WO2012101953A1 - 把持装置およびそれを備える移載装置、並びに、把持装置の制御方法 - Google Patents
把持装置およびそれを備える移載装置、並びに、把持装置の制御方法 Download PDFInfo
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- WO2012101953A1 WO2012101953A1 PCT/JP2011/080531 JP2011080531W WO2012101953A1 WO 2012101953 A1 WO2012101953 A1 WO 2012101953A1 JP 2011080531 W JP2011080531 W JP 2011080531W WO 2012101953 A1 WO2012101953 A1 WO 2012101953A1
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- WIPO (PCT)
- Prior art keywords
- gripping
- workpiece
- contact
- contact member
- gripping device
- Prior art date
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Classifications
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- 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
- B25J15/0004—Gripping heads and other end effectors with provision for adjusting the gripped object in the hand
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- 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
- B25J15/0023—Gripper surfaces directly activated by a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/16—Programme controls
- B25J9/1612—Programme controls characterised by the hand, wrist, grip control
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- 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
-
- 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
- B25J15/0014—Gripping heads and other end effectors having fork, comb or plate shaped means for engaging the lower surface on a object to be transported
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- 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
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- 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
- B25J15/0033—Gripping heads and other end effectors with gripping surfaces having special shapes
-
- 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
- B25J15/0052—Gripping heads and other end effectors multiple gripper units or multiple end effectors
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- 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
- B25J15/0071—Gripping heads and other end effectors with needles engaging into objects to be gripped
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- 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
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- 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
- B25J15/08—Gripping heads and other end effectors having finger members
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S901/00—Robots
- Y10S901/27—Arm part
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S901/00—Robots
- Y10S901/30—End effector
- Y10S901/31—Gripping jaw
Definitions
- the present invention relates to a gripping device, a transfer device including the gripping device, and a control method of the gripping device.
- a gripping device disclosed in Japanese translations of PCT publication No. 2008-528408 and Japanese Patent Application Laid-Open No. 9-128302 includes a contact member in which a bag-shaped member having flexibility and stretchability is filled with a large number of granular materials, and a vacuum By using a pump or the like to depressurize the interior of the bag-like member or release the depressurization, the contact member can be adapted to the outer shape of various workpieces.
- the contact member is brought into contact with a work or the like by a gripping operation, the corresponding contact member is made to follow the shape of the work or the like, and then the inside of the contact member is decompressed, The granular materials in the bag-like member are closely moored so that the shape of the contact member follows the workpiece shape. Further, by releasing the reduced pressure state in the contact member, the contact member is restored to a flexible steady state.
- the conventional gripping device when the workpiece is repeatedly gripped, if the contact position of the contact member with the workpiece is always the same, a specific part of the bag-shaped member filled with the granular material is damaged, There existed a problem that a bag-shaped member became easy to break in the said site
- the present invention provides a technique capable of extending the life of the abutting member as compared with the prior art while stably holding a plurality of types of workpieces having different shapes.
- a gripping device is attached to a gripping portion for gripping a workpiece, a control device for controlling a gripping operation of the gripping portion, and a portion of the gripping portion that comes into contact with the workpiece.
- An abutting member that deforms following the shape of the workpiece and can hold the deformation, and presses the abutting member against the workpiece by the gripping operation of the gripping portion to obtain the outer shape of the workpiece.
- a gripping device that grips the workpiece while maintaining the shape of the corresponding contact member, and the control device is configured to control the contact member when gripping the workpiece every predetermined number of gripping times. The contact position with respect to the workpiece is changed.
- the contact position of the contact member when the control device grips the work is changed in a plane perpendicular to the gripping direction. This is done by changing to a shifted position.
- the abutting member is preferably configured by filling a granular material group in a bag-like member. Furthermore, the contact member depressurizes the inside of the bag-shaped member, and increases the volume ratio of the granular material group to the internal volume of the bag-shaped member, thereby mooring each particle of the granular material group.
- the shape of the contact member is preferably maintained.
- the transfer device transfers the workpiece while holding the workpiece using the gripping device, and the relative position between the gripping device and the workpiece.
- the robot arm is adjusted, and the operation of the robot arm is controlled by the control device.
- a gripping part for gripping a work and a contact that is attached to a part of the gripping part that comes into contact with the work, deforms according to the shape of the work, and can hold the deformation. And holding the workpiece while holding the shape of the corresponding contact member while pressing the contact member against the workpiece to follow the outer shape of the workpiece by the gripping operation of the gripping portion.
