A core solution for stable stitches and increased automated sewing capacity.
Compatible with computerized pattern sewing machines, this machine is specifically designed for automated pattern sewing of medium-thick materials such as bag webbing, leather belts, workwear reinforcement, and lifting slings. The secondary thread clamp device solves the pain point of uncontrolled tension in heavy-duty sewing, providing a one-stop solution to improve stitch quality and workshop production efficiency.
I. Industry Pain Point
The fatal flaw of traditional single-thread clamping structures in heavy-duty pattern sewing machines.
For example, the KINGMAX GT210E computerized pattern sewing machine has a maximum speed of 2800 SPM, primarily for free-form pattern sewing and bar-stitching processes on heavy materials such as multi-layer leather, thickened webbing, canvas, and seat belts. In large-scale automated continuous operations, the original single-thread clamping structure is prone to the following production problems:
1. Severe tension fluctuations in multi-layer thick materials
With 3-8 layers of leather and thickened webbing, the penetration resistance is high. During high-speed sewing, the tension of the top thread fluctuates greatly. The single thread clamp cannot maintain stable pressure, resulting in floating thread, beading, bird's nest at the bottom thread, loose thread take-up, uneven stitches on the finished product, and large-scale rework that wastes thread and time.
2. Uncontrolled thread length at the start of seams and after thread trimming
Automated continuous cyclic pattern sewing can lead to thread loosening at the start of seams and excessively long thread ends after trimming, requiring manual trimming and disrupting the automated production line. Skipped stitches and thread breaks are more likely to occur when sewing with thicker threads.
3. Poor compatibility with thick/extra-thick threads
In thick material scenarios, DP×17#18 thick needles are commonly used with high-strength thick thread. The single-thread clamping force is insufficient, resulting in unbalanced take-up force, leading to thread breakage and loose stitches in high-density patterns such as bar stitching and reinforcement. 4. Frequent machine adjustments, increasing labor costs: Changing materials or thread diameters requires repeated adjustments to the thread tension. Skilled technicians spend a lot of time adjusting the machines, significantly reducing equipment uptime and limiting per capita factory productivity.
II. Secondary Thread Tightener Working Principle
Dual-stage dynamic thread locking, adapted to the automated sewing logic of pattern machines. As an upgrade to the pattern machine head, the secondary thread tightener is installed between the original thread clamping channels. It is linked and matched with the large rotary hook and Dahao electronic control system, providing precise thread control in two stages, perfectly adapting to computerized pattern machines.
1. First-stage pre-clamping and stabilizing pressure: The top thread is pre-tensioned before sewing starts to offset the decrease in thread tension when the thread roll is released, ensuring a relatively constant thread tension during feeding and starting the sewing process, preventing thread slippage.
2. Second-stage Dynamic Synchronous Thread Locking: As the needle penetrates thick material and the rotary hook catches the thread, a second, synchronized clamping and thread take-up occurs, dynamically compensating for the significant resistance of thick fabrics. This is combined with automatic thread trimming and a high-stroke presser foot lifting function, resulting in short thread ends and no loose thread residue after trimming.
The pneumatically driven secondary thread clamping device can be synchronized with the optional flip clamp and sliding presser foot, automating the entire process without manual intervention. The mechanically adjustable version supports stepless pressure adjustment via a knob, allowing one-button switching between tension levels for thin, medium-thick, and extra-thick webbing.
III. Four Core Values for Pattern Making Machines
1. Stable Stitches, Significantly Reduced Defect Rate
Equipped with a large rotary hook and thick material sewing structure, the double clamping continuously balances the thread tension. This ensures no loose threads, skipped stitches, or bird's nest-like thread ends when sewing multi-layered leather, thickened webbing, or hanging straps. High-density bar stitching and label sewing result in even and smooth stitches. It supports both thick and thin threads, increasing the finished product qualification rate by over 30% and significantly reducing thread waste and rework.
2. Unleash Automated Capacity and Reduce Manual Intervention
Adapt to USB pattern import and automated cyclic sewing processes. Automatic thread control throughout the entire process-starting, sewing, and thread trimming-eliminates the need for dedicated personnel to adjust the machine or trim threads in real time. High-speed continuous operation at 2800 RPM is trouble-free, increasing equipment uptime by 20% and significantly boosting daily output compared to similar equipment in the same workshop.
3. Easy Installation and Compatibility with Original Factory Structure
Modular external design eliminates the need to modify the main body of the sewing machine or the Dachau electronic control system. Original factory workbenches, pneumatic clamps, and electronic thread adjusters are all compatible. Ceramic thread clamps are wear-resistant and rust-proof, preventing fraying and thread breakage during long-term high-speed operation. Accessory lifespan is doubled, reducing equipment maintenance frequency.
IV. Applicable Industry Scenarios
Luggage and Leather Goods Factories: Barging of multi-layer cowhide and PU leather handbags, reinforcement of handles, and reinforcement of bag buckles;
Webbing and Safety Belt Factories: Lifting slings, backpack shoulder straps, and square pattern sewing of safety belts;
Home and Outdoor Furniture Factories: Thickened fabric and reinforcement stitching for sofa cushions, tents, and outdoor products;
Workwear and Protective Equipment Factories: Thickened webbing for work clothes and protective gear, and fixed-point sewing of Velcro;
Shoe Material and Accessory Factories: Toe reinforcement, fixed-point pattern sewing of thick shoe uppers, and trademark sewing.
V. Original Equipment Manufacturer Advantages
As a leading manufacturer specializing in heavy-duty industrial sewing machines, KINGMAX offers customized secondary thread tensioning components for computerized pattern sewing machines:
- Original factory integrated matching, synchronized electronic control timing, no jamming or action conflicts;
- Supports ODM/OEM pre-installation on complete machines, new machines can be equipped with the secondary thread tensioning device from the factory;
- One-stop workshop and after-sales support, spare parts in stock, on-site installation and debugging guidance;
- Compatible with PDS pattern editing software, batch production programs can synchronously match thread tension parameters, no need to readjust when changing models.