JP4089583B2 - Compressed air screwing machine - Google Patents

Compressed air screwing machine Download PDF

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JP4089583B2
JP4089583B2 JP2003343293A JP2003343293A JP4089583B2 JP 4089583 B2 JP4089583 B2 JP 4089583B2 JP 2003343293 A JP2003343293 A JP 2003343293A JP 2003343293 A JP2003343293 A JP 2003343293A JP 4089583 B2 JP4089583 B2 JP 4089583B2
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piston
compressed air
air
hole
cylinder
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JP2005103727A (en
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健 加茂
康雄 佐々木
道男 若林
治彦 大内
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Koki Holdings Co Ltd
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Hitachi Koki Co Ltd
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Description

本発明はピストンによる推進力とモータによる回転によりねじを被締結材にねじ込む圧縮空気ねじ締め機に関するものである。   The present invention relates to a compressed air screwing machine for screwing a screw into a material to be fastened by a propulsive force by a piston and rotation by a motor.

エアモータ及びピストンにより回転及び軸方向の運動を与えられるドライバビットによってねじをねじ込み、戻し空気室に蓄えた圧縮空気によりピストン及びドライバビットを初期状態に戻す機構を有する圧縮空気ねじ締め機は、例えば特許文献1等で周知の構成である。これは、ピストンが下死点付近に到達し始めてから戻し空気室に圧縮空気を蓄え、ピストンが直接ピストンバンパに当接してねじ締めを完了後、ピストン下部に戻し空気室の圧縮空気を供給してピストン及びドライバビットを初期状態に戻す。   A compressed air screwing machine having a mechanism in which a screw is screwed by a driver bit which is given rotational and axial movement by an air motor and a piston, and a piston and a driver bit are returned to an initial state by compressed air stored in a return air chamber is, for example, a patent This is a well-known configuration in Document 1, etc. This is because the compressed air is stored in the return air chamber after the piston starts to reach the vicinity of the bottom dead center, and after the piston is in direct contact with the piston bumper and screw tightening is completed, the compressed air in the return air chamber is supplied to the lower part of the piston. Return the piston and driver bit to the initial state.

特開平１１−２３５６２８号公報JP-A-11-235628

上記した周知構成の圧縮空気ねじ締め機では、ねじ締め終了直前のピストンが下死点付近に到達した時点から戻し空気室に空気を蓄え始めるので、ねじ締め終了後、戻し空気室に圧縮空気が所定量溜まる前に操作弁を戻したり、カムアウト等でねじ締めが不完全でピストンが下死点まで到達していない場合、ピストン及びドライバビットが戻りきらないという不具合が発生する。また、ピストンの戻りを良くするためにピストンが下死点付近に到達するよりも前に戻し空気室に圧縮空気を供給し始めると、戻し空気室の圧縮空気がピストンの下部に流入するため、ピストン下降の抵抗となりピストンの推力が小さくなりカムアウトが発生しやすくなる等の問題があった。   In the compressed air screw tightening machine having the well-known configuration described above, air starts to be stored in the return air chamber from the time when the piston just before the end of screw tightening reaches near the bottom dead center. If the operating valve is returned before the predetermined amount is accumulated, or if the screw is not completely tightened due to a cam-out or the like and the piston has not reached the bottom dead center, the piston and the driver bit may not return completely. In addition, if the compressed air in the return air chamber flows into the lower part of the piston when the compressed air starts to be supplied to the return air chamber before the piston reaches near the bottom dead center in order to improve the return of the piston, There was a problem that the piston descended and the thrust of the piston became small, so that a cam-out was likely to occur.

