Novel blade group of paper shredder

Abstract

The utility model discloses a novel blade group of a paper shredder, which is formed by superposing a blade A and a blade B. The blade A and the blade B respectively comprise a metal disc body, the outer edge of the metal disc body is uniformly provided with at least two sharp-tooth blades, and the metal disc body at the front side position of the circumferential rotation of each sharp-tooth blade is provided with a convex platform part. The center of the metal disc body is provided with an axis hole for the cutter shaft to penetrate through, the axis hole and the cutter shaft are provided with matched limiting structures, and the cutter shaft rotates in the circumferential direction to drive the blade set to rotate in the circumferential direction. Through the arrangement of the convex platform part, the strength of the sharp-tooth blade is enhanced, and the thickness of the material at the bottom of the sharp-tooth blade is increased through the convex platform part, so that the sharp-tooth blade can better resist fracture and abrasion when being subjected to paper shearing force, and the durability of the blade is improved. And the raised front end of the raised platform part can quickly push broken paper scraps and the like into a scrap recovery box of the paper shredder, so that residual paper scraps on the sharp-tooth blade are reduced, and continuous and smooth paper shredding work is realized.

Description

Technical Field

[0001] This disclosure relates to the field of paper shredder blade technology, and more particularly to a novel blade assembly for a paper shredder. Background Technology

[0002] The core of a paper shredder consists of two sets of metal blades and an electric motor. The motor drives the two sets of blades to rotate at high speed in opposite directions via a belt or gear transmission system. The sharp, pointed blades on the blades cut or tear the paper. In existing paper shredders, the pointed blades on the circular blades are both sharp and thin. Due to the limitation of the strength of these pointed blades, paper shredders typically have a set feed size for a single batch of shredded paper. Exceeding this size for an extended period can accelerate the dulling or breakage of the pointed blades. Furthermore, the design of the existing blades' pointed blades, if not sharp enough, allows shredded paper to remain on the blades, increasing the risk of paper jams and clogging. Therefore, the design of the blades on the existing paper shredder blades needs to be optimized and improved to increase the strength of the pointed blades and prevent paper residue from remaining on the blades. Utility Model Content

[0003] To achieve the above objectives, this disclosure proposes a novel blade assembly for a paper shredder, which primarily enhances the strength of the sharp teeth on the blades and prevents paper scraps from remaining on the sharp teeth.

[0004] According to one aspect of this disclosure, a novel blade assembly for a paper shredder is provided, comprising blade A and blade B stacked together. Blade A and blade B each include a metal disc body. At least two sharp teeth are evenly provided on the outer edge of the metal disc body. A raised platform portion is provided on the metal disc body at the front position of the circumferential rotation of each sharp tooth. A central hole for a cutter shaft to pass through is provided in the center of the metal disc body. The central hole and the cutter shaft are provided with a matching limiting structure. The circumferential rotation of the cutter shaft drives the blade assembly to rotate circumferentially.

[0005] Preferably, the edges of the metal disk bodies of blades A and B are positioned away from the pointed cutting edge and the raised platform portion, and are designated as edge cutting edge portions.

[0006] Furthermore, the edge cutting edge of the blade A and blade B is formed by punching the inner edge of the overlapping blade A and blade B towards the outer edge at an angle.

[0007] Preferably, the raised platform portion protrudes from the outer edge of the metal disk body by a height of 0.5mm ± 0.3mm.

[0008] Furthermore, the pointed cutting edge includes a front tooth wall and a rear tooth wall, the front tooth wall and the rear tooth wall forming a pointed tooth with an acute angle, and the rear tooth wall has a chamfered wall on the inner side facing the overlapping of the blade A and the blade B, the chamfered wall forming the pointed teeth of the front tooth wall and the rear tooth wall into a pointed cutting edge.

[0009] Preferably, the limiting structure adopts a polygonal cutter shaft, and the corresponding shaft hole is a polygonal hole.

[0010] Preferably, the metal disk body of blade A has a positioning protrusion on the side that overlaps with blade B, and the metal disk body of blade B has a corresponding positioning through hole. The positioning protrusion is inserted into the positioning through hole so that when blade A and blade B are overlapped, the sharp edges of blade A and blade B are positioned opposite each other.

[0011] Preferably, the axial holes of blade A and blade B are provided with raised axial hole walls that extend outward on the other side of the overlapping connection between blade A and blade B.

[0012] Preferably, the metal disk body of the blade A is provided with a positioning protrusion on the side corresponding to the outer periphery of the protruding shaft hole wall and overlapping with the blade B, and the metal disk body of the blade B is provided with a positioning through hole. The positioning protrusion is inserted into the positioning through hole so that when the blades A and B are overlapped, the sharp edges of the blades A and B are positioned opposite each other.

[0013] The novel blade assembly for a paper shredder disclosed in this technical solution offers several advantages. Firstly, the metal disc body at the front of the circumferentially rotating front side of the serrated edges of blades A and B features a raised platform. This raised platform enhances the strength of the serrated edges by increasing the material thickness at the base, thus improving resistance to breakage and wear under paper shearing forces and enhancing blade durability. Secondly, the rapidly rotating front of the raised platform during shredding quickly pushes the shredded paper scraps into the shredder's waste bin, reducing paper residue on the serrated edges and ensuring continuous, smooth shredding. Therefore, this blade assembly design improves the performance of the paper shredder. Attached Figure Description

[0014] Figure 1 This is an exploded view of the structure of blade A and blade B in Embodiment 1 of this utility model.

[0015] Figure 2 This is a schematic diagram of the stacked state of blade A and blade B in Embodiment 1 of this utility model.

[0016] Figure 3 for Figure 2 Enlarged view of the structure at point D in the image.

[0017] Figure 4 This is a front view of blade A in Embodiment 1 of this utility model.

[0018] Figure 5 This is an exploded view of the blade A and blade B in Embodiment 2 of this utility model.

[0019] Figure 6 This is a schematic diagram of the stacked state of blade A and blade B in Embodiment 2 of this utility model.

[0020] Figure 7 This is an exploded view of the structure of blade A and blade B in Embodiment 3 of this utility model.

[0021] Figure 8 This is a left view of the stacked state of blade A and blade B in Embodiment 3 of this utility model.

[0022] Figure 9 This is an exploded view of the structure of blade A and blade B in Embodiment 4 of this utility model.

[0023] Figure 10 This is a schematic diagram of the stacked state of blade A and blade B in Embodiment 4 of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Metal disc body; 101. Pointed tooth cutting edge; 1011. Front tooth wall; 1012. Rear tooth wall; 1013. Beveled wall; 1014. Pointed cutting edge; 102. Raised platform; 103. Shaft hole; 104. Edge cutting edge; 105. Positioning protrusion; 106. Positioning through hole; 107. Raised shaft hole wall. Detailed Implementation

[0026] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this disclosure.

[0027] Example 1

[0028] Please refer to Figures 1 to 4This is the first embodiment of a novel blade assembly for a paper shredder disclosed in this technical solution. In this embodiment, the blade assembly is composed of blade A and blade B stacked together. Both blade A and blade B include a metal disc body 1. At least two sharp teeth 101 are evenly provided on the outer edge of the metal disc body 1. A raised platform portion 102 is provided on the front side of the circumferential rotation of each sharp tooth 101 on the metal disc body 1. A central hole 103 for passing through the blade shaft is provided in the center of the metal disc body 1. The central hole 103 and the blade shaft are provided with a matching limiting structure. The circumferential rotation of the blade shaft drives the blade assembly to rotate circumferentially.

[0029] In the first embodiment, preferably, the edges of the metal disc bodies 1 of blades A and B are positioned away from the sharp toothed blades 101 and the raised platform portion 102 and are set as edge blade portions 104, so that the paper shredder is more efficient by cutting paper synchronously through the edge blade portions 104.

[0030] As a preferred embodiment of the edge cutting edge 104 structure, the edge cutting edge 104 of blades A and B is formed by punching the inner edge of blades A and B overlapping to the outer edge at an angle. When blades A and B are assembled on the cutter shaft, the edge cutting edge 104 of blades A and B forms a "V" shaped groove with higher sides and a lower middle. Paper scraps driven by the raised platform 102 are carried from this "V" shaped groove into the paper scrap collection box of the shredder.

[0031] Preferably, the raised platform portion 102 protrudes from the outer edge of the metal disc body 1 at a height of 0.5mm ± 0.3mm. The protrusion height of the raised platform portion 102 is set within the above parameter range. If it is set too high, it will hit the paper during the shredding process, resulting in more noise and affecting the user experience.

[0032] Furthermore, the sharp toothed blade 101 includes a front toothed wall 1011 and a rear toothed wall 1012, the front toothed wall 1011 and the rear toothed wall 1012 forming sharp teeth with acute angles, the rear toothed wall 1012 having a beveled wall 1013 on the inner side facing the overlapping of the blade A and the blade B, the beveled wall 1013 forming the sharp teeth of the front toothed wall 1011 and the rear toothed wall 1012 into a sharp cutting edge 1014, the sharp cutting edge 1014 being used to cut and shred the paper to be shredded.

[0033] Preferably, the limiting structure adopts a polygonal cutter shaft, and the corresponding shaft hole 103 is a polygonal hole.

[0034] In this embodiment, a raised platform portion 102 is provided on the metal disc body 1 at the front position of the circumferentially rotating front side of the toothed blades 101 of blades A and B in the blade assembly. The raised platform portion 102 enhances the strength of the toothed blades 101 and increases the material thickness at the bottom of the toothed blades 101, allowing them to better resist breakage and wear when subjected to paper shearing force, thereby improving the blades' durability. Furthermore, the front end of the raised platform portion 102, when rotated rapidly during shredding, can quickly push the shredded paper scraps into the shredder's scrap collection bin, reducing paper scrap residue on the toothed blades 101 and achieving continuous and smooth shredding. Therefore, this blade assembly design helps improve the performance of the shredder.

