CN219339050U - Clamping mechanism and file clamping plate - Google Patents

Abstract

The application discloses fixture and file splint belongs to financial office supplies technical field. The clamping mechanism comprises a fixed seat, a clamping plate, a guide rod and a retaining device, wherein the clamping plate moves along the guide rod on the fixed seat, the bottom of the clamping plate is always parallel to the top surface of the fixed seat, and an elastomer is arranged on the guide rod; the retaining device comprises a positioning groove arranged at the bottom of the clamping plate and an elastic piece arranged on the fixed seat; the elastic piece with elasticity can be clamped into the positioning groove under the action of external force, the elastic body on the guide rod drives the clamping plate to clamp the paper, no matter how many paper is clamped, the bottom surface of the clamping plate is always parallel to the clamped paper, no protrusion extrudes the clamped paper, and no indentation is generated on the surface of the paper; the splint can hover above the fixed seat, so that paper can be conveniently inserted between the splint and the fixed seat.

Description

Clamping mechanism and file clamping plate

Technical Field

The utility model relates to the technical field of financial office supplies, in particular to a clamping mechanism and a file clamping plate.

Background

Document clamping plates are often used for displaying, carrying, signing and other actions of bills and document paper, so that writing is convenient, the paper can be kept complete and attractive, and the enterprise image can be improved when the document clamping plates are used in business activities.

The well-known document clamping plate comprises a plate body and a clamping body, wherein the clamping body is hinged with the plate body, as disclosed in the Chinese patent disclosure CN218020950U, a clamping mechanism and a document clamping plate are disclosed, the lower clamping plate, the upper clamping plate and a limiting component can keep the upper clamping plate in a hovering state stable, the fingers can be prevented from being injured by mistaken clamping, the upper clamping plate and the lower clamping plate (or a writing board) in the clamping mechanism are hinged, the upper clamping plate can keep horizontal contact with the clamped paper only when the maximum clamping angle is opened and closed, and the clamping part of the upper clamping plate is in linear contact with the paper when a small amount of paper is usually clamped, so that unrepairable indentations are left on the paper, and the bill, the document and the document are not attractive in the business activity.

Disclosure of Invention

The present application provides a clamping mechanism according to the present application that is capable of overcoming at least one or more of the problems existing in the prior art.

According to a first aspect of the application, a clamping mechanism is provided, the clamping surface of a clamping plate of the clamping mechanism always keeps a horizontal relation with a writing board, the clamping mechanism comprises a fixed seat, a clamping plate, a guide rod and a retaining device, the clamping plate can move along the extending direction of the guide rod on the fixed seat, the clamping surface at the bottom of the clamping plate always keeps parallel to the top surface of the fixed seat, and an elastomer is downwards arranged at the upper part of the guide rod;

the retaining device comprises a positioning groove arranged at the bottom of the clamping plate and an elastic piece arranged on the fixing seat; the elastic piece with elasticity can be clamped into the positioning groove under the action of external force.

The first state of the clamping plate is as follows: the elastic body drives the clamping plate to abut against the direction of the fixing seat, so that the clamping plate can be used for clamping paper;

the second state of the clamping plate is as follows: the clamping plate is pulled to the maximum displacement, the elastic piece is clamped into the positioning groove, and the clamping plate is far away from the fixing seat to hover.

According to the clamping mechanism, the elastic body on the guide rod drives the clamping plate to clamp the paper, no matter how many paper sheets are clamped, the bottom surface of the clamping plate is always parallel to the clamped paper sheets, no protrusion extrudes the clamped paper sheets, and no indentation is generated on the surface of the paper sheets; the splint can hover above the fixed seat, so that paper can be conveniently inserted between the splint and the fixed seat.

In one possible implementation manner, the clamping plate is provided with a guide groove which is arranged corresponding to the guide rod, the bottom of the guide groove is provided with a bearing plate, the upper part of the guide rod passes through the central hole of the bearing plate and is arranged in the guide groove, the outer edge of the upper part of the guide rod is matched with the inner wall of the guide groove, and the bottom of the elastomer on the guide rod is propped against the bearing plate. In the implementation mode, the elastic force of the elastic body drives the clamping plate to press and hold the top surface of the fixing seat.

