Cutter hub holder

A cutter hub holder for blades acting in conjunction with a die plate of an underwater pelletizer which comprises a blade holder drivingly connected to a driven shaft and biased axially toward the die plate at a variably controlled fluid pressure, said blade holder also biased toward the die plate by a resilient device, said resilient device being biased in relation to the die plate by said variably controlled fluid pressure for controlled variation in the pressure exerted on the blade holder toward the die plate, said driven shaft being provided with an axial bore having one end connected to a source of fluid pressure controlled by a pressure regulator, said bore at an opposite end including a piston and piston rod slidable in the bore and engaging said resilient device for exerting a variably controlled force on the blade holder.

A quick connect and disconnect coupling between a blade holder drivingly connected to a driven shaft and biased axially toward a die plate of an underwater pelletizer which comprises a tubular member connected with the blade holder and telescopically engaged with the driven shaft, said quick connect and disconnect coupling comprising a bayonet coupling of the tubular member with the driven shaft to enable quick replacement of the blade holder.

In an underwater pelletizer having an adjustable cutter hub holder axially movably and drivingly connected between a cutter hub having cutter blades mounted thereon and a driven shaft, said driven shaft including a through bore connected with a variable controlled source of pressure to bias the cutter hub and cutter blades toward a die plate of said underwater pelletizer, said variable controlled source of pressure including a spring in said through bore and a regulated source of pressure communicated with said through bore and varying the biasing force exerted by said spring to bias the cutter hub and cutter blades toward a die plate of said underwater pelletizer.

A cutter hub holder for blades acting in conjunction with a die plate of an underwater pelletizer comprising a blade holder drivingly connected to a driven shaft, a spring extending axially of said driven shaft and biasing said blade holder axially toward the die plate, a variably controlled source of fluid pressure exerting an axial force on said spring and exerting a variable controlled axial biasing force through said spring toward said blade holder.

An underwater pelletizer which comprises a cutter hub holder rotatably supporting a plurality of cutter blades to cut a series of strands extruded from orifices in a die plate, a drive shaft driving said cutter hub holder and having an axial bore therethrough, a movable piston received in said drive shaft axial bore and operatively connected with said cutter hub holder, and a source of variably controlled fluid pressure connected to apply pressure to said piston to adjust axial bias of said cutter hub holder with respect to the die plate.

In an underwater pelletizer, the combination comprising a cutter hub holder rotatably supporting cutter blades acting in conjunction with a die plate of an underwater pelletizer including a blade holder axially movable and rotatably drivingly connected to a driven shaft and adapted to be biased toward the die plate, and a driven shaft including a through bore and having a driven end remote from said blade holder connected to a regulated source of variable controlled fluid pressure through a rotatable connection to supply variable controlled fluid pressure to said through bore to bias said blade holder axially in relation to said die plate, and a piston positioned and movable axially in said through bore in response to said variable controlled fluid pressure for biasing the blade holder in relation to the die plate.