JUKI LK-1910 User manual

1
INSTRUCTION MANUAL
LK-1910, LK-1920

i
CONTENTS
1. SPECIFICATIONS................................. 1
2. CONFIGURATION ................................ 2
2-1. Names of main unit ...........................................2
2-2. Names and explanation of switches on the
operation panel..................................................3
3. INSTALLATION..................................... 4
3-1. Installing the table.............................................4
3-2. Installation procedure of the electrical box ....5
3-3. Connecting the power source cord .................6
3-4. How to carry the sewing machine....................7
3-5. Installation of the sewing machine head.........7
3-6. Installing the motor cover.................................8
3-7. Pedal switch.......................................................8
3-8. Tilting the sewing machine head .....................9
3-9. Installing the operation panel...........................9
3-10. Connecting the cords .....................................10
3-11. Handling the cords.......................................... 11
3-12. Installing the eye protection cover................11
3-13. Installing the thread stand .............................12
3-14. Installing the auxiliary throat plate cover .....12
3-15. Attaching and removing the bolt for
transportation ..................................................13
4. OPERATION OF THE SEWING MA-
CHINE ................................................. 14
4-1. Lubrication.......................................................14
4-2. Attaching the needle .......................................15
4-3. Threading the machine head..........................15
4-4. Installing and removing the bobbin case......16
4-5. Installing the bobbin .......................................16
4-6. Adjusting the thread tension..........................16
4-7. Adjusting the thread take-up spring..............17
4-8. Adjusting the height of the intermediate
presser (Only for the LK-1920).......................17
4-9. Adjusting the intermediate presser stroke (Only
for the LK-1920) ...............................................17
5. OPERATION OF THE SEWING MA-
CHINE (BASIC) .................................. 19
5-1. Model selection................................................19
5-2. Selection of language .....................................19
5-3. Setting the pattern number.............................20
5-4. Setting the item data .......................................20
5-5. Checking the contour of a sewing pattern....23
5-6. Sewing..............................................................24
5-7. Changing the pattern to a different one ........25
5-8. Winding a bobbin ............................................25
5-9. Adjustment of the bobbin thread winder
components.....................................................27
6. OPERATION OF THE SEWING MA-
CHINE (ADVANCED).......................... 28
6-1. Performing sewing using the pattern keys...28
6-2. Sewing using the combination function (cycle
sewing).............................................................32
6-3. Sewing through the use of the counter.........35
6-4. How to use the temporary stop......................38
6-5. Copying or deleting various kinds of pattern
data...................................................................39
6-6. Communication ...............................................41
6-7. Cautions in operation......................................43
6-8. Setting enable/disable of standard pattern
invoking............................................................44
7. MAINTENANCE.................................. 45
7-1. Adjusting the height of the needle bar ..........45
7-2. Adjusting the needle-to-shuttle relation........46
7-3. Adjusting the lift of the work clamp foot.......47
7-4. The moving knife and counter knife..............47
7-5. Adjusting the rising amount of the thread
tension disk .....................................................48
7-6. Thread breakage detector plate .....................48
7-7. Draining waste oil............................................49
7-8. Replacing the fuse...........................................49
8. HOW TO USE THE MEMORY
SWITCH .............................................. 50
8-1. Method of changing memory switch data.....50
8-2. List of the memory switch functions.............51
9. OTHERS.............................................. 55
9-1. LK-1910/-1920 data ROM.................................55
9-2. Connection of the optional pedal...................55
9-3. Error list............................................................58
9-4. Troubles and corrective measures ................62
9-5. Table of the optional parts..............................63
9-6. Silicon oil tank .................................................64
10. DRAWING OF THE TABLE .............. 65

