KR100685162B1 - Sewing machine needle having an elliptical flattening - Google Patents

Abstract

The present invention relates to a sewing machine needle, wherein the present invention extends from butt (2) and extends from at least one thread groove (6) in the direction of the butt (2) on the side thereof-extending from the point area (5) of the needle. A mirror symmetry, bounded by the first contour region 13 and the semicircular reference line H, which are basic shapes of a semicircle in which the seal groove 6 is dug in at least a portion of the body 3, shank and at least in the longitudinal direction of the body. The needle of the sewing machine consists of a needle cross-section consisting of a second contour area portion 14 in the form of a semicircle having a cross-sectional reduction portion c facing the semi-circle reference line H as compared to the phosphorus semicircle. The object of the invention is achieved by a sewing machine needle, characterized in that the cross-sectional reduction part c is formed by at least elliptical outer boundaries 15, 16, 17, 18 of the second contour area part 14.

Sewing machine, sewing machine needle, elliptical section, thread groove, supplement groove

Description

Sewing machine needle having an elliptic flatness

FIELD OF THE INVENTION The present invention relates to a sewing machine needle, comprising a shank having one or more thread grooves extending from the butt-extending from the point area of the needle and extending in the butt direction on the side thereof, the cross section of the needle. Is defined as a first profiled region in the form of a semicircle with the thread grooves, which is dug in a portion along its length, semicircular baseline and whose basic form is compared with a semicircle of mirror symmetry. A sewing machine needle comprising a second profiled region having a cross-sectional reduction section transverse to a semicircle reference line.

Sewing machine needles with this type of cross section reduction are disclosed in DE 38 10 481 A1 (sections AA and CC). According to this, the cross-sectional reduction provided on the opposite side of the thread groove is formed as a straight flattened in cross section, which extends over the bottom portion of the thread groove projected in the cross-section and the sides of the contour which follow the circular shape in a boundary area which is limited only in close proximity spatially. Leads to. This spatially constrained transform comprises a curvature of the contour which is greatly enlarged in position when compared to the radius of the circle, for example requiring a high level of production cost in compression molding of the cross section of the needle. In addition, the possible size of the cross-sectional reduction section is such that the mechanical range in which the possible range of the cross-section reduction section that crosses the semi-circle reference line crosses the semi-circle reference line between the bottom of the thread groove and its planer flattening portion is applied to the sewing machine needle. It is critically limited by the fact that it requires a certain minimum residual thickness to provide adequate resistance to loads, in particular bending or buckling.

On the basis of this, it is an object of the present invention to develop sewing machine needles of the type described above in a manner that is well improved.

This object is achieved in the first example and in the case of a sewing machine needle having substantially the features of claim 1, said cross-sectional reduction being formed by a preferred elliptical outer boundary of at least the second contour area. Preferably, the second contour area portion is bounded by an elliptical or elliptic contour for this purpose, which continues in the basic semicircular shape of the first contour area portion at the intersection with the semicircular reference line. In addition, as the elliptical boundary contour continues to approach each intersection with the axis of symmetry perpendicular to the semicircular reference line and penetrates the bottom of the thread groove, the elliptical boundary contour proceeding from the intersection with the semicircular baseline is continuously increasing in radius, again. That is, the curvature continues to decrease. In a particular particular configuration, at least one part along the circumferential length, the outer boundary of the second contour region part satisfies the basic equation of the ellipse (the boundary of the ellipse).

