Paper conveying device

Abstract

The utility model relates to a paper conveying device which comprises a bottom plate, a cover plate, a paper feeding roller set and a centering assembly. The bottom plate and the cover plate are oppositely arranged, and a paper feeding channel is formed between the inner side face of the bottom plate and the inner side face of the cover plate. A centering area is further arranged on the inner side face of the bottom plate, and paper can move to the centering area from an outlet of the paper feeding channel. A plurality of paper feeding openings are formed in the bottom plate and the cover plate in a penetrating mode, and the paper feeding roller sets are located at the paper feeding openings. The centering assembly comprises two centering clamping plates which are oppositely arranged, the centering clamping plates are installed on the centering area of the bottom plate in a sliding mode, and the two centering clamping plates can be synchronously close to each other to adjust the position of paper. According to the utility model, the two centering clamping plates synchronously move from the initial positions and are close to each other, so that the position of paper is adjusted, when the paper enters the printer for double-sided printing, the relative position of the paper and the printer is determined and does not deviate, and the condition that the printed contents on the front and back sides of the paper are not aligned is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of printers, in particular to a paper conveying device. Background Art

[0002] When a printer is working, since the paper is easily affected by uncontrollable forces during the conveying process, it will deviate horizontally from the original preset reference line, showing a certain horizontal offset. As a result, when printing on both sides, the printed content is prone to misalignment. Therefore, there is an urgent need for a conveying mechanism that can correct the position of the paper movement. Summary of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] The utility model provides a paper conveying device, aiming to solve the problem that the paper is prone to deviation when the printer prints on both sides of the paper in the prior art.

[0005] (2) Technical Solutions

[0006] To solve the above problems, the utility model provides a paper conveying device, which includes: a bottom plate, a cover plate, a paper feeding roller group and a centering component;

[0007] The bottom plate and the cover plate are arranged oppositely, and a paper feeding channel is formed between the inner sides of the bottom plate and the cover plate; a centering area is also arranged on the inner side of the bottom plate, and the paper can move from the outlet of the paper feeding channel to the centering area;

[0008] A plurality of paper feeding ports are penetrated through both the bottom plate and the cover plate, the paper feeding roller group is located at the paper feeding ports, and the paper feeding roller group is used to transport the paper from the inlet of the paper feeding channel to the outlet of the paper feeding channel;

[0009] The centering component includes two oppositely arranged centering clamping plates, the centering clamping plates are slidably installed on the centering area of the bottom plate, and the two centering clamping plates can synchronously approach each other to adjust the position of the paper.

[0010] Preferably, the centering component further includes a synchronous driving mechanism;

[0011] The synchronous driving mechanism includes a first driving motor, a first driving wheel, a first driven wheel and a synchronous belt;

[0012] The first driving motor and the first driving wheel are both arranged on the first side of the bottom plate, the first driven wheel is arranged on the second side of the bottom plate, the synchronous belt is wound around the first driving wheel and the first driven wheel, and both of the centering clamping plates are fixedly connected to the synchronous belt. The synchronous belt can drive the two centering clamping plates to move synchronously in opposite directions.

[0013] Preferably, the centering clamping plate includes a guide plate, a connecting plate and a sealing plate which are connected in sequence. The guide plate and the sealing plate are parallel, the guide plate is in mutual contact with the bottom plate, and the paper can move between the guide plate and the sealing plate.

[0014] Preferably, a tipping plate is arranged at the outlet of the paper feeding channel close to the centering area. The tipping plate forms a certain angle with the bottom plate, and the paper can move along the tipping plate onto the guide plate.

[0015] Preferably, the paper feeding assembly includes a paper feeding wheel group and a paper pressing wheel group which are arranged corresponding to each other;

[0016] The paper feeding wheel group includes an inlet paper feeding wheel and an outlet paper feeding wheel which are rotatably arranged on the outer side surface of the bottom plate. The inlet paper feeding wheel and the outlet paper feeding wheel are respectively located at the inlet and the outlet of the paper feeding channel, and the rims of the inlet paper feeding wheel and the outlet paper feeding wheel can enter the paper feeding channel through the paper feeding port;

[0017] The paper pressing wheel group includes an inlet paper pressing wheel and an outlet paper pressing wheel which are arranged on the outer side surface of the cover plate. The inlet paper pressing wheel and the outlet paper pressing wheel are respectively located at the inlet and the outlet of the paper feeding channel, and the rims of the inlet paper pressing wheel and the outlet paper pressing wheel can enter the paper feeding channel through the paper feeding port;

[0018] The rim of the inlet paper pressing wheel is in contact with the rim of the inlet paper feeding wheel, and the rim of the outlet paper pressing wheel can abut against the rim of the outlet paper feeding wheel.

