JP2000158360A - Pound type fixture driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism of stopping the drive in automatically when the drive in suitable for a continuous hit type stick tool drive in machine utilizing a pressurized air is finished. SOLUTION: A valve piston 26 is constituted so as to move to the trigger rest position of a projection position at the non-action time, the trigger action position pushed in from the rest position at the action time and further the pushed in trigger passage 29 seal position and in this trigger passage seal position, the valve piston 26 obstructs the communication of the trigger passage 29 to the atmosphere and supplies a pressurized air to a main valve chamber 21 and the main valve 19 is returned back to the rest position. A drive in action stop arm 35 extending movably so as to contact the trip lever 53 of the trigger device is provided in a nose and the drive in action stop arm is moved while interlocking with the drive in of a stick tool to an object by a prescribed depth and the valve piston is pushed into the trigger passage seal position through the trip lever 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener driving machine for automatically stopping a fastener driving operation upon completion of driving, and more particularly to a fastener such as a nail from the tip of a nose. Use the pressurized air to insert and support each time, operate the trigger to reciprocate the driving member connected to the piston many times, and hit the head of the fixing tool continuously while hitting it multiple times. The present invention relates to an automatic stop mechanism suitable for a continuous hitting type fastener driving machine when a fastener driving is completed.

[0002]

2. Description of the Related Art A fastener such as a nail is inserted and supported one by one from the tip of a nose, a trigger is operated, and a driving member connected to a piston is reciprocated a number of times. There is known a continuous-strike type fastener driving machine using pressurized air, which strikes while continuously hitting a plurality of times. For example, Japanese Patent Publication No. 48-12913 discloses an early-type continuous nailing machine. Japanese Unexamined Patent Publication No. Hei 9-131669 discloses a continuous nailing machine designed to make the configuration as simple as possible and to reduce the time required for assembly. Further, JP-A-9-300237 discloses that
There has been disclosed a continuous hitting nailing machine incorporating a device for stabilizing a continuous hitting speed.

[0003]

The continuous hitting nailer described in the above publication has been improved in various aspects, but there is still room for improvement. One of them required experience and can to know the completion of the nailing, and sometimes the nailing continued even after the completion of the driving. When such excessive driving is performed, a dent is left on an object such as a pillar, and the finish is deteriorated. In addition, since the driving is continued even after the completion of the driving, the pressurized air is wastefully consumed, an extra load is imposed on the compressor, and further, the driving operation takes extra time.

Accordingly, an object of the present invention is to provide a continuous driving type fastener driving machine which can be automatically stopped by the completion of the driving of the fastener driving machine, and in particular, utilizes pressurized air. It is an object of the present invention to provide a mechanism for automatically stopping a driving when a driving is completed in a continuous driving type fastener driving machine.

[0005]

In order to achieve the above object, a fastener driving machine according to claim 1 is disposed so as to reciprocate in a main cylinder and the main cylinder, and is held at a tip of a nose. A main piston to which a driving member for hitting the fastener is connected, a stationary position for preventing the supply of pressurized air from the reservoir to the main cylinder, and a firing for supplying pressurized air from the reservoir to the upper surface of the main piston from above the main cylinder. A main valve that moves between positions, and a trigger that selectively supplies or exhausts pressurized air to control the position of the main valve by controlling the supply and exhaust of pressurized air to and from the main valve chamber on the top of the main valve. A trigger valve with an extended passage, and when the trigger valve is operated, the main piston is reciprocated a plurality of times to fix the fastener at the tip of the nose to the driving member. And a main piston control means for driving the object while continuously hitting the object, wherein the trigger valve includes a valve cylinder and a valve piston reciprocating in the valve cylinder. During non-operation, pressurized air of the reservoir is supplied into the valve cylinder to maintain the valve piston at the trigger protruding position at the most protruding position and to send out pressurized air through the trigger passage to hold the main valve at the static position. And
In operation, the valve piston is stopped by the trigger rest position so as to stop sending the pressurized air to the trigger passage and to communicate the trigger passage to the atmosphere by the valve piston pressing means. Further, the valve piston is configured to be movable from the trigger operation position to a further pushed trigger passage sealing position, and in the trigger passage sealing position, the valve piston makes the trigger passage communicate with the atmosphere. The main valve chamber is supplied with pressurized air to return the main valve to the rest position, and the nose has one end extending so as to contact the head of the fixture and the other end having the valve. A driving operation stopping arm extending so as to abut the piston pressing means; The arm is attached to the nose and the driving machine main body so as to be able to move in parallel along the axis of the nose, and moves in conjunction with the fastener being driven into the object at a predetermined depth, thereby moving the valve piston. It is characterized in that it is pushed into the trigger passage seal position. Thus, when the driving of the fastener by the continuous hitting type fastener driving machine is completed, the driving operation is appropriately and automatically stopped, and the driving to the object can be finished without any dents without any skill. .

