Epson 1170 - Manual (Page 83)

Cut-Sheet Feeder
2. Slide the left paper guide so it is aligned with the triangle
mark. Next, slide the right paper guide to roughly match the
width of your paper. Slide the paper support midway between
the paper guides.
3. Pull the paper-set levers all the way forward until the paper
guides retract and lock open.
4. Take a stack of paper and fan it. Next, tap the side and bottom
of the paper on a flat surface to even up the stack.
4-4 Using the Printer Options