Working machine

Abstract

Provided is a working machine having improved convenience. A working machine 10 includes an ejecting unit 44, a striking unit 52, a control unit 70, a housing 12, and a detachable unit 74. The ejecting unit 44 ejects nails N. The striking unit 52 strikes a nail N located in the ejecting unit 44. The control unit 70 controls a striking action performed by the striking unit 52. The housing 12 includes the ejecting unit 44, the striking unit 52, and the control unit 70. The detachable unit 74 is provided so as to be capable of being attached to and removed from the housing 12, and when attached to the housing 12, positions the nails N in the ejecting unit 44. The control unit 70 restricts the striking action performed by the striking unit 52 when the detachable unit 74 is not attached to the housing 12.

Description

Work equipment

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

[0002] The nail driver described in Patent Document 1 has a magazine attached to the main body of the nail driver. The magazine is loaded with nails. The nails loaded in the magazine are supplied to an ejection passage. The nails supplied to the ejection passage are struck by an impact unit.

[0003] International Publication No. 2022 / 075449

[0004] In a work machine configured with a detachable attachment part that can be attached to the main body, there is a possibility that a malfunction may occur when the attachment part is detached. For example, if a striking operation is performed by the striking part with the magazine detached from the main body, there is a risk that the components that make up the striking part may wear out, which may reduce the convenience of the work machine.

[0005] An object of the present invention is to provide a work machine with improved convenience.

[0006] In one embodiment, the work machine includes an ejection unit, an impact unit, a control unit, a main body unit, and a detachable unit. The ejection unit ejects a fastener. The impact unit impacts the fastener located in the ejection unit. The control unit controls the impact operation by the impact unit. The main body unit houses the ejection unit, the impact unit, and the control unit. The detachable unit is detachably attached to the main body unit and positions the fastener at the ejection unit when attached to the main body unit. The control unit restricts the impact operation by the impact unit when the detachable unit is not attached to the main body unit.

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

[0008] 1 is a left side view showing the appearance of the working machine of the first embodiment. FIG. 1 is an explanatory diagram showing the internal configuration of the working machine of FIG. 1. FIG. 1 is a circuit block diagram showing each component of the working machine of FIG. 1. FIG. 1 is a cross-sectional view (corresponding to the cross section along line A-A in FIG. 1) of the working machine with the magazine detached from the housing. FIG. 1 is a perspective view showing a part of the housing and a part of the magazine of the working machine of FIG. 1. FIG. 1 is an explanatory diagram showing a state in which a plurality of nails stored in the magazine of the working machine of FIG. 1 are fed to an ejection section by a feeder. FIG. 1 is a perspective view showing the position of a magnet holder when the remaining number of nails in the magazine of the working machine of FIG. 1 has decreased to a predetermined number. FIG. 1 is an explanatory diagram showing the position of a magnet holder when the remaining number of nails in the magazine of the working machine of FIG. 1 has decreased to a predetermined number. FIG. 1 is a view in which the part corresponding to the magazine of the working machine of FIG. 1 has been replaced with an attachment member. FIG. 1 is an explanatory diagram showing a state in which the magazine is being removed from the housing of the working machine of FIG. 1 after the remaining number of nails in the magazine has decreased to a predetermined number. FIG. 1 is an explanatory diagram showing a part of the internal structure of the working machine of a second embodiment. FIG. 11 is an explanatory diagram showing a state in which the magazine is being removed from the housing of the working machine of FIG. 11. 14 is a circuit block diagram showing each component of the work machine of Figure 13. FIG. 21 is an explanatory diagram showing the supply paths and switching unit of the work machine of Figure 13. FIG. 21 is an explanatory diagram showing a state in which the magazine is in the middle of being detached from the housing in the work machine of Figure 13. FIG. 21 is a circuit block diagram showing each component of the work machine of a fourth embodiment. FIG. 21 is an explanatory diagram showing a part of the internal structure of the work machine of a fifth embodiment. FIG. 21 is an explanatory diagram showing the signal paths of the work machine of Figure 18. FIG. 21 is an explanatory diagram showing a state in which the magazine is in the middle of being detached from the housing in the work machine of Figure 18. FIG. 21 is a left side view showing the appearance of the work machine of a sixth embodiment. FIG. 21 is a left side view of the work machine of Figure 21 with the magazine cover positioned in the open position.

[0009] Hereinafter, work machines according to first, second, third, and fourth embodiments and modifications of the present invention will be described in detail with reference to the drawings. Note that in all drawings referred to in describing each embodiment and modification, 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. Some cross-sectional views omit hatching to clearly show the configuration of each part (e.g., Figures 6 and 8).

[0010] 1 shows a working machine 10 according to a first embodiment. The working machine 10 is a nailing machine that drives nails N, which are an example of fasteners, into a mating material G.

[0011] The direction in which a striking unit 52 (FIG. 2), which will be described later, strikes the nail N is defined as the front-rear direction. The striking unit 52 strikes the nail N toward the front in the front-rear direction. Directions perpendicular to the front-rear direction are defined as the up-down direction and the left-right direction. The up-down direction and the left-right direction are perpendicular to each other. Note that the up-down direction, the front-rear direction, and the left-right direction are defined merely for the convenience of explanation.

[0012] 2, the work machine 10 includes a housing 12, an ejection unit 44, a striking unit 52, a control unit 70, and a detachable unit 74. The work machine 10 also includes a trigger 28, a battery pack 36, a Hall IC 68 (FIG. 3), a magnet 85 (FIG. 4), and a feeder 88 (FIG. 1).

[0013] <Housing> The housing 12 is made up of two housing members that are butted against each other in the left-right direction and fixed with screws (not shown). As a result, the various components of the work machine 10 are housed inside the housing 12. The housing 12 is an example of a main body that includes the ejection unit 44, the impact unit 52, and the control unit 70.

[0014] The housing 12 has a cylinder case 14, a handle 16, a motor case 18, a battery mounting portion 22, and a mounting portion 24. A cylinder 26 is supported within the cylinder case 14.

[0015] The handle 16 extends in a diagonal direction intersecting the up-and-down direction of the work machine 10. A trigger 28 is provided above the handle 16. An operator can operate the trigger 28 while holding the handle 16. A trigger switch 29 is provided inside the handle 16. When an operating force is applied to the trigger 28, the trigger switch 29 transmits an operating signal (ON signal) to the control unit 70. When the operating force on the trigger 28 is released, the trigger switch 29 stops transmitting the operating signal.

[0016] The motor case 18 houses the motor 32 and the gear case 34. The motor case 18 has a cylindrical shape that extends along the rotation axis M1 of the motor 32. The rotation axis M1 of the motor 32 extends in the vertical direction. The motor 32 is connected to an inverter circuit 33 (FIG. 3).

[0017] The battery attachment section 22 is located below the handle 16 and the motor case 18. A battery pack 36 is detachably attached to the battery attachment section 22. A power supply circuit 66 (FIG. 3) is provided on a path electrically connecting the battery pack 36 and the control section 70. The battery pack 36 and the power supply circuit 66 are an example of a power supply. Inside the housing 12, the control section 70 is housed in front of the battery attachment section 22 and below the motor case 18.

[0018] The mounting part 24 has a rotatable operating lever 38, a locking part 39 that rotates in conjunction with the rotation of the operating lever 38, and an engaged part 42 that engages with the upper end of the detachable part 74. The attachment and detachment of the detachable part 74 to the mounting part 24 will be described later.

[0019] <Injection Section> The injection section 44 is located in front of the cylinder 26. The injection section 44 extends in the front-to-rear direction from the front end of the cylinder 26 to the front side. The injection section 44 includes a shaft 59, a lock shaft 61, and a blade guide 64.

