Work equipment

Abstract

To improve the usability of the work equipment. [Solution] The driving machine includes an injection unit, a striking unit 5 that strikes a fastener supported by the injection unit, a biasing unit that biases the striking unit 5 downward, and a pinwheel 25 that rotates while engaged with the striking unit 5, thereby moving the striking unit 5 upward against the biasing force of the biasing unit, and then disengaging from the striking unit 5, thereby moving the striking unit 5 downward due to the biasing force of the biasing unit. The pinwheel 25 can be in multiple states, including an engageable state in which it can engage with the striking unit 5, and an unengageable state in which it cannot engage with the striking unit 5. The driving machine has a switching unit 32 that contacts the pinwheel 25 to set the state of the pinwheel 25 according to the rotational position of the pinwheel 25.

Description

Technical Field

[0001] The present invention relates to a working machine such as a driving machine.

Background Art

[0002] As an example of a working machine, a driving machine having a driver blade for striking a fastener, a pin wheel for pushing up the driver blade, and a motor for rotating the pin wheel is known.

[0003] As such a driving machine, for example, Patent Document 1 discloses a driving machine provided with a mechanism in which a rack provided on a driver blade and a pin provided on a pin wheel are engaged, and after driving, the driver blade is pushed up by the rotation of the pin wheel.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the driving machine described in Patent Document 1 above, after the driver blade has struck, it may collide with a bumper at the bottom dead center and bounce. When the driver blade bounces, the rack may be positioned above the original state where the driver blade is located at the bottom dead center.

[0006] When the pin wheel rotates to a position where it can engage with the rack in a state where the rack of the driver blade is positioned above the original position as described above, there is a risk that the rack and the pin wheel will collide and be damaged. For this reason, there has been a demand to suppress the collision between the rack and the pin wheel and improve convenience.

[0007] The objective of this invention is to provide a work machine with improved convenience. [Means for solving the problem]

[0008] A working machine according to one embodiment includes an injection unit, a striking unit that strikes a fastener supported by the injection unit by moving to one side in a first direction, a biasing unit that biases the striking unit to one side in the first direction, and a rotating unit that rotates while engaged with the striking unit, thereby moving the striking unit to the other side in the first direction against the biasing force of the biasing unit, and disengaging from the striking unit, thereby moving the striking unit to one side in the first direction by the biasing force of the biasing unit, wherein the rotating unit can be in multiple states, including an engageable state in which it can engage with the striking unit and an unengageable state in which it cannot engage with the striking unit, and has a switching unit that contacts the rotating unit to set the state of the rotating unit according to the rotational position of the rotating unit.

[0009] The work machine of another embodiment includes an injection unit, a striking unit that strikes a fastener supported by the injection unit by moving to one side in a first direction, a biasing unit that biases the striking unit to one side in the first direction, and a rotating unit that rotates while engaged with the striking unit, thereby moving the striking unit to the other side in the first direction against the biasing force of the biasing unit, and then disengaging from the striking unit, thereby moving the striking unit to one side in the first direction by the biasing force of the biasing unit to reach the bottom dead center, wherein the rotating unit can be in a plurality of states, including an engageable state in which it can engage with the striking unit and an unengaged state in which it cannot engage with the striking unit, and has a maintenance mechanism that maintains the rotating unit in the unengaged state for a predetermined time after the engagement of the rotating unit with the striking unit is disengaged and the striking unit moves to the bottom dead center.

[0010] The work machine of another embodiment includes an injection unit, a striking unit that strikes a fastener supported by the injection unit by moving to one side in a first direction, a biasing unit that biases the striking unit to one side in the first direction, and a rotating unit that rotates while engaged with the striking unit, thereby moving the striking unit to the other side in the first direction against the biasing force of the biasing unit, and then disengaging from the striking unit, thereby moving the striking unit to one side in the first direction by the biasing force of the biasing unit, wherein the rotating unit includes a rotating base that rotates about a rotation axis, and a rotating unit that rotates about the rotation axis relative to the rotating base. The device includes a movable engaging portion that is mounted so as to be relatively movable in the radial direction, which does not engage with the striking portion when positioned in the inner position in the radial direction, and engages with the striking portion when positioned in the outer position in the radial direction, and a switching portion for setting the position of the movable engaging portion, wherein the switching portion is movable between an operating position in which it contacts the movable engaging portion and positions the movable engaging portion in the inner position, and a non-operating position in which the movable engaging portion is not positioned in the inner position, and has an auxiliary switching portion that moves the switching portion in the operating position to the non-operating position by receiving power from the rotation of the rotating portion. [Effects of the Invention]

[0011] According to the present invention, the convenience of the work machine can be improved. [Brief explanation of the drawing]

[0012] [Figure 1] This is a side view showing the structure of the work machine according to Embodiment 1 of the present invention. [Figure 2] This is a side view showing a partially cutaway section of the work machine in Figure 1. [Figure 3] Figure 1 is a partial perspective view showing the structure of the rotating part and switching part incorporated into the work machine. [Figure 4] Figure 3 is a partial perspective view of the structure as seen from the switching section side. [Figure 5] Figure 1 is a partial side view showing the state of the rotating part and switching part of the work machine in the standby position. [Figure 6] Figure 1 is a partial side view showing the state of the rotating part and switching part at the top dead center of the work machine. [Figure 7] It is a partial side view showing the state of the rotating part and the switching part at the bottom dead center of the working machine in FIG. 1. [Figure 8] It is a partial side view showing the state of the rotating part and the switching part when the blade of the working machine in FIG. 1 bounces. [Figure 9] It is a partial side view showing the state of the rotating part and the switching part when the blade of the working machine in FIG. 1 bounces. [Figure 10] It is a partial side view showing the state of the rotating part and the switching part during the re-lift-up of the working machine in FIG. 1. [Figure 11] It is a partial perspective view showing the structure of the rotating part and the switching part incorporated in the working machine according to the second embodiment of the present invention. [Figure 12] It is a partial perspective view of the structure in FIG. 11 seen from the switching part side. [Figure 13] It is a partial side view of the working machine in FIG. 11 seen from the front side with the first arm pushing the movable pin in. [Figure 14] It is a partial side view of the working machine in FIG. 11 seen from the front side with the rotating part abutting on the third arm. [Figure 15] It is a partial side view of the working machine in FIG. 11 seen from the front side with the first arm returned to its original position by the third arm. [Figure 16] It is a partial side view of the working machine in FIG. 11 seen from the rear side with the fourth arm pushing the movable pin in. [Figure 17] It is a partial side view of the working machine in FIG. 11 seen from the rear side with the rotating part abutting on the sixth arm. [Figure 18] It is a partial side view of the working machine in FIG. 11 seen from the rear side with the fifth arm returned to its original position by the sixth arm. [Figure 19] It is a partial side view showing the state of the rotating part and the switching part at the standby position of the working machine according to the third embodiment of the present invention. [Figure 20] It is a partial side view showing the state of the rotating part and the switching part at the top dead center of the working machine in FIG. 19. [Figure 21]It is a partial side view showing the state of the rotating part and the switching part at the bottom dead center of the working machine in FIG. 19. [Figure 22] It is a partial side view showing the state of the rotating part and the switching part of the working machine in FIG. 19 during blade bounce. [Figure 23] It is a partial side view showing the state of the rotating part and the switching part of the working machine in FIG. 19 during blade bounce. [Figure 24] It is a partial side view showing the state of the rotating part and the switching part of the working machine in FIG. 19 during re-lift up. [Figure 25] It is a partial perspective view showing the structure of the rotating part and the switching part heading towards the bottom dead center in the working machine of the modification of Embodiment 3 of the present invention. [Figure 26] It is a partial side view showing the state of the rotating part and the switching part at the bottom dead center of the working machine in FIG. 25. [Figure 27] It is a partial side view showing the state of the rotating part and the switching part of the working machine in FIG. 25 during re-lift up.

Embodiments for Carrying out the Invention

[0013] The working machine of the embodiment of the present invention will be described with reference to the drawings.

[0014] (Embodiment 1) In the present Embodiment 1, as an example of a working machine, a driving machine 1 is taken up, and further, as an example of a fastener, a nail 3 is taken up for explanation.

