Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D37/00—Circular looms
• • 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
  • D03D49/12—Controlling warp tension by means other than let-off mechanisms
  • D03D49/14—Compensating for tension differences during shedding
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
  • D03J5/00—Shuttles
  • D03J5/24—Tension devices

Definitions

• the invention relates to a circular weaving machine for producing a circular fabric, comprising: a main axis, a reed for guiding a shuttle for weft ribbons, a storage holder for warp ribbons, a feed device for drawing in the warp ribbons from the storage holder, an arrangement of guide and length compensation elements with bushings for the warp tapes drawn in by the pull-in device, an outer stop against which the guide and length compensation elements are placed in an outer stop position in a basic state unloaded by the warp tapes, an inner stop on which the guide and length compensation elements are placed in an inner stop position, a center stop , on which the guide and length compensation elements are applied in a working position, the guide and length compensation elements each having a spring bar with a first spring bar part, on which the passage is provided, the first spring bar part being in the working position by bending up to the inner stop position can be deflected on the inside stop.
• Such a circular weaving machine is known, for example, from EP 2 829 645 A1.
• the circular loom has warp ribbon guide elements that are arranged around a circular reed to feed a large number of warp ribbons.
• Shed forming devices group the supplied warp bands into two warp bands and give them mutually opposite alternating movements, whereby a weaving shed is opened and closed between the two warp bands.
• a shuttle moves on an orbit in the open shed and picks it up Weft ribbons from a weft ribbon spool held by him into the shed, whereby a fabric is formed.
• the fabric is drawn off through a weaving ring.
• the small warp guide elements are designed as length compensation compensators, each of which comprises a spring bar and an eyelet at the upper end of the spring bar for guiding through and deflecting a small warp.
• These length compensation elements also referred to below as compensators, have the task of compensating for the different lengths of the warp ribbons during the shed stroke, which is achieved when changing between the upper and lower shed after each shooter round, and thus to provide tension compensation.
• the compensators can fulfill a monitoring function. The circular loom can be stopped if the compensators hit the inner stop in the event of a warp tape break, warp tape run-out at the outer stop and warp tape overtension. This can reduce defective tissue production and waste.
• the compensators have a default setting for the empty state, i. H . without warp bands and consequently without warp band pull towards the center of the circular loom.
• the compensators are cast into a bearing mount.
• Separate tension springs are provided below the bearing bracket, which are connected to the compensators at one end and to another ring, the so-called tension spring ring, at the other end. From this guide is shown in Fig. 3 of the present disclosure. With the help of these separate tension springs, the compensators are brought into the outer parked position by hitting an outer ring.
• the compensators are moved by the warp ribbon tension against the tension spring force of the tension spring in the direction of the center of the weaving machine until the lower ends of the compensators are in contact with another stop ring.
• the compensator begins to work. From this position, only the bending spring force of the compensator acts, because the The effective length of the tension spring is limited by the ring in the working position and is therefore already used up. From this working position, the compensator interacts with the warp tape feed. The compensator can therefore move continuously by bending, starting from the working position up to the inner stop, when the tension of the warp bands increases. When the warp ribbon tension decreases, the compensator moves back in the direction of the outer stop position, whereby the tension spring comes into effect again.
• the positions of the compensators can differ due to the indentation, which has the same effect for all warp tapes, and the differences in tension of the warp tapes resulting from the weaving process (gate passage, incorporation). Due to the fact that the warp tapes are drawn in at the same speed as the fabric take-off speed, there is no possibility of actively and controlled influencing the individual warp tape tension. As a result, warp ribbons that are too loose or too tight can often occur. On the way from the storage holder to the reed, angle, friction and tension differences between the individual warp bands can also increase the position differences and thus cause loose or too loose. cause warps that are too tight.
• the present invention sets itself the task of alleviating or eliminating at least individual disadvantages of the prior art. to fix .
• the spring rods each have a second spring rod part, which presses the guiding and length-compensating element into the outer stop position in the basic state, unloaded by the warp bands.
• the second spring bar parts are set up to bring the first spring bar parts into the outer stop position when the guide and length compensation elements are in the unloaded basic state, d. H . without tension through the warp ribbons are.
• the prestressing of the guide and length compensation element also referred to as a compensator, can be generated by counterstressing the spring rod itself.
• a separate tension spring can thus be dispensed with, which in the prior art presses the spring rods into the outer stop position. As a result, tension springs with the disadvantages described above can be avoided.
