WO2019054257A1 - Outil de fixation - Google Patents

Outil de fixation Download PDF

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Publication number
WO2019054257A1
WO2019054257A1 PCT/JP2018/032944 JP2018032944W WO2019054257A1 WO 2019054257 A1 WO2019054257 A1 WO 2019054257A1 JP 2018032944 W JP2018032944 W JP 2018032944W WO 2019054257 A1 WO2019054257 A1 WO 2019054257A1
Authority
WO
WIPO (PCT)
Prior art keywords
fastening tool
motor
pin
shaft
anvil
Prior art date
Application number
PCT/JP2018/032944
Other languages
English (en)
Japanese (ja)
Inventor
俊人 藪名香
洋規 生田
教定 薮口
佑樹 河合
Original Assignee
株式会社マキタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社マキタ filed Critical 株式会社マキタ
Publication of WO2019054257A1 publication Critical patent/WO2019054257A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/022—Setting rivets by means of swaged-on locking collars, e.g. lockbolts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/26—Drives for riveting machines; Transmission means therefor operated by rotary drive, e.g. by electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/28—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups

Definitions

  • the present invention relates to a fastening tool for fastening a work material by means of a fastener provided with a pin and a collar.
  • a fastener having a pin (which may also be referred to as a bolt) and a collar which are separately formed from each other is known as a fastener for closely attaching and fixing a plurality of working materials.
  • a fastener for closely attaching and fixing a plurality of working materials In fastening the working material by such a fastener, first, the pin is inserted into the mounting hole formed in the working material, and the collar is engaged with the shaft of the pin. Thereafter, a region including the end of the shaft opposite to the head is gripped and pulled in the axial direction by the fastening tool, and the head and the collar sandwich the working material, and the inner periphery of the collar is The collar is crimped to the shaft so as to be crimped to a plurality of caulking grooves formed in the shaft. From this, the fastener of the above configuration is also referred to as a multi-piece swage type fastener.
  • the first type of fastener includes a pin having a breaking groove formed in the shaft different from the clamping groove.
  • the portion of the shaft opposite to the head with respect to the break groove is generally referred to as a pin tail.
  • the second type of fastener has no break groove in the shank and includes a short pin as compared to the first type.
  • the fastening of the working material by the second type of fastener after the collar is crimped to the shaft, the fastening is completed while the end area gripped by the fastening tool is integral with the shaft. That is, it is not assumed that the pin breaks.
  • the first type and the second type may also be referred to, for example, as breakable (or tear-off, pin-tail separated), non-breakable (or axial maintenance), respectively.
  • WO 2002/023056 discloses a fastening tool for fastening work material using non-breaking fasteners.
  • the fastening tool comprises a pin grip capable of gripping an end area of the pin shank and an anvil engageable with a collar, and using a fluid pressure to move a piston disposed in the cylinder The anvil is moved axially with respect to the rotating nut member. This causes the anvil to press the collar and clamp the collar on the shank.
  • the above-described fastening tool for non-rupturing fasteners terminates the movement of the anvil based on the back pressure generated in the fluid with the progress of the caulking. Since this fastening tool performs output control using fluid pressure, output control is easy, but simplification of the device configuration is difficult.
  • the present invention relates to a fastening tool for fastening a working material by a non-rupturing multiple member fastening type fastener, and an object thereof is to provide a technique that can contribute to simplification of the device configuration. .
  • a fastening tool for fastening a work material by a non-rupturing multi-member clamp fastener including a pin including a shaft and a head and a collar separately formed from the pin. Be done.
  • the shank of the pin includes a caulking area in which the caulking groove is formed and an end area in which the tension groove is formed.
  • the head of the pin is integrally formed at one end on the caulking area side of the shaft.
  • the collar is formed in a cylindrical shape and is configured to be engageable with the shaft portion.
  • the fastening tool includes an anvil, a pin gripping portion, a motor, and a drive mechanism.
  • the anvil is configured to be engageable with the collar.
  • the pin grip portion is arranged to be movable relative to the anvil along a drive shaft extending in the front-rear direction of the fastening tool. Further, the pin gripping portion is configured to be able to grip the end region by engaging with the pulling groove.
  • the drive mechanism is driven by the power of the motor and is configured to move the pin grip in the front-rear direction with respect to the anvil.
  • the drive mechanism moves the pin gripping portion in a state of gripping the end portion region of the shaft portion from the initial position to the rear, whereby the collar engaged with the shaft portion is moved by the anvil to the caulking groove of the shaft portion. It is configured to perform a caulking process. And a caulking process is complete
  • the fastening tool according to this aspect, a configuration is adopted in which the pin gripping portion that grips the end region of the shaft of the pin is moved relative to the anvil that can be engaged with the collar along the drive shaft by the power of the motor. It is done. Thereby, simplification of an apparatus structure is realizable compared with a fastening tool using fluid pressure. In addition, since the caulking process ends when the pin gripping portion is substantially incapable of moving backward, detailed power management of the motor can be eliminated.
  • the anvil may be engageable with the collar of the multi-component clamp fastener, and the configuration thereof is not particularly limited.
  • the anvil is typically configured as a metal bed that deforms the collar by a clamping force and is formed as a tubular body with a bore.
  • the bore includes a tapered portion which gradually expands in diameter toward the open end where the collar is inserted, and has a diameter smaller than the outer diameter of the crimped region of the collar.
  • the pin gripping portion moves rearward relative to the anvil, the collar abuts against the inner circumferential surface of the tapered portion and is pressed axially and radially inward, squeezed and deformed while in the anvil bore. It is going to get in.
  • the collar is crimped to the shaft in a state of being crimped to the caulking groove, and the working material is fastened by the head of the pin and the collar.
  • the pin gripping portion may be disposed so as to be movable in the front-rear direction along the drive shaft with respect to the anvil, and may be configured to be able to grip the end region of the shaft of the pin. is not.
  • any known configuration with a tip referred to as a jaw can be employed.
  • the jaws typically have a plurality of claws that can grip the shank by engaging a pulling groove formed in the end area.
  • the configuration of the jaws (the number and shape of the claws, etc.) can be appropriately set in accordance with the configuration of the end region (for example, the number and the shape of the tension grooves).
  • the pin grips are typically arranged coaxially with the anvil, inside the tubular anvil.
  • either one of the anvil and the pin grip portion is held by the housing by being directly or via another member connected to the housing (also referred to as a tool body).
  • the anvil and the pin grip may be configured to be removable from the housing.
  • the motor may be a direct current motor or an alternating current motor, and the presence or absence of a brush is not particularly limited. However, from the viewpoint of small size and large output, it is preferable to employ a brushless DC motor.
  • any configuration capable of moving the pin grip portion in the front-rear direction with respect to the anvil can be adopted by the power of the motor.
  • a feed screw mechanism or a ball screw mechanism can be suitably adopted.
  • the feed screw mechanism and the ball screw mechanism are both motion conversion mechanisms capable of converting rotational motion into linear motion.
  • the female screw formed on the inner peripheral surface of the cylindrical rotating member and the male screw formed on the outer peripheral surface of the moving member inserted in the rotating member are directly engaged with each other. (Screw up).