[0015] As shown in Figures 1 and 2, the driving machine 1 has a cylinder case 2, a motor case 4, and a handle 6. One end of the motor case 4 and the handle 6 is connected to the cylinder case 2, and the other end of the motor case 4 and the handle 6 is connected to the connecting part 8. In other words, one end of the motor case 4 and the handle 6 are connected to each other via the cylinder case 2, and the other end of the motor case 4 and the handle 6 are connected to each other via the connecting part 8. That is, the cylinder case 2, the motor case 4, the handle 6, and the connecting part 8 are an integrated unit. Therefore, in the following description, the cylinder case 2, the motor case 4, the handle 6, and the connecting part 8 may be collectively referred to as the "housing 10".

[0016] The housing 10 is composed of two housing members made of synthetic resin such as nylon or polycarbonate. Specifically, the housing 10, which includes the cylinder case 2, motor case 4, handle 6, and connecting part 8, is formed by two housing members that are butted against each other.

[0017] Here, the longitudinal direction of the cylinder case 2 is defined as "up-down direction (first direction) X1," and the longitudinal direction of the motor case 4 is defined as "front-back direction Y1." Furthermore, the direction perpendicular to the up-down and front-back directions is defined as "left-right direction Z1." However, these definitions are merely for the sake of explanation.

[0018] According to the above definition, the motor case 4 is located below the handle 6 and extends rearward from the cylinder case 2. On the other hand, the handle 6 is located above the motor case 4 and extends diagonally upward from the cylinder case 2 towards the rear.

[0019] Furthermore, the cylinder case 2 houses the cylinder 20. In addition, the cylinder 20 houses the piston 21. The piston 21 housed in the cylinder 20 reciprocates within the cylinder 20 in the axial direction (vertical direction X1) of the cylinder 20. Inside the cylinder 20, the inner surface of the cylinder 20 and the upper surface of the piston 21 form the piston upper chamber 22. The volume of the piston upper chamber 22 increases or decreases with the reciprocating motion (vertical motion) of the piston 21. Specifically, the volume of the piston upper chamber 22 is minimum when the piston 21 is at top dead center and maximum when the piston 21 is at bottom dead center.

[0020] A driver blade 23 is connected to the lower surface of the piston 21. The driver blade 23 is integrated with the piston 21 and reciprocates (moves up and down) together with the piston 21. The driver blade 23 moves downward and collides with the nail 3, striking the nail 3. In other words, the driver blade 23 is a component that strikes the nail 3 in the downward direction (first direction) X1, and corresponds to the striking part 5 of the present invention. Furthermore, the downward direction (one side) of the vertical direction (first direction) X1 in this embodiment 1 coincides with the direction in which the driver blade 23 strikes the nail 3.

[0021] A damper 24 made of rubber or urethane is provided at the bottom of the cylinder 20. The damper 24 receives the piston 21 when it reaches bottom dead center, preventing a collision between the bottom of the cylinder 20 and the piston 21. A driver blade 23 extending downward from the piston 21 passes through the damper 24 and the cylinder 20 and protrudes downward from the cylinder 20.

[0022] In this embodiment 1, the piston 21 and driver blade 23, which are molded separately, are connected and integrated, but the piston 21 and driver blade 23 may be molded as a single unit.

[0023] As shown in Figure 1, a magazine 12 is attached to the side of the housing 10. Meanwhile, below the cylinder case 2, an injection passage 31 is provided as shown in Figure 2. The magazine 12 is capable of holding multiple nails 3 and is equipped with a supply mechanism such as a feeder (not shown) that supplies the multiple nails 3 contained within to the injection passage 31 one by one. The injection passage 31 is formed by multiple members (injection passage forming members), including a blade guide 28 (see Figure 3) that extends downward from the cylinder case 2.

[0024] The driver blade 23 strikes the nail 3 that has been fed into the injection passage 31, which is formed by an injection passage forming member including a blade guide 28. The nail 3 struck by the driver blade 23 passes through the injection passage 31 and is ejected from the injection passage 31. In other words, the striking unit 5 strikes the nail 3 supported by the ejection unit 34 by moving downward (one side) in the vertical direction (first direction) X1. The magazine 12 supplies the nails 3 contained in the magazine 12 to the ejection unit 34.

[0025] Furthermore, a pinwheel (rotating part) 25 is provided to move the piston 21 from the bottom dead center side to the top dead center side. The pinwheel 25 is fixed to a drive shaft 14 which is rotationally driven by a motor 13. The pinwheel 25 has a plurality of pins provided at predetermined intervals along the circumferential direction (direction of rotation). On the other hand, the driver blade 23 has a plurality of racks 23a that can engage with the pins of the pinwheel 25, provided at predetermined intervals along the axial direction (vertical direction X1). In other words, the pinwheel 25 is a rotating part that, when engaged with the striking part 5, moves the striking part 5 upward (to the other side) in the vertical direction X1 against the biasing force of the biasing part (pressure accumulation chamber 26, described later), and when disengaged from the striking part 5, moves the striking part 5 downward in the vertical direction X1 due to the biasing force of the biasing part.

[0026] The rotational driving force output from the motor 13 housed in the motor case 4 is transmitted to the drive shaft 14 to which the pinwheel 25 is attached via a planetary gear type reduction mechanism 15. The motor 13 is an electric brushless motor powered by electricity supplied from a battery 16 mounted on the rear of the housing 10 (the back of the connecting section 8). The connecting section 8 has a built-in controller 17 as the control unit. The controller 17 is a microcomputer composed of a CPU, ROM, RAM, etc., which controls the start / stop, rotation amount, rotation speed, etc. of the motor 13 according to predetermined conditions. The controller 17 is electrically connected to the motor 13 via wiring.

[0027] A chamber 26a forming a pressure accumulator 26 is provided above the cylinder 20. The pressure accumulator 26 is a biasing section that biases the striking section 5 downward in the vertical direction X1. The pressure accumulator 26 is in communication with the piston upper chamber 22. In this embodiment 1, the diameter of the chamber 26a is larger than the diameter of the cylinder 20. In this embodiment, where the chamber 26a has a larger diameter than the cylinder 20, the required volume of the pressure accumulator 26 is secured while keeping the overall height of the driving machine 1, including the cylinder 20 and the chamber 26a, low.

[0028] The piston upper chamber 22 and the pressure accumulator chamber 26 are filled with high-pressure gas (compressed air in this embodiment 1). When the piston 21 is moved from the bottom dead center side to the top dead center side (when the piston 21 is raised), the motor 13 rotates forward under the control of the controller 17. When the motor 13 rotates forward, the pinwheel 25 rotates in a predetermined direction.

[0029] As the pinwheel 25 begins to rotate, the multiple pins on the pinwheel 25 sequentially engage with the multiple racks 23a on the driver blade 23. Subsequently, as the pinwheel 25 rotates until the pin furthest downstream in the rotational direction engages with the lowest rack in the vertical direction X1, the piston 21 is pushed up to top dead center.

[0030] As the piston 21 is pushed up as described above, the compressed air in the piston upper chamber 22 is sent to the pressure accumulator chamber 26 and further compressed. Subsequently, as the pin wheel 25 rotates further, the engagement between the pin on the pin wheel 25 and the rack 23a on the driver blade 23 is released. Then, the pressure of the compressed air (air pressure) in the piston upper chamber 22 and the pressure accumulator chamber 26 causes the piston 21 to move from top dead center to bottom dead center, and the driver blade 23 to move downward. In other words, the piston 21 and the driver blade 23 descend.

[0031] The descending driver blade 23 strikes the nail 3 in the ejection passage 31. The tip of the ejection section 34 is provided with a push lever 29 that can move vertically, and the nail 3 struck by the driver blade 23 is ejected from the ejection passage 31 and driven into the mating material 100 guided by the push lever 29.

[0032] Next, the structure of the rotating part and switching part of the driving machine 1 will be described using Figures 3 and 4. In this embodiment 1, the pin wheel (rotating part) 25 can be in multiple states, including an engageable state in which it can engage with the striking part 5, and an unengageable state in which it cannot engage with the striking part 5. Furthermore, the driving machine 1 has a switching part 32 that sets the state of the pin wheel 25 according to the rotational position of the pin wheel 25 by contacting the pin wheel 25. In this embodiment 1, the case in which all the pins provided on the pin wheel 25 are movable will be described.

[0033] As shown in Figure 3, the pinwheel 25 includes a disc (rotating base) 25b that rotates about a rotation axis 25a, and a movable pin (movable engaging part) 25c that is mounted on the disc 25b so as to be able to move relative to it in the radial direction about the rotation axis 25a, and which does not engage with the striking part 5 when positioned in the inner position in the radial direction, and engages with the striking part 5 when positioned in the outer position in the radial direction.

