Baby Lock Denim Pro BL 18 User manual

SERVICE MANUAL
Denim Pro
Model BL 18

SERVICE ACCESS
FACE COVER ................................................................................................................... 1
BELT COVER ................................................................................................................... 1
BASE PLATE .................................................................................................................... 2
FRONT COVER ................................................................................................................ 3
REAR COVER .................................................................................................................. 4
MECHANICAL ADJUSTMENT
NEEDLE THREAD TENSION ........................................................................................... 5
BOBBIN TENSION ............................................................................................................ 6
PRESSER BAR HEIGHT AND ALIGNMENT ................................................................... 7
NEEDLE SWING ............................................................................................................... 8
NEEDLE DROP ................................................................................................................ 9
CLEARANCE BETWEEN NEEDLE AND HOOK
ADJUSTMENT METHOD NO.1 ................................................................................ 10
ADJUSTMENT METHOD NO.2 ................................................................................ 11
FEED DOG HEIGHT ....................................................................................................... 12
NEEDLE BAR HEIGHT ................................................................................................... 13
NEEDLE TIMING TO SHUTTLE ..................................................................................... 14
BUTTONHOLE FEED BALANCE ................................................................................... 15
FEED BALANCE ON STRETCH STITCH ...................................................................... 16
BARTACK FEED OF BUTTONHOLE ............................................................................. 17
DISENGAGEMENT OF CAM FOLLOWER .................................................................... 18
MOTOR BELT TENSION ................................................................................................ 19
WIRING ........................................................................................................................... 20

1
SERVICE ACCESS
FACE COVER
TO REMOVE:
1. REMOVE THE FACE COVER BY REMOVING THE CAP (A) AND SETSCREW (B).
BELT COVER
TO REMOVE:
1. LOOSEN SETSCREW (C).
2. TAKE THE BELT COVER OUT.
TO ATTACH:
3. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(C)
(C)
BELT COVER
TO ATTACH:
2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(A) (B)
FACE COVER

2
SERVICE ACCESS
BASE PLATE
TO REMOVE:
1. REMOVE THE SETSCREWS (A).
2. REMOVE THE BASE PLATE.
TO ATTACH:
3. MOUNT THE BASE PLATE AND SECURE IT WITH FOUR SETSCREWS.
BASE PLATE
(A)

3
SERVICE ACCESS
FRONT COVER
TO REMOVE:
1. REMOVE THE FACE COVER, AND REMOVE THE BELT COVER (SEE PAGE 1).
2. REMOVE DIALS (A), (B).
3. LOOSEN SETSCREWS (C), (D), (E), (F), AND (G), REMOVE SETSCREWS (H), (I) AND (J),
AND THEN, REMOVE THE FRONT COVER.
NOTE: UNHOOK THE TAB (K) FROM THE REAR COVER WHEN REMOVING THE
FRONT COVER.
TO ATTACH:
4. MOUNT THE FRONT COVER IN REVERSE PROCEDURE OF THE REMOVING.
(A)
(I)
(J)
(K)
(H)
(E)
(F)
(G)
(D)
FRONT COVER
(C)
(B)
CAP

4
SERVICE ACCESS
REAR COVER
TO REMOVE:
1. REMOVE THE FACE COVER AND BELT COVER (SEE PAGE 1).
NOTE: PULL UP THE SPOOL PINS.
2. LOOSEN SETSCREWS (A), (B), (C) AND (D) (2 PCS.), REMOVE SETSCREWS (E), (F), (G)
AND (H), AND THEN, REMOVE THE REAR COVER.
NOTE: REMOVE THE REAR COVER IN THE ORDER OF (X) (LOWER PART) (Y)
(UPPER PART) (Z) (PRESSER FOOT LIFTER PART). (REMOVE THE BED COVER
TOGETHER.)
TO ATTACH:
3. MOUNT THE REAR COVER IN REVERSE PROCEDURE OF THE REMOVING.
(A)
(B)
(C)
(F)
(E)
REAR COVER
(D)
(H)
(G)
(Y)
(X)
(Z)
CAP

