AR-F12 (serv.man5). Puncher unit (option) basic operation - Sharp Copying Equipment Service Manual (repair manual). Page 8

The hole puncher is driven by the punch motor (M1P). The hole puncher home position is de-

tected by the punch home position sensor (PI3P).

In all, there are four types of puncher units depending on the destination: 2-hole type (Puncher

unit AR-PN3B), 2-/3-hole Dual Use (Puncher unit AR-PN3A), and two 4-hole types (Puncher unit
AR-PN3C and Puncher unit AR-PN3D). 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 posi-
tion. With the 2-/3-hole dual use type, too, the hole puncher is moved reciprocally and punching 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.

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 shaft stopped/
 home position]

[punch shaft rotated 90˚ 
 in the forward direction /
 hole punched]

[punch shaft rotated 180˚ 
 in the forward direction /
 punch operation completed]

Sensor flag

Punch home 
position sensor

(PI3P)

Punch shaft

Eccentric 
cam

Hole 
puncher

Die

Die

Sheet

Punched scrap