Obviously, the inherent technology of sewing machine products is related to the solution of sewing machine's sewing ability, functional requirements, operability, reliability, durability, and product quality, and are related to the technical solutions and methods of the product's own technical development, and the realization of high-speed, automation, specialization and integration. These constitute the specific contents of the core technology of Industrial Sewing Machine products. It can be seen that mastering the core technology of industrial sewing machine must rely on professional knowledge, including other relevant fields. Only by deeply analyzing and truly mastering the core technology of the product, can we develop and design the products with independent intellectual property rights, and gradually establish the product design database and sewing machine mechanism map through continuous technology accumulation, which will lay the foundation for further developing the innovation design of industrial sewing machines.
Of course, the core technology of sewing machine is dynamic and developed. With the maturity of the original product technology, the application of new technology and product upgrading, function expansion and application range change, especially the creation of new thread pattern, etc. The core technology of industrial sewing machine will change accordingly. But many of the common technologies can be used for reference in mastering and analyzing the core technologies of specific products. Especially when developing design series products, this is especially true. This shows the importance of technology accumulation and experience.
As an example, try to list the core technologies that high speed flat sewing machine should understand or master.
（1） Lightweight technology
1. analysis and test technology of main vibration source of casing
2. light materials and their surface coating technology
3. influence of the shape of the cross section of the shell on the vibration
（2） The factors influencing the realization of low tension sewing
（3） Measurement technology of dynamic tension of surface line
（4） Design technology of spindles
The industrial sewing machine industry has established the thread pattern standard, and the basic mechanism types of various sewing machines are mature after long-term use, and the mechanism types tend to be fixed. The improvement of product quality, variety development, technical level and update are more reflected in the continuous improvement of the original products. The application of mechatronics technology provides more space for the gradual and continuous change and innovation of products, but it must also increase the functions of automation, integration or systematization based on the original products. It is not possible to change the basic mechanism type of industrial sewing machine completely. Even if the cam mechanism is replaced by electronic control technology like the periodic sewing machine, it is only the change of control mode to simplify the mechanism, and does not fundamentally change the basic functional structure types of the nailing machine, keyhole machine and binding machine. According to the characteristics of industrial sewing machine, reverse design is an effective method which is suitable for the current development level of sewing machine in China.
Reverse design is also an innovative design. It must comprehensively, deeply and systematically analyze the existing advanced products with various scientific test methods, understand and master the structure characteristics, mechanism principle, function, quality level and relevant design parameters of the product, and at the same time, it must also apply new technology, new technology and technology to the products The new materials are evaluated on the basis of digestion and absorption. The paper makes judgment on the problems of the products found in the analysis, the requirements and potential requirements of product quality from users and market feedback, and develops the innovative products as the breakthrough point of innovation design. Therefore, reverse design is a kind of innovative design method with pioneering, practical and comprehensive characteristics.
（1） Market demand
Any sewing machine product development comes from the market demand. The guiding ideology is to make the greatest contribution to the development strategy of the enterprise and the highest success rate of development. Recognize the market, economy and high quality of the products and make choices to meet the needs of different levels of market.
（2） Sample selection
The selection of base products as prototype is beneficial to the development of series products in the future; Pay attention to the advanced nature of the prototype. Choose famous brand products; Pay attention to the user's requirements for product quality and potential quality; We should attach importance to the establishment of product data (sample) database.
（3） Prototype evaluation items (different industrial sewing machines, different evaluation items)
Seam evaluation: broken thread, broken needle, skipping needle, floating line, skew thread trace, neat line trace arrangement, suture tension, uniform high and low speed thread trace, latent movement of sewing material, wrinkle, vibration, noise, torque, etc
Function evaluation: functional parameters and reliability
Durability evaluation: durability of key parts
Evaluation of regulation performance: adjustable, stable, adjustable range and operability
Safety evaluation: Operation Safety
Rationality evaluation of sewing process design parameters: motion cycle diagram, function mechanism actuator movement diagram, etc
Assembly evaluation: positioning benchmark, assembly clearance, etc
New materials, new processes and new technology evaluation: Characteristics Analysis
Appearance design evaluation and other (including structure and size of parts)
Product difference evaluation: analysis of characteristics
（4） Evaluation method
Compare with the existing products or other advanced products collected, and the internal control standards of foreign advanced enterprises. The conclusion is used as the technical index and evaluation basis of innovative product design.
（5） Examples of innovation schemes
1. innovative design of feeding mode: feeding materials down, needle feeding, feeding up and down, differential feeding, feeding up and down with variable feeding quantity, new structure of independent movement of up and down feeding, comprehensive feeding, roller feeding, etc;
2. innovative design of the line picking mechanism: cam thread picking, connecting rod pick-up, sliding rod pick-up, rotating disc pick-up, etc;
3. innovative design of needle mechanism: Central crank slider mechanism, rocker slider mechanism, connecting rod mechanism, needle rod swing from pivot to translation mode, etc; 4. the design of upper and lower shaft transmission modes: connecting rod, gear, synchronous belt, etc., and the innovation of feeding mechanism.
（6） Innovation Program
After sample evaluation, confirm the improvement project, clarify the objectives and technical requirements to be met, complete the specific design scheme by using product data (sample) database, design database, organization map and relevant professional knowledge and experience, and verify the actual products of the improved part. Sometimes, it needs to be repeatedly modified to complete the optimal scheme.
The above is a brief introduction to the reverse design process.
Of course, innovative design has the improvement and the fundamental. As long as we set up the innovative design concept, study hard, dare to explore and constantly summarize the experience, our innovation level and innovation ability will be improved. This will promote the breakthrough progress of sewing machine industry in China and accelerate the pace of China becoming the largest sewing machine production power in the world
