US3346017A - Method and apparatus for resuming weaving - Google Patents

Method and apparatus for resuming weaving Download PDF

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Publication number
US3346017A
US3346017A US446265A US44626565A US3346017A US 3346017 A US3346017 A US 3346017A US 446265 A US446265 A US 446265A US 44626565 A US44626565 A US 44626565A US 3346017 A US3346017 A US 3346017A
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Prior art keywords
beat
fabric
line
warp
threads
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US446265A
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English (en)
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Fend Heinrich
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OC Oerlikon Corp AG Pfaeffikon
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Oerlikon Buehrle Holding AG
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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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/26—Travelling-wave-shed looms

Definitions

  • This angle is different in accordance with the compactness or density of the weft threads, the fabric width and the number of simultaneously working shuttles.
  • the beat-up line should the beat-up line always form a right angle with the direction of the warp then the weft threads are beaten at an angle to the warp threads which differs from 90, and the fabric must thereafter be somewhat stretched or deformed in order that the angle between the weft threads and warp threads becomes 90.
  • Another considerable object of this invention is concerned with an improved method of resuming weaving at a wave weaving loom such that no gaps appear in the fabric.
  • a further object of the invention is a method wherein when the loom is shut down the weft thread last inserted before the weft defect is brought into coincidence with the beat-up line, and that after starting up the loom and while the next weft thread is being inserted forming a spacing between said beat-up line and said weft thread last inserted such that each subsequently inserted weft thread is beaten up parallel to the previously inserted weft thread.
  • Another object of the invention is a method in accordance with the previous object wherein said spacing increases from the shuttle outlet side to the shuttle inlet side of the fabric.
  • the first of both of these measures can be advantageously employed when the beat-up line and the direction of travel of the shuttles is at right angles to the direction of the warp and the weft threads after beating form an angle with the direction of the warp which differs from and there should take place a mutual displacement of the warp threads between the beat-up line and the cloth beam in order that the weft threads, when the fabric travels onto the cloth beam, come to lie at right angles to the direction of the warp.
  • the second measure namely, displacing the forward movement reversal points of the beat-up members particularly comes into consideration if the weft threads are to be beaten such that they then directly extend at right angles to the warp threads. Then, namely, the angle between warp threads and beat-up line must be change.- able in accordance with the compactness or density of the weft and the shuttle spacing.
  • the beat-up members or elements can either move back and forth in planes disposed vertical to the beat-up line and forming a small angle with the plane of the warp threads.
  • Such an apparatus could also encompass the means and for guiding and displacing the shuttles, so that the direction of travel of the shuttles can also be changed with the direction of the beat-up line.
  • the individual beat-up or heating elements move to-and-fro upon ways or tracks which extend along planes parallel to the warp threads.
  • the beat-up line can be adjusted in that the range of stroke of the beat-up elements upon these tracks can be differently adjusted or displaced, perhaps in that the point of rotation where the beat-up elements are mounted are displaced through different paths parallel to the mentioned planes.
  • the inventive apparatus comprises a warp beam, means for building the sheds, means for inserting weft threads and beating of the weft threads, as well as a cloth beam.
  • such apparatus further incorporates means for bringing about relative displacement between the beatup line of the weft thread beating means and the warp threads passing therethrough, such relative displacement increasing from the shuttle exit side to the shuttle inlet side.
  • the means for bringing about the mentioned relative displacement could be such for variably lengthwise displacing the sections of the individual warp threads located in the region of the mentioned beat-up line, or could be such for displacing the one movement reversal points of the to-and-fro moving beat-up elements of the weft thread beating mechanism forming the beat-up line.
  • the beating mechanism if desired including the associated shuttle drive mechanism, could be pivotally mounted as a unit at one side of the weaving zone or field, or the range of stroke of the individual beating or beat-up elements can be variably displaceable along the paths or tracks of these beat-up elements.
  • FIGURE 1 is a perspective view from the left side of a first w-ave weaving loom equipped with an embodiment of the aforementioned apparatus;
  • FIGURE 2 schematically illustrates in plan view the condition of the warp and the fabric at a wave weaving loom according to FIGURE 1 after rupture of a warp thread and shutting down of the loom;
  • FIGURE 3 is a view analogous to FIGURE 2 of the condition of the warp and the fabric after the adjustment or displacement thereof directly prior to continuing weav- 111g;
  • FIGURES 4 "and 5 depict in an analogous representation the same elements in two different stages after beginning of the renewed weaving operation
  • FIGURE 6 is a perspective view from the right side of a wave weaving loom equipped with another embodiment of the mentioned apparatus
  • FIGURE 7 is a schematic side view of a wave weaving loom equipped with a third embodiment of inventive apparatus
  • FIGURE 8 is a schematic side View depicting details of the elements of the shuttle drive mechanism and beating mechanism of a wave weaving loom equipped with a fourth embodiment of inventive apparatus;
  • FIGURE 9 is a bottom view of a portion of the elements illustrated in FIGURE 8.
  • FIGURE 10 is a cross-sectional view of the device of FIGURE 9 taken along the line XX thereof;
  • FIGURE 11 schematically illustrates the mode of operation of the wave weaving loom equipped with the apparatus depicted in FIGURES 8-10, and viewed from the top along the line XI-XI of FIGURE 8.
  • reference numeral 10 designates the warp beam of the illustrated wave weaving loom and reference numeral 12 the cloth beam upon which is wound the fabric 13 produced by means of the warp 11. It will be understood that the warp 11 travels from the warp beam 10 over a tension beam 14, a first deflecting roller 15 and a guide roller 16 to a group of harnesses schematically indicated at 17, and from this location moves to the beat-up line or location 18.
  • harnesses of the harness group 17 for reasons of convenience in illustration have not been depicted in the drawing, yet any known harness construction suitable for the purposes of the invention can be employed.
  • These harnesses build from the warp 11, in that they alternately deflect their threads upwardly and downwardly, successive wave-shaped travelling sheds 19 which follow one another over the width of the fabric and are disposed between the warp threads 11a deflected upwardly and the warp threads 1111 which are deflected downwardly.