[0034] Specifically, the pinwheel 25 has two discs (rotating bases) 25b arranged opposite each other, and a plurality of movable pins 25c are arranged at equal intervals in the rotational direction R1 of the pinwheel 25 (see Figure 5) so as to bridge the gap between these two discs 25b. In this embodiment 1, as an example, we will describe the case in which the pinwheel 25 is provided with seven movable pins 25c.

[0035] In the pin wheel 25 of this embodiment 1, all pins are movable pins 25c and are arranged at equal intervals. Each movable pin 25c is positioned in a groove 25h formed substantially radially from the periphery of the disc 25b toward the central axis of rotation 25a, and is movable from an outer position to an inner position within the groove 25h. That is, the groove 25h is an elongated hole formed substantially radially from the periphery of the disc 25b, and each movable pin 25c is movable within this elongated hole. When all pins are movable pins 25c and are arranged at equal intervals, the correspondence between the pins and the rack 23a of the driver blade 23 is eliminated, thus eliminating the mis-engagement phenomenon that occurs between the pins and the rack 23a. Each movable pin 25c is biased to always be positioned outside the groove 25h (elongated hole) by a spring 25d attached to a support portion 25e provided next to each movable pin 25c.

[0036] Furthermore, the disc 25b has protruding portions 25f that project radially outward from the disc 25b and abut against the switching portion 32. In other words, the protruding portions 25f are the parts that protrude radially outward from the disc 25b. Note that the same number of protruding portions 25f are provided as the number of movable pins 25c. Therefore, in this embodiment 1, since there are 7 movable pins 25c, there are also 7 protruding portions 25f provided on the outer circumference of the disc 25b.

[0037] On the other hand, the switching unit 32 of this embodiment 1 is an arm that switches the state of the pinwheel 25 (engageable state and unengageable state) by contacting the striking unit 5 and operating. Specifically, as shown in Figures 3 to 5, the switching unit 32 has a first link 32h that operates by contacting the striking unit 5 and a second link 32i that operates by contacting the pinwheel 25. The first link 32h and the second link 32i are able to operate independently of each other.

[0038] Here, the first link 32h includes a first arm 32a that can engage with the movable pin 25c and an engaging portion 32k that can engage with the striking portion 5. The first arms 32a are provided one on the outside of each of the two discs 25b, corresponding to the two discs 25b, and the two first arms 32a positioned on the outside of the two discs 25b are connected by a connecting bar 32f. The two first arms 32a are arranged to rotate in conjunction with each other around the rotation axis 33. The engaging portion 32k of the first link 32h is also arranged to rotate around the rotation axis 33 and can engage with the rib 23b of the driver blade 23 (striking portion 5). The first arm 32a has a contact portion 32d that contacts the movable pin 25c.

[0039] On the other hand, the second link 32i includes a second arm 32b that can engage with the movable pin 25c, and an engaging portion 32j that can engage with a projection 25f on the outer circumference of the disc 25b. The second arms 32b are also provided one on the outside of the two discs 25b and one inside of the two first arms 32a, corresponding to the two discs 25b. In other words, each of the two second arms 32b is provided inside the first arms 32a. The two second arms 32b, which are located on the outside of the two discs 25b and inside the two first arms 32a, are connected by a connecting bar 32g, and the two second arms 32b are provided to rotate in conjunction around the rotation axis 33. The engaging portion 32j of the second link 32i is also provided to rotate around the rotation axis 33 and is capable of engaging with the projection 25f on the outer circumference of the disc 25b. The second arm 32b has a contact portion 32e that contacts the movable pin 25c.

[0040] Furthermore, as shown in Figure 3, the contact portion 32d of the first arm 32a has a protruding portion 32c that extends toward the second arm 32b. The protruding portion 32c is the part of the side of the contact portion 32d of the first arm 32a that protrudes inward (towards the second arm 32b), and is the part that can rest on and support the second arm 32b when the first arm 32a rotates toward the pin wheel 25. In other words, when the first arm 32a rotates toward the pin wheel 25, the second arm 32b is hooked onto and supported by this protruding portion 32c, and the second arm 32b rotates together with the first arm 32a while being supported by it.

[0041] The first arm 32a is always biased to rotate away from the pinwheel 25 by the torsion spring 35a shown in Figure 4. Similarly, the second arm 32b is also always biased to rotate away from the pinwheel 25 by the torsion spring 35b.

[0042] Next, the operation of the pin wheel 25, the driver blade 23 (striking part 5), and the switching part 32 will be explained.

[0043] First, in the [standby position] shown in Figure 5, the driver blade 23 is raised to near top dead center, and the movable pin 25c of the pinwheel 25 and the rack 23a of the driver blade 23 are not engaged. At this time, the first arm 32a is positioned away from the pinwheel 25 due to the biasing force of the torsion spring 35a, because the engaging portion 32k of its first link 32h is not engaged with the rib 23b of the driver blade 23. Similarly, the second arm 32b is also positioned away from the pinwheel 25 due to the biasing force of the torsion spring 35b, because the engaging portion 32j of its second link 32i is not engaged with the pinwheel 25.

[0044] Next, as the pinwheel 25 continues to rotate in the rotational direction R1, the movable pin 25c(A1) of the pinwheel 25 engages with the rack 23a of the driver blade 23, pushing the driver blade 23 upward toward the top dead center.

[0045] At this time, the first arm 32a comes into contact with the rib 23b of the driver blade 23 as the driver blade 23 moves upward in the vertical direction X1. That is, as the driver blade 23 moves upward in the vertical direction X1, the engaging portion 32k of the first link 32h of the first arm 32a engages with the rib 23b of the driver blade 23. As a result, the first arm 32a, in conjunction with the second arm 32b, comes into contact with the movable pin 25c against the biasing force of the torsion spring 35a, and presses the movable pin 25c(B1) toward the center of the disc 25b. That is, the first arm 32a positions the movable pin 25c radially inward. At the same time, the second arm 32b, supported by the protruding portion 32c of the first arm 32a, also presses the movable pin 25c(B1) together with the first arm 32a against the biasing force of the torsion spring 35b.

[0046] Subsequently, at the top dead center shown in Figure 6, the engagement portion 32k of the first arm 32a remains in contact with the rib 23b of the driver blade 23, and the driver blade 23 is pushed upward in the direction U1 to reach the top dead center. When the driver blade 23 reaches the top dead center, the engagement between the driver blade 23 and the pin wheel 25 is released, and the driver blade 23 is released. Immediately after the driver blade 23 is released, the engagement between the engagement portion 32k of the first arm 32a and the rib 23b of the driver blade 23 is also released, and the biasing force of the torsion spring 35a causes the first arm 32a to rotate away from the pin wheel 25 and return to the standby position.

[0047] At this time, when the engagement between the engaging portion 32k of the first arm 32a and the rib 23b of the driver blade 23 is released, the engaging portion 32j of the second arm 32b engages with the protruding portion 25f of the pin wheel 25, maintaining contact with the movable pin 25c(B1) and pressing the movable pin 25c toward the center of the disc 25b. In other words, after the engagement between the engaging portion 32k of the first arm 32a and the rib 23b of the driver blade 23 is released, the second arm 32b comes into contact with the protruding portion 25f of the pin wheel 25.

[0048] At top dead center, the engagement of the pinwheel 25 with the driver blade 23 is released, and the released driver blade 23 moves downward in the vertical direction X1. At this time, the second arm 32b maintains the pinwheel 25 in a disengaged state for a predetermined time even after the driver blade 23 has moved downward. That is, even when the driver blade 23 moves downward, the second arm 32b remains engaged with the protrusion 25f of the pinwheel 25, maintaining contact with the movable pin 25c (B1) and pressing the movable pin 25c toward the center of the disc 25b. In other words, the second arm 32b maintains contact with the movable pin 25c for a predetermined time so as to maintain a disengaged state in which the pinwheel 25 cannot engage with the driver blade 23.

[0049] The driver blade 23 then strikes the nail 3 (see Figure 1) and reaches the bottom dead center shown in Figure 7. Even when the driver blade 23 has moved downward in direction D1 and reached the bottom dead center, the second arm 32b continues to press the movable pin 25c(B1) toward the center of the disc 25b because its engaging portion 32j is engaged with the protruding portion 25f of the pinwheel 25. In other words, the second arm 32b maintains a state in which the movable pin 25c(B1) is released so that it does not collide with the driver blade 23. As a result, the pinwheel 25 is also in a state where it cannot engage with the driver blade 23.

