JPH07213960A - Spray gun for coating - Google Patents

Abstract

PURPOSE:To provide a spray gun for coating in which jetted air pressure from an orifice for spraying hardly changes even if a pattern-adjusting valve is opened or closed and sufficiently high jetted air pressure of the orifice for spraying can be maintained constantly. CONSTITUTION:Three bypass orifices 31 are formed in the circumferential face of a nozzle main body and communicated with air passing holes 29 respectively positioned corresponding to the bypass orifices 31. Orifices 45, 47 for spraying and orifices 51, 53 for adjusting patterns are communicated to each other through the bypass orifices 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray gun for paints, and more particularly to a spray gun for paints equipped with a pattern control valve for adjusting the pattern shape of sprayed paint.

[0002]

2. Description of the Related Art As a spray gun for this type of paint,
There is one disclosed in Japanese Patent Laid-Open No. 4-277050. In FIG. 8, reference numeral 100 indicates a paint spray gun, and the paint hose 103 is connected to the paint spray gun 100.
One end of is connected. The other end of the connection hose 103 is connected to a regulator 105 which is a pressure control valve capable of setting air pressure, and the regulator 105 is connected to one end of an air pipe 107. Air piping 10
The other end of 7 is connected to the air tank 109 connected to the compressor 111.

The connecting hose 103 has a length of 2 to 5 m and an inner diameter of 6 to 10 mm in consideration of workability. If the connection hose 103 is short, the range in which the paint spray gun 100 is routed is limited, and a hose having a large inner diameter is heavy and difficult to bend, which makes it difficult to perform the painting work. Therefore, the length and the inner diameter of the connection hose 103 are inevitably determined practically. Further, when the regulator 105 is attached to the paint spray gun 100, the weight of the paint spray gun 100 becomes large and the handling becomes difficult.

The air compressed by the compressor 111 is stored in the air tank 109, passes through the air pipe 107, is depressurized to a predetermined pressure by the regulator 103, and is then supplied to the paint spray gun 100 through the connection hose 103. It The paint spray gun 100 is of a type capable of adjusting the pattern shape of the paint being sprayed. An air chamber is formed in the gun body 102 of the paint spray gun 100, and air is introduced into the air chamber via a connection hose 103. Gun body 1
02 is provided with an air valve for adjusting the air introduced into the air chamber.

A spray orifice and a pattern adjusting orifice are in communication with the air chamber. Further, a pattern control valve for controlling the air discharged from the pattern control orifice is provided. The gun body 102 is provided with a paint chamber into which paint is introduced, and paint is introduced into the paint chamber from a paint cup 106. A paint discharge port 107 is formed in the paint chamber, and the paint discharge port 107 is opened and closed by a needle valve.

Trigger 10 of this paint spray gun 100
When 4 is pulled, the air valve is opened to introduce air into the air chamber, and the air introduced into the air chamber is ejected from the atomizing orifice. On the other hand, when the trigger 104 is pulled, the needle valve is opened, the paint is discharged from the paint discharge port 107, and this paint is atomized by the air jetted from the spray orifice and sprayed onto the coated surface.

Further, the degree of opening and closing of the pattern adjusting valve is adjusted, the air jetted from the pattern adjusting orifice is adjusted, and the pattern shape of the sprayed paint is adjusted. When the pattern control valve is completely closed, the pattern shape of the sprayed paint is substantially circular, and when the pattern control valve is opened, the pattern shape of the paint becomes elliptical or oval,
As the pattern control valve is opened, the flatness of the elliptical pattern shape increases.

When the ratio of the absolute pressures upstream and downstream of the atomizing orifice, that is, H (air pressure injected from the atomizing orifice) / L (atmospheric pressure) becomes 1.893 or more, which is the critical pressure ratio, the atomizing orifice is discharged. The jet speed of the jetted air becomes sonic, and the splash rate of the sprayed paint becomes close to the maximum. If this H / L is smaller than 1.893, the jet speed of the air jetted from the spray orifice becomes lower than the sonic velocity, and the scattering rate of the sprayed paint can be reduced. The pressure of the air sprayed from the spray orifice is one measure for setting the critical pressure ratio to a value smaller than 1.893. If the spray air pressure is 69 KPa or less, the spray rate of the sprayed paint Can be quite small.