Variable (a) refers to the long axis of the two half axes of the ellipse, and variable (b) refers to the short axis. However, within the scope of the present invention, an elliptic or elliptical boundary contour is understood as meaning that there is also a slight deviation, even when compared to the elliptic boundary contour, even if it exceeds the tolerances of the product. By comparison with the comparative cross section in the solid circle of the basic form, the elliptical contour can advantageously achieve the effect in the first example of the reduction in the cross-sectional area, so that the cross section of the needle according to the invention This means that the stitching holes in the material are smaller in the way you want. On the other hand, by having this type of flattening, the maximum cross-sectional width of a solid reference circle in the longitudinal direction of the semicircular reference line is such that the semicircular reference line, i.e., the first contour region portion and the second contour region portion, The fact that it is limited by the cross section reduction transverse to the dividing line therebetween means that the cross sectional resistance is substantially maintained, especially against bending stresses occurring in the sewing direction (ie, in the longitudinal direction of the semi-circular reference line). Means that. As a result of the overall convex shape of the elliptical outer boundary, the need for a significant reduction in the needle cross section, which is larger than in the case of relatively flat planarization, is achieved even while taking into account the minimum distance between the bottom of the thread groove and the boundary such as an ellipse required for stability reasons. If possible, it is possible to avoid the cross-sectional boundary contour of curvature which is stronger than the curvature of the cross section of the circular reference contour, compared to the planar flattening. In technical sewing conditions, ie for the use of the sewing machine needle according to the invention, as the cross-sectional portion is simultaneously reduced, the penetration resistance is also reduced, while in the direction of sewing, ie the direction of traversing the thread groove. The stability of the needle into the furnace is substantially maintained as compared to the comparison needle having a circular cross section. At the same time, small curvatures of the boundary contour and, in principle, shorter circumferences-with relatively the same size of cross sectional area-can be achieved by means of elliptical contours according to the invention when compared with comparative needles with plane cross section reductions in principle. .

In addition, the sewing machine needle according to the present invention provides a suitable space for the end of a looper loop of a looper, a loom book (shuttle, shuttle) or the like and to increase the certainty to avoid skipped stitches. It is preferred to have a scarf extending in the butt direction from the eye of the needle on the point side. For example, the scarf may be constructed in a manner well known as a flat-bed scarf or radial scarf having a scarf contour correspondingly shaped in the longitudinal direction of the sewing machine needle. With respect to the position of the scarf in the cross section of the needle, it is preferred that the scarf is located in the second contour area, more preferably on the opposite side of the outer circumference of the thread groove. In particular, the scarf may be dug in a portion along the length of the sewing machine needle, where the elliptical cross-sectional reduction is carried out according to the invention. Depending on the circumferential position of the scarf selected in cross section and depth of the passageway, the cross section reduction over elliptic or elliptical flattening can be realized in at least a specific area on the needle cross section. In an embodiment in which the elliptical or elliptical flatness and also the cross-sectional flatness through the scarf in accordance with the invention are each aligned transversely with respect to the semicircular baseline, this is simultaneously the sewing direction, i.e. also transversely with respect to the scarf. Stability is maintained despite the flattening according to the invention. In a suitable refinement, the oval or elliptical cross-sectional reduction, running from the area at the point of the needle, for example from the bottom of the cone to the needle point, is longitudinally up to the scarf and more preferably beyond the scarf. As a result, there is a possibility to continue to extend in the direction of the butt. In this way, in particular in order to achieve small stitching holes in the material to be sewn, the limiting of the cross section of the needle affects the entire needle penetration length for the cross section made of the first and second contour areas initially defined. I can receive it.

With respect to the second contour region, it has a basic shape of a semi-ellipse, the longitudinal axis of the semi-ellipse more preferably coincides with the semi-circular reference line (H). Alternatively or in combination, this may be provided such that the transverse axis of the semi-ellipse lies on a common straight line with a line of mirror symmetry of the thread grooves of the cross section of the needle. Preferably, the long half axis of the two half axes on the longitudinal axis of the ellipse is 5-20% longer in length, in particular almost 7%, 10%, or 14% when compared to the short axis. Depending on the preferred size of the stitching holes and according to the better shape of the cross section of the needle, other length ratios may additionally also be suitable.

The cross-sectional boundary shape of the first contour area portion on both sides of the seal groove, which extends from the semicircle reference line with respect to the first contour area portion, follows the circumferential direction beyond the radii of the circle set by the tangent in the cross-sectional shape of the seal groove. It is preferable. In addition, the thread groove preferably extends exclusively only within the first contour region in the cross section of the needle. It is also contemplated that the thread groove has a groove bottom with a concave area that is circularly rounded at the cross section of the needle. With regard to the round thread grooves in this way, reference may also be made to the applicant's German publication DE 100 26 576 A1, the content of which is also embodied by the present application for the purpose of the specified shapes indicated in the claims.

