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 an edge insert for a loom for inserting an end of a weft into a shed with a holder which is provided with means for receiving the end of the weft inserted into a shed and for blowing the end into a subsequently formed shed, the means are connected to a compressed air source for blowing in via a valve which can be controlled by a control unit.
• Such an edge insert is known from US 4 957 144.
• the end of the inserted weft thread is first held pneumatically and then blown into a shed using blow openings.
• the blowing openings are provided in a holder arranged on the side of the shed.
• An edge insert is also known from US 1 426 351, in which the end of a weft thread is received in a guide element of a holder and then blown into the subsequently formed shed by means of a blowing device.
• the blowing device has a nozzle which is arranged at an angle to the stop edge of the fabric in order to blow the end of the weft thread held in the guide element in the direction of the stop edge.
• Another device is also known from US Pat. No. 2,267,287, in which a plurality of nozzles, each with a different blowing direction, are provided in order to deflect the end of a weft thread and to blow in the direction of the stop edge.
• the invention has for its object to design an edge insert of the type mentioned so that it is suitable for any fabric.
• This object is achieved in that the holder is provided with at least one rotatably arranged insert which can be connected to the compressed air source and has at least one blowing opening, the position of which is adjustable.
• the edge insert By changing the position of the blowing opening, the edge insert can be easily adapted to the fabric and / or the weft thread to be woven.
• the position of the blow opening can be changed in that the insert is exchanged for an insert with another blow opening or with a blow opening at another location and / or that the insert is adjusted and, in particular, rotated in its angular position. This is an advantage when changing the fabric to be woven.
• the insert can also be replaced when worn, without the entire holder or the entire edge insert having to be exchanged and / or removed.
• the insert has an axial duct which can be connected to a compressed air source and at least one essentially radially directed blowing opening. Such training is advantageous to blow the end of the weft into the shed.
• the holder is provided with a guide slot for weft threads and that the or the inserts are arranged in front of the end of the guide slot. It is also advantageous if at least some of the components that come into contact with the weft threads are provided with wear-resistant covers. This makes it possible to easily replace such covers without having to replace the entire holder or the entire device.
• the insert can also be a wearing part that can be replaced if necessary.
• the holder is provided with a pneumatic holding device for the end of a weft thread. This allows the weft to be held in a certain position, from which it can then be blown into the shed is blown in.
• This pneumatic holding device is also suitable for holding the end of a weft thread securely after it has been cut off.
• a cutting device for weft threads is provided on the side of the holder facing away from the tissue.
• the length of the end of the weft thread to be blown into the advertising compartment by means of the edge insert can be precisely defined. It is advantageous if the cutting device is mounted at an adjustable distance relative to the holder, so that the length of the weft thread to be blown into the shed can be adjusted.
• the holder is provided with at least one blow opening, which is located in the region of a side wall facing the tissue.
• a blowing opening makes it possible, in addition to blowing onto the end of the weft thread, to direct one or more air jets onto the warp threads in order to prepare the edge of the shed formed from the warp threads for blowing in the end of a weft thread. It is advantageous if the at least one blowing opening located in the region of the side wall of the holder is provided in an insert which can be rotated to adjust the position of the blowing opening.
• the at least one insert which is provided with the at least one blowing opening for inserting the end of the weft thread into a shed, is assigned a drive which is preferably controlled by means of the machine control.
• the operator can adjust the insert on an input unit of a control unit after the operator has inspected the fabric edge formed by inserting the weft threads.
• the setting of the insert can also take place with the aid of data generated by a transmitter unit and passed on to the control unit, for example in dependence on an image of the inserted end of the weft thread captured by a camera.
