JP4588237B2 - Spray gun pattern adjuster - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In spray guns, paint patterns are sprayed from nozzles and atomized by air pressure, or spray patterns formed by spraying paint etc. at high pressure and directly atomizing from nozzles are transformed into round or elliptical shapes. It is related with the control method of the pattern air flow for making it.
[0002]
[Prior art]
In a spray gun that paints by spraying paint etc. with air pressure, the compressed air supplied to the spray gun includes an atomizing air flow for atomizing paint sprayed from the nozzle inside the spray gun, and this fog. The atomized shape of the formed paint particle group can be divided into a pattern air flow for deforming the so-called spray pattern shape with an air flow. When the pattern air control valve (hereinafter referred to as the control valve) provided in the air flow path of the pattern air flow is fully closed and this pattern air flow is stopped, the pattern shape becomes a round shape. When the pattern air flow is increased by fully opening, the pattern shape becomes an elliptical shape. In addition, the pattern shape can be an intermediate shape between a round shape and an elliptical shape by setting the control valve to an intermediate position between the fully closed position and the fully open position.
[0003]
The painter can make the pattern shape suitable for the shape and size of the painting by making the pattern shape round, oval or intermediate, which is indispensable for efficient painting Function. However, in a conventional spray gun, a pattern air conditioner (hereinafter referred to as an adjuster) that adjusts a control valve is configured as shown in FIG. 5 and attached to the gun body 50, and an operator adjusts the adjustment knob 51. When rotating, the adjusting valve 52 moves back and forth by the screw 58. Then, when the control valve 52 moves forward to close the valve hole 54 through 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. A shape is formed.
[0004]
When the operator rotates the adjustment knob 51 to retract the adjustment valve 52 and the tip of the adjustment valve 52 moves away from the valve hole 54, the pattern air flow flows into the air cap 53 and from the pattern air hole 55 of the air cap 53. Spray. The paint sprayed from the paint nozzle 57 is atomized by the atomized air flow, and the pattern air flow deforms the pattern shape of the formed round shape 56. Therefore, when the pattern air flow increases according to the retraction amount of the control valve 52, The pattern shape can be deformed in a direction approaching an elliptical shape.
[0005]
In this case, in order to rotate the adjustment valve 51, the right hand holds the spray gun and operates the trigger 59 with the index finger and middle finger of the right hand, so it is necessary to rotate the adjustment knob 51 with the left hand. However, in painting operations, the left hand may be used to rotate the object to be painted or to route the air hose or paint hose to the spray gun. Furthermore, in the case of a complex-shaped painted object, it is necessary to change the direction of the painted object with the left hand so that the painted surface comes in front of the operator, and at the same time, the pattern shape must be changed frequently. Since it is rotated, there is a problem in that workability is greatly reduced.
[0006]
In particular, when painting the interior with a deep paint, if the distance between the spray gun and the paint is large, the sprayed paint particles will reach the paint and adhere to the paint if it remains oval. As the degree of splashing increases, efficient painting cannot be performed. For this reason, the 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 can reach and adhere to the paint sufficiently. As a result, it is necessary to adjust in a timely manner so that the front and wide parts are painted with an elliptical shape, and the back and narrow parts are painted with a round shape and an intermediate shape between the two in the case of a deep and complicated shape. For this reason, the adjustment knob 51 has to be rotated with the left hand each time, resulting in a problem that workability is greatly reduced.
[0007]
As a means to solve such problems, the applicant proposes Japanese Patent Publication No. 7-12451 “Air Hand Spray Gun with Pattern Control Mechanism” and Japanese Utility Model No. 61-118666 “Spray Gun Pattern Adjuster”. However, at any time, it was impossible to change only the pattern shape by adjusting the pattern air conditioner without simply changing the discharge amount with only one hand. In Japanese Patent Laid-Open No. 61-245860, “fluid flow control device”, the control valve can be linearly operated back and forth with a complicated mechanism to position the control valve in the first position and the second position. The problem that only two positions can be set and the demand for simple operation with a simple and inexpensive configuration could not be met.
[0008]
[Problems to be solved by the invention]
In the present invention, in the control valve configuration of the pattern air amount for adjusting and changing the spray pattern of the spray gun to an elliptical shape or a round shape, a simple operation of the adjusting device can be performed with a finger of the hand holding the spray gun, It is possible to quickly set the control valve to the fully closed position, fully open position, and intermediate position, and to provide an inexpensive configuration that does not require complicated processing and complicated switching parts to be installed in the pattern air volume control valve configuration It is what.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention enables the pattern air amount to be throttled by simply pushing the control valve that is fully opened by the elastic member with the thumb of the hand holding the spray gun. In addition to the fully open position, it can be quickly set to an intermediate position by changing the operating load of the control valve.
