RU1828473C - Sewing needle - Google Patents

Abstract

The invention relates to constructions of needles of sewing machines and allows to expand functionality by creating a compressed relief. The device consists of a rod with a groove, in the lower part of the rod there is an eye and a tip, which ends in a pyramid. The upper part of the rod passes into the flask, which ends with an end. The surface of the pyramid has a roughness corresponding to 7-8 grades of purity 5 silt. 2 tab

Description

The invention relates to constructions of needles for sewing machines.

The aim of the invention is to expand the functionality of the needle by creating a compressed relief.

This goal is achieved by the fact that in the needle, consisting of a rod passing into the point in which the eye is made, and the flask, on four sections, in the adjoining part of the point of blunting and blunting, four faces are formed, located at an angle of the longitudinal axis the needle is symmetrical on both sides of the axis of the sim. metrics (forming two symmetrical pairs: C-S and 3-B) (north-south, west-east or right-left, front-back with respect to the location of the eyelet and its edges and grooves. A six- and octagon for needles with numbers are allowed No. 140-No. 170. atreugolnik for needles with numbers Zh $ 0-Mg190, with diameters of 0.35; 0.4; 0.5; quadrangle for needles with numbers N; 80-N; 170.), connected by equal lateral sides closing together in an edge and at a point at the apex of a tetrahedral obtuse angle, forming a pyramid whose apofem is equal to 0.49-0.83 mm, and its base, having the shape of four polygon with the radius of

around it a circle equal to 0.3-0.7 mm and a radius of a circle inscribed in it equal to 0.25-0.65 mm, while the lateral surface has a roughness corresponding to 7-8 class of cleanliness.

The novelty of the proposed design is that on four sections, adjacent to the blunting part of the tip and blunting region, four faces are formed, located at an angle to the longitudinal axis of the needle and symmetrically on both sides of the axis of symmetry (forming two symmetrical pairs) (axis of symmetry ( the axis of the needle) abuts against a point at the apex of the tetrahedral angle, and if it is extended, it will go through this point at the apex of the corner. two symmetrical pairs: one on the sides, and the other on the sides where the grooves are placed (a guide on the eye with the edges), pairwise connected by equal sides on the edge and at the point at the apex of the tetrahedral obtuse angle, in the form of a pyramid whose apofeme is equal 0.49-0.83 mm, and its base, having the shape of a quadrangle with a radius

00 N3 00

4

s |

With

with

a circle inscribed in it, equal to 0.25-0.65 mm and a radius of a circle circumscribed around it, equal to 0.3-0.7 mm, while the lateral surface has a roughness corresponding to 7-8 purity class,

Figures 1-4 show the construction of a needle of a sewing machine; figure 5 (a-e) is a new view of the resulting compressed relief.

In Fig. 4, a close-up is a graphical depiction of the profile of a tetrahedral obtuse angle with a rough-grip surface formed by four symmetrically spaced faces (forming two symmetrical pairs), at the end of the working part of the sewing needle of our design. As can be seen from the drawing, in the axial section there is a conical shape.

The type of rough-grip surface is arbitrary.

The proposed construction consists of a rod 1, in which a groove 2 is located, in the lower part of the rod there is an eyelet 3 and a point 4, which ends with a tetrahedral obtuse angle 5. The upper part of the rod passes into a flask b, which ends with an end 7.

The basis is a needle with dimensions: L 39 mm, And 33.9 mm, d 1.7 mm, model 02777-83, bulb design 01, rod 02, tip 02, the shape of the round tip is normal.

By grinding off the edge of the tip adjacent to the blunting and blunting, four faces are formed on four sections, located at an angle to the longitudinal axis of the needle symmetrically on both sides of the axis of symmetry (forming two symmetrical pairs), connected by equal side sides in the rib and at apex of a tetrahedral obtuse angle, forming a pyramid having a certain height (apofemy) and a rough-tenacious surface, which is a determining indicator like others, including the one above Islenyev, to perform a new function of the sewing machine needle - creating a new type of compressed relief.

It was experimentally established that the optimal values are the sizes of the parameters of a tetrahedral obtuse angle having the shape of a pyramid, the apofem of which is 0.49-0.83 mm, and its base having the shape of a quadrangle with a radius of the circle described in it equal to 0.3- 0.7 mm, and a radius of inscribed circle in it equal to 0.25-0.65 mm, while the lateral surface has a roughness corresponding to 7-8 class of cleanliness.

