US3908709A - Weft picking apparatus - Google Patents

Weft picking apparatus Download PDF

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Publication number
US3908709A
US3908709A US147475A US14747571A US3908709A US 3908709 A US3908709 A US 3908709A US 147475 A US147475 A US 147475A US 14747571 A US14747571 A US 14747571A US 3908709 A US3908709 A US 3908709A
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US
United States
Prior art keywords
weft yarn
weft
pick roller
ramp
supporting
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 - Lifetime
Application number
US147475A
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English (en)
Inventor
Albert E Moessinger
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.)
Moessinger SA
Original Assignee
Moessinger SA
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Filing date
Publication date
Priority claimed from CH782970A external-priority patent/CH532670A/fr
Application filed by Moessinger SA filed Critical Moessinger SA
Application granted granted Critical
Publication of US3908709A publication Critical patent/US3908709A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • D03D47/368—Air chamber storage devices

Definitions

  • oscillation of the picking lever rotates the drive roller element to drive the pick roller at a peripheral speed 139/122 R, 127 R 145 eqnal to or greater than the speed of the weft yarn passing therearound.
  • the present invention pertains to weftpickingapparatus for shuttleless looms and, more particularly, to,
  • the movement of a light andfl'exible yarn, such as is used in weaving, is essentially different from the movement of the cord of a whip in thatthe whip cord has a certain stiffness, at least over the first few centimeters close to the rod, and in a whip this stiffness holds the cord away from the point of attachment and prevents the cord from rubbing against the rod whereas such is not the case with the fine and flexible yarns used in weaving.
  • the yarn must be guided in a manner to insure that the movement of the yarn follows a very spe'cificdirectional path during acceleration by the picker stick.
  • the point of fixation of the yarn must be eccentric with respect to thepath of movement.
  • the shape of the loop' of weft yarn traveling through the shed is determined by the movement of the picker stick during acceleration of the yarn, and the two branches or sides of the loop ofweft yarn' must be maintained sufficiently separated.
  • the weft yarn is passed over a pick shaft or roller (small wheel) placed at the extremity of the picking lever; however, since the acceleration of the yarn is very great at the shoot, the pressure of the yarn around the pick roller is not sufficient to accelerate the pick roller, thereby resulting in slippage between the yarn and thepick roller to increase the tension, which is already high, at the'held end of the yarn loop. In order to prevent friction of the yarn slipping around the pick roller, it has been proof the yarn passing over the pick roller.
  • weftpicking appai for a shuttleless'loohi including 5 means for retaining, a weft yarn supplied from a position external of a shed-forming area, a feeding assembly for delivering the weft yarn from the supply to the retaining means, a pick roller for catching the weft yarn between the supply and the retainingmea'ns, a support for the pick roller permitting rotation thereof and mov- 1 able to oscillate the pick roller to impart an acceleration to the weft yarn to project the .weft yarn in a loop.
  • drive means including a ramp havingla configuration of a segment of a circle having.
  • Another object of the present invention is to connect a drive roller element with a pick roller and to move the drive roller element overa ramp as a picking lever is oscillated in order to provide the pick roller with a pe- V .ripheral speed at least equal to the speed of the weft yarn passing therearound.
  • the present invention has another object in that a band having a fixed end and another end attached to a spring is utilized to rotate a drive roller element connected with a pick roller in response to oscillation of a picking lever in order to provide the pick roller with a. peripheral speed at least equal to the speed of the weft yarn passing therearound.
  • a further object of the present invention i's t'o decrease friction between a pick roller and a weft yarn during shooting or projecting of a loop ofthe weft yarn through a shed.
  • FIGS. 1 and 2 are front and side elevations partially I insections of the weft picking apparatus according to the present invention.
  • FIG. 3 is a front elevation of the support and drive assembly of FIG. 1."
  • FIG. 4 is a cross section of the weft picking head of FIG 5 is a side elevation of the support and drive assembly of FIG. 3.
  • FIG. 6 is a front elevation of another embodiment of the support and drive assembly of the weft picking'ap- F1627 is across sectionof the weftpicking head of FIG. 6.
  • FIG. 8 is a side elevation of the support and drive assembly of FlG. 6 i 1
  • FIG. 9 is a side elevation of a further embodiment: of a support and drive assembly for usewith the weft pick ing apparatus of the present invention.
  • FIG. 10 is a cross section of the weft picking head of FIG. 9.
  • the apparatus of the present invention includes a sley l which is connected with a main drive shaft by a system of connecting rods and handles (not shown), and as sley 1 is ocsillated, a connecting rod 2, which is connected to the sley, is moved to control a rocking lever 3 which turns freely on a pick shaft 4.
  • 'Rocking lever 3 has adjustment screws 5 and 6 associated therewith, and pick shaft 4, which rotates in bearings 7 and 8, has a multiple extending lever 9 which carriers an abutment or stop 10 and hinged axles 11 and 12.
  • a twist bar 14, of square section at each extremity, has an extremity 13 fitted in a mating housing of pick shaft 4 and held tightly by means of a split ring 15.
  • the other extremity 16 of twist bar 14 extends through and engages a tube 17 rigidly secured to a support box 18 and by means of a strap 19 to a frame 101.
  • the attachment of tube 17 in the desired position permits adjustment of the desired picking force.
  • a picking lever 20 extends transversely from the longitudinal axis of pick shaft 4 and is secured thereto.
  • a clip is actuated to stop the yarn between spool 28 and guide 150, and a pick roller 29 drives the yarn 27 between yarn guides 150 and 151 forming a loop.
  • the head of the weft picking apparatus is illustrated in FIG. 4 and includes a housing 31 having an opening 32 for the passage of a ramp 33, and in the bottom of housing 31 is placed an abutment 34 and a leak-proof seal 35.
  • Ramp 33 has a configuration of a segment of a circle having a center coinciding with the rocking axis of lever 20, as shown in FIGS. 1 and 3.
  • An axle 36 is rigidly connected to housing 31 and carries a needle bearing bushing 37' freely in the housing, and pick rol- Two pairs of links 40 and 41 are affixed to housing 31 on one side by crimping and on the other side by a clip 42 and connect the head of the weft picking apparatus with axles 43 and 44 secured to the extremities of the picking lever 20 as illustrated in FIG. 3.
