JP2004122358A - Method and device for screwing - Google Patents

Method and device for screwing Download PDF

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JP2004122358A
JP2004122358A JP2003387028A JP2003387028A JP2004122358A JP 2004122358 A JP2004122358 A JP 2004122358A JP 2003387028 A JP2003387028 A JP 2003387028A JP 2003387028 A JP2003387028 A JP 2003387028A JP 2004122358 A JP2004122358 A JP 2004122358A
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piston
drive bit
screw
tightened
cylinder
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Yasuki Omori
大森　康希
Mitsuo Ogura
小倉　光雄
Yasuo Sasaki
佐々木　康雄
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Koki Holdings Co Ltd
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Hitachi Koki Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To surely perform driving and screwing, even if a fastened material is hard. <P>SOLUTION: While a distal end of a drive bit is fitted to a screw head part groove to drive a distal end of a screw into the fastened material up to a prescribed depth, the drive bit is advanced with strong pressing force by both of a first piston 3 sliding within a cylinder 2 and a second piston 21 passing through the first piston 3. When the screw is screwed into the fastened material after driven into the fastened material, sliding of the first piston 3 is stopped by a stopper 40 provided on an inner wall of the cylinder 2, and the drive bit is advanced with weak pressing force by only the second piston 21. <P>COPYRIGHT: (C)2004,JPO

Description

　本発明は圧縮空気を動力源としてねじを被締付材にねじ込むねじ込み方法及びねじ込み装置に関するものである。 The present invention relates to a method and a device for screwing a screw into a member to be tightened using compressed air as a power source.

　かかる圧縮空気を動力源としてねじ込むねじ込み機は例えば特許文献１、２により提案されている。その構成は、ねじを回すドライブビットと、ドライブビットを回転駆動するエアモータと、ドライブビットを圧縮空気により下降させるピストン部からなる。 ね じ Screwing machines for screwing such compressed air as a power source are proposed in, for example, Patent Documents 1 and 2. The configuration includes a drive bit for turning a screw, an air motor for rotating the drive bit, and a piston for lowering the drive bit with compressed air.

特開平１−４５５７９号公報（図1）JP-A-1-45579 (FIG. 1)

特開平５−２６１６７６号公報（図1〜図３）JP-A-5-261676 (FIGS. 1 to 3)

　従来の圧縮空気ねじ込み機では、ドライブビットが回転しながら下降し、ねじ頭部の溝と嵌合した後、更にねじ先端が被締付材に突き当たることによって、圧縮空気は更にドライブビットを下方に押圧しようとするが、ねじが被締付材に突き当たっているのでドライブビットがなかなか下方に移動できず、ねじ込み機本体が浮き上がる方向に反動が生じる。ねじ込み機本体が浮き上がってしまうと、ねじと嵌合していたドライブビットがねじ溝より外れてしまい、ねじが締め付けられないという問題があった。 In the conventional compressed air screwing machine, the drive bit descends while rotating, fits into the groove of the screw head, and then the screw tip hits the material to be tightened. Although the driver tries to press the screw, the drive bit cannot move easily downward because the screw is in contact with the material to be tightened, and a reaction occurs in the direction in which the screwing machine body rises. If the screwing machine body rises, the drive bit fitted with the screw comes off the screw groove, and there is a problem that the screw cannot be tightened.

　上記問題点を解決するために、特公昭６０−４７０７５号公報における釘打機の反動を低減する機構を用いる方法があるが、これはピストン上部と下部の空気圧力差をなくし、打撃時の反動を低減する方法である。すなわちピストン下部に圧縮空気を流入するため、シリンダとハウジング間に空気室を設ける必要がある。釘打機本体に作用する反動は低減できるが、容積、形状が大きくなり、重量的に重くなる。またピストン下部に圧縮空気が流れ込むため、ピストン下死点近傍でのピストン推力が減じられ、しかも空気消費量が多くなるという新たな問題点を生じる。 In order to solve the above-mentioned problem, there is a method using a mechanism for reducing the recoil of a nailing machine disclosed in Japanese Patent Publication No. 60-47075. It is a method of reducing. That is, since compressed air flows into the lower part of the piston, it is necessary to provide an air chamber between the cylinder and the housing. The recoil acting on the nailing machine main body can be reduced, but the volume and shape become large and the weight becomes heavy. Further, since compressed air flows into the lower part of the piston, a new problem arises in that the thrust of the piston near the bottom dead center of the piston is reduced and the air consumption is increased.

