A printing and scanning machine with a common clutch structure

Abstract

The application discloses a printing and scanning machine with a shared clutch structure, which comprises a machine shell, a printing device arranged in the machine shell, a scanning device arranged in the machine shell, and a paper feeding driving device arranged in the machine shell. The printing device comprises a printing paper taking shaft, a printing paper rubbing wheel and a carriage. The scanning device comprises a scanning paper feeding shaft, a scanning paper feeding wheel, a scanning paper discharging shaft, a scanning paper discharging wheel, a scanning pressing wheel, a scanning transmission chain assembly and a scanning sensor. The paper feeding driving device comprises a paper feeding shaft, a clutch structure and a driving motor. The driving motor is used for driving the paper feeding shaft to rotate. The paper feeding shaft is in transmission connection with the clutch structure, so as to drive the clutch structure to be in transmission connection with the printing paper taking shaft or the scanning paper feeding shaft, and drive the printing paper taking shaft or the scanning paper feeding shaft to rotate. In the application, the production cost can be reduced, the volume of the printing and scanning machine is smaller, and the printing and scanning machine is more convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing and scanning, in particular to a printing and scanning machine with shared clutch structure. BACKGROUND

[0002] Traditional printers generally only have printing function, and the function is relatively single. Enterprises need to additionally set up a scanning machine when scanning work is needed, which occupies more office space. In view of this, printing and scanning all-in-one machines are put on the market, which contain printing function and scanning function to meet the office needs of enterprises.

[0003] However, the printing and scanning machines of the prior art generally use separate driving mechanisms to drive the printing and scanning work, which occupies too much space, resulting in a large size and high cost of the printing and scanning machine. SUMMARY

[0004] Therefore, the present application aims to provide a printing and scanning machine with shared clutch structure to realize miniaturization of the printing and scanning machine.

[0005] A printing and scanning machine with shared clutch structure comprises:

[0006] a machine shell;

[0007] a printing device arranged in the machine shell, the printing device comprising a printing paper take-up shaft, a printing paper rubbing wheel and a carriage, the printing paper rubbing wheel being arranged on the outer periphery of the printing paper take-up shaft to rub the paper into the machine shell and move to the carriage for printing work;

[0008] a scanning device arranged in the machine shell, the scanning device comprising a scanning paper take-up shaft, a scanning paper rubbing wheel, a scanning paper take-up shaft, a scanning paper rubbing wheel, a scanning pressure wheel, a scanning transmission chain assembly and a scanning sensor, the scanning paper rubbing wheel being arranged on the outer periphery of the scanning paper take-up shaft, the scanning paper rubbing wheel being arranged on the outer periphery of the scanning paper take-up shaft, the scanning paper take-up shaft and the scanning paper rubbing wheel being used to transmit the paper to the scanning sensor for scanning work, the scanning paper take-up shaft and the scanning paper rubbing wheel being used to send the paper out of the printing and scanning machine, the lower parts of the scanning paper rubbing wheel and the scanning paper rubbing wheel being provided with the scanning pressure wheel, the two scanning pressure wheels being in tight contact with the scanning paper rubbing wheel and the scanning paper take-up shaft through elastic members to ensure smooth paper feeding and paper discharging, and the scanning paper take-up shaft being in transmission connection with the scanning paper take-up shaft through the scanning transmission chain assembly;

[0009] a paper feeding driving device arranged in the machine shell, the paper feeding driving device comprising a paper feeding shaft, a clutch structure and a driving motor, the driving motor being used to drive the paper feeding shaft to rotate, the paper feeding shaft being in transmission connection with the clutch structure to drive the clutch structure to be in transmission connection with the printing paper take-up shaft or the scanning paper take-up shaft to drive the printing paper take-up shaft or the scanning paper take-up shaft to rotate.

[0010] In the present application, the clutching mechanism is driven by the paper feeding driving device to be in transmission connection with the printing take-up shaft or the scanning feed-in shaft, so as to drive the printing take-up shaft or the scanning feed-in shaft to rotate correspondingly. Thus, one paper feeding driving device can be used to drive the printing and scanning machine to perform printing or scanning work. The transmission components can be reduced, the production cost can be lowered, the space occupied by the transmission components in the printing and scanning machine can be reduced, the printing and scanning machine can be made smaller, and the printing and scanning machine is more convenient to use.

