EP0735174A2 - Aguille à clapet pour des machines de fabrication de tricot - Google Patents

Aguille à clapet pour des machines de fabrication de tricot Download PDF

Info

Publication number
EP0735174A2
EP0735174A2 EP96103544A EP96103544A EP0735174A2 EP 0735174 A2 EP0735174 A2 EP 0735174A2 EP 96103544 A EP96103544 A EP 96103544A EP 96103544 A EP96103544 A EP 96103544A EP 0735174 A2 EP0735174 A2 EP 0735174A2
Authority
EP
European Patent Office
Prior art keywords
tongue
needle
slot
slot part
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96103544A
Other languages
German (de)
English (en)
Other versions
EP0735174A3 (fr
EP0735174B1 (fr
Inventor
Wolfgang Schmoll
Siegfried Wissmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Groz Beckert KG
Original Assignee
Theodor Groz and Soehne and Ernst Beckert Nadelfabrik KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Theodor Groz and Soehne and Ernst Beckert Nadelfabrik KG filed Critical Theodor Groz and Soehne and Ernst Beckert Nadelfabrik KG
Publication of EP0735174A2 publication Critical patent/EP0735174A2/fr
Publication of EP0735174A3 publication Critical patent/EP0735174A3/fr
Application granted granted Critical
Publication of EP0735174B1 publication Critical patent/EP0735174B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/02—Knitting tools or instruments not provided for in group D04B15/00 or D04B27/00
    • D04B35/04—Latch needles

