JP2020131391A - Pneumatic tool - Google Patents

Abstract

To provide a pneumatic tool which can achieve control of the operation timing by an electromagnetic valve without significantly deteriorating assemblability and maintainability.SOLUTION: A pneumatic tool includes: a drive mechanism 13 operated by pneumatic pressure of compressed air; an electromagnetic valve 32 for controlling supply of compressed air to the drive mechanism 13; a control board 34 which controls operation of the electromagnetic valve 32; and a power source supply terminal 35 for receiving supply of a power source. The electromagnetic valve 32 and the control board 34 are unitized and formed into a control unit 31 and the control unit 31 is integrally attached to or detached from a tool body 11.SELECTED DRAWING: Figure 7

Description

The present invention relates to a pneumatic tool operated by the air pressure of compressed air, and more particularly to a pneumatic tool using a solenoid valve.

Various tools are widely and generally used as pneumatic tools operated by the air pressure of compressed air. For example, a nail gun that drives a nail by shockingly operating the piston by the pressure of the compressed air in which compressed air suddenly flows into the upper part of the piston when the trigger is pulled is put into practical use. In such a nail gun, the contact member as a safety device slides by pressing the nose portion against the material to be driven, and the nail is ejected when the trigger is operated with the contact member sliding. ing.

However, in such a nail gun, the valve is mechanically operated when the contact member or the trigger moves to a predetermined position, and the inflow path of the compressed air is switched. For this reason, the inflow timing of compressed air is affected by how the contact members and triggers are arranged and the speed at which the operator operates the contact members and triggers, making it difficult to control the timing of driving. There was a problem that it was. For example, in the case of so-called "contact driving" in which a contact member is pressed against a material to be driven and a nail is driven while the trigger is pulled, the operator depends on how far the contact member is pushed to drive the nail. The way you feel the reaction and workability will change. In order to improve the feeling and workability of such workers, there was a request to finely control the timing at which the machine operates.

In order to satisfy such a demand, for example, it is conceivable to use a solenoid valve as described in Patent Document 1. That is, if a solenoid valve electrically operated by the switch is used, the machine operates at the moment when the switch is pressed, so that the operation timing of the machine can be easily controlled.

Japanese Patent No. 3287172

Here, when a solenoid valve is used for a pneumatic tool as described in Patent Document 1, it is necessary to add an electric component such as a solenoid valve or a control board to the conventional pneumatic tool. However, at present, no solution has been found for the method of arranging and wiring electrical parts, and it has been difficult to realize a pneumatic tool using a solenoid valve.

For example, there is a problem that the ease of assembly and maintainability are remarkably deteriorated depending on the arrangement and wiring method of electrical parts. In addition, since the structure of the existing pneumatic tool that does not use electric parts is significantly changed, there is a problem that the production efficiency is lowered and the cost is increased.

Therefore, an object of the present invention is to provide a pneumatic tool capable of controlling the operation timing by a solenoid valve without significantly deteriorating the ease of assembly and maintainability.

The present invention has been made to solve the above-mentioned problems, and is a drive mechanism operated by the air pressure of compressed air, a solenoid valve for controlling the supply of compressed air to the drive mechanism, and the solenoid valve. A control board for controlling the operation of the above and a power supply terminal for receiving power supply are provided, and the solenoid valve and the control board are unitized to form a control unit, and the control unit is attached to a tool body. It is characterized by being integrally removable.

The present invention is as described above, and includes a solenoid valve for controlling the supply of compressed air to the drive mechanism. Therefore, since the supply of compressed air is electrically controlled by the solenoid valve, the timing control of the drive mechanism becomes easy. Further, the solenoid valve and the control board are unitized to form a control unit, and the control unit can be integrally attached to and detached from the tool body. Therefore, since the electric parts can be unitized and attached / detached, the assembling property and maintainability can be improved. For example, since it is not necessary to wire electric parts in the main body, it is possible to avoid troublesome assembly and trouble of disconnection.

