SINGER 281 -1, 281 -3, 281 -21 sewing machine Service Manual

SINGER
281-1,-3-,21
SINGER
Service Manual
Machines
281-1, 281-3 and 281-21
Regulation View — Machine 281-1
au THE SINGER COMPANY
= Copyright € 1964 by The Singer Company
Copyright Under International Copyright Union
Al! Rights Reserved under Inter-American Copyright Union
*A Trademark of THE SINGER COMPANY Printed in U. £. A.
Y rip CONTENTS
DESCRIPTION. .....eocsccroocconaccanoonacconcooeanocacoscocatanca tocas 3
DE o ecaoeroootavaeoo e 4
LUBRICA TION AND CLEANING...........e.eooaoccoorcecorecaeo 4, 5
OPERATION. ......ee0ccocecooacionenrecaoceracoaaoaceca tado oa ae 4, 9
ADJUSTMENT..e....e.enoncccoocaocconorerocoooccacaoaceanreconene 10, 16
Bobbin, Removal and Replacement.........eescoocencarcacerantaare 8
Bobbin Case, Removal and Replacement.....e.eeosrcerucovencacas 8
Bobbin Case, Threading.........e.rrescesaorcoacecacacrcoaranenoracca 8
Bobbin Case Holder, Removal and Replacement.........eosss 13
Centralizing the Feed Dog.........eorecsrcenencenancconaorenas 15, 16
Check Spring, Height Setting.........e.consocacacsreaceareacanecen. 14
Check Spring, Tension Adjustment......e=.eseconconcoorraorerenes 14
Check Spring, Timing...e.....essaccocerorcacocaceoancenecacanerocee, 14
Cleaning.......e..erococcroocenacacoocdanrocenooseccamencacano rece. 6, 13
Description of Machines..........ecercoscencasiaacaoncanacanecacerena. 3
Determining Thread Twist........eeeconaencoonacconerrcarnancectene. 7
Disc Tension.....e..eecerceroocenocavenecoano racer nenanecercran oro. 3
Federal Stitch Type.............esccocnooconeeconcacencacanecca carecen 3
Feed Bar Eccentric Hinge Pin.......eecsoconcccorrcoacaoneones 14, 15
Feed Bar Linkage...............coorcencavencoacocacarone tere. 16
Feed Dog, Centralizing........e.ecececacaccorconcarearenectacee. 15, 16
Feed Dog, Height Settings.........eseoecconrcooceracecacreeres 14, 15
Feed Eccentric Stop Screws Available.....0..0000.0.0..000. 000... 15
Feed Leveling............e.concccarocaccacaooencaocenen eran tratar... 15
Feed, Pendant Link.....ee.ecosnorccooscancacoarccrenarececaverecanere. 3
Filter (Sewing Hook Lubrication)......ee..eesccsococosaoearorce e 5
Guard, Needle,.........eeooceceroococccoaoroncaneccavererenrenencean: 13
A 3
Guide Bracketf........eeessrcaneococcorcacaroconecacantecacenenccenerea. 16
Hook......eercccoroscarrroceacanarcarrroccaranrtantece (see Sewing Hook)
Hook Section......e.e.coconaconcacanaorranocaccaatacecr canario cae. 13
Installatian,......cereneroosoocconoeoonocenenccaacen eee onenoorerecA.. 4
Knee Liffer......ceseceoccsraccocaoocacecagoccanaraoueneneao cea 3, 4
Length of Stitch,.......eeeenrecececonecancoanecaco sente ena. 3, 9, 10
Leveling the Feed.......e...seconccencoconocccoocccancona sgae nace. 15
Lifting Bracket.......eeresscascocaccacoconcan ere cctocoaneoecaracacena. 16
Lint Wiper......e.ec_rceenaccooscosoocosecanecaoracenauean ere. At. ......L 3
Lower ThreadinG....….…ccocuaemremsescesaronsannnesmn see uen ec 0 0u0a00 8
Lubricating System...………ussosenenensansoncescensencenassenneannane0s 3-5
Lubrication,...e..oserccscosrrenacacancaontecco cancer ero area. 4, 5
Machine Base,....eeecocsnecscanocoertenocccocaneaacacereecar necio. 4
Machine Pulley.........eccccoccrococenenoacanececanroccarancacerarene ee, 3
Magnet on Vil Pump.........eccocscecocancsoconeaaua cacaos retenes 6
Materials Sewn...e.eseresoooerccocacaneraoneccactooneecareracurrtaneaces 3
Maximum Stitch Length........e..cesmmccccaconancaoeaccencrcances 3, 15
Needle Bar Bushing (Lower), Setting.........esosecccesacarancen. 10
Needle Bar Height, Setting........essocecorvaneao cocanetoneccaterer. 10
Needie Bar Stroke............eccocococovesnoconoranocaccaaraceortrcanne. 3
Needle Clearance with Hook, Setting,......comrrecorescrnacono 11, 12
