Baby Lock Evolve BLE8 User manual

SERVICE MANUAL
MODEL BLE8
Vol 1.02

C
B
A
D
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
1

2. Adjustment of Needle,Lower looper, Upper looper,Chain lopper & Presser foot
R55.4
+0.1
Height of presser foot
4.6+0.2
R72.8
0
0.1
Height of needle
Needle plate
O2Needle
10.1+0.1
0
Upper looper adjustment
8.6+0.2
0
Adjustment of lower looper and upper looper
Lower looper adjustment Chain looper adjustment
Max. 8.5
0.8 +0.3
4.9
0
-0.1 2.0
+0.05
O2Needle
ELx705CF 90/14 ELx705CF
90/14
ELx705CF 90/14
ELx705CF 90/14
O2Needle
C3 Needle
2

3-1Needle guard adjustment (Needle system ELx705CF 90/14 )
A) Overlock Front Needle Guard Adjustment (You are required to adjust this adjustment first)
a) Remove overlock back needle guard.
b) Rotate the machine pulley and lower the needle to the lowest position.
c) Make a clearance of 0mm between front & back needle guard and needle.
d) Rotate the machine pulley and make sure the clearance of 0mm between
the front & back needle guard and the needle.
B) Overlock Rear Needle Guard Adjustment
a) Replace the overlock back needle guard
b) Rotate the machine pulley and bring top of lower looper at the needle position.
c) Make a clearance of 0mm between the overlock back needle guard and needle.
d) Rotate the machine pulley and make sure the clearance of 0mm between
the overlock back needle guard and the needle.
C) Chain Needle Front Needle Guard Adjustment
a) Rotate the machine pulley and lower the needle to the lowest position.
b) Make sure clearance of 0.2 - 0.3mm between the chain looper front needle guard
and the C3 needle.
c) Rotate the machine pulley and bring top of chain looper at the right side of the C3
needle on the way of FORWARD of the chain looper.
d) Adjust the chain looper front needle guard towards the C3 needle ,make a
clearance of 0 ~0.02mm between the front & back needle guard and C3 needle.
3-2 CHAIN LOOPER THREAD TAKE-UP ADJUSTMENT
A) Timing Adjustment
CORRECT TIMING - When the thread take-up is lowest position,the eye of chain looper at
the center of the C1 needle on the way of RETURNING of the chain looper.
a) Loosen timing adjustment screw (A) and rotate the thread take - up driving cam at
the correct position
b) Tighten the fixing screw (A) firmly.
B) Thread take-up height position adjustment
3
a) Rotate the machine pulley and bring thread take-up at the lowest position.
b) Loosen thread take -up height position adjustment screw (B).
c) Make a distance 16 mm between top of thread guide and top of thread take-up.
d) Tighten the fixing screw (B) firmly.
3-3 Chain needle tension unit adjustment
thread : 100% polyester spun thread (maxi- lock or metrosene)
a) Remove a seal of chain needle tension knob.
b) Rotate tension knob at 0 position .
c) Loosen chain needle tension adjusting screw.
d) Threading chain needle tension unit with spun thread and pull the thread from the
tension unit.
e) Rotate the tension knob and make a tension of
55g.
f) Tighten the screw firmly and replace the seal.

2.3
+0.2
0
2.3
+0.2
0
Overlock
Needle
Overlock
Needle
Chain
Needle
Chain
Needle
16
Chain needle tension
adjusting screw
55
3-1 Needle guard adjustment
0.2-0.3
FRONT
SIDE
FRONT
SIDE
Timing
adjustment
screw (A)
Chain needle
thread take-up
height adjustment
screw (B)
3-2 Chain looper thread take-up adjustment
0 0.5
3-3 Chain needle tension unit adjustment
0
0-0.02
0
0
0
00
Chain needle
front needle
guard
Front & back
needle guard
Overlock back
needle guard
C3Needle
Thread take-up
driving cam
C1 Needle
5g
0
4
C3
Needle Thread

