A function curve drawing instrument for classroom teaching

Abstract

The invention discloses a function curve drawing instrument for classroom teaching. The function curve drawing instrument comprises a main frame, bases, a rocking rod, a pen placing device, an amplitude adjustment device, a frequency adjustment device, an objective table, a slideway and a sliding plate. When the function curve drawing structure is in use, the rocking rod is rocked manually to transmit power to the frequency adjustment device through a corresponding shaft; the transmission ratio is changed through the frequency adjustment device, and the power is transmitted onto the objective table and the amplitude adjustment device through corresponding shafts, gears and bevel gears; through two corresponding gears on the objective table, the power on the objective table is transmitted onto gear racks under the sliding plate, so as to achieve transversely displacement of a pen in the direction of the gear racks; according to the crank shaft sliding block principle, the power on the amplitude adjustment device is transmitted to the pen placing device, so as to achieve vertical swing of the pen in the direction perpendicular to the gear racks. The function curve drawing instrument adopts a crank shaft sliding block, so that the crank shaft length can be changed when the pen is swung, that is, the swing amplitude of the pen is changed and the oscillation of a function is obtained; through the frequency adjustment device, the transmission ratio between two displacements is changed, that is, the to-and-fro swing speed of the pen can be changed and the frequency of the function can be adjusted.

Description

technical field

[0001] The invention relates to teaching aids for classroom teaching, in particular to a sine and cosine function curve drawing instrument for classroom teaching using mechanical principles. Background technique

[0002] At present, when studying physical waves and sine-cosine functions in middle and high schools, it is relatively abstract and difficult to understand. In teaching, teachers can only use the method of drawing points to solve the image, and can only draw by hand, which not only has low accuracy, but also creates certain obstacles for the formation of students' learning curves. In the current technology, there is no tool that can directly generate a sine-cosine function image, let alone conveniently and effectively adjust the frequency and amplitude of the function image. For the calculation of the intersection point of the curve, the calculation of the frequency and amplitude, the students can't master it well. Contents of the invention [0...

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