A temporary license plate printing device

Abstract

The present invention discloses a temporary license plate printing device, comprising a conveying device and a printing device. The conveying device is provided with a paper feed channel, a transition channel, and a paper discharge channel in sequence according to the conveying direction of the printing substrate. The paper feed channel is arranged at an angle, and the paper discharge channel is arranged horizontally. A paper feed mechanism is provided between the paper feed channel and the transition channel, capable of bringing a printing substrate from the paper feed channel to the transition channel. A scanning mechanism is provided on the transition channel for scanning and identifying the authenticity of the printing substrate. A roller mechanism is provided between the transition channel and the paper discharge channel, capable of bringing the printing substrate from the transition channel to the paper discharge channel. A cleaning mechanism is provided on the paper discharge channel for cleaning the surface of the temporary license plate printing substrate. The present invention can prevent the use of counterfeit printing substrates for printing.

Description

Technical Field

[0001] The invention belongs to the technical field of printers, and in particular relates to a temporary license plate printing device. Background Art

[0002] Currently, before a new car is registered, a temporary license plate will be provided to the owner. The temporary license plate is made of paper and is placed in the car by the owner for use. Summary of the Invention

[0003] The present invention provides a temporary license plate printing device, comprising a conveying device and a printing device, wherein the conveying device is provided with a paper feed channel, a transition channel and a paper discharge channel in sequence according to the conveying direction of the printing substrate, the paper feed channel is arranged at an angle, and the paper discharge channel is arranged horizontally, a paper feeding mechanism is provided between the paper feed channel and the transition channel, which can bring a printing substrate from the paper feed channel to the transition channel, a scanning mechanism is provided on the transition channel for scanning and identifying the authenticity of the printing substrate, a roller mechanism is provided between the transition channel and the paper discharge channel, which can bring the printing substrate from the transition channel to the paper discharge channel, and a cleaning mechanism is provided on the paper discharge channel which can clean the surface of the printing substrate.

[0004] As a preferred solution of the present invention, the inclination angle of the paper feeding channel is 45 degrees to 65 degrees.

[0005] As a preferred embodiment of the present invention, the paper feed channel is provided with an entrance pallet and an introduction block on the side close to the transition channel, and the paper feed channel is provided with a plurality of supporting rollers on the side away from the transition channel. The entrance pallet and the supporting rollers both support the bottom surface of the printing substrate on the paper feed channel, and the introduction block is arranged on the side of the paper feed channel and above the entrance pallet, and the edge of the printing substrate passes between the introduction block and the entrance pallet; the introduction block is provided with an introduction slope on the side away from the transition channel.

[0006] As a preferred embodiment of the present invention, the paper pickup mechanism includes a first paper pressure roller, a paper pickup roller and a first driving unit for driving the paper pickup roller to rotate, the first paper pressure roller and the paper pickup roller are arranged opposite to each other in an upper and lower direction, and a first clamping channel is formed between the first paper pressure roller and the paper pickup roller, which can bring a printing substrate from the paper feed channel into the transition channel; the paper feed channel is provided with a first sensor on a side close to the transition channel, and the first sensor is electrically connected to the first driving unit; when the first sensor detects that the printing substrate is delivered to the entrance pallet, the system controls the first driving unit to turn on, drives the paper pickup roller to drive the printing substrate to the side of the transition channel.

[0007] As a preferred embodiment of the present invention, the scanning mechanism includes a scanning head and a second sensor, the scanning head is arranged above the transition channel, the second sensor is arranged on the side of the transition channel, and the second sensor is electrically connected to the scanning head. When the second sensor detects that the printing substrate is delivered to the position of the scanning head corresponding to the transition channel, the system controls the scanning head to turn on and scan the printing substrate. A unique QR code is provided on the printing substrate. When the scanning head scans the QR code, the system can automatically identify the QR code information and determine the authenticity of the printing substrate.

