EP2855046B1 - Blindnietbefestigungswerkzeug - Google Patents

Blindnietbefestigungswerkzeug Download PDF

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Publication number
EP2855046B1
EP2855046B1 EP13797276.6A EP13797276A EP2855046B1 EP 2855046 B1 EP2855046 B1 EP 2855046B1 EP 13797276 A EP13797276 A EP 13797276A EP 2855046 B1 EP2855046 B1 EP 2855046B1
Authority
EP
European Patent Office
Prior art keywords
clutch
spindle
blind rivet
electric motor
ball screw
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP13797276.6A
Other languages
English (en)
French (fr)
Other versions
EP2855046B8 (de
EP2855046A1 (de
EP2855046A4 (de
Inventor
Hiroyuki Masugata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Newfrey LLC
Original Assignee
Newfrey LLC
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Filing date
Publication date
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Publication of EP2855046A1 publication Critical patent/EP2855046A1/de
Publication of EP2855046A4 publication Critical patent/EP2855046A4/de
Application granted granted Critical
Publication of EP2855046B1 publication Critical patent/EP2855046B1/de
Publication of EP2855046B8 publication Critical patent/EP2855046B8/de
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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
    • B21J15/04—Riveting hollow rivets mechanically
    • B21J15/043—Riveting hollow rivets mechanically by pulling a mandrel
    • 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
    • B21J15/105—Portable riveters
    • 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
    • B21J15/30—Particular elements, e.g. supports; Suspension equipment specially adapted for portable riveters
    • B21J15/32—Devices for inserting or holding rivets in position with or without feeding arrangements
    • B21J15/326—Broken-off mandrel collection

Definitions

  • the present invention relates to an electric blind rivet fastening device using an electric motor and, more specifically, to a blind rivet fastening device in which a passage for collecting broken mandrels does not have to be provided on the axis of the motor.
  • a blind rivet has a mandrel and a rivet body, and the rivet body has a hollow, cylindrical sleeve, and a large-diameter flange formed on one end of the cylindrical sleeve.
  • the mandrel has a shaft portion which passes through the rivet body, extends beyond the flange, and is gripped by the blind rivet fastening device, and a mandrel head whose diameter is greater than the inner diameter of the cylindrical sleeve positioned so as to protrude from the other end of the cylindrical sleeve.
  • the gripped portion of the mandrel shaft is inserted into the nose of the blind rivet fastening device, and the rivet body and the mandrel head are gripped by the blind rivet fastening device so as to protrude from the nose.
  • the sleeve of the rivet body is inserted into a mounting hole in the members to be fastened (fastened members), and the flange is brought into contact with the surface of a fastened member.
  • the blind rivet in the blind rivet fastening device is operated, the mandrel shaft is pulled out with force, the mandrel head deforms and widens a portion of the sleeve, the fastened members are strongly interposed between the flange and the deformed portion of the sleeve with a wider diameter, the mandrel shaft breaks off in the breakable portion with a narrow diameter, and the rivet body is fastened to the fastened members.
  • the fastened members are an automotive body panel and automotive component mounted on the automotive body panel
  • the automotive component is mounted on the automotive body panel by fastening both members with a blind rivet while the mounted portion of the automotive component is superimposed on the body panel.
  • blind rivet can be fastened from one side, which is convenient when the automotive body panel or other panel is a large panel covering a wide area.
  • Blind rivets are usually made of a metal such as steel or aluminum. After the fastening operation has been completed, the broken mandrel shaft from the blind rivet has to be collected from the blind rivet fastening device.
  • Japanese Patent Publication No. 5-200476 discloses one type of blind rivet fastening device, which is an electric blind rivet fastening device using a battery-operated electric motor.
  • An electric motor stored inside the handle drives the blind rivet fastening mechanism, and the gripped portion of the mandrel shaft on a blind rivet gripped by the nose is strongly pulled out so the mandrel head deforms and widens a portion of the sleeve, the mandrel shaft breaks off in the small-diameter breakable portion, and the blind rivet is fastened in the fastened members.
  • a battery-operated blind rivet fastening device does not require a pressurized fluid supply tube between the handle and a pneumatic or hydraulic pressurized fluid supply source. This lessens the burden on the operator holding the handle, and makes the fastening operation easier.
  • a collection chamber for collecting broken mandrel shafts is arranged to the rear of the blind rivet fastening mechanism.
  • a large electric motor is arranged in the upper portion of the handle. Because this increases the size of the upper portion of the fastening device handle, and because both the electric motor in the upper portion of the handle and the nose portion at the front of the fastening device are heavy, the weight balance of the fastening device is poor. This makes it difficult for the operator to hold the handle and perform the fastening operation comfortably.
  • Japanese Patent Publication No. 2003-266143 discloses a blind rivet fastening device using an electric motor.
  • the blind rivet fastening mechanism, the collection chamber for broken mandrels, and the electric motor between the fastening mechanism and the collection chamber are all arranged coaxially inside a substantially cylindrical housing.
  • the electric motor is arranged in the upper portion of the handle at the rear.
  • the motor is arranged between the blind rivet fastening mechanism and the collection chamber for broken mandrel shafts.
  • the passage for collecting broken mandrel shafts is formed on the central axis of the motor, forming an air cavity on the central axis of the motor and requiring an electric motor with a special structure. Therefore, an electric blind rivet fastening device is required which can use an all-purpose electric motor and which does not require a recovery passage for broken mandrel shafts along the central axis.
  • Japanese Patent Publication No. 2008-168324 discloses a hydraulic blind rivet fastening device controlled by a pneumatic control mechanism.
  • This blind rivet fastening device includes a blind rivet fastening mechanism housed inside a cylindrical housing, and a handle extending orthogonally with respect to the cylindrical housing for the fastening mechanism.
  • the collection chamber for broken mandrel shafts is provided at the rear end of the housing for the fastening mechanism.
  • the drawing force on the mandrel shaft of the blind rivet gripped by the nose causes the mandrel head to deform and widen a portion of the sleeve while also causing the small-diameter breakable portion of the mandrel shaft to break.
