WO2023171086A1 - Screw tightening device, and screw holding unit - Google Patents

Screw tightening device, and screw holding unit Download PDF

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Publication number
WO2023171086A1
WO2023171086A1 PCT/JP2022/047196 JP2022047196W WO2023171086A1 WO 2023171086 A1 WO2023171086 A1 WO 2023171086A1 JP 2022047196 W JP2022047196 W JP 2022047196W WO 2023171086 A1 WO2023171086 A1 WO 2023171086A1
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Prior art keywords
screw
bit
tip
holding unit
tightening device
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PCT/JP2022/047196
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French (fr)
Japanese (ja)
Inventor
正行 吉村
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株式会社フォーワード
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Publication of WO2023171086A1 publication Critical patent/WO2023171086A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/12—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using magnetic means

Definitions

  • This specification discloses a technology related to a screw tightening device and a screw holding unit.
  • Cited Document 1 discloses a screw mounting device for tightening a magnetic screw having a tool hole in its head.
  • the screw tightening device of Cited Document 1 rotates and presses a magnetic screwdriver bit against a screw floated by air pressure. to be adsorbed. After that, the screw tightening device of Cited Document 1 moves the screwdriver bit with the screw attracted to the work area, and processes the screw by rotating it while pressing the screw attracted to the driver bit toward the workpiece. Tighten the screw against the object.
  • the technology disclosed in this specification can be realized as the following form.
  • One form disclosed in this specification is a screw tightening device that tightens a magnetic screw having a tool hole in its head.
  • This screw tightening device is configured to include: a rod-shaped driver bit having a bit tip that fits into the tool hole; a bit holder that holds the driver bit; and a screw that can be held coaxially with the driver bit. and a screw holding unit.
  • the screw holding unit includes a connecting portion that connects to the bit holder; a body that has a cylindrical shape that covers the outer periphery of the driver bit and extends from the connecting portion to a length longer than the position of the tip of the bit; and the connecting portion.
  • the tip of the screw holding unit and the tip of the body constitute the tip of the magnetic body that comes into contact with the magnet at the end facing toward the section, and protrudes from the head of the screw toward the shaft of the screw. and an adsorbing portion having a shape that fits around the outer periphery of the head of the screw, and having a magnetic force capable of adsorbing the screw with the magnet.
  • the barrel is configured to be able to contract in the axial direction when subjected to pressure in the axial direction to a position where the bit tip fits into the tool hole of the screw that is sucked by the suction portion.
  • a screw tightening device that tightens a magnetic screw having a tool hole in its head.
  • This screw tightening device is configured to include: a rod-shaped driver bit having a bit tip that fits into the tool hole; a bit holder that holds the driver bit; and a screw that can be held coaxially with the driver bit. and a screw holding unit.
  • the screw holding unit includes a connecting portion that connects to the bit holder; a body that has a cylindrical shape that covers the outer periphery of the driver bit and extends longer than the tip of the bit; and the body.
  • the screw has a suction portion that has a shape that fits around the outer periphery of the head of the screw and has a magnetic force capable of suctioning the screw.
  • the barrel is configured to be able to contract in the axial direction when subjected to pressure in the axial direction to a position where the bit tip fits into the tool hole of the screw that is sucked by the suction portion.
  • this type of screw tightening device by fitting the outer periphery of the screw head into the suction part of the screw holding unit and suctioning it, the tip of the bit is aligned coaxially with the driver bit before it fits into the tool hole. Since the screw can be positioned, it is possible to prevent a situation in which the tool hole does not fit into the tip of the bit and the screw cannot be tightened.
  • the technology disclosed in this specification can be realized in various forms different from screw tightening devices.
  • the technology disclosed in this specification can be realized, for example, in the form of a screw holding unit or a method of tightening a screw.
  • FIG. 1 is an explanatory diagram showing the configuration of a screw tightening device 100.
  • FIG. FIG. 2 is an explanatory diagram showing a detailed configuration of a screw holding unit 200.
  • FIG. FIG. 3 is an explanatory diagram showing the operation of the screw tightening device 100.
  • FIG. 1 is an explanatory diagram showing the configuration of a screw tightening device 100.
  • the screw tightening device 100 is a device that tightens the screw 300, and is also called a nut runner.
  • the screw tightening device 100 is a stationary manufacturing device installed in a manufacturing line for manufacturing industrial products.
  • FIG. 1 shows a portion of the screw tightening device 100, centering on a portion that contacts the screw 300.
  • the screw tightening device 100 includes a drive shaft 110, a bit holder 120, a driver bit 130, and a screw holding unit 200 for tightening a screw 300.
  • FIG. 1(a) shows how the screw holding unit 200 is attached to the screw tightening device 100.
  • FIG. 1B shows how a screw 300 is attracted to a screw holding unit 200 attached to a screw tightening device 100.
  • the screw holding unit 200 in FIG. 1(b) is shown in a half-sectional view.
  • the XYZ axes in FIG. 1 are a coordinate system showing the positional relationship of each part in the screw tightening device 100.
  • the X-axis and Y-axis in FIG. 1 are axes parallel to the horizontal direction.
  • the Z axis in FIG. 1 is an axis parallel to the vertical direction, the +Z axis direction is vertically upward, and the -Z axis direction is vertically downward.
  • the XYZ axes in FIG. 1 correspond to the XYZ axes in other figures.
  • the screw 300 handled by the screw tightening device 100 is a screw having a tool hole 312 in the head 310.
  • the screw 300 is a magnetic material whose main component is iron.
  • a cylindrical shaft portion 320 having an axis AX3 as its axis extends from the head 310 of the screw 300 to the screw tip 330.
  • the shaft portion 320 is formed with a thread.
  • the head 310 has a flanged truss shape
  • the tool hole 312 has a hexalobular shape.
  • the drive shaft 110 of the screw tightening device 100 is a cylindrical component whose axis is an axis AX1 parallel to the Z-axis direction.
  • the end of the drive shaft 110 on the ⁇ Z-axis direction side is configured to allow a bit holder 120 to be attached and detached.
  • the drive shaft 110 is configured to be movable in each of the X-axis direction, the Y-axis direction, and the Z-axis direction by a drive motor (not shown) included in the screw tightening device 100.
  • the drive shaft 110 is configured to be rotatable about an axis AX1 by a drive motor (not shown) included in the screw tightening device 100.
  • the bit holder 120, driver bit 130, and screw holding unit 200 attached to the drive shaft 110 move and rotate together with the drive shaft 110.
  • the bit holder 120 of the screw tightening device 100 is a cylindrical tool that holds a driver bit 130.
  • the end of the bit holder 120 on the +Z-axis direction side is configured to be detachable from the drive shaft 110.
  • the bit holder 120 attached to the drive shaft 110 is located coaxially with the drive shaft 110.
  • the end of the bit holder 120 on the ⁇ Z-axis direction side is configured to allow a driver bit 130 to be attached and detached thereto.
  • the bit holder 120 is a magnetic material whose main component is iron, and is configured to be able to hold the screw holding unit 200 by the attraction force generated by the magnetic force of the screw holding unit 200.
  • the driver bit 130 of the screw tightening device 100 is a rod-shaped tool that fits into the tool hole 312 of the screw 300 and rotates the screw 300.
  • the end of the driver bit 130 on the +Z-axis direction side is configured to be detachable from the bit holder 120.
  • the driver bit 130 attached to the bit holder 120 is located coaxially with the drive shaft 110 and the bit holder 120.
  • the driver bit 130 is a magnetic material whose main component is iron, and is magnetized to be able to attract the screw 300. In other embodiments, driver bit 130 may be demagnetized so that it does not attract screw 300.
