Cloth dragging wheel structure of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a cloth dragging wheel structure of a sewing machine, which comprises a mechanism shell, a cloth dragging wheel mechanism, a driving mechanism, a linkage mechanism and the like. The linkage mechanism utilizes a second one-way bearing to intelligently associate the lifting action of the cloth dragging wheel with the rotating direction of the driving motor, the operation process is simplified, the cost is reduced, the adjusting mechanism can accurately adjust the downward pressure of the cloth dragging wheel according to cloth characteristics, the application range of the sewing machine is widened, sewing defects are reduced, and the product percent of pass is improved. The cloth dragging wheel mechanism is further provided with a manual device, a tension adjusting mechanism and a damping mechanism which are used for manually lifting the cloth dragging wheel, adjusting tension of the synchronous belt and stabilizing rotation of the cloth dragging wheel respectively, operation safety, transmission stability and sewing accuracy are enhanced, the cloth dragging wheel mechanism effectively solves many problems existing in a traditional cloth dragging wheel mechanism, and the cloth dragging wheel mechanism has remarkable practical value.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, specifically a sewing machine drag wheel structure. Background Technology

[0002] The fabric feeding mechanism of a sewing machine is a key component, mainly used to assist in feeding the fabric, ensuring a smooth sewing process, facilitating the operator to change and adjust the fabric, and greatly improving the working efficiency and sewing quality of the sewing machine.

[0003] The existing sewing machine feed roller mechanism mainly consists of a feed roller, a drive motor, and a transmission component. The working principle is as follows: the drive motor starts to provide power, and the rotational motion of the motor is transmitted to the feed roller through the transmission component to make it rotate. The feed roller contacts the fabric and uses friction to drive the fabric to move, thereby realizing the fabric feeding operation.

[0004] The existing technology for sewing machine drag wheel mechanisms has the following drawbacks: Traditional sewing machine drag wheel lifting mechanisms typically rely on complex independent control components and additional power sources. These systems often require specialized motors, controllers, and complex mechanical transmission devices to achieve the drag wheel lifting action. This not only results in complex equipment structures and high costs, but also cumbersome operation procedures. Operators need to learn and master complex control methods, which seriously affects work efficiency and cannot meet actual production needs. Furthermore, most existing sewing machines lack a flexible drag wheel pressure adjustment mechanism, usually only having a simple fixed pressure setting, which is difficult to adapt to fabrics of different thicknesses and materials, affecting product quality and reducing product qualification rates. Therefore, to address the above problems, a new drag wheel structure for sewing machines is proposed. Utility Model Content

[0005] To address the shortcomings of existing sewing machine drag wheel mechanisms, a new drag wheel structure for sewing machines is proposed.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The sewing machine drag wheel structure of this utility model includes a mechanism housing fixedly assembled on one side of the machine head, a drag wheel mechanism for dragging cloth is assembled inside the mechanism housing, and a drive mechanism for driving the drag wheel mechanism to work is also assembled inside the mechanism housing. A linkage mechanism for lifting the drag wheel mechanism is also assembled inside the mechanism housing in conjunction with the drive mechanism.

[0007] Preferably, the mop roller mechanism includes an assembly block rotatably mounted inside the mechanism housing via a rotating component. A first rotating rod is rotatably mounted on the assembly block via a bearing. A first synchronous pulley is mounted on the first rotating rod. A second synchronous pulley, rotating synchronously with the first synchronous pulley, is mounted at one end of the first rotating rod. A second rotating rod is rotatably mounted on the assembly block via a bearing. A third synchronous pulley is mounted at one end of the second rotating rod. A mop roller is mounted at the other end of the second rotating rod via a first one-way bearing. A first synchronous belt is driven between the second and third synchronous pulleys. The drive mechanism includes a drive motor. A fourth synchronous pulley is mounted at the output end of the drive motor via a coupling. A second synchronous belt is driven between the fourth and first synchronous pulleys.

