JP2002282741A - Pattern control apparatus for spray gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a control valve for the quantity of patterning air, which is capable of rapidly setting the control valve to a totally enclosed position, a totally opened position and a middle position with a simple operation of a controller and dispenses with complicated working or attaching complicated switching parts, as the structure of the control valve for the quantity of the patterning air to control or change the spray pattern of an air spray gun to a elliptic shape or a circular shape. SOLUTION: The control valve abutting on and separating from a valve hole arranged in a flow passage for the patterning air linearly to the valve hole is provided by being repulsed with a repulsive member in a separating direction from the valve hole and is formed so as to be operated from the outside, and a load change imparting means for changing the operation load on the control valve is positioned in the middle position between a position in contact with the valve hole and the totally opened position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In a spray gun, a spray pattern is formed by spraying paint or the like from a nozzle and atomizing it by air pressure, or by directly supplying a paint or the like under high pressure and atomizing directly from the nozzle. The present invention relates to a method of controlling a pattern air flow for deforming a pattern into a round shape or an elliptical shape.

[0002]

2. Description of the Related Art In a spray gun in which a paint or the like is atomized by air pressure for coating, compressed air supplied to the spray gun is atomized air for atomizing paint sprayed from a nozzle inside the spray gun. And a pattern air stream for deforming the atomized shape of the group of atomized paint particles by the air stream. When the pattern air control valve (hereinafter, referred to as a control valve) provided in the air flow path of the pattern air flow is fully closed and the pattern air flow is stopped, the pattern shape becomes a round shape. When the pattern air flow is increased by fully opening the pattern, the pattern shape becomes an elliptical shape. Further, by setting the control valve at an intermediate position between the fully closed position and the fully opened position, the pattern shape can be set to an intermediate shape between the round shape and the elliptical shape.

[0003] The coating operator can adjust the pattern shape to a pattern shape suitable for the shape and size of the coated object by making the pattern shape a round shape, an elliptical shape, or an intermediate shape, thereby performing the coating efficiently. Indispensable function for. However, in the conventional spray gun, a pattern air adjusting device (hereinafter, referred to as an adjusting device) for adjusting a control valve is configured as shown in FIG. 5 and is attached to a gun body 50, and an operator operates an adjusting knob 51. When rotated, the control valve 52 moves back and forth by the screw 58. And the control valve 52
When the pattern air flow advances and closes the valve hole 54 into which the pattern air flow flows into the air cap 53, the ejection of the pattern air flow from the pattern air hole 55 of the air cap 53 stops, so that the pattern shape of the circular shape 56 is formed. .

When the operator rotates the adjustment knob 51, the control valve 52 is retracted, and the tip of the control valve 52 is separated from the valve hole 54, the pattern air flow flows into the air cap 53 and the pattern air in the air cap 53. Inject from hole 55. The paint ejected from the paint nozzle 57 is atomized by the atomizing airflow, and the pattern airflow deforms the formed circular shape 56, so that the control valve 52
When the pattern airflow increases according to the amount of retreat, the pattern shape can be deformed in a direction approaching the elliptical shape.

In this case, in order to rotate the control valve 51, the right hand must hold the spray gun and operate the trigger 59 with the right index and middle fingers, so that the left adjustment knob 51 must be rotated. However, in the painting operation, the left hand may be used for rotating the painted object or for routing the air hose or the paint hose to the spray gun, and is not always in a freely usable state. Furthermore, in the case of a painted object having a complicated shape, it is necessary to frequently change the pattern shape at the same time as changing the direction of the painted object with the left hand so that the painted surface is in front of the worker. Since it is rotated, there is a problem that workability is greatly reduced.

[0006] In particular, when the interior of a deep part is painted with a painted object having a depth and the distance between the spray gun and the painted object is large, the sprayed paint particles reach the painted object and remain in the elliptical shape. The degree of scattering before the particles adhere increases, and efficient painting cannot be performed. For this reason, an operator increases the paint particle density of the spray pattern by making it round or close to a round shape, and operates so that the paint sufficiently reaches and adheres to the paint. As a result, in the case of a painted object having a complicated shape with a depth, it is necessary to adjust the front part and the wide part in an elliptical shape, and to adjust the depth part and the narrow part in a round shape or an intermediate shape between them in a timely manner. Therefore, it is necessary to rotate the adjustment knob 51 with the left hand every time, and there is a problem that the workability is greatly reduced.