－1 －
1 Sewing area X (lateral) direction 100 mm Y (longitudinal) direction 60 mm
2 Max. sewing speed 2500 sti/min* (When sewing pitches are less than 3 mm.)
3 Stitch length 0.1 to 10.0 mm (adjustable in 0.1 mm step)
4Feed motion of work clamp
foot Intermittent feed (2-shaft drive by stepping motor)
5 Needle bar stroke 41.2 mm
6 Needle DP × 5, DP × 17
7 Lift of work clamp foot 18 mm (standard) Max. 22 mm (Pneumatic type : max. 25 mm)
8 Hook 2-fold semi-rotary hook (oil wick lubrication)
9Intermediate presser
stroke
4 mm (standard)
(Adjustable in the range of 0 and 4 to 10 mm) (LK-1920 only)
10 Lift of intermediate presser 18 mm (LK-1920 only)
11 Lubricating oil New Defrix Oil No. 2 (supplied by oiler)
12 Data recording Memory in MAIN PCB (80 Kbyte)
EEP-ROM (32 Kbyte)
13 Enlarging / Reducing facility 20 % to 200 % (1% step) in X direction and Y direction respectively
14 Enlarging / Reducing
method Pattern enlargement / reduction can be done by increasing/decreasing the stitch length
15 Temporary stop function Used to stop machine operation during a stitching cycle.
16 Thread breakage detection
function Used to detect needle thread breakage to automatically stop machine.
17 Max. sewing speed limita-
tion 200 to 2,500 sti/min* (100 sti/min steps)
18 Pattern selection
Standard patterns : 51
User patterns : 1 to 200
Old user patterns : 1 to 99
Media patterns : 1 to 999
19 Bobbin thread counter UP/DOWN type (0 to 9999)
20 Sewing machine motor Servo motor
21 Dimensions W : 1200 mm L : 700 mm H : 1160 mm
(Use the standard table and stand.)
22 Mass (gross mass) Machine head : 46 kg Control box : 5 kg
23 Power consumption 380 VA (Operation for 35 seconds at 2,500 sti/min; at rest for two seconds)
24 Operating temperature
range 5 ˚C to 35 ˚C
25 Operating humidity range 35 % to 85 % (No dew condensation)
26 Line voltage Rated voltage ±10% 50/60 Hz
27 Air pressure used 0.5 to 0.55 MPa (Only for the pneumatic type)
28 Air consumption 1.3 ℓ/min (Only for the pneumatic type)
29 Noise
- 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 for the sewing cycle, 1.0s ON (Pattern : No.1).
- Sound power level (LWA) ;
A-weighted value of 77.5 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.3
-ISO 3744 GR2 at 2,500 sti/min for the sewing cycle, 1.0s ON (Pattern : No.1).
* Reduce the max. sewing speed in accordance with the sewing conditions.
1. SPECIFICATIONS

－2 －
2. CONFIGURATION
❶Machine head
❷ Needle thread breakage detecting plate
❸ Wiper switch
❹ Temporary stop switch
❺Intermediate presser (LK-1920 only)
❻Work clamp feet
❼Manual pedal (Only for the pneumatic type)
❽Pedal switch (Shape of pneumatic type is different.)
1st step : Work clamp foot switch. 2nd step : Start switch
❾Thread stand
󱢳Operation panel
󱢴Electrical box
󱢵Power switch
2-1. Names of main unit
Air regulator
(Only for the pneumatic type)
❶
❻
❾
󱢵
󱢴
❼
󱢳
❹
❷
❺
❽
❸

－3 －
2-2. Names and explanation of switches on the operation panel
No. NAME FUNCTION
❶LCD display Various data such as pattern
No., shape, etc. are displayed.
❷READY key Press this key when starting
sewing.
Every time this key is pressed,
change-over of sewing ready
set state and data set state
can be performed.
❸RESET key Press this key when releasing
error, traveling the feed mech-
anism to its initial position,
counter resetting, etc.
❹MODE key This key is used for displaying
the mode screen.
❺PRESSER and
WINDER key
This key lifts or lowers the
presser. When the presser
goes up, the needle bar travels
to the origin and when it comes
down, the needle bar travels to
the right.
This key is pressed when per-
forming bobbin winding.
❻ITEM SELECT key This key is used to select the
data No. and other kinds of
data.
❼DATA CHANGE key This key is used to change the
pattern No. and other kinds of
data.
This key is used to move the
feed forward on a stitch-by-
stitch basis.
No. NAME FUNCTION
❽EDIT key This key is used to display the
edit screen, to select the item
or to display the detail screen.
❾RETURN key This key is used to return the
screen to the previous one.
󱢳DIRECT PATTERN This key registers the pattern.
When this key is pressed, the
pattern registered here can
sew immediately.
X/Y scale, sewing position,
etc. can be changed and regis-
tered.
󱢴THREAD TENSION
key
This key is not used for the LK-
1910 and LK-1920.
󱢵THREAD CLAMP
key
This key is not used for the LK-
1910 and LK-1920.
󱢶SET READY LED The LED lights up under the
sewing mode.
❶
❷󱢶 ❺❹❸
❻❼
❽
❾
󱢳
󱢴
󱢵

