Juki NA-11UT Series Sewing Machine User manual
- Type
- User manual
NA-11UT Series
Service manual
CONTENTS
1. JAM･CLEARANCE .................................................................................... 8
1-1. Needle Bar Jam ...................................................................................................... 8
1-2. Thread Take-up Lever Clearance ........................................................................ 10
2. FEED TIME .............................................................................................. 12
2-1. Adjusting the Height of the Feed Dog ................................................................ 12
2-2. The Up/Down Motion Adjusting Shaft Setting ................................................... 14
2-3. The Presser Foot Setting ..................................................................................... 16
2-4. The Feed Cam and Presser Foot Up/Down Motion Cam Setting ..................... 19
2-5. Adjusting the Motion Range of the Feed Dog .................................................... 20
2-6. Adjusting the Balance of the Feed Dog .............................................................. 22
3. THREAD TRIMMING TIME ...................................................................... 23
3-1. The Thread Bar Highest/Lowest Stop Position Setting .................................... 23
3-2. Replacement of the Mes and the Setting ........................................................... 25
3-3. The Thread Retainer Setting ................................................................................ 29
3-4. The Thread Trimming Cam Setting ..................................................................... 30
4. BAD SEWING .......................................................................................... 31
4-1. Hook Time ............................................................................................................. 31
4-2. Placing the Upper Thread .................................................................................... 34
4-3. Adjusting the Tension of the Upper Thread ....................................................... 35
4-4. Adjusting the Tension of the Presser Foot ........................................................ 36
4-5. Adjusting the Tension of the Lower Thread ....................................................... 37
5. NOISE ...................................................................................................... 38
5-1. Upper Shaft Collar Clearance .............................................................................. 38
5-2. Standing Shaft Clearance .................................................................................... 40
5-3. Lower Shaft Clearance ........................................................................................ 42
6. OIL SUPPLY ............................................................................................. 43
6-1. Oil Supply .............................................................................................................. 43
6-2. Adjusting the Oil Supply Volume for the Thread Take-up ................................ 45
6-3. Adjusting the Oil Supply to the Hook ................................................................. 46
7. SOLENOID ............................................................................................... 47
7-1. Thread Trimming Solenoid .................................................................................. 47
8. ADJUSTING THE FORWARD/BACKWARD STITCH LENGTH ............. 49
8-1. Adjusting the Delicate Adjusting Shaft .............................................................. 49
8
01
JAMCLEARANCE
Loosen the screwfor the face plate and disassemble the fact
plate from the arm.
[Fig. 1]
Loosen the fixing screwfor the needle and disassemble the
needle from the needle bar.
[Fig. 2]
Disassemble the needle bar thread guidefrom the needle bar.
[Fig. 3]
Needle Bar Jam
ᶮᔰᵪ䪸പᇊ㷪эĸਾˈ࠶䪸ᵶкⲴ䪸
9
01
JamClearance
Maintenance Book
Loosen the fixing screwfor the needle bar. Move the needle bar
up and down to check the jam.
[Fig. 4]
If the needle bar is stuck, remove the rubber cap of the needle
bar upper bushing.
[Fig. 5]
Disassemble the needle barin the direction of the upper bushing
and replace it with a new SunStar needle bar.
Make the assembly in the reverse order of the disassembly.
[Fig. 6]
10
Loosen the screwfor the face plate and disassemble the face
plate.
[Fig. 1]
Remove the rubber cap from the arm hole. Insert the driver to
loosen the screwfor the thread take-up lever hinge pin by
turning it full circle.
Be cautious not to turn the cutting part of the screw for
the thread take-up lever hinge pin.
[Fig. 2]
Smoothly press the tread take-up lever hinge pinin the direction
of the arm bed and tighten the screwfor the hinge pin.
[Fig. 3]
Thread Take-up Lever Clearance
Slightly move the thread take-upleft and right to check the
clearance.