　またねじ込み機においては、通常一般の釘打機のように一度に大きな打込み力で打込むようにすると、ねじの締結力が弱くなる問題がある。このため打込み力を小さくすると被締付材が例えば鉄板等の硬いものの場合、打込むことができなくなる恐れがあり次段のねじ込みができなくなるという問題があった。 In a screwing machine, if a large driving force is applied at a time as in a general nailing machine, there is a problem that the fastening force of the screw is weakened. For this reason, when the driving force is reduced, when the material to be tightened is a hard material such as an iron plate, there is a possibility that the driving may not be performed, and there is a problem that the screwing at the next stage cannot be performed.

　本発明の目的は、上記した従来の問題点を解決し、操作性が良くねじを確実にねじ込みすることが可能なねじ込み方法及びねじ込み装置を提供することである。 の An object of the present invention is to solve the above-mentioned conventional problems and to provide a screwing method and a screwing device which are easy to operate and can screw a screw surely.

　上記目的は、ドライブビットの先端をねじ頭部溝に嵌合させてねじ先端を被締付材に所定の深さまで打込むまでの間、シリンダ内を摺動する第１ピストンと、第１ピストンを貫通する第２ピストンとの両方によって強い押付け力でドライブビットを前進させ、ねじが被締付材に打込まれた後ねじを被締付材にねじ込む時には、シリンダの内壁に設けられたストッパにより第１ピストンの摺動を停止させ、第２ピストンのみによる弱い押付け力でドライブビットを前進させることにより達成される。 The above object is to provide a first piston that slides in a cylinder until the tip of a drive bit is fitted into a screw head groove and the tip of the screw is driven into a material to be tightened to a predetermined depth. When the drive bit is advanced by a strong pressing force by both the second piston and the screw, the screw is driven into the material to be tightened, and then the screw is screwed into the material to be tightened. This is achieved by stopping the sliding of the first piston and advancing the drive bit with a weak pressing force by only the second piston.

　本発明によれば、打込みかつねじ込み作業を確実に行うことが可能となる。 According to the present invention, the driving and screwing work can be performed reliably.

　本発明を圧縮空気式ねじ込み機に採用した一実施形態を図１に示す。ねじ込み機本体１の外枠を形成するハウジング３０と、該ハウジング３０内に回転可能に支持されたエアモータ１３と、エアモータ１３の軸中心部に、該エアモータ１３のロータ１６から構成されるシリンダ２を設ける。該シリンダ２内にはバルブシール部２１、スプライン軸８を有する移動部材７が一体的に上下に往復動可能でかつエアモータ１３の回転駆動力が移動部材７に伝達されるよう移動部材７の下部のスプライン軸８下部外周がボールスプライン１４により保持されている。 FIG. 1 shows an embodiment in which the present invention is applied to a compressed air type screwing machine. A housing 30 forming an outer frame of the screwing machine main body 1, an air motor 13 rotatably supported in the housing 30, and a cylinder 2 including a rotor 16 of the air motor 13 at a shaft center of the air motor 13. Provide. A moving member 7 having a valve seal portion 21 and a spline shaft 8 can reciprocate up and down integrally in the cylinder 2 and a lower portion of the moving member 7 so that the rotational driving force of the air motor 13 is transmitted to the moving member 7. The outer periphery of the lower part of the spline shaft 8 is held by the ball spline 14.

