JP6538991B2 - Pressed air drive type - Google Patents

Pressed air drive type Download PDF

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JP6538991B2
JP6538991B2 JP2018546714A JP2018546714A JP6538991B2 JP 6538991 B2 JP6538991 B2 JP 6538991B2 JP 2018546714 A JP2018546714 A JP 2018546714A JP 2018546714 A JP2018546714 A JP 2018546714A JP 6538991 B2 JP6538991 B2 JP 6538991B2
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needle
cylinder
compressed air
reverse drive
passage
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JPWO2018180832A1 (en
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史雄 稲垣
史雄 稲垣
啓輔 嶋田
啓輔 嶋田
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Nitto Kohki Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/08—Means for driving the impulse member comprising a built-in air compressor, i.e. the tool being driven by air pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/04—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0015—Anvils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0023—Pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/181—Pneumatic tool components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/275—Tools having at least two similar components
    • B25D2250/285—Tools having three or more similar components, e.g. three motors
    • B25D2250/291—Tools having three or more parallel bits, e.g. needle guns

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

本発明は、圧搾空気により駆動される圧搾空気駆動式タガネに関する。  TECHNICAL FIELD The present invention relates to a compressed air driven tangane driven by compressed air.

圧搾空気駆動式タガネは、筒状部材内に該筒状部材の軸線方向で後方から前方にむけて順次取り付けられ該筒状部材に対してそれぞれ摺動可能とされたピストン、アンビル、及びニードルホルダを有し、該ニードルホルダには前方に延びるニードル（針タガネ）が保持されている。圧搾空気をピストン後部に形成される前進駆動室に供給すると、ピストンが前方に駆動されアンビルの後部を打撃し、アンビルが前方に駆動されて、該アンビルに押されてニードルホルダが前方に駆動される。また、該ニードルホルダが前方に駆動された時点で、前進駆動室の圧搾空気が外部に排出されると共に、ニードルホルダの前端側に形成される後進駆動室に圧搾空気が供給されて、該ニードルホルダ、アンビル及びピストンを後方に戻すようになっている。ニードルホルダが前方に駆動されることにより、当該ニードルの先端が被作業部位を打撃して斫り（はつり）などの所用の作業を行うようになっている。  The compressed air driven tangles are sequentially mounted in the cylindrical member in the axial direction of the cylindrical member from the rear to the front, and are sequentially slidable with respect to the cylindrical member, the anvil, and the needle holder The needle holder holds a forwardly extending needle (needle tongue). When compressed air is supplied to the forward drive chamber formed at the rear of the piston, the piston is driven forward to strike the rear of the anvil, and the anvil is driven forward to be pushed by the anvil to drive the needle holder forward. Ru. Also, when the needle holder is driven forward, compressed air in the forward drive chamber is exhausted to the outside, and compressed air is supplied to the reverse drive chamber formed on the front end side of the needle holder, and the needle The holder, anvil and piston are adapted to be returned to the rear. By driving the needle holder forward, the tip end of the needle strikes the work site to perform a required work such as a swing.

このような圧搾空気式タガネのニードルホルダは、筒状部材の内周面に対して密封係合され該軸線方向で摺動可能とされた大径のホルダ本体と、該ホルダ本体から同軸状に前方に延びて筒状部材の前端開口の内周面に対して密封係合され該軸線方向で摺動可能とされた小径の筒状延長部とを有する。該ホルダ本体はその前端で該筒状延長部の後端の周りに形成された環状前端面を有し、上記後進駆動室は、ニードルホルダを収納している筒状部材の内周面、前端開口の後側面、筒状延長部の外周面、及びホルダ本体の環状前端面により画定されるようになっている。  The needle holder of such a compressed air type tongue is sealingly engaged with the inner peripheral surface of the cylindrical member and made coaxial with the large diameter holder main body which is made slidable in the axial direction. And a small diameter cylindrical extension portion which is forwardly engaged and sealingly engaged with the inner peripheral surface of the front end opening of the cylindrical member so as to be slidable in the axial direction. The holder main body has an annular front end face formed around the rear end of the cylindrical extension at its front end, and the reverse drive chamber is the inner peripheral surface of the cylindrical member housing the needle holder, the front end It is intended to be defined by the rear side of the opening, the outer peripheral surface of the tubular extension and the annular front end of the holder body.

従来のこのような圧搾空気駆動式タガネでは、ホルダ本体に複数のニードルを前後方向にそれぞれ通すニードル保持孔が当該ホルダ本体の半径方向中心の周りに多数設けられると共に、該ホルダ本体の外周面近くにはニードル保持孔に平行に延びてホルダ本体の環状前端面に開口して後進駆動室に圧搾空気を供給するための複数の軸線方向通路が設けられるようになっている。（特許文献１及び２参照）  In such conventional compressed air drive type tangles, a large number of needle holding holes are provided around the radial center of the holder main body, through which a plurality of needles are respectively passed in the longitudinal direction in the holder main body, and near the outer peripheral surface of the holder main body A plurality of axial passages for supplying compressed air to the reverse drive chamber are provided to extend parallel to the needle holding hole and open at the annular front end face of the holder body. (Refer to patent documents 1 and 2)

特開２００６−２８９６０７号Unexamined-Japanese-Patent No. 2006-289607 実公昭６２−１６２９５号Model No. 62-16295

上記特許文献に開示されたような圧搾空気駆動式タガネでは、後進駆動室への圧搾空気供給用の軸線方向孔が上述の如くホルダ本体の環状前端面に開口するようにホルダ本体の外周面近くに設けられるようにされている。ニードルホルダは上述の如くピストンによる打撃により激しく往復動が繰り返されるものであり、このため上記軸線方向孔から当該ホルダ本体外周面までの肉厚はそのような激しい往復動に耐えられるよう十分なものにしなければならず、これは圧搾空気駆動式タガネを小型化するために当該ニードルホルダの外径寸法を小さくしようとするときの制限要素となっていた。  In the compressed air drive type tongue as disclosed in the above-mentioned patent documents, the axial hole for supplying compressed air to the reverse drive chamber is near the outer peripheral surface of the holder main body so as to open at the annular front end face of the holder main body as described above. It is intended to be installed in As described above, the needle holder is strongly reciprocated by the impact of the piston, so that the thickness from the axial hole to the outer peripheral surface of the holder main body is sufficient to withstand such violent reciprocation. This has been a limiting factor when trying to reduce the outer diameter dimension of the needle holder in order to miniaturize the compressed air driven tongue.

本発明は、このような点に鑑み、ニードルホルダの外径寸法を従来のものに比べて小さくすることを可能とする圧搾空気駆動式タガネを提供することを目的とする。  An object of the present invention is to provide a compressed air-driven tongue which enables the outer diameter of the needle holder to be smaller than that of the conventional one.

