Duplex printer

Abstract

The present invention relates to the technical field of printing devices, and disclosed is a duplex printer. The duplex printer comprises a first conveying mechanism, a first printing mechanism, a guide mechanism, a second conveying mechanism and a second printing mechanism. The first conveying mechanism is used for conveying paper in a first direction, the paper comprising a first surface and a second surface opposite to each other, and the first surface of the paper located in the first conveying mechanism facing upwards. The first printing mechanism is used for printing on the first surface. The guide mechanism is used for receiving the paper obtained after imaging on the first surface, and flipping the paper to cause the second surface thereof to face upwards. The second conveying mechanism is used for receiving the paper flipped by the guide mechanism, and conveying same in a second direction opposite to the first direction. The second printing mechanism is used for printing on the second surface. The duplex printer provided by the present application can improve the duplex printing efficiency and ensure the image quality.

Description

A duplex printer Technical Field

[0001] This invention relates to the field of printing equipment technology, and more particularly to a duplex printer. Background Technology

[0002] Laser duplex printers are an indispensable piece of equipment in modern office environments. They utilize duplex printing technology to print on both sides of the same sheet of paper. The advent of duplex printing technology has greatly improved printing efficiency, reduced paper usage, and met environmental protection requirements.

[0003] Laser duplex printers in related technologies fall into two categories. One type uses the forward and reverse rotation of a drive motor to move the paper through the printing paths on both sides, thus achieving duplex printing. This structure requires motor rotation and start / stop, resulting in lower printing efficiency. The other type features a more complex printing path design, using positive and negative electric fields to simultaneously transfer toner with different charges to both sides of the paper. However, in this design, the support structure on the paper path is prone to contact with the toner on the unfixed and imaged paper surface, affecting print quality.

[0004] Therefore, how to provide a laser duplex printer that balances printing efficiency and print quality is a research direction in printing equipment technology.

[0005] Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a duplex printer, including a first conveying mechanism, a first printing mechanism, a guiding mechanism, a second conveying mechanism, and a second printing mechanism. The first conveying mechanism is used to convey paper along a first direction. The paper includes a first surface and a second surface that are opposite to each other. The first surface of the paper located in the first conveying mechanism is arranged facing upwards. The first printing mechanism is used to print on the first surface. The guiding mechanism is used to receive the paper after it has been imaged on the first surface and flip the paper so that the second surface faces upwards. The second conveying mechanism is used to receive the paper after it has been flipped by the guiding mechanism and convey the paper along a second direction opposite to the first direction. The second printing mechanism is used to print on the second surface.

[0007] In some embodiments of the present invention, the first printing mechanism includes a first laser scanning unit and a first imaging component. The first laser scanning unit is located above the first conveying mechanism and is disposed facing the first surface. The first imaging component is used to receive the laser light from the first laser scanning unit and form an image on the first surface. And / or, the second printing mechanism includes a second laser scanning unit and a second imaging component. The second laser scanning unit is located above the second conveying mechanism and is disposed facing the second surface. The second imaging component is used to receive the laser light from the second laser scanning unit and form an image on the second surface.

[0008] In some embodiments of the present invention, the first imaging component includes a first photosensitive drum and a first transfer roller, wherein the first photosensitive drum is located below the first laser scanning unit and the first transfer roller is located below the first photosensitive drum.

[0009] In some embodiments of the present invention, the second imaging component includes a second photosensitive drum and a second transfer roller, wherein the second photosensitive drum is located below the second laser scanning unit and the second transfer roller is located below the second photosensitive drum.

[0010] In some embodiments of the present invention, the first imaging component and the second imaging component are arranged at intervals in a vertical direction, and at least a portion of the guide mechanism is located between the first imaging component and the second imaging component.

[0011] In some embodiments of the present invention, the first imaging component is located below the second imaging component, and the first laser scanning unit is located between the first imaging component and the second imaging component.

