Epson 3260 - Manual (Page 46)

4.
5.
Adjust the right sprocket unit, aligning the paper edge with
the arrow mark on the case, and lower the lock lever to lock
it in place. Then slide the left sprocket unit to match the
width of your paper, but do not lock it.
Position the paper support midway between the two sprocket
units. Open both sprocket covers
2-8 Paper Handling