Work machine

Abstract

To provide a work machine with improved convenience.SOLUTION: A nail driver 10 has: an injection part 42; a plunger 52; a coil spring 58; a bottom holder 62; a top holder 64; a connection part; a bottom damper 74; and a take-out part 61. The plunger 52 strikes a nail. The coil spring 58 energizes the plunger 52 to a lower side. The bottom holder 62 regulates movement of the plunger 52 to a lower side than a first regulation position P1. The top holder 64 regulates extension of the coil spring 58 to an upper side than a second regulation position P2. The connection part connects the bottom holder 62 and the top holder 64. The bottom damper 74 absorbs the kinetic energy of the plunger 52 toward the bottom holder 62. The take-out part 61 can take out at least one of the coil spring 58 and the bottom damper 74 from between the bottom holder 62 and the trop holder 64 in the state that the connection part maintains such connection.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In the working machine described in Patent Document 1, two guide bars are fixed to a top holder and a bottom holder. Between the top holder and the bottom holder, a bumper, a spring, a plunger, and a counterweight are provided.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the working machine of Patent Document 1, since the bumper deteriorates more easily than other members, it is necessary to replace it frequently. When replacing the bumper, disassembly work for removing the top holder and the bottom holder from the two guide bars is required. In this case, however, the spring, the plunger, and the counterweight also come off. Therefore, it is necessary to reassemble these members again, and since the man-hours required for bumper replacement increase, there is room for improvement in the workability of bumper replacement.

[0005] An object of the present invention is to provide a working machine with improved convenience.

Means for Solving the Problems

[0006] A working machine according to one embodiment includes an injection part, a striking part, a biasing part, a first-side restricting part, a second-side restricting part, a connecting part, a buffer part, and a taking-out part. The injection part supports a stopper. The striking part strikes the stopper supported by the injection part by moving to one side in a first direction. The biasing part biases the striking part to one side in the first direction by extending to one side in the first direction. The first-side restricting part is located between the injection part and the striking part and restricts the striking part from moving to one side beyond a first-side restricting position in the first direction. The second-side restricting part is located on the other side of the first direction relative to the biasing part and restricts the biasing part from extending to the other side beyond a second-side restricting position in the first direction. The connecting part connects the first-side restricting part and the second-side restricting part. The buffer part is located between the first-side restricting part and the striking part and absorbs the kinetic energy of the striking part moving toward the first-side restricting part. The taking-out part enables at least one of the biasing part and the buffer part to be taken out from between the first-side restricting part and the second-side restricting part while the connecting part maintains the connection between the first-side restricting part and the second-side restricting part.

Advantages of the Invention

[0007] According to the present invention, the convenience of the working machine can be improved.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Mode for Carrying Out the Invention

[0009] Hereinafter, an example of an embodiment will be described with reference to the drawings. In all the drawings referred to for explaining the embodiment, the same or substantially the same components and elements are denoted by the same reference numerals. Also, components and elements once described will not be repeatedly described in principle. For some of the drawings, there are portions where the hatching display of the cross section is omitted in order to clearly show the arrangement and configuration of the members.

[0010] 〔First Embodiment〕 <Outline of the Working Machine> The working machine according to the present embodiment is a nail driver suitably used for the driving operation of a nail N (Fig. 5), which is an example of a stopper.

[0011] Fig. 1 shows a nail driver 10 of the first embodiment. The nail driver 10 drives a nail N (Fig. 5) into a mating material G such as wood or a gypsum board. The nail driver 10 includes a housing 12, a magazine 21, and a battery 24.

[0012] <<Definition of Directions>> In the nail driver 10 shown in Fig. 2, the direction in which a plunger 52, which will be described later, moves is defined as the vertical direction. The vertical direction is an example of the first direction. The lower side is the side where an injection part 42, which will be described later, is located, and is an example of one side of the first direction. The upper side is an example of the other side of the first direction. The direction orthogonal to the vertical direction is defined as the front-rear direction and the left-right direction. The front-rear direction is the direction in which the magazine 21 that houses a plurality of nails N (Fig. 5) extends. The left-right direction is the direction orthogonal to both the vertical direction and the front-rear direction. Note that such a definition is only for convenience of explanation.

[0013] <<Housing>> As shown in Fig. 3, the housing 12 can be divided into two parts. The housing 12 has a left housing 13 and a right housing 14. The left housing 13 and the right housing 14 are integrated by fastening screws (not shown) to form the housing 12.

[0014] Further, the housing 12 is divided into a left housing 13 and a right housing 14 by releasing the fastening of a screw (not shown). By dividing the left housing 13 and the right housing 14, the striking unit 50 described later can be attached to and detached from the housing 12. In this embodiment, as an example, the striking unit 50 is detachably provided on the left housing 13.

[0015] As shown in FIG. 2, the housing 12 has a cylindrical portion 15, a motor housing portion 16, a grip portion 18, and a mounting portion 22.

[0016] The cylindrical portion 15 is formed in a cylindrical shape extending in the vertical direction. The striking unit 50 described later is housed in the cylindrical portion 15. Further, the striking unit 50 has each member such as a bottom holder 62 described later. In other words, the bottom holder 62 is detachable from the housing 12. Further, a gear portion 32 (FIG. 5) described later is attached to the cylindrical portion 15.

[0017] The motor housing portion 16 is formed in a cylindrical shape extending rearward from the cylindrical portion 15. A motor 26 described later is housed inside the motor housing portion 16.

[0018] The grip portion 18 is gripped by an operator. The grip portion 18 is formed in a cylindrical shape extending rearward from the cylindrical portion 15. A trigger lever 19 is operably provided on the grip portion 18.

[0019] The mounting portion 22 connects the rear end portion of the motor housing portion 16 and the rear end portion of the grip portion 18 in the vertical direction. A battery 24 is mounted on the mounting portion 22. A control unit 20 is provided inside the mounting portion 22. When the battery 24 is mounted on the mounting portion 22, power can be supplied from the battery 24 to each part of the nail driver 10 by the contact between the terminals of the battery 24 and the terminals of the mounting portion 22.

