US3580292A - Apparatus and method for positioning warp sheds - Google Patents

Apparatus and method for positioning warp sheds Download PDF

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Publication number
US3580292A
US3580292A US829374A US3580292DA US3580292A US 3580292 A US3580292 A US 3580292A US 829374 A US829374 A US 829374A US 3580292D A US3580292D A US 3580292DA US 3580292 A US3580292 A US 3580292A
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United States
Prior art keywords
fabric
race
comb
warp shed
warp
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Expired - Lifetime
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US829374A
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English (en)
Inventor
Zdenek Rambousek
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.)
Elitex Zavody Textilniho
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Elitex Zavody Textilniho
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Publication date
Application filed by Elitex Zavody Textilniho filed Critical Elitex Zavody Textilniho
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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
    • D03D47/40—Forming selvedges
    • 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
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/20—Take-up motions; Cloth beams

Definitions

  • Striker ABSTRACT During weaving of a fabric and during reciprocation of a race comb for a gripper shuttle along a part-circular path with the slay, reciprocating guide means move a fabric portion with an open warp shed transversely to the path of the race comb so that the race comb is entered into the warp shed near the from position thereof, and is located substantially at the center of the warp shed when arriving at its rear position in which a gripper shuttle is picked through the race comb and warp shed.
  • gripper shuttles are picked through a race comb which includes a series of race elements which enter between the warp threads of a warp into the warp shed so that the gripper shuttle can be picked through the warp shed while being guided in the race comb across the warp shed.
  • the race comb is moved by the slay into the open warp shed before picking, and moves out of the warp shed due to the movement of the slay after the picking of the weft so that the newly inserted weft can be heat into the fell of the fabric by a reed mounted on the slay.
  • the duration of each pick depends to certain extent on the time required for the race comb to be moved by the slay into the warp shed to the position required for guiding the gripper shuttle in the warp shed across the same.
  • the guiding of the gripper shuttle during the pick by a race comb is preferable to the guiding of the shuttle by the warps forming the shed.
  • the race comb is secured to the slay or batten and moves abouta circular path whose center coincides with the shaft or pivot on which the slay is supported for angular rocking movement.
  • the race comb is mounted on the slay for independent movement, and when the slay is moved to its rear position, the race comb is moved in an additional motion into the shed, while during the movement of the slay with the reed to the front position, the race comb is independently withdrawn from the shed, moving relative to the slay before the reed on the slay beats the weft thread.
  • This improved system according to the prior art has the disadvantage that a complex construction is required for mounting the race comb on the slay, and for operating the race comb relative to the slay. Furthermore, the required independent oscillation of the race comb necessitates a rigid and strong construction of the race comb along the entire width of the loom which can be obtained only under great difficulties, and has the disadvantage of increasing the inertial mass which has to be moved.
  • Another object of the invention is to provide an arrangement in which by displacement of the warp shed, the race combis quickly placed at the center of he warp shed, so that sufficient time is available for the picking of the shuttle.
  • Another object of the invention is to move the warp shed relative to the circular path of the race comb so that the shed is withdrawn from the race comb a sufficient time before the beating operation so that the position of the warp threads is not disturbed in the finished fabric.
  • the apparatus of the invention positions warp sheds during the weaving of a fabric, and comprises a slay having a reedand a race comb, and being movable between a front position and a rear position while the race comb moves along a predetermined path; guide means for guiding the fabric forwardly of the fell of the fabric; and control means operating in timed relation with the slay for reciprocating the guide means with the fabric and with a warp shed, transversely to the plane of the fabric and toward and away from the path of the race comb.
  • the reed beats a weft thread into the fell of the fabric in the front position, and a shuttle is picked through the race comb in the rear position of the slay. Due to the displacement of the warp shed by the guide means relative to the path of the race comb, the race comb enters and leaves the warp shed a predetermined distance from the front position and from the fell of the fabric, so that the warps are not in a disturbed condition when the reed beats the weft thread. On the other hand, the displacement of the warp shed places the race comb substantially at the center of the warp shed when the slay has moved to the rear position so that the race comb can guide a picked shuttle across and through the warp shed.
  • the guide means forms a slot for guiding the fabric in a substantially horizontal working plane
  • the slay is mounted for angular rocking movement so that the reed and the race comb move along a substantially horizontal portion of a circle located under the working plane of the fabric.
  • the control means include a cam rotating in synchronism with the angular rocking movement of the slay, and cam follower means connected with the guide means for raising and lowering the same.
