Work machine

Abstract

To improve convenience.SOLUTION: In a driving machine 1, a driver blade 44 is inserted into an injection passage 24A, and an air introduction groove part 82 is provided in the driver blade 44. An airflow AR, which is flowed into the injection passage 24A when a striking part 40 moves downward, is guided by the air introduction groove part 82 so that the airflow is directed to a supply passage 72A of a magazine 70 and then is ejected to the supply passage 72A. Specifically, the airflow AR flowed into the injection passage 24A is blown from the air introduction groove part 82 to the supply passage 72A so that the airflow flows downward through the supply passage 72A with respect to the lower end part of the driver blade 44. This enables fractions 92A of connectors 92 for nails 90 to be blown off downward in the supply passage 72A of the magazine 70, so as to suppress the fractions 92A from intruding into a main body 10 of the driving machine. This can suppress the intrusion of the fractions 92A into the main body 10 of the driving machine from affecting the main body 10 of the driving machine, so that convenience of the driving machine 1 can be improved.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] In the driving machine (working machine) described in Patent Document 1 below, a magazine is attached to the driving machine body, and a plurality of nails are stored in the magazine in a state where they are connected by connectors. The nails in the magazine are supplied into the injection path of the driving machine body by a feeder of the magazine. A striking unit and a pinwheel (rotating unit) are provided in the driving machine body. As the pinwheel rotates, the striking unit moves from a standby position to a top dead center position, and at the top dead center position it reverses and descends, striking the nails in the injection path. At this time, the connector connecting the nails is broken by the striking unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 032331 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in the driving machine, pieces of the connector broken off when struck may enter the driving machine body. In this case, for example, if the pieces that entered the driving machine body adhere to the pinwheel, the grease applied to the pinwheel may be attracted to the pieces, causing the pinwheel to run out of grease. If the pinwheel runs out of grease, this may lead to an increase in the sliding resistance of the pinwheel and a decrease in its durability, which may reduce the convenience of the driving machine.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a work machine that can improve convenience. [Means for solving the problem]

[0006] One or more embodiments of the present invention are a working machine comprising: an injection section having an injection path extending in a first direction; an impact section having a portion inserted into the injection path and moving to one side in the first direction to impact a fastener supplied to the injection path; a biasing section that biases the impact section to one side in the first direction; a rotating section configured to be engageable with the impact section and rotating to move the engaged impact section to the other side in the first direction against the biasing force of the biasing section; a magazine having a supply path extending from the injection path to one side in a second direction intersecting the first direction and pushing the fastener contained in the supply path to the other side in the second direction to supply it to the injection path; and an air guidance section provided in the impact section or the injection section that directs air flow that flows into the injection path when the impact section moves to one side in the first direction to the supply path and exhausts it to the supply path.

[0007] One or more embodiments of the present invention are a work machine in which the rotating portion is located on the other side of the first direction from the stopper supplied to the injection path, and the air flow flowing into the injection path is exhausted from the air guidance portion to the supply path so that it flows to one side in the first direction on the supply path side relative to one side end of the impact portion in the first direction.

[0008] One or more embodiments of the present invention are a working machine in which the striking section includes a piston arranged on the other side of the first direction relative to the injection section, and a blade extending from the piston to one side of the first direction and movably inserted into the injection passage, the piston is slidably housed in a cylinder connected to the injection passage, and the air guide section is an air guide groove section provided in the blade, the air guide groove section being formed in a groove shape open to the supply passage side and extending in the first direction on the other side of the first direction relative to the tip of the blade.

[0009] One or more embodiments of the present invention are a work machine in which a guide surface is formed at one end of the air guide groove portion in the first direction, and the guide surface is inclined toward the supply passage as it approaches one side in the first direction.

[0010] One or more embodiments of the present invention are a working machine in which, when the impact unit is in a non-operating state, the impact unit is disposed in a standby position, and when the impact unit is operated, the rotating unit moves the impact unit from the standby position to the other side in the first direction, and after the movement, the impact unit moves to one side in the first direction by the biasing force of the biasing unit to strike the fastener, and in the standby position, one end of the air guide groove portion in the first direction is blocked by the tip of the blade and the injection path, and when the impact unit strikes the fastener, the one end of the air guide groove portion in the first direction is opened to the supply path side.

[0011] One or more embodiments of the present invention are a working machine in which the striking section includes a piston arranged on the other side of the first direction relative to the injection section, and a blade extending from the piston to one side of the first direction and movably inserted into the injection passage, the piston is slidably housed in a cylinder connected to the injection passage, the air guide section is an air guide groove section provided in the injection section, the air guide groove section is formed in a groove shape that is open to the injection passage side and extends along the first direction, and is arranged on the supply passage side of the injection passage and on the other side of the supply passage in the first direction, and the air flow is exhausted from one end of the air guide groove section in the first direction to one side in the first direction.

[0012] One or more embodiments of the present invention are a work machine in which an inlet section is provided at the other end side of the injection path in the first direction to guide the air flow to the air guidance section, and the cross-sectional area of ​​the inlet section as viewed from the first direction is set to increase toward the other side in the first direction.

[0013] One or more embodiments of the present invention are a work machine including an air flow suppression unit that suppresses the air flow from flowing to the rotating unit.

[0014] In one or more embodiments of the present invention, the rotating part is accommodated in a storage chamber connected to the injection path, and an opening is formed at the other end of the injection part in the first direction to open the injection path and the inlet part toward the storage chamber, and the air flow suppression part blocks a portion of the air flow flowing into the inlet part to suppress the flow of the air flow toward the opening.

[0015] One or more embodiments of the present invention are a work machine in which the opening is arranged on one side of the outlet path in a direction perpendicular to the second direction when viewed from the first direction, the air flow suppression section blocks the air flow flowing into the inlet section in an area on the other side of the blade in the second direction, and the air guidance section is located on one side of the second direction relative to the air flow suppression section.

