Singer 211W151 User manual

Form 3173W
(962)
SERVICE MANUAL
SINGER'
21tW151 machine
SINGLE NEEDLE
LOCK STITCH
This book contains complete information covering operation
and adjustment of machine and a list of parts, accessories and
special fittings. Illustrations and descriptions of parts in rear
of book should be consulted when ordering any part of machine
requiring renewal.
THE SINGER MANUFACTURING COMPANY
"A Trodemorit of THESINGER MANUFACTURING COMPANY
CopyrightC) 1^62 by ThoSmger Monufodurlng Compony
Copyright Undir Intcrnationol Copyright Union
All Righlft RtMrv«d wndtr Inter-AmtrUon Copyright Union
Printed In U. S. A.
From the library of: Superior Sewing Machine & Supply LLC

DESCRIPTION
Machine 211W151 produces high speed,
precision stitching on coats, suits, over
alls, rainwear, sports outerwear, work
clothes and similar items of medium to
heavy weight fabrics.
Single needle, lock stitch. Federal
Stitch Type 301.
Belt driven rotary sewing hook on ver
tical axis makes two revolutions for each
stitch.
Safety clutch, adjustable to suit sewing
conditions, protects hook from damage
resulting from accidental strain. Should
any foreign matter clog the hook, this
new type safety clutch will disengage it
self and will re-engage only after area
has been cleared.
Compound feed, combination of drop
feed and needle feed.
Maximum length of stitch, 5 to inch.
Presser bar lift, 1/4 inch.
Hinged presser foot.
Needle bar stroke, 1-5/16 inches.
Needle thread lubricated by felt pad
automatically supplied with oil from res
ervoir in face plate.
Bed, 20-3/8 inches long, 7 inches wide
Space at right of needle, 10-1/2 inches.
SPEED
Maximum speed, 4000 R. P. M. , depend
ing on material being stitched. It is ad
visable to run a new machine slower than
maximum speed for first few minutes to
allow time for oil to reach moving parts.
Machine pulley turns over toward operator.
SETTING UP
Fasten drip pan to table with its left end
even.with left end of cut-out. Fasten knee
lifter bracket in location shown in Fig. 2.
Assemble it so that lifter rod A does not
strike drip pan. Screw slots in bracket
provide necessary adjustment. Set stop
stud B to stop action of knee lifter as soon
as presser foot is raised enough to trip
hand lever. Screw drain pipe C into drain
hole in drip pan and attach oil jar D,
as shown.
FRONT EDGE OF TABLE'
L EDGE OF
^MACHINE
JCUT-OUT
Fig. 2. Knee Lifter, Drip Pan and Oil Jar in Position
HOOK LUBRICATION
Hook saddle contains oil pumped to
bobbin case raceway in hook during op
eration. To control amount of oil flow,
tip machine back and loosen control valve
set screw A, Fig. 3.
Fig. 3. Sawing Hook Oil
Control Valve Set Screw
Fig, 4. Sewing Hook
Oil Control Valve Screw
Return machine to upright position.
Turn control valve K to right for more oil;
to left for less oil. After desired adjust
ment is attained, re-tighten control valve
set screw A. See complete lubricating
instructions next.
From the library of: Superior Sewing Machine & Supply LLC