この欠点を解消するため、ピストンを、主ピストン及び主ピストンを貫通して上下動する副ピストンにより構成し、主ピストンがピストンバンパに当接する下死点到達後に戻し空気室に圧縮空気を供給可能とすると共に副ピストンと戻し空気室間を遮断して副ピストンの推力が小さくなるのを防止する構成を特願２００３−３２８２２８により提案した。   To eliminate this drawback, the piston is composed of a main piston and a secondary piston that moves up and down through the main piston, and the compressed air can be supplied to the return air chamber after reaching the bottom dead center where the main piston contacts the piston bumper. In addition, Japanese Patent Application No. 2003-328228 has proposed a configuration in which the auxiliary piston and the return air chamber are blocked to prevent the thrust of the auxiliary piston from becoming small.

しかしかかる構成にすると、副ピストンのピストン部は、ドライバビットとドライバビットを案内するドライバビット孔との僅かなクリアランスを介して大気に連通するので、副ピストンの下降時にピストン部とピストンバンパ間の空間が圧縮され、副ピストンの推力が小さくなるという新たな問題が発生することが分かった。 However, with such a configuration, the piston portion of the secondary piston communicates with the atmosphere through a slight clearance between the driver bit and the driver bit hole that guides the driver bit. It has been found that a new problem arises that the space is compressed and the thrust of the secondary piston is reduced.

上記課題を解決するためになされた請求項１記載の圧縮空気ねじ締め機は、ピストンを、シリンダ内を摺動する如く設けられ、長手方向中間位置に内外を連通する第１連通穴を有する円筒状の主ピストンと、主ピストン内を摺動する如く設けられ、回転体内に開口する空気供給穴、長手方向中間位置に空気供給穴と主ピストンの中空部とを連通する第２連通穴、第２連通穴の下方にピストン部を設け、ピストン部の下方にドライバビット装着部とつば部を有する副ピストンによって構成し、ねじ締め終了時に前記つば部が前記ピストンバンパに当接するようにしたことを特徴としている。The compressed air screw tightening machine according to claim 1, wherein the piston is provided so as to slide in the cylinder, and has a first communication hole that communicates the inside and the outside at an intermediate position in the longitudinal direction. A main piston that is shaped to slide, an air supply hole that opens within the main piston, and a second communication hole that communicates the air supply hole and the hollow portion of the main piston at the middle position in the longitudinal direction. 2 Piston part is provided below the communication hole, and it is constituted by a sub piston having a driver bit mounting part and a collar part below the piston part, and the collar part is in contact with the piston bumper at the end of screw tightening. It is a feature.

かかる構成の圧縮機ねじ締め機によれば、主ピストンがピストンバンパに当接する下死点到達時に副ピストンのピストン部底面とピストンバンパとの距離が十分取れるようになり、副ピストンが下降したとしても副ピストンのピストン部下方の空気が圧縮される量が小さくなり圧力があまり高くならないので、副ピストンの推力が小さくなることはなくなる。   According to the compressor screw tightening machine having such a configuration, when the bottom piston reaches the bottom dead center where the main piston comes into contact with the piston bumper, a sufficient distance can be obtained between the bottom surface of the piston portion of the sub piston and the piston bumper. However, since the amount of compressed air below the piston portion of the sub-piston is reduced and the pressure is not so high, the thrust of the sub-piston is not reduced.

請求項２記載の圧縮空気ねじ締め機は、請求項１記載の特徴に加えて、副ピストンのピストン部とつば部間に小空間を形成し、副ピストンの推力が小さくならないようにしたことを特徴としている。 Compressed air screw driver according to claim 2 is that in addition to the features of claim 1, wherein, the small spaces formed between the piston portion and the flange portion of the secondary piston, the thrust of the secondary piston is not be less It is characterized by.

請求項３記載の圧縮空気ねじ締め機は、請求項１記載の特徴に加えて、円形のつば部は容易に形成でき、結果としてねじ締め機の製作が容易になる。   In the compressed air screwing machine according to claim 3, in addition to the feature according to claim 1, the circular collar can be easily formed, and as a result, the screwing machine can be easily manufactured.