Needle Guard at Loop-taking Time...e...coneoscacenaconoenencceos 13
Needle Guard, Stringing....c.ecoocarsocaccoooracanacacearorcicarecees 13
TO ALL WHOMIT MAY CONCERN:
The improper placing
études 18
Needle Recommended.............eeeeusccconrecaocoacararereneaoeooe. 6
Needie, Setting.........e...ecoconconeocooeaoecoracaccorerecaacannen 6, 7
Needle Stoap..........ceseccscacocoonoccarentraoacenactcao ener cacarecos 10
Needle Thread Guard....e.e...ensccccodccncacanecascatensocaooececacae. 3
Needle Threading..........e..ecosnccouensocacesarecencareerecone eno. 7
Oil Flow Regulator.......e..escesoroscoscanereaacacateraterecaocooacon 5
Oil Flow Window........e.e.esrreaoosuconicacoocarorcareareceneteae. 3,5
AT sencec0e 3, 6
Oil Recommendations.....e.eeeesssneccreccoreecan en eoaorecene ee. 5
Qil Reservoir...........eecercoocccccoarecoccoreccanoepencaceaormocena 3,4
Oi! Retaining Collar.......e.e...eeomcoceocoooccoaaceocacarce ene 1]
Oil Spray Pattern..........eecorseccorsccocooccootececaraceoce enema 5
Parts Charts ,.......e.reeeoccorooocarocoorecoo eran e. Rear of Manual
Pendant Link Feed.............eeeccorrcconecacaoaroccontascerecocene. 3
Presser Bar Height, Setting......ec.ereccccoscoracaneneoracece vena. 16
Presser Bar Lift.. .uece.eecooceaaconcanacanareoaneneccon econo. 3, 16
Presser Foot Clearance......e.ecocsanacoccnccodoneran cateo eco: 16
Presser Foot Pressure, Adjustment. ....c.eoncccnonacnononeceucceee. 9
Preventing Unauthorized Changes in Stitch Length........... 10
Position Finger, SettingS........concnocacsoracaaacioanccooceneacene 12
Radial Position of Sewing Hook.......e..ecesevertenteaseaceocacos 1]
Regulator Button (Stitch Length).....c..eescssocccococatecaanes 9, 10
Reservoir......encoocaravocoococecanececracaer car eno canoa e. 3,4
Sewing Hook Clearance with Needle, Setting..........enoo 11, 12
Sewing Hook Filter Screw....e.s..e.ecemvecescarecsocaconeroreeooee 5
Sewing Hook Lubrication,. ....e.e.evrccarccacavocteocansaaacacenrear. 5
Sewing Hook, Oiting Wick.....ececonevacooccacconccnaaneavacacocurena. 5
Sewing Hook, Timing....e..s=eccsouacavocctactacaocanerectrcaneaeeene. 11
Space at Right of Needle..........esccccacocoveronsocarerere care. 3
Speed Recommendations.....e=.eec=acccososocoocooareccoa re cacancare 6
Stitch Length, Maximum.....eeeessesacoccarecaraanortncaranenano 3, 15
Stitch Length, Preventing Unauthorized Changes............. 10
Stitch Length, Regulafion.....e..ee.mnescocioncacocor taa eranec.. 9, 10
Stop Screws (Feed EccentricC)......escanseccooooecanconectren tec. 15
Stringing the Needle Guard......e....escccccorecconcacceocaocenccae. 13
Take-up Lever Movement.....e.erescsooccaceaccaconoertecan cren. l4
Tension of Check Spring, Adjustment.....e.e.eesavecosoneccocere 14
Thread........e.eevoecoocecococrecarecaoneocacara recae cacao eeeoceroee 7
Threading, Lower.....e..e.eoceocococtooccosrenerecaneorastanencooac,. 8
Threading, Upper............ecesrcecococacooccooeacooccocenoccoo receto. 7
Thread Tensions. .....eseeccsorccooccoveovatecaconicacartacaneoceene, 9
HD rante cactarancaceno 11,14
Thread Twist, Determination.......e.concssacococscasrarovacacaroavae 7
Upper Threading........e.sccssroacoraorecoooecacenaracorencaneaceacoone, 7
Unauthorized Changes in Stitch Length, Preventing.......... 10
V-belt.......__.eeccaoccocaceranecoscocacancacaoroccoreraneeocarnan roca 3
Wick, Sewing Hook..........cseesscoccccoctoreocaoonociascacanrano nee. 5
or renewal of the Trademark SINGER” or any other of the Trademarks of The Singer Company
(all of which are duly Registered Trademarks) on any machine that hos been repaired, rebuilt, reconditioned, or altered
in any way whatsoever outside a SINGER factory or an authorized SINGER agency is forbidden.
