A paper clamping device

Abstract

The patent discloses a paper clamping device, including a rotating shaft and a base, the paper is clamped by the rotating shaft, the rotating shaft is fixed on one side of the base, the rotating shaft includes a semicircular unit, the end face of the semicircular unit is arranged with a protruding buckle, the base includes a buckle positioning column, the buckle positioning column is arranged away from the rotating shaft, the protruding buckle and the buckle positioning column are movably connected to form an arch bridge shape, the semicircular unit and the buckle positioning column are made of elastic plastic material, and the semicircular unit and the buckle positioning column can be disconnected through elastic action. The rotating shaft is designed as an arch bridge shape, can be dispersed to both ends when being pressed, so that being pressed is avoided, and the arch bridge shape enables the user to be more smooth and not jammed when turning the page, the patent structure is simple, the cooperation and connection degree of various components are better, and the manufacturing cost of the plastic material is relatively low.

Description

Technical Field

[0001] This patent relates to the field of stationery technology, and in particular to a paper clamping device. Background Technology

[0002] Currently, most paper holding devices in loose-leaf notebooks are made of metal parts. With many internal components, the parts may be defective or burr-like if the stamping process is not handled carefully, which can easily cause hand injuries. Therefore, the quality control requirements are very high, which increases the manufacturing cost of the parts.

[0003] Replacing metal parts with plastic parts not only avoids the aforementioned problems but also reduces manufacturing costs. However, existing paper clamping devices are mainly circular, with both ends fixed to the center of the circle. Using plastic parts in a circular structure makes the clamping device prone to damage under pressure. Utility Model Content

[0004] The purpose of this patent is to provide a paper clamping device that avoids the easy damage of plastic clamping devices.

[0005] To solve the above-mentioned technical problems, this patent adopts the following technical solution:

[0006] A paper clamping device includes a rotating shaft and a base. The paper is clamped by the rotating shaft, which is fixed to one side of the base. The rotating shaft includes a semi-circular unit with a protruding buckle arranged on the end face of the semi-circular unit. The base includes a buckle positioning post, which is arranged away from the rotating shaft. The protruding buckle and the buckle positioning post are movably connected to form an arch bridge shape. The semi-circular unit and the buckle positioning post are made of elastic plastic material, and the semi-circular unit and the buckle positioning post can be disengaged through elasticity.

[0007] Furthermore, the semi-arc element includes a first semi-arc element and a second semi-arc element.

[0008] Furthermore, the latching positioning post includes a first latching positioning post and a second latching positioning post.

[0009] Furthermore, the first semi-circular unit is movably connected to the first snap-fit ​​positioning post, and the second semi-circular unit is movably connected to the second snap-fit ​​positioning post.

[0010] Furthermore, the protruding latch of the first semi-circular unit is arranged on the side away from the second semi-circular unit;

[0011] Furthermore, the protruding latch of the second semi-circular unit is positioned on the side away from the first semi-circular unit.

[0012] Furthermore, both the hinge and the base are made of flexible plastic material.

[0013] Furthermore, the rotating shaft also includes a rotation axis, with one end of the first and second semi-circular units fixed to the rotation axis.

[0014] Furthermore, the base includes a pivot receiving groove and a base plane, the pivot receiving groove being arranged on the side of the base plane, and the rotating shaft being fixed in the pivot receiving groove;

[0015] Furthermore, the rotating shaft receiving groove is provided with a first alignment groove and a second alignment groove, the first semi-circular unit is at least partially received in the first alignment groove, and the second semi-circular unit is at least partially received in the second alignment groove.

[0016] Furthermore, the two ends of the rotating shaft are provided with large cylinders and U-shaped elastic buckles, which are formed by material reduction design;

[0017] Furthermore, the rotating shaft receiving groove is equipped with a rotating shaft fixing mechanism and an elastic snap-lock fixing groove.

[0018] Furthermore, the rotating shaft fixing mechanism is positioned close to the large cylinder.

