A paper separation mechanism of scanner and its implementation method

Abstract

The present invention belongs to the technical field of scanners, and in particular to a scanner paper separation mechanism and an implementation method thereof, the mechanism comprising a paper separation shaft and a paper pickup shaft arranged in parallel; and also comprising an elastic member providing a force for the paper separation shaft to move toward the paper pickup shaft; also comprising a paper pickup wheel and a paper separation wheel respectively arranged on the paper pickup shaft and the paper separation shaft, the paper pickup wheel and the paper separation wheel being arranged radially opposite to each other; also comprising an adjustable damping shaft assembly driving the paper separation shaft to rotate differentially relative to the paper pickup shaft; also comprising a gear assembly arranged on the paper pickup shaft, and a transmission assembly for transmission connection between the gear assembly and the adjustable damping shaft assembly; wherein the adjustable damping shaft assembly realizes transmission and separation through the transmission assembly and the gear assembly, and when the transmission is engaged, paper is separated by the reverse rotation of the paper separation wheel, so that the friction positions of the paper separation wheel and the paper pickup wheel are evenly distributed circumferentially, thereby avoiding the problem of a single friction point leading to a short service life of the paper separation sheet and the paper pickup wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of scanners, and in particular to a scanner paper separation mechanism and an implementation method thereof. Background Art

[0002] Scanners are usually used as computer external instruments and equipment, which capture images and convert them into digital input devices that can be displayed, edited, stored and output by computers. Scanners can scan photos, text pages, drawings, art drawings, photographic negatives, film films, and even three-dimensional objects such as textiles, sign panels, and printed circuit board samples, extracting and converting original lines, graphics, text, photos, and flat objects into devices that can be edited and added to files.

[0003] At present, the paper feeding mechanism of the traditional scanner is to transfer the paper from the paper feeding port of the scanner to the scanner through the pickup roller assembly. The upper part of the traditional pickup roller assembly is the paper picking and paper separation roller, and the lower part is the paper separation sheet support assembly and the spring pressure application component. When multiple sheets of paper are fed, the friction between the upper roller and the lower paper separation sheet is used to prevent multiple sheets of paper from being fed, thereby realizing the paper separation operation of a single sheet of paper. However, this traditional structure causes the paper separation sheet to be rubbed by the roller and paper at the same position, resulting in easy wear of the paper separation sheet, with a lifespan of only 30,000 paper feeding times and a failure probability of 1 / 1000, which can no longer meet the growing market demand. Therefore, it is necessary to propose a new scanner paper separation mechanism. Summary of the invention

[0004] The object of the present invention is to provide a scanner paper separation mechanism to solve the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a scanner paper separation mechanism, comprising a paper separation shaft and a paper pickup shaft arranged in parallel; and

[0006] It also includes an elastic member that provides a force for the paper separation shaft to move toward the paper pickup shaft;

[0007] It also includes a paper picking wheel and a paper separating wheel respectively arranged on the paper picking shaft and the paper separating shaft, and the paper picking wheel and the paper separating wheel are arranged radially opposite to each other;

[0008] It also includes an adjustable damping shaft assembly coaxially connected to the paper separation shaft;

[0009] It also includes a gear assembly arranged on the paper pickup shaft, and a transmission assembly that transmission-connects the gear assembly and the adjustable damping shaft assembly;

[0010] Among them, the adjustable damping shaft assembly realizes transmission and separation through the transmission assembly and the gear assembly; when the transmission is engaged, the paper separation shaft has two states of reverse rotation and forward rotation, the reverse rotation state corresponds to the paper feeding process, and the forward rotation state corresponds to the no-load process.

[0011] The scanner paper separation mechanism described in the present invention, wherein the adjustable damping shaft assembly includes a shaft body coaxially rotatably connected to the paper separation shaft, a magnetic drive wheel coaxially arranged on the shaft body, and a movable sleeve coaxially slidably connected to the paper separation shaft; the magnetic drive wheel is provided with an extended magnetic pole extending into the movable sleeve, the inner wall of the movable sleeve is provided with a magnet that can attract the extended magnetic pole, and the magnet and the extended magnetic pole are both provided in plurality and are evenly arranged around the shaft body.

