Ribbon Feed Mechanism - Intermec EasyCoder PC4 Service Manual

Chapter 4—Print Frame

4.8 Ribbon Feed Mechanism

Description
Ribbon Supply
Ribbon supply shaft
28
Though the ribbon feed mechanism is not available as spare parts, it is still
appropriate to descibe how it works. Since it is factory-adjusted, please
refrain from dismantling it on your own.
The ribbon mechanism consists of four different elements, all of which are
attached to the print frame moulding:
• Ribbon supply
• Ribbon core holders
• Ribbon takeup
• Ribbon takeup drive train
In the illustrations that follow, all other parts have been omitted to give a
clearer view.
The ribbon supply mechanism breaks the rotation of the ribbon supply
spool in order to keep the ribbon tight using a spring-loaded friction cou-
pling. Another spring dampens sudden jerks. The friction is affected by the
position of the fixed holder along the ribbon supply shaft.
If you need to dismantle this assembly, make sure that the ends of the short
spring fit into the holes in the ribbon return cap and friction plate and
rotate the ribbon return cap so the hook that holds the long spring passes
the 12 o'clock position (see the arrow). When fitting back the fixed holder,
make sure that the screws hit the indents in the ribbon supply shaft, that
was made when the printer was assembled at the factory.
Spring
StarLoc washer
Ribbon return cap
Spring
Friction plate
Wool fiber disc
Fixed holder
Intermec EasyCoder PC4—Service Manual
Screws (2)