Baby Lock Model BLCS User manual

SERVICE MANUAL
MODEL BLCS
Vol 3.1
From
To
Serial Numbers
For U.S.A. For Canada For Europe,
Australia,NZ
100061100390 100383

1.Construction of Covers
10.1
4.6
2.0
1
Distance of chain looper tip from
center of chain looper shaft
Distance of lower looper tip from
center of lower looper shaft
Distance of upper looper tip
from right side of overlock
right needle(O2)
Distance of lower looper tip
from right side of overlock
right needle(O2)
Distance of chain looper tip from right side of chain right needle(C3)
55.4
72.8
4.9 8.6
Height of feed dog
Height of presser foot
Height of overlock right needle(O2)
Adjusting gauge
For BLE8
1

2. Adjustment of Needle,Chain lopper & Presser foot
Height of presser foot
4.8 +0.1
R72.4
0
0.1
Height of needle Chain looper adjustment
1.8 0
+0.1
ELx705CF 90/14 ELx705CF 90/14
ELx705CF 90/14
ELx705CF 90/14
C3 Needle
2
Needle plate
12.5+0.05
C3 Needle
0
0
2.3+0.2
0
Chain Needle
Chain Needle
Needle guard adjustment
0.2-0.3
FRONT SIDE
FRONT SIDE
0-0.02
Chain needle front needle guard
Back needle guard
C3Needle
Chain needle & Chain looper
0-0.1

3. Height of feed dog
CORRECT HEIGHT – When feed dogs are top position, make sure the clearance
of 0.9mm between presser foot and needle plate.
4. Tension release & Dropped feed dog adjustment
4-1.Tension release
a) In case you replace face cover, make sure the tension release lever
catches the Tension release pin correctly (fig.A)
b) Double check disks are open perfectly when presser bar lifter is lifted.
4-2. Dropped feed dog adjustment
Make sure feed dog height is correct,before you adjust following items.
a) Loosen adjusting screw (B).
b) Lift the presser bar lifter and make sure feed dog is dropped position.
c) Rotate machine pully, Make sure Feed dog crutch arm (E) swings up and
down.
d) Tighten the screw (B) until Feed dog crutch arm does not swing.
e) Drop the presser bar lifter, make sure dropped feed dog mechanism does
work correctly when presser bar lifter is lift position.
3

4
0.9 +0.1
0
3.Height of feed dog
4.Tension release & Dropped feed dog adjustment
A
C
B
D
E

5. Checking threading steel pipe joint
a) Set the machine for looper threading.
b) Move the lock button release lever slightly to the right.
c) Check the connecting point whether the looper threading pipe joint and threading
steel pipe is fitted each other properly.
6. Checking pump
6-1 Checking deflate from pump
Holding the pump tube 6, push down the pump lever 15 and check if air is deflated
from pump or not.
6-2 Replacement of Piston Cap
a) Bring the pump lever to the lowest position and fix it with Scotch tape or something like that.
b) Remove bace plate.
c) Remove piston driving arm fixing screw 11 (SM3005IK).
d) Remove piston driving arm from piston driving shaft.
(It will be easy to remove the arm from the shaft, if you push the shaft to the rightward direction.)
e) Remove piston assembly from cylinder
(It will be easy to remove piston assenbly from cylinder, when the needle is in the lowest position.)
f) Replace piston cap.
g) Greace piston cap a little bit.(MOLYKOTE EM-50L)
h) Return piston assembly to cylinder.
i) Fit piston driving arm to piston driving shaft properly and tighten fixing screw SM3005IK firmly.
(It will be easy to fit the armto the shaft, if you push the shaft to the leftward direction.)
j) Check and confirm whether the pump works properly or not.
k) fix bace plate.
5

3
5
4
3
9
8
15
12
13
4
17
2
1
6
10
14
11
16
7
6
Threading steel
pipe
Proper position Unproper position
Joint
5.Checking thread
steel pipe joint
6.Checking pump

8. Trouble Shooting
7. Adjustment of thread take-up
7-1 NEEDLE THREADS ARE UN BALANCED ;
* Is the BLCS threaded correctly? See Instruction Book P.14,15.
* Are the threads snapped in the head guide? See Instruction Book P.15.
* Are the threads recommended high quality? See Instruction Book P.7.
7-2 LOOPER THREADS ARE UNBALANC ED ;
* Is the BLCS threaded correctly? See Instruction Book P.14,15.
* Are the threads snapped in the head guide? See Instruction Book P.15.
* Are the threads recommended high quality? See Instruction Book P.7.
7-3 THREAD BREAKS ;
* Is the BLCS threaded correctly? See Instruction Book P.14,15.
* Are the threads snapped in the head guide? See Instruction Book P.15.
* Are the threads recommended high quality? See Instruction Book P.7.
7-4 JET AIR THREADER DOES NOT WORK
*Is air deflated from pump? See P.13.
*Are pipes connected properly? See P.13.
*Are there any lints or thread in pipes?
7
BLCS3
Correct Position
(Thread take-up is
lowest position.)
CORRECT POSITION: When thread take-up is lowest position, thread take-up and
thread guide are same position. See illustration below.
a). Rotate the machine pully and bring thread take-up at the lowest position.
b). Loosen thread take-up height position adjusting screws.
c). Adjust the thread take-up to correct position. See illustration below.
d). Tighten the fixing screws.
Thread take-up
height position
adjusting screws