CN113443499A - Automatic paper leveling system - Google Patents
Automatic paper leveling system Download PDFInfo
- Publication number
- CN113443499A CN113443499A CN202110783392.3A CN202110783392A CN113443499A CN 113443499 A CN113443499 A CN 113443499A CN 202110783392 A CN202110783392 A CN 202110783392A CN 113443499 A CN113443499 A CN 113443499A
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- Prior art keywords
- paper
- box body
- placing table
- track
- component
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H31/00—Pile receivers
- B65H31/34—Apparatus for squaring-up piled articles
- B65H31/38—Apparatus for vibrating or knocking the pile during piling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
- B65H43/04—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable detecting, or responding to, presence of faulty articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
- B65H43/08—Photoelectric devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
The invention relates to the technical field of paper production equipment, in particular to an automatic paper flattening system which comprises a box body, wherein a supporting platform is fixedly arranged on the box body, a first track shell is fixedly arranged on one surface, facing the box body, of the supporting platform, a driving wheel set is arranged in the first track shell in a reciprocating sliding mode, a first sliding rod is connected below the driving wheel set, a second track shell is arranged at one end, far away from the first track shell, of the first sliding rod, and a paper drawing and placing component capable of drawing out uneven paper is arranged in the second track shell in a sliding mode; a placing table is arranged in one surface of the box body facing the supporting platform, and a vibrating part is arranged at the lower part of the placing table; the box body is positioned on the outer side of the placing table and is provided with four paper pushing components arranged at an interval of ninety degrees, a gas supply module is arranged in the box body and is used for conveying gas for the vibration component and the paper drawing component.
Description
Technical Field
The invention relates to the technical field of paper production equipment, in particular to an automatic paper leveling system.
Background
In the process that the paper needs to be used in a large number and cut, the length of each paper can be inconsistent, so that the cutting degree of the paper is different when the paper is cut due to the fact that the paper cannot be aligned in the using process, the flat paper cannot be cut into a specified size, and therefore the stacked paper needs to be cut after being manually leveled before work.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an automatic paper leveling system which can stack paper which is not cut in order and then place the paper into a paper cutter for cutting, so that the workload of manual operation is reduced, and the automatic paper leveling system is more convenient to use.
In order to achieve the purpose, the invention adopts the following technical scheme: a paper automatic leveling system comprises a box body, wherein a supporting platform is fixedly arranged on the box body, a first track shell is fixedly arranged on one surface, facing the box body, of the supporting platform, a driving wheel set is arranged in the first track shell in a reciprocating sliding mode, a first sliding rod is connected below the driving wheel set, a second track shell is arranged at one end, away from the first track shell, of the first sliding rod, and a paper drawing and placing component capable of drawing out uneven paper is arranged in the second track shell in a sliding mode; a placing table is arranged in one surface of the box body facing the supporting platform, and a vibrating part is arranged at the lower part of the placing table; the box body is positioned on the outer side of the placing table and is provided with four paper pushing components arranged at an interval of ninety degrees, a gas supply module is arranged in the box body and is used for conveying gas for the vibration component and the paper drawing component.
Preferably, the track of the first track shell is rectangular with round corners, and the track of the second track shell is arranged along the length direction of the second track shell; the supporting platform is fixedly connected with the box body through four supporting columns.
The vibrating part comprises a stepped hole arranged in the middle of the upper end face of the box body, a plurality of positioning rods are arranged on the periphery of the upper end face of the box body, which is located in the stepped hole, positioning groove shells with the same number as the positioning rods are arranged on the lower end face of the placing table, each positioning groove slides on the corresponding positioning rod, and a plurality of first springs are connected between the placing table and the box body.
Preferably, the vibration part further comprises a first motor fixedly arranged on the side edge of the stepped hole, the output end of the first motor extends into the stepped hole, the lower end face of the placing table extends into the columnar extension of the stepped hole, a circular steel plate is fixedly arranged at the lower end of the columnar extension of the placing table, and two limiting plates are symmetrically arranged on the lower end face of the circular steel plate; the output end of the first motor is fixedly provided with a cam, the cam is arranged between the two limiting plates, and the cam is abutted to the lower end face of the circular steel plate.
Preferably, push away the paper part and still lie in the third track casing that the platform outside was equipped with including setting firmly at the box, reciprocating slide is equipped with the rectangle slider in the third track casing, rotatable bracing piece has set firmly in the rectangle slider upper end, rotatable bracing piece upper end has set firmly the installation piece, and the preceding terminal surface middle part of installation piece has set firmly first flexible bracing piece, electric telescopic handle removes the end and rotates to be connected and is equipped with the rectangle thick plate, be equipped with the torsional spring between electric telescopic handle and the rectangle thick plate.
