JP2004058161A - Energy control mechanism of compressed air driven nailing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nailing machine with an energy adjusting mechanism adjusting an energy value generated by a hammering piston 12 by controlling the flow rate of compressed air introduced in a hammering cylinder 13. <P>SOLUTION: The hammering cylinder 13 slidably storing the hammering piston 12 is stored in a housing 10 forming a body of a nailing machine. An annular control plate 31 is disposed between the outer circumferential surface of the hammering cylinder 13 and the inner wall surface of the housing 10 so as to form a throttle passage 32 between the circumferential edge of the control plate 31 and the outer circumferential surface of the hammering cylinder 13 or the inner circumferential surface of the housing 10. The compressed air in an air chamber 21 is introduced in the hammering cylinder 13 via the throttle passage 32. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
SUMMARY OF THE INVENTION The present invention is directed to an energy control for a compressed air driven nailing machine in which a striking piston housed in a striking cylinder is driven by compressed air to strike a nail supplied into an injection port by a driver coupled to the striking piston. Regarding the mechanism.
[0002]
[Prior art]
In a nailing machine in which a piston is driven by using compressed air as a power source to drive a nail, a striking cylinder in which a striking piston is slidably housed in a hollow housing forming a body of the nailing machine. The main valve is disposed at the upper end of the impact cylinder, and compressed air is introduced into the impact cylinder via the main valve. An air chamber for storing compressed air from a compressed air supply source is formed inside the grip unit formed integrally with the housing, and the main valve selectively connects the air chamber and the exhaust port in the striking cylinder. I do. When the main valve connects the inside of the striking cylinder to the air chamber, compressed air is introduced into the striking cylinder and the striking piston is driven. A trigger valve for controlling the main valve is disposed at a base of the grip portion, and the trigger valve is operated by manually operating a trigger lever formed at a lower portion of the grip portion. It is configured.
[0003]
A nose part forming a nail injection port is attached below the body of the nailing machine, and a driver integrally attached to the lower surface of the hitting piston can slide into the nail injection port of the nose part. Has been guided to. A nail supply guide portion is integrally connected to an opening formed on a side surface of the nail ejection port of the nose portion, and a magazine for accommodating a plurality of interconnected nails is provided at a rear portion of the nail supply guide portion. The connected nails in the magazine are sequentially supplied into the nail outlet of the nose part by a nail supply mechanism connected and arranged along the nail supply guide part.
[0004]
In the above-mentioned nailing machine, various kinds of nailing machines are produced and used according to the shape and size of the nail to be used, the connection form of the nail, and the like. Particularly, a magazine and a nose portion are newly designed according to the shape of the nail to be used and the connection form of the nail. Further, the body of the nailing machine containing the driving mechanism such as the impact cylinder, the impact piston and the main valve mechanism is also designed such that the respective energy values are calculated according to the size and application of the nail used. In particular, since the body of the nailing machine has a high production cost, nails of different shapes and nails with different connection forms are used to share the body of the nailing machine that houses the drive mechanism in order to reduce production cost The production of a model to be performed is performed.
[0005]
[Problems to be solved by the invention]
Usually, the body of a nailer designed with an energy value close to the energy value according to the size of the nail used is shared, but if there is no body with an appropriate energy value, a body with a slightly larger energy value is replaced May be used in common. In this case, the energy is too large, the air consumption is also large, and there is much waste. Also, when the length of the nail is large, the height of the cylinder cap attached to the upper part of the body is increased to accommodate the cylinder corresponding to a long stroke, but the height of the cylinder cap is increased. The volume of the air chamber increases, and the energy increases with respect to the energy value set for the body, resulting in an increase in air consumption.
[0006]
Normally, a nail is driven into a material to be driven through a driver by energy given to a striking piston, and excess energy of the piston is absorbed by a body of the nailing machine through a bumper. In the case where the energy of the driving unit is considerably larger than the energy required for driving the nail used as in the above, the excess energy of the striking piston becomes large, and the bumper, the body or the nose of the nailing machine absorbs this excess energy. Damage or shorten their useful life.
