Paper cutter is a kind of paper processing equipment. It has a wide range of applications in a series of paper and non-paper processing fields. It is a universal device. At the same time, paper cutters also occupy an important position in printing machinery products. Paper cutters are green paper processing equipment and indispensable production equipment for green printing enterprises. At present, the paper cutters on the domestic market mainly include automatic paper cutters, CNC paper cutters, automatic CNC paper cutters, electric paper cutters, and program-controlled paper cutters. Its main cutting system, positioning system, and paper pressing system are all close to the international advanced level, and the control system is gradually perfecting. Regardless of its appearance design, function, and operation performance, great progress has been made.
Despite the rapid development of China's paper cutter manufacturing industry in recent years, there are still gaps compared with some international brands, mainly in terms of automation control and cutting accuracy. Paper cutter operators generally report that foreign famous brand paper cutters are more accurate than domestic ones. In addition, investment and procurement, domestic hydraulic paper cutters are prone to inconsistent cutting dimensions and "mushroom edge" phenomena when opening materials. Therefore, many strong printing companies prefer to buy imported paper cutters at high prices, which also restricts the development of domestic paper cutters.
On the other hand, the paper cutters used by many domestic printers are still mechanical paper cutters equipped in the 1980s and 1990s. This paper cutter obviously has some problems: there is no high-precision size positioning system and size setting device for printers to visit, the accuracy is low, and it cannot meet the requirements for cutting high-end printed products; mechanical paper cutters have high impact, high noise, The safety mechanism is unreliable and easy to cause work accidents; the level of automation is low, there is no automatic paper feeding mechanism, the labor intensity is high, the security printing is low, and the production efficiency is low. In addition, due to the differences in regional economic development, the types of paper cutters used by printing companies in different regions are also different. For example, mechanical paper cutters in the central and western regions and small and medium-sized private printing companies are still widely used; large printing companies and printing companies in the southeast coastal areas mostly use hydraulic digital display and hydraulic program-controlled paper cutters; Sino-foreign joint venture printing companies and Banknote printing companies basically use imported paper cutters.
It can be seen that there are still many problems in the development of domestic paper cutters, but it is precisely such problems that herald a bright future for domestic paper cutters.
      (1) Large room for growth There is a considerable gap between the level of print consumption in China and the world ’s developed countries and the world average. There is a lot of room for the development of new technologies and industries in the printing industry, which will definitely promote the continuous development and innovation of paper cutter technology. .
      (2) Wide scope of application With the diversified development of modern printing and the expansion of the printing field, the cutting requirements from cutting, single-sided cutting, special processing and cutting layout design, as well as the cutting requirements of printed products such as glazing and lamination, etc. More and more diverse. These will inevitably make the paper cutter more perfect to complete more and more complex cutting processes.

1. Structure and working principle of paper cutter
It has a wide range of uses, large cutting specifications, strong flexibility and high production efficiency. The single-sided paper cutting machine is composed of a working platform, a paper pusher, a paper press, a cutting blade and a knife pad. The function of the work platform is to feed and discharge paper. The surface of the work platform is provided with steel balls and air holes arranged at a certain distance, which can form an air cushion between the paper stack and the platform, reduce the frictional resistance with the platform, and make the paper input and output light and free. The left and right wall plates of the paper cutter, the pusher and the platform should be at an angle of 90 ° to ensure accurate and consistent paper cutting. Whether the paper press can evenly press the paper stack also determines the accuracy of the paper cutting. Generally, the larger the pressure of the paper press, the better, which can prevent the deformation of the paper from affecting the cutting accuracy. The paper press has a screw structure, a spring structure and a hydraulic structure. The pressure of the hydraulic structure of the paper press is uniform and sufficient, and the adjustment and control are simple, and it is now commonly used. Its working principle is: the oil pump presses the oil in the oil tank into the oil cylinder to lift the piston, and pushes the push lever to push down the pressure of the paper press.
Second, the relationship between the blade edge angle and cutting accuracy
The smaller the blade edge angle, the sharper the blade, the higher the cutting accuracy, the lighter the work load of the blade holder, the less wear of the machine, and the lower the power consumption. However, the blade angle is too small, which is easy to wear and damage, especially when cutting hard and thick paper. Therefore, the most suitable blade angle is 22, and for harder materials, a double bevel blade with 24 ° / 22 ° is used to ensure cutting accuracy.
