CN209866221U - Blade of paper shredder - Google Patents

Abstract

The utility model relates to the technical field of paper shredders, in particular to a paper shredder blade which can prevent paper scraps from being wound on a cutter tip. It includes: the cutter comprises a blade main body, wherein a cutter shaft hole matched with the cutter shaft is formed in the center of the blade main body, a cutter point used for cutting paper is arranged on the outer edge of the blade main body, a convex hull matched with the cutter point on the other blade is arranged on the outer edge of the blade main body, and the cross section of the convex hull is trapezoidal. Because the cross section of the convex hull is trapezoidal, and the top surface of the convex hull is a plane, when the paper is broken, the paper can be in a trapezoidal shape at the position of the convex hull under the action of extrusion force applied to the paper by the two groups of blades, and finally, a trapezoidal bending is formed at the local position on the paper scrap. The model formed by the shredded paper is easy to be led out of the lower part of the blade, and cannot be wound on the knife tip, so that the breaking rate of the blade is indirectly improved.

Description

Blade of paper shredder

The technical field is as follows:

the utility model relates to the technical field of paper shredders, in particular to a paper shredder blade which can prevent paper scraps from being wound on a cutter tip.

Background art:

a shredder is a commonly used office equipment for shredding waste paper documents, and in particular, a shredder can rapidly and safely destroy documents that need to be kept confidential.

The traditional paper shredder mainly comprises a motor, a gear system and a paper shredding cutter, wherein power is provided with a certain torque by the motor, the torque is amplified by the gear system and then transmitted to the paper shredding cutter to enable the paper shredding cutter to rotate, at the moment, paper which is not more than a rated quantity can be put into the paper inlet from a manual paper feeding port, the paper shredding cutter can grasp the paper and shred the paper into a shredded shape, and the paper is put into the paper shredder again after being shredded, so that the purpose of shredding the paper is achieved.

Referring to fig. 1, this is a shredding type blade commonly used in current paper shredders, which includes: the cutter body 1 is provided with a cutter shaft hole 11 through which a cutter shaft penetrates at the center of the cutter body 1, and a cutter point 13 is uniformly formed on a cutter edge part 12 at the outer edge of the cutter body 1. During the paper shredding process, as shown in fig. 2, the blades 1 on the left and right knife shafts 21, 22 are staggered with each other, and the paper is cut into shredded paper strips by the knife edge 12. The function of the transition point 13 is to break the paper, thereby breaking the paper into fine pieces. When the cutting edge 13 cuts a sheet, the angle in the tangential direction between the point of the cutting edge 13 and the cutting edge portion 12 of the other blade is too small, and therefore, the sheet may be difficult to cut. To increase the rate of penetration, a convex hull 14 is typically provided on the peripheral cutting edge portion 12, and the convex hull 14 will engage the cutting edge of another blade. Generally, the convex hull 14 is generally triangular, and the convex hull 14 supports the paper, so that the cutting edge of the other blade forms a nearly vertical insertion angle for the paper, and the paper can be easily inserted and cut off. However, in actual production, the triangular convex hull 14 raises the breaking rate of the paper, and forms a new problem. Since the convex hull 14 is designed to be triangular, the top of the convex hull 14 forms a tip, which causes the shredded paper to form a "V" bend, resulting in some portion of the finally shredded paper scrap forming a "V". The V-shaped shredded paper is easy to wind on the cutter tip due to the shape of the V-shaped shredded paper, and after a period of time, the cutter tip is wrapped by the V-shaped shredded paper, so that the cutter tip cannot continue to work, and the breaking rate of the paper shredder is rapidly reduced.

In view of the above problems, the present inventors have made improvements and have proposed the following solutions.

The utility model has the following contents:

the utility model aims to solve the technical problem that the defects of the prior art are overcome, and a paper shredder blade capable of preventing paper scraps from being wound on a knife tip is provided.