DESCRIPTION OF MACHINES
Machines 281-1, 281-3 and 281-21 are high speed,
single needle, lockstitch machines designed for sewing
a wide variety of fabrics ranging from light weight to
heavy weight.
Outstanding straight line stitching is produced by
these machines in materials such as wash-and-wear,
synthetic and natural fabrics.
General Features
Balanced, air cooled, rotating hook. Horizontal
axis.
Lint wiper keeps lint and abrasive matter from ac-
cumulating on hook.
Drop feed consisting of pendant link feed with feed
leveling hinge pin.
Pendant link feed mechanism maintains longer feed-
ing cycle.
Three plain superfinished bearings support the
arm shaft.
Fully automatic lubricating system with oil flow
window in direct view of operator.
Knee lifter mechanism integral with machine base
and oil reservoir.
Independent light fixture mount.
Federal stitch type 301.
Improved needle thread guard and other thread hand-
ling parts. Disc tension.
Machinepulley 147139 for 3/8 inch V-belt.
Variations of Machine Varieties
Machine 281-1
Light weight to medium-heavy weight fabrics.
Needle bar stroke, 1-13/64 inches.
Presserbar lift, 5/16 inch.
Maximum stitch length: Feed eccentric stop screw,
regularly furnished, limits the maximum stitch length
to 7 stitches per inch. A stop screw for 5-1/2
stitches per inch will be furnished when specified
on order.
Space at right of needle, 11 inches.
Machine 281-3
Light weight to extra-heavy weight fabrics.
Needle bar stroke, 1-7/16 inches.
Presser bar lift: Regularly furnished with 3/8 inch
lift for sewing light weight to heavy weight fabrics.
Available on order with 7/16 inch lift for sewing
extra-heavy weight fabrics.
Maximum stitch length, 5-12 stitches per inch.
Space at right of needle, 11 inches.
Machine 281-2]
Light weight to medium-heavy weight fabrics.
Needle bar stroke, 1-13/64 inches.
Presser bar lift, 9/32 inch.
Maximum stitch length: Feed eccentric stop screw,
regularly furnished, limits the maximum stitch length
to 7 stitches per inch. A stop screw for 5-1/2
stitches per inch will be furnished when specified
on order.
Space at right of needle, 8 inches.
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HIGH MARK
GASKET
OIL
RESERVOIR
PLUNGER
See that plunger is in place, as shown in Fig. 2,
before placing machine on base.
Machine base and oil reservoir fits into standard
table cut-out and rests on four corners without bolting.
Rasp edges of cut-out, shown in Fig. 2, if necessary,
so that machine does not touch table when placed on
base.
STOP SCREW LOCK NUT
\
ROCK SHAFT
CLAMP SCREWS LIFTER LEVER
REAR STOP DOG KNEE PLATE
Fig. 3. Knee Lifter
LOW MARK
Fig. 2. Machine Base and Oil Reservoir
Use shims on corners, when required to insure that
base is level, so that oil level will be accurately in-
dicated by marks on base.
Machine head is not fastened but should rest on cork
gasket in base. Machine hinge pins must not support
the head except when machine is tilted back.
THEKNEE LIFTER
Knee lifter is shipped assembled to the base ex-
cept for the knee plate and lifter lever.
Loosen the two clamp screws shown in Fig. 3 and
slide the rock shaft forward to position shown. Attach,
lifter lever.
Set the stop screw, Fig. 3, so that there is only a
little play in the lever before it starts to lift the presser
bar. Then tighten lock nut on stop screw.
Set the rear stop dog to allow the presser bar to be
raised to its limit and tighten the two clamp screws.
CAUTION: Do not operate machine until it has been
thoroughly lubricated in accordance with the following
instructions.
LUBRICATION
Before starting machine, the oil reservoir must be
filled to HIGH MARK shown in Fig. 2
Use SINGER OIL “TYPE A” or “TYPE C”. Use
“TYPE C” OIL when an oil is desired which will
produce a minimum of stain on fabrics even after a
long period of storage.
