JUKI MF-7900 Series, MF-7900D Series Specification


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JUKI MF-7900 Series, MF-7900D Series Specification | Manualzz

MF-7900 Series

High-speed, Cylinder-bed, Top & Bottom Coverstitch Machine

MF-7900D Series

Semi-dry-head, Cylinder-bed, Top & Bottom Coverstitch Machine

MF-7923D-U11-B56

The MF-7900 Series is a newly developed coverstitch machine provided with lots of mechanisms for improving the seam quality.

It is provided with many different sewing-related mechanisms which contribute to improved seam quality, such as the new feed mechanism, and differential-feed micro-adjustment mechanism. In addition, the machine is provided as standard with a looper thread twining prevention mechanism for improved maintenance.

MF-7900

Series

High-speed, Cylinder-bed,

Top & Bottom Coverstitch Machine

MF-7900/UT

Series

Direct-drive, High-speed, Cylinder-bed,

Top & Bottom Coverstitch Machine with Needle- and Looper- Thread Trimmer

MF-7900D

Series

Semi-dry-head, Cylinder-bed,

Top & Bottom Coverstitch Machine

MF-7900D/UT

Series

Semi-dry-head, Direct-drive, Cylinder-bed,

Top & Bottom Coverstitch Machine with Needle- and Looper- Thread Trimmer

Seam quality is improved !!

Thanks to the new feed mechanism, many different types of sewing are achieved.

The feed locus can be adjusted externally. The feed locus is now adjustable in terms of the vertical direction and horizontal direction, thereby improving responsiveness to sewing materials.

The world's first

Micro-lifter mechanism

Elastic material or delicate material can be sewn with the presser foot kept slightly raised.

This effectively helps reduce the degree of slippage, warpage and damage of the material.

Differential-feed micro-adjustment mechanism

It is possible to finely adjust the differential feed amount to a best-suited value for the material to be used.

The differential feed ratio is constant even if the stitch

Main feed dog length is changed.

Differential feed dog

Expand

Vertical direction

Horizontal direction

Contract

Simplified maintenance mechanism

The looper thread twining prevention mechanism has been improved and is provided as standard for the sewing machine.

In the case of looper thread breakage, the looper thread twining prevention mechanism is activated to trim the looper thread before the thread twines on the looper thread cam. In this way, the looper thread twining prevention mechanism prevents the looper

The world's first thread from twining on the looper thread cam. In addition, the looper thread cam, which has been incorporated in the sewing machine, has been changed so that it is mounted outside of the sewing machine. The externally-mounted looper thread cam promises improved maintainability.

Commercially-available gauge components are applicable with no additional work.

As a result of the commonality of components, commercially-available components (presser foot, throat plate and needle clamp) are now applicable and easily obtainable.

All of the sewing machines with a thread trimmer are provided with a direct-drive motor.

The direct-drive motor system has been adopted by all of the sewing machines with a thread trimmer. As a result, the sewing machine starts up swiftly and promises increased stop accuracy, thereby demonstrating improved responsiveness.

In addition, the machine is no longer provided with a V-belt. This means that the adoption of the direct-drive motor is also effective in the elimination of belt shavings. Power is directly transmitted from the motor to the sewing machine, thereby contributing to reduced power consumption. (This sewing machine reduces power consumption by 27% as compared with the conventional models.)

Servomotor

MF7823/UT22/SC510

Direct-drive motor

MF-7923/UT57/SC921/CP18

Power consumption

Reduced by

27%

JUKI's dry-head technology protects sewing products from being stained with oil.

With the excellent functions inherited from the MF-7900 Series, the MF-7900D is provided with a dry frame mechanism to eliminate the cause of oil stains. Stain removing work or re-sewing work is substantially reduced by protecting sewing products from being stained with oil, thereby improving the quality of finished products.

The frame no longer requires oiling.

Unlike the conventional models, the oiling mechanism inside the frame has been eliminated.

As a result, oil does not leak from the needle bar, presser bar or spreader shaft.