[0012] In the scanner paper separation mechanism of the present invention, the magnet is located on a side of the extended magnetic pole away from the rotating shaft body, and when assembled in place, the extended magnetic pole fits with the magnet.

[0013] The scanner paper separation mechanism described in the present invention is characterized in that an inner sleeve connected to the paper separation wheel is coaxially provided on the paper separation shaft along its length direction, an inner spline sleeve is coaxially provided on the outer side wall of the inner sleeve at one end away from the paper separation wheel, and an outer spline sleeve adapted to the inner cavity of the inner spline sleeve is coaxially provided on the movable sleeve.

[0014] The paper separation mechanism of the scanner of the present invention, wherein the magnetic driving wheel comprises a first annular magnetic wheel which is magnetized radially; an annular protrusion is coaxially arranged on the circumferential side wall of the first annular magnetic wheel; a plurality of first notch grooves are evenly distributed circumferentially on the annular protrusion;

[0015] The transmission assembly includes a second annular magnetic wheel which is radially magnetized and synchronously driven by the gear assembly; an annular groove adapted to the annular protrusion is coaxially arranged on the circumferential side wall of the second annular magnetic wheel, and a plurality of second notch grooves are evenly distributed circumferentially on two opposite side walls of the annular groove; a Hall distance sensor element for detecting the radial distance between the annular protrusion and the inner wall of the annular groove is arranged on the inner wall of the annular groove; the inner and outer magnetic poles of the first annular magnetic wheel and the second annular magnetic wheel are the same.

[0016] The scanner paper separation mechanism described in the present invention, wherein the magnetic drive wheel also includes a protective sleeve covering the outer side wall of the first annular magnetic wheel, and the extended magnetic pole extends out of the protective sleeve; an axial spacing adjustment groove is provided on an end surface of the protective sleeve facing the movable sleeve.

[0017] In the scanner paper separation mechanism of the present invention, the plurality of second notch grooves on the two opposite side walls of the annular groove are circumferentially staggered, and the axial projections of the plurality of second notch grooves form a closed annular structure.

[0018] The scanner paper separation mechanism described in the present invention, wherein the transmission assembly also includes a transmission hub for mounting the second annular magnetic wheel, and a transmission fixed shaft for fixing the transmission hub; the transmission fixed shaft is parallel to the paper picking shaft, and the circumferential side wall of the second annular magnetic wheel is also provided with a tooth groove meshing with the gear assembly, and the transmission hub is coaxially rotatably connected with the transmission fixed shaft.

[0019] The scanner paper separation mechanism described in the present invention, wherein the scanner paper separation mechanism also includes a paper separation mounting frame and a paper pickup mounting frame; the gap between the paper separation mounting frame and the paper pickup mounting frame forms a paper feeding channel, the paper separation shaft is located between the paper separation mounting frame and the paper pickup mounting frame, and the paper pickup shaft is arranged on the side of the paper pickup mounting frame away from the paper separation mounting frame; the transmission assembly is arranged on the paper pickup mounting frame; the paper pickup mounting frame is provided with two avoidance holes corresponding to the transmission assembly and the paper pickup wheel.

[0020] In addition, the present invention also provides a paper separation method of a scanner paper separation mechanism, the method comprising:

[0021] In the no-load process, the paper separation wheel and the paper pickup wheel keep synchronous rolling contact through the elastic force provided by the elastic member, and the transmission between the adjustable damping shaft assembly and the paper separation shaft fails;

[0022] During the paper feeding process, paper enters between the paper separation wheel and the paper pickup wheel, and the paper separation shaft realizes transmission recovery with the paper pickup shaft through the cooperation of the adjustable damping shaft assembly and the transmission assembly;

[0023] During the paper feeding process, the paper separation wheel rotates in the opposite direction relative to the paper pickup wheel to achieve a reverse paper kicking and paper separation operation.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the traditional paper separating piece is replaced by a wheel structure, and when the paper separating wheel and the paper picking wheel are closed for paper separating, the paper separating wheel can generate relative rotational motion with the paper picking wheel each time paper separating is performed, thereby making the friction position of the paper on the paper separating wheel and the paper picking wheel evenly distributed circumferentially, avoiding the problem of short service life of the paper separating piece and the paper picking wheel due to a single fixed friction position point, and through double-sided friction paper separation of the paper separating wheel and the paper picking wheel, the paper separation failure rate can be further improved, the paper separation life is longer, and the paper separation accuracy and replacement and maintenance life of the scanner are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a front view of the overall structure of the paper separation mechanism of the scanner of the present invention.

