Work machine

Abstract

The present invention improves the driving precision of a work machine without increasing the size of the work machine. A driving machine 1 according to one embodiment has: an ejector 6 that accommodates a fastener 40; and a driver blade 20 that can move back and forth in a first direction and a second direction that is opposite the first direction and strikes the fastener 40 accommodated in the ejector 6 by moving in the first direction. The ejector 6 comprises: a blade guide 50 that forms one side of an ejection path 6a to which the fastener 40 is supplied; a guide plate 60 that is opposite the blade guide 50 and forms another side of the ejection path 6a; and a protrusion 56 that is provided to the blade guide 50. The driver blade 20 comprises a recess that receives the protrusion 56. The protrusion 56 is positioned to the side of the fastener 40 as supplied to the ejection path 6a and keeps all or a portion of the fastener 40 from leaving the ejection path 6a.

Description

Work equipment

[0001] The present invention relates to a work machine suitable for work of fastening or joining mating members.

[0002] One example of such a work machine is a driving machine that drives a fastener into a mating material. Patent Document 1 describes a driving machine that has a nose portion that forms an injection path and a driver blade that reciprocates within the injection path. The fastener is fed into the injection path formed by the nose portion. The fastener fed into the injection path is struck by the driver blade and driven into the mating material.

[0003] JP 2018-34258 A

[0004] Because the driver blade reciprocates within the injection path formed by the nose, it is necessary to avoid contact (interference) between the nose and the driver blade. As a result, the shape of the nose is restricted, which can lead to insufficient positioning of the fastener within the injection path. In this case, the fastener may tilt or deform due to the impact of the impact, which can reduce the driving accuracy.

[0005] On the other hand, if a restricting portion or the like is provided on the nose portion to prevent the stopper from tilting or deforming, there is a risk that the driver blade will become longer in order to avoid contact (interference) between the restricting portion and the driver blade. Furthermore, the longer driver blade may result in the overall size of the work machine becoming larger.

[0006] An object of the present invention is to improve the driving accuracy of a work machine while avoiding an increase in size of the work machine.

[0007] A driving tool according to one embodiment includes an injection unit that accommodates fasteners, and an impact unit that is reciprocable between a first direction and a second direction opposite the first direction and that strikes the fasteners accommodated in the injection unit by moving in the first direction. The injection unit includes a first wall that forms one side of an injection path through which the fasteners are supplied, a second wall that faces the first wall and forms the other side of the injection path, and a convex portion provided on at least one of the first wall and the second wall. The impact unit includes a concave portion that receives the convex portion. The convex portion is positioned to the side of the fastener supplied to the injection path and prevents all or part of the fastener from coming off the injection path.

[0008] According to the present invention, it is possible to improve the driving accuracy of the work machine while avoiding an increase in size of the work machine.

[0009] 10 is a left side view of the driving machine. FIG. 11 is a front view of the driving machine. FIG. 12 is a cross-sectional view of the driving machine. FIG. 13 is another cross-sectional view of the driving machine. FIG. 14 is a front perspective view of the driver blade. FIG. 15 is a rear perspective view of the driver blade. FIG. 16 is an enlarged perspective view of the ejection section. FIG. 17 is an enlarged perspective view of the blade guide. FIG. 18 is an enlarged perspective view of the guide plate. FIG. 19 is a cross-sectional view showing the ejection section when the driver blade is in the standby position. FIG. 20 is a cross-sectional view showing the ejection section when the driver blade is at the top dead center. FIG. 21 is a cross-sectional view showing the ejection section when the driver blade is at the bottom dead center. FIG. 22 is a partially enlarged cross-sectional view taken along line CC in FIG. 9. FIG. 23 is a partially enlarged cross-sectional view taken along line DD in FIG. 24. FIG. 25 is a partially enlarged cross-sectional view showing another example of an embodiment. FIG. 26 is a partially enlarged cross-sectional view showing yet another example of an embodiment.

