JP2012056068A - Air tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air tool in which compressed air to be sent from an external compressed air source is utilized and to which an air duster is added with a structure where the pressure in a pressure accumulation chamber is not decreased and a check valve is not arranged.SOLUTION: In a screw driving machine 10, high-pressure compressed air is sent from an external compressor. The screw driving machine 10 includes a pressure regulating valve 40 for decompressing the sent high-pressure compressed air and sending the decompressed air to the pressure accumulation chamber 32. The air duster 60 is arranged on the rear side of the pressure regulating valve 40. The air duster 60 includes: an opening and closing valve 61 for stopping the high-pressure compressed air; and an operation part 75 for releasing the stopped state of the opening and closing valve 61 and jetting the high-pressure compressed air to the outside. Here, the inflow port 73 of the opening and closing valve 61 is arranged on the upstream side of the compressed air flow having higher pressure than that of the inside of a pressure regulation chamber of the pressure regulating valve 40 so that the high-pressure compressed air before decompression by the pressure regulating valve 40 is made to flow in the inflow port.

Description

  The present invention relates to an air tool that uses compressed air sent from an external compressed air source.

2. Description of the Related Art Conventionally, air tools that use compressed air to drive or rotate nails, screws, screws, and the like are known. This type of air tool generally includes a pressure accumulating chamber (air chamber) that stores compressed air, and a drive mechanism that is driven by the compressed air stored in the pressure accumulating chamber.
By the way, in such an air tool, what is constituted by adding a mechanism called an air duster that blows off wood chips, dust and the like as disclosed in Patent Document 1 below is known. . In the air tool disclosed in Patent Document 1, a check valve is provided on the upstream side of the pressure accumulating chamber, and an air duster on / off valve is provided in an upstream air passage defined by the check valve. . For this reason, when this air duster on-off valve is closed, compressed air is supplied from an external compressed air source to the pressure accumulating chamber through a check valve. On the other hand, when the air duster on-off valve is open, compressed air is blown out from the blowout port connected to the upstream air passage while the check valve prevents the backflow from the pressure accumulating chamber. It is like that. According to the air tool disclosed in Patent Document 1, when the air duster on-off valve is opened and compressed air can be blown out from the outlet, the presence of the check valve does not cause a pressure drop in the pressure accumulating chamber.

JP 2010-82735 A

  However, as described above, when an air duster is added to an air tool without causing a pressure drop in the pressure accumulating chamber, it is necessary to provide a check valve. If it does so, the structure as the whole air tool will become complicated.

  This invention is made | formed in view of such a situation, Comprising: The subject which this invention tends to solve is a pneumatic tool using the compressed air sent from an external compressed air source. It is to add an air duster with a structure that does not invite and does not provide a check valve.

In order to solve the above-described problems, the air tool according to the present invention employs the following means.
That is, an air tool according to a first aspect of the present invention includes a drive mechanism that drives using compressed air as a drive source, a pressure accumulation chamber that stores compressed air that serves as the drive source, and a compression chamber that compresses the pressure accumulation chamber from the compressed air source. An air tool provided with a pressure regulating valve that depressurizes compressed air sent from the compressed air source when supplying air, wherein an air duster opening / closing valve is provided upstream of the pressure regulating valve. And Note that the upstream side of the pressure regulating valve is used to mean an upstream side air passage partitioned by the pressure regulating valve.
According to the air tool of the first aspect of the present invention, since the on / off valve for the air duster is provided on the upstream side of the pressure regulating valve, when the on / off valve for the air duster is opened, the compressed air is decompressed. The pressure valve automatically functions as a check valve. That is, the inventor of the present invention widely uses a pressure regulating valve for reducing high pressure (for example, an atmospheric pressure of 20 kgf / cm ² ) compressed from a compressed air source to normal pressure (for example, an atmospheric pressure of 8 kgf / cm ² ). Has been devised to provide an open / close valve for the air duster upstream of the pressure regulating valve.
As a result, when the open / close valve for the air duster is opened, the upstream side air passage and the air outlet for the air duster communicate with each other, and the high pressure compressed air sent from the compressed air source is blown out from the air duster outlet. Can be made. At this time, the pressure regulating valve for reducing the pressure as described above functions as a check valve, so that the pressure in the pressure accumulating chamber for storing the compressed air at the normal pressure serving as the driving source is not reduced. Thus, according to the air tool of the first aspect of the present invention, the air duster can be added with a structure in which the check valve is not provided without causing a pressure drop in the pressure accumulating chamber.