• FIG. 1 shows a schematic plan view of an air jet weaving machine with a plurality of edge inserts according to the invention
• FIG. 2 is a perspective view in the direction of arrow F2 of FIG. 1 on an edge insert with a cutting device
• FIG. 3 is a partial side view in the direction of arrow F3 of FIG. 1 on an edge insert
• FIG. 7 is a view in the direction of arrow F7 of FIG. 3,
• FIG. 8 shows a section similar to FIG. 4 of a modified embodiment
• FIG. 9 shows a section similar to FIG. 4 of a further modified embodiment
• FIG. 10 shows a section similar to FIG. 6 through a further modified embodiment
• FIG. 11 is a view similar to FIG. 3 of a further embodiment
• FIG. 12 shows a section corresponding to FIG. 5 through the embodiment according to FIGS. 11 and
• FIG. 13 is a section along the line Xlll-Xlll of FIG. 11th
• a controllable cutting device 7, which is controlled by the control unit 6, is provided for each edge insert 1.
• a common cutting device 7 is provided for the two central edge inserts 1.
• the edge inserts 1 and the cutting devices 7 are slidably mounted on a strut 8 running transversely to the weaving direction.
• the air jet loom further contains a sley 9, which is provided with a plurality of main blowing nozzles 10 and a reed 11.
• the weft threads entered are attached to a stop edge 12 or 13 of the fabrics 2 and 3 by means of the reed 11.
• a shed is formed from warp threads 14 in each case by means of shed-forming elements (not shown).
• Each edge insert 1 is connected to a compressed air source via a valve which can be controlled by a control unit 6.
• the edge insert 1 shown in FIG. 2 has a holder 15 which is fastened to the strut 8 in a manner not shown by means of a support 16.
• the holder 15 is provided with a guide slot formed by guides 17 which widens in a V-shape against the stop direction and merges into a narrow slot which runs essentially parallel to the plane of the fabric.
• the guides 17 guide the weft thread in the holder 15.
• the guides 17 are provided with wear-resistant covers 18, for example covers made of ceramic or steel.
• a cutting device 7 is fastened to the holder 15.
• This cutting device 7 has a stationary shear blade 20 which is fastened with screws 22 to an intermediate element 21, which in turn is fastened with screws 23 to the holder 15.
• a movable shear blade 24 is connected to a lever 26 by means of a bolt 25.
• the lever 26 is fastened to the intermediate element 21 by means of a ball joint 27.
• the lever 26 is connected to a controllable drive motor 28 which is fastened to the support 16 via an intermediate element 29.
• a leaf spring 30 is arranged between the lever 26 and the movable shear blade 24 and presses the movable shear blade 24 against the stationary shear blade 20.
• the distance between the cutting device 7 and the holder 15 can be adjusted in the weft direction. Because of the ball joint 27, this can be carried out without the drive motor 28 being displaced. Adjustment can also take place by using an intermediate element 21 with a different thickness.
• the intermediate element 21 is provided with elongated holes 31 for the screws 23, so that the position of the cutting device 7 can also be adjusted transversely to the weft direction.
• the holder 15 is provided with means 32 for blowing the end of a weft thread into a shed.
• These means 32 contain a cylindrical insert 33 which can be rotatably arranged in the holder 15 and can be fixed in a predetermined angular position on the holder 15 by means of a fixing screw 34.
• the insert 33 has an axial channel 35 which is connected to a compressed air supply channel 36 of the holder 15 via radial bores 38.
• the axial channel 35 leads to blow openings 37 of the insert 33, which are located in the region of the guide slot of the holder (FIG. 6). The blow opening is directed essentially radially.
• the insert 33 has at least two opposite radial bores 38, so that the same insert 33 can be used for edge inserts 1 arranged on the right or left of a fabric.
• sealing rings 40, 41 are provided in the area above and below the radial bores 38.
• the end of the axial channel 35 facing away from the blowing opening 37 is closed by means of a sealing element 39.
• the upper end of the insert 33 protruding from the holder 15 is provided with a tool engagement surface, in the exemplary embodiment with a hexagon 42 on which the insert can be gripped and rotated.
