JPH0243971A - Method for applying coating to groove - Google Patents

Abstract

PURPOSE:To apply coating material to a groove formed on a curved surface to be coated by mounting an article to be coated on a jig, while a nozzle is inserted into a groove of said article to be moved linearly and then causing said article to revolve about a pivotal fulcrum located at the center of a curved surface part when coating is applied to the curved surface part of said article. CONSTITUTION:An article to be coated 10 which has a flat surface to be coated 10A and a curved surface 10B extending continuously from the surface 10A, wherein a groove 11 is formed across both the surfaces 10A and 10B, is mounted on a surface of a jig 13 for receiving an article to be coated comprising a flat surface part 13a and a curved surface part 13b extending continuously from the part 13a, wherein said jig 13 is disposed rotatably about a pivotal fulcrum 12 located approximately at the center of the curved surface part 13b. And the forward end of a nozzle 20 arranged movably in a direction of the surface for receiving the article is inserted into the groove 11 to spray coating material while being move along the groove 11 formed on the surface 10A and, when coating is applied to the groove 11 formed on the surface 10B, the jig 13 is caused to revolve about the fulcrum 12 by means of a driving device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a groove coating method suitable for application to objects having grooves to be coated, such as lenses of rear combination lamps of automobiles.

[Conventional technology]

For lenses conventionally used in automobile rear combination lamps, the lenses shown in Figure 4 (, ), (
As shown in b), it is known that thin grooves are formed on the surface to improve the design effect. That is, in the figure, 1 is a transparent or semi-transparent lens made of acrylic resin or the like, and 2 is a groove with a width of about 1 mm and a depth of about 0.5 mm formed on the surface of the lens 1. One end wraps around the side of the car body, forming part of the υ corner. The grooves 2 are usually painted with a suitable color to emphasize the design effect.

In this case, when painting the grooves 2, the lens 1 is generally coated with a coating mask 3 having slits 4 corresponding to the grooves 2.
, and the grooves 2 are spray-painted through the slits 4 using a spray gun 5.

[Problem to be solved by the invention]

However, in this painting method, if the groove width is narrow, it is difficult for the paint to penetrate into the grooves 2, resulting in uneven coating, making it difficult to obtain uniform quality, and requiring a skilled painting operator. Either there is a lot of scattering and the amount of paint used increases, or the work environment is bad.

Furthermore, there were many inconveniences, such as the need to manufacture the coating mask 3 for each model of the lens 1.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to insert a nozzle into the grooves of the object to be coated and move it in a straight line, thereby curing the object to be coated. By attaching it to a tool and rotating the object to be painted using the center of the curved surface as a rotational fulcrum when painting the grooves on the curved surface of the object, the grooves can be painted without using a coating mask. An object of the present invention is to provide a method for coating stripes.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has an object attachment surface consisting of a flat part and a curved part continuous to the flat part, and the curved part has an abbreviation of the curved part. The said workpiece mounting surface of the jig, which is rotatably arranged around the center as a rotational fulcrum, has a flat painted surface and a curved painted surface continuous to the flat painted surface, and extends over both of these painted surfaces. A workpiece on which grooves are formed is installed, and the tip of a nozzle arranged movably in the direction of the mounting surface of the workpiece is inserted into the groove, and the nozzle is inserted into the grooves formed on the flat surface to be painted. The paint is injected while moving along the grooves, and the jig is rotated about the pivot point by a drive device when painting the grooves formed on the curved surface to be painted.

[Effect]

The nozzle paints the grooves while moving along the grooves formed on the flat surface of the object to be painted, and when painting the grooves on the curved surface, the object rotates around the center of the curved surface. By rotating as a fulcrum, it paints the grooves on the curved surface.

〔Example〕

Hereinafter, the method of the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 is a block diagram of an apparatus used in the groove coating method according to the present invention, and FIG. 2 is a sectional view of the main parts. In these figures, 10 is a lens as an object to be painted fixed on a jig 13, and this lens 10 is provided continuously on a flat painted surface 10A and one end of this flat painted surface 10A, and has a predetermined curvature. It has a curved painted surface 10B, and narrow grooves 11 are formed on both of these painted surfaces 10A and 10B over almost the entire length.

