Apparatus on a spinning preparation machine, especially a flat card, roller card, cleaner or the like, with a cooling system

An apparatus on a spinning preparation machine comprising:

• a hollow roller, the roller including a first end face and a second end face opposed to the first end face to enclose the roller, wherein the first end face, the second end face, and an inner surface of the roller define an interior void space;
• a roller casing;
• a first hollow journal shaft supporting the first end face, wherein the first hollow journal shaft acts as a gas inlet for a cooling gas to enter the interior void space for cooling the roller;
• a second hollow journal shaft supporting the second end face, wherein the second hollow journal shaft acts as a gas outlet for the cooling gas to exit from the interior void space;
• and
• a carding region where carding work is carried out, and wherein the first hollow journal shaft and the second hollow journal shaft are discontinuous.