A can opener

Abstract

The present invention relates to a can opener. In this can opener, a roller is rotatably constrained on a moving seat, which is arranged outside the installation cavity and beside the cutter wheel. There is a gap between the roller and the cutter wheel to form a cutting opening for inserting the upper edge of the can mouth. Since the guide groove is at least partially arranged at an angle to the vertical direction, such that one of the two side walls thereof is located on the path of the up-and-down movement of the contact part of the adjusting member, the up-and-down movement of the adjusting member can act on the moving seat in a reaction manner and force the moving seat to move horizontally, thereby realizing the adjustment of the cutting opening. Compared with the existing adjustment forms, the form of using the vertical movement of the adjusting member can not only avoid generating a lateral force on a single contact point, so that the strength requirement for parts can be greatly reduced, but also since the adjusting member contacts the guide groove inside the moving seat, the interaction force generated between the two can be well offset by the moving seat, improving the structural stability of the entire mechanism.

Description

Technical Field

[0001] The present invention relates to the field of switching tools, and more particularly to a can opener. Background Art

[0002] Canned food is a kind of prefabricated food that is easy to preserve. People usually use a special can opener to quickly open cans. Traditional manual can openers are more common, but in order to make the can opening process more labor-saving, manual can openers have gradually been replaced by electric can openers. For an electric can opener, the edge of the can body needs to be placed in the cutting gap between the cutter heads before cutting, and then smoothly withdrawn from the above-mentioned cutting gap after cutting. Therefore, in addition to setting a main drive mechanism to rotate the cutter heads in the existing can opener, a cutter head spacing adjustment device is also provided. By adjusting the size of the cutting gap between the two cutter heads, the cutter heads can closely adhere to the can mouth when the can opener performs the cutting action, and the edge of the can mouth can be smoothly inserted and removed after the cutting action ends.

[0003] For example, the Chinese invention patent with the patent number CN202210449209.0 discloses "A DC Automatic Rotary Edge Cutting Can Opener". In this can opener, the core component inside is a spiral sliding block, which moves up and down through the top spiral surface. Since the outer diameter of its bottom has a gradient change, it can act on the sliding plate to move horizontally, driving the roller to move relative to the cutter wheel, thereby changing the cutting gap.

[0004] Although the above can opener can adjust the distance between its roller and cutter wheel, it still has certain defects:

[0005] 1. The spiral sliding block deflects by abutting against the transmission pin on the transmission shaft. This transmission pin is a component that is laterally stressed. In order to prevent it from bending, it has relatively high requirements for its strength.

[0006] 2. The spring abuts against the sliding plate from the side and applies force. The direction of its acting force is prone to deviation, and the sliding plate does not have an additional guiding mechanism to ensure that its left and right movement does not deviate. Therefore, it is necessary to have relatively high requirements for its dimensional accuracy.

[0007] After the can opener is used for a long time, it is very easy to cause the adjustment gap to become larger due to the above two problems, which will cause the phenomenon of incomplete can opening and increase the failure rate of can opening. Summary of the Invention

[0008] The first technical problem to be solved by the present invention is to provide a can opener that uses an adjusting member and a guiding groove to cooperate to adjust the cutting opening according to the current situation of the prior art.

[0009] The second technical problem to be solved by the present invention is to provide a can opener in which the up-and-down movement of the adjusting member is linearly smooth in view of the current situation of the prior art.

[0010] The technical solution adopted by the present invention to solve the above first technical problem is: a can opener, comprising:

[0011] A housing, which is hollow inside to form an installation cavity;

[0012] A cutter wheel, which is arranged outside the installation cavity and is arranged to be rotatable relative to the housing;

[0013] A driving mechanism, which is arranged in the installation cavity, and the power output end thereof is located outside the installation cavity and is drivingly connected to the cutter wheel;

[0014] A moving seat, which is arranged in the installation cavity and is arranged to be horizontally movable relative to the housing;

[0015] A roller, which is rotatably constrained on the moving seat, is arranged outside the installation cavity and beside the cutter wheel, and a cutting opening for inserting the upper edge of the can mouth is formed by leaving a gap between the roller and the cutter wheel. Moreover, the roller can approach or move away from the cutter wheel under the action of the horizontal movement of the moving seat;

[0016] An adjusting structure, which has an adjusting member and a guiding groove formed on the moving seat. The adjusting member has a contact portion located in the guiding groove and capable of sliding along the guiding groove. Moreover, the adjusting member is arranged to be vertically movable relative to the moving seat. The guiding groove is at least partially arranged at an angle to the vertical direction so that one of the two side walls of the guiding groove itself is located on the path of the up-and-down movement of the contact portion, so that the up-and-down movement of the adjusting member can act on the moving seat in a reverse manner and force the moving seat to move horizontally.