[0020] The shaft 59 and the lock shaft 61 are provided forward of a bumper support portion 58, which will be described later. The shaft 59 and the lock shaft 61 are used to switch the push lever 48, which will be described later, between a fixed state and a released state.

[0021] The blade guide 64 extends forward from the front end of the housing 12. The blade guide 64 is provided with an injection passage 46. A driver blade 56 (described later) is provided in the injection passage 46 so as to be movable in the front-rear direction.

[0022] When the nail N receives a striking force from a striking section 52 (described later) in the ejection section 44, the nail N is ejected toward the target material G. The ejection section 44 is also provided with a push lever 48. The push lever 48 is held by the ejection section 44 so that it can move in the front-to-rear direction. The push lever 48 is biased forward by a spring (not shown). When the push lever 48 is pressed against the target material G (FIG. 1), it moves rearward against the biasing force of the spring.

[0023] A push lever switch 49 (FIG. 3) is provided on the movement path of the push lever 48. The push lever switch 49 detects that the push lever 48 has reached a predetermined position and transmits a signal indicating the position of the push lever 48 to the control unit 70. In this way, the push lever 48 switches between an ON state and an OFF state depending on whether or not it is in contact with the mating material G into which the nail N is driven. The ON state is a state in which the push lever 48 is in contact with the mating material G. The OFF state is a state in which the push lever 48 is not in contact with the mating material G.

[0024] The trigger 28 and the push lever 48 are each an example of an operating part that causes the striking part 52 to perform a striking action when operated by the worker.

[0025] <Striking Section> The striking section 52 strikes the nail N located in the ejection section 44 forward. The striking section 52 has a piston 54, a driver blade 56, a bumper support section 58, and a bumper 62. The piston 54 has a cylindrical shape centered on an axis along the front-to-rear direction. The piston 54 is located forward of the pressure accumulator container 19 provided in the housing 12. The piston 54 is urged forward by the pressure in the pressure chamber 21 of the pressure accumulator container 19.

[0026] The driver blade 56 is, for example, a metal member. The driver blade 56 is connected to the piston 54 and extends forward from the piston 54. The driver blade 56 is provided with a plurality of racks (not shown). The plurality of racks receive a driving force from the motor 32 via a transmission mechanism (not shown). Specifically, the driver blade 56 moves rearward when it receives the driving force from the motor 32. Furthermore, the driver blade 56 moves forward when it receives the pressure from the pressure chamber 21.

[0027] The bumper support portion 58 and the bumper 62 are located forward of the cylinder 26. The bumper support portion 58 is located forward of the bumper 62 and supports the bumper 62. The bumper 62 is made of synthetic rubber, such as elastomer.

[0028] <Detachable Portion> As shown in FIG. 1 , the detachable portion 74 is provided so as to be detachable (attachable and detachable) to the mounting portion 24 of the housing 12 .

[0029] As shown in FIG. 2 , in more detail, the blade guide 64 has an opening 99 that communicates between the inside and outside of the injection passage 46, and the detachable portion 74 is attached to the mounting portion 24 so as to cover the opening 99 and is detachable. The detachable portion 74 covers the opening 99 when attached to the housing 12, preventing the nail N from falling out of the injection portion 44 through the opening 99, thereby positioning the nail N in the injection portion 44. The detachable portion 74 is supported by the housing 12 when attached to the mounting portion 24. Note that the detachable portion 74 includes, for example, a magazine 76 ( FIG. 4 ) that stores nails N and an attachment member 92 ( FIG. 9 ) that does not store nails N. The magazine 76 and the attachment member 92 are each detachable from the housing 12 independently.

[0030] <<Magazine>> The magazine 76 shown in Fig. 4 positions nails N in the ejection section 44 when attached to the housing 12. The magazine 76 can supply nails N to the ejection section 44. In other words, when attached to the housing 12, the magazine 76 is in a supply-enabled state where it can supply nails N to the ejection section 44, and when not attached to the housing 12, it is in a supply-disabled state where it cannot supply nails N to the ejection section 44. The magazine 76 includes a magazine body 77, a slide knob 78, a coil spring 79, a shaft 82, a magnet holder 84, a first magnet 86, and a feeder 88. Note that Fig. 4 does not show a cover member that covers the magazine body 77 from the rear.

[0031] The magazine body 77 extends in the vertical direction. A portion of the blade guide 64 is provided at the upper end of the magazine body 77. A rib 77B that comes into contact with the upper end of the coil spring is provided on the left side wall 77A of the magazine body 77. The rib 77B protrudes from the left side wall 77A toward the right side of the magazine body 77. The rib 77B compresses the coil spring 79 in the vertical direction when the slide knob 78 is raised.

[0032] As shown in FIG. 2 , an engaging portion 77C protruding forward is provided at the upper end of the magazine body 77. The engaging portion 77C engages with the engaged portion 42 to prevent the upper end of the magazine body 77 from shifting out of position. A locked portion 77D extending rearward is provided at the bottom of the magazine body 77. The locked portion 77D has a U-shaped outer shape when viewed from the left and right. The locked portion 77D engages with the locking portion 39 to prevent the magazine 76 from being removed from the housing 12. In other words, with the engaging portion 77C engaged with the engaged portion 42, the rotated locking portion 39 engages with the locked portion 77D, thereby attaching the magazine 76 to the housing 12.

[0033] As shown in FIG. 5 , the slide knob 78 has a front wall 78A, a rear wall 78B, a bottom wall 78C, a top wall 78D, and a protrusion 78E. A coil spring 79 is housed in the space surrounded by the front wall 78A, the rear wall 78B, the bottom wall 78C, and the top wall 78D. A contact surface 78F is formed at the lower end of the front wall 78A. The protrusion 78E protrudes upward from the top wall 78D. The protrusion 78E has an inclined surface 78G that extends in a direction intersecting the up-down direction when viewed from the front-to-rear direction. As an example, the inclined surface 78G is inclined at an angle of 45° with respect to the up-down direction.

[0034] 4, the upper end of the coil spring 79 is attached to the lower surface of the rib 77B. The lower end of the coil spring 79 is in contact with the bottom wall 78C. Therefore, when the slide knob 78 is raised, the coil spring 79 is compressed by being sandwiched between the rib 77B and the bottom wall 78C.

[0035] The shaft 82 is located above the slide knob 78. The shaft 82 is formed in a cylindrical shape with a central axis extending in the front-to-rear direction. Both axial ends of the shaft 82 are supported by parts of the magazine body 77.

[0036] The magnet holder 84 has a connecting portion 84A connected to the shaft 82, a lower arm portion 84B extending downward from the connecting portion 84A, and an upper arm portion 84C extending upward from the connecting portion 84A. The lower arm portion 84B is formed with a curved surface 84D that comes into contact with the inclined surface 78G. The magnet holder 84 is rotatable around the shaft 82. The magnet holder 84 is an example of a detected part detected by the Hall IC 68.

[0037] The first magnet 86 is attached to the upper part of the upper arm part 84 C. For example, when three or more nails N are stored (loaded) inside the magazine body 77, the magnet holder 84 is in an upright position with the shaft 82 and the first magnet 86 aligned vertically.

[0038] As shown in FIG. 6 , the feeder 88 is located below the magazine body 77 when multiple nails N are loaded in the attachment / detachment section 74. The feeder 88 receives a biasing force from a spring (not shown) to bias the nails N toward the ejection section 44, and rises each time a nail N is struck (consumed), supplying the nail N to the ejection section 44 ( FIG. 2 ). In other words, when the magazine 76 is attached to the housing 12, it is in a biased state in which it applies a biasing force to the nails N, and when it is not attached to the housing 12, it is in a non-biased state in which it does not apply a biasing force to the nails N. Note that in FIG. 6 , the feeder 88 is shown on the rear side of the magazine body 77 to clearly show the position of the feeder 88 relative to the magazine body 77. The feeder 88 has a feeder body 88A, a first knob 88B, an arm 88C, a second knob 88D, a protrusion 88E, and a spring (not shown).

