JPH0578486U - Nail supply mechanism for nailer - Google Patents

Abstract

(57) [Summary] [Structure] Based on the operation of the trigger valve 3 and the contact member 1, the compressed air passing through the trigger valve 3 is supplied to the feed piston / cylinder mechanism 17 through the additional striking valve 19 and the contact valve 18. The additional feed valve 19 is operated to stop the air supply to the contact valve 18, and the additional feed valve 19 is held in the operating position by itself and automatically returned by the operation of the trigger valve 3. , Contact valve 1
8 was also self-held in the actuated position. [Effect] Even if nail driving is performed by the operation of the trigger valve 3 by operating the additional driving valve 19, the nail feeding cannot be performed, and therefore the additional driving can be performed. After that, since the additional driving valve 19 is returned, automatic nail feeding is performed. Due to the self-holding of the contact valve 18, the nail feeding cannot be performed by re-operation of the contact member 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nail supply mechanism of a nailing machine which can supply nails automatically, can be switched to the additional hammering mode at any time, and can return to the automatic nail feeding mode after the additional hammering.

[0002]

[Prior art]

 Generally, in a nailing machine that drives into steel plate or concrete, it is relatively often that part of the nail including the head floats from the surface of the driven material due to insufficient driving when the nail is hit. , It is necessary to make extra hits. Reinforcement means that the nail of the floating nail is accommodated in the nose of the nailing machine with no new nail supplied, and the nailing machine is idled to re-strike the head of the floating nail. Is to add.

In a conventional nail driving machine for concrete or the like, a method of manually supplying nails is adopted so as to enable additional driving. In this method, a nail feeding operation is performed by operating a nail feeding operation lever arranged near a grip for holding a tool to supply air to a nail feeding cylinder. However, it is troublesome to operate the operation lever etc. to supply the nails every time the nails are driven, which is a cause of impairing workability.

On the other hand, in a conventional nailing machine for nailing wood, a part of the air that has driven the piston is introduced into the nail feed cylinder so that at the end of the driving stroke of the striking piston. An automatic nail feeding mechanism is provided that automatically feeds the nail to the nose part by retracting the nail feeding piston and moving the nail feeding piston forward during the returning process of the striking piston. Therefore, the next nail has already been supplied into the nose at the end of nail driving. If this nail feed mechanism is adopted in a nailing machine for concrete, etc., since the nails are always supplied in the nose, the nails with a floating head are housed in the nose and re-strike is performed, so-called additional hammering is performed. I can't. If you dare to do it, it is not realistic because you have to remove the connecting nail loaded in the nailing machine from the nailing machine and empty the tool.

Therefore, a mechanism that improves the above mechanism and arranges an on-off valve in the middle of the air passage to the nail feeding cylinder to switch the state in which the operation of the nail feeding mechanism cannot be performed to enable additional hammering Is known (see Japanese Utility Model Laid-Open No. 62-53973). However, with this mechanism, even if the on-off valve is switched when the insufficient driving is recognized after driving the nail in the automatic feed mode, a new nail has already been supplied into the nose at that time, so the nail is no longer driven by the blank driving. If you don't remove it, you can't overdrive. Therefore, the additional hammering is a waste hammering in which one nail is wasted and the workability is poor because an operation for pulling out the nail is required. Furthermore, since the nail supply operation is not performed even if the on-off valve is switched when a new nail is driven in after the additional hammering is completed, one more idle hammering is performed and the nail feed mechanism is activated when the piston returns. Need to let.

[0006]

[The purpose of the device]

 In view of the problem that the conventional nailing machine has a problem that the next nail is sent into the nose before the worker recognizes that the "nails have floated", By setting the sending timing immediately before nailing, it was made paying attention to the fact that additional hammering (without nailing) or actual hammering (sending nails) can be selected at that time. It is possible to provide a nail supply mechanism that can automatically supply nails in connection with the hammering operation and can set a mode in which additional hammering can be set immediately if insufficient hammering occurs after nailing. In addition to the purpose, it is possible to automatically switch to the automatic nail feeding mode after the completion of additional hammering, and it is not possible to switch to the additional hammering mode after the nail is supplied. Providing a nail supply mechanism that can prevent two nails from being fed to the And an object of the present invention to be.