Dry-head technology has materialized a frame which does not need oiling.

The needle bar mechanism and spreader mechanism have been applied with a special surface treatment.

JUKI's unique special grease is used for lubrication. Grease-filled bearings have been adopted for the crank rod. These allow the machine's frame mechanism to demonstrate outstanding durability without being oiled.

Environmental consciousness

Since oil stains on sewing products are reduced, the quantity of the use of stain remover generally used in sewing plants can be reduced.

Dichlorofluoroethane (HCFC-141), which is generally used in oil stain cleaning fluid, is included in those chemicals which need to be reduced, as it is a substances that can harm the ozone layer.

The semi-dry head sewing machine increases its sewing speed to

5,000 sti/min

A semi-dry head type sewing machine has been added.

Needle bar stroke conversion mechanism

By changing over the needle bar stroke, penetrating force of the needle as well as thread tension to fit heavy-weight materials (fleece, blankets) can be obtained. The needle bar stroke can be changed by adjusting the eccentric pin.

(Changing of parts is not required. Factory-set at the time of delivery: 31mm; for sewing heavy-weight materials: 33mm)

U11

Universal type

(basic type)

T-shirts

Polo shirts knitwear sportswear

The machine can be used for the hemming process of the sleeves and bottoms of T-shirts and for the covering process for sportswear and knitwear.

The front cover is trimmed to allow operators to bring their hands closer near the needle entry area, thereby increasing work efficiency in the covering process, etc.

Binder mounting base

Various binders can be installed by loading the binder mounting base supplied with the unit.

MF-7923-U11-B56/UT51

List of subclass machines

Application Seam Model No.

Number of needles

2

Number of threads

4

Needle gauge

(mm)

3.2,4.0,4.8

Stitch length *

(mm)

1 Differentialfeed ratio * 2

MF-7900/U11

Universal type

(basic type)

MF-7922-U11-B **

MF-7923-U11-B **

MF-7923-U11-B ** /PL12,PL13

MF-7922-U11-B48/UT51

MF-7923-U11-B ** /UT51,UT57

MF-7923-U11-B ** /UT59

MF-7923-U11-B ** /UT52/PL12

MF-7923-U11-B ** /UT57/PL13

3

2

3

5

4

5

5.6,6.4

4.8

5.6,6.4

0.9~3.6

1:0.9~1:1.8

(1:0.6~1:1.1)

MF-7900D/U11

Universal type

(basic type)

MF-7922D-U11-B40

MF-7923D-U11-B **

MF-7923D-U11-B ** /UT51,UT57

MF-7923D-U11-B ** /UT59

2

3

4

5

4.0

5.6,6.4

0.9~3.6

*1 Stitch length can be adjusted to 4.5mm at the maximum. *2 Differential ratio can be switched by adjustment.

*3 The lift of the presser foot is 5mm for the top and bottom coverstitch machine, and 8mm for the bottom coverstitch machine. *4 "sti/min" stands for "Stitches per Minute."

1:0.9~1:1.8

(1:0.6~1:1.1)

Presser foot lifting amount *

(mm)

3

5 (8)

5 (8)

Max. sewing speed

(sti/min)* 4

6,500

5,000

6,000

6,000

5,000

5,000

H11

For elastic band welting

H11 with PL

Swimwear Briefs

This model is best suited to elastic-band welting for swimwear, briefs, etc. It welts the elastic band which has been overlocked on the garment body.

List of subclass machines

MF-7923-H11-B56/PL13

Application Seam Model No.

Number of needles

Number of threads

Needle gauge

(mm)

Stitch length *

(mm)

1 Differentialfeed ratio * 2

Presser foot lifting amount *

(mm)

3

Max. sewing speed

(sti/min)* 4

MF-7900/H11

Elastic band welting

MF-7923-H11-B ** /PL12

MF-7923-H11-B ** /PL13

MF-7923-H11-B ** /UT52,UT57/PL12

MF-7923-H11-B ** /UT57/PL13

3 5 5.6,6.4

0.9~3.6

1:0.9~1:1.8

(1:0.6~1:1.1)

5 (8)

*1 Stitch length can be adjusted to 4.5mm at the maximum. *2 Differential ratio can be switched by adjustment.