[0016] In one or more embodiments of the present invention, the cylinder is provided with a communication passage on one side of the piston in the first direction that connects the inside and outside of the cylinder, and a regulating valve is provided in the communication passage, which regulates the flow of air flowing from the inside of the cylinder to the outside and allows the flow of air flowing from the outside of the cylinder to the inside of the cylinder. Effect of the Invention

[0017] One or more embodiments of the present invention can provide increased convenience. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a side view of the driving tool according to the present embodiment, as viewed from the left side. [Diagram 2] 2 is a cross-sectional view showing the inside of the front end portion of the driving tool shown in FIG. 1 as viewed from the right side. [Diagram 3]3 is a cross-sectional view showing the nose, the cylinder, and the inside of the pressure accumulator vessel of the driving machine shown in FIG. 2 as viewed from the left side. FIG. [Figure 4] 4 is a cross-sectional view showing a state in which the driver blade shown in FIG. 3 has moved to a top dead center position. [Diagram 5] 5 is a cross-sectional view showing a state in which the driver blade shown in FIG. 4 has descended and started to strike the nail. [Figure 6] 6 is a cross-sectional view showing a state in which the driver shown in FIG. 5 is further lowered and the nail connector is broken by the driver blade. FIG. [Figure 7] 7 is a cross-sectional view showing a state in which the driver blade shown in FIG. 6 is further lowered and pieces of the connector fall onto the workpiece. FIG. [Figure 8] 8 is a cross-sectional view showing a state in which the driver blade shown in FIG. 7 has descended to a bottom dead center position and has completed striking the nail. FIG. [Figure 9] 7 is a cross-sectional view (cross-sectional view taken along line 9-9 in FIG. 6) showing the inside of the ejection path of the driver blade shown in FIG. 6 as seen from the rear side. [Figure 10] 10 is a cross-sectional view (cross-sectional view taken along line 10-10 in FIG. 9) showing the injection hole of the nose and the injection path of the driver blade shown in FIG. 9 as seen from above. [Figure 11] 9A is a cross-sectional view from above showing the vertical middle portion of the injection path shown in FIG. 9 (cross-sectional view taken along line 11A-11A in FIG. 9), and FIG. 9B is a cross-sectional view from above showing the lower portion of the injection path shown in FIG. 9 (cross-sectional view taken along line 11B-11B in FIG. 9). [Figure 12] 7 is a cross-sectional view showing a modified example of the air guide groove portion shown in FIG. 6. [Figure 13] 4A and 4B are cross-sectional views showing an example in which a one-way valve is provided in the cylinder shown in FIG. 3, where (A) is a cross-sectional view showing a state in which the one-way valve restricts the flow of air from the inside to the outside of the cylinder, and (B) is a cross-sectional view showing a state in which the one-way valve allows the flow of air from the outside to the inside of the cylinder. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The following describes a driving machine 1 as a work machine according to this embodiment with reference to the drawings. Note that the arrows UP, FR, and LH shown in the drawings indicate the upper side, front side, and left side of the driving machine 1, respectively. In the following description, when the up-down, front-back, and left-right directions are used, they refer to the up-down, front-back, and left-right directions of the driving machine 1 unless otherwise specified. The up-down direction corresponds to the first direction of the present invention, and the front-back direction corresponds to the second direction of the present invention.

[0020] 1 and 2, the driving machine 1 has a driving machine body 10 (broadly speaking, an element that can be understood as a work machine body), and a magazine 70 is attached to the driving machine body 10. The magazine 70 is loaded (stored) with nails 90 (see Figs. 3 to 9) as fasteners, and the nails 90 are supplied to the driving machine body 10 by the magazine 70, and the nails 90 are driven into a workpiece W by striking the nails with a striking section 40 of the driving machine body 10.

[0021] 1 to 9, the driving machine body 10 includes a housing 12, a nose 20, a cylinder 26, a pressure accumulator vessel 30 as a biasing section, a striking section 40, and a drive mechanism 50. The driving machine body 10 also has an exhaust mechanism 80 that exhausts air flow AR (see Figs. 6 and 7) that is generated within the driving machine body 10 when striking a nail 90. Each component of the driving machine 1 will be described below.

[0022] (About Housing 12) 1, the housing 12 is formed in a hollow, generally inverted P-shape in a side view from the left side. Specifically, the housing 12 includes a main body housing portion 12A extending in the vertical direction, a handle portion 12B extending obliquely upward and rearward from a vertical middle portion of the main body housing portion 12A, and a motor housing portion 12C extending rearward from a lower end portion of the main body housing portion 12A. The rear end portion of the motor housing portion 12C is bent upward and connected to the rear end portion of the handle portion 12B.

[0023] A battery 14 is detachably attached to the rear end of the handle portion 12B. The battery 14 is electrically connected to a control unit (not shown) housed in the housing 12, and supplies power from the battery 14 to the control unit. A trigger 16 is provided in the front end of the handle portion 12B. The trigger 16 protrudes downward from the handle portion 12B and is configured to be operable by pulling upward. In addition, a trigger switch (not shown) is provided above the trigger 16 in the front end of the handle portion 12B. When the trigger 16 is operated, the trigger switch is actuated by the trigger 16, and a detection signal is output from the trigger switch to the control unit. The control unit detects the operation of the trigger 16 based on the detection signal from the trigger switch.

[0024] (About Nose 20) As shown in FIG. 2, the nose 20 is disposed within the lower end of the main body housing portion 12A. As also shown in FIGS. 3 to 10, the upper portion of the nose 20 is the upper nose portion 20A, which is formed in a bottomed cylindrical shape that is open to the top. An injection hole 20B is formed penetrating the center of the bottom wall of the upper nose portion 20A. The injection hole 20B is formed in a substantially D-shape when viewed from above (see FIG. 10). Specifically, the injection hole 20B has a first inner peripheral surface 20B1 formed in a straight line along the left-right direction when viewed from above, and a second inner peripheral surface 20B2 formed in an arc shape that convex toward the rear side. The first inner peripheral surface 20B1 is formed along a plane perpendicular to the front-rear direction, and the second inner peripheral surface 20B2 is inclined radially outward as it approaches the upper side. A portion of the bottom wall of the nose 20 adjacent to the front side of the injection hole 20B is made into a blocking portion 20F as an airflow suppressing portion. That is, the first inner circumferential surface 20B1 forms the rear surface of the blocking portion 20F.

