Brother LS2-F53A Instruction manual

 LS2-F53A INSTRUCTION MANUAL
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
SINGLE NEEDLE UNISON FEED LOCK STITCHER WITH HORIZONTAL
ROTARY HOOK AND REVERSE STITCHING
CONTENTS
1. MAIN PARTS NAMES -......................escccccccccceccecececcereecaecoreceaeaneeaneneareeneanereaenacenenee ne ecaenen ee eecanee e eaneceeeenaeceee. 1
2 SPECIFICATIONS AED 1
3. WORK TABLE AND MOTOR 1100 iscnopeauanssannananmennmen anerensmacencenonans oonnpas FanetarecaVaoae ay evasa=aeAro > 1
A INSTALLATION --.........cccs0cccacoarccoacoaacaaraacanocanarnecanuecaoe een car ene earo cone reaceaanenearaana area an anna ooo nen eo nera nenorancanecesoecececene 3
4-1. Installing the rubber hinge and the corner rubber .......-=====-===c=>=s==ccouovacasncanocanaceaarensecannovavanecnvasence canon 3
4-2. пята ое ой рапс. 3
4-3. installing the machine Néad -..-....--=:==:=:s=e1se<oreneneevorcacóuaanverncona eeca=eca ves onbeNareRrVs tanraootrr ena enarenverepue a naaarnenv Aa 3
4-4. Instalino {Ne SPGOI DIN. -voa a ea ei Ente an ea nn oa na REE EeuN a anar ano tauea rs eteabaia a nea naa 4
4-5. Installing the knee lifler assembly ........ ...-.-..=i.:::i=-i=::e=:4:07t cuereten acaso ueaa La Na naa en Canoa erreabcan eee) rav ane veo Aa ea canas 4
4-6. Installino the DON ..........—-.....=-==-.=-==1e=-e<-aerr nace rta coat o nacer a nunca UN tarea ae cnSrentn er vneavane ener nace one eouaeao UaRa na Lose é NU erTNe rr 5
4-7. Installing the bobbin winder...........................ecerceccece e e DR RR RR eee eee eee neaeeereeeeneeeeeceeanene nene. 5
4-8. Installing the belt guard (L)...........................esecececccccecee ee RR OR IR RR ene nene neeceneneeneenerencenenen nene. 6
4-9. Installing the thread stand .............-.--.::5::mrie temes ce riera no NAS Nace sei urer aus Chana ANIMA a iaeACanSapr a MaNTe rra CRD N the Найт: 6
4-10: LUDricatiÓNn .ioacnesinirrses cissesnnnimsransssnsass sishassssinin crits siasssinnasis sis savas sansnssssssshenssssamads sss hssmisasssnnsssasnsnssssnvhnasnnonssns 7
4-11. Checking the machine pulley rotating direction ..couivessssssisssisasniisininssinannsnissviriusnsssssssinssnssssreanssrsaanmnasas ss 8
5. PREPARATION BEFORE SEWING ..........................ere0ceree ee DD RIOT TÉTÍETEÉEX IR REE ERRE RG OIR IO RR RR RI RI ORG IG RRRIC OREIRO 9
5-1. Installing the needle...............................eeecccceceocececencenee ee eeneneneeeeceece cercare ren ea ee eancececereceneeenenea renacer een. 9
5-2. Removing the bobbin .............................seesesecccccccceocerees ener eeaneencorereeeecerennenen nene onorenceneeeneeneenecercaneeereceree. 9
5-3. Winding the lower thread ................................esccecceroeneeornececeeo reser sees sees naar essere eases san an assess nnananes 10
5-4. Installing the DODDIN e eereneoo o eeeoeee error eeneeeerenereeeeeeaereeeeeUe reee nereeeeveeemeeee 10
5-5. Threading the upper thread esse r eee eessssssss tse sesessssssssssssssssssssssnnssssessanannsssess 11
9-0. AdJUSTING TB SHICH IOMEGA :-....-.--— === reí... evendeoNoesnecazanzerananann oe cannaren vavese cua recen vas prevena ace ren ea aaron an naar aye 11
6. SEVING -. a ere Aa rever ME APE Ep e een ven cenAnn AAA en ACC enDN queen ana CAN Te AVE UA Tape nan 17
6-1. DOWING esc--récuemeentennsenennencennenmnernaivescanvensanssensayss sous cenv nee rmete neurone «e Ea Aa ne Mae mpuaO as rama TARA! [aRAnaRacenanar Va enuaran? 12
6-2. BACKIACKMI ccisississoisssnssnissunuminiianssisssisinnsnsanrtsssnnassass sesanssnsynsnasnsasnsennns eN et aaDo Nan ea ae Napa naaa eo ananoararanao aerRevaTas 12
