WO2012039479A1 - 人間型電動ハンド - Google Patents
人間型電動ハンド Download PDFInfo
- Publication number
- WO2012039479A1 WO2012039479A1 PCT/JP2011/071716 JP2011071716W WO2012039479A1 WO 2012039479 A1 WO2012039479 A1 WO 2012039479A1 JP 2011071716 W JP2011071716 W JP 2011071716W WO 2012039479 A1 WO2012039479 A1 WO 2012039479A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- joint
- finger
- electric hand
- thumb
- elastic member
- 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.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J15/00—Gripping heads and other end effectors
- B25J15/02—Gripping heads and other end effectors servo-actuated
- B25J15/0206—Gripping heads and other end effectors servo-actuated comprising articulated grippers
- B25J15/024—Gripping heads and other end effectors servo-actuated comprising articulated grippers having fingers directly connected to actuator
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/54—Artificial arms or hands or parts thereof
- A61F2/58—Elbows; Wrists ; Other joints; Hands
- A61F2/583—Hands; Wrist joints
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/54—Artificial arms or hands or parts thereof
- A61F2/58—Elbows; Wrists ; Other joints; Hands
- A61F2/583—Hands; Wrist joints
- A61F2/585—Wrist joints
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/54—Artificial arms or hands or parts thereof
- A61F2/58—Elbows; Wrists ; Other joints; Hands
- A61F2/583—Hands; Wrist joints
- A61F2/586—Fingers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J15/00—Gripping heads and other end effectors
- B25J15/0009—Gripping heads and other end effectors comprising multi-articulated fingers, e.g. resembling a human hand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J15/00—Gripping heads and other end effectors
- B25J15/0028—Gripping heads and other end effectors with movable, e.g. pivoting gripping jaw surfaces
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2002/5072—Prostheses not implantable in the body having spring elements
- A61F2002/5073—Helical springs, e.g. having at least one helical spring
- A61F2002/5075—Multiple spring systems including two or more helical springs
- A61F2002/5076—Concentric outer and inner helical springs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/54—Artificial arms or hands or parts thereof
- A61F2/58—Elbows; Wrists ; Other joints; Hands
- A61F2/583—Hands; Wrist joints
- A61F2/586—Fingers
- A61F2002/587—Thumbs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/68—Operating or control means
- A61F2002/6836—Gears specially adapted therefor, e.g. reduction gears
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/50—Prostheses not implantable in the body
- A61F2/68—Operating or control means
- A61F2/70—Operating or control means electrical
- A61F2002/701—Operating or control means electrical operated by electrically controlled means, e.g. solenoids or torque motors
Definitions
- the present invention relates to a human-type electric hand used for an electric prosthesis, a humanoid robot, or the like.
- the human-type electric hand described in Patent Document 3 requires a motor with a large output to drive fingers other than the thumb in order to secure a high gripping force with a high degree of freedom. For this reason, the weight of the electric hand is increased.
- the degree of freedom is not set in the wrist, it is necessary to perform an unnatural operation. For example, in order not to spill liquid in the cup when the cup is gripped, it is necessary to tilt the body and adjust the posture of the cup.
- the control unit is provided outside the electric hand. For this reason, it is necessary to route many cables between the electric hand and the control unit. Therefore, the operation of the electric hand is limited, or the reliability of the operation of the electric hand is reduced.
- An object of the present invention is to provide a human-type electric hand that is lightweight and easy to maintain.
- a finger motor for driving a finger is connected to the worm speed reduction mechanism, and the output gear of the worm speed reduction mechanism is rotated so that the middle finger joint is A humanoid electric hand that bends / extends and flexes / extends the phalangeal joint in conjunction with the flexion / extension movement of the metacarpal joint by connecting the metacarpal joint to the phalangeal joint via a link mechanism Is provided.
- the finger motor rotates, the rotation is decelerated by the worm deceleration mechanism, and then the output gear is rotated. Then, according to the rotation of the output gear, the middle finger joint of the finger bends / extends.
- the phalangeal joint connected to the metacarpal joint via a link mechanism is flexed / extended in conjunction with the movement of the metacarpal joint.
- the finger can be bent / extended by a simple configuration including only one motor, a worm speed reduction mechanism, and a link mechanism. For this reason, weight reduction of a human type electric hand is possible. Further, since the finger is bent / extended without using a wire, the frequency of parts replacement is reduced and maintenance is facilitated.
