JUKI NA-11UT Top and Bottom Feed Industrial Walking Foot Machine Instruction Manual

18 16)

16

18. Adjusting the trailing length after thread trimming(Fig.16)

O e ·40-70mm O
O Turn the nut CD to adjust the trailing length · At the time of thread trimming. the thread tension mechanism will release and the needle thread _!ension is only applied _by the thread guide CD; · The. standard trai.ling length for the needle thread is 40-70mm; · If increase the thread guide ten$ion, the trailing length will be short; if decrease the thread guide tension, the trailing length will be longer.
1917)

19- Adjusting the thread tension spring {Fig. 17}

17

00 5-Bmm
10

2O

30

40
0.3-0.6N
50 C
6 0 O
3
7O
0

O The standard position of the thread tension sprlng CD is 5-Bmm above the upper surface of the thread guide® when the presser foot® is lowered. 1 Lower the presser foot®; 2.Loosen the screw©; 3.Turn the thread tension bracket@ to adjust the spring position; 4.Tighten the screw©. The standard tension of the spring is 0.3-0.6N. 5.Push the needle thread with your finger until it is slightly higher than the thread tension bracket@ and so that the upper thread is not pulled out; 6.Pull the needle thread down until the spring G) is at the same height with the upper surface of thread guide®, and.then measure the tension of the spring. 7.Insert a screwdriver into the slot of the thread tension stud®, and turn the stud to adjust the tension of the spring CD. Note: If using a tension gauge CD to measure the tension, take the reading from the scale on the side of the red line

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/

1

1

40-70mm

·

·

·
I-1

0 3 ~ 06N

mcrease

decrease

19

8mm

|2018)
2g0u.idAed(jFuisgt.in18g)the upper thread O
O 3

The standard position of upper thread guide CD is where the screw® is in the center bf the adjustable range of upper thread guide. To adjust the position, loosen the screw@ and move the thread guide. If stitch the heavy materials, move the thread guide leftward. (To increase the thread take-up tension) If stitch the light materials, move the thread guide rightward. (To decrease the thread take-up tension)
|2119)
2i. Adjusting the preser foot hei9ht (Fig. 19)
O8mm
1 O
28mm
o 30
4 The standard height of presser foot is 8mm when it is lifted by hand. 1.Loosen the screw® to lift the presser bar 2.Put a measurement gauge with 8mm height under the presser foot; 3.Loosen the screw© and adjust the height of presser foot; 4.Tighten the screw@.

20

20. 22. Adjusting the feed dog height (Fig. 20)
    11.2mm 20
    1.Set the stitch length maximum, when the feed dog (j) is at its highest position above the needle plate, the standad height is 1.2mm 2.Loo_sen the screw® and turn the feed lifting arm @to adjust the height of feed dog.

-1O-

2321. 2(F3i.gA. d21ju)sting the feed dog angle
      O 1 20 390 °

A) B) 40 The standard angle of the feed dog is: when the feed dog is at its highest position above the needle plate. the Mark on the feed bracket shaft is on the horizontal position. i1t.sThuirgnhtehsetmpoascihtiionne; pulley to lift the feed dog to 23..LTouornsethnethfeeesdcbrerawcCkDe;t shaft in the direction of the arrow within a range of 90 with respect to the standard angle position.

• In order to prevent puckering. lower the front
  of the feed dog (Fig. A)
• In order to keep the materials straight, raise
  the front of the feed dog (Fig. B) 4.Securely tighten the set screw CD. It’s necessary to adjust the feed dog height a gain after this adjustment.

[ 2422)

24. Adjusting the difference of stitch length between the forward and backtacking (Fig.22)
1
200
30 1.Remove the rear cover;
2.Loosen the screw CD and turn the connecting
stud® Turn the stud® clockwise, the forward stitch length will be longer and the backtacking stitch length will be shorter; Turn the stud® counterclockwise, the forward stitch length will be shorter and the backtacking stitch length will be longer;
3.Tighten the screw CD.

I 2523)

25. Adjusting the tension release {Fig. 23)

0

The opening time of the thread tension discs

can be adjusted.

Remove the rubb’er cap on the rear of arm, and

tt,irn the screw CD, then the thread relea,se cam

® can be moved left or right.

