Adhesive sticker winding device

Abstract

The utility model belongs to the technical field of adhesive sticker winding devices, and particularly relates to an adhesive sticker winding device which comprises a winding device body and a fixing support, the fixing support is fixedly connected to the winding device body, two first sliding grooves are symmetrically formed in the inner wall of the fixing support, a supporting frame is connected between the two first sliding grooves in a sliding mode, and the supporting frame is fixedly connected to the winding device body. A roller is rotationally connected into the supporting frame. The two movable grooves are formed in the top surface of the supporting frame; the through groove is formed in the top face of the inner wall of the first rotating groove, two extrusion rods are rotationally connected into the through groove, and one ends of the two extrusion rods extend into the two movable grooves correspondingly and are movably connected with the two movable grooves; the self-adhesive label paper winding device solves the problems that when a user uses a winding device to wind self-adhesive label paper, the self-adhesive label paper can not be tightly attached and loosen in the winding process due to insufficient tension, and the uniformity and attractiveness of the label paper are affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-adhesive tape rolling devices, in particular to a self-adhesive tape rolling device. Background Art

[0002] The self-adhesive rewinding device is also called the self-adhesive label paper rewinding device. It is a device specially used to rewind the self-adhesive label paper into a roll product. This device plays a vital role in the production and processing of self-adhesive labels. It can ensure the orderly rewinding of label paper and facilitate subsequent storage, transportation and use.

[0003] For example, the Chinese patent with publication number CN217996204U discloses a self-adhesive label paper winding device, including a bracket, a rotating plate is rotatably connected to the top of the bracket, two rotating columns are rotatably connected to one surface of the rotating plate, two driving motors are fixedly connected to one surface of the rotating plate, one end of the driving motor output shaft is fixedly connected to the rotating column, a threaded screw is rotatably connected to the inner wall of the rotating column, a rotating knob is fixedly connected to one end of the threaded screw, a moving block is threadedly connected to the side surface of the threaded screw, a group of adjusting rods are hinged to the side surface of the moving block, a positioning block is hinged to one end of the adjusting rod, the side surface of the positioning block is slidably matched with the rotating column, and a positioning assembly is installed on the side surface of the bracket. The purpose of the utility model is to provide a self-adhesive label paper winding device to solve the problem of poor versatility and practicality of the existing winding device.

[0004] The above patent has the following problems:

[0005] This patent has some disadvantages when in use, such as: the above-mentioned winding device cannot adjust the tension of the self-adhesive label paper when in use. When the user uses the winding device to roll up the self-adhesive label paper, the self-adhesive label paper may not fit tightly during the rolling process due to insufficient tension, resulting in looseness, which affects the neatness and aesthetics of the label paper. In view of this, we propose a self-adhesive winding device. Utility Model Content

[0006] The purpose of the utility model is to provide a self-adhesive adhesive rolling device to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a self-adhesive adhesive rolling device, comprising:

[0008] A winding device body and a fixed bracket, wherein the fixed bracket is fixedly connected to the winding device body, two first slide grooves are symmetrically provided on the inner wall of the fixed bracket, a support frame is slidably connected between the two first slide grooves, and a roller is rotatably connected inside the support frame;

[0009] Two movable grooves, the two movable grooves are arranged on the top surface of the support frame;

[0010] A through groove, wherein the through groove is provided on the top surface of the inner wall of the first rotating groove, and two extrusion rods are rotatably connected in the through groove, and one end of the two extrusion rods respectively extends into the two movable grooves and is movably connected to the two movable grooves;

[0011] A driving assembly is located in the fixed bracket and is used to drive the two extrusion rods to rotate.

[0012] Based on the above structure, by setting the first slide groove and the support frame, it is ensured that the support frame can slide between the two first slide grooves, by setting the roller, it is ensured that the roller can rotate in the support frame, by setting the movable groove, the through groove and the extrusion rod, it is ensured that the two extrusion rods can rotate in the through groove. When the two extrusion rods rotate, one end of the two extrusion rods will respectively squeeze the two movable grooves to drive the support frame to move. At the same time, one end of the two extrusion rods will respectively slide in the two movable grooves. By setting the driving assembly, it is ensured that the user can drive the two extrusion rods to rotate through the driving assembly.

