Constant tension yarn feeding mechanism for a flat knitting machine

Abstract

The utility model provides a kind of constant-tension yarn feeding mechanism for flat knitting machine, it is related to textile machinery technical field, including main frame, feed roll and top frame, the bottom pay-off mechanism of main frame, the one side rotationally connected with rotating arm in top frame top, the one end of rotating arm is hinged with No. 2 pulley, the top of rotating arm one end is hinged with rotating rod, the one end of rotating rod is hinged with No. 1 pulley, rotating mechanism matched with rotating rod is equipped on rotating arm, the top of top frame is equipped with matching adjusting mechanism with rotating arm;The output end of the utility model pneumatic cylinder can drive connecting link linear motion, connecting link is driven rotating arm to rotate with the one side of top frame top as center by sliding block, rotating rod and No. 2 pulley are all installed on rotating arm, yarn changes position following rotating arm, to change yarn feeding point, to keep the tension balance of yarn, to solve the prior art, it is difficult to change feeding point directly, a little carelessness can affect tension balance, leading to the problem of decline in knitting quality.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, and in particular to a constant tension yarn feeding mechanism for a flat knitting machine. Background Technology

[0002] The constant tension yarn feeding mechanism for flat knitting machines is a key component in textile machinery. It is designed to solve the problem of yarn tension fluctuation during the knitting process. It drives the yarn feeding wheel through a stepper motor or servo motor, and works with a tension sensor to monitor and automatically adjust the yarn feeding speed in real time to ensure constant yarn tension.

[0003] While constant tension yarn feeding mechanisms for flat knitting machines excel at ensuring stable yarn tension, they present challenges in adjusting the yarn feed position. Their compact structure, fixed layout of components like the yarn feed roller and guide plate, and limited operating space make it difficult to manually change the yarn feed point. Furthermore, different yarns and knitting processes have varying requirements for the yarn feed position, necessitating meticulous operation for each adjustment. Even slight errors can affect tension balance, leading to a decline in knitting quality. Therefore, this invention proposes a constant tension yarn feeding mechanism for flat knitting machines to address these issues. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a constant tension yarn feeding mechanism for flat knitting machines. This mechanism solves the problems of existing technologies where the structure is compact, the layout of components such as the yarn feeding wheel and the yarn guide plate is fixed, the operating space is limited, it is difficult to directly and manually change the yarn feeding point, and slight carelessness may affect the tension balance, leading to a decline in knitting quality.

[0005] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a constant tension yarn feeding mechanism for a flat knitting machine, including a main frame, a feeding roller and a top frame, wherein the bottom of the main frame has a yarn feeding mechanism, on which a feeding roller is installed, the top of the main frame is fixedly connected, a rotating arm is rotatably connected to one side of the top of the top frame, a second pulley is hinged to one end of the rotating arm, a rotating rod is hinged to the top of one end of the rotating arm, a first pulley is hinged to one end of the rotating rod, a rotating mechanism matching the rotating rod is provided on the rotating arm, and an adjustment mechanism matching the rotating arm is provided on the top of the top frame.

[0006] A further improvement is that the adjustment mechanism includes a slider, a cylinder, and a connecting section. The top of the rotating arm is slidably connected to the slider, and a cylinder is fixedly installed on one side of the top frame. The output end of the cylinder is fixedly connected to the connecting section, and the bottom end of the connecting section is hinged to the top end of the slider.

[0007] A further improvement is that: one end of the rotating arm is provided with a strip groove, a fixing bolt is inserted inside the strip groove, one end of the fixing bolt is hinged to a No. 3 pulley, and the other end of the fixing bolt is threaded to a nut.

[0008] A further improvement is that a cylindrical block is fixedly connected to the top of one end of the rotating arm, and an arc-shaped groove is provided on the top of the top frame, with the outer wall of the cylindrical block fitting and connected to the inner wall of the arc-shaped groove.

