A print medium sheet feeding system for an ink jet prin­ter having a print head with a planar array of jets is provided by clamping the leading edge of a paper sheet after it is passed through a printing zone to a rotating assembly of parallel disks. The sheet is pulled through the printing zone by rotating a plurality of disks (14) with a clamp (50) being carried with the rotating drum (14c) formed by said disks (14). A platen (92) is pro­vided which has a flat surface in the printing zone (56) forming a tangent to the outer surface of the rotating disks (14). The sheet is initially clamped against the drum (14c) by the combination of a lever arm (80) which is selectively engageable with the drum for rotation therewith and an attached actuating arm (72) having a plate (52) which secures a sheet to the drum surface. The resulting clamp (50) rotates with the drum (14c) until the sheet passes below idler rollers which are biased against the drum surface. These rollers then hold the sheet against the drum for motion of the sheet with the drum surface. The actuating arm is released from the drum after a sheer passes below the rollers, thereby allowing any sized sheet to be fed through the system.