[0039] The feeder body 88A is provided on the magazine body 77. The feeder body 88A is movable in the vertical direction relative to the magazine body 77. The feeder body 88A is biased upward by a spring (not shown). The first knob 88B extends to the left from the feeder body 88A.

[0040] The arm 88C is rotatably connected to the upper part of the feeder body 88A. The arm 88C comes into contact with the lowest nail N in the attachment / detachment section 74. The arm 88C then biases the nails N upward. The second knob 88D extends to the left from the arm 88C.

[0041] The protrusion 88E protrudes rearward from the feeder body 88A and is located below the contact surface 78F of the slide knob 78. As the feeder 88 rises, the protrusion 88E comes into contact with the contact surface 78F and pushes the slide knob 78 upward.

[0042] When a sufficient number of nails N are loaded in the detachable portion 74, the upper arm portion 84C is positioned vertically. Therefore, the first magnet 86 faces the Hall IC 68 in the vertical direction. In other words, the Hall IC 68 detects the presence of the first magnet 86.

[0043] As shown in Figures 7 and 8, when the remaining amount of nails N is at its lowest, the feeder 88 moves toward the upper end of its movable range. At this time, the slide knob 78 rises, causing the central axis of the magnet holder 84 to rotate so that it forms an angle θ (Figure 8) with respect to the vertical direction. As a result, the lower arm 84B separates from the inclined surface 78G, and the upper arm 84C tilts to the left. In other words, the first magnet 86 is positioned outside the detection area of ​​the Hall IC 68.

[0044] When loading multiple nails N into the removable portion 74, the multiple nails N are loaded below the feeder 88 in the state shown in FIG. 7. Next, the first knob 88B and the second knob 88D are pinched. At this time, the second knob 88D rotates toward the first knob 88B, so that even if the feeder 88 is moved downward, the arm 88C does not interfere with the nails N. Next, while holding the first knob 88B and the second knob 88D, the operator moves the feeder 88 to the bottom end of the removable portion 74 (FIG. 8). Then, the operator releases the first knob 88B and the second knob 88D.

[0045] The feeder body 88A is biased upward by a spring (not shown) and moves toward the nail N. At this time, the arm portion 88C and the second knob portion 88D return to their original positions, causing the arm portion 88C to come into contact with the nail N at the bottom end. As a result, all of the multiple nails N are biased toward the ejection unit 44.

[0046] <<Attachment Member>> As shown in Figure 9, when the attachment member 92 is used, a cover 94 serving as the attachment member 92 is attached to the housing 12. The cover 94 is attached to the injection unit 44 (Figure 2) so as to cover an opening 99 provided in the blade guide 64. Unlike the magazine 76 (Figure 6), the cover 94 does not store nails N. Therefore, with the cover 94 attached to the mounting unit 24, the operator loads the nails N into the injection unit 44 by inserting the nails N from the front end of the injection passage 46 (Figure 2) backward.

[0047] The mounting member 92 is, for example, a cover member that is detachably attached to the housing 12. When attached to the housing 12, the mounting member 92 covers the opening 99 and also functions as a guide for the nail N, thereby positioning the nail N in the ejection unit 44. In other words, the mounting member 92 is an example of a member that allows the nail N to be supplied to the ejection unit 44.

[0048] The mounting member 92 has a second magnet 98 provided on the cover 94. When the mounting member 92 is attached to the housing 12, the second magnet 98 is detected by the Hall IC 68.

[0049] The state in which the mounting member 92 is detached from the housing 12 is included in the state in which the control unit 70 (FIG. 3) restricts the striking operation of the nail N. Therefore, when the Hall IC 68 detects that the second magnet 98 is absent, the striking operation by the striking unit 52 (FIG. 2) is not performed.

[0050] <Magnet> As shown in Fig. 4, the detachable portion 74 is provided with a magnet 85. The magnet 85 is an example of a detected portion. The magnet 85 includes a first magnet 86 provided in the magazine 76 and a second magnet 98 (Fig. 9) provided in the mounting member 92 (Fig. 9). The first magnet 86 and the second magnet 98 are each an example of a detected portion detected by the Hall IC 68. The magnetic field of the first magnet 86 and the magnetic field of the second magnet 98 are different in strength.

[0051] The state (position) of the first magnet 86 changes depending on the remaining number of nails N stored in the magazine 76. Specifically, the first magnet 86 is attached to a magnet holder 84, which will be described later. The distance (positional relationship) between the first magnet 86 and the Hall IC 68 changes as the magnet holder 84 is rotated.

[0052] <Circuit Block Diagram> Figure 3 shows a circuit block diagram of the work machine 10. A main circuit unit 20 is provided in the housing 12. The main circuit unit 20 includes a trigger switch 29, a motor 32, an inverter circuit 33, a push lever switch 49, a power supply circuit 66, a control unit 70, terminals T1 and T2, and a Hall IC (Integrated Circuit) 68 (described later). The battery pack 36 is provided with terminals T3 and T4. Terminal T3 contacts terminal T1. Terminal T4 contacts terminal T2. This allows power to be supplied from the battery pack 36 to each component of the main circuit unit 20.

[0053] The control unit 70 receives power from the power supply circuit 66. The control unit 70 controls the operation or stop of the inverter circuit 33 based on signals sent from the trigger switch 29, the push lever switch 49, and the Hall IC 68. The inverter circuit 33 supplies the power received from the battery pack 36 to the motor 32.

[0054] <Hall IC> As shown in Fig. 4, the Hall IC 68 is provided, for example, on the left side of the blade guide 64 of the housing 12. The Hall IC 68 is an example of a sensor that detects the state of a magnet 85 (described later) and transmits a detection information signal to the control unit 70. The Hall IC 68 detects the magnetic strength of the magnet 85 (presence or absence of the magnet 85) and transmits a detection signal corresponding to the magnetic strength to the control unit 70 (Fig. 3).

[0055] The Hall IC 68 can also detect a first magnet 86 of the magazine 76 (described later) and a second magnet 98 (FIG. 9) of the mounting member 92 (FIG. 9), and can distinguish between the first magnet 86 and the second magnet 98. Specifically, because the magnetic strength of the first magnet 86 and the magnetic strength of the second magnet 98 are different, the Hall IC 68 (controller 70) can distinguish between the first magnet 86 and the second magnet 98.

[0056] Furthermore, the Hall IC 68 can detect the presence or absence of the first magnet 86 and the remaining number of nails N in the magazine 76 in response to a change in the state (change in position) of the first magnet 86, which will be described later.

[0057] 7, a Hall IC 69 is provided behind the Hall IC 68. The Hall IC 69 detects the position of the push lever 48 (FIG. 2).

[0058] 2 is a microcomputer including a processor and a memory. The control unit 70 controls the impact operation by the impact unit 52. The control unit 70 also controls the operation of each unit of the work machine 10 in addition to the impact unit 52. When the piston 54 is at a predetermined front position, the control unit 70 activates the motor 32 to move the piston 54 to a predetermined rear position.

[0059] When both the signal generated by the operation of the push lever 48 and the signal generated by the operation of the trigger 28 are input, the control unit 70 activates the motor 32. As the piston 54 moves to a predetermined position on the front side due to the pressure in the pressure chamber 21, the driver blade 56 moves forward and strikes the nail N. As a result, the nail N is driven out of the ejection unit 44.

