JPH0523915B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a nailing method that absorbs the impact during nail driving and keeps the nail driving depth constant when driving nails into gypsum boards, steel plates, etc. Regarding machines.

(Prior art) In a nailer of the type that drives a piston in a cylinder with compressed fluid and drives a nail with a driver provided integrally with the piston, high-pressure compressed fluid suddenly flows into the upper part of the cylinder. The pressure is used to drive the piston in the cylinder downwards, striking the nail loaded in the injection part.
The nail is driven into the material by being ejected into it. However, the pressure of the high-pressure fluid that has flowed into the cylinder acts on the top surface of the piston to drive it downward, and at the same time acts on the top bottom surface of the cylinder that faces the top surface of the piston, so the reaction force of the fluid pressure causes the cylinder to move downward. When lifted upward, the cylinder housing springs up and the tip of the injection part separates from the surface of the material to be driven, making it difficult to drive accurately. In order to prevent such springing up, there is a method of pressing the upper part of the cylinder housing by hand, but the driving depth of the nail changes depending on the magnitude of the pressing force. In this way, with conventional nailers, the driving depth differs depending on whether or not the cylinder housing is pressed, and when it is pressed, depending on the magnitude of the pressing force. When driving nails into the surface of wood, the head of the nail may protrude too far from the surface of the gypsum board, or it may tear the paper on the surface of the gypsum board and sink into it. If the nail head sticks out, it will get in the way when you put the cloth on the plasterboard, and if it sinks in again, the plasterboard will lose its shape retention, which is a problem. Therefore, it is always desirable to drive the nails to an accurate and uniform depth, as is particularly the case with plasterboard.

In addition, as a mechanism for absorbing the recoil of the striking piston, a recoil absorbing member is provided in the cylinder so as to be slidable so as to face the striking piston, and a mechanism for absorbing the recoil in the cylinder between the piston and the recoil absorbing member is provided. A mechanism is known in which both members are driven in opposite directions by the expansion force of the fluid, thereby preventing propagation of the impactive reaction force of the tool body (for example, Japanese Patent Publication No. 43-356). (see official bulletin). In the case of this technology, the weight of the recoil absorbing member must be sufficiently large compared to the weight of the striking piston, which increases the weight of the tool, and it is also necessary to create a space within the housing in which the recoil absorbing member can move. Therefore, there is a problem that the tool itself has to be made larger. Moreover, pneumatic nailers introduce compressed air into the cylinder and use this pressure to drive the piston. Since the head valve for evacuation is located at the top of the cylinder, the conventional recoil absorption mechanism described above cannot be used.

(Technical Problem of the Invention) The present invention was developed in view of the above circumstances, and is capable of driving nails accurately and uniformly without significantly increasing the weight or size of conventionally known compressed air type nailers. The object of the present invention is to provide a compressed air driven nail gun that can drive nails to a certain depth.

(Means for Achieving the Object) In order to achieve the above object, the nailing machine according to the present invention drives a piston in a cylinder downward with compressed air, and drives a nail by a driver provided integrally with the piston. In a nailer for driving nails, a grip connected to a compressed air supply source and equipped with a trigger valve for starting operation, a nail loading magazine, a nail feeding means for sending nails to an injection section, and a nail driver that collides with the lower surface of the piston during driving. A piston having a nail-driving driver and a nail-driving machine body formed by integrally combining a bumper means for absorbing the impact of the piston and an injection part for driving the nails supplied by the nail-feeding means. A cylinder that slidably accommodates a piston, a head valve that controls the inflow and outflow of compressed air to the cylinder in conjunction with the trigger valve, and a storage chamber for compressed air that is supplied into the cylinder under the control of the head valve. A cylinder housing integrally coupled with the nail gun is provided so as to be movable according to the nail driving method, and a cylinder housing is provided between the compressed air storage chamber of the cylinder housing and the grip of the nail gun main body, and between the head valve of the cylinder housing and the trigger of the nail gun main body. It is characterized by providing connection means for connecting the valves to each other.