[0013] In the above technical solution, further, the driving component includes:

[0014] Two first rotating grooves, the two first rotating grooves are symmetrically arranged on the inner wall of the through groove, two first worm gears are rotatably connected in the two first rotating grooves, and the two first worm gears are respectively fixed to two extrusion rods;

[0015] A second rotating groove, the second rotating groove is provided in the fixed bracket and communicates with the two first rotating grooves, a first worm group meshing with the two first worm wheels is rotatably connected in the second rotating groove, a rotating rod is fixedly connected to one end of the first worm group, and one end of the rotating rod passes through the inner wall of the second rotating groove and extends to the outside to be rotatably connected to the fixed bracket;

[0016] The fixing assembly is located in the fixing bracket and is used to fix the rotating rod.

[0017] In this technical solution, it is ensured that the user can adjust the tension of the self-adhesive label paper according to usage requirements.

[0018] In the above technical solution, further, the fixing assembly includes:

[0019] A second slide groove, wherein the second slide groove is provided in the fixed bracket, wherein two extrusion blocks are slidably connected in the second slide groove, and the two extrusion blocks are respectively located on both sides of the rotating rod, and a bidirectional threaded rod is threadedly connected between the two extrusion blocks, and the bidirectional threaded rod is located in the second slide groove and is rotatably connected to the second slide groove;

[0020] A third rotating groove, the third rotating groove is arranged on the inner wall of the second sliding groove, a fourth rotating groove connected to the outside is arranged on the inner wall of the third rotating groove, a second worm gear is rotatably connected in the third rotating groove, and one end of the second worm gear extends into the second sliding groove and is fixed to one end of the bidirectional threaded rod, a second worm screw which rotates with the fourth rotating groove is meshed below the second worm gear, and one end of the second worm screw extends to the outside.

[0021] In this technical solution, it is ensured that the rotating rod can be fixed in the fixed bracket and cannot move, so as to prevent the rotating rod from rotating due to external influences.

[0022] In the above technical solution, further, the two sections of threads on the bidirectional threaded rod have opposite rotation directions.

[0023] In this technical solution, it is ensured that when the bidirectional threaded rod rotates, the two extrusion blocks are acted upon by the threads of the bidirectional threaded rod to move closer to or farther away from each other.

[0024] In the above technical solution, further, one end of the second worm gear is rotationally connected to the second sliding groove.

[0025] In this technical solution, it is ensured that one end of the second worm gear can rotate normally in the second sliding groove.

[0026] In the above technical solution, further, one end of the second worm is fixedly connected to a rotating wheel.

[0027] In this technical solution, it is ensured that the user can drive the second worm to rotate through the rotating wheel at one end of the second worm.

[0028] In the above technical solution, further, the first worm gear group consists of two first worm gears, and the two first worm gears have opposite rotation directions.

[0029] In this technical solution, it is ensured that when the first worm gear group rotates, it can drive the two first worm wheels to rotate in opposite directions.

[0030] Based on the above structure, the beneficial effects of the utility model are:

[0031] 1. The self-adhesive winding device ensures that the support frame can slide between the two first sliding grooves through the provided first sliding groove and the support frame, ensures that the roller can rotate in the support frame through the provided roller, and ensures that the two squeezing rods can rotate in the through groove through the provided movable groove, through the provided through groove and the extrusion rod. When the two extrusion rods rotate, one end of the two extrusion rods will respectively squeeze the two movable grooves to drive the support frame to move, and at the same time, one end of the two extrusion rods will respectively slide in the two movable grooves, and through the provided driving component, ensure that the user can drive the two extrusion rods to rotate through the driving component, thereby solving the problem that when the user uses the winding device to wind up the self-adhesive label paper, the self-adhesive label paper may not be tightly fitted during the winding process due to insufficient tension, resulting in looseness, affecting the neatness and aesthetics of the label paper.

[0032] 2. The adhesive tape reeling device, through the provision of a fixing assembly and a rotating rod, ensures that the user can fix the rotating rod in the fixing bracket through the fixing assembly so that it cannot rotate, thereby preventing the rotating rod from being affected by the outside world and rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0034] Figure 2 This is one of the internal structure schematic diagrams of the fixing bracket of the utility model;

[0035] Figure 3 This is the second schematic diagram of the internal structure of the fixing bracket of the utility model;

[0036] Figure 4 This is one of the regional structural diagrams of the second chute of the utility model;

[0037] Figure 5 This is the second regional structural diagram of the second chute of the utility model;

[0038] Figure 6 It is a partial exploded structure schematic diagram of the utility model.

