JP2001121048A - Apparatus and method for coating small article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for coating small articles whereby the coating efficiency is improved and the unevenness in thickness of a coating film is reduced. SOLUTION: Objects 9 to be coated, such as outer handless, are attached to mounting fixture 8 rotating around the rotation shaft 7 installed horizontally as the center of rotation and, while the fixture 8 is rotating, a coating material is sprayed on the objects 9 from a coating material spray nozzle 20 moving in the direction of the rotation shaft. Thus, the front and back sides of the object are coated. Since the center of rotation is in horizontal direction, the object is coated evenly in the left and right directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus and a coating method for small parts which need to be coated on the entire front and rear surfaces such as an outer handle of an automobile.

[0002]

2. Description of the Related Art Conventionally, in painting small parts such as an outer handle of a car, a plurality of small parts to be coated are suspended on hangers suspended on a conveyor, and a painting robot or a painting work is performed. This is often done by a person spraying paint around the area with a spray gun. When a large body to be coated, for example, an automobile body is painted, a structure is known in which the front and rear ends of the body are fixed to a horizontal axis and rotatably held on a bogie (for example, JP-A-3-296471). This publication describes that the painted surface of the vehicle body is smoothed by drying the paint while rotating the vehicle on a bogie on which the paint is applied to a thickness not less than the sagging limit thickness.

[0003]

As described above, in the method in which the paint is sprayed on the object hung on the hanger, the efficiency with which the sprayed paint is applied to the object (the coating efficiency) ) Is about 12% at most, and there is a problem that a large amount of paint is wasted.

The present invention has been made in view of the above circumstances, and provides a coating apparatus and a coating method that improve the coating efficiency, effectively use the coating, and reduce the difference between the parts of the film thickness. It is.

[0005]

Means for Solving the Problems The present invention (claim 1) provides:
It comprises a rotating shaft installed in the horizontal direction, a mounting jig fixed to the rotating shaft and rotating on a predetermined circular orbit along with the rotation, and a plurality of small articles detachably mounted on the mounting jig. An object to be coated, a drive source for rotating and driving the rotating shaft, a paint spray nozzle for spraying a paint on the object to be coated, and a nozzle moving driver for reciprocating the nozzle in the rotation axis direction, A rotating shaft is driven to rotate, and a paint is sprayed from the nozzle while moving the nozzle in the direction of the rotating shaft to coat the object to be coated. In this configuration, the paint is attached to the front and back surfaces of the object to be coated when the paint is sprayed. Further, since the rotation is performed in the horizontal direction, the coating is performed evenly in the left and right direction of the object to be coated.

According to the present invention (claim 2), a rotating shaft installed in a horizontal direction, a mounting jig fixed to the rotating shaft and rotating on a predetermined circular orbit with the rotation, and the mounting jig An object to be coated composed of a plurality of small articles detachably attached to a jig, a conveyor for intermittently conveying the plurality of rotating shafts in a horizontally supported state, and a paint spray nozzle for spraying a paint on the object to be coated A nozzle moving driver that reciprocates the nozzle in the direction of the rotation axis, a drive that rotates only the rotation shaft that is positioned below the nozzle, and a plurality of predetermined rotation shafts that are positioned before and after the rotation axis. And a source for rotating the predetermined rotating shaft, and spraying paint from the nozzle while moving the nozzle in the direction of the rotating shaft to apply the paint to the object to be coated. In such a configuration, the rotation shaft located behind the nozzle located below the nozzle (position before the coating) causes the spray paint scattered from the nozzle to adhere to the surface of the workpiece in a dot-like manner by the rotation. It works to spread thinly in a plane. On the other hand, the rotation shaft located in front of the rotation shaft located below the nozzle (position after painting) prevents dripping of the paint applied to the object to be coated by the rotation thereof, and the coating of the surface of the object to be coated is prevented. It acts to make the thickness uniform.

According to the present invention (claim 3), the portion of the mounting jig to which the object to be coated is rotatable, and the angle of the object to be coated with respect to the nozzle can be changed. is there. In such a configuration, the object to be coated is rotated with respect to the mounting jig and set at an angle at which the paint sprayed from the nozzle is efficiently applied to the object to be coated.

In the present invention (claim 4), the reciprocating movement of the nozzle reverses the rotation direction of the rotating shaft during forward movement and backward movement. In such a configuration, the object to be coated rotates in the opposite direction to the paint spraying direction during the normal rotation and the reverse rotation of the rotating shaft,
There is little change in the paint film thickness depending on the part.