Do not use additives in sewing machine oil, as
they may cause a reduction in normal oil flow that
can result in damage to machine.
Should the oi! flow, passing through the oil flow
window as shown in Fig. 4, stop or become erratic,
STOP MACHINE AND DO NOT RUN AGAIN until the
cause has been eliminated.
Check oil level often to keep it from going below
low mark.
The Oil Flow Regulator
Lubrication of the sewing hook is automatically
controlled by the oil flow regulator shown in Fig. 5.
Regulator is set at the factory for lubrication under
average sewing conditions.
To determine whether oil is properly flowing to the
hook, run machine for approximately one minute to es-
tablish a uniform rate of flow. Then open the bed slide,
hold a piece of paper under the hook and run the ma-
chine for about ten seconds. There should be a distinct
line of oil on paper, beneath the hook bearing, with a
fine spray on each side of this line.
lf there is no trace of oil or an excess of oil on the
paper, turn oil flow regulator to right or left to increase
or decrease the flow of oil, as shown in Fig. 5.
Machine must run at least one minute between ad-
justments to insure uniform oil flow.
If the proper rate of flow cannot be obtained by
turning the regulator inspect the oil flow mechanism
as follows:
Remove needle, bobbin and bobbin case from mo-
chine.
Remove bracket screw and position finger shown in
Fig. 5.
Loosen two hook body screws and turn machine
pulley until feed bar reaches its highest point.
SHOULD SHOW STEADY FLOW OF OIL
y
\
Fig. 4. Oil Flow Window
THREAD GUARD HOOK BODY SCREWS
BRACKET SCREW
Fig. 5. Oil Flow Regulator
OIL FLOW REGULATOR
SEWING HOOK OlL FLOW REGULATOR
FILTER SCREW WICK О.
e. -
ERA
чей ©
Fig. 6. Sewing Hook Filter Screw and Wick
Turn the sewing hook until thread guard is at the
bottom as shown in Fig. 5 and slide hook from shaft.
Loosen filter screw shown in Fig. 6 and check to
see ¡f wick has become detached or clogged.
Inspect all passages for dirt and lint accumulation.
Replace wick if necessary.
Assemble sewing hook and position finger to ma-
chine.
Re-check oil flow as previously instructed.
CLEANING
Using a short bristle brush (not point of scissors or
other sharp instrument), remove lint and other waste
from around sewing hock, from between feed rows and
underside of throat plate and from all other operating
points.
Tilt machine back on hinges. Wrap clean rag around
magnet, shown in Fig. 7, on oil pump body and pull
accumulated foreign particles from magnet.
Wipe exterior of machine dry with a soft cloth.
MAGNET
=
PEE [A
Ad a
TETE
Fig. 7. Magnet on Oil Pump Body
SPEED
Maximum speed for machine 281-1 and 281-21 is
6000 stitches per minute.
Maximum speed for Machine 281-3 is 5000 stitches
per minute.
It is advisable to operate new machines at a speed
of 500 stitches less than maximum, for the first 100
hours of operation.
NEEDLES
Machines 281-1 and 281-3
Use SINGER™ Needle, Catalog 1955, in sizes rang-
ing from 8 to 22.
Machine 281-21
Use SINGER™ Needle Catalog 1361, in sizes rang-
ing from 8 to 22.
Size of needle to be used should be determined by
weight of thread and type of material being sewn.
Orders for needles should specify quantity required,
size number and catalog number.
For example:
100 No. 16, Catalog 1361 Needles
SETTING THE NEEDLE
Turn machine pulley over toward operator until
needle bar reaches highest point as shown in Fig. 8.
Loosen needle clamping screw. Insert needle into
needle bar as far as it will go, with long groove of
needle to the left and eye of needle directly in line
with arm of machine. Then tighten the clamping screw.
THREAD
Left twist thread should be used in needle.
Either right or left twist thread may be used in
bobbin.
Thread twist is determined by holding thread as
shown in Fig. 9 and twirling thread over toward you.
If left twist, strands will wind tighter. If right twist,
strands will unwind or separate.
Rough or uneven thread, or thread which passes
through needle eye with difficulty, will interfere with
successful operation of the machine.
UPPER THREADING
Turn machine pulley over toward operator until
needle bar is at highest point.
Pass thread through threading points indicated in
Fig. 10. Draw approximately two inches of thread
through needle eye with which to start sewing.
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1.