[0008] As a preferred embodiment of the present invention, a transition pallet and two anti-warping rollers are provided on the transition channel, the transition pallet supports the bottom surface of the printing substrate on the transition channel, the two anti-warping rollers are arranged in parallel on the front and rear sides of the transition pallet, the left and right ends of the anti-warping rollers are respectively rotatably connected to the transition pallet through roller seats, and the printing substrate passes between the anti-warping rollers and the transition pallet.

[0009] As a preferred embodiment of the present invention, a roller mechanism is provided between the transition channel and the paper output channel, the roller mechanism includes a second paper pressing wheel, a conveying roller and a second driving unit for driving the conveying roller to rotate, the second paper pressing wheel and the conveying roller are arranged opposite to each other in an upper and lower direction, and a second clamping channel is formed between the second paper pressing wheel and the conveying roller, which can bring the printed substrate from the transition channel into the paper output channel.

[0010] As a preferred embodiment of the present invention, the cleaning mechanism includes an upper cleaning roller, a lower roller and a cleaning cotton wheel, the upper cleaning roller and the lower roller are arranged relative to each other in an upper and lower direction, the printing substrate passes between the upper cleaning roller and the lower roller, the cleaning cotton wheel is arranged above the upper cleaning roller and in contact with the upper cleaning roller, the outer surface of the upper cleaning roller is provided with a rubber adhesion layer, and the outer surface of the cleaning cotton wheel is provided with double-sided tape.

[0011] As a preferred embodiment of the present invention, the paper feed channel is provided with an entrance limit block on the side close to the transition channel for preventing the printing substrate from swinging left and right; the paper discharge channel is provided with an exit limit block on the side close to the printing device for preventing the printing substrate from swinging left and right.

[0012] As a preferred embodiment of the present invention, the printing device includes a printing channel connected to the paper output channel, a print head arranged above the printing channel, a print roller arranged at the end of the printing channel, and a carbon ribbon retracting mechanism for releasing and recycling the carbon ribbon. The printing channel is arranged horizontally, and the top of the print roller is located on the same horizontal plane as the printing channel. The print head is an end print head, and the printing end face of the print head is opposite to the top of the print roller. The printing end face of the print head is embedded with a heating wire. The width of the contact between the printing end face of the print head and the printing substrate is 0.3mm~0.4mm. The two side faces connected to the front and back sides of the printing end face of the print head respectively form an angle with the horizontal plane where the printing channel is located. The printing end face of the print head is coated with a wear-resistant coating. The printing device is electrically connected to a third sensor, and the third sensor is arranged on the printing channel. When the third sensor detects that the printing substrate is delivered to the printing channel, the system controls the printing device to start and print on the printing substrate.

[0013] The temporary license plate printing device provided by the present invention has the following advantages compared with the prior art:

[0014] (1) The present invention designs the paper feed channel to feed paper at an angle, which can shorten the length of the printer and reduce the space occupied by the desk;

[0015] (2) The present invention is capable of scanning and identifying the authenticity of a printing substrate by setting up a scanning mechanism, thereby preventing the use of a fake printing substrate for printing;

[0016] (3) The present invention provides a cleaning mechanism to remove dust from the surface (i.e., the printing surface) of the printing substrate before it enters the printing device, thereby ensuring the printing quality of the temporary license plate;

[0017] (4) The present invention achieves a smooth transition between the paper feed channel and the paper discharge channel through the design of the transition channel, thereby preventing the printing substrate from being damaged by excessive bending. At the same time, it provides installation space for the scanning mechanism, further reducing the space occupied by the desk;

[0018] (5) The present invention provides inclined conveying power and horizontal conveying power for the printing substrate by setting up a paper pickup mechanism and a roller mechanism, respectively, so that the printing substrate can smoothly switch from an inclined moving state to a horizontal moving state, thereby ensuring the stability of the printing substrate conveyance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0020] Figure 1 It is a structural schematic diagram of a temporary license plate printing device provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the conveying device, paper picking mechanism, scanning mechanism, roller mechanism and cleaning mechanism (1);

[0022] Figure 3 It is a schematic diagram of the structure of the conveying device, paper picking mechanism, scanning mechanism, roller mechanism and cleaning mechanism (II);

[0023] Figure 4 It is a schematic structural diagram of a printing device;

[0024] Figure 5 It is Figure 4 Installation layout diagram of the end face print head and print roller in the structure shown;

[0025] Figure 6 This is an installation layout diagram of an existing flat print head and print roller.