[0019] Preferably, a first driving assembly is arranged on the cover plate, and the first driving assembly is connected to the outlet paper pressing wheel;

[0020] The first driving assembly can drive the outlet paper pressing wheel to move reciprocally so that the outlet paper pressing wheel abuts against or separates from the outlet paper feeding wheel.

[0021] Preferably, a centering paper feeding wheel and a centering paper pressing wheel are respectively rotatably arranged on the outer side surface and the inner side surface of the bottom plate. The centering paper pressing wheel and the centering paper feeding wheel are both located in the centering area of the bottom plate;

[0022] A paper feeding port is penetratingly provided on the centering area of the bottom plate, and the rims of the centering paper feeding wheel and the centering paper pressing wheel can abut against each other through the paper feeding port.

[0023] Preferably, the paper conveying device further includes an outer support frame, and both the bottom plate and the cover plate are fixedly installed on the outer support frame.

[0024] Preferably, a second driving assembly and the flipping bracket are further provided on the outer support frame; the flipping bracket is located at the centering area and on the inner side surface of the bottom plate;

[0025] The flipping bracket is rotatably installed on the outer support frame, and the second driving assembly can drive the flipping bracket to rotate around a first axis; a baffle and the centering paper pressing wheel are provided on the flipping bracket, the baffle is located on one side of the first axis, and the centering paper pressing wheel is located on the other side of the first axis;

[0026] When the flipping bracket rotates to the centering station, the baffle abuts against the inner side surface of the bottom plate, and the centering paper pressing wheel disengages from the centering paper feeding wheel; when the flipping bracket rotates to the paper feeding station, the baffle disengages from the inner side surface of the bottom plate, and the rim of the centering paper pressing wheel abuts against the centering paper feeding wheel.

[0027] Preferably, a plurality of positioning pins are further provided on the outer support frame.

[0028] (III) Beneficial Effects

[0029] In the present utility model, the two centering clamping plates move synchronously from the initial position and approach each other, thereby adjusting the position of the paper, so that when the paper enters the printer for double-sided printing, the relative position between the paper and the printer is determined and will not shift, effectively reducing the situation where the printed contents on the front and back sides of the paper are misaligned. Description of the Drawings

[0030] Figure 1 is a schematic diagram of the overall structure of the paper conveying device of the present utility model;

[0031] Figure 2 is an exploded view of the paper conveying device of the present utility model;

[0032] Figure 3 is a top view of the paper conveying device of the present utility model;

[0033] Figure 4 is Figure 3 a cross-sectional view taken at A-A;

[0034] Figure 5 is an exploded view of the centering assembly in the present utility model.

[0035] [Description of Reference Numerals]

[0036] 1: bottom plate; 10: paper feeding channel; 100: centering area; 11: paper feeding port; 12: seesaw; 13: centering paper feeding wheel; 14: centering paper pressing wheel; 2: cover plate; 21: first driving assembly; 3: paper feeding roller group; 31: paper feeding wheel group; 311: inlet paper feeding wheel; 312: outlet paper feeding wheel; 32: paper pressing wheel group; 321: inlet paper pressing wheel; 322: outlet paper pressing wheel; 4: centering assembly; 41: centering clamp; 411: guide plate; 412: connecting plate; 413: sealing plate; 42: synchronous driving mechanism; 421: first driving motor; 422: first driving wheel; 423: first driven wheel; 424: synchronous belt; 425: guide slider; 426: guide shaft; 5: outer support frame; 51: second driving assembly; 52: flip bracket; 521: baffle; 53: positioning pin. DETAILED DESCRIPTION