[0020] As shown in FIG. 4, a slit ST that is opened and closed by attaching and detaching a lid member (not shown) is provided at the front end of the housing 12. The slit ST extends in the vertical direction. A pin 57 of a plunger 52, which will be described later, is exposed forward from the slit ST. The upper end of a driver blade 86 (FIG. 5) is attached to the pin 57.

[0021] <<Trigger lever>> As shown in FIG. 2, the trigger lever 19 is operated by an operator to actuate and switch the trigger switch TS on and off. Specifically, the trigger lever 19 moves upward when pulled by the finger of an operator who grips the grip portion 18. At this time, the trigger switch TS is turned on. Further, a spring (not shown) is provided on the trigger lever 19. The trigger lever 19 moves downward by the biasing force of this spring. At this time, the trigger switch TS is turned off.

[0022] <<Control unit>> The control unit 20 includes a CPU (Central Processing Unit), a memory unit, a storage, and a timer, and functions as a computer. The control unit 20 can control not only the motor 26 but also the operations of each part of the nail driver 10.

[0023] <<Magazine>> The magazine 21 shown in FIG. 1 is loaded with a plurality of nails N (FIG. 5). The plurality of nails N are arranged in the front-rear direction. The plurality of nails N loaded in the magazine 21 are supplied one by one to the ejection unit 42 by the operation of a feeder unit 23 (FIG. 2) that is movable in the front-rear direction. The supplied nail N is supported by the ejection unit 42 so as to be ejectable.

[0024] <<Battery>> The battery 24 can be connected (attached) to and detached from the attachment portion 22. When the battery 24 is attached to the attachment portion 22, it can supply power to each part of the nail driver 10.

[0025] <<Motor>> As shown in FIG. 2, the motor 26 is housed in the motor housing portion 16 together with the gearbox 28. The motor 26 has a motor shaft, a rotor, and a stator (not shown). When power is supplied from the battery 24, the rotor of the motor 26 rotates, and the motor shaft attached to the rotor rotates. The motor 26 is, for example, a brushed motor.

[0026] <<Gearbox>> The gearbox 28 has an input element, a planetary gear mechanism, and an output element (not shown). The input element is connected to the motor shaft of the motor 26 and rotates integrally with the motor shaft. The output element is connected to the rotating shaft of the first gear 34 (FIG. 5) described later and rotates integrally. When the driving force due to the rotation of the motor shaft is transmitted to the input element of the gearbox 28, deceleration is performed by the planetary gear mechanism and transmitted to the output element. That is, the driving force due to the rotation of the motor 26 is transmitted to the first gear 34 described later.

[0027] <<Gear portion>> As shown in FIG. 5, the gear portion 32 includes a first gear 34, a second gear 36, and a third gear 38. The first gear 34, the second gear 36, and the third gear 38 are supported by the housing 12 so as to be rotatable about the central axis along the left - right direction. The first gear 34, the second gear 36, and the third gear 38 are arranged in this order from the lower side to the upper side. The first gear 34 meshes with the second gear 36. The second gear 36 meshes with the third gear 38. Note that cam rollers 35, 37A, 37B, 39A, 39B (described later) are provided on the front surfaces of the first gear 34, the second gear 36, and the third gear 38.

[0028] The driving force output from the motor 26 (FIG. 2) is input to the gear portion 32 via the gearbox 28 (FIG. 2). More specifically, the driving force output from the motor 26 is input to the first gear 34 via the planetary gear type reduction mechanism housed in the gearbox 28.

[0029] <<Cam roller>> On the front surfaces of the first gear 34, the second gear 36, and the third gear 38, cam rollers are respectively provided. More specifically, a cam roller 35 is provided on the front surface of the first gear 34. On the front surface of the second gear 36, cam rollers 37A and 37B are provided. On the front surface of the third gear 38, cam rollers 39A and 39B are provided.

[0030] When the plunger 52 described later is in the standby position, the cam roller 37B is engaged with the arm 54 of the plunger 52 from below. Also, when the counterweight 82 described later is in the standby position, the cam roller 39B of the third gear 38 is engaged with the arm portion 89 of the counterweight 82.

[0031] [Configuration of Injection Unit and Impact Unit] As shown in FIG. 2, in addition to the above-described configuration, the nail driver 10 has an injection unit 42 and an impact unit 50.

[0032] [Injection Unit] The injection unit 42 is located below the cylinder portion 15. The injection unit 42 extends downward along the vertical direction from the lower end portion of the cylinder portion 15. An injection passage 46 is provided in the injection unit 42 by attaching a guide plate 43. The lower end of the injection passage 46 is open. The feeder unit 23 supplies the nails N (FIG. 5) one by one from the magazine 21 (FIG. 1) to the injection unit 42. The injection unit 42 supports the nail N before being struck. In the injection unit 42, the nail N receives the impact force from the plunger 52, and thus the nail N is injected toward the mating member G.

[0033] Also, a push lever 44 is provided at the lower part of the injection unit 42. The push lever 44 is held by the injection unit 42 so as to be movable in the vertical direction. Further, the push lever 44 is biased downward by a spring (not shown). When the push lever 44 is pressed against the mating member G, it moves upward against the biasing force of the spring and contacts a switch (not shown). At this time, a predetermined signal is output to the control unit 20.

[0034] <Striking Unit> As shown in FIG. 6, the striking unit 50 includes a plunger 52, a coil spring 58, a bottom holder 62, a top holder 64, a connecting portion 65, a bottom damper 74, a take-out portion 61 (FIG. 4), and a shaft 78. Further, the striking unit 50 includes a counterweight 82, a top damper 84, and a driver blade 86.

[0035] The striking unit 50 is detachably provided with respect to the housing 12 (FIG. 2). When replacing the bottom damper 74, after the striking unit 50 is removed from the housing 12, the bottom damper 74 is removed from the striking unit 50. As will be described later, when the bottom damper 74 is removed from the striking unit 50, the striking unit 50 is not disassembled (the connected state is maintained).