本発明に係る圧搾空気駆動式タガネは、
後端に設けられた後端閉止部材と、前端に設けられて前端開口を画定する前端筒状部材とを有するシリンダと、
該シリンダ内に該シリンダの軸線方向で摺動可能にされ、複数のニードルを該前端開口から前方に延出するように保持するニードルホルダ及び該ニードルホルダの後方位置に配置されたピストンを含む、可動エレメントであって、該ピストンは該シリンダ内で該ピストンの後部に形成される前進駆動室に圧搾空気が導入されることにより前方に駆動されて該ニードルホルダにその後方から前方への打撃力を加えるようになされており、該ニードルホルダは該シリンダの内周面に対して密封係合され該軸線方向で摺動可能とされた大径のホルダ本体と、該ホルダ本体から前方に延びて該前端筒状部材の内周面に対して密封係合され該軸線方向で摺動可能とされた小径の筒状部とを有し、該ホルダ本体は、その前端で該筒状部の後端の周りに形成された環状前端面と、該ニードルを該筒状部の内側を前後方向で延びるようにして収納する該軸線方向で貫通するニードル保持孔を有し、該ニードルホルダは、該ピストンの打撃力により前方に駆動されて、該環状前端面が該前端筒状部材の後端部に突き当たる前端位置まで変位可能とされており、該シリンダの内周面は該前端筒状部材の後端の位置から該軸線方向後方に延び該ホルダ本体の外周面よりも大径で該ニードルホルダの外周面との間に後進駆動室を画定する室画定凹部を有するようになされている、可動エレメントと、
圧搾空気を前記前進駆動室に供給する前進駆動用通路及び該後進駆動室に供給する後進駆動用通路を有し、該前進駆動用通路及び該後進駆動用通路を介して該圧搾空気を該前進駆動室及び該後進駆動室に交番的に供給するための圧搾空気供給通路であって、該後進駆動用通路は、該シリンダを通り、該ホルダ本体の外周面と摺動係合する該シリンダの内周面に開口する後進駆動用シリンダ通路と、該ホルダ本体の外周面及び該外周面と摺動係合する該シリンダの内周面の少なくとも一方に該軸線方向で延びるように設けられ該後進駆動用シリンダ通路に連通している後進駆動用連通凹部とを有し、該ニードルホルダが該前端位置とされたときに該後進駆動用連通凹部が該後進駆動室に連通されて圧搾空気を該後進駆動室に供給するように構成されている圧搾空気供給通路と、
を有する。The compressed air drive type tangane according to the present invention is
A cylinder having a rear end closing member provided at the rear end, and a front end cylindrical member provided at the front end and defining a front end opening;
A needle holder axially slidable in the cylinder and holding the plurality of needles so as to extend forward from the front end opening, and a piston disposed at a rear position of the needle holder; A movable element, wherein the piston is driven forward by introducing compressed air into an advancing drive chamber formed at the rear of the piston in the cylinder to drive the needle holder from the rear to the front thereof; A needle holder which is sealingly engaged with the inner circumferential surface of the cylinder and is slidable in the axial direction, and extends forward from the holder body. And a small diameter cylindrical portion sealingly engaged with the inner peripheral surface of the front end cylindrical member and made slidable in the axial direction, and the holder main body is disposed behind the cylindrical portion at its front end. Forming around the edge And an axially extending needle holding hole for receiving the needle so as to extend in the front-rear direction so as to extend the needle in the front-rear direction, and the needle holder is driven by the striking force of the piston. Driven forward, the annular front end surface is displaceable to a front end position where it abuts the rear end of the front end cylindrical member, and the inner circumferential surface of the cylinder is from the position of the rear end of the front end cylindrical member A movable element extending rearward in the axial direction and having a chamber defining recess larger in diameter than the outer peripheral surface of the holder body and defining a reverse drive chamber between the outer peripheral surface of the needle holder;
A forward drive passage for supplying compressed air to the forward drive chamber and a reverse drive passage for supplying the reverse drive chamber. The compressed air is advanced through the forward drive passage and the reverse drive passage. A compressed air supply passage for alternately supplying a drive chamber and the reverse drive chamber, wherein the reverse drive passage passes through the cylinder and is in sliding engagement with the outer peripheral surface of the holder body. It is provided to extend in the axial direction on at least one of a reverse drive cylinder passage opened to the inner circumferential surface and the outer circumferential surface of the holder main body and the inner circumferential surface of the cylinder slidingly engaged with the outer circumferential surface. The reverse drive communication recess is in communication with the drive cylinder passage, and when the needle holder is at the front end position, the reverse drive communication recess is in communication with the reverse drive chamber to squeeze compressed air. Configured to supply reverse drive room A compressed air supply passage being,
Have.

本発明に係るこの圧搾空気駆動式タガネにおいては、該ニードルホルダが該前端位置にされたときに後進駆動用シリンダ通路の該開口を該後進駆動室に連通するための通路を、前述の従来のもののようにニードルホルダの外周面近くに軸線方向孔として設けるのではなく、ホルダ本体の外周面及び該外周面と摺動係合する該シリンダの内周面の少なくとも一方に軸線方向で延びるように設けられた凹部（後進駆動用連通凹部）としている。このため上記軸線方向孔を設けた場合に当該ニードルホルダの強度を保つために該軸線方向孔からホルダ本体の外表面までの肉厚を大きくするといった必要がなく、また、圧搾空気供給のために必要とされる流路断面を、ニードルホルダ内を通る軸線方向孔として設けた場合の軸線方向孔の直径寸法に比べて極めて小さな深さ寸法の凹部で同流路断面を得ることが可能となる。このため本発明のこの圧搾空気駆動式タガネでは、ニードルホルダの直径を従来のものに比べて大幅に縮小することが可能となる。  In this compressed air drive type tongue according to the present invention, the passage for connecting the opening of the reverse drive cylinder passage to the reverse drive chamber when the needle holder is at the front end position is the above-mentioned conventional Instead of being provided as an axial hole near the outer peripheral surface of the needle holder as in the above, it extends in the axial direction to at least one of the outer peripheral surface of the holder body and the inner peripheral surface of the cylinder slidingly engaged with the outer peripheral surface. It is set as the provided recessed part (the communication recessed part for reverse drive). Therefore, when the axial hole is provided, there is no need to increase the thickness from the axial hole to the outer surface of the holder main body in order to maintain the strength of the needle holder, and for supplying compressed air. It is possible to obtain the same channel cross section with a recess having a very small depth dimension as compared to the diameter dimension of the axial hole when the required channel cross section is provided as an axial hole passing through the inside of the needle holder . For this reason, in this compressed air drive type tongue of the present invention, the diameter of the needle holder can be greatly reduced as compared with the conventional one.

