A flatbed scanner

Abstract

The utility model discloses a flatbed scanner, which belongs to the technical field of optical scanning, and comprises a plate-type scanning platform, the top surface of which is rotatably connected with a covering plate, and further comprises a conveying roller, a mounting frame, a conveying roller, an adjusting mechanism, a conveying panel, cleaning cotton, a cleaning brush, a placing panel, a driving roller and a tensioning mechanism; the utility model drives the conveying roller to move synchronously through the driving of a conveying motor, and through the mutual cooperation of the adjusting mechanism and the tensioning mechanism, the conveying roller and the driving roller are synchronously rotated in the same direction, and the conveying roller and the driving roller form synchronous reverse rotation, so as to form a conveying cleaning and flattening conveying process for paper archives, simplify the pre-cleaning and pre-flattening steps for paper archives, effectively improve the scanning efficiency of paper archives, and effectively improve the clarity of scanned images at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical scanning, and in particular relates to a flat-bed scanner. Background Art

[0002] The main function of a flatbed scanner is to scan documents through an optical device and then transfer the scanned documents to a computer for filing, modifying, and other operations on the documents. Therefore, most flatbed scanners are used in conjunction with computers.

[0003] In the prior art, in order to improve the convenience of file access, paper files are usually converted into electronic files through scanning technology, so as to facilitate subsequent access and use. At this time, a flatbed scanner is often used to scan the paper files. However, in the actual scanning process, due to the storage conditions of the paper files, dust is easily present on the surface. When the flatbed scanner is used to scan and preview the paper files, the scanned preview image is easily blurred. In addition, when the flatbed scanning is performed on the files with dust on the surface, the flat glass and cover plate of the flatbed scanner will also be contaminated, which increases the number of subsequent cleaning and maintenance of the flatbed scanner, which is time-consuming and labor-intensive.

[0004] Therefore, a flatbed scanner is needed to solve the problem in the prior art that when a file with dust on the surface is scanned by a flatbed scanner, the scanned image is not clear and the cleaning and maintenance frequency of the flatbed scanner is increased. Utility Model Content

[0005] The purpose of the utility model is to provide a flatbed scanner to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a flatbed scanner, comprising a plate-type scanning platform, the top surface of which is rotatably connected to a cover plate, and further comprising:

[0007] A fixed frame, the fixed frame is detachably arranged on the bottom surface of one side of the plate-type scanning platform, a fixed frame is fixed on the top surface of the fixed frame, the inner wall of the fixed frame is rotatably connected to a conveying roller, a conveying motor coaxially connected to the conveying roller is arranged on the outer end surface of the fixed frame, a mounting frame slidably connected to the inner wall of the fixed frame is arranged above the conveying roller, the inner wall of the mounting frame is rotatably connected to a conveying roller, and an adjustment mechanism is arranged between the fixed frame and the mounting frame;

[0008] A conveying panel, the top surface of the conveying panel and the top horizontal section of the conveying roller are located in the same horizontal plane and are fixed to the inner wall of the end surface of the fixing frame, the top surface of the conveying panel is embedded with cleaning cotton, and a cleaning brush fixed to the inner wall of the mounting frame is arranged above the cleaning cotton;

[0009] A placement panel is arranged at the front end of the conveying panel and fixed to an inner wall of one side of the fixing frame. A transmission roller is arranged between the placement panel and the conveying panel, and a tensioning mechanism is arranged between the transmission roller and the conveying roller.

[0010] It should be noted that the adjustment mechanism includes:

[0011] A pressing strip, the pressing strip is arranged above the fixing frame, and a plurality of pressing rods are arranged through the top surface of the fixing frame and are fixed to the opposite surfaces of the pressing strip and the mounting frame;

[0012] An adjusting bolt, wherein the adjusting bolt passes through the center of the pressing strip and the thread passes through the top surface of the fixing frame, the bottom end of the adjusting bolt contacts the top surface of the mounting frame, and the periphery of the adjusting bolt and the plurality of pressing rods are provided with compression springs fixed to the opposite surfaces of the mounting frame and the fixing frame.

