Work machine

Abstract

To provide a work machine which achieves improvement of convenience.SOLUTION: A work machine includes: an ejection unit 42 which is supplied with a nail N serving as a fastener; a striking unit 48 which strikes the nail N supplied to the ejection unit 42; a magazine unit 74 which stores the nail N wound in a roll form; a control unit; a supply unit which is operated by the control unit to supply the nail N from the magazine unit 74 to the ejection unit 42; and a detection unit 230 which may detect the nail N which may be supplied from the magazine unit 74 to the ejection unit 42. The detection unit 230 is capable of detecting the nail N even when the supply unit is not operated.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Conventionally, a nail gun is known as an example of a work machine that supplies nails, which are fasteners stored in a magazine, to an ejection section and then strikes the nails. Patent Document 1 discloses a work machine in which fasteners stored in a magazine in a rolled state are supplied to an ejection section by a supply section and then struck by an impact section. In this work machine, the remaining amount of fasteners in the magazine can be determined by detecting the load on the supply section when the fasteners are supplied to the ejection section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-72885 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the work machine of Patent Document 1, the remaining amount of fasteners cannot be determined unless the supply unit is driven. Therefore, in a configuration in which the supply unit is driven after striking, if the power is turned on when the remaining amount of fasteners is zero, striking will be performed before determining whether or not a fastener is present, resulting in a blank strike. If a blank strike occurs, the durability of the work machine may be impaired, and its usability will be reduced. [Means for solving the problem]

[0005] A working machine according to one embodiment includes an ejection unit to which fasteners are supplied, an impact unit that impacts the fasteners supplied to the ejection unit, a magazine unit that stores the fasteners wound in a roll, a control unit, a supply unit that is operated by the control unit and supplies the fasteners from the magazine unit to the ejection unit, and a detection unit that can detect the fasteners that can be supplied from the magazine unit to the ejection unit. The detection unit can detect the fasteners even when the supply unit is not operating.

[0006] A work machine according to one embodiment includes an ejector to which fasteners are supplied, an impactor that moves to strike the fasteners supplied to the ejector, a magazine that stores the fasteners wound in a roll, a control unit, and a supply unit that is operated by the control unit and supplies the fasteners from the magazine to the ejector. The magazine has a lid that is opened and closed when inserting or removing the fasteners from the magazine. The control unit is capable of recognizing that the magazine does not contain any fasteners after the lid is opened and closed and before the impactor performs its impact operation. [Effects of the Invention]

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

[0008] [Figure 1] 1 is a side view showing the appearance of a work machine according to a first embodiment. [Figure 2] FIG. 2 is a circuit block diagram illustrating a circuit configuration of the work machine. [Figure 3] FIG. [Figure 4] 10A and 10B are diagrams illustrating a configuration for supplying a fastener to an injection unit. [Figure 5] 2 is a perspective view showing an emission section and a structure provided in the vicinity of the emission section according to the first embodiment. FIG. [Figure 6] 2 is a perspective view showing an emission section and a structure provided in the vicinity of the emission section according to the first embodiment. FIG. [Figure 7]1 is a perspective view showing the injection section and a structure provided in the vicinity of the injection section according to the first embodiment, showing a state after a driving operation. FIG. [Figure 8] 1 is a perspective view showing the ejection section and a structure provided in the vicinity of the ejection section in the first embodiment, showing a state in which the impact section is moving from the bottom dead center to the standby position. FIG. [Figure 9] 1 is a perspective view showing the ejection section and a structure provided in the vicinity of the ejection section in the first embodiment, showing a state in which the striking section is positioned above the upper end of the fastener. FIG. [Figure 10] 1 is a perspective view showing the injection section and a structure provided in the vicinity of the injection section according to the first embodiment, showing a state after a driving operation. FIG. [Figure 11] 1 is a perspective view showing the ejection section and a structure provided in the vicinity of the ejection section in the first embodiment, showing a state in which the impact section is moving from the bottom dead center to the standby position. FIG. [Figure 12] 1 is a perspective view showing the ejection section and a structure provided in the vicinity of the ejection section in the first embodiment, showing a state in which the striking section is positioned above the upper end of the fastener. FIG. [Figure 13] 1 is a perspective view showing the ejection unit and a structure provided in the vicinity of the ejection unit according to the first embodiment, illustrating a state in which no stopper is present within the detection range. FIG. [Figure 14] 1 is a perspective view showing the ejection unit and a structure provided in the vicinity of the ejection unit according to the first embodiment, illustrating a state in which no stopper is present within the detection range. FIG. [Figure 15] 1 is a cross-sectional view showing the ejection section and a structure provided in the vicinity of the ejection section in the first embodiment, showing a state in which the stopper and the striking section are in contact with each other. [Figure 16] 10 is a timing chart showing the timing of the driving operation by the striking unit and the nail supply operation by the supply unit. [Figure 17] FIG. 10 is a side view showing an emission section and a structure provided in the vicinity of the emission section according to the second embodiment. [Figure 18] FIG. 10 is a perspective view showing an emission section and a structure provided in the vicinity of the emission section according to a second embodiment. [Figure 19] FIG. 18 is a cross-sectional view taken along line AA in FIG. [Figure 20] 20 is a cross-sectional view similar to FIG. 19 showing the injection section and the structure provided in the vicinity of the injection section according to the second embodiment, showing the state after the driving operation. FIG. [Figure 21] 20 is a perspective view similar to FIG. 19 showing the ejection section and a structure provided in the vicinity of the ejection section according to the second embodiment, illustrating a state in which a fastener is being supplied. FIG. [Figure 22] 20 is a perspective view similar to FIG. 19 showing the injection section and the structure provided in the vicinity of the injection section according to the second embodiment, showing the state after the fastener has been supplied. FIG. [Figure 23] 20 is a cross-sectional view similar to FIG. 19 showing the injection section and the structure provided in the vicinity of the injection section according to the second embodiment, showing the state after the driving operation. FIG. [Figure 24] 20 is a perspective view similar to FIG. 19 showing the ejection section and a structure provided in the vicinity of the ejection section according to the second embodiment, illustrating a state in which a fastener is being supplied. FIG. [Figure 25] 20 is a perspective view similar to FIG. 19 showing the injection section and the structure provided in the vicinity of the injection section according to the second embodiment, showing the state after the fastener has been supplied. FIG. [Figure 26] 10 is a perspective view showing an ejection section of a work machine according to a third embodiment and a structure provided in the vicinity of the ejection section. FIG. [Figure 27] 10 is a perspective view showing an ejection section of a work machine according to a third embodiment and a structure provided in the vicinity of the ejection section. FIG. [Figure 28] 10 is a timing chart showing the timing of the driving operation by the striking unit and the nail supply operation by the supply unit in the nail holding mode. [Figure 29] 10 is a flowchart illustrating a processing procedure for a nail supply operation by a work machine according to a third embodiment. [Figure 30] 10 is a flowchart illustrating a processing procedure for a nail supply operation by a work machine according to a third embodiment. [Figure 31] FIG. 10 is a cross-sectional view showing an emission section and a structure provided in the vicinity of the emission section in a comparative example. [Figure 32] FIG. 10 is a cross-sectional view showing an emission section and a structure provided in the vicinity of the emission section in a comparative example. [Figure 33] FIG. 10 is a cross-sectional view showing an emission section and a structure provided in the vicinity of the emission section in a comparative example. [Figure 34] FIG. 10 is a cross-sectional view showing an emission section and a structure provided in the vicinity of the emission section in a comparative example. [Figure 35] FIG. 10 is a cross-sectional view showing an emission section and a structure provided in the vicinity of the emission section in a comparative example. [Figure 36] FIG. 10 is a cross-sectional view showing an emission section and a structure provided in the vicinity of the emission section in a comparative example. [Figure 37] FIG. 10 is a cross-sectional view showing the ejection section and a structure provided in the vicinity of the ejection section in the third embodiment, showing the state when the last nail is being fed. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment A working machine according to a first embodiment will be described with reference to the drawings.

[0010] FIG. 1 is a side view of a work machine 10 according to a first embodiment. FIG. 2 is a circuit block diagram of the work machine 10. The work machine 10 is, for example, an electric nail gun. In the work machine 10, when predetermined conditions are met, a nail N (see FIGS. 4, 15, etc.), which is an example of a fastener, is struck by a striking unit 48, which will be described later. In this case, the nail N is ejected from an ejection unit 42, which will be described later, and driven into a target material G.

[0011] In the following description, the direction in which the striking portion 48 strikes the nail N is referred to as the up-down direction. The striking portion 48 strikes the nail N downward in the up-down direction. Directions perpendicular to the up-down direction are referred to as the front-rear direction and the left-right direction. The front-rear direction and the left-right direction are perpendicular to each other. In the following description, the up-down direction may be referred to as the first direction.

[0012] <Overall structure> As shown in Figures 1 and 2, the work machine 10 has a housing 12, an impact biasing unit 32, an ejection unit 42, an impact unit 48, a drive unit 56, a lifting unit 66, a magazine unit 74, a supply unit 70, a detection unit 230, and a control unit 130.

[0013] <Housing 12> The housing 12 is an outer shell element of the work implement 10. 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 implement 10 are housed inside the housing 12.

[0014] The housing 12 has a cylinder case 13, a motor case 14, a handle 15, and an attachment portion 16. The cylinder case 13 is cylindrical and extends in the vertical direction. A striking portion 48 is housed inside the cylinder case 13. The motor case 14 extends rearward from the lower portion of the cylinder case 13 in the front-to-rear direction. The motor case 14 houses an electric motor 58 and a gear case 62 of a drive portion 56, which will be described later.

