JP2016185581A5

JP2016185581A5 -

Info

Publication number: JP2016185581A5
Application number: JP2015066621A
Authority: JP
Filing date: 2015-03-27
Publication date: 2017-11-02
Anticipated expiration: 2035-03-27

Description

操作表示部２４には、図１に示すように、ＬＥＤ表示部４０、７セグメント表示部４２、及び各種操作ボタン４４等が配置されている。ＬＥＤ表示部４０は、当該電動ドライバ１の動作状態をその色で表示する。７セグメント表示部４２は、設定時には設定パラメータを表示し、何らかのエラーが発生したときにはそのエラーに対応する番号等を表示する。各種操作ボタン４４により、当該電動ドライバ本体１０の設定を変更したり、当該電動ドライバ本体１０を、後述する、通常駆動モード、仮締めモード、赤外線通信モード、本体設定モード、及びネジ締め時間計測モードの間で切り替えたりすることができる。 As shown in FIG. 1, the operation display unit 24 includes an LED display unit 40, a 7-segment display unit 42, various operation buttons 44, and the like. The LED display unit 40 displays the operation state of the electric driver 1 in the color. The 7-segment display unit 42 displays setting parameters at the time of setting, and displays a number corresponding to the error when an error occurs. Various operation buttons 44 are used to change the setting of the electric driver main body 10, or to change the electric driver main body 10 into a normal drive mode, a temporary tightening mode, an infrared communication mode, a main body setting mode, and a screw tightening time measurement mode, which will be described later. Or switch between them.

仮締めモードにおけるトルク制御モードにおいては、図３に示すように、トリガレバー２０がＯＮにされると（Ｓ１０）、制御部３０によって駆動モータ３２の正転方向での駆動が開始されてビットホルダ１８が正転を開始する（Ｓ１２）。ビットホルダ１８の正転中にトリガレバー２０がＯＦＦにされると（Ｓ１４）、駆動モータ３２は徐々に停止される（Ｓ１６）。ネジが着座するとビットホルダ１８には負荷トルクがかかるが、この負荷トルクが所定の締め付けトルク以上となりクラッチ機構が解除されるとともにクラッチセンサ３４によってクラッチ機構の解除が検知されたときに、制御部はビットホルダ１８が第１回転量だけ回転したものとする（Ｓ１８）。クラッチ機構が解除されると、制御部３０は駆動モータ３２の駆動を一定時間、例えば０．５秒間停止する（Ｓ２０）。一定時間の停止が終わると、駆動モータ３２の逆転方向での駆動が開始されて、ビットホルダ１８が自動的に逆転を始める（Ｓ２２）。制御部３０は、逆転開始から所定時間経過した時点でビットホルダ１８が第２回転量だけ回転したものと判断する（Ｓ２８）。所定の逆転駆動時間が経過する前に、例えば、ネジが噛み込み状態にあったために逆転されずビットホルダ１８に所定値以上の負荷トルクが加わりクラッチ機構が解除されてクラッチセンサ３４がこれを検知すると（Ｓ２４）、エラー信号を発して駆動モータ３２が停止される（Ｓ２６）。逆転を開始してから所定の逆転駆動時間が経過すると（Ｓ２８）、駆動モータ３２が停止されてそれに伴いビットホルダ１８の回転駆動も停止される（Ｓ３０）。これにより、ネジはその頭が被締結部材から所定量だけ浮いている仮締め状態となる。このようにして、一旦ネジを締付けてから所定量(第２回転量)だけ戻すようにしているため、ネジの長さのばらつきや、ネジの初期配置状態（ネジの先端を雌ネジに係合させてネジ締めが行われる前の状態）のばらつきに影響を受けることなく、複数のネジの頭をほぼ均等な量だけ浮かせた状態とすることができる。正常にネジの仮締めが完了すると、カウンタ部３６が仮締めしたネジの本数を更新する（Ｓ３２）。この実施例では、逆転開始からの所定時間の経過をもって第２回転量だけ逆転がされたものとしているが、第２回転量としての所定回転数をあらかじめ設定しておき、この所定回転数をカウントして第２回転量だけ逆転したものとすることもできる。
In the torque control mode in the temporary tightening mode, as shown in FIG. 3, when the trigger lever 20 is turned on (S10), the control unit 30 starts to drive the drive motor 32 in the normal rotation direction, and the bit holder 18 starts normal rotation (S12). When the trigger lever 20 is turned OFF during the forward rotation of the bit holder 18 (S14), the drive motor 32 is gradually stopped (S16). When the screw is seated, a load torque is applied to the bit holder 18, but when the load torque exceeds a predetermined tightening torque and the clutch mechanism is released and the clutch sensor 34 detects the release of the clutch mechanism, the control unit It is assumed that the bit holder 18 is rotated by the first rotation amount (S18). When the clutch mechanism is released, the control unit 30 stops driving the drive motor 32 for a predetermined time, for example, 0.5 seconds (S20). When stopping for a certain period of time, the drive motor 32 starts to be driven in the reverse direction, and the bit holder 18 automatically starts reverse rotation (S22). The control unit 30 determines that the bit holder 18 has been rotated by the second rotation amount when a predetermined time has elapsed since the start of reverse rotation (S28). Before the predetermined reverse rotation drive time elapses, for example, the screw is in the engaged state and the reverse rotation is not performed, so that a load torque exceeding a predetermined value is applied to the bit holder 18 and the clutch mechanism is released, and the clutch sensor 34 detects this. Then (S24), an error signal is issued and the drive motor 32 is stopped (S26). When a predetermined reverse drive time has elapsed since the start of reverse rotation (S28), the drive motor 32 is stopped, and accordingly, the rotational drive of the bit holder 18 is also stopped (S30). As a result, the screw is in a temporarily tightened state in which the head of the screw is lifted from the member to be fastened by a predetermined amount. In this way, since the screw is once tightened and then returned by a predetermined amount (second rotation amount), the variation in the screw length and the initial arrangement state of the screw (the screw tip is engaged with the female screw) Thus, the heads of the plurality of screws can be lifted by a substantially equal amount without being affected by variations in the state before the screws are tightened. When the temporary tightening of the screws is completed normally, the counter unit 36 updates the number of screws temporarily tightened (S32). In this embodiment, it is assumed that the reverse rotation is performed by the second rotation amount after the elapse of a predetermined time from the start of the reverse rotation. However, the predetermined rotation number as the second rotation amount is set in advance and the predetermined rotation number is counted. Thus, the rotation amount can be reversed by the second rotation amount.