It is at these values that the needle performs puncturing, covering new zones, compressing, contracting with each face, edge of a tetrahedral obtuse angle (instead of the edge of a blunted area in the form of a circle or ellipse), which, individually in their own way, form a form of compression piercing fabric.

Using elementary geometry, a relationship was established between the apotheme size at, on which each face is pulled together, forming a tetrahedral obtuse angle, the perimeter of the base of the pyramid p, radius R (r) of the circumscribed and inscribed circles :.

a 2 VR

the pyramids.

a - side of the base

2 n R sin «1 2 n rtg (a 180 2« 1 - angle of the polygon

(",").

n

0

5

0

5

0

5

p is the perimeter of the base of the pyramid: ai bcos 5 a 30 ° or 45 °; a 2s; c b at a 30 °;

ai - apothem of the pyramid; and - the side of the base polygon.

The data obtained for various values of the input optimal parameters and their values are given in Table 1.

The surface roughness classes are given in Table 2.

By choosing the values of H and h, R and g, a new type of compressed relief can be obtained with varying degrees of suitability. For various values of these parameters and their values, a new type of compressed relief is obtained.

The needle works as follows. When pressed and pierced by a tetrahedral angle having the shape of a pyramid, with a rough-chain surface and located on the end of the working part of the needle of the sewing machine, the strands of fabric are tensioned, which is strengthened, transitions to the fabric by tightening, and is maintained at the time of puncture of the fabric. Forming a new type of compression at the moment of tension of the fabric threads, turning into a collection, is preserved after the treatment of the fabric by piercing.

A new type of compressed relief is created by alternating puncture lines together with the puncture sites where the collection is formed, and between them.

Thus, under the influence of a tetrahedral obtuse angle having the shape of a pyramid, a new type of compressed relief is obtained on the fabric, which, depending on the pattern,

piercing, may have the varieties shown in FIG. 5.

5 (a) - the relief pattern is formed by wave-like puncture lines at an angle to the warp and weft threads, between the puncture lines there is an increased tightening of the weft threads, which are grooves originating from the puncture sites, in the form of converging pulling threads, forming noticeable corners. Compression of the relief of a new type is formed by the working end of the needle with the parameters: R 0.7 mm, g 0.65 mm, apofeme height 0, 83 mm;

5 (b) is a drawing of a compressed relief figuratively by the arrangement, alternation of wave-like and straight puncture lines parallel to the warp or weft threads. With increased tension of the fabric threads at the puncture sites, the fabric was treated with the parameters of a sewing needle: R 0.6 mm, g 0.55 mm. apofema 0.71 mm;

5 (c) —compressed relief is obtained by straight puncture lines at an angle to the warp and weft threads. Strong undulation between the puncture lines with alternating gaps in and out of the puncture sites. A new type of relief was created by the optimal parameters of the needle of the sewing machine: R 0.5 mm, g 0.45 mm; apofem height 0.67 mm;

5 (d) - a new type of compressed relief is formed by sparse puncture lines with wave-like torsion of the tissue threads between the puncture lines with the participation of

sewing machine needle parameters: R 0.4

mm; g 0.35 mm, apofeme height 0.58 mm;

5 (d) - the relief of the new species is formed

rarely cell-like with wave-like elements located between themselves of puncture lines with normal torsion with the participation of the following parameters of the sewing machine needle: R 0.3 mm; g 0.25 mm; apofem height 0.49 mm;

5 (f) - a drawing of a compressed relief of a new type is formed by combined puncture lines with the participation of two needles alternately with repeated piercing with parameters: R 0.3 mm; g 0.25 mm; height

apothems equal to 0.49 mm; by repeated piercing to increase the randomness of the lines

puncture with a needle of a sewing machine.

Claims (1)

The claims Sewing machine needle made in in the form of a rod with a point and an eye at one end and a bulb at the other, characterized in that. in order to expand the functionality by creating a compressed relief, the rod is made at the tip in the form of a regular tetrahedral pyramid with two pairs of symmetrical faces, the apofem of each face of which is 0.49-0.83 mm, and the radius of the circle circumscribed around the base of the pyramid is 0.3-0.7 mm, while the lateral surface of the pyramid has a roughness corresponding to 7-8 classes of cleanliness. Table 1 table 2 AND Figure 1 &.