[0026] Markings in the figure:

[0027] 1. Conveying device, 11. Paper feed channel, 12. Transition channel, 13. Paper output channel, 14. Entrance support plate, 15. Inlet block, 16. Support roller, 17. Transition support plate, 18. Anti-warping roller, 19a. Entrance limit block, 19b. Exit limit block;

[0028] 2. Printing device, 21. Printing channel, 22. Print head, 23. Print roller, 24. Carbon ribbon retracting and releasing mechanism, 25. Carbon ribbon, 26. Third sensor, 27. Printing end surface;

[0029] 3. Printing substrate;

[0030] 4. Paper pickup mechanism, 41. First paper pressing roller, 42. Paper pickup roller, 43. First sensor;

[0031] 5. Scanning mechanism, 51. Scanning head, 52. Second sensor;

[0032] 6. Roller mechanism, 61. Second paper pressing roller, 62. Transport roller;

[0033] 7. Cleaning mechanism, 71. Upper cleaning roller, 72. Lower roller, 73. Cleaning cotton wheel. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the machine or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but such information should not be limited to these terms, which are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0036] like Figures 1 to 5 As shown, a temporary license plate printing device according to a preferred embodiment of the present invention includes a conveying device 1 and a printing device 2. The conveying device 1 is provided with a paper feed channel 11, a transition channel 12, and a paper discharge channel 13 in sequence according to the conveying direction of the printing substrate 3. The paper feed channel 11 is arranged at an angle, and the paper discharge channel 13 is arranged horizontally. A paper feeding mechanism 4 is provided between the paper feed channel 11 and the transition channel 12, which can bring a printing substrate 3 from the paper feed channel 11 to the transition channel 12. A scanning mechanism 5 is provided on the transition channel 12 for scanning and identifying the authenticity of the printing substrate 3. A roller mechanism 6 is provided between the transition channel 12 and the paper discharge channel 13, which can bring the printing substrate 3 from the transition channel 12 to the paper discharge channel 13. A cleaning mechanism 7 is provided on the paper discharge channel 13 for cleaning the surface of the printing substrate 3.

[0037] Thus, the key features of a temporary license plate printing device provided by an embodiment of the present invention are as follows: first, the paper feed channel 11 is designed to feed paper at an angle, which can reduce the length of the printer and reduce the space occupied on the desk; second, the provision of a scanning mechanism 5 can scan and identify the authenticity of the printing substrate 3, thereby preventing the use of fake printing substrates 3 for printing; third, the provision of a cleaning mechanism 7 clears dust from the surface (i.e., the printing surface) of the printing substrate 3 before it enters the printing device 2, thereby ensuring the printing quality of the temporary license plate; fourth, the design of the transition channel 12 ensures a smooth transition between the paper feed channel 11 and the paper discharge channel 13, preventing the printing substrate 3 from being damaged by excessive bending, while also providing installation space for the scanning mechanism 5, further reducing the space occupied on the desk; finally, the provision of a paper pickup mechanism 4 and a roller mechanism 6 respectively provide inclined and horizontal conveying power for the printing substrate 3, enabling the printing substrate 3 to smoothly transition from an inclined movement state to a horizontal movement state, thereby ensuring the stability of the conveyance of the printing substrate 3.

[0038] Exemplarily, the inclination angle of the paper feed channel 11 is preferably 45 degrees to 65 degrees. This inclination angle enables the printing substrate 3 to slide to the paper feed side of the paper pickup mechanism 4 under its own weight, while avoiding the problem of excessive bending of the printing substrate 3 and resulting in damage when the inclination angle is too large.

