Paper shredder

Abstract

The invention provides a paper shredder, and belongs to the technical field of machinery. The problem that paper feeding stability is poor is solved. A paper placing groove is formed in the top of the machine body, the machine cover is hinged to the top of the machine body, a paper inlet is formed in the bottom wall of the paper placing groove, a paper rubbing wheel with the top higher than the bottom wall of the paper placing groove is arranged at the position, close to the rear portion of the paper inlet, in the machine body, a paper pressing plate assembly is slidably connected to the inner side of the machine cover in the vertical direction, and a paper pressing spring is arranged between the paper pressing plate assembly and the machine cover. A receding opening is formed in the bottom of the paper pressing plate assembly, the upper side of the paper pressing plate assembly is movably connected with an abutting piece, the abutting piece is provided with an acting part, an elastic piece is arranged between the abutting piece and the paper pressing plate assembly, and the abutting piece moves under the action of the elastic piece so that the acting part can enter the receding opening downwards. When the machine cover is closed and no paper exists in the paper placing groove, the pickup roller penetrates into the receding opening and abuts against the acting part, and the contact position of the acting part and the pickup roller is located in front of the rotating center line of the pickup roller in the state. The feeding device has the advantages of good feeding stability and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machinery, and relates to a paper shredder. BACKGROUND

[0002] The paper shredder is a commonly used office equipment, which is used for shredding waste files. With the improvement of data security, the paper shredder is used more and more widely. For example, the automatic paper shredder with antimony nail structure disclosed in patent application No. 201910342708.8 comprises a paper supporting box, a paper shredder cover body which is pivotally connected to one end of the paper supporting box and is used for closing or opening the automatic paper shredder, a shell which is arranged below the paper supporting box and is fixedly connected with the paper supporting box, a paper supporting plate which is arranged on the upper end surface of the inner side of the paper supporting box and is used for holding a stack of paper placed in the paper supporting box, a paper inlet which is formed in the paper supporting plate and divides the paper supporting plate into a first paper supporting plate part and a second paper supporting plate part, a paper shredding assembly which has a first cutter shaft group and a second cutter shaft group, wherein the first cutter shaft group and the second cutter shaft group are arranged on the left side and the right side of the paper inlet respectively and are used for cooperating to make the broken paper enter the paper inlet, a paper rubbing assembly which comprises a paper rubbing wheel shaft and a plurality of paper rubbing wheels, the paper rubbing assembly is arranged in the first paper supporting plate part and is close to the paper inlet, and the plurality of paper rubbing wheels are nested around the paper rubbing wheel shaft, wherein the upper parts of the plurality of paper rubbing wheels partially protrude from the upper surface of the first paper supporting plate part through a plurality of paper picking holes formed in the first paper supporting plate part, so that the plurality of paper rubbing wheels are driven to rotate by a driving motor, and the bottom paper in the stack of paper placed on the paper supporting plate is driven by the plurality of paper rubbing wheels to move towards the inner wall of the paper supporting box, and then reversely moves under the reaction force of the inner wall, and the bottom surface paper is deformed in the paper inlet to move downward into the paper inlet; a driving motor which is arranged in the paper supporting box and is connected with the first cutter shaft group, the second cutter shaft group and the paper rubbing assembly; and a paper pressing plate which is elastically connected to the lower end surface of the paper shredder cover body by a plurality of elastic elements, and the paper pressing plate is correspondingly arranged on the upper surface of the paper supporting plate and is parallel to the paper supporting plate, and when the paper shredder cover body is closed, the paper pressing plate is tightly pressed on the stack of paper placed on the paper supporting plate.

