JPH0468146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coating device used in an inking device of a printing press, etc., and in particular to a coating liquid reservoir space created between a doctor blade and a coating roller. The present invention relates to a coating device that can prevent coating liquid from leaking from both sides.

(Prior art and its problems) As a technology for preventing ink leakage in this type of printing press, for example, Japanese Patent Application Laid-Open No. 56-157363, US Pat.
Technologies disclosed in P.2922364 and USP3730089 are known.

That is, JP-A-56-157363 discloses an inking device in which a doctor blade is directly pressed against an elastic ink forming roller to form a thin ink film. As a means to prevent ink from leaking from both sides of the reservoir space, an elastic sealing material such as leather is disposed between a seal plate attached to the end of the doctor blade and the end face of the elastic ink applicator roller. However, in this inking device, the coefficient of thermal expansion of each member that makes up the seal section differs, which causes dimensional changes in each member depending on temperature, and the leather wears out over time. However, there has been a problem in that ink may leak from the seal portion.

In addition, USP No. 2922364 discloses that a rotating elastic ink applicator roller and a metal roller are brought into pressure contact, and ink is collected in a V-shaped space formed by the two rollers, and the ink collected in the many depressions on the surface of the metal roller is removed. An inking device has been disclosed in which a thin film of ink is formed by transferring the ink to an elastic inking roller after passing through a pressure contact portion between both rollers. In this inking device, the seal plate for closing both sides of the ink reservoir space has a semicircular notch formed on the metal roller side with a concave curved surface having the same radius of curvature as the roller radius. The concave curved surface of the sealing plate is brought into close contact with the outer peripheral surface of the metal roller end over a semicircular range, and on the elastic inking roller side, the inner surface of the sealing plate is pressed from the side over the entire circumference of the roller end surface by a spring. There is. However, even in this inking device, there are differences in the thermal expansion coefficients of each member constituting the seal portion, and the dimensional change of each member differs depending on the temperature, and the end face of the elastic ink forming roller wears out as the operating time passes. Due to these reasons, there has been a problem in that ink leaks from the seal portion. Another problem is that a spring mechanism is required to press the seal plate against the end surface of the ink forming roller, making the structure complicated.

USP 3730089 also states that when a blade is brought close to an ink applicator roller made of metal or hard rubber and the ink applicator roller is rotated, the blade scrapes off excess ink. An ink visualization device is disclosed which forms an ink film on the surface of an ink applicator roller. In this ink visualization device,
The ink reservoir space is located above the ink form roller, and the side plate to prevent ink from leaking from both sides of the ink form roller has an arc-shaped notch with the same radius of curvature as the radius of the ink form roller and a lower part. The notch portion is brought into close contact with the outer peripheral surface of the end portion of the inking roller. However, even in this ink visualization device, there is a difference in the thermal expansion coefficient between the side plate and the roller that make up the seal section, and the dimensional changes of these members vary depending on the temperature, so ink may leak from the seal section. I had this problem.

The above explained about ink leakage from the side of the ink reservoir space in the inking device of a printing press.
Similar problems occur with coating devices other than inking devices.

(Objective of the Invention) The present invention has been made to solve the problems of the conventional example described above, and has a simple structure that prevents the coating liquid from leaking from the sides of the coating liquid reservoir space while preventing wear of the coating roller. It is an object of the present invention to provide a coating device that can prevent such problems.

(Means for Achieving the Object) The present invention includes sealing plates having a concave curved surface formed at the front end corresponding to the outer circumferential surface of a coating roller having an elastic surface, which are attached to both ends of a doctor blade for forming a coating film. The coating amount adjusting member is configured such that the concave curved surface of the seal plate is placed at a position facing the outer circumferential surface of the end portion of the coating roller, and the doctor blade is arranged so as to be freely advanced and retracted approximately in a radial direction with respect to the outer circumferential surface of the coating roller. In order to achieve the above object, the doctor blade is provided with a coating liquid reservoir space surrounded by the doctor blade, the seal plate, and the coating roller. When the lower end of the concave curved surface of the seal plate is brought into contact with the outer circumferential surface of the roller by pushing the seal plate against the applicator roller, there is a slight gap between the concave curved surface of the seal plate and the outer circumferential surface of the applicator roller. The shape of the concave curved surface is determined so that the gap size becomes gradually wider as the distance from the contact position of the concave curved surface with the outer peripheral surface of the roller increases.

