scott russell mechanism application

The design criteria of the Scott-Russell mechanism are to achieve large amplification factor and minimum motion deviation. The flexure-based Scott-Russell mechanism can be simplified as four bar mechanism and shown in Fig. It is possible to generate an exact straight line using the slider crank mechanism but the range of motion is limited. The main arm member and the sub arm member may be pivotable about the virtual straight line as a pivoting axis thereof. In the present invention, the shape of the main arm member is a boomerang-like shape. an angle changer for changing a coupling angle between the main arm member and the sub arm member. As point A moves vertically, point B moves horizontally. Scott Russell mechanism applied to a drive structure of a feed arm. Therefore, the rotation unit attached to the joint unit via the pivoting member can displace its rotor independently of the displacement of the tip end part of the main arm member. Earlier than January, 2018 (2) Scott-Russell variation #1. Until recently, SQUSE INC., JAPAN, Free format text: A tip end part of a main arm member of a Scott Russell mechanism is enabled to be brought close to a base end part of a sub arm member. A Scott Russell mechanism is a mechanism where a linear main arm member is pivotably coupled to a sub arm member, a distance from a base end part of the main arm member to a coupling position thereof, a distance from the coupling position of the main arm member to a tip end part thereof, and a distance from a coupling position of the sub arm member to a base end part thereof are all equal to each other, and in a case where a coupling angle between both of the arm members is changed, the tip end part of the main arm member linearly moves along a straight line connecting the tip end part of the main arm member and the based end part of the sub arm member. In the present invention, the base end part of either one of the sub arm member or the main arm member is linearly movable by the second ball screw. However, a bridge-type mechanism with an external load always works in an energy-inefcient situation due to the storage of strain energy in the exural hinges, which can be validated by the analytical model established in this paper. Furthermore, in the Scott Russell mechanism device according to the present invention, a rotation unit having a rotor may be coupled to the joint unit. Further, in the Scott Russell mechanism device according to the present invention, a gripping unit may be attached to a tip end side of the pivoting unit. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASAKI, HIROMICHI;SHIMIZU, MIKIO;ICHIKAWA, YASUNORI;REEL/FRAME:031303/0520, Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY. In the present invention, the main arm member is formed into the boomerang-like shape to detour to the opposite side of the side where the sub arm member is positioned. Machines as simple as livers, machines such as James Watts steam engine and the industrial robots such as PUMA all are composed of mechanisms whether simple, complex or combination of many simple and complex mechanisms. The structural application of flexure hinges in the SR mechanism is especially important to practically play a powerful role in the positioning stage and precision cutting. Furthermore, Patent Document 4 discloses a Scott Russell mechanism applied to an industrial robot. A mechanical linkage is an assembly of systems connected to manage forces and movement. The linkage is named after John Scott Russell (1808-1882), although watchmaker William Freemantle had already patented it in 1803. A Scott Russell mechanism device is formed into a boomerang-like shape such that a main arm member coupled to a sub arm member is curved to detour a coupling position. The point A of the rhombus is connect to fixed point O2 through the link 2. Therefore, the rotation unit attached to the joint unit via the pivoting member can displace its rotor independently of the amount of the displacement of the tip end part of the main arm member, and the postural displacement of the rotor positioned at the farthest tip end increases much more. Table drive device and work system equipped with table drive device, Driving equipment and the Workpiece clamping unit equipped with the driving equipment. Further, as for the positioning transport device according to Patent Document 2, the drive structure of the feed arm according to Patent Document 3, the industrial robot according to the Patent Document 4, and the transport device according to Patent Document 5, the main arm member and the sub arm member are overlapped on and coupled to each other in a thickness direction, and thus, the tip end part of the main arm member is easily drawn proximally to the sub arm member. Further, in the present invention, the gripping unit is attached to the rotor of the rotation unit. In the present invention, the joint unit, the rotation unit, and the pivoting unit are coupled to each other in this order. Therefore, the gripping unit can be pivoted proximally to the workpiece which is the