Automatic Thread Trimming 20CrMnTi Sewing Machine Gear Set for Apparel

Product Specification

Automatic Thread Trimming 20CrMnTi Sewing Machine Gear Set for Apparel Production

Automatic thread trimming lockstitch machine gears are precision core transmission parts for high-speed single/double-needle automatic thread trimming lockstitch machines, including spur gears, helical gears, lower shaft thread trimming gears, bevel gears, duplex gears and gear shafts. They are compatible with computer direct-drive, high-speed servo, automatic presser foot lift/reverse stitch/thread trimming integrated models. Made of 40Cr/20CrMnTi high-quality alloy steel with quenching & tempering + induction hardening, they feature high speed & low noise, wear & impact resistance, fast trimming response and precise transmission. They transmit power for the main shaft, feeding, tooth lifting, reverse stitching and lower shaft thread trimming mechanism, ensuring synchronized sewing and trimming, neat stitches and stable thread end residue (≤3.5mm). They are key vulnerable parts of automatic lockstitch machines.

Product Features

• High-speed & quiet tooth profile: Small module, 20° pressure angle and polished tooth surface ensure smooth meshing with noise ≤65dB, suitable for 3000–5000 rpm high-speed operation.
• Reinforced for thread trimming: Thickened tooth root on trimming gears resists impact, preventing chipping/skipping during frequent trimming with fast response and stable residue.
• High wear resistance & long life: Tooth surface hardness HRC 50–58 provides wear & fatigue resistance, enabling ≥8000 hours of continuous maintenance-free operation.
• Precise synchronous transmission: ISO Grade 7 precision with uniform meshing clearance ensures synchronized feeding/trimming/lifting and stitch length error ≤±0.1mm.
• Low heat & high efficiency: Smooth tooth surface reduces friction, limiting temperature rise ≤35℃ at high speed, lowering motor load and saving energy.
• Oil & corrosion resistance: Blackened/phosphated surface resists sewing oil, dust and rust, adapting to closed oil pan lubrication.
• Strong interchangeability & easy maintenance: Standard module and inner hole fit Juki, Brother, Zoje, Hikari and other mainstream brands for easy replacement.
• Universal for thin/medium-thick materials: Moderate tooth width and torque adaptability ensure smooth thin-material and stable medium-thick material sewing.

Technical Parameter Table

Main Applications

• Main shaft transmission gears and gear shafts for computer direct-drive automatic thread trimming lockstitch machines.
• High-speed gear sets for feeding and tooth lifting mechanisms.
• Gear parts for reverse stitching and stitch length adjustment mechanisms.
• Special lower shaft thread trimming gears (dual-knife trimming drive).
• 90° direction-changing bevel gears (main shaft → lower shaft power transmission).
• Automatic sewing equipment for thin/medium-thick materials in apparel, home textiles, underwear and shirts.
• Transmission components for high-speed lockstitch machines in luggage, leather goods and hat industries.
• Replacement gears for old automatic lockstitch machines (Juki, Brother, Zoje, etc.).

Product Advantages

• High speed & low noise: Precision tooth profile + polishing ensure quiet operation (≤65dB) at high speed, improving workshop environment.
• Reliable trimming: Special trimming gear design prevents chipping during frequent trimming with stable residue ≤3.5mm.
• Wear resistance & durability: Alloy steel + induction hardening deliver 2–3x longer life than ordinary gears, reducing downtime.
• Precise transmission: ISO Grade 7 precision ensures synchronized feeding/trimming, uniform stitch length and neat stitches.
• Energy efficiency: Low-friction design reduces motor load by 10–15%, saving power.
• Wide compatibility: Fits all major brands of automatic thread trimming lockstitch machines, universal for thin/medium-thick materials.
• Easy maintenance: Standard specifications and strong interchangeability enable quick installation and replacement.
• Cost-effective: Mass production with stable quality reduces equipment operation and maintenance costs.

Why Choose us?

• 7-axis CNC Grinding: We adopt high-precision 7-axis CNC grinding machines, holding tolerances as tight as ±5μm, ensuring gears run quietly, smoothly and with outstanding durability.
• Strong technical expertise: Our core R&D team includes doctoral and master’s professionals specializing in spiral bevel gear technology, providing strong technical support for complex projects.
• Rigorous testing & high precision: All gears undergo 100% inspection with Gleason metrology systems. We can achieve DIN 6 grade accuracy with strict control over tooth profile and direction errors, keeping our quality at the industry-leading level.
• High transmission efficiency: Our gear designs support a single-stage reduction ratio of up to 300:1, with actual transmission efficiency reaching over 95%, greatly improving energy utilization.
• Excellent durability & cost efficiency: Our gears deliver 40% lower lifecycle cost and a failure rate below 0.5%, ensuring stable long-term operation and reduced maintenance costs.
• Fast response & short lead time: Supported by our digitalized production process, we are able to shorten the delivery cycle to only 20 working days, helping you accelerate project development and launch.
• Professional custom design capability: We provide fully customized gear solutions for applications requiring high-reduction, high-speed, heavy-load, low-noise, and special small-tooth profiles, based on your actual working conditions.