As a means for solving such a problem,
The present applicant has proposed Japanese Patent Publication No. Hei 7-12451 "Air Hand Spray Gun with Pattern Control Mechanism" and Japanese Utility Model Application No. 61-118666 "Pattern Adjuster for Spray Gun". It was not possible to adjust the pattern air conditioner and change only the pattern shape without easily changing the discharge amount. In addition, JP
-245860 In the "fluid flow control device", the control valve is linearly operated back and forth by a complicated mechanism to move the control valve between the first position and the second
Although it is possible to perform positioning with respect to positions, it has not been able to cope with the problem that only two positions can be set and the desire to operate easily with a simpler and cheaper configuration.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a pattern air control valve for adjusting and changing the spray pattern of a spray gun into an elliptical or round shape. Simple operation of the device can be performed, and the control valve can be quickly set to the fully closed position, fully open position, and intermediate position, and there is no need to install complicated processing and complicated switching parts in the configuration of the pattern air amount control valve. It is an object to provide a configuration at low cost.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem. It is possible to quickly set not only the fully closed position and the fully opened position but also the intermediate position by changing the operation load of the control valve.

That is, according to the present invention, in a spray gun for ejecting a liquid from a nozzle to atomize it with compressed air and attaching the sprayed liquid to an object to be coated, a pattern air for ejecting an air cap to deform a spray pattern shape. A control valve that linearly abuts and separates from a valve hole disposed in a flow passage for use with a spray member in a direction separating from the valve hole, and the control valve is provided with the spray gun. And a load change applying means for changing an operation load of the control valve at a position intermediate between a position in contact with the valve hole and a fully open position.

Further, the load change applying means is configured to generate a load change by causing a resistance member disposed in a resilient state to a groove portion or a fixed protrusion formed in the control valve. Alternatively, the load change applying means may be configured such that the spring member for springing the control valve comprises a first spring member and a second spring member. When the force is applied, the elastic force of the second elastic member is added at the intermediate position. further,
A lever was connected to the control valve, and an operating portion of the lever was disposed at a position where finger operation was easy.

[0012]

FIG. 1 is a sectional view showing an entire configuration of a spray gun according to an embodiment of the present invention, and FIG. 2 is a view showing an intermediate position of a control valve. 3A and 3B are cross-sectional views of another embodiment of the control valve, in which FIG. 3A is a view in a fully opened state and FIG. 3B is a view showing an intermediate position. FIG. 1 is a cross-sectional view of an air spray gun equipped with an adjusting device for linearly moving and controlling a pattern air flow, in which compressed air is supplied from an air source (not shown) to a joint 7 for introducing compressed air. Supplied and triggered 1
8 is pulled, the paint valve 17 is actuated and the air valve 9 is operated.
Is opened, and the compressed air flows from the flow channel 8 to the flow channel 10 and the flow channel 11. The compressed air that has flowed into the flow path 11 flows into the air cap 15 through the passage hole 20, and the paint supplied from the paint joint 19 is supplied to the center 16 of the tip of the air cap 15.
To form a spray pattern 21.

A part of the compressed air flowing through the flow path 11 is supplied from the valve hole 12 to the pattern air flow path 13 of the air cap 15.
The spray pattern 21 is deformed when ejected from the ejection hole 14. As a result, when the pattern air flow is ejected from the ejection hole 14, the spray pattern 21 becomes elliptical, and when the ejection of the compressed air from the ejection hole 14 is stopped, the spray pattern 21 becomes round.
The degree of deformation of the spray pattern 21 into an elliptical shape can be adjusted by adjusting the amount of compressed air ejected from the ejection holes 14.

The adjusting device 1 is attached to the rear of the spray gun 22 as a device for adjusting the amount of air of the pattern air flow ejected from the ejection holes 14. The guide 3 is screwed into the main body 23 so that the rear shaft 2a of the control valve 2 slides in the center of the guide 3, and between the guide 3 and the press fitting 4 attached to the end of the rear shaft 2a. Spring 5
Is installed. As a result, the control valve 2 is always pulled backward by the spring 5, and the guide 3 is in a state where the step 2 b hits the guide 3. In this state, the control valve 2 and the valve hole 12 are fully open, and the compressed air flowing through the flow path 11 passes through the valve hole 12 and is ejected from the ejection hole 14, so that the spray pattern 21 has a large elliptical shape. Shape.

Next, when the pusher 4 is pushed with the thumb of the hand holding the spray gun 22, the control valve 2 moves forward and the valve hole 12
The pattern air flow that has flowed into the flow path 11 while contacting the
Can be stopped flowing into. In this state,
The control valve 2 and the valve hole 12 are fully closed, and the pattern airflow that has flowed through the flow path 11 does not flow through the valve hole 12. Since it cannot be deformed, it has a round shape.

