JP6822904B2 - Fastening tool - Google Patents

Description

The present invention relates to a fastening tool for fastening a work material via a fastener.

A fastening tool for fastening a plurality of working materials via a fastener provided with a pin and a tubular portion is known. As fasteners, a so-called blind rivet in which a pin and a tubular portion (also referred to as a rivet body or a sleeve) are integrally formed, or a pin and a tubular portion (also referred to as a collar) are separate from each other. A so-called multi-piece swage type fastener (multi-piece swage type fastener) formed as is used.

For example, Patent Document 1 discloses a blind rivet fastening tool. This fastening tool is configured to convert the rotational movement of the ball screw nut, which is rotationally driven by the motor, into the backward movement of the ball screw shaft, and firmly grip the pin of the blind rivet with the pin gripping portion to pull it in strongly. .. As a result, the tubular portion of the fastener is deformed so that both ends of the tubular portion firmly hold the work material, and when the pin breaks at the small diameter portion for breaking, the fastening is completed.

Japanese Unexamined Patent Publication No. 2013-248643

In the fastening tool, the ball screw nut is held in the housing in a state where the axial movement is restricted. However, in this fastening tool, a strong axial force is applied to the ball screw nut due to the impact when the pin is broken, and the impact may damage the housing.

In view of such a situation, an object of the present invention is to provide a technique that contributes to improving the durability of a housing in a fastening tool.

According to one aspect of the present invention, there is provided a fastening tool configured to fasten a work material via a fastener provided with a pin and a tubular portion. This fastening tool includes a housing, a fastener contact portion, a pin grip portion, a motor, and a drive mechanism.

The housing extends in the anteroposterior direction of the fastening tool along a predetermined drive shaft. The fastener contact portion is held at the front end portion of the housing so as to be able to contact the tubular portion of the fastener. The pin gripping portion is held so as to be relatively movable in the front-rear direction along the drive shaft with respect to the fastener contact portion, and is configured to be able to grip a part of the fastener pin. The drive mechanism is driven by the power of the motor, and by moving the pin grip portion rearward with respect to the fastener contact portion along the drive shaft, the pin gripped by the pin grip portion is pulled and the fastener contact portion is pulled. It is configured to deform the tubular portion that is in contact with the fastener, thereby fastening the work material via the fastener.

In the fastening tool of this aspect, the housing includes a rotating member holding portion. Further, the drive mechanism includes a rotating member and a moving member. The rotating member is configured to be supported by a rotating member holding portion and to be rotationally driven by the power of a motor in a state where movement in the front-rear direction is restricted and the rotating member can rotate around a drive shaft. The moving member is connected to the pin gripping portion, is restricted from rotating around the drive shaft, and engages with the rotating member in a state of being movable in the front-rear direction along the drive shaft, and is driven by the rotation of the rotating member. It is configured to move linearly in the front-back direction. Further, the fastening tool includes an elastic member that is interposed behind the rotating member and between the rotating member and the rotating member holding portion.

In the fastening tool of this embodiment, the drive mechanism for moving the pin grip portion relative to the fastener contact portion moves linearly in the front-rear direction by the rotational drive of the rotary member and the rotary member driven by the power of the motor. It is equipped with a moving member. Typical examples of such a drive mechanism include a feed screw mechanism and a ball screw mechanism. Both the feed screw mechanism and the ball screw mechanism are mechanisms capable of converting rotary motion into linear motion. In the feed screw mechanism, the female screw portion formed on the inner peripheral surface of the cylindrical rotating member and the male screw portion formed on the outer peripheral surface of the moving member inserted through the rotating member are directly engaged with each other. (Screw). On the other hand, in the ball screw mechanism, the rotating member and the moving member roll in a spiral track formed between the inner peripheral surface of the cylindrical rotating member and the outer peripheral surface of the moving member inserted through the rotating member. Engage through a large number of balls arranged as possible.

In the drive mechanism, the rotating member is held by the rotating member holding portion in a state where the movement in the front-rear direction is restricted. However, when the moving member moves the pin grip portion backward relative to the fastener contact portion and pulls the pin, and the pin breaks, the impact causes a strong force to move the rotating member relatively rearward. Works. As a result, a rearward impact is applied to the portion of the rotating member holding portion that is arranged rearward. In this embodiment, an elastic member is interposed and arranged between the rotating member and the rotating member holding portion of the housing. Therefore, since the elastic member cushions the impact, the possibility of damage to the rotating member holding portion can be effectively reduced. Thereby, the durability of the housing including the rotating member holding portion can be enhanced.

Examples of fasteners that can be used in the fastening tool of this embodiment include so-called blind rivets and multi-piece swage type fasteners (multi-piece swage type fasteners).

In a blind rivet, the pin and the tubular portion (also referred to as the rivet body or sleeve) are integrally formed. A flange is integrally formed at one end of the tubular portion. Typically, the shaft portion of the pin penetrates the tubular portion and projects long toward one end side on which the flange of the tubular portion is formed, and the head projects so as to be adjacent to the other end of the tubular portion. The blind rivet is a fastener of the type that holds the work material between the flange part at one end of the tubular part and the other end of the tubular part that is deformed so that the pin is pulled in the axial direction to increase the diameter. is there. On the other hand, in the fastener of the multi-member crimping type, the pin and the tubular portion (also referred to as the collar) through which the pin is inserted are originally formed as separate bodies from each other. The multi-member crimping type fastener is a type of fastener in which a work material is sandwiched between a pin head and a tubular portion crimped to a pin shaft portion.

In the case of a blind rivet, a part of the pin (also called a pin tail or a mandrel) is finally torn off by a small diameter portion for breaking and separated by the fastening operation. On the other hand, there are two types of fasteners with multiple member crimping type, one in which the pin tail is torn off and the other in which the shaft portion is maintained as it is, as in the case of the blind rivet. In any type of fastener, the fastener is used to fasten the work material by moving the pin relative to the tubular portion by the fastening mechanism.

The housing is a part also called a tool body. The housing may be formed by connecting a plurality of portions including a rotating member holding portion. Further, the housing may be a one-layer structure housing or a two-layer structure housing.

The motor may be a DC motor or an AC motor, and the presence or absence of a brush is not particularly limited. However, from the viewpoint of small size and high output, it is preferable to use a brushless DC motor.

The fastener contact portion may be in contact with the tubular portion of the fastener, and its configuration is not particularly limited. For example, when a blind rivet is used, the fastener contact portion may be in contact with the flange of the tubular portion (rivet body or sleeve) and can be pressed. Further, for example, when a plurality of member crimping type fasteners are used, the fastener contact portion may be configured to engage with the tubular portion (collar) so that the tubular portion can be deformed by the crimping force. .. In any case, any known configuration can be adopted. The fastener contact portion is typically configured as a tubular body. The fastener contact portion may be held by the housing by being directly connected to the housing or by being connected via another member. The fastener contact portion may be configured to be removable from the housing.

The pin grip portion may be held so as to be relatively movable in the front-rear direction along the drive shaft with respect to the fastener contact portion, and may be configured to be able to grip a part of the pin, and the configuration is particularly limited. is not it. For example, when a blind rivet is used or when a multi-member crimp fastener is used, it has a plurality of claws capable of gripping a part of a pin (specifically, a shaft portion of the pin). Any known configuration can be employed that includes a jaw and a jaw holder (also referred to as a jaw case). The pin grip portion is typically arranged coaxially with the fastener contact portion inside the tubular fastener contact portion. The pin grip portion may be configured to be detachable from the housing.

As the drive mechanism, as described above, a feed screw mechanism or a ball screw mechanism can be preferably adopted. The rotating member is typically held by the rotating member holding portion via a bearing. The moving member may be directly connected to the pin grip, or may be connected (ie, indirectly) via another member.

In the present invention, in the front-rear direction, an intervening member arranged between the rotating member and the rotating member holding portion is interposed behind the rotating member and between the intervening member and the rotating member holding portion. The elastic member is provided, and the intervening member is configured to be movable with respect to the rotating member holding portion in the front-rear direction, and the distance between the intervening member and the rotating member holding portion is determined by the elastic member. It is configured to specify the upper limit of the amount of compression.
The elastic member may be any member having elasticity, and for example, rubber, synthetic resin, or a spring can be preferably used.

According to one aspect of the present invention, the rotating member holding portion may be configured to hold the rotating member in the front-rear direction. In other words, a part of the rotation holding portion may be arranged on the front side and the rear side of the rotating member, respectively. As a result, it is possible to more reliably regulate the movement of the rotating member in the front-rear direction when the drive mechanism is operated.

According to one aspect of the present invention, the rotating member holding portion is formed by connecting a front member that holds the rotating member from the front and a rear member that holds the rotating member from the rear to each other in the front-rear direction. You may be. The rotating member holding portion having such a configuration is easy to assemble, but when the pin is broken, a rear impact is applied to the rear side portion and the connection with the front side portion is loosened. It becomes possible to move in the front-rear direction, and the pin gripping portion may not be able to properly grip the pin. According to this aspect, the elastic member cushions the impact, so that the looseness of the connection can be effectively suppressed.

Further, in another embodiment of the present invention, in the front-rear direction, an intervening member arranged between the rotating member and the rotating member holding portion, and behind the rotating member, and between the intervening member and the rotating member holding portion. It is configured to include an elastic member interposed between the rotating member and the rotating member in a state in which the transmission of the rotational force of the rotating member is blocked.
The intervening member may have a flange portion, and the elastic body may be interposed and arranged between the flange portion and the rotating member holding portion.

According to one aspect of the invention, the fastening tool may further include a position detecting mechanism configured to detect that the pin grip has been placed at a predetermined reference position. After fastening the work material, the drive mechanism moves the pin grip portion forward relative to the fastener contact portion along the drive shaft based on the detection result of the position detection mechanism, and arranges the pin grip portion at a predetermined initial position. It may be configured in. When the pin grip portion connected to the moving member is moved forward beyond the initial position, the intervening member comes into contact with the abutting portion provided on the moving member, whereby the moving member and the pin grip portion are in front of each other. It may be provided with a movement control unit configured to regulate movement to. That is, when the pin grip portion is moved forward beyond the initial position, it comes into contact with the movement restricting portion of the intervening member and cannot move further forward. The reference position and the initial position may be the same position or different positions. According to this aspect, even if the pin gripping portion exceeds the initial position due to a malfunction of the position detection mechanism or the like, the movement of the moving member and the pin gripping portion can be restricted by the movement restricting portion of the intervening member. .. This makes it possible to reduce the possibility that the moving member and the pin gripping portion will move forward beyond the limit and damage other parts.

