Patent ID: 8516917

Claim:
A translational branch joint for a parallel robot, the translational branch joint comprising: a swing arm; and a four-bar linkage connecting with the swing arm, the four-bar linkage comprising: two connecting bars parallel to each other; a first link member and a second link member connecting the connecting bars; and a plurality of joint members, each joint member comprising a first joint portion and a second joint portion extending from the first joint portion along a radial direction of the first joint portion outwardly, the first joint portion defining a first pivot hole along having a first axis substantially perpendicular to the connecting bars and coaxial with a longitudinal axis of the first link member, and the second joint portion defining a second pivot hole along a second axis substantially perpendicular to the first axis and the connecting bars; and a plurality of pivot shafts, wherein the first joint portions of the joint members are sleeved on ends of the first link member and the second link member, each of the first link member and the second link member is rotatably received in the corresponding first pivot hole and is rotatable about the corresponding first axes, each pivot shaft extends through a corresponding connecting bar and the second pivot hole of a corresponding second joint portion, the second joint portions of the joint members are connected to ends of the connecting bars, and each of the connecting bars is rotatable about each of the corresponding second axes.