請求項１記載の発明によれば、主ピストンの下死点到達時に副ピストンのピストン部とピストンバンパとの距離を十分取るように形成したので、副ピストンが下降してもピストン部とピストンバンパ間の空間の圧力が高くなることはなく、副ピストンの推力が小さくなる恐れはなくなる。すなわちねじを確実に締めることが可能となる。またねじ締め終了時につば部がピストンバンパに当接するようにしたので、副ピストンの上部を構成する部品に無理な力が加わることがなくなり、部品が破損する恐れがなくなる。 According to the first aspect of the present invention, when the bottom dead center of the main piston is reached, the distance between the piston portion of the sub piston and the piston bumper is sufficiently large. The pressure in the space in between does not increase, and there is no possibility that the thrust of the sub piston will be reduced. That is, the screw can be securely tightened. Since the flange portion is adapted to abut against the piston bumper at screwing ends, prevents the excessive force to the component which constitutes the top of the slave piston is applied, parts there is no possibility of breakage.

請求項２記載の発明によれば、ピストン部とつば部間に小空間を形成するようにしたので、ピストン部とピストンバンパ間の空間の圧力が高くなるのを確実に防止できるようになる。   According to the invention described in claim 2, since the small space is formed between the piston portion and the collar portion, it is possible to reliably prevent the pressure in the space between the piston portion and the piston bumper from increasing.

請求項３記載の発明よれば、円形のつば部が容易に形成でき、結果としてねじ締め機の製作が容易になる。   According to the third aspect of the present invention, the circular collar portion can be easily formed, and as a result, the screwing machine can be easily manufactured.

カムアウトの発生を防止するという目的を、ピストンを主ピストン及び副ピストンにより構成すると共に主ピストン及び副ピストンの構成を工夫することにより実現した。   The purpose of preventing the occurrence of a cam-out was realized by constructing the piston with a main piston and a sub piston and devising the configuration of the main piston and the sub piston.

本体１の外枠を形成するボディ５内には、圧縮空気取入口３５に連通した蓄圧室４、トリガレバー３３により開閉される操作弁３０、操作弁３０により開閉される主弁２８が設けられ、上方にあるエアモータ２、遊星歯車装置３を介して回転される有底円筒状の回転体６が回転可能に支持されている。回転体６の内壁には軸方向に延びた一対の凹部１０が設けられている。凹部１０に嵌挿する一対の凸部８を上方に有する回転スライド部材７が軸方向に移動可能な如く回転体６内に設けられている。回転スライド部材７にはエア遮断面１４が設けられている。   In the body 5 forming the outer frame of the main body 1, a pressure accumulating chamber 4 communicating with the compressed air intake 35, an operation valve 30 opened and closed by the trigger lever 33, and a main valve 28 opened and closed by the operation valve 30 are provided. A bottomed cylindrical rotating body 6 that is rotated via an air motor 2 and a planetary gear device 3 located above is rotatably supported. A pair of recesses 10 extending in the axial direction is provided on the inner wall of the rotating body 6. A rotary slide member 7 having a pair of convex portions 8 to be inserted into the concave portions 10 is provided in the rotary body 6 so as to be movable in the axial direction. The rotary slide member 7 is provided with an air blocking surface 14.

上端が回転スライド部材７に固着されたシャフト部材９の上端部と中央付近には後述するピストン部１３に圧縮空気を供給するための空気供給穴３８及び小径穴３７が設けられている。シャフト部材９の下端部には、ドライバビット１１を装着するドライバビット装着部４０、その上方外周部にピストン部１３、その下方にピストン部１３の外径より径の小さい円形状のつば部２５が設けられている。空気供給穴３８は回転スライド部材７上面に設けられた穴を介して回転体6内と連通している。小径穴３７はシャフト部材9外側の中空部２２と空気供給穴３８を連通するもので、本発明第２連通穴を構成する。またシャフト部材９は本発明副ピストンを構成する An air supply hole 38 and a small-diameter hole 37 for supplying compressed air to a piston portion 13 to be described later are provided in the vicinity of the upper end portion and the center of the shaft member 9 whose upper end is fixed to the rotary slide member 7. At the lower end portion of the shaft member 9, there is a driver bit mounting portion 40 for mounting the driver bit 11, a piston portion 13 at the upper outer peripheral portion thereof, and a circular collar portion 25 having a diameter smaller than the outer diameter of the piston portion 13 at the lower portion thereof. Is provided. The air supply hole 38 communicates with the inside of the rotating body 6 through a hole provided on the upper surface of the rotary slide member 7. The small-diameter hole 37 communicates the hollow portion 22 outside the shaft member 9 and the air supply hole 38, and constitutes the second communication hole of the present invention. The shaft member 9 constitutes the auxiliary piston of the present invention.