[0012] In some embodiments of the present invention, the first printing mechanism further includes a first fixing component located between the first imaging component and the guiding mechanism, the first fixing component acting on the first surface after the first imaging; and / or, the second printing mechanism further includes a second fixing component acting on the second surface after the second imaging.

[0013] In some embodiments of the present invention, the guiding mechanism includes a guide member, the guide member including a first guide surface and a second guide surface connected to each other, the first guide surface being used to receive the paper after the first surface is imaged and to flip the paper at a first angle, the second guide surface being used to receive the paper flipped at the first angle and to flip the paper at a second angle so that the second surface of the paper faces upward.

[0014] In some embodiments of the present invention, the first guide surface is arranged in a vertical direction, the second guide surface is arranged in a horizontal direction, and the junction of the first guide surface and the second guide surface is rounded.

[0015] In some embodiments of the present invention, the first conveying mechanism includes a first correcting roller assembly and a first paper discharge roller assembly arranged sequentially along the first direction, the first imaging assembly being located between the first correcting roller assembly and the first paper discharge roller assembly, the first correcting roller assembly being used to receive and correct the conveyed paper, and the first paper discharge roller assembly being used to convey the paper to the guiding mechanism; and / or, the second conveying mechanism includes a second correcting roller assembly and a second paper discharge roller assembly arranged sequentially along the second direction, the second imaging assembly being located between the second correcting roller assembly and the second paper discharge roller assembly, the second correcting roller assembly being used to receive and correct the conveyed flipped paper, and the first paper discharge roller assembly being used to convey the paper out of the duplex printer.

[0016] The duplex printer provided by this invention has the following beneficial effects:

[0017] By directly feeding and flipping the paper using the first conveying mechanism, the guiding mechanism, and the second conveying mechanism, there is no need to start, stop, or reverse the first and second conveying mechanisms, thereby saving printing time and improving printing efficiency. In addition, during the printing and feeding process of the duplex printer of this application, the surface of the paper to be printed is always facing upwards. This ensures that during the feeding process after printing on the second surface, the support structure located below the paper will not come into contact with the printed surface image, thereby ensuring print quality. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 is a schematic diagram of the printing path of a duplex printer provided in an embodiment of this application;

[0020] Figure 2 is a structural schematic diagram of a duplex printer provided in one embodiment of this application.

[0021] The attached figures are labeled as follows:

[0022] 100. Duplex printer;

[0023] 10. First conveying mechanism; 11. First straightening roller assembly; 12. First paper discharge roller assembly;

[0024] 20. First printing mechanism; 21. First laser scanning unit; 22. First imaging assembly; 221. First photosensitive drum; 222. First transfer roller; 23. First fixing assembly; 231. First heating roller; 232. First pressure roller;

[0025] 30. Guiding mechanism; 31. Guiding component; 311. First guiding surface; 312. Second guiding surface; 313. Arc transition surface;

[0026] 40. Second conveying mechanism; 41. Second straightening roller assembly; 42. Second paper discharge roller assembly;

[0027] 50. Second printing mechanism; 51. Second laser scanning unit; 52. Second imaging assembly; 521. Second photosensitive drum; 522. Second transfer roller; 53. Second fixing assembly; 531. Second heating roller; 532. Second pressure roller;

[0028] 200. Paper; 210. First surface; 220. Second surface;

[0029] X, first direction; Y, second direction; Z, vertical direction. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should be understood that although the terms first, second, third, etc., may be used to describe the acquisition modules in the embodiments of the present invention, these acquisition modules should not be limited to these terms. These terms are only used to distinguish the acquisition modules from each other.

[0033] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0034] It should be noted that the directional terms such as "upper," "lower," "left," and "right" used in the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should be understood that when it is mentioned that an element is formed "upper" or "lower" of another element, it can not only be formed directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element.

