Figure 12. Ribbon Running Condition - AMT Datasouth CodeWriter 5106 Technical Reference

Wrinkles in the ribbon are caused by uneven tension of the ribbon within Part B.
Possible caused of uneven tension are:
The edge of the ribbon applicator does not align properly to the leading shaft. See
thermal head positioning, Step 8.
The bottom front edge of the thermal head does not align to the leading shaft.
Uneven pressure of the thermal head.
Insufficient or overload pressure of the thermal head.
Heat shrink of ribbon film.
Uneven peeling of the ribbon from media (labels).
In some cases, the ribbon condition within Part A causes problems. Possible causes are:
Leading shaft does not align to the ribbon supply shaft.
The friction brake is not strong enough to keep the tension on the ribbon in Part
A.
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Figure 12. Ribbon Running Condition