Traction mechanism and labeling machine

Abstract

The utility model belongs to the technical field of labeling machines, and discloses a traction mechanism and a labeling machine, the traction mechanism comprises a mounting rack, a driving roller, a first driven roller and a second driven roller, the driving roller, the first driven roller and the second driven roller are respectively and rotatably connected with the mounting rack and are sequentially arranged along a moving path of label paper to be pulled; the driving roller comprises a driving shaft and a driving roller fixedly arranged on the driving shaft in a sleeving mode, each of the first driven roller and the second driven roller comprises a driven shaft and a driven roller rotationally arranged on the driven shaft in a sleeving mode, the driven shafts are eccentric shafts, the traction mechanism further comprises an adjusting assembly, and the adjusting assembly comprises an adjusting piece, an elastic piece and a connecting piece; the first end of the connecting piece is fixedly connected with the driven shaft, the adjusting piece is adjustably arranged on the mounting frame, one end of the elastic piece is connected to the adjusting piece, the other end of the elastic piece is connected to the second end of the connecting piece, and the adjusting piece can drive the connecting piece to apply torque to the driven shaft through the elastic piece so that the driven shaft can rotate in the direction close to the driving shaft.

Description

Technical Field

[0001] This utility model relates to the field of labeling machine technology, and in particular to a traction mechanism and a labeling machine. Background Technology

[0002] During the operation of a labeling machine, stable label feeding is crucial for ensuring labeling accuracy and yield. The traction mechanism of the labeling machine uses the friction between two adjacent rollers to pull the label paper clamped between them. One roller is the drive roller connected to the motor, and the other is the driven roller. At the unwinding point, a spring friction mechanism is usually provided to provide braking force to prevent the unwinding reel from unwinding too much due to inertia. At the rewinding point, a rewinding motor is installed to rewind the label paper or packaging material after the labeling process, so that it is orderly wound onto the rewinding reel. When the distance between the drive and driven rollers is too large, the friction force on the label paper is less than the braking force at the unwinding point, or less than the force applied to the label paper by the motor at the rewinding point. This will cause slippage between the label paper and the rollers, resulting in decreased labeling accuracy and affecting the yield. When the distance between the drive and driven rollers is too small, the clamping force between the drive and driven rollers is too large. The label paper is excessively squeezed, causing deformation and damage, and overloading the rollers and other components, accelerating wear and shortening the service life of the equipment.

[0003] Existing traction mechanisms typically employ a fixed, adjustable clamping method. An adjustment device sets the distance between the drive and driven rollers to a specific value to ensure stable transport of labels of a certain thickness, preventing slippage or damage from excessive pressure. However, in actual production, the thickness of the label paper fluctuates due to factors such as raw material batches and production processes. If the label paper thickness changes, the distance between the drive and driven rollers, fixed after adjustment, cannot be readjusted. When the label paper becomes thinner, the clamping force decreases, potentially causing slippage and inaccurate transport, impacting production efficiency and label application accuracy. Conversely, when the label paper becomes thicker, the clamping force increases, easily damaging the label, resulting in material waste and production failures. This weak self-adjustment capability limits the application of traction mechanisms in complex production environments and increases manual adjustment and equipment maintenance costs.

[0004] Therefore, there is an urgent need to propose a traction mechanism and labeling machine to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a traction mechanism and labeling machine to improve the self-adjustment capability of the traction mechanism, make it suitable for label paper of various thicknesses, increase tolerance to label paper thickness fluctuations, reduce labor and maintenance costs, and improve production stability and quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A traction mechanism includes a mounting frame, a drive roller, a first driven roller, and a second driven roller. The drive roller, the first driven roller, and the second driven roller are rotatably connected to the mounting frame, and are arranged sequentially along the movement path of a label to be traction. The drive roller includes a drive shaft and a drive roller fixedly sleeved on the drive shaft. Both the first driven roller and the second driven roller include a driven shaft and a driven roller rotatably sleeved on the driven shaft. The driven shaft is an eccentric shaft. The traction mechanism also includes an adjustment assembly, which includes an adjustment member, an elastic member, and a connecting member. The first end of the connecting member is fixedly connected to the driven shaft. The adjustment member is adjustablely positioned on the mounting frame. One end of the elastic member is connected to the adjustment member, and the other end is connected to the second end of the connecting member. When the position of the adjustment member changes, the elastic member can drive the connecting member to apply torque to the driven shaft, causing the driven shaft to rotate towards the drive shaft.

