Teletype 28 - 3.22 Manual and Power Drive Backspace Mechanism (For Chadless Tape)

SECTION 573-118-700TC
Note: Unless otherwise specified, the following backspace adjustments apply to both
tli'e'Chadless and fully perforated tape mechanisms.
3.22
Manual and Power Drive Backspace Mechanism (For Chadless Tape)
RAKE
(1} Requirement
With rotational play in rake taken up to left, bottom surface of rake teeth should be
within 0. 040 inch of the same vertical plane as left side of punch block or slightly
to the right.----------------------------------------------------------~
To Adjust
Remove two mounting screws from rear plate. Postion rake shaft gear in relation
to gear segment. Replace mounting screws.
MOUNTING
SCREWS
(Left Side View)
(2)
Requirement
RAKE SHAFT
RAKE SHAFT
GEAR
SEGMENT
ECCENTRIC
MOUNTING
SCREW
I. FRONT
PLATE
With bellcrank spring unhooked and rake in operated position, clearance
between bottom of rake teeth and lower surface of tape slot
Min 0.007 inch---Max 0.011 inch------------~--------J
(check at no. 1 and 5 pins)
To Adjust
Loosen three mounting screws and eccentric mounting screw until friction tight.
Position front and rear plates, with bellcrank handle fully depressed, until left
edges of both plates are approximately in line with vertical plane of punch block and
clearance meets the requirement. Tighten mounting· screws and replace bellcrank
spring.
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