JPH0230041Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a piece gun for spraying that can smoothly discharge coating fluid for writing instruments.

[Background technology]

In recent years, so-called felt-tip pens, etc., are made by spraying colored coating liquid such as water-based or oil-based ink into the body of the pen with high-pressure air onto the writing part, which is the tip.
It is known that the coating liquid is atomized and used for drawing, for example, illustrations, but in the conventional one, as shown schematically in FIG.
The air outlet C that fits into the protrusion provided on the side and discharges high-pressure air is connected to the writing area A1 at the tip of the air outlet C.
were formed apart on the sides. Therefore, in addition to being inconvenient to hold, since the blown air is discharged from the side, the coating liquid sometimes tends to flow back into the body E from the writing section A1, and the coating liquid always flows from one side of the writing section A1. Since air enters the writing part A1, the locations where the writing part A1 can be used are limited, causing damage to the writing part A1 more quickly, and the flow of the coating liquid to the writing part A1 tends to be uneven, making it difficult to achieve constant and smooth atomization and spraying. Ta.

Therefore, by forming an air flow path surrounding the tip of a pen-shaped writing instrument, the inventors of the present invention allow air to flow along the entire circumference of the writing section, thereby reducing the negative impact caused by the air flow. While sucking out the coating liquid inside the writing instrument using pressure,
We have devised a piece gun for spraying that solves part of the above problems by making it possible to atomize and spray.

However, since this type of liquid is sucked out mainly by the negative pressure caused by the flow of air, when a material that is relatively difficult to ooze out is used as a writing instrument, especially as a coating liquid, the amount of liquid to be sucked out is insufficient. There were times when I did.

On the other hand, writing implements are usually provided with a pressure balancing hole in order to balance the pressure between the outside air and the inside, and the present invention utilizes the pressure balancing hole.
Improved the shortcomings of the conventional spray gun,
It reminded me of a piece gun for spraying that can smoothly discharge coating liquid.

[Purpose of invention]

This invention has an air flow path for atomizing the coating liquid.
The object of the present invention is to provide a piece gun for spraying which can solve the above-mentioned problems by communicating with a pressure balancing hole provided in a writing instrument to increase internal pressure and enable smooth spraying of coating liquid.

[Disclosure of invention]

An embodiment of the present invention will be described below based on the drawings.

In the figure, a spray gun 1 is provided with an air passage 7 for projecting air toward the tip of the writing instrument 4 on a base 5 on which a pen-shaped writing instrument is attached. The air passage 7 is connected to a high-pressure air source P via an on-off valve 6 while being electrically connected to the provided pressure balancing hole 8 .

The writing instrument 4 has a writing part 3 protruding from the tip of the body 2. In this example, the body 2 has a straight cylindrical part 21 with an open rear end, and a tapered cone part 22 formed at the tip of the straight cylindrical part 21.
In addition, an impregnating material 24 such as felt that impregnates the coating liquid is filled and installed inside, and a plug piece 2 is provided at the rear end.
5 for sealing. Further, in the cone portion 22, a tip metal fitting 29 in which a tip 26 having a continuous hole is provided in a metal tube 27 is provided, which allows the tip 26 to protrude from the metal tube 27 and connects the tip portion of the metal tube 27 to the cone portion 22.
The writing part 3 is formed by the protruding part of the tip fitting 29 from the cone part 22 by fixing them together so as to extend outward from the tip.

Note that the tip 26 comes into contact with the impregnating material 24 and causes the coating liquid to ooze out onto the writing portion 3 thereof. Furthermore, it is also possible to use a writing instrument 4 that does not use the metal tube 27 but only has a tip 26, or one that consists only of the metal tube 27.
In addition, the writing part 3 refers to a part of the body 2 that protrudes from the body 2.
A small diameter section for writing that is smaller than the

A step 30 for attaching a cap that fits into the writing instrument 4 is formed in the straight cylinder part 21, and a forward facing step part 31 is also formed at the boundary between the straight cylinder part 21 and the cone part 22. The cone portion 22 is provided with the pressure balancing hole 8, which communicates with the inside of the body portion 2, at a substantially intermediate position.

In this example, the base body 5 is a pen-shaped container that stores the writing instrument 4 therein, and the base body 5 is a cylindrical body 41 that fits the straight cylindrical part 21 with an air gap g1.
, a nozzle metal fitting 42 that covers the tip thereof, and a cap-shaped pushing tool 43 that shields the rear end.

The nozzle fitting 42 has a threaded portion 46 screwed onto the inner end of a flange 45 that fits the end surface of the cylinder 41.
is provided, and a tapered nose 47 is provided protruding from the front surface thereof.