[0010] First Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Note that in all drawings referred to in describing the embodiment, the same or substantially the same configurations and elements will be designated by the same reference numerals. Furthermore, as a general rule, configurations and elements that have already been described will not be described again.

[0011] <Overview of the driving machine> The working machine according to this embodiment is a driving machine suitable for work of fastening or joining mating materials. Fig. 1 is a left side view of the driving machine 1 according to this embodiment. Fig. 2 is a front view of the driving machine 1 according to this embodiment.

[0012] The driving tool 1 has a cylinder housing 2, a handle 3, a motor housing 4, a magazine 5, and an ejection unit 6. The cylinder housing 2 is generally cylindrical overall. The handle 3 and the motor housing 4 extend in a direction intersecting the cylinder housing 2, with one end connected to the cylinder housing 2. Meanwhile, the other end of the handle 3 and the motor housing 4 is connected to a connection unit 7. From another perspective, the rear ends of the handle 3 and the motor housing 4 are connected to each other via the connection unit 7.

[0013] A battery attachment section into which a battery 8 can be attached and detached is provided on the back surface of the connection section 7. The battery 8 is the power source for the electric motor 30, which will be described later. There are no particular limitations on the type of battery 8, but the battery 8 in this embodiment is a lithium-ion battery. Other examples of the battery 8 include a nickel-metal hydride battery, a lithium-ion polymer battery, and a nickel-cadmium battery.

[0014] 3 and 4 are cross-sectional views of the driving tool 1. The cross section shown in Fig. 3 is taken along line A-A in Fig. 2. The cross section shown in Fig. 4 is taken along line B-B in Fig. 1.

[0015] A cylinder 10 and a pressure accumulator vessel 11 are housed in a cylinder housing 2, and a piston 12 is housed in the cylinder 10. The piston 12 is capable of reciprocating within the cylinder 10 in the direction of the center line of the cylinder 10.

[0016] An electric motor 30 and a reduction mechanism 31 are housed in the motor housing 4. A trigger 13 is provided on the handle 3, and a push lever 14 is provided adjacent to the ejection unit 6. Furthermore, a control unit (control board) 15 is housed in the connection unit 7.

[0017] When a predetermined operation is performed with predetermined conditions satisfied, the control unit 15 supplies power from the battery 8 to the electric motor 30 to operate the electric motor 30. For example, when the trigger 13 is operated with the push lever 14 pressed against a mating member, power is supplied to the electric motor 30, and the electric motor 30 is operated. The output (driving force) of the electric motor 30 is transmitted to the driver blade 20 fixed to the piston 12 via the reduction mechanism 31 and the power transmission mechanism 32.

[0018] The magazine 5 is disposed below the motor housing 4. One longitudinal end of the magazine 5 is connected to the injection unit 6, and the other longitudinal end of the magazine 5 is connected to the motor housing 4.

[0019] The magazine 5 stores a plurality of fasteners arranged in a line and supplies the stored fasteners to the ejection unit 6. More specifically, the magazine 5 includes a feeder 5a (FIG. 1) that supplies the stored fasteners to the ejection unit 6 one by one.

[0020] The ejection unit 6 is disposed below the cylinder housing 2 and in front of the magazine 5. The ejection unit 6 temporarily stores the fasteners supplied from the magazine 5. From another perspective, the fasteners are sequentially fed from the magazine 5 to the ejection unit 6.

[0021] The driver blade 20 strikes the fastener housed in the ejection unit 6 and drives it into the mating material by reciprocating in a predetermined direction. From another perspective, the driver blade 20 strikes the fastener from the ejection unit 6 by reciprocating in a predetermined direction. In other words, the driver blade 20 is an example of the striking unit of the present invention. After a fastener is struck out of the ejection unit 6 by the driver blade 20, the feeder 5a provided in the magazine 5 feeds the next fastener into the ejection unit 6.

