JPH0727088Y2 - Nail supply device for nailer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nail supply device for a nailing machine.

[0002]

2. Description of the Related Art In a conventional nailing machine (a nailing machine that completes driving a nail by a single impact), the air used to return the impact piston after the impact stroke to the initial position is used. Equipped with a return air chamber that accumulates pressure during the striking stroke, and an automatic nail supply system that uses the air pressure in this chamber to drive the feed piston / cylinder mechanism that supplies nails in synchronization with the driving operation is adopted. ing. Such a single-striking nail driving machine requires a large amount of power for one striking, and thus has a problem that the machine becomes large.

On the other hand, in a nailing machine of a continuous hammering type in which one nail is hammered multiple times to hammer the nail, since the hammering power per hammering is small, a relatively small machine is used. Can be used to drive long-sized nails or to drive hard materials such as concrete. However, in this type of continuous hammering type nailing machine, compressed air is supplied to the return air chamber after every multiple strokes in order to raise and return the piston. Cannot be adopted. Therefore, in this type of nail driving machine, a feed piston / cylinder mechanism for supplying the nail is provided so that the head can project again from a nail that is not properly driven, which is protruding from the surface of the material to be driven. A nail supply device that is operated by operating a lever is used. However, in the usual case, the lever is arranged on the left side surface in the vicinity of the trigger lever that activates the nail driver, and is configured to be able to be pushed by the thumb of the right hand holding the grip. For this reason, the nail feeding operation is very troublesome for a left-handed worker.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nail supply device for a nailing machine, which can supply a nail by operating a trigger lever for activating the nailing machine.

[0005]

To achieve the above object, a nail supply device in a nailing machine according to the present invention comprises a feed piston / cylinder mechanism for supplying and driving a nail, and a compression for operating the nail supply device. A nailing machine comprising a feed valve for supplying and discharging air, a trigger lever for starting a nailing machine by a manual operation, and a contact arm operated by contact with a material to be driven, the trigger lever comprising: A nail feed valve for activating the feed valve is provided in the vicinity of the operation locus, and an operating lever for activating a valve stem of the nail feed valve is provided on the trigger lever, and the operating lever is provided when the trigger lever is activated. Engages with the valve stem, and rotates to a position that engages with the contact arm and does not engage with the valve stem during nailing operation. Characterized in that it is arranged in ability.

[0006]

According to the above structure, when the trigger lever is operated without pressing the contact arm against the material to be driven during nail feeding, the operating lever engages with the valve stem of the nail feeding valve. As the nail feed valve operates, the feed valve and feed piston
The cylinder mechanism operates and nail feeding is performed.

On the other hand, when operating the nail driving machine, the contact arm is first pressed against the material to be driven. The contact arm is engaged with the operating lever and rotated to a position not engaged with the valve stem of the nail feed valve. Then, by pulling the trigger lever, the nail driver is driven into the nail, but the nail feed valve is not activated, so that the nail feed operation is not performed.

As described above, according to the present invention, since the nail can be fed only by operating the trigger lever for starting the nail driver, even if the operator is left-handed, it can be easily operated. Further, the nail driving operation can be repeated any number of times.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 (a) and 1 (b) are explanatory views of a nail supply device and its operating mode in a continuous hammering type nailer driven by compressed air. is there.

Reference numeral 1 indicates a nail supply mechanism. This nail supply mechanism 1 connects a feed piston / cylinder mechanism which slidably accommodates a feed piston 3 for supplying and driving a nail in a feed cylinder 2 with a connecting nail feed means (not shown), The reciprocating movement of 3 causes the feeding means to feed the nails of the connecting nails one by one to the injection port of the nailing machine. Air passages 7 and 8 are formed in the front and rear portions of the feed cylinder 2, and the compressed air from the front air passage 7 acts only on the front end surface of the bulging portion 9 formed on the peripheral surface of the feed piston 3. The compressed air from the rear air passage 8 is configured to act on the rear end surface 10 of the feed piston 3. Supply and discharge of compressed air for operation to the feed piston / cylinder mechanism is performed by the feed valve 4.
Done by.

The feed valve 4 constantly connects the front air passage 7 of the feed cylinder 2 to the compressed air supply source 11, and selectively connects the rear air passage 8 to the compressed air supply source 11 and the atmosphere. The spring 12 is always urged to connect the rear air passage 8 to the compressed air supply source 11. The feed valve 4 is operated in the reverse direction by the compressed air supplied from the pilot valve 13 through the air passage 14, and the compressed air is supplied by the nail feed connected to the pilot valve 13. It is controlled by the valve 16.

The pilot valve 13 is a feed valve 4
The air passage 14 communicating with the compressed air supply source 15 or the atmosphere 16 is selectively connected, and one end is connected to the compressed air supply source 15 and the other end is connected to the nail feed valve 17. A valve stem 20 having a through hole 19 therein is slidably accommodated. Also, the valve stem 2
The end surface of the No. 0 nail feed valve 17 side is formed to have a larger area than the opposite end surface.

The nail feed valve 17 slides a valve stem 23 provided in a valve cylinder 22 so that the air passage 21 communicates with the other end of the pilot valve 13.
Is to open and close to the atmosphere.
Is provided in the vicinity of the operation locus, and the one end 23a of the valve stem 23 projects outward due to the elasticity of the spring 24. An exhaust hole 22a is formed in the valve cylinder 22.