- This is a method for controlling a gripping device. In the gripping device control method, the contact position of the contact member with respect to the workpiece when the workpiece is gripped is changed every predetermined number of times of gripping.
- the contact position of the contact member with respect to the work when the work is gripped is changed to a position shifted in a plane perpendicular to the gripping direction.
- the lifetime of an abutting member can be extended compared with the past, stably hold
- local damage due to wear or cutting of the contact member can be easily prevented without changing the conventional apparatus configuration.
- FIGS. 2A and 2B are schematic views showing a gripping device, where FIG. 2A is a front (XZ plane) view, FIG. 2B is a cross-sectional view along AA in FIG. 2A, and FIG. 2C is a cross-sectional view along BB in FIG.
- the figure is shown.
- It is a figure which shows the holding state of the workpiece
- (a) is a front (XZ plane) schematic diagram,
- the transfer device 15 including the gripping device 1 will be described with reference to FIGS.
- an XYZ coordinate system as shown in FIGS. 1 and 2 is defined for convenience of explanation.
- the transfer device 15 is a device used to transfer a workpiece 50, and includes a gripping device 1 and a robot arm 16.
- the transfer device 15 is used for the purpose of holding the workpiece 50 by the holding device 1 and transferring the workpiece 50 from a predetermined position to a predetermined position by the robot arm 16.
- the gripping device 1 includes a gripping portion 2, a control device 7, a vacuum evacuation equipment 8, and the like, and is disposed on the hand portion 16 a of the robot arm 16.
- the grip part 2 is a part for sandwiching and gripping the work 50, and includes a drive part 3, a plurality of claw parts 4 and 5, a plurality of contact members 6, 6, and 6 and the like.
- the drive unit 3 includes two systems of slider units 3a and 3b, and each slider unit 3a and 3b is reciprocally displaced independently in the X-axis direction.
- an electric actuator provided with a reciprocating mechanism including a ball screw / nut and a motor can be employed.
- the drive unit 3 and the control device 7 are electrically connected, and the operation of the slider units 3 a and 3 b of the drive unit 3 is controlled by the control device 7.
- claw part 4 * 5 is a pair of site
- the shapes of the claw portions 4 and 5 are set in consideration of the shape and size of the workpiece 50 to be grasped, the stroke amounts of the slider portions 3a and 3b, and the like.
- the claw portion 4 includes a support portion 4a fixed to the slider portion 3a and two clamping portions 4b and 4b protruding from the support portion 4a.
- the clamping parts 4b and 4b are arranged at a predetermined interval from each other.
- the claw portion 5 includes a support portion 5a fixed to the slider portion 3b, and one pressing portion 5b protruding from the support portion 5a.
- the control unit 7 slides the sliders 3a and 3b to reciprocate the clamping parts 4b and 4b and the clamping part 5b along the X-axis direction.
- the control unit 7 slides the sliders 3a and 3b to reciprocate the clamping parts 4b and 4b and the clamping part 5b along the X-axis direction.
- the abutting member 6 is a part that directly abuts on the workpiece 50, and has a mode in which the shape can be flexibly deformed (this mode is referred to as “softening”) and a mode in which the shape is firmly held (this mode). Is called "curing"), and two conflicting modes can be realized with one member.
- the contact member 6 is in a form that can be flexibly deformed (in a softened state).
- the abutting member 6 includes a bag-like member 6a having elasticity and a large number of granular materials (granular material group) 6b filled in the bag-like member 6a.
- the abutting member 6 is attached to the surface of the claw portions 4 and 5 on the side where the pressing portions 4b, 4b, and 5b face each other.
- the contact member 6 is connected to an evacuation facility 8 as shown in FIG.
- the evacuation equipment 8 constitutes means for hardening and softening the contact member 6 in the gripping device 1, and includes a vacuum pump 8a, vacuum pipes 8b and 8b, an electromagnetic valve 8c, and the like.
- Each vacuum pipe 8 b is connected to the bag-like member 6 a of each contact member 6.
- the vacuum pump 8a is provided in the vacuum exhaust equipment 8 is illustrated, but a configuration including exhaust means (for example, an ejector or the like) other than the vacuum pump 8a is also possible.
- the means for realizing the hardening and softening of the contact member does not necessarily need to be an evacuation facility, and various means capable of realizing the hardening and softening of the contact member.
