JPH0443714B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a so-called paint pressure-feeding roller coating device that forcibly supplies paint into the interior of a rotatable coating roller having a porous core tube. It is related to.

(Prior Art and its Problems) The biggest problem in the paint pressure-feeding roller type coating device as described above is to make the paint supplied inside the roller flow out evenly over the entire area of the roller. In a typical paint pressure-feeding roller-type painting device, a paint supply pipe that also serves as a roller support shaft is arranged concentrically inside the painting roller, and the paint supply pipes are provided on the peripheral wall of the paint supply pipe at appropriate intervals in the length direction. The paint is supplied into the roller from a plurality of paint discharge holes, and the amount of paint discharged from each paint discharge hole of the paint supply pipe depends on the paint supply pressure and the inner diameter of the paint supply pipe. , is also related to the diameter of the paint discharge hole, the viscosity of the paint used, etc.
In general, there will be an extremely large number of locations near the paint supply end of the supply pipe, or there will be an extremely large number of locations near the paint supply end of the supply pipe and the opposite end of the supply pipe compared to other locations. or

If the amount of paint discharged from the paint supply pipe inside the roller changes greatly in the axial direction of the roller, naturally the amount of paint oozing out on the roller circumferential surface will also change greatly in the axial direction. , it is not possible to obtain an even, high-quality painted surface. To avoid this, conventionally, the paint discharge holes were not arranged at equal intervals in the roller axis direction, but were arranged so that the density of the discharge holes was higher in areas where the amount of paint discharged was smaller. The paint discharge amount distribution was configured to be averaged in the axial direction of the roller. However, when the painting roller is of a general length of around 30 cm, such conventional means are sufficiently effective, but when using large roller-type painting equipment such as those used in painting robots, etc. ,
When the length of the roller is more than twice the length of a typical roller, the conventional means of simply changing the density of the paint discharge holes as described above cannot sufficiently achieve the desired purpose. Can not.

Therefore, in painting equipment that requires long painting rollers, it is difficult to eliminate uneven coating even if paint is supplied from both ends of the roller. The conventional method was to arrange multiple short painting rollers in parallel to obtain the same effect as using long painting rollers, but such a configuration made the entire device expensive. In addition, there is a possibility that the boundaries between the surfaces painted by each painting roller may remain as uneven coating.

(Means for Solving the Problems) The present invention provides a roller-type coating device that can solve the conventional problems as described above. In addition, a cylindrical body 14 is provided with paint overflow ports 15 at appropriate intervals in the axial direction only in the upper part of the peripheral wall in a region where paint discharge ports 2b are provided at appropriate intervals in the axial direction of the fixed paint supply pipe 2. are externally fitted concentrically to form an annular paint reservoir tank 11 with both ends closed inside the cylindrical body 14, and both ends of the coating roller 1 having a porous core cylinder 8 on the peripheral wall, The paint reservoir tank 11 is enclosed within the porous core cylinder 8 and is rotatably supported on the fixed paint supply pipe 2 so that the paint is discharged from the paint discharge port 2b of the paint supply pipe 2. After the paint fills the paint storage tank 11, it overflows from the paint overflow port 15 on the upper side of the tank and reaches the paint roller 1.
It is characterized by the fact that it flows into the interior.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

1 is a coating roller, and 2 is a paint supply pipe that also serves as a roller support shaft. As shown in FIGS. 2 and 3, the coating roller 1 includes a supporting porous cylindrical body 3 made of punched metal or the like, caps 4 screwed onto both ends of the cylindrical body 3, and the cylindrical body 3. Multiple pieces (three pieces in the example shown) fitted into the
The painting roller bodies 5a to 5c have a general length of
c is similar to the conventional one, with open-cell plastic foam, flocked layer, etc. 7 on the outer peripheral surface of the porous cylindrical body 6.
A porous core cylinder 8 of the coating roller 1 is formed by the porous cylinder 6 and the supporting porous cylinder 3.

The paint supply pipe 2, which also serves as a roller support shaft, connects the roller support shaft portions 2a at both ends that rotatably support the painting roller 1 through the caps 4 at both ends, and connects both roller support shaft portions 2a in the axial direction. The roller support shafts 2a are connected to both ends of the support frame 9 and are connected to bearing members 10a and 10b that can be separated into upper and lower parts. It is removably fixed. Reference numeral 11 denotes a paint storage tank that is installed concentrically inside the painting roller 1, and forms a small annular gap 12 between it and the supporting porous cylinder 3, and also forms a small annular gap 12 around the paint supply pipe 2c. Both ends of a cylindrical body 14 forming an annular paint reservoir 13 are screw-fitted to the inner large-diameter threaded shaft 2d of the roller support shaft 2a, and the cylindrical body 14 has no holes in use. Paint overflow ports 15 are provided at appropriate intervals in the axial direction on the circumferential surface at the uppermost position. Elbows 16a and 16b are connected to both ends of the paint supply pipe 2, that is, the outer end of the roller support shaft 2a, and are connected to the paint pressure pump 18 via paint supply hoses 17a and 17b of the same length, respectively. be done. 19 is a paint tank.

