JPS603470Y2 - spray gun switch device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch device for a spray gun that can reduce the weight of the spray gun and ensure safe handling.

Spray guns for painting, etc. should be light and easy to handle, and in order to prevent the equipment from being handled carelessly and to ensure the safety of the equipment and operation, avoid using it by anyone other than the person who is supposed to be operating it. is often requested.

On the other hand, with hand-held spray guns for painting that are used continuously for long periods of time, particularly for body painting or touch-up painting of assembly-line products, the paint nozzle valve and air valve, which are conventionally biased by a spring, are pulled by hand. Since it is constructed so that it can be operated through a wire, it requires power, and the valve mechanism becomes congested and heavy, so long-term use is not desirable from the standpoint of safety and health.

As a result, an external control valve was installed in place of the valve mechanism,
A hand-held device has been devised in which only the switch that operates the control valve is mounted, but since such spray guns are used in an organic solvent atmosphere, it is necessary to prevent arcing at the switch. be.

The present invention aims to provide a switch device for a spray gun that can meet the above requirements, and one embodiment thereof will be described below with reference to the drawings.

In the figure, a reed switch 5 is installed in a notch 4 recessed in the handle 3 of the spray gun 2 in close proximity to the front edge of the handle 3, and the reed switch 5 is attached to the operator's right glove. The reed switch 5 is operated by a magnet piece 7 glued to the center of the index finger of the reed switch 5, and the front surface of the reed switch 5 is shielded with a non-magnetic cover 8 such as an aluminum plate.

The spray gun 2 has a diaphragm 11 at the rear end of a needle valve 10 that can freely move toward and away from the inner surface of a paint nozzle 9a at the tip, a pressure displacement device (hereinafter referred to as a diaphragm 11) that can be displaced by receiving pressure from a piston or the like.

), the needle valve 10 is normally brought into contact with the inner surface of the paint nozzle 9a, and the diaphragm 11 is moved back by the pressure of the paint fed from the paint nipple 12 at the lower end of the handle part 3 to open the paint nozzle 9a. The paint nozzle 9a is externally provided with an air cap 9b communicating with an air nipple 13 juxtaposed to the paint nipple 12.

The paint nipple 12 is connected to a regulator 15 for preventing spitting by a paint hose A14, and the air nipple 1
The air hose a16 connected to the control device 17 is connected to a terminal a1B for blowing air of the control device 17.

The control device 17 has regulator pressurizing terminals b21., which connect the air hoses b19 and c20 connected to the regulator 15, respectively. It has a terminal c22 for opening and closing the regulator 15, and a terminal d24 for connecting an air hose d2B that introduces air from the air compressor A, and is further provided with an electric terminal 25 for leading out a signal line.

As shown in FIGS. 3 and 4, the control device 17 controls the power supply voltage to
In addition to stepping down the voltage to OV and rectifying it, the transistor (
The electric terminal 25 is interposed in the connection line to the base of the Tr), and the weak signal current can be amplified to drive the relay (R), and a meter 26 is provided at the a contact of the relay (R). The coils of three-way electromagnetic valves 28, 29, 30 are connected to the terminals a''c18, 21, 22 through the pressure valve 27 so as to be able to cut off the compressed air from the air hose d23.

Therefore, the air compressor A is connected to the spray 72 via the air hose a16, the three-way solenoid valve 28, and the air hose d23, and can be shut off by the three-way solenoid valve 28 of the control device 17.

The connecting wire 31 to the electric terminal 25 is connected to the reed switch 5 by sealing the joint 32, passing through the air hose 16, and taking it out through the joint 33 near the spray gun 2.
Therefore, the connecting wire 31 can be prevented from being damaged by dragging or the like.

The regulator 15 has a pressurizing chamber 35 and a suction chamber 36, which are partitioned by a diaphragm 34. The pressurizing chamber 35 is connected to the air hose b19, the suction chamber 36 is connected to the paint hose a14, and the diaphragm 34 is urged toward the pressurizing chamber 35 by the spring a37, and the suction chamber 36 is forced by the needle valve a.
A paint hose b40 communicates with a paint chamber 42 which communicates with a paint pressure feeding tank 41 through an on-off valve 39 using a paint hose b40.