Move the cam rightward, the release time will be

slow Move

the

cam

leftward,

the

release

time

will

be

quick.

-l l-

/ 9

St ard

— Lowmethe front
A) (Fig. A)
k B) (Fig. B) Raisethefront

22

23
L

24

Needle timing advanced

Standard

Needle !!ming retarded

25

[2624)
26.Adjusting the timing of needle and feed mechanism (Fig. 24)

O
0 O

1
2
0 0
0
3 O
O 0
0 4
g O

g
5
T he standard timing is when the feed dog is lowered from its highest position until it is flush with the top of the needle plate ®, and the needle eye@ is also aligned horizontally with the surface. Adjust by changing the phases of feed cam and eccentric wheel UD 1.Remove the rear cover 2.Turn the machine pulley in reverse direction, set the second screw@ on the gear of upper shaft as reference mark, make the third screw ® of eccentric wheel UD slightly lower than the reference mark screw@; 3.Continue to turn the machine pulley, set the second screw® of eccentric wheel UD as reference mark, make the third screw (i) of feed cam slightly higher than the reference mark screw@. 4.lf need a non-timing position, loosen the three screws of eccentric wheel UD, adjust the eccentric cam@in the direction of arrow (A) or (B) To increase the tension of thread, turn the eccentric cam@to direction (A) To avoid the needle bent, turn the eccentric cam @ to direction (B) 5.After adjustment, tighten all of the screws.

Small Big

(

[2725)
27. Adjusting the rotary hook lubrication amount {Fig. 25)
0 Tilt back the machine head, and turn the oil
adjustment screw CD to adust the hook oiling
amount.

-12-

| 2826)
28. Adjusting the height of needle bar and the timing with hook (Fig. 26)
O 0
1
20
o 3 0
40
50
0 O
O
O0
1O

2.4mm
1.3-1.Bmm
2 O 0
0.05mm
3O
When the needle bar CD is at its lowest position, the top reference line (A) on the needle bi;ir should be aligned with the bottom edge of the needle bar bush®· 1.Turn the machin.e pulley to lower the needle bar to its lowest position; 2.Take out the rubber cap@; 3.Loosen the screw©. and move the needle bar CD to proper position; 4.Tighten the screw©; 5.Close the rubber cap®·
Lift the needle bar CD from the lowest position, when the second reference line (B) on the needle bar is aligned with the bottom edge of the needle bar bush®· the tip@ of the hook should be aimed at the center of needle®· 1 Turn the machine pulley to raise the needle bar CD from its lowest position until the reference line (B) is aligned with the bottom edge of the needle bar bush® *When the needle bar moves up2.4mm, the clearance between the upper of needle hole and
crJ. ttie hook tip should be 1.3-1.8mm
2.Loosen the screw and make the hook tip aimed at the center of needle®, the clearance between the hook tip and needle should be 0.05mm 3.Tighten the screw c:JJ.

B 0.05mm

| 2927)
| 29. Adjustingthe oil pump (Fig. 27)
0 L@ If the oil is not circled observed from the oil gauge window at a lower sewing speed, turn the
CD oil adjustment plate to cover the oil hole®.

0.5 -1.0mm

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26
1 3~1.8mm
–L
|
1
2.4mm
27

28
Needle plate
0
Upward Downward

I3028)1

p3r0e- sAsdejur sfetientg(Fthige.

lifting 28)

amount

of

1

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C
O

2.Adjusting the lifting amount of presser feet Adjust the lifting amount of two feet to match the materials to be sewn. Loosen the screw@. and move the screw upward to increase the lifting amount or move the screw downward to decrease the lifting amount. 3

C (3mm
O 3.Adjusting the forward/backward clearance of the two feet To keep the front groove of walking foot not strike the rear of the presser foot, the clearance of C must be kept about 3mm. Loosen the screw of feed arm R, and then turn the feed rock shaft@ to adjust.

