JP2001314788A - Multicolor coating method and multicolor coating equipment - Google Patents

Abstract

(57) [Problem] To provide a multicolor coating method and a multicolor coating apparatus capable of coating an object to be coated in multiple colors. SOLUTION: A plurality of spray guns 22a, 22b, 22c to which paints of different colors are supplied are arranged to be shifted from each other in a vertical direction, and a work W conveyed by a chain conveyor 12 is rotated around a vertical axis. The work W is painted in multiple colors by spraying paints of different colors from the respective spray guns 22a, 22b, 22c. Thereby, the workpiece W can be painted in mutually different colors in the vertical direction. In a portion where different colors overlap each other, a substantially neutral blurred color is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor coating method and a multicolor coating apparatus capable of coating objects to be coated such as plastic molded products and metal molded products in multiple colors.

[0002]

2. Description of the Related Art Conventionally, as a coating apparatus for coating a plastic molded product such as an outer cover of a portable telephone, a spindle 2 is arranged at a predetermined interval on a conveyor 1 as shown in FIG. A known spindle type coating machine is known. In this spindle type coating machine,
There is an advantage that a large amount of the object to be coated can be efficiently coated. In the example of FIG. 5, an external cover of a mobile phone is supported as a workpiece W of the object to be coated on the spindle 2 via a holder 3, and the workpiece is transported in the direction of arrow A. The work W is supported so that its longitudinal direction is substantially horizontal. Then, while rotating the work W by the spindle 2, the three spray guns 4a, 4
By spraying the paint in b and 4c, the entire painted surface is painted evenly. In general, the outer cover of the mobile phone is painted in a multi-layered manner by a colored paint as a base and a transparent or translucent paint as a finish, and the same color is applied as a whole.

[0003]

However, it is not possible to paint the object in multiple colors simply by using a conventional coating apparatus for efficiently applying a large amount of the object to be coated, such as the spindle type, as it is. .

On the other hand, in view of the recent trend of diversification of fashion sense, if the outer cover of the above-mentioned portable telephone is painted not in a single color but in multiple colors to enhance the color variations, a great demand in the market can be stimulated. there is a possibility.

The present invention has been made in view of the above background, and an object of the present invention is to provide a multicolor coating method and a multicolor coating apparatus capable of coating an object to be coated in multiple colors. .

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of spray guns to which paints of different colors are supplied are arranged vertically offset from each other,
While rotating the object to be coated conveyed by a conveyor around a vertical axis, the spray gun sprays different colors of paint from each spray gun to coat the object with multiple colors.

According to a second aspect of the present invention, there is provided a conveying means for conveying an object to be coated, a rotating means for rotating the object to be rotated about a vertical axis, and a plurality of spray guns to which paints of different colors are supplied. The plurality of spray guns are arranged so as to be shifted from each other in the vertical direction.

In the multicolor coating method according to the first aspect and the multicolor coating apparatus according to the second aspect, the object to be coated is sprayed by a plurality of spray guns for spraying different color paints which are vertically displaced from each other. Paint while rotating around the vertical axis. Thereby, the object to be coated can be painted in mutually different colors in the vertical direction. In areas where different colors overlap, a substantially neutral color is applied.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a spindle type coating apparatus will be described below.
FIG. 1 is a plan view for explaining a schematic configuration of a coating apparatus 10 according to the present embodiment. Coating device 1 according to the present embodiment
Numeral 0 designates a sprocket 11 as a drive mechanism disposed at both ends and a chain conveyor 12 engaged between the sprockets 11 at both ends so as to form a ring in the horizontal direction. Further, in the process of transporting an object to be coated on the chain conveyor 12, the workpiece loading / unloading section 13,
Electrostatic blow 14, base coating booth 15, first infrared zone 16, finish coating booth 17, second infrared zone 18,
An ultraviolet curing zone 19 is provided.

The work take-in / take-out section 13 places a work, which is an object to be painted, on the chain conveyor 12 before painting, and places the work on which the painting has been completed on the chain conveyor 12.
It is a part taken out from. The electrostatic blow 14 is arranged next to the work take-in / take-out section 13 so as to remove dust from the work. The undercoat booth 15 performs undercoating of a work with a colored paint. The first infrared zone 16 and the second
The infrared zone 18 is configured by arranging a plurality of infrared light bulbs. The finish coating booth 17 performs a finish coating with a transparent or translucent UV paint. The ultraviolet curing zone 19 is located next to the second infrared zone 18 and has an ultraviolet light source.

Next, features of the coating apparatus 10 according to the present embodiment will be described. FIG. 2 is an explanatory diagram of a state in which a workpiece is multicolor-painted with a spray gun in the undercoating booth 15. The work W is, for example, a plastic molded product or a metal molded product, and is, for example, a front exterior cover or a rear exterior cover of a mobile phone. The illustrated example is a front exterior cover of a mobile phone. The work W is placed on the spindle 21 via the work holder 20 so that the longitudinal direction thereof is substantially vertical.
, And is conveyed in the direction of arrow B while rotating about the rotation axis of the spindle 21. Then, three spray guns 22 for spraying paints of different colors from each other.
The workpiece W is painted in multiple colors by a, 22b, and 22c.

