JP2008144336A - Method and apparatus for insertion of weft threads - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus 1 for the insertion of weft threads for a weaving machine. <P>SOLUTION: The apparatus 1 includes a nozzle holder 9 and, secured thereto, at least one nozzle 3 with a mixing tube 6 for the insertion of a weft thread 2 as well as a clamping device 7 which can be charged with a medium in order to firmly clamp a weft thread which is introduced into the nozzle. In addition, the apparatus 1 contains at least one control valve which is arranged at or in the nozzle holder 9 or the nozzle 3 in order to control the clamping device 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The invention comprises an apparatus for inserting a weft for a loom according to the premise of claim 1, a method for inserting a weft for a loom according to the premise of claim 8, and an apparatus of this kind. The invention relates to a loom for carrying out this type of method.

  German Patent Publication DE 3200638 describes an air-jet loom including a nozzle with a blended cotton tube for inserting a weft thread and a lead (cage) for pressing the weft thread. In order to firmly clamp the weft yarn during cutting or while the loom is stationary, and thereby to prevent the weft yarn from bouncing back into the nozzle, a yarn clamp is arranged in the blending tube of the nozzle. This configuration of the yarn clamp allows the blending in the weft guide passage formed in the lead so that the variation in the preferred position of the weft yarn between the blending tube and the weft guide passage can be kept small during insertion. Allows the tubes to be placed close together.

  The specification of WO02095105 discloses in FIG. 5 and FIG. 6 thereof an apparatus for inserting a weft for a loom comprising a plurality of nozzles each provided with a blended cotton tube. The nozzles are each equipped with a clamping device 1A, which is connected to a control valve 17 via a line 15 to provide compressed air or vacuum to the clamping device. The control valve 17 is activated by the control system 20.

  In prior art weft insertion devices, the weft thread is forced into the individual nozzles after insertion by a holding air flow in normal operation to prevent the weft thread from bouncing back into the nozzle. Retained. On the other hand, when the loom is stopped, the weft is held strongly by the clamping device arranged in the mixed cotton pipe of the nozzle, and when the loom is stopped for a long time, the weft is caused by the air flow for holding. Since there is a risk of damage, the air flow for holding is interrupted. However, this clamping device complicates the threading of individual weft yarns into the associated nozzles, because for threading, the clamping devices must be individually opened via the loom control system. It has a drawback. In addition to one control valve per clamping device, a supply line for compressed air is required, so that individual control of the clamping device leads to increased cost and complexity.

  The object of the present invention is to utilize an apparatus for inserting a weft thread for a loom and a method for simplifying threading the weft thread in a nozzle, which is less costly and complicated than a conventional apparatus. Is to be able to do it. A further object of the invention is to make available a loom comprising such a device for inserting a weft thread, or a loom for carrying out such a method.

  According to the invention, this object is defined by an apparatus for inserting a weft thread as defined in claim 1 and by a method for inserting a weft thread as defined in claim 8 as well as in claim 10. Achieved with a loom.

  An apparatus for inserting a weft for a loom according to the invention comprises at least one nozzle comprising a nozzle holder, a blended cotton tube for inserting a weft fixed to the nozzle holder, and a weft introduced into the nozzle. In order to clamp firmly, the medium can be supplied and includes at least one clamping device arranged in the region of the nozzle. Furthermore, the apparatus is arranged at or in a nozzle holder or nozzle or clamping device and is connected to the clamping device to control the supply to the clamping device. Includes control valve.

  In certain preferred embodiments, the at least one control valve is further connected to at least one nozzle for feeding media to the nozzle for threading the weft. In a preferred variant, the supply to both the at least one nozzle and the at least one clamping device is at least one to switch between the supply to the nozzle for threading and the strong clamp of the weft thread. It can be controlled using a control valve. The at least one control valve is preferably formed as a manually operated control valve.

