Pen type multi-color recording device

A recording device for recording data in any of a plurality of colors, including a carriage having a rotary drum carrying a plurality of recording pens spaced around the periphery of said drum and capable of writing in respective colors, means for moving said carriage across the path of movement of a recording paper through a printing region opposite said recording paper and a pen-selecting region adjacent said printing region, pen-selection means for rotating said drum when said carriage is in said pen-selecting region to bring a selected pen into a printing position and for holding said drum against rotation when said carriage is in said printing region, and means carried by said carriage for urging the pen in said printing position outward into contact with said printing paper, said pen-selection means including a cam mounted for rotation with said drum and having a plurality of teeth engaged by a stationary projection during movement of said carriage in said pen-selecting region whereby said drum can be rotated to bring a selected pen into the printing position by reciprocating said carriage within said pen-selecting region.