To efficiently control the action of a conveyer roller pair in the case where timings when the plurality of conveyer roller pairs grip and release a recording material overlap.

The conveyer roller pairs 30, 31 are composed of capstan rollers 33, 35 and nip roller 34, 36 respectively. The nip rollers 34, 36 can move between a grip position and a release position. When movement timings of the nip roller 34, 36 overlap, drive of a pulse motor 55 is kept driven. For example, the drive pulse speed to the pulse motor 55 at a time when the nip roller 36 on a downstream side need to be moved toward the gripping position (after time T2 after a position sensor 64 detects a record sheet 24) is detected. Drive pulse speed is increased and decreased according to the detected drive pulse speed to drive the pulse motor 55 at a speed S2.