－4 －
3. INSTALLATION
1) Securely install control box ❷, power switch ❸and pedal switch ❹on table (14117501) ❶. (Refer
to "3-2. Installation procedure of the electrical box" p.5 for the electrical box.)
2) Connect the pedal with ❹the pedal switch using the chain 󱢵.
3) Securely x the respective power cables with the staples.
4) Securely x oil drain ❼on the table ❶, and screw oil receiver ❽.
5) Set cushion rubber ❺on oil pan ❻, and t oil pan ❻to the holes of the table hinges (4 places) ❾.
Then x oil pan ❻at 4 places with wood screws.
6) Close the center portion of oil pan ❻with the rubber plug after screwing it.
7) Strike head support bar 󱢳in the hole of table 󱢴.
8) Connect the pedal with manual pedal link A (machine head side) using chain 󱢶supplied with the
machine.
3-1. Installing the table
For pneumatic type, it is not necessary to install ❹, 󱢵and 󱢶.
❶
❷
❺
❹
❸
❻
❼
❽
❾
󱢳
󱢴
󱢵
Note) 󱢶
Note)
Note)
DANGER :
To prevent possible accidents caused by the fall of the sewing machine, perform the work by two
persons or more when the machine is moved.

－5 －
①
②
③
④
⑤
❶
❷
❷
⑥
⑦
⑨
⑧
➡
❸
❸
❶
3-2. Installation procedure of the electrical box
1) Secure electrical box mounting
plate ❶on the table with screw
asms. A(at four locations).
Push electrical box mounting plate
❶away from you until the screws
are pressed against U groove ❷.
Then, secure the electrical box
mounting plate.
Screw asm. B
Part No.
①SM3065052TN
②WP0615001SC
③WP0651646SC
④WS0610002KN
⑤NM6060001SC
2) Temporarily put the nuts over
screws of screw asms. Band
place two screw asms. Bat the
far side of electrical box mounting
plate ❶.
Part No.
⑥NM6080003SC
⑦WS0820002KR
⑧WP0852086SC (Two pieces)
⑨SM6083502TN
3) Insert the electrical box while aligning
U-groove in the aluminum frame of electrical
box ❸with screw asms. B.
4) Placing two remaining screw asms. B(two
asms.) at this side of electrical box mounting
plate ❶, secure the electrical box ❸.
Screw asm. B
Screw asm. A
Screw asm. B
Screw
asm. A
Screw asm. A
Screw asm. B
Screw asm. B
Screw asm. B
❶

－6 －
3-3. Connecting the power source cord
Never use under the
wrong voltage and
phase.
Table
Brown Brown
Light blue Light blue
Light
blue
Green/Yellow Green/
Yellow
Control box
Green/Yellow
Plug
Power source cord
Power switch
GND
AC
200 V
-240 V
AC
200 V
-240 V
• Connecting single phase 200V, 220V, 230V and 240V
Table
Red
Black
Green/Yellow
White
Control box
Power source cord
Plug
Power switch
GND
• Connecting three phase 200V, 220V, 230V and 240V
Green/Yellow
Red
White
Black
Green/
Yellow
Red
White Black
Rating plate
Power indication tag
(For example: In
the case of 200V)
Brown
Voltage specications at the time of delivery from the factory are indicated on the voltage indication
seal. Connect the cord in accordance with the specications.

