Working machine

Abstract

To prevent fragments and broken pieces of a connector from entering the inside of a working machine.SOLUTION: In one embodiment, the nailing machine includes the ejection portion 3 having the ejection path 50. The injection device 3 includes a peripheral wall 70 that forms the injection path 50, and a supply port 71 and a discharge port 72 that penetrate the peripheral wall 70 and cause the injection path 50 to communicate with the outside of the peripheral wall 70. The nails N1 stored in the magazine part are fed to the injection path 50 through the feed port 71. The discharge port 72 is provided at a position different from the supply port 71 in the circumferential direction of the injection path 50, and penetrates the peripheral wall 70 in the longitudinal direction of the injection device 3.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work machine, and more particularly to a work machine suitable for driving fasteners into mating materials such as wood or asphalt roofing materials. [Background technology]

[0002] Patent Document 1 describes a nail driving machine, which is one of the above-mentioned work machines. The nail driving machine described in Patent Document 1 has a magazine that stores multiple nails (connected nails) connected by a wire, and a driver blade that strikes and drives out the nails supplied from the magazine.

[0003] The driver blade strikes the nail (leading nail / No. 1 nail) located at the front of the linked nails. The No. 1 nail struck by the driver blade is separated from the nail (No. 2 nail) located behind it and driven out. More specifically, when the No. 1 nail is struck by the driver blade, the wire connecting the No. 1 nail and the No. 2 nail is cut, and the No. 1 nail is separated from the other nails, including the No. 2 nail.

[0004] At this time, the wire connecting nail No. 1 and nail No. 2 is cut at a position close to nail No. 1. As a result, a fragment of the wire connecting nail No. 1 and nail No. 2 remains on nail No. 2 after nail No. 1 is separated.

[0005] When the next driving operation is performed, the No. 2 nail with the wire fragment remaining is struck and driven out as the No. 1 nail. At this time, the wire connecting the No. 2 nail to the nail behind it is cut in the same way as above. In other words, the nail struck by the driver blade always has a wire fragment remaining.

[0006] Typically, wire fragments remaining in the nail are driven out together with the nail without detaching from the nail. However, wire fragments can become detached from the nail during the driving operation. Furthermore, wire fragments that have detached from the nail can enter the inside of the nail driver. For example, wire fragments can be pulled into the inside of the nail driver by the reciprocating driver blade. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2023-157401 Summary of the Invention [Problem to be solved by the invention]

[0008] In a work machine that handles a plurality of fasteners connected by connecting devices, it is necessary to prevent fragments and pieces of the connecting devices from entering the inside of the work machine. [Means for solving the problem]

[0009] In one embodiment, the work machine includes an injection unit having an injection path, a striking unit movable in the longitudinal direction of the injection unit, a biasing unit that moves the striking unit toward the tip of the injection unit to strike a fastener in the injection path, and a magazine unit that stores a plurality of the fasteners. The injection unit has a peripheral wall that forms the injection path, and first and second openings that penetrate the peripheral wall and communicate the injection path with the outside of the peripheral wall. The fasteners stored in the magazine unit are supplied to the injection path through the first opening. The second opening is located at a different position from the first opening in the circumferential direction of the injection path and penetrates the peripheral wall in the longitudinal direction of the injection unit. [Effects of the Invention]

