JPH0753896Y2 - 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]

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 in conjunction with the operation of a contact arm which separates from the material to be driven at the end of nail driving by continuous hammering. To aim.

[0004]

In order to achieve the above object, an automatic nail supply device for a continuous hammering nailer according to the present invention is operated by engaging a manually operated trigger lever and a driven material. A trigger valve for actuation that continuously and repeatedly drives the striking piston in cooperation with the contact arm, a feed piston / cylinder mechanism that engages the connecting nails and supplies the nails to the striking position one by one, and the feed piston / cylinder mechanism. A feed valve that operates by supplying and exhausting compressed air to and from a cylinder mechanism, and an opening / closing valve and a contact valve on an air passage that connects the feed valve and the compressed air supply source that operates the feed valve. Are arranged so as to open and close the air passages, respectively, and the opening / closing valve is initially held by compressed air supplied when the trigger valve is not operated. A valve stem that blocks the air passage at a position and communicates at an operating end position, and the contact valve has a valve stem that is operated from an initial position to an operating end position in conjunction with operation of the contact arm, The valve stem connects between the opening / closing valve and the feed valve, and a first valve mechanism that shuts off the compressed air supply source and the opening / closing valve in the air passage at the initial position and communicates with each other at the operating end position. A second valve mechanism that shuts off at the initial position and the operating end position is provided, and the compressed air is supplied simultaneously while the valve stem in the first valve mechanism and the second valve mechanism returns from the operating end position to the initial position. It is characterized in that the source / open / close valve and the open / close valve / feed valve are connected.

[0005]

According to the above structure, the trigger valve for actuation is activated by the cooperation of the manual operation of the trigger lever and the operation of engaging the contact arm with the material to be driven, and the striking piston is continuously and repeatedly driven. To be done. in this case,
Along with the operation of the trigger valve, the valve stem of the opening / closing valve moves to the operation end position, thereby connecting the compressed air supply source and the air passage connecting the feed valve. Further, in the contact valve, the compressed air supply source and the air passage between the on-off valve are connected by the second valve mechanism. But,
The first valve mechanism closes the air passage between the on-off valve and the feed valve. After that, the trigger lever is manually operated to repeatedly drive the striking piston, and the opening / closing valve connects the air passage connecting the compressed air supply source and the feed valve. In this case, the open / close valve
Since the air passage between the feed valves is blocked, the feed valves do not operate.

After that, when the contact arm is released from the material to be bound, the valve stem of the contact valve is returned from the operating end position to the original initial position by the spring force.
At the same time, the compressed air supply source / open / close valve and the open / close valve / feed valve communicate with each other, so that the air passage from the compressed air supply source to the feed valve is fully communicated, so compressed air is supplied to the feed valve. The feed valve is actuated to supply and exhaust compressed air to the feed piston / cylinder mechanism, which is actuated to engage the connecting nail and the nail is supplied to the striking position. If the trigger valve is opened after the contact arm is opened, the trigger valve will also return to its initial position and the compressed air supply source
The air passage between the feed valves is cut off again.

As described above, according to the present invention, at the end of nail driving by continuous driving, the feed piston is automatically operated in conjunction with the operation of the contact arm which is separated from the material to be driven.
The cylinder mechanism is activated and nails are supplied. Therefore,
Since there is no need to manually feed the nails one by one,
Work efficiency is significantly improved.

[0008]

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 drive an impacting piston (not shown) based on the operation of the trigger valve 1 for activation, and then to stop it. The feed piston / cylinder mechanism 2 and the feed valve 3 for supplying / exhausting compressed air to / from the feed piston / cylinder mechanism 2 are provided.

The trigger valve 1 is a valve stem provided in a valve cylinder 6 in cooperation with a manual pulling operation of a trigger lever 4 and an engaging operation of a contact arm 5 with a material to be driven, as in a known nail driving machine. By pushing and sliding the protruding end of 7 against the spring 8, the compressed air supply source 9 is supplied to a head valve (not shown) to operate, thereby driving the striking piston. An air passage 11 communicating with an on-off valve 10 to be described later is connected to a compressed air supply source 9 when not in operation, and is connected to the atmosphere when operating. The contact arm 5 is configured so that a contact valve 12, which will be described later, can also be operated by engaging with the material to be driven.

The feed piston / cylinder mechanism 2 slidably accommodates a feed piston 14 for supplying and driving a nail in a feed cylinder 13, and a feed nail (not shown) of a connecting nail is attached to the tip of the feed piston 14. The reciprocating movement of the piston 14 causes the feed claws to feed the nails of the connecting nails one by one to the striking position. The feed cylinder 13
Air passages 15 and 16 are formed in the front and rear parts of the
Compressed air from the front air passage 15 is fed piston 1
The compressed air from the rear air passage 16 acts on the front end surface of the bulging portion 17 formed on the peripheral surface of the feed piston 14, and acts on the rear end surface of the feed piston 14. Normally, compressed air is supplied to the front and rear portions, and the rear end face has a larger effective area for receiving compressed air, so the feed piston 14 is held at the forward position.

