Grades 3–5 · Machines
How does a paper punch remove a neat little circle?
A round paper punch does more than push a dent into a sheet. Inside it, a short cutting part lines up with a matching opening underneath. The paper lies between these two working parts.
In the diagramAn aligned cutter separates a paper diskpapermatching die openingpivotExample lever punch; parts and disk are enlarged.
Pressing the handle turns a lever around a pivot. This arrangement lets a longer movement of the hand produce a strong push over a shorter distance at the cutter. The cutter then enters the matching opening.
Its edge cuts around a circular boundary. The small disk of paper separates from the surrounding sheet and falls into a space below. The missing disk leaves the hole, while the rest of the page stays together.
A spring helps return the working parts when the handle is released. Clean cutting depends on alignment and suitable paper thickness. The tool’s shape controls the outline, which is why a differently shaped cutter can leave a different hole.
About this explanation
Starting knowledge: Know that a lever turns around a pivot and that cutting separates material.
Sources
- Fiskars — Circle Lever Punch (Medium)