WO2022210327A1 - アーム状構造体およびロボット - Google Patents
アーム状構造体およびロボット Download PDFInfo
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- WO2022210327A1 WO2022210327A1 PCT/JP2022/014258 JP2022014258W WO2022210327A1 WO 2022210327 A1 WO2022210327 A1 WO 2022210327A1 JP 2022014258 W JP2022014258 W JP 2022014258W WO 2022210327 A1 WO2022210327 A1 WO 2022210327A1
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- WIPO (PCT)
- Prior art keywords
- main body
- arm
- body portion
- shaped structure
- structure according
- Prior art date
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- 239000011347 resin Substances 0.000 claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 238000001746 injection moulding Methods 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 239000012783 reinforcing fiber Substances 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000000295 complement effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J18/00—Arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/0009—Constructional details, e.g. manipulator supports, bases
- B25J9/0012—Constructional details, e.g. manipulator supports, bases making use of synthetic construction materials, e.g. plastics, composites
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
- F16B11/008—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing of tubular elements or rods in coaxial engagement
Definitions
- the present disclosure relates to arm-shaped structures and robots.
- the structure in which an arm-shaped structure with hollow mounting interfaces provided at both ends of a hollow pipe-shaped arm body is integrally molded with resin does not require a core to be arranged over the entire length of the long arm body. There is, and ingenuity is required for the structure of the core. Therefore, it is desirable to easily manufacture an arm-like structure with a hollow mounting interface at at least one end of a hollow pipe-like body.
- One aspect of the present disclosure includes a pipe-shaped main body and a mounting interface that is joined to at least one end of the main body and can be fixed to another component, wherein at least the main body and the mounting interface A portion of the body portion and the mounting interface portion are molded by injection molding a resin containing discontinuous reinforcing fibers, and the body portion and the mounting interface portion are formed by the projections and depressions formed by the injection molding. It is an arm-like structure that is joined in a state in which relative movement around the longitudinal axis is locked.
- the definition of discontinuous reinforcing fibers here will be explained.
- the length of reinforcing fibers contained in resin pellets for injection molding is said to be about 1 mm for short fibers and about 2 mm for long fibers.
- the discontinuous reinforcing fibers here refer to reinforcing fibers for injection molding having a length of about 1 to 2 mm, which are called short fibers or long fibers.
- FIG. 1 is a front view showing an arm-like structure according to an embodiment of the present disclosure
- FIG. FIG. 2 is a longitudinal sectional view showing the arm-shaped structure of FIG. 1
- FIG. 2 is a partially enlarged longitudinal sectional view showing an attachment interface portion of the arm-like structure of FIG. 1
- FIG. 2 is a perspective view showing reinforcing fibers forming a body portion and an attachment interface portion of the arm-shaped structure of FIG. 1
- FIG. 2 is a longitudinal sectional view showing an example of a mold for manufacturing the arm-shaped structure of FIG. 1
- FIG. 3 is a partial vertical cross-sectional view of a mounting interface showing a first modification of the arm-like structure of FIG.
- FIG. 1 2 is a partial vertical cross-sectional view of a mounting interface showing a second modification of the arm-like structure of FIG. 1;
- FIG. FIG. 4 is a partial vertical cross-sectional view of a mounting interface showing a third modification of the arm-like structure of FIG. 1;
- FIG. 10 is a partial vertical cross-sectional view of a mounting interface showing a fourth modification of the arm-like structure of FIG. 1;
- FIG. 11 is a partial vertical cross-sectional view of an attachment interface showing a fifth modification of the arm-like structure of FIG. 1;
- the arm-shaped structure 1 according to this embodiment is, for example, a robot arm.
- the robot according to this embodiment has at least one arm-like structure 1 .
- the arm-shaped structure 1 according to this embodiment includes a cylindrical pipe-shaped main body 2 having an inner hole 2a and both ends of the main body 2 in the longitudinal direction. and a pair of mounting interface portions 3 joined to each other.
- the main body 2 is made of, for example, carbon fiber reinforced resin (CFRP).
- CFRP carbon fiber reinforced resin
- the attachment interface portion 3 is also made of carbon fiber reinforced resin containing discontinuous reinforcing fibers, and has a hollow portion 4 communicating with the inner hole 2 a of the main body portion 2 .
- the mounting interface portion 3 is provided with an annular flange portion 5 for fixing to other parts constituting the robot, for example, the output shaft of a speed reducer.