Preferably, a cavity is formed in the placing table, a plurality of vent holes are uniformly distributed in the upper end face, located in the cavity, of the placing table, the opening, far away from the cavity, of each vent hole is arc-shaped, and a ball is arranged in each vent hole.
Preferably, the air supply module comprises an air pump placing groove arranged in the middle of the box body, the air pump placing groove is communicated with the outside, an air pump is installed in the air pump placing groove, an air pipe group is connected to the output end of the air pump, and the air pipe group is communicated to the inside of the cavity.
Preferably, the paper drawing and releasing component further comprises an electric sliding block connected to the second rail in a sliding manner, a second telescopic rod is fixedly arranged at the bottom end of the electric sliding block, a part mounting groove is fixedly formed in a moving end of the second telescopic rod, a roller is rotatably connected in the part mounting groove, and a rolling connecting rod is arranged between the roller and the part mounting groove; the upper end of part mounting groove has set firmly bent shape twisted sheet, another port of bent shape twisted sheet rotates and is connected with the rotatable piece of turning round, bent shape twisted sheet has set firmly the second motor with the stiff end that the rotatable piece of turning round is connected, rotatable piece lower extreme fixedly connected with paper receiving component of turning round, the rear of paper receiving component is the paper storage dish of downward sloping, the middle part rotates before the top of paper receiving component and is connected with small-size running roller, be equipped with the roll bar between small-size running roller and the paper receiving component.
Preferably, the middle part of the first sliding rod is fixedly connected with an annular gas pipe frame; the output of air pump is connected with the trachea, the trachea passes the annular trachea support at support column and first slide bar middle part through the box and links to each other with two gas pocket installation pieces on the part mounting groove, the upper and lower both ends of the preceding terminal surface of gas pocket installation piece have set firmly two air vents.
Has the advantages that: compared with the prior art, the invention has the following improvements
1. Through the cooperation of placing platform and vibration part, can carry out preliminary flattening earlier with the paper pile that has mixed and disorderly appearance, the air supply module can also follow the air-out of paper bottom simultaneously for paper shake flattening process is more laborsaving, high-efficient.
2. After the paper is leveled, the paper drawing and releasing component can draw out the single paper which can not be leveled into the paper stack or the residual paper which is larger than the normal paper and is placed at the top of the paper stack.
3. When the paper drawing component draws paper, the air supply module can further supply air to the upper side and the lower side of the paper to be drawn, so that the friction force between the paper to be drawn and the upper paper and the lower paper is reduced, and the paper drawing is smoother.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 5 is a cross-sectional view taken at B-B of FIG. 3;
FIG. 6 is an enlarged view of a portion of FIG. 4 at C;
fig. 7 is a cross-sectional view at D in fig. 4.
In the figure: the paper feeding device comprises a box body 4, a supporting platform 1, a first track shell 103, a driving wheel set 104, a first sliding rod 106, a second track shell 130, a placing table 3, a paper pushing component 2, a supporting column 111, a stepped hole 301, a positioning rod 308, a first spring 307, a first motor 306, a round steel plate 303, a limiting plate 305, a cam 302, a third track shell 205, a rectangular sliding block 206, a rotatable supporting rod 204, a mounting block 203, a first telescopic supporting rod 202, a rectangular thick plate 201, a cavity 309, an air vent 311, a ball 310, an air pump 313, an air pipe set 401, the cavity 309, a paper feeding component 1, an electric sliding block 109, a second telescopic rod 110, a part mounting groove 112, a roller 113, a curved twisted piece 120, a rotatable twisted piece 121, a second motor 123, a small roller 115, an annular air pipe frame 107, an air pipe 402, an air hole mounting block 118 and two air outlet holes 122.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
In the description of the present invention, it should be noted that the terms "inside", "below", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally place when used, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
With reference to fig. 1-6, an automatic paper leveling system includes a box 4, a supporting platform 1 is fixedly disposed on the box 4, a first rail housing 103 is fixedly disposed on a surface of the supporting platform 1 facing the box 4, a driving wheel set 104 is disposed in the first rail housing 103 in a reciprocating sliding manner, a first sliding rod 106 is connected below the driving wheel set 104, a second rail housing 130 is disposed at one end of the first sliding rod 106 far away from the first rail housing 103, and a paper drawing and placing component capable of drawing out uneven paper is slidably disposed in the second rail housing 130; a placing table 3 is arranged in one surface of the box body facing the supporting platform 1, and a vibrating part is arranged at the lower part of the placing table 3; four paper pushing components 2 arranged at an interval of ninety degrees are arranged on the outer side of the placing platform 3 of the box body 4, and an air supply module is arranged in the box body 4 and used for supplying air to the vibration component and the paper drawing component.