[0050] As shown in Figure 8, the driver blade 23, having reached its bottom dead center, bounces upward in the direction U1 due to the [bouncing (rising)]. That is, after the driver blade 23 reaches its bottom dead center, it collides with the damper 24 (see Figure 2), then bounces back and moves upward in the direction U1. The pinwheel 25 continues to rotate in the rotation direction R1. At this time, as described above, the second arm 32b maintains a state in which its engaging portion 32j is engaged with the protruding portion 25f of the pinwheel 25, pressing the movable pin 25c (B1) toward the center of the disc 25b, and the state in which the pinwheel 25 cannot engage with the driver blade 23 is also maintained. As a result, even if the driver blade 23 moves upward in the direction U1, collision between the driver blade 23 and the movable pin 25c of the pinwheel 25 can be avoided.

[0051] The driver blade 23 bounces several times at high speed. That is, after rising, it descends in the downward direction D1 by bouncing (descending), as shown in Figure 9. At this time, as described above, the second arm 32b maintains a state in which its engaging portion 32j is still engaged with the protruding portion 25f of the pinwheel 25, pressing the movable pin 25c (B1) toward the center of the disc 25b, and the state in which the pinwheel 25 cannot engage with the driver blade 23 is also maintained. As a result, even if the driver blade 23 bounces and moves in the downward direction D1, a collision between the driver blade 23 and the movable pin 25c of the pinwheel 25 can be avoided.

[0052] In other words, even when the driver blade 23 is bouncing up and down, the second arm 32b maintains a state in which the movable pin 25c is pressed toward the center of the disc 25b by its engaging portion 32j engaging with the protruding portion 25f of the pin wheel 25. As a result, the state in which the pin wheel 25 cannot engage with the driver blade 23 is maintained, and as a result, even if the driver blade 23 bounces up and down, collision between the driver blade 23 and the movable pin 25c of the pin wheel 25 can be avoided.

[0053] Subsequently, the up-and-down movement (bouncing) of the driver blade 23 stops, and as shown in Figure 10, the pinwheel 25 performs a [re-lift-up]. At this time, the second arm 32b returns to its standby position along with the first arm 32a because its engagement portion 32j is disengaged from the protruding portion 25f of the pinwheel 25. That is, the movable pin 25c(B1) of the pinwheel 25 is not engaged with the driver blade 23. In this state, the next movable pin 25c(C1) of the pinwheel 25 re-engages with the rack 23a of the driver blade 23, and the driver blade 23 begins to be pushed up.

[0054] The movable pin 25c is positioned to engage with the driver blade 23 when the angle of the disc 25b around the rotation axis 25a is within a first angular range, while it is positioned to be incompatible with the driver blade 23 when the angle of the disc 25b is within a second angular range. That is, when the driver blade 23 is at top dead center, bottom dead center, bound (up), and bound (down), the movable pin 25c and the rack 23a of the driver blade 23 can engage, so the angle of the disc 25b is within the first angular range. When the driver blade 23 is at standby position and stopped (re-lifted), the movable pin 25c and the rack 23a of the driver blade 23 do not engage, so the angle of the disc 25b is within the second angular range. Therefore, in order to avoid collision between the rack 23a of the driver blade 23 and the pinwheel 25 when the angle of the disc 25b is within the first angular range, it is necessary to ensure that the movable pin 25c of the pinwheel 25 and the rack 23a of the driver blade 23 cannot engage with each other.

[0055] Therefore, in the driving machine 1, the switching unit 32 (first arm 32a, second arm 32b) contacts the movable pin 25c when the disc 25b is in the first angular range, thereby positioning the movable pin 25c radially inward and preventing the pin wheel 25 from engaging with the driver blade 23.

[0056] In other words, when the angle of the disc 25b is within the first angular range, the movable pin 25c is normally positioned to engage with the driver blade 23. However, the driving machine 1 is equipped with a switching unit 32 (first arm 32a, second arm 32b), which positions the movable pin 25c radially inward, thereby disengaging the pin wheel 25 from the driver blade 23. To put it another way, the driving machine 1 has a maintenance mechanism 36 (first arm 32a, second arm 32b) that maintains the pin wheel 25 in a disengaged state for a predetermined time after the engagement of the pin wheel 25 with the driver blade 23 is released and the driver blade 23 moves to its bottom dead center. When the angle of the disc 25b is within the second angular range, the movable pin 25c is positioned in a way that disengages it from the driver blade 23.

[0057] As described above, in the driving machine 1 of this embodiment 1, even when the driver blade 23 is bouncing, and the pin wheel 25 rotates to a position where it can engage with the rack 23a of the driver blade 23, the movable pin 25c is pressed by the switching unit 32 (first arm 32a, second arm 32b), and the movable pin 25c is positioned radially inward. This makes it possible to avoid collision between the rack 23a of the driver blade 23 and the pin wheel 25. As a result, damage to the rack 23a of the driver blade 23 and the pin wheel 25 can be suppressed, and the convenience of the driving machine 1 can be improved.

[0058] Even when all the pins of the pinwheel 25 are movable, the movable pins 25c do not immediately return to their original position while the driver blade 23 is bouncing. Instead, they are pressed by the switching section 32 (first arm 32a, second arm 32b) and positioned radially inward. This prevents collision between the rack 23a of the driver blade 23 and the pinwheel 25, improving the usability of the driving machine 1.

[0059] (Embodiment 2) The implement of this second embodiment will now be described. The implement of this second embodiment is the same as the driving machine 1 shown in Figures 1 and 2. Therefore, in describing the driving machine 1 of the second embodiment, only the differences in structure from the driving machine 1 of the first embodiment will be described, and the description of parts that overlap with the structure of the driving machine 1 of the first embodiment will be omitted.

[0060] The difference between the driving machine 1 of this second embodiment and the driving machine 1 of the first embodiment is the structure of the switching unit 42 that sets the position of the movable pin (movable engaging part) 25c of the pin wheel 25 shown in Figures 11 and 12, and the provision of an auxiliary switching unit that moves the switching unit 42.

[0061] The switching unit 42 of this second embodiment will now be described. In Figures 13, 14, 16 to 18, the first arm 42a and the fourth arm 44 are drawn with dotted lines to make the drawings easier to understand. The switching unit 42 is movable between an operating position in which it contacts the movable pin 25c and positions the movable pin 25c inward in the radial direction of the pin wheel 25, and a non-operating position in which the movable pin 25c is not positioned inward in the radial direction of the pin wheel 25.

[0062] More specifically, the switching unit 42 includes a first arm 42a that switches the state of the pinwheel 25 (engageable state and unengageable state) by contacting the striking unit 5, and a fourth arm 44 that operates in conjunction with the first arm 42a. Furthermore, the switching unit 42 includes a fifth arm 45 that can contact the pinwheel 25, and a second arm 42b that operates in conjunction with the fifth arm 45. Also, as shown in Figure 12, the switching unit 42 has a first link 42h that operates in contact with the striking unit 5, and a second link 42i that operates in contact with the pinwheel 25. The first link 42h and the second link 42i are capable of operating independently of each other.

[0063] The first link 42h includes a first arm 42a that can engage with the movable pin 25c, an engaging portion 42k (see Figure 13) that can engage with the striking portion 5, and a fourth arm 44 that operates in conjunction with the first arm 42a. The first arm 42a is positioned on the front side of the blade guide 28 in the front-rear direction Y1, corresponding to one of the two discs 25b, and the fourth arm 44 is positioned on the rear side of the blade guide 28 in the front-rear direction Y1, corresponding to the other disc 25b. In other words, the first arm 42a is positioned on the front side of the blade guide 28, and the fourth arm 44 is positioned on the rear side of the blade guide 28. The first arm 42a, positioned outside one of the discs 25b, and the fourth arm 44, positioned outside the other disc 25b, are connected by a connecting bar 42f. Furthermore, an engaging portion 42k, which can engage with the striking portion 5, is provided to connect to the connecting bar 42f.