In one possible implementation, a positioning seat is arranged upwards on the fixed seat, and the upper middle part of the positioning seat is connected with the elastic piece; the bottom of the clamping plate is provided with a positioning cavity at the corresponding position of the positioning seat, and the positioning cavity can accommodate the positioning seat and an elastic piece connected with the positioning seat; the part of the elastic piece extending out of the positioning seat is of a plate-shaped structure and has elasticity; the side wall of the positioning cavity is provided with a positioning groove at the corresponding part of the elastic part extending out of the positioning seat part. In the implementation mode, the positioning seat enables the position of the elastic connecting piece to be lifted, and is convenient to be matched with the positioning groove at the bottom of the lifted clamping plate.

In one possible implementation manner, the elastic piece is fixed at the top of the positioning seat, the elastic piece comprises a supporting part, a bending part, a cantilever part and a body part, one end of the supporting part is fixed with one surface of the positioning seat facing the positioning groove, the top of the supporting part is fixed with one end of the bending part, the other end of the bending part is fixed with the cantilever part, the cantilever part extends to the positioning groove and is arranged in the positioning groove, and the other end of the cantilever part extends from the positioning groove to the positioning seat and is riveted with the positioning seat. In this implementation, the deformation of the elastic member may preferentially occur at the bending portion that is easier to deform, so that the length of the cantilever portion is shorter and the durability is better.

In one possible implementation manner, two cantilever parts of the elastic piece are symmetrically arranged on the positioning seat, two positioning grooves are formed in the clamping plate, and the tail ends of the two cantilever parts are connected through the body part. In the implementation mode, cantilever parts are arranged at two ends of the elastic piece, so that the clamping plate is fixed more stably in the length direction.

In one possible implementation, the elastic body is a spring, and the fixing base is provided with a plurality of guide rods. In this implementation, the number of springs, i.e. the number of guide rods, may be increased, thereby increasing the clamping force of the clamping plate with the fixing base.

In another possible implementation, the elastic body is an elastic sheet, one end of the elastic sheet is fixed on the upper part of the guide rod, the other end of the elastic sheet is propped against the bearing plate at the bottom of the guide groove, and a cavity capable of accommodating the elastic sheet is arranged at the side part of the guide groove. In this implementation, the elastic sheet is produced at a lower cost.

In one possible implementation manner, the clamping plate is horizontally provided with a clamping part forwards, and the bottom plane of the clamping part is parallel to the top plane of the fixing seat; the clamping plate is provided with a lifting plate backwards, and the bottom of the lifting plate is suspended to insert fingers. In this implementation, pulling the lift plate upward by a finger more easily applies an upward pulling force to the splint.

In one possible implementation, the fixing base is provided with a ridge line which is transversely arranged, and the ridge line protrudes upwards from the surface of the fixing base. In this implementation, the ridge is used for stopping paper from further inserting to contact with the guide bar, and when inserting paper to the fixing base between splint generally, no matter how many, paper and ridge touching have the card to feel, and this card is felt easily, and the user can in time stop inserting paper further.

In one possible implementation, the guide rod includes a bottom end, a shaft portion, and a top end, the bottom end and the shaft portion are integrally formed, and the top end of the shaft portion are detachably connected; the top end part is of a cylindrical structure and is matched with a guide groove on the clamping plate; be equipped with the pole fixed orifices that runs through on the fixing base, the fixing base bottom is established by the pole fixed slot in pole fixed orifices department, and the bottom portion sets up in the pole fixed slot, and the shaft part joint is in the pole fixed orifices, and bottom portion size is greater than the shaft part size. In the implementation mode, the size of the bottom end part is far larger than that of the shaft part, so that the connection strength of the guide rod and the fixing seat is increased, and the guide rod is prevented from being broken at the connection part of the shaft part and the fixing seat in the integral forming process; the shaft portion is detachably connected with the tip portion so as to be suitable for assembly production.

In one possible implementation, a notch is arranged above the positioning groove of the positioning cavity at the bottom of the clamping plate, and the notch is concave so that the elastic piece is not contacted with the clamping plate. In the implementation mode, the notch can avoid the abutting of the end part of the elastic piece and the inner wall of the positioning groove, and the elastic force of the elastic body is reduced, so that the clamping force of the clamping plate on paper is reduced.

In one possible implementation, the grip bottom surface is provided with a non-slip coating. In this implementation, the anti-slip coating is used to increase the friction between the nip and the paper.

In a second aspect of the present application, the present application further provides a document clamping plate, including the above-mentioned clamping mechanism and a writing board, the above-mentioned clamping mechanism is detachably connected to the writing board, and the writing board is a plate-shaped structure.