[0003] However, the automatic paper shredder with the antimony nail structure has the following problems: the paper winding wheel protrudes from the paper supporting plate. When the paper is placed on the paper supporting plate and the cover of the paper shredder is closed, the paper on the first paper supporting plate part will be higher than the paper on the second paper supporting plate part due to the existence of the paper winding wheel (this is irrelevant to whether the whole paper supporting plate is inclined), which leads to the fact that the paper pressing plate cannot be pressed on the paper as a whole in practice, especially the part of the paper on the second paper supporting plate part cannot form effective contact with the paper pressing plate, and the paper pressing plate is required to form pressure on the paper through the elastic force of the elastic element to match the friction force between the paper winding wheel and the paper to realize the movement of the paper, so it is difficult to ensure the stable conveying of the paper in practice. SUMMARY

[0004] The purpose of the present application is to solve the problem of poor paper feeding stability in the prior art.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A paper shredder, comprising a machine body with a downwardly concave top provided with a paper placing groove, and a machine cover hinged to the top of the machine body and capable of being flipped open, wherein the bottom wall of the paper placing groove is provided with a paper inlet, the top of the machine body is provided with a paper winding wheel at a position close to the rear of the paper inlet, the top of the paper winding wheel is higher than the bottom wall of the paper placing groove, the inner side of the machine cover is slidably connected with a paper pressing plate assembly in the vertical direction, and a paper pressing spring is arranged between the two, characterized in that the bottom of the paper pressing plate assembly is provided with a clearance, the upper side of the paper pressing plate assembly is movably connected with a pressing piece, the pressing piece has an acting part, an elastic element is arranged between the pressing piece and the paper pressing plate assembly, the acting part of the pressing piece is moved downward into the clearance under the action of the elastic element, the paper winding wheel penetrates into the clearance and abuts against the acting part in the state that the machine cover is closed and the paper placing groove is paperless, and the contact position between the acting part and the paper winding wheel is located in front of the rotation center line of the paper winding wheel in this state.

[0007] In the automatic paper shredding mode, the paper stack is placed in the paper slot after being stacked, and then the cover is closed. Since the bottom of the paper pressing plate assembly is provided with a clearance, the position of the clearance corresponds to the paper roller after the cover is closed, that is, the clearance is used for the paper roller to be embedded, so that the bottom of the paper pressing plate assembly is pressed on the paper as a whole after the cover is closed, and the paper forms an arch into the clearance at the paper roller. In the conventional art, the clearance is not selected to be provided on the bottom of the paper pressing plate assembly for the paper roller to be embedded so that the paper pressing plate assembly can be pressed on the paper as a whole, because as described above, the paper will form an arch into the clearance, and in the case that the paper is pressed by the paper pressing plate assembly, the rotation of the paper roller can make the paper further form an upward bending into the clearance, that is, the clearance is stuck, so that the paper cannot be smoothly transported, which is obviously contrary to the stable transportation of the paper. In the case, the abutting member is movably connected on the paper pressing plate assembly, the abutting member has an acting portion, and the abutting member and the paper pressing plate assembly are provided with an elastic member, the acting portion of the abutting member is moved downward into the clearance under the action of the elastic member, so that the arch of the paper abuts against the acting portion of the abutting member, and since the contact position of the acting portion and the paper roller is located in front of the center line of the rotation of the paper roller in the case that the cover is closed and the paper slot is paperless, the abutting member is pushed upward by the paper in the case that the paper slot has paper, and the contact position between the acting portion and the paper is also necessarily located in front of the center line of the rotation of the paper roller, that is, the contact position between the acting portion and the arch of the paper is in the front part of the arch, and under the action of the elastic force of the elastic member, the acting portion will form a downward pressing force on the rear part of the arch of the paper, thereby limiting the paper feeding direction of the paper roller to be forward and obliquely downward, which is just the direction toward the paper inlet, so as to ensure that the paper will naturally bend into the paper inlet in the process of being fed forward. In order to better understand the working principle, the paper slot is divided into a front region and a rear region by the paper inlet, and the paper roller is in the rear region. That is to say, the front part of the paper is pressed by the paper pressing plate assembly in the front region of the paper slot, the rear part of the paper is pressed by the paper pressing plate assembly in the rear region of the paper slot, the paper roller is in contact with the rear part of the lowermost paper, and when the paper roller starts to rotate, the front part of the lowermost paper remains stationary, while the rear part of the paper is rubbed forward under the friction force of the paper roller, and cooperates with the action of the abutting member, so that the paper is bent into the paper inlet. When the bent part of the paper contacts the paper shredding mechanism in the paper shredder, the paper shredding mechanism will form a pulling force on the paper, thereby pulling the whole paper in. Through the above arrangement, the paper pressing plate assembly can be pressed on the paper as a whole, which ensures that the paper in front of the paper inlet can be stably pressed, avoids the situation that the paper is pushed forward as a whole when the paper roller rotates because the paper in this position is not stably pressed, ensures that the paper can be stably bent into the paper inlet, and thereby improves the stability of the paper feeding.

