Transverse moving structure of automatic bottom line replacing device

Abstract

The utility model discloses a transverse moving structure of an automatic bottom thread changing device, which belongs to the technical field of embroidery equipment and comprises a synchronous belt, a transverse moving mechanism, a transverse moving mechanism and a transverse moving mechanism, and the synchronous belt extends transversely and is in a fixed state relative to the automatic bottom thread changing device; the synchronous belt wheel is meshed with the synchronous belt, so that the synchronous belt wheel moves in the transverse extension direction of the synchronous belt and drives the automatic bottom line replacing device to transversely move; and the driving motor drives the synchronous belt wheel to rotate. Due to the fact that the synchronous belt wheel is flexibly connected with the synchronous belt, the requirement for the installation precision of the synchronous belt is low, the requirement for the installation precision is lowered while the transverse moving precision is guaranteed, and the overall cost is reduced.

Description

Technical field

[0001] The utility model belongs to the technical field of embroidery equipment, and particularly relates to an automatic bobbin thread changing device for an embroidery machine. [Background Technology]

[0002] Currently available automatic bobbin changing devices achieve this by automatically replacing the bobbin case and bobbin core. Referring to Chinese utility model patent CN210215827U, a multi-station automatic bobbin case changing system is disclosed. The system comprises a horizontal guide mechanism and a bobbin case changing device. The horizontal guide mechanism is positioned below the bobbin case of an embroidery machine and extends along the line connecting the bobbin cases. The bobbin case changing device includes a bobbin case grabbing unit, a bobbin case storage unit, and a translational drive unit. The translational drive unit is slidably connected to the horizontal guide mechanism and can translate along the horizontal guide mechanism. The bobbin case storage unit includes a detachably rotatable storage turntable with several bobbin case storage stations positioned around the storage turntable. The horizontal guide mechanism comprises several linear horizontal guide rails and a linear rack. The translational drive unit comprises a third baseplate, a third servo motor, a drive gear, and a sliding guide seat. The third servo motor and the sliding guide seat are mounted on the third baseplate. The third servo motor is connected to the drive gear. The sliding guide seat is slidably connected to the horizontal guide rails, along which a linear rack is positioned. The drive gear engages the linear rack. Its horizontal guide mechanism adopts the method of driving gear meshing with linear rack, but the overall length of the horizontal guide mechanism is relatively long. In order to ensure that the driving gear and the linear rack maintain a good meshing state, the manufacturing and installation precision requirements are high (the rack needs to be leveled, otherwise its precision will be affected), so the cost is also high. [Utility Model Content]

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a transverse movement structure of an automatic bottom thread changing device, thereby reducing the requirements for installation accuracy and lowering the overall cost.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] Firstly, one of the options is:

[0006] The traverse structure of the automatic bottom thread changing device includes:

[0007] A synchronous belt extending in a transverse direction and being fixed relative to the automatic bottom thread changing device;

[0008] A synchronous pulley, which engages with the synchronous belt and moves in the lateral direction of the synchronous belt.

[0009] And drive the automatic bottom thread changing device to move horizontally;

[0010] A driving motor drives the active synchronous pulley to rotate.

[0011] Preferably, the transverse shift structure further includes a pulley pressure roller, which presses the synchronous belt onto the synchronous pulley.

[0012] Preferably, the transverse movement structure further includes at least two synchronous belt brackets arranged at intervals along the transverse direction, and the synchronous belt brackets are provided with a belt supporting surface for supporting the synchronous belt.

[0013] Preferably, the synchronous belt bracket includes a fixed part and an avoidance part that can move relative to the fixed part, and the belt supporting surface is arranged on the avoidance part; when the automatic bottom line changing device passes through the synchronous belt bracket, the avoidance part moves away from the synchronous belt to make the belt supporting surface separate from the synchronous belt, and when the automatic bottom line changing device passes over the synchronous belt bracket, the avoidance part returns to its position so that the belt supporting surface supports the synchronous belt.

[0014] Preferably, a longitudinal slide rail is connected between the avoidance portion and the fixing portion.

