CN212708595U - Temporary license plate printer - Google Patents

Abstract

The utility model discloses a temporary license plate printer, it includes conveyor and printing device, conveyor is equipped with the paper feed passageway according to the direction of delivery who prints the substrate in proper order, transition passageway and play paper passageway, be equipped with scanning mechanism on the transition passageway, scanning mechanism includes scanning head and first sensor, the scanning head sets up the top at transition passageway, first sensor sets up by the side at transition passageway, and first sensor is connected with the scanning head electricity, when first sensor detects to print the substrate and sends to transition passageway, the system control scanning head is opened and is scanned the substrate of printing, wherein, be equipped with unique two-dimensional code on the printing substrate, when the scanning head scans the two-dimensional code, system ability automatic identification two-dimensional code information, and judge the true and false of printing the substrate. Adopt the utility model discloses, can stop to use the fake printing substrate to print and falsify the risk of license plate number at will, reduce the emergence of new car violating the regulations or criminal behavior, block up the supervision leak.

Description

Temporary license plate printer

Technical Field

The utility model belongs to the technical field of the printer, especially, relate to a temporary license plate printer.

Background

At present, a temporary license plate is provided for a vehicle owner before a new vehicle is licensed, and the temporary license plate is made of paper and is used by the vehicle owner in the vehicle.

Many car owners do not place interim license plate in the car, when leading to new car to break rules and regulations or the driver uses new car to carry out the criminal act of offending, can not find the car owner, even place interim license plate on the windshield in the car in addition, with current technique, electronic police's camera still can not accomplish the car owner of breaking rules and regulations of using interim license plate of any angle snapshot. This is a difficult problem to break through nationwide, and many cities have regulatory vulnerabilities in this regard.

In order to improve the supervision loophole, some experts propose to change the paper material of the temporary license plate into a plastic sheet with reflective paint, and verify and issue two sheets which are respectively hung on the vehicle head and the vehicle tail. However, no matter the temporary license plate is made of paper sheets, plastic sheets or other base materials, the temporary license plate can be obtained by copying through a simple means, and the risk of randomly modifying the number of the license plate exists. Therefore, it is necessary to design a printing apparatus dedicated to printing temporary license plates.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a interim license plate printer can stop to use the fake printing substrate to print and falsify the risk of license plate number at will, increases illegal cost, reduces the emergence of new car violating the regulations or criminal act, blocks up the supervision leak.

In order to achieve the above object, an aspect of the present invention provides a temporary license plate printer, which includes a conveying device and a printing device, wherein the conveying device is sequentially provided with a paper feeding channel, a transition channel and a paper discharging channel according to a conveying direction of a printing substrate, the transition channel is provided with a scanning mechanism, the scanning mechanism includes a scanning head and a first sensor, the scanning head is disposed above the transition channel, the first sensor is disposed beside the transition channel, the first sensor is electrically connected to the scanning head, when the first sensor detects that the printing substrate is conveyed to the transition channel, the system controls the scanning head to open and scan the printing substrate, wherein a unique two-dimensional code is disposed on the printing substrate, and when the scanning head scans the two-dimensional code, the system can automatically identify two-dimensional code information, and judging the authenticity of the printed substrate.

As the utility model discloses a preferred scheme, paper feed passageway is the slope setting, paper feed passageway's inclination is 45 degrees ~ 65 degrees.

As a preferred embodiment of the present invention, the paper feeding channel is provided with an inlet supporting plate and an introducing block on a side close to the transition channel, the paper feeding channel is provided with a plurality of supporting rollers on a side far from the transition channel, the inlet supporting plate and the supporting rollers both support the bottom surface of the printing substrate on the paper feeding channel, the introducing block is disposed beside the paper feeding channel and above the inlet supporting plate, and the edge of the printing substrate passes through between the introducing block and the inlet supporting plate; and a guide inclined plane is arranged on one side of the guide block, which is far away from the transition channel.