[0009] A further improvement is made in that: the rotating mechanism includes a drive block, a worm gear, a worm, and a connecting shaft. The drive block is fixedly installed on the back of the top of the rotating arm. The worm gear and the worm are symmetrically rotatably connected on both sides inside the drive block. The outer walls of the worm gear and the worm mesh with each other. The worm gear is fixedly connected to one end of the rotating rod through the connecting shaft. A rotary motor is fixedly installed on one side of the bottom of the drive block. The output end of the rotary motor is fixedly connected to one end of the worm.

[0010] Further improvements are made in that: the wire feeding mechanism includes a spline shaft, a spline groove, a connecting bolt, a fixing cover and a drive motor. The drive motor is fixedly installed on one side of the bottom of the main frame. The output end of the drive motor is fixedly connected to the spline shaft. The inside of the feeding roller is provided with a spline groove. The feeding roller is engaged with the outside of the spline shaft through the spline groove. One end of the spline shaft is fixedly connected to a connecting bolt. The outside of the connecting bolt is threadedly connected to a fixing cover.

[0011] A further improvement is that the main frame is equipped with a control mechanism that matches the rotary motor, and the control mechanism includes a tension sensing device and a microcontroller.

[0012] The beneficial effects of this utility model are as follows: the output end of the cylinder can drive the connecting section to move linearly, and the connecting section drives the rotating arm to rotate around one side of the top of the top frame as the center through the slider. The rotating rod and the second pulley are both installed on the rotating arm. The yarn changes position with the rotating arm to change the yarn inlet point in order to maintain the yarn tension balance. This solves the problem in the prior art that it is difficult to directly change the yarn inlet point, and the tension balance may be affected if not careful, resulting in a decrease in weaving quality. Attached Figure Description

[0013] Figure 1 This is the front view of the present invention;

[0014] Figure 2 This is a schematic diagram of the adjustment mechanism structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the rotating arm structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the feeding roller assembly of this utility model;

[0017] Figure 5 This is a schematic diagram of the rotating mechanism structure of this utility model.

[0018] The components are as follows: 1. Main frame; 2. Feeding roller; 3. Top frame; 4. Rotating arm; 5. Rotating rod; 6. Pulley No. 1; 7. Pulley No. 2; 8. Slider; 9. Cylinder; 10. Connecting section; 11. Strip groove; 12. Pulley No. 3; 13. Drive block; 14. Worm gear; 15. Worm; 16. Connecting shaft; 17. Rotary motor; 18. Fixing bolt; 19. Splined shaft; 20. Splined groove; 21. Connecting bolt; 22. Fixing cover; 23. Drive motor. Detailed Implementation

[0019] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0020] according to Figures 1-5 As shown, this embodiment proposes a constant tension yarn feeding mechanism for a flat knitting machine, including a main frame 1, a feeding roller 2, and a top frame 3. The main frame 1 has a yarn feeding mechanism at its bottom, on which the feeding roller 2 is mounted. The top frame 3 is fixedly connected to the top of the main frame 1. A rotating arm 4 is rotatably connected to one side of the top of the top frame 3. A second pulley 7 is hinged to one end of the rotating arm 4, and a rotating rod 5 is hinged to the top of one end of the rotating arm 4. A first pulley 6 is hinged to one end of the rotating rod 5. The rotating arm 4 is equipped with a matching mechanism for the rotating rod 5. The rotating mechanism has an adjustment mechanism on the top of the top frame 3 that matches the rotating arm 4. The feeding roller 2 is fixed on the feeding mechanism, and the yarn on the feeding roller 2 is pulled to the outside of the second pulley 7 at one end of the rotating arm 4 and passes through the first pulley 6 at one end of the rotating rod 5. The rotating mechanism drives the rotating rod 5 to rotate and adjust the position of the first pulley 6. The first pulley 6 is used to tension the yarn, so that the yarn is transported stably. The adjustment mechanism drives the rotating arm 4 to rotate and adjust its position, changing the yarn entry point to maintain the tension balance of the yarn.

