Primary-secondary wheel line pressing mechanism

Abstract

The utility model relates to a primary-secondary wheel line pressing mechanism, which comprises an upper pressing wheel module, a lower pressing wheel module and a transmission shaft, the upper pressing wheel module comprises an upper frame and an upper pressing wheel, and the lower pressing wheel module comprises a lower frame and a lower pressing wheel; the upper frame is installed on an upper pressing wheel beam in a sliding mode, the lower frame is installed on a lower pressing wheel beam in a sliding mode, the transmission shaft penetrates through the lower pressing wheels, the upper pressing wheel beam is provided with an upper rack, and each upper pressing wheel module is provided with an upper driving motor. The upper driving motor is mounted on the upper frame and is provided with an upper gear meshed with the upper rack; the lower pressing wheel beam is provided with a lower rack, each lower pressing wheel module is provided with a lower driving motor, and the lower driving motors are installed on the lower frame and provided with lower gears meshed with the lower racks. According to the mechanism, the swing speed and swing precision of the upper pressing wheel and the lower pressing wheel can be remarkably improved, and rapid adjustment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of carton machines, in particular to a mother-and-son wheel creasing mechanism of a carton machine. Background Art

[0002] For the creasing of carton forming machines, a creasing mechanism that combines a creasing wheel and a rubber roller is mostly adopted. This kind of creasing mechanism can only perform single-sided creasing, and the creasing effect is not ideal enough; the paper separating and creasing machine adopts a creasing method that combines mother-and-son wheels, but its upper and lower wheels are respectively fixed on a rotating shaft, and the upper or lower wheel needs to be lifted and lowered synchronously, and it is impossible to lift and lower separately.

[0003] The double-sided indentation device for compressible materials disclosed in CN 220763693 U is provided with an upper indentation assembly and a lower indentation assembly; the upper indentation assembly includes an upper indentation driving assembly, an upper indentation fixing assembly and an upper indentation wheel assembly; the lower indentation assembly includes a lower indentation driving assembly, a lower indentation fixing assembly and a lower indentation wheel assembly; the upper indentation wheel assembly is detachably arranged on the upper indentation driving assembly, and the upper indentation wheel assembly is slidably arranged on the upper indentation fixing assembly; the lower indentation wheel assembly is detachably arranged on the lower indentation driving assembly, and the lower indentation wheel assembly is slidably arranged on the lower indentation fixing assembly. The upper and lower surfaces of the compressible material are respectively creased by the upper indentation assembly and the lower indentation assembly.

[0004] However, due to the single mechanism movement mode adopted by its mother-and-son wheels, the speed of adjusting the position is slow and the accuracy is poor, and the rotating shaft penetrates through the lower wheel, so that the lower wheel cannot be replaced quickly. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a mother-and-son wheel creasing mechanism to solve the above technical problems.

[0006] To achieve the above purpose, the mother-and-son wheel creasing mechanism provided by the utility model includes a plurality of groups of upper and lower corresponding upper press wheel modules, lower press wheel modules and a transmission shaft. The upper press wheel module includes an upper frame and an upper press wheel, and the lower press wheel module includes a lower frame and a lower press wheel; the upper frame is slidably installed on the upper press wheel beam, the lower frame is slidably installed on the lower press wheel beam, the transmission shaft penetrates through each of the lower press wheels, the lower press wheel can move horizontally along the transmission shaft and can rotate following the transmission shaft, the upper press wheel beam is provided with an upper rack extending along its length direction, each of the upper press wheel modules is respectively provided with an upper driving motor for driving it to move along the upper rack, the upper driving motor is installed on the upper frame and is provided with an upper gear meshing with the upper rack; the lower press wheel beam is provided with a lower rack extending along its length direction, each of the lower press wheel modules is respectively provided with a lower driving motor for driving it to move along the lower rack, the lower driving motor is installed on the lower frame and is provided with a lower gear meshing with the lower rack.

[0007] Optionally, each of the upper pressure wheel modules is provided with a cylinder for driving the upper pressure wheel to act independently. One end of the cylinder is connected to the upper frame, and the other end of the cylinder is connected to the upper pressure wheel mounting seat.