  • the driver bit 130 has a bit tip 132, a bit body 134, and a shank 136.
  • the bit tip 132 has a tip shape (hexalobular shape in this embodiment) that fits into the tool hole 312 of the screw 300.
  • the bit body 134 is a cylindrical portion that connects the bit tip 132 and the shank 136.
  • the shank 136 has a shape (in this embodiment, a hexagonal column shape) that can be attached to and detached from the bit holder 120.
  • FIG. 2 is an explanatory diagram showing the detailed configuration of the screw holding unit 200.
  • FIG. 2(a) shows a plan view of the screw holding unit 200 viewed from the +Z-axis direction.
  • FIG. 2(b) shows a front view of the screw holding unit 200 viewed from the +Y-axis direction.
  • FIG. 2(c) shows a bottom view of the screw holding unit 200 viewed from the ⁇ Z-axis direction.
  • FIG. 2(d) shows a cross-sectional view of the screw holding unit 200 taken along the axis AX2.
  • FIG. 3 is an explanatory diagram showing the operation of the screw tightening device 100.
  • FIG. 3A shows how the screw 300 is held by the screw holding unit 200.
  • FIG. 3B shows how the screw 300 held by the screw holding unit 200 is tightened to the workpiece OP.
  • the screw holding unit 200 of the screw tightening device 100 is a cylindrical component whose axis is centered on an axis AX2 parallel to the Z-axis direction.
  • the screw holding unit 200 is configured to be able to hold the screw 300 coaxially with the driver bit 130.
  • a through hole TH through which the driver bit 130 passes is formed inside the screw holding unit 200.
  • the screw holding unit 200 is configured to be attachable to the bit holder 120 to which the driver bit 130 is attached.
  • the screw holding unit 200 attached to the bit holder 120 is located coaxially with the drive shaft 110, the bit holder 120, and the driver bit 130.
  • the screw holding unit 200 includes a screw attraction guide 210, a screw attraction magnet 220, a sleeve 230, a coil spring 240, a base 250, and a holder attraction magnet 260.
  • the holder attracting magnet 260 constitutes a connecting portion CN that is connected to the bit holder 120.
  • the screw suction guide 210, the sleeve 230, and the base 250 have a cylindrical shape that covers the outer periphery of the driver bit 130, and have a body extending longer than the bit tip 132 of the driver bit 130 from the connection part CN with the bit holder 120.
  • Part BD is configured.
  • the tip 212 of the screw suction guide 210 constitutes a suction section AS.
  • the suction part AS constitutes the tip of the body part BD, and has a shape that fits into the outer periphery of the head 310 of the screw 300 (see FIG. 3(a)).
  • the suction portion AS has a magnetic force capable of suctioning the screw 300.
  • the bit tip 132 of the driver bit 130 When the body BD is not pressed in the axial direction (Z-axis direction) along the axis AX2, the bit tip 132 of the driver bit 130 is located away from the screw 300 that is attracted to the attraction part AS. (See Figure 3(a)).
  • the bit tip 132 of the body BD fits into the tool hole 312 of the screw 300 that is attracted to the suction part AS. It is configured to be able to contract in the axial direction (Z-axis direction) to a matching position (see FIG. 3(b)).
  • the screw suction guide 210 of the screw holding unit 200 has a cylindrical shape centered on the axis AX2, and is a part of the body portion BD.
  • the inner periphery of the screw suction guide 210 constitutes a through hole TH through which the driver bit 130 is passed.
  • a female threaded portion 214 that fits into the sleeve 230 is formed on the inner circumference of the screw suction guide 210 on the +Z-axis direction side.
  • a tip portion 212 that constitutes the suction portion AS is formed at the tip of the screw suction guide 210 on the ⁇ Z-axis direction side.
  • the screw attraction guide 210 is a magnetic material whose main component is iron, and has a magnetic force that allows the screw 300 to be attracted to the tip portion 212 by the screw attraction magnet 220 .
  • the tip portion 212 fits into the outer periphery of the truss shape while coming into contact with the flange of the head 310 of the screw 300 (see FIG. 3(a)).
  • the screw attraction magnet 220 of the screw holding unit 200 is a magnet that exerts a magnetic force that can attract the screw 300 to the screw attraction guide 210.
  • the screw attraction magnet 220 is a cylindrical neodymium magnet, and is fitted onto the outside of the sleeve 230 at a position where it contacts the +Z-axis direction side of the screw attraction guide 210, and is attached to the screw attraction guide 210 by a coil spring 240. Being forced.
  • the sleeve 230 of the screw holding unit 200 has a cylindrical shape centered on the axis AX2, and is a component that constitutes the body portion BD.
  • the inner periphery of the sleeve 230 constitutes a through hole TH through which the driver bit 130 passes.
  • a male threaded portion 234 that fits into the female threaded portion 214 of the screw suction guide 210 is formed on the outer periphery of the sleeve 230 on the ⁇ Z-axis direction side.
  • a flange portion 236 that protrudes outward is formed on the outer periphery of the sleeve 230 on the +Z-axis direction side.
  • the flange portion 236 is movable along the Z-axis direction inside the base 250, and prevents the sleeve 230 from coming off from the base 250 in the ⁇ Z-axis direction by engaging with the protruding portion 256 of the base 250.
  • the coil spring 240 of the screw holding unit 200 is a component that biases the body portion BD into an expanded state.
  • the coil spring 240 is fitted to the outside of the sleeve 230 and is sandwiched between the screw attracting magnet 220 and the base 250, and presses the base 250 in the +Z-axis direction.
  • the flange portion 236 of the sleeve 230 is held in a state of contact with the protruding portion 256 of the base 250 (see FIG. 2(d)).
  • the base 250 of the screw holding unit 200 has a cylindrical shape with the axis AX2 as its center, and is a component that constitutes the body portion BD.
  • the inside of the base 250 forms a through hole TH through which the driver bit 130 passes.
  • a protrusion 256 that protrudes inward is formed on the inner periphery of the base 250 on the ⁇ Z-axis direction side.
  • the holder attracting magnet 260 of the screw holding unit 200 is a magnet that attracts the bit holder 120 by magnetic force, and constitutes the connecting portion CN.
  • the inner periphery of the holder attracting magnet 260 constitutes a through hole TH through which the driver bit 130 passes.
  • the holder attracting magnet 260 is a cylindrical neodymium magnet, and is fitted inside the base 250 on the +Z-axis direction side.
  • a screw supply device (not shown) that supplies the screws 300 with the head 310 facing the +Z-axis direction is provided near the screw tightening device 100.
  • the screw tightening device 100 moves the drive shaft 110, on which the bit holder 120, the driver bit 130, and the screw holding unit 200 are attached, coaxially with the screw 300 on the +Z-axis direction side of the screw 300.
  • the screw tightening device 100 moves the suction part AS toward the screw 300 from the +Z-axis direction side, and causes the suction part AS to suction the head 310 of the screw 300 (see FIG. 1(b) and FIG. 3(a)).
  • the length of the trunk BD in the Z-axis direction is "L1".
  • the screw tightening device 100 moves the drive shaft 110 onto the workpiece OP while the screw 300 is suctioned. Thereafter, the screw tightening device 100 moves the drive shaft 110 in the ⁇ Z-axis direction while rotating the screw 300 in the tightening direction, and presses the screw tip 330 of the screw 300 against the workpiece OP. As shown in FIG.
  • the screwdriver bit is Since the screw 300 can be positioned coaxially with the bit tip 130, it is possible to prevent the tool hole 312 from fitting into the bit tip 132 and being unable to tighten the screw 300.
