Work machine

Abstract

To provide a work machine configured so that biting of a jig can be easily released to improve convenience.SOLUTION: A striking part 70 has: a plunger 71 that receives energizing force from a driving spring 33; and a driver blade 72 coming into contact with a staple at the time of striking. The plunger 71 has: a first engagement state where the plunger engages with the driver blade 72; and a second engagement state where the plunger engages with the driver blade 72 so that the plunger can move relatively with respect to the driver blade 72 by a certain distance (about 15.0 mm) larger than that in the first engagement state. When a broken staple piece is bitten in, the plunger 71 is disengaged from the driver blade 72 so that a state is brought into the second engagement state, and only the plunger 71 is moved, so that the plunger 71 strikes the driver blade 72. An own operation of an electric tacker 10 enables release of biting-in of the staple piece, so as to improve convenience.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a work machine that strikes a fastener with a striking part and ejects the fastener toward a target material. [Background technology]

[0002] An example of a work machine that shoots a fastener toward a mating material is described in Patent Document 1. The fastener driver described in Patent Document 1 includes a striking unit having a plunger that is moved by the biasing force of a spring and a driver blade that strikes the fastener, an electric motor that moves the striking unit against the biasing force of the spring, a housing that contains the striking unit and the electric motor, and a magazine that is supported by the housing and is loaded with a plurality of fasteners. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-019075 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when the material into which the fastener is driven is wood or the like, the fastener is not subjected to a large load and can be driven into the material properly. However, if the fastener is mistakenly injected into a material with high hardness such as a steel plate, the fastener will break. Then, when the driver blade is retracted, the broken fastener may get caught in the injection part, making it impossible for the driver blade to operate thereafter.

[0005] In this case, with the technology described in Patent Document 1, it was necessary to disassemble the housing, remove the impact part housed in the housing, and hit the driver blade forming the impact part with a hammer or the like in the ejection direction of the fastener to release the engagement of the broken fastener. It was difficult for a worker to carry out such work, and it was necessary to request repairs from, for example, a dealer, which ultimately resulted in a loss of work time.

[0006] An object of the present invention is to provide a work machine capable of easily releasing the engagement of a fastener and improving convenience. [Means for solving the problem]

[0007] In one embodiment of the present invention, a fastener is provided with a striking portion that strikes a fastener, a biasing portion that biases the striking portion to one side in a first direction, and a drive portion that moves the striking portion to the other side in the first direction against the biasing force of the biasing portion, wherein the striking portion has a base that receives the biasing force of the biasing portion and an abutment portion that abuts against the fastener upon striking, and the base has a first engagement state in which it engages with the abutment portion and a second engagement state in which it engages with the abutment portion so as to be movable relative to the abutment portion a fixed distance greater than the first engagement state. Effect of the Invention

[0008] According to the present invention, it is possible to realize a work machine that can easily release the engagement of a fastener and improve user-friendliness. [Brief description of the drawings]

[0009] [Figure 1] This is a view of the electric tacker from the right side. [Diagram 2] FIG. 2 is a view taken along the arrow A in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is an enlarged view of a portion C circled by a dashed line in FIG. [Figure 6]FIG. 2 is a perspective view of the element unit alone, as viewed from the right front side. [Figure 7] FIG. 2 is a perspective view of the element unit alone, as viewed from the left rear side. [Figure 8] FIG. 4 is a perspective view showing the left housing half and the element unit. [Figure 9] FIG. 4 is a perspective view showing a right housing half and an element unit. [Figure 10] This is an oblique view of the striking part alone, seen from the right side and rear. [Figure 11] This is an oblique view of the striking part alone, seen from the right side and front. [Figure 12] 13 is a top view illustrating the normal operation of the striking section. FIG. [Figure 13] 13A and 13B are views illustrating the engagement release operation of the impact portion as viewed from above. [Figure 14] FIG. 13 is a perspective view illustrating how to remove the cover member. [Figure 15] FIG. 13 is a perspective view illustrating how to remove the fixing pin. [Figure 16] 13 is a top view illustrating the operation of the impact part after it is released from its bite. FIG. [Figure 17] FIG. 13 is a perspective view illustrating a procedure 1 for changing to an electric tacker with different specifications. [Figure 18] This is an oblique view illustrating a second procedure for changing to an electric stapler with different specifications. [Figure 19] FIG. 11 is a perspective view illustrating a third procedure for changing to an electric stapler of a different specification. [Figure 20] FIG. 11 is a perspective view illustrating a fourth procedure for changing to an electric stapler of a different specification. [Figure 21] This is an oblique view explaining step 5 of changing to an electric stapler of different specifications. [Figure 22] FIG. 6 is a perspective view illustrating a procedure 6 for changing to an electric stapler of a different specification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0011] FIG. 1 shows the electric tacker as seen from the right side, FIG. 2 shows a view taken along the arrow A in FIG. 1, FIG. 3 shows a cross-sectional view taken along line BB in FIG. 2, and FIG. 4 shows an oblique view explaining the impact mechanism.

[0012] <Electric tacker> 1 to 4, the electric tacker 10 is an electric tool that ejects a staple 11 formed in a substantially U-shape toward a mating material M. Specifically, the electric tacker 10 is used when fixing a vinyl sheet, cloth, or even a thin plywood board (not shown) to the mating material M. However, the mating material M is not a high-hardness material such as a steel plate, but a relatively soft material such as wood.

[0013] The electric stapler 10 corresponds to the working machine in the present invention, and the staple 11 corresponds to the fastener in the present invention.

[0014] <Housing> The electric tacker 10 includes a housing 20 formed into a substantially annular shape by injection molding a resin material such as plastic. The housing 20 is formed by butting together a left housing half 21 and a right housing half 22 that are divided in two in the left-right direction. Note that in Figs. 3 and 4, only the left housing half 21 is shown in order to make it easier to see the internal structure of the housing 20.

[0015] Here, the left housing half 21 corresponds to the first housing half in the present invention, and the right housing half 22 corresponds to the second housing half in the present invention. The left housing half 21 and the right housing half 22 are divided in a direction intersecting both the front-rear direction and the up-down direction (the axial direction of the rotation shaft 63a of the motor 61).

[0016] 1 and 3, the housing 20 includes a hollow striking mechanism accommodating section 23, a hollow driving mechanism accommodating section 24, a hollow board accommodating section 25, and a hollow handle section 26. In this manner, the housing 20, which is substantially annular, has a total of four hollow sections.

[0017] The impact mechanism accommodating portion 23 extends in the front-rear direction facing the mating material M, and the drive mechanism accommodating portion 24 extends in the up-down direction perpendicular to the front-rear direction. The board accommodating portion 25 extends in the same front-rear direction as the impact mechanism accommodating portion 23, and the handle portion 26 extends in the same up-down direction as the drive mechanism accommodating portion 24.

[0018] The striking mechanism accommodating section 23, the driving mechanism accommodating section 24, the board accommodating section 25 and the handle section 26 are connected to each other at their respective ends. Thus, in the center of the housing 20, as shown in Figs. 1 and 3, an opening 27 is formed that penetrates in the left-right direction and in which the fingers of an operator (not shown) are placed.

