• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A weft insertion device of an air jet loom has a passage for the weft yarn which is disposed in an opening in the shed of warp yarns, a main nozzle for inserting the weft yarns. a weft thread in the weft passage, via an air jet, and a plurality of auxiliary nozzles which are disposed apart from each other along the weft passage and which carry downstream, via the air jets, the weft thread inserted. Said several auxiliary nozzles are distributed over several zones along the passage for the weft thread. The auxiliary nozzles in the downstream area along the weft passage are disposed at a spacing distance greater than the distance between the auxiliary nozzles in the upstream area along the weft passage.
    公开号:BE1019513A3
    申请号:E201000563
    申请日:2010-09-22
    公开日:2012-08-07
    发明作者:
    申请人:Toyota Jidoshokki Kk；
    IPC主号:
    专利说明:

    APPARATUS FOR INSERTING THE FRAME OF WEAVING WEAVING
    BY AIR JET
    BASIS OF THE INVENTION
    The present invention relates to a weft insertion apparatus of an air jet loom, wherein a weft yarn inserted into a shedding shed by a main nozzle is conveyed through the shed by auxiliary nozzles.
    Japanese Patent Application Publication H02-47335 discloses a method of inserting the weft to stabilize said insertion and also to improve the starting performance of the insertion in question by modifying the air jet pressure. , the flight speed of the weft yarn in the wing comb, and the time corresponding to the projection by the auxiliary nozzles between the side concerned by the insertion of the weft and the opposite remote side of the jet loom. of air to obtain a jet loom that works at high speed.
    Specifically, several auxiliary nozzles are distributed in two areas, one area being located on the weft insertion side and the other area being on the remote side. The pressure of the air jet or the rate of flight of the weft yarn into the comb of the auxiliary nozzle flap on the weft insertion side is set to be greater than that of the auxiliary nozzles on the far side. The time interval for insertion of the auxiliary nozzle frame on the weft insertion side is set to be shorter than that of the auxiliary nozzles on the remote side. The modification of the air jet pressures of the respective auxiliary nozzles of the two different zones is implemented by providing two separate air tanks for the respective zones so that the pressure of the air in the reservoir for air for the auxiliary nozzles on the weft insertion side is set to be high and the air pressure in the air tank for the auxiliary nozzles on the opposite remote side is set to be low, respectively.
    In the weft insertion apparatus according to the above-mentioned publication, the air jet pressure of the auxiliary nozzles on the remote side is set to be lower than that of the auxiliary nozzles on the insertion side of the frame. Therefore, the volume of air escaping from the auxiliary nozzles can be reduced compared to a case in which the air jet pressure is set to be high in all the auxiliary nozzles. However, when using a fine weft yarn or when the weaving operation is performed at a low speed, the air jet pressure of the auxiliary nozzles at the weft insertion side must be adjusted to be sufficiently weak to prevent breakage of the weft yarn. When the pressure of the air jet in the air tank for the auxiliary nozzles on the remote side is set to be lower than that in the air tank for the auxiliary nozzles on the side of the insertion of the frame in the weft insertion apparatus in accordance with the above-mentioned publication, the weft speed of the weft thread implemented by the air jets from the auxiliary nozzles on the far side further decreases, thereby difficult to guarantee the stability of the insertion of the weft thread.
    The object of the present invention is to provide an apparatus for inserting the weft of an air jet loom, in which the stability of the insertion of the weft is guaranteed and the volume of air which Escape from auxiliary nozzles can be reduced.
    SUMMARY OF THE INVENTION
    A weft insertion device of an air jet loom has a passage for the weft yarn which is disposed in an opening of the shed of the warp yarns, a main nozzle for inserting a weft yarn in the passage for the weft yarn and a plurality of auxiliary nozzles which are arranged apart from each other along the passage for the weft thread and which transport, via the air jets, the weft yarn inserted, downstream. Said plurality of auxiliary nozzles are distributed in several zones along the passage for the weft thread. The auxiliary nozzles in the downstream zone along the passage for the weft yarn are disposed at a spacing distance greater than the spacing distance of the auxiliary nozzles in the upstream zone along the passage for the weft yarn.