　前記スプライン軸８は、下端がクラッチ部１５と係合し、前記回転及び上下駆動動力をクラッチ部１５を介してドライブビット９に伝達する。バルブシール部２１のバルブ端２３とスプライン軸８の上端間を連結するシャフト（以下バルブシャフトという）は中空の可動ピストン３を貫通し、後述する如く、可動ピストン３はバルブシャフトに沿って上下動すなわち進退する。スプライン８上端に設けられた肩部２２と可動ピストン３の凹部上端との間にスプリング４が介在されている。 The lower end of the spline shaft 8 is engaged with the clutch unit 15, and transmits the rotation and vertical driving power to the drive bit 9 via the clutch unit 15. A shaft (hereinafter referred to as a valve shaft) connecting the valve end 23 of the valve seal portion 21 and the upper end of the spline shaft 8 penetrates the hollow movable piston 3, and the movable piston 3 moves up and down along the valve shaft as described later. That is, it moves forward and backward. The spring 4 is interposed between the shoulder 22 provided at the upper end of the spline 8 and the upper end of the concave portion of the movable piston 3.

　前記バルブシール部２１は可動ピストン３を貫通して下動するもので、本発明第２ピストン２０を構成し、可動ピストン３はシリンダ２内を摺動するもので本発明第１ピストンを構成する。 The valve seal portion 21 moves downward through the movable piston 3 and constitutes the second piston 20 of the present invention. The movable piston 3 slides in the cylinder 2 and constitutes the first piston of the present invention. .

　次に本発明の動作について説明する。
ねじ込み機本体を被締付材１００に押し付けると、プッシュレバー１２が上方に移動し、トリガ５が操作可能となる。トリガ５を操作してトリガバルブを動作させると、ヘッドバルブ２４の上面にあるヘッドバルブ上室６内の圧縮空気が大気中に排出されヘッドバルブ上室６内を減圧することによりヘッドバルブ２４は上方に移動し、蓄圧室１１から入気路２０を介して可動ピストン３、バルブシール部２１及びエアモータ１３に圧縮空気が供給される。エアモータ１３に供給された圧縮空気はロータ１６を回転させた後大気に排出される。 Next, the operation of the present invention will be described.
When the screwing machine main body is pressed against the tightened member 100, the push lever 12 moves upward, and the trigger 5 becomes operable. When the trigger 5 is operated by operating the trigger 5, the compressed air in the head valve upper chamber 6 on the upper surface of the head valve 24 is exhausted to the atmosphere, and the pressure in the head valve upper chamber 6 is reduced. The air moves upward, and compressed air is supplied from the accumulator 11 to the movable piston 3, the valve seal 21, and the air motor 13 through the air passage 20. The compressed air supplied to the air motor 13 is discharged to the atmosphere after rotating the rotor 16.

　可動ピストン３の受圧面積Ｓ１は、シリンダ２の内側断面積からバルブシール部２１の前記バルブシャフトの断面積分を引いた値となる。またバルブシール部２１の受圧面積Ｓ２はバルブシャフトの断面積となる。 The pressure receiving area S 1 of the movable piston 3 is a value obtained by subtracting the sectional integral of the valve shaft of the valve seal portion 21 from the sectional area inside the cylinder 2. The pressure receiving area S 2 of the valve seal part 21 is the cross-sectional area of the valve shaft.

　可動ピストン３、バルブシール部２１に供給された圧縮空気は、移動部材７すなわちドライブビット９を前進させる。ドライブビット９を前進させる力Ｆ３は、上記した如く、可動ピストン３の受圧面積Ｓ１にかかる圧縮空気の力Ｆ１＝Ｐ×
Ｓ１（Ｐは圧縮空気の圧力、Ｆ１を以下第１力という）とバルブシール部２１の受圧面積Ｓ２にかかる圧縮空気の力Ｆ２＝Ｐ×Ｓ２（以下第２力という）との和Ｆ３＝Ｆ１＋Ｆ２であり、ドライブビット９は最も大きな力Ｆ３（以下第３力という）で前進される。 The compressed air supplied to the movable piston 3 and the valve seal portion 21 advances the moving member 7, that is, the drive bit 9. Force F 3 to advance the drive bit 9, as described above, the force F 1 = P × compressed air according to the pressure receiving area S 1 of the movable piston 3
S 1 (P is the pressure of the compressed air, F 1 is hereinafter referred to as a first force) and the force F 2 of the compressed air applied to the pressure receiving area S 2 of the valve seal portion 21 = P × S 2 (hereinafter referred to as a second force). the sum F 3 = F 1 + F 2 of the drive bit 9 is advanced the largest force F 3 (hereinafter referred to as third force).

