Work machine

Abstract

The present invention improves the convenience of a work machine. A nailing machine 1A comprises: a driver blade that strikes a nail supported by a blade guide; a slider 60 that can move between a first position and a second position; a magnet 80 and a magnet holder 81; a guide part that is combined with the slider 60; and a magnetic sensor that detects a position of the slider 60. When the slider 60 and the guide part are combined, separation of the magnet 80 and the magnet holder 81 from the slider 60 is regulated. When the combination of the slider 60 and the guide part is released, separation of the magnet 80 and the magnet holder 81 from the slider 60 is permitted.

Description

Work equipment

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

[0002] Many work machines have one or more movable parts that move between two or more different positions. In such work machines, various controls can be performed depending on the position of the movable part.

[0003] Patent document 1 discloses a driving machine that includes a movable body that can move relative to a main body, a signal generating unit that generates a signal depending on the state of the movable body, and a control unit that performs predetermined control based on the signal generated by the signal generating unit.

[0004] JP 2018-103291 A

[0005] In a work machine that performs some control depending on the position of a movable part, the convenience of the work machine can be further improved by reliably detecting the position of the movable part with a simple configuration.

[0006] A working machine according to one embodiment includes an ejection unit that supports a fastener, an impact unit that impacts the fastener supported by the ejection unit, a movable unit that is movable between a first position and a second position, an assembly member that engages with the movable unit, and a detection unit that detects the position of the movable unit. The movable unit includes a detectable portion that is detected by the detection unit, and a holding unit that engages with the assembly member and holds the detectable portion. When the holding unit and the assembly member are engaged, the detectable portion is prevented from separating from the holding unit, and when the engagement between the holding unit and the assembly member is released, the detectable portion is allowed to separate from the holding unit.

[0007] According to the present invention, the convenience of the work machine can be improved.

[0008] 1 is a front view showing the appearance of the nail gun. FIG. 2 is a side view showing the appearance of the nail gun. FIG. 3 is a cross-sectional view showing the structure of the nail gun. FIG. 4 is a cross-sectional view showing the structure of the nail gun. FIG. 5 is a perspective view showing the nose portion and its periphery. FIG. 6 is a perspective view showing a slider. FIG. 7 is a perspective view showing the slider attached to the nose portion. FIG. 8 is a partially enlarged cross-sectional view showing the slider attached to the nose portion. FIG. 9 is a partially enlarged cross-sectional view showing the slider attached to the nose portion. FIG. 10 is a perspective view showing a magnet and a magnet holder. FIG. 11 is a perspective view showing a procedure for attaching the magnet holder to the slider. FIG. 12 is a partially enlarged cross-sectional view showing movement (position change) of the slider, magnet holder, and magnet. FIG. 13 is a perspective view showing a blade detector. FIG. 14 is a perspective view showing a procedure for attaching the magnet holder to the blade detector. FIG. 15 is a perspective view showing the blade detector and torsion spring combined. FIG. 16 is a perspective view showing the blade detector and torsion spring combined. FIG. 17 is a partially enlarged cross-sectional view showing the blade detector attached to the nose portion. 22 is a partially enlarged cross-sectional view showing the movement (position change) of the blade detector, magnet holder, and magnet. FIG. 23 is a plan view showing a modified example of the slider and magnet holder. FIG. 24 is a plan view showing the state in which the magnet is held by the slider and magnet holder shown in FIG. 21. FIG. 25 is a side view showing the state in which the magnet is held by the slider and magnet holder shown in FIG. 21. FIG. 26 is a plan view showing a modified example of the upper push lever. FIG. 27 is an enlarged view showing the attachment state of the nose portion of the upper push lever shown in FIG. 23.

[0009] An example of an embodiment of the present invention will be described in detail below with reference to the drawings. In all drawings used to explain the embodiment, the same reference numerals are used for the same or substantially the same configurations and elements. Furthermore, as a general rule, once a configuration or element has been explained, it will not be explained again.

[0010] <Outline of Working Machine> The working machine according to this embodiment is suitable for driving fasteners such as nails and staples into mating materials such as wood, gypsum board, etc. More specifically, the working machine according to this embodiment is a nailing machine that drives nails into mating materials.

[0011] Fig. 1 is a front view showing the appearance of a nail driver 1A according to this embodiment. Fig. 2 is a side view showing the appearance of the nail driver 1A. Fig. 3 and Fig. 4 are cross-sectional views showing the structure of the nail driver 1A.

[0012] The cross section shown in FIG. 3 is taken along line AA in FIG. 1, and the cross section shown in FIG. 4 is taken along line BB in FIG.

[0013] The nail gun 1A has a nail gun main body 1 and a magazine 2. A plurality of nails is loaded into the magazine 2. The magazine 2 is equipped with a feeder 2a that supplies the plurality of loaded nails one by one to the nail gun main body 1. The nail gun main body 1 strikes the nails supplied from the magazine 2. As a result, the nails are ejected from the nail gun main body 1 and driven into the target material W.

[0014] <Housing> The nail driver main body 1 has a housing 10 including a main body portion 11, a handle portion 12, a motor accommodating portion 13, a connecting portion 14, and the like.

[0015] One longitudinal end of the handle portion 12 and the motor housing portion 13 is connected to the main body portion 11, and the other longitudinal end of the handle portion 12 and the motor housing portion 13 is connected to the connecting portion 14. In other words, the main body portion 11, the handle portion 12, the motor housing portion 13, and the connecting portion 14 are integrated.

[0016] The main body 11 has a generally rectangular cylindrical shape as a whole. Here, the longitudinal direction of the main body 11 shown in Figures 1 to 4 is defined as the "up-down direction," and the longitudinal direction of the handle 12 and the motor housing 13 is defined as the "front-rear direction." A third direction perpendicular to the up-down direction and the front-rear direction is defined as the "left-right direction." The right and left sides are distinguished based on the viewpoint of the operator when using the nail driver 1A.

