Yarn conveying device

Abstract

The utility model discloses a yarn conveying device which comprises a transmission shaft, a first transmission wheel, a switcher, a second transmission wheel, a yarn pressing wheel and a yarn winding barrel, the first transmission wheel, the switcher, the second transmission wheel, the yarn pressing wheel and the yarn winding barrel are arranged on the periphery of the transmission shaft in a sleeved mode and sequentially arranged from the top to the bottom of the transmission shaft, and the yarn conveying device further comprises a linkage mechanism and a clutch mechanism. The clutch mechanism comprises a first clutch disc and a second clutch disc, the linkage rod is movably sleeved with the transmission shaft, the spring is arranged at the first end of the linkage rod in a sleeved mode and located in the transmission shaft, the second end of the linkage rod is connected with the connector, the connector is arranged on the periphery of the transmission shaft in a sleeved mode and located at the bottom of the yarn winding barrel, and the connector is matched with the yarn winding barrel. The first clutch disc and the second clutch disc are arranged on the periphery of the transmission shaft in a sleeving mode, the first clutch disc is located above the second clutch disc, and the second clutch disc is fixedly connected with the yarn winding barrel. The yarn conveying device has the advantages of being high in applicability, low in cost, compact in structure, small in size, capable of saving energy, high in functionality, flexible in mode switching and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to knitting mechanical equipment technical field, especially relates to a yarn feeder. BACKGROUND

[0002] Yarn feeder is an important component on circular weft knitting machine, and the yarn feeder mainly includes a shell, a main shaft and a thread wheel installed on the shell, a presser ring and a tension disc are sleeved on the thread wheel, the main shaft is located at the center of the thread wheel, and the main shaft drives the thread wheel to rotate to store yarn. Yarn storage is yarn feeding and storage on the thread wheel, and yarn feeding is yarn output from the thread wheel through the tension disc. In the production of high-quality weft knitted fabric, in order to control the size of the knitted loop and stabilize the yarn tension during knitting, a yarn feeding device for ensuring the quality of yarn feeding is required. At present, there are mainly two types of yarn feeding devices available: one is regular yarn feeding, also known as positive yarn feeder or fixed-length yarn feeding device. It does not need to use a main motor, but uses a strip provided on the knitting machine as a power source, which has the advantage of energy saving. However, it can only feed yarn quantitatively and cannot be used for jacquard technology. The other is an electronic yarn feeder for irregular yarn feeding, also known as a non-fixed-length yarn feeding device. A motor is provided in the yarn feeder, and a yarn detection system is used to determine whether to start the motor to drive the yarn storage wheel to perform a yarn replenishment action. Although it can meet the demand of irregular yarn feeding and be suitable for jacquard technology, an independent motor needs to be provided in each yarn feeder, which not only increases the volume but also increases the cost and energy consumption.

[0003] In the prior art, in order to make the production machine have the functions of regular yarn feeding and irregular yarn feeding, two sets of yarn feeding systems are generally provided. All yarn feeders of one set of yarn feeding system adopt regular yarn feeders, and all yarn feeders of the other set of yarn feeding system adopt irregular yarn feeders. Since all feeders of each set of yarn feeding system are distributed in a circular array, the overall volume of the existing feeding system is limited by the electronic yarn feeder, which has poor applicability and needs to be improved. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a yarn feeder which can at least solve one of the above problems.

[0005] According to one aspect of the utility model, a kind of yarn feeder is provided, including transmission shaft and the first transmission wheel, switch, second transmission wheel, presser bar and winding drum that are sequentially arranged along the top to bottom of transmission shaft and are sleeved on the outer periphery of transmission shaft, further including linkage mechanism and clutch mechanism, linkage mechanism includes linkage lever, spring and connecting head, clutch mechanism includes first clutch piece and second clutch piece, linkage lever is movably sleeved in the transmission shaft, spring is sleeved in the first end of linkage lever and located in transmission shaft, the second end of linkage lever is connected with connecting head, connecting head is sleeved on the outer periphery of transmission shaft and located at the bottom of winding drum, connecting head cooperates with winding drum, first clutch piece and second clutch piece are all sleeved on the outer periphery of transmission shaft and first clutch piece is located above second clutch piece, second clutch piece is fixedly connected with winding drum;

[0006] When non-length yarn feeding work is carried out, the winding drum can be relative to the transmission shaft, under the joint action of winding drum and linkage mechanism, second clutch piece can be relative to first clutch piece clutch.