[0010] According to the present invention, in a work machine that handles a plurality of fasteners connected by connecting devices, it is possible to prevent fragments and pieces of the connecting devices from entering the inside of the work machine. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is an explanatory diagram illustrating a configuration of a nail driver. [Figure 2] 10 is a partial cross-sectional view showing the process in which a nail is fed into the ejection path and struck. FIG. [Figure 3] FIG. 2 is a vertical cross-sectional view showing the structure of an injection unit. [Figure 4] FIG. 3 is a cross-sectional view showing the structure of an injection section. [Figure 5] FIG. 10 is a vertical cross-sectional view showing how fragments detached from the nail are discharged from the discharge port. [Figure 6] FIG. 10 is a cross-sectional view showing how fragments detached from the nail are discharged from the discharge port. [Figure 7] FIG. 2 is a side view showing the emission section and its surroundings. [Figure 8] 1A is a vertical cross-sectional view showing the push lever positioned at the protruding position, and FIG. 1B is a vertical cross-sectional view showing the push lever positioned at the depressed position. [Figure 9] 1A is a vertical cross-sectional view showing the push lever positioned at the protruding position, and FIG. 1B is a vertical cross-sectional view showing the push lever positioned at the depressed position. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. In all drawings used to describe the embodiment, the same reference numerals are used for the same or substantially the same configurations and elements. Furthermore, as a general rule, once a configuration or element has been described, it will not be described again.

[0013] (First embodiment) The working machine according to this embodiment is a driving machine suitable for driving fasteners into mating materials such as wood, asphalt roofing materials, etc. More specifically, the working machine according to this embodiment is a nailing machine for driving nails into mating materials.

[0014] <Outline of the nail gun> 1 is an explanatory diagram showing a schematic configuration of a nail driver 1A according to the present embodiment. The nail driver 1A has a housing 2, an ejection unit 3, and a magazine unit 4. The housing 2 contains a striking unit 20, a biasing unit 30, a drive unit 40, etc. The ejection unit 3 has an ejection path 50, and the magazine unit 4 contains a plurality of nails N.

[0015] The nails N stored in the magazine unit 4 are supplied one by one to the injection path 50. The nails N supplied to the injection path 50 are struck by the striking unit 20, which moves under the force of the biasing unit 30, and are driven out of the injection path 50 and into the target material W. The striking unit 20, which struck the nail N, is moved by the driving unit 40 in the direction opposite to the biasing direction of the biasing unit 30.

[0016] The housing 2 includes a cylinder case 10, a motor case 11, and a handle 12. The cylinder case 10 houses a cylinder 31, a chamber 32, and the like that constitute the biasing unit 30, and the motor case 11 houses an electric motor 41, a reduction gear 42, a pinwheel 43, and the like that constitute the drive unit 40.

[0017] The cylinder case 10 is generally cylindrical overall. The motor case 11 and the handle 12 extend from the outer circumferential surface of the cylinder case 10. The injection unit 3 extends from the bottom of the cylinder case 10 in a direction different from the motor case 11 and the handle 12.

[0018] More specifically, the injection section 3 extends from the bottom of the cylinder case 10 in the same direction as the longitudinal direction of the cylinder case 10. In other words, the longitudinal direction of the injection section 3 and the longitudinal direction of the cylinder case 10 are parallel to each other.

[0019] Here, for convenience of explanation, the longitudinal direction of the injection unit 3 and the cylinder case 10 is defined as the "up-down direction", and the longitudinal direction of the motor case 11 is defined as the "front-rear direction".

[0020] According to the above definition, the motor case 11 is located below the handle 12 and extends rearward from the cylinder case 10. The handle 12 is located above the motor case 11 and extends obliquely rearward from the cylinder case 10. Furthermore, the injection unit 3 extends downward from the bottom of the cylinder case 10.

[0021] A connection part 13 is provided between the rear end of the motor case 11 and the rear end of the handle 12, and a battery attachment part is provided on the back side of the connection part 13. A battery pack 5 is attached to and detached from the battery attachment part. When the battery pack 5 is attached to the battery attachment part, the connection terminals of each battery pack come into contact with each other, establishing electrical continuity.

[0022] The battery pack 5 attached to and detached from the battery attachment section is a rechargeable secondary battery. More specifically, the battery pack 5 is a lithium ion battery. However, the battery pack 5 is not limited to a lithium ion battery.

[0023] A controller 6 serving as a control section is housed inside the connection section 13. The controller 6 comprehensively controls the operation of the nail driver 1A, including the operation of the striking section 20.

