Feeding mechanism

Abstract

The application discloses a feeding mechanism and relates to the technical field of feeding equipment. The feeding mechanism comprises a conveying platform and a pressing plate assembly. The conveying platform is provided with a track. The pressing plate assembly comprises a base, a pressing plate and a driving part. The pressing plate is arranged on the conveying platform and is rotationally connected with the base. The end of the pressing plate away from the connection part with the base is arranged towards the track. The driving part is arranged on one side of the conveying platform. The driving end of the driving part is connected with one end of the pressing plate. The driving end of the driving part can drive the pressing plate to rotate relative to the base, so that a limiting space for limiting tablets is formed between the pressing plate and the track. The driving end of the driving part in the pressing plate assembly is arranged to ascend and descend, so that the pressing plate can be rotationally pressed flat on the material from the end away from the track to the end close to the track, so that the displacement of the material during the track transportation can be avoided.

Description

Technical Field

[0001] This invention relates to the field of feeding equipment technology, and in particular to a feeding mechanism. Background Technology

[0002] With the development of technology, feeding mechanisms are mechanical components in automated production lines or machinery used to move raw materials, workpieces, or products from one location to another (i.e., the processing location or the next process), thereby achieving automatic material supply, reducing manual operation, and improving production efficiency and safety. Feeding mechanisms typically include feeding components, conveying components, and pushing components. The pushing component and the elastic pressure roller component usually work together in automated production lines to ensure stable material transport and precise positioning.

[0003] In related technologies, after the elastic pressure roller assembly and the pusher assembly work together, the rolls of materials such as tablets may warp due to vibration and other factors during the conveying process, affecting the accuracy of subsequent processing. This requires more manual intervention for adjustment, reducing the continuity and production efficiency of the automated production line. Summary of the Invention

[0004] The main objective of this invention is to propose a feeding mechanism that aims to solve the technical problem of material displacement due to vibration and other factors during the conveying process.

[0005] To achieve the above objectives, the present invention provides a feeding mechanism, in one embodiment of which the feeding mechanism includes:

[0006] A conveying platform, wherein the conveying platform is equipped with tracks;

[0007] A pressure plate assembly includes a base, a pressure plate, and a drive unit. The pressure plate is disposed on the conveying platform and rotatably connected to the base. The end of the pressure plate away from the connection with the base is positioned towards the track. The drive unit is disposed on one side of the conveying platform, and the drive end of the drive unit is connected to one end of the pressure plate. The drive end of the drive unit can drive the pressure plate to rotate relative to the base, so that a limiting space for the tablet is formed between the pressure plate and the track.

[0008] In one embodiment, the pressure plate includes a first pressure plate, two mounting seats, and a second pressure plate. Each mounting seat is disposed on the conveying platform and is located on adjacent sides of the base. The first pressure plate is connected to one end of the drive unit, and both ends of the second pressure plate are rotatably connected to one of the mounting seats. The first pressure plate rotates relative to the base so that the second pressure plate and the track form the limiting space for limiting the tablet.

[0009] In one embodiment, the pressure plate assembly further includes a first elastic member, the two ends of which are respectively connected to the mounting base and the second pressure plate.

[0010] In one embodiment, the feeding mechanism further includes a pushing structure and a driving structure. A first opening and a second opening are respectively provided on the upper and lower sides of the track. Part of the structure of the pushing structure is exposed in the first opening, and part of the structure of the driving structure is exposed in the second opening.

[0011] In one embodiment, the pushing structure includes a support base, a sliding base, and rollers. The support base is disposed on the conveying platform and has a slide rail. The sliding base is slidably connected to the slide rail. The sliding base has a through hole, and the rollers are engaged in the through hole. The rollers are exposed in the first opening.

[0012] In one embodiment, the pushing structure further includes a second elastic element, which is connected to the support base and the sliding base respectively.

[0013] In one embodiment, the roller is made of rubber.