[0025] A substantially cylindrical bumper 22 is housed within the upper nose portion 20A. When a striking portion 40, which will be described later, descends from a top dead center position to a bottom dead center position, the striking portion 40 collides with the bumper 22, and the kinetic energy of the striking portion 40 is absorbed by the bumper 22.

[0026] The lower part of the nose 20 is the lower nose part 20C, and the lower nose part 20C extends in the vertical direction. The lower nose part 20C is provided with a blade guide 24 as an injection part. The blade guide 24 is formed in a substantially rectangular tubular shape extending in the vertical direction. The inside of the blade guide 24 is formed as an injection path 24A, and the injection path 24A is located below the injection hole 20B. An injection opening 24B (in a broad sense, an element that can be understood as a connection part, see FIG. 11(B)) is formed in the rear wall of the lower part of the blade guide 24. The injection opening 24B penetrates in the front-rear direction and extends in the vertical direction, and the lower end of the injection opening 24B is opened to the lower side. That is, the lower part of the blade guide 24 is formed in a substantially U-shape that is opened to the rear side when viewed from above, and the lower part of the injection path 24A is opened to the rear side by the injection opening 24B. The blade guide 24 will be described in detail later.

[0027] 2 and 9, a storage cylinder portion 20D for storing a pinwheel 60 (described later) is provided at the upper end of the lower nose portion 20C, to the right of the blade guide 24. The storage cylinder portion 20D is formed in a substantially cylindrical shape with the axial direction extending in the front-rear direction, and the inside of the storage cylinder portion 20D is configured as a storage chamber 20E.

[0028] (Regarding cylinder 26) Cylinder 26 is formed in a generally cylindrical shape with its axial direction extending in the vertical direction, and is disposed within main body housing portion 12A above nose 20. A male thread is formed on the outer periphery of the lower end of cylinder 26, and this male thread is screwed into a female thread formed on the inner periphery of upper nose portion 20A, connecting cylinder 26 to nose 20.

[0029] (Regarding the pressure accumulator 30) The pressure accumulator 30 is generally formed in a cylindrical shape with a bottom that is open downward. The pressure accumulator 30 includes a container base 32 that constitutes the lower part of the pressure accumulator 30 and a container cover 34 that constitutes the upper part of the pressure accumulator 30. The container base 32 is generally formed in a cylindrical shape with the vertical direction as the axial direction. The container base 32 is disposed radially outside the upper end of the cylinder 26 and is fixed to the cylinder 26 by screw connection. The rear end of the container base 32 protrudes rearward and downward. A valve (not shown) is provided at the rear end of the container base 32, and the pressure accumulator 30 is configured to be filled with gas by an operator using the valve. The gas filled in the pressure accumulator 30 is air, an inert gas, or the like, and in this embodiment, air is filled in the pressure accumulator 30. The air pressure in the pressure accumulator 30 urges a striking section 40, which will be described later, downward.

[0030] The container cover 34 is formed in a concave shape that is open downward. The upper end of the container base 32 is fitted into the lower end of the container cover 34, and the container cover 34 is fixed to the container base 32. As a result, the upper end of the cylinder 26 is covered by the pressure accumulator container 30.

[0031] (Regarding the striking part 40) The striking section 40 is formed in an elongated shape extending in the vertical direction, and is housed in the cylinder 26 so as to be movable in the vertical direction. Specifically, the striking section 40 is configured to be movable between a top dead center position (position shown in FIG. 4) and a bottom dead center position (position shown in FIG. 8) which is moved downward from the top dead center position. When the driving machine 1 is in an inoperative state, the striking section 40 is disposed in a standby position (position shown in FIG. 3) between the top dead center position and the bottom dead center position. The striking section 40 includes a piston 42 which constitutes the upper end of the striking section 40, and a driver blade 44 which serves as a blade extending downward from the piston 42.

[0032] The piston 42 is formed in a generally cylindrical shape with a bottom that is open upward. The outer diameter of the piston 42 is set slightly smaller than the inner diameter of the cylinder 26, and the piston 42 is slidably housed within the cylinder 26. A blade attachment portion 42A for attaching a driver blade 44 (described later) is formed in the center of the piston 42. The blade attachment portion 42A is formed in a generally cylindrical shape with the axial direction being the up-down direction, and extends downward from the piston 42.

[0033] The driver blade 44 is formed in a substantially rectangular column shape extending in the vertical direction. The upper end of the driver blade 44 is fitted into the blade attachment portion 42A and fixed to the piston 42, and the driver blade 44 extends downward from the piston 42. The tip portion (lower end portion) of the driver blade 44 is inserted into the injection passage 24A of the nose 20 so as to be movable in the vertical direction. As a result, the striking portion 40 moves from the top dead center position to the bottom dead center position, so that the nail 90 in the injection passage 24A is struck from above by the driver blade 44. In addition, when the driver blade 44 descends from the top dead center position, the air in the cylinder 26 is compressed by the piston 42, and an air flow AR toward the downward side is generated in the cylinder 26, and this air flow AR is made to flow into the injection passage 24A through the injection hole 20B. The driver blade 44 is provided with a plurality of rack portions 44A. The rack portion 44A protrudes to the right from the driver blade 44 and is disposed at a predetermined interval in the vertical direction.