該後進駆動用連通凹部の具体的例としては、該ホルダ本体の該外周面に形成され、該ホルダ本体の該外周面における前端と該後進駆動用連通凹部の軸線方向前端との間の部分が該シリンダの該内周面に密封係合している状態では該後進駆動用連通凹部の該後進駆動室との連通を阻止するようにされるようなものとすることができる。  As a specific example of the reverse drive communication recess, a portion formed on the outer peripheral surface of the holder body and between the front end of the outer periphery of the holder body and the axial front end of the reverse drive communication recess is In the state of sealing engagement with the inner peripheral surface of the cylinder, communication between the reverse drive communication recess and the reverse drive chamber may be blocked.

より具体的には、該後進駆動用連通凹部は該ホルダ本体の該外周面の周方向で延びる環状凹部とすることができる。  More specifically, the reverse drive communication recess may be an annular recess extending in the circumferential direction of the outer peripheral surface of the holder body.

該後進駆動用連通凹部としては、上記のホルダ本体の外周面に設けたものに換えて又はそれに加えて、該シリンダの該内周面に形成され、該後進駆動用シリンダ通路の該開口と該室画定凹部との間に延在するように設け、該ホルダ本体の該外周面が該後進駆動用連通凹部に対して密封係合し該後進駆動用シリンダ通路の該開口よりも前方で該後進駆動用連通凹部に摺動可能とされている密封凸部を有し、該密封凸部は該ニードルホルダが該前端位置にされたときに該後進駆動用連通凹部から前方に離れ、該後進駆動用連通凹部を介して該後進駆動用シリンダ通路を該室画定凹部に連通するようにすることができる。  The backward drive communication recess is formed on the inner circumferential surface of the cylinder instead of or in addition to the one provided on the outer circumferential surface of the holder main body, and the opening of the reverse drive cylinder passage and the recess. The outer peripheral surface of the holder body is in sealing engagement with the reverse drive communication recess so as to extend between the chamber defining recess and the reverse drive forward of the opening of the reverse drive cylinder passage. The sealing protrusion is made slidable in the driving communication recess, and the sealing protrusion is separated forward from the reverse driving communication recess when the needle holder is at the front end position, and the reverse driving is performed. The reverse drive cylinder passage may be in communication with the chamber defining recess via the communication communication recess.

該ニードル保持孔はそれぞれ該ニードル保持孔の後端近くから該ホルダ本体の後端面に向けて次第に拡径するニードル頭部受け部を有し、該ニードル頭部受け部は該ニードル保持孔に挿通されて保持されるニードルの後端部に設けられる頭部を該頭部の後端が該ニードル頭部受け部から後方に突出するように受け入れるようにされており、該ニードルホルダの後端面にその周縁に沿って該突出したニードルの頭部よりも後方に突出した環状突起部を有するようにすることができる。ニードル間の間隔を狭めやすいようにするものである。
この場合の該ニードルの頭部は該ニードル頭部受け部に対応して後方に向けて次第に広がる側面を有するようなものとすることができる。Each of the needle holding holes has a needle head receiving portion which gradually expands in diameter from the vicinity of the rear end of the needle holding hole toward the rear end surface of the holder body, and the needle head receiving portion is inserted into the needle holding hole The head provided at the rear end of the needle to be held and held is received so that the rear end of the head protrudes rearward from the needle head receiving portion, and the rear end face of the needle holder is It is possible to have an annular projection which protrudes rearward from the head of the protruding needle along its periphery. It is intended to make it easy to narrow the distance between the needles.
The head of the needle in this case may be such that it has a side surface that gradually widens rearwardly corresponding to the needle head receptacle.

具体的には、
該シリンダを同軸状にして収納する筒状のハウジングを有し、
該シリンダの外周面と該ハウジングの内周面との間に該軸線方向で延びるように形成され、該ハウジング内に導入された圧搾空気を該シリンダの外周面に沿って通す圧搾空気供給通路を有し、該後進駆動用シリンダ通路は該シリンダを半径方向で貫通して該圧搾空気供給通路に連通したものとすることができる。In particular,
A cylindrical housing for coaxially receiving the cylinder;
It is formed to extend in the axial direction between the outer peripheral surface of the cylinder and the inner peripheral surface of the housing, and a compressed air supply passage for passing the compressed air introduced into the housing along the outer peripheral surface of the cylinder is formed. The reverse drive cylinder passage may radially pass through the cylinder and communicate with the compressed air supply passage.

該圧搾空気供給通路は該シリンダと該ハウジングとの間に形成された筒状の通路とすることができる。  The compressed air supply passage may be a cylindrical passage formed between the cylinder and the housing.

該可動エレメントは、該ピストンと該ニードルホルダとの間に該軸線方向で変位可能に設けられたアンビルを有し、該アンビルは前方に駆動されたピストンによって後方から打撃されて前方に駆動され該ニードルホルダに該ピストンからの打撃力を伝えるようになされており、
該ニードルホルダはその直径方向中心を軸線方向に貫通する排気通路を有し、該排気通路は該ニードルホルダが該前端位置となったときに該前進駆動室に連通され該前進駆動室内の圧搾空気を該ニードルホルダの前方外部に排出するようにすることができる。The movable element has an anvil axially displaceably provided between the piston and the needle holder, the anvil being impacted from behind by the forward driven piston and driven forward. It is designed to transmit the striking force from the piston to the needle holder,
The needle holder has an exhaust passage axially penetrating its diametrical center, the exhaust passage being in communication with the forward drive chamber when the needle holder is at the front end position, and squeezing air in the forward drive chamber Can be discharged to the front outside of the needle holder.

該ニードル保持孔のそれぞれに該軸線方向で変位可能に保持され該ニードルホルダから軸線方向前方に延びて該シリンダの該前端開口から前方に延出する該ニードルを更に有し、該頭部が、該ニードル頭部受け部から後方に突出する該後端から前方に向かって次第に縮径する側面を有し、該側面が該ニードル頭部受け部の面に当接するようにすることができる。  The needle holding hole further includes the needle axially displaceably held in each of the needle holding holes and extending axially forward from the needle holder and extending forward from the front end opening of the cylinder, the head It is possible to have a side surface which gradually reduces in diameter forward from the rear end projecting rearward from the needle head support portion so that the side surface abuts on the surface of the needle head support portion.

以下、本発明に係る圧搾空気駆動式タガネの実施形態を添付図面に基づき説明する。  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a compressed air driven tagane according to the present invention will be described based on the attached drawings.

