JANOME MyLock 634D Servicing Manual

SERVICING

MANUAL

MODEL 634D

INDEX

TO CHANGE

FACE PLATE UNIT ............................................................................................................1

TOP COVER UNIT ............................................................................................................ 2

BELT COVER UNIT ........................................................................................................... 3

TENSION COVER UNIT .................................................................................................... 4

FRONT PANEL UNIT .........................................................................................................5

SIDE COVER UNIT ...........................................................................................................6

MACHINE BASE.................................................................................................................7

MACHINE SOCKET........................................................................................................... 8

TO ADJUST

NEEDLE BAR HEIGHT......................................................................................................9

PRESSER BAR HEIGHT................................................................................................. 10

FEED DOG HEIGHT ....................................................................................................... 11

TIMING OF NEEDLE AND FEED DOG ........................................................................... 12

TENSION OF SUB THREAD TENSION DIAL ................................................................. 13

NEEDLE AND THE UPPER KNIFE TIMING ....................................................................14

STITCH LENGTH............................................................................................................. 15

CLEARANCE BETWEEN NEEDLE AND LOWER LOOPER / NEEDLE GUARDS ......16

CLEARANCE BETWEEN NEEDLE•@AND FIXED NEEDLE GUARD ............................ 17

POSITION OF CHAINING FINGER ..................................................................................18

NEEDLE AND THE LOWER LOOPER TIMING .............................................................. 19

POSITION OF UPPER LOOPER....................................................................................20

UPPER & LOWER LOOPER TIMING ............................................................................. 21

CLEARANCE BETWEEN LOOPERS.............................................................................22

CLEARANCE BETWEEN NEEDLE•@AND UPPER LOOPER.......................................23

POSITION OF KNIVES.................................................................................................... 24

POSITION OF LOWER LOOPER THREAD GUIDE ...................................................... 25

THREAD TENTION DIAL................................................................................................. 26

TO CHANGE THE TOP COVER UNIT

To remove:

1. Loosen two screws (A) through hole of tension thread guide plate (B), and remove the top

cover (C).

To attach:

2. Put the ribs (D) in tension cover unit (E), and tighten the setscrews (A).

TO CHANGE THE BELT COVER UNIT

To remove:

1.Open the looper cover unit (A).

2.Loosen set screw (B) and remove the setscrew (C).

3.Remove the belt cover unit (D).

To attach:

4.Put the ribs (E & F) in front panel unit (G) and tension cover unit (H), and tighten setscrews (B

& C).

TO CHANGE THE TENSION COVER UNIT

To remove:

1. Remove face plate unit and belt cover unit.

2. Remove setscrews (A & B), and remove tension cover unit (C).

To attach:

3. Put rib (D) in front panel unit (E), and tighten the setscrews (A & B).

4. Attached the belt cover unit and face plate unit.

TO CHANGE THE FRONT PANEL UNIT

To remove:

1. Remove the face plate unit, belt cover unit and tension cover unit.

2. Move the upper looper (F) to its lowest position by turning the balance wheel in counterclock-

wise.

3. Remove set screws (A, B, C, D & E), and remove the front panel unit (G).

To attach:

4. Attach the front panel unit (G), and tighten setscrews (A, B, C, D & E).

To set the thread take-up lever position, the thread take-up lever (H) and the thread take-up

lever cover (I) should be set at F position as shown below.

5. Attach the tension cover unit, belt cover unit and face plate unit.

TO CHANGE THE SIDE COVER UNIT

To remove:

1. Loosen setscrew (A) and remove the side cover unit (B).

To attach:

2. Fit the U-groove (C) in the side cover unit (B) between the setscrew (A) and set plate (D).

3. Tighten the setscrew (A).

TO CHANGE THE MACHINE BASE

To remove:

1.Remove the screws (A, B, C, D & two hinge screws E), and remove the base cushions (F).

2.Remove the machine base (G).

To attach:

3.Attach the machine base (G), and tighten the screws (A, B, C & D).

4.Attach the base cushions (F), washers (H, I & J), and tighten the hinge screws (E).

(Do not cross the washers because the sizes are different.)

TO CHANGE THE MACHINE SOCKET

To remove:

1.Remove the belt cover.

2.Remove the two setscrews (G), and pull out the cord connectors (A, B, C & D).

To attach:

3.Insert the cord connectors (A, B, C & D) as shown below.

Connectors:

A: Blue for motor

B: Brown for motor

C: Brown for lamp socket

D: Blue for lamp socket

4.Attach the machine socket (F), and tighten the two screws (G).

5.Attach the belt cover unit.

TO ADJUST THE NEEDLE BAR HEIGHT

The distance between the tip of needle on the right and the surface of needle plate (B) should be

between 11.2 and 11 .6 mm when the needle bar (C) is at the highest position.

To adjust:

1. Remove the face plate unit.

2. Turn the balance wheel toward you with your hand, and set the needle bar (C) at the highest

position.