　ドライブビット９が前進することによりドライブビット９先端がバンド１７に保持されたネジ１０頭部の図示しない溝に嵌合してねじ１０をバンド１７から外す。ドライブビット９先端がねじ１０に嵌合してバンド１７から外す際、ドライブビット９は抵抗を受けドライブビット９の前進速度は若干低下するが、抵抗を受ける時間は僅かであり、バルブシール部２１と可動ピストン３はほぼ同じ速度で前進する。 As the drive bit 9 advances, the tip of the drive bit 9 is fitted into a groove (not shown) of the head of the screw 10 held by the band 17 and the screw 10 is removed from the band 17. When the tip of the drive bit 9 is fitted to the screw 10 and detached from the band 17, the drive bit 9 receives resistance and the forward speed of the drive bit 9 is slightly reduced. And the movable piston 3 advance at substantially the same speed.

　ドライブビット９が図３の位置まで前進し、ねじ１０先端が石膏ボード３１を突き抜け木材３２に入り込む際の抵抗により、ドライブビット９は急激に前進速度が減少する。 3) The drive bit 9 advances forward to the position shown in FIG. 3, and the speed at which the drive bit 9 advances abruptly decreases due to resistance when the tip of the screw 10 penetrates the gypsum board 31 and enters the wood 32.

　この状態で圧縮空気は、バルブシール部２１を前進させてドライブビット９を更に前進させようとするが、ドライブビット９に押し込まれているねじ１０が木材３２から受ける抵抗により移動できなくなる。そのためバルブシール部２１上の圧縮空気によりねじ込み機本体１が持ち上がろうとするが、スプライン軸８上の肩部２２と可動ピストン３間に設けたスプリング４を圧縮変形させて可動ピストン３が下降するため、ねじ込み機本体１が被締付材１００から浮き上がることはない。 で In this state, the compressed air attempts to further advance the drive bit 9 by advancing the valve seal portion 21, but the compressed air cannot move due to the resistance received from the wood 32 by the screw 10 pushed into the drive bit 9. Therefore, the screwing machine main body 1 tends to lift due to the compressed air on the valve seal portion 21, but the movable piston 3 descends by compressively deforming the spring 4 provided between the shoulder 22 on the spline shaft 8 and the movable piston 3. Therefore, the screwing machine main body 1 does not rise from the tightened member 100.

　ドライブビット９の前進が進み、可動ピストン３の先端が、エアモータ１３のロータ１６すなわちシリンダ２の内側に突き出たストッパ４０に当接すると、可動ピストン３の前進は停止する。図３の状態から可動ピストン３の前進が停止する状態まですなわちねじ１０先端が被締付材１００すなわち木材３２に所定深さ打ち込まれるまでの間、ドライブビット９は前記第３力Ｆ３により前進させられ、可動ピストン３は第１力Ｆ１により前進され、一方ドライブビット９はねじ１０を介して木材３２の抵抗を受けるので、可動ピストン３はスプリング４を圧縮変形させながら前進するようになる。可動ピストン３の前進が停止すると、可動ピストン３を前進させていた圧縮空気の力すなわち第１力Ｆ１はスプリング４のバネ力Ｆ４=ＫＸ（Ｋはスプリング４のバネ定数、Ｘはスプリング４の変位量）に変換される。すなわちＦ４=ＫＸ=Ｆ１となる。 When the drive bit 9 advances, and the tip of the movable piston 3 comes into contact with the rotor 16 of the air motor 13, that is, the stopper 40 protruding inside the cylinder 2, the advance of the movable piston 3 stops. Between the state of FIG. 3 to the advancement of the movable piston 3 is driven a predetermined depth until i.e. screw 10 tips the fastener member 100 i.e. timber 32 is stopped, the drive bit 9 forward by the third force F 3 The movable piston 3 is advanced by the first force F 1 , while the drive bit 9 receives the resistance of the wood 32 through the screw 10, so that the movable piston 3 advances while compressively deforming the spring 4. . When the advance of the movable piston 3 stops, the force of the compressed air that has advanced the movable piston 3, that is, the first force F 1 is the spring force F 4 = KX of the spring 4 (K is the spring constant of the spring 4, and X is the spring 4 To the displacement). That is, F 4 = KX = F 1.

