Fastening tools

Abstract

The present invention provides a fastening tool. The fastening tool (1) has a motor (21), a ball screw mechanism (4), a tool body (10) and a handle (17). The motor has a motor body and a motor shaft. The ball screw mechanism uses the power of the motor to pull the pin (81) of the fastener (8) backward along the drive axis (A1) relative to the collar (85), thereby fastening the work object (W) through the fastener. The tool body accommodates the motor and the ball screw mechanism. The handle extends in a direction intersecting the drive axis and is connected to the tool body in a manner that forms an annular portion together with the tool body. The rotation axis (A2) of the motor shaft extends parallel to the drive axis. A portion of the handle is arranged in the rear area of ​​the motor body. Based on this, a technology that helps to improve the operability of a fastening tool that fastens a work object through a fastener and improve the power transmission efficiency is provided.

Description

Technical Field

[0001] The present invention relates to a fastening tool configured to fasten a work object (workpiece) by a fastener. Background Art

[0002] There is known an electric fastening tool which is configured to fasten a work object by a fastener having a rod-shaped pin and a cylindrical portion through which the pin is inserted. For example, the fastening tool disclosed in Patent Document 1 has a ball screw mechanism driven by the power of a motor. The ball screw mechanism is configured to fasten the work object by pulling the pin axially relative to the cylindrical portion to deform the fastener.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] Patent Document 1: Japanese Patent Publication No. 2018-118294 Summary of the invention

[0006] [Technical Problems to be Solved by the Invention]

[0007] In the above-mentioned fastening tool, the motor is arranged in the outer housing downwardly away from the ball screw mechanism and is located below the handle, and the rotation axis of the motor shaft extends in a direction intersecting with the axis when the ball screw mechanism moves the pin. Therefore, an intermediate shaft for transmitting power is provided between the motor and the ball screw mechanism. Due to such a structure, the above-mentioned fastening tool has room for further improvement in operability and power transmission.

[0008] An object of the present invention is to provide a technology that contributes to improving the operability of a fastening tool for fastening a work object with a fastener and improving the power transmission efficiency.

[0009] [Technical solutions for solving technical problems]

[0010] According to one technical solution of the present invention, there is provided a fastening tool for fastening a work object by a fastener having a pin and a cylindrical portion. The fastening tool has a motor, a fastening mechanism, a tool body and a main handle.

[0011] The motor has a motor body and a motor shaft. The motor body includes a stator and a rotor. The motor shaft is extended from the rotor and is configured to rotate integrally with the rotor. The fastening mechanism is configured to pull the pin backward relative to the cylindrical portion along the drive axis that specifies the front-rear direction of the fastening tool through the power of the motor, thereby fastening the work object through the fastener. The tool body accommodates the motor and the fastening mechanism. The main handle is elongated and extends in a direction that intersects the drive axis. The main handle is connected to the tool body in a manner that forms an annular portion together with the tool body. The rotation axis of the motor shaft extends parallel to the drive axis. A portion of the main handle is arranged in the rear area of ​​the motor body. That is, when the motor body is observed from the rear side, a portion of the main handle overlaps with the area occupied by the motor body (the area closer to the inner side than the outer periphery of the motor body). In addition, the "rear area of ​​the motor body" can also be an area obtained by projecting the motor body backward.

[0012] In the fastening tool of the present technical solution, the motor and the fastening mechanism are arranged so that the rotation axis of the motor shaft is parallel to the drive axis of the fastening mechanism. Therefore, compared with the case where the rotation axis of the motor shaft and the drive axis extend in directions intersecting each other, it is easy to arrange the motor and the fastening mechanism close to each other, thereby enabling efficient power transmission. Moreover, since a part of the main handle is arranged in the rear area of ​​the motor, the user can hold the main handle at a position relatively close to the drive shaft, thereby improving operability.

[0013] In a technical solution of the present invention, the fastening tool may have a first operating component that can be externally operated by a user to start the motor. In addition, the first operating component may be provided on the main handle and disposed on the rotating shaft of the motor shaft. By disposing such a first operating component, the user's hand can be reliably guided to the portion of the main handle disposed in the rear area of ​​the motor body, thereby helping to improve operability.

[0014] In a technical solution of the present invention, the tool body may include a first part and a second part, wherein the first part accommodates a motor and a fastening mechanism, and the second part is configured to hold the battery in a manner that the battery can be removed. Furthermore, the first part, the second part and the main handle may form at least a part of the annular portion. Furthermore, in the present technical solution, the two ends of the main handle may be connected to the first part and the second part of the tool body, respectively. The tool body may include a third part, which is separated from the main handle at the front side of the main handle and extends in a direction intersecting the drive axis, and connects the first part and the second part. Furthermore, the first part, the second part, the third part and the main handle may form an annular portion. According to the present technical solution, a reasonable configuration of the tool body and the main handle that can detach and install the battery can be achieved.

[0015] In a technical solution of the present invention, the fastening tool may further include a second operating component, which can be externally operated by a user for information input. Furthermore, the second operating component may be disposed on the third portion in a manner facing the main handle. According to this technical solution, the user can place the second operating component in a position that is easy to operate from the rear side while holding the main handle.

[0016] In one technical solution of the present invention, the fastening tool may further include a controller configured to control the movement of the fastening tool. Furthermore, the controller may be accommodated in the third part. According to this technical solution, the interior of the third part connecting the first part as the accommodating part of the motor and the fastening mechanism and the second part as the retaining part of the battery can be effectively and reasonably utilized to configure the controller, thereby facilitating the wiring with the motor and the battery. In addition, in this technical solution, the controller may have a length, a width and a thickness, among which the length is the largest, and the controller is configured such that its length direction is inclined relative to the drive axis. According to this technical solution, the controller can be reasonably configured while suppressing the enlargement of the third part.

[0017] In a technical solution of the present invention, the fastening tool may also have a battery holder, which has a first engaging portion that can be physically engaged with the second engaging portion of the battery, and a first terminal that can be electrically connected to the second terminal of the battery. In addition, the battery holder can be held in the second portion via an elastic component. According to this technical solution, when the battery is impacted, the possibility of battery damage can be reduced by moving the battery holder relative to the tool body.

[0018] In one technical solution of the present invention, the tool body may have a mounting portion, and the mounting portion can be mounted with an auxiliary handle held by a user. According to this technical solution, the user mounts the auxiliary handle on the mounting portion as needed, and holds the main handle and the auxiliary handle with both hands, thereby being able to hold the tightening tool more stably.

[0019] In a technical solution of the present invention, the fastening tool may also have a snap-fitting component, which is configured to be snap-fitted with the hanging component and installed on the tool body, wherein the hanging component and the fastening component are provided separately. In addition, the tool body may be configured to be able to change the installation position of the snap-fitting component. According to this technical solution, the user can reduce the burden of continuously maintaining the fastening tool in the same posture by, for example, snapping the hanging component with the snap-fitting component and hanging the fastening tool from above. In addition, the user can appropriately change the installation position of the snap-fitting component according to the actual use posture of the fastening tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a fastening tool.

[0021] Figure 2 is a perspective view of a fastening tool with an auxiliary handle installed.

[0022] Figure 3 is a cross-sectional view of the auxiliary handle.

[0023] Figure 4 yes Figure 1 A partial enlarged view of .

[0024] Figure 5 It is an explanatory diagram of the hook after changing the mounting position.

[0025] Figure 6 is a rear view of the fastening tool.

[0026] Figure 7 yes Figure 1 A partial enlarged view of .

[0027] Figure 8 This is a perspective view of the fastening tool with the outer case removed.

[0028] Fig. 9 yes Figure 1 A partial enlarged view of .

[0029] Fig.10 yes Figure 6 Cross-sectional view of XX.

[0030] Fig.11 It is a perspective view of the fastening tool in a state where the battery holder and the elastic member are disassembled.

[0031] Fig.12 yes Figure 1 Cross-sectional view of XI I-XI I.

[0032] Fig.13 This is a diagram for explaining the fastening process.

[0033] Fig.14 This is a diagram for explaining the fastening process.

[0034] Fig.15 This is a diagram for explaining the fastening process.

[0035] Fig.16 yes Fig.15 A partial enlarged view of .

[0036] Fig.17 This is a diagram for explaining the fastening process.