  • a method according to the present invention comprises the steps of reciprocating a race comb along a predetermined path between front and rear positions, and moving, during reciprocation of the race comb, the fabric with a warp shed transversely to the path from a first position in which a portion of he warp shed near the fell crosses the path so that the race comb is entered into the warp shed near the front position thereof, to a second position in which the race comb is located substantially at the center of the warp shed while being on the path near the rear position thereof whereby a shuttle can be picked along the race comb across the warp shed, and finally back to the first position so that a portion of the warp shed crosses the path again and the race comb is left outside of he warp shed spaced a predetermined distance from the front position thereof and from the fell of he fabric.
  • the position of the warp shed near the fell of the fabric is varied in accordance with a law determined by the cam controlling the guide means in order to obtain proper and desired positioning of the race comb in relation to the warp shed due to the combination of the motion of the race comb along the circular path with an up-and-down motion of the warp shed.
  • the timing is such that the warp shed is moved downward when the slay and the race comb move toward the rear, and upward when the slay and race comb move to a front position in which the reed beats up the weft so that the separation of the race comb from the warp shed is accelerated.
  • FIG. I is a fragmentary schematiccross-sectional view illustrating a portion of a loom provided with the apparatus of the invention
  • FIG. 2 is fragmentary schematic view illustrating the rela tive movements between the race comb and the warp shed.
  • FIGS. 3 to 7 are fragmentary schematic views illustrating successive operational positions of the apparatus of FIG. I during the displacement of a warp shed, and movement of the race comb along a circular path.
  • journals 2 support the arms 3 of a slay 4 for angular rocking movement on lateral walls 1, of which only one is shown.
  • the slay 4 carries a reed 5 and a race comb 6 which consists of a row of recessed elements 23, see FIG. 2, which form a race for a gripper shuttle 7 together with the reed 5.
  • the slay 4 is movable between a front position in which reed 5 beats the weft thread into the fell I3 of the fabric I2, and a rear position 5, see also FIG. 2, in which the shuttle is picked.
  • a pair of horizontal parallel guide bars I4 and 15 form between each other a gap through which fabric 12 passes to the breast beam 16 and over the same to winding rollers and to the cloth beam 17 on which the fabric 12 is wound up as new fabric is woven at the fell of the fabric by weft thread inserted into a warp shed formed by heddles of warp 8 and 9.
  • brackets and pivots 19 provided which respectively support carrier levers 18 on both sides of the fabric and loom.
  • At least one of carrier levers 18 support a cam follower roller 21 which is urged by a spring 22 acting on lever I8 into engagement with the peripheral cam track of a rotary cam which is driven in synchronism with the angular rocking movement ofslay 3, 4.
  • the fabric is guided in a conventional manner by stretching means, not shown.
  • FIG. 2 schematically illustrates the warp shed II as if it would not move so that during the angular movement of race comb 6 with slay 4, the upper end of the race comb 6 moves along an imaginary path 7a, and the center of the recessed portion 23 moves along an imaginary line 7b in relation to the warps 8 and 9.
  • FIG. 2 shows a distance b between the fell of the fabric 13 and a point of the imaginary path at which the upper end of comb 6 enters the warp shed II.
  • the distance b between the fell 13 of the fabric and a point of the path 7b of the center of the recessed portion 23 indicates the position which the depressed guide portions 23 ofthe race comb 6 assume at the center of the warp shed 11 between warps 8 and 9 for the picking of the shuttle. It will be understood that actually comb 6 moves along the circular path 24, and is placed in the desired positions relative to warp shed II only due to the downward movement of the warp shed by guide members 14 and 15.
  • FIGS. 3 to 7 the actual positions of thewarp shed l1, and of the warps 8 and 9 are shown in solid lines, while FIGS. 4 to 7 illustrate in broken lines 811 and 9a an invariable position of the warp shed in accordance with the prior art so that the displacement of the warp shed can be more clearly understood.
  • Warps 8 and 9 of shed II define the angle a
  • warps 8a and 9a define the angle a.
  • the initial basic position of the apparatus is assumed to be the position shown in FIGS. 1, 2 and 3 in which the reed beats the weft thread into the fell of the fabric 13.
  • control cam means 20 raise the guide means 18, I4 and 15 to the highest position while the heddles 10 fully open the warp shed the angle a.
  • the race comb 6 is located below fabric I2 in the left end position of slay 4.
  • the shuttle is located in the shuttle box at one side of the loom, not shown.
  • race comb 6 moves along the horizontal portion of a circular path 24 but at the same time, fabric 12, with warp shed ll begins to move downward due to the downward movement of guide bars 14 and 15, transverse to the path 24 and relative to the same and to race comb 6.
  • guide bars 14 and 15 have moved the fabric 12 with the warp shed ill a distance a down so that the fell of the fabric has moved to the position 13 downward, while comb 6 has moved in clockwise direction along path 24 to a position in which the upper edge 25 thereof has entered the warp shed ll.
  • the upper edge 25 sooner enters the warp shed and the guide elements 23 sooner pass between warp sheds of warp 9 than would be the case if the warp shed would remain in the position indicated by the broken lines 8a and 9a.
  • the upper ends 25 of the elements 23 of race comb 6 enter the warp shed a safe distance b, from the last weft thread at the fell 13 of the fabric so that the last weft thread cannot be caught and disturbed.
  • race comb 6 has continued its movement along the circular path 24, and the centers of the depressed portions of guide elements 23 which are located on the circular path 24, are also located at the center of the warp shed ll spaced the same distance from warps 8 and 9. If the warp shed had remained in the initial position indicated by broken lines 8a and 9a, the race of race comb 6 would not be located at the center of the warp shed equally spaced from warps 8a and 9a.