[0011] Preferably, the printing take-up shaft is located at the front side of the machine shell, and the scanning feed-in shaft is located at the rear side of the machine shell.

[0012] Preferably, a paper feeding gear is fixed to the outer periphery of the paper feeding shaft, a take-up gear is fixed to the end of the printing take-up shaft, and a scanning feed-in shaft gear and a scanning feed-out shaft gear are correspondingly fixed to the ends of the scanning feed-in shaft and the scanning feed-out shaft. The scanning feed-in shaft gear and the scanning feed-out shaft gear are in transmission connection through a scanning transmission chain assembly, and the scanning feed-in shaft gear and the scanning feed-out shaft gear rotate in the same direction.

[0013] The clutching mechanism comprises a connecting shaft, a first connecting gear, a second connecting gear and connecting plates. The connecting shaft is rotationally connected in the machine shell. The first connecting gear is fixed to the connecting shaft. The connecting plates are oppositely connected to the connecting shaft, and the connecting plates are dampingly connected to the connecting shaft, so that the connecting shaft can rotate relative to the connecting plates when the connecting plates are blocked. The first connecting gear is arranged between one end of the two connecting plates. The second connecting gear is rotationally connected between the other end of the two connecting plates. The first connecting gear and the second connecting gear are in meshing.

[0014] The paper feeding gear is in meshing with the first connecting gear, and the second connecting gear is in meshing with the take-up gear or the scanning feed-out shaft gear.

[0015] Preferably, a pressing wheel and a pressing spring are further arranged in the machine shell. The pressing spring pushes the pressing wheel to press against the lower part of the paper feeding shaft, so that the paper feeding shaft rotates in the forward direction and feeds the paper to the platen after the paper feeding shaft rotates in the reverse direction and drives the printing rubbing wheel on the printing take-up shaft to feed the paper to the paper feeding shaft.

[0016] The limiting mechanism is further arranged to limit the rotation of the clutching mechanism to the scanning feed-out shaft gear when the paper feeding shaft rotates in the forward direction.

[0017] Preferably, the limiting mechanism comprises a pushing plate, a limiting plate, a reset elastic member and a limiting block arranged on the side of the connecting plate, the pushing plate is connected to the cabinet, one end of the pushing plate extends to the initial position of the carriage, the other end of the pushing plate is connected with the limiting plate, the reset elastic member is connected between the pushing plate and the cabinet, when the carriage is performing a printing operation, the limiting plate is abutted on the limiting block under the pushing force of the reset elastic member to limit the downward rotation of the clutch structure; after the carriage returns to the initial position after completing the printing operation, the carriage pushes the pushing plate to separate the limiting plate from the limiting block to release the limitation on the clutch structure.

[0018] Preferably, the side surface of the one end of the pushing plate extending to the initial position of the carriage is provided with an inclined guide surface for facilitating the pushing of the carriage.

[0019] Preferably, the first intermediate gear is rotatably connected in the cabinet and meshes between the paper feeding gear and the first connecting gear.

[0020] Preferably, the diameter of the first intermediate gear is smaller than the diameter of the paper feeding gear.

[0021] Preferably, the first paper taking transmission gear and the second paper taking transmission gear are coaxially fixed between the second connecting gear and the paper taking gear, the first paper taking transmission gear and the second paper taking transmission gear are rotatably connected in the cabinet, the first paper taking transmission gear meshes with the second connecting gear, and the second paper taking transmission gear meshes with the paper taking gear.

[0022] The diameters of the first intermediate gear, the first connecting gear and the second connecting gear are the same, the diameter of the first paper taking transmission gear is larger than the diameter of the second connecting gear, and the diameter of the paper taking gear is larger than the diameter of the second paper taking transmission gear.

[0023] Preferably, the first scanning transmission double gear, the second scanning transmission double gear and a second intermediate gear are rotatably connected in the cabinet between the second connecting gear and the scanning paper ejection shaft gear, the first scanning transmission double gear meshes with the scanning paper ejection shaft gear through the second scanning transmission double gear and the second intermediate gear, when the clutch structure rotates downward, the second connecting gear meshes with the first scanning transmission double gear to drive the scanning paper ejection shaft gear to rotate, and the transmission ratio of the scanning paper feeding shaft gear to the scanning paper ejection shaft gear is 1:1.

