Singer 211G 155 User manual

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•r V
SERVICE MANUAL
FOR
SINGER
SEWING MACHINES
211G 155
211 G156
THE SINGER COMPANY
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CONTENTS
Page
Description 3
Speed 3
Installation of the machine 4
Lubrication 4
Needles 5
Thread 5
Bobbin removal 5
To wind the bobbin 6
Bobbin replacement 6
To set the needle 6
Threading of needle thread t . . 6
Preparation for sewing 7
Adjustment of thread lubrication 7
Tension control 7
Adjustment of stitch length 7
Regulation of presser foot pressure 8
Reengagement of safety clutch 8
To use the reverse feed on the 211 G156 machine ... 8
Adjustment of the thread controller spring 8
Adjustment of tension release 8
Adjustment of needle
bar rock frame . . . * . . . 8
Adjustment of height of needle bar . 9
Adjustment of the hook 10
Replacement of hook
Feed dog adjustment
Adjustment of the presser bar height
Adjustment of the lifting eccentric and the lift
of the alternating presser feet
Adjustment of the feed driving eccentric .
Adjustment of the reverse feeding mechor
on the 211 G156 machine
Replacement of arm shaft connection belt
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DESCRIPTION
The 211 G 155 MACHINE is a single needle, lockstitch, high speed sewing machine with
compound feed and alternating presser feet. It Is suitable for automobile
and furniture upholstery, awnings, tarpaulins, leather coots, buffing wheels,
and other difficult work.
The machine has the following specifications:
1. Needle Bar Stroke: l-Vu inches = 33,40 mm
Clearance under Presser Foot: Vz inch = 12,70 mm
Space at Right of Needle lO-Vz inches = 266,70 mm
Maximum Stitch Length: S-Vz stitches/inch = 7,25 mm/Stich
Bed Dimensions: 18-V4 X 7 inches = 476,25 X 177,80 mm
Machine Pulley (Safety Type) for Va inch = 9,50 mm V-Belt
Outside diameter of belt groove 2.9 inches = 73,65 mm
Effective diameter for Vie inch = 7,93 mm round belt is 2-V8 inches =
60,30 mm
Head End Location for Singer Light No. 625024-504
2. Adjustable thread lubrication.
3. Sleeve take-up.
4. Vertical axis hook, with rigid needle guard, makes two (2) revolutions for
each stitch.
5. Safety clutch to prevent any overload or damage of the hook.
6. Needle Feed is adjustable relative to the lower feeding mechanism.
7. Alternating presser feet, adjustable by means of a lifting eccentric.
8. Stitch length indicated on the machine pulley and controlled by means of
on adjustable feed driving eccentric.
9. Arm shaft and bed shaft are supported on the driven side by double-
shielded ball bearings. The needle bar frame rock shaft and the feed
driving rock shaft are equipped with "Super Ollite" bearings. The feed
driving eccentric connection has needle bearings.
The 211 G 156 MACHINE is the sameas the 211 G155 machine except that
the
machine is provided with a reverse feed which can be actuated by hand
lever or foot treadle;
the maximum stitch length Is 5 stitches/inch;
the needle feed is set synchronous with the lower feed mechanism;
the arm shaftand the bed shaft are supported on the driven side bydouble-
shielded ball bearings. The needle bar frame rock shaft, thefeed driving rock
shaft, and the feed driving eccentric connection are equipped with "Super
Oilite" bearings.
SPEED
The recommended maximum speed for the 211G155 MACHINE is
3500 RPM and that for the 211 G156 MACHINE is 2900 RPM. The speed
depends on the type of material being sewn and on the method of sewing.
At first the machine should be run below the maximum speed until all the
movable parts and bearings are run in.
CAUTION: The machine pulley mustalways turn over toward the operator
when the machine is in operation.
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INSTALLATION OF THE MACHINE (Figure 1)
Before the machine is placed in the table top, the oil
pan "A", Fig. 1, should be attached in the table top
cutout, so that its left end is even with the left end of
the cutout. The knee lifter bracket "B" is assembled as
•mH
Figure 1
shown in Figure 1 and the knee lifter chain is attached
to the knee lifter lever after the machine has been
placed in the table top. The thread unwinder "D" is
attached to the table top so that, if the engagement
lever "E", Fig.9, is depressed, the bobbin winder drive
wheel is driven by the machine belt.
CAUTION: The machine should not
be put in ope
ration, even for a trial, unless all the instructions for
the lubrication of the machine are observed.
