Work machine

Abstract

Provided is a work machine with improved convenience. The work machine comprises an injection part 13, a striking part, a biasing part, a motor, a rotation part, and a push lever 42 that can move relative to the injection part 13 in a first direction AR1 by abutting on a counterpart member. The injection part 13 has, in a second blade guide 131, a feed port 133 which has a cylindrical shape extending in the first direction AR1 and to which a stopper is supplied from the outside. The push lever 42 has an arm part 422 which is disposed in the injection part 13. In a state in which the push lever 42 is positioned on the other side in the first direction AR1, an upper end part 42A of the arm part 422 on said other side in the first direction AR1 is positioned on said other side of an upper end part 133A of the feed port 133 in the first direction.

Description

Work equipment

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

[0002] Conventionally, a driving machine has been known as a work machine that moves a piston and a driver blade to strike a fastener with the driver blade. The driving machine is provided with a push lever, and the fastener is driven into the driving machine by pressing the push lever against the workpiece and operating a trigger. Patent Document 1 discloses a driving machine having a cylindrical push lever that can guide the movement of the fastener being driven in.

[0003] JP 2018-43293 A

[0004] When the push lever is extended, there is a risk that the stopper may get caught in the gap that occurs between the push lever and the blade guide in the axial direction of the driver blade, causing problems such as the stopper breaking, which could impair workability.

[0005] According to one embodiment, the work machine includes an ejector supporting a fastener, an impactor configured to impact the fastener supported by the ejector toward one side in a first direction, a biasing portion configured to bias the impactor toward one side in the first direction, a motor, a rotating portion configured to rotate by receiving driving force from the motor, and a contact portion configured to move relative to the ejector in the first direction by contacting a mating member. The impactor has a shaft extending in the first direction and a protruding portion protruding from the shaft in a second direction intersecting the first direction and engageable with the rotating portion. The rotating portion rotates while engaged with the protruding portion, thereby moving the impactor toward the other side in the first direction against the biasing force of the biasing portion, and when disengaged from the protruding portion, allows the impactor to move toward one side in the first direction due to the biasing force of the biasing portion. The ejector is cylindrical and extends in the first direction, and has a supply port on its side through which the fastener is supplied from outside. The contact portion has an arm portion disposed within the injection portion, and when the contact portion is positioned on the other side in the first direction, an end portion of the arm portion on the other side in the first direction is positioned on the other side in the first direction of an end portion of the supply port on the other side in the first direction.

[0006] According to one embodiment, the work machine includes an ejection unit that supports a fastener, an impact unit that impacts the fastener supported by the ejection unit in one direction in a first direction, a biasing unit that biases the impact unit in one direction in the first direction, a motor, a rotating unit that rotates by receiving driving force from the motor, and a contact unit that is movable relative to the ejection unit in the first direction by contacting an opposing material. The impact unit has a shaft that extends in the first direction, a protruding portion that protrudes from the shaft in a second direction intersecting the first direction and is engageable with the rotating unit, and a groove that is formed in the protruding portion and is recessed in a third direction intersecting the first direction and the second direction. The abutment portion has a rib that fits into the groove.

[0007] According to the present invention, it is possible to provide a work machine with improved convenience.

[0008] 16 is a side view of the exterior of a working machine according to a first embodiment. A cross-sectional view of the working machine. A perspective view showing a cross-section of a portion of the working machine. A partial cross-sectional view showing an enlarged view of a portion shown in FIG. 2. A cross-sectional view taken along line B-B in FIG. 4. A cross-sectional view taken along line CC in FIG. 4. An exterior plan view of the push lever and ejection unit of a second embodiment. A cross-sectional view taken along line D-D in FIG. 7. A cross-sectional view taken along line E-E in FIG. 8. A cross-sectional view taken along line F-F in FIG. 8. A cross-sectional view of the push lever and ejection unit of a third embodiment. A cross-sectional view of the push lever and ejection unit of a third embodiment. A cross-sectional view of the push lever and ejection unit of a fourth ... fifth embodiment. A perspective view showing a cross-section of a portion of the working machine according to a fifth embodiment. A cross-sectional view taken along line G-G in FIG. 16.

[0009] <First embodiment> A work machine according to a first embodiment will be described with reference to the drawings.

[0010] Fig. 1 is an exterior side view of a work machine 10 according to a first embodiment, and Fig. 2 is a cross-sectional view of the work machine 10. Fig. 3 is a perspective view showing a cross section of a portion of the work machine 10. Note that Fig. 3 shows a cross section taken along line A-A in Fig. 1.

[0011] The work machine 10 is, for example, an electric nail gun. When a predetermined condition is met, the work machine 10 ejects a fastener N, such as a nail, and drives it into a mating material G, such as concrete. In the following description, the direction in which the fastener N is ejected may be referred to as the up-down direction. In FIG. 1 , the top of the page is the upside, and the bottom of the page is the downside. The up-down direction may be referred to as the first direction AR1, and one side of the first direction AR1 may be referred to as the downside, and the other side of the first direction AR1 may be referred to as the upside. A direction that intersects with the up-down direction (perpendicular or nearly perpendicular) may be referred to as the front-rear direction. In FIG. 1 , the left side of the page is the front, and the right side of the page is the rear.

[0012] <Overall Configuration> As shown in Figures 1, 2, and 3, the work machine 10 has a housing 11, a biasing unit 12, an ejection unit 13, an impact unit 14, a drive unit 15, a rotation unit 16, a magazine 17, and a control unit 18.

[0013] <Housing 11> The housing 11 is an outer element of the work machine 10. The housing 11 is composed of two housing members that are butted against each other in the left-right direction that intersects the up-down and front-rear directions and are fixed together with screws (not shown). As a result, each component of the work machine 10 is housed inside the housing 11.

[0014] The housing 11 has a cylinder case 20, a motor case 21, a handle 22, and an attachment portion 23. The cylinder case 20 is cylindrical and extends in the vertical direction. The striking portion 14 is housed inside the cylinder case 20. The motor case 21 extends rearward from the lower portion of the cylinder case 20 in the front-to-rear direction. The motor case 21 houses the drive portion 15, which will be described later.

