Puncher Unit (Option) - Sharp AR-FN7 Service Manual

6. Puncher Unit (option)

A. Basic Operations
(1)Outline
The puncher unit is an option, and is designed for installation to the
pickup assembly of the finisher. The puncher unit is not equipped with a
paper feeding mechanism, and the sheets from the host machine move
through the puncher unit and then the feed system of the finisher.
When the trailing edge of a sheet from the host machine reaches the
puncher 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 commands from the finisher controller PCB as well as the
commands from the punch controller PCB.
Fig.F02-601-01
B.Punching Operation
(1)Outline
The puncher 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 puncher unit, the inlet roller of the finisher assembly 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 (PHPS). To make
sure that the punch motor, which is a DC motor, stops exactly at its home
position, the punch motor is stopped in relation to the count of the clock
pulses kept by the punch motor clock sensor (PE).
A single punching operation 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 puncher 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 to
detect the trailing edge of sheets, and the remaining four (LED1 through
LED4, PT1 through PT4) are used as horizontal registration sensors to
detect the rear position of sheets when punching holes.
The punch motor, 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 horizontal registration motor
(FPSM). The home position of the punch slide unit is detected by the
horizontal registration home position sensor (PSHPS), and the horizontal
registration motor (FPSM) is a stepping motor.
Punch drive system
Horizontal registration
drive system
Punch controller PCB
AR-FN7/PN1 OPERATIONAL DESCRIPTION 4-14
The punch motor and horizontal registration motor 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 collected 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.
Punch controller PCB (1/2)
LED121
Punch controller PCB (2/2)
Fig.F02-602-01
PT1
2
3
4
5
LED1
2
3
4
5
PT131