[0007] In some embodiments, the winding drum is provided with a first limiting groove, and the clutch mechanism is arranged in the first limiting groove. Thus, the space can be effectively utilized to install the clutch mechanism, without increasing the overall volume.

[0008] In some embodiments, the linkage mechanism further includes a first sleeve and a second sleeve, the linkage lever is sleeved in the transmission shaft through the first sleeve, the second end of the linkage lever is connected with the connecting head through the second sleeve, the top end of the linkage lever forms a limiting head, and the two ends of the spring are respectively abutted with the limiting head and the first sleeve.

[0009] In some embodiments, the yarn feeder further includes a yarn amount adjusting mechanism, and the connecting head and the winding drum jointly form the yarn amount adjusting mechanism.

[0010] The connecting head includes a knob body and a connecting column arranged on the knob body, the knob body is provided with a containing groove, the connecting column is installed in the containing groove perpendicular to the groove bottom of the containing groove, and the inside of the connecting column is provided with a second limiting groove for limiting cooperation with the second sleeve.

[0011] The bottom of the winding drum is formed with a protruding portion, and the upper end of the knob body is threadedly matched with the protruding portion.

[0012] By twisting the knob body, the linkage lever can be moved along the length direction of the transmission shaft.

[0013] In some embodiments, the yarn feeder further includes a mode switching mechanism, the bottom end of the transmission shaft is sleeved with a follow-up gear, the follow-up gear rotates synchronously with the transmission shaft, and the follow-up gear and the connecting head jointly form the mode switching mechanism.

[0014] The bottom of the follow-up gear is provided with a limiting block, a third limiting groove is formed in the knob body and matched with the limiting block, and the connecting head can be moved upward to be combined with the yarn winding drum and make the limiting block inserted into the third limiting groove under the action of external force.

[0015] Therefore, when the fixed-length yarn feeding work is needed, the connecting head is pushed upward to make the limiting block of the follow-up gear inserted into the third limiting groove, at this time, the yarn winding drum, the follow-up gear and the connecting head can only rotate synchronously with the transmission shaft. The mode switching mechanism can quickly switch the working mode, which is convenient and fast.

[0016] In some embodiments, the outer wall of the protruding part is formed with a first tooth structure, the outer wall of the follow-up gear is formed with a second tooth structure, and the side groove wall of the accommodating groove is provided with a third tooth structure matched with the first tooth structure and a fourth tooth structure matched with the second tooth structure. Therefore, the mode switching can be quickly realized.

[0017] In some embodiments, the yarn feeder further comprises a first mounting frame and a dust cover, the first mounting frame is mounted on the loom, the transmission shaft is rotatably mounted on the first mounting frame and penetrates through the first mounting frame, the dust cover is mounted on the first mounting frame, the presser wheel is mounted on the dust cover, the first transmission wheel, the second transmission wheel and the switcher are located above the first mounting frame, and the presser wheel and the yarn winding drum are located below the first mounting frame.

[0018] In some embodiments, the yarn feeder further comprises a limiting mechanism, the limiting mechanism is matched with the first clutch piece to limit the movement of the first clutch piece along the length direction of the transmission shaft. Therefore, the first clutch piece can be fixed relative to the second clutch piece in the length direction of the transmission shaft, and the clutch function can be easily realized.

[0019] In some embodiments, when the non-fixed-length yarn feeding work is performed, the yarn is introduced, wound on the yarn winding drum for several turns and then introduced out to the loom. Under normal conditions, the first clutch piece and the second clutch piece are attached together and rotate synchronously with the transmission shaft together with the yarn winding drum, and the yarn winding drum winds yarn when rotating. When the yarn wound on the yarn winding drum increases to a certain amount, the yarn winding drum moves downward along the length direction of the transmission shaft, drives the second clutch piece to separate from the first clutch piece, and the yarn winding drum stops rotating. When the yarn wound on the yarn winding drum decreases to a certain amount, the spring drives the linkage rod to reset, the reset of the linkage rod drives the yarn winding drum and the second clutch piece to reset, and the second clutch piece and the first clutch piece are attached together again and rotate synchronously with the transmission shaft together with the yarn winding drum, to realize the cycle.

