EP3022345B1 - Streichbaumvorrichtung für eine webmaschine - Google Patents

Streichbaumvorrichtung für eine webmaschine Download PDF

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Publication number
EP3022345B1
EP3022345B1 EP14739072.8A EP14739072A EP3022345B1 EP 3022345 B1 EP3022345 B1 EP 3022345B1 EP 14739072 A EP14739072 A EP 14739072A EP 3022345 B1 EP3022345 B1 EP 3022345B1
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EP
European Patent Office
Prior art keywords
guiding bar
back rest
guiding
longitudinal axis
bar
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EP14739072.8A
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English (en)
French (fr)
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EP3022345A2 (de
Inventor
Patrick Debergh
Ignace Meyns
Koenraad Vandecasteele
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Picanol NV
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Picanol NV
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Publication of EP3022345A2 publication Critical patent/EP3022345A2/de
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Publication of EP3022345B1 publication Critical patent/EP3022345B1/de
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    • 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
    • D03D49/22—Back rests; Lease rods; Brest beams

Definitions

  • the invention relates to a back rest device for guiding warp threads coming from a warp beam on a weaving machine, wherein the back rest device comprises a first guiding bar and a second guiding bar, which second guiding bar in use is arranged in parallel to the first guiding bar and upstream of the first guiding bar for deflecting warp threads coming from the warp beam.
  • the invention further relates to a weaving machine comprising a back rest device and a method for arranging a back rest device on a weaving machine.
  • a back rest device comprising a warp tensioning beam supported by one or more springs.
  • the device further comprises a carrier beam and a shaft, wherein the warp tensioning beam is rotatably supported by arms connected to the shaft.
  • an outer tube rotatably supported by the carrier beam and surrounding the carrier beam, and a rod connected to the outer tube by means of brackets and disposed between the warp tensioning beam and the outer tube are provided. Warp threads unwound from a warp beam run over the warp tensioning beam.
  • a portion of the warp threads runs directly from the warp tensioning beam to shed forming elements, whereas the remaining warp threads pass beneath the rod disposed between the outer tube and the warp tensioning beam. Depending on the angle of the outer tube supporting the rod, these warp threads are more or less tensioned.
  • DE 2103406 discloses to provide a sheet passed over the warp beam for applying a braking pressure.
  • FR 694.058 discloses a back rest device comprising a first guiding bar and a second guiding bar, which second guiding bar in use is arranged in parallel to the first guiding bar and upstream of the first guiding bar for deflecting warp threads coming from the warp beam, wherein in use the position of the second guiding bar with respect to the first guiding bar is not fixed and the second guiding bar is held in position by means of a counterweight.
  • US 1,573,777 discloses a back rest device comprising a first guiding bar and a second guiding bar, which second guiding bar in use is arranged fixed in position in parallel to the first guiding bar and upstream of the first guiding bar for deflecting warp threads coming from the warp beam.
  • guiding bars of different sizes can be combined.
  • a back rest device for guiding warp threads coming from a warp beam, comprising a first guiding bar, a second guiding bar, which second guiding bar in use is arranged in parallel to the first guiding bar and upstream of the first guiding bar for deflecting warp threads coming from the warp beam, a mounting device, which mounting device is arranged for mounting the first guiding bar in a fixed mounting position and in a non-rotatable manner, and a supporting device, which supporting device is arranged for supporting the second guiding bar so that in use the longitudinal axis of the second guiding bar is fixed in position with respect to the longitudinal axis of the first guiding bar, wherein the second guiding bar is mounted on the first guiding bar by means of the supporting device, and wherein the position of the longitudinal axis of the second guiding bar with respect to the longitudinal axis of the first guiding bar is settable, wherein in order to bring the longitudinal axis of the second guiding bar into a set position with
  • the second guiding bar is supported so that in use its longitudinal axis is fixed in position with respect to the first guiding bar.
  • the second guiding bar is mounted fixed in position with respect to the first guiding bar in a plane perpendicular to the longitudinal axis of the second guiding bar.
  • the second guiding bar in one embodiment is moveable with respect to the first guiding bar in the direction of its longitudinal axis.
  • the back rest device according to the invention is in particular suitable for weaving a heavy fabric.
  • a fabric having a cover factor in the order of magnitude of forty is defined as a heavy fabric.
  • the cover factor is the ratio of the area of the fabric covered by the threads to the whole area of the fabric, in other words the cover factor as expressed by the known basic model of Pierce.
  • a first guiding bar having a sufficient rigidity is provided. Rigid elements made for example of stainless steel, tend to have a higher weight than less rigid elements. As the first guiding bar is mounted in a fixed mounting position, a higher weight is acceptable.