The nozzle fitting 42 also has an inner hole 4 into which the cone portion 22 of the writing instrument 4 can be inserted with an air gap g2.
9 is provided. A pressure balancing hole 8 provided in the cone portion 22 opens into the air gap g2. Further, at the tip of the inner hole 49, the air outlet 9 consisting of a small hole is provided.
At the same time, a narrow parallel portion is provided on the inside near the outlet 9.

Note that a receiving metal fitting 51 is attached to the parallel portion. As shown in FIG. 3, the receiving fitting 51 has a cone-shaped body 54 having an outer diameter that fits into the parallel portion and has both end surfaces inclined obliquely in parallel at an angle of about 45 degrees. A tapered hole 55 is bored along the cone portion 22. In addition, a step 56 is provided on the front surface, and three notches 57 for air conduction are formed on the outer periphery of the step by cutting off a flat surface starting from the lower edge of the step. Attaches by press-fitting.

The pushing tool 43 has a flange 61 having the same diameter as the cylindrical body 41, and a threaded portion 62 that is screwed into the cylindrical body 41. Seal 63 is installed. Further, the threaded portion 62 is formed with a stepped hole 64 for receiving the rear end of the writing instrument 4.

The writing instrument 4 is inserted between the end surface of the threaded part 46 of the nozzle fitting 42 and the stepped part 31 with a spring means 10 made of, for example, a coil spring interposed therebetween, and the rear end is inserted into the stepped hole 64 of the pushing tool 43. support,
It is stored and attached inside the base body 5. As described above, the writing instrument 4 has its cone portion 22 supported by the tapered hole 55 of the receiving metal fitting 51, and its rear end is fitted into the stepped hole 64 of the pushing tool 43, so that it is concentric with the cylinder body 41. At the same time, air gaps g1 and g2 exist between the cylindrical body 41 and the nozzle fitting 42, and in this example, the writing instrument 4 is surrounded over its entire length, including the tip part, and a pressure equalization hole 8 is formed. The air flow path 7 communicating with the air flow path 7 is formed.

Further, the spring means 10 urges the writing instrument 4 backward in the longitudinal direction, and the end surface of the threaded portion 46 of the nozzle fitting 42 supports the writing instrument 4 via the spring means 10 and urges the writing instrument 4 in the longitudinal direction. A supporting portion 12 for urging is formed. Further, the pushing tool 43 pushes the writing tool 4 against the spring means 10 due to its screw engagement.
can be moved forward in the longitudinal direction and backward by screwing back.

Therefore, the writing instrument 4 moves in the longitudinal direction by screwing forward and backward of the pushing tool 43, and the position of the writing part 3 can be adjusted inside the outlet 9, and if necessary, it can be made to protrude slightly from the outlet 9. The relative position between the writing part 3 and the writing part 3 is varied.

The on-off valve 6 is attached to the cylindrical body 41.

The on-off valve 6 is provided with bearing pieces 72, 72 extending from both sides at the tip of a prismatic base cylinder 71, and the operation piece 15 is pivotally supported between the bearing pieces 72, 72. The operation piece 15 has a lever shape in this example, and the upper piece 73
A pivot piece 74 that is inserted into the bearing piece 72 and pivotally supported as described above is provided on the lower surface, and a pusher piece 75 is provided in an expanded manner on the lower surface. Furthermore, the upper piece 73
includes a projecting piece 76 that is hooked onto the upper surface of the base tube 71 in its horizontal state.

The base cylinder 71 has an air nipple 9 at its rear end.
A stepped hole consisting of a large diameter part 91 into which 0 is fitted and a small diameter part 92 into which the actuating piece 16 is inserted is bored, and inside the small diameter part 92 is a side hole 9 extending into the inside of the cylinder 41.
4 is installed transparently in the center.

The actuation piece 16, as shown in detail in FIG.
It has a tapered part 95 at the tip and a flange 9 at the rear end.
6 is provided around the flange 96, and the flange 96
A circumferential groove 99 is formed in contact with which a seal 97 such as an O-ring is attached, and two circumferential grooves 101 and 102 are provided in front of the circumferential groove 99 with a gap in between. Further, a guide hole 103 is provided at the center, extending below the circumferential groove 102 and having a sealed rear end. Furthermore, side holes 104 and 105 communicating with the guide hole 103 are bored in the bottom surfaces of the circumferential grooves 101 and 102.

