Work equipment and solenoids

Abstract

To improve the usability of the work equipment. [Solution] The driving machine has a striking section that strikes a fastener supplied to the injection section, a supply section that supplies the fastener to the injection section, and a solenoid 93 that drives the supply section. The solenoid 93 has a cylindrical stator 97 and a plunger 93d, the stator 97 has a cylindrical coil 93n and a yoke 93b having a contact section 93g that the plunger 93d contacts, the contact section 93g has a deepest surface 93i and a protruding section 93j. The protruding section 93j has a fixed-side first inclined surface 93k and a fixed-side second inclined surface 93m that connects to the fixed-side first inclined surface 93k from the opposite side of the deepest surface 93i and cooperates with the fixed-side first inclined surface 93k to define a fixed-side bulge section 93h.

Description

[Technical Field]

[0001] The present invention relates to a working machine and a solenoid. [Background Art]

[0002] As an example of a working machine, a nailing machine is known which includes an ejection part, a magazine that accommodates a plurality of fasteners, a feeder that supplies the fasteners from the magazine to the ejection part, and a striking part that strikes the fastener disposed in the ejection part.

[0003] For example, Patent Document 1 discloses a solenoid as a member for driving a feeder included in a nailing machine. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2025-6603 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] The nailing machine described in the above Patent Document 1 includes a solenoid for driving the feeder. In the nailing machine described above, it has been desired to improve convenience by reducing the size and weight of the solenoid.

[0006] However, if the number of turns of a coil is indiscriminately reduced or the plunger is downsized to reduce the size and weight of the solenoid, the suction force generated by the solenoid will decrease. When the suction force decreases, poor feeding of nails (fasteners) may occur, or the time required for nail feeding may increase, which may lead to a decrease in operability of the nailing machine.

[0007] Accordingly, it has been desired to optimize the shapes of the yoke that supports the coil and the plunger to improve the suction force, thereby realizing reduction in size and weight of the solenoid and improving the convenience of the nailing machine.

[0008] The objective of the present invention is to provide a work machine and solenoid with improved convenience. [Means for solving the problem]

[0009] A work machine according to one embodiment includes an injection unit for which fasteners are supplied, an impact unit for striking the fasteners supplied to the injection unit, a magazine unit for housing a plurality of fasteners wound in a roll, a supply unit for supplying the fasteners from the magazine unit to the injection unit, and a solenoid for driving the supply unit to supply the fasteners, wherein the solenoid includes a cylindrical stator and a plunger arranged to move to one side in the axial direction along the central axis of the stator when the stator is energized, and the stator includes a cylindrical coil and a plunger that supports the coil and moves when the stator is energized The device comprises a yoke having a contact portion against which the plunger abuts, the contact portion having a deepest surface that abuts against one end of the plunger in the axial direction, and a protruding portion that protrudes from the deepest surface to the other side in the axial direction, the protruding portion having a fixed-side first inclined surface inclined with respect to the central axis, and a fixed-side second inclined surface that is inclined with respect to the central axis such that the angle it makes with the central axis is greater than the angle made between the fixed-side first inclined surface and the central axis, and that connects to the fixed-side first inclined surface from the side opposite to the deepest surface, thereby cooperating with the fixed-side first inclined surface to define a fixed-side bulge.

[0010] Another embodiment of the work machine includes an injection unit for which fasteners are supplied, a striking unit for striking the fasteners supplied to the injection unit, a magazine unit for housing a plurality of fasteners wound in a roll, a supply unit for supplying the fasteners from the magazine unit to the injection unit, and a solenoid for driving the supply unit to supply the fasteners, wherein the solenoid includes a cylindrical stator and a plunger positioned to move to one side in the axial direction along the central axis of the stator when the stator is energized, and the plunger has a recess on the outer circumference of the end on one side in the axial direction defined by a plurality of surfaces including an inclined surface that is inclined with respect to the axial direction.

[0011] A solenoid according to one embodiment includes a cylindrical stator and a plunger positioned to move to one side in the axial direction along the central axis of the stator when the stator is energized, wherein the stator includes a cylindrical coil and a yoke that supports the coil and has a contact portion against which the plunger abuts when the stator is energized, wherein the contact portion has a deepest surface that abuts against one end of the plunger in the axial direction and a protruding portion that protrudes to the other side in the axial direction from the deepest surface, wherein the protruding portion has a fixed-side first inclined surface that is inclined with respect to the central axis and a fixed-side second inclined surface that is inclined with respect to the central axis such that the angle between the fixed-side first inclined surface and the central axis is greater than the angle between the fixed-side first inclined surface and the central axis, and that connects to the fixed-side first inclined surface from the side opposite to the deepest surface, thereby cooperating with the fixed-side first inclined surface to define a fixed-side bulge. [Effects of the Invention]

[0012] According to the present invention, the convenience of the work machine can be improved. [Brief explanation of the drawing]

[0013] [Figure 1] This is a right-side view showing the structure of a work machine according to an embodiment of the present invention. [Figure 2] This is a right-side view showing the structure of the work machine with the solenoid cover removed (Figure 1). [Figure 3] Figure 1 is a side cross-sectional view showing the internal structure of the work machine. [Figure 4] This is a cross-sectional view showing the structure cut along line AA in Figure 1. [Figure 5] Figure 1 is a schematic diagram showing the initial position of the plunger in the solenoid of the work machine. [Figure 6] This is a magnified view of section B in Figure 5. [Figure 7] Figure 5 is a magnified view of the plunger and yoke in a solenoid. [Figure 8]FIG. 5 is a schematic diagram showing the position of the plunger of the solenoid when moved by 2 mm. [Figure 9] It is a schematic diagram showing the position of the plunger of the solenoid in FIG. 5 when moved by 4 mm. [Figure 10] It is a schematic diagram showing the position of the plunger of the solenoid in FIG. 5 when moved by 7.4 mm. [Figure 11] It is a schematic diagram showing the position of the plunger of the solenoid in FIG. 5 when moved by 11.3 mm. [Figure 12] It is a schematic diagram showing the structure of the plunger and the yoke in the solenoid of the working machine in FIG. 1. [Figure 13] It is an enlarged view showing the detailed structure of the plunger in FIG. 12. [Figure 14] It is a schematic diagram showing the structure of the plunger and the yoke in the solenoid of Comparative Example 1. [Figure 15] It is an enlarged view showing the detailed structure of the plunger in FIG. 14. [Figure 16] It is a schematic diagram showing the structure of the plunger and the yoke in the solenoid of Comparative Example 2. [Figure 17] It is an enlarged view showing the detailed structure of the yoke in FIG. 16. [Figure 18] It is a schematic diagram showing the structure of the plunger and the yoke in the solenoid of Comparative Example 3. [Figure 19] It is an enlarged view showing the detailed structure of the yoke in FIG. 18. [Figure 20] It is a graph showing the relationship between the plunger movement amount and the suction force in the solenoid of FIG. 5 and the solenoid of Comparative Example 1. [Figure 21] It is a graph showing the relationship between the plunger movement amount and the suction force in the solenoid of FIG. 5 and the solenoids of Comparative Examples 2 and 3. [Figure 22] It is a schematic diagram showing the magnetic flux density at the initial position of the plunger of the solenoid in FIG. 5. [Figure 23] It is a schematic diagram showing the magnetic flux density at the position of the plunger of the solenoid in FIG. 5 when moved by 2 mm. [Figure 24]Figure 5 is a schematic diagram showing the magnetic flux density at the position when the solenoid plunger is moved 4 mm. [Figure 25] Figure 5 is a schematic diagram showing the magnetic flux density at the position when the solenoid plunger moves 7.4 mm. [Figure 26] Figure 5 is a schematic diagram showing the magnetic flux density at the position when the solenoid plunger moves 11.3 mm. [Modes for carrying out the invention]

