Roland GR-640 User Manual page 17

Place the roll material on the shaft at the back of
the machine.
Pull the roll material out to the front of the
machine.
Release the brake, and then pass the leading edge of the roll material
between the pinch rollers and the grit rollers.
Exercise caution to prevent the
material from touching the shaft of
the pinch rollers.
The shaft is coated in grease, so
grease may be transferred from
the shaft surface to the material if
they come in contact with each
other.
1: Machine front
2: Machine back
3: Brake
4: Roll material
5: Pinch rollers
6: Grit rollers
7: Pinch roller shaft