[0020] In some embodiments, during fixed-length yarn feeding, the switch is combined with the first drive wheel or the second drive wheel, and the rotation speed of the first drive wheel or the second drive wheel is adjusted so that the yarn introduction speed and the yarn extraction speed are the same. In this working mode, the yarn is introduced and wound around the yarn bobbin several times before being extracted to the loom. The first drive wheel or the second drive wheel drives the drive shaft to rotate, and the yarn bobbin rotates synchronously with the drive shaft. At this time, the introduction speed and the extraction speed are the same, the amount of yarn on the yarn bobbin remains constant, the yarn bobbin does not produce axial displacement, and the first clutch plate and the second clutch plate always remain in contact.

[0021] The beneficial effects of this utility model are:

[0022] 1. The yarn feeder of this utility model can achieve both fixed-length yarn feeding and non-fixed-length yarn feeding, making it highly applicable;

[0023] 2. The power source of this yarn feeder is the loom drive power. It uses the loom transmission belt for centralized transmission. The loom generally works 24 hours a day without stopping. The yarn feeder can be driven by the inertia of the loom. No additional drive is required, and no electricity is needed, which saves energy.

[0024] 3. Both fixed-length and non-fixed-length yarn feeding are completed in the same yarn feeder. The two modes can be switched by simply adjusting the speed of the transmission belt and the operating mode switching mechanism, making the switching method flexible.

[0025] 4. The connector integrates three functions: connection, mode switching, and yarn quantity adjustment, which can significantly reduce the overall size, making it compact, highly functional, and easy to operate.

[0026] 5. The machine uses a mechanical linkage mechanism to complete the non-fixed length yarn feeding operation, eliminating the need for motors and other driving components. This reduces costs and significantly decreases the overall size and space required, allowing for the assembly of larger looms.

[0027] In summary, the yarn feeder of this utility model has many advantages such as strong applicability, low cost, compact structure, small size, energy saving, strong functionality, and flexible mode switching. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0029] Figure 2 This is a three-dimensional structural diagram of the present invention after omitting the yarn introduction mechanism and the yarn exit mechanism as a whole.

[0030] Figure 3 for Figure 2 The diagram shows a top view of the yarn feeder.

[0031] Figure 4 forFigure 3 A schematic diagram of the cross-sectional structure of the yarn feeder along the GG direction;

[0032] Figure 5 for Figure 3 The schematic diagram of the cross-sectional structure of the yarn feeder along the HH direction is shown.

[0033] Figure 6 This is a three-dimensional structural diagram of the present invention with some parts omitted.

[0034] Figure 7 for Figure 6 One of the schematic diagrams of the exploded structure;

[0035] Figure 8 for Figure 6 The second schematic diagram of the explosion structure.

[0036] Figures 1-8 Figure labels in the diagram:

[0037] 1-Drive shaft; 2-First drive wheel; 3-Second drive wheel; 4-Switcher; 5-Pressure roller; 6-Winding bobbin; 7-Linkage mechanism; 8-Clutch mechanism; 9-Yarn introduction mechanism; 10-Yarn exit mechanism; 20-First mounting bracket; 30-Third assembly; 40-Fourth assembly; 50-Fifth assembly; 60-Dust cover; 70-Follower gear; 80-Limiting mechanism; 90-Tension ring; 100-Yarn breakage detection mechanism; 110-Yarn;

[0038] 61-First limiting groove; 62-Protrusion; 71-Linkage rod; 72-Spring; 73-Connector; 74-First assembly; 75-Second assembly; 81-First clutch plate; 82-Second clutch plate; 91-Second mounting bracket; 92-First yarn guide hole; 93-Yarn tensioner; 94-Yarn selector; 95-Second yarn guide hole; 96-Third yarn guide hole; 101-Third mounting bracket; 102-Fifth yarn guide hole; 103-Sixth yarn guide hole; 701-Limiting block; 702-Second toothed structure; 703-Second inclined surface; 801-Sixth assembly; 802-Washer; 803-Snap ring;

[0039] 621-First toothed structure; 622-First inclined surface; 711-Limiting head; 731-Knob body; 732-Connecting post; 941-Fourth yarn guide hole;

[0040] 731a - Receiving groove; 731b - Third limiting groove; 731c - Third toothed structure; 731d - Fourth toothed structure; 732a - Second limiting groove. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings.

[0042] Figures 1-8 The diagram schematically shows a yarn feeder according to one embodiment of the present invention.

[0043] like Figures 1-8 As shown, the yarn feeder includes a drive shaft 1 and a first drive wheel 2, a switcher 4, a second drive wheel 3, a yarn pressing wheel 5, and a yarn winding cylinder 6, which are mounted on the outer periphery of the drive shaft 1 and arranged sequentially from top to bottom along the drive shaft 1.

