JP3520444B2 - How to supply air to the air motor of a pneumatic screw driver - Google Patents
How to supply air to the air motor of a pneumatic screw driverInfo
- Publication number
- JP3520444B2 JP3520444B2 JP25084998A JP25084998A JP3520444B2 JP 3520444 B2 JP3520444 B2 JP 3520444B2 JP 25084998 A JP25084998 A JP 25084998A JP 25084998 A JP25084998 A JP 25084998A JP 3520444 B2 JP3520444 B2 JP 3520444B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- motor
- screw
- striking
- air motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は空気圧式ネジ打込み
機において打込みネジのねじ込み用エアモータに圧縮エ
アを供給するに際し、打撃シリンダに最も近いエアモー
タのハウジングの前端から供給する圧縮エアの供給方法
に関する。
【０００２】
【従来技術】一般に、空気圧式ネジ打込み機は被打込み
材に対して打込みネジを軽く打込んだ後にしっかりと締
め込むものであり、このような打込みとネジ締めの工程
に応じ、それぞれ打込みネジを打撃する打撃機構と、打
込みネジを回転させるネジ締め込み機構とが設けられて
いる。打撃機構は、打撃シリンダ内に摺動自在に収容さ
れた打撃ピストンにドライバビットを一体に結合し、ト
リガの操作によってメインバルブを作動させ、圧縮エア
を貯留するエアチャンバを上記打撃シリンダに対して開
閉し、圧縮エアを打撃シリンダに対して供給して打撃ピ
ストンを駆動するものである。また、ネジ締め込み機構
はエアモータを利用してドライバビットを回転駆動する
もので、エアモータのモータハウジングはネジ打込み機
本体に対して前後に配置されている。そして、エアモー
タへのエア供給は、図５に示されるように打撃シリンダ
２１に供給する圧縮エアの一部をエア通路２２を通して
エアモータ２３のハウジング２４の後ろ側に回り込ま
せ、その後端から供給することにより行なわれていた。
【０００３】
【発明が解決しようとする課題】しかしながら、従来の
エア通路２２は、同図のようにコーナーが多く、複雑で
あったから、エアの通路の全長は長かった。そのため、
通路内の全体の容積が大きいだけでなく、圧縮エアの流
れに対する抵抗が大きく、供給された圧縮エアのエネル
ギーはコーナー部で減衰され、また長い通路を通過する
うちに減衰されてしまうため、圧力損失が大きく、さら
に通路に充満してからモータハウジング内に供給される
ことになるため、ねじ締め込み時にエアモータのトルク
及び回転数がダウンし、締め込みスピードがダウンして
エアモータの効率が低下するという欠点があった。
【０００４】本発明は上記欠点を解消し、圧縮エアを効
率よく使用してエアモータによる打ち込みネジの締め込
みスピードをアップさせることができる空気圧式ネジ打
込み機のエアモータへの給気方法を提供することをその
課題とする。
【０００５】
【課題を解決するための手段】前記課題を解決するた
め、本発明に係る空気圧式ネジ打込み機のエアモータへ
の給気方法は、圧縮エアを貯留するエアチャンバから打
撃シリンダ内に圧縮エアを供給してその内部の打撃ピス
トンに一体に結合したドライバビットと、上記ドライバ
ビットを回転駆動させるエアモータとを備え、上記打撃
シリンダとともにエアモータに圧縮エアを供給し、ドラ
イバビットを駆動して打込みネジを打撃して被打込み材
に対して打込みネジの頭部が浮く程度に打込んだ後に、
上記エアモータにより上記打込みネジを締め込む空気圧
式ネジ打込み機において、上記エアモータのハウジング
の一端にエア供給口を形成し、このエア供給口を上記打
撃シリンダと向き合う側に配置し、上記エアチャンバか
らの圧縮エアを直接にエアモータに供給する際に、上記
エア供給口から供給することを特徴とする。
【０００６】
【発明の実施の形態】図１及び図２はネジ打込み機の要
部の断面を示すもので、このネジ打込み機は打撃機構と
ねじ締め込み機構とを備えている。打撃機構は打撃シリ
ンダ１と打撃シリンダ１内に摺動自在に設けられた打撃
ピストン２と、打撃ピストン２に一体に結合されたドラ
イバビット３とを有し、図示しないトリガを引き操作す
ることにより、メインバルブ４を開き作動させ、圧縮エ
アを貯留するエアチャンバ５（エア供給源に接続してい
る）から打撃シリンダ１内に圧縮エアを供給して軸断面
が多角形状のドライバビット３を打込み作動させるもの
である。
【０００７】また、ねじ締め込み機構は図３に示される
ように、ドライバビット３に嵌合された駆動歯車５と中
間歯車６とエアモータ７とから構成され、エアモータ７
の動力を駆動歯車５に伝達してドライバビット３を回転
駆動するもので、上記打撃機構の作動開始とほぼ同時に
作動し、ドライバビット３をその軸を中心に回転させる
ことにより、ドライバビット３によって打込まれた打込
みネジ（図示せず）を締め込むものである。
【０００８】上記打撃機構によりドライバビット３が打
込みネジを打撃して被打込み材に対して打込みネジの頭
部が浮く程度に打込んだ後にねじ締め込み機構により上
