CN112954125A

CN112954125A - Scanner

Info

Publication number: CN112954125A
Application number: CN202110047341.4A
Authority: CN
Inventors: 朱海涛; 高永航
Original assignee: Individual
Current assignee: Suzhou Baiyi Technology Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-06-11
Anticipated expiration: 2041-01-14
Also published as: CN112954125B

Abstract

The invention relates to the technical field of scanners, in particular to a scanner which comprises a support, a support plate, a scanning flat plate, a fixed flat laying mechanism, an automatic dust removing mechanism and a folding protection mechanism. The fixed flat laying mechanism comprises a rotating block, a supporting column, a rolling support and a roller. The automatic dust removing mechanism comprises a dust suction groove, a dust suction box and a piston rod. Folding protection mechanism includes electronic flexible post, lift pillar, scanning camera. Through setting up fixed tiling mechanism, be favorable to tiling the paper data of fold and fix on the scanning flat board, make things convenient for the scanning camera to scan the information on the data. Through setting up automatic dust removal mechanism, be favorable to clearing up the dust on the scanning flat board, be applicable to and scan the work to the paper data that have a large amount of dust. Through setting up folding protection machanism, be favorable to protecting the scanner, conveniently carry the transport to the scanner.

Description

Scanner

Technical Field

The invention relates to the technical field of scanners, in particular to a scanner.

Background

A scanner is a device that converts graphic or image information into digital signals in a scanning manner using a photoelectric technology and a digital processing technology. Scanners are commonly used in computer peripheral devices by capturing images and converting them into digitized input devices that a computer can display, edit, store, and output. At present, the scanners are roughly of several types, such as drum scanners, plane scanners, pen scanners and portable scanners.

The existing plane scanner has certain defects. The traditional plane scanner lacks a fixed flat laying mechanism and is not suitable for scanning paper data with folds. The traditional plane scanner lacks an automatic dust removal mechanism and is not suitable for scanning paper data with a large amount of dust. Traditional planar scanner lacks folding protection mechanism, and the scanner is inconvenient to carry the transport, and the scanner receives the damage easily in handling.

Disclosure of Invention

The invention aims to provide a scanner. The technical problems that an existing plane scanner is not suitable for scanning paper data with folds and a large amount of dust, the plane scanner is inconvenient to carry and transport, the plane scanner is easy to damage in the transport process, and certain influence is caused on data scanning work can be solved.

The purpose of the invention can be realized by the following practical technical scheme:

the utility model provides a scanner, includes support, extension board, scanning flat board, fixed tiling mechanism, automatic dust removal mechanism, folding protection mechanism, the middle part fixedly connected with extension board of support, the upper portion fixedly connected with scanning flat board of support installs fixed tiling mechanism between scanning flat board and the extension board, installs automatic dust removal mechanism on the scanning flat board, and slidable mounting has folding protection mechanism between scanning flat board and the support.

The fixed flat-laying mechanism comprises a rotating block, supporting columns, a rolling support and a roller, wherein the top of a support plate is rotatably connected with the rotating block at a position close to the center, one end of the top of the rotating block is rotatably connected with a first ejector rod, the other end of the top of the rotating block is rotatably connected with a second ejector rod, one end of the first ejector rod, which is far away from the rotating block, is rotatably connected to a first sliding table, one end of the second ejector rod, which is far away from the rotating block, is rotatably connected to a second sliding table, the middle part of a support seat, which is close to the upper part of the support plate, is fixedly connected with a sliding rod, the first sliding table and the second sliding table are both slidably connected with the sliding rod, two ends of the top of the first sliding table and the second sliding table are both fixedly connected with the supporting columns, one sides, which are close to the second sliding table, of the upper parts of two, the rolling support internal rotation is connected with the cylinder, and extension board and the short side link of fixedly connected with are passed to the bottom of turning block, and the one end that the turning block was kept away from to short side link rotates and is connected with the connecting rod, and the one end that the short side link was kept away from to the connecting rod rotates and is connected with long side link, and the one end that the connecting rod was kept away from to long side link rotates with the bottom of extension board to be connected, and the other end fixedly connected with handle.

