Paper Near End Detection Mechanism - Samsung SRP-275 Service Manual

8-3-2 Paper near end detection mechanism

Paper near end detection mechanism consists of Switch-paper near end and Switch-paper near end-W
(using the wall mount). These switches detect the amount of paper left on the paper roll through OR logical
operation.
The Switch-paper near end consists of the paper near end detection lever and micro switch, and is located
on the left of the Cover base. The Switch-paper near end-W consists of the near end detection lever and
micro switch, and is located on the left of the Cover middle. These switches detect the amount of paper left
on the paper roll.
The tip of the paper near end detection lever is always pressed against the paper roll by a spring inside the
micro switch. Therefore, when there is a large amount of paper remaining on the roll, the paper near end
detection lever is pressed against the paper roll as figure.
This keeps the micro switch turned on. When the almost out of paper on the roll the tip of the paper near end
detection lever is no longer pressed against the paper roll and moves in the direction indicated by the arrow
A. This turns the micro switch off and generates a signal indicating that the paper roll is near its end.
Switch-paper near end
Switch-paper end
Frame basket
Rev. 2.00
Switch-paper near end-W
Frame basket
Switch-cover rear open
Roll paper
B
Cover base
Switch-cover rear open
Switch-paper near end-W
C
Paper inside core
A
Switch-paper near end
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SRP-275
Cover middle
Cover base
Cover middle
A