A yarn cutting device and computerized flat knitting machine

Abstract

The present application relates to the technical field of knitting, in particular to a yarn cutting device and a computerized flat knitting machine. The device comprises a fixing frame, a pressing plate, a cutter, a first mechanism and a second mechanism. The pressing plate and the cutter are arranged below the fixing frame, and the yarn conveying path passes through the cutter and the pressing plate in sequence. The first mechanism is used to drive the pressing plate to perform lifting action to realize yarn pressing, and the second mechanism is used to drive the cutter to perform lifting action to complete yarn cutting. During work, the driving sleeve of the second mechanism descends, the driving pin pushes the helical groove of the first column body to move downward, the guide part of the first column body slides from the first annular groove into the second annular groove, and the pressing plate is preferentially lowered to press the yarn; then the inclined groove forces the driven pin to move to drive the cutter to cut downward, forming a time sequence difference of pressing first and cutting later. The design continuously fixes the yarn by the pressing plate until the cutting is completed, effectively inhibits the elastic recoil of the yarn at the moment of cutting, and eliminates the problem of yarn rebounding during knitting.

Description

Technical Field

[0001] This invention relates to the field of knitting technology, and in particular to a yarn cutting device and a computerized flat knitting machine. Background Technology

[0002] In the field of computerized flat knitting machines, the thread pressing and cutting mechanism is a key component used to assist in yarn handling and cutting operations. Various design schemes exist in the prior art, such as a thread pressing and cutting mechanism for computerized flat knitting machines (refer to CN 215366215U). This device uses a motor to drive an electric push rod, which moves a push plate, and combined with a spring device and clamping plate, presses the yarn while simultaneously using a cutting blade for cutting. Furthermore, this mechanism includes a pressure plate and a support structure, which can partially fix the yarn before cutting, aiming to improve the overall operational efficiency and stability. This type of technology represents a conventional implementation in the field and is widely used in yarn knitting equipment.

[0003] However, existing pressing and cutting techniques have a prominent problem in the yarn cutting stage: due to the lack of precise timing between the cutting and pressing actions, the yarn is not adequately fixed at the moment of cutting, leading to frequent elastic shrinkage. This not only causes the yarn to come loose or shift, but also seriously affects the continuity of the weaving process and the quality of the finished product, increasing equipment failure rates and maintenance needs. Summary of the Invention

[0004] To address the shortcomings mentioned above in the background technology, the present invention provides a yarn cutting device and a computerized flat knitting machine.

[0005] The present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a yarn cutting device, which includes a fixing frame, a pressure plate, a cutting knife, a first mechanism, a second mechanism and a transmission mechanism, wherein the yarn passes sequentially below the cutting knife and the pressure plate and is connected to the yarn feeding nozzle of the flat knitting machine;

[0007] The pressure plate and the cutting blade are disposed under the fixed frame, and both the pressure plate and the cutting blade are restricted to vertically moving up and down relative to the fixed frame;

[0008] The first institution includes:

[0009] A first cylindrical body is fixed to the fixing frame. The inner wall of the first cylindrical body is provided with a first annular groove and a second annular groove. The inner wall of the first cylindrical body is also provided with a connecting groove that connects the first annular groove and the second annular groove. The connecting groove is parallel to the axis of the first cylindrical body.

[0010] A drive sleeve is adapted to be embedded inside the first cylinder, and the drive sleeve moves up and down relative to the first cylinder, with a protruding drive pin fixed inside the drive sleeve.

[0011] A first column is adapted to pass through the drive sleeve, and the lower end of the first column is connected to the pressure plate. A spiral groove is provided on the annular surface of the first column, and the drive pin is adapted to be embedded in the spiral groove. A protruding guide portion is provided on the lower side of the first column, and the guide portion is adapted to be embedded in the first annular groove, the second annular groove and the connecting groove for movement.

