IBM B-1 Guide

I
E T CUSTOMER ENGINEERING
B-1 ADJUSTMENT MANUAL

®
ETD CUSTOMER ENGINEERING
8-1 ADJUSTMENT MANUAL
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TABLE OF CONTENTS
BACKSPACE · 19
CARRIAGE.
9
CARRIAGE RETURN •
32
ESCAPEMENT 4
KEYLEVERS AND CAMS 7
MARGIN RELEASE •
13
MARGIN SET •
12
MOTOR AND DRIVE 1
OPERATIONAL CAMS •
1'8
PAPER FEED.
· 14
RAILS
· 11
RIBBON •
40
RIBBON LIFT o 43
SHIFT
• 23
SPACEBAR.
• 39
TABULATION.
.26

MOTOR AND DRIVE
1. The ON-OFF SWITCH should function without
hesitation and have even positive overthrow in both po-
sitions. (Fig. 1)
The switch requires equal overthrow in both
directions in order to insure positive operation.
Adjust the r ear clevis on the switch op era ting
link for this condition. Th e switch operating
link mus t be held by its clamp and be free of
all binds.
" 0
3. The SELF ALIGNING BEARINGS of the motor
and power roll should be aligned to their shafts to elimi-
nate binds.
If a bind should occur I a slight tapping action
on the pulleys with the handle of a screwdriver
should produce satisfactory resul ts.
1
MODEL B1 ADJUSTMENTS
2. POWER ROLL END PLAY should be .002" to .010"
(Fig. 2). Make the adjustment by positioning the power
roll pulley on the shaft, then tightening the set screws.
Th e power roll mus t be held to the left w hile
making this adjus t men t (Fi g" 3)" Excessiv e
clearance will allow the pow e r roll to drift
l ef t to right. As the power ro ll moves to th e
right, its shaft will contact th e clutch plate
and make noise"
Insufficient clearanc e w ill cause bearing to
heat and expa nd I ca us ing machine to lo ck up"

MODEL B1 ADJUSTMENTS
5. POWER ROLL SPEED is adjusted by a two-step
motor pu Iley o The motor pulley shou Id be positioned on
the motor shaft to
align the belts ~nd the pulleys (Fig. 5).
A 14-tooth pulley is generally used for the
Elite or 12 pitch type styles, w hile the 15-
tooth pulle y is us ed for the larg er Pica type
st y les or bold fac e type st y les. '
2
MOTOR AND DRIVE
40 Adjust the DRIVEN BELT by positioning the inter -
mediate
pulley shaft. The shaft incorporates a left-hand
thread so that pulley rotation tends to ti ghten the shaft.
The deflection of the belt should be approximately 3/ 8"
(Fig. 4).
60 Adjust the DRIVE BELT for approximately 3/ 16"
deflection by positioning the motor adiusting screw for-
ward or back
in its elongated mounting hole (Fig. 4).
To adjust the drive belt tension on ring mount-
ed motors, loosen the motor adjusting screw
and the ring mount bracket screw (Fig ~ 6). The
motor may then be moved front to rear for pro-
per belt tension. After tightening these screws,
check the motor housing to be sure it is paral-
lel to the frame and that the ring mount screws
are tight. To adjust the drive belt tension on
the shaft mounted motor I it is necessary only
to loosen the motor adjusting screws.

MOTOR AND DRIVE
The following are the effects of loose or tight
belts:
LOOSE BELTS
1. Belt noise
2. Belt climbing on pulley
3. Uneven impression (due to momentary
slowing of the power roll after shift or
backspace operation).
4. Be lt falling off when machine is moved
TIGHT BELTS
1. Belt noise
2. Motor vibration transmitted to machine
3. Failure of motor to start (extremely tight
belts) .
Properly adjusted belts should run quietly, bounce
only slightly during a shift operation, and allow
the drive - mechanism to coast to a smooth stop as
the switch is turned off.
MODEL Bl ADJUSTMENTS
3