In the present invention (claim 5), the upper coated object is an outer handle of an automobile door. In such a configuration, the weight of the outer handle is at most 70
g / piece and 8 on a single rotating shaft via a mounting jig.
Attach them individually, rotate the rotating shaft, and paint.

According to the present invention (claim 6), a plurality of objects to be coated made of small parts are mounted on a mounting jig that rotates about a rotating shaft installed in a horizontal direction, and the object to be coated is simultaneously rotated. A paint is sprayed on the object to be coated from the paint spray nozzle which moves in the direction of the rotation axis, and the surface and the back of the object are coated. In such a configuration, the paint is attached to the front and back surfaces of the object to be coated when the paint is sprayed. In addition, since the rotation is performed in the horizontal direction, the coating can be performed without unevenness in the left-right direction of the object to be coated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 3, reference numeral 1 denotes a coating apparatus, 2 denotes a conveyor, and an intermittent drive motor 3 and a roller 4 acting as a drive source are provided in the leftward direction in FIGS. It is intermittently driven to a). A pair of metal or resin supports 5 are fixed on the conveyor 2 at predetermined intervals, for example, about 20 cm apart, and are horizontally provided one by one on the left and right sides, and a concave portion 6 is formed on the upper side thereof. Reference numeral 7 denotes a rotating shaft that is horizontally and detachably mounted on the concave portion 6 of the support tool 5,
The rotating shaft 7 that has undergone the preceding step is placed on the support 5 located at the right end of the conveyor 2 in FIG. 1 by an operator or a work robot. Reference numeral 8 denotes a mounting jig fixed to the rotating shaft 7, and reference numeral 9 denotes an object to be coated formed of a plurality of small parts, for example, eight, mounted on the mounting jig 8, for example, an outer handle of an automobile. The object to be coated 9 rotates on a circular orbit around the rotation shaft 7 by the rotation of the rotation shaft 7. The object to be coated 9 is formed by injection molding a material mainly composed of a polycarbonate resin.

Reference numeral 10 denotes a static elimination chamber through which the conveyor 2 on which the rotating shaft 7 is mounted first passes, and a static eliminator 11 is disposed therein. The static eliminator 11 generates ionized air, which is sprayed on the object 9 to remove static electricity from the object 9 to be removed, and removes dust adsorbed on the object 9 by the static electricity. is there. The static elimination chamber 10 is set to a size where the four rotating shafts 7 are located. Reference numeral 12 denotes a motor acting as a driving source. A belt 14 is wound around a roller 13, and the belt 13 is in contact with the lower portions of the three rotating shafts 7. Reference numeral 15 denotes a roller, and reference numeral 16 denotes a pressing belt, which functions to press the three rotating shafts 7 from above.
That is, the three rotating shafts 7 at this position are sandwiched between the two types of belts 14 and 16 and rotated by the drive thereof to promote the dust removing action. Here, the upper belt 16 rotates in conjunction with the lower belt 14, and the rotation of the rotary shaft 7 is ensured by sandwiching the rotary shaft 7 between the two types of belts 14, 16. Works, but the upper belt 1
6 can be separately structured to be rotatable by a motor.

Reference numeral 17 denotes a first coating chamber provided following the static elimination chamber 10, into which the object 9 from which dust has been removed in the static elimination chamber 10 is carried in. The first coating chamber 17 is large enough to accommodate seven rotating shafts 7, a coating robot 18 is installed at substantially the center thereof, and a spray nozzle 20 of a spray gun 19 attached to the tip thereof has front and rear nozzles. It is located on the fourth rotating shaft 7 from the rear and is reciprocated in the same direction as the direction in which the rotating shaft 7 is arranged, as shown by the arrow b in FIG. The painting robot 18 acts as a nozzle moving driver. When the nozzle 19 reciprocates, a paint of a predetermined color is ejected from the nozzle 19. The moving speed of the nozzle 19 reciprocates, for example, at intervals shown by an arrow b, and
Move over seconds. The reversal time from forward to return can be set to one second, so the reciprocating time of the nozzle 19 can be a total of 15 seconds.

