WO2018159331A1

WO2018159331A1 - Hammering tool

Info

Publication number: WO2018159331A1
Application number: PCT/JP2018/005520
Authority: WO
Inventors: 秋葉　美隆
Original assignee: 株式会社マキタ
Priority date: 2017-02-28
Filing date: 2018-02-16
Publication date: 2018-09-07
Also published as: JP2018140480A

Abstract

A nail gun 1 is provided with a motor 2, a driver 3, a return mechanism 7, and a rear stopper portion 9. As a result of the driving of the motor 2, the driver 3 moves forward from an initial position to a hammering position along an operation line L, thereby striking a nail 101 and ejecting the nail 101 from an ejection port 123. The return mechanism 7 moves the driver 3 rearward from the hammering position toward the initial position. The rear stopper portion 9 is configured to position the driver 3 at the initial position by coming into contact with a rear end portion 32 of the driver 3 moved rearward by the return mechanism 7 and to prevent the driver 3 from bouncing back to a position frontward of the position of contact with the rear stopper portion 9 by the impact of the contact with the rear stopper portion 9.

Description

Driving tool

The present invention relates to a driving tool for driving a driving material into a workpiece by injecting the driving material from an injection port.

A driving tool configured to inject a driving material such as a nail by driving the driver linearly from the rear to the front and to drive the workpiece into the workpiece is known. In such a driving tool, the driver returns to the rear after injecting the driving material. However, there is a possibility that the driver will bounce forward due to the impact at this time and inject the next driving material when the user does not intend. Thus, for example, U.S. Pat. No. 7,726,536 discloses a driving tool capable of regulating the rebound direction of a driver using a bumper. Specifically, the bumper of this driving tool is provided with a cavity having an inclined surface. When the driver receives the rotational energy of the flywheel, moves forward, injects the driving material, and then returns to the rear, the curved surface at the rear end of the driver collides with the inclined surface of the bumper. Thereby, since the driver deviates upward with respect to the driving shaft of the driver when rebounding forward, contact with the flywheel is avoided.

The above-mentioned driving tool allows the driver to rebound to the front itself, and diverts the rebounding direction from the flywheel by the bumper, thereby reducing the possibility of injection of the driving material due to the rebounding. However, there is room for further improvement in the driving tool from the viewpoint of more reliably reducing the possibility that the driving material is injected in a manner different from the user's intention.

In view of such circumstances, the present invention reduces the possibility that a driving material is injected in a manner different from the user's intention in a driving tool configured to drive the driving material into a workpiece by a driver. It is an issue to provide the technology.

According to one aspect of the present invention, an electric driving tool configured to drive a driving material into a workpiece by injecting the driving material from an injection port is provided. The driving tool includes a motor, a driver, a return mechanism, and a contact member.

The driver is held movably between a rear position and a front position ahead of the rear position along a predetermined operation line extending in the front-rear direction of the driving tool. In addition, the driver is configured to hit the driving material and eject it from the injection port by moving from the rear position to the front position by driving the motor. The return mechanism is configured to move the driver backward from the front position toward the rear position. The contact member is configured to position the driver at the rear position by contacting the rear end portion of the driver moved rearward by the return mechanism. Further, the contact member is configured to prevent the driver from bouncing forward from the contact position on the contact member in the front-rear direction due to an impact of contact with the contact member.

According to the driving tool of this aspect, even if the rear end portion of the driver moved rearward by the return mechanism contacts the contact member, the driver rebounds forward from the contact position by the contact member itself. Is prevented. Therefore, compared with the case where the rebound direction is deviated from the operation line while allowing the rebound to the front, the possibility that the driving material is ejected in a manner different from the user's intention can be more reliably reduced. .

In addition, examples of the driving material that can be used with the driving tool of this aspect include nails, scissors, pins, and staples. The driving tool of this aspect can also be called, for example, a nailing machine, a tacker, or a staple gun, corresponding to the driving material used.

The driving tool of this aspect is not particularly limited as long as the electric motor is a driving source and the driver can be moved from the rear position to the front position. Typically, a system in which the flywheel is rotated by a motor and the driver is moved by transmitting the rotational energy to the driver can be suitably employed.

The method of the return mechanism is not particularly limited, but typically, the return mechanism includes a mechanism including an elastic member configured to move the driver backward by the elastic force generated when the driver moves to the front position. Can be adopted.

The material of the contact member is not particularly limited, and for example, rubber, resin, metal or the like can be adopted. Further, the contact member is not necessarily formed as one member, and the contact member may be formed by combining a plurality of members (collectively).

According to one aspect of the present invention, the contact member may have at least one contact surface configured to contact the rear end of the driver. The at least one abutment surface is preferably configured such that the rebound direction of the driver when the driver abuts is directed rearward from the abutment position in the front-rear direction. In other words, the contact surface is preferably arranged so that the advancing direction of the driver after contact is directed rearward from the contact position in the front-rear direction. According to this aspect, the driver can be reliably guided backward by the contact surface. That is, it is possible to more reliably prevent the driver from bouncing forward.