It is an external view of a pneumatic tool. It is sectional drawing of the solenoid valve, (a) the view which the solenoid valve is closed state, (b) the figure which the solenoid valve is open state. It is sectional drawing of the pneumatic tool before the drive mechanism operates. It is a partially enlarged sectional view of a pneumatic tool before the drive mechanism operates. It is sectional drawing of the pneumatic tool in which a drive mechanism is operating. It is a partially enlarged sectional view of a pneumatic tool in which a drive mechanism is operating. It is sectional drawing of the pneumatic tool which removed the control unit and the start-up unit. It is the figure which concerns on the modification 1, and is the sectional view of the tool body. It is the figure which concerns on the modification 1, (a) is the sectional view of the control unit, (b) is the sectional view of the air type control unit. It is a figure which concerns on the modification 1, and is the sectional view of the pneumatic tool to which the control unit is attached. It is a figure which concerns on the modification 1, and is the sectional view of the pneumatic tool to which the pneumatic control unit is attached. It is a figure which concerns on the modification 2, and is the sectional view of the pneumatic tool which uses an external power source.

An embodiment of the present invention will be described with reference to the drawings. In the following description, the nail launching direction (downward in FIG. 3) is downward, the direction opposite to the downward direction (upward in FIG. 3) is upward, and the extension direction D1 of the grip housing 25 is viewed. The direction of the body housing 12 (left direction in FIG. 3) will be described as the front direction, and the direction opposite to the front direction (right direction in FIG. 3) will be described as the rear direction.

The pneumatic tool 10 according to the present embodiment is operated by the air pressure of compressed air supplied from the outside, and is, for example, a nail gun as shown in FIG. In the present embodiment, the nail gun will be described as an example of the pneumatic tool 10, but the pneumatic tool 10 is not limited to the nail gun and may be another tool. For example, it may be a tool such as a screw fastening machine operated by compressed air.

As shown in FIG. 1, the pneumatic tool 10 includes a tool body 11 in which a grip housing 25 is connected substantially perpendicular to the body housing 12.

The body housing 12 is a tubular member that houses the drive mechanism 13 inside. A nose portion 20 that is pressed against the material to be driven is provided at the tip portion of the body housing 12. A magazine 23 accommodating the connecting nails is connected to the nose portion 20, and the leading nail of the connecting nails loaded in the magazine 23 is supplied to the nose portion 20 by the supply device. .. When the drive mechanism 13 is activated, the nail supplied to the nose portion 20 is ejected from the injection port 20a provided at the tip of the nose portion 20 by the driver 16 described later.

A contact member 21 slidable in the nail launching direction is attached to the nose portion 20. The contact member 21 is urged so as to protrude from the nose portion 20 in a natural state, and when the nose portion 20 is pressed against the material to be driven, the contact member 21 is pushed inward and slides. .. When the contact member 21 slides, the contact arm 22 connected to the contact member 21 slides integrally. As shown in FIGS. 4 and 6, the contact arm 22 extends to a position where the contact switch 43, which will be described later, can be pressed. Therefore, when the contact member 21 is pushed in and the contact arm 22 slides, the contact arm 22 pushes the contact switch 43, whereby it is detected that the nose portion 20 is pressed against the material to be driven. It has become.

As shown in FIGS. 3 and 5, the drive mechanism 13 according to the present embodiment operates by sliding the piston 15 by the air pressure of compressed air. The piston 15 is slidably arranged in the cylinder 14 so as to shockably slide in the direction of the nose portion 20 when compressed air flows into the upper part of the piston 15. A driver 16 that slides integrally with the piston 15 is connected to the lower portion of the piston 15. The driver 16 is slidably arranged in the nose portion 20, and is capable of launching a nail waiting in the nose portion 20 in the direction of the injection port 20a.

