Intermec EasyCoder PX4i Service Manual page 65

Timing belt pulley
Slide
bearing
Flange
EasyCoder PX4i and PX6i Service Manual
Working Principles
The ribbon rewind unit is driven by the same motor that drives the platen
roller in the print unit via a belt that engages the timing belt pulley. The
torque spring allows the stepper motor to drive the rewind hub rotate
counter-clockwise only. When the media is fed back, the ribbon will not
move.
The torque spring arrangement automatically compensates for the gradu-
ally increasing diameter of the used ribbon on the rewind hub, so the
ribbon will always be fed at the same speed as the media.
Flange
Torque spring
Brake sleeve
Ball bearing
Shaft
Chapter 7 — Transfer Ribbon Mechanism
Bobbin plate
Locking
washers (x3)
Grub screw
Ball bearing
Slide bearing
Slide bearing
Bobbin
55