主ピストン２１は、回転スライド部材７の下方でシャフト部材９を内包し、シリンダ１２内に摺動可能に設けられている。主ピストン２１の中空部２２は上部がシャフト部材９の外径より大きく且つピストン部１３の外径より小さく、下部はピストン部１３が摺動可能な如く上部より大径に形成される。主ピストン２１の外周下端部と中央付近にはＯリング４５、４６が設けられており、Ｏリング４５、４６の間にはピストン部１３より上方の位置にピストン穴３９が設けられている。ピストン穴３９は主ピストン２１の内外を連通させるためのもので、本発明第１連通穴を構成する。   The main piston 21 includes the shaft member 9 below the rotary slide member 7 and is slidably provided in the cylinder 12. The hollow portion 22 of the main piston 21 has an upper portion larger than the outer diameter of the shaft member 9 and smaller than the outer diameter of the piston portion 13, and a lower portion having a larger diameter than the upper portion so that the piston portion 13 can slide. O-rings 45 and 46 are provided near the outer peripheral lower end and the center of the main piston 21, and a piston hole 39 is provided between the O-rings 45 and 46 at a position above the piston portion 13. The piston hole 39 is for communicating the inside and outside of the main piston 21 and constitutes the first communication hole of the present invention.

シリンダ１２の上部には、回転スライド部材７が所定距離降下した時に回転スライド部材７のエア遮断面１４と当接するプレート部１５が設けられ、プレート部１５の下方には通気孔１６が設けられている。通気孔１６は図示しないエア通路を介してエアモータ２の図示しない入気口に連通する。   A plate portion 15 that contacts the air blocking surface 14 of the rotary slide member 7 when the rotary slide member 7 is lowered by a predetermined distance is provided above the cylinder 12, and a vent hole 16 is provided below the plate portion 15. Yes. The air vent 16 communicates with an air inlet (not shown) of the air motor 2 via an air passage (not shown).

ボディ５の下方とシリンダ１２の外周の間には、空気釘打機等において周知構成の戻し空気室２０が形成されており、シリンダ１２下方には戻し空気室２０に圧縮空気を供給する圧縮空気流出穴２３が設けられている。その外周には逆止弁の働きをするゴムリング４７が装着されており、戻し空気室２０内の圧縮空気がシリンダ１２内へ流入するのを防止している。その下方には戻し空気室２０とシリンダ１２内を繋ぐ圧縮空気流入穴２４が複数個設けられている。シリンダ１２の下方には主ピストン２１及びシャフト部材９が下死点に到達した時に主ピストン２１の底面及びシャフト部材９のつば部２５が衝突するピストンバンパ３１が設けられている。   A return air chamber 20 having a well-known configuration is formed between the lower portion of the body 5 and the outer periphery of the cylinder 12, and the compressed air supplying compressed air to the return air chamber 20 is formed below the cylinder 12. An outflow hole 23 is provided. A rubber ring 47 that functions as a check valve is mounted on the outer periphery of the outer periphery of the cylinder 12 to prevent the compressed air in the return air chamber 20 from flowing into the cylinder 12. Below that, a plurality of compressed air inflow holes 24 connecting the return air chamber 20 and the inside of the cylinder 12 are provided. A piston bumper 31 is provided below the cylinder 12 so that the bottom surface of the main piston 21 and the flange portion 25 of the shaft member 9 collide when the main piston 21 and the shaft member 9 reach bottom dead center.