The inflow of compressed air for operating the piston 15 described above is controlled by a head valve 17 arranged so as to cover the upper opening of the cylinder 14. When the drive mechanism 13 is not operating, as shown in FIG. 3, the head valve 17 is located below to prevent the inflow of compressed air to the upper part of the piston 15. On the other hand, when the drive mechanism 13 is activated, as shown in FIG. 5, the head valve 17 moves upward to communicate the cylinder 14 with the main chamber 26 (described later), and compressed air flows into the upper part of the piston 15. It has become like. When the compressed air flows into the upper part of the piston 15, the piston 15 shockably slides downward due to the pressure of the compressed air, and the nail is driven out by the driver 16 connected to the piston 15.

The grip housing 25 connected to the body housing 12 is formed in a rod shape so that an operator can grip it. Further, an operation unit 44 that can be pulled by the index finger is provided at a position where the index finger of the operator touches when the operator grips the grip housing 25. When the operation unit 44 is operated, the solenoid valve switch 41 arranged in parallel with the drive mechanism 13 is turned on, and an operation signal is output to the control board 34 described later. The control board 34 uses this operation signal as a trigger to operate the solenoid valve 32 described later.

The inside of the grip housing 25 is a space as shown in FIG. 3, and a main chamber 26 for storing compressed air is formed by this space. Compressed air supplied from the outside is stored in the main chamber 26 and used for nail punching and the like.

A grip end member 30 that closes the main chamber 26 is attached to the rear end of the grip housing 25 (the end opposite to the body housing 12). The grip end member 30 is detachably provided with respect to the grip housing 25. The grip end member 30 is provided with a pipe joint 30a to which the plug 56 of the hose 55 can be attached and detached. Compressed air can be supplied to the main chamber 26 by connecting a hose 55 connected to an external air supply source (air compressor or the like) to the pipe joint 30a.

In the present embodiment, the control unit 31 is integrally attached to the grip end member 30. The control unit 31 is for controlling the drive mechanism 13, and as shown in FIG. 3, the solenoid valve 32, the valve stem 33, the control board 34, the power supply terminal 35, the electric connecting rod 38, and the like. , Is equipped. The control unit 31 may include at least a solenoid valve 32, a control board 34, and a power supply terminal 35, and the remaining configurations can be appropriately changed in consideration of component arrangement and the like.

The solenoid valve 32 is for controlling the supply of compressed air to the drive mechanism 13. As shown in FIG. 2, the solenoid valve 32 includes a coil 32a, a fixed iron core 32b, a movable iron core 32c, and an air flow path 32e.

The air flow path 32e is for passing compressed air inside the solenoid valve 32. The air inlet 32f, which is an opening on the upstream side of the air flow path 32e, communicates with the main chamber 26. Therefore, the compressed air stored in the main chamber 26 is always supplied to the air inlet 32f. Further, the air outlet 32g, which is an opening on the downstream side of the air flow path 32e, communicates with the stem cylinder 33b, which will be described later. Further, a path communicating with the exhaust port 32h is formed so as to branch off from the air flow path 32e. The exhaust port 32h is formed so as to communicate with the outside (atmosphere) of the pneumatic tool 10.

In a state where no current is flowing through the coil 32a, as shown in FIG. 2A, the movable iron core 32c is urged by a spring in a direction away from the fixed iron core 32b, whereby the movable iron core 32c is interlocked with the movable iron core 32c. The valve body 32d closes the air flow path 32e. In this closed state, the compressed air supplied from the upstream air inlet 32f is not supplied to the downstream air outlet 32g.

On the other hand, when a current flows through the coil 32a, as shown in FIG. 2B, the movable iron core 32c moves in the direction of approaching the fixed core 32b against the urging force of the spring. As a result, the valve body 32d moves in conjunction with the movable iron core 32c, and the air flow path 32e is moved to the open state. In this open state, the compressed air supplied from the upstream air inlet 32f is supplied to the downstream air outlet 32g. The air outlet 32g communicates with the stem cylinder 33b described later, and the compressed air supplied from the air outlet 32g to the stem cylinder 33b is used to move the valve stem 33.