[0044] The yarn feeder in this embodiment also includes a linkage mechanism 7 and a clutch mechanism 8. The linkage mechanism 7 includes a linkage rod 71, a spring 72, and a connector 73. The clutch mechanism 8 includes a first clutch plate 81 and a second clutch plate 82. The linkage rod 71 is movably fitted inside the transmission shaft 1. The spring 72 is fitted inside the first end of the linkage rod 71 and is located inside the transmission shaft 1. The second end of the linkage rod 71 is connected to the connector 73. The connector 73 is fitted around the outer periphery of the transmission shaft 1 and is located at the bottom of the yarn winding cylinder 6. The connector 73 cooperates with the yarn winding cylinder 6. The first clutch plate 81 and the second clutch plate 82 are both fitted around the outer periphery of the transmission shaft 1, with the first clutch plate 81 located above the second clutch plate 82. The second clutch plate 82 is fixedly connected to the yarn winding cylinder 6.

[0045] When the yarn feeder of this utility model performs non-fixed length yarn feeding, the yarn winding cylinder 6 can be relative to the drive shaft 1. Under the joint action of the yarn winding cylinder 6 and the linkage mechanism 7, the second clutch plate 82 can be disengaged relative to the first clutch plate 81.

[0046] When the yarn feeder of this utility model is operating in a non-fixed length yarn feeding mode, the yarn 110 is introduced and wound around the yarn bobbin 6 several times before being led out to the loom. Under normal conditions, the first clutch plate 81 and the second clutch plate 82 are attached together and rotate synchronously with the yarn bobbin 6 along with the drive shaft 1. The yarn bobbin 6 winds yarn while rotating. When the amount of yarn 110 wound on the yarn bobbin 6 increases to a certain amount, the yarn bobbin 6 will move downward relative to the drive shaft 1 along the length direction of the drive shaft 1, causing the second clutch plate 82 to separate from the first clutch plate 81, and the yarn bobbin 6 stops rotating. When the amount of yarn 110 wound on the yarn bobbin 6 decreases to a certain amount, the spring 72 will drive the linkage rod 71 to reset. The reset of the linkage rod 71 will drive the yarn bobbin 6 and the second clutch plate 82 to reset. The second clutch plate 82 and the first clutch plate 81 will reattach together and rotate synchronously with the yarn bobbin 6 along with the drive shaft 1, and this cycle continues.

[0047] When the yarn feeder of this utility model is in fixed-length yarn feeding operation, the switch 4 is combined with the first drive wheel 2 or the second drive wheel 3, and the rotation speed of the first drive wheel 2 or the second drive wheel 3 is adjusted so that the yarn 110 introduction speed and the yarn 110 extraction speed are the same. In this mode, the yarn 110 is introduced and wound around the yarn bobbin 6 several times before being extracted to the loom. The first drive wheel 2 or the second drive wheel 3 drives the drive shaft 1 to rotate, and the yarn bobbin 6 rotates synchronously with the drive shaft 1. At this time, the introduction speed and the extraction speed are the same, the amount of yarn on the yarn bobbin 6 remains constant, the yarn bobbin 6 does not produce axial displacement, and the first clutch plate 81 and the second clutch plate 82 always remain in contact.

[0048] Preferably, the yarn bobbin 6 has a first limiting groove 61, and the clutch mechanism 8 is disposed within the first limiting groove 61. This effectively utilizes space to install the clutch mechanism 8 without increasing the overall volume.

[0049] Preferably, the linkage mechanism 7 further includes a first kit 74 and a second kit 75. The linkage rod 71 is fitted into the transmission shaft 1 through the first kit 74. The second end of the linkage rod 71 is connected to the connector 73 through the second kit 75. The top end of the linkage rod 71 forms a limiting head 711. The two ends of the spring 72 abut against the limiting head 711 and the first kit 74, respectively.

[0050] The first kit 74 is an M6 reducing threaded sleeve, and the second kit 75 can be a nut pre-embedded in the connector 73.

[0051] Preferably, the yarn feeder also includes a yarn quantity adjustment mechanism, wherein the connector 73 and the yarn winding bobbin 6 are combined to form the yarn quantity adjustment mechanism;

[0052] The connector 73 includes a knob body 731 and a connecting post 732 disposed on the knob body 731. The knob body 731 has a receiving groove 731a. The connecting post 732 is installed in the receiving groove 731a perpendicular to the bottom of the groove. The connecting post 732 has a second limiting groove 732a inside that cooperates with the second kit 75.

