JP5553261B2 - COATING GUN AND COATING METHOD USING THE COATING GUN - Google Patents

Description

  The present invention relates to a coating gun used when, for example, a lower part of an automobile body is coated with a high-viscosity paint, and a coating method using the coating gun.

  Conventionally, when an object such as an automobile body is painted using a paint gun, for example, when the upright bolt X as shown in FIG. In order to prevent this from occurring, the upright bolt X and the surrounding portion X ′ (that is, the seat surface portion for the bolt connection) are set as the coating prohibited portion K, and the coating prohibited portion K is masked. In this state, the workpiece W was painted.

  Patent Document 1 discloses a coating gun for electrostatic coating.

JP 58-153559 A

  However, it takes time and effort to perform the masking process, and it also takes time and time to remove the masking material after painting. For this reason, the object to be coated has a coating prohibition part as described above. In this case, there is a problem that the efficiency of the painting work is greatly reduced and the work cost is increased.

  In view of this situation, a main problem of the present invention is to provide a coating gun and a coating method that can effectively solve the above-described problems.

The first characteristic configuration of the present invention relates to a paint gun,
Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A paint nozzle that ejects paint toward an object to be coated is attached to the tip of the gun at a position eccentric from the rotation axis ,
A plurality of the paint nozzles are arranged around the rotation axis in a state where the inclined posture with respect to the rotation axis or the amount of eccentricity from the rotation axis is different from each other, and attached to the tip of the gun.
Among these paint nozzles, there is provided a nozzle switching means for changing a pattern diameter for selectively switching paint nozzles for spraying paint .

That is, according to the coating gun of this configuration, the coating nozzle is rotated and moved in an arc around the rotation axis (that is, the rotation axis) by rotating the tip of the gun around the rotation axis with respect to the gun base. If the paint nozzle is ejected from the paint nozzle in this arc-shaped rotational movement, a donut-like paint pattern is drawn on the object to be coated. Can do.

  Therefore, if the object to be coated such as the projecting object such as a standing bolt and its surrounding part, or the hole part such as a bolt hole and its surrounding part exists in the object to be coated, the rotating shaft core is the coating prohibited part. With the gun tip positioned at a position perpendicular to the center of the gun, the gun tip is driven and rotated around the axis of rotation as described above to rotate the paint nozzle in an arc shape. It is possible to paint only the area around the prohibited portion of the object to be coated without painting the prohibited portion.

  That is, this eliminates the need for a masking process for the paint-prohibited portion, can greatly increase the painting work efficiency, and can greatly reduce the work cost.

  By the way, to draw a donut-shaped coating pattern, the entire coating gun is rotated and moved in an arc shape, or the paint nozzle is placed on the rotation axis and tilted with respect to the rotation axis. It is possible to attach and rotate the tip of the gun around the axis of rotation with respect to the gun base. However, in the former case, the operation of moving the painting gun becomes complicated, and painting with a painting gun is also required. There arises a problem that the operation control of the robot becomes complicated and difficult.

  In the latter case, the inclination angle of the coating nozzle with respect to the rotational axis must be increased in order to secure a sufficient diameter of the doughnut-shaped coating pattern under the condition that the distance between the object to be coated and the coating nozzle is specified. Therefore, there is a problem that coating unevenness is likely to occur between the inner diameter side portion and the outer diameter side portion of the doughnut-shaped coating pattern because the paint is sprayed from the oblique direction to the surface of the object to be coated. .

  On the other hand, according to the coating gun having the above configuration, a donut-shaped coating pattern can be drawn only by an arc-shaped drive rotation at the tip of the gun without moving the painting gun. In addition, since the donut-like paint pattern is basically drawn with the eccentric arrangement of the paint nozzle with respect to the rotation axis, it is also possible to avoid spraying paint from a tight oblique direction on the surface of the object to be coated. It is possible to draw a good donut-shaped coating pattern without coating unevenness.

  On the other hand, as shown in Patent Document 1 described above, it is known that a coating gun for electrostatic coating draws a donut-shaped coating pattern (in many cases as a defect). The donut-shaped coating pattern obtained with the coating gun is drawn as a dispersion pattern of paint particles sprayed at the same time, so the outline is unclear on both the inside and outside as shown in FIG. Not a few paint particles are dispersed in the center of the pattern TP ′.