Claims

A screwing member fastening tool having a function of temporarily fastening a screwing member,
A drive unit that rotationally drives a screwing member engaging portion that engages with the screwing member;
A control unit for controlling the driving of the driving unit,
The control unit controls the drive unit to cause the screwing member engaging unit to rotate forward by the first rotation amount and then automatically reverse the rotation by a second rotation amount smaller than the first rotation amount. A screwing member tightening tool.

The controller controls the amount of rotation of the screwing member engaging portion by controlling the driving time of the driving portion, and the screwing is performed by driving the driving portion to rotate forward for a first time. The member engaging portion is rotated forward by the first amount of rotation, and the screwing member engaging portion is rotated reversely by the second amount of rotation by driving the driving portion to rotate reversely for a second time. The screwing member tightening tool according to claim 1, wherein the first time is set so that the first rotation amount is an amount in which the screwing member does not sit on the fastened member.

Torque detecting means for detecting that a load torque of a predetermined value or more is applied to the screwing member engaging portion;
When a load torque greater than the predetermined value is detected by the torque detecting means while the drive unit is controlled to rotate the screwing member engaging portion forward by the first rotation amount, The screwing member tightening tool according to claim 2, wherein the control unit stops the driving unit.

The first rotation amount is an amount of rotation until the screwing member is seated on the fastened member and further tightened by a predetermined tightening torque.
The control unit rotates the screwing member engaging part by the first rotation amount so that the screwing member is seated on the fastened member, and a predetermined tightening torque is applied to the seated screwing member. 2. The screwing member tightening tool according to claim 1, wherein the screwing member engaging portion is automatically reversed by the second rotation amount after the first time.

A clutch mechanism for drivingly connecting the driving portion and the screwing member engaging portion, wherein the driving portion and the screw are engaged when a torque greater than the predetermined tightening torque is applied to the screwing member engaging portion. A clutch mechanism configured to release the drive connection with the joint member engaging portion;
A clutch sensor for detecting that the drive connection by the clutch mechanism is released;
Further comprising
5. The control unit according to claim 4, wherein the control unit determines that the screwing member engaging unit has rotated forward by the first rotation amount when the clutch sensor detects the release of the drive connection. 6. Screwing member tightening tool.

6. The control unit according to claim 5, wherein the control unit determines that the screwing member engaging unit has been rotated by the second rotation amount after a lapse of a predetermined time from the start of the reverse rotation. Screwing member tightening tool.

The control unit
The amount of rotation of the screwing member engaging portion is controlled by controlling the driving time of the driving portion, and the screwing member engaging portion is moved forward by driving the driving portion for the first time. A time control mode in which the screw member engaging portion is reversely rotated by the second rotation amount by causing the first rotation amount to rotate forward and the drive unit to be reversely driven by a second time period. A time control mode in which the first time is set such that the amount is such that the screwing member does not sit on the fastened member;
The first rotation amount is defined as an amount of rotation until the screwing member is seated on the fastened member and further tightened by a predetermined tightening torque, and the screwing member engaging portion is rotated by the first rotation amount. By causing the screwed member to be seated on the fastened member and applying a predetermined tightening torque to the seated screwed member, the screwed member engaging portion is automatically moved by the second rotation amount. Torque control mode to reverse
The screwing member fastening tool according to claim 1, wherein the screwing member fastening tool is selectable.

A counter unit that counts that normal temporary tightening is performed once when the screwing member engaging portion is rotated forward by the first rotation amount and then automatically reversed by the second rotation amount; The screwing member tightening tool according to any one of claims 1 to 7, further comprising:

The screwing member tightening tool according to any one of claims 1 to 8 , further comprising a remote setting device that wirelessly communicates with the control unit to change the setting values of the first and second rotation amounts.