  • the force F (FIG. 1) ofthe stress pertaining to the mass caused by the acceleration of the weft picking apparatus is broken down into two separate forces: a force F which acts in the direction of links 41 for traction stress; and a force F perpendicular to the rolling surface of ramp 33 affixed on a support 46 which is secured to frame 101.
  • the force F is a function of an angle that is selected such that the product of force F and the modulus of friction of the drive roller element on ramp 33 is sufficient to rotatably drive, without sliding, the masses of roller 29 and needle bearing bushing 37 at a circumferential speed which must be at the minimum equal to that of the unwinding of weft yarn 27.
  • the engaging surfaces of bushing 37 and ramp 33 are preferably toothed in order to prevent slippage therebetween.
  • roller 29 is slightly larger than the diameter of the drive roller element formed by bushing 37 rolling on ramp 33, the circumferential speed of roller 29 will be higher than the speed of unwinding of yarn 27 and facilitates movement thereof.
  • Each link 40, 41 connecting the head of the weft picking apparatus in pairs to the picking lever 20 has a small aperture which permits a slight longitudinal movement, or lost motion with respect to axles 43 and 44 (FIG. 3), and links 40 and 41 alternately experience strain depending on whether the weft picking apparatus is in the acceleration phase or in the braking phase.
  • the weft picking apparatus After reaching the vertical position, the weft picking apparatus is slowed down while the loop of weft yarn 27 continues its trajectory by itself due to the energy accumulated in its mass during acceleration.
  • the braking of the weft picking apparatus in the example described, is effected by a hydraulic brake.
  • a connecting rod 47 (FlG. 1), connected to multiple lever 9 of pick shaft 4 by axle 11, has a spherical end 48 and carries a piston 49 sliding in a fixed body 50 on support box 18.
  • Body 50 has large apertures 51 therein to permit the circulation of a fluid 52, and an interchangeable jacket or liner 53, which is held by a detachable cap 54, is inserted within body 50.
  • Inside piston 49 a mating spherical crown 55 having a drainage hole 56 therein receives the spherical end 48 of connecting rod 47. Since the connection between the com necting rod 47 and piston 49 is provided with a certain axial clearance during the braking period, the pressure will force piston 49 against connecting rod 47 and the drainage hole will be closed. On the return-stroke, piston 49 is moved slightly from the end of connecting rod 47 due to the axial clearance and stress pertaining to the mass to thereby provide valve action.
  • FIGS. 6, 7 and 8 Another embodiment of weft picking apparatus according to the present invention is illustrated in FIGS. 6, 7 and 8 and includes a sliding block 57, perferably made of plastic material, which is guided on the sides 58 of a ramp 59 and encloses bearings 60 and 61 supporting a shouldered pin 62 which is integral with a drive roller element 63 and a pick wheel or roller 64.
  • Pin 62 is limited in longitudinal movement by means of a washer 65 and a cotter pin 66.
  • FIGS. 9 A further embodiment of the weft picking apparatus of the present invention is illustrated in FIGS. 9 and and includes a pick roller or wheel 75 having a groove 76 for receiving weft yarn 27 and a pulley having a groove 77 for receiving a driving band 78.
  • the roller is mounted on a needle bearing bushing 79 having a shouldered axle 80 affixed to the extremity of a picking lever 81 mounted on pick shaft 4.
  • the weft picking apparatus is accelerated, and it is slowed down or braked between II and III.
  • Needle bearing bushing 79 is limited in longitudinal movement by a washer 82 and a cotter pin 83.
  • lever 81 moves from left to right, and pick wheel 75 is rotatively driven by the jamming of the driving band 78 in groove 77. All of the forces of acceleration will be absorbed by the end affixed at 84 while the other end will be maintained under constant tension through the intermediary of spring 85.
  • the weft picking apparatus of the present invention may be utilized with any suitable shuttleless loom and yarn holding assemblies, such as that shown and described in US. Pat. No. 3,543,808, the specification of which is incorporated herein by references.
  • Weft picking apparatus for a shuttleless loom having a supply of weft yarn located outside of a shedforming area comprising:
  • feed means for delivering the weft yarn from the supply to said retaining means
  • pick roller means for catching the weft yarn between the supply and said retaining means
  • drive means including a ramp having a configuration of a segment of a circle having a center coinciding with said axis of said supporting means and a drive roller element carried by said supporting means and riding on said ramp, said drive roller element rotatably driving said pick roller means as said supporting means is moved and having a diameter equal to or less than the diameter of said pick roller means whereby the peripheral speed of said pick roller means is at least equal to the speed of the weft yarn passing around said pick roller means.
  • said supporting means includes a lever pivotally mounted at said axis and a connecting rod extending from said lever and carrying said drive roller element, said connecting rod being disposed at an angle with said ramp of greater than 10.
  • said supporting means includes a lever pivotally mounted at said axis having first and second legs extending on either side of said axis, first and second links each having one end supporting said drive roller element and a second end, and lost motion means inter-- connecting the free ends of said first and second legs of said lever and said second ends of said first and second links, respectively.
  • said supporting means includes a housing having an opening therein to permit said ramp to pass therethrough, and a needle bearing disposed within said housing and carrying said pick roller means.
  • Weft picking apparatus for a shuttleless loom having a supply of weft yarn located outside of a shedforming area comprising retaining means for the weft yarn;
  • feed means for delivering the weft yarn from the supply to said retaining means
  • pick roller means for catchingthe weft yarn between the supply and said retaining means
  • drive means including a pulley carried by said supporting means and rotatably driving said pick roller means, a band passing around said pulley having a first fixed end and a second end, and a spring having a fixed end and an opposite end attached to said second end of said band, said pulley being rotated as said supporting means is moved whereby the peripheral speed of said pick roller means is at least equal to the speed of the weft yarn passing around said pick roller means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US147475A 1970-05-27 1971-05-27 Weft picking apparatus Expired - Lifetime US3908709A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH782970A CH532670A (fr) 1967-02-13 1970-05-27 Mécanisme pour l'insertion d'un fil de trame dans la foule d'un métier à tisser

