MACHINE NAME: DOUBLE NEEDLE LOCKSTITCH SEWING MACHINE  

MODEL NO: SB-842/872

BRAND: SHIBANG

FEATURES

• New auto thread cutting design and the auto reverse feed effectively improving the stitching quality and efficiency.
• Needle threader eyelet group to refer to different demands any change, increasing use of convenience. automatic lubrication system, running smooth noise are easy to maintain.

TECHNICAL PARAMETER

1. Model                      : SB-842/872
2. Sewing speed           : 3000-4000rpm/3000rpm
3. The foot to promote : 7/7mm
4. Max. needle pitch    : 4-5/7mm
5. Needle                    : DPx5(#11/14/22)/DPx5(#22)

The Shibang-842 / 872 Double Needle Sewing Machine represents an advanced industrial sewing solution meticulously designed to meet the demanding requirements of the footwear industry, leather goods manufacturing, and heavy-duty fabric applications. Renowned for its robustness, precision, and versatility, this machine offers exceptional double-needle stitching capabilities that ensure enhanced seam strength and aesthetic quality, critical for high-performance products. Built with modern manufacturing environments in mind, the Shibang-842 / 872 delivers reliable, efficient, and high-speed stitching that maximizes factory productivity while maintaining consistent stitch quality. Whether sewing tough leather uppers or delicate synthetic fabrics, this machine is engineered to handle diverse materials with ease, helping manufacturers optimize production workflows and reduce operational costs.

Core Features and Functional Highlights

Precision Double Needle Stitching for Superior Seam Strength

The Shibang-842 / 872 is equipped with two needles operating simultaneously to create perfectly aligned parallel stitches. This double-needle configuration strengthens seams considerably compared to single-needle stitching, making it ideal for footwear uppers, bags, leather goods, and upholstery applications where durability is paramount. The machine’s engineering ensures precise needle synchronization and stable penetration depth, eliminating skipped stitches and thread breaks. This is particularly important when stitching materials prone to shifting or stretching during the sewing process.

Wide Material Compatibility

One of the standout features of the Shibang-842 / 872 is its ability to sew an extensive range of materials. From genuine and synthetic leather to canvas, rubber sheets, denim, and industrial textiles, the machine can seamlessly switch between material types without sacrificing stitch quality. Its robust feed mechanism and motor torque allow it to manage thick and multi-layered fabrics, giving manufacturers the flexibility to use a single machine across multiple product lines. This versatility lowers capital investment needs and simplifies factory layout.

High-Efficiency Industrial Motor

Powered by a high-performance 3HP motor, the Shibang-842 / 872 achieves impressive stitching speeds without compromising precision. The motor is engineered for continuous operation under industrial conditions, delivering stable and vibration-free sewing even during extended production runs . High sewing speed combined with reliable operation boosts throughput, making this machine suitable for large-scale manufacturing where uptime and speed directly influence profitability.

Intuitive Operation and Easy Adjustability

Designed with the operator in mind, the Shibang-842 / 872 features accessible and clearly labeled adjustment controls. Operators can easily modify stitch length, needle position, presser foot pressure, and thread tension to suit different materials and design specifications. Quick threading paths and straightforward maintenance procedures minimize downtime, allowing workers to maintain consistent production flow. The ergonomic layout reduces operator fatigue and enhances safety during prolonged use.

Durable Construction for Long-Term Use

The machine’s frame and components are manufactured from high-quality cast iron and steel alloys, ensuring excellent structural stability and resistance to wear. This heavy-duty construction supports high-torque operation, essential when working with tough materials. The internal mechanisms are precision-machined to tight tolerances, reducing mechanical wear and noise. This durability extends the machine’s service life and lowers long-term maintenance expenses.

Optional Automation Features for Enhanced Productivity

For factories aiming to implement automated workflows, the Shibang-842 / 872 can be equipped with advanced optional features. These include automatic thread trimming, electronic stitch counters, programmable stitch patterns, and integration with factory IoT systems for real-time monitoring and control. Such automation reduces manual intervention, enhances production consistency, and supports data-driven process optimization in modern smart factories.

Benefits and Operational Advantages

Increase Production Efficiency

With its dual-needle system and high-speed motor, the Shibang-842 / 872 reduces the number of stitching passes needed, significantly accelerating assembly times. The efficient feed mechanism maintains smooth fabric advancement, minimizing fabric jams and interruptions. These factors collectively increase the number of finished units per hour, enabling manufacturers to meet high-volume orders without compromising on quality.

