Tapes - IBM Selectric Maintenance Manual

TAPES
16.0 Broken Tapes
When a tape breaks, the cause shou Id be iso lated to
-prevent a reoccurrence-;--rh-e-foi-lowinglist-out-l-i nes-
the causes of tape breakage.
16.1 ROTATE TAPE
a. Rotate detent clearance, (Is the Detent Actuat-
ing Lever Roller in place?)
b. Print shaft timing.
c. Shift Interlock adjustments.
d. Shift Arm moving out in straight line.
e. Defective Rotate Arm or Shift Arm Pu lIey.
f. Any bind that affects free rotation of the head.
g. Loose or missing Tape Guide.
h. Burrs on any area where the tape trave Is.
i. Negative latch clearance is insufficient.
j. Latch links adjusted too long.
k. Latches slip from under the bail during operation
(links too short).
I. Foreign material obstructing the travel of the
tape.
m. Interference between the Ti It and Rotate Pu Ileys.
n . See 10.23.
16.2 TILT TAPE
a. Detent to Ti It Ri ng clearance.
b. Burrs on the Ti It Pu Iley (especia Ily where the
tape comes out of the pu Iley .)
c. Any bind that affects free motion of the Ti It
Ring.
d. Foreign materia I in the sector gears.
e. Print shaft timing (affects the rotate mechanism
more) .
f.
Tilt Pulley Spring missing or broken. (Spring
eye must face the rear of the machine.)
g. Interference between Ti It and Rotate Pu Ileys .
h. Excessive wear in the R. H. Ti It Pu Iley Stud.
Most common causes.
16.3 S.H.
Tl~.PE
BREAKAGE OR t-AAL-SELECT!ON
A curled end or a ragged leading edge on a rotate or
tilt tape will indicate one of the following:
1. Shift arm not para lie I to the carri er.
2. Rotate or ti It arm not para lie I to thecarri er •
Shou Id it be necessary to move the rotate and ti It
arm (using their mounting bracket) further to the rear
of the machine, it may be necessary to file a small
amount of material from the power frame edge in the
area of the tilt tape, in order to ensure no interfer-
ence. Shou Id it be necessary to move the arms to-
ward the front, check for interference with the follow-
ing:
1. The rotate eccentric stud on the paper bai I
spring.
2. The rotate arm itself on the damper spring stop.
4-24
3. The ti It tape rubbi ng across the head of the car-
rier shoe eccentric stud when the carrier is at the
extreme left hand.
16.4 SPRING LOADED TILT ARM
All current production Selectric I/O Printers will
have a spring loaded, left-hand ti It arm. This feat-
ure prevents accidental disengagement of the ti It tape
from its pulleys whenever slack is introduced into the
system. For example, if the operator should manu-
ally ti It the typehead duri ng remova I or i nsta Ilati on
of the head, the spring loaded arm wi II automati ca Ily
maintain the tape's position on its pu Ileys.
A simi lar spring is used on the shift arm to protect the
Rotate Spring.
16.5 S.H. ROTATE TAPE
The Rotate Tape should twist "top to the front" as it
leaves the left side of the Carrier.
16.6 S.H. TAPE INSTALLATION
When installing the new style (crimped) tapes, it may
be difficult to insert the "T" end through the rear of
the Rocker. To facilitate installation, the tape
~hould be inserted eyelet first through the front of the
Carrier, and pulled through until the "T" can easily
be inserted.
16.7 S.H. TAPE WIPER
The Tape Wiper on the left side of the Carrier must
be removed. It causes flexing of the tapes which can
resu It in ma I-selection and eventua Ily tape breakage.
16.8 S.H. OLD LEVEL TILT
When installing a Rotate Tape it is necessary to re-
move the Ti It Pulley Spring. The Ti It Tape slackens
and usually falls off the pulley. This can be prevented
by p laci ng a rubber band around the Ti It Tape near
its anchor pin on the right side of the Carrier, and
then hooking the rubbei band to the right hand MOi-
gin Stop. This will hold tension on the Tilt Tape to
keep it on the pulley, and will also hold the tape on
the anchor pin c lear of the path for the new Rotate
Tape.
16.9 GEARLESS TILT PULLEY/BELLCRANK
An improved ti It pu Iley and be Ilcrank has entered
production. This pulley/bellcrank will provide a
more reliable tilt operation and will eliminate acci-
dental disengaging of the tape at the pulley anchor
and will also eliminate breakage of the tilt tape due
to flexing at the tape anchor point.
This new design tilt pulley/bellcrank, B/M 1280498,
is avai lab Ie for fie Id rep lacement. In order to pre-
clude a third level of tapes, all former gearless tilt
tapes and ti It pu Ileys have been made obso lete. When
replacement parts are necessary, a complete conver-