Ink-jet printer

Abstract

The utility model provides an ink-jet printer, and relates to the technical field of ink-jet printers, the ink-jet printer comprises a housing, a carriage unit assembly, a moving assembly and a position detection device, the moving assembly comprises a first moving assembly and a second moving assembly, the first moving assembly is connected with the carriage unit assembly to drive the carriage unit assembly to move along an X-axis direction; the second moving assembly is connected with the first moving assembly so as to drive the carriage unit assembly to move in the Y-axis direction, and the first moving assembly and the second moving assembly are connected with the control device. And the position detection device is connected with the control device and is used for detecting the initial position of the carriage unit assembly on the shell, so that the technical problems that a handheld ink-jet printer in the prior art is unstable in movement, a carriage unit cannot be reset and the like are solved, and the technical effect of ensuring the stability and integrity of printing actions is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of inkjet printers, and in particular to an inkjet printer. Background Technology

[0002] Handheld inkjet printers are increasingly used in small and medium-sized production activities due to their advantages of small size and easy mobility.

[0003] The existing handheld inkjet printers are operated by the operator holding the machine and dragging it along the roller direction to print on the object. The print quality is affected by the stability of the operator's hand movement. Furthermore, if the cover for retrieving the ink cartridge is opened during the printing process, it can easily cause safety hazards. Also, if the inkjet printer's printhead carriage does not return to its initial position, it is difficult to determine the subsequent printing position. Utility Model Content

[0004] The purpose of this invention is to provide a coding machine that alleviates the technical problems of unstable movement and inability of the printing carriage to reset in existing handheld coding machines.

[0005] In a first aspect, this utility model provides a coding machine, comprising:

[0006] The casing is equipped with a control device;

[0007] The print head assembly is housed within the housing. The print head assembly includes a print head body and an ink cartridge. The print head body has a mounting cavity, the ink cartridge is located within the mounting cavity, and the ink cartridge is connected to the control device.

[0008] The moving device includes a first moving component and a second moving component. The first moving component is connected to a carriage assembly to drive the carriage assembly to move along the X-axis. The second moving component is connected to the first moving component to drive the carriage assembly to move along the Y-axis. The first moving component and the second moving component are respectively connected to a control device.

[0009] A position detection device, connected to the control device, is used to detect the initial position of the carriage assembly in the housing.

[0010] Optionally, the first movable component further includes a metal plate, which is detachably connected to the first movable component to accommodate printheads of different sized ink cartridges; the metal plate has an opening so that the printhead of the ink cartridge can protrude out of the opening.

[0011] Optionally, the letter carrier assembly also includes a positioning rod that connects to the mounting cavity.

[0012] Optionally, the mounting cavity is provided with a positioning groove, and the positioning rod is located in the positioning groove and is detachably connected to the positioning groove.

[0013] Optionally, the first moving component includes a first moving member, a first driving member, and a supporting member; the first moving member and the first driving member are respectively connected to the supporting member, the first moving member is respectively connected to the first driving member and the carriage assembly, and the first driving member is connected to the control device.

[0014] The second moving component includes a second moving member and a second driving member; the second moving member is connected to the support member and the second driving member respectively, and the second driving member is connected to the control device.

[0015] Optionally, the first moving component further includes a first guide rail, which is fixedly connected to the support member and slidably connected to the letter carrier component;

[0016] The second moving component also includes a second guide rail, which is fixedly connected to the bottom of the housing and slidably connected to the support.

[0017] Optionally, the position detection device includes a reset detection switch and a trigger. The reset detection switch is located on the inner wall of the housing, and the trigger is located on the carriage assembly. When the reset detection switch contacts the trigger, it is used to determine that the carriage assembly is in the initial position of the housing.

[0018] Optionally, the housing is provided with a cover for replacing the ink cartridge, and the cover is detachably connected to the housing.

[0019] Optionally, the housing is provided with an open cover detection switch, which is connected to the control device; the cover is provided with a trigger wall, which is connected to the open cover detection switch, for detecting the closed state of the cover.

[0020] Optionally, a scanning module is provided on the housing, and the scanning module is connected to the control device.

