Panasonic Workio DP-C305, Service Manual

Page: 796 / 920

796
DP-C405/C305/C265
FEB 2008 Ver. 1.1
12.1.2.6.2. Punching Operation
1. 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 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 (M1P). 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 (M1P) is a DC motor. The home position of the Punch Shaft is detected by the Punch
Home Position Sensor (PI1P). 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 (PI3P).
A single punching operation is executed by rotating punch shaft 180° from its home position.
As many as five light-receiving transistors (Photo Sensor 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 to detect the training
edge of sheets, and the remaining four (LED1 through LED4, PT1 through PTR4) 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 (M2P). The home position of the Punch Slide Unit is detected by the Horizontal
Registration Home Position Sensor (PI2P), and the Horizontal Registration Motor (M2P) is a Stepping
Motor.
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 Photo Sensor
PCB.