According to a second aspect of the present invention, the driving operation stopping arm is provided with an adjusting member for extending and contracting the entire length of the arm, and the arm is fixed by adjusting the arm length. The driving depth of the tool can be adjusted. According to a third aspect of the present invention, in the continuous driving type fastener driving machine, three nested tubular members are slidably provided at the tip of the nose, and a chuck is provided on the outer first tubular member. Is attached to support the fastener inserted from the tip of the nose, and the second cylindrical member in the middle receives the head of the fastener inserted from the tip of the nose and drives the inside of the fastener. The distal end of the member reciprocates and strikes the fastener head, and the inner third tubular member contacts the fastener head received in the second tubular member to insert the fastener. The second cylindrical member is connected to the driving operation stopping arm, and the third cylindrical member is connected to a safety arm extending to a trip lever provided on a trigger lever. And thus the inserted fastener Safety arm not to perform the nailing operation of the trigger valve unless pressed against the object, the driving operation stop arm provided independently thereby achieving a safety fastener driving machine.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a continuous fastener driving device according to the present invention. In the illustrated embodiment,
For convenience of explanation, let the nails be supported one by one from the tip of the nose,
A continuous driving type nailing machine 1 using pressurized air is shown, in which a main piston is reciprocated many times and a nail is driven while hitting the nail continuously multiple times. Examples of the fixing tool include various nails, and in addition to nails, for example, screws. FIG. 1 shows a nailing machine 1
FIG. 2 is a cross-sectional view taken substantially along the line II-II of FIG. The continuous nailing machine 1 has a housing 3 in which a reservoir 2 for storing pressurized air supplied from the outside therein is formed. The housing 3 is formed so as to cover the main cylinder 5 from outside. The right part of FIG. 1 shows a part of a handle 7 for holding the nailing machine 1, and an end (not shown) is supplied with pressurized air from the outside. The handle 7 has a trigger device 9
Is provided. A nose 10 for driving a nail 8 as a fixing tool is provided at a lower portion of the housing 3. The nail 8 is inserted into the nose 10 one by one from the tip and supported by the chuck 11.

A main piston 13 is accommodated inside the main cylinder 5 so as to reciprocate. A blade 14 as a driving member for hitting a nail at the nose 10 is connected to the main piston 13. I have. A return chamber 6 is formed between the outer periphery of the main cylinder 5 and the inner wall of the housing 3 for storing pressurized air for return. Since the main cylinder 5 communicates with the return chamber 6 through the lower hole 15, when the main piston 13 descends by a striking operation, the air below the main piston 13 is stored in the return chamber 6 while being pressurized. A plurality of small holes 17 are formed in the circumferential direction at an intermediate position of the main cylinder 5, and an O-ring 18 for a check valve is provided on the outer surface thereof,
When the cylinder 3 descends from that portion, the pressurized air on the upper surface side of the main piston, that is, the pressurized air of the reservoir 2 is also stored in the return chamber 6. The pressurized air in the return chamber 6 is returned to the main cylinder 5 through the lower hole 15 and is used for raising or returning the main piston 13.

