Apparatus for thermographic duplication of information comprising a curve or cam member for axial movement of dye carrier

An apparatus for duplicating information from a master (M) provided with information, such as text lines or the like, comprising a drum rotatable in a stand, to which drum the master (M) with information thereon is applied, and the master (M) during rotation of the drum is exposed to directed heat radiation from one or more heat radiators and supplied to a dye-carrier rotating synchronously with the drum, which carrier comprises a dye-carrying web, the dye of which adheres to the master (M) in agreement with the information applied thereon, whereafter unprepared copy receiving sheets are contacted with the master (M) and thereafter removed therefrom, characterized in that the dye-carrier is mounted non-rotatably but movably on a drive axle supported rotatably in the stand, that it comprises a curve member changing in the direction of the drive axle, along which curve member a curve follower member runs at an angular speed in relation to the curve member equal to an entire division of the angular speed of the dye-carrier in order during one revolution of the dye-carrier to move the same on the drive axle from one position to another one, and a rotation locking device is provided to advance the dye-carrying web in co-operation with the stand upon rotation of the dye-carrier.