pos machine

Abstract

The application relates to the technical field of POS machines, and provides a POS machine which comprises a face shell and a bottom shell connected together; a printer assembly and a control circuit board are arranged on the face shell; a first electric connection part is arranged on the printer assembly; a second electric connection part is arranged on the control circuit board and is spaced from the first electric connection part; a third electric connection part is arranged on the bottom shell; the bottom shell is connected with the face shell oppositely so that the third electric connection part is connected with the first electric connection part and the second electric connection part. When the POS machine is disassembled, the disassembling action of the face shell and the bottom shell can automatically remove the conduction state of the printer assembly and the control circuit board; the third electric connection part leaves the face shell with the bottom shell; an operator does not need to touch the first electric connection part, the second electric connection part and the third electric connection part; mechanical damage and electrical faults of the electric connection structure caused by disassembling operation are avoided; and the maintainability and reliability of the product are improved.

Description

Technical Field

[0001] This application relates to the field of POS machine technology, and in particular provides a POS machine. Background Technology

[0002] A POS (Point of Sale) is a multi-functional terminal used for mobile sales across various industries. By connecting to a computer network, a POS machine enables automatic electronic fund transfers, supporting functions such as purchases, pre-authorization, balance inquiries, and transfers. It is secure, fast, and reliable to use. The POS machine has a small printer that prints payment receipts for customers; the POS machine's control circuit board is electrically connected to the printer, enabling two-way communication of data commands and status information. Existing POS machines achieve telecommunication communication between the control circuit board and the printer by connecting a long conductive element between them. However, when disassembling the machine, the operator needs to manually disconnect the conductive element between the printer and the control circuit board. This process is very prone to errors due to improper operation, such as pulling the conductive element and causing it to break or break, or damaging the original assembly of the conductive element, thereby affecting the telecommunication communication effect. Utility Model Content

[0003] The purpose of this application is to provide a POS machine that solves the problem that when a current POS machine is disassembled, the circuit structure between the printer and the control circuit board needs to be manually disconnected, which can easily damage conductive components.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: This application provides a POS machine, including a front shell and a bottom shell that are joined together. A printer assembly and a control circuit board are mounted on the front shell. The printer assembly has a first electrical connection portion, and the control circuit board has a second electrical connection portion spaced apart from the first electrical connection portion. A third electrical connection portion is provided on the bottom shell, and the bottom shell and the front shell are joined together so that the third electrical connection portion is connected to the first electrical connection portion and the second electrical connection portion.

[0005] The beneficial effects of the POS machine of this application are as follows: a first electrical connection part is provided on the printer assembly, and a second electrical connection part is provided on the control circuit board spaced apart from the first electrical connection part; by providing a third electrical connection part on the bottom shell, after the front shell and the bottom shell are mechanically joined together, the third electrical connection part on the bottom shell can be connected precisely between the first electrical connection part and the second electrical connection part. The joining action of the front shell and the bottom shell will automatically realize the electrical conduction between the printer assembly and the control circuit board; when disassembling the machine, the separation action of the front shell and the bottom shell will automatically release the conductive state between the printer assembly and the control circuit board. The third electrical connection part leaves the front shell with the bottom shell, without affecting the subsequent disassembly steps. The operator does not need to contact the first electrical connection part, the second connection part, and the third connection part, realizing "non-contact" disconnection and physically avoiding the possibility of human damage.

[0006] When the printer is disassembled and reassembled, simply aligning the front and back covers will automatically and reliably restore the electrical connection between the printer components and the control circuit board. No manual alignment or plugging / unplugging is required, which avoids mechanical damage and electrical faults to the electrical connection structure caused by disassembly and reassembly, thus improving the maintainability and reliability of the product.

[0007] In some embodiments, the front shell has an accommodating space, and the printer assembly is disposed within the accommodating space; the bottom shell has a raised portion protruding toward the front shell, and the third connecting portion is disposed on the end face of the raised portion toward the front shell; the raised portion is embedded in the accommodating space, such that the two ends of the third electrical connecting portion are respectively pressed against the first electrical connecting portion and the second electrical connecting portion.

[0008] In some embodiments, the third electrical connection is flexible and is attached to the raised portion.

[0009] In some embodiments, the third electrical connection portion is a strip of conductive cloth.

[0010] In some embodiments, the first electrical connection includes a first conductive element electrically connected to the printer assembly.