[0019] Furthermore, the elastic buckle fixing groove includes a stepped buckle, and the U-shaped elastic buckle is embedded in the stepped buckle for fixing.

[0020] Furthermore, the rotating shaft fixing mechanism includes a triangular boss and a U-shaped gate.

[0021] Furthermore, the rotating shaft is fixed in the rotating shaft receiving groove by an interference fit with the triangular boss;

[0022] Furthermore, the large cylinder includes the front end face of the cylinder and the side face of the cylinder;

[0023] Furthermore, the front end of the cylinder abuts against the U-shaped door;

[0024] Furthermore, the base plane includes a cylindrical side abutment surface, and the side of the cylinder is connected to the cylindrical side abutment surface.

[0025] Furthermore, the rotating shaft includes a first inner groove and a second inner groove;

[0026] Furthermore, the first embedded groove and the second embedded groove are arranged between the first semi-circular unit and the second semi-circular unit.

[0027] Furthermore, the base plane includes a rivet hole embedded platform, in which a first rivet hole and a second rivet hole are provided, and the first rivet hole and the second rivet hole are arranged opposite each other in the axial direction.

[0028] Furthermore, a protruding latch is set in the latching platform.

[0029] Furthermore, the area around the buckle platform is connected to the buckle arc abutting surface, the buckle inclined surface, the buckle flat surface, the inner abutting surface of the buckle arc, and the buckle sliding transition surface.

[0030] Furthermore, the protruding buckle is embedded into the buckle positioning post for connection, and the buckle platform abuts against the inside of the buckle positioning post.

[0031] Furthermore, the snap-fit ​​positioning post includes a multi-faceted inner groove, which is set on the inner groove platform;

[0032] Furthermore, the inner groove platform is connected to the positioning arc abutment surface, positioning abutment slope surface, positioning abutment plane, positioning arc inner abutment surface and positioning receiving transition surface respectively;

[0033] Furthermore, the protruding buckle is fixed in the polygonal inner groove so that the inner groove platform and the buckle platform abut against each other, thereby forming an arch bridge shape.

[0034] Furthermore, the semi-circular unit includes a cylindrical straight section, which is arranged parallel to the snap-fit ​​positioning post.

[0035] This patent provides a paper clamping device. By designing the rotating shaft in an arch shape, the pressure can be distributed to both ends, thus preventing it from being crushed. The arch shape also allows users to turn pages more smoothly and without jamming. This patent has a simple structure, good connection between the various components, and relatively low manufacturing cost of plastic materials. Attached Figure Description

[0036] The above content of this patent and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0037] Figure 1 This is a schematic diagram of the structure of a paper clamping device in the prior art;

[0038] Figure 2 This is a schematic diagram of the paper clamping device in this patent.

[0039] Figure 3 This is a structural schematic diagram of the paper clamping device from another angle in this patent;

[0040] Figure 4 This is an exploded view of the paper clamping device in this patent;

[0041] Figure 5 This is a schematic diagram of the structure of the rotating shaft in this patent;

[0042] Figure 6 yes Figure 5 Side view of the middle section structure;

[0043] Figure 7This is a schematic diagram of the structure of the second semi-circular unit in this patent;

[0044] Figure 8 This is a partial structural schematic diagram of the second semi-circular unit in this patent;

[0045] Figure 9 This is a schematic diagram of the base structure in this patent;

[0046] Figure 10 This is a structural schematic diagram of the base from another angle in this patent;

[0047] Figure 11 This is a schematic diagram of the location of the rotating shaft receiving groove in this patent;

[0048] Figure 12 This is a schematic diagram of the stepped buckle structure in this patent;

[0049] Figure 13 This is a schematic diagram of the structure of the second snap-fit ​​positioning post in this patent.