  • a tension is applied to the warp threads guided along the surface of the first guiding bar.
  • the tension depends among others on a wrap angle.
  • the wrap angle is defined as the contact angle of the warp threads against the first guiding bar.
  • a diameter of a warp beam and, hence, a withdrawal angle of the warp threads from the warp beam is varying over time due to warp thread consumption.
  • the warp threads are supplied to the first guiding bar from a fixed position and with a fixed direction. Therefore, with the assumption that the withdrawal angle of warp threads leaving the first guiding bar is at least substantially constant, the warp threads are wrapped around the first guiding bar with a fixed wrap angle.
  • the second guiding bar will also tension the warp threads.
  • the second guiding bar is arranged substantially fixed in position in a plane perpendicular to its longitudinal axis, a wrap angle of the warp threads coming from the warp beam and deflected by the second guiding bar varies over time due to warp thread consumption.
  • the second guiding bar is arranged so that the tension applied due to frictional effects is significantly less than the tension applied by the first guiding bar.
  • the second guiding bar is arranged rotatable and/or a supporting surface of the second guiding bar is chosen smaller in size. As a result, the variance of the wrap angle around the second guiding bar has no or at least no relevant influence on the tension applied.
  • the first guiding bar is mounted in a fixed mounting position, wherein in one embodiment, the fixed mounting position is settable for example by means of a support table.
  • the tension depends among others on the wrap angle against the first guiding bar.
  • the position of the longitudinal axis of the second guiding bar with respect to the longitudinal axis of the first bar defines the wrap angle of the warp threads against the first guiding bar.
  • a wrap angle is chosen for applying a defined tension.
  • the second guiding bar is provided in a position for allowing a wrap angle of the warp threads against the first guiding bar between approximately 120 degrees and approximately 290 degrees.
  • a relative positioning of the second guiding bar and the first guiding bar is independent from the absolute mounting position of the first guiding bar.
  • the second guiding bar in one embodiment is mounted on the first guiding bar by two support elements provided at the two ends of the second guiding bar.
  • the supporting device comprises a plurality of support elements distributedly arranged over the length of the first guiding bar for supporting the second guiding bar.
  • plate-like elements arranged perpendicular to the first guiding bar and provided with through holes for receiving the second guiding bar are provided on the first guiding bar, wherein the second guiding bar is inserted from the side into the support elements.
  • hooks are provided as support elements, which hooks are distributedly arranged over the length of the first guiding bar.
  • the second guiding bar is attached to or detached from such hooks by a radial and/or tangential displacement allowing for an easy handling.
  • the second guiding bar is supported moveably, in particular rotatably, in the hooks.
  • a force applied by the second guiding bar on the warp threads is reduced.
  • the second guiding bar in some embodiments is moveable with respect to the first guiding bar in the direction of its longitudinal axis.
  • limit stops are provided for delimiting or preventing a movement of the second guiding bar in the direction of its longitudinal axis .
  • the outer circumference of the first guiding bar is larger than the outer circumference of the second guiding bar, wherein in particular an outer circumference of the first guiding bar is larger than 500 mm, in particular between approximately 550 mm and approximately 800 mm and/or an outer circumference of the second guiding bar is between approximately 90 mm and approximately 230 mm.
  • the outer circumference of the first guiding bar is larger than the outer circumference of known guiding bars.
  • the larger outer circumference results in a more rigid structure allowing for a stronger tensioning of the warp threads.
  • the second guiding bar is provided with a smaller outer circumference. Thereby, a lightweight product is provided allowing for an easy handling.
  • the friction applied by the second guiding bar on the warp threads is negligible even when supporting the second guiding bar in a non-rotatable manner.
  • first guiding bar and the second guiding bar is a tubular element, in particular a circular tubular element.
  • the first guiding bar and/or the second guiding bar has an oval cross-section.
  • circular tubular elements are generally less expensive.
  • a circular tubular element may be rotated in the mounting device prior to closing the mounting device for fixing the first guiding bar. As will be described in more detail below, such a rotation allows for a user friendly installation process.
  • bearing taps are provided on a tubular element having a non-circular cross section for allowing a rotation thereof during mounting.
  • a wall thickness of the first guiding bar is between approximately 8 mm and approximately 15 mm and/or a wall thickness of the second guiding bar is between approximately 1 mm and approximately 5 mm.
  • the wall thickness is chosen in order to reduce material costs and weight of the guiding bars, while ensuring a sufficient rigidity.
