JPH0753932Y2 - Automatic nail supply device for continuous nailing machine - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] The present invention relates to a continuous hammering nailer,
The present invention relates to an automatic nail supply device that automatically supplies nails after a hammering operation of nails by continuous hammering.

[0002]

2. Description of the Related Art In a conventional continuous hammering type nailing machine, so-called additional hammering is performed in which one nail is continuously and repeatedly hammered to be completely hammered. In the additional hammering, the nail cannot be automatically supplied for each striking operation. Therefore, the nail is supplied by manually operating the nail supply lever every time the hammering operation of one nail is completed. ing. However, there are cases where it is not necessary to perform additional work for construction work such as wood. If a normal continuous hammering type nailing machine is used for these operations, the nail supply lever must be manually operated every time driving is finished, which has a drawback of impairing workability.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic nail supply device for a continuous hammering type nailing machine which automatically supplies nails at the time when a series of continuous hammering is completed.

[0004]

In order to achieve the above object, an automatic nail supply device for a continuous hammering type nailing machine according to the present invention is a trigger for starting a striking piston continuously and repeatedly by one manual operation. A valve, a feed piston / cylinder mechanism that engages with the connecting nails and supplies the nails one by one to the striking position, and a feed valve that operates by supplying and exhausting compressed air to and from the feed piston / cylinder mechanism. An on-off valve for communicating a part of the air passage when not in operation and cutting off the air passage on an air passage that connects the compressed air supply source for operating the feed valve and the feed valve; A supply valve that communicates at least a part of the valve from the operating end position to the initial position while being connected in series, and these opening / closing valve and supply valve The operation is performed by compressed air based on the operation of the trigger valve, and when the trigger valve moves from the operating end position to the initial position, the opening / closing valve and the supply valve are moved from the operating end position to the initial position, and the supply is performed. The valve is operated later than the on-off valve.

[0005]

According to the above construction, when the trigger valve is operated to move from the initial position to the operating end position,
At the same time that the trigger valve nailer is driven, the opening / closing valve and the supply valve are operated in conjunction with this, and the initial valve moves from the initial position to the operating end position. At this time, the on-off valve shuts off the air passage for operating the feed valve, so that the feed valve does not operate. Then, when the nail driving operation is completed and the trigger valve is moved from the operating end position to the initial position, the operation of the nailing machine is stopped and the opening / closing valve and the supply valve also move from the operating end position to the initial position. At this time, the open / close valve moves earlier to communicate the air passage for operating the feed valve. After that, the supply valve is actuated in a delayed manner, and the other part of the air passage is communicated during the actuation. Therefore, the air passage is in communication, the feed valve is activated, and the feed piston
The cylinder mechanism operates and nail feeding is performed.

As described above, the feed piston / cylinder mechanism automatically operates when the trigger valve shifts from the operating state for driving the nailing machine to the non-operating state.
In a continuous hammering type nailing machine, nails are automatically supplied at the time when a series of hammering by hammering is completed. Therefore, it is not necessary to manually feed the nails one by one, so that the working efficiency is remarkably improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an automatic nail supply device in a continuous hammering nailer driven by compressed air. The continuous hammering type nailing machine is designed to continuously and repeatedly drive a striking piston (not shown) by reciprocating motion based on a single manual operation of the trigger valve 1 for activation, and then stop. It is provided with a feed piston / cylinder mechanism 2 for supplying each to the striking position and a feed valve 3 for supplying / exhausting compressed air to / from the feed piston / cylinder mechanism 2.

The trigger valve 1 is configured such that one end of a valve stem 5 slidably accommodated in a valve cylinder 4 is projected to the outside, and a spring 6 biases the valve stem 5 in the direction in which the one end is projected. The protruding end 5a of the stem 5 is formed so as to be pushed in and operated by a manually operated trigger lever (not shown). At the operating end position, the air passages 7 and 8 leading to an on-off valve and a supply valve, which will be described later, are compressed air. It is configured to connect to the source 9 and selectively connect to the atmosphere in the initial position. A part of the air passage is connected to a head valve (not shown).
The head valve supplies compressed air to the striking piston / cylinder mechanism to drive the nail driving machine.

The feed piston / cylinder mechanism 2 slidably accommodates a feed piston 11 for supplying and driving a nail in the feed cylinder 10, and a feed nail (not shown) of a connecting nail is attached to the tip of the feed piston 11. By reciprocating the feed piston 11, the feed claws feed the nails of the connecting nails one by one to the striking position. An air passage 1 is provided in each of the front and rear portions of the feed cylinder 10.
2 and 13 are formed, the compressed air from the front air passage 12 is bulged portion 14 formed on the peripheral surface of the feed piston 11.
The compressed air from the rear air passage 13 acts on only the front end face of the feed piston 11, and acts on the rear end face of the feed piston 11. Normally, compressed air is supplied to the front and rear,
Since the rear end face has a larger effective area for receiving compressed air, the feed piston 11 is held at the forward position.

