JPH0615203A - Paint ejection valve - Google Patents

Abstract

PURPOSE:To provide a paint ejection valve capable of drawing a very fine and uniformly wide line continuously in varying shading. CONSTITUTION:This paint ejection valve 100 consists of a paint nozzle 5 with an inner paint feed passage, an annular air blowout hole 60 provided surrounding a paint outlet 5, and a valve disc (control rod 2) which is installed in the paint nozzle 5 and operates the paint outlet 50. In addition, the valve 100 ejects paint supplied from the paint outlet 50 with the help of an air blown out of the air blowout hole 60. Further, the valve 100 has a needle 7 jutting out in a blowout direction from the center of the paint outlet 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint injection valve suitable for drawing thin lines of uniform thickness.

[0002]

2. Description of the Related Art A paint injection valve is provided with an annular air injection port coaxially on the outer circumference of a paint nozzle having a paint supply passage inside thereof, and a valve element axially reciprocating in the paint nozzle. Then, it controls the closing of the paint outlet (valve port) and the adjustment of the valve opening, and sprays the paint while adjusting the air injection amount. As a magnifying device that draws a small original image such as a color photograph by enlarging it on a wall, it scans the color of the original image with a detector, controls a robot hand equipped with a paint injection valve for the three primary colors, and ejects it onto the copy surface according to the scanning line. A painting robot for magnified copying is in practical use.

[0003]

In the enlargement copying, there is a strong demand for improving the sophistication and beauty of the drawn picture. For this purpose, it is important to have a paint injection valve that can draw as thin a line as possible with a uniform width so that the shade of the color changes continuously. An object of the present invention is to provide a paint injection valve capable of drawing a line that is extremely thin and has a uniform width while continuously changing the color shade.

[0004]

This paint injection valve is installed inside a paint nozzle having a paint supply path inside, an annular air outlet surrounding the paint outlet, and the paint nozzle. And a valve body that opens and closes the paint outlet, and in which the paint supplied from the paint outlet is blown off by the air blown out from the air outlet to inject it, it projects from the center of the fuel outlet in the blowing direction. It is characterized in that a needle is provided.

[0005]

In the paint injection valve of the present invention, the paint adheres to the surface of the needle before jetting, and the jet airflow around the paint becomes a laminar flow with the needle as the core. For this reason, the paint blows out with a thin and uniform thickness. Also, by setting the area (length) of the needle according to the maximum amount, the paint can be sprayed uniformly even if the amount of paint to be supplied is changed. Can be drawn accurately. Moreover, since the coating material does not remain in the nozzle after use is stopped because it has a needle, there is no need to clean the interior of the nozzle when changing the coating material to be used.

[0006]

1 and 2 show a paint injection valve 100 according to an embodiment of the present invention. The injection valve 100 includes a body 1 fastened to the upper surface of a base B, a control rod 2 which is a valve body inserted through a horizontal through hole 11 provided in the center of the body 1, and a front portion of the body 1. Spray nozzle 3
And a control mechanism 4 fixed to the upper surface of the base B behind the body 1 for controlling the control rod 2. A paint can 200 is installed above the body 1.

The body 1 is made of aluminum, and the through hole 11 has a large-diameter paint nozzle chamber 12 in the front portion thereof, and further has a large-diameter air nozzle chamber 13 in the front portion thereof. Further, the rear portion of the through hole 11 is a joint chamber 14 having a large diameter and provided with a joint for the control rod 2, and a cap 15 for covering the joint chamber 14 is fastened to the outer periphery of the rear end portion of the body 1. ing. At the center of the body 1, the interior of the paint nozzle chamber 12 and the paint can 20
A paint flow passage 16 is formed to connect the air nozzle chamber 13 and the air flow passage 17, and an air flow passage 17 is formed to connect the inner portion of the air nozzle chamber 13 and an air pressure source (not shown).

The injection nozzle 3 is externally fitted and screwed to the front end of the body 1 and the paint nozzle 5 in which the rear end of the center of the nozzle chamber 12 is screwed to cover the air nozzle chamber 13. And an air nozzle 6. The paint nozzle 5 is an intermediate cylinder portion 5.
1, the rear end side screw portion 52, and the front end side nozzle portion 53, and the front end of the nodules portion 53 is the paint outlet 50. The air nozzle 6 is composed of a hollow nozzle portion 61 at the tip and a cap nut portion 62 at the rear end side, and is screwed to the front portion of the body 1 to form a front outer wall of the air nozzle chamber 13, and An annular air outlet 6 around the paint outlet 50
Forming 0. A cylindrical air guide 63 is attached to the tip of the nozzle portion 61, and an air suction hole 64 is formed in the rear portion thereof.

The control rod 2 comprises a front portion 2A and a rear portion 2B which are connected in the joint chamber 14 via a joint 20 formed of a spring which is a shock absorber. The front portion 2A is slidably supported in the through hole 11 of the body 1, and the rear portion 2B is connected to the control mechanism 4. The front portion 2A includes a cylindrical body portion 21, a taper portion 22 provided at the tip thereof, and a sharp taper portion 23 extending to the tip of the taper portion 22 and located at the paint outlet 50 of the paint nozzle 5.
It comprises a needle 7 projecting forward from the fuel nozzle 5. The taper portion 22 and the sharp taper portion 23 form a valve body that opens and closes the paint outlet 50 and adjusts the degree of opening.

