A changeable-length fourth axis of a delta robot has a first bar (82)
and
a second bar (83), which can be displaced parallel to one another in a slide
bearing (84, 85). They are connected to articulation heads (80, 81)
for leading in an incoming torque and for leading out an outgoing torque. The first
and second bars (82, 83) are arranged here such that the incoming torque
runs in a direction which is parallel to, but offset from, the direction of the
outgoing torque. This fourth axis allows precise torque transmission, but is nevertheless
of straightforward construction, has a high bending strength and relatively low
weight and can easily be cleaned by being washed down.
