KR100845176B1 - Printer - Google Patents

Abstract

A printing apparatus is provided to prevent a process error and to improve printing quality by restraining color registers on the outer surface of the Gravure roll from hardening easily. A printing apparatus comprises a Gravure roll(10), a Dr. Blade(20) and a dam part(90). The Gravure roll is coated with one of Red, Green and Blue color registers by a dispenser. The Dr. Blade has an end having a knife(22) disposed on the outer surface of the Gravure roll and removes unnecessary color registers from the outer surface of the Gravure roll. The dam part is coupled to at least one region of the Dr. Blade, and contains the color registers so that a fixed amount of the color registers provided between the Gravure roll and the knife stays.

Description

Print Device {Printer}

1A and 1B are diagrams showing two types of structures of color filter layers printed with R, G, and B patterns, respectively.

2 is a schematic perspective view of a printing apparatus according to an embodiment of the present invention.

3 is a schematic side structure diagram of FIG. 2.

4 is a structural diagram of the frame part shown in FIG. 2.

5 is a schematic structural diagram of a gravure roll and a doctor blade region.

6 is a perspective view illustrating main parts of FIG. 5.

7 to 10 are each step by step showing the operation of the printing apparatus according to the present embodiment.

* Explanation of symbols for the main parts of the drawings

10: Gravure Roll 20: Doctor Blade

21: knife holder 22: knife

30: dispenser 40: blanket roll

42: blanket roll drive for pressure control 46: stopper unit for pressure control

50: movable work stage 60: press roll

70: lower base 75: frame portion

90: dam 91: primary barrier wall

92: secondary barrier wall 93: blade drive unit

94: blade swing portion 94a: ball screw shaft

94b: rotating part

The present invention relates to a printing apparatus, and more particularly, a process error by preventing the color resist applied to the outer surface of the gravure roll from being unnecessarily excessive, while preventing the color resist from hardening on the outer surface of the gravure roll. The present invention relates to a printing apparatus capable of preventing the occurrence of a defect and further improving print quality.

Recently, as the electronic display industry has developed rapidly among the semiconductor industry, flat panel displays (FPDs) have started to appear. Flat panel displays are commonly used as monitors for TVs or computers, or as display devices for devices such as mobile phones, PDAs, and digital cameras. Types of flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light emitting diodes (OLEDs).

The flat panel display typically has a color filter layer for realizing color, and a color filter having a black matrix formed therein to prevent deterioration of image quality of the display device due to light leakage to areas other than the image display area. Is provided.

A typical flat panel display having such a color filter is the LCD described above. The LCD includes a thin film transistor substrate on which a thin film transistor is formed, a color filter substrate on which a color filter layer is formed, and a liquid crystal filled between these substrates.

In the color filter layer, as shown in Figs. 1A and 1B showing two types of color filter layers in which R, G, and B patterns are printed, respectively, R (Red), G (Green), and B (Blue) are typically used. A pixel having a pigment of the pattern is formed. Each pixel may consist of sub-pixels having R, G, and B, but in general, each pixel has one pigment.

In forming the color filter layer, as shown in FIG. 1A, the R, G, and B patterns may be regularly arranged in a line such that the R, G, and B patterns are arranged in the same column, respectively, or as shown in FIG. 1B. Similarly, R, G, and B patterns may be repeatedly arranged in the same row. The difference in resolution can be realized in various ways according to the arrangement of the R, G, and B patterns.

Such a color filter layer can be produced by various methods, for example, dyeing, printing, electrodeposition, pigment dispersion. STN (Super Twisted Nematic) LCD, which is one of the conventional passive matrix methods, mainly produces color filter layers by dyeing, printing, and adhesive methods, but it is an active matrix method that has excellent elaboration, good reproducibility, and is applicable to large-area liquid crystals. In TFT (Thin Film Transistor) LCD, pigment dispersion method is mainly used.

In the pigment dispersion method, a color filter layer is produced by forming a pattern of photosensitive color resist by a general photo process. That is, the color filter layer is completed by applying a photosensitive color resist on a substrate, irradiating light using a mask, and then applying a developer to form a desired pattern.

As such, a photo process is required to form a color filter by the pigment dispersion method, and this photo process causes a problem that the process is not only complicated but also expensive to manufacture. Furthermore, the process is further complicated since the photo process must be repeated three times in order to form pixels corresponding to the dyes of the R, G, and B patterns.

Recently, a method of using the printing method in the TFT LCD field has been proposed to overcome the problems of the pigment dispersion method.

The printing method includes a gravure filled gravure and a corresponding roll to form a color resist pattern of the dye on the substrate by the action of a roll, and then another color color resist by another roll. To form sequentially.

If such a printing method can be put into practical use, the process of manufacturing color filter layers by printing R, G, and B patterns on a substrate can be performed more quickly and effectively. It is not.

Therefore, research and development on such a device is actively in progress. As part of such research and development, the present applicant has previously filed a printing apparatus having various functions for forming R, G, and B patterns on a substrate using a printing method.

On the other hand, the operation of the printing device under study, including the printing device previously filed by the present applicant is as follows. First, when the dispenser applies any of the R, G and B color resists to the outer surface of the gravure roll, the blanket roll transfers the color resist from the gravure roll and then the substrate. The printing operation was performed to the surface of.

