Paper Near End Detection Mechanism - Citizen CL-S6621 Technical Manual

Operation of Each Mechanism

2-1-6. Paper Near End Detection Mechanism

The component of the Paper near end detection mechanism is as follows:
(a) SA PNE Sensor (A part of the main body)
(b) Lever PNE (A part of the "Roll Paper Holder")
(c) Slider PNE (A part of the "Roll Paper Holder")
(d) Spring PNE (A part of the "Roll Paper Holder")
The paper near end sensor is used to detect a paper near end status of roll paper installed in the
printer.
The knob of the "Lever PNE" is pushed by the side of roll paper and the "Slider PNE" engages with
the "SA PNE Sensor" (fixed part on the main body). In this state, the "SA PNE Sensor"
(photointerrupter) turns OFF.
When printing proceeds and the diameter of roll paper is reduced to the preset paper near end
point, the knob of the "Lever PNE" that was pushed by the roll paper pops up, and the "Slider PNE"
comes off the "SA PNE Sensor". In this state, the "SA PNE Sensor" (photointerrupter) turns ON.
The CPU on the Main PCB detects the ON/OFF status of the "SA PNE Sensor" (photointerrupter)
and judges if the roll paper reaches the near end status.
The paper near end position can be changed mechanically by sliding the knob of the "Lever PNE"
up or down.
[Normal Status]
[PNE (Paper Near End) Status]
Roll Paper Holder
Lever PNE
Roll Paper
Spring PNE
Spring PNE
Lever PNE
SA PNE Sensor
SA PNE Sensor
Roll Paper
Slider PNE Slider PNE
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CL-S6621