[0060] The control unit 70 controls the striking action of the striking unit 52 in accordance with the detection information of the Hall IC 68 (FIG. 3). Note that the control unit 70 has a preset magnetic threshold value.

[0061] <<Control When One Type of Magazine is Used>> The following describes the control by the control unit 70 when one type of detachable unit 74 is used. If the magnetic strength detected by the Hall IC 68 is lower than the threshold value, the control unit 70 determines that the detachable unit 74 is not attached to the mounting unit 24. When the control unit 70 determines that the detachable unit 74 is not attached to the housing 12, it performs control to restrict the striking action of the striking unit 52.

[0062] On the other hand, if the magnetic strength detected by the Hall IC 68 is equal to or greater than the threshold value, the control unit 70 determines that the detachable unit 74 is attached to the attachment unit 24. When the control unit 70 determines that the detachable unit 74 is attached to the housing 12, it performs control to permit the striking operation by the striking unit 52.

[0063] <<Control When Trigger and Push Lever Are Operated>> When the control unit 70 determines, based on detection information from the Hall IC 68, that the detachable unit 74 is attached to the housing 12 while at least one of the trigger 28 and the push lever 48 is operated, the control unit 70 performs control to restrict the striking action of the striking unit 52. As an example, when the push lever 48 is in the on state and the control unit 70 determines that the detachable unit 74 is attached to the housing 12, and then the push lever 48 switches from the off state to the on state again, the control unit 70 performs control to permit the striking action of the striking unit 52. Note that control may also be performed based on the on / off state of the trigger 28 instead of the push lever 48. Alternatively, control may be performed based on the on / off state of both the trigger 28 and the push lever 48.

[0064] <<Control When Attaching or Detaching a Magazine or an Attachment Member to a Housing>> The following describes the control by the control unit 70 when using either the magazine 76 or the attachment member 92. As described above, the magnetic strength of the first magnet 86 and the magnetic strength of the second magnet 98 are different. Therefore, the control unit 70 can determine whether the magazine 76 or the attachment member 92 is attached to the housing 12, based on the magnetic strength information obtained by the Hall IC 68.

[0065] When the control unit 70 determines, based on the detection information obtained by the Hall IC 68, that the first magnet 86 (FIG. 4) is present and that the remaining number of nails N is equal to or greater than a predetermined number, it controls to permit the striking operation of the striking unit 52. When the control unit 70 determines, based on the detection information obtained by the Hall IC 68, that the first magnet 86 is absent and that the remaining number of nails N is less than a predetermined number, it controls to restrict the striking operation of the striking unit 52.

[0066] After restricting the striking action of the striking section 52, if the control section 70 determines based on the detection information of the Hall IC 68 that the mounting member 92 (Figure 9) is attached to the housing 12, it releases the restriction on the striking action of the striking section 52.

[0067] 4, when the detachable part 74 is detached from the housing 12, the magnetic value detected by the Hall IC 68 becomes lower than a predetermined threshold value. Therefore, the control unit 70 (FIG. 2) determines that the detachable part 74 is not attached to the housing 12, and restricts the striking action of the striking part 52 (FIG. 2). This makes it possible to prevent the striking part 52 from striking empty balls.

[0068] As shown in Figure 10, when the detachable part 74 is attached to the housing 12, the first magnet 86 is positioned so as to face the Hall IC 68 in the vertical direction. The Hall IC 68 detects the magnetism of the first magnet 86 and transmits the detection information to the control unit 70 (Figure 2). The control unit 70 determines that the detachable part 74 is attached to the housing 12 and permits the striking part 52 (Figure 2) to perform a striking operation. This allows the striking part 52 to strike the nail N.

[0069] As the nails N in the removable portion 74 are consumed, when the remaining number of nails N gradually drops below a predetermined number (e.g., two nails), the protrusion 88E (FIG. 8) of the feeder 88 comes into contact with the contact surface 78F of the slide knob 78, exerting an upward force on the slide knob 78. A component of this force acts as a rotational force from the inclined surface 78G to the curved surface 84D, causing the magnet holder 84 to begin rotating. As the slide knob 78 rises further, the magnet holder 84 further rotates. The first magnet 86 is then positioned outside the detection area of ​​the Hall IC 68. This allows the control unit 70 (FIG. 2) to determine that the remaining number of nails N in the removable portion 74 has decreased to the predetermined number. The control unit 70 may notify the operator that the remaining number of nails N is low by using an alarm unit that outputs sound from a speaker, flashes a lamp, or displays a message.

[0070] When the detachable part 74 is detached from the housing 12 in order to load a nail N into the detachable part 74, the magnetic value detected by the Hall IC 68 becomes lower than a predetermined threshold value. This causes the control unit 70 to determine that the detachable part 74 is not attached to the housing 12.

[0071] As described above, in the work machine 10, the control unit 70 (FIG. 2) restricts the striking action of the striking unit 52 (FIG. 2) when the detachable unit 74 is not attached to the housing 12. This makes it possible to prevent the nail N from being accidentally fired when there is a nail N in the ejection unit 44 (FIG. 2), and to prevent damage to at least one of the striking unit 52 and the ejection unit 44 due to blank firing when there is no nail N in the ejection unit 44, thereby improving the convenience of the work machine 10.

[0072] In the work machine 10, the detachable portion 74 that stores the nails N can be detached from the housing 12, thereby preventing the striking portion 52 from accidentally shooting the nails N.

[0073] In the work machine 10, the control unit 70 (FIG. 2) controls the impact operation of the impact unit 52 (FIG. 2) in response to information detected by the Hall IC 68 regarding the first magnet 86. In other words, because the presence or absence of the detachable unit 74 attached to the housing 12 is detected in a non-contact manner, progress of wear on the components of the housing 12 and the detachable unit 74 can be suppressed compared to detection using a contact method.

[0074] In the work machine 10, the magazine 76 and the mounting member 92 (Figure 9) are identified using a single Hall IC 68, so it is easier to detect that either the magazine 76 or the mounting member 92 is attached to the housing 12 than in a configuration that uses multiple sensors for detection.

[0075] In the work machine 10, when the Hall IC 68 detects the attachment member 92 (FIG. 9), the control unit 70 (FIG. 2) releases the restriction on the striking operation of the striking unit 52. Because the attachment member 92 is not loaded with nails N, operating the striking unit 52 is unlikely to result in the nails N being fired by mistake. Therefore, the operation of the striking unit 52 is not restricted more than necessary, making it easier to check the operation of the striking unit 52.

[0076] In the work machine 10, the state (position) of the magnet holder 84 and the first magnet 86 changes depending on the remaining number of nails N stored in the detachable portion 74. When the Hall IC 68 determines, based on the detection information of the Hall IC 68, that the first magnet 86 is present and that the remaining number of nails N is equal to or greater than a predetermined number, the control portion 70 permits the striking operation of the striking portion 52. In other words, normal striking operation can be performed.

[0077] On the other hand, if the control unit 70 determines that the first magnet 86 is absent or that the remaining number of nails N is less than a predetermined number, it restricts the striking action of the striking unit 52. This makes it possible to prevent the striking unit 52 from striking nails without hitting them.

[0078] In the work machine 10, when the control unit 70 determines that the detachable unit 74 is attached to the housing 12 while at least one of the trigger 28 (FIG. 2) and the push lever 48 (FIG. 2) is being operated, the control unit 70 restricts the striking operation by the striking unit 52. This prevents a striking operation when there is no nail N in the ejection unit 44 (blank striking), thereby reducing wear and tear on the parts that receive the impact force during the striking operation of the striking unit 52.