[0017] In order to ensure the constraint on the up-and-down movement of the adjusting member, preferably, a vertically penetrating guiding channel is arranged in the installation cavity, the adjusting member is vertically movably constrained in the guiding channel, and the guiding groove is formed on the inner wall of the guiding channel, and the contact portion is arranged on the outer wall of the adjusting member.

[0018] The adjusting member can be in guiding cooperation with the guiding groove through different structures. Preferably, the adjusting member is in a cylindrical shape and extends vertically, and the contact portion is a guiding column extending radially outward from the outer wall of the adjusting member. The cylindrical design of the adjusting member, on the one hand, utilizes the structural advantages of the cylindrical shape itself to form effective support in the vertical and horizontal directions to avoid uneven force on the guiding column; on the other hand, the vertical extension of the adjusting member just conforms to its own moving direction, thereby further avoiding unnecessary external force on the guiding column.

[0019] There are various structures for implementing the guiding channel. To ensure that when the moving seat moves, it can drive the roller to move so as to facilitate the adjustment of the cutting opening, preferably, the moving seat further includes a bottom plate. A vertically extending rotating shaft is installed at the bottom of one side of the bottom plate, and the roller is rotatably constrained on the rotating shaft; a guiding sleeve is provided on the other side of the bottom plate. The inside of the guiding sleeve is hollow to form a first embedding groove, and at least the lower end of the adjusting member is constrained in the first embedding groove.

[0020] To ensure the constraint on the upper part of the adjusting member, preferably, the driving mechanism includes a driver and an output gear connected to the output end of the driver. An axial sleeve extending downward is provided in the central area of the output gear. The axial sleeve has a second embedding groove with an opening facing downward. The output gear is arranged above the guiding sleeve so that the lower edge of the axial sleeve is connected to the upper edge of the guiding sleeve, thereby enabling the first embedding groove and the second embedding groove to be joined to form a guiding channel.

[0021] Preferably, the guiding groove is formed on the inner wall of the first embedding groove and has a first guiding section and a second guiding section. The first guiding section extends vertically, and the second guiding section is connected to the end of the first guiding section and is arranged obliquely downward along the circumferential direction of the first embedding groove. Such a sectional design of the guiding groove can make the up-and-down movement of the adjusting member more sense of section and gear position. And since the overall trend of the second guiding section is downward along the circumference of the embedding groove, the depth of the second guiding section will change in gradient according to the shape of the inner wall of the first embedding groove. During the up-and-down movement of the adjusting member, the guiding post on it will be at different depths of the second guiding section when it moves to different positions of the second guiding section. When the acting force received is larger, it is at a deeper position of the second guiding section, which can effectively convert the external force into the internal force between the guiding groove and the guiding post, greatly reducing the requirement for the part strength of the adjusting member.

[0022] Furthermore, a reinforcing wall extends locally outward on the outer side of the guiding sleeve corresponding to the guiding groove, and the thickness of the reinforcing wall gradually becomes thicker from the center of the guiding groove to the two side walls. Such a design of the reinforcing wall increases the thickness of the entire guiding sleeve, deepens the depth of the guiding groove, so it can further offset the external force received by the guiding post. And to match the overall trend of the second guiding section along the circumference of the embedding groove downward, the reinforcing wall gradually becomes thicker towards the two side walls. In the trend of the second guiding section, the reinforcing wall can have enough thickness for the second guiding section to be formed, ensuring that the guiding post is entirely accommodated therein.

[0023] Specifically, the first guiding section and the second guiding section are arranged vertically, and the connection between them is in an arc transition. The reinforcing wall extends along the length direction of the guiding sleeve, and the projection of the reinforcing wall on the plane where the guiding groove is located can cover the guiding groove.

