Ricoh A151 Operating Instructions Manual page 110

USER REMARKS
To avoid problems caused by curled copies, try turning over the paper stack in
the paper tray. If there is no improvement, change to copy paper with less curl.
As a default setting, narrow margins on all four sides will not be copied as shown
illustration.
a
#
Paper feed
direction
c
a = 2.5 ± 1.5 mm
b1
b1 = b2 = 2 ± 2 mm
b1 + b2 ≤ 4
b2
c ≤ 4