[0079] In the work machine 10, if the push lever 48 is mistakenly turned on before the detachable unit 74 is attached to the housing 12, the control unit 70 restricts the striking operation by the striking unit 52. Then, the control unit 70 permits the striking operation by the striking unit 52 after the push lever 48 is turned off and the detachable unit 74 is attached to the housing 12. In this way, even after the push lever 48 has been mistakenly turned on, the striking operation by the striking unit 52 can be performed by attaching the detachable unit 74 to the housing 12 and then turning the push lever 48 on again.

[0080] [Configuration of Second Embodiment] A working machine 100 of a second embodiment will be described. Note that components that are the same as or similar to the components of the working machine 10 (FIG. 1) of the first embodiment will be denoted by the same reference numerals and will not be described again.

[0081] Figure 11 shows a portion of the work machine 100. The work machine 100 differs from the work machine 10 (Figure 1) in that the attachment state of the magazine 76 in the housing 12 is detected by a magnet 102 and a Hall IC 104. The work machine 100 does not include the slide knob 78, coil spring 79, shaft 82, magnet holder 84, or first magnet 86 (all of which are shown in Figure 5).

[0082] As an example, the magnet 102 is attached to the rear end of the magazine body 77 below the center in the vertical direction.

[0083] As an example, the Hall IC 104 is provided above the locking portion 39 at the front end of the housing 12. When the magazine 76 is attached to the housing 12, the Hall IC 104 is fixed in a position aligned with the magnet 102 in the front-to-rear direction. The Hall IC 104 is an example of a sensor that detects the presence or absence of the magnet 102. The Hall IC 104 detects the magnetic strength of the magnet 102 (presence or absence of the magnet 102) and outputs (transmits) a signal corresponding to the magnetic strength to the control unit 70.

[0084] Operation of the Second Embodiment When the magazine 76 is attached to the housing 12, the magnet 102 is positioned so as to face the Hall IC 104 in the vertical direction. The Hall IC 104 detects the magnetism of the magnet 102 and transmits the detection information to the control unit 70. The control unit 70 determines that the magazine 76 is attached to the housing 12 and permits the striking operation of the striking unit 52 (FIG. 2). This allows the striking unit 52 to strike the nail N.

[0085] As shown in Figure 12, when the locking unit 39 is released, the locked unit 77D becomes movable, and the magazine 76 is removed from the housing 12. When the magazine 76 is removed from the housing 12, the magnetic value detected by the Hall IC 104 becomes lower than a predetermined threshold value. Therefore, the control unit 70 determines that the magazine 76 is not attached to the housing 12, and restricts the striking operation of the striking unit 52 (Figure 2). This makes it possible to prevent the striking unit 52 from striking empty shots.

[0086] [Configuration of Third Embodiment] A description will be given of a work machine 110 according to a third embodiment. Note that components that are the same as or similar to the components of the work machine 10 (FIG. 1) and the work machine 100 (FIG. 11) will be designated by the same reference numerals and will not be described again.

[0087] Fig. 13 shows a portion of the work machine 110. The work machine 110 differs from the work machine 100 (Fig. 11) in that the magnet 102 (Fig. 12) and the Hall IC 104 (Fig. 12) are replaced with a supply path 112 and a switching unit 118. In other words, the housing 12 is provided with the supply path 112 and the switching unit 118. Furthermore, the housing 12 is provided with an attachment portion 111 and an insertion portion 113. The rest of the configuration is the same as that of the work machine 100.

[0088] A first terminal 114 and a second terminal 116, which will be described later, are attached to the attachment portion 111. The insertion portion 113 is provided on the attachment portion 111. The insertion portion 113 has a through-hole 113A that passes through the attachment portion 111 in the up-down direction.

[0089] 14, the supply path 112 has a first wiring 112A and a second wiring 112B. The first wiring 112A is connected to the power supply circuit 66 and is electrically connected to the power supply circuit 66. The second wiring 112B is connected to the control unit 70 and is electrically connected to the control unit 70. When the supply path 112 is in an electrically connected state, which will be described later, it supplies power from the battery pack 36 and the power supply circuit 66 to the control unit 70. The supply path 112 is provided with a first terminal 114 and a second terminal 116. The Hall IC 68 detects the remaining amount of nails N.

[0090] <<First Terminal>> As shown in Fig. 15 , the first terminal 114 is provided at the end of the first wiring 112A. When viewed from the left and right, the first terminal 114 functions as a leaf spring contact in which a metal plate is bent at multiple locations. The first terminal 114 has a contact portion 114A that can elastically deform in the up and down direction. The contact portion 114A is located at the lower end of the first terminal 114.

[0091] <<Second Terminal>> The second terminal 116 is provided at an end of the second wiring 112B. When viewed from the left and right, the second terminal 116 functions as a leaf spring contact formed by bending a metal plate at multiple locations. The second terminal 116 is positioned symmetrically to the first terminal 114 in the front-to-rear direction with respect to the switching section 118. The second terminal 116 has a contact portion 116A that is elastically deformable in the up-down direction. The contact portion 116A is located at the lower end of the second terminal 116.

[0092] <Switching Unit> The switching unit 118 is provided so as to be able to switch between a conductive state and a non-conductive state of the supply path 112. In other words, the switching unit 118 is a switch that switches between a conductive state and a non-conductive state of the supply path 112. Specifically, the switching unit 118 has a slide bar 122, a conductive plate 124, and a spring 126.

[0093] <<Slide Bar>> The slide bar 122 is an example of a movable part, and is supported by the housing 12. The slide bar 122 is movable in the vertical direction between a contact position P1 where the first terminal 114 and the second terminal 116 are electrically connected, and a retracted position P2 where the first terminal 114 and the second terminal 116 are not electrically connected. Specifically, the slide bar 122 has a plate portion 122A, a lower shaft portion 122B, and an upper shaft portion 122C.

[0094] The dashed-dotted circle in Figure 13 shows an enlarged view of the slide bar 122 as seen from above. The plate portion 122A has a predetermined thickness in the vertical direction. The plate portion 122A has a cross-shaped outer shape when viewed from the vertical direction, and extends in the front-to-back and left-to-right directions.

[0095] The lower shaft portion 122B extends rearward from the center of the plate portion 122A. The lower shaft portion 122B is formed in a cylindrical shape. The lower end of the lower shaft portion 122B is positioned so as to be able to come into contact with the upper end of the locked portion 77D.

[0096] The upper shaft portion 122C extends upward from the center of the plate portion 122A. The upper shaft portion 122C is formed in a cylindrical shape. The upper shaft portion 122C and the lower shaft portion 122B are positioned on the same central axis line along the vertical direction. The upper shaft portion 122C is inserted into the through-hole 113A.

[0097] <<Conductive Plate>> The conductive plate 124 is attached to the front surface and the left and right side surfaces of the plate portion 122A. When viewed from above, the conductive plate 124 is formed in a U-shape. The conductive plate 124 has a notch cut out in the center in the front-to-rear direction. In other words, the conductive plate 124 is attached to the plate portion 122A while avoiding the upper shaft portion 122C.

[0098] The portion of the conductive plate 124 that is located forward of the upper shaft portion 122C is referred to as a front portion 124A. The front portion 124A is positioned opposite the first terminal portion 114 in the vertical direction. The portion of the conductive plate 124 that is located rearward of the upper shaft portion 122C is referred to as a rear portion 124B. The rear portion 124B is positioned opposite the second terminal portion 116 in the vertical direction.

[0099] <<Spring>> The spring 126 is provided in the housing 12 so as to be elastically deformable in the vertical direction. The upper shaft portion 122C is inserted into the spring 126. The rear end of the spring 126 contacts the front surface of the plate portion 122A. The upper end of the spring 126 contacts the insertion portion 113 (the peripheral portion of the through-hole 113A). As a result, the slide bar 122 is biased downward by the spring 126.

