Product Overview

The JUKI LBH-1790A Series is a computer-controlled, high-speed, lockstitch buttonholing machine . It is designed for high productivity and superior seam quality. The series is the successor to previous models, featuring a dry-head mechanism and digitalized drive mechanisms for precise management of sewing patterns . It is suitable for various applications, including men's shirts, blouses, workwear, and ladies' clothing .

Key Specifications

Key Features

1. High Productivity

The machine achieves a maximum sewing speed of 4,200 stitches per minute (sti/min) and a jump speed of 200 mm/s, significantly reducing cycle time for continuous sewing . It supports cycle sewing (registering 20 programs with up to 15 patterns each) and continuous sewing (sewing 2 or more different patterns without lifting the work clamp) .

2. Digitized Drive Mechanisms

All drive mechanisms (material feed, needle feed, thread trimming, presser lifter) are electronically controlled by stepping motors. This digitalization allows operators to set, adjust, and store all settings via the operation panel for perfect repeatability .

3. Active Tension System (Electronic Thread Tension)

JUKI's unique active tension system allows separate control of needle thread tension for the parallel and bartacking sections of the buttonhole. This ensures a beautiful buttonhole shape and helps prevent thread breakage . It also prevents unthreading at the start of sewing .

4. Versatile Buttonhole Styles

The machine supports a wide variety of buttonhole types, including square, round, radial, and bridal types. It allows easy changeover between purl stitch and whip stitch .

5. Multiple Knife-Dropping Function

This function eliminates the need to change the knife when altering buttonhole sizes. The number of knife drops is automatically set according to the buttonholing size, which is ideal for small-lot productions or cycle sewing of different sizes .

6. Operator-Friendly Environment

• Direct-Drive Motor: Ensures quieter operation .

• LED Light: An adjustable LED light is standard on the underside of the arm jaw, illuminating the sewing area .

• Auxiliary Table: A standard accessory that makes it easier to place sewing products .

• Pedal System: The machine features a newly developed stepping motor auto-lifter. It supports both one-pedal and two-pedal models with adjustable intermediate stop positions to reduce operator fatigue .

7. Basting Stitch Mechanism

This mechanism is highly effective for elastic materials like knits. It prevents the material from stretching and ensures the buttonhole seams lie flat without the needle thread sticking out .