[0012] The second institution includes;

[0013] The second cylinder is restricted to rotate relative to the fixed frame, and the second cylinder has an inclined groove on its annular surface;

[0014] The second column is adapted to pass through the second cylinder, the lower end of the second column is connected to the cutting knife, and a protruding follower pin is provided below the surface of the second column, the follower pin being adapted to pass into the inclined groove;

[0015] The transmission mechanism includes:

[0016] A prism, which is fixed to the upper end of the first prism;

[0017] The first transmission wheel is restricted to rotate above the fixed frame, and a through connecting hole is provided at the center of the first transmission wheel. The connecting hole is a polygonal hole adapted to the prism, and the prism passes through the connecting hole with a clearance fit.

[0018] The second drive wheel is fixed to the second cylinder and is connected to the first drive wheel in a driving connection.

[0019] In a possible implementation of the first aspect, the side of the drive sleeve is provided with a countersunk hole with an internal thread, and the drive pin is provided with an external thread that is adapted to be screwed into the internal thread of the countersunk hole, so that the drive pin protrudes from the inner wall of the drive sleeve and the drive pin is embedded in the spiral groove of the first column.

[0020] In one possible implementation of the first aspect, the first cylinder is divided along a radial dividing surface to form two semi-circular side cylinders, and the two side cylinders are connected and fixed by through screws.

[0021] In one possible implementation of the first aspect, the upper end of the first cylinder is inserted into and fixed to a cylinder hoop, which is fixed to a fixing frame.

[0022] In one possible implementation of the first aspect, a connecting frame is fixed on the fixing frame, a tubular boss is fixed on the upper surface of the first transmission wheel, a bearing seat is fixed inside the connecting frame, and the boss is assembled and fixed to the bearing seat.

[0023] In a possible implementation of the first aspect, a connecting frame is fixed on the fixing frame, a drive cylinder is fixed inside the connecting frame, a connecting member is fixed below the piston rod of the drive cylinder, and the connecting member is fixed to the upper end of the drive sleeve.

[0024] In one possible implementation of the first aspect, the second mechanism further includes a limiting pin, which is fixed relative to the fixing frame, and a vertical limiting groove is provided above the surface of the second column, into which the limiting pin is embedded.

[0025] In a possible implementation of the first aspect, the first cylinder is connected to elastically movable blocking pins in both the first annular groove and the second annular groove. When the guide portion is parallel to the connecting groove, the blocking pin in the first annular groove is located on the side of the guide portion in the reverse direction, and the blocking pin in the second annular groove is located on the side of the guide portion in the forward direction. An inclined guide surface is provided on the side of the guide portion. When the guide portion is in the first annular groove and rotates forward, the guide surface is attached to the blocking pin and squeezes the blocking pin so that the guide portion passes through the blocking pin. When the guide portion is in the second annular groove and rotates in reverse, the guide surface is attached to the blocking pin and squeezes the blocking pin so that the guide portion passes through the blocking pin.

[0026] In one possible implementation of the first aspect, the first cylinder has a countersunk hole at the location where the blocking pin is set. The diameter of the countersunk hole at the end near the inside of the first cylinder is larger than the diameter at the end near the outside of the first cylinder. One end of the blocking pin has a reduced diameter section. A spring is fitted over the reduced diameter section. After passing through the countersunk hole inside the first cylinder, the reduced diameter section is connected to a limiting part outside the first cylinder. The outer diameter of the limiting part is larger than the diameter at the end of the countersunk hole near the outside of the first cylinder.

[0027] Secondly, the present invention also provides a computerized flat knitting machine, on which the above-mentioned device is provided, wherein the computerized flat knitting machine is provided with a base frame for supporting the needle plate, the fixing frame is fixed to the base frame, and the yarn passes through the cutter and the pressure plate in sequence and is connected to the yarn feeder of the computerized flat knitting machine.