  • a plurality of sheds are simultaneously formed, each shed traversing the fabric in a wave-like manner.
  • each such travelling shed one of which is schematically illustrated in lengthwise section at the forward edge of the warp 11, there moves a shuttle 21.
  • the shuttles 21 are driven by members 22 which in the lengthwise direction of the loom, that is, along a respective plane extending vertical to the axes of the Warp beam 10 and the cloth beam 12, are individually moved back and forth in the same cycles with such a mutual phase displacement that they form in the direction of the arrow 23 transverse to the warp 11 and over the width of the fabric travelling bulges or loops of the same form and accommodated to the form of the shuttles 21, and in which these shuttles are held and entrained.
  • each of the members 22 temporarily acts as shuttle drive means 22a (FIGURE 2).
  • these same members 22 also function as beating or beat-up means 22b in that they beat-up a weft thread 24 which has been inserted in its shed 19 by the latter-most shuttle 21 moving past the relevant member 22 up to the beat-up line 18 at the already woven fabric 13.
  • the beat-up line 18 extends parallel to the axes of the warp beam 10 and the cloth beam 12.
  • each weft thread is then finally-depending upon the pattern of the fabric-tied into the resulting fabric 13 due to crossing of the warp threads 11a and 11b at the relevant location by means of the corresponding harnesses of the harness group 17.
  • the fabric 13 travels from the beat-up line 18 over a second guide roller 25, a second deflecting roller 26 and between an indexing and breast beam 27.
  • This indexing and breast beam 27 is driven in appropriate manner at an angular velocity which is adjustable by means of a handwheel 48 and ensures for a uniform feed movement of the fabric 13 throughout its entire width.
  • Fabric 13 moves from the breast beam 27 past a cont-act or pressure roller 28 onto the cloth beam 12 where it is wound-up.
  • the Warp 11 is continuously moved from the warp beam 10 to the beat-up line 18 and from this location moves as part of the fabric 13 to the cloth beam 12.
  • the tensioning beam 14, both of the guide rollers 16 and 25 and the breast beam 27 are mounted by shafts in both of the con fronting and spaced side walls 29 and 30 of the loom frame such as to be parallel and non-displaceable with respect to one another and to the respective shafts of the warp beam and the cloth beam 12.
  • the right wall 29, as viewed from the cloth beam 12 only two support shoulders or projections 29a and 29b are depicted, and from the left wall 30 portions have been removed in order to expose elements located behind such portions.
  • both of the deflecting rollers and 26 are pivotally mounted at their respective right end in the support shoulders 29a and 2%, respectively, of the right-hand side wall.
  • the respective left end of these deflecting rollers 26 are displaceably retained in arcshaped slots 31 and 32, respectively, of the left-hand side wall 30.
  • the lengthwise contour or profile of these slots 31 and 32 are selected such that the respective left ends of the deflecting rollers 15 and 26 can not only be displaced upwardly and downwardly rather also forwardly and rearwardly. Specifically, this displacement can be carried out in such a manner that the forces at these rollers 15, 26 and brought about by the tension of the warp 11 and the fabric 13 exhibit components which are as small as possible and extend parallel to the axis of the relevant roller. Consequently, there is counteracted against lateral deviation of the warp 11 and the fabric 13.
  • the deflecting roller 26 is mounted at such a height in the shoulder or projection 29b that it just cont-acts the plane of the fabric moving from the guide roller to the breast beam 27 when the axis of the deflecting roller 26 is situated in parallelism with the axes of the guide roller 25 and the breast beam 27. This happens when the deflecting roller 26 contacts against the upper end of the slot 32.
  • the left end of the deflecting roller 26 is moved downwardly, then the path of the warp 11 from the beatup line 18 to the breast beam 27 and the cloth beam 12 lengthens.
  • the individual warp threads 11 upon downward pivoting of the deflecting roller 26 are displaced forwardly in the region of the beat-up line 18 through different amounts which increase from the right to the left.
  • weft threads 24 of that portion of the fabric which bears upon the breast beam 27 or is wound onto the cloth beam 12 travel parallel to the axes of these beams and are situated at a right angle to the warp threads 11, then in the region of the beat-up line or fell 18 the weft thread 24 which was the last to be inserted into the fabric forms a small angle with the beat-up line 18 which is that much larger the further down the left end of the deflecting roller is located in the slot 32.
  • the deflecting roller 15 during downward pivoting of the deflecting roller 26 is upwardly pivoted about its support location in the support shoulder or projection 29a in such a manner that the path of each warp thread 11 from the tension beam 14 to the guide roller 15 is shortened exactly the same amount as the path of the same warp thread 11 is lengthened from the guide roller 25 to the breast beam 27.
  • the left end of the rear deflecting roller 15 in the slot 31 and the left end of the forward deflecting roller 26 in the'slot 32 are oppositely displaced by means of a common control lever 38 through the agency of a respective control link or rod 33 and 34 articulated to the aforesaid common lever 38 by means of a pin 35 and 36 respectively.
  • a tension spring 39 engages with the forward end 38a of the lever 38, the opposite end of this spring 39 being suspended at a bolt 40 seated in the wall 30. This tension spring 39 strives to rock the lever 38 counterclockwise, thus to lower the left end of the deflect ing roller 15 and to raise the left end of the deflecting roller 26.
  • the position of the common control lever 38 is determined by a second lever 41 through the intermediary of a control link or rod 42 coupling both aforesaid levers 38 and 41.
  • the lever 41 is mounted at a pin 43 which is seated at a regulating or adjusting slide member 45 horizontally displaceably guided upon two stationary pins 44 engaging in slot means 44a of slide member 45.
  • the pin 43 in turn engages with a lengthwise slot 46 of the lever 41.
  • the adjustment slide member 45 possesses a rack or toothed construction 47 at its forward end 47a with which engages a pinion 49.
  • This pinion 49 is operably connected for rotation with the handwheel 48 serving to regulate the angular velocity of the breast beam 27 and thereby the feed velocity of the warp threads 11 and the fabric 13. Assuming that the handwheel 48 is rotated in clockwise direction corresponding to an increase of the feed velocity, then the slide member 45 together with the pin 43 is displaced horizontally to the left.