[0007]

[Means for achieving the purpose]

 To achieve the above object, a nail supply mechanism of a nailing machine according to the present invention supplies compressed air from a main chamber that stores compressed air to a main valve that controls driving of a striking piston in a striking cylinder. In addition, the compressed air supplied to the main valve is exhausted based on the operation of the trigger lever by the manual operation and the operation of the contact member by the abutting operation with respect to the material to be driven so that the main valve drives the striking piston. The trigger valve for starting and the feed piston constantly urged in the backward direction in the feed cylinder are supplied to the rear end of the feed cylinder by compressed air that has passed through the trigger valve. By operating the feed piston / cylinder mechanism that supplies the nails to the striking position and the contact member, A trigger valve and a contact valve are manually and intermittently arranged between the contact valve that operates to supply compressed air via the trigger valve to the rear end of the feed cylinder and the trigger valve and the contact valve. In addition to being installed, it is also equipped with a boosting valve that discharges the compressed air supplied to the contact valve when shutting off.

[0008] The additional-strike valve applies a spring force for urging the additional-strike valve stem housed in the additional-strike valve cylinder to a non-operating position where the trigger valve and the contact valve are connected, and When operated to the operating position to disconnect the connection, the compressed air supplied via the trigger valve causes the compressed air supplied from the trigger valve to hold itself, while the compressed air from the trigger valve is exhausted by the spring force. It may be configured to automatically return to the non-operation position.

[0009] Furthermore, the additional injection valve cylinder accommodates a piston separate from the additional injection valve stem, and a part of the compressed air supplied into the feed cylinder via the contact valve is added to the additional injection valve stem. The piston may be introduced into the cylinder so that the piston is engaged with the additional hammering valve stem to disable the intermittent operation.

Further, the contact valve spring biases the contact valve stem housed in the contact valve cylinder to a non-actuated position, and when the contact valve moves to the actuated position in conjunction with the operation of the contact member, the trigger valve is actuated. It is preferred that the compressed air passing through the valve be self-holding in the actuated position and that there be some play in the engagement between the contact valve stem and the contact member.

[0011]

[Function and effect of the device]

 According to the above configuration, when the additional injection valve is set to the non-operating position, compressed air is supplied to the contact valve via the trigger valve and the additional injection valve. At this time, the feed piston is in the retracted position.

When the contact member is brought into contact with the material to be driven and relatively moved at the time of driving the nail, the contact valve operates and compressed air is supplied to the rear end of the feed cylinder via the trigger valve to drive the feed piston. , Nail feeding is performed to the striking position.

In this case, if the contact valve stem is configured to be held in the operating position by the action of the compressed air that has passed through the trigger valve in the contact valve cylinder, the contact member is then operated again after moving downward. However, the contact valve stem does not operate and nail feeding is not performed. Therefore, it is possible to effectively prevent the malfunction of the nail by forcibly supplying the two nails into the nose portion.

In addition, a part of the compressed air supplied into the feed cylinder is introduced into the increased pressure valve cylinder to engage the piston with the increased pressure valve stem to make the intermittent operation impossible. In this case, since it is impossible to operate the additional stroke valve stem by pushing, it is possible to effectively prevent the occurrence of double feed.

When the contact member is pressed against the material to be driven and the trigger lever is operated to operate the trigger valve after the above-mentioned nail feeding is performed, the compressed air that has passed through the trigger valve is exhausted, so that the main valve is It operates and drives the impact piston in the impact cylinder to drive the nail. At this time, the compressed air that had been supplied to the feed cylinder via the incremental injection valve and contact valve is also discharged from the trigger valve, so the feed piston is operated in the backward direction and preparations for the next nail feed are made. ..

