JP4808741B2 - Screw tightening detection device - Google Patents

Screw tightening detection device Download PDF

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JP4808741B2
JP4808741B2 JP2008051764A JP2008051764A JP4808741B2 JP 4808741 B2 JP4808741 B2 JP 4808741B2 JP 2008051764 A JP2008051764 A JP 2008051764A JP 2008051764 A JP2008051764 A JP 2008051764A JP 4808741 B2 JP4808741 B2 JP 4808741B2
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main body
screw tightening
body case
screw
driver bit
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JP2009208177A (en
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文也 川村
昌和 吉富
修男 川野
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Nissan Motor Co Ltd
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Description

本発明は、締め付けトルク設定装置を備えた電動やエア駆動のねじ締め機に装着するもので、回転角度を検出してネジ締め不良を検出する装置に関するものである。
The present invention is attached to an electric or air-driven screw tightener equipped with a tightening torque setting device, and relates to a device for detecting a screw tightening defect by detecting a rotation angle.

従来より、ねじを所定のトルクで締め付けることを目的として、締め付けトルク設定装置を備えた動力式のトルクドライバが広く利用されている。トルクドライバは、設定した締め付けトルクに達すると空転したり、クリック感やクリック音を発する構造のものがある。   Conventionally, for the purpose of tightening a screw with a predetermined torque, a power type torque driver equipped with a tightening torque setting device has been widely used. Some torque drivers have a structure that idles or generates a click feeling or a click sound when a set tightening torque is reached.

ねじ締め作業工程においては、部品を所定の適正なトルクでねじ締めする他、品質管理上ねじの種類、ワッシャの有無、斜め締めなど設計通りに作業が行われているかの判定も必要となる場合もある。例えば、特許文献１に示す自動ねじ締め機では、トルクセンサ及びエンコーダを設けることにより、締め付けトルク及びドライバの主軸やドライバビットの回転角度を検出して良否判定を図っている。判定手段としては、通常マイクロコンピュータやシーケンス等により、制御部、記憶手段、入出力インターフェイス等を構成し、多種多様のねじ締め作業に対応できるようにしている。
特開平６−３２０３５７号 In the screw tightening process, it is necessary to determine whether the work is performed according to the design, such as screw type, washer presence, diagonal tightening, etc. There is also. For example, in the automatic screw tightening machine disclosed in Patent Document 1, a torque sensor and an encoder are provided to detect a tightening torque and a rotation angle of a driver spindle and a driver bit, thereby determining whether the screw is good or bad. As the determination means, a control unit, a storage means, an input / output interface, and the like are usually configured by a microcomputer, a sequence, and the like, so that various screw tightening operations can be handled.
JP-A-6-320357

動力式ねじ締め機に種々のセンサを組み込むことによって、多様な機能を付与させることができるものの、装置が大型化することやコスト高、操作性の低下に繋がる。特に、製造ラインに設置する自動ねじ締め機と異なって手持ち式ドライバツールにおいては、上記問題が大きく影響する。   Although various functions can be provided by incorporating various sensors into the power screw tightening machine, the apparatus becomes larger, the cost is increased, and the operability is lowered. In particular, the above-mentioned problem is greatly affected in a hand-held driver tool unlike an automatic screw tightener installed in a production line.

このため、手持ち式のドライバツールにおいては、ねじの取付不良の割合と、大型化やセンサに接続するコード類による作業性の低下を考慮する必要があり、ワークの種類によっても左右される。また、熟練の作業者であれば、操作性の高いトルクドライバを使用して不良品を出すことなく作業能率を向上させることができる場合でも、一般の作業者では歩留まりが低下するなど、作業者の資質にも左右される。
For this reason, in a hand-held driver tool, it is necessary to consider the ratio of defective mounting of screws and the reduction in workability due to the increase in size and the cords connected to the sensor, which also depends on the type of workpiece. Moreover, even if the skilled worker can improve the work efficiency without using a torque driver with high operability without producing a defective product, the yield of the ordinary worker is reduced. It depends on the quality of

