Rolling guide with zero clearance
has realized high rigidity and high precision.
Joints with multiple degrees of freedom essential
to parallel mechanism have conventionally obtained 2~3 degrees of freedom
by combining rotational joints.
However, these joints have been characterized by upsizing due to complex
Sliding spherical joints with multiple degrees of freedom have also
been available, however, they have had large frictional resistance and
In order to resolve these problems, HEPHAIST SEIKO has developed rolling
Spherical Rolling Joint.