At this time, when adopting a configuration in which the contact valve self-holds in the operation position, the self-holding is released because the compressed air that has been supplied to the contact valve along with the exhaust of the compressed air is also exhausted. It Then, the trigger valve is returned to the initial state by the return operation of the trigger lever and the contact member, and the compressed air is again supplied to the main valve, the additional striking valve, and further to the contact valve. However, since the contact valve stem is released from self-holding and returned to the non-operating position, the supply of compressed air is stopped by the contact valve and is not supplied to the feed cylinder, so the feed piston moves to the retracted position. Retained.

Next, when performing additional hammering after driving the nail, the trigger valve and the contact valve are disconnected by operating the additional hammer valve stem to the operating position, and at the same time, it is supplied to the contact valve. Compressed air is exhausted. Even if the contact member is operated in this state, compressed air is not supplied to the contact valve, so compressed air is not supplied to the feed cylinder, and nail feeding is not performed. Therefore, by the operation of the contact member and the trigger lever, it is possible to perform the additional striking in which the head of the nail floating in the nose portion is accommodated and the nail is repeatedly hit.

According to the structure in which the additional injection valve is self-held, the additional injection valve stem itself is self-held in the operating position by the compressed air from the trigger valve when the above operation is performed. Since the compressed air is exhausted from the trigger valve as the nail driver is driven by, the compressed air that has been supplied to the additional hammer valve from the trigger valve is also exhausted. This releases the self-holding of the incremental injection valve, and when the additional injection is completed, the additional injection valve stem is automatically returned to the non-operating position by the spring force. Therefore, the nail will be fed again in the automatic feed mode from the next shot.

As described above, according to the invention of claim 1, when it is noticed that the nail floats immediately after the nail is driven, the additional drive valve is operated without discarding the nail. You can beat more. In normal times, the nail feed is automatically performed in relation to the nail driving operation, so work efficiency is good.

Further, according to the invention of claim 2, after the additional hammering, the additional hammering valve automatically returns to the non-operating position, so that the nailing work can be immediately performed in the automatic nail feeding mode, and the working efficiency is improved. Can be achieved.

Further, according to the invention of claim 3, since the additional hammer valve cannot be operated, it is possible to prevent accidental additional hammering work with the nail being supplied to the striking position, thereby preventing an accident or a tool. It is possible to prevent damage.

In addition, according to the invention of claim 4, after the nail is supplied by the automatic nail feeding, the nail feeding cannot be performed again even if the contact member is re-operated, so that the double feeding can be prevented.

Further, the contact valve spring-biases the contact valve stem housed in the contact valve cylinder to a non-operating position, and when the contact valve moves to the operating position in conjunction with the operation of the contact member, the trigger valve is activated. Self-holding in the actuated position by compressed air through the valve may provide play in the engagement between the contact valve stem and contact member.

[0024]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a nailing machine. The nailing machine is operated by bringing a lower end 1b of a contact member 1 into contact with a material P to be nailed. Based on the operation of moving relative to the machine body A and the pulling operation of the trigger lever 2, the starting trigger valve 3 is operated to drive the percussion piston 5 in the percussion cylinder 4, and the percussion piston 5 is connected. The driver 6 drives the nail in the nose portion 7 toward the driven material P, and the hitting mechanism is known.

The upper end 1 a of the contact member 1 is formed so as to be located near the trigger lever 2. On the other hand, as shown in FIG. 2, a rotating member 10 having a convex portion 9 that can be engaged with the trigger valve stem 8 of the trigger valve 3 is pivotally attached to the trigger lever 2, and the rotating member 10 is rotated. The dynamic torsion coil spring 11 and the return torsion coil spring 12 act on each other, and one end of the rotation torsion coil spring 11 is engaged with the upper end portion 1 a of the contact member 1. The convex portion 9 is normally biased to a position where it does not engage with the trigger valve stem 8 by the twisting coil spring 11 for rotation which engages with the upper end portion 1a of the contact member 1, so that the contact member 1 is brought into contact with the workpiece. When moving upward with respect to the main body of the nail driver, one end of the twisting coil spring 11 for rotation is pushed up to rotate the rotating member 10 (see FIG. 3), and when the trigger lever 2 is operated, the convex portion 9 causes the trigger valve to move. It is configured so that the stem 8 can be pushed and operated. Therefore, the starting trigger valve 3 operates based on the contacting operation of the contact member 1 with respect to the material P to be driven and the pulling operation of the trigger lever 2. When the contact member 1 returns to its original position, the return torsion coil spring 12 also returns the rotating member 10 to its original position.

