EP1285113A1

EP1285113A1 - Sewing-machine needle

Info

Publication number: EP1285113A1
Application number: EP01936316A
Authority: EP
Inventors: Johann Willems; Herbert Jansen
Original assignee: Rhein-Nadel Maschinennadel GmbH
Current assignee: Groz Beckert KG
Priority date: 2000-05-30
Filing date: 2001-05-03
Publication date: 2003-02-26
Anticipated expiration: 2021-05-03
Also published as: JP2003534854A; WO2001092629A1; BR0106677B1; PT1285113E; CZ299928B6; DE10026576A1; AU6225501A; CZ2002287A3; KR20020067491A; KR100694324B1; CN1218080C; DE50112643D1; CN1386149A; EP1285113B1; BR0106677A

Abstract

The invention relates to a sewing-machine needle (1) comprising a shank (3) which extends from a butt (2). A thread groove (11) running in the direction of the butt (2) and originating at the eye (8) which lies on the side of the point, is provided on the peripheral surface of said shank. The base (12) of the groove is configured as a curved surface (W) which lies transversally to the shank (3) and the lateral flanks (15) of said groove, which start from the end point of the curved area, form a groove cross-section (16) which extends towards the peripheral surface (4). The aim of the invention is to achieve a robust construction comprising a practical grooved contour for guiding the thread. To achieve this, the diameter (D) of the circular arc contour of the curved surface (W) corresponds approximately to the radius (R) of the shank (3).

Description

00001 sewing machine needle 00002

00003 The invention relates to a sewing machine needle

00004 with a shaft starting from a piston, which on

00005 of its lateral surface - starting from the tip side

00006 Öhr - at least one in the direction of the piston -

00007 de thread gutter, the groove base as in transverse

00008 designed curvature surface lying in the direction of the shaft

00009 and its starting point from the dome end

00010 side flanks spread out towards the lateral surface

Shape the vertical channel cross section. 00012

00013 A sewing machine needle with a classic round shaft cross

00014 cut is known from DE 3149383 AI (Fig. 4).

00015 The thread channel is of rectangular contour; the parallel

00016 liter running side flanks are over a right

00017 angularly aligned gutter base, also as

00018 flat edge, connected. 00019

DE-PS 193 006 is a trapezoidal thread gutter

00021 contour can be removed. The side flanks diverge to

00022 outer surface. This leads to a significantly wider

00023 th channel cross-section. The channel bottom is predominant

00024 flat and goes over a short concave fillet

00025 fertilizer in the wall sections of the side flanks.

00026 In addition to a round cross-section of the shaft

00027 of this sewing machine needle in diametrical opposite position

00028 a relatively flat addition to the thread groove

00029 tongue groove assigned (Fig. 3). 00030

00031 DE 32 35 153 AI shows a generic sewing machine

00032 NEN needle, the groove base as in the transverse direction of the

00033 shaft lying bulge surface is designed, which

00034 adjoins diverging side flanks

00035 and which side flanks one to the outer surface Form 00036 widening channel cross-section (Fig. 11a). The