As also described in this foregoing application, a blocking surface is advantageously placed against the bending force in the direction of the eye of the needle and in the direction of traversal of the needle groove of the circular needle body. With respect to the advantageous effect produced by the large concave rounding, it has its own meaning for the present invention, and as a result, even in the case of a needle body with a reduced cross section compared to a circular needle body cross section, the possibility of a decrease in rigidity with shaping It is possible to achieve a reward. However, since a significant reduction in stiffness can be particularly avoided by the flattening of the ellipse or ellipse of the needle body cross section according to the invention, in this regard even one (or more) means of suitably shaped round thread grooves There is a possibility that the rigidity of the body can be obtained much better than the comparative value of the needles of circular contours.

In a suitable improvement, there is a possibility to provide additional thread grooves or supplemental grooves with round groove bottoms in cross section, and to be arranged in the cross section of the needle substantially opposite of the thread grooves excavated in the first contour area. There is also. In this regard, the replenishment groove is arranged in the second contour area bounded in an elliptical or elliptical manner so that the additional stiffness is reduced by the flattening in cross section by the corresponding multidirectional alignment means of the wall. It is preferable to obtain directly in the cross-sectional area. In addition, the additional thread grooves or supplemental grooves described above can contribute to the advantages of the thread guide itself, and better thread guidance is achieved, thereby reducing the risk of thread breakage. As can be seen from the experiments carried out by the applicant, this is quite advantageously achieved by the additional seal groove or supplemental groove which is smaller than the cross section of the groove or the depth of the seal groove, especially at the depth of the groove.

Regarding better preferred possibilities for the placement of the thread grooves and additional thread grooves or replenishment grooves opposite from the thread grooves, and also in regard to the increase in the stiffness of the needle resulting from the experiment of the needles with circular cross sections, Reference may be made by publication DE 100 26 576 A1. The disclosure disclosed in this prior application is also fully embodied in this respect of this application, which is included for the purpose of shape as also embodied from what is in the claims of the present application.

Compared with the seal groove, it is more preferable that the replenishment groove has a cross section of the groove which is small or about the same size. As for shaping or dimensioning, the groove bottom of the seal groove and / or the supplementary groove is made to follow the circular contour in cross section, the diameter of the circular contour being approximately half of the length of the semicircular reference line H. There is a possibility. In an additional configuration, it may be provided that the depth of the supplementary groove is less than or equal to the depth of the seal groove. It is also preferred that the cross sectional opening internal dimension of the replenishment groove is smaller than or substantially the same as the cross sectional opening internal dimension of the seal groove. In order to be also suitable for high cross-sectional loads and to improve a uniform stress distribution in the cross section of the needle, one wing of the replenishment groove and / or seal groove in the cross section of the needle is obtuse with respect to the side of the needle body. When the side flaps of the thread groove and / or the side grooves of the needle cross section are convexly rounded on the side of the needle body, there is an effect of reducing the stress concentration, i.e., a beneficial effect.

In addition, a furstoconical, preferably conical, transition is formed between the body and the butt of the relatively larger cross section, the needle body being flattened or elliptical in accordance with the present invention. In the case of a sewing machine having a cross section, it is also possible that the body will have a fairly uniform cross section at this length part between the diverter and the scarf if it can also be adapted to the point area of the needle. This is true even in the case of a sewing machine having a flattened body cross section according to the invention, which combines thread grooves and possible supplemental grooves to increase the stiffness of the needle, without the need for a separate body part connected with the conversion part and reinforced by conventional methods. Make it possible.

The invention is described below with reference to the accompanying drawings in which preferred embodiments of a sewing machine needle according to the invention are represented.

1 shows a side view of a first preferred embodiment of a sewing machine needle according to the present invention, including some cut away areas.

2 shows a top view of the sewing machine needle of FIG. 1.

3 shows an enlarged first cross-sectional view along section line III-III of the sewing machine needle of FIG.

4 shows an enlarged second cross-sectional view along the section line IV-IV of the sewing machine needle of FIG. 2.

FIG. 5 shows an enlarged cross-sectional view of a second preferred embodiment of a sewing machine needle according to the invention, which is a case more flat like an ellipse compared to FIG. 3.

6 shows an enlarged cross-sectional view of a third preferred embodiment of a sewing machine needle according to the present invention.

Figure 7 shows a side view of a more preferred embodiment of a sewing machine needle with a supplemental groove according to the present invention and without a reinforcing body, including some cut away areas.