- the flange portions 5 of the pair of mounting interface portions 3 are provided with flange surfaces 5 a arranged on the same plane parallel to the longitudinal axis of the body portion 2 .
- the flange portion 5 has a central hole 6 that opens the hollow portion 4 in the center, and has a plurality of through holes 7 arranged around the central hole 6 at intervals in the circumferential direction.
- a filamentous body such as a cable is passed through the central hole 6 of one of the flanges 5 and into the inner hole 2a of the main body 2, and the filamentary body is routed along the route taken out from the central hole 6 of the other flange 5. can do.
- the flange portion 5 is provided in the hollow portion 4 to improve the appearance of the arm, and the opening 11 is of a relatively large size so that tools and human hands can be inserted therein.
- the mounting interface portion 3 also includes a flat metal plate 41 embedded in the flange portion 5 .
- the metal plate 41 is formed in a ring plate shape having a central hole 42, as shown in FIGS.
- the metal plate 41 is provided with a plurality of through holes 43 penetrating in the plate thickness direction at intervals in the circumferential direction.
- the metal plate 41 exposes the entire mounting surface 41a with one surface in the plate thickness direction as the mounting surface 41a. Further, the other surface of the metal plate 41 in the plate thickness direction is partially exposed in the through holes 7 of the flange portion 5 with the surroundings of some through holes 43 partially exposed in the through holes 7 of the flange portion 5 . partially covered.
- the surface of the metal plate 41 exposed around the through-hole 43 functions as a bearing surface for a mounting screw (not shown) inserted into the through-hole 43 .
- the body portion 2 and the pair of mounting interface portions 3 are joined by the following structure. That is, as shown in FIGS. 2 and 3, the body portion 2 has through holes (concave portions) 8 that penetrate in the radial direction at positions separated by a predetermined distance from both ends in the longitudinal direction. .
- the through-holes 8 have a circular cross-sectional shape, and a plurality of, for example, four, are provided in the vicinity of each end at intervals in the circumferential direction.
- the mounting interface portion 3 includes a cylindrical fitting portion 9 to which the outer peripheral surfaces of both ends of the body portion 2 are fitted, and a cylindrical fitting portion 9 that protrudes radially inward from the inner surface of the fitting portion 9 and penetrates the body portion 2 .
- Complementary projections (concave and convex portions) 10 are provided that fit snugly into the holes 8 . As shown in FIG.
- the orientation direction of the reinforcing fibers 30 in the resin forming the main body portion 2 and the attachment interface portion 3 is such that at least a part of the reinforcing fibers 30 is in the shear direction of the convex portion 10, that is, the convex portion 10 is preferably oriented in a direction perpendicular to the circumferential direction and the axial direction of the body portion 2 in .
- the arm-shaped structure 1 according to this embodiment is manufactured by injection molding a resin using a mold 100 shown in FIG.
- the mold 100 includes an upper mold 110 and a lower mold 120 that can be opened and closed in the vertical direction, a cylindrical first movable mold 125 supported so as to be linearly movable in the vertical direction, and a horizontal movable mold 125 that passes through the first movable mold 125. and a cylindrical second movable mold 130 supported so as to be linearly movable.
- the tip of the second movable mold 130 is provided with a fitting protrusion 131 that can be fitted into the inner hole 2a of the main body 2 without a gap.
- the through holes 8 are formed in the vicinity of both ends of the main body 2 .
- one end of the main body 2 is inserted horizontally in one direction into the space formed between the upper mold 110 and the lower mold 120 and accommodated. do.
- the metal plate 41 attached to the tip of the first movable die 125 the first movable die 125 is inserted vertically upward, and the second movable die 130 is inserted horizontally from the opposite direction to the main body 2.
- the fitting convex portion 131 is fitted into the inner hole 2a of the main body portion 2. As shown in FIG.
- a cavity 140 corresponding to the mounting interface portion 3 is formed by the upper die 110 , the lower die 120 , the first movable die 125 , the second movable die 130 and the outer surfaces of the body portion 2 . Then, by injecting molten resin into the cavity 140 through the through hole 111 provided in the upper mold 110 , the mounting interface portion 3 can be molded at one end of the main body portion 2 .
- the position of the through hole 111 is not limited to the position shown in FIG. Considering the orientation of the reinforcing fibers 30 in the resin, they may be arranged at optimum positions. Alternatively, the mounting interface portion 3 may be molded while the metal plate 41 is mounted on the lower mold 120 .
