Brother LH4-B814-2 User manual

INST .RUCTION MANUAL
FOR
BROTHER LH4-B814-2, -3, -5
BROTHER INDUSTRIES, LTD.
NAGOYA, JAPAN
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~ FEATURES ~
~ MACHINE MODELS ~ ............... ... . .
~ STITCH PA:rTERNS »............ ...... ..
«A. SETTING UP » .. ..................... .
[I]. In st allation of th e Motor Pulley . . . . . . . . . . . . . . . I
~- In sta llation of th e Head Base..... .. ... . ..... .. 2
!3]. I nstallation of the Mach ine Head . . . . . . . . . . . . . . 2
@. Putting Flat Belts On . . . . . . . . . . . . . . . . . . . . . . . . 3
~- In stallat i on of th e Pedals and C hain s. .. . . . . . . . . 3
[2] . Ins tallation of the Accessories . . . . . . . . . . . . . . . . . 4
~ B . OILING AND TRIAL OPERATION ~ .. . . 6
[1]. Oiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
~- Oiling System Adjustment . . . . . . . . . . . . . . . . . . . . 6
~- Trial Operation................ . ....... ...... 7
~C. CORRECT OPERATION ~ . . . . . . . . . . . . . . 7
• Large work space for easy sewing.
e Buttonhole stitch width, s titch length, numb er of
s titche s per butt onho le and oil s uppl y rate ca n be
easily adjusted without tilting the machine head .
e If the upper thread break s, the cutter loc king
device will work.
• Spec i al endless flat belts are emp l oyed for slip-free,
positive s
tarting and slowdown. A tens io n pulley
allows easy belt adjus tment.
e The machine opera tes quietly with a minimum of
vi brat io n, and ha s great durability.
e Longitudial and crosswise ru lers are provided as
accessories.
~- Winding L ower Thr ead.. .......... . .......... 8
~- Fitting Bobbin Case into Pl ace . . . . . . . . . . . . . . . . 8
~- Sewing . .. .. ... .. ..... .. .. . ...... .. . ........ 9
!21. Thr ead T ensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
rll. Thread Tak e -up Sprin g Adjus t ment . . . . . . . . . . . . I0
~- Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I0
~ D. STANDARD ADJ US TME NTS ] ......... II
[1] . eed le and Hook Timing Adjus tment ...... . ... II
~- Pre sser Spring Pr ess ur e Adjustment ... . ..... . . . 12
~ - Cutter I nstallat ion and Adjustme nt . . . . . . . . . . . . 12
~- Ch anging Number of Stitches per B uttonhole . . . 13
~- Butt o nhol e Stitch Width and Reference
Positi on Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 14
!21. C utt er Lo cki ng De vice Adjustment .. ...... .... . 15
[ZI. Upper Thread Sc issors Adjustment. . . . . . . . . . . . . 15
~- Upper and Lower T ens ion Re gu lator
Thr ead Release Adjustment ................... 15
~- Clutch Br ake Adjust ment ............... ...... 16
[I]. Fitting eedle into Pla ce . . . . . . . . . . . . . . . . . . . . . 7 ~ TROUBLE SHOOT ING ~ . . . . . . . . . . . . . . . . . . 17
[2] . Upper Threading . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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~ MACHINE MODELS ~
Model LH 4-B814
Su b-class - 2 -3
- 5
men's and
men's and
Main usc women's
Kn itwork women's
gar ments
garments
Ma x. sewing speed 3.200 rpm 2,800 rpm
N
o.of ~titc h es
60 to 360
p er buttomhole
Feed system Upper and lower feed Upper feed
Bottonhole length 6.5 -32 mm
32-48 mm
Bot tonhole wid th 2-6 mm
Max. sewing th ic kness
4mm
3.5 mm
5mm
Max. clamp li ft 13.0 mm 12.5 mm 12 mm
Needle bar s tr oke 35.7
mm
Needle
DP X 5
Lubr icati on Automa t ic
Tape Win der
Installed
-----
(STITCH PATTERNS ~
Whip stitch
Fro nt side Back side
Only th e upp er thr ead runson the top of the work and on ly the
lower thread on th e ot her side in zigzagform as zigzagstitches
formed
by a lock stitch zigzag machine.
