JP7338703B2 - hammer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving tool having a striking portion capable of striking a fastener and an urging portion for actuating the striking portion.

Patent Literature 1 describes an example of a driving tool that includes a striking portion capable of striking a fastener and an urging portion that operates the striking portion. The driving tool described in Patent Document 1 includes a driver blade as a striking part capable of striking a fastener, a piston fixed to the driver blade, a cylinder in which the piston is operably accommodated, and a cylinder inside. a housing provided.

A pressure accumulation chamber is provided in the housing, and the pressure accumulation chamber is filled with compressed air. Additionally, the housing has a motor case and a handle. An electric motor is provided within the motor case and a wheel is provided that is rotated by the electric motor. Further, a plurality of pins as first engaging portions are provided along the rotation direction of the wheel. The driver blade has a rack as a second engaging portion.

Additionally, a trigger is provided on the handle and a nose portion is attached to the housing. The nose has an ejection passageway. A push switch is attached to the nose. A controller is also provided within the housing. Additionally, a magazine is attached to the housing, the magazine containing the fasteners. The magazine has a supply mechanism, and the fasteners contained in the magazine are supplied to the ejection passage one by one by the supply mechanism.

In the hammering machine disclosed in Patent Document 1, when the push switch is pressed against the workpiece and an operating force is applied to the trigger, the controller rotates the electric motor. The wheel is rotated by an electric motor, and when the pin and rack engage, the driver blade is pushed up and the piston rises. As the piston rises, the air pressure in the accumulator rises. Then, when the pin is released from the rack, the piston and driver blade are pneumatically lowered, and the driver blade drives the stop of the injection passage into the workpiece.

The driving tool described in Patent Document 1 has a lubricating oil supply mechanism. The lubricating oil supply mechanism has a felt that rotates together with the wheel. The felt is impregnated with lubricating oil, and the outer peripheral surface of the pin is in contact with the felt. Therefore, the lubricating oil with which the felt is impregnated is supplied to the surfaces of the pins and also to the rack via the pins. Therefore both the pin and the rack are lubricated.

WO2018-180082

The inventors of the present application have recognized the problem that providing a dedicated lubrication mechanism for lubricating the first engaging portion and the second engaging portion increases the weight of the driving tool.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a driving tool capable of lubricating the first engaging portion and the second engaging portion and suppressing an increase in weight.

A driving tool according to one embodiment includes a striking portion operable in a first direction capable of striking a fastener and a second direction opposite to the first direction; and a first biasing portion that acts in the first direction, and a second biasing portion that acts in the second direction against the biasing force of the first biasing portion by applying a biasing force to the hitting portion. 2 urging portions, wherein the second urging portion includes a motor, a driving member rotated by the motor, a first engaging portion provided on the driving member, and the hitting portion. and a second engaging portion with which the first engaging portion is engaged and released, wherein the driving member includes the rotating shaft and a radial direction of the driving member. A disk member provided outside the rotating shaft and provided with the first engaging portion, a holding portion holding a lubricant, and the lubricant from the holding portion to the first engaging portion and a supply path for supplying.
A driving tool according to one embodiment includes a striking portion operable in a first direction capable of striking a fastener and a second direction opposite to the first direction; and a first biasing portion that acts in the first direction, and a second biasing portion that acts in the second direction against the biasing force of the first biasing portion by applying a biasing force to the hitting portion. 2 urging portions, wherein the second urging portion includes a motor, a driving member rotated by the motor, a first engaging portion provided on the driving member, and the hitting portion on the hitting portion. and a plurality of second engaging portions provided at intervals in the operating direction of the striking portion and with which the first engaging portion is engaged and released. The driving member includes a rotating shaft, a plurality of first engaging portions provided outside the rotating shaft in the radial direction of the driving member and spaced apart in the rotating direction of the driving member, and A plurality of arms arranged at intervals in a rotational direction, comprising: a connecting portion connecting the rotating shaft and the first engaging portion; a holding portion holding lubricant; the rotating shaft and the connecting portion; and a supply path provided over the portion to supply the lubricant from the holding portion to the first engaging portion. The plurality of first engaging portions includes a last engaging portion that is engaged with the second engaging portion last in the rotational direction of the driving member, and a last engaging portion that is engaged with the second engaging portion. and a normal engaging portion that is engaged with the second engaging portion at a time prior to being engaged. The plurality of arms includes a final arm connecting the final engaging portion and the rotating shaft, and a normal arm connecting the normal engaging portion and the rotating shaft. In the direction of rotation of the drive member, the thickness of the final arm is greater than the thickness of the normal arm.

