Paper shredder

Abstract

The utility model provides a paper shredder and belongs to the technical field of office supplies. The problem that the paper separation effect is not stable is solved. The paper conveying device comprises a machine shell, a paper twisting wheel, a paper supporting plate and a knife tackle assembly, the paper twisting wheel, the paper supporting plate and the knife tackle assembly are arranged in the machine shell, a paper guiding platform is arranged in the machine shell, the front end of the paper guiding platform is in butt joint with the knife tackle assembly, the paper supporting plate is located behind the paper guiding platform, and the front end of the paper supporting plate is located on the lower rear side of the paper twisting wheel; the upper side of the rear end of the paper guiding platform is provided with a groove which is concave downwards, the paper separating part is partially located in the groove, an acting spring is arranged between the groove bottom wall of the groove and the paper separating part in an abutting mode, the groove bottom wall of the groove is provided with a through hole, the bottom of the paper separating part is provided with a connecting column, the connecting column penetrates through the through hole, and the paper separating part is connected with the paper guiding platform through the connecting column. The lower end of the connecting column is connected with an anti-disengaging piece, the anti-disengaging piece protrudes out of the outer side wall of the connecting column, and a gap is formed between the anti-disengaging piece and the face where the lower end hole opening of the through hole is located. The paper separating device has the advantages of stable paper separating effect and the like.

Description

Technical field

[0001] The utility model belongs to the technical field of office supplies and relates to a paper shredder. Background technique

[0002] A paper shredder is a commonly used office supply, which is used to shred waste documents. Traditional paper shredders only have the function of manual paper shredding. Each time, only one or two pieces of paper can be manually put in for shredding. Therefore, it is very inconvenient for shredding a large number of papers at one time. For this reason, the Chinese patent discloses an automatic paper-feeding paper shredder with a paper cleaning structure, with the patent application number 202221562781.X. It includes a machine housing with an upper port cover equipped with an upper cover. A fixed seat is provided in the upper port of the machine housing. Below the front end of the fixed seat, there is a cutter group assembly for shredding paper. An automatic paper-feeding mechanism is provided on the fixed seat. The automatic paper-feeding mechanism includes a paper support plate elastically and obliquely installed on the fixed seat and a paper feed roller erected on the fixed seat to convey the paper on the paper support plate to the cutter group assembly for shredding through rolling friction. A manual paper shredding channel and an automatic paper shredding channel for guiding the paper to be shredded into the cutter group assembly are formed in the fixed seat. A paper separating structure is formed or installed on the fixed seat. The paper separating structure includes a paper separating flange for blocking a stack of papers on the paper support plate and a paper separating platform that cooperates with the paper feed roller to separate and guide the topmost paper in a stack of papers into the automatic paper shredding channel. When performing batch paper shredding, a stack of papers is placed on the paper support plate and pushed against the paper separating flange. Then, the paper feed roller rotates and, by means of friction, conveys the topmost paper into the cutter group assembly for shredding.

[0003] Through the setting of the paper separating structure, the situation of multiple pieces of paper being conveyed to the cutter group assembly by the paper feed roller at one time can be avoided, reducing the failure rate of the machine. Among them, the paper feed roller and the paper separating part are two independent components and only form a cooperation after assembly. However, due to the existence of production errors, the paper feed roller and the paper separating part cannot achieve the designed cooperation effect in practice, thus easily resulting in unstable paper separating effect. Summary of the utility model