  • 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 into the rotating member.
  • the rotating member is held in the housing via the bearing, while the moving member is directly or indirectly coupled to the pin grip.
  • the moving member may be rotatably supported by the housing, and the rotating member may be directly or indirectly coupled to the pin grip.
  • the fastening tool is a fastener wherein the end region of the shank is located opposite the tensioning groove and the clamping region with respect to the tensioning groove and is larger than the diameter of the bottom of the tensioning groove.
  • the work material may be configured to be fastened by a fastener including an end portion formed in a diameter.
  • the fastening tool may further comprise a controller configured to control the drive of the motor.
  • the control unit may be configured to stop the driving of the motor by determining that the caulking process has ended when the motor decelerates and the rotational speed of the motor falls below a predetermined threshold.
  • the control unit may stop the driving of the motor when the motor is substantially in the locked state as a result of the pin gripping unit becoming incapable of moving backward.
  • the control unit can appropriately determine that the caulking process has ended, and can stop driving of the motor.
  • the drive mechanism may include a motion conversion mechanism configured to convert rotational motion into linear motion and move the pin grip in the back and forth direction relative to the anvil.
  • the fastening tool may further include a torque limiter provided on a transmission path for transmitting torque from the motor to the motion conversion mechanism.
  • the torque limiter is configured to cut off the transmission of torque when a torque exceeding a predetermined threshold acts.
  • a caulking process may be ended by operation of a torque limiter. According to this aspect, by interrupting the transmission of torque before the motor reaches the lock state completely, the load on the motor can be reduced, and heat generation of the motor can be suppressed.
  • the fastening tool may further include an adjustment member configured to be able to adjust the threshold according to the external operation of the user.
  • the torque at which the motor reaches a locked state may vary depending on factors such as, for example, the specifications of the fastener and the work material. According to this aspect, it is possible for the user to adjust the threshold value of the torque limiter appropriately in accordance with such a factor.
  • the fastening tool may comprise a rotary tool and an attachment removably mounted to the rotary tool.
  • the rotary tool is a tool configured to rotationally drive the final output shaft by the power of the motor.
  • the drive mechanism may include a motion conversion mechanism.
  • the motion conversion mechanism may be configured to convert the rotational motion of the final output shaft into linear motion and to move the pin grip in the back and forth direction with respect to the anvil.
  • the attachment may include a motion conversion mechanism, a pin grip, and an anvil.
  • the drive mechanism may include a planetary reducer configured to increase the torque of the motor for transmission to the final output shaft.
  • the motor, the planetary gear, the final output shaft, and the motion conversion mechanism may be coaxially arranged.
  • the rotary tool may be a driver drill.
  • fastener It is a perspective view of a fastening tool. It is a longitudinal cross-sectional view of a fastening tool. It is a fragmentary sectional view of a driver drill. It is a cross-sectional view of a fastening tool. It is a longitudinal cross-sectional view of an attachment. It is a cross-sectional view of an attachment. It is a perspective view of a movement conversion mechanism, a connection shaft, and a nose part. It is a block diagram which shows the electric constitution of a fastening tool.
  • the fastening tool 1 configured to fasten the working material using the non-rupturing multi-piece swage type fastener 9 is exemplified.
  • the fastener 9 shown in FIG. 1 is a multi-component caulking fastener including a pin 91 and a collar 95 formed separately from the pin 91. More specifically, the fastener 9 is a so-called non-breaking (or shaft maintaining) fastener among multiple-member clamp fasteners.
  • the pin 91 includes a rod-like shaft portion 910 and a head 917 formed at one end of the shaft portion 910.
  • the shaft portion 910 includes a caulking area 911 having a constant diameter and a tensile area 914 having a smaller diameter than the caulking area 911.
  • the tension area 914 constitutes an end area of the shaft 910 opposite to the head 917.
  • the caulking area 911 is a portion of the shaft portion 910 other than the tension region 914 (that is, a portion between the tension region 914 and the head 917), and occupies most of the shaft portion 910.
  • the caulking area 911 is an area where the collar 95 can be caulked, and has a caulking groove 912.
  • the caulking groove 912 is an annular groove, and a plurality of caulking grooves 912 are provided over the entire length of the caulking region 911.
  • the pulling region 914 is a portion gripped and pulled by a pin gripping portion 63 (specifically, the jaw 630) described later.
  • the axial length of the tension area 914 is shorter than that of the caulking area 911.
  • the pulling region 914 includes an end 916 including the tip 919 (the end opposite to the head 917) of the shank 910 and a single pulling groove 915 formed between the end 916 and the caulking region 911. Including.
  • the end 916 has a constant diameter slightly smaller than the diameter of the crimped area 911. However, the diameter of the end 916 does not have to be constant.
  • the ratio of the maximum diameter of the end 916 to the maximum diameter of the caulking area 911 is, for example, in the range of 0.7 to 1.0.
  • the tension groove 915 has a central portion having a constant diameter smaller than the diameter of the end portion 916, a tapered portion connecting the central portion and the caulking area 911 and a tapered portion connecting the central portion and the end portion 916 Including. That is, the tension groove 915 is a groove having a trapezoidal cross section.
  • the ratio of the minimum diameter (that is, the diameter of the central portion) of the tension groove 915 to the maximum diameter of the caulking region 911 is, for example, in the range of 0.5 to 0.78.
  • the collar 95 is formed in a cylindrical shape, and is configured to be engageable with the shaft portion 910 of the pin 91. At one end portion of the outer peripheral portion of the collar 95, a flange 951 that protrudes radially outward is formed. The outer peripheral portion other than the flange 951 constitutes an engaging portion 953 which engages with a tapered portion 617 (see FIG. 6) of the anvil 61 described later in the fastening operation.
  • the engagement portion 953 is a caulking region of the collar 95 that is deformed by the caulking force applied by the anvil 61.
  • the inner diameter of the collar 95 is set slightly larger than the diameter of the shaft portion 910 of the pin 91.
  • the fastening tool 1 mainly includes a driver drill 2 and an attachment 5. More specifically, the fastening tool 1 of this embodiment is a tool in which an attachment 5 having a motion conversion mechanism 51 and a nose portion 6 is connected to a known driver drill 2 configured to rotationally drive a tip tool. It corresponds to
  • the driver drill 2 includes a main body portion 21 and a handle portion 27.
  • the main body 21 extends along a predetermined drive axis A1.
  • a motor 31 and a spindle 35 rotationally driven by power of the motor 31 are accommodated.
  • the motor 31 and the spindle 35 are coaxially arranged along the drive shaft A1.
  • a chuck 37 to which a tip tool (typically, a tip tool for a screw tightening operation or a drilling operation) can be attached and detached is coaxially connected to the tip of the spindle 35.
  • the chuck 37 protrudes from one end of the main body 21 along the drive shaft A1.
  • the handle portion 27 projects from the main body portion 21 in a direction (generally perpendicular direction) intersecting the drive axis A1.
  • the proximal end of the handle portion 27 is provided with a trigger 273 which can be pressed by the user.
  • a rechargeable battery 279 is removably mounted on the protruding end of the handle portion 27 via the battery mounting portion 275.