  • the screw holding unit 200 is applicable not only to stationary manufacturing equipment but also to portable power tools and hand tools.
  • the screw holding unit 200 is not limited to a form that can be attached to and removed from the bit holder 120, but may be formed integrally with at least one of the bit holder 120 and the driver bit 130.
  • the adsorption part AS is not limited to a form in which it is magnetically applied by a permanent magnet, but may be in a form in which the adsorption part AS itself is magnetized, or may be in a form in which it is applied in a magnetic force by an electromagnet.
  • the connecting portion CN is not limited to a form in which it is attracted to the bit holder 120 by a permanent magnet, but may be in a form in which it is mechanically connected to the bit holder 120, or it is attracted to the bit holder 120 by an electromagnet. It may be a form.
  • the connecting portion CN is not limited to the form in which it is connected to the bit holder 120, but may be in the form in which it is connected to the driver bit 130.
  • the bit tip 132 is not limited to a hexalobular screw, but may have a shape corresponding to a tool hole of various screws such as a plus shape, a minus shape, a square hole, a hexagonal hole, etc.
  • the suction part AS is capable of suctioning not only truss-shaped screws with flanges, but also hexagonal, truss-shaped, dish-shaped, pan-shaped, flat-shaped screw heads, etc., with or without flanges. It may be a shape.

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  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

This screw tightening device suppresses a state in which a screw cannot be tightened because a tool hole does not fit onto a tip end portion of a bit. A screw holding unit of the screw tightening device includes a coupling portion, a body portion, and a magnetically attracting portion. The coupling portion couples to a bit holder. The body portion has a cylindrical shape covering an outer periphery of a screwdriver bit, and extends farther from the coupling portion than a position of the tip end portion of the bit. The magnetically attracting portion constitutes a tip end of the body portion, has a shape fitting an outer periphery of a head portion of the screw, and exhibits a magnetic force capable of magnetically attracting the screw. The body portion is configured to be capable of contracting in an axial direction, when pressed in the axial direction, to a position in which the tip end portion of the bit fits into the tool hole of the screw magnetically attracted to the magnetically attracting portion.

Description

ネジ締付装置およびネジ保持ユニットScrew tightening device and screw holding unit
　本明細書は、ネジ締付装置およびネジ保持ユニットに関する技術を開示する。 This specification discloses a technology related to a screw tightening device and a screw holding unit.
　ネジ締付装置は、ネジを締め付ける装置であり、ナットランナーとも呼ばれる。引用文献１には、頭部に工具穴を有する磁性体のネジを締め付けるネジ取付装置について開示されている。引用文献１のネジ締付装置は、空気圧で浮上させたネジに対して、磁力を帯びたドライバービットを回転させながら押し付けることによって、ビット先端部が工具穴に嵌り合った状態でドライバービットにネジを吸着させる。その後、引用文献１のネジ締付装置は、ネジを吸着した状態のドライバービットを作業領域に移動させて、ドライバービットに吸着されているネジを加工対象物に向けて押し付けながら回転させることによって加工対象物に対してネジを締め付ける。 A screw tightening device is a device that tightens screws, and is also called a nut runner. Cited Document 1 discloses a screw mounting device for tightening a magnetic screw having a tool hole in its head. The screw tightening device of Cited Document 1 rotates and presses a magnetic screwdriver bit against a screw floated by air pressure. to be adsorbed. After that, the screw tightening device of Cited Document 1 moves the screwdriver bit with the screw attracted to the work area, and processes the screw by rotating it while pressing the screw attracted to the driver bit toward the workpiece. Tighten the screw against the object.
特開２００１－３８５４６号公報Japanese Patent Application Publication No. 2001-38546
　引用文献１のネジ締付装置では、空気圧で浮上させた不安定なネジに対してドライバービットを回転させながら押し付けるため、ビット先端部に工具穴が嵌り合わずに、ドライバービットの軸に対してネジの軸がズレた状態でネジがビット先端部に吸着されてしまい、ネジを締め付けられない状態になるという問題があった。 In the screw tightening device of Cited Document 1, the screwdriver bit is rotated and pressed against the unstable screw floated by air pressure. There is a problem in that when the axis of the screw is misaligned, the screw is attracted to the tip of the bit, making it impossible to tighten the screw.
　本明細書に開示する技術は、以下の形態として実現できる。
　本明細書に開示する一形態は、頭部に工具穴を有する磁性体のネジを、締め付けるネジ締付装置である。このネジ締付装置は、前記工具穴に嵌り合うビット先端部を有する棒状のドライバービットと；前記ドライバービットを保持するビットホルダと；前記ドライバービットの同軸上に前記ネジを保持可能に構成されたネジ保持ユニットとを備える。前記ネジ保持ユニットは、前記ビットホルダに連結する連結部と；前記ドライバービットの外周を覆う筒状を成し、前記連結部から前記ビット先端部の位置よりも長く延びた胴部と；前記連結部へ向かう側の端部において磁石と接触する磁性体の先端部として前記ネジ保持ユニットの先端かつ前記胴部の先端を構成し、前記ネジの前記頭部より該ネジの軸部側へ突出することなく前記ネジの前記頭部の外周に嵌り合う形状を成し、前記磁石によって前記ネジを吸着可能な磁力を帯びた吸着部とを有する。前記胴部は、軸方向の押圧を受けた場合、前記吸着部に吸着されている前記ネジの前記工具穴へと前記ビット先端部が嵌り合う位置まで軸方向に収縮可能に構成されている。 The technology disclosed in this specification can be realized as the following form.
One form disclosed in this specification is a screw tightening device that tightens a magnetic screw having a tool hole in its head. This screw tightening device is configured to include: a rod-shaped driver bit having a bit tip that fits into the tool hole; a bit holder that holds the driver bit; and a screw that can be held coaxially with the driver bit. and a screw holding unit. The screw holding unit includes a connecting portion that connects to the bit holder; a body that has a cylindrical shape that covers the outer periphery of the driver bit and extends from the connecting portion to a length longer than the position of the tip of the bit; and the connecting portion. The tip of the screw holding unit and the tip of the body constitute the tip of the magnetic body that comes into contact with the magnet at the end facing toward the section, and protrudes from the head of the screw toward the shaft of the screw. and an adsorbing portion having a shape that fits around the outer periphery of the head of the screw, and having a magnetic force capable of adsorbing the screw with the magnet. The barrel is configured to be able to contract in the axial direction when subjected to pressure in the axial direction to a position where the bit tip fits into the tool hole of the screw that is sucked by the suction portion.
　本明細書に開示する一形態は、頭部に工具穴を有する磁性体のネジを、締め付けるネジ締付装置である。このネジ締付装置は、前記工具穴に嵌り合うビット先端部を有する棒状のドライバービットと；前記ドライバービットを保持するビットホルダと；前記ドライバービットの同軸上に前記ネジを保持可能に構成されたネジ保持ユニットとを備える。前記ネジ保持ユニットは、前記ビットホルダに連結する連結部と；前記ドライバービットの外周を覆う筒状を成し、前記連結部から前記ビット先端部の位置よりも長く延びた胴部と；前記胴部の先端を構成し、前記ネジの前記頭部の外周に嵌り合う形状を成し、前記ネジを吸着可能な磁力を帯びた吸着部とを有する。前記胴部は、軸方向の押圧を受けた場合、前記吸着部に吸着されている前記ネジの前記工具穴へと前記ビット先端部が嵌り合う位置まで軸方向に収縮可能に構成されている。
　この形態のネジ締付装置によれば、ネジ保持ユニットの吸着部にネジの頭部の外周を嵌め合わせて吸着することによって、ビット先端部が工具穴に嵌り合う前にドライバービットの同軸上にネジを位置決めできるため、ビット先端部に工具穴が嵌り合わずにネジを締め付けられない状態になることを抑制できる。 One form disclosed in this specification is a screw tightening device that tightens a magnetic screw having a tool hole in its head. This screw tightening device is configured to include: a rod-shaped driver bit having a bit tip that fits into the tool hole; a bit holder that holds the driver bit; and a screw that can be held coaxially with the driver bit. and a screw holding unit. The screw holding unit includes a connecting portion that connects to the bit holder; a body that has a cylindrical shape that covers the outer periphery of the driver bit and extends longer than the tip of the bit; and the body. The screw has a suction portion that has a shape that fits around the outer periphery of the head of the screw and has a magnetic force capable of suctioning the screw. The barrel is configured to be able to contract in the axial direction when subjected to pressure in the axial direction to a position where the bit tip fits into the tool hole of the screw that is sucked by the suction portion.