[0015] The handle 15 extends rearward from the center of the cylinder case 13 in the front-to-rear direction. The handle 15 is the part of the housing 12 that the operator grasps. The handle 15 is provided with a trigger 19. The trigger 19 is an operating part that is operated by the operator when driving in the nail N. When the operator operates the trigger 19, an ON signal or OFF signal is sent from the trigger switch 191 to the control unit 130.

[0016] The mounting portion 16 straddles the rear end of the motor case 14 and the rear end of the handle 15. A battery pack 28 is detachably attached to the mounting portion 16. A control unit 130 is also housed inside the mounting portion 16.

[0017] <Impact biasing section 32> The impact biasing portion 32 biases the impact portion 48 downward (toward the injection portion 42), which is one side in the vertical direction (i.e., the first direction). The impact biasing portion 32 is composed of a cylinder 36, a piston chamber 37, a pressure accumulator container 38, etc. A pressure accumulator chamber 38A is formed inside the pressure accumulator container 38. The impact biasing portion 32 biases the impact portion 48 downward by the pressure of the compressed air in the pressure accumulator chamber 38A.

[0018] The cylinder 36 is provided inside the cylinder case 13. The pressure accumulator container 38 is provided in the upper part of the interior of the cylinder case 13. A pressure accumulator chamber 38A formed by the pressure accumulator container 38 is in communication with the piston chamber 37. The piston chamber 37 and the pressure accumulator chamber 38A are filled with compressed air, an example of high-pressure gas. A damper 39 is provided below the cylinder 36. If the pressure in the pressure accumulator chamber 38A drops, air can be sent into the pressure accumulator chamber 38A to increase the pressure in the pressure accumulator chamber 38A to a predetermined pressure.

[0019] The damper 39 is a member made of, for example, rubber or urethane. When a piston 52 of the striking unit 48 (described later) reaches the bottom dead center, the damper 39 comes into contact with the piston 52. This prevents the piston 52 from colliding with the cylinder 36.

[0020] <Injection part 42> The ejection section 42 is located below the cylinder case 13. The ejection section 42 extends downward from the lower end of the cylinder 36 in the vertical direction. An ejection port 46 is provided inside the ejection section 42. An ejection end 47 is provided at the lower end of the ejection port 46. Nails N are supplied one by one from the magazine section 74 to the ejection port 46 by the supply section 70, which will be described later, and are supported within the ejection port 46. In other words, the nails N, which are fasteners, are supplied to the ejection section 42.

[0021] The ejection unit 42 is provided with a push lever 44. The push lever 44 is held by the ejection unit 42 so as to be movable in the up and down direction. The push lever 44 is also biased downward by a spring (not shown). When the push lever 44 is pressed against the target material G, it moves upward against the biasing force of the spring.

[0022] <Striking section 48> 3 is an external view of the striking unit 48 and a lifting unit 66, which will be described later. The striking unit 48 strikes the nail N, which has been supplied to and supported by the ejection unit 42, toward a target material G. The striking unit 48 has a piston 52 and a driver blade 54.

[0023] <Piston 52> The piston 52 is accommodated inside the cylinder 36 so as to be able to reciprocate up and down. That is, the piston 52 is provided in the cylinder 36 so as to be able to reciprocate between top dead center and bottom dead center along the axial direction of the cylinder 36. The piston 52 is also biased downward in the up and down direction by pressure received from the pressure accumulator chamber 38A. The piston 52 defines the interior of the cylinder 36, thereby defining a piston chamber 37. Therefore, the volume of the piston chamber 37 increases and decreases as the piston 52 reciprocates. A seal member (not shown) is provided on the outer peripheral surface of the piston 52. A driver blade 54 is connected to the underside of the piston 52.

[0024] <Driver Blade 54> The driver blade 54 is, for example, a plate-shaped member made of metal. The driver blade 54 extends downward in the vertical direction from the underside of the piston 52. The driver blade 54 is capable of vertically reciprocating within the cylinder 36 together with the piston 52. This vertical reciprocating motion causes the driver blade 54 to pass vertically through the injection port 46. The driver blade 54 moves downward within the injection port 46 and strikes downward the heads Na (see FIG. 15) of the nails N successively supplied to the injection port 46.

[0025] A plurality of racks 55 are disposed in the center of the driver blade 54. The driver blade 54 moves upward in the vertical direction by the driving force of an electric motor 58 (described later) via a lifting portion 66 (described later) that engages with the racks 55. The downward movement of the driver blade 54 in the vertical direction (first direction) is referred to as "downward." The upward movement of the driver blade 54 in the vertical direction (first direction) is referred to as "upward." Although FIG. 3 shows a case where nine racks 55 are disposed, the number of racks 55 is not limited to the illustrated example.

[0026] <Driver 56> 1 drives the striking unit 48. The striking unit 56 has an electric motor 58 and a gear case 62. The operation of the striking unit 56 is controlled by a control unit 130, which will be described later. The striking unit 48 is operated by receiving power from the battery pack 28, and is capable of moving the striking unit 48 upward against the biasing force of the striking biasing unit 32.

[0027] The electric motor 58 is housed in the motor case 14. The electric motor 58 is, for example, a brushless motor having a rotor and a stator. The electric motor 58 receives a supply of electric power from the battery pack 28 and rotates.

[0028] The gear case 62 is provided in front of the electric motor 58 inside the motor case 14. A reduction mechanism having an input element, an output element, and multiple sets of planetary gear mechanisms is provided inside the gear case 62. The input element of the reduction mechanism is connected to the rotating shaft of the electric motor 58 (i.e., the rotor 58B), and the input element is rotatably supported by a bearing. The rotational force of the output element of the reduction mechanism inside the gear case 62 is transmitted to the lifting part 66.

[0029] <Lifting part 66> The lifting unit 66 rotates by receiving a driving force from the electric motor 58, converts the rotational force of the electric motor 58 into a moving force along the up-and-down direction (first direction), and transmits the moving force to the driver blade 54. As shown in FIG. 3, the lifting unit 66 has a pinwheel 68 and a pinion pin 72. The pinwheel 68 is provided so as to be rotatable about the same central axis as the rotational axis of the electric motor 58. The pinwheel 68 rotates in the R1 direction or the R2 direction shown in FIG. 3.

[0030] A plurality of pinion pins 72 are provided on the pinwheel 68. Although FIG. 3 shows a case where nine pinion pins 72 are provided, the number of pinion pins 72 is not limited to the illustrated example. The pinion pins 72 are provided at intervals within a predetermined angular range in the rotational direction of the pinwheel 68. The pinion pins 72 can be engaged and disengaged with the rack 55 on a one-to-one basis. When at least one pinion pin 72 is engaged with the rack 55, the rotational force of the pinwheel 68 is transmitted to the driver blade 54. When all of the pinion pins 72 are disengaged from the rack 55, the rotational force of the pinwheel 68 is not transmitted to the driver blade 54.

[0031] <Battery Pack 28> 1, battery pack 28 is detachably attached to mounting portion 16 and is a DC power supply that supplies power to electric motor 58 and the like. Battery pack 28 has a housing case and a plurality of battery cells housed in the housing case. The battery cells are secondary batteries that can be charged and discharged, and any of lithium-ion batteries, nickel-metal hydride batteries, lithium-ion polymer batteries, and nickel-cadmium batteries can be used.

[0032] <Control unit 130> The control unit 130 is, for example, a microcomputer having an input port, an output port, an arithmetic processing unit, and a storage unit. The control unit 130 is electrically connected to the trigger switch 191, the push switch 162, a detection unit 230 (described later), and the like via wiring. The control unit 130 controls the driving of the electric motor 58 in response to the operation of the trigger 19 and the pushing operation of the push lever 44 by the operator. Furthermore, the control unit 130 can obtain information regarding the remaining number of nails N housed in the magazine unit 74 based on the detection result of the detection unit 230 (described later), and controls the operation of the electric motor 58 (described later) based on the information regarding the remaining number of nails N housed in the magazine unit 74.

[0033] <Magazine Section 74> FIG. 4 is a diagram illustrating a configuration for supplying nails N, which are fasteners, to the ejection unit 42. Specifically, FIG. 4 is a diagram illustrating a part of the magazine unit 74 and the supply unit 70, which will be described later, as viewed from above. The magazine unit 74 shown in FIG. 1 is attached to the lower part of the housing 12. In other words, the magazine unit 74 is supported by the housing 12. As shown in FIGS. 1 and 4, the magazine unit 74 has a hollow drum unit 75, a guide unit 76, and a lid unit 78. A plurality of nails N are stored inside the drum unit 75 in a rolled state. The plurality of nails N are connected by a connecting unit M, such as a wire.

[0034] The guide portion 76 extends forward from the drum portion 75 and is connected to the ejection portion 42. Specifically, the guide portion 76 extends along the K0 direction, which intersects with the left-right and up-down directions. Some of the multiple nails N are supported in the guide portion 76 with their axial direction perpendicular to the K0 direction, and are lined up along the K0 direction. The multiple nails N are moved along the K0 direction and supplied to the ejection portion 42. In the following description, the K0 direction will be referred to as the supply direction K0.

[0035] The lid portion 78 is provided opposite the guide portion 76 in the left-right direction. A supply path 82 is provided between the lid portion 78 and the guide portion 76. The supply path 82 extends in the supply direction K0 toward the injection port 46. The multiple nails N wound in a roll in the drum portion 75 are aligned in a line in the supply direction K0 by the supply path 82 and fed one by one into the injection port 46. In other words, the supply path 82 is a passage provided in the magazine portion 74 that lines up the multiple nails N, which are fasteners, and supplies them to the injection portion 42.