- the thing of an aspect may be employ
- the vacuum pump 8a instead of the vacuum pump 8a, as a configuration provided with a check valve for circulating air only in the direction of discharging air from the bag-like member 6a to the vacuum pipe 8b, the inside of the bag-like member 6a by gripping operation. It is also possible to harden the contact member 6 by expelling air from the air.
- the abutting member 6 When the abutting member 6 operates the vacuum pump 8a to depressurize the inside of the bag-like member 6a, the particles constituting the granular material group 6b filled in the bag-like member 6a are more closely moored and granular. Since the object group 6b is cured, the shape of the object group 6b is firmly maintained.
- the configuration in which the contact member 6 is cured by reducing the pressure inside the bag-like member 6a is illustrated, but the configuration of the gripping device according to the present invention is not limited to this, and gripping is performed.
- Various configurations can be adopted as a configuration for curing the contact member in the apparatus.
- action of electromagnetic force may be sufficient.
- the grip portion 2 is arranged so that the position of the pinching portion 5b in the Y-axis direction is at the center of the pinching portions 4b and 4b in the Y-axis direction.
- work 50 can be firmly hold
- grip part 2 is illustrated, in the holding
- the aspect supported by the pinching part of two points which has an area, or the aspect supported by four or more points may be sufficient.
- the workpiece 50 is positioned at a predetermined position of the workpiece positioning portion 16c in a state where the workpiece 50 is positioned by positioning portions 16b and 16b including, for example, positioning pins.
- the control device 7 is connected to the robot arm 16, and information such as the arrangement / angle of the hand portion 16 a of the robot arm 16 is fed back to the control device 7.
- the gripping part 2 is placed at a predetermined position suitable for gripping the workpiece 50 by adjusting the placement and angle of the hand part 16 a by the robot arm 16. In other words, the relative positional relationship between the gripping device 1 and the workpiece 50 is adjusted by the operation of the robot arm 16.
- the arrangement of the gripping portion 2 at this time is set so that a position suitable for gripping the workpiece 50 is disposed at a position facing the contact members 6, 6, 6.
- the control device 7 receives a signal from the robot arm 16 that the grip portion 2 is disposed at a predetermined position suitable for gripping the workpiece 50.
- control device 7 adjusts the strokes of the slider portions 3 a and 3 b so that the distance between the claw portions 4 and 5 is less than the width of the workpiece 50. And the workpiece
- a command signal is given from the control device 7 to the vacuum pump 8a in a state where the work 50 is held at a predetermined holding pressure by the claw portions 4 and 5, and the inside of the bag-like member 6a of the contact member 6 Evacuate.
- the contact member 6 is cured in a state where the granular material group 6 b follows the outer shape of the workpiece 50. Since the abutting member 6 can be bitten into a predetermined part suitable for gripping the workpiece 50 and cured, the gripping portion 2 can be used even when handling a plurality of types of workpieces 50. .. Can be securely gripped without replacing the workpieces.
- the means for causing the contact members 6, 6, 6 to follow the outer shape of the workpiece 50 is configured to adjust the stroke of the slider portions 3 a, 3 b by the control device 7 (that is, this time).
- the case where the position control of the contact members 6, 6, 6 is performed) is illustrated, but the configuration of the gripping device according to the present invention is not limited to this.
- a servo current that is, a torque value in other words
- the means for reliably bringing the contact member along the outer shape of the workpiece may be configured to use both position control and torque control.
- the gripping device 1 In the gripping device 1, the contact members 6, 6... Can be cured while following the outer shape of the work 50. Even if is not constant, a stable gripping state can be maintained. Therefore, the gripping device 1 takes advantage of this feature to grip the work 50 while actively changing the contact position of the contact members 6, 6... With the work 50.
- a program for changing a predetermined gripping position as shown is incorporated in the control device 7 in advance.
- the grip portion 2 is arranged so that each of the contact members 6, 6, 6 faces the set grip position of the workpiece 50 by the robot arm 16. (STEP-4).
- the driving unit 3 Based on the command signal from the control device 7, the driving unit 3 is operated with a predetermined stroke amount, and the workpiece 50 is gripped by the gripping unit 2 (STEP-5). At this time, the control device 7 adds “1” to the value of the grip count b and counts the number of workpieces 50 gripped by the gripping members 6, 6, 6 currently attached to the grip portion 2 ( (STEP-6).
- the work 50 is transferred to a predetermined position by the robot arm 16 based on the command signal from the control device 7 (STEP-7).
