An automatic paper feeding device

Abstract

The application discloses an automatic paper feeding device, a paper conveying channel is formed between an upper shell and a paper conveying plate of the automatic paper feeding device, at least part of a paper taking wheel and at least part of a paper separating wheel are located in the paper conveying channel to convey paper, a paper pressing part is arranged on the upper shell and can be close to or away from the paper taking wheel during rotation, an elastic guide part is arranged on the paper conveying plate, the elastic guide part is used for guiding paper to be placed between the paper pressing part and the paper taking wheel, and the elastic guide part is configured as follows: in an initial state, the elastic guide part protrudes from an upper surface of the paper conveying plate, when a preset pressure is applied to the elastic guide part, the elastic guide part can be elastically deformed under the action of the preset pressure and move towards the direction of the paper conveying plate, and the elastic guide part is reset to the initial state when the preset pressure is removed. When the number of papers is large and the stacking height is high, the contact area of the paper and the paper taking wheel can be increased, so that the paper taking wheel can take paper smoothly without excessive paper pressure.

Description

Technical Field

[0001] This application relates to the field of printing equipment technology, and more particularly to an automatic paper feeding device. Background Technology

[0002] Automatic paper feeding devices utilize a wheel assembly to perform paper picking and separating functions. This assembly includes a picking wheel and a separating wheel, with a pressure plate above the picking wheel. During operation, the picking wheel rotates, and with the assistance of the pressure plate, friction forces the paper in contact with the picking wheel in the paper stack towards the separating wheel. The separating wheel then assists in the smooth forward movement of the paper. A paper transport channel is formed between the upper housing of the automatic paper feeding device and the feed board. The picking wheel is typically higher than the feed board and located within this channel. In existing technology, a guide is usually placed at the front end of the picking wheel to guide the paper between the picking wheel and the pressure plate. However, when the quantity of paper is large, this increases the pressure between the paper and the picking wheel, causing the picking wheel to pick up paper poorly. This not only affects the picking efficiency of the picking wheel but also reduces the smoothness of paper transport. Utility Model Content

[0003] This application discloses an automatic paper feeding device that can avoid the problem of poor paper feeding caused by excessive pressure on the paper feeding roller when there is a lot of paper. Whether it is thin printing paper or thick paper jam, it can complete the paper feeding and transmission normally and efficiently, which significantly expands the application scenarios and scope of application of the device.

[0004] To achieve the above objectives, this application discloses an automatic paper feeding device, comprising:

[0005] Upper casing;

[0006] Paper feeder, a paper transport channel is formed between the upper housing and the paper feeder;

[0007] A wheel assembly comprising a paper-taking wheel and a paper-splitting wheel arranged sequentially along the paper transport direction, wherein at least a portion of the paper-taking wheel and at least a portion of the paper-splitting wheel are located within the paper transport channel to transport the paper;

[0008] A paper pressing component is disposed on the upper housing. The paper pressing component has a first end and a second end. The first end is rotatably connected to the upper housing, and the second end can move closer to or further away from the paper picking wheel during rotation.

[0009] An elastic guide is provided on the paper feed board along the paper transport direction. The elastic guide is located on the side of the paper take-up roller away from the paper separating roller. The elastic guide is used to guide the paper to be placed between the paper pressing member and the paper take-up roller. The elastic guide is configured such that: in the initial state, the elastic guide protrudes from the upper surface of the paper feed board; when a preset pressure is applied to the elastic guide, the elastic guide can undergo elastic deformation under the action of the preset pressure and move towards the direction of the paper feed board; and when the preset pressure is removed, it returns to the initial state.

[0010] In one possible implementation, the resilient guide includes:

[0011] A rotating component is rotatably mounted on the paper feeder, and the rotation axis of the rotating component is parallel to the rotation axis of the paper take-up wheel;

[0012] A reset member is disposed between the rotating member and the paper feeder. The reset member is used to undergo elastic deformation when the rotating member rotates toward the paper feeder and to reset to the initial state when the preset pressure is removed.

[0013] In one possible implementation, the rotating element includes a rotating shaft and a movable part connected to the rotating shaft, the rotating shaft being rotatably mounted on the feed paper, and the movable part protruding from the upper surface of the feed paper;

[0014] The reset component includes a torsion spring, which includes a helical portion and a first connecting arm and a second connecting arm connected to both ends of the helical portion. The helical portion is sleeved on the rotating shaft, the first connecting arm abuts against the paper feeder, and the second connecting arm is connected to the movable portion.