[0004] The purpose of the utility model is to address the above problems existing in the prior art and propose a paper shredder, which solves the problem of unstable paper separating effect.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] The shredder comprises a casing and a paper pickup roller, a paper support plate and a knife group assembly all arranged in the casing, wherein the casing is provided with a paper guide platform, the front end of the paper guide platform is connected to the knife group assembly, the paper support plate is located behind the paper guide platform and the front end of the paper support plate is located at the rear and lower side of the paper pickup roller, and a paper separation member is provided on the upper side of the rear end of the paper guide platform, and the paper separation member abuts against the bottom of the paper pickup roller, and is characterized in that a downwardly concave groove is provided at the upper side of the rear end of the paper guide platform, the paper separation member is partially located in the groove, an action spring is provided between the bottom wall of the groove and the paper separation member, the bottom wall of the groove is provided with a through hole, the bottom of the paper separation member has a connecting column, the connecting column passes through the through hole, the lower end of the connecting column is connected to an anti-slip component, the anti-slip component protrudes from the outer wall of the connecting column, and there is a distance between the anti-slip component and the surface where the lower end opening of the through hole is located.

[0007] Similar to existing shredders, when this shredder needs to shred batches of paper, the user stacks the batches of paper into a pile, places it on the paper support, and pushes the paper forward until the front end of the paper contacts the paper separator. When the pickup roller rotates, the pickup roller uses friction to transport the top paper forward, and the remaining paper is blocked by the paper separator until the top paper is completely separated from the pickup roller. The pickup roller then contacts the next paper and generates friction on it, causing it to pass between the pickup roller and the paper separator (while the paper is being transported forward, the paper separator is subjected to a force that overcomes the elastic force of the spring and adaptively floats downward). This prevents a situation where a large amount of paper is transported by the pickup roller into the knife assembly for shredding at one time, causing machine malfunction.

[0008] This shredder is achieved by providing a downwardly concave groove at the upper rear end of the paper guide platform. The paper separating member is partially located in the groove and an action spring is provided between the bottom wall of the groove and the paper separating member. Under the action of the action spring, the paper separating member can always maintain a state of abutting against the bottom of the paper pickup wheel. In this way, it is possible to well control that there will never be a large gap between the paper separating member and the paper pickup wheel, eliminating the hidden danger of poor coordination between the paper separating member and the paper pickup wheel after installation due to production errors, thereby ensuring a stable paper separation effect in long-term use.

[0009] In addition, this shredder is provided with a connecting column at the bottom of the paper separating piece and a through hole on the bottom wall of the groove. After the paper separating piece is installed in the groove and the connecting column passes through the through hole, an anti-slip piece is connected to the lower end of the connecting column. In this way, the anti-slip piece can be used to ensure that the paper separating piece will not fall out of the groove as a whole during the assembly of the paper pickup wheel, thereby improving the convenience of assembly.

[0010] In the above-mentioned shredder, the paper separating member has a main body, the bottom of the main body has a hollow groove, the upper end of the connecting column is fixedly connected to the bottom wall of the hollow groove, the action spring is sleeved outside the connecting column and the upper end of the action spring rests on the bottom wall of the hollow groove.

[0011] The acting spring is sleeved outside the connecting column, which can position the acting spring to ensure that the elastic force of the acting spring can act on the paper separating member stably.

[0012] In the above-mentioned shredder, the main body is arranged in a long strip shape along the center line direction of the paper feeding roller, and the number of connecting columns is two. The two connecting columns are respectively located at both ends of the main body along the center line direction of the paper feeding roller.

[0013] The main body is arranged in a long strip shape along the center line direction of the paper feeding roller, which can increase the acting area of the paper separating member, thereby improving the paper separating effect.

[0014] In the above-mentioned shredder, the anti-detachment member is a screw. The connecting column is provided with a connecting hole along the vertical direction. The rod portion of the screw is threadedly connected in the connecting hole, the head of the screw abuts against the lower end surface of the connecting column, and the outer diameter of the head of the screw is larger than the aperture of the through hole.

[0015] After the paper separating member is placed in the groove and the connecting column passes through the through hole, a screw is fixedly connected to the lower end portion of the connecting column. Since the outer diameter of the head of the screw is larger than the aperture of the through hole, it can play a role in preventing the paper separating member from falling out of the groove during assembly.

[0016] In the above-mentioned shredder, as another technical solution, an annular groove is provided on the outer side of the lower end portion of the connecting column, the anti-detachment member is a snap ring, the inner edge of the snap ring is located in the annular groove, and the outer diameter of the snap ring is larger than the aperture of the through hole.

