Weft yarn end drafting device for air jet loom

Abstract

The invention discloses a weft yarn end drafting device for an air jet loom. A drafting valve body is mounted at the tail end of a reed, and a weft feeler is mounted between the reed and the drafting valve body; the drafting valve body is provided with a drafting reed groove, the weft feeler is provided with a weft feeler reed groove, one end of the weft feeler reed groove is in butt joint with the air flow groove in the reed, and the other end of the weft feeler reed groove is in butt joint with the drafting reed groove. An air guide pipe is arranged on the drafting valve body, the inner opening end of the air guide pipe is located on the inner wall of the drafting reed groove, a first air nozzle and a second air nozzle are further formed in the inner wall of the drafting reed groove, the first air nozzle is used for blowing the tail section of weft into the air guide pipe and making the weft have continuous drafting force, and the second air nozzle is used for blowing the tail section of the weft out of the drafting reed groove; an open groove is formed in the drafting valve body, and a yarn hooking plate is installed in front of the open groove. The device applies drafting force to the tail section of the weft yarn to tension the weft yarn, so that the problem of resilience of the elastic weft yarn is solved.

Description

Technical Field

[0001] The invention relates to the technical field of weft insertion of an air jet loom, and in particular to a weft yarn end drafting device for an air jet loom. Background Art

[0002] The weft insertion of the air jet loom uses air as the weft insertion medium. The compressed air jet generates friction traction on the weft yarn, and then the weft yarn is brought through the shed. Usually, the flight trajectory of the weft yarn starts from the left side of the air jet loom and ends after reaching the right side of the loom, and then the beating operation is performed. When the existing air jet loom is used to weave heavy fabrics with smooth surfaces, the weft yarn is very easy to rebound after reaching the right side, that is, weft shrinkage occurs, which seriously affects the quality of the fabric.

[0003] In view of this, it is necessary to improve the existing technology. Summary of the invention

[0004] The object of the present invention is to provide a weft yarn end drafting device for an air jet loom, aiming to solve at least one of the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned object, the technical solution adopted is as follows:

[0005] A weft yarn end drafting device for an air jet loom, wherein a drafting valve body is installed at the tail end of a steel reed of the air jet loom, a weft feeler is installed between the steel reed and the drafting valve body, and when the steel reed swings, the weft feeler and the drafting valve body swing synchronously with the steel reed;

[0006] The drafting valve body is provided with a drafting reed groove, the notch of the drafting reed groove faces forward, the weft feeler is provided with a weft feeler reed groove, one end of the weft feeler reed groove is butted with the air flow groove on the steel reed, and the other end is butted with the drafting reed groove;

[0007] An air guide tube is inserted into the drafting valve body, and the inner end of the air guide tube is located on the inner wall of the drafting reed groove. The inner wall of the drafting reed groove is also provided with a first air jet port and a second air jet port. The first air jet port is used to blow the tail section of the weft yarn into the air guide tube and make the weft yarn have a continuous drafting force, and the second air jet port is used to blow the tail section of the weft yarn out of the drafting reed groove.

[0008] An opening slot is provided on the stretching valve body in a section between the head end of the stretching reed slot and the inner end of the air guide tube. The opening slot opens forward and is arranged crosswise with the stretching reed slot. A yarn hooking plate is installed in front of the opening slot. When the reed swings forward to the front end to beat the weft, the yarn hooking plate is located in the opening slot to avoid interference with the beating and at the same time be able to hook the weft yarn.

[0009] Preferably, the reed, the weft feeler and the drafting valve body are closely connected to each other and are respectively fixedly mounted on the reed seat of the air jet loom.

[0010] Preferably, the inner end of the air guide tube is located at the top of the inner wall of the drafting reed groove, and the first air jet is located at the bottom of the inner wall of the drafting reed groove and is arranged opposite to the inner end of the air guide tube.

[0011] Preferably, the second air jet is located at the rear of the inner wall of the drafting reed groove.

[0012] Preferably, the first air jet port is connected to an air source and is provided with a first solenoid valve for controlling the on and off of the first air jet port.

[0013] Preferably, the second air jet port is connected to an air source and is provided with a second solenoid valve for controlling the on and off of the second air jet port.

[0014] Preferably, the inlet end of the drafting reed groove located in the open groove is expanded.

[0015] Preferably, the yarn hooking plate is mounted on the front upper beam of the air jet loom through a bracket, and the position of the yarn hooking plate can be adjusted in the front-to-back direction and the left-to-right direction.

[0016] Preferably, a downwardly inclined slope is provided on the top of the hooking plate from front to back, and a hook groove opening forward is provided at the top of the slope. When the reed swings forward, the weft yarn slides forward along the slope and can fall into the hook groove.

[0017] Preferably, a yarn blowing tube is provided above the yarn hooking plate, the yarn blowing tube is connected to the air source, and is provided with a third solenoid valve for controlling on and off. When the weft is beaten, the tail section of the weft yarn is blown to the front of the weaving opening of the jet loom through the yarn blowing tube.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The invention discloses a weft yarn end drafting device for an air jet loom, which applies a drafting force to the tail section of the weft yarn to tighten the weft yarn, thereby avoiding weft shrinkage and solving the problem of elastic weft yarn rebound. In addition, the device has a simple and compact structure, saves space, is easy to install and maintain, and has a low manufacturing cost, and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a front view of the device of the present invention installed on the air jet loom.

