Device (105) for the alignment and feed of documents (46) along a feeding plane (10, 47) comprising a set of rollers (15) and opposed counter-rollers (14) and optical means for detecting the presence and alignment of the document (46). The optical means include light sources (59, 63) and photodetectors (61, 64) arranged on a given half plane (47) of the feeding plane, and light transmitting elements (106, 107) positioned between the light sources and the photodetectors, and associated with a guide plate (48) arranged on a half plane opposite to the feeding plane and the document (46) being adapted to interrupt the light beam between the light sources (59, 63), the light transmitting elements (106, 107), and the photodetectors (61, 64). The light transmitting elements include pre-shaped optical guides (106, 107) having ends (120a, 12b, 12a, 121b) substantially flush with a lower surface (41) of the plate guide (48).