[0064] As a result, the first arm 42a, the fourth arm 44, and the engaging portion 42k are arranged to rotate in conjunction with each other around the rotation axis 47. The engaging portion 42k of the first link 42h can engage with the rib 23b of the driver blade 23 (striking portion 5). The first arm 42a has a contact portion 42d that contacts the movable pin 25c, and the fourth arm 44 has a contact portion 44a (see Figure 16) that contacts the movable pin 25c.

[0065] On the other hand, the second link 42i includes a second arm 42b that can engage with the movable pin 25c, and a fifth arm 45 that operates in conjunction with the second arm 42b and has an engaging portion 45b (see Figure 16) that can engage with a projection 25f on the outer circumference of the disc 25b. The second arm 42b is located inside the first arm 42a and is positioned on the front side of the blade guide 28 in the front-rear direction Y1, corresponding to one of the two discs 25b. On the other hand, the fifth arm 45 is located inside the fourth arm 44 and is positioned on the rear side of the blade guide 28 in the front-rear direction Y1, corresponding to the other disc 25b. In other words, the second arm 42b is positioned on the front side of the blade guide 28, and the fifth arm 45 is positioned on the rear side of the blade guide 28. Furthermore, a second arm 42b positioned on the outside of one disc 25b and a fifth arm 45 positioned on the outside of the other disc 25b are connected by a connecting bar 42g.

[0066] As a result, the second arm 42b and the fifth arm 45 are arranged to rotate in conjunction with each other around the rotation axis 47. The engaging portion 45b of the fifth arm 45 of the second link 42i is capable of engaging with the protruding portion 25f on the outer circumference of the pin wheel 25. The second arm 42b also has a contact portion 42e that abuts against the movable pin 25c, and the fifth arm 45 has a contact portion 45a (see Figure 16) that abuts against the movable pin 25c.

[0067] Furthermore, as shown in Figure 11, the contact portion 42d of the first arm 42a has a protruding portion 42c that extends toward the second arm 42b. The protruding portion 42c is the part of the side of the contact portion 42d of the first arm 42a that protrudes inward (towards the second arm 42b), and is the part that can rest on and support the second arm 42b when the first arm 42a rotates toward the pin wheel 25. In other words, when the first arm 42a rotates toward the pin wheel 25, the second arm 42b is hooked onto and supported by this protruding portion 42c, and the second arm 42b rotates together with the first arm 42a while being supported by it.

[0068] The first arm 42a and the fourth arm 44 are always biased to rotate away from the pinwheel 25 by the torsion spring 48a shown in Figure 12. Similarly, the second arm 42b and the fifth arm 45 are also always biased to rotate away from the pinwheel 25 by the torsion spring 48b.

[0069] Next, the auxiliary switching unit of the driving machine 1 of this second embodiment will be described. The auxiliary switching unit is a member that switches the pin wheel 25 from an in-engagement state, where it cannot engage with the striking unit 5, to an engageable state, where it can engage with the striking unit 5. At that time, the auxiliary switching unit operates by receiving the power generated by the rotation of the pin wheel 25, and moves the switching unit 42, which is in the operating position, to the non-operating position by receiving the power generated by the rotation of the pin wheel 25. At this time, the operating position is a position close to the movable pin 25c located radially inside the pin wheel 25, and the non-operating position is a position away from the movable pin 25c located radially outside the pin wheel 25. In other words, the auxiliary switching unit receives the power generated by the rotation of the pin wheel 25 and moves the switching unit 42, which is in a position close to the movable pin 25c located radially inside the pin wheel 25, to the radially outside of the pin wheel 25.

[0070] For example, when the number of times the driving machine 1 is used increases and dust buildup causes the biasing force on the first arm 42a by the torsion spring 48a (the force that returns the first arm 42a to its original position) to weaken, the auxiliary switching unit works to mechanically return the first arm 42a to its original position.

[0071] To explain in more detail, the driving machine 1 of this second embodiment is provided with a third arm 43 and a sixth arm 46 as auxiliary switching units.

[0072] As shown in Figures 11 to 15, the third arm 43 is positioned inside the second arm 42b on the front side of the blade guide 28 in the front-rear direction Y1. In other words, on the front side of the blade guide 28, the first arm 42a, the second arm 42b, and the third arm 43 are arranged in order from the outside.

[0073] The third arm 43 has an arm body 43a that is rotatably fixed to the blade guide 28, a contact portion 43b provided on the arm body 43a that can contact the pin wheel 25, and a pin 43c provided on the arm body 43a that engages with the first arm 42a. The arm body 43a is rotatable about a rotation axis 43d relative to the blade guide 28. Similarly, the contact portion 43b and the pin 43c provided on the arm body 43a also rotate about the rotation axis 43d in conjunction with the rotation of the arm body 43a.

[0074] Furthermore, the third arm 43 operates by contacting a projection 25j provided on the disc (rotating base) 25b of the pinwheel 25. In detail, projections 25j are provided at equal intervals in the circumferential direction on the outer circumference of the disc 25b of the pinwheel 25. As shown in Figure 11, each of the multiple projections 25j is shaped to protrude from the disc 25b in the front-rear direction Y1, and is located at the ends of the multiple projections 25f that are arranged at equal intervals in the circumferential direction on the outer circumference of the disc 25b. Each of the multiple projections 25j is located at the front end of the multiple projections 25f in the rotation direction R1 of the disc 25b, and is located slightly behind the movable pin 25c located near the outer circumference in the rotation direction R1 of the disc 25b. Furthermore, the spring 25d, which biases each of the multiple movable pins 25c radially outward of the disc 25b, has one end wound around the movable pin 25c and the other end inserted into and fixed in a hole 25k formed along the protruding portion 25f.

[0075] Furthermore, the pin 43c of the third arm 43 protrudes forward (outward) from the arm body 43a in the front-rear direction Y1 and is provided to engage with the elongated hole 42p of the first arm 42a. As a result, as shown in Figure 14, when the arm body 43a of the third arm 43 rotates in the rotation direction R2 about the rotation axis 43d, the pin 43c also rotates in the rotation direction R2 about the rotation axis 43d. When the pin 43c rotates in the rotation direction R2, as shown in Figure 15, the first arm 42a, which is engaged with the pin 43c by the elongated hole 42p, returns to its original position. That is, because the third arm 43 and the first arm 42a are linked via the pin 43c and the elongated hole 42p, the rotational movement of the pin 43c in the elongated hole 42p in the rotation direction R2 causes the first arm 42a, which has the elongated hole 42p, to move to its original position.

[0076] As shown in Figure 14, the third arm 43 rotates in the rotational direction R2 when its contact portion 43b comes into contact with the projection 25j of the pinwheel 25. That is, when the biasing force on the first arm 42a by the torsion spring 48a weakens and the first arm 42a no longer returns to its original position, the contact portion 43b of the third arm 43, which has not returned to its original position (outside the pinwheel 25) along with the first arm 42a, is repelled outwards from the pinwheel 25 by the projection 25j of the pinwheel 25. As a result, the third arm 43 rotates in the rotational direction R2. Consequently, the first arm 42a, which can no longer return to its original position with the biasing force of the torsion spring 48a, moves away from the pinwheel 25 and back to its original position, as shown in Figure 15, linked to the rotational movement of the pin 43c of the third arm 43 in the rotational direction R2. Furthermore, when the first arm 42a moves back to its original position, the fourth arm 44 (see Figure 16), which is linked to the first arm 42a, also moves back to its original position. In other words, the third arm 43 is an auxiliary switching unit that moves (returns) the first arm 42a and the fourth arm 44 to their original positions.

[0077] On the other hand, the sixth arm 46 is positioned inside the fifth arm 45 on the rear side of the blade guide 28 in the front-rear direction Y1. In other words, on the rear side of the blade guide 28, the fourth arm 44, the fifth arm 45, and the sixth arm 46 are positioned in order from the outside.

[0078] The sixth arm 46 has an arm body 46a rotatably fixed to the blade guide 28, a contact portion 46b provided on the arm body 46a that can contact the pin wheel 25, and a pin 46c provided on the arm body 46a that engages with the fifth arm 45. The arm body 46a is rotatable about a rotation axis 46d relative to the blade guide 28. Similarly, the contact portion 46b and the pin 46c provided on the arm body 46a also rotate about the rotation axis 46d in conjunction with the rotation of the arm body 46a.