[0021] This utility model provides an inkjet printer that uses a moving component to drive the carriage assembly to move along the X and Y axes, increasing the printing area while ensuring the stability of the printing action. A position detection device detects whether the carriage assembly is in the initial position of the housing to prevent the carriage assembly from missing steps and affecting subsequent printing strokes, thereby avoiding incomplete printing or incorrect printing position. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an inkjet printer provided in an embodiment of this utility model;

[0024] Figure 2 A schematic diagram of the structure of the metal plate provided in an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of the positioning rod provided in an embodiment of this utility model;

[0026] Figure 4 A schematic diagram of the structure of a one-inch ink cartridge provided in an embodiment of this utility model;

[0027] Figure 5 A schematic diagram of the half-inch ink cartridge structure provided for an embodiment of this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the mobile component provided in an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the cover opening detection switch structure provided in an embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of the half-inch ink cartridge structure for the position detection switch provided in an embodiment of the present utility model.

[0031] Icons: 100-Housing; 110-Handheld part; 120-Scanning module; 130-Editable display screen; 200-Carriage assembly; 310-First moving assembly; 311-First moving component; 312-First guide rail; 313-Support component; 320-Second moving assembly; 321-Second moving component; 322-Second guide rail; 410-Metal plate; 412-Opening; 510-Positioning rod; 511-Mounting cavity; 600-One-inch ink cartridge; 610-Half-inch ink cartridge; 700-Opening cover; 710-Opening cover detection switch; 800-Reset detection switch; 810-Trigger component. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] Figure 1 A schematic diagram of the structure of an inkjet printer provided for this new embodiment of the utility model is shown below. Figure 1 As shown, the handheld inkjet printer includes at least: a housing 100, a carriage assembly 200, a moving device, and a position detection device. The housing 100 is equipped with a control device; the carriage assembly 200, located within the housing 100, includes a carriage body and an ink cartridge; the carriage body has a mounting cavity 511, and the ink cartridge is located within the mounting cavity 511 and connected to the control device; the moving device includes a first moving component 310 and a second moving component 320; the first moving component 310 is connected to the carriage assembly 200 to drive the carriage assembly 200 to move along the X-axis; the second moving component 320 is connected to the first moving component 310 to drive the carriage assembly 200 to move along the Y-axis; both the first and second moving components 310 are connected to the control device; and the position detection device, connected to the control device, is used to detect the initial position of the carriage assembly 200 within the housing 100.

[0035] Furthermore, the housing 100 is provided with a handheld part 110, one end of which is fixedly connected to the top of the housing 100, and a printing button for starting the inkjet printer is provided on the end face of the handheld part 110 near the housing 100. The printing button is connected to a control device. After receiving the start command sent by the printing button, the control device controls the carriage assembly 200, the moving device, and the position detection device to operate, thereby completing the inkjet printing.

[0036] In this embodiment, when marking the surface of an item with inkjet printing, the inkjet printer is positioned on the surface of the item. The inkjet printer is started manually, and the position detection device determines whether the carriage is in the initial position. If so, the control device controls the moving component to move the carriage component 200 to the designated position according to the marking requirements. Specifically, the first moving component 310 is controlled to move the carriage along the X-axis, and the second moving component 320 is controlled to move the carriage along the Y-axis, so that the carriage component 200 is moved to the initial position where the item surface needs to be marked with inkjet printing. Then, the control device controls the carriage component 200 to perform inkjet printing on the object surface, thereby completing the marking of the item surface with inkjet printing.

[0037] The moving component drives the carriage assembly 200 to move along the X and Y axes, increasing its printing area while ensuring the stability of the printing action. The position detection device detects whether the carriage assembly 200 is in the initial position of the housing 100 to prevent the carriage assembly 200 from missing steps and affecting subsequent printing strokes, thereby avoiding incomplete printing or incorrect printing position.

[0038] In an optional embodiment, the first moving component 310 further includes a metal plate 410, which is detachably connected to the first moving component 310 to accommodate printheads of ink cartridges of different sizes; the metal plate is provided with an opening 412 so that the printhead of the ink cartridge can protrude out of the opening 412.

[0039] In this embodiment of the application, the first moving component 310 is provided with an opening for accommodating the ink cartridge printhead. The area of ​​the opening is larger than the size of the ink cartridge printhead, and a metal plate 410 is provided at the opening. The opening 412 on the metal plate 410 is adapted to the size of the ink cartridge printhead installed in the printhead assembly 200.

[0040] For example, such as Figure 2 As shown, when a half-inch ink cartridge 610 printhead is installed in the printhead assembly 200, the metal plate 410 on the support 313 is replaced with a metal plate 410 with a half-inch opening 412 that is compatible with the half-inch ink cartridge 610 printhead; when a one-inch ink cartridge 600 printhead is installed in the printhead assembly 200, the metal plate 410 on the support 313 is replaced with a metal plate 410 with a one-inch opening 412 that is compatible with the one-inch ink cartridge 600 printhead. By replacing the metal plate 410, the inkjet printer can be adapted to ink cartridge printheads of different sizes.