LUBRICATION (Figures 2 — 6)
For the lubrication of the machine, only Singer Oil
"Type A or C", supplied by The Singer Company,
should be used. In order to insure proper function of
the machine and to prevent any excess wear of the
moving parts and bearings, the machine should be
oiled regularly. In
case of continuous use, it should be
oiled even more often if it is used to
produce long
seams and run steadily. All the arrows marked "F",
"G" and "H" as well as the unmarked arrows in Figures
2-6 are lubrication points.
Figure 2 shows the machine
head with the lubrication
points
"F" when the face plate has been removed.
These lubrication points must be oiled in addition to
all the other points before the machine is placed in
operation for the first time.
Figure 3 shoes the back of the machine with various
lubrication points.
1
Figure 2
Figure 3
Figure 4
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Figure 4 shows the underside of the 211 G155
MACHINE and Fig. 5 that of the 211 0156 MACHINE
with the lubrication points for both machines. They can
be oiled when the machine is tilted bock on its hinges.
Figure 5
Figure 6 shows the hook lubrication points "G" and
"H"
which can be reached after opening the right hand
bed slide. The oil reservoir "G" oils the upper hook
bearing and the mechanism for the mechanical opener.
The small green felt "H" on the bobbin case oils the
Figure 6
hook raceway and should always be saturated with oil.
If the felt appears almost black, then there is sufficient
oil. If it is dry, then the color is a light green. On a new
machine, the felt should be oiled each time the bobbin
is changed.
NEEDLES
Original Singer Needles, Catalog No. 3355 (135x17)
which are available in sizes 9-26 should be used for
this machine. The needle size is determined by the size
of the thread, which should run freely through the
needle eye. Rough
and non-uniform thread that does
not run freely through the eye interferes with the proper
function of the machine. Orders for needles should in
clude the desired auantity, the catalog number, the
size,
and the type. Tne type is shown with a suffix:
1 - chrome plated, 2 - nickel plated, 3 - special fine
point.
Example: 100 -3355 - 12 -1
(100 needles -Catalog No. 3355 -
Size 12 - Chrome Plated)
Needles and package carry the name: SINGER.
THREAD (Figure 7)
Left-twist thread should be used in the needle. Either
right or left twist can be used in the bobbin.
To determine the thread twist, hold the thread as
shown in Figure 7. Turn it between thumb and forefin
ger of the right hand counter-clockwise (towards you).
If left twist, the strands will wind tighter; if right twist,
the strands will unwind.
Based on past experience, the following needle sizes
are recommended for the different threads.
Cotton Thread Silk
Needle Size
100 to 150
000 to 00 10
90 to 100
00 n
80 to 90
0 12
70 to 80 A
13
60 to 70 A
14
50 to 60 B
15
40 to 50 C 16
30 to 40 C 18
24 to 30
D 20
16 to 24 E
22
BOBBIN REMOVAL (Figure 8)
Turn the machine pulley towards you until the needle
bar has reached its highest point. After opening the
right bed slide, lift up latch "J", Fig. 8, and remove
bobbin.
J
Figure 8
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TO WIND THE BOBBIN (Figure 9)
Place the bobbin onto the bobbin winder spindle
sliding it on the spindle to its stop. Pass the thread
through the thread guide "K", Fig. 9, in the tension
control bracket and between the tension discs to the
bobbin. Thread a few windings on the bobbin. Press
down lever "E" to push the bobbin winder pulley
against the drive belt and start the machine. When
enough thread has been wound on the bobbin, the
winder will stop automatically.
Figure 9
Ifthe thread does not wind evenly, loosen screw "L",
Fig. 9, and correct by moving the tension control
bracket. Tighten screw "L". The amount of thread
wound on the bobbin is adjusted with screw "M". For
more thread, the screw is turned clockwise; for less
thread, counter-clockwise. Bobbins can be wound while
the machine is sewing.
BOBBIN REPLACEMENT (Figures 10 and 11)
Hold the bobbin between thumb and forefinger of
the right hand so that the thread unwinds at the bottom
from left to right. Figure 10. Put bobbin onto the center
stud
and close latch "i", Figure 11. Pull the thread into
Figure 10
6
slot "N" and draw underneath the back of projection
"O" on the bobbin case. Draw the thread through until
it extends approximately 2 Inches = 5 cm out of the
J
Figure 11
bed slide opening. The bed slide should not be closed
completely to allow the thread to be pulled down.