[0024] <Striking section> The striking section 20 has a piston 21 and a driver blade 22, and is movable in the longitudinal direction (up and down direction) of the injection section 3. More specifically, the piston 21 is housed in a cylinder 31 so as to be movable up and down, and the driver blade 22 extends downward from the piston 21.

[0025] As described above, the striking unit 20 is driven to reciprocate up and down by the biasing unit 30 and the driving unit 40. More specifically, under the biasing force of the biasing unit 30, the piston 21 moves downward within the cylinder 31, and the driver blade 22 moves downward within the injection path 50. Also, under the driving force of the driving unit 40, the piston 21 moves upward within the cylinder 31, and the driver blade 22 moves upward within the injection path 50.

[0026] When the piston 21 rises to the top dead center, the penetration length of the driver blade 22 into the injection path 50 becomes shortest, and when the piston 21 falls to the bottom dead center, the penetration length of the driver blade 22 into the injection path 50 becomes longest.

[0027] <Energy applying part> As described above, the biasing unit 30 has the cylinder 31 and the chamber 32. The chamber 32 is disposed above the cylinder 31 and communicates with the cylinder 31. As a result, a pressure chamber 33 is formed by the internal space of the chamber 32 and the upper chamber of the cylinder 31 (the space above the piston 21).

[0028] The pressure chamber 33 is filled with air, which is a compressible fluid. The air in the pressure chamber 33 is compressed as the piston 21 rises. The compressed air in the pressure chamber 33, whose pressure has increased, pushes the piston 21 down when a predetermined condition is met. In other words, the biasing unit 30 moves the striking unit 20 toward the tip of the ejection unit 3.

[0029] <Drive unit> As described above, the drive unit 40 has the electric motor 41, the reduction gear 42, and the pinwheel 43. Under the control of the controller 6, power is supplied from the battery pack 5 to the electric motor 41. The electric motor 41 operates upon receiving power supplied from the battery pack 5 and outputs a rotational driving force.

[0030] The rotational driving force output from the electric motor 41 is transmitted to the pinwheel 43 via the reduction gear 42. That is, the electric motor 41 rotates the pinwheel 43 under the control of the controller 6. The pinwheel 43 has a plurality of pins. Meanwhile, the driver blade 22 is provided with a plurality of racks that engage with the pins of the pinwheel 43.

[0031] When the pinwheel 43 is rotated by the electric motor 41, the multiple pins of the pinwheel 43 sequentially engage with the multiple racks provided on the driver blade 22, pushing up the driver blade 22. In other words, the drive unit 40 receives electric power and operates to move the striking unit 20 toward the base end of the ejection unit 3.

[0032] When the striking portion 20 is pushed up as described above, the air in the pressure chamber 33 is compressed. Thereafter, when the piston 21 reaches the top dead center, the engagement between the pin and the rack is released. The striking portion 20 is then pushed down by the biasing portion 30. More specifically, the piston 21 and the driver blade 22 are pushed down by the air pressure in the pressure chamber 33. Thereafter, the pin and the rack are engaged again, and the striking portion 20 is pushed up again.

[0033] <Magazine section> The magazine unit 4 has a storage unit 61 and a feeder 62, and is located behind the ejection unit 3. The storage unit 61 is a container made of synthetic resin that can store multiple nails N, and one end of the storage unit 61 is connected to the ejection unit 3.

[0034] The multiple nails N stored in the storage section 61 are connected to each other and wound in a spiral shape, and are generally called "rolled nails." Therefore, in the following description, the multiple nails N stored in the storage section 61 may be collectively referred to as "rolled nails."

[0035] The nails N constituting the rolled nail are arranged in a row and connected to one another. More specifically, the nails N constituting the rolled nail are arranged in a row at equal intervals along the upper wire 8a and the lower wire 8b and joined to the upper wire 8a and the lower wire 8b to form a belt-shaped connected nail. The belt-shaped connected nails formed in this manner are stored in the storage section 61 in a spirally wound state.