  • the race of the race comb 6 will be sooner in a position permitting the picking of the shuttle 7, as compared with the prior art construction in which the path 24 would not even be located at the center of the warp shed since the depressed guide portions 23 forming the race would not penetrate deeply enough into the warp shed 3a, remaining in its initial position.
  • the center of the depressed race portions 23 is located spaced the distance b from the fell of the fabric, as shown in FIG. 2.
  • the proper placing of the race comb 6 in the shuttle guiding central position in the warp shed requires a downward movement of the warp shed for the distance a As shown in FIG.
  • cam 20 has such a shape that downward movement of the fabric and warp shed is stopped while reed 5 is in its rear end position-Shuttle 7 has traversed the warp shed, and the warps 8 and 9 have been moved by the heddles 10 to an almost closed position defining the angle B.
  • the broken lines 8a and 90 define the angle [3, and show the position of the warp shed if the same had remained in its initial position shown in FIG. 2. It will be seen that the race of race comb 6 and the circular path 24 are still located in the smaller warp 11, which vwould not be the case if the warp shed had remained in its initial position 8a, 9a.
  • FIG. 7 shows race comb 6 and reed 5 during the return movement toward the front position, while cam has raised guide bars 14 and 15 to a position in which a fell of the fabric is located at 13' spaced again the distance a from the initial position 13 of the fell of the fabric.
  • the upper end of race comb 6 has just left the warp shed 11 passing between the warp threads of warp 8 a sufficient distance from the fell 13 so that the warp threads will not be disturbed when the reed 5 beats the inserted weft thread into the fell of the fabric.
  • the fabric is raised to its initial position shown in FIG. 3, and the warp shed 11 is closed and a new warp shed opened so that the above-described operations can be repeated.
  • the fabric 12 should be guided by the gap between guide bars 14 and 15 as closely as possible to the fell 13.
  • the downward movement of the guide bars 14 and 15 takes place due to the action of springs 22 acting on carrier levers l8 and urging cam follower roller 21 against the track of rotary cam 20.
  • FIG. 1 illustrates the preferred embodiment of the invention in which a rotary cam 20 is driven in synchronism with a rocking angular motion of slay means 3, 4, which is obtained by transmission means connecting the shaft of cam 20 and also the slay with a drive motor
  • cam fingers on the front side of the slay 4 on which cam follower rollers 21 roll during angular rocking movement of slay 4 with the cam fingers, not shown.
  • the guiding means for the fabric are combined with stretching means for the fabric, and in some cases it is also possible to provide only a lower guide bar 14, and to permit the fabric 12 to move down due to the action of gravity.
  • Apparatus for positioning warp sheds during the weaving of a fabric comprising, in combination, a slay having a reed and race comb, and being movable between a front position and a rear position while said race comb moves along a predetermined path, so that said reed beats a weft thread into the fell of the fabric in said front position, and so that a shuttle can be picked through said race comb in said rear position; heddle means for forming warp sheds at the fell of the fabric; guide means for guiding the fabric forwardly of the fell of the fabric and including first and second guide bars forming a gap for guiding the fabric and extending parallel to the fell of the fabric, carrier means at the ends of said guide bars including follower means, and supporting means mounting said carrier means for movement with said guide members transversely to the plane of the fabric; and control means including cam means operating in synchronism with said slay and controlling said follower means with said carrier means and guide bars so that the same reciprocate said fabric and a war
  • said supporting means include a breast beam over which the fabric is guided, two brackets mounted at the ends of said breast beam, and pivots on said brackets; said lever means including two levers mounted on said pivots, respectively.
  • Apparatus for positioning warp sheds during the weaving of a fabric comprising, in combination, a slay having a reed and a race comb, being movable between a front position and a rear position while said race comb moves along a predetermined path, said slay being mounted for angular rocking movement at one end thereof, and said reed.
  • said race comb being mounted on the other end of said slay so that said path is a substantially horizontal portion of a circle located under said working plane so that said reed beats a weft thread into fell of the fabric in said front position, and so that a shuttle can be picked through said race comb in said rear position; heddle means for forming warp sheds at the fell of the fabric; guide means for guiding the fabric forwardly of the fell of the fabric, said guide means forming a slot for guiding the fabric in a substantially horizontal plane; and control means including cam means for reciprocating said guide means with said fabric and said warp shed in substantially vertical direction in synchronism with the angular rocking movement of said slay for reciprocating said guide means with said fabric and with a warp shed, transversely to the plane of the fabric and toward and away from said path of said race comb so that due to the displacement of the warp shed relative to said path of said race comb, said race comb enters and leaves the warp shed a predetermined distance from said front position
  • the method of positioning a warp shed during the weaving of a fabric comprising opening a warp shed at the fell of the fabric; reciprocating a race comb along a predetermined path between front and rear positions; and moving, during reciprocation of said race comb, said warp shed transversely to said pathfrom a first position in which a portion of said warp shed near said fell crosses said path so that said race comb is entered intosaid warp shed near said front position thereof, to a second position in which said race comb is located substantially at the center of said warp shed while being on said path near said rear position whereby a shuttle can be picked along said race comb across said warp shed in said rear position, and finally back to said first position so that a portion of said warp shed crosses said path again and said