In the actuating piece 16, a spring 106, one end of which is supported by the air nipple 90, presses the flange 96, so that the seal 97 moves between the large diameter portion 91 and the small diameter portion 92.
Close the valve seat formed by the step in between. In this state, the circumferential groove 102 is located at a different position from the side hole 94, and an exhaust hole 109 that can be aligned with the circumferential groove 102 and communicates with the outside air is provided in the base 71. Further, the tip of the actuating piece 16 protrudes from the base cylinder 71,
It comes into contact with the pusher piece 75 of the operation piece 15 .

By pushing down the upper piece 73 of the operating piece 15 with a finger operation, the pushing piece 75 moves the operating piece 16 backward, causing the circumferential groove 101 to protrude into the large diameter portion 91.
Therefore, the large diameter portion 91 passes through the circumferential groove 101 and the side hole 104, passes through the guide hole 103, and communicates from the side hole 105 and the circumferential groove 102 to the side hole 94, forming an air passage 17 communicating with the air flow passage 7. do.

In addition, at the initial stage of operation of the operation piece 15 when the circumferential groove 101 is slightly exposed to the large diameter portion 91, the circumferential groove 102 communicates with the exhaust hole 109 and the side hole 94 at the same time. Surge air pressure, which is an impact pressure, is discharged from the exhaust hole 109. Note that by further pressing down the operation piece 15, the circumferential groove 10
2 is removed from the exhaust hole 109, and is brought into conduction to the side hole 94 as described above.

The air nipple 90 is connected via a hose or the like to a high-pressure air source P such as an air compressor that can take out high-pressure air or a high-pressure can that stores high-pressure air. Further, by pushing down the operating piece 15 with a finger, the air passage 17 is opened and the high pressure air is introduced into the air passage 7. Note that the surge air pressure at the initial stage of operation can be exhausted to the outside air through the exhaust hole 109, as described above. The high-pressure air in the air flow path 7 flows along the inner hole 49 of the nozzle fitting 42 and blows high-speed air while diagonally crossing the writing part 3, and then flows out from the air outlet 9. .

High-speed negative pressure air is blown over the entire circumference of the writing instrument 3, and the coating liquid is sucked and atomized by the negative pressure.

Further, the high-pressure air flowing into the writing instrument 4 from the pressure balancing hole 8 pressurizes the impregnating material 24 and the coating liquid inside. Therefore, the high-speed air flow along the writing part 3 helps the suction force due to the negative pressure acting on the writing part 3, and the coating liquid flows out smoothly during use.

Further, by screwing the pushing tool 13 back and forth, the relative position between the writing instrument 3 and the outlet 9 can be adjusted, and the amount of the coating liquid discharged, the spraying condition, etc. can be adjusted.

[Effect of idea]

As mentioned above, the spray gun of this invention is
An air flow path is formed around the tip of the writing instrument in the handheld base on which the writing instrument is attached. Therefore, high-speed air can be blown from almost the entire periphery of the writing section of the writing instrument, and the coating liquid can be sprayed onto the writing section of the writing instrument. Allows for smooth discharge from all circumferential surfaces. In addition, the inside of the writing instrument is pressurized through the pressure equalization hole, which works in conjunction with the negative pressure generated by the high-speed air flow around the writing part, allowing the coating liquid to be discharged efficiently and smoothly. Enables spraying.

As schematically shown in FIG. 5, the spraying piece gun 1 of the present invention has a base 5 into which only the tip of the writing instrument 4 is inserted as a shaft seal, as long as the air flow path 7 communicating with the pressure balancing hole 8 can be formed. may also be used, and the sixth
It can also be used for the type shown in the figure that discharges air from the side, and can be modified into various configurations such as using a push button type as the operation piece 15.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an exploded perspective view, FIG. 3 is a perspective view illustrating the receiving metal fitting, FIG. 4 is a perspective view illustrating the actuating piece, and FIG.
The figure is a perspective view showing another embodiment, and FIG. 6 is a front view illustrating a conventional spray gun. 2...Body part, 3...Writing part, 4...Writing instrument, 5
... Base body, 6 ... Opening/closing valve, 7 ... Air flow path, 8 ...
...Pressure balance hole, 9...Blowout port.

Claims (1)

[Scope of utility model registration request] A hand-held base on which a pen-shaped writing instrument is attached, which has a small-diameter writing part protruding from the tip of the body containing a coating liquid from which the coating liquid oozes out, and has an equilibrium hole opened in the body for communication with the outside air. and a piece gun for spraying, which has an air outlet at its tip that discharges air toward the writing section, and forms an air flow path that communicates with the pressure equalization hole and is connected to a high-pressure air source via an on-off valve. .