7. THREAD TENSION oii ciiiiaririisasinmisntizissinsss seinstssuassnasssantasssnsnss sasnass ness sansannenssss sas snsssnussssysevsnnsaossssass 13
7-1. Adjusting the thread tension ........................... seee e O RR I IR O ORI II O ON ORRRR IDO NR RRRO eee eeneneeeeeeeeeeoereeeceeeea 13
7-2. Adjusting the presser foot pressure ........................+..rrrrreerercÉ RD DOTE EOI EI TTD ER RGGGIGGeGeeeeeeeee e e e e: 13
8. STANDARD ADJUSTMENTS -.....................e.eeerereeccceereeee ereccion eee eee eneeneeeeeecerreeeeaeevenee reee cerereeee. 14
8-1. Adjusting the thread controller spring........................==-es==esáecsoorcesnacce eee ee eseao eee eeesceso noe aeoreneoercaros 14
8-2. Adjusting the timing of the needle plate, the needle and the feed dog …………….……..…….……..…..………..….…..….…...…….…… 15
8-3. Adjusting the height of the feed AOG ……….…......….....…......……rrrrrcerrreranerrrreranannerrrrananaanenrenrnnaa nana 16
8-4. Adjusting the height of the needle bar ...........................e.. 2... eee e eee eee e eee 16
8-5. Adjusting the timing between the needle and hook..........................e.....ee e eee esses sees eee seen sees 17
8-6. Adjusting the clearance between rotary hook and opener (thread release finger) ...........................—.. 17
8-7. Adjusting the height of the presser feet ..............................eeeree ee eee e eee eee e ere e erre aereo 18
8-8. Adjusting the presser foot movement amount ..........................eceere De Dí DD ee De e eee 19
8-9. Adjusting the timing of the vibrating presser foot ...............................eere erre ener eee rererereees 20
8-10. Replacing the timing belt.............................. eee ee eee e e eee eee eee 21
9. Safety clutch mechanism .............................e.eeeeeree DIR ORIO O OO OI O e steers eres erases esses sees senses eee esses 22
LS2-F53A
1. MAIN PARTS NAMES
1. MAIN PARTS NAMES
2. SPECIFICATIONS
( >
Needle bar
Finger guard M5
= be o
HF =; Bobbin winder
Belt guard
( N Reverse lever
Vibrating
presser foot
Lifting presser
foot
Feed dog
— Safety clutch mechanism
<Rear of machine>
N A
2. SPECIFICATIONS
Use Medium-thick materials - very thick materials
Sewing speed 2,600 spm
Presser foot height Presser bar lifter 8.5 mm
knee lifter 13.5 mm
Max. stitch length 5.5 mm
Feed dog height 1 mm
Needles DP X 17
-1- LS2-F53A
3. WORK TABLE AND MOTOR
3. WORK TABLE AND MOTOR
Æ Work Table
e When using a table made by another manufacturer, drill holes in the table as shown in the figure below.
e The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and
withstand the vibration of the sewing machine.
TX
(Work table processing diagram Head rest hole Thread stand hole
Motor mounting holes ^^. N 50
N Ne
i Ke N 57403 5 | К
NP 159.05 = A
026 Seat depth 1 >
с? 2-R10 20
я a e
81 E mo > |
ala 7 + со ps | 85— | o +
e k 8 da | ) ~ | & o LO L
| -———220-—— 140 | + a
B - © o oY 10
| © |
| 480 — 1° 7200
6
= | 1051125]
& ` = E у N
И, / TR aaa D
о $ = y + a
> 8
| / 1200 / ae
у, /
Oil pan installation position — Knee lifter installation position
A-A cross section B-B cross section
2C
12mm
\_ 15.5mm J
HE Motor
4\ CAUTION
® All cords which are connected to the motor e Install the correct belt guard which corre-
should be secured at least 25 mm away from sponds to the motor being used.
any moving parts. Furthermore, do not ex-
N cessively bend the cords or secure them too
firmly with staples, otherwise there is the
danger that fire or electric shocks could oc-
cur.
