JPS6120598Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coating device that forms a coating layer of uniform thickness on the surface of an object to be coated. The present invention relates to a coating device that maintains a constant gap with the surface of a coated body and coats a uniform coating layer. Such a coating device is used, for example, in a photoreceptor coating device for electrophotography. Conventionally, a device for applying a photoreceptor to a certain thickness on the surface of an object to be coated has a means for supplying a coating liquid containing a photoconductive substance as a main component, and a device for applying a photoreceptor to a certain thickness on the surface of an object to be coated. A photoconductor coating device is known that includes a means for coating a photoreceptor. However, in conventional coating devices, as a means to uniformly apply the coating liquid flowing out from the coating liquid supply means onto the surface of the object to be coated, for example, tungsten is used to maintain a constant gap between the blade and the surface of the object to be coated. The gap was adjusted using wires such as wires, but this method may be simple if the object to be coated is a flat plate and a constant thickness is coated many times, or if the surface of the object to be coated is curved or curved. If the surface is rough or has large irregularities,
Since the wire was stretched in contact with the high part of the surface of the object to be coated, a coating layer of uniform thickness could not be obtained. Also, when changing the thickness of the coating layer, the wire must be replaced each time, and the thickness of the coating layer is determined by the diameter of the wire, so the thickness must be adjusted to match the type of wire. Only a coating layer was obtained. Furthermore, since the blade moves on the wire, there is a drawback that the blade surface is significantly worn and the surface of the object to be coated is damaged. Another coating method is to process the blade to the thickness of the coating layer, and the difference in height from the processed surface becomes the coating layer thickness, but this also causes changes in the shape of the surface of the object to be coated. On the other hand, since the movement of the blade does not follow, the uniformity of the coating layer is poor, and when changing the thickness of the coating layer, it must be replaced with another blade, and the number of blades must be made according to the thickness. There were some unavoidable flaws. The present invention improves the conventional coating apparatus and provides a coating apparatus capable of forming a uniform coating layer on the surface of an object to be coated. An embodiment of the present invention will be described in detail below. FIG. 1 is a perspective view showing the relationship between a tank as a coating liquid supply means for carrying out the present invention, a first blade mechanism, and a cylindrical object to be coated, and FIG.
FIG. 3 is a perspective view showing the relationship between the blade mechanism and the cylindrical object to be coated; FIG. 3 is a sectional view showing the arrangement of the device according to the present invention and a state in which the coating liquid is applied to the cylindrical object; FIG. The figure is a cross-sectional view showing the relationship between the blade and the thickness of the coating layer. In Fig. 1, a tank 1 is rotated and tilted around an axis B-B' passing through a point A near the tank opening, which has a groove shape with a width W ₁ , and the coating liquid L is poured through the tank opening 2. The tank 1 is configured in such a shape that the exposed surface area of the residual solution in the tank 1 remains approximately constant regardless of the rotational and inclination angle of the tank 1 . That is, its shape includes a front wall 3 including the point A and the axis of rotation B-B', a rear wall 4 whose inner wall surface is an arc C-C' with a radius R, and two fan-shaped side walls 5 with a radius R. , 6, and both side walls 5 and 6 are formed parallel to each other and perpendicular to the front wall 3 and the rear wall 4, and the whole has a fan-shaped box shape. 7 is a sliding plate with bearings 7a and 7 at both ends.