[0028] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: The present invention achieves the time-sequential action of the pressure plate and the cutting knife through the linkage triggered by the lifting and lowering of the drive sleeve. That is, when the drive sleeve descends, the drive pin of the first mechanism first pushes the spiral groove of the first column to move downward, so that the guide part of the first column slides from the first annular groove into the second annular groove, thereby driving the pressure plate to descend first to press the yarn; subsequently, the second sleeve rotates, causing the inclined groove to drive the driven pin of the second column to descend, forcing the cutting knife to descend synchronously, forming a time difference of pressing first and then cutting. This design continuously fixes the yarn with the pressure plate until the cutting is completed, effectively suppressing the elastic recoil of the yarn at the moment of cutting and eliminating the problem of yarn springback during the weaving process. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0030] Figure 2 for Figure 1 A magnified diagram of point A in the middle.

[0031] Figure 3 for Figure 1 A cross-sectional view along the BB direction.

[0032] Figure 4 for Figure 3 A magnified diagram of point C.

[0033] Figure 5 for Figure 3 A magnified diagram of point D in the middle.

[0034] Figure 6 This is a three-dimensional structural diagram of the first mechanism.

[0035] Figure 7 A schematic diagram showing the first mechanism with the hoop and one side of the cylinder hidden.

[0036] Figure 8 for Figure 7 A magnified diagram at point E in the middle.

[0037] Figure 9 This is a schematic diagram of the three-dimensional structure of the first column.

[0038] Figure 10 This is a schematic diagram of the three-dimensional structure of the side cylinder.

[0039] Figure 11 This is a three-dimensional structural diagram showing the connection between the first column and the drive sleeve at the lower end of the side cylinder.

[0040] Figure 12 This is a cross-sectional structural diagram of the first mechanism.

[0041] Figure 13 for Figure 12 A cross-sectional view along the FF direction.

[0042] Figure 14 for Figure 13 A magnified diagram of point G in the middle.

[0043] Figure 15 This is a schematic diagram of the front of the second mechanism.

[0044] Figure 16 A schematic diagram of a computerized flat knitting machine for setting up the device of the present invention.

[0045] Figure 17 This is a cross-sectional schematic diagram of the portion of the computerized flat knitting machine on the base plate for setting up the device of the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0047] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0048] Furthermore, in this application, directional terms such as "upper" and "lower" are defined relative to the indicated placement of the components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of the components in the accompanying drawings.

[0049] This invention provides a yarn cutting device, as shown in the attached figure. Figure 1 and 3 As shown, the device includes a fixed frame 1, a pressure plate 2, a cutter 3, a first mechanism, and a second mechanism. The pressure plate 2 and the cutter 3 are positioned below the fixed frame 1, and both are restricted to vertical movement relative to the fixed frame 1. The yarn conveying path passes sequentially below the cutter 3 and below the pressure plate 2. The first mechanism drives the pressure plate 2 to perform a lifting and lowering action to hold the yarn, and the second mechanism drives the cutter 3 to perform a lifting and lowering action to cut the yarn.

[0050] As attached Figure 1As shown, the structure for the pressure plate 2 and the cutter 3 to rise and fall relative to the fixed frame 1 can be such that guide holes (not shown in the attached figure) are provided at corresponding positions on both sides of the fixed frame 1, and guide posts 13 are fixed on both sides above the pressure plate 2 and the cutter 3 respectively. The guide posts 13 on both sides are adapted to pass through the guide holes on both sides of the fixed frame 1, thereby constraining and guiding the rising and falling path of the pressure plate 2 and the cutter 3, ensuring that the rising and falling process is smooth and without deviation, avoiding motion interference and improving the reliability of the action.

[0051] As attached Figures 2 to 4 As shown, the first mechanism includes a first cylinder 41, a drive sleeve 42, and a first column 43. The first cylinder 41 is fixed to a fixed frame 1, and the drive sleeve 42 is fitted and embedded inside the first cylinder 41, performing a lifting motion relative to the first cylinder 41. The lifting motion can be driven by a connecting frame 11 fixed to the fixed frame 1, with a drive cylinder 44 fixed inside the connecting frame 11. The drive cylinder 44 can be an actuator such as a cylinder with a piston rod or an electric push rod. A connecting piece 441 is fixed below the piston rod of the drive cylinder 44, and the connecting piece 441 is fixed to the upper end of the drive sleeve 42. The lifting of the piston rod of the drive cylinder 44 drives the drive sleeve 42 to automatically lift and lower.

