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 ........................................ ...... ..... ..... ...........

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 &...

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,...

(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...

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....

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) 
•...

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...

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...

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...