US3809131A

US3809131A - Yarn carrier for a weaving machine

Info

Publication number: US3809131A
Application number: US00277549A
Authority: US
Inventors: H Kimura; H Arimoto; M Kitajima; H Nara; T Miyamatsu
Original assignee: Unitika Ltd
Current assignee: Unitika Ltd
Priority date: 1970-06-24
Filing date: 1972-08-03
Publication date: 1974-05-07
Anticipated expiration: 1991-05-07

Abstract

A yarn carrier for a weaving machine which has two arms including a yarn gripping portion which grips the yarn by means of contact between the two arms which are resiliently biased toward each other at the front of the yarn carrier in the flying direction. The yarn carrier also has a mechanism for releasing the depression of the two arms of the yarn gripping portion by a force applied from outside against the resiliency so as to freely pass the yarn through a gap made between the arms. Also, the yarn carrier has a guide groove formed in such a manner that width gradually decreases from the front to the rear of the feeding direction of the yarn carrier so as to feed the yarn to the yarn gripping portion and that the yarn gripping portion is formed in parallel with the flying direction of the yarn at the end portion at the inlet portion of the yarn to the yarn gripping portion of the yarn carrier.

Description

United States Patent 1191 Kimura et al.

[ YARN CARRIER FOR 'A WEAVING I MACHINE g [75] Inventors: Hiroshiro Kimura, Uji; Heiji Arimoto, Kyoto; Hirohisa Nara, Uji;

Tsugio Miyamatsu, Uji; Mitsuo v Kitajima, Uji, all of Japan [73] Assignee: Unitaka Ltd., Amagasaki-shi, Japan 22 Filed: Aug. 3, 1972 [21] Appl. No.: 277,549

, Related US. Application Data [62] Division of Ser. No. 49,476, June 24, 1970, Pat. No.

[52] U.S.- c1. 139/125 [51] 1m. (:1. D03] 5/06 58 Field of Search 139/122 R, 122 N, 125, 139/126, 196

[56] References Cited UNITED STATES PATENTS 2,738,810 ,3/1956 ,Varkonyi et al 139/126 3,695,306 10/1972 Kimura et a] 139/125 2,072,158 3/1937 Dewas 139/126 FOREIGN PATENTS OR APPLlCATlONS 1,488,508 6/1967 France l39/125 ,1111 3,809,131 1451 May7, 1974 Primary Examiner-Henry S. Jaudon Attorney, Agent, or Firmv -Sughruakothwell, Mion, Zinn & Macpeak 1 1571 ABSTRACT A yarn carrier for a weaving machine which has two arms including a yarn gripping portion which grips the yarn by means of contact between the two arms which are resiliently biased toward each other at the front of the yarn carrier in the flying direction. The yarn carrier also has a mechanism for releasing the depression of the two arms of theyarn gripping portion by a force applied from outside against the resiliency so as to freely pass the yarn through a gap made between the arms. Also, the yarn carrier has a guide groove formed in such a manner that width gradually decreases from the front to the rear of the feeding direction of the yarn carrier so as to feed the yarnto the yarn gripping portion and that the yarn gripping portion is formed in parallel with the flying direction of the yarn/at the end portion at the inlet portion of the yarn to the yarn gripping portion of the yarn carrier.

2 Claims, 13 Drawing Figures June 24, 1970 now US. Pat. No. 3,695,306.

I BACKGROUND or THE INVENTION 1. Field of the Invention This invention relates to a yarn carrier for a weaving machine, and more particularly to improvements of the yarn carrier used for a feeding of weft yarn to a weaving machine, and further to a yarn carrier which carries a weft yarn from one or more cheeses disposed at one or both sides of a weaving machine.

2. Description of the Prior Art One type of the conventional yarn carrier inserts. a shuttle opener between two flat springs disposed oppositely to open the flat springs, grips the yarn to feed the weft yarn, and stops the yarn carrier at a predetermined location at the other end so as to open the flat springs by the shuttle opener to remove the weft yarn..

Another of the conventional yarn carriers engages the weft yarn at the initial point of the feeding thereof It is a further object of the present invention to pro- I vide a yam'carrier which lays a weft yarn from one or more cheeses disposed at one or bothsides of the weaving machine onto warp yarns when a shuttle is opened. This is accomplished by means of the depression of two arms in pressure by the resiliency of the arms at the initial operating state of the flying yarn carrier without giving an excess tension to the yarn so as to positively interleave the yarn, to carry the weft yarn in the same.

state, to automatically release the engagement of the end of the'weft yarn upon reaching the other end of the weaving machine with a small space.

