Yarn slack preventing yarn feeding mechanism and circular knitting machine

Abstract

The utility model discloses a kind of yarn feeding mechanism and circular knitting machine of preventing yarn slackening, it is related to big round machine technical field, including yarn feeding assembly, yarn feeding assembly includes fixed frame, two symmetrical distribution fixed plates are fixedly connected in fixed frame top, and fixed plate and fixed frame top form acute angle included angle;Rotary connection is established between two fixed plates, and the outer side both ends of shaft are rotatably connected with swing arm, and the middle of shaft is equipped with protrusion, and torsion spring is fixedly connected between protrusion and two swing arms, and torsion spring is sleeved on the outer side of shaft.The yarn feeding mechanism and circular knitting machine of preventing yarn slackening, swing arm and fastening wheel structure driven by torsion spring, ensure that tension is constant, swing arm is increased pressure when slackening, reverse release when too tight, effectively avoid weaving defect, and torsion spring is adjusted fastening wheel pressure according to yarn tension dynamics, swing arm angle is controlled by handle through worm and worm mechanism, adapt to different yarn type or special process requirement.

Description

Technical Field

[0001] This utility model relates to the field of circular knitting machine technology, specifically to a yarn feeding mechanism for preventing yarn slack and a circular knitting machine. Background Technology

[0002] A circular knitting machine, also known as a circular knitting weft knitting machine or circular knitting weft machine, is a high-efficiency textile equipment used to produce cylindrical knitted fabrics. It weaves yarn into loops through circular motion to form double-sided or single-sided knitted fabrics. During operation, yarn slack can easily occur, affecting product quality.

[0003] To overcome the aforementioned shortcomings, Chinese patent (publication number: CN222961693U) discloses a yarn feeding mechanism for a circular knitting machine. It includes: a base, a cleaning component on top of the base, a dust-collecting component on top of the cleaning component, and an adjusting component located inside the base and at the bottom of the cleaning component. This yarn feeding mechanism for a circular knitting machine, through the coordinated arrangement of its various components, uses the meshing of a first bevel gear and a second bevel gear to drive the cleaning brush to rotate and clean dust and lint from the yarn surface. The dust collector then operates, using a suction pipe, a transfer plate, and a suction hood to collect the cleaned dust and lint, eliminating the need for manual cleaning and saving time and effort, greatly increasing the practicality of the device. Combined with the adjusting component, it prevents yarn slack and ensures stable yarn supply.

[0004] Traditional yarn feeding mechanisms rely on fixed tension devices, which cannot dynamically adapt to changes in yarn tension, easily leading to defects in fabric products. Furthermore, tension adjustment depends on experience, and manual adjustment is time-consuming and difficult to control precisely, affecting production efficiency and consistency. Utility Model Content

[0005] The purpose of this invention is to provide a yarn feeding mechanism and a circular knitting machine that prevents yarn slack, so as to solve the problem in the above-mentioned background technology that the traditional yarn feeding mechanism relies on a fixed tension device, cannot dynamically adapt to changes in yarn tension, and is prone to defects in fabric products.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a yarn feeding mechanism for preventing yarn slack, comprising a yarn feeding assembly, the yarn feeding assembly comprising a fixed frame, two symmetrically distributed fixed plates fixedly connected to the top of the fixed frame, the fixed plates forming an acute angle with the top of the fixed frame; a rotating shaft rotatably connected between the two fixed plates, swing arms rotatably connected to both ends of the outer side of the rotating shaft, a protrusion provided in the middle of the rotating shaft, and a torsion spring fixedly connected between the protrusion and the two swing arms, the torsion spring being sleeved on the outer side of the rotating shaft.

[0007] Preferably, the ends of the two swing arms away from the pivot are rotatably connected to a fastening wheel, and the fastening wheel has a groove with an annular structure in the middle, and the swing arm rotation range is ±45°.

[0008] Preferably, a worm gear is fixedly connected to one end of the rotating shaft, and the worm gear is located outside the fixed plate. The fixed plate is equipped with a drive shaft, and the end of the drive shaft is provided with a worm that meshes with the outside of the worm gear.

[0009] Preferably, a mounting shaft is fixedly connected to the outside of the fixing plate, a rotating sleeve is rotatably connected to the outside of the mounting shaft, and a drive shaft is rotatably connected inside the rotating sleeve, with the drive shaft and the rotating sleeve being perpendicularly distributed.

[0010] Preferably, a torsion spring is fitted on the outer side of the rotating sleeve, and the rotating sleeve drives the end of the drive shaft to rotate in the direction of the worm gear, and a handle is fixedly connected to the end of the drive shaft away from the worm gear.

