Weft yarn cutting device

Abstract

The utility model relates to the technical field of textile machinery manufacturing, in particular to a weft yarn cutting device which comprises a cutting executing mechanism, a force transmission connecting rod mechanism and a cam mechanism. The cam mechanism is directly driven by the beating-up power transmission shaft, and power is transmitted to the cutting executing mechanism through the force transmission connecting rod mechanism. Therefore, on one hand, the reed for beating-up and the weft cutting device for cutting weft are jointly driven by the same power source, and it can be effectively guaranteed that the beating-up action and the weft cutting action are always kept synchronous in the whole weaving process; and on the other hand, in view of the characteristics of the cam mechanism, the non-constant-speed motion and the transient stay action with a large speed change range can be conveniently and quickly realized, so that the cutting execution mechanism can execute the cutting action according to an expected track.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery manufacturing technology, and in particular to a weft yarn cutting device. Background Technology

[0002] Rapier looms are renowned for their high speed, stability, and versatility, and are widely used in yarn-dyed fabrics, towels, silk fabrics, wool fabrics, and linen fabrics. They are the most common type of loom for weaving small to medium batches of patterned fabrics and have become one of the most widely used and numerous shuttleless looms. Rapier looms come in many forms, and can be classified into three types according to the configuration of the rapiers: single rapier looms, double rapier looms, and double-layer rapier looms.

[0003] In the operation of a rapier loom, the weft yarn is introduced by the feed rapier and the receive rapier. Then, the reed begins to swing and beat the weft. As the reed moves forward, the weft yarn is clamped and beaten. After the reed completes a single beating operation, the weft yarn is cut by a weft yarn cutting device to prepare for the next beating cycle.

[0004] In existing technology, the reed is driven by a weft-beating power transmission shaft. However, the weft yarn cutting device has its own independent power source (driven by a transmission shaft bridge device), which creates a time difference. Because the reed and weft yarn cutting device are driven by different power sources, it is difficult to ensure that the weft-beating and weft yarn cutting actions remain synchronized throughout the weaving process, inevitably affecting the smooth progress of the textile process and the final quality of the fabric. Therefore, it is urgent for technicians to address these issues. Utility Model Content

[0005] Therefore, in view of the above-mentioned existing problems and defects, the project team of this utility model collected relevant information, conducted multiple evaluations and considerations, and carried out continuous experiments and modifications by the project team members, which ultimately led to the emergence of this weft yarn cutting device. This device truly synchronizes the weft yarn cutting action with the reed beat-up action, which not only improves weaving efficiency but also ensures that the finished fabric has extremely high forming quality.

[0006] To address the aforementioned technical problems, this utility model relates to a weft yarn cutting device for performing a cutting operation on the weft yarn after weft insertion, facilitating the next feed-the-yarn cycle. The weft yarn cutting device includes a cutting execution mechanism, a force transmission linkage mechanism, and a cam mechanism. The cam mechanism is directly driven by the weft insertion power transmission shaft and transmits power to the cutting execution mechanism via the force transmission linkage mechanism.

[0007] As a further improvement to the technical solution disclosed in this utility model, the cam mechanism comprises a disc-shaped cam, a driven assembly, and a oscillating member. The disc-shaped cam is mounted and fixed on the weft-stretching power transmission shaft. The oscillating member is used to directly drive the force transmission linkage mechanism and is hinged to the frame. When the oscillating member is subjected to a pushing force from the driven assembly, it can freely perform yaw motion. The driven assembly makes line contact with the disc-shaped cam during the power transmission process.

[0008] As a further improvement to the technical solution disclosed in this utility model, the driven component includes a mounting shaft and a bearing. The bearing is mounted on the mounting shaft and, when subjected to frictional force from the disc-shaped cam, can freely perform circumferential rotational motion along its own central axis.

[0009] As a further improvement to the technical solution disclosed in this utility model, the cam mechanism also includes a spring. One end of the spring is connected to the oscillating member, and the other end is connected to the frame. Under the elastic restoring force of the spring, the bearing can press tightly against the profile surface of the disc-shaped cam.

[0010] As a further improvement to the technical solution disclosed in this utility model, at least one weight reduction notch is provided in the swing component.

[0011] As a further improvement to the technical solution disclosed in this utility model, the force transmission linkage mechanism includes a first link and a second link. The first link is assembled as a whole with the swinging component and, together with the second link, provides power support for the cutting action of the cutting actuator.