  • the movement of the levers 38 and 41 and thus of both deflecting rollers 15 and 26 is controlled by means of a slide 50.
  • This slide 50 is articulated by means of a bolt 51 to the lever 41, is vertically displaceable in a stationary guide 52 arranged at the loom frame and engages by means of a pin 53 in a cam groove or slot 54 of a gear 55.
  • Gear 55 is freely rotatable upon a stub shaft 56 or the like mounted at the wall 30.
  • the slide member 50 can be locked in the region of its uppermost position by means of a pawl lever 57 carrying a pin 59 engaging beneath a nose 58 of the slide member 50.
  • the pawl 57 is pivotally mounted upon a pin 60 seated at the wall 30.
  • a spring 61 is suspended at one end at a bolt 62 seated at the wall 30 and engages at its other end by means of a bolt 63 with the pawl lever 57 to pull such towards the slide member 50.
  • Bolt member 63 also serves the purpose of rocking this slide member 50 by hand in order to release the pin 59 from engagement with the slider nose 58.
  • the gear 55 is drivable by means of a gear 64 maintained in rotation by the non-illustrated loom drive in the direction of the arrow 64a.
  • Gear 64 completes for each loom cycle one complete rotation, that is, rotates once during the time of passage of a shuttle at a considered location till the passage of the next shuttle at this location.
  • the transmission ratio from gear 64 to gear 55 corresponds to the reciprocal value of the number of shuttles 21 appearing across the fabric width. In the present exemplary situation where four shuttles successively follow one another across the width of the fabric such transmission ratio amounts to 1:4. It will also be observed that the gear 55 exhibits a smooth or non-toothed recess 65 in which can rotate the continuously revolving gear 64 without entraining gear 55.
  • this groove ascends in spiral-like manner contra the direction of rotation 55a of the gear 55, whereas it steeply descends from location 67 to location 66.
  • the warp threads are designated by reference character 11 and the Weft threads by reference character 14.
  • Numeral 17 schematically designates the harnesses serving for shed formation
  • reference numeral 22 designates the previously mentioned elements or members which act as shuttle drive means 22a for the shuttles 21 as well as beat-up means 22b effective behind each shuttle for the weft thread 24 emanating from the shuttles.
  • Reference character 18 represents the beat-up line, that is the line up to which the members 22 functioning as beat-up means 221) forwardly displace the inserted weft thread 24 in order to beat up such to the already woven fabric 13.
  • reference character 24a signifies a weft thread which has ruptured at location A and for which reason only half of it has been inserted in the fabric
  • reference character 242 denotes the previously last completely inserted weft thread.
  • the thread In order to remove the weaving error resulting from rupture of the weft thread 24a it is initially necessary to remove from the fabric all of the following threads 24b to 24h which have been inserted after and behind this ruptured weft thread 24a as well as the ruptured weft thread 24a itself, the right half of which is missing. Also the thread must be removed from the shuttles 21 which are located within the fabric width.
  • This fault could also not be corrected if the warp threads 11 are pulled back by rotating the warp beam 10, the breast beam 27 and the cloth beam 12 until the last already inserted weft thread 24z arrives at the location of the last-removed weft thread 24h. This is so because then this weft thread 24z and those weft threads inserted prior to it would come to rest in a mass increasing towards the right behind the beat-up line 18 and the beat-up means 22b effective along such line 18 could only compact the already produced fabric 13 such that the weft thread 24z pulled back to the location of the weft thread 24h at the beat-up line 18 and the previously inserted threads behind this beat-up line are pushed back.
  • the gap is of triangular form with a width which increases towards the right.
  • each warp thread located between the guide rollers 16 and 25 in the zone of which there is disposed the beat-up line 18 is thus rearwardly displaced through a path increasing from the right to the left. It will be appreciated that the increase of such displacement from the right to the left of the fabric edge is not exactly linear so that each weft thread follows a slight arc, however, the deviation from the straight line is unimportant.
  • the displacement is calculated such that by virtue of it the original inclined position of the weft threads 24 in the region of the beat-up line 18 is practically removed and the chord of the arc which these weft threads follow is now located at right angles to the warp threads 11.
  • the pin 53 Prior to releasing the slide member 50 the pin 53 is located in the steep portion of the cam groove or curve 54 of the gear 55 exactly beneath its position corresponding to the uppermost position of the slide member 50, since the gear 55 in this embodiment is not in engagement with the drive gear 64 on account of the recess 65.
  • the pivoting of the lever 41 brought about by the spring 39 and the downward movement of the slide member 50 due to the course of the cam groove or curve 54 causes rotation of the gear 55 in the direction of the arrow 55a until its teeth bounding the recess 65 come into engagement with the drive gear 64, which turns continuously during operation of the loom.
  • the gear 55 has executed a complete rotation and the drive gear 64 as many rotations as shuttles 21 follow one another across the fabric width. In the illustrated embodiment such would then be equal to four revolutions.
  • the levers 41 and 38 as well as the deflecting rollers 15 and 26 have been pivoted back into their starting position due to the gradual raising of the slide member 50 into its original locking position.
  • FIGURE 4 By inspecting FIGURE 4 there can be seen the position of this weft thread 241 which is in the process of being inserted and at the moment in' which the shuttle 21 delivering such thread has passed through somewhat more than the spacing between two'successively following shuttles and the already inserted weft threads up to and including the thread 242: have again received approximately more than a quarter of their original inclined position due to th different forward displacement of the warp threads 11. Consequently, at the left edge of the fabric and in front of the beat-up line 18 there is provided additional space for the just begun insertion of a further weft thread 24k.
  • FIGURE schematically illustrates the stage of the weaving operation in which the shuttles 21 inserting the Weft threads 24i' and 24k have moved further through a shuttle division and the already inserted weft threads have again assumed a further quarter of their original inclined position.
  • the introduction of a third weft thread 24l has already begun.
  • weft threads 241', 24k and 241 would be inserted approximately to such an extent as the weft threads 24e, 24 and 24g appearing in FIGURE 2, and the inclined position of the weft threads of the fabric would already correspond approximately to that shown in FIGURE 2.
