A kind of rower assembly and rower device

Abstract

The utility model relates to the field of PCB equipment especially relates to a line wheel assembly and line wheel device. The utility model provides a kind of line wheel assembly, by being set in the runner of line wheel piece, flexible ring is installed in annular groove, can better protect circuit board, by setting annular groove, flexible ring is not easy to fall off, and the installation and disassembly of flexible ring are more convenient, improve the convenience of use. The utility model provides a kind of line wheel device, including line wheel assembly, by setting line wheel assembly, the installation and disassembly of flexible ring are more convenient, improve the convenience of use, by setting line wheel branch and locking assembly, line wheel branch can pass through the mounting hole of multiple line wheel assemblies, the end of line wheel assembly is connected and installed in an organic whole, by setting locking assembly, locking assembly locks the line wheel assembly of line wheel branch two ends in line wheel branch, avoid line wheel assembly to fall off, avoid circuit board to be skew or be damaged due to uneven stress in the process of transportation.

Description

Technical Field

[0001] This utility model relates to the field of PCB equipment, and in particular to a roller assembly and roller device. Background Technology

[0002] Roller rollers are key components in PCB equipment used for conveying and transporting circuit boards, primarily used in the roller drive systems of etching machines, developing machines, and PCB take-up and untake-down machines. During operation, the PCB equipment relies on the rotation of these rollers to transport circuit boards (typically copper plates). Roller rollers are generally made of hard materials; if damage is not detected promptly, the sharp edges can scratch the circuit board, potentially rendering it unusable. Conversely, rollers made of soft materials are prone to deformation, leading to skewed or bent circuit boards.

[0003] To simultaneously ensure the supporting strength and flexibility of the roller bearing, existing technologies generally use a soft material buffer ring wrapped around the outer circumference of a hard material roller bearing, which can basically meet the two requirements. However, the soft material buffer ring in the existing solution is prone to falling off, and disassembly and reassembly are inconvenient when damaged. Therefore, there is an urgent need to propose a solution to address the above problems. Utility Model Content

[0004] The first objective of this invention is to provide a roller assembly that solves the problem in the prior art where the rubber rings on the roller plates are prone to falling off and are inconvenient to disassemble and assemble.

[0005] The second objective of this utility model is to provide a roller device to solve the problems of low reliability and ease of maintenance of existing roller devices.

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

[0007] A roller assembly includes roller plates, each roller plate comprising a mounting portion and a rotating portion. The mounting portion is connected to both sides of the rotating portion along its rotation axis. The mounting portion has mounting holes along the rotation axis of the rotating portion for roller plates to pass through. The rotating portion has an annular groove along its circumference. The roller assembly also includes a flexible ring that can be fitted into the annular groove and is used to support a circuit board. Rotation of the roller plate causes the flexible ring to move the circuit board. The diameter of the flexible ring is greater than the depth of the annular groove. The rotating portion also has an operating notch that extends through the annular groove along the rotation axis of the rotating portion.

[0008] In some embodiments, the mounting portions on both sides of the rotating wheel portion each have mounting protrusions and mounting grooves. The mounting protrusions can be inserted into the mounting grooves of adjacent wheel plates, and the mounting grooves can accommodate the mounting protrusions of adjacent wheel plates.

[0009] In some embodiments, the cross-section of the annular groove is semi-circular.

[0010] In some embodiments, the groove depth of the annular groove is 30%-50% of the wire diameter of the flexible ring.

[0011] In some embodiments, the operating notch is open at the end furthest from the mounting portion.

[0012] In some embodiments, the length of the operating notch along the circumference of the rotating part is 10%-20% of the circumference of the rotating part.

[0013] In some embodiments, the flexible ring is a rubber component.

[0014] A roller device, comprising a roller assembly, the roller device further comprising roller branches, wherein multiple roller assemblies are configured, the multiple roller assemblies abutting end to end and coaxially mounted on the roller branches, the roller device further comprising two sets of locking components, the two sets of locking components being installed one-to-one at both ends of the roller branches, and the two sets of locking components being able to lock the roller assemblies located at both ends of the roller branches one-to-one to the roller branches, the rotation of the roller branches enabling the roller assemblies to drive the circuit board to move.

[0015] In some embodiments, the locking assembly includes a connector and a locking member. The connector has a through hole through which the roller can pass. One end of the connector can abut against the roller assembly, and the other end is provided with a plurality of movable protrusions. The locking member is hollow and can be sleeved on the connector. The locking member can abut against the plurality of movable protrusions to press the plurality of movable protrusions against the roller.

[0016] In some embodiments, the roller device further includes a drive member that is connected to the roller branch drive.