Note that the contact member may have only one contact surface or a plurality of contact surfaces. Further, the contact surface may be a flat surface or a curved surface. The curved surface may be configured to bend in the front-rear direction and / or the up-down direction, or may be a spherical surface in the configuration configured to bend in the front-rear direction and the up-down direction.

According to one aspect of the present invention, the contact member may have at least one contact surface configured to contact the rear end of the driver. The at least one abutment surface may be configured as an inclined surface that inclines toward the rear toward the operation line and has an inclination angle of less than 45 degrees with respect to the operation line. Note that the inclination angle may change within the contact surface. According to this aspect, a typical configuration is provided in which the rebound direction of the driver is directed rearward from the contact position.

According to one aspect of the present invention, the at least one abutment surface may include a pair of abutment surfaces arranged symmetrically across the operation line. According to this aspect, the driver is guided backward while sequentially contacting a pair of contact surfaces arranged symmetrically across the operation line. As a result, the driver can be finally positioned at the rear position in a state where the center line and the operation line of the driver are matched. Note that “arranged in a target manner across the operation line” typically means that the plane including the operation line is arranged symmetrically with respect to the plane of symmetry.

According to one aspect of the present invention, the pair of contact surfaces are inclined in a direction approaching each other toward the rear, and an inclination angle of each of the pair of contact surfaces with respect to each operation line is 15 degrees or less. May be. Thereby, the rebound direction of the driver can be directed backward as much as possible. Thereby, the number of times the driver repeats contact (collision) between the contact surfaces can be reduced, and the driver can be positioned more smoothly at the rear position.

According to one aspect of the present invention, the driver may be arranged such that the long axis of the driver moves on the operation line. A pair of inclined surfaces may be formed at the rear end portion of the driver so as to be symmetrically arranged with respect to the major axis and inclined in a direction approaching each other toward the rear. The inclination angle with respect to the operation line of each of the pair of inclined surfaces may be equal to the inclination angle of each of the pair of contact surfaces. According to this aspect, the wear of the driver can be reduced and the posture of the driver positioned at the rear position can be stabilized.

According to one aspect of the present invention, the driving tool may further include a biasing member that biases the driver toward the rear position. According to this aspect, the positioned driver can be stably held at the rear position by the biasing force of the biasing member.

According to one aspect of the present invention, the contact member may be formed of an elastic material capable of elastic deformation. According to this aspect, the abutting member effectively absorbs the impact when the driver abuts, and the driver can be positioned smoothly at the rear position.

According to one aspect of the present invention, the driving tool may further include a flywheel that is rotationally driven by a motor and stores rotational energy. And a driver may be constituted so that it may move to a front position with rotation energy transmitted from a flywheel.

According to one aspect of the present invention, the return mechanism may include an elastic member, and may be configured to move the driver backward by the elastic force of the elastic member generated in conjunction with the movement of the driver to the front position. Good.

It is explanatory drawing which shows the whole structure of a nailing machine when a driver is arrange | positioned in the initial position. It is explanatory drawing of arrangement | positioning in the initial position of a driver. It is explanatory drawing which shows the whole structure of a nailing machine when a driver is arrange | positioned in a driving position. It is explanatory drawing of arrangement | positioning in the driving position of a driver. It is a disassembled perspective view of a return mechanism. It is a cross-sectional view of a rear side stopper part. It is a front view of a rear side stopper part. It is explanatory drawing of arrangement | positioning of the driver in the middle of moving back from a driving position. It is explanatory drawing of the process in which a driver is positioned to an initial position. It is explanatory drawing of the process in which a driver is positioned to an initial position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, an electric nail driver 1 will be described as an example of a driving tool. The nail driving machine 1 is a tool capable of performing a nail driving operation of driving the nail 101 into a workpiece (for example, wood) 100 by driving the nail 101 linearly.

First, the schematic configuration of the nailing machine 1 will be described with reference to FIG. As shown in FIG. 1, the nail driver 1 is mainly configured by a main body portion 10, a nose portion 12, a handle 13, and a magazine 17.

The main body 10 includes a main body housing 11, a motor 2, a driver 3, a driver drive mechanism 5, and a return mechanism 7. The main body housing 11 forms an outline of the main body 10 and accommodates the driver 3, the driver driving mechanism 5, and the return mechanism 7. The driver 3 drives the nail 101 from the nailing machine 1 by moving linearly along a predetermined operation line L. The driver drive mechanism 5 is a mechanism that moves the driver 3 in the direction of driving out the nail 101 using the motor 2 as a drive source, and the return mechanism 7 moves the driver 3 after driving out the nail 101 toward the original position. It is a mechanism to make. The details of the driver 3, the driver drive mechanism 5, and the return mechanism 7 will be described later. The nose portion 12 is connected to one end of the main body housing 11 in the extending direction of the operation line L (hereinafter simply referred to as the operation line L direction), and passes through the nose portion 12 in the operation line L direction (not shown). Z). One end of the driver passage communicates with the internal space of the main body housing 11, and the other end opens to the outside of the nail driver 1 as an injection port 123 through which the nail 101 is driven.