[0050] The reference numerals in the attached figures are explained as follows:

[0051] Activity Interface: 100

[0052] Shaft: 1

[0053] First semi-circular unit: 11

[0054] First cylindrical straight section: 111 First protruding buckle: 112

[0055] Second semi-circular unit: 12

[0056] Second cylindrical straight section: 121 Second protruding buckle: 122 Buckle platform: 123 Buckle arc section abutting surface: 1231 Buckle abutting inclined surface: 1232 Buckle abutting flat surface: 1233 Buckle arc section inner abutting surface: 1234 Buckle sliding transition surface: 124 Large cylinder: 13 Cylinder front end face: 131 Cylinder side side: 132 Rotation axis: 14

[0057] First recessed slot: 141

[0058] Second recessed groove: 142 U-shaped elastic buckle: 15 Base: 2

[0059] Rotary shaft fixing mechanism: 21 Triangular boss: 211 U-shaped door: 212

[0060] First alignment slot: 22

[0061] Second alignment slot: 23

[0062] First buckle positioning post: 24

[0063] Second snap-fit ​​positioning post: 25 multi-faceted inner groove: 251

[0064] Inner groove platform: 252 positioning arc segment abutting surface: 2521 positioning abutting inclined surface: 2522

[0065] Positioning against the plane: 2523

[0066] Inner contact surface of the positioning arc segment: 2524

[0067] Positioning and transition surface: 253

[0068] Elastic buckle fixing slot: 26

[0069] Step-locking buckle: 261

[0070] Base plane: 27

[0071] Rivet hole embedded platform: 271

[0072] First rivet hole: 2711

[0073] Second rivet hole: 2712

[0074] Cylindrical side abutment surface: 272

[0075] Shaft receiving groove: 28 Detailed Implementation

[0076] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0077] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0078] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0079] All other terms used herein, unless otherwise defined in this patent, are intended to have the general meaning understood by one of ordinary skill in the art, and in particular, meaning that one of ordinary skill in the art, upon reading the claims, specification, and drawings of this patent, can directly and unambiguously determine how the technical solution of this patent can be implemented. One of ordinary skill in the art would first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, one would choose to refer to relevant definitions in other documents published by the applicant prior to the filing date to reasonably interpret the terms; thirdly, one would choose to refer to the references cited in this patent to reasonably interpret the terms; and finally, one would choose to refer to technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc., commonly used by one of ordinary skill in the art to reasonably interpret the terms.

[0080] All references cited in this application are incorporated herein by way of quotation, to the extent that they do not contradict the disclosure herein. It will be apparent to those skilled in the art that products (apparatus, components, devices, compounds, compositions, materials, etc.) and methods (processes, steps, conditions, parameters, equipment, and test methods, equipment, etc.) not specifically described herein can be applied to the implementation of the patents fully disclosed herein without the need for excessive experimentation. This patent is intended to cover all functional equivalents known in the art of the methods, apparatus, apparatus components, materials, processes, and techniques specifically described herein. All cited references include:

[0081] The following publications are included: Marks' Standard Handbook for Mechanical Engineers (11th edition and other editions prior to the filing date of this application), published by McGraw-Hill, Inc.; DeGarmo's Materials and Processes in Manufacturing (13th edition and other editions prior to the filing date of this application), published by Wiley; Oberg's Handbook (32nd edition and other editions prior to the filing date of this application), published by IndustrialPress Inc.; Cheng Daxian's Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), published by Chemical Industry Press; and Wen Bangchun's Modern Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), published by Machinery Industry Press.

[0082] To make the objectives, technical solutions, and advantages of this patent clearer, the embodiments of this patent will be described in further detail below with reference to the accompanying drawings.

[0083] like Figure 1 As shown, commonly used paper clamping devices in the prior art are ring-shaped, with the movable interface 100 often located at the top center. When using metal materials, it is difficult to achieve a smooth and seamless connection of the movable interface 100, with a small portion exposed on the outer surface. This can easily cause scratches to the user's hand when flipping the paper, and it can also cause the paper to jam or even damage its flatness. Currently, there are also existing technologies using clamping devices made of plastic materials. For example, EP0946372B1 mentions that the flat ring rail preferably has ten to fifteen cast closed rings, which are made of plastic as a single injection-molded part along with the ring rail. Using plastic parts instead of metal parts not only reduces manufacturing costs, but also, due to their elastic properties, provides a relatively better smooth and seamless connection between the components. However, the rigidity of plastic parts is not as high as that of metal parts, and they are easily damaged under stress when manufactured into a ring-shaped structure.