[0036] The lid portion 78 is provided so as to be rotatable in the R3 direction around a rotation shaft 84. The rotation shaft 84 is provided in the injection portion 42 and extends in the vertical direction. The supply path 82 can be opened and closed by rotating the lid portion 78, and an operator can set nails N inside the drum portion 75 or remove the nails N from inside the drum portion 75 by opening the supply path 82. In other words, the lid portion 78 is opened and closed when inserting or removing the nails N into or from the magazine portion 74. The lid portion 78 is provided with a claw member 86 and a spring 88.

[0037] The claw member 86 has a base 86A, a plate 86B, and a claw 86C. The base 86A rotates around a rotation shaft 89 that extends in the vertical direction. The plate 86B extends forward from the base 86A. The plate 86B is biased toward the supply path 82 by a spring 88. The claw 86C is a protrusion that protrudes from the plate 86B toward the supply path 82.

[0038] <Supply section 70> The supply unit 70 includes a feeder 92 , a supply biasing unit 126 , and a supply driving unit 120 .

[0039] <Feeder 92> The feeder 92 is a feeding member that moves toward the ejection unit 42 along the feeding direction K0, thereby feeding the nails N stored in the magazine unit 74 to the ejection unit 42. The feeder 92 performs linear motion along the feeding direction K0.

[0040] The feeder 92 has a movable member 94, a feeding member 96, and a spring 98. The movable member 94 has a fixed portion 94A and a shaft portion 94C. The fixed portion 94A is fixed to the plunger 124 of the supply drive unit 120. The fixed portion 94A is capable of reciprocating in the supply direction K0 in association with the movement of the plunger 124. The shaft portion 94C is a rod-shaped member that extends in a direction perpendicular to the supply direction K0.

[0041] The feeding member 96 is provided rotatably around the shaft 94C. The feeding member 96 has a first claw 96A and a second claw 96B. The first claw 96A and the second claw 96B protrude into the supply path 82. The first claw 96A feeds the leading nail N to the ejection unit 42. The second claw 96B feeds the second nail N toward the ejection unit 42.

[0042] The spring 98 is a torsion spring and is wound around the shaft portion 94 C. The spring 98 biases the feeding member 96 toward the supply path 82 .

[0043] <Supply drive unit 120> The supply drive unit 120 is fixed to the right side of the guide unit 76. The supply drive unit 120 is controlled by the control unit 130 to control the movement of the feeder 92 along the supply direction K0. That is, the supply drive unit 120 is controlled by the control unit 130 to move and regulate the movement of the feeder 92 along the supply direction K0.

[0044] The supply drive unit 120 has a solenoid 122, a plunger 124, and a supply biasing unit 126. The solenoid 122 has a bobbin, a coil provided inside the bobbin, and the like. The plunger 124 is fixed (connected) to the feeder 92. When current is applied to the solenoid 122, the solenoid 122 can move the feeder 92 in the supply direction K0 toward the side opposite the injection unit 42. In other words, the supply drive unit 120 can drive the feeder 92 so as to bias it toward the side opposite the injection unit 42.

[0045] <Supply biasing section 126> The supply biasing portion 126 is a biasing member such as a coil spring. The plunger 124 is inserted into the supply biasing portion 126. The supply biasing portion 126 is disposed between the solenoid 122 and the movable member 94, and biases the feeder 92 toward the injection portion 42 along the supply direction K0.

[0046] When the power supply to the solenoid 122 is turned off, the feeder 92 is urged toward the ejection unit 42 in the supply direction K0 by the urging force of the supply urging unit 126. In other words, when the power supply to the solenoid 122 is turned off, the plunger 124 moves toward the ejection unit 42 in the supply direction K0 by the urging force of the supply urging unit 126. When the plunger 124 moves toward the ejection unit 42, the feeder 92 fixed to the plunger 124 moves toward the ejection unit 42 in the supply direction K0, and the nail N is fed to the ejection port 46.

[0047] Thereafter, when power is supplied to the solenoid 122, the coil of the solenoid 122 to which current is supplied generates a magnetic attractive force. This magnetic attractive force causes the plunger 124 to move in the supply direction K0 in the opposite direction from the injection unit 42 against the biasing force of the supply biasing unit 126. As a result, the feeder 92 fixed to the plunger 124 moves in the supply direction K0 in the opposite direction from the injection unit 42.

[0048] The supply unit 70 has the above configuration and performs the above operation by power supply according to the control of the control unit 130, thereby supplying the nails N in the magazine unit 74 to the ejection port 46. In other words, the supply unit 70 is operated by the control unit 130 and supplies the nails N, which are fasteners, from the magazine unit 74 to the ejection unit 42.

[0049] <Detection unit 230> 5 and 6 are diagrams showing the injection section 42 and the structure provided in its vicinity, with Fig. 5 being a perspective view from the left side and Fig. 6 being a perspective view from the rear side.

[0050] The detection unit 230 has a light-emitting element 231 and a light-receiving element 232. The light-emitting element 231 is provided on one side (rear side) of the emission unit 42 in the supply direction K0. The light-receiving element 232 is provided on the other side (front side) of the emission unit 42 in the supply direction K0. It is also possible that the light-emitting element 231 is provided on the front side of the emission unit 42 and the light-receiving element 232 is provided on the rear side of the emission unit 42.

[0051] The light-emitting element 231 is, for example, a light-emitting diode (LED) or a semiconductor laser (LD). When energized by power supplied from the battery pack 28, the light-emitting element 231 emits detection light DL along an irradiation direction L that is aligned with the power supply direction K0. However, the irradiation direction L is slightly inclined with respect to the power supply direction K0.

[0052] The light receiving element 232 is configured with, for example, a photodiode, and receives the detection light DL emitted by the light emitting element 231 and converts it into an electrical signal. In other words, the light receiving element 232 is disposed in the irradiation direction L with respect to the light emitting element 231. The light receiving element 232 receives the detection light DL and outputs an electrical signal (detection signal) generated to the control unit 130.

[0053] 5, the irradiation direction L is set in a direction in which the detection light DL passes through the ejection port 46 of the ejection unit 42 and a part of the supply path 82. Specifically, the irradiation direction L is set so that the nail N1 supplied to the ejection port 46 and the nail N2 located in the supply path 82 adjacent to the nail N1 are located on the optical path of the detection light DL. Therefore, if the nail N1 or the nail N2 is present among the multiple nails N, the detection light DL is blocked and does not reach the light receiving element 232. In this case, the light receiving element 232 does not output a detection signal, and therefore the control unit 130 can detect that the nail N is present in at least one of the ejection port 46 and the supply path 82, as will be described in detail below.

[0054] In the following explanation, the range in which the nails N1 and N2 are arranged will be referred to as the detection range DR. Therefore, the detection range DR includes the ejection port 46 of the ejection unit 42 through which the impact unit 48 passes, and the supply path 82. The detection unit 230 can detect the nail N arranged within the detection range DR set in this way. The detection range DR is indicated by the area surrounded by a dashed line in Figure 5.

[0055] In the above description, the position of nail N3 is not included in the detection range DR, but the position of nail N3 may be included in the detection range DR. However, the position of nail N2 is included in the detection range DR. In other words, when multiple nails N are arranged in the supply path 82, the detection range DR is set so as to include the position of at least one nail N among the nails N lined up in the supply path 82. Therefore, it can be said that the nails N present in the detection range DR are fasteners that can be supplied from the magazine unit 74 to the ejection unit 42. In other words, the detection unit 230 can detect nails N that can be supplied from the magazine unit 74 to the ejection unit 42.

[0056] As shown in FIG. 5, each of the multiple nails N is composed of a head Na and a body Nb. The head Na is in the shape of a circular plate. The body Nb is formed on the underside of the head Na and is in the shape of a column extending downward and intersecting with the head Na. The diameter of the body Nb is smaller than the diameter of the head Na. The irradiation direction L is set so that the head Na of such a nail N blocks the detection light DL. In other words, the head Na of the nail N is included in the detection range DR.

[0057] <Control system of work machine 10> The control system of the work implement 10 will be described with reference to Figure 2. Note that a description of the configuration already described will be omitted. The work implement 10 has a main body circuit section 142. The battery pack 28 supplies power to the main body circuit section 142 via the mounting section 16.

[0058] In the main circuit section 142, the inverter circuit 144 converts the power supplied from the battery pack 28 into drive power and supplies it to the electric motor 58. The control signal output circuit 147 operates the inverter circuit 144 based on instructions from the control section 130. The electric motor 58 is driven to rotate by the power supplied via the inverter circuit 144, thereby driving the striking section 48. Three magnetic sensors H detect the rotation state of the rotor 58B of the electric motor 58.

[0059] The rotational position detection circuit 132 detects the rotational position of the pinwheel 68 based on information about the rotational state of the rotor 58B obtained from the three magnetic sensors H. The rotational position information obtained by the rotational position detection circuit 132 is output to the control unit 130. The rotation speed detection circuit 134 detects the amount of rotation of the pinwheel 68 based on the information obtained from the rotational position detection circuit 132.

[0060] Blade detector switch 136 is normally in the OFF state and turns ON when it comes into contact with driver blade 54. Blade detector switch operation detection circuit 138 detects the vertical position and movement state (downward, upward) of driver blade 54 based on the ON information and OFF information output from blade detector switch 136. The information detected by blade detector switch operation detection circuit 138 is output to control unit 130.