記打込みネジを締め込むもので、このような打撃機構と
ねじ締め込み機構とは、特開平９ー１４１５７１号公
報、特開平９−２９０３７号公報などによって知られる
ように公知の機構である。
【０００９】また、打撃シリンダ１のヘッド部の周囲に
はメインバルブ４が配置されている。メインバルブ４は
環状に形成され、上下方向に摺動することによりその下
端面がエアチャンバＡの内壁の上端８に係合可能に設け
られ、常時はバルブ上室９に圧縮エアが供給され、この
エアとバネ１０の圧力によりメインバルブ４を下降させ
てその下端をエアチャンバＡの内壁の上端８に係合さ
せ、これによりエアチャンバＡを打撃シリンダ１に対し
て閉じている。これに対し、トリガを引き操作し、トリ
ガバルブを作動させて上記バルブ上室９内の圧縮エアを
排出させることにより図２のようにメインバルブ４を上
動させて上述のようにエアチャンバＡを打撃シリンダ１
に開口し、圧縮エアを打撃シリンダ１に供給するのであ
る。
【００１０】なお、エアチャンバＡと打撃シリンダ１と
の間には筒状空間部１１が形成され、エアチャンバＡが
打撃シリンダ１に開口されたときは、エアチャンバＡ内
の圧縮エアは筒状空間部１１を介して打撃シリンダ１に
供給されるように構成されている。
【００１１】次に、圧縮エアはエアチャンバＡから打撃
シリンダ１に供給されるとともに、エアモータ７に供給
される。つまり、メインバルブ４が開き作動することに
より圧縮エアは筒状空間部１１に供給された後、大部分
は打撃シリンダ１に供給されて打撃ピストン２とドライ
バビット３を駆動させ、残りはエア通路１８を経てエア
モータ７に供給される。
【００１２】エア通路１８の一端は上記筒状空間部１１
を介してエアチャンバＡに開口され、さらにストップバ
ルブ１２を経てエアモータ７のハウジング１３の前端壁
のエア供給口１４に開口している。エアチャンバＡ内の
圧縮エアは筒状空間部１１を経てエア通路１８の一端か
ら内部を通り、上記エア供給口１４から直接にハウジン
グ１３内に供給される。供給された圧縮エアは図４に示
されるようにロータ１６の羽根に作用し、そのエア圧で
ロータ１６を回転させる。この回転力は駆動歯車５に伝
達されてドライバビット３を締め込み作動させる。
【００１３】なお、ストップバルブ１２は、図５に符号
１７で示す従来機のものと同様に、ネジ打込み機の射出
部２５に摺動自在に設けられて射出部２５の先端から突
出するようにバネ付勢されたコンタクト部材の一部１７
ａ（図２参照）に係合可能に設けられ、このコンタクト
部材の一部１７ａに係合したときにエア通路１８を遮断
してエアモータ７を停止させるもので、公知のバルブで
ある。すなわち、打撃時にはストップバルブ１２のバル
ブステム１２ａは上動し、エア通路１８を開く。このと
きコンタクト部材は被打込み材の表面に当接し、その後
被打込み材に対して常に同じ位置にある。これに対し、
ねじ締め込み時にはネジ打込み機は図２の矢印のように
ドライバビット３とともに被打込み材に接近移動する。
したがって、ストップバルブ１２の下端突出部１９はコ
ンタクト部材の一部１７ａに接近し、打込みネジが所定
のねじ締め込み深さに至ったときに係合して上記突出部
１９を押し込んでストップバルブ１２が作動してバルブ
ステム１２ａが下動し、エア通路１８を遮断してエアモ
ータ７を停止させるのである。
【００１４】上述のように、エア通路１８によって送ら
れた圧縮エアは、エアモータ７のハウジング１３の後ろ
側に回り込むことなく、打撃シリンダ１に近い前側から
直接に供給されるので、この給気方法によれば、従来に
比べてエア通路１８の全長が短く、コーナー部の数も少
なくなったので、通路抵抗も小さくなり、また圧縮エア
がエアモータ７に達する時間も短くなった。このため、
圧力損失が小さくなり、エアモータ７の効率が向上し、
ねじ締め込み時にエアモータ７のトルク及び回転数が上
がり、締め込みスピードもアップさせることができる。
【００１５】なお、ストップバルブ１２からエアモータ
７に至るエア通路１８は上述の例に限定されない。より
直線的に構成できれば、その方が好ましい。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front end of an air motor housing closest to a striking cylinder when supplying compressed air to an air motor for driving a driving screw in a pneumatic screw driving machine. And a method for supplying compressed air supplied from a computer. 2. Description of the Related Art Generally, a pneumatic screw driving machine is designed to lightly drive a driving screw into a material to be driven and then firmly tighten the driving screw. A hitting mechanism for hitting the driving screw and a screw tightening mechanism for rotating the driving screw are provided. The striking mechanism integrally connects a driver