[0019] 1 and 3, the direction in which the board accommodating section 25, the drive mechanism accommodating section 24 (handle section 26), and the striking mechanism accommodating section 23 are aligned is defined as the "up-down direction." The extension direction of the striking mechanism accommodating section 23, i.e., the ejection direction of the staples 11, is defined as the "front-rear direction." Furthermore, the butt direction of the left housing half 21 and the right housing half 22, i.e., the opposing direction of the left and right housing halves 21, 22, is defined as the "left-right direction."

[0020] <Impact mechanism> 3 and 4, the striking mechanism 30 is accommodated inside the striking mechanism accommodating section 23. The striking mechanism 30 is driven by a motor 61 accommodated inside the drive mechanism accommodating section 24, and has a function of ejecting staples 11 (see FIG. 1) toward a target material M (see FIG. 1).

[0021] The striking mechanism 30 is provided with a support shaft 31 made of a round steel bar. The support shaft 31 is disposed substantially in the center of the striking mechanism housing portion 23, and both axial ends of the support shaft 31 are fixed to the striking mechanism housing portion 23. The support shaft 31 extends in the front-rear direction, and guides the movement of a striking portion 70 (see FIGS. 10 and 11) that strikes the staples 11.

[0022] The striking mechanism 30 also includes a support rail 32 fixed to the striking mechanism housing portion 23. The support rail 32 is formed into a generally rod-like shape by pressing a steel plate or the like, and is parallel to the support shaft 31. Similarly to the support shaft 31, the support rail 32 also guides the movement of the striking portion 70.

[0023] An annular spring seat 31a is provided integrally with the axial rear side of the support shaft 31. A drive spring 33 having a relatively large spring constant is provided between the spring seat 31a and the striking portion 70. The drive spring 33 biases the striking portion 70 to one side in the axial direction of the support shaft 31 (to the front side in the front-rear direction).

[0024] The drive spring 33 corresponds to the biasing portion in the present invention, and one axial side (front side in the front-rear direction) of the support shaft 31 corresponds to one side in a first direction in the present invention.

[0025] That is, the drive spring 33 accumulates elastic energy for vigorously ejecting the staples 11. Specifically, when the striking portion 70 is moved to the other axial side (rear side) of the support shaft 31 by the drive of the drive gear 34, the drive spring 33 is compressed and accumulates elastic energy.

[0026] In addition, a damper member 35 is provided on the axial front side of the support shaft 31. The damper member 35 forms part of the striking mechanism 30 and is made of rubber with excellent flexibility. The damper member 35 is disposed on the axis of the support shaft 31 and absorbs the impact of the striking part 70 that is moved forcefully to the axial front side of the support shaft 31. This improves the quietness of the electric tacker 10 and suppresses the transmission of impact to the operator.

[0027] The striking mechanism 30 includes a driving gear 34 that drives the striking portion 70. The driving gear 34 is driven by a motor 61, and moves the striking portion 70 rearward against the spring force of the driving spring 33, as shown by an arrow M1 in Fig. 4. The driving gear 34 and the pinion PN that meshes with the driving gear 34 are supported by a high-strength gear holder 36 made of a steel plate.

[0028] Here, the motor 61 corresponds to the drive section in the present invention, and the rear side (rear side in the front-rear direction) to which the striking section 70 is moved by the drive of the motor 61 corresponds to the other side in the first direction in the present invention.

[0029] Further, small cam roller 34a and large cam roller 34b, which protrudes more than small cam roller 34a, are provided integrally on the axially upper side of drive gear 34. Both small cam roller 34a and large cam roller 34b protrude toward striking portion 70 and move in a circular motion around the axis of drive gear 34 in response to rotation of drive gear 34. As a result, striking portion 70, which is engageable with small cam roller 34a and large cam roller 34b, respectively, is moved axially rearward of support shaft 31.

[0030] <Push lever> FIG. 5 shows an enlarged view of the portion C circled by the dashed line in FIG.

[0031] 3 and 5, the impact mechanism 30 includes a push lever 40 that is pressed by a mating material M (see FIG. 1) when the electric tacker 10 is in use. The push lever 40 is formed into a generally rod-like shape by pressing a steel plate or the like, and includes a lever body 41 that extends in the front-rear direction, and a switch operation part 42 that extends downward from the lever body 41. In other words, the push lever 40 is generally L-shaped when the electric tacker 10 is viewed from the left-right direction.

[0032] Here, the push lever 40 is disposed on the staple 11 side, which is forward of the damper member 35, in the axial direction of the support shaft 31, and is movable in the front-rear direction. The switch operating section 42 turns on and off a microswitch 52 (see Figs. 3 and 5) forming an element unit 50 disposed near the drive gear 34 and the damper member 35, in accordance with the movement of the lever body 41 in the front-rear direction.

[0033] A return spring 43 that presses the push lever 40 forward is provided on the rear side of the push lever 40. The return spring 43 is a coil spring with a relatively small spring constant, and generates a spring force sufficient to move the push lever 40 forward.

[0034] 5, when the electric tacker 10 is not in use, the tip (front side in the figure) of the lever body 41 is protruded a predetermined amount toward the front side of the electric tacker 10 by the spring force of the return spring 43. At this time, the switch operating unit 42 does not turn on the microswitch 52, and the microswitch 52 is in the off state.

[0035] In contrast, when the electric tacker 10 is in use, the tip of the lever body 41 is pressed by the opposing material M (see Fig. 1), and the lever body 41 is moved rearward as shown by the arrow M2 in Fig. 5. Accordingly, the switch operating part 42 is also moved rearward, and as the lever member 52b swings, the microswitch 52 is turned on as shown by the arrow M3 in Fig. 5.

[0036] 3, a trigger switch 55 is provided inside the handle portion 26, near the striking mechanism housing portion 23. The trigger switch 55 is linked to the operation of a trigger 56 operated by the finger of the operator, and when the microswitch 52 is in the on state and the trigger 56 is pulled to turn the trigger switch 55 on, the motor 61 is driven.

[0037] That is, in order to use the electric tacker 10, unless the operator presses the push lever 40 of the electric tacker 10 against the workpiece M, the electric tacker 10 will not operate even if the trigger 56 is pulled. In this way, the push lever 40 and the microswitch 52 operated by the push lever 40 function as a safety device.

[0038] <Element unit> Figure 6 is an oblique view of the element unit alone from the right side and the front, Figure 7 is an oblique view of the element unit alone from the left side and the rear, Figure 8 is an oblique view showing the left housing half and element unit, and Figure 9 is an oblique view showing the right housing half and element unit.

[0039] 5 to 7, the element unit 50 is a unit formed of a plurality of electric elements. Specifically, the element unit 50 includes an element case 51 formed in a substantially box shape from a resin material such as plastic.

[0040] The element case 51 has a bottom wall 51a, and a front wall 51b, an upper wall 51c, and a rear wall 51d are integrally provided on the outer edge of the bottom wall 51a. The front wall 51b, the upper wall 51c, and the rear wall 51d are provided to stand at right angles to the bottom wall 51a.

