Basic Construction; Functional Construction; Feed Drive System; Overview - Canon External 2/3 Hole Puncher-B1 Service Manual

2.1 Basic Construction

2.1.1 Functional Construction

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.

2.2 Feed Drive System

2.2.1 Overview

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:
Motor
Punch motor (M61)
Horizontal registration motor (M62)
Punch feed motor(M63)
Sensor
Horizontal registration home position sensor
(PI61)
Punch motor clock sensor (PI62)
Punch home position sensor (PI63)
Horizontal registration sensor (LED1 to
LED4,PTR1 to PTR4)
Trailing edge sensor (LED5,PTR5)
Scrap full detector sensor (LED6,PTR6)

2.2.2 Constraction of the Control System

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
Finisher unit
control system
F-2-1
T-2-1
Function
Drives the punch unit.
Drives the punch slide unit.
Drives the punch feed roller.
T-2-2
Function
Detects the punch slide unit home position.
Detects the punch motor clock.
Detects the punch shaft home position.
Detects the position of the rear edge of paper.
Detects the trailing edge of paper.
Detects the state of the punch waste case (full).
Punch
drive
Feed
system
drive
system
Horizontal
registration
drive
system
Punch
controller
PCB
Chapter 2
0023-7074
0023-7075
0023-7076
2-1