  Therefore, if the surrounding area of the paint prohibition part is painted without the masking treatment for the paint prohibition part with such a donut-like paint pattern drawn by such a paint gun for electrostatic paint, the paint particles are also applied to the paint prohibition part. If the diameter of the donut-shaped coating pattern is increased in order to prevent this overspray, there will be unpainted or insufficient coating in the coating of the surrounding area of the coating prohibited portion.

  On the other hand, in the case of the coating gun having the above configuration, the paint nozzle itself is rotated and moved in an arc shape so that a donut-like paint pattern is drawn like a one-stroke drawing. Therefore, a donut-like paint having a clear outline as shown in FIG. The pattern TP can be drawn, and it is possible to reliably avoid overspraying on the central portion (that is, the paint prohibition portion) of the donut-like paint pattern TP, and also cause unpainted or insufficient paint in the coating around the paint prohibition portion. This can be avoided reliably.

In the implementation of the first characteristic configuration and the second and third characteristic configurations described later , the paint nozzle is preferably an airless type that ejects the paint without using compressed air, but is not necessarily limited to the airless type. Various types of spray nozzles can be used.

  As the structure of the paint nozzle part in the paint nozzle, a slit structure in which the cross-sectional shape of the spray pattern is a flat shape is suitable, and in this case, the long axis direction of the flat shape is the radial direction from the rotation axis. Although it is preferable to attach the paint nozzle to the gun tip in the mounting posture, the structure of the paint jet outlet is not necessarily limited to the slit structure, and the spray pattern has a cross-sectional shape that is full, elliptical, or full. It may be a rectangular shape.

  Moreover, although the high-viscosity thing is suitable for the coating material ejected from a coating-material nozzle, it is not necessarily restricted to a high-viscosity coating material.

In the implementation of the first characteristic configuration and the second and third characteristic configurations to be described later, it is desirable to provide a paint switching means for selectively switching the paint to be ejected from the paint nozzle from among a plurality of types of paint. In this case, the paint switching means may adopt either a form equipped on the main part of the paint gun or a form equipped on a painting robot equipped with the paint gun.

Furthermore, in the first feature configuration, the plurality of paint nozzles are attached to the gun tip portion side by side around the rotation axis in a state where the inclined posture with respect to the rotation axis or the amount of eccentricity from the rotation axis is different from each other.
Since the coating material nozzle to the coating material ejection of these coating nozzles is provided with a nozzle switching means for selectively switching pattern diameter changes, then also Kanade operational effects.

In other words, the nozzle switching means for the coating material nozzle pattern diameter changes to paint ejection among the plurality of coating nozzles eccentricity attached to the gun tip at different state from the inclined posture or rotational axis for rotating axis Only by selectively switching, the diameter of the donut-shaped coating pattern drawn by the arc-shaped rotational movement of the coating nozzle as described above can be changed to a diameter corresponding to the coating prohibited portion at that time.

  In other words, this makes it possible to provide a coating gun with high compatibility with various coating prohibited portions, and it is possible to more reliably and effectively achieve an improvement in painting work efficiency and a reduction in work costs.

  A plurality of paint nozzles that are arranged around the rotation axis and attached to the tip of the gun in a state in which the tilting posture with respect to the rotation axis or the amount of eccentricity from the rotation axis are different from each other are the same type of paint nozzles or different types of paint nozzles. Any of these may be used.

  Further, when the tilt postures with respect to the rotation axis are different from each other, one of the options of the tilt posture may be a posture parallel to the rotation axis.

  The nozzle switching means for changing the pattern diameter may employ either a form equipped on the main body of the paint gun or a form equipped on a painting robot equipped with a paint gun.

The second characteristic configuration of the present invention relates to a paint gun,
Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A paint nozzle that ejects paint toward an object to be coated is attached to the tip of the gun at a position eccentric from the rotation axis,
Different paint nozzles having different paint jet nozzle structures as the paint nozzle are arranged around the rotation axis and attached to the tip of the gun.
Among these different kinds of paint nozzles, there is provided a nozzle switching means for selecting different kinds of nozzles for selectively changing paint nozzles to which the paint is ejected.