As a preferred scheme of the present invention, a paper twisting mechanism is disposed between the paper feeding channel and the transition channel, the paper twisting mechanism includes a first paper pressing wheel, a paper twisting wheel and a first driving unit for driving the paper twisting wheel to rotate, the first paper pressing wheel and the paper twisting wheel are disposed in an up-down opposite manner, and a first pinch channel capable of bringing a printing substrate from the paper feeding channel into the transition channel is formed between the first paper pressing wheel and the paper twisting wheel; a second sensor is arranged on one side, close to the transition channel, of the paper feed channel and is electrically connected with the first driving unit; when the second sensor detects that the printing base material is conveyed to the inlet supporting plate, the system controls the first driving unit to be started, and the paper pickup wheel is driven to drive the printing base material to convey to one side of the transition channel.

As the utility model discloses an optimal scheme, be equipped with transition layer board and two crooked roller bearings of proof warp on the transition passageway, the transition layer board bearing is in the bottom surface of the last printing substrate of transition passageway, two prevent warping the roller bearing set up parallelly in both sides around the transition layer board, both ends are rotationally connected to through the roller bearing seat respectively about the crooked roller bearing of proof warp on the transition layer board, print the substrate and follow prevent warping the roller bearing with pass through between the transition layer board.

As the utility model discloses an optimal scheme, the transition passageway with be equipped with gyro wheel mechanism between the play paper passageway, gyro wheel mechanism includes that the second presses paper wheel, delivery roller and is used for driving delivery roller pivoted second drive unit, the second press the paper wheel with delivery roller is relative setting from top to bottom, the second press the paper wheel with form between the delivery roller and can follow the printing substrate the transition passageway is taken into the second of going out the paper passageway presss from both sides the passageway.

As the utility model discloses an optimal scheme, paper feed passageway is being close to transition passageway one side is equipped with the entry stopper that is used for preventing to print the substrate and takes place the side to side beat, it is being close to go out the paper passageway printing device one side is equipped with the export stopper that is used for preventing to print the substrate and takes place the side to side beat.

As the utility model discloses an optimal scheme, printing device include with play paper passageway link to each other print the passageway, set up and print printer head, set up and printing the terminal print roller of passageway and be used for the release and retrieve the carbon ribbon jack of carbon ribbon printing passageway top, it is the level setting to print the passageway, the top of print roller with it is located same horizontal plane to print the passageway, print printer head and beat printer head for the terminal surface, beat printer head's printing terminal surface with print roller's top is relative, the printing terminal surface of printer head has set up the line that generates heat.

As the utility model discloses an optimal scheme, the width that beats printer head's printing terminal surface and printing substrate contact department is 0.3mm ~ 0.4mm, beat printer head's printing terminal surface around two sides continuous respectively with the horizontal plane at printing passageway place forms the contained angle, beat printer head's printing terminal surface and scribble wear-resistant coating.

As the utility model discloses a preferred scheme, the printing device electricity is connected with the third sensor, the third sensor sets up print on the passageway, work as the third sensor detects to print the substrate and send to during the printing passageway, system control printing device opens and prints to printing the substrate.

Implement the utility model provides a pair of interim license plate printer, compare with prior art, its beneficial effect lies in:

the utility model discloses a scanning mechanism's setting can scan the two-dimensional code before printing the substrate and getting into printing device, obtains the information that the printing substrate dispatched from the factory to according to the information that the printing substrate dispatched from the factory, judge the true and false of the printing substrate that uses, thereby can stop to use the fake printing substrate to print and falsify the risk of license plate number at will, increase illegal cost, reduce the emergence of new car violating the regulations or criminal behavior, block up the supervision leak. In addition, through the design of transition passageway, make paper feed passageway and go out the paper passageway between can smooth-going transition, avoid printing the excessive crooked and cause the loss of losing of substrate, provide installation space for scanning mechanism simultaneously, reduce the position that occupies the desk.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.

Fig. 1 is a schematic structural diagram of a temporary license plate printer provided by the present invention;

FIG. 2 is a schematic structural diagram (I) of the conveying device, the paper twisting mechanism, the scanning mechanism and the roller mechanism;

FIG. 3 is a structural schematic diagram (II) of the conveying device, the paper twisting mechanism, the scanning mechanism and the roller mechanism;

fig. 4 is a schematic structural diagram of the printing apparatus of the present invention.

FIG. 5 is a view showing the arrangement of the mounting of the end face print head and the print roller in the structure shown in FIG. 4;

fig. 6 is a mounting arrangement diagram of a conventional flat print head and print roller.

