Abstract: A sheet advancement system is provided which includes a roller arrangement having first and second rollers coupled to afford selected in-phase and out-of-phase relative rotational orientation thereof. Each roller includes a periphery with gripping and non-gripping surface regions, the gripping surface regions being configured to rotationally engage a sheet and the non-gripping surface regions being configured to clear the sheet. The rollers thus are joined in either a grip orientation wherein substantially continuous roller-directed sheet advancement is accommodated, or a pass orientation wherein the rollers permit unobstructed passage of the sheet. In the grip orientation, the rollers are out of phase, providing substantially continuous gripping region engagement of the sheet.