A leg assembly and a legged robot having same are provided. The leg assembly includes a first leg, a second leg, a motor, an output flange and a transmission component. The motor is arranged at a first end of the first leg, and an output shaft of the motor is connected to the output flange to drive the output flange to rotate. The first leg is pivotably connected to the second leg, and the transmission component is connected to the output flange and the second leg to drive the second leg to rotate relative to the first leg. The output flange is provided with a first limiting portion, the first leg is provided with a first stop portion and a second stop portion spaced apart and configured to stop the first limiting portion, and the first leg is provided with a second limiting portion configured to stop the second leg.

A robotic arm assembly includes a main body, a number of servos arranged within the main body, each of which has an output shaft, and a rotary connection member connected to the output shaft of one of the servos at a first end of the main body. The rotary connection member defines a through hole allows cables to pass therethrough.

A radiolucent circumduction joint that has one, two, or three degrees of axis move movement about a central point that is able to mirror human joint movement.

A method includes obtaining an implant plan, defining a range of motion for a surgical tool based on the implant plan, adjusting, by an actuator and based on the range of motion, a passive joint coupled between the actuator and the surgical tool, and allowing manual movement of the surgical tool through the range of motion via rotation at the passive joint.

Various approaches to solve for inverse kinematics may be used for teleoperation of a surgical robotic system. In one approach, an iterative solver solves for the linear component of motion independently from solving for the angular component of motion. One solver may be used to solve for both together. In another approach, all limits (e.g., position, velocity, and acceleration) are handled in one solution. Where a limit is reached, the limit is used as a bound in the intermediate solution, allowing solution even where a bound is reached. In another approach, a ratio of limits of position are used to create a slow-down region near the bounds to more naturally control motion. In yet another approach, the medical-based teleoperation uses a bounded Gauss-Siedel solver, such as with successive-over-relaxation.

A robot arm includes a first arm having a housing with a first stopper provided therein, a second arm rotating relative to the first arm, and a joint unit including an outer ring portion fixed to the second arm, a second stopper provided in the outer ring portion and restricting rotation of the second arm relative to the first arm in cooperation with the first stopper, and an inner ring portion fixed to the first arm and rotating coaxially with the outer ring portion, wherein the housing has a first opening portion opening toward the outer ring portion in a position facing the outer ring portion, and the first stopper projects from the first opening portion.

This application describes multi-stage stop devices for robotic arms. During a first stage, rotational motion of a link of a robotic arm compresses a compressible member of the multi-stage stop device to absorb and dissipate at least some of the force generated by the collision. A second stage provides a hard stop the stops any further rotation. The multi-stage stop devices described herein can include a collapsing pin configured to compress a compressible member during the first stage. After the pin has collapsed a rigid sidewall provides a hard stop preventing further rotation during the second stage.

A robot control system according to an embodiment is a control system for a robot comprising an arm, the arm being capable of holding a tool while rotating the tool and capable of moving the tool in at least two-dimensional directions, the arm being equipped with a rotating mechanism provided for the tool. The robot control system comprises a load-acquiring unit and a control-signal-generating unit. The load-acquiring unit is configured to acquire a force measured by a force sensor configured to measure a force applied from the tool to the arm during profile copying performed on a machining object by moving the arm while a copying guide attached to the arm and a copying mold placed on the machining object are kept in contact with each other. The control-signal-generating unit is configured to automatically control the arm by generating a control signal for the arm in accordance with the force acquired by the load-acquiring unit and with control information for the arm regarding the profile copying, and by outputting the control signal to the arm.

It is an object of the present invention to provide a stopper structure that can be arranged even at a position where no sufficient space can be ensured, such as at an axis at which an arm has a large operation range, and can appropriately absorb a shear load, and an articulated robot including such a stopper structure. A stopper structure according to the present invention relates to a stopper structure 100a for restricting relative rotation between an arm 120 and a mechanical element (base 110) by a predetermined angle or more, the stopper structure including: a protrusion 122 provided on one of the arm and the mechanical element; a hole 116 formed in the other one of the arm and the mechanical element; and a stopper 140 inserted into the hole while being partially exposed from the hole, wherein the stopper including: a block 150 made of an elastic resin; and a metal surface plate 160 that has a bent cross-section, and is provided on a surface of the block along a front side on which the stopper comes into contact with the protrusion.

A drawing apparatus based on a robotic arm includes a bracket, a driving device located on the bracket and a robotic arm connected to the driving device, wherein the driving device consists of two speed-reducing stepper motors, one speed-reducing stepper motor being provided with an upper arm, a tail end of the upper arm being hinged to an auxiliary arm, a tail end of the auxiliary arm being hinged to a drawing arm, the other speed-reducing stepper motor being hinged to a lower arm, a tail end of the lower arm being hinged to the drawing arm, and a head end of the upper arm and a head end of the lower arm being connected through a torsional spring.