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Reversing Latch
Ribbon Feed Bel/crank
Ribbon Feed Plate
lug Fastened To End Of Shaft
Figure 70. Ribbon Feed
The ribbon feed cam engages the power roll and raises the cam
frame on its mounting stud on the left side frame. This motion
is transmitted by the cam link to the shaft of the ribbon lift
bail assembly. The cam link is attached to the cam frame and
to a lug on the left end of the shaft. There are lugs attached
to both ends of the shaft, and they pass through arc-shaped
holes in the side frames. These lugs and the shaft transfer the
motion of the ribbon feed cam to the ribbon feed links (Fig. 69).
The ribbon feed links rotate the ribbon feed bellcranks which
carry the ribbon feed pawls (Fig. 70). One feed pawl is en-
gaged with a ribbon spool while the other feed pawl is held
disengaged. Motion is transmitted so that a feed pawl rotates
its spool past its check pawl and feeds the ribbon in one di-
rection.
As
the feed pawl restores to its rest position, the check
pawl prevents the ribbon spool from following the feed pawl.
Ribbon Reverse
Reversing the direction of the ribbon feed"requires an auto-
matic disengagement of the feed and check pawls from the
feeding side and an engagement of the feed check pawls with
the supply spool. The engagement ofthe pawls is controlled
by two reverse plates mounted on the ribbon feed plates (Fig.
70). When a reversing plate is in its upper position, the pawls
on that side are engaged; when a plate is down, it holds the
pawls out of engagement with the spool. The reversing p'lates
are positioned by the ribbon reverse rod which extends across
the machine from one plate to the other. If one reverse plate
is moved, the motion is transmitted through the ribbon reverse
rod to position the other plate at the same time. Thus, as one.
side becomes the feeding side, the other side becomes the
34
supply side, and vice-versa
As
the supply spool becomes empty, the ribbon becomes taut
and pulls the ribbon reverse lever, on the supply side,(Fig. 71)
Figure 71. Ribbon Revers e
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