[0012] As a further improvement to the technical solution disclosed in this utility model, the force transmission linkage mechanism also includes a fisheye rod end joint bearing. The fisheye rod end joint bearing serves as the connection transition between the second linkage and the cutting actuator.

[0013] As a further improvement to the technical solution disclosed in this utility model, the cutting execution mechanism includes a mounting base, a first shear body, a second shear body, and a connecting member. The first and second shear bodies are both hinged to the mounting base and are positioned opposite each other, with their non-cutting ends connected by the connecting member.

[0014] As a further improvement to the technical solution disclosed in this utility model, the weft yarn cutting device also includes a fisheye bearing connecting rod. One end of the fisheye bearing connecting rod is connected to the mounting base, and the other end is connected to the frame. When the total length of the fisheye bearing connecting rod changes, the tilting posture of the cutting execution mechanism changes adaptively.

[0015] In the actual fabric weaving process, the weft yarn is introduced in opposite directions by the weft feeder and weft receiver. Then the reed begins to swing and beat the weft. As the reed moves forward, the weft yarn is clamped and beaten. At the same time, the beating power transmission shaft drives the cam mechanism and transmits the driving force to the cutting execution mechanism through the force transmission linkage mechanism. The weft yarn cutting device can cut the weft yarn to prepare for the next beating cycle.

[0016] In practical applications, the weft yarn cutting device disclosed in this utility model has achieved at least the following beneficial technical effects, specifically:

[0017] 1) The steel reed used for weft insertion and the weft yarn cutting device used for weft cutting share the same power source (weft insertion power transmission shaft), which can effectively ensure that the weft insertion action and the weft yarn cutting action remain synchronized throughout the entire weaving process, thereby ensuring that the weaving process can be implemented smoothly and that the woven fabric has high forming quality.

[0018] 2) The design structure of the weft yarn cutting device is relatively simple and compact, and the manufacturing and implementation cost is relatively low. Given the characteristics of the cam mechanism itself, it can conveniently and quickly realize non-uniform speed motion with a large speed range and short-term pause action. During the design phase, engineers only need to make an appropriate working profile of the cam mechanism, so that the cutting execution mechanism can perform the cutting action according to the expected trajectory. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram showing the positional relationship between the weft yarn cutting device of this utility model and the shuttleless textile machine.

[0021] Figure 2 yes Figure 1 A magnified view of part of I.

[0022] Figure 3 This is a three-dimensional schematic diagram of the weft yarn cutting device of this utility model (the weft drive shaft is shown in the form of a double-dotted line).

[0023] Figure 4 This is a three-dimensional schematic diagram of the cutting execution mechanism in this utility model from one perspective.

[0024] Figure 5 This is a three-dimensional schematic diagram of the cutting execution mechanism in this utility model from another perspective.

[0025] Figure 6 This is a three-dimensional schematic diagram of the force transmission linkage mechanism in this utility model.

[0026] Figure 7 This is a three-dimensional schematic diagram of the cam mechanism in this utility model.

[0027] Figure 8 This is a three-dimensional schematic diagram of the driven component in this utility model.

[0028] Figure 9 This is a three-dimensional schematic diagram of the swing component in this utility model.

[0029] 1-Cutting actuator; 11-Mounting base; 12-First shear body; 13-Second shear body; 14-Connector; 2-Force transmission linkage mechanism; 21-First link; 22-Second link; 23-Fisheye rod end joint bearing; 3-Cam mechanism; 31-Disc cam; 32-Driven assembly; 321-Mounting shaft; 322-Bearing; 33-Oscillating component; 331-Weight reduction notch; 34-Spring; 4-Fisheye bearing connecting rod. Detailed Implementation

[0030] In the description of this utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] The contents disclosed in this utility model will be further described in detail below with reference to specific embodiments. Figure 1 , 2 As shown, the weft yarn cutting device is used in conjunction with the reed. In the actual fabric weaving process, the weft yarn is introduced in opposite directions by the weft feeder and weft receiver. Then, the reed begins to swing and beat the weft under the drive of the weft beating power shaft. As the reed moves forward, the weft yarn is clamped and beaten. At the same time, the weft yarn cutting device is activated to cut the weft yarn, preparing for the next weft beating cycle.