[0014] The nail driving machine (working machine) 10 shown in Figures 1 to 4 is an air-compression type working machine, sometimes called a nail gun. The nail driving machine 10 has a housing 11, a striking section 12, an injection section 13, a power supply section 14, an electric motor 15, a reduction gear mechanism 16, a winding mechanism 17, and a pressure accumulator 18. As shown in Figures 1 to 3, the housing 11 is the outer shell element of the nail driving machine 10 and has a cylinder case 19, a handle 20, a motor case 21, and a mounting section 22. The cylinder case 19 is cylindrical in shape, and the handle 20 and the motor case 21 are connected to the cylinder case 19.

[0015] In this embodiment, the direction in which the cylinder case 19 extends is defined as the vertical direction M1, and the direction perpendicular to the vertical direction M1 is defined as the left-right direction R1. Furthermore, the direction perpendicular to the vertical direction M1 and the left-right direction R1, in which the motor case 21 extends, is defined as the front-rear direction N1.

[0016] The work machine of this embodiment is a roll magazine type nail driving machine 10. That is, the magazine section 90 of the nail driving machine 10 is capable of storing multiple connected fasteners, which are nails 78, in a roll shape inside, and includes a drum-shaped canister (storage section) 90a.

[0017] The mounting portion 22 of the driving machine 10 is connected at one end to the handle 20 and at the other end via the extension portion 21a to the motor case 21. The rear portion of the magazine portion 90 is supported by one end of the mounting portion 22 and is located below the extension portion 21a and the mounting portion 22.

[0018] The housing 11 has a two-part structure, consisting of a right-side housing 11 and a left-side housing 11. The right-side housing 11 and the left-side housing 11 are positioned opposite each other, and the two housings 11 are assembled together and fixed in place by multiple screws.

[0019] Furthermore, a head cover 25 is attached to the cylinder case 19, and a pressure accumulator 18 having a cap 23 is arranged within the cylinder case 19 and the head cover 25. In addition, a cylinder 27 is housed within the cylinder case 19. The cylinder 27 is made of metal, for example, aluminum or iron. A pressure chamber 26 is formed within the pressure accumulator 18 and the cylinder 27. The pressure chamber 26 is filled with compressed gas. The pressure chamber 26 also acts as a biasing part that biases the striking part 12 downward in the vertical direction M1 by the compressed gas.

[0020] As shown in Figure 3, the striking section 12 is positioned from the inside to the outside of the housing 11 and has a piston 28 and a driver blade 29. The piston 28 is movable in the vertical direction M1 within the cylinder 27. The piston 28 and the driver blade 29 are provided as separate components and are connected to each other. As a result, the striking section 12 can strike the nail (fastener) 78 by moving downward in the vertical direction M1.

[0021] The injection unit 13 includes a portion into which nails 78 are supplied and a nose portion 32 that supports the cylinder 27. The driver blade 29 is positioned within a guide hole in the bumper support portion 31 and within a guide hole 36 in the bumper 35. The striking unit 12 is actuated in a vertical direction M1 and strikes the nails 78 supplied to the injection unit 13. The striking unit 12 is constantly biased downward by the pressure of the compressed gas in the pressure chamber 26. The injection unit 13 has an injection passage 37 into which the nails 78 are positioned, and the injection passage 37 is provided along a vertical direction M1. The driver blade 29 is actuated in a vertical direction M1 within the injection passage 37.

[0022] Furthermore, an electric motor 15 is located inside the motor case 21, and a reduction mechanism 16 is also provided. The reduction mechanism 16 is equipped with multiple sets of planetary gear mechanisms and is a mechanism that reduces the input element from the electric motor 15 in the power transmission path and outputs it. The power of the electric motor 15 is reduced by the reduction mechanism 16 and transmitted to the hoisting mechanism 17. In addition, the rotational force of the rotating shaft of the electric motor 15 is converted by the hoisting mechanism 17 into a force that biases the striking part 12 upward in the vertical direction M1. Specifically, the hoisting mechanism 17 is equipped with a pin wheel 50 that engages with the driver blade 29, and the pin wheel 50 rotates with the power of the electric motor 15. That is, the pin wheel 50 rotates with the power of the electric motor 15, and the rotation of the pin wheel 50 pushes the driver blade 29 upward in the vertical direction M1 after it has been driven in. The pin wheel 50 is provided in the pin wheel housing section 33.

[0023] Furthermore, as shown in Figures 3 and 4, the magazine section 90 is supported at its front end by the nose section 32 via the feeder 96, and at its rear end by the mounting section 22. The magazine section 90 has a drum-shaped canister 90a, a magazine cover 90n, and a lid section 90j that covers the canister 90a, and houses a plurality of connected nails 78 (see Figure 1) in a roll shape in the roll nail storage section 90m inside the canister 90a. The plurality of nails 78 are connected to each other by connecting elements such as adhesive or wire, and these connected nails 78 are arranged inside the canister 90a so that they are wound in a roll shape and wrapped around the shaft section 90k of the roll nail storage section 90m of the canister 90a. In other words, a plurality of nails 78 that are connected to each other by connecting elements and wound in a roll shape are housed in the roll nail storage section 90m of the canister 90a of the magazine section 90. The multiple nails 78 connected by the above-mentioned connecting element are then fed out of the canister 90a and sent by the feeder 96 to the injection passage 37 of the injection unit 13.

[0024] The injection unit 13 is equipped with a dial-type adjuster 52 for adjusting the driving depth of the nails 78 by the nail driving machine 10. In other words, the operator can adjust the driving depth of the nails 78 by the nail driving machine 10 by turning the adjuster 52 during the nail driving operation.