Therefore, in the coating spray gun 100, the air pressure from the atomizing orifice is set to 69 KPa with the pattern control valve closed.
If the spray air pressure from the spray orifice is too low, the paint cannot be made finer and it will not be possible to achieve a clean coating. Therefore, even if the pattern control valve is open, the spray pressure will be 6
Ideally, the coating should be performed while maintaining a value closer to 9 KPa.

[0010]

However, in the paint spray gun 100, when the pattern control valve is closed, the injection air pressure from the spray orifice is 69 KPa.
If set so that there is a problem that when the pattern control valve is opened, the air pressure from the atomizing orifice drops extremely and the paint cannot be made finer, making it impossible to form a clean painted surface. .

That is, with the pattern control valve closed,
69PKa that can suppress the scattering of sprayed paint
The air pressure at the inlet of the air chamber is also determined by setting the injection air pressure to some extent, but at the above-mentioned length and inner diameter of the hose and the mounting position of the regulator, when the pattern control valve is opened, the flow rate of air increases, Connection hose 1
There is a problem that the pressure loss in 03 increases, the pressure at the air chamber inlet decreases correspondingly, and the injection air pressure at the atomizing orifice drops extremely, making it impossible to perform a clean coating.

The pressure loss of the connection hose 103 (inside the circular pipe) is generally expressed by the Darcy-Weissbach equation shown in Eq.

[Equation 1]

The present invention has been made by paying attention to the above-mentioned conventional problems. Even if the pattern control valve is opened / closed, the injection air pressure from the atomizing orifice hardly changes, and the atomizing orifice is always sufficient. It is an object of the present invention to provide a paint spray gun capable of maintaining the injection air pressure of the above.

[0014]

According to a first aspect of the present invention, there is provided a gun main body, a paint chamber formed in the gun main body to which a paint is supplied, and a paint discharge port for discharging the paint supplied to the paint chamber. An air chamber formed in the gun body and supplied with air through a hose; and a spray orifice for communicating with the air chamber and discharging air to atomize and spray the paint discharged from the paint discharge port. And a pattern adjusting orifice for discharging air for adjusting the pattern shape of the sprayed paint communicating with the air chamber, and a pattern adjusting valve for adjusting the air sent from the air chamber to the pattern adjusting orifice. A spray gun for a paint, comprising: a spray for paint, comprising a bypass orifice connecting the spray orifice and the pattern adjusting orifice. It is a cancer.

According to a second aspect of the present invention, in the first aspect, there is provided a depressurizing cylinder body which is arranged with an air passage gap between itself and the air chamber surface, and a sealing portion which seals the air passage gap. A decompression orifice formed so as to communicate with an inner peripheral surface and an outer peripheral surface of the decompression cylinder, wherein the decompression cylinder has a gap serving as the air passage communicated with a spray orifice, and the decompression cylinder The inside of the body is provided so as to communicate with the pattern adjusting orifice, and the pattern adjusting valve and a shaft supporting the pattern adjusting valve are provided inside the decompression cylinder, and the shaft and the inner peripheral surface of the decompression cylinder are provided. The spray gun for paints is characterized in that the gap between and is set to a size capable of reducing the pressure of the air supplied to the pattern adjusting orifice.

According to a third aspect of the present invention, in the first aspect, the depressurizing cylinder body is arranged with a gap serving as an air passage opened between the inner surface of the air chamber, and a sealing portion for sealing the gap serving as the air passage. A decompression orifice formed so as to communicate with an inner peripheral surface and an outer peripheral surface of the decompression cylinder, wherein the decompression cylinder has a gap serving as the air passage communicated with a spray orifice, and the decompression cylinder The inside of the body is provided so as to communicate with the pattern adjusting orifice, and a pattern adjusting valve and a shaft for supporting the pattern adjusting valve are provided inside the depressurizing cylinder to depressurize the air supplied to the pattern adjusting orifice. The spray gun for paint is characterized in that a decompression orifice for performing the above operation is provided on the shaft.

[0017]

Since the bypass orifice connecting the atomizing orifice and the pattern adjusting orifice is provided, the air in the air chamber is used for atomizing even when the pattern adjusting valve is closed. In addition to being ejected from the orifice, it is discharged from the pattern adjusting orifice through the bypass orifice.

