To provide an efficient printing machine that can be miniaturized and that makes power consumption low.

As shown in Fig. 3, a plurality of grooves G elongated in a circumferential direction are axially provided in a valve 52, and a circumferential phase difference between the adjacent grooves G is set to be 60 degrees. When the grooves G of the rotating valve 52 face hoses 51 and 53, air from a pump 54 is discharged from a blower nozzle 7.