[0025] Furthermore, a push lever 79 is attached to the nose portion 32. The push lever 79 can be operated within a predetermined range of vertical M1 relative to the nose portion 32. The push lever 79 is a switch component. Specifically, it can move from a first position (switch-off position) to a second position (switch-on position) by contacting a mating material. The push lever 79 is constantly biased downward in the vertical direction M1 by an elastic member (not shown). Therefore, when the tip of the push lever 79 is not pressed against a mating material, it is always in the first position (switch-off position). On the other hand, when the tip of the push lever 79 is pressed against a mating material and moves to a predetermined position (second position) above the first position, it switches on.

[0026] The driving machine 10 is also equipped with a trigger 53 and a trigger sensor 85. The trigger 53 and trigger sensor 85 are located on the handle 20. The trigger sensor 85 detects whether or not there is an operating force applied to the trigger 53 and outputs a signal according to the detection result.

[0027] Furthermore, the controller (control unit) 82 of the driving machine 10 is located within the mounting section 22 and primarily controls the drive of the electric motor 15. The controller 82 has a microprocessor. In addition, a circuit board with an inverter circuit is provided inside the motor case 21. The inverter circuit has multiple switching elements, each of which can be switched on or off. By controlling the inverter circuit, the controller 82 controls the rotation and stopping of the electric motor 15, as well as the rotation speed and rotation direction of the electric motor 15.

[0028] The power supply unit 14, which supplies power to the electric motor 15, can be attached to and detached from the mounting unit 22. The power supply unit 14 has a housing case 76 and a battery housed in the housing case 76. The battery has a plurality of battery cells. These battery cells are rechargeable and dischargeable secondary batteries, and any known battery cells such as lithium-ion batteries, nickel-metal hydride batteries, lithium-ion polymer batteries, nickel-cadmium batteries, etc., can be used.

[0029] Next, an example of the operation of the driving machine 10 of this embodiment will be described. When the controller 82 detects that no operating force is being applied to the trigger 53, or that the push lever 79 is not being pressed against the workpiece, it stops supplying power to the electric motor 15. As a result, the electric motor 15 stops, and the striking unit 12 stops in the standby position.

[0030] When the controller 82 detects that operating force is applied to the trigger 53 and that the push lever 79 is pressed against the workpiece, it applies voltage from the power supply unit 14 to the electric motor 15, causing the electric motor 15 to rotate in the forward direction. This starts the driving operation. In other words, unless the controller 82 detects both that operating force is applied to the trigger 53 and that the push lever 79 is pressed against the workpiece, it will not output a signal to apply voltage from the power supply unit 14 to the electric motor 15, and will not start the driving operation.

[0031] The electric motor 15 starts when the driving operation begins. The rotational force of the electric motor 15 is transmitted to the pin wheel 50 via the reduction mechanism 16. When the pin wheel 50 rotates in a predetermined direction, the striking part 12 rises. When the striking part 12 rises, the gas pressure in the pressure chamber 26 increases.

[0032] When the final pin of the pinwheel 50 rotates in a predetermined direction and separates from the final rack of the driver blade 29, the striking section 12 descends due to the gas pressure in the pressure chamber 26. As the striking section 12 descends due to the gas pressure in the pressure chamber 26, the driver blade 29 strikes a single nail 78 located in the injection passage 37, and the nail 78 is driven into the mating material.

[0033] Next, the supply unit 91 that sends the nails 78 to the injection unit 13 will be described. The supply unit 91 is the part that supplies the nails 78 from the magazine unit 90 to the injection unit 13. As shown in Figure 4, the supply unit 91 is provided with a solenoid 93 that drives the supply unit 91 to supply the nails 78 shown in Figure 1. In detail, the supply unit 91 has a plunger 93d that moves forward and backward in the front-rear direction N1, a solenoid 93 that operates the plunger 93d by the application of power, a feeder arm 96a that reciprocates with the plunger 93d, a feeder 96 that reciprocates with the feeder arm 96a and feeds the leading nail 78 to the injection unit 13, and a spring 93e that biases the feeder arm 96a.

[0034] As a result, when the power supply to the solenoid 93 is turned OFF, the feeder 96 is biased forward in the longitudinal direction N1 via the feeder arm 96a by the biasing force of the spring 93e, and the plunger 93d moves forward. At that time, the feeder arm 96a moves forward along with the movement of the plunger 93d, and furthermore, the feeder 96 also moves forward together with the feeder arm 96a to feed the leading nail 78 to the injection unit 13.

[0035] Furthermore, when power is supplied to the solenoid 93, the plunger 93d is attracted by the solenoid 93, moving the plunger 93d backward in the front-rear direction N1. At this time, as the plunger 93d moves backward, the feeder arm 96a is moved backward against the biasing force of the spring 93e, and together with the feeder arm 96a, the feeder 96 is also moved backward and positioned behind the second nail 78. As a result, the feeder 96 waits behind the second nail 78. The supply unit 91, including the solenoid 93, is covered by a bowl-shaped solenoid cover 93a, as shown in Figures 1 and 4.

[0036] Next, the solenoid 93 of this embodiment will be described using Figures 4 to 7. First, the structure of the solenoid 93 will be described.

[0037] As shown in Figure 4, the solenoid 93 is provided with two externally exposed terminals 93f. One of the two terminals 93f is the positive terminal 93f, and the other is the negative terminal 93f.

[0038] Furthermore, the solenoid 93 has a disc-shaped holder 93c (see Figure 2) attached to the terminal 93f side. The holder 93c is a resin component molded integrally with the two terminals 93f. In other words, the holder 93c is a disc-shaped component formed by resin molding integrally with the two terminals 93f. As a result, the two terminals 93f that protrude outward along the thickness direction of the holder 93c are embedded in the resin disc-shaped holder 93c.

[0039] As shown in Figure 3, the driving machine 10 is provided with a wiring harness 38, one end of which is connected to the controller 82 and the other end of which is connected to the terminal 93f of the solenoid 93. In other words, the driving machine 10 has a wiring harness 38 that can be connected to the terminal 93f of the solenoid 93. This wiring harness 38 is provided with a connector 95 that is fitted onto the terminal 93f of the solenoid 93. The connector 95 can be easily attached to and detached from the terminal 93f of the solenoid 93.

[0040] Furthermore, as shown in Figure 4, the magazine section 90 includes a cylindrical canister 90a for housing a plurality of nails 78 (see Figure 1), a passage section 90b for supplying the nails 78 from the canister 90a to the injection section 13, and a solenoid cover 93a. The magazine section 90, including the canister 90a, the passage section 90b, and the solenoid cover 93a, is connected to the motor case 21 of the housing 11, as shown in Figure 1, and the wiring 38 is routed from the solenoid cover 93a into the motor case 21 of the housing 11 without going through the canister 90a. That is, the wiring 38 connected to the terminal 93f of the solenoid 93 is routed into the motor case 21 of the housing 11 without going through the canister 90a, and is further routed to the mounting section 22 via the extension section 21a and connected to the controller 82.