Publications (1)

Publication Number Publication Date
US3908709A true US3908709A (en) 1975-09-30

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US147475A Expired - Lifetime US3908709A (en) 1970-05-27 1971-05-27 Weft picking apparatus

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Country Link
US (1) US3908709A (enrdf_load_stackoverflow)
CS (1) CS177062B2 (enrdf_load_stackoverflow)
FR (1) FR2100696B2 (enrdf_load_stackoverflow)
GB (1) GB1337856A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3105141A1 (de) * 1980-02-15 1981-12-10 Société Alsacienne de Constructions Mécaniques de Mulhouse, 68054 Mulhouse, Haut-Rhin Verfahren und vorrichtung zum eintragen eines schussfadens in ein fach einer webmaschine
US20110081194A1 (en) * 2008-06-04 2011-04-07 Zf Friedrichshafen Ag Ball joint

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543808A (en) * 1968-02-13 1970-12-01 Albert E Moessinger Process and apparatus for the laying of a pick into the shed of a loom

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543808A (en) * 1968-02-13 1970-12-01 Albert E Moessinger Process and apparatus for the laying of a pick into the shed of a loom

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3105141A1 (de) * 1980-02-15 1981-12-10 Société Alsacienne de Constructions Mécaniques de Mulhouse, 68054 Mulhouse, Haut-Rhin Verfahren und vorrichtung zum eintragen eines schussfadens in ein fach einer webmaschine
US20110081194A1 (en) * 2008-06-04 2011-04-07 Zf Friedrichshafen Ag Ball joint
US8770882B2 (en) * 2008-06-04 2014-07-08 Zf Friedrichshafen Ag Ball joint

Also Published As

Publication number Publication date
FR2100696A2 (enrdf_load_stackoverflow) 1972-03-24
FR2100696B2 (enrdf_load_stackoverflow) 1974-03-22
DE2126102B2 (de) 1976-01-29
GB1337856A (en) 1973-11-21
CS177062B2 (enrdf_load_stackoverflow) 1977-07-29
DE2126102A1 (de) 1972-01-27

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