The elastic member may be held in a state of being pressurized. Further, the fastening tool may further include a movement amount regulating unit that regulates the rearward movement amount of the rotating member with respect to the rotating member holding portion. With respect to the elastic member, "held in a state where a pressurization is applied" means that the elastic member is held in an elastically deformed state. For example, it means that the elastic member made of rubber is held in a slightly compressed state. According to this aspect, the amount of movement of the rotating member to the rear with respect to the rotating member holding portion, that is, the amount of further elastic deformation of the elastic member is regulated, so that the elastic member reliably absorbs the impact. While maintaining, the durability of the elastic member can be increased.

According to one aspect of the present invention, the drive mechanism may be configured to fasten the work material via a fastener and break the pin at a small diameter portion for breaking. Further, the moving member may be configured as a hollow member extending in the front-rear direction along the drive shaft and having an internal passage through which the pintail separated by breakage can pass. According to this aspect, there is provided a fastening tool of a type capable of breaking the pin to complete the fastening and discharging the pin tail separated by the break. In such a fastening tool, the elastic member cushions the impact, so that the possibility of damage to the rotating member holding portion can be effectively reduced.

According to one aspect of the present invention, the rear end portion of the housing has an opening formed so as to communicate the internal passage of the moving member with the outside of the housing, and the pintail collection container discharged through the opening. May be configured to be removable. The fastening tool may further include a dustproof member held at the rear end of the housing so as to contact the outer peripheral surface of the rear end of the moving member. The dustproof member is arranged so that the outer peripheral surface slides with respect to the dustproof member when the moving member moves in the front-rear direction, and is arranged so as to prevent dust from entering in front of the dustproof member. You may be.

According to this aspect, the pintail discharged through the internal passage of the moving member and the opening of the housing can be accommodated in the collection container. Metal powder that is caused by the breakage of the pin and adheres to the pin tail and is carried is likely to collect in the collection container. This metal powder may adhere to the outer peripheral surface of the rear end portion of the moving member and enter the housing through the opening. In addition to the metal powder, sand particles and the like may invade through the opening. According to this aspect, the dustproof member is arranged so that the outer peripheral surface slides with respect to the dustproof member when the moving member moves in the front-rear direction, and various metal powders, sand particles, etc. are arranged in front of the dustproof member. It is possible to prevent foreign matter (dust) from entering. As a result, it is possible to prevent a malfunction of the internal mechanism due to dust. The material of the dustproof member is not particularly limited, but for example, felt, rubber, non-woven fabric, paper, sponge and the like can be adopted. Further, the shape of the dustproof member is not particularly limited, and for example, an annular member surrounding the outer peripheral surface of the moving member, a brush-shaped member surrounding the outer peripheral surface of the moving member, and the like can be adopted.

It is explanatory drawing of the fastener (blind rivet). It is a vertical cross-sectional view of a fastening tool. It is a partially enlarged view of FIG. It is a cross-sectional view of the rear part of a fastening tool. It is another partially enlarged view of FIG. It is explanatory drawing of arrangement of a drive mechanism, a motor, a handle, and a collection container when the fastening tool is seen from the rear. It is explanatory drawing of the fastening process, and is the vertical sectional view of the fastening tool when the drive shaft is arranged between the initial position and the stop position. Another explanatory view of the fastening process is a vertical cross-sectional view of the fastening tool when the drive shaft is arranged between the stop positions. It is explanatory drawing of the fastening tool which has a dustproof member, and is explanatory drawing which shows the rear end part of the housing when the drive shaft is arranged between the initial positions. It is explanatory drawing which shows the rear end part of the housing when the drive shaft is arranged between the stop positions. It is explanatory drawing of the fastening tool which has another dustproof member, and is explanatory drawing which shows the rear end part of the housing when the drive shaft is arranged between the initial positions. It is explanatory drawing which shows the rear end part of the housing when the drive shaft is arranged between the stop positions.

Hereinafter, embodiments will be described with reference to the drawings. In the following embodiment, a fastening tool 1 capable of fastening a work material using a fastener is illustrated.

First, a fastener 8 as an example of a fastener that can be used in the fastening tool 1 will be described with reference to FIG. The fastener 8 is a known fastener of a type called a blind rivet (also referred to as a blind fastener), and is composed of a pin 81 integrally formed and a main body 85.

The main body 85 is a tubular body including a cylindrical sleeve 851 and a flange 853 protruding radially outward from one end of the sleeve 851. The pin 81 is a rod-shaped body that penetrates the main body 85 and projects from both ends of the main body 85. The pin 81 includes a shaft portion 811 and a head 815 formed at one end of the shaft portion. The head 815 is formed to have a diameter larger than the inner diameter of the sleeve 851, and is arranged so as to project from the end of the sleeve 851 on the side opposite to the flange 853. The shaft portion 811 penetrates the main body portion 85 and protrudes in the axial direction from the end portion on the flange 853 side. A small diameter portion 812 for breaking is formed in a portion of the shaft portion 811 arranged in the sleeve 851. The small diameter portion 812 is a portion having a relatively weaker strength than the other portions, and is configured to break first when the pin 81 is pulled in the axial direction. The portion of the shaft portion 811 opposite to the head 815 with respect to the small diameter portion 812 is referred to as a pin tail 813. The pin tail 813 is a portion separated from the pin 81 (fastener 8) when the shaft portion 811 is broken.

Hereinafter, the fastening tool 1 will be described. First, the schematic configuration of the fastening tool 1 will be briefly described with reference to FIG.

As shown in FIG. 2, the outer shell of the fastening tool 1 is mainly formed by an outer housing 11, a handle 15, and a nose portion 6 held via a nose holding member 14.

In the present embodiment, the outer housing 11 is formed in a substantially rectangular box shape and extends along a predetermined drive shaft A1. The nose portion 6 is held at one end of the outer housing 11 in the major axis direction via the nose holding member 14 so as to extend along the drive shaft A1. A collection container 7 capable of accommodating the pin tail 813 (see FIG. 1) separated in the fastening process is detachably attached to the other end of the outer housing 11. The handle 15 projects from the central portion of the outer housing 11 in the long axis direction in a direction intersecting the drive shaft A1 (in the present embodiment, a direction substantially orthogonal to each other).

In the following, regarding the direction of the fastening tool 1, for convenience of explanation, the extending direction of the drive shaft A1 (also referred to as the long axis direction of the outer housing 11) is the front-rear direction of the fastening tool 1, and the side where the nose portion 6 is arranged. Is defined as the front side, and the side on which the collection container 7 is attached / detached is defined as the rear side. Further, the direction orthogonal to the drive shaft A1 and corresponding to the extending direction of the handle 15 is defined as the vertical direction, the side on which the outer housing 11 is arranged is defined as the upper side, and the protruding end (free end) side of the handle 15 is defined as the lower side. To do. Further, the direction orthogonal to the front-back direction and the up-down direction is defined as the left-right direction.

As shown in FIG. 2, the outer housing 11 mainly includes a motor 2, a drive mechanism 4 driven by the power of the motor 2, and a transmission mechanism 3 for transmitting the power of the motor 2 to the drive mechanism 4. Has been done. In the present embodiment, a part of the drive mechanism 4 (specifically, the nut 41 of the ball screw mechanism 40) is housed in the inner housing 13. The inner housing 13 is fixedly held by the outer housing 11. From this point of view, the outer housing 11 and the inner housing 13 can be integrally regarded as the housing 10. In the present embodiment, the outer housing 11 is integrally formed of resin with the handle 15, while the inner housing 13 is made of metal (specifically, aluminum).

The handle 15 is configured to be grippable by the user. A trigger 151 is provided at the upper end of the handle 15 (the base end connected to the outer housing 11) so that the user can press (pull) the handle 15. A battery mounting portion 158 configured so that the battery 159 can be attached and detached is provided at the lower end portion of the handle 15. The battery 159 is a power source that can be repeatedly charged to supply electric power to each part of the fastening tool 1 and the motor 2. Since the configurations of the battery mounting portion 158 and the battery 159 are well known, their description will be omitted.

The fastening tool 1 of the present embodiment is configured so that the work material can be fastened via the fastener 8. In the fastener 8 (see FIG. 1), a part of the pin tail 813 is inserted into the tip of the nose portion 6 of the fastening tool 1, and the main body portion 85 and the head 815 protrude from the tip portion of the nose portion 6, which will be described later. It is gripped by the jaw 65 (see FIG. 5). Then, the sleeve 851 is inserted into the mounting hole formed in the working material W until the flange 853 comes into contact with one surface of the working material W to be fastened. When the drive mechanism 4 is driven via the motor 2 in response to the pressing operation of the trigger 151 and the pin tail 813 is strongly pulled, the diameter of the end of the sleeve 851 on the head 815 side expands, and between this end and the flange 853. The work material W is sandwiched between the two. Further, the shaft portion 811 is broken at the small diameter portion 812, and the pin tail 813 is separated. In the fastening tool 1, a plurality of types of fasteners including the fastener 8 illustrated in FIG. 1 can be used.

Hereinafter, the detailed configuration of the fastening tool 1 will be described.

First, the motor 2 will be described. As shown in FIG. 3, the motor 2 is housed in the lower portion of the rear end portion of the outer housing 11. In this embodiment, a small, high-output brushless DC motor is adopted as the motor 2. The motor 2 includes a motor main body 20 including a stator 21 and a rotor 23, and a motor shaft 25 extending from the rotor 23 and rotating integrally with the rotor 23. The motor 2 is arranged so that the rotation shaft A2 of the motor shaft 25 extends below the drive shaft A1 in parallel with the drive shaft A1 (that is, in the front-rear direction). In the present embodiment, the entire motor 2 is arranged below the drive shaft A1. The motor shaft 25 is rotatably supported by a bearing 251 fixed to the rear end of the speed reducer housing 30, which will be described later, and a bearing 253 fixed to the rear end of the outer housing 11. The front end of the motor shaft 25 projects into the speed reducer housing 30. A fan 27 for cooling the motor 2 is fixed to the rear end of the motor shaft 25.

