2-/4-Hole Type; Punch Operation - Sharp AR-FN8 Service Manual

B.

PUNCH OPERATION

The hole puncher is driven by the punch motor (M1P). The hole puncher home position is
detected by the punch home position sensor (PI3P).
In all there are four types of puncher unit depending on the destination: 2-hole type (Puncher
unit AP-PN2AE), 2-/3-hole Dual Use (Puncher unit AP-PN2AN), and two 4-hole types (Puncher
unit AP-PN2AF and Puncher unit AP-PN2AS). With the 2-hole and 4-hole types, the hole puncher
is moved reciprocally and punching is performed by the punch shaft rotating 180° from its home
position. With the 2-/3-hole dual use type, too, the hole puncher is moved reciprocally and punch-
ing is performed by the punch shaft rotating 180° from its home position. However, half of the
peripheral area of the punch shaft can be used as a 2-hole type while the other half can be as a 3-
hole type. Whether the punch shaft is used as a 2-hole punch or a 3-hole punch depends on the
instructions from the host machine.
1.

2-/4-hole Type

At the home position, the punch home position sensor is ON. Punching of the first sheet ends
when the punch shaft has rotated in the forward direction 180° , and the state of the punch home
position sensor has changed from OFF to ON. Punching of the second sheet ends when the punch
shaft has rotated in the reverse direction 180° , and the state of the punch home position sensor has
changed from OFF to ON.
The following illustrates punching when two sheets are punched.
1) A hole is punched in the trailing edge of the first sheet.
Punch home
position sensor
(PI3P)
Eccentric
cam
Die
Die
[punch shaft stopped/
home position]
CHAPTER 4 PUNCHER UNIT (OPTION) BASIC OPERATION
Sensor flag
Punch shaft
Hole
puncher
Sheet
[punch shaft rotated 90˚
in the forward direction /
hole punched]
Figure 4-202
Punched scrap
[punch shaft rotated 180˚
in the forward direction /
punch operation completed]
4-7