A main valve 19 is provided above the main cylinder 5 to control the supply of pressurized air to the main cylinder 5 and its stop. For the control, the main valve 19 is provided with a stationary position (down position) for preventing the supply of pressurized air to the main cylinder 5 and a main cylinder 5
Is moved from the upper part to the firing position (elevated position) for supplying pressurized air to the upper surface of the main piston 13. The pressurized air of the reservoir 2 always acts on the lower side of the main valve 19. A main valve chamber 21 that receives pressurized air from the reservoir 2 is formed above the main valve 19. Since the pressure receiving area on the upper side of the main valve 19 is large, when the pressurized air of the reservoir 2 is supplied to the main valve chamber 21, the acting force of the pressurized air of the main valve chamber 21 is large and the main valve 19
Stays in the rest position and maintains a seal with the upper end of the main cylinder 5. When the pressurized air in the main valve chamber 21 is exhausted, the main valve 19 is raised by the action of the pressurized air in the reservoir 2 constantly applied to the lower side of the main valve 19, and the seal with the main cylinder 5 is released. Then, pressurized air from the reservoir 2 is supplied to the main cylinder 5. The main valve 19 includes a trigger valve 22 of the trigger device 9 and a fixing tool such as a nail at the tip of the nose 10 by reciprocating the main piston 13 a plurality of times when the trigger valve 22 is operated. The main piston is controlled by the main piston control means 23 which strikes the object while being hit repeatedly.

The trigger valve 22 includes a valve cylinder 25
And a valve piston 26.
In the state of FIG. 1 in which the trigger lever 27 is not pulled, the lowermost position (the most protruding position) is at the rest position, and the nail 8 in the nose 10 is moved to the driving object 2 such as a pillar.
8 (see FIG. 3) and pull the trigger lever 27 to move it upward. When the valve piston 26 is at the rest position, the pressurized air in the reservoir 2
5 is supplied to the trigger passage 29 through a gap between the valve piston 26 and the valve cylinder 25 from a hole 61 provided in the valve housing on the upper end side. Trigger passage 29
Extends to the lower chamber 31 of the control valve 30 of the main piston control means 23. This control valve 30
Is a valve for selectively controlling supply and exhaust of pressurized air in the main valve chamber 21 of the main valve 19. When the valve piston 26 is at the rest position, the valve pin 32 of the control valve 30 is in the upper position, and pressurized air is supplied from the reservoir 2 to the main valve chamber 21 through the gap between the valve pin 32 and the main valve 19.
The air pressure of the pressurized air is also applied to the upper surface of the main valve 19, and the main valve 19 maintains the lowered stationary position due to the difference in the pressure receiving area.

When the nail 8 in the nose 10 is pressed against the object 28 and the trigger lever 27 is pulled, the valve piston 26 is pushed in and pushed up to the upper operating position in FIG. The gap is closed, the supply of pressurized air to the trigger passage 29 is stopped, and the air in the trigger passage 29 is
Is exhausted to the atmosphere through a hole 37 provided in the valve housing at the lower part of the valve housing. Accordingly, the pressurized air in the lower chamber 31 of the control valve 30 is exhausted, and the valve pin 32 of the control valve 30 is lowered. When the valve pin 32 is lowered, the supply of the pressurized air in the main valve chamber 21 is stopped, and the pressurized air in the main valve chamber 21 is exhausted to the outside through the control valve 30. Therefore, the air pressure on the upper surface side of the main valve 19 decreases,
On the other hand, since the air pressure of the pressurized air of the reservoir 2 is constantly acting on the lower surface side, the main valve 19 moves to the upper operating position to release the seal with the main cylinder 5,
The pressurized air of the reservoir 2 is supplied to the main cylinder 5, and the pressurized air is sent to the upper surface of the main piston 13 to rapidly lower the main piston 13 and the blade 14, and
Hit the head of the nail at zero.