[0008] Optionally, the lower pressure wheel is of a split and spliced structure, including a first lower pressure wheel half body, a second lower pressure wheel half body and a hub. The hub is rotatably mounted on the lower pressure wheel mounting seat, and after the first lower pressure wheel half body and the second lower pressure wheel half body are spliced, they are respectively fixed to the end face of the hub through connecting pieces.

[0009] Optionally, the two outermost groups of the upper pressure wheel modules and the lower pressure wheel modules are respectively provided with auxiliary paper pressing wheels arranged coaxially with the upper pressure wheel and the lower pressure wheel.

[0010] Optionally, the upper frame is mounted on the upper pressure wheel beam through a first upper slide rail and a second upper slide rail. The first upper slide rail is located on the front side of the upper pressure wheel beam, and the second upper slide rail is located at the bottom of the upper pressure wheel beam. The lower frame is mounted on the lower pressure wheel beam through a first lower slide rail and a second lower slide rail. Both the first lower slide rail and the second lower slide rail are located on the top of the lower pressure wheel beam.

[0011] Optionally, the upper frame is a U-shaped frame with an opening facing the rear side, including a first horizontal connecting plate, an upper vertical connecting plate and a second horizontal connecting plate. At least part of the upper pressure wheel beam is located in the opening of the upper frame. The upper rack is located on the top of the upper pressure wheel beam, the upper driving motor is located above the first horizontal connecting plate, and the upper gear is located below the first horizontal connecting plate. A first upper slider matched with the first upper slide rail is arranged on the inner side of the upper vertical connecting plate, a second upper slider matched with the second upper slide rail is arranged above the second horizontal connecting plate, and the upper pressure wheel is located below the second horizontal connecting plate.

[0012] Optionally, the lower frame is a U-shaped frame with an opening facing the rear side, including a third horizontal connecting plate, a lower vertical connecting plate and a fourth horizontal connecting plate. At least part of the lower pressure wheel beam is located in the opening of the lower frame. The lower rack is located at the bottom of the lower pressure wheel beam. A first lower slider and a second lower slider matched with the first lower slide rail and the second lower slide rail are arranged below the third horizontal connecting plate. The lower pressure wheel is located above the third horizontal connecting plate. The lower driving motor is located below the fourth horizontal connecting plate, and the lower gear is located above the fourth horizontal connecting plate.

[0013] Optionally, the upper pressure wheel beam and the lower pressure wheel beam are arranged in a staggered manner in the front-rear direction.

[0014] Optionally, the upper rack and the lower rack are helical racks, and the upper gear and the lower gear are helical gears.

[0015] Optionally, the upper rack is mounted on the top of the upper pressure wheel beam through an upper bracket, with its tooth surface facing the front side; the lower rack is mounted on the bottom of the lower pressure wheel beam through a lower bracket, with its tooth surface facing the front side.

[0016] The mother-daughter wheel wire pressing mechanism provided by the present utility model, compared with the wire pressing wheel scheme of the carton forming machine, not only solves the problem of poor wire pressing effect of a single wire pressing wheel and inability to press the reverse side, optimizes the wire pressing effect, but also the upper pressure wheel module and the lower pressure wheel module respectively adopt independent motors to drive the upper pressure wheel and the lower pressure wheel, and each upper pressure wheel and lower pressure wheel can move independently, greatly improving the swing speed and swing accuracy when the upper pressure wheel and the lower pressure wheel move horizontally, enabling quick adjustment, so that when processing cartons, the time required for adjustment can be reduced, and the production efficiency can be further improved. Description of the Drawings

[0017] Figure 1 Is an axonometric view of the mother-daughter wheel wire pressing mechanism provided by the first embodiment of the present utility model;

[0018] Figure 2 Is Figure 1 The front view of the mother-daughter wheel wire pressing mechanism shown;

[0019] Figure 3 Is Figure 2 The left view of the mother-daughter wheel wire pressing mechanism shown;

[0020] Figure 4 Is a schematic diagram of the lower pressure wheel of the lower pressure wheel module being a split and spliced structure;

[0021] Figure 5 Is Figure 2 The partial enlarged view of the I part in;

[0022] Figure 6 Is a schematic diagram of the outermost upper pressure wheel and lower pressure wheel being provided with auxiliary paper pressing wheels.

