RU1812251C - Needle for stitching machine - Google Patents

Description

The invention relates to designs for needles for sewing machines.

The purpose of the invention is to expand the functionality of the needle by creating a relief with a modified degree of compression in various areas of collection.

Figure 1 shows the proposed needle; figure 2 is a view along arrow a in figure 1; in Fig.Z - node in Fig.1; figure 4 is a view along arrow B in figure 1; figure 5 (a-e) - views of the obtained relief with a modified degree of compression in various zones selected ™.

In Fig. 4, a close-up is a graphical representation of the profile of the rough-grasping surface of the working part of the sewing needle, the design proposed by us. As can be seen from the drawing, in the axial sections from right to left and vice versa, there is a congruence of two dihedral obtuse angles symmetrically located on both

sides from the longitudinal axis of the needle and the receiving part to blunt the tip and blunt area. The type of rough-grasped surface is arbitrary. The proposed needle consists of a rod

1. in which groove 2 is located, in the lower part of the rod there is an eye 3 and a point 4 ending in two symmetrical faces 5 and a blunt part 6. The upper part of the rod passes into a flask 7, which ends with an end 8. A needle with dimensions is taken as the basis : L 39 mm, I - 33.9 mm, d 1.7 mm, model 0277-33, bulb design 01, stem 02, tip

02. The shape of the tip of the round is normal.

By grinding the surface in the adjacent part to the blunting of the tip area, two congruent faces are formed, having a height of 0.45-0.95, located at an angle to the longitudinal axis of the needle and located symmetrically (to the right and left) on both sides of the needle, each from which00 hO

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rykh, joining with blunting with the same sides in the rib, form two congruent dihedral obtuse angles equal to 120-150 ° and located symmetrically (to the right and left) on both sides of the needle axis, which is also the axis of symmetry; the face of a dihedral obtuse angle, located perpendicular to the longitudinal axis of the needle, has a height equal to 1 / 4-3 / 4 of the radius of the congruent symmetric sector, equal to 0.3-0.8 mm, while the surface of each congruent symmetrically located angle has a roughness corresponding to 7-8 cleanliness class.

The blunted area consists of two isosceles congruent triangles symmetrically located, the base of each of which is equal to the side of the face adjoining it (a - b) and connected to each other at the points at the apex of each corner, of which the triangle is omitted, in each triangle, the height is 1/31/4 of the radius of congruent symmetrically located sectors on both sides of the axis of symmetry, which are the joint heights at the points at the apex of the angles of two isosceles congruent symmetric triangles, xc faces of the dihedral, blunt congruent symmetrical angles equal value equal to 120-150 °. The decisive indicators for performing a new function - creating a tissue relief - are: the height of each symmetrical face located at an angle to the longitudinal axis of the needle, the height of each face located perpendicular to the longitudinal axis of the needle, dihedral symmetrically located on both sides of the axis of symmetry, whose surface is rough-chain.

It was experimentally found that the optimal values are sizes, expressed in quantities:

1. The height of each face is 0.45-0.95 mm and is equal to 1 / 4-3 / 4 of the radius, two of which are located (symmetrical) at an angle, and two are perpendicular to the longitudinal axis of the needle, two dihedral congruent symmetric angles equal to 120-150 °, having a roughness corresponding to 7-8 kliss of purity, located symmetrically (right and left) on both sides of the axis of the needle (axis of symmetry).

It is with these values that the needle, when piercing, pulls the threads of the fabric (warp and weft) into a puff, which

The essence of compiled ™ is compressibility

and Yves rips fabric.

 Using elementary geometry,

established the relationship between the value

h to which grinding

tip, the height of the symmetrical face hi, value ri2, the radius of the cross section of the tip R.

1.hi2.h2 + h2a:

10

2.h hrcosa 30 °; hi h / cosa30 °; hi h / cos a 45 °: hi - h / cos «60th.

The data obtained for various values of the input quantities are summarized in Table 1. Regarding the issue of a rough-chained surface with a characteristic in the number of output data, in accordance with generally accepted standards, we give

table 2. ,

By selecting the values of h, hi, and R, a relief with a varying degree of compression in various areas of the selected ™ can be obtained. For various values of these values, tissue injury, i.e. its rupture is not observed. .:

The needle works as follows. When piercing, the strands of fabric are tensioned at the moment of pressing on

fabric with two dihedral congruent obtuse angles symmetrically located (right and left) on both sides of the needle axis on the working part of the needle point with a rough-grasped surface. The weaving of the threads of the fabric is maintained at the time of puncture, which becomes a collection of puffs, and persists after the piercing of the fabric is completed.

Relief with a varying degree of compression in different zones of the collected ™ is created by alternating puncture sites, puncture lines taking into account the formed zones of collected ™ and between the puncture lines without the participation of bobbin and shuttle threads. The degree of tissue damage depends on the interaction time of the end of the working part of the needle of the sewing machine and the fabric, and decreases with a reduction in this time.

This statement, formulated for the partial case, comes from the general mechanical principle, according to which the change in the momentum of the system (i.e., the value equal to the product of mass and speed) is equal to the momenta of the force (i.e., the product of the force acting on the body and time act force). In this situation, the force with which the end of the working part of the needle of the sewing machine acts on the fabric can be considered constant, independent of

the speed of the part, but the interaction time decreases in proportion to the speed of the end of the working part of the needle of the sewing machine. From this it is obvious that an increase in the speed of the end of the working part of the needle of the sewing machine will lead to a decrease in the force impulse, and, therefore, to a decrease in the change in the tissue impulse, i.e. to reduce tissue deformities.