According to one aspect of the present invention, there is provided a yarn carrier for'a weaving machine whichcornprises twojarms including a yarn gripping portion which grips the yarn by means of the pressure on the two arms causedby the resiliency of the arms at the front of the yarn carrier with :respect to the flying and brakes the yarn by the yarn carrier itself at the same time feeding the yarn.

A still further type of the conventional yarn carrier has a small hole at the rear of the yarn carrier and the yarn passes through this small hole under the force of a device such as an air gun, flying theyarn carrier in a state that the end of the yarn isgripped by a gripper so that when the yarn carrier is disposed at a predetermined place the gripper of the end of the yarn is opened so that the yarn of hair pin state is braked so as to feed the weft yarn.

direction and a mechanism for releasing the depression of the two arms of the yarn gripping portion when the yarn carrier is urged from outside against the resiliency so as to pass freely the yarn through the gap made between the arms, and also having a yarn guide groove formed in such a manner that its width becomes gradually narrower from the front to the rear of the feeding direction of the yarn carrier and that the opening structure is formed in the same direction as the yarn gripping portion and that the yarn gripping portion is In still another embodiment the yarn carrier has a pair of right andleft hooks at one side thereof so that a when it flys by ,the yarn carrier having a blade atthe root of the hook, the weft yarn is stretched by a high tension from an ear to a cheese is engaged at the position of 2cm from the car so as to insert into the warp V yarn wherein the yarn is cut by the blade of the hook and shorter yarn is remained so as to grip the end of the yarn at the side of cheese.

The first and third of the aforementioned yarn carriers feed the yarn at steady state conditions, and accordingly it takes time to feed the yarn so thatit lowers the efficiency of the machine. The second and third carriers allow the yarn to fly by whilethey are broken by the yarn carrier itself so that the tension of the weft yarn becomes irregular and therefore a nappy state is introduced resulting occasionally in cutting the weft yarn or slacking it. Accordingly, using original yarn is restricted with the result that the latter carriers carriers are not preferable for a weaving machine. Further, the fourth yarn carrier grips and cuts the yarn at the same time, so that it imparts high tension to the yarn and reduces the gripping function. ofthe weft yarnso that this carrier is restricted to use only woolen yarn or thick span yarn and it is not proper for weaving fine span yarn or filament yarn.

SUMMARY OF THE INVENTION It is the object of the present invention to eliminate the aforementioned disadvantages of-the conventional yarn carriers and to provide a novel and improved yarn formed in parallel with the flying direction of the yarn at the end portion at the inlet portion of the yarn to the yarn gripping portion of the yarn carrier.

The otherobjccts, features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, in which:

B RIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a yarn carrier of the present invention;

FIG. 2 is a plan view of the inner structure of the carrier shown in FIG. 1;

FIGS. 3 and 4 are plan viewsof other embodiments of the yarn carrier of this invention;

. FIG. ,5 is a plan view of a further embodiment of the yarn carrier of this invention;

FIG. 6 is a plan view'of the yarn carrier of the inner structure thereof; I

FIG. "7 is a perspective view of a yarnstanding and grippingdevice used for the yarn carrier;

FIGS. 8a to 8d are explanatory views of the steps of yarn . vice in FIG. '7 to feed the weft yarn;

FIG. 9 is a perspective view of still another embodimentof the yarn carrier of this invention; and

FIG. 10 is a plan view of the inner structure of the yarn'carrier shown in FIG. 9.

DETAILEDDESCRIPTION OF THE INVENTION In the drawings, the like parts and components are designated by the same reference numerals.

Reference is now made to the drawings, particularly to FIGS. 1 through 4, which show one embodiment of the present invention.

The yarn carrier comprises

holder plates

1 and 2 which include guide groove or cutout 3 of V shape belngnarrower gradually from the front tothe rear direction with respect to the flying direction of the yarn carrier or to the yarn gripping portion. The

nip arms

4, 4', 4", 4" are rotatably held by the

holder plates

1 and 2, and fixed to either or both of the

holders

1 and 2, by the pins or screws 5', gauge plates, 7, 8 and 9 provide spacing between the

holder plates

1 and 2, and nip

arms

4, 4', 4", 4" and enable the

nip arms

4, 4, 4", 4" to be rotatable. The gauge plates are fixed to the

holder plates

1 and 2 by screws 17 and pins 18.

