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F. Punch Unit (AR-PN1A/B/C/D)
(1) Basic Operations
a. Outline
The punch unit is an option, and is designed for installation to the
pickup assembly of the finisher.
The punch unit is not equipped with a paper feeding mechanism,
and the sheets from the host machine move through the punch unit
and then the feed system of the finisher. When the trailing edge of a
sheet from the host machine reaches the punch unit, the sheet is
stopped once, and the punch shaft is rotated to punch a hole along
the trailing edge. These operations are controlled with various com-
mands from the finisher controller PCB as well as the commands
from the punch controller PCB.
(2) Punching Operation
a. Outline
The punch unit is located in the pickup assembly of the finisher,
and is used to punch holes in sheets that have been sent from the
host machine and stopped inside it. When the trailing edge of a
sheet reaches the punch unit, the inlet roller of the finisher assem-
bly stops the sheet to punch a hole along the trailing edge of the
sheet.
The punch unit consists of a die and hole puncher (punch blade).
The hole puncher is driven by the punch motor (FPNM). It is
attached to the eccentric cam of the punch shaft, and the rotation of
the punch shaft is converted into reciprocating motion for punching
operation.
The punch motor (FPNM) is a DC motor. The home position of the
punch shaft is detected by the punch home position sensor
(FPHPD). To make sure that the punch motor (FPNM), which is a
DC motor, stops exactly at its home position, the punch motor
(FPNM) is stopped in relation to the count of the clock pulses kept
by the punch motor lock sensor (FPMCK). A single punching oper-
ation is executed by rotating the punch shaft 180° from its home
position.
As many as five light-receiving transistors (photosensor PCB) are
mounted over the inlet paper path of the punch unit; on the other
hand, as many as five LEDs (LED PCB) are mounted under the
path, together serving as five sensors. The frontmost sensor
(LED5, PT5) is used as a trailing edge sensor (FPTD) to detect the
training edge of sheets, and the remaining four (LED1 through
LED4, PT1 through PT4) are used as horizontal registration sen-
sors (FPSD1 through FPSD4) to detect the rear position of sheets
when punching holes.
Punch drive system
Horizontal registration
drive system
Punch controller PCB
MX-FNX2/AR-PN1/MX-RBX1 OPERATIONAL DESCRIPTION 5 – 13
The punch motor (FPNM), punch unit, and sensors make up the
punch slide unit, which moves to the front/rear to suit the selected
paper size. The movement to the front/rear is driven by the punch
horizontal registration motor (FPSM). The home position of the
punch slide unit is detected by the punch horizontal registration
home position sensor (FPSHPD), and the punch horizontal regis-
tration motor (FPSM) is a stepping motor.
The punch motor (FPNM) and punch horizontal registration motor
(FPSM) are controlled with various commands from the finisher
controller PCB as well as the commands from the punch controller
PCB. The waste paper occurring as the result of punching is col-
lected in the waste paper case. The case is monitored by the
LED121 on the waste full LED PCB and PT131 on the waste full
photosensor PCB (FPDD).
Punch controller PCB (1/2)
LED121
Punch controller PCB (2/2)
PT1
2
3
4
5
LED1
2
3
4
5
PT131
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