KR102480752B1 - Paper shredder - Google Patents

Abstract

The present invention relates to a document shredder. The document shredder comprises: a main body which forms an external appearance and includes an input port through which documents are introduced; a shredding unit which is installed on an inner side of the main body and connected to the input port to cut a document into preset horizontal and vertical lengths; and a collection container which is provided on a lower portion of the shredding unit and temporarily collects the shredded material. The shredding unit includes: a first rotary shaft and a second rotary shaft arranged parallel to each other; a plurality of a pair of cutters and spacers continuously assembled to the first rotary shaft and the second rotary shaft to intersect with each other; bearings which are installed on the inside of a pair of installation blocks, to which both ends of the first and second rotary shafts are coupled, and rotatably support the rotary shafts, respectively; and a protection member which is dispose between the cutter or spacer installed on the outermost side of each rotary shaft and each installation block and protects the bearings from the impact transmitted through the respective rotary shafts. Accordingly, the protection member is installed between the cutter or spacer installed on the outermost side of each rotary shaft and the bearings so as to cushion impact transmitted through the rotary shafts during a document shredding process. Therefore, it is possible to prevent the bearings from being damaged or broken.

Description

document shredder {PAPER SHREDDER}

The present invention relates to a document shredder, and more particularly, to a document shredder for cutting and shredding documents into pieces.

In general, a document shredder cuts security documents or confidential documents, corporate documents with personal information, receipts from financial institutions, etc. into pieces, and is used in various places such as government agencies, government offices, corporations, and financial institutions.

Such a document shredder allows people to shred documents by simply inserting paper into an input slot, and makes the contents of the shredded documents unrecognizable.

To this end, the document shredder includes a motor and a document shredder cutter, and shreds the input documents while rotating the document shredder cutter by the rotational force of the motor.

In this way, the document shredder shreds the document into small pieces to implement security of blocking information leakage regardless of the type and size of the consumer.

For example, Patent Document 1 and Patent Document 2 below describe document shredder configurations according to the prior art.

In a document shredder according to the prior art, documents introduced through an inlet are supplied to a plurality of pairs of cutters, and the plurality of pairs of cutters are rotated by a rotational force of a motor to shred the introduced documents into small pieces.

In such a document shredder, washers or curlers are installed between a bearing supporting a rotational shaft and spacers installed at both ends of the rotational shaft to prevent impact generated by the cutter during document shredding from being transferred to the bearing.

However, the document shredder according to the prior art has a problem in that the bearings are damaged as the shock generated from the cover during document shredding is transferred to the bearings installed at both ends of the rotating shaft through the spacer and the rotating shaft. Damage to the bearings may cause significant time, human, and economic losses in the maintenance work of the document shredder.

In addition, in the document shredder according to the prior art, documents are sequentially shredded by a plurality of pairs of cutters in the process of being shredded, and the documents are tilted to one side while moving.

For this reason, the document shredder according to the prior art has a problem in that the cutting debris is caught at both ends of the shredding unit and remains at both ends of the shredding unit without falling into the lower collection container.

In particular, the document shredder according to the prior art has problems in that the cutting debris remaining on both ends of the shredding unit accumulates and deteriorates the shredding performance, and in severe cases, the cutter is distorted, damaged or damaged, and the load of the driving motor is increased to cause failure. .

Republic of Korea Patent Publication No. 10-2009-0127653 (published on December 14, 2009) Republic of Korea Patent Registration No. 10-1502747 (Announced on March 16, 2015)

An object of the present invention is to solve the above problems, and to provide a document shredder capable of preventing damage to bearings installed at both ends of a rotating shaft by buffering impact generated by a cutter when shredding documents.

Another object of the present invention is to prevent documents put into a document shredder from leaning to one side while being shredded by a plurality of pairs of cutters, and the shredded cutting debris does not remain on both sides of the shredding unit and can be collected by falling into a lower collection container. It is to provide a document shredder.

Another object of the present invention is to provide a document shredder capable of preventing reduction in shredding efficiency due to document debris remaining between cutters and minimizing noise and vibration generated during shredding.

In order to achieve the above object, the document shredder according to the present invention forms an external shape and is installed inside a main body provided with an inlet through which documents are inserted, and is connected to the inlet to cut documents in a preset horizontal and vertical direction. It includes a shredded section for cutting into length and a collection container provided under the shredded section and temporarily collecting the shredded objects, wherein the shredded section comprises a first rotation shaft and a second rotation shaft disposed parallel to each other, the first rotation shaft and a second rotation shaft. 2 A plurality of pairs of cutters and spacers continuously assembled to cross each other on the rotating shaft, bearings installed inside a pair of installation blocks to which both ends of the first and second rotating shafts are coupled, and rotatably supporting each rotating shaft, and each It is disposed between the cutter or spacer installed at the outermost part of the rotating shaft and each installation block, and includes a protective member for protecting the bearing from impact transmitted through each rotating shaft.