00037 Rinnengrund is, more like a notch valley, relative

00038 closely shaped. 00039

Knowing these requirements, the invention has the

00041 task, a sewing machine needle of the schil-

00042 the most common with a thread-guiding channel contour

00043 more resilient to turning load

To train 00044 forces. 00045

00046 This task is first and foremost

00047 a sewing machine needle with the characteristics of the

00048 claim 1 solved, it being based on the fact that the

00049 diameter of the arcuate curvature of the

00050 Wolbungsflache approximately corresponds to the radius of the shaft.

00051 The bottom of the gutter obtained from this lacks the tightness,

00052 is so low in frictional heat and still leaves it

00053 so much residual cross-section that the shaft is not

00054 is weak. The curvature is in one

00055 depth that the zone around the shaft-peripheral

00056 semicircle for the desired enlarged gutter

00057 cross section can be designed. Even the broken

00058 table transition areas have lost their notch effect

00059 ren. The corners are "ironed out". About the generous

00060 concave curvature creates conveniently located restricted areas

00061 against turning forces, both in Öhrrich

00062 tion as well as across it. There is a considerable

00063 stiffening effect. It is advantageous that the

00064 curvature of the Wolbungsflache designed in this way

00065 is that two of one in the shaft cross section beyond

00066 of the shaft center and on the longitudinal median plane of the

00067 shaft lying point (vertex) at the

00068 course of the tangents (tangent

00069 point) a widening free space cross section and

00070 a smaller or maximum equal area, above 00071 of the tangent application point lying gusset section

Define 00072 which one is shaped

00073 through the curve line of the curve surface and other

00074 on the one hand through the tangent, created in the crown of the bulge

00075 and the radial and perpendicular to it

00076 straight line running the tangent point, parallel

00077 lying to the through the center of the shaft and the

00078 center of curvature extending longitudinal center plane. The

Material taken away for distribution is quasi

00080 filling the corner and thus reducing the notch breaking

00081 added part of the channel bottom. It educates

00082 the generously concave rounded foothills of the

00083 trough cross section. The cross-sectional relationships

00084 are the difference in the area sizes of the

00085 widening clearance cross-section to the gusset section

00086 maximum a little less than 30%. Another advantage

00087 adhesive solution reached through one of the thread trough in

00088 known complementary complement gutter

00089 smaller cross section with a curved base and

00090 a mouth width approximately the clear mouth width

00091 the thread gutter, the side flanks of which are obtuse

00092 enter the outer surface of the shaft. Such

00093 supplementary channel is less deep than the usual

00094 before long thread trough. The concave curve shape bears

00095 to achieve a polydirectional wall alignment

00096 of the shaft and thus to increase the resistance

00097 of the opposite forces. Such sewing machine

00098 nen needles or a so-called double channel needles

00099 practically have a double-T profile, the gutter

00100 forming transitions in the manner described

00101 lent a notch effect. It is

00102 it is favorable that with two opposite one another

00103 thread channels of the same geometry, according to the characteristic

00104 sign of the second claim, the vertices

00105 of the created tangents in the area of the longitudinal shaft 00106 telachse, the center, meet or even overlap 00107. 00108 00109 The subject matter of the invention is explained in more detail below with reference to 00110 of a graphically illustrated embodiment example. It shows: 00112 00113 FIG. 1 a sewing machine needle realized as a double trough needle in view, as seen against a 00115 thread trough, enlarged, 00116 00117 FIG. 2 the section according to line II-II in FIG. 1, 00118 00119 FIG. 3 is the bottom view of the sewing machine needle, and 00120 is seen against the fillet, 00121 00122 00127 sewing machine needle as double channel needle, 00128 00129 Fig. 6 the same in geometric modification (the 00130 cut hatching 'is omitted in these two representations). 00132 00133 The sewing machine needle 1 which can be produced in the classic reduction process by means of a cold press by cold stretching as a blank, can be produced in 00135 by machining or can even be largely reworked by 00136 compression molding / trimming is 00138 circular cross section. This applies to the cross-section 00139 larger piston 2 as well as the largest length 00140 section occupying shaft 3 of the sewing machine needle