[0017] The beneficial effects of this utility model are:

[0018] This utility model proposes a roller assembly, including a roller wheel, which includes a mounting part and a rotating part. The mounting part is connected to both sides of the rotating part along the rotation axis. The mounting part has mounting holes along the rotation axis of the rotating part for the roller wheel to pass through. The rotating part has an annular groove along its circumference. The roller assembly also includes a flexible ring, which can be fitted into the annular groove and is used to support the circuit board. The rotation of the roller wheel can cause the flexible ring to move the circuit board. The wire diameter of the flexible ring is greater than the groove depth of the annular groove. The rotating part also has an operating notch that extends through the annular groove along the rotation axis of the rotating part. By creating an annular groove in the rotating part of the roller, a flexible ring is installed in the groove. The flexible ring can support and abut against the circuit board. The flexible contact between the flexible ring and the circuit board provides better protection for the circuit board. Furthermore, when the flexible ring is damaged, there are no sharp points, ensuring that the circuit board will not be scratched. In addition, by setting an annular groove, the flexible ring is not easy to fall off, thus avoiding contact between the circuit board and components other than the flexible ring, improving the reliability of the roller assembly. Furthermore, by setting an operating notch, which runs through the annular groove along the rotation axis of the rotating part, when it is necessary to remove the flexible ring, it can be pulled up from the annular groove with fingers for removal. When it is necessary to install the flexible ring, it can be inserted into the operating notch, held down, and then stretched to install the flexible ring into the annular groove. This makes the installation and removal of the flexible ring more convenient, improving the ease of use.

[0019] This utility model proposes a sliding roller device, including a sliding roller assembly. By setting the sliding roller assembly, the flexible ring and the circuit board are in flexible contact, which can better protect the circuit board. Furthermore, when the flexible ring is damaged, there are no sharp points, ensuring that the circuit board will not be scratched. The annular groove prevents the flexible ring from easily falling off, thus avoiding contact between the circuit board and components other than the flexible ring, improving the reliability of the sliding roller assembly. Additionally, the operation notch extends through the annular groove along the rotation axis of the roller, making the installation and removal of the flexible ring more convenient. This design enhances ease of use. By incorporating a roller branch and locking components, the roller branch can pass through the mounting holes of multiple roller components, allowing the roller components to be installed together with their ends grounded. When the roller branch rotates, multiple roller components rotate together to transport the circuit board, improving the structural rationality of the roller device. Furthermore, the locking components secure the roller components at both ends of the roller branch, preventing them from falling off. At the same time, they ensure that the roller components rotate synchronously with the roller branch, preventing the circuit board from being tilted or damaged due to uneven force during transportation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a roller assembly provided in an embodiment of this utility model;

[0022] Figure 2 This is a structural schematic diagram of a roller assembly provided in another embodiment of the present utility model;

[0023] Figure 3 This is an exploded view of a portion of the structure of a roller device provided in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of a roller device provided in an embodiment of this utility model.

[0025] In the picture:

[0026] 1. Roller assembly; 11. Roller wheel piece; 111. Mounting part; 1111. Mounting hole; 1112. Mounting protrusion; 1113. Mounting groove; 112. Rotary wheel part; 1121. Ring groove; 1122. Operating notch; 12. Flexible ring; 2. Roller branch; 3. Locking assembly; 31. Connector; 311. Movable protrusion; 32. Locking element. Detailed Implementation

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

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

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

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

[0031] This embodiment proposes a roller assembly to solve the problem in the prior art that the rubber rings of the roller wheels are easy to fall off and are inconvenient to disassemble and assemble.

[0032] Roller rollers are key components in PCB equipment used for conveying and transporting circuit boards, primarily used in the roller drive systems of etching machines, developing machines, and PCB take-up and untake-down machines. During operation, the PCB equipment relies on the rotation of these rollers to transport circuit boards. Roller rollers are generally made of hard materials; if damage is not detected promptly, the sharp edges can scratch the circuit board, or even render it unusable. Soft roller rollers, on the other hand, are prone to deformation, causing the circuit board to skew or bend. To simultaneously ensure the support strength and flexibility of the roller rollers, current technology typically uses a soft material buffer ring around the outer periphery of a hard roller roller, which generally meets both requirements. However, the soft material buffer ring in existing solutions is prone to detachment, and disassembly and reassembly are inconvenient when damaged.

