JPH0437735Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a nail feeding mechanism that feeds the nail to the nose portion before driving the main valve actuation mechanism when a starter valve is actuated during nail driving.

(Prior art and its problems) Device described in Japanese Utility Model Publication No. 56-40534 and Japanese Utility Model Publication No. 56-23011 As shown in Japanese Utility Model Publication No. 56-40534, in a normal nailing machine, the feed claw is normally placed at the top. It is arranged at the front position where the nail is pushed into the nose part pressure, that is, at the position closest to the nail supply destination side to the nose part. Immediately after the nail in the nose portion is driven by the impact driver, it is configured to retreat to a position on the nail supply source side where the next nail is restrained.

By the way, when loading nails into a nail gun or replacing nails with nails of a different size, manually move the feed claw on the nail supply side to the nail supply side, and then insert the loaded nail. You may also need to remove the pre-loaded nails. However, since the feed pawl is elastically biased toward the nail supply destination, large force and troublesome operations are required to retract it toward the nail supply source.

In addition, the feed claw is normally located at the nail supply source side, and is operated to the nail supply destination side in response to a nail driving operation command, so that nail feeding and nail driving can be performed at the same time. The one that did this was in 1984.
Disclosed in No. 23011. According to this method,
Normally, the feed claw is located on the nail supply side, away from the nose part, which is convenient as it eliminates the hassle of loading or replacing nails, but it is convenient to use compressed air by operating the trigger lever. Because the main valve that drives the impact driver and the nail feeding piston are operated simultaneously by switching,
The percussion driver operates before the nail is completely fed by the feed claw, leading to dry driving or galling of the driver and the nail within the nose, which may damage the tool.

(Technical problem of the invention) The present invention solves the above-mentioned drawbacks, and in particular, makes it easy to load and replace nails in the nail gun, and also eliminates the risk of dry driving and galling between the percussion driver and the nail. The technical problem is to provide a nail feeding mechanism for a nailing machine that does not have a conventional nail gun.

(Means for Achieving the Problems) In order to solve the above problems, the nail feeding mechanism in the nailing machine according to the present invention includes a main valve that drives and controls a percussion piston housed in a main cylinder and integrally coupled with a percussion driver. an actuation mechanism, a starting valve that opens and closes operating compressed air from an air source to the main valve actuation mechanism by manual operation, and a feed claw that sequentially supplies nails into a nose portion that slides and guides the impact driver. In a nailer equipped with a nail feeding piston/cylinder mechanism that reciprocates a nail feeding piston provided at its tip along the nail feeding direction, the nail feeding piston of the nail feeding piston/cylinder mechanism is reciprocated along the nail feeding direction. A port for introducing compressed air sent by the start valve is formed at the end of the nail feeding cylinder on the nail feeding source side, and the nail feeding cylinder is biased toward the nail feeding source side. A port for exhausting the compressed air introduced from the introduction port is formed on the side, and the nail feeding piston is actuated in the nail feeding direction by the compressed air introduced from the introduction port, and the nail feeding piston is The main valve actuating mechanism is actuated by the compressed air outputted from the starting valve through the inlet port and the exhaust port when the nail reaches the vicinity of the actuating end in the nail feeding direction.

(Operations and Effects of the Invention) In the above configuration, the feed pawl moves in the nail feed direction when starting nail driving, and is always on standby at the nail supply source side position. Therefore, when replacing nails, a large space is available in the vicinity of the nose portion, and the feeding claws do not become an obstacle to loading or replacing nails, making it easy to replace them.

Also, when the startup valve is activated when driving a nail, the compressed air from the air source is first fed into the nail feed cylinder through the air introduction port of the nail feed piston/cylinder mechanism to operate the nail feed piston. After supplying nails to the nose portion, the compressed air is outputted through the exhaust port, and the main valve actuation mechanism is actuated for the first time by this compressed air, and the nail driving operation is performed by the percussion driver. In this way, since the main valve operating mechanism does not operate until after the nail is supplied, there is no risk of dry driving or galling between the percussion driver and the nail. Therefore, the practical effects of the present invention are very large.

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

In the figure, the symbol A indicates a nailing machine. This nailer A includes a main valve operating mechanism that drives and controls a percussion piston 4 housed in a main cylinder 2 of a nailer main body 1 and integrally coupled with a percussion driver 3;
A starting valve 6 that opens and closes operating air from the air source 5 to the main valve operating mechanism by manual operation, and a nose portion 1 that slides and guides the impact driver 3.
A nail feeding piston/cylinder mechanism is provided for reciprocating a nail feeding piston 23 having a feeding claw 22 at its tip for sequentially feeding nails into the nail feeding direction along the nail feeding direction.