- a cylindrical fitting portion 9 surrounding one end portion of the main body portion 2 over a longitudinal range including the through hole 8 is formed. It is formed at a position in close contact with the outer peripheral surface of the body portion 2 . Along with this, part of the molten resin of the fitting portion 9 flows into the through hole 8 and extends radially inward from the inner surface of the fitting portion 9 to form a cylindrical shape having a shape complementary to the through hole 8 . is formed.
- the protrusions 10 that are formed when the molten resin is injected are fitted into the through holes 8 formed in the main body 2 .
- the pair of mounting interface portions 3 joined to both ends of the body portion 2 is restricted from relative movement in the axial direction and the circumferential direction of the body portion 2, that is, the longitudinal axis direction and the longitudinal axis of the body portion 2 are restricted. It can be fixed to the main body part 2 in a state in which relative movement around it is locked.
- the mold 100 can be constructed relatively easily.
- the elongated main body 2 is configured in the shape of a metal pipe, there is no need to arrange cores over the entire length of the main body 2 when molding the mounting interface 3, which is advantageous in that it can be manufactured easily.
- the through hole 8 of the main body 2 is closed from the inside by the second movable die 130 having the fitting protrusion 131 that fits into the inner hole 2a of the main body 2, the molten resin leaks into the main body 2. You can prevent it from coming out.
- a first movable mold 125 and a second movable mold 130 that move relative to the upper mold 110 and the lower mold 120 that open and close in the vertical direction are provided. As a result, the working opening 11 that communicates with the inner hollow portion 4 can be formed in the mounting interface portion 3 located on the path of the first movable mold 135 and the second movable mold 130 .
- the mounting interface portion 3 is made of the same carbon fiber reinforced resin as the resin forming the main body portion 2, fusion of the resin between the main body portion 2 and the mounting interface portion 3 is facilitated. By bonding, the bonding strength can be improved.
- the main body 2 is made of carbon fiber reinforced resin in this embodiment, it is not limited to this.
- a metal such as an aluminum alloy or a magnesium alloy may be used as the material of the body portion 2 .
- the body portion 2 may be made of resin that does not contain the reinforcing fibers 30 .
- the attachment interface portion 3 may be made of a metal such as an aluminum alloy or a magnesium alloy, set in the mold 100 as a metal insert, and the body portion 2 may be molded of carbon fiber resin.
- the through hole 8 provided in the main body 2 has a circular cross section, it may have an arbitrary cross section instead. Also, the size of the cross-sectional shape may be arbitrary. Moreover, the number of through holes 8 provided in the body portion 2 should be one or more. It is desirable to provide a sufficient number of protrusions 10 or recessed through-holes 8 with respect to the main body 2 to ensure sufficient strength so that the fitting portion 9 does not come off or rotate due to shear failure. In order to secure tough strength, a plurality of through-holes 8 may be provided and evenly arranged on the circumference of the body portion 2 .
- the concave portion provided in the main body portion 2 is the through hole 8, but the present invention is not limited to this, and as shown in FIG. A non-through recess 12 may be employed that extends to the . With this configuration, there is no need to close the through hole 8 with the second movable die 130, and the configuration of the die 100 can be further simplified.
- the recessed portion 12 may be recessed radially inward from the outer peripheral surface of the main body portion 2 or may be recessed radially outward from the inner peripheral surface of the main body portion 2 .
- the fitting portion 9 of the mounting interface portion 3 may be formed in a cylindrical shape that fits into the inner peripheral surface of the main body portion 2, as shown in FIG. good.
- the fitting portion 9 of the mounting interface portion 3 is formed with a concave portion (concavo-convex portion) 14 that has a complementary shape to the convex portion 13 and accommodates the convex portion 13 . be done.
- the fitting portion 9 of the mounting interface portion 3 as shown in FIG. A shape having both may be adopted.
- the convex portion 10 formed in the through hole 8 of the main body portion 2 is formed in a columnar shape connecting the inner fitting portion 15 and the outer fitting portion 16 .
- the attachment interface portion 3 and the main body portion 2 can be joined more firmly.
- another member (metal, fiber reinforced resin, etc.) different from the body portion 2 and the mounting interface portion 3 is set as an insert in the mold 100 together with the body portion 2.
- the mounting interface portion 3 may be injection molded.
- a reinforcing member having a through-hole made of metal or fiber-reinforced resin inside the main body 2 may be inserted together with the main body 2 .