Before adjustment of Thread delivery System(ATD)
In case you can not get the proper stitches,please check the following items before you adjust the
Thread Delivery System.
a) Is thread positioned between discs? Double check the thread position.
b) Does spring in the head thread guide catch thread properly?
BLE1AT’s head thread guide is exclusive for BLE1A
T. You can not use other head thread
guides for LX,DX,SX on BLE1AT.
c) Is senser cable positioned on rollers?
Double check each sensor cable is positioned on rollers especially the one in the back of fine
tuning screw.
d) Is stitch selector dial positioned correctly?
e) Is each thread threaded correctly according to the quick threading reference guide?
4. Adjustment of Thread Delivery Unit
4-1 OPEN-SHUT TIMING OF TENSION DISCS
CORRECT TIMING - When upper looper is lowest position, front tension discs
should be just shut perfectly.
How to adjust timing
a) Loosen 2 pcs of thread delivery unit timing pulley fixing screw .
b) Rotate the machine pulley and lower the upper looper at the bottom.
c) Turn the thread delivery cam toward you until the front thread press disc shuts.
d) Tighten 2 pcs of thread delivery unit timing pulley fixing screw and make sure to
fit the thread delivery unit timing pulley..
Note:The screws of thread derivery cam and thread derivery changing cam
should be placed in line.
4-2 CLEARANCEA AND B FOR THREAD PRESS POST ARM
CORRECT CLEARANCE – 0.4mm(both front and rear)
How to adjust clearance
A) Rear clearance adjustment (You are required to adjust this adjustment first.)
a) Rotate the machine pulley and rear tension discs at the shut position.
b) Loosen fixing screw of thread delivery changing cam .
c) Make a clearance of 0.4 mm between rear thread press driving arm and thread
press disc shaft.
d) Move the thread delivery changing cam to rightward and tighten screws firmly..
e) Rotate the machine pulley and make sure the clearance of 0.4mm between the rear
thread press driving arm and thread press shaft.
B) Front clearance adjustment
a) Rotate the machine pulley and front tension discs at the shut position.
b) Loosen fixing screw of front thread press driving arm1 .
c) Make a clearance of 0.4 mm between the front thread press driving arm 2 and
thread press disc shaft.
e) Tighten fixing screw firmly
f) Rotate the machine pulley and make sure the clearance of 0.4mm between the
front thread press driving arm 2 and thread press shaft.
5
T’ T.
6
.
Note
.
.
sure the rear
.
.
Note: After adjusting rear and front clearance, make sure clearance of 0.9 mm between the discs.
5
7
7 8
8
8
9 1
3
9

0.9mm 0.4mm
Rear clearance adjustment
A
Front clearance adjustment
B
4
5
6
7
8
8
12
3
12
9
3
Shut
position
Shut
position
0.4
0.4
Open
position
Open
position
6

4-3 HOW TO REPLACE THE TIMING BELT OF THREAD DELIVERY UNIT
a) Loosen the presser foot joint link fixing screw A( 24 upper screw).
b) Loosen the thread delivery unit fixing screw .
c) Remove 2 pcs of the thread delivery unit fixing screw .
d) Push the thread delivery unit downward and remove the timing belt of thread delivery unit .
Then, remove the motor belt and you can replace the timing belt of thread delivery unit.
e) Return 2 pcs of the thread delivery unit fixing screw .
You are required to adjust the clearance at 1mm between handle and the timing pulley. (E)
f) Tighten the screw and screw A( 24 upper screw).
g) Adjustment of timing (see P.5, 5-1)
4-4 HOW TO REPLACE THE THREAD DELIVERY UNIT
a) Remove the selector knob link fixing screw & spacer.
b) Remove 3 pcs of sensor cable B, C & D.
c) Remove 3 pcs of thread delivery unit fixing screw & .
d) Remove the thread delivery unit timing belt and you can remove the thread delivery unit from
the machine.
e) Replace the thread delivery unit and assemble each part in the order of d) - c) - b) - a).
f) Make sure that the 3 pcs of sensor cable are exactly in the roller..
g) After you replace the thread delivery unit, you are required to adjust and check following items;
1) Adjustment of timing (see P.5, 4-1)
2) Check the stitches (see P.11,5)
4-5 HOW TO REPLACE THE SPRINGS OF THREAD DELIVERY UNIT
b) Looper thread pulling plate spring Hook the spring both side
c) Thread pulling movable spring
Remove the edge of hook of thread pulling movable spring , loosen the fixing screw
and replace the spring and space at the same time.
d) Disc press spring (both front and rear)
a) Stitch connecting arm plate spring Hook the spring both side
2) After you replace the spring , insert the thread press disc shaft slowly from the right side.
3) Pushing the thread press disc shaft from the right side, rotate the machine pulley until the
thread press driving arm reaches the far left.
4) Replace 5 pcs. of E-ring.
5) Make a clearance of 0.4mm between the thread press driving arm and thread press disc
shaft . (see P5, 4-2)
1) Remove 5 pcs. of E-ring of the thread press disc shaft and pull out the press disc shaft
right ward. Be careful not to splash the spring.
7
11
11
1
11
12
10
14
10 11
12
3
2
5
6
57
4
4

298
411
12
6
7
3
1
10
13
14
19
20
21
22
24 30 31
28
27
26
29
25
23
5
A
B
D C
8

4-6 REPLACEMENT OF SENSOR CABLE
Needle thread and looper thread sensor cable consists of 113 pcs of fine stainless wire
and its pulling strength is 13kg (3 lb.). Therefore, it is almost unnecessary to replace
the sensor cable. In case you replace the cable, refer the followings;
There are 3 types of sensor cable and each cable is dif ferent length.
* Fabric thickness sensor cable 3 Mono wire
* Needle thread sensor cable 2 about 320mm (12 inch.)
* Looper thread sensor cable 1 about 498mm (20 inch.)
a) Replacement of fabric thickness sensor cable 3
1) Remove the cable
2) Hook the cable both side.
3) Check the stitches (see P.11,2)
b) Replacement of needle thread sensor cable 2
1) Move the stitch joint arm plate B to the right and remove the needle thread sensor cable2.
2) Replace the cable and make sure that the cable is in each 4 grooves of guide roller.
3) Check the stitches (see P.9,2).
c) Replacement of looper thread sensor cable 1
1) Move the looper thread pulling plate C to the left and remove the looper thread sensor
cable1.
2) Replace the cable and make sure that the cable is in each 5 grooves of guide roller.
3) Check the stitches (see P.11,2).
9

