Adoption of the direct-drive mechanism enhances energy conservation and workability, and increases the needle’s material penetrating force.
- Energy-saving – Reduced by 21%
Adoption of a compact motor for the direct-drive mechanism and the newly developed control box (SC-920A*) decrease power consumption by approximately 21%.
Adoption of the direct-drive mechanism improves stop accuracy and responsiveness, leading to increased working efficiency.
- Material penetrating force – Increased by 32%
Adoption of a high-torque type 550W motor promises added material penetrating force when the sewing machine sews multi-layered parts of heavy-weight material.
* The newly-developed control box SC-920A is the first control box to come with a power saving mode for the sewing machine and to withstand voltage fluctuations, noise and vibration.
Direct-drive sewing machine with automatic thread trimmer
- LH-3528A-7 (standard hooks)
- LH-3578A-7 (large hooks)
- LH-3568A-7 (standard hooks, with organized split needle bar)
- LH-3588A-7 (large hooks, with organized split needle bar)
The LH-3500A Series has made further progress. This is the cutting-edge model 2-needle sewing machine which comes with substantially enhanced mechanisms such as the direct-drive mechanism, semi-dry head, new thread tension control mechanism and improved oiling system.
A semi-dry head is now installed in all of the models of the LH-3500A Series.
All models of the LH-3500A Series are provided with a semi-dry head to eliminate staining with oil from the frame (the needle bar part). The semi-dry head sewing machine with organized split needle bars is only available from JUKI. The sewing machine with organized split needle bars is the only sewing machine in the industry that comes with the semi-dry head. It helps reduce poor-quality products due to oil stains even in the case of product items which have corner stitching sections.
The “large-hook type” uses a hook 1.7 times larger than standard. This increase in size reduces the frequency of bobbin-thread changes.
The sewing machine has been designed to eliminate waste time and the operator’s stress.
Without thread trimmer
- LH-3528A (standard hooks)
- LH-3578A (large hooks)
- LH-3568A (standard hooks, with organized split needle bar)
- LH-3588A (large hooks, with organized split needle bar)
The drive method is the V-belt method by means of an externally-mounted motor.
A thread tension control mechanism has been developed for each type of sewing machine in order to achieve the best-suited thread tension for its purpose. The sewing machine for jeans and heavy-weight materials (G type) produces well-tensed seams by the optimization of the feed mechanism. Furthermore, the G type machine comes with the new thread trimmer mechanism which promises increased reliability.
The best-suited thread tension is achieved according to the sewing specifications (Unique to JUKI)
Two different types of thread tension controllers have been developed.
The needle tension controller comes in two different mechanisms according to the type of sewing machine. For the A and F types, seam quality free from puckering and irregular stitches is promised. For the S and G types, the sewing range has been broadened to produce well-tensed seams even when thick thread is used.
Wire type and round-hole type needle bar thread guide
Two different kinds of needle bar thread guides (needle clamps), the wire type and round-hole type, have been developed according to the type of sewing machine. The wire-type needle bar thread guide has been adopted for the A and F types which require the sewing capability to sew light-weight materials and foundations without puckering or irregular stitches. The round-hole type needle bar thread guide has been adopted for the S and G types which sew materials requiring well-tensed seams. In addition, the G type is provided as standard with the presser foot with guide which is effective for the top stitching process.
Highly reliable thread-trimming mechanism
Our direct-acting thread trimmer mechanism, which spreads thread without fail, has been further improved. The thread trimmer trims the needle thread and bobbin thread without fail even when thick thread is used. In addition, the thread trimmer’s bobbin thread retaining force has been increased.
Material-friendly micro-lifter mechanism
The presser foot can be lifted by a minute amount by adjusting the eccentric pin located in the presser lifter lever section. When sewing shaggy and elastic fabrics, the load applied to the material is reduced by slightly lifting the presser foot. Materials are handled more easily and are finished without sacrificing the inherent texture of the material.
The internal mechanism of the sewing machine has been thoroughly re-investigated to achieve further improvement of maintainability and workability. JUKI does not cut corners on the quality of those parts which are normally invisible, such as in the internal section of the sewing machine. This represents JUKI’s craftsmanship.
The feed method can be easily changed over
The location of the oil tank has been changed to the inside of the sewing machine through our re-investigation of the lubricating method. As a result, space is secured under the bed surface to facilitate changeover of the feed method between the “needle feed” and “bottom feed” and changeover of the feed timing (re-placement of the timing belt).
Changeover between the needle feed and bottom feed
For the process of sewing light-weight materials or the like, puckering has to be prevented. In this case, the feed method can be changed over to the bottom feed through an easy adjustment and change of the gauge. In comparison with the needle feed, the bottom feed works to prevent puckering and enables sewing with a lower thread tension.
Two selectable new-method oiling mechanisms (Unique to Juki)
Eco-oil method (circulation type)
The oil dropped from the hook and its surrounding sections into the under-cover is filtered to remove dirt and dust and is then returned to the oil tank. This method saves the effort of oiling and reduces oil consumption.
