JP2819969B2 - Driving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving machine for driving a fastener using compressed air as a power source.

[0002]

2. Description of the Related Art A conventional driving machine will be described with reference to FIGS.
I will tell. Incidentally, FIGS. 8 to 11 the actual fair 01-18294
FIG. 2 is an enlarged sectional view of a main part showing a switching mechanism of a driving mode in a nailing machine disclosed in Japanese Patent Application Laid-Open Publication No. 58-50833 and a trigger structure having an amplification valve disclosed in Japanese Patent Publication No. 58-50833.
The driving machine having the trigger structure shown in FIGS.
By operating the lever 22 , a single shot or
It is possible to select whether or not to perform a repeated hit.

[0003] As shown in FIG .
To control the main valve 6 that operates the
To the main valve chamber 7 for operating the main valve 6.
The intake valve 13 for supplying compressed air and the exhaust to the atmosphere are performed.
A valve piston 11 having an exhaust valve 14;
A valve piston chamber 15 for operating the stone 11 and a valve
Inlet plan for supplying compressed air to bupiston chamber 15
Exhaust plunger valve 1 for exhausting to jaw valve 17 and atmosphere
8 comprises a plunger 12.

FIG . 8 shows that the plunger 12 is not operated.
In this state, the air supply plan of the plunger 12 is shown.
The jaw valve 17 is open and the exhaust plunger valve 18 is closed.
You. When the intake plunger valve 17 is open, the valve
The compressed air is supplied to the valve piston chamber 15 and the valve piston
11 rises to open the intake valve 13 and close the exhaust valve 14
Be in a state. Then, from the intake valve 13 to the main valve chamber 7
When compressed air is supplied, the main valve 6
Stone 3 does not operate, that is, does not drive.

Next, FIG. 9 shows a state in which a single shot is performed.
The operation state of the amplification valve 10 at the time of driving will be described.
The plunger 12 shown in the figure was completely pushed up.
In state. Plunger 12 is pushed up and air intake plan
When the plunger valve 17 is closed and the exhaust plunger valve 18 is opened,
When the compressed air is no longer supplied to the piston piston chamber 15,
The compressed air in the valve piston chamber 15 is an exhaust plunger valve.
Emitted from 18 to the atmosphere, the valve piston 11 descends
You. When the valve piston 11 descends, the intake valve 13 closes
The exhaust valve 14 opens, and the compressed air in the main valve chamber 7 is exhausted.
The main valve 6 is discharged to the atmosphere from the valve 14 and rises.
The piston 3 in the cylinder 4 descends rapidly and drives.

FIG. 9 shows a single-shot driving mode.
Shows the state of the amplification valve 10 when it is driven
FIG. 11 shows the state of the trigger portion when the user hits the gun repeatedly.
It shows the state . Set the driving mode to continuous firing
With the trigger 19 pulled, the push lever 21 is
If you press the material multiple times,
Driving is performed as many times as the push lever 21 moves up and down.
U. On the other hand, if you make a single shot, push lever 2
No matter how many times 1 is pressed against the material to be driven,
Do not do. Switching of the driving mode is at the top of the trigger 19.
It is performed by operating the switching lever 22 provided,
As can be seen from FIGS. 9 and 11, the switching lever 22 is rotated.
To change the range that the trigger 19 can pull,
Amplifying valve by changing the amount of plunger 12 pushed up
10 operates to perform a single shot or a repeated shot.
You.

FIG . 10 shows the end of the single-shot driving shown in FIG.
When the push lever 21 separates from
Shows a state in which the shrewder 21 and the plunger 12 are lowered.
You. As shown in the figure, the push lever 21 is
Even if it is lowered, the plunger valve 17 of the plunger 12
Is closed, so the valve piston chamber 15
The compressed air is not supplied and the valve piston 11 is lowered.
State, that is, the piston 3 remains in the lowered state.
Therefore, the trigger 19 is returned to the initial state as shown in FIG.
Without that, you can't do it again. At the time of driving
The main body is lifted by the recoil and the push lever 21 is lowered.
As a result, the push lever 21 again hits the material to be driven.
Do not hit even if you hit it twice
Has the effect of stopping. In the case of repeated hits against single hits, birds
Push lever 21 descends with mower 19 pulled
And the plunger valve 17 of the plunger 12 is open.
And the valve piston
Compressed air is supplied to the chamber 15 and the valve piston 11 rises
Then the main valve 6 moves down and the piston 3 moves as shown in FIG.
To the initial position and push lever 21 is pushed up again
If you can, start driving. That is, the trigger 19 is pulled.
Push the lever 21 against the material to be driven
In this case, it is possible to perform continuous driving.

