Punch Operation - Canon 2/3 Hole Puncher Unit-A1 Service Manual

Punch Operation

The Punching is an operation performed by a punch to make specific number of holes in paper. The punch is driven by the punch
motor (M301) via a cam. Its home position is detected by the punch HP sensor 1 (PS303) and punch HP sensor 2 (PS304).
During punching, the punch motor (M301) drives to turn the cam, causing the punch to move up and down to make holes in paper.
Punch HP Sensor 1 (PS303)
Sensor Flag 1
The punch position is detected by the combination of the punch HP sensor 1 (PS303) and punch HP sensor 2 (PS304).
The following illustration shows examples of the different combinations of the sensor and cam positions.
Punch HP Sensor 1
(PS303)
Sensor Flag 1
OFF
Cam
Punch
The relationship between the sensors and punch position is shown below.
Paper
Sensor Flag 2
Punch HP Sensor 2 (PS304)
Sensor Flag 2
Punch HP Sensor 2
(PS304)
OFF
ON
Paper
[The hole is punched
when lowering the punch]
Cam
Punch
OFF
OFF
27
2. Technical Explanation
Punch Motor (M301)
Punch Motor Clock
Sensor (PS305)
ON
ON
[when rising the punch]
OFF