(Function) According to the coating device of the present invention, when the doctor blade is pushed into the coating roller, a minute gap is formed between the concave curved surface of the seal plate and the outer peripheral surface of the coating roller, so that when the coating film is formed, A part of the coating liquid supplied onto the outer circumferential surface of the coating roller enters the gap, and this coating liquid acts as a lubricant at the contact area between the concave curved surface of the seal plate and the outer circumferential surface of the roller.
Wear on the outer peripheral surface of the roller is prevented. Further, since the gap is set to a minute size, when a highly viscous coating liquid such as printing ink is used, the coating liquid will not leak from the gap. Furthermore, the gap size is set so that it gradually widens as it moves away from the contact position of the concave curved surface with the roller outer circumferential surface, so it is difficult to push the doctor blade into the application roller in order to adjust the film thickness of the application liquid. Even when the amount is changed, the above-mentioned gap is always maintained, and wear and tear on the outer peripheral surface of the roller can be prevented without being affected by the film thickness of the coating liquid. In addition, the gap also serves to absorb the dynamic deformation of the outer circumferential surface of the elastic coating roller during the formation of the coating film, in other words, it also serves to relieve the pressing force of the concave curved surface of the seal plate on the outer circumferential surface of the roller. Contributes to preventing wear of the application roller.

(Embodiment) A. Configuration of inking device FIG. 2 shows a schematic diagram of a printing press equipped with an inking device which is an embodiment of the present invention. This printing press includes a blanket cylinder 1, a plate cylinder 2, and an impression cylinder 3, and an inking device 4 is detachably attached to the plate cylinder 2. The printing operation is carried out by wrapping the plate 5 around the plate cylinder 2, passing the continuous paper 6 between the blanket cylinder 1 and the impression cylinder 3, and then rotating each cylinder 1, 2, and 3 in the direction of the arrow in the figure. While feeding the paper 6 in the direction of the arrow in the figure, ink is supplied from the inking device 4 to the printing area of the plate 5, and the ink supplied to the plate 5 is further transferred onto the continuous paper 6 via the blanket cylinder 1. , print.

FIG. 3 shows a schematic sectional view of the inking device 4, and FIG. 4 shows a plan view of the same device. As shown in both figures, an ink applicator roller 7 and an auxiliary ink applicator roller 8 are rotatably attached to left and right frames 9, 9. Further, the kneading rollers 10 and 11 are rotatably attached to the left and right frames 9 and 9 so as to be swingable in the axial direction of the rollers. These kneading rollers 10 and 11 are configured such that their end faces are located outside of the end face of the inking roller 7 at their swinging end positions.

An ink amount adjusting member 12 is disposed at a rear position of the ink forming roller 7. Ink amount adjustment member 1
2 is a doctor blade 13 and left and right seal plates 1 attached to both ends of this doctor blade 13;
4, 14, and left and right fulcrum pins 15, 1 attached to the upper positions of these left and right seal plates 14, 14.
5, and these left and right fulcrum pins 15, 15,
By fitting into the left and right pin receivers 16, 16 provided on the left and right frames 9, 9, it is held swingably in the front-rear direction in FIG. 3 using the fulcrum pin 15 as a fulcrum. In this case, the left and right seal plates 14,1
A generally arcuate concave curved surface 14a is formed at the front end of the ink applicator roller 7 so as to substantially follow the outer peripheral surface of the ink applicator roller 7.
The roller is disposed at a position facing the outer circumferential surface of the roller at the end of the roller. As a result, the doctor blade 13 and
An ink reservoir space 17 is formed surrounded by the left and right seal plates 14, 14 and the ink application roller 7.