[0008]

In THE INVENTION It is an object to be solved amplification valve 10 of the fastener driving tool of come slave described above were implanted mode single-handed
Also, push the push lever 21 against the material to be driven.
When triggering the trigger 19 from the
If you do not pull relatively fast, you can not prevent hitting twice
There was a disadvantage that. Use the above drawbacks in Figs.
And will be described in detail. With the driving machine of the above configuration
Trigger 1 after pushing the push lever 21 against the driving material
When trying to drive in 9 as shown in FIG.
Before the trigger 19 is completely pulled, the air plunge
The valve 17 is closed and the exhaust plunger valve 18 is opened.
Stone 11 descends and piston 3 starts driving.
I will. At this time, the trigger 19 is pulled slowly.
As shown in FIG. 13, the trigger 19 is still completed after the driving.
When not fully pulled, the main body is
The lift push lever 21 is lowered. this
Push lever before trigger 19 is fully pulled
When 21 goes down, the intake plunger valve that was closed
17 opens, the valve piston 11 rises and the main valve
6 descends and enters the standby state for driving.
The push lever 21 that is separated from the material to be driven
If it hits the jamming material, the second stopper is driven.

An object of the present invention is to eliminate the above-mentioned disadvantages,
An object of the present invention is to provide a driving machine which can reduce the recoil of the main body at the time of driving the stopper of the driving machine, and further can prevent double hitting of the stopper caused by the recoil of the driving due to the difference in the pulling speed of the trigger.

[0010]

An object of the present invention is to provide an air intake plan.
Make the diameter of the jaw valve smaller than the diameter of the exhaust plunger valve and
The pressure of compressed air is achieved by reducing the pressure receiving area.

[0011]

[Action] As described above, the pressure receiving area of the intake plunger valve is exhausted.
By be Rukoto smaller than air plunger valve, the load trigger pushes up the plunger through the contact arm
However , it is lighter when the exhaust plunger valve is open and the intake plunger valve is closed than when the exhaust plunger valve is closed. Even if the minus Therefore slowly the trigger, if it is Hikitsuzuke at the same load, open the exhaust plunger valve, lighter load pull at the moment when the intake air plunger valve is closed, early speed to pull the trigger naturally that Do not. In addition, when the driving mode is continuous firing, the plunger is pushed up by pressing the push lever from a state where the trigger is pulled, and the load is reduced at the moment when the intake plunger valve is closed and the exhaust plunger valve is opened, so that the operation is performed. pressing load for the Ru reduction.

[0012]

EXAMPLES be described with reference to the drawings an embodiment of the following invention driving machine. In FIG. 1, a cylindrical cylinder 4 is provided in a driving machine body 1, and a piston 3 is provided in the cylinder 4 so as to be slidable up and down. A main valve 6 is provided at the upper end of the cylinder 4. The upper end of the cylinder 4 opens and the exhaust port 2 closes when the main valve 6 rises, and the upper end of the cylinder 4 closes and the exhaust port 2 opens when the main valve 6 lowers. The main valve chamber 7 is connected to the amplification valve 1 through a passage 8.
The main valve 6 rises by exhausting the compressed air in the main valve chamber 7 through the amplification valve 10, and the main valve 6 is supplied by supplying the compressed air into the main valve chamber 7. Descend. On the other hand, the amplification valve 10 is provided with a valve piston 11 having an intake valve 13 and an exhaust valve 14 for introducing and exhausting compressed air into and from the main valve chamber 7 so as to be movable up and down. The air valve 13 opens and the exhaust valve 14 closes, and the lowering of the valve piston 11 closes the inlet valve 13 and opens the exhaust valve 14. The lower end of the valve piston 11 is slidably disposed in the valve piston chamber 15. By exhausting the compressed air in the valve piston chamber 15, the valve piston 11 descends, and the compressed air is discharged into the valve piston chamber 15. The supply causes the valve piston 11 to rise. In the valve piston chamber 15, the valve piston chamber 1 is provided.
Inlet plunger valve 1 for injecting and exhausting compressed air into chamber 5
7. A plunger 12 having an exhaust plunger valve 18 is provided. The exhaust plunger valve 18 is provided with an O-ring groove on the plunger 12 side in the same manner as in the related art, and an O-ring is provided.
Seal around the circumference of the ring. The inlet plunger valve 17 is
An O-ring 23 is arranged on the inner periphery of the valve piston 11 side,
Sealing is performed between the inner periphery of the O-ring 23 and the outer periphery of the small-diameter shaft portion 12a of the plunger 12. The above-mentioned valve receives a load in the area of the seal portion slid or fixed by the pressure of the compressed air, and the area receiving this load is referred to as a pressure receiving area. As described above, the pressure receiving area of the intake plunger valve 17 receiving pressure becomes smaller than that of the exhaust plunger valve 18 by about １ ／,
The load for operating the plunger 12 is reduced. But,
The pressure receiving area of the exhaust plunger valve 18 is the same as that of the conventional structure, and the load at the start of pushing the plunger 12 is the same as that of the conventional structure.

