Document identification double-sided printer

Abstract

The document identification double-sided printer is characterized in that the document identification double-sided printer comprises a rack, the rack is provided with an inlet end and an outlet end, and a first printing assembly, a second printing assembly and a transmission assembly are arranged between the inlet end and the outlet end; the transmission assembly imports a document from the inlet end, firstly feeds the document into the first printing assembly for printing, then overturns the document, feeds the document into the second printing assembly for printing, and exports the document from the outlet end; by the adoption of the technical scheme, the document does not need to be turned manually, double-face identification is completed directly through linkage of the transmission assembly and the double-printing assembly, batch processing time is greatly shortened, the problems of page number dislocation (such as disordered odd-even page sequence), missing printing, reprinting and the like possibly occurring when the document is turned manually are thoroughly solved, continuous page numbers and uniform double-face positions are ensured, and the efficiency of processing the document is improved. And the requirement of archive management on identification standardability is met.

Description

Technical Field

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

[0002] When managing archived documents / files, existing documents need to be identified, such as by setting page numbers and headers, to enhance the document's logical structure and readability, making the content traceable and organized. Headers typically include document titles, chapter names, author information, etc., used to define the content scope of the page; page numbers are used to indicate page order, facilitating content location.

[0003] Existing technologies for document identification involve using metal number stamps or date stamps, along with ink, to affix page numbers (e.g., "1", "2") or category identifiers (e.g., "Personnel-2025") to designated locations on the paper. During use, the bottom of the stamp needs to be pressed against the area where the identification is to be created. Uneven pressure can lead to incomplete identification, affecting print quality. Furthermore, document identification relies entirely on manual adjustment. The subjectivity and inaccuracy of manual operation can cause misalignment or errors in the identification position, impacting the overall quality and professionalism of the paper document. Manual adjustment also requires additional time and effort, especially for large batches of documents. Additionally, the document identification at the bottom of the metal number stamp or date stamp is fixed, making customization impossible.

[0004] To address the aforementioned issues, patent authorization number CN221457108U, entitled "A Page Number Printer," provides a printer comprising a worktable, a printing unit, and a display control unit. The printing unit is suspended above one side of the worktable's end face; the display control unit is electrically connected to the printing unit. In use, a paper document is placed on the end face of the worktable and inserted into the bottom of the printing unit, which then numbers the document. While this technical solution can complete the page numbering of paper documents, it can only handle single-sided documents. For double-sided documents, the document must be manually removed from the worktable, the pages manually flipped, and then repositioned under the printing unit for secondary numbering. This operation not only reduces the efficiency of document numbering but may also lead to misaligned page numbers due to manual flipping (e.g., disordered page numbering between odd and even pages). This is particularly problematic when handling thick documents or batch archiving, easily resulting in missed prints and duplicates, failing to meet the requirements for continuous and standardized document numbering in archival management. Summary of the Invention

[0005] In view of the above problems, the present invention provides a document label duplex printer to solve the problem that existing label printers cannot achieve duplex printing.

[0006] To achieve the above objectives, the inventors provide a document identification duplex printer, which includes a frame having an inlet end and an outlet end, and a first printing component, a second printing component, and a transmission component are provided between the inlet end and the outlet end;

[0007] The first printing component is used to print the first side of the document to print an identifier on the first side of the document;

[0008] The second printing component is used to print the second side of the document to print the identification on the second side of the document;

[0009] The transmission component imports the document from the inlet, first sends it to the first printing component for printing, then flips the document and sends it to the second printing component for printing, and finally exports it from the outlet.

[0010] It also includes a worktable, which is set corresponding to the inlet end, and a lifting structure is provided between the worktable and the frame so that the document placed on the worktable is at the same horizontal plane as the inlet end, and is imported from the inlet end through the transmission component.