3. Loosen the setscrew (A) to adjust the height, and tighten, the setscrew (A) after the adjust-

ment is done.

4. Turn the balance wheel toward you one cycle, and recheck the needle bar height.

5. Attach the face plate unit.

TO ADJUST THE PRESSER BAR HEIGHT

The distance between the surface of needle plate (C) and bottom of presser foot should be

between 4.7 and 5.3 mm (47/254 and 53/254”) when the presser bar lifter (D) is raised.

To adjust:

1. Remove the face plate unit.

2. Remove the set screws (A) to move the lamp socket unit (E).

3. Raise the presser bar lifter (D), and loosen the setscrew (B).

Then adjust the presser bar height. The side of presser foot should be paralleled (F) with the

hole of needle plate.

4. Tighten the setscrew (B).

5. Tighten the setscrew (A).

6. Attach the face plate unit.

TO ADJUST THE FEED DOG HEIGHT

When the presser foot is lowered and the feed dogs•iA •• B•jare at their highest position, the

distance between the surface of needle plate (C) and bottom of presser foot should be between

0.75 and 0.95 mm.

To adjust:

1.Set the stitch length dial at “3” and the differential feed dial at “1 .0”.

2.Lower the presser foot and raise the feed dogs (A & B) to their highest position by turning the

balance wheel.

3.Loosen the 4 main & sub feed dog screws (D).

4.Push the main feed dog straight upward (E) and adjust the distance between the surface of

needle plate and bottom of presser foot, then tighten the setscrews (2 screws).

5.When the top of the main feed dog is at the level of the top surface of needle plate in its down-

ward motion by turning the balance wheel, loosen the 2 setscrews for sub feed dog (B), and

push the sub feed dog straight upward (F) until its top surface is leveled (G) to the top surface

of needle plate (C). Then tighten the 2 setscrews of sub feed dog (B).

6.Check if these feed dogs are in parallel with the surface of needle plate while turning the

balance wheel.

110

TIMING OF NEEDLE AND FEED DOG

When the tip of right needle is at 2 mm (J) above the needle plate in its downward motion, and

lowered presser foot, the top of the feed dog teeth (K) should be leveled with the top surface of

needle plate (L) at the end of feed movement (M).

To adjust:

1. Remove the machine base.

2. Loosen set screw (A) and remove setscrew (B). Remove feed base cover (N).

3. Loosen set screw (C) and remove balance weight (O). Loosen setscrew (D) and remove

knife cam (P). Loosen setscrew (E) and remove link pin (Q) and upper knife rod (R).

4. Set feed regulator dial at 3.0, differential dial at 1.0.

5. Raise the presser foot and move the tip of right needle to 2 mm (J) above the needle plate in

its downward motion by turning the balance wheel.

6. Lower the presser foot, and loose the two screws (F) and adjust the position of the feed cam

(S) while aiming the guide line (T).

* Turn the feed cam to the direction G if the feed dogs are lower than the surface of the

needle plate.

* Turn the feed cam to the direction H if the feed dogs are higher than the surface of the

needle plate.

7. Loosen the two screws (I). Turn the balance wheel to bring the 2.5mm hole (U) of sub feed

cam (V) in front position. Put the guide pin (W) through the sub feed to main feed cam.

Tighten the setscrews (I). Clearance between main feed cam and bushing should be 1 mm

(X).

8. Attach the link pin (Q) through the upper knife rod (R), and attach the balance weight (O) and

knife cam (P) to main shaft. Then set them in line with the guide line and tighten the set-

screws (C) and (D).

9. Attach the feed base cover and machine base.

TO ADJUST THE TENSION OF SUB THREAD TENSION DIAL

After adjustment of the thread tension for 4 thread overlock sewing, slide the slide lever (C) from

“STD” position to “ R. H.” position without turning the thread tension dials. Make sure the sliding

thread guide (D) is set at “3/4” position.

Set the chainning-off finger position is set at “R” position and remove the left needle and thread

and adjust the sub thread tension dial as follows.

1.When the lower looper thread tension is loose, turn the adjusting screw (E) to the direction of

(A).

2.When the lower looper thread tension is tight, turn the adjusting screw to the direction of (B).

Note: If the tension cannot be set correctly within two turns of the adjusting screw, do not turn the

adjusting screw. It may require to make an adjustment on the other part of mechanism.

TO ADJUST THE NEEDLE AND THE UPPER KNIFE TIMING

When the needle bar is at its highest position the upper knife should be also at its highest posi-

tion.

To adjust:

1.Remove the feed base cover.

2.Loosen the two setscrews (A) and remove the balance weight (F).

3.Loosen the two setscrews (B), and adjust the needle and upper knife timing.

* Turn the upper knife drive cam (G) to the direction of (D) when the upper knife timing is

delayed.

* Turn the upper knife drive cam (G) to the direction of (E) when the upper knife timing is

advanced.

4.Tighten the two setscrews (B) firmly. Attach the balance weight (F) and set to guide line (C)

on the balance weight is in line with the one on main shaft and tighten two set screws (A).

