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

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.

Our company was formerly known as Changsha Double Star Gear Industrial Co., Ltd, which was established in 1994. It is a directly affiliated university-run enterprise founded by Central South University Professor Zeng Tao, the leading expert on spiral bevel gears in China. It was later renamed as Changsha Senjie Gear Co., Ltd (abbreviated as "CSG") in 2016. CSG is a production R&D base specializing in professional design, reserch, manufacture and sales of high-quality small module spiral bevel gears and high reduction hypoid gears and cylindrical gears. In 2023, Hunan Dinghan New Material Technology Co., Ltd. was established as a specialized international export business department. CSG has strong scientific research and development capabilities and is also equipped a full set of advanced equipment including seven-axis five-linkage CNC spiral bevel gear grinding machines and gear milling machines. By making the best use of the scientific and technological achievements and equipment of the Gear Research Institute of Central South University, machanical processing, heat treatment and testing. We have developed high-quality products featuring high reduction, high speed, heavy load, low noise and less teeth for users.

With the quality policy of "scientific and technological innovation, quality first, being first-class firm and customer‘s satisfaction", we have won the trust of well-known domestic and abroad enterprises with stable and excellent quality. It is committed to be a pioneer of the industry of China's small-module spiral bevel gears, and is dedicated to providing service for any related industry requiring industrial robots, CNC turning and milling compound power tool turrets, industrial sewing machines, reducers, bicycles, power tools and aeromodelling. We sincerely look forward to your cooperation!