[0022] <Cylinder and Pressure Accumulator> The cylinder 10 and the pressure accumulator 11 are in communication with each other and form a pressure chamber 16. The pressure chamber 16 is filled with a compressed fluid. The type of fluid filled in the pressure chamber 16 is not particularly limited, but the fluid in this embodiment is air. Other examples of fluids that can be filled in the pressure chamber 16 include inert gases such as nitrogen gas and rare gases.

[0023] The air filled in the pressure chamber 16 is one of the driving sources that moves the piston 12 and the driver blade 20 in a predetermined direction. The driving of the piston 12 and the driver blade 20 by the air filled in the pressure chamber 16 will be described later.

[0024] <Piston and Driver Blade> As described above, the piston 12 is capable of reciprocating in the center line direction of the cylinder 10. From another perspective, the piston 12 is capable of reciprocating in a first direction D1 away from the pressure accumulator vessel 11 and a second direction D2 toward the pressure accumulator vessel 11.

[0025] The driver blade 20 is integral with the piston 12 and reciprocates together with the piston 12. That is, the driver blade 20 reciprocates in a first direction D1 away from the pressure accumulator vessel 11 and a second direction D2 toward the pressure accumulator vessel 11. The driver blade 20 strikes the stopper housed in the injection portion 6 by moving in the first direction D1.

[0026] In the following description, the movement direction of the piston 12 and the driver blade 20 is the up-down direction. Therefore, in the following description, the movement of the piston 12 and the driver blade 20 in the first direction D1 may be referred to as "downward." Furthermore, the movement of the piston 12 and the driver blade 20 in the second direction D2 may be referred to as "upward."

[0027] <Trigger and Push Lever> The push lever 14 is constantly biased downward (in the first direction D1) by an elastic member (for example, a coil spring). When the tip of the push lever 14 is pressed against an opposing object, the push lever 14 rises against the bias of the elastic member. When the push lever 14 rises to a predetermined position, the push lever switch is activated and a signal (push lever signal) is input to the control unit 15.

[0028] Furthermore, when the trigger 13 is operated, a trigger switch is activated and a signal (trigger signal) is input to the control unit 15. The input of the push lever signal and the trigger signal is one of the predetermined conditions for the control unit 15 to supply power to the electric motor 30. When a trigger signal is input while a push lever signal is being input, the control unit 15 supplies power to the electric motor 30.

[0029] <Details of the Driver Blade> Fig. 5A is a front perspective view of the driver blade 20, and Fig. 5B is a rear perspective view of the driver blade 20. The driver blade 20 is a rod-shaped metal member having a main body portion 21, a plurality of rack portions 22, and a fixing portion 23.

[0030] The main body 21 has an elongated shape extending in the direction of the center line of the cylinder 10. The fixing part 23 is provided at one longitudinal end (upper end) of the main body 21, and is fixed to the piston 12. More specifically, the fixing part 23 has a through hole 23a formed therein, through which a fixing pin is inserted, and both ends of the fixing pin inserted into the through hole 23a are supported by the piston 12.

[0031] The rack portion 22 is provided on one side of the driver blade 20. More specifically, six rack portions 22 are provided on one side of the main body portion 21, protruding in the same direction relative to the main body portion 21. These rack portions 22 are lined up in a row along the longitudinal direction of the main body portion 21.

[0032] In the following description, the rack section 22 closest to the fixed section 23 in the longitudinal direction of the main body section 21 may be referred to as the "upper rack section 22a," and the rack section 22 farthest from the fixed section 23 may be referred to as the "lower rack section 22b," to distinguish them from the other rack sections 22. In short, four rack sections 22 are arranged at equal intervals between the upper rack section 22a and the lower rack section 22b.

[0033] A guide protrusion 24 is formed on the front surface of the driver blade 20. More specifically, the guide protrusion 24 is formed on the front surface of the main body 21. The guide protrusion 24 is provided at the center or approximately the center in the width direction of the main body 21, and extends in the longitudinal direction of the main body 21.

[0034] A recess 25 is formed on the back surface of the driver blade 20. More specifically, the recess 25 is provided between the main body 21 and the rack 22, and extends in the arrangement direction of the rack 22 (i.e., the longitudinal direction of the main body 21). The recess 25 extends from the lower rack 22b to the upper rack 22a, and both ends in the longitudinal direction are open.