[0011] Furthermore, it also includes a first horizontal adjustment device corresponding to the first printing component and a second horizontal adjustment device corresponding to the second printing component;

[0012] The first leveling device includes a first guide rod arranged horizontally on the frame, and the first printing assembly is slidably connected to the first guide rod to adjust the position of the first printing assembly printing the mark on the first side of the document;

[0013] The second leveling device includes a second guide rod disposed on the frame in a horizontal direction, and the second printing assembly is slidably connected to the second guide rod to adjust the position of the printing mark on the second side of the document.

[0014] Furthermore, the first leveling device also includes a first tightening screw, and the first printing component is provided with a first screw hole that matches the first tightening screw corresponding to the first guide rod. The first tightening screw is threadedly connected to the first screw hole so that the first printing component is fastened to the first guide rod.

[0015] The second leveling device further includes a second tightening screw, and the second printing component is provided with a second screw hole that matches the second tightening screw corresponding to the second guide rod. The second tightening screw is threadedly connected to the second screw hole to fasten the second printing component onto the second guide rod.

[0016] Furthermore, the first printing component includes a first fixing part, a first print head, a first abutting part, and a first height adjustment device; the first fixing part is slidably connected to a first guide rod; the first print head is connected to the first fixing part, the first abutting part is correspondingly disposed below the first print head, and the first height adjustment device adjusts the distance between the first print head and the first abutting part;

[0017] The second printing assembly includes a second fixing part, a second print head, a second abutment part, and a second height adjustment device; the second fixing part is slidably connected to a second guide rod; the second print head is connected to the second fixing part, the second abutment part is correspondingly located below the second print head, and the second height adjustment device adjusts the distance between the second print head and the second abutment part.

[0018] Furthermore, the first height adjustment device includes a third tightening screw, and the first fixing part is provided with a third screw hole that matches the third tightening screw corresponding to the first print head. The third tightening screw is threadedly connected to the third screw hole so that the first print head is connected to the first fixing part to adjust the distance between the first print head and the first contact part.

[0019] The second height adjustment device includes a fourth tightening screw. The second fixing part is provided with a fourth screw hole that matches the fourth tightening screw, corresponding to the second print head. The fourth tightening screw and the fourth screw hole are threadedly connected to connect the second print head to the second fixing part to adjust the distance between the second print head and the second abutment part.

[0020] Furthermore, the first fixing part is provided with at least one first oblong hole corresponding to the first print head, and the first print head is provided with a first positioning rod corresponding to the first oblong hole; the first positioning rod is slidably connected to the first oblong hole.

[0021] The second fixing part is provided with at least one second oblong hole corresponding to the second print head, and the second print head is provided with a second positioning rod corresponding to the second oblong hole; the second positioning rod is slidably connected to the second oblong hole.

[0022] Furthermore, the transmission assembly includes at least one set of transmission rollers, the transmission roller set including an active roller and a passive roller, the active roller being rotatably connected to the frame, and the passive roller being detachably rotatably connected to the frame and abutting against the active roller.

[0023] Furthermore, the frame is provided with a support for the passive roller, and the passive roller is rotatably connected to the support; one end of the support is rotatably connected to the frame, and the other end of the support is hung on the frame by a hook so that the passive roller abuts against the active roller.

[0024] Furthermore, the lifting structure includes a conveyor belt, the conveyor belt and the corresponding worktable are mounted on the frame along the lifting direction, the worktable is provided with a fixing ear corresponding to the conveyor belt, the fixing ear is fixed on the conveyor belt, so as to drive the lifting of the worktable relative to the frame through the movement of the conveyor belt.

[0025] Furthermore, it also includes a display control unit, which is electrically connected to the first print head of the first printing assembly and the second print head of the second printing assembly, respectively.

