1. The pressure is not enough
        There are two situations:
        (1) The mechanical pressure spring is not elastic enough
        At this time, the pressure must be increased. If it is not possible to increase to the maximum position, the spring needs to be replaced. Note: If one of the multiple springs is broken, you need to replace multiple springs at the same time, otherwise there will be uneven pressure, insufficient pressure, etc., resulting in the phenomenon of upper knife and lower knife.
        (2) Insufficient hydraulic pressure
        That is, the hydraulic oil in the oil circuit or the oil pump is not enough, resulting in insufficient pressure. At this time, it is necessary to find out the cause and take the medicine.
        2. The gap between the tool holder and the slider is too large
        When the wear or improper adjustment causes the gap between the knife holder and the slider to be too large (generally 0.1mm), resulting in unstable knife holder, it will cause the phenomenon of upper knife and lower knife. At this time, the gap between the tool holder and the slider needs to be readjusted.
        3. Blunt knife
        When cutting, you must master the cutting amount, change the tool frequently, and use a fast knife. If the knife is too blunt, it will not only affect the quality of paper cutting, but also affect the accuracy and life of the machine, and in serious cases, mechanical accidents may occur.
        4. The angle of the blade is not adjusted correctly
        The angle of the blade should be determined according to the paper being cut. For thin, loose and soft paper, the blade angle should be small, generally 25-30 °; for thick, solid, hard paper, the blade angle should be large, generally 30-35 °. Otherwise, the phenomenon of upper knife and lower knife is likely to occur, and the blade passivation is accelerated.
        5. Blade reason
        Normally, the blade is parallel to the plane of the platform. When the blade is too high or too low, the phenomenon of upper knife and lower knife is also easy to occur. At this time, the blade needs to be adjusted to be parallel to the plane of the platform.
        6. The plane of the feeder (commonly known as the backer) is not perpendicular to the plane of the platform
        The plane of the feeder (commonly known as the backer) is not perpendicular to the plane of the platform, and the phenomenon of upper knife and lower knife occurs. You need to readjust the angle of the two planes with a square ruler to make it 90 °.
        7. The movement direction of the knife holder is not perpendicular to the plane of the paper feeding platform
        If the gap between the knife holder and the slider is just right, you need to adjust the platform plane to be perpendicular to the movement direction of the knife holder. Generally, it is only necessary to adjust the height of the supporting rod supported by the back of the platform and the ground.
        8. Paper reason
        When the paper leaves the factory for a short time and is relatively soft, there is more air trapped in the paper and it is not true, and the phenomenon of upper knife and lower knife is also easy to occur during cutting.
        9. Reason for operation
        There are two situations: ① Do not press the catty during operation, and cut the paper directly after positioning, resulting in the phenomenon of upper knife and lower knife. When cutting, it should be compacted first, and then cut again; ② When the paper stack is pushed forward with insufficient force or excessive force, the paper is bounced back, causing the upper knife and lower knife to appear skewed. When cutting paper, you should regulate the operation.

        Paper cutter is an indispensable product in printing production. Because of its convenience, safety and high efficiency, it has been well received by many users. Like other equipment, it will inevitably fail during use, which will bring certain adverse effects to production. Therefore, it is important to eliminate the fault in time and ensure the normal operation of the machine.
        In the production process, sometimes the knife bed cannot be lowered and the paper cutter cannot cut normally. At the same time, the photoelectric sensor control device also fails. At this time, if all the power is disconnected and then turned on again, the photoelectric sensor control device can work normally and the paper cutter can also be lowered, but the same failure will occur again after a period of work. In this way, it is possible that the electromagnetic switch of the machine has failed. As long as the electromagnetic switch of the same specification is replaced, normal cutting work can be quickly restored.

        The development momentum of the paper cutter industry in recent years can be described as very violent, especially in the current market of survival of the fittest. The competition between various manufacturers has evolved into competition in the market, from the initial equipment room paper cutter, to the electric paper cutter, to the current digital display paper cutter, it can be described as very fierce.
        The development direction of the paper cutter industry depends largely on the printing industry and the packaging industry. This is mainly because the paper cutter is an indispensable device in the packaging industry and the brush industry. According to the existing market, the development of paper cutters is no longer as simple as paper cutting. It needs to integrate various functions, such as high intelligence and high precision, which can effectively improve work efficiency and save resources. Only in this way can the development of the paper cutter industry have more advantages.

        After the paper cutter has been working for a long time, some mechanical wear will occur on the mechanical part. These wears and tears will cause the size of the screen to be inconsistent with the actual cutting size. To solve this problem, we need to enter the "setting mode" to modify the relevant parameters of the machine. So how to enter the setting mode and modify the parameters?
        Turn on the machine first, and then follow the on-screen instructions to complete the initialization of the machine. After the initialization is completed, do not move the paper pusher, and directly measure the distance between the cutter and the paper pusher. Find the "function key" on the machine and click it, then select "setting mode", and then enter the password to successfully enter the "setting mode". At this time, there are three options displayed on the machine. We need to select the "Set Machine Benchmark" option, enter the value of the distance between the previously measured cutter and the paper pusher into the "New Benchmark", and press the "Confirm" option to confirm the input . After that, press the "function key" to exit the "set machine reference" screen. After shutting down and restarting, the modification is completed.

        1. The material of the knife
        The single-piece cutting machine tool is welded by blade and knife body at high temperature, chrome tungsten manganese steel blade has high hardness, low carbon steel knife body. The hardness of the tool steel of the durable blade is proportional to the quality of the blade, and the hardness of the blade is as high as 60 quenching HR55.
        2. The quality of the cutter sharpener
        The higher the quality of the paper cutter, the longer the service life of the cutter.
        3. The shape and angle of sharpening
       Single-sided paper cutters generally use a single sharpening knife with a sharpening angle of 19 ° to 23 °. Sharpening such a shape causes the pressure on the inclined surface tool to be cut during the cutting process, the paper base in one section rubs, and the inclined surface of the blade is quickly worn.
The cutting edge of the double-sided tool has obvious advantages, which helps reduce the load on the machine and improve the accuracy and sharpening of the crop. Therefore, in the case of cutting tool materials, the angle of sharpening should be as small as possible under the premise of considering the size of crop shear resistance.
        4. Different crop materials
        The speed at which the edge of the reamer becomes dull and the wear-resistant material is cut during the cutting process. When cutting paper, the speed at which the blade becomes blunt and the paper texture is soft, hard and how much ash content. The feel of the cutting operation is harder. The greater the ash content in the paper, the faster the blade becomes dull.