An air tool according to a second invention is characterized in that, in the air tool according to the first invention, the drive mechanism has a function of driving out a screw and a function of screwing the screw. To do.
According to the air tool of the second aspect of the present invention, since it is configured as a screw driving machine for driving out a screw or screwing the screw, it deals with a problem that chips such as wood chips unique to the screw driving machine are easily generated. be able to. That is, chips generated when a screw is driven or a screw is screwed can be blown away by the added air duster. That is, according to this air tool, the function of the air duster can be utilized more effectively.

According to the air tool concerning the 1st invention, an air duster can be added by the structure which does not cause the pressure fall of a pressure accumulation chamber, and does not provide a check valve.
According to the air tool concerning the 2nd invention, the function of an air duster can be used more effectively.

It is sectional drawing which shows the internal structure of a screwdriver. It is an expanded sectional view regarding a pressure regulation valve and an air duster. It is the expanded sectional view which expanded further the pressure regulation valve (closed state) shown in FIG. It is an expanded sectional view in which the pressure regulating valve shown in FIG. It is the expanded sectional view which expanded further the air duster (state before operation) shown in FIG. FIG. 6 is an enlarged cross-sectional view in which the air duster shown in FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for implementing an air tool according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the internal structure of a screw driving machine 10 as an air tool according to the present invention. 2 to 6 including FIG. 1, the left side in the figure is the front side (tip side) that coincides with the direction in which the screw is driven, and the upper side in the figure is gripped by the user. The upper side coincides with the direction of the state. On the other hand, the right side in the figure is the rear side (rear end side), and the lower side in the figure is the lower side.
This screw driving machine 10 drives a screw so that it can be screwed, and is configured in a pistol shape simulating a pistol as shown in the figure. The screw driving machine 10 generally includes a drive mechanism unit 11, a nozzle unit 21, and a handle unit 31.
The drive mechanism unit 11 corresponds to the drive mechanism according to the present invention, and includes a drive unit 12 having two functions: a function of driving a screw and a function of screwing a screw. In addition, the drive mechanism unit 11 includes a driver unit 13 that drives a screw by the drive unit 12 and turns the screw, and an operation trigger mechanism 14 that operates the drive unit 12. The drive mechanism unit 11 including the drive unit 12 is configured in the same manner as a widely known structure, and thus detailed description thereof is omitted.
The nozzle portion 21 is a portion to which screws from the magazine 25 are supplied. The inside of the nozzle portion 21 passes through the driver portion 13 with the supplied screw disposed at the tip. For this reason, the tip part of the nozzle part 21 is formed with a launching opening 23 through which the driver part 13 including a screw protrudes. The screws accommodated in the magazine 25 are automatically supplied from a supply path 22 formed in the lower part of the nozzle portion 21.

The handle portion 31 is disposed at the lower portion of the drive mechanism portion 11 described above, and is a hand grip portion for the user to grip the screw driving machine 10. For this reason, the handle | steering-wheel part 31 has an appropriate grip shape which can be grasped by hand. The inside of the handle portion 31 is formed as a pressure accumulation chamber (air chamber) 32 that stores compressed air. The pressure accumulating chamber 32 is formed in an appropriate space where compressed air can be stored at a low air pressure (hereinafter referred to as “normal pressure”) at which the atmospheric pressure is 8 kgf / cm ² , for example. The compressed air stored in the pressure accumulating chamber 32 serves as a drive source for driving the drive mechanism unit 11 disposed on the upper part of the handle unit 31.
The normal pressure compressed air stored in the pressure accumulating chamber 32 is supplied from the outside. That is, the compressed air supplied from the outside is coupled to the connection port 35 disposed on the lower side of the handle portion 31 opposite to the upper side of the handle portion 31 on which the drive mechanism portion 11 is disposed. It is supplied from the outside via an external hose (not shown). In addition, this connection port 35 is formed in the shape which can connect the external hose for sending compressed air. Also, high pressure compressed air compressed by an external compressor (compressed air source) is sent to the connection port 35 via a connecting hose. Incidentally, the high-pressure compressed air compressed by the external compressor is, for example, compressed air having a high air pressure (hereinafter referred to as “high pressure”) at which the atmospheric pressure becomes 20 kgf / cm ² . For this reason, as will be described in detail below, a pressure regulating valve 40 is disposed between the connection port 35 and the pressure accumulating chamber 32, and the pressure regulating valve 40 changes the above-described high-pressure compressed air to normal pressure compressed air. The pressure is reduced. In addition, an air duster 60 for blowing off wood chips and dust is disposed near the connection port 35. The pressure regulating valve 40 and the air duster 60 will be described in detail below. The high-pressure compressed air sent from the compressed air source may be sent directly from the compressor (compressed air source) or indirectly via a reserve tank (compressed air source). May be sent to.