[0053] A protrusion 62 is formed at the bottom of the yarn winding tube 6, and the upper end of the knob body 731 is threadedly engaged with the protrusion 62.

[0054] By turning the knob body 731, the linkage rod 71 can be moved along the length direction of the transmission shaft 1.

[0055] Therefore, by turning the knob body 731, the distance between the limit head 711 and the spring 72 can be adjusted, thereby controlling the amount of yarn on the yarn bobbin 6. For example, turning the knob body 731 clockwise will make the amount of yarn required for the yarn bobbin 6 to move down more, and vice versa.

[0056] Preferably, the yarn feeder also includes a mode switching mechanism, with a follower gear 70 mounted on the bottom end of the drive shaft 1. The follower gear 70 rotates synchronously with the drive shaft 1, and the follower gear 70 and the connector 73 together form the mode switching mechanism.

[0057] The bottom of the follower gear 70 is provided with a limit block 701, and the knob body 731 is provided with a third limiting groove 731b that cooperates with the limit block 701. The connector 73 can move upward under the action of external force to engage with the yarn winding cylinder 6 and allow the limit block 701 to be inserted into the third limiting groove 731b.

[0058] Therefore, when fixed-length yarn feeding is required, the connector 73 can be pushed upwards, causing the limiting block 701 of the follower gear 70 to insert into the third limiting groove 731b. At this time, the yarn bobbin 6, the follower gear 70, and the connector 73 can only rotate synchronously with the drive shaft 1. The working mode can be quickly switched through the mode switching mechanism, making operation convenient and fast.

[0059] The outer wall of the protrusion 62 has a first toothed structure 621, the outer wall of the follower gear 70 has a second toothed structure 702, and the side wall of the receiving groove 731a has a third toothed structure 731c that mates with the first toothed structure 621 and a fourth toothed structure 731d that mates with the second toothed structure 702. This allows for quick and easy mode switching.

[0060] Preferably, the yarn feeder also includes a first mounting frame 20 and a dust cover 60. The first mounting frame 20 is mounted on the loom, and the drive shaft 1 is rotatably mounted on and passes through the first mounting frame 20 via bearings. The dust cover 60 is fixedly connected to the first mounting frame 20 by screws or other fasteners. The pressure roller 5 is obliquely fitted onto the bottom of the dust cover 60 via bearings and is covered by the dust cover 60. The dust cover 60 provides dust protection and allows for the oblique mounting of the pressure roller 5. The first drive wheel 2, the second drive wheel 3, and the switch 4 are located above the first mounting frame 20, while the dust cover 60, the pressure roller 5, and the yarn winding cylinder 6 are located below the first mounting frame 20.

[0061] Preferably, the yarn feeder also includes a limiting mechanism 80, which engages with the first clutch plate 81 to limit its movement along the length of the drive shaft 1. This allows the first clutch plate 81 to be fixed relative to the second clutch plate 82 along the length of the drive shaft 1, facilitating the engagement / disengagement function.

[0062] Specifically, the limiting mechanism 80 includes a sixth component 801, a gasket 802, and a retaining ring 803. The sixth component 801 is fitted around the outer periphery of the drive shaft 1, with its upper end abutting against the bearing fitted inside the first mounting bracket 20 and its lower end abutting against the upper surface of the first clutch plate 81. The gasket 802 is fitted around the outer periphery of the drive shaft 1 and fits against the lower surface of the first clutch plate 81. The retaining ring 803 is fixedly fitted around the outer periphery of the drive shaft 1 and its upper surface abuts against the gasket 802.

[0063] Preferably, the yarn feeder in this embodiment also includes a third kit 30, a fourth kit 40, a fifth kit 50, a tension ring 90, and a yarn breakage detection mechanism 100.

[0064] The third component 30 is preferably a hexagonal stud, which is fixedly fitted onto the outer periphery of the drive shaft 1. The switch 4 is slidably fitted onto the outer periphery of the third component 30. The fourth component 40 is preferably a cylindrical sleeve, the upper end of which abuts against the lower end face of the second drive wheel 3, and the lower end of which abuts against the bearing fitted inside the first mounting bracket 20. The fifth component 50 is preferably a cylindrical sleeve, which is fitted onto the outer periphery of the drive shaft 1 and located inside the first mounting bracket 20. There is a pair of bearings fitted inside the first mounting bracket 20, and the pair of bearings are limited by the fifth component 50.