Reference numeral 21 denotes a belt that rotationally drives the four rotating shafts 7 behind (before painting), and a motor 2 acting as a driving source.
2 and the roller 23. The rotating shaft 7 located at the front end of the four rotating shafts 7 is located below the nozzle 20. Other belts 24 are also arranged on these rotating shafts 7 so as to sandwich the rotating shaft 7 on the upper side similarly to the above.
The rotation of the rotating shaft 7 is ensured. These four rotating shafts 7 are driven by a motor 22 at a speed of, for example, 100 rpm.
Set to rotate, rotate forward for 7 seconds, reverse in the next 1 second,
Reverse rotation for another 7 seconds. Therefore, a forward / reverse rotation motor is used for this motor. The conveyor 2 is set so as to advance for 5 seconds and stop for 15 seconds. Therefore, the object to be coated 9 attached to one rotating shaft 7 is coated during the stop period of the conveyor 2 for 15 seconds. You.

The reason why the rotation of the rotating shaft 7 is reversed in the forward and reverse periods of the coating period is to prevent the coating thickness of the object 9 to be coated from being different depending on the part. The painting operation is interrupted for 5 seconds during which the conveyor 2 is driven. In addition to the rotating shaft 7 on which the front end is painted,
The three rear parts are formed by rotating these rotary shafts 7 before coating, so that during the coating of the workpiece 9 attached to the front end rotary shaft 7, these rotary shafts are scattered from the nozzle 20 at the subsequent stage. This is for uniformly spreading the paint adhered in a dot-like manner to the object 9 to be coated attached to the shaft 7 over the entire surface.

Reference numeral 25 denotes a belt that rotationally drives the three front shafts (before painting) 7 and a motor 1 acting as a drive source.
6 and the roller 27. Similar to the above, other belts 28 are arranged on the rotating shaft 7 so as to sandwich the rotating shaft 7 on the upper side, and the rotation of the rotating shaft 7 is ensured. The rotation speed of the rotating shaft 7 by the belt 25 is
The rotation speed is set lower than that before the painting, for example, about 50 rotations per minute, and the rotation is performed in only one direction. This rotation prevents the paint applied to the object 9 from flowing downward and dripping, and also suppresses the coating film thickness from being different depending on the part.

Reference numeral 29 denotes a preliminary drying chamber provided at the next stage of the first coating chamber 17, which contains about six rotating shafts 7, and the coated object 9 is naturally dried at room temperature.

Reference numeral 30 denotes a second coating room, on which the paint is applied so as to overlap the paint applied in the first coating room 17. This paint gives gloss to the painted surface (called a clear coat) and is transparent. The structure of the second coating room 30 is the first
It can be the same as that of the coating room 17. The rotating shaft 7 carried out of the second coating chamber 30 is removed from the support 5 by an operator or a work robot, and then the object 9 is removed from the mounting jig 8.

In FIG. 4, reference numeral 31 denotes an outer handle, which is the above-mentioned body 9 to be coated, and has a rectangular parallelepiped projection 32 formed at the front end thereof for coupling to the vehicle body. The outer handle 31 is attached to the attachment jig 8 using the projection 32. As shown in FIG. 5, the mounting jig 8 includes an arm 33 perpendicular to the rotating shaft 7 and a mounting portion 34 formed at the tip thereof.
The mounting portion 34 is attached to the arm portion 33 in a rotatable state (indicated by an arrow c). By rotating the coating portion 34, the angle of the outer handle 31 facing the nozzle 20 is changed and adjusted. For example, when it is desired to increase the thickness of the handle surface (outside the vehicle body), the surface is positioned outside, and when approaching the nozzle closest, the surface is perpendicular to the spraying direction. In this way, it is possible to apply the coating thicker on the front surface side (outside the vehicle body) than on the back surface side (inside the vehicle body). Painting part 34
Has a recess into which the projection 32 of the outer handle 31 is fitted. The mounting jig 8 having such a structure includes the rotating shaft 7.
Are formed. Here, the mounting jig 8 includes 4
Although the structure is such that the outer handles 31 are attached to each other, the structure may be different depending on the size, shape, etc. of the object 9 to be coated such as three.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0021]

FIG. 5 shows an example in which an outer handle 31 of an automobile door is used as a body 9 to be coated, and four of these are mounted on a mounting jig 8 of a rotating shaft 7 as shown in FIG. . For reference, data based on the conventional structure is shown. The conventional structure has a hanger suspended on a conveyor.
Each outer handle is suspended and painted by a worker or a work robot.