The feed valve 3 constantly feeds the compressed air supply source 15 to the front air passage 12 of the feed cylinder 10.
In addition to connecting the rear air passage 13 to the compressed air supply source 15 and the atmosphere by sliding the valve stem 30, the front air passage 12 is always connected to the compressed air supply source 15. Spring 16 to connect
It is biased in the backward direction by. Feed valve 3
Is operated by supplying compressed air from the compressed air supply source 15 to the bulging portion 30a on the spring 16 side, and the bulging portion 14 is connected to the air passage 17 communicating with the atmosphere at the operating end position. It opens and returns to the initial position again by the spring 16.

An opening / closing valve 19 and a supply valve 20 are arranged in series on an air passage 18 which connects the compressed air supply source 15 and the bulging portion 14 side of the feed valve 3. That is, the supply valve 2 is provided on the compressed air supply source 15 side.
An open / close valve 0 is arranged on the feed valve 3 side via the intermediate air passage 18b. Further, the opening / closing valve 19 and the supply valve 20 are connected to the valve stems 21 and 22 by supplying compressed air based on the operation of the trigger valve 1.
Is moved from the initial position to the operating end position, and the valve stem 2 is moved by the discharge of the compressed air and the elasticity of the springs 23 and 24.
1 and 22 are configured to return to their initial positions.

The supply valve 20 has a portion of the air passage at the ends of the valve stem 22 in the initial position and the operating end position.
That is, the openings of the air passages 18a and 18b are cut off during the movement from the operating end position to the initial position or from the initial position to the operating end position by shutting off between the compressed air supply source 15 side air passage 18a and the intermediate air passage 18b. Only when the end is opened between the seal portions 25 and 26 of the valve stem 22 is the air passage 18
It is set to communicate between a and 18b.

On the other hand, in the initial position, the opening / closing valve 19 makes a part of the air passage, that is, the intermediate air passage 18b and the feed valve 3 side air passage 18c communicate with each other.
The seal portion 27 of the valve stem 21 blocks the air passages 18b and 18c from each other at the operating end position.

In the supply valve 20 and the open / close valve 19, the air passage 8 connecting the supply valve 20 and the trigger valve 1 has a smaller diameter than the air passage 7 connecting the open / close valve 19 and the trigger valve 1. Is formed in. Therefore, the supply amount of the compressed air supplied through the trigger valve 1 per unit time is smaller in the supply valve 20 than in the opening / closing valve 19. Therefore, the operation of the supply valve 20 is delayed more than that of the opening / closing valve 19.

Here, an operation mode of the nail supply mechanism having the above-mentioned structure will be described. Prior to the operation of the trigger valve 1, each valve is in the state shown in FIG. 1, and the feed piston 11 of the feed piston / cylinder mechanism 2 is held at the forward position. Here, in order to activate the nail driver, the operator operates the trigger lever to move the valve stem of the trigger valve 1 to the position shown in FIG.
By pushing from the initial position to the operating end position as described above, the nailing machine is driven and the compressed air supply source 9 is opened to the air passages 7 and 8 which branch to the supply valve 20 and the opening / closing valve 19 and communicate with each other. Supply valve 20 and open / close valve 19
Is supplied with compressed air. By the way, since the air passage 8 communicating with the supply valve 20 has a smaller diameter than the air passage 7 communicating with the opening / closing valve 19, the valve stem 21 of the opening / closing valve 19 operates earlier. Therefore, among the air passages that connect the compressed air supply source 15 and the bulging portion 14 of the feed valve 3, the opening / closing valve 19 causes the intermediate air passage 18 to flow.
b and the feed valve side air passage 18c are cut off, and then the valve stem 22 of the supply valve 20 moves from the initial position to the operating end position. During the operation of the supply valve 20, the compressed air supply source side air passage 18a and the intermediate air passage 1
8b communicates with each other, but the feed valve 3 does not operate because the opening / closing valve 19 has already blocked the air passages 18b and 18c. Therefore, the nail supply device does not operate during the nail driving operation.

