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- Manual pencil sharpener
Manual pencil sharpener
These were high-end models, quite large and expensive. Others simply used abrasives like sandpaper. In some cases an abrasive was used to shape the graphite core, while the wood was cut some other way. The oldest surviving electric pencil sharpener is the Boston Polar Club pencil sharpener, introduced around Auto-stop electric pencil sharpeners are able to sense when the tip of the pencil is long enough, so they stop automatically. In basic automatic pencil sharpeners, the lead may become too long and break, and so users must be careful to supervise the operation.
Artists and craftsmen may use a very sharp knife to sharpen pencils and other media freehand, without the use of any mechanical guides. For example, the tip may be cut into a triangle shape, and then the edges of the triangle are trimmed down.
This technique requires a total of 6 cuts, and takes practice to master without breaking the lead. Specialized sharpeners are available that operate on non-standard sizes of pencil-shaped markers, such as wax crayons used in primary schools.
Sharpeners that have two openings, one for normal pencils and one for larger crayons, are fairly common. Sharpeners with a single blade for use on wax crayons are available, and sometimes included in boxes of crayons.
These often have plastic blades, which are adequate for the soft wax. An artist's or draftsman's pencil sharpener leaves the graphite untouched and sharpens only the wood some models can switch from standard to wood-only by an adjustment.
The graphite lead is then honed to a sharp point with a lead pointer, which sharpens only the lead without wood. Some sharpeners which function as a long point sharpener, have a second hole in which the blade sharpens the untouched graphite to a long, more precise point than would be otherwise possible using a single hole long point sharpener.
Carpenters may use carpenter pencils , the flattened shape of which stops them from rolling away, while still providing a constant line width. These pencils were traditionally sharpened with tools conveniently to hand, such as a plane or sandpaper. Rotating pencil sharpeners are now available for these pencils, in which a rotating plastic collar holds the pencil in position, although they then sharpen to the usual conical point as for a round pencil, abandoning some distinctive aspects of the carpenter's pencil.
Alternatively, a special carpenter's pencil sharpener can be used, which has a sliding mechanism that leaves flat facets on the lead, in a manner similar to hand sharpening with a sharp knife. Mechanical pencils with thin diameter leads dispense the graphite lead progressively during use and thus do not require sharpening; such pencils are sometimes called "self-sharpening". A type of mechanical pencil has a rotating gear mechanism which rotates the lead slightly every time the lead is lifted off the paper, helping to maintain a consistent, sharp point.
If a finer or broader line is needed, a separate mechanical pencil using a lead with a different diameter is required. Hand-cranked planetary sharpener with spring-driven pencil holder. The small knob behind the crank is a sharpness regulator.
AC-powered electric pencil sharpener. The mechanism is similar to the planetary sharpener, except there is a motor instead of a crank. Ecologically manufactured pencil sharpener made of wood. Jump to content Navigation. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. In other projects. Wikimedia Commons. On this Wikipedia the language links are at the top of the page across from the article title. Go to top. Contents move to sidebar hide.
Article Talk. Read Edit View history. More Read Edit View history. Tool for sharpening a pencil's writing point by shaving away its worn surface. Hand-cranked planetary sharpener from to , with cover removed. A wall-mounted planetary sharpener casing removed to reveal the mechanism. Irish Language and Culture.
Lonely Planet. ISBN Archived from the original on 13 November Retrieved 1 March Knight and Lacey. Archived from the original on 2 March L'Imprimerie Nationale. Archived from the original on 18 July Retrieved 9 July Retrieved 3 March Boston Polar Club Pencil Sharpener. Retrieved 28 August Archived from the original on 12 December Cutting and abrasive tools.
This manual pencil sharpener has a high capacity shavings tray to hold a high volume of pencil shavings. Remove it easily for quick cleaning. The easy rotate selector dial fits 8 pencil sizes, making this mechanical pencil sharpener great for schools.
With a durable all-metal construction and die-cast base, this sharpener is built to last. The hand crank sharpener can be wall-mounted using included screws or attached to a tabletop.
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