[0032] Figure 3 A three-dimensional schematic diagram of the weft yarn cutting device of this utility model is shown, which can be seen to mainly consist of a cutting execution mechanism 1, a force transmission linkage mechanism 2, and a cam mechanism 3. Among them, the cam mechanism 3 is directly driven by the weft insertion power transmission shaft, and transmits power to the cutting execution mechanism 1 through the force transmission linkage mechanism 2.

[0033] By adopting the above technical solution, the steel reed used for weft insertion and the weft yarn cutting device used for weft cutting are both driven by the weft insertion power transmission shaft. In this way, the weft insertion action and the weft yarn cutting action are kept synchronized throughout the entire weaving process, thereby ensuring that the weaving process can be implemented smoothly and that the woven fabric has high forming quality.

[0034] It should also be noted that the design structure of the disclosed weft yarn cutting device is relatively simple and compact, and the manufacturing and implementation cost is relatively low. Given the characteristics of the cam mechanism 3 itself, it can conveniently and quickly realize non-uniform speed motion with a large speed range and short-term pause action. During the engineer's design phase, only an appropriate working contour of the cam mechanism 3 needs to be made, so that the cutting execution mechanism 1 can perform the cutting action according to the expected trajectory.

[0035] It is known that, based on design common sense, the cutting actuator 1 can adopt various design structures to achieve the cutting of weft yarns. However, a simple design structure, easy to manufacture and implement, and with extremely high cutting accuracy is recommended here, specifically: Figure 4 , 5 As shown, the cutting mechanism 1 mainly consists of a mounting base 11, a first shear body 12, a second shear body 13, and a connecting member 14. The first shear body 12 and the second shear body 13 are hinged to the mounting base 11 via a first hinge shaft and a second hinge shaft, respectively, and are positioned opposite each other. Their non-cutting ends are connected by the connecting member 14. The central axes of the first shear body 12, the second shear body 13, and the connecting member 14, along with the line connecting the first and second hinge shafts, virtually form a quadrilateral mechanism. In the actual fabric weaving process, when it is necessary to cut the weft yarn after weft insertion, the first shear body 12 and the second shear body 13 engage with each other due to the force applied, allowing the weft yarn to be cut smoothly and with high quality.

[0036] like Figure 7 As shown, the cam mechanism 3 mainly consists of a disc cam 31, a driven assembly 32, and a swinging member 33. The disc cam 31 is mounted on and fixed to the weft drive shaft via a key connection. The swinging member 33, hinged to the frame, directly drives the force transmission linkage 2. The swinging member 33 freely performs a yaw motion due to the pushing force from the driven assembly 32. The driven assembly 32 makes line contact with the disc cam 31 during the power transmission process. In the actual weaving process, the weft drive shaft continuously performs circumferential rotation to drive the reed to perform a yaw motion. Simultaneously, the disc cam 31 performs a following circumferential rotation. During this process, the driven assembly 32 remains in contact with the contour of the disc cam 31 and transmits power to the force transmission linkage 2 via the swinging member 33, enabling the force transmission linkage 2 to achieve a predetermined motion pattern.

[0037] In the initial design, the driven component 32 was preferably a driven post, which made line contact with the contour surface of the disc cam 31. It always slid along the contour surface of the disc cam 31, therefore, the surface of the driven post was prone to wear during long-term use, inevitably affecting the motion accuracy of the cam mechanism 3. In view of this, as a further optimization of the above technical solution, such as... Figure 8 As shown, the driven component 32 is preferably a combination of a mounting shaft 321 and a bearing 322. The bearing 322 is mounted on the mounting shaft 321 and, when subjected to frictional force from the disc cam 31, can freely perform circumferential rotation along its own central axis. Thus, on the one hand, due to the application of the bearing 322, the sliding friction between the driven component 32 and the disc cam 31 is transformed into rolling friction, resulting in less frictional wear and improving the service life and operational accuracy of the lifting cam mechanism 3.

[0038] Depend on Figure 7 As can also be clearly seen in the diagram, the cam mechanism 3 is further equipped with a spring 34. One end of the spring 34 is connected to the swing member 33, while the other end is connected to the frame. Under the elastic restoring force of the spring 33, the bearing 322 can press tightly against the contour surface of the disc cam 31, thus laying a good foundation for further improvement of the motion accuracy of the cam mechanism 3.

