Teletype 28 - General; Perforated Tape

SECTION 573-118-700TC
CONTENTS
Noninterfering BLANK Tape Feed
Out Mechanism
PAGE
Artnature hinge . • • • • • • • • • • • • • • 164
Armature locklever spring • • • • • • • 169
Armature spring . . • • • • • • • • • • • • 164
Contacting mounting bracket . • • • • • 173
Contact lever ....• ·• . • • . • • • • • • • 173
Contact lever spring. . . . • • . • • • • • 173
Contact pulse closure . • . • . • • • • • • 173
Contact springs . . . . • . • • • • • . • • • 172
Drive arm. . . . . . . . . . . . . • • • • • • 161
Drive arm shaft rear bearing. • • • • • 161
Drive arm spring. . • . • . • • • • • • • • 171
Feed out bracket . • . • • . • • . • • • • • 161
Feed out pawl . • • . . • • • • • • • • • • • 163
Feed out pawl spring . • • • • • • • • • • 163
Feed out switch . . . • • . • • • • • • • • • 174
Feed out switch (with pulse closure). • 175
Inner ratchet check pawl . • . • • • • • • 167
Inner ratchet check pawl spring . • • • 167
Kick-out arm . . . . . . • • • • • • • • • • 169
Latch arm spring. . • • • . • . • • • • • • 169
Lifter lever. . . . . . . • • • • • • • • • • • 166
Magnet mounting bracket . • • • • • • • • 164
Metering feed pawl spring . • • • • • • • 166
Noninterfering clamp arm . . • • • • • • 168
Outer ratchet check pawl spring . • • • 166
Outer ratchet return spring . • • • • • • 168
Release arm . • . . . . • • . • • • • . • • • 162
Release arm latch . • . • • • • . • • • • • 165
Release arm latch spring. . • . • . • • • 165
Release arm spring . • • . • • . • • • • • 171
Switch
lever adjusting bracket . • • . • 175
Switch
lever spring . . • . • . • • . • • • 174
Tape length adjusting plate. • • • • . . . 170
Ribbon
Feed Mechanism for
Chadless Tape and Fully
Perforated Tape
Ribbon feed drive arm spring. • • • • • 157
Ribbon
feed eccentric stud. . • • • • • • 156
Ribbon
feed pawl downstop
eccentric . . • • • . • . • • . • • • • • • • • 157
Ribbon
feed pawl spring . . • • • • • • . 156
Ribbon feed
reversing arm spring. • • 158
Ribbon
ratchet wheel spring
washers .. . . . . .. . . . . • . • • . • • • . . 157
Ribbon reversing plate . . • • • • . • • • 158
Signal Bell Contact Mechanism
Contact mounting bracket. . • • • • • • . 159
Fw1ction
blade spring . • • . • • • • • • • 159
Page 6
1. GENERAL
1. 01 This section contains the specific re-
quirements and adjustments for the 28
typing
reperforators and tape printers.
1. 02 This section has been revised to include
recent engineering changes and additions,
and to rearrange the text, so as to bring the sec-
tion generally up-to-date. Since this is an ex-
tensive revision, marginal arrows ordinarily
used to indicate changes have been omitted.
Note: Remove power from set or unit before
iiiiking adjustment.
1. 03 Maintenance procedures which apply only
to
mechanisms of a particular design, or
to certain models of 28 typing reperforators and
tape printers are so indicated in the titles of the
paragraphs which contain these particular ad-
justment requirements.
1. 04 The adjustments are arranged in a se-
quence that should be followed if a com-
plete readjustment of the unit were undertaken.
The tools and spring scales required to perform
these adjustments are listed in the applicable
section. After an adjustment is completed, be
sure to tighten any nuts or screws that are
loosened. The adjusting illustrations indicate
tolerances, positions of moving parts, spring
tensions and the angles at which scales should
be applied when measuring spring tensions. If
a part mounted on shims is removed, the number
of shims used at each of its mounting screws
should be noted so that the same number is re-
placed when the part is remounted.
1. 05 After a few weeks (300 to 500 hours) of
operation of a new unit, the unit should
be re lubricated to make sure all operating points
have been properly lubricated.
1. 06 Recheck all clutch gaps to insure that the
parts, after seating themselves, have not
caused the clutch gaps to open up. Reset if nec-
essary. Standard readjustment periods are to be
maintained
thereafter.
1. 07 Reference made to left or right, up or
down, front or rear, etc, apply to the unit
in its normal operating position as viewed from
the front.
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