[0026] Unlike existing technologies, the above technical solution supports double-sided printing of documents without the need for manual document flipping. Double-sided labeling is completed directly through the linkage of the transmission component and the dual printing component, significantly shortening batch processing time and completely resolving issues such as page number misalignment (e.g., disordered odd / even page order), missed printing, and reprinting that may occur when manually flipping documents. This ensures continuous page numbering and consistent double-sided positioning, meeting the requirements of document management for standardized labeling. Simultaneously, a document placement platform is set up. Through a lifting structure between the platform and the rack, documents placed on the platform are at the same level as the import end. Whether it's a single-page document or a heavy archive, operators do not need to lift the document to the import end; they only need to place the document on the platform, and the transmission component can import it from the import end by raising and lowering the platform. This greatly improves the stability of document transmission and reduces problems such as paper jams and skewing caused by height differences.

[0027] The above description of the invention is merely an overview of the technical solution of the present invention. In order to enable those skilled in the art to better understand the technical solution of the present invention and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of the present invention easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of the present invention. Attached Figure Description

[0028] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of the present invention and other related contents, and should not be considered as limitations on the present invention.

[0029] In the accompanying drawings of the instruction manual:

[0030] Figure 1 This is a schematic diagram of the document identification duplex printer described in a specific embodiment;

[0031] Figure 2 This is a schematic diagram of the structure of the first printing component in a specific implementation method;

[0032] Figure 3 This is a schematic diagram of the structure of the second printing component in a specific implementation method;

[0033] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0034] Figure 5 This is a schematic diagram of the workbench structure described in a specific embodiment;

[0035] Figure 6 This is a structural diagram of the document identification duplex printer described in a specific embodiment.

[0036] The reference numerals used in the above figures are explained as follows:

[0037] 10. Rack;

[0038] 101. Import end; 102. Export end; 103. Support; 104. Hook;

[0039] 20. First printing component;

[0040] 201. First fixing part;

[0041] 2011, First oblong hole;

[0042] 202. First printhead;

[0043] 2021, First positioning rod;

[0044] 203. First contact point;

[0045] 204. First level adjustment device;

[0046] 2041, First tightening screw; 2042, First guide rod;

[0047] 205. First height adjustment device;

[0048] 2051, Third tightening screw;

[0049] 30. Second printing component;

[0050] 301. Second fixing part;

[0051] 3011, Second oblong hole;

[0052] 302. Second printhead;

[0053] 3021, Second positioning rod;

[0054] 303. Second contact section;

[0055] 304. Second level adjustment device;

[0056] 3041, Second tightening screw; 3042, Second guide rod;

[0057] 305. Second height adjustment device;

[0058] 3051, Fourth tightening screw;

[0059] 40. Transmission components;

[0060] 401. Driven roller; 402. Passive roller;

[0061] 50. Workbench;

[0062] 501. Fixed ear;

[0063] 502. Lifting structure;

[0064] 5021, Conveyor belt;

[0065] 60. Display control unit;

[0066] 70. Outer shell;

[0067] 701. Inspection window. Detailed Implementation

[0068] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this invention in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this invention and are therefore intended only as examples, not as limiting the scope of protection of this invention.

[0069] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this invention, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0070] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0071] In the description of this invention, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0072] In this invention, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0073] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0074] Similar to the understanding in the Examination Guidelines, in this invention, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this invention, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0075] In the description of the embodiments of the present invention, the spatial related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of the present invention or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0076] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this invention, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention according to the specific circumstances.

[0077] See Figures 1-6 As shown, a document labeling duplex printer is suitable for scenarios with high document labeling requirements, such as government archives management, financial contract archiving, and library cataloging. It is particularly suitable for labeling existing documents during archive / record management. It includes a first printing component 20, a second printing component 30, and a transmission component 40. The first printing component 20 is used to print the label on the first side of the document, and the second printing component 30 is used to print the label on the second side of the document, supporting duplex printing. It eliminates the need for manual document flipping; the duplex labeling is completed directly through the transmission component 40 in conjunction with the dual printing components, significantly shortening batch processing time and completely resolving issues such as page number misalignment (e.g., disordered odd / even page order), missed printing, and reprinting that may occur when manually flipping documents. It ensures continuous page numbering and consistent page position on both sides, meeting the requirements of archive management. The document is placed on a workbench 50, which is designed to meet the requirements for standardized labeling. The workbench 50 and the rack 10 are connected by a lifting structure, ensuring that documents placed on the workbench 50 are at the same level as the import end 101. Whether it's a single-page document or a heavy archive, operators do not need to lift the document to the import end 101. The document is simply placed on the workbench 50, and the document is imported from the import end 101 via the transmission component 40 by raising and lowering the workbench 50. This greatly improves the stability of document transmission and reduces problems such as paper jams and skewing caused by height differences.

