JPH0890997A - Vibrating pen with noise absorbing mechanism - Google Patents

Abstract

PURPOSE: To realize the reduction of noise in a high frequency sound range generating from blow-off holes by a method wherein blow-off passages of air beyond the blow-off holes of a vibrating pen are provided in a sound absorbing wall. CONSTITUTION: In a pressurizing chamber 22 partitioned in the case 6 of a vibrating pen, pressurized air is introduced from air source and then blown off through blow-off holes 23 in blow-off passages in a sound absorbing wall 3. In this case, though noise is generated when the air is emitted from the blow-off hole 23, the noise is converted into heat in the blow-off passages and then absorbed. Since the acoustic-to-thermal conversion efficiency by the sound absorbing wall 3 becomes higher at a high frequency sound range, the inner diameter (d) of the blow-off hole 23 is made smaller. Thus, the noise in a high frequency sound range is generated so as to realize higher sound arresting effect. Further, by making the inner diameter D of discharge holes 31 larger (than (d)) in the blow-off passages, the speed of the air emitted is lowered, resulting in suppressing the generation of noise at the release to the air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating pen with a noise absorbing mechanism. The vibration pen is used for engraving lot numbers, product names, etc. on the surface of a workpiece.

[0002]

2. Description of the Related Art Next, the structure of a conventional vibration pen will be described with reference to FIG. 2 is a pen shaft, 6 is a case,
Reference numeral 7 is a contact member such as an O-ring, 8 is a compression spring, 9 is a thin plate-shaped elastic member, and 12 is a holder.

In FIG. 2, the case 6 and the holder 12 are screwed to each other so as to facilitate the replacement of parts. Holder 12
A working chamber 21 is formed in the holder 12, and the air source 11 serves as a working chamber 21 in the holder 12 through a flow passage 11A formed in the case 6.
Contact. An annular groove 6 is formed on the upper inner wall surface 6A of the case 6.
B is formed, and the adhesion member 7 is attached to the groove 6B.

The shaft portion 1A of the pen shaft 1 is reciprocally held by a holder 12. The compression spring 8 is held by the pen shaft 1 in a direction to push up the pen shaft 1. The elastic member 9 is attached to the head 1B of the pen shaft 1. The pressurizing chamber 22 is formed by the inner wall surface 6A, the contact member 7 and the thin plate elastic member 9.

Next, the operation of FIG. 2 will be described with reference to FIGS. 3 is an enlarged view of an essential part of FIG. 2. In FIG. 3, the contact member 7 is pushed by the elastic member 9, but the inner wall surface 6A h
Is protruding by the height of. The elastic member 9 is pushed by the compression spring 8 and bends by δ at the contact end of the contact member 7. Figure 3
Is a state before pressurized air is supplied to the pressure chamber 22 which is a closed space, and the relationship of h> δ is maintained.

When pressurized air is supplied to the flow path 11A from the state of FIG. 3, the pressure in the pressure chamber 22 increases, a downward force acts on the elastic member 9, and the pen shaft 1 descends. . The downward force acts on the elastic member 9 so that the elastic member 9 has a δ
The deflection is restored. When the pressure in the pressurizing chamber 22 further rises and the pen shaft 1 descends, the sealed state of the pressurizing chamber 22 by the contact member 7 and the elastic member 9 cannot be maintained, and the state shown in FIG. 4 is obtained.

In FIG. 4, the pressurizing chamber 22 becomes an open space,
The air in the pressurizing chamber 22 is opened to the atmosphere through the air outlet 24. When opened to the atmosphere in FIG. 4, the pen shaft 1 is pushed by the compression spring 8 and returns to the state of FIG. When the pressurized air is continuously supplied in FIG. 3, the states of FIGS. 3 and 4 are repeated, so that the pen shaft 1 continues to vibrate.

As shown in FIG. 2, the tip of the shaft portion 1A of the pen shaft 1 is formed in a pyramidal shape, and the tip is processed with a workpiece 10 such as metal.
When pressed against the surface of the workpiece, the surface of the workpiece 10 is plastically deformed by the impact force when the conical tip hits the workpiece 10,
Can be marked. 2 to 4 are technically the same as FIGS. 1 to 3 described in the specification of Japanese Patent Application No. 5-34236.