  • the insertion of a fourth weft thread, which would be designated by reference character 24m, would have begun in the same manner as the thread 2411 of FIGURE 2.
  • the drive for the HP dexing and breast beam 27 as well as the cloth beam are switched-in and the loom continues to operate without any adjustment.
  • the breast beam is driven, for example, by an electrical connection (not shown) to the loom drive.
  • the adjustment of the regulating slide member 45 during rotation of the handwheel 48 for the purpose f changing the feed velocity of the fabric effects that the operation of the loom during the described work cycles i adjusted to the density of the weft threads changed in ac cordance with the feed.
  • the pin 43 at which the lever member 41 is mounted is arranged at such a height at the regulating slide member 45 that the slot 46 of the lever 41 is horizontally disposed at such time as the slide member 50 is located in its lowermost position, that is, its pin 53 engages at location 66 of the cam curve 54. If such is the case, then the left end of the deflecting roller 26 is located in its uppermost position, the axis of this roller is parallel to that of the breast beam 27, and the warp threads 11 and weft threads 24 are located in the position depicted in FIGURE 3.
  • This condition of the loom is independent of the feed velocity since in this case the horizontal displacement of the pin 43 during rotation of the handwheel 48 has no influence upon the likewise horizontal position of the lever 41.
  • the loom depicted in FIGURE 6 differs from that of FIGURE 1 insofar as the guide and deflecting rollers 15, 16, 25 and 26 ,are missing between the tension beam 70 and the beat-up line 18 as well as between the latter and the breast beam 71.
  • the axes of the warp beam 10, a guide roller 72 arranged between the latter and the tension beam 70, the controller or indexing roller 73 which in this case is different from the breast beam 71 and its contact or pressure roller 28 as well as the cloth beam 12 are parallel to one another.
  • the tension beam 70 is mounted at its left end in an upper shoulder or projection 30a of the only partially visible left side wall 30 of the loom, and at its right end is mounted in a support or carrier 74 extending over the entire length of the loom and mounted to be horizontally displaceable in lengthwise direction.
  • the breast beam 71 is mounted in an upper projection or shoulder 30b of the left side wall 30 as well as in the carrier or support 74.
  • Support 74 is displaceably guided upon two bolts or pins 75 which are mounted to the right side wall 29 of the loom frame which is only partially visible in FIGURE 6.
  • the tension beam 70 and the breast beam 71 are pivotal in a horizontal plane, however, remain parallel to one another.
  • the position of the support 74 is such that the axes of the tension beam 70 and the breast beam 71 are parallel to the beat-up line 18 and to the axes of the warp beam 10, the indexing roller 73 and the cloth beam 12. Since, during this operat ing condition, as explained with respect to FIGURES 1 and 2, the weft threads 24, of necessity, form a small angle on with the beat-up line 18, due to the parallelism of the beat-up line 18, the breast beam 71 and the cloth beam 12, the weft threads 24 of the fabric 13 wound onto the cloth beam 12 are not at right angles to the warp threads 11, rather build together with such an angle which deviates from a right angle by the amount a. Since 06 as a general rule only amounts to a small fraction of a radian, this deviation can be tolerated.
  • the displaceable support 74 possesses a recess 76 into which engages a pawl 78 pivotally mounted at a pin 77 at the side wall 29 at such time as the tension beam 70 and the breast beam 71 are located in parallelism to the warp beam and the cloth beam 12, as such is required by normal operation.
  • a tension spring 79 connected at one end to a bolt or pin 80 arranged at the pawl 78 and at the other end to a pin 81 mounted at the frame side wall 29 maintains the pawl 78 in engagement with the recess 76 of the support 74.
  • the pawl 78 can be manually released out of the aforementioned engagement contra the force of the spring 79.
  • a tension spring 83 engages further rearwardly at a bolt 82 seated at the support 74.
  • This tension spring 83 is suspended at a pin 84 of the frame wall 29 and strives to pull the support 74 forwards.
  • a control lever 87 is pivotally mounted by means of a pin 86 to the carrier or support 74 for displacement of the latter. It will be seen that this control lever 87 P sesses a lengthwise slot 88 by means of which it can be pivotally mounted upon a pin 89 which can be displaced in vertical direction.
  • a pin 90 is located at the lower end of the lever 87, engaging with a cam curve or groove 91 of a cam disk 93 connected with a gear 92.
  • the cam groove 91 exhibits a short radial section 94 the inner end of which is connected with the outer end via a spiral-shaped section 95 which gradually ascends in clockwise direction.
  • a cutout or notch 96 is formed at the circumference of the cam disk 93 in which, during the rotational position of the cam disk 93 where the pin 90 of the lever 87 is located in the radial section 94 of the cam groove 91, there engages a stop lever 98 pivotally mounted upon a pin 97 at the frame wall 29.
  • This stop lever 98 is under the action of a tension spring 99 suspended at a bolt 100 of the frame wall 29.
  • the cam disk 93 carries a pin 101 which, with the same rotational position of this disk, serves as a stop for a pawl 102.
  • Pawl 102 is articulated by means of a pin 103 to a lever 104.
  • Lever 104 is pivotally mounted upon a bolt 105 arranged at the frame wall 29.
  • the pawl 102 is pulled forwardly and pressed against the pin 101 by means of a spring 107 suspended at a bolt 106 mounted to the wall 29.
  • Reference character 108 represents a boss of the frame wall 29 by means of which the lever 104 is held in spaced relation from the surface of the wall 29.
  • the pawl 102 possesses a shoulder 109 at its rear portion by means of which it can engage with the pin 101.
  • the lever 104 is held in the position depicted in the drawing where the shoulder 109 is located further rearwardly than the pin 101 by means of an arm 110 extending forwardly from the control lever '87.
  • the gear 92 carrying the cam disk 93 is mounted to be freely rotatable upon a shaft or pin 111 arranged at the frame wall 29 and can be driven by means of a drive gear 112 which continuously revolves in clockwise direction during operation of the loom.
  • the gear 92 is driven in counterclockwise direction and with a speed of rotation ratio which corresponds to the reciprocal value of the number of shuttles 21 which are simultaneously moving with the fabric width.