[0078] See Figure 1 As shown, the following is an embodiment of a document identification duplex printer, which includes a frame 10, the frame 10 having an inlet end 101 and an outlet end 102, and a first printing component 20, a second printing component 30, and a transmission component 40 disposed between the inlet end 101 and the outlet end 102.

[0079] The first printing component 20 is used to print the first side of the document to print an identifier on the first side of the document;

[0080] The second printing component 30 is used to print the second side of the document to print an identifier on the second side of the document;

[0081] The transmission component 40 imports the document from the inlet 101, first sends it to the first printing component 20 for printing, then flips the document and sends it to the second printing component 30 for printing, and exports it from the outlet 102.

[0082] It also includes a workbench 50, which is set corresponding to the inlet end 101, and a lifting structure 502 is provided between the workbench 50 and the frame 10 so that the document placed on the workbench 50 is at the same horizontal plane as the inlet end 101 and is imported from the inlet end 101 through the transmission component 40.

[0083] The aforementioned identifiers include elements such as page numbers and headers, which enhance the document's logical structure and reading coherence, giving the document's content traceability and organization. The header can be one or a combination of document titles, chapter names, author information, etc., to define the content category of the page; the page numbers can be used to indicate page order for easy content location.

[0084] The aforementioned workbench 50 includes a plane with a certain height, and the plane has sufficient width and length to accommodate paper documents.

[0085] The first printing component 20 and the second printing component 30 described above can be fixedly installed to meet the standardized double-sided printing requirements of regular documents. During fixed installation, the first printing component 20 and the second printing component 30 can be set relative to each other or offset, ensuring that the markings are printed in the preset positions on the regular document through preset mechanical positioning. See also... Figure 2-3 As shown, the first printing component 20 and the second printing component 30 can also be movably configured to meet diverse and personalized printing needs, adapting to documents of different sizes (such as B5, custom sizes) or with special layout requirements. For example, when processing ancient book restoration or irregularly shaped drawings, the positions of the first printing component 20 and the second printing component 30 can be adjusted to ensure that the markings are printed in the designated area. Specifically, the document marking duplex printer also includes a first horizontal adjustment device 204 corresponding to the first printing component 20 and a second horizontal adjustment device 304 corresponding to the second printing component 30; the positions of the first printing component 20 and the second printing component 30 are adjusted by the first horizontal adjustment device 204 and the second horizontal adjustment device 304 respectively to ensure that the markings are printed in the designated area.

[0086] In some embodiments, the first horizontal adjustment device 204 and the second horizontal adjustment device 304 can be screw and nut driven adjustment devices, with a screw, guide rail, and motor respectively provided for each printing component. The printing component is slidably connected to the guide rail; at the same time, the screw is threadedly connected to the printing component, and the motor drives the screw to rotate through a coupling. After receiving a control signal, the motor rotates the screw, and the printing component moves linearly along the guide rail to adjust the position of the printing component.

[0087] In some embodiments, the first horizontal adjustment device 204 and the second horizontal adjustment device 304 may be an electric push rod and a guide rail; one end of the electric push rod is fixed to the frame 10, and the other end is connected to the printing assembly; the guide rail provides guidance to prevent lateral displacement when the push rod moves. By driving the electric push rod to extend and retract, the printing assembly is moved horizontally to adjust the position of the printing assembly.

