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Mistakes usually occur when people are cutting paper which made of specific texture. Because the utility knife only has one side rely on the ruler, it sometimes runs out of track. In addition, if your hand which holding the ruler too close to the knife, you might cut yourself. The guide ruler has a ditch in the middle of it, letting both side of the knife can be hold by the ruler. Therefore, the utility knife is now unlikely to run out of track. The ruler also has a gap on both ends, allowing user to adjust the direction. Using this guide ruler, we can easily cut a perfect straight line.
CHANG,JIA-YU LIN,LIANG-JUN ZHAN,ZI-LIN HUANG,CHANG-RUEI