TO SET THE NEEDLE
Turn the machine pulley towards you until the needle
bar has reached its highest position. Loosen set screw
at the lower end of the needle bar and push the needle
to its stop. The long groove should be on the left and
the needle eye should be in line with the arm of the
machine. Tighten the set screw thoroughly.
THREADING OF NEEDLE THREAD (Figure 12)
With the needle at the highest position, pass the
thread from the unwinder through the hole in the
Figure 12
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thread guide Fig. 12, which Is mounted on the arm
cover. From there, pass the thread through the three
(3) holes of the thread tensioner guide "Q". Starting
with the top hole,thread from rightto left, from leftto
right through the middle hole, and from right to left
through the bottom hole. Pass the thread over and bet
ween the tension discs "R", from right to left, and wind
it under and around thread controller "S" from right
to left. It is placed under the controller spring "T" and
over the controller projection so that the controller
spring holds the thread down.
Pull the thread through
the thread guide "U" and then from right to left through
the eye of the thread take-up "V". Pass it bock again
through the thread guide "U", lead it behind the oil
felt pad "W" and then draw the thread through the
thread guide "X", and from left to right through the
eye of the needle.
PREPARATION FOR SEWING
Hold the end of the needle thread loose in the left
hand. Turn the machine pulley towards you until the
needle has made one full stitch and is bock to its highest
point. By pulling the needle thread, the bobbin thread
will come through the hole in the feed dog. Lay both
threads underneath the presser feet and close the bed
slide completely. Now the machine is ready for having
the material placed under the presser feet.
ADJUSTMENT OF THREAD LUBRICATION
(Figure 13)
The oil reservoir for thread lubrication can be filled
through hole "Y", Fig. 13, in the face plate. The amount
of oil going to the oil felt
pad can be adjusted by nut
"Z"; for more oil, turn counter-clockwise; for less oil.
AA
Figure 13
turn clockwise. The oil flow can be turned on and off
with the plunger release lever "AA", The oil flows when
the lever is in the horizontal position; there is no flow
when it is in the vertical position.
For thread lubrication always use Singer Thread
Lubricant, Type "E".
TENSION CONTROL
(Figures 11, 13, 14, 15 and 16)
The tension of the needle thread Is regulated by
thumb nut "AB", Fig. 13, and should only be changed
when the presser feet are down and the tension is not
released. Turning the nut clockwise increases and turn
ing it counter-clockwise decreases the tension.
The tension of the bobbin thread is regulated on the
bobbin case tension spring by means of the adjusting
screw "AC", Fig. 11. Turning it clockwise increases and
turning it counter-clockwise decreases the tension.
Figure 14
With correctly adjusted tensions, the needle and
bobbin threads should be locked in the center of the
material as shown in Figure 14.
Figure 15
If the tension on the needle thread is too tight, or if
that on the bobbin thread is too loose, the needle
thread will lie straight along the upper surface of the
material as shown in Figure 15.
<J~~ -o-
<y~
Figure 16
If the tension on the bobbin thread is too tight, or if
that on the needle thread is too loose, the bobbin
thread will lie straight along the underside of the mate
rial as shown In Figure 16.
ADJUSTMENT OF STITCH LENGTH (Figure 13)
The stitch length can be adjusted only when the
machine is stopped. Stitch length, in number of stitches
per inch, can be read on the stitch length indicator of
the machine pulley. To changethe stitch length,depress
the button "AD", Fig. 13, and turn the machine pulley
until the button
engages (clicks) with the adjustable
feed drive eccentric. Continue turning until the desired
number of stitches per inch appears opposite the mark
on the machine arm. Then release the button.
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REGULATION OF PRESSER FOOT PRESSURE
(Figure 3)
The pressure on the material should be as light as
possible while
still sufficient to insure correct feeding.
The presser foot pressure is adjusted with screw
"AE", Fig. 3. Turning of the screw clockwise increases
and counter-clockwise decreases the pressure.
REENGAGEMENT OF SAFETY CLUTCH
(Figure 13)
Asafety clutch to prevent any overload and damage
to the hook is installed in the lower belt pulley. If it is
disengaged, open the bed slide and check the hook.
Remove all thread
and foreign matter from the hook
by carefully turning the machine pulley forward and
backward until the machine turns freely. Bypressing the
stitch length regulator button "AD", Fig. 13, and at the
same time turning the machine pulley,the hook driving
shaft is locked until the safety clutch isreengaged. Reset
the stitch length and the machine is ready for sewing.