[0039] The symbols in the figure are:

[0040] 1. Winding device body; 2. Fixed bracket; 3. First slide groove; 4. Support frame; 5. Roller; 6. Movable groove; 7. Through groove; 8. Extrusion rod; 9. First rotating groove; 10. First worm gear; 11. Second rotating groove; 12. First worm gear group; 13. Rotating rod; 14. Second slide groove; 15. Extrusion block; 16. Bidirectional threaded rod; 17. Third rotating groove; 18. Fourth rotating groove; 19. Second worm gear; 20. Second worm. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0042] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0044] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0045] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0046] Embodiment 1:

[0047] See also Figure 1 - Figure 6 As shown, this embodiment provides a self-adhesive tape rolling device, comprising:

[0048] A winding device body 1 and a fixed bracket 2, wherein the fixed bracket 2 is fixedly connected to the winding device body 1, and two first slide grooves 3 are symmetrically provided on the inner wall of the fixed bracket 2, a support frame 4 is slidably connected between the two first slide grooves 3, and a roller 5 is rotatably connected inside the support frame 4;

[0049] Two movable grooves 6, the two movable grooves 6 are opened on the top surface of the support frame 4;

[0050] A through slot 7, which is provided on the top surface of the inner wall of the first rotating slot 9, and two extrusion rods 8 are rotatably connected in the through slot 7, and one end of the two extrusion rods 8 respectively extends into the two movable slots 6 and is movably connected to the two movable slots 6;

[0051] The driving assembly is located in the fixed bracket 2 and is used to drive the two extrusion rods 8 to rotate.

[0052] Embodiment 2:

[0053] This embodiment provides a self-adhesive tape winding device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the driving component includes:

[0054] Two first rotating grooves 9, the two first rotating grooves 9 are symmetrically arranged on the inner wall of the through groove 7, two first worm gears 10 are rotatably connected in the two first rotating grooves 9, and the two first worm gears 10 are respectively fixed to the two extrusion rods 8;

[0055] A second rotating groove 11 is provided in the fixed bracket 2 and communicates with the two first rotating grooves 9. A first worm group 12 meshing with the two first worm wheels 10 is rotatably connected in the second rotating groove 11. A rotating rod 13 is fixedly connected to one end of the first worm group 12. One end of the rotating rod 13 penetrates the inner wall of the second rotating groove 11 and extends to the outside to be rotatably connected to the fixed bracket 2.

[0056] The fixing component is located in the fixing bracket 2 and is used to fix the rotating rod 13 .

[0057] Among them, the user rotates the rotating rod 13 by hand, so that the rotating rod 13 drives the first worm group 12 to rotate in the second rotating groove 11. When the first worm group 12 rotates, the first worm group 12 will drive the two first worm wheels 10 to rotate in opposite directions in the two first rotating grooves 9 respectively, so that the two first worm wheels 10 respectively drive the two extrusion rods 8 to rotate in opposite directions in the through groove 7, so that one end of the two extrusion rods 8 respectively squeezes the two movable grooves 6 and slides in the two movable grooves 6 respectively, driving the support frame 4 to move downward along the two first slide grooves 3, and allowing the support frame 4 to drive the roller 5 to move downward, ensuring that the user can adjust the tension of the self-adhesive label paper according to usage requirements.

[0058] Embodiment 3:

[0059] This embodiment provides a self-adhesive tape winding device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the fixing component includes:

[0060] A second slide groove 14 is provided in the fixed bracket 2, two extrusion blocks 15 are slidably connected in the second slide groove 14, and the two extrusion blocks 15 are respectively located on both sides of the rotating rod 13, a bidirectional threaded rod 16 is threadedly connected between the two extrusion blocks 15, and the bidirectional threaded rod 16 is located in the second slide groove 14 and is rotatably connected to the second slide groove 14;

[0061] A third rotating groove 17 is provided on the inner wall of the second slide groove 14. A fourth rotating groove 18 connected to the outside is provided on the inner wall of the third rotating groove 17. A second worm gear 19 is rotatably connected in the third rotating groove 17, and one end of the second worm gear 19 extends into the second slide groove 14 and is fixed to one end of the bidirectional threaded rod 16. A second worm 20 that rotates with the fourth rotating groove 18 is meshed with the lower part of the second worm gear 19, and one end of the second worm gear 20 extends to the outside.