    Other aspects and advantages of the invention will become apparent from the following description when taken in conjunction with the accompanying drawings illustrating by way of example the principles of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The features of the present invention which are considered novel are specifically indicated in the appended claims. The invention together with its objects and advantages can be best understood by reference to the following description of the presently preferred embodiments in conjunction with the accompanying drawings, in which: FIG. principle in which there is shown a weft insertion apparatus according to a first embodiment; Figure 2 is a schematic view showing an arrangement of auxiliary nozzles of the insertion apparatus of the frame of Figure 1; FIG. 3 is a graph showing the relationship between the rotational speed of the air jet loom and the volume of air escaping from the auxiliary nozzles in the weft insertion apparatus. according to the first embodiment; Fig. 4 is a schematic view showing an arrangement of the auxiliary nozzles of a weft insertion apparatus according to a second embodiment; and Fig. 5 is a schematic view showing an arrangement of the auxiliary nozzles of a weft insertion apparatus according to a second embodiment.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
    Hereinafter, the first embodiment will be described with reference to Figs. 1 to 3. Referring to Fig. 1, a weft yarn Y is passed through a weft feeder (no shown), which yarn is pulled through a weft yarn length measuring device (not shown) by a tandem nozzle 1 before being inserted into a passage for the weft yarn which is disposed in an open shed chain yarn (not shown) via a main nozzle 2. The Y weft thread thus inserted by the main nozzle 2 receives assistance, during its flight, air jets that escape from several auxiliary nozzles 3A at 3F (only the nozzles 3A and 3F being shown) which are disposed apart from each other along the passage for the weft yarn. The insertion of the weft yarn ends when the latter has reached a predetermined position beyond the end of a woven fabric which is disposed opposite the other end of the woven fabric in an adjacent position. at the main nozzle 2. A weft yarn probe 4 detects the leading end of a weft yarn whose insertion has been successful.
    An air supply 5 is connected to a main tank 8 and an auxiliary tank 10 through regulators 7 and 9, via flexible hoses for air 6. The regulators 7, 9 are manually operated and used to adjust the air pressures prevailing in the main tank 8 and in the tank 10, respectively. The main tank 8 is connected to the nozzle in tandem through a flow control valve 11 and through a directional wave 12 and also towards the main nozzle 2 through a directional valve 13 through the flexible hoses for the water. air 6, respectively.
    The auxiliary nozzles 3A to 3F form respective separate groups each composed of a plurality of auxiliary nozzles. Each of these groups of auxiliary nozzles 3A, 3B, 3C which are arranged closer to the main nozzle 2 (or the upstream side when looking in the insertion direction of the frame) consists of four auxiliary nozzles. For example, the auxiliary nozzles 3A are connected to a directional valve 14A and via the respective air hose 6, so that air escapes from the four auxiliary nozzles 3A simultaneously when the directional valve 14A is opened. Each of the auxiliary nozzle groups 3D, 3E, 3F located opposite the main nozzle 2 (the downstream side in the insertion direction of the frame) consists of three auxiliary nozzles. For example, the auxiliary nozzles 3F are connected to a directional valve 14F via the respective air hose 6. The directional valves 14A to 14F are connected to the auxiliary tank 10 by the air hoses 6, respectively.
    There is provided a setting device which includes a setting device 15 for inserting the weft and a main adjusting device 16. The setting device 15 for inserting the weft adjusts and controls the operation of the directional valves 12, 13 and the flow control valve 11 via a signal routing circuit 17 and also controls and regulates the operation of the directional valves 14A to 14F via a signal routing circuit 18. In accordance with the control signals / setting issued by the adjustment device 15 of the weft insertion, the directional valves 14A to 14F are actuated to open the auxiliary nozzles 3A to 3F to project air jets in a relayed manner so that jets from the respective auxiliary nozzles 3A to 3F act on the leading end of the weft yarn during flight of the weft yarn into the passage for the weft yarn (not shown). The main adjusting device 16 is connected to the weft probe 4 via a signal routing circuit 19 to evaluate whether or not the insertion of the weft has been successful, depending on the presence. of a weft yarn detection signal by the weft yarn probe 4. The main adjusting device 16 also controls and controls the operation of the loom.
