JPH02243228A - Automatic screw fastening device - Google Patents
Automatic screw fastening deviceInfo
- Publication number
- JPH02243228A JPH02243228A JP6225489A JP6225489A JPH02243228A JP H02243228 A JPH02243228 A JP H02243228A JP 6225489 A JP6225489 A JP 6225489A JP 6225489 A JP6225489 A JP 6225489A JP H02243228 A JPH02243228 A JP H02243228A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- sleeve
- gap
- bit
- air
- 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.)
- Pending
Links
- 125000006850 spacer group Chemical group 0.000 claims abstract description 15
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Landscapes
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
電動ドライバあるいはエアドライバ等の回転工具を用い
た自動ねじ締め装置に関し、
ねじをビットに短時間で安定してセットすることができ
、しかもねじ締め時にねじ頭部の溝を損傷しないように
することを目的とし、
ねじを保持するとともに、該ねじの頭部を吹き上げる圧
縮空気を通過させる吹き出し口を備えたねじ供給部と、
ビットを回転可能に保持するとと。[Detailed Description of the Invention] [Summary] This invention relates to an automatic screw tightening device using a rotating tool such as an electric screwdriver or an air driver, which can stably set a screw in a bit in a short time, and also prevents screws from tightening when tightening the screw. a screw feeder equipped with an air outlet that holds the screw and allows compressed air to blow up the head of the screw to pass through, the purpose of which is to avoid damaging the groove in the head;
Holds the bit rotatably.
もに、吸着部及び上下動可能なスリーブを備え、ねじセ
ット時に、前記ねじ供給部から吹き上げられるねじを前
記ねじ供給部に当接する前記スリーブを介し前記吸着部
に吸引して前記ビットにセットさせる回転工具とより成
る自動ねじ締め装置において、前記スリーブまたは前記
ねじ供給部のいずれか一方に、ねじセット時に該両部材
間に間隙を形成するためのスペーサを設けた構成とする
。The screw is also provided with a suction part and a vertically movable sleeve, and when setting the screw, the screw blown up from the screw supply part is sucked into the suction part through the sleeve that abuts the screw supply part, and is set in the bit. In the automatic screw tightening device comprising a rotary tool, either the sleeve or the screw supply section is provided with a spacer for forming a gap between the two members during screw setting.
本発明は電動ドライバあるいはエアードライバ等の回転
工具を用いた自動ねじ締め装置に関する。The present invention relates to an automatic screw tightening device using a rotating tool such as an electric screwdriver or an air screwdriver.
ファクトリ−・オートメーションの進展に伴い、各種の
作業がロボット化されつつあり、比較的高度とされる機
械部品の組立作業もロボ7)で行われるようになってき
た。ロボットによる組立作業においては、一方の部品上
の所定位置に他方の部品を設置する作業の他に、ねじ締
結によって機械部品を他の部品や装置に固定するねじ締
め作業がある。ねじ締め作業は、回転工具を備えた専用
のねじ締め機あるいは回転工具を備えたロボットで行わ
れ、回転工具へのねじの供給はねじ供給機から自動的に
行われる。With the progress of factory automation, various types of work are being performed by robots, and relatively sophisticated assembly work of mechanical parts is also being performed by robots7). In assembly work performed by robots, in addition to work in which one part is installed at a predetermined position on the other, there is also work in which mechanical parts are fastened to other parts or devices by screw tightening. The screw tightening work is performed by a dedicated screw tightening machine equipped with a rotary tool or a robot equipped with a rotary tool, and screws are automatically supplied to the rotary tool from a screw feeder.
第4図は従来の自動ねじ締め装置の構造を示す正面図で
、図中、1は回転工具、2はねじ供給機である。FIG. 4 is a front view showing the structure of a conventional automatic screw tightening device, in which 1 is a rotary tool and 2 is a screw feeder.
