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How does a stapler work?

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Quick answer

A stapler works by forcing a U-shaped metal staple through paper using a spring-loaded driver blade. When the staple's legs hit the grooved anvil underneath, they bend inward and upward, clinching the sheets together. The bent legs act like a clamp, holding the paper firmly without needing a separate hole.

A stapler drives a metal staple through paper and folds its legs flat against a metal anvil. This clinching action binds the sheets together without punching a hole through them.

Step by step

  1. A staple is loaded into the magazine, where a spring pushes it forward under the driver blade.
  2. Pressing the handle pushes the driver blade down onto the staple's crown.
  3. The driver forces the staple's sharp legs through the stack of paper.
  4. The legs hit the anvil's curved grooves and bend inward and upward.
  5. The bent legs curl back into the paper, clinching the sheets together.

Key things to understand

  1. A staple is a U-shaped piece of stiff wire with two sharp legs joined by a flat crown.
  2. Pressing the top handle pushes a driver blade down onto the staple's crown.
  3. The driver forces the staple's legs through the paper stack and into the anvil below.
  4. The anvil has curved grooves that bend each leg inward and upward as it hits.
  5. The bent legs curl back into the paper, locking the staple and clamping the sheets.

Labelled diagram

  1. Handle pressed

    The handle pivots down, pushing the driver blade toward the staple.

  2. Driver pushes staple

    The blade forces the staple's crown downward, driving legs into paper.

  3. Legs hit anvil

    The sharp legs strike the anvil's curved grooves and begin to bend.

  4. Legs bend inward

    Grooves guide each leg to curl inward and upward, forming a clinch.

  5. Paper clamped

    The bent legs lock the staple, holding the paper sheets together.

How a stapler clinches a staple

Real-world examples

  • In an office, a desktop stapler binds a 10-page report by driving one staple through the corner.
  • A heavy-duty stapler uses thicker wire to bind a 100-page booklet, requiring more force.
  • An electric stapler uses a motor to drive the blade, allowing fast repeated stapling.
  • A surgical stapler closes wounds by driving staples into skin, later removed with a special tool.

Common mistake

✗ Myth: A stapler punches a hole through the paper.

✓ Fact: A stapler does not remove any paper; it pushes a metal staple through the sheets. The staple's legs are then bent to hold the paper, leaving no hole behind.

People also ask

What is inside a stapler?
Inside a stapler you find a magazine that holds a strip of staples, a spring that pushes them forward, a driver blade attached to the handle, and an anvil with curved grooves. The handle acts as a lever to multiply force, and the anvil bends the staple legs to clinch them.
How does a staple bend?
A staple bends because its legs hit the anvil's curved grooves at an angle. The grooves redirect the force, causing each leg to curl inward and upward. This bending is plastic deformation, meaning the metal stays bent after the force is removed.
Why do staples have two legs?
Two legs let the staple grip the paper from both sides. When driven, the legs pass through the sheets and then bend outward or inward, creating a clamp. A single leg would not hold securely because it could pull straight out.
Why does a stapler need an anvil?
The anvil is the metal plate under the paper with two curved grooves. When the staple legs hit it, the grooves force the legs to bend inward and upward. Without the anvil, the legs would just poke straight through and not clinch.
Can a stapler run out of staples?
Yes. Staples are loaded into a magazine inside the stapler. A spring pushes them forward so each one is ready under the driver blade. When the magazine is empty, the driver hits nothing and no staple is driven.
What is the difference between a stapler and a hole punch?
A hole punch removes a small circle of paper and leaves a hole. A stapler pushes a metal staple through the paper and bends its legs to hold the sheets together. The staple remains in the paper as a fastener.
Why do staples sometimes jam?
A jam happens when a staple is misaligned or bent before it is driven. It may get stuck in the magazine or between the driver and anvil. Clearing the jam usually involves opening the stapler and removing the deformed staple.

Part of the guide: Everyday Machines →