[0015] In one possible implementation, the lower surface of the feed plate is provided with a mounting base, the rotating shaft is rotatably mounted on the mounting base, and the feed plate is provided with a clearance groove on the side of the mounting base near the paper-taking wheel. The clearance groove extends through the thickness direction of the feed plate, and the movable part extends out of the feed plate through the clearance groove. In the initial state, the movable part is inclined relative to the feed plate, and the end of the movable part near the paper-taking wheel is farther away from the feed plate than the end of the movable part away from the paper-taking wheel. Under the action of the preset pressure, the movable part can move toward the clearance groove.

[0016] In one possible implementation, the rotating shaft is provided with a first stop along the rotation axis direction, and the mounting base is provided with a second stop. The first stop and the second stop are engaged in a stop-locking cooperation along the rotation axis direction of the rotating shaft to restrict the movement of the rotating shaft along the rotation axis direction of the rotating shaft.

[0017] In one possible implementation, along the rotation axis of the shaft, the shaft includes a large-diameter section located in the middle of the shaft and small-diameter sections located at both ends of the shaft. The shoulders formed by the large-diameter section and the small-diameter section constitute the first stop portion. The mounting base includes two mounting grooves corresponding to the two small-diameter sections. The small-diameter sections are rotatably assembled in the mounting grooves. The surfaces of the mounting grooves opposite to the shoulders constitute the second stop portion.

[0018] In one possible implementation, the mounting groove includes a notch for assembling the small-diameter segment, the notch being located on the side of the mounting groove away from the paper feeder, the small-diameter segment having a first mounting plane and a second mounting plane cut radially opposite each other along the axis of rotation, the distance between the first mounting plane and the second mounting plane being less than the width of the notch, and the diameter of the small-diameter segment being greater than the width of the notch.

[0019] In one possible implementation, the automatic paper feeding device further includes a paper stop block comprising a rotating beam disposed on the mounting base near the paper pick-up wheel, the rotating beam being located on the side of the movable part away from the paper transport channel to prevent the resilient guide from disengaging from the feed plate.

[0020] In one possible implementation, the mounting base is provided with a fixing groove that extends through the side away from the paper feeder, the first connecting arm abuts against the bottom of the fixing groove, the movable part is provided with a fixing hole, and the second connecting arm is inserted into the fixing hole.

[0021] In one possible implementation, the resilient guide includes a spring sheet that is inclined relative to the feed plate, with one end of the spring sheet near the paper pick-up wheel being away from the feed plate relative to the other end of the spring sheet away from the paper pick-up wheel.

[0022] Compared with the prior art, the automatic paper feeding device of this application has the following advantages:

[0023] The automatic paper feeding device of this application forms a paper transport channel between its upper housing and the paper feeder, providing a path and space for paper transport. The wheel assembly includes a paper-taking wheel and a paper-separating wheel arranged sequentially along the paper transport direction, with at least a portion of the paper-taking wheel and the paper-separating wheel located within the paper transport channel. The paper-taking wheel, through rotation, separates individual sheets of paper from the paper stack and transports them under the frictional force generated by its interaction with the paper-pressing component. The paper-separating wheel assists in the smooth forward movement of the paper, achieving an orderly transfer of paper from the paper stack to the transport channel and ensuring the continuity and accuracy of paper transport. The paper-pressing component is mounted on the upper housing, with its first end rotatably connected to the upper housing and its second end able to move closer to or further away from the paper-taking wheel during rotation. This allows for flexible adjustment of the pressure between the component and the paper-taking wheel to accommodate papers of different thicknesses and materials. When paper needs to be taken, the second end of the paper-pressing component moves closer to the paper-taking wheel, increasing the pressure on the paper and enhancing friction to ensure reliable separation and transport of the paper. When paper taking is not required or maintenance is needed, the second end can move away from the paper-taking wheel for easier operation and adjustment.

[0024] Furthermore, the elastic guide is mounted on the feed plate, located on the side of the paper-taking roller furthest from the separating roller. In its initial state, the elastic guide protrudes from the upper surface of the feed plate, effectively guiding the paper between the pressing component and the paper-taking roller. This provides accurate guidance for the paper to enter the paper-taking working area, reducing paper jams caused by placement deviations. When a preset pressure is applied to the elastic guide, it undergoes elastic deformation and moves towards the feed plate. When there is a large quantity of paper and a high stack height, the paper exerts pressure on the elastic guide, causing it to deform and retract, bringing the paper closer to the feed plate. This increases the contact area between the paper and the paper-taking roller, preventing the paper-taking roller from obstructing paper due to excessive pressure. When the preset pressure is removed, the elastic guide returns to its initial state, continuing its guiding function. The elastic guide's ability to adapt to paper pressure allows this automatic paper feeding device to handle paper of different thicknesses and materials. Whether it's thin printing paper or thick, jammed paper, the device can complete paper taking and conveying operations normally and efficiently, greatly expanding its application scenarios and scope. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 One of the structural schematic diagrams of an automatic paper feeding device provided in this embodiment of the present utility model;