The handle 13 extends from the center of the main body housing 11 in the direction of the operation line L in a direction intersecting the operation line L. The handle 13 is a part that is gripped by an operator. A trigger 131 that is operated by an operator is provided at a proximal end portion of the handle 13 (an end portion connected to the main body housing 11). A battery mounting portion 15 having terminals and the like is provided at the distal end portion (the end portion opposite to the base end portion) of the handle 13. A rechargeable battery 19 can be attached to and detached from the battery mounting portion 15. Although not shown, the handle 13 includes a trigger switch connected to the trigger 131 and turned on in response to the pulling operation of the trigger 131, a controller for controlling the motor 2 and the driver drive mechanism 5, and the like. Has been placed. The magazine 17 is configured to be able to fill a plurality of nails 101 and is attached to the nose portion 12. The nail 101 filled in the magazine 17 is supplied to the driver passage one by one by a nail feeding mechanism (not shown).

Hereinafter, the detailed configuration of the nailing machine 1 will be described. In the following description, for convenience, the operation line L direction of the driver 3 (left-right direction in FIG. 1) is defined as the front-rear direction of the nail driver 1, and the side where the injection port 123 is provided (right side in FIG. 1). Is defined as the front side of the nailing machine 1, and the opposite side (left side in FIG. 1) as the rear side. A direction (vertical direction in FIG. 1) perpendicular to the direction of the operation line L and corresponding to the extending direction of the handle 13 is defined as the vertical direction of the nail driver 1, and the handle 13 is the main body 10 (main body housing 11). The side (upper side in FIG. 1) connected to the upper side is defined as the upper side, and the side (lower side in FIG. 1) on which the tip end portion (end portion to which the battery 19 is attached) of the handle 13 is disposed is defined as the lower side.

First, the motor 2 as a drive source of the driver 3 will be described. As shown in FIG. 1, the motor 2 as a drive source of the driver 3 has a main body so that the rotation axis of an output shaft (not shown) that rotates with the rotor extends in the left-right direction perpendicular to the operation line L. Arranged in the housing 11. In this embodiment, since the motor 2 is small and has high output, a brushless DC motor is employed. A pulley 21 that rotates integrally with the output shaft is connected to the output shaft of the motor 2.

Next, the driver 3 configured to hit the nail 101 and eject from the ejection port 123 by moving forward from the initial position will be described. As shown in FIG. 2, the driver 3 is formed as a long member, and its long axis (center line in the left-right direction) is located on the operation line L and extends in the front-rear direction of the nail driver 1. It is arranged to exist. In the present embodiment, the driver 3 is formed symmetrically with respect to the long axis (operation line L) (in other words, symmetrical with respect to a plane that includes the long axis and extends in the vertical direction). The driver 3 includes a main body portion 30 that is formed in a generally rectangular thin plate shape as a whole, a striking portion 31 that is formed to have a narrower width in the left-right direction than the main body portion 30, and extends forward from the front end of the main body portion 30. A pair of arm portions 35 projecting left and right from the rear portion of the portion 30.

The rear end portion 32 of the main body portion 30 is a portion that abuts on a rear stopper portion 9 described later and defines the initial position of the driver 3. Note that the left and right side surfaces of the rear end portion 32 are configured as a pair of inclined surfaces 321 that are inclined toward each other toward the rear. As described above, since the driver 3 is formed symmetrically with respect to the long axis, the inclination angles of the pair of inclined surfaces 321 with respect to the long axis (operation line L) are the same. In the present embodiment, the inclination angle of the inclined surface 321 is set to 10 degrees. The front end 310 of the striking portion 31 is a portion that strikes the nail 101. The arm part 35 is a part that regulates forward movement of the driver 3 by abutting against a front stopper part 119 described later. Further, one end of a wire 79 of a return mechanism 7 described later is connected to the arm portion 35.

The driver 3 is held so as to be linearly movable between the initial position and the driving position along the operation line L (in other words, in the longitudinal direction of the nailing machine 1 or in the long axis direction of the driver 3). Has been. Here, the initial position and driving position of the driver 3 will be described with reference to FIGS. In FIG. 1 and FIG. 3, for the sake of easy understanding, as for the driver 3 and the nail 101 to be driven in, the portion arranged in the main body housing 11 is also shown by a solid line. In FIG. 2, the return mechanism 7 is not shown for the sake of clarity.

FIG. 1 and FIG. 2 show a state where the driver 3 is arranged at the initial position. The initial position is a position where the driver 3 is held in a state where the driver driving mechanism 5 is not operated (hereinafter referred to as an initial state). In the present embodiment, the initial position of the driver 3 is set to a position where the rear end portion 32 of the driver 3 abuts on the rear stopper portion 9 disposed at the rear end portion of the main body housing 11 (see FIG. 2). ). Although details will be described later, the rear stopper portion 9 is formed with a pair of contact surfaces 90 corresponding to the pair of inclined surfaces 321 formed at the rear end portion 32 of the driver 3. In the position, the pair of inclined surfaces 321 are held in a stable posture with the pair of contact surfaces 90 in surface contact with each other.