[0008] Preferably, the linkage mechanism includes a rocker arm rotatably mounted inside the mechanism housing via a rotating component, a connecting rod rotatably mounted at one end of the rocker arm, and the other end of the connecting rod rotatably connected to one side of the assembly block. It also includes a second one-way bearing mounted on the output end of the drive motor, an eccentric wheel mounted on the second one-way bearing, and a roller rotatably mounted on one side of the rocker arm, the roller abutting against the eccentric wheel.

[0009] Preferably, the outer casing of the mechanism is equipped with an adjustment mechanism for adjusting the downward pressure of the drag wheel mechanism on the fabric. The adjustment mechanism includes an adjustment bolt threadedly mounted on the outer casing of the mechanism, the adjustment bolt having a through hole at its center, and a guide rod mounted on the connecting rod. The guide rod extends into the through hole, and a first spring is fitted around the guide rod. The bottom end of the adjustment bolt abuts against the top end of the first spring.

[0010] Preferably, the housing of the mechanism is equipped with a manual device for manually lifting the mop wheel mechanism. The manual device includes a mounting block fixedly installed inside the housing of the mechanism. A handle is rotatably mounted on the mounting block via a rotating component. One side of the handle is a drive unit, and one side of the connecting rod is provided with a linkage bending part that cooperates with the drive unit.

[0011] Preferably, the housing of the mechanism is equipped with a tension adjustment mechanism for adjusting the tension of the first and second synchronous belts at the positions of the first and second synchronous belts. The tension adjustment mechanism includes a rotatably disposed adjustment block, an arc-shaped adjustment hole on the adjustment block, an adjustment screw for fixing the position of the adjustment block in the arc-shaped adjustment hole, and a pulley that cooperates with the first and second synchronous belts rotatably mounted on the adjustment block.

[0012] Preferably, the mop wheel mechanism further includes a damping mechanism for stabilizing the rotation of the mop wheel. The damping mechanism includes a fixed block fixedly disposed on one side of the assembly block. A damping block is slidably guided on the inner wall of the fixed block. A second spring is connected between the inner wall of the fixed block and the damping block. One end of the damping block is arc-shaped and cooperates with the mop wheel to abut against it.

[0013] The beneficial effects of this utility model are:

[0014] 1. By utilizing the unidirectional rotation characteristic of the second one-way bearing, the lifting action of the fabric roller and the rotation direction of the drive motor are intelligently linked. During normal sewing, the drive motor runs in the forward direction, the second one-way bearing is locked, the eccentric wheel is stationary, and the fabric roller stably pulls the fabric. When it is necessary to lift the fabric roller, it is only necessary to control the drive motor to rotate in the reverse direction, the second one-way bearing is unlocked, and the eccentric wheel is driven to rotate. The unique eccentric structure of the eccentric wheel allows it to convert the rotational motion into the up and down swing of the swing arm through cooperation with the roller on the swing arm. Then, through the connecting rod, the assembly block is driven to rotate, thereby lifting the fabric roller. This design eliminates the traditional complex additional control mechanism and power source, greatly simplifies the operation process of the sewing machine, reduces the manufacturing and maintenance costs of the equipment, and the linkage method responds quickly, completing the lifting action of the fabric roller instantly. This provides great convenience for operators when placing and adjusting the fabric, significantly improving the operational flexibility and work efficiency of the sewing machine, especially suitable for production scenarios where fabric is frequently changed or the sewing position is adjusted.

[0015] 2. The adjustment mechanism can precisely adjust the downward pressure of the drag roller on the fabric according to the characteristics of different fabrics. In the actual sewing process, the downward pressure requirements of fabrics of different thicknesses and materials vary greatly. For example, thin silk fabrics require less downward pressure to prevent wrinkles, while thick denim fabrics require greater downward pressure to ensure smooth conveying. The adjustment mechanism of this utility model allows operators to easily handle various fabrics, ensuring that the fabric can be conveyed smoothly in any sewing scenario. At the same time, it avoids damage to the fabric due to excessive pressure or poor conveying due to insufficient pressure, effectively expanding the application range of sewing machines, reducing sewing defects caused by improper downward pressure, and significantly improving the product qualification rate. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a three-dimensional structural view of the entire utility model;

[0018] Figure 2 This is a three-dimensional structural view of the interior of the outer shell of this utility model.