• the second spring rod part is so flexible that the guide and length compensation element in the unloaded basic state by the elastic restoring force due to the Bending of the second spring rod part is transferred to the outer stop position.
• the first spring rod part is also flexible. If the guide and length compensation element is arranged against the spring force of the second spring bar part in the working position at the center stop, the first spring bar part can be elastically deflected depending on the tensile stress through the warp against the restoring force due to the bending of the first spring bar part up to the inner stop position at the inner stop.
• the spring rod remains attached to the center stop.
• the first spring bar part can have an eye or a maillion, in particular at the upper end, as a passage for the passage of the respective warp ribbon.
• the location and directional information such as "hori zontal", “vertical”, “above”, “below” relate to the intended operating state of the circular loom on a hori zontal floor with a vertical alignment of the main axis.
• “Inside” means closer to the main axis, i .e . closer to the center of the circular loom.
• “Outside” means further from the main axis, i .e . H . from the center of the circular loom .
• the guide and length compensation element is moved towards the center of the circular loom by the warp ribbon pull on the bushing until the guide and length compensation element is in contact with the center stop. In this prestressed state, the guide and length compensation element is in the working position. Based on this, the first spring rod part of the guiding and length-compensating element begins to compensate for the change in length of the warp ribbon that occurs due to the change of shed for the shooter's run.
• the suspension area of the first spring rod part provided for this purpose from reaching the working position (coming from the outer stop position) up to a maximum of the inner stop position, is set up to compensate for the change in length of the warp ribbon caused by the change of shed in such a way that the guide and length compensation element in the working position located at a sufficient distance from the outer and inner stop position. While the guide and length compensation element oscillates around the working position, the weaving process, in particular due to different incorporation of the warp, different warp ribbon density and warp ribbon tension, can cause individual warp ribbons to become looser or tighter during operation. become more excited.
• the circular loom preferably has a device for shutting down the circular loom due to a stop of one of the guide and length compensation elements in the outer stop position and/or in the inner stop position
• Warp band tension can be reliably prevented, since in particular tension springs and thus tension spring hooks or chafed through. rings are omitted.
• the design of the guide and length compensation elements with the second spring bar parts enables a more compact design compared to the prior art. Due to the omission of the tension springs, the warp ribbon overflow bracket used in the prior art directly in front of the compensation can be dispensed with. In a preferred embodiment, therefore, no warp overflow bracket is provided directly in front of the guide and length compensation elements.
• the circular weaving machine preferably has an eyelet bow. Compared to the prior art, this eyelet bend can move upwards.
• the eyelet bow is preferably located at a level above the lower end of the guiding and length-adjusting element, in particular adjacent to the lower compartment when the compartment is fully open. This would not be possible with the prior art because the warp ribbons could collide with the tension springs.
• a further advantage of the above embodiment lies in the equalization of the entry angles of the individual warp bands, as they are distributed over 360°.
• first and the second spring rod part the same, preferably round, in particular circular, cross-section.
• first and second spring rod parts are configured as first and second section of the spring bar formed.
• first and second spring rod parts are preferably designed in one piece.
• the first and second spring bar parts can be formed by sections of a round wire.
• the passage, in particular at the upper end of the first spring bar part, can also be formed by a section of the one-piece spring bar, in particular round wire.
• the elongated spring rods can each have a length of 100 to 500 millimeters (mm).
• the spring rod can have a diameter of 1 mm to 3 mm, in particular essentially 2 mm.
• spring rods can be provided for prestressing the guide and length compensation elements in the outer stop position.
• the spring rods are bent at least once by more than 90°, in particular at least once by more than 135°, relative to the outer stop position to form the first and second spring rod parts. At least one bending point is therefore provided in this embodiment.
• the spring rods are each bent exactly once by more than 135°, relative to the outer stop position, to form the first and the second spring rod part.
• the spring rods are preferably bent essentially in a U-shape. This embodiment is advantageous for manufacturing reasons because only a single bending point is required, but at the same time a space-saving arrangement is made possible.
• the spring bars are each bent at least twice by more than 135°, in particular exactly three times by more than 135°, relative to the outer stop position to form the first and the second spring bar part.
• the spring bars are preferably essentially “W”-shaped. This embodiment is particularly space-saving.
• the second spring bar parts are arranged at an angle of less than 30° to the first spring bar parts, relative to the outer stop position.
• the spring bars are preferably essentially “I”-shaped.
