Patent ID: 7909454

Claim:
An inkjet printing press including a rotary printing drum and an inkjet head provided at an outer periphery of said printing drum and having nozzles through which ink is jetted against a sheet held on the peripheral surface of said printing drum for printing, wherein said printing drum is provided with a sheet holding mechanism for holding a leading end of the sheet on said printing drum, clamps which can be opened and closed for pressing a trailing end of the sheet against the peripheral surface of said printing drum, a clamp opening/closing mechanism for opening and closing said clamps, a position changing mechanism for adjusting the positions of said clamps in cooperation with said clamp opening/closing mechanism circumferentially of said printing drum according to the position of the trailing end of sheets having different lengths, and an attracting force producer for producing a force for attracting said clamps together with the trailing end of the sheet to the peripheral surface of said printing drum, wherein assuming that K is the sheet holding force of said sheet holding mechanism, M is the sliding frictional force between said clamp and the sheet, and D is the sliding frictional force between the sheet and the surface of said printing drum, the relation K>M>D is met.