[0036] FIG. 7 shows the structure of the striking unit 50. The illustration of the coil spring 58 (FIG. 6) is omitted. The plunger 52 is located on the lower side. The counterweight 82 is located above the plunger 52.

[0037] <<Plunger>> As shown in FIG. 8, the plunger 52 includes a base portion 53, an arm 54, an arm 55, an arm 56, and a pin 57. The base portion 53 is formed in a plate shape having a predetermined thickness in the vertical direction. The arms 54, 55, and 56 project rearward from the base portion 53. The pin 57 projects forward from the base portion 53. The pin 57 is inserted into a through hole 87 (FIG. 6) at the upper end of the driver blade 86 (FIG. 6).

[0038] The plunger 52 and the driver blade 86 are integrally movable in the vertical direction. The plunger 52 strikes the nail N (FIG. 5) supported by the injection unit 42 (FIG. 2) by moving downward in the vertical direction. The plunger 52 is an example of a striking portion.

[0039] <<Coil Spring>> As shown in FIG. 6, the coil spring 58 is formed of a wire wound in a spiral shape. The lower end of the coil spring 58 abuts against the base 53 (FIG. 8) of the plunger 52. The upper end of the coil spring 58 abuts against the counterweight 82. The coil spring 58 biases the plunger 52 downward in the vertical direction by extending downward in the vertical direction. The coil spring 58 is an example of a biasing portion.

[0040] <<Bottom Holder>> As shown in FIG. 9, the bottom holder 62 is located between the injection part 42 and the plunger 52. In FIGS. 2 and 9, in order to clearly show the members, the hatching of some members including the bottom holder 62 is omitted.

[0041] As shown in FIG. 10, a recessed portion 63 that opens upward is provided at the center in the front-rear direction and the center in the left-right direction of the bottom holder 62. The recessed portion 63 has a circular bottom surface. The lower end portion of a shaft 78 described later is inserted into the recessed portion 63. The recessed portion 63 is an example of one-side insertion portion. In the recessed portion 63, the shaft 78 is inserted so as to be movable upward.

[0042] The bottom holder 62 restricts the plunger 52 from moving downward in the vertical direction beyond a predetermined position. The bottom holder 62 is an example of one-side restricting portion. Note that the predetermined position of the plunger 52 is the position of the upper end of the bottom holder 62. In the present embodiment, the predetermined position of the plunger 52 is defined as a first restricting position P1. The bottom holder 62 restricts the plunger 52 from moving downward (toward the injection part 42 side) beyond the first restricting position P1 in the vertical direction. The first restricting position P1 is an example of one-side restricting position.

[0043] <<Top Holder>> The top holder 64 is located above the coil spring 58. The top holder 64 restricts the coil spring 58 from extending upward beyond a predetermined position in the vertical direction. The top holder 64 is an example of the other-side restricting portion. Note that the predetermined position of the coil spring 58 is a position that is lowered by an amount corresponding to the thickness of the upper part of the counterweight 82 from the lower surface of the top holder 64 downward.

[0044] In the present embodiment, the predetermined position of the coil spring 58 is defined as the second restricting position P2. The second restricting position P2 is an example of the other-side restricting position. A through hole 64A penetrating the top holder 64 in the vertical direction is formed in the top holder 64. A shaft 78 is inserted into the through hole 64A so as to be movable in the vertical direction.

[0045] <<Connecting portion>> As shown in FIG. 6, the connecting portion 65 connects the bottom holder 62 and the top holder 64. Specifically, the connecting portion 65 includes a guide portion 66 and an open portion 72.

[0046] <<<Guide portion>>> The guide portion 66 includes, as an example, a right guide rail 67 and a left guide rail 68. The guide portion 66 guides the vertical movement of the plunger 52 and the counterweight 82, and restricts the movement of the plunger 52 in the intersecting direction that intersects the vertical direction. In the present embodiment, regarding the intersecting direction, the circumferential direction of the shaft 78 (the rotational direction centered on the shaft 78) is also included.

[0047] The right guide rail 67 and the left guide rail 68 are each rail members extending along the vertical direction, and connect the bottom holder 62 and the top holder 64 by a plurality of bolts 69. Specifically, the right guide rail 67 connects the right end portion of the bottom holder 62 and the right end portion of the top holder 64. The left guide rail 68 connects the left end portion of the bottom holder 62 and the left end portion of the top holder 64.

[0048] As shown in FIG. 5, the left guide rail 68 is provided with a support shaft 29 and a latch 31 that is rotatable around the support shaft 29. As the counterweight 82 (to be described later) moves, the engagement state and the non-engagement state of the latch 31 with the engagement pin 83 of the counterweight 82 are switched.

[0049] As shown in FIG. 11, the right guide rail 67 and the left guide rail 68 each have a U-shaped cross section when viewed from the vertical direction. Also, the right guide rail 67 and the left guide rail 68 are positioned such that their opening portions face each other in the left-right direction.

[0050] <<<Release portion>>> The release portion 72 shown in FIG. 12 is a portion where at least one of the coil spring 58 and the bottom damper 74 can pass in the front-rear direction, which is an example of the crossing direction, when the shaft 78 moves upward without disassembling the striking unit 50.

[0051] As shown in FIG. 6, the release portion 72 corresponds to the opening portion between the right guide rail 67 and the left guide rail 68. The specific state in which the bottom damper 74 passes through the release portion 72 will be described later. In the present embodiment, the release portion 72 is included in the take-out portion 61.

[0052] <<<Spacer>>> As shown in FIG. 13, when removing the bottom damper 74, a spacer 71 is inserted, for example, between the bottom holder 62 and the plunger 52. The spacer 71 is inserted while resisting the biasing force of the coil spring 58, thereby widening the vertical interval between the bottom holder 62 and the plunger 52. Thereby, the biasing force of the coil spring 58 being applied to the bottom damper 74 via the plunger 52 is suppressed. Note that the spacer 71 is positioned on the side opposite to the front side (the side from which the bottom damper 74 is removed (pulled out)) with respect to the bottom damper 74. That is, the spacer 71 does not restrict the movement of the bottom damper 74.