[0061] The solenoid detection signal output circuit 152 switches the switching element 153 based on the instruction signal received from the control unit 130. This switches the energization state of the solenoid 122, and the feeder 92 is driven.

[0062] The voltage detection circuit 154 detects a voltage corresponding to the residual power of the battery pack 28 when power is supplied to the electric motor 58 via the inverter circuit 144. The first current detection circuit 155 detects the motor current flowing through the electric motor 58. The second current detection circuit 156 detects the effective value of the current flowing through the solenoid 122. The power switch circuit 158 ​​is a switch that can be turned on and off by an operator. When the power switch circuit 158 ​​is in the on state, it causes the power supply voltage supply circuit 159 to supply the power supply voltage to the control unit 130. When the power switch circuit 158 ​​is in the off state, it causes the power supply voltage supply circuit 159 to stop supplying the power supply voltage to the control unit 130.

[0063] The trigger switch 191 switches from off to on when the trigger 19 is operated by the operator. The trigger switch operation detection circuit 161 detects whether the trigger switch 191 is on or off, and sends information about the on or off state of the trigger switch 191 to the control unit 130. The push switch 162 switches from off to on when the push lever 44 comes into contact with the opposing material G. The push lever 44 switches from off to on when the push lever 44 is separated from the opposing material G. The push switch operation detection circuit 163 detects whether the push switch 162 is on or off, and sends information about the on or off state of the push lever 44 to the control unit 130.

[0064] <Operation of the work machine 10> When the operator applies an operating force to the trigger 19 and performs a pushing operation to press the push lever 44 against the target material G, the work machine 10 performs a driving operation to drive the nail N into the target material G. Until the operator performs the above operation, the striking unit 48 is located in a standby position (first position) in the vertical direction. Note that, when the striking unit 48 is located in the standby position, one end (lower end) of the driver blade 54 in the first direction is located above the other end (upper end) in the first direction of the head Na of the nail N supplied into the injection port 46 by the feeder 92. Note that in the following description, the position of the upper end of the head Na of the nail N (head position) may be referred to as the fastener head position.

[0065] When the operator operates the trigger 19 and the push lever 44, turning on the trigger switch 191 and the push switch 162, the control unit 130 controls the electric motor 58 of the drive unit 56 to be supplied with power from the battery pack 28. When the electric motor 58 receives the power and drives to rotate, the driving force is transmitted to the driver blade 54 of the striking unit 48 via the lifting unit 66. Then, the driver blade 54 (i.e., the striking unit 48) is lifted by the lifting unit 66 from the standby position to the top dead center (second position) on the upper side (the other side of the first direction) against the biasing force of the striking biasing unit 32. In other words, the driver blade 54 rises.

[0066] When the engagement between the rack 55 of the driver blade 54 and the pinion pin 72 of the lifting portion 66 is released, the striking portion 48 moves downward (to one side in the first direction) due to the biasing force of the striking biasing portion 32. That is, the striking portion 48 moves from the top dead center to the bottom dead center (third position).

[0067] The driver blade 54 rises from the standby position (first position) toward the top dead center and then descends to the bottom dead center (third position), whereby the nail N is struck by the driver blade 54 and driven into the mating material G. For this reason, it can be said that the fastener head position of the nail N located inside the injection port 46 is located between the position of the bottom end of the driver blade 54 at the first position and the position of the bottom end of the driver blade 54 at the third position. The movement of the driver blade 54 from the top dead center to the bottom dead center to strike the nail N is the striking operation.

[0068] After the driving operation, the rack 55 and the pinion pin 72 engage again, and the striking unit 48 moves upward against the biasing force of the striking biasing unit 32. In this case, the striking unit 48 is moved from the bottom dead center to the standby position by the lifting unit 66, and stops at the standby position. Then, as will be described in detail later, the next nail N is supplied to the ejection port 46 and supported. However, if the detection unit 230 does not detect the nail N within the detection range DR, the control unit 130 stops the supply of power to the electric motor 58, and stops driving the electric motor 58.

[0069] <Nail N supply operation> The operation of the work machine 10 for supplying nails N will be described with reference to Figures 5, 6, and 7 to 15. Figures 7 to 13 are perspective views from the left side of the ejection unit 42 and the structure provided in the vicinity thereof, similar to Figure 5, and Figure 14 is a perspective view from the rear side of the ejection unit 42 and the structure provided in the vicinity thereof, similar to Figure 6. Figure 15 is a cross-sectional view of the ejection unit 42 in a state in which the nail N2 is in contact with the driver blade 54, and the structure provided in the vicinity thereof.

[0070] As described above, the feeder 92 of the supply unit 70 is biased toward the ejection unit 42 along the supply direction K0 by the supply biasing unit 126. As shown in Fig. 5, when the nail N1 is supplied to the ejection port 46 and the nails N2 and N3 are located in the supply path 82, no detection signal is output from the light receiving element 232 of the detection unit 230 as described above. Therefore, the control unit 130 determines that the nail N is present in the detection range DR, and when the trigger switch 191 and the push switch 162 are turned on, the control unit 130 drives the electric motor 58 as described above.

[0071] Then, when the driver blade 54 moves from the top dead center to the bottom dead center and strikes the nail N1, the nail N is no longer present in the injection port 46, as shown in Figure 7. In this case as well, the nail N2 is present in the detection range DR, so no detection signal is output from the light receiving element 232 of the detection unit 230.

[0072] When the driver blade 54 reaches the bottom dead center, the control unit 130 energizes the solenoid 122. By energizing the solenoid 122, the feeder 92 moves to the supply ready position on the opposite side of the injection unit 42 in the supply direction K0. At the supply ready position, the first claw portion 96A formed on the feeding member 96 of the feeder 92 is positioned between the nail N2, which has been placed at the forefront by the driving of the nail N1, and the nail N3, which is positioned behind the nail N2.

[0073] Thereafter, when the control unit 130 stops the supply of electricity to the solenoid 122, the feeder 92 moves in the supply direction K0 toward the injection unit 42 by the biasing force of the supply biasing unit 126 (see FIG. 8). At this time, the driver blade 54 is moving upward within the injection port 46 from the bottom dead center toward the standby position. Therefore, the nail N2, which has moved as the feeder 92 moves toward the injection unit 42, comes into contact with the driver blade 54 moving within the injection port 46.

[0074] 15, the end of the head Na formed on the nail N2 on the injection part 42 side is in contact with the side surface of the driver blade 54, so the nail N2 does not enter the injection port 46 but is located within the supply path 82. The position of the feeder 92 at this time is called the blade pressing position.

[0075] When the driver blade 54 moves further and the lower end of the driver blade 54 is positioned above the position of the head Na of the nail N2 (fastener head position), the driver blade 54 and the nail N2 no longer come into contact. Therefore, the feeder 92 moves toward the ejection unit 42 due to the biasing force of the supply biasing unit 126. This movement of the feeder 92 supplies the nail N2 into the ejection outlet 46, as shown in FIG. 9 . At this time, the nail N2 supplied into the ejection outlet 46 and the nail N3 located in the supply path 82 are located within the detection range DR. In other words, the detection light DL is blocked by the nails N2 and N3, so the detection unit 230 does not output a detection signal. The position of the feeder 92 at this time is referred to as the supply position.

[0076] The control unit 130, which does not receive a detection signal, determines that the nail N is present in the detection range DR, and when the trigger switch 191 and the push switch 162 are turned on again, drives the electric motor 58. Figure 10 shows the state after the driver blade 54 has again moved toward the bottom dead center and struck the nail N2 supplied to the injection port 46. In this case, the nail N is not present at the injection port 46, but the nail N3 is present in the detection range DR in the supply path 82. In other words, no detection signal is output from the light receiving element 232 of the detection unit 230.

[0077] Thereafter, when the driver blade 54 reaches the bottom dead center and the control unit 130 energizes the solenoid 122, the feeder 92 moves to the supply preparation position, just as when the nail N2 is supplied to the injection unit 42. Then, the first claw portion 96A formed on the feeding member 96 of the feeder 92 is positioned behind the nail N3, which has been placed at the forefront as a result of the nail N2 being driven in.

[0078] When the control unit 130 stops the supply of electricity to the solenoid 122, the feeder 92 moves in the supply direction K0 toward the injection unit 42 by the biasing force of the spring 98 (see FIG. 11). The nail N3, which moves in conjunction with the movement of the feeder 92, comes into contact with the driver blade 54, which is moving within the injection port 46 from the bottom dead center toward the standby position.

[0079] When the driver blade 54 moves further and the lower end of the driver blade 54 is positioned above the position of the head Na of the nail N3 (fastener head position), the feeder 92 moves toward the ejection unit 42, and the nail N3 is supplied into the ejection port 46 as shown in Fig. 12. At this time, the nail N3 supplied into the ejection port 46 is located within the detection range DR. In other words, the detection light DL is blocked by the nail N3, and therefore the detection unit 230 does not output a detection signal.

[0080] In this case, the control unit 130 also determines that the nail N is present in the detection range DR, and when the trigger switch 191 and the push switch 162 are turned on again, the control unit 130 drives the electric motor 58. Figures 13 and 14 show the state after the driver blade 54 has again moved toward the bottom dead center and struck the nail N3 supplied to the injection port 46. In this case, the nail N is no longer present in the injection port 46 or the supply path 82. In other words, the nail N is no longer present in the detection range DR, and the detection light DL is incident on the light-receiving element 232 without being blocked. As a result, a detection signal is output from the detection unit 230.