[0052] As attached Figures 7 to 9 As shown, a protruding drive pin 421 is also fixed inside the drive sleeve 42. The first column 43 is adapted to pass through the drive sleeve 42. The first column 43 has a spiral groove 431 on its circumferential surface, and the drive pin 421 is fitted into the spiral groove 431 with a clearance fit. At the same time, the lower end of the first column 43 is connected to the pressure plate 2, so that the first column 43 can rotate relative to the pressure plate 2, as shown in the attached figure. Figure 4 As shown, a mounting shaft 21 can be provided on the pressure plate 2. The upper end of the mounting shaft 21 forms a shoulder. After the bearing is embedded in the shoulder of the mounting shaft 21, a retaining ring is then installed on the bearing to limit the bearing. A bearing position is provided at the lower end of the first column 43. The bearing on the mounting shaft 21 is embedded in the bearing position and a retaining ring is installed to restrict the bearing within the bearing position, so that the first column 43 is axially fixed relative to the pressure plate 2 and can rotate relative to it.

[0053] As attached Figure 10 As shown, the inner wall of the first cylindrical body 41 is provided with a first annular groove 411 and a second annular groove 412, and two parallel connecting grooves 413 are also provided between the first annular groove 411 and the second annular groove 412 on the inner wall of the first cylindrical body 41. The connecting grooves 413 connect the first annular groove 411 and the second annular groove 412, and the connecting grooves 413 are parallel to the axis of the first cylindrical body 41. Preferably, the first cylindrical body 41 is cut along a radial dividing surface to form two semi-circular side cylindrical bodies, and the two side cylindrical bodies can be connected and fixed by through screws. Alternatively, the side cylindrical bodies can be connected and fixed by means of, as shown in the attached figure. Figure 6The shown cylindrical clamp 45 is used for connection and fixation. Specifically, the cylindrical clamp 45 is provided with mounting holes. After the two side cylinders are combined, they are fitted into the cylindrical clamp 45. The first screw is inserted into the cylindrical clamp 45 from the outside to the inside and locked into the side cylinder, so that both side cylinders are fixed to the cylindrical clamp 45 to form a complete first cylinder 41. The bottom of the cylindrical clamp 45 is then inserted upwards to the fixing frame 1, so that the cylindrical clamp 45 is fixed to the fixing frame 1, and the first cylinder 41 is also fixed to the fixing frame 1. The above split structure that divides the first cylinder 41 into two halves can significantly simplify the processing of the first annular groove 411, the second annular groove 412 and the connecting groove 413, and facilitate the insertion operation of the drive sleeve 42 and the first column 43, effectively improving manufacturing efficiency and reducing assembly difficulty.