ボディ５の下方には、ねじ１８、ドライバビット１１をガイドする役割を有し、ドライバビット１１の径よりも僅かに大きな径を有するドライバビット通過孔５０を有する、釘打機において周知構成の、ノーズ部３６が設けられ、また図示しない連結バンドにより連結され、マガジン１７内に装填され連結されたねじ１８の先頭をノーズ部３６に自動供給するねじ送り部１９がノーズ部３６近傍に設けられている。ねじ送り部１９の下方には操作弁３０と連接したプッシュレバー２６が設けられている。   Below the body 5, the screw 18 and the driver bit 11 have a role to guide, and have a driver bit passage hole 50 having a diameter slightly larger than the diameter of the driver bit 11, which is a well-known configuration in a nailing machine. A nose portion 36 is provided, and a screw feed portion 19 is provided in the vicinity of the nose portion 36, which is connected by a connecting band (not shown) and automatically supplies the head of the screw 18 loaded and connected in the magazine 17 to the nose portion 36. Yes. A push lever 26 connected to the operation valve 30 is provided below the screw feeder 19.

以上のように構成された本発明ねじ締め機の動作について以下説明する。
本発明の圧縮空気ねじ締め機は、図1の状態から操作弁３０とプッシュレバー２６を共に操作して駆動を開始するものであるが、プッシュレバー２６を図示しない被締結材に押し当てた後操作弁３０を引いても、または操作弁３０を引きながらプッシュレバー２６を被締結材に押し当ててもねじ締めが可能である。 The operation of the screw tightening machine of the present invention configured as described above will be described below.
The compressed air screw tightening machine of the present invention starts driving by operating both the operation valve 30 and the push lever 26 from the state shown in FIG. 1, but after the push lever 26 is pressed against a material to be fastened (not shown). Even if the operation valve 30 is pulled or the push lever 26 is pressed against the material to be fastened while pulling the operation valve 30, the screw can be tightened.

圧縮空気取入口３５を図示しないコンプレッサに接続すると、圧縮空気は蓄圧室４、操作弁３０に流入する。プッシュレバー２６を被締結材に押し当てて操作弁３０を作動させると主弁２８が開き、圧縮空気は図示しないエア通路を介して回転体６内に流入し、主ピストン２１の上面に空気圧が加わる。また、シャフト部材９のピストン部１３の上面にも、空気供給穴３８及び小径穴３７を通過した圧縮空気及びピストン穴３９を通過した圧縮空気の空気圧が加わり、主ピストン２１、シャフト部材９は下方に押し下げられる。ピストン部１３すなわちシャフト部材９がねじ１８を連結バンドから外す抵抗により下降速度が減速されると、主ピストン２１はねじ１８先端が被締結材に打ち込まれる前にピストン部１３に追い付き、主ピストン２１とシャフト部材９は一体となって下降し、ドライバビット１１によりねじ１８を被締結材に打ち込む。なお、主ピストン２１のＯリング４６がシリンダ１２内を摺動するようになると、ピストン穴３９を通過してシャフト部材９のピストン部１３の上面に加わる圧縮空気はなくなる。   When the compressed air intake 35 is connected to a compressor (not shown), the compressed air flows into the pressure accumulating chamber 4 and the operation valve 30. When the operation valve 30 is operated by pressing the push lever 26 against the material to be fastened, the main valve 28 opens, compressed air flows into the rotating body 6 through an air passage (not shown), and air pressure is applied to the upper surface of the main piston 21. Join. Further, the air pressure of the compressed air that has passed through the air supply hole 38 and the small diameter hole 37 and the compressed air that has passed through the piston hole 39 is also applied to the upper surface of the piston portion 13 of the shaft member 9, and the main piston 21 and the shaft member 9 are moved downward. Pushed down. When the descending speed is reduced by the resistance of the piston portion 13, that is, the shaft member 9, that removes the screw 18 from the coupling band, the main piston 21 catches up with the piston portion 13 before the tip of the screw 18 is driven into the fastened material. The shaft member 9 is lowered integrally, and the screw 18 is driven into the material to be fastened by the driver bit 11. When the O-ring 46 of the main piston 21 slides in the cylinder 12, there is no compressed air that passes through the piston hole 39 and is applied to the upper surface of the piston portion 13 of the shaft member 9.