[0013] It is further worth noting that the tensioning mechanism comprises:

[0014] Reversing gears, two reversing gears are provided and both are rotatably mounted on the outer surface of the end of the mounting frame, the two reversing gears are meshed and connected, and one of the reversing gears is coaxially fixed with the end of the transmission roller, and the other reversing gear, the end of the conveying roller and the end of the transmission roller are coaxially fixed with a transmission pulley, and the outer surfaces of the three transmission pulleys are provided with a transmission belt;

[0015] A limiting hole is provided, wherein the limiting holes are provided in plurality and are equidistantly opened on a side wall of the conveying panel, the inner wall of each limiting hole is slidably connected to a limiting rod, the ends of the plurality of limiting rods are commonly fixed with a moving frame, the transmission roller and one of the transmission pulleys rotate coaxially on the inner wall of the moving frame, and the outer surface of the limiting rod is provided with a tensioning spring fixed to the opposite surface of the moving frame and the conveying panel.

[0016] It should be further explained that a bar frame is fixed on the top surface of the movable frame, and a limiting sliding groove matching with the bar frame is provided on the top surface of the conveying panel.

[0017] As a preferred embodiment, the conveying panel, the strip frame and the top horizontal sections of the driving roller are all located on the same horizontal plane, the strip portion of the strip frame is located above multiple tensioning springs, and the fixed frame is located above the strip frame and is provided with a placement area extending upward.

[0018] As a preferred embodiment, the outer surfaces of the placement panel and the conveying panel at one end close to the drive pulley are provided with partition plates, and the outer surfaces of both ends of the fixed frame are provided with guide grooves that cooperate with the drive roller and the conveying roller.

[0019] Compared with the prior art, the flatbed scanner provided by the utility model has at least the following beneficial effects:

[0020] (1) The conveying motor drives the conveying roller to move synchronously. Through the cooperation of the adjustment mechanism and the tensioning mechanism, the conveying roller and the transmission roller rotate synchronously in the same direction, and the conveying roller and the transmission roller rotate synchronously in the opposite direction, so as to realize the conveying cleaning and flattening of paper archives, simplify the pre-cleaning and pre-flattening steps of paper archives, effectively improve the scanning efficiency of paper archives, and effectively improve the clarity of the scanned images.

[0021] (2) Through the adjustment of the adjustment mechanism, the spacing between the conveying roller and the transmission roller is adjusted and locked. Then, through the cooperation of the adjustment mechanism and the tensioning mechanism, the spacing between the drive roller and the conveying roller is adjusted synchronously, and the transmission belt and the three transmission pulleys are still tensioned, so that it is suitable for conveying, cleaning and flattening paper files of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a partial structural schematic diagram of the conveying panel and the placement panel of the utility model;

[0024] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 4 It is a schematic diagram of the partial structure inside the fixed frame of the utility model;

[0026] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 6 It is a schematic diagram of the local structure of the compression spring of the utility model.

[0028] In the figure: 1. Plate scanning table; 2. Covering plate; 3. Fixed frame; 4. Fixed frame; 5. Conveying roller; 6. Conveying motor; 7. Mounting frame; 8. Conveying roller; 9. Adjusting mechanism; 91. Pressing bar; 92. Pressing rod; 93. Adjusting bolt; 94. Compression spring; 10. Conveying panel; 11. Cleaning cotton; 12. Cleaning brush; 13. Placement panel; 14. Transmission roller; 15. Tensioning mechanism; 151. Reversing gear; 152. Transmission pulley; 153. Transmission belt; 154. Limiting hole; 155. Limiting rod; 156. Moving frame; 157. Tensioning spring; 16. Bar frame; 17. Limiting slide; 18. Partition plate; 19. Guide slide. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 1-6 The utility model provides a flatbed scanner, including a plate-type scanning platform 1, the top surface of the plate-type scanning platform 1 is rotatably connected with a cover plate 2, and also includes a fixing frame 3, the fixing frame 3 is detachably arranged on the bottom surface of one side of the plate-type scanning platform 1, the top surface of the fixing frame 3 is fixed with a fixing frame 4, the inner wall of the fixing frame 4 is rotatably connected with a conveying roller 5, the outer end surface of the fixing frame 4 is provided with a conveying motor 6 coaxially connected with the conveying roller 5, the upper part of the conveying roller 5 is provided with a mounting frame 7 slidably connected with the inner wall of the fixing frame 4, the inner wall of the mounting frame 7 is rotatably connected with a conveying roller 8, and an adjusting mechanism 9 is provided between the fixing frame 4 and the mounting frame 7;

[0031] It should be noted that a flat glass is embedded on the top surface of the plate-type scanning platform 1, and a pressing plate is embedded on the bottom of the cover plate 2, which is used for the plate-type scanning platform 1 to compact and cover the paper archives when scanning them, and to flatten the paper archives to a certain extent. The outer surface of the fixed frame 4 is fitted with the surface of the plate-type scanning platform 1, and a paper archive conveying channel is opened at the height of the flat glass, and the width of the archive conveying channel is adapted to the width of the flat glass.