[0036] The upper wire 8a and the lower wire 8b are an example of a connector. The nails N constituting the roll nail are an example of a plurality of fasteners connected by a connector.

[0037] The feeder 62 supplies the nails N one by one to the injection path 50. The feeder 62 is driven by a spring and a solenoid actuator in a direction approaching the injection unit 3 (forward) and in a direction away from the injection unit 3 (rearward).

[0038] The feeder 62 is constantly biased forward by a spring, and when power is supplied to the solenoid actuator, it is temporarily pushed backward against the bias of the spring. Therefore, by intermittently supplying power to the solenoid actuator, the feeder 62 can be reciprocated in the feeding direction FD.

[0039] 2 is a partial cross-sectional view showing the process in which nails N are supplied to the injection path 50 and struck. As shown in FIG. 2(a), the feeder 62 is provided with feeding claws 63 and 64 that enter between the nail N located at the top of the roll of nails (hereinafter, may be referred to as "nail N1" to distinguish it from the other nails N) and the nail N located second (hereinafter, may be referred to as "nail N2" to distinguish it from the other nails N).

[0040] One of the feeding claws 63 passes under the upper wire 8a and crosses the upper wire 8a. The other feeding claw 64 passes under the lower wire 8b and crosses the lower wire 8b. When the feeder 62 moves forward due to the bias of the spring, the feeding claws 63 and 64 push the nail N1 forward. As a result, the nail N1 is fed into the injection path 50.

[0041] Thereafter, the nail N1 sent into the injection path 50 is struck in the injection path 50 by the driver blade 22 moving downward, as shown in Figures 2(b) and 2(c). As already mentioned, the driver blade 22 is moved downward by the biasing force of the biasing unit 30. From another perspective, the biasing unit 30 causes the driver blade 22 to strike the nail N1 in the injection path 50.

[0042] When the nail N1 is struck by the driver blade 22, the upper wire 8a is cut by the feed claw 63, and the lower wire 8b is cut by the feed claw 64. In other words, the nail N1 is separated from the other nails N including the nail N2.

[0043] Here, one side of the shank 7 of the nail N1 is joined to the upper wire 8a and the lower wire 8b. From another perspective, the joining point between the nail N1 and the upper wire 8a and the lower wire 8b is off-center from the center of the shank 7. Therefore, when the upper wire 8a and the lower wire 8b are cut as described above, a rotational moment is generated in the nail N1. As a result, the nail N1 rotates in the circumferential direction of the injection path 50 within the injection path 50.

[0044] Looking at it from another perspective, when the nail N1 is driven out, the fragment 9a of the upper wire 8a and the fragment 9b of the lower wire 8b that remain on the shank 7 of the nail N1 from the previous driving operation rotate circumferentially around the injection path 50 within the injection path 50.

[0045] More specifically, the fragments 9a and 9b protruding from the shank 7 of the nail N1 shown in Fig. 2(a) rotate by approximately 90 degrees in the direction of the arrow r as the nail N1 is struck and driven out. In other words, the fragments 9a and 9b shown in Fig. 2(a) rotate by approximately 90 degrees from the front to the back of the page in Fig. 2 as the nail N1 is struck and driven out.

[0046] <Injection part> Figure 3 is a vertical cross-sectional view showing the structure of the injection unit 3. Figure 4 is a horizontal cross-sectional view showing the structure of the injection unit 3. However, Figures 3 and 4 do not show cross sections of the injection unit 3 at the same time during the driving operation.

[0047] The injection section 3 has a peripheral wall 70 that forms the injection path 50. The peripheral wall 70 is provided with a first opening 71, a second opening 72, and a groove 73.

[0048] The first opening 71 and the second opening 72 are through holes formed in the peripheral wall 70. From another perspective, the first opening 71 and the second opening 72 communicate between the inside and outside of the peripheral wall 70. As a result, the injection path 50 formed by the peripheral wall 70 communicates with the outside of the peripheral wall 70 via the first opening 71 and the second opening 72.