- the link mechanism preferably includes a drive link composed of two parts connected via an elastic member.
- a drive link including an elastic member and two parts connected via the elastic member is employed as a link mechanism for connecting the metacarpal joint and the phalangeal joint.
- the drive link expands and contracts according to the external force applied to the fingertip, and thereby the joint angle of the phalangeal joint can be elastically changed.
- the joint angle of the phalangeal joint follows the shape of the object to be grasped. Therefore, a stable object gripping operation can be performed.
- the above human-type electric hand includes a first elastic member and a second elastic member as elastic members, and the first elastic member is a force in a direction to change the joint angle of the phalangeal joint to the bending side. Is compressed by acting on the drive link, and the second elastic member has a larger elastic modulus than the first elastic member, and a force in a direction to change the joint angle of the phalangeal joint to the extension side is applied to the drive link. It is preferable that the second elastic member is disposed so as not to expand when the first elastic member is compressed.
- the elastic force of the second elastic member does not act, and only the elastic force of the first elastic member having a smaller elastic modulus is driven. Act on links.
- the elastic force of the second elastic member having a higher elastic modulus acts on the drive link. Therefore, when the joint angle of the phalanx joint is elastically changed to the extension side, a larger force is required than when the joint angle of the phalangeal joint is elastically changed to the flexion side.
- the thumb of the electric hand preferably has a two-degree-of-freedom mechanism that performs a turning operation and a bending / extending operation.
- the object can be more easily gripped.
- the object can be sandwiched and held by the turning operation of the thumb and the bending operation of the other fingers.
- the pressing of the thumb is shared and supported by four fingers other than the thumb.
- a small motor with a small maximum output can be adopted as the finger motor used for the bending / extending operation of each finger. Further, if the maximum output of the thumb-turning motor can be sufficiently secured, the object can be grasped accurately.
- a motor having a larger maximum output than the finger motor used for the bending / extending operation of each finger is adopted as the motor used for the turning operation of the thumb.
- the wrist part of the electric hand has a mechanism with two degrees of freedom for performing the pronation / extraction operation and the bending / extension operation.
- the object can be gripped by a more natural arm posture.
- the pronation / extraction operation and bending / extension operation of the wrist are performed by two motors and a differential reduction mechanism.
- (A) is a side view of a humanoid electric hand according to an embodiment of the present invention
- (b) is a plan view of the humanoid electric hand.
- (A) is a side view which shows the internal structure of a human type electric hand
- (b) is a top view of a human type electric hand.
- (A) is a top view which shows the state in which the cover was attached to the wrist drive mechanism in a humanoid electric hand
- (b) is a top view which shows the state which removed the cover from the wrist drive mechanism.
- the side view which shows the internal structure of the index finger of a humanoid electric hand.
- (A) is a top view of the 1st drive link in the index finger of a human type electric hand
- (b) is a side view of the 1st drive link.
- FIGS. 1 to 10 an embodiment embodying the human-type electric hand of the present invention will be described in detail with reference to FIGS. 1 to 10.
- the humanoid electric hand of this embodiment is used as an electric prosthesis.
- the humanoid electric hand includes a wrist portion 1, a palm portion 2, and five fingers: a thumb 3, an indicating finger 4, a middle finger 5, a ring finger 6, and a little finger 7.
- the wrist 1 corresponds to a human wrist.
- the palm 2 corresponds to a human palm.
- Artificial skin is attached to the surface of the electric hand.
- a pressure sensor is disposed between the artificial skin and the frame of each finger.
- As the artificial skin a gel-like highly functional material having a durometer hardness of 12, a tensile strength of 9.6 MPa, and a weight of 64 g is used.
- the wrist 1 is driven by a wrist driving mechanism shown in FIG.
- the wrist drive mechanism includes two wrist motors 8 and 9. As shown in FIG. 2, the wrist motors 8 and 9 are built in the palm 2 of the human-type electric hand.
- a first bevel gear 50 is fixed to the output shaft of the wrist motor 8 provided on the left side in FIG.
- a second bevel gear 51 is meshed with the first bevel gear 50.
- the first and second bevel gears 50 and 51 are arranged with their axes orthogonal to each other.
- a third bevel gear 52 is rotatably connected to the second bevel gear 51 together with the second bevel gear 51.