[0041] A microswitch 52 that is turned on and off by a push lever 40 is housed inside the area surrounded by the front wall 51b, the upper wall 51c, and the rear wall 51d. That is, the element case 51 holds the microswitch 52. The microswitch 52 has an operation button 52a, and the operation button 52a can be pressed by a lever member 52b that is provided on the microswitch 52 so as to be able to swing.

[0042] Here, the rear side of the lever member 52b is exposed to the outside of the element case 51 through a notch 51e provided in the upper wall portion 51c. As the lever body 41 moves rearward, the switch operation portion 42 of the push lever 40 presses the rear side of the lever member 52b, causing the lever member 52b to swing.

[0043] Further, a Hall element fixing portion 51f is integrally provided on the front wall portion 51b. The Hall element fixing portion 51f is a recessed groove, and a sensor board 53a on which a Hall element 53 is mounted is fixed to the Hall element fixing portion 51f. That is, the element case 51 holds the Hall element 53. The detection surface of the Hall element 53 faces the front side, that is, the pressing mechanism side of the staple storage portion 67, and can face the magnet MG provided on the tip side (upper side) of the pressing mechanism.

[0044] When a sufficient amount of staples 11 is stored (loaded) inside the staple storage portion 67, the hall element 53 and the magnet MG do not face each other in the front-rear direction, and when the remaining amount of staples 11 inside the staple storage portion 67 becomes small, the hall element 53 and the magnet MG face each other in the front-rear direction. In other words, the hall element 53 is used to detect the remaining amount of staples 11, and when the remaining amount of staples 11 becomes small, the control board 64 (see FIG. 3) stops the motor 61.

[0045] This prevents the electric tacker 10 from hitting empty sheets. This prevents the electric tacker 10 itself from being damaged by the large impact of the striking unit 70 during empty hitting, and prevents the large impact of the striking unit 70 during empty hitting from being transmitted to the operator. In this way, the Hall element 53 and the magnet MG function as an empty hitting prevention device.

[0046] The microswitch 52 and the Hall element 53 detect the state of the electric tacker 10 and correspond to the multiple elements in the present invention.

[0047] Furthermore, an LED light 54 is disposed on the opposite side (left side) of the bottom wall portion 51a from the side where the microswitch 52 is provided. The irradiation direction LD of the LED light 54 is the front side of the electric tacker 10, as shown by the arrows in Figures 5 and 6. In other words, the LED light 54 illuminates the destination where the staple 11 is to be ejected.

[0048] The LED light 54 corresponds to the illumination unit in the present invention.

[0049] This allows the worker to clearly see the workpiece M (see FIG. 1) into which the staple 11 is to be driven even in a dark work site. The LED light 54 is turned on, for example, when the trigger switch 55 (see FIG. 1) is turned on.

[0050] 8, the left side of the element unit 50, i.e., the side where the LED light 54 of the element unit 50 is arranged (see FIG. 7), is attached to the left element unit attachment portion 21a provided on the left housing half 21. On the other hand, as shown in FIG. 9, the right side of the element unit 50, i.e., the side where the microswitch 52 of the element unit 50 is arranged (see FIG. 6), is attached to the right element unit attachment portion 22a provided on the right housing half 22.

[0051] When the left and right housing halves 21 and 22 are butted against each other to form the housing 20, the element unit 50 is fixed by being sandwiched between the left and right housing halves 21 and 22.

[0052] Specifically, first, the LED light 54 forming the element unit 50 is attached to the left element unit attachment portion 21a of the left housing half 21. Next, the element case 51, which houses the microswitch 52 and has the sensor board 53a having the Hall element 53 attached thereto, is attached to the left element unit attachment portion 21a so as to overlap the LED light 54.

[0053] Thereafter, the right housing half 22 is butted against the left housing half 21, so that the microswitch 52 side of the element unit 50 is attached to the right element unit attachment portion 22a of the right housing half 22. As a result, the element unit 50 is sandwiched between the left housing half 21 and the right housing half 22 without rattling. In other words, the left housing half 21 and the right housing half 22 sandwich the LED light 54 and the element case 51 that form the element unit 50.

[0054] <Drive mechanism> 3 and 4, a drive mechanism 60 is accommodated inside the drive mechanism accommodating section 24. The drive mechanism 60 includes a motor 61 that drives the impact mechanism 30, and the motor 61 is disposed in the center of the drive mechanism accommodating section 24 in the longitudinal direction.

[0055] The motor 61 has a stator 62 and a rotor 63, and the stator 62 is fixed to the drive mechanism accommodating portion 24. On the other hand, the rotor 63 is provided radially inside the stator 62 so as to be rotatable via a small gap.

[0056] Here, the battery pack BP is detachably attached to the lower side of the board housing portion 25. The battery pack BP includes battery cells that can be charged and discharged, and the battery pack BP is slidable in the front-rear direction relative to the board housing portion 25. This allows the electric tacker 10 to be operated continuously by preparing multiple battery packs BP.

[0057] To remove the battery pack BP from the board housing portion 25, an unlock button BT (see FIG. 1) provided on the battery pack BP is pressed.

[0058] The drive mechanism 60 also includes a planetary gear reducer 65. The planetary gear reducer 65 includes a ring gear RG fixed to the drive mechanism housing portion 24, a sun gear SG that rotates together with the rotating shaft 63a on the radially inner side of the ring gear RG, a plurality of planetary gears PG that are meshed with both the sun gear SG and the ring gear RG and roll around the sun gear SG, and a carrier CR that supports the rotating shafts of these planetary gears PG. A pinion PN that meshes with the drive gear 34 is integrally provided at the rotation center of the carrier CR.

[0059] As a result, the rotation of the rotating shaft 63a, which rotates at high speed, is decelerated and output from the pinion PN to the drive gear 34 with high torque.

[0060] 1 to 3, a pair of support walls 24a, 24b are integrally provided on the front side of the drive mechanism accommodating portion 24. One support wall 24a is integrally provided on the left housing half 21, and the other support wall 24b is integrally provided on the right housing half 22. These support walls 24a, 24b extend along the longitudinal direction (up-down direction) of the drive mechanism accommodating portion 24 and are provided so as to protrude to the front side of the drive mechanism accommodating portion 24.

[0061] A staple storage section 67 in which a plurality of staples 11 are loaded is removably attached to the pair of support walls 24a, 24b. Specifically, the staple storage section 67 is movable in the up-down direction relative to the pair of support walls 24a, 24b. As a result, the staple storage section 67 is covered in the left-right direction by the pair of support walls 24a, 24b. This improves the appearance of the electric tacker 10. However, when the electric tacker 10 is in use, the staple storage section 67 is fixed to the pair of support walls 24a, 24b.

[0062] The pair of support walls 24a, 24b correspond to the covering portion in the present invention.

[0063] Here, the multiple staples 11 loaded inside the staple storage portion 67 are integrated with each other to form a rod shape extending in the vertical direction. Then, by one striking operation of the striking portion 70, one of the multiple staples 11 is separated and ejected from the ejecting portion 80 toward the target material M (see FIG. 1).

[0064] Inside the staple accommodating section 67, a pressing mechanism (not shown) having a spring for pressing the staple 11 toward the ejecting section 80 is movably provided. Then, by loading the staple 11 into the staple accommodating section 67 and pushing the pressing mechanism into the staple accommodating section 67, the staple 11 is pressed toward the ejecting section 80. Here, below the pressing mechanism in the longitudinal direction, a stop lever 67a for locking the pressing mechanism with respect to the staple accommodating section 67 is provided.