' The yarn carrier shown in FIG. 2 comprises a long bent groove 10 in the nip arm 4, and a short groove 11 in the fixed nip arm 5. A bent resilient member 6 fixedly disposed mostly in the long groove 10 and some in the short groove 11. The nip arm 4 is pivotally supported rotatably at the fulcrum A fixed to the

holder plates

1 and 2 so that the yarn gripping portion 4a is urged onto the yarn gripping portion 5a of the fixed nip arm 5,by the elasticity of the resilient member 6 and the

yarn gripping portions

4a and 5a pass through theend portion 3a of the yarn guide groove to be disposed on a line in parallel with the flying direction of the yarn carrier. Space is provided between the

arms

4 and 5 at the rear with respect to the flying direction of the yarn carrier of the nip arm so that if the rear end B of the nip arm 4 is urged against the elasticity of the resilient member 6, it may rotate around the fulcrum A to rethe other into the long groove 10 of the nip arm 4 so that the yarn gripping portion 4a of the nip arm 4 is 1 always urged into contact with the yarngripping portion 5a of the fixed nip arm 5. The engaging point at end 4b of the nip arm 4 and the gauge plate 9 acts as a fulcrum due to the tension of the resilient member 6. Accordingly, if the neighborhood of the rear end B of the nip arm 4 is depressed, it may rotate about point C of the yarn gripping portion 4a as a fulcrum and release the contact between the

yarn gripping portions

4a and 5a except the point C.

In the yarn carrier shown in FIG. 4, the nip arm 4" has a projection 12 and nip arm 4" has a groove 13 for engaging the projection 12. Pins 15 are fixed to the

holder plates

1 and 2, respectively within guide grooves 14 for the pins 15, and a pin 16 which is fixed to the

holder plates

1 and 2 at the rear engages an eye 16a of a resilient fork member 6 so that the rear portions of the

holder plates

1 and 2 are urged by both

legs

6b and 6c of the fork member 6' with the result that the yarn gripping portions 4a" and 4a are urged into contact with each other. If the rear ends B and B' of the nip arms 4" and 4" are urged in the neighborhood thereof, the arms are rotated at the projection 12 and the engaging groove 13 of the projection 12 as a fulcrum with each other so that the yarn gripping portions 4a" and. 4a are released from contact. In this case, the guide grooves 14 effect a guiding action for positively rotating the arms. Though in this embodiment the rear ends B" and B' of the nip arms 4" and 4" are projected from the

holder plates

1 and 2, they need not always be projected as long as they may be depressed from the outside.

The yarn carrier shown in FIGS. 1 through 4 may be ejected by means of a solenoid instantaneously magnetized by a pulse electric current or by a torsion spring whence the end of the yarn ejected previously across lease the contact of the yarn gripping portions 40 and the flying line ofthe yarn carrier (not shown) is guided by the guide groove 3 to the movable nip

arms

4, 4', 4" and 4", and the end of the fixed nip arm 5, is positively inserted between the

yarn gripping portions

4a and 5a or 4a and 5a and 4a" and 4a of the high speed flying yarn carrier and flys along with the yarn carrier to feed the weft yarn. When the yarn carrier. arrives at the other end, the weft yarn is released from engagement therewith since therear portions B, B", B and B' of the

nip arms

4, 4', 4" and 4" are urged by the fixed projection or pusher (not shown) thereby rotating the nip

arms

4, 4, 4", 4" against the tension of the resilient member 6 or 6'.

The yarn carrier shown in FIGS. 5 and 6 comprises nip

arms

54 and 54 which include

projection

54b and 54b, respectively projecting above the holder plates. Enough hollow portion 57 is provided to open or close the nip arms. The nip arms 54 and 54' open or close about the

fulcrums

55 and 55 as a center, and the

yarn gripping portions

54a and 54a of the, nip arms are de- I pressed by the plate springs 56 and 56'. Of course, any

member such as spring, rubber material may be used instead of the plate springs 56 and 56. r

FIG. 7 shows one embodiment of a yarn feeding device incorporated with the yarn carrier of this invention particularly used for a yarn easy to snap such as glass filament yarn. In FIG. 7, a pipe 71 comprises an inlet portion 72 which is wide enough to pass the yarn carrier without affecting its projections and a main portion 73 having narrower width which passes the yarn carrier but contacts the

projections

54b and 54b projecting from the

holder plates

1 and 2 and a proximity switch 75 is provided on the upper wall of the main portion 73.

