A printer with smooth transmission

Abstract

The present invention provides a printer with smooth transmission, comprising a base, a paper bin for storing printing paper and a paper feed roller for driving the printing paper to be transmitted forward, the paper feed roller protrudes from the bottom surface of the paper bin and forms a paper feeding path for the printing paper with the printing roller, a longitudinal load is provided on the printing paper to make the printing paper close to the paper feed roller, the paper feed roller comprises a conveying section and a buffer section, the buffer section protrudes from the conveying section in the radial direction; when the printing paper is separated from the paper feed roller, the buffer section is deformed to absorb at least part of the impact force of the longitudinal load. The present invention reduces the impact of the printing paper leaving the paper feed roller by setting the buffer section, thereby reducing the instantaneous impact of the printing paper during the transmission of the printing roller, and improving the printing quality.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to a printer with stable transmission. Background Art

[0002] The paper feeding part of the printer is connected to the paper feeding roller by a gear through the printing roller. The linear speed of the outer diameter of the printing roller is inconsistent with the linear speed of the outer diameter of the paper feeding roller through different transmission ratios to ensure that no new paper is fed out during printing. Because the paper has a certain thickness, when the printing paper is separated from the paper feeding roller, the remaining printing paper will fall and have an impact on the roller. In addition, because the paper feeding roller is higher than the bottom of the paper bin, the printing paper will be deformed to a certain extent in the paper feeding roller section. Therefore, at the moment when the printing paper is separated from the paper feeding roller, the printing paper will be affected by the impact of the remaining printing paper falling and the height of the roller, causing jitter, resulting in poor printing.

[0003] In view of the above problems, the invention patent with application announcement number CN107639942B discloses a "photo printer" as a photo printer for applying a predetermined temperature to a thermally sensitive color-expressing paper, comprising: a substrate for accommodating the paper; a pickup roller protruding from the bottom surface of the substrate and supplying the accommodated paper forward; a paper pressing roller for discharging the paper supplied by the pickup roller forward; a head formed on the upper part of the paper pressing roller and applying heat to the paper; a motor; a transmission gear meshing with the motor; a first power transmission gear; a first power transmission gear; a second power transmission gear; a first ... The invention comprises a first power transmission part, which connects the transmission gear and the rotating shaft of the paper pressing roller to rotate it; and a second power transmission part, which connects the transmission gear and the rotating shaft of the paper pickup roller to rotate it, and the transmission gear, the first power transmission part and the second power transmission part are formed on the same side of the substrate; the second power transmission part comprises: a clutch gear, which transmits the rotating force of the transmission gear and has a first protrusion formed on one side; a clutch, which is combined with the rotating shaft of the paper pickup roller and has a second protrusion connected to the first protrusion so that the rotating force is transmitted to the paper pickup roller. It has the following disadvantages:

[0004] It only reduces the impact of the remaining printing paper falling when the printing paper separates from the paper feed roller through the clutch. It cannot reduce the problem that when the tail of the printing paper separates from the paper feed roller, the printing paper will generate a momentary impact under the drive of the paper platen roller, causing the printing paper to shake, thus affecting the printing quality. Summary of the invention

[0005] The invention discloses a printer with stable transmission, aiming to improve the problem that the printing effect is affected after the tail of the printing paper separates from the paper feeding roller.

[0006] The present invention adopts the following scheme:

[0007] A printer with smooth transmission, comprising a base, the base being provided with a paper bin for storing printing paper and a paper feed roller for driving the printing paper to be transmitted forward, the paper feed roller protruding from the bottom surface of the paper bin and forming a paper feed path for the printing paper with the printing roller, a longitudinal load being provided on the printing paper so that the printing paper is closely attached to the paper feed roller, the paper feed roller comprising a conveying section and a buffer section, the buffer section protruding from the conveying section in the radial direction;

[0008] When the printing paper is separated from the paper feeding roller, the buffer section is deformed to absorb at least part of the impact force of the longitudinal load.

[0009] As a further improvement, the buffer section has a lower hardness than the conveying section.

[0010] As a further improvement, the buffer section is arranged on both side ends of the conveying section.

[0011] As a further improvement, a buffer groove is provided on the paper bin, and the buffer groove corresponds to the buffer section of the paper feeding roller.

[0012] As a further improvement, the pressure-applying member includes a paper jam member, and paper jam portions for allowing only one sheet of printing paper to pass through are provided on both sides of the paper jam member, and the paper jam portions are located directly above the buffer groove.

[0013] As a further improvement, the conveying section is provided with protrusions for increasing the friction of the printing paper in transmission. As a further improvement, the protrusions are friction strips evenly distributed along the axis direction of the conveying section.

[0014] As a further improvement, the longitudinal load includes a paper pressing member, which applies pressure to the printing paper to make the printing paper close to the paper feeding roller.

[0015] As a further improvement, the buffer section is made of foam material.

[0016] As a further improvement, the printing roller is connected to the paper feeding roller via a gear set.

[0017] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0018] 1. The paper feed roller is provided with a conveying section and a buffer section with a hardness smaller than that of the conveying section, wherein the buffer section protrudes from the conveying section in the radial direction and is made of foam. Under the pressure of the printing paper, the top of the buffer section will be slightly deformed, causing its top to drop to be consistent with the height of the conveying section, but when the printing paper is separated, it will quickly elastically restore. Therefore, when the printing paper is separated from the paper feed roller, the remaining printing paper will first impact the buffer section and then impact the conveying section when it falls. The buffer section can well absorb the impact of the remaining printing paper on it, thereby reducing the impact on the conveying section, reducing the vibration of the printing paper leaving the paper feed roller, and then reducing the instantaneous impact of the printing paper during the transmission of the printing roller, thereby improving the printing quality.

[0019] 2. The conveying section is provided with evenly distributed friction strips along the axial direction to increase the friction between the printing paper and the paper feed roller, so that the printing paper can be better transmitted forward.

[0020] 3. There are buffer grooves on both sides of the paper bin and the buffer grooves are located directly below the paper jam, just at the position where the printing paper is separated from the paper feed roller. When the printing paper is about to separate from the paper feed roller, due to the existence of the buffer grooves, the two ends of the tail of the bottom printing paper will bend downward, thereby first breaking away from the contact with the remaining printing paper. When the printing paper separates from the paper feed roller, the remaining printing paper will not directly give the printing paper a momentary impact when it falls, which will reduce the jitter of the printing paper and thus improve the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Schematic cross-sectional view of AA in the figure;

[0024] Figure 3 yes Figure 1 Schematic diagram of symmetrical cross-section;

[0025] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of C in the middle;

[0026] Figure 5 is a schematic diagram of the structure of the first viewing angle of an embodiment of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the paperboard of the present invention;

[0028] Figure 7 It is a schematic diagram of the connection structure of the clutch structure, gear set, paper feed roller and printing roller of the present invention;

[0029] Icons: 1. Base; 2. Paper feed roller; 3. Print roller; 4. Paper jam; 5. Buffer groove; 6. Gear set; 7. Paper pressing part; 8. Lifting mechanism; 9. Clutch structure; 11. Paper bin; 21. Conveying section; 22. Buffer section; 41. Paper jam; 42. Arch-shaped guide angle; 91. Driving part; 92. Follower; 111. Rib; 211. Friction strip; 221. Normal line; 222. Deformation line. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] Example

[0036] Combination Figure 1 The present embodiment provides a printer with stable transmission, including a base 1, a paper bin 11 for storing printing paper and a paper feed roller 2 for driving the printing paper forward are provided on the base 1, the paper feed roller 2 is located at the front end of the paper bin 11 and protrudes from the bottom surface of the paper bin 11 to contact the printing paper in the paper bin 11, and the bottom printing paper is driven to be transmitted forward by the rotation of the paper feed roller 2, and is transmitted to the printing roller 3 to print the picture and then output, and a paper feeding path for the printing paper is formed between the paper feed roller 2 and the printing roller 3. A longitudinal load is provided on the printing paper to make the printing paper close to the paper feed roller. At the moment of leaving the paper feed roller 2, the longitudinal load will impact the paper feed roller 2. At the same time, when the printing paper is enlarged, it can be seen that its side is not a straight section, so when other printing paper or paper pressing sheet contacts the printing paper to be separated, at the moment of the two leaving, there is a momentary forward impact on the printing paper, which will cause the printing paper to shake, thereby affecting the printing quality. In this embodiment, the longitudinal load is the paper pressing member 7 , and in other embodiments, the longitudinal load is the weight of the printing paper itself, and the printing paper may be one or more sheets stacked in the paper bin 11 .

[0037] like Figures 1 to 4As shown, in order to improve the printing quality and make the printing paper conveyed more smoothly on the paper feeding path, a buffer section 22 is provided on the paper feeding roller 2 to reduce the direct impact of the remaining printing paper on the paper feeding roller 2. Specifically, the paper feeding roller 2 includes a conveying section 21 and a buffer section 22. The buffer section 22 protrudes from the conveying section 21 in the radial direction. In this embodiment, the buffer section 22 is located on both sides of the conveying section 21, and the width of the buffer section 22 is much smaller than the width of the conveying section 21. The conveying section 21 is mainly used to convey the printing paper forward, and a larger width is required to generate friction with the printing paper to convey it forward. If the width of the conveying section 21 is too small, a larger driving force is required to drive the paper feeding roller 2 to convey the printing paper forward, but this is easy to cause the printing paper to deviate, thereby affecting the printing quality of the printing paper. The buffer section 22 has a buffering effect on the direct impact of the remaining printing paper on the paper feeding roller 2. Therefore, the hardness of the buffer section 22 is smaller than that of the conveying section 21, and it can absorb the impact force, thereby playing a buffering role. In order to make the buffer section 22 play a buffering role, the diameter of the buffer section 22 is larger than the diameter of the conveying section 21. In this embodiment, the diameter of the buffer section 22 is 0.5mm larger than the diameter of the conveying section 21, so that the height of the buffer section 22 at the highest point is 0.25mm higher than the conveying section 21. The thickness of the printing paper is about 0.1 to 0.3mm. The pressure applied to the multi-layer printing paper will not be too high, so that the highest point of the buffer section 22 can be aligned with the highest point of the conveying section 21 after elastic deformation downward, so that the paper feed roller 2 can convey the printing paper forward. Of course, a paper pressing member 7 can also be provided on the printing paper. Under the pressure of the pressure member, the highest point of the buffer section 22 will also be elastically deformed to be aligned with the highest point of the conveying section 21, so that the printing paper is close to the paper feed roller 2. At the moment when the tail of the printing paper leaves the paper feed roller 2, the buffer section 22 will lose pressure and return to its original state in an instant, and the speed of the printing paper falling is less than the instantaneous restoring elastic force of the buffer section 22, so that when the remaining printing paper falls, it will first abut against the buffer section 22. Since the hardness of the material of the buffer section 22 is smaller than that of the conveying section 21 and has an absorption function, when the remaining printing paper falls and abuts against the conveying section 21, its falling impact force has been absorbed and reduced by the buffer section 22, thereby greatly reducing the impact on the paper feed roller 2, thereby reducing the vibration of the printing paper leaving the paper feed roller 2, and further reducing the instantaneous impact of the printing paper during the transmission of the printing roller 3, thereby improving the printing quality. In this embodiment, the hardness of the conveying section 21 is twice the hardness of the buffer section 22. In other embodiments, the hardness of the conveying section 21 is three times the hardness of the buffer section 22. Of course, the higher the hardness multiple, the better. It is necessary to ensure that the buffer section 22 has a certain elastic deformation and needs to restore its original shape without the action of pressure.

[0038] Reference Figure 4As shown, when the paper feed roller 2 is not under pressure, the upper part of the buffer section 22 is on the normal line 221 and is also circular. When the buffer section 22 receives the printing paper or the pressure of the paper pressing member 7, the upper part of the buffer section 22 will become the deformation line 222, and the upper part will be elliptical, so that the highest point drops to be consistent with the height of the conveying section 21.

[0039] In this embodiment, preferably, the buffer section 22 is made of foam material, which has a series of characteristics such as elasticity, light weight, rapid pressure-sensitive fixation, easy use, flexible bending, ultra-thin volume, and reliable performance. The buffer section 22 can be elastically bent when subjected to the pressure of the printing paper, and can elastically recover when the pressure disappears, and can absorb energy to play a buffering role. In another embodiment, the buffer section 22 can also be flexible rubber.

[0040] like Figure 3 As shown, a protrusion for increasing the friction of the printing paper is provided on the conveying section 21. In this embodiment, the protrusion is a friction strip 211 evenly distributed along the axial direction of the conveying section 21. The friction strip 211 is a cylinder with a diameter ratio very small compared to the conveying section 21. The friction strip 211 is evenly distributed along the entire axis of the conveying section 21, so that the outer surface of the conveying section 21 becomes a small rotating shaft. During the rotation process, the friction between the printing paper and the paper feeding roller 2 can be increased, so that the printing paper is better transported forward, and the deformation of the buffer sections 22 on both sides of the paper feeding roller 2 cannot rotate well in a circle, which will easily cause the printing paper to deviate, affecting the printing effect.