[0022]

[Table 1]

In this case, the moving speed of the nozzle 20 is 3 m / min.
m / min is the time required for the reciprocating movement of the rotating shaft 7, which is 12 seconds. To make the time for one round trip of the nozzle to be 15 seconds, the nozzle speed may be 3.5 m / min. The quality was judged from the viewpoint of the appearance quality, that is, whether the color of the resin ground was seen through, whether there was color unevenness, or the hue was uniform. As is clear from the table, it was confirmed that there was no problem with the quality, and on the other hand, the reduction of the paint was greatly improved to 46% and 35% as compared with the conventional example by improving the coating efficiency.

[0024]

According to the present invention (claim 1), coating is performed while rotating a plurality of objects in the horizontal axis direction, thereby improving the coating efficiency and reducing the amount of wastefully discharged paint. be able to. Further, the coating material is applied evenly to the surface of the object to be coated, and the difference in thickness depending on the portion is small.

According to the present invention (Claim 2), the rotation shaft located behind (before coating) the rotation shaft located below the nozzle is scattered from the nozzle before coating by the rotation. The paint adhered to the surface of the object is spread thinly over the entire surface of the object. Therefore, since the original coating is performed on the lightly painted surface, it can be finished to a smooth painted surface without unevenness. Further, after coating, the coating material still having fluidity is evenly spread on the surface of the object to be coated by rotation, so that the difference in the coating film thickness depending on the portion can be suppressed to a small value.

According to the present invention (claim 3), it is possible to adjust the coating film thickness on the front and back surfaces of the object to be coated to some extent by adjusting the angle of the object to be coated with respect to the spraying direction of the coating material. For example, when it is desired to apply the paint on the surface of the object to be coated thicker than the back surface, when the object to be coated arrives at a position closest to the nozzle by rotation, the surface is adjusted so as to be perpendicular to the paint spraying direction. Normally, the front side is thickly applied to the handle surface located outside the vehicle body such as the outer handle and the back surface inside the handle, so that the handle position is set as described above.

According to the present invention (claim 4), in the predetermined surface of the object to be coated, the amount of coating at the time of forward movement and at the time of backward movement are different, that is, the surface rotating in the spraying direction is opposite. Since the number of coatings is larger than the number of rotating surfaces, unevenness of the film thickness can be suppressed as a whole of the object to be coated.

According to the present invention (claim 5), a plurality of outer handles of an automobile door, which are small and lightweight small parts, are mounted on a mounting jig and rotated in a horizontal direction to improve coating efficiency. At the same time, the amount of paint used can be significantly reduced. In addition, the paint does not sag at the time of coating, and the difference in the film thickness between parts can be minimized.

According to the present invention (claim 6), the color of the ground is transparent by rotating the object to be coated about a horizontal rotation axis and spraying the coating material from a coating material spray nozzle which moves in the direction of the rotation axis. It is possible to obtain a coating which is not visible, has a small unevenness in film thickness, and has a stable hue. Further, the coating efficiency can be improved, and the amount of paint used can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a coating apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing a main part of FIG. 1; Note that, in the same figure, the support is indicated by a broken line.

FIG. 3 is a side view showing a main part of FIG. 1;

FIG. 4 is a perspective view showing an outer handle.

FIG. 5 is a perspective view showing a rotating shaft and a mounting jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Conveyor 3,12,22,26 Motor 4,13,15,23,27 Roller 5 Support 7 Rotating shaft 8 Mounting jig 9 Coating object 10 Static elimination chamber 14,16,21,24,25, 28 Belt 17 First Painting Room 18 Painting Robot 19 Spray Gun 20 Nozzle 29 Predrying Room 30 Second Painting Room 31 Outer Handle 32 Projection 33 Arm 34 Mounting Unit

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[Procedure amendment]

[Submission date] November 4, 1999 (1999.11.
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small object such as an outer handle of an automobile, which requires painting on the entire front and rear surfaces.
Object product coating device and a coating method of the.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

