EP0113942B1 - Fadenabschneider für schützenlose Webstühle - Google Patents

Fadenabschneider für schützenlose Webstühle Download PDF

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Publication number
EP0113942B1
EP0113942B1 EP83300218A EP83300218A EP0113942B1 EP 0113942 B1 EP0113942 B1 EP 0113942B1 EP 83300218 A EP83300218 A EP 83300218A EP 83300218 A EP83300218 A EP 83300218A EP 0113942 B1 EP0113942 B1 EP 0113942B1
Authority
EP
European Patent Office
Prior art keywords
yarn
yarn cutter
cutter
loom
cutting
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.)
Expired
Application number
EP83300218A
Other languages
English (en)
French (fr)
Other versions
EP0113942A1 (de
EP0113942B2 (de
Inventor
Hiroyuki C/O Toray Industries Inc. Tatematsu
Haruhiko C/O Toray Industries Inc. Kusakabe
Masamitsu C/O Toray Industries Inc. Takaki
Gendai C/O Toray Industries Inc. Kojima
Sigeru C/O Toray Industries Inc. Miyamoto
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.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8191030&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0113942(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to AT83300218T priority Critical patent/ATE29533T1/de
Priority to EP83300218A priority patent/EP0113942B2/de
Priority to DE8383300218T priority patent/DE3373503D1/de
Publication of EP0113942A1 publication Critical patent/EP0113942A1/de
Application granted granted Critical
Publication of EP0113942B1 publication Critical patent/EP0113942B1/de
Publication of EP0113942B2 publication Critical patent/EP0113942B2/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads

Definitions

  • the present invention relates to a yarn cutter for a shuttleless loom and more particularly to a yarn cutter which is suitable for use as a weft yarn cutter for a water jet loom and superior in corrosion resistance, wear resistance and toughness in a weaving process.
  • Recent water jet looms operate at a very high speed of 400 to 800 rpm and jet 2 to 4 cc of water at every pick. Accordingly, in a yarn cutter employing a metallic blade for cutting weft yarns such as in GB-A-1 121 234, the blade is liable to rust due to the wet operating environment and the cutting performance of the blade deteriorates within a short operating period of time due to repetition of high-speed cutting operation, so that such a yarn cutter has a disadvantage that the durability is unsatisfactory.
  • Some yarn cutters employ an electric heater instead of a metallic blade, however, such yarn cutters also have a problem in respect to durability and often fail in cutting a weft yarn due to cooling of the electric heater by wet weft yarns.
  • the present invention seeks to provide a yarn cutter suitable for a shuttleless loom, which is superior in corrosion resistance, wear resistance and toughness than known such yarn cutters.
  • a yarn cutter for a shuttleless loom comprising a pair of knife bodies each having a cutting edge and being driven for relative sliding motion in mutual contact, characterised in that at least the cutting edge of at least one of the said knife bodies is made of a zirconia ceramic comprising a dispersion of a zirconia containing cubic phase and a zirconia containing tetragonal phase, the latter being present in a proportion of between 5 and 70 mol %.
  • the yarn cutter may be a scissors type or may be a so-called cylinder cutter type consisting of a combination of a cylinder body and a piston body fitted in the cylinder body. As mentioned above, it is preferable that one of the bodies is stationary, while the other is movable in contact with the former.
  • both knife bodies of the ceramic material it is desirable to form the cutting edges of both knife bodies of the ceramic material; however, only one of the cutting edges may be formed of a ceramic material, while the other is formed of a metal such as a sintered hard alloy.
  • at least the cutting edge is required to be made of the ceramic material or the cutting edge and the knife body may inclusively be made of the ceramic material. Forming at least the cutting edge of the ceramic material provides corrosion resistance, wear resistance and toughness, which can not be attained by metal cutters.
  • a shed 3 is formed through the alternate up-and-down motion of a pair of heddle frames 2 guiding a plurality of warp yarns 1 arranged in the shape of a band.
  • a weft yarn 4 is inserted through the shed 3 across the arrangement of the warp yarns 1 and is then beaten up with a reed 5 so that a fabric 6 of a predetermined weft density is formed.
  • the weft yarn 4 is taken out from a cheese 7 at a predetermined unwinding speed by means of a feed roller 8 at a predetermined speed and is pooled temporarily within a vacuum pool pipe 9.
  • the weft yarn 4 thus pooled is then guided through a gripper 10 and jetted out from a jet nozzle 11 together with water.
  • Pressurized water is supplied to the jet nozzle 11 from a water tank 12 by means of a pump 13.
  • the weft yarn 4 is jetted out from the jet nozzle 11 into the shed 3 by the pressurized water.
  • One end of the weft yarn 4 beaten up with the reed 5 is gripped by the gripper 10, while the other end jetted across the loom to the other end thereof is arrested with weft yarn entangling threads 16 to tighten the weft yarn 4 at a fixed tension while the end of the weft yarn 4 is picked up with the weft yarn entangling threads 16 rotated by means of a yarn end entangling means, for instance, a false-twisting spindle 14.
  • Both ends of the weft yarn 4 are cut by yarn cutters 17 of the present invention which are made of a ceramic material and are disposed at the opposite ends of the loom respectively.
  • a water supply pipe 18 is disposed in the vicinity of each yarn cutter 17 to supply water to the yarn cutter 17.
  • Dripping water from the water supply pipes 18 on the corresponding yarn cutters 17 removes textile wastes and dust produced due to the wear of the yarn cutters 17 and mitigates the wear of the cutting edges due to the mutual sliding movement between the cutting edges.
  • the preferable water supply rate is 10 to 100 cc/min.
  • selvage yarns are indicated at 14.
  • the yarn cutter comprises a pair of knife bodies 19 and 20 having cutting edges 19a and 20a on the mutually opposite sides thereof.
  • the knife bodies 19 and 20 include the cutting edges 19a and 20a, respectively, and are formed of a ceramic material.
  • the knife body 20 is fixed to a shaft 21 and is held practically horizontally at a fixed position, whereas the knife body 19 is supported pivotally in a bearing 30 on the knife body 20 and is urged with a spring 31 so that the knife body 19 is pressed against the knife body 20.
  • the pressure of the spring 31 can be adjusted by a nut 32. It is desirable to mount the knife bodies 19 and 20 on the shaft 21 to make the cutting edges 19a and 20a longitudinally intersect each other so that a large shearing force is produced between the cutting edges 19a and 20a.
  • One end of a connecting rod 22 is connected pivotally to one end of the knife body 19, while the other end thereof is connected pivotally to one end of a lever 23.
  • the lever 23 is supported pivotally at the central part thereof with a shaft 24 and is urged with a spring 25 so that a roller 26 provided at the other end thereof is always in contact with a cam 27.
  • the cam 27 is fixed to the rocking shaft 28 of the loom and turns in synchronism with the rocking shaft 28. Accordingly, the rotation of the cam 27 causes the lever 23 to rock on the shaft 24 and thereby the knife body 19 is caused to reciprocate on the shaft 21 between a position shown by continuous lines and a position shown by broken lines through the up-and-down motion of the connecting rod 22.
  • the reciprocating motion of the knife body 19 causes the relative sliding motion of the cutting edge 19a of the knife body 19 and the cutting edge 20a of the knife body 20 as shown in Figures 3A and 3B to shear the weft yarn 4 with the cutting edges 19a and 20a.
  • the edge angles a and ⁇ of the cutting edges 19a and 20a of the knife bodies 19 and 20, respectively, in the respective cross sections are acute angles which are smaller than 90°, preferably 20° to 80°, more preferably 20° to 60°. Such acute edge angles a and ⁇ improve the weft yarn cutting effect of the yarn cutter. At least one of the edge angles a and ⁇ is required to be an acute angle which is smaller than 90°, however, the other edge angle may be an angle of 90°.
  • the preferable contact pressure between the cutting edges 19a and 20a is 0.3 kg to 0.5 kg.
  • the yarn cutter 17 of the present invention is to form at least one of the cutting edges of the ceramic material of claim 1. Therefore, the knife bodies 19 and 20 including the cutting edges 19a and 20a may be formed of a ceramic material as in the case of the embodiment as described hereinbefore or it is possible to form only the cutting edges 19a and 20a of a ceramic material and to form the rest part of the knife body of an ordinary metal as shown in Figure 5.
  • Figure 6 shows another embodiment of the present invention.
  • a yarn cutter 117 comprises a cylindrical ceramic body 120 and a cylindrical plunger 119 slidably fitted in the ceramic body 120.
  • a recess 121 is formed in the middle part of the body 120.
  • a cutting edge 120a is formed in the recess 121.
  • a cutting edge 119a is formed at one end of the plunger 119.
  • a weft yarn 4 is inserted in tensioning condition through the recess 121 and is sheared with the cutting edges 119a and 120a.
  • a corrosion resistant, wear resistant and tough yarn cutter which is free from rusting under a wet environment can be provided when at least the cutting edges of the yarn cutter are formed of a ceramic material as defined herein, namely a ceramic material consisting of a dispersion of zirconia containing cubic phase and zirconia containing tetragonal phase, the latter being present in a proportion of 5 to 70 mol%.
  • a ceramic material as defined herein, namely a ceramic material consisting of a dispersion of zirconia containing cubic phase and zirconia containing tetragonal phase, the latter being present in a proportion of 5 to 70 mol%.
  • zirconia ceramic may contain 70 mol % or less of monoclinic phase in addition to the cubic phase. Addition of the monoclinic phase improves further the mechanical strength of the material against thermal shock.
  • a composite sintered material of a ceramic and a metal namely a so called cermet, is applicable to the cutting edges of the yarn cutter of the present invention.
  • a cermet is produced by sintering a ceramic powder and a metal powder. Cermets have the toughness and the plasticity of metals in addition to corrosion resistance and wear resistance.
  • the yarn cutter of the present invention as described hereinbefore exhibits high cutting performance owing to the use of ceramic materials for the cutting edges and has extended life owing to the high corrosion resistance, high wear resistance, and increased toughness and hence, it improves the weaving efficiency of a shuttleless loom employing the yarn cutters of the present invention. Furthermore, since the yarn cutter of the present invention cuts wefts yarns only through the relative sliding motion of a pair of knife bodies, only an extremely small amount of energy is required for driving the yarn cutter and the power consumption of the yarn cutter is reduced practically to zero as compared with the conventional yarn cutter employing electric heaters.
  • the embodiments of the present invention have been described as applied to a water jet loom, the present invention is applicable also to other shuttleless looms such as a rapier loom and an air jet loom.
  • the use of the rotary motion of the rocking shaft is the most suitable means to drive the yarn cutter, however, the beating motion of the slay sword may be used for driving the yarn cutter.
  • Figure 7 shows a wear testing device for testing the wear of materials resulting from the frictional action of a wet yarn.
  • a yarn Y taken out from a cheese 61 is guided into a water tank 63 through a tenser 62 to be made to wet, then is made to pass around a test piece 63 through a contact angle of ⁇ and then is taken up by means of a take-up roller 64 and an aspirator 65.
  • the yarn Y used for the test is a polyester yarn of 18 filaments and 50 deniers (55 dTex) (a semi-dull polyester yarn containing titanium oxide).
  • A a martensite stainless steel (SAS-440C)
  • B a tungsten carbide sintered hard alloy
  • C a high speed steel (SKH9)
  • D a zirconia ceramic
  • E a carbide cermet.
  • the materials D and E are used for the yarn cutter of the present invention.
  • the respective power consumptions of a water jet loom equipped with a conventional electric heat yarn cutter and a water jet loom equipped with a shearing yarn cutter of the present invention were measured.
  • the materials of yarn cutters of the present invention subjected to the first comparative test and the second comparative test were a zirconia ceramic and a carbide cermet, respectively.
  • the test results are shown in Table 2.
  • the number of failures in cutting the weft yarn per 1,000,000 picks was 9 times and 4 times for the conventional electric heat yarn cutter and for the yarn cutter of the present invention, respectively.
  • the number of failures in cutting the weft yarn per 1,000,000 picks was 7 times and 2 times for the conventional electric heat yarn cutter and for the yarn cutter of the present invention, respectively.
  • a yarn cutter having paired knife bodies each being made of a zirconia-yttria ceramic was mounted on a water jet loom and was subjected to a test.
  • the amount of wear of the cutter after the cutting operation of 3,000,000 times was 0.0033 mm, which is equivalent to a limiting cutting frequency of three billion 400 million times.
  • the amount of wear of the cutter after the cutting operation of 3,000,000 times was 0.049 mm, which is equivalent to a limiting cutting frequency of approximately 50,000,000 times.
  • the amount of wear of the cutter when water is supplied positively to the cutter is reduced approximately to 67% of the amount of wear of the cutter when no water is supplied to the cutter and the limiting cutting frequency of the cutter when water is supplied positively to the cutter was increased approximately by 68 times that of the cutter when no water is supplied to the cutter.
  • the duration values found were, in terms of the number of months (24 hours a day, 30 days a month), 2.5 for the cutter F, 4 for the cutter G and 8 for the cutter H.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Claims (9)