I
Catalog 1901 (135x7)
achine is set with 1 /4" clear-
der presser foot
or
Catalog 3355 (135x17)
achine is set wilh 3/8" clear-
der presser foot
Clea]
1 out al
1 1
int and ot!
arouj id sewi ng hook and
on und er
side of th
LONG
GROOVE
TO
LF"
N EE
AS
G HI
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THREADING NEEDLE
Fig. 10. Threading Tension Assembly
BEHIND
OIL PAD
Fig. 9. Upper Threading Complete
BOBBIN REMOVAL
RAISE LATCH
LIFT OUT BOBBIN
Fig. 12.
MOVE
TO
HIGHEST
POINT
Fig. 11. Threading Needle
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WINDING THE BOBBIN
OIL
3. PRESS DOWN
TO PUSH PULLE
AGAINST BELT,
THEN START
MACHINE
TENSION CONTROL
1. PLACE BOBBIN ON
SPINDLE AS FAR
AS IT WILL GO
\\
LOOSEN TO
ADJUST FOR
EVEN WINDING
2. WIND THREAD
AROUND BOBBIN
NOTE-TIGHTEN FOR MORE THREAD ON BOBBIN:
Regulate to stop winder when bobbin is wound
1/16 inch short of bobbin rim
Fig. 13.
BOBBIN REPLACEMENT
1. PLACE BOBBIN ON CENTER STUD
DIRECTION OF THREAD
AROUND BOBBIN
2. CLOSE LATCH
Fig. 14.
THREADING BOBBIN CASE
Fig. 15.
PULL THREAD
INTO SLOT
DRAW THREAD TO
BACK OF PROJECTION
DRAW THREAD UP
TWO INCHES
Fig. 16
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THREAD TENSIONS
Turn machine pulley until tension
screw is accessible.
Regulate needle thread tension only
when presser foot is down.
MORE TENSION
ww
LESS TENSION'"^^
Pig. 17. Bobbin Kiread Tension
Tension on threads should be as light
as possible while still sufficient to set
stitch in material.
STITCH LENGTH REGULATION
1. Stop machine .
2. Depress button shown in Fig. 19,
3. Turn machine pulley toward you
slowly— until button drops (clicks).
4. Turn machine pulley until desired
stitch length is opposite mark on
arm (see Fig. 20 ),
5. Release button.
Never depress the button while the
machine is running.
Make certain that plunger is disengaged
before starting machine.
I
MORE
TENSION
O o
LESS
TENSION
Pig. 18. Needle IHiread Tension
Pig. 20. Stitch Length
Indicator
BUTTON
Pig. 19. Stitch Length Button Regulator
PRESSER FOOT PRESSURE
TURN TO
ADJUST
MORE PRESSURE
D
LESS PRESSURE.
Pig. 21. Adjusting Pressure
The pressure on the material should be
as light as possible, while still suffi
cient to insure correct feeding.
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THREAD CONTROLLER
The function of the thread controller
spring is to hold back the slack of the
needle thread until point of needle reach
es the goods in its descent, as without
this controlling action of the spring, the
slack thread (especially silk) will some
times be penetrated by point of needle as
needle is descending.
Pig, 22. Adjustment of Thread Controller
To change the thread controller stop
for more controller action on the thread,
loosen set screw Z, and turn thread con
troller spring stop T, Fig. 22 to the
right; for less action, turn thread con
troller spring stop T to the left, after
which securely tighten set screw Z.
It may be found advisable to increase
tension of spring for coarse thread, or
to lessen it for fine thread.
To increase tension of thread controller
on thread, loosen tension stud set screw
Y, located nearly under tension stud, and
turn tension stud A2 slightly to the left.
To decrease tension turn it to the right.
Re-tighten stud set screw Y.
TO SET NEEDLE BAR
See that needle is up in the holder as
far as it will go. There are two lines
across the needle bar about two inches
above the lower end. When needle bar
is at its lowest position, the upper mark
should be just visible at end of needle
bar frame.
In case needle bar is not correctly set,
loosen needle bar connecting stud pinch
screw M, Fig. 23 and place needle bar
in correct position as directed above,
then re-tighten screw M.
TO SET A NEEDLE BAR WHICH HAS NO
MARK
Regulate the stitch length as instructed
on page 6, so that there is no feeding mo
tion, then set needle bar so that when it
rises 3/32 inch from its lowest position
and point of sewing hook is at center of
needle, eye of needle will be about l/l6
inch below point of hook.
RELATIVE POSITIONS OF NEEDLE BAR
AND PRESSER BAR
The distance between the needle bar and
presser bar (after regulating stitch length
so that there is no feed movement) should
be 17/32 inch as shown below.
Fig. 23. Relative Positions of Needle
Bar and Presser Bar
If the distance between needle bar and
presser bar is more or less than 17/32
inch, loosen needle bar frame shaft clamp
screw N2, Fig. 24. While this screw is
loose, needle bar frame can be moved for
ward or backward, as may be required.
1
Pig. 24. To Adjust Needle Rook Frame
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Vintil the distance between the needle bar
and presser bar is 17/32 inch. A piece
of sheet metal 17/32 inch wide may be
used to determine the correct distance.
When the adjustment has been made,
securely tighten screw N2.
TO ADJUST HEIGHT OF
SEWING HOOK
When lower timing mark A, Fig. 26 on
needle bar is just visible at end of needle
bar frame on upward stroke of needle bar,
the hook point should be about 1/16 inch
above eye of needle, as shown in Fig. 26.
To adjust height of hook, fasten throat
plate to bed of machine with bobbin case
stop finger K, Fig. 26, in sewing position.
Use . 032 inch shim. Shim should slide
between bobbin case stop finger K and
throat plate. If the shim is too loose,
turn machine pulley so that socket screws
Fig. 25. Heigjit Adjustment of Seyring Hook
H2, Fig. 25 are accessible with a socket
wrench. Loosen both screws and remove
cloth washer from bobbin case, then turn
Fig. 26. Hei^t Adjustment of Sewing Hook
hook so that a hole in bobbin case is in
line with hook height adjusting screw J2,
Fig. 25. To raise hook, turn down screw
J2. If there is insufficient space for the
shim to pass between bobbin case stop
finger K and throat plate, turn up screw J2
and press down hook. Check timing and
tighten socket screws H2, then turn screw
J2 just enough to leave a light tension.
TO SET SEWING HOOK TO
OR FROM NEEDLE
N
Fig. 27. Adjustments Underneath the Machine
To prevent point of hook from dividing
strands of thread, it should pass as close
as possible to the needle (within the clear
ance above needle eye).
Turn machine pulley over toward you
until point of sewing hook is at center of
needle. Loosen screws N and T, Fig. 27,
underneath bed of machine and move hook
saddle to the right or left, as may be re
quired, until point of hook is as close to
needle as possible without striking it, then
securely tighten screws N and T.
CAUTION; Make sure hook driving gears
U, are set correctly with relation to face
of hook saddle. Use . 008 shim.
The function of hook washer (needle
guard) G2, Fig. 25, which is attached to
bottom of sewing hook, is to prevent point
of hook from striking needle if, when pass
ing through material, needle is deflected
toward hook.
The needle guard can be bent with a small
pair of pliers until it prevents hook point
from striking needle, but it should not be
bent outward enough to deflect needle from
its normal path.
From the library of: Superior Sewing Machine & Supply LLC