According to this type of screw tightening device, by fitting the outer periphery of the screw head into the suction part of the screw holding unit and suctioning it, the tip of the bit is aligned coaxially with the driver bit before it fits into the tool hole. Since the screw can be positioned, it is possible to prevent a situation in which the tool hole does not fit into the tip of the bit and the screw cannot be tightened.
　本明細書に開示する技術は、ネジ締付装置とは異なる種々の形態で実現できる。本明細書に開示する技術は、例えば、ネジ保持ユニットの形態のほか、ネジを締め付ける方法などの形態で実現できる。 The technology disclosed in this specification can be realized in various forms different from screw tightening devices. The technology disclosed in this specification can be realized, for example, in the form of a screw holding unit or a method of tightening a screw.
ネジ締付装置１００の構成を示す説明図である。1 is an explanatory diagram showing the configuration of a screw tightening device 100. FIG. ネジ保持ユニット２００の詳細構成を示す説明図である。FIG. 2 is an explanatory diagram showing a detailed configuration of a screw holding unit 200. FIG. ネジ締付装置１００の動作を示す説明図である。FIG. 3 is an explanatory diagram showing the operation of the screw tightening device 100.
　図１は、ネジ締付装置１００の構成を示す説明図である。ネジ締付装置１００は、ネジ３００を締め付ける装置であり、ナットランナーとも呼ばれる。本実施形態では、ネジ締付装置１００は、工業製品を製造する製造ラインに設置された据置型の製造装置である。図１には、ネジ３００に接触する部位を中心とするネジ締付装置１００の一部が図示されている。ネジ締付装置１００は、ネジ３００を締め付ける構成として、駆動軸１１０と、ビットホルダ１２０と、ドライバービット１３０と、ネジ保持ユニット２００とを備える。 FIG. 1 is an explanatory diagram showing the configuration of a screw tightening device 100. The screw tightening device 100 is a device that tightens the screw 300, and is also called a nut runner. In this embodiment, the screw tightening device 100 is a stationary manufacturing device installed in a manufacturing line for manufacturing industrial products. FIG. 1 shows a portion of the screw tightening device 100, centering on a portion that contacts the screw 300. The screw tightening device 100 includes a drive shaft 110, a bit holder 120, a driver bit 130, and a screw holding unit 200 for tightening a screw 300.
　図１（ａ）には、ネジ締付装置１００にネジ保持ユニット２００を装着する様子が図示されている。図１（ｂ）には、ネジ締付装置１００に装着されたネジ保持ユニット２００にネジ３００を吸着する様子が図示されている。図１（ｂ）のネジ保持ユニット２００は、片側断面図によって表されている。図１のＸＹＺ軸は、ネジ締付装置１００における各部の位置関係を示す座標系である。図１のＸ軸およびＹ軸は、水平方向に平行な軸である。図１のＺ軸は、鉛直方向に平行な軸であり、＋Ｚ軸方向は鉛直上向きであり、－Ｚ軸方向は鉛直下向きである。図１のＸＹＺ軸は、他の図におけるＸＹＺ軸に対応する。 FIG. 1(a) shows how the screw holding unit 200 is attached to the screw tightening device 100. FIG. 1B shows how a screw 300 is attracted to a screw holding unit 200 attached to a screw tightening device 100. The screw holding unit 200 in FIG. 1(b) is shown in a half-sectional view. The XYZ axes in FIG. 1 are a coordinate system showing the positional relationship of each part in the screw tightening device 100. The X-axis and Y-axis in FIG. 1 are axes parallel to the horizontal direction. The Z axis in FIG. 1 is an axis parallel to the vertical direction, the +Z axis direction is vertically upward, and the -Z axis direction is vertically downward. The XYZ axes in FIG. 1 correspond to the XYZ axes in other figures.
　ネジ締付装置１００が取り扱うネジ３００は、頭部３１０に工具穴３１２を有するネジである。ネジ３００は、鉄を主成分とする磁性体である。ネジ３００の頭部３１０からネジ先端部３３０に亘って、軸ＡＸ３を軸心とする円柱状の軸部３２０が延びている。軸部３２０には、ねじ山が形成されている。本実施形態では、頭部３１０はフランジ付きのトラス形状を成し、工具穴３１２はヘクサロビュラ形状を成す。 The screw 300 handled by the screw tightening device 100 is a screw having a tool hole 312 in the head 310. The screw 300 is a magnetic material whose main component is iron. A cylindrical shaft portion 320 having an axis AX3 as its axis extends from the head 310 of the screw 300 to the screw tip 330. The shaft portion 320 is formed with a thread. In this embodiment, the head 310 has a flanged truss shape, and the tool hole 312 has a hexalobular shape.
　ネジ締付装置１００の駆動軸１１０は、Ｚ軸方向に平行な軸ＡＸ１を軸心とする円柱状の部品である。駆動軸１１０における－Ｚ軸方向側の端部は、ビットホルダ１２０を着脱可能に構成されている。駆動軸１１０は、ネジ締付装置１００が備える駆動モータ（図示しない）によってＸ軸方向、Ｙ軸方向およびＺ軸方向の各方向に移動可能に構成されている。駆動軸１１０は、ネジ締付装置１００が備える駆動モータ（図示しない）によって軸ＡＸ１を中心に回転可能に構成されている。駆動軸１１０に装着されたビットホルダ１２０、ドライバービット１３０およびネジ保持ユニット２００は、駆動軸１１０と共に移動および回転する。 The drive shaft 110 of the screw tightening device 100 is a cylindrical component whose axis is an axis AX1 parallel to the Z-axis direction. The end of the drive shaft 110 on the −Z-axis direction side is configured to allow a bit holder 120 to be attached and detached. The drive shaft 110 is configured to be movable in each of the X-axis direction, the Y-axis direction, and the Z-axis direction by a drive motor (not shown) included in the screw tightening device 100. The drive shaft 110 is configured to be rotatable about an axis AX1 by a drive motor (not shown) included in the screw tightening device 100. The bit holder 120, driver bit 130, and screw holding unit 200 attached to the drive shaft 110 move and rotate together with the drive shaft 110.
　ネジ締付装置１００のビットホルダ１２０は、ドライバービット１３０を保持する円柱状の工具である。ビットホルダ１２０における＋Ｚ軸方向側の端部は、駆動軸１１０に対して着脱可能に構成されている。駆動軸１１０に装着されたビットホルダ１２０は、駆動軸１１０と同軸上に位置する。ビットホルダ１２０における－Ｚ軸方向側の端部は、ドライバービット１３０を着脱可能に構成されている。ビットホルダ１２０は、鉄を主成分とする磁性体であり、ネジ保持ユニット２００の磁力による吸着力によってネジ保持ユニット２００を保持可能に構成されている。 The bit holder 120 of the screw tightening device 100 is a cylindrical tool that holds a driver bit 130. The end of the bit holder 120 on the +Z-axis direction side is configured to be detachable from the drive shaft 110. The bit holder 120 attached to the drive shaft 110 is located coaxially with the drive shaft 110. The end of the bit holder 120 on the −Z-axis direction side is configured to allow a driver bit 130 to be attached and detached thereto. The bit holder 120 is a magnetic material whose main component is iron, and is configured to be able to hold the screw holding unit 200 by the attraction force generated by the magnetic force of the screw holding unit 200.