本発明の一実施形態に係る圧搾空気駆動式タガネの斜視図である。It is a perspective view of compressed air drive type tongue which concerns on one Embodiment of this invention. 図１の圧搾空気駆動式タガネが駆動されていない状態の縦断面図である。It is a longitudinal cross-sectional view of the state which is not driving the compressed air drive type tongue of FIG. 図２の縦断面図における一部を拡大して示す図である。It is a figure which expands and shows a part in the longitudinal cross-sectional view of FIG. 図２と同様の図であるが、前進駆動室に圧搾空気が導入されてピストンが前進しアンビルを打撃している状態を示している。FIG. 5 is a view similar to FIG. 2 but showing compressed air being introduced into the forward drive chamber to advance the piston and impacting the anvil. 図４の縦断面図における一部を拡大して示す図である。It is a figure which expands and shows a part in the longitudinal cross-sectional view of FIG. 図２と同様の図であるが、ニードルホルダが前端位置に至ったときの状態を示している。FIG. 7 is a view similar to FIG. 2, but showing a state when the needle holder has reached the front end position. 図６の縦断面図における一部を拡大して示す図である。It is a figure which expands and shows a part in the longitudinal cross-sectional view of FIG.

図１に示すように本発明に係る圧搾空気駆動式タガネ１０は、複数（図においては６本）のニードル（針タガネ）１２を備え、当該圧搾空気駆動式タガネ１０の後端の空気導入孔１１（図２）に接続される図示しない圧搾空気供給管を通して導入される圧搾空気によりニードル１２を全体として前後に駆動し、その先端で被作業部位を打撃して斫り（はつり）などの作業を行うものである。  As shown in FIG. 1, the compressed air drive type tangane 10 according to the present invention includes a plurality (six in the figure) of needles (needle taps) 12, and an air introduction hole at the rear end of the compressed air driven type tangane 10. The needle 12 is driven back and forth as a whole by compressed air introduced through a compressed air supply pipe (not shown) connected to 11 (FIG. 2), and the tip of the work is hit and struck with the tip of the work. To do.

図２に示すように、圧搾空気駆動式タガネ１０は、筒状のハウジング１４と、該ハウジング１４内に同軸状に取り付けられたシリンダ１６とを有する。当該圧搾空気駆動式タガネ１０はさらに、該シリンダ１６内において軸線方向で後方から前方に順次取り付けられたピストン１８、アンビル２０、及びニードルホルダ２２を有する。ニードルホルダ２２は、各ニードル１２を当該ニードルホルダ２２の前端開口１７から前方に延出するように保持している。図示の例では、ハウジング１４はハウジング後部１４ａと該ハウジング後部１４ａに結合されたハウジング前部１４ｂとからなる。シリンダ１６は筒状のシリンダ本体１６ａと、該シリンダ本体１６ａの後端に取り付けられ該後端を閉じる後端閉止部材１６ｂと、シリンダ本体１６ａの前端に取り付けられて前方に延び、前端開口１７を画定している前端筒状部材１６ｃとからなる。  As shown in FIG. 2, the compressed air driven tongue 10 has a cylindrical housing 14 and a cylinder 16 coaxially mounted in the housing 14. The compressed air driven tongue 10 further includes a piston 18, an anvil 20, and a needle holder 22 which are sequentially attached from the rear to the front in the axial direction in the cylinder 16. The needle holder 22 holds each needle 12 so as to extend forward from the front end opening 17 of the needle holder 22. In the illustrated example, the housing 14 comprises a housing rear 14a and a housing front 14b coupled to the housing rear 14a. The cylinder 16 is provided with a cylindrical cylinder body 16a, a rear end closing member 16b attached to the rear end of the cylinder body 16a and closing the rear end, attached to the front end of the cylinder body 16a and extending forward and having a front end opening 17 And a front end tubular member 16c.

シリンダ１６内にはピストン１８と後端閉止部材１６ｂとの間に前進駆動室２４（図２、図４、図６）が、ニードルホルダ２２と前端筒状部材１６ｃとの間に後進駆動室２６が形成され、ハウジング後部１４ａに設けられたバルブ２８を介して上述の空気導入孔１１に連通されてハウジング１４の内周面とシリンダ１６の外周面との間に延びる筒状の圧搾空気供給通路３０を通して前進駆動室２４と後進駆動室２６に圧搾空気が交番的に供給されるようになっている。  A forward drive chamber 24 (FIGS. 2, 4 and 6) is disposed in the cylinder 16 between the piston 18 and the rear end closing member 16b, and a reverse drive chamber 26 between the needle holder 22 and the front end cylindrical member 16c. Is formed and is communicated with the above-described air introduction hole 11 through a valve 28 provided in the housing rear portion 14a to extend between the inner peripheral surface of the housing 14 and the outer peripheral surface of the cylinder 16 Pressurized air is alternately supplied to the forward drive chamber 24 and the reverse drive chamber 26 through 30.