b, and is mounted via linear motion bearings 8 and 9 that are provided in the bearing portion and are slidable in the D direction. Furthermore, micrometer heads 10 and 11 that are slidable in the D direction are attached to the sliding plate 7 inside the bearing portion, and hold down the blade mounting plate 16. 16 is the blade mounting plate,
Arms 17 and 18 protrude from both ends 16a and 16b, and the arms 17 and 18 are slidably supported in elongated holes 19 and 20 in guide plates 21 and 22 fixed to the sliding plate 7. 21
and tension coil springs 24 and 25 hooked on spring hooks 26 and 27 fixed to 22 and arms 17 and 18, and micrometer heads 10 and 11 that can be moved slightly in the direction of arrow E;
A groove-shaped first blade 23 with a width W ₂ (W ₂ >W ₁ ) is attached to the upper part. 28 and 29 are rotary rollers made of radial ball bearings fixed to guide plates 21 and 22, and are always kept in a cylindrical shape by tension coil springs 12 and 13 hung on spring hooks 14 and 15 fixed to the bearings 7a and 7b. Shaped object 31
is being forced on. 31 is a cylindrical object to be coated, which is rotating in the F direction. In FIGS. 2 and 3, 32 is a sliding plate which has bearings 32b and 32c at both ends as in the first blade mechanism shown in FIG. 35, and slides in the direction of arrow G. Reference numeral 40 denotes a mounting plate, which is rotatably supported in a direction perpendicular to the cylindrical object 31 by a shaft 45 fixed to a radial bearing 33 in the center of the sliding plate 32, and is rotatable in the direction of arrow H. ing. Guide plates 41 and 42 are fixed to both ends of the mounting plate, and micrometer heads 43 and 44 are provided inside the guide plates to hold down the blade mounting plate 46. 46 is a blade mounting plate, and arms 47 and 48 protrude from both ends 46a and 46b, and the arms 47 and 48 are attached to the mounting plate 40.
Elongated holes 4 in guide plates 41 and 42 fixed to
Spring hooks 54 are slidably supported at 9 and 50 and fixed to the guide plates 41 and 42.
and 55, tension coil springs 52 and 53 hung on arms 47 and 48, and micrometer heads 43 and 44 capable of fine movement in the direction of arrow I, with a groove shaped in the upper part having a width W ₃ (W ₃ ≧W ₂ ). A second blade 51 is attached. 56
and 57 are rotating rollers made of radial ball bearings fixed to the guide plates 41, 42, and spring hooks 38 fixed to the bearings 32b, 32c.
and 39 are constantly pressed against the cylindrical coated body 31 rotating in the direction of arrow F by tension coil springs 36 and 37. Finishing 2nd
The second blade 51 of the blade mechanism section 58 is configured as described above, and as shown in FIG.
It is attached at an appropriate position at the front in the direction of rotation. In this embodiment, the relative mounting positions of the first blade mechanism section 30 and the second blade mechanism section 58 of the cylindrical object 31 are determined in consideration of the drying speed of the coating liquid, etc. It will be done. Next, the operation of applying a coating liquid to a cylindrical object will be explained with reference to FIGS. 1, 2, 3, and 4. First, a larger amount of coating liquid L than necessary to form a coating layer on the surface of the cylindrical object 31 is poured into the tank 1 , and when the motor rotates at a constant speed, the axis B -
It rotates and tilts around B', and a certain amount of the coating liquid is sent to the blade 23 of the first blade mechanism section 30 . Here, the coating liquid L is made to have a substantially width W ₂ and is flowed onto the surface of the cylindrical object 31 to be coated. Two rotating rollers 28 and 2 of the first blade mechanism section 30 are mounted on the surface of the cylindrical object 31 rotating in the direction of arrow F.
9 or tension coil spring 12 while rotating itself.
It is constantly pressed by the action of and 13,
Since it is possible to follow fluctuations due to undulations and eccentricity on the surface of the cylindrical object 31, the gap between the cylindrical object 31 and the tip of the first blade 23 is always kept constant, and the cylindrical The coating liquid L poured onto the surface of the object to be coated 31 is transferred to the first blade mechanism section 3
By setting the coating layer thicker than the desired coating layer thickness T using the micrometer heads 10 and 11 of 0.0, the coating is applied to a substantially constant thickness T-α, for example, 150 to 250 μm. Next, the second blade mechanism section 58 finishes the desired thickness T, for example, 100 to 200μ.