[0049] The groove 73 is a recess formed in the peripheral wall 70. The groove 73 extends in the vertical direction and is provided on a movement path of a rack provided on the driver blade 22. From another perspective, when the driver blade 22 moves up and down within the injection path 50, the rack, which is part of the driver blade 22, moves up and down inside the groove 73.

[0050] <First opening> The nails N1 pushed out by the feeding claws 63, 64 (FIG. 2) of the feeder 62 are fed into the injection path 50 through the first opening 71. In other words, the first opening 71 is a supply port for feeding the nails N1 into the injection path 50. Therefore, in the following description, the first opening 71 may be referred to as the "supply port 71."

[0051] The feeder 62 pushes the nails N1 forward to feed them into the injection path 50. The supply port 71 is provided at a connection position between the injection unit 3 and the magazine unit 4, and penetrates the peripheral wall 70 in the supply direction FD. In other words, when viewed in the longitudinal direction of the injection path 50, the supply port 71 is located on one side of the axis AX of the injection path 50 in the supply direction FD, and penetrates the peripheral wall 70 in the radial direction of the injection path 50.

[0052] <Second Opening> Although the details will be explained later, the second opening 72 is a through-hole for discharging the fragments 9a of the upper wire 8a and the fragments 9b of the lower wire 8b that have detached from the nail N1. Therefore, in the following explanation, the second opening 72 may be referred to as the "discharge port 72."

[0053] The discharge port 72 is provided at an intersection 74 that is a part of the peripheral wall 70. The peripheral wall 70 is provided at the lower end of the groove 73 and includes the intersection 74 that extends in a direction intersecting with the longitudinal direction of the injection part 3. The discharge port 72 is provided at this intersection 74.

[0054] As described above, the intersection 74 extends in a direction intersecting the longitudinal direction of the ejection section 3, but more specifically, the intersection 74 extends in a direction intersecting obliquely with the longitudinal direction of the ejection section 3. In other words, the intersection 74 is inclined with respect to the longitudinal direction of the ejection section 3.

[0055] The discharge port 72 penetrates the intersection portion 74 in the vertical direction. In other words, the discharge port 72 penetrates the intersection portion 74 in the longitudinal direction of the injection unit 3. Furthermore, the discharge port 72 is provided at a different position in the circumferential direction of the injection path 50 from the supply port 71. From another perspective, the groove 73 and the intersection portion 74 are provided at a different position in the circumferential direction of the injection path 50 from the supply port 71. In other words, when viewed in the longitudinal direction of the injection path 50, the groove 73 and the intersection portion 74 are located on one side of the axis AX of the injection path 50 in the intersecting direction CD that intersects with the supply direction FD, and penetrate the peripheral wall 70 in the radial direction of the injection path 50.

[0056] The feeding direction FD and the cross direction CD are inclined at 80 degrees to each other, but this angle is suitable for discharging the fragments 9a and 9b described later as long as it is in the range of 30 degrees or more and 150 degrees or less.

[0057] Furthermore, the position of the discharge port 72 in the longitudinal direction of the injection path 50 is different from the position of the supply port 71 in the same direction. Specifically, the discharge port 72 is provided at a lower position than the supply port 71. More specifically, the upper end 72a of the discharge port 72 is located lower than the upper end 71a of the supply port 71.

[0058] The upper end 72a of the discharge port 72 is the end of the discharge port 72 on the base end side of the injection part 3. The upper end 71a of the supply port 71 is the end of the supply port 71 on the base end side of the injection part 3.

[0059] The positional relationship between the supply port 71 and the discharge port 72 as described above is set in accordance with the movement of the nail N1 within the injection path 50. As described above, the nail N1 struck by the driver blade 22 moves toward the tip side (downward) of the injection path 50 while rotating in the circumferential direction of the injection path 50. As a result, the fragments 9a and 9b protruding from the shank 7 of the nail N1 also move toward the tip side (downward) of the injection path 50 while rotating in the circumferential direction of the injection path 50.