回転工具1は、X+3’+2方向に移動可能なロボット
のアーム3に支持され、モータ4と、トルク調整部5と
、吸着部6とを備えるとともに、ビット7を回転可能に
保持している。吸着部6は、真空ポンプ8に吸着用電磁
弁9を介し接続され、電磁弁9はコントローラ10によ
り制御される。The rotary tool 1 is supported by a robot arm 3 movable in the X+3'+2 direction, and includes a motor 4, a torque adjustment section 5, and a suction section 6, and rotatably holds a bit 7. The suction unit 6 is connected to a vacuum pump 8 via a suction solenoid valve 9, and the solenoid valve 9 is controlled by a controller 10.
吸着部6内にはスリーブ11が上下動自在に支持され、
該スリーブ11は、スプリング12により下方に状勢さ
れて図示の状態に係止されている。A sleeve 11 is supported within the adsorption section 6 so as to be movable up and down.
The sleeve 11 is urged downward by a spring 12 and is locked in the illustrated state.
スリーブ11は、ねじ100の頭部外径よりわずかに大
きい内径を有している。また、スリーブ11の下部には
、ねじ100の吸着の有無を判定(スリーブ11の側面
から光のビームをビット7のやや下方に照射して判定)
する光電センサ13が設けられている。光電センサ13
は、光を照射し反射光を受光するセンサヘッド131
と、発光素子、受光素子を内蔵し反射光の強弱を電気信
号に変換するアンプ13□と、センサヘッド13゜とア
ンプ13□を接続する光ファイバ13.で構成される。The sleeve 11 has an inner diameter slightly larger than the outer diameter of the head of the screw 100. In addition, the lower part of the sleeve 11 determines whether or not the screw 100 is attracted (determined by irradiating a light beam slightly below the bit 7 from the side of the sleeve 11).
A photoelectric sensor 13 is provided. Photoelectric sensor 13
is a sensor head 131 that emits light and receives reflected light.
, an amplifier 13□ that has a built-in light-emitting element and a light-receiving element and converts the intensity of reflected light into an electrical signal, and an optical fiber 13 that connects the sensor head 13° and the amplifier 13□. Consists of.
ねじ供給機2は、第5図に示すように、図示しないパー
ツフィーダより連続供給されてシュート14を落下する
1個のねじ100保持用の穴15を有するねじ供給部1
6を備えている。ねじ供給部16は、コンプレッサ17
に吹上用電磁弁18を介し連絡する空気流路19と、該
空気流路19に連通ずる吹き出し口20を備え、矢印A
、B方向に移動可能である。穴15によるねじ100の
分離、保持は、ねじ供給部16を第5図の状態から矢印
A方向に移動させることにより行われ、後述のねじセン
トはこの状態で行われる。吹き出し口20は、穴15に
保持されるねじ100の頭部101の裏側に対向する位
置に配置されている。As shown in FIG. 5, the screw feeder 2 includes a screw feeder 1 having a hole 15 for holding one screw 100 that is continuously fed from a parts feeder (not shown) and falls down a chute 14.
It is equipped with 6. The screw supply section 16 is connected to the compressor 17
An air flow path 19 communicating with the blow-up electromagnetic valve 18 and an air outlet 20 communicating with the air flow path 19 are provided.
, can move in the B direction. The screw 100 is separated and held by the hole 15 by moving the screw supply section 16 in the direction of arrow A from the state shown in FIG. 5, and the screw centration described later is performed in this state. The air outlet 20 is arranged at a position facing the back side of the head 101 of the screw 100 held in the hole 15.
電磁弁18はコントローラ10により制御される。The solenoid valve 18 is controlled by the controller 10.
ビット7に対するねじ100のセットは次の手順で行わ
れる。The screw 100 is set in the bit 7 in the following steps.