<Motor>
P Motor
e Select the correct motor from those listed in the table. ower 9
e Refer to the instruction manual for the motor for de- Single-phase 110V 2pole, 400W motor
tails on installing and using the motor. Three-phase 220V 2pole, 400W motor
<Motor pulley and V-belt> Sewi
e Select the correct motor pulley and V-belt "9 speed| Frequency | Motor pulley V-belt
by referring to the table to suit the power 2,500 spm 50 Hz Motor pulley 70| 42 inches
frequency of your area. 60 Hz Motor pulley 60 | 42 inches
2.
LS2-F53A
4. INSTALLATION
4. INSTALLATION
4\ CAUTION
O
e
e
e The sewing machine should only be in-
stalled by a qualified technician.
e Ask your Brother dealer or a qualified elec-
trician for any electrical work that may need
to be done.
e The sewing machine weights more than 30
kg. The installation should be carried out by
two or more people.
N e Do not connect the power cord until instal-
lation is complete, otherwise the machine
will operate if the treadle is pressed by mis-
take, which could result in injury.
er e Be sure to connect the ground. If the ground
connection is not secure, serious electric
shocks will result.
47 e Install the belt guard to the machine head.
4-1. Installing the rubber hinge and the corner rubber
a N
Фо ®
AFFE an
\_ ”
4-2. Installing the oil pan
4 >
\ В
4-3. Installing the machine head
a в
N
1. Install the rubber hinge Q on the table with nails
@.(Two places)
2. Install the corner rubber @ at the four corners of
the table with nails @.
Fit oil pan @ into the opening in the table, and
secure it with 4 nails @.
(Refer to the work table processing diagram on
page 2.)
1. Insert the two bed hinge connections @ into the
holes in the machine bed.
2. Fitthe bed hinge connection @ to the rubber hinge
@ and then place the machine head onto the cor-
ner rubber @.
3. Tap the head rest @ into the table hole.
NOTE: Tap the head rest securely into the table
hole. If the head rest is not pushed in as
far as it will go, the machine head will not
be sufficiently stable when it is tilted back.
= 3 - LS2-F53A
4. INSTALLATION
4-4. Installing the spool pin
a В
_ J
4-5. Installing the knee lifter assembly
€ D)
Insert the spool pin @ into the installation hole, and
screw it in tightly.
1
Assemble the knee lifter assembly @ as shown in
the illustration.
Install the knee lifter assembly @ on the back of
the table with 3 screws @. (Refer to the work table
processing diagram on page 2.)
Adjust the knee lifter.
1)
2)
3)
4)
Lower the presser foot @ by using the presser
bar lifter @.
Loosen the bolt @ and @.
Move the thrusting bar complete @ and the
knee lifting straight bar @ to adjust so that the
clearance between the roller @ and section (A)
of the thrusting bar complete @ is approxi-
mately 2 mm at the middle of section (A).
Tighten the bolt @ and @.
After adjusting, push the knee pad @ and check
that section (A) lifts up the roller @.
The presser foot @ will be raised by approximately
13.5 mm when the knee pad @ is pushed as far as
it will go.
LS2-F53A
4-6. Installing the belt
3
7
Го
N AM
2.
3.
4.
>
1
2.
3.
4.
J
„В.
4. INSTALLATION
Remove the screw @ and remove the belt guard
upper cover @.
Tilt back the machine head, and then place the belt
@ onto the motor pulley and the machine pulley.
Turn the nut @ to adjust so that there is 15-20 mm
of deflection in the belt @ when it is pressed with
a finger with a force of 9.8 N (1 kgf).
Insert the belt guard upper cover @ into the belt
guard @ from above the pulley, and then tighten
it with the screw OQ.
Push down the bobbin set lever @ as far as it will
go.
Place the bobbin winder pulley @ so that it pushes
the belt @ by approximately 5 mm, and then place
the bobbin winder @ so that it is parallel with the
belt hole in the work table.
Install the bobbin winder @ to the work table with
the two screws @.
Pull the bobbin set lever @ back and check that
there is approximately 5 mm of clearance between
the bobbin winder pulley @ and the belt @.
LS2-F53A
4. INSTALLATION
4-8. Installing the belt guard (L)
-
. Tilt back the machine head, and then remove the
V-belt from the motor pulley.
While tilting the machine forward, insert belt guard
(L) @ into the belt guard @ from underneath, and
let it rest there.