  • the fastened members are fastened by the blind rivet, and the broken mandrel shaft is collected in the collection chamber.
  • the blind rivet fastening device in Japanese Patent Publication No. 2008-168324 has to be connected to a pressurized air source in the handle or to a supply tube for pressurized air. As a result, the operator is burdened by a supply tube. Because a pressurized fluid supply tube is required, the fastening device is not as easy to handle as the electric blind rivet fastening devices in Patent Document 1 and Patent Document 2, and the operator has to drag along a supply tube which complicates the operation.
  • Japanese Patent Publication No. 2011-218381 discloses a blind rivet fastening device using an electric motor.
  • the device in Japanese Patent Publication No. 2011-218381 includes a collection chamber containing broken mandrel shafts in the upper portion of the handle and in front of the electric motor in the axial direction.
  • the electric motor is arranged to the rear of the collection chamber in the axial direction, and a power transmitting means for transmitting the rotation of the electric motor to the pulling head is arranged below the collection chamber in order to bypass the collection chamber. Because the collection chamber for broken mandrels is arranged in front of the electric motor, the passage for collecting broken mandrels does not have to be provided along the central axis of the motor.
  • a power transmitting means is provided which bypasses the collection chamber.
  • a mechanical switch is used to detect the rotation of the drive shaft passing below the collection chamber and to determine the position of the pulling head.
  • the mechanical switch takes up space below the collection chamber, so the size of the collection chamber has to be reduced.
  • EP-A-2374558 discloses an electric blind rivet fastening device for setting of blind rivets in workpieces which relies upon a plurality of microswitches to detect the position of a corresponding plurality of collars which engage with a hollow threaded tube through which tube broken mandrel stems pass to a collection chamber.
  • the axial movement of the collars is not known directly from the rotation of the electric motor, but by detection of actuation or de-actuation of the microswitches. Use of such microswitches can be costly.
  • DE-A-10 2007 059 422 discloses a portable riveting device for placing of rivet elements.
  • An electric motor is employed and measuring devices are used to monitor the performance of the motor so that real-time motor control can be exerted during the placing process.
  • the control exerted is that of comparing measured parameters to known parameter boundaries in order to make a determination as to whether the placing process is progressing satisfactorily, or not.
  • the rotation angle of the motor may be measured by use of a Hall sensor in order to determine the path covered by the rivet during its placing.
  • a compact, battery-powered blind rivet fastening device in which the passage for collecting broken mandrels does not have to be provided along the central axis of the motor.
  • a blind rivet fastening device is also desired in which the collection chamber for collecting broken mandrels can be enlarged.
  • the collection chamber for mandrels is positioned in front of the brushless motor, and a second shaft provided below the collection chamber bypasses the electric motor to transmit the rotation of the electric motor to the pulling head.
  • the position of the pulling head is determined by the rotation of the brushless motor.
  • a mechanical switch is not required, the capacity of the collection chamber can be increased, and durability can be improved.
  • a clutch is provided to position the pulling head at the home position, and avoid excessive torque.
  • One aspect of the present invention is an electric blind rivet fastening device according to claim 1.
  • the position of the pulling head is determined by detecting the rotation of the electric motor.
  • a mechanical switch is not required to determine the position of the pulling head, and the durability can be improved.
  • this electric blind rivet fastening device because the collection chamber for broken mandrels is provided in front of the electric motor in the tool housing, a passage for collecting broken mandrels does not have to be provided along the central axis of the motor.
  • the collection chamber for broken mandrels is provided between the electric motor and the spindle, the power can bypass the collecting case during transmission, and the position of the pulling head can be determined by detecting the rotation of the electric motor. As a result, a mechanical switch is not required to determine the position of the pulling head, and the capacity of the collecting case can be increased.
  • the drawing means includes a pulling head moved in the axial direction by the ball screw shaft moving in the axial direction; a jaw case adjacent to the pulling head, integrated with the pulling head, and having an inner peripheral surface whose inner diameter becomes smaller towards the front end; a jaw provided inside the jaw case, and having an outer peripheral surface in contact with the inner peripheral surface of the jaw case; and a nose piece adjacent to the jaw, and having an opening portion through which passes the shaft portion of the mandrel. In this way, the shaft portion of the mandrel can be reliably gripped and drawn to fasten the blind rivet.
  • the power transmitting means includes: a motor gear connected to the electric motor; a rear gear provided below the motor gear and engaging the motor gear; a spindle gear engaging the spindle; a front gear provided below the spindle gear and engaging the spindle gear; a second shaft provided below the collection chamber and integrally joined to the rear gear and the front gear. In this way, a second shaft parallel to the shaft of the electric motor can bypass the collection chamber and transmit power from the electric motor to the spindle.
  • the electric motor is a brushless motor.
  • the rotation count of a brushless motor can be controlled with greater precision.
  • the rotation count detecting element is a Hall element. The rotation of the electric motor can be easily detected when a Hall element is included in the brushless motor.
  • This blind rivet fastening device comprises a first clutch including: a spindle clutch having a cylindrical portion and a fan-shaped portion, able to move in the axial direction with respect to the spindle, and rotating with the spindle; and a nut clutch having a fan-shaped portion engaging the fan-shaped portion of the spindle clutch, and integrally joined to the ball screw nut; the first clutch able to disengage from the spindle clutch and the nut clutch so as not to transmit the rotation of the spindle to the ball screw nut. This can keep the pulling head from performing excessive drawing.
  • the protruding portion of a cylindrical tail integrally joined to the rear end of the ball screw shaft may push an inner end face of the spindle clutch to the rear in the axial direction, and the fan-shaped portion of the spindle clutch may disengage from the fan-shaped portion of the nut clutch when the ball screw shaft reaches the rear end in the axial direction.
  • This blind rivet fastening device comprises a second clutch including: a rear clutch having a cylindrical shape and saw teeth at the front end, and arranged so as to be able to move in the axial direction around the pulling head but so as not to be able to rotate; and a front clutch having a cylindrical shape and saw teeth at the rear end engaging the saw teeth of the rear clutch, and arranged in front of the rear clutch, around the pulling head, and integrally joined to the pulling head.