Definitions

  • the invention relates to a latch needle for machines for producing knitwear, with a shaft carrying a needle hook at one end, which contains a tongue slot extending in the longitudinal direction of the shaft, and with a needle tongue pivotably mounted in the tongue slot about a tongue axis, the tongue slot in the area below the tongue axis has a breakthrough to the back of the needle shaft and is delimited on both sides by elastically deformable cheek pieces which have contact surfaces for associated contact surfaces on the tongue back in the area of the upper edges of the tongue slot and the tongue slot is divided into parts of different widths.
  • the shaft cheeks Due to the interaction of the needle shaft cheeks flanking the longitudinal slot with wedge-shaped flanks on the back of the tongue, the shaft cheeks are elastically spread apart when the needle tongue hits, with friction occurring simultaneously on the contact surfaces. As a result, the impact is considerably damped, which protects both the tongue and the needle shaft.
  • the wedge shape of the contact surface on the back of the tongue already exists when the back of the tongue is rounded in the usual way. In addition, this design ensures that the tongue remains in the fully open position and retains its free mobility in this position, ie does not become jammed between the needle shaft cheeks.
  • This latch needle has proven itself extremely well in practice. However, it requires a precise positioning and correct design of the shape impression forming the contact surfaces for the needle back on the top of the needle shaft. In addition, as the needle shaft becomes thicker, the elastic deformability of the shaft cheeks is reduced.
  • a latch needle known from DE-A1 3 335 908 is also designed, in which the latch slot is divided into two parts, of which a first part provided with a breakthrough below the latch axis has the width in the usual manner in accordance with the dimensions of the
  • the needle tongue is dimensioned and a second slot part adjoining this first slot part on the side facing away from the needle hook has a smaller width than the first slot part having.
  • the width of the narrower second slot part is approximately 0.5 to 0.8 times the width of the first wider slot part.
  • the contact surfaces for the needle back are arranged on the upper edge of the second narrower slot part, which also has an opening to the needle back.
  • the narrowing of the tongue slot leads to correspondingly thicker cheek pieces and reduced elastic deformability.
  • a tongue needle known from DE-A1 4,324,232 has also been used the two cheek pieces are designed to be completely separable, from the contact surfaces to the back of the shaft.
  • the width of this continuous opening can be larger, equal to or smaller than the width of the tongue slot in the region of the tongue axis. If this breakthrough extends in the longitudinal direction of the shaft to below the tongue axis, as is expedient in view of proper lint removal, there is a risk that the tongue bearing will become unstable.
  • the object of the invention is to improve the latch needle known from DE-C3 2 714 602, which has been tried and tested in practice, in the sense that it places less demands on the design of the contact surfaces for the back of the tongue during manufacture, and in particular with thick needles without endangering the Tongue storage results in increased damping of the impact of the tongue on the contact surfaces of the needle shaft.
  • the latch needle mentioned above is designed according to the invention in such a way that the latch slot, seen from the needle hook, has a second slot part of greater width after the narrow first slot part containing the opening, in the area of which the support surfaces are formed and which is deeper than that half of the shaft height and below the contact surfaces on the needle back is closed and that a third slot part adjoins the second slot part, which is narrower than the second slot part.
  • the width of the first slot part in the area of the tongue bearing is matched in the usual way to the dimensions of the needle tongue, in such a way that it is movable without damping and is guided laterally to the required extent.
  • the fact that the subsequent second slot part is wider, the shaft cheek areas delimiting this slot part are elastically deformable to a greater extent, with the result that, even with thick needles, the impacting tongue is properly damped to the extent required for high-speed operation.
  • these contact surfaces are correspondingly smaller, the precise design and positioning of the associated shape impression in the cheek pieces only being of secondary importance because the flexible slot walls formed by the cheek pieces beat the blow Effectively cushion the tongue in the reserve. Since the tongue slot below the contact surfaces is closed and the length of the opening to the back of the needle shaft below the tongue bearing only needs to have the length required for good lint removal, the needle is characterized by perfect stability.
  • the third slot section adjoining the wide second slot part on the side facing away from the needle hook is made narrower with regard to the stability of the needle. It provides a laterally flexible support for the narrow and highly flexible shaft cheeks in the area of the second wide slot part.
  • the contact surfaces for the back of the tongue expediently lie substantially above the lowest point or the deepest region of the second slot part, i.e. in a section in which there are usually optimal elastic deformation conditions for the cheek pieces.
  • the length of this second slot part can be chosen appropriately; it usually projects beyond the end of the open needle tongue lying on the support surfaces. Otherwise, at least the second slot part is advantageously curved in an arcuate manner on its bottom wall in the longitudinal direction of the shaft, but the arrangement can also be such that the second and / or third slot part is delimited by an essentially straight surface area near the opening to the needle back, which is followed by a curved surface area tapering towards the upper side of the shaft.
  • the dimensioning of the width of the three slot parts is, as already mentioned, determined by the dimensions of the needle tongue in the first slot part, while in the second and third slot parts it is chosen depending on the needle dimensions in such a way that optimum damping properties for the needle tongue result.
  • a ratio of the width of the first slot part to the width of the second slot part in the range of approximately 2: 3 to 2: 5 has often proven to be expedient, while the ratio of the width of the third slot part to the width of the second slot part is advantageous in can range from about 7: 4 to 7: 6.5.
  • the tongue needle shown in the drawing in the detail is punched out of steel strip and has a shaft 1 to which a needle hook 3 is connected at one end via a throat 2 and which carries in the usual way at least one needle foot (not shown in the drawing).