The feed valve 3 constantly feeds the compressed air supply source 18 through the front air passage 15 of the feed cylinder 13.
And the rear air passage 16 is selectively connected to the compressed air supply source 18 and the atmosphere. The valve stem 20 always connects the front air passage 15 to the compressed air supply source 18. It is biased in the backward direction by the spring 21. The operation of the feed valve 3 in the forward direction is performed by supplying compressed air from the compressed air supply source 18 to the bulging portion 19 on the spring 21 side.

By the way, on the air passages 22a, 22b connecting the compressed air supply source 18 and the feed valve 3,
An opening / closing valve 10 and a contact valve 12 are arranged.

The opening / closing valve 10 has a valve stem 23 which is interlocked with the trigger valve 1, and the valve stem 23 comprises a large diameter portion 23a and a small diameter portion 23b. When the compressed air supplied from the compressed air supply source 9 via the non-actuated trigger valve 1 acts on the small diameter portion 23b and is pushed in against the spring 24, the When the seal portion 30 shuts off the air passages 22a and 22b and the compressed air is discharged based on the operation of the trigger valve 1, the valve stem 23 is caused by the spring 24 to move the air passages 22a and 22b.
It moves to the working end position where b is communicated.

The contact valve 12 moves from the initial position to the operation end position in conjunction with the operation of the contact arm 5 and returns by the force of the spring 27 to return to the valve stem 25.
The valve stem 25 has a first valve mechanism and a second valve mechanism. The first valve mechanism operates when the valve stem 25 is in the initial position.
This is a valve mechanism that shuts off the air passage 22a between the compressed air supply source and the on-off valve among a and 22b, and communicates when it is at the operating end position. The second valve mechanism is a valve mechanism that shuts off the on-off valve / feed valve air passage 22b when the valve stem 25 is at the initial position and the operating end position. Then, in the first valve mechanism and the second valve mechanism, the compressed air supply source / open / close valve air passage 22 is simultaneously opened while the valve stem 25 is returning from the operating end position to the initial position.
a and the air passage 22b between the on-off valve and the feed valve are communicated with each other.

Here, an operation mode of the nail supply mechanism having the above 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 14 of the feed piston / cylinder mechanism 2 is held at the forward position. Here, when the operator presses the contact arm 5 against the material to be stitched in order to activate the nail driver, the valve stem 25 of the contact valve 12 operates in conjunction with this, and as shown in FIG. The valve mechanism moves from the initial position to the operating end position, and the compressed air supply source / open / close valve air passage 22a communicates with each other. The air passage 22b between the on-off valve and the feed valve is shut off by the second valve mechanism. In the second valve mechanism, the air passage 22b between the on-off valve and the feed valve communicates with each other while the valve stem 25 moves from the initial position to the operating end position. However, since the air passages 22a and 22b are blocked by the opening / closing valve 10, the feed valve 3 does not operate.

When the trigger lever 4 is pulled to actuate the trigger valve 1 as shown in FIG. 3 following the operation of the contact arm 5, the nail driving machine is driven to drive the nail and the opening / closing valve 10 is communicated. Since the air passage is opened to the atmosphere, the valve stem 23 of the on-off valve 10 is moved from the initial position to the operating end position by the spring 24 in conjunction with this, and the compressed air supply source / feed valve air passage 22 is opened.
a and 22b communicate with each other. However, since the air passage 22b has already been shut off by the second valve mechanism of the contact valve 12, the feed valve 3 does not operate, but the first valve mechanism causes the compressed air supply source / open / close valve air passage 2 to flow.
Since it communicates with 2a, compressed air is supplied to the end of the large diameter portion 23a of the valve stem 23 of the on-off valve 10 to act.

After that, when the nail driving operation is completed and the operator releases the operation of the trigger lever 4, the valve stem 7 of the trigger valve 1 returns from the operating end position to the initial position as shown in FIG. The communicating air passage 11 communicates with the compressed air supply source 9, and compressed air is supplied to the end surface of the small diameter portion 23b of the valve stem of the opening / closing valve 10. However, at this stage, the large diameter portion 23 of the valve stem 23 is
Since the compressed air is also supplied to the end face of a, the opening / closing valve 10 does not move. Further, when the contact arm 5 is released from the material to be bound, the valve stem 25 of the contact valve 12 returns to its original initial position by the spring force. By the way, since the compressed air supply source 18 and the on-off valve 10 and the on-off valve 10 and the feed valve 3 communicate at the same time during the return movement as shown in FIG. Passage 22
a and 22b are all through. As a result, the compressed air is bulged 19 on the spring 21 side of the valve stem 20 of the feed valve 3.
The valve stem 20 is moved forward to the operating end position against the spring 21 to connect the rear air passage 16 to the atmosphere. At its operating end, the air passage 22b between the on-off valve and the feed valve is connected to the atmosphere as shown in FIG. 5, so that the valve stem 20 is again moved by the spring 21 to the initial position shown in FIG. When the air passage 22b between the on-off valve and the feed valve is discharged, the large-diameter portion 23a and the small-diameter portion 23 of the valve stem 23 of the on-off valve 10 are discharged.
The working pressure on both end faces of b is reversed, and the valve stem 23
Moves again to the initial position.