At this time, in order for the dispenser to uniformly fill the color resist with the pattern portion formed on the outer surface of the gravure roll, that is, the groove, the color resist should be uniformly evenly spread on the outer surface of the gravure roll, and then on the remaining surface except the recessed groove. The unwanted color resist applied must be removed so that the color resist can only be received inside the recess.

To this end, a doctor blade is provided in the periphery of the gravure roll to remove unnecessary color resist. The doctor blade is provided with a knife of the type whose tip is in contact with the outer surface of the gravure roll (actually known to have some spacing).

With this structure, the front end is continuously contacted with the gravure roll to remove the unnecessary color resist, while continuously supplying the color resist toward the knife of the doctor blade, thereby removing the unnecessary color resist applied on the other side except the recessed groove. Color resist is to be accommodated only in the groove portion of the gravure roll.

However, in this case, since the knife of the doctor blade has a simple straight blade shape, color resist, which is an ink solution provided between the gravure roll and the knife, cannot be accommodated. In other words, when the color resist is provided between the gravure roll and the knife by the dispenser, the color resist flows down immediately immediately, thereby increasing the amount of the color resist used and easily curing due to the lack of solvent. If the color resist is easily cured on the outer surface of the gravure roll, it will not be transferred to the blanket roll, causing a process error.

In addition, the structure of the doctor blade known in the prior art, because the doctor blade rotates toward the gravure roll from the outside of the gravure roll, there is a problem that it is difficult to cope with various curvature changes of the gravure roll according to the rotation position.

It is an object of the present invention to prevent undesirably excessive color resist applied to the outer surface of the gravure roll, while preventing color curing of the color resist easily hardened on the outer surface of the gravure roll, thereby preventing process errors from occurring and further printing. It is to provide a printing apparatus that can improve the quality.

Another object of the present invention is to provide a printing apparatus in which the doctor blade can appropriately cope with various curvature variations of the gravure roll.

The object is, according to the present invention, a gravure roll is applied to any one of the R (Red), G (Green), B (Blue) color resist on the outer surface by a dispenser (Gravure roll); A doctor blade having a knife tip disposed on an outer surface of the gravure roll, and removing unnecessary color resist among color resists applied to the outer surface of the gravure roll; And a dam unit coupled to at least one region of the doctor blade and accommodating the color resist such that the color resist provided between the gravure roll and the knife stays in a predetermined amount.

The doctor blade may further include a knife holder to which the knife is detachably coupled, and the dam part may be coupled to at least one of the knife holder and the knife.

The dam part may be made of an elastic material to elastically close the gap between the gravure roll and the knife to block a gap.

The dam portion may include a pair of primary blocking walls disposed to be spaced apart from each other along the longitudinal direction of the knife to accommodate the color resist.

The dam unit may further include a pair of secondary barrier walls provided on the outer side of the pair of primary barrier walls along the longitudinal direction of the knife to accommodate the color resist together with the pair of primary barrier walls. can do.

The volume of the pair of secondary barriers may be provided relatively larger than the volume of the pair of primary barriers.

It may further include a blade driver coupled to the doctor blade to drive the doctor blade in a substantially straight direction so that the tip of the knife can be disposed on the outer surface of the gravure roll while moving in the normal direction of the gravure roll. have.

The blade driving unit may be an actuator coupled to the knife holder to drive the knife holder in a linear direction.

It may further include a blade swing coupled to the doctor blade, the blade swinging the front end of the knife in the longitudinal direction of the gravure roll.

The blade swing portion is provided along the longitudinal direction of the gravure roll ball screw shaft is coupled to the knife holder; And a rotating part coupled to the ball screw shaft to rotate the ball screw shaft in the forward and reverse directions such that the knife holder can be moved along the length direction of the ball screw shaft.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

For reference, the substrate to be described below refers to a flat panel display (FPD) substrate including a liquid crystal display (LCD), a plasma display panel (PDP), organic light emitting diodes (OLED), and the like, for convenience of description. For the sake of brevity, these will be referred to as substrates. In the area, the substrate to be described below refers to a so-called 3rd and 4th generation small substrate having a length and width of several tens of centimeters.

Figure 2 is a schematic perspective view of a printing apparatus according to an embodiment of the present invention, Figure 3 is a schematic side view of Figure 2, Figure 4 is a structural diagram of the frame shown in Figure 2, Figure 5 is a gravure roll and Fig. 6 is a schematic perspective view of the doctor blade region, and Fig. 6 is a perspective view of main parts of Fig. 5, and Figs. 7 to 10 are views showing the operation of the printing apparatus according to the present embodiment step by step.

As shown in these figures, the printing apparatus according to the present embodiment has a gravure roll 10 and a color R (Red), G (Green), and B (Blue) on the outer surface of the gravure roll 10. Dispenser 30 for applying any of the color resists among the resists (color ink and color pigments) and doctor blades 20 for removing unnecessary color resists among the color resists applied to the outer surface of the gravure roll 10. Blade) and a blanket for transferring any color resist among R, G, and B from the gravure roll 10 to print (retransfer) one of the R, G, and B patterns onto the surface of the substrate G. Blanket roll and at least one of R, G and B patterns for the substrate G together with the blanket roll 40 while moving the substrate G supported on the upper surface to the blanket roll 40 side. Moving work stage (50, moving work stage), the gravure roll 10 and Press roll 60 disposed at the rear of the blanket roll 40, a lower base 60 supporting them at the bottom, a gravure roll 10, a blanket roll 40, a press roll 60, and the like. It is provided on both sides of the frame portion 75 for supporting the gravure roll 10, the blanket roll 40 and the press roll 60 rotatably. The frame portions 75 are provided in pairs.

