Weft yarn braking device of air jet loom

Abstract

The utility model discloses a weft yarn braking device of an air jet loom, which is characterized in that a second support plate and a weft shifting fork are arranged between a front yarn guide plate and a rear yarn guide plate, and a third through hole for a weft yarn to pass through is formed in the second support plate, so that the weft yarn passes through a first through hole of the front yarn guide plate, the third through hole and a second through hole of the rear yarn guide plate in sequence; the weft shifting fork is driven by a servo motor and is in pressure contact with or separated from weft yarns through a U-shaped yarn pressing rod, a second supporting plate is arranged in the middle of a rectangular frame of the U-shaped yarn pressing rod, when the yarn pressing rod is separated from the weft yarns, the weft yarns run linearly, and when the yarn pressing rod is in pressure contact with the weft yarns, the yarn pressing rod is pressed on the weft yarns on the two sides of a third through hole; the weft is bent under the pressure action of the yarn pressing rod to form a wavy bent channel, at the moment, friction is formed between the weft and the first through hole, the third through hole, the second through hole and the yarn pressing rod, the weft braking effect is achieved, the yarn is slowly decelerated, and breakage caused by sudden stop of the weft insertion yarn is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of textile equipment, and relates to an air-jet loom, in particular to a weft yarn braking device for an air-jet loom. Background Art

[0002] An air-jet loom is an important textile equipment commonly used in the textile field. In the prior art, when inserting the weft, it is necessary to keep the central holes on the yarn guide frame, yarn guide plate and nozzle in a straight line. When the weft insertion ends, the weft yarn often breaks due to sudden stop, resulting in weft insertion failure.

[0003] It can be seen that the air-jet loom in the prior art needs to be further improved to solve the above technical problems. Summary of the Utility Model

[0004] To solve the technical problems in the background art, the utility model proposes a weft yarn braking device for an air-jet loom, which can slow down the weft yarn and avoid the sudden stop of the weft insertion yarn from breaking.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A weft yarn braking device for an air-jet loom includes a front yarn guide plate, a rear yarn guide plate and a weft fork arranged between the front yarn guide plate and the rear yarn guide plate. Coaxial first through holes and second through holes are respectively formed on the front yarn guide plate and the rear yarn guide plate. The weft fork is driven by a servo motor and swings along the circumferential direction of the output shaft of the servo motor to press and contact / separate from the weft yarn passing through the first through hole and the second through hole in sequence.

[0007] Further, one end of the servo motor is provided with a first motor bracket. A long strip-shaped through groove is formed in the middle of the first motor bracket. The output shaft of the servo motor passes through the through groove and is connected to the weft fork. The output shaft of the servo motor is slidably connected in the through groove and moves along the extending direction of the through groove.

[0008] Further, a plurality of first strip-shaped holes parallel to the through groove are formed on the first motor bracket. A first bolt is slidably connected in the first strip-shaped hole. The first bolt passes through the first strip-shaped hole and is threadedly connected to the servo motor to adjust / fix the installation position of the servo motor on the first motor bracket.

[0009] Further, a brake block is provided on one side of the first motor bracket. The brake block is arranged on the swinging path of the weft fork to limit the swinging amplitude of the weft fork.

[0010] Further, the weft fork includes a rotating block connected to the output shaft of the servo motor and a U-shaped yarn pressing rod fixedly connected to the lower part of the rotating block. The weft fork presses and contacts / separates from the weft yarn through the yarn pressing rod.

[0011] Further, a first support plate and a second support plate are provided on one side of the leading yarn guide plate. One end of the first support plate is fixedly connected to the leading yarn guide plate, and the other end is fixedly connected to the second support plate. The second support plate is arranged parallel to the leading yarn guide plate, and a third through hole coaxial with the first through hole is formed on the second support plate, so that the weft yarn sequentially passes through the first through hole, the third through hole and the second through hole.

[0012] Further, the second support plate is arranged in the middle of the rectangular frame formed by the U-shaped yarn pressing rod and the rotating block, and the weft fork swings between the braking block and the first support plate.