[0017] To explain the housing 10 again in accordance with the above definition, the handle portion 12 is located above the motor housing portion 13 and extends rearward from the back surface of the main body portion 11. On the other hand, the motor housing portion 13 is located below the handle portion 12 and extends rearward from the back surface of the main body portion 11.

[0018] Furthermore, the magazine 2 is located to the left of the handle portion 12 and the motor housing portion 13 in normal use. In other words, the handle portion 12 and the motor housing portion 13 are located to the right of the magazine 2 in normal use. In the following description, the side on which the magazine 2 is located in each drawing may be referred to as the "magazine side" regardless of whether the magazine 2 is shown in the drawing. Similarly, the side on which the handle portion 12 is located in each drawing may be referred to as the "handle side" regardless of whether the handle portion 12 is shown in the drawing.

[0019] A battery attachment section to which the battery pack 3 can be attached and detached is provided on the rear surface of the connecting section 14. The connecting section 14 also houses a controller 4 as a control section.

[0020] The housing 10 is composed of two housing members made of synthetic resin such as nylon or polycarbonate. More specifically, the two housing members are butted together and fixed to form the housing 10, which has a main body portion 11, a handle portion 12, a motor accommodating portion 13, and a connecting portion 14.

[0021] At least a portion of the surface of the housing 10 is covered with a resin cover. More specifically, at least a portion of the surface of the housing 10 is covered with a resin layer (elastomer layer) formed (laminated) on the housing 10 by two-layer molding (two-color molding).

[0022] <Striking Mechanism> The nail driver body 1 has a striking mechanism for striking nails. The striking mechanism is composed of a cylinder 21, a pressure accumulator vessel 22, a piston 23, a driver blade 24, etc.

[0023] The cylinder 21 and the pressure accumulator vessel 22 are housed in the main body 11. The cylinder 21 has a cylindrical shape that extends in the vertical direction, and the pressure accumulator vessel 22 is disposed above the cylinder 21. The cylinder 21 and the pressure accumulator vessel 22 are in communication with each other and form a pressure chamber 25.

[0024] The pressure chamber 25 is filled with gas. More specifically, the pressure chamber 25 is filled with compressed air. The piston 23 is housed in the cylinder 21 so as to be able to move up and down. Therefore, the volume of the pressure chamber 25 increases and decreases as the piston 23 moves. Specifically, the volume of the pressure chamber 25 is minimum when the piston 23 moves to top dead center, and is maximum when the piston 23 moves to bottom dead center.

[0025] The piston 23 shown in FIG. 3 is at its top dead center, and the piston 23 shown in FIG. 4 is at its bottom dead center.

[0026] The driver blade 24 is a long, thin metal member that extends in the vertical direction. The upper end of the driver blade 24 is connected to the piston 23. From another perspective, the driver blade 24 extends downward from the piston 23.

[0027] The driver blade 24 moves up and down integrally with the piston 23. When the piston 23 moves from the top dead center (FIG. 3) toward the bottom dead center (FIG. 4), the driver blade 24, which moves integrally with the piston 23, strikes the nail and ejects it from the nail driver body 1. In other words, the piston 23 and the driver blade 24 form a striking part that strikes the fastener.

[0028] <Drive Mechanism> The nail driver body 1 has a drive mechanism that drives the impact mechanism. The drive mechanism is composed of a motor 31 and a speed reduction mechanism 32 shown in Fig. 19, a pinwheel 33 shown in Fig. 4, etc.

[0029] The motor 31 is a brushless motor and is housed in the motor housing portion 13. The motor 31 has a drive shaft that extends in the front-rear direction, and the drive shaft is connected to an input element of the reduction mechanism portion 32.

[0030] The motor 31 is operated by power supplied from the battery pack 3 under the control of the controller 4 shown in Fig. 3. When a predetermined condition is satisfied, the controller 4 supplies power from the battery pack 3 to the motor 31 to operate the motor 31. When the predetermined condition is no longer satisfied, or when another predetermined condition is satisfied, the controller 4 cuts off the power supply from the battery pack 3 to the motor 31 to stop the motor 31.

[0031] 19 is connected to the pinwheel 33. More specifically, the output element of the speed reduction mechanism 32 is connected to the rotation shaft of the pinwheel 33. As a result, when the motor 31 is operated, the pinwheel 33 rotates.

[0032] As shown in FIG. 4, the pinwheel 33 is provided with a plurality of pinion pins 33 a that engage with a plurality of racks 24 a provided on the driver blade 24 .

[0033] The racks 24a are arranged at predetermined intervals along the longitudinal direction (vertical direction) of the driver blade 24. On the other hand, the pinion pins 33a are arranged at predetermined intervals along the circumferential direction (rotational direction) of the pinwheel 33.

[0034] As the pinwheel 33 rotates, the pinion pin 33a and the rack 24a sequentially engage with each other, moving the driver blade 24 upward. As a result, the piston 23 moves from the bottom dead center toward the top dead center. In other words, the piston 23 and the driver blade 24 rise. This reduces the volume of the pressure chamber 25, and the internal pressure of the pressure chamber 25 increases. In other words, the compressed air filled in the pressure chamber 25 is further compressed.

[0035] Thereafter, when the engagement between the pinion pin 33a and the rack 24a is released, the piston 23 is moved from the top dead center side toward the bottom dead center side by the pressure of the compressed air in the pressure chamber 25. As a result, the driver blade 24 is moved downward. In other words, the piston 23 and the driver blade 24 descend.

[0036] <Nose Portion> The nail driver body 1 has a nose portion 40 into which nails loaded in the magazine 2 are fed. Fig. 5 is a perspective view showing the nose portion 40 and its surroundings.

[0037] The nose portion 40 includes a cylindrical portion 41 and a nose body 42 extending downward from the cylindrical portion 41 .

[0038] The lower end of the cylinder 21 is inserted into the cylindrical portion 41 and is screwed to the cylindrical portion 41. A bumper 43 is housed in the cylindrical portion 41 (FIGS. 3 and 4). The bumper 43 receives the piston 23 as it descends and absorbs the kinetic energy of the piston 23 by elastic deformation.