[0008] Moreover, because the paper pressing plate assembly acts on the paper as a whole, if there is a paper clip on the paper, the paper clip can be firmly pressed against the paper pressing plate assembly when the paper is being pulled into the paper slot, so that the paper clip is separated from the paper. Specifically, the position of the paper clip on the paper is uncertain, and the paper clip can be clamped on any side of the paper. In the case that the paper pressing plate assembly acts on the paper as a whole, the paper clip can be clamped on any side of the paper, and the paper pressing plate assembly can be abutted, thereby achieving a good effect of removing the paper clip.

[0009] In the shredder, the abutting member is hinged to the paper pressing plate assembly, and the abutting member swings under the action of the elastic member to the direction of downward and rearward.

[0010] Through the hinged arrangement, the abutting member swings. The action part does not act straight downward, but acts downward and rearward, so that a more obvious guiding effect can be formed in the paper feeding direction of the paper roller, and the paper can be more smoothly bent into the paper slot.

[0011] In the shredder, the abutting member is in a sheet shape and is arranged in a transverse direction, the front end of the abutting member is bent upward, the action part is the bent part of the abutting member, and the abutting member can swing to abut the front end part of the abutting member against the front edge of the accommodation slot under the action of the elastic member.

[0012] The abutting member is in a sheet shape, and has a simple structure and a relatively low cost. The shredder has both manual shredding and automatic shredding. When the paper slot is empty and the cover is closed, the paper roller is also rotating. Since the paper roller directly contacts the action part of the abutting member when the paper slot is empty, the front end of the abutting member is bent upward to form the action part, so as to reduce the abrasion between the paper roller and the abutting member during the rotation of the paper roller, and ensure the stability of the automatic paper feeding in a long-term use.

[0013] In addition, the front end of the abutting member is bent upward, and the abutting member can swing to abut the front end part of the abutting member against the front edge of the accommodation slot under the action of the elastic member. In this way, the position of the abutting member is limited when the cover is opened, so that the action part of the abutting member can reliably act after the cover is closed, and the abutting member does not swing too much when the cover is opened, so that the action part of the abutting member is not in front of the rotation center line of the paper roller after the cover is closed.

[0014] In the shredder, the left and right ends of the abutting member have upwardly folded hinge parts, the paper pressing plate assembly is provided with two hinge ears, the two hinge ears are arranged opposite to each other in the left-right direction, the abutting member is located between the two hinge ears, and the abutting member is hinged to the paper pressing plate assembly through a hinge shaft penetrating the hinge ears and the hinge parts.

[0015] Through the above setting, the sheet-shaped pressing piece can be hinged with the paper pressing plate assembly, so that the acting part on the pressing piece can generate downward and rearward action to guide the paper feeding direction of the paper roller.

[0016] In the above shredder, the rear end of the pressing piece is provided with a tab, the tab is downwardly bent to form a connecting part, the elastic member is a tension spring, and the two ends of the tension spring are connected to the paper pressing plate assembly and the connecting part respectively.

[0017] Through the above setting, the tension spring pulls the rear end of the pressing piece upward and forward, so that the acting part at the front end of the pressing piece naturally generates a rearward and downward pressing force.