  • a position of the longitudinal axis of the second guiding bar with respect to the longitudinal axis of the first guiding bar is settable.
  • markers and/or limit stops are provided for indicating a plurality of pre-set positions for the longitudinal axis of the second guiding bar. This allows an aid for the operator when setting up the back rest device.
  • the first guiding bar is mounted by a mounting device provided at least partly inside the first guiding bar.
  • the mounting device comprises two clamping elements for clamping the first guiding bar at its ends, in particular at its ends at the height of its outer circumference. Thereby, a more rigid mounting structure is provided.
  • a weaving machine comprising a back rest device arranged near a warp beam, in particular between a warp beam and shed forming elements.
  • the weaving machine is preferably designed to allow the weaving of heavy fabric.
  • other parts of the weaving machine such as a reed, a reed holder, a sley drive, healds, heald frames, heald frame drives, the warp beam, a warp beam drive, a cloth take up drive, and other elements are designed more rigid and/or more durable and/or are reinforced.
  • a method for arranging a back rest device comprising a first guiding bar, a mounting device, a second guiding bar, and a supporting device, on a weaving machine
  • the first guiding bar is inserted into the mounting device, warp threads supplied by a warp beam are arranged over the first guiding bar, and the second guiding bar is fixed to the supporting device to deflect the warp threads
  • the second guiding bar is mounted on the first guiding bar by means of the supporting device
  • the first guiding bar is rotated about its longitudinal axis for bringing the longitudinal axis of the second guiding bar into a set position with respect to the longitudinal axis of the first guiding bar
  • the first guiding bar is mounted by the mounting device in a non-rotatable manner after the longitudinal axis of the second guiding bar is in the set position.
  • the first guiding bar is rotated for positioning the second guiding bar in
  • Fig. 1 is a schematic perspective view of a back rest device 2 mounted on a weaving machine 1 for guiding warp threads 7 coming from a warp beam 10.
  • FIG 1 only one warp thread 7 is schematically shown.
  • a warp detector 12 is provided downstream of the back rest device 2
  • the back rest device 2 is provided downstream of the warp beam 10.
  • the back rest device 2 comprises a first guiding bar 3, a mounting device 4 at both side parts 16 of the weaving machine, a second guiding bar 5, and a supporting device 6.
  • the back rest device 2 is arranged near the warp beam 10, in particular between the warp beam 10 and shed forming elements 15 (schematically shown in Fig. 2 ).
  • the first guiding bar 3 is a circular tubular element. Hence, the first guiding bar 3 is also referred to as tube. In the embodiment shown, the outer diameter of the first guiding bar 3 is between approximately 200 mm and approximately 250 mm. A wall thickness of the first guiding bar 3 is chosen to allowing for a sufficient stiffness of the first guiding bar 3. In one embodiment, the wall thickness is between approximately 10 mm and approximately 15 mm.
  • the first guiding bar 3 is provided with a smooth surface for preventing any damaging of the warp threads 7.
  • the first guiding bar 3 is, for example, made of steel. In one embodiment a surface treatment is provided, so that the first guiding bar 3 has a hard chrome surface. Such a first guiding bar 3 is strong and durable. In another embodiment, the first guiding bar 3 is made of stainless steel, that is also strong and durable, but more expensive.
  • the mounting device 4 is arranged for mounting the first guiding bar 3 in a fixed mounting position and in a non-rotatable manner.
  • the mounting device 4 comprises two clamping elements 40 provided at both side parts 16 of the weaving machine 1 for clamping the two ends 34 of the first guiding bar 3.
  • Each clamping element 40 comprises a fixed clamping part 41 and a moveable clamping part 42, between which the first guiding bar 3 is clamped.
  • the first guiding bar 3 Before closing the clamping element 40 by means of the moveable clamping part 42, the first guiding bar 3 is rotatably supported by the fixed clamping part 41 having a semi-circular supporting surface.
  • the first guiding bar 3 After closing the clamping element 40 by means of the moveable clamping part 42, the first guiding bar 3 is mounted in a non-rotatable manner, in other words is clamped in a non-rotatable manner.
  • the clamping parts 41, 42 are clamped around the first guiding bar 3, for example using fastening means 43 such as screw means.
  • the clamping elements 40 are arranged for allowing the application of a high clamping force.
  • the position of the mounting device 4 is adjustable by means of the support tables 14 or along the support tables 14 of the weaving machine 1, so that the position is adjustable as well in horizontal direction as in vertical direction.
  • the second guiding bar 5 in use is arranged in parallel to the first guiding bar 3 and upstream of the first guiding bar 3 for deflecting warp threads 7 coming from the warp beam 10.
