SU115047A1 - Involute marking device - Google Patents

Description

For marking involutes, instruments are used based on the use of a semicircle with a degree scale attached to the marking part and a rotary ruler.

However, the known devices of this kind give insufficient accuracy of the markup and require a complex calculation of the coordinates of the evolvent points.

In order to eliminate the above drawbacks, according to the invention, it is proposed to make the rotary ruler movable relative to the semicircle and provide at the end with a movable line in the iperpendicular direction that carries the center punch. The tip of the center pivot is set at the desired point through the readings 1; the values of the central angle are on the semicircle scale, the radius of the basic circle of the involute is on the swivel ruler, and the radius of curvature is in the direction of the horizontal curve.

The drawing shows a diagram of the proposed device.

The device consists of a semicircle / degree scale, attached to the marked part in the center of the main circle, and a swivel ruler 2, associated with the nonius 5 semicircle 1. The ruler 2 is made movable relative to the nonius 4; at its end, a basement is installed on the perpendicular and straight line 5, the layer of core 9.

The punch 6 is intended for marking the profile in the process of construction, since its point is the point that describes the involute.

The construction of the evolvent points using the proposed instrument is performed at a central angle equal to the sum of the pressure angle and the polar angle of a point, and along the radius of the involute curvature at that point. The central angle is counted on a semicircle degree scale / The radius of the main circle, corresponding to an evolve data, is set to rotational liiike 2. The radius of curvature of an involute at this point is counted on a ruler 5 bearing a center punch.

Subject invention

The device for marking an involute with the use of a semicircle fixed to the marked part with a degree scale n swiveling 115047-2

Neuki, characterized in that, in order to mark accuracy and simplify the calculation of the coordinates of the evolvent points, the swivel ruler is movable relative to the half-hull and fitted with a ruler bearing in the perpendicular direction, the edge of which is set at the desired point by counting the center angle on a semicircle scale, the radius of the main circumference of the zolve; read along the turning line and the radius of curvature in the ruler,) esui1, a corner for it.