[0041] Furthermore, the metal plate 410 can be fixedly connected to the support member 313 by screws or clips.

[0042] In an optional embodiment, the letter carrier assembly 200 further includes a positioning rod 510, which is connected to the mounting cavity 511. The mounting cavity 511 is provided with a positioning groove, and the positioning rod 510 is disposed in the positioning groove and detachably connected to the positioning groove.

[0043] like Figure 3 As shown in the embodiment of this application, the size of the mounting cavity 511 is large enough to accommodate the largest ink cartridge printhead. If it is necessary to install ink cartridge printheads of other sizes, the ink cartridge printhead is fixed in the mounting cavity 511 by the positioning rod 510, thereby realizing the switching of ink cartridge printheads.

[0044] In this application, the ink cartridge printheads are configured in two types: one is the 610 printhead for half-inch ink cartridges, and the other is the 600 printhead for one-inch ink cartridges. For example... Figure 4 As shown, when the ink cartridge printhead is a 1-inch ink cartridge 600 printhead, simply install the 1-inch ink cartridge 600 printhead into the mounting cavity 511. Figure 5 As shown, when the ink cartridge printhead is a half-inch ink cartridge 610 printhead, the half-inch ink cartridge 610 printhead is installed into the mounting cavity 511, and the positioning rod 510 is installed into the positioning groove so that the positioning rod 510 fixes the half-inch module printhead in the mounting cavity 511.

[0045] In an optional embodiment, the first moving component 310 includes a first moving member 311, a first driving member, and a support member 313; the first moving member 311 and the first driving member are respectively connected to the support member 313, the first moving member 311 is respectively connected to the first driving member and the carriage assembly 200, and the first driving member is connected to the control device.

[0046] The second moving component 320 includes a second moving member 321 and a second driving member; the second moving member 321 is connected to the support member 313 and the second driving member respectively, and the second driving member is connected to the control device.

[0047] In this embodiment of the application, the structures of the first moving component 310 and the second moving component 320 may be the same or different. The first moving component 310 and / or the second moving component 320 may adopt a lead screw and nut mechanism, a cylinder or hydraulic cylinder structure, or a telescopic rod structure or other mechanisms that can realize linear motion.

[0048] Specifically, such as Figure 6 As shown, in this application, the first moving member 311 can adopt a belt structure, and the first driving member can adopt a stepper motor structure to realize the movement of the carriage assembly 200 along the X-axis and / or Y-axis. The first belt structure includes a driving pulley, a driven pulley, and a belt. The belt is sleeved on the outside of the driving pulley and the driven pulley. The driving pulley and the driven pulley are located on the same plane and have a certain distance between them.

[0049] Both the first moving component 310 and the second moving component 320 further include a tensioning unit, which includes a tensioning wheel and a tensioning wheel bracket. The tensioning wheel is connected to the driven wheel of the first moving component 311 or the second moving component 321 through the tensioning wheel bracket to ensure that the belt is always in the required tension state.

[0050] The stepper motor is connected to the drive wheel, and the carriage assembly 200 is connected to the belt through a connector. The stepper motor drives the drive wheel to move, thereby causing the belt to drive the carriage assembly 200 to move along the X-axis.

[0051] Furthermore, the control device in this application is a PCBA controller, and the stepper motor is connected to the PCBA controller. The PCBA controller controls the stepper motor to make the carriage assembly 200 move on the X-axis / Y-axis and perform printing operations.

[0052] In one optional embodiment, the housing 100 is provided with a cover 700 for replacing ink cartridges. The cover 700 is detachably connected to the housing 100, and the housing 100 is provided with a cover opening detection switch 710, which is connected to a control device. The cover 700 is provided with a trigger wall, which is connected to the cover opening detection switch 710, for detecting the closed state of the cover 700.

[0053] To prevent the cover 700 from being opened by the user when replacing the ink cartridge while the ink cartridge is in operation, thus increasing the safety hazard, a cover opening detection switch 710 is installed at the cover 700.