The pressure regulating valve 40 will be described.
FIG. 2 is an enlarged cross-sectional view regarding the pressure regulating valve 40 and the air duster 60. As shown in FIG. 2, the pressure regulating valve 40 is disposed on the upper side adjacent to the connection port 35 provided at the lower portion of the handle portion 31. Specifically, an arrangement space 37 in which the pressure regulating valve 40 is arranged is provided at the lower part of the handle portion 31 located above the connection port 35. Each member constituting the pressure regulating valve 40 is arranged in the arrangement space 37. This pressure regulating valve 40 is for reducing the pressure of the high-pressure compressed air sent from the outside and sending it to the pressure accumulating chamber 32 as described above. That is, the pressure regulating valve 40 functions to reduce the high pressure compressed air to the normal pressure compressed air.
FIG. 3 is an enlarged cross-sectional view in which the pressure regulating valve shown in FIG. 2 is further enlarged. FIG. 4 is an enlarged cross-sectional view in which the pressure regulating valve shown in FIG. In addition, the pressure regulation valve 40 shown in FIG. 3 has shown the valve closed state, and the pressure regulation valve 40 shown in FIG. 4 has shown the valve open state. Moreover, the white arrow shown in FIG. 3 and FIG. 4 has shown the advancing direction of compressed air.

As shown in FIGS. 3 and 4, the pressure regulating valve 40 generally includes a support base 41, a valve body 50, a first biasing spring 47, and a second biasing spring 48.
The support base 41 is fixed to the arrangement space 37 below the handle portion 31 by screw engagement. The support base 41 supports the valve main body 50 while guiding the movement of the valve main body 50 to be described next. The support base 41 is vertically installed so that a valve base 51 of the valve main body 50 to be described next can be inserted and removed. A through-hole 42 is formed. The cylindrical portion 52 of the valve base 51 (valve body 50) is inserted into the through hole 42. An urging space chamber 44 is provided between the support base 41 and the valve base 51 so that the relative distance of the valve base 51 (valve body 50) with respect to the support base 41 can be changed. In the urging space chamber 44, a first urging spring 47 that urges the valve base 51 (valve main body 50) with respect to the support base 41 in a direction away from the support base 41 is disposed. Specifically, the first urging spring 47 is formed of a coil spring, the upper end side is in contact with the support base 41, and the lower end side is in contact with the valve base 51. The support base 41 can be screwed with respect to the arrangement space 37 to determine a relative distance from the valve main body 50, and the relative distance between the support base 41 and the valve main body 50 can be determined. It is possible to determine the urging force of the first urging spring 47 disposed between the two.
The biasing space chamber 44 is provided with an external communication hole 43 so that the air pressure in the biasing space chamber 44 does not change depending on the relative position of the valve base 51 (valve body 50) with respect to the support base 41. Yes. The external communication hole 43 communicates with the outside of the handle portion 31 so that the air pressure in the biasing space chamber 44 maintains the external air pressure regardless of the relative position of the valve base 51 (valve body 50) with respect to the support base 41. It has become. In addition, an appropriate seal member (O-ring) 49 is interposed in the inner peripheral portion and the outer peripheral portion of the support base 41 so that there is no pressure leakage from the pressure accumulating chamber 32 inside the handle portion 31 described above. Yes.