[0065] The fourth component 40 can be an integral part of the winding bobbin 6 or a separate component connected by welding. The second component 75 can move with the winding bobbin 6, and its top is limited by a limiting baffle fitted around the outer periphery of the drive shaft 1.

[0066] The first transmission wheel 2 and the second transmission wheel 3 are both provided with limiting slots on their end faces near the switcher 4, which are matched with the limiting slots of the switcher 4. The switcher 4 can be engaged with the corresponding transmission wheel by engaging the limiting slot of the transmission wheel.

[0067] The yarn feeder in this embodiment also includes an introduction mechanism 9, which is used to introduce the yarn 110 into the yarn winding cylinder 6.

[0068] The yarn introduction mechanism 9 includes a second mounting frame 91 mounted on the first mounting frame 20, and a first yarn guide hole 92, a yarn tensioner 93, a yarn selector 94, a second yarn guide hole 95, and a third yarn guide hole 96 mounted on the second mounting frame 91. The yarn selector 94 is provided with a plurality of fourth yarn guide holes 941. The yarn 110 is introduced into the yarn winding bobbin 6 by passing through the first yarn guide hole 92, the yarn tensioner 93, the fourth yarn guide holes 941 of the yarn selector 94, the second yarn guide hole 95, and the third yarn guide hole 96 in sequence.

[0069] Tension coil 90 is fitted onto the lower end of yarn bobbin 6 and works in conjunction with yarn 110. Yarn 110 on yarn bobbin 6 can be drawn out through tension coil 90. Tension coil 90 serves to adjust the tension of yarn 110.

[0070] The yarn breakage detection mechanism 100 is existing technology, specifically consisting of a front detection frame, a rear detection frame, and corresponding sensors that are movably installed on the first mounting frame 20, which will not be described in detail here.

[0071] The yarn feeder in this embodiment also includes a lead-out mechanism 10, which is used to lead the yarn 110 from the yarn winding bobbin 6 to the loom.

[0072] The yarn feeding mechanism 10 includes a third mounting frame 101 mounted on the first mounting frame 20, and a fifth yarn guide hole 102 and a sixth yarn guide hole 103 mounted on the third mounting frame 101. During non-fixed length yarn feeding, the yarn 110 is fed to the loom through the fifth yarn guide hole 102. During fixed length yarn feeding, the yarn 110 is fed to the loom through the sixth yarn guide hole 103.

[0073] The yarn feeder in this embodiment also includes a dust cover 60, which is fitted around the outer periphery of the drive shaft 1 and located at the top of the yarn winding cylinder 6. The pressure roller 5 is obliquely fitted at the bottom of the dust cover 60 via a bearing and is covered by the dust cover 60. The dust cover 60 can provide dust protection and also allows for the oblique installation of the pressure roller 5.

[0074] The working principle of the yarn feeder of this utility model is as follows:

[0075] During non-fixed-length yarn feeding, the switch 4 is engaged with either the first transmission wheel 2 or the second transmission wheel 3, ensuring that the yarn 110 is introduced at a speed (assuming a setting of 100 r / min) higher than the yarn withdrawn at a speed (assuming a setting of 80 r / min). Simultaneously, it is necessary to ensure that the limiting block 701 of the follower gear 70 is not inserted into the third limiting groove 731b of the connector 73. The yarn 110 is introduced through the introducing mechanism 9 and wound several times on the yarn bobbin 6 before being withdrawn to the loom through the withdrawing mechanism 10. Due to the speed difference, the amount of yarn on the yarn bobbin 6 gradually increases, causing the friction between the yarn 110 and the yarn bobbin 6 to gradually increase. When the amount of yarn 110 wound on the yarn bobbin 6 reaches a certain level, the friction between the yarn 110 and the yarn bobbin 6 exceeds the restoring force of the spring 72. Under the combined action of this friction and the pressure roller 5 squeezing the yarn 110, the yarn bobbin 6... As the length of the drive shaft 1 moves downward relative to the drive shaft 1, the yarn bobbin 6 moves downward, causing the connector 73 and the second clutch plate 82 to move downward together. The downward movement of the connector 73 causes the linkage shaft to move downward, which in turn causes the limit head 711 to compress the spring 72. The second clutch plate 82 moves downward away from the first clutch plate 81, causing the yarn bobbin 6 to lose power and stop rotating. At this time, the lead-in speed of the yarn 110 is less than the lead-out speed. The loom continuously uses the yarn 110, which gradually reduces the amount of yarn 110 wound on the yarn bobbin 6. When the amount is reduced to a certain level, the friction between the yarn 110 and the yarn bobbin 6 is less than the reset force of the spring 72. The linkage shaft resets under the action of the spring 72, causing the connector 73 and the yarn bobbin 6 to reset and move upward together. The yarn bobbin 6 causes the second clutch plate 82 to re-engage with the first clutch plate 81. After resetting, the yarn bobbin 6 rotates synchronously with the drive shaft 1 to wind yarn, and this cycle continues.

