JPH09141570A - Exhaust mechanism in pneumatic nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide exhaust mechanism in a pneumatic nailing machine, generating no dust with quiet exhaust sound. SOLUTION: This nailing machine is provided with a body 1 with built-in impact mechanism (a), a grip 8 connected to a compressed air supply source, and a magazine 19 for supplying nails to a nail ejecting nose part 5 provided at the tip of the body 1, and so constituted that the impact mechanism (a) is driven by compressed air, supplied from the compressed air supply source, to drive out a nail in the nose part 5. In this case, an exhaust chamber 26 is provided between the grip 8 and the magazine 19, and exhaust air exhausted at the time of driving the impact mechanism (a) is exhausted into the atmosphere from the exhaust chamber 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nailing machine for driving a nail striking mechanism by air pressure, and exhaust air after driving the striking mechanism is exhausted to the rear of the nailing machine. Regarding the mechanism.

[0002]

2. Description of the Related Art Generally, a pneumatic nailing machine drives a nail striking mechanism by compressed air to drive a nail, but after driving the nail, the compressed air is discharged from the striking mechanism to the atmosphere. In the conventional striking mechanism, a striking piston equipped with a nail driving driver is slidably housed vertically in a striking cylinder.
Compressed air is supplied into the striking cylinder to drive the striking piston, and after nailing, the compressed air in the striking cylinder is exhausted from an exhaust cover provided above the cylinder cap of the striking cylinder. The exhaust direction can be freely changed by rotating the exhaust cover.

[0003]

However, the exhaust pressure is considerably high, and regardless of the exhaust direction, the ceiling material and wall material related to nail driving are located around the cylinder cap. Therefore, it is a problem that dust is blown up every time the exhaust air is exhausted.

Further, every time high-pressure exhaust air is discharged into the atmosphere, a large and unpleasant exhaust noise is generated.

It is an object of the present invention to solve the above problems and to provide an exhaust mechanism for a pneumatic nailing machine that does not generate dust and produces a quiet exhaust noise.

[0006]

In order to solve the above problems, the exhaust mechanism in the pneumatic nailing machine according to the present invention is
A body including a striking mechanism, a grip connected to a compressed air supply source, and a magazine for supplying nails to a nail injection nose portion at the tip of the body are provided, and the compressed air supplied from the compressed air supply source In a pneumatic nailing machine that drives a striking mechanism to strike a nail in the nose part, an exhaust chamber is provided between the grip and the magazine, and exhaust gas discharged when the striking mechanism is driven is discharged to the atmosphere from the exhaust chamber. It is characterized by doing so.

The pneumatic nailing machine may be a driving machine having a striking mechanism for a driving screw and a screw rotating mechanism for a screw driven by an air motor.

In this case, the air motor is arranged above the magazine, and the exhaust passage from the striking mechanism is connected to the exhaust chamber via a chamber arranged at the rear of the air motor and a throttle portion following the chamber. It is preferably configured to be connected.

Exhaust gas from the air motor may be discharged from the exhaust chamber via an exhaust passage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a driving machine for driving a driving screw, in which a hammering piston 4 equipped with a hammering bit 3 is moved up and down in a hammering cylinder 2 inside a body 1. Slidably housed in the striking cylinder 2
A striking mechanism a of a driving screw for striking a driving screw 6 in a nose portion 5 provided at the tip of the body 1 by a bit 3 by supplying compressed air into the driving piston 4 and the striking cylinder. 2 is provided with a screw rotation mechanism b for screwing the driving screw 6 hit by the driving of the striking piston 4 by the air motor 7 driven by a part of the compressed air supplied to 2.

The compressed air is supplied from the compressed air supply source into the striking cylinder 2 through the grip 8 and the air chamber 27 formed in the body 1.

The striking mechanism a is operated by pulling the trigger lever 9. As shown in FIG. 2, the trigger valve 10 is operated by the trigger lever 9, and the head valve 12 is opened and operated in conjunction with the trigger valve 10.
The high pressure compressed air in the air chamber 27 is used for striking the cylinder 2
To drive the striking piston 4 instantaneously.
As a result, the driving screw 6 driven by the striking mechanism a is driven into the driven material 13 with a part left, and is further screwed by the screw rotating mechanism b.

On the other hand, when the trigger lever 9 is released, as shown in FIG. 1, the trigger valve 10 causes the head valve 12 to close the striking cylinder 2 in the air chamber 27 and open it in the exhaust outlet 14. The pressure on the upper surface of the striking piston 4 decreases, and the pressure on the lower surface rises due to the action of the compressed air that is compressed by the striking piston 4 and is stored in the blowback chamber 15 at the time of driving. Since it is reversed, the striking piston 4 returns to the top dead center.