(Operations and Effects of the Invention) According to the above configuration, compressed air is pumped from the compressed air storage chamber into the cylinder by applying the tip of the injection part to the surface of the material to be driven and operating the trigger valve to operate the head valve. The piston is driven and the driver drives the nail from the injection part. When the piston is driven in this manner, the cylinder housing receives a force to move in the opposite direction to the driving direction due to the reaction force. Since the cylinder housing is provided to be movable relative to the nail gun main body, only the cylinder housing moves while the injection portion of the nail gun main body remains in contact with the material to be driven.

As described above, according to the present invention, the reaction force of the piston drive is absorbed by the movement of the cylinder housing, and the nailer main body is not affected by the reaction force, so that accurate nailing can be performed. At the same time, there is no need to hold the nailer body by hand, and the driving depth of the nail does not change depending on whether or not the nailer body is pressed by hand, so the nail is always driven to a constant depth. be able to.

Furthermore, there is no need to additionally provide a recoil absorbing member to absorb the recoil of the nailer, and there is no need to secure impulse space for it in the housing, so the weight of the nailer is the same as that of conventional nailers.・It is possible to design the size.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Note that FIG. 1 is a longitudinal cross-sectional view of a nailing machine according to the present invention, and FIG. 2 is a cross-sectional explanatory plan view of a nail feeding device of a magazine of the nailing machine.

In FIG. 1, reference numeral A indicates a nail gun. This nailing machine A is driven by compressed air and is mainly composed of a nailing machine main body 1 and a cylinder housing 2.

Nailer body 1 includes grip 3 and nail loading magazine 4
a nail feeding means 4a for feeding the nail to the injection section side; a bumper means 5 for absorbing the impact of the piston by colliding with the lower surface of the piston during driving; and an injection section 6 for driving the nail supplied by the nail feeding means 4a. It is formed by combining the two into one.

The grip 3 is formed hollow, and a compressed air intake port 8 communicating with a compressed air supply source 7 is formed at the base end, and an open end 9 is opened at the opposite end. At the top of the diagram is the first
The first movable tube body 11 is slidably fitted to one end of the movable tube body 11 of the first
An air passage 10 is formed therein, and a trigger valve 14 is installed at the bottom. Inside the grip 3, a second movable tube 1 is connected to the compressed air intake 8.
2 and one end of each of the second air passages 13 are connected. The second movable tubular body 12 has flexibility, and the other end protrudes from the end 9 to the outside of the grip 3.
The other end of the second air passage 13 is a trigger valve 1
4 to the first air passage 10.

The trigger valve 14 controls the supply and discharge of compressed air to and from the first air passage 10, and by pushing the valve stem 15 which is spring-loaded to the outside of the grip 3, the trigger valve 14 is connected to the first air passage 10. The valve body 16 at a position connecting with the second air passage 13 closes the second air passage 13 and directs the compressed air in the first air passage 10 to the valve stem 1.
5 to a position where it is discharged from the outer periphery to the atmosphere. A trigger lever 42 for pushing the valve stem 15 is arranged opposite to a contact arm 17 provided on the nailer main body 1.

The lower part of the grip 3 is provided with a storage part 18 for storing a coil-shaped connecting nail, and a nail passage 19 leading from the storage part 18 to the nail injection part 6.A nail feeding means is provided near the tip of the nail passage 19. A nail loading magazine 4 provided with 4a is arranged. Nail feeding means 4
As shown in FIG. 2, the tip of the feed piston 20 is pushed back by supplying compressed air from the opening 21 to the feed piston 20, which is spring-biased in the nail feeding direction within the nail feed cylinder. A rotatably provided feeding claw 43 is moved left and right in FIG. 2, thereby feeding the connecting nails in the nail passage 19 forward one by one.

The injection part 6 has a nail driving passage 22 that opens at the tip of the nail passage 19 of the nail loading magazine 4, and the pressing member 1 of the contact arm 17 is provided at the tip of the injection port.
7a is placed. Further, a large diameter cylindrical part 23 and a small diameter cylindrical part 24 are integrally formed coaxially with the driving passage 22 at the base of the injection part 6 (upper part in FIG. 1) via a stepped part 44. Bumper means 5 is provided inside the portion 23.

