JPH0663157U - Air spray gun paint adjustment device - Google Patents

Abstract

(57) [Summary] [Purpose] When adjusting the paint adjustment knob of an automatic or hand air spray gun, prevent the twisting phenomenon by the spring provided in the inner annular recess of the paint adjustment knob to prevent the paint adjustment knob. The smooth rotation facilitates the positioning of the paint control knob and prevents the generation of abnormal noise during rotation. [Composition] Between the rear end of the air spray gun main body and the inner annular recess of the paint adjusting knob, from the inner annular recess side,
A paint adjusting device for an air spray gun, which is configured by incorporating a sphere consisting of one piece, an annular flat plate, and a spring in this order.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paint adjusting device for adjusting the spray amount of paint in an air spray gun.

[0002]

[Prior art]

 When changing the coating conditions for an air spray gun, one of the changes is adjusting the amount of paint spray. This adjustment is performed by rotating the paint adjustment knob attached to the position projecting rearward from the spray gun main body so that the needle valve allowance, that is, the needle valve trigger in the hand gun, and the automatic gun in the automatic gun. In addition, the amount of movement of the tip of the needle valve rearward from the opening of the paint nozzle is regulated to a desired amount when each of the built-in air pistons is pulled rearward. The larger the area, the larger the opening area of the paint nozzle and the larger the amount of paint sprayed.

[0003]

[Problems to be solved by the device]

 However, since the spring is pressed directly against the inner annular recess of the paint adjustment knob, when the paint adjustment knob is rotated, the spring that is in line or surface contact with the inner annular recess also rotates. A twist phenomenon occurs in the direction. Therefore, the spring exerts a restoring force that tries to eliminate this twisting phenomenon, and if this restoring force is stronger than the frictional force of the mounting screw at the rear end of the spray gun body of the paint adjusting knob, the paint adjusting knob is used to restore the restoring force of the panel. In other words, it is rotated in the direction, that is, in the direction returning to the twist. Therefore, even if the positioning is performed with the paint adjustment knob, the position may change, and the positioning is not easy. Furthermore, when the paint control knob is rotated for adjustment, the spring end surface rubs against the inner annular recess of the paint control knob, which may cause a clicking noise and / or the rotation may not be smooth. In view of such a problem, the present invention aims to smooth the rotation of the paint adjusting knob by eliminating the above-mentioned twisting phenomenon caused by the spring, and to improve the positioning accuracy of the paint adjusting knob.

[0004]

[Means for Solving the Problems]

 The present invention provides an air cap at the tip of the spray gun body, a paint nozzle inside the air cap, a needle valve in the paint nozzle, and a tip of the needle valve behind the needle valve. An air spray gun in which a needle valve spring for pressing the opening of the paint valve is attached to the rear end of the needle valve to attach a paint adjusting core rod, and a paint adjusting knob is attached to the rear end of the paint adjusting core rod. In the order of a spherical body, an annular flat plate, and a spring, which are formed in this order from the inner annular recess side, between the rear end of the spray gun body and the inner annular recess of the paint adjusting knob. Is.

[0005]

[Action]

 Between the rear end of the spray gun body and the inner annular recess of the paint control knob, a spherical body consisting of one piece, an annular flat plate, and a spring were assembled in this order from the inner annular recess side. When the paint control knob is rotated during the adjustment of the paint, the spring itself rotates the paint between the annular flat plate and the inner annular recess in the inner annular recess of the paint control knob. It does not receive torsional force due to the rotation of the adjustment knob, and only requires simple compression. Therefore, it is possible to smoothly rotate the paint adjusting knob, and it is possible to improve the positioning accuracy since the once adjusted positioning does not come.

[0006]

【Example】

 Fig. 1 shows a reciprocator coating device that attaches a spray gun to perform vertical movement or horizontal movement, and an automatic air spray gun that is attached to a painting robot and performs painting. Reference numeral 1 is a spray gun main body, which has a central air hole 2a for atomizing the paint at the tip 1a of the main body, an auxiliary air hole 2b symmetrically formed at a position close to the central air hole 2a, and a spraying pattern flatly sprayed. The air cap 2 having the square holes 2c, which are turned into circular blowouts, at symmetrical positions is detachably attached with screws.