When the trigger lever 27 is released and the valve piston 26 is lowered to the rest position, the pressurized air of the reservoir 2 is again supplied to the lower chamber 31 of the control valve 30 from the trigger passage, and the valve pin of the control valve 30 is changed. Then, pressurized air is supplied to the main valve chamber 21 and the main valve 19 is lowered to the rest position. By the return of the main valve 19 to the rest position, the supply of the pressurized air to the main cylinder 5 is stopped, the force for pushing down the main piston 13 is eliminated, and the pressurized air stored in the return chamber 6 is removed. It acts on the lower surface of the main piston 13 to push up the main piston 13. Further, the air in the main cylinder 5 on the upper surface side of the main piston 13 is lowered by the lowering of the main valve 19, and the upper end of the main valve 19 and the valve washer 3 above the main valve 19.
Since the seal with 3 is released, the air is exhausted from above the main valve 19 to the outside. Therefore, the main piston 13
Returns to the rest position in the main cylinder 5 by the action of the pressurized air from the return chamber 6. In this manner, the operation of the trigger valve 22 of the trigger device 9 controls the main valve 19 and controls the main piston 13.

It is the main piston control means 23 that controls the main piston so that the nail 8 is continuously struck when the trigger valve 22 is operated. Main piston control means 23
Is composed of the control valve 30 and a check valve 34 shown in FIG. As shown in FIG. 2, the check valve 34 is adjacent to the control valve 30 and is provided between the lower chamber 31 of the control valve 30 and the return chamber 6 so as to control the control valve 30. The operation of the main piston control means 23 is schematically described as follows. Valve pin 3 of control valve 30
Reference numeral 2 denotes a pressurized air supply position for supplying pressurized air of the reservoir 2 to the main valve chamber 21 (an ascending position shown in the left half of FIG. 1), and an exhaust position for exhausting air from the main valve chamber 21 (see FIG. 1). (Lower position shown in the right half). During operation of the trigger valve 22, when the main piston 13 suddenly descends and hits the nail 8, pressurized air is stored in the return chamber 6.

The pressurized air in the return chamber 6 acts on the check valve 34 to switch the check valve 34 and is supplied to the lower chamber 31 of the control valve 30. As a result, the valve pin 32 of the control valve 30 at the exhaust position (down position) is moved to the pressurized air supply position (up position), whereby the pressurized air of the reservoir 2 is transferred to the main valve chamber 21 of the main valve 19. The supplied main valve 19 at the firing position (elevated position)
Moves to the rest position (down position). As a result, the supply of the pressurized air of the reservoir 2 to the upper surface of the main piston 13 is stopped, the main piston 13 is returned, and the air pressure of the return chamber 6 is also reduced. The supply of pressurized air from the return chamber 6 to the check valve 34 is stopped and the check valve 34 returns to the initial position.
The supply of pressurized air to the lower chamber 31 of
The valve pin 32 of the control valve 30 is returned to the exhaust position. Again, the pressurized air in the main valve chamber 21 is exhausted, the main piston 13 descends, the blade 14 again strikes the head of the nail 8 of the nose 10, and the pressurized air accumulates in the return chamber 6. By repeating these operations, the nail 8 of the nose 10 is continuously hit. The continuous striking mechanism shown in this embodiment is not essential for the present invention, and for example, a continuous striking mechanism described in Japanese Patent Application Laid-Open Nos. 9-131669 and 9-300237 may be used.

[0015] The nailing machine 1 removes a nail from the tip of a nose 10.
The trigger valve 27 is moved to the firing position by pulling the trigger lever 27,
This is a continuous nailing machine in which the main piston 13 and the blade 14 are reciprocated a number of times to strike the nail while hitting the nail a plurality of times. In a conventional nailing machine with a continuous hitting mechanism, the completion of nailing is determined by experience and can. Therefore, even if the driving is completed, the driving may continue to be performed, and the excessive driving may leave a dent on an object such as a pillar to deteriorate the finish, or the driving may be continued after the driving is completed. ,
The pressurized air was wasted and the driving time was lengthened.