[0041] Furthermore, as a dustproofing measure for the solenoid 93, the supply unit 91 is provided with a plate-shaped tail cover 92 connected to the injection unit 13, and a solenoid cover 93a assembled to the tail cover 92, housing the solenoid 93 and feeder 96 between the tail cover 92 and the supply unit 91. In other words, the solenoid cover 93a and the like are provided as a dustproofing measure for the solenoid 93, and cover the supply unit 91, including the solenoid 93 and feeder 96, together with the tail cover 92 and magazine cover 90n.

[0042] As shown in Figures 5 and 6, the solenoid 93 includes a cylindrical stator 97 and a rod-shaped plunger 93d arranged to move to one side in the axial direction B1 along the central axis A1 of the stator 97 when the stator 97 is energized. The plunger 93d in this embodiment is tapered. The stator 97 also includes a cylindrical coil 93n and a yoke 93b that supports the coil 93n and has a contact portion 93g against which the plunger 93d abuts when the stator 97 is energized. In other words, the plunger 93d is a movable member. In contrast, the yoke 93b is a fixed member against which the plunger 93d abuts. The coil 93n supported by the yoke 93b is, for example, a cylindrical member made by winding a thin metal wire.

[0043] Here, the yoke 93b, which is provided as the stator 97, will be described. The yoke 93b is cylindrical and made of metal. The yoke 93b houses a coil 93n connected to a terminal 93f inside. The yoke 93b consists of a cylindrical outer wall 93bb, a cylindrical inner wall 93bc, a cover portion 93ba that closes the opening on one side of the outer wall 93bb and the inner wall 93bc, and a contact portion 93g that closes the opening on the other side of the outer wall 93bb and the inner wall 93bc.

[0044] The contact portion 93g of the yoke 93b has a deepest surface 93i that contacts one end 93z of the plunger 93d in the axial direction B1, and a protruding portion 93j that protrudes from the deepest surface 93i to the other side in the axial direction B1. The deepest surface 93i is the surface of the contact portion 93g of the yoke 93b that abuts against the end surface 93p of the end 93z of the plunger 93d. The protruding portion 93j is a protruding part of the contact portion 93g that is provided in an annular shape along the inner circumferential wall 93bc of the yoke 93b. The protruding portion 93j has a fixed-side first inclined surface 93k that is inclined with respect to the central axis A1. Furthermore, the protruding portion 93j is inclined with respect to the central axis A1 such that the angle it makes with the central axis A1 is greater than the angle it makes with the fixed-side first inclined surface 93k and the central axis A1, and it has a fixed-side second inclined surface 93m that connects to the fixed-side first inclined surface 93k from the side opposite to the deepest surface 93i, thereby working in cooperation with the fixed-side first inclined surface 93k to define the fixed-side bulge portion 93h.

[0045] In other words, the annular projection 93j has a fixed-side first inclined surface 93k positioned closer to the central axis A1 than the inner circumferential wall 93bc, and a fixed-side second inclined surface 93m connected to the fixed-side first inclined surface 93k on the other side of the fixed-side first inclined surface 93k in the axial direction B1. If the surface connecting the fixed-side first inclined surface 93k and the deepest surface 93i is called the third inclined surface 99b, then the fixed-side first inclined surface 93k, the fixed-side second inclined surface 93m, and the third inclined surface 99b are all surfaces inclined with respect to the central axis A1, and the inclination angle of each of these inclined surfaces with respect to the central axis A1 is greater than 0° and less than 90°.

[0046] The fixed-side bulge 93h is formed at the point where the fixed-side first inclined surface 93k and the fixed-side second inclined surface 93m are connected, and is a portion that bulges inward toward the yoke 93b (toward toward the plunger 93d).

[0047] Next, we will explain in detail the plunger 93d of the solenoid 93.

[0048] The solenoid 93 has a long, slender rod-shaped plunger 93d that is attracted into the solenoid 93. The plunger 93d is the part of the supply unit 91 that supplies nails 78 to the injection unit 13. For example, when the power supply to the solenoid 93 shown in Figure 4 is OFF, the feeder 96 is biased forward via the feeder arm 96a by the biasing force of the spring 93e, and the plunger 93d moves forward. At that time, the feeder arm 96a moves forward along with the movement of the plunger 93d, and furthermore, the feeder 96 also moves forward together with the feeder arm 96a to feed the leading nail 78 to the injection unit 13.

[0049] On the other hand, when the power supply to the solenoid 93 is turned ON, the plunger 93d is attracted by the solenoid 93, moving the plunger 93d backward. In other words, a portion of the plunger 93d is housed within the solenoid 93. At this time, as the plunger 93d moves backward, the feeder arm 96a is moved backward against the biasing force of the spring 93e, and furthermore, the feeder 96 is also moved backward together with the feeder arm 96a and positioned behind the second nail 78. As a result, the feeder 96 waits behind the second nail 78.

[0050] The plunger 93d of this embodiment has an end face 93p located at one end 93z in the axial direction B1, as shown in Figures 5 to 7. Furthermore, the plunger 93d has a movable adjacent surface 93q that has an angle with the central axis A1 smaller than the angle between the end face 93p and the central axis A1, is located inside the fixed-side first inclined surface 93k in the radial direction C1 of the stator 97, and is connected to the end face 93p, thereby cooperating with the end face 93p to define the movable-side bulge 93r.

[0051] The adjacent movable surface 93q is a surface that is inclined with respect to the central axis A1.

[0052] Furthermore, the plunger 93d is parallel to the fixed-side first inclined surface 93k, inclined with respect to the central axis A1 such that the angle it makes with the central axis A1 is smaller than the angle made between the movable-side adjacent surface 93q and the central axis A1, and has a movable-side first inclined surface 93s that contacts the fixed-side first inclined surface 93k when the stator 97 is energized.

[0053] In other words, the movable first inclined surface 93s is a surface parallel to the fixed first inclined surface 93k of the projection 93j of the yoke 93b, and is the surface that abuts against the fixed first inclined surface 93k of the projection 93j when the plunger 93d is attracted to the yoke 93b when the stator is energized.

[0054] Furthermore, the plunger 93d is parallel to the fixed-side second inclined surface 93m, inclined with respect to the central axis A1 such that the angle it makes with the central axis A1 is greater than the angle made between the movable-side first inclined surface 93s and the central axis A1, and has a movable-side second inclined surface 93t that contacts the fixed-side second inclined surface 93m when the stator 97 is energized.

