Sharp ER- 1074 Manual De Instrucciones página 9

4. Insert the top end of paper roll into the slit in the
spool shaft, and wind the paper two or three turns
on it. (See Fig. 4.)
Wind two or
5. Place the take-up spool on the holder. (See Fig. 5.)
6. After placing the spool on the bearing, press the
key.
This will make the paper tense.