The various possible implementations of any of the foregoing aspects may be combined without contradiction between the schemes.

Drawings

Fig. 1 is a schematic structural diagram of a clamping mechanism according to an embodiment of the present application.

Fig. 2 is a schematic view of a partial cross-sectional structure of a clamping mechanism in a first state according to an embodiment of the present application.

Fig. 3 is a schematic view of a partial cross-sectional structure of a clamping mechanism in a second state according to an embodiment of the present application.

Fig. 4 is a partial enlarged view of a positioning cavity in a clamping mechanism provided in an embodiment of the present application.

Fig. 5 is an exploded view of a clamping mechanism provided in an embodiment of the present application.

Fig. 6 is a schematic bottom structure of the fixing base in the clamping mechanism of fig. 1.

Fig. 7 is a schematic view of another structure of an elastic body in a clamping mechanism according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a file folder according to an embodiment of the present application.

Reference numerals illustrate:

10. a fixing seat; 11. a fastener; 12. a ridge; 13. a positioning seat; 15. an elastic member; 151. a support part; 152. a bending part; 153. a cantilever portion; 154. a body portion; 16. a rod fixing hole; 161. a rod fixing groove; 20. a clamping plate; 21. a clamping part; 22. a lifting plate; 23. a guide groove; 231. a carrying plate; 24. a positioning cavity; 241. a positioning groove; 242. a notch; 25. a label slot; 30. a guide rod; 31. a bottom end portion; 32. a distal end portion; 33. a shaft portion; 341. a spring; 342. an elastic sheet; 40. a writing board.

Detailed Description

The present application will be described below with reference to the accompanying drawings, which show several embodiments of the present application. It should be understood, however, that this application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; indeed, the embodiments described hereinafter are intended to provide a more complete disclosure of the present application and to fully convey the scope of the application to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide yet additional embodiments.

It should be understood that throughout the drawings, like reference numerals refer to like elements. In the drawings, the size of certain features may be modified for clarity. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All terms (including technical and scientific terms) used in the specification have the meanings commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The use of the terms "comprising," "including," and "containing" in the specification mean that the recited features are present, but that one or more other features are not excluded. The use of the phrase "and/or" in the specification includes any and all combinations of one or more of the associated listed items.

In the description, an element is referred to as being "on," "attached" to, "connected" to, "coupled" to, "contacting" or the like another element, and the element may be directly on, attached to, connected to, coupled to or contacting the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly coupled to," or "directly contacting" another element, there are no intervening elements present.

On the one hand, the embodiment of the application provides a fixture, the fixture used on the writing board is generally divided into two types, one type is an elastic clamping plate hinged with the writing board, the other type is a magnetic clamping plate which can be folded, the magnetic clamping plate and the writing board attract each other to clamp paper, but the design can only clamp less paper, while the common elastic clamping plate hinged with the writing board can clamp more paper, but can leave the indentation on the clamped paper, and the financial bill and the contract document in the business activity leave the indentation to damage the enterprise image, so the fixture of which the clamping surface of the clamping plate always keeps the horizontal relation with the writing board can avoid the problems.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of a clamping mechanism, where the clamping mechanism includes a fixing base 10, a clamping plate 20, a guide rod 30 and a holding device, the clamping plate 20 can move along an extending direction of the guide rod 30 on the fixing base 10, a clamping surface at the bottom of the clamping plate 20 is always parallel to a top surface of the fixing base 10, that is, a clamping surface at the bottom of the clamping plate 20 for clamping paper is always parallel to a writing board 40, an elastomer is disposed on the guide rod 30, and an elastic force of the elastomer drives the clamping plate 20 to abut against the fixing base 10, that is, a first state of the clamping mechanism: the elastic body drives the clamping plate 20 to abut against the top surface of the fixed seat 10, so that the clamping plate can be used for clamping paper, as shown in fig. 2;

the holding device includes a positioning slot 241 disposed at the bottom of the clamping plate 20 and an elastic member 15 disposed on the fixing base 10, under the action of an external force, when the clamping plate 20 is pulled to a limit distance from the fixing base 10, the elastic member 15 with elasticity is clamped into the positioning slot 241, and when the clamping plate 20 is pressed down without the external force, the elastic force of the elastic body is insufficient to change the shape of the elastic member 15 so as to deform and separate from the positioning slot 241, namely, the second state of the clamping mechanism: the elastic member 15 of the fixing base 10 is caught in the positioning groove 241 of the clamping plate 20, and the clamping plate 20 is maintained to hover farthest from the fixing base 10, as shown in fig. 3.

