Brother Lh4-b814-2 Instruction Manual

							INSTRUCTION MANUAL 
FOR 
BROTHER MODEL LH4-B814-1 ,-2,-3 
High Speed Buttonhole Sewing Machine 
BROTHER INDUSTRIES, LTD. 
NAGOYA, JAPAN. 
From  the library  of: Superior  Sewing Machine  & Supply  LLC  
						

							1 . Features and S pecif icatin o s .................... ...... ..................................................................... 1 
1. Main Speci f ications .................................................................... ................................. .. 1 
2. S titch formation .. ...... .......................... ... .... ........................... ..... ................................... 1 
3. Features ........................................ ...... ..... ..... ........ ................................................ .......  . 
2 . 
Setting up and running ................................................................... ............................. ..... ) 
1. How to fix t h e motor ................................... ........ .............................................. .. ... ..... 2 
2. Setting the machine head on table top .. .. .... ... ....... ................ ....................................... 2 
3.  How to us e  the machine ................................................................. ........................... ...... 4 
1. C leanin g up ................ .......................... .... ..... .......................... ..................... ..... ... ..... .... ·I 
2 . Needl e and its setting .. ..... ............................................. .... ... ......... ................. ..... ......... 4 
3. Selectio n of thread  threadin g ... .... ...................... .................................... ....................... 4 
4. Winding lower thread ............................................................ ........ .... .... ............ ..... ......  5 
5. Threading bobbi n case ..................................................................................................  5 
6. Regu lating lower thread te n sion ............................................................................. .... ..  6 
7. Inserting bobbin case i nto hook ... ... ..... .... .................................................... .... ............. 6 
8 .  R un n i
ng .................... .................... ..... ......... .... ... .......... ........ ...... ...... ........ ......................  6 
9 . 
Operating knife lockin g  device ............................................. ........ .... ..... ... ..... ....... ........ 6 
1 0. Emergency stop  .. ..... ............................ ... .................................................. ........... ... ....... 7 
I I. 
Operating manual fe ed ing le v e r .................................................................................... 7 
4 . Adjustment. ................... .... ..........................................................................\
....................... 7 
1. Regulating upper thread tensio n ........................................................................... .... .... 7 
2 .  R
egulating the thread take -up spring ... ..... ........... ... ...... .... ............................ .. .... ..... ....  8 
3. Timing the  hoo k and  need le  .... .......... ..... .............................. ............................. ._ ..........  8 
4.  Adju s
ting th e  width  of buttonhole  and position of buttonhole ................................. : ....  8 
5. Buttonhole  slot and length .......... .. ............................. .... ........ ................................... ....  9 
6. Nun1be r of  stitches ......... .............................................................................................. 10 
7. Setting positi on  of cutter ...................... .. ...................................................................... 1 0 
8. A dj ustin g upper  th read  trimmer ...... ....... ... ... .... ............... ............... ........................ ... .... 11 
9. Replaci ng  lower thread tri m mer ... .... .. ............ ........ ... .... ........ .......... ............. ..... ... ........  12 
1 0. A dju stin g automatic  thread breakage perceiving device  ........ ....................................... 12 
l 1. R eleasing  te nsio n on main te ns io n  regulator .................................................... ...... .... ... 12 
12.  Releasing te n sio n  on lower tension  regulator .................................... ....................... .....  13 
1 3. 