Further, the driving of the striking piston 5 is directly controlled by the main valve 13 which operates so as to supply compressed air to the striking cylinder 4 or to stop the supply thereof. The main valve 13 is connected to the trigger valve 3 via air passages a and b as shown in FIG. The trigger valve 3 operates to connect the air passage a to the main chamber 14 storing the compressed air or the atmosphere. When the trigger lever 2 is not operated, the lower end of the trigger valve stem 8 is the trigger valve cylinder. 15, the air passages a and b are connected to the main chamber 14, compressed air is supplied into the air passages a and b, and the main valve 13 stops the supply of compressed air into the striking cylinder. On the other hand, by operating the trigger lever 2 and pushing the trigger valve stem 8, the air passages a and b are exhausted from the trigger valve cylinder 15 and the main valve 13 is moved to the striking cylinder 4 as shown in FIG. It supplies compressed air and operates so as to drive the striking piston 5.

Next, the nails are stored in the magazine 16 (see FIG. 1) in a linked state. This connecting nail is supplied to the striking position of the nose portion 7 by a nail supply mechanism. This nail supply mechanism includes the trigger valve 3, the feed piston / cylinder mechanism 17, the contact valve 18, and the additional striking valve. It is composed of 19 and.

As shown in FIG. 2, the feed piston / cylinder mechanism 17 has a feed piston 21 slidable in the front-rear direction in a feed cylinder 20 connected to the trigger valve 3 via air passages a, c, d, and e. In addition, the feed piston 21 is constantly urged in the backward direction by the compressed air supplied from the main chamber 14 through the air passage g at the front end of the feed cylinder 20, and at the rear end of the feed cylinder 20 from the main chamber 14. By supplying compressed air via the trigger valve 3, the feed piston 21 is advanced and the leading nail of the connecting nail (not shown) is supplied to the striking position.

As shown in FIG. 2, the contact valve 18 is provided at an intermediate portion (between the air passages d and e) of the air passages a, c, d, and e that connect the feed piston / cylinder mechanism 17 and the trigger valve 3. The contact valve stem 23 is accommodated in the contact valve cylinder 22 so as to be slidable in the vertical direction. The contact valve stem 23 is always urged to the non-operating position (downward position) by the vane 24, and the non-operating position is also set. In this case, the air passages d and e are shut off so that compressed air is not supplied to the feed cylinder 20, and conversely, when in the operating position (upper position) (see FIG. 3), the air passages d and e are Open e to operate so that compressed air is supplied to the feed cylinder 20. The upper end projection 23a of the contact valve stem 23 is disposed so as to be engageable with the bent portion 1b in the upper portion of the contact member 1, and the contact member 1 abuts on the material P to be driven and is moved upward with respect to the nailing machine main body A. When it is relatively moved, the bent portion 1b is engaged with the upper end protrusion 23a of the contact valve stem 23 to move in conjunction with the operating position.

When the play between the contact valve stem 23 and the contact member 1 is free, that is, when the contact member 1 moves upward, the bent portion 1 b is located at the upper end projection 23 a of the contact valve stem 23. A play is formed which is engaged but does not engage the contact valve stem 23 when the contact member 1 moves downward, or weakly engages when engaged. Specifically, the upper surface of the bent portion 1b may be in contact with the lower surface of the upper end projection 23a of the contact valve stem 23 only when the contact member 1 moves upward.

Further, in the contact valve cylinder 22, the contact valve stem 23 is biased upward by the air pressure of the compressed air introduced into the contact valve cylinder 22 when the air passages a, c, d, and e are opened, and the bias is applied. The pressure and the spring pressure of the spring 24 for urging the contact valve stem 23 downward are equal to each other, or the urging pressure is set to be higher. Therefore, when the contact valve stem 23 is moved to the operation position (upward position), it is self-held in the same position.