[0062] When the user needs to release the fixation of the rotating rod 13, the user rotates the second worm 20 by hand, so that the second worm 20 drives the second worm wheel 19 to rotate in the third rotating groove 17, so that the second worm wheel 19 drives the bidirectional threaded rod 16 to rotate in the second sliding groove 14. When the bidirectional threaded rod 16 rotates, the two extrusion blocks 15 will be respectively affected by the two sections of oppositely rotating threads on the bidirectional threaded rod 16 and move away from each other. When the two extrusion blocks 15 move away from each other, the fixation of the rotating rod 13 will be released. When the user needs to fix the rotating rod 13, the user rotates the second worm 20 in the opposite direction by hand to make the second worm wheel 19 drive the bidirectional threaded rod 16 to rotate in the second sliding groove 14. The second worm gear 20 drives the second worm wheel 19 to rotate in the opposite direction in the third rotating groove 17, so that the second worm wheel 19 drives the bidirectional threaded rod 16 to rotate in the opposite direction in the second sliding groove 14. When the bidirectional threaded rod 16 rotates in the opposite direction, the two extrusion blocks 15 will be respectively affected by the two sections of oppositely rotating threads on the bidirectional threaded rod 16 and approach each other. When the two extrusion blocks 15 move to a position where they cannot move, the rotating rod 13 will be fixed in the fixed bracket 2 by the two extrusion blocks 15 and cannot rotate, ensuring that the rotating rod 13 can be fixed in the fixed bracket 2 and cannot move, preventing the rotating rod 13 from being rotated by external influences.

[0063] Embodiment 4:

[0064] This embodiment provides a self-adhesive adhesive tape winding device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the two sections of threads on the bidirectional threaded rod 16 have opposite rotation directions.

[0065] It is ensured that when the bidirectional threaded rod 16 rotates, the two extrusion blocks 15 are moved closer to or farther away from each other by the threads of the bidirectional threaded rod 16 .

[0066] Embodiment 5:

[0067] This embodiment provides a self-adhesive tape winding device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: one end of the second worm gear 19 is rotatably connected to the second slide groove 14.

[0068] Here, it is ensured that one end of the second worm gear 19 can rotate normally in the second sliding groove 14 .

[0069] Embodiment 6:

[0070] This embodiment provides a self-adhesive tape winding device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: one end of the second worm 20 is fixedly connected to a rotating wheel.

[0071] Here, it is ensured that the user can drive the second worm 20 to rotate through the rotating wheel at one end of the second worm 20 .

[0072] Embodiment 7:

[0073] This embodiment provides a self-adhesive tape winding device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the first worm gear group 12 is composed of two first worm gears, and the two first worm gears rotate in opposite directions.

[0074] It is ensured that when the first worm gear set 12 rotates, the two first worm wheels 10 can be driven to rotate in opposite directions.

[0075] When in use, the user passes the self-adhesive label paper through the inner cavity of the fixed bracket 2 and is located below the movable groove 6, and then sends it into the winding device body 1 for winding. Then the user rotates the second worm 20 by hand, so that the second worm 20 drives the second worm wheel 19 to rotate in the third rotating groove 17, so that the second worm wheel 19 drives the bidirectional threaded rod 16 to rotate in the second sliding groove 14. When the bidirectional threaded rod 16 rotates, the two extrusion blocks 15 will be respectively affected by the two sections of oppositely rotating threads on the bidirectional threaded rod 16 and move away from each other. When the two extrusion blocks 15 move away from each other, the fixation of the rotating rod 13 will be released. Then the user rotates the rotating rod 13 by hand, so that the rotating rod 13 drives the first worm group 12 to rotate in the second rotating groove 11. When the first worm group 12 rotates, the first worm group 12 will drive the two first worm wheels 10 to rotate in opposite directions in the two first rotating grooves 9 respectively, so that the two first worm wheels 10 respectively drive the two extrusion rods 8 in opposite directions in the through groove 7. Rotate, let one end of the two squeezing rods 8 squeeze the two movable grooves 6 respectively and slide in the two movable grooves 6 respectively, drive the support frame 4 to move downward along the two first slide grooves 3, let the support frame 4 drive the roller 5 to move downward, ensure that the user can adjust the tension of the self-adhesive label paper according to the use requirements, after the adjustment is completed, the user manually rotates the second worm gear 20 in the opposite direction, let the second worm gear 20 drive the second worm gear 19 to rotate in the opposite direction in the third rotation groove 17, so that the second worm gear 19 drives the bidirectional threaded rod 16 to rotate in the second slide groove 14 in the opposite direction. When the bidirectional threaded rod 16 rotates in the opposite direction, the two squeezing blocks 15 will be respectively affected by the two sections of oppositely rotating threads on the bidirectional threaded rod 16 and approach each other. When the two squeezing blocks 15 move to a position where they cannot move, the rotating rod 13 will be fixed in the fixed bracket 2 by the two squeezing blocks 15 and cannot rotate, ensuring that the rotating rod 13 can be fixed in the fixed bracket 2 and cannot move, preventing the rotating rod 13 from being rotated by the external influence.