[0076] When the yarn is fed in a fixed length, the switcher 4 can be combined with the first drive wheel 2 or the second drive wheel 3. Simply insert the limiting block 701 of the follower gear 70 into the third limiting groove 731b of the connector 73 and set the lead-in speed and lead-out speed to be the same. In this working mode, the yarn 110 is introduced through the lead-in mechanism 9 and wound around the yarn bobbin 6 several times before being led out to the loom through the lead-out mechanism 10. The first drive wheel 2 or the second drive wheel 3 drives the drive shaft 1 to rotate. The yarn bobbin 6, the connector 73 and the drive shaft 1 rotate synchronously. At this time, the lead-in speed and the lead-out speed are the same. The amount of yarn on the yarn bobbin 6 remains constant. The yarn bobbin 6 does not produce axial displacement. The linkage shaft does not produce axial displacement. The first clutch plate 81 and the second clutch plate 82 always remain in contact.

[0077] The yarn feeder of this invention has at least the following advantages over existing yarn feeders:

[0078] 1. The yarn feeder of this utility model can achieve both fixed-length yarn feeding and non-fixed-length yarn feeding, making it highly applicable;

[0079] 2. The power source of this yarn feeder is the loom drive power. It uses the loom transmission belt for centralized transmission. The loom generally works 24 hours a day without stopping. The yarn feeder can be driven by the inertia of the loom. No additional drive is required, and no electricity is needed, which saves energy.

[0080] 3. Both fixed-length and non-fixed-length yarn feeding are completed in the same yarn feeder. The two modes can be switched by simply adjusting the speed of the transmission belt and the operating mode switching mechanism, making the switching method flexible.

[0081] 4. The connector 73 integrates three functions: connection, mode switching, and yarn quantity adjustment. It can significantly reduce the overall size, has a compact structure, strong functionality, and is easy to operate.

[0082] 5. The mechanical linkage mechanism 7 is used to complete the non-fixed length yarn feeding work. There is no need to use motors or other driving components. The cost is low and the overall volume can be greatly reduced. It occupies little space and can be assembled into a larger loom.

[0083] In summary, the yarn feeder of this utility model has many advantages such as strong applicability, low cost, compact structure, small size, energy saving, strong functionality, and flexible mode switching.

[0084] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A yarn feeding device comprising a driving shaft (1) and a first driving wheel (2), a switcher (4), a second driving wheel (3), a presser wheel (5) and a bobbin (6) which are successively arranged from the top to the bottom of the driving shaft (1) and are fitted to the outer periphery of the driving shaft (1), characterized in that, The linkage mechanism (7) comprises a linkage rod (71), a spring (72) and a connecting head (73), and the clutch mechanism (8) comprises a first clutch piece (81) and a second clutch piece (82), the linkage rod (71) is movably sleeved in the transmission shaft (1), the spring (72) is sleeved at the first end of the linkage rod (71) and located in the transmission shaft (1), the second end of the linkage rod (71) is connected with the connecting head (73), the connecting head (73) is sleeved on the outer periphery of the transmission shaft (1) and located at the bottom of the winding drum (6), the connecting head (73) cooperates with the winding drum (6), the first clutch piece (81) and the second clutch piece (82) are both sleeved on the outer periphery of the transmission shaft (1) and the first clutch piece (81) is located above the second clutch piece (82), the second clutch piece (82) is fixedly connected with the winding drum (6); When the non-fixed-length yarn feeding work is performed, the winding drum (6) can relatively move with respect to the transmission shaft (1), and under the joint action of the winding drum (6) and the linkage mechanism (7), the second clutch piece (82) can be clutched with respect to the first clutch piece (81).

2. The yarn feeder according to claim 1, characterized in that The winding drum (6) is provided with a first limiting groove (61), and the clutch mechanism (8) is arranged in the first limiting groove (61).

3. The yarn feeder of claim 1, wherein The linkage mechanism (7) further comprises a first sleeve (74) and a second sleeve (75), the linkage rod (71) is sleeved in the transmission shaft (1) through the first sleeve (74), the second end of the linkage rod (71) is connected with the connecting head (73) through the second sleeve (75), the top end of the linkage rod (71) forms a limiting head (711), and the two ends of the spring (72) are respectively abutted against the limiting head (711) and the first sleeve (74).