[0015] Preferably, the automatic bottom thread changing device is provided with a guide member, and when the automatic bottom thread changing device passes through the synchronous belt bracket, the guide member guides the avoidance portion to move away from the synchronous belt.

[0016] Preferably, the guide member is provided with a guide surface acting with the avoidance portion, and the guide surface comprises a straight surface extending along a transverse straight line and two inclined surfaces corresponding to the two transverse ends of the straight surface.

[0017] Preferably, the fixing portion is connected to a roller that cooperates with the guide surface; and / or a return spring is connected between the avoidance portion and the fixing portion.

[0018] At the same time, another alternative solution is provided:

[0019] The traverse structure of the automatic bottom thread changing device includes:

[0020] a chain extending in a transverse direction and being fixed relative to the automatic bottom thread changing device;

[0021] a sprocket, the sprocket being engaged with the chain, thereby moving in a lateral extension direction of the chain and driving the automatic bottom thread changing device to move lateraly;

[0022] A driving motor drives the sprocket to rotate.

[0023] In addition, another alternative solution is provided:

[0024] The traverse structure of the automatic bottom thread changing device includes:

[0025] A flexible belt extending in a transverse direction and being fixed relative to the automatic bottom thread changing device;

[0026] A driving wheel, wherein the flexible belt is provided with a winding section wound around the driving wheel. The driving wheel changes the winding section of the flexible belt and the driving wheel through forward and reverse motion, thereby moving along the lateral extension direction of the flexible belt and driving the automatic bottom thread changing device to move lateraly;

[0027] A driving motor drives the driving wheel to rotate.

[0028] This utility model employs the above-mentioned technical solution, achieving the following technical effects: A drive method in which a synchronous pulley meshes with a synchronous belt causes the synchronous pulley to move along the lateral extension of the synchronous belt, thereby driving the lateral movement of the automatic bottom thread changing device. Because the synchronous pulley and the synchronous belt are flexibly connected, the requirements for synchronous belt installation precision are lower. This reduces the installation precision requirement while ensuring lateral movement accuracy, thereby reducing overall costs. Similarly, a drive method using a sprocket and chain, or a drive pulley and a flexible belt, can also achieve similar effects.

[0029] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0030] The utility model is further described below with reference to the accompanying drawings:

[0031] Figure 1 This is a partial structural diagram of a multi-station automatic bottom thread changing device;

[0032] Figure 2 yes Figure 1 A in the middle is an enlarged structural diagram;

[0033] Figure 3 This is a partial structural diagram of a multi-station automatic bottom thread changing device;

[0034] Figure 4 yes Figure 3 The enlarged structural diagram at B in the middle;

[0035] Figure 5 This is a partial structural diagram of a multi-station automatic bottom thread changing device;

[0036] Figure 6 yes Figure 5 The enlarged structural diagram at C in the middle;

[0037] Figure 7 is a structural diagram of another embodiment;

[0038] Figure 8 yes Figure 7 The enlarged structural diagram at D in the middle;

[0039] Figure markings: automatic bottom thread changing device 1, main body 11, storage tray 12, manipulator assembly 13, transverse slider 14, drive motor 15, synchronous pulley 16, pulley pressure roller 17, guide 18, straight surface 181, inclined surface 182, driving wheel 19, transverse guide mechanism 2, bracket 20, mounting groove 201, transverse guide rail 21, synchronous belt 22, synchronous belt bracket 23, fixing part 231, avoidance part 232, belt supporting surface 2321, longitudinal slide rail mechanism 233, return spring 234, transverse screw 235, limit plate 236, roller 237, mounting plate 238, vertical screw 239, wire rope 24. [Specific implementation method]

[0040] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0041] It will be understood by those skilled in the art that, unless there is any conflict, the features in the following embodiments and implementations may be combined with each other.

[0042] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model. For example, the terms "upper," "lower," "front," "rear," "X-direction," "Y-direction," and the like, which indicate orientation or positional relationships, are based solely on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the utility model. They do not indicate or imply that the device or element referred to must have a specific orientation or be constructed or operated in a specific orientation. Therefore, they should not be construed as limiting the utility model.