具体的には、圧搾空気供給通路３０はシリンダ１６の後方寄りに半径方向で貫通するように設けられた前進駆動用シリンダ通路１６ｄに連通される後方通路部３０ａと、該後方通路部３０ａから前方に延びてシリンダ１６の前方寄りに半径方向で貫通するように設けられた後進駆動用シリンダ通路１６ｅに連通される前方通路部３０ｂとを有している。ピストン１８はその外周面に、後方寄りの位置から前端まで延びるように設けられている小径部１８ａと、小径部１８ａの後側の大径部１８ｂとを有しており、小径部１８ａ及び大径部１８ｂはシリンダ１６の内周面のそれぞれ対応する直径の部分と密封係合され且つ摺動可能とされている。小径部１８ａには直径方向で貫通する前進駆動用直径方向通路１８ｄが設けられ、前進駆動用直径方向通路１８ｄからはピストン１８の後端面まで延びて前進駆動室２４に連通する前進駆動用軸方向通路１８ｃが設けられている。前進駆動用シリンダ通路１６ｄを通された圧搾空気は、シリンダ１６が図２に示す後端位置にあるときに、シリンダ１６の内周面と小径部１８ａとの間に形成される空間３２、前進駆動用直径方向通路１８ｄ、前進駆動用軸方向通路１８ｃを通して前進駆動室２４に供給されるようになっている。後進駆動用シリンダ通路１６ｅはニードルホルダ２２が前方に駆動されたときに、ニードルホルダ２２の外周面に設けられた後進駆動用環状凹部２２ａ（図７）を介して圧搾空気を後進駆動室２６に供給できるようになっている。ニードルホルダ２２は、具体的には、シリンダ１６の内周面に対して密封係合し摺動可能とされた大径のホルダ本体２２ｂと、ホルダ本体２２ｂから前方に延びて前端筒状部材１６ｃの内周面に対して密封係合され摺動可能とされる小径の筒状部２２ｃとを有する。ホルダ本体２２ｂはその前端で筒状部２２ｃの後端の周りに形成された環状前端面２２ｄを有しており、ニードルホルダ２２は、アンビル２０によって前方に駆動されたときに、環状前端面２２ｄが前端筒状部材１６ｃの後端部に突き当たる前端位置まで変位可能とされている。上述の後進駆動用環状凹部２２ａはホルダ本体２２ｂの外周面にその前端及び後端から離れた中間位置に設けられている。シリンダ１６の内周面は、前端筒状部材１６ｃの後端の位置から軸線方向後方に延びホルダ本体２２ｂの外周面よりも大径でニードルホルダ２２の外周面との間に後進駆動室２６を画定する室画定凹部１６ｆを有している。ニードルホルダ２２が前方に駆動されたとき（図６、図７）に後進駆動用環状凹部２２ａが後進駆動室２６に連通する状態となり、該後進駆動室２６に圧搾空気が供給されるようになっている。  Specifically, the compressed air supply passage 30 communicates with a forward drive cylinder passage 16d provided radially penetrating the rear side of the cylinder 16, and a forward passage from the rear passage 30a. And a forward passage portion 30b communicated with a reverse drive cylinder passage 16e provided radially penetrating the cylinder 16 in the forward direction. The piston 18 has, on its outer peripheral surface, a small diameter portion 18a provided so as to extend from the rear position to the front end, and a large diameter portion 18b on the rear side of the small diameter portion 18a. The diameter portion 18 b is sealingly engaged and slidable with the corresponding diameter portion of the inner circumferential surface of the cylinder 16. The small diameter portion 18a is provided with a forward drive diametrical passage 18d penetrating in the diameter direction, and the forward drive axial direction extends from the forward drive diametrical passage 18d to the rear end surface of the piston 18 and communicates with the forward drive chamber 24. A passage 18c is provided. The compressed air that has passed through the forward drive cylinder passage 16d advances in the space 32 formed between the inner peripheral surface of the cylinder 16 and the small diameter portion 18a when the cylinder 16 is at the rear end position shown in FIG. It is supplied to the forward drive chamber 24 through the drive diametrical passage 18d and the forward drive axial passage 18c. When the needle holder 22 is driven forward, compressed air is transferred to the reverse drive chamber 26 via the reverse drive annular recess 22 a (FIG. 7) provided on the outer peripheral surface of the needle holder 22. It can be supplied. Specifically, the needle holder 22 is a large diameter holder main body 22b which is sealingly engaged with the inner peripheral surface of the cylinder 16 and made slidable, and extends forward from the holder main body 22b to form a front end cylindrical member 16c. And a small diameter cylindrical portion 22c which is sealingly engaged with and slidable with respect to the inner peripheral surface of the housing. The holder main body 22b has an annular front end face 22d formed around the rear end of the cylindrical portion 22c at its front end, and when the needle holder 22 is driven forward by the anvil 20, the annular front end face 22d Is displaceable to the front end position where it abuts on the rear end of the front end tubular member 16c. The above-mentioned reverse drive annular recess 22a is provided on the outer peripheral surface of the holder body 22b at an intermediate position apart from the front end and the rear end. The inner peripheral surface of the cylinder 16 extends rearward in the axial direction from the position of the rear end of the front end cylindrical member 16c and has a larger diameter than the outer peripheral surface of the holder main body 22b and the reverse drive chamber 26 between it and the outer peripheral surface of the needle holder 22. It has a chamber-defining recess 16f defining it. When the needle holder 22 is driven forward (FIG. 6, FIG. 7), the reverse drive annular recess 22a is in communication with the reverse drive chamber 26, and compressed air is supplied to the reverse drive chamber 26. ing.

ニードルホルダ２２は、ホルダ本体２２ｂを前後方向で貫通しそれぞれニードル１２を保持するニードル保持孔２２ｅと、ホルダ本体２２ｂの横断面中心を前後方向で貫通している排気通路２２ｆとを有している。ニードル保持孔２２ｅはその後端近くからホルダ本体２２ｂの後端面に向けて次第に拡径する傾斜面２２ｈを有するニードル頭部受け部２２ｇを有し、ニードル１２はニードル頭部受け部２２ｇの傾斜面２２ｈに対応する側面１２ａを有するニードル頭部１２ｂを備える。ニードル頭部１２ｂがニードル頭部受け部２２ｇに受け入れられた状態では、ニードル頭部１２ｂの側面１２ａがニードル頭部受け部２２ｇの傾斜面２２ｈに当接し、ニードル頭部１２ｂの後端がニードル頭部受け部２２ｇから後方に突出するようにされている。ニードルホルダ２２の後端面にはその周縁に沿って、ニードル頭部受け部２２ｇから後方に突出したニードル頭部１２ｂよりもさらに後方に突出した環状突起部２２ｊを有しており、アンビル２０はこの環状突起部２２ｊを介してニードルホルダ２２への前方駆動力を伝達するようになっている。ニードル１２はニードル頭部１２ｂが上記のごときニードル頭部受け部２２ｇに受け入れられることによりニードル保持孔２２ｅとの整合が行われ、ニードル１２がぶれにくいようにされている。  The needle holder 22 has a needle holding hole 22e which penetrates the holder body 22b in the front-rear direction and holds the needle 12, and an exhaust passage 22f which penetrates the center of the cross section of the holder body 22b in the front-rear direction . The needle holding hole 22e has a needle head receiving portion 22g having an inclined surface 22h gradually expanding in diameter from near the rear end toward the rear end surface of the holder body 22b, and the needle 12 has an inclined surface 22h of the needle head receiving portion 22g. A needle head 12b having a side surface 12a corresponding to When the needle head 12b is received by the needle head receiving portion 22g, the side surface 12a of the needle head 12b abuts on the inclined surface 22h of the needle head receiving portion 22g, and the rear end of the needle head 12b is the needle head It is made to project back from part support part 22g. The rear end face of the needle holder 22 has, along its periphery, an annular projection 22j which protrudes further rearward than the needle head 12b which protrudes backward from the needle head receiving portion 22g, and the anvil 20 The forward driving force to the needle holder 22 is transmitted through the annular projection 22 j. The needle 12 is aligned with the needle holding hole 22e by the needle head 12b being received by the needle head receiving portion 22g as described above, and the needle 12 is prevented from blurring.

