JUKI LS-2342 User manual

LS-2342, 2342-7
INSTRUCTION MANUAL

i
CONTENTS
1. SPECIFICATIONS............................................................................................................ 1
2. INSTALLATION................................................................................................................ 3
2-1. Attaching the drain container ............................................................................................................ 3
2-2. Installation of the sewing machine.................................................................................................... 3
2-3. Pneumatic components...................................................................................................................... 5
2-4. Installing the thread stand ................................................................................................................. 6
3. PREPARATION OF THE SEWING MACHINE ................................................................ 7
3-1. Lubrication...........................................................................................................................................7
3-2. Attaching the needle ........................................................................................................................... 8
3-3. Attaching and removing the bobbin.................................................................................................. 8
3-4. Threading the hook............................................................................................................................. 9
3-5. Winding a bobbin ................................................................................................................................ 9
3-6. Threading the machine head ........................................................................................................... 10
3-7. How to set the model of the machine head .................................................................................... 11
3-8. Adjusting the machine head ............................................................................................................ 12
4. ADJUSTING THE SEWING MACHINE ......................................................................... 14
4-1. Adjusting the stitch length ............................................................................................................... 14
4-2. Thread tension ..................................................................................................................................15
4-3. Thread take-up spring ...................................................................................................................... 16
4-4. Adjusting the pressure of the presser foot.....................................................................................16
4-5. Needle-to-hook relation .................................................................................................................... 17
4-6. Adjusting the hook needle guard .................................................................................................... 18
4-7. Adjusting the bobbin case opener .................................................................................................. 18
4-8. Position of the counter knife and adjustment of the knife pressure (LS-2342S-7, 2342H-7) ..... 19
4-9. Adjusting the amount of the alternating vertical movement of the walking foot and the presser
foot .....................................................................................................................................................19
5. OPERATION OF THE SEWING MACHINE................................................................... 20
5-1. Hand lifter ..........................................................................................................................................20
5-2. Resetting the safety clutch .............................................................................................................. 20
5-3. Fixing the feed adjusting dial........................................................................................................... 20
5-4. Normal-/reverse-feed stitch needle entry points alignment at the time of automatic reverse
feed stitching (LS-2342S-7, 2342H-7) .............................................................................................. 21
5-5. Operation switches ........................................................................................................................... 22
5-6. Knee switch (LS-2342S-7, 2342H-7)................................................................................................. 24
6. SEWING SPEED TABLE ............................................................................................... 27
7. TROUBLES IN SEWING AND CORRECTIVE MEASURES......................................... 28

– 1 –
1. SPECIFICATIONS
No. Item Application
1 Model LS-2342S LS-2342S-7
2 Model name Cylinder-bed, 1-needle, unison-feed,
lockstitch machine
(Standard type)
Cylinder-bed, 1-needle, unison-feed,
lockstitch machine with automatic thread
trimmer (Standard type)
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 2,500 sti/min (See "6. SEWING SPEED TABLE" p.27.) *1
5 Needle SCHMETZ 134-35
(Nm 100 to Nm 180, Standard : Nm 140)
6 Applicable thread size for sewing #40 to #5
(US : #33 to #138, Europe : 90/3 to 20/3)
#30 to #5
(US : #46 to #138, Europe : 60/3 to 20/3)
7 Applicable thread size to be cut #30 to #5
(US : #46 to #138, Europe : 60/3 to 20/3)
8 Stitch length Max. 9 mm (forward/reverse feed)
9 Stitch length dial 1-pitch dial 2-pitch dial
10 Presser foot lift Hand lifter : 10 mm, Automatic presser foot lifter : 20 mm
11 Stitch length adjusting mechanism By dial
12 Reverse stitch adjusting method By lever Air cylinder type
(with touch-back switch)
13 Thread take-up Link type
14 Needle bar stroke 40 mm
15 Amount of the alternate vertical
movement
1 mm to 9 mm (Alternate vertical dial adjustment type)
16 Hook Full-rotary vertical-axis 1.6-fold hook (Latch type)
17 Feed mechanism Elliptical feed
18 Top and bottom feed actuation
mechanism
Timing belt
19 Thread trimming method Cam-driven scissors type
20 Lubrication Concentrated tank type oil wick lubrication (partially by manual)
21 Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32)
22 Tube diameter 72 mm
23 Space under the arm 347 mm × 127 mm
24 Hand wheel size Outer diameter : ø123 mm
25 Motor/Control box SC-922B
26 Machine head weight 61 kg 63 kg
27 Rated power consumption 310VA
28 Noise - Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes
KpA = 2.5 dB); according to ISO 10821-
C.6.3 - ISO 11204 GR2 at 2,500 sti/min.
- Sound power level (LWA);
A-weighted value of 89.5 dB; (Includes
KWA = 2.5 dB); according to ISO 10821-
C.6.3 - ISO 3745 GR2 at 2,500 sti/min.
- Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 77.5 dB; (Includes
KpA = 2.5 dB); according to ISO 10821-
C.6.3 - ISO 11204 GR2 at 2,500 sti/min.
*1 The speed setting according to the amount of the alternating vertical movement of the walking foot and presser
foot is automatically carried out.

