The Backbone of Any Factory: Lockstitch (Flatbed)

The Backbone of Any Factory: Lockstitch (Flatbed)

The lockstitch machine is the true workhorse of any production line. It creates the strongest, most common stitch, perfect for joining main garment parts like side seams, inseams, and topstitching.

• Key Feature: High speed (4,000–6,000 SPM) for maximum output; Direct-Drive Servo Motor for energy savings (up to 70%) and quiet operation.

• Consider: Standard lockstitch for general seams; cylinder-bed for sleeves/cuffs; automatic for high-volume work.

Explore DOIT Lockstitch Series:

• Standard Lockstitch (DT 5550): An economical choice for daily assembly of medium-weight materials, with automatic oil supply.

• Direct Drive with Auto-Trimmer (DT8800-D4): A fully automatic lockstitch with a touchscreen and 550W direct-drive motor that handles heavy fabrics up to 5mm thick, significantly boosting productivity.

• Double Needle Lockstitch (DT 842D): Creates two parallel rows of stitching simultaneously for decorative topstitching (e.g., on jeans) at speeds up to 5,000 SPM.

• Advanced Computerized Lockstitch (DT C10-D4): Features a stepper motor for precise stitch control and computerized functions for consistent quality on any fabric.

✂️ The Finishing Touch: Overlock (Serger)

The overlock machine gives garments their professional, store-bought quality. It's responsible for giving t-shirts their clean, stretchable seams and preventing raw fabric edges from fraying.

• Key Feature: Trims and finishes the fabric edge within the seam in one operation (up to 7,000 SPM); perfect for woven and stretch knit fabrics.

• Consider: 3-thread for light fabrics, 5-thread for strong safety seams; 3/4-thread overlockers for general T-shirt work and light pants.

Explore DOIT Overlock Series:

• Standard Overlock (DT 940-4AT): An excellent starter machine for small garment businesses, offering 4-thread versatility for professional edge finishing.

• Computerized Overlock (DT-5200EX-5AT): A high-efficiency 5-thread, 4-line overlock with automatic thread trimming (5% lower energy use).

• High-Speed Overlock: Designed for high-volume mass production, delivering clean finishes on a wide variety of fabrics at exceptional speeds.

✅ The Specialist for Knits: Coverstitch

For modern knitwear production, the coverstitch is essential. It creates the professional, two-needle hems seen at the bottom of t-shirts and around the necklines of sportswear.

• Key Feature: Professional hems on sleeves/bottoms; Chainstitch gives great elasticity for seamless finishes.

• Consider: 2/3-needle for standard hems; differential feed for stretch fabrics; 3/5 thread as coverstitch/base.

🔗 For Unmatched Strength & Durability: Chainstitch

When you need a seam that can withstand high stress, chainstitch is the superior choice. It creates an elastic, "braided" stitch perfect for waistbands, denim hems, decorative stitching, or quilts.

• Key Feature: Elastic seam for strong waistbands; Multi-needle for 5-10mm belt loops; Super strength for industrial durability.

Explore DOIT Chainstitch Series:

• Multi-Needle Double Chainstitch (DT 1508P Series): The industry benchmark for waistband and heavy hemming, using 4 needles (8 threads) to deliver durable, stretchable seams at up to 4,500 SPM.

🛋️ For Extreme Materials: Heavy-Duty & Walking Foot

When your production shifts to automotive interiors, heavy upholstery, thick leather, or multiple layers of denim, a standard lockstitch won't be enough. A heavy-duty machine with a walking foot is the solution.

• Key Feature: Walking foot mechanism moves in sync with bottom feed to prevent layers from shifting; High clearance for up to 14mm thickness; High torque motor to push through dense materials.

• Consider: Walking foot for tough multi-layer materials; 2/3-needle as consistent as 3-thread hemming.

🧩 The Right Tool for Every Specialized Job

A complete, efficient assembly line often requires machines for very specific tasks. DOIT's specialized series is designed to fill these crucial gaps, ensuring your production process is seamless and your final product quality is top-tier.

• Button Attacher (DT1377D): An industrial-grade machine designed for heavy-duty button attachment on thick fabrics (up to 14mm), such as jeans and leather jackets, ensuring secure, long-lasting seams.

• Multi-function Zigzag (DT-20U Series): Perfect for decorative stitching, appliqué work, and darning, ideal for garment shops and manufacturers needing versatility for a range of materials.

• Feed-Off-the-Arm (DT9270): Specially designed for sewing cylindrical items like cuffs and sleeves, or for hemming tasks where a flatbed machine is difficult to use.

🧵 Beyond the Machine: Needles, Thread & Presser Feet

Choosing the correct consumables for your machine is as important as the machine itself. To help you make the right match for your materials, here are quick-reference guides:

1. Needle Selection Matrix (135x17 System)
Use this guide to match your needle to the fabric you'll be sewing most often:

2. Thread Tension by Material
Proper tension ensures the lock stitch is perfectly balanced within the material layers:

3. Standard Presser Foot Applications
Different presser feet are designed for different tasks. Here's a quick guide:

💧 Maintenance at a Glance

• Daily: Clean lint; check oil level; wipe dust.

• Weekly (per 40 hrs): Deep clean hook compartment; tighten screws; inspect for wear.

• Monthly: Change oil filter; check timing; clean feed dogs/tension disks.

💎 The DOIT Advantage: A Complete Production Line Partner

For a small garment business, sourcing from a single, reliable manufacturer for a full production line is much more efficient than dealing with multiple suppliers.

DOIT Group stands out because it is a true manufacturer (not just a trader), meaning better prices and quality control. With ISO9002 certification for quality and CE/TUV/UL for safety, all machines are export-ready. With over 200,000 sets produced annually for 20+ countries, you're partnering with a proven, global supplier.

Many of its models feature direct-drive servo motors that help your business save up to 70% on electricity. And with a warranty covering parts for 1 year and the motor for 2 years (with video/online support), your investment is well protected.

Building your dream garment business starts with the right equipment.

Ready to build your production line? Contact the DOIT Group sales team for a free consultation, request a customized quote, or ask for our full product catalog.

📩 Email: sales6@chinadoit.cn
🌐 Website: doitsewingmachine.com