[0027] Figure 2 It is a side view of the overall structure of the paper separation mechanism of the scanner of the present invention.

[0028] Figure 3 for Figure 2 AA section view.

[0029] Figure 4 for Figure 3 A magnified view of the local structure.

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0031] Figure 6 for Figure 4 Isolated image of the first annular magnetic wheel.

[0032] Figure 7 It is an axial orthographic projection diagram of the first annular magnetic wheel of the paper separation mechanism of the scanner of the present invention.

[0033] Figure 8 It is an axial orthographic projection diagram of the second annular magnetic wheel of the paper separation mechanism of the scanner of the present invention. DETAILED DESCRIPTION

[0034] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0037] Moreover, the terms "up, down, left, right, upper end, lower end, longitudinal" and the like indicating directions are all based on the posture and position of the device or equipment described in this solution during normal use.

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0039] This embodiment discloses Figures 1 to 8 The scanner paper separation mechanism shown is applied to the scanner to provide the paper feeding and paper separation function. The mechanism includes a paper separation shaft 10 and a paper pickup shaft 20 arranged in parallel. Specifically, the paper separation shaft 10 and the paper pickup shaft 20 are detachably arranged on the paper separation mounting frame 200 and the paper pickup mounting frame 300, respectively, so that the paper separation mounting frame 200 and the paper pickup mounting frame 300 can be separated at any time for maintenance after being assembled on the scanner; the mechanism also includes an elastic member 30 that provides a force for the paper separation shaft 10 to move toward the paper pickup shaft 20; the mechanism also includes a paper pickup wheel 40 and a paper separation wheel 50 that are respectively arranged on the paper pickup shaft 20 and the paper separation shaft 10, and the paper pickup wheel 40 and the paper separation wheel 50 are arranged radially opposite to each other, that is, the circumferential side walls of the paper separation wheel 50 and the paper pickup wheel 40 are attached together, and the paper separation wheel 50 can press the paper on the paper pickup wheel 40 as the number of papers decreases during the paper separation process through the cooperation of the elastic member 30, so as to prevent the paper from entering the scanner abnormally;

[0040] Further, the mechanism also includes an adjustable damping shaft assembly 60 coaxially connected to the paper separation shaft 10, a gear assembly 70 arranged on the paper pickup shaft 20, and a transmission assembly 80 that transmits and connects the gear assembly 70 and the adjustable damping shaft assembly 60, wherein the adjustable damping shaft assembly 60 realizes transmission and separation with the gear assembly 70 through the transmission assembly 80; when the adjustable damping shaft assembly 60 is in transmission engagement with the gear assembly 70, the paper separation shaft 10 has two states of reverse rotation and forward rotation, and the reverse rotation state corresponds to the paper feeding process, that is, paper passes between the paper separation wheel and the paper pickup wheel, and the paper pickup wheel cannot Drives the paper separation wheel to rotate synchronously; the positive rotation state of the paper separation shaft corresponds to the no-load process, that is, no paper passes between the paper picking wheel and the paper separation wheel. At this time, after the paper separation wheel and the paper picking wheel are attached, the friction force is greater than the rotation damping of the adjustable damping shaft assembly, so the paper separation wheel and the paper picking wheel are attached and roll synchronously; that is to say, the paper separation shaft 10 rotates in the opposite direction relative to the paper picking shaft 20 to realize the reverse paper kicking operation and avoid the situation where multiple sheets of paper pass through the paper picking wheel at the same time; the transmission assembly 80 can be mounted on the paper picking shaft 20 or the paper separation shaft 10 through a connection, and can also be arranged on the paper separation mounting frame 200 or the paper picking mounting frame 300.

