JP2579915Y2 - Air spray gun paint control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint control device for controlling the amount of paint sprayed in an air spray gun.

[0002]

2. Description of the Related Art In an air spray gun, when a coating condition is changed, one of the methods is to adjust the amount of paint sprayed. This adjustment is made by turning the paint adjustment knob attached to the position protruding backward from the spray gun body, so that the needle valve can be triggered, that is, the needle valve can be triggered with a handgun, and the automatic gun can be triggered with a handgun. When each built-in air piston is pulled backward,
The amount by which the tip of the needle valve moves rearward from the opening of the paint nozzle is regulated to a desired amount. In general, the greater the amount of this pull, the larger the opening area of the paint nozzle, and the greater the amount of paint ejected. It is configured to increase.

[0003]

However, since the spring is directly pressed against the inner annular concave portion of the paint adjusting knob, when the paint adjusting knob is rotated, the inner annular concave portion has a line or surface. The spring in contact also causes a twisting phenomenon in the rotation direction at the same time. Therefore, a restoring force acts on the spring to eliminate this torsion phenomenon. If the restoring force is stronger than the friction force of the mounting screw at the rear end of the spray gun body of the paint adjusting knob, the paint adjusting knob is moved in the direction of the spring restoring force. That is, it is rotated in a direction to return to the torsion. Therefore, even if the positioning is performed by the paint adjustment knob, the position may be changed, and the positioning is not easy. Furthermore, when the paint adjusting knob is rotated for adjustment, the spring end face rubs against the inner annular concave portion of the paint adjusting knob, so that a strange noise is generated and the rotation is not smooth. The present invention has been made in view of the above circumstances, and aims to improve the positioning accuracy of the paint adjusting knob by smoothing the rotation of the paint adjusting knob by eliminating the torsion phenomenon caused by the spring.

[0004]

According to the present invention, an air cap is provided at a tip of a spray gun main body, a paint nozzle is provided inside the air cap, a needle valve is provided in the paint nozzle, and a needle valve is provided behind the needle valve. A needle valve spring that presses the tip of the needle valve toward the opening of the paint nozzle, a paint adjustment core rod approaching the rear end of the needle valve, and a paint adjustment knob at the rear end of the paint adjustment core rod. In the air spray gun attached to each, between the rear end of the spray gun body and the inner annular recess of the paint control knob, from the inner annular recess side, one spherical body, an annular flat plate, and a spring. They are built in order.

[0005]

Since a single spherical body, an annular flat plate, and a spring are arranged in this order between the rear end of the spray gun main body and the inner annular concave portion of the paint adjusting knob from the inner annular concave side, When the paint control knob is rotated when adjusting the paint ejection amount, the spring itself is rotated by the rotation of the sphere sandwiched between the annular flat plate and the inner annular recess in the inner annular recess of the paint control knob. Does not require twisting force due to the rotation of the paint control knob, and requires only simple compression. Therefore, the paint adjustment knob can be smoothly rotated, and the positioning once adjusted is not changed, so that the positioning accuracy can be improved.

[0006]

FIG. 1 shows a reciprocator coating apparatus for performing a vertical or horizontal movement by attaching a spray gun, and an automatic air spray gun for performing painting by being attached to a painting robot or the like. 1 is the spray gun body,
A central air hole 2 for atomizing paint at the tip 1a of the main body
a, an auxiliary air hole 2b symmetrically opened at a position close to the center air hole 2a, and an air cap 2 having a square hole 2c for changing the spraying pattern from flat blowing to round blowing at symmetric positions. Is attached.