[0013] The beneficial effects of the present utility model: The weft yarn braking device of the air-jet loom provided by this application, by arranging a second support plate and a weft fork between the leading yarn guide plate and the trailing yarn guide plate, and opening a third through hole for the weft yarn to pass through on the second support plate, so that the weft yarn sequentially passes through the first through hole of the leading yarn guide plate, the third through hole and the second through hole of the trailing yarn guide plate. The weft fork is driven by a servo motor, and contacts / separates with the weft yarn through the U-shaped yarn pressing rod. The second support plate is arranged in the middle of the rectangular frame of the U-shaped yarn pressing rod. When the yarn pressing rod separates from the weft yarn, the weft yarn runs linearly. When the yarn pressing rod contacts and presses on the weft yarn, the yarn pressing rod presses on the weft yarn on both sides of the third through hole respectively. The weft yarn bends under the pressure of the yarn pressing rod, forming a wavy bending channel. At this time, frictions are formed between the weft yarn and the first through hole, the third through hole, the second through hole and the yarn pressing rod respectively, achieving the effect of weft yarn braking, making the yarn slow down, and avoiding the breakage caused by the sudden stop of the weft yarn. Generally, the width of the weft yarn used for producing fiberglass cloth is ≤1mm, and the width of the weft yarn determines the contact area between the weft yarn and the weft fork. By adjusting the installation position of the servo motor in this application, the height of the weft fork can be adjusted, so that the relative position of the passing weft yarn and the acting surface of the ceramic yarn pressing rod of the weft fork can be changed. When the ceramic is worn due to long-term contact and friction between the ceramic yarn pressing rod and the weft yarn on the same contact surface, the height of the servo motor and the weft fork connected to the motor output shaft can be freely adjusted within the range of the strip-shaped holes on the motor bracket, and the contact position between the weft yarn and the ceramic yarn pressing rod can be changed multiple times to achieve the problem of extending the service life of the weft fork and saving production costs. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] Figure 2 It is an exploded schematic diagram of the present utility model.

[0016] Figure 3 It is a schematic diagram of the leading yarn guide plate of the present utility model.

[0017] Figure 4 It is a schematic diagram of the trailing yarn guide plate of the present utility model.

[0018] Figure 5 It is a schematic diagram of the weft fork of the present utility model.

[0019] Figure 6 This is a schematic diagram of the first motor bracket of the present utility model.

[0020] Figure 7 This is a schematic diagram of the second motor bracket of the present utility model. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] As Figure 1-4 shown, the present utility model provides a weft braking device for an air-jet loom, including a front yarn guide plate 1, a rear yarn guide plate 2, and a picking fork 3 disposed between the front yarn guide plate 1 and the rear yarn guide plate 2. One side of the front yarn guide plate 1 is provided with a first support plate 12 and a second support plate 13. One end of the first support plate 12 is fixedly connected to the front yarn guide plate 1, and the other end is fixedly connected to the second support plate 13. The second support plate 13 is arranged parallel to the front yarn guide plate 1. The front yarn guide plate 1, the rear yarn guide plate 2, and the second support plate 13 are respectively provided with first through holes 11, second through holes 21, and third through holes 14 for the weft yarn to pass through. The first through holes 11, the second through holes 21, and the third through holes 14 are coaxially arranged so that the weft yarn sequentially passes through the first through hole 11, the third through hole 14, and the second through hole 21.