[0021] The adjustment mechanism includes a slider 8, a cylinder 9, and a connecting section 10. The top of the rotating arm 4 is slidably connected to the slider 8, and the cylinder 9 is fixedly installed on one side of the top frame 3. The output end of the cylinder 9 is fixedly connected to the connecting section 10. The bottom end of the connecting section 10 is hinged to the top end of the slider 8. The output end of the cylinder 9 can drive the connecting section 10 to move linearly. The connecting section 10 drives the rotating arm 4 to rotate around one side of the top of the top frame 3 through the slider 8. The rotating rod 5 and the second pulley 7 are both installed on the rotating arm 4. The yarn changes position with the rotating arm 4 to change the yarn entry point and maintain the tension balance of the yarn. The slider 8 can slide along the top of the rotating arm 4 to adjust its position and eliminate the interference between the connecting section 10 and itself.

[0022] One end of the rotating arm 4 is provided with a strip groove 11, and a fixing bolt 18 is inserted inside the strip groove 11. One end of the fixing bolt 18 is hinged to a third pulley 12, and the other end of the fixing bolt 18 is threaded with a nut. Loosening the nut at the other end of the fixing bolt 18 allows the fixing bolt 18 to slide linearly along the strip groove 11. Adjusting the position of the third pulley 12 so that it corresponds to the position of the first pulley 6 on the rotating rod 5 after rotation, and then locking the nut at the other end of the fixing bolt 18, the third pulley 12 and the first pulley 6 cooperate to make the yarn tension balanced.

[0023] A cylindrical block is fixedly connected to the top of one end of the rotating arm 4. An arc-shaped groove is provided on the top of the top frame 3. The outer wall of the cylindrical block is in close contact with the inner wall of the arc-shaped groove. The friction between the rotating arm 4 and the top frame 3 is reduced by the cylindrical block and the arc-shaped groove, making the rotating arm 4 rotate more smoothly.

[0024] The main frame 1 is equipped with a control mechanism that matches the rotary motor 17. The control mechanism includes a tension sensing device and a microcontroller. The rotary mechanism includes a drive block 13, a worm gear 14, a worm 15, and a connecting shaft 16. The drive block 13 is fixedly installed on the back of the top of the rotating arm 4. The worm gear 14 and the worm 15 are symmetrically rotatably connected to both sides inside the drive block 13. The outer walls of the worm gear 14 and the worm 15 mesh with each other. The worm gear 14 is fixedly connected to one end of the rotating rod 5 through the connecting shaft 16. The rotary motor is fixedly installed on one side of the bottom of the drive block 13. 17. The output end of the rotary motor 17 is fixedly connected to one end of the worm gear 15. The yarn passes through a tension sensing device such as a pressure sensor, and the tension change is converted into mechanical displacement or electrical signal. After the detection signal is filtered and amplified, it is subjected to PID calculation by a microcontroller such as a single-chip microcomputer or PLC to calculate the compensation amount. Then, the rotary motor 17 is controlled to drive the worm gear 15 to rotate. The worm gear 15 drives the connecting shaft 16 to rotate through the worm wheel 14. The connecting shaft 16 drives the rotating rod 5 to rotate, thereby changing the angle of the first pulley 6 and automatically adjusting the tension balance according to the yarn tension feedback.

[0025] The feeding mechanism includes a splined shaft 19, a splined groove 20, a connecting bolt 21, a fixing cover 22, and a drive motor 23. The drive motor 23 is fixedly installed on one side of the bottom of the main frame 1. The output end of the drive motor 23 is fixedly connected to the splined shaft 19. The feeding roller 2 has a splined groove 20 inside, and the feeding roller 2 is engaged with the outer side of the splined shaft 19 through the splined groove 20. One end of the splined shaft 19 is fixedly connected to the connecting bolt 21, and the outer side of the connecting bolt 21 is threaded with the fixing cover 22. The feeding roller 2 is inserted along the splined groove 20. To the outside of the spline shaft 19, initially clamp the feed roller 2 to the spline shaft 19 as one unit. Tighten the fixing cover 22 on the outside of the connecting bolt 21. Use the fixing cover 22 to clamp the feed roller 2 and fix the feed roller 2 on the spline shaft 19. The drive motor 23 can drive the feed roller 2 to rotate through the spline shaft 19. The feed roller 2 automatically feeds the yarn wound on its outside. After the yarn on the feed roller 2 is used up, unscrew the fixing cover 22 and pull the feed roller 2 out from the outside of the spline shaft 19. Install a new feed roller 2 with yarn in the same way as above.