[0088] See Figure 2-3As shown, in some embodiments, the first leveling device 204 includes a first guide rod 2042 arranged horizontally on the frame 10, and the first printing assembly 20 is slidably connected to the first guide rod 2042 to adjust the position of the first printing assembly 20 printing the mark on the first side of the document; the second leveling device 304 includes a second guide rod 3042 arranged horizontally, and the second printing assembly 30 is slidably connected to the second guide rod 3042 to adjust the position of the second printing assembly 30 printing the mark on the second side of the document. By manually adjusting the position of the first printing assembly 20 on the first guide rod 2042 and the position of the second printing assembly 30 on the second guide rod 3042, it is ensured that the mark is printed in the designated area. Of course, the first leveling device 204 may also include a first tightening screw 2041. The first printing component 20 has a first screw hole corresponding to the first guide rod 2042 that matches the first tightening screw 2041. The first tightening screw 2041 is threadedly connected to the first screw hole to fasten the first printing component 20 to the first guide rod 2042. That is, the first printing component 20 slides to a suitable position on the first guide rod 2042, and the first tightening screw threadedly connects to the first screw hole to fasten the first printing component 20 to the first guide rod 2042. Similarly, the second leveling device 304 also includes a second tightening screw 3041 arranged horizontally on the frame 10. The second printing component 30 has a second screw hole corresponding to the second guide rod 3042 that matches the second tightening screw 3041. The second tightening screw 3041 is threadedly connected to the second screw hole to fasten the second printing component 30 to the second guide rod 3042. The second printing component 30 is slid to a suitable position on the second guide rod 3042, and then fastened to the second guide rod 3042 by connecting the second tightening screw thread to the second screw hole. Preferably, corresponding scales are set on the first guide rod 2042 and the second guide rod 3042 to achieve adjustment accuracy.

[0089] See Figure 2As shown, the first printing component 20 is used to print the first side of a document to print an identifier on the first side of the document. Specifically, the first printing component 20 includes a first fixing part 201, a first print head 202, a first abutting part 203, and a first height adjustment device 205. The first fixing part 201 is used to fix the first print head 202 so that the first print head 202 is connected to the frame 10. Taking the first printing component 20 and the first guide rod 2042 as an example, the first fixing part 201 and the first guide rod 2042 are slidably connected. The first print head 202 is connected to the first fixing part 201, the first abutting part 203 is correspondingly disposed below the print head, and the first height adjustment device 205 adjusts the distance between the first print head 202 and the first abutting part 203. This allows the first print head 202 to maintain the optimal working distance from the document surface by adjusting the distance between the first print head 202 and the first abutting part 203 when processing documents of different thicknesses. At the same time, it also allows the first printing component 20 to not participate in the printing work.

[0090] See Figure 3 As shown, the second printing component 30 is used to print the second side of a document to print markings on the second side. Specifically, the second printing component 30 includes a second fixing part 301, a second print head 302, a second abutment part 303, and a second height adjustment device 305. The second fixing part 301 is used to fix the second print head 302 so that the second print head 302 is connected to the frame 10. Taking the second printing component 30 and the second guide rod 3042 as an example, the second fixing part 301 and the second guide rod 3042 are slidably connected. The second print head 302 is connected to the second fixing part 301, the second abutment part 303 is correspondingly located below the second print head 302, and the second height adjustment device 305 adjusts the distance between the second print head 302 and the second abutment part 303. This allows for the adjustment of the distance between the second print head 302 and the document surface to maintain the optimal working distance when processing documents of different thicknesses. Simultaneously, it also allows the second printing component 30 to not participate in the printing process.

[0091] The first printhead 202 and the second printhead 302 mentioned above can be any type of printhead, such as inkjet, laser, or thermal.

