JP3861343B2

JP3861343B2 - Driving machine

Info

Publication number: JP3861343B2
Application number: JP29157196A
Authority: JP
Inventors: 禎紀石沢
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 1996-11-01
Filing date: 1996-11-01
Publication date: 2006-12-20
Anticipated expiration: 2016-11-01
Also published as: JPH10138164A

Description

【０００１】
【産業上の利用分野】
本発明は、トリガを操作している間はピストン及びドライバーブレードが上下動を繰り返す自動反復機能を有する打込機に関するものである。
【０００２】
【従来の技術】
自動反復機能を有する従来の打込機の一例として特公平７−９６１８８号を挙げ、これを図７に示す。
図に示す打込機は、釘をネイルガイド２６内に挿入し、釘先端を図示しない被打込材に押し当ててプッシュレバー２８を上方に押し上げ、トリガ２７のロックを解除し、その後トリガ２７を操作してトリガバルブ１１を開くことによりピストン４及びピストン４に取付けられたドライバブレード２３が下降して釘を被打込材に打込むものである。
図に示すように、ヘッドバルブ６上室８とトリガバルブ１１とは第１空気通路１０と第２空気通路１２とにより連通されており、第１空気通路１０と第２空気通路１２との間には反復バルブ１６が設けられ、反復バルブ１６によって第１空気通路１０と第２空気通路１２との連通は制御される。なお、第２空気通路１２はトリガバルブ１１が開くと大気と連通する。
【０００３】
以下、図に示す打込機の打込動作を詳細に説明する。
トリガ２７を操作しトリガバルブ１１が開くと、ヘッドバルブ上室８内の圧縮空気が第１空気通路１０、第２空気通路１２を介して大気に放出される。このため、ヘッドバルブ６が上昇し、蓄圧室２の圧縮空気がシリンダ３内に流入され、ピストン４及びドライバブレード２３が急激に下降して、ネイルガイド２６内に挿入された釘を被打込材に打込む。
ピストン４下降の際にピストン４下側の空気は、シリンダ３下方に設けられた連通穴２１ａを介して、戻り空気室１３内に流入される。また、ピストン４が逆止弁２２を備えた連通穴２１ｂを通過すると、シリンダ３のピストン４上側の圧縮空気は、連通穴２１ｂから戻り空気室１３内に流入される。
戻り空気室１３に流入した圧縮空気は、第３空気通路１５を介して反復バルブ下室１４に到達し反復バルブ１６を上昇させ、第１空気通路１０と第２空気通路１２との連通を遮断する。
【０００４】
ヘッドバルブ６が上昇している際には、ヘッドバルブ上室８と蓄圧室２がヘッドバルブ６に設けられた空気通路６ａを介して連通するため、蓄圧室２の圧縮空気がヘッドバルブ上室８内に流入して、ヘッドバルブ上室８及び第１空気通路１０の圧力が上昇する。反復バルブ１６は、上部受圧面積が下部受圧面積より小さいため下降せず、第１空気通路１０と第２空気通路１２との連通を遮断した状態を維持する。一方、ヘッドバルブ６はヘッドバルブ上室８の圧力上昇と共にヘッドバルブスプリング２９の押圧力で下降し、シリンダ３と蓄圧室２との連通が遮断されると共にシリンダ３内のピストン４上側空気は排気バルブ７から大気に放出され、ピストン４は戻り空気室１３の圧縮空気によって初期位置すなわち上死点に戻る。この際、戻り空気室１３の圧力及び戻り空気室１３と連通している反復バルブ下室１４の圧力が低くなり、反復バルブ上室９の圧力によって反復バルブ１６は下降し、ヘッドバルブ上室８及び第１空気通路１０の圧縮空気は第２空気通路１２、トリガバルブ１１を介して大気に放出される。
ヘッドバルブ上室８の圧力が下がると、再びヘッドバルブ６が上昇し、上記した動作を行う。すなわち、トリガ２７を操作している間はドライバブレード２３は上下動を繰返し、釘を多数回打撃する。
【０００５】
なお、ヘッドバルブ６に設けられた空気通路６ａの通路面積は、第１空気通路１０、第２空気通路１２の通路面積より十分小さく設定されており、ヘッドバルブ６上昇時に空気通路６ａから充填される空気量よりトリガバルブ１１から放出される空気量のほうが多くなっている。