Specifically, referring to fig. 2 and 3 together, fig. 2 shows a first state of the clamping mechanism, fig. 3 shows a second state of the clamping mechanism, a guide groove 23 corresponding to the guide rod 30 on the fixing base 10 is provided on the clamping plate 20, a bearing plate 231 is provided at the bottom of the guide groove 23, the upper portion of the guide rod 30 passes through a central hole of the bearing plate 231 and is disposed in the guide groove 23, an outer edge of the upper portion of the guide rod 30 is adapted to an inner wall of the guide groove 23, an elastic body is provided at the upper portion of the guide rod 30 downward, the elastic body shown in fig. 2 and 3 is a spring 341, the bottom of the spring 341 abuts against the bearing plate 231, and the elastic force of the spring 341 drives the clamping plate 20 to press the top surface of the fixing base 10.

The clamping plate 20 is provided with the clamping part 21 in a forward horizontal mode, the bottom of the clamping part 21 is a plane parallel to the top surface of the fixing seat 10, the clamping plate 20 is provided with the plate-shaped lifting plate 22 backwards, four fingers can be inserted into the bottom of the lifting plate 22 in a hanging mode, the fingers pull the lifting plate 22 upwards to apply upward pulling force to the clamping plate 20 more easily, the thickness of the clamping part 21 is smaller than that of the guide groove 23 on the clamping plate 20, the thickness of the clamping part 21 in the application is 2mm, the maximum thickness of the clamping plate 20 is 5mm, and the clamping plate belongs to an ultrathin type.

In some embodiments, the clamping plate 20 and the lifting plate 22 may be provided with a label slot 25, and the gummed paper in the label slot 25 may be signed.

In some embodiments, the fixing base 10 is provided with a ridge 12 disposed transversely, the ridge 12 protrudes upwards from the surface of the fixing base 10, the ridge 12 is formed by stamping a sheet metal part, the ridge 12 is used for blocking paper from being further inserted into contact with the guide rod 30, no matter how much, the paper is in contact with the ridge 12 when the paper is inserted between the fixing base 10 and the clamping plate 20, and the jamming feeling is easily perceived, so that a user can stop further inserting the paper in time.

In one possible implementation manner, the guide rod 30 includes a bottom end 31, a shaft 33, and a top end 32, the bottom end 31 is integrally formed with the shaft 33, the bottom of the top end 32 is riveted with the top of the shaft 33, one end of the spring 341 abuts against the bottom of the top end 32, the other end of the spring 341 abuts against the bearing plate 231, the top end 32 has a cylindrical structure, the diameter of which is slightly smaller than the inner diameter of the guide groove 23 on the clamping plate 20, in some cases, the guide rod 30 is not provided with the bottom end 31, and the shaft 33 of the guide rod 30 is integrally formed with the top surface of the fixing seat 10, so that the production cost is lower; referring to fig. 6, fig. 6 shows a structure of the bottom of the fixing base 10, the fixing base 10 is provided with a through rod fixing hole 16, the bottom of the fixing base 10 is provided with a rod fixing groove 161 at the rod fixing hole 16, a shaft portion 33 of the guide rod 30 is riveted with a top end portion 32 after passing through the rod fixing hole 16 from the bottom of the fixing base 10, a bottom end portion 31 of the bottom of the shaft portion 33 is matched with the rod fixing groove 161, the size of the bottom end portion 31 is far greater than that of the shaft portion 33, the connection strength of the guide rod 30 and the fixing base 10 is increased, and breakage of the guide rod 30 at the connection position of the shaft portion 33 and the fixing base 10 in one-piece molding is avoided.

Referring to fig. 4 and 5 together, fig. 4 shows the structure of the clamping plate 20 at the positioning cavity 24, fig. 5 shows the structure of the positioning seat 13 on the fixing seat 10, in some cases, the positioning seat 13 is integrally formed with the elastic member 15, the positioning seat 13 is disposed on the top of the fixing seat 10 and the elastic member 15 disposed thereon is in a plate-shaped structure with elasticity; the bottom of the clamping plate 20 is provided with a positioning cavity 24 at the corresponding position of the positioning seat 13, the positioning cavity 24 can accommodate the positioning seat 13 and the elastic piece 15 connected with the positioning seat, a positioning groove 241 is arranged on the side wall of the positioning cavity 24 at the corresponding position of the outer end of the cantilever of the elastic piece 15, and the outer end of the cantilever of the elastic piece 15 can be deformed and clamped into the positioning groove 241 under the action of external force and can also be deformed and separated from the positioning groove 241 under the action of external force.