[0027] Figure 2A second schematic diagram of an automatic paper feeding device provided for an embodiment of this utility model;

[0028] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 A third schematic diagram of an automatic paper feeding device provided for an embodiment of this utility model;

[0030] Figure 5 One of the structural schematic diagrams of the elastic guide and feed paperboard of an automatic paper feeding device provided in this embodiment of the present utility model;

[0031] Figure 6 A second schematic diagram of the structure of the elastic guide and the feed paper of an automatic paper feeding device provided in this embodiment of the present utility model;

[0032] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0033] Figure 8 A schematic diagram of the structure of an elastic guide component of an automatic paper feeding device provided in an embodiment of this utility model;

[0034] Figure 9 A schematic diagram of the feeding board of an automatic paper feeding device provided in an embodiment of this utility model;

[0035] Figure 10 for Figure 9 A magnified view of a section at point C.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10-Upper housing; 11-Paper transport channel;

[0038] 20 - Paperboard feeder; 21 - Upper surface; 22 - Lower surface; 221 - Mounting base; 2211 - Second stop; 2212 - Mounting groove; 22121 - Groove opening; 2213 - Fixing groove; 222 - Clearance groove;

[0039] 30 - Roller assembly; 31 - Paper pick-up roller; 32 - Paper separating roller;

[0040] 40 - Paper clamping element; 41 - First end; 42 - Second end;

[0041] 50 - Elastic guide; 51 - Rotating component; 511 - Rotating shaft; 5111 - First stop; 5112 - Large diameter section; 5113 - Small diameter section; 51131 - First mounting plane; 51132 - Second mounting plane; 512 - Movable part; 5121 - Fixing hole; 52 - Reset component; 521 - Torsion spring; 5211 - Helical part; 5212 - First connecting arm; 5213 - Second connecting arm;

[0042] 60 - Paper stop block; 61 - Rotating beam. Detailed Implementation

[0043] 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. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In this application, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0046] Automatic paper feeding devices utilize a wheel assembly to perform paper picking and separating functions. This assembly includes a picking wheel and a separating wheel, with a pressure plate above the picking wheel. During operation, the picking wheel rotates, and with the assistance of the pressure plate, friction forces the paper in contact with the picking wheel in the paper stack towards the separating wheel. The separating wheel then assists in the smooth forward movement of the paper. A paper transport channel is formed between the upper housing of the automatic paper feeding device and the feed board. The picking wheel is typically higher than the feed board and located within this channel. In existing technology, a guide is usually placed at the front end of the picking wheel to guide the paper between the picking wheel and the pressure plate. However, when the quantity of paper is large, this increases the pressure between the paper and the picking wheel, causing the picking wheel to pick up paper poorly. This not only affects the picking efficiency of the picking wheel but also reduces the smoothness of paper transport.

[0047] In view of this, some embodiments of this application provide an automatic paper feeding device. By providing an elastic guide on the side of the paper feeding roller away from the paper separating roller, the device can avoid the problem of poor paper feeding caused by excessive pressure on the paper feeding roller when there is a lot of paper. Whether it is thin printing paper or thick paper jam, the paper feeding and transmission can be completed normally and efficiently, which significantly expands the application scenarios and scope of application of the device.

[0048] The present application will be described in detail below through specific embodiments:

[0049] The automatic paper feeding device in the embodiments of this application, such as Figures 1-10 As shown, an automatic paper feeding device includes:

[0050] Upper shell 10;

[0051] Paper conveying channel 11 is formed between the upper housing 10 and the paper conveying board 20;

[0052] The wheel assembly 30 includes a paper-taking wheel 31 and a paper-splitting wheel 32 arranged sequentially along the paper transport direction. At least a portion of the paper-taking wheel 31 and at least a portion of the paper-splitting wheel 32 are located within the paper transport channel 11 to transport paper.

[0053] Paper pressing component 40 is disposed on the upper housing 10. The paper pressing component 40 has a first end 41 and a second end 42. The first end 41 is rotatably connected to the upper housing 10, and the second end 42 can move closer to or away from the paper picking wheel 31 during rotation.

[0054] An elastic guide 50 is disposed on the paper feeder 20 along the paper transport direction. The elastic guide 50 is located on the side of the paper take-up roller 31 away from the paper separating roller 32. The elastic guide 50 is used to guide the paper to be placed between the paper presser 40 and the paper take-up roller 31. The elastic guide 50 is configured such that: in the initial state, the elastic guide 50 protrudes from the upper surface 21 of the paper feeder 20; when a preset pressure is applied to the elastic guide 50, the elastic guide 50 can undergo elastic deformation under the action of the preset pressure and move towards the paper feeder 20; and when the preset pressure is removed, it returns to the initial state.