[0018] In the above shredder, as another technical solution, the elastic member is a torsion spring, the torsion spring is arranged on the hinge shaft, and the two ends of the torsion spring are respectively abutted against the paper pressing plate assembly and the pressing piece.

[0019] In the above shredder, the bottom of the paper pressing plate assembly is provided with a paper pressing part in a protruding manner, the paper pressing part is in a strip shape and arranged in the left-right direction, and the paper pressing part is located above the paper inlet.

[0020] After the paper is put into the paper slot and the cover is closed, the paper pressing plate assembly is pressed on the paper, and at this time, the paper pressing part is also pressed on the paper. Since the paper pressing part is located above the paper inlet, the paper pressing part will press the paper downward into the paper inlet, and in combination with the limitation of the paper feeding direction of the paper roller by the pressing piece, the paper can be more easily bent toward the paper inlet to realize stable paper feeding. Moreover, as the paper is continuously reduced, the downward pressing action of the paper pressing part is more obvious.

[0021] In the above shredder, the cover is provided with a manual paper feeding port, the paper pressing plate assembly is provided with a paper passing port, the paper passing port is located above the paper inlet, the manual paper feeding port is located above the paper passing port, and the paper pressing part is formed by downwardly folding the front side edge of the paper passing port or by downwardly folding the rear side edge of the paper passing port.

[0022] The shredder has two modes of manual paper shredding and automatic paper shredding. Manual paper shredding means that in the state of no paper in the paper slot, the user can directly manually put a small amount of paper from the paper feeding port on the cover into the shredder mechanism through the paper inlet for shredding without opening the cover, and therefore the paper passing port is arranged on the paper pressing plate assembly to ensure that the paper can pass through. The front side edge or the rear side edge of the paper passing port is directly downwardly folded to form the paper pressing part, so that in the automatic paper shredding mode, the paper pressing part can press the paper downward into the paper inlet, and in combination with the limitation of the paper feeding direction of the paper roller by the pressing piece, the paper can be more easily bent toward the paper inlet to realize stable paper feeding.

[0023] Compared with the prior art, the shredder has the following advantages:

[0024] 1. By setting a gap on the paper pressing plate assembly, the gap is embedded for the paper roller when the cover is closed, so that the paper pressing plate assembly can act on the paper as a whole, ensuring that the paper in the front position of the paper inlet can be stably pressed, avoiding the situation that the paper is pushed forward as a whole when the paper roller rotates because the paper at this position is not stably pressed, and at the same time, the upper side of the paper pressing plate assembly is movably connected to the pressing member, the contact position of the pressing member with the paper is in front of the rotation center line of the paper roller, and the acting part of the pressing member forms a downward force on the rear part of the arch of the paper under the elastic force of the elastic member, thereby limiting the paper feeding direction of the paper roller to be inclined downward, which is just the direction towards the paper inlet, thereby ensuring that the paper will naturally bend into the paper inlet during the process of being fed forward, and the stability of paper feeding is improved.

[0025] 2. Because the paper pressing plate assembly acts on the paper as a whole, if there is a paper clip on the paper, when the paper is pulled into the paper inlet, no matter which side the paper clip is clamped on, it can form a firm abutment with the edge of the paper pressing plate assembly to separate the paper, which has a good effect of removing the paper clip.

[0026] 3. The paper pressing part is protrudingly arranged at the bottom of the paper pressing plate assembly, the paper pressing part is strip-shaped and arranged in the left-right direction, and the paper pressing part is located above the paper inlet. By the paper pressing part, the paper can be pressed downward into the paper inlet, and in combination with the limitation of the paper feeding direction of the paper roller by the pressing member, the paper can more easily form a bend into the paper inlet to realize stable paper feeding. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of the paper shredder in the closed state of the cover.

[0028] Figure 2 is a perspective view of the paper shredder in the open state of the cover.

[0029] Figure 3 is a sectional view of the paper shredder in the closed state of the cover.