[0054] Continue to refer to the appendix Figure 9 Both sides of the lower end of the first column 43 are provided with protruding guide portions 432. The guide portions 432 are adapted to be embedded in the first annular groove 411, the second annular groove 412 and the connecting groove 413 for movement. That is, the height of the guide portions 432 is close to the width of the first annular groove 411 and the second annular groove 412, the distance between the two guide portions 432 is close to the distance between the two connecting grooves 413 on both sides inside the first cylinder 41, and the width of the two guide portions is close to the width of the connecting groove 413. The "closeness" mentioned here refers to the clearance fit tolerance of the movable guide portions 432. When the drive sleeve 42 performs the lifting movement, since the guide portions 432 are restricted within the first annular groove 411, the second annular groove 412 and the connecting groove 413, the first column 43 can only perform synchronous movement and rotation during the process of the drive pin 421 pushing the spiral groove 431. Specifically, when the drive sleeve 42 descends, the drive pin 421 pushes the spiral groove 431 to drive the first column 43 to descend, while the guide part 432 moves downward from the first annular groove 411 along the connecting groove 413 to the second annular groove 412. At this time, the first column 43 completes its descent. When the guide part 432 reaches the bottom of the second annular groove 412, the drive pin 421 continues to push the spiral groove 431 to force the first column 43 to rotate 180°. Subsequently, when the drive sleeve 42 rises, the drive pin 421 pushes the spiral groove 431 to drive the guide part 432 to move upward from the second annular groove 412 along the connecting groove 413 to the first annular groove 411. At this time, the first column 43 completes its ascent. When the guide part 432 rises to the top of the first annular groove 411, the drive pin 421 continues to push the spiral groove 431 to force the first column 43 to reverse 180° and return to its initial state. Based on the above motion mechanism, the single lifting cycle of the drive sleeve 42 drives the first column 43 to complete the descent, 180° rotation, rise and 180° reverse reset in sequence, thereby controlling the pressure plate 2 to reliably reset after descending and pressing the yarn, ensuring the cyclicity of the pressing action and the stability of the process.

[0055] Please refer to the appendix. Figures 11 to 14The first cylindrical body 41 is connected to elastically movable blocking pins 414 in both the first annular groove 411 and the second annular groove 412. The connection method can be as follows: the first cylindrical body 41 has a countersunk hole at the location where the blocking pins 414 are set. The diameter of the countersunk hole at the end near the inside of the first cylindrical body 41 is larger than the diameter at the end near the outside of the first cylindrical body 41. One end of the blocking pin 414 has a reduced diameter section, and a spring 415 is fitted over this reduced diameter section. The two ends of the spring 415 abut against the countersunk hole and the blocking pin 414 respectively, causing the elastic force generated by the spring 415 to push the blocking pin 414 into the first cylindrical body 41. After passing through the countersunk hole inside the first cylindrical body 41, the reduced diameter section is connected to a limiting part 416 on the outside of the first cylindrical body 41. The limiting part 416 can be a nut threadedly connected to the end of the reduced diameter section. The outer diameter of the limiting part 416 is larger than the diameter of the countersunk hole near the outer end of the first cylinder 41, thereby limiting the displacement range of the blocking pin 414 to prevent the spring 415 from pushing it away from the countersunk hole.

[0056] The specific positions of the two blocking pins 414 are as follows: when the guide portion 432 is parallel to the connecting groove 413, the blocking pin 414 in the first annular groove 411 is located on the side of the guide portion 432 in the reverse direction, and the blocking pin 414 in the second annular groove 412 is located on the side of the forward direction. The side of the guide portion 432 is provided with an inclined guide surface. When the guide portion 432 is in the first annular groove 411 and rotates forward, the guide surface is attached to the blocking pin 414 and squeezes the blocking pin 414 to move outward from the first cylinder 41. After the guide portion 432 passes the blocking pin 414, the blocking pin 414 returns to the side of the guide portion 432 in the reverse direction, so that the blocking pin 414 is located on the side of the guide portion 432 in the reverse direction, thus preventing the first column 43 from rotating when the drive sleeve 42 pulls the first column 43 upward. When the guide part 432 reverses within the second annular groove 412, the guide surface adheres to the blocking pin 414, pressing the blocking pin 414 to move outward from the first cylinder 41. After the guide part 432 passes the blocking pin 414, the blocking pin 414 returns to its original position in the forward rotation direction of the guide part 432, preventing the first column 43 from rotating when the drive sleeve 42 pushes it downward. This two blocking pin 414 structures, through elastic limiting and the coordinated action of the guide slope, forcibly restrict the first column 43 to only perform vertical lifting and lowering movements after completing a 180° rotation, completely eliminating the risk of unexpected rotation and ensuring the reliability of the lifting and lowering action.

