Brother Lh4-b814-2 Instruction Manual

(! l :\cecile S\\·tng mg. 
This machine swings the needle from right to left eithe r going forward o r backward. for tacking 
o n  b oth ends. Fig. 26. 

6.  Number of stitches. 
) . ~  ~s, t ... ¥ -+- -+-t---+--+-11-JB I .. . . .. 
( Fig . 31) 
Please use with this machine  in proper numbe rs  of  stitches pe r 
cycle depending  on  the length  of buttonhole. 
You  c
an obtain  the  predetermined number of  stitches chan g ing 
the combin ati on of the gears  includ ing  wit h  this machine.  (Fi g. 
31) 
( I) Changing  the  number of stitche s 
(Fig. 32) (Fig . 33) 
llere is an example to obtain th e desi re d numbe r  of stitches pe r cycle. 
To obtain...

8. Adjusting upper thread trimmer 
T he upper thread trimmer plays the follo\\·ing three roles. 
a .  Trim the upper thread 
b. I lolc l the th read e nd after trimming 
c. Se\\·in.~ on the thread end at th e beginn in g of next buttonh ole . 
( F ig. 
3 5) 
I) a. If the trimming mechanism \\·o rk s  pro perly \\ ithout good 
trimming re sult.  it  is con side red a s  th e  defect of back and 
fo rth  position of th e trimme r.  At that tim e.  loosen the 
s e re \\  and 
adjust the correct posit ion....

9. Replacing lower thread trimmer 
{Fig. 38) 
Ir you  ,,·ill find that t h e IO\\·e r thread trimmer kni,·e s arc 
dull. unscrew th e stud scre w  and  needle  plate screws a s 
shown  in Fig. 3R. th en  re m ove  th e  needle  plate assem blr 
and replace t h e defecti\·e parts  th e reof. 
10. Adjusting automatic thread breakage perceiving device 
{Fig . 39) 
{Fig . 40) {Fig. 41) 
If the re latiYe positi on  between cutter preventor and thread b reakage percei,· ing  ,,·ire  will be ou t  of 
o rd er....

12. Releasing tension on low er tension regulator 
(Fig . 43) 
Adjusting screw 
~?J 
-(Fig . 44) 
13. Adjusting oiling 
(Fig. 45) 
The thread on lower tens ion regulator  can be re leased by the 
ca m  of  te nsio n  re l
easer. This adjustment  is  obtained by  loosen ing 
t h e 
adjust ing screw as s h own  in Fig. 44 and moving  tension 
rel
ease p in  to  the direct io n  indicated arrow sh o wn in  F ig. 43 
and set the  tensio n  dis cs to be lmm gap . 
And 
the timing of tension  re lease can be...

Upper thread cutter lever release 
I Clearance (0 .2 0.4mm) • -
Overlapped more than I mm : 
(Fig. 46) 
thread cutter actuator 
14.  The  cutter  f alls on  the sc 1ssors: 
* The sc1ssors work before  the machine stop::; :>o the 
c
utle r falls a nd  is damaged. 
This kind of tr ouble  occurs 11·hen the  scissors arc not 
set in  the correct  position. To adjust it. first turn the 
cam 
dri1·c handle from the normal slop position of 
the  machine until the scissor  guide  o1·erlap s 11·ith the 
sc1ssors...

5 TROUBLE SHOOTING 
1. Thread breaks 
a. 
Needle  blunt or bent 
b. Needle  too thin 
c.  Needle  plate damaged 
d. Poor quality  of thread  used 
e. 
Too strong  tension  on upper  thread 
f. Improper  threading 
g. Hook point damaged 
h. Out of timing  the hook 
I. Dusts or lints in hook 
2. Stitch skipping 
a. Needle  bent 
b. Incorrect  setting the needle,  height and angle 
c. 
Too thick or thin  needle  size 
d. 
Out of  timing  the hook  and needle 
3. Threading  off 
a. \Veak spring action of...

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