  • the attachment 5 is formed in a long shape as a whole.
  • the attachment 5 is connected to the driver drill 2 so as to extend along the drive axis A1 and to cover a part of the chuck 37 and the main body 21.
  • the attachment 5 is configured to be removable from the driver drill 2.
  • the extending direction of the drive shaft A 1 is defined as the front-rear direction of the fastening tool 1 for convenience of explanation.
  • the side on which the attachment 5 is disposed is defined as the front side, and the opposite side (the side on which the motor 31 is disposed) is defined as the rear side.
  • a direction perpendicular to the drive shaft A1 and corresponding to the extending direction of the handle portion 27 is defined as the vertical direction.
  • the side where the handle portion 27 is connected to the main body portion 21 is defined as the upper side
  • the battery mounting portion 275 side of the handle portion 27 is defined as the lower side.
  • a direction perpendicular to the front-rear direction and the vertical direction is defined as the left-right direction.
  • driver drill 2 will be described with reference to FIGS. 3 to 5. As described above, in the present embodiment, since the known driver drill 2 is employed, the configuration thereof will be briefly described.
  • the main body portion 21 includes a main body housing 211, a motor 31, a gear assembly 32, a chuck 37, and a clutch mechanism 4.
  • the body housing 211 is formed as a bottomed cylindrical hollow body closed at the rear end and open at the front end.
  • a motor 31 is accommodated in the rear end portion of the main body housing 211.
  • a gear assembly 32 is disposed on the front side of the motor 31. The gear assembly 32 is connected to the main housing 211 in a state in which the front portion of the gear assembly 32 protrudes forward from the front end of the main housing 211.
  • a small-sized high-output brushless DC motor is employed as the motor 31.
  • the motor 31 has a stator 311, a rotor 312, and a motor shaft 313 that rotates with the rotor 312.
  • the motor 31 is disposed such that the motor shaft 313 extends on the drive shaft A1.
  • the gear assembly 32 includes a gear case 321, a planetary reduction gear 33 housed in the gear case 321, and a spindle 35.
  • the gear case 321 is configured by a first gear case 322 disposed on the front side, and a second gear case 327 coupled to the rear side of the first gear case 322.
  • the first gear case 322 includes a large diameter portion 323, a small diameter portion 324, and a shoulder portion 325.
  • the large diameter portion 323 constitutes a rear portion of the first gear case 322.
  • the small diameter portion 324 is smaller in diameter than the large diameter portion 323, and constitutes a front portion of the first gear case 322.
  • the shoulder 325 connects the large diameter portion 323 and the small diameter portion 324.
  • the rear wall portion of the second gear case 327 rotatably supports the front end portion of the motor shaft 313 via a bearing.
  • the planetary reduction gear 33 is disposed coaxially with the motor 31 in the gear case 321.
  • the planetary reduction gear 33 is configured as a reduction mechanism including a three-stage planetary gear mechanism.
  • the planetary reduction gear 33 increases the torque input from the motor shaft 313 and outputs the torque to the spindle 35 as the final output shaft of the driver drill 2.
  • the spindle 35 is rotatably supported around the drive shaft A1 by a bearing disposed in the small diameter portion 324 of the first gear case 322. The front end of the spindle 35 projects forward from the front end of the first gear case 322.
  • the chuck 37 is screwed to the front end portion of the spindle 35 so as to be self-tight, and is held off by a bolt 371.
  • the chuck 37 is thereby integrated coaxially with the spindle 35.
  • the chuck 37 is provided with a plurality of claws (not shown).
  • the chuck 37 is configured such that the claws open when rotated in a predetermined direction around the drive axis A1 (when the chuck 37 is loosened) and close when rotated in the opposite direction (when the chuck 37 is tightened). .
  • the tip tool and the connection shaft 55 of the attachment 5 described later are attached and detached.
  • the main body portion 21 is provided with a clutch mechanism 4.
  • the clutch mechanism 4 is provided on a torque transmission path from the motor 31 to the spindle 35.
  • the clutch mechanism 4 is configured as a torque limiter that interrupts torque transmission when a torque exceeding a predetermined threshold acts.
  • the clutch mechanism 4 is provided between the planetary reduction gear 33 and the spindle 35 on the torque transmission path, and the torque transmitted from the planetary reduction gear 33 to the spindle 35 exceeds a threshold. , Shut off the transmission of torque.
  • the clutch mechanism 4 for example, the same configuration as that of the clutch mechanism disclosed in Japanese Patent Application Laid-Open No. 2012-218088 can be adopted. Briefly described, the clutch mechanism 4 includes a spring support 41, a torque adjustment ring 43, a washer 45, a coil spring 47, and a plurality of engagement pins 49 (see FIG. 5).
  • the spring support portion 41 is connected to the front end portion of the small diameter portion 324 so as to be movable in the front-rear direction along the drive shaft A1 and incapable of rotating around the drive shaft A1.
  • the spring support portion 41 is formed as a bottomed cylindrical member, and has an external thread portion on the outer periphery.
  • the torque adjustment ring 43 is rotatably coupled to the front end of the small diameter portion 324 about the drive shaft A1, and can be rotated by the user.
  • the torque adjustment ring 43 has an internal thread portion on its inner periphery and is screwed to the spring support portion 41.
  • the washer 45 is disposed on the front side of the shoulder portion 325 of the first gear case 322.
  • the coil spring 47 is compressed, and the small diameter portion 324 is encased in a state in which both end portions abut on the bottom portion of the spring support portion 41 and the washer 45 respectively.
  • a plurality of through holes extending in the front-rear direction are formed at equal intervals in the circumferential direction.
  • the plurality of engagement pins 49 are respectively inserted into these through holes.
  • the front end abuts on the rear surface of the washer 45, and the rear end is the third stage of the planetary reduction gear 33 (the frontmost, or the most downstream side in the torque transmission path) internal gear It is in contact with the front of 330.
  • the front gear of the internal gear 330 is provided with cam projections that project forward at equal intervals in the circumferential direction as many as the engagement pins 49.
  • the engagement pin 49 is pressed against the front surface of the internal gear 330 via the washer 45 by the biasing force of the coil spring 47, and engages with the cam protrusion in the circumferential direction. Regulate the rotation.
  • the amount of compression of the coil spring 47 changes as the spring support 41 screwed to the torque adjustment ring 43 moves in the front-rear direction. That is, the pressing force of the engagement pin 49 by the coil spring 47 is adjusted.
  • the load on the spindle 35 increases as the screwing proceeds.
  • the load on the spindle 35 exceeds the pressing force of the coil spring 47 which regulates the rotation of the internal gear 330 (that is, when the torque exceeding the threshold corresponding to the pressing force of the coil spring 47 acts)
  • the cam projection of the internal gear 330 The engagement pin 49 is pushed forward to relatively ride over the cam protrusion, and the internal gear 330 is idled. Thereby, the torque transmission from the planetary reduction gear 33 to the spindle 35 is interrupted.
  • the mode switching ring 328 is rotatably mounted on the large diameter portion 323 of the first gear case 322 around the drive shaft A1.
  • the mode switching ring 328 is disposed between the large diameter portion 323 and the torque adjustment ring 43, and can be rotated by the user.