　可動ピストン３の前進が停止すると、ドライブビット９は、前記第２力Ｆ２とスプリング４に蓄えられたバネ力Ｆ４＝ＫＸの和すなわちＦ５＝Ｆ２＋Ｆ４の力で前進させられる。バネ力Ｆ４はドライブビット９が前進するに従って変位量Ｘが小さくなり最終的にはＸ≒０となるので、ドライブビット９は第３力Ｆ３より小さい第２力Ｆ２で前進すなわち押し進められるようになる。従って、ねじ１０は小さい力で押し進められるようになり、ねじ１０のリードに沿ってねじ込められるようになって確実に締め付けられるようになる。 The forward movable piston 3 is stopped, the drive bit 9 is advanced by the force of the sum i.e. F 5 = F 2 + F 4 of the second force F 2 and the spring force stored in the spring 4 F 4 = KX. The spring force F 4 is the X ≒ 0 and eventually displacement X becomes smaller as the drive bit 9 is advanced, the drive bit 9 is advanced i.e. pushed in the third force F 3 is less than the second force F 2 Become like Therefore, the screw 10 can be pushed with a small force, and can be screwed along the lead of the screw 10 so that the screw 10 can be securely tightened.

　上記した実施形態によれば、ねじが所定深さまで打込れるまでの間は、可動ピストン３とバルブシール部２１との両方による強い押付け力でドライブビット9を前進させるので、確実に打込めることができ、ねじ込む際はバルブシール部２１による弱い押付け力でドライブビット９を前進させるので確実にねじ込めるようになる。この結果、被締付材が鉄板等の硬いものであっても確実に打込みかつねじ込むことが可能となる。更にねじの締結力も小さくなることがなくねじ込み作業が確実に行われるようになるという作用効果を奏し得るようになる。 According to the above-described embodiment, the drive bit 9 is advanced by a strong pressing force by both the movable piston 3 and the valve seal portion 21 until the screw is driven to the predetermined depth, so that the driving bit can be reliably driven. When the screw is screwed in, the drive bit 9 is advanced with a weak pressing force by the valve seal portion 21, so that the screw can be screwed securely. As a result, even if the material to be tightened is a hard material such as an iron plate, it can be reliably driven and screwed. Furthermore, the effect that the screwing operation can be performed reliably without reducing the fastening force of the screw can be obtained.

本発明のねじ込み装置の一実施形態を示す断面図。Sectional drawing which shows one Embodiment of the screwing apparatus of this invention. 図１の動作状態を示す断面図。FIG. 2 is a sectional view showing the operation state of FIG. 1. 図１の要部を示す一部拡大断面図。FIG. 2 is a partially enlarged sectional view showing a main part of FIG. 1. 図１のねじ込み終了後の状態を示す断面図。FIG. 2 is a sectional view showing a state after the screwing of FIG. 1 is completed.

符号の説明Explanation of reference numerals

　１はねじ込み機本体、２はシリンダ、３は可動ピストン、４はスプリング、７は移動部材、８はスプライン軸、９はドライブビット、１０はねじ、１３はエアモータ、１７はバンド、２１はバルブシール部、３０はハウジング、３１は石膏ボード、３２は木材、１００は被締付材である。
1 is a screwing machine main body, 2 is a cylinder, 3 is a movable piston, 4 is a spring, 7 is a moving member, 8 is a spline shaft, 9 is a drive bit, 10 is a screw, 13 is an air motor, 17 is a band, and 21 is a valve seal. Reference numeral 30 denotes a housing, 31 denotes a gypsum board, 32 denotes wood, and 100 denotes a material to be tightened.

