SU923889A1 - Rapidograph - Google Patents

Description

The invention relates to mechanical engineering, namely to writing devices, pen which is designed as a hollow tube, rapidograph, and can be used for computer-aided drawing writing viscous liquid ^{5 * * * *} bone.

Known rapidograph, comprising a housing, a cylinder installed in it, having a tip, terminated by a writing tube, connected to a needle ^{10, a} spring-loaded hollow madren with a load located in it and a rod,

located in the cavity of the needle [1).

The disadvantage of the known rapidograph is the lack of weight unloading of the writing needle in the work, which does not allow to use it at high drawing speeds.

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The purpose of the invention - expansion dia ^'20

Raphograph drawn pattern

lines both in their thickness and in drawing speed.

2

The goal is achieved in that rapidograph containing disposed in the housing cylinder with a writing fluid, associated with a cylinder tube and a writing means for regulated tion _with a fluid supply tube, the latter is designed as a Unidirectional, the piston of which is rigidly connected to the cylinder and valve means the pipe is connected to the cavity of the housing.

The drawing shows the proposed rapidograph, section.

The rapidograph includes a housing 1 with a lid 2 screwed on top, a cylinder 3 with a recording fluid, a writing tube 4 and means for adjusting the flow of fluid into the tube, made in the form of a pneumatic throttle consisting of a cylinder 5, guide bushings 6, piston washers 7 with restrictive rings 8, a bypass valve 9 and the pipe 10.

3 923889 4

Rapidograph works as follows.

Along the body guides · 1, the instrument is installed into the head socket using a software or manually controlled machine ₅ and fixed. The cylinder 3 with the writing liquid and the recording tube 4 mounted on the bottom is inserted into the housing 1 from below along the guide sleeves 6 until the washer-piston 7 is fixed in 10 between the spring-loaded restriction rings 8 installed in the slots of the cylinder 3.

When drawing, the upper part of the housing 1 is supplied with compressed air, 15 which exerts pressure on the writing fluid in the cylinder 3, which is open at the top. Partially, the pressure is released through the drainage hole in the upper part of the body, and ₂₀ its other part through the connecting pipe 10 9 is fed into the cavity of the lower part of the housing 1, bounded by the pressed-in sleeve 6 below, and from above by the 25 fixed on the cylinder 3 by a washer piston 7, so that the compressed air exerts pressure on the washer-piston 7, unloading the cylinder 3. ohm necessary condition osuschestvle- ₃₀ Nia weight balloon 3 with the writing discharge tube 4

^ρ δ ^{7 Pg} 1? And about ΐ

where a _sh - the area of the washer-piston in the plane ^; 35

Ας - cross-sectional area

cylinder with writing fluid;

Pr) _ - air pressure in the bottom

cavity housing 1;

- air pressure in the upper cavity of the housing 1; ·

Ρς is the weight of the balloon with the writing tube filled with the writing fluid. ·

Part of the air pressure is discharged from the lower cavity of the housing 1 through the gap formed by the washer piston 7 and the housing 1, and through the drainage hole in the upper part of the lower cavity of the housing 1. The weight unloading of the cylinder 3 is set using the bypass valve 9.

The use of a pneumatic throttle and the use of a replaceable standard syringe needle as a recording tube greatly expands the range of lines drawn by the rapidograph, both in terms of drawing speed and thickness.

Claims (1)

Claim A rapidograph containing a cylinder with a writing fluid, connected with a balloon of a writing tube and means for adjusting the flow of fluid into the tube, in order to broaden the range of lines to be drawn, the means for adjusting is made in the form of a pneumatic throttle is connected to the cylinder, and the valve is connected to the body cavity through a nozzle.