[0008] Furthermore, the adjusting member is threadedly connected to the mounting bracket.

[0009] Furthermore, the adjustment assembly also includes a fixing member, which protrudes from the surface of the mounting bracket, and the adjustment member is threadedly connected to the fixing member in a direction parallel to the mounting bracket.

[0010] Furthermore, the adjusting component includes an adjusting bolt and an adjusting nut, and the fixing component has a fixing hole, through which the adjusting bolt passes and is threadedly connected to the adjusting nut.

[0011] Furthermore, both ends of the elastic element are configured as hooks, the end of the adjusting element connected to the elastic element is provided with a first mounting hole, the connecting element is provided with a second mounting hole, and the hook can be hooked into the first mounting hole or the second mounting hole.

[0012] Furthermore, the elastic element is a tension spring; and / or,

[0013] The adjusting component includes a hinge bolt or a lug bolt.

[0014] Furthermore, the connecting member is perpendicular to the axial direction of the driven shaft, the moving direction of the adjusting member is perpendicular to the axial direction of the driven shaft, and the moving direction of the adjusting member is coplanar with but not collinear with the connecting member.

[0015] Furthermore, the first end of the connector connected to the driven shaft is provided with a fixing sleeve, which is sleeved on the driven shaft and keyed to the driven shaft.

[0016] Furthermore, the driving roller is a knurled roller; and / or,

[0017] The driven roller is a rubber-coated roller.

[0018] A labeling machine includes an unwinding mechanism, a rewinding mechanism, and a traction mechanism as described in any of the preceding claims, wherein the unwinding mechanism is used to feed the label paper to the traction mechanism, and the rewinding mechanism is used to retrieve the label paper output by the traction mechanism.

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a traction mechanism and labeling machine, including a mounting frame, a drive roller, a first driven roller, and a second driven roller. The drive roller, the first driven roller, and the second driven roller are rotatably connected to the mounting frame, and are arranged sequentially along the movement path of the label paper to be traction. The drive roller includes a drive shaft and a drive roller fixedly sleeved on the drive shaft. Both the first and second driven rollers include a driven shaft and a driven roller rotatably sleeved on the driven shaft. The drive shaft is used for transmission connection with the output end of a driving component, which can drive the drive shaft to rotate. The drive roller is fixedly connected to the drive shaft, and the label paper is clamped in the drive roller. Between the driven and driven rollers, when the driving roller rotates, due to the friction between the label paper and the driving and driven rollers, the driving and driven rollers rotate simultaneously, thereby pulling the label paper to move. The driven shaft is an eccentric shaft. The traction mechanism also includes an adjustment assembly, which includes an adjustment member, an elastic member, and a connecting member. The first end of the connecting member is fixedly connected to the driven shaft. The position of the adjustment member is adjustable on the mounting bracket. One end of the elastic member is connected to the adjustment member, and the other end is connected to the second end of the connecting member. When the position of the adjustment member changes, the elastic member can drive the connecting member to apply torque to the driven shaft, so that the driven shaft rotates towards the driving shaft. When the label paper thickness is small, adjusting the position of the adjusting element stretches the elastic element, increasing its tension and causing the connecting element to rotate. The connecting element applies torque to the driven shaft, causing it to rotate closer to the drive shaft. This reduces the distance between the driven and drive rollers until it matches the label paper thickness. When the label paper thickness to be pulled is large, adjusting the position of the adjusting element in the opposite direction reduces the tension of the elastic element, causing the label paper to compress and automatically rotate the driven roller away from the drive shaft. When the label paper thickness fluctuates during the pulling process, the elastic element... The elastic component can adaptively adjust the distance between the driving roller and the driven roller through its own elastic deformation, providing a certain tolerance for the clamping force of the traction mechanism. This ensures that the clamping force and friction of the driving roller and the driven roller on the label paper always meet production requirements. It can prevent the label paper from slipping due to insufficient clamping force, and it can also prevent the label paper from being crushed due to excessive clamping force. This improves the self-adjusting capability of the traction mechanism, makes it suitable for label paper of various thicknesses, and increases the tolerance for label paper thickness fluctuations. It also reduces labor and maintenance costs and helps to improve production stability and quality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the traction mechanism provided by this utility model;