[0023] In the figure:

[0024] 41 - Upper pressure wheel module; 411 - Upper frame; 4111 - First horizontal connecting plate; 4112 - Upper vertical connecting plate; 4113 - Second horizontal connecting plate; 412 - Upper pressure wheel; 413 - Upper driving motor; 414 - Upper gear; 415 - Upper pressure wheel mounting seat; 416 - First upper slide rail; 417 - Second upper slide rail; 418 - First upper slider; 419 - Second upper slider; 42 - Lower pressure wheel module; 421 - Lower frame; 4211 - Third horizontal connecting plate; 4212 - Lower vertical connecting plate; 4213 - Fourth horizontal connecting plate; 422 - Lower pressure wheel; 4221 - First lower pressure wheel half body; 4222 - Second lower pressure wheel half body; 4223 - Hub; 4224 - Lower pressure wheel mounting seat; 423 - Lower driving motor; 424 - Lower gear; 426 - First lower slide rail; 427 - Second lower slide rail; 428 - First lower slider; 429 - Second lower slider; 43 - Upper pressure wheel beam; 44 - Lower pressure wheel beam; 45 - Transmission shaft; 451 - Pulley; 46 - Upper rack; 47 - Lower rack; 48 - Cylinder; 49 - Auxiliary paper pressing wheel. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific implementation manners.

[0026] In this article, terms such as "upper, lower, inner, outer" are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope; moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0027] Please refer to Figure 1 、 Figure 2 , Figure 1 is an axonometric view of the mother - daughter wheel wire pressing mechanism provided in the first embodiment of the present utility model; Figure 2 is Figure 1 the front view of the mother - daughter wheel wire pressing mechanism shown in

[0028] As shown in the figure, in a specific embodiment, the mother - daughter wheel wire pressing mechanism provided by the present utility model has four groups of upper and lower corresponding upper pressure wheel modules 41 and lower pressure wheel modules 42. Among them, the upper pressure wheel module 41 is provided with an upper frame 411 and an upper pressure wheel 412, and the lower pressure wheel module 42 is provided with a lower frame 421 and a lower pressure wheel 422. The upper pressure wheel 412 is installed on the upper pressure wheel beam 43 through the upper frame 411 and can slide horizontally along the upper pressure wheel beam 43. The lower pressure wheel 422 is installed on the lower pressure wheel beam 44 through the lower frame 421 and can slide horizontally along the lower pressure wheel beam 44.

[0029] The transmission shaft 45 is a hexagonal shaft with a hexagonal cross-section. A pulley 451 is provided at one end. The transmission shaft 45 runs through four lower pressing wheels 422 in the transverse direction. The lower pressing wheels 422 are provided with hexagonal shaft holes that can be sleeved on the transmission shaft 45. The lower pressing wheels 422 can move transversely along the transmission shaft 45 and can rotate together with the transmission shaft 45 when the transmission shaft 45 rotates.

[0030] The upper pressing wheel beam 43 is provided with an upper rack 46 extending along its length direction. Each upper pressing wheel module 41 is respectively provided with an upper driving motor 413 for driving it to move along the upper rack 46. The upper driving motor 413 is installed on the upper frame 411 and is provided with an upper gear 414 meshing with the upper rack 46.

[0031] The lower pressing wheel beam 44 is provided with a lower rack 47 extending along its length direction. Each lower pressing wheel module 42 is respectively provided with a lower driving motor 423 for driving it to move along the lower rack 47. The lower driving motor 423 is installed on the lower frame 421 and is provided with a lower gear 424 meshing with the lower rack 47.

[0032] Each upper pressing wheel module 41 is respectively provided with a cylinder 48. One end of the cylinder 48 is connected to the upper frame 411, and the other end of the cylinder 48 is connected to the upper pressing wheel mounting seat 415. When the cylinder 48 makes a telescopic movement, it can drive the upper pressing wheel 412 to act independently.