[0039] To reduce the weight of the oscillating component 33 and improve the responsiveness of the cam mechanism 3, as a further optimization of the above technical solution, such as Figure 9 As shown, multiple weight-reduction notches 331 are opened in the swing member 33 to reduce its weight as much as possible while ensuring that it has sufficient structural strength.

[0040] like Figure 6 As shown, the force transmission linkage mechanism 2 mainly consists of a first link 21 and a second link 22. The first link 21 is assembled with the swing member 33 as a whole, and works in conjunction with the second link 22 to provide power support for the cutting action of the cutting execution mechanism 1.

[0041] Furthermore, by Figure 6 As can be clearly seen in the diagram, the force transmission linkage mechanism 2 is further equipped with a fisheye rod end joint bearing 23. The fisheye rod end joint bearing 23 serves as the connection transition between the second link 22 and the cutting execution mechanism 1. Thus, on the one hand, by rotating the fisheye rod end joint bearing 23, the theoretical length of the second link 22 can be conveniently and quickly adjusted, facilitating on-site workers to debug the weft cutting device; on the other hand, in practical applications, if it is found that the theoretical length of the second link 22 does not meet the design requirements, only the fine-tuning fisheye rod end joint bearing 23 needs to be rotated, making the entire operation convenient and quick.

[0042] It is known that the cutting requirements for weft yarns vary depending on the fabric weaving process, mainly in the cutting angle. Therefore, as a further optimization of the above technical solution, such as... Figure 3 As shown, the weft yarn cutting device is further equipped with a fisheye bearing connecting rod 4. One end of the fisheye bearing connecting rod 4 is connected to the mounting base 11, and the other end is connected to the frame. When the total length of the fisheye bearing connecting rod 4 changes, the tilting posture of the cutting execution mechanism changes adaptively. In this way, when the tilting posture of the cutting execution mechanism 1 does not meet the design requirements, the worker only needs to rotate the fine-tuning fisheye bearing connecting rod 4, and the cutting execution mechanism 1 can be adjusted accordingly.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A weft yarn cutting device for performing a cutting operation on the weft yarn after weft insertion, facilitating the next feed action cycle, characterized in that... The weft yarn cutting device includes a cutting execution mechanism, a force transmission linkage mechanism, and a cam mechanism. The cam mechanism is directly driven by the weft insertion power transmission shaft and transmits power to the cutting execution mechanism via the force transmission linkage mechanism. The cam mechanism includes a disc cam, a driven component, and a swinging component. The disc cam is mounted and fixed on the weft insertion power transmission shaft. The swinging component drives the force transmission linkage mechanism and is hinged to the frame. When the swinging component is subjected to a pushing force from the driven component, it can freely perform a yaw motion. The driven component makes line contact with the disc cam during the power transmission process.

2. The weft trimming device according to claim 1, characterized in that The driven component includes a mounting shaft and a bearing; the bearing is mounted on the mounting shaft and, when subjected to frictional force from the disc-shaped cam, can freely perform circumferential rotational motion along its own central axis.

3. The weft yarn cutting device according to claim 2, characterized in that, The cam mechanism also includes a spring; one end of the spring is connected to the oscillating member, and the other end is connected to the frame; under the elastic restoring force of the spring, the bearing is able to press tightly against the profile surface of the disc cam.

4. The weft yarn cutting device according to claim 1, characterized in that, At least one weight-reduction notch is provided in the swing member.

5. The weft yarn cutting device according to any one of claims 1-4, characterized in that, The force transmission linkage mechanism includes a first link and a second link; the first link is assembled with the swing member as a whole, and works in conjunction with the second link to provide power support for the cutting action of the cutting execution mechanism.

6. The weft trimming device according to claim 5, characterized in that The force transmission linkage mechanism also includes a fisheye rod end joint bearing; the fisheye rod end joint bearing serves as the connection transition between the second linkage and the cutting actuator.

7. The weft trimming device according to claim 1, characterized in that The cutting mechanism includes a mounting base, a first shear body, a second shear body, and a connector; the first shear body and the second shear body are both hinged to the mounting base and are opposite to each other, and their non-cutting ends are connected by the connector.

8. The weft yarn cutting device according to claim 7, characterized in that, It also includes a fisheye bearing connecting rod; one end of the fisheye bearing connecting rod is connected to the mounting base, and the other end is connected to the frame; when the total length of the fisheye bearing connecting rod changes, the tilting posture of the cutting actuator changes adaptively.

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