[0100] 15 functions as an interlocking part that causes the switching part 118 to perform a switching operation in accordance with the attachment / detachment of the magazine 76 to / from the housing 12. When the magazine 76 is attached to the housing 12, the locked part 77D causes the switching part 118 to operate so that the supply path 112 is in a conductive state.

[0101] Specifically, when the locked portion 77D is attached to the housing 12, it presses the slide bar 122 (lower shaft portion 122B) upward, thereby moving the conductive plate 124 of the slide bar 122 to the contact position P1.

[0102] When the magazine 76 is removed from the housing 12, the locked portion 77D operates the switching portion 118 to make the supply path 112 non-conductive. Specifically, when the magazine 76 is removed from the housing 12, the locked portion 77D releases the pressing state against the slide bar 122. As a result, the slide bar 122 moves to the retracted position P2 due to the biasing force of the spring 126.

[0103] 13 , when the magazine 76 is attached to the housing 12, the locked portion 77D moves the slide bar 122 upward against the biasing force of the spring 126. As a result, the conductive plate 124 is positioned at the contact position P1 ( FIG. 15 ) and comes into contact with the first terminal 114 and the second terminal 116. In other words, the switching portion 118 places the supply path 112 in a conductive state.

[0104] The control unit 70 starts operating when the supply path 112 is conductive and power is supplied from the power supply circuit 66. This causes the control unit 70 to determine that the magazine 76 is attached to the housing 12 and to permit the striking operation by the striking unit 52 (FIG. 2).

[0105] 16, when the locking by the locking portion 39 is released, the locked portion 77D becomes movable, and the magazine 76 is removed from the housing 12. At this time, the locked portion 77D moves away from the slide bar 122, causing the slide bar 122 to move downward. As a result, the conductive plate 124 is positioned at the retracted position P2 (FIG. 15), and the conductive plate 124 is separated from the first terminal portion 114 and the second terminal portion 116. In other words, the switching portion 118 switches the supply path 112 to a non-conductive state.

[0106] When the supply path 112 is brought into a non-conductive state, the control unit 70 stops receiving power from the power supply circuit 66 (FIG. 14). This causes the control unit 70 to determine that the magazine 76 is not attached to the housing 12, and restricts the striking operation of the striking unit 52 (FIG. 2). This prevents the striking unit 52 from striking empty shots.

[0107] As described above, in the work machine 110, when the magazine 76 is detached from the housing 12, the locked portion 77D operates the switching portion 118, thereby causing the supply path 112 to become non-conductive. As a result, the control portion 70 does not operate and the striking portion 52 does not perform a striking operation, thereby preventing the nail N from being struck empty.

[0108] Furthermore, in the work machine 110, the slide bar 122 is moved (moved in one direction) between the contact position P1 and the retracted position P2, thereby switching the supply path 112 between a conductive state and a non-conductive state, thereby preventing the configuration of the switching unit 118 from becoming complex.

[0109] [Configuration of Fourth Embodiment] A description will be given of a work machine 130 according to a fourth embodiment. Note that components that are the same as or similar to the components of the work machine 110 (FIG. 13) are designated by the same reference numerals as those in FIG. 13, and descriptions thereof will be omitted.

[0110] 17 shows a circuit block diagram of the work machine 130. The work machine 130 differs from the work machine 110 in that the supply path 112 and the switching unit 118 are replaced with a signal path 132 and a signal switching unit 136. The housing 12 is provided with the signal path 132 and the signal switching unit 136. The magazine 76 is provided with a locked portion 77D, which is an example of an interlocking unit.

[0111] <Signal Path> Specifically, the signal path 132 has a first wiring 134, a first terminal unit 114, a signal switching unit 136, a second terminal unit 116, and a second wiring 138. When the signal path 132 is in a conductive state, it returns a signal sent from the control unit 70 to the control unit 70. One end of the first wiring 134 and one end of the second wiring 138 are each connected to the control unit 70.

[0112] <Signal Switching Unit> The signal switching unit 136 can switch between a conductive state and a non-conductive state of the signal path 132. Specifically, the signal switching unit 136 has a slide bar 122, a conductive plate 124, and a spring 126.

[0113] <Locked Portion> The locked portion 77D causes the signal switching portion 136 to perform a switching operation in accordance with the attachment / detachment of the magazine 76 to / from the housing 12. When the magazine 76 is attached to the housing 12, the locked portion 77D operates the signal switching portion 136 (slide bar 122) so that the signal path 132 is in a conductive state.

[0114] Furthermore, when the magazine 76 is removed from the housing 12, the locked portion 77D operates the signal switching portion 136 (slide bar 122) so that the signal path 132 is brought into a non-conductive state.

[0115] When the magazine 76 is attached to the housing 12, the slide bar 122 is pressed upward, causing the conductive plate 124 to come into contact with the first terminal portion 114 and the second terminal portion 116. In other words, the signal switching unit 136 brings the signal path 132 into a conductive state.

[0116] The control unit 70 receives the signal again from the control unit 70 because the signal path 132 is in a conductive state. As a result, the control unit 70 determines that the magazine 76 is attached to the housing 12 and permits the striking operation by the striking unit 52 (FIG. 2).

[0117] On the other hand, when the lock by the locking unit 39 is released, the slide bar 122 receives the elastic force of the spring 126 and moves downward, causing the conductive plate 124 to move away from the first terminal 114 and the second terminal 116. In other words, the signal switching unit 136 switches the signal path 132 to a non-conductive state.

[0118] The control unit 70 cannot receive the transmitted signal due to the non-conductive state of the signal path 132. As a result, the control unit 70 determines that the magazine 76 is not attached to the housing 12, and restricts the striking operation of the striking unit 52 (FIG. 2).

[0119] As described above, in the work machine 130, when the magazine 76 is detached from the housing 12, the signal path 132 is brought into a non-conductive state. As a result, the striking operation by the striking unit 52 is not performed, and therefore, it is possible to prevent the nail N from being struck without being struck.

[0120] [Configuration of Fifth Embodiment] A description will be given of a work machine 140 according to a fifth embodiment. Note that components that are the same as or similar to the components of the work machine 10 (FIG. 1), work machine 100 (FIG. 11), work machine 110 (FIG. 13), and work machine 130 (FIG. 17) will be designated by the same reference numerals and will not be described again.

[0121] Figure 18 shows a portion of a work machine 140. The work machine 140 differs from the work machine 110 (Figure 13) in that the supply path 112 (Figure 14) and the switching unit 118 (Figure 14) are replaced with a supply path 142 and a clip unit 146. The housing 12 is provided with the supply path 142. The magazine 76 is provided with the clip unit 146.

[0122] <Supply Path> The supply path 142 has a first wiring 143 and a second wiring 149. The first wiring 143 is connected to the power supply circuit 66 (FIG. 13) and is electrically connected to the power supply circuit 66. The second wiring 149 is connected to the control unit 70 and is electrically connected to the control unit 70. When the supply path 142 is in an electrically connected state, it supplies power from the battery pack 36 (FIG. 13) and the power supply circuit 66 to the control unit 70. A first terminal 144 is provided on the first wiring 143. A second terminal 148 is provided on the second wiring 149.

[0123] <<First Terminal>> The first terminal 144 is provided on the housing 12. Specifically, the first terminal 144 is provided on the other end of the first wiring 143, and is screwed to the housing 12. The first terminal 144 is formed in a plate shape having a predetermined thickness in the left-right direction.

[0124] <<Second Terminal>> The second terminal 148 is provided on the housing 12. Specifically, the second terminal 148 is provided on the other end of the second wiring 149, and is screwed to the housing 12. The second terminal 148 is formed in a plate shape having a predetermined thickness in the left-right direction.