After that, when the nail driving operation is completed and the operator releases the operation of the trigger lever, the valve stem 5 of the trigger valve 1 is returned from the operating end position to the original initial position by the spring 6, as shown in FIG. The compressed air in the air passages 7 and 8 through the supply valve 20 and the opening / closing valve 19 is exhausted to the atmosphere. Also in this case, since the diameter of the air passage 8 communicating with the supply valve 20 is smaller than that of the air passage 7 communicating with the supply valve 20, the valve stem 21 of the opening / closing valve 19 moves faster to feed the intermediate air passage 18b and the feed air. The valve 3 side air passage 18c communicates with each other, and then the valve stem 22 of the supply valve 20 returns from the operating end position to the initial position. In the middle of the process, the compressed air supply source 15 side air passage 18a
And the intermediate air passage 18b communicate with each other, and the intermediate air passage 18b is disconnected again at the initial position. Therefore, compressed air is supplied to the feed valve 3 for a short time while the air passages 18a and 18b communicate with each other, and the valve stem 30 moves forward against the spring 16. However, since the air passages 18a and 18b are connected to the atmosphere at the working end as shown in FIG.
The valve stem 30 is retracted by the force of the spring 16.

By the way, as described above, the feed valve 3
When the valve stem 30 of FIG. 3 moves forward, air is exhausted from the rear air passage 13 of the feed cylinder 10 of the feed piston / cylinder mechanism 2 and compressed air is supplied from the front air passage 12 as shown in FIGS. Acting on the front end surface of the bulging portion 14 of the feed piston 11, so that the feed piston 11 retracts and engages with the connecting nail. next,
When the valve stem 30 of the feed valve 3 is retracted, compressed air from the compressed air supply source 15 is fed to the front and rear air passages 12, 1 of the feed cylinder 10, as shown in FIG.
3, the feed piston 11 returns to the advanced position again due to the difference in effective area, and supplies the nail to the striking position.

As described above, the above-mentioned automatic nail supply mechanism is essentially a valve of the feed valve 3 due to the opening operation of the supply valve 20 and the opening / closing valve 19 when the operation of the trigger valve 1 is released at the end of nail driving. The stem 30 is reciprocated, and the reciprocating movement causes the feed piston
The cylinder mechanism 2 is interlocked to automatically supply nails. In this way, the feed piston / cylinder mechanism 2 is automatically operated when the trigger valve 1 shifts the nailing machine from the driving state to the stopped state. The nails are automatically supplied at the time when is finished. Therefore, it is not necessary to manually feed the nails one by one, so that the working efficiency is remarkably improved.

In the above example, the supply valve 2
0 shuts off the compressed air supply source 15 side air passage 18a and the intermediate air passage 18b at the operating end position, but the supply valve 20 shuts off the air passage at the initial position and communicates at the operating end position. You may comprise. In this case, the compressed air supply source 15 and the feed valve 3 are connected from the time when the opening / closing valve 19 returns from the operating state to the non-operating state until the valve stem of the supply valve 20 moves from the initial position to the operating end position. Will be done.

[Brief description of drawings]

FIG. 1 is an explanatory view of a non-operating state of an automatic nail supply device for a continuous hammering nailer according to the present invention.

FIG. 2 is an operation state explanatory view of the automatic nail supply device when the trigger valve for starting the nail driving machine is operated.

FIG. 3 is an explanatory diagram of an operation state of the first half of the automatic nail supply device when the activation trigger valve is changed from an operation state to a non-operation state.

FIG. 4 is an operation state explanatory diagram of the latter half of the automatic nail supply device when the activation trigger valve shifts from an operating state to a non-operating state.

[Explanation of symbols]

 1 Trigger valve 2 Feed piston / cylinder mechanism 3 Feed valve 9 Compressed air supply source 15 Compressed air supply source 19 Open / close valve 20 Supply valve

Claims (1)

[Scope of utility model registration request] 1. A starting trigger valve for continuously and repeatedly driving an impact piston by reciprocating motion based on one manual operation, and a feed piston for engaging a connecting nail and supplying the nails one by one to an impact position. A cylinder mechanism and a feed valve that operates by supplying and exhausting compressed air to and from the feed piston / cylinder mechanism, and on an air passage that connects the compressed air supply source that operates the feed valve and the feed valve. And an opening / closing valve that communicates a part of the air passage when not operating and shuts off when the operation is performed, and a supply valve that communicates another part of the air passage at least during the movement from the operating end position to the initial position in series. The on-off valve and the supply valve are linked by compressed air based on the operation of the trigger valve. When the rigger valve moves from the operating end position to the initial position, the opening / closing valve and the supply valve are moved from the operating end position to the initial position, and the supply valve is operated later than the opening / closing valve. Nail feeder for automatic nailer.