The valve main body 50 is disposed so that the valve base 51 and the valve body 55 can be integrally interlocked.
As shown in the drawing, the valve base 51 is formed as a cylindrical tubular portion 52 whose upper portion extends in the vertical direction from the middle portion while the middle portion expands in a flange shape, and the lower portion extends vertically from the middle portion. It is formed as a columnar shaft portion 53 extending in the direction. The tubular portion 52 of the valve base 51 is a portion that is inserted into the through hole 42 of the support base 41 described above. In addition, a communication hole 54 is provided in the portion of the valve base 51 where the shaft portion 53 is formed to allow the inside of the valve base 51 to communicate vertically. As described above, the urging space chamber 44 is formed between the valve base 51 and the support base 41. On the contrary, a pressure regulating pressure chamber 59 is formed between the valve base 51 and the side wall surface forming the arrangement space 37. That is, the intermediate portion of the valve base 51 between the cylindrical portion 52 and the shaft portion 53 is formed in a horizontal flange shape. Here, an appropriate seal member (O-ring) 49 is provided on the outer peripheral portion of the intermediate portion of the valve base 51 formed in the horizontal flange shape so that there is no pressure leakage from the pressure regulating pressure chamber 59. It is intervened. That is, the pressure regulating pressure chamber 59 functions as a chamber communicating with the outflow opening 45 of the pressure regulating valve 40 through the communication hole 54 of the valve base 51. For this reason, the pressure regulating pressure chamber 59 communicates with the pressure accumulating chamber 32 through the outflow opening 45, and the pressure of the compressed air in the pressure regulating pressure chamber 59 is stored in the pressure accumulating chamber 32. The pressure is the same as the pressure of the compressed air.
The shaft portion 53 is a part of the valve base 51 and is formed in a columnar shape that extends downward from an intermediate portion of the valve base 51. The lower end of the shaft portion 53 is in contact with the valve body 55 so as to be integrated with the valve body 55. As described above, a communication hole 54 is provided inside the valve base 51 where the shaft portion 53 is formed so as to communicate the inside of the valve base 51 up and down.
The valve body 55 is made of elastic rubber. The valve body 55 receives an upward biasing force by a second biasing spring 48 disposed on the lower side of the valve body 55, and comes into contact with the lower end of the shaft portion 53 described above. More specifically, the shaft portion 53 which is a part of the valve base 51 is urged downward by the first urging spring 47, and the urging force from the shaft portion 53 and the second urging spring 48 are Due to the urging force, the valve body 55 is in close contact with the lower end of the shaft portion 53, and can be integrated with the valve base 51. The second urging spring 48 is formed of a coil spring. Here, the upper surface of the valve body 55 is formed as a sealing contact surface 56. The sealing contact surface 56 is a portion formed so as to be able to contact the seating surface 57 disposed to face the sealing contact surface 56. The seat surface 57 is formed by a side wall that forms an arrangement space 37 in which the pressure regulating valve 40 is arranged.

The pressure regulating valve 40 configured as described above operates as follows.
That is, when the compressed air stored in the pressure accumulating chamber 32 has a desired normal pressure, the pressure in the pressure regulating pressure chamber 59 also becomes a normal pressure through the communication hole 54. Then, the valve base 51 including the valve body 55 is supported by the support base 41 so that the pressure of the pressure regulating pressure chamber 59 overcomes the biasing force of the first biasing spring 47 and the capacity of the pressure regulating pressure chamber 59 is maximized. It will move to the approach side (upper side). As a result, the valve main body 50 approaches the support base 41, thereby bringing the sealing contact surface 56 of the valve body 55 into contact with the seat surface 57, and the valve is closed as shown in FIG. In the valve closed state shown in FIG. 3, the flow of high-pressure compressed air entering from the connection port 35 side into the pressure accumulating chamber 32 is restricted.
On the contrary, when the compressed air stored in the pressure accumulating chamber 32 becomes a pressure smaller than a desired normal pressure, the pressure in the pressure regulating pressure chamber 59 is also smaller than the normal pressure by the communication hole 54. It becomes. Then, the valve base 51 including the valve body 55 is supported by the support base 41 so that the biasing force of the first biasing spring 47 overcomes the pressure of the pressure regulating pressure chamber 59 and the capacity of the pressure regulating pressure chamber 59 is minimized. It will be moved to the separation side (lower side). As a result, the valve main body 50 is separated from the support base 41, thereby separating the sealing contact surface 56 of the valve body 55 from the seat surface 57, and the valve is opened as shown in FIG. In the valve open state shown in FIG. 4, high-pressure compressed air that enters from the connection port 35 side can flow into the pressure accumulation chamber 32.