[0065] The staple storage section 67 and the pressing mechanism correspond to the magazine in the present invention.

[0066] <Detailed structure of the striking part and its surroundings> Next, the detailed structure of the hitting portion 70 and its surroundings will be described in detail with reference to the drawings.

[0067] Figure 10 is an oblique view of the striking unit alone from the right side and the rear, Figure 11 is an oblique view of the striking unit alone from the right side and the front, Figure 12 is a view from above explaining the normal operation of the striking unit, Figure 13 is a view from above explaining the operation of the striking unit to release the engagement, Figure 14 is an oblique view explaining how to remove the cover member, Figure 15 is an oblique view explaining how to remove the fixing pin, and Figure 16 is a view from above explaining the operation of the striking unit after it has been released from the engagement.

[0068] 10 and 11, the impact section 70 forming the impact mechanism 30 includes a plunger 71, a driver blade 72, and a fixed pin 73. The plunger 71 is formed into a substantially box-like shape by pressing a thick steel plate, and has a certain amount of mass. This enables the staple 11 to be impacted forcefully toward the target material M (see FIG. 1).

[0069] The plunger 71 forming the striking portion 70 corresponds to the base portion in the present invention.

[0070] The plunger 71 has a plunger body 71b with an insertion hole 71a through which the support shaft 31 is inserted. The axial front side of the drive spring 33 (see FIG. 4) abuts against the rear side of the plunger body 71b, and the plunger body 71b receives the spring force (biasing force) of the drive spring 33.

[0071] Further, guide arms 71c are provided on the left and right sides of the plunger body 71b so as to extend rearward from the plunger body 71b. The pair of guide arms 71c are engaged with a support rail 32 (see FIG. 4) fixed to the striking mechanism housing 23, and are slidable in the front-rear direction relative to the support rail 32. Note that in FIG. 4, only the left side of the support rail 32 is shown in order to make it easier to see the positional relationship of the drive spring 33.

[0072] Furthermore, a first engaging protrusion 71d and a second engaging protrusion 71e protruding toward the drive gear 34 (see FIG. 4) are integrally provided on the lower side of the plunger body 71b. The protruding height of the first engaging protrusion 71d is greater than the protruding height of the second engaging protrusion 71e. The first engaging protrusion 71d is disposed rearward of the second engaging protrusion 71e.

[0073] These first and second engagement protrusions 71d, 71e are respectively disposed in the vicinity of the drive gear 34 on the upper side of the drive gear 34. The first engagement protrusion 71d is capable of engaging with the small cam roller 34a (see FIG. 4) of the drive gear 34 as the drive gear 34 rotates. On the other hand, the second engagement protrusion 71e is capable of engaging with the large cam roller 34b (see FIG. 4) of the drive gear 34 as the drive gear 34 rotates.

[0074] A blade fixing portion 71f is integrally provided on the upper side of the plunger body 71b so as to protrude from the rear side of the plunger body 71b. The rear side of the wide body portion 72a of the driver blade 72 is fixed to the blade fixing portion 71f by a fixing pin 73. The blade fixing portion 71f is provided with an insertion hole 71g (see FIG. 5) that penetrates in the vertical direction and into which the pin body 73a of the fixing pin 73 is inserted.

[0075] Engagement protrusions 71h are integrally provided on the rear and left and right sides of the blade fixing portion 71f. These engagement protrusions 71h protrude upward from the blade fixing portion 71f at a predetermined height, and the protruding height exceeds the thickness dimension of the driver blade 72 and is approximately the same height as the height position of the pin head 73b of the fixing pin 73. In the left-right direction of the striking portion 70, a narrow portion 72b provided rearward of the wide main body portion 72a of the driver blade 72 is disposed between the pair of engagement protrusions 71h.

[0076] Further, the pair of engaging protrusions 71h are each provided with a front side surface SF1 facing the front side and a rear side surface SF2 facing the rear side in the front-rear direction of the striking part 70. Note that the plunger 71 and the driver blade 72 can be moved individually in the front-rear direction by removing the fixing pin 73.

[0077] Here, as shown in FIG. 4, the striking portion 70 consisting of the plunger 71, the driver blade 72 and the fixing pin 73 can be exposed to the outside without disassembling the housing 20 (see FIG. 1), that is, without separating the left housing half 21 and the right housing half 22 (see FIG. 2).

[0078] Specifically, the upper side of the striking mechanism accommodating portion 23 is closed by a cover member RD (see FIG. 1). The cover member RD is fixed to the striking mechanism accommodating portion 23 forming the housing 20 by a pair of first fixing screws S1 (see FIG. 14) arranged on the left and right sides. That is, by removing the pair of first fixing screws S1, the cover member RD can be removed from the striking mechanism accommodating portion 23. This makes it possible to access the fixing pin 73 and remove the fixing pin 73 without disassembling the housing 20 (see FIG. 1).

[0079] Then, when the fixing pin 73 is removed to allow the plunger 71 and the driver blade 72 to move relatively, the front side surfaces SF1 of the pair of engaging protrusions 71h can come into contact with a pair of first shoulder portions 72c (only one of which is shown in FIG. 11) provided on the driver blade 72. On the other hand, the rear side surfaces SF2 of the pair of engaging protrusions 71h can come into contact with a pair of second shoulder portions 72e provided on the driver blade 72.

[0080] The front side surface SF1 of the engaging protrusion 71h faces the front side in the front-rear direction and is capable of coming into contact with the first shoulder portion 72c, and corresponds to the contact surface in the present invention.

[0081] The driver blade 72 is made of a high hardness steel plate and comes into contact with the staple 11 to strike the staple 11 when the striking portion 70 strikes the staple 11. The driver blade 72 has a thickness equal to or less than the thickness of the staple 11 to avoid striking two staples 11, and is thinner than the thickness of the plunger 71.

[0082] The driver blade 72 corresponds to the contact portion in the present invention.

[0083] Here, the driver blade 72 has a wide main body portion 72a disposed on the front side and a narrow portion 72b disposed on the rear side, and the length dimension in the front-rear direction of the wide main body portion 72a is approximately four times the length dimension in the front-rear direction of the narrow portion 72b. On the other hand, the width dimension in the left-right direction of the wide main body portion 72a is approximately twice the width dimension in the left-right direction of the narrow portion 72b.

[0084] The driver blade 72 also has a retaining portion 72d on the side opposite the wide main body portion 72a of the narrow portion 72b, and the length of the retaining portion 72d in the front-to-rear direction is approximately one-fifth the length of the narrow portion 72b in the front-to-rear direction. On the other hand, the width of the retaining portion 72d in the left-to-right direction is approximately the same as the width of the wide main body portion 72a in the left-to-right direction.

[0085] A pair of first shoulders 72c facing the longitudinal rear side of the driver blade 72 are provided at the boundary between the wide body portion 72a and the narrow portion 72b of the driver blade 72. A pair of second shoulders 72e facing the longitudinal front side of the driver blade 72 are provided at the boundary between the narrow portion 72b of the driver blade 72 and the retaining portion 72d of the driver blade 72.