When the current stops flowing through the coil 32a and the coil 32a returns from the open state to the closed state, the movable iron core 32c returns in the direction away from the fixed core 32b by the spring, as shown in FIG. 2A. As a result, the air flow path 32e is closed, and the air outlet 32g and the exhaust port 32h communicate with each other. Therefore, the compressed air supplied to the stem cylinder 33b side is released from the exhaust port 32h. As a result, the air pressure inside the stem cylinder 33b drops, and the valve stem 33, which has been sliding under the pressure of compressed air, returns to its original position.

The valve stem 33 is a rod-shaped member provided so as to project from the grip end member 30. When the grip end member 30 is attached to the grip housing 25, the valve stem 33 is arranged inside the grip housing 25 along the extending direction D1 of the grip housing 25. The valve stem 33 is slidably supported in the longitudinal direction of the grip housing 25, and operates in conjunction with the solenoid valve 32 depending on the presence or absence of compressed air supplied from the solenoid valve 32.

Specifically, the valve stem 33 according to the present embodiment includes a stem piston 33a on the rear end side (grip end member 30 side). The stem piston 33a is slidably arranged inside the stem cylinder 33b fixed to the grip end member 30. As described above, when the solenoid valve 32 is turned on (open state) and compressed air is supplied into the stem cylinder 33b, the stem piston 33a is pressed by the pressure of the compressed air, and the valve stem 33 is the body housing 12 It is configured to slide in the direction of. When the solenoid valve 32 is off (closed state), that is, when compressed air is not supplied to the stem cylinder 33b, the pressure due to the compressed air does not work, so that the valve stem 33 is urged by the spring to grip. It is configured to stand by on the end member 30 side.

On the tip end side (body housing 12 side) of the valve stem 33, an air switching portion 33c that functions as a valve for switching the supply path of compressed air is provided. The air switching portion 33c moves from the standby position shown in FIGS. 3 and 4 to the operating position shown in FIGS. 5 and 6 by moving the valve stem 33 in the extending direction D1 of the grip housing 25 as described above. It is designed to move. By moving the air switching unit 33c in this way, the operation of the head valve 17 described above is controlled.

Specifically, the pneumatic tool 10 according to the present embodiment includes a pilot valve 42 for controlling the movement of the head valve 17. The pilot valve 42 operates in conjunction with the solenoid valve 32 in order to switch the flow path of the compressed air, and is provided between the upper space P2 of the head valve 17 and the main chamber 26.

As shown in FIG. 4, when the air switching portion 33c is in the standby position, the lower space P4 of the pilot valve 42 communicates with the main chamber 26 at the position shown in P5, so that the air switching portion 33c is compressed into the lower space P4 of the pilot valve 42. Air has flowed in, and the pressure of the compressed air has moved the pilot valve 42 upward (compressed air is supplied above and below the pilot valve 42, but the force that pushes up the pilot valve 42 due to the difference in the pressure receiving area. Is set to be large). In the state where the pilot valve 42 is moved upward in this way, the upper space P2 of the head valve 17 and the main chamber 26 communicate with each other at the position shown in P3, and the upper space P2 of the head valve 17 and the exhaust path P1 are cut off. Has been done. Therefore, compressed air flows into the upper space P2 of the head valve 17, and the head valve 17 is moved downward by the pressure of the compressed air (compressed air is supplied above and below the head valve 17, but the pressure receiving area is increased. The force that pushes down the head valve 17 is set to be greater by the difference). When the head valve 17 is moved downward, the inflow of compressed air to the upper part of the piston 15 is blocked, so that the drive mechanism 13 does not operate.