  • the saw teeth of the rear clutch may have one face which is parallel to the rear clutch in the axial direction, and another face inclined with respect to the axial direction; and the saw teeth of the front clutch may have a shape able to engage the saw teeth of the rear clutch.
  • the ball screw shaft does not move in the axial direction but rotates with the ball screw nut, the front clutch rotates, and the rear clutch retreats in the axial direction so that the front clutch is able to rotate when the ball screw shaft reaches the front end.
  • the present invention provides a compact, battery-powered blind rivet fastening device in which a passage for collecting broken mandrels does not have to be provided on the axis of the motor.
  • the present invention also provides a blind rivet fastening device able to enlarge the capacity of the collection chamber for collecting broken mandrels.
  • the present invention provides a blind rivet fastening device in which excessive torque can be avoided.
  • FIG. 1 is a front view of an electric blind rivet fastening device according to a first embodiment.
  • the electric blind rivet fastening device 1 has a blind rivet fastening mechanism 2 housed inside a substantially cylindrical housing, and a handle 3 extending orthogonally down from the center position of the fastening mechanism 2.
  • a battery is detachably mounted in a battery holder 5 in the lower portion of the handle 3.
  • a trigger 6 is provided in the handle 3 at a position adjacent to the fastening mechanism 2.
  • the fastening mechanism 2 is activated, and a blind rivet is fastened.
  • the fastening mechanism 2 returns to the home position HP (front end position) and the fastening operation is stopped (or completed).
  • the blind rivet fastening mechanism 2 has a nose 7 in the front (on the right in FIG. 1 ), a motor unit 9 in the rear (on the left in FIG. 1 ), and a power transmission controller 11 in the middle.
  • a pulling head 30 ( FIG. 3 , etc.) is provided in the nose 7 to strongly pull the mandrel shaft of the blind rivet rearward (leftward in FIG. 1 ), and an electric motor 13 (brushless motor) is housed in the motor unit 9.
  • FIG. 2 shows the structure of the motor unit 9 and the power transmission controller 11 in the electric blind rivet fastening device 1 of the present invention.
  • the electric motor 13 is a brushless motor.
  • the rotor has magnets, and the windings are on the stator.
  • a Hall element (magnetism sensor) 13A incorporated into the electric motor 13 detects the rotational angle of the rotor.
  • An electronic circuit 13B for the brushless motor performs switching on timing based on the magnetic poles of the rotor.
  • the brushless motor can determine the position of the pulling head by detecting the rotation of the rotor. Any commonly used element other than a Hall element can be used to detect the rotation of the rotor. Because brushless motors are well known, further explanation has been omitted.
  • a collection chamber 10 for broken mandrel shafts is provided in the upper portion of the handle 3 between the nose 7 and the motor unit 9.
  • the collection chamber 10 has a semi-cylindrical shape, and is surrounded by a transparent or semi-transparent cover 10A.
  • the broken mandrel shafts can be viewed through the cover 10A.
  • the cover 10A can be opened and closed to remove the broken mandrel shafts.
  • a handle 3 extends downward at an angle from the location of the collection chamber 10 so that the blind rivet fastening device 1 is easier for the operator to grasp. Because the collection chamber 10 is arranged in the middle of the tool housing 27, a mandrel collector does not have to be placed at the rear end of the tool housing as in Patent Document 2, and handling of the fastening device by the operator is not destabilized by the weight of the electric motor as in Patent Document 1.
  • a power transmission controller 11 is provided between the motor unit 9 and the nose 7 below the collection chamber 10.
  • the power transmission controller 11 has a power transmission mechanism for transmitting the rotational force (torque) of the electric motor 13 in the motor unit 9 to the spindle 14 in the nose 7, and a control mechanism for controlling the rotation of the electric motor 13 based on operation of the trigger, and for moving the pulling head of the nose 7 forward and backward via the rotation of the spindle 14.
  • a fluid supply tube pressurized air, etc.
  • the power transmission controller 11 has a mechanism for transmitting rotational power from the electric motor 13 (brushless motor) in the motor unit 9 to the spindle 14 of the nose 7 while bypassing the space occupied by the collection chamber 10.
  • a motor gear 15 is arranged to the rear of the collection chamber 10 and is connected to the motor shaft of the electric motor 13.
  • a spindle gear 17 is arranged in front of the collection chamber 10 and is connected to the spindle 14 along a central axis coaxial with the central axis of the motor shaft.
  • a second shaft 18 is provided between the motor gear 15 and the spindle gear 17 in the space beneath the collection chamber 10.
  • the second shaft 18 is supported in the longitudinal direction (axial direction) of the blind rivet fastening mechanism 2 and parallel to the central axis of the motor shaft of the electric motor 13 and the spindle 14 so as to rotate around the axis.
  • a rear gear 19 engaging the motor gear 15 is provided on the rear end of the second shaft 18, and a front gear 21 engaging the spindle gear 17 is provided on the front end of the second shaft 18.
  • the second shaft 18 is a single shaft that engages both the rear gear 19 and the front gear 21.
  • the second gear 18 rotates in the reverse direction when the electric motor 13 rotates in the forward direction.
  • the front gear 21 engages the spindle gear 17
  • the spindle gear 17 rotates in the forward direction
  • the spindle 14 rotates in the forward direction when the second shaft 18 rotates in the reverse direction. In this way, the spindle 14 rotates in the same direction as the electric motor 13.
  • the gear ratio of the motor gear 15 and the rear gear 19 and the gear ratio of the front gear 21 and the spindle gear 17 are determined by the output of the electric motor 13 and the fastening force for the blind rivets.
  • the power transmission controller 11 has a control mechanism for controlling the forward rotation, stopping, and reverse rotation of the electric motor 13 based on the operation of the trigger 6. In this way, the rotation of the electric motor 13 is transmitted to the spindle 14 via the second shaft 18.
  • the control mechanism responds to the operation of the trigger 6 by controlling the electric motor 13, and drawing back the pulling head 30 of the nose 7 from the home position HP to the rear position RP where the mandrel shaft of the blind rivet is broken. It remains at the rear position RP until the trigger 6 is released. At this time, it moves forward from the rear position RP to the home position HP (front position).