[0055] In other words, the movable second inclined surface 93t is a surface parallel to the fixed second inclined surface 93m of the projection 93j of the yoke 93b, and is the surface that abuts against the fixed second inclined surface 93m of the projection 93j when the plunger 93d is attracted to the yoke 93b when the stator is energized.

[0056] Here, if we define the movable adjacent surface 93q of the plunger 93d as the third inclined surface 99a, then the movable first inclined surface 93s, the movable second inclined surface 93t, and the third inclined surface 99a are formed on the outer circumference of the tip on one side in the axial direction B1 of the plunger 93d. The movable first inclined surface 93s, the movable second inclined surface 93t, and the third inclined surface 99a are all surfaces inclined with respect to the central axis A1, and the inclination angle of each of these inclined surfaces with respect to the central axis A1 is greater than 0° and less than 90°.

[0057] The movable bulge portion 93r is provided at the point where the third inclined surface 99a and the end surface 93p connect, and is a portion that bulges toward the contact portion 93g of the yoke 93b.

[0058] In this way, the plunger 93d has a movable first inclined surface 93s, a movable second inclined surface 93t, and a third inclined surface 99a formed on its outer circumference, which increases the diameter of the outer circumference portion of the end and thus increases the volume of the outer circumference portion of the end. As a result, the suction force can be increased at all positions during the movement of the plunger 93d.

[0059] As shown in Figures 6 and 7, the plunger 93d has multiple movable contact surfaces 93u that make contact with the contact portion 93g when the stator 97 is energized, with each surface having a different angle with respect to the central axis A1. Specifically, the plunger 93d has multiple movable contact surfaces 93u that make contact with respect to the central axis A1. These multiple movable contact surfaces 93u then come into contact with the contact portion 93g of the yoke 93b when the plunger 93d is attracted to the yoke 93b when the stator is energized.

[0060] In other words, the plunger 93d has a recess 98 on the outer circumference of one end in the axial direction B1, which is defined by a plurality of surfaces 98b, including an inclined surface 98a that is inclined with respect to the axial direction B1. For example, the recess 98 is the part where the movable first inclined surface 93s and the movable second inclined surface 93t connect, and is defined by two inclined surfaces 98b. This makes it possible to increase the volume of the plunger 93d in the area of ​​the two inclined surfaces 98b, thereby increasing the overall suction force.

[0061] Furthermore, the plunger 93d has a curved radius portion (arc portion) 93v that smoothly connects adjacent movable contact surfaces 93u among the multiple movable contact surfaces 93u.

[0062] On the plunger 93d side, the rounded portion 93v is formed as a rounded portion (arc portion) 93va connecting the end face 93p (movable side contact surface 93u) and the third inclined surface 99a (movable side contact surface 93u), and a rounded portion (arc portion) 93vb connecting the third inclined surface 99a (movable side contact surface 93u) and the movable side first inclined surface 93s (movable side contact surface 93u). On the other hand, on the yoke 93b side, the rounded portion 93v is formed as a rounded portion (arc portion) 93vc connecting the fixed side first inclined surface 93k (movable side contact surface 93u) and the fixed side second inclined surface 93m (movable side contact surface 93u).

[0063] Then, as shown in Figure 7, when the plunger 93d is attracted to the yoke 93b when the stator is energized, multiple movable contact surfaces 93u of the plunger 93d come into contact with the contact portion 93g of the yoke 93b. Specifically, the first movable inclined surface 93s of the plunger 93d comes into contact with the first fixed inclined surface 93k of the yoke 93b, and the second movable inclined surface 93t of the plunger 93d comes into contact with the second fixed inclined surface 93m of the yoke 93b. Furthermore, the third inclined surface 99a of the plunger 93d comes into contact with the third inclined surface 99b of the yoke 93b, and the end face 93p of the plunger 93d comes into contact with the deepest surface 93i of the yoke 93b. At this time, neither the rounded portion 93va nor the rounded portion 93vb of the plunger 93d come into contact with the contact portion 93g of the yoke 93b.

[0064] In other words, when the tip of the plunger 93d comes into contact with the contact portion 93g of the yoke 93b, the curved portions 93va and 93vb of the plunger 93d do not come into contact with the contact portion 93g of the yoke 93b.

[0065] Next, the contact portion 93g of the yoke 93b, which the plunger 93d abuts against, will be described. The contact portion 93g has a deepest surface 93i which the end face 93p of the plunger 93d abuts against. This deepest surface 93i is located on one side (rear) of the axial direction B1 than the coil 93n supported by the yoke 93b. In other words, the deepest surface 93i is formed in the yoke 93b at a position that protrudes on one side (rear) of the axial direction B1 than the coil 93n.

[0066] Further, the contact portion 93g is provided with a protruding portion 93j that protrudes toward the other (front) side in the axial direction B1 and has a fixed-side first inclined surface 93k and a fixed-side second inclined surface 93m formed thereon. As shown in Fig. 6, at least a part D1 of the protruding portion 93j is located on the other (front) side in the axial direction B1 relative to the coil 93n. In other words, in the protruding portion 93j provided on the contact portion 93g, a part D1 thereof overlaps the coil 93n in the axial direction B1.

[0067] Here, as shown in Fig. 7, the contact portion 93g of the yoke 93b includes: a central portion 93w provided with a deepest surface 93i; and an adjacent portion 93x disposed adjacent to the central portion 93w on the outer side of the central portion 93w in the radial direction C1 of the stator 97 and provided with the protruding portion 93j. Further, the contact portion 93g is disposed adjacent to the adjacent portion 93x on the outer side of the adjacent portion 93x in the radial direction C1 of the stator 97, and has an outer edge portion 93y at least a part of which overlaps the coil 93n in the axial direction B1. That is, the contact portion 93g includes the central portion 93w provided with the deepest surface 93i, the adjacent portion 93x provided with the protruding portion 93j, and the outer edge portion 93y having a portion overlapping the coil 93n. In the adjacent portion 93x, the thickness T1 in the axial direction B1 is larger than the thickness T2 of the outer edge portion 93y (T1>T2). That is, the thickness T1 of the adjacent portion 93x is larger than the thickness T2 of the outer edge portion 93y.

[0068] Further, in the central portion 93w, the thickness T3 in the axial direction B1 is smaller than the thickness T2 of the outer edge portion 93y (T3<T2). That is, the thickness T3 of the central portion 93w is smaller than the thickness T2 of the outer edge portion 93y. Therefore, in the contact portion 93g, the thickness T3 of the central portion 93w is the smallest, and the thickness T1 of the adjacent portion 93x is the largest (T1>T2>T3).