- a fourth bevel gear 53 is meshed with the third bevel gear 52.
- the third and fourth bevel gears 52 and 53 are arranged with their axes orthogonal to each other.
- a first bevel gear 54 is fixed to the output shaft of the wrist motor 9 provided on the right side in FIG.
- a second bevel gear 55 is meshed with the first bevel gear 54.
- the first and second bevel gears 54 and 55 are arranged with their axes orthogonal to each other.
- a third bevel gear 56 is rotatably connected to the second bevel gear 55 together with the second bevel gear 55.
- a fourth bevel gear 53 is meshed with the third bevel gear 56.
- the third and fourth bevel gears 56 and 53 are arranged with their axes orthogonal to each other.
- the second bevel gear 55 and the third bevel gear 56 are arranged coaxially with the second bevel gear 51 and the third bevel gear 52.
- the bevel gears 50 to 56 constitute a differential reduction mechanism.
- the wrist portion 1 moves so as to rotate in / out.
- the wrist portion 1 performs the pronation / extraction operation and the bending / extension operation by driving the gear. That is, the wrist 1 is configured as a mechanism with two degrees of freedom.
- the configuration of the index finger 4 will be described with reference to FIGS. 4 and 5.
- the middle finger 5, the ring finger 6 and the little finger 7 have a configuration that is substantially the same as that of the index finger 4 except that the length of each node is different.
- the index finger 4 includes a base portion 11 fixed to the palm portion 2, and three nodes, a base clause 12, a middle clause 13, and a terminal clause 14.
- the base clause 12 has a built-in finger motor 16.
- the middle finger joint 15 which is a joint between the base portion 11 and the base joint 12, is bent / extended.
- a worm (screw gear) 18 that is an input gear of the worm reduction mechanism 17 is fixed to the output shaft of the finger motor 16.
- the worm 18 is meshed with a worm wheel (helical gear) 19 fixed to the base 11.
- the worm wheel 19 corresponds to an output gear of the worm reduction mechanism 17.
- the base 12 of the index finger 4 is supported so as to be rotatable with respect to the axis of the worm wheel 19.
- the axis of the worm wheel 19 is the middle finger joint 15.
- the proximal phalangeal joint 20 supports the middle joint 13 so as to be rotatable.
- a first drive link 21 is installed between the proximal phalangeal joint 20 and the metacarpal joint 15.
- the base end of the first drive link 21 is disposed at a position eccentric from the middle finger joint 15 and is supported to be rotatable with respect to the base 11.
- the distal end of the first drive link 21 is disposed at a position eccentric from the proximal phalangeal joint 20 and is supported to be rotatable with respect to the middle joint 13.
- a distal phalangeal joint 22 that is a joint between the middle section 13 and the end section 14 is provided at the tip of the middle section 13.
- the distal phalangeal joint 22 is rotatably supported by the distal phalanx 14.
- a second drive link 23 is installed between the distal phalangeal joint 22 and the proximal phalangeal joint 20.
- the proximal end of the second drive link 23 is disposed at a position eccentric from the proximal phalangeal joint 20 and is supported to be rotatable with respect to the proximal joint 12.
- the tip of the second drive link 23 is disposed at a position eccentric from the distal phalangeal joint 22 and is supported so as to be rotatable with respect to the distal node 14.
- the first drive link 21 is formed of two parts, a first rod 24 and a second rod 25.
- the first drive link 21 expands and contracts by causing the first rod 24 and the second rod 25 to translate.
- the first rod 24 and the second rod 25 are connected via two coil springs 26 and 27 as elastic members.
- springs having different elastic moduli are employed.
- the coil spring 26 corresponding to the second elastic member has a larger elastic modulus than the coil spring 27 corresponding to the first elastic member.
- the first drive link 21 contracts, the coil spring 27 is compressed.
- the first drive link 21 extends, the coil spring 26 is compressed. For this reason, the length of the 1st drive link 21 changes elastically by the effect
- the coil spring 26 is disposed so as not to be compressed or pulled when no external force is applied to the first drive link 21. Further, both ends of the coil spring 26 are not fixed to the first rod 24 and the second rod 25. When the coil spring 26 extends to its natural length, both ends of the coil spring 26 are connected to the first rod 24 and the second rod 26. Separate from the rod 25. Therefore, the coil spring 26 is disposed so as not to expand when the first drive link 21 is contracted with the compression of the coil spring 27.