TO USE THE REVERSE FEED ON THE 2110156
MACHINE (Figures 20 and 26)
The feed of the machine can be reversed by hand
lever or foot treadle.
To change feed direction by hand, push the reverse
lever "AF", Fig. 20, completely down in order to have
the same stitch length as in forward feed.
Release it only when you want to again feed the
material in the normal direction.
To reverse the feed with the foot treadle, the foot
treadle chain should be connected to the hole in the
reversing lever "AG", Fig. 26.
TIMING AND OTHER ADJUSTMENTS
The instructions on the following pages are for Adjusters and Mechanics only.
ADJUSTMENT OF THE THREAD CONTROLLER
SPRING (Figure 17)
The function of the thread controller spring is to
hold back the slack of the
needle thread until the point
of the needle reaches the material on its upward stroke.
AL AK
Figure 17
as without this controlling action of the spring, the slack
thread (especially silk) will sometimes be penetrated by
the point of the needle as the needle is descending. The
spring should be adjusted so that the thread
Is under a
light tension when It passes around the bottom of the
bobbin case and is cast off the hook point. The tension
of the controller spring should be sufficiently heavy to
work satisfactorily at high speed and should also be
light enough to allow the full upward movement of the
spring before thread is demanded by the take-up. The
regulation of the controller spring depends on sewing
condition and the thread used.
Adjust the spring travel by loosening screw "AH",
Fig. 17, and turning spring stop "AJ".
To adjust the spring tension, loosen set screw "AK",
Fig. 17, and turn tension stud "AL". Turning counter
clockwise increases and turning clockwise decreases
the tension.
ADJUSTMENT OF TENSION RELEASE
(Figure 24)
The tension release automatically relieves the spring
pressure exerted on the needle thread tension disc
when the presser feet
are moved to the top position by
the
hand or knee lifter. The release can be adjusted by
loosening screws "AM", Fig. 24,
and positioning tension
release spring. Then securely tighten screws "AM".
ADJUSTMENT OF NEEDLE BAR ROCK FRAME
(Figures 18, 19, 20 and 21)
On the 211 G155 MACHINE the needle bar rock
frame is driven by a compound drive mechanism which
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can be made synchronous or differentiated with the
lowerfeed. It must be adjusted so that, in zero position
of the synchronous feed, the distance between the
vibrating presser bar in the needle bar rock frame and
the vertically moving presser bar, in the arm, is 2V64 inch
= 8,33 mm {see Figure 21}.
h
Figure 18
For synchronous feed, and for alignment of the
needle bar rockframe, adjust the feed driving eccentric
for zero stitches. Loosen
lock nut "AN", Fig. 18, and
bearing nut "AO". Then move screw "AP", Fig. 18, to
its normal operating position against an inserted V64
inch = 2 mm diameter pin or needle shank in the slot
of the adjustable crank "AQ". Remove the front arm
cover, loosen screw "AR", Fig. 19, and adjust the
needle bar rock frame to the vertically moving presser
Figure 19
bar to obtain the distance between the vibrating pres
ser bar and the vertically moving presser bar as shown
in Figure 21.
For differentiated feed, adjust the feed driving eccen
tric to the desired number of stitches per inch. Loosen
lock nut "AN" and bearing nut "AO". Move screvy
"AP" in the adjustable crank to the back in order to get
alarger movement of the upper feed relative to the
lower feed, and to the front for a smaller movement.
Figure 20
On the 211 G156 MACHINE the needle bar rock
frame is driven synchronously with the lower feed. It
has to be adjusted so that, in zero position, the distance
between the vibrating presser
bar in the needle bar
rock frame and the vertically moving presser bar, in the
arm, is
^V64 Inch = 7,54 mm (see Figure 21).
For alignment of the needle bar rock frame, adjust
the feed driving eccentric for zero stitches, so that it
cannot feed. Remove the front arm cover, loosen screw
"AS", Fig. 20, and adjust the needle bar rock frame to
the vertically moving presser bar to obtain the distance
between the vibrating presser bar and the vertically
moving presser bar as shown In Figure 21.
ADJUSTMENT OF HEIGHT OF NEEDLE BAR
(Figure 21)
The adjustment of the needle bar height can be
checked with two timing marks which are located
approximately 2 inches = 50,8 mm from the lower end
of the bar. The upper mark should be just visible at the
lower
edge of the needle bar rock frame when the
needle bar is in its lowest position. The lower mark
should be just visible when the hook point has reached
the center line of the needle with the feeding mecha
nism in zero position (synchronous on the
211 G155
MACHINE).