3 and 4 show a state in which the driver 3 is disposed at the driving position. The driving position is a position where the driver 3 moved forward by the driver driving mechanism 5 hits the nail 101 and then drives the nail 101 into the workpiece. In the present embodiment, the driving position of the driver 3 is set to a position where the front end 310 of the driver 3 slightly protrudes from the injection port 123 (see FIG. 3). The driving position of the driver 3 is a position where the front ends of the pair of arm portions 35 of the driver 3 come into contact with the pair of front side stopper portions 119 fixed inside the front end portion of the main body housing 11 from the rear. In other words, in the present embodiment, the initial position and the driving position are the rearmost position and the foremost position that define both ends of the movable range of the driver 3 that moves along the operation line L. You can also. In the present embodiment, the front stopper portion 119 is formed of rubber in order to reduce the impact when the driver 3 collides.

Hereinafter, the driver driving mechanism 5 configured to move the driver 3 forward from the initial position toward the driving position will be described with reference to FIG. As shown in FIG. 1, the driver drive mechanism 5 includes a flywheel 53 and a pressing roller 57.

The flywheel 53 formed in a cylindrical shape is rotatably supported on the front side of the motor 2 in the main body housing 11. The rotational axis of the flywheel 53 extends in the left-right direction orthogonal to the operation line L of the driver 3 in parallel with the rotational axis of the motor 2. A pulley 54 that rotates integrally with the flywheel 53 is connected to a support shaft (not shown) of the flywheel 53. A belt 25 is stretched around the

pulleys

21 and 54. The rotation of the motor 2 is transmitted to the flywheel 53 via the

pulleys

21 and 54 and the belt 25, and the flywheel 53 rotates in the clockwise direction in FIG.

Although not shown in detail, in the present embodiment, a contact arm is provided at the front end portion of the nose portion 12 so as to be able to advance and retreat in the front-rear direction. When the contact arm is pressed against the workpiece 100 and the switch connected to the contact arm is turned on, the motor 2 is driven by the controller (not shown) and the flywheel 53 is rotated.

The pressing roller 57 is configured to move the driver 3 in cooperation with the flywheel 53. The pressing roller 57 is rotatably supported above the flywheel 53. The rotation axis of the pressing roller 57 extends in the left-right direction in parallel with the rotation axis of the flywheel 53. Although not shown in detail, in this embodiment, the pressing roller 57 is between a pressing position where the pressing roller 57 contacts the driver 3 from above and presses the driver 3 against the flywheel 53, and a spaced position where the pressing roller 57 is separated from the driver 3. It can be moved up and down. More specifically, the pressing roller 57 is normally held at the separated position, but when the trigger 131 is pulled while the motor 2 is driven and the switch connected to the trigger 131 is turned on, It is moved from the separation position to the pressing position. At this time, if the flywheel 53 is rotated in the clockwise direction in FIG. 1, the driver 3 held between the flywheel 53 and the pressing roller 57 reaches the driving position against the elastic force of the return spring 71 described later. The nail 101 is struck and ejected from the ejection port 123 to be driven into the workpiece 100.

Hereinafter, the return mechanism 7 configured to move the driver 3 moved to the driving position by the driver driving mechanism 5 backward from the driving position to the initial position will be described with reference to FIGS. 4 and 5. . In FIG. 4, the return spring 71 is not shown for easy understanding.

As shown in FIG. 5, the return mechanism 7 includes a return spring 71, a winding drum 73, a pair of wires 79, a first support member 75, and a second support member 77.

As shown in FIG. 5, the return spring 71 is a torsion coil spring formed by spirally winding a metal wire around a predetermined central axis. The torsion coil spring is a coil spring that receives a torsional moment around the central axis of the coil portion 711. When a load is applied to the spring, a bending stress is generated in the wire.

The take-up drum 73 is configured to hold the return spring 71 and be rotatable about a rotation axis extending coaxially with the central axis of the return spring 71. In the present embodiment, the winding drum 73 includes a main body portion 731, a pair of winding portions 733, and a pair of locking portions 737.

The main body portion 731 is formed in a cylindrical shape, and a return spring 71 is accommodated in the internal space thereof. The pair of winding portions 733 are flange-like portions that protrude radially outward from both end portions of the main body portion 731. The operating end 715 that is one end of the return spring 71 extends from the internal space to the outside, and is locked by a locking groove 735 formed on the outer surface of the one winding portion 733. Yes. A winding groove 734 configured to be capable of winding the wire 79 is formed on the outer peripheral portion of each winding portion 733 over the entire circumference. The pair of locking portions 737 are formed as a pair of protruding portions that protrude radially outward from the outer peripheral surface of the main body portion 731. When the driver 3 reaches the driving position, the pair of locking portions 737 are locked to a rotation stopper portion (not shown) provided on the inner surface side of the rear end portion of the main body housing 11, thereby The drum 73 is restricted from rotating further in the direction in which the wire 79 is drawn out (hereinafter referred to as the drawing direction).