ねじセットに際しては、回転工具1をアーム3により移
動させてスリーブ1fを穴15に対向する位置でねじ供
給部16に当接させる。この状態では、穴15内に保持
されるねじ100の頭部101はスリーブ11内に微小
間隙を介し位置している。この状態で、コントローラ1
0により電磁弁9,18をオンにして真空ポンプ8及び
コンプレッサ17を作動させると、吸着部6がねじ10
0を吸引してビット7にセットする(ねじ頭部101の
十字溝をビットに係合させる)が、このとき、コンプレ
ッサ17がら空気流路19に供給される圧縮空気が吹き
出し口20から吹き出してねじ頭部101を吹き上げて
セットを確実にする。このねじセットの完了は、光電セ
ンサ13により確認することができる。このねじ頭部1
01の吹き上げは、本出願人により昭和63年8月20
日に出願された特願昭63−206764号に開示され
たものである。ところで、ねじ吸着七ット時に、ねじ頭
部101の溝がビット7に完全に係合していないと、次
に回転工具1をねじ締め場所まで移動させてねじ締め作
業を行うときに、第6図に示すようにねじ頭部101の
溝102の斜線記入部分に傷がつくことがある。この傷
の大きさは、M3プラスねじの場合0.1〜0.3 t
m程度と小さく、肉眼ではほとんど分からない。しかし
、磁気ディスク装置のように極度に塵埃をきらう精密機
械の場合、この傷により生じた金属破片が装置内にある
と、ヘッドクラッシュ等の重大障害を引き起こすおそれ
がある。上述のねじ頭部101の吹き上げを行うことに
よってこの問題は解決される。When setting the screws, the rotary tool 1 is moved by the arm 3 to bring the sleeve 1f into contact with the screw supply section 16 at a position facing the hole 15. In this state, the head 101 of the screw 100 held in the hole 15 is located within the sleeve 11 with a small gap therebetween. In this state, controller 1
When the solenoid valves 9 and 18 are turned on and the vacuum pump 8 and compressor 17 are operated by
0 is suctioned and set in the bit 7 (the cross groove of the screw head 101 is engaged with the bit), but at this time, the compressed air supplied to the air passage 19 from the compressor 17 is blown out from the air outlet 20. The screw head 101 is blown up to ensure setting. Completion of this screw setting can be confirmed by the photoelectric sensor 13. This screw head 1
01 was made by the applicant on August 20, 1988.
This was disclosed in Japanese Patent Application No. 63-206764 filed in 1983. By the way, if the groove of the screw head 101 is not completely engaged with the bit 7 when the screw is suctioned at 7 bits, the next time the rotary tool 1 is moved to the screw tightening place and the screw tightening operation is performed, As shown in FIG. 6, the hatched portion of the groove 102 of the screw head 101 may be scratched. The size of this scratch is 0.1 to 0.3 t for M3 Phillips screws.
It is so small that it is almost invisible to the naked eye. However, in the case of a precision machine such as a magnetic disk drive, which is extremely sensitive to dust, if metal fragments generated by this scratch are inside the machine, there is a risk of serious trouble such as a head crash. This problem is solved by blowing up the screw head 101 as described above.
(発明が解決しようとする課題〕
ところで、ねじ頭部101の直径にはばらつきがあるの
で、ねじ100を確実にスリーブ内に吸引してセントで
きるように、スリーブ11の内径はねじ頭部101の外
径よりわずかに太きく <M3プラスねじで0,5鶴
程度)しである。これにより、第7図に示すように、ね
じ吸着中はねじ頭部101とスリーブ11の隙間から空
気が絶えず吸着部6内に流れ込んでいる。吸着時の吸着
力を高めるためには、スリーブ11とねじ頭部101の
隙間以外から余計な空気が吸着部6内に流れ込まないこ
とが重要で、吸着部6と回転工具1の間。(Problem to be Solved by the Invention) By the way, since there are variations in the diameter of the screw head 101, the inner diameter of the sleeve 11 should be adjusted to the diameter of the screw head 101 so that the screw 100 can be reliably sucked into the sleeve. It is slightly thicker than the outer diameter (about 0.5 mm with an M3 Phillips screw). As a result, as shown in FIG. 7, air constantly flows into the suction section 6 from the gap between the screw head 101 and the sleeve 11 during screw suction. In order to increase the suction force during suction, it is important that unnecessary air does not flow into the suction part 6 from other than the gap between the sleeve 11 and the screw head 101, and between the suction part 6 and the rotary tool 1.
及び吸着部6とスリーブ11の間は隙間をできるだけ小
さくして空気の洩れを減らすようにしている。この構造
のため、ねじ吹き上げ時に次の問題点が生じた。The gap between the suction part 6 and the sleeve 11 is made as small as possible to reduce air leakage. Due to this structure, the following problems arose when the screw was blown up.