MODEL B1 ADJUSTMENTS
Carr. Length
Extreme Left Extreme Right
12"
2 1/2
3 3/8 Ib
16"
2 1/2
3 1/2 Ib
20' .' 2
3/4 3 5/8 Ib
24"
2 3/4 3 7/8 Ib
20" . 3 4
1/8 Ib
CAUTION: Use extreme care when removing
tens ion tape loop from s pring drum. Serious
injury can result from fingers caught by spin-
ning s pring drum.
4
ESCAPEMENT
1. . The MAIN SPRING tension is adjusted by placing k
the loop of the- carriage tension tape on various lugs of
the spring drum (Fig. 7).
Carriage tension should be checked from the
full left to the full right position of the car-
riage (excluding air cylinder range). Tension
is measured with the push pull scale and
should measure as follows (Fig. 8).
2. Adjust UNIVERSAL BAR so that all typebars trip
the escapement pawl at the same di stElnce from the PLATE N
(Fi
g. 9) ~

ESCAPEMENT
The rear , spring of the universal bar is , mount-
ed to the suppor t by a Hex screw (Fig. '10)
through an enlarged hole in the spring. The
off center mounting of the trip link on the uni-
versal bar would cause un even tripping if the
universal bar were adjusted square with the
segment. To provide even tripping I the uni-
versal bar is adjusted s lightly forward on the
, right. To adj ust the universal bar for this con-
dition; loosen hex scr ew I place # I, #22, and
#42 typ eba rs in front of th e type guide as
sho w n. The tension of the universal bar springs
cause th e universal bar to move against the
staggered typ e bars (Fig. 10).
3. UNIVERSAL BAR ADJUSTING PLATE is positioned
so that the escapement pawl wi II be tripped at the same
point
in both u'pper and lower case.
Reposition the adjusting plate by loos e ning
the locking screw and sliding the plate up or
down (Fig. 12). The locking screw is more
accessable if the basket is in low er case and
the universal bar held to the rear. Be sure to
tighten locking screw after adjusting. Check
by using the same type bar for both upp er and
lower case positions. Maladjustment w ill
result in type piling or chcking off of typebar.
Escapement Trip Lever MODEL
Bl ADJUSTMENTS
5
, Escapement Pawl
Bar
No.1 Typebar
No. 22 Typebar
The hex screw is then tightened; holding the
universal bar in this new position. The hex
screw can be reached from the bottom of the
machine with an ' open end wrench or from the
rear with a spinner wrench through the rear
frame (Fig. 11). Tripping should now be
checked by moving typebars slowly toward
the platen to insure even tripping. If tripping
remains uneven, the proces s must be repeated
with th e 3 typebars staggered either more or
l ess .
If the end typebars trip correctly with the
center typebars e ith er ea rly or late I form the
support up or down until all trip the same.
Uneven tripping will cause type piling.

MODEL Bl ADJUSTMENTS
6
ESCAPEMENT
4. Adjust TRIP LINK to trip escapement pawl wherl'
any typeface is 3/ 8" + 1/ 8" from the platen (Fig. 13).
Early tripping wi ll cause t ype piling due to
late restoring of escapement pawl spacer.