  • the supporting device 6 is arranged for supporting the second guiding bar 5 with its longitudinal axis in use at least substantially fixed in position with respect to the longitudinal axis of the first guiding bar 3.
  • the second guiding bar 5 is arranged at least substantially fixed in position with respect to the first guiding bar 3.
  • the second guiding bar 5 is also in the form of a circular tubular element.
  • the outer diameter of the second guiding bar 5 is significantly smaller than the outer diameter of the first guiding bar 3.
  • the second guiding bar 5 has an outer diameter that is less than half the outer diameter of the first guiding bar 3.
  • the outer diameter of the second guiding bar 5 is between approximately 35 mm and approximately 80 mm.
  • the wall thickness is between approximately 1 mm and approximately 5 mm.
  • a small second guiding bar 5 takes up less space, so that a warp beam 10 can be arranged closer to the first guiding bar 3, which usually allows to use a lager warp beam 10.
  • the second guiding bar 5 for example, made of the same material as the first guiding bar 3, for example of steel, in particular stainless steel, has a lower weight than the first guiding bar 3 and can be handled more easily.
  • the second guiding bar 5 in one embodiment is provided in a rotatable manner.
  • the second guiding bar 5 is provided in a non-rotatable manner, wherein the warp threads 7 slide over the surface of the second guiding bar 5.
  • the second guiding bar 5 has a smooth surface for guiding the warp threads without damaging the warp threads 7.
  • the supporting device 6 has a plurality of hooks 60 provided as support elements 8 for the second guiding bar 5, namely seven hooks 60, distributedly arranged over the length of the first guiding bar 3 for supporting the second guiding bar 5.
  • the second guiding bar 5 is held by the hooks 60 with its longitudinal axis fixed in position with respect to the longitudinal axis of the first guiding bar 3.
  • the second guiding bar 5 is supported rotatably and moveable in the direction of its longitudinal axis in the hooks 60.
  • the second guiding bar 5 is moveable radially into the hooks 60 or out of the hooks 60.
  • the second guiding bar 5 is held substantially fixed in position in the radial direction, wherein - depending on the orientation of the hooks 60, the second guiding bar 5 is held in place due to gravitational forces.
  • the warp threads 7 force the second guiding bar 5 in the hooks 60 against a movement in the radial direction.
  • the axial movement of the second guiding bar 5 can be delimited or prevented by limit stops 48, 49 that are formed in the embodiment shown, respectively, by the ends 52 of the second guiding bar 5 and an associated side surface of the clamping part 41.
  • the second guiding bar 5 is clamped in the hooks 60, for example clamped by means of elastic hooks that act as support elements.
  • the second guiding bar 5 may be held in a determined position or may be held moveable in the direction of its longitudinal axis and/or rotatable about its longitudinal axis.
  • a diameter of the warp beam 10 and, hence, a withdrawal angle of the warp threads 7 leaving the warp beam 10 is varying over time due to warp thread consumption.
  • the warp threads 7 coming from the warp beam 10 are deflected and supplied to the first guiding bar 3 with a determined angle. Therefore, with the assumption that the withdrawal angle of warp threads leaving the first guiding bar 3 is at least substantially constant, the warp threads 7 are wrapped around the first guiding bar 3 with a fixed wrap angle.
  • the warp detector 12 is arranged at a suitable height and a suitable angle with respect to the back rest device 2 in order to avoid considerable bending of warp threads 7 near the warp detector 12.
  • a known fixed arranged tube 44 can be provided, for example, for guiding superfluous warp threads or for acting as a support for an operator.
  • the first guiding bar 3 is supported rotatably about its longitudinal axis.
  • the hooks 60 are fixed on the first guiding bar 3.
  • the position of the hooks 60 and, when attached, a position of the longitudinal axis of the second guiding bar 5 with respect to the longitudinal axis of the first guiding bar 3 is adjustable in a plane perpendicular to the longitudinal axis of the second guiding bar 5.
  • the wrap angle of the warp threads 7 against the first guiding bar 3 and, hence, the tension applied to the warp threads 7 by means of the first guiding bar 3 is adjustable.
  • Fig. 2 is a schematic side view of a back rest device 2 similar to the back rest device 2 of Fig. 1 configured for weaving a heavy fabric.
  • the back rest device 2 shown in Fig. 2 differs from that shown in Fig. 1 in the hooks 60 provided for supporting the second guiding bar 5 on the first guiding bar 3.
  • the back rest device 2 shown in Fig. 2 corresponds to that of Fig. 1 and the two embodiments are described together.
