The invention relates to a device (31) for processing recto / verso sheets provided with means avoiding a sheet refastening during the turning of each sheet. The device includes a path in which each sheet (37) is moved for processing, and extraction and insertion means (60) having a transfer path (46) into which at least one end of the path opens, for successively extract at least partially a sheet (37) of this path and insert it in this path. It is equipped with a member (62) provided with several asperities (63, 34) to constitute an obstacle to the engagement in the transfer path of a sheet (41) having been previously completely extracted via this transfer path ( 60). The invention applies to scanner, printer, copier or other type devices.
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