Timber harvester and a feeder device for it

A timber harvester (10), which includes two opposing jointed feed devices (14), stripping blades (15), and a cutting device (16), and in which the frame (21) of the feed device (14) is set on articulated arms (13), and in which the feed device (14) includes a roller chain (17) of one or more rows of links, set to rotate r ound a drive cog (24), a turning member (25), and slide guides (22, 23), which extend, on the adhesion side, over most of the length between the drive cog (24) and the turning member (25), characterized in that the slide guides are convex on the adhesion side, so that the protrusion due to the convexity is at least 1 cm, preferably 3-6 cm and the slide guides (22, 23) lie on the adhesion side between such curves Rin and Rout that are tangential to the drive roller (24) and the turning member (25) and which are defined by the formulae:

• Rout=0.6×L and Rout=2.5×L, in which L is the characteristic center distance, i.e. the distance between the centers of the drive cog (24) and the turning member (25), and the curved slide guides (22, 23) create a grip by directing the nip against the tree (I).