－7 －
3-4. How to carry the sewing machine
Hold section Awhen moving the sewing machine. In addition, do not hold motor portion B.
The sewing machine weighs over 46 kg. Be sure to carry the sewing machine with two or
more people without exceptions.
Fit hinge rubber ❶ to the hinge shaft ,and x the
sewing machine main unit.
Attaching the pedal chain (For solenoid type
only)
Connect the manual pedal link ❷and manual
pedal with chain ❸.
3-5. Installation of the sewing machine head
WARNING :
To prevent possible accidents caused by the full of the sewing machine, perform the work by two
persons or more when the machine is moved.
B
A
A
❶
❷
❸
❶

－8 －
3-6. Installing the motor cover
Install motor cover ❶to the sewing machine main
unit using the screws set in the cover.
❶
• 1 pedal for solenoid type • 3-step pedal for pneumatic type (optional)
J26
MAIN circuit board
J18
MAIN circuit board
J26
MAIN circuit board
P.101 to P.105
P.1 to P.4
J19
J18
J19
PK-47 Connection cord Signal name
P1 P101 Feeding frame 1
P2 P102 Feeding frame 2
P3 P103 Feeding frame 3
- P104 Not used
P4 P105 Start
3-7. Pedal switch
• 3-step PK pedal for pneumatic type (optional)
Connect PK-47 to the connection cord
as described below.
Either J18 or J26 of MAIN circuit board can be used for the pedal.
Remove the pedal which is not used since the machine may fail to work if both pedals are
simultaneously connected.

－9 －
When tilting the sewing machine head, tilt the
head gently until it comes in contact with head
support rod ❶.
3-8. Tilting the sewing machine head
1. Before tilting the sewing machine
head, make sure that head support rod
❶is attached to the machine table.
2. When the sewing machine head is tilt-
ed, feeding frame ❷moves to the left
side by itself and interferes with the
intermediate presser or the like. As a
result, it will be the cause of breakage.
Remove the aforementioned component
in advance, or x feed plate ❸to throat
plate support cover ❹with tape or the
like, and tilt the sewing machine head.
3-9. Installing the operation panel
In the case of installing the operation panel on
the undersurface of the table, install the operation
panel on panel mounting plate ❶by tightening
screws ❹ in four mounting holes. Then, x the
panel mounting plate at a desired position on the
undersurface of the table with four wood screws ❷.
Fix operation panel mounting plate ❶on the table
with four wood screws ❷. Then, pass the cable
through hole ❸in the table.
WARNING :
Tilt/raise the sewing machine head with both hands taking care not to allow your ngers to be caught
in the head. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt
start of the sewing machine.
3. When tilting the sewing machine head while holding motor cover ❺and throat plate support
cover ❹, the covers may be bent. Be sure to tilt the sewing machine head while holding the
main unit of the sewing machine.
4. Be sure to tilt the sewing machine head on a at place to prevent it from falling.
❶
❷
❸
❶
❹
❷
❶
❺
❷
❹❸

－10 －
3-10. Connecting the cords
1) Loosen four setscrews ❷of control box cover ❶. Re-
move control box cover ❶.
2) Connect the cords to the respective connectors on
MAIN PWB, SDC PWB. (Fig. 1)
3) Fix the machine-head ground wire and the main-motor
ground wire at the location shown in Fig. 2 with screws.
* [CN10 (J4)] is printed on the marker of the cable of
the J4 white 3P connector. Connect the cable to the
J4 on the MAIN PCB according to this marker.
❷
❶
MAIN PWB
SDC PWB
Fig. 2Fig. 1
Main motor
ground wire Machine head
ground wire
CN17A
CN15
FG
J4
J12
J13
J14
J15
J55
J53
J20
J21
J22
9P
White *
White
Blue
Blue
Yellow
J17
J19
J18
CN34
J79
J79
J78
Operation panel
3P
J26
26P
Sewing machine head
Pressure switch
For pneumatic type only
For solenoid
type only
Pedal
(Refer to "3-7. Pedal
switch" p.8 .)
2P
6P
2P
3P
4P
12P
3P
10P
9P
3P
2P
6P
2P
3P
Main motor ground wire
DANGER :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing
machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.
To prevent accidents caused by unaccustomed work or electric shock, request the electric expert
or engineer of our dealers when adjusting the electrical components.
White
White
White
White
White
White
White
Red
Red
Black
Black
Gray
CN34 Gray
J55 Blue
J14 White
J15 Blue
J53 Red J59 Yellow
J12 Black J13 White
J17 White
J4 White *
J22B White
J21 Yellow
J20 Red
J26 White
CN17A White
CN15 White
J18 White
J19 Black