[0033] To solve this problem, such as Figures 1-2As shown, this embodiment proposes a roller assembly 1, which includes a roller wheel 11. The roller wheel 11 includes a mounting part 111 and a rotating part 112. The mounting part 111 is connected to both sides of the rotating part 112 along the rotation axis. The mounting part 111 has a mounting hole 1111 along the axis of the rotating part 112 for the roller branch 2 to pass through. The rotating part 112 has an annular groove 1121 along its circumference. The roller assembly 1 also includes a flexible ring 12, which can be fitted into the annular groove 1121 and is used to support the circuit board. The rotation of the roller wheel 11 can cause the flexible ring 12 to drive the circuit board to move. The wire diameter of the flexible ring 12 is greater than the groove depth of the annular groove 1121. The rotating part 112 also has an operating notch 1122, which passes through the annular groove 1121 along the rotation axis of the rotating part 112.

[0034] Understandably, by creating an annular groove 1121 in the rotating portion 112 of the roller slab 11, and installing a flexible ring 12 in the annular groove 1121, the flexible ring 12 can support and abut against the circuit board. The flexible ring 12 and the circuit board have flexible contact, which can better protect the circuit board. Furthermore, when the flexible ring 12 is damaged, there are no sharp points, which can also ensure that the circuit board will not be scratched. In addition, by setting the annular groove 1121, the flexible ring 12 is not easy to fall off, thereby avoiding contact between the circuit board and components other than the flexible ring 12, thus improving the performance of the roller assembly 1. To enhance reliability, an operating notch 1122 is provided, which extends through the annular groove 1121 along the rotation axis of the rotating wheel 112. When the flexible ring 12 needs to be removed, it can be pulled up from the annular groove 1121 with a finger through the operating notch 1122 for removal. When the flexible ring 12 needs to be installed, it can be inserted into the operating notch 1122 and held down, then stretched to install the flexible ring 12 into the annular groove 1121. This makes the installation and removal of the flexible ring 12 more convenient, improving ease of use.

[0035] In some optional embodiments, multiple operating notches 1122 are provided, and the multiple operating notches 1122 are spaced apart on the rotating part 112. This arrangement allows the operator to assemble and disassemble the flexible ring 12 from any operating notch 1122, improving the convenience of assembly and disassembly, and thus improving the user experience.

[0036] In some alternative embodiments, the cross-section of the annular groove 1121 is semi-circular. This arrangement makes the shape of the annular groove 1121 more compatible with the circular shape of the flexible ring 12, thereby making the flexible ring 12 less likely to fall off and improving the structural rationality and reliability of the roller assembly 1.

[0037] Of course, the cross-sectional shape of the annular groove 1121 can also be other, and can be adjusted as needed according to the shape of the flexible ring 12. No further restrictions are imposed here.

[0038] In some optional embodiments, the groove depth of the annular groove 1121 is 30%-50% of the wire diameter of the flexible ring 12. This setting ensures that the flexible ring 12 is securely installed in the annular groove 1121 and that the flexible ring 12 stably supports the circuit board, avoiding contact between the circuit board and components other than the flexible ring 12 that could cause scratches, thus improving the reliability of the roller assembly 1.

[0039] For example, the groove depth of the annular groove 1121 is 30%, 35%, 40%, or 45% of the wire diameter of the flexible ring 12. Of course, the ratio of the groove depth of the annular groove 1121 to the wire diameter of the flexible ring 12 is not limited to this; it can be adjusted as needed according to actual requirements, and no further restrictions are imposed here.

[0040] In some alternative embodiments, the end of the operating notch 1122 away from the mounting portion 111 is open. This arrangement makes it easier to install and remove the flexible ring 12, allowing the flexible ring 12 to be pulled outwards for removal or hooked onto the operating notch 1122 for installation, thus improving the structural rationality of the roller assembly 1.

[0041] In some alternative embodiments, the length of the operating notch 1122 along the circumference of the roller portion 112 is 10%-20% of the circumference of the roller portion 112. This arrangement ensures that the size of the operating notch 1122 is convenient for operators to operate, while also preventing the flexible ring 12 from easily falling off or the structural strength of the roller plate 11 from being damaged due to excessive size.

[0042] In some alternative embodiments, the flexible ring 12 is made of rubber. This arrangement gives the flexible ring 12 good flexibility. In addition, rubber is not easily corroded and has a low cost, which improves the reliability of the flexible ring 12 and improves the manufacturing economy of the roller assembly 1.

[0043] This embodiment also proposes a roller device to solve the problems of low reliability and ease of maintenance of existing roller devices.