[0024] To ensure the cutting of the can mouth, preferably, the driving mechanism further includes a cutter shaft, which is drivingly connected to the output gear, and the lower end thereof extends below the housing, and the cutter wheel is connected to the lower end of the cutter shaft.

[0025] To make the best use of the internal space of the guiding channel and ensure that the adjusting member does not shift during the up-and-down movement, preferably, the cutter shaft is arranged in the guiding channel and the upper end thereof passes through the output gear, the adjusting member is sleeved on the cutter shaft and can slide along the cutter shaft, so as to move up and down relative to the moving seat.

[0026] To further solve the above-mentioned second technical problem and ensure the linear and smooth up-and-down movement of the adjusting member, preferably, the inner wall of the bushing is convexly provided with bumps, and the outer wall of the adjusting member is provided with sliding grooves for accommodating the bumps. The sliding grooves are spirally arranged around the outer peripheral wall of the adjusting member from top to bottom, and under the rotation of the output gear, the bumps can reciprocally slide along the sliding grooves to drive the adjusting member to move up and down. In this way, by using the cooperation form of the sliding grooves and the bumps, the rotation of the bushing can be converted into the up-and-down movement of the adjusting member with the help of the threaded sliding grooves. On the one hand, the rigid contact generated during the direct action is avoided, and on the other hand, the whole adjustment process is made more linear and smooth.

[0027] To ensure that after the adjusting member moves in place, the power of the driver can be transmitted to the cutter wheel to perform the cutting action, preferably, the lower end of the adjusting member is provided with a connecting edge, the guiding column is arranged on the connecting edge, and there is a gap between the end of the sliding groove and the connecting edge, so as to form a gear position groove for accommodating the bumps. When the output gear rotates to the state where the bumps are located in the gear position groove, the adjusting member and the guiding sleeve of the moving seat remain relatively stationary.

[0028] To ensure that the up-and-down movement of the adjusting member has a more distinct sense of section, preferably, an elastic member is further arranged on the moving seat, and the elastic member acts on the adjusting member to make the adjusting member always have a tendency to move downward.

[0029] Specifically, the elastic member is a spring sleeved on the cutter shaft, the upper end of the spring abuts against the upper end wall of the bushing, and the lower end abuts against the upper edge of the adjusting member.

[0030] To ensure the generation and transmission of power, preferably, the driving mechanism further includes an input gear and at least one transmission gear arranged between the input gear and the output gear, the output shaft of the driver meshes with the input gear, and the input gear meshes with the output gear through the transmission gear.

[0031] Compared with the prior art, the advantages of the present invention are as follows: In this can opener, since the guiding groove is at least partially arranged at an angle to the vertical direction, such that one of the two side walls of the guiding groove itself is located on the path of the up-and-down movement of the contact portion of the adjusting member, the up-and-down movement of the adjusting member can act on the moving seat in a reaction manner and force the moving seat to move horizontally, thereby realizing the adjustment of the cutting opening. Compared with the existing adjustment forms, the form of using the vertical movement of the adjusting member can not only avoid generating a lateral force on a single contact point, so that the strength requirement for the parts can be greatly reduced, and because the adjusting member contacts the guiding groove inside the moving seat, the interaction force generated between the two can be well offset by the moving seat, improving the structural stability of the entire mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of the can opener in an embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view of the overall structure of the can opener (the cutter wheel cuts the can mouth);

[0034] Figure 3 is a cross-sectional view of the overall structure of the can opener (the cutter wheel releases the can mouth);

[0035] Figure 4 is a schematic diagram of the overall structure of the moving seat;

[0036] Figure 5 is a cross-sectional view of the output gear;

[0037] Figure 6 is a schematic diagram of the overall structure of the output gear;

[0038] Figure 7 is a schematic exploded view of the overall structure of the can opener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be further described in detail below with reference to the embodiments of the drawings.