~ A. SETTING UP ~
[]] . Installation of the Motor Pulley
0 C utter
f) Needle bar
8 Face plate
Purl stitch
0 Thread retain er 8 Cam cover
0 T op cover 0 Belt cover
0 Handle f) Emergency s top lever
Fron t side B ack si de
The upper thread runs stra ig ht under an increased ten sion and
the l
ower thre ad runs ac ross the upper thread from both right
and left.
( I) Slide motor pu ll ey f) onto motor sh aft 0, see th at the
screw holes in the
motor pulley matc h the scr ew seats on
the motor sh af t, and tig ht en set screws e sec ur ely.
- 1 -
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121. Installation of the Head Base
(I) Loosen screw 8 on the back of
bed
0. and remove pump belt 8.
Place bed 0 on table 8.
(2) Place V-belt 8 aroundhigh-speed
pulley 8 and the larger-diameter
groove
of the motor pulley.
About 15 -20 mm
(3) Putpump belt8 on. Slightlypress
pump belt tension lever0 tomake
pump belt 8 tense, and tighten
screw
8.
(4) Place V-belt 0 around low-speed
pulley 0 and thesmaller-diameter
groove of the motor pulley.
(5) Install bed 0 and fasten
it with wood screws fli) so that V-belts 8 and 0 will
given in about 15 to 20 mm when pushed with yourfinger and that motor pulley,
high-speed pulley 8 and low-speed pulley 0 are in line.
* Motor pulleys and V-belts for 50Hz and 60Hz areas are different.
Select the right ones by referring to the table below.
Sub-class Machine Speed Frequency Motor Pulley V-belt 8 V-belt 0
3200 rpm 50Hz Motor Pulley
50 43" 42"
60Hz Motor Pulley 60 41" 41"
-2·-3
50Hz Motor Pulley
60
41" 41"
2800 rpm 60Hz Motor Pulley
60-2800
40" 41"
-5
2800 rpm 50Hz Motor Pulley
60 41"
41"
60Hz Motor Pulley
60-2800
40" 41"
~.Installation of the Machine Head
1. Installation of the head
2. Installation of the tension pulley assembly
Insert head hinges 0 into machine head 8 ,and tighten
screws
8. Then place machine head 8 onthe bed. Drive head
rest 8 into the table.
Engage tension pulley
pawl8 with tension lever ratchet 0.
and install tension pulley assembly 0 with screw 0.
-2-
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~. Putting Flat Belts On
(I) Raise the clutch, pass flat belt 0
into belt guide D 8 and put the
belt around the low-speed pulley
and tension pulley
8.
(3) While pressing flat belt 0 from
above, turn idle
pulley& andslide
it into belt guide U 8 .
(2) Pull flat belt 0 out of the opening
in the back of the bed.
~~=~Reference
lines meet
( 4) Push tension lever 8 to align the
reference lines.
* If flat belt 0 is too tight, return
tension lever
8.
* Push the emergency stop lever and insert the clutch stopperinto the stop cam. Move flat belt 0 to the innerside of thelow-
speed pulley and idle pulley
8.
151. Installation of the Pedals and Chains
Loosen he_xagonal bolt 0. and fit two
pedals 8 and four pedal stops 8 onto
support shaft
8. Fasten pedal stops8
with screws 8 at positions where the
pedals will move lightly.
Connect hook 8 tolowerthread cutter
lever
0. run chain 8 through thetable
hole, and hook the chain to the left
pedal.
-3-
Connect hook Gi> for the otherchain 8
to clutch start lever G). run chain 0
through the table hole and hook it to
the right pedal.
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~
,...
C)
~i~~
t,+j
Motor center line
12) .Installation of the Accessories
1. Installation of the spool stand
Install spoolstand 0 at the right rearcorner of the table with
screws
0.
3. Installation of the bobbin winder
Ill MOTORS
Single -phase
IOOV, 4-pole, 250W motor
Three- phase
200V, 4-pole, 250W motor
In case
of using a commerical single-phase motor select a 4-
pole motor with a power rating
of 300W. or more.
In this case, install the motor as shown
at left.