[0069] In other words, since there is no need to pass magnetic flux through the central part 93w, the thickness T3 of the central part 93w can be reduced, allowing the solenoid 93 to be miniaturized. On the other hand, the adjacent part 93x needs to have a protrusion 93j, so its thickness T1 needs to be increased. Furthermore, since there is no need to have a protrusion 93j in the outer edge part 93y, its thickness T2 is thinner than that of the adjacent part 93x.

[0070] Next, we will explain the positional relationship between the plunger 93d and the yoke 93b in the solenoid 93. Figure 5 shows the initial position of the plunger 93d, with the power supply to the solenoid 93 turned OFF, and no attraction of the plunger 93d by the yoke 93b occurring at all.

[0071] Figure 8 shows the position of the plunger 93d immediately after the power supply to the solenoid 93 is turned ON and the suction of the plunger 93d by the yoke 93b begins. The plunger 93d has moved 2 mm from its initial position toward the contact portion 93g. Because this is immediately after the suction of the plunger 93d by the yoke 93b has begun, the plunger 93d is slightly closer to the contact portion 93g of the yoke 93b.

[0072] Figure 9 shows the plunger 93d being attracted by the yoke 93b, and the plunger 93d has moved 4 mm from its initial position toward the contact portion 93g. The end face 93p of the plunger 93d is located near the middle of the yoke 93b, and the end face 93p is close to the contact portion 93g. In other words, in this state, the suction force is increased due to the attraction between the fixed-side bulge 93h of the yoke 93b and the movable-side bulge 93r of the plunger 93d.

[0073] Figure 10 shows the plunger 93d being attracted by the yoke 93b, and the plunger 93d has moved 7.4 mm from its initial position toward the contact portion 93g. The movable bulge 93r of the plunger 93d has passed the fixed bulge 93h of the yoke 93b, and the plunger 93d is being attracted to the yoke 93b by a large suction force.

[0074] Figure 11 shows the plunger 93d, attracted by the yoke 93b, striking the contact portion 93g. In this state, the plunger 93d has moved 11 mm from its initial position, and after moving 7.4 mm, the magnetic flux saturates and the attractive force weakens.

[0075] Next, Figures 12 to 19 compare the shapes of the plunger 93d and yoke 93b of the present invention with the shapes of the plunger 100 and yoke 101 of Comparative Examples 1, 2, and 3.

[0076] Figures 12 and 13 show the main features of the shape of the plunger 93d and the shape of the yoke 93b according to the present invention. Specifically, a movable first inclined surface 93s, a movable second inclined surface 93t, and a third inclined surface 99a are formed on the outer circumference of the end of the plunger 93d. The formation of the movable first inclined surface 93s and the movable second inclined surface 93t allows the diameter near the outer circumference of the end of the plunger 93d to be increased.

[0077] Furthermore, the yoke 93b is provided with a projection 93j on the contact portion 93g against which the plunger 93d abuts, and the projection 93j has a fixed-side first inclined surface 93k that abuts against the movable-side first inclined surface 93s of the plunger 93d. By forming the fixed-side first inclined surface 93k on the projection 93j of the yoke 93b, the width of the radial C1 of the projection 93j can be increased.

[0078] Furthermore, the contact portion 93g of the yoke 93b has a deepest surface 93i that contacts the end face 93p of the plunger 93d, and this deepest surface 93i is located on one side (rear) of the axial direction B1 than the coil 93n supported by the yoke 93b.

[0079] In contrast, in the plunger 100 of Comparative Example 1 shown in Figures 14 and 15, although an inclined surface 100b connected to the end face 100a is formed on the outer circumference of its end, a first surface 100c parallel to the central axis A1 and a second surface 100d perpendicular to the central axis A1 are provided at the locations corresponding to the movable first inclined surface 93s and movable second inclined surface 93t of the plunger 93d. As a result, the diameter of the plunger 100 cannot be increased at the locations of the first surface 100c and the second surface 100d. Therefore, the plunger 93d of the present invention has a larger diameter near the outer circumference of its end compared to the plunger 100 of Comparative Example 1.

[0080] Thus, in the plunger 93d of the present invention, by providing a movable first inclined surface 93s and a movable second inclined surface 93t, the diameter of the plunger 93d can be increased to lower the magnetic flux density and suppress magnetic flux saturation. As a result, the attractive force of the solenoid 93 can be improved regardless of the position of the plunger 93d relative to the yoke 93b.

[0081] This is shown in the relationship diagram between plunger movement and suction force in Figure 20. In other words, regardless of the magnitude of the plunger movement, the solenoid 93 of the present invention has a greater suction force than the solenoid 102 of Comparative Example 1.

[0082] Furthermore, in the yoke 101 of the solenoid 102 of Comparative Example 2 shown in Figures 16 and 17, a first surface 101b parallel to the central axis A1 is formed on the projection 101a provided on the yoke 101 at a location corresponding to the fixed-side first inclined surface 93k of the yoke 93b of the present invention. In addition, an inclined surface 101c is formed that connects to the first surface 101b. However, in the yoke 101 of Comparative Example 2, the first surface 101b is not an inclined surface, and it is not possible to form a bulge like the fixed-side bulge 93h (see Figure 6) of the yoke 93b of the present invention at the connection point between the first surface 101b and the inclined surface 101c. Therefore, it is not possible to increase the diameter C1 in the radial direction of the projection 101a in the yoke 101.

[0083] As a result, as shown in the relationship diagram between plunger movement and suction force in Figure 21, the solenoid 93 of the present invention exerts a greater suction force than the solenoid 102 of Comparative Example 2 when the plunger movement is between 0 and 7.4 mm.

[0084] Furthermore, in the yoke 101 of the solenoid 102 of Comparative Example 3 shown in Figures 18 and 19, an inclined surface 101d is formed on the projection 101a provided on the yoke 101 at a location corresponding to the fixed-side first inclined surface 93k of the yoke 93b of the present invention. However, the second surface 101e connected to the inclined surface 101d is not an inclined surface, but a surface perpendicular to the central axis A1. As a result, the length of the yoke 101 in the direction along the axial direction B1 is much shorter than that of the projection 93j of the yoke 93b of the present invention. Therefore, the portion of the projection 101a that overlaps with the coil 93n at the tip in the axial direction B1 is smaller than that of the projection 93j of the present invention.

[0085] As a result, as shown in the relationship diagram between plunger movement and suction force in Figure 21, in the range where the plunger movement is less than 7.4 mm, the solenoid 93 of the present invention has a greater suction force than the solenoid 102 of Comparative Example 3.