Adjus ting oiling  ..................................... ........................................................................  l3 
14. The cutter fa lls  on the scissors  ................... ...... ... ....... ..... ............................... ... ..... ..... l-1 
1 5 . In stallin g the tape win der ............... ....................................... .... ................. ............... ... l-1 
5. Trouble  s ho otin g  .... ......................................................................... .................................. 15 
1. l h read breaks  ...... ... .............................................................. ........................... .... ...... .. 15 
2. Stitch skipping ................................. ... .... ...................................................................... IS 
3. Irregular stitches ............................................... ......................... .... ............................... 15 
4. Threading of. ................................ ......... .... ...... .......................... ................................... IS 
5. Ir regu la r  stitch at begin ning .. ............................ .......................................................... . IS 
6. P arts list ..................................................................................... ..... .................................. I() 
From  the library  of: Superior  Sewing Machine  & Supply  LLC  
						

							1.  FEATURES  AND SPECIFICATIONS 
1.  M ain Spec ification s 
\lode I 
S ub
-class - 1 
Ll 1-1 - BSl-1 s ingl e needle lock  stitch buttonholer 
-2 -3 
Use general materia ls general mater ia ls knitted materals 
3 .300 spm Max. sewing speed 
Length of buttonhole 
\\idth of  button hole 
6.-lmm -25mm( 1
•1  - 1 )  6.-lmm -32mm (J,{ - I),{ ) 6.-lmm-32mm( ,l.{ -11
•1 
) 
2m m --lm m(%;-\/)  2mm-6m m( %;-1~;n 2mm -6mm(%;-).;;) 
Tape wind ing dc,·ice 
Feeding mechanism 
t\il Equipped Equipped 
uppe r upper & lo,,·er uppe r & IO\\·er 
Buttonhole stitc hes 60-%0 stitc hes 
I I e ight of presser  foot l2 .5mm (Yzl 
2. Stitch  formation 
I) \\hip stitch ..... same stitch formation as ordinar~· l ock stitch zigzag formation. name ly. zigza,g s titch 
of uppe r thread o n lop and zigzag stitch of lower th read on bottom. 
2) P url s tit ch ..... Strong  te nsio n  on upper thread applied. thu s. the upper thread seem s to be straight 
raised up o n the lo·e r thread.  Thi s is applie d  for buttonhole \\·o rk s o n shirts . pyajamas and the like. 
This mode l L! 14-88 14 can be done either whip stitch or p u rl  sti tch. depending on, the sewing materi­
a ls. and it is general!~· used ,,·ith purl s titc h buttonho le on shirts. pyajamas and the  lik e. and used 
with ,,-hip stitch buttonhole on knitted fabrics. 
With this machine.  if  i t  is used with purl stitch. both ends of buttonhole. portion of bar tacking can 
be  clon e with ,,·hip stitc h  in order to be abl e  to get the beautiful and s table quality o f butto nholes. 
As m entioned abO\· e. on the knitted fabrics and je rseys.  it  is  recommend e d to do wi th whip s ti tch. 
It  is 
ver~· easy to change th e  stit ch  formation fro m  p url  stitch to whip stitch onl~· by changing the 
t e n sio n on the upper thread tensio n regulator. 
3.  Feature s 
1) Thi s model  is ,-cry fa st  to se,,· and can be obtained good qual it~-bu ttonholes w ith easy adjustm ents. 
2 ) 
Automatic lubrication  can a,·oid th e  oili ng to the machines in e \·ery  mornin g. 
:1) It can raise up the producti,·ity a s  it ensures less thread breaks and thread  off. 
-1) 
ide working space can ensure e asy  sewing opera lion. 
;)) A specially se lected belt makes no  fine adjustment of belt te nsion. 
61 .-
 automatic knife locking de,·ice enables to pre,·ent the mater ial s  from damage in c ase of the 
thread b reakage. 
7) Specially designed  speed reduction mechanis m enables no iseless 
and le ss  ,-ibrat ion ,,·ork s. 
Hl It is ,·c ry easy to change t h e  le n g th . wi dth of  buttonho le s. n umber 
of stitches and amount of oil. 
9) Emerge ncy in stant  stop lever can guaran tee th e lo ng durab ilit y of 
this machin e and also can protect  the breakage of important parts . 
!OJ B obbi n \\indi ng can be clon e eYen if machine  stops. 
II) The applicable thickness of th e materials  is ensureclupt o4. 5- Smm. 
1
21 This mac hin e is eq uipped \\ ilh adjustable  rulers either to the 
direction o f back a nd  forth or left and rig ht. 
- 1 -
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							2. SETTING UP AND RUNNING 
1. How to fix the motor 
(Fig.  1) 
1357 
~0 
oW I 
(Fig. 2) 
As shown in Fig.  1, it is the  measure· 
m enl of the location of constant run ­
ning ind uction motor, made by Brother. 