[0033] The two outermost groups of upper pressing wheel modules 41 are respectively provided with auxiliary paper pressing wheels 49 arranged coaxially with the upper pressing wheels 412. Similarly, the two outermost groups of lower pressing wheel modules 42 are respectively provided with auxiliary paper pressing wheels 49 arranged coaxially with the lower pressing wheels 422 (see Figure 6 ). By adding the auxiliary paper pressing wheels 49, the problem of warping of some cardboard can be effectively solved, and the phenomenon of the cardboard being scratched when the edge warps and hits the slitting knife during the processing of the cardboard can be avoided.

[0034] Please also refer to Figure 3 、 Figure 4 , Figure 3 is Figure 2 the left view of the mother-daughter wheel wire pressing mechanism shown; Figure 4 is the schematic diagram of the lower pressing wheel of the lower pressing wheel module being a split and spliced structure.

[0035] As shown in the figure, the upper frame 411 is installed on the upper pressing wheel 43 beam through the first upper slide rail 416 and the second upper slide rail 417. The first upper slide rail 416 is located on the front side of the upper pressing wheel beam 43, and the second upper slide rail 417 is located at the bottom of the upper pressing wheel beam 43; the lower frame 421 is installed on the lower pressing wheel beam 44 through the first lower slide rail 426 and the second lower slide rail 427. Both the first lower slide rail 426 and the second lower slide rail 427 are located on the top of the lower pressing wheel beam 44.

[0036] The upper frame 411 and the lower frame 421 are respectively slidably fitted with the upper pressure wheel beam 43 and the lower pressure wheel beam 44 by double guide rails, which can ensure the structural stability of the upper pressure wheel module 41 and the lower pressure wheel module 42.

[0037] Specifically, the upper frame 411 is a U-shaped frame with an opening facing the rear side. It has a first horizontal connecting plate 4111, an upper vertical connecting plate 4112, and a second horizontal connecting plate 4113. A part of the upper pressure wheel beam 43 is located in the opening of the upper frame 411; the upper rack 46 is installed on the top of the upper pressure wheel beam 43 through an upper L-shaped bracket, and its tooth surface faces the front side; the upper driving motor 413 is vertically installed above the first horizontal connecting plate 4111, and its rotating shaft passes through the first horizontal connecting plate 4111 and is connected to the upper gear 414. The upper gear 414 is located below the first horizontal connecting plate 4111 so as to mesh with the upper rack 46.

[0038] A first upper slider 418 is provided inside the upper vertical connecting plate 4112 to slidably cooperate with the first upper slide rail 416 through the first upper slider 418. A second upper slider 419 is provided above the second horizontal connecting plate 4113 to slidably cooperate with the second upper slide rail 417 through the second upper slider 419. The upper pressure wheel 412 is located below the second horizontal connecting plate 4113.

[0039] The lower frame 421 is a U-shaped frame with an opening facing the rear side. It has a third horizontal connecting plate 4211, a lower vertical connecting plate 4212, and a fourth horizontal connecting plate 4213. A part of the lower pressure wheel beam 44 is located in the opening of the lower frame 421; the lower rack 47 is installed on the bottom of the lower pressure wheel beam 44 through a lower L-shaped bracket, and its tooth surface faces the front side; the lower pressure wheel 422 is located above the third horizontal connecting plate 4211. A first lower slider 428 and a second lower slider 429 are provided below the third horizontal connecting plate 4211 to slidably cooperate with the first lower slide rail 426 and the second lower slide rail 427 through the first lower slider 428 and the second lower slider 429. The lower driving motor 423 is vertically installed below the fourth horizontal connecting plate 4213, and its rotating shaft passes through the fourth horizontal connecting plate 4213 and is connected to the lower gear 422. The lower gear 422 is located above the fourth horizontal connecting plate 4213 so as to mesh with the lower rack 47.

[0040] Since the sliding installation methods of the upper frame 411 and the lower frame 421 are not exactly the same, the upper pressure wheel beam 43 and the lower pressure wheel beam 44 can be staggered by a certain distance in the front-rear direction to meet the alignment requirements of the upper pressure wheel 412 and the lower pressure wheel 422. At the same time, the upper rack 46 and the lower rack 47 are helical racks, and the upper gear 414 and the lower gear 424 are helical gears.

