Ribbon Drive Description - IBM System/32 Introduction And Maintenance Manual

4.2.27 Ribbon Drive Description
The printer uses an inked endless fabric ribbon
contained in a sealed cassette and fed by a
clutch drive mechanism. The clutch wheel is
operated by a toothed belt connected to the
type belt drive motor that advances the ribbon
only during printing.
The clutch engages by spring action and disen-
gages by solenoid action. When the solenoid
is energized (print unit closed and no print oper-
ation), the solenoid pivots the lever
g
and
compresses the spring
II
within the mech-
anism allowing the toothed section of the
clutch
B
to disengage from the drive wheel.
During printing, the solenoid is de-energized
and the spring tension engages the teeth in the
clutch to turn the ribbon drive shaft.
If]
---~P~r~b~
m
_______ -+-_.u....,.,
- - - - - - -
--+-""T""":""""r-~L-l.==.L........!-----...:-::~
Solenoid Energized
Disengaged Clutch
4-46
Solenoid De-energized
Engaged Clutch