Epson FX-870 User Manual page 47

Using Continuous Paper
4. Slide the left sprocket approximately 12 mm (0.5 inch) from the
far left position (Use the alignment marks on the printer case.)
Push the lever back to lock it in place. Then slide the right
sprocket unit to match the width of your printer, but do not lock
it. Move the paper support so it is midway between the sprocket
units.
12 mm (0.5 inch)
5. Make sure your paper has a clean, straight loading edge. Open
the sprocket covers and fit the first four holes of the paper over
the sprocket pins.
2-14 Paper Handling