  • a longitudinal tongue slot 5 is formed which is symmetrical to the plane of symmetry 4 and in which a needle tongue 6 is pivotally mounted.
  • the needle tongue 6 is mounted on a tongue axis 7 which either consists in the form of bearing pins pressed out inwardly from the shaft cheeks 8 which delimit the tongue slot 5 on both sides or consists of a separate cylindrical bearing axis which is held at the ends in the shaft cheeks 8.
  • the tongue 6 is formed with a tongue spoon 9 which, when the tongue is closed, engages over the tip of the needle hook 3, as shown in broken lines in FIG. 1.
  • the tongue 6 can be pivoted between the mentioned closed position, shown in broken lines in FIG. 1, and a fully open position, shown in solid lines in FIG. 1, in which it takes up a reserve and rests on contact surfaces 11 with contact surfaces 10 on the back of the tongue spoon 9, which are arranged on the shaft 1 in the region of the upper edges 12 of the tongue slot 5.
  • the recessed contact surfaces lying on both sides of the tongue slot 5 are formed in the shape of the contact surfaces 10 on the back of the spoon 9 of the tongue 6 corresponding shape impressions in the shaft 1.
  • the contact surfaces 10 on the back of the tongue spoon 9 are in turn designed as wedge-shaped flanks, the normal rounding on the back of the tongue spoon possibly being sufficient for this purpose.
  • the tongue slot 5 is subdivided into three parts 13, 14, 15 which, viewed from the needle hook 3, are arranged adjacent to one another in the longitudinal direction of the shaft:
  • the first slot part 13 contains the tongue axis 7 and has an opening 16 to the shaft back 17 below the tongue axis 7. It is curved in a circular arc, its radius being indicated at 18 in FIG. 1.
  • the width of the first slot part 13, designated by 19 in FIGS. 2, 3, is chosen with regard to the width dimensions of the tongue 6 so that the tongue 6 is guided laterally in its undamped pivoting movement about the tongue axis 7. This lateral guidance ensures that the tongue spoon 9 rests properly on the tip of the needle hook 3 in the closed position.
  • the second slot part 14 is also curved in a circular arc, its radius of curvature being designated by 20 in FIG. 1.
  • the center of curvature 21 lies on an imaginary line 22, which is oriented at right angles to the shaft back 17 in the region of the two contact surfaces 11, which are evidently formed in the region of this second slot part 14.
  • the second slot part 14 is deeper than half the shaft height. It is then closed at the opening 16 towards the back of the shaft by a web-shaped shaft part 23, the minimum height of which is indicated at 24 and lies on line 22. This ensures that the two contact surfaces 11 are located above the lowest point of the second slot part 14.
  • the width of the second slot part 14 indicated at 25 in FIGS. 2, 3 is substantially larger than the width 19 of the first slot part 13.
  • the ratio of the width 19 of the first slot part 13 to the width 25 of the second slot part 14 is in the range of approximately 2 : 3 to 2: 5, preferably 2: 3.
  • the length of the second slot part 14 in the longitudinal direction of the shaft is dimensioned such that the second slot part 14 protrudes beyond the end of the tongue 6 located in the reserve in the manner shown in FIG. 1, while on the other side it comes close to the tongue axis 7 is enough; it also depends on the circumstances of the respective latch needle, in particular the shaft height and the shaft thickness.
  • the third slot part 15 is also curved in the shape of a circular arc, its radius of curvature being indicated at 26. As a rule, it is considerably larger (twice and more) than the radius of curvature 18 of the first slot part 13 and the radius of curvature 20 of the second slot part 14.
  • the two radii of curvature 18, 20 are generally approximately the same size or the radius of curvature 20 of the second slot part 14 is larger (by 10 to 40%) than the radius of curvature 18 of the first slot part 13.
  • the third slot part 15 is for the back of the shaft 17 closed and causes an extension of the web-like shaft part 23 formed by the second slot part 14, the minimum height indicated at 27 being of the order of magnitude of the minimum height 24 of the second slot part 14, so that overall in the manner shown in FIG. 1 results in a substantially flat surface area which delimits the two slot parts 14, 15 on the bottom side along the web-like shaft part 23 and its extension. It is then adjoined by a curved surface area 28 with which the third slot part 15 runs out to the upper side of the shaft.
  • slot parts 14, 15 and also the slot part 13
  • the slot parts 14, 15 are not exactly in the form of an arc of a circle, but rather, for example, in sections, by moving the milling cutter producing the respective slot part in the longitudinal direction of the shaft.
  • the third slot part 15 is narrower than the second slot part 14. Its width is indicated at 29 in FIGS. 2, 3 and is selected in practice so that the ratio of the width 29 of the third slot part 15 to the width 25 of the second slot part 14 is in the range of about 7: 4 to 7: 6.5.
  • the length of the third slit part 15 is chosen in view of the elastic deformability to be achieved in the area of the contact surfaces 11. However, the third slot part 15 always projects in the longitudinal direction beyond the wider second slot part 12.
  • the tongue 6 strikes the contact surfaces 11 with the wedge-shaped contact surfaces of the back of its tongue spoon 9. Since these are arranged in the area of the particularly wide second slot part 14, ie in an area in which the cheek pieces 8 are thinner and thus more elastic, the impact of the tongue is damped properly. Because of through the larger slot width due to the greater distance between the two support surfaces 11 from each other, the tongue back can penetrate correspondingly deeper into the slot part 14, so that the exact position of the shape impressions containing the support surfaces 11 is not so important. These effects are further optimized by the fact that the contact surfaces 11, as already mentioned, lie immediately above the lowest point (at 24) of the curved - or in the case of a straight slot part above the deepest area - slot part 14.
  • the above-described design of the tongue slot 5 with three differently wide slot parts or sections 13, 14, 15 is intended in particular for high-performance needles for large and small circular knitting machines, in particular for needles with a larger needle thickness, for example from 0.48 mm. However, it can also be used for latch needles with a smaller thickness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP96103544A 1995-04-01 1996-03-07 Aiguille à clapet pour des machines de fabrication de tricot Expired - Lifetime EP0735174B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19512375A DE19512375C1 (de) 1995-04-01 1995-04-01 Zungennadel für Maschinen zur Herstellung von Maschenware
DE19512375 1995-04-01