The gravure roll 10 serves to transfer any color resist selected from R, G, and B color resists to the outer surface of the blanket roll 40. Thus, the gravure roll 10 and the blanket roll 40 have substantially similar volumes. The gravure roll 10 is rotatably mounted at the corresponding position by the frame portion 75. The gravure roll rotating unit 12 (see FIG. 4) is coupled to the frame portion 75 so that the gravure roll 10 may rotate. The gravure roll rotating unit 12 may be applied as a motor. By this gravure roll rotating part 12, the gravure roll 10 substantially only rotates at the corresponding position, and does not move vertically or horizontally. Therefore, it can be said that the gravure roll 10 forms the reference horizontal axis with respect to the blanket roll 40 and the press roll 60 in this printing apparatus.

For reference, as described above with reference to FIGS. 1A and 1B, in printing the R, G, and B patterns on the substrate G, the R, G, and B patterns may not be simultaneously printed on the substrate G through one printing apparatus. Do not. That is, in order to print the R, G, and B patterns on the substrate G, at least three printing apparatuses are provided, and each of the R, G, and B patterns is selected and printed on the substrate G by the three printing apparatuses. .

Therefore, the dispenser 30 which first applies the color resist to the outer surface of the gravure roll 10 by the dispenser 30 has only one color resist selected from the R, G, and B color resists on the outer surface of the gravure roll 10. Will be applied. Expressed easily, the dispenser 30 applies only ink of any color selected from red, green and blue to the outer surface of the gravure roll 10.

Although not shown in detail, the outer surface of the gravure roll 10 is formed with a concave-convex pattern substantially covered with color resist (coated). At this time, the uneven pattern may be embossed or engraved. In the embossed form, the color resist is applied to the outer surface of the protruding convex and concave portion (not shown) to transfer to the blanket roll 40. In the engraved form, the color resist is applied to the inside of the recessed recess 10a. Transition to (40).

However, the blanket roll 40 receives the color resist from the outer surface of the gravure roll 10 and retransfers (prints) it onto the substrate G to form R, G, and B patterns having a shape as shown in FIGS. 1A and 1B. In this case, in order to maintain the thickness of the R, G, and B patterns uniformly from the surface of the substrate G, it may be advantageous that the uneven pattern formed on the outer surface of the gravure roll 10 has a negative shape.

When any of the color resists selected from R, G, and B color resists is applied to the outer surface of the gravure roll 10 by the dispenser 30, as shown in the enlarged portion B of FIG. The color resist should be applied only to the groove portion 10a. However, when the dispenser 30 applies the color resist to the outer surface of the gravure roll 10, it is difficult to apply the color resist at a time such that the color resist is selectively received only in the recess portion 10a of the substantially engraved shape.

Therefore, when the dispenser 30 applies the color resist to the outer surface of the gravure roll 10, the color resist is widely spread on the outer surface of the gravure roll 10 and applied. By removing the unnecessary color resist applied to the remaining surface 10b, the color resist is finally received only in the recess 10a. To this end, the doctor blade 20 is provided in the periphery of the gravure roll 10 to remove unnecessary color resist. The doctor blade 20 will be described later, and the dispenser 30, the blanket roll 40, the movable work stage 50, and the press roll 60 will be described first.

As described above, the dispenser 30 serves to apply color resist to the outer surface of the gravure roll 10. The dispenser 30 is provided to be movable along the longitudinal direction of the gravure roll 10 as well as to be able to be lifted or folded in one direction at the corresponding position. Therefore, the coating efficiency of the color resist can be improved, and interference with the surrounding structure can be avoided.

The blanket roll 40 is rotated by transferring the color resist applied in the groove portion 10a formed on the outer surface of the gravure roll 10, and more particularly, on the outer surface of the gravure roll 10. And a substantially printing roll for printing the R, G, and B patterns as shown in FIG. 1B.

On the outer surface of the blanket roll 40, a sheet to which the color resist is transferred from the gravure roll 10 is wound. Since the sheets used the number of times more than the appropriate limit has to be replaced, the blanket roll 40 is further provided with sheet replacement means (not shown) for easily replacing the sheets. The sheet replacement means serves to provide a certain tension to the sheet so that the sheet can be easily replaced, while the sheet is unfolded and stretched and wound on the outer surface of the blanket roll 40. The sheet replacement means is provided on one surface 40a (see FIG. 3) cut off from the blanket roll 40.

On the other hand, in the case of a printing device for printing a large substrate (not shown), the blanket roll 40 is printed while rotating and moving to the upper surface of the substrate (G) supported on the work stage (not shown) that is fixed at the time of printing substantially Work has been carried out.