Claims (2)

ドライブビットの先端をねじ頭部の溝に嵌合させ、嵌合したねじをドライブビットの前進によりねじ連結帯から外し、更にねじ先端を被締付材に所定の深さまで打込み、ドライブビットを回転させつつねじをねじ込む方法において、
　ドライブビットの先端をねじ頭部溝に嵌合させてねじ先端を被締付材に所定の深さまで打込むまでの間、シリンダ内を摺動する第１ピストンと、第１ピストンを貫通する第２ピストンとの両方によって強い押付け力でドライブビットを前進させ、ねじが被締付材に打込まれた後ねじを被締付材にねじ込む時には、シリンダの内壁に設けられたストッパにより第１ピストンの摺動を停止させ、第２ピストンのみによって弱い押付け力でドライブビットを前進させることを特徴とするねじ込み方法。 Fit the tip of the drive bit into the groove of the screw head, remove the fitted screw from the screw connection band by advancing the drive bit, and drive the drive bit into the material to be tightened to a predetermined depth and rotate the drive bit In the method of screwing the screw while
A first piston that slides in the cylinder and a first piston that penetrates the first piston until the tip of the drive bit is fitted into the screw head groove and the tip of the screw is driven into the material to be tightened to a predetermined depth. When the drive bit is advanced by a strong pressing force by both of the two pistons and the screw is driven into the material to be tightened and the screw is screwed into the material to be tightened, the first piston is moved by the stopper provided on the inner wall of the cylinder. A screwing method comprising: stopping the sliding of the drive bit; and advancing the drive bit with a weak pressing force only by the second piston. シリンダと、シリンダ内を圧縮空気によって往復動されるピストンと、ピストンによって駆動されるドライブビットと、ドライブビットを回転させる手段とを備え、ドライブビットの先端をねじ頭部の溝に嵌合させ、嵌合したねじをドライブビットの前進によりねじ連結帯から外し、更にねじ先端を被締付材に所定の深さまで打込み、回転するドライブビットによってねじを被締付材にねじ込むねじ込み装置であって、
　前記ピストンを、シリンダ内壁面に接しつつシリンダの軸方向に往復動可能な中空の第１ピストンと、第１ピストンの中空部を貫通して第１ピストン内をシリンダの軸方向に往復動可能な第２ピストンとにより構成し、第２ピストンはドライブビットに連結されており、ピストンは、ドライブビットの先端をねじ頭部溝に嵌合させてねじ先端を被締付材に所定の深さまで打込むまでの間、第１ピストン及び第２ピストンによって強い押付け力でドライブビットを前進させるように構成され、ねじが被締付材に打込まれた後第１ピストンの前進を停止させる手段が設けられ、第２ピストンの前進のみによる弱い押付け力でドライブビットを前進させることを特徴とするねじ込み装置。
A cylinder, a piston reciprocated by compressed air in the cylinder, a drive bit driven by the piston, and means for rotating the drive bit, wherein the tip of the drive bit is fitted into a groove in the screw head, A screwing device for removing a fitted screw from a screw connection band by advancing a drive bit, further driving a screw tip into a material to be tightened to a predetermined depth, and screwing the screw into the material to be tightened by a rotating drive bit,
A hollow first piston that can reciprocate in the axial direction of the cylinder while being in contact with the inner wall surface of the cylinder, and a piston that can reciprocate in the axial direction of the cylinder in the first piston through the hollow portion of the first piston And a second piston connected to the drive bit. The piston fits the tip of the drive bit into the groove of the screw head and strikes the tip of the screw against the material to be tightened to a predetermined depth. And a means for stopping the advancement of the first piston after the screw is driven into the material to be tightened, the drive bit being configured to be advanced with a strong pressing force by the first piston and the second piston until the drive bit is inserted. And a drive bit which advances the drive bit with a weak pressing force only by the advance of the second piston.
JP2003387028A 1995-06-09 2003-11-17 Method and device for screwing Withdrawn JP2004122358A (en)

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JP14316595 1995-06-09
JP2003387028A JP2004122358A (en) 1995-06-09 2003-11-17 Method and device for screwing

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JP10739296A Division JP3531350B2 (en) 1995-06-09 1996-04-26 Compressed air screw tightening machine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009154270A (en) * 2007-12-27 2009-07-16 Makita Corp Screw driving machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009154270A (en) * 2007-12-27 2009-07-16 Makita Corp Screw driving machine

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