主ピストン２１が下死点に到達する直前、Ｏリング４５が圧縮空気流出穴２３を通過すると、空気供給穴３８、小径穴３７、ピストン穴３９を経由し圧縮空気流出穴２３より戻し空気室２０に圧縮空気が供給され始める。一方、回転体６内に供給された圧縮空気は通気口１６を介してエアモータ２に供給されてエアモータ２は回転する。エアモータ２の回転は遊星歯車装置３を介して回転体６及び回転スライド部材７に伝達されるので、図２に示すように主ピストン２１が下死点に到達した後は、ピストン部１３すなわちシャフト部材９だけの推力によりドライバビット１１は下降し、ねじ１８を被締結材にねじ込む。このとき、主ピストン２１の底面とピストンバンパ３１の当接により、戻し空気室２０の空気がピストン部１３下部に流入しないよう遮断されており、戻し空気室２０の圧縮空気がピストン部１３の下部に流入しない。この後ねじ１８が所定の深さまで締められると、回転スライド部材７のエア遮断面１４はプレート部１５に突き当たり下降を停止すると共に通気口１６が閉じられ、ほぼ同時につば部２５がピストンバンパ３１に当接しエアモータ２が停止してねじ締めが完了するのであるが、ピストン部１３の下部には充分な容積が残りピストン部１３の下部の空気はあまり圧縮されないのでピストン部１３の下降の抵抗とはならずカムアウトの発生は完全に防止される。上記した如く、回転スライド部材７のエア遮断面１４がプレート部１５に突き当たるとほぼ同時につば部２５がピストンバンパ３１に当接するようにしたので、回転スライド部材７特に回転スライド部材７とシャフト部材９を連結するピンに無理な力が加わることがなくなり、これらピン等が破損することはなくなる。
Immediately before the main piston 21 reaches bottom dead center, if the O-ring 45 passes through the compressed air outflow hole 23, the return air chamber 20 passes through the air supply hole 38, the small diameter hole 37, and the piston hole 39 from the compressed air outflow hole 23. Compressed air begins to be supplied. On the other hand, the compressed air supplied into the rotary body 6 is supplied to the air motor 2 via the vent opening 16 the air motor 2 rotates. Since the rotation of the air motor 2 is transmitted to the rotating body 6 and the rotating slide member 7 through the planetary gear device 3, as shown in FIG. 2, after the main piston 21 reaches the bottom dead center, the piston portion 13, that is, the shaft The driver bit 11 is lowered by the thrust of only the member 9, and the screw 18 is screwed into the material to be fastened. At this time, the contact between the bottom surface of the main piston 21 and the piston bumper 31 blocks the air in the return air chamber 20 from flowing into the lower portion of the piston portion 13, and the compressed air in the return air chamber 20 is in the lower portion of the piston portion 13. Does not flow into. Thereafter, when the screw 18 is tightened to a predetermined depth, the air blocking surface 14 of the rotary slide member 7 abuts against the plate portion 15 and stops descending, and the vent 16 is closed, and the collar portion 25 is moved to the piston bumper 31 almost simultaneously. The air motor 2 stops and the screw tightening is completed. However, a sufficient volume remains in the lower portion of the piston portion 13 and the air below the piston portion 13 is not compressed so much. In other words, the occurrence of come-out is completely prevented. As described above, since the flange portion 25 comes into contact with the piston bumper 31 almost simultaneously when the air blocking surface 14 of the rotary slide member 7 abuts against the plate portion 15, the rotary slide member 7, particularly the rotary slide member 7 and the shaft member 9. prevents exerted excessive force on the pins for connecting these pins, etc. will not be damaged.