00141 1.00142

00143 With regard to the shaft cross section, see FIG. 4

00144 to 6 referenced. There is the cylindrical surface

00145 the same designated 4. 00146

00147 The piston 2 goes over a frustoconical approach

00148 5 in the significantly reduced cross-section shaft 3

00149 above, which ends with a needle tip 6. 00150

00151 The needle tip 6 extends in the eye-side end

00152 cut 1 'of the sewing machine needle 1. The actual one

00153 top is 7. The eye is designated 8. Before that

00154 ben is the so-called fillet 9. The latter

00155 forms an enlarged gripper space for the not

00156 shown gripper of a sewing machine. 00157

00158 In the back of the groove 9, that is, on the one hump 10

00159 opposite side, a thread trough 11 runs

00160 Rinnengrund means 12. 00161

00162 The thread trough 11 runs between the eye 8 in the end

00163 cut 1 'and the approach 5 continuously and essentially

00164 chen of the same depth. Only the approach side

00165 end area wedges on the truncated cone surface of the

00166 approach 5 going out. The piston 2 itself is even

00167 cylindrical. But it could also be slightly conical

00168 or tiered. Its free end section carries that

00169 reference number 1 ''. This piston-side end section

00170 is chamfered. 00171

00172 in a cross-sectional diametrals of the shaft 3 points

00173 this on the side facing away from the thread groove 11

00174 a thread groove 13. It is less radial 00175 depth than the thread groove 11 and has an expression,

00176 as shown in Fig. 5 or such as it

00177 from FIG. 4, realized there as a supplement

00178 tongue groove 14. 00179

00180 The further thread groove 13 is spatially in front of the eye 8

00181 final, there or on the one hand by the mentioned

00182 ten hump 10 and on the other hand by the opposite of the

00183 groove surface of the shoulder 5 increasing in depth.

00184 Here, too, there is the

00185 ten wedges. 00186

00187 The longitudinal extent of the channels 11, 13, 14 is

00188 matching, namely parallel to a longitudinal center axis

00189 se x-x center Z of the shaft 3. 00190

00191 With regard to the bending forces absorbing, relatively thin

00192 stalked shaft 3 is on a stable design

00193 respected, which the resilient resilience as well

00194 provides a sufficient thread guide cross section

00195 especially with regard to the thread channel 11. 00196

00197 The groove base 12 is as in the transverse direction of the shaft

00198 3 lying curvature surface W designed. It takes less

00199 than a semicircular arc. Curvature region-end

00200 points pass into side flanks 15. Take the latter

00201 diverging course and thus produce

00202 before 4 a widening channel cross section 16. The

00203 lies above the diameter D of the circular arc

00204 curvature of the curvature surface W. The opening angle

00205 kel between the side flanks 15 is approximately 20 to

00206 30 °. The course of 15 is mirror-symmetrical. 00207

00208 The diameter D of the arcuate bulge

00209 essentially corresponds to the curvature surface W. 00210 the radius R of the basically circular cross-section

00211 pointing shaft 3 of the sewing machine needle 1. 00212

00213 The center of the bulge in the drawing to a

00214 complete circle closed vault surface W

00215 bears the reference symbol y. 00216

00217 The arching of the channel base 12 in a concave,

00218 circular geometry is set so that the

00219 center of curvature y still in the basic cross section of the

00220 shaft 3, but the radius of the circle is deep

00221 is not exhausted moderately. 00222

00223 The distance to the center Z can be seen. It corresponds

00224 essentially half the radius of the diameter D. 00225

00226 The center Z of the shaft 3 and the bulge

00227 point y of the circular curvature surface W run in

00228 a common longitudinal median plane E-E. In this diamonds

00229 also lies on the other side of the shaft 3

00230, for example, the further designated 13 above

00231 right thread channel of the double channel sewing machine needle 1. 00232

00233 The curvature of the curvature surface W is the

00234 art designed that two of one in cross-section

00235 beyond the center Z of the shaft 3 and on the

00236 said longitudinal center plane E-E of the shaft 3 lying

00237 point Pl to the tangent T applied to the curvature

00238 a widening clearance cross section 17 and one

00239 smaller or at the same area, above the

00240 tangent contact point 19 lying gusset section

Define 00241 18. Both the widened channel cross

00242 cut 16 or broadening yielding gutter entrance

00243 free space cross section 17 as well as the mentioned gusset

00244 cut 18 are shown in the form of hatched fields 00245 represents. For comparison, one is shown