As described above, according to the document shredder according to the present invention, a protective member is installed between the cutter or spacer installed at the outermost part of each rotary shaft and the bearing to cushion the shock transmitted through the rotary shaft during the document shredding process, thereby damaging the bearing. However, the effect of preventing damage is obtained.

And according to the present invention, even if the distance between the outermost cutter or spacer and the bearing is changed due to deformation of the cutter due to long-time use, the effect that the bearing can be safely protected using the protective member is obtained.

In addition, according to the present invention, as the protective members are installed to come into contact with the inner surfaces of the installation blocks disposed on both sides, it is possible to prevent the shredded documents from leaning to one side during the document shredding process. Accordingly, the present invention has an effect of effectively preventing breakage or damage of the driving motor by preventing an increase in the driving load of the driving motor, which occurs as shredded document debris accumulates at both ends of the shredding unit.

In addition, according to the present invention, the effect that oil can be supplied to the rotating shaft, the spacer, and the cutter by applying a protective member made of an oil-containing resin material or a composition formed by molding the material of the oil-containing resin material to both ends of each rotating shaft. is obtained

For this reason, according to the present invention, when shredding documents, the adhesive strength of the shredded document debris on the contact surface between the rotary shaft, the cutter and the spacer can be weakened to allow them to fall smoothly into the collection container provided at the lower part of the shredding unit, and the document debris can be dropped between the cutters. By preventing the residual, it is possible to prevent degradation of shredding performance due to residual document debris and to minimize noise and vibration generated during the shredding operation.

In addition, according to the present invention, the shape and number of protection members are variously changed to protect bearings, simultaneously guide the input direction of documents, and effectively prevent slanting during document shredding.

1 is a perspective view of a document shredder according to a preferred embodiment of the present invention;
Figure 2 is an exploded perspective view of the cut section shown in Figure 1;
3 is an enlarged perspective view in which the cutter, the spacer, and the protective member of the three ends are disassembled;
Figure 4 is an enlarged perspective view of the protection member shown in Figure 3;
5 to 7 are perspective views of a protection member applied to a document shredder according to another embodiment of the present invention, respectively.

Hereinafter, a document shredder according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a document shredder according to a preferred embodiment of the present invention, and FIG. 2 is an exploded perspective view of the shredder shown in FIG. 1 . And FIG. 3 is an enlarged perspective view in which the cutter, the spacer, and the protection member of the three ends are disassembled, and FIG. 4 is an enlarged perspective view of the protection member shown in FIG. 3 .

Hereinafter, a direction toward the cutter 31 centered on the driving motor 33 of the shredded portion 30 is referred to as 'front', and the opposite direction is referred to as 'rear'. In addition, terms indicating directions such as 'left', 'right', 'upper' and 'downward' are defined as indicating respective directions based on the front and rear.

As shown in FIGS. 1 and 2 , the document shredder 10 according to a preferred embodiment of the present invention includes a main body 20 having an external shape and an inlet 21 into which documents are inserted, and a main body 20. A shredder 30 installed inside and connected to the inlet 21 to cut documents into preset horizontal and vertical lengths, and a collection container 40 provided under the shredder 30 to temporarily collect shredded objects. ).

The collection container 40 may be formed in a hexahedral shape with an open upper surface to collect the cutting debris that is cut at the shredded end 30 and falls.

As shown in FIGS. 2 and 3 , the shredded portion 30 is formed on the first rotation shaft 31 and the second rotation shaft 32 , and the first rotation shaft 31 and the second rotation shaft 32 disposed side by side with each other. It includes a plurality of pairs of cutters 50 and spacers 60 that are successively assembled to cross each other.

Each of the first and second rotation shafts 31 and 32 may have a polygonal cross section, for example, a hexagonal shape.

And the shredded part 30 is installed on one end of the driving motor 33 and the first rotational shaft 31 generating driving force and rotating gear 34 that rotates by receiving the driving force generated by the driving motor 33, the first A driving gear 35 installed at the other end of the rotating shaft 31 and a driven gear 36 installed at one end of the second rotating shaft 32 to engage with the driving gear 35 may be included.

That is, the first rotation shaft 31 is a drive shaft that rotates by the driving force generated by the drive motor 33, and the second rotation shaft 32 drives the drive gear 35 and the driven gear 36 from the first rotation shaft 31. It may be a driven shaft that is driven by receiving a driving force through it.

The drive motor 33 and the rotating gear 34 may be connected by a connecting means such as a belt or chain or connected through a gear.

Here, the driving motor 33 may be a DC motor, a brushless motor, or the like, and may be applied as long as the rotational speed of the motor can be controlled, and is not particularly limited.

Meanwhile, torsion portions 311 and 321 may be formed in middle portions of the first and second rotation shafts 31 and 32 excluding portions of both ends, respectively.

