Sharp AR-FN8 Service Manual page 147

CHAPTER 4 PUNCHER UNIT (OPTION) BASIC OPERATION
2) A hole is punched in the trailing edge of the second sheet.
[punch shaft stopped/
home position]
4-8
[punch shaft rotated 90˚
in the reverse direction/
hole punched]
Figure 4-203
[punch shaft rotated 180˚
in the reverse direction/
punch operation completed]