【０００６】
【発明が解決しようとする課題】
上記したような従来の打込機では、ヘッドバルブ６が上昇してから、戻り空気室１３の圧縮空気の一部が反復バルブ下室１４に流入して反復バルブ１６を上昇させるまでの間、蓄圧室２の圧縮空気がヘッドバルブ６に設けられた空気通路６ａから第１空気通路１０及び第２空気通路１２を介して大気に放出されてしまい、圧縮空気の消費量が増加してしまうという欠点があった。
【０００７】
また、特願平７−８２８４７号に示した圧力通路開閉装置を戻り空気室３と反復バルブ下室１４とを連通させる第３空気通路１５内に設けた構成とし、打込み状態を単発とすると、トリガ２７を引いている間は蓄圧室２内の圧縮空気が空気通路６ａを介してヘッドバルブ上室８内に流入し、第１空気通路１０及び第２空気通路１２を介してトリガバルブ１１から大気に放出してしまい、圧縮空気の消費量が大幅に増加してしまうという欠点があった。
【０００８】
本発明の目的は、上記欠点を解決し、圧縮空気の余分な消費を抑えることができる自動反復機能を有した打込機を提供することである。
【０００９】
【課題を解決するための手段】
上記目的は、従来技術で蓄圧室とヘッドバルブ上室とを連通させるためにヘッドバルブに設けていた空気通路を削除し、ヘッドバルブ上室に連通した第１空気通路と反復バルブの摺動面とを連通させる第４空気通路を設けると共に蓄圧室と反復バルブの摺動面とを連通させる第５空気通路を設け、反復バルブが第１空気通路とトリガバルブに連通した第２空気通路との連通を遮断している時には第４空気通路と第５空気通路とを連通させ、第１空気通路と第２空気通路とを連通させている時には第４空気通路と第５空気通路との連通を遮断するＯリング等のシール部材を反復バルブの摺動面に設けることにより達成される。
【００１０】
【実施例】
図１〜図４に本発明打込機の一実施例を示す。
図１を用いて打込機の全体構成を説明する。図示しない圧縮機からの圧縮空気は蓄圧室２内に蓄積されており、本体１内部には円筒状のシリンダ３が設けられ、シリンダ３内には上下に摺動可能で、ドライバブレード２３が取付けられたピストン４が設けられている。ピストン４外周にはピストンリング５が設けられ、シリンダ３とピストン４の間を密閉している。シリンダ３の上端にはヘッドバルブ６が設けられ、ヘッドバルブ６の上昇でシリンダ３上端が開くと共に排気バルブ７が閉じ、ヘッドバルブ６の下降でシリンダ３上端が閉じると共に排気バルブ７が開くようになっている。また、ヘッドバルブ上室８は反復バルブ上室９に第１空気通路１０を介して連通し、反復バルブ上室９とトリガバルブ１１は第２空気通路１２を介して連通している。更に、反復バルブ下室１４は第３空気通路１５を介して戻り空気室１３に連通している。
【００１１】
図に示すようにヘッドバルブ上室８に連通した第１空気通路１０と反復バルブ１６の側面とは第４空気通路１７によって連通されており、蓄圧室２と反復バルブ１６の側面とは第５空気通路１８によって連通されている。
反復バルブ１６には第１空気通路１０と第２空気通路１２との連通を制御するゴム等の可撓性材料から成るバルブラバー１９が圧入されている。また、反復バルブ１６の側面には第５空気通路１８と反復バルブ下室１４とをシールする第１Ｏリング２０が設けられていると共に反復バルブ１６が下降し第１空気通路１０と第２空気通路１２とが連通している時には第４空気通路１７と第５空気通路１８との連通を遮断し、反復バルブが上昇し第１空気通路１０と第２空気通路１２との連通を遮断している時には第４空気通路１７と第５空気通路１８とを連通させる第２Ｏリング３０が設けられている。
【００１２】
一方、シリンダ３には、シリンダ３内と戻り空気室１３とが連通するように、連通穴２１ａと逆止弁２２を備えた連通穴２１ｂが設けられている。
打込機本体１の釘射出部には、ピストン４に取付けられたドライバブレード２３を案内するブレードガイド２４と、釘２５を案内しブレードガイド２４に沿って上下に摺動するネイルガイド２６と、ブレードガイド２４に上下動を案内されると共に下降した時にトリガ２７をロックするプッシュレバー２８が設けられている。