そこで本発明者は上記課題に鑑み鋭意研究した結果、本発明を成し得たものであり、その特徴とするところは、トルク設定装置を備えた動力式ねじ締め機において、ドライバビットのクランプ部分に被せて取り付ける検出装置であって、本体ケース基部側にねじ締め機への取付部、先端部側に回転ディスクとその回転を検出するセンサを設けたセンサ基板とによって構成したロータリーエンコーダを備えた構造であり、該センサ基板は該本体ケースに固定し該ドライバビットを遊嵌させる貫通孔を備え、該回転ディスクは該本体ケースに軸受けを介して回転可能に支持すると共に該ドライバビットの多角形軸部に係合するビット挿通孔を設けることにより、該本体ケースの軸心方向に相互に対向させて配したことにある。   Therefore, as a result of diligent research in view of the above problems, the present inventor has achieved the present invention. The feature of the present inventor is that in a power screw tightening machine equipped with a torque setting device, a clamp portion of a driver bit And a rotary encoder constituted by a mounting part to a screw tightener on the base case base side and a sensor board provided with a rotating disk and a sensor for detecting the rotation on the tip side. The sensor board has a through hole that is fixed to the main body case and loosely fits the driver bit, and the rotating disk is rotatably supported by the main body case via a bearing, and the polygon of the driver bit is formed. By providing a bit insertion hole that engages with the shaft portion, the body case is arranged so as to face each other in the axial direction.

本明細書中でいう「動力式ねじ締め機」とは、電動モータやエアモータによりドライバビットを回転駆動するもので、ねじ、ボルト、ナット等を締め付ける装置をいう。本発明においては、トルク設定装置を備えた動力式ねじ締め機に、ロータリーエンコーダをアタッチメントとして取り付けることにより、締め付けトルク及び回転角でねじ締め作業の良否を判定する構造とする。トルク設定装置としては、空転形のシグナル式が工場などで多く使用されているが、ダイヤル形やデジタル形の直読式などでもよく特に限定するものではない。   The term “powered screw tightening machine” as used in the present specification refers to a device that rotates a driver bit with an electric motor or an air motor and tightens screws, bolts, nuts, and the like. In this invention, it is set as the structure which judges the quality of the screw fastening operation | work by a fastening torque and a rotation angle by attaching a rotary encoder as an attachment to the power type screw fastening machine provided with the torque setting apparatus. As the torque setting device, an idling type signal type is often used in factories and the like, but a dial type or a digital type direct reading type may be used and is not particularly limited.

「本体ケース」とは、先端部側にロータリーエンコーダを設けることにより、動力式ねじ締め機で回転駆動するドライバビットの回転角を検出する部材をいう。このため、本体ケースは基部側にねじ締め機への取付部を設け、ドライバビットのクランプ部に被せるようにして取り付ける。取付部としては、ねじ締め機に設けられているねじ部に螺合させる構造の他、ビス等でねじ締め機に取り付けたり締め付けるようにしてもよい。   The “main body case” refers to a member that detects a rotation angle of a driver bit that is rotationally driven by a power screw tightening machine by providing a rotary encoder on the tip side. For this reason, the main body case is provided with an attachment portion to the screw tightener on the base side so as to cover the clamp portion of the driver bit. As an attachment part, you may make it attach or tighten to a screwing machine with a screw | thread etc. other than the structure screwed in the screw part provided in the screwing machine.

本体ケースに設けるロータリーエンコーダとしては、磁気式や光電式などで検出する回転角センサである。本発明では、磁石を配した磁気ディスクやスリット板などの回転ディスクを軸受を介して回転可能に、センサを備えたセンサ基板を固定して、本体ケースの軸方向に対向させて配している。軸受としては、金属やプラスチック製の玉軸受やすべり軸受などである。   The rotary encoder provided in the main body case is a rotation angle sensor that detects magnetic or photoelectric. In the present invention, a rotating disk such as a magnetic disk provided with a magnet or a slit plate can be rotated via a bearing so that a sensor substrate provided with a sensor is fixed and is opposed to the axial direction of the main body case. . Examples of bearings include ball bearings and plain bearings made of metal or plastic.