  • the home position HP and the rear position RP are positions in the axial direction of the pulling head 30. However, the home position HP and the rear position RP also correspond to the ball screw shaft 36, the jaw case 32, and the jaw 29.
  • FIG. 3 is a vertical cross-sectional view of the front portion of the fastening mechanism in the electric blind rivet fastening device of FIG. 1 in which a blind rivet has been attached to the nose 7.
  • the blind rivet is held in the nose piece 31 of the electric blind rivet fastening device 1.
  • the blind rivet has a rod-shaped mandrel M and a hollow, cylindrical rivet body R.
  • the rivet body R has a cylindrical sleeve S, and a flange F with a diameter greater than that of the hollow sleeve formed at one end of the hollow sleeve.
  • the mandrel M has a shaft J, which is a rod-shaped body extending from the flange through the rivet body where the portion passing through the flange of the rivet body R is gripped by the nose 7, and a mandrel head H with a diameter greater than the inner diameter of the hollow sleeve S which extends from the other end of the hollow sleeve.
  • the blind rivet is held by the blind rivet fastening device with the gripped portion of the mandrel shaft J inserted into the nose 7 of the blind rivet fastening device, and the rivet body R and the mandrel head H protruding from the nose.
  • the blind rivet held by the blind rivet fastening device 1 is inserted into a mounting hole in fastened members such as an automotive body panel and automotive component until the sleeve S of the rivet head R comes into contact with a fastened member.
  • fastened members such as an automotive body panel and automotive component
  • the mandrel shaft is strongly drawn back by the blind rivet fastening device 1, the mandrel head H deforms and widens a portion of the sleeve S of the rivet body R, and the fastened members are strongly interposed between the flange F and the deformed portion of the sleeve.
  • the rivet R is fastened to the fastened members, and the automotive component is mounted on the automotive body panel.
  • the blind rivet is usually made of a metal such as stainless steel or aluminum.
  • the nose 7 occupies the front portion of the blind rivet fastening mechanism 2 in front of the collection chamber 10. As shown in FIG. 3 , the nose 7 is hollow in the central axial portion. The mandrel M of the blind rivet is inserted and held in this portion. It also is able to send the broken mandrel shaft J to the collection chamber 10.
  • the nose 7 includes a jaw 29 for gripping the mandrel shaft J, a jaw case 32 surrounding the jaw 29, and a pulling head 30 integrated with the jaw case 32 and able to move in the axial direction of the blind rivet fastening mechanism 2 so as to draw the jaw 29 to the rear.
  • the mandrel shaft J gripped by the jaw 29 is strongly pulled in a linear motion to the rear of the pulling head 30, the mandrel head H deforms and widens a portion of the sleeve S of the rivet body R, the fastened members are strongly interposed between the flange F and the deformed sleeve, the mandrel shaft J is broken off in the breakable portion, and the blind rivet is fastened in the fastened members.
  • FIG. 4 is a vertical cross-sectional view of the front portion of the nose 7 in the fastening mechanism of FIG. 3 .
  • the nose 7 has a nosepiece 31 on the tip, and a cylindrical nose housing 33 extending from the nosepiece 31 towards the tool housing 27 in the rear.
  • the cylindrical pulling head 30 is housed inside the nose housing 33 so as to be able to slide in the axial direction (longitudinal direction) with respect to the nose housing 33.
  • the tip of the jaw 29 is arranged near the rear end of the nosepiece 31, and is housed inside the tapered cavity of the jaw case 32 which tapers towards the nosepiece 31.
  • the jaw 29 has two or three parts arranged concentrically inside the cylindrical jaw case 32, and combine to form a hollow cylinder with a cavity in the axial direction of the jaw case 32. This grips the mandrel M of the blind rivet inserted into the nosepiece 31 so that the shaft J of the mandrel M does not fall out.
  • a hollow, cylindrical jaw pusher 35 is arranged to the rear of the jaw 29 to apply forward pressure on the jaw 29.
  • a jaw pusher spring 42 is arranged between the jaw pusher 35 and the pulling head 30, and applies forward pressure on the jaw pusher 35.
  • the pulling head 30 is integrated with the jaw case 32 surrounding and supporting the jaw 29. It is arranged along the central axis of the nose housing 33, and is able to slide in the axial direction with respect to the nose housing 33.
  • the pulling head 30 can draw in the jaw 29 from the front end position to the rear end position, and return the jaw from the rear end position to the front end position.
  • An O-ring 46 and a steel ball 47 are provided to obstruct a portion of the hollow passage at the entrance to the nosepiece 31 to allow the mandrel M of a blind rivet to be inserted, but to keep the broken mandrel shaft 43 from being discharged from the nosepiece 31.
  • the pulling head 30 and the jaw case 32 can slide in the axial direction inside the nose housing 33. As explained below with reference to the second clutch, the pulling head 30 can rotate in the forward rotational direction of the spindle 14, and can rotate in the reverse direction when rotational force is applied in the reverse direction that exceeds a predetermined level.
  • the pulling head 30 is fixed to the ball screw shaft 36 in the rear.
  • the ball screw shaft 36 is a cylindrical member, and extends inside of the mast housing 34 fixed to the tool housing 27 in the axial direction.
  • a cylindrical tail 45 narrower than the ball screw shaft 36 is connected to the rear of the ball screw shaft 36 in the axial direction.
  • the tail 45 extends to the rear along the axial portion of the spindle 14. The tail 45, the ball screw shaft 36, and the pulling head 30 move linearly, and the jaw 29 is drawn backward and returned to the front of the nose 7.
  • the spindle 14 is connected to a ball screw nut 44 via a first clutch as explained below.
  • a ball screw shaft 36 is arranged in the axial portion of the ball screw nut 44. Internal threading is formed in the ball screw nut 44. The external threading of the ball screw shaft 36 is screwed into this internal threading.
  • the rotation of the spindle 14 is transmitted to the ball screw nut 44.
