Teletype 28 - Page 111

ISS 8, SECTION 573-118-700TC
3.31
Power Drive Backspace Mechanism (For Fully Perforated Tape)
(Early Design) (continued)
Note: All spring tensions should be
taken with the. mechanism in unoperated
position.
FEED PAWL SPRING
FEED PAWL-1~
BELLCRANK
(D) ARMATURE BAIL SPRING
Requirement
With armature latch spring
unhooked
Min 3-1/2 oz---Max 6-1/2
to start armature moving.
(A) FEED PAWL SPRING
Requirement
Backspace mechanism in unoperated position.
r----- Min 4 oz---Max 6 oz
to start feed pawl moving.
(B) BELLCRANK SPRING
Requirement
....-----Min 9 oz---Max 12 oz
to pull spring to installed length.
(C) ARMATURE LATCH SPRING
Requirement
Min 1 oz---Max 2-1/4 oz------.
to pull armature latch spring
to installed length.
ARMATURE
LATCH SPRING
(Front View)
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