00246 right-angled thread channel of common type

00247 gusset sections 18 fill the right-angled corners

00248 the thread trough 11 of the old type rounded out concavely. So

00249 corner notches are avoided. The expansion scope

00250 cross section 17, on the other hand, is a widening channel

00251 cut 16 cleared away. The transitions of the

00252 so diverging adjoining side flanks 15 to

00253 lateral surface 4 can, as shown, convex

00254 be rounded. 00255

00256 The gusset section 18 is formed on the one hand by

00257 the curvature line rounding the channel bottom 12, that is

00258 curvature area W, and on the other hand defined by the

00259 Tangent T, created in the crest 19 and the

00260 at right angles (angle Alpha) to the radial 20

00261 and straight line running through the tangent point Pl

00262 G, lying parallel to that through the center Z of the

00263 shaft 3 and the curvature center y extending

00264 longitudinal median plane E-E. 00265

00266 FIG. 5 shows the additional thread groove 13

00267 a comparable geometry, but the curvature

00268 center y this thread groove 13 further radially

00269 is offset outside, remaining in the longitudinal median plane

00270 E-E. The center of curvature y of this curvature surface W

00271 lies inward just behind that as a continuous one

00272 line imaginary surface 4. The reference numerals are

00273 applied analogously, this without further textual

00274 repetitions. With this constellation they meet

00275 apex of the created tangents T in the area of

00276 shaft center axis x-x, the center Z of the shaft 3

00277, recognizable even in overlapping assignment. The

00278 vertex of the tangents T of the thread groove 13 is with P2 00279 designated. The overlap zone Ü extends from

00280 seen from the thread channel 11, beyond the center Z. 00281

00282 Nonetheless, with respect to the thread groove 13, too

00283 the desired widening channel cross section 16. 00284

00285 With regard to the variant in FIG.

00286 give comparable geometry, at least what the

00287 parameters of the thread trough 11 are concerned. The difference is now

00288 made a design that a larger

00289 overlap area Ü in the longitudinal median plane E-E

00290 hits. The area relating to the further thread groove 13

00291 design corresponds to that explained in FIG. 5. Bezüg-

00292 the thread channel 11, the tangents T are placed so

00293 that the crown of the bulge, i.e. tangent contact point

00294 te 19, from the lower third of the depth of the thread groove

00295 11 are offset to about half the depth. The bulge

00296 vertices produce a vertex labeled P2,

00297 which is moved significantly further from the center Z, but

00298 is still within the cross section of the shaft 3.

00299 The fields also fall differently

00300 large with respect to the cross section

00301 section 17 and the gusset section 18. The former

00302 is smaller in area than the gusset section 18.

00303 probably the one achieved by the curvature surface W

00304 te rounding of the transition areas to the side flanges

00305 ken 15 exist. 00306

00307 With reference to Fig. 5 is a more balanced distribution

00308 recognizable. The difference in the area sizes of the

00309 cross section 17 to the gusset section 18th

00310 is a little less than 30% at most. 00311

00312 Coming back to the variant acc. Fig. 4 still remains

00313 to note that the thread groove there in the form of 00314 supplementary channel 14 strikingly smaller cross-section

00315 is as that discussed in Figures 5 and 6. There here

00316 significantly less than a little less than half the circular

00317 cross-section occurs, but there is also a

00318 determined from the course of the curvature surface W

00319 width, which is about the clear mouth width 16 of the

00320 thread channel 11 or 13 corresponds. 00321

00322 While in the other forms it is in the transition from

00323 side flank 15 to lateral surface 4 to acute angles

00324 gutter edges comes, the supplemental gutter 14 - the

00325 Rinnengrund is denoted by 14 '-

00326 design with respect to these edges recognizable obtuse angle

00327 lig (angle beta). The here from the foothills of the

00328 curvature W faces go as in the

00329 basic version about convex fillets in the man-

00330 telflache 4 of the shaft 3 over. 00331

00332 Test results have been obtained for a single channel needle

00333 shows that the needle is 10% stiffer in the direction of the eye and

00334 was 7% stiffer in the transverse direction. It was about

00335 is a needle which describes the one described in FIG.