[0054] like Figure 7 As shown, the cover opening detection switch 710 is located in the housing 100, and the cover opening detection switch 710 is provided with a spring. The side of the cover 700 facing the housing 100 is provided with a trigger arm for contacting the spring. The cover opening detection switch 710 is connected to the control device. When the cover 700 is in the closed state, the end of the trigger arm away from the cover 700 abuts against the spring, and the cover opening detection switch 710 sends a signal that the cover 700 is closed to the control device. When the cover 700 is in the open state, the end of the trigger arm away from the cover 700 does not abut against the spring, and the cover opening detection switch 710 sends a signal that the cover 700 is open to the control device. After receiving the signal that the cover 700 is open, the control device controls the ink cartridge to stop printing and controls the movement of the moving component so that the print head assembly 200 moves to the initial position along the X and Y axes, thereby preventing safety hazards such as collisions and facilitating the storage and retrieval of the ink cartridge.

[0055] In an optional embodiment, the first moving component 310 further includes a first guide rail 312, which is fixedly connected to the support member 313 and slidably connected to the letter carrier component 200.

[0056] The second moving component 320 also includes a second guide rail 322, which is fixedly connected to the bottom of the housing 100 and slidably connected to the support member 313.

[0057] To make its moving components more stable during operation, guide rails are provided to guide and limit the movement direction of the carriage component 200.

[0058] In this embodiment of the application, the length direction of the first guide rail 312 is the same as the length direction of the first moving member 311. One end of the first guide rail 312 is fixedly connected to the support member 313, and the other end is slidably connected to the letter carriage assembly 200 through the sliding member. When the first driving member drives the letter carriage assembly 200 to move, the letter carriage assembly 200 moves along the length direction of the first guide rail 312.

[0059] The length direction of the second guide rail 322 is the same as that of the second moving member 321. One end of the second rail is fixedly connected to the bottom surface of the housing 100, and the other end is slidably connected to the support member 313 of the first moving component 310 through a sliding member. When the second driving member drives the first moving component 310 to move, the first moving component 310 moves along the length direction of the second guide rail 322.

[0060] It should be noted that the length direction of the first guide rail 312 and the first moving member 311 is the X-axis direction; the length direction of the second guide rail 322 and the second moving member 321 is the Y-axis direction.

[0061] In one optional embodiment, the position detection device includes a reset detection switch 800 and a trigger 810. The reset detection switch 800 is disposed on the inner wall of the housing 100, and the trigger 810 is disposed on the carriage assembly 200. When the reset detection switch 800 contacts the trigger 810, it is determined that the carriage assembly 200 is in the initial position of the housing 100.

[0062] Furthermore, the trigger element 810 can be a trigger boss.

[0063] To prevent the carriage assembly 200 from failing to return to its initial position and thus hindering subsequent printing alignment, a position detection device is installed inside the housing 100. This device detects whether the carriage assembly 200 has returned to its initial position after printing is completed.

[0064] like Figure 8 As shown, the reset detection switch 800 of the position detection device is located on the inner wall of the housing 100, and the trigger 810 is located on the top of the printhead assembly 200. The reset detection switch 800 is connected to the control device. After printing is completed, the control device controls the moving component to move the printhead assembly 200 to the initial position. When the trigger 810 is connected to the reset detection switch 800, the reset detection switch 800 sends a signal to the control device that the printhead assembly 200 is in the initial position, and the control device controls the moving component to stop moving.

[0065] Furthermore, the initial position is that the carriage assembly 200 is located at the cover of the housing 100. After printing is completed, the carriage assembly 200 is moved to the initial position to facilitate the replacement of the ink cartridge.

[0066] In this application, after each power-on, the position detection device detects whether the carriage assembly 200 is in the initial position, and after printing is completed, the position detection device detects whether the carriage assembly 200 has returned to the initial position, thereby effectively preventing the carriage assembly 200 from losing steps and affecting subsequent printing travel, resulting in insufficient printing travel, inability to print complete content, or misalignment of the printed position.

[0067] In one optional embodiment, the housing 100 is provided with a scanning module 120, which is connected to a control device.

[0068] like Figure 1As shown, the scanning module 120 is located on the outer surface of the housing 100 and is used to read the markings to be printed by the inkjet printer, such as QR codes and / or barcodes. In this application, the scanning module 120 includes a camera, an image sensor, and several lenses. The camera acquires the markings and uses the lens to focus the light onto the photosensitive chip of the image sensor. After receiving the light signal, the photosensitive chip converts the image signal into an electrical signal using CMOS (Complementary Metal-Oxide-Semiconductor) technology, obtains the image signal, and uses an image processing algorithm to recognize and process the image signal to obtain the QR code and / or barcode area. The image processing algorithm can recognize the QR code and / or barcode by searching for specific patterns in the image, edge detection, grayscale transformation, etc. Then, the decoder decodes the recognized QR code and / or barcode, converts the QR code and / or barcode information into readable string information, and sends the string content to the control device.