[0037] [Explanation of Reference Numerals]

[0038] 1: Fastening tool; 10: Tool body; 101: Accommodation portion; 103: Extension portion; 104: Front wall; 105: Rear wall; 106: Battery holding portion; 107: Bottom wall; 108: Protrusion; 109: Flange portion; 11: Front housing; 111: Mounting portion; 12: Central housing; 121: Rear wall; 13: Rear housing; 131: Guide member; 133: Flange portion; 14: External housing; 141: Upper wall; 143: Plate; 144: Threaded hole; 145: Hook; 146: Through hole; 147: Screw; 148: opening; 149: cover; 15: battery holder; 150: elastic member; 151: upper wall; 153: peripheral wall; 155: guide rail; 157: terminal block; 16: machine head; 17: handle; 171: trigger; 172: switch; 19: screw; 20: controller; 21: motor; 211: motor body; 213: motor shaft; 23: operation display; 231: operation unit; 233: display unit; 27: position sensor; 271: magnet; 3: drive mechanism; 31: planetary reduction device; 32: first intermediate shaft; 321: driving gear; 33: second intermediate shaft; 331: idler gear; 4: ball screw mechanism; 41: nut; 411: driven gear; 412: gear teeth; 421: bearing; 422: bearing; 45: screw; 450: driving shaft; 451: extension shaft; 455: bearing; 51: front side bearing portion; 511: thrust bearing; 53: rear side bearing portion; 54: bearing member; 541: main body; 543: connecting portion; 55: thrust bearing; 56: elastic member; 62: anvil; 621: hole; 63: connecting sleeve; 65: pin holding portion; 651: base; 653: holding claw; 654: front end portion; 66: connecting component; 8: fastener; 81: pin; 811: shaft; 815: head; 85: collar; 851: flange; 91: auxiliary handle; 911: holding portion; 913: abutment portion; 915: belt; 916: bolt; 93: battery; 931: snap-fit ​​groove; 933: terminal portion; 935: hook; A1: drive axis; A2: rotating axis; W: working object. DETAILED DESCRIPTION

[0039] Hereinafter, a fastening tool 1 according to an embodiment will be described with reference to the drawings. The fastening tool 1 is an electric fastening tool capable of fastening a work object using a fastener.

[0040] In addition, the fastening tool 1 can selectively use a variety of fasteners, but in the following description, the example Figure 1 The fastener 8 shown is an example of a well-known fastener called a multi-piece swage type fastener. The fastener 8 is composed of a pin 81 and a collar 85.

[0041] The pin 81 includes a shaft portion 811 and a head portion 815 integrally formed at one end of the shaft portion 811. The collar 85 is a cylindrical component into which the shaft portion 811 can be inserted. A flange 851 is provided at one end of the collar 85. The pin 81 and the collar 85 are originally formed separately from each other. The collar 85 is deformed by pulling the pin 81 axially relative to the collar 85 by the fastening tool 1, and the work object W is fastened by the head portion 815 of the pin 81 and the collar 85 riveted to the shaft portion 811 of the pin 81.

[0042] In addition, among the multi-component rivet-type fasteners, there are types in which a part of the shaft portion of the pin (also referred to as a pin tail or a mandrel) is broken and pulled apart (hereinafter, also referred to as a breaking type) and types in which the shaft portion of the pin is not broken but remains intact (hereinafter, also referred to as a non-breaking type). Fastener 8 is a non-breaking type.

[0043] Next, the schematic structure of the fastening tool 1 will be described.

[0044] like Figure 1 and Figure 2 As shown, the outer contour of the fastening tool 1 is mainly formed by the tool body 10, the handle 17 and the head 16. The tool body 10 accommodates the motor 21, the drive mechanism 3, etc. The battery 93 can be installed on the tool body 10, and the fastening tool 1 is operated by the power supplied from the battery 93. The handle 17 is a long cylindrical body for the user to hold. Both ends of the handle 17 are connected to the tool body 10, and the tool body 10 and the handle 17 form a roughly D-shaped annular portion (ring) as a whole. The head 16 is connected to the tool body 10 in a manner extending along a specified drive axis A1. The handle 17 is arranged on the side opposite to the head 16 in the extension direction of the drive axis A1, and extends in a direction intersecting the drive axis A1 (in detail, a direction roughly orthogonal), and the handle 17 has a trigger 171 that is pulled (pressed) by the user.

[0045] When the user engages the fastener 8 with the top end of the handpiece 16 and pulls the operating trigger 171, the motor 21 is driven. The driving mechanism 3 uses the power of the motor 21 to pull the pin 81 backward relative to the collar 85 to deform the fastener 8, thereby fastening the work object W.

[0046] Next, regarding the direction of the fastening tool 1, for the sake of convenience, the extension direction of the drive axis A1 is defined as the front-to-back direction of the fastening tool 1. In the front-to-back direction, the side where the machine head 16 is arranged is defined as the front side, and the opposite side (the side where the handle 17 is arranged) is defined as the rear side. In addition, the direction orthogonal to the drive axis A1 and corresponding to the long axis direction of the handle 17 is defined as the up-down direction. In the up-down direction, the end side of the handle 17 close to the drive axis A1 is defined as the upper side, and the opposite side (the end side away from the drive axis A1) is defined as the lower side. In addition, the direction orthogonal to the front-to-back direction and the up-down direction is defined as the left-right direction.

[0047] Next, the detailed structure of the fastening tool 1 will be described.

[0048] First, the structures of the tool body 10 and the handle 17 will be described.

[0049] like Figure 1 and Figure 2 As shown, the tool body 10 is formed by connecting a front housing 11 , a center housing 12 , a rear housing 13 , and an outer housing 14 .

[0050] The front housing 11 is a hollow body including a cylindrical front portion and a rectangular box-shaped rear portion opened toward the rear. The central housing 12 is a substantially rectangular support body corresponding to the rear portion of the front housing 11, and is disposed at the rear side of the front housing 11. The rear housing 13 is a cylindrical body extending in the front-to-rear direction, and has a rectangular flange portion 133 protruding radially outward from the front end portion. The rear housing 13 is disposed at the rear side of the upper portion of the central housing 12. The front housing 11, the central housing 12, and the rear housing 13 are connected and integrated in the front-to-rear direction, and mainly function as a support portion that supports the nut 41 described later in a rotatable manner. The front housing 11, the central housing 12, and the rear housing 13 are made of metal (more specifically, made of aluminum alloy). In addition, the details of the connection structure of the front housing 11, the central housing 12, and the rear housing 13 will be described later.

[0051] On the other hand, the outer shell 14 is formed by connecting two halves that are divided in the left-right direction. In more detail, the two halves are connected by a plurality of screws (not shown) in a state where the upper portions of the front shell 11 and the central shell 12 are exposed to the outside and the lower portions of the front shell 11 and the central shell 12 and the rear shell 13 are clamped. Accordingly, the outer shell 14 is integrated with the front shell 11, the intermediate shell 12, and the rear shell 13. In this way, in the present embodiment, the tool body 10 as an integrated housing body is constituted by the front shell 11, the central shell 12, the rear shell 13, and the outer shell 14. In addition, the outer shell 14 is made of synthetic resin.

[0052] In addition, the tool body 10 includes a housing portion 101 , an extending portion 103 , and a battery holding portion 106 .

[0053] The housing portion 101 is a portion of the tool body 10 for housing the motor 21 and the drive mechanism 3. The upper portion of the housing portion 101 extends along the drive axis A1. The length of the upper portion of the housing portion 101 in the front-to-back direction is longer than the length of the lower portion in the front-to-back direction, and the rear end of the upper portion of the housing portion 101 protrudes rearward than the rear end of the lower portion. The housing portion 101 is composed of the above-mentioned front housing 11, the central housing 12, the rear housing 13, and a part of the outer housing 14.

[0054] The front end portion of the upper part of the housing 101 (the cylindrical portion of the front housing 11 exposed to the outside from the outer housing 14) is a portion for the connection sleeve 63 described later to be screwed together, and is configured as an internal thread portion. In addition, this portion is configured to be able to mount the auxiliary handle 91 (see Figure 2 )'s mounting portion 111.