00336 had lower thread trough 11. 00337

00338 Tests on a double channel needle as shown

00339 Fig. 5 showed a 25% higher in the direction of the ear

00340 stiffness and 20% higher in the transverse direction

00341 Stiffness of the needle body. 00342

00343 investigations of the needle type shown in FIG. 4,

00344 with a thread groove 11 and the

00345 tongue groove 14 showed a 6% higher in the transverse direction

00346 stiffness. Measured in the direction of the ear, it was 8% weak.

00347 rather. 00348 00349 All disclosed features are (in themselves) inventive

00350 considerably. In the disclosure of the registration is hereby

00351 also the disclosure content of the associated / attached

00352 priority documents (copy of the pre-registration) fully

00353 included in the content, also for the purpose of features

00354 of these documents in claims of this application

00355 to record.

Claims

00356 claims 00357

00358 1st sewing machine needle (1) with from a piston (2)

00359 outgoing shaft (3), which on its outer surface

00360 - starting from the tip-side eye (8) - at least

00361 a thread groove running in the direction of the piston (2)

00362 (11), the channel base (12) of which is in the transverse direction

00363 vault surface (W) lying on the shaft (3)

00364 is and its from the bulge end point

00365 outgoing side flanks (15) one to the mantle

00366 before (4) widening channel cross-section (16)

00367 men, characterized in that the diameter (D)

00368 of the arcuate curvature of the curvature surface

00369 before (W) corresponds approximately to the radius (R) of the shaft (3). 00370

00371 2. Sewing machine needle according to claim 1 or in particular

00372 thereafter, characterized in that the warping

00373 run of the arch surface (W) is designed such that

00374 two of one in shaft cross-section beyond the zen

00375 tru s (Z) of the shaft (3) and on the longitudinal median plane

00376 (E-E) of the shaft (3) lying point (Pl) to the

00377 curvature course created tangents (T) (tangent -An-

00378 legepunkt 19) a widening free space cross section

00379 (17) and a smaller or maximally equal area,

00380 above the tangent contact point (19)

00381 gusset section (18) define which latter

00382 is formed on the one hand by the curve of the curve

00383 exercise area (W) and on the other hand by the tangent

00384 (T), laid out in the arched section and at right angles

00385 (angle alpha) to the radial (20) and through

00386 the straight line (G) running the tangent point (Pl),

00387 lying parallel to that through the center (Z) of the sheep

00388 tes (3) and the center of curvature (Y)

00389 longitudinal median plane (EE). 00390

00391 3. Sewing machine needle according to one or more of the

00392 preceding claims or in particular according thereto,

00393 characterized in that the difference of the area

00394 large of the widening clearance cross section (17) for

00395 gusset section (18) maximum a little less than 30% ^•

00396 is. 00397

00398 4. Sewing machine needle according to one or more of the

00399 previous claims or in particular according thereto,

00400 characterized by one of the thread channel (11) in

00401 complementary channel known to oppose

00402 (14) smaller cross-section with a curved base

00403 (14 ') and a mouth width of approximately the clear coin

00404 width (16) of the thread groove (11), the side flanges

00405 ken (15) at an obtuse angle in the lateral surface (4) of the

Run in 00406 shaft (3). 00407

00408 5. Sewing machine needle according to one or more of the above

00409 arising claims or in particular according thereto,

00410 is characterized by two thread

00411 channels (11) of the same geometry, according to the characteristic

00412 character of the second claim, the apex

00413 points (Pl, P2) of the created tangents (T) in the area

00414 the longitudinal axis of the shaft (x-x), the center (Z),

00415 meet or even overlap (Ü).