gripping target, and the Scott Russell mechanism device including a griping function suitable for such a gripping application can be provided. A pivoting axis of the pivot of the joint unit may be in parallel to an axis of the pivots of the main arm member and the sub arm member at the coupling position. Campbell, Scott SPE Disciplines. cartesian coordinate type, Programme-controlled manipulators characterised by movement of the arms, e.g. The use of flexure joints in the Scott Russell mechanism provides a number of advantages over traditional revolute joints, making it a valuable technology for use in space where maintenance is difficult and costly. Based on the geometry of the linkage the output motion is a simple sine function of the drive link or a simple harmonic motion. Therefore, even if the main arm member and the sub arm member are not arranged to offset from each other, when the coupling angle is changed so that the base end parts of both of the arm members are separated from each other, interference between the arm members at the coupling position of both of the arm members is subsided, and the tip end part of the main arm member is easily drawn close to the sub arm member. The Scott-Russell mechanismThe structural application of flexure hinges in the SR amplifying mechanism is especially important to practically play an important role in the positioning stage and precision cutting. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). US 9,505,138 B2 10 45 . The dynamic equations of a micro-positioning Scott-Russell (SR) mechanism associated with . A Scott Russell mechanism device, comprising: a sub arm member pivotably coupled to the main arm member by a coupling shaft; and. As detailed in the previous articles there are many four bar linkage based mechanisms which can generate straight lines. 33 - March 25, 2009 (40-2) - House of Commons of Canada It is possible to generate an exact straight line using the slider crank mechanism but the range of motion is limited. Specifically, the tip end part of the main arm member can be moved by only moving the base end part of the main arm member, by only moving the base end part of the sub arm member, or by moving both of the base end parts of both of the arm members, respectively. Furthermore, in the Scott Russell mechanism device according to the present invention, the angle changer may also have a second ball screw arranged in parallel to the first ball screw, and a second linearly-moving unit for being linearly moved by a rotation of the second ball screw. The locus of the straight line is the same as the travel of the slider for 90 degrees rotation of the crank. The main arm member is formed into a boomerang-like shape such that the coupling position is curved to detour to an opposite side from the side where the sub arm member is positioned. for multi-joint type robot, Gravitation balancing device, articulated robot, and wrist device for robot, Manipulator with flat or three-dimensional trajectory suitable for high operating rate, Mechanical arm with a 2 freedom-degree wrist attitude regulation mechanism, Exhaust gas purification catalyst and method for producing the same, Motor-driven device for moving workpieces, Pick and place device having two parallel axes, Scara type robot with counterbalanced arms, Manipulator, manufacturing machine and production line using the same. The resonant frequency was improved by embedding a Scott-Russell mechanism [ 31 ]. Theory of Machines and Mechanisms - John J. Uicker 2003 This work is a supplement to accompany the authors' main text. Freemantle straight-line linkage from British Patent 2741, November 17, 1803. for multi-joint type robot, Gravitation balancing device, articulated robot, and wrist device for robot, IMPROVEMENTS ON PLANE MANIPULATORS WITH FROZEN OR PROGRAMMABLE TRAVEL AT VERY HIGH RATES, Mechanical arm with a 2 freedom-degree wrist attitude regulation mechanism, Exhaust gas purification catalyst and method for producing the same, Motor driven articulated arm with cable capstan including a brake, Robot arm, robot, and robot operation method. Developed by James Watt for reciprocating piston of steam engine. This mechanism can generate an exact straight line if the link dimensions are correct. The bridge-type mechanism is one of the most widely used displacement ampliers in micro- scale applications. Application: Creates an approximate straight line if sliding along flat plane. wherein the device comprises a pivot driving unit provided at any portion from the coupling position toward the tip end side of the main arm member and for pivoting the joint unit. Echinacea, also known as Coneflower, is legendary for a reason: science has shown multiple species of Echinacea can provide potentially broad-reaching support for the innate and adaptive immune system. The degree of the curve of the main arm member may be defined such that the second section of the main arm member becomes at a substantially parallel angle to the sub arm member when the angle changer changes the coupling angle so that the base end parts of the main arm