Device for adjusting extractable jackets in flexographic machines

An adapter for flexographic machines, intended to be inserted on an inner shaft of the machine and to receive inserted thereon an extractable jacket having an inner diameter larger than the outer diameter of the shaft and carrying a print plate, for making an adjustment between said inner shaft and said extractable jacket, having two end portions and comprising:

• two rigid rings, each rigid ring being situated at one of the end portions of the adapter;
• a first inner cylindrical member mutually connecting said end rings, said first inner member being rigid, thin and capable of expansion and being intended to rest on said shaft;
• a second external cylindrical member mutually connecting said end rings, said second external member being rigid, forming the outer surface of the adapter and being intended to receive a jacket inserted thereon;
• expansion means provided for securing said end rings to said shaft;
• and openings provided in said second external member for allowing blowing compressed air intended to make easier the insertion and extraction of said jacket with respect to said second esternal member.