A feeding unit (1) to feed a component (2) in an automatic manufacturing machine; the feeding unit (1) has: at least one holding head (4), which is designed to receive and hold the component (2); a conveyor (5) to cyclically move the holding head (4) along an application path (P); and a rotation station (S3), which is arranged along the feeding path (P) and in which the holding head (4) rotates relative to the equipment (8) and around a rotation axis (Rl) so as to vary the orientation of the component (2). The conveyor (5) has: a closed curve guide (7), which is arranged in a fixed position along the application path (P); and an equipment (8), which supports the holding head (4) and is provided with at least one slide (9), which is coupled to the guide (7) so as to freely slide along the guide (7). An actuation system (25) is provided, which controls the rotation of the holding head (4) around the first rotation axis (Rl) and has: a cam (26), which is arranged in a fixed position beside the guide (8) and along the application path (P); and a cam follower roller (27), which can be coupled to the cam (26) and is mechanically connected to the holding head (4).L'invention concerne une unité d'alimentation (1) pour alimenter un composant (2) dans une machine de fabrication automatique; l'unité d'alimentation (1) comprend : au moins une tête de maintien (4), qui est conçue pour recevoir et maintenir le composant (2); un transporteur (5) pour déplacer cycliquement la tête de maintien (4) le long d'un trajet d'application (P); et une station de rotation (S3), qui est disposée le long du trajet d'alimentation (P) et dans laquelle la tête de maintien (4) tourne par rapport à l'équipement (8) et autour d'un axe de rotation (Rl) de manière à faire varier l'orientation du composant (2). Le transporteur (5) comprend : un guide (7) incurvé fermé, qui est agencé dans une position fixe le long du trajet d'application (P); et un équipement (8), qui supporte la tête de maintien (4) et