Next, the transmission mechanism 3 will be described. As shown in FIG. 3, in the present embodiment, the transmission mechanism 3 is mainly composed of a planetary reducer 31, an intermediate shaft 33, and a nut drive gear 35. Hereinafter, these will be described in order.

The planetary reducer 31 is arranged on the downstream side of the motor 2 in the power transmission path from the motor 2 to the drive mechanism 4 (specifically, the ball screw mechanism 40) to increase the torque of the motor 2 to the intermediate shaft 33. It is configured to communicate. In the present embodiment, the planetary speed reducer 31 is mainly composed of two sets of planetary gear mechanisms and a speed reducer housing 30 accommodating them. The speed reducer housing 30 is made of resin and is fixedly held by the outer housing 11 on the front side of the motor 2. Since the configuration of the planetary gear mechanism itself is well known, detailed description thereof will be omitted here. The motor shaft 25 is used as an input shaft for rotational power to the planetary speed reducer 31. The sun gear 311 of the first (upstream side) planetary gear mechanism of the planetary reducer 31 is fixed to the front end portion of the motor shaft 25 (the portion protruding into the speed reducer housing 30). The carrier 313 of the second (downstream) planetary gear mechanism is the final output shaft of the planetary reducer 31.

The intermediate shaft 33 is configured to rotate integrally with the carrier 313. Specifically, the intermediate shaft 33 is arranged coaxially with the motor shaft 25, and its rear end is connected to the carrier 313. The front end and the rear end of the intermediate shaft 33 are rotatably supported by a bearing 331 fixed to the lower front end of the inner housing 13 and a bearing 333 fixed to the front end of the speed reducer housing 30.

The nut drive gear 35 is fixed to the outer peripheral portion of the front end portion of the intermediate shaft 33. The nut drive gear 35 meshes with a driven gear 411 formed on the outer peripheral portion of the nut 41, which will be described later, and transmits the rotational power of the intermediate shaft 33 to the nut 41. The nut drive gear 35 and the driven gear 411 are configured as a reduction gear mechanism. In this embodiment, the reduction ratio of the transmission mechanism 3 as a whole is 3 or less.

Hereinafter, the drive mechanism 4 will be described.

As shown in FIG. 3, in the present embodiment, the drive mechanism 4 is mainly composed of the ball screw mechanism 40 housed in the upper part of the outer housing 11. Hereinafter, the configuration of the ball screw mechanism 40 and its surroundings will be described in order.

Hereinafter, the ball screw mechanism 40 will be described.

As shown in FIGS. 3 and 4, the ball screw mechanism 40 is mainly composed of a nut 41 and a screw shaft 46. In the present embodiment, the ball screw mechanism 40 is configured to convert the rotational movement of the nut 41 into a linear movement of the screw shaft 46 and linearly move the jaw assembly 63 (see FIG. 5) described later.

The nut 41 is supported by the inner housing 13 in a state in which movement in the front-rear direction is restricted and the nut 41 can rotate around the drive shaft A1. The nut 41 is formed in a cylindrical shape and has a driven gear 411 integrally provided on the outer peripheral portion. The nut 41 is rotatably supported around the drive shaft A1 with respect to the inner housing 13 via a pair of radial bearings 412 and 413 fitted externally to the nut 41 on the front side and the rear side of the driven gear 411. ..

In the present embodiment, the inner housing 13 includes a front housing 131 that holds a front portion of the nut 41 (specifically, a portion in front of the driven gear 411) and a rear portion of the nut 41 (specifically, a driven gear). Includes a rear housing 133 that holds the 411 and the rear portion). The front housing 131 is formed so as to cover the front of the nut 41 and the outer periphery of the front portion of the nut 41. The rear housing 133 is formed so as to cover the rear of the nut 41 and the outer periphery of the driven gear 411 and the rear portion of the nut 41. In this way, by having the inner housing 13 having the portions arranged on the front side and the rear side of the nut 41, it is possible to more reliably regulate the movement of the nut 41 in the front-rear direction when the drive mechanism 4 operates. The front housing 131 and the rear housing 133 are integrated by being connected and fixed by screws (not shown) in the front-rear direction. The radial bearings 412 and 413 are fixed to the inside of the front housing 131 and the rear housing 133, respectively.

The outer shape of the portion covering the outer periphery of the nut 41 of the front housing 131 and the rear housing 133 is formed in a rectangular parallelepiped shape as a whole. The portion of the rear housing 133 corresponding to the driven gear 411 is provided with openings 134 on four surfaces, up, down, left and right. The diameter of the driven gear 411 is set so as to be substantially flush with the outer surface of the inner housing 13 through the opening 134 formed on the upper surface of the rear housing 133. That is, the outer circumference of the driven gear 411 is configured so as not to protrude upward from the upper surface of the inner housing 13. As a result, the so-called center height (distance from the drive shaft A1 to the upper surface of the outer housing 11) in the fastening tool 1 is reduced. The driven gear 411 meshes with the nut drive gear 35. As the driven gear 411 is rotated by the nut drive gear 35, the nut 41 is rotated around the drive shaft A1.

The screw shaft 46 is engaged with the nut 41 in a state in which rotation around the drive shaft A1 is restricted and the screw shaft 46 can move in the front-rear direction along the drive shaft A1. More specifically, as shown in FIGS. 3 and 4, the screw shaft 46 is configured as a long body and is inserted through the nut 41 so as to extend along the drive shaft A1. A large number of balls (not shown) are rotatably arranged in a spiral trajectory defined by a spiral groove formed on the inner peripheral surface of the nut 41 and a spiral groove formed on the outer peripheral surface of the screw shaft 46. Has been done. The screw shaft 46 is engaged with the nut 41 via these balls. As a result, the screw shaft 46 is linearly moved in the front-rear direction along the drive shaft A1 by the rotational drive of the nut 41.

As shown in FIG. 4, the central portion of the roller holding portion 463 is fixed to the rear end portion of the screw shaft 46. The roller holding portion 463 has an arm portion that projects left and right from the central portion orthogonal to the screw shaft 46. Rollers 464 are rotatably held at the left and right ends of the arm portion of the roller holding portion 463, respectively. On the other hand, roller guides 111 extending in the front-rear direction are fixed to the left and right inner wall portions of the outer housing 11 corresponding to the pair of left and right rollers 464, respectively. Although detailed illustration is omitted, the roller 464 is restricted from moving upward and downward by the roller guide 111. As a result, the roller 464 arranged in the roller guide 111 can roll in the front-rear direction along the roller guide 111.

In the ball screw mechanism 40 configured as described above, when the nut 41 is rotated around the rotation shaft A1, the screw shaft 46 engaged with the nut 41 via the ball moves in the front-rear direction with respect to the nut 41 and the housing 10. Moves in a straight line. A torque around the drive shaft A1 may act on the screw shaft 46 as the nut 41 rotates. However, when the roller 464 comes into contact with the roller guide 111, the screw shaft 46 is caused by the torque. Rotation around the drive shaft A1 is restricted.

Hereinafter, the configuration around the nut 41 inside the inner housing 13 will be described.

As shown in FIGS. 3 and 4, a thrust bearing 415 is arranged between the front end of the nut 41 and the front housing 131 in the front-rear direction. On the other hand, a thrust bearing 417, an intervening member 42, and an elastic member 43 are arranged between the rear end of the nut 41 and the rear housing 133. These members will be described in order.

The thrust bearing 415 is configured to allow the nut 41 to rotate while receiving a forward load acting on the nut 41 when the pin 81 of the fastener 8 is strongly pulled backward with respect to the main body 85. It is a bearing.

Although the details will be described later, the fastening tool 1 of the present embodiment is configured to be able to fasten a plurality of member crimping type fasteners other than the fastener 8 called a blind rivet by exchanging the nose portion 6. .. Similar to the fastener 8, the fasteners of the multi-member tightening type include a type fastener in which the pin tail is torn off (hereinafter referred to as a tear-off type fastener) and a type fastener in which the shaft portion of the pin is maintained as it is (hereinafter referred to as a shaft). There is a maintenance type fastener). If a shaft-maintaining fastener is used, the screw shaft 46 is moved rearward until the fastener collar is given the proper clamping force, after which the jaw assembly 63 (see FIG. 5) pins. It is moved forward while being gripped. At this time, in order to separate the collar firmly crimped to the tapered hole in the nose portion forward, a load acts on the nut 41 in the rearward direction. Therefore, a thrust bearing 417 is arranged to allow the nut 41 to rotate and receive a load in the rearward direction.

The intervening member 42 is arranged between the nut 41 and the rear end portion of the rear housing 133 in the front-rear direction. In the present embodiment, the intervening member 42 is formed as a cylindrical member having a flange portion 421 in the central portion, and is arranged in the rear housing 133 with the screw shaft 46 coaxially inserted. ..

The elastic member 43 is interposed between the flange portion 421 and the rear end portion of the rear housing 133 in the front-rear direction. In the elastic member 43, when the pin 81 of the fastener 8 is strongly pulled backward with respect to the main body 85 and the pin tail 813 is torn off, a strong force for moving the nut 41 relatively backward acts. In addition, the impact on the rear housing 133 is mitigated. In this embodiment, a rubber O-ring is used as the elastic member 43.

Further, the elastic member 43 is arranged between the flange portion 421 and the rear end portion of the rear housing 133 in a state where pressurization is applied (in a slightly compressed state). As a result, the intervening member 42 is always held at a position where the front surface of the flange portion 421 is in contact with the thrust bearing 417 and the rear surface is slightly forwardly separated from the front surface of the rear end portion of the rear housing 133. The distance between the rear surface of the flange portion 421 and the front surface of the rear end portion of the rear housing 133 at this time is the distance at which the intervening member 42 and the nut 41 can move rearward with respect to the rear housing 133 (in other words, , The upper limit of the compression amount of the elastic member 43) is specified.