[0017] After the paper separating member is placed in the groove and the connecting column passes through the through hole, the snap ring is installed and fixedly connected to the outer side of the lower end portion of the connecting column. Since the outer diameter of the snap ring is larger than the aperture of the through hole, it can play a role in preventing the paper separating member from falling out of the groove during assembly.

[0018] In the above-mentioned shredder, there is a first gap between the bottom and the rear side of the main body, and a second gap is provided between the rear end face and the upper side face of the paper guiding platform. The second gap is communicated with the groove, and the rear side portion of the main body is located in the second gap.

[0019] During the process of feeding the paper forward through the paper guiding platform, the paper separating member will be subjected to a forward acting force. By providing a first swing gap between the outer side wall of the connecting column and the hole wall of the through hole and a second swing gap between the front side wall of the main body and the front side groove wall of the groove, when the paper separating member swings forward under the action of the force, it abuts against the front side wall of the main body through the front side groove wall of the groove, avoiding the connecting column of the paper separating member from being hard pressed and deformed after long-term use.

[0020] In the above-mentioned shredder, a first notch is provided between the bottom and the rear side of the main body, a second notch is provided between the rear end face and the upper side face of the paper guiding platform, the second notch is communicated with the groove, and the rear side portion of the main body is located in the second notch.

[0021] Since the paper separating member will swing forward under the action of a force, if there is no second notch, the gap between the swung paper separating member and the rear side wall of the groove will become larger, making it easy for the paper located below the paper being conveyed to get stuck between the swung paper separating member and the rear side wall of the groove, thus causing difficulties in subsequent paper conveyance.

[0022] This shredder sets a second notch between the rear end face and the upper side face of the paper guiding platform. The second notch communicates with the groove, which is equivalent to making the rear side of the groove open. Combining with the first notch set between the bottom and the rear side of the main body, the shape formed at the rear side of the main body can cooperate with the second notch, so that even if the paper separating member swings forward under force, the paper will not get stuck in the groove.

[0023] In the above-mentioned shredder, the top of the main body has a horizontally arranged abutting plane, and the rear side of the main body has a guiding surface. The upper end of the guiding surface is inclined forward relative to the lower end. The upper end of the guiding surface is connected to the abutting plane, and the lower end of the guiding surface is connected to the upper side wall inside the first notch.

[0024] The setting of the guiding surface enables the paper to be conveyed more smoothly backward after abutting against the main body of the paper separating member.

[0025] Compared with the prior art, this shredder has the following advantages:

[0026] 1. By setting a downwardly recessed groove at the upper side position of the rear end of the paper guiding platform, a part of the paper separating member is located in the groove, and a working spring is abutted between the bottom wall of the groove and the paper separating member. Under the action of the working spring, the paper separating member can always be kept in a state of abutting against the bottom of the paper feeding roller, so that a large gap between the paper separating member and the paper feeding roller can be well controlled, eliminating the hidden danger that the cooperation between the paper separating member and the paper feeding roller is not in place due to production errors after installation, thus ensuring a stable paper separating effect during long-term use.

[0027] 2. A connecting column is provided at the bottom of the paper separating member, and a through hole is provided on the bottom wall of the groove. After the paper separating member is inserted into the groove and the connecting column passes through the through hole, an anti-disengagement member is connected to the lower end of the connecting column, so that the anti-disengagement member can be used to ensure that the paper separating member will not completely come out of the groove during the assembly of the paper feeding roller, thereby improving the convenience of assembly. Brief Description of the Drawings

[0028] Figure 1 is a sectional view of this shredder.

[0029] Figure 2 is Figure 1Partial enlarged view of the paper pick-up roller and the paper separating member.

[0030] Figure 3 is Figure 1 Cross-sectional view taken along line A-A in [the figure].[[]END]]

[0031] Figure 4 is Figure 3 Partial enlarged view of the paper pick-up roller and the paper separating member.