The screw rotating mechanism b is the output shaft 1 of the air motor 7.
The rotation of No. 6 is transmitted to the drive gear 18 via the intermediate gear 17, and the bit 3 inserted into the non-circular through hole at the center of the drive gear 18 is rotated. The bit 3 is slidable in the axial direction with respect to the drive gear 18, and is inserted so as to rotate together with the drive gear 18. The air motor 7 is arranged above the magazine 19. Further, a part of the compressed air supplied to the striking cylinder 2 is configured to be supplied to the air motor 7 via an air passage (not shown).

The driving screw 6 is connected through a connecting member and is housed in the magazine 19 in a coil shape. Then, they are supplied one by one into the nose portion 5 by the screw feed cylinder device 20.

By the way, when the striking piston 4 is returned to the top dead center by releasing the trigger lever 9, the compressed air supplied into the striking cylinder 2 is the exhaust outlet 14 formed at the center of the head valve 12. Is exhausted to the atmosphere through a long exhaust path. Similarly, compressed air for operating the air motor 7 of the screw rotation mechanism b is also discharged to the atmosphere.

The exhaust passage is provided in the cylinder cap 21 of the striking cylinder 2 and is connected to the exhaust outlet 14 and is connected to the first exhaust passage 14.
Chamber 22, an exhaust passage 23 formed downward from the first chamber 22 along the body 1 and further rearward along the screw rotation mechanism b, and a second exhaust passage 23 continuing from the exhaust passage 23.
The chamber 24 and the exhaust chamber 26 connected to the second chamber 24 via the throttle portion 25. The second chamber 24 is arranged behind the air motor 7 and above the magazine 19, and the exhaust chamber 26 is formed between the grip 8 and the magazine 19. An exhaust port 28 is formed in the rear wall of the exhaust chamber 26. A filter is preferably attached to at least one of the first chamber 22, the second chamber 24, and the exhaust chamber 26. The compressed air for operating the air motor 7 is configured to be sent to the second chamber 24 via an exhaust passage (not shown) of a system different from the exhaust passage 23.

With the above exhaust passage structure, the striking cylinder 2
As shown in FIG. 1, the exhaust gas from the exhaust gas outlet 14
Through the first chamber 22, the exhaust passage 23, the second chamber, the throttle portion 25, and the exhaust chamber 26 to the atmosphere. By the way, the high-pressure compressed air from the striking cylinder 2 expands when being introduced into the first chamber 22 from the exhaust outlet 14, contracts in the exhaust passage 23, and passes over a relatively long time, When it is introduced into the second chamber 24, it re-expands, is contracted again by the throttle portion 25, and finally expands again by the exhaust chamber 26 and is exhausted from the exhaust port 28. In this way, the exhaust expands,
While repeatedly contracting, the exhaust pressure sharply decreases while passing through a long exhaust path, and the flow velocity also sharply decreases. Therefore, it is possible to prevent dust and dirt from being blown up by the exhaust pressure, and
Exhaust noise is reduced to make it quieter and improve work efficiency.
Further, the exhaust air is exhausted rearward from a portion between the grip 8 and the magazine 19, but this exhaust direction has no inconvenience in work. Of course, the exhaust direction may be variable.

Since the compressed air for operating the air motor 7 is also discharged after being sent to the second chamber 24 through the exhaust passage of a system different from the exhaust passage 23, the exhaust from the air motor 7 is also reduced. It is sounded and exhausted.

The exhaust path is not limited to the above example. The number of chambers through which the exhaust gas passes may be increased, and the exhaust path may be arranged along the grip 8.

Further, the exhaust mechanism described above is not limited to the driving machine. It can also be applied to an exhaust mechanism of a striking mechanism of a normal pneumatic nailer.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a driving machine equipped with an exhaust mechanism according to the present invention.

FIG. 2 is an explanatory view of an operation mode of a striking mechanism of the driving machine.

[Explanation of symbols]

 1 Body 5 Nose 7 Air Motor 8 Grip 19 Magazine 23 Air Motor 25 Throttle 26 Exhaust Chamber

Claims (4)

[Claims] 1. A body provided with a striking mechanism, a grip connected to a compressed air supply source, and a magazine for supplying a nail to a nail injection nose portion at the tip of the body, and the magazine is supplied from the compressed air supply source. In the pneumatic nailing machine that drives the striking mechanism by compressed air to strike the nail in the nose part, an exhaust chamber is provided between the grip and the magazine,
An exhaust mechanism in a pneumatic nailing machine, wherein exhaust gas discharged when the striking mechanism is driven is discharged from the exhaust chamber to the atmosphere. 2. The exhaust mechanism for a pneumatic nailing machine according to claim 1, wherein the pneumatic nailing machine is a driving machine having a hammering mechanism for a driving screw and a screw rotating mechanism for a driving screw driven by an air motor. . 3. The air motor is arranged above the magazine, and an exhaust passage from the striking mechanism is connected to the exhaust chamber via a chamber arranged at a rear portion of the air motor and a throttle portion continuing from the chamber. The exhaust mechanism in the pneumatic nailer according to claim 2. 4. The exhaust mechanism for a pneumatic nailing machine according to claim 2, wherein exhaust air from the air motor is exhausted from the exhaust chamber through an exhaust passage.