[0014] In one embodiment, the drive structure includes a bearing, a drive motor, a synchronous pulley set, and a rotating wheel. The bearing is located below the track and has a second through hole for the synchronous pulley set and the rotating wheel to be fitted together. The synchronous pulley set includes a first synchronous pulley and a second synchronous pulley fitted onto a synchronous belt. The first synchronous pulley is fitted onto the drive shaft of the drive motor, and the rotating wheel is fitted onto the shaft of the second synchronous pulley. The rotating wheel is exposed in the second opening.

[0015] In one embodiment, the drive structure further includes a sleeve wheel that is sleeved on the timing belt.

[0016] In one embodiment, the feeding mechanism further includes two pushing structures. The driving structure includes the driving motor, the first synchronous pulley, the second synchronous pulley, and the third synchronous pulley. The driving shaft of the driving motor is sleeved with the first synchronous pulley. The first synchronous pulley is sleeved with the second synchronous pulley and the third synchronous pulley respectively through a synchronous belt. The second synchronous pulley cooperates with one of the pushing structures, and the third synchronous pulley cooperates with the other pushing structure.

[0017] The technical solution of this invention, by setting up a pressure plate assembly, ensures that when the material is fed by the feeding mechanism, the vibration of the track causes the material to tilt. The driving end of the driving part in the pressure plate assembly moves up and down, allowing the pressure plate to rotatably press the material flat from the end furthest from the track to the end closest to the track, thus ensuring that the material does not shift during track transportation. This arrangement effectively prevents the material from tilting due to track vibration, improving the stability of material transportation and increasing overall production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the feeding mechanism provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the pressure plate assembly provided by the present invention;

[0021] Figure 3 A cross-sectional structural diagram of the pressure plate assembly provided by the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the pusher structure and the drive structure provided by the present invention.

[0023] Explanation of icon numbers:

[0024] 1000. Feeding mechanism; 1. Conveying platform; 11. Track; 111. First opening; 112. Second opening; 2. Pressure plate assembly; 21. Base; 22. First pressure plate; 23. Drive unit; 24. Mounting seat; 25. Second pressure plate; 26. First elastic element; 3. Pushing structure; 31. Support seat; 32. Sliding base; 33. Roller; 34. Second elastic element; 4. Drive structure; 41. Drive motor; 42. Rotary wheel; 43. Bearing.

[0025] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0028] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0029] This invention proposes a feeding mechanism 1000.

[0030] Please see Figures 1 to 4 In one embodiment of the present invention, the feeding mechanism includes a conveying platform 1 and a pressure plate assembly 2. The conveying platform 1 is provided with a track 11. The pressure plate assembly 2 includes a base 21, a pressure plate, and a driving part 23. The pressure plate is disposed on the conveying platform 1 and is rotatably connected to the base 21. The end of the pressure plate away from the connection with the base 21 is disposed towards the track. The driving part 23 is disposed on one side of the conveying platform. The driving end of the driving part 23 is connected to one end of the pressure plate. The driving end of the driving part 23 can drive the pressure plate to rotate relative to the base 21 so that a limiting space for the tablet is formed between the pressure plate 21 and the track 11.

[0031] In this embodiment, the feeding mechanism is used to convey materials such as tablets. The conveying platform 1 serves as the base for placing and conveying materials, and the track 11 provides a clear path for material conveying, ensuring that the materials move along a predetermined trajectory. The pressure plate assembly 2 is used to flatten the materials during the conveying process. Accordingly, the first pressure plate 22 and the base each have a hole, connected by a rotating shaft, achieving a rotatable connection through the cooperation of the shaft and the hole. The first pressure plate 22 presses down from the edge of the tablets or other materials. Furthermore, when the material is conveyed to the area of ​​the pressure plate assembly 2 on the track 11, the driving end of the drive unit 23 moves up and down, causing the connection between the first pressure plate 22 and the drive unit 23 to rotate relative to the base, so that the first pressure plate 22 flattens the material on the track 11.