[0035] From another perspective, recess 25 is a groove provided on the back surface of driver blade 20. In this embodiment, recess 25 is formed by cutting the back surface of driver blade 20, but recess 25 can also be formed by a method other than cutting (for example, pressing).

[0036] <Electric Motor, Reduction Mechanism> Referring again to Figures 3 and 4, the electric motor 30 is a DC brushless motor composed of a stator, a rotor, a coil, etc. The reduction mechanism 31 is a planetary gear type multi-stage reduction mechanism to which the rotational driving force output from the electric motor 30 is input. The reduction mechanism 31 reduces the speed of the input rotational driving force and increases the torque before outputting it.

[0037] <Power Transmission Mechanism> The power transmission mechanism 32 is composed of a wheel 33 to which the output of the reduction mechanism 31 is input, a plurality of pins 34 provided on the wheel 33, and the like. Eight pins 34 are provided on the wheel 33 along the rotation direction of the wheel 33. From another perspective, the eight pins 34 are arranged on the circumference of a circle centered on the center of rotation of the wheel 33.

[0038] Of the eight pins 34, the pin 34b at one end in the arrangement direction is thicker than the other pins 34. In the following description, the pin 34b will be referred to as the "terminal pin 34b," and the pin 34 farthest from the terminal pin 34b in the arrangement direction will be referred to as the "starting pin 34a" to distinguish it from the other pins 34. In short, six pins 34 are arranged at equal intervals between the starting pin 34a and the terminal pin 34b.

[0039] The wheel 33 rotates counterclockwise in FIG. 4 . As the wheel 33 rotates, the pins 34 sequentially engage with the rack portions 22 provided on the driver blade 20. Specifically, the start pin 34 a first engages with the upper rack portion 22 a. Then, the pins 34 sequentially engage with the rack portions 22. As a result, the rotational force of the wheel 33 is transmitted to the driver blade 20, and the driver blade 20 and the piston 12 move in the second direction D2. In other words, the piston 12 and the driver blade 20 rise.

[0040] When the piston 12 and the driver blade 20 rise, the air filling the pressure chamber 16 is compressed, and the internal pressure of the pressure chamber 16 rises. In other words, the air spring is compressed. After that, when the engagement between the end pin 34b and the lower end rack portion 22b is released, the rotational force of the wheel 33 is no longer transmitted to the driver blade 20. As a result, the piston 12 and the driver blade 20 move in the first direction D1 due to the pressure of the air in the pressure chamber 16. In other words, the piston 12 and the driver blade 20 descend.

[0041] <Top Dead Center and Bottom Dead Center> Driver blade 20 reciprocates in first direction D1 and second direction D2 together with piston 12 between bottom dead center, which is the end of the stroke on the first direction D1 side, and top dead center, which is the end of the stroke on the second direction D2 side. In this embodiment, the stroke of driver blade 20 is 62 mm.

[0042] The piston 12 moving in the first direction D1 collides with the bumper 17 disposed at the lower end of the cylinder 10 and stops. In other words, the position of the piston 12 when it abuts against the bumper 17 (the position shown in FIG. 4 ) is the bottom dead center of the piston 12. The driver blade 20, which moves integrally with the piston 12, also reaches the bottom dead center when the piston 12 reaches the bottom dead center. In other words, the position of the driver blade 20 when the piston 12 abuts against the bumper 17 (the position shown in FIG. 4 ) is the bottom dead center of the driver blade 20. In other words, the position of the driver blade 20 when the piston 12 is at the bottom dead center is the bottom dead center of the driver blade 20.