すなわち、第8図に示すように、吹き出し口20から吹
き出す圧縮空気はねじ頭部101を押し上げ、この空気
はねじ頭部101とスリーブ11の隙間を通って吸着部
6にたまり始める。たまった空気はねじ頭部101を下
へ押すように作用する。その結果、ねじ100はビット
7に接触する位置で上下に激しく振動し、ねじ頭部10
1の溝102がビット7に係合しなくなる。吸着部6の
気密を高める程空気の逃げ場所がなくなるため、ねじ1
00の振動は大となる。That is, as shown in FIG. 8, the compressed air blown from the air outlet 20 pushes up the screw head 101, and this air passes through the gap between the screw head 101 and the sleeve 11 and begins to accumulate in the suction part 6. The accumulated air acts to push the screw head 101 downward. As a result, the screw 100 vibrates violently up and down at the position where it contacts the bit 7, and the screw head 10
The groove 102 of No. 1 no longer engages with the bit 7. As the airtightness of the suction part 6 increases, there is no place for air to escape, so the screw 1
The vibration of 00 is large.
本発明は、ねじをビットに短時間で安定してセットする
ことができ、しかもねじ締め時にねじ頭部を損傷するこ
とのない自動ねじ締め装置を提供”することを目的とし
ている。SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic screw tightening device that can stably set a screw in a bit in a short time and does not damage the screw head during screw tightening.
第1図は本発明の原理説明図で、従来と同様の部材は回
付号で表わしている。図中、31はスペーサである。FIG. 1 is an explanatory diagram of the principle of the present invention, in which members similar to the conventional ones are indicated by reference numbers. In the figure, 31 is a spacer.
スペーサ31は、ねじ100の吸引、セット時にスリー
ブエ1とねじ供給部16の間に所定の間隙32を形成す
るためのもので、スリーブ11またはねじ供給部16の
いずれか一方に設けられている。本図では、複数個のス
ペーサ31がスリーブ11の下端に突設された例を示し
ている。The spacer 31 is provided on either the sleeve 11 or the screw supply section 16 to form a predetermined gap 32 between the sleeve 1 and the screw supply section 16 when the screw 100 is sucked and set. This figure shows an example in which a plurality of spacers 31 are provided protruding from the lower end of the sleeve 11.
ねじ100をビット7にセットする際にスペーサ11を
ねじ供給部16に当接させると、スペーサ31の存在に
より、スリーブ11とねじ供給部16の間には間隙32
が形成される。When the spacer 11 is brought into contact with the screw supply section 16 when setting the screw 100 in the bit 7, a gap 32 is created between the sleeve 11 and the screw supply section 16 due to the presence of the spacer 31.
is formed.
この状態でねじlOOのセントを開始すると、吹き出し
口20から吹き出す空気は、ねじ頭部101を吹き上げ
るだけでなく、一部は間隙32から外部に流出する。こ
の場合、間隙32の流出面積をねじ頭部101とスリー
ブ11の隙間より大きくとれば、空気は抵抗の小さい間
隙31に多く流れるようになる。また、間隙32は吹き
出し口20に近い位置にあるため、さらに多くの空気が
間隙32から流出する。When the screw lOO starts to be centered in this state, the air blown out from the air outlet 20 not only blows up the screw head 101, but also partially flows out through the gap 32 to the outside. In this case, if the outflow area of the gap 32 is made larger than the gap between the screw head 101 and the sleeve 11, more air will flow through the gap 31 where the resistance is lower. Further, since the gap 32 is located close to the air outlet 20, even more air flows out from the gap 32.
従って、吸着部6へ流れ込む空気量は減少してねじ10
0は振動しなくなり、該ねじ100を確実かつ速かにビ
ット7に係合させてセットすることが可能になる。その
結果、その後ねじ締めを行う際のねじ頭部損傷を防止す
ることができる。Therefore, the amount of air flowing into the suction part 6 is reduced and the screw 10
0 does not vibrate, making it possible to engage and set the screw 100 with the bit 7 reliably and quickly. As a result, damage to the screw head during subsequent screw tightening can be prevented.