[0040] As Figures 1 to 7 shown, it is a preferred embodiment of the present invention. In this embodiment,

[0041] The can opener includes a housing 1, a cutter wheel 3, a driving mechanism 2, a moving seat 5, a roller 4 and an adjusting structure. The interior of the above-mentioned housing 1 is hollow to form an installation cavity 10, and the housing 1 specifically includes a first housing member 11 and a second housing member 12. In this embodiment, cutting the edge of the can mouth is achieved by the cooperation of the cutter wheel 3 and the roller 4. Among them, the cutter wheel 3 is the driving wheel, which is arranged outside the installation cavity 10 and is arranged to be rotatable relative to the housing 1. The power of the cutter wheel 3 is supplied by the driving mechanism 2, which is arranged in the installation cavity 10 and its power output end is located outside the installation cavity 10 and is drivingly connected to the cutter wheel 3. The above-mentioned roller 4 is a driven wheel. There is a moving seat 5 in the installation cavity 10 that can move horizontally relative to the housing 1. The above-mentioned roller 4 is rotatably constrained on the moving seat 5. It is arranged outside the installation cavity 10 and beside the cutter wheel 3. There is a gap between the roller 4 and the cutter wheel 3 to form a cutting opening 100 for inserting the upper edge of the can mouth.

[0042] In this embodiment, the roller 4 can approach or move away from the cutter wheel 3 under the horizontal movement of the moving seat 5, and this action is achieved by the cooperation of the adjusting structure. The above-mentioned adjusting structure has an adjusting member 51 and a guiding groove 50 opened on the moving seat 5. Among them, the adjusting member 51 has a contact portion located in the guiding groove 50 and capable of sliding along the guiding groove 50. Moreover, the adjusting member 51 is arranged to be movable up and down relative to the moving seat 5. The guiding groove 50 is at least partially arranged at an angle to the vertical direction so that one of its two side walls is located on the path of the up and down movement of the contact portion, so that the up and down movement of the adjusting member 51 can act on the moving seat 5 in reverse and force the moving seat 5 to move horizontally.

[0043] In the installation cavity 10 of this embodiment, there is a vertically penetrating guide channel 530. The adjusting member 51 is constrained to be movable up and down within the guide channel 530, and a guide groove 50 is formed on the inner wall of the guide channel 530. The contact portion is arranged on the outer wall of the adjusting member 51. The adjusting member 51 is cylindrical and extends vertically. The contact portion is a guide post 511 extending radially outward from the outer wall of the adjusting member 51. The guide channel 530 in this embodiment is formed by combining two parts. One part is the guide sleeve 53, that is, the above-mentioned moving seat 5 further includes a bottom plate 52. A vertically extending rotating shaft 521 is installed at the bottom of one side of the bottom plate 52, and the roller 4 is rotatably constrained on the rotating shaft 521; on the other side of the bottom plate 52, there is a guide sleeve 53. The interior of the guide sleeve 53 is hollow to form a first embedding groove 53a, and at least the lower end of the adjusting member 51 is constrained within the first embedding groove 53a. The other part of the guide channel 530 is the shaft sleeve 221, that is, the driving mechanism 2 includes a driver 21 and an output gear 22 connected to the output end of the driver 21. The driving mechanism 2 further includes an input gear 24 and at least one transmission gear 25 arranged between the input gear 24 and the output gear 22. The output shaft of the driver 21 meshes with the input gear 24, and the input gear 24 meshes with the output gear 22 through the transmission gear 25. In the central area of the above-mentioned output gear 22, there is a downwardly extending shaft sleeve 221. The shaft sleeve 221 has a second embedding groove 22a with an opening facing downwards. The output gear 22 is arranged above the guide sleeve 53, so that the lower edge of the shaft sleeve 221 is connected to the upper edge of the guide sleeve 53, thereby enabling the first embedding groove 53a and the second embedding groove 22a to be joined to form the guide channel 530.

[0044] In this embodiment, the guide groove 50 is formed on the inner wall of the first embedding groove 53a, and has a first guiding section 501 and a second guiding section 502. The first guiding section 501 extends vertically, and the second guiding section 502 is joined to the end of the first guiding section 501 and is arranged to slope downwards along the circumferential direction of the first embedding groove 53a. In order to ensure that the guide groove 50 has a certain depth, the above-mentioned guide sleeve 53 extends partially outward on the outer side corresponding to the guide groove 50 to form a reinforcing wall 515, and the thickness of the reinforcing wall 515 gradually becomes thicker from the center of the guide groove 50 towards both side walls. In this embodiment, the first guiding section 501 and the second guiding section 502 are arranged up and down, and the connection between the two is in an arc transition. The reinforcing wall 515 extends along the length direction of the guide sleeve 53, and the projection of the reinforcing wall 515 on the plane where the guide groove 50 is located can cover the guide groove 50.