1. Fadenabschneider (18) für einen schützenlosen Webstuhl, mit einem Paar von Messerkörpern (19, 20,119,120), deren jeder eine Schneidkante (19a, 20a; 119a, 120a) hat und für eine relative Gleitbewegung in gegenseitiger Berührung angetrieben ist, dadurch gekennzeichnet, daß mindestens die Schneidkante (19a, 20a, 119a, 120a) mindestens einer der Messerkörper aus einer Zirkoniumoxidkeramik hergestellt ist mit einer Dispersion einer Zirkoniumoxid enthaltenden kubischen Phase und einer Zirkoniumoxid enthaltenden tetragonalen Phase, wobei letztere in einem Verhältnis von zwischen 5 und 70 Mol-% vorhanden ist.
2. Fadenabschneider nach Anspruch 1, dadurch gekennzeichnet, daß mindestens einer der Messerkörper (19, 20; 119, 120) ganz aus einer Keramik hergestellt ist.
3. Fadenabschneider nach Anspruch 1, dadurch gekennzeichnet, daß einer der Messerkörper (19, 20; 119, 120) fest ist, während der andere beweglich ist.
4. Fadenabschneider nach Anspruch 1, dadurch gekennzeichnet, daß er ein Wasserzuführmittel (18) aufweist, welches in den Nachbarschaft der Schneidkanten (19a, 20a; 119a, 120a) der Messerkörper (19, 20; 119, 120) derart angeordnet ist, daß Wasser im Betrieb des Webstuhles zu den Körpern zugeführt wird.
5. Fadenabschneider nach Anspruch 1, dadurch gekennzeichnet, daß der Kantenwinkel der Schneidkanten (19a, 20a; 119a, 120a), im Querschnitt gesehen, ein Winkel von unter 90° ist.
6. Fadenabschneider nach Anspruch 1, dadurch gekennzeichnet, daß der Kantenwinkel der Schneidkanten (19a, 20a; 119a, 120a), im Querschnitt gesehen, ein Winkel von 20° bis 80° ist.
7. Fadenabschneider nach einem vorhergehenden Anspruch, dadurch gekennzeichnet, daß die Zirkoniumoxidkeramik bis zu 70 Mol-% monokliner Phase enthält.
8. Schützenloser Webstuhl mit Wasserstrahl, dadurch gekennzeichnet, daß er einen Fadenabschneider (17) nach einem der Ansprüche 1 bis 4 enthält.
9. Schützenloser Webstuhl nach Anspruch 8, dadurch gekennzeichnet, daß der Fadenabschneider (17) durch die Schweingwelle des Webstuhls angetrieben ist.
EP83300218A 1983-01-17 1983-01-17 Fadenabschneider für schützenlose Webstühle Expired EP0113942B2 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT83300218T ATE29533T1 (de) 1983-01-17 1983-01-17 Fadenabschneider fuer schuetzenlose webstuehle.
EP83300218A EP0113942B2 (de) 1983-01-17 1983-01-17 Fadenabschneider für schützenlose Webstühle
DE8383300218T DE3373503D1 (en) 1983-01-17 1983-01-17 Yarn cutter for shuttleless loom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83300218A EP0113942B2 (de) 1983-01-17 1983-01-17 Fadenabschneider für schützenlose Webstühle