[0037] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The present utility model provides a paper conveying device, which includes: a bottom plate 1, a cover plate 2, a paper feeding roller group 3, and a centering assembly 4. The bottom plate 1 and the cover plate 2 are arranged opposite to each other, and a paper feeding channel 10 is formed between the inner side surface of the bottom plate 1 (the inner side surface of the bottom plate 1 refers to the side surface of the bottom plate 1 opposite to the cover plate 2) and the inner side surface of the cover plate 2 (the inner side surface of the cover plate 2 refers to the side surface of the cover plate 2 opposite to the bottom plate 1) (as Figure 4 shown); a centering area 100 is further provided on the inner side surface of the bottom plate 1, and the paper can move from the outlet of the paper feeding channel 10 to the centering area 100. The paper conveying device in the present utility model is used in a printer and functions to convey paper in the printer. A plurality of paper feeding ports 11 penetrate through both the bottom plate 1 and the cover plate 2, and the paper feeding roller group 3 is located at the paper feeding ports 11. The paper feeding roller group 3 is used to transport the paper from the inlet of the paper feeding channel 10 to the outlet of the paper feeding channel 10. In the present utility model, the paper first moves from the inlet of the paper feeding channel 10 to the outlet of the paper feeding channel 10, then moves from the outlet of the paper feeding channel 10 to the centering area 100, and then moves from the centering area 100 into the printer. The centering assembly 4 includes two relatively arranged centering clamping plates 41, and the centering clamping plates 41 are slidably installed on the centering area 100 of the bottom plate 1. The two centering clamping plates 41 can synchronously approach each other to adjust the position of the paper.

[0042] During the actual use process, when the centering clamping plates 41 are in the initial position, the distance between the two centering clamping plates 41 is slightly larger than the width of the paper. When the paper moves to the centering area 100, the two centering clamping plates 41 move synchronously from the initial position and approach each other, thereby adjusting the position of the paper, so that when the paper enters the printer for double-sided printing, the relative position between the paper and the printer is determined and will not shift, effectively reducing the situation where the printing contents on the front and back sides of the paper are misaligned. The midpoint between the two centering clamping plates 41 is located on the reference line (the reference line means that when the paper moves along the reference line into the printer for printing, the printing content will not shift, and the reference line can be the midline of the centering area 100), and to ensure that the two centering clamping plates 41 move synchronously. When the two centering clamping plates 41 approach each other so that the distance between them is the width of the paper, it can ensure that the midline of the paper coincides with the reference line and the paper will not shift.

[0043] Further, as Figure 5As shown in the figure, the centering assembly 4 further includes a synchronous drive mechanism 42. The synchronous drive mechanism 42 includes a first drive motor 421, a first driving pulley 422, a first driven pulley 423, and a synchronous belt 424. The first drive motor 421 and the first driving pulley 422 are both arranged on the first side of the bottom plate 1, the first driven pulley 423 is arranged on the second side of the bottom plate 1, the synchronous belt 424 is wound around the first driving pulley 422 and the first driven pulley, and both centering clamping plates 41 are fixedly connected to the synchronous belt 424. Specifically, the centering clamping plate 41 can be fixedly connected to the synchronous belt 424 through a guide slider 425. The guide slider 425 is slidably mounted on a guide shaft 426, and the synchronous belt 424 can drive the two centering clamping plates 41 to move synchronously in opposite directions.

[0044] In the above solution, the first drive motor 421 is connected to the first driving pulley 422. The first drive motor 421 can drive the first driving pulley 422 to rotate. The first driving pulley 422 drives the driven pulley to rotate through the synchronous belt 424. During the movement of the synchronous belt 424, the two centering clamping plates 41 can be driven to move together. Since the moving speed of each point on the synchronous belt 424 is the same, installing the two centering clamping plates 41 on different sides of the synchronous belt 424 can ensure that the moving directions of the two centering clamping plates 41 are opposite, and further achieve the synchronous movement of the two centering clamping plates 41 in opposite directions. In a specific embodiment, the first drive motor 421 can be a stepping motor, and the stepping motor is used to control the movement distance of the synchronous belt 424, ensuring that the two centering clamping plates 41 can move to the corresponding positions.

[0045] Furthermore, as Figure 5 shown, the centering clamping plate 41 includes a guide plate 411, a connecting plate 412, and a sealing plate 413 connected in sequence. The guide plate 411 and the sealing plate 413 are parallel, and the guide plate 411 is in contact with the bottom plate 1, and the paper can move between the guide plate 411 and the sealing plate 413. When the centering clamping plate 41 is set in a C shape, the edge of the paper can be located inside the centering clamping plate 41, which is convenient for the centering clamping plate 41 to drive the paper to move.