– 2 –
No. Item Application
1 Model LS-2342H LS-2342H-7
2 Model name Cylinder-bed, 1-needle, unison-feed,
lockstitch machine
(Thick-thread type)
Cylinder-bed, 1-needle, unison-feed,
lockstitch machine with automatic thread
trimmer (Thick-thread type)
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 2,000 sti/min (See "6. SEWING SPEED TABLE" p.27.) *1
5 Needle SCHMETZ 134-35
(Nm 100 to Nm 180, Standard : Nm 180)
6 Applicable thread size for sewing #20 to #0 (US : #69 to #266, Europe : 40/3 to 10/3)
7 Applicable thread size to be cut #20 to #0
(US : #69 to #266, Europe : 40/3 to 10/3)
8 Stitch length Max. 9 mm (forward/reverse feed)
9 Stitch length dial 1-pitch dial 2-pitch dial
10 Presser foot lift Hand lifter : 10 mm, Automatic presser foot lifter : 20 mm
11 Stitch length adjusting mechanism By dial
12 Reverse stitch adjusting method By lever Air cylinder type
(with touch-back switch)
13 Thread take-up Link type
14 Needle bar stroke 40 mm
15 Amount of the alternate vertical
movement
1 mm to 9 mm (Alternate vertical dial adjustment type)
16 Hook Full-rotary vertical-axis 1.6-fold hook (Latch type)
17 Feed mechanism Box feed
18 Top and bottom feed actuation
mechanism
Timing belt
19 Thread trimming method Cam-driven scissors type
20 Lubrication Concentrated tank type oil wick lubrication (partially by manual)
21 Lubricating oil JUKI New Defrix Oil No. 2 (equivalent to ISO standard VG32)
22 Tube diameter 72 mm
23 Space under the arm 347 mm × 127 mm
24 Hand wheel size Outer diameter : ø123 mm
25 Motor/Control box SC-922B
26 Machine head weight 61 kg 63 kg
27 Rated power consumption 310VA
28 Noise - Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes
KpA = 2.5 dB); according to ISO 10821-
C.6.3 - ISO 11204 GR2 at 2,000 sti/min.
- Sound power level (LWA);
A-weighted value of 91.0 dB; (Includes
KWA = 2.5 dB); according to ISO 10821-
C.6.3 - ISO 3745 GR2 at 2,000 sti/min.
- Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 78.0 dB; (Includes
KpA = 2.5 dB); according to ISO 10821-
C.6.3 - ISO 11204 GR2 at 2,000 sti/min.
*1 The speed setting according to the amount of the alternating vertical movement of the walking foot and presser
foot is automatically carried out.

– 3 –
1) To prevent possible accidents caused by the full of
the sewing machine, perform the work by two per-
sons or more when the machine is moved.
Loosen bed cover mounting screws ❶(three lo-
cations) to remove them. Remove bed cover ❷.
Then, carry the sewing machine by holding pulley
cover ❸.
Do not hold the handwheel and the reverse
feed lever.
2) Do not put protruding articles such as the screw-
driver and the like at the location where the sewing
machine is placed.
❶
❷
❹
❸
1) Attach oil extractor ❶onto the top surface of the
machine table, and x it with setscrew ❷and wash-
er ❸.
2) After xing oil extractor ❶, screw drain container ❹
in the oil extractor.
2-1. Attaching the drain container
2-2. Installation of the sewing machine
2. INSTALLATION
❶
❸
❷