This second blade mechanism section 58 has a function of the first blade mechanism section 30 with a degree of freedom of rotation between the sliding plate 32 and the blade 51 in a direction perpendicular to the surface of the cylindrical object 31. Even if the shape of the object 31 to be coated is, for example, tapered, eccentric, or undulating, the gap between the tip of the blade 51 and the surface of the cylindrical object 31 is always maintained more precisely, and the micro- Meter head 43 and 4
By finely adjusting 4, the cylindrical object 3
One surface can be finished with a uniform coating layer thickness T. When the cylindrical object to be coated 31 rotates once, the coating liquid L in the tank 1 becomes empty and the supply by the first blade 23 ends and the blade 51 of the second blade mechanism section 58
The excess α of the coating liquid is removed downwards, so the first
A gap is created between the tip of the first blade 23 of the blade mechanism section 30 and the applied coating layer. After several rotations, the excess coating liquid α completely disappears, the final finished dimension T is achieved, and the rotation continues. In this embodiment, a tank formed in the shape of a fan-shaped box is used as a means for supplying the coating liquid, and by rotating and tilting the tank around the center of the fan-shaped tank, the coating liquid is supplied from the upper part to the first blade. , the supply amount was made constant regardless of the passage of time. However, in the present invention, other means for supplying the coating liquid, such as those shaped to be supplied from the bottom of the tank, are also used, and even with such supply means, according to the present invention, the coating liquid can be uniformly applied. can do. Furthermore, in this example, an example was explained in which the application was applied to a cylindrical object to be coated, but there is no restriction on the shape of the object to be coated.
The same applies to flat plates and curved plates. The field in which the coating device of the present invention is used is not limited to the type of coating liquid, and can be used immediately in any field where it is necessary to uniformly form a coating layer on the surface of an object to be coated. For example, it is most suitable as a coating device for electrophotographic photoreceptors. As described above, according to the apparatus of the present invention, the means for supplying the coating liquid and the first blade mechanism section and the second blade mechanism section that always keep the gap between the surface of the object to be coated and the tip of the blade constant are used. This makes it possible to obtain a uniform coating layer of the required thickness, regardless of the shape of the object to be coated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the relationship between a tank, a first blade mechanism, and a cylindrical object constituting an embodiment of the present invention, and FIG. FIG. 3 is a perspective view showing the relationship with a cylindrical object to be coated, FIG. 3 is a layout diagram of the apparatus according to the same embodiment, and a sectional view showing a state in which a coating liquid is applied to a cylindrical object to be coated, and FIG. 4 is a blade. In the cross-sectional view showing the relationship between the first blade and the coating thickness, a shows the relationship between the first blade and the coating thickness,
b shows the relationship between the second blade and the coating thickness, and c shows the state of the coating thickness finished by the second blade. 1 ... Tank, 7, 32... Sliding plate, 16, 4
6... Blade mounting plate, 23... First blade,
28, 29, 56, 57...Rotating roller, 30 ...
...First blade mechanism part, 31...Cylindrical object to be coated, 33...Radial bearing, 40...Mounting plate, 51...Second blade, 58 ...Second blade mechanism part, T, T+α...Coating Thick.

Claims (1)

[Claims for Utility Model Registration] 1. A coating liquid supply means for supplying a coating liquid to the first blade, and two rotating rollers that are constantly pressed against the surface of the object to be coated with an appropriate force, a first blade mechanism section that is maintained at a constant distance from the surface and whose blade tip gap can be adjusted by a fine movement mechanism; 1. A coating device comprising a second blade mechanism section that has a second blade mechanism section that has a rotational degree of freedom in a direction perpendicular to the surface of the object to be coated. 2. The coating device according to claim 1, wherein the coating liquid supplying means is a tank having a sector-shaped vertical section, and the coating liquid is supplied from the upper part of the tank by rotating and tilting the tank around an axis connecting the centers of the sector.