[0024] Compared with the prior art, the printing and scanning machine with the shared clutch structure has less transmission components, and only one driving motor is needed to drive the printing and scanning work, so that the manufacturing cost is lower, the assembly difficulty is lower, and miniaturization design can be realized, thereby facilitating the use of users.

[0025] In order to better understand and implement, the present application is described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic view of the relationship between the printing device, the scanning device and the paper feeding driving device in the present application;

[0027] Figure 2 A schematic view of the front end of the structure of the present application;

[0028] Figure 3 A schematic view of the rear end of the structure of the present application;

[0029] Figure 4 A schematic view of the bottom of the structure of the present application;

[0030] Figure 5 A schematic view of the relationship between the clutch structure, the first paper taking transmission gear and the first scanning transmission double gear of the present application;

[0031] Figure 6 Another view of the schematic view of the relationship between the clutch structure, the first paper taking transmission gear and the first scanning transmission double gear of the present application;

[0032] Figure 7 A Figure 6 Enlarged view of A in FIG. 6.

[0033] The drawings show that: 1, the shell; 2, the printing device; 21, the printing paper taking shaft; 22, the printing paper rubbing wheel; 23, the character carriage; 24, the paper taking gear; 25, the first paper taking transmission gear; 26, the second paper taking transmission gear; 3, the scanning device; 31, the scanning paper feeding shaft; 32, the scanning paper feeding wheel; 33, the first scanning transmission double gear; 34, the second scanning transmission double gear; 35, the scanning paper feeding shaft gear; 36, the scanning paper discharging shaft; 37, the scanning paper discharging wheel; 38, the scanning pressing wheel; 39, the scanning paper discharging shaft gear; 4, the paper feeding driving device; 41, the paper feeding shaft; 42, the clutch structure; 421, the connecting shaft; 422, the first connecting gear; 423, the second connecting gear; 424, the connecting plate; 43, the driving motor; 44, the paper feeding gear; 45, the first intermediate gear; 5, the limiting mechanism; 51, the pushing plate; 52, the limiting plate; 53, the reset elastic member; 54, the limiting block; 6, the second intermediate gear; 7, the scanning transmission chain assembly; 8, the scanning sensor. DETAILED DESCRIPTION

[0034] The orientation terms mentioned or possibly mentioned in the present specification, such as up, down, left, right, front, back, front side, back side, top, bottom, etc., are defined relative to the configuration thereof, and are relative concepts. Therefore, it is possible to change accordingly according to different positions, different use states, etc. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0035] The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of implementations consistent with some aspects of the present disclosure.

[0036] The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used in the present disclosure, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] As shown in Figures 1 to 7 The present application relates to a printing scanner with a common clutch structure 42, comprising:

[0038] a casing 1;

[0039] a printing device 2, which is arranged in the casing 1, and comprises a printing paper taking shaft 21, a printing paper rubbing wheel 22 arranged on the outer periphery of the printing paper taking shaft 21 to rub the paper into the casing 1 and transmit the paper to the carriage 23 for printing work, and the carriage 23;

[0040] a scanning device 3, which is arranged in the casing 1, and comprises a scanning paper taking shaft 31, a scanning paper rubbing wheel 32 arranged on the outer periphery of the scanning paper taking shaft 31, a scanning paper taking-out shaft 36, a scanning paper taking-out wheel 37 arranged on the outer periphery of the scanning paper taking-out shaft 36, a scanning pressure wheel 38, a scanning transmission chain assembly 7, and a scanning sensor 8, the scanning paper taking shaft 31 and the scanning paper rubbing wheel 32 are used to transmit the paper to the scanning sensor 8 for scanning work, and the scanning paper taking-out shaft 36 and the scanning paper taking-out wheel 37 send the paper out of the printing scanner, the lower parts of the scanning paper rubbing wheel 32 and the scanning paper taking-out wheel 37 are both provided with the scanning pressure wheel 38, both the scanning pressure wheels 38 are in elastic contact with the scanning paper taking-out wheel 37 and the scanning paper rubbing wheel 32 through elastic members to ensure the smooth feeding and discharging of the paper, and the scanning paper taking shaft 31 is in transmission connection with the scanning paper taking-out shaft 36 through the scanning transmission chain assembly 7;

[0041] A paper feeding driving device 4 is arranged in the casing 1, which comprises a paper feeding shaft 41, a clutch structure 42 and a driving motor 43 for driving the paper feeding shaft 41 to rotate, the paper feeding shaft 41 is in transmission connection with the clutch structure 42, and the clutch structure 42 is in transmission connection with the printing paper taking shaft 21 or the scanning paper feeding shaft 31, so as to drive the printing paper taking shaft 21 or the scanning paper feeding shaft 31 to rotate.

