A sewing machine (1) comprising a frame (2) onto which a main motor (3) is mounted, the latter being connected through main driving means (4) to first actuating means (5) acting directly upon stitch-building means (8). Said sewing machine (1) further comprises means for conveying a fabric (17), which shift the fabric onto which seams are made, and second actuating means (15), and it is characterized in that it comprises a secondary motor (11), which is also mounted onto the frame (2), whose operation is driven by control means (20) and secondary driving means (12) for transmitting motion from the secondary motor (11) to the second actuating means (15).