[0035] One type of duplex printer in related technologies operates by having the conveyor motor rotate forward during the printing of the first surface of the paper, driving the paper into the printing path of the first surface and sequentially completing the imaging and fixing of the first surface. After the first surface is printed, the paper ejection roller at the end of the path does not completely remove the paper. At this point, the power to the first surface printing path is disengaged via a clutch, the main motor rotates in reverse, and drives the paper into the printing path of the second surface, completing the flipping of the paper head and tail and the printing surface. When the paper enters the correction roller, the power to the duplex paper path is disengaged via a clutch, the motor rotates forward, and the reverse side of the paper is printed. Because this structure involves starting and stopping the motor in both directions for paper flipping, and because the path required for flipping the paper is too long, its speed is generally only 1 / 3 or less of the single-sided printing speed, resulting in low printing production efficiency.

[0036] Another type of duplex printer uses positive and negative electric fields to simultaneously transfer toner (developer) with different charges to both sides of the paper, and then the paper enters the fixing module for heating and curing of the toner. However, because there is uncured toner on both sides of the paper along the path between the transfer roller and the fixing module, it is easily affected by the paper guides in the paper path structure before entering the fixing module, making it difficult to guarantee the image printing quality.

[0037] In view of this, this embodiment provides a duplex printer that forms the paper transport path in an approximately C-shaped structure, so that the paper surface is always facing upwards during printing, and the surface of the image formed during printing is always facing upwards, thus not being affected by the support structure.

[0038] The structure of the duplex printer provided in the embodiments of this application will be described below with reference to Figures 1-2. The arrows not marked in the figures indicate the paper feeding direction.

[0039] As shown in Figures 1 and 2, this application provides a duplex printer 100, including a first conveying mechanism 10, a first printing mechanism 20, a guiding mechanism 30, a second conveying mechanism 40, and a second printing mechanism 50.

[0040] In this embodiment, a portion of the first conveying mechanism 10 may be located near the paper inlet of the duplex printer 100. The first conveying mechanism 10 is used to receive the paper 200 and convey the paper 200 along the first direction X (from left to right in the figure). The first conveying mechanism 10 may include multiple conveying roller assemblies, such as the first correcting roller assembly 11 and the first paper output roller assembly 12 described below. Of course, the specific structural form of the first conveying mechanism 10 is not limited to this, as long as it can convey the paper 200 from the paper inlet to the guiding mechanism 30.

[0041] When the paper 200 enters the first conveying mechanism 10, the first conveying mechanism 10 continues to convey the paper without stopping. At this time, the first surface 210 of the paper 200 on the first conveying mechanism 10 is facing upward. It should be understood that the directional words such as "up", "down", "vertical", and "horizontal" mentioned in this embodiment refer to the direction or position of the duplex printer 100 body during normal use.

[0042] When the first conveying mechanism 10 completely discharges the paper 200, a portion of the paper 200 has already been flipped on the guiding mechanism 30 and has entered the second conveying mechanism 40. Therefore, in some embodiments, the guiding mechanism 30 may not have the function of conveying the paper 200, but only the function of receiving and guiding the flipping of the paper 200.

[0043] Of course, in some embodiments, the guide mechanism 30 can also be used for conveying the paper 200, for example, by adding a conveying structure such as a conveying roller to the guide mechanism 30 (not shown in the figure).

[0044] In this embodiment, the first printing mechanism 20 is located on the paper 200 transport path of the first transport mechanism 10, and at least a portion of the first printing mechanism 20 is located above the first surface 210 of the paper 200, thereby enabling printing on the first surface 210 of the paper 200.

[0045] It should be noted that the printing of the first surface 210 of the paper 200 by the first printing mechanism 20 refers to the formation of a stable image on the paper 200. The specific printing process may include the transfer of toner to the first surface 210 and heat curing (fixing).

[0046] The guide mechanism 30 in this embodiment is used to receive the paper 200 after it has been imaged on the first surface 210 and to flip the paper 200 so that the second surface 220 faces upward. The specific structure of the guide mechanism 30 is given below.