[0030] Figure 4 is a sectional view of the paper shredder in the closed state of the cover. Figure 3

[0031] Figure 5 is a sectional view of the paper shredder in the closed state of the cover. Figure 4

[0032] Figure 6 is a sectional view of the paper shredder in the closed state of the cover.

[0033] Figure 7 is a perspective view of the paper shredder in the closed state of the cover. ​​

[0034] Figure 8 is a perspective view of the paper pressing plate assembly.

[0035] Figure 9 is another perspective view of the paper pressing plate assembly.

[0036] In the figure, 1 is a machine body; 1a is a main body; 1b is a paper placing box; 1b1 is a paper placing groove; 1b2 is a paper inlet; 2 is a machine cover; 2a is a manual paper placing inlet; 3 is a paper shredding mechanism; 4 is a paper rubbing wheel; 5 is a paper pressing plate assembly; 6 is a paper pressing spring; 7 is a plate body; 7a is a paper passing opening; 7b is a position leaving opening; 7c is a paper pressing part; 8 is a pressing part; 8a is an acting part; 8b is a hinged part; 8c is a connecting part; 9 is an elastic part; 10 is a hinged lug; 11 is a hinged shaft; 12 is a guide column; 13 is a guide block; 14 is a connecting column; 15 is a guide seat; 15a is a paper guiding channel. DETAILED DESCRIPTION

[0037] The following is a further description of the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0038] Embodiment One

[0039] As Figure 1 , Figure 2 and Figure 3As shown, a paper shredder comprises a body 1 and a cover 2 hinged on the top of the body 1 and openable by turning, the top of the body 1 is concave downward and provided with a paper placing groove 1b1, the bottom wall of the paper placing groove 1b1 is provided with a paper inlet 1b2, the paper inlet 1b2 is located at a position a little behind the middle of the paper placing groove 1b1 along the front-rear direction, the top of the body 1 is provided with a paper shredding mechanism 3 below the paper inlet 1b2, the cover 2 is provided with a manual paper inlet 2a, and the paper inlet 1b2 is located below the manual paper inlet 2a. The top of the body 1 is provided with a paper rubbing wheel 4 behind the paper inlet 1b2, the paper rubbing wheel 4 is rotatably connected in the body 1 through an axle, the axle is arranged along the left-right direction, the top of the paper rubbing wheel 4 is higher than the bottom wall of the paper placing groove 1b1, that is, the bottom wall of the paper placing groove 1b1 is provided with a through hole, and the paper rubbing wheel 4 partially penetrates out of the through hole. The same as the prior art, the paper shredder also has two working modes, one is manual paper shredding, the staff inserts the paper into the paper shredding mechanism 3 through the manual paper inlet 2a and the paper inlet 1b2 to be shredded; the other is automatic paper shredding, the cover 2 is turned to be open, the paper is placed in the paper placing groove 1b1 after being stacked, and then the cover 2 is covered, the paper is automatically sent into the paper shredding mechanism 3 through the paper inlet 1b2 by the paper rubbing wheel 4 to be shredded. The same as the prior art, the paper shredding mechanism 3 is driven by a motor, and the paper shredding mechanism 3 is linked with the paper rubbing wheel 4, that is, when the paper shredding mechanism 3 starts to work, the paper rubbing wheel 4 starts to work. The body 1 comprises a main body 1a and a paper placing box 1b fixed on the top of the main body 1a, and the paper placing groove 1b1 is arranged on the paper placing box 1b and the cover 2 is hinged on the paper placing box 1b.