That is, according to the coating gun of this configuration, the coating nozzle is rotated and moved in an arc around the rotation axis (that is, the rotation axis) by rotating the tip of the gun around the rotation axis with respect to the gun base. If the paint nozzle is ejected from the paint nozzle in this arc-shaped rotational movement, a donut-like paint pattern is drawn on the object to be coated. Can do.
Therefore, if the object to be coated such as the projecting object such as a standing bolt and its surrounding part, or the hole part such as a bolt hole and its surrounding part exists in the object to be coated, the rotating shaft core is the coating prohibited part. With the gun tip positioned at a position perpendicular to the center of the gun, the gun tip is driven and rotated around the axis of rotation as described above to rotate the paint nozzle in an arc shape. It is possible to paint only the area around the prohibited portion of the object to be coated without painting the prohibited portion.
That is, this eliminates the need for a masking process for the paint-prohibited portion, can greatly increase the painting work efficiency, and can greatly reduce the work cost.
Furthermore, according to the above-described configuration, the paint condition at that time can be simply changed by selectively switching the paint nozzle for spraying the paint among the plurality of different paint nozzles attached to the tip of the gun by the nozzle switching means for selecting the different kind of nozzle. The paint can be applied in the form of a paint jet according to the above, and in this respect, the paint gun can be made more convenient and versatile.

In the implementation of the second characteristic configuration, the nozzle switching means for selecting different types of nozzles may adopt either a form equipped on the main body of the paint gun or a form equipped on a painting robot equipped with the paint gun.

The third characteristic configuration of the present invention relates to a paint gun,
Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A paint nozzle that ejects paint toward an object to be coated is attached to the tip of the gun at a position eccentric from the rotation axis,
The paint nozzle is attached to the tip of the gun in a state in which the rotation posture can be changed around the center axis of the paint nozzle .

That is, according to the coating gun of this configuration, the coating nozzle is rotated and moved in an arc around the rotation axis (that is, the rotation axis) by rotating the tip of the gun around the rotation axis with respect to the gun base. If the paint nozzle is ejected from the paint nozzle in this arc-shaped rotational movement, a donut-like paint pattern is drawn on the object to be coated. Can do.
Therefore, if the object to be coated such as the projecting object such as a standing bolt and its surrounding part, or the hole part such as a bolt hole and its surrounding part exists in the object to be coated, the rotating shaft core is the coating prohibited part. With the gun tip positioned at a position perpendicular to the center of the gun, the gun tip is driven and rotated around the axis of rotation as described above to rotate the paint nozzle in an arc shape. It is possible to paint only the area around the prohibited portion of the object to be coated without painting the prohibited portion.
That is, this eliminates the need for a masking process for the paint-prohibited portion, can greatly increase the painting work efficiency, and can greatly reduce the work cost.
Furthermore, according to the above configuration, in the case of a paint nozzle in which the cross-sectional shape of the spray pattern also changes the rotational posture when the paint nozzle is rotated around the center axis, the paint nozzle is arranged around the center axis as described above. By changing the rotation posture, the width (inside / outside diameter difference) of the doughnut-shaped paint pattern drawn by the arc-shaped rotational movement of the paint nozzle as described above can be adjusted as appropriate. In addition, the paint gun can be made more convenient.

In the implementation of the third feature configuration, an actuator for rotating the paint nozzle around its central axis is provided in the body portion of the paint gun so that the rotation posture of the paint nozzle can be changed remotely. However, in some cases, the rotation posture may be changed manually by default.

The fourth characteristic configuration of the present invention specifies an embodiment suitable for the implementation of any of the first to third characteristic configurations,
The paint nozzle is attached to the tip of the gun in a state where the inclination posture with respect to the rotating shaft core can be changed or the amount of eccentricity from the rotating shaft core can be changed.

In other words, according to this configuration, the diameter of the donut-shaped paint pattern drawn by the arcuate rotational movement of the paint nozzle as described above is changed according to the paint prohibition portion at that time by the change operation of the inclined posture or the change operation of the eccentric amount. The diameter can be changed to a different diameter, thereby improving the compatibility with various paint-prohibited portions.

In the implementation of the fourth feature configuration, an actuator for changing the inclination posture or the eccentric amount of the paint nozzle is provided in the main body of the paint gun, and the changing operation of the inclined posture and the changing operation of the eccentric amount are performed in a remote control manner. However, in some cases, the tilt posture changing operation and the eccentricity changing operation may be manually performed as an initial setting.

A fifth characteristic configuration of the present invention relates to a coating method using a coating gun according to any of the first to fourth characteristic configurations,
When coating a normal coating site on the article to be coated, the paint nozzle in the paint jetting state is placed on the surface of the article to be coated with the drive rotation of the gun tip around the rotational axis being stopped. Along a straight line,
When coating the surrounding area of the coating prohibited portion in the object to be coated, the gun tip is positioned at a position where the rotation axis is perpendicular to the center of the coating prohibited portion, and the gun tip is positioned at that position. This is in that the paint nozzle in a paint spraying state is rotationally moved around the rotational axis in an arc shape by driving and rotating the part around the rotational axis with respect to the gun base part.