*3 The numeric value indicates the lifting amount of the presser foot for top and bottom coverstitch. The numeric value given in parentheses indicates the lifting amount of the presser foot for bottom coverstitch.

*4 "sti/min" stands for "Stitches per Minute."

5,000

H22,H23

For hemming

(with left hand fabric trimmer)

T-shirts

Polo shirts

This model is best suited to hemming processes for sleeves and the bottoms of T-shirts, Polo shirts, etc. It comes with a left hand fabric trimmer for trimming fabric in parallel, at all times, to the seam with consistency. The upper knife stroke can be adjusted with ease.

List of subclass machines

MF-7923D-H23-B56/UT57

★ :The world's fastest sewing machine with left hand fabric trimmer

Application Seam Model No.

MF-7900/

H22,23

For hemming

(with left hand fabric trimmer)

MF-7922-H22, H23-B **

MF-7922-H22, H23-B48/MC40

MF-7923-H22, H23-B **

MF-7923-H22, H23-B ** /MC40

MF-7922-H22, H23-B48/UT51, UT57

MF-7922-H22, H23-B48/UT57/MC37

MF-7922-H23-D40/UT59/MC37

MF-7923-H22, H23-B ** /UT51, UT57

MF-7923-H22, H23-B ** /UT57/MC37

MF-7923-H22, H23-B ** /UT59/MC37

Number of needles

2

3

2

3

Number of threads

4

5

4

5

Needle gauge

(mm)

4.0,4.8

4.8

5.6,6.4

4.8

4.0

5.6,6.4

Stitch length *

(mm)

1

0.9~3.6

0.9~3.6

Differentialfeed ratio * 2

1:0.9~1:1.8

(1:0.6~1:1.1)

1:0.9~1:1.8

(1:0.6~1:1.1)

MF-7900D/

H22,23

For hemming

(with left hand fabric trimmer)

MF-7923D-H22, H23-B56

MF-7923D-H22, H23-B56/MC40

MF-7922D-H22, H23-B48/UT57/MC37

MF-7922D-H23-D40/UT59/MC37

3

2

5

4

5.6,6.4

4.8

4.0

0.9~3.6

MF-7923D-H22, H23-B ** -UT51, UT57

MF-7923D-H22, H23-B ** -UT57/MC37

3 5 5.6,6.4

*1 Stitch length can be adjusted to 4.5mm at the maximum. *2 Differential ratio can be switched by adjustment.

*3 The lift of the presser foot is 5mm for the top and bottom coverstitch machine, and 8mm for the bottom coverstitch machine. *4 "sti/min" stands for "Stitches per Minute."

1:0.9~1:1.8

(1:0.6~1:1.1)

Presser foot lifting amount *

(mm)

3

5 (8)

5 (8)

5 (8)

Max. sewing speed

(sti/min)* 4

6,000

6,000

5,000

E11

For elastic band attaching

(with right hand fabric trimmer and tension roller)

Briefs

Boxer briefs

This model is best suited to endless flat elastic band sewing processes for briefs, boxer briefs, etc. The right hand fabric trimmer trims the fabric, even at a multi-layered joined part, to produce a beautiful finish with the seam and fabric edge aligned with consistency. Cloth cutting knife can be detached with one touch operation in case of sewing without using the knife.

List of subclass machines

Application

MF-7900/E11

Elastic band attaching

(with right hand fabric trimmer)

Seam Model No.