- the middle finger 5 As described above, the middle finger 5, the ring finger 6, and the little finger 7 have substantially the same configuration as the index finger 4, and their operations are the same as those of the index finger 4.
- the worm 18 rotates, thereby rotating the worm wheel 19.
- the worm wheel 19 is fixed to the palm 2. Therefore, the rotation of the finger motor 16 causes the base joint 12 incorporating the finger motor 16 to rotate around the middle finger joint 15 that is the axis of the worm wheel 19. As a result, the proximal joint 12 bends / extends with respect to the base 11 around the middle finger joint 15.
- the movement is transmitted to the proximal phalangeal joint 20 via the first drive link 21, and the bending operation of the proximal phalangeal joint 20 is performed.
- the movement is further transmitted to the distal phalangeal joint 22 via the second drive link 23, and the bending operation of the distal phalangeal joint 22 is performed.
- the index finger 4 is configured to perform the bending / extending operation of the proximal phalangeal joint 20 and the distal phalangeal joint 22 in conjunction with the bending / extending operation of the metacarpal joint 15.
- the rotation of the finger motor 16 is restricted by the self-lock function of the worm deceleration mechanism. That is, the index finger 4 does not have back drivability. Therefore, even if an external force is applied to the fingertip while the finger motor 16 is stopped, the joint angle of the middle finger joint 15 is kept constant.
- the first drive link 21 can elastically expand and contract. For this reason, when a force in a direction in which the index finger 4 is extended is applied to the fingertip of the index finger 4, the first drive link 21 extends, and the proximal phalangeal joint 20 and the distal phalangeal joint 22 extend. Therefore, when the fingertip of the index finger 4 comes into contact with the object during the bending operation by the finger motor 16 and the reaction force is applied to the fingertip, the proximal phalangeal joint 20 and the distal phalangeal joint 22 are extended, respectively. 4 will not bend any further. As a result, the joint angles of the proximal phalangeal joint 20 and the distal phalangeal joint 22 automatically follow the shape of the object to be grasped.
- the coil spring 26 is compressed as the first drive link 21 extends. Therefore, the elastic force generated by compressing the coil spring 26 can resist the reaction force applied to the fingertip when the object is gripped. Therefore, it is possible to prevent the phalangeal joints 20 and 22 from being extended while the object is gripped and the gripping force of the humanoid electric hand from being reduced.
- the first drive link 21 contracts and the proximal phalangeal joint 20 and the distal phalangeal joint 22 bend. Such elastic deformation of the first drive link 21 reduces the force acting on each member of the finger due to the collision with the obstacle.
- the coil spring 26 is disposed so as not to expand when the length of the first drive link 21 is reduced with the compression of the coil spring 27. Therefore, only the elastic force of the coil spring 27 having a relatively small elastic modulus acts on the first drive link 21 at this time. Therefore, even when the force applied to the fingertip is not so large, the proximal phalangeal joint 20 and the distal phalangeal joint 22 are elastically bent according to the contact of the obstacle.
- the thumb 3 is provided with a thumb turning mechanism.
- the thumb turning mechanism By the thumb turning mechanism, the thumb 3 can turn at the base portion thereof.
- the thumb turning mechanism includes a thumb turning motor 10 fixed to the palm 2.
- the thumb turning motor 10 is built in the palm 2 of the human-type electric hand (see FIG. 2).
- a first spur gear 28 is fixed to the output shaft of the thumb swing motor 10.
- a second spur gear 29 is engaged with the first spur gear 28.
- the second spur gear 29 is fixed to the base 32 of the thumb 3.
- the thumb turning motor 10 employs a motor having a larger maximum output than the finger motor 16 and the thumb motor 36.
- the thumb 3 has two nodes, a base node 33 and a terminal node 34.
- the thumb 3 has a metacarpal joint 35 that is a joint between the base 32 and the base 33 and a phalangeal joint 40 that is a joint between the base 33 and the end 34.
- the base 33 has a built-in thumb motor 36 for bending / extending the metacarpal joint 35.
- a worm 38 that is an input gear of the worm reduction mechanism 37 is fixed to the output shaft of the thumb motor 36.
- the worm 38 is meshed with a worm wheel 39 fixed to the base 32 of the thumb 3.
- the worm wheel 39 corresponds to an output gear of the worm reduction mechanism 37.
