take-up reel increases. As shown by the solid line, the retreating peeling roller 16 separates from the adhesive tape. At this moment, the tension of the adhesive tape becomes zero. Next, after the retreat speed of the peeling roller reaches a steady state, the winding by the torque motor catches up, and the adhesive tape is wound again around the peeling roller. At this moment, the tension of the pressure-sensitive adhesive tape increases impulsively. As a result, the polarizer may come off from the suction plate due to the impact force,
The adhesive tape sometimes broke.

An object of the present invention is to solve the problems of the prior art and to provide a peeling device capable of rapidly and stably peeling a protective sheet from an article such as a polarizing plate.

[0007]

According to the present invention, there is provided a holding plate for holding an article to which a protective sheet is attached,
Adhesive tape supply means such as an adhesive tape supply reel for supplying the adhesive tape to the area of the holding plate, a peeling roller around which the adhesive tape is wound, and a peeling roller for pressing the peeling roller against the article held on the holding plate Roller driving means for moving the tape in parallel with the holding plate, a guide roller for preventing interference between the adhesive tape and the peeling roller driving means, and a take-up reel and a torque for winding the used adhesive tape. A winding means such as a motor, wherein the guide roller is provided with a secure engagement means for securely engaging the adhesive tape from the non-adhesive surface side of the adhesive tape, and the guide roller A driving means such as a speed control motor for driving the rotation of the motor is provided.

As described above, the guide roller is provided with the reliable engagement means for securely engaging the adhesive tape from the non-adhesive surface side of the adhesive tape, and the driving roller is driven to rotate the guide roller. The roller is provided with an adhesive tape winding function. As a result, regardless of the increase in the diameter of the adhesive tape on the take-up reel driven by the torque motor, the adhesive tape is wound at a constant speed by the guide roller, so that the adhesive between the peeling roller and the guide roller is increased. A constant tension can be maintained on the tape. Accordingly, the adhesive tape is always wound around the peeling roller without sagging of the adhesive tape between the peeling roller and the guide roller, so that it is possible to avoid the generation of impact tension.

The reliable engagement means of the guide roller engages the adhesive tape from the non-adhesive surface side of the adhesive tape, and winds the adhesive tape at a high speed in a non-contact state with the adhesive surface of the adhesive tape. Therefore, the adhesive does not adhere to the guide roller, and the maintainability of the apparatus is excellent.

In a preferred embodiment, the means for positively engaging the guide roller comprises a needle-like projection disposed on the outer periphery of the guide roller. These needle-like projections engage with the adhesive tape by piercing the adhesive tape, so that the adhesive tape can be reliably wound.

In another preferred embodiment, the positive engagement means includes a negative pressure suction means for applying a negative pressure to the outer peripheral surface of the guide roller to suction the adhesive tape. Since this negative pressure suction means helps the needle-like projection pierce the adhesive tape, the feeding of the guide roller can be further ensured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 4, a peeling apparatus according to the present invention comprises a suction plate 10 for fixing a polarizing plate 1 by suction, and an adhesive tape supply reel 14 for supplying an adhesive tape 12. Roller 16 on which an adhesive tape is wound, and polarizing plate 1 adsorbed on adsorption plate 10
For example, a pneumatic actuator 18 for pressing the peeling roller 16 against the device, and a uniaxial stage 20 on which the peeling roller 16 and the actuator 18 are mounted on a moving stage
And a guide roller 22 for preventing interference between the adhesive tape 12 and the uniaxial stage 20, a speed control motor 24 for rotating and driving the guide roller 22, and the adhesive tape 1 used together with the peeled back protective sheet 3. Take-up reel 26 for winding, a torque motor 28 for rotating and driving take-up reel 26,
Is provided with a one-way clutch 30 for preventing rotation in the direction opposite to the winding direction.

As shown in FIGS. 4 and 5, a large number of needle-like projections 32 are arranged on the outer periphery of the guide roller 22, and the needle-like projections 32 pierce the adhesive tape 12.

The guide roller 22 is provided with a negative pressure suction means 34. As can be clearly understood from FIG. 5, the negative pressure suction means 34 includes a negative pressure port 36 formed along the axis of the guide roller 22, and a radially extending port extending from the negative pressure port 36. The negative pressure port 36 is connected to a negative pressure source (not shown) such as a vacuum pump.

Next, the operation of this apparatus will be described with reference to FIG.
The polarizing plate 1 to which the surface protection sheet 2 and the back surface protection sheet 3 are adhered as shown in (1) is brought one by one below the suction plate 10 by an actuator (not shown) to suck the surface protection sheet 2 side. As a result, the polarizing plate 1 is fixed to the suction plate 10.