Further, the cylindrical rear end portion of the intervening member 42 is slidably arranged in the through hole formed in the rear end portion of the rear housing 133. At all times, the rear end surface of the intervening member 42 is arranged at substantially the same position as the rear end surface of the rear housing 133 in the front-rear direction (that is, the rear end surface of the intervening member 42 and the rear end surface of the rear housing 133 are surfaces. It is said to be one). In the present embodiment, the inner housing 13 is made of aluminum, while the intervening member 42 is made of iron. Although details will be described later, the rear end portion of the intervening member 42 functions as a movement restricting portion (stopper) when the screw shaft 46 and the jaw assembly 63 have been moved forward beyond the initial position.

Hereinafter, the peripheral configuration of the rear end portion of the screw shaft 46 and the configuration inside the rear end portion of the outer housing 11 in which the rear end portion of the screw shaft 46 is arranged will be described.

As shown in FIG. 3, the magnet holding portion 485 is fixed to the roller holding portion 463 fixed to the rear end portion of the screw shaft 46. The magnet holding portion 485 is arranged on the upper side of the screw shaft 46, and the magnet 486 is attached to the upper end of the magnet holding portion 485. Since the magnet 486 is integrated with the screw shaft 46, it moves in the front-rear direction as the screw shaft 46 moves in the front-rear direction.

On the other hand, the outer housing 11 has a position detecting mechanism 48 configured to detect the relative position of the screw shaft 46 with respect to the housing 10 in the front-rear direction (also referred to as the position of the jaw assembly 63) via the magnet 486. It is provided. In this embodiment, the position detection mechanism 48 includes an initial position sensor 481 and a stop position sensor 482. When the initial position sensor 481 and the stop position sensor 482 are both electrically connected to the controller 156 (see FIG. 2) via wiring (not shown) and the magnet 486 is arranged within a predetermined detection range. It is configured to output a predetermined signal to the controller 156. The initial position sensor 481 is mounted at a position where the magnet 486 can be detected when the screw shaft 46 is placed in the initial position. The stop position sensor 482 is attached at a position where the magnet 486 can be detected when the screw shaft 46 is arranged at the stop position. In the present embodiment, the initial position is set near the frontmost position in the physically movable range of the screw shaft 46. The stop position is set to the rearmost position in the movable range of the screw shaft 46.

As shown in FIGS. 3 and 4, an extension shaft 47 is coaxially connected and fixed to the rear end portion of the screw shaft 46, and is integrated with the screw shaft 46. Hereinafter, the integrated screw shaft 46 and the extension shaft 47 are collectively referred to as a drive shaft 460. The drive shaft 460 is provided with a through hole 461 that penetrates the drive shaft 460 along the drive shaft A1. The diameter of the through hole 461 is set to be slightly larger than the maximum diameter of the pin tail of the fastener that can be used in the fastening tool 1.

An opening 114 that communicates the inside and the outside of the outer housing 11 is formed on the drive shaft A1 at the rear end of the outer housing 11. A cylindrical guide sleeve 117 having an inner diameter substantially equal to the outer diameter of the extending shaft 47 is fixed to the front side of the opening 114. The rear end of the extension shaft 47 (drive shaft 460) is arranged in the guide sleeve 117 when the screw shaft 46 (drive shaft 460) is arranged in the initial position (position shown in FIGS. 3 and 4). When the screw shaft 46 (drive shaft 460) is moved rearward from the initial position with the rotation of the nut 41, the extension shaft 47 moves rearward while sliding in the guide sleeve 117.

Further, as shown in FIGS. 3 and 4, the rear end portion of the outer housing 11 is provided with a container connecting portion 113 which is formed in a cylindrical shape and projects rearward. The container connecting portion 113 is configured so that the collection container 7 of the pin tail 813 can be attached and detached. As shown in FIGS. 2 and 4, the collection container 7 includes a cylindrical tubular member 71 and a bottomed tubular lid member 75 that can be attached to and detached from the tubular member 71 by screwing. A female screw is formed on the inner peripheral portion of the opening-side end of the tubular member 71. On the other hand, a male screw is formed on the outer peripheral portion of the container connecting portion 113. By screwing the tubular member 71 into the container connecting portion 113, the user can attach the collecting container 7 to the outer housing 11 so that the opening 114 and the internal space of the collecting container 7 communicate with each other. A male screw corresponding to the container connecting portion 113 is formed on the outer peripheral portion of the rear end portion of the tubular member 71, and the male screw is screwed on the inner peripheral portion of the opening side end portion of the lid member 75. A possible female thread is formed. That is, the lid member 75 is configured to be screwable not only to the tubular member 71 but also to the container connecting portion 113.

Hereinafter, the configurations of the nose portion 6 and the nose holding member 14 will be described.

First, the nose portion 6 will be described.

As shown in FIG. 5, the nose portion 6 is configured to be able to grip the anvil 61 configured to be in contact with the main body portion 85 (flange 853) of the fastener 8 and the pin 81 (pin tail 813) of the fastener 8. It is mainly composed of a jaw assembly 63 that is held so as to be relatively movable along the drive shaft A1 with respect to the anvil 61.

In the present embodiment, the nose portion 6 is detachably attached to the front end portion of the housing 10 via the nose holding member 14. As described above, the fastening tool 1 of the present embodiment is configured to be able to use a fastener 8 called a blind rivet and a fastener of a plurality of member crimping type. The user attaches an appropriate type of nose to the housing 10 according to the fastener actually used. In the present embodiment, the nose portion 6 for the fastener 8 is exemplified, but the nose portion corresponding to the fastener of the multi-member crimping type is also an anvil capable of contacting the tubular portion (also referred to as the collar) of the fastener. , It has basically the same configuration as the nose portion 6 in that it is configured so that the pin can be gripped and is provided with a jaw assembly that is held so as to be relatively movable along the drive shaft A1 with respect to the fastener contact portion. be able to. In the following, the direction of the nose portion 6 will be described with reference to the state in which the nose portion 6 is mounted on the housing 10.

Hereinafter, the anvil 61 will be described.

As shown in FIG. 5, in this embodiment, the anvil 61 includes a long cylindrical sleeve 611 and a nose tip 614 fixed to the front end of the sleeve 611. The inner diameter of the sleeve 611 is set to be substantially equal to the outer diameter of the jaw case 64 of the jaw assembly 63 described later. A locking rib 612 that projects radially outward is provided slightly behind the central portion of the outer peripheral portion of the sleeve 611. The nose tip 614 is arranged so that the front end portion can be brought into contact with the flange 853 of the fastener 8 and the rear end portion protrudes into the sleeve 611. The nose tip 614 is formed with an insertion hole 615 into which the pin tail 813 can be inserted.

The jaw assembly 63 will be described. As shown in FIG. 5, in the present embodiment, the jaw assembly 63 is mainly composed of a jaw case 64, a connecting member 641, a jaw 65, and an urging spring 66. Hereinafter, these members will be described in order.

The jaw case 64 is formed in a cylindrical shape that can slide in the sleeve 611 of the anvil 61 along the drive shaft A1 and can hold the jaw 65 inside. The jaw case 64 has a substantially uniform inner diameter, but only the front end portion is configured as a tapered portion whose inner diameter decreases toward the front. That is, the inner peripheral surface of the front end portion of the jaw case 64 is formed as a conical tapered surface whose diameter is reduced toward the front end. Further, the front end portion of the cylindrical connecting member 641 is screwed into the rear end portion of the jaw case 64 and integrated with the jaw case 64. The rear end portion of the connecting member 641 is configured to be screwable to the front end portion of the connecting member 49 described later.

The jaw 65 is formed as a conical tubular body corresponding to the tapered surface of the jaw case 64 as a whole, and is arranged coaxially with the jaw case 64 in the front end portion of the jaw case 64. The jaw 65 is configured to be able to grip a part of the pintail 813 and has a plurality of claws 651 (for example, three claws) arranged around the drive shaft A1. The inner peripheral surface of the claw 651 is formed with irregularities for facilitating gripping of the pin tail 813.

The urging spring 66 is interposed between the jaw 65 and the connecting member 641 in the front-rear direction. The jaw 65 is urged forward by the urging force of the urging spring 66, and the outer peripheral surface thereof is held in contact with the tapered surface of the jaw case 64. In this embodiment, the urging spring 66 is held by a spring holding member 67 arranged between the jaw 65 and the connecting member 641.

The spring holding member 67 includes a cylindrical first member 671 and a second member 675 that are slidably arranged along the drive shaft A1 in the jaw case 64. The first member 671 is arranged on the front side and abuts on the jaw 65, while the second member 675 is arranged on the rear side and abuts on the connecting member 641. The first member 671 and the second member 675 have an outer diameter smaller than the inner diameter of the jaw case 64, and each front end portion and rear end portion are provided with flanges protruding outward in the radial direction. The outer diameter of these flanges is substantially equal to the inner diameter of the jaw case 64 (the portion other than the tapered portion). The urging spring 66 is exteriorized on the first member 671 and the second member 675 with its front end and rear end in contact with the flanges of the first member 671 and the second member 675, respectively. A cylindrical sliding portion 672 projecting rearward is fixed inside the first member 671. The rear end portion of the sliding portion 672 is slidably inserted into the second member 675. The inner diameter of the sliding portion 672 is substantially equal to the through hole 461 of the screw shaft 46.

With the above configuration, when the jaw case 64 moves in the drive shaft A1 direction with respect to the anvil 61, the arrangement relationship between the jaw case 64 and the jaw 65 in the drive shaft A1 direction changes due to the urging force of the urging spring 66. To do. At this time, the claws 651 of the jaw 65 move in the drive shaft A1 direction while the tapered surface on the outer periphery thereof slides on the tapered surface of the jaw case 64, and the adjacent claws 651 approach or separate from each other. As a result, the gripping force of the pin tail 813 by the jaw 65 changes.

