Cutter head holder of an underwater granulator

A cutter head holder for blades of an underwater granulator for granulating pellets from a plastic melt that emerges from a perforated plate into a process chamber in the housing of the underwater granulator, wherein the cutter head holder comprises:

• a. a cutter shaft coupled to a motor shaft of a motor of the underwater granulator, wherein the cutter shaft comprises:
• (i) an inner cutter shaft part, wherein the inner cutter shaft part has a blade holder securing blades to the inner cutter shaft part;
• (ii) an outer cutter shaft part at least partially disposed about the inner cutter shaft part, wherein the outer cutter shaft part and inner cutter shaft part are axially displaceable relative to one another, and wherein the cutter shaft parts are prevented from rotating relative to one another;
• and
• (iii) a front support in a forward region that faces the perforated plate of the underwater granulator so as to be axially displaceable relative to the inner cutter shaft part, wherein the front support supports the outer cutter shaft part, and wherein the outer cutter shaft part is supported to be rotatable relative to the housing of the underwater granulator by at least one rotary bearing.