• the second spring bar parts in particular at their free ends, are each placed under prestress on a stop element (stationary during the weaving process), in particular on a stop ring.
• the guiding and length compensation elements are preferably arranged in a ring-shaped arrangement around the reed.
• the warp ribbons can be guided from the guide and length compensation elements through openings in the reed.
• shedding devices can be distributed around the reed between the guide and length compensation elements and the reed for opening or Closing a shed be provided.
• the spring rods are held on bearing mounts in a preferred embodiment, each of which is mounted on a bearing element (stationary during the weaving process), in particular a bearing ring are .
• spring rods are detachably arranged on the bearing mounts, preferably via plug-in connections. This embodiment is also advantageous from an ecological point of view.
• the spring rods are preferably made of metal and/or the bearing mounts are made of plastic.
• the bearing mounts are located between opposite ends of the spring bars.
• the spring bars can each have a holding part, in particular a holding section of the spring bar, which extends between the first and the second spring bar part.
• the holding part, in particular the holding section, is held on the bearing mount.
• the bearing mounts are designed as pivot bearing mounts, which are pivoted during the transition of the guide and length compensation elements between the working position and the outer stop position, preferably about a horizontal pivot axis.
• the pivot bearing mounts each have a stop surface which is abutted against the center stop in the working position.
• the stop surface of the pivot bearing mount can be curved, in particular corresponding to an outer contour of the center stop.
• the first spring bar parts can be deflected by elastic bending in the direction of the inner stop position in order to enable dynamic length compensation of the warp ribbons when changing sheds.
• the spring rods are each held in a retaining groove of the pivot bearing mount.
• the spring rods are securely held on the pivot bearing mounts.
• Another advantage is that the bearing width of the guide and length compensation elements is increased .
• the bearing width of the guide and length compensation element, including a desired play, preferably corresponds to a circumference of the bearing ring minus any fastening points on the weaving machine, divided by the maximum number of warp bands on the weaving machine. As a result, the separators used in the prior art between the individual guide and length compensation elements can be omitted.
• the spring bars are arranged on the pivot bearing mounts such that an effective length of the first spring bar parts (i.e. the portion of each first spring bar part available for deflection) decreases from the working position towards the inner stop position.
• This is preferably achieved in that the length of the support of the spring bar on the pivot bearing mount increases from the working position towards the inner stop position.
• the support for the spring bar has at least one edge at which the effective length of the first spring bar part between reaching the working position and the inner stop position is shortened.
• the effective spring length of the first spring bar part is shortened in steps.
• the support for the spring bar has a curved support surface which continuously shortens the effective length of the first spring bar part towards the inner stop position.
• the pivot bearing mounts each have a hook, preferably pointing downwards, which prevents the pivot bearing mount from pivoting outwards, d. H . away from the center of the circular loom , restricted .
• the bearing mounts are arranged at the ends of the second spring rod parts opposite the passages for the warp ribbons.
• the outer stop, the inner stop and the middle stop can be arranged between the passage at one end of the spring bar and the bearing holder at the other end of the spring bar.
• Fig. 1 shows a schematic side view of a circular weaving machine according to the invention, in which the compensation device for the guidance and the length compensation of the warp ribbons has individual spring rods with first spring rod parts and second spring rod parts.
• FIG. 2 schematically shows the circular loom of FIG. 1 in top view .
• Fig. 3 schematically shows guiding and length compensation elements according to the prior art.
• Fig. 4 schematically shows an embodiment of the guiding and length compensation elements according to the invention.
• Fig. 5 shows a further embodiment of the guiding and length compensation elements.
• Fig. 6 to 9 show different embodiments of the guiding and length compensation elements according to the invention in a basic state unloaded by the warp ribbons.
• FIG. 10 to 13 show the FIG. 6 to 9 corresponding views of the guiding and length compensation elements in a working position.
• Fig. 1 and fig. 2 shows a circular weaving machine 1 which is intended for the use of ribbons, threads, monofilaments and multifilaments as warp ribbons and weft ribbons.
• the circular weaving machine 1 has a circular reed (not shown for the sake of clarity), hereinafter referred to as reed for short, which is ring-shaped around an essentially vertical main or Main axis 2, along which runs a machine shaft, is arranged.
• a shooter (not shown) is guided along the reed with a ribbon spool for dispensing ribbon.
• the circular loom 1 also has a storage holder 3, a so-called creel, on which warp ribbon bobbins 4 with warp ribbons 5 are arranged vertically one above the other in horizontal rows.
• a storage holder 3 On the opposite side of the circular loom 1, mirrored with respect to the main axis 2, there is another storage holder
• the warp ribbons are fed from the warp ribbon spools 4 via creel eyes 6 at angles 6A to a draw-in device 7 which has a deflection roller 8 and a draw-in roller 9 .