Specifically, when the screw shaft 46 and the jaw assembly 63 are arranged at the initial positions shown in FIG. 5, the jaw 65 has a jaw case in which the tapered surface on the outer periphery of the claw 651 abuts on the tapered surface of the jaw case 64. It is held in contact with the rear end of the nose tip 614 protruding into the front end of 64. In the present embodiment, the initial positions of the screw shaft 46 and the jaw assembly 63 are such that the fastener 8 does not fall off from the nose portion 6 due to its own weight when the claw 651 is inserted into the jaw 65 with the pin tail 813. It is adjusted so that the pin tail 813 can be loosely gripped by force.

When the jaw assembly 63 moves rearward with respect to the anvil 61 along the drive shaft A1, the jaw case 64 moves rearward with respect to the jaw 65 urged forward by the urging spring 66. By the action of the tapered surface of the claw 651 and the tapered surface of the jaw case 64, the plurality of claws 651 move so as to be close to each other. As a result, the pin tail 813 is firmly gripped by the jaw 65. On the contrary, when the jaw assembly 63 moves to the initial position along the drive shaft A1, the jaw 65 comes into contact with the rear end of the nose tip 614, and the jaw case 64 moves forward with respect to the jaw 65. The plurality of claws 651 move so as to be separated from each other. As a result, the grip of the pin tail 813 by the jaw 65 can be released. That is, the pintail 813 can be separated from the jaw 65. The fastening process using the fastening tool 1 will be described in detail later.

Hereinafter, the nose holding member 14 will be described.

As shown in FIG. 5, the nose holding member 14 is formed in a cylindrical shape and is fixed to the front end portion of the housing 10 so as to project forward along the drive shaft A1. More specifically, the nose holding member 14 is integrally connected to the housing 10 by being screwed into the cylindrical front end portion of the inner housing 13 (front housing 131). The inner diameter of the rear portion of the nose holding member 14 is set to be larger than the outer diameter of the screw shaft 46. Further, an annular locking portion 141 protruding inward in the radial direction is formed at the central portion of the nose holding member 14 in the front-rear direction. The inner diameter of the portion where the locking portion 141 is formed is set to be substantially equal to the outer diameter of the jaw assembly 63, and the inner diameter of the portion in front of the locking portion 141 is set to be substantially equal to the outer diameter of the anvil 61.

A connecting member 49 is connected to the front end of the screw shaft 46. The connecting member 49 is a member that connects the screw shaft 46 and the jaw assembly 63. The connecting member 49 is formed in a cylindrical shape, and is integrally connected to the screw shaft 46 by screwing its rear end portion into the front end portion of the screw shaft 46. The outer diameter of the rear end portion of the connecting member 49 is set to be substantially equal to the inner diameter of the nose holding member 14. An O-ring 491 for preventing grease leakage is mounted in an annular groove formed on the outer peripheral portion of the rear end portion of the connecting member 49. The connecting member 49 slides in the nose holding member 14 as the screw shaft 46 moves in the front-rear direction. The front end of the connecting member 49 is screwed into the rear end of the jaw assembly 63 (specifically, the connecting member 641). That is, the jaw assembly 63 is integrally connected to the screw shaft 46 via the connecting member 49. When the connecting member 49 is connected to the connecting member 641, a through hole 495 is formed so as to penetrate the connecting member 49 along the drive shaft A1. The diameter of the through hole 495 is substantially equal to the through hole 461 of the screw shaft 46.

The method of connecting the nose portion 6 to the housing 10 is as follows. After the jaw assembly 63 is connected to the connecting member 49 as described above, the rear end of the anvil 61 (specifically, the sleeve 611) is inserted into the nose holding member 14. Further, a cylindrical fixing ring 145 is screwed onto the outer peripheral portion of the front end portion of the nose holding member 14, so that the nose portion 6 is connected to the housing 10 via the nose holding member 14. The anvil 61 is positioned so that its rear end abuts on the locking portion 141 of the nose holding member 14 and the locking rib 612 is arranged between the front end of the fixing ring 145 and the front end of the nose holding member 14. ing.

When the nose portion 6 is connected to the housing 10 via the nose holding member 14, as shown in FIG. 2, the nose portion 6 extends along the drive shaft A1 from the tip of the nose portion 6 to the opening 114 of the outer housing 11. A passage 70 is formed. More specifically, the passage 70 includes an insertion hole 615 of the nose tip 614, an inside of the jaw 65, an inside of the spring holding member 67, a through hole 495 of the connecting members 641 and 49 (see FIG. 5), and a through hole of the drive shaft 460. A passage formed by 461 and an opening 114 (see FIG. 3). Although the details will be described later, the pintail 813 of the fastener 8 passes through the passage 70 and is housed in the collection container 7. The distance from the rear end of the guide sleeve 117 on which the rear end of the drive shaft 460 is arranged to the opening end of the opening 114 is set shorter than the length of the pintail 813. As a result, when the pin tail 813 is discharged from the through hole 461 with the drive shaft 460 arranged at the initial position, the pin tail 813 is prevented from coming off the passage 70 and entering the outer housing 11.

Hereinafter, the handle 15 and its peripheral configuration will be described.

As shown in FIG. 2, a trigger 151 is provided on the front side of the upper end portion of the handle 15. Inside the handle 15 on the rear side of the trigger 151, a switch 152 that is switched between an on state and an off state according to a pressing operation of the trigger 151 is housed. Further, around the trigger 151, a trigger guard 153 is provided to prevent an erroneous operation such as the trigger 151 coming into contact with something and being pressed. In the present embodiment, the trigger guard 153 extends from the front lower end of the outer housing 11 to the front end of the handle (specifically, the lower side of the trigger 151) while ensuring a space for arranging fingers on the front side of the trigger 151. doing.

In the present embodiment, the lighting unit 115 is provided at the front lower end portion of the outer housing 11. The lighting unit 115 of the present embodiment is mainly composed of a light emitting diode (LED) as a light source and a case made of a translucent material (transparent resin, glass, etc.) accommodating the LED. In the lighting unit 115, the irradiation direction of the light is set so that the light emitted by the LED illuminates the peripheral region of the front end portion of the fastener contact portion (in other words, the fastening work portion by the fastener 8). The lighting unit 115 is electrically connected to the controller 156 by a wiring (not shown). The trigger guard 153 has a passage for this wiring inside. That is, the trigger guard 153 has a function as a member for preventing an erroneous operation of the trigger 151 and a function as a passage for wiring.

The lower end of the handle 15 is formed in a rectangular box shape and constitutes the controller housing portion 155. A controller 156 that controls the operation of the fastening tool 1 is housed inside the controller housing unit 155. In this embodiment, as the controller 156, a control circuit composed of a microcomputer including a CPU, ROM, RAM, and the like is adopted. The controller 156 is connected to the switch 152, the lighting unit 115, the position detection mechanism 48, and the like by wiring (not shown).

A battery mounting portion 158 is provided below the controller accommodating portion 155. Further, an operation unit 157 that can be externally operated by the user is provided on the upper surface of the controller housing unit 155. As described above, in the present embodiment, the fastening tool 1 is configured to be compatible with both the tear-off type fastener including the fastener 8 and the shaft maintenance type fastener, and the controller 156 is the fastener to be used. The drive of the motor 2 is controlled according to the operation mode corresponding to the type of. Therefore, the operation unit 157 is provided with a button or the like capable of setting an operation mode and control conditions according to an external operation by the user.

Here, the arrangement relationship between specific mechanisms in the fastening tool 1 configured as described above will be described.

First, the arrangement relationship between the drive mechanism 4 (ball screw mechanism 40), the motor 2 and the handle 15 is as follows.

As shown in FIG. 3, in the vertical direction, the rotation shaft A2 of the motor shaft 25 extends below the drive shaft A1 in parallel with the drive shaft A1. That is, the motor 2 is not arranged coaxially with the drive mechanism 4. As a result, the housing 10 can be made more compact in the front-rear direction as compared with the case where the motor 2 is arranged coaxially with the drive mechanism 4. In particular, in the present embodiment, the entire motor 2 is arranged below the screw shaft 46 that moves along the drive shaft A1 to ensure compactness in the front-rear direction.

Further, as shown in FIG. 6, the virtual plane VP including the drive shaft A1 and the rotation shaft A2 of the motor shaft 25 passes through the center of the handle 15 in the left-right direction. In other words, the ball screw mechanism 40 including the nut 41 and the screw shaft 46, the motor 2, and the handle 15 are arranged symmetrically (planely symmetrical with respect to the virtual plane VP). As a result, a good weight balance is realized in the left-right direction, and the operability of the fastening tool 1 can be improved.

Further, as shown in FIG. 2, the trigger 151 provided at the upper end portion of the handle 15 is arranged between the nut 41 and the motor main body portion 20 in the front-rear direction. More specifically, in side view, at least a part of the trigger 151 is behind the rear end position of the nut 41, and at least a part of the trigger 151 is in front of the front end position of the motor body 20. In the present embodiment, the front end position of the trigger 151 is rearward of the rear end position of the driven gear 411, and the rear end position of the trigger 151 is forward of the front end position of the motor main body 20 in the side view. is there. In this way, since the trigger 151 is arranged between the relatively heavy nut 41 and the motor main body 20, a good weight balance is realized not only in the left-right direction but also in the front-rear direction, and the fastening tool 1 The operability of the can be further improved.

Further, in the front-rear direction, as shown in FIG. 2, the nut 41 and the motor main body 20 of the motor 2 are arranged at least at positions displaced in the front-rear direction. In the present embodiment, the nut 41 and the motor main body 20 are arranged apart from each other in the front-rear direction. That is, in the side view, the front end position of the motor body 20 is behind the rear end position of the nut 41. In this case, the trigger 151 can be moved upward, that is, closer to the drive shaft A1, and the operability of the fastening tool 1 can be further improved. In particular, in the present embodiment, as shown in FIG. 6, when the nut 41 and the motor 2 are viewed from the rear, the nut 41 and the motor 2 are arranged so as to partially overlap each other. More specifically, the motor 2 partially overlaps the lower part of the nut 41. The nut 41 referred to here includes a driven gear 411 provided on the nut 41. That is, it can be said that the outer shape of the driven gear 411 when viewed from the rear and the outer shape of the stator 21 of the motor 2 partially overlap. As a result, the housing 10 can be made compact in the vertical direction, and the trigger 151 can be reliably brought close to the drive shaft A1.