Next, the cylinder housing 2 includes a piston 26 having a nail driving driver 25 and a piston 26 having a nail driving driver 25.
A cylinder housing 2 that integrally combines a cylinder 27 that slidably houses a cylinder 27 and a head valve 28 that controls the entry and exit of compressed air into the cylinder 27.
is provided movably in the direction of nail injection.

The nailing driver 25 is provided facing the injection part 6 of the nailing machine main body 1, and has a piston 26.
The lower surface of the nail gun is disposed so as to face the bumper means 6 of the nail gun main body 1.

An opening 29 is formed in the side wall of the cylinder housing 2 facing the grip 3, and a main air chamber (compressed air storage chamber) 30 and a blowback air chamber 31 are provided between the cylinder 27 and the cylinder housing 2. is provided. The aperture 29 communicates with the main air chamber 30, and the end of the second movable tube 12 in the grip 3 fits into the aperture 29. The main air chamber 30 communicates with the cylinder 27 via an opening 32 for the inflow of compressed air. The blowback air chamber 31 is connected to the cylinder 27 by a through hole 33.
It communicates with the inside and is connected to the cylinder 27 of the nail feeding means 4a via a third movable tube body 34 having flexibility.

The head valve 28 is provided in the upper part of the cylinder 27, and one end (the upper surface of the figure) of the valve body 35 accommodated in the valve cylinder 36 is connected to the upper chamber 3 of the head valve.
6a, and the other end (lower surface in the figure) is arranged so as to face the compressed air inflow opening 32 and the air chamber. The upper chamber 36a of the head valve 28 communicates with the first air passage 10 of the nailer main body 1 via the first movable tube 11. One end of the first movable tube 11 is fixed to the upper chamber 6a of the head valve 28, and the other end is fixed to the trigger valve 14.
The first air passage 10 is slidably fitted into the first air passage 10 leading to the first air passage 10 . The head valve 28 is configured such that compressed air is supplied from the first movable tube body 11 to the upper chamber 36a, and the air pressure acts on the one end of the valve body 35, and the air pressure received from the main air chamber 30 acts on the other end. Due to the differential pressure, the compressed air inlet opening 3
2 is closed, and the first movable tube body 1 is removed from the upper chamber 36a.
The compressed air is discharged through the opening 32 and the differential pressure between the two ends of the valve body 35 is reversed.
It operates to open and controls the inflow and outflow of compressed air from the main air chamber 30 to the cylinder 27.

37 is an exhaust valve, main air chamber 30
An exhaust hole 38 communicates the upper surface of the piston 26 with the atmosphere when the head valve 28 is at the bottom dead center position.
The head valve 28 and the spring 3
9 and is normally positioned to open the exhaust hole 38, with the head valve 28 communicating with the inlet opening 32.
When the opening operation is performed, the exhaust hole 38 is moved to the closed position by the spring force.

Next, a cylindrical portion 40 is provided on the nail driving side end of the cylinder housing 2 on the same axis as the driver 25.
is formed, and an inner step portion 44 is formed at the tip thereof. This cylindrical portion 40 surrounds the large diameter cylindrical portion 23 and the small diameter cylindrical portion 24 of the nailer main body 1 from the outside. A compression spring 41 is interposed between the stepped portion 44 between the large diameter cylindrical portion 23 and the small diameter cylindrical portion 24 in the nailer main body 1 and the stepped portion 45 at the tip of the cylindrical portion 40 of the cylinder housing 2. equipped. As a result, the nailer main body 1 and the cylinder housing 2 are connected so as to be movable in the nail driving direction against the compression spring 41, and the relative positions of the nailer main body 1 and the cylinder housing 2 are kept constant. Since it is held, the compression spring 41 functions as a positioning means.

Next, the operating mode of the nailing machine having the above configuration will be explained.

