JP2811274B2 - Box coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box coating apparatus for coating a rectangular box with a spray gun.

[0002]

2. Description of the Related Art Conventionally, colored plastic square boxes have been used as boxes for storing and transporting beverage products. Since the plastic box fades in sunlight, the faded layer is peeled off, painted and reused.

[0003] Since the box has projections such as ribs,
Painting is performed using a spray gun. In this case, it is necessary to paint uniformly over the entire surface while maintaining a proper distance between the spray gun and the painted surface.

[0004] As an apparatus for the above-mentioned coating, there is a programmable manipulator equipped with a spray gun, that is, a so-called coating robot in which a support base for intermittently rotating a box around its axis is added. . This apparatus is configured so that a spray gun is reciprocated and moved up and down in a horizontal direction in a plane parallel to a coating surface to perform coating. When a certain surface is painted, the box is rotated by 90 ° to paint the next surface.

In this case, every time the box is rotated by 90 °, the distance from the painted surface to the spray gun changes.
The position, movement path, spray timing, etc., of the spray gun are stored in advance by teaching.

[0006]

However, in the above-mentioned method, since the spray is applied to the stationary box by reciprocating the spray gun parallel to the coating surface, the spray is applied to both ends of the coating surface. Some of the paint sprayed from the gun are attached to the painted surface by being sprayed, and others are not attached because they are off the painted surface. For this reason, there is a problem that paint loss occurs in this portion, leading to a decrease in the adhesion rate of paint. The largest coating cost is the cost of paint, so the low coating adhesion rate is the biggest drawback. In addition, since the painting robot is used, the painting ability is low,
There is also a problem that it is expensive and requires maintenance.

The present invention has been made in view of the above-mentioned problem in a general-purpose machine called a painting robot, and has a high coating adhesion rate, that is, a coating machine having a reduced painting cost and a high painting ability, which is a simple and inexpensive dedicated machine. It is intended to provide a device.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is an apparatus for spraying paint on a side surface of a rectangular box, and supporting the box. A supporting base for continuously rotating the box around its axis, a cam having a profile approximating the square shape of the box, a cam provided in phase with the box, a cam follower contacting the cam, A slide that is connected to a cam follower and slides back and forth with respect to the box, and is connected to the slide;
A spray gun provided to face the box, and by rotating the cam synchronously with the support base, the distance between the side surface of the box and the spray gun is maintained substantially the same, and the cam The profile is the center of the cam
From the center of the box to the corner
Is shorter than the distance.

[0009]

According to the present invention having the above-described structure, by rotating the support, the box and the cam on the support rotate synchronously in phase with each other, and the cam follower contacting the cam uses the slide. Since it is connected to the spray gun through, the side of the box moves in the direction approaching the spray gun,
The cam follower abutting on the cam moves away from the side of the box and the spray gun keeps the same distance as the side of the box. Conversely, when the side of the box moves away from the spray gun, the cam follower moves toward the side of the box, and the spray gun keeps the same distance as the side of the box. That is, the spray gun performs the copying operation by the cam.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a box coating apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of the box coating apparatus, and FIG. 2 is an elevation view of the box coating apparatus. In FIGS. 1 and 2, reference numeral 1 denotes a colored plastic square box, and the box 1 is supported by a support 2.
The support 2 has a rotating shaft 3 connected to a motor M, is rotatable at a predetermined speed, and rotates the box 1 around its axis. Reference numeral 4 denotes a bearing that supports the rotating shaft 3.

A cam 5 is provided facing the support base 2, and the cam 5 is connected to a rotating shaft 7 rotatably supported by a bearing 6. The cam 5 has a profile similar to the square box 1 as shown in FIG.
And in the same phase. The rotating shaft 7 of the cam 5 is connected to the rotating shaft 3 of the support base 2 by a chain transmission including sprockets 8, 8 and a chain 9.
The cam 5 rotates in synchronization with the support base 2.