A blade pressing member 18 is disposed at a rear position of the ink amount adjusting member 12. The blade pressing member 18 includes an eccentric shaft 19 and left and right rollers 20, 20 rotatably fitted to the eccentric shaft 19,
These left and right rollers 20, 20 are rotatably attached to the left and right frames 9, 9 in contact with the back surface of the doctor blade 13. The blade pressing member 18 is driven to rotate forward and backward by a pulse motor (not shown), its rotation angle is controlled by an electronic circuit, and its rotation range is regulated by a sensor (not shown). ing. The blade pressing member 18 functions to adjust the amount of pushing of the doctor blade 13 onto the ink applicator roller 7 by its rotation, and as a result, adjust the thickness of the ink film formed on the outer peripheral surface of the ink applicator roller 7.

Next, the details of the configurations of the ink forming roller 7 and the ink amount adjusting member 12, which are key points of the present invention, will be explained. FIG. 5 shows a sectional view of a main part of the inking device 4 during formation of a thin ink film.

First, the doctor blade 13 has a thin plate member 131
The thin plate member 131 is composed of a rigid holding member 132 and a rigid presser member 133 that sandwich and hold the thin plate member 131 from above and below, leaving the tip of the thin plate member 131. It is placed so that it is facing the .
The thin plate member 131 is made of, for example, Swedish steel with a thickness of 0.1 to 0.5 mm. doctor blade 1
As shown in FIG. 6, the side end of the thin plate member 131 is extended further outward than the side end surface 132a of the holding member 132, and a seal plate is provided on the upper surface side of the extension. 14 is attached, and the side end of the presser member 133 (FIG. 5) is extended on the lower surface side, and the side end of the thin plate member 131 is secured from above and below by the extension of the presser member 133 and the seal plate 14. It is held in a pinched manner.

In this case, within the thickness region of the seal plate 14, the tip portion (ink scraping portion) of the thin plate member 131 protrudes forward beyond the lower end position of the concave curved surface 14a of the seal plate 14, as shown in FIG. Section T is provided. For example, when the lower limit of the amount of pushing of the thin plate member 131 into the ink forming roller 7 during ink film formation is set to 0.2 mm, the protrusion dimension is desirably set within the range of 0.05 mm to 0.15 mm. Furthermore, as shown in FIG. 1, the tip of the thin plate member 131 (ink scraping portion) also protrudes forward with respect to the presser member 133, and the protruding dimension is preferably within the range of 0.5 mm. desirable. When the protruding dimension is set within the above range, when forming a thin ink film, that is, when the ink forming roller 7 is rotated in the direction of the arrow while the doctor blade 13 is pressed against the ink forming roller 7 as shown in FIG. Even when the tip of the thin plate member 131 is subjected to a force that bends and deforms in the tangential direction of the roller outer circumferential surface 7a due to the rotation of the roller 7, the tip of the thin plate member 131 is bent between the seal plate 14 and the presser member 133.
As a result, the roller is held in a state in which substantially no bending deformation occurs in the tangential direction of the roller outer circumferential surface 7a. In addition, at the tip of the thin plate member 131, the leading edge on the ink introduction side and the leading edge on the ink outlet side are respectively curved, and the radius of curvature is 0.03 mm or more on the ink introduction side and 0.02 mm or less on the ink outlet side. It is desirable to set it.

As shown again in FIG. 6, at the tip of the thin plate member 131, the side edge 131a is located within the thickness area of the seal plate 14 and the ink form roller 7
It is cut so as to be located inward from the end surface 7b of the. In this case, the side edge 131a is located under the ink mixing roller 10 (FIG. 3,
It is located inward from the roller end face in FIG. 4).