[0043] On the other hand, the piston 12 moving in the second direction D2 begins to descend toward bottom dead center when the engagement between the end pin 34b and the lower end rack portion 22b is released. In other words, the position of the piston 12 at the moment the engagement between the end pin 34b and the lower end rack portion 22b is released is the top dead center of the piston 12. The driver blade 20 moving integrally with the piston 12 also begins to descend toward bottom dead center at the same time that the piston 12 begins to descend toward bottom dead center. In other words, the position of the driver blade 20 at the moment the engagement between the end pin 34b and the lower end rack portion 22b is released is the top dead center of the driver blade 20. In other words, the position of the driver blade 20 when the piston 12 is at top dead center is the top dead center of the driver blade 20.

[0044] <Injection Unit> Figure 6 is an enlarged perspective view of the injection unit 6. The injection unit 6 includes a blade guide 50 and a guide plate 60 rotatably connected to the blade guide 50. The injection unit 6 is also sometimes called a "nose unit."

[0045] The blade guide 50 and the guide plate 60 cooperate to form an injection path 6a through which the fastener 40 is supplied. In this embodiment, the blade guide 50 forms one side of the injection path 6a, and the guide plate 60 forms the other side of the injection path 6a.

[0046] More specifically, when the guide plate 60 is rotated and placed on top of the blade guide 50, an injection path 6a is formed between them. From another perspective, when the blade guide 50 and the guide plate 60 are placed opposite each other, a space that serves as the injection path 6a is formed between them. In other words, in this embodiment, the blade guide 50 corresponds to the first wall portion, and the guide plate 60 corresponds to the second wall portion.

[0047] The fastener 40 of this embodiment has a first leg 41, a second leg 42, and a head 43, and has a generally U-shaped appearance overall. The first leg 41 and the second leg 42 form a pair and are parallel to each other. The head 43 connects one end of the first leg 41 to one end of the second leg 42. The fastener 40 is also sometimes called a "staple."

[0048] The blade guide 50 is provided with a pair of locking claws 51, and the guide plate 60 is provided with an annular locking hook 61. After the guide plate 60 is placed on the blade guide 50, the locking hooks 61 hooked onto the locking claws 51 are pulled up, whereby the blade guide 50 and the guide plate 60 are fixed to each other.

[0049] The locking hook 61 is pulled up when the operating part 62 connected to the upper part of the locking hook 61 is rotated upward. On the other hand, when the operating part 62 is rotated downward, the locking hook 61 is pushed down, and the locking hook 61 is disengaged from the locking claw 51.

[0050] <Blade Guide> Figure 7A is an enlarged perspective view of the blade guide 50. A connecting portion 52 is integrally molded at the top of the blade guide 50. The connecting portion 52 includes a pair of opposing side wall portions 53 and flange portions 54 extending outward from the lower ends of each side wall portion 53.

[0051] A connecting hole 53a is formed in each side wall portion 53, and a bolt hole 54a is formed in each flange portion 54. The blade guide 50 is fixed to the holder 18 (FIG. 4) by a bolt inserted into the bolt hole 54a in the flange portion 54.

[0052] The blade guide 50 is further provided with a substantially rectangular opening 55 that communicates with the magazine 5. The opening 55 is provided between the pair of locking claws 51 and has a shape and size that allows a portion of the feeder 5a (FIG. 1) to enter and exit. The stopper 40 is fed into the ejection section 6 through the opening 55 and is housed therein.

[0053] A protrusion 56 protruding toward the guide plate 60 is provided on one side of the opening 55. From another perspective, the protrusion 56 is a rib protruding toward the guide plate 60.

[0054] The protrusion 56 extends along the edge of the opening 55. More specifically, one end (upper end) of the protrusion 56 extends beyond the opening 55 toward the connecting portion 52. The other end (lower end) of the protrusion 56 extends to the center or approximately the center of the opening 55 in the longitudinal direction.

[0055] 6 , the protrusion 56 provided on the edge of the opening 55 is located to the side of the fastener 40 when the fastener 40 is supplied to the injection path 6a through the opening 55. More specifically, the protrusion 56 is located to the side of the first leg 41 of the fastener 40 supplied to the injection path 6a, and extends parallel or approximately parallel to the first leg 41.