member and the sub arm member are most separated from each other. The device may include a pivoting drive source for driving the pivots of the main arm member and the sub arm member centering on the pivoting axis. In the present invention, the rotation unit is coupled to the joint unit. The distance from the pivot driving unit to the joint unit becomes closer, and the transmission mechanism regarding the drive can be coordinated compactly. KINEMATICS OF MECHANISMS FROM THE TIME OF WATT, Animation of a Scott-Russell linkage in action, https://en.wikipedia.org/w/index.php?title=Scott_Russell_linkage&oldid=1087282615, Short description is different from Wikidata, Pages using multiple image with auto scaled images, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 11 May 2022, at 14:35. Furthermore, in the Scott Russell mechanism device according to the present invention, a base end part of the main arm member and a base end part of the sub arm member that is on the opposite side from the coupling side of the sub arm member are positioned on the same virtual straight line. If you need custom mechanical parts machined - eMachineShop can help. 2- Approximate straight line mechanisms:- Modified . The present invention relates to a device applied with a Scott Russell mechanism where a main arm member and a sub arm member are coupled to each other and a coupling angle therebetween is changeable, and particularly relates to a Scott Russell mechanism device that can allow a tip end part of a main arm member to approach a sub arm member without interfering even in a case where the coupling angle of the base end parts of the main arm member and the sub arm member is changed so that the base end parts are spaced from each other, and can attach various kinds of units to the tip end side of the main arm member and change postures of the units in a wide range. Therefore, the gripping unit can be pivoted proximally to the workpiece which is the gripping target, and the Scott Russell mechanism device including a gripping function suitable for such a gripping application can be provided. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASAKI, HIROMICHI;SHIMIZU, MIKIO;ICHIKAWA, YASUNORI;REEL/FRAME:031303/0431, PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY. Since the postures of these units on the tip end side depend on the direction (posture) of the tip end of the main arm member, a problem arises that a range in which the postures of the units attached to the tip end of the main arm member can be changed is limited. [3], The linkage does not share the disadvantages of the asymmetric Panhard rod, and although more compact than Watt's linkage, it has all the forces concentrated in one link.[4]. Moreover, Patent Document 3 discloses a Scott Russell mechanism applied to a drive structure of a feed arm. The application of the Scott Russell mechanism device according to the present invention expands by attaching various kinds of units corresponding to various applications to its rotor. It is evident from the figure that this mechanism is made up of isosceles triangles, AB, AC and AO2 are of equal lengths. The Scott Russell mechanism device of. Therefore, since the rotation unit has the rotor that is rotatable independently to the displacement of the tip end part of the main arm member, the degree of freedom of the posture of the rotor of the rotation unit provided to the tip end side of the main arm member improves. Moreover, in the Scott Russell mechanism device according to the present invention, the sub arm member may be linearly formed. The linkage has a rhombic loop formed of the equal lenght members, 5, 6, 7 and 8. There are many mechanisms based on slider crank linkage which can generate exact straight lines for limited intervals. In this mechanism, the slider is replaced by a link traveling . Scott-Russell Exact Straight Line Mechanism: Scott-Russell The complexity of the mechanisms to generate exact straight lines can be reduced by introduction of one or more slider crank linkages. Priority claimed from JPPCT/JP2011/058124. Manufacturing methods for gripping devices, robot devices, control methods, control programs, recording media, and articles. The SR mechanism in combination with a parallelogram mechanism enables the achievement of a pure translation of the gripper tips, which is attractive for practical micromanipulation and microassembly applications. Assignors: ICHIKAWA, YASUNORI, SASAKI, HIROMICHI, SHIMIZU, MIKIO, HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS, MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES, Programme-controlled manipulators characterised by positioning means for manipulator elements, Programme-controlled manipulators characterised by positioning means for manipulator elements with articulated links, MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING, ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL, Gearings comprising primarily only links or levers, with or without slides, Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane, Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for