[0015] The handle 22 extends rearward from the center of the cylinder case 20 in the front-to-rear direction. The handle 22 is the part of the housing 11 that the operator grasps. A trigger 24 is provided on the handle 22. The trigger 24 is an operating part that is operated by the operator when driving in the fastener (nail) N. When the operator operates the trigger 24, an ON signal or OFF signal is sent from a trigger switch (not shown) to the control unit 18.

[0016] The mounting portion 23 straddles the rear end of the motor case 21 and the rear end of the handle 22. A battery pack 25 is detachably attached to the mounting portion 23. The mounting portion 23 also houses the control unit 18.

[0017] <Using section 12> The urging section 12 urges the striking section 14 (described later) downward (toward the injection section 13), which is one side in the vertical direction (i.e., the first direction AR1). The urging section 12 is composed of a cylinder 30, a piston chamber 31, a pressure accumulator container 32, etc. A pressure accumulator chamber 32A is formed inside the pressure accumulator container 32. The urging section 12 urges the striking section 14 downward by the pressure of compressed air in the pressure accumulator chamber 32A.

[0018] The cylinder 30 is provided inside the cylinder case 20. The pressure accumulator vessel 32 is provided in the upper part of the interior of the cylinder case 20. A pressure accumulator chamber 32A formed by the pressure accumulator vessel 32 is in communication with the piston chamber 31. The piston chamber 31 and the pressure accumulator chamber 32A are filled with compressed air, an example of high-pressure gas. A damper 33 is provided at the bottom of the cylinder 30. If the pressure in the pressure accumulator chamber 32A drops, air can be sent into the pressure accumulator chamber 32A to increase the pressure in the pressure accumulator chamber 32A to a predetermined pressure.

[0019] The damper 33 is made of, for example, rubber or urethane. When a piston 50 of the striking unit 14 (described later) reaches bottom dead center, the damper 33 comes into contact with the piston 50. This prevents the piston 50 from colliding with the cylinder 30.

[0020] <Injection section 13> The injection section 13 is located below the cylinder case 20. The injection section 13 extends downward from the lower end of the cylinder 30 in the vertical direction. An injection path 40 is provided inside the injection section 13. Fasteners N are supplied one by one to the injection path 40 from a magazine 17 (described later) and are supported within the injection path 40. That is, the fasteners N are supplied to and supported by the injection section 13.

[0021] A push lever 42 is attached to the ejection unit 13. The push lever 42 is held so as to be movable up and down relative to the ejection unit 13. The push lever 42 is also biased downward by a spring (not shown). The push lever 42 abuts against an opposing material G when the work machine 10 is operating. When pressed against the opposing material G, the push lever 42 moves upward relative to the ejection unit 13 against the biasing force of the spring. In other words, the push lever 42 is an abutment part that is able to move relative to the ejection unit 13 in the first direction AR1 by abutting against the opposing material G. The attachment structure of the ejection unit 13 and the push lever 42 will be described in detail below.

[0022] <Striking section 14> The striking section 14 strikes the fastener N, which has been supplied to and supported by the injection section 13, toward an opposing material G on one side (downward side) in the first direction AR1. The striking section 14 has a piston 50 and a driver blade 51.

[0023] <Piston 50> The piston 50 is accommodated in the cylinder 30 so as to be able to reciprocate vertically. That is, the piston 50 is provided in the cylinder 30 so as to be able to reciprocate between top dead center and bottom dead center along the axial direction of the cylinder 30. The piston 50 is also urged downward in the vertical direction by pressure received from the pressure accumulator chamber 32A. The piston 50 defines the interior of the cylinder 30, forming a piston chamber 31. Therefore, the volume of the piston chamber 31 increases and decreases as the piston 50 reciprocates. A seal member (not shown) is provided on the outer peripheral surface of the piston 50. A driver blade 51 is connected to the underside of the piston 50.

[0024] <Driver Blade 51> The driver blade 51 is, for example, a plate-shaped member made of metal. The driver blade 51 extends downward in the vertical direction from the underside of the piston 50. The driver blade 51 is capable of reciprocating within the cylinder 30 together with the piston 50 along an axis AX1 that is parallel to the vertical direction (first direction AR1). This vertical reciprocating motion causes the driver blade 51 to pass through the injection path 40 in the vertical direction. The driver blade 51 moves downward within the injection path 40, striking downward the stoppers N that are sequentially supplied to the injection path 40.

[0025] The driver blade 51 has a shaft 510 extending along the first direction AR1 and a rack 511 formed on the shaft 510. A plurality of racks 511 are arranged in the center of the shaft 510 and protrude in a second direction AR2 intersecting the first direction AR1. In the following description, the second direction AR2 is referred to as the left-right direction, and the side where the racks 511 protrude from the shaft 510 as shown in FIG. 3 may be referred to as the right side, and the side where the racks 511 are not formed may be referred to as the left side. Each of the racks 511 has a groove (groove) 512 (see FIGS. 5 and 6 ) formed on the front surface thereof, extending along the first direction AR1. Specifically, the groove 512 is formed in the rack 511 near the position where it connects to the shaft 510. The rack 511 is engageable with the rotating part 16, which will be described later.

[0026] The driver blade 51 moves upward in the vertical direction by the driving force of the electric motor 60 (described later) via a rotating unit 16 (described later) that engages with the rack 511. Note that the movement of the driver blade 51 to one side (downward) in the vertical direction (first direction AR1) is referred to as "downward." The movement of the driver blade 51 to the other side (upward) in the vertical direction (first direction AR1) is referred to as "upward." Also, while FIG. 3 shows an example in which ten racks 511 are arranged, the number of racks 511 is not limited to the illustrated example.

[0027] <Drive unit 15> The drive unit 15 shown in Figure 2 drives the striking unit 14. The drive unit 15 has an electric motor 60 and a gear case 61. The operation of the drive unit 15 is controlled by the control unit 18, which will be described later. The drive unit 15 operates by receiving power from a battery pack 25, and is capable of moving the striking unit 14 upward against the biasing force of the biasing unit 12.