4. The yarn feeder according to claim 3, characterized in that The connecting head (73) and the winding drum (6) jointly form a yarn amount adjusting mechanism. The connecting head (73) comprises a knob body (731) and a connecting column (732) arranged on the knob body (731), the knob body (731) is provided with an accommodating groove (731a), the connecting column (732) is installed in the accommodating groove (731a) and perpendicular to the groove bottom of the accommodating groove (731a), and the inside of the connecting column (732) is provided with a second limiting groove (732a) for limiting cooperation with the second sleeve (75). The bottom of the winding drum (6) is formed with a protruding portion (62), and the upper end of the knob body (731) is threadedly cooperated with the protruding portion (62). The linkage rod (71) can be driven to move along the length direction of the transmission shaft (1) by twisting the knob body (731).

5. The yarn feeder according to claim 4, characterized in that The mode switching mechanism is formed by a follow-up gear (70) sleeved at the bottom end of the transmission shaft (1) and a connecting head (73). A limiting block (701) is arranged at the bottom of the follow-up gear (70), a third limiting groove (731b) is formed in the knob body (731) to limit the limiting block (701), and the connecting head (73) can be moved upward to be combined with the yarn winding drum (6) under the action of an external force and make the limiting block (701) inserted into the third limiting groove (731b).

6. The yarn feeder according to claim 5, characterized in that A first tooth structure (621) is formed on the outer wall of the convex part (62), a second tooth structure (702) is formed on the outer wall of the follow-up gear (70), a third tooth structure (731c) matched with the first tooth structure (621) and a fourth tooth structure (731d) matched with the second tooth structure (702) are arranged on the side groove wall of the accommodating groove (731a).

7. A yarn feeder according to any one of claims 1-6, characterized in that The first mounting frame (20) is mounted on the loom, the transmission shaft (1) is rotatably mounted on and penetrates through the first mounting frame (20), the dust cover (60) is mounted on the first mounting frame (20), the presser wheel (5) is mounted on the dust cover (60), the first transmission wheel (2), the second transmission wheel (3) and the switch (4) are located above the first mounting frame (20), and the presser wheel (5) and the yarn winding drum (6) are located below the first mounting frame (20).

8. The yarn feeder according to claim 7, characterized in that The limiting mechanism (80) is limited to cooperate with the first clutch piece (81), and is used for limiting the movement of the first clutch piece (81) along the length direction of the transmission shaft (1).

9. A yarn feeder according to any one of claims 1-6, characterized in that In the non-length yarn feeding operation, the yarn (110) is introduced and wound on the bobbin (6) for several turns and then introduced to the loom. In the normal state, the first clutch plate (81) and the second clutch plate (82) are attached together and rotate synchronously with the driving shaft (1) along with the bobbin (6), and the bobbin (6) rotates to wind the yarn (110) when the yarn (110) wound on the bobbin (6) increases to a certain amount, the bobbin (6) moves downward along the length direction of the driving shaft (1) relative to the driving shaft (1), driving the second clutch plate (82) to separate from the first clutch plate (81), and the bobbin (6) stops rotating, when the yarn (110) wound on the bobbin (6) decreases to a certain amount, the spring (72) drives the linkage rod (71) to reset, the linkage rod (71) resets the bobbin (6) and the second clutch plate (82) to reset, the second clutch plate (82) and the first clutch plate (81) are attached together again and rotate synchronously with the driving shaft (1) along with the bobbin (6), and the cycle is repeated.

10. A yarn feeder according to any one of claims 1-6, characterized in that In the length yarn feeding operation, the switch (4) is combined with the first driving wheel (2) or the second driving wheel (3), and the speed of the first driving wheel (2) or the second driving wheel (3) is adjusted to make the yarn (110) introduction speed consistent with the yarn (110) introduction speed. In this working mode, the yarn (110) is introduced and wound on the bobbin (6) for several turns and then introduced to the loom, the first driving wheel (2) or the second driving wheel (3) drives the driving shaft (1) to rotate, and the bobbin (6) rotates synchronously with the driving shaft (1), at this time the introduction speed and the introduction speed are consistent, the amount of yarn on the bobbin (6) remains constant, the bobbin (6) does not produce axial displacement, and the first clutch plate (81) and the second clutch plate (82) always remain attached.

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