Brother LZ2-B852, LZ2-B853, LZ2-B854 Service Manual
SERVICE
MANUAL
FOR
LZ2-B852
LZ2-B853
LZ2-B854
< <
.
~
r
.
•
BROTHER
INDUSTRIES,
NAGOYA, JAPAN
LTD.
«
MECHANISM~
[I]
Upper shaft and needle
[I]
Lower shaft and rotary hook mechanism
Zig-zag mechanism . . . . . . . . . . . . . . . . . . . 2
m
Feed mechanism . . . . . . . . . . . . . . . . . . . . . 3
m
Presser mechanism
m
II)
Tension release mechanism
Lubrication mechanism
m
...................
bar
mechanism .
..................
...........
..............
CONTENTS
.
.
4
.
4
.
5
1TI1
Sewing tension . . . . . . . . . . . . . . . . . . . . . .
[g)
Feed dog height and level adjustment
[!l] Adjustment
[ill Rotary hook oil level adjustment
[!]] Replacement
[!!] Adjustment
[Q]
Adjustment
winding
of
rotary hook
of
thread cutter
of
thread tension release
of
the quantity
.............................
............
.......
..........
of
the bobbin
...
...
22
22
23
23
24
24
24
DISASSEMBl.ING
PROCEDURES
[I]
Cover
[I]
Rotary hook . . . . . . . . . . . . . . . . . . . . . . . . 7
11]
Feed mechanism . . . . . . . . . . . . . . . . . . . . . 7
[TI
Presser bar and Needle bar . . . . . . . . . . . . 8
[[) Timing belt . . . . . . . . . . . . . . . . . . . . . . . . . 9
~
ASSEMBLING PROCEDURES
[I]
Timing belt . . . . . . . . . . . . . . . . . . . . . . . . . I 0
(I]
Presser bar and Needle bar . . . . . . . . . . . .
[!]
Feed mechanism . . . . . . . . . . . . . . . . . . . . .
III Rotary hook . . . . . . . . . . . . . . . . . . . . . . . .
m (,over
~ADJUSTING
ITJ
Needle
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .
(I]
Needle bar position
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .
11]
Stitch lenght adjustment . . . . . . . . . . . . . .
[TI
Reference position adjustment lever (Needle
position) adjustment . . . . . . . . . . . . . . . . . .
[[) Zigzag width reference position
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .
II)
Zigzag regulator position (Front and Back)
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .
[I]
Needle and feed timing adjustment
[!]
Adjustment
II]
Needle and rotary hook timing adjustment
[ID
Presser foot height adjustment
..................
..............................
PROCEDURES
bar
position (Left and Right)
(Front
of
needle sidewise movement
; . . . . . . . . . . . 6
~-
~
...
and Back)
.....
.........
10
II
13
14
15
16
16
16
16
17
18
19
20
20
21
21
«TROUBLESHOOTING
6
GUIDE~
.
25
~
MECHANISM
[I]
UPPER
I.
When the machine pulley 0 is turned in the direction
the thread take-up crank
2. The movement
needle
3.
The needle
4. The needle b
5.
Finally, the
SHAFT
bar
crank stud 0 which
AND
of
the thread take-up crank e is then
bar
connecting link 0 in tu rn moves the n
ar
cla
thr
ead take-up lever 0 is also driven v
mp
~
NEEDL
e.
0 ,
E BAR
o
oe
is
connected to the
in
turn
. moves the needle bar
MECHANISM
oft
he
arrow,
the
upper
tr
ansmitted to the needle
thr
ead
ee
dle bar cla
f)
ia
the needle
take-up
up
crank
mp
and
down.
bar
crank stud 0 .
shaft
e.
0 up
f)
rotates and
bar
connecting link 0 via the
and
down.
in
turn
rotate
s
IT]
LOWER
I. When the machine pulley 0 is rota ted in the direction
the
2.
ext. timing pulley D 0 . connected to the lower shaft 0 , is rotated by timing pulley U e via the timing belt 0 .
3.