[0055] The automatic paper feeding device provided in this application embodiment forms a paper transport channel 11 between the upper housing 10 and the paper feed board 20, providing a path and space for paper transport. The wheel assembly 30 includes a paper-taking wheel 31 and a paper-separating wheel 32 arranged sequentially along the paper transport direction, with at least a portion of the paper-taking wheel 31 and the paper-separating wheel 32 located within the paper transport channel 11. The paper-taking wheel 31, through rotation, separates individual sheets of paper from the paper stack and transports them under the frictional force generated by its interaction with the paper-pressing component 40. The paper-separating wheel 32 assists in the smooth forward movement of the paper, realizing the orderly transfer of paper from the paper stack to the transport channel and ensuring the continuity and accuracy of paper transport. The paper-pressing component 40 is disposed on the upper housing 10, with its first end 41 rotatably connected to the upper housing 10, and its second end 42 able to move closer to or further away from the paper-taking wheel 31 during rotation, flexibly adjusting the pressure between it and the paper-taking wheel 31 to adapt to papers of different thicknesses and materials. When paper needs to be picked up, the second end 42 of the paper pressing component 40 is close to the paper picking wheel 31 to increase the pressure on the paper and enhance the friction, ensuring that the paper can be reliably separated and transported; when paper picking is not required or maintenance is required, the second end 42 can be moved away from the paper picking wheel 31 for easy operation and adjustment.

[0056] Furthermore, the elastic guide 50 is disposed on the feed plate 20, located on the side of the paper take-up roller 31 away from the paper separating roller 32. In the initial state, the elastic guide 50 protrudes from the upper surface 21 of the feed plate 20, effectively guiding the paper to be placed between the paper pressing member 40 and the paper take-up roller 31, providing accurate guidance for the paper to enter the paper take-up working area, and reducing problems such as paper jams caused by paper placement deviation. When a preset pressure is applied to the elastic guide 50, it can undergo elastic deformation and move towards the feed plate 20. When there are many sheets of paper and the stacking height is high, the paper exerts pressure on the elastic guide 50, causing the elastic guide 50 to deform and retract, making the paper at the elastic guide 50 move closer to the feed plate 20, thereby increasing the contact area between the paper and the paper take-up roller 31, thus avoiding the paper take-up roller 31 from being unable to pick up paper smoothly due to excessive paper pressure. When the preset pressure is removed, the elastic guide 50 can return to its initial state and continue to play a guiding role. The elastic guide 50 can elastically deform to adapt to paper pressure, enabling the automatic paper feeding device to adapt to paper of different thicknesses and materials. Whether it is thin printing paper or thick jammed paper, the device can complete the paper picking and transmission work normally and efficiently, greatly expanding the application scenarios and scope of the device.

[0057] It should be explained that when conveying a single sheet of paper or a small number of sheets, because the paper is relatively soft, it needs to be guided by a guide to ensure it accurately enters between the paper pressing component 40 and the paper picking roller 31. The elastic guide 50 of this application does not deform under low pressure, thus providing a good guiding effect. However, when conveying multiple sheets of paper, because the paper is relatively thick, it can be manually guided between the paper pressing component 40 and the paper picking roller 31. If a fixed guide is used, the paper will be lifted at the guide. Since multiple sheets of paper are acting on the paper picking roller 31, the pressure between the paper and the paper picking roller 31 will be too high, which may cause the paper picking roller 31 to pick up the paper smoothly. When using the elastic guide 50 of this application, when there are many sheets of paper, the elastic guide 50 is retracted under pressure, causing the paper to move closer to the paper feeding board 20 at the guide, thereby increasing the contact area between the bottom sheet and the paper picking roller 31, increasing the pressure of the paper on the paper picking roller 31, and facilitating smooth paper picking.

[0058] In the diagram, the X direction represents the paper transport direction.

[0059] In one possible implementation, such as Figures 1 to 6 As shown, the elastic guide 50 includes a rotating member 51, which is rotatably mounted on the paper feeder 20. The rotation axis of the rotating member 51 is parallel to the rotation axis of the paper picker 31.

[0060] The elastic guide 50 also includes a reset member 52, which is located between the rotating member 51 and the paper feeder 20. The reset member 52 is used to undergo elastic deformation when the rotating member 51 rotates toward the paper feeder 20, and reset to the initial state when the preset pressure is removed.

[0061] The rotation axis of the rotating component 51 is parallel to the rotation axis of the paper-taking wheel 31, ensuring that the rotating component 51 can make stable angle adjustments along the transverse direction of paper transport during rotation, thereby providing precise guidance for the paper. The reset component 52 is disposed between the rotating component 51 and the paper feed board 20. When the rotating component 51 is subjected to paper pressure and rotates towards the paper feed board 20, the reset component 52 undergoes elastic deformation, converting the external force into elastic potential energy and storing it. When the paper passes through and the preset pressure is removed, the reset component 52, with its own elastic restoring force, quickly releases the stored elastic potential energy, pushing the rotating component 51 back to its initial state, preparing for the next paper transport, thus realizing the dynamic balance and precise control of the elastic guide component 50 during the paper transport process.