The device also comprises a yarn collecting device 76 and a yarn gripping device 78 using a magnet to intermittently grip the yarn 79. The interaction of the yarn carrier and yarn supplying device is shown in FIGS. through 8d. FIG. 8a shows the state of the yarn carrier and yarn supplying device when the yarn carrier is stationary. The yarn gripping device 78 of the yarn supplying device is closed and the yarn 79 is held and straightened. The yarn carrier ejected by the absorbing force of the magnet (not shown) upon energization thereof by a pulsating current or action of a'spring (not shown), is introduced into the tube 71 (shown in FIG. 8b). As it approaches the switch 75 provided in the tube 71, this switch will operate to shut off the current of the magnet of the gripping device 78 through a control device separately provided (not shown) so as to open the gripping device; As shown in FIG. 8c at the next moment, the end of the yarn carrier passes through the switch 75 so that the projecting portions 7 54b and 54b from the holder plates of the nip arm of the yarn carrier areurged in contact with the main part 73 of the tube 71 with the result that the

gripping portions

54a and 54a' of the nip arm are opened against the force of the plate springs 56 and 56. The force required for the nip arm may adjust depending upon the change of the position of the fulcrum, but generally the supporting position may be better as near as possible to plate springs 56 and 56' of the yarn carrier are reset so that the nip

arms

54 and 54 positively grips the yarn 79. The yarn carrier then carries the warp yarns opened to the end of the weaving machine.

At the end of the weaving machine, the yarn carrier is introduced into the tube (not shown) with the same structure as the tube 71 and a magnet of a yarn gripping device (not shown) is energized by the operation of the switch provided in the tube soas to close the gripping device thus cutting off the yarn at a predetermined position in the neighborhood of the outlet of the yarn supplying tube 71. These operations are repeated so that quick and positive weaving operation may be done. As previously described, the tube 71 is used in the particular case, to actuate the yarn carrier, but it need not always be used.

In FIGS. 9 and10, the yarn carrier comprises

holder plates

91 and 92, and a slide plate 93 slidably held in 93 which pins are fixed

to'the holder plates

91 and 92.

within the long hole 93b. The nip arms 95 are formed 'round at the end and are mounted to freely rotate by the contact between the engaging grooves 930, and the projections 95a upon sliding of the slide plate 93 at the pins 951; as a fulcrum. The

holder plates

91 and 92 and slide plate 93 comprise guide groove 96 of V shape gradually narrowing from the front end to the rear end, respectively. The device also has a-spring holder plate 97 for fixing a pin 98 on which a resilient member such as spring 94 is mounted, a gauge plate 99 for spacing between the

holder plates

91 and 92, said gauge plate being fixed to the

holder plates

91 and 92 by the pins 99a and screw 910. The spring holder plate 97 is formed the same height as gauge plate 99 so as to allow the slide plate 93' to smoothly rotate the nip arms 95.

Screws

911 and 912 fixedly engage the

holder plates

91 and 92, and screws913 and 914 fix the

holder plates

91 and 92 and spring holder plate 97.

The yarn carrier thus constructed is ejected by the solenoidinstantaneously magnetized by the pulse current or by a torsion spring. The end of the yarn is straightened acrossthe flying line of the yarn carrier prior to the initiation of the flying of the yarn. The high speed initial flying of the yarn carrier causes the yarn to be positively gripped between the nip arms 95. When the yarn carrier arrives at the other end, the ends 93a of the slide plate 93 are depressed by a member such as wall of the yarn carrier receiving device (not shown) so that they are compressed to the end position of the

holder plates

1 and 2. If the'end 93a is not projected, a projection is provided" in the receiving device so that this may depressit inwardly at the end. Thus, the engaging grooves 93c of the sliding plate 93 lowers the engaging projection of the nip arms 95 against the resil iency of the resilient member such as spring 94 whereby the nip arms 95 rotate at the pins 95b as a fulcrum so that the gripped weft yarn is released from engagement.

ping portion is released.

In order to straighten the yarnbefore the yarn carrier of this invention grips the weft yarns, it is preferable to hold the yarn at a straightened state.