[0011] Preferably, two parallel positioning rollers are rotatably connected between the two fixed plates, and two parallel elastic rollers are rotatably connected inside the fixed frame, with the gap between the two positioning rollers and the contact surfaces of the two elastic rollers aligned with each other.

[0012] Preferably, a rotational motion detector is fixedly connected to the bottom of the fixed frame, and a rotating wheel is fixedly connected to the input end of the rotational motion detector. A yarn inlet hole is fixedly connected to the bottom of the fixed frame.

[0013] A circular knitting machine includes a base placed on the ground. A first support is fixedly connected to the top of the base. A ring of equally spaced yarn feeding components is fixedly connected to the outer side of the bottom of the first support. A second support is installed on the top of the first support. A fixing ring is fixedly connected to the bottom of the second support through a connecting rod. An equally spaced yarn feeding component is fixedly connected to the bottom of the fixing ring, and each fixing ring corresponds to each yarn feeding component.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the yarn feeding mechanism and circular knitting machine that prevent yarn slack, through the swing arm and fastening wheel structure driven by the torsion spring, ensure constant tension. When slack, the swing arm rotates inward to increase pressure, and when too tight, it releases in the opposite direction, effectively avoiding weaving defects. The torsion spring dynamically adjusts the pressure of the fastening wheel according to the yarn tension. The worm gear mechanism controls the angle of the swing arm through the handle to adapt to different yarn types or special process requirements.

[0015] The torsion spring design of the rotating sleeve allows the drive shaft to quickly disengage from the worm gear, instantly releasing the tension lock for easy yarn replacement. After loosening, it automatically resets and engages. The rotational motion detector monitors the yarn movement in real time through the rotating wheel, triggering a stop in case of abnormality to prevent equipment damage or defective products caused by yarn breakage or loosening. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the fixed frame structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the elastic roller structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the rotating shaft structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the rotating sleeve structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the rotating sleeve structure of this utility model.

[0022] In the diagram: 1. Base; 2. First bracket; 3. Yarn feeding assembly; 4. Second bracket; 5. Fixing ring; 6. Yarn supply assembly; 7. Fixing frame; 8. Fixing plate; 9. Rotating shaft; 10. Swing arm; 11. Fastening wheel; 12. Worm gear; 13. Drive shaft; 14. Mounting shaft; 15. Rotating sleeve; 16. Positioning roller; 17. Elastic roller; 18. Rotary motion detector; 19. Rotating wheel; 20. Yarn feeding hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Please refer to Figure 1 - Figure 6This utility model provides the following technical solution: a yarn feeding mechanism for preventing yarn slack, including a yarn feeding assembly 3, the yarn feeding assembly 3 including a fixed frame 7, two symmetrically distributed fixed plates 8 fixedly connected to the top of the fixed frame 7, and the fixed plates 8 and the top of the fixed frame 7 forming an acute angle; a rotating shaft 9 is rotatably connected between the two fixed plates 8, and swing arms 10 are rotatably connected to both ends of the outer side of the rotating shaft 9, the rotating shaft 9 has a protrusion in the middle, and a torsion spring is fixedly connected between the protrusion and the two swing arms 10, and the torsion spring is sleeved on the outer side of the rotating shaft 9; a fastening wheel 11 is rotatably connected to the end of the two swing arms 10 away from the rotating shaft 9, and the fastening wheel 11 has an annular groove in the middle, and the rotation range of the swing arms 10 is ±45°; a worm gear 12 is fixedly connected to one end of the rotating shaft 9, and the worm gear 12 is located outside the fixed plate 8, the fixed plate 8 is equipped with a drive shaft 13, and the end of the drive shaft 13 is located outside the worm gear 12. The components include intermeshing worm gears; a mounting shaft 14 is fixedly connected to the outside of the fixed plate 8, a rotating sleeve 15 is rotatably connected to the outside of the mounting shaft 14, and a drive shaft 13 is rotatably connected inside the rotating sleeve 15, with the drive shaft 13 and the rotating sleeve 15 being perpendicularly distributed; a torsion spring is fitted on the outside of the rotating sleeve 15, and the rotating sleeve 15 drives the end of the drive shaft 13 to rotate toward the worm gear 12, with a handle fixedly connected to the end of the drive shaft 13 away from the worm gear 12; two parallel positioning rollers 16 are rotatably connected between the two fixed plates 8, and two parallel elastic rollers 17 are rotatably connected inside the fixed frame 7, with the gap between the two positioning rollers 16 and the contact surface of the two elastic rollers 17 aligned with each other; a rotational motion detector 18 is fixedly connected to the bottom of the fixed frame 7, and a rotating wheel 19 is fixedly connected to the input end of the rotational motion detector 18; a yarn inlet hole 20 is fixedly connected to the bottom of the fixed frame 7.