[0062] In some embodiments, such as Figure 3 , Figure 5 and Figure 6As shown, the rotating component 51 includes a rotating shaft 511 and a movable part 512 connected to the rotating shaft 511. The rotating shaft 511 is rotatably mounted on the paper feeder 20, and the movable part 512 protrudes from the upper surface 21 of the paper feeder 20.

[0063] The reset component 52 includes a torsion spring 521. The torsion spring 521 includes a spiral portion 5211 and a first connecting arm 5212 and a second connecting arm 5213 connected to both ends of the spiral portion 5211. The spiral portion 5211 is sleeved on the rotating shaft 511. The first connecting arm 5212 abuts against the paper feeder 20, and the second connecting arm 5213 is connected to the movable portion 512.

[0064] The rotating component 51 includes a rotating shaft 511 and a movable part 512. The rotating shaft 511 is rotatably mounted on the feed paper 20, and the movable part 512 protrudes from the upper surface 21 of the feed paper 20. The resetting component 52 is a torsion spring 521. The helical part 5211 of the torsion spring 521 is sleeved on the rotating shaft 511. The first connecting arm 5212 of the torsion spring 521 abuts against the feed paper 20, and the second connecting arm 5213 is connected to the movable part 512, forming a stable force transmission structure. During paper feeding, the paper first contacts the movable part 512. When the paper is thin, the pressure on the movable part 512 is small, and the torsion spring 521 only undergoes slight deformation, maintaining a stable guiding posture. However, when the paper is thick, the movable part 512 drives the rotating shaft 511 to rotate under pressure. At this time, the helical part 5211 of the torsion spring 521 twists further, storing more elastic potential energy. After the paper passes through, the torsion spring 521 releases its elastic potential energy, causing the movable part 512 to quickly return to its original position via the second connecting arm 5213 and the rotating shaft 511. Throughout the process, the torque output of the torsion spring 521 and the rotation angle of the movable part 512 are dynamically balanced, ensuring that the movable part 512 can automatically adjust its position according to the paper thickness, and quickly return to its initial state after the pressure is removed, preparing for the next paper feed.

[0065] In other embodiments, the reset member 52 may also include a V-shaped spring, one end of which abuts against the movable part 512 and the other end of which abuts against the feed plate 20.

[0066] Furthermore, in some embodiments, such as Figure 6 and Figure 7As shown, the lower surface 22 of the feed plate 20 is provided with a mounting base 221, and the rotating shaft 511 is rotatably mounted on the mounting base 221. The feed plate 20 is provided with a relief groove 222 on the side of the mounting base 221 near the paper picking wheel 31. The relief groove 222 extends through the thickness direction of the feed plate 20. The movable part 512 extends out of the feed plate 20 through the relief groove 222. In the initial state, the movable part 512 is inclined relative to the feed plate 20. The end of the movable part 512 near the paper picking wheel 31 is away from the feed plate 20 relative to the end of the movable part 512 away from the paper picking wheel 31. Under the action of a preset pressure, the movable part 512 can move toward the relief groove 222.

[0067] The mounting base 221 provided on the lower surface 22 of the feed paperboard 20 provides a stable base for the rotating shaft 511. On the one hand, this makes the connection between the rotating shaft 511 and the feed paperboard 20 more secure, ensuring that the rotating component 51 will not easily shake or shift during operation, thereby maintaining the overall stability of the elastic guide component 50. On the other hand, by hiding the rotating shaft 511 under the feed paperboard 20, it avoids interfering with the paper transport path, allowing the paper to pass smoothly through the upper surface 21 of the feed paperboard 20 without being obstructed by the rotating shaft 511 or other components, thus ensuring the continuity of paper transport.

[0068] The feed plate 20 has a clearance groove 222 on the side of the mounting base 221 near the paper take-up roller 31, which extends through the thickness direction. The movable part 512 extends out of the feed plate 20 from the clearance groove 222. In the initial state, the movable part 512 can be tilted relative to the feed plate 20, and the end near the paper take-up roller 31 is away from the feed plate 20. When the paper applies a preset pressure to the movable part 512, the movable part 512 can move towards the clearance groove 222. The existence of the clearance groove 222 ensures that the movable part 512 is not obstructed by the body of the feed plate 20 when it is deformed under force, ensuring that the movable part 512 can flexibly undergo elastic deformation, effectively absorb the paper pressure, realize the adaptation of the elastic guide 50 to different paper stacking pressures, and also provide movement space for the movable part 512 to reset.