МОУЕ ТО
HIGHEST POINT
3
INSERT NEEDLE UP
LONG GROOVE AS FAR AS POSSIBLE
Fig. 8. Setting the Needle
HOLD THIS END
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TOWARD YOU
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Fig. 10. Upper Threading
LOWER THREADING
Bobbin Removal
Turn machine pulley over toward operator until
needle bar is at highest point.
Reach beneath bed of machine with left hand and
remove bobbin case from machine as shown in Fig. 11.
Release latch and bobbin will drop out of case, as
shown in Fig. 12.
. HOLD LATCH
AND PULL
CASE FROM™ Xx
HOOK
Threading Bobbin Case
Hold bobbin so that thread will unwind in the direc-
Fig. 11. Removing Bobbin Case tion shown in Fig. 13. Hold bobbin case as shown and
place bobbin into it.
3. RELEASE LATCH 7
Pull thread into slot and under tension spring,
shown in Fig. 14, so that thread enters delivery eye
at end of spring.
Bobbin Case Replacement
BOBBIN DROPS OUT
E
4,
+ Place bobbin case on center stud of bobbin case
holder and release latch. Place bobbin case back until
latch catches near end of stud as shown in Fig. 15.
Draw about two inches of thread from bobbin to start
Fig. 12. Removing Bobbin the sewing.
SLOT NEAR “J
\
DELIVERY EYE 7
3. TURN BOBBIN
CASE OVER.
DRAW THREAD
UP AND INTO
DELIVERY EYE
1. PULL THREAD
INTO SLOT
2. DRAW THREAD —
DOWN AND |
| UNDER SPRING
Fig. 13. Replacing Wound Bobbin | Fig. 14. Threading Bobbin Case
1. HOLDING LATCH, REPLACE 2. RELEASE LATCH. 3. PRESS BACK, UNTIL LATCH
BOBBIN CASE ON STUD
> TEE GROOVE IN STUD.
Fig. 15. Replacing Bobbin Case
ADJUSTING THE TENSION
Tension on thread should be as light as possible
while still sufficient to set stitches correctly in mate-
rial.
Regulate needle thread tension, as instructed in
Fig. 16. Make certain presser foot is DOWN during
tension adjustment.
Tighten lock nut to maintain tension adjustment.
Regulate bobbin thread tension as instructed in
Fig. 17.
ADJUSTING THE PRESSURE
Correct presser foot pressure helps insure proper
feeding of material.
Pressure should be as light as possible while still
sufficient to insure correct feeding of material,
Regulate as instructed in Fig. 18 with presser foot
down.
Pressure regulating thumb screw is fitted with
lock nut.
Tighten lock nut to maintain pressure adjustment.
REGULATING THE STITCH LENGTH
Changes in stitch length should never be attempted
while the machine is running.
See page 3 for information on maximum stitch length
for your machine.
Regulate the stitch length, as instructed in Fig. 19.
_ Button mentioned in Step 4, Fig. 19, drops into
notch with an oudible click.
MORE TENSION 1
2. TURN
THUMB NUT
1. LOOSEN
LOCK NUT
—
\ | LESS TENSION
|
|
| i
1
Fig. 16. Needle Thread Tension
TURN
REGULATING
SCREW
+
MORE TENSION Mo > LESS TENSION
Fig. 17. Bobbin Thread Tension
2. TURN
É THUMB SCREW
Fig. 18. Presser Foot Pressure
1. STOP MACHINE
2. DEPRESS BUTTON
3. TURN MACHINE PULLEY
TOWARD YOU SLOWLY
5. THEN TURN MACHINE
PULLEY TO DESIRED
STITCH LENGTH AND
RELEASE BUTTON
4. UNTIL BUTTON
DROPS INTO NOTCH
Fig. 19. Regulating the Stitch Length
о a N - RE = CED ew 8 me ЕЕ Aer = =;
Be ‘zx: PREVENTING UNAUTHORIZED ae E
5 RING ARM TOP Stitch regulator button may be removed by loosening
= 57 о COVER the four screws and removing arm top cover, shown in
2 8 id Fig. 20.
&
Remove retaining ring near tip of button allowing
button to be withdrawn.
Hole in top cover should then be filled by inserting
plug screw 140607 which may be obtained at additional!
charge.
— < \
Fig. 20. Removing Stitch Length Regulator Button
Replace arm top cover.
Inspect and adjust the machine, when it is required,
in the order given.
SETTING THE LOWER NEEDLE BAR
BUSHING
Gauge distance from throat plate seat to bottom of
lower needle bar bushing, as shown in Fig. 21, is - - -
BOTTOM OF
LOWER NEEDLE
BAR BUSHING
BUSHING
2.312 inches for Machines 281-1 and 281-21.