5
MECHANICAL ADJUSTMENT
NEEDLE THREAD TENSION
TO CHECK:
THE STANDARD UPPER THREAD TENSION SHOULD BE 65–95 g WHEN PULLING THE
THREAD (COTTON THREAD #50) IN THE DIRECTION OF (B) WITH SETTING THE TENSION
DIAL AT “3.” (MAKE SURE THE FOOT SHOULD BE LOWERED.)
IF THE TENSION IS OUT OF THE STANDARD RANGE, ADJUST IT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. REMOVE THE FRONT COVER UNIT (SEE PAGE 3).
2. TURN THE ADJUSTING NUT (C) IN THE DIRECTION OF (D) WHEN THE UPPER THREAD
TENSION IS TOO TIGHT.
TURN THE ADJUSTING NUT (C) IN THE DIRECTION OF (E) WHEN THE UPPER THREAD
TENSION IS TOO LOOSE.
3. ATTACH THE FRONT COVER UNIT.
(B)
(C)
(E)
(D)

6
MECHANICAL ADJUSTMENT
BOBBIN TENSION
TO CHECK:
SET THE BOBBIN IN THE BOBBIN CASE AND PASS THE THREAD (COTTON #50) THROUGH
THE TENSION SPRING.
THE BOBBIN THREAD TENSION SHOULD BE 45–55g WHEN PULLING THE THREAD IN THE
DIRECTION OF (B).
IF THE TENSION IS OUT OF THE RANGE, ADJUST IT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (D) WHEN THE BOBBIN
THREAD TENSION IS TOO TIGHT.
2. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (E) WHEN THE BOBBIN
THREAD TENSION IS TOO LOOSE.
(B)
(E)
(D)
(C)
COTTON THREAD #50

7
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT AND ALIGNMENT
TO CHECK:
1. RAISE THE PRESSER FOOT LIFTER (A).
2. THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE (E)
SHOULD BE 6.0 MM (0.24").
ADJUSTMENT PROCEDURE:
1. REMOVE THE FACE COVER (SEE PAGE 1).
2. REMOVE THE SCREW (B) AND THE LAMP SOCKET, THEN LOOSEN THE SCREW (C)
ON THE PRESSER BAR HOLDER.
ADJUST THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE
(D) TO 6.0 MM (0.24").
3. TIGHTEN THE SCREW (C) SECURELY.
4. TIGHTEN THE SCREW (B) TO SECURE THE LAMP SOCKET.
5. ATTACH THE FACE COVER.
NOTE: WHEN YOU TIGHTEN THE SCREW (B), MAKE SURE THAT BOTH SIDES OF THE
PRESSER FOOT ARE PARALLEL TO THE FEED DOG SLOTS (F) IN THE
NEEDLE PLATE.
(C)
(A)
(D)
(E)
(F)
6.0 MM
(B)

8
MECHANICAL ADJUSTMENT
NEEDLE SWING
TO CHECK:
ADJUST THE NEEDLE SWING ACCORDING TO THE FOLLOWING PROCEDURE, IF THE
NEEDLE BAR STARTS MOVING SIDEWAYS WHILE THE NEEDLE IS IN THE FABRIC AT
SEWING THE ZIGZAG PATTERN (WITH MAXIMUM ZIGZAG WIDTH).
ADJUSTMENT PROCEDURE:
1. SET THE PATTERN SELECTOR DIAL WITH MAXIMUM ZIGZAG WIDTH, AND REMOVE
THE FRONT COVER (SEE PAGE 3).
2. LOOSEN TWO SETSCREWS.
3. ADJUST THE NEEDLE SWING BY TURNING THE HANDWHEEL, WHILE HOLDING THE
WORM SO AS NOT TO ROTATE IT, UNTIL THE NEEDLE SWING STARTS 2–3 MM
ABOVE THE NEEDLE PLATE AFTER THE NEEDLE HAS COME OUT OF THE RIGHT
SIDE OF THE NEEDLE HOLE.
4. TIGHTEN TWO SETSCREWS.
5. MOUNT THE FRONT COVER.
NOTE: AFTER ADJUSTING THE NEEDLE SWING, CHECK THAT THE UPPER SHAFT
WORM AND GEAR ROTATE SMOOTHLY WITHOUT ANY BACKLASH
BETWEEN THEM.
UPPER SHAFT WORM
GEAR
SETSCREW
(2PCS.)
2–3 MM