[0011] In some embodiments, the second conductive portion includes a second conductive element disposed in the accommodating space and an extension electrically connected between the second conductive element and the control circuit board; the two ends of the third electrical connection portion are respectively pressed onto the first conductive element and the second conductive element.

[0012] In some embodiments, the first conductive element is made of conductive foam, and the second conductive element is made of conductive foam.

[0013] In some embodiments, the faceplate includes a faceplate body and a mounting base disposed at one end of the faceplate body; the control circuit board is disposed on the faceplate body, and the mounting base has the accommodating space.

[0014] In some embodiments, the mounting base includes a tray, a base plate disposed on the side of the tray away from the main body of the faceplate, and side plates respectively connected to both sides of the base plate; the tray, the base plate, and the side plates on both sides enclose the accommodating space; the printer assembly is disposed on the base plate, and the second conductive portion is located on the side of the tray closer to the main body of the faceplate.

[0015] In some embodiments, the printer assembly includes a drive motor, and the end face of the raised portion has a clearance for avoiding the drive motor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a POS machine provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the front shell of a POS machine provided in an embodiment of this application; Figure 3 This is a schematic diagram of the bottom shell of a POS machine provided in one embodiment of this application; Figure 4 This is a partial cross-sectional structural diagram of a POS machine provided in an embodiment of this application.

[0018] The following are the labeling elements in the figure: 100. Top cover assembly; 1. Faceplate; 110. Accommodation space; 100. Faceplate body; 200. Mounting base; 2. Bottom shell; 210. Third electrical connection part; 3. Printer assembly; 310. First electrical connection; 320. Drive motor; 4. Control circuit board; 410. Second electrical connection part; 5. Raised portion; 6. First conductive element; 7. Second conductive element; 8. Extension; 9. Pallet; 10. Base plate; 11. Side plate; 12. Clearance opening. Detailed Implementation

[0019] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] In the description of the embodiments of this application, the technical terms "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, 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 the embodiments of this application.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] refer to Figures 1 to 4 This application provides a POS machine, including a front shell 1 and a bottom shell 2 connected together. A printer assembly 3 and a control circuit board 4 are mounted on the front shell 1. The printer assembly 3 is provided with a first electrical connection part 310, and the control circuit board 4 is provided with a second electrical connection part 410 spaced apart from the first electrical connection part 310. The bottom shell 2 is provided with a third electrical connection part 210. The bottom shell 2 and the front shell 1 are aligned so that the third electrical connection part 210 is connected to the first electrical connection part 310 and the second electrical connection part 410.

[0028] Specifically, the control circuit board 4 of the POS machine is electrically connected to the printer assembly 3 to achieve bidirectional communication of data commands and status information. The control circuit board 4 has a central processing unit or a dedicated printing control chip for controlling the printer assembly 3. The control circuit board 4 converts the content to be printed (such as product name, quantity, price, total amount, time, transaction number, etc.) into data commands and sends them to the printer assembly 3 to realize the printing function of the POS machine. The printer assembly 3 feeds back the status signals of its internal sensors (such as "paper-out sensor signal", "print head temperature too high signal" or "cutter position signal") to the control circuit board 4 in real time through the same channel, thereby realizing functional coordination and system status monitoring.

[0029] Understandably, the control circuit board 4 and the printer assembly 3 are arranged at intervals within the housing 1, thus requiring a circuit connection structure between them. Existing solutions typically involve connecting conductive elements to the housing 1, with one end electrically connected to the printer assembly 3 and the other end electrically connected to contacts on the control circuit board 4. However, during disassembly, the operator must manually disconnect the conductive elements between the printer assembly 3 and the control circuit board 4. This process is highly susceptible to damage due to improper handling, such as pulling on the conductive elements, causing them to break, crack, or damaging their original assembly, thus affecting telecommunication conductivity.

[0030] In this embodiment of the POS machine, a first electrical connection part 310 is provided on the printer assembly 3, and a second electrical connection part 410 spaced apart from the first electrical connection part 310 is provided on the control circuit board 4. By providing a third electrical connection part 210 on the bottom shell 2, after the front shell 1 and the bottom shell 2 are mechanically joined together, the third electrical connection part 210 on the bottom shell 2 can be connected between the first electrical connection part 310 and the second electrical connection part 410. The joining action of the front shell 1 and the bottom shell 2 will automatically realize the electrical conduction between the printer assembly 3 and the control circuit board 4. When disassembling the machine, the separation action of the front shell 1 and the bottom shell 2 will automatically release the conduction state between the printer assembly 3 and the control circuit board 4. The third electrical connection part 210 leaves the front shell 1 with the bottom shell 2, without affecting the subsequent disassembly steps. The operator does not need to touch the first electrical connection part 310, the second connection part 410 and the third connection part 210, realizing "non-contact" disconnection and physically avoiding the possibility of human damage.