[0019] Figure 3 This is a three-dimensional enlarged view of the linkage mechanism in this utility model;

[0020] Figure 4 This is a three-dimensional enlarged view of the mop wheel mechanism in this utility model;

[0021] Figure 5 This is a three-dimensional enlarged view of the tension adjustment mechanism in this utility model;

[0022] Figure 6 This is an enlarged cross-sectional view of the adjustment mechanism in this utility model;

[0023] Figure 7 This is an enlarged cross-sectional view of the damping mechanism in this utility model;

[0024] Legend:

[0025] 1. Machine head; 2. Mechanism housing; 3. Drag wheel mechanism; 301. Assembly block; 302. First synchronous pulley; 303. Second synchronous pulley; 304. Second rotating rod; 305. Third synchronous pulley; 306. First one-way bearing; 307. Drag wheel; 308. First synchronous belt; 309. First rotating rod; 4. Drive mechanism; 401. Drive motor; 402. Fourth synchronous pulley; 403. Second synchronous belt; 5. Linkage mechanism; 501. Swing arm; 502. Connecting rod; 503. Second one-way shaft 504. Eccentric wheel; 505. Roller; 6. Adjustment mechanism; 601. Adjusting bolt; 602. Through hole; 603. Guide rod; 604. First spring; 7. Manual device; 701. Mounting block; 702. Handle; 703. Drive unit; 704. Linkage bending unit; 8. Tension adjustment mechanism; 801. Adjusting block; 802. Arc-shaped adjusting hole; 803. Adjusting screw; 804. Pulley; 9. Damping mechanism; 901. Fixing block; 902. Damping block; 903. Second spring. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Specific implementation examples are given below.

[0028] Please see Figures 1-7The present invention discloses a mop wheel structure for a sewing machine, comprising a mechanism housing 2 fixedly mounted on one side of the machine head 1. A mop wheel mechanism 3 for mopping is mounted inside the mechanism housing 2, and a drive mechanism 4 for driving the mop wheel mechanism 3. A linkage mechanism 5, which works in conjunction with the drive mechanism 4, for lifting the mop wheel mechanism 3 is also mounted inside the mechanism housing 2. The mop wheel mechanism 3 includes an assembly block 301 rotatably mounted inside the mechanism housing 2 via a rotating component. A first rotating rod 309 is rotatably mounted on the assembly block 301 via a bearing. A first synchronous wheel 302 is mounted on the first rotating rod 309, and one end of the first rotating rod 309 is equipped with a component that rotates synchronously with the first synchronous wheel 302. The second synchronous pulley 303 is mounted on the assembly block 301 via a bearing, and a second rotating rod 304 is rotatably mounted on the assembly block 301. A third synchronous pulley 305 is mounted on one end of the second rotating rod 304, and a mop wheel 307 is mounted on the other end of the second rotating rod 304 via a first one-way bearing 306. A first synchronous belt 308 is driven between the second synchronous pulley 303 and the third synchronous pulley 305. The drive mechanism 4 includes a drive motor 401, and a fourth synchronous pulley 402 is mounted on the output end of the drive motor 401 via a coupling. A second synchronous belt 403 is driven between the fourth synchronous pulley 402 and the first synchronous pulley 302. During operation, when the drive motor 401 is powered on and started, the output shaft of the drive motor 401 begins to... The rotation of the first synchronous pulley 302, which is tightly connected to the first synchronous pulley 302 via a coupling, causes the first rotating rod 309 to rotate around its axis. Since the first rotating rod 309 is connected to both the first and second synchronous pulleys 302 by a second synchronous belt 403, the second synchronous belt 403 transmits the rotation of the fourth synchronous pulley 402 to the first synchronous pulley 302, causing the first rotating rod 309 to rotate. Because the first rotating rod 309 is equipped with both the first and second synchronous pulleys 302 and 303, the second synchronous pulley 303 also rotates along with the first rotating rod 309. The second synchronous pulley 303 drives the third synchronous pulley 305 to rotate via the first synchronous belt 308. The third synchronous pulley 305 is mounted on the second rotating rod 304, thereby driving the second rotating rod 305. 4. The fabric roller 307 is mounted on the other end of the second rotating rod 304 via a first one-way bearing 306. The characteristics of the first one-way bearing 306 determine that the fabric roller 307 will only rotate when the second rotating rod 304 rotates in a specific direction. This ensures that the fabric roller 307 always feeds the fabric in the correct direction during operation, avoiding incorrect fabric feeding direction due to motor reversal or other abnormalities. The transmission structure of this utility model ensures that the fabric roller rotates at a stable speed, thereby achieving uniform and stable fabric feeding. The setting of the first one-way bearing enhances the reliability of the fabric roller's operation, effectively prevents abnormalities during fabric feeding, and ensures the stability and continuity of the sewing machine's operation.