SET SCREW PI
2.599 inches for Machine 281-3.
| 7 281.21 Raise or lower needle bar bushing, as required to
THROAT PLATE vz | > do 281.3) 81-21) obtain correct height setting, after loosening bushing
SEAT | - set screw shown in Fig. 21.
C =
SETTING THE NEEDLE BAR HEIGHT ~~
Remove face plate, slide plate and throat plate.
When needle bar is at its lowest point (during rota-
tion of machine pulley), the gauge distance from throat
plate seat to needle stop in needle bar, as shown in
Fig. 22, is - - -
1.031 inches for Machines 281-1 and 281-3.
0.866 inch for Machine 281-21,
CLAMPING
When needle bar is set at correct height, UPPER
SCREW TIMING MARK on needle bar will be level with bot--
| tom of lower needle bar bushing.
EE Sal mel EE EEE ME EE == = си =
T 1.031” (281-1, 281-3)
Fall 0.866" (281-21)
с =
NEEDLE STOP
THROAT PLATE E
SEAT————1 \)
To set needle bar height, remove face plate, slide
plate and throat plate from machine. Loosen needle bar
> clamping screw shown in Fig. 22. Raise or lower
| needle bar as may be required. Securely tighten clamp-
Fig. 22. Correct Height: Needle Bar
ing screw. Replace all other parts previously removed.
10
TIMING THE MACHINE
Timing the machine consists of first adjusting the
radial position of sewing hook with relation to move-
ment of needle bar and needle thread take-up lever, to
make certain that loop of thread formed by needle will
be correctly taken by point of hook at proper time.
The check spring and feed are then timed to syn-
chronize their motions with needle and hook movement.
TIMING THE SEWING HOOK
Remove slide plate, throat plate, presser foot and
feed dog.
Turn machine pulley over toward operator until
needle bar reaches its lowest point and rises to posi-
tion where LOWER TIMING MARK on needle bar is
level with bottom of lower needle bar bushing, as shown
in Fig. 23.
At this position, point of sewing hook should be at
center of needle, as shown in inset, in Fig. 23.
Loosen two hook body screws shown and turn hook
on shaft as required to bring point of hook to center of
needle. See Fig. 24.
Make certain that hub of hook is against oil re-
taining collar and tighten hook body screws.
Check clearance between needle and hook point,
in accordance with the following instructions.
„SETTING THE CLEARANCE BETWEEN
NEEDLE AND HOOK POINT
i à
Check to see that needle is properly seated in
needle bar and time sewing hook as previously in-
structed.
Point of sewing hook should pass needle as closely
as possible without striking or deflecting needle.
A clearance of about the thickness of a piece of note
paper (approximately .005 inch), as shown in Fig. 25,
is sufficient.
CLEARANCE
ABOVE EYE
LOWER TIMING
MARK LEVEL
WITH BOTTOM
OF LOWER
NEEDLE BAR
BUSHING
HOOK POINT AT
CENTER OF
NEEDLE
HOOK
BODY
SCREWS
Fig. 24. Hook Body Screws
NOTE-PAPER
FLAT OF
HOOK POINT
Fig. 25. Clearance Between Needle and Hook
11
SETTING THE CLEARANCE BETWEEN
NEEDLE AND HOOK POINT (Continued)
To move hook point toward or away from needle,
first remove slide plate, throat plate and bobbin case.
Then, loosen the two bevel gear screws shown in Fig.
26 and loosen bushing set screw shown in Fig. 27.
MAKE CERTAIN THAT BEVEL GEARS ARE
KEPT IN MESH CONSTANTLY UNTIL THEIR SCREWS
ARE SECURELY RETIGHTENED.
HOOK
SHAFT
BEVEL
GEAR
ALWAYS
KEEP
GEARS
IN MESH
. Bevel Gear Screws
LOOSEN
Ca BUSHING
e SET SCREW
\\
| J 1/4" BRASS
DRIFT PIN
zn TAP VERY
CA LIGHTLY
\ N TOWARD
> NEEDLE.
Fig. 27. Position of Drift Pin when
Moving Hook Toward Needle
BOBBIN .018” TO .022"
CASE CLEARANCE
HOLDER —____{
POSITION
FINGER POSITION
FINGER
ol
U)
Fig. 29. Position Finger
12
Using a light mallet and a 1/4 inch brass drift pin,
move hook assembly toward or away from needle as
required. Figs. 27 and 28 show correct placement of
drift pin. TAP VERY LIGHTLY to avoid damaging
hook assembly.
Securely tighten bushing set screw.