[0032] Figure 5 Isometric schematic diagram of the paper separating member.

[0033] Figure 6 Isometric schematic diagram of the paper separating member from another angle.

[0034] In the figure, 1. Machine housing; 1a. Automatic shredding paper feeding port; 1b. Manual shredding paper feeding port; 2. Paper guiding platform; 2a. Groove; 2b. Through hole; 2c. Second notch; 3. Paper pick-up roller; 4. Knife set assembly; 4a. Outer shell; 4a1. Paper feeding port; 4b. Knife shaft; 4c. Shredding knife; 5. Paper supporting plate; 6. Supporting spring; 7. Paper passing channel; 8. Paper separating member; 8a. Connecting column; 8a1. Connecting hole; 8b. Main body; 8b1. Hollow groove; 8b2. First notch; 8b3. Abutting plane; 8b4. Guiding surface; 9. Acting spring; 10. Anti-disengagement member. Detailed implementation manners

[0035] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0036] Embodiment 1

[0037] Such as Figure 1As shown, the shredder includes a housing 1, which contains a paper guide platform 2. A paper pickup roller 3 is connected to the housing 1 via a rotating shaft and is located above the front end of the paper guide platform 2. A knife assembly 4 is provided within the housing 1. The knife assembly 4 includes a housing 4a, a knife shaft 4b rotatably disposed within the housing 4a, and a shredder 4c fixed to the knife shaft 4b. The top of the housing 4a has a paper feed 4a1, and the front end of the paper guide platform 2 is connected to the paper feed 4a1. The top of the housing 1 has a square automatic shredding paper discharge port 1a. The housing 1 also includes a paper support plate 5 and a support spring 6. The rear end of the paper support plate 5 is hinged to the housing 1 and is located at the automatic shredding paper discharge port 1a. The front end of the paper support plate 5 is located below and behind the paper pickup roller 3. The upper end of the support spring 6 abuts against the front bottom of the paper support plate 5. The paper guide platform 2 is located in front of the paper support plate 5. The top of the housing 1 also features a manual paper feed slot, arranged in a strip along the left and right sides. This slot is located in front of the automatic shredding slot 1a. A paper feed channel 7 is located directly below the slot within the housing 1. The outlet of this channel communicates with the paper feed port 4a1. A drive motor is also housed within the housing 1. The motor's output shaft simultaneously drives the blade shaft 4b and the rotating shaft through a gear mechanism.

[0038] like Figures 1-6 As shown, a paper separator 8 is provided on the upper rear side of the paper guide platform 2, and the paper separator 8 abuts against the bottom of the paper pickup roller 3. A downwardly recessed groove 2a is provided at the upper rear side of the paper guide platform 2, and the paper separator 8 is partially located within the groove 2a. An action spring 9 is provided between the bottom wall of the groove 2a and the paper separator 8, and the bottom wall of the groove 2a has a through hole 2b. The bottom of the paper separator 8 has a connecting post 8a, which passes through the through hole 2b. The lower end of the connecting post 8a is connected to an anti-slip member 10, which protrudes from the outer side wall of the connecting post 8a and is spaced apart from the surface where the lower end opening of the through hole 2b is located. The paper separator 8 is made of ABS material and comprises a main body 8b having a hollow groove 8b1 at its bottom. The upper end of a connecting post 8a is fixedly connected to the bottom wall of the hollow groove 8b1. In practice, the main body 8b and the connecting post 8a are integrally formed. An action spring 9 is sleeved outside the connecting post 8a, with the ends of the action spring 9 respectively abutting against the bottom wall of the groove 2a and the bottom wall of the hollow groove 8b1 (the bottom wall refers to the wall facing the groove opening). The main body 8b is arranged in an elongated strip along the centerline of the pickup roller 3. The length of the main body 8b along the centerline of the pickup roller 3 is substantially the same as that of the pickup roller 3. There are two connecting posts 8a, and the number of through holes 2b corresponds to two. The two connecting posts 8a are located at the two ends of the main body 8b along the centerline of the pickup roller 3. Specifically, the anti-slip component 10 is a screw, and the connecting column 8a is provided with a connecting hole 8a1 along the vertical direction. The rod of the screw is threadedly connected in the connecting hole 8a1, and the head of the screw rests on the lower end surface of the connecting column 8a. The outer diameter of the head of the screw is larger than the outer diameter of the through hole 2b.