The wire 79 is a metal flexible member that connects the winding drum 73 and the driver 3. As shown in FIG. 4, one end portion of the wire 79 is fixed to the winding groove 734, and the other end portion is fixed to the arm portion 35 of the driver 3.

The first support member 75 and the second support member 77 are configured to rotatably support the winding drum 73 that holds the return spring 71 with respect to the main body housing 11 and to guide the rotation of the winding drum 73. Yes. More specifically, as shown in FIG. 4, the first support member 75 and the second support member 77 are fixed to the left and right sides of the rear end portion of the main body housing 11 with screws, respectively, and have a bottomed cylindrical shape. Both end portions of the take-up drum 73 are rotatably supported from the left and right by the

rotation support portions

751 and 771 formed in the above. The rotating shaft of the winding drum 73 extends in the left-right direction, and the flange-shaped winding portion 733 is disposed symmetrically with respect to the operation line L of the driver 3.

Except for the point that only the first support member 75 has a spring fixing portion 757 configured to fix the fixed end portion (not shown) of the return spring 71, the first support member 75 and the second support member 77 are: It is formed in substantially the same symmetrical shape. The fixed end of the return spring 71 is the end opposite to the operating end 715 (see FIG. 5), and extends from one end of the coil 711 so as to correspond to the diameter of the coil 711. ing. The spring fixing portion 757 is formed as two protruding pieces that protrude rightward from the rotation support portion 751. The fixed end portion of the return spring 71 is sandwiched between the two projecting pieces, so that the fixed end portion is fixed to the first support member 75 and eventually the main body housing 11.

Hereinafter, the rear stopper portion 9 will be described with reference to FIGS. 6 and 7. In the present embodiment, the rear stopper portion 9 contacts the rear end portion 32 of the driver 3 moved rearward by the return mechanism 7 to position the driver 3 at the initial position, and the driver 3 It is configured to prevent it from bouncing forward from the contact position due to an impact at the time of contact with the stopper portion 9.

As shown in FIGS. 6 and 7, the rear stopper portion 9 is disposed along three sides of the rectangular bottom wall portion 91 and four sides that define the outer shape of the bottom wall portion 91, and protrudes upward. And a peripheral wall portion 92. More specifically, the peripheral wall portion 92 corresponds to the rear wall portion 93 corresponding to the rear end side of the bottom wall portion 91, the left end portion and the right end side of the bottom wall portion 91, and the left and right sides of the rear wall portion 93. The left wall portion 94 and the right wall portion 95 are respectively connected. That is, as for the rear side stopper part 9, lower side, rear side, left side, and right side are enclosed by the wall part, and the upper side and the front side are open | released. Note that the open end on the front side of the rear stopper portion 9 constitutes a receiving port 97 of the rear end portion 32 of the driver 3. In the present embodiment, the rear stopper portion 9 is integrally formed of rubber.

In the present embodiment, the rear stopper portion 9 is formed symmetrically on the left and right sides inside the rear end portion of the main body housing 11 so that the center line in the left-right direction is positioned on the operation line L as shown in FIG. It is held fixed. The rear stopper 9 is preferably detachable from the main body housing 11 so that the rear stopper 9 can be replaced when worn. For example, the rear stopper portion 9 may be detachably fitted in a recess formed inside the rear end portion of the main body housing 11.

Of the peripheral wall portion 92, the inner surface (right surface) of the left wall portion 94 and the inner surface (left surface) of the right wall portion 95 are inclined in a direction approaching each other toward the rear. These inclined surfaces are configured as a pair of contact surfaces 90 that contact the rear end portion 32 of the driver 3 when the driver 3 is moved rearward by the return mechanism 7. The pair of abutment surfaces 90 are arranged symmetrically with respect to the operation line L (in other words, plane symmetry with a plane extending in the vertical direction including the operation line L as a symmetry plane). The inclination angle of the contact surface 90 with respect to the operation line L is the same.In this embodiment, the inclination angle of the contact surface 90 is set to 10 degrees, that is, the inclination angle of the contact surface 90 is It is equal to the inclination angle of the inclined surface 321 formed at the rear end portion 32 of the driver 3. The horizontal interval between the pair of contact surfaces 90 is the horizontal direction of the main body portion 30 of the driver 3 at the receiving port 97. It is set slightly larger than the width.

Here, the initial states of the return mechanism 7 and the driver 3 will be described with reference to FIGS. In the return mechanism 7 in the initial state, the wire 79 is wound around the winding portion 733 by one turn in the winding direction of the operating end portion 715 (counterclockwise direction in FIG. 1). The wire 79 extends forward from the lower end of the winding part 733 and is connected to the arm part 35 of the driver 3. The return spring 71 is housed and held in the take-up drum 73 in a state where a fixed end is fixed to the main body housing 11 via the first support member 75 and a load in the winding direction is applied. Has been. Therefore, due to the elastic force of the return spring 71 (see FIG. 5), the winding drum 73 winds the wire 79 around the winding portion 733 in the direction in which the working end 715 is rewound (clockwise direction in FIG. 1). It is biased in the direction of taking (hereinafter referred to as the winding direction).