The labels in the figure are:

1. the device comprises a conveying device, a paper feeding channel, a paper discharging channel, a transition channel, a paper discharging channel, a paper inlet supporting plate, a paper outlet limiting block, a paper inlet limiting block, a paper outlet limiting block and a paper outlet limiting block;

2. printing device, 21, printing channel, 22, printing head (end face printing head), 23, printing roller, 24, carbon tape retracting and releasing mechanism, 25, carbon tape, 26, third sensor, 27, printing end face;

3. printing a substrate;

4. a paper twisting mechanism 41, a first paper pressing wheel 42, a paper twisting wheel 43 and a second sensor;

5. a scanning mechanism 51, a scanning head 52 and a first sensor;

6. a roller mechanism 61, a second paper pressing wheel 62 and a conveying roller.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, and do not indicate or imply that the machine or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

As shown in fig. 1 to 5, a temporary license plate printer according to a preferred embodiment of the present invention includes a conveying device 1 and a printing device 2, the conveying device 1 is sequentially provided with a paper feeding channel 11, a transition channel 12 and a paper discharging channel 13 according to a conveying direction of a printing substrate 3, the transition channel 12 is provided with a scanning mechanism 5, the scanning mechanism 5 includes a scanning head 51 and a first sensor 52, the scanning head 51 is disposed above the transition channel 12, the first sensor 52 is disposed beside the transition channel 12, the first sensor 52 is electrically connected to the scanning head 51, when the first sensor 52 detects that the printing substrate 3 is conveyed to the transition channel 12, a system controls the scanning head 51 to open and scan the printing substrate 3, wherein a unique two-dimensional code is disposed on the printing substrate 3, when the scanning head 51 scans the two-dimensional code, the system can automatically identify the two-dimensional code information and judge the authenticity of the printed base material 3.

From this, according to the utility model provides a pair of interim license plate printer, its key lies in: through the setting of scanning mechanism 5, can scan the two-dimensional code before printing substrate 3 and getting into printing device 2, obtain the information that prints substrate 3 and dispatch from the factory to according to the information that prints substrate 3 and dispatch from the factory, judge the true and false of printing substrate 3 that uses, thereby can stop to use false printing substrate 3 to print and falsify the risk of license plate number at will, increase illegal cost, reduce the emergence of new car violating the regulations or criminal behavior, block up the supervision leak. In addition, through the design of transition passageway 12, make smooth-going transition between paper feed passageway 11 and the play paper passageway 13, avoid printing substrate 3 excessively crooked and cause the breakage, provide installation space for scanning mechanism 5 simultaneously, reduce the position that occupies the desk.

It should be further noted that the first sensor 52 can control the start and stop of the scanning head 51, so as to effectively avoid the invalid operation of the scanning head 51 and save energy consumption.

Illustratively, the paper feeding channel 11 is arranged obliquely, and the inclination angle of the paper feeding channel 11 is 45-65 degrees. Therefore, the paper feeding mode is designed to be oblique paper feeding, the length of the printer can be shortened, and the position of an office table is greatly reduced; the inclination angle is designed to be 45-65 degrees, so that the printing substrate 3 can slide to the paper feeding side of the paper twisting mechanism under the action of self weight, and the problem that the printing substrate 3 is excessively bent to cause breakage due to the overlarge inclination angle can be avoided.

Illustratively, to ensure that the printing substrate 3 is fed straightly, the paper feed channel 11 is provided with an inlet support plate 14 and a guide block 15 at a side close to the transition channel 12, the inlet support plate 14 supports the bottom surface of the printing substrate 3 on the paper feed channel 11, the guide block 15 is arranged at a side (specifically, a side wall) of the paper feed channel 11 and above the inlet support plate 14, and an edge portion of the printing substrate 3 passes between the guide block 15 and the inlet support plate 14; paper feed passageway 11 is keeping away from transition passageway 12 one side is equipped with a plurality of bearing rollers 16, bearing roller 16 bearing is in the bottom surface of printing substrate 3 on the paper feed passageway 11, this bearing roller 16's design can reduce paper feed passageway 11 to the resistance of printing substrate 3, conveniently prints substrate 3 landing under the dead weight effect. Further, the guiding block 15 is provided with a guiding inclined surface at a side far away from the transition channel 12, and the guiding inclined surface can facilitate the edge of the printing substrate 3 to be inserted between the guiding block 15 and the inlet support plate 14.