bit to a striking piston housed slidably in the striking cylinder, operates a main valve by operating a trigger, and moves an air chamber for storing compressed air to the striking cylinder. It opens and closes and supplies compressed air to the striking cylinder to drive the striking piston. The screw tightening mechanism uses an air motor to rotationally drive the driver bit, and the motor housing of the air motor is disposed before and after the main body of the screw driving machine. Then, as shown in FIG. 5, the air supply to the air motor is such that a part of the compressed air supplied to the striking cylinder 21 is wrapped around the housing 24 of the air motor 23 through the air passage 22 and supplied from the rear end. It was done by. However, the conventional air passage 22 has many corners and is complicated as shown in FIG. 1, so that the entire length of the air passage is long. for that reason,
Not only is the overall volume in the passage large, but also the resistance to the flow of compressed air is large, and the energy of the supplied compressed air is attenuated at the corners and is attenuated as it passes through the long passage, so pressure Since the loss is large and the passage is filled before being supplied into the motor housing, the torque and the number of revolutions of the air motor are reduced at the time of screw tightening, the tightening speed is reduced, and the efficiency of the air motor is reduced. There was a disadvantage. An object of the present invention is to provide a method of supplying air to an air motor of a pneumatic screw driving machine which can solve the above-mentioned drawbacks and can increase the speed of driving a driving screw by an air motor by efficiently using compressed air. Is the subject. [0005] In order to solve the above-mentioned problems, a method of supplying air to an air motor of a pneumatic screw driving machine according to the present invention comprises the steps of: A driver bit that supplies air and is integrally connected to a striking piston therein, and an air motor that rotates the driver bit, supplies compressed air to the air motor together with the striking cylinder, drives the driver bit, and drives the driver bit. After hitting the screw and hitting the head of the screw into the material to be driven,
In a pneumatic screw driving machine for tightening the driving screw by the air motor, a housing of the air motor is provided.