Further, in the invention of claim 2, air is decompressed from the air chamber through the decompression orifice, and is supplied to the atomizing orifice through a gap serving as an air passage between the decompression cylinder and the air chamber inner surface. Further, air is depressurized from the air chamber through the inside of the depressurizing cylinder, through the gap between the shaft and the inner peripheral surface of the depressurizing cylinder, and is supplied to the pattern adjusting orifice.

According to the third aspect of the invention, the air is decompressed from the air chamber through the decompression orifice, and is supplied to the atomizing orifice through the gap serving as the air passage between the decompression cylinder and the inner surface of the air chamber. Also, air passes from the air chamber through the inside of the decompression cylinder,
The pressure is reduced through a pressure reducing orifice provided on the shaft and supplied to the pattern adjusting orifice.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a paint spray gun 1 according to a first embodiment of the present invention. This paint spray gun 1 is used in the same manner as the conventional paint spray gun 100 shown in FIG. Therefore, in the following description, the reference numerals used in FIG.

In the figure, reference numeral 3 indicates a gun body, and an air introduction path 5 is formed in the gun body 3. Further, a penetrating hole 7 and an air chamber 9 are formed in the gun body 3, and the air introduction path 5 communicates with the penetrating hole 7 and the air chamber 9. A paint chamber 11 is formed in the gun body 3, and a paint introducing passage 13 communicates with the paint chamber 11. An opening 15 is formed at the tip of the gun body 3 so as to communicate with the paint chamber 11. An air passage hole 17 is formed around the opening 15, and the air passage hole 17 communicates with the air chamber 9.
A male screw 19 is formed on the outer peripheral surface of the tip portion of the gun body 3.

Reference numeral 21 denotes a paint nozzle, and a projection 25 is formed on the front surface of the nozzle body 23 of the paint nozzle 21. A paint discharge hole 27 is formed at the tip of the protrusion 25, and the paint discharge hole 27 communicates with an opening 28 at the rear end. 12 around the protrusion 25 of the nozzle body 23
Individual air passage holes 29 are formed, and the air passage holes 29 communicate from the front surface to the back surface of the nozzle body 23. Further, the three bypass orifices 31 are provided on the peripheral surface of the nozzle body 23.
Are formed, and the bypass orifices 31 communicate with the air passage holes 29 at corresponding positions. A male screw 33 is formed at the rear end of the nozzle body 23. The nozzle main body 23 is inserted into the paint chamber 11 through the opening 15 of the gun main body 3, and the male screw 33 of the nozzle main body 23 is screwed into the female screw formed on the inner peripheral surface of the paint chamber 11.
1 is attached to the gun body 3.

Reference numeral 35 indicates a cap nut. A cap thrust washer 37 is fitted in the cap nut 35, and an air cap 39 is rotatably fitted therein. A cap retaining ring 41 is attached to the cap nut 35.
Is fitted to prevent the cap thrust washer 37 and the air cap 39 from coming off. Cap nut 35
A female screw 43 is formed on the inner peripheral surface of the.

A spray orifice 45 is formed at the center of the air cap 39, and a spray orifice 47 is formed on both sides of the spray orifice 45. The atomizing orifices 45 and 47 communicate with the atomizing air chamber 58. Further, on the front surface of the air cap 39, a pair of convex portions 49 are provided which face each other across the spraying orifice 45. The pattern adjusting orifice 5 is provided on the pair of convex portions 49.
1 and 53 are formed respectively. The pattern adjusting orifices 51 and 53 communicate with a pattern air chamber 55 formed in the air cap 39.

The cap nut 35 is attached to the cap thrust washer 37, the air cap 39 and the cap retaining ring 4.
After 1 is assembled, the female screw 43 of the cap nut 35 is screwed into the male screw 19 of the gun body 3, and the cap nut 35 is attached to the gun body 3. Paint outlet 2
7 is located at the center of the spray orifice 45, and there is a gap between the paint discharge port 27 and the outer periphery of the spray orifice 45.

