Weft yarn shearing device for rapier loom

Abstract

The utility model relates to a weft yarn shearing device used on a rapier loom. The weft yarn shearing device is composed of a body support, a shearing mechanism and a suction positioning mechanism. The shearing mechanism comprises a swing arm and a shearing base, the swing arm is fixedly connected with the body support through a plug screw shaft, a roller is connected with the swing arm through a bearing, a sliding groove is formed in the front end of the swing arm, the swing arm is fixedly connected with a shearing chuck through the sliding groove, and the shearing chuck and a shearing clamping piece jointly clamp a blade to form a shearing assembly. The shearing base is fixedly connected to the body support through two long grooves and can move up and down to adjust the position of the shearing base, a cutter pad matched with the blade is fixedly connected to the shearing base, a weft yarn positioning piece is fixedly connected to the outer side of the cutter pad, and a spring is arranged between the swing arm and the shearing base. The suction positioning mechanism comprises a suction box body, a suction chamber cover plate and a yarn guide plate. The device has the characteristics of simple structure, convenience and reliability in adjustment, wide application range and the like.

Description

Technical Field

[0001] This utility model relates to a weft yarn cutting device for rapier looms, belonging to the field of rapier loom technology. Background Technology

[0002] In existing rapier loom technology, weft yarn shearing on the weft supply side involves the reed pushing the weft yarn towards the weft opening, while simultaneously pushing it into the weft yarn shearing opening. At this point, one end of the weft yarn is fixed at the weft opening, and the other end is held by the weft yarn bobbin. When the next weft insertion occurs, the rapier head moves along the rapier's trajectory and captures the weft yarn. Only after the rapier head captures the weft yarn is the yarn cut by the shearing device, marking the start of the second weft insertion. The timing of the weft yarn shearing is crucial. If the weft yarn is sheared too early, it can easily cause the weft yarn to fall off, resulting in weft stoppage. If the weft yarn is sheared too late, it can easily cause damage to the rapier and rapier head.

[0003] In addition, in existing rapier loom technology, the weft feed side is usually cut at around 70 degrees. Before the second weft insertion and cut, i.e., between 0 and 70 degrees, the weft feed side is always in a taut state. Especially during the period when the rapier captures the weft, the tension between the weft and warp openings can easily cause tension differences on the left and right sides of the entire fabric. This is especially true when producing carbon fiber fabrics, as carbon fiber has a low coefficient of friction, making it easier to cause tension changes in the entire product during production. Utility Model Content

[0004] The purpose of this invention is to provide a reliable weft-cutting device for operation on rapier looms, which not only overcomes the above-mentioned shortcomings but also reduces the waste of waste selvage yarn.

[0005] The purpose of this utility model is achieved through the following technical solution, comprising three parts: a main support, a shearing mechanism, and a suction positioning mechanism. The shearing mechanism consists of a swing arm and a shearing base. The swing arm is fixedly connected to the main support via a screw shaft, and a roller is connected to the swing arm via a bearing. A sliding groove is provided at the front end of the swing arm, and a shearing chuck is fixedly connected to it via the groove. The shearing chuck and the shearing clamp together hold the blade to form a shearing assembly. The shearing base is fixedly connected to the main support via two long slots and can move up and down to adjust its vertical position. A blade pad, configured to match the blade, is fixedly connected to the shearing base, and a weft positioning piece is fixedly connected to the outside of the blade pad. A spring is provided between the swing arm and the shearing base.

[0006] The suction positioning mechanism comprises a suction box, a suction chamber cover, and a yarn guide plate. The suction box is fixed to the main body support via a long, narrow groove at the rear and can move up and down to adjust its height. The suction box is a hollow box structure with a side opening for connecting to an external suction device. The top of the suction box has an opening and a 1 / 4 notch. The upper surface of the suction box is fixed to the suction chamber cover, forming a suction hole. An arc-shaped yarn guide finger at the front end of the suction chamber cover guides the weft yarn smoothly into the suction hole. A yarn guide plate is vertically mounted at the front end of the suction box. The working end of the yarn guide plate has an upper and a lower yarn guide arc surface, which are at a certain angle to the main body, preferably 45 degrees, and are arranged parallel and staggered. A yarn guide hook is located at the rear of the lower yarn guide arc surface of the yarn guide plate.