Remove all end play from hook shaft by moving
hook assembly firmly against front hook shaft bushing
and, at the same time, moving hook shaft bevel gear
toward sewing hook end of shaft.
Tighten screw 1, Fig. 26, on bevel gear. Securely
tighten bevel gear screw 2, Fig. 26.
Repiace all parts previously removed.
Check thread clearance between position finger
and bobbin case, as instructed next.
LOOSEN
BUSHING
SET SCREW
TAP VERY. UC
LIGHTLY weal» | |
AWAY
FROM NEEDLE
||
1/4"' BRASS
DRIFT PIN 011
x EN
Fig. 28. Position of Drift Pin when
Moving Hook Away from Needle
BRIDGE
SETTING THE POSITION FINGER
Clearance between position finger and bobbin case
holder should be just sufficient to allow thread to pass
‚018 to .022 inch clear-
ance, as shown in Fig. 29, is required. If necessary,
bend position finger CAREFULLY to achieve this
setting.
through easily. Normally an
Top surface of the position finger must be kept
level with the top surface of the bobbin case holder.
STRINGING THE NEEDLE GUARD
HOOK POINT B Incorrect:
Stringing Required
NEEDLE GUARD
Je =
LARGE TL
BOBBIN —\ | 55 Li; NEEDLE TL
CASE RH | HE
HOLDER i Lif
BOBBIN 17H
CASE
A HOLDER
Correct
Relationship
The needle guard on the bobbin case holder, shown
in Figs. 30 and 33, should prevent needle from con-
tacting hook or bobbin case at any time. See Fig. 30
(A) for correct relationship. When large needles (size
20 or larger) are used, needle guard may deflect needle
too far toward left resulting in damage to needle. See
Fig. 30 (B). To avoid this, it may be necessary to
string the needle guard in accordance with the foliow-
ing instructions.
Remove needle, slide plate, throat plate and bobbin
case from machine.
Turn machine pulley until feed bar, Fig. 31, is at
its highest point.
Remove position finger shown in Figs. 29 and 31.
Turn hook body to position shown in Fig. 31 and
remove three small screws and hook section shown.
Turn bobbin case holder until position finger slot
on thread guard is at location shown in Fig. 32 Slip
bobbin case holder out of hook body.
Remove a slight amount of metal from needle guard
by rubbing needle guard along a 1/8 inch strip of very
fine emery cloth, as shown in Fig. 33.
EXTREME CARE should be taken to avoid removal
of too much metal as this may permit needle to strike
hook. See Fig. 30 (C). Bobbin case holder will then
need replacement.
Clean bobbin case holder thoroughly before re-
placing it in hook body.
Replace al! parts in reverse order instructed for
removal.
AZ GUARD
\
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| 5 = ™ : — ;
HOOK POINT
NEEDLE
——
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. : $ — Ay man vo ncorrect
: ME emanan i
> Too Much Metal
Lo — Removed from Guard
3 SMALL
SCREWS
HOOK SECTION
Fig. 31. Hook Section
POSITION FINGER
SLOT ON THREAD
GUARD
BOBBIN CASE
HOLDER
Fig. 32. Bobbin Case Holder
I NEEDLE
GUARD 1/8" #320 EMERY
Fig. 33. Stringing Needle Guard
Thread the machine. Turn machine pulley over
slowly toward operator, observing check spring shown
in Fig. 34.
When take-up lever begins to rise, check spring
should make a slight dip and return to its higher posi-
tion.
As take-up lever approaches top of its stroke, set-
ting the stitch, check spring should be drawn all the
way down.
CHECK SPRING
DIP
STUD
STUD SET SCREW
Fig. 34. Check Spring
FEED DOG TEETH
1/32" FOR "WASH AND WEAR" PARALLEL TO
THROAT PLATE
MATERIAL
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a meme o —_— = = Й == =
- 1 "
THROAT
PLATE
3/64" FOR ALL OTHER MATERIALS
Fig. 35. Correct Height of Feed Dog
FLAT —
SET FOR 3/64'' RISE SET FOR 1/32" RISE
Fig. 36. Feed Bar Hinge Pin (Eccentric)
o
SETTING THE CHECK SPRING HEIGHT
4}
a а
aL e Гей: вт A AD = =
As toke-up lever descends, check spring should
return to rest.
To increase or decrease height of check spring
(which respectively increases or decreases its move-
ment), loosen stud set screw shown in Fig. 34. Turn
stud along with entire check spring assembly to set
check spring height as required. Securely tighten set
screw,
NOTE: Height setting should be checked each time a
different presser foot is used with machine.