　ネジ締付装置１００のドライバービット１３０は、ネジ３００の工具穴３１２に嵌り合ってネジ３００を回転させる棒状の工具である。ドライバービット１３０における＋Ｚ軸方向側の端部は、ビットホルダ１２０に対して着脱可能に構成されている。ビットホルダ１２０に装着されたドライバービット１３０は、駆動軸１１０およびビットホルダ１２０と同軸上に位置する。ドライバービット１３０は、鉄を主成分とする磁性体であり、ネジ３００を吸着可能に着磁されている。他の実施形態では、ドライバービット１３０は、ネジ３００を吸着しないように消磁されていてもよい。 The driver bit 130 of the screw tightening device 100 is a rod-shaped tool that fits into the tool hole 312 of the screw 300 and rotates the screw 300. The end of the driver bit 130 on the +Z-axis direction side is configured to be detachable from the bit holder 120. The driver bit 130 attached to the bit holder 120 is located coaxially with the drive shaft 110 and the bit holder 120. The driver bit 130 is a magnetic material whose main component is iron, and is magnetized to be able to attract the screw 300. In other embodiments, driver bit 130 may be demagnetized so that it does not attract screw 300.
　ドライバービット１３０は、ビット先端部１３２と、ビット胴部１３４と、シャンク１３６とを有する。ビット先端部１３２は、ネジ３００の工具穴３１２に嵌り合う先端形状（本実施形態では、ヘクサロビュラ形状）を成す。ビット胴部１３４は、ビット先端部１３２とシャンク１３６との間を接続する円柱状の部位である。シャンク１３６は、ビットホルダ１２０に着脱可能な形状（本実施形態では、六角柱状）を成す。 The driver bit 130 has a bit tip 132, a bit body 134, and a shank 136. The bit tip 132 has a tip shape (hexalobular shape in this embodiment) that fits into the tool hole 312 of the screw 300. The bit body 134 is a cylindrical portion that connects the bit tip 132 and the shank 136. The shank 136 has a shape (in this embodiment, a hexagonal column shape) that can be attached to and detached from the bit holder 120.
　図２は、ネジ保持ユニット２００の詳細構成を示す説明図である。図２（ａ）には、＋Ｚ軸方向から見たネジ保持ユニット２００の平面図が表されている。図２（ｂ）には、＋Ｙ軸方向から見たネジ保持ユニット２００の正面図が表されている。図２（ｃ）には、－Ｚ軸方向から見たネジ保持ユニット２００の底面図が表されている。図２（ｄ）には、軸ＡＸ２に沿って切断したネジ保持ユニット２００の断面図が表されている。 FIG. 2 is an explanatory diagram showing the detailed configuration of the screw holding unit 200. FIG. 2(a) shows a plan view of the screw holding unit 200 viewed from the +Z-axis direction. FIG. 2(b) shows a front view of the screw holding unit 200 viewed from the +Y-axis direction. FIG. 2(c) shows a bottom view of the screw holding unit 200 viewed from the −Z-axis direction. FIG. 2(d) shows a cross-sectional view of the screw holding unit 200 taken along the axis AX2.
　図３は、ネジ締付装置１００の動作を示す説明図である。図３（ａ）には、ネジ保持ユニット２００にネジ３００が保持されている様子が図示されている。図３（ｂ）には、ネジ保持ユニット２００に保持されているネジ３００を加工対象物ＯＰに対して締め付ける様子が図示されている。 FIG. 3 is an explanatory diagram showing the operation of the screw tightening device 100. FIG. 3A shows how the screw 300 is held by the screw holding unit 200. FIG. 3B shows how the screw 300 held by the screw holding unit 200 is tightened to the workpiece OP.
　ネジ締付装置１００のネジ保持ユニット２００は、Ｚ軸方向に平行な軸ＡＸ２を軸心とする円筒状の部品である。ネジ保持ユニット２００は、ドライバービット１３０の同軸上にネジ３００を保持可能に構成されている。ネジ保持ユニット２００の内側には、ドライバービット１３０を通す貫通孔ＴＨが形成されている。ネジ保持ユニット２００は、ドライバービット１３０が装着されたビットホルダ１２０に対して装着可能に構成されている。ビットホルダ１２０に装着されたネジ保持ユニット２００は、駆動軸１１０、ビットホルダ１２０およびドライバービット１３０と同軸上に位置する。 The screw holding unit 200 of the screw tightening device 100 is a cylindrical component whose axis is centered on an axis AX2 parallel to the Z-axis direction. The screw holding unit 200 is configured to be able to hold the screw 300 coaxially with the driver bit 130. A through hole TH through which the driver bit 130 passes is formed inside the screw holding unit 200. The screw holding unit 200 is configured to be attachable to the bit holder 120 to which the driver bit 130 is attached. The screw holding unit 200 attached to the bit holder 120 is located coaxially with the drive shaft 110, the bit holder 120, and the driver bit 130.
　ネジ保持ユニット２００は、ネジ吸着ガイド２１０と、ネジ吸着磁石２２０と、スリーブ２３０と、コイルスプリング２４０と、ベース２５０と、ホルダ吸着磁石２６０とを備える。ホルダ吸着磁石２６０は、ビットホルダ１２０に連結する連結部ＣＮを構成する。ネジ吸着ガイド２１０、スリーブ２３０およびベース２５０は、ドライバービット１３０の外周を覆う筒状を成し、ビットホルダ１２０との連結部ＣＮからドライバービット１３０のビット先端部１３２の位置よりも長く延びた胴部ＢＤを構成する。 The screw holding unit 200 includes a screw attraction guide 210, a screw attraction magnet 220, a sleeve 230, a coil spring 240, a base 250, and a holder attraction magnet 260. The holder attracting magnet 260 constitutes a connecting portion CN that is connected to the bit holder 120. The screw suction guide 210, the sleeve 230, and the base 250 have a cylindrical shape that covers the outer periphery of the driver bit 130, and have a body extending longer than the bit tip 132 of the driver bit 130 from the connection part CN with the bit holder 120. Part BD is configured.
　ネジ吸着ガイド２１０の先端部２１２は、吸着部ＡＳを構成する。吸着部ＡＳは、胴部ＢＤの先端を構成し、ネジ３００の頭部３１０の外周に嵌り合う形状を成す（図３（ａ）を参照）。吸着部ＡＳは、ネジ３００を吸着可能な磁力を帯びている。 The tip 212 of the screw suction guide 210 constitutes a suction section AS. The suction part AS constitutes the tip of the body part BD, and has a shape that fits into the outer periphery of the head 310 of the screw 300 (see FIG. 3(a)). The suction portion AS has a magnetic force capable of suctioning the screw 300.