[0042] In the present application, the clutch structure is in transmission connection with the printing paper taking shaft 21 or the scanning paper feeding shaft 31 by the paper feeding driving device 4, so as to drive the printing paper taking shaft 21 or the scanning paper feeding shaft 31 to rotate correspondingly, which realizes that one paper feeding driving device 4 can drive the printing and scanning machine to perform printing work or scanning work, can reduce the arrangement of transmission components, reduce the production cost, reduce the space occupied by the transmission components in the printing and scanning machine, and make the printing and scanning machine smaller in size and more convenient to use.

[0043] In the present embodiment, the printing paper taking shaft 21 is located at the front side of the casing 1, and the scanning paper feeding shaft 31 is located at the rear side of the casing 1, so as to perform printing work and scanning work on the paper fed at the front side and the rear side of the casing 1.

[0044] In the present embodiment, the paper feeding gear 44 is fixed on the outer periphery of the paper feeding shaft 41, the paper taking gear 24 is fixed on the end of the printing paper taking shaft 21, the scanning paper feeding shaft gear 35 is fixed on the end of the scanning paper feeding shaft 31, the scanning paper taking shaft gear 39 is fixed on the end of the scanning paper taking shaft 36, the scanning paper feeding shaft gear 35 and the scanning paper taking shaft gear 39 are in transmission connection through the scanning transmission chain assembly 7, and the rotating directions of the scanning paper feeding shaft gear 35 and the scanning paper taking shaft gear 39 are the same, the printing paper taking shaft 21 is located above the paper feeding shaft 41, and the scanning paper feeding shaft 31, the scanning paper taking shaft 36 and the scanning transmission chain assembly 7 are located below the paper feeding shaft 41.

[0045] The clutch structure 42 comprises a connecting shaft 421, a first connecting gear 422, a second connecting gear 423 and a connecting plate 424, the connecting shaft 421 is rotationally connected in the casing 1, the first connecting gear 422 is fixed on the connecting shaft 421, the connecting shaft 421 is connected with two connecting plates 424 which are opposite to each other, and the connecting plate 424 is dampingly connected with the connecting shaft 421, so that when the connecting plate 424 is blocked, the connecting shaft 421 can rotate relative to the connecting plate 424, the first connecting gear 422 is arranged between one end of the two connecting plates 424, and the second connecting gear 423 is rotationally connected between the other end of the two connecting plates 424, and the first connecting gear 422 and the second connecting gear 423 are in meshing.

[0046] The paper feeding gear 44 is engaged with the first connecting gear 422, and the second connecting gear 423 can be engaged with the paper taking gear 24 or the scanning paper out shaft gear 39, that is, the paper feeding gear 44 can drive the connecting plate 424 to rotate up and down around the connecting shaft 421, to drive the second connecting gear 423 to engage with the paper taking gear 24 or the scanning paper out shaft gear 39, and drive the paper taking gear 24 or the scanning paper in shaft gear 35 and the scanning paper out shaft gear 39 to rotate.

[0047] In the embodiment, the printing and scanning machine with the common clutch structure further comprises a first intermediate gear 45, which is rotationally connected in the casing 1, and the first intermediate gear 45 is engaged between the paper feeding gear 44 and the first connecting gear 422, so that when the paper feeding shaft 41 rotates forward, the clutch structure 42 can be driven to rotate downward and be in driving connection with the scanning paper out shaft gear 39, and when the paper feeding shaft 41 rotates reversely, the clutch structure 42 can be driven to rotate upward and be in driving connection with the paper taking gear 24.

[0048] In the embodiment, the casing 1 further comprises a pressing wheel and a pressing spring, the pressing spring pushes the pressing wheel to press against the lower part of the paper feeding shaft 41, so that after the paper feeding shaft 41 rotates reversely and drives the printing and paper rubbing wheel 22 on the printing paper taking shaft 21 to feed the paper to the paper feeding shaft 41, the paper feeding shaft 41 rotates forward and feeds the paper to the carriage 23.