An air supply port is formed at one end of the
Place it on the side facing the strike cylinder and
When supplying the compressed air directly to the air motor,
It is characterized by being supplied from an air supply port . FIG. 1 and FIG. 2 show a cross section of a main part of a screw driving machine. The screw driving machine has a striking mechanism and a screw tightening mechanism. The striking mechanism has a striking cylinder 1, a striking piston 2 slidably provided in the striking cylinder 1, and a driver bit 3 integrally connected to the striking piston 2. The main valve 4 is opened and compressed air is supplied from the air chamber 5 (connected to the air supply source) for storing compressed air into the striking cylinder 1 to drive the driver bit 3 having a polygonal axial cross section. To operate. Further, as shown in FIG. 3, the screw tightening mechanism comprises a driving gear 5, an intermediate gear 6, and an air motor 7 fitted to the driver bit 3.
Is transmitted to the drive gear 5 to drive the driver bit 3 to rotate. The driver bit 3 operates almost simultaneously with the start of the operation of the striking mechanism, and rotates the driver bit 3 about its axis. The driving screw (not shown) is tightened. [0008] After the driver bit 3 hits the driving screw with the above-mentioned hitting mechanism and hits the head of the driving screw so that the head of the driving screw floats on the material to be driven, the screw driving mechanism tightens the driving screw. Such a striking mechanism and a screw tightening mechanism are known mechanisms as known from Japanese Patent Application Laid-Open Nos. 9-141571 and 9-29037. A main valve 4 is arranged around the head of the striking cylinder 1. The main valve 4 is formed in an annular shape, and its lower end surface is provided so as to be able to engage with the upper end 8 of the inner wall of the air chamber A by sliding vertically, and compressed air is normally supplied to the valve upper chamber 9. The main valve 4 is lowered by the pressure of the air and the spring 10, and the lower end thereof is engaged with the upper end 8 of the inner wall of the air chamber A, thereby closing the air chamber A with respect to the striking cylinder 1. On the other hand, by pulling the trigger and operating the trigger valve to discharge the compressed air in the valve upper chamber 9, the main valve 4 is moved upward as shown in FIG. The impact cylinder 1
The compressed air is supplied to the striking cylinder 1. Incidentally, a cylindrical space 11 is formed between the air chamber A and the striking cylinder 1, and when the air chamber A is opened to the striking cylinder 1, the compressed air in the air chamber A is cylindrical. It is configured to be supplied to the impact cylinder 1 via the space 11. Next, the compressed air is supplied from the air chamber A to the striking cylinder 1 and also to the air motor 7. That is, the compressed air is supplied to the cylindrical space portion 11 by the opening operation of the main valve 4, and then the compressed air is mostly supplied to the striking cylinder 1 to drive the striking piston 2 and the driver bit 3, and the rest is air passage. The electric power is supplied to the air motor 7 via 18. One end of the air passage 18 is connected to the cylindrical space 11.
Through the stop valve 12 and through the stop valve 12 to the air supply port 14 in the front end wall of the housing 13 of the air motor 7. The compressed air in the air chamber A passes through the cylindrical space 11 from one end of the air passage 18 to the inside, and is supplied into the housing 13 directly from the air supply port 14. The supplied compressed air acts on the blades of the rotor 16 as shown in FIG. 4, and the rotor 16 is rotated by the air pressure. This rotational force is transmitted to the drive gear 5 to tighten the driver bit 3 to operate. The stop valve 12 is slidably provided at the injection portion 25 of the screw driving machine and protrudes from the tip of the injection portion 25, similarly to the conventional device indicated by reference numeral 17 in FIG. Part 17 of spring-loaded contact member
a (see FIG. 2), which is a known valve that shuts off the air passage 18 and stops the air motor 7 when it engages with a part 17a of the contact member. That is, at the time of impact, the valve stem 12a of the stop valve 12 moves upward and opens the air passage 18. At this time, the contact member comes into contact with the surface of the material to be driven, and thereafter is always at the same position with respect to the material to be driven. In contrast,
When the screw is tightened, the screw driving machine moves closer to the material to be driven together with the driver bit 3 as shown by the arrow in FIG.