[0026] This flat knitting machine uses a constant tension yarn feeding mechanism. The output end of cylinder 9 can drive the connecting section 10 to move linearly. The connecting section 10 drives the rotating arm 4 to rotate around one side of the top of the top frame 3 via the slider 8. The rotating rod 5 and the second pulley 7 are both installed on the rotating arm 4. The yarn changes position with the rotating arm 4 to change the yarn feeding point and maintain the tension balance of the yarn. This solves the problem in the existing technology that it is difficult to directly change the yarn feeding point, and the tension balance may be affected if not careful, resulting in a decrease in knitting quality.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A constant tension yarn feeding mechanism for a flat knitting machine, comprising a main frame (1), a feed roller (2), and a top frame (3), characterized in that: The main frame (1) has a bottom wire feeding mechanism, on which a feeding roller (2) is installed. The top of the main frame (1) is fixedly connected to a top frame (3). A rotating arm (4) is rotatably connected to one side of the top of the top frame (3). A second pulley (7) is hinged to one end of the rotating arm (4). A rotating rod (5) is hinged to the top of one end of the rotating arm (4). A first pulley (6) is hinged to one end of the rotating rod (5). A rotating mechanism matching the rotating rod (5) is provided on the rotating arm (4). An adjustment mechanism matching the rotating arm (4) is provided on the top of the top frame (3). The adjustment mechanism includes a slider (8), a cylinder (9) and a connecting section (10). The top of the rotating arm (4) is slidably connected to the slider (8), and the top frame (3) is fixedly installed with the cylinder (9) on one side. The output end of the cylinder (9) is fixedly connected to the connecting section (10), and the bottom end of the connecting section (10) is hinged to the top end of the slider (8).

2. The constant tension yarn feeding mechanism for a flat knitting machine according to claim 1, characterized in that: One end of the rotating arm (4) is provided with a strip groove (11), and a fixing bolt (18) is inserted inside the strip groove (11). One end of the fixing bolt (18) is hinged to a No. 3 pulley (12), and the other end of the fixing bolt (18) is threaded with a nut.

3. The constant tension yarn feeding mechanism for a flat knitting machine according to claim 1, characterized in that: A cylindrical block is fixedly connected to the top of one end of the rotating arm (4), and an arc groove is provided on the top of the top frame (3). The outer wall of the cylindrical block is fitted and connected to the inner wall of the arc groove.

4. The constant tension yarn feeding mechanism for a flat knitting machine according to claim 1, characterized in that: The rotating mechanism includes a drive block (13), a worm wheel (14), a worm (15), and a connecting shaft (16). The drive block (13) is fixedly installed on the back of the top of the rotating arm (4). The worm wheel (14) and the worm (15) are symmetrically rotated on both sides inside the drive block (13). The outer walls of the worm wheel (14) and the worm (15) mesh with each other. The worm wheel (14) is fixedly connected to one end of the rotating rod (5) through the connecting shaft (16). A rotary motor (17) is fixedly installed on one side of the bottom of the drive block (13). The output end of the rotary motor (17) is fixedly connected to one end of the worm (15).

5. A constant tension yarn feeding mechanism for a flat knitting machine according to claim 1, characterized in that: The wire feeding mechanism includes a spline shaft (19), a spline groove (20), a connecting bolt (21), a fixing cover (22), and a drive motor (23). The drive motor (23) is fixedly installed on one side of the bottom of the main frame (1). The output end of the drive motor (23) is fixedly connected to the spline shaft (19). The inside of the feeding roller (2) is provided with a spline groove (20). The feeding roller (2) is engaged with the outside of the spline shaft (19) through the spline groove (20). One end of the spline shaft (19) is fixedly connected to a connecting bolt (21). The outside of the connecting bolt (21) is threadedly connected to a fixing cover (22).

6. The constant tension yarn feeding mechanism for a flat knitting machine according to claim 4, characterized in that: The main frame (1) is equipped with a control mechanism that matches the rotary motor (17). The control mechanism includes a tension sensing device and a microcontroller.

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