[0025] The yarn feeding assembly 3 includes a fixed frame 7, which is fixed on the first bracket 2 of the circular knitting machine as a support base. The fixed plate 8 forms an acute angle with the top of the fixed frame 7. The two outer ends of the rotating shaft 9 are respectively rotatably connected to two swing arms 10, so that the swing arms 10 can rotate around the rotating shaft 9. The rotation range is limited to ±45° to maintain stability and prevent over-adjustment.

[0026] The rotating shaft 9 has a raised structure in the middle, and a torsion spring is fixedly connected between the raised structure and the two swing arms 10. The torsion spring is directly sleeved on the outside of the rotating shaft 9. The function of the torsion spring is to provide constant elastic force. When the yarn tension changes, it can automatically drive the swing arms 10 to deflect to compensate for the tension. When the yarn slacks and the tension decreases, the torsion spring will push the swing arms 10 to rotate inward, thereby increasing the yarn tension. Conversely, it will act in the opposite direction to prevent excessive tightness. The ends of the two swing arms 10 away from the rotating shaft 9 are rotatably connected to the fastening wheel 11. The fastening wheel 11 has an annular groove in the middle. The groove is used to accommodate the yarn and fix it to prevent slippage. When the swing arms 10 are driven to rotate by the torsion spring, the fastening wheel 11 moves accordingly. By applying or releasing pressure through the groove that holds the yarn, automatic tension balance is achieved.

[0027] A worm gear 12 is fixedly connected to one end of the rotating shaft 9. The worm gear 12 is located on the outside of the fixed plate 8 for easy external operation. The fixed plate 8 is equipped with a drive shaft 13. A worm is provided at the end of the drive shaft 13. The worm meshes with the outside of the worm gear 12 to form a worm gear pair. A handle is fixedly connected to the end of the drive shaft 13 away from the worm gear 12. The operator can manually rotate the handle to operate the drive shaft 13. When manual intervention in tension is required, such as when the yarn type changes and the automatic adjustment is insufficient, the operator twists the drive shaft 13. The worm of the drive shaft 13 drives the worm gear 12 to rotate, thereby causing the rotating shaft 9 to rotate synchronously. The rotation of the rotating shaft 9 is transmitted to the swing arm 10 through the protrusion and the torsion spring, forcing the swing arm 10 to deflect within a range of ±45 degrees, driving the fastening wheel 11 to adjust the pressure on the yarn, thus completing the fine adjustment of tension.

[0028] A handle is fixed to the other end of the drive shaft 13. Rotating the handle drives the worm gear to rotate, which in turn drives the worm wheel 12 to rotate, thereby causing the entire rotating shaft 9 to rotate. The rotation of the rotating shaft 9 pushes the built-in torsion spring through the protruding structure on it, which in turn forces the swing arm 10 to deflect within a range of ±45°, causing the fastening wheel 11 to change the pressure on the yarn, thus achieving precise manual tension adjustment. At the same time, the drive shaft 13 is not rigidly fixed. A torsion spring is also fitted on the outside of the rotating sleeve 15. This spring ensures that the rotating sleeve 15 is always driven. The worm end of shaft 13 is biased towards the worm wheel 12 to ensure engagement. When it is necessary to quickly release the yarn, the handle end of drive shaft 13 can be turned to make drive shaft 13 rotate around the axis of rotating sleeve 15. This action will cause the worm at the end of drive shaft 13 to disengage from the worm wheel 12. Once disengaged, the locking of fastening wheel 11 and swing arm 10 is released, and the tension will drop instantly, making it easy to remove the yarn. After being released, the torsion spring on the outside of rotating sleeve 15 will automatically push drive shaft 13 back to its original position, and the worm and worm wheel 12 will re-engage.

[0029] The gap between the two positioning rollers 16 and the mating surfaces of the two elastic rollers 17 are aligned to ensure that the yarn path passes straight through the yarn feeding assembly 3. The yarn enters the fixed frame 7 from the outside through the yarn feeding hole 20, which is located at the bottom of the fixed frame 7. First, the yarn enters between the mating surfaces of the two elastic rollers 17. The elastic rollers 17 are designed with flexible surfaces to provide basic tension when the yarn is lightly pressed, while absorbing slight vibrations. Then, the yarn passes between the two positioning rollers 16. The positioning rollers 16 prevent the yarn from shifting and provide a smooth input for the subsequent tension adjustment of the fastening roller 11, preventing yarn fluctuations from interfering with the anti-slackening mechanism.

