The present application claims the benefit of priority to CN Application No. 200810207701.7, filed Dec. 25, 2008, the content is incorporated by reference herein.
The present invention relates to a thin shredder blade, specifically to a new-type thin shredder blade, and more specifically to a new-type thin shredder blade having blade points without steps formed by mechanical punching or die casting, related blade sets formed correspondingly and manufacturing method.
At present, the basic working principle of the cross-cut shredders commonly used is that blades combined with spacing rings are mounted on a shaft, and two parallel shafts driven by a motor cooperated with a gear mechanism rotate reversely to form a shearing force to cut papers passing through into thin strips. Please refer to the common shredder blade shown in
Now the shredder blade used commonly in the common shredders is usually formed integrally by punching a metal sheet having a thickness of more than 1 mm with a die, then a single blade set is 1×2 mm in thickness, which results in the width of the shredded paper obtained is 1×2 mm correspondingly. Because in the shredding process, firstly the blade points of two opposite blade sets penetrate the paper to make holes, then the paper is cut and fragmented into chips (as shown in
Now there have a thin shredder blade which is made by punching at the cutting part of a thin metal sheet to form a protrusion 6, which reduces the material cost greatly, while the cutting part (including the blade point 5) has a relatively high strength, but due to the processing method, there is a step between the blade point 5 and the protrusion 6 (as shown in
In order to solve the existing problems and shortcomings mentioned above, it is necessary to improve the common thin shredder blades.
Aspects of the present invention generally pertains to a new-type thin shredder blade having blade points without steps, related blade sets and manufacturing method, with the blade sets formed by the new-type thin shredder blade having blade points without steps. In one aspect, the shredder can reduce the production cost and the energy consumption greatly, while meet the same cutting requirement of the common shredder entirely.
In a first aspect of the present invention, a new-type thin shredder blade having blade points without steps is provided, and comprises at least one blade body and at least one cutting part, the cutting part is located on the periphery of the blade body and includes a blade point,, In an aspect, the cutting part at least further comprises a protrusion which protrudes from the cutting part and includes a top, a inclined plane extends between the top and the blade point, and an acute angle is formed by the inclined plane and the blade body.
In a further aspect, the inclined plane is an inverted triangle.
In yet another aspect, the cutting part further includes a first hemline and a second hemline extending respectively from the blade body and intersecting to the blade point, a first plane extends between the top and the first hemline and intersects with the inclined plane.
In a further aspect, the cutting part is formed integrally.
In a further aspect, two or more said cutting parts are arranged symmetrically.
In a further aspect, the blade body includes at least one large protrusion which protrudes in the same direction as the protrusion.
In yet another aspect, the large protrusion is an annular large protrusion.
In yet another aspect, the large protrusion is communicated with the protrusion.
In yet another aspect, the large protrusion is not higher than the protrusion.
In further aspect, the overall shape of the new-type thin shredder blade can be circular, oval or regular polygonal. Of course, it may also be other suitable shapes.
In a further aspect, the new-type thin shredder blade having blade points without steps has a polygonal hole at its center. The hole also can be other shapes, which depends on the shaft inserted.
In a second aspect of the present invention, a blade set formed by the new-type thin shredder blades having blade points without steps is provided, and its characteristics are: it comprises two same above-mentioned new-type thin shredder blades having blade points without steps.
In a further aspect, one said new-type thin shredder blade having blade points without steps combines with the other said new-type thin shredder blade having blade points without steps in a back-to-back manner.
In a further aspect, one said new-type thin shredder blade having blade points without steps combines with the other said new-type thin shredder blade having blade points without steps in a face-to-face manner.
In another aspect, it further comprises a spacing ring between the two new-type thin shredder blades having blade points without steps.
In a third aspect of the present invention, a multi-step mechanical punching method is provided, and its characteristics are: it is used to manufacture the above mentioned new-type thin shredder blades having blade points without steps, and comprises the following steps:
In one other aspect, in step b, a means of increasing the punching force is used to stack material thicker than the whole archetypal protrusion on the side surface of the archetypal cutting part.
In one aspect, in step b, a means of finishing is used to stack material thicker than the whole archetypal protrusion on the side surface of the archetypal cutting part.
In one aspect, in step b, a means of extruding or bending material is used to stack material thicker than the whole archetypal protrusion on the side surface of the archetypal cutting part.
In one aspect, in step a, it further comprises a step of punching the archetypal blade body of the archetypal blade, so that the archetypal blade body protrudes to form at least one large protrusion which protrudes in the same direction as the archetypal protrusion.
In yet another aspect, the large protrusion is an annular large protrusion.
In yet another aspect, the large protrusion is communicated with the archetypal protrusion.
In yet another aspect, the large protrusion is not higher than the archetypal protrusion.
