Teletype 28 - 2.64 Ribbon Mechanism (Latest Design)

2. 64 Ribbon Mechanism (Latest Design) (For Early Design see 4.01 through 4.03)
FEED PAWL SPRING
Requirement
With rocker bail to extreme right
,...---Min 4 oz---Max 6 oz
to pull feed pawl spring to installed
length.
-
RIBBON a
REVERSING ARM /CHECK PAwi'® J
DRIVE ARM ADJUSTMENT SCREW
DRIVE
ARM
To Check
(Front View)
Position rocker bail to extreme left. Hold
the ribbon reversing arm under lower re-
versing extension of feed pawl.
(1) Requirement
Clearance between blocking edge of
ribbon reverse arm and reversing
extension of feed pawl
.._ ____ Min some
(2) Requirement
Clearance should not be so great as
to allow feed pawl to feed more than
two teeth at a time.
(3) Requirement
Feed pawl detented in both its right
and left position.
To Adjust
Position drive arm adjustable extension
lever with its mounting screw loosened.
Tighten screw.
Page 74
RATCHET WHEEL
TORQUE SPRING
Requirement
,-------Min 1 oz---Max 3 oz
applied tangentially to
the ratchet wheel to
start it to rotate.
ADJUSTABLE EXTENSION ARM
ROCKER BAIL
"'~