KEYLEVERS AND CAMS
1. Cam clearance is adjusted for .015" to .020"
clearance between the nylon letter cams and power roll.
Adjust by loosening the upper screws on the
cam lever bearing support and pivoting the
support on its pivot screws (Fig. 14).
2. Adjust the KEYLEVE,R BE - ARINGSUPPORT up or
. down so that the keylevers will , trip their respective cams
when the keylevers are 1/32
11
+ 1/64" from the bottom of
the keylever guide comb.
Adjust by loosening either both front or both
rear bearing support mounting screws slightly.
*Tap the loose screw or the support, up or
down with a screwdriver and hammer. This
method allows the slight change which is ne-
ces sary. * (Do not loosen both screws on either
end, as this will allow the support to lose all
adjustment). Check for proper tripping with
several keylevers at both en d s ""- of ;""; the ke yboard.
If, with correct tripping, some trip levers do
not restore, check adjustment #1 above.
7
MODEL B1 ADJUSTMENTS
Check the adjustment by using tab cards (.007"
thick as a guage. Three cards (. 021") tight,
two cards (.014) loose (Fig. IS). Cam clear-
ance must be equal across all cams in order
to have uniform impression and keyboard touch.
Excessive clearance will cause failure of cams
to engage power roll as keylever bottoms, or
failure of trip lever to restore as key lever re-
stores. Insufficient clearance will cause weak
impression and repeating cams.
CAUTION: Any change in cam bearing sup-
port will affect functional cam c leara1 1 ces. Be
sure to re-tighten locking screw after adjust-:-
ment is correct.

MODE L Bl ADJU ST MENTS
Individua l keylevers are lowered by closing
t he ga p between the ad j us tin g l ugs. Th is
closing can be done with the duck-bill p liers
(Fi g. 17). Spreading the 1 ugs wi th a screw -
driver w ill raise th e key l ever (Fig . 18). Care
mu st be t aken when ra i sing or lowering i ndi-
vidual key l evers so as not to break or b in d up
the key l eve r .
8
KEYLEVERS AND CAMS
3. Ind ividual keylevers, which will not trip and re-
store with the majority, are adiusted
individually by the
adjusting lugs on
each keylever.
8. The KEYPLATE is positioned so that the keybuttons
are free
of binds and that 2/ 3 to 3/4 of each keybutton .
extends above it.
(Fig. 19.)
The keyplate is adjusted by repositioning its
mounting brackets on the side frames ~ With
the front cover off I the keyplate has a slight
bow in the center. This bow is flattened as
the top cover is screwed down and stops any
vibration between the keyplate and cover. It
should be noted that the keyplate positions
the top cover when the cover is in place.

CARRIAGE
1. Adjust the PLATEN lATCH ECCENTRICS to just
eliminate verticle movement of the platen. (Fig. 20.)
Loosen locking nut on th e ecce ntric b ef o re
attempting to adjust · it. Excessiv e clearance
w ill allo w th e platen to move I giving unev en
writing line. Latches will work hard if adjusted
too tight.
3. Position the PLATEN RETAINING PLATES to hold
the platen guide shaft eccentrics tightly against the platen
adjusting plates. (Fig. 22.)
The multiple copy control lever must be for-
ward.
9
MODEL B1 ADJUSTMENTS
2. Adjust PLATEN CONTROL YOKES to remove
front to back movement
of Platen. (Fig. 21.)
Some machines w ill ha ve l ock in g sc r ews
and eccentrics; oth e rs only lo c kin g s cre w s.
With both types I lo ose n th e lo ck in g scr ews
and adjust. Correct adjustm e nt in s ures a
snug but ea s ily re mov abl e plat e n.

MODEL Bl ADJUSTMENTS
There should be a slight drag on the strip of
paper as it is removed when the platen is in
the proper position (Fig. 24).
Check this adjustment at both ends of the
plat en to insure ring and cylinder will not
change across the platen.
Be fore adjusting the platen adjusting eccentrics I
loosen the fee d roll c enter support screws I
(Fig. 25) and both rear platen retaining plate
scre w s.
10
CARRIAGE
4. Adjust RING AND CYLINDER by moving inner
carriage
and platen front to rear with the ,platen adiu!;t-
ing eccentrics (Fig. 23).
Check RING AND CYLINDER with a single
sheet of bond paper in the machine I and the
ribbon in operating position. Hold a typebar
in lower case position against the ring with
a strip of bond paper used as a guage between
the ribbon and the sheet of bond paper.
5. Adjust FEED ROLL CENTER SUPPORT to just touch
the eccentric collar on the platen guide shaft. (Fig. 25.)
The center supports must be readjusted after
any change in carriage ring and cylinder ad-
justment. On long carriage machines I it will
be necessary to loosen the margin rack center
support before adjusting the feed roll center
support.
Correct support adjustment insures the proper
relation between platen and feed rolls as the
multiple copy control is adjusted.