- the base joint 33 is supported so as to be rotatable with respect to the axis of the worm wheel 39.
- the axis of the worm wheel 39 is the middle finger joint 35 of the thumb 3.
- a phalangeal joint 40 is provided at the tip of the base joint 33.
- the phalanx joint 40 supports the end node 34 so as to be rotatable.
- a thumb drive link 41 is provided between the phalangeal joint 40 and the metacarpal joint 35.
- the proximal end of the thumb drive link 41 is disposed at a position eccentric from the middle finger joint 35 of the thumb 3 and is supported rotatably with respect to the base 32 (worm wheel 39).
- the tip of the thumb drive link 41 is disposed at a position eccentric from the phalangeal joint 40 of the thumb 3 and is supported so as to be rotatable with respect to the distal joint 34.
- the thumb drive link 41 is formed by two parts, a first rod 60 and a second rod 61. By moving the first rod 60 and the second rod 61 in translation, the thumb drive link 41 expands and contracts.
- the first rod 60 and the second rod 61 are connected via a coil spring 62 as an elastic member.
- the coil spring 62 is compressed by the first rod 60 and the second rod 61 in accordance with the reduction of the length of the thumb drive link 41.
- the thumb drive link 41 is composed of two parts connected via the elastic member, and is configured to be elastically extendable. However, elastic expansion / contraction of the thumb drive link 41 is allowed only within a range equal to or less than the natural length of the thumb drive link 41, that is, the length when no external force is applied.
- the thumb motor 36 rotates, the rotation is decelerated via the worm deceleration mechanism 37 and then transmitted to the middle finger joint 35.
- the middle finger joint 35 bends / extends.
- the middle finger joint 35 bends / extends in this way, the movement is transmitted to the phalanx joint 40 via the thumb drive link 41.
- the phalangeal joint 40 bends / extends in conjunction with the middle finger joint 35.
- the thumb drive link 41 can elastically reduce its length. For this reason, when an obstacle is contacted from the fingernail side of the fingertip, a compressive load is applied to the thumb drive link 41, whereby the length of the thumb drive link 41 is elastically shortened. Therefore, also in the thumb 3, the force acting on each member of the finger due to the collision with the obstacle is reduced.
- the thumb drive link 41 is only allowed to be elastically deformed in the direction in which the length is reduced, and is not elastically deformed in the direction in which the length is extended. Therefore, during grasping of the object, the phalangeal joint 40 of the thumb 3 is not extended by the reaction force applied from the object to the fingertip, and the pressing of the thumb 3 against the object is not reduced.
- the back 42 of the human-type electric hand incorporates a control board including a motor drive circuit. That is, as shown in FIG. 10, a recess 43 is formed in the upper portion 42.
- the recess 43 accommodates a driver board 44 provided with a drive circuit for each motor and a control board 45 provided with a control circuit.
- a hand cover 46 is attached to the upper portion 42 so as to cover the concave portion 43.
- the control circuit of the control board 45 has an input / output interface function for receiving an encoder signal of each motor, a pressure sensor signal attached to the electric hand, and the like, and outputting a PWM signal to each motor.
- a LAN terminal 47 is provided on the control board 45.
- the control circuit of the control board 45 has a LAN function for communicating with an external device.
- the control circuit also has a calculation function for calculating the output based on the input.
- the LAN function can also communicate with the myoelectric measurement system.
- the control circuit calculates a gripping force and a finger joint angle based on an input signal from the myoelectric measurement system, and outputs a PWM signal to each motor.
- the PWM signal output from the control circuit is input to the drive circuit of the driver board 44.
- the drive circuit amplifies the input PWM signal and outputs it to each motor.
- FPGA is adopted as an integrated circuit provided in the control circuit.
- the FPGA can be reprogrammed in the field.
- the finger motor 16 is connected to the worm reduction mechanism 17.
- the worm wheel 19 that is the output gear of the worm reduction mechanism 17 rotates, and the middle finger joint 15 bends / extends.
- the phalangeal joints 20 and 22 bend / extend in conjunction with the bending / extending operation of the metacarpal joint 15.
- a thumb motor 36 is connected to a worm reduction mechanism 37.
- the worm wheel 39 that is an output gear of the worm speed reduction mechanism 37 rotates, and the middle finger joint 35 bends / extends.
- the phalangeal joint 40 bends / extends in conjunction with the bending / extending operation of the metacarpal joint 35.