[0040] Specifically, as Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the inner side of the cover 2 is connected with a paper pressing plate assembly 5, the paper pressing plate assembly 5 is slidingly connected with the cover 2 along the vertical direction, a paper pressing spring 6 is arranged between the paper pressing plate assembly 5 and the cover 2, the paper pressing spring 6 acts downward on the paper pressing plate assembly 5, the paper pressing plate assembly 5 is provided with a paper passing opening 7a along the vertical direction, the paper passing opening 7a is located above the paper inlet 1b2, and the manual paper placing opening 2a is located above the paper inlet 1b2. The bottom surface of the paper pressing plate assembly 5 is a plane and is parallel to the bottom wall of the paper placing groove 1b1, in the state that the paper shredder is closed with the cover 2 and there is no paper in the paper placing groove 1b1, the paper pressing plate assembly 5 abuts against the bottom wall of the paper placing groove 1b1. The bottom of the paper pressing plate assembly 5 is provided with a clearance opening 7b, the clearance opening 7b is square, the upper side of the paper pressing plate assembly 5 is movably connected with a pressing piece 8, the pressing piece 8 has an acting portion 8a, an elastic member 9 is arranged between the pressing piece 8 and the paper pressing plate assembly 5, and the pressing piece 8 is movable under the action of the elastic member 9 to make the acting portion 8a enter the clearance opening 7b downward, in the state that the cover 2 is closed and there is no paper in the paper placing groove 1b1, the rubbing wheel 4 enters the clearance opening 7b and abuts against the acting portion 8a, and in this state, the contact position between the acting portion 8a and the rubbing wheel 4 is located in front of the rotation center line of the rubbing wheel 4, that is, the position where the acting portion 8a abuts against the paper is located in front of the rotation center line of the rubbing wheel 4. In the embodiment, the number of the rubbing wheels 4 is two, and the two rubbing wheels 4 are arranged on the wheel shaft in sequence, and the number of the clearance openings 7b is two.

[0041] Further, as shown in Figure 5 、 Figure 6 、 Figure 8 and Figure 9 , the pressing piece 8 is hingedly connected with the paper pressing plate assembly 5, and the pressing piece 8 swings under the action of the elastic member 9 to make the acting portion 8a swing downward and rearward. The pressing piece 8 is sheet-shaped and is arranged along the transverse direction, the front end of the pressing piece 8 is upwardly bent, the acting portion 8a is the bent portion of the pressing piece 8, the front end of the pressing piece 8 is downwardly inclined relative to the rear end when pressing the paper, the pressing piece 8 is a metal member and is specifically stainless steel, and the pressing piece 8 can swing under the action of the elastic member 9 to make the front end portion thereof abut against the front edge of the clearance opening 7b. The left and right ends of the pressing piece 8 have hinged portions 8b which are upwardly folded, the paper pressing plate assembly 5 is provided with two hinged ears 10 which are oppositely arranged along the left-right direction, the pressing piece 8 is located between the two hinged ears 10, and the pressing piece 8 is hingedly connected with the paper pressing plate assembly 5 through a hinged shaft 11 which penetrates through the hinged ears 10 and the hinged portions 8b. The rear end of the pressing piece 8 is provided with a tab which is downwardly bent to form a connecting portion 8c, the elastic member 9 is a tension spring, and the two ends of the tension spring are respectively connected with the paper pressing plate assembly 5 and the connecting portion 8c. The bottom of the paper pressing plate assembly 5 is provided with a paper pressing portion 7c which is protruding, the paper pressing portion 7c is strip-shaped and is arranged along the left-right direction, the paper pressing portion 7c falls into the inner side of the paper inlet 1b2 along the vertical direction, and the paper pressing portion 7c is specifically formed by downwardly folding the front side edge of the paper passing opening 7a. Of course, the paper pressing portion 7c can also be formed by downwardly folding the rear side edge of the paper passing opening 7a.