[0049] The limiting mechanism 5 is further provided, which is used to limit the rotation of the clutch structure 42 to the scanning paper out shaft gear 39 when the paper feeding shaft 41 rotates forward.

[0050] Specifically, the limiting mechanism 5 comprises a pushing plate 51, a limiting plate 52, a reset elastic member 53 and a limiting block 54 arranged on the side surface of the connecting plate 424, the pushing plate 51 is connected in the casing 1, one end of the pushing plate 51 extends to the initial position of the carriage 23, and the other end of the pushing plate 51 is connected with the limiting plate 52, the reset elastic member 53 is connected between the pushing plate 51 and the casing 1, so that when the carriage 23 performs the printing operation, the limiting plate 52 is abutted against the limiting block 54 under the pushing force of the reset elastic member 53, to limit the downward rotation of the clutch structure 42, and after the carriage 23 completes the printing operation and returns to the initial position, the carriage 23 pushes the pushing plate 51, so that the limiting plate 52 is separated from the limiting block 54, to release the limitation on the clutch structure 42.

[0051] Through the limiting mechanism 5, when the paper feeding shaft 41 rotates forward and the carriage 23 performs the printing operation, the reset elastic member 53 pushes the limiting plate 52 to abut against the limiting block 54, to limit the downward rotation of the clutch structure 42, and the clutch structure 42 is in a horizontal state and is not in driving connection with the paper taking gear 24 and the scanning paper out shaft gear 39.

[0052] Preferably, the pushing plate 51 is provided with an inclined guiding surface on the side of the initial position of the carriage 23, which facilitates the pushing of the pushing plate 51 by the carriage 23, and drives the limiting plate 52 and the limiting block 54 to disengage, thereby releasing the restriction on the rotation of the clutch structure 42.

[0053] In the embodiment, the first intermediate gear 45 has a smaller diameter than the paper feeding gear 44, so that the paper feeding gear 44 can drive the clutch structure 42 to be connected with the paper taking gear 24 or the scanning paper taking shaft gear 39 more quickly, thereby improving the work efficiency.

[0054] Preferably, the printing and scanning machine with the shared clutch structure further comprises a first paper taking driving gear 25 and a second paper taking driving gear 26 arranged between the second connecting gear 423 and the paper taking gear 24, the first paper taking driving gear 25 and the second paper taking driving gear 26 are coaxially fixed double gears, and the first paper taking driving gear 25 and the second paper taking driving gear 26 are rotatably connected in the casing 1, the first paper taking driving gear 25 is engaged with the second connecting gear 423, and the second paper taking driving gear 26 is engaged with the paper taking gear 24.

[0055] The first intermediate gear 45, the first connecting gear 422 and the second connecting gear 423 have the same diameter, the first paper taking driving gear 25 has a larger diameter than the second connecting gear 423, and the paper taking gear 24 has a larger diameter than the second paper taking driving gear 26, thereby increasing the torque of the printing paper taking shaft 21, increasing the paper taking force of the printing paper taking wheel 22, and ensuring that the paper is taken into the casing 1.

[0056] In the embodiment, the printing and scanning machine with the shared clutch structure further comprises a first scanning driving double gear 33, a second scanning driving double gear 34 and a second intermediate gear 6 arranged between the second connecting gear 423 and the scanning paper taking shaft gear 39, the first scanning driving double gear 33, the second scanning driving double gear 34 and the second intermediate gear 6 are rotatably connected in the casing 1, the first scanning driving double gear 33 is engaged with the scanning paper taking shaft gear 39 through the second scanning driving double gear 34 and the second intermediate gear 6, when the clutch structure 42 rotates downward, the second connecting gear 423 is engaged with the first scanning driving double gear 33, thereby driving the scanning paper taking shaft gear 39 to rotate, and the scanning driving chain assembly 7 comprises five intermediate driving gears rotatably connected in the casing, the five intermediate driving gears are sequentially connected, and the two intermediate driving gears at the head and tail are engaged with the scanning paper taking shaft gear 39 and the scanning paper taking in shaft gear 35, respectively, and the scanning paper taking in shaft gear 35 and the scanning paper taking shaft gear 39 have a transmission ratio of 1:1.