[0028] The electric motor 60 is housed in the motor case 21. The electric motor 60 is, for example, a brushless motor having a rotor and a stator. The electric motor 60 receives a supply of electric power from the battery pack 25 and rotates.

[0029] The gear case 61 is provided in the motor case 21 on the front side of the electric motor 60. A reduction mechanism having an input element, an output element, and multiple sets of planetary gear mechanisms is provided in the gear case 61. The input element of the reduction mechanism is connected to the rotating shaft (i.e., the rotor) of the electric motor 60, and the input element is rotatably supported by a bearing. The rotational force of the output element of the reduction mechanism in the gear case 61 is transmitted to the rotating part 16, which will be described later.

[0030] <Rotating Unit 16> The rotating unit 16 shown in Figure 3 rotates when it receives a driving force from the electric motor 60, converts the rotational force of the electric motor 60 into a moving force along the vertical direction (first direction AR1), and transmits it to the driver blade 51. The rotating unit 16 has a pinwheel 70 and a pinion pin 71. The pinwheel 70 is provided so as to be rotatable about the same central axis as the rotational axis of the electric motor 60. The pinwheel 70 rotates clockwise or counterclockwise in Figure 3.

[0031] A plurality of pinion pins 71 are provided on the pinwheel 70. Note that, although FIG. 3 shows a case where ten pinion pins 71 are provided, the number of pinion pins 71 is not limited to the illustrated example. The pinion pins 71 are provided at intervals within a predetermined angular range in the rotational direction of the pinwheel 70. The pinion pins 71 can engage and disengage with the rack 511 described above on a one-to-one basis. When at least one pinion pin 71 is engaged with the rack 511, the rotational force of the pinwheel 70 is transmitted to the driver blade 51. When all of the pinion pins 71 are disengaged from the rack 511, the rotational force of the pinwheel 70 is not transmitted to the driver blade 51.

[0032] <Magazine 17> As shown in FIGS. 1 and 2, the magazine 17 is disposed below the handle 22 and the motor case 21 (i.e., the electric motor 60) in the first direction AR1. The magazine 17 accommodates a plurality of connected fasteners N. The fasteners N are connected to one another by connecting elements such as adhesive, resin, or the like. The fasteners N accommodated in the magazine 17 are moved by a supply mechanism (not shown) along a direction (third direction AR3) along the front-rear direction intersecting the first direction AR1 and the second direction AR2, and supplied into the injection path 40. That is, among the fasteners N accommodated in the magazine 17, the fastener N located at the head of the connecting elements is supplied so as to be positioned below the driver blade 51.

[0033] <Control unit 18> The control unit 18 is a microcomputer having an input port, an output port, an arithmetic processing unit, and a memory unit. The control unit 18 is electrically connected to a trigger switch by wiring. When the operator operates the trigger 24, the trigger switch outputs an electrical signal (on signal or off signal) to the control unit 18.

[0034] <Battery Pack 25> The battery pack 25 is detachably attached to the attachment portion 23 and is a DC power supply that supplies power to the electric motor 60 and other components. The battery pack 25 has a housing case and a plurality of battery cells housed within the housing case. The battery cells are secondary batteries that can be charged and discharged, and any of the following can be used: lithium-ion batteries, nickel-metal hydride batteries, lithium-ion polymer batteries, and nickel-cadmium batteries.

[0035] <Attachment structure between injection unit 13 and push lever 42> Figure 4 is a partially enlarged view showing an enlarged area included in region R1 shown in Figure 2. Figure 5 is a cross-sectional view taken along line B-B in Figure 4. Figure 6 is a cross-sectional view taken along line CC in Figure 4. Note that Figure 4 shows a state in which the push lever 42 abuts against and is pushed into the mating material G, i.e., a state in which the push lever 42 has moved upward relative to the injection unit 13.

[0036] As shown in Fig. 4, the above-mentioned injection section 13 has a first blade guide 130 and a second blade guide 131. The first blade guide 130 is cylindrical and extends along the first direction AR1. An attachment opening 132 is formed on the rear side of the first blade guide 130. The second blade guide 131 is fitted into this attachment opening 132 and fixed with a fastener such as a screw, thereby attaching the second blade guide 131 to the first blade guide 130.

[0037] The second blade guide 131 is a side surface of the injection unit 13 to which the magazine 17 is connected. Specifically, the magazine 17 is connected to the rear side of the second blade guide 131 (one side in the third direction AR3). The second blade guide 131 has a front side surface 131A that intersects (orthogonal or nearly orthogonal to) the third direction AR3. A supply port 133 is formed in the front side surface 131A of the second blade guide 131. The supply port 133 is a through-hole that penetrates the front side surface 131A in the front-rear direction. The supply port 133 has a long side that extends along the first direction AR1 (up-down direction). The fasteners N stored in the magazine 17 are supplied into the injection path 40 through this supply port 133. In other words, the injection unit 13 has the supply port 133 in the second blade guide 131, through which the fasteners N are supplied from outside.

[0038] The push lever 42 extends along the first direction AR1 and is integrally molded with a head portion 421 and an arm portion 422. The arm portion 422 is formed above the head portion 421. At least a portion of the push lever 42 is disposed inside the ejection unit 13. More specifically, at least the arm portion 422 of the push lever 42 is disposed inside the ejection unit 13.

[0039] The head portion 421 is cylindrical and centered on an axis AX1 along the first direction AR1. A lower portion of the head portion 421 protrudes downward relative to the injection portion 13. The lower end of the head portion 421 abuts against a mating material G when the work machine 10 is operating. The inside of the head portion 421 is an injection path 40 through which the fastener N passes.

[0040] When the push lever 42 is attached, the arm portion 422 is disposed inside the ejection unit 13. The arm portion 422 is formed by a first guide portion 423, a second guide portion 424, and a third guide portion 425, which extend along the first direction AR1 from the upper end of the head portion 421. The first guide portion 423 is formed forward of the axis AX1 (on the other side in the third direction AR3).