【００１３】
次に、上記した構成の打込機の動作を図１〜図４を用いて説明する。
釘２５をネイルガイド２６内に挿入して、釘先端２５ａを被打込材に押し付け釘頭部２５ｂがプッシュレバー２８を押し上げると、トリガ２７のロックが解除する。トリガ２７を操作すると、図３に示すようにヘッドバルブ上室８内の圧縮空気が第１空気通路１０、第２空気通路１２を介してトリガバルブ１１から大気に放出され、ヘッドバルブ６が上昇し圧縮空気がシリンダ３のピストン４上側へ流入してドライバブレード２３が急激に下降する。ドライバブレード２３は、ピストン下死点まで下降しながらネイルガイド２６内の釘２５を打撃し、釘２５を図示しない被打込材に打込む。
【００１４】
ピストン４及びドライバブレード２３下降時には、シリンダ３内のピストン４下側の空気は連通穴２１ａを介して戻り空気室１３内に流入し、また、ピストン４が連通穴２１ｂを通過すると、シリンダ３のピストン４上側の圧縮空気は連通穴２１ｂから戻り空気室１３内に流入する。戻り空気室１３に流入した圧縮空気は第３空気通路１５を介して反復バルブ下室１４に流入し、反復バルブ１６を上昇させる。反復バルブ１６が上昇すると第２Ｏリング３０も上昇するため、第４空気通路１７と第５空気通路１８とは連通し、蓄圧室２の圧縮空気が第５空気通路１８、第４空気通路１７を介して第１空気通路１０に流入して第１空気通路１０及びヘッドバルブ上室８の圧力を上昇させる。反復バルブ１６は、上部受圧面積が下部受圧面積より小さいため、第１空気通路１０の圧力が上昇したとしても第１空気通路１０と第２空気通路１２との連通を遮断した状態を維持する。
【００１５】
一方、ヘッドバルブ６はヘッドバルブ上室８の圧力上昇と共にヘッドバルブスプリング２９の押圧力で下降し、図４に示すようにシリンダ３内と蓄圧室２との連通を遮断すると共にピストン４上側の圧縮空気を排気バルブ７から大気に放出する。
従って、戻り空気室１３内の圧縮空気によってピストン４が初期位置に復帰する。このため、戻り空気室１３の圧力及び反復バルブ下室１４の圧力が低くなり、反復バルブ上室９の圧力によって反復バルブ１６は下降し、ヘッドバルブ上室８及び第１空気通路１０の圧縮空気は第２空気通路１２、トリガバルブ１１を介して大気に放出される。
第４空気通路１７と第５空気通路１８との連通は、反復バルブ１６が下降したことにより、第２Ｏリング３０によって遮断される。
ヘッドバルブ上室８内の圧縮空気が大気に放出されると、再びヘッドバルブ６が上昇し、上記した打込み動作を行なう。すなわち、トリガ２７を操作している間はピストン４及びドライバブレード２３は上下動を繰返し行い、釘２５を多数回打撃する。
【００１６】
トリガ２７を放すとトリガバルブ１１は図１に示す状態に戻り、蓄圧室２の圧縮空気が第５空気通路１８、第４空気通路１７を介してヘッドバルブ上室８に流入してヘッドバルブ６を下降させ、排気バルブ７を開いてシリンダ３のピストン４上側の圧縮空気を排出するため、ピストン４及びドライバブレード２３は戻り空気室１３に蓄積された圧縮空気により上死点へ復帰し、反復バルブ１６は下降した状態を維持し、反復運動は終了する。
【００１７】
上記したような構成とすることにより、ヘッドバルブ６が上昇してから、戻り空気室１３の圧縮空気が反復バルブ下室１４に流入して反復バルブ１６を上昇させるまでの間に、蓄圧室２の圧縮空気を第１空気通路１０及び第２空気通路１２を介して大気に放出してしまうようなことはなくなる。これは、反復バルブ１６が上昇し、第１空気通路１０と第２空気通路１２との連通を遮断した状態になってから蓄圧室２とヘッドバルブ上室８とを連通させるようにしたためであり、圧縮空気の余分な消費を抑えることができるようになる。
【００１８】
図５に本発明打込機の他の実施例を示す。
本実施例は、前記第４空気通路１７を反復バルブ１６のバルブラバー１９に設け、反復バルブ１６が上昇した状態のときには第４空気通路１７と第５空気通路１８とを連通し、下降した状態のときには第４空気通路１７と第５空気通路１８との連通を遮断するようにしたものである。
上記したような構成の打込機は、図１〜図４に示した打込機と同様の動作を行い、かつ同様の作用効果を得る。なお、本実施例の場合は、図に示すように第２Ｏリング３０は２個必要となる。
