Chuck Removal

Hi, Any tips for removing the chuck from a Progress 1S pillar drill? It has a knurled threaded ring above the chuck, which can screw up/
down by about 20mm, to tighten onto the top of the chuck or the bottom of the quill. This looks as though it could be used to remove the chuck - but is there a morse taper in the quill, or only a Jacobs taper into the chuck??
Help!
TIA, Alan.
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