[0044] like Figures 3-4 As shown, a sliding roller device includes a sliding roller assembly 1 and a sliding roller branch 2. Multiple sliding roller assemblies 1 are configured, with their ends abutting each other and coaxially mounted on the sliding roller branch 2. The sliding roller device also includes two sets of locking components 3, which are installed one-to-one at both ends of the sliding roller branch 2. The two sets of locking components 3 can lock the sliding roller assemblies 1 located at both ends of the sliding roller branch 2 to the sliding roller branch 2. Rotation of the sliding roller branch 2 can cause the sliding roller assembly 1 to drive the circuit board to move.

[0045] Understandably, the roller device proposed in this embodiment, by setting a roller assembly 1, has an annular groove 1121 formed in the rotating part 112 of the roller wheel 11. A flexible ring 12 is installed in the annular groove 1121. The flexible ring 12 can support and abut against the circuit board. The flexible ring 12 and the circuit board have flexible contact, which can better protect the circuit board. Moreover, when the flexible ring 12 is damaged, there are no sharp points, which can also ensure that the circuit board will not be scratched. In addition, by setting the annular groove 1121, the flexible ring 12 is not easy to fall off, thereby avoiding contact between the circuit board and components other than the flexible ring 12. The touch-sensitive design improves the reliability of the roller assembly 1. Furthermore, by providing an operating notch 1122 that extends through the annular groove 1121 along the rotation axis of the roller portion 112, the flexible ring 12 can be easily removed by pulling it up from the annular groove 1121 with a finger when it needs to be disassembled. Conversely, when installing the flexible ring 12, it can be inserted into the operating notch 1122, held down, and then stretched to install itself into the annular groove 1121. This design makes the installation and removal of the flexible ring 12 more convenient, enhancing usability.

[0046] Furthermore, the rolling device proposed in this embodiment, by setting a rolling branch 2 and a locking component 3, allows the rolling branch 2 to pass through the mounting holes 1111 of multiple rolling components 1, and to install the rolling components 1 end to end in one piece. When the rolling branch 2 rotates, multiple rolling components 1 rotate together to transport the circuit board, which improves the structural rationality of the rolling device. In addition, by setting the locking component 3, the rolling components 1 at both ends of the rolling branch 2 are locked to the rolling branch 2 to prevent the rolling components 1 from falling off. At the same time, it ensures that the rolling components 1 and the rolling branch 2 rotate synchronously, preventing the circuit board from being tilted or damaged due to uneven force during transportation.

[0047] In some optional embodiments, the mounting portions 111 on both sides of the rotating wheel portion 112 each have mounting protrusions 1112 and mounting grooves 1113. The mounting protrusions 1112 can be inserted into the mounting grooves 1113 of adjacent roller plates 11, and the mounting grooves 1113 can accommodate the mounting protrusions 1112 of adjacent roller plates 11. This arrangement facilitates the assembly of roller plates 11 together and enables multiple roller assemblies 1 to rotate synchronously, avoiding uneven rotation that could cause the circuit board to tilt or be damaged, thus improving the structural rationality of the roller assembly 1.

[0048] For example, the mounting portion 111 is columnar, the mounting hole 1111 is axially formed at the center of the mounting portion 111, and the mounting protrusion 1112 is plate-shaped. This configuration reduces the weight of the mounting portion 111 and improves the portability of the roller assembly 1.

[0049] For example, two mounting protrusions 1112 are provided, and the radial cross-section of both mounting protrusions 1112 is arc-shaped, forming a mounting groove 1113 between the two mounting protrusions 1112. This arrangement reduces structural damage to the mounting portion 111, thereby reducing the difficulty of creating the mounting groove 1113. Furthermore, the shape of the mounting protrusions 1112 is adapted to the mounting groove 1113 of the adjacent roller wheel slab 11, improving the structural integrity and reliability of the roller assembly 1.

[0050] In some optional embodiments, the locking assembly 3 includes a connector 31 and a locking member 32. The connector 31 has a through hole through which the roller 2 can pass. One end of the connector 31 can abut against the roller assembly 1, and the other end is provided with a plurality of movable protrusions 311. The locking member 32 is hollow and can be sleeved on the connector 31. The locking member 32 can abut against the plurality of movable protrusions 311 to press the plurality of movable protrusions 311 against the roller 2.

[0051] Understandably, by providing the connector 31, the connector 31 can abut against the roller assembly 1, and the movable protrusion 311 of the connector 31 can abut against the roller branch 2. When the locking member 32 is fitted onto the connector 31, the locking member 32 forces the movable protrusion 311 to close, and the movable protrusion 311 abuts against the roller branch 2, thereby locking the roller assembly 1 to the roller branch 2 by the locking member 3.