[0041] Reference Figure 1 and Figure 2The paper feed roller 2 protrudes from the bottom of the paper bin 11, causing the printing paper to arch in the middle, which makes it easy for the printing paper to have a gap between the printing papers and is not easy to be adsorbed together. In order to prevent the transmission of multiple printing papers at a time, which will affect the printing quality, a paper jam 4 is provided on the paper feeding path, and a paper jam part 41 is provided on both sides of the paper jam 4 for only allowing one printing paper to pass. The printing paper in the paper feed roller 2 section of the paper bin 11 has not only an arched part in the middle, but also parts on both sides that are close to the bottom of the paper bin 11. In this way, the contact section where the printing paper contacts the paper feed roller 2 is arched to form a high middle and low two side edges. There is no buffer section 22 on the two side edges when the remaining printing paper falls. At the moment when the printing paper leaves the paper feed roller 2, the remaining printing paper will give the printing paper a forward impulse driven by the printing roller 3, causing the printing paper to shake, which will affect the printing quality. Buffer grooves 5 are provided on the paper bins 11 on both sides of the paper feed roller 2. The buffer grooves 5 are located below the paper jam 4. The width of the buffer grooves 5 at least includes the width extending from the bottom of the paper jam 4 to the paper feed roller 2, and at least exceeds the extension line of the front end of the paper feed roller 2 to fit the lower two sides of the printing paper, so that the tails of the lower two sides of the printing paper can be placed on the buffer grooves 5 before leaving the paper feed roller 2. When the tail of the printing paper is transmitted to the buffer groove 5, the lower two sides will be suspended, thereby bending downward and breaking away from the contact with the front end of the remaining printing paper. When the printing paper continues to be transmitted forward and leaves the paper feed roller 2, the remaining printing paper will not directly give the printing paper a momentary impact when it falls, which will reduce the shaking of the printing paper, thereby improving the printing quality.

[0042] In this embodiment, the paper bin 11 is provided with a raised rib 111, so that there is a gap between the printing paper and the bottom of the paper bin 11, so as to prevent the printing paper from generating static adsorption, which causes the printing paper to be unable to be normally transmitted and idling. The buffer groove 5 is provided on the rib 111, so that the bottom of the paper bin 11 is easier to manufacture. Preferably, the buffer groove 5 is a trapezoidal opening, which can increase the width of the buffer groove 5, and can also make the tail of the printing paper slowly bend along the edge of the trapezoidal opening after entering the buffer groove 5, instead of falling instantly, so that the bending force of the printing paper can be reduced, thereby reducing the shaking of the printing paper.

[0043] In this embodiment, the opening edge of the buffer groove 5 cannot exceed the axial position of the paper feed roller 2, that is, the opening edge of the buffer groove 5 will not exceed the axial position of the highest point of the paper feed roller 2 protruding from the paper bin 11, because the printing paper is mainly transported forward by the friction between the printing paper and the axis of the highest point of the paper feed roller 2. If the opening edge of the buffer groove 5 exceeds the axial position of the highest point of the paper feed roller 2 protruding from the paper bin 11, the two lower sides of the printing paper will bend downward at this point, reducing the power of the printing paper to be transported forward, and the friction force of the printing paper will be too small, which will make the positions of the two sides of the printing paper easily shift during the transmission process, thereby affecting the printing quality.

[0044] Reference Figure 6 The middle part of the end surface of the paper jam 4 facing the paper bin 11 is formed with an arch-shaped chamfer 42. The shape of the arch-shaped chamfer 42 is adapted to the shape of the printing paper with the middle part arched, and is used to guide the printing paper with the middle part arched. During the transmission by the paper feed roller 2, the height between the highest point of the arch in the middle of the bottom printing paper and the bottom of the printing paper accommodating cavity may be greater than the middle part of the paper jam 4. The arch-shaped chamfer 42 is set so that the arch in the middle of the bottom printing paper will slowly flatten and pass through the paper jam 4 during transmission, and it will not abut against the stopper and cannot pass, which will require a greater transmission force and cause the printing paper to jam.

[0045] Reference Figure 1 and Figure 5 , and also includes a lifting mechanism 8 that makes the paper feed roller 2 rise when feeding paper and descend when the printing paper is separated from the paper feed roller 2. The paper feed roller 2 can adjust the height with the bottom of the paper bin 11 through the lifting structure, rise to transfer the printing paper to the printing roller 3, and descend to reduce the instantaneous impact and shaking of the printing paper when the tail of the printing paper is separated from the paper feed roller 2, causing the printing paper to shake and affect the printing quality. In this embodiment, the lifting mechanism 8 drives the paper feed roller 2 to rise or fall in parallel, so that the paper feed roller 2 will not tilt during the rising or falling process, causing the size of the force applied by the printing paper on the buffer sections 22 on both sides to be different, resulting in the deviation of the printing paper during the transmission process, thereby affecting the printing quality.