Therefore, the lower end projecting portion 19 of the stop valve 12 approaches the part 17a of the contact member, and engages when the driving screw reaches a predetermined screw tightening depth to push the projecting portion 19 to stop the stop valve 12. Operates to lower the valve stem 12a, shut off the air passage 18 and stop the air motor 7. As described above, the compressed air sent through the air passage 18 is supplied directly from the front side near the striking cylinder 1 without going around the rear side of the housing 13 of the air motor 7. According to the method, the overall length of the air passage 18 is shorter and the number of corners is smaller than in the prior art, so that the passage resistance is reduced and the time for the compressed air to reach the air motor 7 is also reduced. For this reason,
The pressure loss is reduced, the efficiency of the air motor 7 is improved,
When the screw is tightened, the torque and the number of revolutions of the air motor 7 increase, and the tightening speed can be increased. The air passage 18 extending from the stop valve 12 to the air motor 7 is not limited to the above example. If it can be constructed more linearly, it is preferable.
【図面の簡単な説明】
【図１】空気圧式ネジ打込み機の要部の縦断面図
【図２】上記ネジ打込み機の作動態様説明図
【図３】上記ネジ打ち込み機の一部を破断して示す要部
の側面図
【図４】図３のＸーＸ線上の断面図
【図５】従来の給気態様の説明図
【符号の説明】
Ａ エアチャンバ
１ 打撃シリンダ
２ 打撃ピストン
３ ドライバビット
７ エアモータ
１３ ハウジング
１８ エア通路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part of a pneumatic screw driving machine. FIG. 2 is an explanatory view of an operation mode of the screw driving machine. FIG. FIG. 4 is a cross-sectional view taken along the line XX of FIG. 3. FIG. 5 is an explanatory view of a conventional air supply mode. [Description of References] A Air chamber 1 Impact cylinder 2 Impact piston 3 Driver bit 7 Air motor 13 Housing 18 Air passage
Claims (1)
撃シリンダ内に圧縮エアを供給してその内部の打撃ピス
トンに一体に結合したドライバビットと、上記ドライバ
ビットを回転駆動させるエアモータとを備え、上記打撃
シリンダとともにエアモータに圧縮エアを供給し、ドラ
イバビットを駆動して打込みネジを打撃して被打込み材
に対して打込みネジの頭部が浮く程度に打込んだ後に、
上記エアモータにより上記打込みネジを締め込む空気圧
式ネジ打込み機において、 上記エアモータのハウジングの一端にエア供給口を形成
し、このエア供給口を上記打撃シリンダと向き合う側に
配置し、上記エアチャンバからの圧縮エアを直接にエア
モータに供給する際に、上記エア供給口から供給するこ
とを特徴とする空気圧式ネジ打込み機のエアモータへの
給気方法。(57) [Claim 1] A driver bit which supplies compressed air from an air chamber for storing compressed air into a striking cylinder and is integrally connected to a striking piston inside the striking cylinder, and An air motor that rotates and supplies compressed air to the air motor together with the striking cylinder, drives the driver bit to strike the driving screw, and drives the driving screw to the extent that the head of the driving screw floats against the material to be driven. later,
In the pneumatic screw driving machine for tightening the driving screw by the air motor, an air supply port is formed at one end of a housing of the air motor.
And place this air supply port on the side facing the impact cylinder.
Place and direct compressed air from the air chamber above
A method for supplying air to an air motor of a pneumatic screw driving machine, wherein the air is supplied from the air supply port when supplying the air to the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25084998A JP3520444B2 (en) | 1998-09-04 | 1998-09-04 | How to supply air to the air motor of a pneumatic screw driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25084998A JP3520444B2 (en) | 1998-09-04 | 1998-09-04 | How to supply air to the air motor of a pneumatic screw driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000079570A JP2000079570A (en) | 2000-03-21 |
| JP3520444B2 true JP3520444B2 (en) | 2004-04-19 |
Family
ID=17213929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25084998A Expired - Lifetime JP3520444B2 (en) | 1998-09-04 | 1998-09-04 | How to supply air to the air motor of a pneumatic screw driver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3520444B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5112043B2 (en) * | 2007-12-27 | 2013-01-09 | 株式会社マキタ | Screw driving machine |
-
1998
- 1998-09-04 JP JP25084998A patent/JP3520444B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000079570A (en) | 2000-03-21 |
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