「ビット挿通孔」とは、回転ディスクに設けたもので、ドライバビットを挿通させると共に、該ドライバビットの多角形軸部に係合させる多角形の貫通孔である。これにより、ドライバビットの回転を利用して回転ディスクを回転させることができ、ドライバビットの交換も可能となる。また、回転ディスクと軸方向に対向させて配したセンサ基板には、貫通孔を設けることにより、ドライバビットと干渉しないようにしている。
The “bit insertion hole” is a polygonal through hole that is provided in the rotating disk and allows the driver bit to be inserted and engaged with the polygon shaft portion of the driver bit. As a result, the rotating disk can be rotated using the rotation of the driver bit, and the driver bit can be exchanged. In addition, the sensor substrate disposed so as to face the rotating disk in the axial direction is provided with a through hole so as not to interfere with the driver bit.

本発明に係るネジ締め不良検出装置は、ねじ締め機に取り付ける本体ケースに回転ディスクとセンサ基板を軸方向に対向させて設けたことにより、これらの位置関係の保持が確実となる。このため、ねじ締め機に外付けするアタッチメント構造の検出装置において、取り付け時における設定を要することなく回転数検出を確実にすることができ、取り付け取り外しも容易となる。   In the screw tightening failure detecting device according to the present invention, the rotating disk and the sensor substrate are provided in the body case attached to the screw tightening machine so as to face each other in the axial direction. For this reason, in the detection device having an attachment structure that is externally attached to the screw tightening machine, it is possible to reliably detect the number of rotations without requiring setting at the time of attachment, and attachment and removal are facilitated.

また、回転ディスクにドライバビットに係合させるビット挿通孔、回路部に該ドライバビットを遊嵌させる貫通孔を設けたことにより、既存のドライバビットをそのまま使用することができ、しかも容易に交換することができる。さらに、本体ケースには回転ディスクと回路部を軸方向に対向させて設けているので、全体を細くすることができ、検出装置を取り付けたことによる視認性の影響を少なくできるなど極めて有益な効果を有するものである。
Also, by providing a bit insertion hole for engaging the driver bit in the rotating disk and a through hole for loosely fitting the driver bit in the circuit portion, the existing driver bit can be used as it is and can be easily replaced. be able to. In addition, since the main body case is provided with the rotating disk and the circuit portion facing each other in the axial direction, the entire case can be made thin, and the effect of visibility due to the attachment of the detection device can be reduced, which is extremely beneficial. It is what has.

本発明に係るネジ締め不良検出装置は、ねじ締め機に取り付ける本体ケースに、ドライバビットを挿通可能とした回転ディスク及び回路部を設けると共に、これらを軸方向に対向させて設けることで上記課題を解決した。
The screw tightening failure detection device according to the present invention is provided with a rotating disk and a circuit portion through which a driver bit can be inserted in a main body case attached to a screw tightening machine, and these are provided so as to face each other in the axial direction. Settled.

図１は、本発明に係るネジ締め不良検出装置１の一実施例を示すもので、トルク設定装置を備えたねじ締め機Ｄに取り付けることにより、ねじ締め作業における回転角度を検出してねじ取り付け不良を識別する機能を付与する。ネジ締め不良検出装置１は、ねじ締め機Ｄに取り付ける取付部としてのねじ部２１を基部側に設けた本体ケース２に、ロータリーエンコーダＥを内蔵した構造である。従って、ねじ締め機Ｄとしては既存のものを何ら改造することなくそのまま利用することが可能となる。このため、ネジ締め不良検出装置１の取り付け取り外しも容易であり、ワークの種類によって任意に対応することができる。   FIG. 1 shows an embodiment of a screw tightening failure detection device 1 according to the present invention, which is attached to a screw tightening machine D equipped with a torque setting device, thereby detecting a rotation angle in screw tightening work and screw mounting. A function for identifying defects is added. The screw tightening failure detection device 1 has a structure in which a rotary encoder E is built in a main body case 2 provided with a screw portion 21 as a mounting portion to be attached to a screw tightening machine D on the base side. Accordingly, the existing screw tightening machine D can be used as it is without any modification. For this reason, attachment and detachment of the screw tightening failure detecting device 1 is easy, and can be arbitrarily coped with depending on the type of workpiece.

