mechanical pencil

Abstract

The invention belongs to the field of automatic pencils and particularly discloses an automatic pencil which aims to be reasonable in design, simple in structure, convenient to use, capable of replacing pencil leads of different types, strong in universality and capable of adjusting the length of the pencil leads exposing outsides. The automatic pencil comprises a pencil tube with a cavity. A pencil lead inlet / outlet communicated with the cavity in the pencil tube is arranged at the bottom end of the pencil tube. A spindle support is arranged in the pencil tube, a spiral sliding groove is arranged on the spindle support, a pencil lead pressing head capable of turning along the spiral sliding groove is clamped in the spiral sliding groove, a pencil lead is pressed on the pencil lead pressing head, and the pencil lead pressing head drives the pencil lead to move downwards. Top threads of the pencil tube are connected with a fixed tube. An elastic pressing part used for limiting axial displacement of the spindle support is arranged on the fixed tube and the spindle support. A driving device used for driving the spindle support to move is arranged in the fixed tube.

Description

technical field [0001] The invention belongs to the field of mechanical pencils, in particular to a mechanical pencil. Background technique [0002] Pencil is a kind of special pen class used for writing and drawing sketches. It has a history of more than 400 years. Existing pencils are generally divided into two categories, a common pencil and a mechanical pencil. The ordinary pencil is that the pencil manufacturer presses the lead with a wooden rod. This kind of pencil needs consumers to cut out the nib before using it. Mechanical pencils, as the name suggests, can automatically or semi-automatically produce refills. [0003] Whether the existing pencils are ordinary pencils or mechanical pencils, a pen can only use one diameter or type of refill, as shown in the figure, it needs to use other refills, and more than one person needs to have many different types of pens, so that users can use them Very inconvenient and practical. [0004] In addition, the existing mechan...

AI Technical Summary

Problems solved by technology

[0003] Whether the existing pencils are ordinary pencils or mechanical pencils, a pen can only use one diameter or type of refill, as shown in the figure, it needs to use other refills, and more than one person needs to have many different types of pens, so that users can use them Very inconvenient and practical

[0004] In addition, the existing mechanical pencils generally use a mechanical pressing structure to control the core of the pencil, so the length of the pen core pushed forward by each press is fixed, which will cause the pen core used to leak outside to be too long or too short, and the user It is very troublesome to adjust during use, which affects the use process

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