[0057] As attached Figure 3 and 15As shown, the second mechanism includes a second cylindrical body 51 and a second column 52. The second cylindrical body 51 is restricted to rotate relative to the fixed frame 1. Specifically, a bearing seat can be fixed to the fixed frame 1, and the second cylindrical body 51 is assembled to the bearing seat to form a vertical state relative to the fixed frame 1. A slanted groove 511 is provided below the annular surface of the second cylindrical body 51. The second column 52 is adapted to pass through the second cylindrical body 51, and a protruding driven pin 521 is provided below the surface of the second column 52. The driven pin 521 is adapted to pass through the slanted groove 511 and is restricted to move along the slanted groove 511. In the initial state, the driven pin 521 is located at the upper end of the slanted groove 511. When the first cylindrical body 41 rotates, the driven pin 521 is driven downward through the slanted groove 511, thereby driving the cutter 3 downward to cut the yarn.

[0058] Furthermore, please refer to the appendix. Figure 5 The second mechanism also includes a limiting pin 53, which is fixed relative to the fixed frame 1. The fixing method can be that a crossbar 12 is fixed inside the connecting frame 11, and the end of the limiting pin 53 away from the second column 52 is fixed to the crossbar 12. A vertical limiting groove 522 is provided above the surface of the second column 52, and the limiting pin 53 is embedded in the limiting groove 522 to restrict the second column 52 to only be able to move vertically and not rotate circumferentially.

[0059] Continue to refer to the appendix Figure 3The transmission mechanism includes a first transmission wheel 61, a second transmission wheel 62, and a prism 63. The first transmission wheel 61 is restricted to rotate above the fixed frame 1. This restriction can be achieved by fixing a tubular boss 611 to the upper surface of the first transmission wheel 61, and fixing a bearing seat 14 to the upper part of the connecting frame 11, thus restricting the first transmission wheel 61. The second transmission wheel 62 is fixed to the second cylinder 51 and is connected to the first transmission wheel 61. Specifically, the first transmission wheel 61 and the second transmission wheel 62 can be gears, and they mesh to form a transmission. The prism 63 is fixed to the upper end of the first column 43. A through-hole is provided at the center of the first transmission wheel 61. The through-hole is a polygonal hole adapted to the prism 63, and the prism 63 passes through the through-hole with a clearance fit. This allows the first transmission wheel 61 to rotate when the first column 43 rotates, without affecting the lifting and lowering of the first column 43. This structure allows the first column 43 to rotate synchronously with the second cylinder 51 via the transmission of the first drive wheel 61 and the second drive wheel 62. Through a linkage design, this transmission mechanism ensures that when the drive sleeve 42 lowers the first column 43, the pressure plate 2 first lowers to press down on the yarn. Then, the rotation of the first column 43, linked by the transmission mechanism, drives the second cylinder 51 to rotate, driving the cutter 3 to descend and cut the yarn. Finally, when the drive sleeve 42 raises the first column 43 and reverses direction, the transmission mechanism drives the second cylinder 51 to reverse direction, reliably raising and resetting the cutter 3. This achieves synchronized and precise control of the pressing and cutting actions, significantly improving yarn processing efficiency and operational reliability.

[0060] In addition, the present invention also provides a computerized flat knitting machine, as shown in the attached figure. Figure 16 and 17 As shown, the computerized flat knitting machine is equipped with the aforementioned device. The machine has a base frame 71 that supports the needle plate 72. A fixing frame 1 is fixed to the base frame 71. The yarn feed path passes sequentially below the cutter 3 and below the pressure plate 2, ultimately connecting to the yarn feed nozzle of the machine. Preferably, guide rollers 73 are provided on both sides of the fixing frame 1 on the base frame 71, and a base plate 74 is also fixed to the base frame 71. The yarn passes over the two guide rollers 73 and above the base frame 71. During operation, the computerized flat knitting machine uses the aforementioned device to cut the yarn as follows:

[0061] When the drive cylinder 44 is started, its telescopic rod drives the drive sleeve 42 to descend. The descent of the drive sleeve 42 pushes the spiral groove 431 of the first column 43 through the drive pin 421, thereby causing the first column 43 to descend. This causes the guide part 432 to move downward from the first annular groove 411 along the connecting groove 413 to abut against the bottom surface of the second annular groove 412, completing the descent of the first column 43. Simultaneously, the pressure plate 2 moves downward to press the yarn onto the base plate 74 of the computer flat knitting machine.