On the other hand, as shown in FIG. 6, when the air switching portion 33c moves to the operating position, the lower space P4 of the pilot valve 42 is cut off from the main chamber 26 at the position shown in P5, and the lower space P4 of the pilot valve 42 is cut off. Communicates with the exhaust path P6. Therefore, the compressed air in the lower space P4 of the pilot valve 42 is exhausted from the exhaust path P6, and the air pressure in the lower space P4 of the pilot valve 42 drops. When the air pressure in the lower space P4 of the pilot valve 42 drops, the pilot valve 42 moves downward due to the pressure difference between the top and bottom of the pilot valve 42. When the pilot valve 42 moves downward in this way, as shown in P3, the upper space P2 of the head valve 17 and the main chamber 26 are shut off, and the upper space P2 of the head valve 17 and the exhaust path P1 communicate with each other. .. Therefore, the compressed air in the upper space P2 of the head valve 17 is exhausted from the exhaust path P1, and the air pressure in the upper space P2 of the head valve 17 drops. When the air pressure in the upper space P2 of the head valve 17 drops, the head valve 17 moves upward due to the pressure difference between the top and bottom of the head valve 17. When the head valve 17 moves upward, compressed air suddenly flows into the upper part of the piston 15 and the drive mechanism 13 operates.

As described above, in the present embodiment, the valve stem 33, the pilot valve 42, and the head valve 17 are sequentially operated in conjunction with the operation of the solenoid valve 32, and the drive mechanism 13 is configured to operate. .. Further, by moving the valve stem 33 in the longitudinal direction of the grip housing 25, the supply of compressed air to the drive mechanism 13 is executed. Therefore, even when the solenoid valve 32 and the drive mechanism 13 are arranged at both ends of the grip housing 25, the solenoid valve 32 is configured to control the operation timing of the drive mechanism 13.

The control board 34 is for controlling the operation of electric components such as the solenoid valve 32. The control board 34 includes a circuit for executing processing by using an input of an electric signal as a trigger. In the present embodiment, the solenoid valve switch 41 and the contact switch 43 are connected to the input side of the control board 34. A solenoid valve 32 is connected to the output side of the control board 34. When the control board 34 detects that both the solenoid valve switch 41 and the contact switch 43 are turned on, the control board 34 controls to switch the solenoid valve 32 on by passing a current through the coil 32a of the solenoid valve 32. It is configured to run.

The power supply terminal 35 is a terminal for receiving power supply, and is for connecting a power supply that supplies power to electrical components such as a control board 34 and a solenoid valve 32. Since the pneumatic tool 10 according to the present embodiment is driven by the battery 36, the power supply terminal 35 according to the present embodiment is configured as a terminal for connecting the battery 36. For example, as shown in FIG. 3, a power supply terminal 35 is provided inside the case accommodating the battery 36, and when the battery 36 is accommodated in the case, the terminal of the battery 36 and the power supply terminal 35 are electrically connected. You may do so. It goes without saying that the shape of the power supply terminal 35 is not limited to the mode shown in FIG. 3, and various conventionally known shapes can be used.

The electric connecting rod 38 is a rod-shaped member provided so as to project from the grip end member 30 substantially in parallel with the valve stem 33 described above. The electric connecting rod 38 is arranged inside the grip housing 25 along the extending direction D1 of the grip housing 25 when the grip end member 30 is attached to the grip housing 25.

The electric connecting rod 38 is capable of conducting electricity and is electrically connected to the battery 36 and the control board 34 at the rear end. Further, as shown in FIG. 7, a contact portion 38a is provided at the tip of the electric connecting rod 38. The contact portion 38a is a terminal that can be used for supplying electric power to the activation unit 40, which will be described later, and for exchanging an electric signal with the activation unit 40. By connecting the contact portion 38a to the activation unit 40, the solenoid valve switch 41 and the contact switch 43 are electrically connected to the battery 36 and the control board 34. That is, it is possible for the control board 34 to detect the pressing of the solenoid valve switch 41 and the contact switch 43. As described above, in the present embodiment, the electric components can be connected to each other without wiring.

As shown in FIG. 7, the above-mentioned parts such as the solenoid valve 32, the valve stem 33, the control board 34, the power supply terminal 35, and the electric connecting rod 38 are unitized to form the control unit 31. The control unit 31 is integrally removable from the tool body 11. That is, the control unit 31 can be attached to the tool body 11 simply by attaching the grip end member 30 to the end of the grip housing 25.