The operation mode of the nail supply mechanism 1 having the above-mentioned structure will be described below. Before the operation of the nail feed valve 17, each valve is in the state shown in FIG. 1 (a). Therefore, by pushing the protruding end 23a of the valve stem 23 of the nail feed valve 17 when the nailer is operated as shown in FIG. 2B, the air passage 21 communicating with the pilot valve 13 is opened to the atmosphere through the exhaust hole 22a. One end of the pilot valve 13 is rapidly depressurized to operate, the compressed air supply source 15 and the air passage 14 are opened, and compressed air is supplied to the feed valve 4. As a result, the rear air passage 8 of the feed valve 4 is connected to the atmosphere. For this reason, the air pressure acting on the rear end surface of the feed piston 3 of the feed piston / cylinder mechanism is rapidly reduced, and the feed piston 3 operates rearward. After that, when the pressing operation of the nail feed valve 17 against the valve stem 23 is released, the valve stem 23 is returned to the original position by the force of the spring 24 as shown in FIG. 1, and similarly, from the one end of the pilot valve 13. Since the exhaust is stopped, the compressed air from the compressed air supply source 16 is supplied to both sides of the valve stem 20 through the through holes 19, and the valve stem 20 also returns to its original position due to the difference in pressure receiving area at both ends thereof. Therefore, the air passage 1 communicating with the feed valve 4
4 is exhausted and the feed valve 4 is moved to its original position by the force of the spring 12, so that the feed piston
Compressed air is supplied to the air passages 7 and 8 at the front and rear of the cylinder mechanism, and the feed piston 3 is operated forward due to the difference in pressure receiving area, whereby nail feeding is performed. Similarly, nail feeding is continued by repeating the operation mode of FIGS. 1 (a) and 1 (b).

As described above, the nail supply mechanism 1 is controlled by the operation of the nail feed valve 17, and the operation of the nail feed valve 17 is performed by the trigger lever 5 for starting the nail driver. The trigger lever 5 is mounted by a manual operation so as to move in parallel with the operating direction of the valve stem 23 of the nail feed valve 17, and cooperates with the contact arm 6 pressed against the material to be driven to start the nail driving machine. A trigger valve (not shown) is operated to operate. As shown in FIG. 1 (a), an operation lever 25 for operating the nail feed valve 17 is pivotally supported on the side surface thereof. Operating lever 2
5 is a rotation stopper 26 formed on the trigger lever 5,
The nail feed valve 1 protruding at a right angle from the trigger lever 5
The valve stem 23 is held at a position facing the protruding end of the valve stem 23 and engaged with the valve stem 23, and is rotatably supported at a position not engaged with the valve stem 23.

Further, one end (not shown) of the contact arm 6 is arranged so as to project from the tip of the injection port of the nailing machine, and the other end 6a is arranged so as to face the operation lever 25 from the side opposite to the nail feed valve 17. When the one end is pressed against the material to be driven, the one end moves relative to the nailing machine to enable the operation of the trigger valve by the trigger lever 5, and the other end engages the operation lever 25. In combination, the nail feed valve 17 is configured to rotate to a position where it does not engage with the valve stem 23.

In the above structure, when the nail is sent to the injection port of the nail driving machine before (or after) the nail driving operation, the contact lever 6 is not pressed against the driven material and the trigger lever 5 is operated. Operate pulling and releasing. As a result, the operating lever 25 engages with and releases the protruding end 23a of the valve stem 23 of the nail feed valve 17, so that the nail feed valve 17 operates and the feed piston
The cylinder mechanism operates and nail feeding is performed.

Next, when operating the nail driving machine, the contact arm 6 is first pressed against the material to be driven. The contact arm 6 moves relative to the nail driver, and the other end 6a pushes the operation lever 25 as shown in FIG. 2 to rotate it to a position where it does not engage with the valve stem 23 of the nail feed valve 17. After that, by pulling the trigger lever 5, the nail driving machine is driven into the nail, but the nail feeding valve 17 does not operate, so that the nail feeding operation is not performed. Therefore, it is also possible to repeatedly strike a nail that has been improperly driven by the first consecutive stroke.

As described above, according to the nail supply mechanism 1, the nail can be fed only by operating the trigger lever 5 for starting the nail driver, so that the operator can easily operate even if the operator is left-handed. You can Further, the nail driving operation can be repeated any number of times.

[Brief description of drawings]

1 (a) and 1 (b) are explanatory views of an operation mode of a nail supply device according to the present invention.

FIG. 2 is a diagram illustrating an operation mode of a trigger lever.

[Explanation of symbols]

 1 Nail supply mechanism 3 Trigger lever 4 Feed valve 5 Trigger lever 6 Contact arm 17 Nail feed valve 25 Operation lever

Claims (1)

[Scope of utility model registration request] 1. A feed piston / cylinder mechanism for supplying and driving a nail, a feed valve for supplying and discharging compressed air for operation to the nail supply device, a trigger lever for activating a nailing machine by a manual operation, and a driven object. A nailing machine provided with a contact arm operated by contact with an insert material, wherein a nail feed valve for operating the feed valve is provided in the vicinity of an operation locus of the trigger lever, and the trigger lever is provided. An operation lever for operating the valve stem of the nail feed valve is provided, and the operation lever engages with the valve stem when the trigger lever is operated,
A nail supply device for a nailing machine, which is rotatably arranged at a position that engages with the contact arm and does not engage with the valve stem during a nail driving operation.