JPH0544062Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention uses compressed air as a driving source to reciprocate a striking piston that is slidably and tightly fitted into a striking cylinder, and is integrally connected to this striking piston. The present invention relates to a pneumatic nailing machine that drives a nail into a target object, that is, a member to be driven, using a percussion driver.

(Prior Art) Usually, a nailer driven by compressed air includes a percussion cylinder, a percussion piston housed in the percussion cylinder so as to be able to reciprocate, and a cylinder of the nailer main body that accommodates these. a nose forming a nail injection hole formed in a lower portion; a hammer driver integrally connected to the lower surface of the hammer piston and capable of sliding within the nail injection hole; It consists of an air chamber and a head valve that selectively connects to the atmosphere. Also,
A nail supply opening for continuously supplying mutually connected nails into the injection hole is formed in the side surface of the nose, and further a nail supply opening for continuously supplying mutually connected nails into the injection hole through this opening. A mechanism is located near the opening.

In the conventional nailing machine mentioned above, the percussion piston normally waits at the top dead center position of the percussion cylinder, and is lowered by the compressed air pressure introduced into the percussion cylinder based on the operation of the start valve that operates the head valve. A nail or the like that has been supplied into the injection hole in advance is driven into the driven member by a striking driver fixed to the lower surface of the striking piston. After the striking piston reaches the dead center, the striking piston automatically returns to the top dead center by receiving the pressure of the compressed air accumulated in the return air chamber on the lower surface side while being driven. Here, adjacent nails are connected to each other by a plastic band or wire, and the nails are guided and supplied along a nail supply guide connected to one side edge of the nail supply opening. It is sequentially supplied into the hole. Further, the nail supply mechanism includes, for example, a nail supply cylinder disposed along the nail supply guide, a nail supply piston housed in the cylinder, and a nail supply piston attached to the tip of the piston rod and connected to the nail supply cylinder. and a nail feeding claw member that can engage with the shank of the nail, and the nail is automatically fed into the injection hole by the claw member that reciprocates in conjunction with the operation of the striking piston. ing.

Incidentally, recently there has been a demand for using the above-mentioned nailing machine to construct a roofing material called Color Best (trade name) in order to improve work efficiency. This type of material is brittle and will crack if nailed directly, so holes for nailing are pre-formed.

(Problem to be solved by the invention) However, in the structure of such a conventional nailing machine, the nail supplied into the injection hole is located inside the injection hole while being held by the connecting member. Normally, it does not protrude from the tip of the nose, and the nail hole in the roof is hidden by the lower end of the nose, making it impossible to aim accurately at the nail hole.
There was a problem in that it was not possible to accurately drive nails into the nail holes.

Therefore, the present invention was devised to solve the above-mentioned problems of the prior art.The purpose of the present invention is to make the tip of the nail protrude a predetermined length from the tip of the nose, so that the tip of the nail can be driven into the nail. To provide a pneumatic nailer which can be inserted into a nail hole of a member to facilitate positioning of the nailer body, and can be supported by protruding from the first one to the tip of the nose when loading connected nails. There is a particular thing.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the injection hole in the nose protruding from the nail gun body is reciprocated and the nail is fed into the injection hole. a percussion driver for driving out nails from the tip of the nose; a percussion piston integrally connected to the driver; a percussion cylinder in which the percussion piston is slidably and tightly fitted; a main air chamber connected to an air pressure source; a head valve for switching between the piston upper chamber of the striking cylinder and the main air chamber or the exhaust hole; a trigger valve for sending an operating signal to the head valve; and a trigger valve formed on a side surface of the nose. nail supply means for continuously supplying interconnected nails into the injection hole through an opening; a push piston actuated along a nail driving axis in the nose; an extrusion member configured to be able to protrude and retract from the radial direction on the nail driving axis in the nose in conjunction with the operation of the push piston; and a pusher member that slidably accommodates the push piston and operates the push piston a cylinder mechanism that causes the extrusion member to protrude into the nose and move toward the tip of the nose to dissociate the nail from the connected state and protrude a predetermined length from the tip of the nose; means for controlling the operation of the pushing member and the cylinder mechanism so that the leading nail is disengaged from the connected state and supported by protruding from the tip of the nose upon termination; and the nail supplying means is for loading the connected nail. A door member that is operated to open and close;
a door valve that is operated by opening and closing the door member; the door valve is interposed between the trigger valve and the cylinder mechanism, and the door valve is connected to the cylinder mechanism and the trigger valve when the door member is closed; The trigger valve is configured to make a connection between the door member and the trigger valve to operate the push piston, and when the door member is released, the connection is cut off to allow the push piston to perform a return operation.