Preferably, folding protection machanism includes electronic flexible post, the lift pillar, the scanning camera, fixed mounting has electronic flexible post between first sliding stand and second sliding stand on the lower part platform of support, the one end fixedly connected with lift pillar that electronic flexible post is close to the extension board, lift pillar and extension board sliding connection, the one end that the extension board was kept away from to the lift pillar is passed the scanning flat board and rather than sliding connection, the equal fixedly connected with shelves pole in upper portion both sides of lift pillar, one side fixedly connected with fixture block that shelves pole and rolling support are relative, one side rotatable coupling that the upper portion of lift pillar is close to the cylinder has the scanning camera.

Preferably, automatic dust removal mechanism includes the dust absorption groove, the dust absorption case, the piston rod, the dust absorption groove has been seted up at the dull and stereotyped top of scanning between two cylinders, the dull and stereotyped bottom of scanning is at dust absorption groove below fixedly connected with dust absorption case, a plurality of dust absorption hole has been seted up to the dust absorption inslot, the dust absorption hole is linked together with the dust absorption case, the inside of dust absorption case is close to dust absorption hole below fixedly connected with air guide plate, the one end fixedly connected with air guide case of dust absorption case, air guide case and dust absorption case are linked together, one side fixedly connected with air duct of air guide case, air duct and air guide case communicate mutually, the inside sliding connection of air duct has the piston rod, the one end fixed connection that the air duct was kept away from to the piston.

Preferably, a spring is fixedly installed between the rolling support and the support column, two ends of the roller are in a ratchet shape, a bolt is arranged at the end part, close to the roller, of the rolling support, and the bolt can be inserted into a ratchet groove.

Preferably, the fixture block can be clamped on the rolling bracket.

Preferably, one side of the air guide plate, which is opposite to the dust suction hole, is provided with a cylindrical plug matched with the dust suction hole, and the air guide plate is made of elastic breathable materials.

Preferably, a dust suction cavity is arranged between the air guide plate and the inner wall of the top of the dust suction box.

Preferably, the outer wall of the drum is a soft fiber material.

The invention has the beneficial effects that:

1. the fixed spreading mechanism is arranged, so that the folded paper data can be spread and fixed on the scanning flat plate, the scanning camera can scan the information on the data conveniently, and compared with the traditional scanner, the scanner disclosed by the invention can be used for scanning the folded paper data efficiently.

2. Through setting up automatic dust removal mechanism, be favorable to clearing up the dust on the scanning flat board, be applicable to and scan the work to the paper data that has a large amount of dusts, automatic dust removal mechanism and fixed tiling mechanism correlation can go on simultaneously, can play certain complementary action to the fixed tiling of paper data in the time of automatic dust removal mechanism dust absorption.

3. Through setting up folding protection mechanism, be favorable to protecting the scanner, conveniently carry the transport to the scanner, the roll support can be used to lift the cylinder when carrying out scanning operation, and when the scanner was out of work, the roll support was fixed and can be lifted whole equipment as the handle.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of an overall structure of a scanner according to the present invention.

Fig. 2 is a schematic structural diagram of a fixed tiling mechanism of a scanner according to the present invention.

Fig. 3 is a schematic structural diagram of an automatic dust removing mechanism of a scanner provided by the invention.

Fig. 4 is a schematic structural diagram of a folded state of the scanner according to the present invention.

Fig. 5 is a top view of fig. 1 of a scanner provided by the present invention.

Fig. 6 is a schematic structural diagram of a link mechanism at the bottom of the fixed flat-laying mechanism of the invention of a scanner provided by the invention.

Fig. 7 is a top view of fig. 6 of a scanner provided by the present invention.

In the figure: 1. a support; 2. a support plate; 3. scanning the flat plate; 4. a lifting column; 5. scanning a camera; 6. rotating the block; 7. a first ejector rod; 8. a second ejector rod; 9. a first slide table; 10. a second sliding table; 11. a support pillar; 12. a rolling support; 13. a spring; 14. a drum; 15. a bolt; 16. a short side link; 17. a connecting rod; 18. a long side link; 19. a handle; 20. an air duct; 21. a piston rod; 22. an air guide box; 23. a dust collection groove; 24. a dust collection box; 25. a gas guide plate; 26. a dust suction chamber; 27. a dust collection hole; 28. an electric telescopic column; 29. a slide bar; 30. a stop lever; 31. and (7) clamping blocks.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, a scanner includes a support 1, a support plate 2, a scanning plate 3, a fixed spreading mechanism, an automatic dust removing mechanism, and a folding protection mechanism, wherein the support plate 2 is fixedly connected to the middle of the support 1, the scanning plate 3 is fixedly connected to the upper portion of the support 1, the fixed spreading mechanism is installed between the scanning plate 3 and the support plate 2, the automatic dust removing mechanism is installed on the scanning plate 3, and the folding protection mechanism is slidably installed between the scanning plate 3 and the support 1.