• the insert 33 is provided with a pointer 43 which is assigned to a scale 44. The pointer 43 is rotated by 90 ° relative to the blow opening 37.
• the holder 15 is further provided with a pneumatic holding device 50 for the end of the weft thread.
• This holding device 50 has a channel, which is provided in the holder 15 and runs transversely to the firing direction and is made of a preferably wear-resistant material existing tube 45 is bordered.
• a blowing opening 46 is directed onto this tube 45.
• the insert 33 and the tube 45 are arranged in a common plane 51 which runs transversely to the weft direction.
• a valve system 4 FIG. 1
• compressed air is fed to the blow opening 46 via a compressed air supply channel 47 of the holder.
• the channel 47 extends through the receiving bore of the insert 33, which is provided with a cross-sectional reduction 48 in this area. The area of this reduction in cross section is sealed off from the outside by the sealing ring 41 and a further sealing ring 49.
• the edge insert 1 operates as described below with reference to FIG. 4.
• a weft 68 inserted into a shed is brought between the guide surfaces 17 of the holder 15 by means of the reed 11, so that the weft 68 is received in the holder 15. Due to the movement of the reed 11, the weft thread is guided up to the insert 33.
• the weft thread is then cut off by means of the cutting device 7 on the side wall 67 of the holder 15 facing away from the fabric 2 or 3. Compressed air is blown into the tube 45 by means of the blowing opening 46, so that the end of the weft thread 68 is blown into the tube 46 in accordance with the dashed illustration in FIG. 4.
• Compressed air is then fed to the blowing opening 37, which blows the end of the weft thread 68 into the subsequently formed shed. This blown-in end is then struck by the reed 11 together with the next weft thread on the stop edge 12, 13 of the fabric 2, 3.
• the insert 33 is provided with a wear-resistant cover 52, which prevents a weft thread from acting on the insert 33.
• a second insert 53 is provided in this embodiment, which is designed in accordance with the insert 33 and has a further blowing opening 54 in order to blow the end of a weft thread into a shed.
• the insert 33 is surrounded by a wear-resistant cover 55, which forms a nozzle-like flow channel 56, in order to guide the air flow emerging from the blow opening 37 of the insert 33.
• the angular position of this cover 55 can be adjusted according to the angular position of the insert 33.
• the pneumatic bracket is offset from the center plane 51 of the holder 15, i.e. the channel 45 is offset from the central plane in the direction of the side wall 67 of the holder 15 facing away from the tissue.
• the holder 15 is also not provided with a tube serving as an insert.
• the bore in the holder 15 is provided with a surface treatment to increase wear protection.
• the insert 33 is provided with two blowing openings 37, 57 arranged one above the other, which are directed towards the shed in the region of the guide slot.
• the blowing openings 37, 57 are directed in the same direction.
• the blowing openings 37, 57 are arranged offset to one another in the circumferential direction and blow out in different directions.
• more than two blowing openings 37, 57 are provided, which are arranged side by side and / or one above the other and which blow in the same and / or different directions.
• the boundary walls 58 of the guide slot in the region of the blowing openings 37, 57 are widened outwards by means of a bevel in order to prevent these limitations from interfering with the air flows.
• the insert 33 forms the rotor for a controlled drive motor 59.
• the angular position of the insert 33 and thus of the drive motor 59 is set with the aid of the control unit 6 (FIG. 1) of the air jet weaving machine.
• the drive motor 59 is for example wise designed as a stepper motor.
• an encoder 60 is also provided, which is used to determine the angular position of the insert 33 and which is connected to the control unit 6.
• the edge insert 1 is provided with further blowing openings 61, which open into the side wall 62 of the holder 15 facing the tissue.
• These blowing openings 61 blow air streams in the direction of the warp threads in order to make the shed suitable for blowing in the end of a weft thread.
• These blowing openings 61 can also help to blow an end of the weft thread 68 that has already been blown towards the shed further into the shed.