( 4  pole. 
1.440 /1,720 rpm , 25 0W). If you 
purc hased  thi s machine as  head  only . 
plea
se use w ith  the  con stant  running 
ind uc ti on 
motor of  4  pole. 250W or 
more wattage a nd  in this  case,  th e 
m
otor mo unt ing  bracket  is differe nt 
from  o
ur Brother motor, thus, please 
follow th e instructio n  below: 
(Fig. 3 ) 
Firstl y,  pu t  the  two  sp eed p ulley  wh ic h  is suppli ed with the  machine  hea d  to  th e  motor  shaft and se l 
th e  po siti on 
apart  357mm fr om  th e  ce n tr e of th e machine. Set the po sition apart 107 .5 mm  from the 
edge of  the table top to  the  end  of  pu lley  as shown in F ig  2.  Drill the hol es at th e correct  positio n. 
S e
condly , put th e  motor to table top. Al that t im e,  please make sure to insert th e washers between 
t abl e top  and  m
otor mounting bracket  and fasten  secure ly  w it h set bol ts . 
The correct motor rotation  is  c ounter clockwis e \·ie we d fr o m  th e  pulley  side  and  if  not.  ple a se gel 
the corre c t rota ti on. 
2. Setting the machine  head  on table top 
I) S et th e base . 
(Fig.  4) 
Put th e base  on  th e table  lo p  as  pe r  Fig.  4 and put  tw o 
b
elts  as  s hown in Fig .  3.  In  the  district o f 50 Hz, use 
with 4 2 for larger diamete r  pulle y and 43  fo r smaller 
diameter  pulley .  In  th e  district of 60 Hz, use with  b oth 
-ll s. 
A t  th e 
prop e r tensio n  of t\\ O be ll s, fasten  th e  ba se  w ith 
woo d 
screws to table lop  securely . 
Un l
ess you may put th e  position correctly ,  it causes lo 
lessen the  lif e  o f belt s. 
2) 
Put t h e  hin ges in the bed  and  place th e  machin e  head on the  base. 
3 ) 
Put th e  ten sio n  pulley as  shown  in  Fig. 5. 
4) Put th e  head res t. 
5 )  A s  s
hown in  Fig.  6, connect the  oil  tu bes w ith tube joi nt. 
The n ,  pu t  t he flat belt  betw ee n  base  pulley and te n sio n  pull ey  as  s how n  in  Fig . 5. 
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							(Fig . 5) (Fig.  6)  (
F ig.  7j 
6) Put the bobbin  winder assembly as per Fig. 7. At that time,  please make sure to  be right angl e 
b
etween  belt and pulle y. This  is because yo u can get the even  bobbin  winding when  you may wind 
t h e  bobbin 
threads on bobbin ac tually. The  fine adjustment can  be clone  at  the  positi on  of  thread 
guide. 
7) Put the bel t  cove r with flat he ad  scre w s. 
8) Put the flat belt to  the machine pulley and push  the  tension  lever and re lease it at the position  in 
lin e 
·ith indicator. 
(Fig. 
8) (Fig.  9) 
9 )  All 
the above procedures are compl eted . th en pour oil int o  th e  oil  rese rvoi r and  oil to the  s lidin g 
parts taking off  the  face plate,  side cover and b elt cover. Please also make  sure to \\ ·ip c out all 
the dusts  of packing in transit ,  if any. (F igs 8. 9) 
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From  the library  of: Superior  Sewing Machine  & Supply  LLC  
						

							Lower line 
I I 
(Fig. 1 0) 
(Fig. 11 ) 
10) Oilin){ into  oil reservoi r. 
Thi s 
model is constructed that oil reser vot r is  a part o f  bed 
p l
ate which is  seen underneath the  table top. Oili ng  is made 
as per F ig. 6 and  pour oil o n to  the  oil filter. 
Pour oil  until  the upper line  of  oil gauge windO\\ . 