[0046] A tipping plate 12 is provided at the exit of the paper feeding channel 10 near the centering area 100. The tipping plate 12 forms a certain angle with the bottom plate 1, and the paper can move along the tipping plate 12 to the guide plate 411. The setting of the tipping plate 12 ensures that the paper can move into the centering clamping plate 41 more conveniently.

[0047] On the one hand, as Figure 2 and Figure 4As shown in the figure, the paper feeding assembly includes a paper feeding wheel group 31 and a paper pressing wheel group 32 which are arranged corresponding to each other. The paper feeding wheel group 31 includes an inlet paper feeding wheel 311 and an outlet paper feeding wheel 312 which are rotatably arranged on the outer side surface of the bottom plate 1. The inlet paper feeding wheel 311 and the outlet paper feeding wheel 312 are respectively located at the inlet and outlet of the paper feeding channel 10, and the rims of the inlet paper feeding wheel 311 and the outlet paper feeding wheel 312 can enter the paper feeding channel 10 through the paper feeding port 11. The paper pressing wheel group 32 includes an inlet paper pressing wheel 321 and an outlet paper pressing wheel 322 which are arranged on the outer side surface of the cover plate 2. The inlet paper pressing wheel 321 and the outlet paper pressing wheel 322 are respectively located at the inlet and outlet of the paper feeding channel 10, and the rims of the inlet paper pressing wheel 321 and the outlet paper pressing wheel 322 can enter the paper feeding channel 10 through the paper feeding port 11. The rim of the inlet paper pressing wheel 321 is attached to the rim of the inlet paper feeding wheel 311, and the rim of the outlet paper pressing wheel 322 can abut against the rim of the outlet paper feeding wheel 312. When the paper enters from the inlet of the paper feeding channel 10, the inlet paper pressing wheel 321 presses the paper on the inlet paper feeding wheel 311, and the inlet paper feeding wheel 311 rotates to drive the paper to move to the outlet of the paper feeding channel 10. At this time, the outlet paper pressing wheel 322 presses the paper on the outlet paper feeding wheel 312 again, and the outlet paper feeding wheel 312 rotates to drive the paper to move further.

[0048] In a specific embodiment, a first driving assembly 21 is arranged on the cover plate 2, and the first driving assembly 21 is connected to the outlet paper pressing wheel 322. The first driving assembly 21 can drive the outlet paper pressing wheel 322 to move reciprocally so that the outlet paper pressing wheel 322 abuts against or separates from the outlet paper feeding wheel 312. By controlling the first driving assembly 21, it can be adjusted whether the outlet paper pressing wheel 322 abuts against the outlet paper feeding wheel 312. When the outlet paper pressing wheel 322 abuts against the outlet paper feeding wheel 312, at this time the outlet paper pressing wheel 322 can press the paper on the outlet paper feeding wheel 312, so that the outlet paper feeding wheel 312 can drive the paper to move; when the outlet paper pressing wheel 322 is away from the outlet paper feeding wheel 312, at this time the paper is in a slack state, and the outlet paper feeding wheel 312 cannot drive the paper to move. Arranging the first driving assembly 21 can control whether the paper enters the centering area 100. When the centering clamp plate 41 in the centering area 100 corrects the position of the paper, at this time the first driving assembly 21 drives the outlet paper pressing wheel 322 away from the outlet paper feeding wheel 312, so that the paper stays in the paper feeding channel 10; when the paper in the centering area 100 completes the position correction and moves out of the centering area 100, the first driving assembly 21 drives the outlet paper pressing wheel 322 to abut against the outlet paper feeding wheel 312, so that the outlet paper feeding wheel 312 drives the paper to move into the centering area 100. The first driving assembly 21 can be a mechanism that can move reciprocally driven by an electromagnet (by the energization and de-energization of the electromagnet, and then changing the attraction of the electromagnet to drive the outlet paper pressing wheel 322 to move), or a lead screw nut mechanism.

