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gear rotates freely about the ribbon drive gear, and is
disengaged from the ribbon spool via the elongated slot
in the change lever, so the ribbon is no longer fed.
When the ribbon in the right ribbon spool runs short, the
ribbon reverse eyelet on the right is caught between the
eyelet control cam and the ribbon reverse arm to shift the
ribbon reverse arm from left to right.
When the ribbon reverse arm shifts, the detent spring
causes the ribbon change lever to turn from left to right.
When the pulse motor runs clockwise (carriage moves from
left to right), the ribbon gear rotates freely about the
ribbon drive gear and is disengaged as previously described.
When the pulse motor is driven counterclockwise (the carriage
moved from right to left) by the CR signal then, the ribbon gE
engages the right ribbon spool gear to turn the right ribbon
spool counterclockwise and thus feed the ribbon to the
right.
When the ribbon in the left ribbon spool runs short, the
ribbon reverse eyelet on the left is caught between the
eyelet control cam and the eyelet detector to move the
eyelet detector lever from right to left.
When the eyelet
detector lever shifts, the detent spring causes the ribbon
change lever to turn from right to left.
The above-mentioned process is repeated to feed the ribbon.
37
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