[0045] The drive mechanism 2 in this embodiment further includes a tool shaft 23. The tool shaft 23 is drivingly connected to the output gear 22, and its lower end extends below the housing 1. The tool wheel 3 is connected to the lower end of the tool shaft 23. The above-mentioned tool shaft 23 is arranged in the guide channel 530 and its upper end passes through the output gear 22. The adjusting member 51 is sleeved on the tool shaft 23 and can slide along the tool shaft 23, so as to move up and down relative to the moving seat 5.

[0046] There are various ways to realize the up and down movement of the adjusting member 51. In this embodiment, convex points 222 are convexly provided on the inner wall of the bushing 221. A sliding groove 512 for accommodating the convex points 222 is provided on the outer wall of the adjusting member 51. The sliding groove 512 is spirally arranged around the outer peripheral wall of the adjusting member 51 from top to bottom. Under the rotation of the output gear 22, the convex points 222 can reciprocally slide along the sliding groove 512 to drive the adjusting member 51 to move up and down. In addition, a connecting edge 513 is provided at the lower end of the adjusting member 51. The guide post 511 is provided on the connecting edge 513, and there is a gap between the end of the sliding groove 512 and the connecting edge 513, thus forming a gear position groove 514 for the convex points 222 to be accommodated therein. When the output gear 22 rotates to the state where the convex points 222 are located in the gear position groove 514, the adjusting member 51 and the guide sleeve 53 of the moving seat 5 remain relatively stationary. An elastic member 6 is further provided on the moving seat 5 in this embodiment. The elastic member 6 acts on the adjusting member 51 so that the adjusting member 51 always has a tendency to move downward. The above elastic member 6 is a spring sleeved on the tool shaft 23. The upper end of the spring abuts against the upper end wall of the bushing 221, and the lower end abuts against the upper edge of the adjusting member 51.

[0047] In addition, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used in the description and claims of the present invention to describe various example structural parts and elements of the present invention. However, these terms are used here only for the convenience of description and are determined based on the example orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity.

Claims

1. A can opener, comprising: A housing (1) with a hollow interior forming an installation cavity (10); A cutter wheel (3) disposed outside the installation cavity (10) and arranged to be rotatable relative to the housing (1); A driving mechanism (2) disposed within the installation cavity (10), and its power output end is located outside the installation cavity (10) and is drivingly connected to the cutter wheel (3); A moving seat (5) disposed within the installation cavity (10) and arranged to be horizontally movable relative to the housing (1); A roller (4) rotatably constrained on the moving seat (5), which is disposed outside the installation cavity (10) and beside the cutter wheel (3). There is a gap between the roller (4) and the cutter wheel (3) to form a cutting opening (100) for inserting the upper edge of the can mouth. Moreover, the roller (4) can approach or move away from the cutter wheel (3) under the action of the horizontal movement of the moving seat (5); It is characterized in that it further includes: An adjusting structure having an adjusting member (51) and a guiding groove (50) opened on the moving seat (5). The adjusting member (51) has a contact portion located within the guiding groove (50) and capable of sliding along the guiding groove (50). And the adjusting member (51) is arranged to be vertically movable relative to the moving seat (5). The guiding groove (50) is at least partially arranged at an angle to the vertical direction so that one of its two side walls is located on the path of the up-and-down movement of the contact portion, thereby enabling the up-and-down movement of the adjusting member (51) to act on the moving seat (5) in a reverse manner and forcing the moving seat (5) to move horizontally; There is a vertically penetrating guiding channel (530) arranged within the installation cavity (10). The adjusting member (51) is vertically movably constrained within the guiding channel (530), and the guiding groove (50) is opened on the inner wall of the guiding channel (530); The moving seat (5) further includes a bottom plate (52). A guiding sleeve (53) is provided on the bottom plate (52), and the interior of the guiding sleeve (53) is hollow to form a first embedding groove (53a); The guiding groove (50) is opened on the inner wall of the first embedding groove (53a) and has a first guiding section (501) and a second guiding section (502). The first guiding section (501) extends vertically, and the second guiding section (502) is connected to the end of the first guiding section (501) and is arranged to slope downward along the circumferential direction of the first embedding groove (53a).

