Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/40—Forming selvedges
  • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

• the invention relates to a device to form fabric tuck-in selvedges in weaving machines.
• a pneumatic nozzle be­ ing directed against the direction of the weft insertion Between said pincers and the fabric selvedge there is located a pneumatic nozzle be­ ing directed against the direction of the weft insertion. Between the orifice of the nozzle and the selvedge of the fabric being formed there is pivotally mounted a warp thre­ ads opening mechanism, said mechanism consisting of a pair of lamellae mounted above each other. After weaving in and cutting the weft, the opening mechanism turns into the newly opened warp threads in the next shed as close to the fabric face as possible. Pneumatic nozzle blows the end of the preceding weft into thus formed guideway in the shed and then the guideway returns back along its path out from the warp threads.
• This device shows again the disadvantages of the foregoing mechanical devices and moreover, the nozzle located direct­ ly against the path of the weft being inserted does not meet the requirement of reliable reversing and inserting the end of the weft into the next shed
• the advantage of the device according to the invention is its simplicity as to the design and technology, simple pro­ duction and minimum dimensions.
• Another advantage of the device according to the invention is damping of a noncon­ trolled motion of the weft in the head prior to its tucking-­ in in the next shed by a flow of the pressure fluid. This results in high quality and evenly tuck-in selvedges of the fabric.
• the device according to the invention does not limit the weaving frequency like mechanical devices and moreover due to its small dimensions it enables access to the reed and to the selvedge of the fabric being formed.
• Fig.1 is a schematic plan view of a part of a jet weaving machine in the place of formed fabric in the moment of the weft insertion and Fig.2 at the reed beat-up.
• Fig.3 is a schematical detail of the device with illustrated outline of the air flow and motion of the weft end in individual phases.
• Fig.4 is an exemplary embodiment in a side view and Fig.5 is its ground plan.
• Fig.6 is another embodiment of the device according to the invention in side view and Fig.7 is its plan view.
• Fig.8 is a side view of the devi­ ce provided with a couple of gravitational brakes and Fig.9 is their top view.
• Fig.10 is a side view of an alternative embodiment of the device with spring-loaded brake and Fig. 11 is its top view.
• the device to form tuck-in selvedges in a weaving machine is located at the edge of the fabric 1 in the place of the fell 2 between the edge of the fabric 1 and adjacent cutter 3 .
• the device according to the invention is at the inserti­ on inlet and end side of the weft 5 being inserted by a main nozzle 4 located on a stationary part of the weaving machine.
• another cutter 3 which is together with said device mounted on a not shown movable part of the weaving machine, said movable part of the weaving machine performing a reverse motion away from the fell 2 of the fabric 1 and back for the reason to free the path of insertion of the weft 5 during insertion.
• the device according to the invention consists of a head 6 into which leads a not shown supply of the pressure fluid.
• the not shown supply of the pressure fluid is connected to a nozzle 7 situated longitudinally beside the edge 8 of the fabric 1 with its orifice 9 opposite to the direction of the reed 10 beat-up.
• a slot in the head 6 in front of the orifice 9 of the nozzle 7 there is a slot in the head 6 as shown in Figs 4 and 5, said slot being defined by a pair of surfaces 11 placed above each other, where in each surface there is an arcuate recess, the outline edge of which forms a transver­ sal guiding surface 12, comprising from the viewpoint of the pressure fluid flow an inlet part 13 and an outlet part 14 .
• Inlet part 13 of the guiding surface 12 corres­ ponds as to the direction with the nozzle 7 and the out­ let part 14 with a not shown longitudinal axis of the reed 10 .
• the embodiment according to Figs 6 and 7 has again an accor­ dingly situated nozzle 7 like in Figs 4 and 5, only the pair of surfaces 11 located above each other, has another shape.
• the upper surface of the pair of surfaces 11 of the head 6 is inclined towards the orifice 9 of the nozzle 7 .
• a part of the lower surface of the pair of surfaces 11 is stepped-­ up above the orifice 9 of the nozzle 7 .
• the outline edge of said recess forms the guiding sur­ face 12 .
• a centering projection 15 In the not stepped-up part of the lower surface of the pair of surfaces 11 there is a centering projection 15 .
• the weft 5 inserted into a not shown warp yarns 16 shed, is beaten-up by the reed 10 to the fell 2 at the face of the fabric 1 .
• the weft 5 gets into the slot between the pair of surfaces 11 to the orifice 9 of the nozzle 7 .
• the weft 5 is cut-­ off by cutter 3 from the main nozzle 4, eventually also in the center of the fabric 1 in case of zone weaving. Then a not shown supply of the pressure fluid 17 is opened and said fluid begins to flow out from the orifice 9 of the nozzle 7 .
• Flowing pressure fluid 17 begins to expand and its is direc­ ted by the inclined guiding surface 12 into the next opened shed. Flowing pressure fluid 17 entrains at the orifice 9 of the nozzle 7 the free end of the weft 5 , bends it and tucks it in the next shed, where it is woven-in.
• the orifice of the nozzle 7 is located in the weaving pla­ ne of the weaving machine.
• the ends of the weft 5 enter and get out from the head 6 of the device when tucking in one plane.
• the ends of the wefts 5 are first somewhat lifted by the stepped-up lower surface of the pair of surfaces 11 and then they slide down towards the orifice 9 of the nozzle 7 .
• the pres­ sure fluid 17 flown into the transverse guiding surface 12 , while the end of the weft 5 is directed by the projection 15 to the level of the weaving plane. The flow of the pres­ sure fluid 17 is utilized better.
• the head 6 is in its upper part provided with a pair of parallel passage grooves 18 directed into the slot in the head 6 .
• a body forming in the slot between the pair of surfaces 11 a brake 19 of the end of the weft 5 .
• the brakes 19 are secured in the head 6 by means of a pin 20 guided in vertical groove 21 .
• the brake 19 is secured in the head 6 by a spring 22 , while the diameter of the wire of the spring 22 is smal­ ler than the diameter of the opening 23 .
• the nozzle 7 is in this case inclined and it is directed with its orifice 9 to the brake 19 .
• said free ends of the wefts 5 in newly formed fabric 1 are affected by cyclic contracting motion of the fabric 1 after the reed 10 beat-up. This effect shows itself especially with larger setts and larger reed widths. Contraction of the fabric 1 after the beat-up has caused extraction of free ends of the wefts 5 from their original paths. Tuck-in flow of the pres­ sure fluid 17 did not act on the free ends of the wefts 5 on their necessary length.
• the brakes 19 can be either of a gravity type, they act on the ends of the wefts 5 in the head 6 by the weight of their mass or their pressure can be induced and adjusted by means of a spring 21 , as illustra­ ted in Figs 10 and 11 by way of an example.
• Described devices according to the invention are only exem­ plary embodiments.
• the devices according to the invention can be used in all types of weaving machines.

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Citations (3)

• 1988
  • 1988-04-28 EP EP19880106837 patent/EP0291744A3/de not_active Withdrawn
  • 1988-05-17 JP JP11838488A patent/JPS6452849A/ja active Pending

Patent Citations (3)

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