[0069] Of course, in other embodiments, when the paperboard 20 is thicker, a groove can be provided on the upper surface 21 of the paperboard 20, and a mounting seat 221 for mounting the rotating shaft 511 can be provided.

[0070] In this embodiment, as Figure 6 and Figure 7 As shown, along the rotation axis of the rotating shaft 511, the rotating shaft 511 is provided with a first stop 5111, and the mounting base 221 is provided with a second stop 2211. The first stop 5111 and the second stop 2211 are in a stop-fitting engagement along the rotation axis of the rotating shaft 511 to restrict the movement of the rotating shaft 511 along the rotation axis of the rotating shaft 511.

[0071] Thus, by providing stop components on the rotating shaft 511 and the mounting base 221 respectively, the movement of the rotating shaft 511 is restricted. When the rotating shaft 511 is subjected to an external force along its rotation axis and attempts to move axially, the first stop 5111 will contact and abut against the second stop 2211. Through the stop cooperation of the two, the external force is canceled out, thereby preventing the rotating shaft 511 from displacing in that direction. This precisely limits the range of motion of the rotating shaft 511, ensuring that it can only rotate around its own rotation axis. This avoids problems such as the shaking of the rotating part 51 and the positional displacement of the moving part 512 caused by the axial movement of the rotating shaft 511, and ensures the accuracy and reliability of the moving part 512 in the process of guiding the paper.

[0072] In one possible implementation, such as Figure 7 and Figure 8 As shown, along the rotation axis of the rotating shaft 511, the rotating shaft 511 includes a large-diameter section 5112 located in the middle of the rotating shaft 511 and small-diameter sections 5113 located at both ends of the rotating shaft 511. The shoulders formed by the large-diameter section 5112 and the small-diameter section 5113 constitute the first stop portion 5111. The mounting base 221 includes two mounting grooves 2212 corresponding to the two small-diameter sections 5113. The small-diameter sections 5113 are rotatably assembled in the mounting grooves 2212. The surfaces of the mounting grooves 2212 opposite to the shoulders constitute the second stop portion 2211.

[0073] Thus, along the rotation axis of the rotating shaft 511, the rotating shaft 511 adopts a stepped shaft design, including a large-diameter section 5112 in the middle and small-diameter sections 5113 at both ends. The shoulder formed by the large-diameter section 5112 and the small-diameter section 5113 constitutes the first stop part 5111. The mounting base 221 is provided with two mounting grooves 2212. The small-diameter section 5113 is rotatably assembled in the groove. The surface of the mounting groove 2212 opposite to the shoulder constitutes the second stop part 2211. This kind of cooperation between the stepped shaft and the mounting groove 2212 achieves bidirectional constraint on the rotating shaft 511 through the axial limitation of the shoulder and the groove surface. When the rotating shaft 511 is subjected to axial force, the shoulder and the surface of the mounting groove 2212 make surface contact to stop, so that the movement of the rotating shaft 511 in both directions is restricted, forming a stable axial positioning.

[0074] In other possible implementations, a stop protrusion may be provided on the pivot 511 to create a limit between it and the side wall of the mounting groove 2212.

[0075] In some embodiments, such as Figure 8 , Figure 9 and Figure 10As shown, the mounting groove 2212 includes a slot 22121 for assembling the small-diameter section 5113. The slot 22121 is located on the side of the mounting groove 2212 away from the paper feeder 20. The small-diameter section 5113 has a first mounting plane 51131 and a second mounting plane 51132 cut radially relative to each other along the rotating shaft 511. The distance between the first mounting plane 51131 and the second mounting plane 51132 is less than the width of the slot 22121, and the diameter of the small-diameter section 5113 is greater than the width of the slot 22121.

[0076] Thus, since the distance between the first mounting plane 51131 and the second mounting plane 51132 is less than the width of the slot 22121, when the shaft 511 is installed, the first mounting plane 51131 and the second mounting plane 51132 of the small-diameter section 5113 are aligned with the wall of the slot 22121, allowing the small-diameter section 5113 to smoothly pass through the slot 22121 and enter the mounting groove 2212, thereby assembling the shaft 511 into the mounting groove 2212. After the shaft 511 is assembled into the mounting groove 2212, the shaft 511 is rotated so that one of the mounting planes faces the slot 22121. Since the diameter of the small-diameter section 5113 is greater than the width of the slot 22121, the slot 22121 can restrict the shaft 511 from coming out of the slot 22121, improving the stability of the shaft 511 installation and making the assembly process of the shaft 511 more convenient.

[0077] In some other embodiments, the mounting groove 2212 may be configured as a resilient C-shaped retaining ring, into which the rotating shaft 511 is inserted, thereby eliminating the need for a mounting surface on the rotating shaft 511 for easy assembly.