[0041] The lower pressing wheel 422 has a split and spliced structure, which includes a first lower pressing wheel half body 4221, a second lower pressing wheel half body 4222 and a hub 4223. The hub 4223 is rotatably installed on the lower pressing wheel mounting seat 4224. The inner hole of the hub 4223 is a hexagonal hole, so as to be slidably matched with the transmission shaft 45 and driven to rotate by the transmission shaft 45. The first lower pressing wheel half body 4221 and the second lower pressing wheel half body 4222 can be respectively fixed to the end face of the hub 4223 by screws, so as to be spliced into a complete circle. The inner hole after splicing the two can be a round hole to pass through the transmission shaft 45. When it is necessary to remove the lower pressing wheel 422, loosening the screws can remove the first lower pressing wheel half body 4221 and the second lower pressing wheel half body 4222 from the hub 4223.

[0042] Since the lower pressing wheel 422 is mounted on the relatively long transmission shaft 45, it is very cumbersome to replace the traditional lower pressing wheel 422, and the whole mechanism needs to be disassembled to replace the lower pressing wheel. After the lower pressing wheel 422 of this embodiment is designed as a spliced structure, when replacing the lower pressing wheel 422, the hub 4223 does not need to be replaced, but only the first lower pressing wheel half body 4221 and the second lower pressing wheel half body 4222 on one side of the hub 4223 need to be replaced, which can realize the quick disassembly and installation of the lower pressing wheel 422.

[0043] Please continue to refer to Figure 5 、 Figure 6 , Figure 5 is Figure 2 the partial enlarged view of part I in Figure 6 is the schematic structural diagram of the outermost upper pressing wheel and lower pressing wheel provided with auxiliary paper pressing wheels.

[0044] As shown in the figure, the upper pressing wheel 412 and the lower pressing wheel 422 press the cardboard in the form of a parent-child wheel. When the cardboard passes between the upper pressing wheel 412 and the lower pressing wheel 422, the upper pressing wheel 412 is used to press the front side of the cardboard, and the lower pressing wheel 422 is used to press the back side of the cardboard to form the creases required when the cardboard is folded into a carton.

[0045] The surface of the upper pressing wheel 412 is provided with two first annular protrusions a distributed at intervals. The surface of the lower pressing wheel 422 is provided with a second annular protrusion b. The second annular protrusion b is axially located between the two first annular protrusions a. A third annular protrusion c spaced from it is respectively provided on both sides of the second annular protrusion b. The height and width of the third annular protrusion c are both smaller than those of the second annular protrusion b.

[0046] Through the cooperation of the first annular protrusion a, the second annular protrusion b and the third annular protrusion c, a more ideal pressing line effect can be obtained.

[0047] The above embodiments are only the preferred solutions of the present utility model, and are not specifically limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation manners. For example, according to needs, the number of the upper pressing wheel module 41 and the lower pressing wheel module 42 can be further increased or decreased, etc. Since there are many possible implementation manners, they will not be enumerated one by one here.

[0048] The upper pressing wheel module 41 and the lower pressing wheel module 42 of the present utility model respectively adopt independent motors to drive the upper pressing wheel 412 and the lower pressing wheel 422. Each of the upper pressing wheel 412 and the lower pressing wheel 422 can move independently, which greatly improves the swinging speed and swinging accuracy when the upper pressing wheel 412 and the lower pressing wheel 422 move horizontally, and can achieve rapid adjustment. Therefore, when processing cartons, rapid adjustment can be carried out, the time required for adjustment can be reduced, and the production efficiency can be further improved. Moreover, both the upper pressing wheel 412 and the lower pressing wheel 422 can be quickly replaced.

[0049] The above has introduced the mother-daughter wheel wire pressing mechanism provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A mother-and-son wheel pressing mechanism, comprising a plurality of groups of upper and lower corresponding upper pressing wheel modules, lower pressing wheel modules and a transmission shaft. The upper pressing wheel module includes an upper frame and an upper pressing wheel, and the lower pressing wheel module includes a lower frame and a lower pressing wheel. The upper frame is slidably mounted on the upper pressing wheel beam, the lower frame is slidably mounted on the lower pressing wheel beam, the transmission shaft penetrates through each of the lower pressing wheels, and the lower pressing wheels can move laterally along the transmission shaft and can rotate following the transmission shaft. It is characterized in that, The upper pressure wheel beam is provided with an upper rack extending along its length direction. Each of the upper pressure wheel modules is respectively provided with an upper driving motor for driving it to move along the upper rack. The upper driving motor is installed on the upper frame and is provided with an upper gear meshing with the upper rack. The lower pressure wheel beam is provided with a lower rack extending along its length direction. Each of the lower pressure wheel modules is respectively provided with a lower driving motor for driving it to move along the lower rack. The lower driving motor is installed on the lower frame and is provided with a lower gear meshing with the lower rack.