FIG. 8 is an enlarged cross-sectional view of the sewing machine needle along the section line VIII-VIII of the sewing machine needle of FIG.

9 shows an enlarged cross-sectional view of another preferred embodiment of a sewing machine needle according to the present invention.

1 shows a side view of a first preferred embodiment of a sewing machine needle 1 according to the invention. This needle has a body 3 extending from the butt 2. In the exemplary embodiment shown, the butt 2 is formed as a round butt, but a flat butt or any other suitable type of butt may also be used within the scope of the present invention. . The body 3 has a thread groove 6 at its side 4, the thread groove 6 extending from the needle point region 5 in the direction of the butt 2 to a reinforcement body region 3 ′. Extending in the direction, the reinforcing body region extends conically into the butt 2. The needle point region 5 extends from the needle point 8 to the needle eye 9 via the adjacent cone 7. The needle eye is connected in the direction of the butt 2 by a scarf 10, which is opposite the thread groove 6 in the cross section of the needle and in the exemplary embodiment is a flat-bed scarf. Is formed. It should be noted that there is another preferred embodiment within the scope of the present invention with respect to the exemplary embodiment, which is merely represented by way of example in FIG. 1, the difference from the first embodiment of which differs from the body region 3 in FIGS. 1 and 2. No additional body strengthening of the kind represented by ') is provided. The body 3 can extend appropriately to butt 2 or to a butt conversion region, respectively, in an elongated cross section, shown in FIGS. 1 and 2. Such a conversion zone, for example a cone conversion zone (of course compared with the conversion section 26 in FIG. 7) connecting the butts 2 in FIG. 2, does not have the characteristics of a conventional reinforcement of the body cross section and extends throughout its length. It remains the same throughout, but shows a gradual change of cross section from the end of the continuously elongated body to the butt of a relatively large cross section.

FIG. 2 shows a plan view of a preferred embodiment of the sewing machine needle 1 according to the invention as viewed in the direction II indicated in FIG. 1. In FIG. 2, section lines III-III indicate a section through the body 3 in front of the scarf 10, the shape of which can be obtained from FIG. 3. In addition, the section line IV-IV of FIG. 2 indicates the section through the body 3 in front of the cone 7, the shape of which can be obtained from FIG. 4. Reference is made to the cross section shown in FIG. 3 below. Reference numeral K denotes a circular contour that functions as a basic or comparative geometric shape indicated by the dashed lines to illustrate its features. Crossing the center of the circular contour K in a direction perpendicular to the plane of the drawing of the cross section is the central axis M, also shown in FIGS. 1 and 2. Two points P1 and P2 face each other on the circumference of the circular contour K, and the half-section cross-sectional boundary contour (first contour area portion) including the seal groove 6 is the point P1. And along circular contour K over portions 11 and 12 along the circumferential length starting from P2), respectively. In this range, the first contour region 13 defined by the connecting line between the points P1 and P2 has a semicircular basic shape, so that the connecting line between the points P1 and P2 is the semicircular reference line H. It can be said. The cross section of the needle also has a second contour region 14, which is in contact with the first contour region 13 according to the semicircular reference line H. Compared with the semicircle arranged along the semicircle reference line H symmetrically with respect to the semicircle described with respect to the first contour region portion 13, the second contour region portion 14 is a cross-sectional reduction portion ( c), the cross-sectional reduction portion transversely with respect to the semicircular reference line H, the elliptical shape of the second contour area portion 14 beyond the periphery between the points P1 and P2 shown in the exemplary embodiment. It is defined by the outer boundary 15. The length or size of the cross-sectional reduction part (c) varies depending on the position projected on the semicircle reference line (H), and the minimum size (Zero) is obtained at intersections of the boundary contour with the semicircle reference line (H). The maximum size is obtained at the vertex S of the second contour region. Along the outer border 15 of the ellipse, the border contour of the cross section of the needle of FIG. 3 is a semi-ellipse, which forms the basic form of the second contour area portion 14 with respect to the indicated coordinate direction. Follows the previously cited elliptic formula with the major half axis of and the b minor axis. In this respect, the basic form meaning an elliptic or elliptical boundary within the scope of the invention extends over some cross section of the second contour area, in particular the inside of the cross section (for example in the form of a scarf, possibly other thread grooves, etc.). This may also apply to the presence of clear deviations, which are directed towards. As shown, in the illustrated exemplary embodiment, the major half axis a coincides with the radius of the circular contour K at the same time. The elliptic outer boundary 15 of the cross section of the needle shown in FIG. 3 in front of the scarf 10 satisfies the basic formula cited for an ellipse, but in the cross section shown in FIG. 4 in front of the cone 7. The elliptic outer boundary 16 of shows a slightly more expanded curved shape compared to the elliptic contour E determined by the equation, and nevertheless, it is possible to cite at least almost elliptic or elliptical outer boundary. In the cross sections of FIGS. 3 and 4, each short half axis of the semi-ellipse has the same length b in each case. Not only does the elliptical cross-sectional reduction extend continuously beyond the scarf 10 in the direction of the butt 2 from the needle point region 5, but in the case of certain exemplary embodiments, in the longitudinal direction of the needle, An ellipse or elliptical vertex line 20 passing through the vertex S of the ellipse means to extend in parallel with the central axis M over the portion along the length. In addition, in the case of the preferred exemplary embodiment shown in Figs. 3 and 4, the major half axes a also have the same length as each other. The major half axis (a) has a length approximately 7% longer than the length of the minor axis (b) compared to the short axis (b). With respect to the first contour region portion 13, portions 11 ′, 12 ′ along the circumferential length made to closely follow the circular contour K are portions 11, 12 along the circumferential length of FIG. 3. There is a deviation between FIGS. 3 and 4 to have a longer length in FIG. 4, with respect to the seal groove 6 in the cross section in front of the scarf 10 compared to the cross section in front of the cone 7. A rather flat transformation follows. In addition, the side blades 21, 22 of the seal groove 6, in front of the scarf 10, are more than the side wings 21 ′, 22 ′ in front of the cone 7 in their upper region. It has a rather flat shape.