[0092] The aforementioned first height adjustment device 205 and second height adjustment device 305 can be electric push rod lifting adjustment devices, worm gear transmission adjustment devices, pneumatic lifting adjustment devices, etc. See also Figure 2As shown, in some embodiments, the first height adjustment device 205 includes a third tightening screw 2051. The first fixing part 201 is provided with a third screw hole corresponding to the first print head 202, which matches the third tightening screw 2051. The third tightening screw 2051 is threadedly connected to the third screw hole, so that the first print head 202 is connected to the first fixing part 201 to adjust the distance between the first print head 202 and the first abutment part 203; see also Figure 3 As shown, the second height adjustment device 305 includes a fourth tightening screw 3051. The second fixing part 301 has a fourth screw hole corresponding to the second print head 302, which matches the fourth tightening screw 3051. The fourth tightening screw 3051 is threadedly connected to the fourth screw hole, so that the second print head 302 is connected to the second fixing part 301 to adjust the distance between the second print head 302 and the second abutment part 303. Preferably, the first fixing part 201 has at least one first oblong hole 2011 corresponding to the first print head 202, and the first print head 202 has a corresponding first positioning rod 2021 corresponding to the first oblong hole 2011; the first positioning rod 2021 is slidably connected to the first oblong hole 2011. Similarly, the second fixing part 301 has at least one second oblong hole 3011 corresponding to the second print head 302, and the second print head 302 has a corresponding second positioning rod 3021 corresponding to the second oblong hole 3011; the second positioning rod 3021 is slidably connected to the second oblong hole 3011. The engagement between the positioning rod and the oblong hole provides clear installation guidance, preventing issues such as incorrect orientation when adjusting the distance between the print head and the contact part.

[0093] See Figure 4As shown, the aforementioned transmission assembly 40 is used for document transmission. It includes several sets of transmission rollers, each comprising an active roller 401 and a passive roller 402. The active roller 401 is rotatably connected to the frame 10, and the passive roller 402 is detachably rotatably connected to the frame 10 and abuts against the active roller 401. The shaft end of the active roller 401 extends to the outside of the frame 10 and is driven by a servo motor or stepper motor. Under the drive, the active roller 401 rotates at a constant speed, driving the abutting passive roller 402 to rotate synchronously through friction, thus generating transmission power. When a document enters the transmission roller set, the active roller 401 and the passive roller 402 clamp and pull the document forward, realizing document transmission. The passive roller 402 is detachably rotatably connected to the frame 10. When a paper jam is detected (such as a sudden pressure change or transmission stagnation), the active roller 401 and the passive roller 402 can be quickly separated, and the document can be quickly removed. This avoids tearing, wrinkling, or ink contamination of the document due to forced pulling, maximizing the protection of document integrity. In some embodiments, the passive roller 402 has a cylindrical shaft end with a slot, and a corresponding elastic latching arm is provided on the frame 10. During installation, the slot on the shaft end of the passive roller 402 is aligned with the latching arm, and after pressing it into place, the latching arm automatically engages with the slot to achieve circumferential fixation. During disassembly, the latching arm is popped up by pressing the unlock button, allowing the passive roller 402 to be pulled out. In some embodiments, the frame 10 has a support 103 corresponding to the passive roller 402, and the passive roller 402 is rotatably connected to the support 103. One end of the support 103 is rotatably connected to the frame 10, and the other end of the support 103 is hung on the frame 10 via a hook 104, so that the passive roller 402 abuts against the active roller 401. When the hook 104 is hung on the frame 10, the passive roller 402 abuts against the active roller 401; when the hook 104 is separated from the frame 10, the passive roller 402 separates from the active roller 401.