[0081] The control unit 130, which has received the detection signal, detects that no nails N are present in the detection range DR and prohibits the hammering operation of the impact unit 48. Specifically, the control unit 130 stops the power supply to the electric motor 58. In this case, the control unit 130 may issue a warning using the warning unit, for example, by outputting a warning sound or turning on a warning light, to prompt the operator to replenish the nails N in the magazine unit 74.

[0082] As described above, when a nail N is present within the detection range DR, the detection unit 230 can detect the nail even if the nail N moves and changes its position due to the supply operation. In particular, the detection range DR includes the head Na, which has a larger diameter than the body Nb, and therefore the detection light DL is prevented from passing between the body Nb of adjacent nails N. Therefore, even if the position of the nail N is shifted from its original position due to movement of the feeder 92, it is possible to prevent the nail N from being overlooked in detection. In other words, the detection unit 230 can detect the nail N regardless of the position of the nail N. Furthermore, since the detection unit 230 can detect the presence or absence of the nail N by blocking the detection light DL, it can detect the nail N even when the supply unit 70 is not operating.

[0083] <Timing of driving and supply operations> The timing of the driving operation of the striking unit 48 and the supply operation of the supply unit 70 to supply nails N, both controlled by the control unit 130, will be described below using the timing chart shown in Figure 16. Figure 16 shows the relationship between the current (motor current) [A] of the electric motor 58 and time, the relationship between the position (blade position) [mm] of the lower end of the driver blade 54 and time, the relationship between the duty ratio (solenoid duty) [%] of the solenoid 122 and time, the relationship between the current (solenoid current) [A] of the solenoid 122 and time, and the relationship between the position (solenoid position) [mm] of the solenoid 122 and time. In each of the above relationships, the horizontal axis represents time.

[0084] When trigger switch 191 and push switch 162 are turned on, control unit 130 starts energizing electric motor 58 at time t1. When electric motor 58 starts to rotate due to energization, driver blade 54, which was located at standby position P1, starts to move upward at time t1.

[0085] When the driver blade 54 reaches the top dead center P2 at time t2 and is disengaged from the lifting portion 66, it moves downward toward the bottom dead center P3 due to the biasing force of the impact biasing portion 32. When the driver blade 54 reaches the bottom dead center P3 at time t3, the control portion 130 starts to energize the solenoid 122.

[0086] When the solenoid 122 is energized, the feeder 92 (i.e., the solenoid 122) moves from the supply position K1 along the supply direction K0 toward the supply standby position K2 on the opposite side from the injection unit 42. Then, at time t4 after the solenoid 122 reaches the supply standby position K2, the control unit 130 stops energizing the solenoid 122. As a result, the solenoid 122 starts moving toward the injection unit 42 along the supply direction K0 due to the biasing force of the spring 98. Thereafter, the head Na of the nail N, which has been moved toward the injection unit 42 by the feeder 92, comes into contact with the driver blade 54, and the movement of the solenoid 122 stops at the blade pressing position K3.

[0087] Meanwhile, at time t5, after the solenoid 122 starts moving along the supply direction K0 at time t4, the control unit 130 increases the amount of electricity (motor current) supplied to the electric motor 58. Accordingly, the driver blade 54 also starts moving upward from bottom dead center P3. Thereafter, at time t6, the driver blade 54 is positioned above the fastener head position P4 of the head Na of the nail N positioned in the supply path 82. At this timing, the nail N and the driver blade 54 no longer abut, and the solenoid 122 starts moving again along the supply direction K0 toward the injection unit 42. Thereafter, the solenoid 122 reaches the supply position K1, and the nail N is supplied into the injection port 46.

[0088] When the driver blade 54 reaches the standby position P1 at time t7, the control unit 130 stops supplying electricity to the electric motor 58. After that, the driver blade 54 remains in the standby position P1, and the solenoid 122 remains in the supply position K1, until the trigger switch 191 and the push switch 162 are turned on again.

[0089] According to the first embodiment described above, at least one of the following advantageous effects can be obtained.

[0090] (1) The work machine 10 includes a magazine unit 74 that stores nails N wound in a roll, a supply unit 70 that is operated by the control unit 130 to supply the nails N from the magazine unit 74 to the ejection unit 42, and a detection unit 230 that can detect the nails N that can be supplied from the magazine unit 74 to the ejection unit 42. The detection unit 230 can detect the nails N even when the supply unit 70 is not operating. In other words, the control unit 130 can obtain information regarding the remaining number of nails N stored in the magazine unit 74 without operating the supply unit 70.

[0091] If the lid part 78 is opened or closed by the worker during work, there is a possibility that nails N have been removed from or replenished in the magazine part 74. Therefore, the control part 130 needs to reset the information about the remaining number of nails N that it had recognized up to that point, and acquire new information about the remaining number of nails N. At this time, if the presence or absence of nails N is detected using the load when the supply part 70 is driven, it is necessary to perform an impact with the striking part 48 in order to acquire information about the remaining number of nails N (detect the presence or absence of nails N). At this time, if the remaining number of nails N is zero (i.e., there are no nails N), an empty strike will occur.

[0092] On the other hand, according to the configuration of this embodiment, the detection unit 230 can detect the nails N even when the supply unit 70 is not operating, so the control unit 130 can obtain information about the remaining number of nails N stored in the magazine unit 74 without operating the supply unit 70. Therefore, after the cover 78 of the magazine unit 74 is opened or closed, the control unit 130 can obtain information about the remaining number of nails N (in particular, can recognize that no nails N are stored in the magazine unit 74) before the striking unit 48 performs a striking operation (and the accompanying operation of the supply unit 70). As a result, the occurrence of blank striking can be suppressed, which reduces the risk of impairing the durability of the work machine 10 and improves the workability of the work machine 10.

[0093] (2) The detection unit 230 can detect the nail N regardless of the position of the nail N. This prevents erroneous detection of the presence or absence of the nail N.

[0094] (3) The detection unit 230 can detect nails N arranged within a predetermined detection range DR in the supply path 82. The detection range DR is a range that includes at least one of the nails N lined up in the supply path 82 when a predetermined number or more of nails N are arranged in the supply path 82. This makes it possible to detect whether or not there is a nail N that can be supplied to the injection port 46, regardless of whether or not a driving operation is being performed.

[0095] (4) The detection range DR includes the head Na of the nail N, which is the fastener. This allows the detection unit 230 to detect the nail N using the head Na, which has a larger diameter than the body Nb, thereby improving detection accuracy.

[0096] (5) The detection unit 230 has a light-emitting element 231 and a light-receiving element 232. This allows the nail N to be detected using the detection light DL emitted from the light-emitting element 231, making it possible to detect the nail N even when the supply unit 70 is not driven.

[0097] (6) The light emitting element 231 emits the detection light DL along the supply direction K0 of the nails N. This allows the detection light DL to be emitted to the nails N lined up along the supply direction K0, thereby improving the detection accuracy of the nails N.

[0098] (7) The detection range DR includes the ejection port 46 of the ejection unit 42. This makes it possible to accurately determine whether or not there is a nail N that can be driven.

[0099] <Second embodiment> A working machine of the second embodiment will be described. Below, the same reference numerals will be used to designate components similar to those of the working machine 10 of the first embodiment, and differences from the first embodiment will be mainly described. Points that will not be particularly described are the same as those of the first embodiment. In the second embodiment, the configuration of the detection unit differs from that of the working machine 10 of the first embodiment. This will be described in detail below.

[0100] Fig. 17 is a side view of the ejection unit 42 of the work machine 10 of the second embodiment and the structure provided in the vicinity thereof. Fig. 18 is a perspective view of the ejection unit 42 of the work machine 10 of the second embodiment and the structure provided in the vicinity thereof, as viewed from above. Fig. 19 is a cross-sectional view taken along line AA in Fig. 17. Fig. 18 is a perspective view in which the guide portion 76 of the magazine unit 74 is omitted. Figs. 17 to 19 also show a case in which a nail N1 is supplied into the ejection port 46 and two nails N2 and N3 are positioned in the supply path 82.

[0101] The work machine 10 of the second embodiment includes a detector 330 provided in the guide portion 76 of the magazine portion 74. In the second embodiment, the detector 330 is provided in place of the detector 230 in the circuit block diagram shown in FIG.

[0102] <Detection unit 330> As shown in FIG. 18, the detection unit 330 includes a contact member 331 , a rotation shaft 332 , and a sensor 333 .

[0103] As shown in FIG. 19, the abutment member 331 is rotatably provided on the guide portion 76. The abutment member 331 is formed by a first abutment portion 331A and a second abutment portion 331B. The first abutment portion 331A extends along a first extension direction. The second abutment portion 331B extends along a second extension direction that intersects with the first extension direction. One end of the first abutment portion 331A and one end of the second abutment portion 331B are connected to each other.

[0104] A rotation shaft 332 extending in the vertical direction is provided at the position where the first contact portion 331A and the second contact portion 331B are connected. The contact member 331 is attached to the guide portion 76 via the rotation shaft 332. The contact member 331 is biased in the R4 direction shown in FIG. 18 by an elastic member such as a spring (not shown).

[0105] As shown in Figures 18 and 19, when a nail N is present in the supply path 82, the first extension direction of the first abutment portion 331A is aligned with the supply direction K0. At this time, the side surface 334 of the first abutment portion 331A becomes the surface facing the nail N. Because the abutment member 331 is biased in the R4 direction, the side surface 334 is the abutment surface that abuts against the head Na of the nail N. In other words, the detection unit 330 has a contact member 331 that is a member that abuts against the nail N. The abutment member 331 has a first abutment portion 331A as the abutment portion that abuts against the nail N.