[0029] Furthermore, the linkage mechanism 5 includes a rocker arm 501 rotatably mounted inside the mechanism housing 2 via a rotating component. One end of the rocker arm 501 is rotatably mounted with a connecting rod 502, and the other end of the connecting rod 502 is rotatably connected to one side of the assembly block 301. It also includes a second one-way bearing 503 mounted on the output end of the drive motor 401. An eccentric wheel 504 is mounted on the second one-way bearing 503. A roller 505 is rotatably mounted on one side of the rocker arm 501, and the roller 505 abuts against the eccentric wheel 504. During operation, under normal working conditions, when the drive motor 401 rotates, causing the mop roller 307 to move normally... When conveying the fabric, due to the unidirectional rotation characteristic of the second one-way bearing 503, the output of the drive motor 401 will not drive the second one-way bearing 503 and the eccentric wheel 504 to rotate. The mop roller 307 will continuously and stably perform the mop operation. However, when it is necessary to lift the mop roller 307, for example, when a worker needs to place or adjust the fabric, the drive motor 401 is controlled to rotate in the opposite direction. The output of the drive motor 401 begins to drive the second one-way bearing 503 to rotate. Because the second one-way bearing 503 is allowed to rotate in this direction, it will drive the eccentric wheel 504 to rotate as well. Due to the geometric center of the eccentric wheel 504... Since the eccentric wheel 504 does not coincide with the center of rotation, the contact point between its circumferential surface and the roller 505 changes continuously during the rotation of the eccentric wheel 504, causing the roller 505 to move up and down. The roller 505 is mounted on the rocker arm 501, so the rocker arm 501 swings up and down with the movement of the roller 505. The other end of the connecting rod 502 is rotatably connected to the rocker arm 501, and the connecting rod 502 is also connected to the assembly block 301. When the rocker arm 501 moves up and down, it will drive the assembly block 301 to rotate around its rotating component through the connecting rod 502, realizing the lifting action of the mop wheel mechanism 3. This linkage mechanism 5 cleverly utilizes the second one-way bearing 50. The feature of 3 allows the lifting operation of the mop roller 307 to be easily completed by simply controlling the rotation direction of the drive motor 401 without affecting the normal mop operation. This design greatly simplifies the operation process of the sewing machine, avoids the setting of additional control mechanisms and power sources, reduces the complexity and cost of the equipment, and achieves the lifting action of the mop roller 307 by rotating the drive motor 401 in the opposite direction. The operation is simple and responsive, and the mop roller can be quickly lifted when needed, which provides great convenience for operators when placing and adjusting fabric, and improves the operational flexibility and work efficiency of the sewing machine.