The configuration and operation of multi-color coating of the work W will be described in more detail. FIG. 3 is an explanatory diagram showing a schematic configuration of multicolor coating by a spray gun. The spray gun disposed at the uppermost position in the vertical direction is the first spray gun 22a, and the spray guns disposed at the intermediate position and the lower position are the second spray gun 22b and the third spray gun 22c, respectively. . These three spray guns 22a, 22b, 22c are
3 so that the positions in the vertical direction are different from each other. Three spray guns 22a, 22b, 22c
Are connected to a first paint tank 24a, a second paint tank 24b, and a third paint tank 24c, respectively, which contain paints of different colors.
The paints of each color are supplied by 5b and 25c. For example, a first paint tank 24a contains a blue paint as a first paint, a second paint tank 24b contains a yellow-green paint as a second paint, and a third paint tank 24c contains a yellow paint as a third paint. It is assumed that The three spray guns 22a, 22b, and 22c have a compressor 2 attached thereto.
6, compressed air is supplied. The compressed air is supplied to the respective spray guns 22a, 22b, 22c by three electromagnetic valves 27a, 27b, 27c.

Each of the paint supply pumps 25a, 25b, 2
5c, compressor 26, each solenoid valve 27a, 27b, 2
7c is connected to the control panel 28, and electrical control is performed. When the main power supply of the control panel 28 is turned on, the compressor 26 is in a state of supplying compressed air at a constant pressure.
The paint supply pumps 25a, 25b, and 25c supply paint to the spray guns 22a, 22b, and 22c. In this state, the solenoid valves 27a, 27b, 27c
Is turned on, each spray gun 22 is compressed by compressed air.
a, 22b, and 22c are activated, and the paint is sprayed out from the nozzle tip.

On the other hand, a spindle 21 which is rotatable at a predetermined interval is provided on the chain conveyor 12. A spur gear 29 is disposed on the outer periphery of the spindle 21, and the spur gear 29 is configured to mesh with a rack gear 31 fixed to the apparatus frame 30. When the chain conveyor 12 moves from the back side to the front side with respect to the plane of FIG. 3, the spindle 21 also moves at the same time, the spur gear 29 rotates by the rack gear 31 fixed to the frame, and the spindle 21 also moves in the arrow C direction. Rotate. The work W is supported on the spindle 21 by the work holder 20, and the work W is conveyed while rotating from the back side to the front side of the drawing.

The chain conveyor 12 moves and the work W
Is transported to the painting position, for example, a work detection photoelectric switch (not shown) detects the work W, and based on this detection signal, the solenoid valves 27a, 27b, and 27c are turned on. Thereby, each spray gun 22a, 22b,
The paint is sprayed from the tip of the nozzle 22c to paint the work W in multiple colors. Blue paint is sprayed from the first spray gun 22a, and the upper part of the work W is painted in blue. Further, a yellow-green paint is sprayed from the second spray gun 22b, and the intermediate portion of the work W is painted in yellow-green. further,
Yellow paint is sprayed from the third spray gun 22c, and the lower part of the work W is painted in yellow. As described above, the coating apparatus 10 according to the present embodiment enables the surface of the workpiece W to be coated in a large number of colors with high efficiency.

FIG. 4 is a perspective view showing a state in which a front side outer cover and a back side outer cover of a mobile phone as a work W which is separately multicolored are assembled. Both exterior covers are painted from the top in three colors, the first color (blue), the second color (yellow-green), and the third color (yellow), and the overlapping part of each color is painted in a roughly neutral shade Is done. In the case of the exterior cover of the mobile phone, the front exterior cover and the back exterior cover may be integrally coated in an assembled state.

In the above embodiment, the structure in which the three spray guns 22a, 22b, and 22c are supported by the single spray gun support member 23 has been described. A configuration in which spray guns are separately provided along the direction may be adopted. Further, the number of spray guns is not limited to the above three, and two or more spray guns may be provided depending on the size of the work and the painting design. Particularly, depending on the shape of the work, a plurality of the same colors may be used so as to spray from different angular directions.

[0018]

According to the first and second aspects of the present invention, the object to be coated can be painted in different colors in the vertical direction. Further, in the overlapping portion of each color, it is possible to paint with a substantially neutral blurred color. Further, since the object to be coated is conveyed by the conveyor, the object to be coated can be efficiently and multi-color coated in a large amount.

[Brief description of the drawings]

FIG. 1 is a plan view of a coating line of a coating apparatus according to an embodiment.

FIG. 2 is an explanatory view of a state in which a work is multicolor-coated with a spray gun in a base coating booth.

FIG. 3 is an explanatory view showing a schematic configuration of multicolor coating by a spray gun.

FIG. 4 is a perspective view showing a state in which a front side outer cover and a back side outer cover of a mobile phone having a base coat are assembled.

FIG. 5 is an explanatory view of a conventional technique for performing painting while conveying an object to be painted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coating apparatus 12 Chain conveyor 20 Work holder 21 Spindle 22a, 22b, 22c Spray gun W Work

Claims (2)

[Claims] 1. A plurality of spray guns to which paints of different colors are supplied are displaced from each other in the vertical direction, and the object to be coated conveyed by a conveyor is rotated around a vertical axis while being sprayed from each spray gun. A multicolor coating method comprising spraying paints of different colors to apply the object to be coated in multiple colors. 2. A vehicle comprising: conveying means for conveying an object to be coated; rotating means for rotating the object to be coated around a vertical axis; and a plurality of spray guns to which paints of different colors are supplied. A multi-color coating apparatus characterized in that the spray guns are vertically displaced from each other.