In the present embodiment, apart from the control unit 31, a start-up unit 40 in which parts related to the operation unit 44 are unitized is provided. As shown in FIG. 7, the activation unit 40 according to the present embodiment includes a solenoid valve switch 41, a pilot valve 42, a contact switch 43, and an operation unit 44. The start-up unit 40 may include at least a solenoid valve switch 41 and a pilot valve 42, and the remaining configurations can be appropriately changed in consideration of component arrangement and the like.

The solenoid valve switch 41 and the contact switch 43 are microswitches for switching the open / closed state of the solenoid valve 32, and as described above, when both the solenoid valve switch 41 and the contact switch 43 are turned on. The solenoid valve 32 is controlled to be turned on (open state).

As shown in FIG. 4, the operation unit 44 according to the present embodiment is provided in the start-up unit 40 so as to be swingable around the swing shaft 44a. The operation unit 44 is configured to swing when pulled by an operator and press the solenoid valve switch 41. Specifically, as shown in FIG. 6, when the operator pulls the operation portion 44 with a finger, the pressing portion 44b at the tip of the operation portion 44 pushes down the rod-shaped driven member 45. Since the driven member 45 is arranged so that the tip of the driven member 45 faces the solenoid valve switch 41, the solenoid valve switch 41 is pressed by the tip of the driven member 45.

As shown in FIG. 7, the activation unit 40 is provided with a stem connecting portion 46 and a rod connecting portion 47.

The stem connecting portion 46 is for inserting and connecting the tip of the valve stem 33. By inserting the tip of the valve stem 33 (air switching portion 33c) into the stem connecting portion 46, the air switching portion 33c can be incorporated into the air path inside the activation unit 40. As a result, the valve stem 33 can be incorporated into the drive mechanism 13 side without using screws or the like. Further, even though the solenoid valve 32 is arranged on the grip end member 30 side, the drive mechanism 13 can be operated in conjunction with the solenoid valve 32. Further, when removing the control unit 31, it is only necessary to pull out the valve stem 33 from the stem connecting portion 46, so that the maintenance work is also easy.

Further, the rod connecting portion 47 is for inserting and connecting the tip of the electric connecting rod 38. By inserting the tip (contact portion 38a) of the electric connecting rod 38 into the rod connecting portion 47, the starting unit 40 and the control unit 31 are electrically connected. As a result, electrical components such as the solenoid valve switch 41 can be connected to the power supply and the control board 34 without using wiring. Further, even though the control board 34 and the power supply terminal 35 are arranged on the grip end member 30, the solenoid valve 32 can be operated by the pressing signal of the solenoid valve switch 41 and the contact switch 43 as a trigger. Further, when removing the control unit 31, it is only necessary to pull out the electric connecting rod 38 from the rod connecting portion 47, so that the maintenance work is also easy.

The activation unit 40 is integrally removable from the tool body 11. That is, all the parts constituting the activation unit 40 can be attached to the tool body 11 by simply attaching the activation unit 40 to the opening formed below the grip housing 25. The mounting direction of the starting unit 40 is formed so as to be orthogonal to the mounting direction of the control unit 31 (extending direction D1 of the grip housing 25). Then, after the starting unit 40 is attached to the tool body 11, the control unit 31 is attached to the tool body 11 and the stem connecting portion 46 and the rod connecting portion 47, and the tip of the valve stem 33 and the tip of the electric connecting rod 38 are attached to the stem connecting portion 46 and the rod connecting portion 47. Is to be inserted.

As described above, in the present embodiment, the control unit 31 and the start-up unit 40 can be individually attached to the tool body 11, and can be connected to each other inside the tool body 11. Since the control unit 31 and the activation unit 40 can be easily connected, disassembly and assembly are easy.

As described above, the pneumatic tool 10 according to the present embodiment includes a solenoid valve 32 for controlling the supply of compressed air to the drive mechanism 13. Therefore, since the supply of compressed air is electrically controlled by the solenoid valve 32, the timing control of the drive mechanism 13 becomes easy.