[0079] Furthermore, the sixth arm 46 operates by contacting a movable pin (movable engaging portion) 25c provided on the pinwheel 25. More specifically, movable pins 25c are provided at equal intervals in the circumferential direction on the outer circumference of the disc 25b of the pinwheel 25. As shown in Figure 11, each of the multiple movable pins 25c has a shape that protrudes from the disc 25b in the front-rear direction Y1, and is located between adjacent protrusions 25f of the multiple protrusions 25f arranged at equal intervals in the circumferential direction on the outer circumference of the disc 25b.

[0080] Furthermore, the pin 46c of the sixth arm 46 protrudes from the arm body 46a toward the rear (outward) in the front-rear direction Y1 (see Figure 12) and is provided to engage with the elongated hole 45c of the fifth arm 45. As a result, as shown in Figure 17, when the arm body 46a of the sixth arm 46 rotates in the rotational direction R3 about the rotation axis 46d, the pin 46c also rotates in the rotational direction R3 about the rotation axis 46d. When the pin 46c rotates in the rotational direction R3, the fifth arm 45, which is engaged with the pin 46c by the elongated hole 45c, returns to its original position, as shown in Figure 18. In other words, because the sixth arm 46 and the fifth arm 45 are linked via the pin 46c and the elongated hole 45c, the rotational movement of the pin 46c in the elongated hole 45c in the rotational direction R3 causes the fifth arm 45, which has the elongated hole 45c, to move to its original position.

[0081] As shown in Figure 17, the sixth arm 46 rotates in the rotational direction R3 when its contact portion 46b comes into contact with the movable pin 25c provided on the pinwheel 25. In other words, when the biasing force on the second arm 42b by the torsion spring 48b weakens and the second arm 42b fails to return to its original position, the fifth arm 45, which is linked to the second arm 42b, also fails to return to its original position (as shown in Figure 17). In this state, the contact portion 46b of the sixth arm 46 is positioned on the outer circumference of the pinwheel 25. At this time, the contact portion 46b of the sixth arm 46 is flicked outward from the pinwheel 25 by the movable pin 25c provided on the pinwheel 25. As a result, the sixth arm 46 rotates in the rotational direction R3. When the sixth arm 46 rotates in the rotational direction R3, the fifth arm 45, which has an elongated hole 45c that engages with the pin 46c of the sixth arm 46, moves away from the pin wheel 25 and back to its original position, as shown in Figure 18, in conjunction with the rotational movement of the pin 46c of the sixth arm 46 in the rotational direction R3. When the fifth arm 45 moves back to its original position, the second arm 42b (see Figure 15), which is linked to the fifth arm 45, also moves back to its original position. In other words, the sixth arm 46 is an auxiliary switching unit that moves the second arm 42b and the fifth arm 45 back to their original positions.

[0082] Next, the operation of the pin wheel 25 and the switching unit 42 will be explained.

[0083] The state shown in Figure 13 is one in which the first arm 42a, indicated by the dotted line, has pushed in the movable pin 25c(B1). That is, the driver blade 23 has risen to, for example, near top dead center, and the engaging portion 42k, which is linked to the first arm 42a, is engaged with the rib 23b of the driver blade 23, so that the movable pin 25c(B1) is pushed inward radially by the first arm 42a. In other words, the contact portion 42d of the first arm 42a is in contact with the movable pin 25c(B1) at E1. The movable pin 25c(B1) is a pin located downstream of the movable pin 25c(A1) in the rotational direction R1 of the pin wheel 25.

[0084] At this time, the protruding portion 42c of the first arm 42a (see Figure 11) causes the second arm 42b to move together with the first arm 42a, so the second arm 42b is also positioned near the movable pin 25c (B1).

[0085] Figure 14 shows the state in which the driver blade 23 has been lowered from this state. In the state shown in Figure 14, the second arm 42b has pushed the movable pin 25c radially inward of the pin wheel 25 by the contact portion 42e. That is, the contact portion 42e of the second arm 42b is in contact F1 with the movable pin 25c (B1). At this time, the first arm 42a should be positioned away from the pin wheel 25 due to the biasing force of the torsion spring 48a, since its engaging portion 42k is not engaged with the rib 23b of the driver blade 23. However, if the biasing force on the first arm 42a by the torsion spring 48a weakens due to the effects of dust or the like, the first arm 42a will not return to its original position, as shown in Figure 14.

[0086] Furthermore, when the first arm 42a does not return to its original position, the third arm 43, which engages with the elongated hole 42p of the first arm 42a and the pin 43c, also does not return to its original position. In this state, when the pin wheel 25 rotates in the rotational direction R1, the projection 25j of the pin wheel 25 comes into contact with the contact portion 43b of the third arm 43. That is, the projection 25j of the pin wheel 25 comes into contact with the contact portion 43b of the third arm 43 at a pressure G1. At this time, the third arm 43 is flicked outward by the projection 25j of the pin wheel 25. As a result, the third arm 43 rotates around the rotation axis 43d in the rotational direction R2. As the third arm 43 rotates in the rotational direction R2, the first arm 42a, which can no longer return to its original position by the biasing force of the torsion spring 48a, moves away from the pin wheel 25 and back to its original position, as shown in Figure 15, linked to the rotational movement of the pin 43c of the third arm 43 in the rotational direction R2. Then, as the first arm 42a moves back to its original position, the fourth arm 44 (see Figure 12), which is linked to the first arm 42a, also moves back to its original position. At this time, the second arm 42b is in a state where its contact portion 42e is in contact with the movable pin 25c (B1) at a pressure of H1. That is, the second arm 42b maintains a state in which the movable pin 25c (B1) is pushed radially inward by the contact portion 42e.

[0087] Next, the state shown in Figure 16 shows the fourth arm 44, indicated by the dotted line, pushing in the movable pin 25c(B1). That is, the driver blade 23 has risen to, for example, near top dead center, and the engaging portion 42k, which is linked to the fourth arm 44, is engaged with the rib 23b of the driver blade 23. As a result, the movable pin 25c(B1) is pushed radially inward into the pin wheel 25 by the fourth arm 44, which is linked to the first arm 42a. In other words, the contact portion 44a of the fourth arm 44 is in contact J1 with the movable pin 25c(B1).

[0088] At this time, the engaging portion 45b of the fifth arm 45 engages with the protruding portion 25f on the outer circumference of the pin wheel 25. That is, the engaging portion 45b of the fifth arm 45 is in contact K1 with the protruding portion 25f of the pin wheel 25. As a result, the fifth arm 45 is positioned in the vicinity of the movable pin 25c(B1).

[0089] Figure 17 shows the state after the driver blade 23 has been lowered from this state. In the state shown in Figure 17, the fourth arm 44 has returned to its original position, separated from the pin wheel 25. At this time, the biasing force of the torsion spring 48b should normally cause the fifth arm 45, along with the second arm 42b, to be positioned in a direction away from the pin wheel 25. However, if the biasing force of the torsion spring 48b on the second arm 42b weakens due to the effects of dust or other factors, the fifth arm 45 will not return to its original position, as shown in Figure 17.

[0090] In this state, when the pinwheel 25 rotates in the rotational direction R1, the movable pin 25c(C1) of the pinwheel 25 comes into contact with the contact portion 46b of the sixth arm 46. That is, the movable pin 25c(C1) of the pinwheel 25 comes into contact with the contact portion 46b of the sixth arm 46 at a distance L1. At this time, the sixth arm 46 is flicked outward from the pinwheel 25 by the movable pin 25c(C1) of the pinwheel 25. As a result, the sixth arm 46 rotates about the axis of rotation 46d in the rotational direction R3. Due to the rotation of the sixth arm 46 in the rotational direction R3, the fifth arm 45, which can no longer return to its original position by the biasing force of the torsion spring 48b, moves away from the pinwheel 25 and back to its original position, as shown in Figure 18, linked to the rotational movement of the pin 46c of the sixth arm 46 in the rotational direction R3. Then, as the fifth arm 45 moves (returns) to its original position, the second arm 42b (see Figure 15), which is linked to the fifth arm 45, also moves (returns) to its original position.

[0091] As described above, in the driving machine 1 of this embodiment 2, even when the biasing force of the torsion springs 48a and 48b weakens due to dust clogging or other reasons, the switching parts 42, such as the first arm 42a, second arm 42b, fourth arm 44, or fifth arm 45, which have the movable pin 25c pushed inward, can be moved (returned) to their original positions. In other words, by providing auxiliary switching parts such as the third arm 43 and the sixth arm 46, the switching parts 42, which have the movable pin 25c pushed inward, can be moved (returned) to their original positions using the power of the pin wheel 25.