Ch
eck in  the  oil gauge \\indo\\  before starting jobs \\hethcr 
proper oil is contained or not and in case that oil may s h o \\ 
und er  th e  lower  line, 
fulfil oil properly. 
II) Checking the lubricating system. 
Turn the oil flo\\ regulating \ah·e on the  right sid e of the 
bed  \\ith  a 
screwdri\·er so that when  th e motor is S \\itched 
o n oil may be visible  in  the  pip e  in the oil gauge window in 
t h e  l
op CO\·er. (Fig. 11) 
3. HOW  TO USE THE MACHINE 
1. Cleaning up 
It  is absolutely  necessary to maintain the hook  and race cleaning  up  in order lo get the beautiful 
buttonhole stitches. Please remove all the dus ts  and lints to get th e constant beautiful stitches. 
I) Remov e all the  dusts or lints which  will  be accu mu lated between  needle plate  and hook al least 
o nce a day  after  jo b  fini sh. 
2 )  Remov e all  the  du
sts or lint s \\hi ch  will  be accumulated on the presser fool and thread trimming 
mechani sm  whenever  you may recognize the necessity. 
2. Needle and its setting 
i\lo de l LH  4 -B  814  is  used  with DP X 5 needle. 
Use  the n
eedle as t h in as poss ible. It must be matching t h e  th ickness of  thread and ne ed le eye so 
that t h e thread may pass through  the  need le eye smoothly. 
I n  general.  fo r  purl  stitch. the recommended  needl e size  is  upto ::II. \\·herea s for whip  stit ch. upto 
;:9. 
To set th e  need le  to  the  needle bar, please re fe r to Fi g. 12 . S ho rt groove in  front of you  and  faste n the 
ne ed le set screw confirmin g that the  need le comes all th e way upto  th e  need le bar hole. 
*The r ecomme nded ang le of the need le s  is  a bit left direc tion  against  the  centre of needle bar. Al 
thi s  se tting  position,  it is  effec tive to eliminate skip stitc hes. 
3. Selection of thread and threading 
F or  good quality buttonholes.  use for uppe r thread with onl y high grade threads. preferably cotton 
threads  in sixe of ~40-#60, 4-6  ply thread, le ft  hand tw is ted,  unifo rm  in diameter without  k not or slub s. 
This  mode l  LH  4 -B 814 can be  sewn wit h  th e syntheti c  threads  as  well as cotton  threads. 
Right hand twis te d  thread or poor quality threads cause thread breakage w hich drop the productivity. 
T he
refore, please make sure  to  us e  high  grade threads  lo  use  with  this machin e. 
Use  for l
ower thread with  high  grade thread s  as well in  size of # 50-# 100. 
- 4 -
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							To thread the upper thread. please follow the following  steps. 
1) Thread retainer 
2) l.;pper tension regulator discs 
:~) Thread guide 
·l l t.;ppe r thread guide 
5) Thread retainer 
6J Lower tension regulator disc~ 
7) Thread ta ke·up spring 
H) Thread guide 
9) Thread breakage percetnng wire 
I 0) Arm thread guide 
II) Thread take· up le,·er 
12) Ann thread guide 
I:~) 1
m thread guide 
II) :\eedle bar thread guide 
L)) l\ceclle (!lease pass the thread to needle c~·e from 
behind the  nccclle) 
• 
Threads  and gimp passes (please refer to Fig. 1:!). 
4 . Winding lowe r thread 
5 . 
Threading bobbin case 
-- -> t... .• -~ (F ig. 12) 
For lower thread. it is  recommend ed to use  with ±::50·::: I 00 
cotton thread. but it can be assured to get sewing perform· 
ance with synthetic threads as well. 
To wind  the thread in bobbin , please refer to Fig. 13. vVind 
4-5 times around the empty bobbin counter clockwise. and 
push  th e  lever to start to  wind. Wh en sufficient amount 
of threads  will be wound. the bobbin winder will stop auto­
matically. The amoun t  o f threads to  be  wound  is adjusted 
by  t he  screw. 
To thread on th e  bobbin  case. please refer to Fig. 14. a. b. c & d. 