The needle bar can be adjusted up or down by loos
ening the pinch screw "AT", Fig. 21, accessible through
a hole in the face plate. This hole eliminates the neces
sity of removing the face plate to make the adjustment.
Securely tighten screw.
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BA
BE
Figure 21
To set a needle bar which has no timing marks, the
feeding mechanism must be set on zero stitches (syn
chronous on the 211 G 155 MACHINE). Insert a straight
needle in the needle bar. Then set the needle bar so
that, when it rises V32 inch = 2,4 mm from its lowest
position, the point of the hook is at center line of the
needle and the eye of the needle about Vie inch =
1,6 mm below the point of the hook.
ADJUSTMENT OF THE HOOK
(Figures 22 and 23)
To adjust the hook relative to the needle (distance
and timing) remove the throat plate and set the feed
ing mechanism on zero stitches (synchronous on the
211 G 155 MACHINE). Check the needle bar height for
proper adiustment and use a straight needle which has
been correctly inserted to its stop. Turn the machine
pulley over towards you until the lower mark on the
needle bar is just visible at the end of the needle bar
rock frame on the upward stroke of the needle bar. In
this position the hook point should be about V16 inch =
1,6 mm
above the needle eye on the center line of the
needle and as close as possible to it without touching.
The needle should barely touch the hook needle
guard
"AW", Fig. 23, without being deflected by it.
To adjust the distance between hook point and
needle, maintain the hook point at the center of the
needle, loosen screws "AU", Fig. 22, underneath the
bed of the machine, and move the hook saddle to the
right or left as required. Then securely tighten screws
"AU".
10
Figure 22
To time the hook point relative to the center line of
the needle, loosen the set screws on the hub of the hook
driving gear "AV", Fig. 22. Then tap the gear to the
AW
Figure 23
right, if the hook time is to be advanced, and to the
left if it is to be retarded.
The hook needle guard"AW", Fig. 23,which Is mount
ed on the outer periphery of the nook, should be ad
justed sothattheneedle can never touch the hook point
In the event that it is deflected in that direction.
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REPLACEMENT OF HOOK (Figure 22)
To replace the hook, remove the presser feet, throat
plate, bed slide, feed dog, and the bobbin case opener.
Loosen the set screws in the hub of the hook drive gear
"AX", Fig. 22, pull the hook upwards from the hook
saddle, and insert a new one. Then replace the feed
dog and the bobbin case opener. The new hook should
be adjusted as explained above.
FEED DOG ADJUSTMENT (Figure 22)
The feed dog is attached by two screws to the feed
bar. The feed dog should be adjusted sideways in the
throat plate so that it does not touch it. It should also
be centered in the direction of feeding so that the
needle, in its lowest position,
will be slightly in front of
the center of the needle hole fseen from the front). For
average sewing conditions, a tuII tooth of the feed dog
should show above the throat plate with the feed dog
In its highest position.
The feed dog can be adjusted with respect to the
throat plate and needle by loosening the two pinch
screws "AY", Fig. 22. Securely tighten pinch screws
"AY".
To adjust the feed dog height, turn the machine
pulley towards you until the feed dog is at its highest
position. Loosen screw "AZ", Fig. 22,
and pinch screws
"AY", Fig. 22. Then move the feed bar to raise or lower
the feed dog as required. Securely tighten screws "AZ"
and "AY".
When raising or lowering the feed dog, care must
be taken that its underside does not drop low enough
to strike the hook.
ADJUSTMENT OF THE PRESSER BAR HEIGHT
(Figure 21)
Inorder to prevent damage to the alternating mecha
nism, the clearance under the presser feet is limited to
V: inch = 12,70 mm by the guide block "BA", Fig. 21,
in the presser
bar guide. The presser bar releasing lever
bracket "BE", that is part of the alternating mechanism,
must be adjusted so that there is a V64 inch = 0,4 mm
clearance between the hand presser bar lifter and the
releasing lever bracket "BB" when both presser feet are
resting on the throat plate. This adjustment can be
accomplished by loosening the pinch screws
and mov
ing the guide block "BA" or the releasing lever bracket
"BB". Securely tighten the pinch screws.