[0030] Furthermore, the housing 2 of the mechanism is equipped with an adjustment mechanism 6 for adjusting the downward pressure of the mop wheel mechanism 3 on the fabric. The adjustment mechanism 6 includes an adjustment bolt 601 threadedly mounted on the housing 2 of the mechanism, the adjustment bolt 601 having a through hole 602 at its center, and a guide rod 603 mounted on the connecting rod 502. The guide rod 603 extends into the through hole 602, and a first spring 604 is fitted around the guide rod 603. The bottom end of the adjustment bolt 601 abuts against the top end of the first spring 604. During operation, when it is necessary to adjust the downward pressure of the mop wheel mechanism 3 on the fabric, When applying force, the operator rotates the adjusting bolt 601. Since the adjusting bolt 601 is threadedly connected to the housing 2, when it rotates, it moves up and down along the thread direction. The bottom end of the adjusting bolt 601 abuts against the top end of the first spring 604. As the adjusting bolt 601 moves up and down, the pressure it exerts on the first spring 604 changes accordingly. The first spring 604 is elastic and deforms when subjected to pressure changes. This deformation is transmitted to the connecting rod 502 via the guide rod 603. Because the guide rod 603 is mounted on the connecting rod 502... The connecting rod 502 extends into the through hole 602 of the adjusting bolt 601, serving as a guide and force transmitter. Changes in the position of the connecting rod 502 affect the position of the assembly block 301 via the swing rod 501, thereby altering the downward pressure of the drag wheel 307 on the fabric. When the adjusting bolt 601 rotates downwards, the pressure on the first spring 604 increases, compressing the spring and increasing the downward pressure of the drag wheel 307 on the fabric via the connecting rod 502 and the swing rod 501. Conversely, when the adjusting bolt 601 rotates upwards, the pressure on the first spring 604 decreases, the spring extends, and the downward pressure of the drag wheel 307 on the fabric decreases. The small adjustment mechanism provides a flexible and convenient way to adjust the downward pressure of the sewing machine. In actual sewing, different thicknesses and materials of fabrics require different downward pressure from the feed roller. Through this adjustment mechanism, the operator can easily adjust the downward pressure of the feed roller according to the specific fabric conditions, ensuring that the fabric is fed smoothly in various sewing scenarios without affecting the sewing quality due to excessive or insufficient pressure. This improves the sewing machine's adaptability to different fabrics, broadens its application range, and effectively reduces sewing defects caused by improper downward pressure, thereby increasing the product qualification rate.

[0031] Furthermore, the housing 2 of the mechanism is equipped with a manual device 7 for manually lifting the mop wheel mechanism 3. The manual device 7 includes a mounting block 701 fixedly installed inside the housing 2. A handle 702 is rotatably mounted on the mounting block 701 via a rotating component. One side of the handle 702 is a drive part 703, and one side of the connecting rod 502 is provided with a linkage bending part 704 that cooperates with the drive part 703. During operation, when the operator needs to manually lift the mop wheel mechanism 3, he / she holds the handle 702 and rotates it around its rotating component. During the rotation, the drive part 703 of the handle 702 interacts with the linkage bending part 704 on the connecting rod 502. As the handle 702 rotates, the drive part 703 gradually pushes the linkage bending part 704, causing the connecting rod 502 to displace. The displacement of the connecting rod 502 will drive the mounting block 301 to rotate around its rotating component, thereby lifting the mop wheel mechanism 3. When handle 702 is released, under the influence of gravity, handle 702 and connecting rod 502, among other components, can return to their initial positions. The fabric roller mechanism 3 can also be lowered again as needed. The manual device provides additional flexibility and safety for sewing machine operation. In some special situations, such as emergency stop of sewing, quick adjustment of fabric position, or clearing of fabric blockages, the operator may not be able to lift the fabric roller in time using the normal drive mechanism and linkage mechanism. The manual device plays an important role in this situation. The operator can directly and quickly lift the fabric roller by turning the handle, avoiding the waste of time or fabric damage caused by waiting for the automatic mechanism to respond. This manual operation method increases the operator's control over the sewing machine, improves the humanization of operation, and enables the sewing machine to operate more stably and efficiently in various complex working scenarios.

