Epson 1170 - Manual (Page 87)

Cut-Sheet Feeder
7.
If you are loading envelopes, push the envelope levers back.
8. Push the paper-set levers back to clamp the paper or envelopes
against the guide rollers.
Note: You can also insert single sheets using the front paper slot
or the slot between the paper guide and stacker.
The cut-sheet feeder automatically loads paper when you send
print data to the printer (as long as the PAUSE light is not lit). You
can also load paper from the cut-sheet feeder by pressing the
LOAD/EJECT
button.
4-8 Using the Printer Options