JPS58177178A - Coater - Google Patents

Abstract

PURPOSE:To perform coating of uniform thickness to a workpiece to be coated, by bringing the hairs of a roll brush into contact with the top end of a paint- supply plate and rotating the roll brush to scatter paint. CONSTITUTION:When the top end of a paint-supply plate 5 is brought into contact with the hairs 9 of a roll brush 7 formed by radially uniformly flocking many hairs onto the periphery of a roll 8, the hairs 9 are bent with the rotation of the roll brush 7. Paint is supplied under this condition, so that the hairs 9 of the roll brush scatter the adherent paint downwards as splashes 13 uniformly distributed along the crosswise direction with the repelling power to return to their original vertical positions when the top end of the paint-supply plate comes off the haris 9. Thus, the workpiece to be coated can be extremely uniformly coated.

Description

[Detailed description of the invention] This invention relates to a coating device.

Conventionally, cement products such as roof tiles have generally been provided with a colored layer on their surfaces in order to make them more beautiful and colorful, as well as improve their durability.

Methods for applying colored slurry to the surface of cement excipients while the cement is uncured include the scattering method using a cement mortar gun or the scattering method using a rotating roll brush, but the former method may cause clogging, The latter method is generally used because there is a large amount of paint loss.

(&t77) The scattering method using a roll brush is as follows. That is, as shown in FIG. 1, the paint 2 prepared in the paint mixer 1 is transferred to the paint supply hopper 4 through the paint supply pipe 3, and then supplied from the paint supply hopper 4 to the paint supply plate 5. From there, the paint is allowed to flow down into the paint inflow opening s6 of the roll brush 7. The roll brush 7 is formed by planting a large number of bristles 9 on a roll 8 that rotates in the direction of arrow B. A cover 10 attached to the outside of the roll brush 7 is provided with an opening 11 for spraying paint. When the tips of the bristles 9 of the roll brush hit the baffle plate 12 attached to the upper edge of the roll brush and bend, and then come off the baffle plate 12, the bristles 9 of the roll brush 7 return to their original planted state. The paint is scattered downward as droplets 13 by the counter force for restoration, and the object 15 to be painted, which is transported by a belt conveyor 14 moving in the direction of arrow A, is coated. In the figure, 22 is a receiving mold.

In the roll brush paint supply system as described above, as shown in FIG. 2, the paint 2 supplied from the paint supply hopper 4 is diverted 17.
The tip 18 of the rounded and inclined paint supply plate 5 that spreads out and flows down exhibits a flowing state with #1''i uniform flow rate over its entire width, but when it leaves the tip 18 and hangs downward, several Dispersion flow 19.Q. Roll brush 7
On the other hand, if the paint is dropped in a dispersed flow like this, the amount of paint supplied to the roll brush will be concentrated in the axial direction, causing unevenness in the coating thickness in the width direction, making it difficult to apply uniformly. This becomes extremely difficult.

This invention was made in view of the above circumstances, and by bringing the bristles of the roll brush into contact with the tip of the paint supply plate, the paint can be applied to the roll in a uniform amount in the axial direction of the roll brush. To provide a coating device capable of coating an object to be coated with a uniform thickness by supplying paint to a brush and rotating a roll brush in this state to scatter the paint.

The coating device according to the present invention includes a roll brush in which a large number of bristles are flocked on the surface of the roll, a driving means for rotationally driving the roll brush, a paint supply hopper provided above the roll brush, and a paint supply hopper provided above the roll brush. The paint supply hopper is provided with a paint supply plate for supplying paint by flowing down to the roll brush, and the lower tip of the paint supply plate is embedded in the bristles of the roll brush, so that the lower It is characterized in that the paint supplied to the roll brush is splashed off by the repulsive force of the bristles of the roll brush that bend against the tip, allowing the object to be coated to be coated.

・:1 Next, this invention will be explained in detail.

FIG. 3 is a partially sectional side view showing one embodiment of the coating apparatus according to the present invention. In FIG. 3, the roll brush has a roll (iron core) 8 with a large number of bristles (made of nylon or the like) evenly planted in a radial manner on the surface of the roll (iron core) 8. A cover lO is attached to this roll brush 7.

The cover 10 is provided with a paint projection opening 11 extending downward from its side surface.

This roll brush 7 is designed to rotate in the direction of arrow B around the axis 2o.

The paint prepared in the paint mixer (not shown) is supplied to the paint supply hopper 4 through a paint supply pipe (not shown).