[0034] (Regarding the driving mechanism 50) As shown in FIG. 2, the drive mechanism 50 includes a motor 52, a reduction mechanism 54, and a converter 58. The motor 52 is configured as a brushless motor, is housed in the rear end side of the motor housing 12C, and is electrically connected to the controller. The motor 52 has a drive shaft 52A whose axial direction is the front-rear direction, and a front end of the drive shaft 52A is connected to a reduction mechanism 54 disposed in front of the motor 52. The reduction mechanism 54 is connected to a rotation shaft 56 provided in the housing chamber 20E of the nose 20, and the rotation force of the motor 52 is transmitted to the rotation shaft 56 via the reduction mechanism 54.

[0035] As also shown in Fig. 9, the conversion unit 58 is disposed in the accommodation chamber 20E. The conversion unit 58 is configured as a mechanism that transmits the rotational force of the rotating shaft 56 to the driver blade 44 to move the driver blade 44 upward. The conversion unit 58 is configured to include a pinwheel 60 as a rotating part fixed to the rotating shaft 56, a plurality of pinion pins 62 provided on the pinwheel 60, and the rack portion 44A of the driver blade 44 described above. The pinion pins 62 are disposed at predetermined intervals in the circumferential direction of the rotating shaft 56, and the rack portion 44A is disposed at predetermined intervals in the vertical direction.

[0036] The pinion pin 62 is configured to be able to engage and disengage with the rack portion 44A. When the pinwheel 60 rotates and the pinion pin 62 engages with the rack portion 44A, the driver blade 44 moves upward. On the other hand, when the engagement between the pinion pin 62 and the rack portion 44A is released, the impact portion 40 is lowered by the pressure in the pressure accumulator vessel 30.

[0037] (About Magazine 70) As shown in Figs. 1 to 8, the magazine 70 includes a magazine case 72 and a feeder 74 provided in the magazine case 72. The magazine case 72 is formed in a generally long and flat shape with a thickness in the left-right direction. The magazine case 72 is disposed adjacent to the left side of the motor housing portion 12C, is attached to the driving tool body 10, and extends rearward from the blade guide 24. Specifically, the front end of the magazine case 72 is connected to the ejection opening 24B of the blade guide 24 (see Fig. 11(B)), and the magazine case 72 is inclined upward toward the rear as viewed from the left side. The inside of the magazine case 72 is configured as a supply passage 72A that accommodates a plurality of nails 90, and the supply passage 72A communicates with the ejection passage 24A of the blade guide 24. The plurality of nails 90 are disposed in the supply passage 72A with the axial direction being the up-down direction, and are disposed at a predetermined interval along the longitudinal direction of the magazine case 72. The nails 90 are connected to one another at their longitudinal intermediate portions by connectors 92. A discharge portion 72B is formed at the lower end of the front end portion of the magazine case 72, and the discharge portion 72B penetrates in the up-down direction.

[0038] The feeder 74 is attached to the magazine case 72 so as to be movable in the longitudinal direction of the magazine case 72. The feeder 74 is configured to be able to engage with the nails 90 inside the magazine case 72, and is biased toward the front end side of the magazine case 72 by a biasing spring (not shown). This allows the nails 90 to be supplied into the ejection path 24A by the feeder 74.

[0039] (About Blade Guide 24) 3 to 11, as described above, the blade guide 24 is formed in a generally rectangular tubular shape with the vertical axis as the axial direction, and the driver blade 44 of the striking portion 40 is inserted into the ejection path 24A of the blade guide 24. The shape of the ejection path 24A as viewed from above is set to be slightly larger than the outer shape of the driver blade 44 (see FIG. 11(B)), and the ejection hole 20B guides the movement of the driver blade 44 in the vertical direction.

[0040] An expanded diameter portion 24C is formed at the upper end of the blade guide 24. The expanded diameter portion 24C is formed in a substantially semi-conical cylindrical shape that expands in diameter toward the upper side, and protrudes toward the rear side of the blade guide 24. The inside of the expanded diameter portion 24C is an inlet portion 24D, and the inlet portion 24D constitutes the upper end of the injection path 24A. The cross-sectional area of ​​the inlet portion 24D as viewed from above is set to increase toward the upper side. The inlet portion 24D is formed in a substantially D-shape as viewed from above, corresponding to the shape of the injection hole 20B of the nose 20. That is, at the upper end of the blade guide 24, a blocking portion 24E as an airflow suppressing portion is adjacent to the front side of the inlet portion 24D, and the rear surface of the blocking portion 24E constitutes the front surface of the injection path 24A. As a result, airflow AR flowing through the front region of driver blade 44 is blocked at the positions of injection hole 20B and inlet portion 24D by blocking portion 20F of nose 20 and blocking portion 24E of blade guide 24. The shape of the upper end of inlet portion 24D as viewed from above is set to be the same as the shape of the lower end of injection hole 20B.

[0041] As shown in FIG. 9, the housing chamber 20E of the nose 20 is located on the right side of the upper end of the blade guide 24. An opening 24F is formed at the upper end of the blade guide 24, penetrating in the left-right direction. The opening 24F is formed in a groove shape extending in the up-down direction, and the lower end of the opening 24F protrudes downward from the enlarged diameter portion 24C (inlet portion 24D). As a result, the opening 24F opens the ejection path 24A and the inlet portion 24D to the housing chamber 20E side of the nose 20, and the rack portion 44A of the driver blade 44 is exposed to the pinwheel 60 side from the opening 24F, so that the rack portion 44A and the pinion pin 62 of the pinwheel 60 can be engaged with each other.

[0042] The dimensions of the ejection path 24A and the opening 24F in the front-rear direction are the same, and both front-rear side surfaces of the ejection path 24A and both front-rear side surfaces of the opening 24F are disposed flush with each other. As will be described in detail later, the blocking portion 20F of the nose 20 and the blocking portion 24E of the blade guide 24 prevent the airflow AR flowing through the front region of the driver blade 44 from flowing out from the opening 24F to the accommodation chamber 20E side.