Fixed tiling mechanism includes turning block 6, support column 11, rolling support 12, cylinder 14, the top of extension board 2 is being close to central point and is put the department and rotate and be connected with turning block 6, the top one end of turning block 6 is rotated and is connected with first ejector pin 7, the top other end of turning block 6 is rotated and is connected with second ejector pin 8, the one end that turning block 6 was kept away from to first ejector pin 7 is rotated and is connected on first sliding table 9, the one end that turning block 6 was kept away from to second ejector pin 8 is rotated and is connected on second sliding table 10, the middle part of support 1 is close to the top fixedly connected with slide bar 29 of extension board 2, first sliding table 9 and second sliding table 10 all with slide bar 29 sliding connection, the equal fixedly connected with support column 11 in top both ends of first sliding table 9 and second sliding table 10, the upper portion of two support columns 11 that are located first sliding table 9 is close to one side of second sliding table 10 and is located one side that the upper portion of two support columns 11 of second sliding table 10 is close to There is rolling support 12, rolling support 12 internal rotation is connected with cylinder 14, and extension board 2 and fixedly connected with short side link 16 are passed to the bottom of turning block 6, and the one end that turning block 6 was kept away from to short side link 16 rotates and is connected with connecting rod 17, and the one end that short side link 16 was kept away from to connecting rod 17 rotates and is connected with long side link 18, and the one end that connecting rod 17 was kept away from to long side link 18 rotates with the bottom of extension board 2 and is connected, and the other end fixedly connected with handle 19 of long side link 18. When the scanner is used for scanning, the roller 14 is lifted through the rolling support 12, then paper materials are placed on the scanning flat plate 3, the roller 14 is put down, after the position of the paper materials is fixed, the handle 19 is shifted, the rotating block 6 rotates, when the rotating block 6 rotates, the rotating block 6 pushes the first sliding table 9 to the direction far away from the rotating block 6 through the first ejector rod 7, the rotating block 6 pushes the second sliding table 10 to the direction opposite to the first sliding table 9 through the second ejector rod 8, and therefore the first sliding table 9 and the second sliding table 10 are opposite to each other. Because the upper parts of the first sliding table 9 and the second sliding table 10 are both connected with the rolling support 12 and the rollers 14, when the first sliding table 9 and the second sliding table 10 are back to back, the two rollers 14 are driven to back on the surface of the paper data, so that the effect of flattening the folds of the paper data is achieved.

As a technical optimization scheme of the invention, the folding protection mechanism comprises an electric telescopic column 28, a lifting support column 4 and a scanning camera 5, wherein the electric telescopic column 28 is fixedly arranged between a first sliding table 9 and a second sliding table 10 on a lower platform of the support 1, one end, close to the support plate 2, of the electric telescopic column 28 is fixedly connected with the lifting support column 4, the lifting support column 4 is in sliding connection with the support plate 2, one end, far away from the support plate 2, of the lifting support column 4 penetrates through the scanning flat plate 3 and is in sliding connection with the scanning flat plate 3, two sides of the upper part of the lifting support column 4 are fixedly connected with stop rods 30, one side, opposite to the rolling support 12, of each stop rod 30 is fixedly connected with a fixture block 31, and one side, close to the roller 14. After using the scanner to accomplish the scanning work, stir handle 19 and push away two cylinders 14 to the intermediate position of scanning flat board 3, it makes it get into the recess that sets up on lifting support 4 completely to rotate scanning camera 5 downwards, then start electronic flexible post 28, electronic flexible post 28 shortens and drives lifting support 4 and descends, lifting support 4's both sides are connected with pin 30, when descending a certain position, the fixture block 31 joint of connecting on pin 30 is on rolling support 12, fix rolling support 12 and prevent to rock about its upper and lower, electronic flexible post 28 stops to shorten this moment, the scanner gets into the inoperative state.