(Function) In the present invention having the above configuration, the nail supplied into the injection hole of the nose is disengaged from the connected state and is held protruding from the tip of the nose by a predetermined length, thereby preventing the nail from being hit by the nail. Allows for positioning of inserted members. Further, since the nail can be directly inserted into the nail hole, the nail hole can be aimed accurately, and since the nail is driven while the nail is inserted into the nail hole, there is no misalignment between the nail and the nail hole. In addition, when a connected nail is loaded into the nail supply means, the leading nail is released from the connected state when loading is completed, and is supported by protruding from the tip of the nose. Even if you load the connecting nail while connected to the source, the first
You can prepare one book at the tip of the nose without having to hit the book blank.

(Example) The present invention will be explained below based on the illustrated example. FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the pneumatic nailing machine of the present invention, and shows a state in which the striking piston is located at the top dead center. As shown in the figure, a percussion cylinder 3 is disposed inside the nailer main body 1, and a percussion piston 4 is slidably and tightly fitted inside the percussion cylinder 3. A percussion driver 5 as a nail driving member is integrally connected to the lower surface side of the percussion piston 4. A nose 6 is protruded from the lower end of the nailer main body 1.
In the nose 6, an injection hole 6a for guiding the impact driver 5 is formed coaxially with the impact cylinder 3. Driving air for driving the striking piston 4 is supplied from a main air chamber 8 provided at the grip portion 7 of the nail gun main body 1 and around the striking cylinder 3.

An annular head valve 9 is disposed at the upper end of the striking cylinder 3. The head valve 9 has a slidable head valve piston 11 tightly fitted inside a head valve cylinder 10 which is formed in an annular hole in the upper end portion of the nailer main body 1. Further inside the head valve 9, a piston stop 15 made of an elastic member is disposed, and when the striking piston 4 returns to the top dead center, rebound is reliably prevented.
hold. The piston stop 15 is integrally formed with an overhanging portion 15a extending toward the outer periphery, and is brought into contact with and away from the inner peripheral wall of the piston 11 as the head valve piston 11 moves up and down, thereby opening and closing the piston to the atmosphere.

The head valve piston 11 has an opening/closing piston part 12 at its lower end that opens and closes between the main air chamber 8 and the upper chamber 4A of the striking piston, and an operating large-diameter piston part 13 at its upper end. When the head valve piston 11 is at the bottom dead center (the state in which the opening/closing piston part 12 is in contact with the upper edge of the striking cylinder 3 via the O-ring 14), the opening/closing piston part 12 is in contact with the main air chamber. 8 and the upper chamber 4A of the striking piston, and its inner circumferential wall communicates with the atmosphere, and when it is at the top dead center, the space between the main air chamber 8 and the upper chamber 4A of the striking piston is closed. are communicating. Reference numeral 16 denotes a compression spring interposed between the piston stop 15 and the opening/closing piston portion 12 of the head valve piston 11, which always urges the head valve piston 11 toward the bottom dead center. Blow cylinder 3
A large number of small holes 17 are provided in the radial direction approximately in the middle part in the axial direction.
This small hole 17 and a return air chamber 18 formed on the outer peripheral side of the impact cylinder 3 communicate with each other via a check valve 19.

Reference numeral 20 denotes a trigger valve provided inside the base end of the grip portion 7, which is used to send an activation signal to the head valve 9, and is connected to passages A and B formed around the main air chamber 8 and the striking cylinder 3. A housing 21 in which a communication hole 22 is formed to communicate with the housing 21.
The pilot valve 23 is attached to the housing 21 so as to be movable up and down, and the trigger valve stem 25 is attached to the cap 24 so as to be retractable from within the pilot valve 23. A compression spring 26 is interposed between the trigger valve stem 25 and biases the trigger valve stem 25 in the projecting direction. In the initial state, a gap is formed between the housing 21 and the O-ring 29 of the pilot valve 23, and air introduced into the main air chamber 8 by an air pressure source such as a compressor (not shown) flows through the gap. It passes through the communication hole 22 and is supplied to the passages A and B via a door valve, which will be described later. On the other hand,
When the trigger valve stem 25 is operated by pulling the trigger lever 28 upward, the pilot valve 23
descends and closes the gap with an O-ring 29, and passages A and B are opened to the atmosphere through a communication passage 22 and a passage 27 serving as an exhaust hole formed between the housing 21 and the cap 24.