[0086] Next, Figures 22 to 26 show the magnetic flux density and magnetic flux flow (hereinafter also referred to as magnetic flux flow) for the solenoid 93 of the present invention when the plunger travel is 0 mm, 2 mm, 4 mm, 7.4 mm, and 11 mm. In the figures, the dots represent the magnetic flux density, and a higher dot density indicates a higher magnetic flux density. In addition, each arrow represents the direction of magnetic flux flow, and the thickness of each arrow represents the magnitude of the magnetic flux density.

[0087] In Figure 22, when the plunger movement is 0 mm (initial position), the magnetic flux density shown in magnetic flux flows E1, E2, E3, E4, E5 is generally low, but the magnetic flux density is relatively high near the movable first inclined surface 93s and movable second inclined surface 93t of the plunger 93d, and the magnetic flux density at the protrusion 93j of the yoke 93b is even higher. In Figure 23, when the plunger movement is 2 mm, the magnetic flux density shown in magnetic flux flows E1, E2, E3, E4, E5 begins to increase slightly overall as the plunger 93d moves slightly closer to the contact portion 93g of the yoke 93b. In Figure 24, when the plunger movement is 4 mm, the magnetic flux density shown in magnetic flux flows E1, E2, E3, E4, E5 increases as the plunger 93d moves closer to the protrusion 93j of the yoke 93b. In particular, the magnetic flux density at the plunger 93d is high. In Figure 25, when the plunger travel is 7.4 mm, the plunger 93d is approaching the protrusion 93j of the yoke 93b, and the magnetic flux density shown in magnetic flux flows E1, E2, E3, E4, E5 is generally high for both the plunger 93d and the yoke 93b. In Figure 26, when the plunger travel is 11 mm, the plunger 93d is in contact with the contact portion 93g of the yoke 93b. As shown above, the magnetic flux density of the plunger 93d is always relatively high regardless of the plunger travel, but it increases further as the plunger travel increases. Also, the magnetic flux density of the protrusion 93j is always very high regardless of the plunger travel. For this reason, magnetic flux saturation is likely to occur in the plunger 93d and the protrusion 93j. In this embodiment, the degree of magnetic flux saturation is suppressed by providing inclined surfaces on the plunger 93d and the protrusion 93j of the yoke 93b, where magnetic flux saturation is likely to occur.

[0088] According to the driving machine (working machine) 10 and solenoid 93 of this embodiment, by providing a fixed-side first inclined surface 93k and a fixed-side second inclined surface 93m on the protruding portion 93j of the yoke 93b of the solenoid 93, the width of the protruding portion 93j is increased, thereby reducing the magnetic flux density and suppressing magnetic flux saturation. This increases the effect of improving the attractive force by the protruding portion 93j of the yoke 93b.

[0089] Specifically, by expanding the area through which the magnetic flux passes in the protruding portion 93j using two inclined surfaces, the magnetic flux can pass through a wider area, thereby reducing the magnetic flux density. As a result, magnetic flux saturation can be suppressed, and the attractive force at the protruding portion 93j of the yoke 93b can be improved.

[0090] Furthermore, since the effect of improving suction force can be increased, the solenoid 93 can be made smaller and lighter, improving the convenience of the driving machine 10. In addition, the convenience of the solenoid 93 can also be improved by making the solenoid itself smaller. For example, if the inclined surface 101c is made to bulge upward as in the protrusion 101a of Comparative Example 2 in Figure 17, the suction force at the initial stage of movement of the plunger 93d (2 mm) can be increased. Also, if the inclined surface 101d is made to bulge inward as in the protrusion 101a of Comparative Example 3 in Figure 19, the suction force at the later stage of movement of the plunger 93d (7.4 mm) can be increased.

[0091] Furthermore, by providing a protrusion 93j on the contact portion 93g of the yoke 93b so that it approaches the plunger side before the plunger contacts it (0-7.4mm), the suction force before the plunger 93d contacts the contact portion 93g, i.e., the suction force before the plunger contacts it, can be improved.

[0092] Furthermore, by providing the first movable inclined surface 93s and the second movable inclined surface 93t on the plunger 93d, the width of the plunger 93d can be increased, reducing the magnetic flux density and thus suppressing magnetic flux saturation. This improves the attractive force regardless of the position of the plunger 93d.

[0093] Specifically, by including at least two inclined surfaces on the outer circumference of the end of the plunger 93d, the region through which the magnetic flux passes can be expanded. That is, the magnetic flux can pass through a wider area, thereby reducing the magnetic flux density. As a result, magnetic flux saturation can be suppressed, and the attractive force in the plunger 93d can be improved.

[0094] Furthermore, by providing a rounded portion (arc portion) 93vb at the point where the movable first inclined surface 93s and the third inclined surface 99a of the plunger 93d are connected, and a rounded portion (arc portion) 93va at the point where the third inclined surface 99a and the end face 93p are connected, it is possible to suppress the bulging portion (bulge) of the plunger 93d from abutting against the contact portion 93g of the yoke 93b when the plunger 93d abuts against the contact portion 93g. In other words, when the multiple movable contact surfaces 93u of the plunger 93d abut against the contact portion 93g, the rounded portion (arc portion) 93v does not abut against the contact portion 93g. This suppresses wear of the plunger 93d.

[0095] Furthermore, the deepest surface 93i of the contact portion 93g of the yoke 93b is located on one side (rear) of the axial direction B1 than the coil 93n. That is, the portion of the contact portion 93g of the yoke 93b that includes the deepest surface 93i (center 93w) protrudes on one side (rear) of the axial direction B1 than the coil 93n. As a result, as shown in Figure 25, the magnetic flux flowing in the axial direction B1 in the plunger 93d can be increased, and the amount of magnetic flux flow E2 and E3 from the plunger 93d toward the protrusion 93j can be increased, thereby increasing the attractive force.

[0096] Furthermore, the portion of the yoke 93b that protrudes from the coil 93n (the central part 93w including the deepest surface 93i) can be removed by lengthening the coil 93n. However, in this application, priority is given to miniaturizing the coil 93n to reduce the overall size of the solenoid.

