Cylinder in equipment for producing printing plates

A cylinder assembly for making printing plates, comprising:

• a frame;
• a first bearing and a second bearing arranged on the frame;
• a cylinder having a first end and a second end;
• a first journal interposed between the first end and the first bearing for mounting said first end relative to said first bearing;
• a second journal interposed between the second end and the second bearing at a point of separation for mounting said second end relative to said second bearing;
• a drive mounted on the frame and acting on the first journal so as to rotate the cylinder;
• a screw element arranged in the second journal for connecting the second journal to the cylinder at the point of separation;
• a blocking device selectively movable between a coupled position and an uncoupled position, wherein said blocking device is adapted for blocking rotation of the screw element when the blocking device is in the coupled position and thereby effecting longitudinal movement of the screw element relative to the cylinder during a screwing movement of the driven cylinder;
• and
• an actuating element fixed to the blocking device, wherein the blocking device includes a claw coupling having a first coupling part with a non-rotatable claw and a second coupling part, the first coupling part and the second coupling part are configured to have a freedom of rotation of about 90° when coupled to one another, and the actuating element serves to couple the first coupling part to the second coupling part.