Printer with a media unit which can be removed therefrom and which is lockable

A printer for a tachograph of a motor vehicle, the printer comprising:

• a housing,
• a printing unit, having a media unit arranged to hold the medium that can be printed, the media unit is further arranged to be moved relative to the printing unit along an insertion curve describing an insertion direction into an operating position and, counter to the insertion direction, out of an operating position, the media unit further arranged to be at least partly removed from the housing and locked in an operating position in the housing (2) by means of a locking unit, the locking unit comprising, at least one movable locking element arranged to be moved into a locked position and into an unlocked position, the locking element in the locked position engaging with at least one retaining element which is fixed to the housing, and
• wherein the locking element is arranged to be moved translationally transversely with respect to the insertion direction into a locked position and into an unlocked position.