    The frame insertion adjustment device 15 and the main adjustment device 16 are connected to each other via a signal routing circuit 20 to establish communication with each other, thereby sending a signal setting or control to stop inserting the next frame when a frame insertion failure is detected and also for the synchronous setting. A control panel 21 having data input and display functions is connected to the frame insertion adjusting device 15 and the main setting device 16 via signal routing circuits for sending the data. inputs also for receiving and displaying memory data of the setting device 15 for inserting the frame and the main adjusting device 16.
    Hereinafter, an arrangement of the auxiliary nozzles 3A to 3F is described with reference to Fig. 2. In the present embodiment, the width of the loom in the drawing is divided into two substantially equal areas A1, A2. The area A1 extends a predetermined distance from the main nozzle 2 to the center of the width of the drawing, which corresponds to the upstream side of the width of the drawing when looking in the direction of insertion of the frame. The area Al also corresponds to the first divided area when viewed from the main nozzle 2. The divided zone A2 extends over the same predetermined distance which corresponds to the downstream side of the width of the drawing when viewed in the insertion direction of the frame. A plurality of auxiliary nozzles 3A-3C are disposed at a predetermined spacing distance PI in the area A1 which is disposed in the upstream side in the insertion direction of the weft. The auxiliary nozzles 3A consist of a set of four auxiliary nozzles which are connected to a common directional valve 14A via flexible hoses for air 6. Similarly, the auxiliary nozzles 3B, 3C consist of sets of four nozzles auxiliaries which are connected to common directional valves 14B, 14C via air hoses 6, respectively. Thus, three groups of auxiliary nozzles 3A to 3C are provided in zone A1. Directional valves 14A to 14C are connected to auxiliary tank 10 via flexible hoses for air 6.
    The air pressure prevailing in the auxiliary tank 10 and the volume of the air escaping from the auxiliary nozzles 3A to 3C which are arranged at the spacing distance PI are adjusted so as to guarantee a sufficient speed in flight weft yarn and a stability of the insertion operation of the weft. Specifically, the timing of the arrival when the weft yarn inserted Y reaches the end of the passage for the weft yarn, which is opposed to the main nozzle 2, is predetermined based on the width of the drawing. and on the rotational speed of the jet loom. Therefore, the air pressure prevailing in the auxiliary tank 10 and the volume of the air escaping from the auxiliary nozzles 3A to 3C are adjusted so as to guarantee a flight speed of the weft thread which allows the setting of the chosen timing that has been determined for the arrival of weft yarn Y as mentioned above, as well as a stability of the flight of weft yarn Y which is subjected to an acceleration in the passage for the weft yarn .
    The 3D auxiliary nozzles in the downstream zone A2 are arranged at a spacing distance P2 which is greater than the distance PI of the auxiliary nozzles 3A to 3C in the upstream zone A1. With respect to the number of auxiliary nozzles 3A to 3C in the zone Al upstream, the number of 3D auxiliary nozzles in the A2 area is lower. Specifically, three auxiliary nozzles per group are used, which is connected to a common directional valve 14D via flexible hoses for air 6. Similarly, the auxiliary nozzles 3E, 3F consist of three auxiliary nozzles and are connected to the directional valves 14E, 14F via air hoses 6, respectively. The directional valves 14D, 14E, 14F are connected to the auxiliary tank 10 via flexible hoses for the air 6.
    The flight speed of the weft yarn Y is already stabilized in the downstream zone A2, so that the spacing distance P2 of the auxiliary nozzles in the downstream zone A2 need not necessarily be set to be as small as the distance from PI spacing of the auxiliary nozzles in the upstream zone A1 so as to guarantee stability in flight of the weft yarn Y. Although the pressure of the air escaping from the 3D auxiliary nozzles at 3F in the downstream zone A2 is equal to that of the air escaping from the auxiliary nozzles 3A to 3C in the upstream zone Al, the volume of air to be consumed in the downstream zone A2 is reduced compared to that of the air to be consumed in the upstream zone Al in that the spacing distance P2 is increased and the number of auxiliary nozzles used in each of the groups of the auxiliary nozzles 3D to 3F is reduced, as long as the guarantee is guaranteed. stability in flight of the weft yarn Y during insertion of the weft.