As shown in FIG. 1a, the concave curved surface 14a of the sealing plate 14 is formed by pushing the tip of the thin plate member 131 into the roller 7 when the inking roller 7 is stationary, so that the lower end of the concave curved surface 14a is formed around the outer circumference of the roller. When brought into contact with the surface 7a, a small gap S is formed between the seal plate concave curved surface 14a and the roller outer peripheral surface 7a,
In addition, the gap size is set to gradually widen as it moves away from the contact position of the concave curved surface 14a with the roller outer circumferential surface 7a. Concave curved surface 14a
It is preferable that the ink forming roller 7 is formed into an arc shape, for example, and the radius of curvature thereof is set within a range of 1.01 to 1.1 times the radius of the ink forming roller 7.

On the other hand, the inking roller 7 is constituted by an elastomer roller made of, for example, rubber or plastic and has an elastic surface, as shown in FIG. The layer structure of the elastic portion of the roller 7 may be a single layer structure, or may be a multilayer structure in which the surface layer has a higher hardness than the inner layer. In this embodiment, a rigid rotating shaft 7 such as a metal round bar is used.
1 as a core material, the inner layer 72 is provided with a soft rubber layer, and the outer layer 73 is provided with a rubber layer harder than the inner layer 72, resulting in a two-layer structure. Both ends of the rotating shaft 71 are supported by rolling bearings (not shown) on the left and right frames 9, 9, and the rotating shaft 71 is supported by rolling bearings (not shown).
A drive gear (not shown) fixed to one end of the plate meshes with a plate cylinder gear (not shown) for gear drive. The surface hardness of the ink forming roller 7 is desirably set to 15° to 70° based on the rubber hardness specified by the JISA type. If the hardness is less than 15°, it will be difficult to form a thin ink film, while if the hardness exceeds 70°, it will not only be impossible to obtain a stable ink film, but also the ink will not be properly transferred to the printing plate. . A more preferred value for this hardness is 25°
~50°.

B. Operation of the inking device The operation of the inking device during printing is as follows. That is, as shown in FIG. 5, ink 21 having a viscosity of, for example, 3 poise to 1000 poise during printing is put into the ink reservoir space 17, and while rotating the ink form roller 7 in the direction of the arrow, the blade pressing member 18 is moved to a predetermined position. The doctor blade 13 is pushed into the inking roller 7 by a predetermined amount by rotating it by an angle. As a result, an ink film 21a having a thickness corresponding to the pushing amount of the doctor blade 13 is formed on the outer circumferential surface 7a of the ink form roller 7 in a region on the ink outlet side of the thin plate member 131. At this time, the ink 21 in the ink reservoir space 17 is rotated in a rod shape. The ink film 21a thus formed on the outer circumferential surface 7a of the roller is smoothed out uniformly in the width direction by a kneading roller 10 that swings in the axial direction, as shown in FIGS. 3 and 4, and then wrapped around the plate cylinder 2. It is transferred onto the image line of plate 5.
Also, at this time, the remaining roller outer peripheral surface 7a
The upper ink is mixed with a mixing roller 11 that swings in the axial direction.
After being made uniform again in the width direction as shown in FIGS. 3 and 4, the ink is transferred onto the image line of the printing plate 5 via the auxiliary inking roller 8. The ink remaining on the outer peripheral surface 7a of the roller without being finally transferred is
The ink is collected again into the ink reservoir space 17 and used again as printing ink.

(1) Effect of the concave curved surface 14a of the seal plate 14 FIG. 1a shows the relationship between the concave curved surface 14a of the seal plate and the roller outer peripheral surface 7a when the doctor blade 13 is pushed a predetermined amount into the ink form roller 7 in a stationary state. It is a figure showing the state of gap S formed between. FIG. 1b is a diagram showing the state of the gap S when the ink forming roller 7 is rotated to perform a printing operation from the state shown in FIG. 1a. In these figures, a curve B indicated by a dashed line represents the position of the outer circumferential surface of the ink form roller 7 before deformation. In this way, during the printing operation, the outer circumferential surface 7a of the ink forming roller 7
shows dynamic deformation as shown by the solid line in FIG.

