Brother LH4-B814-2 User manual

INST .RUCTION MANUAL
FOR
BROTHER LH4-B814-2, -3, -5
BROTHER INDUSTRIES, LTD.
NAGOYA, JAPAN
From the library of: Superior Sewing Machine & Supply LLC

~ 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
From the library of: Superior Sewing Machine & Supply LLC

~ 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.
From the library of: Superior Sewing Machine & Supply LLC

~
,...
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-
From the library of: Superior Sewing Machine & Supply LLC

~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-
~-
From the library of: Superior Sewing Machine & Supply LLC