[0032] The bottom surface of the plate-type scanning platform 1 is provided with a convex column for docking with the fixing frame 3, and the bottom surface of the fixing frame 3 is provided with a docking hole matched with the convex column, so that the fixing frame 3 and the fixing frame 4 can be detachably arranged on one side of the plate-type scanning platform 1;

[0033] It should be noted that the height of the mounting frame 7 is adjusted by the adjusting mechanism 9, so as to adjust the distance between the conveying roller 5 and the driving roller 14, so as to be suitable for conveying paper files of different thicknesses, until the paper files are conveyed to the top flat glass of the plate-type scanning table 1, and after the position of the paper files is adjusted, the paper files are covered by the covering plate 2, and then scanned;

[0034] A conveying panel 10, the top surface of which is located at the same level as the top horizontal section of the conveying roller 5 and is fixed to the inner wall of the end surface of the fixing frame 4, a cleaning cotton 11 is embedded in the top surface of the conveying panel 10, and a cleaning brush 12 fixed to the inner wall of the mounting frame 7 is arranged above the cleaning cotton 11;

[0035] A placement panel 13, which is arranged at the front end of the conveying panel 10 and fixed to an inner wall of one side of the fixing frame 4, a transmission roller 14 is arranged between the placement panel 13 and the conveying panel 10, and a tensioning mechanism 15 is arranged between the transmission roller 14 and the conveying roller 5;

[0036] It should be noted that when the paper file is placed on the top surface of the placement panel 13, when it contacts the transmission roller 14, the transmission roller 14 and the transmission roller 5 rotate in the same direction through the driving of the transmission motor 6 and the transmission of the tensioning mechanism 15, so as to realize the double transmission of the paper file, and the transmission roller 8 rotates in the synchronous direction with the transmission roller 5 through the transmission of the tensioning mechanism 15 until the paper file is transported from the transmission channel of the fixed frame 4 to the top surface of the flat glass;

[0037] Before the paper file is conveyed to the top surface of the conveying roller 5 by the driving roller 14, the paper file passes through the top surface of the conveying panel 10 by the inertia of the driving roller 14. At this time, the bottom surface of the paper file is wiped and cleaned by the cleaning cotton 11, and the top surface of the paper file is cleaned and dusted by the cleaning brush 12, thereby forming a conveying and cleaning process of the paper file. Finally, it is conveyed to the top flat glass of the plate-type scanning table 1 by the conveying roller 5 and the transmission roller 8, and then optical scanning is performed by covering.

[0038] It should be noted that the paper archives are transported by synchronous counter-rotating conveying rollers 8 and conveying rollers 5 through spacing adjustment, which can flatten the paper archives to a certain extent, thereby flattening some paper archives with wrinkles. The double-sided conveying dust removal treatment of the cleaning cotton 11 and the cleaning brush 12 can further improve the clarity of the optical scanning image of the paper archives through the plate scanning table 1, and effectively reduce the number of cleaning times for the flat glass and the pressure plate of the plate scanning table 1.