In one embodiment of the driving tool, the drive member has the holding portion and the supply path, and there is no need to provide a dedicated lubrication mechanism. Therefore, an increase in the number of parts can be suppressed, and an increase in the weight of the fastening tool can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing the appearance of a fastening tool that is an embodiment of the present invention; Fig. 2 is a right side view of the tool shown in Fig. 1; FIG. 3 is a front cross-sectional view of the fastening tool of FIG. 2 taken along line III-III; 4 is a sectional view showing the internal structure of the motor case of the fastening tool shown in FIG. 3; FIG. Fig. 3 is an enlarged cross-sectional view of a driving member of the driving machine; FIG. 6 is a cross-sectional view of the driving member of FIG. 5 taken along line VI-VI; It is a schematic diagram which shows the structure of a drive member. 3 is a block diagram showing a control system of the fastening tool; FIG. Fig. 4 is a front cross-sectional view of a state in which the striking part of the fastening tool is positioned at the top dead center; Fig. 4 is a front cross-sectional view of a state in which the striking part of the fastening tool is positioned at the bottom dead center; FIG. 9 is an enlarged view showing a main part of FIG. 8; FIG. 10 is a front cross-sectional view showing another example of the fastening tool; FIG. 12 is a schematic diagram showing a driving member provided in the fastening tool of FIG. 11;

An embodiment of the fastening tool of the present invention will be described with reference to the drawings.

1, 2 and 3 show a tool 10. FIG. The driving machine 10 is a nail driving machine, and has a housing 11 , a striking part 12 , a nose part 13 , a power supply part 14 , an electric motor 15 , a reduction gear 16 and a pressure accumulator container 18 . The housing 11 has a body portion 19 , a handle 20 , a motor case 21 and a mounting portion 22 . The body portion 19 has a cylindrical shape, and the handle 20 and the motor case 21 are connected to the body portion 19 . The mounting portion 22 is connected to the handle 20 and the motor case 21 .

The power supply unit 14 can be attached to and removed from the mounting unit 22 . The electric motor 15 is arranged inside the motor case 21 . The pressure accumulator container 18 is provided inside the body portion 19 . A cylinder 27 is accommodated within the body portion 19 . The pressure accumulator container 18 is attached to the outer surface of the cylinder 27 . A pressure chamber 26 is formed within the pressure accumulator vessel 18 and within the cylinder 27 . The pressure chamber 26 is filled with a compressible fluid. For example, air or inert gas can be used as the compressible fluid. Inert gas includes, for example, nitrogen gas and rare gas. In this embodiment, it is assumed that the pressure chamber 26 is filled with air having a pressure higher than the atmospheric pressure.

The striking part 12 is arranged from the inside to the outside of the housing 11 . The striking part 12 has a piston 28 and a driver blade 29 . The piston 28 is operable within the cylinder 27 in a direction along the centerline A1. A centerline A1 passes through the center of the cylinder. A seal member 120 is attached to the piston 28 . The seal member 120 forms a seal surface in contact with the inner peripheral surface of the cylinder 27 . The driver blade 29 is, for example, made of metal, non-ferrous metal, or steel. In the striking portion 12 shown in FIG. 3, the piston 28 and the driver blade 29 are provided as separate members, and the piston 28 and the driver blade 29 are connected. Driver blade 29 has a rack. The rack has a plurality of projections, for example seven projections 61 , 62 , 63 , 64 , 65 , 66 , 67 , spaced apart in the direction of actuation of the driver blade 29 .

The nose portion 13 is arranged inside and outside the body portion 19 . The nose portion 13 has a bumper support portion 31 , an injection portion 32 and a cylinder portion 33 . A bumper 35 is arranged in the bumper support portion 31 . The bumper 35 has guide holes 36 . The driver blade 29 is arranged within the guide hole 36 .

The striking part 12 is operable in a first direction D1 and a second direction D2 along the centerline A1. The first direction D1 and the second direction D2 are opposite directions to each other. The first direction D1 is the direction in which the piston 28 approaches the bumper 35 . The second direction D2 is the direction in which the piston 28 moves away from the bumper 35 . The striking part 12 receives the pressure of the compressed air filled in the pressure chamber 26 shown in FIG. 1, and the striking part 12 is always urged in the first direction D1. The actuation of the striking part 12 in the first direction D1 can be defined as descending. The actuation of the striking part 12 in the second direction D2 can be defined as raising.

