Width adjustable angle bar assembly for a printing press

A width adjustable angle bar assembly for a printing press, comprising:

• a support;
• a hollow angle bar mounted on the support, said angle bar having a cavity with a central portion between a pair of opposed ends, and a plurality of openings extending through the angle bar and communicating with the cavity for passage of air through the angle bar from the cavity to a web passing over the angle bar;
• means for passing the air into the central portion of the cavity for distribution of the air by the angle bar against the web;
• a pair of blocking members slidably mounted adjacent both opposed ends of the angle bar, respectively, for blocking the passage of air from the central portion of the cavity through the openings adjacent the ends;
• and
• means for symmetrically adjusting the movement of the blocking members toward and away from each other to selectively control the number of openings adjacent the opposed ends communicating with the air passing into the central portion of the cavity.