In FIG. 2, 30 is a door valve connected to the trigger valve 20, and is composed of a sleeve 31 and a door valve stem 33 that is constantly urged downward by a spring 32 inside the sleeve 31. The door valve stem 33 has a small diameter portion 3.
3a is formed. By closing the opening/closing door 34, the door valve stem 33 is pushed upward and communicates with the passages A and B from the communication hole 22 of the trigger valve 20 through the small diameter portion 33a.

In FIG. 3, reference numeral 40 denotes a push cylinder integrally formed around the impact cylinder 3. A push piston 41 is tightly fitted into this push cylinder 40, and a push stem 42 is screwed into this push piston 41. It is worn. The push stem 42 has a hollow cylindrical shape, and a push housing 43 is attached to its lower end. A push rod 45 as a push-out member is provided within the push housing 43 and is biased in the retracting direction by a spring 44. Further, the passage B is a small hole 48 formed in the peripheral wall of the push cylinder 40.
a, and further through the small hole 41a of the push piston 41, which is narrower than this small hole 48a, into the upper chamber 46.
It communicates with And with no air connection,
That is, when driving air is not supplied to the passage B, the push piston 41 is urged upward by the compression spring 47 and is located at the top dead center within the push cylinder 40, and the push rod 45 is It is retracted by the biasing force of the spring 44.
The push rod 45 is configured to be retractable into the injection hole 6a through a notch 6b formed in the axial direction of the nose 6. On the other hand, when connecting with air,
Driving air is supplied to the passage B through the trigger valve 20, and the first outer peripheral chamber 4 of the push cylinder 40
0a and the push stem 42 through the small hole 48a.
The liquid flows into the inner conduit and causes the push rod 45 to protrude into the injection hole 6a of the nose 6. Next, the push piston 41 is moved downward by air supplied to the push piston upper chamber 46 through the small hole 41a.
When it moves down to the position of the small hole 48b, the small hole 48
Air from b is added, and the push piston 41
descend. This downward movement of the push piston 41 causes the push rod 45 to move into the injection hole 6a.
While pushing the head of the nail N supplied inside, the nail is released from the connected state, and the nail N is made to protrude a predetermined length from the tips of the vertical guides 50 and 51 and then stopped. In this case, the head of the nail N is held down by the push rod 45. Since the small hole 48a is formed to have a larger diameter than the small hole 41a, a large amount of driving air is supplied from the push piston upper chamber 46 to the conduit inside the push stem 42. The push rod 45 is projected into the nose 6 earlier than the push piston 41 is lowered.

As described above, by causing the tips of the nails N to protrude from the vertical guides 50 and 51 by a predetermined length, the nails N can be used to position the members to be driven relative to each other. Further, since the nail N can be inserted directly into the nail driving hole, the nail hole can be aimed accurately. Furthermore, since the nail is driven while being inserted into the nail hole, there is no misalignment of the nail with respect to the nail hole.

The vertical guides 50, 51 are attached to the tip of the nose 6 so as to be able to open outwards around pins 52, 52 as shown in FIG. 4a, and are closed by torsion coil springs 53 as shown in FIG. biased in the direction. Further, a vertical guide presser 49 as a holding means is provided on the nose 6 side of the push housing 43, and as the push piston 41 descends, the vertical guide presser 49 closes the vertical guides 50, 51 as a chuck mechanism. By entering this position, the vertical guides 50, 51 are prevented from rotating in the opening direction, so the movement of the nail N in the orthogonal direction is restricted and the nail N can be firmly held. Thereby, the members to be driven can be accurately positioned with respect to each other.