[0056] <Guide Plate> Figure 7B is an enlarged perspective view of guide plate 60. Guide plate 60 is provided with guide grooves 63 into which guide protrusions 24 (Figure 5A) provided on driver blade 20 can be fitted. Guide grooves 63 restrict movement of guide protrusions 24 in a direction intersecting the longitudinal direction and guide driver blade 20 as it moves up and down.

[0057] A through hole 64 is provided in the upper part of the guide plate 60. When the upper part of the guide plate 60 is inserted between the two side wall portions 53 of the blade guide 50, the through hole 64 communicates with each of the connecting holes 53a. The guide plate 60 is rotatably connected to the blade guide 50 by a connecting pin that passes through the connecting hole 53a and the through hole 64.

[0058] <Function of the Concave and Convex Portions> Fig. 8 is a partial cross-sectional view showing the injection section 6 when the driver blade 20 is in the standby position. Fig. 9 is a partial cross-sectional view showing the injection section 6 when the driver blade 20 is at the top dead center. Fig. 10 is a partial cross-sectional view showing the injection section 6 when the driver blade 20 is at the bottom dead center.

[0059] 11 is a partially enlarged cross-sectional view taken along line CC in FIG. 9, and FIG. 12 is a partially enlarged cross-sectional view taken along line DD in FIG.

[0060] The standby position is a position between the top dead center and the bottom dead center. After the driving operation is completed, the control unit 15 (FIG. 3) raises the driver blade 20 from the bottom dead center to the standby position and then stops the electric motor 30.

[0061] 8, when the driver blade 20 is in the standby position, the tip of the driver blade 20 is positioned below the head 43 of the fastener 40. From another perspective, the driver blade 20 in the standby position partially closes the entrance to the injection passage 6a. As a result, the supply of the fastener 40 to the injection passage 6a is restricted.

[0062] 9, when the driver blade 20 moves from the standby position toward the top dead center and the tip of the driver blade 20 moves above the head 43 of the fastener 40, the restriction on the supply of the fastener 40 is released. Thereafter, the feeder 5a supplies the fastener 40 to the injection path 6a.

[0063] As described above, when the fastener 40 is supplied to the injection path 6a, the protrusion 56 provided on the blade guide 50 is positioned to the side of the fastener 40. More specifically, as shown in FIG. 11 , the protrusion 56 is positioned to the side of the first leg 41 of the fastener 40.

[0064] The driver blade 20 then moves from the top dead center toward the bottom dead center, striking the fastener 40 in the injection path 6a. At this time, the convex portion 56 is present on the side of the fastener 40. As a result, tilting or deformation of the fastener 40 toward the convex portion 56 due to the impact of the strike is restricted. In other words, the convex portion 56 prevents all or part of the fastener 40 from protruding outside the injection path 6a, improving driving accuracy.

[0065] The inclination or deformation of the stopper 40 toward the opposite side to the protrusion 56 is restricted by the inner surface 55 a of the opening 55 located to the side of the second leg 42 .

[0066] 10 and 12 , as the driver blade 20 descends as described above, the protrusion 56 on the blade guide 50 fits into the recess 25 on the driver blade 20. In other words, the recess 25 on the driver blade 20 receives the protrusion 56 on the blade guide 50 as the driver blade 20 descends. From another perspective, the driver blade 20 passes over the protrusion 56 without interfering with it. Therefore, the movement of the driver blade 20 is not hindered by the protrusion 56 on the blade guide 50. In other words, the recess 25 prevents interference between the driver blade 20 and the blade guide 50 (protrusion 56).

[0067] Here, convex portion 56 does not enter concave portion 25 when driver blade 20 is at the top dead center (see FIG. 8 ), but enters concave portion 25 as driver blade 20 moves from the top dead center to the bottom dead center. More specifically, convex portion 56 enters concave portion 25 after driver blade 20 has passed the standby position.