[0041] The second guide portion 424 is connected to the left end of the first guide portion 423 and is formed to the left of the axis AX1 (on one side in the second direction AR2). As shown in Figures 5 and 6, the rear end of the second guide portion 424 is located near the front side surface 131A of the second blade guide 131.

[0042] The third guide portion 425 is connected to the right end of the first guide portion 423 and is formed to the right of the axis AX1 (the other side in the second direction AR2). The rear end of the third guide portion 425 is farther away from the front side surface 131A of the second blade guide 131 than the rear end of the second guide portion 424. In other words, the third guide portion 425 is a rib that protrudes rearward from the right end of the first guide portion 423.

[0043] The inner wall surfaces of the first guide portion 423, the second guide portion 424, and the third guide portion 425 are formed so as to be flush with the inner wall surfaces on the front, left, and right sides, respectively, of the cylindrical head portion 421. That is, no steps or gaps are formed on the inner wall surfaces on the front, left, and right sides of the push lever 42. Furthermore, when the push lever 42 is pushed in, the upper ends of the first guide portion 423, the second guide portion 424, and the third guide portion 425 (i.e., the upper end 42A of the arm portion 422 of the push lever 42) are positioned above the upper end 133A of the supply port 133 shown in FIG. 4 in the first direction AR1.

[0044] Since the arm portion 422 is formed by the first guide portion 423, the second guide portion 424, and the third guide portion 425, the arm portion 422 has a shape in which the front wall surface, the left wall surface, and a portion of the right wall surface of the cylindrical head portion 421 extend along the first direction AR1. In other words, the arm portion 422 is a portion of the cylindrical push lever 42 in which notches are formed in the rear wall surface and a portion of the right wall surface.

[0045] Because the arm portion 422 has the above-described shape, the area surrounded by the insides of the first guide portion 423, the second guide portion 424, and the third guide portion 425 and the second blade guide 131 becomes the ejection path 40. In other words, the ejection path 40 is defined by the push lever 42 and the ejection portion 13. The shaft portion 510 of the driver blade 51 and the fastener N move within this ejection path 40 along the first direction AR1. In other words, with respect to the fastener N supplied into the ejection path 40, the first guide portion 423 is located in front (the other side in the third direction AR3), the second guide portion 424 is located to the left of the fastener N (one side in the second direction AR2), and the third guide portion 425 is located to the right of the fastener N (the other side in the second direction AR2).

[0046] As shown in FIGS. 5 and 6 , the fastener N supplied to and passing through the injection path 40 contacts the inner wall surface of the push lever 42 and the second blade guide 131. Specifically, on the front side, the front side surface of the fastener N contacts the first guide portion 423, and on the left side, the left side surface of the fastener N contacts the second guide portion 424. Also, on the front right side, the front right side surface of the fastener N contacts the third guide portion 425. On the rear side (one side in the third direction AR3), the rear side surface of the fastener N contacts the front side surface 131A of the second blade guide 131. Therefore, when the fastener N passes through the injection path 40, the fastener N is guided by the push lever 42 and the second blade guide 131 and moves to one side (downward) in the first direction AR1.

[0047] A rack 511 formed on the shaft portion 510 of the driver blade 51 protrudes outward from the push lever 42 through the space between the third guide portion 425 and the second blade guide 131. That is, the rack 511, which is a protruding portion, protrudes outward from the injection path 40 on the other side (rightward) in the second direction AR2. In the rack 511 protruding outward from the injection path 40, the third guide portion 425, which is a rib, enters and fits into a groove (groove portion) 512 formed in the rack 511. As shown in FIGS. 5 and 6 , the groove 512 is recessed in the third direction AR3 further than the rack 511, which is a protruding portion.

[0048] <Operation of Work Machine 10> An example of the operation of the work machine 10, which is a nail gun, will be described below when the work machine 10 is used to drive a nail, which is a fastener N, into a mating material G. The control unit 18 controls the electric motor 60 so that power is not supplied when at least one of the trigger switch and a sensor (not shown) that detects the depression of the push lever 42 is off.

[0049] The operator applies an operating force to the trigger 24 and performs a pushing operation to press the push lever 42 against the target material G. When the pushing operation is performed, the push lever 42 moves upward relative to the injection unit 13 along the first direction AR1. The pushing operation moves the push lever 42 upward and reaches a position where the sensor is turned on.

[0050] 4 , when the push lever 42 is positioned on the other side (upper) in the first direction AR1, the upper end of the push lever 42 in the first direction AR1 is positioned higher in the first direction AR1 than the upper end 133A in the first direction AR1 of the supply port 133. In other words, the upper end 42A of the first guide portion 423, the second guide portion 424, and the third guide portion 425 that constitute the arm portion 422 of the push lever 42 is positioned higher than the upper end of the stopper N.

[0051] When the trigger switch is turned on and the sensor that detects the pushing operation of the push lever 42 is turned on, the control unit 18 controls the battery pack 25 to supply power to the electric motor 60. When the electric motor 60 receives the power and starts to rotate, the rotational force is transmitted to the rotating unit 16. The pinion pin 71 of the rotating unit 16 engages with the rack 511 of the driver blade 51, and the rotational force is transmitted to the driver blade 51 as a driving force directed upward in the first direction AR1. The driver blade 51 then rises against the biasing force of the biasing unit 12. In other words, the rotating unit 16 rotates while engaged with the rack 511, which is a protruding portion, thereby moving the driver blade 51 of the striking unit 14 to the other side (upward) in the first direction AR1 against the biasing force of the biasing unit 12.

[0052] When the driver blade 51 reaches the top dead center and the engagement between the pinion pin 71 and the rack 511 is released, the rotational force is no longer transmitted to the driver blade 51. As a result, the driver blade 51 descends due to the pressure in the pressure accumulator chamber 32A. In other words, by releasing the engagement between the rotating portion 16 and the rack 511, which is a protruding portion, the driver blade 51 of the striking portion 14 is allowed to move to one side (downward) in the first direction AR1 by the biasing force of the biasing portion 12.