[0069] After receiving the string sent by the scanning module, the control device decodes it using a decoding algorithm to obtain the QR code and / or barcode area.

[0070] In one optional embodiment, the housing 100 is provided with an editable display screen 130. The decoded QR code and / or barcode is edited and converted into an image format through the editable display screen 130. The image is then rendered into 1-bit 1-pixel image data required by the printhead according to the printhead size, and then sent to the nozzle of the printhead assembly 200 in a single-column data manner.

[0071] In this embodiment of the application, the inkjet printer performs the inkjet printing process as follows:

[0072] First, determine whether the ink cartridge of the inkjet printer needs to be replaced. If so, the ink cartridge and metal plate need to be replaced after opening the cover.

[0073] Secondly, the scanning device acquires the identification information to be printed and sends the identification information to the control device;

[0074] Then, the control device generates the image data information required by the ink cartridge printhead based on the identification information and the ink cartridge printhead specifications;

[0075] Finally, the position detection device detects whether the letter carriage assembly is in the initial position. If so, the control device controls the movement of the moving component and the letter carriage assembly according to the image data information to mark the item with inkjet printing. After the inkjet printing is completed, the moving component is controlled to move the letter carriage assembly to the initial position.

[0076] Then, the position detection device detects whether the carriage assembly has returned to its initial position. If so, the control device controls the moving assembly to stop moving.

[0077] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0078] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0079] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0080] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An inkjet printer characterized by comprising: The application relates to a printer, which comprises a shell, a control device, a carriage assembly, a moving device, a position detection device and a scanning module. The shell is provided with the control device. The carriage assembly is arranged in the shell and comprises a carriage body and an ink cartridge. The carriage body is provided with a mounting cavity, and the ink cartridge is arranged in the mounting cavity. The ink cartridge is connected with the control device. The moving device comprises a first moving assembly and a second moving assembly.

2. The inkjet printer according to claim 1, characterized in that, The first moving assembly is connected with the carriage assembly to drive the carriage assembly to move along an X-axis direction. The second moving assembly is connected with the first moving assembly to drive the carriage assembly to move along a Y-axis direction.

3. The inkjet printer of claim 1, wherein The first moving assembly and the second moving assembly are respectively connected with the control device.

4. The inkjet printer of claim 3, wherein The position detection device is connected with the control device and is used for detecting the initial position of the carriage assembly in the shell.

5. The inkjet printer of claim 1, wherein The first moving assembly further comprises a metal plate which is detachably connected with the first moving assembly to adapt to the nozzle of the ink cartridge with different sizes. An opening is arranged on the metal plate to enable the nozzle of the ink cartridge to protrude out of the opening.

6. The inkjet printer of claim 5, wherein The carriage assembly further comprises a positioning rod which is connected with the mounting cavity. A positioning groove is arranged on the mounting cavity, and the positioning rod is arranged in the positioning groove and is detachably connected with the positioning groove.

7. The inkjet printer of claim 1, wherein The first moving assembly comprises a first moving piece, a first driving piece and a support piece.

8. The inkjet printer of claim 1, wherein, The first moving piece and the first driving piece are respectively connected with the support piece.

9. The inkjet printer of claim 8, wherein, The first moving piece is respectively connected with the first driving piece and the carriage assembly.

10. The inkjet printer of claim 1, wherein, The first driving piece is connected with the control device. The second moving assembly comprises a second moving piece and a second driving piece. The second moving piece is respectively connected with the support piece and the second driving piece. The second driving piece is connected with the control device. The first moving assembly further comprises a first guide rail which is fixedly connected with the support piece and is slidably connected with the carriage assembly. The second moving assembly further comprises a second guide rail which is fixedly connected with the bottom of the shell and is slidably connected with the support piece. The position detection device comprises a reset detection switch and a trigger piece. The reset detection switch is arranged on the inner wall of the shell. The trigger piece is arranged on the carriage assembly. When the reset detection switch contacts with the trigger piece, the initial position of the carriage assembly in the shell is determined. The shell is provided with an opening cover for replacing the ink cartridge. The opening cover is detachably connected with the shell. The shell is provided with an opening cover detection switch which is connected with the control device. The opening cover is provided with a trigger wall which is connected with the opening cover detection switch and is used for detecting the closing state of the opening cover. The shell is provided with a scanning module which is connected with the control device.

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