[0057] The torque of the first scanning transmission double gear 33 and the second scanning transmission double gear 34 can be increased through the reduction effect of the second gear of the first scanning transmission double gear 33 and the second scanning transmission double gear 34, so as to increase the torsion of the scanning paper feeding wheel 32 and the scanning paper discharging wheel 37, and ensure that the paper is smoothly sent into the casing 1 to complete the scanning.

[0058] The specific working process of the printing scanner with the shared clutch structure of the present application is as follows:

[0059] When printing, the driving motor 43 drives the paper feeding shaft 41 to reverse, then drives the clutch structure 42 to rotate upwards around the connecting shaft 421, and makes the second connecting gear 423 of the clutch structure 42 engage with the first paper taking transmission gear 25, then drives the paper taking gear 24 to rotate through the second paper taking transmission gear 26, so as to rotate the printing paper taking shaft 21 and the printing paper rubbing wheel 22, and then the paper can be rubbed into the casing 1 and located between the paper feeding shaft 41 and the abutting wheel, then the driving motor 43 drives the paper feeding shaft 41 to rotate forward, so that the paper can be transmitted to the lower part of the carriage 23 for printing, at the same time, since the carriage 23 is printing, the carriage 23 is away from the initial position, so that the limiting plate 52 of the limiting mechanism 5 is blocked in front of the limiting block 54, to limit the downward rotation of the clutch structure 42, at this time, the clutch structure 42 is in a horizontal state, and is not in transmission connection with the printing device 2 and the scanning device 3, finally, when the printing of the carriage 23 is completed, the carriage 23 returns to the initial position to push the limiting plate 52 away from the limiting block 54, and the limitation of the clutch structure 42 is removed.

[0060] When scanning, the driving motor 43 drives the paper feeding shaft 41 to rotate forward, then drives the clutch structure 42 to rotate downwards around the connecting shaft 421, and makes the second connecting gear 423 of the clutch structure 42 engage with the first scanning transmission double gear 33, then drives the scanning paper discharging shaft gear 39 to rotate through the second scanning transmission double gear 34 and a second intermediate gear 6, and drives the scanning paper feeding shaft gear 35 to rotate through the scanning paper discharging shaft gear 39 through five intermediate transmission gears, so as to rotate the scanning paper feeding shaft 31, the scanning paper feeding wheel 32, the scanning paper discharging shaft 36 and the scanning paper discharging wheel 37, and then the paper can be sent into the lower part of the scanning sensor 8 for scanning, in addition, since the carriage 23 does not need to print, the carriage 23 is always in the initial state, and the limiting mechanism 5 does not limit the clutch structure 42 during the scanning.

[0061] In summary, compared with the prior art, the printing scanner with the shared clutch structure 42 has fewer transmission parts, only one driving motor 43 can drive the printing and scanning, the manufacturing cost is lower, the assembly difficulty is lower, and the design can be miniaturized, which is convenient for users to use.

[0062] The above embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the scope of the patent. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application.