( Fig . 
14 a) (Fig . 14b) (F ig . 14C) (Fig. 14d) 
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							6. Regulati ng lower thread tension 
(Fig. 15) 
(Fig. 16) 
It can be  regulated the lower thread tension by adjusting the 
sc rew A. 
In case that ~·ou may tighte n the scre w A.  th e  te n sio n will be 
stronge r. and ,·ice ,·ersa. The correct te ns io n of lo wer thread is 
that when  you pick the thread encl. th e bobbi n will slowly go 
down by its own ,,·eight as pe r Figs 15. 16. 
!lease be careful not to ha,·e stronger tension in  order to a\·oicl 
thread breakage. 
7 . Inserting bobbin case  into hook 
8.  Running 
Please refer to Fig. I/ to inser t  the bobbin case into hook. At 
that time.  please make  sure to pull  the thread end toward you 
in order to a  void thread jamming. 
Wh en you  will slarl the ma.chin e. please make sure to  be  normal stop  positio n,  t hat is ,  the stopper is 
e n
gaged in the stopper cam. Unless you may be acquainted with this  machine.  please refrain the 
machine from starting by the motor. Fi g 19. 
The best way to comprehend the  machine mechanism thoroughly, please  start the machine by hand 
d ri vi ng the pulley  slow ly to observe the respective  move ment s. At first.  remove thread,  need le,  bobbin 
case and culler then start  t o run. 
\\ith left  treadl e  pedal. you can lift the presser foot and with righ t treadle pedal. you can start the 
machine. 
This mac h ine is  des ig ned with safely devi ce, ,,·hich prevents  the machine from startin g  whi le the 
presser foot  i s lift ed and prevents the presser foot  from  lifting  up while machine  runs. There fo re.  if 
you depresseright treadle pedal  on  the half way of  left pedal engagement. the machine will not start 
to  run , and left treadle ped al will not engage in lifting presser foot  while  machin e is  runn ing. 
(NO
TE) Please be car e fu l that when  machine is going to slop if you w ill depress left treadle  pedal. 
the 
machine  will not slop. 
9. Operating cutter locking device 
(I ) On upp er thread breaking  } 
(2) 0 I h 
d · h  d  b  k. you can ha\·e machine restart without culling · n o w er t rea runnmg out o r t rea rea ·m g 
0\I::Wie 
(Fig. 18)  t
h e  butto nh ole 
wi th cutter. 
W ith this  mod el, Ll-1 4 -B 814 in case of (1) t h e cutter moveme nt 
will  be  l
ocked automatically and in case of (2) . as th e  cutter 
will 
be engaged  in, please depress th e cutter slop lever un til 
the 
machine  s lo ps automatically. vVith this  s te p,  it  ensu res to 
p rev e
nt the materials  fr o m damage  and  yo u can  have machine 
r
estart.  Fig 18. 
- 6  -
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							1 0. Emergency  stop 
(Fig. 19) 
It is essential  to  slop the mac hin e instantaneously e\·en if 
the  machin e run s wh en  the  needl e breaks or thread jam ming in 
lhc  hook. This preve nts the  ma chine  and materials  fr om 
d
amage. 
In t h is  case,  de pr ess dmm the emergenc y slop lever by hand 
a nd  re l
ease il.  (This operation  of th e  emergency stop leve r 
m
ean s  that machine speed w ill be  redu ced  t o 80 0 rpm  by press­
ing  th e  leve r and \\ill be  reduced  to  zero by releasi ng the 
lever.) 
11. Operating manual feeding handle 
\\h en you will use  the  emergency stop  lever or  whe n the  thread breakage causes during  its ope rati on, 
yo u would lik e to restart the  machin e ju st  before  th e  defec tive stitch. At that time.  turn  the feed  cam 
clo ckwi se  by  means of th is manual  feeding  handl e al your des ir e d  positio n. Fig  19. 