As a technical optimization scheme of the invention, the automatic dust removing mechanism comprises a dust suction groove 23, a dust suction box 24 and a piston rod 21, the dust suction groove 23 is formed in the top of the scanning flat plate 3 between the two rollers 14, the dust suction box 24 is fixedly connected to the bottom of the scanning flat plate 3 below the dust suction groove 23, a plurality of dust suction holes 27 are formed in the dust suction groove 23, the dust suction holes 27 are communicated with the dust suction box 24, an air guide plate 25 is fixedly connected to the position, close to the lower portion of the dust suction holes 27, in the dust suction box 24, one end of the dust suction box 24 is fixedly connected with an air guide box 22, the air guide box 22 is communicated with the dust suction box 24, an air guide pipe 20 is fixedly connected to one side of the air guide box 22, the air guide pipe 20 is communicated with the air guide box 22, the piston rod 21 is slidably connected to the inner portion of the air guide pipe 20. When a large amount of dust falls on the scanning flat plate 3, the next scanning operation is affected, at this time, the two rollers 14 are shifted to the two ends of the top of the scanning flat plate 3, the pins 15 are inserted into the ratchet grooves at the two ends of the rollers 14, so that the rollers 14 can be fixed, the handle 19 is shifted to make the two rollers 14 move towards each other, and finally pushed to the dust suction groove 23, so that the dust on the surface of the scanning flat plate 3 can be pushed into the dust suction groove 23. When the next scanning operation is carried out, the handle 19 is shifted to enable the two rollers 14 to move back and forth, the paper data are flattened and fixed, the piston rod 21 is pulled by the supporting column 11 connected with the piston rod 21, the piston rod 21 slides in the air guide tube 20 and sucks air from the air guide box 22 and the dust suction box 24, due to the downward elastic depression of the air guide plate 25 under the elastic action, dust in the dust suction groove 23 is sucked into the dust suction cavity 26 while air flow enters the dust suction box 24 from the dust suction hole 27 above the air guide plate 25, the air flow can also generate attraction to adsorb the middle part of the paper data on the scanning flat plate 3, the auxiliary rollers 14 are used for flatly laying and fixing the paper data, and the scanning camera 5 can scan the paper data conveniently.

As a technical optimization scheme of the invention, a spring 13 is fixedly arranged between a rolling support 12 and a support column 11, two ends of a roller 14 are in a ratchet shape, a bolt 15 is arranged at the end part of the rolling support 12 close to the roller 14, and the bolt 15 can be inserted into a ratchet groove.

As a technical optimization scheme of the present invention, the fixture block 31 may be clamped on the rolling bracket 12.

As a technical optimization scheme of the invention, one side of the air guide plate 25, which is opposite to the dust suction hole 27, is provided with a cylindrical plug matched with the dust suction hole 27, and the air guide plate 25 is made of elastic breathable materials.

As a technical optimization scheme of the invention, a dust suction cavity 26 is arranged between the air guide plate 25 and the top inner wall of the dust suction box 24.

As a technical optimization of the present invention, the outer wall of the drum 14 is made of soft fiber material.

The working principle is as follows: when the scanner is used for scanning, the roller 14 is lifted up through the rolling bracket 12, then the paper data is placed on the scanning flat plate 3, the roller 14 is put down, and the roller 14 generates extrusion force on the paper data under the action of the spring 13 and fixes the paper data on the scanning flat plate 3. After the position with the paper data is fixed, stir handle 19, because handle 19 is fixed on long side link 18, long side link 18 rotates and connects in the bottom of extension board 2, short side link 16 rotates the bottom of connecting in extension board 2 equally, connect through connecting rod 17 between long side link 18 and the short side link 16, so extension board 2, long side link 18, short side link 16 and connecting rod 17 constitute a four-bar linkage jointly, so when stirring handle 19, the angle of short side link 16 pivoted is greater than the angle of stirring handle 19 pivoted, set up this mechanism and be favorable to making turning block 6 obtain required pivoted angle more easily. When the rotating block 6 rotates, the rotating block 6 pushes the first sliding table 9 in a direction away from the rotating block 6 by the first push rod 7, and the rotating block 6 pushes the second sliding table 10 in a direction opposite to the first sliding table 9 by the second push rod 8, so that the first sliding table 9 and the second sliding table 10 are opposite to each other. Because the upper portions of the first sliding table 9 and the second sliding table 10 are connected with the rolling support 12 and the rollers 14, when the first sliding table 9 and the second sliding table 10 are back to back, the two rollers 14 are driven to back on the surface of the paper data, so that the effect of flattening the wrinkles of the paper data is achieved, and if the effect of flattening is not achieved for one time, the handle 19 can be toggled to repeatedly flatten the wrinkles.