[0086] The wide main body portion 72a of the driver blade 72 is slidably held by a metallic ejection portion 80. The ejection portion 80 also closes the upper side of the striking mechanism accommodating portion 23, similar to the cover member RD. The ejection portion 80 is fixed to the striking mechanism accommodating portion 23 of the housing 20 by a pair of second fixing screws S2 (see FIG. 19) arranged on the left and right sides, and a set of bolt nuts S3 (see FIG. 19) extending in the left-right direction.

[0087] The striking mechanism accommodating portion 23 of the housing 20 corresponds to the mounting portion to which the ejection portion 80 of the present invention is mounted.

[0088] In other words, by removing a pair of second fixing screws S2 and a set of bolts and nuts S3, the ejection portion 80 and the driver blade 72 held therein can be separated from the impact mechanism accommodating portion 23 without disassembling the housing 20 (see FIG. 1).

[0089] The staples 11 stored in the staple storage portion 67 are supplied to the ejection portion 80 (see FIG. 5). As a result, the staples 11 are struck one by one by the driver blade 72 (wide main body portion 72a) slidably held in the ejection portion 80, and the staples 11 are ejected one by one from the tip portion (front side) of the ejection portion 80 toward the target material M (see FIG. 1).

[0090] <Operation explanation of electric tacker> Next, the operation of the electric tacker 10 configured as described above will be described in detail with reference to the drawings. Note that Figures 12, 13, and 16 show the state in which the cover member RD is removed in order to make it easier to understand the operation of the striking unit 70 inside the striking mechanism housing unit 23.

[0091] <Normal operation> 12, when the electric tacker 10 is operating normally, the plunger 71 of the striking portion 70 is engaged with the driver blade 72 via the fixed pin 73 so as to move integrally with the driver blade 72. This engaged state of the plunger 71 and the driver blade 72 during normal operation (an engaged state that includes some rattling) corresponds to the first engaged state in the present invention.

[0092] Furthermore, the fixing pin 73 that engages the plunger 71 and the driver blade 72 so that they can move together corresponds to a first engaging portion in the present invention. In this manner, in an engaged state in which the plunger 71 and the driver blade 72 move together, the plunger 71 and the driver blade 72 are engaged with each other by the fixing pin 73.

[0093] The striking portion 70 in the first engagement state can be moved between the bottom dead center, the standby position, and the top dead center by the driving force of the motor 61 (see FIG. 3) and the spring force (biasing force) of the driving spring 33.

[0094] 12, when the striking portion 70 is at the bottom dead center, the engaging protrusion 71h is located at position BD, based on the position of the engaging protrusion 71h in the front-to-rear direction of the plunger 71. When the striking portion 70 is at the top dead center, the engaging protrusion 71h is located at position TD, which is approximately 28.0 mm rearward of position BD. In other words, the movable range of the plunger 71 (the distance between the top dead center and the bottom dead center) is approximately 28.0 mm.

[0095] Furthermore, when striking unit 70 is in the [standby position], engaging protrusion 71h is located at position N closer to position TD than the intermediate position between positions BD and TD. Here, the [standby position] is the position where striking unit 70 waits when electric tacker 10 is stopped, and by operating electric tacker 10 from this [standby position], striking unit 70 quickly moves from position N to position TD, and then quickly reaches position BD to strike staples 11. In other words, by positioning striking unit 70 in the [standby position] when electric tacker 10 is stopped, staples 11 can be quickly ejected from ejection unit 80, thereby improving operability.

[0096] <How to deal with staple jams> For example, if the electric tacker 10 is mistakenly operated on a hard material such as a steel plate, the staple 11 (see FIG. 1) breaks and remains inside the ejection unit 80. The driving force of the motor 61 (see FIG. 3) then causes the striking unit 70 to return to the "standby position" shown in FIG. 12. At this time, as shown by the dashed circle in "staple jam" in FIG. 13, the striking unit 70 is pulled backward and the broken staple piece SP becomes caught between the driver blade 72 and the ejection unit 80.

[0097] At this time, the striking section 70 attempts to move from position BD, which is the bottom dead center, to position TD, which is the top dead center, by the driving force of the motor 61, but at position Lock, which is midway (almost in the middle), the staple piece SP becomes more firmly bitten, and the motor 61 stops. This causes the electric tacker 10 to become inoperable.

[0098] Therefore, the operator can easily release the biting of the staple piece SP by following the procedure described below. Specifically, the plunger 71 is set in a state in which it can move relatively to the driver blade 72 that has been locked by the biting of the staple piece SP, and in this state, the plunger 71 is moved rearward by itself, and then moved forward, whereby the plunger 71 strikes the driver blade 72 toward the front. This releases the biting of the staple piece SP.

[0099] First, as shown in Fig. 14, a pair of first fixing screws S1 are removed using a tool such as a screwdriver (not shown). Next, as shown by arrow M4, the cover member RD is removed from the striking mechanism accommodating portion 23 of the housing 20. This causes the striking portion 70 accommodated inside the striking mechanism accommodating portion 23 to be exposed to the outside.

[0100] Thereafter, as shown by arrow M5 in Fig. 15, the fixing pin 73 is removed. At this time, a tool such as a screwdriver with a flat-head tip (not shown) is used to remove the fixing pin 73. Note that the fixing pin 73 can be easily removed since it is only inserted into both the through-hole 72f of the driver blade 72 (see Fig. 5) and the insertion hole 71g of the plunger 71 (see Fig. 5).

[0101] As a result, the plunger 71 and the driver blade 72 are separated from each other and are capable of relative movement. Specifically, as shown in [Plunger only at top dead center] and [Strike by plunger] in Fig. 13, the engaging protrusion 71h of the plunger 71 is capable of moving a certain distance in the front-rear direction in the portion corresponding to the narrow width portion 72b of the driver blade 72. In other words, the engaging protrusion 71h is capable of moving a distance of about 15.0 mm between the first shoulder portion 72c and the second shoulder portion 72e.

[0102] In this manner, by removing the fixing pin 73, the plunger 71 of the striking portion 70 becomes movable by a certain distance (approximately 15.0 mm) relative to the driver blade 72. Therefore, the engaging protrusion 71h of the plunger 71 becomes engageable with both the first shoulder portion 72c and the second shoulder portion 72e of the driver blade 72.

[0103] In this way, the engagement state in which the plunger 71 and the driver blade 72 are capable of relative movement a certain distance (approximately 15.0 mm) that is greater than the state in which they are engaged so as to move together via the fixed pin 73 (the first engagement state including some wobble), and in which the engagement protrusion 71h is capable of engaging with both the first shoulder portion 72c and the second shoulder portion 72e corresponds to the second engagement state in the present invention.

[0104] Moreover, the engagement protrusion 71h and the first and second shoulder portions 72c, 72e that engage the plunger 71 and the driver blade 72 to be relatively movable by a fixed distance (about 15.0 mm) correspond to the second engagement portion in the present invention. In this manner, in an engagement state in which the plunger 71 and the driver blade 72 move relatively by a fixed distance (about 15.0 mm), the plunger 71 and the driver blade 72 are not engaged by the fixing pin 73, but are engaged by the engagement protrusion 71h and the first and second shoulder portions 72c, 72e.