- the arm-shaped structure 1 having the attachment interface portions 3 at both ends of the main body portion 2 is illustrated, but instead of this, a structure having the attachment interface portion 3 only at one end is adopted.
- a structure having the attachment interface portion 3 only at one end is adopted.
- attachment interface portions 3 at both ends are molded in advance in a separate process, set in the injection molding mold for the main body portion 2 side, and then the main body portion 2 is injection-molded to form the main body portion 2 and the attachment interface portion. 3 may be integrated.
- the body portion 2 is not limited to a straight round pipe shape, and may have a shape in which the diameter increases toward both ends, or may have a square pipe shape.
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- Engineering & Computer Science (AREA)
- Robotics (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Manipulator (AREA)
Abstract
Description
ここでの不連続の強化繊維の定義について説明する。一般的に射出成形用の樹脂ペレットに含まれる強化繊維の長さは、短繊維と言われるもので1mm前後、長繊維と言われるもので2mm前後と言われている。これより長い繊維となると、射出成形機のスクリューに強化繊維が絡まってしまい、射出成形機を破損させるリスクが高まってしまう。ここでの不連続の強化繊維は、短繊維、長繊維と言われる1~2mm前後の長さの射出成形用の強化繊維のことを指している。
本実施形態に係るアーム状構造体1は、例えば、ロボットアームである。
本実施形態に係るロボットは、アーム状構造体1を少なくとも1つ備えている。
本実施形態に係るアーム状構造体1は、図1および図2に示されるように、内孔2aを有する円筒のパイプ状の本体部2と、本体部2の長手軸方向の両方の端部に接合された一対の取付インタフェース部3とを備えている。
取付インタフェース部3も、不連続の強化繊維を含む炭素繊維強化樹脂により構成され、本体部2の内孔2aに連絡する中空部4を有している。
金属プレート41は、図1から図3に示されるように、中央孔42を有するリング板状に形成されている。金属プレート41には、板厚方向に貫通する複数の貫通孔43が、周方向に間隔をあけて設けられている。
すなわち、本体部2は、図2および図3に示されるように、長手軸方向の両方の端部から所定距離だけ離れた位置に、径方向に貫通する貫通孔(凹部)8を備えている。貫通孔8は、円形の横断面形状を有し、各端部近傍に、周方向に間隔をあけて複数、例えば、4個ずつ設けられている。
本体部2および取付インタフェース部3を構成する樹脂内の強化繊維30の配向方向は、図4に示されるように、強化繊維30の少なくとも一部が凸部10のせん断方向、すなわち、凸部10における本体部2の周方向および軸方向に対し垂直な方向に配向されていることが好ましい。
本実施形態に係るアーム状構造体1は、図5に示される金型100を用いて、樹脂を射出成形することにより製造される。
そして、図5に示されるように、上型110と下型120とを閉鎖することにより間に形成される空間に、本体部2の一方の端部を水平方向一方向から挿入した状態に収容する。これとともに、第1可動型125の先端に金属プレート41を取り付けた状態で、鉛直上方から第1可動型125を挿入し、本体部2とは逆方向から水平方向に第2可動型130を挿入して、嵌合凸部131を本体部2の内孔2aに嵌合させる。
貫通孔111の位置は、図5の位置に限るものではない。樹脂内の強化繊維30の配向を考慮して、最適な位置に配置すればよい。
また、金属プレート41は下型120に取り付けた状態で取付インタフェース部3を成形してもよい。
また、上下方向に開閉する上型110および下型120に対して移動する第1可動型125および第2可動型130を設けた。これにより、第1可動型135および第2可動型130の経路に位置する取付インタフェース部3に内側の中空部4に連通する作業用の開口11を形成することができる。
また、本体部2に設ける貫通孔8の数は1以上であればよい。本体部2に対し、凸部10あるいは凹部である貫通孔8がせん断破壊して、嵌合部9が抜けたり回ったりしないような十分な強度を確保できる数を設けることが望ましい。強靭な強度を確保するために、貫通孔8を複数とし、本体部2の周上に均等に配置してもよい。
また、図示しないが、本体部2の内側に金属や繊維強化樹脂製の貫通孔を備える補強部材を本体部2と一緒にインサートとした構造としてもよい。
また、本体部2はストレートの丸パイプ形状に限定されるものではなく、両端部に向かって直径が大きくなる形状でもよく、あるいは、角パイプ形状であってもよい。