If the tension is large, in order to prevent the yarn from passing through the yarn gripping portion, the end of the groove provided in the holder plate may be in register with the yarn gripping portion.

In allthe embodiments described above the yarn carrier of this invention is compact, forexample, 50mm in length, 12mm in width and 6mm in thickness. Further, it is preferable that the surface of the yarn gripping portion of the nip arms be rough depending upon the type of the yarn, or have material of large friction. coefficient coated thereon or adhered thereonto.

In the above description of the present invention, the holder plate has been described as planar. It may, however, not always be planar, but may be any shape in section, such as, for example, having arcuate raised portion. Or, it may be cast or ground integrally with the gauge plate. However, if the section in the direction normal to the feeding direction is circular, the yarn carrier tends to rotate while it is flying so that this shape is not preferred. The end of the nip arm may preferably be circular so as not to deflect the yarn. In addition, though a groove has provided above on the holder plate, the end of the nip arm may be formed broadly to form a groove to the yarn gripping portion and the groove dispensed with.

The yarn straightening device may preferably be provided near the initial flying position.

- Though the nip arm is exemplified in contact with another resilient member, the nip arm itself is formed by a resilient member so that when any force is not applied from the outside, the yarn gripping portion is in contact therewith, but when the part of the nip arm is supplied with a depressing force from the outside, the force is imparted against the resilient force of the nip arm itself thereto with the result that the contact of the yarn grip- It should be understood from the foregoing description that the yarn carrier of this invention guides the weft yarn in the guide groove to the yarn gripping portion of the arms so as to positively grip it withoutjany mispick. In addition, the compact volume of the yarn carrier requires only a small force so asto accelerate the weaving.

It should be-also understood that according to the present invention the tension of the weft yarn is uniform so that the volume of the weaving machine may be saved.

We claim:

1. The yarn carrier for a weaving machine comprising:

spaced holder plates,

a yarn guide in the form of an inwardly tapering opening at the forward end of the spaced holder 7 plates relative to the sliding direction of the carrier,

said edge of said other arm defininga fixed fulcrum said one arm includes a groove at the rear, on the inner surface thereof facing said other arm, and

said other arm includes a corresponding groove at its forward end and extending beyond said fulcrum,

said other arm being of such length and configuration and said resilient means comprising a curved leaf spring of a length and curvature and having ends respectively disposed in said grooves such that the rear end of said other arm abutts said gauge plate and said gripping edges of respective arms are in resilient engagement with said other. arm being pivotable under applied force about said fulcrum to release a yarn grip therebetween.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 131 Dated May 7, 1974 lnventofls) Hiroshlro Klmura et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In The Headirig:

The claimed Priority Data was omitted. Should read:

--June 24,1969 Japan ..59,605/69-- Signed and sealed this 17th day of September 1974,,

(SEAL) Attest:

C. MARSHALL DANN MCCOY M. GIBSON JR.

Commissioner of Patents Attesting Officer FORM [JO-1050 Hones) USCOMM-DC 60376-P69 a U 5 GOVERNMENT PRNTINC UFFICEI I959 D365335.

Claims

1. The yarn carrier for a weaving machine comprising: spaced holder plates, a yarn guide in the form of an inwardly tapering opening at the forward end of the spaced holder plates relative to the sliding direction of the carrier, two relatively movable nip arms positioned between said plates and having opposed yarn gripping edges within said opening for grasping the yarn at the time the yarn begins to fly, the improvement wherein: one of said arms is fixed and the other of said arms has its yarn gripping edge in contact with the yarn gripping edge of said one arm with one point along said edge of said other arm defining a fixed fulcrum for the pivotable movement of said other arm about said one arm, and resilient means extending between said arms and maintaining pressing contact therebetween at said fulcrum but permitting rotation of said other arm about said fulcrum under applied force to said other arm to release said yarn.

2. The yarn carrier as claimed in claim 1 further comprising a gauge plate fixedly positioned between said holder of plates rearwardly of said arms, and wherein: said one arm includes a groove at the rear, on the inner surface thereof facing said other arm, and said other arm includes a corresponding groove at its forward end and extending beyond said fulcrum, said other arm being of such length and configuration and said resilient means comprising a curved leaf spring of a length and curvature and having ends respectively disposed in said grooves such that the rear end of said other arm abutts said gauge plate and said gripping edges of respective arms are in resilient engagement with said other arm being pivotable under applied force about said fulcrum to release a yarn grip therebetween.