| Revision A |
Cassette 1 Paper Empty Sensor (PC22)
This sensor detects the paper empty status of the Cassette 1. The sensor uses a photointerrupter. When paper runs out in the Cassette 1, paperempty occurs.
When paper is present in the paper cassette:
The sensor arm is pressed by the paper and it is lifted. So, the projection of the sensor arm engages with the photointerrupter.
As a result, the output of the photointerrupter is “H”.
When paper runs out in the paper cassette:
The sensor arm lowers by pressing a spring so that the projection of the sensor arm comes off the photointerrupter. As a result, the output of the photointerrupter is “L”.
Sensor Arm | Cassette 1 Paper Empty Sensor |
Paper |
|
Light is blocked: | Light passes: |
Output = H | Output = L |
[Paper is present.] | [Paper empty] |
Figure 2-14. Cassette 1 Paper Empty Sensor Mechanism
Cassette 1 Paper Near Empty Sensor (PC25)
This sensor detects the paper near empty status of the Cassette 1 paper. The sensor uses a photointerrupter. As the sheets of paper in the paper cassette decrease, the paper lifting plate in the paper cassette lifts. When the paper lifting plate lifts exceeding a certain point, the Cassette 1 paper near empty occurs.
When enough paper is present in the paper cassette:
The paper lifting plate is lowered. In this condition, the projection of the sensor arm is engaged with the photointerrupter. Thus,
the output of the photointerrupter is “H”.
When the remainder of paper decreases:
The lower part of the sensor arm is pressed by the paper lifting plate and the projection of the sensor arm comes off the photointerrupter. Thus, the output of the photointerrupter is “L”.
Cassette 1 Paper Near Empty Sensor
| Paper |
| Few paper |
| Paper Lifting Plate |
Light is blocked: | Light passes: |
Output = H | Output = L |
[Paper is present.] | [Paper near empty] |
Figure 2-15. Cassette 1 Paper Near Empty Sensor Mechanism
Operating Principles | Printer Mechanism Operating Principles | 63 |