  In a further preferred embodiment, the apparatus comprises a plurality of nozzles, each nozzle being equipped with a clamping device and a control valve located at or in the nozzle holder or nozzle. The apparatus preferably includes a common supply line for supplying the apparatus with media used for supplying to the clamping device and / or for threading.

  In a further preferred embodiment, the connection between the at least one control valve and the at least one clamping device is formed inside the nozzle holder and / or inside the at least one nozzle or clamping device.

  The invention further includes a method for inserting a weft for a loom using an apparatus comprising a nozzle holder and at least one nozzle with a blended cotton tube secured thereto. In this method, at least one nozzle is supplied with a medium for threading the weft and the weft is introduced. The weft thread introduced into the nozzle is firmly clamped using at least one clamping device to which the medium is supplied for that purpose. The weft clamp is released prior to insertion and the weft is inserted using a nozzle. In addition, the supply to the nozzle for threading and the supply to the clamping device for strong clamping are arranged in or in the nozzle holder, or nozzle or clamping device in this way. Controlled by at least one control valve.

  In a preferred variant, at least one control valve is used to switch between the supply to at least one nozzle for threading and a tight clamp of the weft.

  The present invention further includes a loom comprising an apparatus equipped for inserting a weft thread and / or for carrying out the above method according to any one of the above embodiments.

  An apparatus according to the invention for inserting a weft thread, and a method according to the invention, wherein the threading of the weft thread is simplified, for example during threading, by means of a control valve attached to the nozzle holder or nozzle or clamping device. It has the advantage that the control valve can be activated manually. A further advantage is that if the device has a plurality of nozzles, the media used for the supply to the clamping device and / or for threading is supplied to the device via a single supply line. Be able to.

  The above description of the embodiments is merely an example. Further advantageous embodiments are provided by the dependent claims and the drawings. Furthermore, in the context of the present invention, the individual features of the embodiments described or illustrated and their variations are combined with one another to form new embodiments.

  In the following, the invention will be described in more detail by means of examples with reference to the drawings.

  Referring to the prior art air jet loom shown in FIG. 1, a yarn container 21 for supplying a weft yarn 2, a plurality of air nozzles 3, 4, 5.1, 5.2, and a control valve 13 , 14, 15.1 and a supply pipe 13 for connecting a control valve for supplying a medium such as compressed air to the air nozzle for inserting a weft thread to the corresponding air nozzle, 14 and so on. The air nozzle is, for example, a tandem nozzle 4 and a main nozzle 3 for accelerating the weft 2 drawn from the yarn container 21 and blowing it into the path, and a relay for further transporting the weft in the path. And nozzles 5.1 and 5.2. Instead of the main nozzle and the tandem nozzles 3, 4, it is also possible to have only a single main nozzle 3 for accelerating the weft yarn, depending on the application, many to accelerate and insert different weft yarns 2 The main nozzle 3 is provided, and the color, fineness, texture, and material can be made different. The illustrated loom further includes a lead 18 for pressing the inserted weft yarn and at least one cutting device 17 for cutting the weft yarn. The main nozzle 3, the relay nozzles 5.1, 5.2 and the lead 18 can be fixed to a common sley.

  FIG. 2A shows a perspective view of an embodiment of the device 1 for inserting a weft thread according to the invention. This device is introduced into the nozzle with at least one nozzle 3.1, 3.4 comprising a nozzle holder 9 and a blending tube 6.1-6.4 for inserting a weft fixed to it. A medium for firmly clamping the weft yarn can be supplied and includes at least one clamping device 7.1 to 7.3 arranged in the region of the nozzle. In the embodiment shown in FIG. 2A, this device comprises four nozzles 3.1 to 3.4, each comprising a blended cotton tube 6.1 to 6.4, and a fourth, hidden by a nozzle holder 9. A clamping device 7.1-7.3 comprising a clamping device. The number of nozzles in this device can be chosen freely in a wide range, for example so that the device can comprise one, two, three, four, five, six or more nozzles. Can do. The apparatus according to the invention is arranged in or in the nozzle holder 9 or nozzles 3.1 to 3.4 or clamping devices 7.1 to 7.3 and controls the supply of the media to the clamping device In order to do so, it also includes at least one control valve connected to the clamping device 7.1-7.3. In the embodiment shown, the device 1 includes a control valve arranged in the nozzle holder 9 for each of the four nozzles 3.1 to 3.4. For these four control valves, only the two control valve activation buttons or keys 8.1a, 8.2a can be seen in FIG. 2A.