[0032] The technical solution of this invention, by setting up a pressure plate assembly 2, ensures that when the material is fed by the feeding mechanism, the vibration of the track 11 causes the material to tilt. The driving end of the driving part 23 in the pressure plate assembly 2 moves up and down, allowing the pressure plate to rotatably press the material flat from the end away from the track 11 to the end closer to the track 11, ensuring that the material does not shift during transport on the track 11. This arrangement effectively prevents the material from tilting when the track 11 vibrates, improving the stability of material transport and increasing overall production efficiency.

[0033] In one embodiment of the present invention, the pressure plate includes a first pressure plate 22, two mounting seats 24 and a second pressure plate 25. Each mounting seat 24 is disposed on the conveying platform 1 and is located on adjacent sides of the base 21. The first pressure plate 22 is connected to one end of the driving part 23. The two ends of the second pressure plate 25 are rotatably connected to a mounting seat 24 respectively. The first pressure plate 22 rotates relative to the base 21 so that the second pressure plate 25 and the track 11 form a limiting space for limiting the tablet.

[0034] In this embodiment, the mounting base 24 is used to mount the second pressure plate 25, which is used to flatten the material during the conveying process. Accordingly, to increase the flattening area of ​​the material, the second pressure plate 25 is provided to achieve more effective flattening. The second pressure plate 25 is located below the first pressure plate 22. The first pressure plate 22 moves up and down via the driving end of the driving unit 23, causing the connection between the first pressure plate 22 and the base to rotate relative to the base. The first pressure plate 22 rotates and presses down, driving the second pressure plate 25 to press down as well. The connection between the second pressure plate 25 and the mounting base 24 rotates relative to the mounting base 24. It can be understood that when the first pressure plate 22 descends under the action of the driving unit 23, it directly applies pressure to the material. Since the connection between the first pressure plate 22 and the base can rotate, this pressure transmission can be effectively achieved through the rotation mechanism, allowing the downward pressure of the first pressure plate 22 to be transmitted effectively. The downward pressing action of the first pressure plate 22 is transmitted to the second pressure plate 25 through its mechanical connection with the second pressure plate 25, causing the second pressure plate 25 to also press down. This linkage effect ensures that the two pressure plates can work together to apply uniform pressure to the material.

[0035] The above-described configuration, by adding a second pressure plate 25 and utilizing the linkage mechanism of the first pressure plate 22, not only improves the flattening effect and efficiency and increases the pressure on the material, making it more effective for flattening, but also enhances the adaptability and automation level of the equipment. Simultaneously, it improves the flatness of the material and reduces excessive local pressure on the material, thereby lowering the risk of damage during the flattening process.

[0036] In one embodiment of the present invention, the pressure plate assembly 2 further includes a first elastic member 26, the two ends of which are connected to the mounting base 24 and the second pressure plate 25, respectively.

[0037] In this embodiment, to avoid damage to the material due to excessive downward pressure, a first elastic element 26 is provided to provide a buffering effect during material conveying. Accordingly, the first elastic element 26 is preferably in the form of a spring. Further, the two ends of the spring are respectively fixed to the surface of the mounting base 24 and the surface of the second pressure plate 25 facing the mounting base 24 by welding. When the second pressure plate 25 is not subjected to the pressure of the first pressure plate 22, the spring is in its initial state; when the second pressure plate 25 is subjected to the pressure generated by the first pressure plate 22, due to the presence of the spring, the impact of the second pressure plate 25 on the material can be reduced when the second pressure plate 25 is pressed down, thereby protecting the material. This arrangement provides a certain buffering effect when the second pressure plate 25 applies pressure, reducing the impact on the material, and also absorbing the vibration generated by the pressure plate during the flattening process.

[0038] In one embodiment of the present invention, the feeding mechanism further includes a pushing structure 3 and a driving structure 4. A first opening 111 and a second opening 112 are respectively opened on the upper and lower sides of the track 11. Part of the structure of the pushing structure 3 is exposed in the first opening 111, and part of the structure of the driving structure 4 is exposed in the second opening 112.