Next, the air duster 60 will be described.
As shown in FIG. 2, the air duster 60 is disposed on the upper side adjacent to the connection port 35 provided in the lower portion of the handle portion 31, and is disposed on the substantially adjacent rear side of the pressure regulating valve 40 described above. . Specifically, a duster arrangement space 38 in which the air duster 60 is arranged is provided on the substantially adjacent rear side of the arrangement space 37 in which the pressure regulating valve 40 is arranged. The duster installation space 38 is provided below the handle portion 31 so as to extend in the crossing direction with respect to the installation space 37 of the pressure regulating valve 40 described above. That is, the arrangement space 37 of the pressure regulating valve 40 and the duster arrangement space 38 are provided side by side in the front-rear direction.
FIG. 5 is an enlarged cross-sectional view in which the air duster 60 shown in FIG. 2 is further enlarged. FIG. 6 is an enlarged cross-sectional view of the air duster 60 shown in FIG. 5 in an operating state. Note that the air duster 60 shown in FIG. 5 shows a pre-operation state (pre-operation state) before the user operates, and the air duster 60 shown in FIG. 6 shows an operation state (operation state) operated by the user. ing.

As shown in FIGS. 5 and 6, the air duster 60 generally includes an on-off valve 61, an operation unit 75, and an injection unit 80.
The on-off valve 61 has a function of closing high-pressure compressed air sent from the outside so as to be openable and closable. The on-off valve 61 generally includes a support base 62 and a valve main body 67. The support base 62 is fixedly disposed in the duster disposition space 38 with a seal member (O-ring) 69 interposed therebetween. The support base 62 is inserted from the rear side to the front stop position, and the arrangement position in the duster arrangement space 38 does not change.
The support base 62 is formed in a substantially cylindrical shape extending in the front-rear direction. Specifically, the inside of the support base 62 is formed with an open inflow chamber 63 between the valve body 67 described below. The open inflow chamber 63 is formed such that the edge of the front end portion has a tapered shape, and a portion adjacent to the front end portion is formed as a seating surface 64. The seat surface 64 is a portion with which a sealing ring 71 provided on a valve body 67 described below abuts.
An intermediate portion of the open inflow chamber 63 is provided with an outflow opening 65 communicating with an injection unit 80 described below. Through the outflow opening 65, the inside of the support base 62 communicates with an injection section 80 (shown by a broken line) described below, and the open inflow chamber 63 inside the support base 62 in a normal state has an external pressure. It is in a state equivalent to the outside air that is the same as the atmospheric pressure. Here, when high-pressure compressed air enters the open inflow chamber 63 inside the support base 62, the high-pressure compressed air flows to the injection unit 80 through the outflow opening 65 and is injected from the injection unit 80 to the outside. It becomes.

The valve body 67 is disposed inside the support base 62 so as to be movable relative to the support base 62 described above. The valve main body 67 is in either the valve closed state (stopped state) or the valve open state, depending on the relative position with respect to the support base 62 described above. The valve main body 67 is formed in a long columnar shape, and the front end is formed as a flat pressing surface 68. The pressing surface 68 is formed so as to receive the pressure of high-pressure compressed air that enters from the connection port 35 side.
A sealing ring 71 formed of an O-ring is provided in the valve body 67 in the vicinity of the pressing surface 68 so as to be hung on the valve body 67. The sealing ring 71 is elastically deformable and is formed in a shape in which the outer periphery of the pressing surface 68 is enlarged. As shown in FIG. 5, the sealing ring 71 is brought into a valve closed state by abutting against the seat surface 64 described above. As shown in FIG. 6, when the sealing ring 71 is separated from the seat surface 64, the connection port 35 is formed in a gap formed between the seat surface 64 and the sealing ring 71. High-pressure compressed air from the side can be put into the open inflow chamber 63 described above.
Further, a dam ring 72 formed by an O-ring is hung on the valve main body 67 at a portion of the valve main body 67 positioned relatively rearward with respect to the outflow opening 65 of the support base 62 described above. Provided. Like the sealing ring 71 described above, the damming ring 72 is elastically deformable and is formed in a shape in which the outer periphery of the valve body 67 is enlarged. The blocking ring 72 functions so that the high-pressure compressed air that has entered the open inflow chamber 63 does not leak to the outside.