In one aspect, in step b, it further comprises a step of stack material thicker than the whole archetypal protrusion on the front surface of the archetypal cutting part;
In yet another aspect, in step c, it further comprises a step of cutting and punching the material stacked on the front surface to produce a first plane which extends between the top and the first hemline of the cutting part.
In yet another aspect, a means of increasing the punching force is used to stack material the thickness of which is thicker than the whole archetypal protrusion on the side surface of the archetypal cutting part.
In yet another aspect, a means of finishing is used to stack material thicker than the whole archetypal protrusion on the side surface of the archetypal cutting part.
In yet another aspect, a means of extruding or bending material is used to stack material thicker than the whole archetypal protrusion on the side surface of the archetypal cutting part.
The beneficial effects of the present invention are as follows:
a is a side view of the blade set formed by combining two thin shredder blades having blade points with a step shown in
b is a partial enlarged schematic view of the area I of
a is a vertical cutaway view of the example shown in
b is a partial enlarged schematic view of the area III of
c is a transverse cutaway view of the example shown in
a is a side view of the blade set formed by combining two examples shown in
b is a partial enlarged schematic view of the area IV of
In order to understand the technical content of the present invention more clearly, please refer to
In order to overcome the shortcomings of the common shredder blades, a new-type thin shredder blade has been created after a long-term research and testing, which can substitute for the existing shredder blades completely, and achieve the same shredding requirement. Please refer to
The new-type thin shredder blade 10 is a disk-shaped blade made from a metal sheet more than 0.3 mm by mechanical punching or die casting. The circumference of the disc-shaped blade protrudes outwardly to form a cutting part 11, or, if desired, cutting parts spaced a desired angle, that is, two or more cutting parts 11 are arranged symmetrically. Please refer to
The cutting part 11 further includes a first hemline 115 and a second hemline 116 extending respectively from the blade body 12 and intersecting to the blade point 111; a first plane 117 extends between the top 113 and the first hemline 115 and intersects with the inclined plane 114.
Therefore, the inclined plane 114 and the first plane 117 combined with the protrusion 112 form the unique cutting part 11, the shape of which is similar to the general cutting edge of the common shredder blade and used to penetrate and cut the paper to be shredded.
Thus, the processing of the unique cutting part 11 is also different from that of the cutting part punched directly, and particularly adopts an innovative multi-step mechanical punching method to manufacture the unique cutting part 11 of the present invention, which has a shape similar to the common cutting edge, as well as the protrusion 112.
The above-mentioned multi-step mechanical punching method comprises the following steps: first, punch a thin metal sheet having an archetypal blade, so that the archetypal cutting part of the archetypal blade protrudes from the middle to form an archetypal protrusion 202, thus the thickened archetypal cutting part is obtained, at this time, there is a step existed between the archetypal blade point 203 and the archetypal protrusion 202, as shown in
When the inclined plane 114 and the first plane 117 are being cut and punched, the two directions of cutting and punching can be the directions of the arrows 206 and 207 shown in
The means of increasing the punching force or finishing can be used to stack material, for example, the means of finishing is used to stack material on the archetypal blade point 203, so as to produce an integrated cutting part 11. Of course, it can extrude or bend material from other surface(s) to achieve the aim of stacking material as shown in
The height of the protrusion 112 can be optional, i.e. the protrusion 112 causes the original thin blade more than 0.3 mm to achieve the required thickness of the entire form, as shown in
The new-type thin shredder blade 10 has at its center a central hole 13 through which the shredder shaft can pass. The central hole 13 is usually a polygonal hole into which a shaft can insert. It also can be other shapes, which depends on the shaft inserted. An annular large protrusion 121 protrudes from the blade body 12 of the new-type thin shredder blade 10 in the same direction as the protrusion 112, and is not higher than the protrusion 112 and communicated with the protrusion 112; of course, it can be not communicated with the protrusion 112. The shape of the large protrusion 121 is optional, but has symmetry, so as to balance the blade. The large protrusion 121 and the protrusion 112 both have the role of strengthening the anti-bending strength of the new-type thin shredder blade 10. And the processing of the large protrusion 121 can be done through punching the archetypal blade body during punching the archetypal cutting part, which is preferable, or after the processing of the cutting part 11 is completed. The shape of the new-type thin shredder blade 10 can also be oval, regular polygonal or other suitable shapes.
When a blade set 14 is formed by combining two new-type thin shredder blades C1 and C2 mounted on the shaft A in the back-to-back manner, that is, protrusion against protrusion, as shown in
Thus, when the two shaft groups A and B are driven by the motor to rotate reversely, as the directions of the arrows in
In fact, the function achieved by the blade set 14 and the blade set 17 just equals to that achieved by the previous blade sets H and H′ (as shown in
While the present invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the claims. It is clearly understood therefore that the same is by way of illustration and example only and is not to be taken by way of limitation.
Number | Date | Country | Kind |
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200810207701.7 | Dec 2008 | CN | national |