First, before nail driving, compressed air from the compressed air supply source 7 is supplied to the air chamber 30 via the second movable tube body 12 which is a connecting means, and
Air is supplied from the second air passage 13 via the first air passage 10 to the head valve upper chamber 36a via the first movable tube 11, which is a connecting means, by the trigger valve 14. Therefore, the opening 32 between the cylinder 27 and the main air chamber 30 is connected to the valve body 35.
is held closed by. Next, the tip of the injection part 6 of the nailer main body 1 is pressed together with the tip of the contact arm 17 against the surface of the material to be driven, and when the trigger lever 42 is pulled, the trigger valve 14 is activated and the compressed air in the head valve upper chamber 36a is pressed. is exhausted and the valve body 35 of the head valve 28 moves to the position where the opening 32 is opened, so that compressed air is supplied from the main air chamber 30 to the cylinder 27. Since the compressed air acts on the upper surface of the piston 26, the piston 26 is driven downward and drives the nail supplied to the injection part 6 into the member to be driven. However,
When the compressed air is supplied into the cylinder 27,
At the same time as it acts on the upper surface of the piston 26, the reaction force of the air pressure also acts on the upper bottom surface of the cylinder 27, so that the cylinder housing 2 is lifted in the opposite direction to the nail driving direction. Since the cylinder housing 2 and the nailer main body 1 are connected so as to be movable in the above-mentioned direction, the cylinder housing 2 springs up against the spring force of the compression spring 41; The formed injection part 6 is held in contact with the surface of the material to be implanted. Therefore, the shock during nail driving is absorbed, so nailing can always be performed accurately. In addition, since the nailer body 1 does not move in this way, there is no need to press the nailer body 1 by hand, and the driving depth of the nail does not change depending on whether or not the nailer body 1 is pressed by hand. can be driven to a constant depth.

When the piston 26 is driven downward, the air inside the lower cylinder 27 is compressed and flows through the through hole 33.
This compressed air is fed into the blowback chamber 31 from the third movable tube body 34 to the feeding means 40, actuating the feeding piston 20, and after driving the nail, the next nail is sent to the injection section 6. supply

Note that when the cylinder housing 2 moves relative to the nailer main body 1 as described above, the second movable tube 12 and the third movable tube 34 easily follow the relative movement. Furthermore, the first movable tube 11 connecting the upper chamber 36a of the head valve 28 and the trigger valve 14 can slide within the first air passage 10 to absorb the relative movement.

Moreover, since the nailer main body 1 and the cylinder housing 2 are positioned at predetermined positions by the compression spring 41 after nail driving, the nailer can always operate smoothly.

In addition, the movement range of the cylinder housing 2 with respect to the nailer body 1 is set so that the piston 26 is driven in the driving direction and hits the bumper means 5 before the cylinder housing 2 moves and reaches the top dead center. If the cylinder housing 2 moves and reaches the top dead center when the piston 26 hits the bumper means 5, the nailer body 1 will be lifted up after the piston 26 hits the bumper means 5. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a nailing machine according to the present invention, and FIG. 2 is a cross-sectional view in a plane of a nail feeding device of a magazine of the nailing machine. Code, A... Nailer, 1... Nailer body, 2...
...Cylinder housing, 3...Grip, 4...
Magazine, 4a... Nail feeding means, 5... Bumper means, 6... Injection part, 11... First movable tubular body, 1
2...Second movable pipe body, 25...Driver, 26
... Piston, 27 ... Cylinder, 28 ... Head valve, 41 ... Compression spring (positioning means).

Claims (1)

[Scope of Claims] 1. In a nailing machine that drives a piston in a cylinder downward with compressed air and drives a nail with a driver provided integrally with the piston, the nailing machine is connected to a compressed air supply source and the starting operation is performed. A grip in which a trigger valve is arranged, a nail loading magazine, a nail feeding means for sending nails to the injection part side, a bumper means for absorbing the impact of the piston by colliding with the lower surface of the piston during driving, and the above nail feeding means. The main body of the nailing machine is made up of an injection part for driving nails, and a piston that has a nail driving driver, a cylinder that slidably houses the piston, and a system that allows compressed air to flow in and out of the cylinder. A cylinder housing is provided, which is movable in the nail driving direction, in which a head valve for controlling the nail and a storage chamber for compressed air supplied into the cylinder by the control of the head valve are integrally connected, and the compressed air in the cylinder housing is movable in the nail driving direction. 1. A nailing machine, characterized in that it is provided with connection means for respectively connecting between the storage chamber of the nail gun and the grip of the nailing machine body, and between the head valve of the cylinder housing and the trigger valve of the nailing machine body.