The injection part 32 is connected to the cylindrical part 33 and protrudes from the bumper support part 31 in a direction along the center line A1. The injection section 32 has a blade guide 32A and a guide plate 32B. An ejection path 37 shown in FIG. 3 is provided between the blade guide 32A and the guide plate 32B. The exit path 37 is a space in the direction along the centerline A1. The driver blade 29 is operable within the injection path 37 in a direction along the centerline A1. Blade guide 32A and guide plate 32B guide the operation of driver blade 29. As shown in FIG.

As shown in FIG. 4, the electric motor 15 is arranged inside the motor case 21 . The electric motor 15 is a brushless motor and has a rotor 39 and a stator 40 . The stator 40 is attached to the motor case 21 . The rotor 39 is attached to a rotor shaft 41 , and a first end of the rotor shaft 41 is rotatably supported by the motor case 21 via a bearing 42 . The electric motor 15 is a brushless motor, and when voltage is applied to the electric motor 15, the rotor 39 rotates about the center line A2.

A gear case 43 is provided over the inside of the motor case 21 and the inside of the cylindrical portion 33 . The gear case 43 has a cylindrical shape. The reduction gear 16 is provided inside the gear case 43 . The speed reducer 16 comprises an input element 44, an output element 45 and multiple sets of planetary gear mechanisms. Input element 44 is coupled to rotor shaft 41 . Input element 44 is rotatably supported by bearing 46 . When the rotational force of the electric motor 15 is transmitted to the input element 44 of the speed reducer 16, the rotational speed of the output element 45 becomes lower than the rotational speed of the input element.

A drive member 47 is provided within the barrel portion 33 . The drive member 47 has a wheel axle 48 and a wheel 49 as shown in FIG. The wheel shaft 48 and wheel 49 are made of metal and are integral. A wheel axle 48 is connected to the output element 45 . When the rotational force of the electric motor 15 is transmitted to the wheel shaft 48 via the speed reducer 16, the driving member 47 can rotate counterclockwise in FIG.

The wheel shaft 48 is rotatably supported by the cylindrical portion 33 via bearings 50 and 51 . 3, 6A, and 6B, the driving member 47 has a plurality of pins 71, 72, 73, 74, 75, 76, and 77, for example, seven pins. Each of the seven pins 71, 72, 73, 74, 75, 76, 77 is made of metal. All of the seven pins 71, 72, 73, 74, 75, 76, 77 are cylindrical. The seven pins 71, 72, 73, 74, 75, 76, 77 have a circular outer surface shape in a plane perpendicular to the center line A2. Also, the diameter of pin 77 is larger than the diameter of each of pins 71 , 72 , 73 , 74 , 75 , 76 . The diameters of the pins 71, 72, 73, 74, 75, 76 are the same. The respective centers C1 of the pins 71, 72, 73, 74, 75, 76 are arranged at regular intervals on the virtual circle E1. The virtual circle E1 is a circle centered on the center line A2. The center C1 of the pin 77 is arranged inside the virtual circle E1.

In this embodiment, the pins 71 , 72 , 73 , 74 , 75 , 76 , 77 are arranged in this order in the direction of rotation of the driving member 47 when the driving member 47 rotates in the counterclockwise direction D<b>3 . The spacing between pins 77 and 71 in the direction of rotation of drive member 47 is greater than the spacing between other pins.

Wheel 49 has a guide hole 80 in which pin 71 is movable. When the pin 71 moves within the guide hole 80 , the position of the pin 71 in the radial direction of the drive member 47 is changed. The pin 71 is biased outward in the radial direction of the driving member 47 by an elastic member such as a metal spring.

As shown in FIG. 4, a rotation restricting mechanism 81 is provided inside the gear case 43 . The rotation restricting mechanism 81 enables the driving member 47 to rotate counterclockwise in FIGS. 3 and 5 with the torque generated when the electric motor 15 rotates forward. The rotation restricting mechanism 81 prevents the driving member 47 from rotating clockwise with a torque different from the torque of the electric motor 15 .

A trigger 82 shown in FIG. 2 is provided on the handle 20 . The power supply unit 14 has a housing case and a plurality of battery cells housed in the housing case. A battery cell is a secondary battery that can be charged and discharged. Furthermore, a magazine 83 is provided, and the magazine 83 is supported by the injection section 32 and the mounting section 22 . A stopper 84 is housed in the magazine 83 . The fastener 84 is, for example, a shaft-shaped nail. The magazine 83 has a feeder that feeds the fasteners 84 in the magazine 83 to the ejection path 37 .