[0043] (Regarding the exhaust mechanism 80) The exhaust mechanism 80 includes the blocking portion 20F formed in the nose 20, the inlet portion 24D and the blocking portion 24E formed in the blade guide 24, an airflow guide groove portion 82 as an airflow guide portion, and an exhaust hole 84 as a pair of communication passages. The airflow guide groove portion 82 is formed in a groove shape extending in the vertical direction and opening to the rear side at the left-right center of the rear surface of the driver blade 44. That is, the airflow guide groove portion 82 is located behind the blocking portion 20F of the nose 20 and the blocking portion 24E of the blade guide 24, sandwiching the driver blade 44. The airflow guide groove portion 82 is formed over substantially the entire longitudinal direction of the driver blade 44, except for the lower end and the upper end of the driver blade 44. The airflow AR passing through the injection hole 20B of the nose 20 is narrowed by the inlet portion 24D of the injection passage 24A and flows into the airflow guide groove portion 82, and flows downward inside the airflow guide groove portion 82. A guide surface 82A (broadly speaking, this is an element that can be understood as an exhaust section) is formed at the lower end of the airflow groove section 82. When viewed from the left-right direction, the guide surface 82A is inclined toward the rear as it extends downward. The upper end of the guide surface 82A is connected to the bottom surface of the airflow groove section 82, and the lower end of the guide surface 82A is connected to the rear surface of the driver blade 44.

[0044] At the standby position of the striking section 40, the lower end of the driver blade 44 contacts the front end of the magazine case 72, and the lower end of the airflow guide groove section 82 (the portion where the guide surface 82A is formed) is blocked by the lower end of the driver blade 44 and the ejection path 24A (see FIG. 3). Furthermore, although details will be described later, when the driver blade 44 descends from the top dead center position to strike the nail 90, the airflow AR is ejected (exhausted) from the lower end of the airflow guide groove section 82 toward the supply path 72A of the magazine 70. Specifically, the inclination angle of the guide surface 82A of the airflow guide groove section 82 and the like are set so that the airflow AR ejected from the guide surface 82A of the airflow guide groove section 82 toward the supply path 72A flows downward (diagonally backward) behind the lower end of the driver blade 44. That is, the guide surface 82A has a function of changing the direction of the air flow AR flowing downward toward the supply path 72A side (diagonally downward and rearward), and also has a function of discharging the air flow AR toward the supply path 72A side.

[0045] A pair of exhaust holes 84 are provided at the lower end of the cylinder 26 and are located above the nose 20. Specifically, the exhaust holes 84 are formed at the front end and the rear end, respectively, of the lower end of the cylinder 26. When the striking part 40 descends from the top dead center position, a part of the airflow AR is exhausted from the exhaust holes 84 to the outside of the cylinder 26.

[0046] (Action and effect) Next, the operation of the nail driver 1 will be described, and the effects and advantages of this embodiment will be described. When the nail driver 1 is in a non-operating state, the motor 52 is stopped, and the impact unit 40 is placed in a standby position (see FIG. 3). In this state, the pinion pin 62 of the pinwheel 60 and the rack unit 44A of the driver blade 44 are engaged. Also, the lower end of the driver blade 44 contacts the front end of the magazine case 72, and the lower end of the air guide groove unit 82 is blocked by the lower end of the driver blade 44 and the ejection path 24A. Furthermore, the head of the nail 90 contacts the lower end of the driver blade 44 from the rear side, and the nail 90 is not supplied to the ejection path 24A, but is placed in the supply path 72A of the magazine 70.

[0047] When the operator operates the trigger 16 and the control unit detects the operation of the trigger 16, the control unit drives the motor 52. When the motor 52 is driven, the driving force of the motor 52 rotates the pinwheel 60, and the striking unit 40 moves upward from the standby position to the top dead center position (see FIG. 4). As a result, the lower end of the driver blade 44 moves above the nail 90, and the abutment state between the driver blade 44 and the nail 90 is released. Thus, the nail 90 is supplied into the ejection path 24A. At the top dead center position of the striking unit 40, the engagement state between the pinion pin 62 and the rack unit 44A is released.

[0048] As shown in FIG. 5, when the pinion pin 62 and the rack portion 44A are disengaged, the pressure in the pressure accumulator container 30 causes the striking portion 40 to descend and strike the nail 90 downward. As shown in FIG. 6, when the striking portion 40 descends from the top dead center position, a downward airflow AR is generated in the space below the piston 42 in the cylinder 26. A part of the airflow AR is exhausted to the outside of the cylinder 26 from the exhaust hole 84 of the cylinder 26. The other airflow AR passes through the injection hole 20B of the nose 20 and flows into the inflow portion 24D of the injection passage 24A in the blade guide 24. The airflow AR that flows into the inflow portion 24D is throttled by the inflow portion 24D and flows into the air guide groove portion 82 of the driver blade 44, and flows downward inside the air guide groove portion 82. Furthermore, when the striking portion 40 strikes the nail 90, the closed state of the lower end of the air guide groove portion 82 is released, and the lower end of the air guide groove portion 82 is opened to the supply passage 72A side.

[0049] Here, when the driver blade 44 strikes, the connector 92 connecting the nail 90 in the ejection path 24A and the nail 90 in the supply path 72A is broken by the driver blade 44. Also, the direction of the airflow AR flowing downward in the air guide groove portion 82 is changed by the guide surface 82A, and the airflow AR is ejected (exhausted) from the guide surface 82A toward the supply path 72A side. Specifically, the airflow AR is ejected downward and rearward from the guide surface 82A, and flows downward and rearward on the rear side (the supply path 72A side) of the lower end portion of the driver blade 44. Therefore, when the connector 92 is broken by the driver blade 44, the broken pieces 92A of the connector 92 are blown downward by the airflow AR ejected from the guide surface 82A of the air guide groove portion 82.

[0050] As shown in Fig. 7, when the driver blade 44 further descends, fragments 92A of the connector 92 are blown away by the airflow AR ejected from the air guide groove portion 82 and fall from the discharge portion 72B of the magazine case 72 onto the workpiece W. As shown in Fig. 8, the driver blade 44 descends to the bottom dead center position, completing the driving of the nail 90 by the driver blade 44.