[0053] <<Bottom damper>> As shown in FIG. 12, the bottom damper 74 is positioned between the bottom holder 62 and the plunger 52. That is, the bottom damper 74 is assembled to the bottom holder 62 so as to be interposed between the bottom holder 62 and the plunger 52. The bottom damper 74 is an annular member having elasticity and a hole 75. The hole 75 opens in the vertical direction. The bottom damper 74 is an example of a buffer portion. When the plunger 52 comes into contact, the bottom damper 74 absorbs the kinetic energy of the plunger 52 moving toward the bottom holder 62.

[0054] Specifically, the bottom damper 74 is positioned with respect to the bottom holder 62 when a shaft 78 described later is inserted into the hole 75 and the lower end portion of the shaft 78 is inserted into the recess 63. Positioning the bottom damper 74 in this way is referred to as the assembly of the bottom damper 74 to the bottom holder 62.

[0055] The bottom damper 74 can be disassembled from the bottom holder 62 while maintaining the biasing state of the coil spring 58 with respect to the plunger 52. In other words, the bottom damper 74 can be taken out (pulled out) in the front-rear direction from the release portion 72 by being slid with respect to the plunger 52 while receiving a biasing force in the vertical direction.

[0056] <<Removing portion>> The removing portion 61 enables at least one of the coil spring 58 and the bottom damper 74 to be removed from between the bottom holder 62 and the top holder 64 while the connecting portion 65 maintains the connection between the bottom holder 62 and the top holder 64. The removing portion 61 includes a through hole 64A provided in the top holder 64. Specifically, the removing portion 61 includes the through hole 64A and the peripheral edge portion of the through hole 64A.

[0057] In this way, the through hole 64A of the top holder 64 functions as the extraction part 61. Since the shaft 78 can pass through the through hole 64A in a state where the connecting part 65 (Fig. 6) maintains the connection between the bottom holder 62 and the top holder 64, the assembly of the shaft 78 to the bottom holder 62 can be released.

[0058] <<Shaft>> The shaft 78 is an example of an assembly member. The shaft 78 is a cylindrical member, and the direction in which the central axis extends is aligned with the vertical direction. The upper end of the shaft 78 is inserted into the through hole 64A of the top holder 64. The lower end of the shaft 78 is inserted into the recess 63 of the bottom holder 62 and is positioned by abutting against the bottom of the recess 63. In this way, the shaft 78 is spanned between the bottom holder 62 and the top holder 64.

[0059] Also, the shaft 78 is inserted through the bottom damper 74, the plunger 52, the coil spring 58, the counterweight 82, the top damper 84, and the through hole 64A. In this way, the shaft 78 vertically penetrates the hole portions 75 of the coil spring 58, the plunger 52, and the bottom damper 74. The shaft 78 is assembled to the bottom holder 62 (by being inserted into the recess 63), making the bottom damper 74 unable to be removed from between the bottom holder 62 and the top holder 64.

[0060] The vertical movement of the shaft 78 is restricted when the striking unit 50 is attached to the housing 12 (Fig. 2). In other words, the vertical movement of the shaft 78 becomes possible when the striking unit 50 is detached from the housing 12.

[0061] <<Counterweight>> As shown in FIG. 6, the counterweight 82 is provided so as to be movable in the vertical direction along the guide portion 66. The counterweight 82 is located above the plunger 52. The counterweight 82 reduces the reaction when the plunger 52 strikes the nail N (FIG. 5). An engagement pin 83 (FIG. 5) is provided on the left side portion of the counterweight 82. The engagement pin 83 can be engaged with and disengaged from the latch 31. An arm portion 89 (FIG. 5) is provided at the rear end portion of the counterweight 82.

[0062] <<Top damper>> As shown in FIG. 12, the top damper 84 is located between the top holder 64 and the counterweight 82 in the vertical direction. The top damper 84 absorbs the kinetic energy of the counterweight 82 moving toward the top holder 64. The top damper 84 is an annular member having a hole portion 85.

[0063] <<Driver blade>> The driver blade 86 shown in FIG. 6 is made of metal and is a plate-shaped member having a predetermined thickness in the front-rear direction. The driver blade 86 extends in the vertical direction. A circular through-hole 87 is formed at the upper end portion of the driver blade 86. The pin 57 of the plunger 52 can be fitted into the through-hole 87. In other words, the driver blade 86 is detachably provided on the plunger 52.

[0064] <Operation of the First Embodiment> The operation of the nail driver 10 of the present embodiment will be described.

[0065] <Driving operation> As shown in FIG. 5, when the second gear 36 and the third gear 38 rotate in a predetermined direction in a state where the plunger 52 is in the standby position, the plunger 52 rises while compressing the coil spring 58. The counterweight 82 descends while compressing the coil spring 58. Then, the plunger 52 rises to the top dead center. The engagement between the cam roller 39B and the arm portion 89 of the counterweight 82 is released.

[0066] After the plunger 52 rises to the top dead center, the cam roller 37B separates from the arm 54 of the plunger 52. As a result, the plunger 52 descends to the bottom dead center under the restoring force (biasing force) of the coil spring 58. At this time, the driver blade 86 also descends to the bottom dead center. Note that even when the engagement between the cam roller 37B and the arm 54 (plunger 52) is released, the movement restriction of the counterweight 82 by the latch 31 is not released. That is, the counterweight 82 does not start to rise simultaneously with the start of the descent of the plunger 52.

[0067] The movement restriction of the latch 31 on the counterweight 82 is released after the plunger 52 descends to a preset position. The counterweight 82 with the movement restriction released rises to the top dead center by the restoring force (biasing force) of the coil spring 58. In this way, by the plunger 52 and the counterweight 82 moving in opposite directions to each other, one driving operation of the nail N is completed.