[0076] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A self-adhesive tape winding device, characterized in that: include: A winding device body (1) and a fixed bracket (2), wherein the fixed bracket (2) is fixedly connected to the winding device body (1), two first sliding grooves (3) are symmetrically provided on the inner wall of the fixed bracket (2), a support frame (4) is slidably connected between the two first sliding grooves (3), and a roller (5) is rotatably connected inside the support frame (4); Two movable grooves (6), the two movable grooves (6) being arranged on the top surface of the support frame (4); A through groove (7), wherein the through groove (7) is formed on the top surface of the inner wall of the first rotating groove (9), and two extrusion rods (8) are rotatably connected in the through groove (7), and one end of the two extrusion rods (8) respectively extends into the two movable grooves (6) and is movably connected to the two movable grooves (6); A driving assembly is located in the fixed bracket (2) and is used to drive the two extrusion rods (8) to rotate.

2. The adhesive tape reeling device according to claim 1, characterized in that: The drive assembly comprises: Two first rotating grooves (9), the two first rotating grooves (9) are symmetrically arranged on the inner wall of the through groove (7), two first worm gears (10) are rotatably connected in the two first rotating grooves (9), and the two first worm gears (10) are respectively fixed to the two extrusion rods (8); A second rotating groove (11), the second rotating groove (11) is provided in the fixed bracket (2) and is connected to the two first rotating grooves (9), a first worm gear group (12) meshing with the two first worm wheels (10) is rotatably connected in the second rotating groove (11), a rotating rod (13) is fixedly connected to one end of the first worm gear group (12), and one end of the rotating rod (13) passes through the inner wall of the second rotating groove (11) and extends to the outside to be rotatably connected to the fixed bracket (2); A fixing component is located in the fixing bracket (2) and is used to fix the rotating rod (13).

3. The adhesive tape reeling device according to claim 2, characterized in that: The fixing assembly comprises: A second slide groove (14), wherein the second slide groove (14) is provided in the fixed bracket (2), wherein two extrusion blocks (15) are slidably connected in the second slide groove (14), and the two extrusion blocks (15) are respectively located on both sides of the rotating rod (13), and a bidirectional threaded rod (16) is threadedly connected between the two extrusion blocks (15), and the bidirectional threaded rod (16) is located in the second slide groove (14) and is rotatably connected to the second slide groove (14); A third rotating groove (17), wherein the third rotating groove (17) is provided on the inner wall of the second sliding groove (14), and a fourth rotating groove (18) connected to the outside is provided on the inner wall of the third rotating groove (17), a second worm gear (19) is rotatably connected in the third rotating groove (17), and one end of the second worm gear (19) extends into the second sliding groove (14) and is fixed to one end of the bidirectional threaded rod (16), and a second worm (20) is meshed with the fourth rotating groove (18) and rotated below the second worm gear (19), and one end of the second worm gear (20) extends to the outside.

4. The adhesive tape reeling device according to claim 3, characterized in that: The two sections of threads on the bidirectional threaded rod (16) have opposite rotation directions.

5. The adhesive tape reeling device according to claim 3, characterized in that: One end of the second worm gear (19) is rotationally connected to the second sliding groove (14).

6. The adhesive tape reeling device according to claim 3, characterized in that: One end of the second worm (20) is fixedly connected to a rotating wheel.

7. The adhesive tape reeling device according to claim 2, characterized in that: The first worm gear group (12) consists of two first worm gears, and the two first worm gears have opposite rotation directions.

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