Reference numeral 57 indicates an air valve pipe, which is inserted into the through hole 7 and is slidably supported by bearings 59 and 61. An air valve 60 is fixed in the middle of the air valve pipe 57. Reference numeral 63 indicates a pipe holder, and the pipe holder 63 is attached to the rear end portion of the through hole 7 with a screw. Pipe holder 6
A paint adjusting knob 67 fitted with a lock nut 65 is attached to the rear end portion of the screw 3 by means of screws. Bearing 5
A coil spring 69, which is passed through the air valve pipe 57, is interposed between the air valve 9 and the air valve 60. The air valve 60 is biased in the closing direction by the elastic force of the coil spring 69, and the bearing 59 is biased toward the pipe holder 63.

Reference numeral 71 indicates a needle valve, and a boss 73 is formed at the rear end portion of the needle valve 71. The needle valve 71 includes the pipe holder 63 and the air valve pipe 5.
Has been penetrated into 7. Further, the needle valve 71 is a trigger 75.
It is inserted into the paint chamber 11 through the pipe receiver 77 attached to the. The tip of the needle valve 71 is fitted so as to close the paint discharge port 27 of the paint nozzle 21 attached to the gun body 3. A coil spring 56 is fitted to the rear end portion of the needle valve 71. The coil spring 56 includes a boss 73 of the needle valve 71 and a paint adjusting knob 67.
Is intervened between.

Reference numeral 81 indicates a decompression cylinder, and this decompression cylinder 81 is a cylinder portion 82 and a sealing portion 8 formed integrally with the cylinder portion 82.
It is composed of three. A male screw is formed on the sealing portion 83. The decompression cylinder 81 is housed in the air chamber 9, and the male screw of the sealing portion 83 is attached and fixed to the female screw formed on the inner peripheral surface of the air chamber 9. In addition, the decompression cylinder 81
Two decompression orifices 85 are formed in the.

Reference numeral 87 indicates a pattern adjusting knob, and the pattern adjusting knob 87 is formed with a male screw. The male screw of this pattern adjustment knob 87 is the shaft holder 89.
Is attached to a female screw formed on the inner peripheral surface of the. A male screw is formed on the outer peripheral surface of the tip portion of the shaft holder 89, and this male screw is attached to a female screw formed on the peripheral surface of the opening of the air chamber 9.

The pattern adjusting knob 87 is provided with a shaft 91, and the shaft 91 is inserted into the pressure reducing cylinder 81. A pattern control valve 93 is provided at the tip of the shaft 91.
Are integrally formed. The pattern control valve 93 is formed in a shape in which the diameter gradually decreases toward the tip, and when fitted into the tip-side opening 95 of the pressure reducing cylinder 81, the pattern-controlling valve 93 closes the tip-side opening 95. Shaft 9
1, a large diameter portion 94 is formed, and the gap between the large diameter portion 94 and the inner peripheral surface of the pressure reducing cylinder 81 is set to a size capable of reducing the pressure of the air passing through this gap to a predetermined pressure. There is.

The pattern adjusting orifices 51, 53
Means that when the pattern control valve 93 is opened, the pressure in the pattern control orifices 51 and 53 becomes
It is set so as not to exceed the pressure in 5, 47.

In the paint spray gun 1, when the trigger 75 is pulled, the air valve pipe 57 is pressed by the pipe receiver 77 and slides in the direction A against the elastic force of the coil spring 69. When the air valve pipe 57 slides in the A direction, the air valve 60 opens and the air introduced into the air introduction path 5 is supplied to the air chamber 9. The air supplied to the air chamber 9 passes through the decompression orifice 85 of the decompression cylinder 81, is decompressed to a predetermined pressure, passes through the gap 97 between the decompression cylinder 81 and the cylinder portion 82, and further passes through the air of the paint nozzle 21. After passing through the hole 29, it is ejected from the atomizing orifices 45 and 47.

When the trigger 75 is pulled, the needle valve 71 moves to A
Driving in the direction, the needle valve 71 opens. Needle valve 71
When is opened, the paint supplied from the paint introducing passage 13 to the paint chamber 11 is discharged from the paint discharge port 27. Paint outlet 2
The coating material discharged from the nozzle 7 is sprayed with orifices 45, 47.
It is atomized by the air sprayed from and is sprayed on the painted surface.

