Media Offset Adjustment Mechanism - Citizen CL-S6621 Technical Manual

Operation of Each Mechanism

2-1-8. Media Offset Adjustment Mechanism

The major components of the media thickness adjustment mechanism are:
(a) Cam Head Adjust
(b) SA Head Adjust Lever
According to the softness of media, the thermal element position is displaced from the optimum
position. The head offset adjustment mechanism is used to correct this by moving the "SA Head"
back and forth a little. By performing the head adjustment properly, optimum printing quality is
obtained. (When shipping, the Media thickness adjustment dial is set to "1" for soft media.)
When soft media is used (thin thermal paper, label paper, etc.):
When soft media is used, the optimum position of the thermal elements will be nearly right above
the center of the "SA2_ Platen". (In dial No. "1", they are aligned with the platen center.)
When hard media is used (tag paper):
When hard media is used, the optimum position of the thermal elements will shift toward the front a
little from the center of the "SA2_Platen", i.e. toward the left viewing from the right side of the
"SA2_ Platen" as shown below. As the optimum position varies according to the hardness of media,
it is necessary to adjust the Media thickness adjustment dial from "1" to up to "9" for optimum
printing. As the dial is turned (), the "SA Head Adjust Lever" swings up and down () as its
projection "A" moves along the groove of the dial.
The "Plate Holder Head" end is pinched by the "Spring Head Holder" at end "B" of the "SA, Head
Adjust Lever". (Namely, both parts are connected via the "Spring Head Holder".)
Therefore, as the "SA, Head Adjust Lever" swings up and down (), the "Plate Holder Head"
swings up and down accordingly (). With this movement of the "Plate Holder Head", the thermal
element position slightly moves back and forth against the "SA2_Platen".
For soft media
Supporting
Plate Holder Head
point
Ribbon
Media
SA2_Platen
For hard media
CL-S6621
[Right side view]
SA Cover Frame (Fixed)
B
Spring Head Holder
SA, Head
(c) Spring Head Holder
(d) Plate Holder Head
[Section "B" upside-down view]
B
SA Head Adjust Lever
B
Supporting
point
Cam Head Adjust
(Media Thickness Adjustment Dial)
2-16
Groove
A