The operation unit 75 is provided at the rear end of the valve body 67 so as to be fixed to the valve body 67. The operation unit 75 has a function of releasing the valve closed state (stopped state) by the on-off valve 61 and ejecting high-pressure compressed air to the outside. This operation part 75 is formed in the shape of a push button, and is provided so as to be exposed to the outside. A biasing spring 78 is interposed between the operation unit 75 and the support base 62 described above. For this reason, by receiving the urging force of the urging spring 78, the valve body 67 including the operation portion 75 is urged toward the rear side (the right side in the figure). Reference numeral 79 denotes a retaining spring for retaining the operating portion 75 on the valve body 67. Reference numeral 90 denotes a protective rib that stands up around the operation unit 75 so that the operation unit 75 is not erroneously operated.
The injection portion 80 which is a broken line in the figure is a portion through which high-pressure compressed air flows through the outflow opening 65 when high-pressure compressed air enters the open inflow chamber 63 inside the support base 62 as described above. . As shown in FIG. 2, the injection unit 80 includes an injection passage 81 that communicates with the outflow opening 65 and an injection port (blow-out port) 82 that serves as a discharge port toward the outside. The injection passage 81 is formed as a thin tube extending forward from the outflow opening 65. The injection port 82 is an outlet where the injection passage 81 is opened, and is a portion from which high-pressure compressed air that has flowed out. The ejection force of the high-pressure compressed air ejected from the ejection section 80 is set by the size of the inner diameter of the ejection passage 81 and the ejection port 82.

  Here, high-pressure compressed air from the connection port 35 side is taken in from the air inlet 73 toward the on-off valve 61 configured as described above. The air inflow port 73 has a branch inflow passage 74 branched from the connection port 35 side. The upstream end of the branch inflow passage 74 is connected toward the connection port 35 side so that high-pressure compressed air before being depressurized by the pressure regulating valve 40 flows in. As a result, the air inlet 73 including the branch inflow passage 74 is arranged on the upstream side of the flow of high-pressure compressed air from the pressure regulating pressure chamber 59 of the pressure regulating valve 40. Note that the high pressure compressed air flows into the pressure regulating pressure chamber 59 of the pressure regulating valve 40 from the upstream side of the pressure regulating pressure chamber 59 and flows upstream of the pressure regulating pressure chamber 59. This means that this high-pressure compressed air flows in and acts on the pressure before acting on the inside.

The air duster 60 configured as described above operates as follows.
That is, as shown in FIG. 5, the high-pressure compressed air that has entered from the connection port 35 enters the branched inflow passage 74 (air inlet 73). The high-pressure compressed air that has entered from the branch inflow passage 74 (air inlet 73) presses the pressing surface 68 of the valve body 67 described above. On the other hand, the air pressure in the open inflow chamber 63 is an external pressure. As a result, the valve body 67 of the air duster 60 acts so as to move relatively toward the rear side (the right side in the figure) with respect to the support base 62. If it does so, the sealing ring 71 will contact | abut to the above-mentioned seat surface 64, and it will be in a valve closed state. That is, the high-pressure compressed air from the connection port 35 is restricted from flowing into the open inflow chamber 63 from the branch inflow passage 74 (air inlet 73), and the high-pressure compressed air is not injected from the injection unit 80. .
On the other hand, as shown in FIG. 6, the user turns the operation unit 75 toward the front side (the left side in the drawing) against the acting force of the high-pressure compressed air against the pressing surface 68 of the valve body 67. When pressed, it operates as follows. That is, when the operation unit 75 is pressed toward the front side, the valve main body 67 is also moved to the front side (the left side in the drawing). If it does so, the sealing ring 71 provided in the above-mentioned valve main body 67 will be located so that it may space apart from the seat surface 64 so that the contact state with the seat surface 64 may be cancelled | released. As a result, a gap is formed between the seat surface 64 and the sealing ring 71, and high-pressure compressed air from the connection port 35 flows into the open inflow chamber 63 from this gap. Thereafter, the high-pressure compressed air that has flowed into the open inflow chamber 63 flows out from the outflow opening 65 to the injection unit 80. In this way, the high-pressure compressed air is ejected from the ejection port 82 to the outside through the ejection passage 81 communicating with the outflow opening 65.