[0068] Even after the completion of the driving operation, the motor 26 (Figure 2) operates. As a result, the cam roller 35 pushes up the plunger 52. Also, the cam roller 39A pushes down the counterweight 82. Note that before the engagement between the cam roller 35 and the arm 54 is released, the cam roller 37A engages with the arm 54 to push up the plunger 52. Then, before the engagement between the cam roller 37A and the arm 54 is released, the cam roller 37B engages with the arm 54 of the plunger 52 and pushes up the plunger 52 to the standby position.

[0069] Before the engagement between the cam roller 39A and the arm 54 is released, the cam roller 39B engages with the arm 54 to push down the counterweight 82 to the standby position.

[0070] <Replacement of the bottom damper> In the nail driver 10 shown in Fig. 9, when the trigger lever 19 is operated multiple times, the driver blade 86 moves down to the bottom dead center. Then, after the guide plate 43 is removed, the driver blade 86 is removed. Also, by removing screws (not shown), the right housing 14 (Fig. 3) is removed. As a result, the inside of the nail driver 10 is exposed. In this state, the striking unit 50 is taken out from the left housing 13.

[0071] As shown in Fig. 12, in the striking unit 50 alone, since there is no housing 12 (Fig. 2), the movement of the shaft 78 is not restricted. That is, the shaft 78 can move in the vertical direction.

[0072] As shown in Fig. 13, when the plunger 52 is at the bottom dead center position, the biasing force applied by the coil spring 58 to the plunger 52 is small. Therefore, the lower end of the plunger 52 can be easily lifted by the operator. Here, when the spacer 71 is inserted between the plunger 52 and the bottom holder 62 from the rear side, the biasing force (pressing force) acting on the bottom damper 74 becomes small.

[0073] Subsequently, using a tool (not shown), the upper end of the shaft 78 is grasped and the shaft 78 is pulled upward. As a result, the shaft 78 is pulled out from the hole 75 of the bottom damper 74. The bottom damper 74 is taken out from the opening 72 after the shaft 78 is pulled out. In this way, the bottom damper 74 can be taken out without disassembling the striking unit 50.

[0074] When attaching a new bottom damper 74, with the spacer 71 inserted between the plunger 52 and the bottom holder 62, the bottom damper 74 is inserted between the plunger 52 and the bottom holder 62 through the opening 72. Then, when the shaft 78 is pushed down, the lower end of the shaft 78 is inserted into the hole 75. Further, the lower end of the shaft 78 is inserted into the recess 63. In this state, the striking unit 50 is assembled to the left housing 13 (Fig. 2).

[0075] After the striking unit 50 is assembled to the left housing 13, the driver blade 86 (FIG. 6) is attached to the plunger 52. Then, when the right housing 14 (FIG. 3) is attached to the left housing 13, the striking unit 50 is housed inside the housing 12.

[0076] <Summary> Referring to FIGS. 1 to 13, the operation of the nail driver 10 of the first embodiment will be summarized. Note that the description of individual figure numbers is omitted.

[0077] The nail driver 10 has a take-out portion 61 (through hole 64A). Thereby, after the striking unit 50 is removed from the housing 12, the bottom damper 74 can be taken out from between the bottom holder 62 and the top holder 64 while maintaining the connection by the connecting portion 65 between the bottom holder 62 and the top holder 64. When the shaft 78 is pulled up to the vicinity of the top holder 64, the coil spring 58 can also be taken out.

[0078] In this way, at least one of the coil spring 58 and the bottom holder 62 can be taken out from between the bottom holder 62 and the top holder 64 (open portion 72) while maintaining the connection between the bottom holder 62 and the top holder 64. Thereby, compared with a configuration in which the coil spring 58 and the bottom damper 74 cannot be taken out unless all of the striking unit 50 is disassembled, the convenience of the nail driver 10 can be improved.

[0079] In the nail driving machine 10, since the shaft 78 is provided at the center of the striking unit 50, displacement in the front-rear direction and the left-right direction when the plunger 52 and the counterweight 82 move in the vertical direction is suppressed. Here, since the take-out portion 61 (through-hole 64A) is provided in the top holder 64, even with the shaft 78 present, the shaft 78 can be pulled out upward from the top holder 64. That is, with the striking unit 50 not disassembled, the bottom damper 74 can be taken out, and displacement of the plunger 52 and the counterweight 82 during movement can be suppressed.

[0080] In the nail driving machine 10, by moving the shaft 78 in the vertical direction (upward) with respect to the recessed portion 63, the shaft 78 can be removed from the bottom holder 62. Then, the bottom damper 74 can be taken out from the portion (open portion 72) where the shaft 78 has come out of the bottom holder 62. In this way, since the bottom damper 74 can be taken out by moving the shaft 78 in the vertical direction, compared with a configuration in which the entire shaft 78 is removed from the striking unit 50, the bottom damper 74 can be taken out easily.

[0081] In the nail driving machine 10, the shaft 78 passes through the bottom damper 74 which is an example of an annular member. For this reason, in the assembled state of the bottom damper 74 in the striking unit 50, movement in the radial direction of the bottom damper 74 is restricted by the shaft 78. Thereby, displacement in the radial direction of the bottom damper 74 can be suppressed.

[0082] In the nail driving machine 10, the shaft 78 passes through the coil spring 58, the plunger 52, and the bottom damper 74 in the vertical direction. Thereby, the coil spring 58, the plunger 52, and the bottom damper 74 are arranged on the same axis of the shaft 78. Therefore, compared with a configuration in which they are not arranged on the same axis, the nail driving machine 10 can be downsized in the front-rear direction or the left-right direction.

[0083] In the nail driver 10, when the bottom holder 62 is attached to the housing 12, the vertical movement of the shaft 78 is restricted. That is, since the vertical position of the bottom holder 62 is determined by attaching the bottom holder 62 to the housing 12, it is possible to easily position the bottom holder 62 when assembling the bottom holder 62.

[0084] In the nail driver 10, when the coil spring 58 and the bottom damper 74 are taken out through the opening 72, the guide portion 66 restricts the movement of the plunger 52 in the intersecting direction that intersects the vertical direction of the plunger 52. Thereby, when taking out the coil spring 58 and the bottom damper 74, it is possible to suppress the plunger 52 from moving in the intersecting direction and contacting the coil spring 58 and the bottom damper 74. That is, when taking out the coil spring 58 and the bottom damper 74, it is possible to prevent the plunger 52 from interfering with the removal work.