    Hereinafter, the operation of the weft insertion apparatus will be described in accordance with the first embodiment. During the weaving operation of the air jet loom, a weft yarn Y is inserted into the passage for the weft yarn (not shown) in an open shed of warp yarn via the air which from the main nozzle 2. The flight of the weft yarn Y is supported by a relatively large volume of air which successively escapes from the auxiliary nozzles 3A to 3C in the upstream zone Al which is arranged at a short distance from PI distance. Therefore, while the weft yarn Y continues to fly in the upstream zone Al, the flight speed of the weft yarn Y increases and the flight stability of the weft yarn Y, which is thus subject to acceleration, is guaranteed. by the relatively small distance PI distance of the auxiliary nozzles. While the weft yarn Y is flown in the downstream zone A2, the flight of the weft yarn Y is supported by a relatively small volume of air which successively escapes from the upstream side of the 3D auxiliary nozzles at 3F which are spaced on the distance P2 which is greater than the distance PI. While the weft yarn Y is flying in the area A2, the speed of the weft yarn Y is not decelerated and its stability in flight is guaranteed until the completion of the insertion of the weft. Therefore, it is possible to remarkably reduce the volume of air that is consumed by all the auxiliary nozzles 3A to 3F which are arranged along the passage for the weft yarn.
    The rotational speed of the air jet loom can be adjusted over a wide range of speeds by taking into account various types of woven fabric and improving productivity. Referring to FIG. 3, the dotted line XI represents the volume of air consumed when the auxiliary nozzles are disposed at a constant spacing distance throughout the passage for the weft yarn. The solid line X2 represents the volume of air consumed in the present embodiment, in which the auxiliary nozzles 3 are arranged at different spacings PI and P2 (P2> PI) in the upstream and downstream zones A1, A2 along the passage for the weft yarn, respectively. As can be seen from the graph of FIG. 3, the reduction of the air volume increases proportionally with the increase in the rotation speed of the loom, but the reduction rate is practically constant at no. any speed of the loom. Thus, the weft insertion apparatus according to the first embodiment shows a good result in reducing the volume of air consumption at any rotational speed of the jet weaving machine. air.
    The weft insertion apparatus according to the first embodiment has the following advantageous effects: (1) by arranging the 3D auxiliary nozzles at 3F in the downstream zone A2 at a spacing distance P2 which is greater at the spacing distance PI for the auxiliary nozzles 3A to 3C in the upstream zone A1, it is possible to remarkably reduce the air consumption by the set of auxiliary nozzles 3A to 3F; (2) increasing the spacing distance P2 for the 3D auxiliary nozzles to 3F can be easily accomplished by reducing the number of auxiliary nozzles to be used in each group of said auxiliary nozzles. Therefore, the mounting of the auxiliary nozzles can be achieved easily; (3) the weft insertion apparatus according to the first embodiment is economical since a small number of auxiliary nozzles are used; (4) when using a thin or weak weft yarn for weft insertion, the appropriate air pressure and air volume for such a weft yarn can only be adjusted by adjusting the weights auxiliary nozzles 3A to 3C upstream. Since the air pressure of the 3D downstream 3F auxiliary nozzles must not be reduced to be less than that of the auxiliary nozzles 3A to 3C upstream, the insertion apparatus in the weft according to the first form embodiment makes it possible to reduce the volume of air consumed by the auxiliary nozzles by increasing the spacing distance P2 of the auxiliary nozzles 3D to 3F downstream, while guaranteeing the stability in flight of the weft yarn Y during the insertion of the frame.
    In the weft insertion apparatus in accordance with the second embodiment shown in FIG. 4, the number of subdivided areas over the width of the drawing of the apparatus is changed. insertion of the frame according to the first embodiment. In the following description, the same reference numerals will be used for common elements or components found in the first and second embodiments and the description of such elements or components will be omitted. In the second embodiment, the width of the drawing is divided into three essentially equal areas A1, A2 and A3 in this order, when viewed from the main nozzle 2.