MF-7922-E11-B40/PL12/MC40

MF-7923-E11-B ** /PL12/MC40

MF-7923-E11-B ** /PL13/MC40

MF-7913-E11-B56/UT55,UT56/PL12/MC37

MF-7913-E11-B56/UT55/PL13/MC37

MF-7913-E11-B ** /UT56/PL13/MC37

Number of needles

2

3

Number of threads

4

5

4

Needle gauge

(mm)

4.0

5.6,6.4

Stitch length *

(mm)

1

0.9~3.6

Differentialfeed ratio * 2

Presser foot lifting amount *

(mm)

3

1:0.9~1:1.8

(1:0.6~1:1.1)

5 (7)

5.6

5.6,6.4

MF-7900D/E11

Elastic band attaching

(with right hand fabric trimmer)

MF-7913D-E11-B56/UT56/PL13/MC37 3 4 5.6

0.9~3.6

1:0.9~1:1.8

(1:0.6~1:1.1)

5 (7)

*1 Stitch length can be adjusted to 4.5mm at the maximum. *2 Differential ratio can be switched by adjustment.

*3 The numeric value indicates the lifting amount of the presser foot for top and bottom coverstitch. The numeric value given in parentheses indicates the lifting amount of the presser foot for bottom coverstitch.

*4 "sti/min" stands for "Stitches per Minute."

Max. sewing speed

(sti/min)* 4

5,000

5,000

E22

For endless spandex elastic band attaching

(with manual binder and tension roller)

E23

For endless spandex elastic band attaching

(with air binder and tension roller)

Briefs

This model is best suited for sewing elastic bands on briefs.

E22 is opened / closed with the knee lever and E23 is opened

/ closed with the knee switch. The machine comes provided as standard with a tension roller to smoothly sew elastic bands on different-sized garment bodies. The machine flexibly adapts to varying elasticities due to its soft seams.

MF-7923-E22-B56/PL13

List of subclass machines

MF-7923-E23-B56/PL13

Application Seam Model No.

Number of needles

Number of threads

Needle gauge

(mm)

Stitch length *

(mm)

1 Differentialfeed ratio * 2

Presser foot lifting amount *

(mm)

3

MF-7900/

E22,23

For endless spandex elastic band attaching

MF-7923-E22-B ** /PL13

MF-7923-E23-B ** /PL13

MF-7923-E22-B ** /UT52/PL13

MF-7923-E23-B ** /UT57/PL13

3 5 5.6,6.4

0.9~3.6

1:0.9~1:1.8

(1:0.6~1:1.1)

6 (7)

*1 Stitch length can be adjusted to 4.5mm at the maximum. *2 Differential ratio can be switched by adjustment.

*3 The numeric value indicates the lifting amount of the presser foot for top and bottom coverstitch. The numeric value given in parentheses indicates the lifting amount of the presser foot for bottom coverstitch.

*4 "sti/min" stands for "Stitches per Minute."

Max. sewing speed

(sti/min)* 4

5,000

Device

UT51

Electromagnetic needle thread / looper thread trimming device / Auto-lifter

It is an electromagnetic needle thread / looper thread trimming device / Auto-lifter. The machine does not need an air compressor to achieve easy layout changing.

1

UT52

Electromagnetic needle thread / looper thread trimming device / Auto-lifter

It is an electromagnetic needle thread / looper thread trimming device / Auto-lifter with cloth puller.

1

2

2

Electromagnetic needle thread / looper thread trimming device

1

2

Presser lifter drive mechanism magnet

Thread trimmer drive mechanism magnet

UT57

Pneumatic type needle thread / looper thread trimming device / Auto-lifter

It is a pneumatic type needle thread / looper thread trimming device /

Auto-lifter. Since the automatic lift of the presser foot and automatic thread trimming can be activated by lightly depressing the pedal, work efficiency is dramatically increased. The air blow type wiper is supplied with the sewing machine as an accessory.

1

2

Electromagnetic needle thread / looper thread trimming device

1

2

Presser lifter drive mechanism magnet

Thread trimmer drive mechanism magnet

UT55

Pneumatic type bottom thread trimming device

+ Electromagnetic type wiper

/ Auto-lifter

This is a pneumatic type bottom thread trimming device / auto-lifter. It is used for processes which do not need top covering.