Conventionally, in a paint small product articles such as automotive outer handle, a small product parts are to be coated body, lowered plurality suspended in the suspended hanger conveyor, painting robot or It is often performed by a painter by spraying paint around with a spray gun. When a large body to be coated, for example, an automobile body is painted, a structure is known in which the front and rear ends of the body are fixed to a horizontal axis and rotatably held on a bogie (for example, JP-A-3-296471). This publication describes that the painted surface of the vehicle body is smoothed by drying the paint while rotating the vehicle on a bogie on which the paint is applied to a thickness not less than the sagging limit thickness.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010] The present invention (claim 6) has a plurality mounting an object to be coated body made of small product parts in the mounting fixture that rotates about a rotational axis disposed horizontally and rotate the object to be coated body at the same time A paint is sprayed on the object to be coated from a paint spray nozzle which moves in the direction of the rotation axis, and the front and back surfaces of the object are coated. In such a configuration, the paint is attached to the front and back surfaces of the object to be coated when the paint is sprayed. In addition, since the rotation is performed in the horizontal direction, the coating can be performed without unevenness in the left-right direction of the object to be coated.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 3, reference numeral 1 denotes a coating apparatus, 2 denotes a conveyor, and an intermittent drive motor 3 and a roller 4 acting as a drive source are provided in the leftward direction in FIGS. It is intermittently driven to a). A pair of metal or resin supports 5 are fixed on the conveyor 2 at predetermined intervals, for example, about 20 cm apart, and are horizontally provided one by one on the left and right sides, and a concave portion 6 is formed on the upper side thereof. Reference numeral 7 denotes a rotating shaft that is horizontally and detachably mounted on the concave portion 6 of the support tool 5,
The rotating shaft 7 that has undergone the preceding step is placed on the support 5 located at the right end of the conveyor 2 in FIG. 1 by an operator or a work robot. 8, fixed mounting fixture to the rotary shaft 7, 9, a plurality example 8 mounted small product parts in the mounting jig 8, as an object to be coated article, for example made of an automobile outer handle. The object to be coated 9 rotates on a circular orbit around the rotation shaft 7 by the rotation of the rotation shaft 7. The object to be coated 9 is formed by injection molding a material mainly composed of a polycarbonate resin.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

According to the present invention (Claim 5), the outer handle of the car door is small product parts small and light, is attached plurality the mounting jig, by rotating in the horizontal direction, the coating efficiency And at the same time greatly reduce the amount of paint used. In addition, the paint does not sag at the time of coating, and the difference in the film thickness between parts can be minimized.

Claims (6)

[Claims] 1. A rotating shaft installed in a horizontal direction, a mounting jig fixed to the rotating shaft and rotating on a predetermined circular orbit with the rotation, and a plurality of removably mounted on the mounting jig. An object to be coated made of a small article, a drive source for rotating and driving the rotating shaft, a paint spray nozzle for spraying a paint on the object to be coated, and a nozzle moving driver for reciprocating the nozzle in the direction of the rotating axis. A coating device for a small article, wherein the coating is performed on the object by spraying paint from the nozzle while rotating the rotary shaft and moving the nozzle in the direction of the rotary shaft. 2. A rotating shaft installed in a horizontal direction, a mounting jig fixed to the rotating shaft and rotating on a predetermined circular orbit with the rotation, and a plurality of detachably mounted on the mounting jig. An object to be coated composed of small articles, a conveyor for intermittently transporting the plurality of rotating shafts in a horizontally supported state, a paint spraying nozzle for spraying a paint on the to-be-coated object, and reciprocating the nozzle in the direction of the rotating shaft. A nozzle moving driving body to be moved, the rotary shaft positioned below the nozzle, and a drive source for rotating only a plurality of the predetermined rotary shafts positioned before and after the rotary shaft; A coating device for spraying a paint from the nozzle to apply the paint to the object to be coated while rotating the nozzle and moving the nozzle in the rotation axis direction. 3. The apparatus according to claim 1, wherein the part to be coated of the object to be coated of the mounting jig is rotatable, and an angle of the object to be coated with respect to the nozzle is changeable. Painting equipment for small parts. 4. The small component according to claim 1, wherein the direction of rotation of the rotating shaft is reversed during forward and backward movements of the nozzle when reciprocating the nozzle. Painting equipment. 5. The apparatus for coating small parts according to claim 1, wherein the upper body to be coated is an outer handle of an automobile door. 6. A plurality of objects to be coated made of small parts are attached to a mounting jig that rotates about a rotation axis installed in a horizontal direction, and the object to be coated is rotated and simultaneously moved in the direction of the rotation axis. A method for coating small parts, comprising spraying a paint on the object to be coated from a paint spray nozzle to coat the object.