[0055] The auxiliary handle 91 is a well-known handle that can be installed on the working tool by the user as needed, and can be used as an auxiliary handle in addition to the handle 17 as the main handle. Figure 2 and Figure 3 As shown, the auxiliary handle 91 includes a gripping portion 911, an abutting portion 913 and a belt 915. The gripping portion 911 is an elongated portion for the user to grip. The protruding end of the abutting portion 913 has a semicircular cross-section. The belt 915 is formed in an annular shape and is connected to the gripping portion 911 via a bolt 916. The user inserts the mounting portion 111 into the annular space formed by the protruding end of the abutting portion 913 and the belt 915, and rotates the gripping portion 911 relative to the abutting portion 913 around its long axis, thereby tightening the belt 915, thereby mounting the auxiliary handle 91 on the working tool. Therefore, the diameter of the mounting portion 111 is set in a manner such that the outer periphery of the mounting portion 111 is along the protruding end of the abutting portion 913. In addition, the length of the mounting portion 111 in the front-to-back direction is set in a manner corresponding to the width of the belt 915.

[0056] In addition, a hook 145 is installed on the upper wall 141 (upper wall of the outer housing 14) of the storage portion 101 in order to be able to hang and use the fastening tool 1. The hook 145 is a plate-like member bent into a U shape and is installed on the upper wall 141 by a screw 147. In this embodiment, the storage portion 101 is configured so that the installation position of the hook 145 can be changed.

[0057] Specifically, if Figure 4As shown, a metal plate 143 is fixed to the lower side of the upper wall 141. The plate 143 has five threaded holes 144 arranged at equal intervals along the center line in the left-right direction. Five through holes are provided on the upper wall 141, and the five through holes are located at positions aligned with the threaded holes 144. On the other hand, through holes 146 are provided at both ends of the hook 145. The interval between the through holes 146 of the hook 145 is equal to the interval between the two threaded holes 144 at both ends of the three adjacent threaded holes 144. Therefore, there are three possible installation positions for the hook 145. The user removes the hook 145 by removing the screw 147, for example, Figure 5 As shown, the through hole 146 of the hook 145 is aligned with the other threaded holes 144 at the same position and the screw 147 is tightened, so that the installation position of the hook 145 can be easily changed.

[0058] like Figure 1 and Figure 2 As shown in the figure, the extension part 103 is a hollow part of the tool body 10 that protrudes from the lower end of the housing part 101 and extends in a direction intersecting the drive axis A1. More specifically, the extension part 103 as a whole extends obliquely from just below the lower rear end of the housing part 101 (the housing area of ​​the motor 21) to the rear and lower direction. The extension part 103 is composed of a part of the outer shell 14, including a pair of left and right side walls, a front wall 104 and a rear wall 105.

[0059] The battery holding portion 106 is a portion of the tool body 10 that extends rearward from the lower end of the extension portion 103. The battery holding portion 106 is formed by a portion of the outer shell 14. The battery holding portion 106 is configured to hold the battery 93 in a manner that allows the battery 93 to be removed. In the present embodiment, a battery holding frame 15 is elastically connected to the battery holding portion 106, and the battery 93 is held in the battery holding portion 106 via the battery holding frame 15. The battery holding frame 15 will be described in detail later.

[0060] As mentioned above, the handle 17 is an elongated cylindrical body. Figure 1 , Figure 2 and Figure 6 As shown, the upper end of the handle 17 is connected to the rear end of the upper part of the accommodating portion 101 (i.e., the part that protrudes rearward than the rear end of the lower part of the accommodating portion 101). The lower end of the handle 17 is connected to the rear end of the battery retaining portion 106. Therefore, the handle 17 is separated from the lower part of the accommodating portion 101 and the extension portion 103 to the rear and extends in the up and down direction. In addition, in the present embodiment, the handle 17 is made of synthetic resin and is formed by connecting the left and right halves to each other with screws. The left and right halves of the handle 17 are respectively formed integrally with the left and right halves of the external shell 14.

[0061] According to the above structure, the accommodating portion 101 extending in the front-to-back direction, the extending portion 103 extending obliquely rearward and downward from the lower end of the accommodating portion 101, the battery retaining portion 106 extending rearward from the lower end of the extending portion 103, and the handle 17 form an annular portion (ring), wherein both ends of the handle 17 are connected to the upper rear end of the accommodating portion 101 and the rear end of the battery retaining portion 106.

[0062] Next, the internal structure of the tool body 10 (the housing portion 101 , the battery holding portion 106 , and the extending portion 103 ) will be described in order.

[0063] First, the internal structure of the housing section 101 will be described.

[0064] like Figure 7 As shown, a motor 21 and a drive mechanism 3 are accommodated in the housing portion 101. The motor 21 is accommodated in the rear end portion of the lower portion of the housing portion 101. In the present embodiment, the motor 21 is a brushless DC motor. The motor 21 includes a motor body 211 and a motor shaft 213, wherein the motor body 211 includes a stator and a rotor, and the motor shaft 213 extends from the rotor and rotates integrally with the rotor. The rotation axis A2 of the motor shaft 213 extends parallel to the drive axis A1 (i.e., in the front-to-back direction) at the lower side of the drive axis A1.

[0065] The drive mechanism 3 is a mechanism configured to move the pin 81 of the fastener 8 relative to the collar 85 in the front-rear direction by the power of the motor 21. More specifically, the drive mechanism 3 is configured to move the pin holding portion 65 relative to the anvil 62 connected to the tool body 10 along the drive axis A1, wherein the pin holding portion 65 is configured to hold the pin 81. The drive mechanism 3 of this embodiment includes a planetary reducer 31, a drive gear 321 provided on the first intermediate shaft 32, an idler gear 331 provided on the second intermediate shaft 33, and a ball screw mechanism 4.

[0066] The planetary reducer 31 is arranged in the lower part of the housing portion 101 in a coaxial manner with the motor 21 on the front side of the motor 21. The planetary reducer 31 is a reducer using a planetary gear mechanism, and is configured to increase the torque input from the motor shaft 213 and output the increased torque to the first intermediate shaft 32. In the present embodiment, the planetary reducer 31 is configured as a three-stage planetary reducer including three sets of planetary gear mechanisms. In addition, since the structure of the planetary gear mechanism itself is well known, a detailed description is omitted here.

[0067] The first intermediate shaft 32 extends forward from the planetary reducer 31 along the rotation axis A2 in the tool body 10. The first intermediate shaft 32 is rotatably supported by two bearings respectively held on the front housing 11 and the center housing 12. The first intermediate shaft 32 is connected to the planetary carrier of the third-stage planetary gear mechanism of the planetary reducer 31, and rotates integrally with the planetary carrier around the rotation axis A2. The drive gear 321 is integrally provided on the outer periphery of the first intermediate shaft 32.

[0068] The second intermediate shaft 33 extends parallel to the first intermediate shaft 32 on the upper side of the first intermediate shaft 32. The front end and the rear end of the second intermediate shaft 33 are respectively fitted and supported in support holes formed in the front housing 11 and the center housing 12. The idler gear 331 is supported by the second intermediate shaft 33 through a bearing and is rotatable relative to the second intermediate shaft 33. The idler gear 331 meshes with the drive gear 321 and the driven gear 411 of the nut 41 described later, but does not affect the rotation speed ratio (gear ratio) of the two.

[0069] The ball screw mechanism 4 is mainly composed of a nut 41 and a screw 45. In the present embodiment, the ball screw mechanism 4 is configured to convert the rotational motion of the nut 41 into the linear motion of the screw 45, and to linearly move a pin holding portion 65 described later.

[0070] The nut 41 is an elongated cylindrical member and is supported on the tool body 10 in a state where the movement in the front-rear direction is restricted and the nut 41 can rotate around the drive axis A1. More specifically, the front end and the rear end of the nut 41 are rotatably supported by a bearing 421 and a bearing 422, respectively, wherein the bearing 421 is held by the front housing 11 and the bearing 422 is held by the rear housing 13. Both the bearing 421 and the bearing 422 are radial bearings.

[0071] In addition, a driven gear 411 is provided on the nut 41. The driven gear 411 is a flange-shaped portion protruding radially outward from the outer peripheral surface of the nut 41, and has gear teeth 412 on its outer periphery. The driven gear 411 is formed integrally with the nut 41. The driven gear 411 is arranged between the bearing 421 and the bearing 422. In more detail, the driven gear 411 is arranged at a position closer to the front side than the center position of the nut 41 in the axial direction (front-to-back direction). Therefore, the portion of the nut 41 that is closer to the rear side than the driven gear 411 is longer, and in the front-to-back direction, the space between the bearing 422 on the rear side and the driven gear 411 is larger than the space between the bearing 421 on the front side and the driven gear 411.