In the present embodiment, the solenoid valve 32 for switching the supply of compressed air to the drive mechanism 13 on / off is provided, but the present invention is not limited to this, and the valve body 32d can be controlled at an intermediate position between on / off. Solenoid valve 32 (proportional valve) may be used. Since the flow rate can be adjusted by using such a solenoid valve 32, the output can be adjusted by adjusting the filling speed of the compressed air.

Further, the solenoid valve 32, the control board 34, and the power supply terminal 35 are unitized to form the control unit 31, and the control unit 31 can be integrally attached to and detached from the tool body 11. Therefore, since the electric parts can be unitized and attached / detached, the assembling property and maintainability can be improved. For example, since it is not necessary to wire electric parts in the main body, it is possible to avoid troublesome assembly and trouble of disconnection.

Further, since the control unit 31 is attached to the grip end member 30, the control unit 31 can be attached and detached integrally with the grip end member 30, and the assembleability and maintainability can be improved.

Further, the solenoid valve switch 41 for switching the open / closed state of the solenoid valve 32 and the pilot valve 42 which operates in conjunction with the solenoid valve 32 for switching the flow path of the compressed air are unitized to form the start unit 40. Since the start-up unit 40 is integrally removable from the tool body 11, the assembling property and maintainability can be further improved.

(Modification example 1)
The first modification will be described with reference to FIGS. 8 to 11. Since the basic configuration of this modification is not different from that of the above-described embodiment, only the differences will be described while avoiding duplicate descriptions.

In the above-described embodiment, the activation unit 40 is provided separately from the control unit 31, but the present invention is not limited to this, and the activation unit 40 is not provided (or the control unit 31 is provided with the function of the activation unit 40). It may be.

Specifically, in this modified example, as shown in FIG. 8, the operation unit 44 is swingably attached to the tool body 11. Further, a contact lever 48 is attached to the inside of the operation unit 44, and a slider 27 is attached so as to face the contact lever 48.

The contact lever 48 is a member that is swingably attached to the inside of the operation unit 44. One end of the contact lever 48 is swingably attached to the operation portion 44, and the other end is arranged so as to face the tip of the contact arm 22. Therefore, when the operation unit 44 is pulled to move upward and the contact member 21 is pushed in to move the contact arm 22 upward, both ends of the contact lever 48 are lifted. By lifting both ends of the contact lever 48 in this way, the slider 27, which will be described later, is pushed into the intermediate portion.

The slider 27 is slidably attached up and down so as to face the intermediate portion of the contact lever 48 described above. The slider 27 is urged so as to protrude downward by a spring or the like in a natural state, and is pushed upward by the contact lever 48 only when the operation portion 44 and the contact member 21 are operated at the same time. It is configured to move to.

FIG. 9A shows a control unit 31 that can be attached to and detached from the tool body 11. The control unit 31 includes a solenoid valve 32, a control board 34, a power supply terminal 35, a solenoid valve switch 41, and a pilot valve 42. When the control unit 31 is attached to the tool body 11, it becomes a pneumatic tool 10 as shown in FIG.

In the pneumatic tool 10 shown in FIG. 10, the solenoid valve switch 41 is arranged so as to be located above the slider 27. Therefore, when the contact member 21 and the operation unit 44 are operated and the slider 27 slides upward, the solenoid valve switch 41 is pressed by the slider 27 that slides upward. When the control board 34 detects that the solenoid valve switch 41 has been pressed, the control board 34 supplies an electric current to the solenoid valve 32 to operate the solenoid valve 32. When the solenoid valve 32 operates, the pilot valve 42 and the head valve 17 operate in the same manner as in the above-described embodiment, so that the drive mechanism 13 operates and the driving operation is executed.

Even with such a configuration, the ease of assembly and maintainability can be improved as in the above-described embodiment.

As shown in FIG. 9B, the pneumatic tool 10 according to this modification includes a pneumatic control unit 50 that replaces the control unit 31. The pneumatic control unit 50 includes a trigger valve 51 that operates mechanically instead of the solenoid valve 32. By attaching the pneumatic control unit 50 to the tool body 11 instead of the control unit 31 described above, the pneumatic tool 10 as shown in FIG. 11 is obtained. The pneumatic tool 10 shown in FIG. 11 can operate the drive mechanism 13 without using electricity.