Timing pulley D 0 in turn dri ves the lower sha
4.
Finally,
e. be
upper
the gear
ve
SHAFT
sha
ft f). rotates.
l gear
4]!)
AND
ROTARY
f)
rotations arc transfered
, bevel pinion gea r
HOOK
4D
MECHANISM
ft
0 a nd gear
through
and rotary hook sha
the lower
of
the
ar
row, timing pulley U e, w
f)
.
shaf
ft
t pinion
41}
gear(). the rotary h
to dri
ve
the rotary h
hi
ch is connecte d to
ook
ook
G)
.
drive shaft
- 1 -
IIJ
ZIG-ZAG
MECHANISM
I. When the machine pull
upp
er sha
ft
8 ,
Upp
er s
haft
2.
3. T wo cams 0 are installed oni he s
mod
els LZ2-B8
• The cam
(mod
el LZ2-B854)
4. The needle v
left. (models LZ
• The needle v
a
nd
left. (model LZ2-88
5. The joint
th
e needle bar
*
Th
e a bove explanation a pplies to the mec hanisms
model
gea r 0 rotatio n is
52 and
fD
connected to the s
ibr
ating
ibrating
4D
connecte
4J)
LZ
2-8854
ey
0 is
turn
ed in the
rot
ates.
th
en
transmitt
haft
-8 ;
8853)
haft 8 drive
ro
d 0 is c
2-8852 and
rod 0 is
d to the needle v
whi ch is connected to the fra me asse mbly
are
so
8853)
54)
indic
onn
ected to
connec
ted
ibr
ated with a
direction
ed to the sha
th
e shaft 8
s the roller
the
cam
to the roller
ating rod 0 relays the right
"e
" sy
of the arrow,
ft
8 via
dri
ves the cam guid
guide~
guid
e O a
g
uide~
in models LZ2-B852 and 8853. Those
mbol.
whi ch hol
nd pivo
a nd pivots on the zigzag
f)
.
the upper s
the need
e 0 verti
ds
the t
ts on
the
zigzag
jlc
ft shifting moti
haft gea
le v
ibr
ating gear G.
cally via the t
wo cam
control
control
on
r 0 ,
connected to the
wo
links
rollers G) verticall
G>
to s
hif
t right and
G>
to shift right
of the v
par
ibrating r
ts that
differ in
f).
od
(
on
y.
to
- 2 -
[II FEED
MECHANISM
I. When the lower shaft 0 rotates in the direction
0 turns.
2.
Next, the eccentric
vertically.
3.
The
feed rock
4. The motion
5·.
The end
by means
*
The
assembly
of
the lower shaft 0
of
action
of
0.
of
wheel8,
crank
8 connected to the feed driving lever 8 moves in direct relation
the feed rack crank 8
the upper feed link
steps 4 and 5 determines the movement
which
is
fitted
onto
is
then transmitted
is
the eccentric connecting link stud and vertically drives the feed bar assembly 8
8.
of
the arrow, the eccentric cam 8 connected to the lower shaft
the eccentric cam
to
the feed
of
the feed dog
8,
makes the feed driving lever 8 move
to
the feed regulator
bar
assembly 0 via the feed drive shaft
I)
which
is
connected
to
the feed
8.
8.
bar
-3-
[!]
PRESSER
MECHANISM
•
I. Raising the presser
2. This causes the presser
3.
The
presser foot 8
4.
The
top
of
the presser
adjustment screw 8 increases the pressure on the presser bar.
5. When the knee lifter 8
raises the knee lifter connecting rod 0 and raises the knee lifter lifting link e via the knee lifter horizontal shaft
••
6. The knee lifter lifting link e
[!]
TENSION RELEASE
I. When the presser foot has been raised by the
knee lifter
screw 8 riding on the knee lifter horizontal
shaft 8
2.