圧搾空気駆動式タガネ１０が図２に示す圧搾空気が導入されていない不作動の状態において、ハウジング後部１４ａに枢着されたレバー３４を下げてバルブ２８を開放すると、圧搾空気は上述の通り圧搾空気供給通路３０の後方通路部３０ａ、前進駆動用シリンダ通路１６ｄ、前進駆動用直径方向通路１８ｄ、前進駆動用軸方向通路１８ｃを介して前進駆動室２４に供給される。これによりピストン１８は前方に駆動され、その前端に設けられている打撃突起１８ｅによりアンビル２０を後方から打撃する（図４、図５）。この状態では前進駆動室２４から延びる前進駆動用直径方向通路１８ｄがアンビル２０の後側に形成された空間３５に連通された状態となり、ピストン１８を前方に駆動した前進駆動室２４内の圧搾空気は、アンビル２０に設けられた軸方向孔２０ａを通してアンビル２０の前端面とニードルホルダ２２の後端面との間にある空間３６に通され、ニードルホルダ２２の排気通路２２ｆを介して外部に排気されるようになる。このとき、ホルダ本体２２ｂの外周面の後進駆動用環状凹部２２ａはまだ後進駆動室２６に連通しておらず、後進駆動室２６には圧搾空気が供給されない。ニードルホルダ２２が前進駆動されるときは、後進駆動室２６の容積が縮小されることになるが、該後進駆動室２６内の空気は、ニードルホルダ２２の筒状部２２ｃに設けられている半径方向排気孔２２ｉを通して外部に排出され、ニードルホルダ２２は後進駆動室２６内の空気圧による抵抗を実質的に受けることなく前進できるようにされている。  When the lever 34 pivotally attached to the housing rear portion 14a is lowered and the valve 28 is opened in a non-operational state where the compressed air driven tang 10 is not introduced with the compressed air shown in FIG. 2, the compressed air is compressed as described above The air is supplied to the forward drive chamber 24 through the rear passage portion 30a of the air supply passage 30, the forward drive cylinder passage 16d, the forward drive diametrical passage 18d, and the forward drive axial passage 18c. As a result, the piston 18 is driven forward, and the anvil 20 is hit from behind by the striking projection 18e provided at the front end thereof (FIG. 4, FIG. 5). In this state, the forward drive diametrical passage 18d extending from the forward drive chamber 24 is in communication with the space 35 formed on the rear side of the anvil 20, and compressed air in the forward drive chamber 24 which drives the piston 18 forward. The air passes through an axial hole 20a provided in the anvil 20 to a space 36 between the front end face of the anvil 20 and the rear end face of the needle holder 22, and is exhausted to the outside through an exhaust passage 22f of the needle holder 22. Become so. At this time, the reverse drive annular recess 22 a on the outer peripheral surface of the holder body 22 b is not yet communicated with the reverse drive chamber 26, and compressed air is not supplied to the reverse drive chamber 26. When the needle holder 22 is driven forward, the volume of the reverse drive chamber 26 is reduced, but the air in the reverse drive chamber 26 has a radius provided to the cylindrical portion 22 c of the needle holder 22. The needle holder 22 is discharged to the outside through the direction exhaust hole 22i so that the needle holder 22 can be advanced without substantially receiving resistance due to the air pressure in the reverse drive chamber 26.

ピストン１８により後方から打撃されたアンビル２０は前方に駆動されてニードルホルダ２２を前方に駆動し、該ニードルホルダ２２は前端筒状部材１６ｃと衝突する前端位置となる（図６、図７）。この状態では後進駆動用環状凹部２２ａは後進駆動室２６に連通され、圧搾空気が後進駆動室２６に供給され、ニードルホルダ２２の後方への駆動が開始される。ニードルホルダ２２によってアンビル２０及びピストン１８が図２に示す状態に戻されると、再び圧搾空気によりピストン１８が前方へ駆動される。このようにして、ニードルホルダ２２の往復動が繰り返され、ニードル１２による被作業部位への打撃作業が行われる。  The anvil 20 impacted from behind by the piston 18 is driven forward to drive the needle holder 22 forward, and the needle holder 22 comes to a front end position where it collides with the front end cylindrical member 16c (FIG. 6, FIG. 7). In this state, the reverse drive annular recess 22a is in communication with the reverse drive chamber 26, compressed air is supplied to the reverse drive chamber 26, and the rearward drive of the needle holder 22 is started. When the anvil 20 and the piston 18 are returned to the state shown in FIG. 2 by the needle holder 22, the compressed air drives the piston 18 forward again. In this manner, the reciprocating movement of the needle holder 22 is repeated, and the striking work on the work site by the needle 12 is performed.

以上、本発明の一実施形態を説明したが、本発明はこれに限定されるものではない。例えば上述した実施形態では、ニードルホルダ２２が前方に駆動されたときに後進駆動用シリンダ通路１６ｅを後進駆動室２６に連通するのにホルダ本体２２ｂの外周面に設けた後進駆動用環状凹部２２ａによって行っているが、この後進駆動用環状凹部をシリンダ１６の内周面に後進駆動用シリンダ通路１６ｅと室画定凹部１６ｆとの間に延在するように設けるようにすることができる。この場合は、ホルダ本体２２ｂの外周面に、この後進駆動用連通凹部に対して密封係合し後進駆動用シリンダ通路１６ｅよりも前方で後進駆動用連通凹部に摺動可能とされている密封凸部を設け、ニードルホルダ２２が前端位置に向けて駆動されたときにこの密封凸部が後進駆動用連通凹部から前方に離れ、それにより後進駆動用シリンダ通路１６ｅと室画定凹部１６ｆが連通されるようにすることができる。また、シリンダ本体と、後端閉止部材と、前端筒状部材とは別体のものとして示したが、これらは一体に成形することもできる。  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to this. For example, in the embodiment described above, when the needle holder 22 is driven forward, the reverse drive cylinder passage 16e is communicated with the reverse drive chamber 26 by the reverse drive annular recess 22a provided on the outer peripheral surface of the holder body 22b. Although the reverse drive annular recess can be provided on the inner peripheral surface of the cylinder 16 so as to extend between the reverse drive cylinder passage 16e and the chamber defining recess 16f. In this case, a sealing protrusion is sealingly engaged with the backward drive communication recess on the outer peripheral surface of the holder main body 22b and slidable in the reverse drive communication recess forward of the reverse drive cylinder passage 16e. The sealing projection separates forward from the reverse drive communication recess when the needle holder 22 is driven toward the front end position, whereby the reverse drive cylinder passage 16e is communicated with the chamber defining recess 16f. You can do so. Also, although the cylinder body, the rear end closing member, and the front end tubular member are shown as separate members, they can be integrally formed.