[0097] The present invention is not limited to the above embodiments and can be modified in various ways without departing from its spirit. For example, an elastic member may be provided on a part of the deepest surface 93i of the protruding portion 93j of the yoke 93b in the above embodiment. In this case, when the plunger 93d is drawn into the solenoid 93, the tip of the plunger 93d can be brought into contact with the elastic member, thereby mitigating vibration and shock during plunger suction. [Explanation of Symbols]

[0098] 10...Drilling machine (working machine), 11...Housing, 12...Impact section, 13...Injection section, 14...Power supply section, 15...Electric motor, 16...Reduction mechanism, 17...Winding mechanism, 18...Pressure accumulator, 19...Cylinder case, 20...Handle, 21...Motor case, 21a...Extended section, 22...Mounting section, 23...Cap, 25...Head cover, 26...Pressure chamber, 27...Cylinder, 28...Piston, 29...Driver blade, 31...Bumper support section, 32...Nose section, 33...Pinwheel housing section, 35...Bumper, 36...Guide hole, 37...Injection path, 38...Wiring, 50...Pinwheel, 52...Adjuster, 53...Trigger, 76...Storage case, 78...Nail (fastener), 79...Push lever, 82...Controller, 85...Trigger sensor, 90...Magazine section, 90a...Canister, 90b...Passage section, 90j...Lid section, 90k...Shaft section, 90m...Roll nail storage section, 90n...Magazine cover, 91...Feeding section, 92...Tail cover, 93...Solenoid, 93a...Solenoid cover, 93b...Yoke, 93ba...Lid section, 93bb...Outer wall, 93bc...Inner wall, 93c...Holder, 93d...Plunger, 93 e...spring, 93f...terminal, 93g...contact part, 93h...fixed side bulge, 93i...deepest surface, 93j...protrusion, 93k...fixed side first inclined surface, 93m...fixed side second inclined surface, 93n...coil, 93p...end face, 93q...movable side adjacent surface, 93r...movable side bulge, 93s...movable side first inclined surface, 93t...movable side second inclined surface, 93u...movable side contact surface, 93v,93va,93vb,93vc...arc part (circular arc part), 93w...center, 93x...adjacent part, 93y...outer edge, 93z...end, 95...connector, 96...feeder, 96a...feed 97... Stator, 98... Recess, 98a... Inclined surface, 98b... Surface, 99a, 99b... Third inclined surface, 100... Plunger, 100a... End face, 100b... Inclined surface, 100c... First surface, 100d... Second surface, 101... Yoke, 101a... Projection, 101b... First surface, 101c, 101d... Inclined surface, 101e... Second surface, 102... Solenoid, A1... Central axis, B1... Axial direction, C1... Radial direction, D1... Part, E1, E2, E3, E4, E5... Magnetic flux flow, M1... Up / down direction, N1... Front / back direction, R1... Left / right direction, T1, T2, T3... Thickness

Claims

1. The injection unit to which the fastener is supplied, A striking section for striking the fastener supplied to the injection section, A magazine section that houses multiple fasteners wound in a roll, A supply unit that supplies the stopper from the magazine unit to the injection unit, The supply unit has a solenoid that drives the supply unit to supply the fastener, The solenoid comprises a cylindrical stator and a plunger positioned to move axially to one side along the central axis of the stator when the stator is energized. The stator comprises a cylindrical coil and a yoke that supports the coil and has a contact portion against which the plunger abuts when the stator is energized. The contact portion has a deepest surface that contacts one end of the plunger in the axial direction, and a protruding portion that protrudes from the deepest surface on the other side in the axial direction. The aforementioned protrusion is A fixed-side first inclined surface that is inclined with respect to the central axis, A work machine having a fixed-side second inclined surface that is inclined with respect to the central axis such that the angle it makes with the central axis is greater than the angle it makes with the fixed-side first inclined surface and the central axis, and that connects to the fixed-side first inclined surface from the opposite side of the deepest surface, thereby working in cooperation with the fixed-side first inclined surface to define the fixed-side bulge.

2. The plunger is The end face located at one end in the axial direction, The work machine according to claim 1, having a movable adjacent surface whose angle with the central axis is smaller than the angle between the end surface and the central axis, located inward from the first fixed-side inclined surface in the radial direction of the stator, and which connects to the end surface and cooperates with the end surface to define the movable-side bulge.

3. The working machine according to claim 2, wherein the adjacent movable surface is inclined with respect to the central axis.

4. The work machine according to claim 3, wherein the plunger is parallel to the fixed-side first inclined surface, inclined with respect to the central axis such that the angle it makes with the central axis is smaller than the angle it makes with the movable-side adjacent surface and the central axis, and has a movable-side first inclined surface that contacts the fixed-side first inclined surface when the stator is energized.

5. The work machine according to claim 4, wherein the plunger is parallel to the fixed-side second inclined surface, inclined with respect to the central axis such that the angle it makes with the central axis is greater than the angle made between the movable-side first inclined surface and the central axis, and has a movable-side second inclined surface that contacts the fixed-side second inclined surface when the stator is energized.

6. The plunger has multiple movable contact surfaces that make contact with the contact portion when the stator is energized, and each has a different angle with respect to the central axis. It has an arc portion connecting adjacent movable side contact surfaces among the plurality of movable side contact surfaces, The work machine according to claim 1, wherein when the plurality of movable contact surfaces contact the contact portion, the arc portion does not contact the contact portion.

7. The work machine according to claim 1, wherein the deepest surface is located on one side in the axial direction relative to the coil.

8. The work machine according to claim 1, wherein at least a portion of the protrusion is located on the other side in the axial direction from the coil.

9. The aforementioned yoke is The central part where the deepest surface is provided, In the radial direction of the stator, an adjacent portion is provided on the outside of the central portion and adjacent to the central portion, The stator has an outer edge portion that is positioned adjacent to the adjacent portion on the outside of the adjacent portion in the radial direction, and at least a portion of which overlaps with the coil in the axial direction, The work machine according to claim 1, wherein the thickness of the adjacent portion in the axial direction is greater than the thickness of the outer edge portion.

10. The work machine according to claim 9, wherein the thickness of the central part in the axial direction is smaller than the thickness of the outer edge.

11. It comprises a cylindrical stator and a plunger positioned to move axially to one side along the central axis of the stator when the stator is energized. The stator comprises a cylindrical coil and a yoke that supports the coil and has a contact portion against which the plunger abuts when the stator is energized. The contact portion has a deepest surface that contacts one end of the plunger in the axial direction, and a protruding portion that protrudes from the deepest surface on the other side in the axial direction. The aforementioned protrusion is A fixed-side first inclined surface that is inclined with respect to the central axis, A solenoid having a fixed-side second inclined surface that is inclined with respect to the central axis such that the angle it makes with the central axis is greater than the angle it makes with the fixed-side first inclined surface and the central axis, and that connects to the fixed-side first inclined surface from the opposite side of the deepest surface, thereby working in cooperation with the fixed-side first inclined surface to define a fixed-side bulge.

12. The injection unit to which the fastener is supplied, A striking section for striking the fastener supplied to the injection section, A magazine section that houses multiple fasteners wound in a roll, A supply unit that supplies the stopper from the magazine unit to the injection unit, The supply unit has a solenoid that drives the supply unit to supply the fastener, The solenoid comprises a cylindrical stator and a plunger positioned to move axially to one side along the central axis of the stator when the stator is energized. The plunger has a recess on the outer circumference of one end in the axial direction, which is defined by a plurality of surfaces including an inclined surface that is inclined with respect to the axial direction.

Images