UT56

Pneumatic type bottom thread trimming device

+ Air blow type wiper

/ Auto-lifter

This is a pneumatic type bottom thread trimming device / auto-lifter. It pneumatically handles the needle thread (i.e, places the needle thread above the presser foot) instead of the mechanical wiper.

Pneumatic type needle thread / looper thread trimming device

1

2

Presser lifter drive mechanism air cylinder

Thread trimmer drive mechanism air cylinder

UT59 UT59 cannot be attached to the machine as a device.

Please order with the machine head.

Pneumatic type top and bottom thread trimming device with thread-fray-prevention function

It is the state-of-the-art function to make the thread-fray-prevention at the end of sewing more reliable.

SS11

Short stitch device : Part No.70004376

This is a device for preventing the thread from coming undone at the end of sewing. The device is able to sew condensation stitches by the number specified as desired. It prevents the needle thread from being poorly tensed, which is likely to occur in cases where the amount of condensation is reduced.

Air blow type wiper Pneumatic type bottom thread trimming device

PL12

Cloth puller : Gear type

This is a gear type cloth puller. It helps feed difficult-to-feed materials to assist smooth sewing.

(Example: Attaching flat elastic bands)

PL13

Cloth puller : Flat type

This is a flat type cloth puller. It helps feed soft material which requires a higher feeding force to assist sewing.

(Example: Hemming)

The needle thread tightening mechanism helps produce well-tensed seams even when the machine performs short stitching.

The short stitch pitch can be adjusted with ease.

MC37

MC40

Pneumatic cloth chip suction device

MC37 (solenoid valve type) : Part No.40023706,

MC40 (mechanical valve type) : Part No.40023707

WHEN YOU PLACE ORDERS

Please note when placing orders, that the model name should be written as follows:

MF-7900

Without automatic thread trimmer

Stitch type

2-needle, top and bottom coverstitch

3-needle, top and bottom coverstitch

Code

22

23

Tongue shape of throat plate Code

B type B

Needle gauge Code

3.2mm

32

4.0mm

4.8mm

40

48

5.6mm

6.4mm

56

64

*Refer to the subclass models list for the needle gauge of the respective models.

M F 7 9 B /

Universal type

Application

Hemming (with left hand fabric trimmer, for light-weight materials)

Code

U11

H22

Hemming (with left hand fabric trimmer, for medium-weight materials) H23

For elastic band attaching

For wider hemming

E11

H11

For endless spandex elastic band attaching

(with manual binder and tension roller)

E22

For endless spandex elastic band attaching

(with air binder and tension roller)

E23

Device and attachment

Not provided

Pneumatic cloth chip suction device

(mechanical valve type)

Cloth puller: Gear type

Cloth puller: Flat type

Code

MC40

PL12

PL13

With automatic thread trimmer (Direct-drive motor)

Stitch type

3-needle, bottom coverstitch

2-needle, top and bottom coverstitch

3-needle, top and bottom coverstitch

Code

13

22

23

Tongue shape of throat plate Code

B type B

Needle gauge Code

4.8mm

48

5.6mm

6.4mm

56

64

*Refer to the subclass models list for the needle gauge of the respective models.

M F 7 9 B / /

Application

Universal type

Hemming (with left hand fabric trimmer, for light-weight materials)

Hemming (with left hand fabric trimmer, for medium-weight materials)

For elastic band attaching

For wider hemming

For endless spandex elastic band attaching

(with manual binder and tension roller)

For endless spandex elastic band attaching

(with air binder and tension roller)

Code

U11

H22

H23

E11

H11

E22

E23

Thread trimming device

Electromagnetic type top and bottom thread trimming device

Code

UT51

Electromagnetic type top and bottom thread trimming device UT52

Pneumatic type bottom thread trimming device

+ Electromagnetic type wiper

UT55

Pneumatic type bottom thread trimming device

+ Air blow type wiper

Pneumatic type top and bottom thread trimming device

Pneumatic type top and bottom thread trimming device with thread-fray-prevention function

UT56

UT57

UT59

Pneumatic cloth chip suction device (electromagnetic valve type) MC37

Cloth puller: Gear type PL12

Cloth puller: Flat type PL13

Control box

S C - 9 2 1 B

Operation panel

C P - 1 8 B

MF-7900D (Semi-dry-head)

Without automatic thread trimmer

Stitch type

2-needle, top and bottom coverstitch

3-needle, top and bottom coverstitch

Code

22

23

Tongue shape of throat plate Code

B type B

Needle gauge Code

4.0mm

40

5.6mm

6.4mm

56

64

*Refer to the subclass models list for the needle gauge of the respective models.