[0039] Exemplarily, to ensure the straight feeding of the printing substrate, the paper feed channel 11 is provided with an entrance support plate 14 and an introduction block 15 on the side near the transition channel 12. The entrance support plate 14 supports the bottom surface of the printing substrate 3 on the paper feed channel 11. The introduction block 15 is provided on the side (specifically, the side wall) of the paper feed channel 11 and above the entrance support plate 14. The edge of the printing substrate 3 passes between the introduction block 15 and the entrance support plate 14. The paper feed channel 11 is provided with a plurality of support rollers 16 on the side away from the transition channel 12. The support rollers 16 support the bottom surface of the printing substrate 3 on the paper feed channel 11. The design of the support rollers 16 can reduce the resistance of the paper feed channel 11 to the printing substrate 3, facilitating the sliding of the printing substrate 3 under its own weight. Furthermore, the introduction block 15 is provided with an introduction slope on the side away from the transition channel 12. This introduction slope facilitates the insertion of the edge of the printing substrate 3 between the introduction block 15 and the entrance support plate 14.

[0040] Illustratively, the pickup mechanism 4 includes a first pressure roller 41, a pickup roller 42, and a first drive unit for rotating the pickup roller 42. The first pressure roller 41 and the pickup roller 42 are disposed in a vertically opposed relationship, forming a first pinching channel between the first pressure roller 41 and the pickup roller 42, capable of conveying a sheet of printing substrate 3 from the paper feed channel 11 into the transition channel 12. The first pressure roller 41 has a certain amount of displacement space, allowing it to move closer to or further away from the pickup roller 42. A spring acts on the first pressure roller 41 to press against the pickup roller 42 or the printing substrate 3. Consequently, when the first drive unit drives the pickup roller 42 to rotate, a bite force is generated between the first pressure roller 41 and the pickup roller 42, conveying the printing substrate 3 from the paper feed channel 11 into the transition channel 12.

[0041] Furthermore, the paper feed channel 11 is provided with a first sensor 43 on a side near the transition channel 12. The first sensor 43 is disposed on the entrance support plate 14 and is electrically connected to the first drive unit. When the first sensor 43 detects that the printing substrate 3 has been delivered to the entrance support plate 14, the system controls the first drive unit to start, driving the pickup roller 42 to convey the printing substrate 3 toward the transition channel 12. Thus, the provision of the first sensor 43 can control the start and stop of the first drive unit, effectively preventing the first drive unit from operating inefficiently and saving energy.

[0042] Exemplarily, the scanning mechanism 5 includes a scanning head 51 and a second sensor 52. The scanning head 51 is positioned above the transition passage 12, while the second sensor 52 is positioned to the side of the transition passage 12 and electrically connected to the scanning head 51. When the second sensor 52 detects that the printing substrate 3 has reached the position corresponding to the scanning head 51 in the transition passage 12, the system controls the scanning head 51 to start scanning the printing substrate 3. The printing substrate 3 is provided with a unique QR code. When the scanning head 51 scans the QR code, the system automatically identifies the QR code information and determines the authenticity of the printing substrate 3. If the printing substrate 3 is determined to be authentic, the temporary license plate requested by the applicant is printed. If the printing substrate 3 is determined to be counterfeit, printing is stopped and an error message is issued. It should also be noted that the second sensor 52 can control the start and stop of the scanning head 51, effectively preventing inefficient operation of the scanning head 51 and saving energy.

[0043] Exemplarily, the transition channel 12 is provided with a transition support plate 17 and two anti-warping rollers 18. The transition support plate 17 supports the bottom surface of the printing substrate 3 on the transition channel 12. The two anti-warping rollers 18 are arranged parallel to the front and rear sides of the transition support plate 17. The left and right ends of the anti-warping rollers 18 are rotatably connected to the transition support plate 17 via roller seats. The printing substrate 3 passes between the anti-warping rollers 18 and the transition channel 17. This design ensures that the printing substrate 3 is conveyed straight on the transition channel 12, preventing the printing substrate 3 from warping. This facilitates accurate detection and positioning by the second sensor 52 and facilitates the scanning head 51 to scan the QR code on the printing substrate 3.