Third, the relationship between knife pads and cutting quality
The shim strip protects the blade and cuts off the "backing paper". Practice has found that after the newly installed blades and shim pads, the quality of the paper cut by the first knife is not necessarily good, and the edge of the backing paper may not be smooth, or even cut continuously. This shows that not only the flatness of the shim is required, but also a moderate scoring depth of no more than 0.5mm. The edge of the cut paper is straight and neat. Because the blade and the shim strip cannot be absolutely straight, in order to ensure a uniform cutting of the backing paper, a sliver of paper is often properly placed on the back of the shim to achieve the desired "cut" effect.
Fourth, the issues that should be paid attention to when using the paper cutter
1. Normally, good lubrication and maintenance should be performed on important parts of the machine such as the guide rail, the screw and the linkage paper presser, and maintenance should be performed in a timely manner to ensure the cutting accuracy of the machine;
2. Correct the machine to ensure that the paper is cut at a right angle. The pusher must not only be 90 ° to the platform, but also keep parallel to the cutter. The paper press should adjust the working pressure according to the soft and hard conditions of the cut paper to prevent the paper from cracking and displacement and ensure the cutting quality;
3. Use the blade correctly to improve the cutting accuracy of the product. After rough grinding with a blunt blade by an electric sharpener, "whetstone" and fine-grained abrasive cloth should also be used for fine grinding to eliminate edge burrs. When cutting, it is better to cut dozens of knives with soft paper such as waste paperboard and offset paper, run in the blade edge, eliminate the burr on the edge of the blade, and prevent the problem of chipping of the hard paper directly. In summary, correctly understanding and mastering the technical principles of paper cutting, and using the paper cutter scientifically and rationally, can not only reduce or avoid various failures, increase the service life of the machine, but also improve production efficiency and product quality.

        General principles of hydraulic system fault diagnosis for paper cutter manufacturers
        Correct analysis of failures is the prerequisite for troubleshooting. Most system failures do not occur suddenly. There are always warning signs before they occur. When the warning signs develop to a certain degree, a fault occurs. The causes of failure are various and there are no fixed rules to find. Statistics show that about 90% of the failures in hydraulic systems are caused by poor management. In order to diagnose faults quickly, accurately, and conveniently, it is necessary to fully understand the characteristics and rules of hydraulic faults, which is the basis of fault diagnosis.
        The following principles are worth following in troubleshooting:
      (1) First, determine whether the working conditions and peripheral environment of the hydraulic system are normal. First, it is necessary to find out whether the mechanical part of the equipment or the electrical control part is faulty, or whether the hydraulic system itself is faulty. Claim.
       (2) Area judgment Determine the area related to the failure based on the failure phenomenon and characteristics, gradually narrow down the scope of the failure, detect the components in this area, analyze the cause of the failure, and finally find out the specific location of the failure.
      (3) Grasp the types of failures for comprehensive analysis According to the final phenomenon of the failure, gradually find out a variety of direct or indirect possible causes. In order to avoid blindness, comprehensive analysis and logical judgment must be performed according to the basic principles of the system to reduce the number of suspects Gradually approach, and finally find the fault.
      (4) When verifying the possible cause of failure, generally start from the most likely cause of the failure or the easiest place to test, which can reduce the workload of assembly and disassembly and improve the speed of diagnosis.
      (5) Fault diagnosis is based on operating records and certain system parameters. Establish a system operation record, which is the scientific basis for preventing, discovering, and handling faults. Establish a device operation fault analysis table, which is a high-level summary of experience and helps to quickly judge the fault phenomenon. Make accurate quantitative analysis of failures.
        2.Troubleshooting methods for paper cutter manufacturers
        The traditional method of finding hydraulic system failures on a daily basis is to gradually approach the fault by logical analysis.