[0007]
The present invention solves the above-mentioned problems in the prior art, and provides an energy control mechanism capable of adjusting an energy value generated by a striking piston by controlling a flow rate of compressed air introduced into a striking cylinder. An object of the present invention is to provide a compressed air-driven nailer provided with the same.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an energy control mechanism of a compressed air driven nailing machine according to the present invention includes a striking cylinder which slidably accommodates a striking piston in a hollow housing forming a body of the nailing machine. A striking piston is driven by introducing compressed air into the striking cylinder from an air chamber that is located and stores compressed air to fire a nail supplied into the nail outlet by a driver coupled to the striking piston. In a nailing machine configured to be driven from an outlet toward a material to be driven, an annular control plate is disposed between an outer peripheral surface of the impact cylinder and an inner peripheral surface of a housing forming a body of the nailing machine. A throttle passage is formed between the peripheral edge of the control plate and the outer peripheral surface of the impact cylinder or the inner peripheral surface of the housing, and compressed air in the air chamber passes through the throttle passage through the impact cylinder. Characterized in that so as to introduce.
[0009]
Further, in the invention according to claim 2, the control plate is formed integrally with an impact cylinder on an outer peripheral surface of the impact cylinder, and the throttle passage is formed between an outer peripheral edge of the control plate and an inner wall surface of the housing. It is characterized by having.
[0010]
Further, in the invention according to claim 3, the control plate is formed annularly separately from the striking cylinder, and the control plate is detachably disposed between an outer peripheral surface of the striking cylinder and an inner wall surface of the housing. It is characterized by having.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. FIG. 1 shows a nailing machine driven by compressed air having an energy control mechanism according to an embodiment of the present invention, and has a hollow shape forming a body of the nailing machine in which a grip portion 11 is integrally formed. A striking cylinder 13 which accommodates a striking piston 12 slidably in a housing 10 is arranged, and a driver 14 for striking a nail is integrally connected to a lower surface of the striking piston 12. A nose portion 16 forming a nail injection port 15 is attached to a lower portion of the housing 10, and the driver 14 is slidably guided into the nail injection port 15 of the nose section 16. A nail supply guide portion 17 is integrally connected to an opening formed on a side surface of the nail injection port 15 of the nose portion 16, and a number of connected nails are connected to a rear end of the nail supply guide portion 17. The magazines 18 to be housed are connected to each other, and the nails in the magazines 18 are sequentially supplied into the nail ejection port 15 of the nose section 16 by a nail supply mechanism 19 arranged along the nail supply guide section 17. I have.
[0012]
A main valve 20 is disposed at an upper end of the striking cylinder 13, and the main valve 20 selectively connects the inside of the striking cylinder 13 between an air chamber 21 formed inside the grip portion 11 and an exhaust port. . The air chamber 21 is connected to a compressed air supply source via an air plug 22 attached to the rear end of the grip portion 11. When the main valve 20 connects the inside of the striking cylinder 13 to the air chamber 21, the compressed air in the air chamber 21 is introduced into the striking cylinder 13 to drive the striking piston 12. A trigger valve 23 for controlling the main valve 20 is disposed at a base of the grip portion 11. The trigger valve 23 is activated by manually operating a trigger lever 24 formed at a lower portion of the grip portion 11. Have been to be.
[0013]
The main valve 20 is formed in an annular shape, and the lower end surface of the main valve 20 abuts on a seal member 25 formed on the outer peripheral surface of the striking cylinder 13 to form an air chamber 21 formed in the grip portion 11. The striking cylinder 13 is shut off. Further, an upper end surface of the main valve 20 is housed in an annular valve chamber 26 formed in a cylinder cap 10a mounted above the housing 10. When the main valve 20 is not operated, the main valve 20 is compressed by the compressed air pressure in the valve chamber 26. Is pressed downward to maintain the state between the striking cylinder 13 and the air chamber 21 in a shut-off state. The valve chamber 26 is in communication with the trigger valve 23, and the compressed air in the valve chamber 26 is controlled by the trigger valve 23.