[0092] This prevents collision between the movable pin 25c of the pin wheel 25 and the arm of the switching unit 42. As a result, damage to the movable pin 25c and the switching unit 42 can be suppressed, improving the convenience of the driving machine 1.

[0093] In the second embodiment, the third arm 43 moves the first arm 42a and the fourth arm 44 from the operating position to the non-operating position, and the sixth arm 46 moves the second arm 42b and the fifth arm 45 from the operating position to the non-operating position, so the torsion springs 48a and 48b may be omitted.

[0094] Alternatively, the second arm 42b and the fifth arm 45 may be removed, and when the third arm 43 moves the first arm 42a and the fourth arm 44 from the operating position to the non-operating position, the movable pin 25c immediately moves radially outward, and the pin wheel 25 switches from a non-engagement state to an engageable state. In this case, the third arm 43, which is an auxiliary switching unit, can be considered as receiving the power from the rotation of the pin wheel 25 and switching the pin wheel 25 from a non-engagement state to an engageable state.

[0095] (Embodiment 3) Next, Embodiment 3 will be described.

[0096] In this third embodiment, as shown in Figure 19, the pinwheel 25 is provided with only one movable pin 25c, and all other pins are fixed pins 25i. The movable pin 25c is the first pin that contacts the rack 23a of the driver blade 23, and is biased by a spring 25g attached to the rotating shaft 25a to always be positioned outside the groove 25h. The groove 25h is an elongated hole formed from the center side of the pinwheel 25 toward the outer circumference (outside).

[0097] Furthermore, an arm 32p is provided as a switching unit 32 (maintenance mechanism 36) that switches the state of the pinwheel 25 between an engageable state in which it can engage with the driver blade 23 and an unengageable state in which it cannot engage with the driver blade 23. The arm 32p has a first engaging portion 32q that can press the movable pin 25c and a second engaging portion 32r that can engage with a protrusion 25f provided on the outer circumference of the pinwheel 25. The arm 32p is also rotatable about a rotation axis 33 and is biased by a torsion spring 35c to always rotate in a direction away from the pinwheel 25.

[0098] Next, the operation of the pin wheel 25, driver blade 23, and switching unit 32 in this third embodiment will be described.

[0099] First, in the [standby position] shown in Figure 19, the driver blade 23 is raised to near top dead center, and the movable pin 25c of the pinwheel 25 and the rack 23a of the driver blade 23 are not engaged. At this time, the arm 32p is positioned away from the pinwheel 25 due to the biasing force of the torsion spring 35c, because its second engaging portion 32r is not engaged with the protruding portion 25f of the pinwheel 25.

[0100] Next, as the pinwheel 25 continues to rotate in the rotational direction R1, the fixing pin 25i of the pinwheel 25 engages with the rack 23a of the driver blade 23, pushing the driver blade 23 upward toward top dead center.

[0101] Subsequently, the second engaging portion 32r of the arm 32p comes into contact with the protrusion 25f of the pinwheel 25. While the second engaging portion 32r remains in contact with the protrusion 25f of the pinwheel 25, the driver blade 23 is pushed upward U1 to reach the top dead center shown in Figure 20. When the driver blade 23 reaches the top dead center, the engagement with the pinwheel 25 is released, and the driver blade 23 is released. Immediately after the driver blade 23 is released, the first engaging portion 32q of the arm 32p comes into contact with the movable pin 25c, as shown in Figure 21. The second engaging portion 32r of the arm 32p remains in contact with the protrusion 25f of the pinwheel 25. Therefore, the arm 32p is supported at three points by the rotation axis 33, the first engaging portion 32q, and the second engaging portion 32r. In this state, the driver blade 23 reaches the bottom dead center, as shown in Figure 21.

[0102] Even when the driver blade 23 reaches the bottom dead center, the second engaging portion 32r of the arm 32p remains in contact with the protruding portion 25f of the pin wheel 25, and the first engaging portion 32q remains in contact with the movable pin 25c. As a result, the arm 32p is supported at three points by the rotation axis 33, the first engaging portion 32q, and the second engaging portion 32r. In other words, the pin wheel 25 is in a non-engagement state, unable to engage with the driver blade 23.

[0103] Next, the driver blade 23 bounces upward in the direction U1 by [bouncing (rising)] as shown in Figure 22. That is, after the driver blade 23 reaches the bottom dead center, it collides with the damper 24 (see Figure 2), then bounces back and moves upward in the direction U1. The pinwheel 25 continues to rotate in the rotation direction R1. At this time, the arm 32p presses the movable pin 25c toward the center of the disc 25b because its second engaging portion 32r is engaged with the protruding portion 25f of the pinwheel 25. In other words, the movable pin 25c is positioned radially inward of the disc 25b. Furthermore, the state in which the pinwheel 25 cannot engage with the driver blade 23 is maintained. As a result, even if the driver blade 23 moves upward in the direction U1, collision between the driver blade 23 and the movable pin 25c of the pinwheel 25 can be avoided. Furthermore, when the rotation angle of the pinwheel 25 in the rotation direction R1 (see Figure 21) is the rotation angle shown in Figure 22, if the arm 32p is not pressing the movable pin 25c toward the center of the disc 25b, and the movable pin 25c is not positioned radially inward of the disc 25b, then the pinwheel 25 will be able to rotate. In other words, the switching unit 32 (arm 32p) can switch the state of the pinwheel 25 at any angle between a rotatable state and a non-rotatable state.

[0104] The driver blade 23 bounces several times at high speed. That is, after rising, it descends in the downward direction D1 by bouncing (descending), as shown in Figure 23. At this time, as described above, the arm 32p maintains a state in which the first engaging portion 32q presses the movable pin 25c toward the center of the disc 25b, as its second engaging portion 32r is still engaged with the projection 25f of the pinwheel 25, and the state in which the pinwheel 25 cannot engage with the driver blade 23 is also maintained. As a result, even if the driver blade 23 bounces and moves in the downward direction D1, a collision between the driver blade 23 and the movable pin 25c of the pinwheel 25 can be avoided.

[0105] In other words, even when the driver blade 23 is bouncing up and down, the arm 32p maintains a state in which the movable pin 25c is pressed toward the center of the disc 25b by its second engaging portion 32r engaging with the protruding portion 25f of the pin wheel 25. As a result, the state in which the pin wheel 25 cannot engage with the driver blade 23 is maintained, and as a result, even if the driver blade 23 bounces up and down, collision between the driver blade 23 and the movable pin 25c of the pin wheel 25 can be avoided.

[0106] Subsequently, the up-and-down movement (bouncing) of the driver blade 23 stops, and as shown in Figure 24, the pinwheel 25 performs a [re-lift-up]. At this time, the arm 32p returns to its standby position because the engagement of its second engaging portion 32r with the protruding portion 25f of the pinwheel 25 is released. That is, the movable pin 25c of the pinwheel 25 is not engaged with the driver blade 23. In this state, the next fixed pin 25i of the pinwheel 25 re-engages with the rack 23a of the driver blade 23, and the driver blade 23 begins to be pushed up.

[0107] In this third embodiment, even when the driver blade 23 is bouncing, and the pinwheel 25 rotates to a position where it can engage with the rack 23a of the driver blade 23, the movable pin 25c is pressed by the switching unit 32 (arm 32p), causing the movable pin 25c to be positioned radially inward. This prevents collision between the rack 23a of the driver blade 23 and the pinwheel 25. As a result, damage to the rack 23a of the driver blade 23 and the pinwheel 25 can be suppressed, improving the usability of the driving machine 1.

[0108] Thus, even if only the movable pin 25c (first pin) of the pin wheel 25 is movable, while the driver blade 23 is bouncing, the movable pin 25c does not immediately return to its original position but is pressed by the switching unit 32 (arm 32p) and positioned radially inward. This makes it possible to avoid collision between the rack 23a of the driver blade 23 and the pin wheel 25, thereby improving the convenience of the driving machine 1.

[0109] Next, a modified example of this third embodiment will be described. The modified example of this third embodiment shows a method for returning the arm 32p to its original position when the biasing force on the arm 32p by the torsion spring 35c (the force that returns the arm 32p to its original position) weakens due to dust clogging or other reasons.