When the trigger lever 28 is off, the push rod 45 has the function of protruding into the nose 6 to press down and hold down the nail N, and the vertical guide presser 49 has the function of firmly holding the nail N. When the trigger lever 28 is on, the push rod 45 and the vertical guide presser 49 are retracted from inside the nose 6 before the impact driver 5 is lowered, and the vertical guides 50, 5
1, the lowering of the impact driver 5 will cause the push rod 45 and the vertical guide 5 to be released.
0 and 51, in this embodiment, a timing valve 60 as a control mechanism is provided integrally around the striking cylinder 3, as shown in FIG. That is, when the trigger lever 28 is pulled, the air in the push cylinder 40 is first exhausted from the passage B through the trigger valve 20, the push piston 41 is moved upward by the compression spring 47, and the push rod 45 is moved upward by the compression spring 47. 44, it is retracted from inside the nose 6. and,
A timing valve 6 communicates with the second outer peripheral chamber 40b of the push cylinder 40 through a communication passage 62.
0, the outer peripheral chamber 65 is at atmospheric pressure, but the lower chamber 63 of the timing valve 60 is connected to the outer peripheral chamber 65 and the small hole 66.
As a result, the air in the lower chamber 63 is gradually discharged, so that the timing valve stem 64 is lowered with a delay in the operation of the push rod 45. By lowering the stem 64, the upper chamber of the head valve 9 is connected to the passage A, and the air in the upper chamber of the head valve 9 is exhausted through the trigger valve 20.
Then, the head valve piston 11 is moved upward, whereby the driving air in the main air chamber 8 is introduced into the striking cylinder 4, and the striking piston 4 is moved down to drive a nail.

By providing the timing valve 60 as described above, the push rod 45 and the vertical guide presser 49 are released before the percussion driver 5 is lowered, so that the push rod 45 by the percussion driver 5 can be released.
Also, damage to the vertical guides 50 and 51 can be prevented.

As shown in FIG. 1, the impact driver 5 has a metal shaft 5a with a small diameter, a plastic cylindrical body 5b fitted on the outer circumferential side of the shaft 5a, and a cylindrical body 5b fitted into the shaft 5a. It consists of a metal nut 5c for screwing onto the shaft 5a. Axis 5a
As the material, a metal having high toughness, high tenacity, and high tensile strength, such as iron, is selected. In addition, the material of the cylindrical body 5b is rich in lubricating activity,
Items with a small coefficient of linear expansion, such as PA, POM,
Engineering plastics etc. will be selected.
As a result, the weight of the impact driver 5 can be reduced, and the driving force, recoil, and durability are equivalent to a normal solid metal driver, and the cost can be significantly reduced compared to a driver with a half-moon cross section. .

70 is a contact arm, and this contact arm 70 is mechanically interlocked with the trigger lever 28 and is arranged so as to be able to reciprocate in the axial direction of the nose 6, and is always positioned above the tips of the vertical guides 50 and 51. The trigger lever 2 is biased to protrude, and by pressing the tip against the workpiece, the trigger lever 2
It functions as a kind of safety device that allows the lifting operation of 8.

At the side of the nose 6 through which the impact driver 5 injects the nails N, a nail is provided as a nail supply means for supplying the connected nails stored in the magazine one by one into the injection hole 6a through the opening 100. A feeding mechanism 80 is provided. This nail feeding mechanism 80 has a feed piston cylinder 8 as shown in FIG. 5a.
A feed piston 82 is provided so as to be movable within the feed piston 1, and this feed piston 82 is always urged leftward by springs 83 and 84. 85 is a spring guide for guiding the springs 83 and 84, and is attached to a spring collar 86.
87 is a feed claw attached to the feed piston 82, and is used to feed the nail N into the injection hole 6a. 90 is a magazine that stores connecting nails. Further, the front chamber 88 of the feed piston cylinder 81 communicates with the return air chamber 18 through a communication passage 89.

Since the nail feeding mechanism 80 is configured as described above, it operates as follows. In the normal state shown in FIG. 5a (when the striking piston 4 is at the top dead center side), the inside of the return air chamber 18 is communicated with the atmosphere through the communication hole 6c formed in the nose 6. The front chamber 88 of the feed piston cylinder 81, which communicates with the return air chamber 18, is at atmospheric pressure. Therefore, the feed piston 82 is in the forward position due to the urging force of the springs 83 and 84. In this state, the feed claw 87 is
The shaft of the th nail is pushed to make the first nail enter the nose 6. After that, while the striking piston 4 is driven and reaches the bottom dead center side, or after reaching the bottom dead center side, as shown in FIG.
As shown in FIG. 2, a part of the compressed air that has flowed into the return air chamber 18 is introduced into the front chamber 88 of the feed piston cylinder 81. As a result, the feed piston 82 moves backward against the urging force of the springs 83 and 84, and the feed pawl 87 engages with the shaft of the next nail. Furthermore, after the striking piston 4 returns to the upward position, the pressure inside the return air chamber 18 becomes atmospheric again, and the front chamber 88 of the feed piston cylinder 81 also becomes atmospheric pressure, and the springs 83 and 84 are activated in the same way as in the normal state. The leading nail is sent into the injection hole 6a in the nose 6 by the urging force.