When the valve stem 20 of the feed valve 3 is moved forward, air is exhausted from the rear air passage 16 of the feed cylinder 13 of the feed piston / cylinder mechanism 2 and compressed air is supplied from the front air passage 15 to feed it. By acting on the front end surface of the bulging portion 17 of the piston 14, the feed piston 14 retracts and engages with the connecting nail. Next, when the valve stem 20 of the feed valve 3 is retracted, the compressed air from the compressed air supply source 18 is fed to the front and rear air passages 15 and 1 of the feed cylinder 13 as shown in FIG.
6, the feed piston 14 returns to the advanced position again due to the difference in effective area, and supplies the nail to the striking position.

According to the above-mentioned nail supply mechanism, the feed piston / cylinder mechanism 2 is automatically operated in association with the operation of the contact arm 5 which is separated from the material to be driven at the end of nail driving by continuous driving, and the nail is supplied. It in this way,
Since the feed piston / cylinder mechanism 2 automatically operates when the trigger valve 1 shifts the nailing machine from the driving state to the stopped state, in a continuous hammering type nailing machine, when a series of hammering is completed. Automatically supplies nails. Therefore, it is not necessary to manually feed the nails one by one, so that the working efficiency is remarkably improved.

In the above-mentioned example, the opening / closing valve 10 is provided with the air passages 22a, 22b between the compressed air supply source and the feed valve even after the trigger valve 1 is opened after the nail driving is completed.
The communication state of b is maintained. However, the communication of the air passage is accompanied by the opening operation of the contact arm 5 and the valve stem 25 of the contact valve 12.
Is performed during a short time during the return from the operating end position to the initial position, the valve stem 23 of the on-off valve 10 may be in communication with the air passage during this short time. Therefore, even if the valve stem 23 of the opening / closing valve 10 is moved back from the operating end position to the initial position in conjunction with the opening operation by the trigger valve 1,
If the operation procedure is such that the trigger valve 1 is opened after the contact arm 5 is opened, the air passage is opened before the valve stem 23 of the opening / closing valve 10 is moved back to shut off the air passages 22a and 22b. The full communication can be realized by communicating the air passage during the return movement of the valve stem 25 of the contact valve 12.

[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 diagram of the automatic nail supply device when a contact arm is operated in the automatic nail supply device.

FIG. 3 is an operation state explanatory diagram of the automatic nail supply device when the trigger valve for activation is operated after operating the contact arm in the automatic nail supply device.

FIG. 4 is an operation state explanatory diagram during movement of the contact arm valve when the operation of the trigger valve and the contact arm is released at the end of nail driving in the automatic nail supply device.

FIG. 5 is an operation mode explanatory diagram in a state where the contact valve is moved to an initial position in the automatic nail supply device.

[Explanation of symbols]

 1 Trigger valve 2 Feed piston / cylinder mechanism 3 Feed valve 4 Trigger lever 5 Contact arm 10 Open / close valve 12 Contact valve 20 Valve stem (of feed valve) 22a Compressed air source / open / close valve air passage 22b Open / close valve / feed valve air Passage 23 (Open / close valve) Valve stem 25 (Contact valve) Valve stem

Claims (1)

[Scope of utility model registration request] 1. A trigger valve for starting, which continuously and repeatedly drives a striking piston by cooperation of a manually operated trigger lever and a contact arm which is operated by engaging a driven material, and a connecting nail. Feed piston / cylinder mechanism for supplying nails to the striking position one by one, and compressed air to the feed piston / cylinder mechanism,
A feed valve for evacuating and operating, and an opening / closing valve and a contact valve for opening and closing the air passage on the air passage connecting the feed valve and the compressed air supply source for operating the feed valve, respectively. The opening / closing valve has a valve stem that interlocks with the trigger valve to block the air passage at an initial position and communicate with the operating end position, and the contact valve initially operates in conjunction with an operation of the contact arm. A valve stem that is operated from a position to an operating end position, the valve stem blocking the compressed air supply source and the on-off valve in the air passage at an initial position and allowing communication at the operating end position; Second valve machine for shutting off the valve mechanism between the opening / closing valve and the feed valve at an initial position and an operating end position In the first valve mechanism and the second valve mechanism, the compressed air supply source / open / close valve and the open / close valve / feed valve are simultaneously opened while the valve stem is returning from the operating end position to the initial position. Automatic nail supply device for continuous hammering type nailing machine, which is characterized by communicating.