The additional injection valve 19 is an air passage c between the trigger valve 3 and the contact valve 18 among the air passages a, c, d, and e that connect the trigger valve 3 and the feed piston / cylinder mechanism 17 to each other. The upper end 27a of the additional injection valve stem 27 is projected upward from the additional injection valve stem 27 while the additional injection valve stem 27 is accommodated in the additional injection valve cylinder 26 slidably in the vertical direction. , It can be manually pushed down. The additional stroke valve stem 27 is constantly urged upward by the spring 28, and when the additional stroke valve stem 27 is in the non-operating position (upper position), the air passages c and d are connected. When the additional hitting valve stem 27 is pushed and moved to the operating position (downward position) (see FIG. 5), the air passages c and d are cut off and the air passage e leading to the contact valve 18 is opened to the atmosphere. Is formed.

By the way, as shown in FIG. 5, the additional injection valve 19 is an additional injection valve cylinder in which compressed air from the air passages a and c communicating with the trigger valve 3 when the air passages c and d are blocked. When introduced into the valve 26, the air pressure urges the additional striking valve stem 27 downward, and this urging pressure is equal to the spring pressure of the spring 28 for urging the additional striking valve stem 27 upward. The biasing pressure is set to be higher. Therefore, when the additional hitting valve stem 27 is moved to the operating position (the lower air passage blocking position), it is self-held at the same position. Since this self-holding is obtained by air pressure, as the compressed air supplied from the trigger valve 3 is exhausted, the additional hitting valve stem 27 is moved to the upper non-operating position ( Automatic return to the air passage connection position).

Further, as shown in FIG. 2, the valve cylinder 26 of the additional hitting valve 19 accommodates a piston 29 below the additional hitting valve stem 27, and the lower end of the additional hitting valve cylinder 26 has the above contact. An inlet of an air passage f branched from an air passage e connecting the valve 18 and the feed cylinder 20 is formed. Therefore, when the compressed air is not supplied to the feed cylinder 20, the piston 29 is at the lower position, but when the compressed air is supplied to the feed cylinder 20 (see FIG. 3), a part of the compressed air is supplied. Is introduced into the additional injection valve cylinder 26 from the air passage f, and the piston 29 moves upward to engage the additional injection valve stem 27.

Next, the manner of use of the nail supply mechanism will be described. When the additional hammer valve 19 is set in the non-operating position (upper position) and the automatic nail supply mode is set as shown in FIG. The compressed air is supplied to the main valve 13 and the additional hitting valve 19 via the trigger valve 3 and the air passages a and b and the air passages a, c, c and d. The compressed air supplied to the additional pressurization valve 19 is supplied to the contact valve 18. Since compressed air is constantly supplied from the main chamber 14 to the front end of the feed cylinder 20, the feed piston 21 is in the retracted position.

Here, when the nose portion of the nailing machine is brought into contact with the material to be nailed in order to carry out nailing, the contact member 1 inevitably moves relatively, so that the bent portion 1b at the upper portion is moved as shown in FIG. The contact valve stem 23 is moved to the operating position (upward position). The operation of the contact valve stem 23 opens the air passages c and d connecting the additional hitting valve 19 and the feed cylinder 20, and the compressed air that has passed through the trigger valve 3 is supplied to the rear end of the feed cylinder 20. Is driven forward to feed the leading nail of the connecting nail into the nose area. Since the contact valve stem 23 is self-held in the operating position by the same action of compressed air, the contact valve stem 23 does not operate and the nail is fed even if the contact member 1 is moved downward and then operated again. Absent. Therefore, it is possible to effectively prevent the defective operation due to the two nails being forcibly supplied into the nose portion 7. FIG. 3 shows a state in which the contact valve stem 23 is pulled up by the contact member 1 and then further pulled up by the air pressure of the compressed air introduced into the valve cylinder 22.