The paint supply hopper 4 is located diagonally above the roll brush 7.

Directly below the outlet of the paint supply hopper 4 is an inclined paint supply plate 5.
is provided. The paint supply plate 5 includes a paint distribution guide 16 for diverting and spreading the fallen paint.
is attached. As shown in Figure 4, paint supply plate 5
At the tip 18 of the paint supply plate 5, a side wall 21 is attached to the upper and right side edges of the paint supply plate 5 to prevent the paint from flowing out.
17.17The painted paint is spreading down the entire width.

Therefore, it can be said that the paint is uniformly distributed in the axial direction of the roll at this tip 18.

As shown in FIGS. 3 and 4, the tip end 18ti of the paint supply plate 5 is embedded in the bristles 9 of the roll brush 70 and is in contact with the bristles. Therefore, roll brush 70
As it rotates, the bristles 9 of the roll plan hit the tip s18 of the paint supply plate 5 and bend. At this time, the paint that is uniformly distributed in the width direction (corresponding to the axial direction of the roll brush) at the tip 18 of the paint supply plate simultaneously adheres to the bristles 9 of the roll brush. Therefore, the paint is uniformly supplied to the roll brush 7 in the axial direction. During this period, the roll brush continues to rotate 70 times, so when the bristles 9 come off from the tip 18 of the paint supply plate, the bristles 9 of the roll brush adhere due to the rebound force to restore the original planted state. The painted paint is scattered downward as droplets 13 uniformly distributed in the width direction.

Below this roll brush 7, move in the direction of the arrow -t-
The object to be coated 15 is being transported by a belt conveyor 14. Therefore, the object 15 to be coated is coated with a uniform thickness in the width direction of the object 15 by the droplets 13 flying from above.

That is, the present invention has the following features. Since the tip of the paint supply plate is embedded in the bristles of the roll brush, the paint can be evenly distributed in the width direction and adhere to the bristles of the roll brush. Therefore, paint can be uniformly supplied to the roll brush in its axial direction. Furthermore, this tip also functions as a baffle plate. Therefore, there is no need to separately provide a baffle plate.

In this manner, in the coating apparatus according to the present invention, the paint scattered by the roll brush is uniform in the axial direction of the roll brush, and therefore becomes droplets having a uniform density in the width direction of the object to be painted 150, and is sprayed onto the surface of the object to be painted 150. The coating is applied evenly.

Since the coating apparatus according to the present invention is configured as described above, the object to be coated can be coated very uniformly. Therefore, the product has excellent appearance quality and is beautiful with no variation.

Next, nine coating examples will be described in which a cement tile shaped body is coated using the coating apparatus according to the present invention.

The paint used was a mixture of white cement, pigment, and water in a paint mixer. The apparatus shown in Fig. 3 was used to coat the cement tile excipient. As a result, the coating film thickness on each part of the surface of the painted cement tile excipient was 0.
．． The thickness variation was extremely small within the range of 3 to 0.5 mm. Also, the appearance of the painted surface was beautifully finished.

On the other hand, as a comparative example, when the same cement tile excipient was coated using the apparatus shown in Figure 1, the coating film thickness on each part of the surface of the cement tile excipient after being painted was 0.1 to 2.
．． It showed a wide range of variation of 5 mm'.5. As a result, unevenness in the coating was noticeable and the appearance was lacking.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of a conventional coating device, Fig. 2 is a perspective view showing the state of paint flow on the paint supply plate in Fig. 1, and Fig. 3 is a part of an embodiment of the present invention. A cross-sectional side view, FIG. 4 is an explanatory diagram showing the relationship between the paint supply plate and the roll brush in FIG. 3. 4...Paint supply hopper 5...Paint supply plate 7...
・Roll brush 13・・Fist splash 15・・Object to be painted 16・・Paint diverting guide 18・・Paint supply plate tip part Patent applicant Matsushita Electric Works Co., Ltd. Agent Patent attorney Takehiko Matsumoto

Claims (1)

[Claims] (1) A roll brush having a large number of bristles flocked to the surface of the roll, a driving means for rotationally driving this roll brush, a paint supply hole provided above the roll brush, and a paint supply hole provided above the roll brush. A paint supply plate is provided for supplying paint to the roll brush by flowing it down, and the lower tip of the paint supply plate is embedded in the bristles of the roll brush, so that the lower tip hits the bristles of the roll brush. A coating device characterized in that the paint supplied to the roll brush is sprayed off by the repulsive force of the curled bristles of the roll brush to coat an object to be coated.