[0010]
That is, in the present invention, in a spray gun in which liquid is ejected from a nozzle and atomized with compressed air, and the sprayed liquid adheres to an object to be coated, a flow for pattern air that is ejected from an air cap and deforms the spray pattern shape. A regulating valve that linearly abuts against and opens from the valve hole disposed in the passage is provided by a resilient member in a direction to release from the valve hole, and the regulating valve is provided from the outside of the spray gun. In addition to being configured to be operable, load change applying means for changing the operation load of the control valve is provided at an intermediate position between the position in contact with the valve hole and the fully open position.
[0011]
Further, the load change applying means is configured to generate a load change when a resistance member disposed in a resilient state abuts against a groove portion or a fixed protrusion portion engraved in the control valve, or the load The change imparting means is configured such that the resilient member for projecting the adjusting valve is composed of a first resilient member and a second resilient member, and when the regulating valve is pushed in, first, the resilient member receives only the resilient force of the first resilient member. The elastic force by the second elastic member is added at the intermediate position. Furthermore, a lever was connected to the control valve, and the operation portion of the lever was arranged at a position where it could be easily operated by a finger.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a sectional view showing the overall structure 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. FIG. 3 is a cross-sectional view of another embodiment of the control valve, where (a) is a fully opened state and (b) is a diagram illustrating an intermediate position.
FIG. 1 is a cross-sectional view of an air spray gun equipped with an adjusting device that moves linearly to control a pattern air flow. The compressed air is supplied from an air source (not shown) to a joint 7 for introducing the compressed air. When supplied and the trigger 18 is pulled, the paint valve 17 is activated and the air valve 9 is opened, and the compressed air flows from the flow path 8 to the flow paths 10 and 11. The compressed air that has flowed into the flow path 11 flows into the air cap 15 from the passage hole 20, and the paint supplied from the paint joint 19 is atomized at the front end center portion 16 of the air cap 15 to form a spray pattern 21.
[0013]
Further, a part of the compressed air that has flowed into the flow path 11 flows into the pattern air flow path 13 of the air cap 15 from the valve hole 12, and when sprayed from the spray hole 14, the spray pattern 21 is deformed. As a result, when the pattern air flow is ejected from the ejection hole 14, the spray pattern 21 becomes elliptical, and when the compressed air stops ejecting from the ejection hole 14, 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 hole 14.
[0014]
The adjusting device 1 is attached to the rear portion 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 to 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 pressing metal 4 attached to the end of the rear shaft 2a. Is mounted with a spring 5. As a result, the regulating valve 2 is always pulled rearward by the spring 5 and the step 2b hits the guide 3. In this state, the control valve 2 and the valve hole 12 are fully opened, and the compressed air that has flowed into the flow path 11 passes through the valve hole 12 and is ejected from the ejection hole 14, so that the spray pattern 21 is greatly elliptical. To deform.
[0015]
Next, when the metal fitting 4 is pushed with the thumb of the hand holding the spray gun 22, the control valve 2 moves forward and comes into contact with the valve hole 12, and the pattern air flow that has flowed into the flow path 11 flows into the valve hole 12. Can be stopped. In this state, the control valve 2 and the valve hole 12 are fully closed, and the pattern air flow that has flowed through the flow path 11 does not flow into the valve hole 12. Since the spray pattern 21 cannot be deformed, it has a round shape.
[0016]
FIG. 2 is a detailed view of the adjusting device, and a groove 2C is formed on 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 metal 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, by setting the control valve 2 so as to have an appropriate opening degree with respect to the valve hole 12, the operator can easily change the intermediate position by stopping the pushing operation of the pusher 4 at this position. Can be reproduced. In this case, when the operator further presses the metal fitting 4, the control valve 2 closes the valve hole 12 and becomes fully closed. On the other hand, when the operator stops pressing the metal fitting 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, fully open position, and intermediate position. It is possible to provide an inexpensive configuration that can be set quickly and does not require complicated processing or complicated switching parts to be attached to the control valve configuration of the pattern air amount. In this embodiment, the groove 2C is formed on the rear shaft 2a, but a protrusion (not shown) may be provided on the rear shaft 2a instead of the groove 2C.