A control system of the fastening tool 10 is constructed as shown in FIG. A control section 85 is provided in the mounting section 22 . The control unit 85 has an input/output interface, a control circuit, an arithmetic processing unit, and a storage unit. Also, an inverter circuit 86 is provided in the motor case 21 . The inverter circuit 86 connects and disconnects the stator 40 of the electric motor 15 and the power supply section 14 . The inverter circuit 86 has a plurality of switching elements, and each of the plurality of switching elements can be turned on and off.

A push switch 87 and a position detection sensor 88 are also provided on the housing 11 . The push switch 87 detects whether the tip of the ejector 32 is pressed against or separated from the counterpart material W1 and outputs a signal. The position detection sensor 88 detects the position of the drive member 47 in the rotational direction and outputs a signal. Additionally, a trigger switch 89 is provided within the handle 20 . A trigger switch 89 detects whether an operating force is applied to the trigger 82 or is released, and outputs a signal. The control unit 85 processes signals from the push switch 87 , the position detection sensor 88 and the trigger switch 89 . The control section 85 can process the signal of the position detection sensor 88 to estimate the position of the hitting section 12 in the direction along the center line A1. The control unit 85 controls the rotation and stop of the electric motor 15 , the rotation speed of the electric motor 15 , and the rotation direction of the electric motor 15 by controlling the inverter circuit 86 .

Next, a usage example of the fastening tool 10 will be described. The control unit 85 supplies electric power to the electric motor 15 when detecting at least one of the fact that no operating force is applied to the trigger 82 and the fact that the tip of the injection unit 32 is not pressed against the counterpart material W1. to stop. Therefore, the electric motor 15 is stopped, and the striking portion 12 is stopped at the position shown in FIG.

Here, the position where the piston 28 is separated from the bumper 35 and the striking part 12 is stopped as shown in FIG. A pin 77 is engaged with the protrusion 67 . Pins 71, 72, 73, 74, 75, 76 are released from corresponding projections 61, 62, 63, 64, 65, 66, 67, respectively. The air pressure in the pressure chamber 26 is always applied to the striking portion 12, and the striking portion 12 is biased in the first direction D1. The biasing force in the first direction D<b>1 applied to the striking portion 12 is transmitted to the driving member 47 via the projection 67 and the pin 77 . Although the driving member 47 is biased clockwise in FIG. 3, the rotation restricting mechanism 81 prevents the driving member 47 from rotating. Based on this principle, the striking part 12 is stopped at the standby position shown in FIG.

When the control unit 85 detects that an operation force is applied to the trigger 82 and that the injection unit 32 is pressed against the counterpart material W1, the control unit 85 causes the power supply unit 14 to apply a voltage to the electric motor 15, thereby The motor 15 is rotated forward. The rotational force of the electric motor 15 is transmitted to the drive member 47 via the speed reducer 16 . Then, the driving member 47 rotates counterclockwise in FIG. 3, and the striking part 12 rises. As the striking part 12 rises, the air pressure in the pressure chamber 26 rises. As shown in FIG. 8, the position of the striking portion 12 when the piston 28 is most distant from the bumper 35 is the top dead center.

When the pin 77 is released from the protrusion 67 , the striking part 12 is lowered by the air pressure in the pressure chamber 26 . In the stroke in which the striking part 12 descends from the top dead center, all the pins 71, 72, 72, 74, 75, 76, 77 and the projections 67, 66, 65, 64, 63, 62, 61 are aligned with the center line A1. It is located outside the operating range that operates in the direction along. When the hitting part 12 descends, the driver blade 29 can hit one stopper 84 located in the injection path 37 . The hammered fastener 84 is driven into the mating member W1.

The piston 28 collides with the bumper 35 after the stopper 84 is driven into the mating member W1. Bumper 35 absorbs a portion of the kinetic energy of striking portion 12 . The state in which the piston 28 contacts the bumper 35 as shown in FIG. 9 is the bottom dead center of the striking portion 12 . When the hitting part 12 drives the stopper 84 into the counterpart material W1, the tip of the injection part 32 is separated from the counterpart material W1 by the recoil.