[0044] Illustratively, a roller mechanism 6 is provided between the transition passage 12 and the paper exit passage 13. The roller mechanism 6 includes a second pinch roller 61, a feed roller 62, and a second drive unit for rotating the feed roller 62. The second pinch roller 61 and the feed roller 62 are disposed in a vertically opposed relationship, forming a second pinching channel between the second pinch roller 61 and the feed roller 62 that can carry the printed substrate 3 from the transition passage 12 into the paper exit passage 13. The second pinch roller 61 has a certain amount of displacement space, allowing it to move closer to or further away from the feed roller 62. A spring acts to press against the feed roller 62 or the printed substrate 3. Consequently, when the second drive unit drives the feed roller 62 to rotate, a bite force is generated between the second pinch roller 61 and the feed roller 62, carrying the printed substrate 3 from the transition passage 12 into the paper exit passage 13.

[0045] It should be noted that the first driving unit and the second driving unit of this embodiment are the same driving unit, and the pickup roller 42 and the conveying roller 62 are caused to rotate synchronously through a gear transmission mechanism.

[0046] Illustratively, the cleaning mechanism 7 includes an upper cleaning roller 71, a lower roller 72, and a cleaning cotton wheel 73. The upper cleaning roller 71 and the lower roller 72 are arranged in a vertically opposed relationship, with the printing substrate 3 passing between the upper cleaning roller 71 and the lower roller 72. The cleaning cotton wheel 73 is arranged above and in contact with the upper cleaning roller 71. The outer surface of the upper cleaning roller 71 is provided with a rubber adhesive layer, and the outer surface of the cleaning cotton wheel 73 is provided with double-sided tape. The design of the lower roller 72 can reduce the resistance of the paper output channel 13 to the printing substrate 3. The upper cleaning roller 71 has a certain displacement space, allowing it to move closer to or further away from the lower roller 72. The upper cleaning roller 71 is spring-loaded to press against the lower roller 72 or the printing substrate 3. Therefore, when the printing substrate 3 passes between the upper cleaning roller 71 and the lower roller 72, the printing substrate 3 can drive the upper cleaning roller 71 to rotate, and the rubber adhesive layer on the upper cleaning roller 71 can adhere to the dust on the surface of the printing substrate 3 (i.e., the printing surface). When the upper cleaning roller 71 rotates to contact the cleaning cotton wheel 73, since the surface of the cleaning cotton wheel 73 is made of double-sided tape, it can effectively stick to the dust on the upper cleaning roller 71 and prevent it from falling off, thereby achieving the cleaning of the dust on the surface of the printing substrate 3.

[0047] It should be noted that, considering that when the surface of the cleaning cotton wheel 73 is covered with dust, the dust removal effect will be very poor, and the cleaning cotton wheel needs to be replaced in time, the cleaning cotton wheel 73 preferably adopts an easy-to-assemble and disassemble structure for easy replacement.

[0048] For example, an entrance stopper 19a is provided on the side of the paper feed channel 11 near the transition channel 12 to prevent the printing substrate 3 from swaying left or right. The entrance stopper 19a is connected to the side of the paper feed channel 11 via a spring and is positioned opposite the guide block 15. Consequently, the spring forces the entrance stopper 19a to press the printing substrate 3 against the sidewall on the other side of the paper feed channel 11, thereby preventing the printing substrate 3 from swaying left or right during transport and improving printing accuracy.

[0049] For example, the paper exit passage 13 is provided with an exit stopper 19b on the side near the printing device 2 to prevent the printed substrate 3 from swaying left or right. The exit stopper 19b is connected to the side of the paper exit passage 13 via a spring. Consequently, the exit stopper 19b, under the action of the spring, presses the printed substrate 3 against the sidewall on the other side of the paper exit passage 13, thereby preventing the printed substrate 3 from swaying left or right during transport and improving printing accuracy.