[0031] Furthermore, when the machine is disassembled and reassembled, simply aligning the front cover 1 with the bottom cover 2 will automatically and reliably restore the electrical connection between the printer assembly 3 and the control circuit board 4, eliminating the need for any manual alignment or plugging / unplugging operations. This avoids mechanical damage and electrical faults to the electrical connection structure caused by disassembly and reassembly, thus improving the maintainability and reliability of the product.

[0032] refer to Figure 2 and Figure 3 In some embodiments, the front shell 1 has a receiving space 110, and the printer assembly is disposed in the receiving space 110; the bottom shell 2 has a raised portion 5 protruding towards the front shell 1, and a third connecting portion 210 is disposed on the end face of the raised portion 5 facing the front shell 1; the raised portion 5 is embedded in the receiving space 110, so that the two ends of the third electrical connecting portion 210 are respectively pressed against the first electrical connecting portion 310 and the second electrical connecting portion 410.

[0033] Specifically, the receiving space 1 on the front shell 1 provides a space for accommodating and positioning the printer assembly 3, and a corresponding protrusion 5 is formed on the bottom shell 2. The protrusion 5 can be embedded in the receiving space 1 to achieve mechanical positioning of the front shell 1 and the bottom shell 2, so that the front shell 1 and the bottom shell 2 can be quickly and accurately aligned when the lid is closed to prevent misalignment; and the printer assembly 3 is precisely constrained within the receiving space 110.

[0034] It should be noted that the raised part 5 is a structure of the bottom shell 2 itself. The bottom shell 2 is usually provided with a battery compartment or paper compartment structure, which forms the raised part 5. The raised part 5 is embedded in the accommodating space 110, improving the space utilization of the POS machine.

[0035] By adopting the above technical solution, utilizing the structure of the bottom shell 2, the third electrical connection part 410 is disposed on the end face of the raised part 5. When the raised part 5 is embedded in the accommodating space 1, the two ends of the third electrical connection part 210 can be pressed against the first electrical connection part 310 and the second electrical connection part 410 to achieve electrical contact connection, so that the printer assembly 3 and the control circuit board 4 can conduct electricity. Moreover, the raised part 5 is a rigid structure, which can stably support the third electrical connection part 210, so that the contact pressure between the third electrical connection part 210 and the first electrical connection part 310 and the second electrical connection part 410 is uniform, thereby improving the vibration resistance and impact resistance of the telecommunication conduction structure.

[0036] refer to Figure 3 and Figure 4 In some embodiments, the third electrical connection portion 210 is flexible and is attached to the raised portion 5.

[0037] The raised portion 5 in this embodiment has an arc-shaped end face, and the third electrical connection portion 210 is flexible and can be bent to fit tightly against the arc-shaped end face, making connection convenient; the raised portion 5 can provide stable rigid support for the third electrical connection portion 210.

[0038] In some embodiments, the third electrical connection portion 210 is a strip of conductive cloth.

[0039] Specifically, the conductive cloth is conductive and is made of woven fibers. It is soft, compressible and resilient. It can be bent, folded and crumpled without breaking easily. It is easy to process into various shapes and can fit tightly onto the end face of the raised part 5.

[0040] By combining the conductive cloth with the rigid support of the raised part 5, the small assembly tolerance between the front shell 1 and the bottom shell 2 can be compensated, ensuring that the electrical contact interface between the conductive cloth and the first conductive element 6 and the electrical contact interface with the second conductive element 7 can maintain stable and continuous pressure, with small changes in contact resistance, avoiding connection interruption caused by vibration or impact, and improving the stability of the telecommunications channel.

[0041] For example, the connection between the third electrical connection part 210 and the raised part 5 can be, but is not limited to, bonding, heat fusion, screw connection, snap-fit, etc., as long as the second conductive part 210 and the raised part 5 are tightly fitted.

[0042] refer to Figures 2 to 4 In some embodiments, the first electrical connection portion 310 includes a first conductive element 6 electrically connected to the printer assembly 3.