[0041] Compared with the traditional method of using a paper separation piece for paper separation, the present solution replaces the traditional paper separation piece with a wheel structure. When the paper separation wheel 50 and the paper pickup wheel 40 are closed for paper separation, the paper separation wheel 50 can generate relative rotational motion with the paper pickup wheel 40 each time the paper is separated, so that the friction position of the paper on the paper separation wheel 50 and the paper pickup wheel 40 is evenly distributed circumferentially, avoiding the problem of a short service life of the paper separation piece and the paper pickup wheel 40 due to a single fixed friction position point. In addition, the paper separation failure rate can be further improved through the double-sided friction paper separation of the paper separation wheel 50 and the paper pickup wheel 40, and the paper separation life is longer, which greatly improves the accuracy of paper separation and the replacement and maintenance life of the scanner. Moreover, by setting only one motor to drive the paper pickup shaft 20 to rotate, the paper separation shaft 10 can be driven to rotate through the transmission assembly 80 and the adjustable damping shaft assembly 60, which can take into account both the hardware cost and the normal function, and can also avoid the increase in overall volume and weight.

[0042] Furthermore, each of the paper separating wheel 50 and the paper picking wheel 40 is provided with two stripes for increasing friction on their circumferential side walls. The stripes on the paper separating wheel 50 are coaxially arranged with the paper picking wheel and are axially distributed in multiple stripes, and the stripes on the paper picking wheel 40 are axially arranged and circumferentially evenly distributed. In order to facilitate replacement and processing and production, the paper separating wheel 50 and the paper picking wheel 40 both include a fixed hub 1a and a soft rubber jacket 1b sleeved on the outer circumferential side wall of the fixed hub 1a, and the stripes are arranged on the soft rubber jacket 1b, and the fixed hub 1a of the paper separating wheel 50 is fixed on the paper separating shaft 10, and the fixed hub 1a of the paper picking wheel 40 is fixed on the paper picking shaft 20.

[0043] In this embodiment, the adjustable damping shaft assembly 60 includes a shaft body 61 coaxially connected to the paper separation shaft 10, a magnetic driving wheel 62 coaxially arranged on the shaft body 61, and a movable sleeve 63 coaxially connected to the paper separation shaft 10 for axial sliding; a movable groove 11 coaxially adapted to the shaft body 61 is arranged on the end surface of the paper separation shaft 10, and after assembly, the shaft body 61 extends into the movable groove 11 and keeps coaxial rotation with the paper separation shaft 10; an extended magnetic pole 620 extending into the movable sleeve 63 is arranged on the magnetic driving wheel 62, and an adjustable damping shaft assembly 60 includes a magnetic driving wheel 62 coaxially connected to the paper separation shaft 10 for axial sliding; a movable groove 11 coaxially adapted to the shaft body 61 is arranged on the end surface of the paper separation shaft 10, and after assembly, the shaft body 61 extends into the movable groove 11 and keeps coaxial rotation with the paper separation shaft 10; an extended magnetic pole 620 extending into the movable sleeve 63 is arranged on the inner wall of the movable sleeve 63 The magnet 90 attracted to the extended magnetic pole 620, both the magnet 90 and the extended magnetic pole 620 are provided in plurality and are evenly arranged around the rotating shaft body 61, and the magnetic attraction between each magnet 90 and the extended magnetic pole 620 can enable the paper separation shaft 10 to kick out excess paper in the reverse direction when separating paper, and when there is no paper between the paper separation wheel 50 and the paper pickup wheel 40, the paper separation wheel 50 can be driven by the paper pickup wheel 40 to avoid the friction between the paper separation wheel 50 and the paper pickup wheel 40 being in the same position when the paper separation wheel 50 stops rotating due to the absence of paper, and at the same time, it is convenient to quickly disassemble or install the paper separation shaft 10.