By the way, to explain a series of operations of the nailer main body 1 in this embodiment, in the initial state when the nailer main body 1 is connected to an air supply source (not shown) such as a compressor, the operations shown in FIGS. As shown in the figure and FIG. 6, driving air is introduced into the main air chamber 8 from an air supply source, and this driving air is supplied to both passages A and B via the trigger valve 20 and door valve 30. be done. This passage A leads to a timing valve 60. Further, the air in the passage B moves the push piston 41 and the push rod 45 in the projecting direction, as shown in FIG. Here, a part of the air that is lowering the push piston 41 is supplied to the lower chamber 63 of the timing valve 60 via the communication passage 62. This air causes the timing valve stem 63 of the timing valve 60 to be positioned upward. At this position of the timing valve stem 63,
Air is supplied from the main air chamber 8 to the upper chamber 9a of the head valve 9 to close the main valve 9. That is, the head valve piston 11 is connected to the upper end of the striking piston 4.

Next, when the trigger lever 28 is pulled up, the trigger valve stem 25 is retracted into the housing 21 as shown in FIG.
are in communication with each other and are exposed to the atmosphere. This allows the air in the push piston upper chamber 46 to flow into the small hole 4.
1a, the small hole 48a, and further through the passage B, the air is exhausted from the passage 27 of the trigger valve 20. As a result, the push piston 41 and the push rod 45 are retracted to the upper position and the retracted position, respectively, by the biasing forces of the springs 47 and 44. Further, the outer circumferential chamber 65 of the timing valve 60, which communicates with the outer circumferential chamber 40a of the push cylinder 40 through the communication passage 62, is at atmospheric pressure.
The lower chamber 63 communicates with the outer peripheral chamber 65 through a small hole 66, and as the air in the lower chamber 63 is gradually exhausted through this small hole 66, the timing valve stem 64 is activated by the push rod 45. Descend late. That is, the timing valve stem 6
4 remains at that position until the inside of the lower chamber 63 reaches a predetermined pressure. However, push piston 41
It has a kind of timer function for delaying the time until it returns to top dead center.
During this time, air in the main air chamber 8 is supplied to the upper chamber 9a of the head valve 9 via the timing valve 60 to maintain the head valve 9 in the closed position.

Furthermore, when the air pressure in the lower chamber 63 of the timing valve 60 drops sufficiently, the timing valve stem 64 is moved downward by the biasing force of the spring 67, as shown in FIG. By the operation of this timing valve stem 64, the upper chamber 9 of the head valve 9
a is connected to the passage A, and the air in the upper chamber 9a is exhausted through the trigger valve 20. Then, the head valve 9 is moved upward by the air pressure in the main air chamber 8, and as a result, the driving air in the main air chamber 8 is introduced into the striking cylinder 3, and the striking piston 4 is moved downward. Then, the nail is driven. During the downward movement of the striking piston 4, a portion of the pressurized air enters the return air chamber 18 formed around the striking cylinder 3.
This pressure air is stored. Here, a part of the air pressure accumulated in this return air chamber 18 is introduced into the feed piston cylinder 81 of the above-mentioned nail feeding mechanism 80, and operates the feed piston 82 in the return direction to move the feeding claw 87 to the next one. Wait until it engages with the shank of the nail.