Place the V-belt back onto the motor pulley.
Install belt guard (L) @ with the two screws Q so
that there is no clearance between the belt guard
O and belt guard (L) @ (position (A)), and so that
the reverse lever @ and the belt guard @ are not
touching (positions 8 and ©).
E \ Assemble the thread stand as shown in the illustra-
*
tion, and then install it to the work table.
Securely tighten the nut @ so that the thread stand
does not move.
LS2-F53A
4. INSTALLATION
4-10. Lubrication
ДД CAUTION
e Do not connect the power cord until lubrication has been completed, otherwise the machine may
operate if the treadle is pressed by mistake, which could result in injury.
e Be sure to wear protective goggles and gloves when handling the lubricating oil, so that no oil gets
O into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil under any circumstances, as it can cause vomiting and diarrhoea.
Keep the oil out of the reach of children.
e The sewing machine should always be lubricated and the oil supply replenished before it is used for the
first time, and also after long periods of non-use.
e Use only the lubricating oil (Nisseki Sewing Lube 10) specified by Brother.
и
~
e Add 1-2 drops of oil in the places indicated by the arrows.
Add oil to other sliding parts also, while being careful to avoid oil leaks.
e Oiling must be done at least twice daily in continuous use.
Ще
LS2-F53A
4. INSTALLATION
4-11. Checking the machine pulley rotating direction
A\ CAUTION
® Do not touch any of the moving parts or place any objects against the machine while sewing, as
/A this may result in personal injury or damage to the machine.
С \ 1. Insert the power cord plug into the wall outlet, and
| then turn on the power switch.
| © "NN 2. Depress the treadle and check that the direction
| of rotation of the machine pulley matches the di-
|
rection of the arrow @.
| O * If the direction of rotation is reversed, change the
direction of rotation to the correct direction while
referring to the instruction manual for the motor.
- В - LS2-F53A
5. PREPARATION BEFORE SEWING
5. PREPARATION BEFORE SEWING
5-1. Installing the needle
4) CAUTION
e Turn off the power switch before installing the needle. The motor will keep turning even after the
power is switched off as a result of the motor's inertia. Wait until the motor stops fully before
starting work. The machine may operate if the treadle is pressed by mistake, which could result in
injury.
( \ 1. Turn the machine pulley toward you to move the
needle bar to its highest position.
Loosen the screw @.
3. Holding the needle @ with its long groove facing
left, insert all the way into the needle bar.
4. Tighten the screw @.
Long groove
N y
5-2. Removing the bobbin
4\ CAUTION
e Turn off the power supply before removing the bobbin. The motor will keep turning even after the
A power is switched off as a result of the motor's inertia. Wait until the motor stops fully before
starting work. The machine may operate if the treadle is pressed by mistake, which could result in
injury.
(7 \ 1. Raise the needle @ to its highest position, and
open the bed slide @ while pressing down on it.
2. Pull the rotary hook latch @ upward, and then re-
move the bobbin @.
- © - LS2-F53A
5. PREPARATION BEFORE SEWING
5-3. Winding the lower thread
4\ CAUTION
A
Do not touch any of the moving parts or place any objects against the machine while winding the
lower thread, as this may result in personal injury or damage to the machine.
=
N
E
A
Thread winding amount
A
4. Installing the bobbin
Turn on the power switch.
Place the bobbin Q onto the bobbin winder shaft
o.
Wind the thread several times around the bobbin
O in the direction indicated by the arrow.
Push down the bobbin set lever @.
Raise the presser foot with the presser bar lifter.
Depress the treadle. Lower thread winding will
then start.
Once winding of the lower thread is completed,
the bobbin set lever @ will return automatically.
If the thread cannot be wound on evenly, loosen
the screw @ and move the bobbin winder bracket
O to the side where there is less thread.
Turn the adjustment screw @ to adjust the bob-
bin winding amount.
® To increase the winding amount: Tighten the
screw.
® To decrease the winding amount: Loosen the
screw.
Note: The amount of thread wound onto the
bobbin should be a maximum of 80% of
the bobbin capacity.
A CAUTION
A
Turn off the power supply before installing the bobbin. The motor will keep turning even after the
power is switched off as a result of the motor's inertia. Wait until the motor stops fully before start-
ing work. The machine may operate if the treadle is pressed by mistake, which could result in injury.
i
- 10 -
Turn the machine pulley to raise the needle to its
highest position.