[0051] The control unit continues to drive the motor 52 even after the nail 90 is driven into the workpiece W. As a result, the pinion pin 62 re-engages with the rack portion 44A, and the striking unit 40 moves upward from the bottom dead center position and is positioned at the standby position. A position sensor (not shown) that detects the up-down position of the striking unit 40 is also connected to the control unit, and the control unit detects the standby position of the striking unit 40 based on the output signal from the position sensor. As a result, the control unit stops the motor 52, and the nail driver 1 becomes inoperative.

[0052] As described above, in the nail driving machine 1, the driver blade 44 is inserted into the ejection path 24A, and the air guide groove portion 82 is provided on the driver blade 44. When the impact portion 40 moves downward, the air flow AR in the cylinder 26 flows into the ejection path 24A, and the air flow AR that flows into the ejection path 24A is directed by the air guide groove portion 82 to the supply path 72A of the magazine 70 and is exhausted to the supply path 72A. Specifically, the air flow AR that flows into the ejection path 24A is ejected from the air guide groove portion 82 to the supply path 72A so as to flow downward on the supply path 72A side with respect to the lower end portion of the driver blade 44. As a result, as described above, the fragments 92A of the connector 92 of the nail 90 broken by the driver blade 44 are blown downward in the supply path 72A of the magazine 70, and the intrusion of the fragments 92A into the nail driving machine body 10 can be suppressed. As a result, it is possible to suppress the influence on the driving machine body 10 caused by the fragments 92A entering the driving machine body 10. Therefore, the convenience of the driving machine 1 can be improved.

[0053] Furthermore, by providing the air guide groove portion 82 in the driver blade 44, when the connector 92 is broken, the airflow AR ejected from the driver blade 44 can hit the connector 92 near the connector 92. This makes it possible to efficiently blow away the broken pieces 92A of the connector 92 downward.

[0054] Also, a guide surface 82A is formed at the lower end of the airflow groove 82, and the guide surface 82A is inclined rearward as it goes downward when viewed from the left-right direction. This allows the airflow AR flowing downward along the airflow groove 82 to be redirected diagonally downward and rearward by the guide surface 82A, and to be ejected from the lower end of the airflow groove 82 toward the supply path 72A. As a result, the airflow AR is caused to flow downward behind the lower end of the driver blade 44, and the pieces 92A of the connector 92 can be blown downward.

[0055] Furthermore, when the striking unit 40 is in the standby position, the lower end of the driver blade 44 abuts against the front end of the magazine case 72, and the lower end of the air guide groove 82 is blocked by the lower end of the driver blade 44 and the air guide groove 82. This makes it possible to prevent dust and the like from entering the driver body 10 through the air guide groove 82 when the driver blade 44 is in a non-operating state. Therefore, even if the driver blade 44 is configured to have the air guide groove 82 that exhausts the air flow AR, the dustproofness of the driver 1 can be ensured.

[0056] Further, at the upper end of the emission path 24A, an inlet section 24D is provided for guiding the airflow AR to the airflow guide groove section 82, and the cross-sectional area of ​​the inlet section 24D as viewed from the top-bottom direction is set to increase toward the upper side. This allows the airflow AR flowing into the inlet section 24D to be narrowed by the inlet section 24D, and to flow efficiently into the airflow guide groove section 82 of the driver blade 44.

[0057] Further, the nose 20 is provided with a blocking portion 20F at the position of the ejection hole 20B, and the blade guide 24 is provided with a blocking portion 24E at the position of the inlet 24D, so that the blocking portion 20F and the blocking portion 24E prevent the airflow AR from flowing out from the opening 24F of the blade guide 24 to the accommodation chamber 20E of the nose 20. Specifically, the blocking portion 20F is disposed adjacent to the front side of the driver blade 44 at the position of the ejection hole 20B, and the blocking portion 24E is disposed adjacent to the front side of the driver blade 44 at the position of the inlet 24D, so that the airflow AR flowing in front of the driver blade 44 is blocked by the blocking portion 20F and the blocking portion 24E at the positions of the ejection hole 20B and the inlet 24D. This makes it possible to prevent the airflow AR flowing in front of the driver blade 44 from flowing out from the front end of the opening 24F to the accommodation chamber 20E.

[0058] That is, if the injection hole 20B of the nose 20 is formed in a circular shape and the blocking portion 20F is omitted from the nose 20, and the enlarged diameter portion 24C of the blade guide 24 is formed in a conical cylindrical shape and the blocking portion 24E is omitted from the blade guide 24, a gap is formed over the entire circumference in the circumferential direction between the injection hole 20B and the inlet portion 24D and the driver blade 44. In this configuration, when the air flow AR flows from the front end portion of the injection hole 20B into the front end portion of the inlet portion 24D, the air flow AR flows downward along the inclined surface of the inlet portion 24D and hits the front surface of the driver blade 44. At this time, since the air guide groove portion 82 is not formed on the front surface of the driver blade 44, the air flow AR that hits the front surface of the driver blade 44 flows outward in the left-right direction along the front surface of the driver blade 44. For this reason, there is a possibility that the air flow AR flowing to the right along the front surface of the driver blade 44 may flow out from the front end of the opening 24F to the accommodation chamber 20E side. In this case, fragments 92A of the connector 92 may scatter into the ejection path 24A of the blade guide 24, and then flow into the accommodation chamber 20E by the air flow AR and adhere to the pinwheel 60. As a result, the pinwheel 60 and the lubricant applied to the pinwheel 60 may be adsorbed by the fragments 92A, increasing the sliding resistance between the pinwheel 60 and the rack portion 44A of the driver blade 44, possibly causing wear.