The table center line
is the same as the machine center line.
2. Installation of the handle
Slide handle 8 onto handle shaft 8. and fasten handle8 to
handle lever 8 with nut
8.
4. Installation of the sub-tension
Install the bobbin winder onthe bed with screw 0. Bobbin winder pulley0 must be
in line with the flat belt. Loosen screw 0 and adjust bobbin winder link shaft 0 by
turning it so that, when bobbin winder link A0
is pressed, bobbinwinder pulley0
will lightly touch the flat belt.
Install the sub-tension
fB at machine
head
by screw $. Strength and
position
of the spring are already
adjusted, so be careful not to bend and
remove it.
-4-
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5. Installation of the crosswise ruler and longitudinal ruler
(I) Fasten crosswise ruler • to length feed plate 41 with bolts CD and washers 41.
(2) Fasten longitudinal ruler 8 to bed cover 41) with bolts. and washers fD.
* In case of sub-class -5, fix ruler directly on the bed.
6. Installation of the tape winder and tape guide (in case of sub-class -2 and -3)
When elastic materials such as knitted materials is used, a strong buttonhole can be made with a tape at the backside of the
material to
be sewn altogether.
·----
•
(I) Install tape winder fl on top cam cover I) with screws
(2) Fasten tape guide rear fa and tape guide front fD to
length feed plate
41 by screws •. e.
(4) Pass a tape through as per the picture at the above.
(3) Fasten tape guard front 8 in case of sub-class -2 and
fasten tape guard front fJ) in case
of sub-class -3 by
screws G).
7. Installation of the belt cover
Fasten belt cover G to the back of the bed with belt cover
hinge G and screws G).
-5-
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~B. OILING AND TRIAL OiPE.R~Aflt(Q)~-~
(]].Oiling
'-------·
(I) Remove belt and tilt the machine.
(2) Connect vinyl tubejoint (black) 0 with joint nut (black)
(4) Gently pour oil into oil tank 0 under the table through
filter 8 until the tank is filled up to upper reference line
f).
••
(3) Connect vinyl tubejoint (white) 8 with joint nut (white) If oil level falls below reference line 8 .
••
© Oiling
* Remove the face plate, side cover and belt cover, and oil all working parts.
* Pour a drop or two of oil to the arrow-indicated points daily. *Note: Use white spindle oil.
~. Oiling System Adjustment
8-~~=
======~~~=====
_/ ~Moreoil
Base Less oil
A few minutesafter the power is switched on, adjustoil flow regulator 8 on the right
of the base by turning it until oil level can be seen in gauge pipe 0.
• Oil level falls during sewing.
-6-
© Hook oil flow adjustment
Adjust oil flow to the hook by turning
oil regulator shaft 8 on the front of the
bed.
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~.Trial Operation
At stop
(I) Before s ta r ting the machine, be sure to co nfirm that
clut ch s topper f) is in stop c am assembly O.
(2) Switch the ma chine on.
(3 ) Th e ma chine will s tart when the rig ht pedal is stepped on.
~ C. CORR ECT OPERATION ~
!]]. Fitting Needle into Place
I
[21 . Upper Threading
I I
At s tart
(4) Release th e pedal once the ma ch ine s tart s runnin g. (If the
pedal is kept ste pp ed on, the m ac hine will n ot stop.)
(5)
After a fixed num ber of s titch es are made , the machine
sto ps.
(6)
When the left p edal is stepped on, the wo rk clamp rise s.
Repeat abov e s tep s (3), (4) and (5) a few tim es.
Use a
DP X 5 needle 0.
Lo ose n set sc rew f) . ho ld the needle with its groo ved si de
f ac ing in your dire ctio n. a nd insert the nee dle all the wa y into
th e needle hole.
< Co tton th r ead >
Spr ing
Thr ead ha n ger
P as s a thr ea d onl y th r ou g ~ thread ha n ger .
< Syn th etic fith er thread >
I I
'
'
*When thr e ading the nee dl e. pass from the
other side to this side
- 7 -
Pass a thr e ad through t hr ead hang er
and sprin g.
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~- Winding Lower Thread
Uneven with
more thread
wound on right
Uneven with
more thread
wound on left
© Threading bobbin case
(I) Check the power switch that it is on.