In this inking device, as described above, the seal plate concave curved surface 14a is
A gap S is formed between the roller outer circumferential surface 7a and the ink 21 in the ink reservoir space 17 because the size of this gap S is set to be minute as described above. is the above gap S
There is no leakage to the outside. Also, since this gap S is provided, the ink form roller 7
The upper ink film 21a is formed by the swinging kneading roller 1.
0,11 (FIG. 3), when the roller is stretched in the axial direction, a small amount of the stretched ink comes to intervene in the gap S. The intervening ink acts as a lubricant at the contact portion between the seal plate concave curved surface 14a and the roller outer circumferential surface 7a, thereby preventing wear of the roller outer circumferential surface 7a at the contact portion. Moreover, the dimensions of this gap S are as shown in FIG.
Since the ink film 21a is set to gradually become wider as it moves away from the contact position of the concave curved surface 14a, the amount by which the doctor blade 13 is pushed into the ink form roller 7 is changed in order to adjust the film thickness of the ink film 21a. Even if the roller outer circumferential surface 7a and the concave curved surface 14a of the seal plate are always maintained, a gap S is always maintained between the roller outer circumferential surface 7a and the concave curved surface 14a of the seal plate, thereby preventing wear of the roller outer circumferential surface 7a and preventing ink leakage without being affected by the thickness of the ink film 21a. is planned. Furthermore, as shown in FIG. 1b, the gap S also serves to absorb the dynamic deformation of the outer circumferential surface of the roller during the formation of an ink film.
It also acts to relieve the pressing force of the roller 4a on the roller outer circumferential surface 7a, and contributes to preventing wear of the roller 12.

(2) Effect due to protrusion of the thin plate member 131 As shown in FIG. 6, in this inking device, within the thickness area of the seal plate 14, the tip portion (ink scraping portion) of the thin plate member 131 is attached to the concave curved surface 14a. Protrusion T protruding from the lower end position
has been established. For this reason, the ink form roller 7
The ink present in the gap S (FIG. 1) that tries to go around to the back side of the thin plate member 131 under the rotational force of This prevents the ink from running around from the back side of the thin plate member 131 within the thickness region of the seal plate 14.

(3) Effects of non-flexible support of the thin plate member 131 and bending of the front edge on the ink outlet side In this inking device, the tip of the thin plate member 131 is pressed against the seal plate 14 within the thickness area of the seal plate 14. The roller member 133 holds the roller in a substantially inflexible state in the tangential direction of the outer circumferential surface 7a, and the thin plate member 13
The leading edge of the ink outlet side at the tip of the tip is curved, and the radius of curvature is set to 20 μm or less. Therefore, even if printing continues for a long time, the growth of an ink pool formed on the back side of the tip end of the thin plate member 131 is suppressed, and only the back side is avoided.

(4) Effect of cutting the side edge of the ink scraping portion of the thin plate member 131 In this inking device, as shown in FIG. 6, the side edge 131a of the tip (ink scraping portion) of the thin plate member 131 is , the end surface 7 of the ink form roller 7 within the thickness area of the seal plate 14
It is cut at a position more inward than b. Therefore, the ink present in the gap S is removed from the thin plate member 1.
Even if the ink is scraped off by the tip of 31 and drips onto the protruding portion T from the reservoir side edge 131a, the dropped ink is caught by the ink mixing roller 10 (FIG. 3) disposed below, and the ink is applied. It is collected by roller 7. That is, it can be effectively used again as an ink for forming an ink film.
On the other hand, as shown by the dashed line in FIG. The ink scraped off by the thin plate member 131 on the outer peripheral surface 7a of the ink form roller is pushed outward along the tip of the thin plate member 131, and adheres to the end face 7b of the ink form roller 7, staining the end face of the roller. Or the tip corner portion 1 of the thin plate member 131
31b. At this time, kneading roller 1
Since the end face 0 (FIG. 4) is located inward from the tip corner portion 131b of the thin plate member 131, the dropped ink is not received by the kneading roller 10, and therefore the ink for forming an ink film is not absorbed. It will not be reused as such.