[0044] In this embodiment, the magnet 90 is located on the side of the extended magnetic pole 620 away from the rotating shaft body 61, that is, the annular structure composed of multiple magnets 90 is located on the outside of the annular structure composed of multiple extended magnetic poles 620, so as to ensure that the rotating shaft body 61 and the paper separation shaft 10 have uniform rotational damping force in the rotation direction. When assembled in place, the extended magnetic pole 620 and the magnet 90 slide and fit; and through the mutual cooperation between the extended magnetic pole 620 and the magnet 90, after replacing the paper with different surface roughness, it is only necessary to adjust the movable sleeve 63 to move a certain position toward the paper separation wheel 50, so that the axial overlap length of the extended magnetic pole 620 and the magnet 90 is reduced, so that the paper separation wheel 50 and the paper picking wheel 40 can be rotated synchronously with the matching rotational damping force, thereby avoiding relative friction and sliding between the paper separation wheel and the paper picking wheel to cause wear.

[0045] In this embodiment, an inner sleeve 100 connected to the paper separation wheel 50 is coaxially provided on the paper separation shaft 10 along its length direction, an inner spline sleeve 101 is coaxially provided on the outer side wall of the end of the inner sleeve 100 away from the paper separation wheel 50, and an outer spline sleeve 631 adapted to the inner cavity 1011 of the inner spline sleeve 101 is coaxially provided on the movable sleeve 63. The movable sleeve 63 can be axially slidingly connected to the paper separation shaft 10 through the inner spline sleeve 101 and the outer spline sleeve 631, and can be driven to rotate circumferentially, so that a gasket of corresponding thickness can be installed between the movable sleeve 63 and the magnetic drive wheel 62, so that the overlapping length of the magnet 90 and the extended magnetic pole 620 is reduced to adjust the damping force of the rotating shaft body 61 and the paper separation shaft 10, thereby realizing the clutch switching before and after the paper separation of the paper separation wheel 50 and the paper picking wheel 40 is completed.

[0046] In this embodiment, the magnetic drive wheel 62 includes a first annular magnetic wheel 621 that is radially magnetized; an annular protrusion 6a is coaxially provided on the circumferential side wall of the first annular magnetic wheel 621; a plurality of first notch grooves 6b are evenly distributed circumferentially on the annular protrusion 6a, so that the outer magnetic pole of the first annular magnetic wheel 621 has a plurality of radially extending extensions; specifically, the extended magnetic pole 620 is formed by axially extending from the inner magnetic pole of the first annular magnetic wheel 621, so that the magnetic properties of the annular protrusion 6a and the magnetic properties of the extended magnetic pole 620 are equal. The magnet 90 is opposite in nature, and the extended magnetic pole 620 is made into a unipolar magnet 90, so as to reduce the influence of the existence of the same-name magnetic pole on the attraction with the magnet 90. The magnet 90 is in a long strip shape and the magnetization direction is along the width direction. When assembling, the side of the magnet 90 and the extended magnetic pole 620 with different names is facing inward, and then after assembly, the magnet 90 and the extended magnetic pole 620 are attracted and attached together, and the damping connection is realized by the magnetic attraction force, so that the paper separation shaft 10 and the paper pickup shaft 20 can be rotated synchronously and the reverse full-time automatic detection and automatic switching can be realized;

[0047] Further, the transmission assembly 80 includes a second annular magnetic wheel 81 which is radially magnetized and synchronously driven by the gear assembly 70. The second annular magnetic wheel 81 is similarly formed by radial magnetization to form magnetic poles; an annular groove 8a adapted to the annular protrusion 6a is coaxially provided on the circumferential side wall of the second annular magnetic wheel 81, and a plurality of second notch grooves 8b are evenly distributed circumferentially on the two opposite side walls of the annular groove 8a, so that the outer magnetic pole of the second annular magnetic wheel 81 has a plurality of radially extending extensions on both sides of the annular groove 8a; a Hall distance sensor element 110 for detecting the radial distance between the annular protrusion 6a and the inner wall of the annular groove 8a is provided on the inner wall of the annular groove 8a. Specifically, a plurality of Hall distance sensor elements can be provided and arranged on the three inner side walls of the annular groove, and the shape thereof can also be designed to be U-shaped or L-shaped adapted to the cross-section of the annular groove;

[0048] The inner and outer magnetic poles of the first annular magnetic wheel 621 and the second annular magnetic wheel 81 are the same, so when the second annular magnetic wheel 81 rotates, the magnetic force of the extensions on both sides of its axial direction can push the upper extension of the first annular magnetic wheel 621, and compared with the gear transmission method, non-contact, noise-free and wear-free transmission is achieved; and high-precision spacing detection can be achieved through the Hall distance sensor element 110, and when multiple sheets of paper pass between the paper separation wheel 50 and the paper pickup wheel 40, the signal can be fed back to the control system in time to remind the operator to take corresponding measures.