[0030] The yarn is wound around the outside of the rotating wheel 19. The yarn drives the rotating wheel 19 to rotate through the yarn inlet 20, and then passes through the elastic roller 17, the positioning roller 16 and the fastening roller 11. The rotational motion detector 18 continuously monitors the motion state of the rotating wheel 19. When the yarn supply is interrupted or slippage occurs due to severe slack, the rotating wheel 19 stops rotating or the speed is abnormal. The detector 18 will immediately sense this change in state and output an abnormal signal. This signal can be quickly transmitted to the control system of the circular knitting machine, automatically triggering a stop alarm or related protection actions, thereby effectively preventing weaving defects or even equipment damage caused by yarn slack or interruption.

[0031] Example 2: Based on Example 1, please refer to... Figure 1 The following structure was also disclosed: a circular knitting machine, including a base 1 placed on the ground, a first support 2 fixedly connected to the top of the base 1, yarn feeding components 3 with equal spacing distributed in a ring fixedly connected to the outer side of the bottom of the first support 2, a second support 4 installed on the top of the first support 2, a fixing ring 5 fixedly connected to the bottom of the second support 4 through a connecting rod, and yarn feeding components 6 with equal spacing fixedly connected to the bottom of the fixing ring 5, and each fixing ring 5 and each yarn feeding component 3 correspond one-to-one.

[0032] The bottom of the second bracket 4 is fixedly connected to a fixing ring 5 via a connecting rod. The bottom of the fixing ring 5 is fixedly connected to equally spaced yarn feeding components 6. Each yarn feeding component 3 provides yarn to the yarn feeding component 6, and each yarn feeding component 6 corresponds one-to-one with each yarn feeding component 3 to form a one-to-one yarn path. The yarn passes through the elastic roller 17, the positioning roller 16 and the fastening wheel 11 in sequence in the yarn feeding component 3, and is monitored by the rotational motion detector 18 at the same time.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A yarn feeding mechanism for preventing yarn slack and a circular knitting machine, comprising a yarn feeding assembly (3), wherein the yarn feeding assembly (3) includes a fixed frame (7), and two symmetrically distributed fixed plates (8) are fixedly connected to the top of the fixed frame (7), and the fixed plates (8) form an acute angle with the top of the fixed frame (7); characterized in that: A rotating shaft (9) is rotatably connected between the two fixed plates (8). Both ends of the rotating shaft (9) are rotatably connected to swing arms (10). A protrusion is provided in the middle of the rotating shaft (9), and a torsion spring is fixedly connected between the protrusion and the two swing arms (10). The torsion spring is sleeved on the outside of the rotating shaft (9).

2. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 1, characterized in that: The two swing arms (10) are rotatably connected to a fastening wheel (11) at one end away from the pivot (9), and the fastening wheel (11) has a groove with an annular structure in the middle, and the swing arm (10) has a rotation range of ±45°.

3. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 2, characterized in that: One end of the rotating shaft (9) is fixedly connected to a worm gear (12), and the worm gear (12) is located outside the fixed plate (8). The fixed plate (8) is equipped with a drive shaft (13), and the end of the drive shaft (13) is provided with a worm that meshes with the outside of the worm gear (12).

4. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 3, characterized in that: The mounting plate (8) is fixedly connected to the outside of the mounting shaft (14), and the mounting shaft (14) is rotatably connected to the outside of the rotating sleeve (15). The drive shaft (13) is rotatably connected inside the rotating sleeve (15), and the drive shaft (13) and the rotating sleeve (15) are vertically distributed.

5. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 4, characterized in that: The rotating sleeve (15) is fitted with a torsion spring on its outer side, and the rotating sleeve (15) drives the end of the drive shaft (13) to rotate toward the worm wheel (12), and a handle is fixedly connected to the end of the drive shaft (13) away from the worm wheel (12).

6. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 1, characterized in that: Two parallel positioning rollers (16) are rotatably connected between the two fixed plates (8), and two parallel elastic rollers (17) are rotatably connected inside the fixed frame (7), and the gap between the two positioning rollers (16) and the contact surface of the two elastic rollers (17) are aligned with each other.

7. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 6, characterized in that: The bottom of the fixed frame (7) is fixedly connected to a rotary motion detector (18), and the input end of the rotary motion detector (18) is fixedly connected to a rotating wheel (19). The bottom of the fixed frame (7) is fixedly connected to a yarn inlet hole (20).

8. The yarn feeding mechanism for preventing yarn slack and the circular knitting machine according to claim 7, characterized in that: The circular knitting machine including a yarn feeding mechanism is also disclosed, including a base (1) placed on the ground, a first bracket (2) fixedly connected to the top of the base (1), a ring of equally spaced yarn feeding components (3) fixedly connected to the bottom outer side of the first bracket (2), a second bracket (4) installed on the top of the first bracket (2), a fixed ring (5) fixedly connected to the bottom of the second bracket (4) by a connecting rod, and equally spaced yarn feeding components (6) fixedly connected to the bottom of the fixed ring (5), and each fixed ring (5) corresponds to each yarn feeding component (3).

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