Print Head Up/Down Detection Mechanism - Citizen CL-S6621 Technical Manual

2-1-5. Print Head Up/Down Detection Mechanism

The component of the print head up/down detection mechanism is as follows:
(a) SA, Head Up Switch
(b) Pop Up Cover Frame
(c) Spring Pop Up
(d) Support Pop Up
The print head up/down detection mechanism detects the up (open)/down (close) status of the
"Unit, Head".
When the "Unit, Head" is in the down position, the "Support Pop Up" (a part of the "Unit, Head")
pushes down the top of the "Pop Up Cover Frame", and the lever of the "SA, Head Up Switch" is
pushed. In this state, the "SA, Head Up Switch" turns ON and the signal line is in "Low" level.
While, the "Unit, Head" is in the up position, since the "Pop Up Cover Frame" is released from the
"Support Pop Up", it pops up by the force of "Spring Pop Up" and the switch lever is set free. In this
state, the "SA, Head Up Switch" turns OFF and the signal line is in "High" level.
The CPU on the Main PCB detects up or down position of the "Unit, Head" by sensing the output of
the "SA, Head Up Switch.
SA, Head Up Switch
Unit, Head
Support Pop Up
Pop Up Cover Frame
Spring Pop Up
["Unit, Head" Down Position]
ON
SA, Head Up Switch
["Unit, Head" Up Position]
OFF
2-13
Operation of Each Mechanism
Support Pop Up
Pop Up Cover Frame
Spring Pop Up
CL-S6621