[0047] In this embodiment, the second conveying mechanism 40 may be partially located near the paper outlet of the machine body. The second conveying mechanism 40 is used to receive the paper 200 after it has been flipped by the guiding mechanism 30. The second conveying mechanism 40 is used to convey the paper 200 along the second direction Y (from right to left in the figure) opposite to the first direction X. The second conveying mechanism 40 can also discharge the paper 200 to the outside of the duplex printer 100.

[0048] In some embodiments, the second conveying mechanism 40 may include the second straightening roller assembly 41 and the second paper row roller assembly 42 described below. Of course, the specific structural form of the second conveying mechanism 40 is not limited to this, as long as it can convey the paper 200 from the guide mechanism 30 to the paper outlet.

[0049] The second printing mechanism 50 is used to form an image on the second surface 220. Similar to the first printing mechanism 20 described above, the second printing mechanism 50 in this embodiment is located on the paper 200 transport path of the second transport mechanism 40, and at least a portion of the second printing mechanism 50 is located above the second surface 220 of the paper 200, thereby enabling printing on the second surface 220 of the paper 200.

[0050] The printing of the second surface 220 of the paper 200 by the second printing mechanism 50 also refers to the formation of a stable image on the paper 200. The specific printing process may include the transfer of toner to the second surface 220 and heat curing (fixing).

[0051] The duplex printer 100 with the above-described structure in this embodiment has at least the following advantages compared to the two printers in the related art:

[0052] First, the duplex printer 100 in this embodiment directly transports and flips the paper 200 using the first conveying mechanism 10, the guiding mechanism 30, and the second conveying mechanism 40, without needing to start, stop, or reverse the first conveying mechanism 10 and the second conveying mechanism 40, thereby saving printing time and improving printing efficiency.

[0053] Furthermore, in the process of printing and conveying paper 200, the duplex printer 100 of this embodiment can ensure that the surface to be printed on the paper 200 is always facing upwards during the printing process. This ensures that during the conveying process after printing on the second surface 220, the support structure located below the paper 200 will not come into contact with the unfixed surface image, thereby ensuring print quality.

[0054] Referring again to Figures 1 and 2, in some examples, optionally, the first printing mechanism 20 of this embodiment includes a first laser scanning unit 21 and a first imaging component 22, and / or, the second printing mechanism 50 of this embodiment includes a second laser scanning unit 51 and a second imaging component 52.

[0055] The above technical solutions include at least three implementation methods. One method involves the first printing mechanism 20 including a first laser scanning unit 21 and a first imaging component 22. The first printing mechanism 20 is a laser printing mechanism, while the second printing mechanism 50 is not a laser printing mechanism but uses other printing methods. Another method involves the second printing mechanism 50 including a second laser scanning unit 51 and a second imaging component 52. The second printing mechanism 50 is a laser printing mechanism, while the first printing mechanism 20 is not. A further method involves the first printing mechanism 20 including a first laser scanning unit 21 and a first imaging component 22, while the second printing mechanism 50 includes a second laser scanning unit 51 and a second imaging component 52. In this case, both the first printing mechanism 20 and the second printing mechanism 50 are laser printing structures. This embodiment describes the last implementation method as an example.

[0056] The first laser scanning unit 21 is located above the first conveying mechanism 10 and is disposed toward the first surface 210. The first laser scanning unit 21 needs to have a certain distance from the first surface 210, which can conveniently accommodate at least part of the first imaging component 22 in this embodiment.

[0057] The first laser scanning unit 21 transmits a laser beam (generated by a laser diode) through a series of mirrors and a focusing lens to the first imaging component 22 of this embodiment (specifically, to the first photosensitive drum 221 described below).

[0058] After receiving the laser from the first laser scanning unit 21, the first imaging component 22 sets the toner on the first surface 210 to form an image on the first surface 210.