In the coating apparatus configured as described above, the coating roller 1 is supported horizontally at a predetermined position via the support frame 9. At this time, the paint overflow port 15 in the internal paint storage tank 11 is located at the uppermost position of the tank. If the pump 18 is operated in such a state and the paint in the paint tank 19 is pumped from both paint supply hoses 17a and 17b to both ends of the paint supply pipe 2 through the elbows 16a and 16b, the paint will be transferred to the paint supply pipe 2. The paint flows into the annular paint reservoir 13 of the paint reservoir tank 11 from the paint discharge port 2b of the paint supply pipe 2c. And this tubular paint reservoir 1
After the paint is filled in 3, the paint overflow port 15 at the top
The paint overflows into the small annular gap 12 between the painting roller 1 and the tank 11. The paint that has flowed into this annular small gap 12 is transferred to the coating roller 1
Each roller body of the coating roller 1 is formed through the small hole of the porous core cylinder 8, that is, the small hole of the supporting porous cylinder body 3, and the small hole of the porous cylinder body 6 of each roller body 5a to 5c. It exudes to the flocked layers 7 of 5a to 5c. Therefore, by rolling the coating roller 1 on the surface to be coated, the surface to be coated can be continuously coated.

In the above embodiment, the supporting porous cylindrical body 3 was used to utilize three painting roller bodies 5a to 5c of general length, but a single long painting roller body with appropriate strength was used. When using the support porous cylinder 3, it is possible to omit the supporting porous cylinder 3. or,
It is also possible to arrange a plurality of cylindrical bodies 14 having different diameters concentrically to form a plurality of layers of annular paint reservoir 13 concentrically.

Furthermore, as shown in FIGS. 4 and 5, the amount of paint flowing out in the axial direction is determined through the paint discharge port 2b provided in the paint supply pipe 2c and the paint overflow port 15 provided in the cylindrical body 14 of the paint reservoir tank 11. It is desirable to reduce the axial spacing closer to the center so that the distribution is averaged. In the embodiment, the paint is supplied from both ends of the paint supply pipe 2c, but it may be supplied from one end. In this case, the axial distance may be reduced as the distance from the paint supply end increases. Of course, it is also possible to change the aperture diameter while keeping the axial distance between the apertures constant.

Although the paint discharge port 2b of the paint supply pipe 2c in the paint reservoir tank 11 is opened laterally, the opening direction is not limited.

(Operations and Effects of the Invention) According to the roller-type coating device of the present invention as in the above embodiment, the supplied paint is once stored in the paint reservoir tank inside the painting roller, and after the tank is filled, Since the paint overflows from the paint overflow port located at the upper part of the tank, even in a situation where the tank is long in the roller axis direction and a plurality of paint overflow ports are provided in the roller axis direction, the paint storage tank is connected to each paint overflow port. It acts as a pressure buffering means to average the paint pressure at each position, and the paint flows out from each paint overflow port in the axial direction of the roller at a substantially equal flow rate. Moreover, according to the present invention, paint can be supplied to multiple locations in the axial direction within the paint reservoir tank from the paint discharge port of the paint supply pipe disposed at the center of the paint reservoir tank. Compared to the case where paint is supplied from both ends or one end, the paint pressure in the paint reservoir tank can be averaged in the axial direction.

Therefore, even if the paint roller is very long, by using a paint reservoir tank with a diameter as large as possible compared to the inner diameter of the paint supply pipe, the paint can be supplied from the tank to the inside of the paint roller. This can be done evenly in the axial direction of the roller. As a result, the distribution of the amount of paint exuding on the circumferential surface of the painting roller is also averaged in the roller axial direction.
It becomes possible to perform good painting without unevenness.

[Brief explanation of drawings]

Figure 1 is an overall front view, Figure 2 is a vertical front view of the main parts, Figure 3 is a vertical side view of the same, Figure 4 is an external view of the paint supply pipe, and Figure 5 is a view of the paint reservoir tank. It is an external view of a cylindrical shape. 1...Painting roller, 2...Paint supply pipe that also serves as a roller support shaft, 2a...Roller support shaft portion,
2b...Paint discharge port, 2c...Paint supply pipe,
3... Porous cylinder for support, 4... Cap, 5a~
5c...Painting roller body, 6...Porous cylindrical body,
7... Flocked layer, etc., 8... Porous core tube of a coating roller, 11... Paint reservoir tank, 12... Annular small gap, 13... Annular paint reservoir, 14... Cylindrical body, 15... Paint spill outlet.

Claims (1)

[Claims] 1. A cylindrical body 14 provided with paint overflow ports 15 at appropriate axial intervals only on the upper part of the peripheral wall is concentrically removed in an area where paint discharge ports 2b are provided at appropriate axial intervals of the fixed paint supply pipe 2. An annular paint reservoir tank 11 with both ends closed is formed inside the cylindrical body 14 by fitting and fixing, and both ends of the coating roller 1 having a porous core tube 8 on the peripheral wall are connected to the porous core tube A roller type coating device in which the paint reservoir tank 11 is contained in the paint reservoir tank 8 and is rotatably supported on the outside of the fixed paint supply pipe 2.