[0039] Further as Figure 1 , Figure 3 and Figure 6 As shown, it is worth to explain in detail that the adjustment mechanism 9 includes a pressing strip 91, which is arranged above the fixing frame 4, and a plurality of pressing rods 92 are arranged through the top surface of the fixing frame 4 and are fixed to the pressing strip 91 and the opposite surface of the mounting frame 7;

[0040] An adjusting bolt 93, the adjusting bolt 93 passes through the center of the pressing strip 91 and the thread passes through the top surface of the fixing frame 4, the bottom end of the adjusting bolt 93 contacts the top surface of the mounting frame 7, and the periphery of the adjusting bolt 93 and the plurality of pressing rods 92 are provided with compression springs 94 fixed to the opposite surfaces of the mounting frame 7 and the fixing frame 4;

[0041] It should be noted that when the bottom surface of the adjusting bolt 93 does not contact the top surface of the installation frame 7, the conveying roller 8 will move upward along with the installation frame 7 on the inner wall of the fixed frame 4 through the elastic force of the plurality of compression springs 94 and the limiting effect of the pressing rod 92, thereby increasing the spacing value between the conveying roller 8 and the conveying roller 5. Subsequently, the adjusting bolt 93 is threadedly connected to the fixed frame 4 and the bottom end of the adjusting bolt 93 contacts the top surface of the installation frame 7, thereby fixing the spacing value between the conveying roller 5 and the conveying roller 8. This is applied to conveying, dusting and flattening paper archives of different thicknesses. Compared with the method of pre-cleaning, flattening and optically scanning paper archives in the prior art, it is more time-saving and labor-saving, and the image after optical scanning will be clearer.

[0042] It should be noted that when it is necessary to increase the spacing between the conveying roller 8 and the conveying roller 5, the adjusting bolt 93 is loosened by rotating the thread on the top surface of the fixed frame 4. By releasing the interference with the top surface of the mounting frame 7, the elastic force of the compression spring 94 can be used to increase the spacing between the conveying roller 8 and the conveying roller 5. Subsequently, the spacing between the conveying roller 8 and the conveying roller 5 can be fixed by adjusting the interference limit of the adjusting bolt 93, thereby completing the adjustment of the spacing value.

[0043] Further as Figure 2 , Figure 3 and Figure 4 As shown, it is worth specifically explaining that the tensioning mechanism 15 includes a reversing gear 151, two reversing gears 151 are provided and are rotatably mounted on the outer surface of the end of the mounting frame 7, the two reversing gears 151 are meshed and connected, and one of the reversing gears 151 is coaxially fixed with the end of the transmission roller 14, and the other reversing gear 151, the end of the conveying roller 5 and the end of the transmission roller 14 are coaxially fixed with a transmission pulley 152, and the outer surfaces of the three transmission pulleys 152 are provided with a transmission belt 153;

[0044] A limiting hole 154, wherein the limiting holes 154 are provided in plurality and are equidistantly provided on a side wall of the conveying panel 10, the inner wall of each limiting hole 154 is slidably connected to a limiting rod 155, the ends of the plurality of limiting rods 155 are commonly fixed with a moving frame 156, the driving roller 14 and one of the driving pulleys 152 are coaxially rotated on the inner wall of the moving frame 156, and the outer surface of the limiting rod 155 is provided with a tensioning spring 157 fixed to the opposite surface of the moving frame 156 and the conveying panel 10;

[0045] It should be noted that the three pulleys are arranged in a sharp triangle, and the transmission belt 153 is sleeved on the inner surface of the three transmission pulleys 152, and the wrap angle value formed by them is greater than 120 degrees. When the height value of the transmission pulley 152 on the mounting frame 7 changes, since the inner surface circumference of the transmission pulley 152 remains the same, the transmission pulley 152 located on the transmission roller 14 will approach the conveying roller 5. At this time, the wrap angle formed by the transmission belt 153 on the inner surface of the three transmission pulleys 152 is also greater than 120 degrees. Therefore, the three transmission pulleys 152 can rotate in the same direction through the drive of the conveying motor 6, and through the reverse meshing transmission effect of the two reversing gears 151, the transmission pulley 152 and the conveying roller 8 are arranged to rotate in the opposite direction, that is, the conveying roller 5 and the conveying roller 8 are arranged to rotate in the opposite direction synchronously, so that the paper files entering between the conveying roller 5 and the conveying roller 8 can be better conveyed and flattened.