RAILS
10 The FRONT RAI L is positioned in the full for-
ward position and locked in position with the rai I clamp-
ing screw. (Fig. 26.)
The front rail is mounted to the power frame
and maintains the correct relationship between
the carriage and the type basket. The front
rail is not adjustable and should remain in
position during all rail adjustments.
3. Adjust the REAR RAIL ADJUSTING SCREWS to
just eliminate front to rear motion of the carriage. (Fig. 28.)
The carriage must be full right when adjusting
the right adjusting screw I and full left when
adjusting the left adjusting screw.
The rear rail is to be adjusted·.to just remove
all front to back motion of the carriage with
the carriage in any position. With the rails
too tight, the carriage rollers will develop
flat spots, the rails will wear more rapidly,
and the carriage will bind or be sluggish. If
the rails are loose, the carriage will move
front to back causing uneven impression and
writing line. When adjusting the rear rail,
remove both carriage return and tension tape.
With the tapes removed, the carriage should
glide smoothly with no binds or front to rear
motion.
11
MODEL Bl ADJUSTMENTS
2. Adjust the RAI L SUPPORT ECCENTRICS to just
remove front to rear movement of the carriage. The car-
riage is centered on the rails for the adjustment. (Fig. 27.)
Before adjusting the rail support eccentrics,
loosen both rear rail clamping screws and
back off the rear rail adjusting screws (Fig.
28). If this is not done, adjusting the sup-
port eccentrics will bow the rails.

MODEL Bl ADJUSTMENTS
The margin stop is spring loaded to the left
by the margin control lever. Therefore, it is
necessary to adjust the margin set lever to
contact the right side of the notch as it is op-
erated. This s light off center adjustment
compensates for the tension of the margin stop
and the margin will set accurately. Do not
form the margin set lever when making this
adjustment. Move the bracket after loosening
the mounting screws (Ficj. 30). The margin
set lever mounting s' crew and lock nut must be
adjusted to remove all side movement of the
set lever without binding the set lever. The
hairpin spring must reliably restore the set
lever (Fig. 29).
12
MARGIN SET
1. Adjust the MARGIN SET BRACKET so that the set
lever enters the notch in the margin stop with the carriage
resting at the left margin (Fig. 29).
2. Adjust the MARGIN SET LINK so thatthe margin
set lever just clears the margin rack with the margin set
keybutton fully depressed •
. If the margin set lever is set too high I it will
not reliably release the margin stop from the
m~rgin rack. If the margin set lever is set
too low, it will not cam over ' the margin stop
as the set lever is incorrectly operated be-
tween the margins.

MARGIN RELEASE
1. Adjust MARGIN RELEASE ECCENTRIC so that
the margin control lever will clear the margin rack by
.010" to 0015". (Fig. 32.)
2. Adjust the LINE LOCK PUSH ROD in the follow-
. ing manner:
a. Unhook the push rod.
b. Position the carriage at the right margin.
c. Push the switch lever far enough to the
rear
to allow the linelock bracket to un-
lock the key lever.
do Push down and hold a letter keylever.
e. Push forward on the push rod until it stops.
f. Match the pin in the push rod clevis with
the hole in the lower line lock
bellcrank.
This adjustment insures maximum locking
action without choking off.
13
MODEL 81 ADJUSTME . NTS
LINE LOCK
1. The VERTICAL LINK from the upper line lock bell-
crank is adjusted so that the angle between the link and
the arm
of the lower bellcrank is approximately 90°.
(Fi g. 33.)
This adjustment insures maximum motion
transmitted to line lock push rod.