[0062] The drive pin 421 continues to push the spiral groove 431, forcing the first column 43 to rotate 180°. During this process, the rotation of the first column 43 drives the prism 63 to rotate. The prism 63 drives the first transmission wheel 61 to rotate through the connecting hole. The rotation of the first transmission wheel 61 drives the second transmission wheel 62 to rotate. The rotation of the second transmission wheel 62 drives the second cylinder 51 to rotate. The rotation of the second cylinder 51 causes the inclined groove 511 to drive the driven pin 521 to slide downward. The downward sliding of the driven pin 521 drives the second column 52 to descend, causing the cutter 3 to move downward to cut the yarn.

[0063] When the drive cylinder 44 reverses, it drives the drive sleeve 42 to rise. As the drive sleeve 42 rises, the drive pin 421 pushes the spiral groove 431 of the first column 43, causing the first column 43 to rise. This causes the guide part 432 to move upward from the second annular groove 412 along the connecting groove 413 to the top surface of the first annular groove 411, completing the upward movement of the first column 43 and simultaneously driving the pressure plate 2 to move upward.

[0064] The drive pin 421 continues to push the spiral groove 431, forcing the first column 43 to reverse 180° to reset. During the process, the first column 43 reverses and drives the second cylinder 51 to reverse through the transmission mechanism. The reverse rotation of the second cylinder 51 causes the inclined groove 511 to drive the driven pin 521 to slide upward. The driven pin 521 slides upward and drives the second column 52 to rise, causing the cutter 3 to move upward and reset.

[0065] The above method involves driving the drive sleeve 42 to lift and lower the first column 43, which in turn lowers the pressure plate 2 to press the yarn, effectively preventing the yarn from springing back and shifting during subsequent cutting. Then, the first column 43 rotates 180° and drives the second bobbin 51 to rotate via the transmission mechanism. The cutter 3 is precisely controlled to cut the yarn through the cooperation of the inclined groove 511 and the driven pin 521. Finally, the drive sleeve 42 rises, causing the first column 43 to reset and reverse 180°, simultaneously driving the cutter 3 to rise and reset. This achieves full-process sequential coordination of pressing to prevent springback and cutting reset, significantly improving the stability of yarn processing and cutting accuracy.

[0066] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A yarn cutting device, characterized in that, The device comprises a fixed frame, a pressing plate, a cutting knife, a first mechanism, a second mechanism and a transmission mechanism, and the yarn is connected to the yarn feeding nozzle of the flat knitting machine through the cutting knife and the pressing plate in sequence; The pressing plate and the cutting knife are arranged below the fixed frame, and both are limited to vertically lift relative to the fixed frame; The first mechanism comprises: A first cylinder is fixed to the fixed frame, the inner wall of the first cylinder is provided with a first annular groove and a second annular groove, and the inner wall of the first cylinder is further provided with a connecting groove connecting the first annular groove and the second annular groove, the connecting groove and the axis of the first cylinder are parallel; A driving sleeve is adapted to be embedded inside the first cylinder, and the driving sleeve is lifted relative to the first cylinder, the driving sleeve is fixed with a protruding driving pin inside; A first column is adapted to pass through the driving sleeve, and the lower end of the first column is connected to the pressing plate, the annular surface of the first column is provided with a spiral groove, the driving pin is adapted to be embedded in the spiral groove, the lower end of the first column is provided with a protruding guide part, and the guide part is adapted to be embedded in the first annular groove, the second annular groove and the connecting groove; The second mechanism comprises: A second cylinder is limited to rotate relative to the fixed frame, and the annular surface of the second cylinder is provided with an inclined groove; A second column is adapted to pass through the second cylinder, the lower end of the second column is connected to the cutting knife, and the lower surface of the surface of the second column is provided with a protruding driven pin, and the driven pin is adapted to penetrate into the inclined groove; The transmission mechanism comprises: A prism is fixed to the upper end of the first column; A first transmission wheel is limited to rotate above the fixed frame, and the center of the first transmission wheel is provided with a through connecting hole, the connecting hole is a polygonal hole adapted to the prism, and the prism is clearance fitted through the connecting hole; A second transmission wheel is fixed to the second cylinder, and the second transmission wheel and the first transmission wheel are transmission connected.

