Media Offset Adjustment Mechanism - Citizen CLP-621 Technical Manual

2-1-7. Media Offset Adjustment Mechanism

The major components of the media thickness adjustment mechanism are:
(a) Head Bracket
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 Head SA
back and forth a little. By performing the head adjustment properly, optimum printing quality is
available. (When shipping, the media thickness adjustment dial is set to "1".)
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 Platen SA. This position will be set when the media thickness adjustment dial is
set to "1".
When hard media is used (tag paper):
When hard media is used, the optimum position of the thermal elements will shift toward the left a
little from the center of the Platen SA, viewing from the right side of the Platen SA. As the optimum
position varies according to the hardness of media, it is necessary to adjust the media thickness
adjustment dial from "1" to the greater number for the optimum position.
As the media thickness adjustment dial turns, the Head Adjust Lever also turns around the
supporting point. At this time, as the end "A" of the Head Bracket is inserted into the Head Adjust
Lever, the Head Bracket moves up and down. Note that the Head Bracket turns around both Head
Bushings on both sides. When the media thickness adjustment dial is set to the larger number, the
end "A" of the Head Bracket lowers more. At this time, the thermal element position shifts to the
left from the center of the Platen SA, viewing from the right side of the Platen SA.
For soft media
Bracket, Head
Thermal elements
Ribbon
Media
For hard media
SA, Head Holder (Fixed)
A
Supporting
point
SA, Head
SA, Platen
(b) Head Adjust SA
(Head Adjust Lever)
A
Media Thickness Adjustment Dial
Supporting
point
Groove
2-15
2-1. Operation of Each Mechanism
CLP-621 & CLP-631