[0085] In the nail driver 10, while maintaining the biasing state of the coil spring 58 with respect to the plunger 52, the assembly of the coil spring 58 with respect to the bottom holder 62 can be released, and the coil spring 58 can be taken out from between the bottom holder 62 and the plunger 52. Thereby, compared with a configuration in which the coil spring 58 cannot be taken out unless everything is disassembled, the convenience of the nail driver 10 can be improved.

[0086] 〔Second Embodiment〕 <Outline of the Working Machine> FIG. 14 shows a nail driver 90 according to the second embodiment. Regarding the components that are the same as or similar to those of the nail driver 10 (FIG. 1) of the first embodiment, the same reference numerals are given and the description thereof is omitted.

[0087] In the stapler 90, the housing 12 (Figure 2) is replaced by the housing 92. Also, the striking unit 50 (Figure 2) is replaced by the striking unit 96. Furthermore, the stapler 90 has a shaft 98 and a regulating pin 102. Note that the striking unit 96 is fixed to the housing 92 with screws (not shown). That is, the striking unit 96 is not detachable from the housing 92.

[0088] <<Housing>> The housing 92 has a basic structure similar to that of the housing 12 (Figure 2), but some of its shapes are different from those of the housing 12. The housing 92 supports the bottom holder 62. A cover member 94 is detachably provided at the front end of the housing 92.

[0089] As shown in Figure 15, an upper side wall portion 92A is provided at the upper end of the housing 92. An upper side hole portion 92B is formed in a portion of the upper side wall portion 92A that faces the through hole 64A in the vertical direction. The upper side hole portion 92B penetrates the upper side wall portion 92A in the vertical direction. Also, the upper side hole portion 92B is a circular hole portion and has a size that allows the shaft 98 to be inserted and moved in the vertical direction.

[0090] <<Window portion>> A window portion 93 is provided at the front end of the housing 92. The window portion 93 is an opening that opens forward. The window portion 93 is an example of a take-out portion, and at least one of the coil spring 58 (Figure 14) and the bottom damper 74 can pass through it. A fastening portion 95 is provided at the upper edge portion of the window portion 93 in the housing 92.

[0091] A fastening hole 95A is formed in the fastening portion 95. The fastening hole 95A penetrates the housing 92 in the left-right direction. The upper end portion of the cover member 94 (Figure 14) is fastened to the fastening hole 95A using screws (not shown), so that the window portion 93 is covered (closed) by the cover member 94. When the fastening of the screws is released and the cover member 94 is removed, the window portion 93 is opened.

[0092] <<Shaft>> Shaft 98 is an example of an assembly member. Shaft 98 is a cylindrical member having an outer diameter approximately the same size as that of the aforementioned shaft 78 (FIG. 4). The central axis of shaft 98 extends along the vertical direction. The vertical length of shaft 98 is longer than the vertical length of shaft 78. Note that in a state where it is assembled to the striking unit 96, the upper end of shaft 98 is positioned below the upper end of the housing 92. A pair of notches 99 arranged in the left - right direction are formed at the upper end of shaft 98. The shape of the notch 99 is a U - shaped opening upward. Shaft 98 can be detached upward from the bottom holder 62 when the regulating pin 102 described later is detached from the housing 92.

[0093] <<Regulating Pin>> Regulating pin 102 is an example of a regulating member and is a cylindrical member whose central axis extends in the left - right direction. Regulating pin 102 is detachably provided on the housing 92. Specifically, the housing 92 is provided with support portions (not shown) that support both end portions in the axial direction of the regulating pin 102. And the regulating pin 102 is detachably provided on the support portion.

[0094] When the regulating pin 102 is in a state of being attached to the support portion of the housing 92, it contacts the notch 99 to regulate the upward movement of the shaft 98. Also, when the regulating pin 102 is detached from the support portion of the housing 92, it no longer contacts the notch 99. That is, the regulation of the upward movement of the shaft 98 is released. In this case, the shaft 98 can be detached upward from the bottom holder 62.

[0095] <Operation of the Second Embodiment> As shown in FIG. 16, in the nail driver 90, when the regulating pin 102 is detached from the support portion of the housing 92, the shaft 98 can be detached from the bottom holder 62 by moving the shaft 98 upward. When the shaft 98 is detached from the bottom holder 62, the bottom damper 74 can move in an intersecting direction that intersects the vertical direction. That is, the bottom damper 74 whose movement in the intersecting direction was regulated by the shaft 98 can be taken out from the inside of the housing 92 through the window portion 93. As a result, it is not necessary to disassemble the housing 92, making it easier to take out the bottom damper 74.

[0096] Furthermore, in the nail driver 90, since the window portion 93 is provided in the housing 92 and the bottom damper 74 can be taken out through the window portion 93, the coil spring 58 (FIG. 14) and the bottom damper 74 can be easily taken out without disassembling the housing 92.

[0097] 〔Third Embodiment〕 <Outline of the Working Machine> FIG. 17 shows a nail driver 110 of the third embodiment. For components that are the same as or similar to those of the nail driver 10 (FIG. 1) and the nail driver 90 (FIG. 14), the same reference numerals are used and the description is omitted.

[0098] In the nail driver 110, the housing 12 (FIG. 2) is replaced with a housing 112. Also, the striking unit 50 (FIG. 2) is replaced with a striking unit 114. Furthermore, the nail driver 110 has a top holder 116, a shaft 118, and a regulating screw 122. Note that the striking unit 114 is fixed to the housing 112 with a screw (not shown). That is, the striking unit 114 is not detachable from the housing 112.

[0099] <<Housing>> The housing 112 has a basic structure similar to that of the housing 12, but some of its shapes are different from those of the housing 12. The housing 112 supports the bottom holder 62. A window portion 93 is provided at the front end of the housing 112. The window portion 93 is opened and closed by attaching and detaching a cover member 94 to and from a fastening portion 95.