5.Turn the balance wheel toward you one cycle, and recheck the needle and the upper knife

timing.

6.Attach the feed base cover.

TO ADJUST THE STITCH LENGTH

The actual stitch length should be 2.8 to 3.0 mm when the stitch dial is set at “3”.

To adjust:

1. Set the stitch length dial (C) at “3” and the differential feed dial (D) at “1.0”.

2. Remove the face plate unit, belt cover unit, tension cover unit and front panel unit.

3. If the actual stitch length is larger than 3.0 mm, turn the adjusting screw (E) in the direction of

(A). If the actual stitch length is shorter than 2.8 mm, turn the adjusting screw (E) in the

direction of (B).

4. Attach the front panel unit, tension cover unit, belt cover unit and face plate unit.

TO ADJUST THE CLEARANCE BETWEEN EEDLE

AND LOWER LOOPER I NEEDLE GUARDS

When the tip of lower looper (G) comes from the left just behind the needle (I) on the left or right,

the clearance between both needles and lower looper (G) should be between 0 and 0.1 mm. In

this condition, the clearance between both needles and rear needle guard (H) should be between

0 and 0.2 mm.

To adjust:

1. Remove the presser foot and needle plate. Loosen screws (A) and (B) and move the front

needle guard (J) and rear needle guard (H) to get clearance between needle guards and

needle.

2. Turn the balance wheel toward you with your hand to bring the tip of looper just behind the

needle (I) on the right from the left.

3. Loose hexagon bolt (B) just enough to move lower looper driving arm (K), and move it to back

or front to get the proper clearance between lower looper (G) and needle on the right (should

be 0.1 - 0.2 mm).

4. To adjust the clearance between needle on the left and lower looper (G), loosen the screw (D)

and move the needle bar to the direction of (E) or (F) to get proper clearance between both

needle and lower looper (G). Be careful not to change the needle bar height.

5. Recheck the clearance between the needle on the right and lower looper.

Clearance between the needle and rear needle guard:

6. Bring the rear needle guard (H) to the front to set the clearance between the needle (I) and

rear needle guard (H) to 0.1 - 0.3 mm. Then tighten the two setscrews (C).

Clearance between the lower looper and needle:

7. Turn the balance wheel toward you to until the tip of lower looper comes just behind the

center of needle from left. Push the front needle guard (J) against the needle (I) to adjust the

clearance between the needle and lower looper (G). The clearance between needle (I) and

the tip of lower looper (G) should be 0 to 0.1 mm. In this condition, the clearance between the

needle (I) and rear needle guard (H) should be 0 to 0.2 mm. Tighten the two setscrews (A).

8. Check the lower looper (G) position.

9. Check the clearance between the needle (I) and lower looper (G).

10.Check the clearance between lower and upper loopers.

11. Attach the needle plate and presser foot.

TO ADJUST THE CLEARANCE BETWEEN NEEDLES

AND FIXED NEEDLE GUARD

The clearance between needle (B) and the fixed needle guard (C) should be 0.1 to 0.4 mm (D).

To adjust:

1.Remove the foot and the needle plate and lower the needle to its lowest position.

2.Loosen the setscrew (A) and adjust the position of the fixed needle guard (C).

When needle position setting knob is set at “S”, the fixed needle guard (C) should touch (F)

the chaining-off finger (E) as shown below

3.Tighten the setscrew (A).

4. Attach the needle plate and the foot.

TO ADJUST THE POSITION OF CHAINING-OFF FINGER

When set the needle plate stung knob (E) at guide line “S”, chaining-off finger (B) should touch

with the side of needle plate (C) and tip of chaining-off finger should be at the same level as the

tip pin of the needle plate (D).

To adjust:

1.Remove the presser foot.

2.Set the needle plate setting knob (E) at the guide line (S) on needle plate.

3.Loosen 2 setscrews (A), and move chaining-off finger unit (B) to correct position.

4.Tighten 2 setscrews (A).

5.Set the needle plate setting knob (E) at the guide line (S) and (R) on needle plate and check

the position of chaining-off finger unit (B).

6.Attach the presser foot

TO ADJUST THE NEEDLE AND THE LOWER LOOPER TIMING

When the needle comes up 1.4 to 1.8 mm (A) from its lowest position, the tip of lower looper (B)

comes just to left side of left needle (C) on the left.

To adjust:

1. Remove the presser foot and the needle plate.

2. Turn the balance wheel toward you with your hand to bring the needle (C) 1.4 to 1 .8 mm from

its lowest position. Loosen the hexagon bolt (D) just enough to move the lower looper driving

arm (E), and move it until the tip of lower looper (B) comes just to left side of needle on the left

(C).

3. Tighten the hexagon bolt (D). Check if timing of the needle and lower looper is correct. Check

the clearance between the needle and lower looper needle guards.

4. Attach the presser foot and the needle plate.

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JANOME MyLock 634D Servicing Manual

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