[0042] Specifically, as shown in Figure 5 , Figure 7 , Figure 8 and Figure 9 , the paper pressing plate assembly 5 comprises a plate body 7 and at least two guide columns 12 fixedly connected to the plate body 7 in the vertical direction, the guide columns 12 are divided into two groups, a paper passing opening 7a is located between the two groups of guide columns 12, a gap opening 7b, a hinged lug 10 and the paper passing opening 7a are all located on the plate body 7, a guide block 13 is sleeved on each guide column 12, an anti-falling gasket one is fixedly connected to the upper end of each guide column 12 by a fastener, the number of paper pressing springs 6 is consistent with the number of guide columns 12, each paper pressing spring 6 is sleeved on each guide column 12, the two ends of each paper pressing spring 6 abut against the paper pressing plate assembly 5 and the lower side of the guide block 13 respectively, and the upper side of the guide block 13 abuts against the anti-falling gasket one. The inner top wall of the machine cover 2 is fixedly connected with a plurality of connecting columns 14 in the vertical direction, each connecting column 14 passes through each guide block 13 respectively, and the lower end of each connecting column 14 is fixedly provided with an anti-falling gasket two by a fastener, the anti-falling gasket two abuts against the lower side of the guide block 13 when the machine cover 2 is opened. The plate body 7 is further fixedly connected with a guide seat 15, the guide seat 15 is provided with a paper guiding passage 15a in the vertical direction, the lower end of the paper guiding passage 15a is connected with the paper passing opening 7a, and the upper end of the paper guiding passage 15a is trumpet-shaped.

[0043] In the automatic paper shredding mode, the paper stack is placed in the paper slot 1b1 and the machine cover 2 is closed. The bottom of the paper pressing plate assembly 5 is provided with a notch 7b, which is located opposite the paper roller 4 when the machine cover 2 is closed, i.e. the notch 7b is used for the paper roller 4 to be inserted. Thus, the bottom of the paper pressing plate assembly 5 is pressed on the paper when the machine cover 2 is closed, and the paper is formed into an arch at the paper roller 4 and into the notch 7b. Conventionally, the notch 7b is not provided on the bottom of the paper pressing plate assembly 5 for the paper roller 4 to be inserted, so that the paper pressing plate assembly 5 can be pressed on the paper. This is because the paper is formed into an arch into the notch 7b as described above, and the paper roller 4 rotates to further bend the paper upward into the notch 7b when the paper is pressed by the paper pressing plate assembly 5, which results in the paper not being smoothly transported. In this case, the pressing member 8 is hinged on the paper pressing plate assembly 5, and the pressing member 8 has an acting portion 8a. The elastic member 9 is provided between the pressing member 8 and the paper pressing plate assembly 5, and the acting portion 8a is moved downward into the notch 7b under the action of the elastic member 9. Thus, the arch of the paper is in contact with the acting portion 8a of the pressing member 8, and the contact position between the acting portion 8a and the paper is located in front of the rotation center line of the paper roller 4 when the machine cover 2 is closed and the paper slot 1b1 is empty. When the paper slot 1b1 has paper, the contact position between the acting portion 8a and the paper is also located in front of the rotation center line of the paper roller 4, i.e. the contact position between the acting portion 8a and the arch of the paper is in front of the arch, and the pressing member 8 exerts a downward force on the rear part of the arch of the paper under the action of the elastic member 9. Thus, the paper is transported in a forward and downward direction, which ensures that the paper is naturally bent into the paper inlet 1b2 when the paper is transported forward, and improves the reliability of the automatic paper feeding.

[0044] In order to better understand the working principle, the paper slot 1b1 is divided into a front region and a rear region by the paper inlet 1b2, and the paper roller 4 is located in the rear region. That is, the front part of the paper is pressed in the front region of the paper slot 1b1 by the paper pressing plate assembly 5, and the rear part of the paper is pressed in the rear region of the paper slot 1b1 by the paper pressing plate assembly 5. The paper roller 4 is in contact with the rear part of the lowermost paper, and the front part of the lowermost paper remains stationary when the paper roller 4 starts to rotate. The rear part of the lowermost paper is rubbed forward by the friction force of the paper roller 4, and the paper is bent into the paper inlet 1b2 by the action of the pressing member 8. When the bent part of the paper contacts the paper shredding mechanism 3, the paper shredding mechanism 3 exerts a pulling force on the paper, which pulls the whole paper.

[0045] Embodiment Two

[0046] The embodiment is basically same as the structure and principle of the embodiment one, and the difference is that the elastic member 9 is a torsion spring in the embodiment, the torsion spring is arranged on the hinge shaft 11, and the two ends of the torsion spring are respectively abutted with the paper pressing plate assembly 5 and the pressing member 8.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art can make various modifications or supplements to the specific embodiments described or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A paper shredder, comprising a body (1) with a paper feeding trough (1b1) recessed downwards at the top, and a cover (2) hinged to the top of the body (1) and operable to be opened by flipping, wherein the bottom wall of the paper feeding trough (1b1) is provided with a paper inlet (1b2), and a paper feeding roller (4) is provided inside the top of the body (1) near the rear of the paper inlet (1b2), the top of the paper feeding roller (4) being higher than the bottom wall of the paper feeding trough (1b1), and a pressure plate assembly (5) is slidably connected to the inner side of the cover (2) in the vertical direction, and a pressure spring (6) is provided between the two, characterized in that, The bottom of the pressing board assembly (5) is provided with a relief opening (7b). The upper side of the pressing board assembly (5) is movably connected to a pressing member (8). The pressing member (8) has an action part (8a). An elastic member (9) is provided between the pressing member (8) and the pressing board assembly (5). Under the action of the elastic member (9), the pressing member (8) moves so that the action part (8a) enters the relief opening (7b) downward. When the machine cover (2) is closed and there is no paper in the paper tray (1b1), the paper feeding roller (4) enters the relief opening (7b) and abuts against the action part (8a). In this state, the contact position between the action part (8a) and the paper feeding roller (4) is located in front of the rotation center line of the paper feeding roller (4).

2. A paper shredder according to claim 1, characterized in that, The pressing member (8) is hinged to the pressure plate assembly (5), and the pressing member (8) swings downward and backward under the action of the elastic member (9).

3. A paper shredder according to claim 2, characterized in that, The pressing member (8) is sheet-shaped and arranged laterally. The front end of the pressing member (8) is bent upward. The working part (8a) is the bent part of the pressing member (8). The pressing member (8) can swing under the action of the elastic member (9) until its front end abuts against the front edge of the relief opening (7b).

4. A paper shredder according to claim 3, characterized in that, The pressing member (8) has an upwardly folded hinge portion (8b) at both ends. The pressure plate assembly (5) is provided with two hinge ears (10). The two hinge ears (10) are arranged opposite each other in the left and right direction. The pressing member (8) is located between the two hinge ears (10). The pressing member (8) and the pressure plate assembly (5) are hinged to each other by a hinge shaft (11) that passes through the hinge ears (10) and the hinge portion (8b).

5. A paper shredder according to claim 4, characterized in that, The rear end of the pressing member (8) is provided with a protrusion, which is bent downward to form a connecting part (8c). The elastic member (9) is a tension spring, and the two ends of the tension spring are respectively connected to the pressing paper assembly (5) and the connecting part (8c).

6. A paper shredder according to claim 4, characterized in that, The elastic element (9) is a torsion spring, which is mounted on the hinge shaft (11). The two ends of the torsion spring abut against the pressure plate assembly (5) and the pressing element (8), respectively.

7. A paper shredder according to claim 1, 2, 3, or 4, characterized in that, The paper pressing assembly (5) has a paper pressing part (7c) protruding from the bottom. The paper pressing part (7c) is strip-shaped and arranged in the left-right direction. The paper pressing part (7c) is located above the paper inlet (1b2).

8. A paper shredder according to claim 7, characterized in that, The machine cover (2) is provided with a manual paper feeding port (2a), and the paper pressing assembly (5) is provided with a paper feeding port (7a). The paper feeding port (7a) is located above the paper inlet (1b2), and the manual paper feeding port (2a) is located above the paper feeding port (7a). The paper pressing part (7c) is formed by folding down the front side of the paper feeding port (7a).

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