Abstract: The invention relates to automatic stretchers of sleeves of knitted garments and the like, for ironing machines. These stretchers are composed of chains (1) having links (12), on one side, shaped with conventional grip teeth (13) and, on the other side, with flat surfaces (14) ending in perpendicular side ledges (15). Another feature is constituted by the fact that the chains have their ends pivoted on slides (2), mobile along the external side edges (3) of an extensible elastic frame (4), and on fixed points (5) included inside carters (6) incorporated in the frame (4). In the carters (6) are included powered cogwheels (8), which engage the chains (1).