[0068] Furthermore, when the driver blade 20 is at the bottom dead center, the protrusion 56 is inserted into the recess 25 up to the middle in the longitudinal direction of the recess 25. More specifically, when the driver blade 20 is at the bottom dead center, the upper end of the protrusion 56 does not reach the upper end of the recess 25, but is located between the second and third rack portions 22 from the bottom (see FIG. 10 ).

[0069] From another perspective, the overall length L1 of the recess 25 shown in FIG. 5B is a length such that the upper end of the protrusion 56 does not reach the upper end of the recess 25 even when the driver blade 20 reaches the bottom dead center. From yet another perspective, the overall length L2 of the protrusion 56 shown in FIG. 8 is a length such that the upper end of the protrusion 56 does not reach the upper end of the recess 25 even when the driver blade 20 reaches the bottom dead center. Specifically, in this embodiment, the overall length L1 of the recess 25 is 58.0 mm, and the overall length L2 of the protrusion 56 is 25.5 mm. However, the length of the protrusion 56 can be shorter than 25.5 mm as long as it is positioned to the side of the arrangement range of the stop 40 shown in FIG. 8, and L2 should be 0.4 mm or greater. Furthermore, the overall length L1 of the recess 25 can be changed as appropriate as long as it prevents interference between the protrusion 56 and the driver blade 20.

[0070] 12 can be changed as appropriate as long as it is possible to prevent interference between the protrusion 56 and the driver blade 20. Furthermore, increasing the height H of the protrusion 56 improves the positioning effect relative to the fastener 40.

[0071] However, if the height H of the protrusion 56 is increased, the depth of the recess 25 must be increased accordingly, but if the depth of the recess 25 is too deep, there is a risk of a decrease in the strength and durability of the driver blade 20. Taking these circumstances into consideration, it is preferable that the height H of the protrusion 56 be within a range of 5% to 80% of the thickness T of the driver blade 20.

[0072] In this embodiment, the height H of the protrusion 56 is 0.4 mm, and the thickness T of the driver blade 20 is 2.5 mm. In other words, the height H of the protrusion 56 is 16% of the thickness T of the driver blade 20.

[0073] Other Embodiments The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, in the above-described embodiment, the protrusion 56 is provided on the blade guide 50. Furthermore, the recess 25 that receives the protrusion 56 is provided on the back surface of the driver blade 20 that faces the blade guide 50.

[0074] However, as shown in Fig. 13, there is also an embodiment in which a protrusion 56 is provided on the guide plate 60 and a recess 25 is provided on the front surface of the driver blade 20. Also, as shown in Fig. 14, there is also an embodiment in which a protrusion 56 is provided on both the blade guide 50 and the guide plate 60 and a recess 25 is provided on both surfaces of the driver blade 20. From these embodiments, it can be understood that the protrusion 56 may be provided on only one of the first wall portion and the second wall portion, or may be provided on both.

[0075] DESCRIPTION OF SYMBOLS 1...driving tool, 2...cylinder housing, 3...handle, 4...motor housing, 5...magazine, 5a...feeder, 6...injection portion, 6a...injection path, 7...connection portion, 8...battery, 10...cylinder, 11...pressure accumulator container, 12...piston, 13...trigger, 14...push lever, 15...control portion (control board), 16...pressure chamber, 17...bumper, 18...holder, 20...driver blade, 21...main body portion, 22...rack portion, 22a...upper end rack portion, 22b...lower end rack portion, 23...fixing portion, 23a...through hole, 24...guide projection , 25...recess, 30...electric motor, 31...reduction mechanism, 32...power transmission mechanism, 33...wheel, 34...pin, 34a...starting pin, 34b...terminal pin, 40...stopper, 41...first foot portion, 42...second foot portion, 43...head portion, 50...blade guide, 51...locking claw, 52...connecting portion, 53...side wall portion, 53a...connecting hole, 54...flange portion, 54a...bolt hole, 55...opening, 55a...inner surface, 56...convex portion, 60...guide plate, 61...locking hook, 62...operating portion, 63...guide groove, 64...through hole, D1...first direction, D2...second direction