[Fig. 4]
01
JamClearance
11
Maintenance Book
Manually turn the pulleyto check whether there is no jam and it
operates smoothly.
Make the assembly in the reverse order of the disassembly.
[Fig. 5]
12
02FEED TIME
Turn the dial in the direction of the arrow and set it at the
maximum stitch length.
Max. stitch length:
[Fig. 1]
Lay down the machine and loosen the screwfor the feed lift
shaft crank (ass’y).
[Fig. 2]
Set the heightof the feed at standard 1.2mm when the needle
bar is at the highest point.
[Fig. 3]
Adjusting the Height of the Feed Dog
13
02
Feed Time
Maintenance Book
Tightly tighten the screwfor the feed lift shaft crank (assy).
[Fig. 4]
14
[Fig. 1]
[Fig. 2]
[Fig. 3]
[Fig. 4]
The Up/Down Motion Adjusting Shaft Setting
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02
Feed Time
15
Maintenance Book
[Fig. 5]
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16
The Presser Foot Setting
Turn the presser foot lifter in the direction of the arrow to lift
the presser foot.
[Fig. 1]
Loosen the screw for the main presser foot and disassemble the
presser foot .
[Fig. 2]
Loosen the screw for the presser bar holder. Set the heightof
the auxiliary presser footat mm, and tightly tighten the screw
for the presser bar holder.
[Fig. 3]
Insert the main presser foot and tighten the screwfor presser
foot.
[Fig. 4]
02
Feed Time
17
Maintenance Book
Turn the pulley to set the needle barat the highest point.
[Fig. 5]
Loosen the screw for the auxiliary presser foot up/down motion
crank.
[Fig. 6]
Adjust the heightof the auxiliary presser foot to be 3mm from
the upside face of the needle plate.
[Fig. 7]
Adjust the height of the auxiliary presser foot at 3mm, and tighten
the up/down crank screw.
[Fig. 8]
18
02
Feed Time
19
Maintenance Book
Disassemble the top cover.
[Fig. 1]
[Fig. 2]
[Fig. 3]
The Feed Cam and Presser Foot Up/Down Motion Cam Setting
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[Fig. 4]
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Lift the presser foot by turning the presser bar lifter .
[Fig. 1]
Adjusting the Motion Range of the Feed Dog
20
Turn the dialin the direction of the arrow and set the stitch
length at the maximum level ( mm).
[Fig. 2]
Loosen the screw for the feed dog support base by turning it
full circle.
[Fig. 3]
Manually turn the pulley. When the needle descends and the
center of the thread hole of the needle meets the face of the needle
plate, set the distancebetween the back of the feed and the feed
dog groove at 2mm.
[Fig. 4]
02
Feed Time
21
Maintenance Book
Tighten the screw for the feed dog support crank.
[Fig. 5]
Loosen the fixing screwfor the feed dog support shaft.
[Fig. 1]
22
When the feed dog is at the highest position, turn the feed dog
turning shaftto make the upside face of the feed dog horizontal
with the needle plate.
[Fig. 2]
Adjust the upper faceof the needle plate and the upper face
of the feed dog to be horizontal.
[Fig. 3]
Tighten the fixing screw for the feed dog support shaft.
[Fig. 4]
Adjusting the Balance of the Feed Dog
23
Maintenance Book
03THREAD TRIMMING TIME
Press the switchand check the highest/lowest stop position.
Highest stop position: Press the switch once.
Lowest stop position: Press the switch twice in a row.
[Fig. 1]
When it is moved in the direction of , the stop timing is advanced.
When it is moved in the direction, the stop timing is delayed.
[Fig. ]
The Thread Bar Highest/Lowest Stop Position Setting
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[Fig. ]
The highest stop position of the needle bar should be 1mm
below than the highest pointof the thread take-up lever.
[Fig. ]
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Juki NA-11UT Series Sewing Machine User manual
- Type
- User manual
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