The control section 85 continues the rotation of the electric motor 15 even after the striking section 12 reaches the bottom dead center and the tip of the injection section 32 is separated from the counterpart material W1. As a result, the drive member 47 is rotated counterclockwise and the pin 71 is engaged with the projection 61 . That is, the striking part 12 is lifted from the bottom dead center against the air pressure in the pressure chamber 26 .

In the process of lifting the striking part 12, the pin 72 is engaged and released from the projection 62, the pin 73 is engaged and released from the projection 63, the pin 74 is engaged and released from the projection 64, the pin 75 is engaged and released from the projection 65. , and pin 76 engages and releases projection 66 . When the controller 85 detects that the striking part 12 has reached the standby position as shown in FIG. 3, the controller 85 stops the electric motor 15 .

Furthermore, the configuration of the drive member 47 will be specifically described. As shown in FIG. 5, the cross-sectional shape of the wheel 49 is U-shaped in the plane containing the center line A2. A plurality of rims 93 , 94 , 95 , 96 , 97 , 98 connecting the wheel shaft 48 and the wheel 49 are provided. A plurality of limbs 93, 94, 95, 96, 97, 98 are provided, each of which can also be defined as an arm. 6A, a plurality of rims 93, 94, 95, 96, 97, 98 are spaced apart in the direction of rotation of drive member 47. As shown in FIG. A space 101 is provided between each rim in the direction of rotation of the drive member 47 . As shown in FIG. 5, the thickness T1 of each of the plurality of rims 93, 94, 95, 96, 97, 98 is the same in the direction along the centerline A2. The thickness T2 of the wheel 49 in the direction along the centerline A2 is greater than the thickness T1. The thicknesses T1, T2 can each be defined as a dimension.

In the radial direction of the drive member 47, the rim 93 is connected to the wheel 49 inside the pin 72, the rim 94 is connected to the wheel 49 inside the pin 73, and the rim 95 is connected to the wheel 49 inside the pin 74. A rim 96 is connected to the wheel 49 inside the pin 75 , a rim 97 is connected to the wheel 49 inside the pin 76 , and a rim 98 is connected to the wheel 49 inside the pin 77 .

Each pin is independently engaged and released with each projection. The position where the engagement between each pin and each protrusion starts is between the center line A2 and the tip of the injection part 32 in the direction of operation of the driver blade 29 in FIG. The position where engagement between each pin and each projection starts is below the center line A2 in FIG. The position where each pin and each projection are released is between the centerline A2 and the bumper 35 in the operating direction of the driver blade 29 shown in FIG. The position where each pin and each projection are released is above the center line A2 in FIG.

10 shows the state immediately before the pin 77 is released from the projection 67 for convenience. The load F1 that the pin receives from the protrusion increases as the driver blade 29 operates in the second direction D2 from the time the pin and the protrusion are engaged. Further, the pin 77 and the protrusion 67 are engaged with each other when the hitting portion 12 is positioned at the top dead center as shown in FIG. Therefore, the load F1 experienced by the pin 77 shown in FIG. 10 is higher than the load F1 experienced by other pins engaged with the projections. In particular, the load F1 received by the pin 77 just before it is released from the protrusion 67 is the highest value.

The load received by pin 73 is transmitted to rim 94, the load received by pin 74 is transmitted to rim 95, the load received by pin 75 is transmitted to rim 96, the load received by pin 76 is transmitted to rim 97, and the load received by pin 76 is transmitted to rim 97. loads are transferred to the rim 98 .

In FIG. 6B, which represents a plane perpendicular to centerline A2, rim 98 has edges 98A and 98B and rim 97 has edges 97A and 97B. Rim 96 also has edges 96A and 96B, and rim 95 has edges 95A and 95B. The edge portion 98A is located behind the edge portion 98B in the rotational direction of the driving member 47 . The edge portion 97A is located behind the edge portion 97B in the rotational direction of the driving member 47 . The edge portion 96A is located behind the edge portion 96B in the rotational direction of the driving member 47 . The edge portion 95A is located behind the edge portion 95B in the rotational direction of the drive member 47 .

The radius of the virtual circle E1 and the diameter of each pin are set based on the load F1 that each pin receives from each protrusion of the driver blade 29 in FIG. The load F1 is determined based on the distance between each projection and the center line A2 and the air pressure in the pressure chamber 26. FIG. The distance between each protrusion and the center line A2 is the distance in the direction along the imaginary line B1. In FIG. 10 representing a plane perpendicular to the centerline A2, the imaginary line B1 is a straight line that intersects the centerline A1 at 90 degrees.

