Computer-controlled, High-speed, Lockstitch Buttonholing Machine

Computer-controlled, High-speed, Lockstitch Buttonholing Machine
LBH-1790
LBH-1790S
LBH-1790
The machine offers increased
flexibility. It achieves the
highest productivity and
seam quality.
The machine is provided as standard with as many as
30 stitch patterns for buttonholing.
It is able to store 99 different patterns in its memory, which can be selected as
desired from the operation panel.
● qSquare
wRound
eRadial square
rRadial
tRadial straight
bartacking
yRadial taper
bartacking
uEyelet square
iEyelet radial oEyelet straight
bartacking
!0Eyelet taper
bartacking
!1Semilunar
!2Round square
!3Semilunar
square
!4Semilunar straight !5Semilunar taper
bartacking
bartacking
!6Eyelet
semilunar
!7Eyelet round
!8Square radial
!9Square
semilunar
@0Square round @1Square straight @2Square taper
bartacking
bartacking
@3Radial
semilunar
@4Radial round
@9Bartacking,
left cut
#0Bartacking,
center cut
@5Semilunar
radial
@6Semilunar
round
@7Bartacking
@8Bartacking,
right cut
Multifunctional operation panel.
All kinds of data can be entered on or selected
from the operation panel.
● Various data, such as pattern numbers and
stitch shapes are indicated on the LCD section
with easy-to-understand pictographs.
● The machine eliminates oil stains on the sewing product.
● Thanks
to our advanced dry-head technology,
no lubrication is required except for the hook
section. This eliminates oil stains on the
sewing product.
● Only
a minute-quantity of clean oil is fed to the
hook section from the oil tank.
Non-lubricated
section
● The
machine can be completely changed into
a dry-head machine by replacing the hook
with an optional non-lubricated hook.
(In this case, the maximum sewing speed will
be 3,300rpm.)
Hook
Hook section
(minute-quantity
lubrication)
Oil tank
JUKI's unique active-tension (Electronic thread-tension-control system).
● Needle
thread tension for sewing parallel and bartacking
sections of buttonholes can be separately controlled
through the operation panel and stored in memory
according to various sewing conditions (e.g., type of
thread, type of material and sewing speed).
● The
machine is able to change the needle thread tensions
at the parallel and bartacking sections of the buttonhole,
to produce a beautiful buttonhole shape. This capability
helps greatly in preventing thread breakage. ● Needle
thread tension is activated at the beginning and
end of sewing. This prevents unthreading of the needle
thread, and thread fraying that is likely to occur at the
beginning of sewing. Solenoid
Needle thread tensioner
● Thread
tension for basting stitching can be specified
separately.
Frame shape offers improved operability.
● The
hollowed type frame promises efficient sewing of vertical buttonholes.
The machine can be operated with its head positioned horizontally.
● The
distance from the machine arm to the needle has been lengthened and
the left side section of the needle entry has been reduced by a large margin.
This helps in the smooth placement of the sewing product on the machine,
thereby ensuring improved workability. Longer distance from machine arm to needle
● The
sewing product can further be placed on the machine
easily by installing the auxiliary table (standard accessory).
In addition, the needle entry is located in the center of the
bed, promising easier positioning of the sewing product.
Bed the left side width of
which has been reduced
Auxiliary table (standard accessory)
Basting stitch mechanism is effective for the production of beautiful buttonholes.
buttonhole
● The
basting stitch is effective on elastic materials such as knits.
Two different stitching styles are possible, i.e., “basting stitch”
and “joining stitch.” These two styles of stitches may also be
combined. (Sewing is carried out in the order of joining stitch,
basting stitch and regular stitch.)
Basting stitch: Since the needle thread is tucked in without fail,
it will never jut out of the buttonhole seams.
Without basting stitch
With basting stitch
Basting stitch can be sewn by nine rounds.