(5) Effect of the two-layer structure of the ink form roller 7 When the elastic layer of the ink form roller 7 has a single layer structure, as shown in FIG. 7a, the thin plate member 1
If the roller 7 is rotated in the direction of the arrow with the ink forming roller 7 pressed against the ink forming roller 7, the outer circumferential surface 7a of the roller may be deformed to cause a severe bulge as shown in FIG. When such a bulge occurs, the outer circumferential surface 7a of the ink form roller 7 is strongly rubbed against the concave curved surface 14a of the seal plate 14, and there is a possibility that the outer circumferential surface of the roller may be damaged. On the other hand, if the ink applicator roller 7 has a multilayer structure in which the surface layer is hard and the inner layer is soft, as shown in FIG. Therefore, there is no possibility that the roller outer peripheral surface 7a will be damaged by the concave curved surface 14a of the seal plate 14.

C Example Printing was actually carried out under the following conditions. That is, a two-layer rubber roller with an outer layer 73 having a rubber hardness of 30° and an inner layer 72 having a rubber hardness of 20° was used as the ink forming roller 7, and the diameter of the roller was set to 60.1 mm. The concave curved surface 14a of the seal plate 14 was finished in an arcuate shape, and its radius of curvature was 30.5 mm.
The doctor blade 13 is configured such that the tip of the thin plate member 131 protrudes from the lower end position of the concave curved surface 14a of the seal plate, and the protrusion dimension is set to 0.05 mm.
The protrusion dimension from the presser member 131 is set to 0.5 mm,
In addition, the front edge on the ink introduction side and the front edge on the ink discharge side at the tip of the thin plate member 131 were curved, and the respective radii of curvature were set to 0.06 mm and 0.01 mm. Further, the side edge 131a (FIG. 6) at the tip of the thin plate member 131 is located inwardly from the end surface 7a of the ink form roller 7 and away from the inner surface of the sealing plate 14 by 2.5 mm. formed in position. The ink 21 uses an ink with a viscosity of 500 poise, and while rotating the ink forming roller 7 at a peripheral speed of 0.6 m/s, the thin plate member 13 of the doctor blade is
1 was pushed in by 0.3 mm and printing was performed at a room temperature of 25°C.

The results show that even if you continue printing for about 100 minutes,
There was no ink leakage from the gap S formed between the concave curved surface 14a of the seal plate and the outer circumferential surface 7a of the roller, and there was no wear on the outer circumferential surface 7a of the roller due to the pressing of the concave curved surface 14a of the seal plate and the thin plate member 131.
No damage was observed to the roller outer circumferential surface 7a due to the pressing. Furthermore, within the thickness region of the seal plate 14, no ink pools were observed to grow on the back side of the thin plate member 131, and back dripping was avoided.

Note that the amount of protrusion from the lower end of the seal plate concave curved surface 14a at the tip of the thin plate member 131 is set to 0 mm and
When printing was carried out under the same conditions as above with the setting to 0.15 mm, it was found that when the setting was 0 mm, the side edge 131a (the sixth
If the ink drips from the side edge 131 in the printing time of about 60 minutes when set to 0.15 mm,
A drop of ink dripped from a. However,
In either case, the dropped ink was received by the ink mixing roller 10 disposed below and collected by the ink forming roller 7.

D Modification In the above embodiment, a case was described in which one ink reservoir space 17 was formed over almost the entire length of the ink form roller 7, but a seal plate having the same structure as the seal plate 14 was placed at an intermediate position of the doctor blade 13. It is also effective in preventing ink from mixing between adjacent ink reservoirs when a plurality of ink reservoir spaces are formed. This method is called a color separator, and can be applied to multicolor sticker printing machines, rainbow printing, etc. Further, in the above embodiment, the ink amount adjusting member 12 is formed by being divided into the thin plate member 131, the holding member 132, the pressing member 133, and the seal plate 14, but the ink amount adjusting member is not necessarily limited to the above configuration. It's not a thing. In addition to inking devices for offset printing, the present invention is also applicable to inking devices for general printing presses such as letterpress printing and lithographic printing. It can also be widely applied to so-called coating devices that form coatings.