[0039] The nose body 42 protrudes downward from the main body 11 of the housing 10. The nose body 42 is provided with a wheel accommodating portion 44 that accommodates the pinwheel 33. In addition, a blade guide 45 is attached to the nose body 42.

[0040] The blade guide 45 is composed of a front guide member 46 that forms the front portion and a rear guide member 47 that forms the rear portion, and forms an injection path that communicates with the inside of the cylinder 21 via a through hole provided in the bottom surface of the cylindrical portion 41.

[0041] The rear guide member 47 has a substantially rectangular supply port. Nails fed from the magazine 2 are fed into the ejection path through the supply port and supported by the blade guide 45. In other words, the blade guide 45 is an ejection section that supports the fasteners.

[0042] <Push Lever Unit> The nail driver body 1 has a push lever unit 50 including a push lever 51. The push lever unit 50 is disposed in front of the nose portion 40 and is movable in the up and down direction relative to the nose portion 40.

[0043] <Adjuster> The push lever unit 50 includes an adjuster 54 in addition to the push lever 51. The adjuster 54 has a cylindrical shape, and its outer circumferential surface is knurled.

[0044] The adjuster 54 has a connecting shaft 54a that protrudes upward from the top surface. As shown in Fig. 3, the connecting shaft 54a passes through the coil spring 5 interposed between the nose portion 40 and the push lever unit 50, and is inserted into the support cylinder 48 provided on the nose portion 40. Note that the coil spring 5 is not shown in Fig. 5.

[0045] One end of the coil spring 5, through which the connecting shaft 54a is inserted, abuts against the flange portion of the support cylinder 48, and the other end abuts against the upper surface of the connecting ring 52a adjacent to the upper side of the adjuster 54. As a result, the push lever unit 50 including the adjuster 54 is constantly biased downward by the coil spring 5.

[0046] <Push Lever> Referring again to Figure 5, the push lever 51 is a long, thin metal member that extends in the vertical direction, and is composed of an upper push lever 52 and a lower push lever 53.

[0047] One end (upper end) of the upper push lever 52 is connected to the upper part of the adjuster 54 , and one end (upper end) of the lower push lever 53 is connected to the lower part of the adjuster 54 .

[0048] More specifically, a connecting ring 52 a is provided at the upper end of the upper push lever 52 , and the connecting ring 52 a is adjacent to the upper side of the adjuster 54 and is rotatable relative to the adjuster 54 .

[0049] Meanwhile, a locking portion 52b is provided at the other end (lower end) of the upper push lever 52. The locking portion 52b abuts against the locking projection 49 provided on the nose portion 40. This restricts downward movement of the push lever unit 50, which is biased by the coil spring 5.

[0050] The upper end of the lower push lever 53 is bent so as to be positioned below the bottom surface of the adjuster 54. As shown in Figure 3, an adjustment shaft 53a that protrudes upward is provided at the upper end of the lower push lever 53, and a male thread is formed on the outer circumferential surface of the adjustment shaft 53a. The adjustment shaft 53a is inserted into the adjuster 54 from the bottom surface of the adjuster 54 and is threadedly coupled to a female thread formed on the inner circumferential surface of the adjuster 54.

[0051] As described above, the push lever 51 is integrated with the adjuster 54 and is suspended from the nose portion 40 via the adjuster 54 .

[0052] As a result, when the push lever 51 abuts against the opposing material W, it moves upward relative to the nose portion 40 against the bias of the coil spring 5. On the other hand, when the push lever 51 is separated from the opposing material W, it moves downward relative to the nose portion 40 due to the bias of the coil spring 5. In other words, the push lever 51 (upper push lever 52 and lower push lever 53) is an abutment portion that moves in a predetermined direction when abutted against the opposing material W.

[0053] <Driving Depth Adjustment Mechanism> Rotating the adjuster 54 shown in Figure 3 etc. increases or decreases the protruding length of the adjustment shaft 53a relative to the adjuster 54. In other words, rotating the adjuster 54 causes the lower push lever 53 shown in Figure 5 etc. to extend or contract relative to the nose portion 40. In other words, by rotating the adjuster 54, the protruding length of the push lever 51 relative to the nose portion 40 (blade guide 45) can be changed.

[0054] When the projection length of the push lever 51 relative to the nose portion 40 is changed, the movement stroke of the push lever 51 relative to the nose portion 40 increases or decreases. Specifically, when the projection length increases, the movement stroke becomes longer, and when the projection length decreases, the movement stroke becomes shorter.

[0055] As a result, the depth at which the nail is driven into the nail is changed. In other words, the nail driver 1A is provided with an adjustment mechanism for changing the depth at which the nail is driven into the nail, and the adjuster 54 is an operating part of the adjustment mechanism.

[0056] <Slider> The nail driver 1A has a slider 60 that moves integrally with the push lever 51. FIG.

[0057] The slider 60 has an upper arm 61 and a lower arm 62 that face each other in the vertical direction. An upper support piece 63 is provided below (rear of) the upper arm 61, and a lower support piece 64 is provided below (rear of) the lower arm 62.

[0058] Furthermore, a slide piece 65 is provided on one side (handle side) of the upper arm 61 and the lower arm 62, and slide pieces 66, 67 are provided on the other side (magazine side) of the upper arm 61 and the lower arm 62. More specifically, the slide piece 66 is provided on the magazine side of the upper arm 61, and the slide piece 67 is provided on the magazine side of the lower arm 62.

[0059] From another perspective, the slide piece 66 is part of the upper support piece 63 that protrudes further toward the magazine than the upper arm 61, and the slide piece 67 is part of the lower support piece 64 that protrudes further toward the magazine than the lower arm 62.

[0060] A fitting portion 68 into which a magnet holder 81, which will be described later, fits is provided between the upper arm 61 and the lower arm 62. In this embodiment, the fitting portion 68 is a recess that opens toward one side in the left-right direction (the magazine side). Therefore, the magnet holder 81 fits into the fitting portion 68 toward the other side in the left-right direction (the handle side). How the magnet holder 81 is attached to and detached from the slider 60 will be described later.

