SU1223267A1 - Teaching-aid device on projection drawing - Google Patents

Abstract

The invention improves the didactic properties of the demonstration of comparison of the projection of the coordinate planes with the Monge diagram in the training device in projection drawing. The device contains a geometric body 2, a screen 3 for demonstrating the Monge plot, a projector 4, a carrier of the projected image of the body projections and an optical system with mirrors 5. Two mutually perpendicular and perpendicular to the base 1 and 6 and 7 planes are connected to the base 1 projections, one of which is connected to the screen with a right angle 3. The optical axis of each projector 9 passes through the center of the planes 6 and 7 and screen 3. The exit mirror 5 of the optical system is installed, under the base 1. This base, plane 6 , 7 and 8 projections and screen 3 are full of translucent material, and the carrier of the projected image is in the form of a closed film 10, the distance between frames of which corresponds to the distance between the projectors 9. 1 il. L7 / J

Description

The invention relates to teaching and engineering instruments for conducting teaching descriptive geometry, drawing and engineering graphics.

The purpose of the invention is to increase the didactic properties of the demonstration of the comparison of the projection of the coordinate planes with the Monge plot.

The drawing shows a diagram of the training device.

The projection drawing training device contains a horizontal base 1 for mounting the geometric body 2, a screen 3 for demonstrating the Monge plot, a projector 4, a carrier for the projected image of the body projections and an optical system with mirrors 5. The training device also has two mutually perpendiculars associated with the base 1 6 and 7 projections and a horizontal plane 8, perpendicular to the base of the plane 6 and 7, one of which is connected to the screen 3 under the right angle, as well as additional projectors 9, each optical axis is The first of which passes through the center of the planes 6 and 7 and the screen 3. The output mirror 5 of the optical system is installed under the base 1, the base 1, the planes 6-8 of the projections and the screen 3 are made of translucent material, and the carrier of the projected image is the form of a closed film 10, the distance between the frames of which corresponds to the distance between the projectors 9.

The drive of the film 10 consists of an electric motor 11, a pulley toothed drum 12 and guide rollers 13, while the drum 12 and the guide rollers 13 are mounted vertically at a height equal to half the height of the screen 3.

Training device works as follows.

Before the start of the demonstration, the training device is charged with a closed film 10, on which there are positive images of several geometric bodies, corresponding to their projections (frontal, horizontal and profile) and Monge. Geometrical body 2 is placed on the transparent base 1. Projectors 4 and 9 are switched on. At this, on the plane of 6-8 projections, images corresponding to the frontal, horizontal and profile projection are projected onto the screen 3.

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the projections of the geometric body 2, and its Monge diagram, with the luminous flux entering the horizontal plane 8 of the projections from below after reflection from three mirrors 5, each of which changes its direction by 90.

If another geometrical body 2 is placed on the base 1, then by means of the drive of the film 10 it is rewound until images corresponding to the installed geometrical body 2 are projected on the plane of 6-8 projections and the screen 3.

A standard black and white or color reversible film or film can be used as a film, the images of which are obtained by photographing with a conventional photo camera. Photographing is done from viewpoints, which provide images corresponding to the frontal, horizontal, and profile projections of the model. Separately, on the same film, photographs of Monge are taken for each volume model.

Claims (1)

A training device for projection drawing can improve the quality of learning by providing in-depthness in explaining key issues of projection drawing. Invention Formula A training device for projection drawing, containing a base for mounting a geometric body, a screen for demonstrating Monge’s plots, a projector, a carrier of a projected image of body projections and an optical system with mirrors, distinguished by the fact that, in order to improve the didactic properties of the demonstration comparing the projections of the coordinate planes with the Monge plot, it has two mutually perpendicular and perpendicular to the base projection planes connected to the base, one of which is connected to the screen at right angles to The additional projectors, the optical axis of each of which passes through the center of the planes and the screen, and the output mirror of the optical system is installed under the base, the base, the projection planes and the screen are made of translucent material, and the carrier of the projected image is in the form of a closed film, the distance between frames of which corresponds to the distance between the projectors.