[0049] Among them, the transmission component 80 preferably adopts a transmission gear, and of course it can also be formed by a combination of multiple gears. It only needs to ensure that when the paper picking shaft 20 rotates forward during paper separation, it can drive the paper separation shaft 10 to rotate in the opposite direction; in addition, the Hall distance sensor element 110 can also be used to detect the degree of wear of the paper separation wheel 50 and the paper picking wheel 40. It is only necessary to enter the corresponding initial sensor data of the non-wear paper separation wheel 50 and the paper picking wheel 40 when they are assembled and fitted into the control system, and then the system regularly obtains the actual tactile data of the Hall distance sensor element 110, and the degree of wear of the paper separation wheel 50 and the paper picking wheel 40 can be known by comparing the data before and after.

[0050] In this embodiment, the magnetic drive wheel 62 also includes a protective sleeve 622 covering the outer wall of the first annular magnetic wheel 621, and the annular protrusion and the extended magnetic pole 620 both extend out of the protective sleeve 622; an axial spacing adjustment groove 6c is provided on one end surface of the protective sleeve 622 facing the movable sleeve 63 to facilitate the installation of a gasket to adjust the axial position of the movable sleeve 63, and then adjust the rotational damping.

[0051] In this embodiment, the multiple second notch grooves 8b on the two opposite side walls of the annular groove 8a are arranged in a circumferentially staggered manner, and the axial projections of the multiple second notch grooves 8b form a closed annular structure, so that the driving force of the second annular magnetic wheel 81 is more continuous when driving the first annular magnetic wheel 621 to rotate, thereby ensuring the stability of the drive; further, when the extended magnetic pole 620 rotates to between two circumferentially adjacent magnets 90, the extended part of the first annular magnetic wheel 621 is located between the overlapping side walls of the two extended parts on both sides of the axial direction of the second annular magnetic wheel 81, thereby further reducing the jitter caused by the switching between the magnetic poles, so that the paper separation shaft 10 and the paper taking shaft 20 rotate more smoothly.

[0052] In this embodiment, the transmission assembly 80 also includes a transmission hub 82 for mounting the second annular magnetic wheel 81, and a transmission fixed shaft 83 for fixing the transmission hub 82; the transmission fixed shaft 83 is parallel to the paper picking shaft 20, and a tooth groove 8c meshing with the gear assembly 70 is also provided on the circumferential side wall of the second annular magnetic wheel 81, and tooth grooves 8c are provided on both sides of the axial direction of the annular groove 8a. The transmission fixed shaft 83 is fixedly installed by a mounting plate 120, and a positioning hole adapted to the paper picking shaft 20 is provided on the mounting plate 120 to facilitate the installation of the paper picking shaft 20. The transmission hub 82 is coaxially rotatably connected with the transmission fixed shaft 83. Through the mounting plate 120 and the transmission fixed shaft 83, the transmission assembly 80 and the paper picking shaft 20 can form a module that can be separated or disassembled as a whole, which is convenient and practical.

[0053] In this embodiment, the movable sleeve 63 is located on the side of the magnetic drive wheel 62 facing the paper separation wheel 50, and the end of the movable sleeve 63 facing the paper separation wheel 50 is integrally connected with the inner sleeve 100, wherein the two paper separation wheels 50 correspond to one inner sleeve 100 respectively, and the adjacent ends of the two inner sleeves 100 are axially detachably connected, and the connection method can adopt a spline shaft spline sleeve structure with interference fit, or can also be realized by a direct coaxial threaded connection structure, and the movable sleeve 63 is axially slidingly connected to the adjacent inner sleeve 100 through the inner spline sleeve. Specifically, the inner cavity length of the inner spline sleeve 101 is greater than or equal to the length of the outer spline sleeve 631 on the movable sleeve 63, so as to ensure the necessary stroke length of the axial movement of the movable sleeve 63 and provide a sufficiently large rotational damping adjustment range.