The jig 13 is formed so that its upper surface matches the shape of the lower surface of the lens 10, so that the flat portion 131L
and a curved surface portion 13b following this, and the vicinity of the curved surface portion 13b is rotatably supported in the vertical direction by a shaft 12, and the side on which this shaft 12 is provided and The opposite end, that is, the end of the flat portion 13a is connected to the drive device 14. The driving device 14 includes nine hydraulic cylinders, one end 14& of which is rotatably supported on the device fixing part, and the outer end of the piston rod 15 is connected to the jig 13.
is pin-coupled to the end of the flat portion 13m.

Above the jig 13, both ends are supported by support blocks 1, respectively.
A pair of upper and lower guide rails 16A and 16B fixedly held by guide rails 5A and 15B are arranged parallel to the upper surface of the jig 13, and further above the guide rails 17 is a pair of left and right sub-blocks (Vc hooks) between the left and right sub-blocks 18A and 18B. The arrangement is handed out.

A horizontal shaft 19 is inserted and held between the pair of guide rails 16A, 16B so as to be movable in the longitudinal direction of the rails 16A, 16B, and a nozzle 20 is mounted at one end of this shaft 19, and a weight is mounted at the other end. 21 is disposed via an arm 22. The tip of the nozzle 20 is inserted into the groove 11 of the lens 10 and connected to the chain 17 by a connecting member 23. However, the nozzle 20 is connected to the paint supply machine 2 by a flexible pipe 24.
5.

The paint supply machine 25 is configured to suck up the liquid paint 26 that has filled the grooves 11 from the paint tank 27 and supply it to the nozzle 20, and adjusts the supply amount of the liquid paint 26 according to the grooves 11. A knob 29 is provided.

Note that the nozzle 20 can rotate around the axis 19, but is arranged at an angle of about 45 degrees with respect to the lens 10.
The tip of the nozzle 20 is pressed against the bottom surface of the groove 11 by a weight 21.

The chain 1T is intermittently reciprocated by a motor 2B, and a total of three limit switches 30A are provided on the upper surface of the chain 1T, which are controlled to open and close as the chain 17 runs.
308 and 300 are arranged. Among these limit switches 30A, 30B, and 30C, the limit switch 30A on the left end side in FIG.
By being moved by a switch operation piece (not shown) provided at T, the paint supply device 25 starts supplying the liquid paint 26. Limit switch 30B on the right side
stops the supply operation of the liquid paint 26, and the inner limit switch 30C temporarily stops the forward rotation of the motor 28 and drives the drive device 14 at the same time. Furthermore, a limit switch 30D is disposed corresponding to the jig 13, and this limit switch 30D operates when the jig 13 rotates by a certain angle, and stops the drive device 14 and simultaneously starts the motor 28. The circuit is configured to rotate it again in the forward direction. In addition, 40 is a stopper of the nozzle 20, and 41 is a cleaning container.

Next, the coating operation of the grooves 11 with the above configuration will be explained.

First, the lens 10 is set on the jig 13, and the amount of liquid paint 26 discharged by the paint supply device 25 is set in accordance with the width of the groove 11. Furthermore, the chain 1T is run by manual operation or motor drive, and the nozzle 20 is positioned at the starting position shown in the figure, that is, on the left end side of the lens 10, and its tip is placed in the groove 1 of the flat painted surface 10A of the lens 10.
Insert it into 1.

In this state, when the motor 28 is rotated in the forward direction and the chain 1T is run at a constant speed in the direction of arrow A, the nozzle 20 moves to the right together with the chain 17, and at the same time the IJ 30A is closed to operate the paint supply machine 25 and begin supplying the liquid paint 26. Therefore, the nozzle 20 sprays the liquid paint 26 supplied through the pipe 24 while painting the bottom surface of the groove 11 on the flat surface 10A. Nozzle 20
itself is connected to the chain 17 by a connecting member 23;
Since the shaft 19 is guided and held by the pair of guide rails 16A and 16B, it moves horizontally and paints the lens 10 up to the front of the curved painted surface 10B.

When the tip of the nozzle 20 reaches the boundary between the flat painted surface 10A and the curved painted surface 10B of the lens 10, the limit switch 30C is closed to temporarily stop the motor 2B and simultaneously drive the drive device 14. Then, the pivoting device [114 is held horizontally in order to operate to house the piston rod 15 in the cylinder, and the pivoting jig 13 is rotated counterclockwise in FIG. 3 about the shaft 12. be done. At this time, since the nozzle 20 is spouting the liquid paint 26 while maintaining the stopped state, the groove 11 portion formed on the curved painted surface 10B of the lens 10 is painted.