[0105] After the plunger 71 and the driver blade 72 are made relatively movable, the cover member RD is attached to the striking mechanism housing 23 and fixed with a pair of first fixing screws S1. Next, the electric tacker 10 is butted against wood or the like (not shown) to operate the push lever 40, and the trigger 56 (see FIG. 3) is pulled to drive the motor 61. In other words, the electric tacker 10 is operated as in the normal state.

[0106] Then, as shown by the arrow M6 in Fig. 13, only the plunger 71 moves rearward by itself, and the engaging protrusion 71h of the plunger 71 moves away from the first shoulder 72c (position EF) of the driver blade 72 and approaches position TD, which is the "top dead center". At this time, the driver blade 72 is stopped at position Lock, which is approximately halfway between positions BD and TD, so that the position ER of the second shoulder 72e of the driver blade 72 is located rearward of position TD, which is the "top dead center". Therefore, the rear side surface SF2 (see Fig. 10) of the engaging protrusion 71h does not come into contact with the second shoulder 72e and does not interfere with the driving of the motor 61.

[0107] 13, the spring force (biasing force) of the drive spring 33 causes the plunger 71 to move forward with force, striking the driver blade 72 forward. At this time, since the first shoulder 72c of the driver blade 72 is at position EF rearward of position BD, which is the bottom dead center, the front side surface SF1 (see FIG. 11) of the engagement protrusion 71h collides with the first shoulder 72c with force. Therefore, the spring force F (see the white arrow in the figure) of the drive spring 33 is reliably transmitted to the driver blade 72.

[0108] In this way, the engagement protrusion 71h and the first shoulder portion 72c are configured to apply the moving force of the plunger 71 (the spring force of the drive spring 33) to the driver blade 72 when the plunger 71 moves forward in the front-to-rear direction relative to the driver blade 72.

[0109] In other words, when the plunger 71 moves forward relative to the driver blade 72 in the fore-and-aft direction in an engaged state in which the engagement protrusion 71h is able to engage with both the first shoulder portion 72c and the second shoulder portion 72e, the plunger 71 applies a moving force to the driver blade 72.

[0110] Next, as shown by the arrow M8 in [staple removal] in Fig. 16, the staple piece SP is removed by the forward movement of the driver blade 72. At this time, the plunger 71 stops at the position BD which is the [bottom dead center], and the driver blade 72 moves forward with force, but the second shoulder portion 72e of the driver blade 72 abuts (gets caught) on the rear side surface SF2 (see Fig. 10) of the engaging protrusion 71h. Therefore, the position ER of the second shoulder portion 72e reaches the position BD which is the [bottom dead center], and as shown by the dashed arrow x, the driver blade 72 is prevented from moving forward any further.

[0111] In this way, the engagement protrusion 71h and the second shoulder portion 72e prevent the driver blade 72 from moving forward in the front-to-back direction relative to the plunger 71 by more than a certain distance (approximately 15.0 mm) from the state in which the plunger 71 moves forward in the front-to-back direction relative to the driver blade 72 and the plunger 71 and the driver blade 72 are engaged.

[0112] Here, when the driver blade 72 is in an engaged state in which the engagement protrusion 71h is able to engage with both the first shoulder portion 72c and the second shoulder portion 72e, the plunger 71 moves forward in the front-to-rear direction relative to the driver blade 72, and the driver blade 72 has a slip-out prevention portion 72d that prevents the driver blade 72 from moving forward in the front-to-rear direction relative to the plunger 71 by more than a certain distance (approximately 15.0 mm) from the state in which the plunger 71 and the driver blade 72 are engaged.

[0113] The retaining portion 72d corresponds to the stopper portion in this invention.

[0114] This prevents the driver blade 72 from jumping out to the front side from the ejection portion 80. In other words, the retaining portion 72d has a function of preventing the driver blade 72 from jumping out from the ejection portion 80 when the jammed staple pieces SP are released.

[0115] In addition, the jammed staple piece SP can be released without making the distance (approximately 15.0 mm) between the first shoulder portion 72c and the second shoulder portion 72e of the driver blade 72 larger than the movable range (approximately 28.0 mm) of the plunger 71. Therefore, it is possible to avoid the driver blade 72 from becoming large.

[0116] In other words, the relative movement distance (approximately 15.0 mm) of plunger 71 with respect to driver blade 72 is less than the distance (approximately 28.0 mm) between the [top dead center] of plunger 71 moved by motor 61 and the [bottom dead center] of plunger 71 moved by drive spring 33.

[0117] Then, after the staple piece SP has been removed, the plunger 71 reaches position N, which is the [standby position], from position BD, which is the [bottom dead center], by the drive of the motor 61, as shown by the arrow M9 [to plunger standby position] in Fig. 16. At this time, the driver blade 72, which has become movable, is drawn into the inside of the ejection section 80 as the plunger 71 moves rearward, with the rear side surface SF2 (see Fig. 10) of the engaging protrusion 71h abutting against the second shoulder portion 72e.

[0118] 14, the pair of first fixing screws S1 are removed again, and the cover member RD is removed from the striking mechanism accommodating portion 23 of the housing 20 to expose the striking portion 70 to the outside. Next, the through hole 72f (see FIG. 5) of the driver blade 72 is aligned with the insertion hole 71g (see FIG. 5) of the plunger 71, and the fixing pin 73 is inserted into both the through hole 72f and the insertion hole 71g. This allows the plunger 71 and the driver blade 72 to move together.

[0119] In this manner, the fixing pin 73 is inserted into both the plunger 71 and the driver blade 72 from the top-bottom direction perpendicular to the front-rear direction, thereby engaging the plunger 71 and the driver blade 72. Here, the pin body 73a of the fixing pin 73 corresponds to the insertion portion in the present invention. The top-bottom direction corresponds to the second direction in the present invention.

[0120] Finally, the cover member RD is attached to the striking mechanism housing portion 23 and fixed with the pair of first fixing screws S1. This allows the electric tacker 10 to be completely restored to its normal state.

[0121] <Changes in specifications for electric tackers> 17 to 22 are perspective views illustrating the procedure for changing to an electric tacker of different specifications.

[0122] The electric tacker 10 of this embodiment is capable of handling two sizes of staples 11 (10 mm and 12 mm) by using the main body (housing 20) of the electric tacker 10 as a common part. The following describes the case where the electric tacker 10 is changed from the 12 mm specification to the 10 mm specification.

[0123] First, an ejection section assembly 90 (for 10 mm) equipped with an ejection section 80 and a driver blade 72 is prepared. In addition, a staple storage section 67 (for 10 mm) equipped with a pressing mechanism is prepared. Note that, although an ejection section assembly 90 for 12 mm is shown in FIG. 20, the ejection section assembly 90 for 10 mm has a similar shape. Also, although a staple storage section 67 for 12 mm is shown in FIG. 21 and FIG. 22, the staple storage section 67 for 10 mm has a similar shape.

