Teletype 28 - Page 106

SEC•riON 573-118-700TC
3. 26 Manual and Power Drive Backspace Mechanism (For Fully Perforated Tape) (continued)
BACKSPACE
PAWL
(A) FEED PAWL ECCENTRIC
(Preliminary)
(1) Requirement (Manual Backspace)
Wlth the backspace bellcrank assem-
bly in its operated position and the
feed wheel
detented back one space.
'"'---------------Min some---Max 0.003 inch
clearance between the backspace
ratchet tooth and the backspace feed
pawl with
all the rotational play of the
backspace ratchet taken up in a direc-
tion to make the clearance maximum.
(2) Requirement (Power Drive Backspace)
With the
backspace bellcrank assem-
bly in its operated position, the high
side of the eccentric should be in its
uppermost position.
To Adjust
Loosen the nut
post (friction tight) and
(Front View) rotate the eccentric with a hex wrench.
t
BELLCRANK
(B) ARMATURE HINGE
(Early Design)
Requirement
With armature bail spring removed, armature
held against the pole face, take up play at
hinge in a downward direction. Clearance
between the armature and magnet bracket.
r---Min some---Max 0.004 inch
To Adjust
With hinge mounting screws friction tight,
position hinge. Armature should touch front
Tighten the nut post.
Note: For de operation, the armature
should be positioned so that the side
marked "C" faces pole face of magnet
core. For ac operation, urunarked
side faces pole face of magnet core.
ARMATURE
and rear of pole face. Tighten screws and POLE
recheck adjustment.
MAGNET BRACKET EX
MOUNTING SCREWS
HINGE
Note: For latest design armature
i(JjUstments see 3.32.
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