[0032] Furthermore, tension adjustment mechanisms 8 are installed inside the housing 2 at the positions of the first synchronous belt 308 and the second synchronous belt 403 to adjust their tension. Each tension adjustment mechanism 8 includes a rotatably mounted adjustment block 801 with an arc-shaped adjustment hole 802. An adjustment screw 803 for fixing the position of the adjustment block 801 is installed in the arc-shaped adjustment hole 802. A pulley 804 cooperating with the first synchronous belt 308 and the second synchronous belt 403 is rotatably mounted on the adjustment block 801. During operation, when the tension of the synchronous belt needs to be adjusted, the adjustment screw 803 is first loosened, allowing the adjustment block 801 to rotate freely within a certain range. Since the pulley 804 is rotatably mounted on the adjustment block 801 and cooperates with the first synchronous belt 308 or the second synchronous belt 403, when the adjustment block 801... When the pulley 804 rotates around its center of rotation, it exerts a force on the timing belt, thereby changing the tension of the timing belt. The arc-shaped adjustment hole 802 on the adjustment block 801 allows the adjustment block 801 to rotate within a certain angle range. After the timing belt is adjusted to the appropriate tension by rotating the adjustment block 801, the adjustment screw 803 is tightened again so that it passes through the arc-shaped adjustment hole 802 and is fixed on the housing 2 of the mechanism, thereby locking the adjustment block 801 in the current position and keeping the tension of the timing belt stable. Through this tension adjustment mechanism, the operator can conveniently and quickly adjust the tension of the timing belt, ensuring that the timing belt always operates in the best working condition, improving the stability and accuracy of the transmission, ensuring the stable speed of the drag wheel, thereby improving the sewing quality, and also reducing the maintenance cost of the equipment and the frequency of replacing parts.

[0033] Furthermore, the mop wheel mechanism 3 also includes a damping mechanism 9 for stabilizing the rotation of the mop wheel 307. The damping mechanism 9 includes a fixing block 901 fixedly disposed on one side of the assembly block 301. A damping block 902 is slidably guided on the inner wall of the fixing block 901. A second spring 903 is connected between the inner wall of the fixing block 901 and the damping block 902. One end of the damping block 902 is arc-shaped and abuts against the mop wheel 307. During operation, when the sewing machine is working normally, the drive motor 401 drives the mop wheel 307 to rotate. At this time, under the elastic force of the second spring 903, the arc-shaped end of the damping block 902 is always tightly abutting against the outer wall of the mop wheel 307. When the drive motor 401 is running normally, the mop wheel 307 will overcome the damping force of the damping block 902. The added friction allows the roller 307 to rotate normally, enabling the mopping operation of the fabric. The friction also makes the rotation of the mopping roller 307 more stable. Even after the drive motor 401 stops, the mopping roller 307 still tends to continue rotating due to inertia. However, because the damping block 902 is constantly in contact with the outer wall of the mopping roller 307, friction exists between them. This friction creates resistance that hinders the rotation of the mopping roller 307. In this way, the damping mechanism 9 effectively suppresses the mopping roller 307 from continuing to rotate due to inertia, ensuring that the mopping roller 307 stops moving quickly when the drive motor 401 stops. This prevents the fabric from continuing to move due to the inertia of the mopping roller 307 after the sewing operation stops, thus ensuring the accuracy and stability of the sewing operation.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] 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.

Claims

1. A drag wheel structure for a sewing machine, characterized in that: Includes a mechanism housing (2) fixedly mounted on one side of the machine head (1), wherein a mop wheel mechanism (3) for mopping is installed inside the mechanism housing (2), and a drive mechanism (4) for driving the mop wheel mechanism (3) to work is installed inside the mechanism housing (2), and a linkage mechanism (5) for lifting the mop wheel mechanism (3) is also installed inside the mechanism housing (2) in conjunction with the drive mechanism (4). The linkage mechanism (5) includes a rocker arm (501) rotatably mounted in the housing (2) of the mechanism via a rotating component. One end of the rocker arm (501) is rotatably mounted with a connecting rod (502), and the other end of the connecting rod (502) is rotatably connected to one side of the assembly block (301). It also includes a second one-way bearing (503) mounted on the output end of the drive motor (401). An eccentric wheel (504) is mounted on the second one-way bearing (503). A roller (505) is rotatably mounted on one side of the rocker arm (501), and the roller (505) abuts against the eccentric wheel (504).