[0054] In this embodiment, the mechanism further includes a paper separation mounting frame 200 and a paper pickup mounting frame 300; the gap between the paper separation mounting frame 200 and the paper pickup mounting frame 300 forms a paper feeding channel, the upper surface of the paper pickup mounting frame 300 is a plane, so as to provide comprehensive support for the paper, the paper separation shaft 10 is located between the paper separation mounting frame 200 and the paper pickup mounting frame 300, the mounting plate 120 is arranged on the paper pickup mounting frame 300, and the paper pickup shaft 20 is detachably arranged on the side of the paper pickup mounting frame 300 away from the paper separation mounting frame 200; wherein, the transmission assembly 80 is arranged on the paper pickup mounting frame 30 0, the adjustable damping shaft assembly 60 is fixedly arranged on the paper separation mounting frame 200, one end of the paper separation shaft 10 is detachably arranged on the paper separation mounting frame 200, and the other end is detachably connected to the paper separation mounting frame 200 through the adjustable damping shaft assembly 60, and two avoidance holes 130 are respectively provided on the paper pickup mounting frame 300 corresponding to the transmission assembly 80 and the paper pickup wheel 40; wherein, one end of the paper pickup shaft 20 is detachably connected to the paper pickup mounting frame 300 through the mounting plate 120, and the other end is directly buckled on the paper pickup mounting frame 300.

[0055] Furthermore, the elastic member 30 is generally a torsion spring, which is mounted on the paper separation mounting bracket 200 and indirectly provides the paper separation shaft 10 with the thrust required to move toward the paper pickup shaft 20 through the paper separation mounting bracket 200. The elastic member 30 is actually fixed to the internal structure of the scanner through a fixing rod. Of course, the elastic member 30 can also be a spring or an elastic metal strip.

[0056] In addition, this embodiment also provides a paper separation method of the above-mentioned scanner paper separation mechanism, the method comprising:

[0057] In the no-load process, the paper separation wheel 50 and the paper pickup wheel 40 keep synchronous rolling contact through the elastic force provided by the elastic member 30, and the transmission between the adjustable damping shaft assembly 80 and the paper separation shaft 10 fails;

[0058] During the paper feeding process, paper enters between the paper separation wheel 50 and the paper pickup wheel 40, and the paper separation shaft 10 realizes transmission recovery with the paper pickup shaft 20 through the cooperation of the adjustable damping shaft assembly and the transmission assembly;

[0059] During the paper feeding process, the paper separation wheel 50 rotates in the opposite direction relative to the paper pickup wheel 40 to implement a reverse paper kicking and paper separation operation.

[0060] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A scanner paper separation mechanism, characterized in that: It includes a paper separation shaft and a paper taking shaft arranged in parallel; and It also includes an elastic member that provides a force for the paper separation shaft to move toward the paper pickup shaft; It also includes a paper picking wheel and a paper separating wheel respectively arranged on the paper picking shaft and the paper separating shaft, and the paper picking wheel and the paper separating wheel are arranged radially opposite to each other; It also includes an adjustable damping shaft assembly coaxially connected to the paper separation shaft; It also includes a gear assembly arranged on the paper pickup shaft, and a transmission assembly that transmission-connects the gear assembly and the adjustable damping shaft assembly; Wherein, the adjustable damping shaft assembly realizes transmission engagement and separation with the gear assembly through the transmission assembly; when the transmission is engaged, the paper separation shaft has two states of reverse rotation and forward rotation, the reverse rotation state corresponds to the paper feeding process, and the forward rotation state corresponds to the no-load process; The adjustable damping shaft assembly comprises a shaft body coaxially connected to the paper separation shaft, a magnetic driving wheel coaxially arranged on the shaft body, and a movable sleeve coaxially connected to the paper separation shaft for axial sliding; the magnetic driving wheel is provided with an extended magnetic pole extending into the movable sleeve, the inner wall of the movable sleeve is provided with a magnet that can attract the extended magnetic pole, and the magnet and the extended magnetic pole are both provided in plurality and are evenly arranged around the shaft body; The magnetic driving wheel comprises a first annular magnetic wheel which is magnetized radially; an annular protrusion is coaxially arranged on the circumferential side wall of the first annular magnetic wheel; a plurality of first notch grooves are evenly distributed circumferentially on the annular protrusion; The transmission assembly comprises a second annular magnetic wheel which is radially magnetized and synchronously driven by the gear assembly; an annular groove which matches the annular protrusion is coaxially arranged on the circumferential side wall of the second annular magnetic wheel, and a plurality of second notch grooves are evenly distributed circumferentially on two opposite side walls of the annular groove; a Hall distance sensor element for detecting the radial distance between the annular protrusion and the inner wall of the annular groove is arranged on the inner wall of the annular groove; the inner and outer magnetic poles of the first annular magnetic wheel and the second annular magnetic wheel are the same; A Hall distance sensor element for detecting the radial distance between the annular protrusion and the inner wall of the annular groove is provided on the inner wall of the annular groove.