【００１９】
図６に本発明打込機の他の実施例を示す。本実施例は図１〜図４に示した打込機の戻り空気室１３と反復バルブ１６とを連通させる第３空気通路１５内に圧力通路開閉装置３３を設けたものである。
図に示す打込機は、圧力通路開閉装置３３の操作子３４が単発位置にあり、第３空気通路１５が遮断された状態で、反復バルブ下室１４は大気と連通している。このため、反復バルブ１６は下降した状態を維持している。
【００２０】
上記したように反復バルブ１６が下降した状態にあるため、第４空気通路１７と第５空気通路１８との連通は第２Ｏリング３０によって遮断されており、蓄圧室２の圧縮空気は第１空気通路１０に流入されない。従って、トリガ２７操作時に蓄圧室２の圧縮空気がトリガバルブ１１を介して大気へ放出されることはなく、圧縮空気を余分に消費することがない。
なお、本実施例では図１〜図４に示した打込機に圧力通路開閉装置３３を設けた構成としたが、図５に示した打込機に圧力通路開閉装置３３を設けた構成としても同様の効果を得ることができる。
【００２１】
【発明の効果】
本発明によれば、反復バルブの上下動によって、ヘッドバルブ上室に連通した第１空気通路とトリガバルブに連通した第２空気通路との連通の制御と、第１空気通路と蓄圧室との連通の制御を行うようにして、第１空気通路と第２空気通路との連通が遮断されている時には第１空気通路と蓄圧室とを連通し、第１空気通路と第２空気通路とが連通している時には第１空気通路と蓄圧室との連通を遮断するようにしたので、ヘッドバルブが上昇してから反復バルブが上昇するまでの間に蓄圧室内の圧縮空気がトリガバルブを介して大気中に放出してしまうことがなくなり、圧縮空気の余分な消費を抑えることができる自動反復機能を有した打込機を提供できるようになる。
【図面の簡単な説明】
【図１】本発明打込機の一実施例を示す要部断面図。
【図２】図１の要部拡大図。
【図３】動作状態を示す図１の要部拡大図。
【図４】動作状態を示す図１の要部拡大図。
【図５】本発明打込機の他の実施例を示す要部拡大断面図。
【図６】本発明打込機の他の実施例を示す要部拡大断面図。
【図７】従来の打込機の一例を示す要部断面図。
【符号の説明】
２は蓄圧室、３はシリンダ、４はピストン、６はヘッドバルブ、８はヘッドバルブ上室、１０は第１空気通路、１１はトリガバルブ、１２は第２空気通路、１３は戻り空気室、１６は反復バルブ、１７は第４空気通路、１８は第５空気通路、２０は第１Ｏリング、３０は第２Ｏリングである。[0001]
[Industrial application fields]
The present invention relates to a driving machine having an automatic repetitive function in which a piston and a driver blade repeatedly move up and down while operating a trigger.
[0002]
[Prior art]
Japanese Patent Publication No. 7-96188 is given as an example of a conventional driving machine having an automatic repeat function, which is shown in FIG.
The driving machine shown in the figure inserts a nail into the nail guide 26, presses the tip of the nail against a not-shown material to be driven, pushes up the push lever 28, unlocks the trigger 27, and then triggers 27 Is operated to open the trigger valve 11 and the driver blade 23 attached to the piston 4 is lowered to drive the nail into the driven material.