[0049] Next, a centering paper feeding wheel 13 and a centering paper pressing wheel 14 are respectively rotatably arranged on the outer side surface and the inner side surface of the bottom plate 1. The centering paper pressing wheel 14 and the centering paper feeding wheel 13 are both located at the centering area 100 of the bottom plate 1. A paper feeding port 11 is penetratingly arranged on the centering area 100 of the bottom plate 1, and the rims of the centering paper feeding wheel 13 and the centering paper pressing wheel 14 can be abutted against each other through the paper feeding port 11.

[0050] The paper conveying device further includes an outer support frame 5, and the bottom plate 1 and the cover plate 2 are both fixedly installed on the outer support frame 5. A second driving assembly 51 and a flipping bracket 52 are further arranged on the outer support frame 5; the flipping bracket 52 is located at the centering area 100 and on the inner side surface of the bottom plate 1. The flipping bracket 52 is rotatably installed on the outer support frame 5, and the second driving assembly 51 can drive the flipping bracket 52 to rotate around the first axis; a baffle 521 and the centering paper pressing wheel 14 are arranged on the flipping bracket 52. The baffle 521 is located on one side of the first axis, and the centering paper pressing wheel 14 is located on the other side of the first axis. When the flipping bracket 52 rotates to the centering station, the baffle 521 abuts against the inner side surface of the bottom plate 1, and the centering paper pressing wheel 14 disengages from the centering paper feeding wheel 13; when the flipping bracket 52 rotates to the paper feeding station, the baffle 521 disengages from the inner side surface of the bottom plate 1, and the rim of the centering paper pressing wheel 14 abuts against the centering paper feeding wheel 13.

[0051] In this solution, the second driving assembly 51 and the first driving assembly 21 are the same. When the flipping bracket 52 is directly in the centering station, at this time, the two centering clamping plates 41 calibrate the position of the paper. Since the centering paper pressing wheel 14 is not abutted against the centering paper feeding wheel 13, at this time, the centering paper feeding wheel 13 cannot drive the paper to move, and the baffle 521 can also block the movement of the paper, which ensures that the centering operation of the paper can be carried out normally; when the flipping bracket 52 is in the paper feeding station, the centering paper pressing wheel 14 can press the paper on the centering paper wheel, and the paper can move under the drive of the centering paper feeding wheel 13. Since the baffle 521 is far away from the bottom plate 1 at this time, the paper can smoothly move from the centering area 100 on the bottom plate 1 into the printer.

[0052] Finally, a plurality of positioning pins 53 are further arranged on the outer support frame 5. The positioning pins 53 can be used to quickly complete the positioning of the paper conveying device in the printer, and then complete the installation.

[0053] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. A paper conveying device, characterized in that: The paper conveying device comprises: a bottom plate (1), a cover plate (2), a paper conveying roller group (3) and a centering component (4); The bottom plate (1) and the cover plate (2) are arranged opposite to each other, and a paper feeding channel (10) is formed between the inner side surface of the bottom plate (1) and the inner side surface of the cover plate (2); a centering area (100) is also arranged on the inner side surface of the bottom plate (1), and the paper can move from the outlet of the paper feeding channel (10) to the centering area (100); The bottom plate (1) and the cover plate (2) are both provided with a plurality of paper feeding ports (11), the paper feeding roller group (3) is located at the paper feeding port (11), and the paper feeding roller group (3) is used to transport paper from the inlet of the paper feeding channel (10) to the outlet of the paper feeding channel (10); The centering assembly (4) comprises two centering clamps (41) arranged opposite to each other. The centering clamps (41) are slidably mounted on the centering area (100) of the base plate (1). The two centering clamps (41) can be synchronously moved closer to each other to adjust the position of the paper.

2. The paper conveying device according to claim 1, characterized in that: The centering assembly (4) further comprises a synchronous drive mechanism (42); The synchronous drive mechanism (42) comprises a first drive motor (421), a first driving wheel (422), a first driven wheel (423) and a synchronous belt (424); The first driving motor (421) and the first driving wheel (422) are both arranged on the first side of the base plate (1), the first driven wheel (423) is arranged on the second side of the base plate (1), the synchronous belt (424) is wound around the first driving wheel (422) and the first driven wheel (423), the two centering plates (41) are fixedly connected to the synchronous belt (424), and the synchronous belt (424) can drive the two centering plates (41) to move synchronously in opposite directions.