[0043] Specifically, the printer assembly 3 has a drive motor 320, which drives the paper feed roller to precisely control the distance the printing paper moves. Utilizing the stable operation of the drive motor 320 to achieve clear, neat, and efficient printing is a conventional design in the prior art, and this application will not elaborate on it further. The drive motor 320 has an electrical connection interface, and a first conductive element 6 is disposed at the electrical connection interface for electrical connection with the drive motor 320.

[0044] Specifically, the first conductive element 6 is conductive foam, which is a high-performance material that combines conductivity and elasticity. The face shell 1 and the bottom shell 2 are mated so that one end of the third electrical connection part 210 is pressed against the first conductive element 6. The first conductive element 6 can be compressed adaptively to make close contact with the third electrical connection part 210, ensuring a stable and reliable electrical contact with the third electrical connection part 210. This effectively reduces the precision requirements for the electrical contact fit of the parts.

[0045] The first conductive element 6 can provide full-plane contact, achieving surface contact with the third electrical connection portion 210, thus improving the stability of the electrical connection. In addition, the first conductive element 6 is elastic, which can absorb and buffer shocks and vibrations, ensuring the continuity of electrical contact in vibrating environments and preventing contact noise or momentary disconnection due to vibration.

[0046] For example, the first conductive element 6 can be easily stamped or die-cut into any desired size and shape. The first conductive element 6 can be attached to the drive motor 320 to adapt to various irregular and non-planar connection interfaces, simplifying the processing and assembly process.

[0047] refer to Figure 2 In some embodiments, the second conductive portion 410 includes a second conductive element 7 disposed in the accommodating space 110 and an extension 8 electrically connected between the second conductive element 7 and the control circuit board 4; the two ends of the third electrical connection portion 210 are respectively pressed onto the first conductive element 6 and the second conductive element 7.

[0048] Specifically, the second conductive element 7 is disposed in the accommodating space 110 and spaced apart from the first conductive element 6, so that after the bottom shell 2 and the top shell 1 are connected, the two ends of the third electrical connection part 210 can be pressed against the first conductive element 6 and the second conductive element 7 respectively.

[0049] The control circuit board 4 is provided with a connection contact point. One end of the extension 8 is electrically connected to the connection contact point, and the other end of the extension 8 is electrically connected to the second conductive element 7. The extension 8 realizes the electrical connection between the second conductive element 7 and the control circuit board 4.

[0050] Specifically, the second conductive element 7 is made of conductive foam, which is a high-performance material that combines conductivity and elasticity. The face shell 1 and the bottom shell 2 are mated so that the end of the third electrical connection part 210 is pressed against the second conductive element 7. The second conductive element 7 can be compressed adaptively to make close contact with the third electrical connection part 210, ensuring a stable and reliable electrical contact with the third electrical connection part 210. This effectively reduces the precision requirements for the electrical contact fit of the parts.

[0051] The second conductive element 7 can provide full-plane contact, achieving surface contact with the third electrical connection portion 210, thus improving the stability of the electrical connection. In addition, the second conductive element 7 is elastic, which can absorb and buffer shocks and vibrations, ensuring the continuity of electrical contact in vibrating environments and preventing contact noise or momentary disconnection due to vibration.

[0052] For example, the second conductive element 7 can be easily stamped or die-cut into any desired size and shape. The second conductive element 7 can be attached to the extension 8 to adapt to various irregular and non-planar connection interfaces, simplifying the processing and assembly process.

[0053] In some embodiments, the extension 8 is a strip of conductive cloth that is flexible and conductive, which is advantageous for placement between the second conductive element 7 and the control circuit board 4.

[0054] refer to Figure 2 In some embodiments, the faceplate 1 includes a faceplate body 100 and a mounting base 200 disposed at one end of the faceplate body 100; the control circuit board 4 is disposed on the faceplate body 100, and the head base 20 has a receiving space 110.

[0055] Specifically, the control circuit board 4 is mounted on the main body 100 of the casing. The control circuit board 4 integrates various interfaces and controllers for connecting and driving various devices that read payment information. In addition to controlling the printer assembly 3, the control circuit board 4 can also be used for functions such as magnetic stripe card reading, IC chip card reading, contactless payment (NFC / RFID), and QR code scanning.

[0056] refer to Figure 2 In some embodiments, the mounting base 200 includes a tray 9, a base plate 10 disposed on the side of the tray 9 away from the main body 100 of the face shell, and side plates 11 respectively connected to both sides of the connecting base plate 10. The tray 9, the base plate 10 and the side plates 11 on both sides enclose and form an accommodating space 110. The printer assembly 3 is disposed on the base plate 10, and the second conductive part 410 is located on the side of the tray 9 close to the main body 100 of the face shell.