4A

1 : 1 (

0Oc
LL,
4.Adjusting the feed amount of walking foot (Fig. A) *The standard ration of feed amount between feed dog and walking foot is 1 :1 The feed amount of walking foot can be adjusted to suit for the materials to be sewn. Loosen the nut (J), and move the slide block@ Upward: decrease the distance L to make the feed amount be smaller Downward: increase the distance L to make the feed amount be larger

-14-

31Adjusting the trimming mechanism

l’ 29) 1.Trimming mechanism (Fig. 29)

Holder, F-knife

Spring

Solenoid

29

Holder, M-knife

Fixed knife-

1

/ Thread tri mmer caml evershaft

Movable knife

Driven crank

1 1 Cam !eve,L

2Camlever2, R

..,,,
Driven plate

Pos

ioning

Spring block

Stopper plate

2 30)
(1)12)0.3mm
(2)
(3) 2,The elation between fixed knife and movable knife (Fig.30) (1)Thecleaance between fixed knife CD and movable knife® should be 0.3mm (2)Adjust the position illustrated by the Fig. 35 (3)Move the bobbin case opener and adjust the holde of fixed knife.

30
A

3 31)
1 (1)
(2)1
1
i (3)f 2
3. Thread trimmer cam lever shaft (Fig. 31)
(1)Install the shaft CD on the machine bed first; (2)lnstall the cam lever Lon the shaft CD as illustrated; (3)Slightly turn the shaft CD, and install the positioning block® as illustrated.

1 Camlever, L

13 l

Spring

1

2 2 Cam lever, R

87.5rrrn

j
‘
1f ` )

-15-

33

l

o

C D

4 32)
(1) a6.0mm bAc (2) a BC B 121mm
c 32 0.5mm — 26
4.lnstalling the trimming solenoid (Fig. 32) (1)The stoke of solenoid a. The standard stroke is 6.0mm b. Turn the nut (A) to adjust the stroke (2)1nstalling the solenoid a.Fixed the solenoid by the screws Band C; b. Be sure to keep the clearance between the driven plate CD and cam lever R ® 1 mm; c. When the solenoid is active, there should be a 0.5mm clearance between the cam lever L @ and cam lever R ®· If need to adjust, please move the solenoid base shown by the arrow.
5 33)
(1)
(2)1
(3) 2 0.51.0mm 5.lnstalling the trimming cam (Fig. 33)
(1) When theoystick is at the lowest point
(2)Set the solenoid active and turn the trimming cam CD until the cam is touched with the roller, then fix the cam; (3)Set the solenoid inactive and make the cam lever® restore to the original position, there should be a 0.5-t.Omm clearance between cam and roller.

-l6-

– –

r :”

-“~`

–

~ ~-

B

— – 7 -,

ifj

.,=

/
-.~-
Orivom mk

A

3

t I

Ili ‘, 4l,1,I

J (C1}
1 7.5mm, mm 1 1 1.5 L : BA ~
6.Adjula>ting the knive (Fig (1)The relation between fixed knife and movable knife Thclearance between movable knife CD and needle nteris 7.5mm, and th cl aranc between fixed knife ® and needle c, nter is 5mm. {2)Set th soienoid activo, tho movblo knife G) will turn rightward driven by the trimming c m. When the movable knife (D mov s to jt Jeft furthest position, the clearance between two knives CD and® should b1,5-20mm A{3. If tdhjeusthtlrnegatdheMtmrimmm inginngostoslemnoooitdhly, spedally the thick thread used. Just ned to increase the trimming pressure: B.AdJustrng the trimming pressure: looen the nut B, adjust the srew A to get throasonab pre sure

-17-

| 1 32 35) 38.Clean(Fig. 35)
1 2O 3 4O 1.Raise the presser foot; 2.Remove the two screws CD and needle plate®; 3.Clean the feed dog with a soft brush; 4.lnstall the needle plate® by two screws CD. 5
· 0 5.Turn the machine pulley slowly and check if the needle dops into the hole cente of needle plate *If not 8Check if the needle is bent 8Loosen the screw (D, and einstall the needle plate®
6
7
80 9
10 11 12(A) 6.Turn the machine pulley and lift the needle above the needle plate, check if the needle tip is blunt, if yes, change a new one. 7.Tilt back the machine head 8.Remove the bobbin case@ 9.Clean the hook with a soft cloth and check if the hook is worn out 1O.Take out the bobbin from the bobbin case, and clean the bobbin case with a soft cloth 11.lnsert the bobbin into the bobbin case and place the bobbin case back into the machine 12.Clean the dust on the filter (A) of oil pump.
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35

\ , I

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