Therefore, the paint compression tank 41 is connected to the spray gun 2 via the paint hose a14, the suction chamber 36, the paint chamber 42, and the paint hose b40, and the on-off valve 39 is opened and closed by the control device 17 as described above. Can be cut off or conductive.

A piston 43 is provided at the base of the needle valve a38 and a spring b44 is provided at its rear end to keep the on-off valve 39 closed at all times, and the air hose c20 is connected to the air chamber 45 in front of the piston 43.
to communicate.

A cleaning thinner pressure feeding tank 47 is connected to the paint hose b40 by a switching valve 46, and compressed air is introduced into the paint pressure feeding tank 41 and the cleaning thinner pressure feeding tank 47, which is branched into an air hose d23.

However, after putting on the right glove 6 and gripping the spray gun 2, he brought the magnet piece 7 of his index finger close and turned on the reed switch 5.
By doing this, the relay (R) is turned on and each three-way solenoid valve 2
8, 29, and 30 are operated to conduct the compressed air whose pressure has been regulated by the pressure regulating valve 27 to each terminal a=c18, 21, and 22.

Air is supplied to the spray gun 2 through the air hose a14 and is ejected from the air cap 9b, at the same time.
The air introduced into the pressurizing chamber 35 of the regulator 15 through the air hose b19 deforms the diaphragm 34 to reduce the volume of the suction chamber 36, and the air entering the air chamber 45 through the air hose C20 causes the needle valve a38 to be closed. The on-off valve 39 is opened, and the paint from the paint pressure feeding tank 41 is passed through the paint hose b40, the paint chamber 42 of the regulator 15, the on-off valve 39, the suction chamber 36, and the paint hose a14 to the paint nozzle 9a of the spray gun 2.
Exposed gushing from.

By extending your index finger and separating the magnet piece 7 from the reed switch 5, the relay (R) and each three-way solenoid valve 28.
29. 30 to 0FFL paint, stop blowing out air.

In addition, when the on-off valve 39 of the regulator 15 is shut off, the diaphragm 34 also returns, and the volume of the suction chamber 36 increases to its original state, thereby preventing spitting by sucking the paint.
The switching valve 46 can also be cleaned with switching thinner.

As mentioned above, the spray gun switch device of this invention is
Since the reed switch is operated by a magnetic piece attached to the operator's finger, use by those who do not have the magnetic piece is restricted, and it also prevents careless handling of the device and improves the safety of other operations. To provide a spray gun that can be easily handled by reducing the weight and simplifying the structure by significantly reducing the need for fingers for switch operation.

Furthermore, by using a reed switch sealed in a glass tube, the risk of explosion due to sparks can be reduced even in an organic solvent atmosphere.

In addition, it can be turned on and off via a relay using a reed switch.
If necessary, the reed switch can also be used for direct switching, and the magnetic piece can also be attached in the form of a ring, or it can also be attached to other fingers such as the little finger as the power is reduced. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing one embodiment of the present invention, FIG. 2 is a sectional view of the spray gun, and FIGS. 3 and 4 are circuit diagrams of the pushing device. 2... Spray gun, 5... Reed switch, 7... Magnet piece, 9a... Paint nozzle, 11... Diaphragm, 17・・・・・・
...Control device, 41...Paint pressure feeding tank, A.
·····air compressor.

Claims (1)

[Scope of utility model registration request] A pressure displacement device that is displaceable by the pressure of paint flowing from the paint pressure tank to open and close a paint nozzle of the spray gun, in which a paint pressure feed tank and an air compressor are connectably connected using a control device. The reed switch is equipped with a reed switch that is turned on and off by a magnet piece attached to the operator's finger, and the reed switch is connected to the control device, and the control device is operated by the output thereof. Spray gun switch device.