[0061] <Slider Mounting State> Figure 7 is a perspective view showing the slider 60 mounted on the nose portion 40. Figures 8 to 10 are partially enlarged cross-sectional views showing the slider 60 mounted on the nose portion 40.

[0062] The cross section shown in Fig. 8 is taken along line A-A in Fig. 1. That is, Fig. 8 is an enlarged cross section of a portion of the cross section shown in Fig. 3. The cross section shown in Fig. 9 is taken along line C-C in Fig. 3, and the cross section shown in Fig. 10 is taken along line D-D in Fig. 3.

[0063] As shown in Fig. 8, the slider 60 is disposed between the upper push lever 52 and a board case 6a (described later), and is engaged with the upper push lever 52. As shown in Fig. 7, the slider 60 is combined with guide portions 71 and 72, which are one of the assembly members.

[0064] Although the slider 60 is engaged with the upper push lever 52, it is not fixed to the upper push lever 52. Therefore, the force applied to the lower push lever 53 is not transmitted to the slider 60 via the adjuster 54 or the upper push lever 52.

[0065] As described above, the magnet holder 81 is fitted into the fitting portion 68 of the slider 60. Therefore, preventing or suppressing the transmission of force from the push lever 51 to the slider 60 contributes to preventing or suppressing displacement of the magnet holder 81 and the magnet 80 housed in the magnet holder 81.

[0066] More specifically, even if the push lever 51 bends due to contact with the mating member W, the slider 60 does not move or tilt, and displacement of the magnet holder 81 and the magnet 80 is prevented or suppressed.

[0067] As shown in FIG. 8 , the upper arm 61 of the slider 60 is disposed above the upper push lever 52 , and the lower arm 62 of the slider 60 is disposed below the upper push lever 52 .

[0068] From another perspective, the upper arm 61 and the lower arm 62 hold the upper push lever 52 therebetween. In other words, the upper push lever 52 is disposed between the upper arm 61 and the lower arm 62 of the slider 60.

[0069] Therefore, when the push lever 51 rises, the slider 60 is pushed up by the upper push lever 52. On the other hand, when the push lever 51 falls, the slider 60 is pushed down by the upper push lever 52.

[0070] In other words, the slider 60 moves up and down integrally with the push lever 51, which is the abutment part. More specifically, the slider 60 moves integrally with the push lever 51 from a first position to a second position above the first position. Also, the slider 60 moves integrally with the push lever 51 from the second position to the first position below the second position. In short, the slider 60 moves integrally with the push lever 51 between the first position and the second position.

[0071] <Assembly Members (Guide Portions)> The movement of the slider 60 as described above is guided by assembly members (guide portions 71, 72). As shown in Fig. 7, a pair of guide portions 71, 72 extending in the up-down direction are integrally formed with the nose body 42.

[0072] As shown in FIGS. 9 and 10, the guide portions 71 and 72 are provided with side guide walls 73 and a front guide wall 74, and have a generally L-shaped cross section in the cross section shown in FIGS.

[0073] The guide portions 71 and 72 face each other in the left-right direction across the slider 60. More specifically, the side guide wall 73 of the guide portion 71 faces the side surface of the slider 60 on the handle side, and the side guide wall 73 of the guide portion 72 faces the side surface of the slider 60 on the magazine side.

[0074] Furthermore, the front guide wall 74 of the guide portion 71 faces the slide piece 65 of the slider 60 , and the front guide wall 74 of the guide portion 72 faces the slide pieces 66 and 67 of the slider 60 .

[0075] From another perspective, the slide piece 65 of the slider 60 is slidably inserted between the front guide wall 74 of the guide portion 71 and the substrate case 6a, and the slide pieces 66 and 67 of the slider 60 are slidably inserted between the front guide wall 74 of the guide portion 72 and the substrate case 6a.

[0076] As a result, the slider 60 is guided by the guide portions 71 and 72 and moves between the first position and the second position.

[0077] The locking projections 49 with which the locking portions 52b of the upper push lever 52 come into contact are provided at the lower ends of the guide portions 71 and 72 (see FIG. 7).

[0078] <Magnet and Magnet Holder> The nail driver 1A further includes a magnet 80 and a magnet holder 81 held by the slider 60. FIG.

[0079] The magnet 80 is a cylindrical permanent magnet, and one axial end is magnetized to the north pole, and the other axial end is magnetized to the south pole.

[0080] The magnet holder 81 is composed of two point-symmetric holder members 81a and 81b. A recess 82 and a protrusion 83 are formed on one side of each of the holder members 81a and 81b, and a slit 84 is formed on the other side of each of the holder members 81a and 81b.

[0081] The magnet holder 81 is completed when the holder members 81a and 81b are combined together so that the recesses 82 and protrusions 83 fit together. At this time, by placing the magnet 80 between the holder members 81a and 81b, the holder members 81a and 81b are integrated in a state where they face each other with the magnet 80 sandwiched between them. In other words, the magnet 80 is housed in the completed magnet holder 81 at the same time that the magnet holder 81 is completed.

[0082] As described above, the holder members 81a and 81b have point-symmetric shapes. Therefore, the holder member 81a can become the holder member 81b by being inverted. Similarly, the holder member 81b can become the holder member 81a by being inverted.

[0083] From another perspective, the magnet holder 81, which is made up of the holder members 81a and 81b, also has a point-symmetric shape. Therefore, even if the magnet holder 81 is rotated so that the magnetic pole of the magnet 80 is reversed, the outer shape of the magnet holder 81 does not change.

[0084] The magnet holder 81 that houses the magnet 80 is attached to the slider 60. Fig. 12 is a perspective view showing the procedure for attaching the magnet holder 81 to the slider 60.

[0085] The upper support piece 63 of the slider 60 is inserted into the slit 84 of the holder member 81a, and the lower support piece 64 of the slider 60 is inserted into the slit 84 of the holder member 81b.

