A Clever Mechanism Inside This Japanese Mechanical Pencil Keeps the Leads Sharp

Here’s another Japanese design that skirts the line between “Good gosh that’s clever” and “Do we really need this?” By utilizing thin, perfectly-cylindrical leads, mechanical pencils obviate the need for sharpening. But if you were to zoom in on the tip, you’d see that even the narrowest lead can alternate between blunt and sharp as it wears down.

Source: A Clever Mechanism Inside This Japanese Mechanical Pencil Keeps the Leads Sharp

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