Teletype 28 Manual page 93

ISS 8, SECTION 573-115•700TC
3. 16 Local Backspace Mechanism
SPACING FEED
PAWL
SPACING--""'\
DRUM
INTERMEDIATE
ARM---""'
ADJUSTING
PLATE--"'""'
STOP ARM
MOUNTING
SCREW
(Front-View)
CAMMING BAIL SPRING
Requirement
CAMMING BAIL STOP ARM
(1)
Requirement (Preliminary)
Spacing clutch disengaged, front feed
pawl in lower position, backspace bail
held operated, clutch tripped and main
shaft rotated llntil the front and rear
feed pawl tee~ are in line. Clearance
between pawl and the tooth on the
spacing drum ratchet wheel
1-------------
Min
o.
015 inch---Max
o.
035 inch
To Adjust
Position the adjusting plate on the inter-
mediate arm
in
the center of its adjusting
range. Then position the caroming bail
stop arm with its mounting screw friction
tight to meet the requirement. Tighten
screw.
(2)
Requirement (Final)
Min some
clearance between feed pawl teeth and
ratchet throughout travel of carriage
from left to right. Refine above
adjustment.
~--CAMMING
BAIL STOP ARM
~---SPACING ECCENTRIC ASSEMBLY
,----BACKSPACE BAIL
BACKSPACE
CAMMING BAIL
CAMMING BAIL SPRING
Min
1 oz ---Max 2-1/4 oz
--------i
to start
bail
moving.
(Front View)
Page 93