  In one variant, openings 13.1b to 13.3b for inserting, for example, screw connections in the supply pipe are provided in the nozzle holder so that the medium for accelerating the weft insertion can be supplied to the nozzle. Or it is provided in the nozzle.

  In one advantageous embodiment, the device according to the invention comprises a plurality of nozzles 3.1 to 3.4, each comprising a clamping device 7.1 to 7.3, a control valve for each nozzle, and this clamping A common supply line 8b for allowing the medium used to supply the device to be supplied to the apparatus.

  In a further advantageous embodiment, the connection between the at least one control valve and the at least one clamping device is provided inside the nozzle holder 9 and / or at least one nozzle 3.1 to 3.4 and / or Alternatively, it is formed inside the clamping device 7.1 to 7.3.

  FIG. 2B shows a perspective view of the embodiment of FIG. 2A from another angle. In the illustrated embodiment, the apparatus 1 comprises a nozzle holder 9 and four nozzles 3.1 to 3.4 inserted therein, each having a blended cotton tube 6.1 to 6.4, and a nozzle holder. 9 includes a clamping device 7.1 to 7.3 in which the fourth clamping device is hidden, for firmly clamping the weft thread introduced into the respective nozzle. The device 1 further includes a control valve for each of the four nozzles 3.1 to 3.4 arranged in the nozzle holder 9. In FIG. 2A, only the activation buttons 8.1a to 8.4a of the four control valves can be seen. In one variant, openings 13.1b to 13.3b are provided in the nozzle holder 9 in order to be able to supply the nozzle with a medium for accelerating the weft insertion.

  FIG. 3A schematically shows a second embodiment of the device according to the invention with the weft thread firmly clamped. In the illustrated embodiment, the device 1 comprises a nozzle holder 9, a nozzle 3 fixed to it with a blended cotton tube 6 for inserting a weft thread 2, a medium can be fed, and the area of the nozzle And a clamping device 7 disposed therein. In FIG. 3A, the nozzle and clamping device are shown in cross-section so that their configuration can be seen. The clamping device 7 can include an illustration. The clamping device can further include a reset spring that resets the piston.

  The device 1 of the second embodiment is further arranged in or in the nozzle holder 9, or the nozzle 3, or the clamping device 7, and in this case called an internal control valve, for example It includes a control valve 8 which can be activated by a manual button 8a, for example a so-called 2 / 2-way valve, as shown in FIG. 3A. In the illustrated embodiment, the internal control valve 8 has a fixed or adjustable throttle element 8.1c in its interior so that it can limit the amount of medium flowing through it if necessary. Connected to the input side of the clamping device 7 of the device 1 and to the supply pipe 8.1b. As shown in FIG. 3A, when the internal control valve 8 is closed, the clamping device applies the full pressure of the medium in the supply line 8.1b, and the weft 2 is firmly clamped.

  In one advantageous variant, the device according to the invention is further referred to below as an external control valve, for example by a control system of a loom to apply pressure to the supply line 8.1b or to depressurize it. It includes at least one further control valve 12, which can be controlled, for example a 3 / 2-way valve. While the loom is stationary, the supply line 8.1b, and thus the clamping device 7, can be pressurized via an external control valve 12 to clamp the weft 2 firmly, while the loom is in operation. And / or during insertion of the weft thread, the supply line 8.1b can be depressurized via the external control valve 12 so that the weft thread clamp can be released. If necessary, the supply piping of multiple devices can be connected to the output of the external control valve 12 to control multiple weft thread clamps through the same control valve.