Preferably, the track of the first track housing 103 is rectangular with rounded corners, and the track of the second track housing 130 is arranged along the length direction of the second track housing 130; the supporting platform is fixedly connected with the box body 4 through four supporting columns 111.
Preferably, the vibration part includes the shoulder hole 301 that sets up in the middle part of the up end of box 4, and the up end of box 4 is located the shoulder hole and is equipped with a plurality of locating levers 308 all around, places platform 3 lower terminal surface and is equipped with the constant head tank casing the same with locating lever 308 quantity, and every constant head tank slides on the locating lever 308 that corresponds, places and is connected with a plurality of first springs 307 between platform 3 and the box 4.
Preferably, the vibration part further comprises a first motor 306 fixedly arranged on the side edge of the stepped hole 301, the output end of the first motor 306 extends into the stepped hole 301, the lower end face of the placing table 3 extends into the columnar extension of the stepped hole 301, a circular steel plate 303 is fixedly arranged at the lower end of the columnar extension of the placing table 3, and two limiting plates 305 are symmetrically arranged on the lower end face of the circular steel plate 303; the output end of the first motor 306 is fixedly provided with a cam 302, the cam 302 is arranged between two limit plates 305, and the cam 302 is abutted against the lower end face of the circular steel plate 303.
Preferably, the paper pushing component 2 further comprises a third rail housing 205 fixedly arranged on the box body 4 and located outside the placing table 3, a rectangular sliding block 206 is arranged in the third rail housing 205 in a reciprocating sliding mode, a rotatable supporting rod 204 is fixedly arranged at the upper end of the rectangular sliding block 206, an installing block 203 is fixedly arranged at the upper end of the rotatable supporting rod 204, a first telescopic supporting rod 202 is fixedly arranged in the middle of the front end face of the installing block 203, the moving end of the electric telescopic rod 202 is rotatably connected with a rectangular thick plate 201, and a torsion spring is arranged between the electric telescopic rod and the rectangular thick plate.
Preferably, a cavity 309 is formed in the placing table 3, a plurality of vent holes 311 are uniformly distributed on the upper end surface of the placing table 3, which is located in the cavity 309, the opening of the vent hole 311, which is far away from the cavity 309, is arc-shaped, and a ball 310 is arranged in the vent hole 311.
Preferably, the air supply module comprises an air pump accommodating groove arranged in the middle of the box body 4, the air pump accommodating groove is communicated with the outside, an air pump 313 is arranged in the air pump accommodating groove, an output end of the air pump 313 is connected with an air pipe group 401, and the air pipe group 401 is communicated into the cavity 309.
Preferably, the paper drawing and releasing component 1 further comprises an electric slider 109 slidably connected to the second rail, a second telescopic rod 110 is fixedly arranged at the bottom end of the electric slider 109, a part mounting groove 112 is fixedly arranged at the moving end of the second telescopic rod, a roller 113 is rotatably connected in the part mounting groove 112, and a rolling connecting rod is arranged between the roller 113 and the part mounting groove 112; the upper end of part mounting groove 112 sets firmly curved twisted piece 120, another port of curved twisted piece 120 rotates and is connected with rotatable piece 121 of turning round, the stiff end that curved twisted piece 120 and rotatable piece 121 of turning round are connected sets firmly second motor 123, rotatable piece 121 lower extreme fixedly connected with paper receiving element 114 that turns round, the paper storage disc of downward sloping is held for the rear of paper receiving element 114, middle part is rotated and is connected with small-size running roller 115 before the top of paper receiving element 114, be equipped with the rolling rod between small-size running roller 115 and the paper receiving element 114. The roller 113 is connected with a driving module capable of rotating the roller 113, and the rotation of the roller 113 by the driving module is a common prior art and is not described herein.
Preferably, the middle part of the first sliding rod 106 is fixedly connected with an annular gas tube rack 107; the output end of the air pump 313 is connected with an air pipe 402, the air pipe passes through the support column 111 and the annular air pipe frame 107 in the middle of the first sliding rod 107 through the box body 4 and is connected with the two air hole installation blocks 118 on the part installation groove 112, and the upper end and the lower end of the front end face of each air hole installation block 118 are fixedly provided with two air holes 122.