- the middle finger joint 15 of the finger bends / extends.
- the phalanx joints 20 and 22 are flexed / extended in conjunction with the movement of the metacarpal joint 15.
- the thumb motor 36 rotates, the rotation is decelerated by the worm deceleration mechanism 37 and then the worm wheel 39 is rotated.
- the middle finger joint 35 of the finger bends / extends.
- the phalangeal joint 40 is flexed / extended in conjunction with the movement of the metacarpal joint 35.
- a finger can be bent / extended by a simple configuration including only one motor 16, 36, worm reduction mechanism 17, 37, and link mechanism. For this reason, weight reduction of a human type electric hand is possible. Further, since the finger is bent / extended without using a wire, the frequency of parts replacement is reduced and maintenance is facilitated. Therefore, according to the above-described human-type electric hand, the weight can be reduced and the maintenance becomes easy.
- a coil spring 27 and a coil spring 26 are provided as elastic members that connect the first rod 24 and the second rod 25 of the first drive link 21.
- the coil spring 27 is compressed when a force in a direction in which the joint angle of the proximal phalangeal joint 20 and the distal phalangeal joint 22 is elastically changed to the bending side acts on the first drive link 21 to resist the force.
- Generate elastic force in the direction of The coil spring 26 is compressed when a force in a direction in which the joint angle of the proximal phalangeal joint 20 and the distal phalangeal joint 22 is elastically changed to the extension side acts on the first drive link 21 to resist the force.
- Generate elastic force in the direction of The coil spring 26 has a larger elastic modulus than the coil spring 27.
- the coil spring 26 is arranged so as not to expand when the coil spring 27 is compressed. For this reason, when the joint angle of the phalangeal joints 20 and 22 changes elastically according to the expansion and contraction of the first drive link 21, a large force is required in the direction in which the finger extends. Therefore, it is possible to resist the reaction force applied to the fingertip when gripping an object while automatically adjusting the joint angle of the phalangeal joint. Therefore, it is possible to prevent the finger from extending and the gripping force from decreasing, and to secure the gripping force of the object.
- the finger motor 16 and the thumb finger motor 36 are built in each finger. Therefore, all the components necessary for bending / extending each finger can be incorporated in each finger.
- the thumb 3 performs a turning operation and a bending / extending operation. That is, the thumb 3 is configured as a mechanism having two degrees of freedom. For this reason, it is possible to more easily perform an object gripping operation.
- the thumb turning motor 10 performs the turning operation of the thumb 3 and is built in the palm 2 of the electric hand. For this reason, the thumb 3 of the electric hand becomes more compact.
- the thumb motor 36 performs the bending / extending operation of the thumb 3 and is built in the base 33 of the thumb 3 where the installation space is limited. For this reason, it is difficult to employ a large motor as the thumb motor 36.
- the thumb turning motor 10 is built in the palm 2 having a sufficient installation space. For this reason, it is possible to employ a large motor for the thumb turning motor 10. Therefore, the power shortage of the thumb motor 36 can be compensated by the power of the thumb turning motor 10. Therefore, a large gripping force can be generated from the humanoid electric hand.
- the wrist part 1 performs a pronation / extraction operation and a bending / extension operation. That is, the wrist 1 is configured as a mechanism with two degrees of freedom. Therefore, the object can be gripped by a more natural arm posture.
- a motor having a larger maximum output than the finger motor 16 is adopted as the thumb turning motor 10.
- the object can be sandwiched and held by the pressing by the turning operation of the thumb 3 toward the palm and the pressing by the bending operation of the remaining four fingers.
- each finger other than the thumb 3 shares and receives the pressing of the thumb 3.
- a motor with a large maximum output can be adopted only for the thumb turning motor 10, and a small motor with a small maximum output can be adopted for the finger motor 16. Therefore, the human-type electric hand can be reduced in size and weight.
- Wrist motors 8 and 9 are built in the palm 2 of the electric hand. Therefore, all of the drive mechanism of the electric hand can be built in the electric hand. Further, when used as an electric prosthetic hand, the wrist motors 8 and 9 may be installed on the forearm side of the wrist part 1 in some cases. In this case, if the length from the cutting position of the forearm to the lost wrist is not long enough, the length of one hand wearing the electric hand becomes too long, and the length of the other hand becomes unbalanced. . In that respect, according to the present invention, since the wrist motors 8 and 9 are built in the palm portion 2, the electric hand can be attached to the cutting position of the forearm regardless of the cutting position of the forearm. That is, the electric hand can be appropriately attached only by adjusting the length of the socket interposed between the cutting position and the electric hand.