[0053] The driver blade 51 passes through the injection path 40 and strikes the stopper N, which is supplied to and supported by the injection path 40, to one side (downward) in the first direction AR1. As described above, the upper ends 42A of the first guide portion 423, second guide portion 424, and third guide portion 425 that constitute the arm portion 422 of the push lever 42 are positioned higher than the upper end of the stopper N. Therefore, the stopper N can move along the first direction AR1 without colliding with the upper end portion 42A of the push lever 42.

[0054] As described above, no steps or gaps are formed on the inner wall surfaces of the front, left, and right sides of the push lever 42. Specifically, the fastener N is guided in the first direction AR1 by the first guide portion 423 at the front, guided in the first direction AR1 by the second blade guide 131 at the rear, and guided in the first direction AR1 by the second guide portion 424 at the left. That is, the fastener N is prevented from being obstructed from moving downward along the first direction AR1 within the injection path 40. In addition, a portion of the right side surface of the fastener N is in contact with the third guide portion 425, which is a rib. Therefore, the third guide portion 425 restricts the movement of the fastener N in the first direction. As a result, the fastener N is struck by the driver blade 51 and driven into the target material G.

[0055] According to the first embodiment described above, at least one of the following advantageous effects can be obtained.

[0056] (1) The work machine 10 includes a push lever 42, which is an abutment part that can move relative to the ejection part 13 in the first direction AR1 by abutting against the mating material G. The ejection part 13 has a second blade guide 131, which is a side surface having a supply port 133 through which fasteners N are supplied from the outside. The arm part of the push lever 42 is disposed within the ejection part 13. When the push lever 42 is positioned on the other side (upper) of the first direction AR1, the upper end 42A of the arm part 422 in the first direction AR1 is positioned higher in the first direction AR1 than the upper end 133A of the supply port 133 in the first direction AR1. As a result, during the driving operation of the work machine 10, the fastener N is guided by the push lever 42 from the time it starts moving downward in the first direction AR1 until it is ejected from the work machine 10. In this embodiment, the push lever 42 is not attached to the outside of the ejection part 13. Therefore, there are no steps or gaps, etc., inside the injection path 40 through which the fastener N passes, which are associated with the attachment of the injection portion 13 and the push lever 42. As a result, the fastener N is prevented from getting caught on steps or gaps, etc., inside the injection path 40, and from being bent, which prevents the fastener N from becoming clogged inside the injection path 40. Therefore, it is possible to improve the workability when working with the work machine 10.

[0057] (2) The magazine containing the fasteners N to be supplied to the ejection unit 13 is connected to a second blade guide 131 having a supply port 133 on one side (rear) of the third direction AR3. The push lever 42 extends along the first direction AR1 on the other side (front) of the third direction AR3 and has a first guide portion 423 located on the other side (front) of the third direction AR3 relative to the fasteners N supplied to the ejection unit 13, guiding the movement of the fasteners N along the first direction AR1. As a result, during the driving operation of the work machine 10, the fasteners N are guided forward by the first guide portion 423 and the inner wall surface on the front side of the head portion 421 from the time they start moving downward along the first direction AR1 until they are ejected from the work machine 10. The fasteners N are supplied into the ejection path 40 from the magazine 17 located behind the ejection unit 13 and are supported in the ejection path 40 while being biased forward by a supply mechanism (not shown). As a result, the fastener N, to which a force is acting forward, moves through the injection path 40. As described above, the wall surface on the front side of the injection path 40 is the same wall surface formed by the first guide portion 423 and the inner wall surface on the front side of the head portion 421. As a result, there is no step or gap on the inner wall surface of the push lever 42 on the front side of the fastener N, so the fastener N, to which a force is acting forward, is prevented from getting caught and bending. This prevents the fastener N from becoming clogged in the injection path 40, making it possible to improve workability when using the work machine 10.

[0058] (3) The push lever 42 extends along the first direction AR1 on one side (left side) of the second direction AR2. The second guide portion 424 is located to the left of the second direction AR2 relative to the fastener N supplied to the injection unit 13 and guides the movement of the fastener N along the first direction AR1. As a result, during the driving operation of the work machine 10, the fastener N is guided forward by the second guide portion 424 and the inner wall surface on the right side of the head portion 421 from the time it starts moving downward along the first direction AR1 until it is injected from the work machine 10. As a result, there are no steps or gaps on the inner wall surface of the push lever 42 to the right of the fastener N moving within the injection path 40, preventing the right side of the fastener N from getting caught or bending. This prevents the fastener N from clogging within the injection path 40, improving workability during operation using the work machine 10.

[0059] (4) The second blade guide 131 is located on one side (rear) of the fastener N supplied to the injection unit 13 in the third direction AR3 and guides the movement of the fastener N along the first direction AR1. As a result, the rear of the fastener N is guided by the second blade guide 131, and the fastener N can move smoothly along the first direction AR1 within the injection path 40.

[0060] (5) The rack 511, which is a protrusion provided on the driver blade 51, protrudes to the other side (right side) in the second direction AR2, outside the ejection path 40 defined by the push lever 42 and the ejection part 13. This allows the push lever 42 to be smaller in the left-right direction compared to when the push lever 42 has a shape that can accommodate the shaft part 510 and rack 511 of the driver blade 51 inside. In addition, dust and the like adhering to the rack 511 of the driver blade 51 are prevented from accumulating in the ejection path 40.

[0061] (6) The push lever 42 has a third guide portion 425, which is a rib that enters and fits into the groove 512 formed in the rack 511. The third guide portion 425 restricts the movement of the stopper N in the first direction AR1. This prevents the stopper N from protruding from the opening formed on the left side of the push lever 42 along the first direction AR1, contributing to smooth movement of the stopper N in the first direction AR1.