[0094] The aforementioned lifting structure 502 ensures that documents placed on the worktable 50 are at the same horizontal level as the inlet end 101, and are imported from the inlet end 101 via the transmission component 40. In some embodiments, the lifting structure adopts a combination of an electric push rod and a slide rail, using a servo motor to drive a lead screw and nut mechanism to achieve precise vertical lifting of the worktable 50. When the device is in standby mode, the worktable 50 is lowered to a low position, making it easy for operators to place heavy or large quantities of documents; when work begins, the control system automatically raises the worktable 50, precisely aligning the documents with the inlet end 101 of the transmission component 40, ensuring a smooth and stable transfer of documents onto the transmission component 40. See also Figure 5As shown, in some embodiments, the lifting structure 502 includes a conveyor belt 5021. The conveyor belt 5021 is mounted on the frame 10 along the lifting direction, corresponding to the worktable 50. The worktable 50 is provided with a fixing ear 501 corresponding to the conveyor belt 5021. The fixing ear 501 is fixed to the conveyor belt 5021, so that the worktable 50 can be lifted or lowered relative to the frame 10 by the movement of the conveyor belt 5021. Of course, the above-mentioned lifting structure can also be equipped with a laser rangefinder sensor to monitor the document height in real time. When it is detected that the document and the inlet end 101 are not at the same horizontal height, the lifting structure 502 is activated to raise or lower the worktable 50, so as to avoid document jamming or damage caused by the inconsistent horizontal height between the document and the inlet end 101.

[0095] See Figure 6 As shown, in some embodiments, a display control unit 60 is also included. The display control unit 60 is electrically connected to the first print head 202 of the first printing assembly 20 and the second print head 302 of the second printing assembly 30, respectively. The display control unit 60 is electrically connected to the aforementioned sensors, motor, first print head 202, and second print head 302, and is used to set the parameters of the identifier (such as page number type (e.g., 1-1, or A1, etc.), size, character type, etc.), and can also be used to display the information of the currently printed identifier. By setting the identifier type, size, etc., on the display control unit 60, the customized identifier can be created. Then, the document is placed on the end face of the workbench 50, and transmitted to the first printing assembly 20 and second printing assembly 30 via the transmission assembly 40 to print the identifier, thus completing the page numbering of the paper document and effectively improving the efficiency of page numbering. At the same time, there are no quality requirements for the paper document, ensuring its integrity. The display control unit 60 can be directly installed on the printer or can be a mobile phone, electrically connected wirelessly to the sensors, motor, first print head 202, and second print head 302, etc. The display control unit 60 may be a display screen for setting page numbers controlled by buttons or knobs, or an LCD screen with touch function for setting page numbers, etc.

[0096] See Figure 6 As shown, in some embodiments, a housing 70 is also included, and a maintenance window 701 is provided at the position where the passive roller 402 is detachably and rotatably connected to the frame 10. When the sensor detects a paper jam signal, the paper jam can be removed by separating the passive roller 402 from the active roller 401 through the maintenance window 701 using the disassembly structure of the passive roller 402, thus avoiding document tearing due to prolonged jamming.

[0097] In some embodiments, a double-sheet detection function is also included. This is achieved by setting an ultrasonic sensor during the paper feeding process, such as adding an ultrasonic sensor on the right side of the paper path after the first printhead. The ultrasonic sensor detects whether there is a double-sheet, i.e. multiple sheets of paper are stacked together. The system can then pause and prompt the user, waiting for the user to clean up before resuming printing.

[0098] Finally, it should be noted that although the above embodiments have been described in the description and drawings of this invention, this should not limit the scope of patent protection of this invention. Any technical solutions that are based on the essential concept of this invention, utilize the content described in the description and drawings of this invention to make equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this invention.

Claims

1. A document identification duplex printer, characterized in that, The machine includes a frame having an inlet end and an outlet end, and a first printing component, a second printing component, and a transmission component are provided between the inlet end and the outlet end; The first printing component is used to print the first side of the document to print an identifier on the first side of the document; The second printing component is used to print the second side of the document to print the identification on the second side of the document; The transmission component imports the document from the inlet, first sends it to the first printing component for printing, then flips the document and sends it to the second printing component for printing, and finally exports it from the outlet. It also includes a worktable, which is set corresponding to the inlet end, and a lifting structure is provided between the worktable and the frame so that the document placed on the worktable is at the same horizontal plane as the inlet end, and is imported from the inlet end through the transmission component.