[0125] <Clip portion> The clip portion 146 is provided on the magazine 76. The clip portion 146 can switch the supply path 142 between a conductive state and a non-conductive state in accordance with the attachment and detachment of the magazine 76 to and from the housing 12. In other words, the clip portion 146 is a switch that switches the supply path 142 between a conductive state and a non-conductive state.

[0126] When the magazine 76 is attached to the housing 12, the clip portion 146 brings the supply path 142 into a conductive state. When the magazine 76 is detached from the housing 12, the clip portion 146 brings the supply path 142 into a non-conductive state.

[0127] 19 , before contacting the first terminal 144 and the second terminal 148, the clip portion 146 is positioned at a distance from the first terminal 144 and the second terminal 148 in the front-to-rear direction. The shape of the lower end of the clip portion 146 as viewed from the left side is shown in region S1. The shape of the lower end of the clip portion 146 as viewed from below is shown in region S2.

[0128] The clip portion 146 has a U-shaped outer shape when viewed from above and below. The rear ends (tip ends) of the clip portion 146 are bent toward each other in the left-right direction. As shown by the two-dot chain line, when the clip portion 146 is moved from the front to the rear, the front end of the first terminal portion 144 and the front end of the second terminal portion 148 come into contact with the clip portion 146. The front end of the first terminal portion 144 and the front end of the second terminal portion 148 are held in a sandwiched state by the tip end of the clip portion 146. This places the supply path 142 in a conductive state.

[0129] 18 , when the magazine 76 is attached to the housing 12, the clip portion 146 is in contact with the first terminal portion 144 and the second terminal portion 148. In other words, the clip portion 146 puts the supply path 142 in a conductive state.

[0130] The control unit 70 starts operating when the supply path 142 is in a conductive state, which causes the control unit 70 to determine that the magazine 76 is attached to the housing 12 and to permit the striking operation by the striking unit 52 (FIG. 2).

[0131] 20 , when the locking by the locking portion 39 is released, the locked portion 77D becomes movable, and the magazine 76 is removed from the housing 12. At this time, the clip portion 146 separates from the first terminal portion 144 and the second terminal portion 148. In other words, the clip portion 146 switches the supply path 142 to a non-conductive state.

[0132] When the supply path 142 is brought into a non-conductive state, the supply of power from the power supply circuit 66 (FIG. 14) to the control unit 70 is stopped. As a result, the control unit 70 determines that the magazine 76 is not attached to the housing 12, and restricts the striking operation of the striking unit 52 (FIG. 2). This prevents the striking unit 52 from striking empty shots.

[0133] As described above, in the work machine 140, when the magazine 76 is detached from the housing 12, the supply path 142 is brought into a non-conductive state. This prevents the striking unit 52 from performing a striking operation, thereby preventing the nail N from being struck empty.

[0134] Furthermore, in the work machine 140, the tip of the clip portion 146 functions as a leaf spring. As a result, when an operation to detach the magazine 76 from the housing 12 is performed, the clip portion 146 can easily come out of the first terminal portion 144 and the second terminal portion 148, making it easier to bring the supply path 142 into a non-conductive state.

[0135] [Configuration of Sixth Embodiment] A description will be given of a work machine 150 of a sixth embodiment. Note that components that are the same as or similar to the components of the work machine 10 ( FIG. 1 ), work machine 100 ( FIG. 11 ), work machine 110 ( FIG. 13 ), work machine 130 ( FIG. 17 ), and work machine 140 ( FIG. 18 ) will be designated by the same reference numerals and will not be described again.

[0136] A work machine 150 is shown in Figure 21. The magazine 76 of the work machine 150 has a magazine base 151 attached to the ejection unit 44 so as to be immovable relative to the ejection unit 44, a magazine cover 152 attached to the magazine base 151 so as to be movable in the front-to-rear direction relative to the magazine base 151 and the ejection unit 44, and a feeder 88 (see Figure 22) attached to the magazine cover 152 so as to be movable in the up-and-down direction relative to the magazine cover 152. The feeder 88 is biased upward relative to the magazine cover 152 by a spring (not shown), one end of which is connected to the feeder 88 and the other end of which is connected ... biasing force of the spring presses the nails N (see Figure 22) upward toward the ejection unit 44. However, the magazine cover 152 abuts against the feeder 88, thereby limiting the upward movement range of the feeder 88. When the magazine cover 152 moves downward, the movement range of the feeder 88 also moves downward. In other words, when the magazine cover 152 moves downward, the feeder 88 can no longer press the nails N.

[0137] In Figure 21, the magazine cover 152 is in an upper position and is restricted from moving downward by a latch (not shown). In other words, in Figure 21, the magazine cover 152 is in a closed position. When the magazine cover 152 is in the closed position, the feeder 88 receives the biasing force of a spring (not shown) and presses the nails N upward toward the ejection section 44. In other words, the magazine 76 shown in Figure 21 is in a biased state that generates a biasing force on the nails N. Note that when the magazine cover 152 is in the closed position, the nails N and the feeder 88 are sandwiched between the magazine cover 152 and the magazine base 151 in the left-right direction, and therefore the nails N and the feeder 88 cannot be seen in Figure 21.

[0138] In Fig. 22, the magazine cover 152 is in a downward position. In other words, in Fig. 22, the magazine cover 152 is in an open position. At this time, the movement range of the feeder 88 has also moved downward compared to Fig. 21, and the feeder 88 cannot press the nails N against the ejection section 44. In other words, the magazine 76 shown in Fig. 22 is in a non-biased state in which no biasing force is generated on the nails N.

[0139] Here, the magazine cover 152 has a first magnet 86, and the ejection unit 44 has a Hall IC 68. As shown in FIG. 21 , when the magazine cover 152 is in the closed position and the magazine 76 is in the biased state, the first magnet 86 is positioned close to the Hall IC 68, and the Hall IC 68 detects the first magnet 86. When the Hall IC 68 detects the first magnet 86, the control unit 70 permits the impact operation by the impact unit 52. On the other hand, as shown in FIG. 22 , when the magazine cover 152 is in the open position and the magazine 76 is in the non-biased state, the first magnet 86 is positioned away from the Hall IC 68, and the Hall IC 68 does not detect the first magnet 86. When the Hall IC 68 does not detect the first magnet 86, the control unit 70 restricts the impact operation by the impact unit 52.

[0140] As described above, in the work machine 150, when the magazine cover 152 is in the open position and the magazine 76 is in the non-biased state, the control unit 70 restricts the striking operation by the striking unit 52. This makes it possible to prevent the nail N from being struck empty.

[0141] [Modifications] The present invention is not limited to the above-described first, second, third, fourth, and fifth embodiments, and various modifications are possible without departing from the spirit of the present invention. Modifications will be described below.

[0142] The magnet holder 84 is not limited to a rotating type, but may be a type that slides in the left and right direction.

[0143] The control unit 70 of the work machine 10 does not have to release the restriction on the striking operation when the Hall IC 68 detects the attachment member 92. Furthermore, the control unit 70 of the work machine 10 may use multiple Hall ICs 68 to separately determine the presence or absence of the first magnet 86 and the remaining amount of nails N, and then permit or restrict the striking operation of the striking unit 52.

[0144] The work machine 10 may have a mechanism that prevents the detachable part 74 from being attached to the housing 12 when the trigger 28 or the push lever 48 is operated. Only the push lever 48 or only the trigger 28 may be selected as the operating part.