    In the first zone A1 located on the upstream side, a plurality of auxiliary nozzles 3A, 3B are arranged along the passage for the weft yarn at the spacing distance PI which is used in the weft insertion apparatus in accordance with the first embodiment. The auxiliary nozzles 3A in the upstream zone Al consist of four auxiliary nozzles connected to a common directional valve 14A via flexible hoses for the air 6. Similarly, the auxiliary nozzles 3B consist of four auxiliary nozzles connected to a valve 14B directional valves 14A, 14B are connected to the common auxiliary tank 10 via flexible hoses for air 6. The volume of air escaping from the auxiliary nozzles upstream 3A, 3B which are arranged along the bore for the weft yarn at the spacing distance PI and the pressure of the air in the auxiliary reservoir 10 are both set to ensure a sufficient speed of the flight of the weft yarn which makes it possible to implement the aforementioned determined chosen movement for the arrival of the weft yarn Y and also the flight stability of the weft yarn Y is subjected to an acceleration in the passag e for the weft yarn, as is the case for the weft insertion apparatus according to the first embodiment.
    Several 3D auxiliary nozzles, 3E are arranged along the passage for the weft yarn in the intermediate zone A2 downstream of the zone A1 at the spacing distance P2 which is greater than the distance P1, as is the case for the weft insertion apparatus according to the first embodiment. The 3D auxiliary nozzles in the intermediate zone A2 consist of three auxiliary nozzles 3 which are connected to a common directional valve 14D via flexible hoses for the air 6. Similarly, the auxiliary nozzles 3E consist of three auxiliary nozzles which are connected to a common directional valve 14E via flexible hoses for air 6.
    Several auxiliary nozzles 3G, 3H are arranged along the passage for the weft yarn in the zone A3 downstream of the intermediate zone A2 at a spacing distance P3 which is greater than the distance P2. The auxiliary nozzles 3G in the intermediate zone A3 consist of two auxiliary nozzles 3 which are connected to a common directional valve 14G via flexible hoses for the air 6. Similarly, the auxiliary nozzles 3H consist of two auxiliary nozzles which are connected to a common directional valve 14H via flexible hoses for air 6. The directional valves 14D, 14E, 14G, 14H are connected to the common auxiliary tank 10 via flexible hoses for air 6.
    In the second embodiment, the spacings PI, P2 and P3 for the auxiliary nozzles 3A, 3B, the auxiliary nozzles 3D, 3E and the auxiliary nozzles 3G, 3H, respectively, are larger and larger. Therefore, the reduction of the air consumption volume can be further amplified while guaranteeing the flight stability of the weft yarn Y. By adjusting the spacing distance P3 in the downstream zone A3 to the spacing distance P2 in the first embodiment and also the spacing distance P2 in the intermediate zone A2 at a distance which lies between the spacing distances in the upstream zone A1 and in the downstream zone A2, it is possible to prevent any fluctuation movement of the Y-weft yarn in the boundary zone between any two adjacent zones, since the difference in the spacing distance between the adjacent zones is further reduced, when compared to the case of the first embodiment.
    The weft insertion apparatus according to the third embodiment shown in FIG. 5 differs from that of the first embodiment in that two auxiliary tanks are provided. In the following description, the same reference numerals will be used for common elements or for components found in the first and third embodiments and the description of such elements or components will be omitted. As mentioned above, the weft insertion apparatus according to the third embodiment has first and second auxiliary tanks 10A, 10B. The first and second auxiliary tanks 10A, 10B for the auxiliary nozzles 3A to 3C in the upstream zone A1 and for the 3D auxiliary nozzles to 3F in the downstream zone A2, respectively, are connected to the common air supply 5 via hand-operated regulators 9A, 9B passing through air hoses 6, respectively. The first and second auxiliary tanks 10A, 10B correspond to a first and a second tank, respectively.
    The auxiliary nozzles 3A, 3B, 3C disposed in the upstream zone A1 at the constant spacing distance PI are connected to the first common auxiliary tank 10A via the directional valves 14A, 14B, 14C, respectively. Similarly, the auxiliary nozzles 3D, 3E, 3F arranged in the upstream zone A2 at the constant spacing distance P2 which is greater than the spacing distance PI are connected to the second common auxiliary tank 10B via the directional valves 14D, 14E, 14F, respectively.
