JPH0366951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic painting method that can eliminate the number of paint machines in a car body painting line and reduce paint loss.

[Prior Art] In a conventional automatic painting line for automobile bodies, as shown in FIG. Gun a, b,
c is fixedly arranged.

The painting work using these side painting guns a, b, and c is performed on the upper part A and the middle part of the automobile body according to the fixed positions of the side painting guns a, b, and c, respectively, as shown in Figure 6. B and lower part C, and is controlled by a pulse signal sent from the conveying equipment, so that paint is sprayed from each side painting gun a, b, and c only during the period indicated by symbol X. .

[Problems to be Solved by the Invention] However, conventional automatic painting lines have the problem of increasing paint loss.

For example, when painting the body of a cab-over type truck as shown in Fig. 7, the area indicated by the symbol B is painted using side painting gun B located at an intermediate position. Paint is also sprayed into the space B1 in the same manner as in the body part _B0 , and the paint scattered in the air in this part is wasted. Furthermore, when painting a passenger car in two-tone color with upper and lower parts as shown in Figure 8, a masking part M is provided and the part indicated by the symbol B is painted with a side paint gun B at an intermediate position. However, in this case, the paint is sprayed on the masking part M as well as on the body part _B0 , so
Similarly, paint is wasted.

Also, as shown in Figure 7 or Figure 8, depending on the car model or the type of painting such as two-tone color painting, installing as many as three side paint guns on each side may result in excessive equipment. be.

In view of the above circumstances, it is an object of the present invention to provide an automatic coating method that can reduce the number of coating machines and reduce paint loss.

[Means for Solving the Problems] The present invention is an automatic painting method for automobile bodies in a painting line, in which one side painting gun reciprocates in the vertical direction with an automatically variable arbitrary stroke length. We installed one automatic painting device on each side of the vehicle body conveyance device, which can be fixed automatically at any position in the vertical direction, to match the painting area of the vehicle body. Provided is an automatic method for painting an automobile body, characterized in that painting is performed by a combination of reciprocating the side painting gun at the arbitrary stroke length and fixing it at the arbitrary position.

[Function] When using the automatic painting method of the present invention, it is possible to reciprocate the side painting gun in the vertical direction, and therefore, by adjusting the stroke of the reciprocating movement, the coating width in the vertical direction can be widened. It can be made narrower and can be fixed at any position during reciprocating movement. Therefore, paint can be sprayed only on the automobile body or only on necessary parts of the body with one paint machine on each side, and paint loss can be reduced.

[Example] Next, an example of the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram of the structure of an automatic painting apparatus used in one embodiment of the present invention, and FIGS. 2 to 4 are explanatory diagrams each showing an example of a painting operation by the automatic painting apparatus shown in FIG. 1.

The automatic painting apparatus shown in FIG. 1 includes side painting guns 1, which are arranged on both sides of the painting line in the direction of movement (in the direction of the arrow). The side painting gun 1 is configured to be reciprocated up and down by a reciprocating drive device 2 and can be fixed at any position during the reciprocating movement. Note that Z is an automobile body, and 3 is a conveyor for moving the automobile body Z in the direction of the arrow. The reciprocating drive device 2 includes a side painting gun 1.
A drive mechanism and a guide mechanism are provided for reciprocating the stroke up and down, and a controller is provided for changing the stroke to a longer or shorter stroke and for fixing it at an arbitrary position. The drive mechanism and guide mechanism need not be special, and may be constructed by known mechanical means. Further, the controller may also be constructed using known electrical or mechanical means.

Next, a coating example using the automatic coating device described above will be explained.

In the case of a cab-over type truck as shown in FIG. 2, the truck is divided into a cab part Z1 and a cargo bed part Z2, and when painting the cab part Z1, the side painting gun 1 is moved by a reciprocating drive device 2. Then, when painting the loading platform part Z2, the side painting gun 1 is fixed near the center of the side surface of the loading platform part Z2. In FIG. 2, a line L is a locus of movement of the side painting gun 1 relative to the automobile body Z, a point P1 means a starting point of painting, and a point P2 means an end point of painting (the same applies hereinafter).

In the above, when painting the driver's cab part Z1, the stroke of the reciprocating drive device 2 is controlled to be long S1 or short S2 in accordance with the upper edge of the tire house. By doing so, the paint is sprayed only on the body of the car, and there is no waste such as spraying the paint under the tire housing.

Furthermore, when painting the loading platform part Z2, since the side painting gun 1 is fixed near the center of the side surface, there is no waste of spraying paint on areas other than the body part.

FIG. 3 shows an example of two-tone painting of an automobile body Z such as a passenger car. In this example, a certain paint color is applied in a step-like narrow band shape [hatched area N1]. In this case,
In each of the painting sections R1, R2, and R3, the side painting gun 1 is fixed, and when moving from one painting section to the next, the side painting gun 1 is fixed.
move up or down.

In addition, in two-tone painting, when painting a certain paint color in a straight band shape [shaded area N2] as shown in FIG. 4, it is sufficient to fix the side painting gun 1 in the entire painting section.

[Effects of the Invention] When using the automatic painting method of the present invention, the number of coating machines can be reduced, and paint can be sprayed only on the automobile body or only on desired parts of the automobile body in accordance with the side shape or coating pattern of the automobile body. As a result, paint loss during painting can be reduced. Furthermore, because the number of paint machines required is small, the amount of paint and cleaning thinner that must be disposed of each time a color is changed is also reduced.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram of one embodiment of an automatic painting apparatus used in the method of the present invention, FIGS. The figure is an explanatory diagram of the structure of a conventional automatic painting device, FIG. 6 is an explanatory diagram showing painting work by a conventional automatic painting device, and FIGS.
The figure is an explanatory diagram for illustrating problems in conventional painting work. (Main symbols in the drawing), 1: Side painting gun,
2: Reciprocating drive device, Z: Automobile body.

Claims (1)

[Claims] 1. An automatic method for painting automobile bodies in a painting line, in which one side painting gun is capable of reciprocating in the vertical direction at an automatically variable arbitrary stroke length, and also automatically moves at any arbitrary stroke length in the vertical direction. One automatic painting device, which is fixedly fixed in position, is installed on each side of the vehicle body conveyance device, and the side painting gun is applied at the arbitrary stroke length according to the painting area of the vehicle body. An automatic painting method for an automobile body, characterized in that painting is performed by a combination of reciprocating movement and fixing at the arbitrary position.