  • the user can switch the operation mode of the driver drill 2 by rotating the mode switching ring 328.
  • two types of operation modes of the driver drill 2 are prepared: a screw tightening mode in which the clutch mechanism 4 operates and a drill mode in which the clutch mechanism 4 does not operate.
  • the configuration for mode switching is known, and thus detailed description thereof will be omitted. However, for example, a configuration similar to that disclosed in JP 2012-218088 A can be employed.
  • the handle portion 27 includes a handle housing 271.
  • the handle housing 271 is integrally formed with the main body housing 211 and forms an outer shell of the handle portion 27.
  • a switch 274 is accommodated in the upper end portion of the handle housing 271.
  • the switch 274 is always maintained in the off state, and is switched to the on state in conjunction with the pull operation of the trigger 273.
  • the battery mounting portion 275 is provided at the lower end portion of the handle portion 27.
  • a controller 277 that controls the driver drill 2 such as drive control of the motor 31 is accommodated.
  • the controller 277 is configured as a microcomputer including a CPU, a ROM, a RAM, a non-volatile memory (EEPROM), and the like.
  • the switch 274 is connected to the controller 277 by a wire not shown, and outputs a signal indicating the on state or the off state to the controller 277.
  • the attachment 5 includes a motion conversion mechanism 51, a connection shaft 55, a nose portion 6, and a connection housing 50. 6 and 7, although the attachment 5 is illustrated in a state removed from the driver drill 2 for convenience of explanation, the attachment 5 is attached to the driver drill 2 with respect to the direction of the attachment 5. It is defined based on (see FIG. 3 and FIG. 5).
  • the motion conversion mechanism 51 is configured to convert the rotational motion of the chuck 37 (spindle 35) of the driver drill 2 into a linear motion.
  • the motion conversion mechanism 51 mainly includes a nut 53 and a screw shaft 54.
  • the nut 53 is a cylindrical member having an internal thread on its inner circumferential surface.
  • the nut 53 is held by the sleeve 52 so as to be rotatable around the drive shaft A1.
  • the sleeve 52 is configured as a stepped cylindrical member. More specifically, the sleeve 52 includes a large diameter portion 521, a small diameter portion 525, and a shoulder portion 528.
  • the large diameter portion 521 constitutes a rear portion (portion disposed on the driver drill 2 side) of the sleeve 52.
  • the small diameter portion 525 is smaller in diameter than the large diameter portion 521, and constitutes a front portion of the sleeve 52.
  • the shoulder portion 528 connects the large diameter portion 521 and the small diameter portion 525.
  • the outer peripheral surface of the large diameter portion 521 has a pair of flat portions 522.
  • the pair of flat portions 522 is provided symmetrically in parallel with the drive axis A1 with the drive axis A1 interposed therebetween.
  • the cross-sectional shape of the large diameter portion 521 is not a circle but a double D shape.
  • the small diameter portion 525 is formed with a pair of grooves 526.
  • the pair of grooves 526 extends symmetrically from the front end to the rear of the small diameter portion 525 in parallel with the drive axis A1 with the drive axis A1 interposed therebetween.
  • the nut 53 is rotatably supported in the front end of the large diameter portion 521 of the sleeve 52.
  • a thrust bearing 531 is disposed between the nut 53 and the shoulder portion 528.
  • the thrust bearing 531 receives an axial force (thrust load) acting on the nut 53 while allowing the rotation of the nut 53 when the screw shaft 54 is pulled rearward.
  • two engaging convex portions 537 are formed at the rear end portion of the nut 53.
  • the engagement convex portion 537 is a convex portion that protrudes rearward, and is configured to be engageable with an engagement concave portion 557 of the connection shaft 55 described later.
  • the two engaging convex portions 537 extend linearly to the outer edge of the nut 53 with the through hole of the nut 53 interposed therebetween. Further, as shown in FIG. 6, an annular recess 534 is formed in the center of the rear end of the nut 53 (around the through hole) to be recessed forward.
  • the screw shaft 54 is a long cylindrical member and has an external thread on the outer peripheral surface.
  • the screw shaft 54 is restricted in rotation around the drive shaft A1 and engaged with the nut 53 in a movable state in the direction of the drive shaft A1 (front-rear direction). More specifically, the screw shaft 54 engages with the nut 53 in a state where the male screw portion is screwed to the female screw portion of the nut 53, and extends in the direction of the drive shaft A1.
  • a cylindrical sliding portion 541 is fixed to a central portion in the front-rear direction of the screw shaft 54.
  • the sliding portion 541 is configured to slide in the small diameter portion 525 of the sleeve 52.
  • the sliding portion 541 is provided with a pair of engagement pins 542 projecting into a pair of grooves 526 provided in the small diameter portion 525.
  • the diameter of the engagement pin 542 is approximately equal to the width of the groove 526, and the engagement pin 542 is slidable along the groove 526 in the front-rear direction.
  • a locking flange 544 projecting radially outward from the outer periphery is provided at the rear end portion of the screw shaft 54.
  • the locking flange 544 is configured to be engageable with the recess 534 at the rear end of the nut 53.
  • the locking flange 544 and the recess 534 function as a stopper that prohibits the forward movement of the screw shaft 54, and defines the foremost position (also referred to as an initial position) of the screw shaft 54 and the pin gripping portion 63.
  • a cylindrical connecting member 546 is fixed to the front end of the screw shaft 54.
  • the connecting member 54 has an external thread on the outer peripheral surface.
  • the pin gripping portion 63 is connected to the connecting member 546.
  • the sleeve 52, the nut 53, the thrust bearing 531, the screw shaft 54, the sliding portion 541, and the connection member 546 are assembled in advance to constitute a single motion conversion unit 510.
  • the connecting shaft 55 is attachable to the chuck 37 of the driver drill 2 and engageable with the nut 53.
  • the connection shaft 55 is a member for transmitting the torque of the chuck 37 (spindle 35) to the nut 53.
  • the connecting shaft 55 includes a chuck engaging portion 551 and a nut engaging portion 555.
  • the chuck engaging portion 551 is a shaft portion that constitutes a rear portion of the connecting shaft 55.
  • the chuck engaging portion 551 is attachable to the chuck 37 and has a diameter larger than the locking flange 544 of the screw shaft 54.
  • the nut engaging portion 555 is a portion on the front side of the chuck engaging portion 551 and has a diameter substantially equal to that of the nut 53 larger than the chuck engaging portion 551.
  • the chuck engaging portion 551 and the nut engaging portion 555 are integrally formed.
  • an engaging recess 557 engageable with the engaging convex portion 537 of the nut 53 described above is formed. More specifically, the engagement recess 557 is configured as a groove having a rectangular cross-section, which linearly extends along the diameter of the nut engagement portion 555.
  • the connecting shaft 55 has a shaft insertion hole 559 extending from the front end to the central portion of the chuck engaging portion 551.
  • the diameter of the shaft insertion hole 559 is slightly larger than the diameter of the locking flange 544 of the screw shaft 54.
  • the rear end portion of the screw shaft 54 is disposed in the shaft insertion hole 559.