[0072] The screw 45 is engaged with the nut 41 in a state where the rotation around the drive axis A1 is restricted and the screw 45 can move in the front-rear direction along the drive axis A1. More specifically, the screw 45 is configured as an elongated body and is inserted into the nut 41 in a manner extending along the drive axis A1. Although detailed illustrations are omitted, the spiral track is defined by grooves formed on the inner circumference of the nut 41 and the outer circumference of the screw 45. A plurality of balls are arranged in a rollable manner in the track. The screw 45 is engaged with the nut 41 via these balls.

[0073] like Figure 8 As shown, a pair of arms extending from the screw 45 to the left and right are provided at the rear end of the screw 45. A bearing 455 is mounted at the top end of each arm. On the other hand, a pair of left and right guide members 131 are fixed to the tool body 10 (specifically, the rear housing 13). The bearing 455 is arranged in the guide groove of the guide member 131. With such a structure, when the nut 41 rotates around the drive axis A1, the screw 45 moves linearly in the front-rear direction relative to the nut 41 and the tool body 10.

[0074] In addition, if Figure 7 As shown, an extension shaft 451 is coaxially connected and fixed to the rear end of the screw 45 and is integrated with the screw 45. The integrated screw 45 and the extension shaft 451 are also collectively referred to as a drive shaft 450 below.

[0075] Although detailed description is omitted, the fastening tool 1 of the present embodiment is realized by replacing the anvil 62 and the pin holding portion 65 (see Figure 1 ), not only can the above-mentioned non-breaking type fastener 8 be fastened, but also the work object using the breaking type fastener can be fastened. Figure 1 As shown, the drive shaft 450 has a through hole that penetrates the drive shaft 450 along the drive axis A1, which serves as a passage for recovering the pin tail separated from the break-type fastener. An opening 148 having a circular cross section is formed on the rear wall of the upper part of the receiving portion 101. When a non-break-type fastener 8 is used, an end cap 149 that covers the opening 148 is detachably mounted on the rear wall of the upper part of the receiving portion 101. On the other hand, although detailed description and illustration are omitted, when a break-type fastener is used, a container that can accommodate the pin tail may be installed instead of the end cap 149.

[0076] During the tightening process, when the screw 45 moves in the front-to-back direction relative to the nut 41, a strong axial force (also called thrust load) acts as a reaction force on the nut 41 in the extension direction (front-to-back direction) of the drive axis A1. Figure 7As shown, a front bearing portion 51 is provided on the front side of the nut 41 in the front-to-rear direction, and the front bearing portion 51 is used to bear the reaction force acting on the nut 41 in the forward and backward direction. In addition, a rear bearing portion 53 is provided in the space between the bearing 422 on the rear side and the driven gear 411, and the rear bearing portion 53 is used to bear the reaction force acting on the nut 41 in the backward direction.

[0077] The front bearing portion 51 is composed of a thrust bearing 511, which is arranged between the rear end face of the connecting sleeve 63 connected to the tool body 10 and the front end face of the nut 41 in the front-rear direction. In more detail, the thrust bearing 511 includes two rings and a plurality of rolling elements arranged between the rings, and the two rings are arranged in a manner of abutting against the rear end face of the connecting sleeve 63 and the front end face of the nut 41. With such an arrangement, the thrust bearing 511 allows the nut 41 to rotate smoothly during the tightening process, while bearing the reaction force from the nut 41 toward the front generated by the movement of the screw 45 toward the rear, and transmits the reaction force to the connecting sleeve 63.

[0078] On the other hand, Fig. 9 As shown, the rear side bearing portion 53 is arranged on the rear side of the rear end surface of the driven gear 411 in the front-to-rear direction. In this embodiment, the rear side bearing portion 53 includes a bearing component 54, a thrust bearing 55 and an elastic component 56, wherein the thrust bearing 55 is arranged between the driven gear 411 and the bearing component 54, and the elastic component 56 is sandwiched between the thrust bearing 55 and the bearing component 54.

[0079] The bearing member 54 is a member for bearing the reaction force from the nut 41 toward the rear via the rear end face of the driven gear 411 during the tightening process. The reaction force is generated as the screw 45 moves toward the front, and the bearing member 54 is arranged on the rear side of the rear end face of the driven gear 411. In addition, the rear end of the bearing member 54 is located in front of the rear end of the nut 41 (in more detail, in front of the bearing 422). The bearing member 54 is made of metal. In this embodiment, in order to ensure sufficient strength, the bearing member 54 is formed of iron (or an alloy with iron as a main component).

[0080] like Figure 8 to Figure 10 As shown, the receiving member 54 is fixed to the front housing 11 in the tool body 10 by a plurality of screws 19. More specifically, the receiving member 54 includes a cylindrical main body 541 and a rectangular plate-shaped connecting portion 543 protruding radially outward from the main body 541.

[0081] As described above, the front housing 11, the center housing 12, and the rear housing 13 are connected to each other in the front-rear direction. The connection portion 543 of the receiving member 54 is sandwiched from the front and rear by the rear wall 121 of the center housing 12 and the flange portion 133 of the rear housing 13, and the front end portion and the rear end portion of the main body 541 of the receiving member 54 are configured to protrude into the center housing 12 and the rear housing 13, respectively. Moreover, the screw 19 is inserted from the rear side of the flange portion 133 of the rear housing 13 through the through holes formed in the flange portion 133 of the rear housing 13, the connection portion 543 of the receiving member 54, and the rear wall 121 of the center housing 12, and is fastened to the threaded hole formed in the front housing 11. That is, the receiving member 54 is fixed to the front housing 11 from the rear side by the screw 19 together with the center housing 12 and the rear housing 13. With this structure, the receiving member 54 can be efficiently assembled to the tool body 10 , and the front housing 11 , the center housing 12 , and the rear housing 13 can be assembled.

[0082] like Fig. 9 As shown, in this embodiment, in order to ensure smooth rotation of the nut 41, the receiving member 54 is configured to receive the reaction force (axial force) from the nut 41 via the thrust bearing 55. Therefore, the thrust bearing 55 is arranged between the driven gear 411 and the receiving member 54 in the front-to-back direction. In addition, in this embodiment, the thrust bearing 511 (see FIG. 5 ) of the front receiving portion 51 is Figure 7 ) uses cylindrical rollers as rolling elements. On the other hand, needle rollers are used as rolling elements in the thrust bearing 55 of the rear side receiving portion 53. This is because it is considered that, in the tightening process, the screw 45 moves backward while strongly pulling the pin 81. Compared with this, the reaction force acting on the nut 41 toward the rear when the screw 45 returns forward is smaller, so the axial space in the rear side receiving portion 53 is saved.

[0083] The elastic member 56 is a rubber annular member (so-called O-ring), and is arranged between the thrust bearing 55 and the connection portion 543 of the receiving member 54 in the front-rear direction. More specifically, the elastic member 56 is arranged in a slightly compressed state between the thrust bearing 55 and the rear wall 121, wherein the rear wall 121 is fixed to the front side of the connection portion 543. When there is no reaction force acting toward the rear on the nut 41, the thrust bearing 55 is held in a position where the front ring abuts against the rear end face of the driven gear 411 (more specifically, the rear end face of the root portion of the driven gear 411 that is radially inward (drive axis A1 side) than the gear teeth 412) by the force of the elastic member 56. At this time, the thrust bearing 55 (more specifically, the rear ring) and the receiving member 54 (more specifically, the body 541) are slightly separated from each other in the front-rear direction. That is, when no reaction force acts backward on the nut 41 , a small gap exists between the thrust bearing 55 and the receiving member 54 .

[0084] When a reaction force acts on the nut 41 in the rearward direction, the elastic member 56 allows the nut 41 and the thrust bearing 55 to move backward to a position where the thrust bearing 55 (specifically, the rear end face of the rear ring) abuts against the receiving member 54 (specifically, the front end face of the main body 541) (see Fig.16 ), the details of which will be described later.