- the control device 7 adds “1” to the value of the transfer number a, and counts the number of workpieces 50 transferred by the gripping device 1 (STEP-8).
- the purpose of counting the transfer number a is to prevent the contact member 6 from being damaged by preventing the contact member 6 from being damaged during the operation of the production line.
- a life based on the transfer number a is set in advance for the bag-like member 6a), and this is systematically applied before the contact member 6 breaks according to the count number of the transfer number a.
- the contact member 6 is exchanged.
- the ultimate vacuum in the bag-like member 6a when the vacuum is evacuated is detected, and when the ultimate vacuum is reduced, the life is judged to be appropriate.
- a configuration in which the contact member 6 is replaced is also possible.
- control device 7 makes a determination based on the transfer number a (STEP-9). If the transfer number a is less than a preset value, the process proceeds to the next (STEP-10) to continue the transfer operation. On the other hand, when the transfer number “a” is equal to or larger than a preset set value, the transfer operation is terminated here.
- the control algorithm in the control method of the gripping device 1 shown in the present embodiment includes an algorithm for performing determination based on the transfer number a.
- the transfer number a The structure which does not perform determination based on may be sufficient.
- the control device 7 makes a determination based on the grip count b (STEP-10). If the number of grips b is less than a preset value, the current gripping position setting is used as is, and the process returns to (STEP-4) again. On the other hand, when the grip count b is equal to or greater than a preset set value, the control device 7 changes the grip position setting (STEP-11) and returns to (STEP-3) again.
- the gripping position setting change (STEP-11) is performed by the robot arm 16 based on a command signal from the control device 7 as shown in FIG. This is done by changing the setting of direction coordinates. This is performed, for example, by shifting the arrangement setting of the grip portion 2 in the Y direction (left-right direction) and the Z direction (up-down direction) by several tens of mm. Thereby, the contact position of the contact members 6, 6, 6 with respect to the workpiece 50 is changed for each set number of grips.
- the change amount and change direction of the gripping position at this time can be appropriately set while considering not to exceed the range in which the workpiece 50 can be stably gripped by the grip portion 2.
- the gripping device 1 For example, every time the workpiece 50 is gripped by the gripping device 1 (that is, every time), the setting of a predetermined gripping position is changed, or the gripping position setting is changed after gripping three times.
- the frequency of changing the predetermined gripping position can be appropriately set according to the usage status of the gripping device 1 and the like. As a result, it is possible to prevent damage such as wear and cuts from accumulating at the same position of the contact members 6, 6, 6, thereby extending the life of the contact members 6, 6, 6.
- the contact position of each contact member 6, 6, 6 with respect to the work 50 is changed by the gripping direction ( This is performed by changing to a position shifted in a plane (YZ plane) perpendicular to the (X direction).
- the gripping position is changed by changing the arrangement of the gripping unit 2 by the robot arm 16, but the configuration of the gripping device according to the present invention is not limited to this.
- a configuration is adopted in which the gripping position is changed every predetermined number of grips by displacing the contact member every predetermined number of grips. obtain.
- the position where the workpiece 50 is gripped is changed by changing the arrangement of the grip portion 2, thereby changing the contact position of the contact member 6 with the workpiece 50. Even if the arrangement of the gripping part 2 is the same, the contact position of the contact member 6 with respect to the workpiece 50 may be changed by changing the arrangement of the claw part 4 and the claw part 5, for example.
- the slider portions 3a and 3a are controlled based on the command signal from the control device 7 in accordance with the change in the arrangement of the gripping portion 2 in the Y direction and the Z direction. It is preferable to change the displacement (stroke amount) of 3b in the X direction. Accordingly, the abutting members 6, 6, 6 can be surely aligned with the outer shape of the work 50, so that the gripping force by the gripping part 2 can be ensured.
- the present invention is applicable to a gripping device that grips a plurality of types of workpieces having different shapes.