In the present invention, a mechanism for automatically stopping the driving operation when the driving of the nail is completed is provided. This automatic driving stop mechanism includes a driving operation stopping arm 35 extending from the tip of the nose 10 to the trigger lever, and the valve piston 26 of the trigger valve 22 further moves from the raised trigger operation position, which is the normal firing position. The trigger passage 29 is configured to be able to move to a trigger passage sealing position (see FIGS. 5 and 6 (D)) for sealing the trigger passage 29 which has been pushed and raised. Further, the valve piston 26 has
O-ring 36 for controlling the supply of pressurized air to the trigger passage 29 from a hole 61 in the valve housing of the trigger valve.
An O-ring 40 for controlling the flow of pressurized air from the trigger passage 29 to the hole 37 of the valve housing below the valve cylinder 25; and an O-ring 3 for sealing the hole 37.
8 are provided. Hereinafter, the automatic driving stop mechanism will be described including the configuration of the other nose portion and the configuration of the trigger device 9.

The tip of the nose 10 has three nested cylindrical members 39, 41, 4 which are slidable with each other.
Two. The outer first cylindrical member 39 is formed to have the largest diameter, and extends to the most distal end side of the nose 10. The chuck 11 is attached to the first cylindrical member 39, and supports the nail 8 inserted from the tip of the nose. A spring 46 is provided at the upper end of the first tubular member 39 between the outer portion 45 connected to the nose body 43 fixed to the housing 3, and the first tubular portion 39 is moved toward the distal end of the nose 10. The spring is biased. Also outer part 45
Is formed with a locking portion 47 (see FIG. 2) for preventing the first tubular member 39 from falling off.

The intermediate second cylindrical member 41 is a part of the automatic driving stop mechanism according to the present invention, and is formed so as to receive the head of the nail 8 inserted from the tip of the nose.
The nail 8 received in the tubular member 41 is hit by the reciprocating blade 14. A spring 49 is also provided between the upper end of the second tubular member 41 and the outer portion of the nose body 43, and biases the second tubular portion 41 toward the distal end of the nose 10. The inner third tubular member 42 is
The nose body 43 is slidably provided outside the nose body 43 and has a tip for stopping the insertion of the fixing tool by contacting the fixing tool head received by the second tubular member 41. In addition,
The distal end of the third cylindrical member 42 may be formed to have a stepped inner peripheral surface for receiving a nail head having a small diameter head. The first to third cylindrical members 39 to 42 are slidably mounted along the axis of the nose body 43.

The third cylindrical member 42 is, as shown in FIG.
An arm 51 extends from the upper end portion 50, and the arm 51 extends toward a trip lever 53 pivotally supported at the tip of the trigger lever 27 as shown in FIG. A spring (not shown) is also provided between the third tubular member 42 and the nose body 43 to bias the third tubular member 42 toward the distal end of the nose 10. The third tubular member 42 and the arm 51 are pressed by the nail 28 inserted and held in the nose 10 against the object 28.
And pulling the trigger lever 27 so as not to act on the trigger valve 22 unless the arm 51 is pushed up.
Functions as a safety arm. That is, in FIG.
The nail 8 is inserted into the first cylindrical portion 39 of the nose 10 and held by the chuck 11, but the nail 8 is not pressed against the object 28, so that the upper end of the arm 51 is attached to the tip of the trip lever 53. Does not work. Therefore, even if the trigger lever 27 is pulled, the trip lever 53 does not reach the tip (lower end) of the valve piston 26 of the trigger valve 22, and does not operate the trigger valve 22, thus inadvertently firing a nail. Has been prevented. However, when the nail 8 is pressed against the object 28 as shown in FIG.
The head of the nail 8 raises the third tubular member 42 and the arm 51
And the upper end of the arm 51 pushes up the tip of the trip lever 53. When the trigger lever 27 is pulled in this state, as shown in FIG.
1 is pivoted with the upper end of 1 as a fulcrum, and the tip (lower end) of the valve piston 26 is pushed up to operate the trigger valve 22. Such a safety mechanism is publicly known, and further description is omitted.