[0085] Thus, in the present embodiment, the receiving member 54 receives the reaction force toward the rear that acts on the nut 41 via the driven gear 411 at the rear side of the driven gear 411. In particular, in the present embodiment, the rear end of the receiving member 54 is arranged at a position closer to the front side than the rear end of the nut 41. Therefore, compared with a structure that receives the reaction force at the rear side of the rear end surface of the nut 41, it is possible to prevent the fastening tool 1 from becoming longer in the front-rear direction.

[0086] Furthermore, when attempting to assemble the bearing member 54 and the thrust bearing 55 in a contact state, the bearing member 54 and the thrust bearing 55 need to have high dimensional accuracy. In addition, in the present embodiment, since the bearing member 54 is connected to the front housing 11 via the central housing 12, errors may also occur during assembly. In contrast, in the present embodiment, the bearing member 54 and the thrust bearing 55 are configured via the elastic member 56 so that when there is no reaction force acting toward the rear on the nut 41, the two are separated from each other in the front-to-back direction, and when a reaction force acts on the nut 41, the two are in contact with each other. Therefore, the bearing member 54 and the thrust bearing 55 do not need to have such high dimensional accuracy. Therefore, manufacturing and assembly become easy.

[0087] Next, the internal structure of the battery holding portion 106 will be described.

[0088] As mentioned above, the battery holder 15 is elastically connected to the battery holder 106. Figure 8 , Fig.11 and Fig.12 As shown, the battery holder 15 is disposed separately from the battery holding portion 106 (external case 14 ), and is held by the battery holding portion 106 via an elastic member 150 .

[0089] In more detail, the battery holding portion 106 includes a pair of left and right side walls, an upper wall, a bottom wall 107, and a rectangular parallelepiped protrusion 108 protruding downward from the central portion of the bottom wall 107. The lower end of the protrusion 108 has a rectangular flange portion 109 protruding outward. The elastic member 150 is formed in a rectangular ring shape, mounted on the outer periphery of the protrusion 108, and held between the bottom wall 107 and the flange portion 109. A groove covering the entire periphery is formed on the outer periphery of the elastic member 150. The battery holder 15 has a rectangular frame-shaped upper wall 151 and a peripheral wall 153 protruding downward from the upper wall 151. The battery holder 15 is held on the protrusion 108 by the elastic member 150 in a state where the inner peripheral portion of the upper wall 151 is embedded in the groove of the elastic member 150. Through such an elastic connection structure, the battery holder 15 can move relative to the battery holding portion 106 in all directions including the front-back direction, the left-right direction, and the up-down direction.

[0090] The battery holder 15 has a structure for detachably holding the battery 93. The battery 93 is a rechargeable battery (also referred to as a battery pack) having a known structure, and has a pair of engaging grooves 931 provided on the side and a terminal portion 933 provided on the upper end. Correspondingly, the battery holder 15 has: a pair of guide rails 155 that can be engaged with the pair of engaging grooves 931; and a terminal block 157 that has a terminal portion that can be electrically connected to the terminal portion 933.

[0091] A pair of guide rails 155 extend in the front-to-back direction on the inner side of the lower end of the left and right side walls in the peripheral wall 153 of the battery holder 15, and can be slidably engaged with a pair of engaging grooves 931. The terminal block 157 is held at the central part of the lower end of the battery holder 15. When the battery 93 is slid forward from the rear side relative to the battery holder 15 and arranged at a predetermined position with the engaging groove 931 engaged with the guide rails 155, the terminal portion 933 of the battery 93 is electrically connected to the terminal portion of the terminal block 157. In addition, a hook 935 that can move in the up-down direction is provided at the upper end of the battery 93. When the battery 93 is arranged at the predetermined position, the hook 935 engages with the locking recess (not shown) of the battery holder 15 to prevent the battery 93 from falling off the battery holder 15.

[0092] In addition, in the present embodiment, the elastic component 150 and the battery holder 15 are both composed of a half body divided into left and right parts. When the battery holder 15 is assembled to the tool body 10, first, the left and right halves of the elastic component 150 are embedded between the bottom wall 107 and the flange part 109 from the left and right sides of the protrusion 108. And, the left and right halves of the battery holder 15 are connected to each other by screws in a state where the terminal block 157 is clamped and the upper wall 151 is engaged with the groove of the elastic component 150 from the left and right sides. In this way, the battery holder 15 is elastically connected to the tool body 10 (battery holding part 106).

[0093] When the battery 93 is attached to the battery holder 15 and the battery 93 is subjected to an impact, for example, due to being dropped, the battery holder 15 elastically deforms the elastic member 150 and moves relative to the tool body 10 together with the battery 93. This mitigates the impact on the battery 93 and reduces the possibility of damage to the battery.

[0094] Next, the internal structure of the extension portion 103 will be described.

[0095] like Figure 1 As shown, a controller 20 for controlling the movement of the fastening tool 1 is housed in the extension portion 103. The internal space of the extension portion 103 is connected to the internal space of the housing portion 101 that houses the motor 21 and the drive mechanism 3, and the internal space of the battery holding portion 106 that mounts the battery 93. Therefore, it is possible to facilitate the wiring of the controller 20 with the terminal portion of the motor 21 and the battery holder 15. In addition, although detailed illustrations are omitted, the controller 20 includes a housing, a circuit substrate housed in the housing, and a control circuit mounted on the circuit substrate. In addition, in the present embodiment, the control circuit is configured as a microcomputer including a CPU, ROM, RAM, a timer, etc., and controls the movement of the fastening tool 1 including the drive of the motor 21.

[0096] The controller 20 is formed as a whole in a roughly rectangular shape having a length, a width and a thickness. The controller 20 is arranged adjacent to the front wall 104 in the extension portion 103. In addition, among the length, the width and the thickness of the controller 20, the length is the largest and the thickness is the smallest. The controller 20 is arranged so that its length direction is inclined relative to the drive axis A1. In the present embodiment, the controller 20 is arranged so that its length direction is consistent with the extension direction of the extension portion 103. In addition, the width direction and the thickness direction of the controller 20 are respectively consistent with the left-right direction of the extension portion 103, and the facing directions of the front wall 104 and the rear wall 105. The extension portion 103 extends obliquely relative to the drive axis A1, so it is easiest to ensure the length in the extension direction. Therefore, by setting the orientation of the controller 20 in this way, the controller 20 can be reasonably arranged in the extension portion 103 while suppressing the width of the extension portion 103 in the left-right direction or the thickness in the front-back direction.

[0097] In addition, if Fig.11 and Fig.12 As shown in the figure, an operation display unit 23 is provided on the extension portion 103. The operation display unit 23 includes an operation unit 231 capable of inputting various information in response to external operations of the user and a display unit 233 capable of displaying various information. The operation display unit 23 is arranged on the rear wall 105 (i.e., the surface facing the handle 17) of the extension portion 103 in a manner that can be operated and visually confirmed from the rear side.

[0098] In the present embodiment, the operating unit 231 includes a plurality of push-button switches. For example, the user can input the control conditions of the motor 21 (for example, the target value of the driving current of the motor 21 corresponding to the type of fastener used) by operating the operating unit 231. The operating unit 231 is connected to the controller 20 via an unillustrated wire, and outputs a signal corresponding to the input information to the controller 20. In addition, the display unit 233 includes a plurality of 7-segment LEDs. The display unit 233 is connected to the controller 20 via an unillustrated wire, and displays various information (for example, information related to the set control conditions of the motor 21) according to the control signal from the controller 20.

[0099] The detailed configuration of the handle 17 and the internal structure of the handle 17 are described below.

[0100] like Figure 1 As shown, a trigger 171 is provided on the front surface side of the upper end of the handle 17. In addition, as described above, the upper end of the handle 17 is connected to the rear end of the upper portion of the accommodating portion 101. Therefore, the upper end of the handle 17 is arranged at the lower portion of the accommodating portion 101, that is, arranged at the rear area of ​​the motor 21 (motor body 211). In addition, the rear area of ​​the motor body 211 can also be said to be the area where the motor body 211 is projected to the rear. Therefore, as Figure 6 As shown, when viewed from the rear side, the upper end of the handle 17 overlaps with the area inside the outer periphery of the motor body 211 (the area inside the outer periphery of the stator). Figure 1 As shown, the trigger 171 is arranged on the rotation axis A2 of the motor shaft 213. The central portion and the lower end portion of the handle 17 are arranged in the rear region of the extension portion 103.