5 shows a cross-sectional view of a second preferred embodiment of a sewing machine needle according to the invention in the region of the body 3 corresponding to the position in the section line III-III in FIG. 2 under the conditions of its position. Compared with the cross section shown in FIG. 3, for each equal distance from the y axis, a larger cross section reduction c is employed. With regard to the related semi-ellipse, the major half axis (a) is about 20% longer than the short axis (b).

FIG. 6 shows a cross-sectional view of a third preferred embodiment of a sewing machine needle 1 according to the invention which is likewise related to the position in section line III-III shown in FIG. 2. The boundary surface 23 of the first contour area portion 13 on both sides of the thread groove 6, which proceeds from the semicircular reference line H, is set to the tangent T with respect to the cross-sectional shape of the thread groove 6. Follow the semicircle shape in the circumferential direction so as to pass the radius of the circle. However, the thread groove 6 has a groove bottom face 24 having a recessed portion rounded in a circle at the cross section of the needle. In the actual dimension of this exemplary embodiment, the length of the major half axis a is 0.525 mm and the length of the minor half axis b is 0.46 mm. As a result, in the case of the form of the cross section shown in Fig. 6, the major half axis a has a length of almost 14% longer than that of the short axis b.

In actual dimensions, the sewing machine needle according to the invention is in side view (FIG. 1), wherein the diameter depth of the scarf 10 is preferably approximately 0.69 mm thick at the end of the cone 7 on the needle eye side, And a thickness of approximately 0.78 mm in the body 3 between the scarf 10 and the butt 2, while the radius depth of the scarf 10 is approximately 0.22 mm. In the plan view (FIG. 2), the needle thickness of the body 3 in the portion along the length adjacent to the scarf 10 on the butt side is approximately 0.94 mm, if further away from the scarf 10. 1.01 mm. In the cross section of the needle identified by section III-III of FIG. 2, the maximum size in the y-axis direction shown in FIG. 3 is approximately 0.78 mm in a more preferred embodiment, and the maximum size in the x-axis direction is approximately 0.94 mm. Can be. In this case, the thickness remaining of the cross section in the y-axis direction between the bottom surface of the seal groove 6 and the vertex S of the ellipse may be approximately 0.48 mm. In other words, the depth of the seal groove 6 is about 0.3 mm.