[0043] In this utility model, unless otherwise specified or limited, the terms "installation," "connection," "fixation," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0044] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0045] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0046] refer to Figures 1 to 6 As shown and in conjunction with prior art, the multi-station automatic bobbin changing device includes a transverse guide mechanism 2 and an automatic bobbin changing device 1. For multi-head embroidery machines, multiple machine head and shuttle housing combinations are arranged horizontally, with the machine head at the top and the shuttle housing at the bottom. The shuttle housing houses the rotary hook and the bobbin thread mounted on it. The bobbin thread here refers to the bobbin core and bobbin case combination that holds the bobbin thread. When the bobbin thread runs out, it needs to be replaced, and the automatic bobbin changing device 1 is used to do this. The transverse guide mechanism 2 is positioned below the shuttle housing and extends horizontally, sufficient to cover the length of all shuttle housings. This ensures that the automatic bobbin changing device 1 can move along the transverse guide mechanism 2 and reach the corresponding position in the shuttle housing to complete the bobbin thread changing process. The number of automatic bobbin changing devices 1 can be one or more. As the number of heads in multi-head embroidery machines increases, multiple automatic bobbin changing devices 1 are typically installed, each responsible for changing the bobbin thread for a corresponding number of machine head and shuttle housing combinations.

[0047] The automatic bobbin thread changing device 1 includes a storage tray 12 for placing multiple bobbin threads and a manipulator assembly 13 for automatically changing the bobbin thread. The storage tray 12 and the manipulator assembly 13 are mounted on the body 11. The storage tray 12 can rotate. The storage tray is provided with multiple storage positions for placing bobbin threads along the circumference, and at least one empty position is reserved. The manipulator assembly 13 replaces the used bobbin thread on the rotary hook and places it on the empty position of the storage tray 12, and places the unused bobbin thread on the storage tray 12 on the rotary hook. Of course, if there is no unused bobbin thread on the storage tray, the entire storage tray needs to be replaced.

[0048] Therefore, the method used by the prior art automatic bobbin changing device 1 to change the bobbin thread is as follows: a storage tray is equipped with a bobbin core and a bobbin case with a pre-wound bobbin thread, referred to herein as a bobbin thread, which generally stores 10 pre-wound bobbins, and a space is reserved for the next bobbin thread to be replaced. When the bobbin thread needs to be replaced, the manipulator assembly 13 removes the empty bobbin thread from the shuttle on the embroidery machine and places it in the space reserved in the storage tray. Then, the manipulator assembly 13 is lifted, and the storage tray 12 rotates, rotating the pre-wound bobbin thread to a position where the manipulator assembly 13 can grab it. At this time, the manipulator assembly 13 grabs a pre-wound bobbin thread and places it in the shuttle of the embroidery machine, completing the replacement of the bobbin thread of one head of the embroidery machine. When the bobbin thread corresponding to the next head needs to be replaced, the automatic bobbin thread changing device with the storage tray 12 moves along the transverse guide mechanism 2 to the next head position, and then the manipulator assembly 13 repeats the cycle of the first head bobbin thread replacement action to complete the replacement of the second head bobbin thread, and so on, completing the replacement of the corresponding bobbin threads of the entire embroidery machine head.

[0049] Embroidery machines typically have different numbers of automatic bobbin changers depending on the number of heads. Currently, there's typically one automatic bobbin changer for every ten heads. Once the entire machine's bobbin thread is replaced, all the automatic bobbin changers move along the transverse guide mechanism 2 to one end of the machine, waiting for the worker to replace the empty bobbin storage tray with a fully wound one. Once the replacement is complete, the reset button is manually pressed to reset each automatic bobbin changer to its initial position, ready for the next job. This completes the machine's automatic bobbin change function.

[0050] In order to realize the lateral movement of the automatic bobbin thread changing device 1 along the lateral guide mechanism 2, a power drive component is provided on the automatic bobbin thread changing device 1. The power drive component cooperates with the lateral guide mechanism 2 to realize the lateral movement of the automatic bobbin thread changing device along the lateral guide mechanism 2. Therefore, the power drive component cooperates with the lateral guide mechanism 2 to form a lateral movement structure of the automatic bobbin thread changing device.