以下、第2図及び第3図に関連して本発明の詳細な説明
する。The present invention will now be described in detail with reference to FIGS. 2 and 3.
第2図に第1の実施例を示す。FIG. 2 shows a first embodiment.
第2図は本例の自動ねじ締め装置の要部構造を示す斜視
図で、スリーブ11の先端には、第1図に示したスペー
サ31が一体に突設されている。FIG. 2 is a perspective view showing the main structure of the automatic screw tightening device of this example, and the spacer 31 shown in FIG. 1 is integrally provided at the tip of the sleeve 11 in a protruding manner.
その他の構成は第4図と同様である。The other configurations are the same as in FIG. 4.
このスペーサ31を設けることによって、第1図に関連
して説明したように、吹き出し口2oがら吹き出す空気
の一部はスペーサ31により形成される間隙32から外
部に流出し、吸着部6へ流れ込む空気量は減少する。従
って、従来問題となっていたセット時におけるねじ1o
oの振動はなくなり、該ねじ100を確実がっ速かにビ
ット7に係合させてセットすることが可能となる。また
、その後ねじ締めを行う際のねじ頭部101の損傷を防
止することができる。By providing this spacer 31, as explained in connection with FIG. quantity decreases. Therefore, when setting the screw, which was a problem in the past,
o vibration is eliminated, and the screw 100 can be reliably and quickly engaged with the bit 7 and set. Further, it is possible to prevent damage to the screw head 101 when tightening the screw afterwards.
第3図に第2の実施例を示す。FIG. 3 shows a second embodiment.
第3図は本例の自動ねじ締め装置の要部構造を示す斜視
図で、図中、41はスリーブ11の先端と当接するよう
にねじ供給部16上に配置されたスペーサである。FIG. 3 is a perspective view showing the main structure of the automatic screw tightening device of this example. In the figure, 41 is a spacer placed on the screw supply section 16 so as to come into contact with the tip of the sleeve 11.
本例の場合も、吹き出し口20から吹き出す空気の一部
は、スペーサ41の存在により形成されるスペーサ11
とねじ供給部16の間隙から外部に流出し、前例と同様
の効果が得られる。In the case of this example as well, a part of the air blown out from the air outlet 20 flows through the spacer 11 formed by the spacer 41.
It flows out from the gap between the screw supply section 16 and the screw supply section 16, and the same effect as in the previous example can be obtained.
以上述べたように、本発明によれば、圧縮空気で吹き上
げられたねじは振動しないでビットと係合してセットさ
れるので、ビットへのねじセットを確実かつ速かに行う
ことができ、自動ねじ締めの効率向上を実現することが
可能である。また、その後のねじ締めを行う際のねじ頭
部の損傷を防止することができる。As described above, according to the present invention, the screw blown up by compressed air is set by engaging with the bit without vibration, so that the screw can be set into the bit reliably and quickly. It is possible to improve the efficiency of automatic screw tightening. Further, damage to the screw head during subsequent screw tightening can be prevented.