9
MECHANICAL ADJUSTMENT
NEEDLE DROP
TO CHECK:
WHEN THE NEEDLE SWINGS IN MAXIMUM ZIGZAG WIDTH, THE DISTANCE BETWEEN
BOTH ENDS OF THE NEEDLE HOLE IN THE NEEDLE PLATE AND THE NEEDLE DROP
POSITIONS SHOULD BE EQUAL.
IF NOT, ADJUST AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. REMOVE THE FACE COVER (SEE PAGE 1).
2. SET THE PATTERN SELECTOR DIAL AT MAXIMUM ZIGZAG WIDTH.
3. LOOSEN THE SETSCREW.
4. TURN THE ECCENTRIC PIN TO ADJUST THE NEEDLE DROP.
5. TIGHTEN THE SETSCREW.
6. ATTACH THE FACE COVER.
NOTE: CHECK THE HOOK TIMING AFTER THIS ADJUSTMENT.
ECCENTRIC PIN
SETSCREW
BOTH CLEARANCES SHOULD BE EQUAL

10
MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND HOOK (ADJUSTMENT METHOD NO. 1)
TO CHECK:
THE CLEARANCE BETWEEN THE NEEDLE AND SHUTTLE RACE SHOULD BE –0.05 TO
+0.10 MM.
IF NOT, ADJUST AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. REMOVE THE FACE COVER (SEE PAGE 1).
2. SET THE PATTERN SELECTOR DIAL AT " ".
3. LOOSEN SCREW (A), AND MOVE THE NEEDLE BAR SUPPORTER IN THE DIRECTION
OF THE ARROWS TO GET A CLEARANCE BETWEEN –0.05 TO +0.10 MM.
* IF CLEARANCE IS TOO WIDE, MOVE THE NEEDLE BAR SUPPORTER IN THE
DIRECTION (B).
* IF CLEARANCE IS TOO NARROW, MOVE THE NEEDLE BAR SUPPORTER IN THE
DIRECTION (C).
NOTE: AFTER THIS ADJUSTMENT, CHECK THAT THE CLEARANCE BETWEEN THE
NEEDLE AND NEEDLE PLATE IS 0.15 MM OR MORE AS SHOWN IN FIGURE
(D).
IF NOT, ADJUST THE CLEARANCE BETWEEN NEEDLE AND SHUTTLE
RACE BY USING ADJUSTMENT METHOD, ABOVE AFTER READJUST THE
CLEARANCE BETWEEN NEEDLE AND NEEDLE PLATE IS 0.15 MM OR MORE.
4. ATTACH THE FACE COVER.
SCREW (A)
DIRECTION (C)
DIRECTION (B)
NEEDLE BAR SUPPORTER
–0.05 TO +0.10 MM
FIGURE (D)
CLEARANCE BETWEEN NEEDLE AND
NEEDLE
PLATE SHOULD BE 0.15 MM OR MORE.