– 4 –
3) Fix the sewing machine in the four places of the ma-
chine table with countersunk screws ❹, washers ❺
and nuts ❻supplied with the sewing machine.
4) Securely attach head support rod ❼to the table
until it goes no further.
5) Mount spacers ❽supplied with the machine head
on the frame.
6) Install bracket 󱢳on CP panel ❾with screws 󱢴
supplied with the panel.
7) Install bracket 󱢳on spacer ❽with screws 󱢵sup-
plied with the machine head and washers 󱢶sup-
plied with the panel.
Do not use the screws supplied the panel
instead of screws 󱢵supplied with the ma-
chine head.
* Accessory screw 󱢵supplied with the machine head :
Thread diameter M5; Length 8 mm
❼
❽
❾
󱢶
󱢳
󱢵
󱢴
❹
❺
❻

– 5 –
(2) Installing the regulator
1) Install regulator (asm.) ❶on mounting plate ❺with
screw ❷, spring washer ❸and nut ❹which are
supplied with the unit.
2) Install couplings ❻and ❼on regulator ❶.
3) Attach mounting plate ❺on the undersurface of the
table with accessory screws ❽supplied with the
plate.
4) Connect ø6 air tube coming from the sewing ma-
chine to coupling ❻.
❷
❶
❺
❻
❼
❹
❸
❽
(1) Routing the air tube and cables
Pass the air tube and cables ❶through hole ❷in the
table down to the undersurface.
If humidity is high, water may leak from ø8 air tube ❸
for exhaust coming from the sewing machine.
(3) Adjusting the air pressure
1) The operating air pressure is 0.5 to 0.55 MPa.
Adjust the air pressure using air pressure regulating
knob ❶ of the lter regulator.
2) In the case uid accumulation is observed in Asec-
tion of the lter regulator, turn drain cock ❷to drain
the uid.
Decrease Increase
❶
❷
A
2-3. Pneumatic components
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
❸
❶
❷

– 6 –
2-4. Installing the thread stand
Assemble the thread stand, set it up on the machine
table using the installation hole in the table and tighten
nut ❶gently.
❶

– 7 –
3-1. Lubrication
If oil is excessively applied to A, B, Cand D, oil may drop from the throat plate base cover. Periodi-
cally wipe out oil on the throat plate base cover.
1) Be sure to lubricate the section indicated with arrows Ato Dwith an adequate amount of oil once a day be-
fore starting the operation.
2) Eis oil tank. Be sure to add oil to the oil tank approximately once a week.
3) Apply appropriate amount of oil to the arrowed sections when you operate the sewing machine for the rst time
after the purchase or after the machine has been left unused for an extended period of time.
3. PREPARATION OF THE SEWING MACHINE
WARNING :
1. Do not connect the power plug until the lubrication has been completed so as to prevent accidents due
to abrupt start of the sewing machine.
2.Topreventtheoccurrenceofaninammationorrash,immediatelywashtherelatedportionsifoilad-
heres to your eyes or other parts of your body.
3. If oil is mistakenly swallowed, diarrhea or vomiting may occur. Put oil in a place where children cannot
reach.
C
B
A
D
E

– 8 –
3-2. Attaching the needle
3-3. Attaching and removing the bobbin
Use 134-35 needles.
1) Turn the handwheel to bring the needle bar to the
highest position of its stroke.
2) Loosen needle clamp screw ❷. Hold the needle so
that the long groove on needle ❶faces directly to
the right.
3) Push needle ❶deep into the needle clamp hole
until it will go no further.
4) Tighten needle clamp screw ❷ rmly.
When replacing the needle, check the clearance provided between the needle and the blade point
of hook. (Refer to "4-5. Needle-to-hook relation" p.17 and "4-6. Adjusting the hook needle guard"
p.18.)
If there is no clearance, the needle and the hook will be damaged.
1) Lift latch ❶of hook, and take out the bobbin.
2) Put the bobbin into the shaft in the hook correctly
and release the latch ❶.
Do not make the machine run idle with the
bobbin (bobbin thread). The bobbin thread
is caught in the hook. As a result, the hook
may be damaged.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
❶
❶
❷
Long groove