[0100] An upper side wall portion 112A is provided at the upper end of the housing 112. An upper side hole portion 112B is formed in the upper side wall portion 112A. The upper side hole portion 112B penetrates the upper side wall portion 112A. Further, the upper side hole portion 112B is a circular hole portion and has a size that allows the shaft 118 to be inserted and moved in the vertical direction.

[0101] <<Top Holder>> As shown in FIG. 18, the top holder 116 is located above the top damper 84. The top holder 116 restricts the coil spring 58 (FIG. 17) from extending above the second regulation position P2 in the vertical direction. The top holder 116 is an example of the other side regulation portion. The top holder 116 has a cylindrical portion 116A having a central axis along the vertical direction, a flange portion 116B protruding radially outward from the lower portion of the cylindrical portion 116A, and a female screw portion 116C formed on the inner peripheral surface of the cylindrical portion 116A. In the female screw portion 116C, the shaft 118 described later is movable in the vertical direction.

[0102] <<Shaft>> The shaft 118 is an example of an assembly member. The shaft 118 is a cylindrical member having an outer diameter of approximately the same size as the shaft 78 (FIG. 4) described above. The central axis of the shaft 118 extends along the vertical direction. The vertical length of the shaft 118 is longer than the vertical length of the shaft 78. In a state where it is assembled to the striking unit 114, the upper end of the shaft 118 is located below the upper end and above the lower end of the top holder 116. The shaft 118 can be detached upward from the bottom holder 62 when the regulating screw 122 described later is detached from the top holder 116.

[0103] <<Regulating Screw>> The regulating screw 122 is an example of a regulating member. The regulating screw 122 has a head portion 122A and a male screw portion 122B. The outer diameter of the head portion 122A is smaller than the inner diameter of the upper hole portion 112B. The male screw portion 122B can be fastened to and detached from the female screw portion 116C of the top holder 116. That is, the regulating screw 122 is detachably provided on the top holder 116. And the regulating screw 122 regulates the vertical movement of the shaft 98 in the state of being attached to the top holder 116.

[0104] 〔Operation of the Third Embodiment〕 As shown in FIG. 19, in the nail driver 110, when the regulating screw 122 is turned to detach the regulating screw 122 from the female screw portion 116C of the top holder 116, the shaft 98 can move upward, so that the shaft 98 can be detached from the bottom holder 62. When the shaft 98 is detached from the bottom holder 62, the bottom damper 74 can move in the intersecting direction intersecting the vertical direction. That is, the bottom damper 74 whose movement in the intersecting direction has been restricted by the shaft 98 can be taken out from the inside of the housing 112 through the window portion 93. Thereby, since it is not necessary to disassemble the housing 112, it becomes easier to take out the bottom damper 74.

[0105] 〔Modification〕 This embodiment is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist thereof. Hereinafter, each modification of this embodiment will be described. Note that descriptions of individual drawing numbers are omitted for configurations that are the same as or similar to the configurations of the nail drivers 10, 90, and 110.

[0106] <Outline of the First Modification> FIG. 20 shows a striking unit 132 which is a part of a nail driver 130 of one modification. In the nail driver 130, the magazine 21 (FIG. 1) and the feeder unit 23 (FIG. 2) are detachably provided with respect to the lower part of the cylindrical portion 15 (FIG. 2) and the lower part of the motor housing portion 16 (FIG. 2).

[0107] In the striking unit 132, the bottom holder 62 (FIG. 6) of the striking unit 50 (FIG. 6) is replaced with the bottom holder 134. Note that the through-hole 64A of the top holder 64 is an example of the other-side insertion portion into which the shaft 78 is inserted so as to be movable in the vertical direction.

[0108] The bottom holder 134 is provided with a take-out portion 131. The take-out portion 131 includes a through-hole 135 provided in the bottom holder 134 and the peripheral edge portion of the through-hole 135. In other words, the through-hole 135 of the bottom holder 134 functions as the take-out portion 131. The through-hole 135 allows the shaft 78 to be taken out (passed through) while the connecting portion 65 (FIG. 6) maintains the connection with the bottom holder 134.

[0109] Further, the striking unit 132 has a cap member 136. The cap member 136 can be fitted into the through-hole 135 and can be removed from the through-hole 135. The cap member 136 is included as an example of one-side restricting portion that restricts the plunger 52 from moving further downward than the lower restricting position.

[0110] <Operation of the First Modification> In the nail driver 130, with the cap member 136 removed, the shaft 78 can be removed from the top damper 84 and the top holder 64 by moving the shaft 78 in the vertical direction (downward) with respect to the top damper 84 and the top holder 64. In other words, by providing the take-out portion 131 in the bottom holder 134, the top damper 84 can be taken out from between the top holder 64 and the counterweight 82. Thus, since the top damper 84 can be taken out by moving the shaft 78 downward in the vertical direction, the top damper 84 can be taken out more easily compared to a configuration in which the entire shaft 78 is removed.

[0111] <Other Modifications> In the nail drivers 10, 90, 110, and 130, the shafts 78 and 98 may not be provided. For example, a configuration in which only the guide portion 66 guides the plunger 52 and the counterweight 82 in the vertical direction may be adopted.

[0112] The extraction parts 61 and 131 are not limited to the parts including the through holes 64A and 135, and may be recessed parts having a depth sufficient for the movement of the shafts 78.

[0113] The bottom damper 74 and the top damper 84 are not limited to annular members, and may be C-shaped members when viewed from the vertical direction.

[0114] The assembling members are not limited to the shafts 78 and 98, and may be cylindrical members or prismatic members.

[0115] The other-side insertion part is not limited to the part composed of the through hole 64A and the peripheral edge of the through hole 64A, and may be a recessed part having a depth sufficient for the movement of the shaft 78.

[0116] In the nail drivers 90 and 110, the coil spring 58 can be taken out from the window part 93 by increasing the movement amounts of the shafts 78 and 98.