[0017]
FIG. 3 shows another embodiment of the adjusting device, in which an intermediate guide 25 is screwed into a guide 31, and a slide part 27 is movably inserted into a rear shaft 30a. In addition, a push fitting 28 is attached to the end of the rear shaft 30a, and a spring 29a is mounted between the push fitting 28 and the intermediate guide 25. Therefore, the adjustment valve 30 is always pulled backward by the spring 29a. Thus, the step 30b hits the guide 31. Further, a spring 29 b is mounted between the guide 31 and the slide part 27, and the slide part 27 is pressed against the intermediate guide 25.
[0018]
In the state shown in FIG. 3A, when the pressing member 28 is pushed, the spring 29a is first compressed, and when the pressing member 28 comes into contact with the slide component 27 as shown in FIG. 3B, the spring 29b is compressed. Therefore, the operator feels the load of both the spring 29a and the spring 29b, and the operator receives a resistance change during the operation of the push fitting 28 and grasps the middle position between the fully closed position and the fully opened position as a feel. Can do. In addition, since the intermediate guide 25 is screwed into the guide 31, a position where the metal fitting 28 comes into contact with the slide component 27 when the metal fitting 28 is pushed in by adjusting the degree of screwing and fixing with the lock nut 26. That is, the intermediate position can be adjusted.
[0019]
In FIG. 2, since the lever 4 a is attached to the pressing metal 4, the operator presses the lever 4 a protruding from the side of the pressing metal 4 instead of pressing the pressing metal 4 with the thumb of the hand holding the spray gun. Therefore, it can be made easy to operate. Further, as shown in FIG. 4, in order to make it easier for the thumb of the hand holding the spray gun to push the pusher 4, a lever 4b having a special shape is attached to the pusher 4 so that the lever operating portion 4c is located near the thumb. The operator can reduce fatigue of the thumb even when the operator frequently operates the adjusting device.
[0020]
The means for giving a resistance change during operation of the control valve is not limited to the above embodiment, and various methods can be used. In addition to the air spray gun, it can also be used to control the pattern air flow of an air-assisted spray gun of a type in which paint or the like is supplied under high pressure and atomized directly from the nozzle.
[0021]
【The invention's effect】
As described above, the pattern air volume adjustment device for adjusting and changing the spray pattern of the spray gun to an elliptical shape or a round shape can be quickly set to the fully closed position, fully open position, and intermediate position by simple operation. In addition, it is possible to provide an inexpensive configuration that does not require complicated processing and complicated switching parts to be attached to the control valve configuration of the pattern air amount.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall configuration of a spray gun according to an embodiment of the present invention.
FIG. 2 is a detailed cross-sectional view of a control valve.
FIGS. 3A and 3B are diagrams showing another embodiment of the control valve, in which FIG. 3A is a fully opened state and FIG. 3B is a diagram showing an intermediate position.
FIG. 4 is a diagram with a specially shaped lever attached.
FIG. 5 is a diagram showing a configuration of a spray gun showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Control valve 4 Metal fitting 4a Lever 4b Lever 4c Operation part 5 Spring 12 Valve hole 24 Load change provision means 24a Resistance member 25 Intermediate guide 27 Slide component 29a Spring 29b Spring 30 Control valve

Claims (4)

In a spray gun that sprays liquid from a nozzle, atomizes with compressed air, and adheres the sprayed liquid to the object to be coated, a valve arranged in a flow path for pattern air that sprays from the air cap and deforms the spray pattern shape A regulating valve that linearly contacts and separates from the hole is provided by a resilient member in a direction to separate from the valve hole, and the regulating valve is configured to be operable from the outside of the spray gun. A spray gun is provided with load change applying means for changing the operation load of the control valve at a position intermediate between the position in contact with the valve hole and the fully open position. The load change applying means is configured to generate a load change when a resistance member disposed in a resilient state abuts against a groove portion or a fixed projection portion formed in the control valve. The spray gun according to claim 1. The load change applying means includes a first elastic member and a second elastic member, and the elastic force generated only by the first elastic member when the adjustment valve is pushed in. The spray gun according to claim 1, wherein a resilience by the second resilience member is added at the intermediate position. The spray gun according to claim 1, 2, or 3, wherein a lever is connected to the control valve, and an operation portion of the lever is disposed at a position where the finger can be easily operated.

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