Canon External 2/3 Hole Puncher-B1, Service Manual

Page: 21 / 72

Chapter 2
2-1
2.1 Basic Construction
2.1.1 Functional Construction
0023-7074
The puncher unit is optionally installed in the delivery path between the host machine and the finisher.
When the paper delivered from the host machine reaches the puncher unit, it is fed by the punch feed roller. Then when the trailing edge of the paper is detected,
the paper is tempo-rarily stopped and the punch axis rotates to punch holes in the trailing edge of the paper. These operations are controlled by the finisher controller
PCB and the punch controller PCB drives each puncher component.
F-2-1
2.2 Feed Drive System
2.2.1 Overview
0023-7075
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.
The paper delivered from the host machine is fed by the punch feed roller. The punch feed roller is driven by the punch feed motor. 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 following shows the names and functions of the motors and sensors used in punching operation:
T-2-1
T-2-2
2.2.2 Constraction of the Control System
0023-7076
The puncher unit consists of a die and hole puncher (punch blade).
The hole puncher is driven by the punch motor (M61). 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 (M61) is a DC motor. The home position of the punch shaft is detected by punch home position sensor (PI63). To stop the DC punch motor accurately
at its home po-sition, the punch motor clock sensor (PI62) 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
Motor Function
Punch motor (M61) Drives the punch unit.
Horizontal registration motor (M62) Drives the punch slide unit.
Punch feed motor(M63) Drives the punch feed roller.
Sensor Function
Horizontal registration home position sensor
(PI61) Detects the punch slide unit home position.
Punch motor clock sensor (PI62) Detects the punch motor clock.
Punch home position sensor (PI63) Detects the punch shaft home position.
Horizontal registration sensor (LED1 to
LED4,PTR1 to PTR4) Detects the position of the rear edge of paper.
Trailing edge sensor (LED5,PTR5) Detects the trailing edge of paper.
Scrap full detector sensor (LED6,PTR6) Detects the state of the punch waste case (full).
Finisher unit
control system
Feed
drive
system
Punch
drive
system
Horizontal
registration
drive
system
Punch
controller
PCB