The main valve operating mechanism includes an air chamber 7 that stores compressed air from an air source 5 and a main cylinder 2.
A main valve 9 for controlling the opening and closing of the air opening 8 formed between the valve cylinder 10 is slidably accommodated in the valve cylinder 10.
A pilot valve 13 is provided in an air passage 12 communicating the upper chamber 11 and the air chamber 7, and the pilot valve 13 controls opening and closing of the air chamber 7 with respect to the upper chamber 11.

The pilot valve 13 has its valve stem 14
is normally biased by a spring 15 to a position where the upper chamber 11 is opened to the air chamber 7, and the seal portion 1 of the valve stem 14 is pressed by air supplied from the starting valve 6.
6 is moved, the upper chamber 11 is closed to the air chamber 7 and moved to a position open to the atmosphere. Therefore, when the upper chamber 11 is opened to the air chamber 7 by the pilot valve 13, the main valve 9 is in the position where the air opening 8 is closed, and the upper chamber 11 is opened to the air chamber 7 by the pilot valve 13.
When the main valve 9 is opened to the atmosphere, the main valve 9 moves in the direction of opening the air opening 8, so that the air chamber 7
Compressed air is supplied into the main cylinder 2 to drive the striking piston 4.

The impact driver 3 is slidably guided in a driving passage 17 of a nose portion 1a provided at the tip of the nailer main body 1.

The starting valve 6 is provided in an air passage 18 that connects the air chamber 7 and the pilot valve 13 of the main valve operating mechanism, and is in an open position where compressed air from the air chamber 7 is supplied to the pilot valve 13 by manual operation of a trigger button 19. and a closed position in which the supplied compressed air is exhausted to the atmosphere, thereby controlling the operation of the main valve operating mechanism.

The nail feeding piston/cylinder mechanism reciprocates the feeding pawl 22 in the nail feeding direction along a nail feeding passage 21 provided between the connected nail housing portion 20 and the driving passage 17 formed in the nose portion 1a. At the same time, the feed pawl 22 is swingably supported on the tip of the rod 24 of the nail feed piston 23, and the nail feed piston 23 is slidably accommodated in the nail feed cylinder 25, and a spring 26 is biased toward the nail supply source side, and the nail feeding piston 23 is reciprocated by this spring 26 and the air pressure of compressed air introduced into the nail feeding cylinder 25 to feed nails. It is configured. That is, an introduction port 27 for the compressed air sent by the starting valve 6 is formed at the end of the nail feeding cylinder 25 on the nail supply source side, and a port 27 for introducing the compressed air sent by the starting valve 6 is formed at the end of the nail feeding cylinder 25 on the nail supply side. An exhaust port 28 for compressed air introduced from the introduction port 27 is formed. Further, the introduction port 27 and the exhaust port 28 are connected to the air passage 18 that communicates the starting valve 6 and the pilot valve 13, and the introduction port 27 is connected to the starting valve 6 of the air passage 18.
On the side, the exhaust port 28 is connected to the pilot valve 13.
When compressed air is supplied to the air passage 18, the air is introduced into the nail feeding cylinder 25.

In the nailing machine A having the above configuration, when driving a nail, the connected nail 30 wound in a coil is first stored in the connected nail storage section 20, and its tip is passed through the nail supply passage 21 to the nose section. Load it before 1a. In this case, since the feed claw 22 is located on the nail supply source side, a large space can be obtained near the nose without moving the feed claw 22, making it easy to load nails into the nail gun A. be.