As shown in the drawing, the upper chamber 8 of the head valve 6 and the trigger valve 11 are communicated with each other by a first air passage 10 and a second air passage 12, and between the first air passage 10 and the second air passage 12. Is provided with a repetitive valve 16, and communication between the first air passage 10 and the second air passage 12 is controlled by the repetitive valve 16. The second air passage 12 communicates with the atmosphere when the trigger valve 11 is opened.
[0003]
Hereinafter, the driving operation of the driving machine shown in the drawing will be described in detail.
When the trigger 27 is opened by operating the trigger 27, the compressed air in the head valve upper chamber 8 is released to the atmosphere via the first air passage 10 and the second air passage 12. For this reason, the head valve 6 is raised, the compressed air in the pressure accumulating chamber 2 flows into the cylinder 3, the piston 4 and the driver blade 23 are rapidly lowered, and the nail inserted in the nail guide 26 is driven. Drive into the material.
When the piston 4 is lowered, the air below the piston 4 flows into the return air chamber 13 through the communication hole 21 a provided below the cylinder 3. Further, when the piston 4 passes through the communication hole 21 b provided with the check valve 22, the compressed air on the upper side of the piston 4 of the cylinder 3 returns to the return air chamber 13 from the communication hole 21 b.
The compressed air that has flowed into the return air chamber 13 reaches the repetitive valve lower chamber 14 via the third air passage 15 and raises the repetitive valve 16, thereby blocking communication between the first air passage 10 and the second air passage 12. To do.
[0004]
When the head valve 6 is raised, the head valve upper chamber 8 and the pressure accumulating chamber 2 communicate with each other via an air passage 6a provided in the head valve 6, so that the compressed air in the pressure accumulating chamber 2 is transferred to the head valve upper chamber. 8, the pressure in the head valve upper chamber 8 and the first air passage 10 rises. The repetitive valve 16 does not descend because the upper pressure receiving area is smaller than the lower pressure receiving area, and maintains the state where the communication between the first air passage 10 and the second air passage 12 is blocked. On the other hand, the head valve 6 is lowered by the pressing force of the head valve spring 29 as the pressure of the head valve upper chamber 8 is increased, the communication between the cylinder 3 and the pressure accumulating chamber 2 is cut off, and the air above the piston 4 in the cylinder 3 is exhausted. The air is discharged from the valve 7 to the atmosphere, and the piston 4 returns to the initial position, that is, the top dead center by the compressed air in the return air chamber 13. At this time, the pressure of the return air chamber 13 and the pressure of the repetitive valve lower chamber 14 communicating with the return air chamber 13 are lowered, the repetitive valve 16 is lowered by the pressure of the repetitive valve upper chamber 9, and the head valve upper chamber 8. The compressed air in the first air passage 10 is released to the atmosphere through the second air passage 12 and the trigger valve 11.
When the pressure in the head valve upper chamber 8 decreases, the head valve 6 rises again and performs the above-described operation. That is, while operating the trigger 27, the driver blade 23 repeats up and down movement and strikes the nail many times.
[0005]
The passage area of the air passage 6a provided in the head valve 6 is set to be sufficiently smaller than the passage areas of the first air passage 10 and the second air passage 12, and is filled from the air passage 6a when the head valve 6 is raised. The amount of air released from the trigger valve 11 is larger than the amount of air that is generated.
[0006]
[Problems to be solved by the invention]
In the conventional driving machine as described above, after the head valve 6 is raised, until a part of the compressed air in the return air chamber 13 flows into the repetitive valve lower chamber 14 and raises the repetitive valve 16. The compressed air in the pressure accumulating chamber 2 is released from the air passage 6a provided in the head valve 6 to the atmosphere through the first air passage 10 and the second air passage 12, and the consumption of compressed air increases. There were drawbacks.
[0007]
Further, when the pressure passage opening and closing device shown in Japanese Patent Application No. 7-82847 is provided in the third air passage 15 for communicating the return air chamber 3 and the repetitive valve lower chamber 14, and the driving state is single-shot, While pulling the trigger 27, the compressed air in the pressure accumulating chamber 2 flows into the head valve upper chamber 8 through the air passage 6a, and from the trigger valve 11 through the first air passage 10 and the second air passage 12. There is a drawback that the amount of compressed air consumed is greatly increased due to release to the atmosphere.