7 shows a more preferred embodiment of the sewing machine needle 1 according to the invention, enlarged in a partially cut longitudinal view. Departing from the embodiments shown in FIGS. 1 and 2, the sewing machine needle 1 shown in FIG. 7 is also located opposite to it in the cross section of the body 3 of the needle, in addition to the thread groove 6 which is also here. It also has a supplemental groove 25. In the longitudinal direction, this replenishment groove 25 is provided in the run-out provided in the region of the conical transition section 26 between the body 3 and the butt 2 of a relatively larger cross section. The boundary is determined on the butt 2 side. The portion along the length defined by reference number 26 is of a relatively large cross-section from the end of the same body 3 over the portion along the length that is elongated over its entire length, ie formed without remaining body reinforcement. A gradual conversion to the butt 2 is shown. At the ends facing in the longitudinal direction, the supplemental groove 25 is bounded by bumps 27 and the convex vertex of the bumps is at the height of the vertex line 20 of the elliptical flatness. It is placed and connected to the eye side by the scarf 10. The indentation of the scarf can be seen as the space between the vertex line 20, which is shown in dashed lines and extends to clarify the embodiment, and the solid edge of the body associated with it in the shaded incision surface. The seal groove 6 also has a gradient finish in the region of the converter 26, and as in the case of the replenishment groove 25, the depth of the groove does not change substantially over each length of the groove. Not shown. As in the case of FIG. 1, the elliptical flatness according to the invention is substantially realized over the entire length of the body 3. Compared with the embodiment shown in FIGS. 1 and 2, the other singularity is that the sewing machine needle shown in FIG. 7 has an area of the reinforced body connected with the conversion unit 26 (compared to reference 3 ′ in FIGS. 1 and 2). Although not, the body 3 connecting the converter 26 has a substantially uniform cross section up to the bump 27.

FIG. 8 shows an enlarged cross section of the sewing machine needle 1 according to the invention shown in FIG. 7 along the section line of VIII-VIII. Also, as in FIG. 9, even if there is a possibility that there is any difference with respect to the actual shape with respect to the individual shapes, such structural shapes which basically coincide with FIGS. 3 to 6 are denoted by the same reference numerals. For example, as far as the seal groove 6 is concerned, The groove bottom is moved radially outward in FIG. 8 in comparison with FIG. 3, and the horizontal wings 21, 22 of the seal groove 6 are relatively steep and have portions 11, 12 along the circumferential length. Substantially follows the circular contour until the seal groove 6 is open to the side. With respect to the position of the cross sections of FIGS. 8 and 9, in order to be identical to the positions in FIGS. 3 to 6, the cross sections of the needles shown in FIGS. 8 and 9 are in direct alignment following the section line VIII-VIII of FIG. 7. It should be noted that it rotates by 90 ° clockwise. In FIG. 8, the supplementary groove 25 is excavated in the elliptical flat second contour area 14 and is disposed opposite the seal groove 6. As in the seal groove 6, the supplementary groove 25 has a round groove bottom surface. The horizontal blades 28, 29 of the replenishment groove 25 form an obtuse angle with an elliptical outer boundary 30 having side or rounded transitions flattened into adjacent ellipses, while the horizontal of the seal groove 6 is horizontal. The corresponding transitions between the vanes 21, 22 and the parts 11, 12 along the circumferential length form an acute angle. In addition, it is apparent that the replenishment groove 25 has a groove cross section smaller than the seal groove 6, and the depth of the groove and the width of the opening are made smaller than in the case of the seal groove 6.

9 shows an enlarged cross-sectional view of another preferred embodiment of a sewing machine needle according to the invention with the position of the cross section coinciding with FIG. 8 in the region of the body. The cross section shown here differs from FIG. 8 by a supplementary groove 25 made relatively deeper and wider. As shown in FIG. 8, in this case horizontal wings 28, 29 are provided which lead to an elliptical or elliptical outer boundary 30 with convex rounding. According to FIG. 9, the depth of the groove is relatively shallow, although the inner opening width of the replenishment groove 25 already roughly coincides with the inner opening width of the seal groove 6. However, there is also the possibility that the seal groove and the supplemental groove may have the same or nearly the same cross section.

All the disclosed features belong to the invention. The disclosure of the associated / attached priority documents (copy of the preceding patent application) is hereby incorporated into the disclosure of the present application and includes for the purpose of incorporating the features of these documents into the claims of the present application.