2. The mother-and-son wheel wire pressing mechanism according to claim 1, wherein, Each of the upper pressure wheel modules is respectively provided with a cylinder for driving the upper pressure wheel to act independently. One end of the cylinder is connected to the upper frame, and the other end of the cylinder is connected to the upper pressure wheel mounting seat.

3. The mother-and-son wheel wire pressing mechanism according to claim 1, characterized in that, The lower pressure wheel is of a split and spliced structure, including a first lower pressure wheel half body, a second lower pressure wheel half body and a hub. The hub is rotatably installed on the lower pressure wheel mounting seat. After the first lower pressure wheel half body and the second lower pressure wheel half body are spliced, they are respectively fixed to the end face of the hub through connecting pieces.

4. The mother-and-son wheel wire pressing mechanism according to claim 1, wherein The two groups of the outermost upper pressure wheel modules and lower pressure wheel modules are respectively provided with auxiliary paper pressing wheels coaxially arranged with the upper pressure wheel and the lower pressure wheel.

5. The mother-and-son wheel wire pressing mechanism according to claim 1, characterized in that The upper frame is installed on the upper pressure wheel beam through a first upper slide rail and a second upper slide rail. The first upper slide rail is located at the front side of the upper pressure wheel beam, and the second upper slide rail is located at the bottom of the upper pressure wheel beam. The lower frame is installed on the lower pressure wheel beam through a first lower slide rail and a second lower slide rail. Both the first lower slide rail and the second lower slide rail are located at the top of the lower pressure wheel beam.

6. The mother-and-son wheel wire pressing mechanism according to claim 5, characterized in that, The upper frame is a U-shaped frame with an opening facing the rear side, including a first transverse connecting plate, an upper vertical connecting plate and a second transverse connecting plate. At least part of the upper pressure wheel beam is located in the opening of the upper frame. The upper rack is located at the top of the upper pressure wheel beam. The upper driving motor is located above the first transverse connecting plate, and the upper gear is located below the first transverse connecting plate. A first upper slider cooperating with the first upper slide rail is arranged on the inner side of the upper vertical connecting plate. A second upper slider cooperating with the second upper slide rail is arranged above the second transverse connecting plate. The upper pressure wheel is located below the second transverse connecting plate.

7. The mother-daughter wheel wire pressing mechanism according to claim 6, characterized in that, The lower frame is a U-shaped frame with an opening facing the rear side, including a third transverse connecting plate, a lower vertical connecting plate and a fourth transverse connecting plate. At least part of the lower pressure wheel beam is located in the opening of the lower frame. The lower rack is located at the bottom of the lower pressure wheel beam. A first lower slider and a second lower slider cooperating with the first lower slide rail and the second lower slide rail are arranged below the third transverse connecting plate. The lower pressure wheel is located above the third transverse connecting plate. The lower driving motor is located below the fourth transverse connecting plate, and the lower gear is located above the fourth transverse connecting plate.

8. The mother-and-son wheel wire pressing mechanism according to claim 7, wherein, The upper pressure wheel beam and the lower pressure wheel beam are arranged in a staggered manner in the front-rear direction.

9. The mother-and-son wheel wire pressing mechanism according to claim 8, characterized in that, The upper rack and the lower rack are helical racks, and the upper gear and the lower gear are helical gears.

10. The mother-and-son wheel wire pressing mechanism according to claim 9, characterized in that The upper rack is installed on the top of the upper pressure wheel beam through an upper bracket, and its tooth surface faces the front side. The lower rack is installed on the bottom of the lower pressure wheel beam through a lower bracket, and its tooth surface faces the front side.

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