However, in the case of the printing apparatus for printing the small substrate G as in the present embodiment, since the blanket structure 40 does not need to be substantially attached to the movable work stage 50, the blanket roll 40 is dare. No need to move That is, the blanket roll 40 is substantially implemented to rotate only at the corresponding position, that is, the print job position, and in this state, the movable work stage 50 supporting the substrate G moves toward the blanket roll 40. Allowing the print job to proceed can substantially simplify the structure while significantly reducing the tact time required for the print job.

However, since any color resist initially selected from R, G, and B color resists is applied to the outer surface of the gravure roll 10 by the dispenser 30, the blanket roll 40 is applied to the outer surface of the gravure roll 10. In order to transfer the applied color resist, either one of the gravure roll 10 and the blanket roll 40 must be approached and spaced apart while moving independently of the other roll.

However, as described above, in the printing apparatus of the present embodiment, since the gravure roll 10 is designed to rotate only in place, the blanket roll 40 receives the color resist applied to the outer surface of the gravure roll 10. To do this, the blanket roll 40 must move independently of the gravure roll 10. That is, since the gravure roll 10 is disposed above the blanket roll 40 on the basis of the movable work stage 50, the blanket roll 40 is raised and lowered so that the blanket roll 40 is moved with respect to the gravure roll 10. It needs to be approached and separated. To this end, a blanket roll driving unit 42 for adjusting the pressure to raise and lower the blanket roll 40 independently is provided.

For reference, in the case of a printing apparatus for printing a large substrate (not shown), the pressure of the blanket roll 40 to the substrate G was adjusted by controlling the height of the work stage (not shown). However, when adjusting the pressure by the height control of the work stage in this way, there is a problem that the pressure can be changed for each part due to the deviation of the bending and tilt of the work stage, the blanket roll 40.

If the pressure is changed for each part during the printing operation, the width or height of the pattern printed on the substrate G may vary, and thus print quality may be deteriorated. By the way, in the case of a printing device for printing a large substrate (not shown), in order to adjust the pressure by the pressure of the cylinder only a rather large pneumatic device is required, but there is a practical problem that it is difficult to install in a clean room (clean room), The phosphorus pressure of the blanket roll 40 with respect to the board | substrate G was adjusted by controlling the height of a work stage.

Thus, in the present embodiment, the lifting and lowering operation of the blanket roll 40 is controlled through the blanket roll driving unit 42 for adjusting the pressure, and at the same time, the pressure of the blanket roll 40 with respect to the substrate G can be adjusted. .

As illustrated in FIG. 4, the blanket roll driving part 42 for adjusting the pressure may be coupled to both sides of the blanket roll 42 to move up and down together with the blanket roll 42 to be slidably moved to the frame part 75. And a first actuator 42b coupled to the first elevating block 42a to move up and down the first elevating block 42a.

A blanket roll rotating part 45 for rotating the blanket roll 40 is further coupled to the first lifting block 42a. The blanket roll rotating part 45 which may be applied to a motor or the like is moved up and down together with the first lifting block 42a. A sliding guide 43 is further provided between the first elevating block 42a and the frame 75 so that the first elevating block 42a can be slidably moved to the frame 75. Thus, when the first actuator 42b operates, the first lifting block 42a may be lifted up and down along the line of the sliding guide 43.

As the first actuator 42b, a pneumatic cylinder is applied in this embodiment. Of course, since the scope of the present invention is not limited thereto, it may be replaced by a hydraulic cylinder or a hydraulic pneumatic compound cylinder.

When the pneumatic cylinder is applied as the first actuator 42b as described above, the position at which the blanket roll 40 is lowered can be controlled by setting the air pressure of the pneumatic cylinder in advance, and thus the blanket pressed on the substrate G. It is possible to keep the pressure of the roll 40 uniform and constant at all times. In particular, through the adjustment operation of the pneumatic pressure, even in spite of the bending or inclination of the movable work stage 50, it is possible to apply a uniform phosphorous pressure to all parts of the substrate (G), thereby obtaining a uniform print quality. .

In addition, by setting the air pressure of the pneumatic cylinder in advance, even when the blanket roll 40 is raised to repair the color resist from the gravure roll 10, the pressure of the blanket roll 40 pressurized to the gravure roll 10 is uniform and Can be kept constant. As a result, although the gravure roll 40 is inclined, the blanket roll 40 can be disposed correspondingly, so that the color resist can be smoothly repaired.

Thus, when the length of the rod (not shown) is extended by the operation of the first actuator 42b by a separate control signal, the first lifting block 42a is raised and linked to the blanket roll 42. May contact the outer surface of the gravure roll (10). In this state, the blanket roll 42 receives the color resist from the gravure roll 10.

On the contrary, when the length of the rod (not shown) is reduced by the operation of the first actuator 42b, the first elevating block 42a is lowered and the blanket roll 42 is linked to the gravure roll 10. Spaced from the outer surface. In this state, the blanket roll 42 is pressed against the board | substrate G, and a printing operation progresses.

On the other hand, in the case of the present embodiment, although the blanket roll 42 is located below the gravure roll 10, the blanket roll 42 is a virtual virtually connected directly below the gravure roll 10, that is, vertically up and down It is not located on the line. Under these conditions, the blanket roll 42 must be moved up and down in the inclined direction in order for the blanket roll 42 to approach and be spaced apart from the gravure roll 10. To this end, as shown in FIG. 4, the first elevating block 42a and the first actuator 42b are provided to be inclined at a predetermined angle on the plate surface of the frame portion 75. However, since it is not necessarily the same as the drawing, if the blanket roll 42 is located directly below the gravure roll 10, the first elevating block 42a and the first actuator 42b is the frame portion 75 It is not necessary to be inclined at a predetermined angle from the plate surface of the).