　胴部ＢＤが軸ＡＸ２に沿った軸方向（Ｚ軸方向）の押圧を受けていない場合、ドライバービット１３０のビット先端部１３２は、吸着部ＡＳに吸着されているネジ３００から離れた位置にある（図３（ａ）を参照）。胴部ＢＤが軸ＡＸ２に沿った軸方向（Ｚ軸方向）の押圧を受けた場合、胴部ＢＤは、吸着部ＡＳに吸着されているネジ３００の工具穴３１２へとビット先端部１３２が嵌り合う位置まで軸方向（Ｚ軸方向）に収縮可能に構成されている（図３（ｂ）を参照）。 When the body BD is not pressed in the axial direction (Z-axis direction) along the axis AX2, the bit tip 132 of the driver bit 130 is located away from the screw 300 that is attracted to the attraction part AS. (See Figure 3(a)). When the body BD is pressed in the axial direction (Z-axis direction) along the axis AX2, the bit tip 132 of the body BD fits into the tool hole 312 of the screw 300 that is attracted to the suction part AS. It is configured to be able to contract in the axial direction (Z-axis direction) to a matching position (see FIG. 3(b)).
　ネジ保持ユニット２００のネジ吸着ガイド２１０は、軸ＡＸ２を軸心とする円筒状を成し、胴部ＢＤを構成する部品である。ネジ吸着ガイド２１０の内周は、ドライバービット１３０を通す貫通孔ＴＨを構成する。ネジ吸着ガイド２１０における＋Ｚ軸方向側の内周には、スリーブ２３０に嵌り合う雌ネジ部２１４が形成されている。ネジ吸着ガイド２１０の－Ｚ軸方向側の先端には、吸着部ＡＳを構成する先端部２１２が形成されている。ネジ吸着ガイド２１０は、鉄を主成分とする磁性体であり、ネジ吸着磁石２２０によって先端部２１２にネジ３００を吸着可能な磁力を帯びている。本実施形態では、先端部２１２は、ネジ３００の頭部３１０のフランジに当たって接しながらトラス形状の外周に嵌り合う（図３（ａ）を参照）。 The screw suction guide 210 of the screw holding unit 200 has a cylindrical shape centered on the axis AX2, and is a part of the body portion BD. The inner periphery of the screw suction guide 210 constitutes a through hole TH through which the driver bit 130 is passed. A female threaded portion 214 that fits into the sleeve 230 is formed on the inner circumference of the screw suction guide 210 on the +Z-axis direction side. At the tip of the screw suction guide 210 on the −Z-axis direction side, a tip portion 212 that constitutes the suction portion AS is formed. The screw attraction guide 210 is a magnetic material whose main component is iron, and has a magnetic force that allows the screw 300 to be attracted to the tip portion 212 by the screw attraction magnet 220 . In this embodiment, the tip portion 212 fits into the outer periphery of the truss shape while coming into contact with the flange of the head 310 of the screw 300 (see FIG. 3(a)).
　ネジ保持ユニット２００のネジ吸着磁石２２０は、ネジ吸着ガイド２１０にネジ３００を吸着可能な磁力を及ぼす磁石である。本実施形態では、ネジ吸着磁石２２０は、円筒状のネオジム磁石であり、ネジ吸着ガイド２１０の＋Ｚ軸方向側に接触する位置においてスリーブ２３０の外側に嵌め込まれ、コイルスプリング２４０によってネジ吸着ガイド２１０に押し付けられている。 The screw attraction magnet 220 of the screw holding unit 200 is a magnet that exerts a magnetic force that can attract the screw 300 to the screw attraction guide 210. In this embodiment, the screw attraction magnet 220 is a cylindrical neodymium magnet, and is fitted onto the outside of the sleeve 230 at a position where it contacts the +Z-axis direction side of the screw attraction guide 210, and is attached to the screw attraction guide 210 by a coil spring 240. Being forced.
　ネジ保持ユニット２００のスリーブ２３０は、軸ＡＸ２を軸心とする円筒状を成し、胴部ＢＤを構成する部品である。スリーブ２３０の内周は、ドライバービット１３０を通す貫通孔ＴＨを構成する。スリーブ２３０の－Ｚ軸方向側の外周には、ネジ吸着ガイド２１０の雌ネジ部２１４に嵌り合う雄ネジ部２３４が形成されている。スリーブ２３０の＋Ｚ軸方向側の外周には、外側に突出したフランジ部２３６が形成されている。フランジ部２３６は、ベース２５０の内側においてＺ軸方向に沿って移動可能であるとともに、ベース２５０の突出部２５６に係り合うことによってベース２５０からスリーブ２３０が－Ｚ軸方向に抜けることを阻止する。 The sleeve 230 of the screw holding unit 200 has a cylindrical shape centered on the axis AX2, and is a component that constitutes the body portion BD. The inner periphery of the sleeve 230 constitutes a through hole TH through which the driver bit 130 passes. A male threaded portion 234 that fits into the female threaded portion 214 of the screw suction guide 210 is formed on the outer periphery of the sleeve 230 on the −Z-axis direction side. A flange portion 236 that protrudes outward is formed on the outer periphery of the sleeve 230 on the +Z-axis direction side. The flange portion 236 is movable along the Z-axis direction inside the base 250, and prevents the sleeve 230 from coming off from the base 250 in the −Z-axis direction by engaging with the protruding portion 256 of the base 250.
　ネジ保持ユニット２００のコイルスプリング２４０は、胴部ＢＤを伸長した状態に付勢する部品である。本実施形態では、コイルスプリング２４０は、スリーブ２３０の外側に嵌め込まれた状態でネジ吸着磁石２２０とベース２５０との間に挟まれ、ベース２５０を＋Ｚ軸方向に押し付けている。これによって、胴部ＢＤは、軸ＡＸ２に沿った軸方向（Ｚ軸方向）の押圧を受けていない場合、スリーブ２３０のフランジ部２３６がベース２５０の突出部２５６に当たって接する状態に保持される（図２（ｄ）を参照）。 The coil spring 240 of the screw holding unit 200 is a component that biases the body portion BD into an expanded state. In this embodiment, the coil spring 240 is fitted to the outside of the sleeve 230 and is sandwiched between the screw attracting magnet 220 and the base 250, and presses the base 250 in the +Z-axis direction. As a result, when the body portion BD is not pressed in the axial direction (Z-axis direction) along the axis AX2, the flange portion 236 of the sleeve 230 is held in a state of contact with the protruding portion 256 of the base 250 (see FIG. 2(d)).
　ネジ保持ユニット２００のベース２５０は、軸ＡＸ２を軸心とする円筒状を成し、胴部ＢＤを構成する部品である。ベース２５０の内側は、ドライバービット１３０を通す貫通孔ＴＨを構成する。ベース２５０の－Ｚ軸方向側の内周には、内側に突出した突出部２５６が形成されている。 The base 250 of the screw holding unit 200 has a cylindrical shape with the axis AX2 as its center, and is a component that constitutes the body portion BD. The inside of the base 250 forms a through hole TH through which the driver bit 130 passes. A protrusion 256 that protrudes inward is formed on the inner periphery of the base 250 on the −Z-axis direction side.
　ネジ保持ユニット２００のホルダ吸着磁石２６０は、磁力によってビットホルダ１２０に吸着する磁石であり、連結部ＣＮを構成する。ホルダ吸着磁石２６０の内周は、ドライバービット１３０を通す貫通孔ＴＨを構成する。本実施形態では、ホルダ吸着磁石２６０は、円筒状のネオジム磁石であり、ベース２５０の＋Ｚ軸方向側の内側に嵌め込まれている。 The holder attracting magnet 260 of the screw holding unit 200 is a magnet that attracts the bit holder 120 by magnetic force, and constitutes the connecting portion CN. The inner periphery of the holder attracting magnet 260 constitutes a through hole TH through which the driver bit 130 passes. In this embodiment, the holder attracting magnet 260 is a cylindrical neodymium magnet, and is fitted inside the base 250 on the +Z-axis direction side.