A paint nozzle 3 a is attached to the inside of the air cap 2 by being detachably screwed to the spray gun body 1. A passage nozzle 3a is formed in the center of the paint nozzle 3 so that the outer periphery of the tip of the paint nozzle 3 enters the center air hole 2a of the air cap 2 and the inside of the center air hole 2a. It is attached so as to form an air passage for atomizing the paint in an annular gap formed by the circumference and the outer circumference of the front end of the paint nozzle 3. In the paint nozzle 3, the tip closes the opening passage of the paint nozzle 3 or adjusts the opening degree to adjust the amount of paint sprayed from the opening of the paint nozzle 3 toward the object to be coated. A needle valve 4 for adjusting is arranged. Behind the needle valve 4, a needle valve spring 5 for pressing the tip of the needle valve 4 toward the opening side of the paint nozzle 3 is attached, and further, the needle valve spring 5 is approached to the rear end of the needle valve 4 to adjust the paint adjusting core. A rod 6 is provided, and a paint adjusting knob 7 is integrally attached to a rear end of the paint adjusting core rod 6 with a set screw 8. The paint adjusting rod 6 and the paint adjusting knob 7 may be integrally formed by another method instead of screwing.

Here, between the rear end 1b of the spray gun body 1 and the inner annular recess 7a of the paint adjusting knob 7, from the inner annular recess 7a side, a sphere 9 made of a steel ball is formed. The annular flat plate 10 having the shape of a plain washer and the spring 11 are assembled in this order. Here, a scale plate 12 as shown in FIG. 2 is attached to the rear end 1b of the spray gun body 1 so that the degree of adjustment does not rotate by feeling, but can be grasped by a numerical value. ing. Furthermore, after adjustment, a lock screw 13 for locking the paint adjusting knob 7 is provided between the rear end 1b of the spray gun body 1 and the paint adjusting knob. Further, this automatic air spray gun has a mounting round hole 1c formed in the spray gun body 1 so that it can be mounted by penetrating into a mounting stage made of a round bar of a reciprocator.

Further, the spray gun body 1 is formed with a flat surface portion 1d and a screw portion for mounting on the flat surface portion 1d so that the flat surface mounting portion of the coating robot can be mounted with a bolt or the like. In addition, since the automatic air spray gun uses a method in which the needle valve 4 is moved rearward by using compressed air supplied from the outside, the needle valve 4 is integrated with the needle valve 4 behind the needle valve 4. A piston 4a is attached, and a piston pushing spring 14 is arranged at the back of the piston 4a.

With the above configuration, when adjusting the amount of paint sprayed from the spray gun, rotate the paint adjusting knob 7 according to the desired number on the scale plate 12, and then use the locking screw 13. It will be locked and completed. Here, when the paint adjusting knob 7 is rotated, the spring 11 is provided in the inner annular recess 7a of the paint adjusting knob 7 through one spherical body 9 made of a steel ball and the annular flat plate 10. Since the spherical body 11 makes point contact movement with the inner annular concave portion 7a while rolling, the spring 11 does not experience any torsion phenomenon, and only the pressing force acts via the annular flat plate 10. , The paint adjusting knob 7 can be rotated very smoothly.

After the pulling margin of the needle valve 4 is determined in this way, when compressed air is supplied to the left side of the piston 4 a, the needle valve 4 is retracted to the position adjusted by the paint adjusting knob 7. Then, a desired amount of paint is ejected from the opening of the paint nozzle 3, is atomized by the compressed air discharged from the center hole 2a of the air cap 2, is further atomized in the auxiliary air hole 2b, and is discharged from the square hole 2c. Hirabuki Marubuki is adjusted by air and is used for painting. Up to now, the automatic air spray gun has been described, but the present invention is not limited to this, and can be applied to the paint adjusting knob of the hand gun as shown in FIG.

[0011]

[Effect of device]

 When rotating the paint control knob, the inner annular recess and the spherical body move while making point contact with the spherical body and the annular flat plate arranged inside. It is possible to prevent the occurrence of this phenomenon, which allows the paint control knob to rotate smoothly, facilitates positioning, and eliminates the clicking noise.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic air spray gun incorporating the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a partially enlarged view of the paint control knob of FIG.

FIG. 4 is an enlarged view of a paint adjusting knob portion when applied to a hand air spray gun in another embodiment of the present invention.

[Explanation of symbols]

 4 Needle valve 5 Needle valve spring 7 Paint adjustment knob 7a Inner annular recess of paint adjustment knob 9 Sphere 10 Annular flat plate 11 Spring

Claims (2)

[Scope of utility model registration request] 1. A spray gun main body having an air cap at the tip thereof, a paint nozzle inside the air cap, a needle valve inside the paint nozzle, and a tip of the needle valve behind the needle valve and the paint nozzle. Air spray consisting of a needle valve spring for pressing the opening of the paint valve, a paint adjusting core rod near the rear end of the needle valve, and a paint adjusting knob at the rear end of the paint adjusting core rod. In the gun, between the rear end of the spray gun main body and the inner annular recess of the paint adjusting knob, one spherical body, an annular flat plate, and a spring are assembled in this order from the inner annular recess side. Air spray gun paint control device. 2. The paint adjusting device for an air spray gun according to claim 1, wherein the sphere is a steel ball.