As described above, the blanket roll 42 is lowered apart from the outer surface of the gravure roll 10 by the operation of the first actuator 42b, and then rotates by the blanket roll rotating part 45 at the position, In parallel with this, the movable work stage 50 is moved to the blanket roll 42, and the printing operation | work on the board | substrate G advances.

On the other hand, in the present embodiment is further provided with a stopper unit 46 for adjusting the pressure. The stopper unit 46 for adjusting the pressure maintains the lowering position of the blanket roll 40 precisely, and also prevents the blanket roll 42 from excessively lowering. In other words, the pressure adjusting stopper unit 46 serves to elastically limit the lowering position of the blanket roll 40.

In addition, the stopper unit 46 for adjusting the pressure may be used when adjusting the pressure by controlling the height of the blanket roll 40 with respect to the movable work stage 50. That is, after setting the stopper unit 46 for adjusting the pressure to the required height and maintaining a constant pressure, for example, the maximum pressure on the blanket roll 40, the printing operation is performed by adjusting the pressure by height control. .

The stopper unit 46 for adjusting the pressure is provided on both sides of the lower region of the blanket roll 40 along the longitudinal direction of the blanket roll 40. In this embodiment, the stopper unit 46 for adjusting the pressure is applied as an air bearing.

When the blanket roll 42 is lowered by the operation of the first actuator 42b while the air pressure of the pressure adjusting stopper unit 46 is set in advance, the contact pressure unit 47 coupled to the blanket roll 42 is provided. ) Is elastically contact and pressurized to the pressure adjusting stopper unit 46 to adjust its lowered position. Therefore, appropriate phosphorus pressure control of the blanket roll 40 with respect to the board | substrate G is attained. If the substrate G is thin or thick, under other circumstances, the print job position at which the blanket roll 42 is lowered can be easily adjusted by adjusting the air pressure of the stopper unit 46 for adjusting the pressure.

The movable work stage 50 is a portion where the substrate G is supported on the upper surface thereof, and moves to the printing operation position where the blanket roll 40 is mounted to interact with the blanket roll 40 to print on the substrate G. It is responsible for carrying out the work.

As will be described repeatedly, in the case of the printing apparatus for the small substrate G as in the present embodiment, it is not necessary to substantially mount many structures on the movable work stage 50. Therefore, using the movable work stage 50 in the print job is much more effective in terms of reducing the tact time.

The work stage (not shown) employed in the printing apparatus of a large substrate was mainly applied as a stone tablet. However, in this embodiment, the movable work stage 50 is made of a metal material. In the case of a metal material, there is an advantage that the movable work stage 50 can be more easily manufactured.

The plate surface of the movable work stage 50 has a plurality of air holes 51 for adsorbing the substrate G to the plate surface of the movable work stage 50 or for separating the substrate G from the plate surface of the movable work stage 50. Is formed. Instead of the plurality of air holes 51, a tiled air line (not shown) may be formed. Air is injected through the plurality of air holes 51 or air is sucked away, so that the separation and adsorption of the substrate G is allowed depending on the situation.

In order to move the movable work stage 50, the lower portion of the movable work stage 50 includes a movable rail unit 52 for moving the movable work stage 50 along the lengthwise direction of the blanket roll 40. It is further provided.

The movable rail unit 52 forms a movement of the work stage 50 by engaging the rail portion 52b to which the movable work stage 50 is coupled to the rail body portion 52a in a dove tail structure. The moving rail portion 52 is continuously formed from the front of the blanket roll 40 to the rear of the press roll 60. The moving rail unit 52 may be applied in a linear motion or the like.

Although not shown in detail, the movable rail stage 52 can move the movable work stage 50 in the X axis | shaft, Y axis | shaft, and (theta) axis with respect to the board surface of the board | substrate G. As shown in FIG. Of course, in order to enable such an operation, the moving rail unit 52 should be provided with a combination of a structure that enables movement in the X-axis, Y-axis, and θ-axis, such as a motor and a ball screw. The description will be cited and will be omitted here.

When the substrate G is loaded onto the upper surface of the movable work stage 50, the substrate G is aligned and loaded in advance. However, even if the substrate G is previously aligned and supported on the upper surface of the movable work stage 50, it is necessary to finally align the substrate G with respect to the blanket roll 40.

Alignment operation of the substrate G with respect to the blanket roll 40 includes image information of an alignment mark in which a sensing unit (not shown) located in front of the blanket roll 40 is marked on the substrate G. FIG. After obtaining, the controller (not shown) is performed by operating the moving rail unit 52. Of course, since the movement range of the movable work stage 50 with respect to the plate surface of the substrate G is about several millimeters, it is not substantially difficult to manufacture the moving rail unit 52.

The press roll 60 is provided to adjust the height of at least one of the R, G, and B patterns printed on the substrate G. That is, when at least any one of R, G, and B patterns is printed on the surface of the substrate G by the blanket roll 40, the heights of the patterns cannot be substantially uniform. Therefore, after at least one of the R, G, and B patterns is printed on the surface of the substrate G by the blanket roll 40, and once more pressurized of the substrate G using the press roll 60, The heights of the printing patterns printed on the surface of the substrate G can be mutually uniform, thus improving the print quality.