[0060] Therefore, taking into consideration the above-described movements of the fragments 9a and 9b, the position of the discharge port 72 is set so that the fragments 9a and 9b detached from the nail N1 are discharged outside the injection path 50 more reliably.

[0061] Specifically, the discharge outlet 72 is provided at a different position from the supply port 71 in the circumferential direction of the injection path 50, in consideration of the fact that the fragments 9a and 9b rotate in the circumferential direction of the injection path 50. Furthermore, the discharge outlet 72 is provided at a lower position than the supply port 71, in consideration of the fact that the fragments 9a and 9b move toward the tip side (downward) of the injection path 50.

[0062] <Discharge of wire fragments> Fig. 5 is a vertical cross-sectional view showing how the fragments 9a detached from the nail N1 are discharged from the discharge port 72. Fig. 6 is a horizontal cross-sectional view showing how the fragments 9a detached from the nail N1 are discharged from the discharge port 72.

[0063] As described above, the fragment 9a of the upper wire 8a and the fragment 9b of the lower wire 8b that were cut in the previous driving operation remain on the shank 7 of the nail N1 that is struck by the driver blade 22. These fragments 9a and 9b may be driven out together with the nail N1 without separating from the nail N1, or may separate from the nail N1.

[0064] Furthermore, both the fragments 9a and 9b may be detached from the nail N1, or only one of them may be detached from the nail N1. Figures 5 and 6 show, as an example, a state in which only one fragment 9a is detached from the nail N1 and discharged from the discharge port 72.

[0065] As shown in FIGS. 5(a) and 5(b), before being struck by the driver blade 22, a fragment 9a of the upper wire 8a and a fragment 9b of the lower wire 8b remain on the nail N1.

[0066] Thereafter, in the process of striking and driving out the nail N1, the fragment 9b of the lower wire 8b remains on the nail N1, while the fragment 9a of the upper wire 8a detaches from the nail N1. The fragment 9a detaches from the nail N1 due to, for example, the impact of the strike by the driver blade 22 or contact with the peripheral wall 70.

[0067] 5(c) and (d), the fragments 9a detached from the nail N1 are discharged to the outside of the injection section 3 (injection path 50) through the discharge port 72. For example, the fragments 9a are discharged from the discharge port 72 by an air current generated in the injection path 50 as the driver blade 22 descends.

[0068] When the driver blade 22 descends, the rack 22a moves downward inside the groove 73. As the rack 22a descends at high speed inside the narrow groove 73, a downward airflow is generated inside the groove 73. Meanwhile, the exhaust port 72 passes through an intersection 74 provided at the lower end of the groove 73 in the vertical direction.

[0069] As a result, the fragments 9a are pushed by the downward air current generated in the groove 73 and are discharged from the discharge port 72. However, the fragments 9a may also be pushed by the rack 22a and be discharged from the discharge port 72. Alternatively, the fragments 9a may also be pushed by both the air current and the rack 22a and be discharged from the discharge port 72.

[0070] In either case, the fragments 9a detached from the nail N1 are discharged to the outside of the injection path 50 through the discharge port 72. Therefore, the fragments 9a detached from the nail N1 are prevented from entering the cylinder case 10 and the motor case 11 shown in FIG.

[0071] (Second embodiment) The work machine according to this embodiment is a nail driver having the same basic configuration as the nail driver according to embodiment 1. Therefore, a description of the configuration that is the same as or substantially the same as the nail driver according to embodiment 1 will be omitted, and only the different configuration will be described below.

[0072] 7(a) and (b) are side views showing the ejection unit 3 and its surroundings of the nail driver according to this embodiment. A push lever 80 that is movable relative to the ejection unit 3 is provided around the ejection unit 3.

[0073] 7(a) (protruding position) and the position shown in Fig. 7(b) (retracted position) around the ejection unit 3. In other words, the push lever 80 is capable of moving relatively up and down around the ejection unit 3.