[0008]
An object of the present invention is to provide a driving machine having an automatic repeating function that can solve the above-mentioned drawbacks and suppress excessive consumption of compressed air.
[0009]
[Means for Solving the Problems]
The purpose is to eliminate the air passage provided in the head valve in order to connect the pressure accumulating chamber and the head valve upper chamber in the prior art, and to slide the first air passage communicating with the head valve upper chamber and the repetitive valve. And a fifth air passage that communicates the pressure accumulating chamber and the sliding surface of the repetitive valve, and the repetitive valve communicates with the first air passage and the second air passage that communicates with the trigger valve. When the communication is interrupted, the fourth air passage and the fifth air passage are communicated. When the first air passage and the second air passage are communicated, the communication between the fourth air passage and the fifth air passage is established. This is achieved by providing a sealing member such as an O-ring for blocking on the sliding surface of the repetitive valve.
[0010]
【Example】
1 to 4 show an embodiment of the driving machine of the present invention.
The overall configuration of the driving machine will be described with reference to FIG. Compressed air from a compressor (not shown) is accumulated in the pressure accumulating chamber 2, and a cylindrical cylinder 3 is provided inside the main body 1. The cylinder 3 can be slid up and down, and a driver blade 23 is attached. A piston 4 is provided. A piston ring 5 is provided on the outer periphery of the piston 4 to seal between the cylinder 3 and the piston 4. A head valve 6 is provided at the upper end of the cylinder 3. When the head valve 6 is raised, the upper end of the cylinder 3 is opened and the exhaust valve 7 is closed. When the head valve 6 is lowered, the upper end of the cylinder 3 is closed and the exhaust valve 7 is opened. It has become. The head valve upper chamber 8 communicates with the repetitive valve upper chamber 9 via the first air passage 10, and the repetitive valve upper chamber 9 and the trigger valve 11 communicate with each other via the second air passage 12. Further, the repetitive valve lower chamber 14 communicates with the return air chamber 13 through the third air passage 15.
[0011]
As shown in the drawing, the first air passage 10 communicated with the head valve upper chamber 8 and the side surface of the repetitive valve 16 are communicated with each other by a fourth air passage 17, and the pressure accumulating chamber 2 and the side surface of the repetitive valve 16 are fifth. The air passage 18 communicates.
A valve rubber 19 made of a flexible material such as rubber that controls communication between the first air passage 10 and the second air passage 12 is press-fitted into the repetitive valve 16. A side surface of the repetitive valve 16 is provided with a first O-ring 20 that seals the fifth air passage 18 and the repetitive valve lower chamber 14, and the repetitive valve 16 descends so as to lower the first air passage 10 and the second air passage. When communication with the air passage 12 is established, the communication between the fourth air passage 17 and the fifth air passage 18 is cut off, and the repetitive valve is raised to cut off the communication between the first air passage 10 and the second air passage 12. Sometimes, a second O-ring 30 is provided for communicating the fourth air passage 17 and the fifth air passage 18.
[0012]
On the other hand, the cylinder 3 is provided with a communication hole 21 b provided with a communication hole 21 a and a check valve 22 so that the inside of the cylinder 3 and the return air chamber 13 communicate with each other.
In the nail injection portion of the driving machine main body 1, a blade guide 24 that guides a driver blade 23 attached to the piston 4, a nail guide 26 that guides the nail 25 and slides up and down along the blade guide 24, A push lever 28 that locks the trigger 27 when the blade guide 24 is guided to move up and down and is lowered is provided.
[0013]
Next, the operation of the driving machine configured as described above will be described with reference to FIGS.
When the nail 25 is inserted into the nail guide 26 and the nail tip 25a is pressed against the material to be driven and the nail head portion 25b pushes up the push lever 28, the trigger 27 is unlocked. When the trigger 27 is operated, the compressed air in the head valve upper chamber 8 is released from the trigger valve 11 to the atmosphere via the first air passage 10 and the second air passage 12 as shown in FIG. Then, the compressed air flows into the upper side of the piston 4 of the cylinder 3 and the driver blade 23 is rapidly lowered. The driver blade 23 hits the nail 25 in the nail guide 26 while descending to the bottom dead center of the piston, and drives the nail 25 into a workpiece to be driven (not shown).
