Abstract: A loader (1) for a printer for printing flat articles (2), this loader (1) which delimits a storage magazine (9) for the articles in the stacked condition being provided internally with a pivoting member (4) arranged to hold the articles (2) in bearing contact with a drive element (5) for discharging the articles (2) to be printed through an opening (7) provided in a wall of the magazine (1). This loader (1) is characterized in that the pivoting member (4) is provided with a counterweight (6) to form an assembly exerting a substantially constant bearing force on the article or articles (2) to be printed, this forced being self-positioning in the course of emptying the loader by moving along one of the articles to be printed in a direction generally opposite to the direction of expulsion of the articles from the loader.