  • the screw shaft 54 is moved in the front-rear direction in the shaft insertion hole 559 in accordance with the rotation of the nut 53. Therefore, the depth (length in the front-rear direction) of the shaft insertion hole 559 is the movable distance of the screw shaft 54. It is set larger than.
  • the nose portion 6 is a pulling mechanism (clinching mechanism) configured to grip and pull the pin 91 of the fastener 9 (see FIG. 1) and clamp the collar 95 to the shaft portion 910 of the pin 91.
  • the nose portion 6 includes an anvil 61 and a pin gripping portion 63.
  • the anvil 61 is configured to be engageable with the collar 95 of the fastener 9. More specifically, as shown in FIGS. 6 and 7, the anvil 61 is configured as an elongated cylindrical sleeve having a bore.
  • the inner diameter (bore diameter) of the rear side portion of the anvil 61 is formed to be approximately the same diameter as the outer diameter of the base portion 632 of the pin gripping portion 63 described later.
  • the inner diameter of the front portion of the anvil 61 is smaller in diameter than the rear portion.
  • a shoulder portion 613 having a surface substantially orthogonal to the drive axis A1 is formed at a portion where the inner diameter in the anvil 61 changes.
  • the front end of the front portion of the anvil 61 is formed as a tapered portion 617.
  • the inner diameter of the tapered portion 617 gradually expands toward the opening end (front end).
  • the tapered portion 617 is set to be longer than the height of the engaging portion 953 of the collar 95 in the front-rear direction.
  • the inner diameter of the tapered portion 617 is set to be slightly larger than the outer diameter of the engaging portion 953 at the open end, but smaller than the outer diameter of the engaging portion 953 at the rear of the open end.
  • the anvil 61 is connected to the connection housing 50 through the fixing ring 508 in a state where the rear end is inserted into the front end (nose holding portion 507) of the connection housing 50 described later and extends along the drive shaft A1. It is fixed.
  • the fixing ring 508 is a cylindrical member having an internal thread formed on the inner circumferential surface.
  • the pin gripping portion 63 is configured to be able to grip the shaft portion 910 (specifically, the pulling area 914) of the pin 91 of the fastener 9.
  • the pin grip portion 63 is disposed so as to be movable relative to the anvil 61 in the front-rear direction along the drive shaft A1. More specifically, as shown in FIGS. 6 and 7, the pin gripping portion 63 is disposed coaxially with the anvil 61 in the bore of the anvil 61, and is slidable in the bore along the drive axis A1.
  • the pin gripping portion 63 includes a jaw 630 and a base 632 integrally formed with the jaw 630.
  • the jaws 630 are configured to be able to grip the pulling area 914 of the shank 910. More specifically, the jaws 630 have a plurality of claws (eg, three claws) 631 capable of gripping the tension area 914. The claws 631 are arranged at equal intervals in a virtual circumferential shape centered on the drive axis A1. Further, the jaws 630 are configured such that the distance between the adjacent claws 631 spreads toward the front end. The length in the front-rear direction of the jaw 630 is set such that the front end of the claw 631 projects forward from the front end of the tapered portion 617 of the anvil 61 when the pin gripping portion 63 is disposed at the initial position.
  • the length in the front-rear direction of the jaw 630 is set such that the front end of the claw 631 projects forward from the front end of the tapered portion 617 of the anvil 61 when the pin gripping portion 63 is disposed at the initial position.
  • the base portion 632 is formed in a bottomed cylindrical shape whose front end is closed. Further, on the inner peripheral surface of the rear end portion of the base portion 632, a female screw portion that can be screwed to the male screw portion of the connection member 546 is formed.
  • the pin grip portion 63 is integrally connected to the screw shaft 54 via the connection member 546 by the base 632 being screwed to the front end portion of the connection member 546.
  • the gripping force by the jaws 630 increases as the jaws 630 are drawn into the anvil 61 and moved rearward.
  • connection housing 50 will be described below. As shown in FIG. 3, the connection housing 50 is formed as a cylindrical member that gradually narrows forward, and has a stepped through hole extending in the front-rear direction.
  • the connection housing 50 is configured to receive the motion conversion mechanism 51 (the motion conversion unit 510) described above and to hold the nose portion 6. Further, the connection housing 50 is configured to be fixable to the main body 21 (specifically, the first gear case 322) of the driver drill 2 so as to cover the chuck 37 of the driver drill 2 and the front end of the main body 21.
  • the connection housing 50 has a main body cover portion 501, a chuck cover portion 503, a motion conversion unit accommodation portion 504, and a nose holding portion 507 from the rear side.
  • the main body cover portion 501 is a substantially cylindrical portion that constitutes the rear end portion of the connection housing 50.
  • the main body cover portion 501 is configured to be fittable to the outer periphery of the large diameter portion 323 of the first gear case 322, and has two through holes on the left and right side portions. On the other hand, two screw holes are formed on the left and right sides of the large diameter portion 323, respectively.
  • the connection housing 50 is connected and fixed to the main housing 211 by screwing the screw 502 inserted through the through hole of the main body cover portion 501 into the screw hole of the large diameter portion 323. With the connection housing 50 connected to the main body housing 211, the main body cover portion 501 covers the front end portion of the main body portion 21.
  • the chuck cover portion 503 is a portion continuous with the front of the main body cover portion 501 and has an inner diameter slightly larger than the outer diameter of the chuck 37.
  • the chuck cover portion 503 is disposed so as to cover the outside of the chuck 37 in a non-contact state with the chuck 37 in a state where the connection housing 50 is connected to the main body housing 211.
  • the motion conversion unit housing portion 504 is a portion that is continuous with the front of the chuck cover portion 503, and is configured to be engageable with the outer periphery of the sleeve 52 of the motion conversion mechanism 51. .
  • the inner diameter of the rear portion of the motion conversion unit housing portion 504 is set larger than the inner diameter of the front portion corresponding to the sleeve 52 configured as a stepped cylindrical member.
  • the cross-sectional shape of the through hole in the rear portion of the motion conversion unit housing portion 504 is not circular but double, corresponding to the large diameter portion 521 of the sleeve 52 having a pair of flat portions 522 (see FIG. 6) It has a D shape. For this reason, when the large diameter portion 521 is fitted to the rear side portion of the motion conversion unit housing portion 504, the rotation of the sleeve 52 with respect to the connection housing 50 is restricted.
  • the nose holding portion 507 is a portion that is continuous with the front side of the motion conversion unit housing portion 504, and constitutes a front end portion of the connection housing 50.
  • the inner diameter of the nose holding portion 507 is set to be substantially equal to the outer diameter of the anvil 61.
  • a male screw portion that can be screwed to the female screw portion of the fixing ring 508 is formed.
  • the attachment 5 is assembled in the following procedure, for example, and mounted on the driver drill 2.
  • the pin gripping portion 63 is screwed into and fixed to the connection member 546 of the motion conversion unit 510. Further, the connecting shaft 55 is separately attached to the chuck 37 of the driver drill 2 via the chuck engaging portion 551. In the large diameter portion 521 of the sleeve 52, the engagement convex portion 537 of the nut 53 is engaged with the engagement concave portion 557 of the connecting shaft 55. Then, the connection housing 50 is mounted from the front so as to cover the pin grip portion 63, the motion conversion unit 510, the chuck 37, and the front end portion of the main body portion 21.