  • the gear 92 and the cam disk 93 thus undertake one complete revolution during the time that a shuttle 21 passes across the full fabric width.
  • a handwheel 48 In order to displace the pin 89 upon which the control lever 87 is pivotable there is provided a handwheel 48, just as was the case for the displacement of the pin 43 of the first embodiment.
  • the handwheel 48 By means of the handwheel 48 it is possible to change the feed velocity of the warp threads 11 and the fabric 13 in relation to the speed of movement of the shuttles 21.
  • the so-called feed velocity is increased and at the same time an adjustment or regulating lever 45 guided upon two bolts 44 and which exhibits a toothed structure 47 meshing with a pinion 49 and carrying the pin 89, is downwardly displaced by means of the pinion 49 rigidly connected for rotation with the handwheel 48.
  • FIGURES 2 to 5 In order to explain the mode of operation of this embodiment of weaving loom, reference can again be made to FIGURES 2 to 5. It is only to be taken into consideration that during normal operation of the loom the tension beam 70 and the breast beam 71 are located parallel to the beat-up line 18 and the weft threads of the fabric 13 also during winding onto the cloth beam 12 still exhibit the same inclined position through the angle a as depicted in FIGURE 2.
  • a weft thread 24a during insertion becomes ruptured at the location A (FIGURE 2)
  • the pawl 78 is advantageously initially released manually by means of the bolt '80 from engagement with the recess 76 of the support or carrier 74.
  • the spring 83 then pulls the support 74 forwards, whereby the tension roller and the breast beam 71 pivot or rock forward about their support or bearing positions in the projections 30a and 30b respectively.
  • the warp threads 11 in the region of the beat-up line 18 are pulled forwardly through a path which increases from the left to the right and places the already completely or partially inserted weft threads from the breast beam 71 up to and including the weft thread 24h parallel to the beat-up line 18.
  • the displacement of the support 74 is thus limited to the path necessary for this parallel positioning with the momentary weft density so that the pin 90 at the lower end of the control lever 87, which is pivoted in counterclockwise direction by the support 74 by means of the pin 86 about the adjustable pin 89, reaches the inner end of the radial section 94 of the cam groove 91. Due to this forward pulling of the warp threads through a path which increases from the left to the right, there appears between the weft threads 24d to 24h which were the last to be inserted and at each location of the fabric width and the beat-up line 18 a spacing which increases from the left to the right.
  • the ruptured weft thread 24a and the subsequently inserted weft threads 24b to 24h are removed from the fabric, which in contrast to the first embodiment is possible in many cases on account of the mentioned spacing between the last web threads 24d to 24h without further uniform displacement of the warp threads 11 towards the front.
  • the thread is removed from all shuttles 21 located within the confines of the fabric width.
  • the last weft thread 242 located in paral- 13 lelism to the beat-up line 18 and which has remained in the fabric 13 is brought into coincidence with the beat-up line 18 by turning back the warp beam and the cloth beam 12, so that the condition depicted in FIGURE 3 is attained.
  • the loom is again placed into operation and the drive gear 112 begins to rotate in clockwise direction. Since the depression or recess 115 of the cam disk 114 associated therewith leaves the roller 116 the lever 104 is rocked in counterclockwise direction and the pawl 102 articulated thereto is displaced to the right. Due to engagement of its shoulder 109 with the pin 101 the cam disk 93 and the gear 92 connected therewith is rotated in counterclockwise direction, so that the toothing of this gear behind the recess 113 comes into engagement with the drive gear 112. This then takes over the drive of the gear 92 and the cam disk 93, by virtue of the rotation of which the stop lever 98 is pressed to the side.
  • the gear 92 then undertakes a complete revolution during such time as full shuttles 21 enter, one after the other, between the warp threads 11.
  • the pin 90 engaging in the ascending section or' portion 95 of the cam grove 91 is gradually pressed towards the left. Consequently, the control lever 87 rotates in clockwise direction about the pin 89 and displaces the support or carrier '74 towards the rear against the force ofthe spring 83, so that the axes of the tension beam 70 and the breast beam 71 are gradually pivoted back about their bearing supports in the frame projections 30a and 30b into their normal operating position parallel to the beat-up line 18 and to the axes of the warp beam 10 and the cloth beam 12.
  • reference numeral 10 again designates the warp beam, 11 the warp threads delivered from such beam, 17 the harness group for the formation of the sheds 19 with the upper warp threads 11a and lower warp threads 11b, numeral 18 the location of the beat-up line, 27 the breast beam, 73 the indexing roller, 28 the pressure or contact roller, and 12 the cloth beam onto which the fabric 13 is wound.
  • Reference character designates an apparatus for the variable lengthening of the path of the warp threads between the beat-up line 18 and the breast beam 27 which is parallel to the cloth beam 12.
  • This apparatus can, for example, encompass as with the loom of FIGURE 1, a guide roller 25 and a deflecting roller 26 pivotally mounted at its one end.
  • a guide roller 25 and a deflecting roller 26 pivotally mounted at its one end.
  • an adjustable breast beam such as provided for the loom of FIGURE 6.
  • the loom of the embodiment of FIGURE 7 possesses an apparatus for automatic compensation of warp thread tension.
  • This apparatus is arranged between the warp beam 10 and the harnesses 17 in place of the tension beam, and incorporates two guide rollers 121 and 1 22 which are mounted parallel to one another as well as to the warp beam 10. Additionally, such apparatus includes a dancer roller 123 which lies freely on the warp threads 11 between these guide rollers 121 and 122 and is only guided with both of its end stubs 124 in vertical ,slots 125 of the frame side walls.
  • the diameter of the dancer roller 123 substantially equals the inner spacing between the guide rollers 121 and 122, so that it is always trained over half its circumference by the warp threads 11, and thus the tension force which it exerts upon these warp threads is only dependent upon its weight, not however, upon its elevational position.
  • the dancer roller 123 thus holds the warp threads 11 and thereby the fabric 13 under constant tension.
