Baby Lock BLE1 AT, Service Manual

3-3 HOW TO REPLACE THE TIMING BELT OF THREAD DELIVER Y UNIT

(see P6) 

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.3, 1-1 

3-4 HOW TO REPLACE THE THREAD DELIVERY UNIT (see P.6)

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.3, 1-1) 
2) Check the stitches (see P.9, 2). 

3-5 HOW TO REPLACE THE SPRINGS OF THREAD DELIVERY UNIT (see P.6) 

a) Stitch connecting arm plate spring 

Hook the spring both side

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 

replacethe spring and space 

at the same time.

d) Disc press spring 

(both front and rear)

1)Remove 5 pcs. of E-ring of the thread press disc shaft and pull out  the press disc shaft  rightward.  

Becareful not to splash the spring. 

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 P3, 1-2)

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