Insert the bobbin @ into the rotary hook @ so that
the winding direction is as shown in the illustration.
Return the rotary hook latch @ to its original posi-
tion.
Pass the thread end through the slit in the rotary
hook.
Pass the thread under the tension spring @.
Pass the thread through the clearance between ro-
tary hook @ and opener @.
Pull out about 50 mm of lower thread as shown in
the illustration.
Gently close the bed slide.
Be careful not to clamp the thread between the
needle plate and the bed slide at this time.
LS2-F53A
5-5. Threading the upper thread
5. PREPARATION BEFORE SEWING
4\ CAUTION
A
Turn off the power switch before threading the upper thread. The motor will keep turning even
after the power is switched off as a result of the motor's inertia. Wait until the motor stops fully
before starting work. The machine may operate if the treadle is pressed by mistake, which could
result in injury.
4 7 Turn the machine pulley and raise the thread take-up
lever @ to its highest point before threading the up-
per thread. This will make threading easier and it will
prevent the thread from coming out at the sewing
start.
N J
5-6. Adjusting the stitch length
e Turn off the power switch before adjusting the stitch length. The motor will keep turning even after
the power is switched off as a result of the motor's inertia. Wait until the motor stops fully before
starting work. The machine may operate if the treadle is pressed by mistake, which could result in
injury.
No. of stitch (stitches/inch) = 6 7 8 9 10 | 12 | 16 | 20 | 24
Stitch length (mm) 5 4.2 | 3.6 | 32 | 2.8 | 25 | 2.1 | 16 } 14 1
/ X 1. Hold the feed regulator button @ depressed and
pal turn the pulley slowly forward so that the feed
= Е с regulator button @ enters the groove in the feed
Na, Ee eccentric @.
1 Co (When the feed regulator button @ is inserted into
AW a E the feed eccentric @), the feed regulator button @
will move further in and the turning of the ma-
y chine pulley will become heavier.)
ol = \ 2. Whi |
= у, ile pressing the feed regulator button @, turn
the pulley back and forth until the stitch number
indication is visible in the belt guard window @.
3. Release the feed regulator button @.
(Check that the feed regulator button @ pops up.)
Note: Do not press the feed regulator button @
during sewing machine operation.
J
= 11 - LS2-F53A
6. SEWING
6. SEWING
A CAUTION
® Attach all safety devices before using the sewing machine. If the machine is used without these
A devices attached, injury may result.
e Turn off the power switch at the following times. The motor will keep turning even after the power
is switched off as a result of the motor's inertia. Wait until the motor stops fully before starting
work. The machine may operate if the treadle is pressed by mistake, which could result in injury.
® When threading the needle
® When replacing the needle and bobbin
e When not using the machine and when leaving the machine unattended
e Do not touch any of the moving parts or place any objects against the machine while sewing, as
this may result personal injury or damage to the machine.
6-1. Sewing
и ~N 1. While holding the upper thread with your fingers,
turn the machine pulley by hand toward you until
Ÿ the lower thread comes out onto the feed dog.
alll
EM
= ° "en v
ZU \
STN \
=
Lower thread
2. Pull the lower thread toward you and check that it
pulls out smoothly.
Turn on the power switch.
Depress the treadle to start sewing.
Lower thread
6-2. Backtacking
7
When the reverse lever @ is pushed, the material feed
direction will be reversed, and when it is returned to
its original position, the feed direction will change back
to normal.
- 42 - LS2-F53A
7. THREAD TENSION
7. THREAD TENSION
7-1. Adjusting the thread tension
Upper thread ———=
Good even stitches
N
RSI RSIS IRS
Lower thread —%=
Upper thread tension too weak or lower thread tension too
strong
Upper thread tension too strong or lower thread tension
too weak
A H Upper thread tension
The tension of the upper thread is adjusted using the
tension thumb nut @.
To increase the tension of the upper thread, turn the
tension thumb nut @ to the right. To decrease ten-
sion, turn the tension thumb nut @ to the left.
H Lower thread tension
A CAUTION
e Turn off the power supply before adjust-
A ing the lower thread tension.
The motor will keep turning even after the
power is switched off as a result of the
motor's inertia. Wait until the motor stops
fully before starting work. The machine
may operate if the treadle is pressed by
mistake, which could result in injury.
DN
The tension of the lower thread is adjusted using the
screw @.
To increase the tension, turn the screw @ to the right.