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Abstract
Description
そこで、当接部材を交換しなくても外形形状が異なる複数種類のワークを把持することができる把持装置が種々検討されている(例えば、特表2008-528408号公報および特開平9-123082号公報)。
このような従来の把持装置では、把持動作によって当接部材をワーク等に当接させて、該当接部材をワーク等の形状に倣わせておき、その後、当接部材内を減圧することによって、袋状部材内の粒状物同士を緊密に係留させて、当接部材の形状がワーク形状に倣った状態を保持するようにしている。また、当接部材内の減圧状態を解除することによって、当接部材を柔軟な定常状態に復元させるようにしている。
さらに、前記当接部材は、前記袋状部材の内部を減圧して、前記袋状部材の内容積に対する前記粒状物群の体積比率を増大させることによって、前記粒状物群の各粒子を係留させて、前記当接部材の形状を保持することが好ましい。
また、従来の装置構成を変更することなく、簡易に当接部材の摩耗や切創等による局所的な損傷を防止できる。
尚、本実施形態で示す把持装置に対しては、図1および図2等に示すようなXYZ座標系を、説明の便宜上規定している。
駆動部3と制御装置7は電気的に接続されており、制御装置7によって駆動部3のスライダ部3a・3bの動作が制御される。
尚、各爪部4・5の形状は、把持対象となるワーク50の形状および大きさや、各スライダ部3a・3bのストローク量等を考慮して設定する。
また、爪部5は、スライダ部3bに固定されている支持部5aと、支持部5aから突設する一つの挟圧部5bを備えている。
当接部材6は、各爪部4・5において、各挟圧部4b・4b・5bが対向する側の面に付設されている。
本実施形態では、真空排気設備8に真空ポンプ8aが備えられる場合を例示しているが、真空ポンプ8a以外の排気手段(例えば、エジェクター等)を備える構成とすることも可能である。
例えば、真空ポンプ8aの代わりに、真空配管8bに袋状部材6a内から空気を排出する方向にのみ空気を流通させるための逆止弁を備える構成として、把持動作によって、袋状部材6aの内部から空気を追い出して、当接部材6を硬化させることも可能である。
また、当接部材6は、ワークの外形形状に倣わせた状態で真空排気設備8を作動させることによって、ワークの外形形状に対応した形状で硬化させ、ワークの外形形状に対応した堅固な態様の当接部材6を形成できる。
本実施形態では、把持部2によって、ワーク50を三点支持する態様を例示しているが、本発明に係る把持装置における、ワークの支持点数をこれに限定するものではなく、例えば、広い挟持面積を有する二点の挟圧部で支持する態様、あるいは、四点以上で支持する態様であってもよい。
また、制御装置7は、ロボットアーム16と接続されており、ロボットアーム16の手先部16aの配置・角度等の情報が、制御装置7にフィードバックされる構成としている。
そして、制御装置7には、ロボットアーム16から、ワーク50の把持に適した所定の位置に把持部2が配置された旨の信号が入力される。
またこのとき当接部材6は、ワーク50に対して押圧され、ワーク50の外形形状に倣って変形する。
当接部材6をワーク50の把持に適した所定の部位に食い込ませて硬化させることができるため、形状の異なる複数種類のワーク50・50・・・を取り扱う場合であっても、把持部2を交換することなく、各種類のワーク50・50・・・を確実に把持することができる。
把持装置1では、当接部材6・6・・・を、ワーク50の外形形状に倣わせた状態で硬化させることができるため、当接部材6・6・6におけるワーク50との当接位置が一定でなくても、安定的な把持状態を保持することができる。
そこで、把持装置1では、この特徴を活かして、当接部材6・6・・・におけるワーク50との当接位置を積極的に変更しつつ、ワーク50を把持するようにしており、以下に示すような所定の把持位置を変更するためのプログラムが、予め制御装置7に組み込まれている。
また、続いて制御装置7には、移載装置15によるワーク50の移載個数aの初期値(a=0)が設定され(STEP-2)、さらに、把持装置1によるワーク50の把持回数bの初期値(b=0)が設定される(STEP-3)。
このとき、制御装置7により、把持回数bの値に「1」を加算して、現状において把持部2に付設されている把持部材6・6・6によって把持したワーク50の個数をカウントする(STEP-6)。
このとき、制御装置7により、移載個数aの値に「1」を加算して、把持装置1によって移載したワーク50の個数をカウントする(STEP-8)。
移載個数aが、予め設定した設定値未満である場合には、そのまま移載動作を継続すべく、次の(STEP-10)に移行する。
一方、移載個数aが、予め設定した設定値以上である場合には、ここで移載動作を終了する。
把持回数bが、予め設定した設定値未満である場合には、現状の把持位置の設定をそのまま採用して、再び(STEP-4)に戻る。
一方、把持回数bが、予め設定した設定値以上である場合には、制御装置7により、把持位置の設定を変更する(STEP-11)とともに、再び(STEP-3)に戻る。
また、このときの把持位置の変更量や変更方向は、把持部2によってワーク50を安定的に把持することが可能な範囲を越えないよう考慮しつつ、適宜設定することができる。