Publications (3)

Publication Number Publication Date
EP0735174A2 true EP0735174A2 (fr) 1996-10-02
EP0735174A3 EP0735174A3 (fr) 1997-03-05
EP0735174B1 EP0735174B1 (fr) 2001-06-13

Family

ID=7758620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96103544A Expired - Lifetime EP0735174B1 (fr) 1995-04-01 1996-03-07 Aiguille à clapet pour des machines de fabrication de tricot

Country Status (5)

Country Link
US (1) US5609045A (fr)
EP (1) EP0735174B1 (fr)
JP (1) JP2929523B2 (fr)
CA (1) CA2172770C (fr)
DE (2) DE19512375C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101941122B1 (ko) * 2018-08-27 2019-01-22 이일영 편기용 니들 및 이를 갖는 환편기

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049061B4 (de) * 2004-10-08 2006-08-24 Groz-Beckert Kg Zungennadel
EP1767678B1 (fr) * 2005-09-22 2008-03-26 Groz-Beckert KG Aiguille à tricoter pour métier à tricoter
EP1870502B1 (fr) * 2006-06-21 2009-07-29 Groz-Beckert KG Aiguille à clapet pour machine textile formant des mailles
EP3604651A1 (fr) * 2018-08-03 2020-02-05 Groz-Beckert KG Aiguille à clapet

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031867A (en) * 1958-07-28 1962-05-01 Groz & Soehne Theodor Latch needle for knitting machines or the like
DE2714607C3 (de) * 1977-04-01 1983-12-08 Theodor Groz & Söhne & Ernst Beckert Nadelfabrik KG, 7470 Albstadt Zungennadel für Maschinen zur Herstellung von Maschenware
JPS5415055A (en) * 1977-07-06 1979-02-03 Fukuhara Needle Co Ltd Composite needle and its production
JPS6044416B2 (ja) * 1982-10-04 1985-10-03 福原ニ−ドル株式会社 メリヤス針
DE3331030C1 (de) * 1983-08-27 1984-10-04 Theodor Groz & Söhne & Ernst Beckert Nadelfabrik KG, 7470 Albstadt Zungennadel fuer Maschinen zur Herstellung von Maschenware
DE3331031C2 (de) * 1983-08-27 1985-07-11 Theodor Groz & Söhne & Ernst Beckert Nadelfabrik KG, 7470 Albstadt Zungennadel für maschenbildende Textilmaschinen
DE4324232C2 (de) * 1993-07-20 2002-05-29 Sipra Patent Beteiligung Zungennadel für Maschinen zur Herstellung von Maschenware

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101941122B1 (ko) * 2018-08-27 2019-01-22 이일영 편기용 니들 및 이를 갖는 환편기

Also Published As

Publication number Publication date
CA2172770A1 (fr) 1996-10-02
DE19512375C1 (de) 1996-06-20
CA2172770C (fr) 1999-04-13
EP0735174A3 (fr) 1997-03-05
DE59607062D1 (de) 2001-07-19
EP0735174B1 (fr) 2001-06-13
US5609045A (en) 1997-03-11
JP2929523B2 (ja) 1999-08-03
JPH08269852A (ja) 1996-10-15

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