Abstract: An apparatus for mastering a robot includes two balls, each of which has a spherical surface configured to simultaneously contact its respective set of mutually orthogonal locating surfaces of a fixture only when the robot is in a predetermined reference position and orientation. The fixture is mounted on a pedestal of the robot base in a fixed spatial position. One of the balls is mounted for movement with a free end of an outer arm of an arm assembly of the robot. The robot also includes a wrist mechanism. A first end of the wrist mechanism is connected to the free end of the outer arm and a second end of the wrist mechanism is adapted to support a tool. The second ball is mounted for movement with the second end of the wrist mechanism.

Abstract: A three-axis wrist mechanism has first, second and third independent rotational axes with two points of mutual intersection which are offset from each other, the first axis being inclined at a fixed angle relative to at least one input drive axis of an input drive mechanism. The drive axis extends along the robot arm to which a first housing of the wrist mechanism is fixedly attached. A second housing is supported on the first housing for rotation about the first axis and a third housing is supported on the second housing for rotation about the second axis. A tool-support member having a tool-mounting surface is supported on the third housing for rotation about the third axis. Gear trains of the mechanism provide the independent rotation of the second and third housing structures and the tool support member to permit selective positioning of the tool-mounting surface in a work envelope.

Abstract: In a robot including a first robot part which pivots with respect to a second robot part about a pivotal axis, a cable routing system includes a multitude of flexible cables which are retained at spaced apart positions by first and second retainers so that the cables are spaced around the outside of a cylinder whose axis coincides with the pivotal axis. A first connector mechanism connects that first retainer to the first robot part so that the first retainer rotates with the first robot part about the pivotal axis during pivoting. A second connector mechanism connects the second retainer to the second robot part so that the second retainer is movable axially toward the first retainer against the biasing action of a spring along the pivotal axis and prevented from rotating about the pivotal axis during pivoting. Each of the retainers includes a slotted disk which separates and guides the cables.

Abstract: A robot including a balancing mechanism or balancer with a compression spring which flexes to compensate for the gravitational moment between an arm assembly and a base of the robot. The compression spring is chosen to have a force-deflection characteristic to account for the gravitational moment and the geometry of the mechanism. The arm assembly has a pivotal connection which pivotally supports the arm assembly on the base of the robot for movement about a pivotal axis. The mechanism can be adjusted for various arm assembly lengths and/or payloads. The mechanism includes a spring support, a connecting rod having a longitudinal axis and connected to the spring support for communicating motion of the spring support to the arm assembly at an attachment point offset from the pivotal axis. The resulting balancing mechanism is relatively compact, which lends itself to robotics applications where space is limited.