－11 －
3-11. Handling the cords
Pass the cords connected inside the electrical
box through cord exit plate ❶ and x with cable
clip band ❷. Bind the excess cord with cable clip
band ❺ as illustrated in the gure.
Install control box lid ❸with four setscrews ❹.
Be sure to use eye protection cover ❶after in-
stalling it on installing section ❸with screws ❷.
3-12. Installing the eye protection cover
When binding the cord, tilt the sewing
machine in prior.
❶
❸
❷
DANGER :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing
machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.
To prevent accidents caused by unaccustomed work or electric shock, request the electric expert
or engineer of our dealers when adjusting the electrical components.
WARNING :
Be sure to attach this cover to protect the eyes from the disperse of needle breakage.
❸
❹
❶❷
❺

－12 －
3-13. Installing the thread stand
1) Assemble the thread stand unit, and insert it
in the hole in the machine table.
2) Tighten locknut ❶ to x the thread stand.
3) For ceiling wiring, pass the power cord
through spool rest rod ❷.
1) Install the auxiliary throat plate cover support
❷to auxiliary throat plate cover ❶using set-
screw ❸(L = 6) and washer ❹.
2) Install the cover on the machine arm using
attaching screw ❺(L = 8).
3-14. Installing the auxiliary throat plate cover
Adjust so that the auxiliary throat plate
cover should be almost levelled with
the throat plate. If there is a difference
in height, the feed plate may be caught
with the auxiliary throat plate cover.
❶
❷
❺
❸
❹
❶
❷

－13 －
3-15. Attaching and removing the bolt for transportation
When transporting the sewing machine, x the sewing machine main unit and table with the bolt for
transportation.
When operating the sewing machine, remove the bolt. If the machine is operated with the bolt xed,
vibration of the machine head is transmitted to the table. As a result, feed movement may be badly
affected or the element inside the control box may be damaged.
(When transporting the
sewing machine)
(When using the
sewing machine)

－14 －
4. OPERATION OF THE SEWING MACHINE
4-1. Lubrication
Be sure to perform the above 2) and
3) steps when the machine is rst
installed, or when it is run after a
long period of disuse.
3) Remove the top cover, and apply oil to
crank rod oil shield ❹, front bushing ❺
and intermediate bushing ❻.
Font bushing Intermediate bushing
2) Apply one drop of oil to hook race ❸part to
spread on it.
1) Once a day, ll oil from oil hole ❶on the ma-
chine head up to the red mark in the center of
oil gauge ❷.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
❹
❺❻
❸
❶
❷
❷
❶

－15 －
4-3. Threading the machine head
Pull out the thread by approximately 40 mm from the needle after threading through the needle.
Loosen setscrew ❶and hold needle ❷with the
long groove ❸facing toward you. Then fully insert
it into the hole in the needle bar, and tighten set-
screw ❶.
4-2. Attaching the needle
If the stitches are made as shown in A,
attach the needle facing to the direc-
tion Bto a small extent.
When threading the needle, carry out the following steps of procedure to lower the intermediate presser
and the feeding frame in prior. (* Only for the LK-1920)
1) Press READY key ❶on the operation panel.
2) Press PRESSER and WINDER key ❷to lower the intermediate presser and the feeding frame.
3) After the completion of needle threading, press PRESSER and WINDER key ❷again to return the
intermediate presser and the feeding frame to their upper position.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
WARNING :
Placing your hands or ngers under the presser foot may invite the risk of injury due to pinching by
the presser foot or puncture by the needle. Do not place your hands, etc. under the presser foot to
protect from injury.
❸A
B
❶
❷
LK-1910S∆
LK-1920S∆
LK-1910H∆
LK-1920H∆
❶ ❷

