Automatic desktop printer for security booklet documents, comprising: - a chassis, - a security booklet document transport mechanism, configured to automatically transport a security booklet document along a Y axis linear direction, from an entrance to an exit of the printer through a printing position, Characterized in that said transport mechanism further comprising: - a first set of at least one roller; - a casing comprising a first flat surface on which a security booklet document can slide when being gripped with said first set of at least one roller; And in that the printer further comprises: - a flattening mechanism (201, 202, 203, 204, 205), - a pair of transporting belts (106, 107), positioned downstream of the rollers in the Y axis direction, each belt being elongated along the Y axis direction and being positioned such that a security booklet document slides from the flat surface on top of the transporting belts (106, 107) when rollers are activated and grips said security booklet document, each belt being positioned on a respective side of the security booklet document; said transporting belts being configured to move the security booklet document from the entrance of the printer to its exit, through said flattening mechanism; wherein the entrance of the printer is different to its exit, - at least one printing bridge, which can move longitudinally along a pair of guiding rails (304, 305) and which comprises a set of at least one ink cartridge, a printing shaft and a printing head, wherein said printing head is - a movable printing head which can slide over said security booklet document along an X axis direction, which is perpendicular the Y axis direction, or - a standstill printing head, said standstill printing head having a printing width that is sufficient to cover the width of the page or the pages of said security booklet document Said printer further comprising: - a first electronic circuit that controls the movement of the security booklet document along the Y axis direction from the entrance to the exit of the printer; and - a second electronic circuit that controls both the movement of the printing bridge and the printing head; Wherein In a printing operation, the security booklet document is maintained in a standstill position along the Y axis, typically by stopping the rotation of the transporting belts (106, 107), thereby enabling no feeding of a second security booklet document while printing a first security booklet document. - a chassis, - a security booklet document transport mechanism, configured to automatically transport a security booklet document along a Y axis linear direction, from an entrance to an exit of the printer through a printing position, Characterized in that said transport mechanism further comprising: - a first set of at least one roller; - a casing comprising a first flat surface on which a security booklet document can slide when being gripped with said first set of at least one roller; And in that the printer further comprises: - a first set of at least one roller; - a casing comprising a first flat surface on which a security booklet document can slide when being gripped with said first set of at least one roller; - a flattening mechanism (201, 202, 203, 204, 205), - a pair of transporting belts (106, 107), positioned downstream of the rollers in the Y axis direction, each belt being elongated along the Y axis direction and being positioned such that a security booklet document slides from the flat surface on top of the transporting belts (106, 107) when rollers are activated and grips said security booklet document, each belt being positioned on a respective side of the security booklet document; said transporting belts being configured to move the security booklet document from the entrance of the printer to its exit, through said flattening mechanism; wherein the entrance of the printer is different to its exit, - at least one printing bridge, which can move longitudinally along a pair of guiding rails (304, 305) and which comprises a set of at least one ink cartridge, a printing shaft and a printing head, wherein said printing head is - a movable printing head which can slide over said security booklet document along an X axis direction, which is perpendicular the Y axis direction, or - a standstill printing head, said standstill printing head having a printing width that is sufficient to cover the width of the page or the pages of said security booklet document Said printer further comprising: - a movable printing head which can slide over said security booklet document along an X axis direction, which is perpendicular the Y axis direction, or - a standstill printing head, said standstill printing head having a printing width that is sufficient to cover the width of the page or the pages of said security booklet document - a first electronic circuit that controls the movement of the security booklet document along the Y axis direction from the entrance to the exit of the printer; and - a second electronic circuit that controls both the movement of the printing bridge and the printing head; Wherein In a printing operation, the security booklet document is maintained in a standstill position along the Y axis, typically by stopping the rotation of the transporting belts (106, 107), thereby enabling no feeding of a second security booklet document while printing a first security booklet document.