Abstract: This article introduces the technical status and development trend of domestic and foreign thread lockers, and compares the performance and characteristics of several types of thread lockers. Keywords: thread lock machine, status quo, development Thread-locking machine is an important machine for thick paperback and hardcover book binding after printing. Thread binding refers to a method of binding staples together with needles and threads. This method has the advantages of strong binding, long-lasting durability and easy spreading. Lock stitching is mostly used to bind strong and durable books, such as encyclopedias, various reference books, art books and bibles. 1. Technical development of thread locker In 1871, the thread locker was born in Europe. Aster, Martini and Smyth are the world's leading manufacturers of thread lockers. They lead the trend of the development of thread locker technology in terms of design concepts and manufacturing technologies. After more than 100 years of development, the technology of wire lock machine has been greatly developed, especially the high-speed development of computer, electrical control and pneumatic technology in recent years has been continuously applied to wire lock machine, its performance has been greatly improved Improvements, such as automatic adjustment of format size, wrong post detection and other technologies. The newly developed high-speed thread locker has a maximum operating speed of 220 posts / minute. 1. High speed, good stability and high working efficiency In order to meet the urgent need for high speed in the post-press binding industry, various manufacturers have adopted the latest modern design methods and technologies to design and optimize the mechanical mechanism of the thread locker, such as pagination, page turning, and thread lock. The optimization and improvement of the positioning of book signatures, book knocking devices, book clippers, etc., especially the cam curve, improve the stability and reliability of the action of each mechanism. It is no longer very difficult to achieve a maximum speed of 200 ~ 220 posts / min for thread lockers. For example, the 220SA type of Aster Company and the 3214 type of Martini Company can meet the production requirements of this speed. Aster and Smyth's matching lock production line can make the page matching and lock line (up to three lock machines) can be completed in one process, the book block after the lock line can be released by the automatic unloading system and delivered immediately Go to the upper glue machine or manual unloading table. The production line of the interlocking linkage is low in investment and requires only one operating staff, with efficient short-term production. The collating machine is easily separated from the thread locker. The collating machine and the thread locker can handle two different jobs separately. 2. Automated, short adjustment preparation time Automation is an important trend in the development of thread locker technology. With the increasing number of small batches and on-demand printing, the thread locker needs to be set quickly, and the start-up preparation time has become an important measurement indicator. Users require that they can be prepared before start-up without tools. Various settings are made by Computer system programming for automatic adjustment format. Taking the ASTER220SA thread locker as an example, as long as the length, width, number of folds and number of bookbinding staples are entered in the control screen, the computer and the PLC system can locate the stapler positioning device, thread cutter and clip of the thread locker The height of the book knife, conveyor belt and chain, and the output table can be adjusted automatically, and the bottom needle can be set according to the size of the book sticker, thereby reducing the time for adjusting the version to a minimum. Eliminating operational errors is another trend in the development of thread locker technology. The thread locker currently has detection functions such as book jams, missed posts, shrinking posts, and broken lines; the high-end thread locker has image recognition error post detection or barcode recognition error post detection functions to ensure that every One post is correct. The ASTER220SA thread lock machine is equipped with a light control sequence verification system that can check the order of the signatures. The optical sensor in the storage bucket of the spreader can read the 20mm × 110mm printed content on the signatures. If the information read and the stored memory Differently, the machine will display the wrong post information and stop, thus ensuring the correct binding order of the signatures. The detection device of the thread locker monitors the operation status. These devices are placed in the place where the signatures in the thread locker pass. When the thread locker malfunctions or operates erroneously, such as shrinking or missing signatures, the machine will send an alarm signal and shut down. After removing the fault and rejecting defective products, the thread locker can continue to work. 3. Fine needle The thread-locking method is developing towards fine pitch and fine needle. When the bottom needle of the thread locker is punched, the pinhole is larger. When glue is applied on the back process of the hardcover book, it is advisable to penetrate the glue, which is easy to damage the book block, and it is easier to damage the coated paper book block. The diameter is in line with the development trend of the thread locker. At present, the minimum diameter of the bottom needle has reached 1.6mm; the large needle pitch of the thread locker is prone to the problem of large inclination of the back of the book, resulting in book block binding quality and appearance such as book block tightness and flatness. Therefore, some thread locker manufacturers at home and abroad have correspondingly improved the stapler, needle bearing plate and lifting frame and other mechanisms to reduce the needle pitch from the original 23.55-24mm. For example, ASTER's thread locker generally uses 19mm Needle pitch, MATINI company's thread lock machine generally uses 15.8mm needle pitch, domestic Ziguang Machinery Co., Ltd. uses 19mm and 20mm needle pitch. [NextPage] Second, the current status of domestic wire lock machine technology Shanghai Ziguang Machinery Co., Ltd. is a major manufacturer of domestic thread-locking machines. It has the ability to produce and develop a full range of products from automatic thread-locking machines, semi-automatic thread-locking machines and hand-swing thread-locking machines. As early as the early 1970s, domestic thread-locking machines have developed from SXZ-02 to microcomputer-controlled SXZ440 and SXZ440A. The company's newly developed SXZ370 automatic thread locker (maximum binding format 370mm × 300mm, maximum mechanical speed 130 revolutions / minute), the machine adopts a fully enclosed type, safe operation, low noise, electrical control adopts PLC control technology and LCD touch screen display, the page part has a total of 4 nozzles to turn the page up and down, for sets, loose pages, Bookmarks with no long and short edges and uneven thickness can be automatically paged, with detection devices such as book jams, missing posts, shrinking posts, broken lines, and full books at the exit desk. However, due to the high requirements for the manufacturing accuracy and assembly accuracy of the thread locker, the quality stability and reliability of the machine still have a large gap with the advanced foreign models, which has affected the sales of the domestic automatic thread locker. 3. Performance comparison of some thread lockers Sewing machine Product number Format Mechanical speed Number of needle groups Pitch the way Asta 160 type 420X320 160 10 19 Flat, cross 180 type 510X320 180 12 19 Flat, cross 200 type 510X320 200 12 19 Flat, cross Martini Pioneering 370X320 160 10 15.8 Flat, cross Type 3212 385X320 200 10 15.8 Flat, cross Ziguang SXZ370 370X300 130 9 19 Flat, cross SXB430 430X200 85 7 23.55 Flat lock SXB430A 430X200 85 10 20 Flat lock SXB370 370X300 85 9 19 Flat, cross SXB400 400X300 85 10 19 Flat, cross 4. Outlook for future development trends In the future, most of the operation and adjustment functions of the new generation of thread lockers will be set automatically. Obtain information through CTP4 and pass it to the thread locker, and then automatically set various operations and adjustment functions. On the computer display, you can see the operation status of the machine and various related information at a glance. The thread locker will increase and improve various detection and identification functions to ensure that the thread lock products have better binding quality and easier to control costs. In order to meet the needs of the binding industry for automation and high speed, after the lock production line is equipped, the book blocks after the lock line will be automatically transported to the hardcover linkage line or the perfect binding linkage line to form a more complete linkage line.
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