The arrangement relationship between the collection container 7 and the drive shaft A1 and the rotation shaft A2 of the motor shaft 25 is as follows.

As shown in FIG. 6, the collection container 7 is configured such that the drive shaft A1 and the rotation shaft A2 of the motor shaft 25 are located in the area occupied by the collection container 7 when viewed from the rear. As described above, in the present embodiment, the volume of the collection container 7 can be secured within a reasonable range corresponding to the rear end portion of the housing 10.

Hereinafter, the operation of the fastening tool 1 in the fastening process of the fastener 8 will be described.

As shown in FIGS. 2 and 5, at the beginning of the fastening process, the screw shaft 46 (ie, drive shaft 460) and jaw assembly 63 are in initial positions. The user inserts a part of the pin tail 813 of the fastener 8 into the inside of the jaw 65 through the insertion hole 615 of the nose tip 614, and loosely grips the jaw 65. Then, the sleeve 851 is inserted into the mounting hole formed in the work material W until the flange 853 comes into contact with one surface of the work material W to be fastened.

When the trigger 151 is pressed by the user and the switch 152 is turned on, the controller 156 lights the LED of the lighting unit 115 and further starts the forward rotation drive of the motor 2. The rotational power of the motor 2 is transmitted to the nut 41 via the transmission mechanism 3, and the nut 41 is rotated around the drive shaft A1 to move the screw shaft 46 rearward from the initial position. Along with this, the jaw assembly 63 connected to the screw shaft 46 is pulled backward, and the pintail 813 is firmly gripped by the jaw 65 and pulled backward along the drive shaft A1. At this time, a load in the forward direction acts on the nut 41, and the thrust bearing 415 receives the load.

As shown in FIG. 7, when the screw shaft 46 is further moved rearward, the pin 81 breaks at the small diameter portion 812 (see FIG. 1) before the screw shaft 46 reaches the stop position, and the fastener 8 to the pin tail 813 Be separated. A strong force that moves the nut 41 rearward relative to the inner housing 13 acts on the nut 41 due to the impact of breaking the pin 81. Therefore, a rear impact is applied to the rear housing 133. However, in the present embodiment, the elastic member 43 arranged behind the nut 41 and between the nut 41 and the rear housing 133 in the front-rear direction cushions this impact, so that the rear housing 133 is effective. Can be reduced to. Thereby, the durability of the housing 10 including the rear housing 133 can be enhanced.

In particular, in the present embodiment, the inner housing 13 that holds the nut 41 is formed by connecting the front housing 131 and the rear housing 133 in the front-rear direction. The inner housing 13 having such a configuration can be easily assembled with the nut 41 and the like. On the other hand, if the connection between the rear housing 133 and the front housing 131 is loosened due to the impact when the pin 81 is broken, the nut 41 can move in the front-rear direction, and the screw shaft 46 and the jaw assembly 63 can be moved back and forth. The directional position may shift and the pin 81 may not be properly gripped. However, in the present embodiment, the elastic member 43 reduces the impact on the rear housing 133, so that the looseness of the connection between the rear housing 133 and the front housing 131 can be effectively suppressed.

Further, as shown in FIG. 3, in the present embodiment, the elastic member 43 is arranged between the flange portion 421 of the intervening member 42 arranged behind the nut 41 and the rear housing 133. As a result, it is possible to prevent the elastic member 43 from being subjected to a force around the drive shaft A1 due to the rotation of the nut 41, and to improve the durability of the elastic member 43. Further, the elastic member 43 is held in a state where pressurization is applied between the flange portion 421 and the rear housing 133, and when the nut 41 moves rearward, the rear surface of the flange portion 421 becomes the rear housing 133. It contacts the front of the rear end and further movement is restricted. That is, the flange portion 421 of the intervening member 42 is configured to regulate the amount of rearward movement of the nut 41 with respect to the rear housing 133 (which can also be rephrased as the amount of compression of the elastic member 43). Due to the movement restriction by the flange portion 421, the durability of the elastic member 43 can be improved while maintaining the state in which the elastic member 43 reliably absorbs the impact.

Even after the pin 81 is broken, the motor 2 is continuously driven in the forward rotation, and the screw shaft 46 is further moved rearward while the separated pin tail 813 is gripped by the jaw 65. As shown in FIG. 8, when the screw shaft 46 reaches the stop position, the magnet 486 enters the detection range of the stop position sensor 482. The controller 156 stops the driving of the motor 2 in response to the output signal of the stop position sensor 482, thereby stopping the rearward movement of the screw shaft 46. As a result, the fastening process of the work material W by the fastener 8 is completed.

After that, when the pressing operation of the trigger 151 by the user is released and the switch 152 is turned off, the controller 156 turns off the LED of the lighting unit 115. Further, the controller 156 reversely drives the motor 2 and moves the screw shaft 46 forward until it is determined that the screw shaft 46 has reached the initial position based on the output signal of the initial position sensor 481. The screw shaft 46 and the jaw assembly 63 return to their initial positions, and the pintail 813 can be detached from the jaw 65. The passage 70 allows the passage of the pintail 813 pushed rearward by the pintail 813 of another fastener 8 in the subsequent fastening process. The collection container 7 accommodates the pintail 813 that has passed through the passage 70 and reached the collection container 7. In the present embodiment, since the passage 70 extends linearly along the drive shaft A1, the pintail 813 can smoothly pass through the passage 70. Further, since the collection container 7 can be attached to and detached from the rear end portion of the housing 10, the attachment and detachment operation is easier than when it is arranged in the intermediate portion of the housing 10.

By the way, in the present embodiment, the return of the screw shaft 46 to the initial position is performed based on the detection result of the initial position sensor 481, but if the initial position sensor 481 does not operate for some reason, the screw shaft 46 is in the initial position. It will be moved further forward beyond. In this case, in the present embodiment, the rear end surface of the intervening member 42 arranged flush with the rear end surface of the rear housing 133 comes into contact with the front end surface of the roller holding portion 463 provided on the screw shaft 46. It restricts the screw shaft 46 and the jaw assembly 63 from moving further forward. That is, the intervening member 42 functions as a stopper. As a result, the possibility that the screw shaft 46 and the jaw assembly 63 move forward beyond the limit and damage other parts (for example, the inner housing 13 and the outer housing 11) can be reduced. In the present embodiment, the roller holding portion 463 and the intervening member 42 are formed of iron having a strength higher than that of resin or aluminum, thereby reducing the possibility of damage to the roller holding portion 463 and the intervening member 42. The movement of the screw shaft 46 and the jaw assembly 63 is effectively regulated.

In the present embodiment, the operation of the fastening tool 1 has been described using the fastener 8 (blind rivet) which is an example of the tear-off type fastener, but the operation of the fastening tool 1 may also be used when the multiple member crimp-type tear-off type fastener is used. The operation of the fastening tool 1 is the same. Further, when a multi-member crimping type shaft maintenance type fastener is used, the controller 156 drives the motor 2 in the forward rotation until an appropriate crimping force is applied to the fastener collar to drive the screw shaft. After moving the 46 backward, the motor 2 is reversely driven to move the screw shaft 46 forward and return to the initial position.

The above embodiment is merely an example, and the fastening tool according to the present invention is not limited to the configuration of the illustrated fastening tool 1. For example, the changes illustrated below can be made. It should be noted that any one or more of these modifications may be adopted independently or in combination with the fastening tool 1 shown in the embodiment or the invention described in each claim.

When a tear-off type fastener such as the fastener 8 is used in the above-mentioned fastening tool 1, metal powder may be generated due to the breakage of the pin 81. The metal powder adheres to the separated pintail 813, is carried to the collection container 7 via the passage 70, and collects in the collection container 7 together with the pintail 813. This metal powder may adhere to the outer peripheral surface of the rear end portion of the drive shaft 460 (extended shaft 47) and enter the inside of the outer housing 11 through the opening 114. In addition to the metal powder, sand particles and the like may invade through the opening 114. Therefore, the fastening tool 1 is provided with a dustproof structure for preventing various foreign substances (dust) such as metal powder and sand particles from entering the accommodation area such as the drive mechanism 4 in the outer housing 11. You may. Hereinafter, with reference to FIGS. 9 to 12, two dustproof structures that can be added to the fastening tool 1 will be illustrated.

First, the dustproof structure according to the first modification will be described with reference to FIGS. 9 and 10.

As shown in FIG. 9, in the first modification, the front end portion of the cylindrical extension sleeve 118 is fitted to the rear end portion of the guide sleeve 117 arranged in the rear end portion of the outer housing 11. .. The extension sleeve 118 extends coaxially with the guide sleeve 117, and the rear end portion is inserted through the opening 114 and protrudes into the container connecting portion 113. In this modified example, contrary to the above embodiment, a female screw is formed on the inner peripheral portion of the container connecting portion 113, and the container connecting portion 113 is a male screw formed on the tubular portion 71. It is configured to screw. The inner diameter of the extension sleeve 118 is substantially equal to the outer diameter of the extension shaft 47. Further, a dustproof member 91 is arranged between the rear end portion of the guide sleeve 117 and the front end portion of the extension sleeve 118. In this modification, an annular member made of felt is used as the dustproof member 91. The inner diameter of the dustproof member 91 is slightly smaller than the outer diameter of the extension shaft 47, and the outer diameter is set to be substantially equal to the inner diameter of the rear end portion of the guide sleeve 117.

When the screw shaft 46 (drive shaft 460) is arranged in the initial position, as shown in FIG. 9, the rear end of the extension shaft 47 (drive shaft 460) is inserted into the dustproof member 91 and the extension sleeve is inserted. It is located in the front end of 118. That is, the rear end of the extension shaft 47 (drive shaft 460) is arranged behind the front end of the dustproof member 91. When the screw shaft 46 (drive shaft 460) is moved rearward to the stop position, the rear end of the extension shaft 47 (drive shaft 460) is slightly from the rear end of the extension sleeve 118, as shown in FIG. It is placed in a position that protrudes backward.