M F 7 9 D B

Universal type

Application

Hemming (with left hand fabric trimmer, for light-weight materials)

Code

U11

H22

Hemming (with left hand fabric trimmer, for medium-weight materials) H23

/

Device and attachment

Not provided

Pneumatic cloth chip suction device

(mechanical valve type)

Code

MC40

With automatic thread trimmer (Direct-drive motor)

Stitch type

3-needle, bottom coverstitch

2-needle, top and bottom coverstitch

3-needle, top and bottom coverstitch

Code

13

22

23

Tongue shape of throat plate Code

B type B

D type D

M F 7 9 D / /

Needle gauge Code

4.0mm

4.8mm

40

48

5.6mm

6.4mm

56

64

*Refer to the subclass models list for the needle gauge of the respective models.

Application

Universal type

Hemming (with left hand fabric trimmer, for light-weight materials)

Hemming (with left hand fabric trimmer, for medium-weight materials)

For elastic band attaching

Code

U11

H22

H23

E11

Thread trimming device

Electromagnetic type top and bottom thread trimming device

Pneumatic type bottom thread trimming device

+ Air blow type wiper

Pneumatic type top and bottom thread trimming device

Code

UT51

UT56

UT57

Pneumatic type top and bottom thread trimming device with thread-fray-prevention function

UT59

Pneumatic cloth chip suction device (electromagnetic valve type) MC37

Cloth puller: Flat type PL13

Control box

S C - 9 2 1 B

Operation panel

C P - 1 8 B

SPECIFICATIONS (U11, H11, H22, H23, E11, E22, E23)

Model name

Stitch type

Needle

Lift of the presser foot

Stitch pitch adjustment

Differential feed adjustment

Lubrication

Lubricating oil

Feed dog inclination adjustment

Micro-lifter

Needle gauge (mm)

MF-7900 series

2-needle/3-needle top and bottom covering stitch

MF-7900D series

2-needle/3-needle top and bottom covering stitch

UY128GAS (#10S) #9~#12S

5mm (with top and bottom covering stitch),

8mm (with bottom covering stitch)

By dial

By micro-adjustment mechanism

Automatiac Automatic (frame: no lubrication)

JUKI Machine Oil 18 (equivalent to ISO VG18)

Provided as standard

Provided as standard

3.2, 4.0, 4.8, 5.6, 6.4

U11, H11, H22, H23, E11 : Provided as standard: 31mm: at the time of delivery /

When sewing a heavy-weight material: 33mm ※

Needle bar stroke converting function E22, E23 : Provided as standard: 33mm: at the time of delivery /

When sewing a heavy-weight material: 35mm

Silicon oil tank for needle tip and needle thread

Cartridge oil filter

Power requirement /

Power consumption

Weight of the machine head

U11

H11 (with PL) ※

E22, E23 (with PL)

E11 (with PL)

H22, H23

※ "H11" excepts MF-7900D Series.