(l\OTE) 1. At the repairing of  th is  machin e.  on  th e  co ndi tion that the  s top cam may b e  off  fr o m 
s
topper whic h is  on the co ndi tio n  of  depress i.ng  the  right treadle  pedal. after  turni ng  the 
pu
lley by  hand.  there causes so meti mes th e cutter  be ing  operated to drop at the machin e 
s
tarting  to  run. This can be avoi ded  by starting the  machin e from  norma l stop  positi on 
o r 
depress ing  the  cutter stop lever as sh own in F ig.  18. 
2. The manual  fee ding handl e sh ould be used  when  the need le  is apart f r om the materia ls. It 
i s 
saf e  to operate the  manual  feedin g handle at that positio n that stop cam stops at the 
c
orrect angl e . 
4.  ADJUSTMENT 
1.  Regulating upper thread tension 
This mod el LH 4-B814 has t\\O upp er thread ten sion  regu lators. As  shown  in Fig. 12.  th e  upper tension 
regu l
ator play s a  ro le of regulating the  uppe r thread tension  on th e bar tacking  on both ends of button­
ho les and the lower ten sion  regula tor on  the parallel  zigzag tension. 
a)  In 
cas e  of  purl stitch 
1) Regulating  the upper  te n sion  regul ato r, please obtai n the te n sion  so as to be whi p  sti tch  on the 
part of bar tacking. 
2) Regulating the  lower te nsion  regu la to r, please obtain t h e  te nsio n so as to be stra ig ht  raised stitch 
on  the part  of  z igzag in  parallel. 
The stronger the tension , th e more beau tif ul  th e  seams.  However, there exists th e limit and  if it 
w ill 
exceed th e  limit , it causes the  upper  thread breakage,  s o  please be careful to obtain th e 
proper 
tens io n. 
b )  In 
case of  whip  stitch 
1) Tighten the tension  of bobbin case and  obtain the stronger tension  in comparison with the ten sion 
f o r  purl  s
titch. 
2) L oose n the te nsio n on  lower te n sio n  r egu lator properly. 
(NOTE) On whip stitch,  same threads  o n uppe r and lower are reco mmendabl e. 
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							2.  Regulating the thread take -up spring 
I Thi~ model Ll l-I·BH14 feature~ that the thread take-up spring 
-f';l(g~"the height of thread 
, ..... .----take ·up spr in g 
Lower the h thread take -up 
(Fig . 21) 
p~ay~ two ro les. one  fo r regulating the tension  and the other 
fo r percei,·ing  the upper thread breakage as  well. Therefore. 
the amount of movement of take-up  spring is  recommendable 
in th e range of;) 7mm for cotton thread and 2-3mm fo r 
synthetic thread.  !lease refer to Fig . 20. 
(Fig. 22) 
*\\hen the height of thread take-up  spring 
is i ncorrect pos ition. loosen  the screw and 
turn the upper te nsion  regulator assembl~·. 
*The thread take-up spring must b e adjustld 
to correct ten sion as \\·eak a s poss ibl e. 
* To 
change the tension. turn the stud screw. 
Fig n 
3 . Timing the hook and  needle 
1  
L-
25-
\,,; I 
--- 
1.8
-
(Fig. 23)  (Fig . 24) 
To make adjustment of tJmm.~~; the hook and needle. plea~c make sun : to be at th e posit ion o f the 
needle coming down to the centre of need lc plate. 
\\hen th e needle comes up 2.5mm from it s lowest position.  it i~ correct timing that the point of hook 
is located at behind  th e centre  of  needl e. !	 that time. the correct h e ight of needle bar is determine d 
at the 1.:1- l.Srnm between the poin t of hook and the top of needle  eye.  Fig.  23. 
(Fig.  25 )  (I) 
To 
make adju stment of timi ng  the hook. loosen the ;:Lt 
~crew as  per  Fig. 24. 
(2) T o make  adj ustm en t  of needle bar  he ig ht. loo~en the  needle 
bar clamp scre w . Fig. 2:1. 
4. Adjusting the width of buttonhole a nd  position of buttonhole 
backward 
! 
A line B line 
( F ig . 26) (Fig. 27) 
8 
(Fig. 28) 
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