Abstract: A yarn delivery device is provided for textile machines, particularly for air jet looms. A knotcatcher is provided with a measuring drum that reduces frictional drag on the yarn thus reducing the air requirements for pulling the yarn off the drum, reduces the wear on the yarn contact points, has longer life, and is easier to repair than conventional knotcatchers. The knotcatcher includes a circular plate having a circular axially upstanding circular rim, with a plurality of smooth-surfaced hardened steel cylindrical pins upstanding from the rim. The pins are press fit into holes formed in the rim, and if damaged may be readily replaced.