The second cylindrical member 41 has an upper end 54
Are connected to the driving operation stopping arm 35. The driving operation stopping arm 35 extends toward the trip lever 53 in parallel with the safety arm 51, and the second cylindrical member 41.
Moves up so as to push up the trip lever 53. That is, as shown in FIG. 5, when the nail 8 is completely driven into the object 28, the tip of the second cylindrical member 41 comes into contact with the object 28, and the second cylindrical member 41 , The driving operation stopping arm 35 is raised, and the trip lever 53 is raised. When the trip lever 53 is raised, the valve piston 26 whose tip (lower end) is in contact with the trip lever 53 is further raised, and moves the valve piston 26 to the trigger passage seal position. By this movement,
The O-ring 38 of the valve piston 26 seals the hole 37 on the lower side of the valve cylinder 25 and prevents exhaust from the trigger passage 29. In addition, the safety arm 51 and the driving operation stopping arm 35
So that it can slide parallel to the axial direction of the nose 10,
The housing 3 is provided with a holding block 55, and the holding block 55 is provided with a guide pin 57. Further, the holding block 55 is provided with a locking lock 58 for locking the tip of the trip lever 53, and together with the safety arm 51, forms a double safety mechanism. That is, as long as the trip lever 53 is locked to the locking lock 58, the trigger lever 27 cannot be pulled even if it is pulled. As long as the nail 8 inserted and held in the nose 10 is not pressed against the object 28,
Since this locking does not come off, the explosion in a state where the nose nail is not pressed against the object is avoided in combination with the safety arm in a double manner.

The nailing machine 1 according to the present invention having the above configuration.
The operation of driving a nail and the automatic stop of the driving when the driving is completed will be described with reference to FIGS. 1, 3 to 5 and 6 (A) to (D). In FIG. 1, the head 59 of the nail 8 is hooked on the tip of the chuck 11 of the first cylindrical portion 39 of the nose 10 as shown by a broken line, and is turned to the position indicated by the solid line. 39 and held by the chuck 11. FIG.
(A) shows the details of the trigger valve 22 in a stationary state before the nail is held and driven. The valve piston 26 of the trigger valve 22 is in the lowered rest position. That is, the pressurized air of the reservoir 2 formed inside the handle 7 is supplied into the valve cylinder from the supply hole 61 at the upper end of the valve cylinder 25, and pushes down the valve piston 26 to a stationary position to hold the valve piston 26. Piston 2
The air is sent to the trigger passage 29 through a gap formed between the valve cylinder 6 and the valve cylinder 25, and holds the main valve 19 in a stationary position, that is, a position where compressed air is not supplied to the main cylinder.

As shown in FIG. 3, the nailing machine 1 holding the nail 8 is brought to the object 28, and the tip of the nail 8 is applied to a predetermined position of the object 28 and pressed. by this,
The third cylindrical member 42 is pushed up, the safety arm 51 is pushed up, the upper end of the safety arm 51 pushes up the trip lever 53, the lock with the lock 58 is released, and the trigger lever 27 is pulled. Operation is enabled. FIG.
Referring to (B), details of the portion of the trigger valve 22 are clearly shown. Since the trigger lever 27 is not pulled, the valve piston 26 is held at the stationary position, the pressurized air of the reservoir 2 is sent to the trigger passage 29, and the main valve 19 is kept at the stationary position.