Enhanced Seam Quality and Product Reliability

Double-needle stitching inherently produces stronger and more durable seams. The Shibang-842 / 872 ensures perfect needle alignment and tension control to create clean, evenly spaced stitches that enhance both the structural integrity and visual appeal of finished products . This improves product lifespan, reduces return rates, and builds brand reputation for quality.

Reduce Labor Requirements

The machine’s simple setup and adjustment features reduce the time required for operator training and intervention. Its stable operation decreases thread breakage and machine stoppages, minimizing the need for frequent supervision. Moreover, the option for automation features further decreases labor dependency, allowing skilled operators to oversee multiple machines simultaneously.

Versatile Applications Across Industries

Thanks to its adaptable design, the Shibang-842 / 872 serves a broad range of production needs:

• Footwear Manufacturing: Produces sturdy upper seams, lining attachment, and component stitching for casual, formal, and sports shoes.

• Leather Goods: Used in manufacturing handbags, wallets, belts, and luggage, providing consistent and durable seams.

• Automotive and Upholstery: Handles thick leather and fabric panels for car seats, furniture upholstery, and industrial coverings.

• Industrial Textile Production: Suitable for sewing heavy-duty tarps, workwear, and protective clothing materials.

Technical Specifications Overview

• Model: Shibang-842 / 872

• Motor: 3HP high-efficiency industrial motor for high-speed stitching

• Needle Setup: Double needle, synchronized for parallel stitching

• Stitch Length Adjustment: Adjustable range typically between 2mm to 6mm

• Feed Mechanism: Walking foot feed system optimized for thick and multi-layer materials

• Max Sewing Speed: Up to 3000 stitches per minute (material dependent)

• Voltage: Standard 220V (customizable as per factory requirements)

• Machine Dimensions: Approximately 1200 mm length × 700 mm width × 1200 mm height

• Weight: Around 180 kg to ensure stability during operation

• Compatible Materials: Leather, synthetic leather, canvas, rubber sheets, denim, industrial textiles

Installation and Operation Guidelines

Machine Setup

Ensure that the Shibang-842 / 872 is placed on a stable, vibration-free surface and connected to a power supply meeting the specified voltage and frequency requirements. Proper grounding is essential to avoid electrical hazards. Adjust stitch length, thread tension, and presser foot pressure according to the material being sewn. Use recommended needle sizes and thread types for best results.

Threading and Needle Installation

Follow manufacturer guidelines for correct needle insertion and thread routing. Proper threading reduces thread breakage and ensures consistent stitch formation. Double-needle machines require careful synchronization of needles and thread paths to avoid tangling and missed stitches.

Regular Maintenance

Routine cleaning to remove lint, dust, and material residues from the feed dogs, bobbin area, and needle bar is essential. Lubricate moving parts according to the maintenance schedule provided in the user manual to maintain smooth operation and prevent premature wear. Check needles regularly for bending or blunt tips and replace them as necessary to maintain stitch quality.

Troubleshooting Common Issues

• Skipped Stitches: Often caused by improper needle alignment or damaged needles; check needle installation and replace if necessary.

• Thread Breakage: May result from incorrect thread tension or poor-quality thread; adjust tension settings and use high-quality threads.

• Material Feeding Problems: If fabric feeding is uneven or erratic, inspect the walking foot and feed dog condition, cleaning and adjusting as needed.

• Excessive Noise or Vibration: Could indicate loose components or worn bearings; perform thorough inspection and tighten or replace parts as required.

Why Choose the Shibang-842 / 872 Double Needle Sewing Machine?

The Shibang-842 / 872 double needle sewing machine is a reliable, efficient, and durable solution designed to meet the complex stitching needs of modern manufacturing. Its advanced engineering ensures consistent, high-quality seams for a wide range of materials and applications, making it a versatile asset for footwear manufacturers, leather goods producers, and textile fabricators. Investing in this machine offers tangible benefits such as improved production speed, enhanced seam durability, reduced labor costs, and operational flexibility. Whether you are expanding your production capacity or upgrading existing equipment, the Shibang-842 / 872 delivers exceptional value and long-term performance.