ADJUSTMENT OF THE LIFTING ECCENTRIC
AND THE LIFT OF THE ALTERNATING
PRESSER FEET (Figure 24)
The lift of the alternating presser feet is governed by
the thickness of the material sewn,
and should be no
higher than necessary. Normally, the lift isthe same for
both presser feet and is infinitely variable within the
machine's capability by means of the lifting adjustable
eccentric.
Figure 24
To adjust the lift of the presser feet use a screw
driver to hold the lifting eccentric adjusting disc "BC",
Fig. 24, from turning. To increase the lift, turn the ma
chine pulley towards the operator; to decrease, turn
the machine pulley away from the operator. For special
requirements, the lift height can be increased by mov
ing the screw stud "BD" to the threaded hole "BE",
Fig. 24.
To time the lift of the alternating presser feet, loosen
the set screws "BP", Fig. 24, in the lifting eccentric and
adjust the eccentric on the arm shaft. For normal work,
the lifting eccentric is regulated with the presser feet at
the same height, so that the point of the needle enters
the throat plate when the feed dog touches the movable
presser foot while both are even with the upper edge
of the throat plate. Securely tighten the set screws "BP".
ADJUSTMENT OF THE FEED DRIVING
ECCENTRIC (Figures 25 and 26)
The stitch length of the machine can be adjusted by
means of the feed driving eccentric as explained under
"ADJUSTMENT OF STITCH LENGTH". The feed driv
ing eccentric Is mounted on the bed shaft as illustrated
in Figure 25 for the
211 G 155 MACHINE and in Figure
26 for the 211 G 156 MACHINE.
The feed driving eccentric "BG" is held in a guide
of the feed driving flange "BH"
and adjusted by means
of the adjusting screws "BJ" which are secured by lock
screws to prevent shifting. To adjust, loosen the two
lock screws and turn in the two adjusting screws "BJ"
until all play is eliminated and the eccentric fits quite
snugly in the
guide of the feed driving flange "BH".
11
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BG BH BJ
Figure 25
The linear movement of the eccentric is accomplished
by turning the adjusting disc "BK". A spring located
between the adjusting disc and a collar prevents the
disc from moving out of position when the machine is
in operation.
The timing of the eccentric in relation to the needle
movement is achieved by the feed driving eccentric
positioning screw In a splined groove of the bed. The
positioning screw is the
first screw to appear when
turning the machine pulley In normal direction of
rotation.
ADJUSTMENT OF THE REVERSE FEEDING
MECHANISM ON THE 211G156 MACHINE
(Figure 26)
As explained under "TO USE THE REVERSE FEED
ON THE 211 G 156 MACHINE", the direction of feed
BJ BG BH BK
Figure 26
12
AG
can be reversed by using the reverse feeding mecha
nism which is adjusted at the factory for equal stitch
length for forward and reverse sewing. Its bearing
block is pinned in position and should never be
changed.
To adjust this mechanism, set the feed driving eccen
tric "BG", Fig. 26,to 5 stitches/inch,loosen screws "BL",
Fig. 26, and move crank "BM", Fig. 26 until 5 needle
penetrations make exactly one inch. Then fully depress
the reversing lever and the eccentric head of the
bearing pin "BN", Fig. 26, should be resting against
the bearing block. Loosen the two set screws "BO",
Fig. 26, and turn the bearing pin "BN" until the stitch
length is the same in advance and reverse. Securely
tighten all screws.
REPLACEMENT OF ARM SHAFT CONNECTION
BELT (Figure 27)
Remove the needle to ovoid damage to the hook.
Slide belt off the lower pulley, loosen the two screws
in the machine pulley, and remove the machine pulley
with the ball bearing from the arm shaft. Lift the belt
up and draw it around the arm shaft through the space
normally occupied by the ball bearing.
BQ
O
BP
Figure 27
The new belt is inserted through the boll bearing
hole. After placing belt over upper pulley, replace
machine pulley. To remove all end play from the shaft,
lightly tighten set screws in machine pulley and (hold
ing needle bar crank in place) tap the machine pulley
into position with the palm of the hand. Tighten the
machine pulley set screws firmly.
Turn the machine pulley over toward you until the
thread take-up lever is at its highest point. Then turn
the hook driving shaft until the setting mark "B" on the
safety clutch pulley "BP", Fig. 27, is in line with mark
"BQ", Fig. 27, cut into the machine bed. Now, without
disturbing the timing of either the arm shaft or the hook
driving shaft, slip belt over lower pulley.
After the needle has been reinserted, the relation
ship of needle to hook should be checked. The hook
point should be on the center line of the needle and
Vi6 inch above the needle eye.
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