Joining stitch: It works to prevent the buttonhole from
(The state in which the material is stretched in
expanding, thereby helping to finish beautiful
the lengthwise direction after buttonholing)
buttonholes.
Sewing settings can be easily changed.
Purl stitching ←
→ Whip stitching
Single stitching ←
→ Double stitching
Basting stitch
Joining stitch
Shorter length of bobbin thread
remaining on the material.
● The
new model of the bobbin thread trimming
mechanism cuts the bobbin thread so that it leaves
a shorter length of thread on the material.
Furthermore, the machine produces bartacks at the
end of sewing, thereby preventing finished seams
from coming undone.
Purl stitching
Whip stitching
(For a changeover between purl stitch
and whip stitch, threading of bobbin,
as well as the bobbin thread tension
need to be changed.)
State of firstround stitch
Finished state of
double stitching
•For double stitching, the bartacking
section is skipped and only the parallel
sections are sewn twice. This prevents
any excessively tight finishes in the
bartacking section of the buttonhole.
•First- and second-round stitches can be
sewn using different stitch widths.
The machine is equipped with a multiple
knife-dropping function.
● With
the soft-start function, the number of stitches,
as well as the sewing speed at the start of sewing
can be specified, thereby preventing the needle
thread from slipping off from the needle eyelet.
(From the first to the fifth stitches, the sewing speed
can be specified on a stitch-by-stitch basis.)
Cycle sewing and continuous sewing.
● The
Cycle sewing
● Twenty different programs can be registered, and as many
as 15 different patterns can be stored in one program.
Continuous sewing
● The machine is able to continuously sew two or more
different patterns without requiring the work clamp foot to
be lifted. As may as 20 programs can be registered, and
six different patterns can be stored in one program.
(Related parts need to be exchanged for optional ones.)
● The
Easy threading.
● Thanks
to the multiple knife-dropping function, it is no longer required
that the knife be changed at the time the buttonhole size is changed.
The number of knife dropping times can be automatically set according
to the buttonholing size in cases where the buttonhole size is frequently
changed for small-lot productions or during the cycle sewing of
buttonholes that are different in size.
double-acting solenoid type knife mechanism is free from the faulty
dropping/returning of the knife. In addition, the knife pressure can be
changed according to the material to be sewn.
knife supports sewing lengths of 41mm at the maximum. In addition,
knife mechanisms for 70mm and 120mm are optionally available. With
this, slots such as the belt holes of child seat belts can be buttonholed.
● The
needle bar can be shifted to the rightmost end
position with the work clamp foot lowered.
This facilitates threading of the machine head.
Position of the needle bar
during sewing
The needle bar can be shifted to
the right at the time of threading
Many functions of the pedal.
● The
machine is provided as standard with a newly-developed auto-lifter driven
by a stepping motor. This helps reduce the operator's fatigue. This helps reduce
operator fatigue. As for the pedal, one-pedal and two-pedal models can both be
changed over and the intermediate stop, which facilitates positioning of the
sewing product, can be specified.
● The
work clamp foot lift can be set as desired.
The reverse-rotation needle-up function offers
a maximum work clamp foot lift of 17mm.
● Explanation of pedal motion
Pedal type
Pedal motion
2-pedal
1-pedal
(without intermediate position)
1-pedal
(with intermediate position)
Initial position
②Intermediate position
Setting of sewing product
Presser goes up as high as the pedal
toe down amount of the left side pedal.
Presser comes down when the left
side pedal is depressed.
The first step of the right side pedal
→③Sewing position
→ ③Sewing position
Start of sewing
The right side pedal is depressed.
The second step of the right side pedal The third step of the right side pedal
End of sewing
②Presser automatically goes up to
intermediate position.
①Presser automatically goes up to
maximum position.
①Maximum position
①Maximum position
The first step of the right side pedal
→ ②Intermediate position
↓ The second step of the right side pedal
→ ③Sewing position
①Presser automatically goes up to
maximum position.