  • the forward rotation of the spindle 14 not moving in the axial direction is converted to retreating motion drawing the ball screw shaft 36 to the rear, and the reverse rotation of the spindle 14 is converted to advancing motion causing the ball screw shaft 36 to move forward.
  • the spindle 14 rotates in the forward direction the ball screw shaft 36 and the pulling head 30 retreat, the mandrel shaft J of the blind rivet is gripped by the jaw 29 and strongly pulled, and the blind rivet is fastened.
  • the axial portions of the jaw 29, the jaw pusher 35, the pulling head 30, the ball screw shaft 36, and the tail 45 form a hollow passage connecting the entrance of the nose 7 to the entrance of the collection chamber 10.
  • the shaft of the mandrel M is inserted into the jaw 29, and the broken mandrel shaft 43 is sent to the collection chamber 10 along arrow 48 in FIG. 3 .
  • a broken mandrel shaft is pushed through the hollow passage by the next broken mandrel shaft.
  • FIG. 5 is a perspective view of a portion of the nose 7 in which the mast housing 34 and nose housing 33 have been removed to show the internal structure.
  • a first clutch consisting of a spindle clutch 61 and a nut clutch 62 is provided in the portion between the spindle 14 and the ball screw nut 44.
  • the spindle clutch 61 and the nut clutch 62 in the first clutch disengage, and rotation is not transmitted from the spindle 14 to the ball screw nut 44. This keeps the pulling head 30 from being pulled back too far.
  • a second clutch is provided in front of the ball screw shaft 36, which consists of a rear clutch 63 and a front clutch 64. In the second clutch, when the pulling head 30 reaches the home position HP at the front end, the front clutch 64 and the pulling head 30 are allowed to rotate with the ball screw nut 44, and this prevents the application of excessive torque to the pulling head 30.
  • FIG. 6 is a perspective view of a portion of the first clutch consisting of the spindle clutch 61 and the nut clutch 62 in which the tool housing 27 and mast housing 34 have been removed to show the internal structure.
  • the spindle clutch 61 is provided near the inside of the cylindrical spindle 14.
  • the spindle clutch 61 cannot rotate with respect to the spindle 14, but can slide in the axial direction and is pushed in the direction of the nut clutch 62 by the spindle clutch spring 65.
  • the spindle clutch 61 has a cylindrical portion, and a flange portion at the end of the cylindrical portion.
  • the flange portion has a fan-shaped portion as viewed in the axial direction.
  • the nut clutch 62 is integrated with the ball screw nut 44.
  • the nut clutch 62 has a fan-shaped portion, which is inserted into the non-fan-shaped portion of the spindle clutch 61.
  • the fan-shaped portion of the spindle clutch 61 is complemented by the fan-shaped portion of the nut clutch 62.
  • the tail 45 is connected to the rear end of the ball screw shaft 36.
  • a tail protrusion 45A is provided in the axial portion of the tail 45.
  • the tail 45 also moves to the rear.
  • the spindle clutch 61 resists the action of the spindle clutch spring 65 and moves to the rear (in the direction of arrow 41).
  • the spindle clutch 61 and the nut clutch 62 disengage.
  • the electric motor 13 rotates in the forward direction (the direction indicated by arrow 39).
  • the rotation of the electric motor 13 is transmitted to the spindle 14 and from the spindle clutch 61 integrated with the spindle 14 to the nut clutch 62 in order to rotate the ball screw nut 44 integrated with the nut clutch 62 and rotate the ball screw shaft 36 in the direction of arrow 41 (the rear direction).
  • the tail protrusion 45A of the tail 45 integrated with the ball screw shaft 36 makes contact with the inner end face of the spindle clutch 61.
  • the spindle clutch 61 is pushed by the tail protrusion 45A against the action of the spindle clutch spring 65 in the direction of arrow 41.
  • This causes the spindle clutch 61 and the nut clutch 62 to disengage.
  • the nut clutch 62 no longer rotates with the ball screw nut 44 and the spindle clutch 61. Movement of the ball screw shaft 36 in the direction of arrow 41 is stopped, and the drawing action of the pulling head 30 is stopped.
  • the spindle clutch 61 and the nut clutch 62 disengage at the rear position RP, stopping the transmission of rotation from the spindle clutch 61 to the nut clutch 62, and keeping the pulling head 30 from being drawn back too far.
  • FIG. 7A through FIG. 7C are perspective views of a portion of the second clutch consisting of a rear clutch 63 and a front clutch 64.
  • the nose housing 33 and a portion of the mast housing 34 have been removed to show the internal structure.
  • FIG. 7A shows the pulling head 30 at the rear position RP before it has returned to the home position HP.
  • FIG. 7B shows the pulling head 30 at the home position HP, and the ball screw shaft 36 at the front end.
  • FIG. 7C shows the front clutch 64 and the rear clutch 63 disengaged at the home position HP so that the pulling head 30 can no longer move.
  • Rear clutch 63 is a cylindrical member surrounding the pulling head 30 It is arranged so as to be able to move a predetermined distance around the pulling head 30 in the axial direction.
  • Saw teeth are provided at the front end of the rear clutch 63. One face of the saw teeth is parallel to the axial direction, and the other face is on an incline.
  • a rear clutch protrusion 63A is provided on the outer peripheral portion of the rear clutch 63 to make contact with the mast housing 34 and stop the rotation. The rear clutch 63 is pushed against the front clutch 64 by the rear clutch spring 66.
  • a cylindrical front clutch 64 is provided around the pulling head 30 in front of the rear clutch 63.
  • the front clutch 64 is connected so as to rotate with the pulling head 30.
  • the front clutch 64 has saw teeth in the rear facing the rear clutch 63.
  • One face of the saw teeth in the front clutch 64 is parallel to the axial direction, and the other face is on an incline to engage the saw teeth of the rear clutch 63.
  • the rear clutch protrusion 63A makes contact with the mast housing 34, and the rear clutch 63 no longer rotates.
  • the front clutch 64 begins to rotate, the rear clutch 63 cannot be rotated by the mast housing 34 but instead moves in the direction of arrow 41 (the rear direction) against the action of the rear clutch spring 66, and the front clutch 64 and the rear clutch 63 disengage.