The working principle is as follows:
when starting the power, push away paper part 2 and vibration part simultaneous working, push away paper part 2 during operation, rotatable bracing piece 204 is rotatory to the paper of orientation and is placed platform 3 with the front of installing piece 203, and simultaneously, rectangle slider 206 removes to placing 3 directions of platform, and the paper edge is laminated to the rectangle thick plate 201 bottom of inclining, slowly presses close to the paper when vibrating, and the rectangle thick plate 201 of slope slowly vertically slowly pushes away the paper all around smoothly afterwards. After the vibration is finished, the mounting block 203 is rotated away from the placement table 3 by the rotatable support rod 204, and simultaneously moved in the opposite direction to the boundary of the third rail housing 205 toward the placement table 3 by the rectangular slider 206 on the third rail housing 205.
The cam 302 starts to rotate, the circular steel plate 303 abutted to the cam 302 and the plurality of positioning rods 308 are driven to reciprocate up and down, and the circular steel plate 303 and the plurality of positioning rods 308 reciprocate up and down to drive the placing table 3 to reciprocate up and down to drive the paper on the placing table to start to vibrate.
The cavity 309 is connected with an air pump 313 in an air pump placing groove in the box body 4, when the air pump 313 is started, air is transmitted to the cavity 309 in the placing table 3 through the air pipe group 401 and is transmitted to each vent hole 311 through the cavity 309, so that the balls 310 float upwards, the floating balls 310 are subjected to pressure reduction due to the weight of paper, the air in the vent holes 311 is dispersed out of the holes to form an air layer with the bottom of the paper, the friction between the paper and the placing table 3 is reduced, and the paper can be conveniently moved and leveled.
After the vibration leveling is finished, according to the feedback of the infrared distance measuring device, the paper which is not integrated into the paper stack by the vibration component is drawn out, the driving wheel set 104 in the first rail shell 103 and the electric slider 109 in the second rail shell 130 move to move the second telescopic rod 110 to one side of the protruding end of the paper which needs to be drawn out, after the second telescopic rod 110 is aligned to the appointed position, the roller 113 in the part mounting groove 112 on the moving end of the second telescopic rod contacts with the paper, meanwhile, the rotating button block 121 in the paper receiving component 114 drives the paper receiving component 114 to rotate, so that the front end of the paper receiving component contacts with the roller 113 to clamp the paper, meanwhile, the air outlet holes 122 on two sides of the paper receiving component 114 supply air to the upper and lower sides of the paper which needs to be drawn out, so that an air layer is generated between the upper and lower sides of the paper which is to be drawn out and the stacked paper stack, the friction between the paper and the paper stack is reduced, the paper is convenient to draw out, meanwhile, the roller 113 on the installation rod is driven by the driving module to start rotating, the paper is slowly drawn out in a rotating mode, and the drawn paper can be placed on the paper storage disc in the paper receiving component 114.
Until the infrared distance measuring device no longer detects uneven paper, at this time, the second telescopic rod 110 is lifted, the electric slider 109 in the second rail housing 106 is moved to the boundary position of the paper stacked on the paper placing table 3, the rotating knob 121 on the paper receiving part 114 is rotated, the paper in the paper storage tray in the paper receiving part 114 is slid into the uppermost end of the paper stacked on the paper placing table 3, and after the completion, each device returns to the original position.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The automatic paper flattening system comprises a box body (4) and is characterized in that a supporting platform (1) is fixedly arranged on the box body (4), a first track shell (103) is fixedly arranged on one surface, facing the box body (4), of the supporting platform (1), a driving wheel set (104) is arranged in the first track shell (103) in a reciprocating sliding mode, a first sliding rod (106) is connected below the driving wheel set (104), a second track shell (130) is arranged at one end, away from the first track shell (103), of the first sliding rod (106), and a paper drawing and placing component capable of drawing out uneven paper is arranged in the second track shell (130) in a sliding mode; a placing table (3) is arranged in one surface of the box body facing the supporting platform (1), and a vibrating part is arranged at the lower part of the placing table (3); the paper-pushing device is characterized in that four paper-pushing components (2) arranged at ninety-degree intervals are arranged on the outer side of the placing table (3) of the box body (4), an air supply module is arranged in the box body (4), and the air supply module supplies air for the vibration component and the paper-pulling component.
2. The automated sheet flattening system of claim 1, wherein the track of said first track housing (103) is rectangular with rounded corners and the track of said second track housing (130) is disposed along the length of said second track housing (130); the supporting platform is fixedly connected with the box body (4) through four supporting columns (111).