[0145] The work machine 110 may have a configuration in which the conductive plate 124 is attached to the locked portion 77D and the slide bar 122 is not required. The first terminal portion 114 and the second terminal portion 116 may be configured as movable members that can contact and separate from each other. For example, when the detachable portion 74 is not present, the first terminal portion 114 and the second terminal portion 116 may be electrically connected, and when the detachable portion 74 is attached, the locked portion 77D may contact at least one of the first terminal portion 114 and the second terminal portion 116 to interrupt the electrical connection. In this way, the work machine is not limited to a type in which the presence or absence of the detachable portion 74 is determined to be present when the detachable portion 74 is in a conductive state, but may also be a type in which the presence or absence of the detachable portion is determined to be present when the detachable portion 74 is in a non-conductive state.

[0146] 10: Work machine, 12: Housing, 14: Cylinder case, 16: Handle, 18: Motor case, 19: Pressure accumulator container, 20: Main circuit section, 21: Pressure chamber, 22: Battery mounting section, 24: Mounting section, 26: Cylinder, 28: Trigger, 29: Trigger switch, 32: Motor, 33: Inverter circuit, 34: Gear case, 36: Battery pack, 38: Operating lever, 39: Locking section, 42: Engaged section, 44: Injection section, 46: Injection passage, 48: Push lever, 49: Push lever switch, 52: Striking section, 54: Piston, 56: Driver blade, 58: Bang support portion, 59: shaft, 61: lock shaft, 62: bumper, 64: blade guide, 66: power supply circuit, 68: Hall IC, 70: control portion, 74: attachment / detachment portion, 76: magazine, 77: magazine body, 77A: left side wall, 77B: rib, 77C: engagement portion, 77D: locked portion, 78: slide knob, 78A: front wall, 78B: rear wall, 78C: bottom wall, 78D: upper wall, 78E: protrusion, 78F: contact surface, 78G: inclined surface, 79: coil spring, 82: shaft, 84: magnet holder, 84A: connection portion, 84B: lower arm portion, 84C: upper arm portion, 84D: Curved surface, 85: magnet, 86: first magnet, 88: feeder, 88A: feeder body, 88B: first knob, 88C: arm, 88D: second knob, 88E: protrusion, 92: mounting member, 94: cover, 98: second magnet, 99: opening, 100: working machine, 102: magnet, 104: Hall IC, 110: working machine, 111: mounting portion, 112: supply path, 112A: first wiring, 112B: second wiring, 113: insertion portion, 113A: through hole, 114: first terminal portion, 114A: contact portion, 116: second terminal portion, 116A: contact portion, 118: switching portion, 122: Slide bar, 122A: plate portion, 122B: lower shaft portion, 122C: upper shaft portion, 124: conductive plate, 124A: front portion, 124B: rear portion, 126: spring, 130: working machine, 132: signal path, 134: first wiring, 136: signal switching portion, 138: second wiring, 139: second wiring, 140: working machine, 142: supply path, 143: first wiring, 144: first terminal portion, 146: clip portion, 148: second terminal portion, 149: second wiring, G: mating member, M1: rotation axis, N: nail, P1: contact position, P2: retracted position, S1: area, S2: area, T1: terminal, T2: terminal, T3: terminal,T4: terminal, θ: angle,

Claims

1. A working machine comprising: an injection unit that injects a stopper; a striking unit that strikes the stopper positioned in the injection unit; a control unit that controls the striking operation by the striking unit; a main body unit having the injection unit, the striking unit, and the control unit; and a detachable unit that is detachably provided with respect to the main body unit and positions the stopper in the injection unit when attached to the main body unit, wherein the control unit restricts the striking operation by the striking unit when the detachable unit is not attached to the main body unit.

2. The working machine according to claim 1, wherein the detachable unit includes a magazine that houses the stopper.

3. The main body unit is provided with a supply path that supplies power from a power source to the control unit, and a switching unit that can switch between a conductive state and a non-conductive state of the supply path. The magazine is provided with an interlocking unit that causes the switching unit to perform a switching operation in accordance with the attachment / detachment operation of the magazine with respect to the main body unit. When the magazine is attached to the main body unit, the interlocking unit operates the switching unit so that the supply path becomes the conductive state. When the magazine is detached from the main body unit, the interlocking unit operates the switching unit so that the supply path becomes the non-conductive state. The working machine according to claim 2.

4. The supply path is provided with a first terminal portion and a second terminal portion. The switching unit has a movable portion that is movable between a contact position where the first terminal portion and the second terminal portion are electrically connected and a retracted position where the electrical connection between the first terminal portion and the second terminal portion is interrupted. The interlocking unit moves the movable portion to the contact position when the magazine is attached to the main body unit, and enables the movable portion to be moved to the retracted position when the magazine is detached from the main body unit. The working machine according to claim 3.

5. The main body is provided with a signal path for returning the signal sent from the control unit to the control unit, and a signal switching unit capable of switching between a conductive state and a non-conductive state of the signal path. The magazine is provided with an interlocking unit for causing the signal switching unit to perform a switching operation in accordance with the attachment / detachment operation of the magazine with respect to the main body. When the magazine is attached to the main body, the interlocking unit operates the signal switching unit so that the signal path becomes the conductive state. When the magazine is detached from the main body, the interlocking unit operates the signal switching unit so that the signal path becomes the non-conductive state. The working machine according to claim 2.

6. The main body is provided with a supply path for supplying power from a power source to the control unit. The magazine is provided with a switching unit capable of switching between a conductive state and a non-conductive state of the supply path in accordance with the attachment / detachment operation of the magazine with respect to the main body. When the magazine is attached to the main body, the switching unit sets the supply path to the conductive state. When the magazine is detached from the main body, the switching unit sets the supply path to the non-conductive state. The working machine according to claim 2.

7. The attachment / detachment unit is provided with a detected part. The main body is provided with a sensor for detecting the state of the detected part and transmitting a signal of detection information to the control unit. The control unit controls the striking operation by the striking part according to the detection information of the sensor. The working machine according to claim 1.

8. The attachment / detachment unit includes a magazine for accommodating the stopper and a mounting member for not accommodating the stopper. The magazine and the mounting member are each detachably provided to the main body independently. The sensor can distinguish the detected part of the magazine from the detected part of the mounting member. The working machine according to claim 7.

9. After restricting the striking operation of the striking part, when the sensor detects the mounting member, the control unit releases the restriction on the striking operation of the striking part. The working machine according to claim 8.

10. The detected part changes its state according to the remaining amount of the fastener accommodated in the detachable part, the sensor can detect the presence or absence of the detected part and the remaining amount of the fastener according to the change in the state of the detected part, and the control part, based on the detection information of the sensor, when determining that the detected part is present and the remaining amount of the fastener is equal to or more than a predetermined number, permits the striking operation of the striking part, and when determining that the detected part is absent or the remaining amount of the fastener is less than the predetermined number, restricts the striking operation of the striking part. The working machine according to claim 7.

11. An operating part is provided which causes the striking part to perform a striking operation when operated, and the control part restricts the striking operation by the striking part when determining, based on the detection information of the detected part, that the detachable part is attached to the main body part while the operating part is being operated. The working machine according to claim 7.

12. The operating part is a push lever whose on state and off state are switched according to the presence or absence of contact with the material into which the fastener is driven, and the control part permits the striking operation by the striking part when the push lever changes from the off state to the on state after determining that the detachable part is attached to the main body part while the push lever is in the on state. The working machine according to claim 11.

13. A working machine comprising: an injection part for injecting a fastener; a striking part for striking the fastener located in the injection part; a control part for controlling the striking operation by the striking part; a main body part having the injection part, the striking part and the control part; and a magazine capable of biasing a plurality of the fasteners toward the injection part and capable of being in a biasing state that generates a biasing force on the fasteners and a non - biasing state that does not generate the biasing force, wherein the control part restricts the striking operation by the striking part when the magazine is in the non - biasing state.

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