[0062] <Second embodiment> A work machine of a second embodiment will be described. Below, the same components as those of the work machine 10 of the first embodiment will be assigned the same reference numerals, and differences from the first embodiment will be mainly described. Points that are not particularly described are the same as those of the first embodiment. In the second embodiment, the shapes of the push lever and the ejection portion are different from the shapes of the push lever 42 and the ejection portion 13 of the first embodiment. These will be described in detail below.

[0063] Fig. 7 is a plan view showing the appearance of the push lever 80 and the ejection portion 90 of the second embodiment as seen from the front. Fig. 8 is a cross-sectional view taken along line D-D in Fig. 7. Fig. 9 is a cross-sectional view taken along line E-E in Fig. 8. Fig. 10 is a cross-sectional view taken along line F-F in Fig. 8.

[0064] The emission section 90 has a first blade guide 130 similar to that of the first embodiment, and a second blade guide 901 that is fitted into and attached to the attachment opening 132 of the first blade guide 130. The second blade guide 901 has a first protruding wall surface 901A and a second protruding wall surface 901B on the front side of the front side surface 131A.

[0065] The first protruding wall surface 901A is formed to the left of the supply port 133 (one side in the second direction AR2) and extends along the first direction AR1. The first protruding wall surface 901A protrudes forward and abuts against a contact plane 130A formed on the first blade guide 130.

[0066] The second protruding wall surface 901B is formed to the right of the supply port 133 (the other side in the second direction AR2) and extends along the first direction AR1. The second protruding wall surface 901B protrudes forward. However, the forward protrusion amount (height) of the second protruding wall surface 901B is smaller than the forward protrusion amount (height) of the first protruding wall surface 901A. In other words, the second protruding wall surface 901B is a rib protruding forward from the front side surface 131A. Note that the upper ends of the first protruding wall surface 901A and the second protruding wall surface 901B (i.e., the upper end 901C of the second blade guide 901) are located above the upper end 133A of the supply port 133.

[0067] The push lever 80 is integrally molded with the head portion 421, which is the same as in the first embodiment, and the arm portion 801, which is connected to the head portion 421 and extends along the first direction AR1. The arm portion 801 is formed only by the first guide portion 423 of the first embodiment. That is, the arm portion 801 is formed forward with respect to the axis line AX1 (the other side in the third direction AR3). Note that, in the second embodiment as well, the upper end portion 42A of the push lever 80 is positioned above the upper end portion 133A of the supply port 133 in the first direction AR1 when the push lever 80 is pushed in.

[0068] Because the arm portion 801 of the push lever 80 and the second blade guide 901 have the above-described shapes, the area surrounded by the front side surface 131A, the first protruding wall surface 901A, the second protruding wall surface 901B, and the arm portion 801 becomes the ejection path 40. In other words, the ejection path 40 is defined by the push lever 80 and the ejection portion 90. The driver blade 51 and the stopper N pass through this ejection path 40, as in the first embodiment.

[0069] As shown in FIG. 10 , the fastener N supplied to and passing through the injection path 40 contacts the inner wall surface of the push lever 80 and the second blade guide 901. Specifically, on the front side, the front side surface of the fastener N contacts the arm portion 801, and on the left side, the left side surface of the fastener N contacts the first protruding wall surface 901A. Also, on the rear right side, the rear right side surface of the fastener N contacts the second protruding wall surface 901B. On the rear side, the rear side surface of the fastener N contacts the front side surface 131A of the second blade guide 131. Therefore, when the fastener N passes through the injection path 40, the fastener N moves downward, guided by the push lever 80 and the second blade guide 901. That is, the first protruding wall surface 901A of this embodiment guides the movement of the fastener N along the first direction AR1, similar to the second guide portion 424 of the first embodiment.

[0070] In the second embodiment, the rack 511 formed on the shaft portion 510 of the driver blade 51 protrudes to the outside of the push lever 80 through the space between the second protruding wall surface 901B and the first blade guide 130. That is, the rack 511, which is a protruding portion, protrudes to the outside of the injection path 40. In the rack 511 protruding to the outside of the injection path 40, the second protruding wall surface 901B, which is a rib, enters a groove 512 formed in the rack 511. In the second embodiment, the groove 512 is formed on the surface of the rear side of the rack 511, unlike in the first embodiment.

[0071] According to the second embodiment described above, it is possible to obtain the same effects (1) to (6) as those obtained by the first embodiment.

[0072] <Third Embodiment> A work machine according to a third embodiment will be described. Below, the same components as those of the work machine 10 of the first and second embodiments will be assigned the same reference numerals, and differences from the first and second embodiments will be mainly described. Points that are not specifically described are the same as those of the first and second embodiments. In the third embodiment, the shapes of the push lever and ejection portion differ from those of the push levers 42, 80 and ejection portions 13, 90 of the first and second embodiments. These will be described in detail below.

[0073] The push lever and injection portion of the third embodiment have the same appearance as the second embodiment shown in Fig. 7, and have the same cross section as the second embodiment shown in Fig. 8. Fig. 11 is a cross-sectional view taken at a position similar to that of Fig. 9 described above, and Fig. 12 is a cross-sectional view taken at a position similar to that of Fig. 10 described above.

[0074] The injection unit 91 of the third embodiment includes a first blade guide 130 similar to those of the first and second embodiments, and a second blade guide 910 fitted into the mounting opening 132 of the first blade guide 130. The second blade guide 910 includes a second protruding wall surface 901B similar to that of the second embodiment on the front side of the front side surface 131A. However, the second blade guide 910 does not include the first protruding wall surface 901A of the second embodiment. That is, the second blade guide 910 includes a rib that protrudes forward from the front side surface 131A on the right side of the supply port 133. Note that, in the third embodiment as well, the upper end 901C of the second protruding wall surface 901B is located above the upper end 133A of the supply port 133.