Publications (3)

Publication Number Publication Date
EP0113942A1 EP0113942A1 (de) 1984-07-25
EP0113942B1 true EP0113942B1 (de) 1987-09-09
EP0113942B2 EP0113942B2 (de) 1991-01-23

Family

ID=8191030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83300218A Expired EP0113942B2 (de) 1983-01-17 1983-01-17 Fadenabschneider für schützenlose Webstühle

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EP (1) EP0113942B2 (de)
AT (1) ATE29533T1 (de)
DE (1) DE3373503D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0253934A1 (de) * 1986-07-25 1988-01-27 Toray Industries, Inc. Garnreiniger
IT1276941B1 (it) * 1995-10-16 1997-11-03 Somet Soc Mec Tessile Dispositivo di taglio trama per telai di tessitura
CN106048864B (zh) * 2016-08-09 2018-02-02 浙江和心控股集团有限公司 一种剑杆织机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES314730A1 (es) * 1965-06-28 1965-10-01 Ballbe Sabate Mariano Un aparato para cortar el hilo de trama en los telares
GB1344833A (en) * 1970-05-26 1974-01-23 Fothergill Harvey Ld Method for severing of weft yarn druing weaving

Also Published As

Publication number Publication date
EP0113942A1 (de) 1984-07-25
EP0113942B2 (de) 1991-01-23
ATE29533T1 (de) 1987-09-15
DE3373503D1 (en) 1987-10-15

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