As such, the press roll 60 serves to pressurize the surface of the substrate G on which the printing pattern is formed in order to improve the print quality, and thus, the press roll 60 is more effective if the press roll 60 is provided. However, since the scope of the present invention is not limited thereto, the press roll 60 does not necessarily need to be provided in the present printing apparatus.

The press roll 60 has a structure substantially the same as that of the blanket roll 40. That is, to the press roll 60, the press roll drive part 62 for pressure adjustment and the press roll 60 which raise and lower the press roll 60 so that the press roll 60 may approach and space with respect to the movable work stage 50, and the press roll 60 The press roll rotating part 65 for rotating) is further coupled. These are mounted to the frame portion 75.

As shown in FIG. 4, the pressure roll adjusting press roll driver 62 is coupled to both sides of the press roll 60 to move up and down together with the press roll 60 to be slidably moved to the frame 75. And a second actuator 62b coupled to the second elevating block 62a and a second elevating block 62a for elevating the second elevating block 62a.

The press roll rotating part 65 is coupled to the second lifting block 62a to move up and down together with the second lifting block 62a. A sliding guide part 63 is further provided between the second lifting block 62a and the frame part 75 so that the second lifting block 62a is slidably moved to the frame part 75. And as described above, the second actuator 62b is applied to the cylinder.

However, while the pressure-controlling blanket roll driving unit 42 is inclinedly coupled in the frame unit 75, the pressure-rolling blanket roll driving unit 42 is coupled in a straight line in the vertical direction in the pressure-controlling press roll driving unit 62. Therefore, the press roll 60 is raised and lowered in the vertical direction instead of the inclined direction during the operation of the blanket roll driving unit 42 for adjusting the pressure.

Meanwhile, referring to FIGS. 3, 5, and 6, the doctor blade 20 is provided to remove unnecessary color resists among the color resists applied to the outer surface of the gravure roll 10 as described above.

The doctor blade 20 includes a knife holder 21 and a knife 22 coupled to the knife holder 21.

The knife holder 21 is a means for detachably engaging the knife 22. As shown in FIG. 6, the knife holder 21 may be formed of a body portion 21a and a cover 21b. Therefore, after removing the cover 21b with respect to the body part 21a, the knife 22 is arrange | positioned and the knife 22 can be easily installed by closing the cover 21b.

The knife 22 has a length substantially similar to the length of the gravure roll 10, and serves to scratch the outer surface of the gravure roll 10 in the state that the tip thereof is in contact with the outer surface of the gravure roll 10.

In this way, since the tip of the knife 22 is in contact with the outer surface of the gravure roll 10, when the color resist is applied by the dispenser 30 to the outer surface of the rotating gravure roll 10, it is intaglio form by the knife 22 The color resist applied to the remaining surface 10b except for the recess 10a may be naturally removed. Therefore, finally, the color resist can be accommodated only in the recess 10a (see FIG. 3B).

On the other hand, as described above, since the knife 22 has a substantially straight blade shape, the color resist, which is an ink solution provided between the gravure roll 10 and the knife 22, cannot stay for a predetermined time or a certain amount. . That is, when the color resist is provided between the gravure roll 10 and the knife 22 by the dispenser 30, the color resist flows down substantially immediately, thereby increasing the amount of color resist used and easily curing due to lack of solvent. The problem arises.

Thus, in order to improve such a phenomenon, the dam unit 90 is provided in at least one region of the doctor blade 20 in the present embodiment. The dam unit 90 serves to receive the color resist so that the color resist provided between the gravure roll 10 and the knife 22 can remain in a certain amount.

Since the dam portion 90 serves to receive the color resist provided between the gravure roll 10 and the knife 22, it may be coupled to the knife holder 21 or may be coupled to the knife 22. In the case of this embodiment, the dam part 90 is extended to both the knife holder 21 and the knife 22. As shown in FIG.

As shown in FIGS. 5 and 6, the dams 90 are disposed to be spaced apart from each other along the length direction of the knife 22 to receive a pair of primary barrier walls 91 and a knife ( A pair of secondary barrier walls 92 are provided on the outer side of the pair of primary barrier walls 91 along the longitudinal direction of 22 to accommodate the color resist together with the pair of primary barrier walls 91. do. Of course, the pair of secondary blocking walls 92 may be excluded in construction. However, if a pair of secondary blocking walls 92 are further provided as in the present embodiment, the color resist provided between the gravure roll 10 and the knife 22 may not be flowing, and thus may be more effective to stay a certain amount of time.

In providing the dam portion 90, if the dam portion 90 is made of a rigid plastic material, it may not be desirable to accommodate the color resist. Thus, in the present embodiment, the dam unit 90 is made of an elastic material such as rubber or silicon. When the dam unit 90 is made of an elastic material as described above, since the dam unit 90 of the elastic material is pressed while the tip of the knife 22 is in contact with the outer surface of the gravure roll 10, the gap between the dams 90 may be blocked. It may be more effective in receiving color resists. 6, a state in which the color resist is accommodated is schematically shown.