As shown in FIG. 4, when the trigger lever 27 is pulled, the trip lever 53 pivots counterclockwise around the tip of the safety arm 51 pushing up the lever.
The portion in contact with the tip (lower end) of the valve piston 26 pushes up the valve piston 26. This position is the firing position of the trigger valve. In FIG. 6C, the tip of the safety arm 51 pushes up the trip lever 53, and the valve piston 26 is held at the firing position by the pulled up trigger lever 27. In this position, the supply of pressurized air to the trigger passage 29 is stopped by the O-ring 36 and the trigger passage 29
Is released from the lower hole 37 of the valve cylinder 25 through the gap between the valve cylinder 25 and the valve piston 26 because the seal by the O-ring 40 is released. As a result, the main valve 19 is raised to the firing position (see the right half of FIG. 4), and the pressurized air of the reservoir 2 is supplied to the main cylinder 5 so that the main piston 13
Descends sharply with the blade 14 and strikes the nail 8 of the nose 10 to strike the object 28. As described above, this impact is repeated a plurality of times by the main piston control means 23, and the nail 8 is gradually driven into the object 28. With this driving, the first tubular member 39 is pushed up, so that the second tubular member 41 relatively moves to the first tubular member 3.
9, the tip of which contacts the object 28. When the driving continues, the second tubular member 41 becomes the first tubular member 39.
It is pushed up with.

FIG. 5 shows a state in which the nail 8 is continuously hit and completely driven into the object 28. The distal end of the second cylindrical member 41 is connected to the head 59 of the nail 8 driven in contact with the object 28.
And at this position, the second tubular member 41
Is further pushed up from the position in FIG. 4 to raise the driving operation stopping arm 35. With this rise, arm 3
5 raises the trip lever 53 and moves the valve piston 2
6 is further raised from the firing position in FIG. 4 to move the valve piston 26 to the trigger passage sealing position. FIG. 6 (D)
In the figure, the O-ring 38 of the valve piston 26 seals the hole 37 on the lower side of the valve cylinder 25 to prevent exhaust from the trigger passage 29. By preventing the exhaust, the control valve 30 of the main piston control means 23 is controlled.
The valve pin 32 of the main valve 19 remains at the position for supplying pressurized air to the main valve chamber 21 of the main valve 19, whereby the main valve 19 is held at the stationary position, and accordingly, the main piston 13 is moved to the left in FIG. It is held in the rest position shown in half. Therefore, when the driving of the nail 8 is completed, the second cylindrical member 41 and the driving operation stopping arm 35
, The driving operation of the nailing machine 1 is automatically stopped. By this stop, the worker can know the completion of the driving, and can finish the driving work by separating the nailing machine 1 from the object.

It is preferable that an adjusting member 62 that extends and contracts the entire length of the arm is provided in the middle of the driving operation stopping arm 35. By adjusting the length of the driving operation stopping arm 35, the driving depth of the nail 8 can be reduced. Can be adjusted. Further, in the above description, the automatic driving mechanism for the driving operation according to the present invention has been described for the continuous driving nailing machine 1. A mechanism can be employed.

[0026]

According to the continuous driving type fastener driving machine of the present invention,
The valve piston of the trigger valve is configured to be movable from a trigger operation position, which is a firing position, to a further pushed trigger passage seal position, at which position the valve piston communicates the trigger passage with the atmosphere. Blocks and returns the main valve to the rest position, the nose can be moved by a driving stop arm with one end extending to abut the head of the fastener and the other end extending to the trigger valve The driving operation stopping arm moves and pushes the valve piston into the trigger passage seal position in conjunction with the fixing tool being driven into the object at a predetermined depth, so that when the driving of the fixing tool is completed, In addition, the driving operation is automatically stopped, and the driving to the object can be properly completed without requiring skill.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a stationary state of a pneumatic nailing machine as a continuous-punching pneumatic fastener driving machine according to the present invention, with a part of a handle omitted.

FIG. 2 is a cross-sectional view of the nailer of FIG. 1 taken substantially along the line II-II.

FIG. 3 is a cross-sectional view similar to that of the nailing machine of FIG. 1, showing a state immediately before driving a nail held in a nose into an object.

FIG. 4 is a cross-sectional view similar to the nailer of FIG. 1 during driving a nail into an object.

FIG. 5 is a cross-sectional view similar to that of the nailing machine of FIG. 1 showing a state where driving of a nail into an object is completed.

