No matter the thickness or width of the cut, all of the paper cutters use a wide guillotine-style blade to drive through the stack of paper. The blade is also used for cutting into a nylon cutting stick on the bed of cutter. The stick of cutting makes sure the blade can go through each paper.
However, when it becomes dull because of the long usage, the paper starts to be "pushed" instead of sliced and the cut will be unacceptable. To solve it, you should sharpen it. Unfortunately, it can not be sharpened on the cutter. It must be removed first.
To remove it, before it returns, you should lower it and stop it in the down position. Paper cutter has a setting to do this procedure. You should remove each blade from the outside to the middle: left, right and repeat until the center bolt remains.
After this is completed, you should give back the guillotine to its "up" position and the blade will come off. Several blades are large, so they require two handles that are screwed into corresponding sockets in the face of blade to remove.
The blades of paper cutter are different in model and make. The blade angle is the most significant thing to difference between one blade and another one. It is the cutting edge angle to the blade face. The sharpening must be suitable with the specified blade angle for the model of cutting machine.
If the pitch is too steep, it can affect the performance of cutting and the motor power in driving the mechanism of blade. Thus, it is suggested for you to check the specifications for the appropriate blade angle of cutter.
Actually, it can be sharpened manually. You can sharpen it with a file, grinder or even a stone. However, sharpening it can usually lead to an inaccurate blade angle. The best way to sharpen it is taking it to a professional blade sharpening shop.
Meanwhile, the procedure of blade installation is just the reverse procedure of removal. Just bring the guillotine down, insert the blade, and attach the bolts from the inside to the edges. However, you should first check to ensure that the blade is level. It should also contact the stick of cutting from side to side at the same time. If it can not touch the stick of cutting, it is time for you to replace it for a new blade.