[0039] In this embodiment, the pushing structure 3 is used to convey materials such as tablets, and the driving structure 4 is used to provide a power source for the pushing structure 3. The first opening 111 and the second opening 112 cooperate to push the material forward, ensuring that the material can be effectively pushed and conveyed. The pushing structure 3 contacts the material through the first opening 111, while the driving structure 4 provides the necessary power through the second opening 112. It is understood that, in order to further avoid damage to the material during the pushing process, the pushing structure 3 is made of rubber. Correspondingly, the pushing structure 3 and the driving structure 4 push the material through rollers 33. The material is pushed and conveyed by the friction between the contact surface between the rollers 33 and the material. The rollers 33 in the pushing structure 3 and the rollers 33 in the driving structure 4 rotate in opposite directions, pushing the material forward. The material of the rollers 33 is made of wear-resistant materials, etc., which is not limited here. The above arrangement effectively feeds the tablets into the track 11, improving the efficiency and stability of the feeding process.

[0040] In one embodiment of the present invention, the pushing structure 3 includes a support base 31, a sliding base 32 and a roller 33. The support base 31 is disposed on the conveying platform 1 and is provided with a slide rail. The sliding base 32 is slidably connected to the slide rail. The sliding base 32 has a through hole, and the roller 33 is engaged in the through hole. The roller 33 is exposed in the first opening 111.

[0041] In this embodiment, the support base 31 provides a stable installation foundation, ensuring the stability and reliability of the structure during operation. Correspondingly, the support base 31 can be connected to the conveying platform 1 via snap-fit, plug-in, or other methods. The sliding base 32 enables sliding motion. A slide rail is provided on the side of the support base 31 facing the sliding base 32, and the sliding base 32 is slidably connected to the slide rail. Further, a through hole is provided at the end of the sliding base 32 near the first opening 111, and a rotating shaft is installed in the through hole. A roller 33 is sleeved on the rotating shaft, and the roller 33 is exposed in the first opening 111. Correspondingly, the roller 33 is an elastic pressure roller, made of materials including but not limited to rubber. It is understood that since the feeding mechanism may push materials of different sizes, to accommodate tablets of different thicknesses, the position of the sliding base 32 on the slide rail can be adjusted so that the roller 33 can precisely contact the material and cooperate with the rotating wheel 42 of the drive structure 4 to push the material forward. The above setup can adapt to different tablet sizes and shapes, providing stable support and positioning, and improving the adaptability of feeding.

[0042] In one embodiment of the present invention, the pusher structure 3 further includes a second elastic element 34, which is connected to the support base 31 and the sliding base 32 respectively.

[0043] In this embodiment, to further ensure the smooth operation of the pushing structure 3 during the conveying process, the support base 31 and the sliding base 32 are elastically connected. Correspondingly, the second elastic element 34 can be connected to the support base 31 and the sliding base 32 respectively by means of bonding, bolting, etc. The support base 31 and the sliding base 32 can have pre-set slots, and the second elastic element 34 connects to these slots at both ends, providing elastic support and buffering. The second elastic element 34 can also be designed as an embedded structure, directly embedded in the groove or fixing hole in the support base 31 or the sliding base 32. This is not limited here and can be customized according to requirements. Preferably, the second elastic element 34 can be a spring. The above-described arrangement, through the elastic connection between the support base 31 and the sliding base 32, can absorb a certain amount of impact and vibration, alleviate external pressure changes, protect the transmission system from damage, and improve durability and service life.

[0044] In one embodiment of the present invention, the roller 33 is made of rubber.

[0045] In this embodiment, the rubber has good elasticity and softness, which can reduce damage to the tablet when it comes into contact with the tablet, and avoid tablet breakage or deformation that may be caused by hard materials; the rubber roller 33 can absorb some vibration and noise when it comes into contact with the tablet, making the entire feeding process more stable and quiet.