[0009]

Next, the principle of noise generation in a vibrating pen utilizing pneumatic pressure, as represented by the vibration generating mechanism of FIG. 2, will be described with reference to FIG. FIG. 5 is FIG.
FIG. 7 is a state diagram of the air flow near the outlet 24 when the vibrating pen is vibrating, showing the state of noise generation when the air in the working chamber 21 is opened to the atmosphere through the outlet 24. In FIG. 5, 24 is an outlet, 24A is an outlet flow, 24B is a vortex, 25 is a high frequency range, and 26 is a low frequency range.

As shown in FIG. 5, when the gas is blown out at a high speed from the blowout port 24, the stationary gas and the blowout flow 24A are used.
A vortex 24B is generated due to the turbulence of the flow caused by the collision with the vortex 24B, which causes sound to be generated. In this case, since the flow velocity is high in the vicinity of the outlet 24 downstream of the outlet 24, a small vortex is formed. In addition, a large vortex is generated because the flow velocity becomes slow in the part far from the outlet 24. The small vortex region is the high frequency range 25, and the large vortex region is the low frequency range 26. It is said that the downstream is up to about 20 times the inner diameter d of the outlet 24 as the sound source.

In the vibrating pen of FIG. 2, the air in the working chamber 21 is opened to the atmosphere through the air outlet 24, so that an operator near the vibrating pen is inevitably exposed to the noise generated at this time. To be done.

According to the present invention, the air blowing path ahead of the air outlet of the vibrating pen is prepared in the vibrating pen, and the air blowing path is provided in the sound absorbing material to reduce the noise in the high frequency range generated from the air outlet. The purpose is to provide a vibrating pen.

[0013]

In order to achieve this object, the present invention relates to a vibrating pen in which when a compressive fluid is supplied, the pen shaft 1 vibrates to stamp the surface of a workpiece 10.
A holder 2 that holds a pen shaft 1 and has a working chamber 21 in which a compressive fluid that vibrates the pen shaft 1 is released and that forms a plurality of outlets 23 for discharging the compressive fluid in the working chamber 21 on a side wall 2A. And surrounding the side wall 2A of the holder 2 to form a discharge port 31 which is connected to the outlet port 23 in the circumferential direction, and to form a discharge hole 32 which is connected to the discharge port 31 and discharges the compressive fluid in the axial direction. The sound absorbing wall 3 is provided, and the inner diameter d of the outlet 23 of the holder 2 is made sufficiently smaller than the inner diameter D of the outlet 31 of the sound absorbing wall 3.

The vibrating pen according to the present invention further includes a cover 4 that wraps the sound absorbing wall 3 in the circumferential direction. Further, the vibrating pen according to the present invention is arranged in the vicinity of the outlet 23 and on the side opposite to the discharge hole 32, and the side wall 2A of the holder 2 and the sound absorbing wall 3 are arranged.
The adhesion member 5 is attached between the inner walls of the.

[0015]

According to the above-mentioned structure, since the inner diameter of the air outlet formed in the holder is sufficiently smaller than the inner diameter of the air outlet path provided in the sound absorbing wall, noise in the high frequency range generated from the air outlet is generated. Is absorbed by the sound absorbing wall, and the blowout flow is decelerated in the blowout path set to a sufficient width, thereby significantly reducing the noise level generated during its vibration.

Further, the vibrating pen has a three-layer structure in the working chamber, the noise is absorbed by the sound absorbing wall surrounding the case, and the sound absorbing wall is surrounded by the cover, so that the sound absorbing effect of the sound absorbing wall due to the scattering of oil droplets is achieved. Prevent reduction. Further, the contact member attached between the side wall of the holder and the inner wall of the sound absorbing wall prevents air leakage from the blowout port to the outside of the sound absorbing wall.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of a vibrating pen according to the present invention is shown in FIG.
Example will be described. 1A is a plan view and FIG.
B is a sectional view of FIG. 1, 2 is a holder, 3 is a sound absorbing wall, 4 is a cover, 5 is a contact member such as an O-ring, and the others are the same as those in FIG. That is, the configuration of FIG. 1 is obtained by adding the sound absorbing wall 3, the cover 4 and the contact member 5 to the vibrating pen of FIG.

