Citizen CL-E720DT, Technical Manual

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Chapter 2 Operating Principles
2-1.
Operation of Each Mechanism
2-5
CL-E720DT
2-1-2. Media Feed/Printing Mechanism
The major components of the media feed/printing mechanism are:
(a) SA Head
(b) SA PF Motor
(c) SA Platen
(d) Gear train
By setting the head block to the down position, the media is pushed against the “SA Platen” by the
“SA Head”.
As the “SA PF Motor” (stepping motor) turns counterclockwise viewing from the right side of the
printer, the “SA Platen” turns counterclockwise via the gear train (“Gear PF1”, “Gear PF2” and
“Gear PF Idle”) and the media is fed forward by a friction force produced between the “SA Platen”
and the “SA Head”.
In the direct thermal printing, thermal paper is heated by the energized thermal elements of the “SA
Head” and printing is done.
When the “SA PF Motor” turns clockwise, the media is fed backwards .
[Right side view]
SA Head
1
2
3
4
5
6
Thermal Elements
SA PF Motor
SA Platen
Gear PF Idle
Gear PF2
Motor Gear
Gear PF1
Media