Claims

1. A printer-scanner with a shared clutch structure, characterized in that: Include: The shell; The printing device is arranged in the shell, the printing device includes a printing paper shaft, a printing paper roller and a carriage, the printing paper roller is arranged on the outer periphery of the printing paper shaft, the paper is twisted into the shell, and the paper is moved to the carriage for printing work; The scanning device is arranged in the shell, the scanning device includes a scanning paper shaft, a scanning paper roller, a scanning paper shaft, a scanning paper roller, a scanning pressure roller, a scanning transmission chain assembly and a scanning sensor, the scanning paper roller is arranged on the outer periphery of the scanning paper shaft, the scanning paper roller is arranged on the outer periphery of the scanning paper shaft, the scanning paper shaft and the scanning paper roller are used to transmit the paper to the scanning sensor for scanning work, the scanning paper shaft and the scanning paper roller send the paper out of the printing and scanning machine, the lower part of the scanning paper roller and the scanning paper roller is provided with the scanning pressure roller, the two scanning pressure rollers are correspondingly abutted on the scanning paper roller and the scanning paper roller through the elastic element, to ensure that the paper is smoothly fed and discharged, the scanning paper shaft is drivenly connected with the scanning paper shaft through the scanning transmission chain assembly, the scanning transmission chain assembly includes five intermediate transmission gears rotatably connected in the shell, the five intermediate transmission gears are sequentially connected in transmission; The paper feeding drive device is arranged in the shell, the paper feeding drive device includes a paper feeding shaft, a clutch structure and a drive motor, the drive motor is used to drive the paper feeding shaft to rotate, the paper feeding shaft is in transmission with the clutch structure, to drive the clutch structure to be in transmission with the printing paper shaft or the scanning paper shaft, to drive the printing paper shaft or the scanning paper shaft to rotate; The shell is also provided with an abutting roller and an abutting spring, the abutting spring pushes the abutting roller to abut the lower part of the paper feeding shaft, so that after the paper feeding shaft reverses and drives the printing paper roller on the printing paper shaft to send the paper to the paper feeding shaft, the paper feeding shaft rotates forward and sends the paper to the carriage; It also includes a limiting mechanism, which is used to limit the rotation of the clutch structure to the scanning paper shaft gear when the paper feeding shaft rotates forward; The limiting mechanism includes a pushing plate, a limiting plate, a reset elastic element and a limiting block arranged on the side of the connecting plate, the pushing plate is connected in the shell, one end of which extends to the initial position of the carriage, the other end of which is connected with the limiting plate, the reset elastic element is connected between the pushing plate and the shell, so that when the carriage performs printing work, the limiting plate abuts on the limiting block under the pushing force of the reset elastic element, to limit the downward rotation of the clutch structure; after the carriage completes the printing work and returns to the initial position, the carriage pushes the pushing plate, so that the limiting plate and the limiting block are separated, to release the limitation of the clutch structure.

2. The print scanner of claim 1, wherein: The printing paper shaft is located on the front side of the shell, and the scanning paper shaft is located on the rear side of the shell.

3. The print scanner of claim 2 wherein, The outer periphery of the paper feeding shaft is fixed with a paper feeding gear, the end of the printing paper shaft is fixed with a paper taking gear, the end of the scanning paper shaft and the scanning paper shaft is correspondingly fixed with a scanning paper shaft gear and a scanning paper shaft gear, the scanning paper shaft gear and the scanning paper shaft gear are in transmission through the scanning transmission chain assembly, and the scanning paper shaft gear and the scanning paper shaft gear rotate in the same direction; The clutch structure comprises a connecting shaft, a first connecting gear, a second connecting gear and connecting plates, the connecting shaft is rotationally connected in the casing, the first connecting gear is fixed on the connecting shaft, the connecting shaft is dampedly connected with the connecting plates which are opposite to each other, the connecting plates can rotate relative to the connecting shaft when the connecting plates are blocked, the first connecting gear is arranged between one ends of the connecting plates, and the second connecting gear is rotationally connected between the other ends of the connecting plates, and the first connecting gear and the second connecting gear are engaged. The paper feeding gear is engaged with the first connecting gear, and the second connecting gear is engaged with the paper taking gear or the scanning paper taking shaft gear.

4. The print scanner of claim 1, wherein: The inclined guide surface is arranged on the side surface of the pushing plate which extends to one end of the initial position of the carriage.

5. The print scanner of claim 3 wherein: The first intermediate gear is rotationally connected in the casing and engaged between the paper feeding gear and the first connecting gear.

6. The print scanner of claim 5 wherein, The diameter of the first intermediate gear is smaller than that of the paper feeding gear.

7. The print scanner of claim 6 wherein, The first paper taking transmission gear and the second paper taking transmission gear are coaxially fixed between the second connecting gear and the paper taking gear, and rotationally connected in the casing, the first paper taking transmission gear is engaged with the second connecting gear, and the second paper taking transmission gear is engaged with the paper taking gear. The diameters of the first intermediate gear, the first connecting gear and the second connecting gear are the same, the diameter of the first paper taking transmission gear is larger than that of the second connecting gear, and the diameter of the paper taking gear is larger than that of the second paper taking transmission gear.

8. The print scanner of claim 3 wherein: The first scanning transmission double gear, the second scanning transmission double gear and the second intermediate gear are rotationally connected in the casing, the first scanning transmission double gear is engaged with the scanning paper taking shaft gear through the second scanning transmission double gear and the second intermediate gear, when the clutch structure rotates downward, the second connecting gear is engaged with the first scanning transmission double gear, and then drives the scanning paper taking shaft gear to rotate, and the transmission ratio of the scanning paper taking shaft gear to the scanning paper taking shaft gear is 1:1.

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