2.8 In science, the position of a point is often characterized by a certain set of numbers (in particular, on a plane - by two numbers), generally depending on the adopted coordinate system.

We indicate some principles for constructing a coordinate system.

We can assume that in a certain region, in particular, on the entire plane, a coordinate system is defined if there are two families of lines satisfying the following conditions:

I, Each line of each family is assigned one number;

2. Through any point of the selected area passes along one and only one line from each family,.

It is obvious from conditions 1 and 2 that each point on the plane can be characterized (highlighted, distinguishable) with the help of two numbers, mapped to those two lines that pass through this point.

The simplest is a rectangular Cartesian coordinate system - a collection of two families of parallel lines perpendicular to each other (i.e., mutually perpendicular). Each line in the family is assigned a number that is a distance from a fixed line.

To any point on the plane correspond (by condition 2) two lines from different families passing through it, and (by condition 1) - two numbers corresponding to these lines. Since there are no other lines other than the two indicated by condition, any Only two numbers can be associated with a plane point.

Lines corresponding to families do not have to be straight (and do not have to intersect at right angles). A simple example (in which, however, the perpendicularity of the lines is preserved) is the so-called polar coordinate system, which represents a collection of rays emanating from a certain point O and a collection of circles centered at the same point.

0

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5

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5

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5

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5

Obviously, the conditions stated above are satisfied if each circle is associated with a number that is its radius, and each beam has an angle between them and a fixed beam.

It is important to note that any coordinate system is purely abstraction, but is accepted in the specifics, in this case: in the deformation of the fabric under the influence of the pressure of the rough-chain surface of the end of the working part of the needle of a certain shape, when one coordinate system (rectangular) passes into another coordinate system (curvilinear) located in one another or adjacent to one another. .

Thus, under the influence of the rough-grasping surface of the working end of the needle of the sewing machine, which is in the form of symmetrically arranged two congruent obtuse angles (right and left), a compressed relief is obtained, which, depending on the possibility and artistically arranged puncturing lines and the degree of compression in different areas of collection, may have varieties shown in figure 5.

A general characteristic of the relief patterns with a varying degree of compression in different acquisition zones is characterized by the fact that in all three acquisition zones harmonic compression of strong fit with normal and moderate is observed. At the puncture site, there is a clear tightening of the puff with lumen elements, which is created by compression on both sides of the puncture site of the weft or warp threads.

5 (a) - the relief is formed by puncture lines that are slightly wavy, emanating radially from one point, located at an angle to the warp and weft threads, observing the symmetry of the puncture lines emanating from several points and intersecting each other. In places of puncture, a puff is pronounced, forming gaps between the weft threads, and the warp threads are collected in a compression clot.

.. 5 (b) - the relief pattern is formed by asymmetric wavy lines emanating, in contrast to (a), from one point with asymmetry. Strong tightening of the warp and weft threads at the puncture site combined with moderate tightening between the puncture lines creates harmonies in the pattern against asymmetrically arranged puncture lines.

5 (c) - the figure represents a strong undulation along the puncture lines with a tightening clot at the puncture sites. Between

puncture lines normal undulating contraction.

5 (d) - the figure represents the wave formation of the puncture line located parallel to the weft threads and at an angle to the weft and warp threads. Strong puff tightening in the first zone of the fitted ™.

5 (e) is a wave of piercing lines parallel to the warp or weft threads, between which, in the second zone, there is a strong pattern.

5 (e) - the figure represents the zigzag-shaped puncture lines at an angle to the warp and weft threads, strong pulling in all the zones ™ fitted.

Characterization of the material used for the compressed relief.

1.Atlas, lining silk, nylon, white, acetate silk, lake, fine artificial silk, staple, cotton.

The pad is not used; only one layer of fabric is processed. ..

The compressed relief obtained using the proposed needle design with a varying degree of compression in various areas of collection can be used in light industry for the manufacture of garments: jackets, raincoats, suits, skirts, blouses, hats, hats, etc. ., as well as finishes with

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other materials: piercing, suede, fur, etc.

SUMMARY OF THE INVENTION The needle of a sewing machine is made in the form of a rod with an eye at one end and a bulb at the other, characterized in that, in order to expand functionality by creating a relief on the fabric with a varying degree of compression in different areas of the collection, adjacent to the end needles with the eye of the part there are two symmetrical congruent faces having a height of 0.45-0.95 mm and located at an angle to the longitudinal axis of the needle, each of which, being joined with the end with the same sides in the rib, form two congruent two octagonal obtuse angles equal to 120-150 ° and disposed symmetrically to the longitudinal axis of the needle, and a blunt face of a dihedral angle located; on the perpendicular to the longitudinal axis of the needle, has a height equal to 1 / 4-3 / 4 of the radius of the congruent symmetrical sector, equal to 0.3-0.8 mm, while the surface of each congruent symmetrically located dihedral obtuse angle has a roughness corresponding to 7- Grade 8 cleanliness.

with

Table 1

table 2