  • the pulling head 30, the jaw case 32, and the front clutch 64 rotate but do not move forward.
  • the spindle 14 does not stop rotating in the reverse direction when the pulling head 30 has returned to the home position HP, the pulling head 30, the jaw case 32, and the front clutch 64 rotate, and the rear clutch 63 moves to the rear. Because the front clutch 64 does not obstruct the rotation of the rear clutch 63, the ball screw shaft 36 is allowed to rotate, and the pulling head 30 can be kept from moving forward beyond the home position HP.
  • the power transmission controller 11 rotates the electric motor 13 in the forward direction, stops the motor, and rotates the motor in the reverse direction.
  • the motor shaft of the electric motor 13 rotates
  • the motor gear 15 and the rear gear 19 rotate the second shaft 18.
  • the front gear 21 and the spindle gear 17 rotate the spindle 14.
  • the ball screw nut 44 rotates, and the ball screw shaft 36 moves in the axial direction.
  • the pulling head 30 is drawn backward or returns forward.
  • FIG. 8 is a block diagram of the power transmission controller.
  • the control circuit 55 shown in FIG. 8 controls the electric motor 13, the pulling head 30 in the nose 7 retreats from the home position HP at the front of the blind rivet fastening mechanism 2 to the rear position RP where the mandrel shaft of the blind rivet is broken. The head stops at the rear position RP, and then advances from the rear position RP to the home position HP at the front end.
  • the rotation count of the electric motor 13 is detected by the Hall element 13A, and rotation count signals (R) regarding the electric motor 13 are outputted by the electronic circuit 13B to the control circuit 55 serving as the control means.
  • ON/OFF signals from the trigger switch 49 turned ON and OFF by squeezing and releasing the trigger 6 are inputted to the control circuit 55.
  • a signal processor 55A is provided in the control circuit 55.
  • the signal processor 55A receives the rotation count signals (R) from the electric motor 13 and ON/OFF signals (T) from the trigger switch 49, and outputs forward rotation signals (SN), stop signals (SS) and reverse rotation signals (SR). These signals cause the electric motor 13 to rotate in the forward direction, stop, or rotate in the reverse direction.
  • a driver 55B is also provided in the control circuit 55.
  • the driver 55B receives forward rotation signals (SN), stop signals (SS) and reverse rotation signals (SR) from the signal processor 55A, and controls the supply of power from the battery 51 to the electric motor 13 to rotate the motor in the forward direction, stop the motor, or rotate the motor in the reverse direction.
  • the signal processor 55A and driver 55B constituting the control circuit 55 are arranged inside the handle 3.
  • the pulling head 30 Because power is supplied from the battery 51 to the electric motor 13, the pulling head 30 is positioned at the home position HP in the front of the blind rivet fastening mechanism 2 (the position in FIG. 3 ). When the pulling head 30 is at the home position HP, the rotation count of the electric motor 13 is reduced to zero. When the rotation count of the electric motor 13 is zero while an ON signal is not being outputted (or OFF signal is being outputted) from the trigger switch 49 of the trigger 6, the pulling head 30 is at the home position HP. The electric motor 13 stops operating and the pulling head 30 is at the home position HP even when power is being supplied from the battery 51 to the electric motor 13 as long as the trigger 6 is not activated. An OFF signal (TOFF) from the trigger switch 49 of the trigger 6 and a rotation count of zero from the electric motor 13 indicate to the control circuit that the fastening device 1 is at the home position HP, and a stop signal (SS) is outputted.
  • TOFF OFF signal
  • an ON signal (TON) is outputted from the trigger switch 49, and the signal processor 55A in the control circuit 55 provided in the electric blind rivet fastening device 1 outputs a forward rotation signal (SN) to rotate the electric motor 13 in the forward direction.
  • the driver 55B receives the forward rotation signal (SN)
  • the driver 55B sends power from the battery 51 to the electric motor 13, and the electric motor 13 is rotated in the forward direction.
  • the rotation is transmitted to the spindle 14 via the motor gear 15, the rear gear 19, the second shaft 18, the front gear 21 and the spindle gear 17, and the spindle 14 rotates in the forward direction.
  • the forward rotation of the spindle 14 causes the ball screw shaft 36 ( FIG. 3 ) to retreat in the axial direction, and the pulling head 30 to retreat in the axial direction a predetermined length from the home position HP at the front end (the length required to break the mandrel shaft).
  • This retreating action causes the jaw 29 to retreat from the front position, and for the shaft J of the mandrel M of the blind rivet gripped in the jaw 29 to be drawn back.
  • the drawing back action causes the mandrel shaft J to break, the mandrel head H to deform and widen a portion of the sleeve S of the rivet body R, and the fastened members to be strongly interposed between the flange F of the rivet body R and the deformed portion of the sleeve.
  • a plurality of fastened members such as an automotive body panel and automotive component have been strongly interposed between the deformed sleeve and the flange F, the rivet body R is fastened to the fastened members, and the automotive component is mounted on the automotive body panel.
  • the motor gear 15 and the rear gear 19 cause the second shaft 18 to rotate in the reverse direction.
  • the spindle 14 rotates in the forward direction, and the pulling head 30 moves in the axial direction.
  • the position of the pulling head 30 in the axial direction is determined by the rotation count of the electric motor 13 detected by the Hall element 13A.
  • the rotation count signals from the electronic circuit 13B is used to determine the rotation count of the brushless motor 13. Because the trigger 6 is being operated, an ON signal (TON) is outputted from the trigger switch 49.
  • the signal processor 55A of the control circuit 55 receives an ON signal (TON) from the trigger switch 49 and the predetermined rotation count from the electric motor 13, and outputs a stop signal.
  • the driver 55B receives the stop signal (SS) to stop the rotation of the electric motor 13 (stopping the motor using braking or regenerative braking).
  • the ON signal (TON) from the trigger switch 49 of the trigger 6 is eliminated (or an OFF signal is outputted).
  • the signal processor 55A in the control circuit 55 receives an OFF signal (TOFF) from the trigger switch 49, the predetermined count is received from the electric motor 13, and a reverse rotation signal (SR) is outputted.