That is, in this coating method, For a normal painting site in the article to be coated, in a state where the driving rotation is stopped at the rotational axis around the gun tip as described above, coating objects with coating material nozzle in the paint ejection state By moving the coating gun so that it is linearly translated along the surface of the surface, the normal coating portion of the object to be coated is painted in a form in which a belt-like coating pattern is continuously drawn.

  In addition, the linear parallel movement said here includes the linear movement of each halfway point in meandering movement, for example.

  On the other hand, with respect to the portion around the coating prohibited portion in the object to be coated, the gun tip is positioned at a position where the rotation axis is perpendicular to the center of the coating prohibited portion as described above, and the gun tip is positioned at that position. By operating the paint gun so that the paint nozzle that is in the paint spraying state is rotated around the rotation axis in a circular arc around the rotation axis, the paint gun is operated as described above. A donut-like paint pattern is drawn like a single stroke, and only the portion around the paint-prohibited portion of the object to be coated is painted in a donut shape.

  That is, according to this coating method, it is possible to paint both the normal painting portion of the article to be coated and the surrounding portion of the painting-prohibited portion with a single painting gun. The painting work can be made easier and the painting work efficiency can be further improved.

  In carrying out this coating method, a portion of the coating prohibited portion is painted by drawing a donut-shaped coating pattern every time the coating prohibited portion is reached while the normal coating portion is being painted. However, depending on the situation, it may be necessary to paint the area around the prohibited area in a donut shape before painting the normal area, or conversely, to paint the area around the prohibited area in a donut shape. You may employ | adopt the operation | work form etc. which paint the normal painting site | part beforehand.

This painting method is suitable for automatic painting by a painting robot that holds a painting gun, but in some cases, it is adopted by hand-blown painting in which the worker holds the painting gun and paints. May be.
The sixth feature configuration of the present invention is similar to the coating method of the fifth feature configuration described above, in which the gun tip is connected to the gun base so that it can be driven and rotated around the rotation axis, The present invention relates to a coating method using a coating gun that is attached to the tip of the gun at a position that is eccentric from the rotational axis of the coating nozzle that ejects the coating toward an object.
When coating a normal coating site on the article to be coated, the paint nozzle in the paint jetting state is placed on the surface of the article to be coated with the drive rotation of the gun tip around the rotational axis being stopped. Along a straight line,
When coating the surrounding area of the coating prohibited portion in the object to be coated, the gun tip is positioned at a position where the rotation axis is perpendicular to the center of the coating prohibited portion, and the gun tip is positioned at that position. This is in that the paint nozzle in a paint spraying state is rotationally moved around the rotational axis in an arc shape by driving and rotating the part around the rotational axis with respect to the gun base part.
In other words, in this coating method, the coating nozzles in the paint jetting state are stopped on the coating object in a state where the drive rotation around the rotation axis of the tip of the gun is stopped as described above for the normal coating part of the coating object. By moving the coating gun so as to translate it linearly along the surface, the normal coating portion of the object to be coated is painted in a form in which a strip-shaped coating pattern is continuously drawn.
In addition, the linear parallel movement said here includes the linear movement of each halfway point in meandering movement, for example.
On the other hand, with respect to the portion around the coating prohibited portion in the object to be coated, the gun tip is positioned at a position where the rotation axis is perpendicular to the center of the coating prohibited portion as described above, and the gun tip is positioned at that position. By operating the paint gun so that the paint nozzle that is in the paint spraying state is rotated around the rotation axis in a circular arc around the rotation axis, the paint gun is operated as described above. A donut-like paint pattern is drawn like a single stroke, and only the portion around the paint-prohibited portion of the object to be coated is painted in a donut shape.
That is, according to this coating method, it is possible to paint both the normal painting portion of the article to be coated and the surrounding portion of the painting-prohibited portion with a single painting gun. The painting work can be made easier and the painting work efficiency can be further improved.
In carrying out this coating method, a portion of the coating prohibited portion is painted by drawing a donut-shaped coating pattern every time the coating prohibited portion is reached while the normal coating portion is being painted. However, depending on the situation, it may be necessary to paint the area around the prohibited area in a donut shape prior to painting the normal area. You may employ | adopt the operation | work form etc. which paint the normal painting site | part beforehand.
This painting method is suitable for automatic painting by a painting robot that holds a painting gun, but in some cases, it is adopted by hand-blown painting in which the worker holds the painting gun and paints. May be.