Clean oil method
The oil dropped from the hook and its surrounding sections into the under-cover is not returned to the oil tank, but only clean oil is supplied to the hook at all times.
*The oiling method can be changed over as desired.
Gauge for tape attaching (corresponding attachment classification code “T” for tape attaching; LH-3528A-F: Only the sewing machine for foundation)
Gauge for tape attaching (corresponding attachment classification code “T” for tape attaching; LH-3528A-F: Only the sewing machine for foundation) The sewing machine is provided as standard with the gauge for tape attaching which is best-suited to the process for attaching tape to foundation. The gauge for tape attaching consists of the throat plate for tape attaching, presser foot with guide and bed slide. The sewing machine with the standard gauge can be changed to the tape attaching type sewing machine by changing the gauge with the gauge for tape attaching.
|Throat plate for tape attaching
The throat plate is designed with a hollow on the side facing the operator. This hollow helps smooth the feeding of tape.
|Slide plate (this side) : Part No. 23206709
This reduces the height when the tape-attaching holder is fixed on the machine.
Production support function
The operation panels CP-18A and CP-180A are provided with a production support function.
The production support function actually consists of three different functions (six different modes), which are the output control function, operation measuring function and bobbin counter function. Each with its own production support effect. An appropriate function (mode) can be selected as required. The parameter setting can be done on the panel located on the top of the sewing machine, thereby helping reduce operator fatigue during setup changing.
Output control function
- Target No. of products display mode
Under the target No. of products display mode, the target number of products and the actual number of products produced according to the work hours are displayed.
- Target-actual result difference display mode
In the under target-actual result difference display mode, the difference between the target number of products and the actual number of products produced is displayed. Since operators are able to work while checking their actual number of products on the panel at all times, they can strengthen their sense of purpose of achieving the target, thereby increasing productivity. Operators can visually check the progress of their work in real time, leading to the early detection of any problems and the execution of early corrective measures.
Operation measuring function
- Sewing machine availability display mode
Under the sewing machine availability display mode, the average sewing machine availability in the previous cycle and the current cycle is displayed.
- Pitch time display mode
Under the pitch time display mode, the average process machining time in the previous cycle and the current cycle is displayed.
- Average speed of stitch display mode
Under the average speed of stitch display mode, the accumulated speed of stitch in the previous cycle and the current cycle is displayed. Since the sewing machine operation status, pitch time (process machining time), can be automatically measured, process analysis, line arrangement and confirmation of facility efficiency can be obtained with ease. As a result, the man-hours required for production control are reduced.
Bobbin counter function
- Bobbin counter display mode
The operator is notified that the bobbin needs to be replaced before the bobbin thread runs out. Since the operator is notified of the time to replace the bobbin, the operator is no longer required to carry out the re-sewing of seams sewn without bobbin thread, thereby increasing working efficiency. In addition, the operator carries out his/her work under a stress-free environment without worrying about needle-hole damage to the material, which is likely to be made when sewing without bobbin thread.
|Medium-weight||Jeans and heavy-weight|
needle bar mechanism
|Not provided||Provided as standard||Not provided||Provided as standard|
|Hook||Vertical axis regular hook||Vertical axis 1.7 times large hook|
|Lubrication||Semi-dry/ hook section: minute-quantity lubrication (tank system)|
|Max. sewing speed||3,000sti/min|
needle to machine arm
|120mm(H) × 266mm (W) × 87mm (height of jaw part)|
|Feed system||Changeover between the needle feed and bottom feed||Needle-feed|
|Max. stitch length||5mm||4mm||5mm|
|Needle bar stroke||33.4mm|
|Thread winder||Built-in the machine head|
|Lift of the presser foot||7mm (by hand), 13mm (by knee)|
|Oiling method||Eco-oil method (circulation type), Clean oil method|
|Lubricating oil||JUKI New Defrix Oil No.1 (equivalent to ISO VG7)|
|DP×5(#14) #9~#16||DP×5(#21) #16~#23||DP×5(#21) #16~#23||DP×5(#21)
of package (mm)
|LH-3528A/3568A/3578A/3588A: 718mm (H) × 341mm (W) × 744mm (L)
LH-3528A-7/3568A-7/3578A-7/3588A-7 : 768mm (H) × 341mm (W) × 744mm (L)
weight (including the package)
LH-3528A-7/3568A-7/3578A-7/3588A-7: 61kg (with AK: 63kg)
LH-3528A-F-0B : 50kg (with AK: 63kg)
When you place orders
Motor Selection Belt Table (for sewing machines without thread trimmer)
|Sewing speed (sti//min)||Motor pulley||Belt|
|50Hz||60Hz||Outside diameter (mm)||Part No.||Length (inch)||Part No.|
The table shown above represents the case of the clutch motor with an output power of 400W (2P). The V belt should be used with the clutch motor.