Work clamp position
①Maximum position
②Intermediate position
Cloth
③Sewing position
17mm
Major drive mechanism is electronically controlled.
● An
electronic control feature has been adopted for the material feed
mechanism, needle rocking mechanism, needle thread trimming mechanism,
bobbin thread trimming mechanism, cloth cutting knife mechanism and presser
bar lifting mechanism. In addition, mechanisms such as V-belts, stop-motion
mechanisms and cams have been substantially reduced to ensure operation
with lower vibration and noise.
Double acting solenoid
for the cloth cutting knife
●A
direct-driven system that directly connects the
compact AC servomotor to the main shaft has been
adopted.
● All
adjustment values are entered as data. They can be
set or stored in the memory on the operation panel.
Stepping motor
for the needle throw
Stepping motor for the cloth feed
Stepping motor
for the needle thread trimmer
Compact AC servomotor
(direct-drive)
Stepping motor
for the presser bar lifter
Stepping motor for the bobbin thread trimmer
Options
● Cloth cutting knife, Work clamp
Cloth cutting knife
B
Work clamp
Mark
Work clamp foot
A
Knife size
Part No.
6.4mm (1/4")
9.5mm (3/8")
11.1mm (7/16")
12.7mm (1/2")
14.3mm (9/16")
15.9mm (5/8")
17.5mm (11/16")
19.1mm (3/4")
B2702-047-F00
B2702-047-K00-A
B2702-047-I00
B2702-047-L00-A
B2702-047-V00
B2702-047-M00-A
B2702-047-A00
B2702-047-N00
22.2mm (7/8")
B2702-047-P00
25.4mm (1")
B2702-047-Q00-A
31.8mm (1-1/4")
B2702-047-S00-A
● Throat plate
Mark
For stitch width 5mm
Standard (S)
Part No.
(Length of cloth cutting knife)
<Type>(A×B)
F
K
I
L
V
M
A
N
△
◎
△
P
△
Q
S
B1552-781-000-A
(6.4〜19.1mm)
<1> (4×25mm)
For stitch width 6mm
Standard (S)
Part No.
(Length of cloth cutting knife)
<Type>(A×B)
◎ Part No.
<Type>
D1511-771-KA0
<1>
◎ 145-24409
(6.4〜31.8mm)
<3> (6×41mm)
B1552-782-000
(6.4〜25.4mm)
<2> (5×35mm)
B1552-783-000
(6.4〜31.8mm)
<3> (5×41mm)
△ D1511-772-KA0
<2>
△ D1511-773-KA0
<3>
SS-6060210-SP (2 pcs.)
◎Factory installed on machine △Supplied as an accessory (For LBH-1790S)
A
B
For needle throwing width
Part No. (Marking: A×B)
◎
400-04350 (S5: 1.4×6.2mm)
400-04351 (S6: 1.4×7.4mm)
5mm
6mm
◎Factory installed on machine
Designation
Part No.
400-06345
400-06349
Non-lubricated hook
137-29603
SS-8660612-TP
400-06340
SM-6040450-TP (3 pcs.)
145-23252
145-23401
145-23708
145-24102
Work clamp
400-08646
(For sewing length of 70 mm, 120mm) 400-08658
400-06335
400-06339
400-06341
400-06342
SM-6050800-SP (2 pcs.)
SS-6060210-SP (2 pcs.)
G5001-198-0A0-A
400-05405
Electric bobbin winder
B3221-771-0A0
SK-3452000-SC (4 pcs.)
GPK-510010B0
2-pedal unit for standing work
400-03493
Non-lubricated hook
Bobbin case
Hook (asm.)
Hook sleeve
Name of part
Features
RP hook (asm.)
By the installation of non-lubricated hook, the
RP bobbin case
machine is changed to be a fully dry-head
machine. (In this case, the maximum sewing
Hook sleeve (asm.)
speed will be 3,300rpm.)
Screws
Work clamp arm spacer
Screws
Work clamp foot 70 (asm.)