In order to further increase the strength and durability of the elastic member 15, as shown in fig. 4 and 5, the present application provides an elastic member 15, wherein the elastic member 15 is riveted on top of the positioning seat 13, the elastic member 15 includes a supporting portion 151, a bending portion 152, a cantilever portion 153 and a body portion 154, one end of the supporting portion 151 is fixed to one surface of the positioning seat 13 facing the positioning groove 241, the top of the supporting portion 151 is fixed to one end of the arc-shaped bending portion 152, the other end of the bending portion 152 is fixed to the cantilever portion 153, the cantilever portion 153 extends to the positioning groove 241 and is placed in the positioning groove 241, and the other end of the cantilever portion 153 extends from the positioning groove 241 to the positioning seat 13 and is riveted with the positioning seat 13; the cantilever parts 153 are two symmetrically arranged on the positioning seat 13, and two positioning grooves 241 are arranged on the corresponding clamping plate 20, the tail ends of the two cantilever parts 153 can be connected through the body part 154, namely, two ends of one elastic piece 15 are provided with cantilevers (cantilever parts 153) matched with the positioning grooves 241; the deformation of the cantilever portion 153 may occur preferentially at the bending portion 152 that is easier to deform, so that the cantilever portion 153 is shorter in length and better in durability.

In one possible implementation manner, the notch 242 is arranged above the positioning groove 241 of the positioning cavity 24 at the bottom of the clamping plate 20, the notch 242 is concave to enable the elastic element 15 not to be in contact with the clamping plate 20, the end of the elastic element 15 is prevented from abutting against the inner wall of the positioning groove 241, the elastic force of the spring 341 is reduced, and therefore the clamping force of the clamping plate 20 on paper is reduced, and it is noted that in order to increase the clamping force of the clamping plate 20 on paper, the number of the guide rods 30 can be increased, namely, the number of the elastic bodies on the guide rods 30 is increased, so that the elastic force of the elastic bodies is increased.

In a possible implementation, referring to fig. 7, fig. 7 shows another structure of the elastic body, the elastic body is an elastic piece 342, two ends of the elastic piece 342 respectively abut below the top end portion 32 and above the bearing plate 231, in which the elastic body is not placed in the clamping plate 20, and the other end abuts against the top surface of the bottom end portion 31, and correspondingly, a cavity for accommodating the elastic piece 342 should be further provided on the side portion of the guide groove 23 on the clamping plate 20.

In two aspects, referring to fig. 8, fig. 8 shows a document holder, which includes the above-mentioned holding mechanism and a writing board 40, wherein the fixing base 10 is connected with the writing board 40 through a fastener 11, and the writing board 40 has a plate-shaped structure on which paper can be placed.

In the ultrathin file clamping plate, the size of the writing board 40 is 320x235mm, the size of the clamping mechanism is 102x30x6mm, and the maximum upward displacement of the clamping plate 20 in the clamping mechanism is 2.7mm, so that 25-28 pages of paper can be clamped.

When the file clamping plate is used for clamping paper, the lifting plate 22 is pulled upwards by fingers, the 'clicking' sound is heard, then the lifting action is stopped, at the moment, the elastic part 15 is partially clamped into the positioning groove 241, the elastic force of the elastic body on the guide rod 30 is insufficient to overcome the connection relation between the elastic part 15 and the positioning groove 241, the clamping plate 20 is kept at the maximum displacement position, the spring 341 is compressed to the limit height, the elastic part 15 is prevented from moving to the bottom of the clamping plate 20 from being separated from the positioning groove 241, when the clamping plate 20 is in a hovering state, the paper to be clamped is inserted into the fixing seat 10, one hand stabilizes the paper, the other palm center presses the clamping plate 20 downwards, the four fingers are abutted against the back of the writing plate 40, after the 'clicking' sound is heard, the pressing is stopped, the elastic body on the guide rod 30 drives the clamping plate 20 to clamp the paper, no matter how much the bottom of the clamped paper is kept parallel to the clamped paper, no matter how much the bottom of the clamping plate 20 (the clamping part 21) is kept to be clamped, no protrusion is extruded to be clamped, the purpose of traceless clamping is achieved, and the bottom of the clamping part 21 can also be provided with a coating to increase the friction force between the clamping part 21 and the paper.