[0059] In contrast, in this embodiment, the blocking portion 20F of the nose 20 is disposed adjacent to the front side of the driver blade 44 at the position of the injection hole 20B, and the blocking portion 24E of the blade guide 24 is disposed adjacent to the front side of the driver blade 44 at the position of the inlet portion 24D. As a result, the air flow AR flowing in the front region of the driver blade 44 is blocked by the blocking portion 20F and the blocking portion 24E at the positions of the injection hole 20B and the inlet portion 24D. Specifically, the air flow AR hits the upper surface of the blocking portion 20F, flows along the upper surface of the blocking portion 20F, and flows into the inlet portion 24D so as to go around the outside in the left and right direction of the driver blade 44 (see Figs. 6 and 10). There is a slight gap between the inlet portion 24D and the outer peripheral surface of the driver blade 44, particularly around the periphery of the rack portion 44A, when viewed in the up-down direction, but the cross-sectional area of ​​the gap is smaller than the cross-sectional area of ​​the space formed by the air guide groove portion 82, and the flow path resistance is also large, so most of the air flow AR is concentrated in the air guide groove portion 82. As a result, the airflow AR that hits the blocking portion 20F flows out from the front end of the opening 24F toward the accommodation chamber 20E, and the fragments 92A are prevented from entering the accommodation chamber 20E. This makes it possible to prevent wear on the pinwheel 60 and the rack portion 44A of the driver blade 44 caused by the lubricant applied to the pinwheel 60 being adsorbed by the fragments 92A. This contributes to improving the durability of the driving tool 1.

[0060] (Modification of the air guide groove portion 82) Next, a modified example of the airflow guide groove portion 82 will be described with reference to FIG. 12. In this modified example, the airflow guide groove portion 82 is provided at the rear of the blade guide 24, and the rear surface of the driver blade 44 is formed in a flat shape. The airflow guide groove portion 82 is formed in a groove shape extending in the vertical direction and opening to the front side above the emission opening 24B of the blade guide 24, and penetrates in the vertical direction. That is, the airflow guide groove portion 82 is disposed adjacent to the rear side of the blade guide 24, and the upper end portion of the airflow guide groove portion 82 communicates with the inlet portion 24D. The width dimension (horizontal dimension) of the airflow guide portion 82 is set smaller than the width dimension of the driver blade 44. That is, although not shown, the cross section of the upper portion of the blade guide 24 viewed from the top is formed in an approximately T-shape that protrudes to the rear side.

[0061] In addition, the upper end at the front end of the magazine case 72 is positioned at a position lower and rearward than in this embodiment in correspondence with the air guide groove portion 82, and the lower end of the air guide groove portion 82 is open downward, connecting the inside of the air guide groove portion 82 to the supply path 72A of the magazine 70.

[0062] Also in this modification, when the impact part 40 descends from the top dead center position, the air flow AR passes through the injection hole 20B and flows into the inlet part 24D of the injection path 24A in the blade guide 24. The air flow AR that flows into the inlet part 24D is narrowed by the inlet part 24D and flows into the air guide groove part 82 of the blade guide 24, and flows downward inside the air guide groove part 82. Then, the air flow AR is ejected downward from the lower end part of the air guide groove part 82, and flows downward behind the lower end part of the driver blade 44. Therefore, in this modification, as in the present embodiment, when the connector 92 is broken by the driver blade 44, the fragments 92A of the connector 92 are blown downward by the air flow AR ejected from the air guide groove part 82. Therefore, the fragments 92A of the connector 92 can be prevented from entering the driver body 10. As a result, it is possible to suppress the influence on the driving machine body 10 caused by the fragments 92A entering the driving machine body 10. Therefore, the convenience of the driving machine 1 can be improved.

[0063] In this embodiment (including the above-mentioned modified examples), the exhaust hole 84 is provided at the lower end of the cylinder 26, and when the striking part 40 descends from the top dead center position, part of the airflow AR flows out of the cylinder 26 from the exhaust hole 84, but the method of exhausting the airflow AR from the cylinder 26 is not limited to this. For example, as shown in Fig. 13, a one-way valve 100 may be provided at the exhaust hole 84 of the cylinder 26, and the one-way valve 100 may restrict the flow of air from the outside to the inside of the cylinder 26 while allowing the flow of air from the inside to the outside of the cylinder 26.

[0064] Specifically, the exhaust hole 84 has a first exhaust portion 84A constituting an upper portion of the exhaust hole 84 and a second exhaust portion 84B constituting a lower portion of the exhaust hole 84. The one-way valve 100 has a ring-shaped main body portion 102 and an O-ring 104 as a regulating valve. The main body portion 102 is fitted onto the cylinder 26 and disposed radially outside the exhaust hole 84. The main body portion 102 is formed with a valve path 102A as a communication path communicating with the exhaust hole 84, and the valve path 102A penetrates the cylinder 26 in the radial direction. The valve path 102A has an outer valve path 102A1 constituting an outer portion of the valve path 102A and an inner valve path 102A2 constituting an inner portion of the valve path 102A, and the cross-sectional area of ​​the outer valve path 102A1 is set smaller than the cross-sectional area of ​​the inner valve path 102A2.

[0065] The O-ring 104 is attached inside the inner valve passage 102A2 and closes the outer valve passage 102A1 from the radially inner side. When the O-ring 104 is attached to the inner valve passage 102A2, the exhaust hole 84 and the inner valve passage 102A2 communicate with each other. As a result, when an air flow AR toward the lower side occurs in the cylinder 26, the air flow AR flows from the first exhaust portion 84A through the inner valve passage 102A2 to the second exhaust portion 84B, and the blocking state of the outer valve passage 102A1 by the O-ring 104 is maintained. Therefore, the air flow AR is prevented from being exhausted from the exhaust hole 84 to the outside of the cylinder 26, and the air flow AR is exhausted from the air guide groove portion 82 into the supply passage 72A of the magazine 70.

[0066] On the other hand, when the striking part 40 rises from the bottom dead center position, the cylinder 26 becomes negative pressure, and the O-ring 104 elastically deforms radially inward due to this negative pressure, blocking the second exhaust part 84B of the exhaust hole 84. At this time, the valve path 102A and the first exhaust part 84A of the exhaust hole 84 communicate with each other, and an air flow AR2 is generated that is drawn into the cylinder 26 from the valve path 102A through the first exhaust part 84A. This allows air to flow into the cylinder 26 after striking by the striking part 40. In addition, since the one-way valve 100 and the exhaust hole 84 are located above the drive mechanism 50, it is possible to effectively prevent dust and the like from flowing into the drive mechanism 50 when air is drawn into the cylinder 26 by the one-way valve 100.