  • warp threads 11 of this fabric 13 are held at the same length between the guide roller 122 and the breast beam 12 by means of the apparatus 120, then these warp threads also build loops of equal length between the guide rollers 121 and 122, and the axis of the dancer roller is disposed parallel to the axes of the guide rollers 121, 122.
  • the apparatus 120 can be controlled with the same mechanism and in the same manner as the corresponding apparatus controlled by the lever 38 and the support 74 at the forward end of the looms of FIGURE 1 and FIGURES 6 respectively.
  • the loom illustrated in FIGURE 6 and previously described possesses the disadvantage that the weft threads 24 in the manufactured fabric are not located exactly at right angles to the warp threads 11. In order to prevent this, it would be possible to ensure that in a loom according to FIGURE 1 or FIGURE 6 during normal weaving operation the beat-up line 18 does not extend at a right angle to the warp threads 11, rather extends forwardly at an inclination from the left to the right, forming with the axis of the breast beam an angle of the magnitude or previously defined with respect to FIGURE 2.
  • Such a loom could be realised in the manner that the means or mechanism for inserting and beating the weft threads and incorporating the shuttles 21, the members 22 and their guide means, control means and drive means, are pivotal as a unit with respect to the loom frame about an axis which is vertical to the axes of the warp beam 10 and the cloth beam 12.
  • beat-up means are not formed from the same elements as the shuttle drive means, as was the case with the beat-up means 22b of the previously described embodiments, rather such beat-up means are displacea-ble with respect to the shuttle drive means, and if means are provided which control the movement of these beat-up means in such a manner that their movement reversal points which form the fell or beat-up line 18 are disposed upon an at least approximately straight line which forms an adjustable angle with the direction of travel of the shuttles.
  • FIGURES 8 to 10 there is shown a drive mechanism for a shuttle drive means and a beat-up means 131 associated with it. Additionally, there is depicted a mechanism for controlling the movement of a row of such beat-up means which fulfills these requirements.
  • each shuttle drive means 130 takes place, for example, from a non-illustrated cam which with the corresponding drive cams for the other shuttle drive means of the loom are seated upon a common control shaft which continuously rotates during loom operation.
  • a rod 132 displaceable in a guide 133 provided at the loom frame is moved to-and-fro along a plane which is parallel to the warp threads 11 between a invariable forward terminal position 132a and an invariable rearward terminal position 13212.
  • a shuttle drive means 130 is seated upon each rod 132 which in the rear terminal position 132b of the rod between both of the planes in which neighboring warp threads 11 are deflected by the harnesses 17 upwardly, threads 11a, and downwardly, threads 11b, extends past that thread 11b of these warp threads which has just been deflected downwardly and into the shed 19 which has just travelled past.
  • the shuttle drive means 130 In the forward terminal position 132a of the rod 132 the shuttle drive means 130 is located completely outside of the shed 19, as indicated with phantom lines at 130a of FIGURE 8.
  • each shuttle drive means 130 there is formed a dovetail-shaped recess 134 and a support surface 135 parallel to the direction of displacement of the shuttle drive means for the temporarily passing-by shuttles 21.
  • the cycles of the to-and-fro movement of the individual rods 132 and the shuttle drive means 130 seated thereon are displaced in time towards one another in such a manner that the approximately vertical edges 134a bounding the recesses 134 at their rear form a sinus curve 136 (FIGURE 11), moving from the left to the right and continuing at right angles to the direction of movement of the rods 132.
  • reference character 136a designates the front extreme position and reference character 136b the rear extreme position of the mentioned edges 134a bounding the recesses 134, and with reference character a there is designated in FIG- URES 8 and 11, the stroke through which these edges move fore and aft, which stroke remains constant.
  • the rearwardly directed loops or bellies of this sinus curve 136 are disposed within the travelling sheds 19 formed from the warp threads by the harnesses 17.
  • Each shuttle 21 at its lower face or underside possesses a rib 137 which fits into the recesses 134 of a number of shuttle drive means 130, the rear boundaries of which are just situated at the top or apex portion of one of the mentioned rearwardly directed bellies of the sinus curve, so that the relevant shuttle due to the to-and-fro movement of the shuttle drive means 130 is forced to travel transversely across the fabric width with this sinus curve belly in the appropriate shed 19 at right angles to the direction of movement of the rods 132 whereby it inserts between the warp threads 11a and 11b the out-ofi weft thread 24 contained in such shuttle.
  • the shuttle 21 rests with a flat surface 138 disposed in front of the mentioned rib 137 upon the support surface 135 of the relevant shuttle drive means 130.
  • each rod 132 carries a pin 139 on which is pivotally mounted the corresponding beat-up means 131 constructed as a lever.
  • Each beat-up means 131 extends above this pin 139 along the same plane as the associated shuttle drive means 130 between neighboring warp threads 11 to such an extent towards the top that it extends past each of these warp threads 11 also in that position where they are most pronouncedly deflected upwardly, i.e. threads 11a.
  • Neighboring beat-up means 131 mutually brace themselves in lateral direction with the help of support shoes 149 provided at the upper end of the beat-up means 131.
  • These support shoes 146 incorporate parallel lateral slide surfaces of sufficient length, in order that these shoes 140 also then contact one another when the neighboring beatup means 131 provided with such shoes form with one another the largest angle which occurs during operation.
  • Each beat-up means 131 is pivotally retained with its bifurcated or forked lower end 141 upon a pin 142 seated at a slide member 143.
  • slide members 143 each third one engages by means of twopins 144, 145 in a slot or groove 146 of a stationary crossbeam 147 of the loom frame. This groove 146 extends parallel to the direction of movement of the drive rod 132. Since the slide means 143 laterally contact one another they are all guided in this manner parallel to the mentioned direction of movement.
  • the lower faces of the slide means 143 bear against an adjustment or regulating lever 148 which is pivotally mounted upon a vertical pin 149 at the left side of the loom at the crossbeam 147 and at its upper face exhibits a lengthwise groovelStl.
  • Each slide 143 carries a pin 144 which engages in this groove 150.
  • This last-mentioned pin for each third slide 143 is formed by the lower portion of the mentioned pin 144 and for the remaining slides is a special pin 151, as best ascertained by referring to FIGURE 10.