－16 －
1) Open hook cover ❶.
2) Raise latch ❸of bobbin case ❷, and remove
the bobbin case.
3) When installing the bobbin case, fully insert it
into the shuttle shaft, and close the latch.
4-4. Installing and removing the bobbin case
❶
❷
❸
If it is not fully inserted, bobbin case ❷
may slip off during sewing.
1) Set the bobbin ❶into bobbin case ❷in the
direction shown in the gure.
2) Pass the thread through thread slit ❸of bob-
bin case ❷, and pull the thread as it is. By so
doing, the thread will pass under the tension
spring and be pulled out from thread hole ❹.
3) Pass the thread through thread hole ❺of the
horn section, and pull out the thread by 25 mm
from the thread hole.
4-5. Installing the bobbin
❶❷
❺
❹
❸
25 mm
If the bobbin is installed in the bobbin
case orienting the reverse direction,
the bobbin thread pulling out will result
in an inconsistent state.
4-6. Adjusting the thread tension
Long
Short
If thread tension controller No. 1 ❶is turned
clockwise, the length of remaining thread on the
needle after thread trimming will be shorter. If it is
turned counterclockwise, the length will be longer.
Shorten the length to an extent that the thread is
not slipped off.
The needle thread tension is to be adjusted with
thread tension combination ❸. The bobbin thread
tension is to be adjusted with ❷.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
❷
❶
❸

－17 －
The nut may be removed if setscrew ❶
is excessively loosened. So, be careful.
Loosen setscrew ❶by a half turn to
properly adjust the stroke.
The standard stroke of thread take-up spring ❶
is 6 to 8 mm, and the pressure at the start is 0.3
to 0.5 N.
1) Adjusting the stroke
Loosen setscrew ❷, and turn thread tension
asm. ❸.
2) Adjusting the pressure
Insert a screwdriver into the slit of thread ten-
sion rod ❹, and turn it.
3) If you have changed the stroke of the thread
take-up spring, adjust the thread breakage
detecting plate, referring to "7-6. Thread
breakage detector plate" p.48 .
4-7. Adjusting the thread take-up spring
❶
❷
0.5 mm
1) Lower the intermediate presser ❷.
(Refer to "4-3. Threading the machine
head" p.15 .)
2) Turn the handwheel to lower the intermediate
presser ❷to its lowest position.
When the intermediate presser ❷is in the
lowest position of its stroke, adjust so that the
clearance between the intermediate presser
and the cloth is approximately 0.5 mm.
3) Loosen setscrew ❶and adjust the height of
intermediate presser ❷.
❶
A
B
1) Remove the machine arm side cover.
2) Loosen setscrew ❶and move it in the direc-
tion of arrow for adjustment.
3) If moving in the direction of A, the stroke will
be decreased. (Min. 4 mm)
If moving in the direction of B, the stroke will
be increased. (Max. 10 mm)
4-8. Adjusting the height of the intermediate presser (Only for the LK-1920)
4-9. Adjusting the intermediate presser stroke (Only for the LK-1920)
(1) Adjusting the intermediate presser stroke to 4 to 10 mm
❶
❷
❹
❸

－18 －
(2) Adjusting the intermediate presser stroke to 0 mm
Intermediate presser cam stopper
❶
A
B
C
1) Remove the top cover.
2) Loosen two setscrews ❶in the intermediate
presser cam and slide the cam in the direction
of Bby 7 to 10 mm. Then, tighten setscrews
❶.
3) When returning the cam to its home position
again, loosen setscrews ❶, slide the cam
in the direction of C, strike the end face of
the intermediate presser cam against the
intermediate presser cam stopper, and align
the engraved marker dots A. Then, tighten
setscrews ❶.