  • connection housing 50 is fixed to the main body housing 211 by a total of four screws 502.
  • the anvil 61 is inserted from the front end of the connection housing 50 (nose holding portion 507) and fitted to the outside of the pin grip portion 63.
  • the fixing ring 508 is screwed to the outer peripheral portion of the nose holding portion 507, whereby the anvil 61 is connected to the connection housing 50.
  • a locking rib 618 projecting radially outward from the outer periphery is provided at the central portion in the front-rear direction of the anvil 61.
  • an annular flange portion that protrudes radially inward is provided.
  • the locking rib 618 is disposed between the front end of the connection housing 50 (the front end of the nose holding portion 507) and the flange portion of the fixing ring 508, whereby the longitudinal position of the anvil 61 is defined.
  • the fastening tool 1 is configured by attaching the attachment 5 to the driver drill 2 in this manner.
  • the rotational movement of the chuck 37 (spindle 35) of the driver drill 2 is transmitted to the movement converting mechanism 51 via the connection shaft 55, converted into linear movement, and transmitted to the pin gripping portion 63.
  • the motor 31, the planetary reduction gear 33, the spindle 35 (chuck 37), and the motion conversion mechanism 51 are arranged coaxially (along the drive axis A1).
  • the electrical configuration of the fastening tool 1 will be described.
  • the electrical configuration of the fastening tool 1 corresponds to the electrical configuration of the driver drill 2.
  • the fastening tool 1 includes a controller 277, a three-phase inverter 315, and a hall sensor 316.
  • the three-phase inverter 315 includes a three-phase bridge circuit using six semiconductor switching elements.
  • the three-phase inverter 315 performs switching operation of each switching element in accordance with the duty ratio indicated by the control signal from the controller 277 to supply the motor 31 with a pulse current (drive pulse) corresponding to the duty ratio.
  • Hall sensor 316 includes three Hall elements arranged corresponding to each phase of motor 31.
  • the hall sensor 316 is a rotational position sensor of the motor 31 and outputs a pulse signal to the controller 277 every time the rotor 312 reaches a predetermined rotational position (that is, every time the motor 31 rotates a predetermined amount). It is configured.
  • a current detection amplifier 317 is electrically connected to the controller 277.
  • the current detection amplifier 317 converts the drive current of the motor 31 into a voltage by the shunt resistor, and further outputs a signal amplified by the amplifier to the controller 277.
  • the switch 274 of the trigger 273 is electrically connected to the controller 277.
  • the controller 277 appropriately controls the drive of the motor 31 (that is, the operation of the drive mechanism) based on the signals output from the Hall sensor 316, the switch 274, and the like.
  • the fastening process in the present embodiment includes a caulking process and a return process.
  • the caulking process is a process in which the pin gripping portion 63 is moved rearward from the initial position, and the collar 95 is caulked on the shaft portion 910 of the pin 91 by the anvil 61.
  • the return step is a step in which the pin gripping portion 63 is returned forward to the initial position after the caulking step.
  • the user inserts the shaft portion 910 of the pin 91 into the mounting hole formed in the work material W so that the head 917 is in contact with one surface of the work material W, as shown in FIG. 1. .
  • the user engages the collar 95 loosely with the shaft 910 from the opposite side of the work material W.
  • the user further engages the pulling area 914 projecting from the collar 95 with the pin gripping portion 63 of the attachment 5, as shown in FIG. More specifically, the user pulls the jaws 630 in a tension groove such that the pawl 631 at least abuts the tapered portion connecting the central portion and the end portion 916 when the pin gripping portion 63 is pulled rearward.
  • Engage 915 engages the jaws 630 in a tension groove such that the pawl 631 at least abuts the tapered portion connecting the central portion and the end portion 916 when the pin gripping portion 63 is pulled rearward.
  • the planetary reduction gear 33, the spindle 35, the chuck 37, and the motion conversion mechanism 51 function as a drive mechanism that performs the caulking process by moving the pin gripping portion 63 rearward with respect to the anvil 61 as a whole.
  • the direction of rotation of the motor 31 when moving the pin gripping portion 63 (screw shaft 54) is the same positive direction as when screwing work or drilling work is performed by the driver drill 2.
  • the pin 91 is firmly gripped by the jaw 630 and pulled rearward.
  • the collar 95 enters the tapered portion 617 (see FIG. 7) of the anvil 61 while reducing its diameter.
  • the pin gripping portion 63 is moved rearward, the collar 95 is strongly pressed forward and radially inward by the anvil 61 and is pressed against the shaft portion 910 so as to be in a state of being crimped to the caulking groove 912. Be tightened.
  • the typical fastener 9 used in the fastening tool 1 relatively breaks or breaks the pin 91 at the tension groove 915 even when the tension area 914 is strongly pulled, as described above. , The end 916 is separated), and the pin gripping portion 63 is not easily detached. Then, the fastening tool 1 can generate a torque sufficient to exert a tensile force (axial force) which allows the pin gripping portion 63 to securely clamp the collar 95 to the shaft portion 910, and at the maximum. Even when a torque is generated, the tensile force of the pin gripping portion 63 is configured not to reach the tensile force necessary to break the pin 91.
  • the collar 95 can not enter any more into the bore of the anvil 61 after the collar 95 is reliably crimped to the shaft 910, and the pin gripping portion 63 It becomes impossible to move backward further.
  • the controller 277 drives the motor 31 until the pin gripping portion 63 can not move backward, and when the pin gripping portion 63 reaches such a state, the caulking process ends. It is determined that the driving of the motor 31 is stopped.
  • “when the pin gripping portion 63 reaches a state in which the pin gripping portion 63 can not move backward” means that the pin gripping portion 63 can not move backward with completion of the caulking of the collar 95 on the shaft 910 Point to the case where That is, when an external force acts on the pin gripping portion 63 (for example, some member directly or indirectly interferes with the pin gripping portion 63) and the backward movement of the pin gripping portion 63 is blocked. It does not refer to
  • the controller 277 decelerates the motor 31 based on the output signal from the hall sensor 316, and when the rotational speed (rotational speed) falls below a predetermined threshold, the motor 31 is in the locked state. to decide.
  • the controller 277 may determine that the motor 31 is decelerating if the amount of change in the rotational speed of the motor 31 is a negative value.
  • a change amount of the rotational speed of the motor 31 for example, a differential value or a difference value of the rotational speed per unit time of the motor 31 can be employed. Alternatively, other physical quantity change amounts corresponding to the rotational speed of the motor 31 may be employed.
  • the threshold value of the rotational speed for example, a value close to zero corresponding to a state in which the rotation of the motor 31 is substantially stopped is set in advance and stored in the ROM (or nonvolatile memory) of the controller 277. Good.
  • the driving of the motor 31 may be stopped simply by interrupting the energization of the motor 31, or may be performed by applying a braking force by an electric brake or a mechanical brake.