Illustratively, a pickup mechanism 4 is disposed between the paper feeding channel 11 and the transition channel 12, the pickup mechanism 4 includes a first paper pressing wheel 41, a pickup wheel 42 and a first driving unit for driving the pickup wheel 42 to rotate, the first paper pressing wheel 41 and the pickup wheel 42 are disposed opposite to each other in the vertical direction, and a first pinch channel capable of bringing a printing substrate 3 from the paper feeding channel 11 into the transition channel 12 is formed between the first paper pressing wheel 41 and the pickup wheel 42. The first paper pressing wheel 41 has a certain displacement space, and can be close to or far from the paper twisting wheel 42, and the first paper pressing wheel 41 presses the paper twisting wheel 42 or the printing substrate 3 under the action of a spring. Thus, when the first driving unit drives the pickup roller 42 to rotate, an engagement force is formed between the first platen roller 41 and the pickup roller 42 to bring the printing substrate 3 from the paper feeding path 11 into the transition path 12.

Further, the paper feeding channel 11 is provided with a second sensor 43 at a side close to the transition channel 12, the second sensor 43 is arranged on the inlet tray 14, and the second sensor 43 is electrically connected with the first driving unit; when the second sensor 43 detects that the printing substrate 3 is sent to the inlet pallet 14, the system controls the first driving unit to be started, and drives the paper pickup wheel 42 to drive the printing substrate 3 to be conveyed to one side of the transition channel 12. Therefore, the second sensor 43 can control the start and stop of the first driving unit, effectively avoid the generation of invalid work of the first driving unit, and save energy consumption.

Exemplarily, be equipped with transition layer board 17 and two warpage preventing rollers 18 on transition passageway 12, transition layer board 17 bearing is in the bottom surface of printing substrate 3 on transition passageway 12, two warpage preventing rollers 18 set up parallelly in both sides around transition layer board 17, both ends are rotationally connected to through the roller bearing seat respectively about warpage preventing rollers 18 on the transition layer board 17, printing substrate 3 follows warpage preventing rollers 18 with pass through between the transition layer board 17. Due to the design, the printing substrate 3 can be conveyed on the transition channel 12 in a straight mode, the warping of the printing substrate 3 is prevented, the accurate detection and positioning of the first sensor 52 are facilitated, and the scanning head 51 can scan the two-dimensional code on the printing substrate 3 conveniently.

Illustratively, a roller mechanism 6 is arranged between the transition channel 12 and the paper output channel 13, the roller mechanism 6 includes a second paper pressing wheel 61, a conveying roller 62 and a second driving unit for driving the conveying roller 62 to rotate, the second paper pressing wheel 61 and the conveying roller 62 are arranged in an up-down opposite manner, and a second pinch channel capable of bringing the printing substrate 3 from the transition channel 12 into the paper output channel 13 is formed between the second paper pressing wheel 61 and the conveying roller 62. The second platen 61 has a displacement space that can be close to or away from the transport roller 62, and the second platen 61 presses the transport roller 62 or the print substrate 3 under the action of a spring. Thus, when the second driving unit drives the conveying roller 62 to rotate, an engagement force is formed between the second platen roller 61 and the conveying roller 62 to bring the printing substrate 3 from the transition path 12 into the paper ejection path 13.

It should be noted that the first driving unit and the second driving unit of the present embodiment are the same driving unit, and the paper feeding roller 42 and the conveying roller 62 are synchronously rotated through the gear transmission mechanism.

Illustratively, the paper feeding channel 11 is provided with an inlet stopper 19a at a side close to the transition channel 12 for preventing the printing substrate 3 from swinging left and right. The inlet stopper 19a is connected to a side of the paper feeding path 11 through a spring and is disposed opposite to the guide block 15. Therefore, the inlet limiting block 19a presses the printing substrate 3 on the side wall of the other side of the paper feeding channel 11 under the action of the spring, so that left and right deviations of the printing substrate 3 in the conveying process are prevented, and the printing precision is improved.