[0039] Further, as Figure 2 , Figure 5 and Figure 6 shown, there is a first swing gap between the outer sidewall of the connecting column 8a and the hole wall of the through hole 2b, and there is a second swing gap between the front sidewall of the main body 8b and the front side groove wall of the groove 2a. A first notch 8b2 is provided between the bottom and the rear side of the main body 8b, and a second notch 2c is provided between the rear end face and the upper side face of the paper guide platform 2. The second notch 2c communicates with the groove 2a, and the rear side portion of the main body 8b is located in the second notch 2c. The top of the main body 8b has a horizontally arranged abutting plane 8b3, and the rear side of the main body 8b has a guiding surface 8b4. The upper end of the guiding surface 8b4 is inclined forward relative to the lower end. The upper end of the guiding surface 8b4 is connected to the abutting plane 8b3, and the lower end of the guiding surface 8b4 is connected to the upper sidewall in the first notch 8b2. In practice, the guiding surface 8b4 is an arc surface, and there is a smooth transition between the guiding surface 8b4 and the abutting plane 8b3.

[0040] When it is necessary to shred a single sheet or several sheets of paper, the user directly puts the paper into the casing 1 from the manual paper feed port and enters the cutter group assembly 4 through the paper passage 7 for shredding. The user stacks a batch of papers into a stack and places them on the paper support plate 5 and pushes the papers forward until the front end of the papers contacts the paper separating member 8. When the paper feed roller 3 rotates, the paper feed roller 3 conveys the uppermost paper forward through friction. The remaining papers will be blocked by the paper separating member 8. Until the uppermost paper is completely separated from the paper feed roller 3, then the paper feed roller 3 contacts the next sheet of paper and also generates friction on it to make it pass between the paper feed roller 3 and the paper separating member 8, thereby avoiding the situation that a large number of papers are conveyed into the cutter group assembly 4 for shredding at one time, which may cause machine failures.

[0041] This shredder is provided with a downwardly recessed groove 2a at the upper side of the rear end of the paper guide platform 2. The paper separating member 8 is partially located in the groove 2a, and a working spring 9 is abutted between the bottom wall of the groove 2a and the paper separating member 8. Under the action of the working spring 9, the paper separating member 8 can always maintain a state of being abutted against the bottom of the paper feeding roller 3. In this way, a large gap between the paper separating member 8 and the paper feeding roller 3 can be well controlled, eliminating the hidden danger that the fit between the paper separating member 8 and the paper feeding roller 3 after installation is not in place due to production errors, thereby ensuring a stable paper separating effect during long-term use. In addition, during assembly, after the working spring 9 and the paper separating member 8 are placed in the groove 2a, the paper feeding roller 3 is then set inside the machine (if the paper feeding roller 3 is set first, the paper separating member 8 and the working spring 9 cannot be installed into the groove 2a). Then, when setting the paper feeding roller 3, it is necessary to ensure that the paper separating member 8 is not directly pushed out of the groove 2a by the working spring 9. For this purpose, a connecting column 8a is provided at the bottom of the paper separating member 8, and a through hole 2b is provided on the bottom wall of the groove 2a. The connecting column 8a passes through the through hole 2b and is connected with an anti-disengagement member 10 at its lower end. In this way, the anti-disengagement member 10 can be used to ensure that the paper separating member 8 does not completely come out of the groove 2a during the assembly of the paper feeding roller 3, thereby improving the convenience of assembly.

