JPS5930136B2 - painting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating device that is lightweight and easy to handle by controlling the injection of paint and air from a spray gun using a signal generator.

Even today, when painting industrial products such as electrical appliances, which have a wide variety of types and shapes, painting workers directly use a spray gun that is connected to a paint supply device and a compressed air supply device via a hose. 2. Description of the Related Art It is widely practiced to sequentially and continuously paint objects to be coated while being gripped and conveyed.

However, conventional manual spray guns are configured so that the paint nozzle valve and air valve, both of which are biased by a spring, are operated directly with the finger using a trigger, which requires considerable finger force and makes continuous operation difficult. In addition, the valve mechanism has become more complex and heavier, which can cause occupational diseases such as key sheath inflammation and key shoulder inflammation, and there has been a demand for shorter work hours from the standpoint of safety and health. .

The object of the present invention is to provide a coating apparatus that can solve the above-mentioned problems by controlling the supply of paint and air using a signal generator, and one embodiment thereof will be described below with reference to the drawings.

The apparatus 1 of the present invention includes a spray gun 2, a paint supply device 4 such as a paint pressure tank, a compressed air supply device 6 such as a compressor, and a space between the spray gun 2, the paint supply device 4, and the compressed air supply device 6. The spray gun 2 is provided with a control device 8 which is connected to the spray gun 2 via a paint hose 510 and an air hose 52.

The spray gun 2 is provided with a pressure displacement means such as a diaphragm valve 23 at the rear end of a needle valve 22 that moves freely toward and away from the inner surface of the paint nozzle 21 at the tip, and the needle valve 2 is normally displaced.
2 is brought into contact with the inner surface of the paint nozzle 21, and the paint nozzle 21 is moved back due to the pressure of the paint to be pumped, and the paint nozzle 21 is opened. After operating the means,
It flows around the needle valve and is ejected from the paint nozzle 21.

Note that the air cap 5 opened at the tip of the paint nozzle 21 is the air nipple 2 juxtaposed to the paint nipple 24.
6 to an air hose 52. A signal generator 3 is removably installed inside the gun grip 2T, and a switch S (
By protruding the push button a in front of the grip part 27 in FIG. . As illustrated in FIG. 1c, the signal generator 3 includes a switch S1, a one-shot multivibrator 31,
A crystal oscillation circuit 32, a power amplification circuit 33, and an oscillation antenna 34 are connected to each other, and the one-shot multivibrator 31 is operated by the trigger of the switch S.
is modulated and a radio wave having the waveform shown at the beginning of FIG. 1d is transmitted from the transmitting antenna 34.

The control device 8 controls the air hose 5 as shown in the lower part of FIG. 1c.
an air on-off valve SOL1 that opens and closes the air flow path leading to the paint flow path; and a paint on-off valve SOL2 that opens and closes the paint flow path;
In this embodiment, the air on-off valve SOL1 is a two-way valve, and the paint on-off valve SOL2 is a three-way valve. In the control circuit, 91 is a receiving antenna, 92 is a high frequency amplifier circuit, 93 is an intermediate frequency amplifier, 94 is a detection circuit, 95 is a differentiation circuit, 96 is a binary counter, 97a is a delay circuit a, 97p is a delay circuit p,
98a is a flip-flop a198p is a flip-flop p. X1 is a relay a for operating the air on-off valve, and X2 is a relay p for operating the paint on-off valve.The signal received by the receiving antenna 91 (b in Figure 1 d) is amplified by a so-called superheterodyne method. and each circuit 94, 95
By detecting, differentiating, and shaping the waveform, the first pulse P1 shown in FIG. 1d-2 is generated at two points in the circuit.

The pulse P1 is counted by the binary counter 96, and its first count output sets the flip-flop a98a, and the relay aX1 opens the air on-off valve SOL1 to blow out air from the air cap 25. The first count output passes through a delay circuit p97p, is delayed for a predetermined time t1 (to d in FIG. 1), and is output to the flip-flop p97p.
By setting 98p and opening paint on-off valve SOL2 by relay pX2, air on-off valve SOL1 is opened prior to paint on-off valve SOL2.