これにより、当接部材6・6・6の同じ位置に摩耗や切創等のダメージが蓄積されることが防止できるため、当接部材6・6・6の寿命を延ばすことができる。
このような構成により、従来の装置構成を変更することなく、簡易に当接部材6・6・6の摩耗や切創等による局所的な損傷を防止できる。またこれにより、当接部材6・6・6の寿命を延ばすことができる。
また、本実施形態では、把持部2の配置を変更することによって、ワーク50の把持される位置を変更し、それによって当接部材6におけるワーク50との当接位置を変更する構成としているが、把持部2の配置は同じであっても、例えば、爪部4と爪部5の配置を入れ替えることで当接部材6のワーク50に対する当接位置を変更してもよい。
これにより、当接部材6・6・6をワーク50の外形形状により確実に沿わせることができるため、把持部2による把持力を確保することができる。
Claims (7)
- ワークを把持する把持部と、
前記把持部の把持動作を制御する制御装置と、
前記把持部の前記ワークと当接する部位に付設され、前記ワークの形状に倣って変形し、その変形を保持し得る当接部材と、を備え、
前記把持部の把持動作によって、前記当接部材を前記ワークに押圧して該ワークの外形形状に倣わせるとともに、該当接部材の形状を保持して、前記ワークを把持する把持装置であって、
前記制御装置は、所定の把持回数ごとに、前記ワークを把持した際の前記当接部材の前記ワークに対する当接位置を変更することを特徴とする把持装置。 - 前記制御装置による前記ワークを把持した際の前記当接部材の前記ワークに対する当接位置の変更は、前記当接部材を把持方向に垂直な平面内でずらした位置に変更することで行われる請求項1に記載の把持装置。
- 前記当接部材は、袋状部材に粒状物群を充填することにより構成される請求項1または2に記載の把持装置。
- 前記当接部材は、前記袋状部材の内部を減圧して、その内容積に対する前記粒状物群の体積比率を増大させることによって、前記粒状物群の各粒子を係留させて、前記当接部材の形状を保持する請求項3に記載の把持装置。
- 請求項1から4の何れか一項に記載の把持装置を備え、前記把持装置で前記ワークを把持した状態で当該ワークを移載する移載装置であって、
前記把持装置と前記ワークとの相対的な位置を調整するロボットアームを備え、
前記ロボットアームの動作は、前記制御装置によって制御される移載装置。 - ワークを把持するための把持部と、前記把持部の前記ワークと当接する部位に付設され、前記ワークの形状に倣って変形し、その変形を保持し得る当接部材と、を備え、前記把持部の把持動作によって、前記当接部材を前記ワークに押圧して該ワークの外形形状に倣わせるとともに、該当接部材の形状を保持して、前記ワークを把持する把持装置を制御する方法であって、
所定の把持回数ごとに、前記ワークを把持した際の前記当接部材の前記ワークに対する当接位置を変更することを特徴とする把持装置の制御方法。 - 前記ワークを把持した際の前記当接部材の前記ワークに対する当接位置の変更は、前記当接部材を把持方向に垂直な平面内でずらした位置に変更することで行われる請求項5に記載の把持装置の制御方法。
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US13/981,120 US9067324B2 (en) | 2011-01-26 | 2011-12-29 | Gripping device, transfer device with same, and method for controlling gripping device |
EP11857070.4A EP2669065B1 (en) | 2011-01-26 | 2011-12-29 | Gripping device, transfer device with same, and method for controlling gripping device |
CN201180066178.0A CN103338902B (zh) | 2011-01-26 | 2011-12-29 | 夹持装置及其控制方法、以及具备该夹持装置的移载装置 |
BR112013018876-6A BR112013018876B1 (pt) | 2011-01-26 | 2011-12-29 | dispositivo de travamento, dispositivo de transferência com o mesmo, e método para controlar o dispositivo de travamento |
PL11857070T PL2669065T3 (pl) | 2011-01-26 | 2011-12-29 | Urządzenie chwytne, urządzenie przenoszące zawierające urządzenie chwytne, oraz sposób sterowania urządzeniem chwytnym |
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PL2669065T3 (pl) | 2018-12-31 |
EP2669065A4 (en) | 2017-09-13 |
CN103338902B (zh) | 2016-08-10 |
US9067324B2 (en) | 2015-06-30 |
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