Illustratively, the paper output channel 13 is provided with an outlet stopper 19b at a side close to the printing device 2 for preventing the printing substrate 3 from swinging left and right. The outlet limiting block 19b is connected to the side of the paper discharging channel 13 through a spring. From this, export stopper 19b will print substrate 3 and compress tightly on the lateral wall of play paper passageway 13 opposite side under the spring action to prevent to print substrate 3 and control the deviation about appearing in transportation process, improved the precision of printing.

For example, since the conventional flat printing head has a certain angle with the paper path, and the printing plane of the flat printing head has an adhesive for encapsulating electronic components (e.g., IC), which protrudes and deviates from the top end of the printing roller (as shown in fig. 6), when printing a hard and thick (0.5mm to 1.2mm) printing substrate, the adhesive portion presses the printing substrate to bend the printing substrate, and since the material (e.g., PC, PVC, or PET) of the printing substrate 3 is hard, the heating line of the printing head is difficult to completely adhere to the printing surface of the printing substrate 3, thereby affecting the printing quality and showing the result that the printing is not clear or the characters and images cannot be printed; and the coating of the existing printing head cannot adapt to the scratch of the hard printing substrate 3, and the printing head is easy to damage. Therefore, the printing apparatus 2 of the present embodiment selects the end face print head, and changes the installation manner of the print head and the print roller, specifically: printing device 2 include with go out paper passageway 13 continuous print passageway 21, set up at the printer head 22 of printing passageway 21 top, set up at the printing roller 23 of printing passageway 21 end and be used for releasing and retrieve carbon ribbon winding and unwinding mechanism 24 of carbon ribbon 25, print passageway 21 is the horizontal setting, the top of printing roller 23 with print passageway 21 is located same horizontal plane, printer head 22 is the terminal surface print head, printer head 22 the printing terminal surface 27 with printer head 23's top is relative, printer head 22's printing terminal surface 27 inlays and has set up the line that generates heat. Therefore, the utility model discloses a select the terminal surface to beat printer head to the mounting means who beats printer head 22 and print roller 23 is changed, can make the printing terminal surface 27 that beats printer head 22 just in time lie in the top position of print roller 23 with printing substrate 3 contact department, makes whole printing substrate 3 print and carry under the horizontality, satisfies the printing demand of stereoplasm and thicker printing substrate, can not press the bending to printing substrate, makes the line that generates heat that beats printer head 22 and the perfect laminating of printing substrate 3, prints out high-quality typeface and image.

Illustratively, the width of the printing end face 27 of the printing head 22 in contact with the printing substrate 3 is 0.3mm to 0.4 mm. Due to the design, the width of the contact part of the printing end face 21 of the printing head 22 and the printing base material 3 is only the width of one heating wire, and the perfect fit of the heating wire of the printing head 2 and the printing base material 3 is ensured.

Illustratively, the print head 22 has a wear-resistant coating on the print face 27 to improve the wear resistance of the print head so that the print head is not easily damaged when printing hard print substrates.

Illustratively, the printing device 2 is electrically connected with a third sensor 26, the third sensor 26 is arranged on the printing channel 21, and when the third sensor 26 detects that the printing substrate 3 is sent to the printing channel 21, the system controls the printing device 2 to start and print the printing substrate 3. Therefore, the third sensor 26 can control the start and stop of the printing device 2, effectively avoiding the invalid operation of the printing device 2 and saving energy consumption.

Additionally, another aspect of the utility model provides a printing substrate 3 true and false recognition method of interim license plate printer, it includes following step:

(1) printing a unique two-dimensional code preprinted when the base material 3 leaves a factory;

(2) before the printing substrate 3 enters the printing device 2, scanning the two-dimensional code to obtain factory information of the printing substrate;

(3) judging the authenticity of the used printing base material 3 according to the factory information of the printing base material;

if the used printing substrate 3 is judged to be true, printing the temporary number plate applied by the applicant; if the used printing substrate 3 is judged to be false, printing is stopped, and error information is sent.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a temporary license plate printer, includes conveyor and printing device, its characterized in that, conveyor is equipped with paper feed passageway, transition passageway and goes out the paper passageway according to the direction of delivery who prints the substrate in proper order, be equipped with scanning mechanism on the transition passageway, scanning mechanism includes scanning head and first sensor, the scanning head sets up the top of transition passageway, first sensor sets up the side of transition passageway is other, just first sensor with the scanning head electricity is connected, works as first sensor detects that the printing substrate is delivered to during the transition passageway, system control the scanning head is opened and is scanned the printing substrate, wherein, is equipped with only two-dimensional code on the printing substrate, and when scanning head scanned the two-dimensional code, the system can automatic identification two-dimensional code information to judge the true and false of printing the substrate.

