Juki MF-7900 Series

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

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The Juki 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 Juki MF-7900 Series is provided as standard with a looper thread twining prevention mechanism for improved maintenance.

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.

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 length is changed.


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 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.

Model Number Juki MF-7900 Series Juki MF-7900D series
 Stitch type  2-needle/3-needle top and bottom covering stitch  2-needle/3-needle top and bottom covering stitch
 Needle  UY128GAS (#10S) #9~#12S
 Lift of the presser foot  5mm (with top and bottom covering stitch),
8mm (with bottom covering stitch)
 Stitch pitch adjustment  By dial
 Differential feed adjustment  By micro-adjustment mechanism
 Lubrication Automatic  Automatic (frame: no lubrication)
 Lubricating oil  JUKI Machine Oil 18 (equivalent to ISO VG18)
 Feed dog inclination adjustment  Provided as standard
 Micro-lifter  Provided as standard
 Needle gauge (mm)  3.2, 4.0, 4.8, 5.6, 6.4
 Needle bar stroke converting function  U11, H11, H22, H23, E11 : Provided as standard: 31mm: at the time of delivery / When sewing a heavy-weight material: 33mm
 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  Provided as standard
 Cartridge oil filter  Provided as standard
 Power requirement / Power consumption  Single-phase 100~120V / 200~240V, 3-phase 200~240V / 500VA (with automatic thread trimmer)
 Weight of the machine head  U11  41kg (without device), 49kg (with UT51), 51kg (with PL/UT52), 44kg (with UT57)
 H11 (with PL) ※  43kg (without device), 51kg (with UT52), 46kg (with UT57)
 E22, E23 (with PL)  43kg (without device), 51kg (with UT52), 46kg (with UT57)
 E11 (with PL)  44kg (without device), 48kg (with UT55), 47kg (with UT56)
 H22, H23  42kg (without device), 50kg (with UT51), 45kg (with UT57)

For all Industrial Sewing Machine Spare Parts, Needles & Accessories, click the link below to our Parent company, College Sewing Machine Parts Ltd, the UK’s largest Industrial Sewing Machine Spare Parts Stockist. Juki Industrial Parts Agents, sewing machine parts for the Juki MF-7900 Series

Juki MF-7900 Series Spare Parts

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