        The basic idea is comprehensive analysis and condition judgment. That is, the maintenance personnel judge the cause of the failure based on experience through observation, listening, touch and simple tests and understanding of the hydraulic system. When the hydraulic system fails, there are many possible causes for the failure. The logical algebra method is used to list the possible failure causes, and then make logical judgments one by one based on the principle of easy-to-fail, and then approach each item one by one, and finally find out the cause of the failure and the specific conditions that caused it.
        In the process of fault diagnosis, maintenance personnel are required to have basic knowledge of hydraulic system and strong analysis ability to ensure the efficiency and accuracy of diagnosis. However, the diagnosis process is cumbersome and requires a large number of inspections and verifications, and it can only be analyzed qualitatively. The cause of the diagnosis is not accurate enough. In order to reduce the blindness and experience of system fault detection and the workload of disassembly, the traditional fault diagnosis methods are far from meeting the requirements of modern hydraulic systems. With the development of hydraulic systems toward large-scale, continuous production, and automatic control, a variety of modern fault diagnosis methods have emerged. Such as the iron spectrum technique, the number, shape, size, composition and distribution of various abrasive particles that can be separated from the oil can be used to timely and accurately determine the wear position, form, and degree of components in the system. In addition, quantitative pollution analysis and evaluation of hydraulic oil can be performed to achieve online detection and fault prevention.
        Expert diagnosis based on artificial intelligence, which uses computer to imitate the methods used by experienced experts in a certain field to solve problems. The failure phenomenon is input into the computer through the man-machine interface. The computer can infer the cause of the failure based on the input phenomenon and the knowledge in the knowledge base, and then output the cause through the man-machine interface, and propose a maintenance plan or preventive measures. These methods bring broad prospects to hydraulic system fault diagnosis and lay the foundation for hydraulic system fault diagnosis automation. However, most of these methods require expensive detection equipment and complex sensor control systems and computer processing systems. Some methods are difficult to study and are generally not suitable for field promotion.

I. Features of Sheetfed Paper Cutting Machine:
1) The cutting format is generally between 920mm-2200mm;
2) Comprehensive control involving machinery, electrical appliances and hydraulic pressure;
3) A large number of cuts can be cut;
4) High precision of cutting;
5) Prices range from tens of thousands to hundreds of thousands of printing tools depending on the size and configuration of the cutting format.
Cutting process of sheet-fed paper cutter:
1) Determine the position of the pusher according to the size of the cut paper;
2) Position the paper that has been flushed against the front surface of the pusher and the side fence to position the paper;
3) The paper presser first lowers and compresses the paper, and then the cutter cuts down to cut the paper;
4) After cutting, the cutter leaves the paper stack and returns, and then the paper presser rises to reset the printing market.

        Paper cutting machine is a device for processing paper, which is generally used for the processing of paper types in paper mills and the refurbishment of prints in the printing industry. In addition, the paper cutter can also be applied to non-paper cutting. Paper cutters have a wide range of applications, ranging from printing and publishing industries to small photo studios and printing centers. From this we can see that paper cutters have a very large market share.
        So what should you pay attention to when buying a paper cutter? Ruian Maoyuan Machinery introduces you:
        First of all, to understand what types of paper cutters are currently on the market, they can be divided into two types according to the operation method, one is manual type, and the other is fully automatic type controlled by computer. Generally speaking, single-sided knives for manual paper cutters have a size of 52-150cm. In larger enterprises, choosing a computer-controlled paper cutter can better cooperate with digital printing because it can store data. When the processed items are processed again, they only need to call up the original program.
        In order to improve the service life of the cutter, the thickness of the cutting should not exceed the maximum cutting thickness. The adjustment of the pressure of the cutter should be determined according to the quality of the paper. The pressure of the harder paper should be less, otherwise Need more pressure. The electric paper cutter must keep the wind of the passerby, maintain and use the blade correctly, and once it is blunt, the blade should be reground, otherwise it will affect the cutting accuracy. In addition, be aware that the ambient temperature is between 19 and 23 degrees Celsius, not in humid environments. Under these conditions, the characteristics of the paper are relatively stable, which is good for cutting. This is because the determination of the cutting parameters is based on the characteristics of the paper, so under the external environment to ensure the stability of the paper cutter, it is also necessary to ensure the cut paper.