[0086] From another perspective, the magnet holder 81 is fitted into the fitting portion 68 of the slider 60. More specifically, the magnet holder 81 is fitted into the fitting portion 68 from the magazine side of the slider 60 toward the handle side.

[0087] When the magnet holder 81 is attached to the slider 60 as described above, the holder members 81a and 81b are sandwiched between the upper arm 61 and the lower arm 62, and also between the upper support piece 63 and the lower support piece 64. As a result, separation of the holder members 81a and 81b is restricted. Therefore, it is not necessary to fix the holder members 81a and 81b to each other using adhesive, screws, etc.

[0088] Furthermore, unless the holder members 81a and 81b are separated, the magnet 80 will not fall off, and therefore there is no need to fix the magnet 80 to the holder members 81a and 81b.

[0089] On the other hand, because the holder members 81a and 81b are not fixed to each other, the holder members 81a and 81b can be separated by detaching the magnet holder 81 from the slider 60. Therefore, the magnet holder 81 can be disassembled to remove or replace the magnet 80 as needed, improving the convenience of the nail driver 1A.

[0090] As already mentioned, the outer shape of the magnet holder 81 does not change even if the magnet holder 81 is rotated so that the magnetic poles of the magnet 80 are reversed. Therefore, the magnet holder 81 shown in Fig. 12 can be fitted into the fitting portion 68 of the slider 60 in the same manner as above, even if it is rotated 360 degrees around the imaginary rotation axis C.

[0091] That is, the magnet holder 81 can be attached to the slider 60 in a first orientation (the orientation shown in FIG. 12) and a second orientation (an orientation rotated 360 degrees from the orientation shown in FIG. 12).

[0092] The magnetic pole of the magnet 80 housed in the magnet holder 81 is reversed when the magnet holder 81 is attached to the slider 60 in a first orientation and when the magnet holder 81 is attached to the slider 60 in a second orientation.

[0093] As described above, the magnet holder 81 is detachable from the slider 60. However, when the slider 60 and the guide portions 71 and 72 are combined, the magnet holder 81 is restricted from being separated from the slider 60.

[0094] As described above, when the slider 60 and the guide portions 71 and 72 are combined, the slider 60 is sandwiched between the guide portions 71 and 72. At this time, the lateral guide wall 73 of the guide portion 72 abuts against the magazine-side side surface of the slider 60 or faces the magazine-side side surface of the slider 60 with a small gap therebetween.

[0095] From another perspective, the guide portion 72 is adjacent to the magnet holder 81 fitted in the fitting portion 68, and restricts the magnet holder 81 from moving in the direction opposite to the fitting direction (toward the magazine) relative to the slider 60. As a result, the magnet holder 81 is restricted from coming off the fitting portion 68.

[0096] On the other hand, when the combination of the slider 60 and the guide portions 71, 72 is released, the magnet holder 81 can be moved in the direction opposite to the fitting direction relative to the slider 60. In other words, when the combination of the slider 60 and the guide portions 71, 72 is released, the magnet holder 81 is allowed to be detached from the slider 60.

[0097] As described above, by detaching the magnet holder 81 from the slider 60, the magnet holder 81 can be disassembled to remove or replace the magnet 80.

[0098] <Movement of Slider, Magnet Holder, and Magnet> Figures 13A and 13B are partially enlarged cross-sectional views showing the movement (position change) of the slider 60, magnet holder 81, and magnet 80. The cross sections shown in Figures 13A and 13B are taken along line A-A in Figure 1.

[0099] The slider 60 shown in Fig. 13(A) is located at the first position. On the other hand, the slider 60 shown in Fig. 13(B) is located at the second position. As described above, the slider 60 moves integrally with the push lever 51 between the first and second positions.

[0100] In the following description, the position of the push lever 51 when the slider 60 is in the first position may be referred to as the "push lever OFF position," and the position of the push lever 51 when the slider 60 is in the second position may be referred to as the "push lever ON position."

[0101] From another perspective, when the push lever 51 abuts against the target workpiece W and moves from the push lever OFF position to the push lever ON position, the slider 60 moves from the first position to the second position.

[0102] Furthermore, when the push lever 51 is separated from the target material W and moves from the push lever ON position to the push lever OFF position, the slider 60 moves from the second position to the first position.

[0103] As described above, the slider 60 is disposed between the upper push lever 52 and the board case 6a. The board case 6a accommodates a sensor board 8a on which a magnetic sensor 7a is mounted.

[0104] When the slider 60 moves from the first position to the second position (FIG. 13A→FIG. 13B), the magnet holder 81 (magnet 80) approaches the magnetic sensor 7a mounted on the sensor board 8a.

[0105] On the other hand, when the slider 60 moves from the second position to the first position (FIG. 13B → FIG. 13A), the magnet holder 81 (magnet 80) moves away from the magnetic sensor 7a mounted on the sensor board 8a.

[0106] When the magnet 80 approaches the magnetic sensor 7a, the magnetic field of the magnet 80 is detected by the magnetic sensor 7a. A signal (push lever ON signal) is then output from the magnetic sensor 7a and input to the controller 4 shown in Fig. 3. As a result, the controller 4 can detect that the slider 60 has moved to the second position.

[0107] From another perspective, the controller 4 can detect that the push lever 51 has come into contact with the target workpiece W and moved to the push lever ON position.

[0108] On the other hand, when the magnet 80 moves away from the magnetic sensor 7a, the magnetic field of the magnet 80 is no longer detected by the magnetic sensor 7a, and the push lever ON signal is no longer input to the controller 4. As a result, the controller 4 can detect that the slider 60 has moved to the first position.

[0109] From another perspective, the controller 4 can detect that the push lever 51 has been separated from the target workpiece W and moved to the push lever OFF position.

[0110] The controller 4 controls the striking unit in accordance with the position of the slider 60 (push lever 51). More specifically, input of a push lever ON signal to the controller 4 is one of the conditions for the controller 4 to cause the striking unit to perform a striking operation.