[0007] The main advantage of this invention is that the entire weft yarn cutting device is installed on the weft insertion side and as close as possible to the fabric selvage, maintaining a minimal distance between the cutting edge and the fabric selvage to achieve a waste-free edge effect and reduce material loss. Simultaneously, when the weft yarn enters the weft insertion point, the swing arm drives the blade to immediately cut the weft yarn. The end of the weft yarn is then captured and held by the suction port of the suction box, preventing interference with the previous weft yarn during the second weft insertion. Furthermore, the cutting time can be adjusted arbitrarily between 0-60°, with a preferred cutting time of 10-30°. This invention is applicable to industrial fibers such as glass fiber, carbon fiber, and aramid fiber, from coarse to fine. It features a simple structure, convenient and reliable adjustment, and a wide range of applications. Attached Figure Description

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0009] Figure 1 A top view of the device of the present invention is shown, which is arranged on a rapier loom;

[0010] Figure 2 A three-dimensional mounting diagram of the device of the present invention is shown in one embodiment.

[0011] Figure 3 A three-dimensional structural schematic diagram of the device of the present invention from another angle in one embodiment is shown.

[0012] Figure 4 An exploded view of the suction chamber of the device of the present invention is shown.

[0013] Among them, 1-weft yarn cutting device, 2-cutting mechanism, 3-suction positioning mechanism, 4-body support, 5-weft yarn, 6-fabric, 7-steel reed, 8-weft yarn clamp, 9-weft selection finger, 10-introduction direction, 20-swing arm, 21-screw shaft, 22-roller, 23-cutting chuck, 24-cutting clamp, 25-blade, 26-cutting base, 27-blade pad, 28-weft yarn positioning piece, 29-spring, 30-suction box, 31-slide groove, 32-external suction interface, 33-suction hole, 34-suction cover plate, 35-yarn guide finger, 36-yarn guide plate, 37-lower yarn guide arc surface, 38-upper yarn guide arc surface, 39-yarn guide hook. Detailed Implementation

[0014] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description of the implementation methods, structure, and features of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0015] Please see Figures 1 to 4 , Figure 1 This is a top view of the weft yarn cutting device 1 of this application installed on a rapier loom. It is installed between the weft selection finger 9 and the fabric 6. The figure shows two weft yarns. In specific implementation, the weft yarn holder 8 moves along the running trajectory and is introduced in the direction 10. After colliding with the weft yarn 5 held by the weft selection finger 9 and the suction port 33 in the weft yarn cutting device 1, the weft yarn 5 is captured by the weft yarn holder 8. Then, the front end of the weft yarn 5 is pulled out from the suction port 33 and introduced into the shed of the fabric. After the weft yarn 5 completes the weft insertion, it is moved by the reed 7 into the cutting edge of the scissor blade 25 of the weft yarn cutting device 1. When the reed 7 swings back, the blade 25 can cut the weft yarn 5. The free end of the cut weft yarn 5 is captured again by the suction port 33 to prepare for the second weft insertion.

[0016] In this embodiment, the weft yarn cutting device 1 includes a body support 4, a cutting mechanism 2, and a suction and positioning mechanism 3. For example... Figures 2 to 4 As shown, the shearing mechanism 2 comprises a swing arm 20 and a shearing base 26. The swing arm 20 is fixedly connected to the main support 4 via a screw shaft 21. A roller 22 is connected to the swing arm 20 via a bearing (not shown). The front end of the swing arm 20 is provided with a sliding groove 20a, and a shearing chuck 23 is fixedly connected to it via the sliding groove 20a. The shearing chuck 23 and the shearing clamp 24 together clamp the blade 25 to form a shearing assembly. The shearing base 26 is fixedly connected to the main support 4 via two long slots 26a and can move up and down to adjust its vertical position. A blade pad 27, configured to match the blade 25, is fixedly connected to the shearing base 26, and a weft positioning piece 28 is fixedly connected to the outside of the blade pad 27. A spring 29 is provided between the swing arm 20 and the shearing base 26.