[0059] Similarly, the second printing mechanism 50 includes a second laser scanning unit 51 and a second imaging component 52. The second laser scanning unit 51 is located above the second conveying mechanism 40 and is disposed toward the second surface 220. The second laser scanning unit 51 needs to have a certain distance from the second surface 220, which can conveniently accommodate at least part of the second imaging component of this embodiment.

[0060] The second laser scanning unit 51 irradiates the second imaging component 52 of this embodiment with a laser beam (specifically, it irradiates the second photosensitive drum 521 described below). After receiving the laser beam from the second laser scanning unit 51, the second imaging component 52 sets toner on the second surface 220 to form an image on the second surface 220.

[0061] In some examples, the first imaging component 22 of this embodiment may optionally include a first photosensitive drum 221 and a first transfer roller 222.

[0062] In this embodiment, the first photosensitive drum 221 is located below the laser scanning unit and above the first surface 210. The first photosensitive drum 221 can come into contact with the first surface 210 during the paper 200 being transported along the first direction X.

[0063] The first transfer roller 222 is located below the first photosensitive drum 221 and is in contact with the second surface 220 of the paper 200. The first photosensitive drum 221 and the first transfer roller 222 form an imaging and transfer system for the first surface 210 of the paper 200.

[0064] When the first imaging component 22 of this embodiment performs imaging operations, the first photosensitive drum 221 of this embodiment receives laser irradiation from the first laser scanning unit 21 and adsorbs charged toner provided by the toner supply roller (not shown in the figure) at the irradiation point. Due to the attraction of the charge, the toner is adsorbed onto the unexposed, charged area on the photosensitive drum to form an image.

[0065] The first photosensitive drum 221 carrying the toner image continues to rotate. When it comes into contact with the first surface 210 of the paper 200, the first transfer roller 222 of this embodiment is positively charged. The attraction of the charge causes the toner to be transferred from the first photosensitive drum 221 to the first surface 210 of the paper 200, forming a visible image.

[0066] Similarly, in some examples, optionally, the second imaging component 52 of this embodiment includes a second photosensitive drum 521 and a second transfer roller 522. The second photosensitive drum 521 is located below the second laser scanning unit 51 and above the second surface 220. The second transfer roller 522 is located below the second photosensitive drum 521 and below the first surface 210 of the paper 200. The second photosensitive drum 521 and the second transfer roller 522 form an imaging and transfer system for the second surface 220 of the paper 200.

[0067] The imaging process of the second photosensitive drum 521 and the second transfer roller 522 on the second surface 220 can be referred to the above description of the first photosensitive drum 221 and the first transfer roller 222, and will not be repeated in this embodiment.

[0068] In some examples, optionally, the first imaging component 22 and the second imaging component 52 are arranged at intervals along the vertical direction Z. The vertical direction Z is different from the first direction X and the second direction Y mentioned above, which have only one directional component. The vertical direction Z described in this embodiment has two opposite sub-directions, one from top to bottom and the other from bottom to top.

[0069] Therefore, the arrangement of the first imaging component 22 and the second imaging component 52 at intervals along the vertical direction Z in this embodiment can be understood to include two cases. One is that the first imaging component 22 and the second imaging component 52 are arranged at intervals from bottom to top as shown in the figure, and the other is that the first imaging component 22 and the second imaging component 52 are arranged at intervals from top to bottom (not shown in the figure). Both methods can form a paper 200 transport path that is approximately C-shaped.

[0070] In this embodiment, the guide mechanism 30 is at least partially located between the first imaging component 22 and the second imaging component 52. That is, the guide mechanism 30 can be entirely located between the first imaging component 22 and the second imaging component 52, or it can be partially located between the first imaging component 22 and the second imaging component 52. For example, the lower end of the guide mechanism 30 in Figure 2 can be located below the first imaging component 22, and the upper end of the guide mechanism 30 can be roughly level with the second imaging component 52. This embodiment does not impose too much limitation on the specific position of the guide mechanism 30, as long as the guide mechanism 30 can satisfy the flipping guide function of the paper 200.