  • FIGURES 9 and 10 there are shown considerably fewer slides 143 than the loom actually exhibits in practice and are required by the beat-up means 131 of FIG- URE 11, each of which require such a slide 143.
  • the individual slides 143 are displaced parallel to one another through paths which are proportional to the spacing of the axes of their guide grooves 146 from the axis of the pin 149 and thus linearly increase from the left to the right side of the loom.
  • the lever 148 is pivoted rearwa-rdly from one position in which its lengthwise groove 150 extends at right angles to the guide grooves 146 into the position according to FIGURE 9, then each slide 143 comes to rest somewhat further to the rear than that neighboring it towardsthe pin 149, that is, towards the left side of the loom.
  • the pivot zones or regions 131a to 1311) of the individual beat-up means 131 displace to an increasing degree towards the front .from the left to the right side of the loom.
  • FIGURE 11 depicts the mode of operation of a wave weaving loom equipped with the apparatus according to FIGURES 8 to 10 with a position of the lever 148 which corresponds to normal operation of the loom.
  • the individual beat-up means 131 are schematically depicted in cross-section as taken along the plane XI-XI of FIGURE 8.
  • reference character 131k represents the corresponding line for the rear extreme position for such beat-up means 131.
  • reference character [1 denotes the path through which pass the forward edges of the beat-up means 131 between both mentioned extreme positions, measured in the plane XLXL
  • the beat-up means 131 move in the same manner as the shuttle drive means according to a travelling sinus line or curve.
  • the inclined position of the lever 148 to a degree which decreases from the left to the right
  • beating or beat-up means 131 are rear wardly displaced with respect to the shuttle drive means 130.
  • the line 131a which forms the geometric location of the forward extreme position of the forward edges of the beat-up means, is identical with the beat-up line 18.
  • each weft thread is beaten further rearwardly by a weft thread division than the weft thread introduced previous to such, so that all weft threads are beaten parallel to one another and perpendicular to the warp threads.
  • the loom is stopped and the lever 148 at the right side of the loom is pulled to the front until its lengthwise groove 150 is disposed at right angles to the direction of movement of the rods 132.
  • the lines 131a (beat-up line) and 1311) which define the extreme positions of the beatup means 131, as viewed from the top (FIGURE 11) are turned in counterclockwise direction and come to lie at right angles to the warp threads 11 and parallel to the weft threads 24 of the fabric 13, as indicated at 131a and 1311].
  • the loom including the feed of the fabric 13 and the warp can again be placed into operation, whereby care must be taken that the lever 148 during the time required for a shuttle 21 to pass through the entire fabric width is gradually again guided back into its normal operating position.
  • the right end of the beat-up line which is now turned back from 131a to 131a thus follows the feed of the fabric 13, whereas its left end remains at its location, so that by virtue of the feed of the warp threads, space is provided in front of the beatup line for the further beat-up weft threads.
  • a method for resuming weaving of a fabric on a wave weaving loom after interruption of weaving due to a weft defect the steps: while the loom is shut down bringing the weft thread last inserted before the weft defect into coincidence with a beat-up line; starting up the loom, and while the next weft thread is being inserted forming an angular spacing between said beat-up line and said weft thread last inserted such that each subsequently inserted weft thread is beaten up parallel to the previously inserted weft thread.
  • a method for resuming weaving of a fabric on a wave weaving loom after interruption of weaving due to a weft defect the steps: while the loom is shut down removing the weft threads inserted subsequent to the weft defect up to and including the weft defect; bringing the weft thread last inserted before the weft defect into coincidence with a beat-up line over the entire width of the fabric; starting up the loom, and while the next weft thread is being inserted forming a spacing between said beat-up line and said weft thread last inserted which increases from the shuttle outlet side of the fabric to the shuttle inlet side of the fabric, such that each Subsequently inserted weft thread is beaten up parallel to the previously inserted weft thread.
  • a member for resuming weaving of a fabric as claimed in claim 2 wherein the step of starting the loom initiates moving successive shuttles across the loom each for inserting a weft thread, and reciprocating each of a plurality of beating members up to said beat-up line and back therefrom for beating up the inserted weft threads, the step of forming said spacing between said beat-up line and said weft thread last inserted is effected during insertion of the next weft thread after starting the loom, by displacing the warp threads and the beat-up line relatively to each other by variable amounts increasing from the shuttle outlet side to the shuttle inlet side of the fabric, said method comprising the furher step of initiating uniform feeding of all warp threads after insertion of said next weft thread has been completed.
  • a method as claimed in claim 2 wherein the step of starting the loom initiates uniform feeding of all warp threads through the loom, moving successive shuttles across the loom each for inserting a weft thread, and reciprocating each of a plurality of beating members up to (said beat-up line and back therefrom for beating up the inserted weft threads, the step of forming said spacing between said beat-up line and said weft thread last inserted is effected during insertion of the next weft thread after starting the loom, by displacing the warp threads and the beat-up line relatively to each other, in the sense opposite to the displacement caused by the uniform feeding of the warp threads, by variable amounts increasing from the shuttle inlet side of the shuttle outlet side of the fabric.
  • An apparatus for resuming weaving of a fabric on a wave weaving 'loom after interruption of weaving due to a weft defect comprising, in combination. a warp beam for delivering warp threads, mechanism for simultaneously forming a plurality of sheds, means for inserting weft threads into said sheds, means for beating the inserted weft threads along a beat-up line, a cloth beam for receiving the woven fabric, and means bringing about a relative displacement between said beat-up line and the warp threads for bringing said beat-up line and the weft thread last inserted before the weft defect into coincidence.
  • An apparatus for resuming weaving of a fabric on a wave weaving loom after interruption of weaving due to a welt defect comprising, in combination, a warp beam for delivering warp threads, mechanism for simultaneously forming a plurality of sheds from said warp threads, means including shuttles for inserting weft threads into said sheds, means for beating the inserted weft threads along the beat-up line through which the warp threads pass, a cloth beam member for receiving a woven fabric, and means for bringing about a relative displacement for a desired period between said beat-up line and the warp threads passing through said beat-up line which displacement increases progressively from the outlet side of said shuttles to the inlet side thereof.