According to the screw driving machine 10 described above, the following operational effects can be achieved.
That is, according to the screw driving machine 10 described above, the on / off valve 61 for the air duster 60 is provided on the upstream side of the pressure regulating valve 40. Therefore, when the on / off valve 61 for the air duster 60 is opened, the compressed air The pressure regulating valve 40 for reducing the pressure automatically functions as a check valve. As a result, when the opening / closing valve 61 for the air duster 60 is opened, the upstream air passage and the injection port 82 for the air duster 60 communicate with each other and are sent from the connection port 35 from the injection port 82 for the air duster 60. High pressure compressed air can be blown out. At this time, since the pressure regulating valve 40 for reducing the pressure functions as a check valve as described above, the pressure in the pressure accumulating chamber 32 that stores normal pressure compressed air serving as a drive source is not reduced. Therefore, according to this screw driving machine 10, the air duster 60 can be added with a structure in which the check valve is not provided without causing a pressure drop in the pressure accumulating chamber 32.
Further, the air duster 60 described above is provided for the screw driving machine 10 that drives out a screw or turns a screw, and therefore, it is necessary to cope with a problem in which chips such as wood chips unique to the screw driving machine are easily generated. Can do. That is, chips generated when a screw is driven or a screw is screwed can be blown off by the added air duster 60. That is, the function of the air duster 60 can be utilized more effectively.

The pneumatic tool according to the present invention is not limited to the above-described embodiment of the screw driving machine 10, and may be configured by appropriately changing the location as follows.
For example, the configuration of the pressure regulating valve 40 of the above-described embodiment is merely an example, and the pressure regulating valve according to the present invention is configured to depressurize high-pressure compressed air sent from the outside and send it to the pressure accumulating chamber. Any suitable configuration may be employed.
Similarly, the configuration of the on-off valve 61 of the above-described embodiment is merely an example, and the check valve according to the present invention is configured to stop high-pressure compressed air sent from the outside. If so, an appropriate configuration may be adopted.
Further, the configuration of the operation unit 75 is not limited to the above-described embodiment, and an appropriate configuration may be adopted.

10 Screwing machine (pneumatic tool)
DESCRIPTION OF SYMBOLS 11 Drive mechanism part 12 Drive part 13 Driver part 14 Operation trigger mechanism 21 Nozzle part 22 Supply path 23 Launch port 25 Magazine 31 Handle part 32 Accumulation chamber 35 Connection port 37 Installation space 38 Duster installation space 40 Pressure regulation valve 41 Support base | substrate 42 Through-hole 43 External communication hole 44 Energizing space chamber 45 Outflow opening 47 First energizing spring 48 Second energizing spring 50 Valve body 51 Valve base 52 Cylindrical portion 53 Shaft portion 54 Communication hole 55 Valve body 56 Sealing Contact surface 57 Seat surface 59 Pressure regulating pressure chamber 60 Air duster 61 Open / close valve 62 Support base 63 Open inflow chamber 64 Seat surface 65 Outflow opening 67 Valve body 68 Pressing surface 71 Sealing ring 72 Damping ring 73 Air inflow port 74 Branch Inflow passage 75 Operation portion 80 Injection portion 81 Injection passage 82 Injection port (outlet)
90 protective ribs

Claims (2)

A driving mechanism that drives using compressed air as a driving source, a pressure accumulating chamber that stores compressed air serving as the driving source, and compressed air sent from the compressed air source when supplying compressed air from the compressed air source to the pressure accumulating chamber An air tool including a pressure regulating valve for reducing pressure,
An air tool, wherein an open / close valve for an air duster is provided upstream of the pressure regulating valve. The pneumatic tool according to claim 1,
The air mechanism according to claim 1, wherein the drive mechanism has a function of driving out a screw and a function of screwing the screw.

Images