Although exemplary embodiments of the present application have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present application without departing from the spirit and scope of the present application. Accordingly, all changes and modifications are intended to be included within the scope of the present application as defined by the appended claims. The application is defined by the following claims, with equivalents of the claims to be included therein.

Claims (10)

1. The clamping mechanism comprises a fixed seat, a clamping plate, a guide rod and a retaining device, wherein the clamping plate moves along the extending direction of the guide rod on the fixed seat; the retaining device comprises a positioning groove arranged at the bottom of the clamping plate and an elastic piece arranged on the fixing seat, and the elastic piece with elasticity can be clamped into the positioning groove under the action of external force;

first state of clamping plate: the elastic body drives the clamping plate to abut against the direction of the fixing seat;

second state of clamping plate: the clamping plate is pulled to the maximum displacement, the elastic piece is clamped into the positioning groove, and the clamping plate is far away from the fixing seat to hover.

2. The clamping mechanism according to claim 1, wherein the clamping plate is provided with a guide groove which is arranged corresponding to the guide rod, the bottom of the guide groove is provided with a bearing plate, the upper part of the guide rod passes through a central hole of the bearing plate and is arranged in the guide groove, the outer edge of the upper part of the guide rod is matched with the inner wall of the guide groove, and the bottom of the elastomer on the guide rod is propped against the bearing plate.

3. The clamping mechanism according to claim 1, wherein a positioning seat is arranged upwards on the fixing seat, and the middle upper part of the positioning seat is connected with the elastic piece; the bottom of the clamping plate is provided with a positioning cavity at the corresponding position of the positioning seat, and the positioning cavity can accommodate the positioning seat and an elastic piece connected with the positioning seat; the part of the elastic piece extending out of the positioning seat is of a plate-shaped structure and has elasticity; and a positioning groove is formed in the side wall of the positioning cavity at the position corresponding to the position, extending out of the positioning seat part, of the elastic piece.

4. The clamping mechanism of claim 3, wherein the elastic member is fixed at the top of the positioning seat, the elastic member comprises a supporting portion, a bending portion, a cantilever portion and a body portion, one end of the supporting portion is fixed with one surface of the positioning seat facing the positioning groove, the top of the supporting portion is fixed with one end of the bending portion, the other end of the bending portion is fixed with the cantilever portion, the cantilever portion extends to the positioning groove, the cantilever portion is arranged in the positioning groove, and the other end of the cantilever portion extends from the positioning groove to the positioning seat and is riveted with the positioning seat.

5. The clamping mechanism according to claim 4, wherein the two cantilever parts of the elastic piece are symmetrically arranged on the positioning seat, and the tail ends of the two cantilever parts are connected through the body part.

6. The clamping mechanism of claim 1, wherein the elastic body is a spring, and the fixing base is provided with a plurality of guide rods.

7. The clamping mechanism according to claim 2, wherein the elastic body is an elastic sheet, one end of the elastic sheet is fixed on the upper part of the guide rod, the other end of the elastic sheet is propped against the bearing plate at the bottom of the guide groove, and a cavity for accommodating the elastic sheet is arranged at the side part of the guide groove.

8. The clamping mechanism of claim 1, wherein the guide bar comprises a bottom end portion, a shaft portion, and a top end portion, the bottom end portion being integrally formed with the shaft portion, the top end portion of the shaft portion being detachably connected to the top end portion; the top end part is of a cylindrical structure and is matched with the guide groove on the clamping plate; the fixing seat is provided with a penetrating rod fixing hole, the bottom of the fixing seat is provided with a rod fixing groove at the rod fixing hole, the bottom end part is arranged in the rod fixing groove, the shaft part is clamped in the rod fixing hole, and the size of the bottom end part is larger than that of the shaft part.

9. A clamping mechanism according to claim 3, wherein a notch is provided above the locating slot of the clamping plate bottom locating cavity, the notch being recessed to prevent the resilient member from contacting the clamping plate.

10. A document holder comprising a holding mechanism according to any one of claims 1 to 9, and further comprising a writing board, the writing board having a plate-like configuration, the holding mechanism being removably attachable to the writing board.

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