Next, when the trigger valve stem 25 of the trigger valve 20 is opened, air is supplied to the passages A and B in the same manner as in the above-mentioned initial state. Then, as shown in FIG. 8, the air supplied to the passage A is introduced into the upper chamber 9a of the head valve 9 via the timing valve 60, and moves the head valve 9 downward (closed).
do. Then, the engagement between the inner circumferential wall of the head valve piston 11 and the protrusion 15a of the piston stop 15 is released, and the upper part of the striking piston 4 is opened to the atmosphere, so that pressure is accumulated in the return air chamber 18. The air acting on the lower surface of the striking piston 4 returns the striking piston 4 to the top dead center. On the other hand, air supplied from the passage B is introduced above the push piston 41, and this air passes through the pipes of the push piston 41 and the push stem 42 to actuate the push rod 45 in the projecting direction. At this time, air enters the upper chamber 46 of the push piston 41 through the small hole 41a, so the pressure is not high enough, and there is a pressure that pushes down the push piston 41 against the biasing force of the compression spring 47. I haven't.

Thereafter, as the air pressure in the upper chamber 46 of the push piston 41 becomes sufficiently high, the push piston 41 moves downward as shown in FIG.
The nail supplied to the injection hole 6a is separated from the connecting member and held in a state in which the tip of the nail N protrudes by a predetermined length. Further, as the push piston 41 moves downward, the outer peripheral chamber 40 of the push cylinder 40
The air introduced in b is supplied to the lower chamber 63 of the timing valve 60 through the communication passage 62, and operates the timing valve stem 64 upward. By the operation of this timing valve 60, the air supplied to the head valve 9 is transferred from the passage A to the main air chamber 8.
It will be switched to. The above operations are instantaneously executed to perform the nail driving operation.

Next, the operating state of the door valve 30 will be explained. First, when the door 34 is opened to load nails, the door valve stem 33 is actuated downward by the spring 32, as shown in FIG. 10a, so that the passage B is opened to the atmosphere. Ru. Then, the upper chamber 46 of the push piston 41 becomes atmospheric pressure, so the push piston 41
and the push rod 45 are each brought into a retracted state by the action of the spring. Therefore, by connecting the second outer circumferential chamber 40b of the push cylinder 40 to the atmosphere, the timing valve stem 64 of the timing valve 60 moves downward. The air supplied to the head valve 9 by the operation of the timing valve 60 is transferred from the main air chamber 8 to the passage A.
However, the operation of the head valve 9 is not affected. When the opening/closing door 34 is closed after loading the nails, the door valve 30 returns to its initial state and introduces air into the passages A and B, as shown in FIG. Further, the push piston 41 and the push rod 45 are operated to the initial position in the same manner as when the trigger valve 20 is opened, and the loaded leading nail is pushed out and held at the tip of the nose 6. In this case, the timing valve 60 also performs the same operation as when the trigger valve 20 is opened.

That is, when the opening/closing door 34 is first opened to load a nail, the door valve stem 33 is moved downward by the spring 32, thereby opening the passage B to the atmosphere and releasing the air in the upper chamber of the push piston 41. is exhausted to the atmosphere. Then, the push piston 41 moves upward and the push rod 45 retracts.
At this time, the timing valve stem 64 of the timing valve 60 moves downward, but the trigger valve 2
Since the air passage 0 is not open and air is supplied to the passage A, the head valve 9 does not operate. Although the air passage from the main air chamber 8 to the head valve 9 is closed, since the door valve stem 33 has moved downward, the air passage is opened to communicate with the main air chamber 8 through the trigger valve 20. No more explosions due to leaks, etc. In this state, load the nail N into the nose 6,
When the opening/closing door 34 is closed, the door valve stem 33
moves upward, and the upper chamber 4 of the push piston 40
Air is supplied to 6 from the trigger valve 20. At this time, as described above, air passes through the conduit in the push stem 42 to project the push rod 45 into the nose 6, and then the push piston 41 is lowered to project the nail N from the tips of the vertical guides 50, 51. let At about the same time, the timing valve stem 64 moves upward, making it ready for nail driving.

Therefore, when loading nails with the nail gun main body 1 connected to the air supply source, the push piston 41
is at the bottom dead center, and the push rod 45 protrudes into the nose 6. Therefore, if a nail is fed into the nose 6 in this state, the first nail will not be held by the vertical guides 50, 51 and will be driven dry. However, as in this embodiment, a door valve 30 is provided which uses the opening/closing door 34 as a command, and the push piston 41 and push rod 45 are activated based on the nail loading.
By controlling the operation of the nails, it is possible to prepare the first nail at the injection port when loading the nails. In FIGS. 10a and 10b, 75 is a nail guide member formed integrally with the nose 6, and 76 is a nail connecting band made of plastic or the like.