[0046] In one embodiment of the present invention, the drive structure 4 includes a bearing 43, a drive motor 41, a synchronous pulley set, and a rotating wheel 42. The bearing 43 is located below the track 11. The bearing 43 has a second through hole for the synchronous pulley set and the rotating wheel 42 to be fitted together. The synchronous pulley set includes a first synchronous pulley and a second synchronous pulley fitted together with the synchronous belt. The first synchronous pulley is fitted together with the drive shaft of the drive motor 41. The rotating wheel 42 is fitted together with the shaft of the second synchronous pulley. The rotating wheel 42 is exposed in the second opening 112.

[0047] In this embodiment, bearing 43 supports and fixes the rotating wheel 42, drive motor 41 provides the power source, and the synchronous pulley set ensures precise synchronization between the rotation of drive motor 41 and the rotation of rotating wheel 42 through the synchronous gear transmission principle. Accordingly, drive motor 41 drives the first synchronous pulley to rotate via drive shaft. The first synchronous pulley drives the second synchronous pulley to rotate via synchronous belt transmission. The second synchronous pulley drives the rotating wheel 42 to rotate via its shaft, thereby achieving motion transmission. Rotating wheel 42 is connected to the shaft of the second synchronous pulley and exposed through the second opening 112, enabling direct material conveying on track 11. This configuration, through precise synchronous transmission, bearing 43 support, and a reasonable structural layout, achieves efficient, stable, and reliable power transmission. Drive motor 41 connects to the synchronous belt via the first synchronous pulley, driving the second synchronous pulley to rotate, thereby driving rotating wheel 42 to rotate, making power transmission more efficient and reducing energy loss. The synchronous pulley set, through synchronous belt transmission, ensures precise synchronization between drive motor 41 and rotating wheel 42, avoiding errors in traditional mechanical transmission and guaranteeing motion consistency.

[0048] In one embodiment of the present invention, the drive structure 4 further includes a sleeve wheel, which is sleeved on the timing belt.

[0049] In this embodiment, the pulley is typically a component whose tooth profile matches that of the timing belt. Its function is to transmit power through the meshing of gears with the timing belt. Accordingly, the pulley directly meshes with the timing belt through its gear portion. The tooth grooves of the timing belt and the gears of the pulley perfectly match, enabling stable power transmission during operation. This arrangement, by matching the tooth profile of the pulley with that of the timing belt, ensures zero slippage during transmission, guaranteeing efficient and stable power transmission. The gear meshing of the pulley on the timing belt ensures precise power transmission, avoiding transmission errors or slippage, thereby improving the system's transmission efficiency and accuracy.

[0050] In one embodiment of the present invention, the feeding mechanism further includes two pushing structures 3, and the driving structure 4 includes a driving motor 41, a first synchronous wheel, a second synchronous wheel and a third synchronous wheel. The driving shaft of the driving motor 41 is sleeved with the first synchronous wheel. The first synchronous wheel is sleeved with the second synchronous wheel and the third synchronous wheel respectively through a synchronous belt. The second synchronous wheel cooperates with one of the pushing structures 3, and the third synchronous wheel cooperates with the other pushing structure 3.

[0051] In this embodiment, to further achieve efficient power transmission, two pushing structures 3 are configured to transmit power through a single driving structure 4. The first synchronous pulley, serving as the output of the drive motor 41, transmits power to the second and third synchronous pulleys via a synchronous belt. The second synchronous pulley transmits power to one pushing structure 3 via the synchronous belt, thereby driving the pushing motion. The third synchronous pulley transmits power to another pushing structure 3 via the synchronous belt, driving the other pushing mechanism to move. This multi-pulley, multi-belt configuration ensures the simultaneous driving of the two pushing structures 3, thus guaranteeing synchronicity and stability during the feeding process to a certain extent. Furthermore, when the drive motor 41 starts, the motor transmits power through the synchronous pulley set and the synchronous belt, driving the pushing structure 3 to push the material in a predetermined direction. The above configuration, through the efficient cooperation of the synchronous belt and synchronous pulleys, reduces energy loss and improves the system's working efficiency. Simultaneously, since the synchronous belt drive does not produce slippage, it ensures the motion accuracy of the two pushing structures 3, avoiding uneven or misaligned pushing caused by asynchronous power transmission.