操作弁３０を戻すと回転体６内の圧縮空気が大気中に排気され、戻し空気室２０内の圧縮空気は圧縮空気流入穴２４を通りピストンバンパ３１の当接面に比べ若干大きな径を有する主ピストン２１を下部より押し上げ、主ピストン２１は初期位置に戻る。同時に、主ピストン２１が移動したことで主ピストン２１とピストンバンパ３１による空気の遮断がなくなりピストン部１３の下部にも戻し空気室２０内の圧縮空気が流入し、ピストン部１３、ドライバビット１１も初期位置に戻る。同時にねじ送り部１９により次のねじ１８がドライバビット１１軸上に送られて初期状態に戻る。   When the operation valve 30 is returned, the compressed air in the rotating body 6 is exhausted to the atmosphere, and the compressed air in the return air chamber 20 passes through the compressed air inflow hole 24 and has a slightly larger diameter than the contact surface of the piston bumper 31. The main piston 21 is pushed up from below, and the main piston 21 returns to the initial position. At the same time, since the main piston 21 has moved, the air is not shut off by the main piston 21 and the piston bumper 31, and the compressed air in the return air chamber 20 flows into the lower portion of the piston portion 13, so that the piston portion 13 and the driver bit 11 are also Return to the initial position. At the same time, the next screw 18 is fed onto the axis of the driver bit 11 by the screw feeding portion 19 to return to the initial state.

主ピストン２１が下死点付近に到達した時点で戻し空気室２０に圧縮空気を供給し始め、ピストン部１３すなわち副ピストンによりねじ締めをしている間も戻し空気室２０に圧縮空気を蓄え、かつその間主ピストン２１とピストンバンパ３１の当接により戻し空気室２０の圧縮空気がピストン部１３下部に流入せず、併せてピストン部１３の下方にあるピストン部１３より小径のつば部２５がねじ締め終了時にピストンバンパ３１に当接するので、ピストン部１３とピストンバンパ３１の間に充分な容積を確保することができ、ピストン部１３下部の空気が圧縮されないのでねじ締め途中でカムアウトが発生せず、ねじ締め終了後すぐに操作弁３０を戻したり、ねじ締めが不完全でピストン部１３が下死点まで到達していない場合でも、上記したように主ピストン２１の下部より押上げるので、ピストン部１３及びドライバビット１１は確実に初期位置に戻り、カムアウトの発生も防止することができる。   When the main piston 21 reaches the vicinity of the bottom dead center, the compressed air is started to be supplied to the return air chamber 20, and the compressed air is stored in the return air chamber 20 while the piston 13 is screwed by the sub piston. During this time, the compressed air in the return air chamber 20 does not flow into the lower portion of the piston portion 13 due to the contact between the main piston 21 and the piston bumper 31, and the flange portion 25 having a smaller diameter than the piston portion 13 below the piston portion 13 is screwed. Since it abuts on the piston bumper 31 at the end of tightening, a sufficient volume can be secured between the piston portion 13 and the piston bumper 31, and the air below the piston portion 13 is not compressed, so that no cam-out occurs during screw tightening. Even if the operation valve 30 is returned immediately after completion of the screw tightening, or the screw 13 is not completely tightened and the piston portion 13 has not reached the bottom dead center, Since pushes up from the bottom of the main piston 21 as the piston 13 and the driver bit 11 is returned to ensure that the initial position, it is possible to prevent the occurrence of come-out.

本発明ねじ締め機の一実施形態で初期状態を示す一部断面側面図。The partial cross section side view which shows an initial state in one Embodiment of this invention screwing machine. 図１からねじ締めが進んだ状態を示す一部断面側面図。The partial cross section side view which shows the state which screwing advanced from FIG. ねじ締め終了状態を示す一部断面側面図。The partial cross section side view which shows the screw tightening completion state.