[0023] The picking fork 3 is driven by a servo motor 4 to swing along the circumferential direction of the output shaft of the servo motor 4 to press against and separate from the weft yarn sequentially passing through the first through hole 11, the third through hole 14, and the second through hole 21. As Figure 5 shown, the picking fork 3 includes a rotating block 31 connected to the output shaft of the servo motor 4 and a U-shaped yarn pressing rod 32 fixedly connected below the rotating block 31. The picking fork 3 presses against and separates from the weft yarn through the yarn pressing rod 32. The second support plate 13 is arranged in the middle of the rectangular frame formed by the U-shaped yarn pressing rod 32 and the rotating block 31. When the yarn pressing rod 32 separates from the weft yarn, the weft yarn sequentially passes through the first through hole 11, the third through hole 14, and the second through hole 21 and runs linearly. When the yarn pressing rod 32 presses against the weft yarn, the yarn pressing rod 32 presses on the weft yarn on both sides of the third through hole 14. The weft yarn is bent under the pressure of the yarn pressing rod 32 to form a wavy bending channel. At this time, frictions are formed between the weft yarn and the first through hole 11, the third through hole 14, the second through hole 21, and the yarn pressing rod 32 respectively, achieving the effect of weft braking, slowing down the yarn slowly, and avoiding breakage caused by the sudden stop of the weft yarn.

[0024] One end of the servo motor 4 is provided with a first motor bracket 5, as Figure 6 shown. A long strip-shaped through slot 51 is formed in the middle of the first motor bracket 5. The output shaft of the servo motor 4 passes through the through slot 51 and is connected to the rotating block 31 of the weft fork 3. The output shaft of the servo motor 4 is slidably connected in the through slot 51 and can move along the extending direction of the through slot 51, so that the installation position of the servo motor 4 can be adjusted up and down. Two first strip-shaped holes 52 parallel to the through slot 51 are formed in the first motor bracket 5. A first bolt 53 is slidably connected in the first strip-shaped hole 52. The first bolt 53 passes through the first strip-shaped hole 52 and is threadedly connected to the servo motor 4. By loosening / tightening the first bolt 53, the installation position of the servo motor 4 on the first motor bracket 5 can be adjusted / fixed, and by adjusting the installation position of the servo motor 4, the installation height of the weft fork 3 can be adjusted, thereby changing the relative position where the weft yarn contacts the ceramic yarn pressing rod 32 of the weft fork 3, avoiding that the weft yarn passing through the weft fork 3 always contacts and rubs against the same position of the ceramic yarn pressing rod 32 of the weft fork 3, reducing the wear caused to the yarn pressing rod 32, prolonging the short service life of the weft fork 3, and reducing the production cost.

[0025] A brake block 54 is provided on one side of the first motor bracket 5. The brake block 54 is arranged on the swinging path of the weft fork 3 to limit the swinging amplitude of the weft fork 3. Since there is also a first support plate 12 on the swinging path of the weft fork 3, the weft fork 3 can swing between the brake block 54 and the first support plate 12 to achieve the pressing contact / separation with the weft yarn.

[0026] The other end of the servo motor 4 is provided with a second motor bracket 6, as Figure 7 shown. Two second strip-shaped holes 61 parallel to the through slot 51 are formed in the second motor bracket 6. A second bolt 62 is slidably connected in the second strip-shaped hole 61. The second bolt 62 passes through the second strip-shaped hole 61 and is threadedly connected to the servo motor 4. By loosening / tightening the second bolt 62, the installation position of the servo motor 4 on the second motor bracket 6 can be adjusted / fixed. The tops of the first motor bracket 5 and the second motor bracket 6 are both fixedly installed on the top cover 7 through fixing bolts. The front end of the top cover 7 is fixedly connected and fixed to the front yarn guide plate 1 through a fixing bolt. The rear yarn guide plate 2 is fixedly connected to the second motor bracket 6 through a fixing bolt.