In the initial state, the driver 3 is urged rearward by the elastic force of the return spring 71 via the wire 79, and the pair of inclined surfaces 321 of the driver 3 are paired with the pair of rear stopper portions 9 as shown in FIG. 2. Each of the contact surfaces 90 is in surface contact with each other and is held in a stable posture at the initial position.

Hereinafter, the operation of the nailing machine 1 will be described. As described above, in the nailing machine 1, the operator pulls the trigger 131 in a state where the contact arm (not shown) of the front end portion of the nose portion 12 is pressed against the workpiece 100, thereby driving the driver driving mechanism. 5 is activated. More specifically, when the motor 2 is driven by a controller (not shown), the flywheel 53 is rotated and the pressing roller 57 is moved to the pressing position. Accordingly, the driver 3 disposed at the initial position shown in FIG. 1 is sandwiched from above and below by the pressing roller 57 and the flywheel 53, and operates toward the driving position against the urging force backward by the return spring 71. It is moved forward along the line L.

In conjunction with the forward movement of the driver 3, the wire 79 connected to the arm portion 35 is pulled forward, whereby the wire 79 is pulled out from the winding portion 733. Accordingly, the winding drum 73 is rotated in the pulling direction (counterclockwise direction in FIG. 1) around the rotation axis against the elastic force of the return spring 71. For this reason, the operating end portion 715 locked in the locking groove 735 of the winding drum 73 is operated in the winding direction, and further elastic force is generated in the return spring 71.

As shown in FIG. 3, the driver 3 strikes the nail 101 and launches it from the injection port 123 to reach the driving position. The front end of the arm portion 35 of the driver 3 abuts against the front stopper portion 119 from the rear, and the locking portion 737 of the winding drum 73 abuts against a rotation stopper portion (not shown), so that the driver 3 moves and winds up. The rotation of the drum 73 is stopped. In this state, when the operator stops the pulling operation of the trigger 131 or releases the pressing of the contact arm against the workpiece 100, the driver drive mechanism 5 stops its operation.

Accordingly, the return mechanism 7 operates to move the driver 3 backward toward the initial position (see FIG. 2) as shown in FIG. More specifically, the take-up drum 73 is rotated in the take-up direction by the elastic force of the return spring 71 generated as the driver 3 moves to the driving position. Along with this, the wire 79 is wound around the winding portion 733, whereby the driver 3 is pulled rearward by the wire 79 and moved rearward.

The pair of wires 79 are fixed to the arm part 35 symmetrically with respect to the operation line L, and pull the arm part 35 substantially parallel to the operation line L. At this time, the rear end portion 32 of the driver 3 may reach the receiving port 97 of the rear stopper portion 9 in a state where the long axis of the driver 3 is slightly shifted from the operation line L. For example, as shown in FIG. 9, when the rear end portion 32 enters the receiving port 97 in the direction of arrow A1 with the long axis of the driver 3 slightly shifted to the left from the operation line L, the rear end portion 32 is Contact (collision) with the left contact surface 90. At this time, the propulsive force of the driver 3 is directed in the direction of the arrow A1, and the driver 3 abuts (collises) against the left abutment surface 90 at the approach angle θ1. In this embodiment, since the inclination angle of the contact surface 90 is set to 10 degrees, the approach angle θ1 when the driver 3 contacts (collises) the contact surface 90 is approximately 10 degrees. Become.

The rebound direction of the driver 3 forms a contact angle 90 and a separation angle θ2 as shown by an arrow A2, and goes backward from the contact position P1. The separation angle θ2 substantially corresponds to the approach angle θ1. Therefore, the driver 3 heads diagonally rightward in the direction of the arrow A2 without being bounced back from the contact position P1. The inclination angle θ3 in the direction of the arrow A2 with respect to the operation line L is (10 + θ2) degrees.

When the driver 3 further proceeds in the direction of the arrow A2 as it is, as shown in FIG. The approach angle θ4 at this time is approximately (20 + θ2) degrees. As in the case of contact (collision) with the left contact surface 90, the rebound direction of the driver 3 forms a separation angle θ5 with the contact surface 90 as shown by an arrow A3, and is rearward from the contact position P2. Head. The separation angle θ5 substantially corresponds to the approach angle θ4. The driver 3 heads diagonally right rearward in the direction of arrow A3 without being bounced back from the contact position P2.

In this way, the driver 3 is guided rearward as a whole while the rear end portion 32 repeatedly makes contact with the pair of contact surfaces 90 arranged symmetrically. As shown in FIG. 2, the driver 3 finally has the long axis of the driver 3 and the operation line L coincident with each other, and the pair of inclined surfaces 321 of the rear end portion 32 are paired with the pair of rear side 7 portions 9. The surface is positioned at the initial position while being in surface contact with the contact surface 90. In the initial position, the rear end of the driver 3 is at a position spaced forward from the rear wall portion 93 of the rear stopper portion 9. The driver 3 is stably held at the initial position while being urged rearward by the return spring 71 via the wire 79. The inclined surface 321 of the driver 3 contributes not only to stabilization of the posture of the driver 3 at the initial position, but also to reducing wear of the driver 3 (or the rear stopper portion 9) due to a collision with the rear stopper portion 9. Yes.