(2) Slide bobbin 0 onto bobbin winder spindle f).
(3) Pass the thread in the order of the numbers shown, and
wind a
few turns of the thread around bobbin 0 in the
arrow direction.
(4) Push bobbin winder link A 8 and release it. The thread
will wind on the bobbin.
(5) After the bobbin finishes winding the thread, bobbin
winder link A8 automatic return to its original position.
(6) Remove the bobbin 0 and cut the thread with the thread
cutter
8.
* Turn screw 0 to adjust the bobbin to the correct thread
winding volume.
• If the thread winds unevenly on the bobbin 0, loosen
screw G. and move bobbin winder tension guide
f) tothe
left
or right as necessary.
After winding the thread on the bobbin, pass the thread in the order shown below.
Insert the bobbin into the bobbin case. Pass the thread through a slit in the
bobbin case and under the tension
spring.
Pass the thread through another slit
and pull it out of the thread hole.
~. ~itting Bobbin Case into Place
Hold the bobbin case by latch 0. and insert it into the hook.
Let the thread end fall in front of the bobbin case.
-8-
~-
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~-Sewing
© How to use the emergency stop lever
-8
Push emergency stop lever 8 down and immediately release
it. The machine will stop.
© How to use the handle
I§). Thread Tension
(I) Make sure that the clutch stopper is in the stop cam, and
then switch the power on.
(2) Depress the left pedal to raise work clamp 0, placeyour
work under it, and release the left pedal.
(3) Depress the right pedal to start the machine.
When the machine starts running, release the rightpedal.
(4) The machine will sew a fixed number of stitchesandthen
stop.
(5) Depress the left pedal and take out the work.
© How to use the cutter locking device
Keep cutter lock lever 8 lightly depressed with your finger
until the machine stops. The cutter
will not drop.
Turn handle 8 after confirming that the needle is not in the
work.
* Thread tensions vary with sewing conditions. Refer to the following when selecting suitable tensions.
1. Lower thread tension
ttfoake Spring
0
Turn adjusting screw 0 to such an extent that you will feel a
little resistance when pullingthe thread out
ofthe bobbincase.
Standard tensions
~
Purl Whip
s
-2
About. 15 "' 20g
About. 30g
-3
About. 15 "' 20g
About. 30g
-5
About. 15 "' 20g
About. 30g
Brake spring in the bobbin case reduces bobbin racing.
-9-
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2. Upper thread tension
Purl stitch
Whip stitch
___ ~ (~}
--r--~
(B)
~--1--~
~---1~(~)
(A): Bar tacking
(B): Zigzag stitches
Upper tension regulator adjust-
ment
Turn tension regulator nut 8 to adjust
thread tension for
bar tacking (A).
Less tension
Lower tension regulator adjust-
ment
Turn tension regulator nut 0 to adjust
thread tension for zigzag stitches (B).
(Decrease tension for whip stitches;and
Increase tension for purl stitches.)
IZ]. Thread Take-up Spring Adjustment
(1) Thread take-up spring height
(2) Thread take-up spring tension
Less tension
About 20
"' 30g
Adjust the working scope of thread take-up spring 0 by
loosening set screw 0 and turning the upper thread tension
regulator .itself. (Standard range
is about 8 mm)
Adjust the thread take-up spring tension
by turning tension
stud
0. (Standar~ ten~ion is about 20 to 30g.)
IBI. Cleaning
Remove lint and dust from thread
passages. Remove lint and dust from around the
work clamp.
-10-
Remove the bobbin case, and remove
lint and dust from around the shuttle.
And wipe the bobbin to remove oil.
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( D. STANDARD ADJUSTMENTS ~
[]. Needl e and Hook Timing Adjustment
* The correct timing of the needle and the hook is n ecessary for the hook point to scoo p an upper thre ad loop as the n eedle ri ses
from the l owest position
* When adjusting the n eedle bar u pward s troke, needle bar height and th e clea ran ce between the needle and hook point make
s ure that th e needle is at the center of the n eed le hole plate.