By the way, in the above embodiment, the nail is attached to the nose 6.
The chuck mechanism, which is held by protruding a predetermined length from the tip of the push piston, is configured to fix the vertical guide in the closed position in response to the downward movement of the push piston, but the present invention is not limited to the above embodiment. For example, the vertical guides may be connected to each other by a spring or the like and biased in the closing direction. In short, the structure may be such that the protruding nail can be held.

(Effects of the invention) As explained above, according to the invention, the nail supplied into the injection hole of the nose is released from the connected state and held for a predetermined length from the tip of the nose. This allows the members to be driven to be positioned with respect to each other, improving work efficiency. In addition, since the nail is directly inserted into the nail hole and driven, there is no deviation in the driving position and the driving accuracy is high. Furthermore, since the nail remains in the nail hole without retracting the nail hole guide or the like to drive the nail, it is possible to prevent the nail from slipping. Furthermore, even if you load the connected nails with the nailer body connected to the air pressure source,
Since the nose tip of the first nail can be protruded and supported without dry driving the first nail, there is no need to dry drive the nailer and there is no burden on the tool due to dry driving. play.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a pneumatic nailing machine according to the present invention, FIG. 2 is a vertical cross-sectional view of essential parts showing a trigger valve and a door valve in the same embodiment,
FIG. 3 is a longitudinal sectional view showing the state of communication between the push cylinder and each valve in the same embodiment, and FIGS. 4a and 4b are partial sectional views showing the chuck mechanism in the same embodiment.
A plan view, FIGS. 5a and 5b are longitudinal sectional views showing the nail feeding mechanism in the same embodiment, FIGS. 6, 7, and 8.
FIG. 9 is a longitudinal sectional view showing the operation of each valve in the same embodiment, and FIGS. 10a and 10b are longitudinal sectional views showing the operation of the door valve in the same embodiment. Explanation of symbols, 1... Nailer body, 3... Hit cylinder, 4... Hit piston, 5... Hit driver, 5a... Shaft, 5b... Cylindrical body, 6... Nose, 6a... Injection Hole, 8... Main air chamber, 9... Head valve, 20... Trigger valve, 27... Passage (exhaust hole), 28... Trigger lever, 30... Door valve, 33... Door valve stem, 40... ... Push cylinder, 41 ... Push piston, 42 ... Push system, 45
... Push rod (pushing member), 49 ... Vertical guide presser (holding means), 50, 51 ... Vertical guide (chuck mechanism), 60 ... Timing valve (control mechanism), 62 ... Communication path, 66 ... small hole,
70... Contact arm, 80... Nail feeding mechanism (nail feeding means), 87... Feeding claw, 100... Opening.

Claims (1)

[Scope of Claim for Utility Model Registration] This driver is integrally connected to a striking driver that reciprocates through an injection hole in a nose protruding from the nailer body and drives out nails supplied into the injection hole from the tip of the nose. a percussion piston, a percussion cylinder in which the percussion piston is slidably and tightly fitted, a main air chamber connected to an air pressure source, and a space between the piston upper chamber of the percussion cylinder and the main air chamber or for exhaust. A head valve for switching operation between the injection hole and the injection hole, a trigger valve for sending an activation signal to the head valve, and a continuous supply of interconnected nails into the injection hole through an opening formed in the side surface of the nose. a pneumatic nailing machine having a nail feeding means, a push piston operated along the nail driving axis in the nose; and a push piston operated along the nail driving axis in the nose in conjunction with the operation of the push piston. A pushing member configured to be able to come out and go in and out from a radial direction and the push piston are slidably accommodated therein, and the pushing piston is actuated to project the pushing member into the nose and move toward the tip of the nose. a cylinder mechanism that releases the connecting nail from the connected state and projects it a predetermined length from the tip of the nose; means for controlling the operation of the extrusion member and the cylinder mechanism so as to protrude and support the extrusion member; and a door member through which the nail supply means is operated to open and close for loading connected nails;
a door valve that is operated by opening and closing the door member; the door valve is interposed between the trigger valve and the cylinder mechanism, and the door valve is connected to the cylinder mechanism and the trigger valve when the door member is closed; The push piston is configured to be connected between the trigger valve and the trigger valve, and when the door member is released, the connection is cut off and the push piston is operated to return. A pneumatic nailer featuring: