A synchronous paper feeding device and a printing device

Abstract

The application provides a synchronous paper feeding device and a printing equipment, and relates to the technical field of printing. The synchronous paper feeding device comprises a paper feeding assembly and a paper collecting assembly. The paper feeding assembly comprises a power piece and a pressing piece. The power piece is provided with a first clamping part which is rotatably arranged on the power piece. The pressing piece is provided with a second clamping part which is rotatably arranged on the pressing piece. A paper roller is clamped between the first clamping part and the second clamping part. The power piece is provided with a motor which is used for driving the first clamping part to rotate. The paper collecting assembly comprises a driving piece and a winding roller. The driving piece can drive the winding roller to rotate. The paper discharged from the paper roller can be wound on the winding roller after printing. In use, the paper roller rotates actively to discharge the paper and perform the printing operation. Meanwhile, the winding roller also rotates synchronously to wind the printed paper on the winding roller. The movement of the paper is realized by the cooperation of the paper roller and the winding roller, and the friction force between the paper and the paper pressing wheel or the paper feeding shaft is no longer relied on, so that the stepping of the application is more accurate.

Description

Technical Field

[0001] This application relates to the field of printing technology, and more specifically, to a synchronous paper feeding device and a printing apparatus. Background Technology

[0002] The paper feeding structure, also known as the paper feed structure or paper delivery structure in printing equipment, refers to the entire mechanical system in printing equipment responsible for feeding paper from the paper tray into the printing channel.

[0003] In related technologies, paper feeding structures typically rely on pressure rollers and paper feed shafts, using the friction between the pressure rollers and the paper for feeding, which can lead to inaccurate stepping. Utility Model Content

[0004] In order to at least address some of the deficiencies mentioned in the related technologies, this application provides a synchronous paper feeding device and a printing device.

[0005] To achieve the above objectives, this application provides a synchronous paper feeding device, including a paper feeding assembly and a paper receiving assembly. The paper feeding assembly includes a power component and a clamping component. A first engaging portion is rotatably disposed on the power component, and a second engaging portion is rotatably disposed on the clamping component. A paper feed roller is engaged between the first and second engaging portions. A motor for driving the first engaging portion to rotate is disposed on the power component. The paper receiving assembly includes a driving component and a take-up roller. The driving component can drive the take-up roller to rotate. The paper fed from the paper feed roller, after printing, can be wound around the take-up roller.

[0006] Furthermore, the power component includes a frame, and the motor and the first locking part are both mounted on the frame. An angular displacement sensor is installed on the frame near the motor to detect the rotation of the motor.

[0007] Furthermore, one end of the motor is provided with an output shaft, which drives the first locking part to rotate via a transmission component. A detection shaft is provided at the end of the motor away from the output shaft. The detection shaft is coaxial with the output shaft and rotates synchronously. The angular displacement sensor can detect the rotation of the detection shaft.

[0008] Furthermore, a disk is provided at one end of the detection shaft away from the motor, and the disk is concentrically arranged with the detection shaft; the edge of the disk extends into the detection area of ​​the angular displacement sensor.

[0009] Furthermore, the transmission component includes a first gear, a second gear, and a third gear; the first gear meshes with the second gear, and the second gear meshes with the third gear. The first gear is disposed at the end of the output shaft of the motor, and the second gear and the third gear are both rotatably mounted on the frame. The third gear is used to drive the first locking part to rotate.

[0010] Furthermore, the diameter of the first gear is L1, the diameter of the second gear is L2, and the diameter of the third gear is L3, satisfying: L3 > L2 > L1.

[0011] Furthermore, a belt assembly is provided between the third gear and the first engaging portion. The belt assembly includes a pulley, which is installed at the end of the first engaging portion to drive the first engaging portion to rotate. The third gear is mounted on the frame via a rotating shaft, on which a belt portion is provided, and a belt is sleeved between the belt portion and the pulley.

[0012] Furthermore, the diameter of the pulley is larger than the diameter of the belt section.

[0013] Furthermore, the clamping member includes a bracket, the second locking portion is slidably mounted on the bracket, and the second locking portion is slidable in a direction close to or away from the first locking portion.