　本実施形態では、ネジ締付装置１００の近傍には、頭部３１０を＋Ｚ軸方向側に向けてネジ３００を供給するネジ供給装置（図示しない）が併設されている。ネジ締付装置１００は、ネジ３００よりも＋Ｚ軸方向側において、ビットホルダ１２０、ドライバービット１３０およびネジ保持ユニット２００が装着された駆動軸１１０を、ネジ３００と同軸上に移動させる。その後、ネジ締付装置１００は、＋Ｚ軸方向側から吸着部ＡＳをネジ３００へと移動させて吸着部ＡＳにネジ３００の頭部３１０を吸着させる（図１（ｂ）および図３（ａ）を参照）。図３（ａ）に示すように、胴部ＢＤがＺ軸方向の押圧を受けていない場合、Ｚ軸方向の胴部ＢＤの長さは「Ｌ１」である。 In this embodiment, a screw supply device (not shown) that supplies the screws 300 with the head 310 facing the +Z-axis direction is provided near the screw tightening device 100. The screw tightening device 100 moves the drive shaft 110, on which the bit holder 120, the driver bit 130, and the screw holding unit 200 are attached, coaxially with the screw 300 on the +Z-axis direction side of the screw 300. After that, the screw tightening device 100 moves the suction part AS toward the screw 300 from the +Z-axis direction side, and causes the suction part AS to suction the head 310 of the screw 300 (see FIG. 1(b) and FIG. 3(a)). ). As shown in FIG. 3(a), when the trunk BD is not being pressed in the Z-axis direction, the length of the trunk BD in the Z-axis direction is "L1".
　ネジ３００を吸着部ＡＳに吸着した後、ネジ締付装置１００は、ネジ３００を吸着した状態で駆動軸１１０を加工対象物ＯＰ上に移動させる。その後、ネジ締付装置１００は、ネジ３００を締め付ける方向に回転させながら駆動軸１１０を－Ｚ軸方向に移動させて、加工対象物ＯＰに対してネジ３００のネジ先端部３３０を押し付ける。図３（ｂ）に示すように、加工対象物ＯＰに対してネジ３００のネジ先端部３３０を押し付けることによって、胴部ＢＤがＺ軸方向の押圧を受けた場合、ネジ３００の工具穴３１２へとドライバービット１３０のビット先端部１３２が嵌り合う位置までスリーブ２３０がベース２５０の内側に押し込まれ、Ｚ軸方向の胴部ＢＤの長さは、「Ｌ１」よりもスリーブ２３０の移動量ＤＦだけＺ軸方向に収縮した「Ｌ２」となる。これによって、駆動軸１１０の回転がドライバービット１３０を通じてネジ３００に伝わり、ネジ３００が加工対象物ＯＰに対して締め付けられる。 After suctioning the screw 300 to the suction part AS, the screw tightening device 100 moves the drive shaft 110 onto the workpiece OP while the screw 300 is suctioned. Thereafter, the screw tightening device 100 moves the drive shaft 110 in the −Z-axis direction while rotating the screw 300 in the tightening direction, and presses the screw tip 330 of the screw 300 against the workpiece OP. As shown in FIG. 3(b), when the body BD receives pressure in the Z-axis direction by pressing the screw tip 330 of the screw 300 against the workpiece OP, The sleeve 230 is pushed inside the base 250 to a position where the bit tip 132 of the driver bit 130 is fitted, and the length of the body BD in the Z-axis direction is Z by the amount of movement DF of the sleeve 230 than "L1". It becomes "L2" which is contracted in the axial direction. As a result, the rotation of the drive shaft 110 is transmitted to the screw 300 through the driver bit 130, and the screw 300 is tightened against the workpiece OP.
　以上説明した実施形態によれば、ネジ保持ユニット２００の吸着部ＡＳにネジ３００の頭部３１０の外周を嵌め合わせて吸着することによって、ビット先端部１３２が工具穴３１２に嵌り合う前にドライバービット１３０の同軸上にネジ３００を位置決めできるため、ビット先端部１３２に工具穴３１２が嵌り合わずにネジ３００を締め付けられない状態になることを抑制できる。 According to the embodiment described above, by fitting and adsorbing the outer periphery of the head 310 of the screw 300 to the suction part AS of the screw holding unit 200, the screwdriver bit is Since the screw 300 can be positioned coaxially with the bit tip 130, it is possible to prevent the tool hole 312 from fitting into the bit tip 132 and being unable to tighten the screw 300.
　本明細書に開示する技術は、上述した実施形態、実施例および変形例に限られず、その趣旨を逸脱しない範囲において種々の構成で実現できる。例えば、上述した実施形態、実施例および変形例における技術的特徴のうち、発明の概要の欄に記載した各形態における技術的特徴に対応するものは、上述の課題の一部または全部を解決するために、あるいは、上述の効果の一部または全部を達成するために、適宜、差し替えおよび組み合わせることができる。また、本明細書中に必須なものとして説明されていない技術的特徴については、適宜、削除できる。 The technology disclosed in this specification is not limited to the embodiments, examples, and modifications described above, and can be realized in various configurations without departing from the spirit thereof. For example, among the technical features of the embodiments, examples, and modifications described above, those corresponding to the technical features of each form described in the summary column solve part or all of the above problems. or to achieve some or all of the above-mentioned effects, they can be replaced and combined as appropriate. Furthermore, technical features that are not described as essential in this specification can be deleted as appropriate.
　ネジ保持ユニット２００は、据置型の製造装置に限らず、可搬型の電動工具および手動工具に適用可能である。ネジ保持ユニット２００は、ビットホルダ１２０に着脱可能な形態に限らず、ビットホルダ１２０およびドライバービット１３０の少なくとも一方と一体的に構成された形態であってもよい。 The screw holding unit 200 is applicable not only to stationary manufacturing equipment but also to portable power tools and hand tools. The screw holding unit 200 is not limited to a form that can be attached to and removed from the bit holder 120, but may be formed integrally with at least one of the bit holder 120 and the driver bit 130.
　吸着部ＡＳは、永久磁石によって磁力を帯びる形態に限らず、吸着部ＡＳ自体が着磁されている形態であってもよいし、電磁石によって磁力を帯びる形態であってもよい。 The adsorption part AS is not limited to a form in which it is magnetically applied by a permanent magnet, but may be in a form in which the adsorption part AS itself is magnetized, or may be in a form in which it is applied in a magnetic force by an electromagnet.
　連結部ＣＮは、ビットホルダ１２０に対して永久磁石によって吸着する形態に限らず、ビットホルダ１２０に対して機械的に連結する形態であってもよいし、ビットホルダ１２０に対して電磁石によって吸着する形態であってもよい。連結部ＣＮは、ビットホルダ１２０に連結する形態に限らず、ドライバービット１３０に連結する形態であってもよい。 The connecting portion CN is not limited to a form in which it is attracted to the bit holder 120 by a permanent magnet, but may be in a form in which it is mechanically connected to the bit holder 120, or it is attracted to the bit holder 120 by an electromagnet. It may be a form. The connecting portion CN is not limited to the form in which it is connected to the bit holder 120, but may be in the form in which it is connected to the driver bit 130.
　ビット先端部１３２は、ヘクサロビュラ形状のネジに限らず、プラス形状、マイナス形状、四角穴、六角穴などの各種ネジの工具穴に対応した形状であってもよい。吸着部ＡＳは、フランジ付きのトラス形状のネジに限らず、フランジ付き又はフランジ無しにかかわらず、六角形状、トラス形状、皿状、なべ状、平状などの各種ネジの頭部を吸着可能な形状であってもよい。 The bit tip 132 is not limited to a hexalobular screw, but may have a shape corresponding to a tool hole of various screws such as a plus shape, a minus shape, a square hole, a hexagonal hole, etc. The suction part AS is capable of suctioning not only truss-shaped screws with flanges, but also hexagonal, truss-shaped, dish-shaped, pan-shaped, flat-shaped screw heads, etc., with or without flanges. It may be a shape.