[0106] As shown in the figure, the side surface 334 abuts against the head Na of the nail N2. That is, the side surface 334 abuts against the nail N located at the beginning of the supply path 82. In addition, in the supply direction K0, the length D1 of the first abutting portion 331A along the first extension direction is longer than the distance (spacing) D2 between the nail N2 and the nail N3 lined up in the supply path 82. Note that the spacing D2 is the distance between the centers of adjacent nails N.

[0107] The sensor 333 is configured by, for example, a microswitch, etc. The sensor 333 is disposed in front of the second abutment portion 331B of the abutment member 331. As will be described in detail later, when the abutment member 331 is rotated in the R4 direction by the biasing force and abuts against the side surface 335 of the second abutment portion 331B, the sensor 333 outputs an electric signal (detection signal) to the control unit 130.

[0108] <Nail N supply operation> 19 and 20 to 25, the operation of the work machine 10 for supplying the nails N will be described. Note that FIGS. 20 to 25 are cross-sectional views similar to FIG.

[0109] 19, when nail N1 is supplied to the ejection port 46 and nails N2 and N3 are positioned in the supply path 82, the side surface 334 of the first contact portion 331A contacts nail N2. At this time, the second contact portion 331B does not contact the sensor 333, and no detection signal is output from the sensor 333. Therefore, the control unit 130 determines that nail N is present in the supply path 82. In other words, the position of nail N2 (i.e., the position of nail N positioned at the beginning of the supply path 82) is the detection range DR.

[0110] Thereafter, when the trigger switch 191 and the push switch 162 are turned on, the driver blade 54 strikes the nail N1 as in the first embodiment, and as shown in Fig. 20, the state is such that the nail N is not present in the ejection port 46. In this case as well, the nail N2 located in the detection range DR abuts against the abutting member 331, and the second abutting portion 331B does not abut against the sensor 333, so no detection signal is output from the detection unit 330. Therefore, the control unit 130 determines that the nail N is present in the supply path 82.

[0111] After the driver blade 54 reaches the bottom dead center, the control unit 130 energizes and stops energizing the solenoid 122 in the same manner as in the first embodiment. As a result, the feeder 92 moves toward the ejection unit 42 in the feeding direction K0 due to the biasing force of the spring 98. As the feeder 92 moves, the nails N2 and N3 also move toward the ejection unit 42, and the nail N2 comes into contact with the driver blade 54 (see FIG. 21).

[0112] When the lower end of the driver blade 54 is positioned above the head Na of the nail N2, the nail N2 is supplied to the injection port 46, as in the first embodiment (see FIG. 22). At this time, the nail N3, which is positioned behind the nail N2, also moves toward the injection section 42, and the nail N3 is positioned at the beginning of the supply path 82. In other words, the nail N3 is positioned within the detection range DR. The nail N3 positioned within the detection range DR abuts against the side surface 334 of the first abutment portion 331A. Therefore, the second abutment portion 331B does not abut against the sensor 333, and the sensor 333 does not output a detection signal.

[0113] The control unit 130, which does not receive a detection signal, determines that the nail N is present in the detection range DR, and when the trigger switch 191 is turned on again, drives the electric motor 58. Figure 23 shows the state after the driver blade 54 has again moved toward the bottom dead center and struck the nail N2 supplied to the injection port 46. In this case, the nail N is not present at the injection port 46, but the nail N3 is present within the detection range DR in the supply path 82.

[0114] Thereafter, when the driver blade 54 reaches the bottom dead center and the control unit 130 energizes the solenoid 122, the nail N3 moves toward the ejection unit 42 in the same manner as when the nail N2 is fed to the ejection unit 42 (see FIG. 24). When the driver blade 54 is positioned above the head Na of the nail N3, the nail N3 is fed to the ejection port 46 as shown in FIG. 25.

[0115] When the nail N3 is supplied to the ejection port 46, the nail N is no longer present within the detection range DR. As a result, the contact member 331 rotates in the direction R4 due to the biasing force. The side surface 335 of the rotated second contact portion 331B abuts against the sensor 333, causing the sensor 333 to output a detection signal to the control unit 130.

[0116] The control unit 130, which has received the detection signal, detects that no nails N are present in the detection range DR and prohibits further driving operations by the impact unit 48. Specifically, the control unit 130 stops the supply of power to the electric motor 58. In this case, also in the second embodiment, the control unit 130 may issue a warning using the notification unit, such as outputting a warning sound or turning on a warning light, to prompt the operator to replenish the nails N in the magazine unit 74.

[0117] As described above, when the nail N is present within the detection range DR, the detection unit 330 can detect the nail even if the nail N moves due to the supply operation and the position of the nail N changes. Therefore, even if the position of the nail N is shifted from its original position due to the movement of the feeder 92, it is possible to prevent the nail N from being overlooked in detection. In other words, the detection unit 330 of the second embodiment can also detect the nail N regardless of the position of the nail N.

[0118] In particular, the length D1 of the first abutment portion 331A is longer than the distance D2 between adjacent nails N. Therefore, the first abutment portion 331A can abut against multiple nails N, thereby preventing the abutment member 331 from unintentionally rotating in the direction R4. In other words, erroneous detection by the detection unit 330 is prevented. Furthermore, the detection unit 330 can detect the presence or absence of the nail N by the abutment between the first abutment portion 331A and the nail N, and therefore can detect the nail N even when the supply unit 70 is not operating.

[0119] By having the above configuration, the second embodiment also achieves at least one of the following effects in addition to at least one of the effects (1) to (4) achieved by the first embodiment described above.

[0120] (8) The detection unit 330 has a contact member 331 that contacts the nail N. This allows the detection of the nail N based on whether the detection unit 330 and the nail N contact each other, making it possible to detect the nail N even when the supply unit 70 is not driven.

[0121] (9) In the supply direction K0, the length D1 of the first contact portion 331A is longer than the interval D2 between the nails N lined up in the supply path 82. This allows the first contact portion 331A to come into contact with multiple nails N. As a result, unintentional rotation of the contact member 331 in the R4 direction is suppressed, and erroneous detection of the presence or absence of the nail N is suppressed.

[0122] <Third embodiment> A working machine according to a third embodiment will be described. Below, the same components as those of the working machine 10 of the first embodiment will be given the same reference numerals, and differences from the first embodiment will be mainly described. Points that are not particularly described are the same as those of the first embodiment. These will be described in detail below.

[0123] 26 and 27 are perspective views from the left side of the ejection unit 42 and the structure provided in the vicinity of the ejection unit 42 of the work machine 10 of the third embodiment. Fig. 27 is a perspective view showing the state after the driving and feeding operations have been performed from the state shown in Fig. 26.

[0124] The work machine 10 of the third embodiment includes a detection unit 230 having the same configuration as that of the first embodiment. However, in the detection unit 230 of the third embodiment, the light-emitting element 231 and the light-receiving element 232 are arranged so that the irradiation direction L of the detection light DL is blocked by the third nail N3, counting from the first nail N1, supplied to the outlet 46. In other words, the detection range DR includes the position of the nail N3 located in the supply path 82.

[0125] 26, when the nail N is located within the detection range DR, the light-receiving element 232 does not output a detection signal. As described above, the nail N is not supplied to the ejection port 46 until the lower end of the driver blade 54 is positioned above the fastener head position after the driving operation. Therefore, when the light-receiving element 232 does not output a detection signal, the control unit 130 detects that two or more nails N are present in the ejection port 46 and the supply path 82.

[0126] 27, when the nail N is not located within the detection range DR, the light receiving element 232 outputs a detection signal. Therefore, the control unit 130 detects that the number of nails N in the injection port 46 and the supply path 82 is one or less.

[0127] The control unit 130 performs the operation of supplying the nails N using this operation mode depending on the number of nails N present in the injection port 46 and the supply path 82. The operation modes include a normal mode and a nail holding mode.

[0128] <Normal mode> The operation of supplying the nails N in the normal mode is performed when each nail N is supplied until the penultimate nail N (nail N2 shown in Figures 26 and 27) is supplied to the injection port 46. Specifically, the normal mode is performed by the control unit 130 when no detection signal is output from the detection unit 230. In other words, the control unit 130 performs the normal mode when supplying the next nail N into the injection port 46 in a state where it has detected that two or more nails N exist in the injection port 46 and the supply path 82 combined.

[0129] The normal mode is a mode in which the energization of the solenoid 122 is controlled as shown in the timing chart of Fig. 16 in the first embodiment. Therefore, the control performed by the control unit 130 in the normal mode is the same as the control described in the first embodiment. That is, when the end (lower end) of the driver blade 54 on one side in the first direction passes the fastener head position P4 while the driver blade 54 of the striking unit 48 is moving to the other side (upper side) in the first direction, the supply drive unit 120 is not energized and the supply drive unit 120 is not driven (see time t4 and thereafter in Fig. 16).

[0130] <Nail holding mode> The nail holding mode is performed when the last nail N (nail N3 shown in FIGS. 26 and 27) is supplied to the injection port 46. Specifically, the control unit 130 performs the nail holding mode when the nail N (nail N3 shown in FIGS. 26 and 27) is supplied into the injection port 46 after the driving operation of the second to last nail N (nail N2 shown in FIGS. 26 and 27) has been performed. This will be described in detail below.