In this case, the tip of the nozzle 20 hardly moves in the vertical direction (due to the rotation of the jig 13), and the flat painted surface 1
Paint well under almost the same conditions as the 0A groove 11 takaso.

When the jig 13 is rotated by a predetermined angle and the coating of the grooves 11 on the curved surface 10B is completed, the limit switch 300 is closed by the jig 13, and the drive unit 1114 is stopped and the motor 28 is restarted. The nozzle 20 is rotated in the forward direction to move the nozzle 20 to the right by a predetermined distance, and a straight line is applied to the vicinity of the end 10C following the curved surface 10B. When the entire length of the groove 11 of the lens 10 is coated, the limit switch 30B is closed by a switch operating piece (not shown) of the chain 1T, and the supply of the liquid paint 26 to the nozzle 20 is stopped. let At this time, nozzle 20
When it comes into contact with the stopper 40 and is rotated by a predetermined angle clockwise against the heavy plate 21, its tip rises and is removed from the groove 11, and the cleaning container 41 is held until the next painting process.
It is immersed in thinner inside and cleaned, and is also used to prevent the paint from drying out.

Note that when the jig 13 is rotated by the drive device 14,
Although there is a risk that the liquid paint applied to the grooves 11 of the flat painted surface 10A of the lens 10 may flow along the grooves 11,
In that case, it may be forcibly dried using a dryer.

However, since the diameter of the tip of the nozzle 20 is set to be smaller than the width of the groove 11, there is a risk that the nozzle 20 will swing and meander in the left and right directions, but it will be pulled back to the neutral position by a pair of left and right tension coil springs. By holding it, meandering can be prevented.

Furthermore, by appropriately changing the shape of the tip of the nozzle 20, it is possible to accommodate various lenses having grooves 11 with different groove widths.

However, in the above embodiment, one nozzle 20 is used, but if a number of nozzles 2G corresponding to the number of grooves 11 are arranged in parallel and a plurality of grooves are painted at the same time, the coating time can be shortened. should be obvious.

〔Effect of the invention〕

As explained above, according to the groove coating method according to the present invention, the nozzle is inserted directly into the grooves of the object to be coated, so the amount of paint is reduced compared to the conventional coating method using a spray gun. There is no waste, it is economical, and the work environment is greatly improved.Moreover, it does not require skilled workers, and the painting work can be streamlined. Moreover, since the jig is rotated using the center of the curved surface as a rotation fulcrum, and the nozzle is moved linearly in the direction of the grooves, the grooves on the flat painted surface and the curved painted surface of the object to be coated are continuous. In addition, when using a spray gun, a painting mask and a special painting room were conventionally required, but with the present invention, such a mask and painting room are not required, and the assembly is easy. Its effects are extremely impressive, such as enabling painting during the process line.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the groove coating device used in the present invention, i
Figure 2 is an enlarged cross-sectional view of the main part, Figure 3 is a diagram showing the state of painting on the curved surface of the object to be painted, and Figures 4 (,) and (b) are perspective views showing the conventional painting method, and enlarged views of the main part. A cross-sectional view. 10...Lens (object to be painted), 10A...Flat painted surface, tOB...Curved painted surface, 11...Groove, 1\, 3...Jig, 13m ...Flat part, 13
b Placement, 20. Machine, 26. 30A to 30D. ◆Curved surface part, 14 life, fist, drive unit, nozzle, 25.. Paint supply/liquid paint, 28.. Motor, .φ limit switch. Fourth stage

Claims (1)

[Claims] The object to be painted of the jig has a mounting surface for the object to be painted consisting of a flat part and a curved part continuous to the flat part, and is rotatably disposed about the approximate center of the curved part as a rotational fulcrum. An object to be painted having a flat painted surface and a curved painted surface continuous to the flat painted surface and grooves formed across both these painted surfaces is installed on the object mounting surface, and the object to be painted is mounted. Insert the tip of a nozzle arranged so as to be movable in the surface direction into the groove,
Paint is injected while moving this nozzle along the grooves formed on the flat surface to be painted, and when painting the grooves formed on the curved surface to be painted, the jig is driven by a drive device to move the rotation fulcrum. A method for coating grooves, characterized by rotating the grooves around the center.