[0051] With reference to the prior art, the transverse guide mechanism 2 includes a bracket 20 and a transverse guide rail 21 mounted on the front of the bracket. The automatic bottom thread changing device 1 is provided with a transverse slider 14 that is slidably engaged with the transverse guide rail 21 .

[0052] In this embodiment, the lateral movement structure of the automatic bottom thread changing device includes:

[0053] Synchronous belt 22, described synchronous belt 22 extends in the horizontal direction, and is in fixed state with respect to the automatic bottom thread changing device. Here synchronous belt is not as conventional as closed loop, but horizontally extends in the horizontal direction, is positioned at the below of transverse guide rail 21.

[0054] The synchronous pulley 16 is provided on the automatic bobbin thread changing device 1. The synchronous pulley 16 is engaged with the synchronous belt 22, thereby moving along the lateral extension direction of the synchronous belt and driving the automatic bobbin thread changing device to move lateral;

[0055] A drive motor 15 is provided on the automatic bobbin thread changing device 1 to rotate a synchronous pulley 16. The motor shaft can be directly connected to the synchronous pulley, with the motor axis oriented longitudinally and perpendicular to the lateral extension of the synchronous belt 22. Alternatively, a reduction gearbox or other transmission structure can be added between the motor shaft and the synchronous pulley.

[0056] To ensure that the synchronous pulleys remain engaged with the synchronous belt, the transverse shifting mechanism may also include a pulley pressure roller 17, which presses the synchronous belt onto the synchronous pulleys. Two pulley pressure rollers 17 may be provided for each synchronous pulley, arranged in a "pin" pattern with the synchronous pulleys. In this embodiment, the two pulley pressure rollers 17 are located above the synchronous pulleys.

[0057] Since the synchronous belt is flexible and has a long horizontal extension, in order to ensure that the synchronous belt remains approximately straight, at least two synchronous belt brackets 23 are arranged at intervals along the horizontal direction. The synchronous belt bracket 23 has a belt supporting surface 2321 that supports the synchronous belt 22.

[0058] Due to the positional relationship between the pulley pressure roller, the synchronous belt, and the synchronous pulley, as well as the configuration of the synchronous belt bracket 23, the automatic bottom thread changing device 1 needs to have a belt support surface 2321 positioned to clear the synchronous belt when passing through the synchronous belt bracket 23. To this end, the synchronous belt bracket 23 is provided with a clearance structure. The synchronous belt bracket 23 includes a fixed portion 231 and a clearance portion 232 movable relative to the fixed portion. The belt support surface 2321 is located in the clearance portion. When the automatic bottom thread changing device passes through the synchronous belt bracket, the clearance portion moves away from the synchronous belt to allow the belt support surface to disengage from the synchronous belt. After the automatic bottom thread changing device passes over the synchronous belt bracket, the clearance portion returns to its original position, allowing the belt support surface to support the synchronous belt.

[0059] In order to guide the movement of the avoidance part, a longitudinal slide rail mechanism 233 is connected between the avoidance part and the fixed part. The avoidance part can slide longitudinally along the longitudinal slide rail mechanism 233. The structure of the longitudinal slide rail mechanism 233 can refer to the existing technology, such as the structure of the slider and the guide rail. Here, the avoidance part automatically performs the avoidance action, wherein the automatic bottom line changing device is provided with a guide member 18. When the automatic bottom line changing device passes through the synchronous belt bracket, the guide member guides the avoidance part to move away from the synchronous belt. Specifically, the guide member 18 is located below the synchronous belt pulley and is arranged in a flat plate shape. The guide member is provided with a guide surface that acts with the avoidance part. The guide surface includes a straight surface 181 extending along a horizontal straight line and two inclined surfaces 182 corresponding to the two horizontal ends of the straight surface. The fixed part is connected to a roller 237 that cooperates with the guide surface. A return spring 234 is connected between the avoidance part and the fixed part. Because the straight surface 181 protrudes forward relative to the two inclined surfaces 182, when the roller passes the first inclined surface and moves toward the straight surface, it pushes the avoidance portion to move away from the synchronous belt. When the roller moves along the straight surface, the avoidance portion and the synchronous belt are separated. After the roller passes the straight surface and moves along the second inclined surface, the return spring 234 pulls the avoidance portion to begin returning. Finally, after the roller has completely traveled along the second inclined surface, the avoidance portion is fully returned. Here, a return spring is provided on each side of the avoidance portion. One end of the return spring is connected to a vertical screw 239 and the other end is connected to a transverse screw 235, wherein the vertical screw is fixed to the fixed portion, and the vertical screw is fixed to the avoidance portion. In addition, a limit plate 236 is connected to each side of the fixed portion. The limit plate has a longitudinal limit slot, and the transverse screw 235 passes through the longitudinal limit slot. Therefore, when the avoidance portion moves, the transverse screw 235 moves along the longitudinal limit slot, and the longitudinal limit slot limits the displacement of the avoidance portion on both sides.