The
release pin 8 causing-the tension releasing disc
0,
are
raised.
tension release lever 8 pushes the tension
8 to float. The thread tension assembly
unable
3. When the presser foot
spring 8 applies pressure to the tension disc
the thread tension assembly.
to
apply pressure on the thread.
bar
lifter lever 0 causes the presser
bar
8,
which
is
held by the presser
is
connected
bar 8 is
is
pushed in the direction
MECHANISM
the tension release lever 8 and
is
not raised, the tension
to
the presser
depressed by the presser
is
connected to the needle
is
now
in
bar
clamp 0 to rise.
bar
clamp
0,
to rise.
bar
8 and rises
bar
of
the arrow, the complying bar 8 connected to the oil pan
bar
in
unison with the presser
leaf spring
clamp
8;
0.
bar
8.
tightening down the presser
bar
-4-
[II LUBRICATION
MECHANISM
I. Oil from the oil
2.
Oil
is
supplied from the oil gauge
bar
needle
3.
The
oil
tank
complete.
Oil
that
4.
*
The
*
Arm
* Oil
collects
face plate, name plate, side plate R,
oil shield 0 prevents oil from spraying towards the face plate.
is
supplied to the gear
pump
assembly 0
connecting link 8 oils the frame assembly 0 (needle
8 supplies oil
in
the
arm
to
chin
box
is
supplied to the oil gauge
f)
to the needle
the zigzag mechanism, lower rotary
part
is
sucked into the oil
cover
CJi)
Ill Oil Pump Mechanism
The
pump
gear
f)
I.
attached
2. When the
the screw lifter
shaft
connected
bottom
supplied to the oil gauge, oil tank,
hook.
3.
Oil
rotating shaft
8.
is
intaken
to
the lower shaft turns.
pump
The
to
the two outlet tubes 8
of
the oil
through
8.
* Any oil accumulated in the
suctioned by the felt-covered tube 0 connected
to
the tube 8
assembly.
turns when the
gear
f)
part
(bottom
oil passes
pump
at
the
turns, oil
end)
through
assembly
the eccentric
arm
top
of
gear
is
pumped by
of
the rotating
the tubes
and
the oil
and
part
chin
the oil
and
side
0
on
the
rotary
of
the
part
pump
f)
and
to the bevel gear 8 for the rotary hook.
bar
connecting link 8
pump
arm
cover are each lined with packing
of
the machine from the oil
is
is
and
bar
clamp, etc.).
hook
shaft bushing (middle)
assembly 0 through the felt-tipped tube
oil
tank
tank
8.
8.
Oil sprayed
to
prevent oil leaks.
and
around
rotary
the
hook
O.
-5-
~
DISASSEMBLING
OJ
COVER
*
It
is n
ot
necessary to remove all the covers.
PROCEDURES
~
I.
Remove
2. Remove
3. L
oose
4. Loose n the screw 8 ,
5. Remove the b
6. Remove
7. Remove the two sc rews
IIJ
ROTARY
I.
Rem
dog
2. Tilt the machine.
3. Remove
h
ook position bracke
4. Loosen the
h
ook
th
e two screws 0 ,
th
e two sc rews 8 ,
n the s
cr
ew 0 ,
ad
slide C).
th
e two screws 0 , and
HOOK
ove the
f).
tw
o screws 0 ,
th
e screw 8 ,
two
scre
0 .
t 0 .
wsO,and
and
remove
and
remove the arm
and
remove the need le 0 .
and
remove the presser fo
remo
ve the need le plate
4D
,
an
d remove
and
remove
and
remove
the
remove the
the
thread
the need
the feed
rot
ary
rotary
take-up
cover
ot ().
le plate
0 .
fD
fD
guard
.
.
cover
f)
.
- 6 -
IT]
FEED
MECHANISM
•
I. Pull the wick 0 left
2. Loosen the four screws
3.
Loosen the screw
4. Loosen the screw
5.
Pull the feed drive shaft 8 to the left
6. Now the two collars
7. Refer to page
or
right
and
8,
and
8.
8.
8
and
drive shaft
13
for felt 0 and wick 0 replacement.
•
remove it.
confirm
and
•
that
remove.
arm
•
the two collars 8 move.
assembly 8 can be removed.
0
•
•
-7-
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