[0101] In addition, the handle 17 is thin so that it is easy for the user to hold. In addition, the distance between the handle 17 and the tool body 10 (the lower part of the receiving portion 101 and the extension portion 103) is set so that when the user holds the handle 17, there is a certain degree of space between the user's hand and the tool body 10. On the other hand, if Figure 6 As shown, the width of the extension portion 103 in the left-right direction is wider than the width of the handle 17. In addition, the operation display portion 23 is arranged on the rear wall 105 of the extension portion 103 in a direction that can be operated from the rear side so as to face the lower end of the handle 17. Therefore, even when the user is holding the handle 17, the user can easily visually confirm the operation portion 231, thereby making it easy to operate.

[0102] like Figure 1As shown, a switch 172 is housed inside the handle 17 adjacent to the rear side of the trigger 171. The switch 172 is usually kept in an off state, and becomes an on state according to the pulling operation of the trigger 171. The switch 172 is electrically connected to the controller 20 (control circuit) through an unillustrated wire. When the switch 172 becomes the on state, it outputs an on signal to the controller 20.

[0103] The detailed structure of the head 16 is described below. Figure 1 and Fig.10 As shown, the machine head 16 is mainly composed of an anvil 62 , a connecting sleeve 63 , a pin holding portion 65 and a connecting component 66 .

[0104] The anvil 62 is a long cylindrical body configured to be engaged with the collar 85 of the fastener 8. The anvil 62 has a hole 621 extending in the axial direction. In addition, the diameter of the hole 621 is generally uniform in the front portion of the anvil 62, but only the diameter of the front end portion increases toward the front end. That is, the inner peripheral surface of the front end portion of the anvil 62 is configured as a tapered surface. On the other hand, in the rear portion of the anvil 62, the diameter of the hole 621 gradually increases to a predetermined position as it approaches the rear, and becomes uniform on the rear side of the predetermined position. In addition, in the present embodiment, the front portion and the rear portion of the anvil 62 are formed by connecting separate components connected to each other, but the entire anvil 62 may also be formed by a single component.

[0105] The anvil 62 is connected to the tool body 10 via a connecting sleeve 63 and extends along the drive axis A1. The connecting sleeve 63 is a long cylindrical body. The rear end of the connecting sleeve 63 is threadedly engaged with the inner circumference of the mounting portion 111 (the cylindrical portion of the front housing 11 exposed to the outside from the external housing 14) of the tool body 10. The front end of the connecting sleeve 63 is threadedly engaged with the inner circumference of the rear end of the anvil 62.

[0106] The pin holding portion 65 is configured to hold the pin 81 of the fastener 8 and is held so as to be relatively movable in the front-rear direction along the drive axis A1 relative to the anvil 62. The pin holding portion 65 includes a base 651 and a plurality of holding claws 653. The base 651 and the plurality of holding claws 653 are integrally formed.

[0107] The base 651 is a cylindrical portion that can slide in the rear portion of the anvil 62. The base 651 is connected to the screw 45 via the connecting member 66. The connecting member 66 is a cylindrical member that can slide in the connecting sleeve 63. The rear end of the connecting sleeve 63 is threadedly engaged with the front end of the screw 45. The front end of the connecting member 66 is threadedly engaged with the inner circumference of the base 651 of the pin holding portion 65.

[0108] The plurality of gripping claws 653 extend forward from the front end of the base 651 and are arranged in the front part of the anvil 62. The plurality of gripping claws 653 are arranged in a virtual circle at equal intervals around the drive axis A1. Figure 1 When the pin holding portion 65 is in the initial position shown in FIG. 1 , the front end portion 654 of the holding claw 653 protrudes forward from the front end of the hole 621. The radial thickness of the front end portion 654 is set to be slightly larger than that of other portions. The rear end of the front end portion 654 is configured as a tapered portion whose outer diameter decreases as it approaches the rear. With this structure, as the pin holding portion 65 moves rearward from the initial position and the front end portion 654 enters the hole 621 of the anvil 62, the holding claw 653 is pushed radially inward, and the holding force of the holding claw 653 on the pin 81 increases. In addition, the front end portion 654 can smoothly enter the hole 621 through the tapered portion formed at the front end portion 654 and the tapered surface formed at the front end portion of the anvil 62.

[0109] In addition, as described above, the fastening tool 1 can also fasten a work object using a break-type fastener by replacing the anvil 62 and the pin holding portion 65. Although detailed description and illustration are omitted, the anvil and the pin holding portion for the break-type fastener have substantially the same functions as the anvil 62 and the pin holding portion 65 described above, although they are different in shape.

[0110] As described above, in the tightening tool 1 of this embodiment, the motor 21 and the ball screw mechanism 4 are arranged in the tool body 10 so that the rotation axis A2 of the motor shaft is parallel to the drive axis A1. In addition, a portion (upper end) of the handle 17 is arranged in the rear area of ​​the motor body 211.

[0111] Therefore, compared with the case where the motor 21 is arranged in a manner that the rotation axis A2 and the drive axis A1 extend in directions that intersect each other, it is easy to arrange the motor 21 close to the ball screw mechanism 4. In addition, the first intermediate shaft 32 and the second intermediate shaft 33 for transmitting power from the motor 21 to the ball screw mechanism 4 can also be arranged in parallel with the rotation axis A2 and the drive axis A1. With such a structure, efficient power transmission that suppresses energy loss can be performed from the motor 21 to the ball screw mechanism 4. In addition, the drive mechanism 3 can be made compact as a whole.

[0112] Furthermore, since a portion of the handle 17 is disposed in the rear region of the motor body 211, the user can hold the handle 17 at a position relatively close to the drive axis A1 (also a position relatively close to the weight), thereby improving operability. In particular, in the present embodiment, the trigger 171 is disposed on the rotation axis A2 of the motor shaft 213, and thus, by reliably guiding the user's hand to the portion (upper end) of the handle 17 disposed in the rear region of the motor body 211, it can help improve operability. In addition, since the tool body 10 is connected to the handle 17 in a manner of forming an annular portion, the strength of the handle 17 can be improved and the possibility of breakage can be reduced compared to a case where the handle 17 is connected in a cantilevered manner.

[0113] Next, a description will be given of a process of fastening the work object W using the fastener 8 .

[0114] First, the user appropriately inputs the control conditions of the motor 21 (for example, the target value of the drive current) via the operation unit 231. In addition, the user pre-fixes the fastener 8 to the work object W. In addition, pre-fixing means that Figure 1 As shown, the shaft portion 811 of the pin 81 is inserted into a through hole formed on the working object W in such a way that the head portion 815 of the fastener 8 abuts against a surface of the working object W, and the ring 85 is loosely engaged with the shaft portion 811 from the opposite side of the working object W.

[0115] like Figure 1 As shown, in the initial state where the trigger 171 is not pulled, the screw 45 and the pin holding portion 65 are arranged in the initial position (the forward position). The user causes the top end portion of the shaft portion 811 of the pin 81 to fit into the gap at the center of the front end portion 654 (the portion protruding forward from the hole 621) of the plurality of holding claws 653. At this time, the holding force of the holding claws 653 is such that the shaft portion 811 can be loosely held. When the user pulls the trigger 171 and the switch 172 becomes the on state, the controller 20 (control circuit) starts the forward rotation drive of the motor 21 according to the set control conditions. The torque increased via the planetary reducer 31, the drive gear 321, and the driven gear 411 is transmitted to the nut 41.

[0116] like Fig.13 As shown in FIG. 1 , as the nut 41 rotates, the screw rod 45 moves backward, and the pin holding portion 65 connected to the screw rod 45 also moves backward. As the front end portion 654 of the holding claw 653 enters the hole 621, the shaft portion 811 of the pin 81 is firmly held by the holding claw 653 and pulled backward along the drive axis A1. Fig.14As shown, the collar 85 also enters the hole 621, and the flange 851 abuts against the front end surface of the anvil 62. The collar 85 is strongly pushed forward and radially inward by the anvil 62 to be deformed, thereby firmly clamping the work object W between the head 815 of the pin 81 and being riveted to the shaft portion 811. In addition, a strong load is required to rivet the collar 85 to the shaft portion 811. This load acts on the nut 41 as a reaction force toward the front via the pin holding portion 65, the connecting member 66 and the screw 45.