1. Needle bar upwar d stroke
0
~
I c
I I
I I
I I
\.1
0
,,
e
Loosen screws 0 and turn shuttle 0 unti l h ook point f) meets the center line of the needle wh en n eed le 0 ri ses by 2.5 mm (for
Mo del 88 14 -2 · -5) or 3.5 mm (for Model 88 14- 3) from the lowest po sition. *N ever loosen sc r ews 0 in an y case .
2. Needl e bar height
----- 0
Loo se n screw 0 an d raise or l ower needle bar f) until th ere is a clearance of a bout 1.5 to 2 mm between the ho ok point and the
top end of the needle eye when hook point f) meet the center line of needle 0.
3. Clear a nc e between needle and hook point
Loosen screws 0 and move h ook 0 forward or back until ther e is a cle arance of about 0. 03 to 0.08 mm betwecnneed le 0 and
h ook point f).
4. Clear ance between bobbin case holder and bobbin case holder bracket
Ab out 1.0 -l.Sm m
Loosen sc r ews f0 and adj ust the clear ance between bobbin
case hold er 0 an d bobbin ca se h older bracke t e to abou t 1.0
to 1.5 mm .
Mak e s ur e th at h ook 4D will not touch bobbin case ho lder
bracke t e wh en it rotat es.
- 11 -
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12). Presser Spring Pressure Adjustment
1. Presser spring adjustment
About 77 mm
Compress presser spring 8. adjust the distance between the
bottom
of washer 0 and the top of presser barguide bracket
8 to about 77 mm with presser bar guide bracketset screw 0,
and retighten screw 0.
131. Cutter Installation and Adjustment
About 0.2 mm -~n--
(I) Temporarily fasten cutter 0 to cutter holder 8 with
screw
8.
(2) Turn the machine pulley by hand until the needle bar is
nearly at the lowest position.
(3) Loosen screw 0. and move cutter holder8 forward or
back until the clearance between cutter0 and the needle
bar
is approximately 0.2 mm.
(6) Keep cutter lock arm 8 pulled with one hand, and turn
the machine pulley with the other hand until cutter 0
falls to the lowest position.
2. Work clamp tilt adjustment
___ )
---cl--
Fabric fParallel
Top
of needle plate
Loosen screw 8 ,and turn work clamp support spring shaft
8 until the bottom ofwork clamp 8 is parallel to the top of
the work.
(4) Turn the machine pulley by hand until the needle bar
comes up to nearly the highest position.
(5) Turn the handle until stop cam piece 8 8 rides on the
center of stop cam piece
8.
About 2 mm
.,.--.--0
~--·
Top of
needle plate
(7) Loosen screw 8 and make an adjustment so that the
blade edge
will enterabout 2mm deep from the top of the
needle plate.
(8) Turn the machine pulley by hand until the clutch
automatically engages.
-12-
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© Feed adjustment
Loosen adjusting nut G and move pointer 0 to the line
directly under the same number as the cutter number A.
B
Loosenadjusting nut G) and move token CD to thelinedirectly
under the same number as the cutter number
B.
~- Changing Number of Stitches per Buttonhole
The number of stiches varies with buttonhole size. Select a suitable number.
Any of the numbers
of stitches shown in the below table (gear case cover) can be selected by change gear combinations.
1. Change gear replacement
(Example: Selecting 119 stitches)
L STITCH R L STITCH R
54
360
22 38
147
38
52 319 24 36 133
40
51 300 25
34 119 42
50
283 26
32
107
44
48
252 28 30 96 46
46
226 30
28
86 48
44 203
32
26 77
50
42 182 34
24 68 52
40 164 36
22 60 54
(I) See the above table for 119 stitches, and look at the Land R columns.
(2) Loosen thumb screw 0 and raise gear case cover 8.
(3) Fit change gear 34 onto shaft L.
(4) Fit change gear 42 onto shaft R in such away that it will engage the other gear.
(5) After replacing the gears, be sure to close gear case cover 8.
2. Stop cam replacement (in case of sub-class -2 and -3)
Stop cam segment AL
Stop cam segment AS
(1) Remove the cam cover.
(2) Turn the handle until stopcam piece 8 comes to a point
where it can
be easily taken off.