[0111] The magnetic sensor 7a that detects the positions of the slider 60 and the push lever 51 as described above is one of the detection units that detect the position of the movable unit. The magnet 80 detected by the magnetic sensor 7a and the magnet holder 81 that houses the magnet 80 are one of the detected parts detected by the detection unit.

[0112] Furthermore, the slider 60, the magnet 80, and the magnet holder 81 that move between the first and second positions are one of the movable parts. More specifically, the slider 60 that holds the magnet 80 and the magnet holder 81 and moves integrally with the push lever 51 between the first and second positions is one of the holding parts.

[0113] <Blade Detector> The nail driver 1A has a blade detector 90 that moves when it comes into contact with the driver blade 24. FIG.

[0114] An upper support piece 163 and a lower support piece 164 are provided on one side (magazine side) of the blade detector 90, and an abutment protrusion 91 is provided on the other side (handle side) of the blade detector 90.

[0115] A through-hole 92 is provided in the center or approximately the center of the blade detector 90. Furthermore, a fitting portion 168 is provided between the upper support piece 163 and the lower support piece 164. The fitting portion 168 is a recess that opens toward one side in the left-right direction (toward the magazine), similar to the fitting portion 68 of the slider 60 (FIG. 6).

[0116] <Magnet and Magnet Holder> The blade detector 90 holds a magnet holder 81 that is the same as the magnet holder 81 held by the slider 60. Fig. 15 is a perspective view showing the procedure for attaching the magnet holder 81 to the blade detector 90. The magnet holder 81 shown in Fig. 15 contains a magnet 80 that is the same as the magnet 80 shown in Fig. 11.

[0117] The upper support piece 163 of the blade detector 90 is inserted into the slit 84 of the holder member 81a, and the lower support piece 164 of the blade detector 90 is inserted into the slit 84 of the holder member 81b.

[0118] From another perspective, the magnet holder 81 is fitted into the fitting portion 168 of the blade detector 90. More specifically, the magnet holder 81 is fitted into the fitting portion 168 from the magazine side of the blade detector 90 toward the handle side.

[0119] When the magnet holder 81 is attached to the blade detector 90 as described above, the holder members 81a and 81b are sandwiched between the upper support piece 163 and the lower support piece 164. As a result, separation of the holder members 81a and 81b is restricted.

[0120] On the other hand, since the holder members 81a and 81b are not fixed to each other, when the magnet holder 81 is removed from the blade detector 90, the holder members 81a and 81b can be separated.

[0121] <Assembly Member (Torsion Spring)> The blade detector 90 is assembled with the torsion spring 75, which is another assembly member. Figures 16 and 17 are perspective views showing the assembled state of the blade detector 90 and the torsion spring 75.

[0122] The coil portion 75a of the torsion spring 75 is disposed on one side of the blade detector 90, coaxial with the through-hole 92. One arm 75b of the torsion spring 75 is suspended between the upper support piece 163 and the lower support piece 164, crossing the fitting portion 168 in which the magnet holder 81 is fitted.

[0123] From another perspective, the arm 75b of the torsion spring 75 is adjacent to the magnet holder 81 fitted in the fitting portion 168 and straddles the upper support piece 163 and the lower support piece 164. As a result, the arm 75b prevents the magnet holder 81 from coming off the fitting portion 168.

[0124] In other words, when the blade detector 90 and the torsion spring 75 are combined, the magnet holder 81 is restricted from coming off the blade detector 90 .

[0125] On the other hand, when the combination of the blade detector 90 and the torsion spring 75 is released, the magnet holder 81 is allowed to detach from the blade detector 90. The upper support piece 163 and the lower support piece 164 have hook-like shapes with their tips protruding outward, and are engaged with the arms 75b of the torsion spring 75. This prevents the magnet holder 81 from accidentally falling off the blade detector 90.

[0126] Then, by detaching the magnet holder 81 from the blade detector 90, the magnet holder 81 can be disassembled to remove or replace the magnet 80.

[0127] <Blade Detector Mounting State> Figures 18 and 19 are partially enlarged cross-sectional views showing the blade detector 90 mounted in the nose portion 40. The cross section shown in Figure 18 is taken along line E-E in Figure 2. The cross section shown in Figure 19 is taken along line F-F in Figure 4.

[0128] 18, the blade detector 90 is disposed on one side (the magazine side) of the driver blade 24 and is supported so as to be able to rotate. More specifically, the blade detector 90 is supported so as to be able to rotate by a bolt 93 inserted through a through-hole 92 (FIG. 16). Torque is constantly applied to the blade detector 90 by a torsion spring 75.

[0129] Furthermore, the contact protrusion 91 of the blade detector 90 crosses the front surface of the driver blade 24 or at least overlaps the front surface of the driver blade 24. An operation protrusion 24b that protrudes forward is integrally formed on the front surface of the driver blade 24. The operation protrusion 24b is a slender protrusion that is narrower and shorter than the driver blade 24.

[0130] When the driver blade 24 rises to a predetermined position in accordance with the rotation of the pinwheel 33, the operating convex portion 24b comes into contact with the contact protrusion 91 of the blade detector 90 from below, pushing up the contact protrusion 91. As a result, the blade detector 90 rotates clockwise in FIG. 18 against the torque of the torsion spring 75, moving from the first position to the second position.

[0131] On the other hand, when the driver blade 24 descends to a predetermined position, the operation convex portion 24b releases the abutment protrusion 91 from being pushed up. The blade detector 90 then rotates counterclockwise in FIG. 18 due to the torque of the torsion spring 75, moving from the second position to the first position. The movement of the blade detector 90 will be described later.

[0132] 19, a board case 6b is provided near the blade detector 90, and the blade detector 90 overlaps the board case 6b in the front-to-rear direction. A sensor board 8b on which a magnetic sensor 7b is mounted is housed inside the board case 6b.