[0022] Figure 2 This is a side view of the traction mechanism provided by this utility model;

[0023] Figure 3 yes Figure 2 Sectional view at point AA;

[0024] Figure 4 yes Figure 2 Sectional view at point BB.

[0025] In the picture:

[0026] 1. Mounting bracket; 2. Drive roller; 21. Drive shaft; 22. Drive drum; 3. First driven roller; 31. Driven shaft; 32. Driven drum; 4. Second driven roller; 5. Adjustment assembly; 51. Adjusting component; 511. Adjusting bolt; 512. Adjusting nut; 513. First mounting hole; 52. Elastic component; 53. Connecting component; 531. Second mounting hole; 532. Fixing sleeve; 54. Fixing component; 55. First fixing key; 6. Retaining ring; 7. Bearing; 8. Positioning sleeve; 9. Second fixing key. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] like Figures 1-4 As shown, this embodiment provides a traction mechanism, including a mounting frame 1, a drive roller 2, a first driven roller 3, and a second driven roller 4. The drive roller 2, the first driven roller 3, and the second driven roller 4 are rotatably connected to the mounting frame 1, and the first driven roller 3, the drive roller 2, and the second driven roller 4 are arranged sequentially along the movement path of the label paper to be traction. The drive roller 2 includes a drive shaft 21 and a drive roller 22 fixedly sleeved on the drive shaft 21. The first driven roller 3 and the second driven roller 4 each include a driven shaft 31 and a driven roller 32 rotatably sleeved on the driven shaft 31. The drive shaft 21 is used for transmission connection with the output end of the drive member. The drive member can drive the drive shaft 21 to rotate. The drive roller 22 is fixedly connected to the drive shaft 21. The label paper is sandwiched between the drive roller 22 and the driven roller 32. When the drive roller 22 rotates, due to the friction between the label paper and the drive roller 22 and the driven roller 32, the drive roller 22 and the driven roller 32 rotate simultaneously, thereby traction of the label paper.

[0032] In actual production, when the label paper model changes, the distance between the driving roller 22 and the driven roller 32 needs to be readjusted to adapt to the thickness of the label paper. Furthermore, even label papers of the same model can experience thickness fluctuations due to factors such as raw material batches or production processes, affecting labeling quality. To address these issues, in this embodiment, the driven shaft 31 is an eccentric shaft, and the traction mechanism also includes an adjustment component 5. The adjustment component 5 includes an adjustment member 51, an elastic member 52, and a connecting member 53. The first end of the connecting member 53 is fixedly connected to the driven shaft 31. The adjustment member 51 is adjustablely mounted on the mounting frame 1. One end of the elastic member 52 is connected to the adjustment member 51, and the other end is connected to the second end of the connecting member 53. When the position of the adjustment member 51 changes, the elastic member 52 can drive the connecting member 53 to apply torque to the driven shaft 31, causing the driven shaft 31 to rotate closer to the driving shaft 21.