3. The automatic paper flattening system of claim 1, characterized in that the vibrating component comprises a stepped hole (301) arranged in the middle of the upper end face of the box body (4), a plurality of positioning rods (308) are arranged on the upper end face of the box body (4) around the stepped hole, positioning groove housings with the same number as the positioning rods (308) are arranged on the lower end face of the placing table (3), each positioning groove slides on the corresponding positioning rod (308), and a plurality of first springs (307) are connected between the placing table (3) and the box body (4).
4. The automatic paper flattening system of claim 3, characterized in that the vibrating component further comprises a first motor (306) fixedly arranged at the side of the stepped hole (301), the output end of the first motor (306) extends into the stepped hole (301), the lower end surface of the placing table (3) extends into the columnar extension of the stepped hole (301), the lower end of the columnar extension of the placing table (3) is fixedly provided with a circular steel plate (303), and the lower end surface of the circular steel plate (303) is symmetrically provided with two limiting plates (305); the output end of the first motor (306) is fixedly provided with a cam (302), the cam (302) is arranged between the two limiting plates (305), and the cam (302) is abutted to the lower end face of the circular steel plate (303).
5. The automatic paper flattening system according to claim 4, characterized in that the paper pushing component (2) further comprises a third rail housing (205) fixedly arranged on the box body (4) and located outside the placing table (3), a rectangular sliding block (206) is arranged in the third rail housing (205) in a reciprocating sliding manner, a rotatable supporting rod (204) is fixedly arranged at the upper end of the rectangular sliding block (206), a mounting block (203) is fixedly arranged at the upper end of the rotatable supporting rod (204), a first telescopic supporting rod (202) is fixedly arranged in the middle of the front end face of the mounting block (203), a rectangular thick plate (201) is rotatably connected to the moving end of the electric telescopic rod (202), and a torsion spring is arranged between the electric telescopic rod and the rectangular thick plate.
6. The automatic paper flattening system according to claim 5, characterized in that a cavity (309) is arranged in the placing table (3), a plurality of vent holes (311) are uniformly distributed on the upper end face of the placing table (3) located in the cavity (309), the opening of the vent holes (311) far away from the cavity (309) is arranged in a circular arc shape, and balls (310) are arranged in the vent holes (311).
7. The automatic paper flattening system of claim 6, characterized in that the air supply module comprises an air pump installation groove arranged in the middle of the box body (4), the air pump installation groove is communicated with the outside, an air pump (313) is installed in the air pump installation groove, an air pipe group (401) is connected to the output end of the air pump (313), and the air pipe group (401) is communicated into the cavity (309).
8. The automatic paper flattening system according to claim 1, characterized in that the drawing and placing component (1) further comprises an electric slider (109) slidably connected to the second rail, a second telescopic rod (110) is fixedly arranged at the bottom end of the electric slider (109), a part mounting groove (112) is fixedly arranged at the moving end of the second telescopic rod, a roller (113) is rotatably connected to the part mounting groove (112), and a rolling connecting rod is arranged between the roller (113) and the part mounting groove (112); the upper end of part mounting groove (112) has set firmly bent shape twisted sheet (120), another port of bent shape twisted sheet (120) rotates and is connected with rotatable piece (121) of turning round, bent shape twisted sheet (120) and the stiff end that rotatable piece (121) of turning round are connected have set firmly second motor (123), rotatable piece (121) lower extreme fixedly connected with paper receiving component (114) of turning round, the rear of paper receiving component (114) is the paper storage dish of downward sloping, the top front middle part of paper receiving component (114) rotates and is connected with small-size running roller (115), be equipped with the roll bar between small-size running roller (115) and paper receiving component (114).
9. An automated paper flattening system according to claim 1, characterized in that an annular air tube frame (107) is fixedly connected to the middle of said first slide bar (106); the output of air pump (313) is connected with trachea (402), the trachea passes annular trachea frame (107) at support column (111) and first slide bar (107) middle part through box (4) and links to each other with two gas vent installation pieces (118) on part mounting groove (112), the upper and lower both ends of the preceding terminal surface of gas vent installation piece (118) have set firmly two air vents (122).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110783392.3A CN113443499B (en) | 2021-07-12 | 2021-07-12 | Automatic paper leveling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110783392.3A CN113443499B (en) | 2021-07-12 | 2021-07-12 | Automatic paper leveling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113443499A true CN113443499A (en) | 2021-09-28 |
| CN113443499B CN113443499B (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110783392.3A Active CN113443499B (en) | 2021-07-12 | 2021-07-12 | Automatic paper leveling system |
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| CN (1) | CN113443499B (en) |
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| CN113443499B (en) | 2022-08-19 |
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