[0014]
A bumper 27 for absorbing the excess energy of the striking piston 12 is disposed below the striking cylinder 13 of the nailing machine housing 10. The driver 14 drives the nail in the nail ejection port 15 of the nose portion 16. The striking piston 12 that has been driven into the material is received by the nose portion 16 via the bumper 27 at the bottom dead center position. An annular return chamber 28 is formed between the lower outer peripheral surface of the impact cylinder 13 and the inner wall of the housing 10, and one of compressed air that drives the impact piston 12 through an opening 29 formed in the impact cylinder 13. After the driving portion is introduced into the return chamber 28 and the driving step is completed, the compressed air in the return chamber 28 acts on the lower surface side of the impact piston 12 to return the impact piston 12 to the top dead center position of the impact cylinder 13. Let it.
[0015]
Between the inner wall surface of the housing 10 forming the body of the nailing machine and the outer peripheral surface of the striking cylinder 13, compressed air for driving the striking piston 12 is guided from the air chamber 21 into the striking cylinder 13. A supply path 30 is formed, and a control plate 31 for limiting the opening area of the air supply path 30 is disposed between the impact cylinder 13 and the inner peripheral surface of the housing 10. As shown in FIGS. 2 and 3, the control plate 31 is formed integrally with the striking cylinder 13 in a flange shape from the outer peripheral surface of the striking cylinder 13, and is formed between the outer peripheral edge of the striking cylinder 31 and the inner wall surface of the housing 10. A throttle passage 32 having a limited opening cross-sectional area is formed therebetween. The opening area of the throttle passage 32 is such that the energy generated in the striking piston 12 by the compressed air introduced into the striking cylinder 13 through the throttle passage 32 drives the nail into the material to be driven by the striking piston 12. It is set to be appropriate for.
[0016]
In addition, on the outer peripheral surface of the impact cylinder 13, an annular flange portion 33 for supporting a seal member 25 for forming a seal between the impact cylinder 13 and the air chamber 21 between the lower end surface of the main valve 20, An annular flange portion 34 for partitioning the air chamber 21 and the return chamber 28, and compressed air introduced into the return chamber 28 from within the impact cylinder 13 through the opening 29 is used to reduce the pressure of the impact piston 12 in the impact cylinder 13. An annular groove 36 for mounting a check valve 35 for preventing return to the upper surface side is formed.
[0017]
As shown in FIG. 1, before the nailing machine is started, compressed air is supplied via a trigger valve 23 into a valve chamber 26 in which the upper end of the main valve 20 is housed. Numeral 20 is pushed downward by compressed air in the valve chamber 26 acting from the upper end, and the lower end surface of the main valve 20 is in close contact with a seal member 25 formed on the outer peripheral surface of the impact cylinder 13 so that the inside of the impact cylinder 13 And the air chamber 21 are shut off. The striking piston 12 is held at the top dead center of the striking cylinder 13.
[0018]
When the trigger valve 23 is operated by operating the trigger lever 24 to start the nailing machine, as shown in FIG. 4, the compressed air in the valve chamber 26 in which the upper end of the main valve 20 is housed is released. Emitted to the atmosphere through Since the main valve 20 is no longer pressed by the compressed air from the upper end face, the main valve 20 is operated upward by the compressed air in the air chamber 21 acting on the seal face at the lower end of the main valve 20, and the lower end face is sealed by the sealing member. 25, the striking cylinder 13 is communicated with the air chamber 21. The compressed air in the air chamber 21 is supplied into the striking cylinder 13 via the air supply path 30.
[0019]
A throttle passage 32 is formed in the air supply passage 30 between the outer peripheral edge of the control plate 31 and the inner wall surface of the housing 10. The opening area of the throttle passage 32 is covered with a nail by a driver 14 coupled to the striking piston 12. Since the opening area is set to be suitable for driving the driving material, the flow rate of the compressed air flowing into the striking cylinder 13 is limited, and the energy generated by the striking piston 12 by the compressed air is restricted. Therefore, the driving energy of the nail by the driver 14 driven by the striking piston 12 is controlled to an appropriate state.