  • a wrap angle of the warp threads 7 against the first guiding bar 3 of approximately 170 degrees is provided.
  • Other wrap angles may be suitable for different fabrics to be woven.
  • wrap angles between approximately 170 degrees and approximately 270 degrees against the first guiding bar 3 are chosen, so that sufficient friction is exerted on the warp threads 7 for tensioning the warp threads 7.
  • the wrap angle of the warp threads 7 about the first guiding bar 3 is substantially constant during weaving from a full warp beam to an empty warp beam.
  • the diameter of the second guiding bar 5 is substantially less than the diameter of the first guiding bar 3. In this way, the friction force exerted by the second guiding bar 5 is small. In other words, due to the large diameter of the first guiding bar 3, the warp threads 7 are guided along a long distance against the first guiding bar 3, so that sufficient frictional forces are exerted for tensioning the warp threads 7. The friction exerted by the first guiding bar 3 allows that the tension in the warp threads 7 upstream of the first guiding bar 3 is small. The diameter of the second guiding bar 5 is also small so that the friction surface about the second guiding bar 5 is also small.
  • the friction force exerted by the second guiding bar 5 will also differ.
  • the warp threads 7 are shown for a full warp beam 10.
  • the warp threads in case of an empty warp beam run according to line 9.
  • the difference in friction force exerted by the second guiding bar 5 is small with respect to the friction force caused by the first guiding bar 3.
  • the withdrawal angle varies depending on the position of the warp threads in case of a full warp beam and the position of the warp threads in case of an empty warp beam.
  • the warp threads 7 are directed downwards when leaving the first guiding bar 3.
  • a line of symmetry of the shed is under a line between the area where the warp threads 7 leave the first guiding bar 3 and the cloth line. This allows for an equal tension of warp threads moved for crossing of the shed and warp threads remaining in an extreme positioning as explained in US 5,273,079 the content of which is herewith incorporated by reference.
  • a method for installing the back rest device 2 on a weaving machine 1 is described with reference to Figs. 2 to 4 , showing a schematic side view of the back rest device 2 during weaving a fabric, before installation of the back rest device and during weaving a very heavy fabric, respectively.
  • the first guiding bar 3 When installing the back rest device 2, the first guiding bar 3 is moved in the mounting device 4 without fixing the first guiding bar 3 in the mounting device 4.
  • the warp threads 7 are arranged over the first guiding bar 3.
  • the hooks 60 extend through the warp threads 7 as shown in Fig. 3 .
  • the tube 44 Before moving the first guiding bar 3 with the hooks 60 to the position shown in Fig. 3 , the tube 44 is removed. Then the second guiding bar 5 is arranged in the hooks 60.
  • the first guiding bar 3 After arranging the second guiding bar 5, the first guiding bar 3 is rotated from the position as shown in Fig. 3 according to direction R, wherein the warp threads 7 are moved along with the second guiding bar 5 and wound in a defined wrap angle against the first guiding bar 3.
  • the first guiding bar 3 is hereby oriented in angular position in order to bring the second guiding bar 5 into a desired position, for example the position as shown in Fig. 2 .
  • Fig. 4 is a schematic side view of the back rest device 2 of Fig. 2 configured for weaving a very heavy fabric.
  • a wrap angle of the warp threads 7 against the first guiding bar 3 is approximately 270 degrees.
  • a wrap angle as shown in Fig. 2 is preferably provided.
  • the second guiding bar 5 has to be arranged at least past the line 11 shown in Fig. 2 , which line 11 indicates the direct connection between the empty warp beam 10 and the first guiding bar 3.
  • markers 45 are provided on the first guiding bar 3 and/or markers 46, 47 are provided on the mounting device 4 to allow to position and to fix the first guiding bar 3 in several pre-set positions, for example markers 45 indicating wrap angles from 0 degrees to 360 degrees and/or markers 46, 47 indicating respectively vertical and horizontal positions of the first guiding bar 3 with respect to the mounting device 4.
  • markers 45 it is possible based on the markers 45 to determine the angular position of the first guiding bar 3, and based on the markers 46 and 47 to determine the vertical and horizontal position of the first guiding bar 3.
  • a warp tension sensor (not shown) is provided that measures the tension of the warp threads 7.
  • a separate warp tension measurement device is provided that measures the tension in some or all of the warp threads 7 directly on the warp threads.
  • a sensor is provided between the back rest device 2 and the warp detector 12.
  • the warp tension is measured indirectly by measuring the forces of the first guiding bar 3 acting in the region of the mounting device 4. In both cases, a measured tension can be used for bringing the warp tension to a desired value.