• the feed roll ze 9 is driven by a motor in order to influence the feed of the warp bands 5 .
• the warp ribbons 5 are fed after the draw-in device 7 via further deflection rollers 10, 11 and an eyelet bend 12 to an arrangement of guiding and length-compensating elements 13, so-called compensators, described in detail below, which run around the main axis 2 , are arranged outside the reed.
• compensators described in detail below
• dynamic fluctuations in the warp ribbon tension are compensated.
• shedding devices are distributed around the reed, with which two warp ribbon sheets (shown schematically) are produced, which alternately move upwards and downwards in opposite directions to one another. perform downwards, whereby a shed is opened and closed. When open, the shed forms a space defined by the two warp bands, through which the Shooter moves with the weft ribbon spool and releases a weft ribbon (not visible) in order to produce the circular fabric 14 .
• Fig. 4 schematically shows an embodiment of the guiding and length compensation element 13 as a spring bar 16 with a first spring bar part 17 and a second spring bar part 18 .
• the first spring rod parts 17 have bushings 19, in particular one eye or an eyelet or a maillon, through which the warp 5 are guided.
• the guide and length compensation elements 13 interact with an outer stop 20, an inner stop 21 and a middle stop 22 (each only shown schematically in FIG. 4).
• an outer stop position shown in FIG. 4 is labeled "A”
• the first spring rod part 17 rests against the outer stop 20.
• an inner stop position which is labeled "C” in FIG. 4
• the first spring rod part 17 rests against the inner stop 21.
• the tension spring 15 is used to bring the guide and length compensation element 13 into the outer stop position on the outer stop 20 .
• the second spring bar part 18 is set up to push the spring bar 16 into the outer stop position.
• an overflow bracket 23 (cf. FIG. 3) can be dispensed with.
• the spring bar 16 is bent exactly once by more than 135° to form the first 17 and the second spring bar part 18, based on the outer stop position of the guide and length compensation element 13.
• the second spring rod part 18 is elastically prestressed at one end of the spring rod 16 opposite the passage 19 and is placed against a stop element 24 (stationary during the weaving process), in particular on a stop ring running annularly around the main axis 2 (in Figs. 6 to 13 the stop element 24 is symbolized with "V" for pretension).
• the spring rod 16 is held on a bearing holder 25 - which can only be seen schematically in Fig . 1 and Fig . 4 - which is attached to a bearing element 26 (stationary during the weaving process), in particular is mounted on a ring-shaped bearing ring running around the main axis 2 .
• Fig. 5 shows a further embodiment of the guiding and length compensation element 13 in the working position attached to the center stop 22, with three different bending states of the first spring rod part 17 being shown during dynamic length compensation of the tensile stresses by the warp ribbon.
• the spring bar 16 is bent at a first bending point 27 , a second bending point 28 and a third bending point 29 .
• the spring bar 16 is detachably held, here via a plug connection, on the bearing bracket 25, which is designed as a pivot bearing bracket between the opposite ends of the spring bar 16 in the embodiment shown.
• the pivot bearing mount has a pivot axis 31 about which the pivot bearing mount can be pivoted relative to the bearing element 26 .
• the pivot bearing mount has a stop surface 34 which, when the working position is reached, is struck from the outer stop position on the center stop 22 in order to permit further inward pivoting of the pivot bearing mount when the spring rod 16 moves to the inner stop position of the spring rod 16 To block .
• the spring rod 16 is held in a holding groove 32 on the end face of the pivot bearing mount.
• the retaining groove 32 transitions into a support 33, here a support groove, against which the first spring rod part 17 rests when it is deflected towards the inner stop position after it has reached the working position.
• the pivot mount also includes a downwardly directed hook 34 .
• Fig. 6 to 9 show different embodiments of the guiding and length-compensating elements 13 which are applied in the outer stop position in the basic state in which there is no load from the warp bands 5 .
• figs. 10 to 13 show the corresponding views for the working position of the guide and length compensation elements 13 attached to the center stop 22 .
• Fig. 6 and figs. 10 show an embodiment in which the first 17 and the second spring rod part 18 are essentially I-shaped in the basic state (cf. FIG. 6), i. H . substantially in a line.
• the free end of the second spring rod part 18 is prestressed with the aid of the stop element 24 .
• FIG. 7 and figs. 11 show the embodiment of FIG. 1 and 4, so that reference can be made to the explanations above.
• Fig. 8 and figs. 12 show, in a simplified representation, the embodiment of FIG. 5, so that reference can be made to the explanations above.
• Fig. 9 and Fig. 13 show an embodiment in which the
• Bearing bracket 25 is provided at one end of the spring rod 16 opposite the implementation 19 .

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

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Citations (6)

• 2021
  • 2021-12-22 AT ATA51031/2021A patent/AT524953B1/de active
• 2022
  • 2022-12-09 TW TW111147466A patent/TW202344731A/zh unknown
  • 2022-12-22 EP EP22835559.0A patent/EP4453297A1/de active Pending
  • 2022-12-22 CN CN202280084274.6A patent/CN118434926A/zh active Pending
  • 2022-12-22 WO PCT/AT2022/060458 patent/WO2023115091A1/de active Application Filing

Patent Citations (6)

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