[0133] <Movement of Blade Detector, Magnet Holder, and Magnet> Figures 20A and 20B are partially enlarged cross-sectional views showing the movement (position change) of the blade detector 90, magnet holder 81, and magnet 80, taken along line E-E in Figure 2. The blade detector 90 shown in Figure 20A is located at a first position. On the other hand, the blade detector 90 shown in Figure 20B is located at a second position.

[0134] As described above, the blade detector 90 is moved from the first position to the second position by the driver blade 24 which has risen to a predetermined position and come into contact with the blade detector 90 .

[0135] When the driver blade 24 descends to a predetermined position and moves away from the blade detector 90, the blade detector 90 is moved from the second position to the first position by the bias of the torsion spring 75.

[0136] In other words, the torsion spring 75 constantly biases the blade detector 90 toward the first position, while the driver blade 24 temporarily moves the blade detector 90 to the second position against the bias of the torsion spring 75.

[0137] As described above, the blade detector 90 is disposed near the board case 6b that houses the sensor board 8b (FIG. 19). When the blade detector 90 moves from the first position to the second position (FIG. 20A → FIG. 20B), the magnet holder 81 (magnet 80) moves away from the magnetic sensor 7b mounted on the sensor board 8b.

[0138] On the other hand, when the blade detector 90 moves from the second position to the first position (FIG. 20B → FIG. 20A), the magnet holder 81 (magnet 80) approaches the magnetic sensor 7b mounted on the sensor board 8b.

[0139] When the magnet 80 approaches the magnetic sensor 7b, the magnetic field of the magnet 80 is detected by the magnetic sensor 7b. A signal (detector ON signal) is then output from the magnetic sensor 7b and input to the controller 4 shown in Fig. 3. As a result, the controller 4 can detect that the blade detector 90 is located at the first position.

[0140] From another perspective, the controller 4 can detect that the driver blade 24 has moved to a predetermined position or to the bottom dead center side of the predetermined position.

[0141] On the other hand, when the magnet 80 moves away from the magnetic sensor 7b, the magnetic field of the magnet 80 is no longer detected by the magnetic sensor 7a, and the input of the detector ON signal to the controller 4 is then discontinued. As a result, the controller 4 can detect that the blade detector 90 has moved to the second position.

[0142] From another perspective, the controller 4 can detect that the driver blade 24 has moved to a predetermined position or to the top dead center side of the predetermined position.

[0143] The controller 4 controls the striking unit in accordance with the position of the blade detector 90. For example, when the controller 4 detects that the blade detector 90 has moved to the second position, it cuts off the power supply from the battery pack 3 to the motor 31. In other words, it stops the drive mechanism. This allows the driver blade 24 to stop at a standby position between the bottom dead center and the top dead center.

[0144] The magnetic sensor 7b that detects the positions of the blade detector 90 and the driver blade 24 as described above is another type of detecting unit that detects the position of the movable unit. The magnet 80 detected by the magnetic sensor 7b and the magnet holder 81 that houses the magnet 80 are another type of detected unit that is detected by the detecting unit.

[0145] Furthermore, the blade detector 90, the magnet 80, and the magnet holder 81, which move between the first and second positions, are another movable part. More specifically, the blade detector 90, which moves between the first and second positions by contacting the driver blade 24, is another holding part.

[0146] The magnetic sensors 7a and 7b are not limited to a specific sensor, but in this embodiment, Hall ICs are used.

[0147] <Modification 1> Fig. 21 is a plan view showing a modification of the magnet holding structure, more specifically, a modification of the slider.

[0148] The slider 260 shown in FIG. 21 is provided with a fitting portion 268 capable of accommodating a portion of the magnet 80. Meanwhile, the magnet holder 81 shown in FIG. 21 is provided with an accommodating groove 85 capable of accommodating another portion of the magnet 80. From another perspective, the fitting portion 268 and the accommodating groove 85 are recesses each capable of accommodating half of the magnet 80 in the radial direction. The configurations of the fitting portion 268 and the accommodating groove 85 are not limited to the present embodiment. For example, the fitting portion 268 may have a depth capable of accommodating the entire magnet 80, and the magnet holder 81 may be a flat lid without an accommodating groove. Alternatively, the accommodating groove 85 may have a depth capable of accommodating the entire magnet 80, and the slider 260 may be a flat lid without an fitting portion.

[0149] Fig. 22A is a plan view showing the state in which the magnet 80 is held by the slider 260 and magnet holder 81 shown in Fig. 21, and Fig. 22B is a side view. After the magnet 80 is fitted into the fitting portion 268 of the slider 60, the upper support piece 263 of the slider 260 is inserted into one of the slits 84 of the magnet holder 81, and the lower support piece 264 of the slider 260 is inserted into the other of the slits 84 of the magnet holder 81.

[0150] As a result, the magnet 80 is accommodated and held between the fitting portion 268 and the accommodation groove 85 .

[0151] <Modification 2> Figure 23 is a plan view showing a modification of the upper push lever. The upper push lever 352 shown in Figure 23 is provided with a fitting portion 368 into which the magnet holder 81 is fitted. The fitting portion 368 is a recess that opens toward one side in the left-right direction (the magazine side).

[0152] In this modified example, the magnet holder 81 is fitted into and held in the fitting portion 368 of the upper push lever 352 facing the other side in the left-right direction (the handle side).

[0153] In this case, a part of the upper push lever 352 located on one side (upper side) of the fitting portion 368 functions as the above-mentioned upper support piece 63, and another part of the upper push lever 352 located on the other side (lower side) of the fitting portion 368 functions as the above-mentioned lower support piece 64.

[0154] 24 is an enlarged view showing the upper push lever 352 shown in FIG. 23 attached to the nose portion 40. As shown in the figure, the upper push lever 352 is combined with the guide portions 71 and 72, which are assembly members. More specifically, the upper push lever 352 is disposed between the opposing guide portions 71 and 72, and is guided by these guide portions 71 and 72 to move up and down.

