Juki LH-4128-7 Handleiding
Juki
Naaimachine
LH-4128-7
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Pagina 1/48
ENGLISH
LH-4128, 4128-7
LH-4168-7, 4188-7
INSTRUCTION MANUAL
i
CONTENTS
1. SPECIFICATIONS ........................................................................................................... 1
2. NAME OF EACH COMPONENT .................................................................................... 2
3. INSTALLATION ............................................................................................................... 3
3-1. Installing the bottom cover .................................................................................................................................. 3
3-2. Opening and closing of the control box (SC-910) ............................................................................................. 4
3-3. Adjusting the height of the knee lifter ................................................................................................................ 5
3-4. Installation of thread stand .................................................................................................................................. 5
3-5. Caution when installing the panel ...................................................................................................................... 5
3-6. Connecting the cord ............................................................................................................................................. 6
3-7. Managing the cord ................................................................................................................................................ 8
3-8. Adjusting the knee lifter detection seat (asm.) ................................................................................................10
4. PREPARATION OF THE SEWING MACHINE ............................................................. 11
4-1. Lubrication .......................................................................................................................................................... 11
4-2. Cleaning the lter ............................................................................................................................................... 12
4-3. Adjusting the amount of oil in the hook .......................................................................................................... 13
4-4. Attaching the needles ........................................................................................................................................ 13
4-5. How to take out the bobbin case ...................................................................................................................... 14
4-6. Inserting a bobbin in a bobbin case ................................................................................................................. 14
4-7. Threading the machine head ............................................................................................................................. 15
4-8. Thread tension .................................................................................................................................................... 16
4-9. Thread take-up spring ........................................................................................................................................ 16
4-10. Adjusting the stitch length .............................................................................................................................. 17
4-11. Winding the bobbin thread .............................................................................................................................. 18
4-12. Adjusting the needle stop position ................................................................................................................. 19
4-13. Pedal pressure and pedal stroke .................................................................................................................... 20
4-14. Adjustment of the pedal ................................................................................................................................... 20
5. OPARATION OF THE SEWING MACHINE .................................................................. 21
5-1. Pedal operation ................................................................................................................................................... 21
5-2. Hand lifter ............................................................................................................................................................ 22
5-3. Adjusting the pressure of the presser foot ...................................................................................................... 22
5-4. Thread tension release changeover when using the knee lifter .................................................................... 23
5-5. Separately driven needle changeover switch (for LH-4168-7 and 4188-7) .................................................... 24
5-6. One-touch reverse feed switch lever (for touch-back) ................................................................................... 25
6. MAINTENANCE ............................................................................................................ 25
6-1. Changing procedure to bottom feed and the adjustment (LH-4128 without thread trimmer only)............. 25
6-2. Changing procedure to needle feed (for LH-4128 only) ................................................................................. 27
6-3. Adjusting the inner hook guide ......................................................................................................................... 28
6-4. Needle-to-hook relation ..................................................................................................................................... 29
6-5. Adjusting the height and the inclination of the feed dog ............................................................................... 32
6-6. Adjusting the presser foot ................................................................................................................................. 32
6-7. Move (adjustment) of the hook shaft saddle when replacing the gauge ...................................................... 33
6-8. Adjusting the thread presser spring ................................................................................................................. 33
6-9. Adjusting the position of the moving knife ...................................................................................................... 34
6-10. Replacing the bobbin thread slack preventer spring (for LH-4168-7 and 4188-7) ...................................... 35
6-11. Adjusting the hook needle guard .................................................................................................................... 35
6-12. Stop of the needle bars and angle of corners for corners stitching (for LH-4168-7 and 4188-7) ............... 36
6-13. Caution when installing the gauge to the bed slide ...................................................................................... 36
6-14. Position of the wiper ........................................................................................................................................ 37
6-15. Replenishing grease to the specied places (for LH-4168-7 and 4188-7) ................................................... 37
6-16. Cleaning the inside of the needle bar bushing .............................................................................................. 39
7.
STITCH-TO-ANGLE TABLE BY GAUGE (PITCH AND mm CONVERSION TABLE)
... 40
8. GAUGE SETS ............................................................................................................... 41
9. TROUBLES AND CORRECTIVE MEASURES ............................................................ 46
– 1 –
1. SPECIFICATIONS
*1 3,500 sti/min when the stitch length exceeds 4 mm.
*2 S : Standard, F : Foundation, G : Jeans
Model name LH-4128
LH-4128-7
(with automatic
thread trimmer)
LH-4168-7
(with automatic
thread trimmer
incorporating corner
stitching)
LH-4188-7
(with automatic
thread trimmer
incorporating corner
stitching)
Application For light-, medium-
and heavy-weight materials
For medium- and
heavy-weight
materials
Specication type *2 S, F, G S, G G
Hook Standard hook Large hook
Thread trimmer Not provided Provided
Separately
driven needle bar
mechanism
Not provided Provided
Max. sewing speed 4,000 sti/min *13,200 sti/min
Needle DP x 5 #9 to #16 (For S type), DP x 5 #9 to #11 (For F type), DP x 5 #16 to #22 (G type)
Gauge size 1/8" to 1-1/2"
3.2 to 38.1 mm
5/32" to 1-1/4"
4 to 31.8 mm
5/32" to 1"
4 to 25.4 mm
5/32" to 1"
4 to 25.4 mm
Lift of presser foot 12 mm by knee lifter, 5.5 mm by hand lifter lever, 9 mm by knee lifter with wiper
Lubrication New Defrix Oil No. 1
Noise
• LH-4128 / 4128-7
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 83.5 dB ; (Includes K
pA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 4000 sti/min.
- Sound power level (LWA);
A-weighted value of 88.0 dB ; (Includes K
WA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
3744 GR2 at 4000 sti/min.
• LH-4168-7
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 78.0 dB ; (Includes K
pA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 3200 sti/min.
• LH-4188-7
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 84.5 dB ; (Includes K
pA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 3200 sti/min.
- Sound power level (LWA) ;
A-weighted value of 89.0 dB ; (Includes K
WA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
3744 GR2 at 3200 sti/min.
Product specificaties
| Merk: | Juki |
| Categorie: | Naaimachine |
| Model: | LH-4128-7 |
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