The control mechanism 4 has a movable iron core 42 externally fitted at the rear end of the rear portion 2B of the control rod 2 in the housing 41, the outer periphery of which is wrapped with an electromagnetic coil 43, and a permanent magnet 44 is provided at the rear end. is set up. In addition, the housing 41
A shaft guide 45 is connected to the tip of the. The electromagnetic coil 43 is energized and controlled by the control device 300 shown in FIG. 4, and the opening of the paint outlet 50 of the paint nozzle 5 is adjusted to a predetermined value. The cap 15 and the shaft guide 45
The control rod 2 between and is provided with springs 26 and 27 for biasing the control rod 2 in the forward and backward directions to balance the control rod 2.

The paint is supplied from the paint can 200 to the annular flow path with the control rod 2 in the paint nozzle 5 through the paint flow path 16 and flows out from the paint outlet 50. Air is supplied to the air flow path 17 from an air source (not shown) through an air pipe,
It passes through an annular space 65 between the outer circumference of the paint nozzle 5 and the inner circumference of the air nozzle 6, and is ejected from an air outlet 60.

The control mechanism 4 controls the position of the control rod 2 according to the input and adjusts the opening degree of the paint outlet 50. When the control rod 2 is set to the most distal position, the paint outlet 50 is blocked by the taper portion 22 of the control rod 2, and the opening degree is adjusted by adjusting the position of the sharp taper portion 23 and the paint outlet 50. It changes with. That is, the control rod 21 is set to the rear position when drawing a dark line, and is set to the front position when drawing a thin line.

When air is blown out from the annular air outlet 60 at a predetermined blowing speed, the negative pressure generated at the paint outlet 50 causes the paint to flow out while adhering to the surface of the needle 7, and is blown away by the air flow. At this time, since the laminar flow is maintained for a long time with the needle 7 serving as a core in the air flow, the diffusion of the paint particles becomes a narrow range, and a thin line can be uniformly drawn on the coated surface.

Further, even if the amount of the supplied paint changes, the length of the paint attached to the surface of the needle 7 also changes, and the paint is evenly dispersed in the air flow. Therefore, the injection valve 100 can continuously draw a line in which the concentration changes abruptly when the control rod 2 is rapidly displaced and gradually changes when the control rod 2 is moved slowly. Further, since the needle 7 is used, the paint does not remain in the injection nozzle 3 after the paint is ejected, so that it is not necessary to wash the inside of the injection nozzle 3 when changing the paint to be used.

FIG. 3 shows a robot hand 8 provided with four paint injection valves 100 in series. Each paint injection valve 10 of the hand 8
No. 0 paint can 200 contains a reflective white paint that reflects light from the front, a translucent blue paint, a translucent yellow paint, and a translucent red paint.

FIG. 4 shows a spray-type full-color magnifying device 400 equipped with the hand 8. A reading device 401 for scanning an original image and a vertical / horizontal driving device 500 for the hand 8.
According to the scanning line of the reading device 401, the four paint injection valves 100 are controlled while moving the hand 8 by the vertical and horizontal drive device 500 to selectively blow paint of a predetermined color at a predetermined concentration. The control device 300.

The reading device 401 reads an original image such as a color photograph according to a scanning line by an optical sensor, converts it into an electric signal and outputs it. The vertical / horizontal drive device 500 includes a rectangular frame 510, an upper horizontal member 511 and a lower horizontal member 5 thereof.
It is reciprocally erected on 12 and has both vertical members 513, 514.
The movable vertical member 515 is reciprocally driven between the movable vertical member 515, a drive device for the movable vertical member 515, and a drive device for the hand 8 attached to the movable vertical member 515 so as to be vertically movable.

The control device 300 processes the input signal from the reading device 401 and moves the hand 8 in the lateral direction according to the scanning line while the four paint injection valves 10 are operated.
By controlling the control mechanism 4 of 0, each color is applied to the copy body at a predetermined darkness based on the data stored in advance in accordance with the input, and 3
Reproduce the original color by mixing the primary colors. When the application of one scanning line is completed, the movable vertical member 515 is returned, the hand 8 is moved up or down, and the coating material is applied according to the next scanning line. As a result, the original color image is enlarged at a predetermined enlargement ratio to render the subject in full color.

In the present invention, the needle 7 is not necessarily extended to the tip of the control rod 2, but may be attached to the tip of the paint nozzle 5 or the air nozzle 6.

[Brief description of drawings]

FIG. 1 is a sectional view of a paint injection valve according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a robot hand equipped with a paint injection valve according to the present invention.

FIG. 4 is an enlarged drawing device equipped with the robot hand of FIG.

[Explanation of symbols]

 1 Body 2 Control Rod (Valve) 3 Injection Nozzle 4 Control Mechanism 5 Paint Nozzle 6 Air Nozzle 7 Needle 50 Paint Outlet 60 Air Outlet 100 Paint Injector 200 Paint Can

Claims (1)

[Claims] 1. A paint nozzle having a paint supply path inside, an annular air outlet surrounding the paint outlet, and a valve body installed inside the paint nozzle for opening and closing the paint outlet. And a paint injection valve for spraying the paint supplied from the paint outlet with the air blown from the air outlet, wherein a needle protruding from the center of the fuel outlet in the blowing direction is provided. Paint injection valve.