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US829374A 1968-06-03 1969-06-02 Apparatus and method for positioning warp sheds Expired - Lifetime US3580292A (en)

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CS406968 1968-06-03

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US3580292A true US3580292A (en) 1971-05-25

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US (1) US3580292A (nl)
BE (1) BE732681A (nl)
CH (1) CH492046A (nl)
FR (1) FR2010037A1 (nl)
GB (1) GB1225477A (nl)
NL (1) NL6908096A (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688808A (en) * 1970-12-15 1972-09-05 Nissan Motor Method of preventing a dent from being damaged by a weft yarn during beating and the device for accomplishing the same
FR2196410A1 (nl) * 1972-08-18 1974-03-15 Voest Ag
US4919171A (en) * 1988-04-07 1990-04-24 Lindauer Dornier Gesellschaft Mbh Air jet weaving loom with an expander having an extension

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631561A (en) * 1898-07-05 1899-08-22 Kunstweberei Claviez Company Ges Mit Beschraenkter Haftung Movable pile-guide for plush-looms.
FR738984A (fr) * 1931-06-24 1933-01-04 Dispositif de protège-peigne pour métier à tisser
US3424206A (en) * 1965-09-11 1969-01-28 Elitex Zavody Textilniho Shuttle and guiding structure therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631561A (en) * 1898-07-05 1899-08-22 Kunstweberei Claviez Company Ges Mit Beschraenkter Haftung Movable pile-guide for plush-looms.
FR738984A (fr) * 1931-06-24 1933-01-04 Dispositif de protège-peigne pour métier à tisser
US3424206A (en) * 1965-09-11 1969-01-28 Elitex Zavody Textilniho Shuttle and guiding structure therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688808A (en) * 1970-12-15 1972-09-05 Nissan Motor Method of preventing a dent from being damaged by a weft yarn during beating and the device for accomplishing the same
FR2196410A1 (nl) * 1972-08-18 1974-03-15 Voest Ag
US3856056A (en) * 1972-08-18 1974-12-24 Voest Alpine Montan Ag Battening apparatus in flat weaving machine
US4919171A (en) * 1988-04-07 1990-04-24 Lindauer Dornier Gesellschaft Mbh Air jet weaving loom with an expander having an extension

Also Published As

Publication number Publication date
NL6908096A (nl) 1969-12-05
DE1922396B2 (de) 1976-08-05
GB1225477A (nl) 1971-03-17
CH492046A (de) 1970-06-15
DE1922396A1 (de) 1969-12-04
BE732681A (nl) 1969-10-16
FR2010037A1 (nl) 1970-02-13

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