[0027] When this application is installed, the weft fork 3 is in the initial position in contact with the first support plate 12, the yarn pressing rod 32 is lifted and separated from the weft yarn. The weft yarn passes through the first through hole 11, passes under one side of the yarn pressing rod 32, passes through the third through hole 14, then passes under the other side of the yarn pressing rod 32, and passes out of the second through hole 21 and enters the nozzle. The weft yarn runs in a straight line. When the weft insertion is nearly finished, the servo motor 4 drives the weft fork 3 to swing to the position of the brake block 54, and the yarn pressing rod 32 presses down. The yarn pressing rod 32 presses against the weft yarn with pressure. The yarn pressing rod 32 presses on the weft yarn on both sides of the third through hole 14 respectively. The weft yarn is bent under the action of the pressure of the yarn pressing rod 32, forming a wavy bending channel. At this time, friction is formed between the weft yarn and the first through hole 11, the third through hole 14, the second through hole 21 and the yarn pressing rod 32 respectively, achieving the effect of braking the weft yarn, making the yarn slow down, and avoiding the breakage caused by the sudden stop of the weft insertion yarn. At the same time, by loosening / tightening the first bolt 53, the installation position of the servo motor 4 on the first motor bracket 5 is adjusted / fixed, and by adjusting the installation position of the servo motor 4, the installation height of the weft fork 3 is adjusted, thereby changing the relative position of the weft yarn in contact with the ceramic yarn pressing rod 32 of the weft fork 3, avoiding the weft yarn passing through the weft fork 3 from always contacting and rubbing with the same position of the ceramic yarn pressing rod 32 of the weft fork 3, reducing the wear on the yarn pressing rod 32, prolonging the service life of the weft fork 3, and reducing the production cost.

[0028] The above content is only an example and explanation of the structure of the present utility model. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the structure of the utility model or exceed the scope defined by this claim book, they should all belong to the protection scope of the present utility model.

Claims

1. A weft yarn braking device for an air jet loom, characterized in that: The invention comprises a front yarn guide plate (1), a rear yarn guide plate (2) and a weft shifting fork (3) arranged between the front yarn guide plate (1) and the rear yarn guide plate (2); the front yarn guide plate (1) and the rear yarn guide plate (2) are respectively provided with a coaxial first through hole (11) and a second through hole (21); the weft shifting fork (3) is driven by a servo motor (4) and swings along the circumferential direction of the output shaft of the servo motor (4) to pressurize the weft yarns passing through the first through hole (11) and the second through hole (21) in sequence to contact / separate.

2. The weft yarn braking device according to claim 1, characterized in that: A first motor bracket (5) is provided at one end of the servo motor (4), a long strip through slot (51) is provided in the middle of the first motor bracket (5), an output shaft of the servo motor (4) passes through the through slot (51) and is connected to the weft shifting fork (3), and the output shaft of the servo motor (4) is slidably connected in the through slot (51) and moves along the extending direction of the through slot (51).

3. The weft yarn braking device according to claim 2, characterized in that: The first motor bracket (5) is provided with a plurality of first strip holes (52) arranged parallel to the through slots (51), and first bolts (53) are slidably connected in the first strip holes (52). The first bolts (53) pass through the first strip holes (52) and are threadedly connected to the servo motor (4) to adjust / fix the installation position of the servo motor (4) on the first motor bracket (5).

4. The weft yarn braking device according to claim 3, characterized in that: A brake block (54) is provided on one side of the first motor bracket (5). The brake block (54) is arranged on the swing path of the weft shifting fork (3) to limit the swing amplitude of the weft shifting fork (3).

5. The weft yarn braking device according to claim 4, characterized in that: The weft shifting fork (3) comprises a rotating block (31) connected to the output shaft of a servo motor (4) and a U-shaped yarn pressing rod (32) fixedly connected below the rotating block (31), and the weft yarn is pressed into contact / separated by the U-shaped yarn pressing rod (32).

6. The weft brake device according to claim 5, characterized in that: A first support plate (12) and a second support plate (13) are provided on one side of a front yarn guide plate (1); one end of the first support plate (12) is fixedly connected to the front yarn guide plate (1), and the other end is fixedly connected to the second support plate (13); the second support plate (13) is arranged parallel to the front yarn guide plate (1); a third through hole (14) coaxial with the first through hole (11) is opened on the second support plate (13), so that the weft yarn passes through the first through hole (11), the third through hole and the second through hole (21) in sequence.

7. The weft brake device according to claim 6, characterized in that: The second support plate (13) is arranged in the middle of a rectangular frame formed by a U-shaped yarn pressing rod (32) and a rotating block (31), and the weft shifting fork (3) swings between the braking block (54) and the first support plate (12).

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