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Pencil sharpening method and pencil sharpener

A technique for sharpening pencils and pencil sharpeners, applied in sharpening devices, printing, office supplies, etc., can solve problems such as the length of the cone without mentioning it, and achieve the effect of being beneficial to eye hygiene and physical health

Inactive Publication Date: 2013-03-20
刘澈
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3. The pencil standard QB / T 2774-2006 stipulates the diameter of the pencil and the diameter of the refill, without mentioning the length of the cone

Method used

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  • Pencil sharpening method and pencil sharpener
  • Pencil sharpening method and pencil sharpener
  • Pencil sharpening method and pencil sharpener

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] Example one, the application of the present invention on the pencil sharpener, as attached figure 1 , such as a type of pencil sharpener mentioned in the standard GB / T 22767-2008, the cutting tool is a hob.

[0044] When the hob is a single hob, it is called hob a (1), and the pencil cone it cuts is called cone a (2). Hob a (1) will be extended to 30mm-42mm. The busbar (5) is the closest busbar to the pencil axis (4) on the hob a (1). The parallel line (3) passes through a point on the pencil axis (4) and is parallel to the busbar (5). The parallel line (3) is parallel to the pencil axis (4). The included angle of the axis (4) is the included angle of the hob a (1) and the pencil axis (4). The length of the projection on the pencil axis (4) of the intersection line (6) of the cone a (2) and the inscribed cylinder of the cylindrical pencil or prismatic pencil and the pen tip (7) at the place of 0.5 mm in diameter is the cone The length of body a(2). The length of the...

example 2

[0062] Example two, the application of the present invention on the pencil sharpener, as Figure 4 , such as a class of pencil sharpeners mentioned in the standard QB / T 1337-1991, the cutting tool is the blade.

[0063] When the blade is a single blade, it is called blade a (1), and the pencil cone obtained by cutting the pencil is called cone a (2). Applying the above method, the blade a (1) will be extended to 30mm-42mm, and the length of the cone a (2) obtained by cutting is 26.5mm-38mm.

[0064] Pencils with larger diameters are more suitable for longer cones. For pencils of different diameters, it is best that the length of the pencil cone is greater than (d / 2-0.25) / tan(6.5°), where d is the diameter of the pencil in millimeters (mm). For example, for a pencil with a diameter of 7mm, the length of the pencil cone is greater than (7 / 2-0.25) / tan(6.5°)=28.5mm.

[0065] The blade axis (5) is the straight line where the edge of the blade a (1) is located, the parallel line ...

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PUM

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Abstract

The invention discloses a pencil sharpening method and a pencil sharpener, and relates to the pencil sharpening method, particularly that a sharpened pencil cone can help a student to keep a correct pencil holding position and the problem that a pencil holding finger is too close to a pen point is solved. The length of the sharpened pencil cone is 26.5mm to 38mm. The pencil sharpener comprises a cutter b and a cutter c; the cutter b is used for a cone b; the larger end of the cone b starts from the larger end of the pencil cone; the cutter c is used for sharpening a cone c; and the cone c starts from the smaller end of the pencil cone. The length of the pencil cone is adjusted by adjusting distances for the cone b to be connected with the cutter b and for the cone c to be connected with the cutter c. Because the texture and the taper of a sharpened pen holder are different from those of a pen holder which is not sharpened, the correct pen holding position is guided for a user. The pencil sharpening method and the pencil sharpener can be used for training the correct pen holding posture of extensive students, particularly primary school students.

Description

technical field [0001] The invention relates to a pencil sharpening method and a pencil sharpener using the method, in particular, the shape of the pencil after cutting can help students avoid too close distance between fingers and pen tip. Background technique [0002] Pencils are the most commonly used pens for elementary school students. Because they are not proficient in writing, most students tend to hold the pen with their fingers too close to the tip of the pen. The fingers block the line of sight, causing the head to bow or tilt the head. The distance between the eyes and the book is too close, which is likely to cause spinal curvature and myopia. How to keep the proper distance between the finger and the nib, mainly to prevent the finger from getting too close to the nib, has always been a problem. [0003] Existing pencil sharpening methods and pencil sharpeners place cutting tools on the side wall of a tapered tube with a certain degree of taper. The pencil enters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L23/08
Inventor 刘澈
Owner 刘澈