- the driver board 44 and the control board 45 include a control board including a motor drive circuit and are built in the upper part 42 of the electric hand. For this reason, only the signal cable for transmitting the command signal and the cable for the power source need be wired between the electric hand and the outside. Therefore, the movement of the electric hand is not limited by the cable. Moreover, the reliability of the operation of the electric hand is not reduced due to the cable being disconnected.
- the elastic change of the joint angle of the phalangeal joint 40 of the thumb 3 is limited to the bending side. Therefore, during grasping of the object, the phalangeal joint 40 of the thumb 3 is extended by the reaction force applied from the object to the fingertip, and the pressing of the thumb 3 against the object is not reduced. Therefore, the gripping force can be ensured more reliably.
- the coil spring 26 is installed so that both ends are not fixed, so that the coil spring 26 does not expand when the first drive link 21 is contracted with the compression of the coil spring 27. Even if one end of the coil spring 26 is fixed, the coil spring 26 does not extend when the first drive link 21 is contracted unless the other end is fixed. Therefore, if the coil spring 26 is installed so that at least one end is not fixed, the force necessary to elastically change the joint angle of the phalangeal joints 20 and 22 to the extension side and the joint angle to the bending side are elastic. It can be greater than the force required to change.
- the driver board 44 and the control board 45 may be provided outside the electric hand.
- the wrist motors 8 and 9 may be installed on the forearm side of the wrist unit 1 as long as a sufficient installation space can be secured on the forearm side of the wrist unit 1.
- the wrist 1 may be configured as a one-degree-of-freedom mechanism that performs only one of the pronation / extraction operation and the bending / extension operation. Further, the degree of freedom of the wrist 1 may be “0”.
- the thumb turning motor 10 may be built in the thumb 3 as long as a sufficient installation space can be secured for the thumb 3.
- the thumb 3 may be configured as a one-degree-of-freedom mechanism that performs only bending / extension operations.
- the finger motor 16 and the thumb finger motor 36 may be installed in the palm portion 2 of the electric hand.
- the joint angle can be automatically adjusted to follow the shape of the object to be grasped if the elastic member can be expanded and contracted along its axis according to the tensile and compressive loads acting on the drive links 21 and 41.
- the object can be gripped stably.
- the link mechanism that connects the middle finger joints 15 and 35 and the phalangeal joints 20, 22, and 40 is provided via coil springs 26 and 27 that are elastic members and coil springs 26 and 27.
- the first drive link 21 and the thumb drive link 41 composed of the connected first rod 24 and second rod 25 were employed, respectively.
- the lengths of the drive links 21 and 41 may be fixed if it is not necessary to adjust the joint angle following the shape of the object to be gripped.
- the human-type electric hand of the present invention is applied to an electric prosthetic hand, but may be applied to an electric hand for a humanoid robot.
- wrist motor (wrist One of two motors for inward / outward rotation and flexion / extension of the part), 10 ... finger swivel motor, 16 ... finger motor, 17 ... worm reduction mechanism, 18 ... worm, 19 ... worm Wheel (output gear), 21... First drive link (link mechanism; two connected via elastic members) Drive link), 23 ... second drive link, 24 ... first rod (one of two parts connected via an elastic member), 25 ... second rod (connected via an elastic member) One of the two parts), 26 ... coil spring (elastic member), 27 ... coil spring (elastic member), 28 ... first spur gear, 29 ... second spur gear, 36 ... thumb motor ( Finger motor), 37 ... worm reduction mechanism, 38 ... worm, 39 ...
- worm wheel (output gear), 41 ... finger drive link (link mechanism; drive link comprising two parts connected via an elastic member), 42 ... Back, 43 ... Recess, 44 ... Driver board (control board), 45 ... Control board (control board), 46 ... Hand cover, 47 ... LAN terminal, 50 ... First bevel gear (difference) Dynamic deceleration mechanism), 51 ... A bevel gear (differential reduction mechanism), 52 ... a third bevel gear (differential reduction mechanism), 53 ... a fourth bevel gear (differential reduction mechanism), 54 ... a first bevel gear (differential reduction mechanism) ), 55... Second bevel gear (differential reduction mechanism), 56.