[0033] When the thickness of the label paper to be pulled is small, adjusting the position of the adjusting element 51 stretches the elastic element 52, increasing its tension and causing the connecting element 53 to rotate. The connecting element 53 applies torque to the driven shaft 31, causing it to rotate closer to the driving shaft 21. This reduces the distance between the driven roller 32 and the driving roller 22 until it matches the thickness of the label paper, ensuring that the clamping force and friction between the driving roller 2 and the driven roller meet production requirements. Conversely, when the thickness of the label paper to be pulled is large, adjusting the position of the adjusting element 51 in the opposite direction reduces the stretching length of the elastic element 52, decreasing its tension. Since the driven shaft 31 is not circumferentially fixed, under the squeezing action of the label paper on the driven roller 32, the driven shaft 31 can automatically rotate away from the driving shaft 21 so that the clamping force and friction of the driving roller 2 and the driven roller on the label paper meet the production requirements. Of course, the operator can also manually operate the connecting piece 53 to adjust the rotation angle of the driven shaft 31. When the thickness of the label paper fluctuates during the traction process, the elastic piece 52 can adaptively adjust the distance between the driving roller 2 and the driven roller through its own elastic deformation, providing a certain tolerance for the clamping force of the traction mechanism. This can prevent the label paper from slipping due to insufficient clamping force, and also prevent the label paper from being crushed due to excessive clamping force. In this embodiment, the displacement of the label paper is always controlled by the active roller 2, which improves the labeling accuracy. The tension of the elastic element 52 can be flexibly adjusted, which improves the self-adjustment capability of the clamping force. It can be applied to label paper of various thicknesses and improves the tolerance to label paper thickness fluctuations. This allows the traction mechanism to be applied to various labeling occasions, reduces labor and maintenance costs, and helps to improve production stability and quality.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, the adjusting member 51 is threadedly connected to the mounting frame 1. By rotating the adjusting member 51, the distance between the first driven roller 3 or the second driven roller 4 and the driving roller 2 can be easily and infinitely adjusted, thereby precisely adjusting the clamping force according to slight changes in the thickness of the label paper. Optionally, the connection method between the adjusting member 51 and the mounting frame 1 includes, but is not limited to, sliding connection and / or snap-fit ​​connection, etc., which are not limited here.

[0035] Furthermore, the adjustment assembly 5 also includes a fixing member 54, which protrudes from the surface of the mounting bracket 1. The adjusting member 51 is threaded to the fixing member 54 in a direction parallel to the mounting bracket 1, which facilitates the stable installation of the adjusting member 51 and avoids movement interference between the adjusting member 51, the mounting bracket 1 and the elastic member 52, making it convenient for the operator to turn the adjusting member 51.

[0036] The fastener 54 is threadedly connected to the mounting bracket 1, which facilitates the assembly and disassembly of the traction mechanism.

[0037] Specifically, the adjusting component 51 includes an adjusting bolt 511 and an adjusting nut 512. The fixing component 54 has a fixing hole. The adjusting bolt 511 passes through the fixing hole and is threadedly connected to the adjusting nut 512. Compared with the adjusting bolt 511 being directly threaded to the fixing component 54, the adjusting nut 512 can lock the position of the adjusting bolt 511, improve the stability of the connection, and help prevent the adjusting bolt 511 from loosening. Moreover, the position of the adjusting bolt 511 can be adjusted by turning the adjusting nut 512, which is more convenient to operate.

[0038] Both ends of the elastic element 52 are configured as hooks. The end of the adjusting element 51 connected to the elastic element 52 is provided with a first mounting hole 513, and the connecting element 53 is provided with a second mounting hole 531. The hooks can be hooked into the first mounting hole 513 or the second mounting hole 531. The hooking method can improve the ease of assembly of the adjusting component 5, and when the elasticity of the elastic element 52 decreases, the elastic element 52 can be easily replaced.

[0039] The connector 53 has at least two second mounting holes 531 spaced apart along its length. Depending on the thickness of the label paper and the structural distribution of the traction mechanism, the hook can be selectively attached to one of the second mounting holes 531 to adjust the elastic force of the elastic element 52, thereby further improving the versatility of the traction mechanism and making it suitable for various labeling occasions.