第1図は本発明の原理説明図、
第2図は本発明の第1の実施例の自動ねじ締め装置の要
部構造を示す斜視図、
第3図は本発明の第2の実施例の自動ねじ締め装置の要
部構造を示す斜視図、
第4図は従来の自動ねじ締め装置の構造を示す正面図、
第5図は従来のねじ供給機の要部構造を示す斜視図、
第6図はねじ頭部の溝形状説明図、
第7図は従来の自動ねじ締め装置の要部の作用説明図、
第8図は従来の自動ねじ締め装置の問題点説明図で、
図中、
1は回転工具、
7はビット、
11はスリーブ、
16はねじ供給部、
20は吹き出し口、
31.41はスペーサ、
32は間隙である。
本発明の原理説明図
第1図
第3図
第4図
第6図
第5図
従来の自動ねじ締め!J置の要部の作用説明図第7図
第8図Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a perspective view showing the main structure of an automatic screw tightening device according to the first embodiment of the present invention, and Fig. 3 is a diagram illustrating the principal structure of the automatic screw tightening device according to the first embodiment of the present invention. FIG. 4 is a front view showing the structure of a conventional automatic screw tightening device; FIG. 5 is a perspective view showing the structure of a conventional screw feeder; Figure 7 is an explanatory diagram of the groove shape of the screw head, Figure 7 is an explanatory diagram of the operation of the main parts of a conventional automatic screw tightening device, and Figure 8 is an explanatory diagram of problems with the conventional automatic screw tightening device. 7 is a rotating tool, 7 is a bit, 11 is a sleeve, 16 is a screw supply part, 20 is an outlet, 31.41 is a spacer, and 32 is a gap. Illustration of the principle of the present invention: Figure 1, Figure 3, Figure 4, Figure 6, Figure 5. Conventional automatic screw tightening! Figure 7 Figure 8
Claims (1)
縮空気を通過させる吹き出し口(20)を備えたねじ供
給部(16)と、 ビット(7)を回転可能に保持するとともに、吸着部(
6)及び上下動可能なスリーブ(11)を備え、ねじセ
ット時に、前記ねじ供給部(16)から吹き上げられる
ねじを前記ねじ供給部(16)に当接する前記スリーブ
(11)を介し前記吸着部(6)に吸引して前記ビット
(7)にセットさせる回転工具(1)とより成る自動ね
じ締め装置において、 前記スリーブ(11)または前記ねじ供給部(16)の
いずれか一方に、ねじセット時に該スリーブ(11)と
該ねじ供給部(16)の間に間隙(32)を形成するた
めのスペーサ(31)を設けたことを特徴とする自動ね
じ締め装置。[Claims] A screw supply unit (16) that holds a screw and is equipped with an air outlet (20) through which compressed air blows up the head of the screw, and that rotatably holds a bit (7). In addition, the suction part (
6) and a vertically movable sleeve (11), and when setting a screw, the screw blown up from the screw supply part (16) is transferred to the suction part through the sleeve (11) that comes into contact with the screw supply part (16). An automatic screw tightening device comprising a rotary tool (1) that is suctioned by a rotary tool (1) and set in the bit (7), wherein a screw is set in either the sleeve (11) or the screw supply section (16). An automatic screw tightening device characterized in that a spacer (31) is provided for forming a gap (32) between the sleeve (11) and the screw supply section (16).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6225489A JPH02243228A (en) | 1989-03-16 | 1989-03-16 | Automatic screw fastening device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6225489A JPH02243228A (en) | 1989-03-16 | 1989-03-16 | Automatic screw fastening device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02243228A true JPH02243228A (en) | 1990-09-27 |
Family
ID=13194826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6225489A Pending JPH02243228A (en) | 1989-03-16 | 1989-03-16 | Automatic screw fastening device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02243228A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04169768A (en) * | 1990-10-31 | 1992-06-17 | Sharp Corp | Refrigerator-freezer |
JP2009040564A (en) * | 2007-08-09 | 2009-02-26 | Fujitsu Ltd | Parts feeding device and method therefor |
CN104368961A (en) * | 2013-08-14 | 2015-02-25 | 广达电脑股份有限公司 | Screw locking machine |
CN105397702A (en) * | 2014-09-09 | 2016-03-16 | 松下知识产权经营株式会社 | Bolt fastening machine, adsorption tube for bolt fastening machine and bolt fastening method |
-
1989
- 1989-03-16 JP JP6225489A patent/JPH02243228A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04169768A (en) * | 1990-10-31 | 1992-06-17 | Sharp Corp | Refrigerator-freezer |
JP2009040564A (en) * | 2007-08-09 | 2009-02-26 | Fujitsu Ltd | Parts feeding device and method therefor |
US8425175B2 (en) | 2007-08-09 | 2013-04-23 | Fujitsu Limited | Part-delivery apparatus and method for the same |
CN104368961A (en) * | 2013-08-14 | 2015-02-25 | 广达电脑股份有限公司 | Screw locking machine |
CN105397702A (en) * | 2014-09-09 | 2016-03-16 | 松下知识产权经营株式会社 | Bolt fastening machine, adsorption tube for bolt fastening machine and bolt fastening method |
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