2. The printer of claim 1, wherein the feeding path is inclined at an angle of 45-65 degrees.

3. The temporary license plate printer of claim 2, wherein the paper feed path is provided with an inlet tray and an inlet block at a side close to the transition path, the paper feed path is provided with a plurality of support rollers at a side far from the transition path, the inlet tray and the support rollers support a bottom surface of the printing substrate on the paper feed path, the inlet block is disposed at a side of the paper feed path and above the inlet tray, and an edge portion of the printing substrate passes between the inlet block and the inlet tray; and a guide inclined plane is arranged on one side of the guide block, which is far away from the transition channel.

4. The temporary license plate printer of claim 3, wherein a pickup mechanism is disposed between the paper feeding channel and the transition channel, the pickup mechanism includes a first platen roller, a pickup roller, and a first driving unit for driving the pickup roller to rotate, the first platen roller and the pickup roller are disposed opposite to each other in a vertical direction, and a first pinch channel for bringing a printing substrate from the paper feeding channel into the transition channel is formed between the first platen roller and the pickup roller; a second sensor is arranged on one side, close to the transition channel, of the paper feed channel and is electrically connected with the first driving unit; when the second sensor detects that the printing base material is conveyed to the inlet supporting plate, the system controls the first driving unit to be started, and the paper pickup wheel is driven to drive the printing base material to convey to one side of the transition channel.

5. The temporary license plate printer of claim 1, wherein the transition channel is provided with a transition support plate and two anti-warping rollers, the transition support plate supports the bottom surface of the printing substrate on the transition channel, the two anti-warping rollers are arranged on the front side and the rear side of the transition support plate in parallel, the left end and the right end of the anti-warping roller are rotatably connected to the transition support plate through roller seats respectively, and the printing substrate passes through the anti-warping rollers and the transition support plate.

6. The temporary license plate printer of claim 1, wherein a roller mechanism is disposed between the transition channel and the paper exit channel, the roller mechanism includes a second platen roller, a conveying roller and a second driving unit for driving the conveying roller to rotate, the second platen roller and the conveying roller are disposed opposite to each other, and a second pinch channel for bringing the printing substrate from the transition channel into the paper exit channel is formed between the second platen roller and the conveying roller.

7. The temporary license plate printer of claim 1, wherein the paper feeding channel is provided with an inlet stopper at a side near the transition channel for preventing the printing substrate from swinging left and right, and the paper discharging channel is provided with an outlet stopper at a side near the printing device for preventing the printing substrate from swinging left and right.

8. The temporary license plate printer of any one of claims 1 to 7, wherein the printing device comprises a printing channel connected to the paper outlet channel, a printing head disposed above the printing channel, a printing roller disposed at the end of the printing channel, and a thermal ribbon retracting mechanism for releasing and retracting the thermal ribbon, the printing channel is disposed horizontally, the top end of the printing roller and the printing channel are located on the same horizontal plane, the printing head is an end face printing head, the printing end face of the printing head is opposite to the top end of the printing roller, and a heating wire is embedded in the printing end face of the printing head.

9. The temporary license plate printer of claim 8, wherein the width of the contact part of the printing end surface of the printing head and the printing substrate is 0.3 mm-0.4 mm, two side surfaces connected with the front side and the rear side of the printing end surface of the printing head form included angles with a horizontal plane where the printing channel is located, and the printing end surface of the printing head is coated with an abrasion-resistant coating.

10. A temporary license plate printer as recited in claim 8, wherein the printing device is electrically connected to a third sensor, the third sensor being disposed in the print tunnel, the system controlling the printing device to turn on and print on the print substrate when the third sensor detects that the print substrate is fed into the print tunnel.

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