Claims (18)

A body 3 having a shank having one or more thread grooves 6 extending from the butt 2 and extending from the point area 5 of the needle in the direction of the butt 2 on the side; The cross section is bounded by a semi-circular base line (H) with a first contour area (13) having a basic shape of a semicircle having the seal groove (6) cut in portions along its length, and the basic shape is mirror symmetrical. In the needle of a sewing machine comprising a second contour area portion 14 having a cross-sectional reduction portion c directed laterally with respect to the semi-circle reference line H as compared to a semi-circle of phosphorus, The cross-sectional reduction portion (c) is a sewing machine needle, characterized in that formed by the outer boundary (15, 16, 17, 18) of the elliptical shape of the second contour area portion (14). The cross section reduction according to claim 1, wherein a scarf (10) extending from the eye (9) of the needle on the needle point side in the direction of the butt (2) is provided and proceeds from the needle point area (5). Part (c) is a sewing machine needle, characterized in that extending beyond the scarf (10) in the direction of the butt (2). The sewing machine needle according to claim 1 or 2, wherein the second contour area portion (14) has a basic shape of semi-ellipse shape, and the longitudinal axis of the semi-ellipse coincides with the semicircle reference line (H). . 3. The second contour area portion (14) according to claim 1 or 2, wherein the second contour area portion (14) has a basic shape in the form of a semi-ellipse, wherein the horizontal axis of the semi-ellipse lies on a straight line in common with the mirror symmetric line of the seal groove (6). Sewing machine needle, characterized in that. 4. The sewing machine needle according to claim 3, wherein the long half axis (a) of the semi-ellipse is 5 to 20% longer than the short half axis (b) of the semi-ellipse. 3. The boundary shape of the first contour region portion 13 on both sides of the seal groove 6, which proceeds from the semicircular reference line H, is defined by the cross-sectional shape of the seal groove 6. A sewing machine needle, characterized in that a semicircle shape over a radius of a circle set as the tangent T continues in the circumferential direction. The sewing machine needle according to claim 1 or 2, characterized in that the thread groove (6) in the cross section of the needle extends exclusively in the first contour area portion (13). 3. Sewing machine needle according to claim 1 or 2, characterized in that the thread groove (6) has a groove bottom (24) with a circular round recessed area in the cross section of the needle. 3. The supplementary groove 25 according to claim 1 or 2, having a round groove bottom in the cross section, disposed opposite to the thread groove 6 excavated in the first contour region 13 in the needle cross section. The sewing machine needle characterized by. 10. Sewing machine needle according to claim 9, characterized in that, in comparison with the thread groove (6), the replenishment groove (25) has a groove section of a smaller or equal size. 10. The groove bottom of the seal groove 6 or the replenishment groove 25 is formed so as to follow the circular contour in cross section, the diameter of the circular contour being the length of the semicircular reference line H. Sewing machine needle, characterized in that half. 10. The sewing machine needle according to claim 9, wherein the depth of the refill groove (25) is less than or equal to the depth of the thread groove (6). 10. The sewing machine needle according to claim 9, wherein an inner width of the cross-sectional opening of the supplementary groove (25) is less than or equal to an inner width of the cross-sectional opening of the thread groove (6). 10. The sewing machine needle according to claim 9, wherein the side vanes of the supplementary groove (25) in the cross section of the needle extend at an obtuse angle with respect to the side of the body of the needle. 10. The method according to claim 9, wherein in the needle cross section, the side blades (21, 22, 28, 29) of the thread groove (6) or the replenishment groove (25) are connected to the side of the needle body in a convexly rounded manner. The sewing machine needle characterized by. 3. The converting portion 26 of the prusto cone is formed between the body and the butt 2 of a larger cross section, wherein the body 3 flattened elliptical or elliptical in cross section is Sewing machine needle, characterized in that it has a uniform cross-section in the length portion between the converter 26 and the scarf (10). 10. The groove bottom of the seal groove 6 and the replenishment groove 25 is formed so as to follow the circular contour in cross section, the diameter of the circular contour being the length of the semicircular reference line H. Sewing machine needle, characterized in that half. 10. The method according to claim 9, wherein in the needle cross section, the side flaps (21, 22, 28, 29) of the thread groove (6) and the replenishment groove (25) extend to the side of the needle body in a convexly rounded manner. The sewing machine needle characterized by.

Images