[0084] like Figure 2-13 The specific embodiment of this patent shown includes a paper clamping device, comprising a rotating shaft 1 and a base 2. The paper is clamped by the rotating shaft 1, which is fixed to one side of the base 2. The rotating shaft 1 includes a semi-circular unit with a protruding buckle arranged on the end face of the semi-circular unit. The base 2 includes a buckle positioning post, which is arranged away from the rotating shaft 1. The protruding buckle and the buckle positioning post are movably connected to form an arch bridge shape. The semi-circular unit and the buckle positioning post are made of elastic plastic material, which can be used to release the connection between the semi-circular unit and the buckle positioning post through elasticity.

[0085] In one embodiment, the semi-circular unit includes a cylindrical straight section, which is arranged parallel to the snap-fit ​​positioning post.

[0086] This patent aims to provide a two-hole binder clamp as a holding device, consisting of a base 2 and a rotating shaft 1. It is commonly used in loose-leaf notebooks to facilitate adding, replacing, or removing pages. The base 2 and rotating shaft 1 are connected by two "arch bridges," with symmetrical left and right arcs. The cylindrical sections extending from the bottom of the base 2 and rotating shaft 1, and the locking positioning posts, have different diameters (approximately 1.25 times). The extension of the posts on the base 2 is a gradual process, gradually connecting with the extended posts of the rotating shaft 1. The middle bridge section is shaped like a "D" with a curved top. When pressure is applied, the pressure is distributed to the cylindrical sections and locking positioning posts, thereby reducing the force on the top of the semi-circular unit. This patented clamping device is more stress-resistant than traditional circular structures.

[0087] In one embodiment, the semi-arc unit includes a first semi-arc unit 11 and a second semi-arc unit 12, wherein the first semi-arc unit 11 and the second semi-arc unit 12 are symmetrically arranged with the same structure.

[0088] In one specific embodiment, the snap-fit ​​positioning post includes a first snap-fit ​​positioning post 24 and a second snap-fit ​​positioning post 25, and the first snap-fit ​​positioning post 24 and the second snap-fit ​​positioning post 25 are symmetrically arranged with the same structure.

[0089] In one specific embodiment, the first semi-circular unit 11 is movably connected to the first snap-fit ​​positioning post 24, and the second semi-circular unit 12 is movably connected to the second snap-fit ​​positioning post 25. The first protruding snap 112 of the first semi-circular unit 11 is arranged on the side away from the second semi-circular unit 12; the second protruding snap 122 of the second semi-circular unit 12 is arranged on the side away from the first semi-circular unit 11. In use, the user can hook the first semi-circular unit 11 and the second semi-circular unit 12 with their thumb and forefinger respectively to pinch them together, so that the first protruding snap 112 and the first snap-fit ​​positioning post 24 are disconnected, and at the same time the second semi-circular unit 12 and the second snap-fit ​​positioning post 25 are disconnected. In this way, the number of sheets of paper can be added, replaced, or removed from the clamping device.

[0090] In one specific embodiment, the cylindrical straight section includes a first cylindrical straight section 111 and a second cylindrical straight section 121. The first cylindrical straight section 111 can be connected to a first protruding buckle 112 through the arc portion at the top of the first semi-arc unit 11, and the second cylindrical straight section 121 can be connected to a second protruding buckle 122 through the arc portion at the top of the second semi-arc unit 12 of the rotating shaft 1.