本例のネジ締め不良検出装置１は、本体ケース２に開口部２２を設けている。この開口部２２はドライバビットＤ１を取り付けるねじ締め機ＤのクランプＤ２操作用の窓であり、ねじ締め機Ｄに取り付けた状態でドライバビットＤ１を交換できるようにしている。ドライバビットＤ１の交換を可能にするため、本発明においてはロータリーエンコーダＥに該ドライバビットＤ１の貫通孔を設けている。回転ディスクＥ１には該ドライバビットＤ１の六角形状の軸部と係合する六角形のビット挿通孔Ｅ２を設け、該ドライバビットＤ１と共に回転させて、その回転角度を検出する構造としている。   In the screw tightening failure detection device 1 of this example, an opening 22 is provided in the main body case 2. The opening 22 is a window for operating the clamp D2 of the screw tightening machine D to which the driver bit D1 is attached, and the driver bit D1 can be exchanged in a state of being attached to the screw tightening machine D. In order to make it possible to replace the driver bit D1, in the present invention, the rotary encoder E is provided with a through hole for the driver bit D1. The rotating disk E1 is provided with a hexagonal bit insertion hole E2 that engages with the hexagonal shaft portion of the driver bit D1, and is rotated together with the driver bit D1 to detect the rotation angle.

ロータリーエンコーダＥは、図２に示すように回転ディスクＥ１を軸受３（ボールベアリング）を介して本体ケース２に可回転に支持すると共に、該回転ディスクＥ１の回転を検知するセンサＥ３を設けたセンサ基板Ｅ４を本体ケース２に固定している。本体ケース２に回転ディスクＥ１及びセンサ基板Ｅ４を組み込んだことにより、取り付け時におけるギャップ等の設定も必要なく、安定した検出が可能となる。   As shown in FIG. 2, the rotary encoder E supports the rotating disk E1 in a rotatable manner on the main body case 2 via a bearing 3 (ball bearing), and includes a sensor E3 that detects the rotation of the rotating disk E1. The substrate E4 is fixed to the main body case 2. By incorporating the rotating disk E1 and the sensor substrate E4 into the main body case 2, there is no need to set a gap or the like at the time of attachment, and stable detection is possible.

本例のネジ締め不良検出装置１においては、本体ケース２を構成する本体キャップ２３に回転ディスクＥ１を組み込んでいる。これは、図３に示すように本体キャップ２３に軸受３を介して回転部材２４を設け、該回転部材２４にリング状に整列させた磁石Ｅ５を設けた構造であり、該回転部材２４に六角形のビット挿通孔Ｅ２を設けている。また、センサ基板Ｅ４は基板取付板４に取り付け、該基板取付板４を本体ケース２に固定している。
In the screw tightening failure detection device 1 of this example, the rotating disk E1 is incorporated in the main body cap 23 constituting the main body case 2. This is a structure in which a rotating member 24 is provided on the main body cap 23 via the bearing 3 as shown in FIG. 3, and a magnet E5 aligned in a ring shape is provided on the rotating member 24. A square bit insertion hole E2 is provided. Further, the sensor substrate E4 is attached to the substrate attachment plate 4, and the substrate attachment plate 4 is fixed to the main body case 2.

図４は、本発明に係るネジ締め不良検出装置１の他の実施例であり、本体ケース２を先細り状に形成することで、作業時における視認性を高めている。本例では、本体キャップ２３を台錘状に形成して先細り状としている。この本体キャップ２３に回転ディスクＥ１を組み込むため、ビット挿通孔Ｅ２を有し磁石Ｅ５を設けた回転部材２４を、プラスチックすべり軸受３を軸方向に介することによって取り付け、全体の大きさをコンパクトにしている。
FIG. 4 shows another embodiment of the screw tightening failure detection apparatus 1 according to the present invention, and the main body case 2 is formed in a tapered shape to improve the visibility during work. In this example, the main body cap 23 is formed in a trapezoidal shape and is tapered. In order to incorporate the rotating disk E1 into the main body cap 23, the rotating member 24 having the bit insertion hole E2 and the magnet E5 is attached by inserting the plastic sliding bearing 3 in the axial direction, thereby reducing the overall size. Yes.