SETTING THE CHECK SPRING TENSION
Tension on check spring should be sufficient to
insure action at top speed but light enough to allow
check spring to be drawn all the way down.
To adjust, first make certain that stud set screw
shown in Fig. 34 is securely tightened. Then, using a
screwdriver in slot of stud, turn stud alone toward left
to decrease tension or toward right to increase tension.
SETTING THE FEED DOG HEIGHT
Feed dog height should be adjusted with machine
set for longest stitch. ALL the teeth of the feed dog
should rise equally high above the throat plate, as
shown in Fig. 35.
The correct height of feed dog for wash and wear
fabrics is 1,32 inch above throat plate.
For all other fabrics the correct height is 3/64 inch
above throat plate.
To set feed dog at correct height, loosen the two
hex-head screws shown in Fig. 37.
To obtain a height of 3/64 inch above throat plate,
turn hinge pin eccentric, Fig. 36, until flat on slotted
end is at top as shown.
To obtain a height of 1/32 inch above throat plate,
turn hinge pin eccentric until flat is at bottom.
To raise or lower the REAR END of feed dog, turn
hinge pin eccentric out of set position, as required.
SETTING THE FEED DOG HEIGHT (Continued)
If desired height cannot be obtained as previously
stated, loosen clamp screw on crank shown in Fig. 37.
Raise or lower feed bar as required to obtain desired
height. Securely tighten clamp screw.
Level the feed dog by means of hinge pin eccentric
as previously instructed. Securely tighten the two hex-
head screws shown in Fig. 37.
NOTE: Variations in feed dog height may sometimes
be necessary to balance height in relation to
presser foot pressure.
ou
AVAILABLE FEED ECCENTRIC STOP SCREWS
Machine is prevented from making longer stitches
than a predetermined maximum by a stop screw shown
in Fig. 38, in the feed eccentric.
The following stop screws are available for these
machines:
140256, 7 stitches per inch
140257, 5% stitches per inch
140258, 14 stitches per inch
140568, 8 stitches per inch
CENTRALIZING THE FEED DOG
Feed dog should never contact edges of throat plate
but should move midway between sides of throat plate
slots and maintain its movement equidistant from front
and rear edges of throat plate slots.
Sidewise Setting
To move feed dog toward left or right, loosen the
two clamp screws on feed bar carrier and the clamp
screw on feed bar crank, shown in Fig. 39.
Move feed bar as required to position feed dog mid-
way between sides of throat plate slots.
Make certain that feed dog height is correct as in-
structed previously.
Securely tighten all three clamp screws.
CLAMP SCREW
FEED BAR, |
HINGE PIN |
ECCENTRIC |
Fig. 38. Feed Eccentric Stop Screw
FEED BAR CRANK
CLAMP QCREX
| =
(UT
aa | | —
FEED BAR. 2. 7 Y
ep `
put à |
TWO CLAMP SCREWS FEED BAR CARRIER
Fig. 39. Centralizing the Feed Dog
E
CENTRALIZING THE FEED DOG (Continued)
Lengthwise Setting
Set machine for longest stitch and loosen hex-head
screw, shown in Fig. 40, on rock shaft.
Move feed bar carrier and rock shaft so that move-
ment of feed dog is equidistant from front and rear
edges of throat plate slots.
Securely tighten hex-head screw.
Check linkage for freedom of movement to reduce
wear and insure maximum efficiency.
FEED BAR CARRIER
When presser foot rests firmly on throat plate, with
feed dog below throat plate, there should be a slight
clearance between guide and lifting bracket,
Fig. 41.
shown in
When presser foot is raised to highest point and
needle bar is at bottom of its stroke, top of presser
foot should not contact needle bar.
To adjust for clearonce between guide bracket and
lifting bracket, remove large plug from face plate ana
loosen clamp screw thus made accessible.
This clamp screw is shown in Fig. 41. Face plate
is removed in this illustration only to show entire
presser bar assembly.
Raise or lower guide bracket as required.
Make certain that presser bar is correctly turned,
with needle centered in needle slot (or between the
toes) of presser foot then securely tighten clamp screw.
16
ROCK SHAFT
HE X-HEAD SCREW
Fig. 40. Feed Bar Linkage
SETTING THE PRESSER BAR HEIGHT
CAUTION: Whenever guide bracket has been moved
on presser bar, inspect the check spring for correct
setting as previously instructed.
CLAMP
SCREW
is
CLEARANCE
GUIDE
BRACKET
LIFTING
BRACKET
Fig. 41. Presser Bar Assembly