[0074] The push lever 80 is constantly biased downward by a coil spring (not shown). On the other hand, when the tip (lower end) of the push lever 80 is pressed against the mating member W, the push lever 80 moves upward against the bias of the coil spring.

[0075] Therefore, by pressing the push lever 80 against the target material W, the push lever 80 can be moved from the protruding position to the pushing position. After that, when the pressing against the target material W is released, the push lever 80 is returned from the pushing position to the protruding position by the bias of the coil spring. In other words, the push lever 80 is an example of a movable part that can move in the longitudinal direction of the injection unit 3 between the protruding position and the pushing position.

[0076] Here, when the push lever 80 is in the pushed-in position (FIG. 7(b)), the controller 6 of the nail driver according to this embodiment allows the striking unit 20 to operate so as to strike the nail N. More specifically, the controller 6 allows the supply of power to the electric motor 41 only when the push lever 80 is in the pushed-in position.

[0077] That is, in a state where the operation of pressing the tip of the push lever 80 against the target material W is not performed, the driving operation is not executed even if other operations are performed.

[0078] Figure 8(a) is a vertical cross-sectional view showing the push lever 80 at the protruding position, and Figure 8(b) is a vertical cross-sectional view showing the push lever 80 at the depressed position.

[0079] Push lever 80 has a cover portion 81 that moves up and down along peripheral wall 70 of ejection unit 3, and cover portion 81 is provided with a window portion 82. As shown in Figures 7(a) and 8(a), cover portion 81 covers discharge port 72 of ejection unit 3 when push lever 80 is in the protruding position. Note that in this embodiment, discharge port 72 also passes through intersection portion 74 in the longitudinal direction of ejection unit 3.

[0080] 7(b) and 8(b), the window 82 communicates with the discharge port 72 of the ejection unit 3 when the push lever 80 is in the pushed-in position. From another perspective, when the push lever 80 moves from the extended position to the pushed-in position, the position of the window 82 and the position of the discharge port 72 coincide. As a result, the discharge port 72, which had been covered by the cover unit 81 until then, is opened, allowing the fragments 9a and 9b that have detached from the nail N1 to be discharged.

[0081] From another perspective, the discharge port 72 is opened only during the driving operation when there is a possibility that the fragments 9a and 9b may come off the nail N1, and is closed at other times. Therefore, the intrusion of foreign matter and dust into the injection path 50 is prevented or suppressed.

[0082] (Third embodiment) The work machine according to this embodiment is a nail driver having the same basic configuration as the nail driver according to the second embodiment. Therefore, a description of the configuration that is the same or substantially the same as the nail drivers according to the first and second embodiments will be omitted, and only the different configuration will be described below.

[0083] 9A and 9B are longitudinal cross-sectional views showing a push lever 90 of the nail driver according to the present embodiment. More specifically, the push lever 90 shown in Fig. 9A is in the extended position, and the push lever 90 shown in Fig. 9B is in the retracted position.

[0084] The push lever 90 has a cover portion 91 and a window portion 92 that are the same as or substantially the same as the cover portion 81 and the window portion 82 of the push lever 80. Furthermore, the push lever 90 has a magnet 93 arranged outside the window portion 92.

[0085] The magnet 93 is held in a position facing the window 92 by an arm 94 having an L-shaped cross section. Therefore, when the fragments 9a, 9b are discharged through the window 92, which is in communication with the discharge port 72, the fragments 9a, 9b are attracted to the magnet 93. As a result, scattering of the fragments 9a, 9b into the surrounding area is suppressed or prevented. In other words, the magnet 93 captures the metal pieces discharged through the discharge port 72 and the window 92, and suppresses or prevents them from scattering into the surrounding area.