In the present embodiment, the volume of the pair of secondary barrier walls 92 is made relatively larger than the volume of the pair of primary barrier walls 91, but the scope of the present invention is not limited thereto. .

On the other hand, as mentioned in the prior art, in the conventionally known printing apparatus, since the doctor blade (not shown) had a structure that rotates toward the gravure roll 10 from the outside of the gravure roll 10 to the rotation position Accordingly, there was a problem that it is difficult to cope with various curvature changes of the gravure roll (10).

In order to solve this problem, in the present embodiment, the tip of the knife 22 may be disposed on the outer surface of the gravure roll 10 while moving in the normal direction (C, see FIG. 6) of the gravure roll 10. Further, a blade driving unit 92 coupled to the doctor blade 20 to drive the doctor blade 20 in a substantially straight direction is further provided.

Although a linear motor or the like may be applied as the blade drive unit 92, in the present embodiment, the tip direction of the knife 22 is moved in the normal direction C (see FIG. 6) so that the tip of the knife 22 can be moved in the normal direction of the gravure roll 10. The blade drive unit 92 is applied as the actuator 92 operating in the same direction as that of FIG. 6.

On the other hand, in order for the color resist applied to the outer surface of the gravure roll 10 to spread more smoothly and evenly to the outer surface of the gravure roll 10, the doctor blade 20 is not fixed in position and the length of the gravure roll 10 is fixed. You can move in the direction. Therefore, the research has been progressed, the known method is a method of moving the doctor blade 20 in the longitudinal direction of the gravure roll 10 using a cam structure.

However, in the case of using the cam structure in this way, there may be a problem that the constant velocity is not implemented well.

Thus, in the present embodiment, the doctor blade 20 is moved in the longitudinal direction of the gravure roll 10 (see arrows (a) and (b) of FIG. 5), but the blade swing portion is a type that is out of the conventional cam structure ( 94).

The blade swing portion 94 is provided along the longitudinal direction of the gravure roll 10, the ball screw shaft 94a to which the knife holder 21 is coupled, and the knife holder 21 of the ball screw shaft 94a. It includes a rotating portion 94b coupled to the ball screw shaft 94a so as to be moved along the longitudinal direction to rotate the ball screw shaft 94a in the forward and reverse directions. The rotating part 94b may be a motor directly coupled to the ball screw shaft 94a.

Thus, when the rotating part 94b operates to rotate the ball screw shaft 94a in the forward and reverse directions, the doctor blade 20 coupled to the ball screw shaft 94a is in the directions of arrows (a) and (b) of FIG. 5. Can be moved along. Therefore, the color resist applied to the outer surface of the gravure roll 10 can be spread more smoothly and evenly to the outer surface of the gravure roll 10.

A series of operations of the printing apparatus having such a configuration will be described below with reference to FIGS. 7 to 10.

First, as shown in FIG. 7, the substrate G is loaded onto the upper surface of the movable work stage 50 by a separate transfer device. When the substrate G is transferred to the upper portion of the movable work stage 50, the substrate G is injured at a predetermined height on the upper surface of the movable work stage 50 by the air pressure sprayed through the air hole 51. Subsequently, when the injection process of the air is stopped, the substrate G is loaded onto the upper surface of the movable work stage 50. As the air is adsorbed through the air hole 51, the substrate G may be adsorbed onto the upper surface of the movable work stage 50 to be fixed. After the substrate G is fixed to the upper surface of the movable work stage 50, the alignment work for the blanket roll 40 proceeds while being moved in the X-axis, Y-axis, and θ-axis by the moving rail unit 52. do.

After the alignment operation is performed, the dispenser 30 applies one color resist selected from R, G, and B color resists to the outer surface of the gravure roll 10.

Before any color resist selected by the dispenser 30 is applied, the blade driver 92 moves the doctor blade 20 so that the tip of the knife 22 is in the normal direction of the gravure roll 10 (C, FIG. 6). Move to the outer surface of the gravure roll (10). At this time, since the doctor blade 20 is provided with a dam 90 of elastic material, the dam 90 of the elastic material is pressed while the tip of the knife 22 is in contact with the outer surface of the gravure roll 10. Will block the gap.

In this state, the dispenser 30 applies any color resist selected from R, G, and B color resists to the region between the gravure roll 10 and the knife 22. Then, since the outside of the area | region between the gravure roll 10 and the knife 22 is shielded by the dam part 90, the apply | coated color resist will not be flowing but will be high for a fixed amount of time. In this manner, the gravure roll 10 is rotated in the state where the color resist is applied. At this time, the doctor blade 20 is based on the operation of the blade swinging part 94 by the arrows (a) and (A) of FIG. b) is moved along the direction. Due to this organic operation, the applied color resist is removed from the surface 10b except for the recess 10a of the intaglio form, so that the unnecessary color resist is removed, and finally only in the recess 10a. The color resist can be accommodated.

When the color resist is applied to the outer surface of the gravure roll 10, the blanket roll 40 is raised, as shown in FIG. 7, in order to repair the color resist to which the blanket roll 40 is applied. That is, the length of the rod (not shown) is extended by the operation of the first actuator 42b, and at the same time, the first lifting block 42a is raised while the blanket roll 42 is placed on the outer surface of the gravure roll 10. Contact. As such, when the blanket roll 40 is raised to contact the gravure roll 10, the color resist applied to the outer surface of the gravure roll 10 by the relative rotation between the gravure roll 10 and the blanket roll 40 remains unchanged. It is transferred to the sheet wound on the outer surface of 40.