[0091] In one embodiment, both the rotating shaft 1 and the base 2 are made of elastic plastic material. The rotating shaft 1 further includes a rotating shaft 14, with one end of the first semi-circular unit 11 and the second semi-circular unit 12 fixed to the rotating shaft 14. The base 2 includes a rotating shaft receiving groove 28 and a base plane 27. The rotating shaft receiving groove 28 is arranged on the side of the base plane 27, and the rotating shaft 14 is fixed in the rotating shaft receiving groove 28. The rotating shaft receiving groove 28 is provided with a first alignment groove 22 and a second alignment groove 23. The first semi-circular unit 11 is at least partially received in the first alignment groove 22, and the second semi-circular unit 12 is at least partially received in the second alignment groove 23. The alignment grooves on the base 2 are used to control the gap of the cylindrical straight section on the rotating shaft, effectively controlling the gap distance and preventing deviation when opening and rotating or large misalignment when closing. Specifically, the first cylindrical straight section 111 is received in the first alignment groove 22, and the second cylindrical straight section 121 is received in the second alignment groove 23.

[0092] In one embodiment, the rotating shaft 14 has large cylinders 13 and U-shaped elastic buckles 15 at both ends, the U-shaped elastic buckles 15 being formed by a subtractive material design; the rotating shaft receiving groove 28 has a rotating shaft fixing mechanism 21 and an elastic buckle fixing groove 26, the rotating shaft fixing mechanism 21 being positioned close to the large cylinders 13, and the elastic buckle fixing groove 26 including a stepped buckle 261, the U-shaped elastic buckle 15 being embedded and fixed in the stepped buckle 261. The rotating shaft 14 is inserted into the elastic buckle fixing groove 26 on the base 2 and passes through the stepped buckle 261, at which point the end of the U-shaped elastic buckle 15 is assembled and fixed onto the base 2.

[0093] In one embodiment, the rotating shaft fixing mechanism 21 includes a triangular boss 211 and a U-shaped gate 212, and the rotating shaft 14 is fixed in the rotating shaft receiving groove 28 by interference fit with the triangular boss 211.

[0094] In one specific embodiment, the large cylinder 13 includes a front end face 131 and a side face 132; the front end face 131 abuts against the U-shaped door 212, serving as a limit for the insertion depth; the base plane 27 includes a side abutment surface 272, and the side face 132 is connected to the side abutment surface 272. The surfaces of the large cylinder 13 and the rotating shaft 14 form a left-right mating relationship, adding a fit to this side of the rotating shaft 13, preventing this side from being unfixed and affecting the firmness of the fit between the rotating shaft 1 and the base 2.

[0095] In one embodiment, the rotating shaft 14 includes a first recessed groove 141 and a second recessed groove 142; the first recessed groove 141 and the second recessed groove 142 are arranged between the first semi-circular unit 11 and the second semi-circular unit 12. Specifically, the first recessed groove 141 and the second recessed groove 142 provide space for removing the rotating shaft 14 in the rotating shaft receiving groove 28. When the rotating shaft 1 is fixed on the base 2, the rotating shaft 14 can be pulled downward along the axial direction of the first cylindrical straight section 111 by inserting a tool into the first recessed groove 141 and the second recessed groove 142. At this time, the triangular boss 211 near the end of the large cylinder 13 of the rotating shaft 14 is first disconnected from the rotating shaft 14, and the first cylindrical straight section 111 moves downward, disengaging the first cylindrical straight section 111 and the second cylindrical straight section 121 from the first alignment groove 22 and the second alignment groove 23, respectively. Then, by applying further force at the length position of the rotating shaft 14, the U-shaped elastic buckle 15 can be disengaged from the elastic buckle fixing groove 26. In this way, the rotating shaft 1 can be completely separated from the base 2. The clamping device of this patent is convenient to install and separate, and further improves the recycling rate.

[0096] In one embodiment, the base plane 27 includes a rivet hole embedding platform 271, in which a first rivet hole 2711 and a second rivet hole 2712 are provided, and the first rivet hole 2711 and the second rivet hole 2712 are arranged opposite to each other in the axial direction. The first rivet hole 2711 and the second rivet hole 2712 facilitate nailing onto the plate for use. The upper surface of the rivet hole embedding platform 271 is lower than the base plane 27 to prevent the rivet head from being higher than the base plane 27 after being pressed, which would cause paper scraping.