[0014]
When the piston 4 and the driver blade 23 are lowered, the air below the piston 4 in the cylinder 3 flows into the return air chamber 13 through the communication hole 21a, and when the piston 4 passes through the communication hole 21b, The compressed air on the upper side of the piston 4 returns to the return air chamber 13 from the communication hole 21b. The compressed air flowing into the return air chamber 13 flows into the repetitive valve lower chamber 14 through the third air passage 15 and raises the repetitive valve 16. When the repetitive valve 16 is raised, the second O-ring 30 is also raised, so that the fourth air passage 17 and the fifth air passage 18 communicate with each other, and the compressed air in the pressure accumulating chamber 2 passes through the fifth air passage 18 and the fourth air passage 17. And flows into the first air passage 10 to increase the pressure of the first air passage 10 and the head valve upper chamber 8. Since the upper pressure receiving area is smaller than the lower pressure receiving area, the repetitive valve 16 maintains the state where the communication between the first air passage 10 and the second air passage 12 is cut off even if the pressure of the first air passage 10 increases.
[0015]
On the other hand, the head valve 6 is lowered by the pressing force of the head valve spring 29 as the pressure of the head valve upper chamber 8 is increased, and as shown in FIG. 4, the communication between the cylinder 3 and the pressure accumulating chamber 2 is blocked and the upper side of the piston 4 is Compressed air is discharged from the exhaust valve 7 to the atmosphere.
Therefore, the piston 4 is returned to the initial position by the compressed air in the return air chamber 13. For this reason, the pressure of the return air chamber 13 and the pressure of the repetitive valve lower chamber 14 are lowered, the repetitive valve 16 is lowered by the pressure of the repetitive valve upper chamber 9, and the compressed air in the head valve upper chamber 8 and the first air passage 10 is lowered. Is released to the atmosphere via the second air passage 12 and the trigger valve 11.
Communication between the fourth air passage 17 and the fifth air passage 18 is blocked by the second O-ring 30 when the repetitive valve 16 is lowered.
When the compressed air in the head valve upper chamber 8 is released to the atmosphere, the head valve 6 rises again and performs the driving operation described above. That is, while the trigger 27 is being operated, the piston 4 and the driver blade 23 repeatedly move up and down to strike the nail 25 many times.
[0016]
When the trigger 27 is released, the trigger valve 11 returns to the state shown in FIG. 1, and the compressed air in the pressure accumulating chamber 2 flows into the head valve upper chamber 8 via the fifth air passage 18 and the fourth air passage 17, and the head valve 6. And the exhaust valve 7 is opened to discharge the compressed air on the upper side of the piston 4 of the cylinder 3, so that the piston 4 and the driver blade 23 return to the top dead center by the compressed air accumulated in the return air chamber 13. The valve 16 remains in the lowered state, and the repetitive motion ends.
[0017]
With the above-described configuration, the pressure accumulating chamber 2 is from the time when the head valve 6 is raised until the compressed air in the return air chamber 13 flows into the repetitive valve lower chamber 14 and raises the repetitive valve 16. The compressed air is not released to the atmosphere via the first air passage 10 and the second air passage 12. This is because the pressure accumulation chamber 2 and the head valve upper chamber 8 are made to communicate after the repetitive valve 16 is raised and the communication between the first air passage 10 and the second air passage 12 is cut off. It will be possible to suppress excessive consumption of compressed air.
[0018]
FIG. 5 shows another embodiment of the driving machine of the present invention.
In this embodiment, the fourth air passage 17 is provided in the valve rubber 19 of the repetitive valve 16, and when the repetitive valve 16 is in the raised state, the fourth air passage 17 and the fifth air passage 18 are communicated and lowered. In this case, the communication between the fourth air passage 17 and the fifth air passage 18 is blocked.
The driving machine having the above-described configuration performs the same operation as that of the driving machine shown in FIGS. In this embodiment, two second O-rings 30 are required as shown in the figure.
