Patent ID: 7607774

Claim:
A mobile telecommunications device comprising: a media feed path; an inkjet printhead for printing to a media substrate; a drive shaft for feeding the media substrate past the printhead; a media guide surface for biasing the media substrate against the drive shaft such that the media substrate slides over the media guide surface as the drive shaft feeds the media substrate past the printhead by contact friction; and, a print engine controller for operatively controlling the printhead, such that the print engine controller senses the number of complete and partial rotations of the drive shaft and adjusts the operation of the printhead in response to variations in the angular velocity of the drive shaft; wherein, the printhead, the drive shaft and the media guide surface are incorporated into a replaceable cartridge for insertion into the print media feed path within the mobile telecommunications device; the printhead has a capper assembly movable between a capped position covering nozzles of the printhead and an uncapped position spaced from the nozzles, the capper assembly being adapted for engagement a leading edge of the media substrate to move the capper from the capped position and towards the uncapped position; and the drive shaft disengages a trailing edge of the media substrate before the trailing edge is printed, the trailing edge being projected past the printhead by momentum and the capper assembly grips the media substrate after the media substrate has been printed so that the media substrate partially extends from the mobile telecommunications device in readiness for manual collection.