11
MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND HOOK (ADJUSTMENT METHOD NO.2)
TO CHECK:
USE THIS ADJUSTMENT METHOD NO. 2 IF THE CLEARANCE CANNOT BE ADJUSTED
BY METHOD NO.1.
THE CLEARANCE BETWEEN THE NEEDLE AND SHUTTLE RACE SHOULD BE –0.05
TO +0.10 MM.
ADJUSTMENT PROCEDURE:
1. SET THE PATTERN SELECTOR DIAL AT " ".
2. REMOVE THE REAR COVER (SEE PAGE 4).
3. LOOSEN THE SCREW (A) ON THE LOWER SHAFT BUSHING AND SLIDE THE GEAR
ABOUT 0.5 MM TO THE RIGHT TO CREATE SOME SLACK BETWEEN THE GEARS.
4. LOWER THE NEEDLE AND LOOSEN THE TWO SHUTTLE RACE SETSCREWS (B).
PULL UP OR PUSH DOWN THE SHUTTLE RACE TO ADJUST THE CLEARANCE
BETWEEN THE NEEDLE AND THE SHUTTLE RACE IN THE RANGE OF – 0.05 TO +
0.10 MM.
5. SET THE PATTERN SELECTOR DIAL AT " ", TURN THE HANDWHEEL TO CHECK
IF THE CLEARANCE BETWEEN THE NEEDLE AND INNER EDGES OF THE SHUTTLE
RACE SPRING AT THE LEFT AND RIGHT NEEDLE DROPS ARE EQUAL.
IF NOT, ADJUST BY TURNING THE SHUTTLE RACE UNIT.
6. TIGHTEN THE TWO SHUTTLE RACE SETSCREWS (B).
7. SLIDE THE GEAR BACK TO THE ORIGINAL POSITION WHILE ADJUSTING THE
BACKLASH.
8. TIGHTEN SCREW (A) FIRMLY.
9. ATTACH THE REAR COVER.
NOTE: THE BACKLASH SHOULD BE 0.3 MM OR LESS AND THE LOWER SHAFT
SHOULD TURN SMOOTHLY.
AFTER THE ADJUSTMENT, CHECK THE HOOK TIMING.
–0.05 TO +0.10 MM
CLEARANCE SHOULD BE EQUAL
SHUTTLE RACE
SETSCREWS (B) (2 ) LOWER SHAFT
BUSHING (FRONT)
NEEDLE
SHUTTLE RACE
SPRING
SETSCREW (A)
LOWER SHAFT
BOSS

12
MECHANICAL ADJUSTMENT
FEED DOG HEIGHT
TO CHECK:
1. LOWER THE PRESSER FOOT.
2. TURN THE HANDWHEEL TOWARD YOU TO BRING THE FEED DOG TO ITS HIGHEST
POSITION. THE HEIGHT OF THE FEED DOG FROM THE NEEDLE PLATE SHOULD BE
0.75 TO 0.90 MM.
IF IT IS NOT IN THE RANGE, ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:
1. OPEN THE SHUTTLE COVER.
2. LOWER THE PRESSER FOOT AND TURN THE HANDWHEEL TOWARD YOU UNTIL
THE FEED DOG COMES TO ITS HIGHEST POINT.
3. LOOSEN THE SCREW (A) .
4. TURN THE FEED LIFTING PIN TO ADJUST THE HEIGHT OF FEED DOG (0.75–0.90 MM).
5. TIGHTEN THE SCREW (A).
6. TURN THE HANDWHEEL TOWARD YOU TO RECHECK THE HEIGHT OF FEED DOG.
SCREW (A)
FEED LIFTING PIN
0.8 MM
NEEDLE PLATE

13
MECHANICAL ADJUSTMENT
NEEDLE BAR HEIGHT
TO CHECK:
WHEN THE TIP OF SHUTTLE HOOK MEETS THE LEFT SIDE OF THE NEEDLE IN
ASCENDING TRAVEL OF THE NEEDLE FROM ITS LEFT AND LOWEST POSITION,
THE DISTANCE BETWEEN THE TOP OF THE NEEDLE EYE AND THE TIP OF THE
SHUTTLE HOOK SHOULD BE IN THE RANGE OF 2.9–3.5 MM.
ADJUSTMENT PROCEDURE:
1. OPEN THE FACE COVER.
2. SET THE PATTERN SELECTOR DIAL AT " ".
3. OPEN THE SHUTTLE COVER.
4. REMOVE THE SHUTTLE RACE RING.
5. TURN THE HANDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK
MEETS THE LEFT SIDE OF THE NEEDLE.
6. LOOSEN THE NEEDLE BAR CONNECTING STUD SCREW (A).
7. ADJUST THE HEIGHT OF THE NEEDLE BAR BY MOVING THE NEEDLE BAR UPWARD
OR DOWNWARD WITHOUT TURNING IT.
8. TIGHTEN THE SCREW (A).
9. ATTACH THE SHUTTLE RACE RING.
SCREW (A)
NEEDLE BAR
TIP OF SHUTTLE HOOK MEETS
LEFT SIDE OF NEEDLE
2.9–3.5 MM