[0052] For example, the connector 31 is configured as a hollow structure and can be fitted onto the mounting portion 111 of the roller assembly 1. A limiting protrusion is provided in the cavity of the connector 31, which can be inserted into the mounting groove 1113 of the roller assembly 1. This configuration further ensures that the connector 31 is securely connected to the roller assembly 1, thereby securing the roller assembly 1 to the roller branch 2 and ensuring synchronous rotation with the roller branch 2.

[0053] For example, the connector 31 is cylindrical, and multiple movable protrusions 311 are provided, with the radial cross-section of each movable protrusion 311 being arc-shaped. The multiple movable protrusions 311 are spaced apart at one end of the connector 31. This arrangement makes it easier for the connector 31 to cooperate with the roller branch 2, and makes the movable protrusions 311 fit the shape of the connector 31. The multiple movable protrusions 311 increase the strength of the contact with the roller branch 2, thereby improving the reliability of the roller device.

[0054] For example, the movable protrusion 311 has a slot on the side near the connector 31, and the locking member 32 has a snap-fit ​​protrusion in its cavity, which can snap into the slot. This design makes it difficult for the locking member 32 to fall off the connector 31, improving locking stability and thus improving the reliability of the roller device.

[0055] In some alternative embodiments, the roller assembly further includes a drive member that is kinetically connected to the roller branch 2. This arrangement allows the roller branch 2 to rotate to move the circuit board, improving the structural rationality of the roller assembly.

[0056] For example, the driving component is a servo motor. This configuration gives the driving component good start-stop flexibility, thereby improving the transport flexibility of the circuit board. In other embodiments, other types of components can also be used as the driving component, which can be adjusted as needed according to actual requirements, and no further restrictions are imposed here.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A roller assembly, characterized in that, The rolling assembly includes a rolling wheel (11), which includes a mounting part (111) and a rotating part (112). The mounting part (111) is connected to both sides of the rotating part (112) along the rotation axis. The mounting part (111) has a mounting hole (1111) along the rotation axis of the rotating part (112) for the rolling wheel branch (2) to pass through. The rotating part (112) has an annular groove (1121) along its circumference. The component also includes a flexible ring (12), which can be fitted into the annular groove (1121) and used to support the circuit board. The rotation of the roller (11) can cause the flexible ring (12) to drive the circuit board to move. The wire diameter of the flexible ring (12) is greater than the groove depth of the annular groove (1121). The rotating part (112) is also provided with an operating notch (1122), which penetrates the annular groove (1121) along the rotation axis of the rotating part (112).

2. The roller assembly according to claim 1, characterized in that, The mounting portions (111) on both sides of the rotating wheel portion (112) each have mounting protrusions (1112) and mounting grooves (1113). The mounting protrusions (1112) can be inserted into the mounting grooves (1113) of the adjacent row wheel pieces (11), and the mounting grooves (1113) allow the mounting protrusions (1112) of the adjacent row wheel pieces (11) to be inserted.

3. The roller assembly according to claim 1, characterized in that, The cross-section of the annular groove (1121) is semi-circular.

4. The roller assembly according to claim 1, characterized in that, The groove depth of the annular groove (1121) is 30%-50% of the wire diameter of the flexible ring (12).

5. The roller assembly according to claim 1, characterized in that, The operating notch (1122) is open at the end away from the mounting part (111).

6. The roller assembly according to claim 1, characterized in that, The length of the operating notch (1122) along the circumference of the rotating part (112) is 10%-20% of the circumference of the rotating part (112).

7. The roller assembly according to any one of claims 1-6, characterized in that, The flexible ring (12) is a rubber component.

8. A roller device, characterized in that, The device includes the roller assembly as described in any one of claims 1-7, and the roller device further includes roller branches (2). The roller assembly is configured as a plurality of roller assemblies, the plurality of roller assemblies abutting each other end to end and coaxially mounted on the roller branches (2). The roller device further includes two sets of locking components (3). The two sets of locking components (3) are installed one-to-one at both ends of the roller branches (2), and the two sets of locking components (3) can lock the roller assemblies located at both ends of the roller branches (2) one-to-one to the roller branches (2). The rotation of the roller branches (2) can cause the roller assemblies to drive the circuit board to move.

9. The roller device according to claim 8, characterized in that, The locking assembly (3) includes a connector (31) and a locking member (32). The connector (31) has a through hole through which the roller (2) can pass. One end of the connector (31) can abut against the roller assembly, and the other end is provided with multiple movable protrusions (311). The locking member (32) is hollow and can be fitted onto the connector (31). The locking member (32) can abut against the multiple movable protrusions (311) to press the multiple movable protrusions (311) against the roller (2).

10. The roller device according to claim 8, characterized in that, The roller device also includes a drive component, which is connected to the roller branch (2) in a transmission manner.

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