Next, a part of the compressed air supplied to the feed cylinder 20 is simultaneously supplied to the lower end of the additional striking valve cylinder 26 through the air passage f. The piston 29 in the cylinder 26 is moved upward, and the piston 29 is additionally engaged with the valve striking valve stem 27 to be supported from below. For this reason, it is impossible to push in the additional stroke valve stem 27. If it is possible to operate the additional injection valve 19 after the nail is supplied, this operation releases the compressed air supplied to the rear end of the feed cylinder 20 via the contact valve 18 to the atmosphere. As a result, the feed piston 21 moves backward, causing double feed. However, since the piston 29 prevents the additional stroke valve 19 from being operated after the nail is supplied, the double feed does not occur. Further, since the operator can recognize that the additional hitting valve stem 27 cannot be operated, erroneous operation can be prevented.

Next, as shown in FIG. 4, when the trigger lever 2 is operated after the operation of the contact member 1, the trigger valve 3 is activated and the compressed air supplied to the main valve 13 is discharged to the atmosphere. The main valve 13 operates and nailing is performed. At this time, the compressed air that has been supplied to the rear end of the feed cylinder 20 via the additional injection valve 19 and the contact valve 18 is also discharged to the atmosphere from the trigger valve 3, so that it is introduced from the front end of the cylinder 20. By the compressed air, the feed piston 21 is actuated in the backward movement direction, and the next nail is ready to be fed.

At this time, the compressed air that has been holding the contact valve 18 in the operating position is also discharged, so that the self-holding is released and the contact valve 18 returns to the non-operating position in FIG. Then, the trigger valve 2 and the contact member 1 are restored to return the trigger valve 3 to the initial state (position in FIG. 2), and compressed air is supplied to the main valve 13 and the additional hitting valve 19 again. When the main valve 13 is actuated by the compressed air, the striking cylinder 4 is closed to the main chamber 14 and the striking piston 5 returns, as shown in FIG. On the other hand, the compressed air supplied to the additional hitting valve 19 is further supplied to the contact valve 18. However, since the contact valve system 23 is released from the self-holding state and returned to the non-operating position, the supply of the compressed air is stopped by the contact valve 18 and is not supplied to the feed cylinder 20. Remains in the initial retracted position.

By the way, as shown in FIG. 3, when the contact valve stem 23 is actuated to the upper position based on the operation of the contact member 1 and the nail is supplied, if the nailing operation is interrupted, the contact member is interrupted. 1 returns, so that if the contact valve stem 23 also works in tandem with this return and overcomes the self-holding force by the spring force that returns the contact member 1, the compressed air in the feed cylinder 20 is returned to the valve cylinder. Since the gas is exhausted from 22, the feed piston 21 in the feed cylinder 20 returns. Further, the compressed air pressure against the lower surface of the piston 29 in the additional injection valve also decreases, so that the additional injection valve 19 can be operated. Therefore, when the contact member 1 is operated to restart the nailing operation again after this state, compressed air is supplied to the feed valve cylinder 20 again, so that double feed occurs. Further, since the additional injection valve 19 can be operated, there is a possibility that an erroneous operation may occur in which the additional injection operation is forgotten that the nail has already been supplied.

However, since a play is formed between the contact member 1 and the contact valve stem 23, once the contact member 1 is operated and the contact valve stem 23 is self-held in an activated state, Even if the contact member 1 is returned, the self-holding of the contact valve stem 23 is maintained. Therefore, it is possible to prevent the occurrence of double feed and the phenomenon of operating the additional injection valve 19.

Next, when nailing is completed in the normal automatic nail feed mode, if insufficient nailing occurs, it is necessary to perform additional hammering. In this case, immediately after the nail driving is completed, the additional driving valve stem 27 is pushed into the operating position as shown in FIG. As a result, the nail supply mechanism is set to the additional striking mode, the air passages c and d connecting the trigger valve 3 and the contact valve 18 are cut off, and at the same time, the air passages d and e connected to the contact valve 18 are closed. Open to the atmosphere. Even if the contact member 1 is operated in this state as shown in FIG. 6, since compressed air is not supplied to the contact valve 18, compressed air is not supplied to the feed cylinder 20 as well, so that nail feeding is performed. I can't. Therefore, as shown in FIG. 7, by the operation of the contact member 1 and the trigger lever 2, it is possible to perform the additional striking with a re-hit while the head of the nail floating in the nose is accommodated.