2. The scanner paper separation mechanism according to claim 1, characterized in that: The magnet is located at a side of the extended magnetic pole away from the rotating shaft body. When assembled in place, the extended magnetic pole and the magnet are slidably fitted.

3. The scanner paper separation mechanism according to claim 1, characterized in that: An inner sleeve connected to the paper separation wheel is coaxially provided on the paper separation shaft along its length direction, an inner spline sleeve is coaxially provided on the outer side wall of the inner sleeve away from the paper separation wheel, and an outer spline sleeve adapted to the inner cavity of the inner spline sleeve is coaxially provided on the movable sleeve.

4. The scanner paper separation mechanism according to claim 1, characterized in that: The magnetic drive wheel also includes a protective sleeve covering the outer side wall of the first annular magnetic wheel, and the extended magnetic pole extends out of the protective sleeve; an axial spacing adjustment groove is provided on an end surface of the protective sleeve facing the movable sleeve.

5. The scanner paper separation mechanism according to claim 1, characterized in that: The plurality of second notch grooves on two opposite side walls of the annular groove are circumferentially staggered and arranged, and the axial projections of the plurality of second notch grooves form a closed annular structure.

6. The scanner paper separation mechanism according to claim 1, characterized in that: The transmission assembly also includes a transmission hub on which the second annular magnetic wheel is mounted, and a transmission fixed shaft on which the transmission hub is fixed; the transmission fixed shaft is parallel to the paper picking shaft, and a tooth groove meshing with the gear assembly is also provided on the circumferential side wall of the second annular magnetic wheel, and the transmission hub is coaxially rotatably connected with the transmission fixed shaft.

7. The scanner paper separation mechanism according to claim 1, characterized in that: The scanner paper separation mechanism also includes a paper separation mounting frame and a paper pickup mounting frame; the gap between the paper separation mounting frame and the paper pickup mounting frame forms a paper feeding channel, the paper separation shaft is located between the paper separation mounting frame and the paper pickup mounting frame, and the paper pickup shaft is arranged on the side of the paper pickup mounting frame away from the paper separation mounting frame; the transmission assembly is arranged on the paper pickup mounting frame; the paper pickup mounting frame is provided with two avoidance holes corresponding to the transmission assembly and the paper pickup wheel.

8. A paper separation method for a scanner paper separation mechanism, applied to the scanner paper separation mechanism according to any one of claims 1 to 7, characterized in that: The method includes: In the no-load process, the paper separation wheel and the paper pickup wheel keep synchronous rolling contact through the elastic force provided by the elastic member, and the transmission between the adjustable damping shaft assembly and the paper separation shaft fails; During the paper feeding process, paper enters between the paper separation wheel and the paper pickup wheel, and the paper separation shaft realizes transmission recovery with the paper pickup shaft through the cooperation of the adjustable damping shaft assembly and the transmission assembly; During the paper feeding process, the paper separation wheel rotates in the opposite direction relative to the paper pickup wheel to achieve a reverse paper kicking and paper separation operation.

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