(Effects of the Invention) As described above, according to the coating device of the present invention,
The applicator roller is constituted by an elastic roller, and a minute gap is formed between the concave curved surface of the seal plate and the outer circumferential surface of the applicator roller, and the gap size increases as the distance from the contact position of the concave curved surface with the roller outer circumferential surface increases. Because it is set so that it gradually widens,
It has a simple structure without using a spring mechanism for biasing the seal plate, and prevents wear on the application roller.
This provides the effect of preventing leakage of the coating liquid from the sides of the coating liquid reservoir space.

[Brief explanation of drawings]

Figure 1a shows the gap formed between the concave curved surface of the seal plate and the outer peripheral surface of the roller when the ink form roller is at rest, and Figure 1b also shows the gap formed when the ink form roller rotates. FIG. 2 is a schematic sectional view of an offset printing press equipped with an inking device according to an embodiment of the present invention, FIG. 3 is a schematic sectional view of the inking device, and FIG. 4 is a plan view of the inking device. 5 is a plan view of the inking device during ink film formation, FIG. 6 is a horizontal sectional view of the main part of the inking device, FIG. 7a is a diagram showing further dynamic deformation of the roller, and FIG. 7b is It is a figure which shows the dynamic deformation of a two-layer roller. 4... Inking device, 7... Ink application roller,
12... Ink amount adjustment member, 13... Doctor blade, 14... Seal plate, 14a... Concave curved surface, 1
7... Ink reservoir space, 21... Ink, 72...
...Inner layer, 73...Outer layer, 131...Thin plate member, 1
31a...side edge, 133...pressing member.

Claims (1)

[Scope of Claims] 1. A coating amount adjusting member is constructed by attaching a sealing plate having a concave curved surface at its front end to correspond approximately to the outer peripheral surface of a coating roller having an elastic surface to both ends of a doctor blade for coating film formation. The concave curved surface of the seal plate is disposed at a position facing the outer circumferential surface of the end portion of the applicator roller, and the doctor blade is disposed so as to be movable approximately in a radial direction relative to the outer circumferential surface of the applicator roller. In a coating device in which a coating liquid reservoir space is formed surrounded by a doctor blade, the seal plate, and the coating roller, when the coating roller is stopped rotating, the doctor blade is pushed into the coating roller to remove the concave curved surface of the seal plate. forming a slight gap between the concave curved surface of the seal plate and the outer circumferential surface of the applicator roller when the lower end thereof is brought into contact with the outer circumferential surface of the roller;
A coating device characterized in that the shape of the concave curved surface is determined so that the gap size gradually becomes wider as the distance from the contact position of the concave curved surface with the outer circumferential surface of the roller increases. 2. The coating according to claim 1, wherein a coating liquid scraping portion of the doctor blade located within a thickness region of the seal plate protrudes from a lower end position of a concave curved surface of the seal plate. Device. 3. A side edge of the coating liquid scraping portion of the doctor blade is located inside the end surface of the coating roller within the thickness region of the seal plate. coating equipment. 4. The coating device according to claim 2 or 3, wherein the coating roller has a multilayer structure in which the surface layer has a higher hardness than the inner layer. 5. The ink scraping portion of the doctor blade located within the thickness region of the seal plate is held in a substantially inflexible state in a tangential direction of the outer circumferential surface of the application roller by the seal plate and the pressing member; Claims 2 to 4 are characterized in that the leading edge of the ink scraping portion on the ink outlet side is curved, and the radius of curvature thereof is set to 20 μm or less.
The coating device according to any one of paragraphs. 6. Claims 1 to 5, characterized in that the applicator roller is an ink forming roller.
The coating device according to any one of paragraphs.