(3) Loosen screws 8 and replace stop cam piece 8.
If the number of stitches is 96 or less, use stopcam piece AL.
If it is 107 stitches or more, use stop cam piece AS.
-13-
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~. Buttonhole Stitch Width and Reference Position Adjustment
1. Buttonhole stitch width adjustment
Backward
1
WI
W2
Reference line A Reference line B
The machine swings the needle to the left from the right
reference position in sewing forward
and back. Adjust after raising the small cover
0.
Turning WI adjusting screw f) or W2 adjusting screw 8
clockwise increases the needle swing motion and turning it
counter-clockwise decrease it.
2. Reference position adjustment
e-- ......
Reference line A adjustment
Adjust reference line A by loosening nut 0 with a box wrench and turning screw 0.
Reference line B adjustment
Adjust reference line 8 by loosening nut G with box wrench and turning screw 8 in a similar way.
© Follow the under mentioned procedure when changing the stitch width and stitch reference pasition.
Left zigzag
stitches
t !
Forward Backward
Wl Wl
Reference line A
( 1) Adjust reference line A so that the
stitches will not be cut by a falling
cutter.
(2) Adjust zigzag stitch width WI with
adjusting screw
f).
Right zigzag
stitches
Reference line B
(3) Adjust reference line B so that the
right zigzag stitches will not be cut
by a falling cutter.
Bar tacking
W2
(4) Adjust bar tacking width W2 with
adjusting screw
8. Bar tacking
width varies with manual turning
and high-speed operation due to
different thread tensions. Adjust it
by actually sewing.
* The needle swing width is adjustable in excess of the work clamp width. If bar tacking width is adjusted to more than 4mm,
or ifa reference line is moved, turn the machine pulley by hand and make sure that the needle will not touch the work clamp in
sewing forward
or back.
After turning the machine pulley by hand, be sure
to use the emergency stop lever to insert the clutch stopper into the stop
cam. Then you may start the machine.
-14-
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1§1. Cutter locking Device Adjustment
-
About 7--10 mm
Loosen screw 8 and adjust the clearance between cutter lock arm 0 and cutter lock lever 8 to about 7 to 10 mm when that
part
of the upeer thread which is at the tip of thread break sensor 8 is taut. Also, loosen screw 0 and adjust the clearance
between cutter lock
arm 0 and cutter lock lever 8 to about 0.5 mm when cutter lever 8 shifts onto cutter clutch bar 8 .
. ~ !ZI. Upper Thread Scissors Adjustment
Thin reference line
(I) Loosen screw 0, and align upperthread cutterlevel S8
with one of the reference lines of upperthread cutterlevel
L8.
Sub-class Thickness
of cloth Reference line
-2
Less than 3 mm Thin reference line
3 mm to 4 mm Thick reference line
-3
Less than 3 mm
Thin reference line
3 mm to 3.5 mm Thick reference line
-5
Less than 3 mm Thin reference line
3 mm to 5 mm Thick reference line
Loosen screw 8 and install scissors D 8
as close to the work
clamp as possible. (If the scissors
are positioned too high, the
thread end remains
on the work after the thread is cut.)
* If the thread end is not sewn into stitches, it is because the
scissors open either
too soon or too late. Loosen screw 8
and move scissors guide 0 forward to open the scissors
sooner,
or backward to open the scissors later.
* In case of sub-class -5, no return spring 0 is available.
IBJ. Upper and Lower Tension Regulator Thread Release Adjustment
1. Upper tension regulator adjustment
At high speed
At low speed
At stop
Upper tension discs 0 tighten at high speed sewing, and rise as the machine stops.
Loosen screws 8 and move upper tension releaser 8 up
or down, to the right or left to adjust the discs.
-15-
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2. Lower tension regulator adjustment
11:
iiL---~-------~
b·:.-:::-~:::::::::
Loosen screws 8 at. the machine stop position, and make an adjustment so thread release lever 8 will be on top of thread
release cam piece
0.
' Loosen screw 0 and move thread release bar 0 to the right or left so that discs 8 will rise about 0.5 mm at this time.