_) To decrease tension, turn the screw O to the left.
7-2. Adjusting the presser foot
pressure
Adjust the presser foot pressure to lower as much as
possible so that the presser foot can properly hold
down material by turning the screw @.
=
- 13 - LS2-F53A
8. STANDARD ADJUSTMENTS
8. STANDARD ADJUSTMENTS
A\ CAUTION
N
©’
ás
Maintenance and inspection of the sewing
machine should only be carried out by
qualified personnel.
Ask your Brother dealer or a qualified elec-
trician to carry out any maintenance and
inspection of the electrical system.
If any safety devices have been removed,
be absolutely sure to re-install them to their
original positions and check that they op-
erate correctly before using the machine.
A
A
Turn off the power switch and disconnect
the power cord from the wall outlet at the
following times, otherwise the machine
may operate if the treadle is pressed by
mistake, which could result in injury.
However, the motor will keep turning even
after the power is switched off as a result
of the motor's inertia. Wait until the motor
stops fully before starting work.
® When carrying out inspection, adjust-
ment and maintenance
e When replacing consumable parts such
as the rotary hook
If the power switch needs to be left on when
carrying out some adjustment, be ex-
tremely careful to observe all safety pre-
cautions.
8-1. Adjusting the thread controller spring
More action
Less action )
EM Operating range of spring
The standard operating range for spring @ is 5-10mm.
1. Loosen the screw @, and then turn the thread con-
troller spring stop @ to adjust the operating range.
® For more operating range, move the spring
stop @ to the right.
® For less operating range, move the spring stop
O to the left.
2. Tighten the screw @.
IM Tension of the spring
The standard tension for spring @ is 0.39-0.78 N (40-
80g).
1. Loosen the tension thumb nut @ and screw @.
2. Turn the tension stud @ to adjust the tension.
e To increase the spring tension, slightly turn the
tension stud @ counterclockwise.
® To decrease the tension, turn the stud @ clock-
wise.
3. After adjustment, tighten the tension thumb nut
© and screw @.
- 14 -
LS2-F53A
8. STANDARD ADJUSTMENTS
8-2. Adjusting the timing of the needle plate, the needle and the feed dog
(7 > H Adjusting the feed dog position
o (longitudinal)
uma 1. Set the feed amount to the smallest setting.
° | 2. Loosen the screws @), and then move the crank
© IE a O to set the center of the needle hole in the feed
E N TV dog @ and the center of the rotary hook to the
oP cla 7 ositions shown in the illustration.
7 Y 9 - 5 ;
DC (QA 3. After adjusting, tighten the screws @.
P
1.5mm
HOUR
ПИН
ес
J\
B Positions of the needle and needle hole of the
feed dog
Turning the pulley to lower the needle bar @ slowly,
check whether the needle descends to the center of
the needle hole of the feed dog or not.
If the needle does not enter into the center of the hole:
1. Loosen the screw @ through the window of the
arm @.
2. Holding the needle bar rock frame @, move it as
may be required to get the correct position to the
feed dog. Then, tighten the screw @.
- 15 - LS2-F53A
8. STANDARD ADJUSTMENTS
8-3. Adjusting the height of the feed dog
a The maximum height of the feed dog Q from the sur-
8-
|
/
<Needle bar highest point> Needle
Needle plate
21.8mm
<Needle bar lowest point>
| Hook point .
4.7mm
*
“16 -
>
face of the needle plate @ is normally 1 mm.
To adjust the height of the feed dog:
1.
Tilt the machine head away from you. Turn the
pulley to raise the feed dog Q to its highest posi-
tion.
Loosen the screw @.
Raise or lower the feed dog @ as necessary.
Tighten the screw @.
4. Adjusting the height of the needle bar
\ When the needle bar @ is at its highest point, nor-
mally the measurement between the surface of the
needle plate and the upper end of the needle eye is
21.8mm.
1.
Loosen the screw @ and move the setting posi-
tion of the needle bar @ to get the correct posi-
tion.
Tighten the screw @.
There is another method for this adjustment by
setting the needle bar to its lowest point. There
should be 4.7 mm from the hook point to the up-
per end of the eye of a needle.
These distances are given as a guide ; they should
be checked again when adjusting timing between
the needle and the hook.
