JP2778480B2 - Sound reduction device for pneumatic driven nailing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reducing the operating noise associated with nail driving by a pneumatically driven nail driver.

[0002]

2. Description of the Related Art In recent years, noise regulations have been strict in various aspects, and there has been a strong demand for reducing the operating noise of a nailing machine even in a nailing operation.

[0003] The operating noise generated when operating a pneumatic driven nailing machine mainly includes a hitting noise generated when a striking piston collides with a bumper at the bottom of a striking cylinder, and compressed air is exhausted after the nailing operation. There is an exhaust sound generated when the sound is generated, and the exhaust sound is louder than the blow sound. By the way, in order to reduce the exhaust noise, it is preferable to release the exhaust gas from the exhaust port while gradually reducing the pressure, instead of releasing the exhaust gas to the atmosphere at once. For that purpose, a new decompression chamber must be created.

[0004] However, a large space is required to form such a decompression chamber, which is a factor that hinders the operability of the nailing machine. It is also conceivable to use a high-density and space-saving filter, but this has the disadvantage that the exhaust is used as a brake and the repeated hit cycle is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and in particular, to provide a noise reduction device for a pneumatic driven nailing machine capable of reducing exhaust noise without providing a space for noise reduction. That is its purpose.

[0006]

In order to achieve the above object, a sound reducing apparatus for a pneumatic nailer according to the present invention comprises a connecting nail formed by connecting a number of U-shaped staples. In the pneumatic driven nailing machine provided with a staple guide for guiding the staple guide, the inside of the staple guide is formed hollow, and an exhaust passage for guiding the exhaust after the nailing operation of the nailing machine is formed inside the staple guide. And a large number of exhaust holes are formed through all or a part of the peripheral wall of the staple guide.

[0007]

According to the above construction, the exhaust gas generated after the nailing operation of the nailing machine is discharged from the exhaust port, then introduced into the internal space of the staple guide through the exhaust passage, diffused, and further exhausted. Released through holes.

As described above, since the exhaust gas is not directly discharged to the atmosphere but discharged through the inside of the staple guide, the pressure of the exhaust gas is reduced during that time, and the sound is attenuated.

[0009]

FIG. 1 shows a pneumatic driven nailing machine, which comprises a nailing machine body 1 and a magazine 2 and a compressed air supply source P.
The staple supplied from the magazine 2 into the nose portion 6 is struck and driven by driving the striking piston 5 in the striking cylinder 3 with the air taken in from the cylinder. The exhaust after the nail driving operation is exhausted from the exhaust port 7. An exhaust passage 8 is connected to the exhaust port 7.

The connecting nail 9 is, as shown in FIGS.
It is a long connection of staples formed in a U shape,
It is guided by a staple guide 4 in the magazine 2.

The magazine 2 has a staple guide 4 which is connected to the nose portion 6 at a right angle to the nose portion 6 and is formed in a rectangular cylindrical box shape and the inside is hollow. The staple guide 4 slidably guides the inner side surface of the connecting staple 9 to the upper wall 4a and the side wall 4b, and the connecting nail 9 is constantly biased toward the nose portion 6 by a staple pusher (not shown).

The rear end wall 4c of the staple guide 4 is open at the end 8a of the exhaust passage 8 of the nailer body. A large number of exhaust holes 10 are formed through the peripheral wall of the staple guide 4.

Further, it is preferable to dispose a filter 11 on the inner wall of the staple guide 4. Filter 11
It is sufficient to use a material with high sound absorption damping effect such as felt or foam material, and the filter is not arranged in layers as shown in the figure, but a staple guide made of fibrous sound absorbing material such as felt or glass wool material 4 may be filled.

The end of the exhaust passage may be opened not at the end wall of the staple guide 4 but at the bottom wall 4d. Further, the exhaust hole 10 does not necessarily need to be formed on the entire peripheral wall. For example, it may be configured to be formed only on both side walls 4b.

According to the above construction, the exhaust gas generated after the nailing operation of the nailing machine is discharged from the exhaust port 7 and then introduced into the internal space of the staple guide 4 through the exhaust passage 8 and diffused. It is released from the exhaust hole 10. As described above, since the exhaust gas is not directly discharged to the atmosphere but is discharged through the inside of the staple guide 4, the pressure of the exhaust gas is reduced during that time, and the sound is attenuated.

A part of the exhaust sound is generated by the staple guide 4.
The sound is absorbed by the filter 11 disposed on the inner wall of the staple guide 4 and the exhaust is
The sound is reduced more efficiently because of the resistance at the time of being discharged from the exhaust hole 10.

Further, the sound reduction is performed by using the staple guide 4, and a relatively large internal space can be secured inside the staple guide 4. Therefore, not only can effective sound reduction be realized,
Since the exhaust resistance is small, there is almost no influence on the continuous cycle performance.

In the internal space of the staple guide 4, an appropriate member for diffusing exhaust gas more efficiently may be arranged.

[0019]

According to the present invention, since the exhaust gas generated by the nail driving operation is diffused inside the staple guide, the sound is reduced. Since the internal space of the staple guide is relatively large, effective sound reduction can be realized.

Further, since the internal space of the staple guide is large, the exhaust resistance is small, and there is almost no effect on the continuous hitting cycle performance.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a pneumatically driven nail driver according to the present invention.

FIG. 2 is an enlarged rear sectional view of a main part of the sound reduction device according to the present invention.

FIG. 3 is a cross-sectional view taken along line XX of FIG. 2;

[Explanation of symbols]

 4 Staple Guide 6 Nose 9 Connecting Nail 10 Exhaust Hole 11 Filter

Claims (1)

(57) [Claims] 1. A pneumatically driven nailing machine provided with a staple guide for guiding a connecting nail formed by connecting a number of U-shaped staples to a nose portion of the nailing machine, wherein the inside of the staple guide is formed hollow. In addition, an exhaust passage for guiding the exhaust after the nailing operation of the nailing machine is connected to the inside of the staple guide, and a large number of exhaust holes are formed through all or a part of the peripheral wall of the staple guide. Sound reduction device of a pneumatic nailer.