14
MECHANICAL ADJUSTMENT
NEEDLE TIMING TO SHUTTLE
TO CHECK:
THE HEIGHT OF THE NEEDLE POINT FROM ITS LOWEST POINT SHOULD BE IN THE
RANGE OF 1.45–1.95 MM WHEN THE TIP OF THE SHUTTLE HOOK MEETS THE LEFT
SIDE OF THE NEEDLE AT THE LEFT NEEDLE POSITION IN ASCENDING TRAVEL.
ADJUSTMENT PROCEDURE:
1. SET THE PATTERN SELECTOR DIAL AT “ ”.
2. REMOVE THE BASE (SEE PAGE 2).
3. OPEN THE SHUTTLE COVER.
4. REMOVE THE SHUTTLE RACE RING.
5. TURN THE HSNDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK
MEETS THE LEFT SIDE OF THE NEEDLE.
6. LOOSEN THE LOWER SHAFT CRANK ARM SCREWS (A).
7. WHILE HOLDING THE SHUTTLE HOOK SO IT DOESN'T TURN, TURN THE
HANDWHEEL TOWARD YOU UNTIL THE NEEDLE COMES TO ITS LOWEST
POSITION.
THEN, FURTHER TURN THE BALANCEWHEEL TO RAISE THE NEEDLE ABOUT 1.7
MM FROM ITS LOWEST POSITION.
8. TIGHTEN THE SCREWS (A).
9. TURN THE BALANCEWHEEL TOWARD YOU TO CHECK IF THE HEIGHT IS IN THE
RANGE OF 1.45-1.95 MM.
IF IT IS NOT IN THIS RANGE, REPEAT THE ABOVE PROCEDURE.
10. ATTACH THE SHUTTLE RACE RING.
11. ATTACH THE BASE.
LOWER SHAFT CRANK ARM
SCREWS (A) (2)
1.45–1.95 MM
LOWEST POSITION
LOWER SHAFT

15
MECHANICAL ADJUSTMENT
BUTTONHOLE FEED BALANCE
TO CHECK:
WHEN SEWING BUTTONHOLE, THE STITCHES ON EACH SIDE OF BUTTONHOLE SHOULD
BE THE SAME STITCH DENSITY.
THE RANGE OF 9-12 STITCHES IN THE RIGHT SIDE ROW (BACKWARD FEEDING)
AGAINST 10 STITCHES IN THE LEFT SIDE ROW (FORWARD FEEDING) IS CONSIDERED
ACCEPTABLE.
ADJUSTMENT PROCEDURE:
1. CHECK THE FEED BALANCE BY SEWING BUTTONHOLES.
2. REMOVE THE CAP ON THE FRONT COVER.
3. TURN THE ADJUSTING SCREW IN THE DIRECTION OF (C) IN CASE OF (A) (RIGHT
STITCHES ARE COARSE), OR IN THE DIRECTION OF (D) IN CASE OF (B) (LEFT
STITCHES ARE COARSE).
4. MOUNT THE CAP.
AB
FORWARD FEEDING BACKWARD FEEDING ADJUSTING SCREW
(D) (C) CAP
NOTCH