[0075] The push lever 81 of the third embodiment is integrally molded with the head portion 421, similar to that of the first embodiment, and an arm portion 810 that is connected to the head portion 421 and extends along the first direction AR1. The arm portion 810 is formed by the first guide portion 423 and the second guide portion 424 of the first embodiment. That is, the arm portion 810 is formed forward and to the left of the axis AX1. Note that, in the third embodiment as well, the upper end portion 42A of the push lever 81 is positioned above the upper end portion 133A of the supply port 133 in the first direction AR1 when the push lever 81 is pushed in.

[0076] Because the arm portion 810 of the push lever 81 and the second blade guide 910 have the above-described shapes, the area surrounded by the front side surface 131A, the second protruding wall surface 901B, and the first guide portion 423 and the second guide portion 424 of the arm portion 810 becomes the ejection path 40. In other words, the ejection path 40 is defined by the push lever 81 and the ejection portion 91. The driver blade 51 and the stopper N pass through this ejection path 40, as in the first and second embodiments.

[0077] 12 , the fastener N supplied to and passing through the injection path 40 comes into contact with the inner wall surface of the push lever 81 and the second blade guide 910. Specifically, on the front side, the front side surface of the fastener N comes into contact with the first guide portion 423 of the arm portion 810, and on the left side, the left side surface of the fastener N comes into contact with the second guide portion 424 of the arm portion 810. Furthermore, on the rear right side, the rear right side surface of the fastener N comes into contact with the second protruding wall surface 901B. On the rear side, the rear side surface of the fastener N comes into contact with the front side surface 131A of the second blade guide 910. Therefore, when the fastener N passes through the injection path 40, the fastener N moves downward while being guided by the push lever 81 and the second blade guide 910.

[0078] In the third embodiment, as in the second embodiment, in the rack 511 that protrudes outside the injection path 40, the second protruding wall surface 901B, which is a rib, enters the groove 512 formed in the rack 511.

[0079] According to the third embodiment described above, it is possible to obtain the same effects (1) to (6) as those obtained by the first embodiment.

[0080] <Fourth Embodiment> A work machine according to the fourth embodiment will be described. Hereinafter, the same components as those of the work machine 10 of the first, second, and third embodiments will be assigned the same reference numerals, and differences from the first, second, and third embodiments will be mainly described. Points not specifically described are the same as those of the first, second, and third embodiments. In the fourth embodiment, the shapes of the push lever and ejection portion differ from those of the push levers 42, 80, and 81 and ejection portions 13, 90, and 91 of the first, second, and third embodiments. These will be described in detail below.

[0081] The push lever and injection portion of the fourth embodiment have the same appearance as the second embodiment shown in Fig. 7. Fig. 13 is a cross-sectional view taken at a position similar to that of Fig. 8 described above, Fig. 14 is a cross-sectional view taken at a position similar to that of Fig. 9 described above, and Fig. 15 is a cross-sectional view taken at a position similar to that of Fig. 10 described above.

[0082] The injection section 92 of the fourth embodiment has a first blade guide 920 and a second blade guide 131 similar to that of the first embodiment. The first blade guide 920 is cylindrical and extends along the first direction AR1, similar to that of the first embodiment. An attachment opening 132 similar to that of the first embodiment is formed on the rear side of the first blade guide 920.

[0083] A third protruding wall surface 920A is provided inside the first blade guide 920, extending along the first direction AR1 and protruding rearward, i.e., toward the second blade guide 131. The third protruding wall surface 920A is provided to the right of the axis AX1, i.e., to the right of the supply port 133 formed in the second blade guide 131. However, the third protruding wall surface 920A does not abut against the front side surface 131A of the second blade guide 131. In other words, the third protruding wall surface 920A is located to the right of the supply port 133 and is a rib that protrudes toward the second blade guide 131. Furthermore, as shown in FIG. 13 , an upper end 901D of the third protruding wall surface 920A is located above an upper end 133A of the supply port 133.

[0084] The push lever 82 of the fourth embodiment is integrally molded with a head portion 421 similar to that of the first embodiment and an arm portion 810 similar to that of the third embodiment and connected to the head portion 421. That is, in the fourth embodiment, the arm portion 810 is also formed by the first guide portion 423 and the second guide portion 424 of the first embodiment. That is, the arm portion 810 is formed forward and leftward with respect to the axis AX1.

[0085] However, the right end of the first guide portion 423 abuts against the left side wall surface of the third protruding wall surface 920A. That is, the third protruding wall surface 920A protrudes further rearward than the first guide portion 423. Note that, in the fourth embodiment as well, the upper end 42A of the push lever 82 is positioned above the upper end of the supply port 133 in the first direction AR1 when the push lever 82 is pushed in.

[0086] Because the arm portion 810 of the push lever 82, the first blade guide 920, and the second blade guide 131 have the above-described shapes, the area surrounded by the front side surface 131A, the third protruding wall surface 920A, and the first guide portion 423 and the second guide portion 424 of the arm portion 810 becomes the ejection path 40. In other words, the ejection path 40 is defined by the push lever 82 and the ejection portion 92. The driver blade 51 and the stopper N pass through this ejection path 40, as in the first, second, and third embodiments.

[0087] 15 , the fastener N supplied to and passing through the injection path 40 comes into contact with the inner wall surface of the push lever 82, the first blade guide 920, and the second blade guide 131. Specifically, on the front side, the front side surface of the fastener N comes into contact with the first guide portion 423 of the arm portion 810, and on the left side, the left side surface of the fastener N comes into contact with the second guide portion 424 of the arm portion 810. Also, on the front right side, the front right side surface of the fastener N comes into contact with the third protruding wall surface 920A. On the rear side, the rear side surface of the fastener N comes into contact with the front side surface 131A of the second blade guide 131. Therefore, when the fastener N passes through the injection path 40, the fastener N moves downward while being guided by the push lever 82, the first blade guide 920, and the second blade guide 131.

[0088] In the fourth embodiment, too, in the rack 511 protruding out of the injection path 40 , the third protruding wall surface 920A, which is a rib, enters the groove 512 formed in the rack 511 .

[0089] According to the fourth embodiment described above, it is possible to obtain the same effects (1) to (6) as those obtained by the first embodiment.