  • the driver 55B receives the reverse rotation signal (SR) and rotates the electric motor 13 in the reverse direction.
  • the control circuit 55 receives an OFF signal (TOFF) from the trigger switch 49 and a zero rotation count signal from the electric motor 13, and outputs a stop signal (SS).
  • TOFF OFF signal
  • SS stop signal
  • the signal processor 55A in the control circuit 55 receives a rotation count signal (R) from the electric motor 13 and an OFF signal (TOFF) from the trigger switch 49, and sends a reverse rotation signal (SR) to the driver 55B.
  • the driver 55B then rotates the electric motor 13 in the reverse direction.
  • the reverse rotation of the electric motor 13 continues until the rotation count of the electric motor 13 reaches zero and the pulling head 30 (jaw 29) has been returned to the home position HP at the front end of the blind rivet fastening mechanism 2.
  • the pulling head 30 can be returned to the home position HP even if, for some reason, the blind rivet fastening operation has been suspended. Therefore, when the blind rivet fastening operation is ended prematurely, the blind rivet fastening operation can be suspended by simply releasing the trigger 6.
  • the first clutch can be released and the rear position RP to keep the pulling head 30 from being drawn back too far. If, for some reason, the spindle 14 does not stop rotating in the reverse direction when the pulling head 30 has returned to the home position HP and excessive torque is applied, the second clutch slips, the pulling head 30 rotates with the spindle 14 in the reverse direction, and the pulling head 30 is kept from extending forward from the home position HP. If, for some reason, the pulling head 30 is about to advance beyond the home position HP, the spindle 14 continues rotating in the reverse direction and the pulling head 30 is kept from advancing beyond the home position HP. Here, the second clutch slips at the home position HP, and the pulling head 30 is positioned at the home position HP.
  • the embodiment of the present invention is able to increase the capacity of the collection chamber for collecting broken mandrels. It is also able to avoid excessive force due to an over stroke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)

Claims (7)

  1. Elektrische Blindnietbefestigungsvorrichtung (1) zur Verformung einer Hülse eines Nietkörpers, damit ein Mandrell eines Blindniets, der ein Mandrell und einen Nietkörper einschließt, durch Ziehen, in der axialen Richtung, diametral erweitert wird, wodurch der Nietkörper über den erweiterten Hülsenabschnitt und einen Flansch des Nietkörpers an einem montierten Bauelement befestigt und das Mandrell gebrochen wird, wobei die Blindnietbefestigungsvorrichtung umfasst:
    einen elektrischen Motor (13), der an einem Ende bereitgestellt ist;
    Kraftübertragungsmittel (11) zum Übertragen einer Drehung des elektrischen Motors;
    eine Spindel (14), die vor dem elektrischen Motor bereitgestellt ist und durch die von den Kraftübertragungsmitteln übertragene Kraft gedreht wird;
    eine Auffangkammer (10) zum Auffangen der gebrochenen Mandrellwellenabschnitte, wobei die Kammer zwischen dem elektrischen Motor und der Spindel bereitgestellt ist;
    eine Kugelgewindemutter, die an die Spindel angrenzt und mit der Spindel verbunden ist und durch diese gedreht wird;
    eine Kugelgewindewelle (36), die in einem zentralen Abschnitt der Kugelgewindemutter in der axialen Richtung bereitgestellt ist und durch die Drehung der Kugelgewindemutter in der axialen Richtung bewegt wird;
    Ziehmittel (30, 32), die mit der Kugelgewindewelle verbunden sind, zum Greifen und Ziehen eines Wellenabschnitts des Mandrells, wobei die Ziehmittel einen Ziehkopf (30) umfassen, wobei sich der Ziehkopf (30) zwischen einer Ausgangsposition HP an dem vorderen Ende und einer hinteren Position RP, in der das Mandrell gebrochen wird, bewegt;
    ein Hall-Element (13A) zum Erfassen der Drehungsanzahl des elektrischen Motors, wobei die Position des Ziehkopfes (30) in der axialen Richtung durch die Drehung des elektrischen Motors (13) bestimmt wird, die durch das Hall-Element erfasst wird;
    einen Auslöser (6), der in einem Griffabschnitt (3) bereitgestellt ist; wobei die elektrische Blindnietbefestigungsvorrichtung dadurch gekennzeichnet ist, dass der elektrische Motor ein bürstenloser Motor ist; und dadurch, dass sie ferner umfasst
    Steuermittel zum Steuern der Vorwärtsdrehung, Rückwärtsdrehung und dem Anhalten des elektrischen Motors basierend auf einer Betätigung des Auslösers und der Hall-Element-Drehungsanzahl des elektrischen Motors; und
    eine erste Kupplung (61, 62), die aus einer Spindelkupplung (61) und einer Mutterkupplung (62) besteht, in dem Abschnitt zwischen der Spindel (14) und der Kugelgewindemutter (44) bereitgestellt ist, und eine zweite Kupplung (63, 64), die aus einer hinteren Kupplung (63) und einer vorderen Kupplung (64) besteht, vor der Kugelgewindewelle (36) bereitgestellt ist, wobei die erste und die zweite Kupplung bereitgestellt sind, um zu verhindern, dass übermäßig hohes Drehmoment den Ziehkopf (30) über den durch die Ausgangsposition HP und die hintere Position RP definierten Bereich hinaus bewegt.
  2. Elektrische Blindnietbefestigungsvorrichtung nach Anspruch 1, wobei die Ziehmittel umfassen:
    einen Ziehkopf (30), der durch ein Bewegen der Kugelgewindewelle in der axialen Richtung in die axiale Richtung bewegt wird;
    ein Futtergehäuse (32), das an den Ziehkopf angrenzt, in dem Ziehkopf integriert ist und eine innere Umfangsfläche aufweist, deren Innendurchmesser in Richtung des vorderen Endes abnimmt;
    eine Futterbacke (29), die innerhalb des Futtergehäuses bereitgestellt ist und eine äußere Umfangsfläche aufweist, die in Kontakt mit der inneren Umfangsfläche des Futtergehäuses steht; und
    ein Ansatzstück (31), das an die Futterbacke angrenzt und einen Öffnungsabschnitt aufweist, durch den der Wellenabschnitt des Mandrells verläuft.