2. The apparatus of claim 1, wherein, The side surface of the driving sleeve is provided with a countersunk hole, the countersunk hole is provided with internal threads, the driving pin is provided with external threads, the external threads are adapted to be screwed into the internal threads of the countersunk hole, the driving pin is protruded from the inner wall of the driving sleeve, and the driving pin is embedded into the spiral groove of the first column.

3. The apparatus of claim 1, wherein, The first cylinder is cut along the radial division surface to form two semicircular side cylinders, and the two side cylinders are fixed by threaded screws.

4. The apparatus of claim 1 or 3, wherein The upper end of the first cylinder penetrates and is fixed to a cylinder hoop, and the cylinder hoop is fixed to the fixed frame.

5. The apparatus of claim 1, wherein, A connecting frame is fixed to the fixed frame, the upper surface of the first transmission wheel is fixed with a tubular boss, an upper bearing seat is fixed in the connecting frame, and the boss is assembled and fixed to the bearing seat.

6. The apparatus of claim 1, wherein, A connecting frame is fixed to the fixed frame, a driving cylinder is fixed in the connecting frame, a connecting piece is fixed to the lower end of the piston rod of the driving cylinder, and the connecting piece is fixed to the upper end of the driving sleeve.

7. The apparatus of claim 1, wherein, The second mechanism further comprises a limiting pin fixed relative to the fixed frame, and a vertical limiting slot is arranged above the surface of the second column, and the limiting pin is embedded into the limiting slot.

8. The apparatus of claim 1, wherein, The first cylinder is connected with an elastically movable blocking pin in the first annular groove and the second annular groove; when the guide portion is parallel to the connecting groove, the blocking pin in the first annular groove is located on one side of the reverse direction of the guide portion, and the blocking pin in the second annular groove is located on one side of the forward direction of the guide portion; the side of the guide portion is provided with an inclined guide surface; when the guide portion is forward in the first annular groove, the guide surface is attached to the blocking pin and extrudes the blocking pin to make the guide portion pass through the blocking pin; when the guide portion is reversed in the second annular groove, the guide surface is attached to the blocking pin and extrudes the blocking pin to make the guide portion pass through the blocking pin.

9. The apparatus of claim 8, wherein, The first cylinder is provided with a counterbore at the position of the blocking pin, the aperture of the counterbore close to the inner end of the first cylinder is larger than the aperture of the counterbore close to the outer end of the first cylinder, one end of the blocking pin is provided with a reduced diameter section, the reduced diameter section is sleeved with a spring, and the reduced diameter section passes through the counterbore in the first cylinder and is connected with a limiting portion outside the first cylinder, the outer diameter of the limiting portion is larger than the aperture of the counterbore close to the outer end of the first cylinder.

10. A computerized flat knitting machine characterized in that, The computerized flat knitting machine is provided with the device according to any one of claims 1 to 9; wherein the computerized flat knitting machine is provided with a base frame for bearing a needle plate, the fixed frame is fixed to the base frame, and the yarn passes through the cutter and the pressing plate in sequence and is connected to a yarn feeding nozzle of the computerized flat knitting machine.

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