2-8 Mechanism Configuration and Operating Principles Rev. A
The paper sensor lever can rotate freely above the upper paper guide and is in constant contact
with the paper roll, due to the internal spring pressure of the microswitch and its own weight.
Therefore, when paper is present in the paper path, the paper sensor lever contacts the paper at
an angle, as shown by the solid line in Figure 2-14, and the microswitch is on. When there is no
paper, the lever moves in the direction and the microswitch is off, so that the detection signal
is generated.
Near-end sensor assembly
The near-end sensor assembly consists of the near-end sensor lever, and a microswitch. This
assembly is mounted on the right and left sides of the lower case paper feed section and detects
the remaining amount of paper on the paper roll.
The tip of the near-end sensor lever is pressed against the side of the paper roll by the internal
spring pressure of the microswitch. Therefore, when the paper roll is full, the lever contacts the
paper at an angle, as shown by the solid line in Figure 2-15, and the microswitch is on. When the
diameter of the paper roll falls below a user-determined value, the lever moves in the
direction and drops into the paper roll core opening, so that the microswitch is off and the
detection signal is generated.
Figure 2-14. Paper Roll Sensor Assembly
Figure 2-15. Near End Sensor
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General
Weight and Dimensions