Next, the operation of the paint spray gun 1 for adjusting the pattern shape of the sprayed paint and the operation of the paint spray gun 1 will be described. The pattern adjustment knob 87 is turned to drive the pattern adjustment valve 93 together with the shaft 91 in the direction A to open the pattern adjustment valve 93, and the inside of the pressure reducing cylinder 81 and the air cap 39 are opened through the opening 95 on the tip side of the pressure reducing cylinder 81. To communicate with the pattern air chamber 55. When the inside of the decompression cylinder 81 and the pattern air chamber 55 of the air cap 39 are communicated with each other, the air in the air chamber 9 passes through the gap between the large diameter portion 94 of the shaft 91 and the inner peripheral surface of the decompression cylinder 81. The pressure is reduced to a predetermined pressure, is further supplied to the pattern air chamber 55 from the tip end opening 95, and air is ejected from the pattern adjusting orifices 51 and 53. The shape of the paint pattern sprayed by this air is transformed into an elliptical shape or an oval shape.

As described above, when the pattern adjusting knob 87 is turned and the pattern adjusting valve 93 is closed and the trigger 75 is pulled to spray the paint, the air in the air chamber 9 is opened at the tip end opening. The air in the air chamber 9 is not supplied from 95 to the pattern air chamber 55, but is supplied only to the air passage hole 29. A part of the air supplied to the air passage hole 29 passes through the bypass orifice 31 to the pattern air chamber 55, and is discharged to the outside from the pattern adjusting orifices 51 and 53.

When the pattern control valve 93 is closed, the air pressure in the pattern air chamber 55 becomes lower than the air pressure in the spray air chamber 58, so that air flows from the spray air chamber 58 to the pattern air chamber 55. Since the air flows from the spray air chamber 58 to the pattern air chamber 55, the total air flow rate is reduced and the pressure in the air chamber 9 rises as compared with when the pattern control valve 93 is closed and the pattern control valve 93 is opened. However, the air pressure in the spray air chamber 58 does not rise.

When the pattern control valve 93 is opened, the air pressure in the air chamber 9 drops and the air pressure in the pattern air chamber 55 rises. Therefore, the bypass orifice 3
The air flowing from No. 1 to the pattern air chamber 55 from the air passage 29 communicating with the spray orifices 45 and 47 is reduced or stopped. Therefore, even if the pattern control valve 93 is opened / closed, it is possible to prevent the jet air pressure of the spray orifices 45, 47 from changing extremely.

Spray gun 1 for paint according to the first embodiment
Experiments were conducted under the conditions shown in Table 1. Further, as a comparative example, the bypass orifice 31 was not provided, and an experiment was conducted under the conditions shown in Table 2 using a paint spray gun similar to the paint spray gun 1 according to the first embodiment in other structures. The results of this experiment show that when the bypass orifice 31 is provided as shown in Table 1, the injection air pressure from the spray orifices 45 and 47 can be maintained at about 69 KPa even when the pattern control valve 93 is fully opened. When the pattern control valve 93 is fully opened, a spray gun for paint without a bypass orifice may greatly reduce the spray air pressure from the spray orifice and maintain the spray air pressure necessary for forming a clean painted surface. could not.

Further, in the paint spray gun 1, the air jetted from the spray orifices 45, 47 is depressurized by the depressurization orifice 85, and the pattern adjusting orifice 51,
The large-diameter portion 94 of the shaft 91 is supplied with the air jetted from 53.
Since the pressure is reduced by the gap between the air chamber 9 and the inner peripheral surface of the air chamber 9, it is possible to simplify the mechanism for reducing the pressure of the air.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the present invention is not limited to the case where the design is changed without departing from the scope of the present invention. Included in the invention. For example, as in the second embodiment shown in FIG. 6, the bypass orifice 123 may be formed so as to connect the pattern air chamber 55 and the injection orifice 45. The size and number of the bypass orifices 31 and 123 may be changed appropriately. In the above embodiment,
Although the paint is introduced into the paint chamber 11 from the paint cup 106, the paint may be introduced into the paint chamber 11 from a hose connected to the paint tank.

In the above embodiment, the air jetted from the pattern adjusting orifices 51 and 53 is decompressed by the gap between the large diameter portion 94 of the shaft 91 and the inner peripheral surface of the air chamber 9, but FIG. It is also possible to form a decompression orifice 193 on the shaft 191 and to decompress the air jetted from the pattern adjusting orifices 51 and 53 by the decompression orifice 193 as in the third embodiment shown in FIG.

