Teletype 28 - Page 107

ISS 8, SECTION 573-118-700TC
3.27 Power Drive Backspace Mechanism (For Fully Perforated Tape) (continued)
POLE FACE LATCH EXTENSION
@
(B) DRIVE LINK (Early Design)
Requirement
With high part of eccentric arm in left-
hand position, armature against pole
face to allow drive arm latchlever to
rest against eccentric link.
Min 0.040 inch---Max 0.045 inch
clearance between step on eccentric
arm ·and latchlever with play taken up
to make gap a maximum.
To Adjust
With drive arm screw friction tight,
position adjusting link. Tighten screw .
•
(A} ARMATURE UPSTOP (Early Design)
Requirement
Armature in unoperated position.
Gap between armature and pole face
------ Min 0.025 inch-- -Max 0.030 inch
at closest point.
To Adjust
Rotate eccentric with mounting nut
loosened. Keep high part of eccen-
tric to left. Tighten nut.
Note: Adjustments (A) and (C) should not
be disrurbed unless a reassembly of the
unit is undertaken. If necessary to make
these adjustments the punch unit must be
removed. See Disassembly and Reassembly
Section 573-118-702TC.
/DRIVE LINK
-ADJUSTING LINK
DRIVE ARM SCREW
LATCH
HIGH
PART OF
ECCENTRIC (To Left)
LATCH EXTENSION
ARMATURE BAIL EXTENSION
~W,..'t{~~~---=:~~MAGNET ASSEMBLY MOUNTING SCREWS
I I ·- - "'--MAGNET ASSEMBLY
(Front View)
·(C) LATCH EXTENSION (Early Design)
Requirement
With backspace mechanism in unoperated position, eccentric high part at the left, armature
against the pole face, latch resting on the eccentric arm notch, clearance between top of
armature bail extension and latch extension
"------Min 0.005 inch---Max 0.020 inch
To Adjust
With magnet ~c;sembly mounting screws friction tight, swing magnet left or right.
Tighten screws.
Page 107