[0131] Fig. 28 is a timing chart showing the timing of the driving operation and the supply operation controlled by the control unit 130 in the nail holding mode. As in Fig. 16, Fig. 28 also shows the relationship between the current (motor current) [A] of the electric motor 58 and time, the relationship between the position (blade position) [mm] of the lower end of the driver blade 54 and time, the relationship between the duty ratio (solenoid duty) [%] of the solenoid 122 and time, the relationship between the current (solenoid current) [A] of the solenoid 122 and time, and the relationship between the position (solenoid position) [mm] of the solenoid 122 and time. In each of the above relationships, the horizontal axis represents time.

[0132] After the nail N2 is driven in, the control unit 130 energizes and deenergizes the solenoid 122, moving the feeder 92 to the supply preparation position K2 and then to the blade pressing position K3, just as in the normal mode. That is, the control performed by the control unit 130 up to time t5 is the same as in the case shown in Fig. 16. In this case, the supply drive unit 120 is in a displacement state in which it drives the feeder 92 to displace in the opposite direction against the biasing force of the supply biasing unit 126.

[0133] In the nail holding mode, the control unit 130 again energizes and stops energizing the solenoid 122 while the driver blade 54 moves from the bottom dead center P3 toward the standby position P1 after time t5. As shown in FIG. 28, the control unit 130 energizes the solenoid 122 at time t8.

[0134] Here, time t8 is a timing before time t9 when the lower end of the driver blade 54 is positioned above the lower end (nail tip position P5) of the body portion Nb of the nail N. However, time t8 and time t9 may be the same timing.

[0135] When the solenoid 122 is energized starting at time t8, a solenoid current having a value approximately half the value of the solenoid current energized to the solenoid 122 from time t3 to time t4 is applied. As a result, a force acts on the solenoid 122 in the direction opposite to the ejection portion 42. However, because the value of the solenoid current is small, the force required for the solenoid 122 to move against the biasing force of the supply biasing portion 126 does not act, and the solenoid 122 remains at the blade pressing position K3.

[0136] As described above, a force acting in the direction opposite to the ejection portion 42 acts on the solenoid 122, and therefore the biasing force of the supply biasing portion 126 in the direction toward the ejection portion 42 is canceled or reduced. At this time, the supply drive portion 120 cancels out the biasing force of the supply biasing portion 126 and is in a suppressed state in which the movement of the nail N relative to the feeder 92 is suppressed. As a result, the nail N3 is in contact with the driver blade 54 without being pressed against the driver blade 54.

[0137] In this state, the driver blade 54 moves upward and reaches fastener head position P4 at time t6, after which the control unit 130 stops the supply of electricity to the solenoid 122 at time t10. In other words, while the driver blade 54 of the striking unit 48 is moving toward the other side (upward) in the first direction, when the end (lower end) of the driver blade 54 on one side in the first direction passes beyond fastener head position P4, the supply drive unit 120 is energized and driven.

[0138] After time t10, the supply drive unit 120 is in a stopped state where it does not act on the supply biasing unit 126. Therefore, only the biasing force of the supply biasing unit 126 toward the ejection unit 42 acts on the solenoid 122. As a result, the solenoid 122 reaches the supply position K1, and the nail N3 is supplied into the ejection port 46.

[0139] Thereafter, when the driver blade 54 reaches the standby position P1 at time t7, the control unit 130 stops supplying electricity to the electric motor 58. After that, the driver blade 54 remains at the standby position P1, and the solenoid 122 remains at the supply position K1, until the trigger switch 191 is turned on again.

[0140] Next, the processing procedure for the nail N supply operation in the third embodiment will be described with reference to the flowcharts in Figures 29 and 30. When the power of the work machine 10 is turned on, the control unit 130 reads out a program stored in the storage unit and executes the program, thereby performing each process shown in the flowcharts in Figures 29 and 30.

[0141] In step S1 of FIG. 29, the control unit 130 sets the value of Count to 0. Count is used to count the number of nails N when the remaining number of nails N is two or less. When the remaining number of nails N is two, the value of Count is set to 0. When the remaining number of nails N is one, the value of Count is set to 1. When there are no remaining nails N (the remaining number of nails N is zero), the value of Count is set to 2.

[0142] In step S2 following step S1, the control unit 130 sets the value of the flag to 0. The flag is used to determine whether or not it is possible to manage the remaining number of nails N. When the cover part 78 is rotated around the rotation axis 84 and opened due to, for example, replenishing the nails N in the magazine part 74, and it is therefore not possible to manage the remaining number of nails N, the flag value is set to 0. When the cover part 78 is closed and it is possible to manage the remaining number of nails N, the flag value is set to 1.

[0143] In step S3 following step S2, the control unit 130 determines whether the lid unit 78 is open. In this case, the control unit 130 determines whether the lid unit 78 is open or closed based on the presence or absence of an electrical signal (detection signal) output by a sensor (not shown), such as a microswitch, that detects whether the lid unit 78 is open or closed. If the lid unit 78 is open, the control unit 130 makes a positive determination, and the process proceeds to step S4. In step S4, the control unit 130 sets the value of Flag to 0, and then the process proceeds to step S5. If the lid unit 78 is closed, the control unit 130 makes a negative determination, and the process proceeds to step S5.

[0144] In step S5, the control unit 130 determines whether the trigger switch 191 and the push lever 44 are turned on. If the trigger switch 191 and the push lever 44 are on, the control unit 130 makes a positive determination, and the process proceeds to step S6, which will be described later. If at least one of the trigger switch 191 and the push lever 44 is off, the control unit 130 makes a negative determination, and the process proceeds to step S7. In step S7, the control unit 130 determines whether a predetermined time has passed while at least one of the trigger switch 191 and the push lever 44 remains off. If the predetermined time has passed, the control unit 130 makes a positive determination, and ends the series of processes. If the predetermined time has not passed, the control unit 130 makes a negative determination, and the process returns to step S3.

[0145] In step S6, which is reached after a positive determination is made in step S5, the control unit 130 determines whether or not the remaining number of nails N is two or less. If the remaining number of nails N is two or less, that is, if the detection unit 230 has output a detection signal, the control unit 130 makes a positive determination, and the process proceeds to step S11 shown in Fig. 30, which will be described later. If the remaining number of nails N is three or more, that is, if the detection unit 230 has not output a detection signal, the control unit 130 makes a negative determination, and the process proceeds to step S8.

[0146] In step S8, the control unit 130 energizes the electric motor 58 to drive the nail N. Then, the process proceeds to step S9. In step S9, the control unit 130 energizes the solenoid 122 in the normal mode to supply the next nail N into the injection port 46. Then, the process proceeds to step S10. In step S10, the control unit 130 sets the value of Flag to 1. Then, the process returns to step S3.

[0147] In step S11 of Fig. 30, the control unit 130 determines whether the value of Flag is 0. If the value of Flag is 0, that is, if the lid unit 78 is open, the control unit 130 makes a positive determination, and the process proceeds to step S17, which will be described later. If the value of Flag is 1, that is, if the lid unit 78 is closed, the control unit 130 makes a negative determination, and the process proceeds to step S12.

[0148] In step S12, the control unit 130 determines whether the value of Count is 0. If the value of Count is 0, that is, if the remaining number of nails N is two, the control unit 130 makes a positive determination, and the process proceeds to step S13. In step S13, the control unit 130 causes the driving operation of the nail N to be performed in the same manner as in step S8. Thereafter, the process proceeds to step S14, where the control unit 130 energizes the solenoid 122 in the nail holding mode, and causes the next nail N (nail N3 in Figures 27 and 28) to be supplied into the injection port 46. Thereafter, in step S15, the control unit 130 adds 1 to the value of Count to set it to 1. Thereafter, the process returns to step S3 in Figure 29.

[0149] In step S12, if the value of Count is not 0, i.e., if the value of Count is 1 or 2, the control unit 130 makes a negative determination, and the process proceeds to step S16. In step S16, the control unit 130 determines whether the value of Count is 1. If the value of Count is 1, the control unit 130 makes a positive determination, and the process proceeds to step S18. If the value of Count is not 1, i.e., if the value of Count is 2, the control unit 130 makes a negative determination, and the process proceeds to step S17. In step S17, the control unit 130 stops the power supply to the electric motor 58 and issues a warning using the warning unit, for example, by outputting a warning sound or turning on a warning light, to prompt the operator to replenish nails N in the magazine unit 74. Thereafter, the process returns to step S3 in FIG. 29.

[0150] In step S18, the control unit 130 performs the operation of driving the nail N3 in the same manner as in steps S8 and S13. Then, in step S19, the control unit 130 adds 1 to the value of Count and sets it to 2. After step S19, the process returns to step S3 in FIG.

[0151] In the above description, the work machine 10 is provided with the same detection unit 230 as in the first embodiment to detect whether or not the nail N is present within the detection range DR. However, the work machine 10 may be provided with the same detection unit 330 as in the second embodiment to detect whether or not the nail N is present within the detection range DR.

[0152] Here, a comparative example will be described in which the supply operation of the nails N is performed only in the normal mode, unlike the third embodiment in which the operation mode is switched between the normal mode and the nail holding mode to control the supply operation of the nails N.

[0153] <Comparative Example> 31 to 36 are cross-sectional views showing the injection unit 42 and the structure provided in the vicinity thereof in a comparative example, showing a state in which a nail N is in contact with the driver blade 54. FIGS. 31 to 33 show a state in which there are multiple nails N in the supply path 82. FIGS. 31 and 32 show a case in which the lower end of the driver blade 54 is positioned below the head Na of the leading nail N, and FIG. 33 shows a case in which the lower end of the driver blade 54 is positioned above the head Na of the leading nail N. As shown in FIGS. 31 to 33, the multiple nails N are connected by a connecting part M such as a wire.