  • the driver drill 2 is provided with the clutch mechanism 4 that cuts off the transmission of torque when the torque exceeding the set threshold acts. Therefore, the user operates the mode switching ring 328 in advance to select the screw tightening mode, and further operates the torque adjustment ring 43 to securely clamp the collar 95 to the shaft 910, but the maximum torque A slightly smaller torque threshold can be set.
  • the clutch mechanism 4 operates before the controller 277 recognizes the locked state of the motor 31, and as the torque transmission from the planetary reduction gear 33 to the spindle 35 is interrupted, Movement is stopped. Thus, the caulking process is completed.
  • the controller 277 performs the return process after the caulking process is completed. For example, the controller 277 rotates the motor 31 in the reverse direction to the forward direction immediately after the end of the caulking process or after the elapse of a predetermined time. Alternatively, when the pull operation of the trigger 273 is released and the switch 274 is turned off, the controller 277 rotationally drives the motor 31 in the reverse direction to the forward direction. Then, when the locking flange 544 of the screw shaft 54 is returned forward to the initial position where it engages with the recess 534 of the nut 53, the controller 277 stops the driving of the motor 31 to complete the return process.
  • the controller 277 determines whether the drive current of the motor 31 exceeds a predetermined threshold value based on the output signal from the current detection amplifier 317. It can be determined accordingly.
  • the anvil 61 capable of engaging the pin gripping portion 63 that grips the pulling region 914 of the shaft portion 910 of the pin 91 with the power of the motor 31.
  • a configuration in which relative movement is made along the drive axis A1 is adopted.
  • the tension region 914 of the shaft portion 910 is located on the tension groove 915 and the opposite side of the caulking region 911 with respect to the tension groove 915, and the diameter of the bottom of the tension groove 915
  • the work material W is configured to be fastened by the fastener 9 including the end portion 916 formed to have a large diameter.
  • the fastener 9 having such a configuration, in a state where the pin grip portion 63 is engaged with the tension groove 915, the tension region 914 is relatively unlikely to be broken even if the tension region 914 is strongly pulled. Therefore, the collar 95 can be reliably crimped to the shaft portion 910 by continuing to pull the pulling area 914 until the pin gripping portion 63 can not move substantially rearward.
  • the controller 277 determines that the caulking process has ended when the motor 31 decelerates and the rotational speed falls below a predetermined threshold, and stops the driving of the motor 31. Is configured. In other words, the controller 277 stops the driving of the motor 31 when the motor 31 is in the locked state as a result of the pin gripping portion 63 becoming incapable of moving backward. The controller 277 can appropriately determine that the caulking process has ended based on the rotational speed of the motor, and stop the driving of the motor 31.
  • a brushless motor is employed as the motor 31.
  • a brushless motor generally has a Hall sensor 316 for rotation control.
  • the controller 277 can easily calculate the rotational speed of the motor 31 and the amount of change thereof based on the pulse signal output from the Hall sensor 316. Therefore, it is not necessary to separately provide a configuration for detecting that the pin gripping portion 63 can not move substantially rearward, and the configuration is rationalized.
  • the fastening tool 1 includes the clutch mechanism 4 provided on the transmission path for transmitting the torque from the motor 31 to the motion conversion mechanism 51.
  • the clutch mechanism 4 is configured as a torque limiter that cuts off the torque transmission from the planetary reduction gear 33 to the spindle 35 when a torque exceeding a set threshold acts.
  • the caulking process ends with the operation of the clutch mechanism 4.
  • the load on the motor 31 can be reduced and the heat generation of the motor 31 can be suppressed by the clutch mechanism 4 interrupting the transmission of the torque before the motor 31 completely reaches the locked state.
  • the fastening tool 1 is provided with a torque adjustment ring 43.
  • the torque adjustment ring 43 is configured to be able to adjust the pressing force of the engagement pin 49 by the coil spring 47, that is, the threshold value of the torque used as the operation reference of the clutch mechanism 4 according to the external operation of the user.
  • the torque when the motor 31 reaches the locked state may differ depending on factors such as the specifications of the fastener and the work material actually used.
  • the user can appropriately adjust the threshold according to the factor.
  • the collar 95 can be reliably crimped to the shaft 910, and the clutch mechanism 4 can be operated before the motor 31 reaches a completely locked state.
  • the fastening tool 1 of the present embodiment is provided with a driver drill 2 configured to rotationally drive the tip tool, and an attachment 5 that is detachable from the driver drill 2. From this, the following effects can be obtained.
  • the user In order to fasten the work material W by the fastener 9, it is necessary to form a mounting hole through which the pin 91 is inserted into the work material W prior to the fastening operation. Therefore, the user first attaches the tip tool for the drilling operation to the chuck 37 of the driver drill 2 and performs the drilling operation for forming the mounting hole in the work material W.
  • the tip tool is removed, the attachment 5 is attached to the driver drill 2 in the above-described procedure, and the fastening work of the work material W using the fastener 9 by the fastening tool 1 is performed.
  • the user can set the operation threshold of the driver drill 2 to the screw tightening mode and operate the torque adjustment ring 43 to set the threshold value of the torque before attaching the attachment 5 as necessary. .
  • the convenience is improved.
  • the fastening tool according to the present invention is not limited to the configuration of the illustrated fastening tool 1.
  • the changes exemplified below can be made. These modifications may be adopted in combination with the invention described in the fastening tool 1 or each claim in which any one or a plurality of them are independently or shown in the embodiments.
  • the fastening tool 1 of the above embodiment is configured by a known driver drill 2 and an attachment 5 that can be attached to and detached from the driver drill 2.
  • the fastening tool according to the present invention does not necessarily have to be configured with a working tool and an attachment that can independently perform processing operations other than the fastening operation. That is, the fastening tool 1 may be configured as a single working tool for fastening work.
  • the clutch mechanism 4 does not necessarily need to be provided in the fastening tool 1 (driver drill 2). That is, the caulking process may be completed only when the motor 31 reaches the locked state. Further, the controller 277 does not automatically stop the driving of the motor 31 when the motor 31 reaches the locked state, and drives the motor 31 in response to the switch 274 of the trigger 273 being turned off. It may stop. On the contrary, the caulking process may be ended only by the operation of the clutch mechanism 4 without the determination by the controller 277 as to whether or not the lock state is reached.
  • the fastening tool 1 may be provided with a detection mechanism capable of detecting the operation of the clutch mechanism 4.
  • the controller 277 may be configured to stop the driving of the motor 31 when recognizing that the clutch mechanism 4 has operated based on the detection result of the detection mechanism.
  • a detection mechanism of the operation of the clutch mechanism 4 for example, a displacement sensor capable of detecting the start of idling of the internal gear 330, a rotation sensor capable of detecting a change in the amount of rotation of the spindle 35, or the like can be employed.
  • the threshold value of the torque at which the clutch mechanism 4 as a torque limiter operates does not necessarily have to be adjustable, and may be set uniformly. For example, if the fastening tool 1 is always used for a fastening operation using the same fastener (for example, the fastener 9 illustrated in the embodiment), while the collar 95 is securely crimped to the shank 910, An appropriate threshold value may be set so as to interrupt the transmission of torque before the motor 31 reaches the lock state.