[0040] Specifically, the elastic element 52 is a tension spring with hooks at both ends. It is a general-purpose part that is inexpensive and readily available. Optionally, the elastic element 52 may include, but is not limited to, rubber bands or rubber posts with hooks at both ends, etc., and is not limited here.

[0041] Furthermore, the adjusting component 51 includes a hinge bolt or an eye bolt, the end of which is provided with a hanging ring, which corresponds to the first mounting hole 513. The hinge bolt or eye bolt is a general-purpose part, which is inexpensive and readily available.

[0042] In this embodiment, the connecting member 53 is perpendicular to the axial direction of the driven shaft 31, the moving direction of the adjusting member 51 is perpendicular to the axial direction of the driven shaft 31, and the moving direction of the adjusting member 51 is coplanar with the connecting member 53 but not collinear, so as to improve the force transmission efficiency between the adjusting member 51, the connecting member 53 and the driven shaft 31, reduce unnecessary friction and energy loss, and facilitate the adjustment of clamping force.

[0043] The first end of the connector 53 connected to the driven shaft 31 is provided with a fixing sleeve 532. The fixing sleeve 532 is sleeved on the driven shaft 31 and keyed to the driven shaft 31 to achieve circumferential fixation of the connector 53 and the driven shaft 31 and to transmit torque. It has a simple structure, high connection stability, can withstand large loads and is easy to disassemble and assemble.

[0044] like Figure 3 As shown, specifically, a fixed groove is provided at one end of the driven shaft 31, and the adjusting assembly 5 also includes a first fixed key 55. A sliding groove extending along its axial direction is provided on the inner wall of the fixed sleeve 532. The lower end of the first fixed key 55 can be inserted into the fixed groove, and the sliding groove can slide into the upper end of the first fixed key 55, so as to realize the circumferential fixation of the connecting piece 53 and the driven shaft 31.

[0045] Furthermore, the traction mechanism also includes a retaining ring 6, also known as a snap ring, which is an elastic open annular retaining ring 6. The driven roller has an annular groove and a step that are machined opposite to each other. The retaining ring 6 can engage with the annular groove. When the fixed sleeve 532 is installed on the driven shaft 31, both ends of the fixed sleeve 532 abut against the step and the retaining ring 6, respectively. During installation, the connecting piece 53 and the driven shaft 31 are first circumferentially fixed by the first fixing key 55, and one end of the fixed sleeve 532 abuts against the step; then the opening of the retaining ring 6 is opened so that it is engaged with the annular groove. At this time, the retaining ring 6 abuts against the other end of the fixed sleeve 532, so that the fixed sleeve 532 is clamped between the retaining ring 6 and the step, thereby achieving axial fixation between the connecting piece 53 and the driven shaft 31.

[0046] In this embodiment, the active roller 22 is a knurled roller to increase the friction between the active roller 2 and the label paper and avoid slippage.

[0047] Furthermore, the driven roller 32 is a rubber-coated roller, which can smooth out uneven parts of the label paper, ensure the flatness of the label paper output by the traction mechanism, and improve the labeling quality.

[0048] By combining knurled rollers and coated rollers, the label paper can be moved smoothly, improving the labeling effect and thus enhancing product quality.

[0049] like Figure 3 and Figure 4 As shown, the driving roller 2, the first driven roller 3, and the second driven roller 4 are rotatably connected to the mounting frame 1 via bearings 7; the driven roller 32 is rotatably connected to the driven shaft 31 via bearings 7; the driving roller 22 and the driving shaft 21 are connected by the second fixing key 9 to achieve circumferential fixation, and the driving roller 22 is provided with positioning sleeves 8 at both ends, which abut against the inner ring of the bearing 7 and the driving roller 22 to achieve axial fixation of the driving roller 22; wherein, each bearing 7 is axially fixed by the driven shaft 31 or the step and retaining ring 6 on the driving shaft 21, and the specific fixing method is the prior art, which will not be described in detail here.