[0042] Embodiment 2

[0043] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that: in this embodiment, an annular groove is provided on the outer side of the lower end of the connecting column 8a, and the anti-disengagement member 10 is a snap ring. The inner edge of the snap ring is located in the annular groove, and the outer diameter of the snap ring is larger than the aperture of the through hole 2b.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A paper shredder, comprising a housing (1) and a paper pickup roller (3), a paper support plate (5) and a knife assembly (4) all arranged in the housing (1), wherein the housing (1) is provided with a paper guide platform (2), the front end of the paper guide platform (2) is in contact with the knife assembly (4), the paper support plate (5) is located behind the paper guide platform (2) and the front end of the paper support plate (5) is located at the rear lower side of the paper pickup roller (3), a paper separation member (8) is provided on the upper side of the rear end of the paper guide platform (2), and the paper separation member (8) abuts against the bottom of the paper pickup roller (3), and is characterized in that: At the upper side position of the rear end of the paper guiding platform (2), there is a downwardly recessed groove (2a). The paper separating member (8) is partially located in the groove (2a). A working spring (9) is provided between the bottom wall of the groove (2a) and the paper separating member (8) in a abutting manner. A through hole (2b) is provided on the bottom wall of the groove (2a). The bottom of the paper separating member (8) has a connecting post (8a). The connecting post (8a) passes through the through hole (2b). A retaining member (10) is connected to the lower end of the connecting post (8a). The retaining member (10) protrudes from the outer side wall of the connecting post (8a). There is a spacing between the retaining member (10) and the plane where the lower end orifice of the through hole (2b) is located.

2. The paper shredder according to claim 1, characterized in that, The paper separating member (8) has a main body (8b). The bottom of the main body (8b) has a hollowed-out groove (8b1). The upper end of the connecting post (8a) is fixedly connected to the bottom wall of the hollowed-out groove (8b1). The working spring (9) is sleeved outside the connecting post (8a) and the upper end of the working spring (9) abuts against the bottom wall of the hollowed-out groove (8b1).

3. The shredder according to claim 2, characterized in that, The main body (8b) is arranged in a long strip shape along the center line direction of the paper feeding roller (3). The number of the connecting posts (8a) is two. The two connecting posts (8a) are respectively located at both ends of the main body (8b) along the center line direction of the paper feeding roller (3).

4. The shredder according to claim 2 or 3, characterized in that, The retaining member (10) is a screw. A connecting hole (8a1) is provided on the connecting post (8a) in the vertical direction. The rod portion of the screw is threadedly connected in the connecting hole (8a1). The head of the screw abuts against the lower end surface of the connecting post (8a). The outer diameter of the head of the screw is larger than the aperture of the through hole (2b).

5. The shredder according to claim 2 or 3, characterized in that, An annular groove is provided on the outer side of the lower end of the connecting post (8a). The retaining member (10) is a circlip. The inner edge of the circlip is located in the annular groove. The outer diameter of the circlip is larger than the aperture of the through hole (2b).

6. The shredder according to claim 2 or 3, characterized in that There is a first swing gap between the outer side wall of the connecting post (8a) and the hole wall of the through hole (2b). There is a second swing gap between the front side wall of the main body (8b) and the front side groove wall of the groove (2a).

7. The shredder according to claim 6, characterized in that, A first notch (8b2) is provided between the bottom and the rear side of the main body (8b). A second notch (2c) is provided between the rear end face and the upper side face of the paper guiding platform (2). The second notch (2c) is communicated with the groove (2a). The rear side part of the main body (8b) is located in the second notch (2c).

8. The shredder according to claim 7, characterized in that, The top of the main body (8b) has a horizontally arranged abutting plane (8b3). The rear side of the main body (8b) has a guiding surface (8b4). The upper end of the guiding surface (8b4) is inclined forward relative to the lower end. The upper end of the guiding surface (8b4) is connected to the abutting plane (8b3). The lower end of the guiding surface (8b4) is connected to the upper side wall in the first notch (8b2).

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