Abstract: A device for marking of comparatively stiff, bendable sheets (21) by of a stationary write head (3), which sheets are displaceable relative to the write head (3) along a linear guiding path (12, 13), comprising a feeding device (27) for feeding the sheets one at time from a magazine (9). The sheets (21) are arranged to cooperate with a guiding member (17) movable to-and-fro in the longitudinal direction of the guiding path (12, 13) by the driving device (28). The feeding device (27) has a sliding track (8) which inclines against the guiding path (12,13) and arranged in connection to the magazine (9). In the extension of the sliding track (8) above the guiding path (12, 13) there is arranged a driving wheel (24) for feeding the front edge of the sheets (21) along the guiding path until the rear edge of the sheets leave the sliding track and are completely located on the guiding path and in cooperation with the guiding device (17).