[0017] The suction positioning mechanism 3 comprises a suction box 30, a suction chamber cover 34, and a yarn guide plate 36. The suction box 30 is fixed to the main body support 4 via a long strip-shaped sliding groove 31 at the rear, and can move up and down to adjust its height. The suction box 30 is a hollow box structure with a side opening for an external suction port 32, which connects to an external suction device (not shown). The suction box 30 has an opening on its top and a 1 / 4 notch. The upper surface of the suction box 30 is fixed to the suction chamber cover 34, and the two are fixed together to form a suction hole 33. The front end of the suction chamber cover 34 has an arc-shaped yarn guide finger 35, which can guide the weft yarn smoothly into the suction hole 33. A yarn guide plate 36 is vertically installed at the front end of the suction box 30. The working end of the yarn guide plate 36 is provided with an upper yarn guide arc surface 38 and a lower yarn guide arc surface 37. The two yarn guide arc surfaces are at a certain angle to the body, preferably 45 degrees, and the two arc surfaces are arranged in parallel and staggered. A yarn guide hook 39 is provided at the rear of the lower yarn guide arc surface 37 of the yarn guide plate 36.

[0018] The entire weft yarn shearing device of this application is installed on the weft input side and as close as possible to the fabric selvage, ensuring a minimal distance between the shear cut and the fabric selvage to achieve a waste-free effect and reduce material loss. Simultaneously, the shearing time can be adjusted arbitrarily between 0-60°, with a preferred shearing time of 10-30°, providing greater flexibility in adjustment. The entire weft yarn shearing device is driven by a cam (not shown) on the loom's shear shaft, which drives the swing arm to reciprocate up and down to shear the weft yarn. Blade replacement is simpler and less costly.

[0019] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A weft yarn cutting device for a rapier loom, characterized in that: It comprises three parts: a main support, a shearing mechanism, and a suction positioning mechanism. The shearing mechanism consists of a swing arm and a shearing base. The swing arm is fixedly connected to the main support via a screw shaft, and the roller is connected to the swing arm via a bearing. The front end of the swing arm has a sliding groove, and a shearing chuck is fixedly connected to the sliding groove. The shearing chuck and the shearing clip together hold the blade to form a shearing assembly. The shearing base is fixedly connected to the main support via two long slots and can move up and down to adjust the position of the shearing base. A blade pad that matches the blade is fixedly connected to the shearing base, and a weft positioning piece is fixedly connected to the outside of the blade pad. A spring is provided between the swing arm and the shearing base.

2. The weft yarn cutting device according to claim 1, characterized in that: The suction positioning mechanism comprises a suction box, a suction chamber cover, and a yarn guide plate. The suction box is fixed to the main body support via a long, narrow groove at the rear and can be moved up and down to adjust its height. The suction box is a hollow box structure with a side opening for connecting to an external suction device. The suction box has a hole and a 1 / 4 notch at the top. The upper surface of the suction box is fixed to the suction chamber cover, forming a suction hole. The front end of the suction chamber cover has an arc-shaped yarn guide finger to guide the weft yarn smoothly into the suction hole. A yarn guide plate is vertically installed at the front end of the suction box. The working end of the yarn guide plate has an upper and a lower yarn guide arc surface. The two yarn guide arc surfaces are at a certain angle to the main body, preferably 45 degrees, and are arranged in parallel and staggered. A yarn guide hook is provided at the rear of the lower yarn guide arc surface of the yarn guide plate.

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