That is, in the pneumatic tool 10 shown in FIG. 11, the trigger valve 51 is arranged so as to be located above the slider 27. Therefore, when the contact member 21 and the operation unit 44 are operated and the slider 27 slides upward, the trigger valve 51 is pushed up by the slider 27 that slides upward. Then, when the trigger valve 51 is pushed up, the compressed air pressing the pilot valve 42 is exhausted, so that the pilot valve 42 operates. Since the head valve 17 is operated by the operation of the pilot valve 42, the drive mechanism 13 is operated to execute the driving operation.

As described above, according to the present embodiment, the pneumatic tool 10 that does not use electricity can be obtained by simply attaching different control units 31 to the same tool body 11, or the pneumatic tool 10 that uses electricity. You can also do it. Therefore, in manufacturing the two different types of pneumatic tools 10, it is possible to standardize the parts, improve the production efficiency, and reduce the cost.

(Modification 2)
In the above-described embodiment, the mode in which the pneumatic tool 10 is driven by the battery 36 has been described, but the present invention is not limited to this, and the pneumatic tool 10 may be operated by an external power source.

That is, the power supply terminal 35 according to the above-described embodiment was for connecting the battery 36, but instead, as shown in FIG. 12, a power cable 58 connected to an external power source can be connected. Power supply terminal 35 may be provided.

10 Pneumatic tool 11 Tool body 12 Body housing 13 Drive mechanism 14 Cylinder 15 Piston 16 Driver 17 Head valve 20 Nose part 20a Exit 21 Contact member 22 Contact arm 23 Magazine 25 Grip housing 26 Main chamber 27 Slider 30 Grip end member 30a Pipe joint 31 Control unit 32 Solenoid valve 32a Coil 32b Fixed iron core 32c Movable iron core 32d Valve body 32e Air flow path 32f Air inlet 32g Air outlet 32h Exhaust port 33 Valve stem 33a Stem piston 33b Stem cylinder 33c Air switching part 34 Power supply terminal 36 Battery 38 Electric connecting rod 38a Contact part 40 Start unit 41 Solenoid valve switch 42 Piston valve 43 Contact switch 44 Operation part 44a Swing shaft 44b Pressing part 45 Driven member 46 Stem connection part 47 Rod connection part 48 Contact lever 50 Pneumatic control unit 51 Trigger valve 55 Hose 56 Plug 58 Power cable D1 Extension direction of grip housing

Claims (5)

A drive mechanism operated by the air pressure of compressed air,
A solenoid valve for controlling the supply of compressed air to the drive mechanism,
A control board that controls the operation of the solenoid valve,
Power supply terminal for receiving power supply and
With
A pneumatic tool characterized in that the solenoid valve and the control board are unitized to form a control unit, and the control unit can be integrally attached to and detached from a tool body. Equipped with a grip housing formed so that the operator can grip it
A main chamber for storing compressed air is formed in the grip housing, and a grip end member for closing the main chamber is attached to an end portion of the grip housing.
The pneumatic tool according to claim 1, wherein the control unit is attached to the grip end member. A solenoid valve switch for switching the open / closed state of the solenoid valve,
A pilot valve that operates in conjunction with the solenoid valve to switch the flow path of compressed air,
The pneumatic tool according to claim 1 or 2, wherein the activation unit is formed into a unit, and the activation unit can be integrally attached to and detached from the tool body. The pneumatic tool according to claim 3, wherein the control unit and the activation unit can be individually attached to the tool body and can be connected to each other inside the tool body. An pneumatic control unit that replaces the control unit is provided.
The pneumatic control unit includes a mechanically actuated trigger valve in place of the solenoid valve.
The present invention according to any one of claims 1 to 4, wherein the drive mechanism can be operated without using electricity by attaching the pneumatic control unit to the tool body instead of the control unit. Pneumatic tool described.

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