Further, the widthwise center line G1 of the rim 98 passes through the center C1 of the rim 98 . A center line G2 in the width direction of the rim 97 passes through the center C1 of the rim 97. As shown in FIG. A center line G3 in the width direction of the rim 96 passes through the center C1 of the rim 96. As shown in FIG. A center line G4 in the width direction of the rim 95 passes through the center C1 of the rim 95. As shown in FIG. The width L1 of the rim 98, the width L2 of the rim 97, the width L3 of the rim 96, and the width L4 of the rim 95 are determined based on the load F1 that each pin receives from each protrusion. Edges 98A, 97A, 96A, and 95 are arranged on respective tangent lines H1. In FIG. 6B, which is a plan view perpendicular to the centerline A2, the outer peripheral surface 48A of the wheel axle 48 is circular. Each tangent line H1 is in contact with the outer peripheral surface 48A of the wheel shaft 48. As shown in FIG. The outer peripheral surface 48A is a portion of the wheel shaft 48 where each rim is connected. The width of each rim is the width of each rim in a direction perpendicular to the centerline of each rim.

Further, the width L1 is larger than the width L2, the width L2 is larger than the width L3, and the width L3 is larger than the width L4. That is, rim 98 is stronger than rim 97 , rim 97 is stronger than rim 96 , and rim 96 is stronger than rim 95 . The load F1 becomes maximum when the pin 77 and the projection 67 are engaged. On the other hand, by setting the strength of the rim 98 high, the weight of the wheel 49 is reduced and the durability of the wheel 49 is improved.

By the way, just before each pin is released from each protrusion, each pin receives the highest load. In this embodiment, the tangents of the respective rims are set to contact the outer peripheral surface 48A. For this reason, just before each pin is released from each protrusion, as shown in FIG. The side angle θ1 can be 45 degrees or more. In a plane perpendicular to centerline A2, straight line B2 is parallel to imaginary line B1. Therefore, deformation of each rim can be suppressed.

Further, as the drive member 47 is rotated, each pin and each projection are engaged and disengaged. For this reason, the drive member 47 is provided with a lubricating mechanism for lubricating the portions where each pin and each protrusion are engaged and disengaged. A lubrication mechanism 90 shown in FIG. 5 has a holding hole 91 and a supply passage 92 . The holding hole 91 is provided in the wheel shaft 48 . The holding hole 91 is provided around the center line A2. That is, the wheel shaft 48 is a cylindrical body having the holding holes 91 .

A supply channel 92 connects to the retaining hole 91 and extends across the rim 98 and the wheel 49 . The outermost open end 92 A of the feed channel 92 in the radial direction of the drive member 47 is located between the wheel axle 48 and the pin 77 . Furthermore, the holding hole 91 contains a lubricant such as grease. Grease is a gel-like substance in which liquid lubricating oil is held by a thickener. The viscosity of grease is higher than that of lubricating oil alone.

When the temperature of the wheel shaft 48 rises due to the frictional heat generated by the engagement and sliding of the pin and the projection, the grease melts and lubricating oil is supplied from the holding hole 91 to the surface of the wheel 49 through the supply passage 92 . As the drive member 47 rotates, centrifugal force supplies lubricating oil to the surface of the wheel 49 . Therefore, each pin and each protrusion can be lubricated, and each pin and each protrusion can be suppressed from being worn or deformed. Ends of the holding holes 91 in the direction along the center line A2 are closed with plugs 100, respectively. Therefore, grease can be prevented from leaking from the end of the holding hole 91 in the direction of the center line A2. As shown in FIG. 4, the tubular portion 33 has a hole 33A. A user can remove the plug 100 and supply grease from the hole 33A to the retaining hole 91 .

In the driving tool 10 of this embodiment, the wheel shaft 48 is provided with a holding hole 91 for accommodating grease. That is, the wheel axle 48 is hollow. Therefore, it is not necessary to provide a dedicated component other than the driving member 47 as the lubricating mechanism 90 . Therefore, an increase in the number of parts of the fastening tool 10 can be suppressed, and an increase in the weight of the fastening tool 10 can be suppressed. In other words, it is possible to reduce the weight of the fastening tool 10 . A space 101 is also provided between each rim. Therefore, the weight of the fastening tool 10 can be further reduced.