[0052] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A feeding mechanism, characterized in that, The feeding mechanism includes: A conveying platform (1) is provided with a track (11); The pressure plate assembly (2) includes a base (21), a pressure plate, and a drive unit (23). The pressure plate is disposed on the conveying platform (1) and is rotatably connected to the base (21). The end of the pressure plate away from the connection with the base (21) is disposed towards the track. The drive unit (23) is disposed on one side of the conveying platform (1). The drive end of the drive unit (23) is connected to one end of the pressure plate. The drive end of the drive unit (23) can drive the pressure plate to rotate relative to the base (21) so that a limiting space for the tablet is formed between the pressure plate and the track (11). The pressure plate includes a first pressure plate (22), two mounting seats (24) and a second pressure plate (25). Each mounting seat (24) is disposed on the conveying platform (1) and is located on adjacent sides of the base (21). The first pressure plate (22) is connected to one end of the drive unit (23). The two ends of the second pressure plate (25) are rotatably connected to one of the mounting seats (24). The first pressure plate (22) rotates relative to the base (21) so that the second pressure plate (25) and the track (11) form the limiting space for limiting the tablet. The pressure plate assembly (2) further includes a first elastic element (26), the two ends of which are connected to the mounting base (24) and the second pressure plate (25), respectively. The feeding mechanism also includes a pushing structure (3) and a driving structure (4). The upper and lower sides of the track (11) are respectively provided with a first opening (111) and a second opening (112). Part of the structure of the pushing structure (3) is exposed in the first opening (111), and part of the structure of the driving structure is exposed in the second opening (112).

2. The feeding mechanism as described in claim 1, characterized in that, The feeding structure (3) includes a support base (31), a sliding base (32), and a roller (33). The support base is located on the conveying platform. The support base (31) is provided with a slide rail. The sliding base (32) is slidably connected to the slide rail. The sliding base (32) has a through hole. The roller (33) is engaged in the through hole. The roller (33) is exposed in the first opening (111).

3. The feeding mechanism as described in claim 2, characterized in that, The pusher structure (3) further includes a second elastic element (34), which is connected to the support base (31) and the sliding base (32) respectively.

4. The feeding mechanism as described in claim 3, characterized in that, The roller (33) is made of rubber.

5. The feeding mechanism as described in claim 2, characterized in that, The drive structure (4) includes a bearing (43), a drive motor (41), a synchronous pulley set, and a rotating wheel (42). The bearing (43) is located below the track (11). The bearing (43) has a second through hole for the synchronous pulley set and the rotating wheel (42) to be fitted together. The synchronous pulley set includes a first synchronous pulley and a second synchronous pulley fitted together with a synchronous belt. The first synchronous pulley is fitted together with the drive shaft of the drive motor (41). The rotating wheel (42) is fitted together with the shaft of the second synchronous pulley. The rotating wheel (42) is exposed in the second opening (112).

6. The feeding mechanism as described in claim 5, characterized in that, The drive structure (4) also includes a sleeve wheel, which is sleeved on the timing belt.

7. The feeding mechanism as described in claim 5, characterized in that, The feeding mechanism further includes two pushing structures (3). The driving structure (4) includes the driving motor (41), the first synchronous wheel, the second synchronous wheel and the third synchronous wheel. The driving shaft of the driving motor (41) is sleeved with the first synchronous wheel. The first synchronous wheel is sleeved with the second synchronous wheel and the third synchronous wheel respectively through a synchronous belt. The second synchronous wheel cooperates with one of the pushing structures (3), and the third synchronous wheel cooperates with the other pushing structure (3).

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