[0097] In one embodiment, the rotating shaft 1 is further provided with symmetrical protruding buckles on both sides (outer side), which cooperate with the symmetrical grooved buckles on both sides (inner side) of the base 2. Abutting plane and abutting slope are provided between them. The abutting plane ensures that the buckles are aligned and engaged after the rotating shaft 1 is rotated to its final position. The abutting slope and transition surface control the "arch bridge" to prevent excessive downward pressure from causing the buckles to deform and detach, thus providing a force-holding effect. Specifically, the protruding buckles are disposed in the buckling platform 123. Around the buckling platform 123, there are respectively connected buckle arc abutting surface 1231, buckle abutting slope 1232, buckle abutting plane 1233, buckle arc inner abutting surface 1234, and buckle sliding transition surface 124. The protruding buckles are embedded in the buckle positioning post for connection, and the buckle platform 123 abuts against the inside of the buckle positioning post.

[0098] In one specific embodiment, the snap-fit ​​positioning post includes a multi-faceted inner groove 251, which is disposed on an inner groove platform 252. The inner groove platform 252 is surrounded by a positioning arc segment abutment surface 2521, a positioning abutment inclined surface 2522, a positioning abutment plane 2523, a positioning arc segment inner abutment surface 2524, and a positioning receiving transition surface 253. The protruding snap-fit ​​is fixed in the multi-faceted inner groove 251 so that the inner groove platform 252 and the snap-fit ​​platform 123 abut against each other, thereby forming an arch bridge shape. Among them, the buckle arc abutting surface 1231 is connected to the positioning arc abutting surface 2521, the buckle abutting inclined surface 1232 is connected to the positioning abutting inclined surface 2522, the buckle abutting plane 1233 is connected to the positioning abutting plane 2523, the buckle arc inner abutting surface 1234 is connected to the positioning arc inner abutting surface 2524, and the buckle sliding transition surface 124 is connected to the positioning receiving transition surface 253. Therefore, the connection position between the protruding buckle and the buckle positioning post is semi-arc.

[0099] The terminology and expressions used herein are for descriptive purposes only and this patent should not be limited to them. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various possible modifications should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0100] In this specification, references to "an embodiment" or "a specific implementation" mean that a particular feature, structure, or characteristic described in connection with that embodiment / specific implementation is included in at least one embodiment / specific implementation of this patent. Therefore, the phrase "in one embodiment / specific implementation" appearing in various places in this specification does not necessarily refer to the same embodiment / setting, but rather to potentially different embodiments. Furthermore, specific features, structures, or characteristics may be combined in one or more embodiments / settings in any suitable manner, as will be apparent to those skilled in the art from this disclosure.

[0101] Similarly, it should be understood that in the above description of exemplary embodiments / specific implementations of this patent, various features of this patent are sometimes combined in a single embodiment / specific implementation or its figures and descriptions, with the aim of simplifying the disclosure and aiding in the understanding of one or more of the various patent aspects. However, except for expressly stated instructions to the contrary or obvious technical contradictions or exclusions, the method of description of this patent should not be construed as reflecting an intention that the claimed features are more than expressly stated in each claim. Therefore, the claims following the detailed description are expressly incorporated herein, and each claim exists independently as a separate embodiment / specific implementation of this patent.

[0102] Furthermore, while some embodiments / specific implementations described herein include, but are not limited to, other features included in other embodiments / specific implementations, combinations of features from different embodiments / specific implementations are intended to be within the scope of this patent and form different embodiments / specific implementations, as will be understood by those skilled in the art. For example, in the following claims, embodiments / specific implementations of any claim can be used in any combination.

