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Overview of my country's Special Sewing Machine Technology Status

Overview of my country's Special Sewing Machine Technology Status

domesticSpecial sewing machineWith mechanical structure as the main body, there are a small number of electronic special machines. Compared with flat and overlock sewing machines, its technological development is far behind the advanced level of foreign countries. Take several models as examples to discuss the current technical status of my country's special sewing machines. Because the sewing mechanism of special machines is similar, the mechanism principle and manufacturing technology are mainly described here.

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One is the flat head lock machine. This kind of domestic special sewing machine is basically mechanical, most of which are models inherited from Japanese heavy machinery, and a small number of models inherited from Japanese brothers. Its main technical features are as follows: the needle bar change mechanism is driven by a triangular cam or eccentric wheel, and a light metal needle bar swing frame; the variable speed feeding control basically uses a cam roller mechanism; the timing control device uses a cam plus a bump; Mechanical cutting device; lifting the presser foot linkage trimming. In practical applications, this type of flat-head lock special sewing machine is extremely prone to many mechanism design problems. For example, cutting knives and scissors are easy to wear and the needle bar is worn due to improper selection of aluminum alloy materials or proper surface oxidation treatment, which affects the sewing performance.

The second is the tacking special sewing machine, which is basically mechanical, most of which are inherited from Japanese heavy machinery and Japanese brothers. The main technical characteristics are as follows: shuttle hook thread; X, Y two-direction variable speed feeding is adopted Cam roller mechanism; timing control device adopts cam combination structure; adopts double friction wheels for high and low speed control; cam controls thread trimming. The problem that this kind of special sewing machine is prone to is the failure of high and low speed control and the instability of thread trimming. There are both original design problems and manufacturing problems. This is also the goal of tacking special sewing machine repair technology to become the first choice for mechanics to learn and repair. One reason.

The third is a special sewing machine with round head buttonhole. The development of this kind of sewing machine in China is very backward, and many manufacturers canceled after setting up the project. Although there are also manufacturers, they are mainly imitating German models. The main driving mechanism adopts the cam structure; the timing control also adopts mechanical structures such as cam lugs and cam plates. Therefore, its prone problems mainly include cam drive mechanism clearance, wear, noise, vibration and poor sewing caused by poor trajectory, and timing failure caused by poor control mechanism parts. At present, the lack of cam theory design and the lack of analysis and design of timing control mechanism are the main obstacles to the development of special round-head buttonhole sewing machines in my country.

To sum up, the current main problems of domestic mechanical special sewing machines include cam design and precision machining technology, gear parts precision machining technology, scissors parts manufacturing, cycle timing control design and manufacturing, etc. In addition, domestic small and medium-sized suppliers have always been the main parts of domestic special machine parts, and the unstable quality of parts is also an important factor in the stagnation of domestic special machine development. At the same time, it should be noted that the domestic mechanical special sewing machine has entered a period of rapid development, and some complete machine manufacturers have begun to improve and improve from both design and manufacturing. As most of the domestic main parts suppliers enter the special machine parts supporting system, it can be expected that a variety of domestic special sewing machines will enter the mainstream of the domestic machinery special machine market within 2 to 3 years.

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