  In one advantageous variant, an internal control valve 8 arranged in or in the nozzle holder 9, or nozzle 3, or clamping device 7 is supplied with a medium for weft threading. And connected to the output side of the nozzle 3. FIG. 3B shows a schematic view of this type of embodiment when threading a weft thread. As already described in the discussion of FIG. 3A, the internal control valve 8 is connected to the input side of the clamping device 7 of the device 1 and to the supply pipe 8.1b. When this internal control valve 8 and, if necessary, the external control valve 12 are open, as shown in FIG. 3B, for example, the throttle element 8.1c shown in the supply pipe Due to the flow restriction, the nozzle 3 is filled with the medium supplied via the supply pipe 8.1b whose flow amount is limited. As a result of the flow restriction in the supply line, the pressure of the medium with which the clamping device 7 is filled drops to such an extent that the clamping device is released, freeing the path of the weft 2. The weft thread can then be introduced into the nozzle 3 with the aid of a medium supplied for threading.

  In a further advantageous embodiment, the apparatus 1 comprises a plurality of nozzles 3, each nozzle having a clamping device 7, a nozzle holder 9, or a nozzle 3, or a clamping device 7, or in them. An internal control valve 8 is provided. This apparatus advantageously includes a common supply line 8b so that the medium used to fill and / or thread the clamping device can be supplied to the apparatus. FIG. 3B shows a common supply line 8b of this kind connected to the individual supply lines 8.1b to 8.4b so that the medium can be supplied to the respective internal control valve 8 and the clamping device 7. Show. The throttle elements 8.1c to 8.4c that limit the amount of flow through are inserted into the individual supply pipes 8.1b to 8.4b as described in the discussion of FIG. 3B. Thanks to this throttling element, when one of the internal control valves is open, the pressure of the medium in the common supply line 8b is such that only the clamping device belonging to the open associated control valve is released. However, the other clamping device maintains its weft thread clamp. Normally, only one weft thread is threaded at a time or threaded individually, and only one control valve is released at a time, so the number of nozzles in the device 1 is not critical.

  In one advantageous variant, hereinafter referred to as an external control valve, it can be controlled, for example by a loom, for example in a 3/2 direction, to apply pressure to the common supply line 8b or to depressurize it. Another control valve 12, which is a valve, is provided. While the loom is stationary, the supply line 8b can be pressurized via an external control valve 12 to clamp the associated weft 2 firmly. On the other hand, during operation of the loom and / or during insertion of the weft, the supply line 8b can be depressurized via the external control valve 12 to release the weft clamp.

  In one advantageous variant, the connection between the common supply line 8b and the individual supply lines 8.1b to 8.4b and / or the individual supply lines 8.1b to 8.4b and / or the throttle element. Connections to 8.1c to 8.4c and / or to the internal control valve 8 and / or to the clamping device 7 and / or to the nozzle 3, for example as a bore, of the nozzle holder 9, And / or formed in the nozzle 3 and / or inside the clamping device 7. In a further advantageous variant, the internal control valve and in some cases the throttle element are integrated in the nozzle holder 9 and / or the nozzle 3 and / or the clamping device 7. The arrangement of the common supply line of the media and the individual supply lines inside the nozzle holder and / or nozzle for the weft threading and / or the strong clamping of the wefts saves on the production of the device. Allows to be made.

  FIG. 4A shows a schematic view of a third embodiment of the device according to the invention with the weft thread clamped firmly. In the embodiment shown, the device 1 can supply a medium with a nozzle holder 9, a nozzle 3 with a blending tube 6 for inserting a weft thread 2 fixed to it, and within the area of the nozzle And a clamping device 7 arranged on the surface. The device 1 of the third embodiment is further arranged in or within the nozzle holder 9, or the nozzle 3, or the clamping device 7, and can be activated, for example, by a manual button 8a, for example 2 It includes a control valve 8, which is a / 2-way valve, or a 2 / 3-way valve, or a so-called 5 / 2-way valve, as shown in FIG. 4A. In the embodiment shown, the control valve 8 is connected to the input side of the supply line 8 b of the device 1 via the output of the clamping device 7. As shown in FIG. 4A, when the control valve 8 is in a position where its input is connected to the output leading to the clamping device, the clamping device is applied with the pressure of the medium in the supply line 8b and the weft 2 is firmly clamped.