As a result, the paint is forced into the spray gun 2, and the paint is transferred to the needle valve 22 by the diaphragm valve 23 due to the hydraulic pressure.
is retracted and atomized and sprayed at the paint nozzle 21. By pressing the switch of the signal generator 3 again, a second pulse P2 is given to the binary counter 96, and the counting output first resets the flip-flop p98p, closes the paint opening/closing valve SOL2, and also closes the delay circuit a97a. Then, after a delay of time t2, the air on-off valve SOL1 is closed. Note 2
The advance counter 96 is then cleared as appropriate. The spray gun 2 of this embodiment, in which the needle valve 22 is directly opened and closed by the pressure displacement means, is different from the conventional spray gun in which an air hose 53 for controlling the needle valve is separately provided, for example, as shown in FIG. While reducing the number of piping hoses,
Since the gun 2 and the control circuit 9 are connected wirelessly and the opening and closing of paint and air can be controlled by pressing button a of the switch S, the operation of the gun can be made easy.

The gun 2 is controlled by a three-way valve, and the residual pressure generated when the gun paint nozzle is closed is removed as the gun is switched. FIG. 2 shows another example of the control circuit 9 and the signal generator 3. In this example, the signal generator 3 has a push button a consisting of a residual contact type lock switch Sa attached to the grip part 27 of the spray gun 2.
And it is connected to the control circuit 9 with a relatively long cord. The control circuit of this example is as shown in Fig. 2b.
By turning on a, relay A Af) a contact A-1
closes and operates relay B B's a contact B-3 to open air on-off valve SOL1, and at the same time starts timer T1 and after the set time, timed operation contact t1 operates to open paint on-off valve SOL2. By this, (timer T2 is relay A
Af) (not activated by b contact A-3), the air on-off valve SOL1 that injects air is opened prior to the paint on-off valve SOL2 that ejects paint.

By pushing out the lock switch Sa again and opening it, first, the a contact A-2 is turned OFF and the paint on/off valve SOL2 is turned off.
is closed, B contact A-3 returns, and timer T2
is started, and after a predetermined period of time, the timed operation contact t2 is opened to open relay B, thereby turning off the a contact B-3 and closing the air opening/closing valve SOL1.

By connecting the gun 2 and the control circuit 9 by wire via a cord in this way, it is possible to prevent signal interference and increase its reliability, and by keeping the voltage between the switch Sa low, arcing is prevented and safety is achieved. ensure sex.

FIG. 3 shows another embodiment of the invention.

A piston 28 is attached to the rear end of the paint needle valve 22 of the spray gun 2a.
The needle valve 22, which connects and separates from the paint nozzle 21, is opened and closed using the needle valve control air introduced in front of the piston 28. Therefore, the spray gun 2a has an air hose 52 for spraying. It is equipped with an air hose 53 for controlling the needle valve and a paint hose 51 directly connected to the paint supply device 4, and the signal generator 3 is removably attached to the grip part 27, and has a small diameter protruding length. A push button al of the blowing air switch S1 and a push button A2 of the switch S2 for needle valve control, that is, paint control, are respectively attached, and the two push buttons A
l and a2 are sequentially pressed by the trigger 29. Figure 3b
In the signal generator 3 of this example shown in , S1 is a switch for blowing air, and S2 is a switch for controlling paint, which are respectively installed in parallel with a one-shot multipipulator 31, and the vibrator 31 is connected to a crystal oscillation circuit 32 and a power amplification circuit. It is connected to the circuit 33 and the transmitting antenna 34, respectively. In addition, Fig. 3b
In the control device 9 shown below, 91 is a receiving antenna, 92 is a high frequency amplification circuit, 93 is an intermediate frequency amplification circuit, 9
4 is a detection circuit, 95 is a differential circuit, 96a is a quaternary counter, and 98a is a flip-flop A. Xl is relay a, 98p is flip-flop p for paint control,
X2 is a relay p, and by pulling the trigger 29, the signal generator 3 first turns on the blowing air switch S1 and then turns on the paint control switch S2 appropriately, and sends the signal from the transmitting antenna to the port shown in FIG. 3c. A signal having a waveform shown in is transmitted, and the control circuit 9 amplifies, detects, and differentiates the signal to generate two translational pulses Pl and P2 at two points, which are counted by a quaternary counter 96a.