LS2-F53A
8. STANDARD ADJUSTMENTS
8-5. Adjusting the timing between the needle and hook
( | в
Hook point \ Needle center
2.5mm
: E
2.2mm
<Needle bar lowest position> у
7 point
Needle bracket
0.02 —0.1mm
A
À '
E DEA EE DY
[X X X X \ X 1\\}
Center
\ J
ON
-17 -
1. Adjust the needle bar height. (See P.16.)
2. Set the feed amount to the smallest setting.
3. Turn the machine pulley toward you until the
needle bar reaches its lowest point.
Continue turning and allow the needle bar to raise
about 2.2mm while on its upward stroke. With
needle bar in this position, the point of the sewing
hook should be at the center of the needle, and
normally, the measurement between the hook
point the upper end of the needle eye should be
2.5mm, further the clearance between the hook
point and the needle hollow should be about 0.02
to 0.1mm.
The needle should slightly contact the needle
bracket.
* If they are not measured as above, perform the
adjustments below.
Hl Adjusting the timing
1. Loosen the two screws = of the hook driving gear
, disengage the gear @ and fook driving pinion
, and then move them apart slightly.
2. Turn the machine pulley to raise the needle bar
by 2.2mm from its lowest position.
3. Move the rotary hook to align the tip of the rotary
hook with the center of the needle.
4. Align the center of the hook driving gear @ with
the center of the fook driving pinion ©. and then
tighten the screws @.
5. Turn the machine pulley to check that the needle
and rotary hook timing is correct.
* If the timing is not correct, move the hook driving
gear @ sideways to make fine adjustments.
® |f you would like to increase the rotary hook
speed with respect to the needle, move the
hook driving gear @ to the right.
e If you would like to decrease the rotary hook
speed, move the hook driving gear @ to the left.
6. Once the timing has been set, tighten the two
screws @.
BM Adjusting the clearance
1. Loosen the screws @ and @.
2. Adjust the clearance by sliding the rotary hook
bracket @ to the right or left as may be required.
3. Tighten the screws @ and @.
8-6. Adjusting the clearance between rotary hook and opener
(thread release finger)
Adjust the clearances between rotary hook @ and
opener @ to 0.1-0.2 mm when opener @ have re-
tracted fully in the arrow direction by loosening screw
® and moving opener @ to the right or left.
* After the adjustment, tighten screw @ securely.
LS2-F53A
8. STANDARD ADJUSTMENTS
8-7. Adjusting the height of the pre
(
|
y
1 < 13 ¢
— yl
5
- 18 -
sser feet
The standard height for the lifting presser foot @ is
8.5 mm when the presser foot has been raised by the
presser bar lifter @.
1. Loosen the screw @), raise the presser bar lifter
O. and then loosen the set screw @.
2. Move the lifting presser foot @ up or down to ad-
just its height.
Tighten the screw O.
Tighten the screw @ to adjust the presser foot
pressure. (Refer to page 13.)
NOTE: If the height of the lifting presser foot @
is changed, the movement amount of the
lifting presser foot @ and vibrating
presser foot @ will change. Adjust the
amount of movement of the vibrating
presser foot @ so that it matches the
movement of the lifting presser foot @.
(Refer to page 19.)
LS2-F53A
8. STANDARD ADJUSTMENTS
8-8.Adjusting the presser foot movement amount
( Movement amount for
lifting presser foot
Movement amount for
vibrating presser foot
=
FAN
e Vibrating presser foot @ and lifting presser foot @
move up and down alternately.
e Normally, vibrating presser foot @ and lifting
presser foot @ operate to the same height in their
vertical motions. (Standard height 3.2mm)
e The maximum height of vibrating presser foot @
and lifting presser foot @ is 5.0 mm.
If changing the movement amounts of both the lifting
presser foot and vibrating presser foot simultaneously,
use method (A); if increasing the movement amount
for only one (thereby decreasing the movement of the
other), use method (B).
Method (A): Simultaneous adjustment of the move-
ment amount for both the lifting presser foot and vi-
brating presser foot
1. Loosen nut @.
2. Move nut @ up or down as suitable to the work.
(Raise the nut @ for increasing motion; or lower it
for decreasing motion.)
3. Tighten the nut @.
Method (B): Adjustment of the movement amount
for the vibrating presser foot
1. Loosen the vibrating presser bar screw @ and
lower the presser bar lifter @.
2. While holding the vibrating presser foot @), loosen
the bolt @ and then move the presser foot @ up
or down as necessary.
3. After positioning the vibrating presser foot @,
tighten the bolt @.