FIG. 2 is a detailed view of the adjusting device, in which a groove 2C is formed in the rear shaft 2a. Further, a load change applying means 24 is attached to the guide 3, and the contact body 24a is pressed against the surface of the rear shaft 2a by a spring 24b. As a result, when the operator pushes the push fitting 4 with the thumb and the contact body 24a falls into the groove 2C, the operator can feel a change in the operation load. At this time, control valve 2
Is set to have an appropriate opening with respect to the valve hole 12, so that the worker can easily reproduce the intermediate position by stopping the pushing operation of the push fitting 4 at this position. Becomes In this case, when the operator further presses the pusher 4, the control valve 2 closes the valve hole 12 to be in a fully closed state. On the other hand, when the operator stops pressing the pusher 4, the control valve 2 is pulled backward by the spring 5 and immediately becomes fully open, so that the operator moves the control valve 2 to the fully closed position, the fully open position and the intermediate position. It is possible to provide an inexpensive configuration that can be set quickly and that does not require complicated processing and installation of complicated switching parts in the configuration of the control valve for the amount of pattern air. In this embodiment, the rear shaft 2a is provided with the groove 2C. However, instead of the groove 2C, a protrusion (not shown) is formed on the rear shaft 2a.
May be provided.

FIG. 3 shows another embodiment of the adjusting device.
1, an intermediate guide 25 is screwed into the rear shaft 30a.
, A slide component 27 is movably inserted.
A push fitting 28 is attached to the end of the rear shaft 30a, and a spring 29 is provided between the push fitting 28 and the intermediate guide 25.
a, the control valve 30 is always pulled backward by the spring 29a, and the guide 31 has a step 30b.
Has been hit. Further, a spring 29 b is mounted between the guide 31 and the slide component 27, and the slide component 27 is pressed against the intermediate guide 25.

In the state shown in FIG. 3A, when the push fitting 28 is pushed in, the spring 29a is first compressed, and then, FIG.
When the push fitting 28 comes into contact with the slide component 27 as shown in FIG.
The operator feels the load of both the spring a and the spring 29b, and the operator receives a change in resistance during the operation of the push fitting 28, and can grasp the intermediate position between the fully closed position and the fully opened position as a touch. Further, since the intermediate guide 25 is screwed into the guide 31, the degree of screwing is adjusted and fixed with the lock nut 26, so that when the pusher 28 is pushed in, the position at which the pusher 28 comes into contact with the slide component 27, That is, the intermediate position can be adjusted.

In FIG. 2, a pusher 4 has a lever 4a.
Is attached, the operator presses the push fitting 4 with the thumb of the hand holding the spray gun.
By pressing the lever 4a that protrudes to the side, the operation can be facilitated. Further, as shown in FIG. 4, a specially shaped lever 4b is attached to the push fitting 4 so that the thumb of the hand holding the spray gun can easily push the push fitting 4, so that the lever operating section 4c is located near the thumb. May be provided, and even when the operator frequently operates the adjusting device, the fatigue of the thumb can be reduced.

The means for changing the resistance during operation of the control valve is not limited to the above embodiment, but various methods can be used. Further, other than the air spray gun, the present invention can also be used for controlling the pattern air flow of an air assist spray gun of a system in which a paint or the like is supplied under high pressure and atomized directly from a nozzle.

[0021]

As described above, the pattern air amount adjusting device for adjusting / changing the spray pattern of the spray gun into an elliptical shape or a circular shape can be operated by a simple operation so that the control valve can be fully closed and fully opened. It is possible to provide an inexpensive configuration that can be quickly set to the intermediate position and that does not require complicated processing and complicated switching parts to be attached to the configuration of the pattern air amount control valve.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a spray gun according to an embodiment of the present invention.

FIG. 2 is a detailed sectional view of a control valve.

3A and 3B are diagrams showing another embodiment of the control valve, wherein FIG. 3A is a diagram in a fully opened state and FIG. 3B is a diagram showing an intermediate position.

FIG. 4 is a diagram in which a specially shaped lever is mounted.

FIG. 5 is a view showing a configuration of a spray gun showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjusting device 2 Control valve 4 Push fitting 4a Lever 4b Lever 4c Operation part 5 Spring 12 Valve hole 24 Load change giving means 24a Resistance member 25 Intermediate guide 27 Slide part 29a Spring 29b Spring 30 Control valve

Claims (4)

[Claims] 1. A spray gun for ejecting a liquid from a nozzle to atomize it with compressed air and adhering the sprayed liquid to an object to be coated, a flow path for pattern air ejecting from an air cap to deform a spray pattern shape. A control valve that linearly abuts and separates from the valve hole disposed in the spray gun is resiliently provided in a direction separating from the valve hole, and the control valve is operated from outside the spray gun. And a load change applying means for changing an operation load of the control valve at an intermediate position between a position abutting on the valve hole and a fully open position. 2. A structure in which the load change applying means generates a load change by contacting a resistance member disposed in a resilient state with a groove or a fixed projection formed in the control valve. The spray gun according to claim 1, wherein: 3. The load change applying means, wherein the resilient member for repelling the control valve is composed of a first resilient member and a second resilient member, and when the control valve is pushed in, the first resilient member is first provided. The spray gun according to claim 1, wherein an elastic force of the second elastic member is received at the intermediate position, and an elastic force of the second elastic member is added at the intermediate position. 4. The spray according to claim 1, wherein a lever is connected to the control valve, and an operating portion of the lever is arranged at a position where a finger can be easily operated. gun.