[0042]

As described above, according to the present invention, even if the pattern control valve is opened / closed, there is almost no change in the injection air pressure from the spray orifice, and a sufficient spray air pressure of the spray orifice is always maintained. You will be able to.

According to the invention of claim 2, the air jetted from the atomizing orifice is depressurized by the depressurizing orifice,
Since the air jetted from the pattern adjusting orifice is depressurized by the gap between the shaft and the inner peripheral surface of the air chamber, the mechanism for depressurizing the air can be simplified. According to the invention of claim 3, the air jetted from the atomizing orifice is depressurized by the depressurizing orifice, and the air jetted from the pattern adjusting orifice is provided inside the depressurizing cylinder with the shaft supporting the pattern adjusting valve. Since the pressure reducing orifice for reducing the pressure of the air supplied to the pattern adjusting orifice is provided on the shaft, the mechanism for reducing the pressure of the air can be simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a paint spray gun according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is an exploded perspective view of a paint spraying portion of the paint spray gun according to the first embodiment of the present invention.

FIG. 4 is a side view of the paint nozzle of the paint spray gun according to the first embodiment of the present invention.

FIG. 5 is a front view of the paint nozzle of the paint spray gun according to the first embodiment of the present invention.

FIG. 6 is a partially enlarged sectional view of a paint spray gun according to a second embodiment of the present invention.

FIG. 7 is a partially enlarged sectional view of a paint spray gun according to a third embodiment of the present invention.

FIG. 8 is a diagram showing an overall configuration of a paint spray gun and an apparatus for operating the paint spray gun.

[Explanation of symbols]

 1 Paint Spray Gun 3 Gun Body 9 Air Chamber 11 Paint Chamber 31, 123 Bypass Orifice 45, 47 Spray Orifice 51, 53 Pattern Control Orifice 85 Pressure Reduction Orifice 91, 191 Shaft 93 Pattern Control Valve 94 Large Diameter 193 Pressure Reduction Orifice

[Table 1]

[Table 2]

Claims (3)

[Claims] 1. A gun main body, a paint chamber formed in the gun main body to which paint is supplied, a paint discharge port for discharging the paint supplied to the paint chamber, and a hose formed in the gun main body. An air chamber to which air is supplied, an atomizing orifice that communicates with the air chamber and discharges air to atomize and spray the paint discharged from the paint discharge port, and is connected to the air chamber to be sprayed. An orifice for pattern adjustment that discharges air to adjust the pattern shape of the existing paint,
A paint spray gun having a pattern adjusting valve for adjusting the air sent from the air chamber to the pattern adjusting orifice, comprising a bypass orifice connecting the spraying orifice and the pattern adjusting orifice. Spray gun for paint. 2. The decompression cylinder according to claim 1, wherein the decompression cylinder is arranged so as to form a gap as an air passage between the decompression cylinder and the inner surface of the air, a sealing portion for sealing the gap as the air passage, and the decompression cylinder. A pressure reducing orifice formed so as to communicate with the inner peripheral surface and the outer peripheral surface of the pressure reducing cylinder, the gap forming the air passage communicates with the atomizing orifice of the pressure reducing cylinder, and the inside of the pressure reducing cylinder has the structure described above. Prepared to communicate with the pattern adjustment orifice,
In addition, the pattern control valve and the shaft supporting the pattern control valve are provided inside the pressure reducing cylinder, and the gap between the shaft and the inner peripheral surface of the pressure reducing cylinder is depressurized for the air supplied to the pattern control orifice. A paint spray gun characterized by being set to a size that allows 3. The pressure reducing cylinder body according to claim 1, wherein the pressure reducing cylinder body is arranged so as to form a gap serving as an air passage between the air chamber interior surface, a sealing portion for sealing the gap serving as the air passageway, and the pressure reducing cylinder body. A pressure reducing orifice formed so as to communicate with the inner peripheral surface and the outer peripheral surface of the pressure reducing cylinder, the gap forming the air passage communicates with the atomizing orifice of the pressure reducing cylinder, and the inside of the pressure reducing cylinder has the structure described above. Prepared to communicate with the pattern adjustment orifice,
Moreover, the pattern control valve and a shaft supporting the pattern control valve are provided inside the pressure reducing cylinder, and a pressure reducing orifice for reducing the pressure of the air supplied to the pattern adjusting orifice is provided on the shaft. Spray gun for paint.