conveying or interconverting oscillating or reciprocating motions, Programme-controlled manipulators characterised by movement of the arms, e.g. Further, when both of the base end parts of both of the arm members are moved in the same direction by the same amount, both of the arm members can be moved entirely while keeping their postures. Scott-Russell Mechanism. A standard Scott Russell straight- mechanism was invented by a French army officer, line mechanism provides an exact straight-line mo- Charles Nicolas Peaucellier, in 1864. Therefore, since the rotor of the rotation unit can rotate independently of the displacement of the tip end part of the main arm member, the displacement amount of the rotor of the rotation unit coupled to the tip end side of the main arm member can be increased, and the application of the Scott Russell mechanism device according to the present invention further expands. One of the ends is then connected to something that can generate linear motion, such as a rolling or sliding connection, or another straight line mechanism. Therefore, the gripping (chucking) flexibly responding to the orientation of a workpiece as a gripping target can be performed by the rotor of the rotation unit of which the amount of the postural displacement is increased, and the Scott Russell mechanism device according to the present invention can suitably be used for the gripping application. wherein a base end part of the main arm member and a base end part of the sub arm member that is on the opposite side from the coupling side of the sub arm member are positioned on the same virtual straight line, and a first distance from the base end part of the main arm member to a coupling position of the main arm member to the sub arm member, a second distance from the coupling position of the main arm member to a tip end part thereof, and a third distance from the base end part of the sub arm member to the coupling position are equal to each other. Further, when both of the base end parts of both of the arm members are moved in the same direction by the same amount, both of the arm members can be moved entirely while keeping their postures. CORROSION 2003 (1) CORROSION 2004 (1) International Petroleum Technology Conference (1) Offshore Technology Conference Asia (1) Publisher. The movement of a body, or link, is studied using geometry so the link is considered to be rigid. Thus, the degree of posturing freedom of the rotor of the rotation unit positioned to the farthest tip end increases, and the application of the Scott Russell mechanism device according to the present invention further expands. A Scott Russell linkage is a linkage which translates linear motion through a right angle. demonstrated by a study of mechanisms already in existence, such as the linkage of a retractable landing gear, computing mechanisms, mechanisms used in an automobile, and the like. Although the PA has many advantages, its main drawback is the hysteresis phenomena, which arises from material polarization and molecule friction [2]. Furthermore, in the Scott Russell mechanism device according to the present invention, the angle changer may also have a second ball screw arranged in parallel to the first ball screw, and a second linearly-moving unit for being linearly moved by a rotation of the second ball screw. Either one of the base end part of the sub arm member or the base end part of the main arm member may be pivotably coupled to the second linearly-moving unit about the virtual straight line as the pivoting axis thereof. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). an angle changer for changing a coupling angle between the main arm member and the sub arm member, wherein a joint unit is pivotably coupled to the tip end part of the main arm member, and, wherein a pivoting axis of the pivot of the joint unit is in parallel to an axis of the pivots of the main arm member and the sub arm member at the coupling position, and, a pivoting mechanism unit for automatically pivoting the joint unit cooperating with the angle change by the angle changer; and. Therefore, the rotation unit can perform the postural displacement in a different range from the case of coupling in an order different from the above, and the application of the Scott Russell mechanism device according to the present invention further expands. In the present invention, the joint unit, the rotation unit, and the pivoting unit are coupled to each other in this order. When linkage mechanisms are designed to generate exact straight lines the level of complexity increases as compared to the mechanisms designed to generate approximate straight line paths. The device may include a pivoting mechanism unit for automatically pivoting the joint unit cooperating with the angle change by the angle changer, a pivot driving unit for pivoting the joint unit via the pivoting mechanism unit independently from the angle change by the angle changer. Further, in the Scott Russell mechanism device according to the present invention, a gripping unit may be attached to the rotor of the rotation unit.