[0050] For example, since the existing flat print head has a certain angle with the paper path, and the printing plane of the flat print head has an adhesive for packaging electronic components (such as IC), the adhesive is raised and deviated from the top of the print roller (such as Figure 6 As shown in the figure, when printing on a hard and thick printing substrate (0.5mm-1.2mm), the adhesive portion will press against the printing substrate, causing it to bend. Furthermore, since the material of the printing substrate 3 (such as PC, PVC, or PET) is relatively hard, it is difficult for the heating wire of the print head to completely adhere to the printing surface of the printing substrate 3, thereby affecting the printing quality and resulting in unclear printing or the absence of fonts and images. Furthermore, the coating of existing print heads cannot withstand the scratches of the hard printing substrate 3, which can easily damage the print head. Therefore, the printing device 2 of this embodiment selects an end-face print head and changes the installation method of the print head and the print roller. Specifically, the printing device 2 includes a printing channel 21 connected to the paper output channel 13, a print head 22 arranged above the printing channel 21, a print roller 23 arranged at the end of the printing channel 21, and a carbon ribbon retracting mechanism 24 for releasing and recovering the carbon ribbon 25. The printing channel 21 is horizontally arranged, and the top of the print roller 23 is located on the same horizontal plane as the printing channel 21. The print head 22 is an end-face print head, and the printing end surface 27 of the print head 22 is opposite to the top of the print roller 23. The printing end surface 27 of the print head 22 is embedded with a heating wire. Therefore, by selecting an end-face print head and changing the installation method of the print head 22 and the print roller 23, the present invention can make the contact point between the print end face 27 of the print head 22 and the print substrate 3 exactly located at the top position of the print roller 23, so that the entire print substrate 3 can be printed and transported in a flat state, meeting the printing requirements of hard and thick print substrates, without bending the print substrate, and making the heating wire of the print head 22 perfectly fit the print substrate 3, thereby printing high-quality fonts and images.

[0051] For example, the width of the contact area between the printing end surface 27 of the print head 22 and the printing substrate 3 is 0.3mm to 0.4mm. This design ensures that the contact area between the printing end surface 21 of the print head 22 and the printing substrate 3 is only the width of a heating wire, ensuring that the heating wire of the print head 2 and the printing substrate 3 are perfectly aligned.

[0052] Exemplarily, the printing end face 27 of the print head 22 is coated with a wear-resistant coating, thereby improving the wear resistance of the print head and making it less likely to be damaged when printing on a hard printing substrate.

[0053] For example, the printing device 2 is electrically connected to a third sensor 26, which is disposed on the printing channel 21. When the third sensor 26 detects that the printing substrate 3 has been delivered to the printing channel 21, the system controls the printing device 2 to start and print on the printing substrate 3. Thus, the provision of the third sensor 26 can control the start and stop of the printing device 2, effectively preventing the printing device 2 from operating inefficiently and saving energy.