[0124] 17, a pair of first fixing screws S1 are removed using a tool (not shown) such as a screwdriver. Next, as shown by arrow M10, the cover member RD is removed from the striking mechanism accommodating portion 23 of the housing 20. This causes the striking portion 70 accommodated inside the striking mechanism accommodating portion 23 to be exposed to the outside.

[0125] 18, the fixing pin 73 is removed using a tool such as a flat-head screwdriver (not shown) to remove the fixing pin 73. This separates the plunger 71 and the driver blade 72.

[0126] Furthermore, as shown by arrow M12 in Fig. 19, a pair of second fixing screws S2 are removed using a tool such as a screwdriver (not shown). Next, as shown by arrow M13 in Fig. 19, a pair of bolt nuts S3 are removed using a tool such as a screwdriver (not shown). This makes it possible to separate the injection unit assembly 90 (for 12 mm) from the impact mechanism accommodating portion 23 of the housing 20, as shown by arrow M14 in Fig. 20.

[0127] Furthermore, as shown by an arrow M15 in Fig. 21, a fixing member FM that is attached to the pair of support walls 24a, 24b of the drive mechanism housing portion 24 and that fixes the staple housing portion 67 to the pair of support walls 24a, 24b is operated. Specifically, as shown in Fig. 22, a tool TL such as a screwdriver having a flat head tip is used, and the tip of the tool TL is inserted into the recess H of the fixing member FM as shown by an arrow M16 in the figure.

[0128] Then, the fixing member FM is elastically deformed as shown by the arrow M15 in the figure. The fixing member FM is a press-formed product made of a thin steel plate and is elastically deformable by an external force. As a result, the staple accommodating portion 67 (for 12 mm) that is hooked on the fixing member FM and fixed to the pair of support walls 24a, 24b becomes slidable relative to the pair of support walls 24a, 24b.

[0129] Therefore, as shown by an arrow M17 in the figure, the staple accommodating portion 67 (for 12 mm staples) can be separated from the pair of support walls 24a, 24b without disassembling the housing 20 (see FIG. 1). Note that the right housing half 22 is not shown in FIG.

[0130] To mount the 10 mm ejection assembly 90 and staple accommodating portion 67 in the striking mechanism accommodating portion 23 of the housing 20 and the pair of support walls 24a, 24b, respectively, the above-described procedures may be carried out in reverse order.

[0131] As described above in detail, according to the electric tacker 10 of this embodiment, the striking section 70 has a plunger 71 that receives the biasing force of the drive spring 33, and a driver blade 72 that abuts against the staple 11 when striking, and the plunger 71 has a first engagement state in which it engages with the driver blade 72, and a second engagement state in which it engages with the driver blade 72 so as to be movable relative to the driver blade 72 by a fixed distance (approximately 15.0 mm) that is greater than the first engagement state.

[0132] As a result, when a broken staple piece SP is bitten, plunger 71 and driver blade 72 are separated to enter the second engagement state, allowing plunger 71 to move independently, and thus allowing driver blade 72 to be struck by plunger 71. Therefore, the action of electric tacker 10 itself makes it possible to easily release the bitten staple piece SP, improving the convenience of electric tacker 10.

[0133] In addition, according to the electric tacker 10 of this embodiment, the impact portion 70 is provided with a fixed pin 73 that engages the plunger 71 with the driver blade 72, an engagement protrusion 71h, and first and second shoulder portions 72c, 72e, and in a first engagement state, the plunger 71 and the driver blade 72 are engaged by the fixed pin 73, and in a second engagement state, the plunger 71 and the driver blade 72 are not engaged by the fixed pin 73, but the plunger 71 and the driver blade 72 are engaged by the engagement protrusion 71h and the first and second shoulder portions 72c, 72e.

[0134] As a result, the fixed pin 73 allows the plunger 71 and the driver blade 72 to move together, while the plunger 71 and the driver blade 72 can move relatively to each other by making the engaging protrusion 71h and the first and second shoulder portions 72c, 72e engageable without the fixed pin 73. In other words, the plunger 71 and the driver blade 72 can easily move together or relatively to each other by attaching or removing the fixed pin 73.

[0135] Furthermore, according to the electric tacker 10 of this embodiment, the engagement protrusion 71h and the first shoulder portion 72c apply the moving force of the plunger 71 to the driver blade 72 when the plunger 71 moves forward relative to the driver blade 72 in the front-to-rear direction.

[0136] That is, when the plunger 71 moves forward in the front-rear direction relative to the driver blade 72 in the second engaged state, the plunger 71 applies a moving force to the driver blade 72.

[0137] This makes it possible to easily release the bitten staple piece SP by the operation of the electric tacker 10 itself, thereby improving the convenience of the electric tacker 10.

[0138] In addition, according to the electric tacker 10 of this embodiment, the engagement protrusion 71h and the first and second shoulder portions 72c, 72e prevent the driver blade 72 from moving forward in the fore-and-aft direction relative to the plunger 71 more than a certain distance from a state in which the plunger 71 moves forward in the fore-and-aft direction relative to the driver blade 72 and the plunger 71 and the driver blade 72 are engaged with each other.

[0139] Specifically, in the second engagement state, the driver blade 72 has a slip-out prevention portion 72d that prevents the driver blade 72 from moving forward in the front-to-back direction relative to the plunger 71 more than a certain distance from a state in which the plunger 71 and the driver blade 72 are engaged with each other.

[0140] This makes it possible to prevent the driver blade 72 from jumping out forward from the ejection portion 80 after the staple piece SP has been released from its bitten state.

[0141] Furthermore, according to the electric tacker 10 of this embodiment, the engaging protrusion 71h has a front side surface SF1, and the front side surface SF1 is oriented forward in the front-rear direction and is capable of coming into contact with the driver blade 72.

[0142] This allows the face (front side surface SF1) to strike driver blade 72 when plunger 71 strikes driver blade 72. This prevents large stress from concentrating locally on engaging protrusion 71h, and protects engaging protrusion 71h from impact.

[0143] In addition, according to the electric tacker 10 of this embodiment, the fixing pin 73 has a pin body 73a that engages the plunger 71 and the driver blade 72 by being inserted into both the plunger 71 and the driver blade 72 from the up-down direction perpendicular to the front-to-rear direction.

[0144] This allows the plunger 71 and the driver blade 72, which move in the front-rear direction, to be supported by the pin body 73a without rattling in the front-rear direction. In addition, when the cover member RD is removed from the striking mechanism housing portion 23, the fixing pin 73 can be easily removed, and the plunger 71 and the driver blade 72 can be easily separated.

[0145] Furthermore, according to the electric tacker 10 of this embodiment, the relative movable distance (approximately 15.0 mm) of the plunger 71 with respect to the driver blade 72 is less than the distance (approximately 28.0 mm) between the "top dead center" of the plunger 71 moved by the motor 61 and the "bottom dead center" of the plunger 71 moved by the drive spring 33.

[0146] This makes it possible to release the jammed staple pieces SP without increasing the size of the driver blade 72.

[0147] Furthermore, according to the electric tacker 10 of this embodiment, the housing 20 is provided with an impact mechanism accommodating section 23 that movably holds the driver blade 72 that forms the impact portion 70 and to which an ejection portion 80 that ejects the staples 11 is attached, and a pair of support walls 24a, 24b that covers the staple accommodating section 67 in which the staples 11 are loaded, and the ejection portion 80 and the staple accommodating section 67 can be separated from the impact mechanism accommodating section 23 and the pair of support walls 24a, 24b, respectively, without disassembling the housing 20.