• the blow openings 61 are each provided in an insert 63 which is rotatably arranged in the holder 15. As can be seen from FIG.
• an oblique bore of the rotatable insert 63 serves as the blowing opening 61, so that not only the position of the blowing opening but also the direction of the blown-out air flow can be changed by rotating the insert 63.
• This setting can be carried out as a function of the fabric to be woven, and in particular as a function of the type of weft thread and / or the type of warp thread. So that the angular position of the insert 63 can be adjusted, it is screwed into a corresponding internal thread of the holder 15 with an external thread with a small pitch.
• the front end of the insert 63 is provided with a slot 64 so that the insert can be rotated with the aid of a tool.
• a securing element can be provided between the external thread of the insert 63 and the internal thread of the holder 15 in order to secure the insert 63 in the set angular position.
• the holder 15 is provided with elements 69 which have compressed air inlets 65 and which are connected to the valve 4 (FIG. 1) via supply lines 66 and a compressed air source for supplying compressed air to the blowing openings 61.
• the blowing openings 61 are connected to the compressed air supply channel 47, ie to the compressed air supply for the pneumatic holder.
• the guide surfaces 17 of the holder 15 are not provided with a wear-resistant cover 18.
• a surface treatment is preferably carried out.
• the invention is suitable for weaving with abrasive weft threads.
• the blowing direction of the air flow or the air flows can be set so that the end of the weft thread is parallel to the stop edge 12 or 13 and in this form the next weft thread is cast.
• Edge inserts of this type are also suitable for other weaving machines, such as rapier weaving machines, multi-phase weaving machines such as weaving rotors, rapier weft winding machines, water jet weaving machines, projectile weaving machines and other weaving machines.
• the holder 15 of the edge insert 1 can also have further blowing openings which can be designed as bores in the holder 15.
• the holder 15 can also have another holding device instead of the pneumatic holding devices 50.
• the weft threads can be held between the insert 33 and the cutting device 7, for example, by so-called last threads or by a mechanical weft thread clamp.
• the edge insert 1 offers the advantage that it can be adapted by means of a few adjustments, in particular by adding an or several valves 4 and a control unit 6, can be easily installed in existing weaving machines.
• Edge insert for a weaving machine for inserting an end of a weft into a shed with a holder (15) which is provided with means (32) for receiving the end of the weft inserted into a shed and for blowing the end into a subsequently formed shed
• the blowing means can be connected to a compressed air source (5) via valves (4) which can be controlled by a control unit (6), characterized in that the holder (15) is provided with at least one rotatably arranged insert (33, 53, 63) which can be connected to the compressed air source (5) and has at least one blown air opening (37, 54, 57, 61), the position of which is adjustable.
• Edge insert according to Claim 1 characterized in that the insert (33, 53) has an axial duct (35) which can be connected to a compressed air source (5) and at least one substantially radially directed blowing opening (37, 54, 57).
• Edge insert according to claim 1 or 2 characterized in that the holder (15) is provided with a guide slot for weft threads, and that the insert (s) (33, 53) are arranged in front of the end of the guide slot.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=3896516

Family Applications (1)

Country Status (7)

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Family Cites Families (8)

• 2000
  • 2000-05-08 BE BE2000/0311A patent/BE1013428A3/nl active
• 2001
  • 2001-05-05 EP EP01938177A patent/EP1280950B1/fr not_active Expired - Lifetime
  • 2001-05-05 AU AU2001263903A patent/AU2001263903A1/en not_active Abandoned
  • 2001-05-05 AT AT01938177T patent/ATE312218T1/de not_active IP Right Cessation
  • 2001-05-05 WO PCT/EP2001/005112 patent/WO2001086047A1/fr not_active Ceased
  • 2001-05-05 DE DE50108318T patent/DE50108318D1/de not_active Expired - Lifetime
  • 2001-05-05 US US10/258,619 patent/US6837279B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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