Stacker controlling curl

A printer (1) exits paper sheet(s) onto a table (6) where they are stacked and bound by stapler (15). Curl in the sheets is controlled by eccentric guide (9), which has a high section (9a) which moves over the sheet as they are moved across the table (by pusher 7a). The sheets are guided under clamp arm (11) by encountering the angled side (11a) of clamp arm (11). In the embodiment the sheets are first moved backward against reference wall 23 (by pusher 7b), and they are moved (by pusher 7a) under clamp arm 11 until encountering reference wall 13. The next sheet drops off of table 6 while a low section (9b) of the guide is position toward the next exiting sheet. In this manner a group of sheets is formed into a regular stack and are bound by the stapler.