Inside the air cap 2, the paint nozzle 3 a is detachably screwed into the spray gun body 1.
Is obsessed. The paint nozzle 3 has a passage nozzle 3a penetratingly opened at the center. The outer periphery of the tip of the paint nozzle 3 enters the center air hole 2a of the air cap 2, and the inner circumference of the center air hole 2a. An annular gap formed between the paint nozzle 3 and the outer periphery of the tip of the paint nozzle 3 forms an air passage for atomizing the paint. The paint nozzle 3
Inside, a needle for closing the opening passage of the paint nozzle 3 or adjusting the degree of opening so as to adjust the amount of paint ejected from the opening of the paint nozzle 3 toward the object to be coated. A valve 4 is provided. A needle valve spring 5 for pressing the tip of the needle valve 4 toward the opening of the paint nozzle 3 is attached to the rear of the needle valve 4. 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. Incidentally, the paint adjusting core 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 concave portion 7a of the paint control knob 7, a sphere 9 made of one steel ball from the inner annular concave portion 7a side,
An annular flat plate 10 having the shape of a flat washer and a 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 main body 1 so that the degree of adjustment can be grasped numerically, not by turning. . After adjusting,
Lock screw 13 for locking paint control knob 7
Is disposed between the rear end 1b of the spray gun main body 1 and the paint control knob. The spray gun body 1 is provided with a mounting round hole 1c so that the automatic air spray gun can be mounted by penetrating a mounting stay formed of a round bar of a reciprocator.

Further, the spray gun main body 1 is mounted so that it can be mounted on the flat mounting portion of the painting robot with bolts or the like.
Is formed with a flat portion 1d and a screw portion for mounting on the flat portion 1d. Also, the automatic air spray gun
Since the rearward movement of the needle valve 4 is performed by compressed air supplied from the outside, a piston 4a is attached to the rear of the needle valve 4 integrally with the needle valve 4. A piston pressing spring 14 is provided on the back of the piston 4a.

With the above configuration, when adjusting the amount of paint sprayed from the spray gun, the paint adjustment knob 7 is turned to the desired number on the scale plate 12 and then locked with the lock screw 13. To complete. Here, when the paint adjusting knob 7 is rotated, a spring 11 is disposed in the inner annular concave portion 7a of the paint adjusting knob 7 via a single sphere 9 made of a steel ball and an annular flat plate 10. Since the sphere 11 rolls and makes point contact movement while rolling, the torsion phenomenon does not occur at all with the spring 11, and only the pressing force acts via the annular flat plate 10. Thus, the paint control knob 7 can be rotated very smoothly.

[0010] When the compressed air is supplied to the left side of the piston 4a after the stroke of the needle valve 4 is determined in this way, the needle valve 4 is retracted to the position adjusted by the paint adjusting knob 7, A desired amount of paint is ejected from the opening of the paint nozzle 3, atomized by compressed air coming out of the center hole 2 a of the air cap 2, further atomized by the auxiliary air hole 2 b, and blown flat by air from the square hole 2 c. The round blowing is adjusted and used for painting. Up to now, the automatic air spray gun has been described. However, the present invention is not limited to this, and can be applied to a paint control knob of a hand gun as shown in FIG.

[0011]

Advantages of the Invention When the paint adjusting knob is turned, the inner annular concave portion and the spherical member move while being in point contact with each other by the single spherical member and the annular flat plate disposed inside, so that the spring is twisted. The occurrence of the phenomenon can be prevented, whereby the paint adjusting knob can be smoothly rotated, the positioning can be facilitated, and the operating noise can be eliminated.

[Brief description of the 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 a paint control knob of FIG. 1;

FIG. 4 is an enlarged view of a paint control knob 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 7 9 Spherical Body 10 Annular Flat Plate 11 Spring

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B05B 7/00-7/32 B05B 9/01 B05B 1/30-1/32

Claims (2)

(57) [Scope of request for utility model registration] 1. An air cap at a tip of a spray gun body, 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 with the paint nozzle. An air spray having a needle valve spring pressed against the opening of the needle valve, a paint adjusting core rod approaching the rear end of the needle valve, and a paint adjusting knob attached to 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 concave portion of the paint control knob, from the side of the inner annular concave portion, a single spherical body, an annular flat plate, and a spring are assembled in this order. A paint adjusting device for an air spray gun. 2. The paint control device for an air spray gun according to claim 1, wherein the sphere is a steel ball.