[0078] In one possible implementation, such as Figure 6 and Figure 7 As shown, the automatic paper feeding device also includes a paper stop block 60, which includes a rotating beam 61 located on the side of the mounting base 221 near the paper pick-up wheel 31. The rotating beam 61 is located on the side of the movable part 512 away from the paper transport channel 11 to prevent the elastic guide 50 from disengaging from the feed board 20.

[0079] The paper stop block 60 is equipped with a rotating beam 61, which is located on the side of the mounting base 221 near the paper pick-up wheel 31 and on the side of the movable part 512 away from the paper transport channel 11. This allows the rotating beam 61 to effectively limit the elastic guide 50, effectively preventing the elastic guide 50 from detaching from the paper feed board 20. This ensures that the elastic guide 50 is always in the correct position, guarantees the normal function of guiding the paper, avoids paper transport failures caused by the detachment of the elastic guide 50, and improves the stability and reliability of the device.

[0080] In one possible implementation, such as Figure 3 and Figure 4 As shown, the mounting base 221 is provided with a fixing groove 2213, which is provided through the side of the fixing groove 2213 away from the paper feeder 20. The first connecting arm 5212 abuts against the bottom of the fixing groove 2213. The movable part 512 is provided with a fixing hole 5121, and the second connecting arm 5213 is inserted into the fixing hole 5121.

[0081] The fixing groove 2213 is designed to pass through the side away from the paper feeder 20. This design facilitates the assembly of the torsion spring 521, allowing it to be inserted directly from above the groove opening 22121, simplifying the assembly process and reducing assembly difficulty. The first connecting arm 5212 of the torsion spring 521 abuts against the bottom of the fixing groove 2213. The constraint of the groove bottom fixes one end of the torsion spring 521, ensuring that the torsion spring 521 does not shift under force while allowing it to freely expand and contract within its elastic range, ensuring effective transmission of elastic force. The fixing hole 5121 on the movable part 512 and the second connecting arm 5213 of the torsion spring 521 form an insertion fit, allowing the torsion spring 521 to directly apply elastic force to the movable part 512, driving it to reset after being subjected to force. This also prevents the second connecting arm 5213 from detaching from the movable part 512 during operation, ensuring a reliable connection between the torsion spring 521 and the movable part 512.

[0082] In another possible implementation, the elastic guide 50 includes a spring that is inclined relative to the paper feed plate 20, with one end of the spring near the paper pick-up roller 31 being away from the paper feed plate 20 relative to the other end of the spring away from the paper pick-up roller 31.

[0083] The spring sheet, acting as an elastic guide 50, is inclined relative to the feed plate 20, giving it a specific angle on the feed plate 20. The end of the spring sheet near the paper pick-up roller 31 is away from the feed plate 20, forming an inclined guide surface. This makes it easier for the paper to slide along the inclined surface of the spring sheet when it is placed on the feed plate 20, between the paper pick-up roller 31 and the paper pressing member 40. This reduces the difficulty of paper placement and further improves the accuracy of paper guidance.

[0084] Meanwhile, the elastic properties of the spring allow it to undergo elastic deformation when subjected to paper pressure. When there are many sheets of paper, the spring moves towards the feed plate 20 under pressure, causing the paper at the spring position to move closer to the feed plate 20, thereby increasing the contact area between the bottom sheet and the paper-taking wheel 31, increasing the pressure of the paper on the paper-taking wheel 31, and facilitating smooth paper taking.

[0085] Moreover, the spring sheet, as an elastic guide component 50, has a relatively simple structure, low manufacturing and installation costs, and is easy to assemble and maintain. At the same time, the spring sheet occupies little space, optimizing the spatial layout of the device, making the device structure more compact, and improving space utilization.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An automatic document feeder, characterized by comprising: include: Upper shell (10); Paper feeder (20), a paper transport channel (11) is formed between the upper housing (10) and the paper feeder (20); A wheel assembly (30) includes a paper-taking wheel (31) and a paper-splitting wheel (32) arranged sequentially along the paper transport direction. At least a portion of the paper-taking wheel (31) and at least a portion of the paper-splitting wheel (32) are located within the paper transport channel (11) to transport the paper. Paper pressing component (40) is disposed on the upper housing (10). The paper pressing component (40) has a first end (41) and a second end (42). The first end (41) is rotatably connected to the upper housing (10), and the second end (42) can move closer to or further away from the paper picking wheel (31) during rotation. An elastic guide (50) is disposed on the paper feed board (20) along the paper transport direction. The elastic guide (50) is disposed on the side of the paper take-up roller (31) away from the paper separating roller (32). The elastic guide (50) is used to guide the paper to be placed between the paper presser (40) and the paper take-up roller (31). The elastic guide (50) is configured such that: in the initial state, the elastic guide (50) protrudes from the upper surface (21) of the paper feed board (20); when a preset pressure is applied to the elastic guide (50), the elastic guide (50) can undergo elastic deformation under the action of the preset pressure and move toward the paper feed board (20); and when the preset pressure is removed, it returns to the initial state.