As described above, in the nail driver 1 of the present embodiment, when the rear end portion 32 of the driver 3 moved rearward by the return mechanism 7 contacts the rear stopper portion 9, the rear stopper portion 9 Thus, the driver 3 is prevented from bouncing back further forward than the contact position with the rear stopper portion 9. More specifically, the contact surface 90 is configured such that the rebound direction of the driver 3 when the driver 3 contacts is more backward than the contact position between the driver 3 and the contact surface 90. The driver 3 after contact can be moved rearward (that is, in a direction away from the flywheel 53). Therefore, compared with the case where the rebound direction is deviated from the operation line L while allowing the rebound to the front, the possibility that the nail 101 is ejected in a manner different from the user's intention is more reliably reduced. it can.

In particular, in this embodiment, since the inclination angle of each of the pair of contact surfaces 90 arranged symmetrically with respect to the operation line L is set to a relatively small angle of 10 degrees, one contact surface The driver 3 in contact with 90 is separated from the contact surface 90 with a relatively small separation angle and collides with the other contact surface 90 with a relatively small entry angle. Therefore, the number of times that contact (collision) is repeated between the pair of contact surfaces 90 can be suppressed, and the driver 3 can be positioned more smoothly at the initial position.

In the present embodiment, the rear stopper portion 9 is formed of rubber as an elastic material that can be elastically deformed. Therefore, the rear stopper portion 9 effectively absorbs an impact when the driver 3 comes into contact with the driver 3. It can be positioned smoothly at the initial position.

The correspondence between each component of the above embodiment and each component of the present invention is shown below. The nailing machine 1 is a configuration example corresponding to the “driving tool” of the present invention. The injection port 123 is a configuration example of the “injection port” of the present invention. The nail 101 is a configuration example corresponding to the “driving material” of the present invention. The motor 2 is a configuration example of the “motor” of the present invention. The driver 3 and the pair of inclined surfaces 321 are configuration examples of the “driver” and the “pair of inclined surfaces” of the present invention, respectively. The operation line L, the initial position, and the driving position are configuration examples corresponding to the “operation line”, “rear position”, and “front position” of the present invention, respectively. The return mechanism 7 is a configuration example of the “return mechanism” of the present invention. The rear stopper portion 9 is a configuration example of the “contact member” in the present invention. The pair of contact surfaces 90 is a configuration example of “at least one contact surface” and “a pair of contact surfaces”. The return spring 71 is a configuration example of the “biasing member” of the present invention. The flywheel 5 and the return spring 71 are configuration examples of the “flywheel” and the “elastic member” of the present invention, respectively.

The above embodiment is merely an example, and the driving tool according to the present invention is not limited to the configuration of the illustrated nailing machine 1. For example, the changes exemplified below can be added. Note that only one or a plurality of these changes can be adopted in combination with the nailing machine 1 shown in the embodiment or the invention described in each claim.

The driving tool may be a tool for driving a driving material other than the nail 101. For example, the present invention may be embodied as a tacker or staple gun for ejecting a scissors, pins, staples, or the like. Further, the drive source of the flywheel 53 is not particularly limited to the motor 2. For example, an AC motor may be employed instead of the brushless DC motor.

The driver drive mechanism 5 and the return mechanism 7 only need to be configured to be able to move the driver 3 forward and backward, and can be changed as appropriate. For example, the return mechanism 7 is configured to move the driver 3 backward using the elastic force of the return spring 71 configured by a torsion coil spring. For example, the configuration using the elastic force of a compression coil spring or a tension coil spring is used. It may be adopted. For example, the return mechanism includes a compression coil spring disposed so as to extend in the front-rear direction between the front end face of the arm portion 35 of the driver 3 and the holding portion fixed in the front end portion of the main body housing 11. The driver 3 may be configured to return rearward by the elastic force of a compression coil spring that is compressed as it moves forward.

The rear stopper portion 9 is configured as a single member formed symmetrically with respect to the operation line L. For example, the left side member having one abutting surface 90 and the other abutting surface 90 are configured. You may be comprised with two members of the right side member which has. Further, the rear stopper portion 9 may have only one contact surface that can contact the rear end portion 32 of the driver 3, or three or more contact surfaces. Further, the contact surface is not limited to a flat surface, and may be a curved surface. For example, the rear stopper portion 9 may be configured to include a conical concave portion whose diameter decreases toward the rear with the operation line L as an axis, and the inner surface of the concave portion may be a contact surface.

The contact surface only needs to be configured such that the rebound direction of the driver 3 is directed rearward from the contact position, and the inclination angle may be set to an angle other than 10 degrees. From this point of view, the inclination angle of the contact surface only needs to be smaller than 45 degrees. In addition, since the driver 3 can be positioned more smoothly at the initial position as the angle is smaller, the inclination angle of the contact surface is preferably 15 degrees or less.