[0022] Figure 2 It is a left-right side view of the device of the present invention installed on the air jet loom.

[0023] Figure 3 It is a schematic diagram of the structure of the draft valve body of the present invention.

[0024] Figure 4 It is a schematic diagram of the assembly of the draft valve body of the present invention.

[0025] In the figure: 1, weft feeler; 2, drafting valve body; 3, yarn hook plate; 4, yarn blowing tube; 5, reed; 6, reed seat; 7, drafting reed groove; 8, weft feeler reed groove; 9, air flow groove; 10, air guide tube; 11, first air jet; 12, first solenoid valve; 13, second air jet; 14, second solenoid valve; 15, opening groove; 16, flared shape; 17, bracket; 18, front upper beam; 19, yarn hook support; 20, hook groove; 21, yarn tube support. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] A preferred embodiment of the present invention provides a weft yarn end drafting device for an air jet loom, the device comprising: a weft feeler 1, a drafting valve body 2, a yarn hooking plate 3 and a yarn blowing tube 4.

[0029] like Figure 1-Figure 2 As shown, the existing air jet loom has a steel reed 5 fixedly mounted on a sley 6, and the weft is inserted from left to right. The drafting valve body 2 is located at the tail end of the steel reed 5, that is, the right side, and is fixedly mounted on the sley 6. A weft feeler 1 is provided between the steel reed 5 and the drafting valve body 2. Similarly, the weft feeler 1 is also fixedly mounted on the sley 6. The steel reed 5, the weft feeler 1 and the drafting valve body 2 are closely connected to each other. Based on the above arrangement, when the sley 6 drives the steel reed 5 to swing back and forth, the weft feeler 1 and the drafting valve body 2 swing synchronously with the steel reed 5.

[0030] like Figure 3-Figure 4As shown, the drafting valve body 2 is provided with a drafting reed groove 7 along the left-right direction, and the notch of the drafting reed groove 7 faces forward, and the weft feeler 1 is provided with a weft feeler reed groove 8 along the left-right direction, and the notch of the weft feeler reed groove 8 faces forward. The left end of the weft feeler reed groove 8 is butted with the airflow groove 9 on the steel reed 5, and the right end is butted with the drafting reed groove 7, thereby, the airflow groove 9, the weft feeler reed groove 8 and the drafting reed groove 7 form a straight reed groove arranged along the left-right direction.

[0031] The drafting valve body 2 is provided with an air guide tube 10 inserted from the top, and the inner end of the air guide tube 10 is located on the inner wall of the drafting reed groove 7, specifically, on the top of the inner wall of the drafting reed groove 7, that is, the upper side wall. At the bottom of the inner wall of the drafting reed groove 7, that is, the lower side wall, further, directly below the inner end of the air guide tube 10, a first air jet 11 is provided, the first air jet 11 is connected to an air source, and is provided with a first solenoid valve 12 for controlling the on and off of the first air jet 11.

[0032] The rear part of the inner wall of the drafting reed groove 7, i.e. the rear side wall, is further located on the left side of the first air jet 11, and is provided with a second air jet 13, which is connected to an air source and is equipped with a second solenoid valve 14 for controlling the on and off of the second air jet 13.

[0033] An opening groove 15 is provided on the draft valve body 2 , specifically, on the left side of the second air jet port 13 . The opening groove 15 is arranged to cross the draft reed groove 7 and penetrates the draft valve body 2 in the front-rear direction.

[0034] Furthermore, the entrance end of the drafting reed groove 7 in the opening groove 15 is in a flared shape 16, which facilitates the weft yarn to smoothly enter the right drafting reed 7 groove when passing through the opening groove 15 during weft insertion.

[0035] A yarn hooking plate 3 is provided in front of the opening slot 15. Specifically, the yarn hooking plate 3 is installed on the front upper beam 18 of the air jet loom through a bracket 17. Further, the yarn hooking plate 3 and the bracket 17 are connected through a yarn hook support 19, and the yarn hooking plate 3 can be adjusted up and down and forward and backward through the yarn hook support 19. A downwardly inclined slope is provided on the top of the yarn hooking plate 3 from front to back, and a hooking slot 20 opening forward is provided at the top of the slope.

[0036] A yarn blowing tube 4 is arranged above the yarn hooking plate 3, the yarn blowing tube 4 is connected to the air source, and is provided with a third electromagnetic valve (not shown) for controlling on and off. Further, the yarn blowing tube 4 is connected to the bracket 17 via a yarn tube support 21, and the blowing direction of the yarn blowing tube 4 can be adjusted via the yarn tube support 21.