  • Fig. 5 to 8 schematically show a hook 60 and support elements 8 used in a supporting device 6 of the back rest device 2 of Fig. 1
  • Fig. 7 to 9 schematically show an associated first guiding bar 3.
  • the first guiding bar 3 is provided at its two ends 34 with bearing taps 36 that can be received in the clamping elements 40 of the mounting device 4 shown in Fig. 1 .
  • the bearing taps 36 are formed by machining.
  • the hook 60 shown in Fig. 5 is provided with a curved part 600 for receiving the second guiding bar 5.
  • the hook 60 can be fixed with its distal end 601 near the first guiding bar 3.
  • a fixation element 61 is fixed with bolts 62 to the hook 60, wherein the bolts 62 extend through openings 602 in the hook 60.
  • the fixation element 61 is fixed with bolts 63 to the first guiding bar 3, which first guiding bar 3 is provided to this end with a bore hole 603 having screw thread.
  • a pin 64 is provided for positioning the fixation element 61 in an accurate position with respect to the hook 60, which pin 64 can co-operate with a slot 604 in the hook 60.
  • a pin 65 is provided to set the fixation element 61 in an accurate position with respect to the first guiding bar 3, which pin 65 can co-operate with a bore hole 605 in the first guiding bar 3.
  • the fixation element 61 has a shape that makes contact with the outer circumference of the first guiding bar 3.
  • the fixation element 61 has a flat wall that in use makes contact with a flat part that is provided at the height of the bore hole 603 on the first guiding bar 3, which flat part is made, for example, with a milling machine.
  • the pin 65 can co-operate with a bore hole 606 in the first guiding bar 3. This allows to arrange the hook 60 in a position 180 degrees turned. Because as shown in Fig. 9 , the first guiding bar 3 is designed symmetrical around an axis of symmetry 35, the first guiding bar 3 can be turned around its axis of symmetry 35 over 180 degrees. In case the first guiding bar 3 is worn due to contact with warp threads 7, the other side of the first guiding bar 3 can be used to make contact with the warp threads 7. This allows to double the lifetime of the first guiding bar 3, in particular when the warp threads 7 are guided over less than 180 degrees over the first guiding bar 3.
  • the hooks 60 are fixed in any other suitable way to the first guiding bar 3, or are welded to the first guiding bar 3.
  • the hooks 60 are flat, this means have a comparatively small extension in the direction of the longitudinal axis of the second guiding bar 5. Such hooks 60 do not open the plane of warp threads substantially, so that no "stripes" in the fabric will occur.
  • the fixation elements 61, the bolts 62 and 63, and the pins 64 and 65 do not come into contact with the warp threads 7.
  • the second guiding bar 5 is preferably of low weight and has a comparatively small outer diameter. Due to the small dimensioning, the second guiding bar 5 in one embodiment has only a limited rigidity. A sufficient number of hooks 60 is provided in order to avoid or at least delimit a bending of the second guiding bar 5 caused by the tension in the warp threads 7.
  • the second guiding bar 5 is not clamped in the hooks 60, but held in a moveable manner.
  • limit stops 48 are arranged at the ends 52 of the second guiding bar 5 to avoid or delimit such shifting.
  • the curved part 600 allows a movement of the second guiding bar 5 relative to the hooks 60 in a radial direction for attaching or detaching the second guiding bar 5.
  • closure elements are provided closing the opening of the curved part 600 for avoiding a displacement of the second guiding bar 5 in radial direction and/or in tangential direction.
  • a second guiding bar 5 having a higher rigidity is provided, wherein the number of support elements can be reduced.
  • a dimension of the second guiding bar is increased.
  • Fig. 10 shows another embodiment, wherein a second guiding bar 105 having an oval cross-section supported in support elements 8 such as hooks 160 is provided.
  • the orientation of the second guiding bar 105 in this embodiment is chosen so that the warp threads 7 exert a force on the second guiding bar 105 in a direction where the second guiding bar 105 is more rigid against bending.
  • a frictional force is exerted on the warp threads 7 by means of the second guiding bar 105 which may be slightly higher than that exerted by the second guiding bar 5 shown in Figs. 1 to 4 .
  • the back rest device 2 shown in Fig. 10 corresponds to that of Fig. 2 and for a detailed description, reference is made to Fig. 2 .
  • the first clamping part 41 is fixed via a fixation block 50 to the support table 14.
  • a fixation block 50 In the clamping part 41, as schematically shown in Figs. 2 , 3 , 4 and 10 , different bore holes 51 are arranged to be able to position the clamping part 41 via the fixation block 50 in different positions with respect to the support table 14. This allows to set the first guiding bar 3 in a desired position. Of course this setting of position can be done in other known ways.