The dustproof member 91 is arranged so as to slide with respect to the outer peripheral surface of the extension shaft 47 while the screw shaft 46 (drive shaft 460) moves in the front-rear direction between the initial position and the stop position. As a result, when the rear end portion of the extension shaft 47 (drive shaft 460) moves into the outer housing 11, the metal powder adhering to the outer peripheral surface of the dustproof member 91 invades forward of the dustproof member 91. Can be prevented. Further, the dustproof member 91 prevents other foreign matters (dust) that have entered through the opening 114 (extended sleeve 118) from entering in front of the dustproof member 91 when the collection container 7 is not attached. can do. As a result, it is possible to prevent malfunctions of the internal mechanism (for example, drive mechanism 4, transmission mechanism 3, motor 2, position detection mechanism 48) caused by dust.

The dustproof structure according to the second modification will be described with reference to FIGS. 11 and 12.

In the second modification, the guide sleeve 117 of the above embodiment is not arranged at the rear end portion of the outer housing 11. Further, the extension shaft 47 is formed longer than that of the above embodiment, and when the screw shaft 46 (drive shaft 460) is arranged at the initial position, as shown in FIG. 11, the extension shaft 47 (drive) The rear end of the shaft 460) is inserted into the opening 114. At this time, the rear end of the extension shaft 47 (drive shaft 460) is arranged near the opening end (rear end) of the opening 114. Therefore, when the screw shaft 46 (drive shaft 460) is moved rearward to the stop position, the rear end of the extension shaft 47 (drive shaft 460) protrudes into the collection container 7 as shown in FIG. Placed in position.

In this modification, the wall portion forming the rear end portion of the outer housing 11 is formed with an annular space portion 119 surrounding the opening 114. In the space portion 119, a dustproof member 93 is arranged in a state of being sandwiched from the front side and the rear side by two annular washers 94 fitted in the space portion 119. In this modification, an annular member made of felt is used as the dustproof member 93. In this modification, the inner diameter of the dustproof member 93 is set to be slightly smaller than the outer diameter of the extension shaft 47, and the outer diameter is set to be smaller than the outer diameter of the space portion 119. This allows the dustproof member 93 to move slightly in the radial direction following the extension shaft 47 (drive shaft 460) even if the extension shaft 47 (drive shaft 460) is slightly tilted with respect to the drive shaft A1 while improving the assembling property. ing.

Like the dustproof member 91, the dustproof member 93 also slides with respect to the outer peripheral surface of the extension shaft 47 while the screw shaft 46 (drive shaft 460) moves in the front-rear direction between the initial position and the stop position. Is located in. As a result, the dustproof member 93 prevents metal powder and other foreign matter (dust) adhering to the outer peripheral surface of the rear end portion of the extension shaft 47 (drive shaft 460) from entering in front of the dustproof member 93. Can be prevented.

In the first modification and the second modification, the dustproof members 91 and 93 configured as an annular member made of felt are exemplified, but the material of the dustproof members 91 and 93 is not particularly limited to felt. Absent. For example, rubber, non-woven fabric, paper, sponge and the like can be adopted. Further, the shapes of the dustproof members 91 and 93 are not particularly limited to the annular shape. For example, a brush-shaped member or the like surrounding the outer peripheral surface of the moving member can be adopted.

Hereinafter, other modifications will be described.

For example, in the above embodiment, the fastening tool 1 can be used for both a tear-off type fastener and a shaft-maintaining type fastener by exchanging the nose portion 6. However, the fastening tool 1 may be configured as a dedicated machine that supports only a tear-off type fastener. In this case, the thrust bearing 417 (see FIG. 3) arranged behind the nut 41 may be omitted. Then, the intervening member 42 may be arranged so as to abut on the rear end surface of the nut 41, and the elastic member 43 may be sandwiched between the intervening member 42 and the rear end portion of the rear housing 133. In this case, it is preferable that the intervening member 42 is arranged so as not to rotate around the drive shaft A1 and receives the rear end surface of the nut 41 while allowing the nut 41 to rotate. The elastic member 53 is provided mainly for shock mitigation caused by the breakage of the pin, which is premised in the fastening process of the tear-off type fastener, but for some reason, the breakage of the pin of the shaft-maintaining type fastener is caused. In consideration of the possibility of occurrence, it may be provided in a dedicated machine that supports only the shaft maintenance type fastener.

Further, the configuration for alleviating the impact on the rear housing 133 acting via the nut 41 when the pin 81 is broken is not limited to the elastic member 43 (see FIG. 3) configured as a rubber O-ring. In other words, the material and shape of the elastic member 43 may be changed as appropriate. For example, a plurality of rubber members may be arranged in the circumferential direction around the drive shaft A1. Instead of rubber, elastic synthetic resin or spring may be adopted. The configuration of the intervening member 42 may also be changed as appropriate. Further, the elastic member 43 may be arranged between the nut 41 and the rear housing 133 in the front-rear direction, and the arrangement relationship between the nut 41, the intervening member 42, the elastic member 43, and the rear housing 133 is as follows. It may be changed as appropriate. For example, the elastic member 43 may be sandwiched between the nut 41 and the flange portion 421 of the intervening member 42 from the front and back. In this case, in order to ensure the durability of the elastic member 43, the intervening member 42 is rotatably arranged around the drive shaft A1 with respect to the rear housing 133, and the elastic member 43 and the intervening member 42 can rotate together with the nut 41. It is preferable that

In the above embodiment, when the screw shaft 46 moves forward beyond the initial position, the roller holding portion 463 fixed to the screw shaft 46 comes into contact with the rear end portion of the intervening member 42, so that the screw shaft 46 moves. Is regulated. That is, the intervening member 42 is used as the movement restricting portion of the screw shaft 46. However, the movement restricting portion of the screw shaft 46 may be composed of a member other than the intervening member 42. Further, the contact portion on the screw shaft 46 side that contacts the movement restricting portion is not limited to the roller holding portion 463. It is preferable that the movement restricting portion of the screw shaft 46 and the contact portion on the screw shaft 46 side are both made of a metal having relatively high strength.

The configurations of the motor 2, the transmission mechanism 3, and the drive mechanism 4 may be changed as appropriate. For example, a motor with a brush may be adopted as the motor 2, or an AC motor may be adopted. For example, the reduction ratio of the entire transmission mechanism 3 and the number of planetary gear mechanisms of the planetary speed reducer 31 may be changed as appropriate. Further, instead of the ball screw mechanism 40 provided with the nut 41 and the screw shaft 46 that engages with the nut via the ball, a nut having a female screw formed on the inner peripheral portion and a male screw formed on the outer peripheral portion are formed. , A feed screw mechanism with a screw shaft screwed directly onto the nut may be employed.

In the above embodiment, in order to detect that the screw shaft 46 (drive shaft 460) and the jaw assembly 63 are arranged at specific positions (specifically, the initial position and the stop position), the initial position sensor 481 and the jaw assembly 63 are used. A position detection mechanism 48 including a stop position sensor 482 is provided. Instead of the position detection mechanism 48, a position detection mechanism using a mechanical switch may be adopted instead of the magnetic sensor. Further, one sensor or switch may be adopted instead of the initial position sensor 481 and the stop position sensor 482. For example, even if a sensor or switch capable of detecting that the screw shaft 46 (drive shaft 460) and the jaw assembly 63 are arranged at a predetermined origin position different from the initial position or the stop position in the front-rear direction is adopted. Good. In this case, the controller 28 stops driving the motor 2 based on the number of rotations of the motor 2 and the number of drive pulses counted after it is detected that the screw shaft 46 is arranged at the origin position. The screw shaft 46 (drive shaft 460) and jaw assembly 63 can be placed in predetermined initial or stop positions. The rotation speed of the motor 2 may be detected by, for example, a Hall IC.

The inner housing 13 does not necessarily have to be formed from the front housing 131 and the rear housing 133. The inner housing 13 may be formed of a left housing covering the left side portion of the nut 41 and a right housing covering the right side portion, or an upper housing covering the upper portion of the nut 41 and a lower housing covering the lower portion. It may be formed of. Further, the housing 10 does not necessarily have to be composed of the outer housing 11 and the inner housing 13, and may be configured as a single housing.

The correspondence between each component of the above embodiment and its modification and each component of the present invention is shown below. The fastener 8 is a configuration example corresponding to the "fastener" of the present invention. The pin 81 and the main body 85 are configuration examples corresponding to the “pin” and the “cylindrical portion” of the present invention, respectively. The small diameter portion 812 and the pin tail 813 are configuration examples corresponding to the “small diameter portion” and the “pin tail” of the present invention, respectively. The working material W is a configuration example corresponding to the "working material" of the present invention.

The fastening tool 1 is a configuration example corresponding to the "fastening tool" of the present invention. The drive shaft A1 is an example corresponding to the "drive shaft" of the present invention. The housing 10 is a configuration example corresponding to the "housing" of the present invention. The anvil 61 is a configuration example corresponding to the "fastener contact portion" of the present invention. The jaw assembly 63 is a configuration example corresponding to the “pin grip portion” of the present invention. The motor 2 is a configuration example corresponding to the "motor" of the present invention. The drive mechanism 4 is a configuration example corresponding to the "drive mechanism" of the present invention. The inner housing 13 is a configuration example corresponding to the "rotating member holding portion" of the present invention. The nut 41 and the drive shaft 460 are configuration examples corresponding to the "rotating member" and the "moving member" of the present invention, respectively. The elastic member 43 is a configuration example corresponding to the “elastic member” of the present invention.