The rear stopper portion 9 is preferably formed of an elastic material from the viewpoint of effectively absorbing the impact when the driver 3 abuts, but is formed of a material other than the elastic material such as metal or resin. It may be. Moreover, only the part which forms a contact surface among the rear side stopper parts 9 may be formed with an elastic material, and the other part may be formed with another material.

Furthermore, in view of the gist of the present invention and the above embodiment, the following configuration (mode) is constructed. Only one or a plurality of the following configurations may be employed in combination with the nailing machine 1 shown in the embodiment or the invention described in each claim.

[Aspect 1]
The contact member has at least one contact surface configured to contact the rear end portion of the driver;
Each of the at least one contact surfaces may be configured as an inclined surface that is inclined in a direction approaching the operation line toward the rear and has an inclination angle with respect to the operation line of less than 45 degrees.
[Aspect 2]
A flywheel that is rotationally driven by the motor and stores rotational energy;
The driver may be configured to move to the striking position by the rotational energy transmitted from the flywheel.
[Aspect 3]
A driving tool according to aspect 2,
The return mechanism may include an elastic member, and may be configured to move the driver backward by an elastic force of the elastic member generated in conjunction with the movement of the driver to the front position.

1: nailing machine, 10: main body part, 11: main body housing, 119: front side stopper part, 12: nose part, 123: injection port, 13: handle, 131: trigger, 15: battery mounting part, 17: magazine, 19: battery, 2: motor, 21: pulley, 25: belt, 3: driver, 30: main body, 31: striking part, 310: front end, 32: rear end, 321: inclined surface, 35: arm part, 5: Driver drive mechanism, 53: Flywheel, 54: Pulley, 57: Press roller, 7: Return mechanism, 71: Return spring, 711: Coil part, 715: Working end, 73: Winding drum, 731: Main body Part, 733: winding part, 734: winding groove, 735: locking groove, 737: locking part, 75: first support member, 751: rotation support part, 757: spring fixing part, 77: second support Member 771 Rotation support part, 79: wire, 9: rear side stopper part, 90: contact surface, 91: bottom wall part, 92: peripheral wall part, 93: rear wall part, 94: left wall part, 95: right wall part, 97: receiving port, 100: workpiece, 101: nail, L: operation line, P1, P2: contact position, θ1, θ4: approach angle, θ2, θ5: separation angle

Claims

An electric driving tool configured to inject the driving material into the workpiece by injecting the driving material from the injection port,
A motor,
A predetermined movement line extending in the front-rear direction of the driving tool is held so as to be movable between a rear position and a front position ahead of the rear position. A driver configured to hit the driven material and eject from the injection port by moving from a rear position to the front position;
A return mechanism configured to move the driver backward from the front position toward the rear position;
A contact member configured to position the driver at the rear position by contacting the rear end of the driver moved rearward by the return mechanism;
The contact member is configured to prevent the driver from rebounding forward in the front-rear direction from the contact position with respect to the contact member due to an impact of contact with the contact member. A driving tool characterized by that.
The driving tool according to claim 1,
The contact member has at least one contact surface configured to contact the rear end portion of the driver;
Each of the at least one contact surfaces is configured such that a rebound direction of the driver when the driver contacts is directed rearward from the contact position in the front-rear direction. The driving tool according to claim 1.
The driving tool according to claim 1,
The contact member has at least one contact surface configured to contact the rear end portion of the driver;
Each of the at least one abutment surfaces is configured as an inclined surface that inclines toward the rear toward the operation line and has an inclination angle of less than 45 degrees with respect to the operation line. Driving tool.
The driving tool according to claim 1 or 2,
The driving tool according to claim 1, wherein the at least one contact surface includes a pair of contact surfaces arranged symmetrically with respect to the operation line.
The driving tool according to claim 4,
The pair of contact surfaces are inclined in a direction approaching each other toward the rear,
The driving tool characterized in that an inclination angle of each of the pair of contact surfaces with respect to the operation line is 15 degrees or less.
The driving tool according to claim 5,
The driver is arranged such that the long axis of the driver moves on the operation line,
A pair of inclined surfaces are formed at the rear end of the driver symmetrically with respect to the major axis, and are inclined in a direction approaching each other toward the rear,
A driving tool characterized in that an inclination angle of each of the pair of inclined surfaces with respect to the operation line is equal to the inclination angle of each of the pair of contact surfaces.
A driving tool according to any one of claims 1 to 6,
The driving tool further comprising an urging member that urges the driver toward the rear position.
The driving tool according to any one of claims 1 to 6,
The abutting member is formed of an elastic material that can be elastically deformed.
The driving tool according to any one of claims 1 to 8,
A flywheel that is rotationally driven by the motor and stores rotational energy;
The driving tool is configured to move to the front position by the rotational energy transmitted from the flywheel.
A driving tool according to claim 9,
The return mechanism includes an elastic member, and is configured to move the driver backward by the elastic force of the elastic member generated in conjunction with the movement of the driver to the front position. Driving tool.