[0086] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0087] 1A...nail gun, 2...housing, 3...ejection unit, 4...magazine unit, 5...battery pack, 6...controller, 7...shaft unit, 8a...upper wire, 8b...lower wire, 9a, 9b...fragments, 10...cylinder case, 11...motor case, 12...handle, 13...connection unit, 20...striking unit, 21...piston, 22...driver blade, 22a...rack, 30...activation unit, 31...cylinder, 32...chamber, 33...pressure chamber, 40...drive Moving part, 41...electric motor, 42...reduction gear, 43...pinwheel, 50...injection path, 61...storage part, 62...feeder, 63, 64...feed pawls, 70...periphery wall, 71...first opening (supply port), 71a...upper end, 72...second opening (discharge port), 72a...upper end, 73...groove, 74...intersection part, 80...push lever, 81...cover part, 82...window part, 90...push lever, 91...cover part, 92...window part, 93...magnet, 94...arm part

Claims

1. an injection section having an injection path; a striking section that is movable in the longitudinal direction of the ejection section; a biasing portion that moves the impact portion toward the tip end side of the injection portion to impact a stopper in the injection path; a magazine unit that accommodates a plurality of the fasteners, the injection section has a peripheral wall that forms the injection path, and a first opening and a second opening that penetrate the peripheral wall and connect the injection path to the outside of the peripheral wall, The stoppers housed in the magazine section are supplied to the ejection path through the first opening, The second opening is provided at a different position from the first opening in the circumferential direction of the injection path, and penetrates the peripheral wall in the longitudinal direction of the injection section.

2. The work machine according to claim 1, A work machine wherein an end of the second opening on the base end side of the injection part is located closer to a tip end side of the injection part than an end of the first opening on the base end side of the injection part.

3. The work machine according to claim 1, the peripheral wall of the injection portion includes an intersection portion extending in a direction intersecting with a longitudinal direction of the injection portion, The second opening penetrates the intersection portion in the longitudinal direction of the injection portion.

4. The work machine according to claim 3, The intersecting portion is inclined with respect to the longitudinal direction of the injection portion.

5. The work machine according to claim 3, an electric motor and a pinwheel that receive electric power to move the striking portion toward the base end of the ejection portion; The striking portion has a rack that engages with the pinwheel, the ejection unit has a groove provided on a movement path of the rack, The intersecting portion is provided at an end of the groove on the tip side of the injection portion.

6. The work machine according to claim 1, a movable portion that is movable in the longitudinal direction of the injection portion between a protruding position and a pushing position; The movable part covers the second opening when in the protruding position and opens the second opening when in the retracted position.

7. The work machine according to claim 6, The movable part has a cover part that covers the second opening when in the protruding position, and a window part that is provided on the cover part and communicates with the second opening when in the pushed-in position.

8. The work machine according to claim 7, A work machine having a magnet disposed outside the window portion and configured to capture metal pieces discharged through the second opening and the window portion.

9. The work machine according to claim 6, a control unit for controlling the operation of the striking unit; The control unit allows the striking unit to operate to strike the stopper when the movable unit is in the pushed-in position.

10. The work machine according to claim 1, the first opening is located on one side in the supply direction with respect to an axis of the injection path when viewed in the longitudinal direction of the injection portion, The second opening is located on one side of the axis of the injection path in a direction intersecting the supply direction when viewed in the longitudinal direction of the injection section.

11. an injection section having an injection path; a striking section that is movable in the longitudinal direction of the ejection section; a biasing portion that moves the impact portion toward the tip end side of the injection portion to impact a stopper in the injection path; a magazine unit that accommodates a plurality of the fasteners; a movable part that is movable in the longitudinal direction of the injection part between a protruding position and a pushing position; the injection section has a peripheral wall that forms the injection path, and a first opening and a second opening that penetrate the peripheral wall and connect the injection path to the outside of the peripheral wall, The stoppers housed in the magazine section are supplied to the ejection path through the first opening, the second opening is provided at a position different from the first opening in the circumferential direction of the injection path, and The movable part covers the second opening when in the protruding position and opens the second opening when in the retracted position.

Images