  • the non-rupturing multiple-member clamping fastener usable in the fastening tool 1 is not limited to the fastener 9 (see FIG. 1) exemplified in the above embodiment.
  • the diameter and length of the pin 91 and the collar 95, the configuration of the caulking groove 912 and the pulling area 914, and the like can be changed as appropriate.
  • the configurations of the anvil 61 and the pin gripping portion 63 of the nose portion 6 (for example, the angle of the tapered portion 617, the shapes of the jaws 630 and the claws 631) may be changed appropriately in accordance with the change of the fastener 9.
  • the configurations of the motor 31 and the drive mechanism may also be changed as appropriate.
  • a motor with a brush may be adopted as the motor 31 or an AC motor may be adopted.
  • the motion conversion mechanism 51 of the above embodiment is configured as a so-called feed screw mechanism including a nut 53 and a screw shaft 54 directly screwed to the nut 53.
  • a ball screw mechanism having a nut and a screw shaft engaged with the nut through a ball may be employed.
  • the screw shaft is restricted from moving in the front-rear direction, and is rotatably supported, while the nut moves in the front-rear direction as the screw shaft rotates. It may be done.
  • the pin gripping portion 63 may be directly or indirectly coupled to the nut.
  • the controller 277 is exemplified by a microcomputer including a CPU, a ROM, a memory, and the like.
  • the controller may be, for example, an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). And the like may be configured by programmable logic devices such as.
  • the fastener 9 is an example of the "non-rupturing multiple member caulking fastener" of the present invention.
  • the pin 91 and the collar 95 are examples of the “pin” and the “color” of the present invention, respectively.
  • the shaft 910 and the head 917 are examples of the “shaft” and the “head” in the present invention, respectively.
  • the caulking area 911 and the caulking groove 912 are examples of the “caulking area” and the “caulking groove” in the present invention, respectively.
  • the tension region 914, the tension groove 915, and the end 916 are examples of the "end region", the "tension groove”, and the "end” in the present invention, respectively.
  • the fastening tool 1 is an example of the "fastening tool” in the present invention.
  • the drive shaft A1 is an example of the “drive shaft” in the present invention.
  • the anvil 61 and the pin gripping portion 63 are examples of the “anvil” and the “pin gripping portion” in the present invention, respectively.
  • the motor 31 is an example of the “motor” in the present invention.
  • the planetary reduction gear 33, the spindle 35, the chuck 37, and the motion conversion mechanism 51 are examples of the "drive mechanism” in the present invention.
  • the controller 277 (CPU) is an example of the “control unit” in the present invention.
  • the motion conversion mechanism 51 is an example of the “motion conversion mechanism” in the present invention.
  • the clutch mechanism 4 is an example of the “torque limiter” in the present invention.
  • the torque adjustment ring 43 is an example of the “adjustment member” in the present invention.
  • the fastening tool includes a rotary tool configured to rotationally drive a final output shaft by the power of the motor, and an attachment removably attached to the rotary tool.
  • the drive mechanism includes a motion converting mechanism configured to convert rotational movement of the final output shaft into linear motion and move the pin gripping portion in the front-rear direction with respect to the anvil,
  • the attachment may include the motion converting mechanism, the pin gripping portion, and the anvil.
  • the driver drill 2 and the attachment 5 are examples of the “rotary tool” and the “attachment”, respectively.
  • the drive mechanism includes a planetary reduction gear configured to increase torque of the motor and transmit the torque to the final output shaft,
  • the motor, the planetary reduction gear, the final output shaft, and the motion conversion mechanism may be arranged coaxially.
  • the planetary reduction gear 33 is an example of a “planet reduction gear”.
  • the rotary tool may be a driver drill.
  • the fastening tool may be configured to fasten the working material with a fastener having only one tension groove as the fastener.
  • the fastening tool further comprises a controller configured to control the drive of the motor,
  • the control unit may be configured to stop driving of the motor when the torque limiter operates.

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  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)

Abstract

Un outil de fixation (1) selon l'invention fixe une pièce (W) par l'intermédiaire d'une fixation de sertissage à éléments multiples de type incassable (9) comprenant une broche (91) et une collerette (95). L'outil de fixation (1) comprend une enclume (61), une partie de préhension (63) de broche, un moteur (31) et un mécanisme d'entraînement (engrenage de réduction planétaire (33), tourillon (35), mandrin (37), mécanisme de conversion de mouvement (51)). Le mécanisme d'entraînement est entraîné par la force motrice du moteur (31), et effectue une étape de sertissage dans laquelle la partie de préhension (63) de broche dans un état de préhension d'une région de tension (914) de la broche (91) est déplacée vers l'arrière depuis une position initiale le long d'un axe d'entraînement (A1), moyennant quoi le collier (95) est serti dans une rainure de sertissage d'une partie arbre de la broche (91) par l'enclume (61). L'étape de sertissage se termine lorsque la partie de préhension (63) de broche atteint un état sensiblement incapable de se déplacer vers l'arrière.
PCT/JP2018/032944 2017-09-15 2018-09-05 Outil de fixation WO2019054257A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017177794A JP2019051543A (ja) 2017-09-15 2017-09-15 締結工具
JP2017-177794 2017-09-15

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WO2019054257A1 true WO2019054257A1 (fr) 2019-03-21

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CN112453308A (zh) * 2019-09-06 2021-03-09 株式会社牧田 紧固工具
US11673243B2 (en) 2018-09-05 2023-06-13 Milwaukee Electric Tool Corporation Blind rivet nut-setting tool

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JPH0788587A (ja) * 1991-02-12 1995-04-04 Maschinenbau Subotsch & Schwab Gmbh リベッター
JPH07164092A (ja) * 1993-11-16 1995-06-27 Gesipa Blindniettechnik Gmbh ブラインドリベットの固定方法及び固定装置
JP2000176853A (ja) * 1998-12-09 2000-06-27 Sekisui Chem Co Ltd 拡開式リベットの締結用治具
JP2003266143A (ja) * 2002-03-14 2003-09-24 Lobtex Co Ltd 作動工具
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Publication number Priority date Publication date Assignee Title
JPH0788587A (ja) * 1991-02-12 1995-04-04 Maschinenbau Subotsch & Schwab Gmbh リベッター
JPH07164092A (ja) * 1993-11-16 1995-06-27 Gesipa Blindniettechnik Gmbh ブラインドリベットの固定方法及び固定装置
JP2000176853A (ja) * 1998-12-09 2000-06-27 Sekisui Chem Co Ltd 拡開式リベットの締結用治具
JP2003266143A (ja) * 2002-03-14 2003-09-24 Lobtex Co Ltd 作動工具
JP2010509547A (ja) * 2006-11-03 2010-03-25 ハック インターナショナル，インコーポレイテッド 低スウェージ荷重の締結システムおよび方法

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Publication number Priority date Publication date Assignee Title
US11673243B2 (en) 2018-09-05 2023-06-13 Milwaukee Electric Tool Corporation Blind rivet nut-setting tool
CN112453308A (zh) * 2019-09-06 2021-03-09 株式会社牧田 紧固工具
CN112453308B (zh) * 2019-09-06 2024-04-26 株式会社牧田 紧固工具

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