[0054] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A temporary license plate printing device, comprising a conveying device and a printing device, characterized in that: The conveying device is provided with a paper feed channel, a transition channel and a paper discharge channel in sequence according to the conveying direction of the printing substrate, the paper feed channel is arranged at an angle, and the paper discharge channel is arranged horizontally, a paper feeding mechanism capable of bringing a printing substrate from the paper feed channel to the transition channel is provided between the paper feed channel and the transition channel, a scanning mechanism for scanning and identifying the authenticity of the printing substrate is provided on the transition channel, a roller mechanism capable of bringing the printing substrate from the transition channel to the paper discharge channel is provided between the transition channel and the paper discharge channel, and a cleaning mechanism capable of cleaning the surface of the printing substrate is provided on the paper discharge channel; the inclination angle of the paper feed channel is 45 degrees to 65 degrees; the paper feed channel is provided with an entrance support plate and an introduction block on the side close to the transition channel, and the paper feed channel is provided with a plurality of supporting rollers on the side away from the transition channel, the entrance support plate and the supporting rollers both support the bottom surface of the printing substrate on the paper feed channel, the introduction block is provided on the side of the paper feed channel and above the entrance support plate, and the edge of the printing substrate is passed through the introduction block and passing between the entrance support plate; the introduction block is provided with an introduction slope on the side away from the transition channel; the scanning mechanism includes a scanning head and a second sensor, the scanning head is arranged above the transition channel, the second sensor is arranged on the side of the transition channel, and the second sensor is electrically connected to the scanning head, the second sensor is used to scan the QR code on the printing substrate to determine the authenticity of the printing substrate; the paper feed channel is provided with an entrance limit block on the side close to the transition channel for preventing the printing substrate from swinging left and right; the paper discharge channel is provided with an exit limit block on the side close to the printing device for preventing the printing substrate from swinging left and right; a transition support plate and two anti-warping rollers are provided on the transition channel, the transition support plate supports the bottom surface of the printing substrate on the transition channel, the two anti-warping rollers are arranged in parallel on the front and rear sides of the transition support plate, the left and right ends of the anti-warping rollers are respectively rotatably connected to the transition support plate through roller seats, and the printing substrate passes between the anti-warping rollers and the transition support plate.

2. A temporary license plate printing device according to claim 1, characterized in that: The paper pickup mechanism includes a first paper pressure roller, a paper pickup roller, and a first driving unit for driving the paper pickup roller to rotate. The first paper pressure roller and the paper pickup roller are arranged opposite to each other in an upper and lower direction. A first pinching channel is formed between the first paper pressure roller and the paper pickup roller, which can bring a printing substrate from the paper feed channel to the transition channel. The paper feed channel is provided with a first sensor on a side close to the transition channel. The first sensor is electrically connected to the first driving unit. When the first sensor detects that the printing substrate is delivered to the entrance support plate, the system controls the first driving unit to turn on and drive the paper pickup roller to drive the printing substrate to the side of the transition channel.

3. A temporary license plate printing device according to claim 1, characterized in that: A roller mechanism is provided between the transition channel and the paper discharge channel, the roller mechanism including a second paper pressing roller, a conveying roller and a second driving unit for driving the conveying roller to rotate, the second paper pressing roller and the conveying roller being arranged opposite to each other in an upper and lower direction, and a second pinching channel is formed between the second paper pressing roller and the conveying roller, which can bring the printed substrate from the transition channel into the paper discharge channel.

4. A temporary license plate printing device according to claim 1, characterized in that: The cleaning mechanism includes an upper cleaning roller, a lower roller and a cleaning cotton wheel. The upper cleaning roller and the lower roller are arranged opposite to each other in an upper and lower direction. The printing substrate passes between the upper cleaning roller and the lower roller. The cleaning cotton wheel is arranged above the upper cleaning roller and contacts the upper cleaning roller. The outer surface of the upper cleaning roller is provided with a rubber adhesion layer, and the outer surface of the cleaning cotton wheel is provided with double-sided tape.

5. A temporary license plate printing device according to any one of claims 1 to 4, characterized in that: The printing device includes a printing channel connected to the paper output channel, a print head arranged above the printing channel, a print roller arranged at the end of the printing channel, and a carbon ribbon retracting mechanism for releasing and recycling the carbon ribbon. The printing channel is arranged horizontally, and the top of the print roller is located on the same horizontal plane as the printing channel. The print head is an end print head, and the printing end face of the print head is opposite to the top of the print roller. The printing end face of the print head is embedded with a heating wire. The width of the contact between the printing end face of the print head and the printing substrate is 0.3mm to 0.4mm. The two side faces connected to the front and rear sides of the printing end face of the print head respectively form an angle with the horizontal plane where the printing channel is located. The printing end face of the print head is coated with a wear-resistant coating. The printing device is electrically connected to a third sensor, and the third sensor is arranged on the printing channel. When the third sensor detects that the printing substrate is delivered to the printing channel, the system controls the printing device to start and print on the printing substrate.

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