- Third bevel gear (differential reduction mechanism), 60... First rod (of two parts connected via an elastic member) 1), 61... Second rod (one of two parts connected via an elastic member), 62... Coil spring (elastic member).
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- Heart & Thoracic Surgery (AREA)
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Abstract
Description
次に、手首部1の構成について図3を参照して説明する。
次に、手首部1の動作を説明する。上記の手首駆動機構では、手首用モーター8、9を互いに反対方向に回転させると、第4傘歯歯車53は回転せず、第2傘歯歯車51、55及び第3傘歯歯車52、56はそれぞれ同一方向に回転する。このため、手首部1は、掌部2に対して図2(b)の軸L2周りに回動する。これにより、手首部1が屈曲/伸展するように動く。
続いて、図4及び図5を参照して、示指4の構成を説明する。人間型電動ハンドでは、中指5、薬指6及び小指7は、各節の長さが異なる以外は、示指4とほぼ共通した構成を有している。
次に、示指4の動作を説明する。上述したように、中指5、薬指6及び小指7も、示指4とほぼ共通の構成を有し、それらの動作も示指4のものと同様である。
次に、拇指3の構成について図6~図9を参照して説明する。
次に、上記の拇指3の動作を説明する。
次に、人間型電動ハンドの制御部の構成を説明する。
Claims (7)
- 指を駆動するための指用モーターがウォーム減速機構に連結され、前記ウォーム減速機構の出力ギアが回動して中手指関節が屈曲/伸展し、リンク機構を介して前記中手指関節を指節関節に連結することにより、前記中手指関節の屈曲/伸展動作に連動して前記指節関節を屈曲/伸展するようにしたことを特徴とする人間型電動ハンド。
- 前記リンク機構は、弾性部材を介して連結された2つの部位からなる駆動リンクを備えていることを特徴とする請求項1に記載の人間型電動ハンド。
- 前記弾性部材として、第1の弾性部材と、第2の弾性部材とを備え、
前記第1の弾性部材は、前記指節関節の関節角度を屈曲側に変化させる方向の力が前記駆動リンクに作用することで圧縮し、
前記第2の弾性部材は、前記第1の弾性部材よりも大きい弾性率を有するとともに、前記指節関節の関節角度を伸展側に変化させる方向の力が前記駆動リンクに作用することで圧縮し、
前記第2の弾性部材は、前記第1の弾性部材が圧縮したときに伸長しないように配置されていることを特徴とする請求項2に記載の人間型電動ハンド。 - 前記電動ハンドの拇指は、旋回動作と屈曲/伸展動作とを行う2自由度の機構を有していることを特徴とする請求項1~3のいずれか一項に記載の人間型電動ハンド。
- 前記拇指の旋回動作に用いられるモーターには、各指の屈曲/伸展動作に用いられる前記指用モーターよりも最大出力の大きいモーターが採用されていることを特徴とする請求項4に記載の人間型電動ハンド。
- 前記電動ハンドの手首部は、回内/回外動作と屈曲/伸展動作とを行う2自由度の機構を有していることを特徴とする請求項1~5のいずれか一項に記載の人間型電動ハンド。
- 前記手首部の回内/回外動作と屈曲/伸展動作とは、2つのモーターと差動減速機構により行われることを特徴とする請求項6に記載の人間型電動ハンド。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/824,825 US8747486B2 (en) | 2010-09-24 | 2011-09-22 | Humanoid electric hand |
| JP2012535084A JP5787325B2 (ja) | 2010-09-24 | 2011-09-22 | 人間型電動ハンド |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-214578 | 2010-09-24 | ||
| JP2010214578 | 2010-09-24 |
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| Publication Number | Publication Date |
|---|---|
| WO2012039479A1 true WO2012039479A1 (ja) | 2012-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2011/071716 Ceased WO2012039479A1 (ja) | 2010-09-24 | 2011-09-22 | 人間型電動ハンド |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8747486B2 (ja) |
| JP (1) | JP5787325B2 (ja) |
| WO (1) | WO2012039479A1 (ja) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US8747486B2 (en) | 2014-06-10 |
| JPWO2012039479A1 (ja) | 2014-02-03 |
| US20130175816A1 (en) | 2013-07-11 |
| JP5787325B2 (ja) | 2015-09-30 |
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