[0050] Furthermore, this embodiment also provides a labeling machine, including an unwinding mechanism, a rewinding mechanism, and a traction mechanism as described in any of the above embodiments. The unwinding mechanism is used to feed label paper to the traction mechanism, and the rewinding mechanism is used to recycle the label paper output by the traction mechanism. By applying the traction mechanism of this embodiment, the self-adjusting capability of the traction mechanism can be improved, making it suitable for label paper of various thicknesses, increasing tolerance to label paper thickness fluctuations, reducing labor and maintenance costs, and improving production stability and quality.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A traction mechanism, comprising a mounting frame (1), a drive roller (2), a first driven roller (3), and a second driven roller (4), wherein the drive roller (2), the first driven roller (3), and the second driven roller (4) are rotatably connected to the mounting frame (1), and the first driven roller (3), the drive roller (2), and the second driven roller (4) are sequentially arranged along the moving path of the label paper to be traction, wherein the drive roller (2) comprises a drive shaft (21) and a drive roller (22) fixedly sleeved on the drive shaft (21), and both the first driven roller (3) and the second driven roller (4) comprise a driven shaft (31) and a driven roller (32) rotatably sleeved on the driven shaft (31), characterized in that, The driven shaft (31) is an eccentric shaft. The traction mechanism also includes an adjustment component (5). The adjustment component (5) includes an adjustment member (51), an elastic member (52), and a connecting member (53). The first end of the connecting member (53) is fixedly connected to the driven shaft (31). The position of the adjustment member (51) is adjustable on the mounting bracket (1). One end of the elastic member (52) is connected to the adjustment member (51), and the other end is connected to the second end of the connecting member (53). When the position of the adjustment member (51) changes, the elastic member (52) can drive the connecting member (53) to apply torque to the driven shaft (31), so that the driven shaft (31) rotates in a direction closer to the driving shaft (21).

2. The traction mechanism according to claim 1, characterized in that, The adjusting member (51) is threadedly connected to the mounting bracket (1).

3. The traction mechanism according to claim 2, characterized in that, The adjustment assembly (5) further includes a fixing member (54), which protrudes from the surface of the mounting bracket (1), and the adjustment member (51) is threaded to the fixing member (54) in a direction parallel to the mounting bracket (1).

4. The traction mechanism according to claim 3, characterized in that, The adjusting component (51) includes an adjusting bolt (511) and an adjusting nut (512). The fixing component (54) has a fixing hole, and the adjusting bolt (511) passes through the fixing hole and is threadedly connected to the adjusting nut (512).

5. The traction mechanism according to claim 1, characterized in that, Both ends of the elastic member (52) are configured as hooks. The end of the adjusting member (51) connected to the elastic member (52) is provided with a first mounting hole (513). The connecting member (53) is provided with a second mounting hole (531). The hook can be hooked into the first mounting hole (513) or the second mounting hole (531).

6. The traction mechanism according to claim 5, characterized in that, The elastic element (52) is a tension spring; and / or, The adjusting element (51) includes a hinge bolt or a lug bolt.

7. The traction mechanism according to claim 1, characterized in that, The connecting member (53) is perpendicular to the axial direction of the driven shaft (31), the moving direction of the adjusting member (51) is perpendicular to the axial direction of the driven shaft (31), and the moving direction of the adjusting member (51) is coplanar with and not collinear with the connecting member (53).

8. The traction mechanism according to claim 1, characterized in that, The first end of the connector (53) connected to the driven shaft (31) is provided with a fixing sleeve (532), which is sleeved on the driven shaft (31) and keyed to the driven shaft (31).

9. The traction mechanism according to claim 1, characterized in that, The drive roller (22) is a knurled roller; and / or, The driven roller (32) is a rubber-coated roller.

10. A labeling machine, characterized in that, It includes an unwinding mechanism, a rewinding mechanism, and a traction mechanism as described in any one of claims 1 to 9, wherein the unwinding mechanism is used to feed the label paper to the traction mechanism, and the rewinding mechanism is used to retrieve the label paper output by the traction mechanism.

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