Next, by moving the uniaxial stage 20 to the left in FIG. 4, the peel roller 16 is advanced to the peel start position, the actuator 18 is extended, and the peel roller 16 is pressed against the polarizing plate 1. In this state, by increasing the torque of the torque motor 28, a tension capable of peeling the back protection sheet 3 is applied to the adhesive tape 12.
And the retraction of the uniaxial stage 20 is started.

At the same time, the speed control motor 24
And a negative pressure is applied to the negative pressure port 36. The negative pressure acting on the outer periphery of the guide roller 22 via the negative pressure passage 38 causes the adhesive tape 12 to be attracted toward the guide roller 22, so that the needle-like projections 32
It is assisted to pierce. As can be clearly understood from FIG. 5, the guide roller 22 rotates while piercing the needle-like projections 32 into the used adhesive tape 12 (and the back surface protection sheet 3 adhered thereto). Therefore, even if the rise of the torque motor 28 is delayed, the adhesive tape 12 can be reliably taken up at a high speed. As a result, the adhesive tape 12 follows the retraction of the peeling roller 16 well, and is always kept wound around the peeling roller 16.

As described above, since the adhesive tape 12 is always kept wound around the peeling roller 16, the adhesive tape 12 between the peeling roller 16 and the guide roller 22 does not sag, and the adhesive tape 12 There is no impulsive tension.

As the peeling roller 16 retreats, the back protective sheet 3 adhered to the adhesive tape is peeled from the polarizing plate 1. The used adhesive tape is wound up on a take-up reel 26 together with the back surface protection sheet 3 adhered thereto. When the single-axis stage 20 returns to the initial position, the actuator 1
By reducing the number 8, the peeling roller 16 is lowered, and the torque of the torque motor 28 is reduced to the extent that the adhesive tape does not hang down, in preparation for the next cycle.

[0020]

As described above, according to the present invention,
Since the guide roller 22 is provided with the secure engagement means 32 for securely engaging with the adhesive tape and the drive means 24 drives the guide roller to rotate, the torque motor 2
Even if the rise of the adhesive tape 8 is delayed, the adhesive tape 12 is reliably taken up by the guide roller 22 at a high speed.
2 can follow the movement of the peeling roller 16, so that no shocking tension acts on the adhesive tape.
Therefore, the protective sheet can be stably peeled at a high speed.

Further, the reliable engaging means, such as the needle-like projections 32, which engages with the adhesive tape from the non-adhesive surface side of the adhesive tape, winds the adhesive tape in a non-contact state with the adhesive surface of the adhesive tape. Therefore, the adhesive does not adhere to the guide rollers and the like, and the maintainability of the apparatus is excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view of a polarizing plate to which a protective sheet to be peeled is attached.

FIG. 2 is a perspective view of a conventional protective sheet peeling device.

3 is a schematic side view of a part of the conventional protective sheet peeling device shown in FIG.

FIG. 4 is a perspective view of the protective sheet peeling device of the present invention.

5 is an enlarged sectional view of a guide roller of the protective sheet peeling device of the present invention shown in FIG.

[Explanation of symbols]

1: polarizing plate 2, 3: protective sheet for polarizing plate 10: holding plate (adsorption plate) 12: adhesive tape 14: adhesive tape supply means (adhesive tape supply reel) 16: peeling roller 18/20: peeling roller driving means 22 : Guide roller 24: Guide roller driving means (speed control motor) 26/28: Winding means 32: Reliable engagement means (needle-shaped projections) 34, 36/38: Negative pressure suction means

Claims (4)

[Claims] 1. A protective sheet peeling device for peeling off a protective sheet from an article to which a protective sheet is attached using an adhesive tape, comprising: a holding plate for holding the article to which the protective sheet is attached; An adhesive tape supply means for supplying an adhesive tape to an area of the holding plate,
A peeling roller around which the adhesive tape is wound, a peeling roller driving means for pressing the peeling roller against the article held on the holding plate and moving the peeling roller in parallel with the holding plate, and In a protective sheet peeling device provided with a guide roller for preventing interference and a winding means for winding up a used adhesive tape, the guide roller is secured to the adhesive tape from the non-adhesive side of the adhesive tape. And a drive means for rotating and driving the guide roller. 2. The peeling device according to claim 1, wherein the positive engagement means includes a needle-like projection disposed on an outer periphery of the guide roller. 3. The peeling device according to claim 1, wherein the positive engaging means includes a negative pressure attracting means for applying a negative pressure to an outer peripheral surface of the guide roller to attract the adhesive tape. 4. A peeling device according to claim 1, wherein the driving means for rotating and driving the guide roller is a speed control motor.