6A and 6B are enlarged views showing the trigger valve in the state shown in FIG. 1 and FIGS. 3 to 5 and a peripheral portion thereof. FIG. 6A shows a state in which the trigger valve in FIG. 4) shows the state immediately before the driving in FIG. 3, (C) shows the state during the driving in FIG. 4, and (D) shows the state in which the driving is completed in FIG. 5.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 continuous-type nailing machine (continuous-type fastener driving machine) 2 reservoir 3 housing 5 main cylinder 6 return chamber 7 handle 8 nail 9 trigger device 10 nose 11 chuck 13 main piston 14 blade 15 lower hole 19 main valve 21 main valve Chamber 22 Trigger valve 23 Main piston control means 25 Trigger valve cylinder 26 Trigger valve piston 27 Trigger lever 28 Object 29 Passage 30 Control valve 31 Lower chamber of control valve 34 Check valve 35 Driving operation stop arm 37 Valve cylinder of trigger valve Lower holes 36, 38, 40 O-ring for sealing 39 First cylindrical member 41 Second cylindrical member 42 Third cylindrical member 43 Nose body 51 Safety arm 53 Trip lever 59 Nail head 62 Adjustment member

Claims (3)

[Claims] 1. A main cylinder having a main piston connected to a main cylinder, a driving member arranged to reciprocate in the main cylinder, and a driving member for hitting a fixing tool held at a tip of a nose; A main valve that moves between a stationary position that blocks the supply of pressurized air and a firing position that supplies pressurized air in the reservoir from the upper part of the main cylinder to the upper surface of the main piston; A trigger valve that has a trigger passage that selectively supplies or exhausts pressurized air to control the position of the main valve by controlling supply and exhaust, and reciprocates the main piston multiple times during operation of the trigger valve Main piston control means for moving and moving the fixing tool at the tip of the nose into the object while continuously hitting the fixing tool with the driving member In the fixing fastener driving machine, the trigger valve includes a valve cylinder and a valve piston that reciprocates in the valve cylinder, and when not in operation, pressurized air of a reservoir is supplied into the valve cylinder and the valve piston is moved. Maintaining the main valve at the stationary position by maintaining the main valve at the stationary position by maintaining the main valve at the stationary position by maintaining the trigger position at the most protruding position and sending out the pressurized air through the trigger passage, the valve piston presses the valve piston to the trigger passage. The pressurized air is stopped and the trigger passage is held at a trigger operation position pushed from the trigger rest position so that the trigger passage communicates with the atmosphere. Further, the valve piston is further pushed from the trigger operation position. The trigger passage seal position. In, the valve piston blocks the trigger passage from communicating with the atmosphere and supplies pressurized air to the main valve chamber,
The main valve is returned to the rest position, and the nose has a driving operation stop in which one end extends so as to abut against the head of the fastener and the other end extends so as to abut the valve piston pressing means. An arm is provided, and the driving operation stopping arm is attached to the nose and the driving machine main body so as to be able to move in parallel along the axis of the nose, and the fixing tool is driven into the object to a predetermined depth. Wherein the valve piston is pushed in the trigger passage sealing position. 2. The continuous driving type fastener driving machine according to claim 1, wherein the driving operation stopping arm is provided with an adjusting member for extending and contracting the entire length of the arm, and by adjusting the arm length, A continuous-strike type fastener driving machine characterized by adjusting the driving depth of the fastener. 3. The continuous driving type fastener driving machine according to claim 2, wherein three nested tubular members are slidably provided at the tip of the nose, and are provided on the outer first tubular member. Is attached with a chuck to support the fixing tool inserted from the tip of the nose. The intermediate second cylindrical member receives the head of the fixing tool inserted from the tip of the nose, and the inside is the same as the above. The tip of the driving member reciprocates and strikes the fixing tool head, and the inner third cylindrical member abuts on the fixing tool head received in the second cylindrical member to fix the fixing tool. Has a tip to stop insertion of the second cylindrical member is connected to the driving operation stop arm,
The third tubular member is connected to a safety arm that extends to a trip lever provided on a trigger lever, and is a continuous driving fastener driving machine.