JPH1034025A - Dot pattern coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To coat large dot patterns having a uniform grain size by forming a bent part which is bent inward on the large-diameter side of a tapered rotary cylindrical body, forming plural pieces of coating material discharge holes at the rotary cylindrical body near the neck part of this bent part and disposing a coating material supplying pipe to face the small-diameter size of the rotary cylindrical body. SOLUTION: A spindle 2 which is rotationally driven by an air motor is supported to face downward at the center of a coating device body 1 and the rotary cylindrical body 3 is fixed to face downward at its front end. The rotary cylindrical body 3 is formed to a tapered shape flaring downward and the bent part 4 curved to the inner side is formed over the entire circumference at the end edge of the large-diameter side of the cylindrical body. Plural pieces of the coating material discharge holes 5 are formed near the neck part thereof. Further, the coating material supplying pipe 12 is inserted into the opening 11 on the upper side of the rotary cylindrical body 3 and the coating material dropped from the front end thereof is dropped onto the slope of a holding ring 8 and is accumulated at the corner of the bent part 4 through a through-hole 7 by centrifugal force, following which the coating material is released outside from the coating material discharge holes 5. As a result, the coating of the dot patterns having the uniform grain size is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a relatively large and uniform spot pattern on an object to be coated.

[0002]

2. Description of the Related Art Conventionally, in order to paint a spotted pattern, paint supplied from above a rotary cylinder having a large number of vertical grooves formed on an inner peripheral surface is spread while sticking to the inner peripheral surface by centrifugal force. Although it was designed to fall down along the groove and to fly out as particles from the lip and apply it to the object to be coated, a rotating cylindrical body was used to paint a large spot pattern with a particle size of about 1 to 3 mm. It is necessary to reduce the rotation speed of the paint, and then the paint becomes a film after being released from the edge of the mouth and becomes a particle, so that the particle size greatly varies.

[0003]

An object of the present invention is to provide a coating apparatus capable of coating a relatively large spot pattern having a uniform particle size.

[0004]

Means for Solving the Problems, Functions and Effects As means for solving the above-mentioned problems, the invention of claim 1 is directed to a method in which a tapered rotary cylinder is provided with an inner peripheral portion on the entire circumference of a large-diameter end edge. A bent portion is formed, and one or a plurality of paint discharge holes are formed in a rotary cylinder near the base of the bent portion, and a paint supply pipe faces a small diameter side of the rotary cylinder. Then, the paint supplied from the paint supply pipe flows to the large-diameter end side along the inner peripheral surface of the rotating cylinder by centrifugal force, and the paint is discharged after being collected in a corner formed by the rotating cylinder and the bent portion. It is released as streaks from the holes, granulated by surface tension, and applied to the object to be coated.By coating the paint discharge holes, painting a spot pattern with a relatively large diameter and uniform size And the invention of claim 2 is the invention of claim 1 Since the nozzle protrudes from the paint discharge hole, the paint adheres around the paint discharge hole on the outer peripheral surface of the rotary cylinder, and this scatters as fine particles from the periphery of the rotary cylinder, or intermittently intersperses with the paint discharge hole. It is possible to prevent the size of the speckles from varying due to entering the paint discharged from the nozzle.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a coating apparatus main body,
At the center thereof, a main shaft 2 rotationally driven by an air motor (not shown) is supported downward, and a rotating cylinder 3
Is fixed downward.

The rotating cylinder 3 has a tapered shape that spreads downward, has a bent portion 4 that is bent inward at the lower end edge, and one paint discharge hole 5 is formed laterally at the base thereof. ing.

[0008] A holding ring 8 having a plurality of through holes 7 formed on the lower surface thereof is fitted on the inner periphery of the rotary cylinder 3, and a holding plate 9 is provided.
And is fixed to the main shaft 2 by a countersunk screw 10.

A paint supply pipe 12 is inserted into the upper opening 11 of the rotary cylinder 3, and the paint dropped from the tip of the pipe 11 falls on the slope of the holding ring 8 and passes through the through hole 7 by centrifugal force to rotate the rotary cylinder 3. After flowing down the inner peripheral surface of the body 3 and accumulating at the corners of the bent portion 4, it is discharged to the outside through the paint discharge holes 5.

The released paint a is, as shown in FIG.
Initially, it forms a streak, becomes granular due to surface tension, and is swung into a circle.

At this time, since the coating density of the coating material a is high at both sides parallel to the running direction of the coating material b, the coating material b is formed using only the central portion of the coating range of the coating material a. Paint.

The particle size of the coating material a is determined by the size of the coating material discharge hole 5, so that a spot pattern having a large diameter and a uniform size can be applied.

FIG. 3 shows a structure in which a plurality of paint discharge holes 5 are formed in the rotary cylinder 3 so that a large amount of paint can be discharged and coating efficiency can be improved.

FIG. 4 shows a configuration in which a nozzle 13 projects from the paint discharge hole 5 of FIG. 3, and paint adheres around the paint discharge hole 5 on the outer peripheral surface of the rotary cylinder 3, which is Of the paint discharge holes 5 intermittently
It is possible to prevent the size of the speckles from varying due to entering the paint discharged from the nozzle.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of an example of use.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a sectional view of another embodiment.

[Explanation of symbols]

 2: Main shaft 3: Rotating cylinder 4: Bending portion 5: Paint discharge hole 12: Paint supply pipe

Claims (2)

[Claims] An inwardly bent portion is formed on the entire circumference of a large-diameter side edge of a tapered rotary cylindrical body, and one or more bent portions are provided on the rotary cylindrical body near the root of the bent portion. And a paint supply pipe having a paint supply pipe facing the small diameter side of the rotary cylinder. 2. The spot pattern coating apparatus according to claim 1, wherein a nozzle protrudes from the paint discharge hole.