[0046] It should be noted that when the installation frame 7 increases the spacing value between the transmission roller 8 and the conveying roller 5 through the adjustment mechanism 9, the transmission wheel on the installation frame 7 moves upward synchronously. Since the transmission belt 153 is elastically acted upon by a plurality of tensioning springs 157, it is fitted between the inner surfaces of the three transmission pulleys 152. At this time, the transmission pulley 152 on the transmission roller 14 drives the tensioning spring 157 to be compressed through the action of the moving frame 156 and the limiting rod 155, thereby adjusting the wrap angle of the transmission belt 153 on the transmission pulley 152. At this time, the transmission motor 6 drives the three transmission pulleys 152 to move upward. The transmission of the drive pulley 152 and the drive belt 153 and the reverse meshing transmission of the two reversing gears 151, at this time, the conveying roller 5 and the driving roller 14 rotate synchronously in the same direction, and the conveying roller 5 and the driving roller 14 form a synchronous reverse rotation, that is, the double-sided cleaning of the paper archives through the driving roller 14 and the continuous flattening and conveying treatment of the conveying roller 5 and the conveying roller 8 are performed, forming the conveying cleaning and flattening conveying treatment of the paper archives, simplifying the pre-cleaning and pre-flattening steps of the paper archives, effectively improving the scanning efficiency of the paper archives, and at the same time effectively improving the clarity of the scanned image.

[0047] Further Figure 1 and Figure 2As shown, it is worth explaining in detail that a strip frame 16 is fixed to the top surface of the movable frame 156, and a limiting slide groove 17 matching with the strip frame 16 is provided on the top surface of the conveying panel 10. The arrangement of the strip frame 16 and the limiting slide groove 17 can not only enhance the stability of the movement of the movable frame 156 when it is moved and adjusted, but also effectively connect the transmission roller 14 and the conveying panel 10 to prevent paper files from falling between the transmission roller 14 and the conveying panel 10 during the conveying process and causing interference.

[0048] The scheme has the following working process: when optically scanning paper files, firstly, according to the thickness of the paper files, the spacing between the conveying roller 5 and the conveying roller 8 is adjusted and locked through the adjustment of the adjustment mechanism 9, and then the spacing between the transmission roller 14 and the conveying roller 5 is synchronously adjusted through the cooperation of the adjustment mechanism 9 and the tensioning mechanism 15, and the transmission belt 153 and the three transmission pulleys 152 are still tensioned;

[0049] The paper file to be scanned is placed on the placement panel 13, and the paper file is pushed to move toward the transmission roller 14. At this time, the conveying motor 6 drives the conveying roller 5 to move synchronously. At the same time, through the transmission effect of the tensioning mechanism 15, the transmission roller 14 rotates synchronously with the transmission roller 14, that is, the conveying roller 5 and the transmission roller 14 rotate synchronously in the same direction, and the conveying roller 5 and the transmission roller 14 rotate synchronously in the opposite direction, that is, the paper file is transported by the transmission roller 14 and the double-sided cleaning and flattening of the conveying roller 5 and the transmission roller 8 are carried out, which simplifies the pre-cleaning and pre-flattening steps of the paper file, effectively improves the scanning efficiency of the paper file, and effectively improves the clarity of the scanned image.

[0050] Further as Figure 4 and Figure 6 As shown, it is worth explaining in detail that the top horizontal sections of the conveying panel 10, the strip frame 16 and the driving roller 14 are all located on the same horizontal plane, which improves the cleanliness and stability of the flat conveying of paper files. The strip portion of the strip frame 16 is located above the multiple tensioning springs 157 to prevent the paper files from falling and affecting the tensioning springs 157. The fixed frame 4 is located above the strip frame 16 and is provided with an upward extending placement area to improve the convenience of placing the paper files on the driving roller 14.

[0051] Further as Figure 1 and Figure 3As shown, it is worth explaining in detail that a partition plate 18 is provided on the outer surface of one end of the placement panel 13 and the conveying panel 10 close to the transmission pulley 152. The partition plate 18 is used to isolate the transmission belt 153 and the transmission pulley 152, effectively preventing paper files from entering the transmission pulley 152 and the transmission belt 153 and causing an impact. The outer surfaces of both ends of the fixed frame 4 are provided with guide grooves 19 that cooperate with the transmission roller 14 and the conveying roller 8 to enhance the stability of the installation frame 7 and the transmission roller 14 during displacement adjustment.

[0052] The conveying motor 6 can be purchased from the market and equipped with a power supply. It is a mature technology in this field and has been fully disclosed, so it will not be repeated in the specification.