191. Clutch Brake Adjustment
Unless the clutch brake is properly adjusted, the machine will stop half way or fail to start;andextra power may be required for
operation, and machine durability may be adversely affected
1. Clutch return spring tension
Loosen screw 8 and move spring
adjuster 8
to adjust clutch return
spring 0 to as weak a tension as
possible which, however, is sufficient to
stop the clutch stopper positively.
4. Clutch pawl A and B adjustments
Clutch pawl A adjustment
2. Clutch start lever clearance
Loosen nut 0 and turn bolt 8 to
adjust the clearance between clutch
lever pin 8 and bolt 0 to about 0.5 to
1.0 mm at the machine stop position.
3. Stop spring A tension
•
f3
·----~:::---
Turn nuts f) and8 until the lowerend
of stop spring shaft 0
is about 4.5 to 5
mm out of the bottom of nut 0.
Loosen bolt CD and move clutch pawl A 49 to the right or left so thatthe shortestdistance between stopcam CD andclutch
stopper
G) will be about 3 mm when the tip stop cam segment 8 CD comes to part® of stop cam segment A G!).
Clutch pawl B adjustment
Loosen bolt 8 and move clutch pawl 8 CD up or down so that clutch paw 8 CD will engage clutch pawl A 49 about I to 1.5
mm deep when the tip of stop cam segment 8 CD comes to part® of stop cam segment A 41).
-16-
From the library of: Superior Sewing Machine & Supply LLC

-
~ TROUBLESHOOTING ~
.__ __ T_ ro _u_h_le __ ___.ll ._ _ __ c_ au _s_e_ _ _ ___JI I .__ __ c_h_e_c_k_P_o_ in _t_ ____JII._ ___ R_e_m_e_d_v __ __J_I P_ a_g __Ji
-Needle bent or blunt.
~
Needle.
1--
Replace needle. 7
Needle installed Needle direction.
In sta ll needle in the 7
-imprope
rl y.
~
1--- right direction.
Upper
thr ead brea ks . Wrong threading. Threading. Refer
to instruction 7---1---
fo r upper th_rea ding.
Upper thread tensi on
Upper and lower Adjust to correct
10
-too strong. -tens1on regulat
or
-tension.
tensions.
Needle and shuttle Refer to instructions
-timing wrong. -Needle and shuttle. -for needle
an d s hut tle
II
timing.
Lower thread tension Tension
of lower Adjust lower thread
r- 1--
thread tension adjusting
r-
9 .
too strong. screw. tension correctly.
Lower thread breaks.
1--
Oil and lint around Remove lint and wipe
'-
bobbin case.
1-- Bobbin case. r-
off oil.
10
Thread end remains· Upper
th read scissors Refer to instructions
I-- r-
Height of sc issors D. t--- fo_r upper ~hread
15
at start of sewing. too high. S
CISSO rS a djU St ment.
r-
Needle bent or blunt.
r- Needle -Replace needle. 7
Needle insta ll ed Needle direction, Put needle in the
Stitches skip. -
r-
improperly.
r-
heig ht.
-correct direction a nd
7
height
'----
Wr ong upper threading.
1--
Upper threading.
r-
Pas s upper thread 7
correctly.
Lo
we r thre ad tension Lower thread te
nsi on. -Adjust lower 9
r-
too strong.
t---
thread tensi on.
Thread loose. - r-
Bar tack stitc he s loose. -Upper tension dis
cs
-
te ns ion.
Ad just upper
10
tension regulator.
L-
Zi gzag stitc he s loose.
t-
Lower tension di scs
t---
Adjust lower 9
tension. tension regulator.
Nee dl e install ed
Needle direction Put nee
dl e in the
r-
improperly. 1--- height. -correct direction and 7
height.
Needle break
s.
Ne edle an d shuttle 1---
Nee dle a nd shuttle.
r-
Adjust timing of
II
1-- 1--- timing wrong. needle and rotary hook.
'--
Stitch width wrong.
t---
Nee dl e swin g.
-
Adj ust stitch width
an stitch refereu
ce
position. 14
-17 -
/
From the library of: Superior Sewing Machine & Supply LLC

__,.....
118-814-2,-3,-5
192814-3-02
Printed in Japan
From the library of: Superior Sewing Machine & Supply LLC