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A manual prism sharpener generates long fan-shaped shavings Video of a mechanical pencil sharpener, showing gearing and helical sharpening blades video showing a manual prism sharpener A pencil sharpener (or pencil pointer , or in Ireland a parer or topper [ 1 ] ) is a tool for sharpening a pencil 's writing point by shaving away its worn surface.
It was eventually awarded 55 patents, including for electric erasers, pusher lawn mowers and razor blade sharpeners. 1935 – Introduction of first hand-held high-speed rotary tool, called the Moto-Tool. 1939 – The Dremel Moto-Saw was developed. 1964 – Introduction of the Dremel electric engraver.
A number of blade sharpeners operate a mobile business, [1] [2] traveling to their customers locations, often in highly equipped vehicles. Less common in developed nations. Still very common in many areas of the world, skilled craftsmen provide a roadside sharpening service for kitchen knives and cleavers, scissors, and sometimes other blades.
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These machines usually have pedals for speeding up and slowing down the stone to control the sharpening process. The earliest known representation of a rotary grindstone, [6] operated by a crank handle, is found in the Carolingian manuscript known as the Utrecht Psalter. This pen drawing from about 830 goes back to a late antique original. [7]
According to F. Lisheng and T. Qingjun, the hand-crank of the rotary quern was different from a crank, which was the combination of a hand-crank and a push-and-pull connecting rod by a hinge. [ 7 ] The Antikythera mechanism, dated to around 200 BC, [ 25 ] [ 26 ] used a crank as a part of its mechanism. [ 27 ]
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