2. The document identification duplex printer according to claim 1, characterized in that, It also includes a first horizontal adjustment device corresponding to the first printing component and a second horizontal adjustment device corresponding to the second printing component; The first leveling device includes a first guide rod arranged horizontally on the frame, and the first printing assembly is slidably connected to the first guide rod to adjust the position of the first printing assembly printing the mark on the first side of the document; The second leveling device includes a second guide rod disposed on the frame in a horizontal direction, and the second printing assembly is slidably connected to the second guide rod to adjust the position of the printing mark on the second side of the document.

3. The document identification duplex printer according to claim 2, characterized in that, The first leveling device further includes a first tightening screw, and the first printing component is provided with a first screw hole that matches the first tightening screw corresponding to the first guide rod. The first tightening screw is threadedly connected to the first screw hole so that the first printing component is fastened to the first guide rod. The second leveling device further includes a second tightening screw, and the second printing component is provided with a second screw hole that matches the second tightening screw corresponding to the second guide rod. The second tightening screw is threadedly connected to the second screw hole to fasten the second printing component onto the second guide rod.

4. The document identification duplex printer according to claim 2, characterized in that, The first printing assembly includes a first fixing part, a first print head, a first abutting part, and a first height adjustment device; the first fixing part is slidably connected to a first guide rod; the first print head is connected to the first fixing part, the first abutting part is correspondingly disposed below the first print head, and the first height adjustment device adjusts the distance between the first print head and the first abutting part; The second printing assembly includes a second fixing part, a second print head, a second abutment part, and a second height adjustment device; the second fixing part is slidably connected to a second guide rod; the second print head is connected to the second fixing part, the second abutment part is correspondingly located below the second print head, and the second height adjustment device adjusts the distance between the second print head and the second abutment part.

5. The document identification duplex printer according to claim 4, characterized in that, The first height adjustment device includes a third tightening screw, and the first fixing part is provided with a third screw hole that matches the third tightening screw corresponding to the first print head. The third tightening screw is threadedly connected to the third screw hole so that the first print head is connected to the first fixing part to adjust the distance between the first print head and the first abutment part. The second height adjustment device includes a fourth tightening screw. The second fixing part is provided with a fourth screw hole that matches the fourth tightening screw, corresponding to the second print head. The fourth tightening screw and the fourth screw hole are threadedly connected to connect the second print head to the second fixing part to adjust the distance between the second print head and the second abutment part.

6. The document identification duplex printer according to claim 5, characterized in that, The first fixing part is provided with at least one first oblong hole corresponding to the first print head, and the first print head is provided with a first positioning rod corresponding to the first oblong hole; the first positioning rod is slidably connected to the first oblong hole; The second fixing part is provided with at least one second oblong hole corresponding to the second print head, and the second print head is provided with a second positioning rod corresponding to the second oblong hole; the second positioning rod is slidably connected to the second oblong hole.

7. The document identification duplex printer according to claim 1, characterized in that, The transmission assembly includes at least one set of transmission rollers, which includes an active roller and a passive roller. The active roller is rotatably connected to the frame, and the passive roller is detachably rotatably connected to the frame and abuts against the active roller.

8. The document identification duplex printer according to claim 7, characterized in that, The frame is provided with a support for the passive roller, and the passive roller is rotatably connected to the support; one end of the support is rotatably connected to the frame, and the other end of the support is hung on the frame by a hook so that the passive roller abuts against the active roller.

9. The document identification duplex printer according to claim 1, characterized in that, The lifting structure includes a conveyor belt, and the worktable corresponding to the conveyor belt is mounted on the frame along the lifting direction. The worktable is provided with a fixing ear corresponding to the conveyor belt, and the fixing ear is fixed on the conveyor belt so as to drive the lifting of the worktable relative to the frame through the movement of the conveyor belt.

10. The document identification duplex printer according to claim 1, characterized in that, It also includes a display control unit, which is electrically connected to the first printhead of the first printing assembly and the second printhead of the second printing assembly, respectively.

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