[0060] Specifically, the fixing portion 231 is an L-shaped structure having a vertical section and a horizontal section, wherein the vertical section is fixed to the mounting plate 238. The mounting plate is fixed to the back of the bracket, which has a laterally extending mounting slot 201, such as a T-slot, on the back of the bracket. The mounting plate is fixed to the mounting slot using mounting bolts. The fixing position of the mounting plate can be adjusted laterally, thereby adjusting the spacing between two adjacent synchronous belt brackets 23 as needed.

[0061] As for the power supply method of the power drive component, the existing technology is to set a contact power supply structure between the automatic bottom thread changing device 1 and the transverse guide mechanism 2, that is, the brush contacts the conductive sheet, but there is a risk of getting stuck and not conducting electricity.

[0062] In order to avoid the risk of jamming and non-conductivity caused by the prior art using brushes and conductive sheets for electrical conduction, as one embodiment, a contact power supply structure can be omitted. Instead, each automatic bobbin changing device 1 is provided with a power battery (not shown in the figure, but can be provided inside the body). The power battery is used to power the drive motor 15, eliminating the need for contact power supply. During operation, the power supply part of the automatic bobbin changing device does not contact the lateral guide mechanism, thus avoiding problems caused by power supply during operation of the automatic bobbin changing device on the lateral guide mechanism.

[0063] To charge the power battery, the transverse guide mechanism 2 includes a contact charging cradle mounted in a fixed position on one side of the transverse guide rail. The automatic bobbin thread changing device 1 is provided with a charging port, which engages with the charging connector to charge the power battery. Alternatively, one of the contact charging cradle and the automatic bobbin thread changing device may be provided with a charging port, while the other may be provided with a charging connector. Alternatively, wireless charging technology may be employed, with the transverse guide mechanism 2 provided with a wireless charging cradle and the automatic bobbin thread changing device 1 provided with a wireless charging circuit, wirelessly connected to the wireless charging cradle to charge the power battery. In this manner, the automatic bobbin thread changing device 1 can be charged while in standby mode.

[0064] Preferably, the drive motor is a stepping motor, the power battery is a lithium battery, and the drive motor is installed at the bottom of the automatic bottom thread changing device.

[0065] It is understood that the timing belt and timing pulleys can also be replaced with chains and sprockets, including:

[0066] a chain extending in a transverse direction and being fixed relative to the automatic bottom thread changing device;

[0067] a sprocket, the sprocket being engaged with the chain, thereby moving in a lateral extension direction of the chain and driving the automatic bottom thread changing device to move lateraly;

[0068] A driving motor drives the sprocket to rotate.

[0069] like Figure 7 and Figure 8 As shown, in another embodiment, the synchronous belt and the synchronous pulley are replaced by a flexible belt and a driving pulley 19, and the traverse structure of the automatic bottom thread changing device includes:

[0070] A flexible belt extending in a transverse direction and being fixed relative to the automatic bottom thread changing device;

[0071] A driving wheel, wherein the flexible belt is provided with a winding section wound around the driving wheel. The driving wheel changes the winding section of the flexible belt and the driving wheel through forward and reverse motion, thereby moving along the lateral extension direction of the flexible belt and driving the automatic bottom thread changing device to move lateraly;

[0072] A driving motor drives the driving wheel to rotate.

