Datamax PE Operator's Manual page 24

Remove the J-Hook from the Ribbon Take-up Hub, ( as a
convenient option you may use an empty ribbon core to
rewind the spent ribbon, if using this method do not reinstall
the J-Hook).
While holding the Ribbon Take-up Hub, rotate the J-Hook to
unlatch it.
Raise the J-Hook away from the hub and place the end of the
ribbon over the take-up hub.
Figure 3-7 J-Hook
Slide the J-Hook back into place as shown in Figure 3-7.
While holding the Ribbon Take-up Hub, rotate the J-Hook
until it latches. Turn the Ribbon Take-up Hub several times
to secure the ribbon.
Lower the Head Lift Lever until the printhead is locked in the
down position.
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PE Series Operator's Manual