圧搾空気駆動式タガネ１０；
空気導入口１１；
ニードル（針タガネ）１２；
側面１２ａ；
頭部１２ｂ；
ハウジング１４；
ハウジング後部１４ａ；
ハウジング前部１４ｂ；
シリンダ１６；
シリンダ本体１６ａ；
後端閉止部材１６ｂ；
前端筒状部材１６ｃ；
前進駆動用シリンダ通路１６ｄ；
後進駆動用シリンダ通路１６ｅ；
室画定凹部１６ｆ；
ピストン１８；
小径部１８ａ；
大径部１８ｂ；
前進駆動用軸方向通路１８ｃ；
前進駆動用直径方向通路１８ｄ；
打撃突起１８ｅ；
アンビル２０；
軸方向孔２０ａ；
ニードルホルダ２２；
後進駆動用環状凹部２２ａ；
ホルダ本体２２ｂ；
筒状部２２ｃ；
環状前端面２２ｄ；
ニードル保持孔２２ｅ
排気通路２２ｆ
ニードル頭部受け部２２ｇ；
傾斜面２２ｈ；
半径方向排気孔２２ｉ；
環状突起部２２ｊ；
前進駆動室２４；
後進駆動室２６；
バルブ２８；
圧搾空気供給通路３０；
後方通路部３０ａ；
前方通路部３０ｂ；
空間３２；
レバー３４；
空間３５、３６

Compressed air drive type tongue 10;
Air inlet 11;
Needle (needle tagane) 12;
Side 12a;
Head 12b;
Housing 14;
Housing rear 14a;
Housing front 14b;
Cylinder 16;
Cylinder body 16a;
Rear end closing member 16b;
Front end tubular member 16c;
Forward drive cylinder passage 16d;
Reverse drive cylinder passage 16e;
Chamber defining recess 16f;
Piston 18;
Small diameter portion 18a;
Large diameter portion 18b;
Forward drive axial passage 18c;
Forward drive diametrical passage 18d;
Hitting protrusion 18e;
Anvil 20;
Axial holes 20a;
Needle holder 22;
Reverse drive annular recess 22a;
Holder body 22b;
Cylindrical portion 22c;
Annular front end face 22d;
Needle holding hole 22e
Exhaust passage 22f
Needle head support 22g;
Inclined surface 22h;
Radial exhaust holes 22i;
Annular projection 22j;
Forward drive chamber 24;
Reverse drive room 26;
Valve 28;
Compressed air supply passage 30;
Rear passage portion 30a;
Front passage 30b;
Space 32;
Lever 34;
Space 35, 36

Claims (9)