Paint gun side view Front of paint gun Side view of a painting robot equipped with a painting gun Illustration of painting work mode Illustration showing a donut-shaped paint pattern Front view showing another embodiment The perspective view which shows another embodiment Diagram showing paint pattern drawn by paint gun for electrostatic painting

  1 and 2 show a paint gun 1, which is formed by connecting a gun tip 1a having paint nozzles 2a to 2d attached to the tip thereof to one end of a gun base 1b. The distal end portion 1a is connected to the gun base portion 1b with the gun center axis Q serving as a rotation axis and being capable of driving and rotating around the rotation axis Q.

  Further, a flange-like connector 1c for connecting the coating gun 1 to the working arm of the painting robot is attached to the other end side of the gun base 1b.

The tip of the gun tip 1a (the end opposite to the gun base 1b) is arranged on the same circumference around the rotation axis Q at regular intervals around the rotation axis Q. Four paint nozzles 2a to 2d are attached, and the first and fourth paint nozzles 2a, 2d are arranged in a posture parallel to the rotation axis Q (that is, in a direction parallel to the rotation axis Q). The gun is attached to the gun tip 1a in a spraying posture with an inclination angle θ = 0).

  The second and third paint nozzles 2b and 2c are inclined with respect to the rotational axis Q with the same inclination angle θ inclined outward (that is, obliquely widening with respect to the rotational axis Q). It is attached to the gun tip 1a in such a posture that the paint T is ejected in the direction).

  As the type of paint nozzle 2, two types of paint nozzles of type A and type B, which are different from each other in the structure of the paint spout part p, are employed. The first and second paint nozzles 2a and 2b are of type A. The paint nozzles are used, and the third and fourth paint nozzles 2c and 2d are B-type paint nozzles.

  Inside the coating gun 1, an internal paint path 4 for sending the paint T supplied from the paint hose 3 to the paint nozzles 2a to 2d is formed so as to extend from the gun base 1b to the gun tip 1a. The part 1a is provided with a nozzle switching valve device 5 for selectively switching which paint nozzle 2a to 2d the paint T supplied through the internal paint path 4 is sent to.

  In other words, the nozzle switching valve device 5 selectively switches among the first to fourth paint nozzles 2a to 2d, and the first to fourth paint nozzles 2a to 2d. The nozzle switching valve device 5 also performs a paint temporary stop operation for bringing all of the above into a state where paint spraying is stopped.

  The gun base 1b is internally provided with a rotation driving device 6 such as an air motor for driving and rotating the gun tip 1a around the rotation axis Q. By this rotation driving device 6, the gun tip 1a is moved to the gun base. The paint nozzles 2a to 2d that are in the paint jetting state are rotationally moved in an arc around the rotation axis Q (that is, the amount of eccentricity e from the rotation axis Q is driven by rotating around the rotation axis Q with respect to 1b. Can be moved in a circular motion state with a radius of.

  FIG. 3 shows a painting robot 7 in which the painting gun 1 is attached to the tip of the work arm 7a. While the painting gun 1 is moved along a predetermined movement path by the painting robot 7, any coating nozzle 2a is used. By performing the paint jetting operation of ˜2d, for example, undercoat coating for coating the lower part of the floor of the automobile body with the high-viscosity paint T is performed in an automated state.

  FIG. 4 shows an example of a coating work mode in the case where the coating W is provided with the coating prohibited portion K in the coating of the coating W using the coating gun 1 by the coating robot 7. In this example, the upright bolt X exists in the article W to be coated, and the upright bolt X and the surrounding portion X ′ (that is, the seat surface portion with respect to the bolt connected object) are the coating prohibited portion K.

  In contrast to the presence of such a paint-prohibited portion K, the paint-sprayed state of the normal paint portion away from the paint-prohibited portion K is stopped while the drive rotation of the gun tip 1a around the rotation axis Q is stopped. The coating gun 1 is moved so that the coating nozzles 2a to 2d are moved along the linear movement path indicated by the one-dot chain line (A) and the one-dot chain line (C) along the surface of the article W to be coated. Thus, coating is performed in a form in which a strip-shaped coating pattern is continuously drawn.