[0037] The weft insertion process of the air jet loom equipped with the device of this embodiment is described as follows:

[0038] Under the action of airflow, the weft yarn flies from left to right along the airflow groove 9 on the reed 5. When the end of the weft yarn enters the weft detection reed groove 8, the weft detector 1 detects the weft yarn. At this time, the first solenoid valve 12 is opened, and the first air jet 11 jets into the air guide tube 10. The weft yarn continues to fly to the right. When it enters the drafting reed groove 7, the first air jet 11 blows the tail section of the weft yarn into the air guide tube 10, and the first air jet 11 continues to jet so that the weft yarn has a continuous drafting force.

[0039] Then the sley 6 drives the reed 5 to swing forward to beat the weft. During the forward swing, the weft yarn slides forward along the inclined surface on the hook plate 3 and can fall into the hook groove 20. At the same time, the hook plate 3 gradually extends into the open groove 15. The purpose of setting the open groove 15 is to prevent the hook plate 3 from interfering with the beating. After the beating is completed, the first electromagnetic valve 12 is closed, and the tail end of the weft yarn is still in the air guide tube 10.

[0040] Afterwards, the reed seat 6 drives the reed 5 to swing backward. During the backward swinging process, the hook groove 20 always hooks the weft yarn. When it swings backward to the initial position, since the front and rear distance of the weft swing is less than the length of the weft yarn in the air guide tube 10, there is still a small section of weft yarn in the air guide tube 10. At this time, the second solenoid valve 14 is opened, and the second air jet 13 blows the weft yarn out of the air guide tube 10 and out of the drafting reed groove 7. After a certain period of time, the second solenoid valve 14 is closed.

[0041] Finally, the third solenoid valve is opened, and the blowing tube 4 blows air, which blows the yarn end of the weft yarn to the front of the weaving opening of the air-jet loom and closes to the weft yarn woven in front to prevent the airflow driven by the backward movement of the reed 5 from bringing the yarn head back to the back. After a certain period of time, the third solenoid valve is closed.

[0042] In summary, the weft yarn end drafting device for an air jet loom described in the embodiment of the present invention applies a drafting force to the tail section of the weft yarn to tighten the weft yarn, thereby avoiding weft shrinkage and solving the problem of elastic weft yarn rebound. In addition, the device has a simple and compact structure, saves space, is easy to install and maintain, and has a low manufacturing cost, and is suitable for large-scale promotion and application.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A weft yarn end drafting device for an air jet loom, characterized in that: A drafting valve body is installed at the tail end of the reed of the air jet loom, and a weft feeler is installed between the reed and the drafting valve body. When the reed swings, the weft feeler and the drafting valve body swing synchronously with the reed. The drafting valve body is provided with a drafting reed groove, the notch of the drafting reed groove faces forward, the weft feeler is provided with a weft feeler reed groove, one end of the weft feeler reed groove is butted with the air flow groove on the steel reed, and the other end is butted with the drafting reed groove; An air guide tube is inserted into the drafting valve body, and the inner end of the air guide tube is located on the inner wall of the drafting reed groove. The inner wall of the drafting reed groove is also provided with a first air jet port and a second air jet port. The first air jet port is used to blow the tail section of the weft yarn into the air guide tube and make the weft yarn have a continuous drafting force, and the second air jet port is used to blow the tail section of the weft yarn out of the drafting reed groove. An opening slot is provided on the stretching valve body in a section between the head end of the stretching reed slot and the inner end of the air guide tube. The opening slot opens forward and is arranged crosswise with the stretching reed slot. A yarn hooking plate is installed in front of the opening slot. When the reed swings forward to the front end to beat the weft, the yarn hooking plate is located in the opening slot to avoid interference with the beating and at the same time be able to hook the weft yarn.

2. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The reed, the weft feeler and the drafting valve body are closely connected to each other and are respectively fixedly installed on the reed seat of the air jet loom.

3. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The inner end of the air guide pipe is located at the top of the inner wall of the drafting reed groove, and the first air jet port is located at the bottom of the inner wall of the drafting reed groove and is arranged opposite to the inner end of the air guide pipe.

4. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The second air jet is located at the rear of the inner wall of the drafting reed groove.

5. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The first jet port is connected to an air source and is provided with a first solenoid valve for controlling the on and off of the first jet port.

6. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The second jet port is connected to the gas source and is provided with a second solenoid valve for controlling the on and off of the second jet port.

7. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The inlet end of the drafting reed groove located in the open groove is in a flared shape.

8. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The yarn hooking plate is installed on the front upper beam of the air jet loom through a bracket, and the position of the yarn hooking plate can be adjusted in the front-back direction and the left-right direction.

9. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: The top of the hooking yarn plate is provided with a downwardly inclined surface from front to back, and a hook groove opening forward is provided at the top of the inclined surface. When the reed swings forward, the weft yarn slides forward along the inclined surface and can fall into the hook groove.

10. A weft yarn end drafting device for an air jet loom according to claim 1, characterized in that: A yarn blowing tube is arranged above the yarn hooking plate, which is connected to the air source and is equipped with a third electromagnetic valve for controlling on and off. When the weft is beaten, the tail section of the weft yarn is blown to the front of the weaving opening of the air jet loom through the yarn blowing tube.

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