FIG. 11 is a front sectional view showing another example of the fastening tool 10. As shown in FIG. The driving member 47 has a pin 102 and a gear 103 as shown in FIG. Pin 102 is movable within guide hole 104 . Gear 103 has teeth 105 , 106 , 107 , 108 , 109 , 110 . Pin 102 and teeth 105 , 106 , 107 , 108 , 109 , 110 are spaced apart in the direction of rotation of drive member 47 .

As drive member 47 rotates counterclockwise D3, pin 102 can engage and disengage projection 61, tooth 105 can engage and disengage projection 62, and tooth 106 can engage projection 63. teeth 107 are engageable and releasable from projection 64, teeth 108 are engageable and releasable from projection 65, and teeth 109 are engageable and releasable from projection 66; , and teeth 110 are engageable and disengageable from protrusions 67 . Therefore, when the pin 102 or any tooth is engaged with any protrusion, the striking portion 12 is lifted. When the pins 102 and teeth are all released from the projections, the striking portion 12 descends.

Tangent lines H2 passing through the edges of teeth 107 , 108 , 109 , 110 all contact the outer peripheral surface 48 A of the wheel axle 48 . Width L5 of tooth 110 is greater than width L6 of tooth 109, width L6 of tooth 109 is greater than width L7 of tooth 108, and width L6 of tooth 108 is greater than width L8 of tooth 107. The wheel shaft 48 has a holding hole 91 to which a supply path 111 is connected. The supply channel 111 is provided on the tooth 110 and is open on the surface of the tooth 110 . The lubricating oil of the grease accommodated in the holding hole 91 passes through the supply path 111 and is supplied to the contact portion between the tooth and the projection and the contact portion between the pin 102 and the projection 61 . Therefore, the pin 102 and each protrusion can be lubricated.

An example of the technical meaning of the matters disclosed in the present embodiment is as follows. The fastening tool 10 is an example of a fastening tool. The first direction D1 in which the striking portion 12 descends is an example of the first direction. The second direction D2 in which the striking portion 12 rises is an example of the second direction. The hitting part 12 is an example of a hitting part. The pressure accumulator container 18 is an example of a first urging portion. The driving member 47 is an example of a driving member. The wheel shaft 48 is an example of a rotating shaft. Wheel 49 is an example of a disk member. The electric motor 15, the driving member 47, the pins 71 to 77, and the projections 61 to 67 are examples of the second biasing portion. The electric motor 15 is an example of an electric motor. Each of the pins 71 to 77 is an example of the first engaging portion. Each of the protrusions 61 to 67 is an example of the second engaging portion. Also, the pin 102 and the teeth 105 to 110 are examples of the first engaging portion and the second biasing portion, respectively. Pins 71 and 102 are examples of first engaging portions. The holding hole 91 is an example of a holding portion. The supply paths 92 and 111 are examples of supply paths. Rims 93-98 are examples of connecting parts and arms. Rim 98 is an example of a final arm. Rims 95-97 are examples of normal arms. The width L1 is an example of the thickness of the final arm, and the widths L2 to L4 are examples of the thickness of the normal arms. Space 101 is an example of space.

Pin 77 is an example of a final engaging portion. The diameter of pin 77 is an example of the thickness of the last engagement portion. Each of the pins 71 to 76 is an example of a wheel engaging portion and an example of a normal engaging portion. Each diameter of the pins 71 to 76 is an example of the thickness of the normal engagement portion. Tooth 110 is an example of a last engagement. Each of teeth 105 to 109 is an example of a normal engaging portion. The width L5 is an example of the thickness of the last engaging portion. Widths L6 to L8 are examples of the thickness of the normal engagement portion. The centerline A2 is an example of a rotation centerline. FIG. 6B is an example of a plane perpendicular to the rotation centerline of the rotating member. 48 A of outer peripheral surfaces of the wheel shaft 48 are an example of the outer surface of a rotating member. Each of the tangents H1 and H2 is an example of a tangent.

The fastening tool is not limited to the above embodiment, and can be modified in various ways without departing from the scope of the invention. For example, the first urging portion may be a pressure accumulator that operates the striking portion by the pressure of the compressible fluid, an elastic force of a solid spring that operates the striking portion, or a repulsive force or attractive force of a magnet that operates the striking portion. including those that cause The supply path is sufficient as long as the lubricant can pass through, and the supply path includes passages, gaps, holes, and grooves. The first engaging portion and the second engaging portion need only be capable of engaging and disengaging with each other, and the first engaging portion and the second engaging portion may be pins, teeth, or protrusions, respectively. Also, the lubricant may be lubricating oil alone instead of grease. The power supply section that supplies power to the electric motor may be either a DC power supply or an AC power supply. Additionally, fasteners include shaft-shaped nails, arch-shaped tackers, tacks, and the like.