In order to solve the technical problem, the utility model discloses a following technical scheme: a shredder blade, comprising: the cutter comprises a blade main body, wherein a cutter shaft hole matched with the cutter shaft is formed in the center of the blade main body, a cutter point used for cutting paper is arranged on the outer edge of the blade main body, a convex hull matched with the cutter point on the other blade is arranged on the outer edge of the blade main body, and the cross section of the convex hull is trapezoidal.

Further, in the above technical solution, the number of the knifepoints on the insert body is the same as the number of the convex hulls.

After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses a convex closure does not take traditional triangular modeling, but improves and is trapezoidal cross-sectional modeling. Because the cross section of the convex hull is trapezoidal, and the top surface of the convex hull is a plane, when the paper is broken, under the action of extrusion force applied to the paper by the two groups of blades, the paper can form a trapezoidal shape at the position of the convex hull, and a trapezoidal bending is formed at the local position of the finally formed paper scrap. The model formed by the shredded paper is easy to be led out of the lower part of the blade, and cannot be wound on the knife tip, so that the breaking rate of the blade is indirectly improved.

Description of the drawings:

FIG. 1 is a schematic view of a prior art blade;

FIG. 2 is a schematic representation of the operation of a prior art blade;

fig. 3 is a schematic structural view of the blade of the present invention;

fig. 4 is a schematic view of the operation of the blade of the present invention.

The specific implementation mode is as follows:

the present invention will be further described with reference to the following specific embodiments and accompanying drawings.

See fig. 3 and 4, the utility model relates to a shredder blade, which comprises: a blade body 3. The blade main body 3 is circular, a blade shaft hole 4 matched with the blade shaft 2 is formed in the center of the blade main body, and a blade tip 5 used for cutting paper and a convex hull 6 matched with the blade tip on the other blade are arranged on the outer edge of the blade main body 3. The convex hull 6 is trapezoidal in cross section. Referring to fig. 4, the convex hull 6 with a trapezoidal cross section has a front inclined surface 61 as a cut surface for cutting the paper sheet along the rotation direction during operation. When the cutter is in operation, when the inclined surfaces 61 on the left and right groups of blades are intersected with the cutter point 5 on the other blade, the included angle A between the cutter point 5 and the binding end surface is kept to be close to 90 degrees as much as possible, so that the binding breaking moment is improved, and the energy consumption is reduced.

The utility model discloses in, knife tip 5 quantity on the blade main part 3 is the same with 6 quantity of convex closure, is two.

As shown in fig. 4, the utility model is operated, two sets of blades are respectively installed on two knife shafts 2. In the paper shredding process, the blade main bodies 3 of the blades on the left and right cutter shafts 2 are mutually staggered, and paper is cut into shredded paper strips through the staggered outer edges of the blade main bodies 3. The function of the transition point 5 is to break the paper, thereby breaking the paper into fine pieces. When the knife tip 5 cuts the paper, the sharp point of the knife tip 5 is matched with the convex hull 6 on the other blade, and the convex hull 6 supports the paper, so that the paper can be easily cut. Meanwhile, the cross section of the convex hull is trapezoidal, and the top surface of the convex hull is a plane, so that when the paper is broken, under the action of extrusion force applied to the paper by the two groups of blades, the paper can be bent and deformed at the position of the convex hull, the deformation corresponds to the shape of the cross section of the convex hull to form a trapezoidal shape, and the trapezoidal bending is also formed at the local position of the finally formed shredded paper. The model formed by the shredded paper is easy to be led out of the lower part of the blade, and cannot be wound on the knife tip, so that the breaking rate of the blade is indirectly improved.

Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.

Claims (2)

1. A shredder blade, comprising: blade main part (3), this blade main part (3) center offer with arbor (2) complex arbor hole (4), be provided with knife tip (5) that are used for pricking disconnected paper in the outer fringe of blade main part (3), its characterized in that: the outer edge of the blade main body (3) is provided with a convex hull (6) matched with a tool nose on the other blade, and the cross section of the convex hull (6) is trapezoidal.

2. The shredder blade of claim 1 wherein: the number of the knifepoints (5) on the blade main body (3) is the same as that of the convex hulls (6).