37Intermec EasyCoder 501 – Service Manual Ed. 7
Chapter 7
7. Transfer Ribbon Mechanism
7.1 Description
7.2 Ribbon Supply
Unit
The thermal transfer ribbon mechanism is standard (except on
EasyCoder 501 LinerLess which never uses thermal transfer print-
ing), but can be omitted on special order. The mechanism consists
of three main units:
• Ribbon supply unit
• Ribbon rewind unit
• Ribbon-end sensor
The ribbon unwind unit accommodates the fresh supply of thermal
transfer ribbon. Use original transfer ribbon from Intermec only.
They are specifi cally engineered for Intermec printheads.
The unit is designed to keep the ribbon tight all the time in order
to avoid wrinkling, which would ruin the printout. It consists of a
shaft on which a spool is fi tted. The spool can pivot ± 1.3º on the
shaft and the spool can be moved sideways.
It is most important that the pivoting point of the spool is centered
in relation to the ribbon width. Therefore, the shaft is provided with
six grooves which correspond to the standard widths of Intermec
transfer ribbons (see table to the left). By compressing the spool,
its snap-lock will disengage from the presently engaged groove
and it can be moved sideways to another position. Make sure that
the snap-lock has engaged a groove by trying to move the bobbin
without compressing it.
Ribbons with a width less than 60 mm (2.36 inches) can be used
provided they are wound on a core with a width of at least 45 mm
(1.77 inches).
Ribbon Width Position (groove)
60 mm (2.36 in) 1:st (innermost)
88-90 mm (3.5 in) 2:nd
110 mm (4.3 in) 3:rd
not used 4:th
not used 5:th
not used 6:th (outermost)
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