[0155] That is, in this modified example, the upper push lever 352 holding the magnet holder 81 is guided by the guide portions 71 and 72 to move between the first position and the second position.

[0156] At this time, the guide portion 72 located on one side (magazine side) of the upper push lever 352 is adjacent to the magnet holder 81. As a result, the magnet holder 81 is prevented from coming off the fitting portion 368. It is clear that the magnet holder 81 can be released from the fitting portion 368 by removing the upper push lever 352 from between the guide portions 71, 72.

[0157] In this modified example, the lower push lever 53 corresponds to the contact part. The upper push lever 352, which holds the magnet 80 and the magnet holder 81 and moves integrally with the lower push lever 53 between the first position and the second position, is another movable part, and more specifically, another holding part.

[0158] The present invention is not limited to the above-described embodiment and modifications, and various modifications are possible without departing from the spirit and scope of the present invention. For example, the magnet 80 may be cast into the slider 60, the magnet holder 81, or the push lever 51.

[0159] In the present embodiment, the guide portions 71 and 72, which are an example of assembly members, sandwich the slider 60, which is an example of a holding portion, and guide the movement between the first position and the second position. However, the assembly members do not necessarily need to be fitted into the holding portions to guide the holding portions. For example, the holding portions may be supported by a separate member, and the assembly members may be configured to be combined (abut) with the assembly members so that the assembly members prevent the detected portion from falling off the holding portions.

[0160] 1... Nail gun main body, 1A... Nail gun, 2... Magazine, 2a... Feeder, 3... Battery pack, 4... Controller, 5... Coil spring, 6a, 6b... Board case, 7a, 7b... Magnetic sensor, 8a, 8b... Sensor board, 10... Housing, 11... Main body, 12... Handle, 13... Motor accommodating section, 14... Connecting section, 21... Cylinder, 22... Pressure accumulator container, 23... Piston, 24... Driver blade, 24a... Rack 24b...operation convex portion, 25...pressure chamber, 31...motor, 32...reduction mechanism portion, 33...pinwheel, 33a...pinion pin, 40...nose portion, 41...tubular portion, 42...nose main body, 43...bumper, 44...wheel accommodating portion, 45...blade guide, 46...front guide member, 47...rear guide member, 48...support tube, 49...engaging protrusion, 50...push lever unit, 51...push lever, 52, 352...upper push Push lever, 52a, 352a...connecting ring, 52b, 352b...locking portion, 53...lower push lever, 53a...adjusting shaft, 54...adjuster, 54a...connecting shaft, 60, 260...slider, 61, 261...upper arm, 62, 262...lower arm, 63, 163, 263...upper support piece, 64, 164, 264...lower support piece, 65, 66, 67, 265, 266, 267...slide piece, 68, 168, 2 68, 368...fitting portion, 71, 72...guide portion, 73...side guide wall, 74...front guide wall, 75...torsion spring, 75a...coil portion, 75b...arm, 80...magnet, 81...magnet holder, 81a, 81b...holder member, 82...recess, 83...protrusion, 84...slit, 85...accommodating groove, 90...blade detector, 91...abutment protrusion, 92...through hole, 93...bolt, C...virtual rotation axis, W...mating material

Claims

1. A work machine comprising: an ejection section that supports a fastener; an impact section that impacts the fastener supported by the ejection section; a movable section that is movable between a first position and a second position; an assembly member that engages with the movable section; and a detection section that detects the position of the movable section, wherein the movable section includes a detectable section that is detected by the detection section, and a holding section that engages with the assembly member and holds the detectable section, wherein the detectable section is restricted from being separated from the holding section when the holding section and the assembly member are assembled, and is allowed to be separated from the holding section when the assembly member and the holding section are released.

2. A work machine as described in claim 1, wherein the holding portion has an engagement portion into which the detectable portion engages, and the assembly member is adjacent to the detectable portion and prevents the detectable portion from coming off the engagement portion when the holding portion and the assembly member are combined.

3. The work machine according to claim 2, wherein the mounting member guides movement of the movable part in a direction intersecting the fitting direction of the detected part relative to the fitting part.

4. The work machine according to claim 2, wherein said mounting member biases said movable part toward said first position.

5. A work machine as described in claim 1, further comprising an abutment portion that moves in a predetermined direction when abutted against a mating material into which the fastener is driven, wherein the movable portion moves integrally with the abutment portion between the first position and the second position.

6. A work machine as described in claim 1, wherein the movable part moves from the first position to the second position by abutting against a mating material into which the fastener is driven, and moves from the second position to the first position by moving away from the mating material.

7. The work machine according to claim 1, wherein the movable part moves between the first position and the second position by abutting against the striking part.

8. A work machine as claimed in any one of claims 5 to 7, further comprising a control unit that controls the impact unit in accordance with the position of the movable unit.

9. A work machine as described in claim 1, wherein the detectable part has a magnet and a magnet holder that houses the magnet, the magnet holder is composed of two holder members that face each other with the magnet in between, and the two holder members are restricted from separation when attached to the holding part and are allowed to separate when detached from the holding part.

10. The work machine described in claim 9, wherein the magnet holder can be attached to the holding portion in a first orientation and a second orientation, and the magnetic poles of the magnet housed therein are reversed when the magnet holder is in the first orientation and when the magnet holder is in the second orientation.

11. A work machine comprising: an ejection section that supports a fastener; a striking section that strikes the fastener supported by the ejection section; a contact section that moves when brought into contact with a mating material into which the fastener is driven; a movable section that can move in a first direction as the contact section moves; a guide section that faces the movable section in a second direction intersecting the first direction and guides the movement of the movable section in the first direction; and a detection section that detects the position of the movable section, wherein the movable section includes a detectable section that is detected by the detection section and a holding section that holds the detectable section, wherein the detectable section is held in the holding section by moving relatively in the second direction, and when the holding section and the guide section are combined while held in the holding section, the detectable section comes into contact with the guide section in the second direction, thereby restricting removal from the holding section, and when the combination of the holding section and the guide section is released, removal from the holding section is permitted.

Images