In FIG. 1, the case 6 and the holder 2 are screwed together to facilitate replacement of parts. The holder 2 holds the pen shaft 1 and has a working chamber 21 in which a compressive fluid that vibrates the pen shaft 1 is released. The sound absorbing wall 3 surrounds the side wall 2A of the holder 2 and forms a discharge port 31 that is connected to the air outlet 23 in the circumferential direction, and has a discharge hole 32 that is connected to the discharge port 31 and discharges the compressive fluid in the axial direction. Form. That is, the sound absorbing wall 3 is provided with a plurality of discharge holes having the discharge ports 31 and the discharge holes 32 as discharge paths, and all of the blow discharge holes are connected to the discharge port 23. Furthermore, the space between the sound absorbing wall 3 and the holder 2 is designed to be sealed by the contact member 5. The sound absorbing wall 3 is covered with a cover 4.

In FIG. 1, the air discharged from the pressurizing chamber 22 passes through the blow-out port 23, becomes a blow-out flow, and flows into the discharge port 31. Noise in the high frequency range and the low frequency range is generated by the vortex generated when the high-speed blowout flow exiting the air outlet 23 collides with the stationary gas. Here, by making the inner diameter of the air outlet 23 sufficiently small, Noise in the high frequency range is intentionally generated.

A discharge port 31 and a discharge hole 32 together with the blowout flow
The noise that has entered the exhaust path of is converted into heat by the function of the sound absorbing material here, but since the efficiency of heat exchange by the sound absorbing material is higher in the high frequency range, the efficiency of the high frequency range that is intentionally generated is Noise will be efficiently absorbed here.

Since the inner diameter of the outlet 31 is sufficiently wider than the inner diameter of the outlet 23, the high-speed blowout flow from the outlet 23 is sufficiently decelerated in the blowout path in the sound absorbing wall 3 and blows out. Open to the atmosphere from the end of the path. As a result, the generation of noise due to the air discharged from the end of the discharge hole 32 is eliminated.

[0022]

According to the present invention, the air blowing path ahead of the air outlet of the vibrating pen is prepared in the vibrating pen, and the air blowing path is provided in the sound absorbing material, so that the noise in the high frequency range generated from the air outlet is suppressed. It is possible to provide a reduced and inexpensive vibration pen.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vibrating pen according to the present invention.

FIG. 2 is a configuration diagram of a vibrating pen according to a conventional technique.

FIG. 3 is a state change diagram of FIG.

FIG. 4 is a state change diagram of FIG.

FIG. 5 is a principle diagram of noise generation during operation of the vibrating pen according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pen shaft 2 Holder 2A Side wall 3 Sound absorbing wall 4 Cover 5 Adhesive member 21 Working chamber 23 Air outlet 31 Discharge port 32 Discharge hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F15B 15/14 380 Z 9026-3J

Claims (3)

[Claims] 1. A vibrating pen for engraving a surface of a workpiece (10) by vibrating the pen shaft (1) when a compressive fluid is supplied, the pen shaft (1) being held and the pen shaft (1) ) Has a working chamber (21) through which a compressive fluid is released, and the side wall (2A) has a working chamber (2
1) Enclose the holder (2) that forms multiple outlets (23) for discharging the compressible fluid in 1) and the side wall (2A) of the holder (2), and connect with the outlet (23) in the circumferential direction. Of the holder (2) is provided with a sound absorbing wall (3) that forms a discharge port (31) that connects to the discharge port (31) and forms a discharge hole (32) that discharges the compressive fluid in the axial direction. The inner diameter d of the air outlet (23) is the outlet of the sound absorbing wall (3)
A vibrating pen with a noise absorbing mechanism, which is sufficiently smaller than the inner diameter D of (31). 2. A cover (4) surrounding the sound absorbing wall (3) in the circumferential direction.
The vibrating pen with a noise absorbing mechanism according to claim 1, further comprising: 3. A contact member (a) is arranged near the outlet (23) and on the opposite side of the discharge hole (32) and between the side wall (2A) of the holder (2) and the inner wall of the sound absorbing wall (3). 5. The vibrating pen with a noise absorbing mechanism according to claim 1, wherein the vibrating pen is attached.