JUKI LBH-1790AN User manual

LBH-1790AN,1795AN
INSTRUCTION MANUAL

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CONTENTS
I. IMPORTANT SAFETY INSTRUCTIONS ..................................................... 1
II. SPECIFICATIONS....................................................................................... 1
1. Specications.........................................................................................................................2
2. Standard sewing shape list...................................................................................................3
3. Conguration .........................................................................................................................4
III. INSTALLATION.......................................................................................... 5
IV. PREPARATION BEFORE OPERATION.................................................. 15
1. Lubrication ...........................................................................................................................15
2. Inserting the needle .............................................................................................................16
3. Threading the needle-thread...............................................................................................17
4. Threading the bobbin case .................................................................................................17
5. Adjusting the bobbin thread tension .................................................................................18
6. Installation of bobbin case..................................................................................................18
7. Installing the knife ...............................................................................................................19
8. Checking the sewing machine in the delivered state....................................................... 19
V. OPERATION OF THE SEWING MACHINE.............................................. 20
1. Explanation of the operation panel switch........................................................................ 20
2. Basic operation of the sewing machine ............................................................................22
3. How to use the pedal ...........................................................................................................24
4. Input of the presser type .....................................................................................................26
5. Performing pattern selection ..............................................................................................27
6. Changing needle thread tension ........................................................................................28
7. Performing re-sewing ..........................................................................................................29
8. Winding bobbin thread........................................................................................................30
9. Using the counter ................................................................................................................31
10. Using the initial value pattern...........................................................................................33
11. Changing sewing data.......................................................................................................34
12. Method of setting sewing data with/without edit ............................................................36
13. Sewing data list..................................................................................................................37
14. Copying sewing pattern ....................................................................................................43
15. How to edit/check the data other than sewing data .......................................................44
16. Using parameter register key ...........................................................................................46
17. Performing continuous stitching .....................................................................................47
18. Performing cycle stitching................................................................................................50
19. How to change the name of cycle/continuous sewing data ..........................................52
20. Explanation of plural motions of knife.............................................................................53
21. Method of changing memory switch data .......................................................................54
22. Memory switch data list ....................................................................................................55
23. How to change the sewing speed while the sewing machine is engaged in sewing ......... 59
24. How to adjust the pedal variable resistor........................................................................60

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25. How to adjust the contrast................................................................................................61
26. How to set the key lock .....................................................................................................61
27. Communication..................................................................................................................62
28. Setting the irregular work .................................................................................................66
VI. MAINTENANCE....................................................................................... 68
1. Adjusting the needle-to-hook relation ...............................................................................68
2. Adjusting the needle thread trimmer .................................................................................69
3. Adjusting the presser bar pressure ...................................................................................70
4. Adjustment of the bobbin presser unit..............................................................................70
5. Thread tension .....................................................................................................................71
6. Replacing the fuse ...............................................................................................................72
VII. GAUGE COMPONENTS ........................................................................ 73
1. Cloth cutting knife ...............................................................................................................73
2. Throat plate ..........................................................................................................................73
3. Presser..................................................................................................................................73
VIII. ERROR CODE LIST.............................................................................. 74
1. How to operate the sewing machine in the case an error is displayed.......................... 74
2. Operation procedure to be followed when a message is displayed............................... 80
IX. TROUBLES AND CORRECTIVE MEASURES....................................... 81
X. DRAWING OF THE TABLE...................................................................... 83
XI. INITIAL VALUE DATA FOR EACH SHAPE TABLE ............................... 85

– 1 –
I. IMPORTANT SAFETY INSTRUCTIONS
II. SPECIFICATIONS
Main specications of the LBH-1790AN, LBH-1795AN computer-controlled, lockstitch buttonholing machine.
1) Never operate the machine unless the oiling tank has been properly lubricated.
2) After the completion of a day's work, remove dust and dirt accumulating on the hook, bobbin thread
trimming knife section and lubricating hole of the oil tank. At this time, also check whether or not the oil
quantity is adequate.
3) Be sure to return the starting pedal to the home position after the machine has started to run.
4) This machine is provided with a machine head tilt detector so that it cannot be operated in the state
that the machine head is tilted. When operating this sewing machine, turn the power switch ON after
setting the sewing machine to the bed base properly.
Subclass S
Major application Buttonholing of cloth such as men’s shirts, blouses,
work uniforms, ladies' wear, etc.
Buttonholing size
Knife size used :
6.4 to 31.8 mm (1/4' to 1-1/4')
Buttonholing sewing length
Standard : Max. 41 mm
Special type part : Max. 120 mm
Standard : Max. 5 mm
Special type part : Max. 10 mm

– 2 –
1. Specications
Sewing speed Standard speed : 3,600 sti/min (Max. : 4,200 sti/min) (Max. : 3,300 sti/
min when dry hook is used)
Needle DP × 5 #11J to #14J
Hook DP type full-rotary hook
Needle rocking drive method Drive by stepping motor
Feed drive method Drive by stepping motor
Presser lifting drive method Drive by stepping motor
Lift of presser foot 14 mm (Optional setting available) Max. : 17 mm (At the time of nee-
dle up by reverse run)
Cloth cutting knife drive method Motor-driven crank system
Standard sewing shape 31 kinds
Number of patterns stored in
memory
99 patterns
Mass Machine head 55 kg, Control box 5.5 kg
Power consumption 370 VA
Operating temperature range 5 ˚C to 35 ˚C
Operating humidity range 35% to 85% (No dew condensation)
Line voltage Rated voltage ± 10% 50/60 Hz
Motor used 3-phase 200 to 240 V, 370 VA
Noise - Equivalent continuous emission sound pressure level (LpA) at the
workstation :
A-weighted value of 81.0 dB ; (Includes ; KpA = 2.5 dB) ; according
to ISO 10821- C.6.3 -ISO 11204 GR2 at 3,600 sti/min.