本発明に係るネジ締め不良検出装置の一実施例を示す斜視図である。（実施例１）It is a perspective view which shows one Example of the screwing defect detection apparatus which concerns on this invention. (Example 1) 図１に示したネジ締め不良検出装置の断面図である。It is sectional drawing of the screw fastening defect detection apparatus shown in FIG. 図１に示したネジ締め不良検出装置の分解図である。FIG. 2 is an exploded view of the screw tightening failure detecting device shown in FIG. 1. 本発明に係るネジ締め不良検出装置の他の実施例を示す断面図である。（実施例２）It is sectional drawing which shows the other Example of the screwing defect detection apparatus which concerns on this invention. (Example 2)

符号の説明Explanation of symbols

１ ネジ締め不良検出装置
２ 本体ケース
２１ ねじ部
２２ 開口部
２３ 本体キャップ
２４ 回転部材
３ 軸受
４ 基板取付板
Ｄ ねじ締め機
Ｄ１ ドライバビット
Ｅ ロータリーエンコーダ
Ｅ１ 回転ディスク
Ｅ２ ビット挿通孔
Ｅ３ センサ
Ｅ４ センサ基板
Ｅ５ 磁石 DESCRIPTION OF SYMBOLS 1 Screw fastening defect detection apparatus 2 Main body case 21 Screw part 22 Opening part 23 Main body cap 24 Rotating member 3 Bearing 4 Board mounting plate D Screw fastening machine D1 Driver bit E Rotary encoder E1 Rotating disk E2 Bit insertion hole E3 Sensor E4 Sensor board E5 magnet

Claims (4)

トルク設定装置を備えた動力式ねじ締め機において、ドライバビットのクランプ部分に被せて取り付ける検出装置であって、本体ケース基部側にねじ締め機への取付部、先端部側に回転ディスクとその回転を検出するセンサを設けたセンサ基板とによって構成したロータリーエンコーダを備えた構造であり、該本体ケースに固定し該ドライバビットを遊嵌させる貫通孔を備えた該センサ基板と、該本体ケースに軸受けを介して回転可能に支持すると共に該ドライバビットの多角形軸部に係合するビット挿通孔を設けた該回転ディスクは、該本体ケースの軸心方向に相互に対向させて配したことを特徴とするネジ締め不良検出装置。 In a power type screw tightening machine equipped with a torque setting device, it is a detection device that is mounted on a clamp part of a driver bit, the mounting part to the screw tightening machine on the main body case base side, and the rotating disk and its rotation on the tip side a structure provided with a rotary encoder configured by a sensor substrate provided with a sensor for detecting a, and the sensor substrate having a through hole for loosely fitted the driver bit fixed to the body casing, a bearing to the body case The rotary disk that is rotatably supported via the screw shaft and provided with a bit insertion hole that engages with the polygonal shaft portion of the driver bit is arranged to face each other in the axial direction of the main body case. Screw tightening defect detection device. 本体ケースは、ドライバビットを着脱するクランプ操作用の開口部を設けた請求項１記載のネジ締め不良検出装置。 Body case, screw fastening failure detecting apparatus according to claim 1, wherein an opening is provided for the clamp operation of attaching and detaching the driver bit. 本体ケースは、先端側を先細りの台錘状に形成した請求項２記載のネジ締め不良検出装置。 3. The screw tightening failure detection device according to claim 2 , wherein the main body case is formed in a taper shape with a tapered front end. 本体ケースは、先端側に本体キャップを設けた構造であり、該本体キャップに回転ディスクを軸受を介して設けた請求項３記載のネジ締め不良検出装置。 4. The screw tightening failure detection device according to claim 3 , wherein the main body case has a structure in which a main body cap is provided on a distal end side, and a rotating disk is provided on the main body cap via a bearing.
JP2008051764A 2008-03-03 2008-03-03 Screw tightening detection device Expired - Fee Related JP4808741B2 (en)

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DE19857563A1 (en) * 1998-12-14 2000-06-15 Hilti Ag Hand-held screwdriver
JP4392305B2 (en) * 2004-08-20 2009-12-24 日東精工株式会社 Part fastening driver unit

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