A cam follower 10 is in contact with the cam 5, and a slide 11 is connected to the cam follower 10. A pair of upper and lower spray guns 12, 12 arranged to face the painted surface of the box 1 are fixed to the slide table 11. The slide table 11 is urged in the direction of the box 1 by a tension coil spring 14,
The cam follower 10 connected to the slide base 11 is always in contact with the cam 5. As shown in FIGS. 1 and 2, the spray gun 12 has a nozzle opening set so as to be capable of spraying narrow width in the horizontal direction and spreading in a fan shape in the vertical direction.

Next, the operation of the box coating apparatus configured as described above will be described with reference to FIGS. Note that FIG.
FIG. 3 is a drawing in which a box 1 and a cam 5 installed adjacent to each other are drawn in a state where their centers are aligned for convenience of explanation.
When the box 1 is rotated around its axis by rotating the support 2, the cam 5 is rotated synchronously with the box 1 by a chain transmission mechanism including sprockets 8, 8 and a chain 9. Since the cam follower 10 abutting on the cam 5 is connected to the pair of upper and lower spray guns 12 via the slide table 11, as shown in FIG.
The cam follower 10 moves in the direction away from the side of the box 1 when the side of the box moves toward the spray guns 12 and 12, so that the spray guns 12 and 12 maintain the same distance as the side of the box 1. Become.

Conversely, when the side of the box 1 moves in a direction away from the spray guns 12, 12, the cam follower 10 moves in a direction approaching the side of the box 1, and the spray guns 12, 12 move in the direction of the box 1. Keep the same distance as the side of Therefore, the side of the box 1 and the spray guns 12, 12
During painting, the same distance will always be maintained.

On the other hand, as shown in FIG. 3B, a corner 1c between two side surfaces of the box 1 is
In the case where the cams 2 and 12 face each other, the profile of the cam 5 is such that the distance l ₁ from the center O of the cam 5 to the corner 5c is longer than the distance l ₂ from the center O of the box 1 to the corner 1c. Because of the short length, the spray guns 12, 12 come closer to the corner 1c of the box 1 than when they are on the side. Therefore, the spray of the paint can be prevented from spreading to both sides of the corner 1 c of the box 1, so that the corner 1 c of the box 1 can be painted similarly to the side of the box 1.

[0016]

As described above, according to the present invention, the spray gun merely moves toward or away from the box, and the box rotates continuously around its axis, so that the end of the painted surface is not affected. Since there is no part and most of the sprayed paint adheres, the adherence rate of the paint is improved. Therefore, the coating cost per box can be reduced and the coating ability can be improved.

Further, since the box coating apparatus of the present invention employs a copying mechanism using a plate cam, an expensive control device is not required, so that the apparatus can be simplified and inexpensive. Even if the shape of the box changes, it can be easily handled by changing the plate cam.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a box coating apparatus according to the present invention.

FIG. 2 is an elevation view showing one embodiment of the box coating apparatus according to the present invention.

FIG. 3 is an operation explanatory view of the box coating apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 box 2 support stand 3,7 rotating shaft 4,6 bearing 5 cam 10 cam follower 11 slide stand 12 spray gun

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B05B 13/02-13/04 B05B 12/08

Claims (1)

(57) [Claims] 1. A device for spraying paint on a side surface of a rectangular box to apply paint, comprising: a support table for supporting the box, and continuously rotating the box around its axis during coating; A cam having a profile approximating the square shape of the box, provided with the same phase as the box, a cam follower abutting on the cam, connected to the cam follower, and sliding in the front-rear direction with respect to the box And a spray gun connected to the slide table and provided toward the box. By rotating the cam synchronously with the support table,
The distance between the side surface and the spray gun of the box to keep approximately the same, the profile of the cam, until the corner portion from the center of the cam
Is shorter than the distance from the center of the box to the corner
Box coating apparatus, characterized in that the decoction.