[0019]
FIG. 6 shows another embodiment of the driving machine of the present invention. In this embodiment, a pressure passage opening / closing device 33 is provided in a third air passage 15 for communicating the return air chamber 13 and the repetitive valve 16 of the driving machine shown in FIGS.
In the driving machine shown in the figure, the repetitive valve lower chamber 14 is in communication with the atmosphere with the operating element 34 of the pressure passage opening / closing device 33 in the single-shot position and the third air passage 15 being blocked. For this reason, the repetitive valve 16 maintains the lowered state.
[0020]
Since the repetitive valve 16 is in the lowered state as described above, the communication between the fourth air passage 17 and the fifth air passage 18 is blocked by the second O-ring 30, and the compressed air in the pressure accumulating chamber 2 is the first air. It does not flow into the passage 10. Therefore, the compressed air in the pressure accumulating chamber 2 is not released to the atmosphere via the trigger valve 11 when the trigger 27 is operated, and the compressed air is not consumed excessively.
In this embodiment, the pressure passage opening / closing device 33 is provided in the driving machine shown in FIGS. 1 to 4, but the pressure passage opening / closing device 33 is provided in the driving machine shown in FIG. The same effect can be obtained.
[0021]
【The invention's effect】
According to the present invention, by the vertical movement of the repetitive valve, the control of the communication between the first air passage communicating with the head valve upper chamber and the second air passage communicating with the trigger valve, and the first air passage and the pressure accumulation chamber When the communication between the first air passage and the second air passage is interrupted so that the communication is controlled, the first air passage and the pressure accumulating chamber are communicated, and the first air passage and the second air passage are Since the communication between the first air passage and the pressure accumulating chamber is cut off when communicating, the compressed air in the pressure accumulating chamber passes through the trigger valve between the time when the head valve rises and the time when the repetitive valve rises. It becomes possible to provide a driving machine having an automatic repeat function that can suppress excessive consumption of compressed air without being released into the atmosphere.
[Brief description of the drawings]
FIG. 1 is a sectional view of an essential part showing an embodiment of a driving machine of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1 showing an operation state.
4 is an enlarged view of a main part of FIG. 1 showing an operating state.
FIG. 5 is an enlarged cross-sectional view of a main part showing another embodiment of the driving machine of the present invention.
FIG. 6 is an enlarged cross-sectional view of a main part showing another embodiment of the driving machine of the present invention.
FIG. 7 is a cross-sectional view of an essential part showing an example of a conventional driving machine.
[Explanation of symbols]
2 is a pressure accumulation chamber, 3 is a cylinder, 4 is a piston, 6 is a head valve, 8 is a head valve upper chamber, 10 is a first air passage, 11 is a trigger valve, 12 is a second air passage, 13 is a return air chamber, 16 is a repetitive valve, 17 is a fourth air passage, 18 is a fifth air passage, 20 is a first O-ring, and 30 is a second O-ring.

Claims

A pressure accumulating chamber for storing compressed air, a piston provided in a cylindrical cylinder so as to be movable up and down, a driver blade attached to the piston for driving a stopper, opening and closing of the upper end of the cylinder, and an exhaust valve on the upper side of the piston A head valve that opens and closes, a first air passage that communicates with the upper chamber of the head valve, a first air passage that communicates with the first air passage via the repetitive valve upper chamber, and a first valve that communicates with the trigger valve whose opening and closing is controlled by the operation of the trigger. 2 and the air passage, communicating through an iterative valve communicating or blocking the first air passage and the second air passage, the third air passage to repeat the valve lower chamber causes return to the top dead center of the lowered piston and driver blade in driving machine having an automatic repeat function and a return air chamber to,
A fourth air passage is provided for communicating the sliding surface of the repetitive valve and the first air passage, a fifth air passage is provided for communicating the sliding surface of the repetitive valve and the pressure accumulating chamber, and the repetitive valve is the first air. When the communication between the passage and the second air passage is blocked, the fourth air passage and the fifth air passage are communicated, and when the first air passage and the second air passage are communicated, the fourth air passage and A driving machine characterized in that a seal member for blocking communication with the fifth air passage is provided on a sliding surface of the repetitive valve.