  In one advantageous embodiment, the control valve 8 is designed as a 5 / 2-way valve, which allows the second output of the nozzle 3 to be fed to the control valve for weft threading. Connected through. If necessary, a fixed or adjustable throttle element 8c can be provided between the control valve and the nozzle so that the amount of medium flowing through the interior can be adapted for threading. it can. FIG. 4B shows a schematic diagram of this type of embodiment when threading a weft. As already described in the discussion of FIG. 4A, the control valve 8 is connected to the supply line 8b of the apparatus 1 on the input side, connected to the clamping device 7 via one output, and via the second output. It is connected to the nozzle 3, and a throttle element 8c can be provided in front of the nozzle. As shown in FIG. 4B, when the control valve 8 is in a position where its input is connected to the output connected to the nozzle, the nozzle 3 is routed via a supply line 8b and, if necessary, a throttle element 8c. Filled with supplied media. At the same time, the output connected to the clamping device is connected to the decompression opening at this position of the control valve, and as soon as the pressure supplied to the clamping device 7 drops to atmospheric pressure, for example correspondingly designed The clamp device is released by the reset spring thus released, and the path of the weft 2 is released. The weft yarn can then be introduced into the nozzle 3 with the aid of the medium supplied for threading.

  In a further advantageous embodiment, the apparatus 1 comprises a plurality of nozzles 3, each nozzle having a clamping device 7, a nozzle holder 9, or a nozzle 3, or a clamping device 7, or within them. A control valve 8 is provided. This apparatus advantageously includes a common supply line 8b so that the medium used to fill and / or thread the clamping device can be supplied to the apparatus. In one advantageous variant, this control valve and, if necessary, the throttle element are integrated in the nozzle holder and / or the nozzle 3 and / or the clamping device 7.

  An embodiment of a method for inserting a weft of a loom according to the present invention is described below with reference to FIGS. 4A and 4B. The insertion of the weft thread, and the associated threader and the tight clamp of the weft thread, is performed in this embodiment by means of a device 1 comprising a nozzle holder 9 and at least one nozzle 3 with a blended cotton tube 6 secured thereto. Is called. In this embodiment, the at least one nozzle is first fed with a medium for threading the weft yarn 2, and then the weft yarn is introduced. The weft thread introduced into the nozzle is firmly clamped by at least one clamping device 7 which is fed with media for that purpose. Prior to insertion, the weft clamp is released and the weft is inserted by the nozzle. In this process, the supply to the nozzle 3 for threading and / or the supply to the clamping device 7 for a strong clamp is applied to the nozzle holder 9 or the nozzle 3 or the clamping device 7 or Controlled by at least one control valve 8 disposed in them. In one advantageous variant, this control valve 8 is activated manually.

  In a further advantageous variant of this method, the switching between the supply to at least one nozzle for threading and the tight clamping of the weft is performed using at least one control valve 8. For this purpose, for example, a 2 / 2-way valve can be provided in the apparatus that can be used, for example in the manner described in the discussion relating to FIGS. 3A and 3B, or for example FIGS. 4A and 4B. A 5 / 2-way valve can be provided in the device that can be used in the manner described in the discussion.

  The device according to the invention and the method according to the invention for inserting a weft for a loom can, for example, activate a control valve attached to the nozzle holder or nozzle with one hand while the weft is the other. Since it is introduced by hand into the corresponding nozzle, the weft threading is simplified. It is a further advantage that this apparatus can be fed via a single supply line with the media used for feeding to the clamping device and / or threading. A common supply line for the media for threading and / or for the tight clamping of the weft allows for the economical production of the device and the economical installation of the device for inserting the weft into the loom.