After the data with a large amount of dust is scanned, the surface of the scanning flat plate 3 may have dust left thereon, which affects the next scanning operation, at this time, the two rollers 14 are shifted to both ends of the scanning flat plate 3, the pins 15 are inserted into the ratchet grooves at both ends of the rollers 14, so that the rollers 14 can be fixed, the handle 19 is shifted to make the two rollers 14 move toward each other, and finally pushed to the dust suction groove 23, so that the dust on the surface of the scanning flat plate 3 can be pushed into the dust suction groove 23. When the next scanning operation is carried out, the handle 19 is shifted to enable the two rollers 14 to move back and forth, the paper data are flattened and fixed, the piston rod 21 is pulled by the supporting column 11 connected with the piston rod 21, the piston rod 21 slides in the air guide tube 20 and sucks air from the air guide box 22 and the dust suction box 24, due to the downward elastic depression of the air guide plate 25 under the elastic action, dust in the dust suction groove 23 is sucked into the dust suction cavity 26 while air flow enters the dust suction box 24 from the dust suction hole 27 above the air guide plate 25, the air flow can also generate attraction to adsorb the middle part of the paper data on the scanning flat plate 3, the auxiliary rollers 14 are used for flatly laying and fixing the paper data, and the scanning camera 5 can scan the paper data conveniently. When the supporting column 11 stops sliding, the piston rod 21 will also stop sliding, and the air guide plate 25 will return to the initial horizontal state due to the elastic action, and meanwhile, the cylinder plug on the upper surface of the air guide plate 25 will be inserted into the dust suction hole 27 to block the dust suction hole 27, so as to prevent the dust from returning to the scanning flat plate 3 from the dust suction hole 27. When the two rollers 14 move in the opposite direction, the supporting column 11 connected with the piston rod 21 pushes the piston rod 21, the piston rod 21 pushes the air inside the air duct 20 to generate air pressure, and the air flow enters the dust collection box 24 through the air duct box 22, then enters the dust collection cavity 26 through the air duct plate 25, and then enters the external environment through the gap between the dust collection hole 27 and the cylinder on the upper surface of the air duct plate 25. The automatic dust removal mechanism is arranged, so that the roller 14 of the scanner can tile and fix paper data and can remove dust and clean the scanning flat plate 3, and the two kinds of work can be carried out simultaneously and can be mutually promoted.

After using the scanner to accomplish the scanning work, stir handle 19 and push away two cylinders 14 to the intermediate position of scanning flat board 3, it makes it get into the recess that sets up on lifting support 4 completely to rotate scanning camera 5 downwards, then start electronic flexible post 28, electronic flexible post 28 shortens and drives lifting support 4 and descends, lifting support 4's both sides are connected with pin 30, when descending a certain position, the fixture block 31 joint of connecting on pin 30 is on rolling support 12, fix rolling support 12 and prevent to rock about its upper and lower, electronic flexible post 28 stops to shorten this moment, the scanner gets into the inoperative state. Set up folding protection machanism, can make the scanner when out of operation state, protect its scanning camera 5 can not receive the damage, can reduce the space volume of scanner simultaneously, portable rolling support 12 is so that carry the transport to the scanner.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A scanner comprises a support (1), a support plate (2), a scanning flat plate (3), a fixed flat-laying mechanism, an automatic dust removal mechanism and a folding protection mechanism, and is characterized in that the support plate (2) is fixedly connected to the middle of the support (1), the scanning flat plate (3) is fixedly connected to the upper portion of the support (1), the fixed flat-laying mechanism is installed between the scanning flat plate (3) and the support plate (2), the automatic dust removal mechanism is installed on the scanning flat plate (3), and the folding protection mechanism is installed between the scanning flat plate (3) and the support (1) in a sliding manner;