[0117] The striking unit may perform striking using a gas spring method. For example, with the pressure in the accumulator chamber maintained to a certain extent, the cylinder is moved upward, a gap is formed between the cylinder (corresponding to the shaft 78) and the nose (corresponding to the bottom holder 62), and the bumper (corresponding to the bottom damper 74) in the cylinder may be removed from the gap.

[0118] The working machine is not limited to the nail driver 10, and may be a machine that operates by the rotation of another motor. As another example of the working machine, a drill used for drilling work may be used.

Explanation of Reference Numerals

[0119] 10... Stapler, 12... Housing, 13... Left housing, 14... Right housing, 15... Cylindrical part, 16... Motor housing part, 18... Gripping part, 19... Trigger lever, 20... Control part, 21... Magazine, 22... Mounting part, 23... Feeder part, 24... Battery, 26... Motor, 28... Gearbox, 29... Support shaft, 31... Latch, 32... Gear part, 34... First gear, 35... Cam roller, 36... Second gear, 37A... Cam roller, 37B... Cam roller, 38... Third gear, 39A... Cam roller, 39B... Cam roller, 42... Injection part, 43... Guide plate, 44... Push lever, 46... Injection passage, 50... Striking unit, 52... Plunger, 53... Base part, 54... Arm, 55... Arm, 56... Arm, 57... Pin, 58... Coil spring, 61... Removal part, 62... Bottom holder, 63... Depressed part, 64... Top holder, 64A... Through hole, 65... Connecting part, 66... Guide part, 67... Right guide rail, 68... Left guide rail, 69... Bolt, 71... Spacer, 72... Open part, 74... Bottom damper, 75... Hole part, 78... Shaft, 82... Counterweight, 83... Engagement pin, 84... Top damper, 85... Hole part, 86... Driver blade, 87... Through hole, 89... Arm part, 90... Stapler, 92... Housing, 92A... Upper wall part, 92B... Upper hole part, 93... Window part, 94... Cover member, 95... Fastening part, 95A... Fastening hole, 96... Striking unit, 98... Shaft, 99... Notch part, 102... Regulation pin, 110... Stapler, 112... Housing, 112A... Upper wall part, 112B... Upper hole part, 114... Striking unit, 116... Top holder, 116A... Cylindrical part, 116B... Flange part, 116C... Female thread part, 118... Shaft, 122... Regulation screw, 122A... Head part, 122B... Male thread part, 130... Stapler, 131... Removal part, 132... Striking unit, 134... Bottom holder, 135... Through hole, 136... Cap member, G... Counterpart, N... Nail, P1... First regulation position, P2... Second regulation position, ST... Slit, TS... Trigger switch

Claims

1. An injection part that supports a stopper, A striking part that strikes the stopper supported by the injection part by moving to one side in the first direction, A biasing part that biases the striking part to one side in the first direction by extending to one side in the first direction, A one-side restricting part that is located between the injection part and the striking part and restricts the striking part from moving to one side beyond the one-side regulating position in the first direction, A other-side restricting part that is located on the other side in the first direction than the biasing part and restricts the biasing part from extending to the other side beyond the other-side regulating position in the first direction, A connecting part that connects the one-side restricting part and the other-side restricting part, A buffer part that is located between the one-side restricting part and the striking part and absorbs the kinetic energy of the striking part moving toward the one-side restricting part, A taking-out part that enables at least one of the biasing part and the buffer part to be taken out from between the one-side restricting part and the other-side restricting part while the connecting part maintains the connection between the one-side restricting part and the other-side restricting part, A working machine.

2. An assembling member is provided that is assembled to the one-side restricting part to make the buffer part non-removable from between the one-side restricting part and the other-side restricting part, The taking-out part is provided on the other-side restricting part, and the assembling of the assembling member to the one-side restricting part can be released while the connecting part maintains the connection between the one-side restricting part and the other-side restricting part. The working machine according to Claim 1.

3. The taking-out part is provided on the other-side restricting part and includes a through-hole through which the assembling member can pass while the connecting part maintains the connection with the one-side restricting part. The working machine according to Claim 2.

4. The buffer part is an annular member having a hole part, The assembling member penetrates through the hole part. The working machine according to Claim 3.

5. The assembling member is a shaft bridged between the one-side restricting part and the other-side restricting part, The shaft penetrates the biasing part, the striking part, and the buffer part in the first direction. The working machine according to Claim 4.

6. The taking-out part is provided on the one-side restricting part and includes a through-hole through which the assembling member can pass while the connecting part maintains the connection with the one-side restricting part. The working machine according to Claim 2.

7. A housing is provided that can be attached to and detached from the one-side restricting part. The assembling member is restricted in movement when the one-side restricting portion is attached to the housing, and becomes movable when the one-side restricting portion is detached from the housing. The working machine according to any one of claims 2 to 6.

8. A housing that supports the one-side restricting portion, and a restricting member that is detachably provided on the housing or the other-side restricting portion and restricts the movement of the assembling member in the attached state. The assembling member can be detached from the one-side restricting portion when the restricting member is detached from the housing or the other-side restricting portion. The working machine according to any one of claims 2 to 6.

9. The taking-out portion is provided in the housing and is a window portion through which at least one of the biasing portion and the buffering portion can pass. The working machine according to claim 8.

10. The connecting portion has a guiding portion that guides the movement of the striking portion in the first direction and restricts the movement of the striking portion in a crossing direction that intersects the first direction, and an opening portion through which at least one of the biasing portion and the buffering portion can pass in the crossing direction. The working machine according to claim 1.

11. An injection portion that supports a stopper, a striking portion that strikes the stopper supported by the injection portion by moving to one side in the first direction, a biasing portion that biases the striking portion to one side in the first direction, a one-side restricting portion that restricts the striking portion from moving to a position beyond a predetermined position to one side in the first direction, and a buffering portion that is assembled to the one-side restricting portion so as to be interposed between the one-side restricting portion and the striking portion and absorbs the kinetic energy of the striking portion moving toward the one-side restricting portion. The buffering portion of the working machine can be disassembled from the one-side restricting portion while maintaining the biasing state of the biasing portion with respect to the striking portion.

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