[0020]
In the above embodiment, the control plate 31 is integrally formed on the outer peripheral surface of the hitting cylinder 13, and the hitting cylinder 13 integrally formed with the control plate 31 is placed in the housing 10 forming the body of the nailing machine. Although the specific energy value can be set for each impact cylinder 13 by housing, the control plate 31 is formed in an annular shape separately from the impact cylinder 13 as shown in FIGS. The control plate 31 is detachably attached to the cylinder 13 by screwing a female screw 31a formed on the inner peripheral edge of the annular control plate 31 with a male screw 13b formed on the outer peripheral surface of a flange portion 13a formed on the outer periphery of the impact cylinder 13. The throttle passage 32 may be formed between the inner wall surface of the housing 10. By configuring the control plate 31 separately from the hitting cylinder 13 in this manner, a plurality of control plates 31 having different external dimensions are selected and mounted, thereby enabling a nailing machine using the same nailing machine body and cylinder. It can be set to any energy value. When the control plate 31 is formed separately from the cylinder 13 as described above, the outer peripheral side of the control plate 31 is attached to the housing 10, and between the inner peripheral edge of the control plate 31 and the outer peripheral surface of the impact cylinder 13. The throttle passage 32 may be formed.
[0021]
【The invention's effect】
As described above, according to the energy control mechanism of the present invention, without using a complicated mechanism, using the body of a nailing machine designed to a predetermined energy value, the compressed air flowing into the striking cylinder is used. By controlling the flow rate, it is possible to adjust the energy of the striking piston driven in the striking cylinder, and it is possible to share the body of one nailing machine with various kinds of nailing machines. Cost can be reduced. Further, in the nailing machine produced by implementing the energy control mechanism of the present invention by sharing the body of the nailing machine, the striking piston can be driven with energy suitable for driving the nail to be used. It is possible to prevent the nailing machine from being damaged by energy, to prolong the service life of the nailing machine, and to reduce the air consumption.
[Brief description of the drawings]
1 is a longitudinal sectional side view of a nailing machine in which an energy control mechanism of the present invention is implemented; FIG. 2 is a cross-sectional view of a striking cylinder of the nailing machine of FIG. 1; FIG. FIG. 4 is a longitudinal sectional side view showing a main part of the nailing machine of FIG. 1 in a state in which the nailing machine is driven. FIG. 5 is a perspective view, partly in section, showing another embodiment of the energy control mechanism of the present invention. FIG. 6 is a longitudinal sectional side view of the same energy control mechanism as in FIG.
REFERENCE SIGNS LIST 10 housing 12 impact piston 13 impact cylinder 14 driver 20 main valve 21 air chamber 25 seal member 26 valve chamber 30 air supply path 31 control plate 32 throttle passage 33 annular flange 34 annular flange 35 check valve 36 annular groove

Claims (3)

A striking cylinder accommodating a striking piston is slidably housed in a hollow housing forming a body of the nailing machine, and compressed air is introduced into the striking cylinder from an air chamber storing compressed air. In the nailing machine, a driving piston is driven to drive the nail supplied into the nail injection port by a driver connected to the hitting piston toward the material to be driven from the injection port. An annular control plate is arranged between the outer peripheral surface and the inner peripheral surface of the housing forming the body of the nailing machine, and between the peripheral edge of the control plate and the outer peripheral surface of the impact cylinder or the inner peripheral surface of the housing. An energy control mechanism for a compressed air-driven nailing machine, wherein a throttle passage is formed, and compressed air in an air chamber is introduced into a striking cylinder through the throttle passage. 2. The control plate is formed integrally with an impact cylinder on an outer peripheral surface of the impact cylinder, and the throttle passage is formed between an outer peripheral edge of the control plate and an inner wall surface of the housing. The energy control mechanism of the compressed air driven nailing machine according to the above. The control plate is formed annularly separately from the impact cylinder, and the control plate is detachably disposed between an outer peripheral surface of the impact cylinder and an inner wall surface of the housing. The energy control mechanism of the compressed air driven nailing machine according to the above.

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