the fixed tiling mechanism comprises a rotating block (6), supporting columns (11), a rolling support (12) and a roller (14), the top of the support plate (2) is rotatably connected with the rotating block (6) at a position close to the center, one end of the top of the rotating block (6) is rotatably connected with a first ejector rod (7), the other end of the top of the rotating block (6) is rotatably connected with a second ejector rod (8), one end of the first ejector rod (7) far away from the rotating block (6) is rotatably connected onto a first sliding table (9), one end of the second ejector rod (8) far away from the rotating block (6) is rotatably connected onto a second sliding table (10), a sliding rod (29) is fixedly connected to the middle part of the support (1) close to the upper part of the support plate (2), the first sliding table (9) and the second sliding table (10) are both slidably connected with the sliding rod (29), the supporting columns (11) are fixedly connected to both ends of the tops of the first sliding table (9) and the second, the upper portions of two support columns (11) located in a first sliding table (9) are close to one side of a second sliding table (10) and one side of the upper portions of two support columns (11) located in the second sliding table (10) close to the first sliding table (9) are all rotatably connected with a rolling support (12), the rolling support (12) is rotatably connected with a roller (14), a support plate (2) and a short side link (16) are passed through the bottom end of a rotating block (6), one end, far away from the rotating block (6), of the short side link (16) is rotatably connected with a connecting rod (17), one end, far away from the short side link (16), of the connecting rod (17) is rotatably connected with a long side link (18), one end, far away from the connecting rod (17), of the long side link (18) is rotatably connected with the bottom of the support plate (2), and the other end of the long side link (18.

2. Scanner according to claim 1, characterized in that said folding protection means comprise an electric telescopic column (28), a lifting column (4), scanning camera (5), fixed mounting has electronic flexible post (28) between first sliding stand 9 and second sliding stand 10 on the lower part platform of support (1), the one end fixedly connected with lift pillar (4) that electronic flexible post (28) are close to extension board (2), lift pillar (4) and extension board (2) sliding connection, the one end that extension board (2) were kept away from in lift pillar (4) is passed scanning flat board (3) and rather than sliding connection, the equal fixedly connected with pin (30) in upper portion both sides of lift pillar (4), pin (30) and one side fixedly connected with fixture block (31) that roll support (12) are relative, the one side rotatable coupling that the upper portion of lift pillar (4) is close to cylinder (14) has scanning camera (5).

3. The scanner according to claim 1, wherein the automatic dust removing mechanism comprises a dust suction groove (23), a dust suction box (24) and a piston rod (21), the dust suction groove (23) is formed between the two rollers (14) at the top of the scanning flat plate (3), the dust suction box (24) is fixedly connected to the bottom of the scanning flat plate (3) below the dust suction groove (23), a plurality of dust suction holes (27) are formed in the dust suction groove (23), the dust suction holes (27) are communicated with the dust suction box (24), an air guide plate (25) is fixedly connected to the position, close to the lower part of the dust suction holes (27), in the dust suction box (24), one end of the air guide box (22) is fixedly connected with the air guide box (22), the air guide box (22) is communicated with the dust suction box (24), one side of the air guide box (22) is fixedly connected with an air guide tube (20), and the air guide tube (20) is communicated with the air guide box (22), the interior sliding connection of air duct (20) has piston rod (21), and the one end fixed connection of keeping away from air duct (20) of piston rod (21) is on support column (11).

4. A scanner according to claim 1, wherein a spring (13) is fixedly mounted between the rolling support (12) and the support column (11), the two ends of the roller (14) are arranged in a ratchet shape, a latch (15) is arranged on the rolling support (12) at the end part close to the roller (14), and the latch (15) can be inserted into a ratchet groove.

5. A scanner according to claim 2, wherein said latch (31) is adapted to be snapped onto the rolling support (12).

6. A scanner according to claim 3, wherein the side of the air guide plate (25) opposite to the dust suction hole (27) is provided with a cylindrical plug adapted to the dust suction hole (27), and the air guide plate (25) is made of an elastic air-permeable material.

7. A scanner according to claim 3, wherein a suction chamber (26) is provided between the air guide plate (25) and the top inner wall of the suction box (24).

8. A scanner according to claim 3, wherein the outer wall of the drum (14) is of a soft fibrous material.