The structure of the intake plunger valve 17 will be described in more detail with reference to FIG. The O-ring groove on the inner circumference of the valve piston 11 can be formed on the inner circumference from the side opposite to the valve piston chamber 15, so that the O-ring can be formed without lowering the workability and without particularly increasing the number of parts. A groove is formed. The inner diameter D of the valve piston 11 is
Since the plunger 12 is wider than the inner diameter d side on which the plunger 12 operates, the O-ring 23 can be easily incorporated from the rear of the valve piston 11.
Since a force is applied downwardly of the O-ring 23,
The ring 23 does not come off. Plunger 12
The small-diameter shaft portion 12a is provided with an intake plunger valve 17 having a conventional structure.
Since the outer diameter of the O-ring groove is substantially equal to the outer diameter of the O-ring groove, the strength and the like do not decrease.

Since the small-diameter shaft portion 12a of the plunger 12 and the inner diameter d of the valve piston 11 are always fitted with a predetermined gap, the compressed air from the pressure accumulating chamber 5 into the valve piston chamber 15 is formed. Is controlled to be filled over a certain period of time. Therefore, the amplification valve 10 is in a half-valve state, the main valve 6 is opened only momentarily, and the delay is made so that the piston 3 does not return poorly. Further, the plunger 12 is configured to be operated by being pushed by the trigger 19 and the contact lever 20,
The positional relationship is such that when neither the trigger 19 nor the push lever 21 is operated, the intake plunger valve 17 is open and the exhaust plunger valve 18 is in the closed state. 1
7 is set to be closed, and the exhaust plunger valve 18 is set to be open. The driving machine body 1 has a single-shot, continuous-fire switching lever 2
The position where the plunger 12 is lowered can be arbitrarily selected by changing the open position of the contact arm 20. Thus, single-shot the driving mode
In the state where the plunger 12 is set to be driven, even if the push lever 21 is lowered after the driving operation, the plunger 12 is not completely lowered by the contact lever 20. Therefore, the intake plunger valve 17 is set to be closed and the exhaust plunger valve 18 is set to be open, which is the same as the conventional structure.

Next, the operation of the above structure will be described. When the switching lever 22 is in the single-shot operation mode as shown in FIG. 3 and the push lever 21 is pressed against the material to be driven (not shown) and the trigger 19 is pulled, the plunger 12 is pushed up by the contact arm 20, and the intake plunger valve is opened. 17
Is closed and the exhaust plunger valve 18 is opened at the same time. At this time, the trigger 19 is not completely pulled out to the main body 1. Thereafter, the compressed air in the valve piston chamber 15
The gas is exhausted from the exhaust plunger valve 18, the pressure in the valve piston chamber 15 decreases, and the valve piston 11 descends.
Accordingly, the intake valve 13 closes and the exhaust valve 14 opens, so that the compressed air in the main valve chamber 7 is exhausted, the main valve 6 rises, the compressed air flows into the cylinder 4 and the piston in the cylinder 4 3 performs a driving operation. At this time,
Even when the trigger 19 is pulled relatively slowly, the pulling load is reduced to almost half when the exhaust plunger valve 18 opens and the intake plunger valve 17 closes from the load at the start of pulling. About twice as fast. Therefore, as shown in FIG. 3, even if the main body 1 rises due to recoil or the like and the push lever 21 is lowered, the trigger 19 is naturally pulled quickly to the main body 1, so that the inlet plunger valve 17 of the plunger 12 is closed and the exhaust plunger valve is closed. When the main valve chamber 7 is in the exhausted state at this time, no compressed air flows in or out of the passage 8 and no compressed air is supplied into the valve piston chamber 15 and the piston 3 descends. The state is maintained. Therefore, even if the push lever 21 hits the material to be driven by the recoil again, the normal single operation mode is set, and the second stopper is not driven.

Next, when the trigger 19 is released in this state, the plunger 12 is lowered to the position where the intake plunger valve 17 is opened, so that compressed air is supplied into the valve piston chamber 15 as shown in FIG. Rise and exhaust valve 1
4 is closed and the intake valve 13 is opened. Therefore, the compressed air flows into the main valve chamber 7, the main valve 6 is lowered, the piston 3 returns to the original position, and one cycle of the driving stroke is completed.