後端に設けられた後端閉止部材と、前端に設けられて前端開口を画定する前端筒状部材とを有するシリンダと、
該シリンダ内に該シリンダの軸線方向で摺動可能にされ、複数のニードルを該前端開口から前方に延出するように保持するニードルホルダ及び該ニードルホルダの後方位置に配置されたピストンを含む、可動エレメントであって、該ピストンは該シリンダ内で該ピストンの後部に形成される前進駆動室に圧搾空気が導入されることにより前方に駆動されて該ニードルホルダにその後方から前方への打撃力を加えるようになされており、該ニードルホルダは該シリンダの内周面に対して密封係合され該軸線方向で摺動可能とされた大径のホルダ本体と、該ホルダ本体から前方に延びて該前端筒状部材の内周面に対して密封係合され該軸線方向で摺動可能とされた小径の筒状部とを有し、該ホルダ本体は、その前端で該筒状部の後端の周りに形成された環状前端面と、該ニードルを該筒状部の内側を前後方向で延びるようにして収納する該軸線方向で貫通するニードル保持孔を有し、該ニードルホルダは、該ピストンの打撃力により前方に駆動されて、該環状前端面が該前端筒状部材の後端部に突き当たる前端位置まで変位可能とされており、該シリンダの内周面は該前端筒状部材の後端の位置から該軸線方向の後方に延び該ホルダ本体の外周面よりも大径で該ニードルホルダの外周面との間に後進駆動室を画定する室画定凹部を有するようになされている、可動エレメントと、
圧搾空気を前記前進駆動室に供給する前進駆動用通路及び該後進駆動室に供給する後進駆動用通路を有し、該前進駆動用通路及び該後進駆動用通路を介して該圧搾空気を該前進駆動室及び該後進駆動室に交番的に供給するための圧搾空気供給通路であって、該後進駆動用通路は、該シリンダを通り、該ホルダ本体の外周面と摺動係合する該シリンダの内周面に開口する後進駆動用シリンダ通路と、該ホルダ本体の外周面及び該外周面と摺動係合する該シリンダの内周面の少なくとも一方に該軸線方向で延びるように設けられ該後進駆動用シリンダ通路に連通している後進駆動用連通凹部とを有し、該ニードルホルダが該前端位置とされたときに該後進駆動用連通凹部が該後進駆動室に連通されて圧搾空気を該後進駆動室に供給するように構成されている圧搾空気供給通路と、
を有する圧搾空気駆動式タガネ。A cylinder having a rear end closing member provided at the rear end, and a front end cylindrical member provided at the front end and defining a front end opening;
A needle holder axially slidable in the cylinder and holding the plurality of needles so as to extend forward from the front end opening, and a piston disposed at a rear position of the needle holder; A movable element, wherein the piston is driven forward by introducing compressed air into an advancing drive chamber formed at the rear of the piston in the cylinder to drive the needle holder from the rear to the front thereof; A needle holder which is sealingly engaged with the inner circumferential surface of the cylinder and is slidable in the axial direction, and extends forward from the holder body. And a small diameter cylindrical portion sealingly engaged with the inner peripheral surface of the front end cylindrical member and made slidable in the axial direction, and the holder main body is disposed behind the cylindrical portion at its front end. Forming around the edge And an axially extending needle holding hole for receiving the needle so as to extend in the front-rear direction so as to extend the needle in the front-rear direction, and the needle holder is driven by the striking force of the piston. Driven forward, the annular front end surface is displaceable to a front end position where it abuts the rear end of the front end cylindrical member, and the inner circumferential surface of the cylinder is from the position of the rear end of the front end cylindrical member A movable element extending rearward in the axial direction and having a chamber defining recess larger in diameter than the outer peripheral surface of the holder body and defining a reverse drive chamber between the outer peripheral surface of the needle holder;
A forward drive passage for supplying compressed air to the forward drive chamber and a reverse drive passage for supplying the reverse drive chamber. The compressed air is advanced through the forward drive passage and the reverse drive passage. A compressed air supply passage for alternately supplying a drive chamber and the reverse drive chamber, wherein the reverse drive passage passes through the cylinder and is in sliding engagement with the outer peripheral surface of the holder body. It is provided to extend in the axial direction on at least one of a reverse drive cylinder passage opened to the inner circumferential surface and the outer circumferential surface of the holder main body and the inner circumferential surface of the cylinder slidingly engaged with the outer circumferential surface. The reverse drive communication recess is in communication with the drive cylinder passage, and when the needle holder is at the front end position, the reverse drive communication recess is in communication with the reverse drive chamber to squeeze compressed air. Configured to supply reverse drive room A compressed air supply passage being,
Has a compressed air-driven tongue. 該後進駆動用連通凹部が該ホルダ本体の該外周面に形成され、該ホルダ本体の該外周面における前端と該後進駆動用連通凹部の軸線方向前端との間の部分が該シリンダの該内周面に密封係合している状態では該後進駆動用連通凹部の該後進駆動室との連通を阻止するようにされている請求項1に記載の圧搾空気駆動式タガネ。  The reverse drive communication recess is formed on the outer peripheral surface of the holder body, and a portion between the front end of the outer peripheral surface of the holder body and the axial front end of the reverse drive communication recess is the inner periphery of the cylinder. The compressed air drive type tongue according to claim 1, wherein communication between the reverse drive communication concave portion and the reverse drive chamber is blocked in the state of sealing engagement with the surface. 該後進駆動用連通凹部は該ホルダ本体の該外周面の周方向で延びる環状凹部とされている請求項２に記載の圧搾空気駆動式タガネ。  The compressed air drive type tongue according to claim 2, wherein the backward drive communication recess is an annular recess extending in the circumferential direction of the outer peripheral surface of the holder body. 該後進駆動用連通凹部が該シリンダの該内周面に形成され、該後進駆動用シリンダ通路の該開口と該室画定凹部との間に延在し、該ホルダ本体の該外周面は該後進駆動用連通凹部に対して密封係合し該後進駆動用シリンダ通路の該開口よりも前方で該後進駆動用連通凹部に摺動可能とされている密封凸部を有し、該密封凸部は該ニードルホルダが該前端位置にされたときに該後進駆動用連通凹部から前方に離れ、該後進駆動用連通凹部を介して該後進駆動用シリンダ通路を該室画定凹部に連通するようにする請求項１に記載の圧搾空気駆動式タガネ。  The reverse drive communication recess is formed on the inner circumferential surface of the cylinder and extends between the opening of the reverse drive cylinder passage and the chamber defining recess, and the outer circumferential surface of the holder body is reverse A sealing protrusion which is sealingly engaged with the driving communication recess and is slidable in the reverse driving communication recess in front of the opening of the reverse driving cylinder passage; When the needle holder is at the front end position, the needle holder is separated forward from the reverse drive communication recess, and the reverse drive cylinder passage is communicated with the chamber defining recess through the reverse drive communication recess. Item 4. The compressed air-driven tagane according to item 1. 該ニードル保持孔はそれぞれ該ニードル保持孔の後端近くから該ホルダ本体の後端面に向けて次第に拡径するニードル頭部受け部を有し、該ニードル頭部受け部は該ニードル保持孔に挿通されて保持されるニードルの後端部に設けられる頭部を該頭部の後端が該ニードル頭部受け部から後方に突出するようにして受け入れるようにされており、該ニードルホルダの後端面にその周縁に沿って該突出したニードルの頭部よりも後方に突出した環状突起部を有する請求項１乃至４のいずれか一項に記載の圧搾空気駆動式タガネ。  Each of the needle holding holes has a needle head receiving portion which gradually expands in diameter from the vicinity of the rear end of the needle holding hole toward the rear end surface of the holder body, and the needle head receiving portion is inserted into the needle holding hole The head provided at the rear end of the needle to be held is held so that the rear end of the head protrudes rearward from the needle head receiving portion, and the rear end face of the needle holder The squeeze-air driven type tongue according to any one of claims 1 to 4, further comprising an annular protrusion protruding rearward from a head of the protruding needle along its periphery. 該シリンダを同軸状にして収納する筒状のハウジングを有し、
該シリンダの外周面と該ハウジングの内周面との間に該軸線方向で延びるように形成され、該ハウジング内に導入された圧搾空気を該シリンダの外周面に沿って通す圧搾空気供給通路を有し、該後進駆動用シリンダ通路は該シリンダを半径方向で貫通して該圧搾空気供給通路に連通している請求項１乃至５のいずれか一項に記載の圧搾空気駆動式タガネ。A cylindrical housing for coaxially receiving the cylinder;
It is formed to extend in the axial direction between the outer peripheral surface of the cylinder and the inner peripheral surface of the housing, and a compressed air supply passage for passing the compressed air introduced into the housing along the outer peripheral surface of the cylinder is formed. The compressed air drive type tongue according to any one of claims 1 to 5, wherein the reverse drive cylinder passage radially penetrates the cylinder and communicates with the compressed air supply passage. 該圧搾空気供給通路は該シリンダと該ハウジングとの間に形成された筒状の通路とされている請求項６に記載の圧搾空気駆動式タガネ。  The compressed air drive type tongue according to claim 6, wherein the compressed air supply passage is a cylindrical passage formed between the cylinder and the housing. 該可動エレメントは、該ピストンと該ニードルホルダとの間に該軸線方向で変位可能に設けられたアンビルを有し、該アンビルは前方に駆動されたピストンによって後方から打撃されて前方に駆動され該ニードルホルダに該ピストンからの打撃力を伝えるようになされており、
該ニードルホルダはその直径方向中心を軸線方向に貫通する排気通路を有し、該排気通路は該ニードルホルダが該前端位置となったときに該前進駆動室に連通され該前進駆動室内の圧搾空気を該ニードルホルダの前方外部に排出するようにされている請求項１乃至７のいずれか一項に記載の圧搾空気駆動式タガネ。The movable element has an anvil axially displaceably provided between the piston and the needle holder, the anvil being impacted from behind by the forward driven piston and driven forward. It is designed to transmit the striking force from the piston to the needle holder,
The needle holder has an exhaust passage axially penetrating its diametrical center, the exhaust passage being in communication with the forward drive chamber when the needle holder is at the front end position, and squeezing air in the forward drive chamber The compressed air-driven tagane according to any one of claims 1 to 7, wherein the compressed air is driven to the outside of the front of the needle holder. 該ニードル保持孔のそれぞれに該軸線方向で変位可能に保持され該ニードルホルダから軸線方向前方に延びて該シリンダの該前端開口から前方に延出する該ニードルを更に有し、該頭部が、該ニードル頭部受け部から後方に突出する該後端から前方に向かって次第に縮径する側面を有し、該側面が該ニードル頭部受け部の面に当接するようにされている請求項５に記載の圧搾空気駆動式タガネ。

The needle holding hole further includes the needle axially displaceably held in each of the needle holding holes and extending axially forward from the needle holder and extending forward from the front end opening of the cylinder, the head The needle head receiving portion has a side surface which gradually reduces in diameter forward from the rear end projecting rearward from the needle head receiving portion, and the side surface is in contact with the surface of the needle head receiving portion. The compressed air-powered tagane described in.

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