[0117] In contrast, in the present embodiment, the front bearing portion 51 (thrust bearing 511) allows the rotation of the nut 41 while receiving the reaction force from the nut 41 in the forward direction, and transmits it to the connecting sleeve 63. On the other hand, the anvil 62 is pressed against the work object W via the collar 85, and receives a force in the backward direction. Therefore, the anvil 62 and the connecting sleeve 63 as a whole receive a force in the compression direction from both ends in the axial direction (front-rear direction).

[0118] When the collar 85 is riveted to the shaft 811 of the pin 81, the fastening of the work object W is completed. The controller 20 (control circuit) stops the forward drive of the motor 21 at the moment of riveting completion, so that the screw 45 stops moving backward. In addition, the riveting completion judgment (i.e., the stop control of the screw 45 moving backward) can be performed by any known method. The controller 20 can, for example, judge the completion of riveting based on the driving state of the motor 21 (for example, the driving current of the motor 21, the rotation speed of the motor 21). After stopping the forward drive of the motor 21, the controller 20 drives the motor 21 in reverse to move the screw 45 forward, thereby returning the screw 45 and the pin holding portion 65 to the initial position.

[0119] As described above, since a strong load is applied when the collar 85 is riveted to the pin 81, when the riveting is completed, the collar 85 is firmly pressed against the front end of the hole 621 of the anvil 62. Fig.15 As shown, a relatively strong load is required to move the pin holding portion 65 holding the shaft portion 811 forward to disengage the collar 85 from the anvil 62. This load acts on the nut 41 via the pin holding portion 65, the connecting member 66 and the screw 45 as a reaction force toward the rear.

[0120] In this embodiment, the rear side receiving portion 53 disposed on the rear side of the driven gear 411 receives the rearward reaction force acting on the nut 41 via the driven gear 411. Fig.16As shown, the rear end face of the tooth root portion of the gear 411 pushes the thrust bearing 55 by the reaction force toward the rear. The thrust bearing 55 moves slightly toward the rear while compressing the elastic member 56, and abuts against the receiving member 54 (the front end face of the main body 541). The receiving member 54 receives the reaction force transmitted via the rear end face of the driven gear 411 and the thrust bearing 55. During this period, the thrust bearing 55 allows the nut 41 to rotate smoothly.

[0121] As described above, the receiving member 54 is connected to the front housing 11 together with the center housing 12 and the rear housing 13 by the screws 19 directly fastened to the front housing 11. Therefore, compared with the case where the receiving member 54 is connected to the center housing 12 or the rear housing 13 instead of the front housing 11, the possibility of the connection between the front housing 11, the center housing 12 and the rear housing 13 becoming loose can be reduced even if the receiving member 54 is subjected to a reaction force.

[0122] In the process of the screw rod 45 and the pin holding portion 65 returning to the initial position, the holding claw 653 moves radially outward as the front end portion 654 of the holding claw 653 moves forward from the hole 621. Fig.17 As shown, when the pin holding portion 65 returns to the initial position, the fastener 8 in a state where the collar 85 is riveted to the pin 81 can be detached from the holding claw 653 .

[0123] When the screw 45 returns to the initial position, the controller 20 stops the reverse drive of the motor 21. In addition, the judgment of whether to return to the initial position (that is, the stop control of the screw 45 moving forward) can be performed by any known method. Although detailed description is omitted, the controller 20 can stop the reverse drive of the motor 21 by judging whether the screw 45 returns to the initial position based on the detection result of the position sensor 27 that can detect the position of the screw 45. For example, a Hall sensor that can detect the magnet 271 installed on the screw 45 can be used as the position sensor 27.

[0124] In addition, although detailed illustration is omitted, the user can hang the fastening tool 1 using, for example, a wire having one end fixed to the work site and a mounting member at the other end, thereby reducing the burden of continuously holding the fastening tool 1 in the same posture. On the other hand, the use posture of the fastening tool 1 changes depending on the arrangement of the work object. Therefore, the user can appropriately change the installation position of the hook 145 as described above according to the actual use posture.

[0125] In addition, the user may adjust the auxiliary handle 91 (see Figure 2) is mounted on the mounting portion 111, so that the handle 17 is held with one hand and the auxiliary handle 91 is held with the other hand, so that the tightening operation can be performed while firmly holding the tightening tool 1. Since the handle 17 and the auxiliary handle 91 are respectively arranged on the rear side and the front side of the heavy objects such as the motor 21 and the drive mechanism 3, the user can stably operate the tightening tool 1.

[0126] The following shows the correspondence between the various structural elements of the above-mentioned embodiment and the various structural elements of the present invention. However, the various structural elements of the embodiment are only examples and do not limit the various structural elements of the present invention. The fastening tool 1 is an example of a "fastening tool". The fastener 8, the pin 81 and the collar 85 are examples of a "fastener", a "pin" and a "cylindrical portion", respectively. The motor 21, the motor body 211, the motor shaft 213, and the rotation axis A2 are examples of a "motor", a "motor body", a "motor shaft", and a "rotation axis of the motor shaft", respectively. The ball screw mechanism 4 is an example of a "fastening mechanism". The drive axis A1 is an example of a "drive axis". The tool body 10 is an example of a "tool body". The handle 17 is an example of a "main handle".

[0127] The trigger 171 is an example of a "first operating member". The housing portion 101 and the battery holding portion 106 are examples of a "first portion" and a "second portion", respectively. The battery 93 is an example of a "battery". The extension portion 103 is an example of a "third portion". The operating portion 231 is an example of a "second operating member". The controller 20 is an example of a "controller". The battery holder 15, the guide rail 155, and the terminal block 157 (terminal portion) are examples of a "battery holder", a "first engaging portion", and a "first terminal", respectively. The engaging groove 931 and the terminal portion 933 of the battery 93 are examples of a "second engaging portion" and a "second terminal", respectively. The elastic member 150 is an example of an "elastic member". The mounting portion 111 and the auxiliary handle 91 are examples of a "mounting portion" and a "auxiliary handle", respectively. The hook 145 is an example of a "engaging member".

[0128] In addition, the above-mentioned embodiment is only an example, and the fastening tool involved in the present invention is not limited to the structure of the fastening tool 1 shown in the example. For example, the following changes can be made. In addition, only any one or more of these changes can be used in combination with the fastening tool 1 shown in the embodiment or the invention described in each technical solution.

[0129] For example, the fastening tool 1 can correspond to any of the non-fracture type and the fracture type multi-component riveted fasteners by replacing the anvil 62 and the pin holding portion 65 as described above. In addition, the fastening tool 1 can also correspond to a known fastener of the type called a blind rivet (or rivet) by replacing the anvil 62 and the pin holding portion 65. The blind rivet is composed of an integrally formed pin and a cylindrical portion (also called a sleeve or a rivet body). Like the fracture type multi-component riveted fastener, the pin tail of the blind rivet is pulled off during the fastening process. In addition, the fastening tool 1 can also be a dedicated device that corresponds to only any one type of non-fracture type multi-component riveted fastener, fracture type multi-component riveted fastener, and blind rivet.

[0130] The shape, structural elements and connection method of the tool body 10 can be appropriately changed. For example, the extension portion 103 may not be inclined relative to the drive axis A1, but may extend in a direction orthogonal to the drive axis A1. In addition, for example, the central shell 12 and the rear shell 13 may be changed to a single shell. For example, the entirety of the outer shell 14 may not be formed by left and right split bodies, but by connecting a plurality of separately formed housing bodies (such as a box-shaped body and a cylindrical body) to each other through fixing components (such as screws). The handle 17 may also be formed separately from the tool body 10 and connected to the tool body 10 through a fixing component (such as a screw).

[0131] The shape, size, structure and configuration position of the hook 145 mounted on the tool body 10, the plate 143 for mounting, and the configuration position can be changed appropriately. For example, the hook 145 can be mounted on the side wall instead of the upper wall 141 of the tool body 10. The hook 145 can also be mounted on the tool body 10 instead of the separate screw 147, and the hook 145 itself can be screwed with the tool body 10. In addition, the mountable position of the hook 145 (for example, the number of threaded holes 144) can also be changed appropriately. In addition, the hook 145 can also be omitted.

[0132] The structure and arrangement of the internal mechanism of the tool body 10 can be appropriately changed as follows, for example.

