Panasonic DP-3510 Service Manual page 584

DP-3510/3520/3530/4510/4520/4530/6010/6020/6030
11.1.4.2. Punch Operation
11.1.4.2.1. Outline
The Punch Unit is located on the feed path between the Copier and the Finisher, and successively punches
holes when the paper stops temporarily. When the trailing edge of the paper reaches the Punch Unit, the
Inlet Roller of the Finisher Unit temporarily stops the paper and holes are punched on the trailing edge of
the paper.
The Punch 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 Punch 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 Sensor (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, Punch 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 Punch Trash Box. Detection of the paper scraps in the
Punch Trash Box is performed by a deflective sensor (LED6 and PTR6 on the Punch Trash Box Full
Detector PCB unit).
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Ver. 5.2 JAN 2006