Claims

1. A paper holding device comprising a rotating shaft and a base, the paper being held by the rotating shaft, characterized in that, The rotating shaft is fixed to one side of the base. The rotating shaft includes a semi-circular unit, and a protruding buckle is arranged on the end face of the semi-circular unit. The base includes a buckle positioning post, which is arranged away from the rotating shaft. The protruding buckle and the buckle positioning post are movably connected to form an arch bridge shape. The semi-circular unit and the buckle positioning post are made of elastic plastic material, and the semi-circular unit and the buckle positioning post can be disconnected through elasticity.

2. The paper clamping device according to claim 1, characterized in that, The semi-arc unit includes a first semi-arc unit and a second semi-arc unit. The latching positioning post includes a first latching positioning post and a second latching positioning post. The first semi-circular unit is movably connected to the first snap-fit ​​positioning post, and the second semi-circular unit is movably connected to the second snap-fit ​​positioning post. The protruding buckle of the first semi-circular unit is arranged on the side away from the second semi-circular unit; The protruding buckle of the second semi-circular unit is arranged on the side away from the first semi-circular unit.

3. The paper clamping device according to claim 2, characterized in that, Both the pivot and the base are made of elastic plastic material. The rotating shaft also includes a rotating shaft, and one end of the first semi-circular unit and the second semi-circular unit is fixed on the rotating shaft. The base includes a rotating shaft receiving groove and a base plane. The rotating shaft receiving groove is arranged on the side of the base plane, and the rotating shaft is fixed in the rotating shaft receiving groove. The rotating shaft receiving groove is provided with a first alignment groove and a second alignment groove. The first semi-circular unit is at least partially received in the first alignment groove, and the second semi-circular unit is at least partially received in the second alignment groove.

4. The paper clamping device according to claim 3, characterized in that, The rotating shaft has large cylinders and U-shaped elastic buckles at both ends, and the U-shaped elastic buckles are formed by material reduction design; The rotating shaft receiving groove is provided with a rotating shaft fixing mechanism and an elastic buckle fixing groove. The rotating shaft fixing mechanism is located close to the large cylinder. The elastic buckle fixing groove includes a stepped buckle, and the U-shaped elastic buckle is embedded in the stepped buckle for fixation.

5. The paper clamping device according to claim 4, characterized in that, The rotating shaft fixing mechanism includes a triangular boss and a U-shaped gate. The rotating shaft is fixed in the rotating shaft receiving groove by an interference fit with the triangular boss; The large cylinder includes a front end face and a side face. The front end face of the cylinder abuts against the U-shaped door; The base plane includes a cylindrical side abutment surface, and the side of the cylinder is connected to the cylindrical side abutment surface.

6. The paper clamping device according to claim 3, characterized in that, The rotating shaft includes a first inner groove and a second inner groove; The first embedded slot and the second embedded slot are arranged between the first semi-circular unit and the second semi-circular unit.

7. The paper clamping device according to claim 3, characterized in that, The base plane includes a rivet hole embedded platform, in which a first rivet hole and a second rivet hole are provided, and the first rivet hole and the second rivet hole are arranged opposite each other in the axial direction.

8. The paper clamping device according to claim 1, characterized in that, The protruding buckle is disposed in the buckle platform. The buckle platform is surrounded by a buckle arc abutting surface, a buckle inclined surface, a buckle flat surface, a buckle arc inner abutting surface, and a buckle sliding transition surface. The protruding buckle is embedded in the buckle positioning post for connection, and the buckle platform abuts against the inside of the buckle positioning post.

9. The paper clamping device according to claim 8, characterized in that, The snap-fit ​​positioning post includes a multi-faceted inner groove, which is disposed on the inner groove platform; The inner groove platform is connected to a positioning arc abutment surface, a positioning inclined surface, a positioning abutment plane, a positioning arc inner abutment surface, and a positioning receiving transition surface, respectively. The protruding buckle is fixed in the polygonal inner groove so that the inner groove platform and the buckle platform abut against each other, thereby forming the arch bridge shape.

10. The paper clamping device according to claim 1, characterized in that, The semi-circular unit includes a cylindrical straight section, which is arranged parallel to the snap-fit ​​positioning post.

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