[0133] For example, as long as the motor 21 is arranged so that the rotation axis A2 extends parallel to the drive axis A1, it may be changed to a brushed motor, an AC motor, or an outer rotor type motor in which a rotor is arranged radially outside a stator.

[0134] In the drive mechanism 3, a feed screw mechanism having a nut and a screw directly engaged with the nut may be used instead of the ball screw mechanism 4. The type and arrangement of the bearings 421 and 422 supporting the nut 41, and the structural elements and arrangement of the front support portion 51 and the rear support portion 53 are not limited to the examples of the above-mentioned embodiment. In addition, in a rupture type multi-component riveted fastener or blind rivet dedicated device, when the screw 45 moves forward, the reaction force acting on the nut 41 toward the rear is small. Therefore, the rear support portion 53 may also be omitted.

[0135] The mechanism for transmitting power from the motor 21 to the ball screw mechanism 4 is not limited to the example of the above-mentioned embodiment. For example, the number of planetary gear mechanisms included in the planetary reducer 31 may be a number other than three. Instead of the planetary reducer 31, a gear reducer including a gear train other than the planetary gear mechanism may be arranged between the motor 21 and the ball screw mechanism 4. The idler gear 331 arranged between the drive gear 321 of the first intermediate shaft 32 and the driven gear 411 of the nut 41 may be omitted, and the drive gear 321 and the driven gear 411 may be directly meshed.

[0136] The battery holder 15 may be provided on the front wall 104 side of the extension 103 instead of the battery holder 106. In addition, the battery holder 15 may be omitted, and the tool body 10 (for example, the battery holder 106) may have a mounting portion for the battery 93 such as the rail 155 and the terminal block 157. That is, the battery 93 may be directly mounted on the tool body 10 without passing through the battery holder 15. In addition, the fastening tool 1 may be configured to operate not by the power supplied by the battery 93 but by the power supplied from an external AC power source.

[0137] The controller 20 may also be arranged in the accommodating portion 101 or the battery holding portion 106 instead of the extension portion 103. In addition, as described above, when the extension portion 103 extends in a direction orthogonal to the drive axis A1, the controller 20 may also be arranged in the extension portion 103 in a manner that the length direction is inclined relative to the drive axis A1. In this case, the controller 20 can be reasonably arranged in the extension portion 103 while suppressing the enlargement of the extension portion 103. The operation display portion 23 may also be arranged on the upper wall of the battery holding portion 106 instead of the rear wall 105 of the extension portion 103. In addition, the operation portion 231 may not be a push-button switch, but a sliding switch, a rotary dial, or a touch screen integrated with the display portion 233. In addition, the operation display portion 23 may also be omitted.

[0138] The structure and connection method of the machine head 16 can be changed appropriately. For example, the shape of the anvil 62 and the connection method with the tool body 10 via the connecting sleeve 63 can also be changed. For example, the anvil 62 can also be directly screwed with the tool body 10 (mounting portion 111) without the connecting sleeve 63. Similarly, the shape of the pin holding portion 65 and the connection method with the screw 45 via the connecting component 66 can also be changed. For example, the pin holding portion 65 can also be directly connected to the screw 45 without the connecting component 66. The pin holding portion 65 only needs to be constructed to change the holding force of the plurality of holding claws 653 in conjunction with the relative movement in the front-to-back direction relative to the anvil 62. For example, the shape and number of the holding claws 653 can be changed appropriately.

[0139] Furthermore, in view of the gist of the present invention and the above-mentioned embodiment, the following aspects are constructed. At least one of the following aspects can be used in combination with one or more of the above-mentioned embodiment and its modified examples, and the invention described in each claim.

[0140] [Mode 1] In Mode 1, the one end of the main handle is located between the drive axis and the rotation axis in a direction orthogonal to the drive axis and the rotation axis.

[0141] [Mode 2] The fastening mechanism is a ball screw mechanism or a feed screw mechanism, and includes a cylindrical nut and a shaft, wherein the nut is configured to be supported on the tool body in a manner that allows rotation around the drive axis, and is driven to rotate around the drive axis by the power of the motor, and the shaft is configured to move along the drive axis by the rotation drive of the nut, and the first part includes a fourth part and a fifth part, wherein the fourth part accommodates the ball screw mechanism or the feed screw mechanism, and the fifth part accommodates the motor, and the rear end of the fourth part protrudes rearward than the fifth part, and one end of the main handle is connected to the rear end of the fourth part. The ball screw mechanism 4, the nut 41, and the screw 45 are examples of the "ball screw mechanism", "nut", and "shaft" of this mode, respectively. The upper part and the lower part of the accommodating portion 101 are examples of the "fourth part" and the "fifth part" of this mode, respectively.

[0142] [Mode 3] The device further comprises an intermediate shaft for transmitting the power of the motor to the fastening mechanism, wherein the rotation axis of the intermediate shaft extends parallel to the drive axis. The first intermediate shaft 32 and the second intermediate shaft 33 are examples of the "intermediate shaft" of this mode.

[0143] [Mode 4] The third portion extends obliquely rearward relative to the drive shaft as it moves from the first portion toward the second portion.

[0144] [Mode 5] The second portion extends substantially parallel to the drive axis.

[0145] [Mode 6] The mounting portion is provided at a front end portion of the first portion.

[0146] [Mode 7] The engaging member is a hook and is mounted on the tool body by screws, and the tool body has a plurality of threaded holes that can be fastened with the screws. The hook 145 and the threaded hole 144 are examples of the "hook" and the "threaded hole" of this mode, respectively.

Claims

1. A fastening tool, which is configured to fasten a work object by a fastener having a pin and a cylindrical portion, wherein: It has a motor, a fastening mechanism, a tool body and a main handle, wherein: The motor has a motor body and a motor shaft, wherein the motor body includes a stator and a rotor, and the motor shaft extends from the rotor and can rotate integrally with the rotor; The fastening mechanism is configured to pull the pin backward relative to the cylindrical portion along a drive axis by the power of the motor, thereby fastening the work object by the fastener, wherein the drive axis defines the front-rear direction of the fastening tool; The tool body accommodates the motor and the fastening mechanism; The main handle is an elongated main handle extending in a direction intersecting the drive axis and connected to the tool body in a manner of forming an annular portion together with the tool body. The rotation axis of the motor shaft extends parallel to the drive axis, The main handle is arranged at a position where the drive axis does not pass through. A portion of the main handle is disposed within a rear region of the motor body.

2. The fastening tool according to claim 1, characterized in that: A first operating member is provided, which can be externally operated by a user to start the motor, The first operating member is provided on the main handle and is arranged on the rotation axis of the motor shaft.

3. The fastening tool according to claim 1 or 2, characterized in that: The tool body comprises a first part and a second part, wherein: The first portion accommodates the motor and the fastening mechanism; The second portion is configured to hold the battery in a detachable manner. The first portion, the second portion and the main handle form at least a portion of the ring.

4. The fastening tool according to claim 3, characterized in that: The two ends of the main handle are connected to the first part and the second part of the tool body respectively. The tool body includes a third portion, which is separated from the main handle at the front side of the main handle and extends in a direction intersecting the drive axis and connects the first portion and the second portion. The first portion, the second portion, the third portion and the main handle form the ring.

5. The fastening tool according to claim 4, characterized in that: The device further comprises a second operating member, which can be externally operated by a user for information input. The second operating component is disposed on the third portion in a manner facing the main handle.

6. The fastening tool according to claim 4, characterized in that: A controller is also provided, the controller being configured to control the action of the fastening tool, The controller is accommodated in the third part.

7. The fastening tool according to claim 6, characterized in that: The controller has a length, a width and a thickness, among which the length is the largest, and the controller is configured such that a length direction thereof is inclined relative to the driving axis.

8. The fastening tool according to claim 3, characterized in that: A battery holder is also provided, the battery holder having a first engaging portion capable of physically engaging with the second engaging portion of the battery, and a first terminal capable of electrically connecting with the second terminal of the battery, The battery holder is held by the second portion via an elastic member.

9. The fastening tool according to claim 1 or 2, characterized in that: The tool body has a mounting portion on which an auxiliary handle gripped by a user can be mounted.

10. The fastening tool according to claim 1 or 2, characterized in that: The tool body further comprises an engaging member configured to engage with a hanging member and mounted on the tool body, wherein the hanging member is provided separately from the tightening tool. The tool body is configured to be capable of changing a mounting position of the engagement member.

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