[0110] Specifically, Figure 25 shows the driver blade 23 descending in the downward direction D1. At this time, the first engaging portion 32q of the arm 32p contacts the movable pin 25c, pushing the movable pin 25c inward into the pin wheel 25. In this state, if the arm 32p fails to return to its original position, as shown in Figure 26, the fixed pin 25i downstream of the movable pin 25c in the rotation direction R1 of the pin wheel 25 comes into contact with the first engaging portion 32q of the arm 32p (contact M1).

[0111] At this time, the arm 32p, which has been flicked by the fixing pin 25i, rotates in a direction away from the pin wheel 25, as shown in Figure 27, and the first engaging portion 32q of the arm 32p stops at a position away from the pin wheel 25.

[0112] As described above, even if the biasing force on the arm 32p by the torsion spring 35c weakens and the arm 32p fails to return to its original position, the arm 32p can be moved (returned) to its original position by bringing it into contact with the fixing pin 25i of the pin wheel 25.

[0113] This prevents collision between the movable pin 25c of the pin wheel 25 and the arm 32p. As a result, damage to the switching part 32 (see Figure 19), such as the movable pin 25c and the arm 32p, can be suppressed, improving the convenience of the driving machine 1.

[0114] The present invention is not limited to the embodiments 1, 2, and 3 described above, and can be modified in various ways without departing from its essence. In embodiment 1 shown in Figure 1, all pins of the pinwheel 25 are movable, and in embodiment 3 shown in Figure 19, only the first pin is movable, and all other pins are fixed pins 25i. However, the number and arrangement of movable pins can be set as appropriate. For example, if two pins are made movable and the other pins are fixed pins, collisions between the rack 23a and the pinwheel 25 can be avoided over a wider time than in embodiment 3. [Explanation of Symbols]

[0115] 1...Driver, 2...Cylinder case, 3...Nail (fastener), 4...Motor case, 5...Striking section, 6...Handle, 8...Connecting section, 10...Housing, 12...Magazine, 13...Motor, 14...Drive shaft, 15...Reduction mechanism, 16...Battery, 17...Controller, 20...Cylinder, 21...Piston, 22...Upper piston chamber, 23...Driver blade, 23a...Rack, 23b...Rib, 24...Damper, 25...Pinwheel (rotating part), 25a...Rotating shaft, 25b...Disc (rotating base), 25c...Movable pin (movable part) Joint part), 25d...spring, 25e...support part, 25f...protruding part, 25g...spring, 25h...groove, 25i...fixing pin, 25j...projection part, 25k...hole part, 26...pressure accumulation chamber (biasing part), 26a...chamber, 28...blade guide, 29...push lever, 31...injection path, 32...switching part, 32a...first arm, 32b...second arm, 32c...protruding part, 32d,32e...contact part, 32f,32g...connecting bar, 32h...first link, 32i...second link, 32j,32k...engaging part, 32p... Arm, 32q...First engaging part, 32r...Second engaging part, 33...Rotation shaft, 34...Injection part, 35a,35b,35c...Torsion spring, 36...Maintaining mechanism, 42...Switching part, 42a...First arm, 42b...Second arm, 42c...Protruding part, 42d,42e...Contact part, 42f,42g...Connecting bar, 42h...First link, 42i...Second link, 42k...Engaging part, 42p...Slotted hole, 43...Third arm (auxiliary switching part), 43a...Arm body, 43b...Contact part, 43c...Pin, 43d...Rotation shaft, 4 4...4th arm, 44a...contact part, 45...5th arm, 45a...contact part, 45b...engaging part, 45c...elongated hole, 46...6th arm (auxiliary switching part), 46a...arm body, 46b...contact part, 46c...pin, 46d...rotating shaft, 47...rotating shaft, 48a,48b...torsion spring, 100...matting material, D1...downward direction, R1,R2,R3...rotation direction, U1...upward direction, X1...up / down direction (first direction), Y1...front / back direction, Z1...left / right direction, E1,F1,G1,H1,J1,K1,L1,M1...contact

Claims

1. Injection section and A striking part that moves to one side in the first direction to strike the stopper supported by the injection part, A biasing unit that biases the striking unit toward one side in the first direction, A rotating part is provided, which rotates while engaged with the striking part, thereby moving the striking part to the other side of the first direction against the biasing force of the biasing part, and disengaging from the striking part, thereby moving the striking part to one side of the first direction by the biasing force of the biasing part. The rotating part can be in multiple states, including an engageable state in which it can engage with the striking part, and an unengageable state in which it cannot engage with the striking part. A work machine having a switching unit that contacts the rotating unit to set the state of the rotating unit according to the rotational position of the rotating unit.

2. The work machine according to claim 1, wherein the switching unit maintains the rotating unit in the disengaged state for a predetermined time even after the engagement of the rotating unit with the striking unit is released and the striking unit moves to one side in the first direction.

3. The rotating part is, A rotating base that rotates around the axis of rotation, It has a movable engaging portion that is attached to the rotating base so as to be able to move relative to it in the radial direction about the rotation axis, and which does not engage with the striking portion when positioned in the inner position in the radial direction, and engages with the striking portion when positioned in the outer position in the radial direction, The movable engaging portion is positioned to be able to engage with the striking portion when the angle of the rotating base around the rotation axis is within a first angular range, and is positioned not to be able to engage with the striking portion when the angle of the rotating base is within a second angular range. The work machine according to claim 1, wherein the switching unit, when the rotating base is in the first angular range, contacts the movable engaging portion and positions the movable engaging portion radially inward, thereby disengaging the rotating portion.

4. The rotating base has a projection that protrudes outward in the radial direction and contacts the switching portion, Multiple movable engagement parts are provided, The work machine according to claim 3, wherein the number of protrusions is the same as the number of movable engaging portions.

5. The work machine according to claim 1, wherein the switching unit operates by contacting the striking unit, thereby switching the state of the rotating unit.

6. The work machine according to claim 5, wherein the switching part comes into contact with the striking part and then with the rotating part during the process in which the striking part moves to the other side in the first direction.

7. The switching unit has a first link that operates in contact with the striking unit and a second link that operates in contact with the rotating unit. The work machine according to claim 5, wherein the first link and the second link are capable of operating independently of each other.

8. The switching unit is movable between an operating position in which it contacts the movable engaging portion and positions the movable engaging portion in the inner position, and a non-operating position in which the movable engaging portion is not positioned in the inner position. The work machine according to claim 3, further comprising an auxiliary switching unit that receives power from the rotating unit to move the switching unit, which is in the operating position, to the non-operating position.

9. The work machine according to claim 8, wherein the auxiliary switching unit operates in contact with the rotating base.

10. The work machine according to claim 9, wherein the auxiliary switching unit operates in contact with the movable engaging unit.

11. Injection section and A striking part that moves to one side in the first direction to strike the stopper supported by the injection part, A biasing unit that biases the striking unit toward one side in the first direction, A rotating part is provided, which rotates while engaged with the striking part, thereby moving the striking part to the other side of the first direction against the biasing force of the biasing part, and when the engagement with the striking part is released, moves the striking part to one side of the first direction by the biasing force of the biasing part, causing it to reach the bottom dead center. The rotating part can be in multiple states, including an engageable state in which it can engage with the striking part, and an unengageable state in which it cannot engage with the striking part. A work machine having a maintenance mechanism that maintains the rotating part in the disengaged state for a predetermined time after the engagement of the rotating part with the striking part is released and the striking part moves to the bottom dead center.

12. Injection section and A striking part that moves to one side in the first direction to strike the stopper supported by the injection part, A biasing unit that biases the striking unit toward one side in the first direction, A rotating part is provided, which rotates while engaged with the striking part, thereby moving the striking part to the other side of the first direction against the biasing force of the biasing part, and disengaging from the striking part, thereby moving the striking part to one side of the first direction by the biasing force of the biasing part. The rotating part is, A rotating base that rotates around the axis of rotation, A movable engaging portion is attached to the rotating base so as to be able to move relative to it in the radial direction about the rotation axis, and when positioned in the inner position in the radial direction, it does not engage with the striking portion, and when positioned in the outer position in the radial direction, it engages with the striking portion. It has a switching unit for setting the position of the movable engagement part, The switching unit is movable between an operating position in which it contacts the movable engaging portion and positions the movable engaging portion in the inner position, and a non-operating position in which the movable engaging portion is not positioned in the inner position. A work machine having an auxiliary switching unit that moves the switching unit, which is in the operating position, to the non-operating position by receiving power from the rotating unit.

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