Digitized extendable-and-retractable teaching aid compasses

Abstract

The invention relates to digitized extendable-and-retractable teaching aid compasses and belongs to the technical field of teaching aid compasses. The Digitized extendable-and-retractable teaching aidcompasses comprise a first-level outer shell, a second-level outer shell, a third-level outer shell, a circle center fixing mechanism, a chalk fixing mechanism, a sensor, an encoder, a display screen, a spring and an optical grating strip, wherein the first-level outer shell, the second-level outer shell and the third-level outer shell are each in a groove shape; the circle center fixing mechanism is fixed into the first-level outer shell; and the chalk fixing mechanism is mounted in the third-level outer shell in a sliding manner. The second-level outer shell is mounted on the first-level outer shell in a sliding manner. The third-level outer shell is mounted on the second-level outer shell in a sliding manner. The circle center fixing mechanism comprises a suction disc with an optical shaft. The suction disc is fixed to the end of the optical shaft. One end of the spring is wound on the optical shaft, and the other end of the spring is fixed to the chalk fixing mechanism. The optical grating strip is fixed to the spring. Chalk is mounted on the chalk fixing mechanism. The sensor is in signal connection with the encoder. The encoder is in signal connection with the display screen. By means of the compasses, a circle can be drawn on a blackboard.

Description

technical field [0001] The invention relates to the technical field of teaching aid compasses, in particular to a digital scalable teaching aid compass. Background technique [0002] Most of the teaching aid compasses currently on the market are mechanical, and the size is judged almost by naked eyes. When drawing a circle of a certain size, a ruler is needed to measure the distance between the two feet to obtain the radius. Get the desired circle. This kind of compasses is troublesome to draw a circle, and it is difficult to use for petite teachers and students, and because the size is observed by the naked eye, the error is large. Although there are also some telescopic compasses on the market, it is inconvenient to stretch, and it is also inconvenient to fix the center of the circle, which not only hurts the blackboard, but also cannot be read accurately, and cannot be popularized. And digital compasses also can't realize on teaching aids because of its limitation. Co...

AI Technical Summary

Problems solved by technology

This kind of compasses is troublesome to draw a circle, and it is even more difficult for petite teachers and students to use, and because the size is observed by the naked eye, the error is large

Although there are some telescopic compasses on the market, it is inconvenient to stretch, and it is also inconvenient to fix the center of the circle, which not only hurts the blackboard, but also cannot be read accurately, and cannot be popularized

But digital compasses also can't be realized on teaching aids because of its limitation.

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