[0071] In some examples, optionally, the first imaging component 22 of this embodiment is located below the second imaging component 52, the first laser scanning unit 21 is located between the first imaging component 22 and the second imaging component 52, and the second laser scanning unit 51 is located above the second imaging component 52, so that the running path of the paper 200 forms an approximate C-shaped mirror shape.

[0072] In addition to the first laser scanning component and the first imaging component 22 mentioned above, the first printing mechanism 20 of this embodiment also includes a first fixing component 23. The first fixing component 23 is located between the first imaging component 22 and the guide mechanism 30. The first fixing component 23 is used for fixing the first surface 210 after imaging.

[0073] Specifically, the first fixing assembly 23 of this embodiment includes a first heating roller 231 and a first pressure roller 232. The first heating roller 231 is located above the first pressure roller 232, and the two form a gap for the paper 200 to pass through.

[0074] The function of the first pressure roller 232 is to ensure close contact between the paper 200 and the first heating roller 231. The paper 200 is pressed onto the first heating roller 231 by structural pressure such as torsion springs, thereby effectively fixing the toner onto the paper.

[0075] The first heating roller 231 is used to heat the paper 200, melt the uncured toner on the paper 200, and immerse it in the fibers of the paper 200 to fix it, thereby forming a stable image on the first surface 210. This ensures that the image quality is maintained after the first surface 210 is flipped and comes into contact with the support structure (not shown in the figure) such as the support ribs in the machine body, so as to facilitate the subsequent printing of the second surface 220.

[0076] In addition, the first fixing assembly 23 may also include a paper output sensor (not shown in the figure), which is used to detect whether the outer edge or tail of the paper 200 passes through the first heating roller 231 and the first pressure roller 232, and is also used to detect whether there is a paper jam in the fixing / paper output module.

[0077] Similarly, the second printing mechanism 50 in this embodiment also includes a second fixing component 53, which is used for fixing the imaged second surface 220.

[0078] The second fixing assembly 53 may include a second heating roller 531 and a second pressure roller 532. The second heating roller 531 is located above the second pressure roller 532, and the two form a gap that can press the paper 200. The working principle of the second heating roller 531 and the second pressure roller 532 can be referred to the first heating roller 231 and the first pressure roller 232 described above, and will not be repeated in this embodiment.

[0079] The image on the second surface 220 after being fixed by the second fixing assembly 53 can be guaranteed in quality, thereby maintaining the stability of the image during the paper output process.

[0080] Referring again to Figure 2, in some examples, optionally, the guide mechanism 30 of this embodiment includes a guide member 31, which includes a first guide surface 311 and a second guide surface 312 connected sequentially along the vertical direction Z.

[0081] In this embodiment, the first guide surface 311 is used to receive the paper 200 after it has been imaged on the first surface 210 and to flip the paper 200 at a first angle. The second guide surface 312 is used to receive the paper 200 after it has been flipped at the first angle and to flip the paper 200 at a second angle so that the second surface 220 of the paper 200 faces upward.

[0082] In some embodiments, the first guide surface 311 of this embodiment is located below the second guide surface 312, and the first guide surface 311 is arranged in a vertical direction Z, while the second guide surface 312 is arranged in a horizontal direction. When the paper 200 enters the first guide surface 311, it rotates for the first time, causing the portion of the paper 200 located on the first guide surface 311 to flip by about 90°. Then, when it enters the second guide surface 312, the paper 200 rotates by about 90° again, thereby realizing the flipping and repositioning of the first surface 210 and the second surface 220.

[0083] To reduce the impact on the image on the first surface 210 during the flipping process, the junction of the first guide surface 311 and the second guide surface 312 in this embodiment can be designed as an arc transition. Specifically, an arc transition surface 313 is provided between the first guide surface 311 and the second guide surface 312, which can smoothly connect the first guide surface 311 and the second guide surface 312, so that the entire guide 31 does not have protrusions or other structures that affect the transport of the paper 200. In addition, guide rollers (not shown in the figure) can be arranged near the first guide surface 311 and the second guide surface 312 to assist in driving the flipping of the paper 200.