When the switching lever 22 is hit repeatedly,
When the push lever 21 is pressed against the workpiece while the trigger 19 is pulled, the plunger 12 is pushed up by the contact arm 20. The plunger 12 is pushed up,
At the moment when the intake plunger valve 17 is closed and the exhaust plunger 18 is opened, the load for pushing up the plunger 12 becomes smaller than the load up to that time. Therefore, the main body 1 moves toward the material to be driven by the load of the hand that is continuously pressed for the driving operation toward the material to be driven. Therefore, since the main body 1 moves to the material to be driven at the same time as the reaction due to the driving operation of the piston 3, the reaction of driving is reduced for the operator.

FIG. 7 shows another embodiment of the present invention. The embodiment shown in FIG. 7 is different from the above-described embodiment in that the switching lever 22
Structure different as shall der of is, in Rukoto changing the engagement position of the end of the rotated <br/> contact lever 20 a switching lever 22
Single-handed the driving mode, the switching obtain structure to volley strike
It is a thing .

[0019]

According to the present invention, the driving machine having an amplification valve, implanted mode to single-handed, et al or by placing the tip of the push lever to the nailed object, can relatively slowly pull the trigger implantation even if you perform, trigger pull load
Is reduced to about half or less at the moment when the main body starts the driving operation, rather than the start of pulling, so that if the player pulls with the same force, the player naturally pulls at twice or more the speed. Thus,-out slowly pull the trigger, the body is increased float in the rebound of hammering only,
If the push lever hits the material to be driven again
Also , the body rises due to the recoil of the driving, and the push lever
Trigger will be fully pulled before falling
Therefore, there is no possibility of accidentally driving out two fasteners on the material to be driven.
Further, the barrage beating, when driving the fastener against the push lever from the state of pulling the trigger, since the load of the hammering operation simultaneously with the pressing operation of the piston is reduced, small hammering reaction to operator that Do not.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is an enlarged view showing a valve piston section of FIG. 1;

Operation theory Akirazu of FIG. 3] FIG. 1.

Operation theory Akirazu of FIG. 1;

Operation theory Akirazu of FIG. 5] FIG. 1.

[6] The operation theory Akirazu of Figure 1.

FIG. 7 is an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part showing an example of a conventional driving machine.

Operation theory Akirazu of FIG. 8;

The main section behavior theory Akirazu of FIG. 10] FIG. 8.

[11] The main section behavior theory Akirazu of Figure 8.

The main section behavior theory Akirazu of FIG. 12] FIG. 8.

[13] The main section behavior theory Akirazu of Figure 8.

[Explanation of symbols]

3 is a piston, 4 is a cylinder, 5 is a pressure accumulation chamber, 6 is a main valve, 7 is a main valve chamber, 10 is an amplification valve, 11
Is a valve piston, 12 is a plunger, 12a is a small-diameter shaft portion, 13 is an intake valve, 14 is an exhaust valve, 15 is a valve piston chamber, 17 is an intake plunger valve, 18 is an exhaust plunger valve, 22 is a switching lever, 23 is an O-ring.

Claims (1)

(57) [Claims] 1. A and accumulator for storing compressed air, a piston mounted for reciprocation within the cylindrical cylinder, sheet re <br/> compressed air in 蓄 chamber supply and atmosphere in the Sunda a main valve for alternately operating to exhaust, the accommodating portion of the main valve, a main valve chamber to operate the main valve by entering the exhaust of the compressed air, to control the inlet exhaust of compressed air to main-valve chamber and a amplification valve, is amplified valve and valve piston having an exhaust valve for exhausting to the intake air valve and the air to supply the compressed air to the main-valve chamber, into the interior housing a first end of the valve piston Yusuke of the valve piston chamber to operate the by Riva Rubupisuton the inlet exhaust of the compressed air, an exhaust plunger valve to perform exhaust to intake air plunger valve for supplying compressed air to the valve piston chamber and the atmosphere Consists plunger, by pushing up the plunger, closes inlet air plunger valve, opens the exhaust plunger valves, exhaust the compressed air Bas Rubupisuton chamber, further the main valve is increased by evacuating the compressed air of the main valve chamber and to drive the piston a driving machine for driving the fastener, before entry to the diameter reduced to the pressure of the compressed air than the diameter of the gas-plunger valve exhaust plunger valve is reduced such pressure receiving area A driving machine characterized by the following.