1. The pressure is not enough
There are two situations:
(1) The spring force of the mechanical pressure spring is not 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), and the knife holder is unstable, it will cause the upper knife and the 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 angle of the blade should be small, generally 25-30 °; for thick, solid, hard paper, the angle of the blade 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.

        If the cutter does not drop the knife, one of the reasons is that the internal components are rusted. To reduce the rusting of the internal components of the cutter, we need to do the following:
        1. Judging from the sound. If the sound of the cutter is abnormal and there is a sound that the latch cannot lock the cutter bed when the machine is shut down, you should check the functions of the cutter and other components.
        2. Protect from lubrication. To maintain a reasonable maintenance cycle and keep the cutter operating well, it is necessary to pay attention to the connection between each operating element and the oil filling point on the right side of the rear end of the fuselage. Lubricate this filling point and lithium base grease. Normal maintenance.
        3. Cultivate from the habit. One is to control the workload and the number of cuts per knife. It is necessary to avoid overloading and overloading of the cutter as much as possible; second, consider the lithographer from the machine itself, do not leave the machine in a long-term stagnation state Even if it is not working, it should be operated periodically for several strokes to prevent the related parts from corrosion.
        In addition to the points mentioned above, at the same time, we also need to develop good switch machine habits, regularly check the status of safety components, and regularly do lubrication and maintenance work, so as to better protect the paper cutter.

        1. The position and location of the hydraulic paper cutter are different according to different models. Therefore, please pay attention to safety during the transportation process and need to balance it in a clean environment.
        2. For the use of the power supply, connect the device according to the rated voltage in the manual. If the voltage is too high or too low, it will cause the device to operate abnormally. Therefore, it is recommended to use an AC stabilized power supply when using the hydraulic paper cutter. Improve work quality and efficiency. In addition, use this large equipment to ensure that it has a good grounding socket.
        3. There is also a very important note for the use of power supplies, that is, do not overload the voltage. In order to avoid dangerous accidents such as fire or electricity leakage.
        4. When cleaning the hydraulic paper cutter, set the power off and pull out the power plug.
        5. When using the equipment, do not allow liquid to flow into the interior of the paper cutter to avoid scrapping the paper cutter.
        6. When using a hydraulic paper cutter, children or non-related personnel are prohibited from operating. In addition, under the blade and the knife edge must not be lifted during operation. At the same time, the cutter blade should not be used to cut hard or fragmentable materials.
        7. Under normal use, maintenance of equipment transmission parts should be carried out once a month, which is to increase lubricating oil properly to prolong the service life of equipment.

        Flat sheet cutting is a method of cutting by a paper cutter, and its application range is very wide, so many industries will choose this method to cut paper. In order to let everyone understand the method of flat sheet cutting more clearly, the following editor will give you a detailed introduction to the detailed process of the cutting method, so that you can better master this cutting method .
        1) Position the paper pusher according to the size of the paper being cut.
        2) Make the paper that has been collided close to the front surface of the paper pusher of the cutter and the side fence to position the paper.
        3) The paper presser first lowers and presses the paper, then the cutter then falls and cuts the paper.
        4) After cutting by the paper cutter, the cutter will leave the paper stack and return, and then the paper presser will rise and reset.
        In general, there are several cutting methods of the paper cutter, but most of the cutting methods are relatively the same, so whichever cutting method you choose can have a good cutting effect. However, there are some differences in the use of equipment of different specifications and models, so when you buy the equipment, you must understand the information about the use of the equipment and the effect of the equipment in order to help you choose a more suitable equipment.

        Many digital printing practitioners tend to overlook the use of paper cutters, and the safety of paper cutters is critical. There are several aspects that affect the safe use of the paper cutter:
        1. Brake device. In order to save money, many manufacturers use the principle of circuit braking, that is, cutting off the power supply of the cutter motor through the upper and lower limit sensors. This device may cause "slider" in the event of sudden power failure, loose sockets, and sensor failure. Extremely dangerous situation. In order to prevent this from happening, it is necessary to use a motor assembly with a mechanical brake device, so that no matter what circuit failure occurs, the motor is locked to avoid accidents.
        2. Operation principle of double button. This requires that both buttons are pressed at the same time, otherwise the cutter motor will not move, which can ensure the safety of single-person operation.
        3. In the actual use process, two people often cooperate to operate, so that the situation becomes very dangerous, which requires the cutter to be equipped with front and rear safety covers. When the safety cover is opened, the motor will not move to ensure safety.
        4. The above is a safety factor that affects the use process, so pay attention to the replacement of the blade during maintenance and maintenance, use the knife holder to ensure that the blade edge is closed, not only to ensure the safety of people, but also to ensure that the blade is not damaged.
       5. Furthermore, the removed blades must not be left at will to avoid hurting people.
        Therefore, we must first buy equipment with a high safety factor. Furthermore, we must develop good habits to ensure safety at work.