[0084] Of course, the structure of the guide mechanism 30 in this embodiment is not limited to this. For example, the guide mechanism 30 can also be a channel or a paper conveying structure formed entirely by two rows of rotating rollers. This embodiment will not list them all.

[0085] Referring again to Figures 1 and 2, in some examples, the first conveying mechanism 10 may optionally include a first straightening roller assembly 11 and a first paper discharge roller assembly 12 arranged sequentially along a first direction X.

[0086] Along the first direction X, the first imaging component 22 of this embodiment is located between the first correcting roller component 11 and the first paper output roller component 12, and the first paper output roller component 12 is located between the first fixing component 23 and the guide mechanism 30.

[0087] The first straightening roller assembly 11 may include one or two rollers, with a space between the two rollers for clamping and conveying the paper 200, and the conveying direction of the paper 200 can be limited to prevent the paper 200 from being misaligned in the width direction.

[0088] The first row of paper rollers may also include one or two rollers. The first row of paper rollers is used to discharge the paper 200 from the first conveying mechanism 10 of this embodiment and to move the paper 200 toward the guide mechanism 30 of this embodiment.

[0089] Similarly, the second conveying mechanism 40 in this embodiment may include a second straightening roller assembly 41 and a second paper roll assembly 42 arranged sequentially along the second direction Y. The second straightening roller assembly 41 is used to limit the conveying direction of the paper 200 to avoid the paper 200 from being misaligned in the width direction.

[0090] The second imaging component 52 is located between the second correcting roller assembly 41 and the second paper feed roller assembly 42. The second correcting roller assembly 41 is located between the guide mechanism 30 and the second imaging component 52. The second paper feed roller assembly 42 may be located near the paper outlet and is used to discharge the printed paper 200 out of the body of the duplex printer 100 of this embodiment.

[0091] Of course, the structure of the first conveying mechanism 10 and the second conveying mechanism 40 in this embodiment is not limited to this. For example, the first conveying mechanism 10 and the second conveying mechanism 40 may also include other conveying roller structures.

[0092] In addition, the duplex printer 100 of this embodiment may also include a toner supply roller, a developing blade, a cleaning roller, and a charging roller (not shown in the figure). The toner supply roller is used to provide toner to the imaging components such as the first imaging component 22 and the second imaging component 52 of this embodiment. The developing blade and the cleaning roller are used to perform developing processes. The charging roller is used to charge the imaging components such as the first imaging component 22 and the second imaging component 52. The number of toner supply rollers, cleaning rollers, and charging rollers can be one or more, so as to match the number of imaging components.

[0093] Since the structures of the toner supply roller, developing blade, cleaning roller, and charging roller of the laser printer are well known to those skilled in the art, this embodiment will not describe the above structures or structures not mentioned in the laser printer (such as the housing). Those skilled in the art can refer to the relevant technology for understanding.

[0094] Referring again to Figures 1 and 2, the specific working process of the duplex printer 100 in this embodiment will now be described:

[0095] The paper 200 is first corrected by the first correction roller assembly 11, and then conveyed to the first imaging assembly 22 of this embodiment for imaging of the upward-facing first surface 210. The specific imaging process is realized by the first laser scanning unit 21, the first photosensitive drum 221 and the first transfer roller 222 mentioned above.

[0096] After the first surface 210 is imaged, it is heated and developed by the first heating roller 231 and the first pressure roller 232 of the first developing assembly, and then conveyed to the guiding mechanism 30 for flipping by the first paper roll assembly 12.

[0097] The second surface 220 of the flipped paper 200 is imaged and enters the second correction roller assembly 41 for correction. Subsequently, the second surface 220 is imaged by the second laser scanning unit 51, the second photosensitive drum 521 and the second transfer roller 522.