  On the other hand, with respect to the portion around the coating prohibited portion K in the article W, the gun tip 1a is positioned at a position where the rotation axis Q is orthogonal to the center of the coating prohibited portion K, and the gun tip 1a is located at that position. Is rotated around the rotation axis Q with respect to the gun base 1b, and the paint nozzles 2a to 2d in the paint jetting state are rotated so as to be rotated along an arcuate movement path indicated by a one-dot chain line in (B). By operating the gun 1, a donut-shaped coating pattern TP as shown in FIG. 5 is drawn around the paint-prohibited portion K as shown in a single stroke, and only the portion around the paint-prohibited portion K in the article W is donut-shaped. Paint on.

  That is, by adopting such a painting work mode, it is possible to eliminate the masking process for the coating prohibited portion K, and substantially both the normal coating portion of the article to be coated W and the surrounding portion of the coating prohibited portion K are substantially provided. Thus, it is possible to paint with one painting gun 1.

  Further, when the gun tip 1a is driven and rotated around the rotation axis Q to draw a donut-shaped coating pattern TP, the first or fourth of the four paint nozzles 2a to 2b is parallel to the rotation axis Q. The nozzle switching valve device 5 determines whether the paint is ejected from the paint nozzles 2a, 2d or the paint is ejected from the second or third paint nozzles 2b, 2c inclined with respect to the rotation axis Q. By selecting by nozzle switching, the diameter of the donut-shaped coating pattern TP drawn by the arcuate rotational movement of the coating nozzles 2a to 2d is changed according to the coating prohibition portion K at that time.

  Furthermore, in order to paint the normal paint part and the part around the paint prohibition part K, the paint is applied from the first or second paint nozzle 2a, 2b which is the A type paint nozzle among the four paint nozzles 2a-2b. The nozzle switching valve device 5 determines whether to eject the paint from the third or fourth paint nozzle 2c, 2d, which is a B-type paint nozzle, depending on the paint conditions of the paint site. An appropriate selection can be made by switching nozzles.

  That is, in this example, the nozzle switching valve device 5 selects which one of the pattern diameter changing nozzle switching means for changing the diameter of the donut-shaped coating pattern TP and the type A or type B paint nozzle is used. It also serves as nozzle switching means for selecting different types of nozzles.

  In addition, when painting the normal coating part of the to-be-coated object W and the surrounding part of the coating prohibition part K by the above-described painting work form, the paint is moved in the order of the alternate long and short dash lines (A), (B), (C). Although it is desirable to adopt an operation mode in which the paint nozzles 2a to 2d that are in the ejected state are moved, depending on the case, the movement path in the order of the alternate long and short dashed lines (B), (A), and (C) and the alternate long and short dashed lines (A), You may employ | adopt the operation | work form which moves the coating-material nozzles 2a-2d in a coating-jet state by the movement path | route of the order of (C) and (B).

[Another embodiment]
Next, another embodiment of the present invention will be listed.

  In the above-described embodiment, an example in which a plurality of paint nozzles 2a to 2d are attached to the gun tip 1a has been shown. However, in some cases, only one paint nozzle 2a is eccentric from the rotation axis Q. You may make it attach to 1a.

  In the above-described embodiment, the plurality of paint nozzles (first and fourth paint nozzles 2a and 2d and second and third paint nozzles 2b and 2c) are inclined with respect to the rotation axis Q (inclination angle). θ) are different from each other, and are arranged on the same circumference around the rotation axis Q and attached to the gun tip 1a, but instead of or in addition to this, a plurality of paint nozzles 2a to 2d Are arranged around the rotation axis Q in a state where the eccentric amounts e from the rotation axis Q are different from each other, and are attached to the gun tip 1a. In this configuration, the nozzle for switching the paint is selectively switched by the nozzle switching valve device 5. Thus, the diameter of the donut-shaped coating pattern TP may be changed as appropriate.

  As shown in FIG. 6, one or a plurality of paint nozzles 2a to 2d attached to the gun tip 1a at a position eccentric from the rotation axis Q are changed in the amount of eccentricity e from the rotation axis Q (or the rotation axis). It is possible to change the diameter of the doughnut-shaped coating pattern TP by changing the eccentric amount e (or the inclined posture θ). .