16
MECHANICAL ADJUSTMENT
FEED BALANCE ON STRETCH STITCH
TO CHECK:
IF THE STRETCH STITCH PATTERNS ARE DISTORTED WITH SETTING THE STITCH
LENGTH DIAL AT " ".
IN CASE OF BEING A DIFFERENCE BETWEEN FORWARD FEEDING AND BACKWARD
FEEDING DURING STRETCH STITCH PATTERN SEWING, MAKE AN ADJUSTMENT AS
FOLLOWS:
ADJUSTMENT PROCEDURE:
1. REMOVE THE CAP ON THE REAR COVER.
2. SET THE PATTERN SELECTOR DIAL AT " " , AND THE STITCH LENGTH DIAL AT " ".
3. TURN THE STRETCH STITCH ADJUSTING SCREW IN THE DIRECTION OF (C) WHEN
A > B, OR IN THE DIRECTION OF (D) WHEN A < B.
4. ATTACH THE CAP.
(D)(C)
STRETCH STITCH
ADJUSTING SCREW
A=B A>B A<B
CAP
NOTCH
A
A
1
23B
A
A
1
23B
A
A
1
23B

17
MECHANICAL ADJUSTMENT
BARTACK FEED OF BUTTONHOLE
TO CHECK:
IF THE MATERIAL IS FED FORWARD OR BACKWARD WHEN SEWING BARTACK ON
BUTTONHOLE, MAKE AN ADJUSTMENT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. SET THE PATTERN SELECTOR DIAL AT " ", AND THE STITCH LENGTH DIAL AT "4".
2. REMOVE THE FRONT COVER (SEE PAGE 3).
3. PLACE A PIECE OF PAPER UNDER THE FOOT AND TURN THE HANDWHEEL.
IF THE PAPER IS FED FORWARD, TURN THE ADJUSTING SCREW IN THE DIRECTION
OF (C).
IF THE PAPER IS FED BACKWARD, TURN THE ADJUSTING SCREW IN THE
DIRECTION OF (D).
4. ATTACH THE FRONT COVER.
ADJUSTING SCREW
(D) (C)
BACKWARD FEEDING
FORWARD FEEDING
STITCH LENGTH DIAL
4
2

18
MECHANICAL ADJUSTMENT
DISENGAGEMENT OF CAM FOLLOWER
TO CHECK:
IF THE CLEARANCE BETWEEN THE CAM FOLLOWER AND THE TOP CONVEX OF THE
ZIGZAG CAM IS NOT ENOUGH, THE PATTERN SELECTOR DIAL IS BLOCKED OR WILL
NOT SELECT THE CORRECT PATTERN.
ADJUSTMENT PROCEDURE:
1. REMOVE THE FRONT COVER (SEE PAGE 3).
2. SET THE PATTERN SELECTOR DIAL AT PATTERN " " AND THE STITCH WIDTH
CONTROL AT (5).
3. PUT THE CAM FOLLOWER TO THE ZIGZAG CAM AND PUT THE CAM FOLLOWER
RELEASING ARM TO THE PATTERN SELECTOR CAM.
4. LOOSEN THE SET SCREW.
5. PUSH THE CONVEX PART OF THE CAM FOLLOWER RELEASING ARM IN THE
DIRECTION OF ARROW UNTIL THE CAM FOLLOWER RELEASING ARM TOUCHES
POSITION (A) OF THE PATTERN SELECTOR CAM, AND THEN, TIGHTEN THE
SETSCREW.
NOTE: AFTER THIS ADJUSTMENT, CHECK THAT THE CLEARANCE BETWEEN THE
ZIGZAG CAM AND THE CAM FOLLOWER IS ABOUT 0.3 MM WHEN SETTING
THE CAM FOLLOWER RELEASING ARM ONTO POSITION (B) OF PATTERN
SELECTOR CAM.
6. MOUNT THE FRONT COVER.
0.3 MM
CAM FOLLOWER
CAM FOLLOWER RELEASING ARM
SCREW
CONVEX PART
ZIGZAG CAM
PATTERN SELECTOR CAM
POSITION (A)
POSITION (B)
NOTE: CHECK THE NEEDLE MOVEMENT FOR STRAIGHT STITCH.