  • first and second are only used to distinguish between the first guiding bar 3 and the second guiding bar 5. It is, for example, also possible to call the first guiding bar 3 that is mounted fixedly “back rest bar” or “back rest roller”, and the second guiding bar 5 “tension bar” or “tension roller”.
  • the warp threads 7 move from the warp beam 10 firstly via the second guiding bar 5 and subsequently via the first guiding bar 3 to shed forming elements 15, so that in use according to the movement direction of the warp threads 7 from the warp beam 10, the second guiding bar 5 is arranged upstream of the first guiding bar 3, in other words the first guiding bar 3 is arranged downstream of the second guiding bar 5.
  • first guiding bar 3 as the second guiding bar 5 are executed as a hollow guide bar, in other words as a tubular element, according to a variant, it is also possible to execute at least one of the guiding bars 3, 5 as a solid guiding bar, for example the second guiding bar 5.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (13)

  1. Streichbaumeinrichtung zum Führen von aus einem Kettbaum (10) kommenden Kettfäden (7) umfassend eine erste Führungsstange (3) zum Führen von Kettfäden (7), eine zweite Führungsstange (5, 105) zum Führen von Kettfäden (7), welche zweite Führungsstange (5, 105) im Gebrauch parallel zu der ersten Führungsstange (3) und stromaufwärts der ersten Führungsstange (3) angeordnet ist zum Ablenken von aus dem Kettbaum (10) kommenden Kettfäden (7), eine Montagevorrichtung (4), welche Montagevorrichtung (4) angeordnet ist, um die erste Führungsstange (3) in einer festen Montageposition und in einer nicht drehbaren Weise zu montieren, und eine Trageinrichtung (6), welche Trageinrichtung (6) angeordnet ist, um die zweite Führungsstange (5, 105) zu tragen, so dass im Gebrauch die Längsachse der zweiten Führungsstange (5, 105) in Bezug auf die Längsachse der ersten Führungsstange (3) ortsfest montiert ist, dadurch gekennzeichnet, dass die zweite Führungsstange (5, 105) auf der ersten Führungsstange (3) mittels der Trageinrichtung (6) montiert ist, und dass die Position der Längsachse der zweiten Führungsstange (5, 105) in Bezug auf die Längsachse der ersten Führungsstange (3) einstellbar ist, wobei, um die Längsachse der zweiten Führungsstange (5, 105) in eine eingestellte Position in Bezug auf die Längsachse der ersten Führungsstange (3) zu bringen, die erste Führungsstange (3) um ihre Längsachse drehbar ist, um die erste Führungsstange (3) in einer Winkelposition zu orientieren.
  2. Streichbaumeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Trageinrichtung (6) eine Vielzahl von über die Länge der ersten Führungsstange (3) verteilt angeordneten Tragelementen (8) zum Tragen der zweiten Führungsstange (5, 105) umfasst.
  3. Streichbaumeinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass als Tragelemente (8) Haken (60, 160) vorgesehen sind, welche Haken (60, 160) verteilt über die Länge der ersten Führungsstange (3) angeordnet sind.
  4. Streichbaumeinrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die zweite Führungsstange (5, 105) beweglich, insbesondere drehbar, in den Haken (60, 160) getragen ist.
  5. Streichbaumeinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass Endanschläge (48, 49) zur Begrenzung oder Verhinderung einer Bewegung der zweiten Führungsstange (5, 105) in Richtung ihrer Längsachse vorgesehen sind.
  6. Streichbaumeinrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die zweite Führungsstange (5, 105) angeordnet ist, so dass die durch Reibungseffekte aufgebrachte Spannung wesentlich geringer ist als die von der ersten Führungsstange (3) aufgebrachte Spannung.
  7. Streichbaumeinrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Aussenumfang der ersten Führungsstange (3) grösser ist als der Aussenumfang der zweiten Führungsstange (5, 105), wobei insbesondere ein Aussenumfang der ersten Führungsstange (3) grösser ist als 500 mm, insbesondere zwischen etwa 550 mm und etwa 800 mm und/oder ein Aussenumfang der zweiten Führungsstange (5, 105) zwischen etwa 90 mm und etwa 230 mm liegt.
  8. Streichbaumeinrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass entweder eine oder beide der ersten Führungsstange (3) und der zweiten Führungsstange (5, 105) als Rohrelement, insbesondere als kreisförmiges Rohrelement, ausgebildet ist.