2 本体部
2a 内孔
3 取付インタフェース部
8 貫通孔(凹部)
9 嵌合部
10 凸部(凹凸部)
12 凹部
13 凸部
14 凹部(凹凸部)
15 内側嵌合部
16 外側嵌合部
30 強化繊維
100 金型
125 第1可動型
130 第2可動型
140 キャビティ
Claims (10)
- パイプ状の本体部と、
該本体部の少なくとも一方の端部に接合され、他部品に固定可能な取付インタフェース部とを備え、
前記本体部および前記取付インタフェース部の少なくとも一部が、不連続な強化繊維を含む樹脂を射出成形することによって成形され、
前記本体部と前記取付インタフェース部とは、射出成形により形成される凹凸部によって、前記本体部の長手軸方向および該長手軸回りの相対移動を係止された状態に接合されているアーム状構造体。 - 前記取付インタフェース部が、前記本体部の両方の前記端部にそれぞれ接合されている請求項1に記載のアーム状構造体。
- 前記本体部の前記端部近傍に、内周面または外周面から径方向に延びる1以上の凹部または凸部がそれぞれ設けられ、
前記取付インタフェース部が、射出成形時に前記本体部の前記端部から前記凹部または前記凸部を覆う軸方向位置まで延びて前記本体部の前記端部を嵌合させる筒状の嵌合部を備え、
前記凹凸部が、射出成形時に前記嵌合部から径方向に延びて前記凹部または前記凸部と嵌合する相補的な形状に形成されている請求項1に記載のアーム状構造体。 - 前記凹部または前記凸部が周方向に間隔をあけて複数設けられている請求項3に記載のアーム状構造体。
- 前記嵌合部が、前記本体部の外面を嵌合させる請求項3または請求項4に記載のアーム状構造体。
- 前記凹部が、前記本体部の径方向に貫通する1以上の貫通孔である請求項3から請求項5のいずれかに記載のアーム状構造体。
- 前記嵌合部が、前記本体部の外面に嵌合する外側嵌合部と、前記本体部の内面に嵌合する内側嵌合部とを備え、
前記凹部が、前記本体部の径方向に貫通する貫通孔であり、
前記凹凸部が、前記貫通孔に嵌合し、前記外側嵌合部と前記内側嵌合部とを連結する柱状に形成されている請求項3または請求項4に記載のアーム状構造体。 - 前記本体部および前記取付インタフェース部の少なくとも一部が不連続の強化繊維を含む樹脂により構成されている請求項1に記載のアーム状構造体。
- 前記強化繊維の少なくとも一部の繊維の方向が、前記凹凸部のせん断方向に対し垂直な方向に配向されている請求項1または請求項8に記載のアーム状構造体。
- 請求項1から請求項9のいずれかに記載のアーム状構造体を少なくとも1つ備えるロボット。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN202280023489.7A CN117120222A (zh) | 2021-03-31 | 2022-03-25 | 臂状结构体以及机器人 |
US18/548,948 US20240149473A1 (en) | 2021-03-31 | 2022-03-25 | Arm-shaped structure and robot |
JP2023511159A JP7538333B2 (ja) | 2021-03-31 | 2022-03-25 | アーム状構造体およびロボット |
DE112022000660.9T DE112022000660T5 (de) | 2021-03-31 | 2022-03-25 | Armförmige struktur und roboter |
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JP2021-058979 | 2021-03-31 | ||
JP2021058979 | 2021-03-31 |
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JP (1) | JP7538333B2 (ja) |
CN (1) | CN117120222A (ja) |
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JP7339476B1 (ja) * | 2023-04-28 | 2023-09-05 | ファナック株式会社 | アーム部材およびロボット |
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- 2022-03-25 US US18/548,948 patent/US20240149473A1/en active Pending
- 2022-03-25 WO PCT/JP2022/014258 patent/WO2022210327A1/ja active Application Filing
- 2022-03-25 CN CN202280023489.7A patent/CN117120222A/zh active Pending
- 2022-03-25 DE DE112022000660.9T patent/DE112022000660T5/de active Pending
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CN117120222A (zh) | 2023-11-24 |
DE112022000660T5 (de) | 2023-11-02 |
JPWO2022210327A1 (ja) | 2022-10-06 |
TW202239553A (zh) | 2022-10-16 |
US20240149473A1 (en) | 2024-05-09 |
JP7538333B2 (ja) | 2024-08-21 |
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