When the above pushing operation is performed, the additional hammer valve stem 27 itself is held in the operating position by the compressed air from the trigger valve 3, but the nail hammer is driven by the additional hammer driving. Since the compressed air supplied via the trigger valve 3 is exhausted, the compressed air supplied from the trigger valve 3 to the additional hitting valve 19 is also exhausted. As a result, as shown in the figure, the self-holding of the additional injection valve 19 is released, and when the additional injection is completed, the additional injection valve 19 is automatically moved to the non-operating position (upward position) by the spring force of the spring 28. Will be returned. Therefore, from the next shot, the nail supply mechanism returns to the automatic feed mode.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a nailing machine according to the present invention.

FIG. 2 is a cross-sectional explanatory view of an automatic nail feed mode of the nail supply mechanism of the nail driver.

FIG. 3 is an explanatory view of an operation mode when a contact member is operated in the nail supply mechanism.

FIG. 4 is an explanatory diagram of an operation mode when the trigger lever is further operated in the nail supply mechanism.

FIG. 5 is a cross-sectional explanatory view of the nail supply mechanism in the additional striking mode.

FIG. 6 is an explanatory view of an operation mode when a contact member is operated in the nail supply mechanism.

FIG. 7 is an explanatory diagram of an operation mode when the trigger lever is further operated in the nail supply mechanism.

[Explanation of symbols]

 A nailing machine body 1 contact member 2 trigger lever 3 main valve 4 striking cylinder 5 striking piston 13 main valve 14 main chamber 17 feed piston / cylinder mechanism 18 contact valve 19 additional striking valve 20 feed cylinder 21 feed piston 23 contact valve stem 26 Reinforcement valve cylinder 27 Reinforcement valve stem 29 Piston

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsushi Ogawa 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd. (72) Shinichi Yoshida 6-6 Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo Max Within the corporation

Claims (4)

[Scope of utility model registration request] 1. Compressed air from a main chamber that stores compressed air is supplied to a main valve that controls the drive of a striking piston in a striking cylinder, and a manual operation of a trigger lever and hitting of a material to be hit are performed. A starting trigger valve for activating the main valve to drive the striking piston by exhausting the compressed air supplied to the main valve based on the operation of the contact member by the contact operation; A feed piston that supplies the leading nail of the connecting nail to the striking position by supplying compressed air that has passed through the trigger valve to the rear end of the feed cylinder.
A cylinder mechanism; a contact valve for supplying compressed air via the trigger valve to the rear end of the feed cylinder by operating the contact member; and a manual contact with the trigger valve between the trigger valve and the contact valve. A nail supply mechanism for a nailing machine, characterized in that the valve and the valve are arranged so that they can be operated intermittently, and a additional driving valve for discharging compressed air supplied to the contact valve when shutting off. 2. The increased pressure valve applies a spring force for biasing the increased pressure valve stem housed in the increased pressure valve cylinder to a non-operating position for connecting the trigger valve and the contact valve, and the connection. When it is operated to the operation position to shut off the
The nail supply mechanism for a nailing machine according to claim 1, wherein the spring force automatically returns to the non-operating position as the compressed air from the trigger valve is discharged. 3. The increased pressure valve cylinder contains a piston separate from the increased pressure valve stem, and a part of the compressed air supplied into the feed cylinder via the contact valve is added to the increased pressure valve valve. 2. A nail supply mechanism for a nailing machine according to claim 1, wherein said nail supply mechanism is introduced into a cylinder so that said piston engages with said additional-strike valve stem to make intermittent operation impossible. 4. The contact valve spring biases a contact valve stem housed in a contact valve cylinder to a non-actuated position, and when the contact valve moves to the actuated position in conjunction with the operation of the contact member, the trigger is actuated. The nail supply mechanism for a nailing machine according to claim 1, wherein the compressed air passing through the valve is self-held in an operating position, and a play portion is formed in the engagement between the contact valve stem and the contact member. .