[0057] Specifically, the printer assembly 3 is mounted on the base plate 10, spaced apart from the control circuit board 4. A first conductive element 6 is connected to the drive motor 320 of the printer assembly 3, and a second conductive element 7 is located on the side of the tray 9 near the panel body 100. The first conductive element 6 and the second conductive element 7 are then located on opposite sides of the tray 9. Other functional components of the POS machine (such as a display component) are integrated between the tray 9 and the control circuit board 4. Understandably, if the conductive element is directly placed between the printer assembly 3 and the control circuit board 4, the operator would need to manually disconnect the conductive element between the first conductive element 6 and the second conductive element 7 during disassembly, increasing the difficulty of disassembly and potentially damaging the original assembly integrity of the circuit connections.

[0058] This application provides a third electrical connection part 210 on the bottom shell 2. The separation action of the front shell 1 and the bottom shell 2 will automatically disconnect the first conductive element 6 and the second conductive element 7. The third electrical connection part 210 leaves the front shell 1 along with the bottom shell 2, without affecting the subsequent disassembly steps of the components between the printer assembly 3 and the control circuit board 4. Moreover, the operator does not need to contact the first conductive element 6 and the second conductive element 7, realizing "non-contact" disconnection and physically avoiding the possibility of human damage.

[0059] refer to Figure 2 and Figure 3 In some embodiments, the printer assembly 3 includes a drive motor 320, and the end face of the raised portion 5 is provided with a clearance opening 12 for avoiding the drive motor 320.

[0060] Specifically, the drive motor 320 is a cylindrical or square component with a certain height and volume, and it is a prominent part of the printer assembly 3. During installation, the raised portion 5 causes structural interference with the drive motor 320, preventing it from fully closing within the accommodating space 100, leaving gaps, and even potentially damaging the raised portion 5 and other precision components. Therefore, by providing a clearance opening 12 on the end face of the raised portion 5, physical space clearance is provided between the end face of the raised portion 5 and the drive motor 320, improving space utilization.

[0061] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A POS machine, characterized in that, include: A front shell and a bottom shell are joined together; a printer assembly and a control circuit board are mounted on the front shell, the printer assembly is provided with a first electrical connection part, and the control circuit board is provided with a second electrical connection part spaced apart from the first electrical connection part; a third electrical connection part is provided on the bottom shell, and the bottom shell and the front shell are joined together so that the third electrical connection part is connected to the first electrical connection part and the second electrical connection part.

2. The POS machine according to claim 1, characterized in that, The front shell has an accommodating space, and the printer assembly is disposed within the accommodating space; the bottom shell has a raised portion protruding towards the front shell, and the third connecting portion is disposed on the end face of the raised portion facing the front shell; the raised portion is embedded in the accommodating space, such that the two ends of the third electrical connecting portion are respectively pressed against the first electrical connecting portion and the second electrical connecting portion.

3. The POS machine according to claim 2, characterized in that, The third electrical connection is flexible and is attached to the raised portion.

4. The POS machine according to claim 3, characterized in that, The third electrical connection part is a strip of conductive cloth.

5. The POS machine according to claim 1, characterized in that, The first electrical connection includes a first conductive element electrically connected to the printer assembly.

6. The POS machine according to claim 5, characterized in that, The second conductive portion includes a second conductive element disposed in the accommodating space and an extension electrically connected between the second conductive element and the control circuit board; the two ends of the third electrical connection portion are respectively pressed onto the first conductive element and the second conductive element.

7. The POS machine according to claim 6, characterized in that, The first conductive element is made of conductive foam, and the second conductive element is made of conductive foam.

8. The POS machine according to any one of claims 1-7, characterized in that, The faceplate includes a faceplate body and a mounting base disposed at one end of the faceplate body; the control circuit board is disposed on the faceplate body, and the mounting base has the accommodating space.

9. The POS machine according to claim 8, characterized in that, The mounting base includes a tray, a base plate disposed on the side of the tray away from the main body of the face shell, and side plates respectively connected to both sides of the base plate; the tray, the base plate, and the side plates on both sides enclose the accommodating space; the printer assembly is disposed on the base plate, and the second conductive portion is located on the side of the tray closer to the main body of the face shell.

10. The POS machine according to claim 8, characterized in that, The printer assembly includes a drive motor, and the end face of the raised portion is provided with a clearance opening to avoid the drive motor.

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