The quaternary counter 96a sets the flip-flop A98al relay AX1 with the first count output, and the air on/off valve SOL is set.
1 is opened, flip-flop P98p is set by the second counting output, relay PX2 opens the needle valve controlled on-off valve, that is, paint on-off valve SOL2', the piston 28 is moved back, and the paint is ejected, and the paint is ejected before the paint on-off valve SOL2' is opened. Open the air on/off valve SOLl.

By releasing the trigger, translational pulses P3 and P4 are generated again and counted by the quaternary counter 96a, and the third and fourth counting outputs are first sent to the flip-flop P98p for paint control.
Next, the flip-flops A98a for blowing air are respectively set and the blowing is stopped. As mentioned above, in the painting device of the present invention, the control circuit is operated by a push button that can be operated by the hand holding the spray gun, so the trigger operation is easier than in the conventional device in which the paint needle valve or the like is directly pointed. It is lightweight, increases work efficiency, brings good results in terms of safety and health, and also reduces the weight associated with the conventional complicated valve mechanism of spray guns, making it lighter and allowing it to be used for longer periods of time. . Note that when the signal generator 3 uses the needle valve shown in Fig. 1b to stop the injection of paint by effectively utilizing the paint pressure with a valve such as a diaphragm, the signal generator 3 replaces the conventional needle valve shown in Fig. 3a. Compared to the case where a separate hose for operation is provided, the weight acting on the gun can be reduced and the operability can be further improved.

In addition, by attaching the signal generator to the spray gun in a detachable manner, it is possible to easily clean the gun, operate the air and paint separately over time, and prevent the occurrence of spitting, etc. By using a fluid element, incorporating a fluid control switch into the signal generator and connecting it to the control circuit, it is possible to eliminate electrical contacts and improve safety.

[Brief explanation of the drawing]

FIG. 1a is a schematic diagram showing an embodiment of the system of the device of the present invention;
FIG. 1b is a partial cross-sectional side view illustrating the spray gun used in this embodiment, FIG. 1c is a block diagram illustrating the signal generator and control device circuit, and FIG. 1d is an illustration of FIG. A schematic waveform diagram showing the signal at the point ~ by comparing the symbols, Figure 2a
2b is a circuit diagram illustrating the circuit thereof; FIG. 3a is a schematic diagram of another embodiment of the device according to the invention, in particular showing a spray gun. FIG. 3b is a block diagram illustrating the circuit of the signal generator and control circuit, and FIG. 3c is a schematic diagram showing the signals at points A to A in FIG. 3b with contrasting symbols. FIG. 2... Spray gun, 3... Signal generator, 4... Paint supply device, 6... Compressed air supply device, 8...・Control device, 9...
・Control circuit, SOLl...Air on/off valve, SOL
2, SOL2''...Paint on/off valve, 51...
...Air hose, 52...Paint hose, A, a
l, a2...Push button.

Claims (1)

[Scope of Claims] 1. A spray gun, a paint supply device, a compressed air supply device, and a paint on-off valve that is connected to the spray gun through a hose and controls the supply of paint from the paint supply device to the spray gun. and an air on-off valve for controlling the supply of air from the compressed air supply device to the spray gun, and a control device provided with a control circuit capable of opening the air on-off valve prior to the paint on-off valve, and the spray gun A coating device further comprising a signal generator having a push button capable of operating the control circuit and operable by a hand holding the spray gun. 2. The coating apparatus according to claim 1, wherein the signal generator is wirelessly connected to a control circuit.