  3. Elektrische Blindnietbefestigungsvorrichtung nach Anspruch 1 oder Anspruch 2, wobei die Kraftübertragungsmittel umfassen:
    ein Motorritzel (15), das mit dem elektrischen Motor verbunden ist; ein hinteres Zahnrad (19), das unter dem Motorritzel bereitgestellt ist und das Motorritzel in Eingriff nimmt; ein Spindelzahnrad (17), das die Spindel in Eingriff nimmt; ein vorderes Zahnrad (21), das unter dem Spindelzahnrad bereitgestellt ist und das Spindelzahnrad in Eingriff nimmt; eine zweite Welle (8), die unter der Auffangkammer bereitgestellt ist und mit dem hinteren Zahnrad und dem vorderen Zahnrad einstückig verbunden ist.
  4. Elektrische Blindnietbefestigungsvorrichtung nach einem der Ansprüche 1 bis 3, wobei die erste Kupplung beinhaltet:
    die Spindelkupplung (61), die einen zylindrischen Abschnitt und einen fächerförmigen Abschnitt, der sich in Bezug auf die Spindel in der axialen Richtung bewegen kann, aufweist und sich mit der Spindel dreht; und
    die Mutterkupplung (62), die einen fächerförmigen Abschnitt, der den fächerförmigen Abschnitt der Spindelkupplung in Eingriff nimmt, aufweist und mit der Kugelgewindemutter einstückig verbunden ist;
    die erste Kupplung, die sich von der Spindelkupplung und der Mutterkupplung lösen kann, damit die Drehung der Spindel während einer Vorwärtsdrehung des elektrischen Motors an einer hinteren Begrenzung (RP) der Kugelgewindewelle nicht auf die Kugelgewindemutter übertragen wird.
  5. Elektrische Blindnietbefestigungsvorrichtung nach Anspruch 4, wobei ein hervorstehender Abschnitt eines Zylinderendes (45), der mit dem hinteren Ende der Kugelgewindewelle einstückig verbunden ist, eine innere Endfläche der Spindelkupplung in der axialen Richtung nach hinten drückt und sich der fächerförmige Abschnitt der Spindelkupplung von dem fächerförmigen Abschnitt der Mutterkupplung löst, wenn die Kugelgewindewelle die hintere Begrenzung in der axialen Richtung erreicht.
  6. Elektrische Blindnietbefestigungsvorrichtung nach einem der vorstehenden Ansprüche, wobei die zweite Kupplung beinhaltet:
    die hintere Kupplung (63), die eine zylindrische Form und Sägezähne an dem vorderen Ende aufweist und angeordnet ist, damit sie sich in der axialen Richtung um den Ziehkopf herum bewegen, sich jedoch nicht drehen kann; und
    die vordere Kupplung (64), die eine zylindrische Form und Sägezähne an dem hinteren Ende, die die Sägezähne der hinteren Kupplung in Eingriff nehmen, aufweist und vor der hinteren Kupplung, um den Ziehkopf herum, angeordnet ist und mit dem Ziehkopf einstückig verbunden ist.
  7. Elektrische Blindnietbefestigungsvorrichtung nach Anspruch 6, wobei die Sägezähne der hinteren Kupplung eine Seite, die in der axialen Richtung parallel zu der hinteren Kupplung ist, und eine andere Seite, die in Bezug auf die axiale Richtung geneigt ist, aufweisen; und wobei die Sägezähne der vorderen Kupplung eine Form aufweisen, die es ermöglicht, die Sägezähne der hinteren Kupplung in Eingriff zu nehmen.
EP13797276.6A 2012-05-31 2013-03-01 Blindnietbefestigungswerkzeug Active EP2855046B8 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012124750A JP5928803B2 (ja) 2012-05-31 2012-05-31 ブラインドリベット締結装置
PCT/US2013/028573 WO2013180769A1 (en) 2012-05-31 2013-03-01 Blind rivet fastening device

Publications (4)

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EP2855046A1 EP2855046A1 (de) 2015-04-08
EP2855046A4 EP2855046A4 (de) 2016-03-02
EP2855046B1 true EP2855046B1 (de) 2018-04-25
EP2855046B8 EP2855046B8 (de) 2020-05-27

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JP (1) JP5928803B2 (de)
CN (1) CN104903022B (de)
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EP2985093B1 (de) 2014-08-15 2019-05-29 GESIPA Blindniettechnik GmbH Blindnietsetzgerät und Verfahren zum Setzen eines Blindniets
JP6836370B2 (ja) * 2016-11-07 2021-03-03 ポップリベット・ファスナー株式会社 ブラインドリベット締結装置
JP6804952B2 (ja) 2016-11-30 2020-12-23 株式会社マキタ 締結工具
WO2018101181A1 (ja) 2016-11-30 2018-06-07 株式会社マキタ 締結工具
JP6863723B2 (ja) 2016-11-30 2021-04-21 株式会社マキタ 締結工具
JP6716844B2 (ja) * 2016-12-28 2020-07-01 株式会社マキタ 締結工具
WO2018131577A1 (ja) 2017-01-13 2018-07-19 株式会社マキタ 締結工具
TWI656923B (zh) * 2018-07-24 2019-04-21 朝程工業股份有限公司 電動拉釘槍
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JP7187339B2 (ja) 2019-01-30 2022-12-12 ポップリベット・ファスナー株式会社 ブラインドナット締結装置
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Also Published As

Publication number Publication date
EP2855046B8 (de) 2020-05-27
JP2013248643A (ja) 2013-12-12
JP5928803B2 (ja) 2016-06-01
EP2855046A1 (de) 2015-04-08
EP2855046A4 (de) 2016-03-02
CN104903022B (zh) 2017-09-01
TW201350284A (zh) 2013-12-16
CN104903022A (zh) 2015-09-09
WO2013180769A1 (en) 2013-12-05
TWI581921B (zh) 2017-05-11

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