１００…ネジ締付装置
１１０…駆動軸
１２０…ビットホルダ
１３０…ドライバービット
１３２…ビット先端部
１３４…ビット胴部
１３６…シャンク
２００…ネジ保持ユニット
２１０…ネジ吸着ガイド
２１２…先端部
２１４…雌ネジ部
２２０…ネジ吸着磁石
２３０…スリーブ
２３４…雄ネジ部
２３６…フランジ部
２４０…コイルスプリング
２５０…ベース
２５６…突出部
２６０…ホルダ吸着磁石
３００…ネジ
３１０…頭部
３１２…工具穴
３２０…軸部
３３０…ネジ先端部
ＡＳ　…吸着部
ＡＸ１…軸
ＡＸ２…軸
ＡＸ３…軸
ＢＤ　…胴部
ＣＮ　…連結部
ＯＰ　…加工対象物
ＴＨ　…貫通孔 100...Screw tightening device 110...Drive shaft 120...Bit holder 130...Driver bit 132...Bit tip 134...Bit body 136...Shank 200...Screw holding unit 210...Screw suction guide 212...Tip 214...Female thread part 220...Screw attracting magnet 230...Sleeve 234...Male thread part 236...Flange part 240...Coil spring 250...Base 256...Protruding part 260...Holder attracting magnet 300...Screw 310...Head 312...Tool hole 320...Shaft part 330... Screw tip AS...Adsorption part AX1...Axis AX2...Axis AX3...Axis BD...Body part CN...Connection part OP...Workpiece TH...Through hole

Claims (2)

  1. 　頭部に工具穴を有する磁性体のネジを、締め付けるネジ締付装置であって、
    　前記工具穴に嵌り合うビット先端部を有する棒状のドライバービットと、
    　前記ドライバービットを保持するビットホルダと、
    　前記ドライバービットの同軸上に前記ネジを保持可能に構成されたネジ保持ユニットと
    　を備え、
    　前記ネジ保持ユニットは、
    　　前記ビットホルダに連結する連結部と、
    　　前記ドライバービットの外周を覆う筒状を成し、前記連結部から前記ビット先端部の位置よりも長く延びた胴部と、
    　　前記連結部へ向かう側の端部において磁石と接触する磁性体の先端部として前記ネジ保持ユニットの先端かつ前記胴部の先端を構成し、前記ネジの前記頭部より該ネジの軸部側へ突出することなく前記ネジの前記頭部の外周に嵌り合う形状を成し、前記磁石によって前記ネジを吸着可能な磁力を帯びた吸着部と
    　を有し、
    　前記胴部は、軸方向の押圧を受けた場合、前記吸着部に吸着されている前記ネジの前記工具穴へと前記ビット先端部が嵌り合う位置まで軸方向に収縮可能に構成されている、ネジ締付装置。     A screw tightening device for tightening a magnetic screw having a tool hole in the head,
    a rod-shaped driver bit having a bit tip that fits into the tool hole;
    a bit holder that holds the driver bit;
    and a screw holding unit configured to be able to hold the screw on the same axis of the driver bit,
    The screw holding unit is
    a connecting portion that connects to the bit holder;
    a barrel that has a cylindrical shape that covers the outer periphery of the driver bit and extends longer than the position of the tip of the bit from the connecting portion;
    The tip of the screw holding unit and the tip of the body constitute the tip of the magnetic body that comes into contact with the magnet at the end facing the connecting portion, and extends from the head of the screw toward the shaft of the screw. an adsorption part having a shape that fits around the outer periphery of the head of the screw without protruding, and having a magnetic force capable of adsorbing the screw with the magnet;
    The body part is configured to be able to contract in the axial direction when subjected to axial pressure to a position where the bit tip fits into the tool hole of the screw that is attracted to the suction part. Screw tightening device.
  2. 　頭部に工具穴を有する磁性体のネジを、締め付けるネジ締付装置において、前記工具穴に嵌り合うビット先端部を有する棒状のドライバービットの同軸上に前記ネジを保持可能に構成されたネジ保持ユニットであって、
    　前記ドライバービットを保持するビットホルダに連結する連結部と、
    　　前記ドライバービットの外周を覆う筒状を成し、前記連結部から前記ビット先端部の位置よりも長く延びた胴部と、
    　　前記連結部へ向かう側の端部において磁石と接触する磁性体の先端部として前記ネジ保持ユニットの先端かつ前記胴部の先端を構成し、前記ネジの前記頭部より該ネジの軸部側へ突出することなく前記ネジの前記頭部の外周に嵌り合う形状を成し、前記磁石によって前記ネジを吸着可能な磁力を帯びた吸着部と
    　を有し、
    　前記胴部は、軸方向の押圧を受けた場合、前記吸着部に吸着されている前記ネジの前記工具穴へと前記ビット先端部が嵌り合う位置まで軸方向に収縮可能に構成されている、ネジ保持ユニット。     In a screw tightening device for tightening a magnetic screw having a tool hole in the head, the screw holder is configured to be able to hold the screw coaxially with a rod-shaped driver bit having a bit tip that fits into the tool hole. A unit,
    a connecting portion that connects to a bit holder that holds the driver bit;
    a barrel that has a cylindrical shape that covers the outer periphery of the driver bit and extends longer than the position of the tip of the bit from the connecting portion;
    The tip of the screw holding unit and the tip of the body constitute the tip of the magnetic body that comes into contact with the magnet at the end facing the connecting portion, and extends from the head of the screw toward the shaft of the screw. an adsorption part having a shape that fits around the outer periphery of the head of the screw without protruding, and having a magnetic force capable of adsorbing the screw with the magnet;
    The body part is configured to be able to contract in the axial direction when subjected to axial pressure to a position where the bit tip fits into the tool hole of the screw that is attracted to the suction part. Screw holding unit.
PCT/JP2022/047196 2022-03-11 2022-12-21 Screw tightening device, and screw holding unit WO2023171086A1 (en)

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JP7498537B1 (en) 2024-02-06 2024-06-12 Ｓ．Ｐ．エンジニアリング株式会社 Wrench and electric rotary drive

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JPS5966576U (en) * 1982-10-22 1984-05-04 高野　厚子 Screw holder for screwdriver
JPS6257879A (en) * 1985-09-05 1987-03-13 豊田合成株式会社 Driver device
JPH0752055A (en) * 1993-08-09 1995-02-28 Miyauchi Seisakusho:Kk Driver
WO2005000531A1 (en) * 2003-06-25 2005-01-06 Vessel Industrial Co., Ltd. Bit holder device
JP3136333U (en) * 2007-07-19 2007-10-25 モトコマ株式会社 Screw fixing tool for rotary tools

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5966576U (en) * 1982-10-22 1984-05-04 高野　厚子 Screw holder for screwdriver
JPS6257879A (en) * 1985-09-05 1987-03-13 豊田合成株式会社 Driver device
JPH0752055A (en) * 1993-08-09 1995-02-28 Miyauchi Seisakusho:Kk Driver
WO2005000531A1 (en) * 2003-06-25 2005-01-06 Vessel Industrial Co., Ltd. Bit holder device
JP3136333U (en) * 2007-07-19 2007-10-25 モトコマ株式会社 Screw fixing tool for rotary tools

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