[0148] This allows the main body (housing 20) of the electric tacker 10 to be a common part and accommodate two sizes of staples 11 (10 mm and 12 mm). This makes it possible to further improve convenience.

[0149] Furthermore, according to the electric tacker 10 of this embodiment, the housing 20 has a left housing half 21 and a right housing half 22 that are divided in a direction intersecting both the front-to-rear direction and the axial direction of the rotation shaft 63a, and the left housing half 21 and the right housing half 22 sandwich an LED light 54 that illuminates the destination where the staples 11 are ejected, and an element case 51 that holds a microswitch 52 and a Hall element 53 that detects the state of the electric tacker 10.

[0150] This makes it possible to easily arrange the LED light 54 and the element case 51 inside the housing 20, and thus simplifies the assembly work of the electric tacker 10 (improved ease of assembly).

[0151] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the working machine of the present invention is not limited to the electric tacker 10 that shoots out the staples 11 as described above, but includes, for example, an impact tool that drives nails.

[0152] Furthermore, the material, shape, size, number, installation location, etc. of each component in the above-described embodiment may be arbitrary as long as it achieves the present invention, and is not limited to the above-described embodiment. [Explanation of symbols]

[0153] 10... Electric stapler (working machine), 11... Staple (fastener), 20... Housing, 21... Left housing half (first housing half), 21a... Left element unit mounting portion, 22... Right housing half (second housing half), 22a... Right element unit mounting portion, 23... Impact mechanism accommodating portion (mounting portion), 24... Drive mechanism accommodating portion, 24a,24b...support wall (covering portion), 25...substrate accommodating portion, 26...handle portion, 27...opening, 30...impact mechanism, 31...support shaft, 31a...spring seat, 32...support rail, 33...driving spring (biasing portion), 34...driving gear, 34a...small cam roller, 34b...large cam roller, 35...damper member, 36...gear holder, 40...push lever, 41...lever body, 42...switch operating portion, 43...return spring, 50...element unit, 51...element case, 51a...bottom wall portion, 51b...front wall portion, 51c ...upper wall portion, 51d...rear wall portion, 51e...notch portion, 51f...hall element fixing portion, 52...microswitch (element), 52a...operation button, 52b...lever member, 53...hall element (element), 53a...sensor board, 54...LED light (illumination portion), 55...trigger switch, 56...trigger, 60...driving mechanism, 61...motor (driving portion), 62...stator, 63...rotor, 63a...rotating shaft, 64...control board, 65...planetary gear reducer, 67...staple storage portion (magazine), 67a...stop lever Bar, 70... striking portion, 71... plunger (base portion), 71a... insertion hole, 71b... plunger body, 71c... guide arm portion, 71d... first engaging protrusion, 71e... second engaging protrusion, 71f... blade fixing portion, 71g... insertion hole, 71h... engaging protrusion (second engaging portion), 72... driver blade (contact portion), 72a... wide body portion, 72b... narrow portion, 72c... first shoulder portion (second engaging portion), 72d... stopper portion, 72e... second shoulder portion (second engaging portion), 72f... through hole, 73... fixing pin (first Engagement portion), 73a...pin body (insertion portion), 73b...pin head portion, 80...ejection portion, 90...ejection portion assembly, BP...battery pack, BT...lock release button, CR...carrier, FM...fixing member, H...recess, M...mate member, MG...magnet, PG...planetary gear, PN...pinion, RD...cover member, RG...ring gear, S1...first fixing screw, S2...second fixing screw, S3...bolt nut, SF1...front surface (contact surface), SF2...rear surface, SG...sun gear, SP...staple piece, TL...tool,

Claims

1. A striking portion that strikes the fastener; a biasing portion that biases the striking portion to one side in a first direction; a drive unit that moves the impact unit toward the other side in the first direction against the biasing force of the biasing unit; Equipped with The striking part is A base portion that receives the biasing force of the biasing portion; a contact portion that contacts the stopper when struck; having The base portion has a first engagement state in which the base portion engages with the abutment portion, and a second engagement state in which the base portion engages with the abutment portion so as to be movable relatively to the abutment portion by a certain distance larger than the first engagement state. Work machine.

2. the striking portion includes a first engaging portion and a second engaging portion that engage the base portion and the abutment portion; In the first engagement state, the base portion and the abutment portion are engaged with each other by the first engagement portion, In the second engagement state, the base portion and the abutment portion are not engaged with each other by the first engagement portion, and the base portion and the abutment portion are engaged with each other by the second engagement portion. The work machine according to claim 1.

3. the second engagement portion applies a moving force of the base to the abutment portion when the base moves relatively to one side in the first direction with respect to the abutment portion. The work machine according to claim 2.

4. the second engaging portion prevents the abutment portion from moving relatively to the base in the one side in the first direction by a certain distance or more from a state in which the base moves relatively to the abutment portion in the one side in the first direction and the base and the abutment portion are engaged with each other. The work machine according to claim 3.

5. The second engagement portion includes a contact surface provided on the base portion, and the contact surface is oriented toward one side in the first direction and is capable of contacting the abutment portion. The work machine according to claim 2.

6. the first engagement portion includes an insertion portion that is inserted into both the base portion and the abutment portion from a second direction perpendicular to the first direction to engage the base portion and the abutment portion; The work machine according to claim 2.

7. When the base portion moves relative to the abutment portion in one side in the first direction in the second engaged state, the base portion applies a moving force of the base to the abutment portion. The work machine according to claim 1.

8. the abutment portion has a stopper portion that prevents the abutment portion from moving relative to the base portion in one direction in the first direction by a certain distance or more from a state in which the base portion moves relative to the abutment portion in one direction in the first direction and the base portion and the abutment portion are engaged with each other in the second engagement state. A work machine according to claim 7.

9. a relative movable distance of the base with respect to the abutment portion is equal to or less than a distance between a top dead center of the base moved by the drive portion and a bottom dead center of the base moved by the biasing portion; The work machine according to claim 1.

10. a housing is provided that accommodates the base portion that forms the striking portion, the biasing portion that biases the base portion, and the drive portion that moves the base portion against the biasing force of the biasing portion; The housing includes: a mounting portion that movably holds the contact portion that forms the striking portion and to which an ejection portion that ejects the fastener is attached; a cover portion for covering a magazine in which the fastener is loaded; Equipped with The ejection unit and the magazine are separable from the mounting unit and the covering unit, respectively, without disassembling the housing. The work machine according to claim 1.

11. a housing is provided that accommodates the base portion that forms the striking portion, the biasing portion that biases the base portion, and the drive portion that moves the base portion against the biasing force of the biasing portion; The housing includes: a first housing half and a second housing half that are divided in a direction intersecting both the first direction and an axial direction of a rotation shaft provided in the drive unit; The first housing half and the second housing half sandwich an illumination unit that illuminates an ejection destination of the fastener and an element case that holds a plurality of elements that detect a state of the work machine. The work machine according to claim 1.

Images