  9. Streichbaumeinrichtung nach Anspruch 8, dadurch gekennzeichnet, dass eine Wandstärke der ersten Führungsstange (3) zwischen etwa 8 mm und etwa 15 mm liegt und/oder eine Wandstärke der zweiten Führungsstange (5, 105) zwischen etwa 1 mm und etwa 5 mm liegt.
  10. Streichbaumeinrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass Marker (45, 46, 47) zum Anzeigen einer Vielzahl von voreingestellten Positionen für die Längsachse der zweiten Führungsstange (5, 105) vorgesehen sind.
  11. Streichbaumeinrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Montagevorrichtung (4) zwei Klemmelemente (40) zum Klemmen der ersten Führungsstange (3) an ihren Enden (34) umfasst.
  12. Webmaschine umfassend eine Streichbaumeinrichtung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Streichbaumeinrichtung (2) in der Nähe eines Kettbaums (10), insbesondere zwischen einem Kettbaum (10) und Fachbildungselementen (15), angeordnet ist.
  13. Verfahren zum Anordnen einer Streichbaumeinrichtung nach einem der Ansprüche 1 bis 11 umfassend eine erste Führungsstange (3), eine Montagevorrichtung (4), eine zweite Führungsstange (5, 105) und eine Trageinrichtung (6), an einer Webmaschine (1), wobei die erste Führungsstange (3) in die Montagevorrichtung (4) eingesetzt ist, von einem Kettbaum (10) zugeführte Kettfäden (7) über der ersten Führungsstange (3) angeordnet sind, die zweite Führungsstange (5, 105) an der Trageinrichtung (6) befestigt ist, um die Kettfäden (7) abzulenken, wobei die zweite Führungsstange (5, 105) mittels der Trageinrichtung (6) auf der ersten Führungsstange (3) montiert ist, und wobei nach dem Befestigen der zweiten Führungsstange (5, 105) an der Trageinrichtung (6), um die Längsachse der zweiten Führungsstange (5, 105) in eine eingestellte Position in Bezug auf die Längsachse der ersten Führungsstange (3) zu bringen, die erste Führungsstange (3) um ihre Längsachse drehbar ist, um die erste Führungsstange (3) in einer Winkelposition zu orientieren, und die erste Führungsstange (3) durch die Montagevorrichtung (4) in einer nicht drehbaren Weise montiert ist, nachdem die zweite Führungsstange (5, 105) in der eingestellten Position ist.
EP14739072.8A 2013-07-15 2014-06-23 Streichbaumvorrichtung für eine webmaschine Active EP3022345B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2013/0491A BE1021709B1 (nl) 2013-07-15 2013-07-15 Sleepinrichting voor een weefmachine
PCT/EP2014/063192 WO2015007461A2 (en) 2013-07-15 2014-06-23 Back rest device for a weaving machine

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EP3022345A2 EP3022345A2 (de) 2016-05-25
EP3022345B1 true EP3022345B1 (de) 2019-04-03

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EP (1) EP3022345B1 (de)
CN (1) CN105378170B (de)
BE (1) BE1021709B1 (de)
TR (1) TR201909154T4 (de)
WO (1) WO2015007461A2 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125128A (en) * 1964-03-17 Pfarrwaller
US1573777A (en) * 1925-07-18 1926-02-16 Draper Corp Center brace for drag rolls of looms
FR694058A (fr) * 1929-04-19 1930-11-28 Dispositif de réglage automatique avec mécanisme tendeur pour le déroulement de la chaîne dans les métiers à tisser
CH523994A (de) * 1970-02-19 1972-06-15 Sulzer Ag Vorrichtung zum Erzeugen der Kettspannung an einer Webmaschine
CH667294A5 (de) * 1985-02-14 1988-09-30 Saurer Diederichs Sa Streichbaumanordnung an einer webmaschine.
CN2647882Y (zh) * 2003-07-31 2004-10-13 杭州奇观机电有限公司 快速送经及纱架式恒张力装置
CN2873818Y (zh) * 2006-02-15 2007-02-28 青岛红旗纺织机械有限公司 喷气织机新型后梁结构
DE202010004517U1 (de) * 2010-04-01 2011-10-05 Lindauer Dornier Gmbh Vorrichtung zum Ausgleich von Zugkraftänderungen in Kettfäden an einer Webmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3022345A2 (de) 2016-05-25
CN105378170A (zh) 2016-03-02
WO2015007461A3 (en) 2015-05-14
CN105378170B (zh) 2017-07-04
WO2015007461A2 (en) 2015-01-22
TR201909154T4 (tr) 2019-07-22
BE1021709B1 (nl) 2016-01-11

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