20CrMnTi High-Precision Sewing Machine Gears High Surface Hardness For Sewing Machine

Compound feed lockstitch sewing machine gears are core precision transmission gears specially designed for tri-synchronous compound feed lockstitch machines. Made of high-strength wear-resistant alloy through small-module precision machining, high-precision heat treatment and gear grinding, they are mainly used for power distribution and synchronous motion of main shaft drive, upper & lower compound feeding, tooth holder swinging, thread take-up and thread trimming mechanisms. Featuring accurate transmission, good synchronism, impact resistance, low noise and long service life, they are widely used in heavy-duty sewing such as thick materials, sofas, leather, luggage and automotive interiors, serving as key parts to ensure uniform stitches and stable feeding.

Product Features

• Small module, high precision and strong transmission synchronism to ensure consistent upper and lower feeding.
• Impact and fatigue resistant, suitable for heavy-duty sewing of thick materials, multi-layer materials and leather.
• High tooth surface hardness and good wear resistance, not easy to wear during long-term high-speed operation.
• Smooth operation, low vibration and low noise, improving continuous working stability.
• Small heat treatment distortion, high dimensional consistency and strong assembly interchangeability.
• Compact structure, suitable for narrow space of compound feed sewing machine heads.
• Accurate linkage with thread trimming, backstitch and presser bar lifting mechanisms with synchronized actions.

Technical Parameter Table

Main Applications

• Main drive gears for tri-synchronous compound feed lockstitch machines and heavy-duty machines.
• Gear sets for upper & lower compound feeding mechanism and tooth holder swinging.
• Transmission gears for computerized automatic thread trimming, backstitch and bartacking.
• Sewing equipment for leather, sofas, mattresses, luggage and automotive seats.
• Industrial sewing machines for canvas, Oxford cloth, seat belts and other thick materials.
• Gear replacement and maintenance for domestic & imported compound feed machines.

Product Advantages

• High synchronous transmission precision, consistent upper and lower feeding, no deviation, no skipped stitches.
• Heavy-duty and impact resistant, suitable for continuous sewing of multi-layer thick materials and leather.
• Stable at high speed up to 5500rpm with uniform and beautiful stitches.
• Long wear life, greatly reducing downtime and maintenance frequency.
• Low noise and low vibration, improving workshop working environment.
• Strong interchangeability, matching mainstream models such as Brother, Jack, Zoje, Phoenix.
• Support customization based on drawings for special heavy-duty sewing equipment modification.

Production Process

• Raw Material Inspection → 2. Precision Cold Forging / Cutting → 3. Normalizing Treatment
• CNC Fine Turning → 5. Hobbing / Milling → 6. Carburizing & Quenching
• Low-Temperature Tempering → 8. Bore & End Face Grinding → 9. Gear Grinding / Shaving
• Deburring, Cleaning & Sandblasting → 11. Accuracy, Hardness & Meshing Inspection
• Anti-Rust Treatment & Vacuum Packaging

Cautions

• Overload sewing of extra-thick and extra-hard materials is strictly prohibited to avoid gear chipping and fracture.
• Dry running without oil is forbidden to prevent rapid wear, ablation and increased noise.
• Striking the tooth surface during installation is not allowed to avoid tooth deformation and synchronization failure.
• Prevent thread lint, cloth scraps and dust from entering the gearbox to avoid abrasive wear.
• Control operating temperature within -10℃~70℃ to avoid lubrication failure caused by high temperature.
• Stop immediately for maintenance if abnormal noise, jitter or stitch deviation occurs.
• Gears must be replaced in pairs when wear exceeds standard to ensure synchronization accuracy.
• Keep storage environment dry and ventilated to avoid corrosion affecting transmission precision.

Why Choose us?

• 7-axis CNC Grinding: Tolerances as tight as ±5μm for quiet, durable operation.
• Strong technical expertise: Doctoral and master’s professionals in spiral bevel gear technology.
• Custom Design: Solutions for high-reduction, high-speed, heavy-load, and low-noise and less teeth for users
• Rigorous Testing: 100% inspection via Gleason metrology systems.