Exclusive to 70mm
Work clamp 70
The work clamp is
Urethane work clamp 70
Selectable
applicable to the
Flat work clamp 70
sewing length of 70mm
Work clamp foot 120 (asm.)
Exclusive to 120mm or 120mm. With this
Work clamp 120
work clamp, holing of
Work clamp arm 120
belt holes in child seat
Cloth feeding plate 120
is possible.
Close cam 120
Common to 70 mm
and 120 mm
Lifting plate 120
Screws
Screws
Electric bobbin winder (asm.)
Power cord (asm.)
It is a device for winding bobbin separately.
Tension controller (asm.)
Wood screws
Pedal switch (asm.)
−
Junction cable (asm.)
When you place orders
Please note when placing orders, that the model name should be written as follows:
[Machine head]
LBH1790S
Model
Knife width
6.4〜31.8mm
Type
Code
Code
Standard
S
0
[Control box]
MC601
SS
Power supply
Code
Single-phase
220〜240V
K
3-phase
200〜220V
E
230V
N
For CE Single-phase
(Not provided with a power switch)
● To order, please contact your nearest JUKI distributor.
LBH-1790S
Specifications
Max.: 4,200rpm, Normal: 3,600rpm
Sewing speed
When the non-lubricated hook (optional) is used: 3,300rpm
Needle bar stroke
34.6mm
Size of cloth cutting knife
6.4〜31.8mm (1/4"〜1-1/4")
Bartacking width
Max. 5.0mm (with special-specification part: Max. 10mm*)
Buttonhole length
Max. 41mm (optional: 70mm, 120mm)
Precision of needle throwing mechanism
Thread tension
0.05mm
Active-tension (electronic thread-tension-control system)
Number of stitches
Automatically computed from the size of the buttonhole and stitch pitch
DP×5 (#11J) #11J〜#14J
Needle (at the time of delivery)
DP type, full-rotary hook
Hook
Non-lubricated hook (optional)
Lift of the work clamp
14mm (17mm when the reverse-rotation needle-up function is used)
Auto-lifter
Provided as standard (stepping motor type)
Needle throwing drive system
Driven by a stepping motor
Cloth feeding knife drive system
Intermittent feed by a stepping motor
Cloth cutting knife drive system
By a double-acting solenoid
Standard patterns
30 patterns
Number of patterns that can be input
Max. 99 patterns
Bobbin thread winder
Built-in the machine head
Machine head drive system
Compact AC servomotor (direct-drive system)
Power requirement/ Power consumption
Lubrication
Lubricating oil
Single-phase 220V, 230V, 240V・3-phase 200〜240V/ 1000VA
Only the hook section needs a minute-quantity lubrication.
* No lubrication is required when the non-lubricated hook (optional) is used.
Hook: JUKI New Defrix Oil NO.1 (equivalent to ISO VG7)
Total weight
112kg
*The special-specification part is available on a special order. Contact our branch or office in your area.
HEAD OFFICE
EMS Accreditation
RE005
INTERNATIONAL SALES H.Q.
ISO14001:1996
REG.NO.JSAE389
089
The environmental management system to promote and conduct
➀the technological and technical research, the development and
design of the products in which the environmental impact is
considered,
➁the conservation of the energy and resources, and the recycling,
in the research, development, design, distribution, sale and
maintenance service of the industrial sewing machines,
household sewing machines and industrial-use robots, etc. and
in the purchase, distribution and sale of the household
commodities including the healthcare products.
8-2-1, KOKURYO-CHO, CHOFU-SHI,
TOKYO 182-8655, JAPAN
PHONE : (81) 3-3430-4001〜4
FAX : (81) 3-3430-4909.4914
http://www.juki.com
✽ Specifications and appearance are subject to change without prior notice for improvement.
✽ Read the instruction manual before putting the machine into service to ensure safety.
✽ This catalog is printed on recycle paper.
NOVEMBER, 2002 Printed in Japan(AD)
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