[0053] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0054] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A flatbed scanner, comprising a plate-type scanning platform (1), the top surface of the plate-type scanning platform (1) being rotatably connected to a cover plate (2), characterized in that: Also includes: A fixed frame (3), the fixed frame (3) is detachably arranged on the bottom surface of one side of the plate-type scanning platform (1), a fixed frame (4) is fixed on the top surface of the fixed frame (3), the inner wall of the fixed frame (4) is rotatably connected to a conveying roller (5), the outer end surface of the fixed frame (4) is provided with a conveying motor (6) coaxially connected to the conveying roller (5), a mounting frame (7) slidably connected to the inner wall of the fixed frame (4) is arranged above the conveying roller (5), the inner wall of the mounting frame (7) is rotatably connected to a conveying roller (8), and an adjustment mechanism (9) is arranged between the fixed frame (4) and the mounting frame (7); A conveying panel (10), wherein the top surface of the conveying panel (10) and the horizontal section of the top of the conveying roller (5) are located at the same horizontal plane and are fixed to the inner wall of the end surface of the fixing frame (4), the top surface of the conveying panel (10) is embedded with a cleaning cotton (11), and a cleaning brush (12) fixed to the inner wall of the mounting frame (7) is arranged above the cleaning cotton (11); A placement panel (13) is arranged at the front end of the conveying panel (10) and is fixed to an inner wall of one side of the fixing frame (4); a transmission roller (14) is arranged between the placement panel (13) and the conveying panel (10); and a tensioning mechanism (15) is arranged between the transmission roller (14) and the conveying roller (5).

2. The flatbed scanner according to claim 1, wherein: The regulating mechanism (9) comprises: A pressing strip (91), the pressing strip (91) being arranged above the fixing frame (4), and a plurality of pressing rods (92) are provided through the top surface of the fixing frame (4) and are fixed to the opposite surfaces of the pressing strip (91) and the mounting frame (7); An adjusting bolt (93), the adjusting bolt (93) passes through the center of the pressing strip (91) and the thread passes through the top surface of the fixing frame (4), the bottom end of the adjusting bolt (93) contacts the top surface of the mounting frame (7), and the outer periphery of the adjusting bolt (93) and the plurality of pressing rods (92) are provided with compression springs (94) fixed to the opposite surfaces of the mounting frame (7) and the fixing frame (4).

3. The flatbed scanner according to claim 2, wherein: The tensioning mechanism (15) comprises: a reversing gear (151), wherein two reversing gears (151) are provided and are both rotatably mounted on the outer surface of the end of the mounting frame (7), the two reversing gears (151) are meshingly connected and one of the reversing gears (151) is coaxially fixedly arranged with the end of the transmission roller (14), the other reversing gear (151), the end of the conveying roller (5) and the end of the transmission roller (14) are coaxially fixed with a transmission pulley (152), and the outer surfaces of the three transmission pulleys (152) are provided with a transmission belt (153); A limiting hole (154), wherein the limiting holes (154) are provided in plurality and are equidistantly opened on a side wall of the conveying panel (10), the inner wall of each limiting hole (154) is slidably connected to a limiting rod (155), the ends of the plurality of limiting rods (155) are commonly fixed with a moving frame (156), the driving roller (14) and one of the driving pulleys (152) are coaxially rotated on the inner wall of the moving frame (156), and the outer surface of the limiting rod (155) is provided with a tensioning spring (157) fixed to the opposite surface of the moving frame (156) and the conveying panel (10).

4. The flatbed scanner according to claim 3, wherein: A strip frame (16) is fixed on the top surface of the movable frame (156), and a limiting sliding groove (17) matching with the strip frame (16) is provided on the top surface of the conveying panel (10).

5. The flatbed scanner according to claim 4, wherein: The top horizontal sections of the conveying panel (10), the strip frame (16) and the driving roller (14) are all located on the same horizontal plane, the strip-shaped portion of the strip frame (16) is located above a plurality of tensioning springs (157), and the fixed frame (4) is located above the strip frame (16) and is provided with a placement area extending upward.

6. The flatbed scanner according to claim 4, wherein: The outer surfaces of one end of the placement panel (13) and the conveying panel (10) close to the transmission pulley (152) are provided with a partition plate (18), and the outer surfaces of both ends of the fixed frame (4) are provided with guide grooves (19) that cooperate with the transmission roller (14) and the conveying roller (8).

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