[0067] In the one-way valve 100, the O-ring 104 is used as the valve body, but a spherical ball may be used as the valve body instead of the O-ring 104. In this case, the ball may be biased radially outwardly of the one-way valve 100 by a biasing member such as a spring, so that the outer valve path 102A1 is closed by the ball.

[0068] In the present embodiment (including the above-described modified example), the blocking portion 20F is provided on the nose 20, and the blocking portion 24E is provided on the blade guide 24, but one of the blocking portion 20F and the blocking portion 24E may be omitted. [Explanation of symbols]

[0069] 1. Hammering machine (working machine) 20F Blocking section (air flow suppression section) 24 Blade guide (ejection part) 24A injection path 24D Inlet 24E Blocking section (air flow suppression section) 26 cylinders 30 Accumulator vessel (biasing part) 40 Striking section 42 Piston 44 Driver Blade (Blade) 60 Pinwheel (rotating part) 70 Magazine 72A Supply line 82 Airflow groove section (airflow section) 82A Guide surface 84 Exhaust hole (connection passage) 102A Valve passage (connection passage) 104 O-ring (regulating valve)

Claims

1. an emission section having an emission path extending in a first direction; a striking portion having a portion inserted into the injection passage and moving toward one side in the first direction to strike the fastener supplied to the injection passage; a biasing portion that biases the striking portion toward one side in the first direction; a rotating portion configured to be engageable with the impact portion and rotating to move the impact portion in an engaged state to the other side in the first direction against the biasing force of the biasing portion; a magazine having a supply passage extending from the injection passage toward one side of a second direction intersecting the first direction, and extruding the fastener housed in the supply passage toward the other side of the second direction to supply the fastener to the injection passage; an air guide section that is provided in the striking section or the ejection section and that directs the air flow that flows into the ejection passage when the striking section moves to one side in the first direction toward the supply passage and exhausts the air to the supply passage; A work machine equipped with the above.

2. the rotating portion is located on the other side in the first direction of the stopper supplied to the injection path, A work machine as described in claim 1, wherein the air flow flowing into the injection passage is exhausted from the air guidance section to the supply passage so as to flow toward one side in the first direction on the supply passage side relative to one end of the impact section in the first direction.

3. The striking part is a piston disposed on the other side of the injection portion in the first direction; a blade extending from the piston toward one side in the first direction and movably inserted into the injection path; The present invention relates to a method for manufacturing a computer-implemented ... The piston is slidably accommodated in a cylinder that is in communication with the injection passage, The airflow guide portion is an airflow guide groove portion provided in the blade, The work machine according to claim 1 , wherein the air guide groove portion is formed in a groove shape that is open to the supply passage side and extends in the first direction on the other side of the first direction relative to the tip of the blade.

4. The work machine according to claim 3, wherein a guide surface is formed at one end of the air guide groove portion in the first direction, and the guide surface is inclined toward the supply passage as it approaches the one side in the first direction.

5. When the striking unit is in a non-operating state, the striking unit is disposed at a standby position, When the striking portion is actuated, the striking portion is moved from the standby position to the other side in the first direction by the rotating portion, and the striking portion after the movement is moved to one side in the first direction by the biasing force of the biasing portion to strike the stopper, At the standby position, one end of the air guide groove portion in the first direction is blocked by the tip of the blade and the injection path, 5. The work machine according to claim 3, wherein one end of the air guide groove portion in the first direction is opened to the supply passage when the striking portion strikes the fastener.

6. The striking part is a piston disposed on the other side of the injection portion in the first direction; a blade extending from the piston toward one side in the first direction and movably inserted into the injection path; The present invention relates to a method for manufacturing a computer-implemented ... The piston is slidably accommodated in a cylinder that is in communication with the injection passage, The airflow guide portion is an airflow guide groove portion provided in the ejection portion, the air guide groove portion is formed in a groove shape that is open to the ejection path side and extends along the first direction, and is disposed on the supply path side of the ejection path and on the other side of the supply path in the first direction, 2. The work machine according to claim 1, wherein the air flow is exhausted from one end of the air guide groove portion in the first direction to one side in the first direction.

7. an inlet portion that guides the air flow to the air guidance portion is provided at the other end side of the injection path in the first direction, 7. The work machine according to claim 3 or claim 6, wherein a cross-sectional area of ​​the inlet portion as viewed from the first direction is set to increase toward the other side in the first direction.

8. The work machine according to claim 7 , further comprising an airflow suppressing portion that suppresses the airflow from flowing toward the rotating portion.

9. The rotating portion is accommodated in a housing chamber that is in communication with the injection path, an opening portion is formed at the other end portion in the first direction of the injection portion, the opening portion opening the injection path and the inlet portion toward the accommodation chamber; The work machine according to claim 8 , wherein the airflow suppressing portion blocks a portion of the airflow flowing into the inlet portion to suppress the airflow from flowing into the opening portion.

10. the opening is disposed on one side of the emission path in a direction perpendicular to the second direction as viewed from the first direction, the airflow suppression portion blocks the airflow flowing into the inlet portion in a region on the other side of the blade in the second direction, The work machine according to claim 9 , wherein the air guidance section is located on one side in the second direction relative to the airflow suppression section.

11. The cylinder is provided with a communication passage that communicates between the inside and the outside of the cylinder on one side of the piston in the first direction, 7. The work machine according to claim 3 or claim 6, wherein a regulating valve is provided in the communication passage, and the regulating valve regulates the flow of air flowing from the inside of the cylinder to the outside of the cylinder and allows the flow of air flowing from the outside of the cylinder to the inside of the cylinder.

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