[0035] Example 2

[0036] Please refer to Figure 5 , Figure 6 This embodiment is an extension of Embodiment 1. Its main feature is that the metal disc body 1 of blade A has a positioning protrusion 105 on the side where it overlaps with blade B. The metal disc body 1 of blade B has a corresponding positioning through hole 106. The positioning protrusion 105 is inserted into the positioning through hole 106, so that when blades A and B are overlapped, the sharp edges 101 of blades A and B are positioned opposite each other. When assembling the blade assembly onto the cutter shaft, the positioning and overlapping connection of blades A and B can be quickly achieved, thus facilitating the assembly of the blade assembly.

[0037] Example 3

[0038] Please refer to Figure 7 , Figure 8 This embodiment is an extension of Embodiment 1. Its main feature is that on the opposite side of the axial bore 103 of blades A and B, there are raised axial bore walls 107 extending outwards from the axial bore 103. Through these raised axial bore walls 107, after blades A and B are stacked and assembled, the raised axial bore walls 107 on both sides form a spacing between the blade assemblies assembled on adjacent sides. These raised axial bore walls 107 act as a spacer, eliminating the need for spacer rings, saving on component assembly, and improving assembly efficiency.

[0039] Example 4

[0040] Please refer to Figure 9 , Figure 10This embodiment is an extension of embodiments two and three. Its main feature is that a positioning protrusion 105 is provided on the side of the metal disk body 1 of blade A corresponding to the outer periphery of the protruding shaft hole wall 107 and overlapping with blade B. A positioning through hole 106 is provided on the metal disk body 1 of blade B. The positioning protrusion 105 is inserted into the positioning through hole 106, so that when blades A and B are overlapped, the sharp edges 101 of blades A and B are positioned opposite each other. This embodiment combines the beneficial effects of embodiments two and three.

[0041] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A novel blade assembly for a paper shredder, comprising blade A and blade B stacked together, characterized in that, Both blade A and blade B include a metal disc body. The outer edge of the metal disc body is uniformly provided with at least two sharp teeth. Each sharp tooth has a raised platform on the front side of the metal disc body at the circumferential rotation position. The center of the metal disc body is provided with a central hole for the cutter shaft to pass through. The central hole and the cutter shaft are provided with matching limiting structures. The circumferential rotation of the cutter shaft drives the blade assembly to rotate circumferentially.

2. The novel blade assembly of the paper shredder according to claim 1, characterized in that, The edges of the metal disc bodies of blades A and B, avoiding the pointed cutting edge and the raised platform portion, are designated as edge cutting edges.

3. The novel blade assembly of the paper shredder according to claim 2, characterized in that, The edge cutting edge of blade A and blade B is formed by pressing the inner edge of blade A and blade B together to the outer edge at an angle.

4. The novel blade assembly of the paper shredder according to claim 1, characterized in that, The raised platform protrudes from the outer edge of the metal disk body by a height of 0.5mm ± 0.3mm.

5. The novel blade assembly of the paper shredder according to claim 1, characterized in that, The sharp tooth includes a front tooth wall and a rear tooth wall, the front tooth wall and the rear tooth wall forming a sharp tooth at an acute angle, the rear tooth wall having a chamfered wall on the inner side facing the overlapping of the blade A and the blade B, the chamfered wall forming the sharp tooth of the front tooth wall and the rear tooth wall into a sharp cutting edge.

6. The novel blade assembly of the paper shredder according to claim 1, characterized in that, The limiting structure adopts a polygonal cutter shaft, and the corresponding shaft hole is a polygonal hole.

7. The novel blade assembly of the paper shredder according to any one of claims 1-6, characterized in that, The metal disc body of blade A has a positioning protrusion on the side that overlaps with blade B, and the metal disc body of blade B has a corresponding positioning through hole. The positioning protrusion is inserted into the positioning through hole so that the sharp edges of blade A and blade B are positioned opposite each other when blade A and blade B are overlapped.

8. The novel blade assembly of the paper shredder according to any one of claims 1-6, characterized in that, Both blade A and blade B have a raised shaft hole wall extending outward on the other side of the blade A and blade B that are stacked and connected.

9. The novel blade assembly of the paper shredder according to claim 8, characterized in that, The metal disc body of blade A is provided with a positioning protrusion on the outer periphery of the protruding shaft hole wall and on the side that overlaps with blade B. The metal disc body of blade B is provided with a positioning through hole. The positioning protrusion is inserted into the positioning through hole so that the sharp edges of blade A and blade B are in opposite positions when blade A and blade B are overlapped.

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