  Further, as shown in FIG. 7, the paint nozzle 2a attached to the gun tip 1a at a position eccentric from the rotation axis Q can be changed in a state where the rotation posture around the center axis q of the paint nozzle 2a can be changed. You may make it attach to the front-end | tip part 1a.

  The structure of the gun tip portion 1a to which the paint nozzles 2a to 2d are attached and the structure of the gun base portion 1b for connecting the gun tip portion 1a so as to be able to drive and rotate are not limited to the structure shown in the above-described embodiment, and various changes can be made. In addition, various structures can be adopted as a specific connection structure for connecting the gun tip 1a to the gun base 1b in a state in which a drive rotation operation around the rotation axis Q is possible. .

  The coating prohibition part that makes the masking process unnecessary by painting using the painting gun according to the present invention is not limited to the protruding part such as a standing bolt and its surrounding part, or the hole part such as a bolt hole and its surrounding part. It may be a flat circular portion or the like, and the painting gun according to the present invention can be used to paint the surrounding area of various painting prohibited portions.

  In addition, the painting gun according to the present invention is not limited to the use form for both the painting for the normal painting portion of the article to be coated and the painting for the surrounding portion of the painting prohibited portion, and it is used only for painting the surrounding portion of the painting prohibited portion. May be.

  The painting gun and the painting method using the same according to the present invention are not limited to the painting of automobile bodies, but can be used for painting any article.

  It can be used for painting various articles in various fields.

DESCRIPTION OF SYMBOLS 1a Gun front-end | tip part 1b Gun base | substrate part Q Rotating shaft core W Article to be coated T Paint 2a-2d Paint nozzle θ Inclination posture (inclination angle)
e Eccentricity 5 Nozzle switching means (for changing pattern diameter, for selecting different nozzles)
p Paint outlet q Center axis of paint nozzle

Claims (6)

Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A paint nozzle that ejects paint toward an object to be coated is attached to the tip of the gun at a position eccentric from the rotation axis ,
A plurality of the paint nozzles are arranged around the rotation axis in a state where the inclined posture with respect to the rotation axis or the amount of eccentricity from the rotation axis is different from each other, and attached to the tip of the gun.
A paint gun provided with a nozzle switching means for changing a pattern diameter for selectively switching a paint nozzle for spraying paint among these paint nozzles . Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A paint nozzle that ejects paint toward an object to be coated is attached to the tip of the gun at a position eccentric from the rotation axis,
Different paint nozzles having different paint jet nozzle structures as the paint nozzle are arranged around the rotation axis and attached to the tip of the gun.
A coating gun provided with nozzle switching means for selecting different types of nozzles for selectively switching among the different types of coating nozzles . Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A paint nozzle that ejects paint toward an object to be coated is attached to the tip of the gun at a position eccentric from the rotation axis,
A paint gun in which the paint nozzle is attached to the tip of the gun in a state in which the rotation posture can be changed around the center axis of the paint nozzle .   The said coating material nozzle is attached to the said gun front-end | tip part in the state in which the change of the inclination attitude | position with respect to the said rotating shaft center or the change of the eccentric amount from the said rotating shaft core is possible. Painting gun. A coating method using the coating gun according to any one of claims 1 to 4,
When coating a normal coating site on the article to be coated, the paint nozzle in the paint jetting state is placed on the surface of the article to be coated with the drive rotation of the gun tip around the rotational axis being stopped. Along a straight line,
When coating the surrounding area of the coating prohibited portion in the object to be coated, the gun tip is positioned at a position where the rotation axis is perpendicular to the center of the coating prohibited portion, and the gun tip is positioned at that position. A coating method in which the coating nozzle is rotated around the rotation axis in a circular arc shape by driving and rotating a portion around the rotation axis with respect to the gun base. Connect the gun tip to the gun base so that it can be driven and rotated around the axis of rotation.
A coating method using a coating gun attached to the tip of the gun at a position eccentric to the coating nozzle for ejecting the coating toward the article to be coated ,
When coating a normal coating site on the article to be coated, the paint nozzle in the paint jetting state is placed on the surface of the article to be coated with the drive rotation of the gun tip around the rotational axis being stopped. Along a straight line,
When coating the surrounding area of the coating prohibited portion in the object to be coated, the gun tip is positioned at a position where the rotation axis is perpendicular to the center of the coating prohibited portion, and the gun tip is positioned at that position. A coating method in which the coating nozzle is rotated around the rotation axis in a circular arc shape by driving and rotating a portion around the rotation axis with respect to the gun base.

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