[0090] Fifth Embodiment A description will be given of a dust collection structure provided in the work machine 10 of the first embodiment. Note that the fifth embodiment will be described using the work machine 10 of the first embodiment, but the dust collection mechanism may also be applied to the work machine 10 of the second, third, or fourth embodiment.

[0091] Fig. 16 is a partial cross-sectional view showing an enlarged view of the vicinity of the injection unit 13 of the work machine 10 as viewed from the right. Fig. 17 is a partial enlarged view showing an enlarged view of a part of Fig. 3. Fig. 18 is a cross-sectional view taken along line G-G in Fig. 16.

[0092] A dust collection mechanism 95 is formed in the injection section 13. The dust collection mechanism 95 collects or discharges to the outside dust generated by the driving operation of the work machine 10. The dust collection mechanism 95 has a recess 951 and a discharge port 952 formed in the first blade guide 130.

[0093] The recess 951 is formed on the inner wall surface on the rear side of the first blade guide 130, below the mounting opening 132 of the first blade guide 130. That is, the recess 951 is formed between the first blade guide 130 and the second blade guide 131, near the position where the rack 511 of the driver blade 51 passing through as it moves in the upper first direction AR1. The discharge port 952 is an opening formed on the rear side of the first blade guide 130, and is a through-hole that connects the recess 951 to the outside of the first blade guide 130.

[0094] The dust that accumulates in the recess 951 is a mixture of, for example, concrete powder generated from the mating material G due to the driving operation of the work machine 10, connecting elements that connect multiple fasteners N that have been dissolved by the operation of the driver blade 51, and lubricating oil from various parts inside the work machine 10. To remove such dust, first, the second blade guide 131 is removed from the first blade guide 130 of the ejection unit 13. Then, by blowing air or the like toward the recess 951 of the first blade guide 130, the dust that has accumulated in the recess 951 is discharged to the outside through the outlet 952. As a result, the ejection unit 13 can be easily cleaned and maintained.

[0095] Although various embodiments and modifications have been described above, the present invention is not limited to these. Other embodiments that are conceivable within the scope of the technical idea of ​​the present invention are also included within the scope of the present invention.

[0096] 10 working machine, 11 housing, 12 biasing portion, 13, 90, 91, 92 injection portion, 14 impact portion, 15 drive portion, 16 rotating portion, 17 magazine, 30 cylinder, 32 pressure accumulator container, 32A pressure accumulator chamber, 40 injection path, 42 push lever, 42A, 901C, 901D upper end portion, 51 driver blade, 60 electric motor, 71 pinion pin, 80, 81, 82 push lever, 130, 920 first blade guide, 131 , 901, 910 second blade guide, 131A front side, 133 supply port, 133A upper end, 421 head portion, 422, 801, 810 arm portion, 423 first guide portion, 424 second guide portion, 425 third guide portion, 510 shaft portion, 511 rack, 512 groove, 901A first protruding wall surface, 901B second protruding wall surface, 920A third protruding wall surface, AR1 first direction, AR2 second direction, AR3 third direction, G mating material, N fastener (nail)

Claims

1. A device comprising: an ejection section that supports a fastener; an impact section that impacts the fastener supported by the ejection section to one side in a first direction; a biasing section that biases the impact section to one side in the first direction; a motor; a rotating section that rotates by receiving driving force from the motor; and an abutment section that is movable in the first direction relative to the ejection section by abutting against an opposing material, wherein the impact section has a shaft section that extends in the first direction, and a protruding section that protrudes from the shaft section in a second direction that intersects with the first direction and is engageable with the rotating section, wherein the rotating section rotates while engaged with the protruding section, thereby moving the impact section to the other side in the first direction against the biasing force of the biasing section, and wherein the engagement with the protruding section is released, thereby allowing the impact section to move to one side in the first direction by the biasing force of the biasing section, and wherein the ejection section is tubular and extends in the first direction, and has a supply port on its side through which the fastener is supplied from outside, The abutment portion has an arm portion that is arranged within the injection portion, and when the abutment portion is positioned on the other side of the first direction, the end portion of the arm portion on the other side of the first direction is positioned on the other side of the first direction of the end portion of the supply port on the other side of the first direction.

2. A work machine as described in claim 1, further comprising a magazine for storing the fasteners to be supplied to the ejection section, the magazine being connected to the side surface having the supply port on one side of a third direction along which the fasteners are supplied to the ejection section, and the abutment section extending along the first direction on the other side of the third direction, and having a first guide section located on the other side of the third direction relative to the fasteners supplied to the ejection section, for guiding the movement of the fasteners along the first direction.

3. A work machine as described in claim 2, wherein the abutment portion or the ejection portion extends along the first direction on one side of the second direction intersecting with the third direction, and has a second guide portion located on one side of the second direction relative to the stopper supplied to the ejection portion, and guiding the movement of the stopper along the first direction.

4. A work machine as described in claim 3, wherein the side surface is positioned on one side of the stopper supplied to the injection section in the third direction and guides the movement of the stopper along the first direction.

5. A work machine as set forth in claim 4, wherein the abutment portion and the ejection portion define an ejection path along which the stopper moves in the first direction, and the protrusion portion protrudes outside the ejection path on the other side in the second direction.

6. A work machine as set forth in claim 5, wherein a groove is formed in the protruding portion, and the contact portion or the ejection portion has a rib that enters the groove, and the rib restricts movement of the stopper in the first direction.

7. A work machine comprising: an ejection section that supports a stopper; an impact section that impacts the stopper supported by the ejection section to one side in a first direction; a biasing section that biases the impact section to one side in the first direction; a motor; a rotating section that rotates by receiving driving force from the motor; and an abutment section that is movable in the first direction relative to the ejection section by abutting against an opposing material, wherein the impact section has a shaft section that extends in the first direction, a protruding section that protrudes from the shaft section in a second direction intersecting the first direction and is engageable with the rotating section, and a groove section that is formed in the protruding section and is recessed in a third direction intersecting the first direction and the second direction, and wherein the abutment section has a rib that enters the groove section.

Images