Next, when driving a nail, the trigger button 19 of the starting valve 6 is pulled and operated. Thereby, the air passage 1 leads from the air chamber 7 to the main valve actuation mechanism via the nail feed piston and cylinder mechanism.
8 is opened, and compressed air from the air chamber 7 is sent through the air passage 18 from the introduction port 27 to the nail feed cylinder 25 of the nail feed piston/cylinder mechanism. This air pressure causes the nail feeding piston 23 to slide against the spring 26 toward the nail feeding side, and when the feeding claw 22 moves along the nail supply passage 21, it connects to the connecting nail 30 and connects to the leading nail 30a. The nose part 1
It is supplied to the driving passage 17 of a. When the nail feed piston 23 reaches the vicinity of the nail feed operation end, the compressed air supplied from the introduction port 27 is output from the exhaust port 28, and is then supplied to the pilot valve 13 of the main valve operating mechanism, and the spring 15
The valve stem 14 is actuated to open the upper chamber 11 of the main valve 9 to the atmosphere, so the compressed air that had been supplied to the upper chamber 11 from the air chamber 7 is exhausted, and the main valve 9 is actuated to open the upper chamber 11 to the atmosphere. 7 and the air opening 8 between the main cylinder 2 and the main cylinder 2 are opened. As a result, compressed air is supplied from the air chamber 7 into the main cylinder 2, and the percussion driver 3 is driven together with the percussion piston 4 to slide through the driving passage 17 of the nose portion 1a.
The nail 30a supplied into the nail 7 is driven into the nail 30a. At this time, compressed air is sent into the blowback chamber 33.

After that, when the trigger button 19 is released, the air passage 18 leading to the main valve operating mechanism via the nail feeding piston/cylinder mechanism is closed, so that the air passage 18 is passed from the air chamber 7 to the nail feeding cylinder 25 of the nail feeding piston/cylinder mechanism. The compressed air sent to is exhausted from the exhaust hole 29 of the starting valve 6. Therefore, the force on the nail feed striking piston 4 is reversed, and the force on the nail feeding striking piston 4 and the feeding claw 22 is reversed.
is returned to the nail supply source side by the spring pressure of the spring 26. At the same time, the force of the pilot valve 13 of the main valve operating mechanism on the valve stem 14 is also reversed, so that the pilot valve 13 once again brings the upper chamber 11 of the main valve 9 into communication with the air chamber 7, and air is supplied from the air chamber 7 to the upper chamber 11. The main valve 9 is operated by compressed air, and the air opening 8 between the air chamber 7 and the main cylinder 2 is opened.
At the same time, the main cylinder 2 and the exhaust hole 32 communicating with the atmosphere are communicated with each other. As a result, the compressed air in the main cylinder 2 is exhausted, while the blowback chamber 33
The impact piston 4 returns to its original position due to the action of the compressed air inside.

According to the nailing machine A described above, the feeding claw 22 moves in the nail feeding direction when starting nail driving, so it is always located on the nail supply source side. Therefore, when replacing a nail, the nose portion 1 does not have to be moved without moving the feed claw 22.
A large space will be obtained near a,
Nails can be easily loaded into the nail gun A and replaced.

Furthermore, when the start valve 6 is operated during nail driving, the nail feeding piston/cylinder mechanism is operated first, and then the main valve operating mechanism is operated.
Therefore, there is no risk of dry driving or galling between the impact driver and the nail.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a nailing machine showing a nail feeding mechanism according to the present invention, and FIG. 2 is a plan sectional view of the nail feeding piston/cylinder mechanism. Code A... Nailer, 1... Nailer body, 1a...
...Nose part, 2...Main cylinder, 3...Blow driver, 4...Blow piston, 5...Air source,
6... Start valve, 13... Pilot valve,
18...Air passage, 22...Feed claw, 23...Nail feed piston, 25...Nail feed cylinder, 27...
...Introduction port, 28...Exhaust port.

Claims (1)

[Claims for Utility Model Registration] A main valve actuation mechanism for driving and controlling a percussion piston housed in a main cylinder and integrally connected to a percussion driver; A nail feeder that reciprocates along the nail feed direction a nail feed piston with a feed claw at its tip that sequentially feeds nails into the nose section that slides and guides the impact driver. A nailing machine comprising a piston/cylinder mechanism for nail feeding, wherein the nail feeding piston of the nail feeding piston/cylinder mechanism is biased toward the nail supply source side of the nail feeding cylinder, and the nail feeding piston of the nail feeding piston/cylinder mechanism is biased toward the nail supply source side of the nail feeding cylinder. An introduction port for the compressed air sent by the startup valve is formed at the end of the nail feeding cylinder, and an exhaust port for the compressed air introduced from the introduction port is formed on the nail supply destination side of the nail feeding cylinder. , actuating the nail feeding piston in the nail feeding direction by compressed air introduced from the introduction port,
A nail driving device characterized in that when the nail feeding piston reaches the vicinity of an operating end in the nail feeding direction, the main valve operating mechanism is actuated by compressed air outputted from the starting valve through the inlet port and the exhaust port. Nail feed mechanism in machine.