1 is a schematic view of a prior art air jet loom. 1 is a perspective view of an embodiment of an apparatus for inserting a weft according to the present invention. It is the perspective view which looked at the Example shown by FIG. 2A from the other angle. FIG. 6 is a schematic view of a second embodiment of the device according to the invention with the weft thread firmly clamped. FIG. 6 is a schematic view of a preferred embodiment of the second embodiment when weft threading. FIG. 6 is a schematic view of a third embodiment of the device according to the invention with the weft thread firmly clamped. It is the schematic of the 3rd Example at the time of passing the weft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Device for inserting a weft 2 Weft 3, 3.1, 3.2, 3.3, 3.4 Nozzle 6, 6.1, 6.2, 6.3, 6.4 Mixed cotton pipe 7, 7 .1, 7.2, 7.3 Clamping device 8 Control valve 9 Nozzle holder

Claims (10)

A nozzle holder (9);
At least one nozzle (3, 3.1-3.4) comprising a blended cotton tube (6, 6.1-6.4) for inserting a weft (2) fixed thereto;
In order to firmly clamp the weft thread introduced into the nozzle, a medium can be supplied and at least one clamping device (7, 7.1 to 7.3) arranged in the area of the nozzle. A device (1) for inserting a weft for a loom,
Arranged in or in the nozzle holder (9), or the nozzle (3, 3.1-3.4), or the clamping device (7, 7.1-7.3), Further comprising at least one control valve (8) connected to the clamping device (7, 7.1-7.3) for controlling the supply to the clamping device. Device (1).   The at least one control valve (8) is further connected to the at least one nozzle (3, 3.1-3.4) for supplying media to the nozzle for the insertion of the weft (2) The apparatus of claim 1, wherein:   The supply to both the at least one nozzle (3, 3.1-3.4) and the at least one clamping device (7, 7.1-7.3) 3. Controlled using the at least one control valve (8) to switch between a supply for the nozzle for supply and a supply for the nozzle for the firm clamping of the weft. The device described in 1.   4. The device according to claim 1, wherein the at least one control valve (8) is configured as a control valve that can be operated manually.   A plurality of nozzles (3, 3.1-3.4), each nozzle comprising a clamping device (7, 7.1-7.3) and the nozzle holder or nozzle or 4. The device according to claim 1, further comprising a control valve (8) disposed therein.   6. A common supply line (8b) for allowing the medium used for supplying to the clamping device and / or for the threading to be supplied to the apparatus. The device described in 1.   The connection between the at least one control valve (8) and the at least one clamping device (7, 7.1 to 7.3) is inside the nozzle holder (9) and / or 7. A device according to any one of the preceding claims, formed inside the at least one nozzle (3, 3.1-3.4) and / or inside the at least one clamping device. The device described. A device (1) comprising a nozzle holder (9) and at least one nozzle (3, 3.1-3.4) comprising a blending tube (6, 6.1-6.4) fixed thereto In a method for inserting a weft for a loom using
A medium is supplied to the at least one nozzle for threading the weft (2), the weft is introduced;
The weft thread introduced into the nozzle is firmly clamped using at least one clamping device (7, 7.1-7.3) to which a medium is supplied for that purpose;
A method in which the weft clamp is released prior to the insertion and the weft is inserted using the nozzle;
To the nozzle (3, 3.1 to 3.4) for threading and / or to the clamping device (7, 7.1 to 7.3) for the tight clamping Said supply is arranged in or in said nozzle holder (9), or nozzle (3, 3.1-3.4), or clamping device (7, 7.1-7.3) Controlled by at least one control valve (8).   Using the at least one control valve (8), the supply of the weft thread to the at least one nozzle (3, 3.1-3.4) for the threading and the firmness of the weft thread The method according to claim 8, wherein a switch is performed between the clamps.   A device (1) equipped for inserting a weft thread and / or for carrying out the method according to claim 8 or claim 9 according to any one of claims 1 to 7. Equipped with a loom.

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