MODEL Bl ADJUSTMENTS
Too much clearance at the front feed rolls will
decrease their tension and add greater tension
to the rear feed rolls.
Check adjusting plate adjustment with the de-
flector out.
14
PAPER FEED
1. Position the ADJUSTING PLATES on the rear
pressu re leve rs (F ig . 35) so that when two I BM cards
are inserted between the r ear feed rolls and the platen,
the front feed ro lls have a sl ight amount of drag on the
platen. If five IBM cards are inserted, the front feed
rolls should be free to turn (Fig. 34).
2. Support LUGS. Form the lugs on the rear pressure
levels (Fig. 35) so that there is a clearance of .oor to .
•030" (one to four I BM cards) between the paper deflector
and the platen.
Card strips can be inserted at the ends of the
deflector and between feed rolls to accurately
check the clearance between the paper de-
flector and platen (Fig. 3 6). The deflector
must not bind the platen or feed rolls.

~.
PAPER FEED
3. FEED ROLL PRESSURE. Adjust by turning the feed
r oll pressure adjusting screws until a pressure of 12 to 16
ounces is necessary to deflect each feed roll pressure le-
ve r( Fig.37).
A push sca le may be app li ed at th e ends of
each feed r oll shaft to make a r eadi ng of this
ad ju stmen t. NO TE: De p ress th e front feed
roll pres sure l evers whe n checking the pres-
s u re of th e re ar feed roll pre s sure l ever s I b e-
cause w ith the plat e n out I th e front pr ess ur e
levers c o ntact the ad justing plat e s. Pre ssur e
bet wee n tw o f eed r olls on the s ame shaft I
e ith er fr ont or r ea r I may be eq ualiz ed by form-
ing th e f eed roll tension s pring. Th e sc r ew
pl ate sho ul d be ce nt ered be for e mak in g thi s
adjustme nt.
5. INDICATOR POINTER. Center the pointer with
re?pect to the type ' bar guide throat. (Fig. 39.)
Do thi s by loos e ning th e lin e gage card hold-
er screws w hich s e cur e th e indicator pointer
to th e front rail dust cov er .
15
MODEL B1 ADJUSTMENTS
4. The LINE GAGE CARD HOLDERS should be ad-
justed in two ways:
a. Up or down so when viewed from the oper-
ators position, a thick line of white shall be visi-
ble between the feet of the characters and the
card holders. (Fig. 38.)
b. Left or right by loosening the screws in
the front rail dust cover and positioning the dust
cover to align the marks on the card holder with
the bottom of the ViS typed on the paper (Fig. 38).
Individual card holders can be moved left to right
by loosening their mounting screws.

MODEL Bl ADJUSTMENTS
7. REAR PAPER TABLE. Adjust this so that the re-
lationship between the deflector and the paper table wi II
allow the paper to pass freely in either direction without
catching (Fig. 41).
This is adjusted by the locking scr e ws that
clamp the adjusting plates to the paper table
bracket (Fig. 42).
Check to be sure that the rear paper table is
not touching the deflector.
16
PAPER FEED
6. FRONT PAPER SCALE. Adjust in the following
manner:
a. Loosen the collar on the platen guide
shaft which positions the front paper scale
(Fig. 40 ) .
b. Position the left margin stop to its ext r eme
left position.
c. Move the carriage to the left margin.
d. Position the front paper scale to align the
zero with the indicator pointer and tight-
en the collar screw ( Fig. 39 ) .
Front scal e s must re st eve nl y across th e
platen. It must also be fre e to move front to
rear as paper is ins e rted.

PAPER FEED
8. FRONT PAPER TABLE. Adjust this so that the
graduations on the front paper table are in line with those
on the front paper scale. (Fig. 43.)
17
MODEL Bl ADJUSTMENTS
Adjust by loos e ning the positioning collars
on th e carriage tie rod and moving the rear
paper table (Fig. 44). A lso ad jus t the paper
table to r es t even ly on the platen throughout
its entire le ngth. This is acc omplish ed by
forming th e stop lugs w hich contact the car-
riage tie r od.