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Punch driver PCB

+24V

+5V

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Finisher controller PCB

The puncher unit is located on the feed path between the host machine and the finisher, and

successively punches holes when the paper stops temporarily. When the trailing edge of the paper
reaches the puncher unit, the inlet roller of the finisher unit temporarily stops the paper and holes are
punched on the trailing edge of the paper.

The puncher unit consists of a die and hole puncher (punch blade).
The hole puncher is driven by the punch motor (M1P). The hole puncher is attached to the

eccentric cam of the punch shaft, and rotary action of the punch shaft is converted to reciprocal
motion to perform punching.

Punch motor (M1P) is a DC motor. The home position of the punch shaft is detected by punch

home position sensor (PI3P). To stop the DC punch motor accurately at its home position, the punch
motor clock sensor (PI2P) counts a predetermined number of clock pulses to stop the punch motor. A
single punch operation is performed by rotating the punch shaft 180° from its home position.

Five light sensors (photosensor PCB) are located at the upper side of the inlet paper feed path of

the puncher unit and a set of five LEDs (LED PCB) are located at the lower side. These sensors and
LEDs function as five sensors. The frontmost sensor (LED5, PTR5) are the trailing edge sensor and
are used for detecting the trailing edge of the paper. The remaining sensors (LED1 to LED4, PTR1 to
PTR4) are horizontal registration sensors, and are used for detecting the inner position of the paper
for determining the hole punching position.

The punch motor, puncher unit and above sensors comprise the punch slide unit. This unit moves

backwards and forwards according to the size of the paper. Backward and forward movement is
driven by the horizontal registration motor (M2P). The home position of the punch slide unit is
detected by the horizontal registration home position sensor (PI1P). The horizontal registration motor
(M2P) is a 2-phase stepping motor.

The punch motor and horizontal registration motor is driven by the punch driver PCB according

to control signals from the finisher controller PCB.

Punch scraps caused by punching are stored in the punched scrap container. Scrap full detection

is performed by a reflective sensor (LED6 and PTR6 on the scrap full detector PCB unit).

Horizontal re

gistration motor (M2P) dri

ve

 signal

Punch motor (M1P) dri

ve

 signal

Punch driver PCB (1/2)

Scrap full detection signal

(LED6,PTR6) DFULL

T

railing edge detection signal

 P

AEND

Horizontal re

gistration detection signal

(LED1 to 4, PTR1 to 4) SREG1 to 4

Punch home position (PI3P)

detection signal

 PUNCHHP

Horizontal re

gistration home position (PI1P) detection signal

 SREGHP

Punch driver PCB (2/2)

Punch motor clock (PI2P)

detection signal PUNCHCLK

PTR1

LED1

2

3

4

5

2

3

4

5

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