符号の説明Explanation of symbols

１は本体、７は回転スライド部材、９はシャフト部材、１１はドライバビット、１２はシリンダ、１３はピストン部、２０は戻し空気室、２１は主ピストン、２３は圧縮空気流出穴、２４は圧縮空気流入穴、２５はつば部、３１はピストンバンパである。
1 is a main body, 7 is a rotary slide member, 9 is a shaft member, 11 is a driver bit, 12 is a cylinder, 13 is a piston portion, 20 is a return air chamber, 21 is a main piston, 23 is a compressed air outflow hole, and 24 is compressed An air inflow hole, 25 is a flange portion, and 31 is a piston bumper.

Claims (3)

エアモータと、エアモータによって回転される有底円筒状の回転体と、本体下方に設けられ、下方に圧縮空気流出穴及び圧縮空気流出穴の下方に圧縮空気流入孔を有するシリンダと、シリンダ内を摺動するピストンと、エアモータにより回転されると共にピストン下部に装着されて、ピストンにより軸方向の運動を与えられるドライバビットと、シリンダ下方に設けられ、ねじ締め終了後にピストンが当接するピストンバンパと、シリンダの外周に設けられ、ピストン及びドライバビットを初期位置に戻すための圧縮空気を蓄える戻し空気室とを備えた圧縮空気ねじ締め機であって、前記ピストンを、前記シリンダ内を摺動する如く設けられ、長手方向中間位置に内外を連通する第１連通穴を有する円筒状の主ピストンと、主ピストン内を摺動する如く設けられ、前記回転体内に開口する空気供給穴、長手方向中間位置に空気供給穴と主ピストンの中空部とを連通する第２連通穴、第２連通穴の下方にピストン部を設け、ピストン部の下方にドライバビット装着部とつば部を有する副ピストンによって構成し、ねじ締め終了時に前記つば部が前記ピストンバンパに当接するようにしたことを特徴とする圧縮空気ねじ締め機。 An air motor, a bottomed cylindrical rotating body rotated by the air motor, a cylinder provided below the main body, having a compressed air outflow hole below and a compressed air inflow hole below the compressed air outflow hole, and sliding inside the cylinder A piston that moves, a driver bit that is rotated by an air motor and attached to the lower part of the piston, and is provided with axial movement by the piston, a piston bumper that is provided below the cylinder and that comes into contact with the piston after screw tightening, and a cylinder provided on the outer circumference of a piston and compressed air screw driver with an air chamber return accumulating compressed air for returning the driver bit in the initial position, the piston is provided as to slide in the cylinder A cylindrical main piston having a first communication hole communicating inside and outside at a longitudinally intermediate position, and sliding inside the main piston. It is as provided for the air supply hole that opens to the rotating body, a second communication hole for communicating the hollow portion of the air supply hole and a main piston in a longitudinally intermediate position, the piston portion on the lower side of the second communicating hole provided, A compressed air screw tightening machine comprising a sub-piston having a driver bit mounting portion and a flange portion below a piston portion, wherein the flange portion comes into contact with the piston bumper at the end of screw tightening. 前記副ピストンのピストン部と前記つば部間をピストン部の径よりも細い径の軸部で繋ぎ、ピストン部とつば部間に小容積の空間を形成するようにしたことを特徴とする請求項１記載の圧縮空気ねじ締め機。   The piston portion of the sub-piston and the flange portion are connected by a shaft portion having a diameter smaller than the diameter of the piston portion, and a small volume space is formed between the piston portion and the flange portion. The compressed air screw fastening machine according to 1. 前記つば部をピストン部の径より若干小さい径の円形状としたことを特徴とする請求項１記載の圧縮空気ねじ打機。   The compressed air screw driving machine according to claim 1, wherein the collar portion has a circular shape having a diameter slightly smaller than the diameter of the piston portion.
JP2003343293A 2003-10-01 2003-10-01 Compressed air screwing machine Expired - Lifetime JP4089583B2 (en)

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