2. The sewing machine's drag wheel structure according to claim 1, characterized in that: The mop roller mechanism (3) includes an assembly block (301) rotatably mounted inside the mechanism housing (2) via a rotating component. A first rotating rod (309) is rotatably mounted on the assembly block (301) via a bearing. A first synchronous wheel (302) is mounted on the first rotating rod (309). A second synchronous wheel (303) that rotates synchronously with the first synchronous wheel (302) is mounted at one end of the first rotating rod (309). A second rotating rod (304) is rotatably mounted on the assembly block (301) via a bearing. One end of the second rotating rod (304) is equipped with... The drive mechanism (4) is equipped with a third synchronous pulley (305), and the other end of the second rotating rod (304) is fitted with a drag wheel (307) through a first one-way bearing (306). A first synchronous belt (308) is driven on the second synchronous pulley (303) and the third synchronous pulley (305). The drive mechanism (4) includes a drive motor (401). The output end of the drive motor (401) is fitted with a fourth synchronous pulley (402) through a coupling. A second synchronous belt (403) is driven on the fourth synchronous pulley (402) and the first synchronous pulley (302).

3. The sewing machine's drag wheel structure according to claim 1, characterized in that: The outer shell (2) of the mechanism is equipped with an adjustment mechanism (6) for adjusting the downward pressure of the drag wheel mechanism (3) on the fabric. The adjustment mechanism (6) includes an adjustment bolt (601) threadedly mounted on the outer shell (2). The adjustment bolt (601) has a through hole (602) in the center. It also includes a guide rod (603) mounted on the connecting rod (502). The guide rod (603) extends into the through hole (602). A first spring (604) is fitted on the outside of the guide rod (603). The bottom end of the adjustment bolt (601) abuts against the top end of the first spring (604).

4. The sewing machine's drag wheel structure according to claim 1, characterized in that: The housing (2) of the mechanism is equipped with a manual device (7) for manually lifting the mop wheel mechanism (3). The manual device (7) includes a mounting block (701) fixedly installed in the housing (2). A handle (702) is rotatably mounted on the mounting block (701) via a rotating component. One side of the handle (702) is a drive unit (703). One side of the connecting rod (502) is provided with a linkage bending part (704) that cooperates with the drive unit (703).

5. The sewing machine's drag wheel structure according to claim 1, characterized in that: The outer casing (2) of the mechanism is equipped with tension adjustment mechanisms (8) for adjusting the tension of the first synchronous belt (308) and the second synchronous belt (403) at the positions of the first synchronous belt (308) and the second synchronous belt (403). The tension adjustment mechanism (8) includes a rotatably disposed adjustment block (801). An arc-shaped adjustment hole (802) is provided on the adjustment block (801). An adjustment screw (803) for fixing the position of the adjustment block (801) is installed in the arc-shaped adjustment hole (802). A pulley (804) that cooperates with the first synchronous belt (308) and the second synchronous belt (403) is rotatably mounted on the adjustment block (801).

6. The sewing machine's drag wheel structure according to claim 1, characterized in that: The mop wheel mechanism (3) further includes a damping mechanism (9) for stabilizing the rotation of the mop wheel (307). The damping mechanism (9) includes a fixing block (901) fixedly disposed on one side of the assembly block (301). A damping block (902) is slidably guided on the inner wall of the fixing block (901). A second spring (903) is connected between the inner wall of the fixing block (901) and the damping block (902). One end of the damping block (902) is arc-shaped and cooperates with the mop wheel (307) to abut.

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