[0073] Preferably, the flexible belt can be tightened and fixed at both ends, and multiple driving pulleys of the automatic bottom thread changing device in the middle can provide support for it. The flexible belt is made of steel wire rope 24, which is strong, light, operates smoothly, is not prone to sudden breakage, and operates reliably. Of course, other flexible materials can also be used.

[0074] In addition, the driving wheel is provided with anti-skid patterns around its circumference, for example, a structure similar to a synchronous pulley, to increase the force between the driving wheel and the wire rope and avoid slipping.

[0075] In the above embodiment, since the synchronous pulley and the synchronous belt are flexibly connected, the requirements for the installation accuracy of the synchronous belt are lower. This reduces the installation accuracy requirements while ensuring lateral accuracy, thereby reducing overall costs. Similarly, the transmission method of sprocket and chain or the transmission method of driving wheel and flexible belt can also achieve similar effects.

[0076] The above description is merely a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. Those skilled in the art will understand that the utility model includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the utility model are intended to be included within the scope of the claims.

Claims

1. The lateral movement structure of the automatic bottom thread changing device is characterized by: include: A synchronous belt extending in a transverse direction and being fixed relative to the automatic bottom thread changing device; A synchronous pulley, which is engaged with the synchronous belt, thereby moving along the lateral extension direction of the synchronous belt and driving the automatic bottom thread changing device to move lateraly; A driving motor drives the synchronous pulley to rotate.

2. The lateral movement structure of the automatic bottom thread changing device according to claim 1 is characterized in that: The transverse shift structure further comprises a pulley pressure roller, which presses the synchronous belt onto the synchronous pulley.

3. The lateral movement structure of the automatic bottom thread changing device according to claim 1, characterized in that: The transverse movement structure further includes at least two synchronous belt brackets arranged at intervals in the transverse direction, and the synchronous belt brackets are provided with a belt supporting surface for supporting the synchronous belt.

4. The lateral movement structure of the automatic bottom thread changing device according to claim 3 is characterized in that: The synchronous belt bracket includes a fixed part and an avoidance part that can move relative to the fixed part, and the belt supporting surface is arranged on the avoidance part; when the automatic bottom line changing device passes through the synchronous belt bracket, the avoidance part moves away from the synchronous belt to make the belt supporting surface separate from the synchronous belt, and when the automatic bottom line changing device passes over the synchronous belt bracket, the avoidance part returns to its position so that the belt supporting surface supports the synchronous belt.

5. The lateral movement structure of the automatic bottom thread changing device according to claim 4, characterized in that: A longitudinal slide rail is connected between the avoidance portion and the fixing portion.

6. The lateral movement structure of the automatic bottom thread changing device according to claim 4, characterized in that: The automatic bobbin thread changing device is provided with a guide member. When the automatic bobbin thread changing device passes through the synchronous belt bracket, the guide member guides the avoidance portion to move in a direction away from the synchronous belt.

7. The lateral movement structure of the automatic bottom thread changing device according to claim 6, characterized in that: The guide member is provided with a guide surface that acts on the avoidance portion, and the guide surface includes a straight surface extending along a transverse straight line and two inclined surfaces corresponding to the two transverse ends of the straight surface.

8. The lateral movement structure of the automatic bottom thread changing device according to claim 7, characterized in that: The fixing portion is connected to a roller that cooperates with the guide surface; and / or a return spring is connected between the avoidance portion and the fixing portion.

9. The lateral movement structure of the automatic bottom thread changing device is characterized by: include: a chain extending in a transverse direction and being fixed relative to the automatic bottom thread changing device; a sprocket, the sprocket being engaged with the chain, thereby moving in a lateral extension direction of the chain and driving the automatic bottom thread changing device to move lateraly; A driving motor drives the sprocket to rotate.

10. The lateral movement structure of the automatic bottom thread changing device is characterized by: include: A flexible belt extending in a transverse direction and being fixed relative to the automatic bottom thread changing device; A driving wheel, wherein the flexible belt is provided with a winding section wound around the driving wheel. The driving wheel changes the winding section of the flexible belt and the driving wheel through forward and reverse motion, thereby moving along the lateral extension direction of the flexible belt and driving the automatic bottom thread changing device to move lateraly; A driving motor drives the driving wheel to rotate.

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