DESCRIPTION OF SYMBOLS 10... Driving machine 12... Impact part 15... Electric motor 18... Accumulator container 47... Drive member 48... Wheel shaft 48A... Outer peripheral surface 49... Wheel 61-67... Projection 71-77, 102... Pin, 92, 111... Supply path, 93-98... Rim, 101... Space, 105-110... Teeth, A2... Center line, D1... First direction, D2... Second direction, H1, H2... Tangent line, L1 to L8...Width

Claims (8)

a striking portion operable in a first direction capable of striking the fastener and in a second direction opposite to the first direction;
a first biasing portion that applies a biasing force to the hitting portion to operate it in the first direction;
a second biasing portion that applies a biasing force to the hitting portion to operate the hitting portion in the second direction against the biasing force of the first biasing portion;
has
The second biasing part is
a motor;
a driving member rotated by the motor;
a first engaging portion provided on the driving member;
a second engaging portion provided in the hitting portion and with which the first engaging portion engages and releases;
A fastening tool comprising:
The driving member is
a rotating shaft;
the first engaging portion provided outside the rotating shaft in the radial direction of the driving member;
a holding portion that is a hole provided in the rotating shaft and holds a lubricant;
a supply passage for supplying the lubricant from the holding portion to the first engaging portion;
A fastening tool. The driving member has a connecting portion that connects the rotating shaft and the first engaging portion,
2. The driving tool according to claim 1 , wherein said supply path is provided over said rotating shaft and said connecting portion. the connecting portion is a plurality of arms arranged at intervals in the rotational direction of the driving member;
3. The tool of claim 2 , wherein a space is provided between said arms in the direction of rotation of said drive member. A plurality of the first engaging portions are provided at intervals in the rotational direction of the driving member,
A plurality of the second engaging portions are provided at intervals in the operating direction of the striking portion,
4. The driving tool according to claim 3 , wherein said plurality of arms are arranged between said rotating shaft and said first engaging portion in the radial direction of said driving member. The plurality of first engaging portions are
a final engaging portion that is engaged with the second engaging portion last in the rotational direction of the driving member;
a first engagement portion that is first engaged with the second engagement portion in the rotational direction of the drive member;
5. The driving tool according to claim 4 , wherein the thickness of said last engagement portion is greater than the thickness of said first engagement portion in the direction of rotation of said drive member. In a plan view perpendicular to the rotation center line of the driving member, the outer surface shape of the rotating shaft is circular,
6. The fastening tool according to any one of claims 3 to 5 , wherein said arm is arranged in a direction along a tangential line contacting the outer surface of said rotating shaft. The driving tool according to any one of claims 1 to 5 , wherein the first engaging portion has a cylindrical shape. a striking portion operable in a first direction capable of striking the fastener and in a second direction opposite to the first direction;
a first biasing portion that applies a biasing force to the hitting portion to operate it in the first direction;
a second biasing portion that applies a biasing force to the hitting portion to operate the hitting portion in the second direction against the biasing force of the first biasing portion;
has
The second biasing part is
a motor;
a driving member rotated by the motor;
a first engaging portion provided on the driving member;
a plurality of second engaging portions provided in the striking portion at intervals in the direction in which the striking portion operates, and with which the first engaging portion is engaged and released;
A fastening tool comprising:
The driving member is
a rotating shaft;
a plurality of first engaging portions provided at intervals in the rotational direction of the driving member outside the rotating shaft in the radial direction of the driving member;
a plurality of arms arranged at intervals in the rotational direction of the driving member, the connecting portion connecting the rotating shaft and the first engaging portion;
a holding part holding a lubricant;
a supply passage provided over the rotating shaft and the connecting portion for supplying the lubricant from the holding portion to the first engaging portion;
has
The plurality of first engaging portions are
a final engaging portion that is engaged with the second engaging portion last in the rotational direction of the driving member;
a normal engagement portion engaged with the second engagement portion at a time before the final engagement portion is engaged with the second engagement portion;
including
The plurality of arms are
a final arm that connects the final engaging portion and the rotating shaft;
a normal arm that connects the normal engaging portion and the rotating shaft;
including
A tool according to claim 1, wherein in the direction of rotation of the drive member the thickness of the final arm is greater than the thickness of the normal arm.

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