[0014] Furthermore, the bracket is provided with a sliding member, and the second locking portion is rotatably mounted on the end of the sliding member facing the first locking portion. The sliding member is slidably mounted on the bracket and can be fixed relative to the bracket.

[0015] This application also provides a printing apparatus, including a printer and the synchronous paper feeding device described in any of the above embodiments, wherein the printer is used to perform printing operations on paper.

[0016] With the above technical solution, when using the synchronous paper feeding device of this application to perform printing operations, one end of the paper feed roller is engaged with the first engaging part of the power component, and then the second engaging part on the clamping component is engaged with the other end of the paper feed roller, thus engaging the paper feed roller between the first engaging part and the second engaging part. The motor is started, and the motor drives the first engaging part to rotate, which in turn drives the paper feed roller to rotate, releasing the paper from the paper feed roller. Simultaneously, another driving component also drives the take-up roller to rotate, so that the paper extending from the paper feed roller, after being printed by the printer, is wound onto the take-up roller.

[0017] In this application's synchronous paper feeding device, the paper feed roller actively rotates to release the paper for printing. Simultaneously, the take-up roller also rotates synchronously to rewind the printed paper onto its winding mechanism. The paper movement is achieved through the cooperation of the paper feed roller and the take-up roller, no longer relying solely on the friction between the pressure roller or the paper feed shaft and the paper, thus making the stepping more accurate.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the power component provided in an embodiment of this application from one perspective; Figure 2 A structural schematic diagram of the power component provided in an embodiment of this application from another perspective; Figure 3 This is a schematic diagram of the paper feeding assembly of the synchronous paper feeding device provided in an embodiment of this application.

[0021] icon: 100-Power component; 110-First locking part; 120-Frame; 130-Motor; 131-Output shaft; 132-Detection shaft; 133-Disc; 134-Angular displacement sensor; 141-First gear; 142-Second gear; 143-Third gear; 150-Belt assembly; 151-Pulley; 152-Belt; 200-Securing component; 210-Second locking part; 220-Bracket; 230-Sliding component. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] This embodiment provides a synchronous paper feeding device to solve the problem in related technologies where the paper moves by relying on the friction between the paper pressure roller or paper feed shaft and the paper during printing, resulting in inaccurate stepping.

[0026] Please see Figures 1 to 3 This embodiment provides a synchronous paper feeding device, including a paper feeding assembly and a paper receiving assembly. The paper feeding assembly includes a power component 100 and a clamping component 200. A first engaging portion 110 is rotatably disposed on the power component 100, and a second engaging portion 210 is rotatably disposed on the clamping component 200. The paper feed roller is engaged between the first engaging portion 110 and the second engaging portion 210. A motor 130 for driving the first engaging portion 110 to rotate is disposed on the power component 100. The paper receiving assembly includes a driving component and a take-up roller. The driving component can drive the take-up roller to rotate. The paper fed from the paper feed roller can be wound onto the take-up roller after printing.

[0027] Specifically, when using the synchronous paper feeding device of this embodiment, the paper to be printed is wound onto the paper feed roller. After winding, the paper feed roller is engaged between the first engaging part 110 and the second engaging part 210, and the clamping member 200 is controlled to move towards the power member 100 until the paper feed roller is reliably engaged by the first engaging part 110 and the second engaging part 210.

[0028] When a printing operation is required, the motor 130 on the power unit 100 is started, which drives the first latching part 110 to rotate. The first latching part 110 can then drive the paper feed roller to rotate. The rotation of the paper feed roller can release the paper, which is then guided by the operator through the printer for printing.

[0029] After printing, the paper is wound onto the take-up roller by the operator. Once wound, automatic printing can begin. Simultaneously, motor 130 and the drive unit are activated, causing the feed roller and take-up roller to move synchronously. After being released from the feed roller, the paper passes through the printer and is then wound back up by the take-up roller. The paper movement is accomplished by the synchronously moving feed roller and take-up roller, eliminating the reliance on the friction between the pressure roller or paper feed shaft and the paper, thus making the paper movement more accurate.

[0030] It is worth mentioning that traditional printers rely on pressure rollers or paper feed shafts to move the paper. When the last section of paper on the feed roller is used, the paper is dragged off the feed roller by the pressure roller, losing its tension and becoming unusable for printing, resulting in waste. In this embodiment, because the paper is driven by both the feed roller and the take-up roller, even if the last section of paper is pulled off the feed roller, the take-up roller continues to move the paper, keeping it taut between the printer and the take-up roller. This ensures that the last section of paper is at least partially utilized, reducing paper waste.

[0031] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, the power unit 100 includes a frame 120, a motor 130, and a first latching part 110, all mounted on the frame 120. An angular displacement sensor 134 is installed on the frame 120 near the motor 130 to detect the rotation of the motor 130. The angular displacement sensor 134 can monitor the angle rotated by the motor 130 in real time, thereby accurately calculating the rotation amount of the paper feed roller. Since the paper feed roller directly drives the paper movement, its rotation angle has a strict correspondence with the distance the paper travels. Compared to the traditional friction-driven, slippery paper pressure roller structure, this solution, through closed-loop feedback control, ensures accurate paper length for each step, avoiding image misalignment or content duplication / missing due to inaccurate stepping.

[0032] During synchronous paper feeding, the feed roller and take-up roller must operate in coordination; otherwise, the paper may become loose or break. The angular displacement sensor 134 provides real-time speed and position signals. In this embodiment, the control system connected to an external data connection can dynamically adjust the speed of the motor 130 based on these signals to ensure that it matches the linear speed of the take-up roller, thereby achieving synchronous paper feeding, maintaining constant tension of the paper throughout the printing channel, and preventing wrinkles, shifts, or paper jams.

[0033] In one embodiment, exemplarily, such as Figures 1 to 3As shown, one end of the motor 130 is provided with an output shaft 131, which drives the first locking part 110 to rotate through a transmission component. A detection shaft 132 is provided at the end of the motor 130 away from the output shaft 131. The detection shaft 132 is coaxial with the output shaft 131 and rotates synchronously. The angular displacement sensor 134 can detect the rotation of the detection shaft 132. The output shaft 131 end is usually connected to the transmission component, and the working environment may contain vibrations, dust, oil, etc. Furthermore, the output shaft 131 end is usually susceptible to external impacts, and the limited space makes sensor wiring and installation difficult. If the angular displacement sensor 134 is installed on the output shaft 131 side, it is easily affected by the above factors, leading to sensor damage, signal distortion, or maintenance difficulties. However, placing the sensor at the non-output end of the motor 130, i.e., the detection shaft 132 end, provides more space, facilitates installation and wiring, is away from transmission components, reduces mechanical interference and contamination, and experiences less stress, resulting in more stable operation and extended sensor lifespan.

[0034] Understandably, many servo motors 130 or stepper motors 130 have pre-installed extension shafts at the non-output ends for mounting encoders or sensors. Utilizing this standard structure, no additional adapter mechanism is needed to adapt to the universal angular displacement sensor 134, reducing design costs, increasing modularity, and ensuring consistent sensor mounting when replacing the motor 130, facilitating maintenance.

[0035] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, a disk 133 is mounted on the end of the detection shaft 132 away from the motor 130, and the disk 133 is concentrically positioned with the detection shaft 132; the edge of the disk 133 extends into the detection area of ​​the angular displacement sensor 134. Placing the edge of the disk 133 within the detection area of ​​the angular displacement sensor 134 constitutes a rotational encoding detection structure. When the detection shaft 132 rotates, the disk 133 rotates synchronously. The sensor detects the periodic changes in the edge of the disk 133 and outputs pulse signals to calculate the rotation angle, rotational speed, and direction.

[0036] The angular displacement sensor 134 can be any existing equipment or component, as long as it meets the requirements of this embodiment. For example, the angular displacement sensor 134 can be set as a photoelectric or magnetoelectric sensor. Correspondingly, the edge of the disk 133 can be provided with equidistant light-transmitting or light-blocking grooves, magnetic rings with alternating magnetic poles, etc., as needed, so as to cooperate with the corresponding sensor and ensure accurate detection.

[0037] Because the disk 133 and the detection shaft 132 are concentrically set, and the edge trajectory is stable during rotation, the distance from the sensor detection point to the center of rotation is kept constant. This avoids signal fluctuations caused by eccentricity or shaking, and also ensures consistent output pulse periods. The angular displacement and output signal have a good linear relationship, and even with multiple starts and stops or forward and reverse rotations during use, the position repeatability is good, which is beneficial for accurate positioning.

[0038] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, the transmission components include a first gear 141, a second gear 142, and a third gear 143; the first gear 141 meshes with the second gear 142, and the second gear 142 meshes with the third gear 143. The first gear 141 is located at the end of the output shaft 131 of the motor 130, and the second gear 142 and the third gear 143 are both rotatably mounted on the frame 120. The third gear 143 is used to drive the first locking part 110 to rotate. The motor 130 typically outputs high speed and low torque, while the paper feed roller requires smooth and powerful low-speed rotation to ensure stable paper feeding. By rationally designing the gear ratios, speed reduction transmission can be achieved. While reducing speed, the output torque increases accordingly, enhancing the driving capability of the paper feed roller. Furthermore, by controlling the number and size of the teeth of different gears, the paper feed roller of this embodiment can adapt to different paper types, such as thick paper, label paper, and roll film, avoiding slippage or stalling during startup.

[0039] The three gears are arranged in a linear meshing pattern, allowing for flexible adjustment of the power transmission path. For example, the output shaft 131 of the motor 130 may be horizontally arranged, while the first snap-fit ​​part 110 may need to be installed vertically or offset. By using the second gear 142 as a transition, power steering and position transfer can be completed within a limited space, making the overall structure more compact and easy to integrate into the narrow space inside the printer.

[0040] Compared to flexible transmission methods such as belts and chains, gear meshing is a rigid connection, with no slippage, no elastic elongation, fast start / stop response, and good dynamic performance. It is particularly suitable for scenarios requiring precise synchronous control, as described in this embodiment, to avoid the paper feed roller missing steps or lagging behind.

[0041] In one embodiment, exemplarily, such as Figures 1 to 3As shown, the diameter of the first gear 141 is L1, the diameter of the second gear 142 is L2, and the diameter of the third gear 143 is L3, satisfying L3 > L2 > L1. This gear set constitutes a multi-stage reduction transmission chain. Each pair of meshing gears produces a certain reduction ratio. In other words, there is a reduction and torque increase effect between each pair of meshing gears. The overall reduction ratio is large, and the final output speed to the first engagement part 110 is significantly reduced, while the output torque is greatly amplified. In this way, even if a small high-speed motor 130 is used, it can drive a relatively heavy or high-resistance paper roll. At the same time, it can maintain a smooth start and avoid the motor 130 from stalling or losing steps due to excessive instantaneous load.

[0042] Using only two gear stages to achieve a large reduction ratio may result in an excessively large meshing angle, stress concentration on the tooth surfaces, or uneven transmission, leading to noise and vibration. However, distributing the total reduction ratio appropriately across two stages ensures a moderate transmission ratio for each stage, smoother meshing, even gear stress, less wear, and higher transmission efficiency. This achieves step-by-step speed reduction and smooth torque increase, balancing performance and reliability.

[0043] It should also be noted that in the above embodiment, the angular displacement sensor 134 can detect the rotation of the motor 130. In this embodiment, the reduction ratio is relatively large, meaning that for every multiple rotations of the motor 130, the first locking part 110 rotates only one rotation or less. The minute rotation of the paper feed roller corresponds to the large rotation of the motor 130, effectively increasing the resolution of the angular displacement sensor 134. Specifically, if the total reduction ratio is 10:1, then for every 10 rotations of the motor 130, the paper feed roller rotates only one rotation. Furthermore, if the sensor detects an error of ±1° in the rotation angle of the motor 130, the error reflected on the paper feed roller is only ±0.1°. This results in extremely small paper feed errors, achieving high-precision stepping control.