  • weft thread inserting means include shuttle drive elements, said shuttle drive elements and said beating means being constructed as individual components.
  • said relative displacement means comprises a device arranged at each side of said heating means for variably changing the length of the path of the individual warp threads and the portion of the fabric containing the warp threads at the relevant side of said heating means, means for operatiyely coupling said two devices with one another in such a manner that each change in length of the path of a warpthread brought about by one of said devices is opposite and at least approximately equal to the change in length of the path of the same warp thread at the opposite side of said beating means brought about by the other of said devices.
  • said relative displacement means comprise a first device arranged at one side of said beating means for variably changing the length of the path of the individual warp threads and the portion of the fabric containing such war-p threads at said one side of said beating means, and a second device arranged at the opposite side of said beat ing means for at least approximately maintaining constant the tension of the individual warp threads.
  • beating means comprises individual to-and-fro moving heating elements, the forward-most reversal movement points of which form said beat-up line, and means for displacing said forwardmost reversal movement points of said beating elements in such a manner that there is brought about an angular displacement of said beat-up line about a point located at the region of one edge of the weaving zone.
  • An apparatus as defined in claim 26 further including parallel track means upon which said individual beating elements can move to-and-fro, said dispacing means for said beating elements differently displacing the range of stroke of said beating elements along said track means.
  • weft thread inserting means includes shuttle drive elements, each of said individual heating elements being movably connected with a shuttle drive element displaceable toand-fro in a constant range of stroke, each beating element being driven by its shuttle drive element.
  • said displacing means for said beatin-g elements further including a respective pin member upon which each heating element is mount-ed to rock back and forth, said pin member being guided parallel to the plane of pivoting of its associated beating element, and lever means mounted at one side f the weaving zone common to all heating elements for displacing said pin members.
  • An apparatus as defined in claim 31 further including an indexing mechanism for effecting uniform feed of all of the warp threads, said control means incorporating an adjusting mechanism for maintaining the speed with which said relative displacement is annihilated by said control means proportional to the speed of the uniform feed of all of the warp threads effected by said indexing mechanism.
  • control means incorporates a further adjusting mechanism for regulating the relationship of the speed with which said relative displacement is annihilated to the speed of operation of said weft thread inserting means and said beating means, said further adjusting mechanism being adapted to be operatively coupled with an adjusting mechanism which controls the relationship of the speed of uni form feed of all of the warp threads effected by an indexing mechanism to the speed of operation of the weft thread inserting means and the beating means.

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  • Textile Engineering (AREA)
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US446265A 1964-04-14 1965-04-07 Method and apparatus for resuming weaving Expired - Lifetime US3346017A (en)

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CH480564A CH416489A (de) 1964-04-14 1964-04-14 Verfahren zum Weiterweben eines auf einer Wellenwebmaschine in Herstellung begriffenen Gewebestückes nach einer Arbeitsunterbrechung, und Einrichtung an Wellenwebmaschine zur Durchführung des Verfahrens

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AT (1) AT269761B (de)
BE (1) BE662504A (de)
CH (1) CH416489A (de)
DE (1) DE1535562B1 (de)
ES (1) ES312200A1 (de)
GB (1) GB1108735A (de)
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US3498336A (en) * 1967-06-27 1970-03-03 Oerlikon Buehrle Ag Device for resuming weaving on a wave weaving loom
US20090218001A1 (en) * 2006-09-13 2009-09-03 Picanol N.V. Fabric support for a weaving machine

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CS148467B1 (de) * 1970-04-28 1973-02-22

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US1316159A (en) * 1919-09-16 Plahooftaph co
US2587009A (en) * 1947-10-17 1952-02-26 Celanese Corp Reciprocating reed for loom lay
US2845093A (en) * 1952-07-22 1958-07-29 Schiesser Ag Trikotfabriken Method of and means for weaving
US2884015A (en) * 1953-10-22 1959-04-28 Bechter Hermann Tensioning roller for weaving looms
US3165125A (en) * 1963-04-15 1965-01-12 Draper Corp Fabric control mechanism to prevent starting marks
US3173455A (en) * 1963-02-04 1965-03-16 Draper Corp Method of preventing starting marks in weaving

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BE635289A (de) *
US2311674A (en) * 1940-09-05 1943-02-23 Barber Colman Co Apparatus for and method of detecting and correcting for skew in woven material
US2343328A (en) * 1940-12-14 1944-03-07 Robertson Co H H Weft straightening method and apparatus
DE958734C (de) * 1953-12-02 1957-02-21 John Douglas Robertson Auf Zugspannung ansprechende Regelvorrichtung fuer Breitspanner u. dgl.

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US1316159A (en) * 1919-09-16 Plahooftaph co
US2587009A (en) * 1947-10-17 1952-02-26 Celanese Corp Reciprocating reed for loom lay
US2845093A (en) * 1952-07-22 1958-07-29 Schiesser Ag Trikotfabriken Method of and means for weaving
US2884015A (en) * 1953-10-22 1959-04-28 Bechter Hermann Tensioning roller for weaving looms
US3173455A (en) * 1963-02-04 1965-03-16 Draper Corp Method of preventing starting marks in weaving
US3165125A (en) * 1963-04-15 1965-01-12 Draper Corp Fabric control mechanism to prevent starting marks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498336A (en) * 1967-06-27 1970-03-03 Oerlikon Buehrle Ag Device for resuming weaving on a wave weaving loom
US20090218001A1 (en) * 2006-09-13 2009-09-03 Picanol N.V. Fabric support for a weaving machine
US7770605B2 (en) * 2006-09-13 2010-08-10 Picanol N.V. Fabric support for a weaving machine

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ES312200A1 (es) 1966-01-01
CH416489A (de) 1966-06-30
NL6504142A (de) 1965-10-15
SE317331B (de) 1969-11-10
GB1108735A (en) 1968-04-03
AT269761B (de) 1969-04-10
BE662504A (de) 1965-08-02
DE1535562B1 (de) 1970-04-09

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