The front housing 131 and the rear housing 133 are configuration examples corresponding to the "front member" and the "rear member" of the present invention, respectively. The flange portion 421 of the intervening member 42 is a configuration example corresponding to the “intervening member” of the present invention. The initial position sensor 481 of the position detection mechanism 48 is a configuration example corresponding to the “position detection mechanism” of the present invention. The initial position is an example corresponding to the "predetermined reference position" and the "predetermined initial position" of the present invention. The rear end portion of the intervening member 42 is a configuration example corresponding to the “movement restricting portion” of the present invention. The roller holding portion 463 is a configuration example corresponding to the “contact portion” of the present invention. The flange portion 421 of the intervening member 42 is a configuration example corresponding to the “movement amount regulating portion” of the present invention. The through hole 461 is a configuration example corresponding to the "internal passage" of the present invention. The opening 114 is a configuration example corresponding to the “opening” of the present invention. The recovery container 7 is a configuration example corresponding to the “recovery container” of the present invention. Each of the dustproof members 91 and 93 is a configuration example corresponding to the "dustproof member" of the present invention.

Further, in view of the purpose of the present invention, the above-described embodiment and its modifications, the following aspects are constructed. The following embodiments may be adopted alone or in combination with the fastening tool 1 shown in the embodiment, the above modifications, or the invention described in each claim.
[Aspect 1]
The fastening tool further includes a control unit configured to control the operation of the drive mechanism by controlling the drive of the motor.
The control unit may be configured to arrange the pin gripping unit at the initial position by controlling the drive of the motor based on the detection result of the position detection mechanism.
[Aspect 2]
A fastening tool configured to fasten a work material via a fastener provided with a pin and a tubular portion.
A housing extending in the front-rear direction of the fastening tool along a predetermined drive shaft,
A fastener contact portion held at the front end portion of the housing so as to be able to contact the tubular portion, and a fastener contact portion.
A pin gripping portion that is held so as to be relatively movable in the front-rear direction along the drive shaft with respect to the fastener contact portion and that can grip a part of the pin.
By moving the pin grip portion rearward with respect to the fastener contact portion along the drive shaft, the pin gripped by the pin grip portion was pulled and brought into contact with the fastener contact portion. It is provided with a drive mechanism configured to deform the tubular portion, thereby fastening the working material via the fastener, and breaking the pin at a small diameter portion for breaking.
The drive mechanism
A rotating member that is supported by the housing and is rotationally driven by the power of the motor in a state in which movement in the front-rear direction is restricted and is rotatable around the drive shaft.
Rotation of the rotating member by engaging with the rotating member in a state of being connected to the pin gripping portion, restricting rotation around the drive shaft, and being movable in the front-rear direction along the drive shaft. It is provided with a moving member configured to move linearly in the front-rear direction by driving.
The moving member is configured as a hollow member extending in the front-rear direction along the drive shaft and having an internal passage through which a pintail separated by breakage can pass.
The rear end of the housing has an opening formed so as to communicate the internal passage with the outside of the housing, and the pintail collection container discharged through the opening is detachably configured. Ori,
The fastening tool further includes a dustproof member held in the rear end portion of the housing so as to come into contact with the outer peripheral surface of the rear end portion of the moving member.
The dustproof member is arranged so as to prevent the outer peripheral surface from sliding with respect to the dustproof member and invading dust in front of the dustproof member when the moving member moves in the front-rear direction. Fastening tool characterized by being
[Aspect 3]
The rear end of the moving member may be arranged behind the front end of the dustproof member.

1: Fastening tool 10: Housing 11: Outer housing 111: Roller guide 113: Container connecting part 114: Opening 115: Lighting unit 117: Guide sleeve 118: Extension sleeve 119: Space part 13: Inner housing 131: Front housing 133 : Rear housing 134: Opening 14: Nose holding member 141: Locking part 145: Fixing ring 15: Handle 151: Trigger 152: Switch 153: Trigger guard 155: Controller housing part 156: Controller 157: Operating part 158: Battery Mounting part 159: Battery 2: Motor 20: Motor body 21: Stator 23: Rotor 25: Motor shaft 251: Bearing 253: Bearing 27: Fan 3: Transmission mechanism 30: Reducer housing 31: Planetary reducer 311: Sun gear 313: Carrier 33: Intermediate shaft 331: Bearing 333: Bearing 35: Nut drive gear 4: Drive mechanism 40: Ball screw mechanism 41: Nut 411: Driven gear 412: Radial bearing 413: Radial bearing 415: Thrust bearing 417: Thrust bearing 42 : Intervening member 421: Flange portion 43: Elastic member 46: Screw shaft 460: Drive shaft 461: Through hole 463: Roller holding portion 464: Roller 47: Extension shaft 48: Position detection mechanism 481: Initial position sensor 482: Stop position Sensor 485: Magnet holding part 486: Magnet 49: Connecting member 491: O ring 495: Through hole 6: Nose part 61: Anvil 611: Sleeve 612: Locking rib 614: Nose tip 615: Insertion hole 63: Jaw assembly 64: Jaw case 641: Connecting member 65: Jaw 651: Claw 66: Biasing spring 67: Spring holding member 671: First member 672: Sliding part 675: Second member 7: Recovery container 70: Passage 71: Cylindrical member 75 : Lid member 8: Fastener 81: Pin 811: Shaft part 812: Small diameter part 813: Pin tail 815: Head 85: Main body part 851: Sleeve 853: Flange 91: Dustproof member 93: Dustproof member 94: Washer A1: Drive shaft A2: Rotating axis VP: Virtual plane W: Working material

Claims (8)

A fastening tool configured to fasten a work material via a fastener provided with a pin and a tubular portion.
A housing extending in the front-rear direction of the fastening tool along a predetermined drive shaft,
A fastener contact portion held at the front end portion of the housing so as to be able to contact the tubular portion, and a fastener contact portion.
A pin gripping portion that is held so as to be relatively movable in the front-rear direction along the drive shaft with respect to the fastener contact portion and that can grip a part of the pin.
With the motor
Driven by the power of the motor, the pin grip portion is moved rearward with respect to the fastener contact portion along the drive shaft to pull the pin gripped by the pin grip portion and pull the fastener. A drive mechanism configured to deform the tubular portion abutted on the abutting portion and thereby fasten the work material via the fastener is provided.
The housing includes a rotating member holder.
The drive mechanism
A rotating member that is supported by the rotating member holding portion and is rotationally driven by the power of the motor in a state in which movement in the front-rear direction is restricted and is rotatable around the drive shaft. When,
Rotation of the rotating member by engaging with the rotating member in a state of being connected to the pin gripping portion, restricting rotation around the drive shaft, and being movable in the front-rear direction along the drive shaft. A moving member configured to move linearly in the front-rear direction by driving,
An intervening member arranged between the rotating member and the rotating member holding portion in the front-rear direction,
An elastic member is provided behind the rotating member and interposed between the intervening member and the rotating member holding portion .
The intervening member is configured to be movable in the front-rear direction with respect to the rotating member holding portion.
A fastening tool characterized in that the distance between the intervening member and the rotating member holding portion defines an upper limit of the amount of compression of the elastic member .

A fastening tool configured to fasten a work material via a fastener provided with a pin and a tubular portion.
A housing extending in the front-rear direction of the fastening tool along a predetermined drive shaft,
A fastener contact portion held at the front end portion of the housing so as to be able to contact the tubular portion, and a fastener contact portion.
A pin gripping portion that is held so as to be relatively movable in the front-rear direction along the drive shaft with respect to the fastener contact portion and that can grip a part of the pin.
With the motor
Driven by the power of the motor, the pin grip portion is moved rearward with respect to the fastener contact portion along the drive shaft to pull the pin gripped by the pin grip portion and pull the fastener. A drive mechanism configured to deform the tubular portion abutted on the abutting portion and thereby fasten the work material via the fastener is provided.
The housing includes a rotating member holder.
The drive mechanism
A rotating member that is supported by the rotating member holding portion and is rotationally driven by the power of the motor in a state in which movement in the front-rear direction is restricted and is rotatable around the drive shaft. When,
Rotation of the rotating member by engaging with the rotating member in a state of being connected to the pin gripping portion, restricting rotation around the drive shaft, and being movable in the front-rear direction along the drive shaft. A moving member configured to move linearly in the front-rear direction by driving,
An intervening member arranged between the rotating member and the rotating member holding portion in the front-rear direction,
An elastic member is provided behind the rotating member and between the intervening member and the rotating member holding portion in a state in which transmission of the rotational force of the rotating member is blocked. Fastening tool. The fastening tool according to claim 1 or 2.
A fastening tool characterized in that the intervening member has a flange portion, and the elastic body is intervened and arranged between the flange portion and the rotating member holding portion. The fastening tool according to any one of claims 1 to 3 .
A fastening tool characterized in that the rotating member holding portion is configured to hold the rotating member in the front-rear direction. The fastening tool according to claim 4 .
The rotating member holding portion is characterized in that a front member that holds the rotating member from the front and a rear member that holds the rotating member from the rear are connected to each other in the front-rear direction. Fastening tool. The fastening tool according to any one of claims 1 to 5 .
Further comprising a position detecting mechanism configured to detect that the pin grip has been placed at a predetermined reference position.
After fastening the working material, the drive mechanism moves the pin grip portion forward with respect to the fastener contact portion along the drive shaft based on the detection result of the position detection mechanism, and determines a predetermined value. It is configured to be placed in the initial position
When the pin gripping portion connected to the moving member is moved forward beyond the initial position, the intervening member abuts on the abutting portion provided on the moving member, whereby the moving member A fastening tool comprising a movement restricting portion configured to restrict the forward movement of the pin gripping portion.
The fastening tool according to any one of claims 1 to 6.
The drive mechanism is configured to fasten the work material via the fastener and break the pin at a small diameter portion for breaking.
The fastening tool is characterized in that the moving member is configured as a hollow member extending in the front-rear direction along the drive shaft and having an internal passage through which a pintail separated by breakage can pass. The fastening tool according to claim 7.
The rear end of the housing has an opening formed so as to communicate the internal passage of the moving member with the outside of the housing, and the collection container of the pintail discharged through the opening can be attached and detached. Is composed of
The fastening tool further includes a dustproof member held at the rear end of the housing so as to come into contact with the outer peripheral surface of the rear end of the moving member.
The dustproof member is arranged so as to prevent the outer peripheral surface from sliding with respect to the dustproof member and invading dust in front of the dustproof member when the moving member moves in the front-rear direction. Fastening tool characterized by being

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