TO TIME SEWING HOOK
Regulate the stitch length, as instructed
on page 6, so that there is no feeding mo
tion.
Remove throat plate and turn machine
pulley over toward you until lower mark
across needle bar is just visible at end
of needle bar frame on upward stroke of
needle bar, as shown in Fig. 26. If
needle bar and sewing hook are correctly
timed, the point of hook will be at center
of needle (about 1/I6 inch above the eye)
as shown in Fig. 26.
/c
Pig. 28. Timing Sewing Hook
In case sewing hook is not correctly
timed, turn machine pulley over toward
you until needle bar has descended to
its lowest point and has risen to the po
sition where lower timing mark
across needle bar is just visible at end
of needle bar frame, as shown at A,
Fig. 26. Loosen two socket screws in
hub of hook shaft gear L2, Fig. 28 and
turn hook until point of hook is at center
of needle. Then securely tighten two
socket screws in hook shaft gear L2.
TO REMOVE BOBBIN CASE
FROM SEWING HOOK
(see Fig. 29)
Remove the two hook gib screws W,
from sewing hook, lift off hook gib F2,
and remove bobbin case X.
Fig. 29. To Remove Bobbin Case from
Sewing Hook
TO REMOVE SEWING HOOK
FROM MACHINE
Remove presser foot, throat plate and
feed dog, then loosen two socket screws
in hub of hook H2, Fig. 30 and lift hook
off end of shaft. To remove hook shaft,
first remove screws in ball bearing re-
J2
Fig. 30. To Remove Sewing Hook from Machine
taining cap directly under hook. Next,
tip machine back and loosen set screws
L2, Fig. 28 in hook shaft gear and lift
hook shaft by top end. If shaft does not
lift out easily, loosen screws in cover
plate of hook saddle sufficiently to per
mit oil to drain out, then remove cover,
being careful not to damage the gasket
M2, Fig. 32, page 10, then tap end of
hook shaft.
From the library of: Superior Sewing Machine & Supply LLC

10
CAUTION: The hook is equipped with a
screw in the hub for adjusting the vertical
position of the hook relative to the throat
plate seat. This position is set to a gauge
at the factory. When replacing or install
ing a new hook, care must be taken to see
that the bobbin case stop finger K, Fig. 31
fits correctly in the throat plate. If it is
too high, it will interfere with the free
passage of thread. If it is too low, it may
slip out and cause damage to hook and
bobbin case when machine is in operation.
To make the adjustment, remove cloth
washer in bottom of bobbin case, loosen
socket screws H2, Fig. 30, page 9 in hook
hub, then turn hook until adjusting screw
appears beneath one of the holes in the
bottom of bobbin case. Hold hook down
against its seat and turn adjusting screw
with screwdriver until the proper up and
down position is attained. Tighten socket
screws H2, Fig. 30 in hub of hook.
To remove ball bearing from hook shaft,
rest bearing with shaft-end up on two pieces
of sheet metal placed across the open jaws
of a vise. Tap shaft until bearing is re
moved.
TO ADJUST BOBBIN CASE OPENER
(see Fig. 31)
The bobbin case opener Y should be
set so that it touches the bobbin case as
lightly as possible, yet turns the bobbin
case enough to make a sufficient open
ing for the free passage of the thread be
tween throat plate and bobbin case.
TO TIME BOBBIN CASE OPENER
(see Figs. 31 and 32)
Turn machine pulley over toward you
until lower timing mark on needle bar is
even with end of needle bar frame on up
ward stroke of needle. In this position,
the mark D2, on flange of opener driving
shaft, should line up with reference mark
C2 on hook saddle. If opener shaft is out
of time, tip machine back and loosen
D2 C2
Pig. 31, Adjusting Bobbin Case Opraier
Pig. 32. Timing Bobbin Case Opener
socket screws K2 in opener driving gear
then return machine to upright position
and turn shaft with screwdriver in screw E2
at top end of shaft, then tighten socket
screws K2 in gear.
From the library of: Superior Sewing Machine & Supply LLC