Claims

1. An ejection section that houses a fastener; a striking portion that is reciprocable in a first direction and a second direction opposite to the first direction and strikes the stopper housed in the ejection portion by moving in the first direction; the injection section includes a first wall section that forms one side of the injection path through which the stopper is supplied, a second wall section that faces the first wall section and forms the other side of the injection path, and a convex section provided on at least one of the first wall section and the second wall section, The striking portion has a recess for receiving the protrusion, the protrusion is located to the side of the fastener supplied to the injection path and prevents all or a part of the fastener from coming out of the injection path; A work machine, wherein an end portion of the convex portion on the second direction side is located on the second direction side relative to an end portion of the stopper on the second direction side.

2. The striking portion has an elongated main body portion and a plurality of rack portions provided on one side of the main body portion, The rack portions are aligned in a row along the longitudinal direction of the main body portion, The work machine according to claim 1 , wherein the recess is provided between the main body and the rack portion and extends along an arrangement direction of the plurality of rack portions.

3. The work machine according to claim 1 , wherein the height of the convex portion is 5% to 80% of the thickness of the striking portion.

4. The fastener has a first foot portion and a second foot portion parallel to each other, and a head portion connecting one end of the first foot portion and one end of the second foot portion, The work machine according to claim 1 , wherein the protrusion is located to a side of the first leg of the fastener supplied to the injection path.

5. The impact portion reciprocates between a bottom dead center, which is an end of a movement stroke in a first direction, and a top dead center, which is an end of a movement stroke in the second direction, The work machine according to claim 1 , wherein when the impact portion is located at the top dead center, the end portion of the impact portion on the first direction side is located closer to the first direction than the end portion of the convex portion on the second direction side.

6. When the impact part is at the bottom dead center, the convex part enters the concave part, The work machine according to claim 5 , wherein the protrusion does not enter the recess when the striking portion is at the top dead center.

7. A work machine as described in Claim 6, wherein when the striking portion is at the bottom dead center, the convex portion penetrates into the recess halfway in the longitudinal direction of the recess.

8. The striking section has the rack section provided on only one side of the main body section, the ejection portion is adjacent to a side of the main body portion on which the rack portion is not provided, and has an inner surface that prevents all or a part of the stopper from coming out of the ejection path; The work machine according to claim 2 , wherein the height of the inner surface is greater than the height of the protruding portion.

9. Further comprising a magazine that supplies the stopper to the ejection section, The first wall portion has an opening communicating with the magazine, The work machine according to claim 1 , wherein the protrusion is provided on the first wall portion.

10. An ejection section that houses a stopper; a striking portion that is reciprocally movable in a first direction and a second direction opposite to the first direction and strikes the stopper housed in the ejection portion by moving in the first direction; a magazine that supplies the stopper to the ejection section, the ejection section includes a first wall section having an opening section communicating with the magazine and forming one side of an ejection passage through which the stopper is supplied, a second wall section facing the first wall section and forming the other side of the ejection passage, and a protrusion section provided on the first wall section; The striking portion has a recess for receiving the protrusion, The convex portion is located to the side of the fastener supplied to the injection path, and prevents all or a part of the fastener from coming out of the injection path.

11. An ejection section that houses a stopper; a striking portion that is reciprocable in a first direction and a second direction opposite to the first direction and strikes the stopper housed in the ejection portion by moving in the first direction; the injection section includes a first wall section that forms one side of the injection path through which the stopper is supplied, a second wall section that faces the first wall section and forms the other side of the injection path, and a convex section provided on at least one of the first wall section and the second wall section, The striking portion has a recess for receiving the protrusion, the protrusion is located to the side of the fastener supplied to the injection path and prevents all or a part of the fastener from coming out of the injection path; The striking portion has an elongated main body portion and a plurality of rack portions provided on only one side of the main body portion, the ejection portion is adjacent to a side of the main body portion on which the rack portion is not provided, and has an inner surface that prevents all or a part of the stopper from coming out of the ejection path; A work machine, wherein the height of the inner surface is greater than the height of the convex portion.