Provided as standard

Provided as standard

Single-phase 100~120V / 200~240V,

3-phase 200~240V / 500VA (with automatic thread trimmer)

41kg (without device), 49kg (with UT51), 51kg (with PL/UT52), 44kg (with UT57)

43kg (without device), 51kg (with UT52), 46kg (with UT57)

43kg (without device), 51kg (with UT52), 46kg (with UT57)

44kg (without device), 48kg (with UT55), 47kg (with UT56)

42kg (without device), 50kg (with UT51), 45kg (with UT57)

Compressedair / Air consumption

(with automatic thread trimmer)

Device

Top and bottom thread trimmer

Auto-lifter

Bottom thread trimmer

Auto-lifter

Air blow type wiper

MC37

MC40

UT55

UT56

UT57, UT59

Air consumption dm 3 /min (ANR)

Compressed air

MPa

456

182

637

0.7

182

456

637

0.5

0.5

0.5

JUKI ECO PRODUCTS

The MF-7923U11B56/UT57 is an eco-friendly product which complies with

JUKI ECO PRODUCTS standards for protecting the environment.

This sewing machine reduces power consumption by 27% as compared with the conventional models.

The sewing machine complies with the "Juki Group Green Procurement Guidelines" on the use of hazardous substances, which is stricter than other restrictions, such as those of the RoHS Directive.

For details of JUKI ECO PRODUCTS, refer to : http://www.juki.co.jp/eco_e/index.html

The RoHS Directive is an EU Directive limiting the use of 6 hazardous substances (lead, hexavalent chromium, mercury, cadmium, PBB and PBDE) in electrical and electronic equipment.

The Juki Green Procurement Guideline is the voluntarily established criteria to eliminate not only the aforementioned six substances, but also other ones which also adversely affect the environment.

Juki Corporation operates an environmental management system to promote and conduct the following as the company engages in the research, development, design, sales, distribution,and maintenance of industrial sewing machines, household sewing machines, industrial robots, etc., and in the provision of sales and maintenance services for data entry systems:

(1) The development of products and engineering processes

that are safe to the environment

(2) Green procurement and green purchasing

(3) Energy conservation (reduction in carbon-dioxide emissions)

(4) Resource saving (reduction of papers purchased, etc.)

(5) Reduction and recycling of waste

(6) Improvement of logistics efficiency (modal shift and

improvement of packaging, packing, etc.)

2-11-1 , TSURUMAKI, TAMA-SHI,

TOKYO 206-8551 , JAPAN

PHONE : (81) 42-357-2254

FAX : ( 81 ) 42-357-2274

SEWING MACHINERY BUSINESS UNIT 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 catalogue prints with environment-friendly soyink on recycle paper.

SEPTEMBER, 2013 Printed in Japan(C)

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Key Features

  • Improved seam quality with new feed mechanism, differential-feed micro-adjustment mechanism, and looper thread twining prevention mechanism
  • High-speed operation with a maximum sewing speed of 5,000sti/min
  • Semi-dry-head technology eliminates oil stains on sewing products
  • Direct-drive motor for swift startup, increased stop accuracy, and reduced power consumption
  • Easy maintenance with externally-mounted looper thread cam and simplified maintenance mechanism
  • Needle bar stroke conversion mechanism for adjusting penetrating force and thread tension for heavy-weight materials
  • Front cover trimmed to allow operators to bring their hands closer to the needle entry area for increased work efficiency

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Frequently Answers and Questions

What are the advantages of the JUKI MF-7900 series coverstitch machine?
Improved seam quality, enhanced responsiveness to various materials, simplified maintenance, direct-drive motor for increased responsiveness and reduced power consumption, and looper thread twining prevention mechanism as standard.
How does the MF-7900 series improve seam quality?
It features a new feed mechanism, differential-feed micro-adjustment mechanism, and a micro-lifter mechanism to reduce slippage, warpage, and damage to delicate materials.
What is the purpose of the differential-feed micro-adjustment mechanism?
It allows for precise adjustment of the differential feed amount to suit different materials, ensuring consistent stitch quality even when changing stitch length.
How does the looper thread twining prevention mechanism work?
In case of looper thread breakage, the mechanism trims the thread before it can twine on the looper thread cam, preventing potential issues and improving maintainability.
What is the benefit of the direct-drive motor in the MF-7900 series?
The direct-drive motor provides swift startup, increased stop accuracy, eliminates belt shavings, and reduces power consumption by 27% compared to conventional models.

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