Abstract: A knife holder unit combined with a rotary knife pair includes a frame composed of an upper frame part and a lower frame part; and an upper and a lower knife holder assembly supported in the upper and the lower frame part, respectively. Each knife holder assembly includes a bearing shaft composed of a first bearing shaft part having a longitudinal axis and an adjoining second bearing shaft part. The first bearing shaft part is received in a recess of a respective frame part for turning motions therein about the longitudinal axis. A first securing arrangement immobilizes the first bearing shaft part relative to the respective frame part. A rotary bearing surrounds the second bearing shaft part and has a rotary axis which is offset relative to the longitudinal axis to define an eccentricity therewith. A rotary knife is mounted on the rotary bearing.

Abstract: An extruder head assembly has a main stationary part adapted to be connected to a plurality of extruders, two head parts pivotal on the main part, and respective actuators associated with the pivotal head parts and having piston rods movable along respective longitudinal axes from the respective pivotal head parts to the stationary part. At least one of the actuators is mounted directly on the respective pivotal head part. Latches including interengaging formations on the stationary part and an outer end of the rod of the one actuator lock the pivotal head parts tightly against the stationary main part.