Next, when the repair operation of the color resist is completed, as shown in FIG. 8, the length of the rod (not shown) is reduced again by the opposite operation of the first actuator 42b, and at the same time, the first lifting block ( The blanket roll 42 is lowered apart from the outer surface of the gravure roll 10 while 42a) is lowered. At this time, since the pressure adjusting stopper unit 46 is provided in the lower region of the blanket roll 42, the contact pressure portion 47 elastically contacts the pressure adjusting stopper unit 46 so that the blanket roll 42 It stops at the correct descent position for the print job, ie at the appropriate level of pressure on the substrate (G).

When the blanket roll 40 is disposed at the correct position for the print job, as shown in FIG. 9, the movable work stage 50 is moved toward the blanket roll 40 by the operation of the movable rail unit 52. At this time, the blanket roll 40 rotates to the blanket roll rotating part 45. As such, as the movable work stage 50 moves toward the blanket roll 40 and the blanket roll 40 rotates at the same time, any one of patterns selected from among R, G, and B patterns is printed on the surface of the substrate G. Retransmission.

Next, as shown in FIG. 10, the movable work stage 50 moves completely through the blanket roll 40 and toward the press roll 60. Subsequently, the movable work stage 50 is moved to the lower portion of the press roll 60, and at the same time, as the press roll 60 rotates, the press roll 60 presses the substrate G to print on the substrate G. The height of at least one of the R, G, B pattern is adjusted appropriately. Therefore, the heights of the printed patterns can all be made uniform, thereby improving print quality.

After the operation of the press roll 60 is completed, the substrate G is taken out and printing operation on a new substrate (not shown) is performed again.

As described above, according to the present embodiment, a process error is prevented by preventing the color resist applied to the outer surface of the gravure roll 10 from being unnecessarily excessive, while preventing the color resist from easily curing on the outer surface of the gravure roll 10. Can be prevented from occurring, and further, print quality can be improved.

In addition, according to the present embodiment, the doctor blade 20 may appropriately respond to various curvature changes of the gravure roll 10.

By implementing the stage supporting the substrate G as the movable work stage 50, not only the structure may be substantially simplified, but also the tact time required for the printing operation may be reduced.

In addition, according to the present embodiment, in particular, the tact time required for printing on a small substrate having a length / length of substantially 1 meter (m) or less can be significantly reduced.

In the above-described embodiment, the blanket roll is used to transfer the color resist in the gravure roll, but instead of the gravure roll, a gravure plate having a rectangular plate shape is provided, and the blanket roll is a gravure plate. It may be possible to transfer color resist from the substrate.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

As described above, according to the present invention, while preventing the unnecessarily excessive amount of color resist applied to the outer surface of the gravure roll, it is possible to prevent the phenomenon that the color resist is easily hardened on the outer surface of the gravure roll, thereby causing a process error. It can prevent and further improve print quality.

In addition, according to the present invention, the doctor blade can appropriately cope with various curvature changes of the gravure roll.

Claims (10)

A gravure roll in which any one of R (Red), G (Green), and B (Blue) color resists is applied to the outer surface by a dispenser; A doctor blade having a knife tip disposed on an outer surface of the gravure roll, and removing unnecessary color resist among color resists applied to the outer surface of the gravure roll; And And a dam unit coupled to at least one region of the doctor blade and accommodating the color resist so that the color resist provided between the gravure roll and the knife stays in a predetermined amount. The method of claim 1, The doctor blade further comprises a knife holder (Knife holder) to which the knife is detachably coupled, And the dam unit is coupled to at least one of the knife holder and the knife. The method of claim 2, The dam unit, the printing apparatus, characterized in that the elastic material is in close contact between the gravure roll and the knife is made of an elastic material to block the gap. The method of claim 3, And the dam part includes a pair of primary blocking walls arranged to be spaced apart from each other along the longitudinal direction of the knife to accommodate the color resist. The method of claim 4, wherein The dam unit may further include a pair of secondary barrier walls provided on the outer side of the pair of primary barrier walls along the longitudinal direction of the knife to accommodate the color resist together with the pair of primary barrier walls. Printing apparatus, characterized in that. The method of claim 5, And the volume of the pair of secondary blocking walls is greater than the volume of the pair of primary blocking walls. The method of claim 2, And a blade driving unit coupled to the doctor blade to drive the doctor blade in a substantially straight direction so that the tip of the knife can be disposed on the outer surface of the gravure roll while moving in the normal direction of the gravure roll. Printing apparatus. The method of claim 7, wherein And the blade driver is an actuator coupled to the knife holder to drive the knife holder in a linear direction. The method of claim 2, And a blade rocker coupled to the doctor blade and swinging the tip of the knife along the longitudinal direction of the gravure roll. The method of claim 9, The blade swing portion, A ball screw shaft provided along the longitudinal direction of the gravure roll to which the knife holder is coupled; And And a rotating part coupled to the ball screw shaft to rotate the ball screw shaft in the forward and reverse directions so that the knife holder can be moved along the longitudinal direction of the ball screw shaft.

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