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Lock Plat.
0
0°
Nylon Puli.y
a
0
Figure 74. Ribbon Take-up Mechanism
After the ribbon leaves the feed and pressure rollers, it is re-
wound on a large take-up spool which is mounted on the left
magazine plate. The take-up spool is driven by a spring belt
which is powered by a nylon rewind pulley fastened to the
power roll pulley. The rewind pulley supplies constant ten-
sion to the take-up spool by slipping against the spring belt
when the machine is idling, and ribbon is not feeding. When
the ribbon is fed, the spring belt uses the rotation of there-
wind pulley to drive the take-up spool.
Escapement wheels are available with tooth sizes for 6 2/5,
8, 9, 10, 12 and 14 pitch machines. The pitch number is
stamped on the side of the escapement wheel.
The pressure roller latches when it is pushed to the rear (Fi g.
73). This allows the operator tG move easily thread the rib-
bon through the guide loop and rollers. The operator then
pushes down on the latch and releases it so that the geared
rollers re-engage and hold the ribbon in a feeding position.
The outer half of the take-up spool is attached,to the inner
half by a collapsible spring that hooks behind the inner spool
when not compressed.
On machines above serial number 581357, a noiseless style of
carbon ribbon rewind has been installed (Fig. 74). The bear-
ing housing of the take-up spool is attached to the left hand
magazine plate under spring tension, in a manner permitting
vertical movement of the bearing in the magazine plate. A
large steel pulley, attached to the shaft and spool assembly,
runs directly on a rubber tire pulley mounted by a hex-headed
screw to the power roll pulley.
This rotates the take-up spool in a direction opposite to that
of previous take-up spools. Variable tension may be obtained
through adjustment of the hex-headed screw in the power roll
pulley against a spring washer. The lock plate maintains this
adjustment after it is set. The removable outside spool flange
and the collapsible spring have been changed to permit winding
the ribbon in a circular (rather than elliptical), form on the
take-up spool.
36
Machines may use either fabric ribbon or carbon paper ribbon
by utilizing a combination ribbon lift guide and both types of
comer guides. The operator must remove one ribbon from the
guides and thread the other one when wishing to change from
one ri bbon to the other.
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