[0044] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, a belt assembly 150 is also provided between the third gear 143 and the first engagement part 110. The belt assembly 150 includes a pulley 151, which is installed at the end of the first engagement part 110 to drive the first engagement part 110 to rotate. The third gear 143 is mounted on the frame 120 via a rotating shaft, on which a belt part is provided. A belt 152 is sleeved between the belt part and the pulley 151. Although the front gear transmission has high rigidity and precision, the gear meshing itself will generate a certain amount of periodic vibration and noise, especially during start-up, stop, or speed change. The belt 152, as an elastic intermediate component, can effectively buffer and absorb the vibration during the transmission process, preventing the small impact of gear meshing from being directly transmitted to the first engagement part 110 and the paper feed roller, making the paper feeding process smoother, reducing vibration, and preventing blurry or misaligned printed images.

[0045] When there is a certain distance between the third gear 143 and the first engagement part 110, if pure gear transmission is used, more intermediate gears are required, resulting in a complex structure. However, belt transmission 152 can easily bridge a certain space and achieve non-collinear power transmission. For example, if the third gear 143 is located in the middle of the frame 120 and the first engagement part 110 is located near the top, the belt 152 can be flexibly arranged to avoid structural congestion and improve the freedom and compactness of the overall structural design.

[0046] Furthermore, in terms of safety, the belt 152 may slip or break under extreme overload conditions, such as severe paper jamming or the paper feed roller being stuck by foreign objects. The slippage or breakage of the belt 152 effectively protects the motor 130 from stalling and burning out, and also prevents damage to gears and shafts due to excessive torque, reducing maintenance costs and improving the safety of this embodiment.

[0047] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, the diameter of pulley 151 is larger than the diameter of the belt section. Because the diameter of pulley 151 is larger than the diameter of the belt section, this stage of transmission is a reduction transmission, which further reduces the output speed of the paper feed roller, making the rotation of the paper feed roller smoother; at the same time, the output torque is amplified again, correspondingly enhancing the driving capability of the paper feed roller. Even when dealing with thick paper, high tension, or at the moment of start-up, it can rotate reliably, avoiding slippage or stalling, and improving the control accuracy and driving capability of the final output end.

[0048] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, the clamping member 200 includes a bracket 220, and a second locking portion 210 is slidably mounted on the bracket 220. The second locking portion 210 can slide towards or away from the first locking portion 110. Traditional fixed locking structures require precise alignment of the paper feed roller for installation, which is difficult to operate. In this embodiment, the second locking portion 210 can slide away from the first locking portion 110, forming an open space between the first locking portion 110 and the second locking portion 210. This allows the operator to first insert one end of the paper feed roller into the first locking portion 110, then insert the other end into the second locking portion 210, and then push the second locking portion 210 to slide closer to complete the clamping. Installation can be completed without aligning the axis, significantly reducing the difficulty of operation and improving the efficiency of paper roll replacement.

[0049] Furthermore, in actual use, the paper feed roller may have issues such as length tolerance, differences in the outer diameter of the paper roll, or incomplete parallelism of the two ends of the shaft. The sliding second locking part 210 can be freely adjusted on the bracket 220 to automatically compensate for the length deviation of the paper feed roller. Even if the paper feed roller is slightly longer or shorter, reliable locking can be achieved through sliding adjustment, avoiding installation stress or inability to install caused by rigid fixing, and improving the compatibility and versatility of the equipment with different consumables.

[0050] The second latching part 210 is slidable, meaning that a controllable clamping force can be applied to the second latching part 210 by external force, such as a spring, air pressure, or a manual knob. This ensures that both ends of the paper feed roller are evenly clamped, avoiding problems such as bearing wear, latching part deformation, paper feed roller tilting, or paper deviation caused by unilateral force. It also keeps the axis of the paper feed roller parallel to the printing channel, ensuring smooth paper delivery.

[0051] In one embodiment, exemplarily, such as Figures 1 to 3 As shown, a sliding member 230 is provided on the bracket 220, and a second engaging portion 210 is rotatably mounted on the end of the sliding member 230 facing the first engaging portion 110. The sliding member 230 is slidably mounted on the bracket 220 and can be fixed relative to the bracket 220. The sliding member 230 is responsible for sliding along the bracket 220 to achieve position adjustment. The second engaging portion 210 rotates at the end of the sliding member 230 to transmit power. After sliding into position, the sliding member 230 is fixed relative to the bracket 220, locking the position. In this way, when installing the paper feed roller, the sliding member 230 can move freely, facilitating alignment. After installation, the sliding member 230 is fixed to the bracket 220 by locking mechanisms such as knobs, buckles, pins, etc., so that the second engaging portion 210 can be stably driven during operation without the risk of shaking or backlash.

[0052] This embodiment also provides a printing device, including a printer and the synchronous paper feeding device described in any of the above embodiments, wherein the printer is used to perform printing operations on paper.

[0053] The printing device in this embodiment includes the synchronous paper feeding device in any of the above embodiments, and thus possesses all the beneficial effects of the synchronous paper feeding device, which will not be described in detail here.

[0054] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A synchronous paper feeding device, characterized in that, include: A paper feeding assembly includes a power component (100) and a clamping component (200). The power component (100) is rotatably provided with a first latching part (110), and the clamping component (200) is rotatably provided with a second latching part (210). The paper feed roller is latched between the first latching part (110) and the second latching part (210). The power component (100) is provided with a motor (130) for driving the first latching part (110) to rotate. The paper receiving assembly includes a drive unit and a take-up roller. The drive unit can drive the take-up roller to rotate. The paper fed from the paper feed roller can be wound around the take-up roller after printing.

2. The synchronous paper feeding device according to claim 1, characterized in that, The power component (100) includes a frame (120), and the motor (130) and the first snap-fit ​​part (110) are both mounted on the frame (120); An angular displacement sensor (134) is provided on the frame (120) near the motor (130) to detect the rotation of the motor (130).

3. The synchronous paper feeding device according to claim 2, characterized in that, One end of the motor (130) is provided with an output shaft (131), and the output shaft (131) drives the first snap-fit ​​part (110) to rotate through the transmission component; A detection shaft (132) is provided at one end of the motor (130) away from the output shaft (131). The detection shaft (132) is coaxially arranged with the output shaft (131) and rotates synchronously. The angular displacement sensor (134) can detect the rotation of the detection shaft (132).

4. The synchronous paper feeding device according to claim 3, characterized in that, A disk (133) is provided at one end of the detection shaft (132) away from the motor (130), and the disk (133) is concentrically arranged with the detection shaft (132); the edge of the disk (133) extends into the detection area of ​​the angular displacement sensor (134).

5. The synchronous paper feeding device according to claim 3, characterized in that, The transmission component includes a first gear (141), a second gear (142), and a third gear (143); the first gear (141) meshes with the second gear (142), and the second gear (142) meshes with the third gear (143); The first gear (141) is disposed at the end of the output shaft (131) of the motor (130), and the second gear (142) and the third gear (143) are rotatably mounted on the frame (120). The third gear (143) is used to drive the first snap-fit ​​part (110) to rotate.

6. The synchronous paper feeding device according to claim 5, characterized in that, The diameter of the first gear (141) is L1, the diameter of the second gear (142) is L2, and the diameter of the third gear (143) is L3, satisfying: L3 > L2 > L1.

7. The synchronous paper feeding device according to claim 5, characterized in that, A belt assembly (150) is also provided between the third gear (143) and the first engaging part (110). The belt assembly (150) includes a pulley (151), which is installed at the end of the first engaging part (110) to drive the first engaging part (110) to rotate. The third gear (143) is mounted on the frame (120) via a rotating shaft. A belt section is provided on the rotating shaft, and a belt (152) is sleeved between the belt section and the pulley (151).

8. The synchronous paper feeding device according to claim 7, characterized in that, The diameter of the pulley (151) is larger than the diameter of the belt section.

9. The synchronous paper feeding device according to claim 1, characterized in that, The clamping member (200) includes a bracket (220), the second snap-fit ​​portion (210) is slidably mounted on the bracket (220), and the second snap-fit ​​portion (210) is slidable in a direction close to or away from the first snap-fit ​​portion (110).

10. A printing device, characterized in that, The device includes a printer and a synchronous paper feeding device as described in any one of claims 1 to 9, wherein the printer is used to perform printing operations on paper.

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