[0154] As shown in Figures 31 and 32, the leading nail N is pressed against the driver blade 54 by the biasing force of the supply biasing part 126, and therefore a moment is generated in the leading nail N as the driver blade 54 moves upward. That is, a rotational force is generated in the body Nb of the nail N in the direction R5 with the head Na as the fulcrum. However, since multiple nails N are connected by the connecting part M, the connecting part M prevents the leading nail N from rotating in the direction R5. For this reason, the leading nail N is normally supplied into the injection port 46 as shown in Figure 33.

[0155] 34 to 36 show a state when only one nail N, i.e., the last nail N, is present in the supply path 82. Figs. 34 and 35 show a case where the lower end of the driver blade 54 is positioned below the head Na of the first nail N, and Fig. 36 shows a case where the lower end of the driver blade 54 is positioned above the head Na of the first nail N. As shown in Figs. 34 to 36, unlike the cases shown in Figs. 31 to 33, there is no other nail N connected to the last nail N by the connecting portion M.

[0156] In this case, too, when the nail N is pressed against the driver blade 54 by the biasing force of the supply biasing portion 126, a moment is generated on the nail N due to the upward movement of the driver blade 54. That is, as shown in FIGS. 34 and 35, a rotational force is generated in the body Nb of the nail N in the direction R5 with the head Na as the fulcrum. And, because the nail N is not connected to other nails N by the connecting portion M, the body Nb of the nail N rotates in the direction R5. As a result, as shown in FIG. 36, the nail N is supplied into the injection port 46 in an inclined state. For this reason, the driver blade 54 cannot strike the head Na of the nail N, resulting in nail clogging or blank striking.

[0157] In contrast to the above comparative example, in the third embodiment, when only the last nail N is present in the supply path 82, the control unit 130 controls the supply operation in the nail holding mode. That is, the operation of the supply drive unit 120 is controlled in a plurality of drive states including a displacement state, a suppression state, and a drive state. As described above, when the lower end of the driver blade 54 is positioned below the head Na of the nail N, the biasing force of the supply biasing unit 126 is canceled or reduced.

[0158] Therefore, no pressing force is applied to the nail N against the driver blade 54, and no moment is generated on the nail N as in the comparative example. In other words, the nail N is prevented from rotating around the head Na as a fulcrum. As a result, as shown in the cross-sectional view of the ejection part 42 and the structure provided in its vicinity in FIG. 37, the nail N is supplied into the ejection port 46 in a state where it is prevented from tilting relative to the extension direction (vertical direction) of the ejection part 42. Therefore, it becomes possible for the driver blade 54 to strike the head Na, and nail clogging and blank striking are prevented.

[0159] By having the above configuration, the third embodiment also achieves at least one of the following effects in addition to at least one of the effects (1) to (9) achieved by the first or second embodiment described above.

[0160] (10) When the detection unit 230 detects that there are two or more nails N in the magazine unit 74 and the ejection unit 42, the supply drive unit 120 does not operate when the impact unit 48 is ascending and the lower end of the impact unit 48 passes the fastener head position P4 of the nail N. When the detection unit 230 detects that there is one or fewer nails N in the magazine unit 74 and the ejection unit 42, the supply drive unit 120 operates when the impact unit 48 is ascending and the lower end of the impact unit 48 passes the fastener head position P4 of the nail N. As a result, when there is one or fewer nails N, no pressing force acts on the nail N against the driver blade 54 when the nail N is in contact with the driver blade 54. This prevents the nail N from rotating around the head Na as a fulcrum, and prevents the nail N from being supplied into the ejection port 46 at an angle relative to the vertical direction. As a result, nail clogging in the ejection port 46 is prevented, and the driver blade 54 can be driven normally.

[0161] (11) The supply drive unit 120 operates in a plurality of drive states including a displacement state, a suppression state, and a stop state. The displacement state is a drive state of the supply drive unit 120 that drives the feeder 92 to displace in the opposite direction to the ejection unit 42 against the biasing force of the supply biasing unit 126. The suppression state is a drive state of the supply drive unit 120 that cancels out the biasing force of the supply biasing unit 126 and suppresses the movement of the nails N relative to the feeder 92. The stop state is a drive state of the supply drive unit 120 that does not act on the supply biasing unit 126. In the nail holding mode, the supply drive unit 120 operates in the above-mentioned plurality of drive states, thereby making it possible to supply the nails N to the ejection port 46 in a state in which nail clogging is suppressed.

[0162] Although various embodiments and modifications have been described above, the present invention is not limited to these. Other embodiments that are conceivable within the scope of the technical idea of ​​the present invention are also included within the scope of the present invention. [Explanation of symbols]

[0163] 10 Work machine, 19 Trigger, 32 Impact energizing portion, 42 Injection portion, 46 Injection port, 48 Impact portion, 54 Driver blade, 56 Drive portion, 66 Lifting portion, 70 Supply portion, 74 Magazine portion, 75 Drum portion, 76 Guide portion, 78 Lid portion, 82 Supply path, 92 Feeder, 96 Feed member, 120 Supply drive portion, 122 Solenoid, 124 Plunger, 126 Supply energizing portion, 130 Control portion, 191 Trigger switch, 230, 330 Detection portion, 231 Light-emitting element, 232 Light-receiving element, 331 Contact member, 331A First contact portion, 331B Second contact portion, 333 Sensor, DL Detection light, DR Detection range, N, N1, N2, N3 Nail, Na Head, Nb Body, P1 Standby position, P2 top dead center, P3 bottom dead center P4 Fastener head position, P5 Nail tip position

Claims

1. an injection section to which a fastener is supplied; a striking section that strikes the fastener supplied to the injection section; a magazine unit that stores the fasteners wound in a roll; A control unit; a supply unit operated by the control unit to supply the fastener from the magazine unit to the ejection unit; a detection unit capable of detecting the fastener that can be supplied from the magazine unit to the ejection unit, The work machine, wherein the detection unit is capable of detecting the fastener even when the supply unit is not operating.

2. The work machine according to claim 1, The work machine, wherein the detection unit is capable of detecting the fastener regardless of the position of the fastener.

3. The work machine according to claim 2, the magazine unit has a supply path that is a passage for supplying the plurality of fasteners to the ejection unit in a line, the detection unit is capable of detecting the fastener arranged within a predetermined detection range in the supply path, The detection range is a range that includes at least one of the fasteners lined up in the supply path when a predetermined number or more of the fasteners are arranged in the supply path.

4. The work machine according to claim 3, The fastener is a nail having a head and a body, The work machine, wherein the head is included in the detection range.

5. The work machine according to claim 3, The detection unit has a light-emitting element and a light-receiving element.

6. The work machine according to claim 5, The light-emitting element emits light along a feeding direction of the fastener.

7. The work machine according to claim 6, the ejection portion has an ejection port through which the striking portion passes; The detection range includes the injection port.

8. The work machine according to claim 3, The work machine, wherein the detection portion is an abutting member that abuts against the fastener.

9. The work machine according to claim 8, the abutment member has an abutment portion that abuts against the stopper, A work machine, wherein the length of the abutment portion in the supply direction of the fasteners is longer than the interval between the fasteners lined up in the supply path.

10. The work machine according to any one of claims 1 to 9, an impact biasing portion that biases the impact portion to one side in a first direction; a lifting portion that lifts the striking portion toward the other side in the first direction against the biasing force of the striking biasing portion; an operation unit operated by an operator, The supply unit includes: A feed member; a supply biasing portion that biases the feed member toward the injection portion; a supply drive unit that can drive the feed member so as to urge it in a direction opposite to the injection unit, When the operating unit is operated while the striking unit is located at a first position, the striking unit is moved by the lifting unit to the other side in the first direction to a second position, moved by the biasing force of the striking biasing unit to one side in the first direction from the second position to a third position, moved by the lifting unit to the other side in the first direction from the third position to the first position, and then stopped at the first position; a stopper head position, which is the position of the other end of the stopper located in the injection section in the first direction, is located between the position of the one end of the striking section in the first direction at the first position and the position of the one end of the striking section in the first direction at the third position; The supply drive unit is When the detection unit detects that there are two or more stoppers in the magazine unit and the ejection unit, the impact unit is not driven when the end of the impact unit on one side in the first direction exceeds the head position of the stopper while the impact unit is moving to the other side in the first direction, A work machine that is activated when the detection unit detects that there is one or fewer stoppers in the magazine unit and the ejection unit, and when the impact unit is moving to the other side in the first direction and the end of the impact unit on one side in the first direction passes the head position of the stopper.

11. The work machine according to claim 10, The supply drive unit is a displacement state in which the feed member is driven to displace in a direction opposite to the injection unit against the biasing force of the supply biasing unit; a suppression state in which the biasing force of the supply biasing portion is canceled out to suppress movement of the stopper relative to the feed member; a stop state in which no action is exerted on the supply biasing portion; The work machine is capable of implementing a plurality of drive states including:

12. an injection section to which a fastener is supplied; a striking unit that performs a striking action by moving to strike the fastener supplied to the ejection unit; a magazine unit that stores the fasteners wound in a roll; A control unit; a supply unit operated by the control unit to supply the stopper from the magazine unit to the ejection unit, the magazine unit has a lid unit that is opened and closed when inserting and removing the fastener from the magazine unit, A work machine, wherein the control unit is capable of recognizing that the stopper is not stored in the magazine unit after the lid unit is opened or closed and before the impact unit performs an impact operation.

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