3. The paper conveying device according to claim 2, characterized in that: The centering clamp (41) comprises a guide plate (411), a connecting plate (412) and a sealing plate (413) which are connected in sequence; the guide plate (411) and the sealing plate (413) are parallel; the guide plate (411) and the bottom plate (1) are in contact with each other; and the paper can move between the guide plate (411) and the sealing plate (413).

4. The paper conveying device according to claim 3, characterized in that: A seesaw (12) is provided on the centering area (100) on the bottom plate (1) near the exit of the paper feeding channel (10); the seesaw (12) forms a certain angle with the bottom plate (1), and the paper can move along the seesaw (12) to the guide plate (411).

5. The paper conveying device according to any one of claims 1 to 4, characterized in that: The paper feeding roller group (3) comprises a paper feeding wheel group (31) and a paper pressing wheel group (32) which are arranged corresponding to each other; The paper feeding wheel group (31) comprises an inlet paper feeding wheel (311) and an outlet paper feeding wheel (312) which are rotatably arranged on the outer side surface of the bottom plate (1); the inlet paper feeding wheel (311) and the outlet paper feeding wheel (312) are respectively located at the inlet and the outlet of the paper feeding channel (10); and the wheel rims of the inlet paper feeding wheel (311) and the wheel rims of the outlet paper feeding wheel (312) can both enter the paper feeding channel (10) through the paper feeding port (11); The paper pressing wheel group (32) comprises an inlet paper pressing wheel (321) and an outlet paper pressing wheel (322) arranged on the outer side surface of the cover plate (2); the inlet paper pressing wheel (321) and the outlet paper pressing wheel (322) are respectively located at the inlet and the outlet of the paper feeding channel (10); and the wheel edges of the inlet paper pressing wheel (321) and the outlet paper pressing wheel (322) can enter the paper feeding channel (10) through the paper feeding port (11); The wheel rim of the inlet paper pressing wheel (321) fits with the wheel rim of the inlet paper feeding wheel (311), and the wheel rim of the outlet paper pressing wheel (322) can abut against the wheel rim of the outlet paper feeding wheel (312).

6. The paper conveying device according to claim 5, characterized in that: The cover plate (2) is provided with a first driving assembly (21), and the first driving assembly (21) is connected to the exit paper pressing wheel (322); The first driving assembly (21) can drive the outlet paper pressing wheel (322) to move back and forth, so that the outlet paper pressing wheel (322) abuts against or separates from the outlet paper feeding wheel (312).

7. The paper conveying device according to any one of claims 1 to 4, characterized in that: A centering paper feeding wheel (13) and a centering paper pressing wheel (14) are rotatably arranged on the outer side surface and the inner side surface of the bottom plate (1), respectively, and the centering paper pressing wheel (14) and the centering paper feeding wheel (13) are both located in the centering area (100) of the bottom plate (1); The paper feeding port (11) is provided through the centering area (100) of the bottom plate (1), and the wheel edges of the centering paper feeding wheel (13) and the centering paper pressing wheel (14) can abut against each other through the paper feeding port (11).

8. The paper conveying device according to claim 7, characterized in that: The paper conveying device also includes an outer support frame (5), and the bottom plate (1) and the cover plate (2) are both fixedly mounted on the outer support frame (5).

9. The paper conveying device according to claim 8, characterized in that: The outer support frame (5) is also provided with a second driving assembly (51) and a flip bracket (52); the flip bracket (52) is located at the centering area (100) and on the inner side surface of the bottom plate (1); The flip bracket (52) is rotatably mounted on the outer support frame (5), and the second driving assembly (51) is capable of driving the flip bracket (52) to rotate around a first axis; a baffle (521) and the centering paper pressing wheel (14) are provided on the flip bracket (52), the baffle (521) is located on one side of the first axis, and the centering paper pressing wheel (14) is located on the other side of the first axis; When the flip bracket (52) rotates to the centering position, the baffle (521) abuts against the inner side surface of the base plate (1), and the centering paper pressing wheel (14) is separated from the centering paper feeding wheel (13); when the flip bracket (52) rotates to the paper feeding position, the baffle (521) is separated from the inner side surface of the base plate (1), and the rim of the centering paper pressing wheel (14) abuts against the centering paper feeding wheel (13).

10. The paper conveying device according to claim 9, characterized in that: The outer support frame (5) is also provided with a plurality of positioning pins (53).

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