[0046] Reference Figure 1 and Figure 7 The printing roller 3 is connected to the paper feed roller 2 through the gear set 6. The printing roller 3 drives the paper feed roller 2 to rotate through the gear set 6. The buffer section 22 can also reduce the impact caused by the falling of the printing paper from the gear set 6 to the printing roller 3, thereby affecting the printing quality of the printing paper. In this embodiment, the gear set 6 has the function of a speed reducer, that is, the rotation speed of the printing roller 3 is greater than the rotation speed of the paper feed roller 2.

[0047] A clutch structure 9 is provided between the gear set 6 and the paper feed roller 2. The clutch structure 9 includes a driving member 91 connected to the gear set 6 and a driven member 92 driving the paper feed roller 2 to rotate. There is a certain idling stroke between the driving member 91 and the driven member 92. At the beginning, the driving member 91 drives the driven member 92 to rotate, thereby driving the paper feed roller 2 to rotate. After the printing paper is transmitted to the printing roller 3, the printing roller 3 drives the printing paper to continue to move forward at a faster rotation speed. Under the pressure of the paper pressing member 7, the printing paper will drive the paper feed roller 2 to rotate at the same rotation speed. In this way, the rotation speed of the driven member 92 fixed on the paper feed roller 2 will exceed the speed of the driving member 91 driving it to rotate, and enter the idling stroke stage, so that the clutch structure 9 will be separated. When the printing paper leaves the paper feed roller 2, since the driving member 91 is not in contact with the driven member 92 and does not drive the rotation of the driven member 92, the paper feed roller 2 will be briefly paused until the driving member 91 rotates and contacts the driven member 92 again to drive the rotation of the paper feed roller 2 and transmit the printing paper forward again. By using the clutch structure 9 to allow the paper feed roller 2 to feed the paper at intervals, the printing paper in the process of printing can be prevented from being caught up by the subsequent printing paper due to the too fast transmission speed, resulting in double printing of the printing paper. This is conducive to smooth transmission and improved printing quality.

[0048] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A printer with smooth transmission, comprising a base (1), wherein the base (1) is provided with a paper bin (11) for storing printing paper and a paper feed roller (2) for driving the printing paper to be transmitted forward, wherein the paper feed roller (2) protrudes from the bottom surface of the paper bin (11) and forms a paper feeding path for the printing paper with a printing roller (3), and a longitudinal load is provided on the printing paper so that the printing paper is closely attached to the paper feed roller (2), characterized in that: The paper feed roller (2) comprises a conveying section (21) and a buffer section (22), wherein the buffer section (22) protrudes radially from the conveying section (21); When the printing paper is separated from the paper feeding roller (2), the buffer section (22) is deformed to absorb at least part of the impact force of the longitudinal load; wherein a paper jam (4) is provided on the paper feeding path, and buffer grooves (5) are provided on the paper bins (11) on both sides of the paper feeding roller (2), the buffer grooves (5) are located below the paper jam (4), and the opening edge of the buffer groove (5) does not exceed the axial position of the paper feeding roller (2).

2. A printer with smooth transmission according to claim 1, characterized in that: The buffer section (22) has a lower hardness than the conveying section (21).

3. A printer with smooth transmission according to claim 2, characterized in that: The buffer section (22) is arranged on both side ends of the conveying section (21).

4. A printer with smooth transmission according to claim 3, characterized in that: The buffer groove (5) corresponds to the buffer section (22) of the paper feeding roller (2).

5. A printer with smooth transmission according to claim 4, characterized in that: The two sides of the paper jam piece (4) are provided with paper jam portions (41) for allowing only one piece of printing paper to pass through, and the paper jam portions (41) are located directly above the buffer groove (5).

6. A printer with smooth transmission according to claim 1, characterized in that: The conveying section (21) is provided with a protrusion for increasing the friction force of transmitting printing paper.

7. A printer with smooth transmission according to claim 6, characterized in that: The protrusions are friction strips (211) evenly distributed along the axial direction of the conveying section (21).

8. A printer with smooth transmission according to claim 1, characterized in that: The longitudinal load comprises a paper pressing member (7), and the paper pressing member (7) applies pressure to the printing paper so that the printing paper is closely attached to the paper feeding roller (2).

9. A printer with smooth transmission according to any one of claims 1 to 7, characterized in that: The buffer section (22) is made of foam material.

10. A printer with smooth transmission according to claim 1, characterized in that: The printing roller (3) is connected to the paper feeding roller (2) via a gear set (6).

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