4
5
13
6
16
15
3
2
1
5
7
18
17
5
20
19 23
5
21
24
22
10
9
4
5
12
4
8
11
14
10

5. ADJUSTMENT OF STITCHES
Fabric : cotton 1-layer
Thread : 100% polyester spun thread (maxi-lock or metrosene thread)
Needle : SCHMEZ ELx705 90/14
Machine: 1-needle (right), 3-thread sewing
Width : 5.0mm (max)
Length : 3.0mm
D.F
. : N
Stitch selector : B
5-1 ADJUSTMENT OF NEEDLE THREAD SENSOR CABLE
The needle thread sensor cable effects the timing of both needle thread and
looper threads. You are required to adjust this cable first.
NOTE: The needle thread sensor cable adjusting screw works;
Turn clockwise and both needle & looper threads become loose.
Turn counter-clockwise and both needle & looper threads become tight.
a) Line up the looper thread fine-tuning screw at the standard position.
b) Sew 1-layer of cotton with 1-needle (right) 3-thread as shown in the above
and adjust only the needle thread in the stitch not to have a puckering.
Disregard the looper threads in the stitch at this stage.
c) Then, adjust the looper thread sensor cable (5-2).
5-2 ADJUSTMENT OF LOOPER THREAD SENSOR CABLE
Before the adjustment of looper thread sensor cable, adjust the needle
thread sensor cable first (5-1).
NOTE: The looper thread sensor cable adjusting screw works;
* Turn clockwise and looper threads become loose.
* Turn counter-clockwise and looper threads become tight.
a) Line up the looper thread fine-tuning screw at the standard position.
b) Sew 1-layer of cotton with 1-needle (right) 3-thread as shown in the previous page and turn the
screw until you get the ideal stitch which looper threads are not loose and fabric is not curled.
c) After adjustment of looper thread sensor cable, the timing of needle thread
might be changed. Therefore, check the needle thread sensor cable again (see 5-1).
11

Needle thread sensor cable
Looper thread
sensor cable
Looper thread sensor cable
adjusting screw
Needle thread sensor
cable adjusting screw
Standard Position
Fine Tuning screw
12
Turn Clockwise Become Loose
Turn Counter-clockwise Become Tight

6. 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. .
7. Checking pump
7-1 Checking deflate from pump
pump or not.
7-2 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.
Holding the pump tube 6, push down the pump lever 15 and check if air is deflated from
i) Fit piston driving arm to piston driving shaft properly and tighten fixing screw SM3005IK firmly.
(It will be easy to fit the arm to 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.
13

3
5
4
3
9
8
15
12
13
4
17
2
1
6
10
14
11
16
7
14

8. TROUBLE SHOOTING
8-1 NEEDLE THREADS ARE UNBALANCED ;
* Is the serger threaded correctly? See Quick Reference Guide
* Are the threads snapped in the head guide? See Instruction Book P
.23
* Is the stitch selector positioned correctly? See Quick Reference Guide
* Is the looper thread fine-tuning screw positioned correctly?
See Instruction Book P
.16
* Are the threads recommended high quality? See Instruction Book P.7
* Is the needle thread sensor cable positioned correctly? See P9, 4-6
* Is the needle thread sensor cable adjusted correctly? See P1
1, 5
8-2 LOOPER THREADS ARE UNBALANCED ;
* Is the serger threaded correctly? See Quick Reference Guide
* Are the threads snapped in the head guide? See Instruction Book P.20
* Is the stitch selector positioned correctly? See Quick Reference Guide
* Is the looper thread fine-tuning screw positioned correctly?
See Instruction Book P.16
* Are the threads recommended high quality? See Instruction Book P.7
* Is the looper thread sensor cable positioned correctly? See P9, 4-6
* Is the looper thread sensor cable adjusted correctly? See P1
1, 5
8-3 THREAD BREAKS ;
* Is the serger threaded correctly? See Quick Reference Guide
* Are the threads snapped in the head guide? See Instruction Book P.20,23
* Is the stitch selector positioned correctly? See Quick Reference Guide
* Is the looper thread fine-tuning screw positioned correctly?
See Instruction Book P.16
* Are the threads recommended high quality? See Instruction Book P.7
8-4 JET AIR THREADER DOES NOT WORK
*Is air deflated from pump? See P13, 67
*Are pipes connected properly? See P13, 6
*Are there any lints or thread in pipes?
15