2. The can opener according to claim 1, wherein: The contact portion is provided on the outer wall of the adjusting member (51).

3. The can opener according to claim 2, wherein: The adjusting member (51) is in a cylindrical shape and extends vertically. The contact portion is a guiding post (511) extending radially outward from the outer wall of the adjusting member (51).

4. The can opener according to claim 3, characterized in that: A vertically extending rotating shaft (521) is installed at the bottom of one side of the bottom plate (52). The roller (4) is rotatably constrained on the rotating shaft (521); on the other side of the bottom plate (52), the guiding sleeve (53) is provided, and at least the lower end of the adjusting member (51) is constrained within the first embedding groove (53a).

5. The can opener according to claim 4, characterized in that: The driving mechanism (2) includes a driver (21) and an output gear (22) connected to the output end of the driver (21). A bushing (221) extending downward is provided in the central area of the output gear (22). The bushing (221) has a second groove (22a) with an opening facing downward. The output gear (22) is arranged above the guide sleeve (53) such that the lower edge of the bushing (221) abuts against the upper edge of the guide sleeve (53), so that the first groove (53a) and the second groove (22a) are engaged to form a guide channel (530).

6. The can opener according to claim 5, characterized in that: The guide sleeve (53) extends outward locally on the outer side corresponding to the guide groove (50) to form a reinforcing wall (515), and the thickness of the reinforcing wall (515) gradually increases from the center of the guide groove (50) towards both side walls.

7. The can opener according to claim 6, wherein: The first guide section (501) and the second guide section (502) are arranged vertically, and the connection between them is in an arc transition. The reinforcing wall (515) extends along the length direction of the guide sleeve (53), and the projection of the reinforcing wall (515) on the plane where the guide groove (50) is located can cover the guide groove (50).

8. The can opener according to claim 7, wherein: The driving mechanism (2) further includes a cutter shaft (23). The cutter shaft (23) is drivingly connected to the output gear (22), and its lower end extends below the housing (1). The cutter wheel (3) is connected to the lower end of the cutter shaft (23).

9. The can opener according to claim 8, characterized in that: The cutter shaft (23) is arranged in the guide channel (530) and its upper end passes through the output gear (22). The adjusting member (51) is sleeved on the cutter shaft (23) and can slide along the cutter shaft (23), so as to move up and down relative to the moving seat (5).

10. The can opener according to claim 9, characterized in that: Convex points (222) protrude inward from the inner wall of the bushing (221). A sliding groove (512) for accommodating the convex points (222) is provided on the outer wall of the adjusting member (51). The sliding groove (512) spirally winds around the outer peripheral wall of the adjusting member (51) from top to bottom. Under the rotation of the output gear (22), the convex points (222) can reciprocally slide along the sliding groove (512) to drive the adjusting member (51) to move up and down.

11. The can opener according to claim 10, wherein: A connecting edge (513) is provided at the lower end of the adjusting member (51). The guide post (511) is provided on the connecting edge (513), and there is a gap between the end of the sliding groove (512) and the connecting edge (513), thus forming a retaining groove (514) for accommodating the convex points (222). When the output gear (22) rotates to a state where the convex points (222) are located in the retaining groove (514), the adjusting member (51) and the guide sleeve (53) of the moving seat (5) remain relatively stationary.

12. The can opener according to claim 5, characterized in that: An elastic member (6) is further provided on the moving seat (5). The elastic member (6) acts on the adjusting member (51) so that the adjusting member (51) always has a tendency to move downward.

13. The can opener according to claim 12, characterized in that: The elastic member (6) is a spring sleeved on the cutter shaft (23). The upper end of the spring abuts against the upper end wall of the bushing (221), and the lower end abuts against the upper edge of the adjusting member (51).

14. The can opener according to claim 13, wherein: The drive mechanism (2) further includes an input gear (24) and at least one transmission gear (25) arranged between the input gear (24) and the output gear (22). The output shaft of the driver (21) meshes with the input gear (24), and the input gear (24) meshes with the output gear (22) through the transmission gear (25).

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