2. The automatic paper feeding device according to claim 1, characterized by The elastic guide (50) includes: Rotating component (51), which is rotatably mounted on the paper feeder (20), and the rotation axis of the rotating component (51) is parallel to the rotation axis of the paper take-up wheel (31); A reset member (52) is disposed between the rotating member (51) and the paper feeder (20). The reset member (52) is used to undergo elastic deformation when the rotating member (51) rotates toward the paper feeder (20) and reset to the initial state when the preset pressure is removed.

3. The automatic document feeder according to claim 2, wherein The rotating component (51) includes a rotating shaft (511) and a movable part (512) connected to the rotating shaft (511). The rotating shaft (511) is rotatably mounted on the feed paperboard (20), and the movable part (512) protrudes from the upper surface (21) of the feed paperboard (20). The reset component (52) includes a torsion spring (521), which includes a helical portion (5211) and a first connecting arm (5212) and a second connecting arm (5213) connected to both ends of the helical portion (5211). The helical portion (5211) is sleeved on the rotating shaft (511). The first connecting arm (5212) abuts against the paper feeder (20), and the second connecting arm (5213) is connected to the movable portion (512).

4. The automatic document feeder according to claim 3, wherein The lower surface (22) of the feed plate (20) is provided with a mounting base (221). The rotating shaft (511) is rotatably mounted on the mounting base (221). The feed plate (20) is provided with a relief groove (222) on the side of the mounting base (221) near the paper picking wheel (31). The relief groove (222) extends through the thickness direction of the feed plate (20). The movable part (512) extends out of the feed plate (20) through the relief groove (222). In the initial state, the movable part (512) is inclined relative to the feed plate (20). The end of the movable part (512) near the paper picking wheel (31) is away from the feed plate (20) relative to the end of the movable part (512) away from the paper picking wheel (31). Under the action of the preset pressure, the movable part (512) can move toward the relief groove (222).

5. The automatic paper feeding device according to claim 4, characterized in that, Along the rotation axis of the rotating shaft (511), the rotating shaft (511) is provided with a first stop (5111), and the mounting base (221) is provided with a second stop (2211). The first stop (5111) and the second stop (2211) are engaged in a stop-and-stop cooperation along the rotation axis of the rotating shaft (511) to restrict the movement of the rotating shaft (511) along the rotation axis of the rotating shaft (511).

6. The automatic paper feeding device according to claim 5, characterized in that, Along the rotation axis of the shaft (511), the shaft (511) includes a large-diameter section (5112) located in the middle of the shaft (511) and small-diameter sections (5113) located at both ends of the shaft (511). The shoulders formed by the large-diameter section (5112) and the small-diameter section (5113) constitute the first stop portion (5111). The mounting base (221) includes two mounting grooves (2212) corresponding to the two small-diameter sections (5113). The small-diameter sections (5113) are rotatably assembled in the mounting grooves (2212). The surfaces of the mounting grooves (2212) opposite to the shoulders constitute the second stop portion (2211).

7. The automatic paper feeding device according to claim 6, characterized in that, The mounting groove (2212) includes a notch (22121) for assembling the small-diameter section (5113), the notch (22121) being located on the side of the mounting groove (2212) away from the paper feeder (20), the small-diameter section (5113) having a first mounting plane (51131) and a second mounting plane (51132) cut radially opposite to each other along the rotating shaft (511), the distance between the first mounting plane (51131) and the first mounting plane (51131) being less than the width of the notch (22121), and the diameter of the small-diameter section (5113) being greater than the width of the notch (22121).

8. The automatic paper feeding device according to claim 4, characterized in that, The automatic paper feeding device further includes a paper stop block (60), which includes a rotating beam (61) disposed on the mounting base (221) near the paper pick-up wheel (31). The rotating beam (61) is located on the side of the movable part (512) away from the paper transport channel (11) to prevent the elastic guide (50) from disengaging from the feed board (20).

9. The automatic paper feeding device according to claim 4, characterized in that, The mounting base (221) is provided with a fixing groove (2213), which is provided through the side away from the paper feeder (20). The first connecting arm (5212) abuts against the bottom of the fixing groove (2213). The movable part (512) is provided with a fixing hole (5121), and the second connecting arm (5213) is inserted into the fixing hole (5121).

10. The automatic paper feeding device according to claim 1, characterized in that, The elastic guide (50) includes a spring sheet, which is inclined relative to the feed plate (20), and the end of the spring sheet near the paper pick-up wheel (31) is away from the feed plate (20) relative to the end of the spring sheet away from the paper pick-up wheel (31).

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