    By adjusting the pressure of the air prevailing in the second auxiliary tank 10B to obtain a pressure lower than the air pressure prevailing in the first auxiliary tank 10A during the abnormal operation of inserting the weft, it is possible to further amplifying the reduction in the volume of air consumed in the downstream region A2 when compared to the case of the first embodiment. However, when the air pressure prevailing in the first auxiliary tank 10A is set so as to obtain a low pressure for the insertion of a thin weft thread or when the loom is operated at a low speed. rotation, it is not to be feared not to obtain the desired speed in flight of the weft yarn Y in the downstream zone A2 when the air pressure prevailing in the second auxiliary tank 10B is set so as to obtain a pressure lower than that of the air prevailing in the first auxiliary tank 10A. In such cases, the air pressure prevailing in the second auxiliary tank 10B will preferably be substantially equal to the air pressure prevailing in the first auxiliary tank 10A to ensure the desired flight speed of the weft yarn Y in zone A2.
    The present invention is not limited to the embodiments indicated above, it may be modified in various ways as illustrated below by way of example.
    (1) The lengths of the areas A1, A2, A3 along the passage for the weft yarn are essentially equal in the first and the second embodiment, but the areas A1, A2, A3 may have different lengths.
    (2) The number of zones obtained by subdivision is not limited to two or three; it may be four or more.
    (3) The same spacing distance is used for auxiliary nozzles provided in the same zone in the embodiments indicated above. However, said distance may be subject to changes within the same area.
    (4) The first and second auxiliary tanks 10A, 10B in the third embodiment are provided separately. However, only one auxiliary tank can be used which is shared between two spaces.
    权利要求:
    Claims (6)
    [1]
    An insertion device for the weft of an air jet loom, comprising: a passage for the weft yarn which is disposed in an opening of the shed of the warp yarns; a main nozzle (2) for inserting a weft yarn into the passage for the weft yarn via an air jet; and a plurality of auxiliary nozzles (3A to 3H) which are disposed apart from each other along the passage for the weft yarn and which convey downstream, via the air jets, the yarn inserted weft, characterized in that said plurality of auxiliary nozzles are divided into a plurality of zones (A1, A2, A3) along the passage for the weft yarn, the auxiliary nozzles in the downstream zone along the passage for the weft yarn being disposed at a spacing distance which is greater than the spacing distance of the auxiliary nozzles in the upstream zone along the passage for the weft yarn.
    [2]
    2. Device for inserting the weft of an air jet loom according to claim 1, characterized in that the number of zones is three or more, the spacing distances for the auxiliary nozzles of each zone along the passage for the weft yarn being greater than the spacing distances for the auxiliary nozzles of the adjacent upstream zone along the passage for the weft yarn.
    [3]
    3. Device for inserting the weft of an air jet loom according to any one of claims 1 to 2, characterized in that the lengths of the zones along the passage for the weft thread are equal .
    [4]
    4. Device for inserting the weft of an air jet loom according to any one of claims 1 to 3, characterized in that the spacing distances for the auxiliary nozzles in the same zone are equal .
    [5]
    5. Device for inserting the weft of an air jet loom according to any one of claims 1 to 4, characterized in that the auxiliary nozzles in each zone form separate groups which consist of several auxiliary nozzles and the number of auxiliary nozzles used in each of the auxiliary nozzle groups in the downstream zone is less than that of the auxiliary nozzles used in each of the auxiliary nozzle groups in the upstream zone.
    [6]
    6. Apparatus for inserting the weft of an air jet loom according to any one of claims 1 to 5, characterized in that the insertion device of the frame further comprises: a first reservoir (10A) connected to the auxiliary nozzles in the upstream zone along the passage for the weft yarn; and a second reservoir (10B) connected to the auxiliary nozzles in the downstream zone along the passage for the weft yarn, the pressure of the air in the first reservoir being set to be greater than that of the air pressure prevailing in the second tank.
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    同族专利:
    公开号 | 公开日
    ITTO20100769A1|2011-03-24|
    CN102031620B|2012-10-10|
    IT1402655B1|2013-09-13|
    JP2011069000A|2011-04-07|
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    CN104862865A|2014-02-21|2015-08-26|江南大学|Novel auxiliary jet spacing design applicable to bidirectional weft insertion|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009218312A|JP5493639B2|2009-09-23|2009-09-23|Weft insertion device in air jet loom|
    JP2009218312|2009-09-23|
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