[0098] After the second surface 220 is imaged, it is heated and developed by the second heating roller 531 and the second pressure roller 532 of the second developing assembly in this embodiment, and finally discharged through the second paper discharge roller assembly 42.

[0099] The above description is merely a preferred embodiment of the present invention. Those skilled in the art should understand that the scope of disclosure in this invention is not limited to the specific combination of the above-described technical features, but should also cover other technical solutions formed by any combination of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. A duplex printer, characterized in that, include: A first conveying mechanism is used to convey paper along a first direction, the paper having opposite first and second surfaces, with the first surface of the paper located in the first conveying mechanism facing upwards; A first printing mechanism is used to print the first surface; A guiding mechanism is used to receive the paper after it has been imaged on the first surface and to flip the paper so that the second surface is facing upwards. The second conveying mechanism is used to receive the paper after it has been flipped by the guiding mechanism, and to convey the paper in a second direction opposite to the first direction. as well as The second printing mechanism is used to print the second surface.

2. The duplex printer according to claim 1, characterized in that, The first printing mechanism includes a first laser scanning unit and a first imaging component. The first laser scanning unit is located above the first conveying mechanism and is disposed facing the first surface. The first imaging component is used to receive the laser from the first laser scanning unit and form an image on the first surface. And / or, the second printing mechanism includes a second laser scanning unit and a second imaging component, the second laser scanning unit being located above the second conveying mechanism and facing the second surface, and the second imaging component being used to receive the laser from the second laser scanning unit and form an image on the second surface.

3. The duplex printer according to claim 2, characterized in that, The first imaging component includes a first photosensitive drum and a first transfer roller, wherein the first photosensitive drum is located below the first laser scanning unit and the first transfer roller is located below the first photosensitive drum.

4. The duplex printer according to claim 2, characterized in that, The second imaging component includes a second photosensitive drum and a second transfer roller, with the second photosensitive drum located below the second laser scanning unit and the second transfer roller located below the second photosensitive drum.

5. The duplex printer according to claim 2, characterized in that, The first imaging component and the second imaging component are arranged at intervals in a vertical direction, and at least a portion of the guide mechanism is located between the first imaging component and the second imaging component.

6. The duplex printer according to claim 5, characterized in that, The first imaging component is located below the second imaging component, and the first laser scanning unit is located between the first imaging component and the second imaging component.

7. The duplex printer according to claim 2, characterized in that, The first printing mechanism further includes a first fixing component, which is located between the first imaging component and the guiding mechanism. The first fixing component acts to fix the first surface after the first imaging. And / or, the second printing mechanism further includes a second fixing component, which acts to fix the second surface after the second imaging.

8. The duplex printer according to any one of claims 2-7, characterized in that, The guiding mechanism includes a guide member, which includes a first guide surface and a second guide surface connected to each other. The first guide surface is used to receive the paper after the first surface is imaged and to flip the paper at a first angle. The second guide surface is used to receive the paper flipped at the first angle and to flip the paper at a second angle so that the second surface of the paper faces upward.

9. The duplex printer according to claim 8, characterized in that, The first guide surface is arranged vertically, the second guide surface is arranged horizontally, and the junction of the first guide surface and the second guide surface is rounded.

10. The duplex printer according to any one of claims 2-7, characterized in that, The first conveying mechanism includes a first straightening roller assembly and a first paper discharge roller assembly arranged sequentially along the first direction. The first imaging assembly is located between the first straightening roller assembly and the first paper discharge roller assembly. The first straightening roller assembly is used to receive and straighten the conveyed paper, and the first paper discharge roller assembly is used to convey the paper to the guiding mechanism. And / or, the second conveying mechanism includes a second correcting roller assembly and a second paper feed roller assembly arranged sequentially along the second direction, the second imaging assembly being located between the second correcting roller assembly and the second paper feed roller assembly, the second correcting roller assembly being used to receive and correct the paper after it has been flipped, and the first paper feed roller assembly being used to convey the paper to the outside of the duplex printer.

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