4. Tighten the vibrating presser bar screw O.
- 19 - LS2-F53A
8. STANDARD ADJUSTMENTS
8-9. Adjusting the timing of the vibrating presser foot
N Check the vibrating presser foot timing as follows:
( <When the needle lowers>
|
1. Lower the presser bar lifter lever, then turn the
Needle pulley toward you. At this time, the vibrating
lifting | presser foot should reach the feed dog before the
presser foot | needle eye does.
vibrating 2. When the needle is raised, make sure the vibrat-
foot . : ; - ial fi
Re ing presser foot is still holding the material firmly.
If the vibrating presser foot rises while the needle
| is still penetrating to the material, it may cause
skipped stitches, etc.
<When the needle raises>
Needle
\
|
sil | |
Ee \
lifting presser foot \
Nr ty
= 2)
vibrating presser foot ———<- -
»
Feed dog
If the timing is not correct after you make these ad-
justments:
\ 1. Loosen the two screws @.
— 75
2. To synchronize the timing of the vibrating presser
/ ® foot, turn the cam @.
.1—— A 3. Tighten the screws @.
arm shaft US / =
ol
|
OD ©
a
u J
- 20 - LS2-F53A
8-10. Replacing the timing belt
т
=
= \ Screw stop)
И
| “А
Ll]
wi
a
go
8. STANDARD ADJUSTMENTS
H Removing the timing belt
1;
Remove the timing belt @ from the safety clutch
pulley @.
Remove the belt guard upper cover.
Remove the arm cap @ and loosen the two set
screws @.
Loosen the two set screws @, remove the screw
@, then pull out the pulley @ from the arm shaft
O.
Loosen the set screw @ and pull out the ball bear-
ing adapter @ through the arm hole.
NOTE: Removing and putting on the timing belt
@ is made through the arm hole.
H Putting on the timing belt
Insert the new timing belt @ through the arm hole
and place it onto the belt pulley (upper) @.
Place the ball bearing adapter @ onto the arm shaft
©. and then tighten the set screw @.
Place the pulley @ onto the arm shaft @, and then
tighten the set screws @ and the screw @.
NOTE: Install the pulley @ so that the leading
set screw @ (when the pulley is turning)
is set into the V-shaped screw stop on the
arm shaft @.
Tighten the screws @.
5. Turn the pulley towards you until the take up le-
ver reaches its highest point.
Turn the lower shaft ® until the arrow on the bear-
ing adapter sleeve (® aligns with the dot.
Put a new timing belt @ on the safety clutch pul-
ley @.
Replace the arm cap @ and belt guard upper cover.
LS2-F53A
9. Safety clutch mechanism
9. SAFETY CLUTCH MECHANISM
If the thread is tangled with the rotary hook during sewing, the safety clutch mechanism for the safety clutch
pulley operates to stop the lower shaft and let the safety clutch pulley race off load, thereby protecting the
rotary hook and timing belt.
Release the safety clutch mechanism as mentioned below.
MM Releasing the safety clutch mechanism
A\ CAUTION
x
Turn off the power switch before releasing the safety clutch mechanism. The motor will keep turn-
ing even after the power is switched off as a result of the motor's inertia. Wait until the motor stops
fully before starting work. The machine may operate if the treadle is pressed by mistake, which
could result in injury.
‚ \ 1. Remove the thread, etc. entangled with the rotary
hook.
NOTE: Do not use a sharp-edged tool to clean
the hook, as doing so may damage the
hook.
2. Slowly turn the machine pulley @ backward while
pressing push button @ and the safety clutch
mechanism returns to the original position.
(Safety clutch locking lever @ must be correctly
in the groove of safety clutch collar @.)
- 22 - LS2-F53A
9. Safety clutch mechanism
> IM Safety clutch mechanism engaging tension
The safety clutch mechanism engaging tension is
Tess N weakest when the arrow on lever screw hinge pin @
Z points to the center of the lower shaft; and increases
as it points outward.
1. Remove the timing belt @.
2. Loosen screw @, and adjust by turning lever screw
hinge pin @.
Lower shaft 3. After the adjustment, tighten screw @ securely.
Put the timing belt @ on the safety clutch pulley.
(See P.21, 5-7.)
24 LS2-F53A
INSTRUCTION MANUAL
BROTHER INDUSTRIES,LTD. NAGOYA,JAPAN
Printed in Japan
FS3A
S9153A-00
1996.03H