Each of the twisting parts 311 and 321 is formed in a shape that rotates at a predetermined angle, for example, about 1° to about 40° with respect to the central axis of each of the rotating shafts 31 and 32, and may be symmetrically arranged to face each other.

So, as the first rotational shaft 31 and the second rotational shaft 32 are formed in the same cross-sectional shape, the configuration of the cutter 50 coupled to the first rotational shaft 31 and the second rotational shaft 32, respectively, is the same, In order to shred documents by engaging with each other, they may be symmetrically arranged facing each other.

The cutter 50 is formed in a substantially disk shape, and a coupling hole 51 coupled to the first rotation shaft 31 or the second rotation shaft 32 may be formed at the center of the cutter 50 .

The cross section of the coupling hole 51 may be formed in a polygonal shape, for example, a hexagonal shape, so as to correspond to the cross section of each of the rotating shafts 31 and 32 .

A key groove 52 having a substantially semicircular cross section may be formed on one side of the coupling hole 51 . The key groove 52 is a part into which a key coupled to each of the rotation shafts 31 and 32 is inserted, ensuring engagement with each rotation shaft 31 and 32, and each rotation shaft during rotation of each rotation shaft 31 and 32. It functions to accurately transmit the rotational force of (31, 32) to the cutter (50).

A plurality of cutting parts 53 formed in a sawtooth shape may be provided on an outer circumferential surface of the cutter 50 to cut documents.

The cutter 50 may be manufactured by mixing metal powders of Fe, Cu, Ni, graphite, and Mn into a substantially plate shape, and then cutting using a press.

Alternatively, the cutter 50 may be manufactured by mixing the above raw materials, filling them in a mold, compressing them by applying pressure, and sintering at a temperature below the melting point of the metal powder.

On the other hand, spacers 60 are installed between adjacent cutters 50 installed on the same rotation shaft to maintain a distance between the cutters 50 .

The plurality of pairs of spacers 60 are each provided with a width substantially corresponding to the width of each cutter 50, and any one, for example, the cutter 50 installed on the first rotation shaft 31 and the relative rotation shaft, that is, the second rotation shaft ( 32) serves to maintain a constant distance between the adjacent cutters 50 and the mating cutter 50 in a state where the cutters (hereinafter referred to as 'opponent cutters') 50 are engaged with each other.

A ring 61 rotating together with the rotation shafts 31 and 32 in a state coupled to the torsion portions 311 and 321 of the rotation shafts 31 and 32 may be installed at the central portion of the spacer 60 .

A ring coupling hole 62 to which the rings 61 installed on the rotation shafts 51 and 52 are coupled may be formed on the inner side of the spacer 60 convexly formed toward the relative spacer 60 .

In addition, the inner surface of the spacer 60 may be formed as a straight surface or a concave curved surface toward the outside in order to avoid interference with the cutter 50 disposed on the other side.

The ring 61 is formed in a substantially circular shape, and a shaft installation hole 63 having a cross-sectional shape of each rotation shaft 31 and 32, that is, a hexagonal shape, may be formed inside the ring 61.

The ring 61 is provided with a thickness thicker than the thickness of the spacer 60 in order to maintain a gap between neighboring cutters 50, and is equal to or slightly less than the thickness of the cutter 50. It may be provided with a thin thickness.

That is, the spacer 60 may be provided with a thickness equal to or smaller than the thickness of the cutter 50 .

At the top and bottom of the outer portion of each spacer 60, a pair of shaft coupling holes 65 coupled with a pair of support shafts 64 supporting the top and bottom of the plurality of pairs of spacers 60 are coupled along the vertical direction. They may be spaced apart from each other.

On the other hand, both ends of the first and second rotational shafts 31 and 32 are rotatably coupled to a pair of installation blocks 37, respectively.

A pair of installation blocks 37 are disposed in a spaced apart state by a distance corresponding to the length of the first and second rotational shafts 31 and 32, and each installation block 37 includes the first and second rotational shafts 31, 32) may be formed with a pair of installation spaces 371 each rotatably installed.

That is, a total of two pairs of bearings 38 are installed at both ends of the first and second rotation shafts 31 and 32 to rotatably support each rotation shaft 31 and 32, and each bearing 38 is installed. It can be installed in the space 371.

In addition, in this embodiment, both ends of each rotation shaft 31 and 32 are disposed in contact with the inner surface of each installation block 37, and the cutter 50 or spacer installed on the outermost side of each rotation shaft 31 and 32 ( 60) and a protective member 70 for protecting the bearing 38 from shock transmitted through each of the rotating shafts 31 and 32 is further installed.

For example, as shown in FIGS. 3 and 4, the protective member 70 is installed between the cutter 50 or spacer 60 and the bearing 38 installed at both ends of each rotation shaft 31 and 32. . That is, the protective member 70 may be provided in total of two pairs so as to be installed at both ends of each of the rotation shafts 31 and 32 .

The protective member 70 may be formed in a substantially ring shape having an outer diameter larger than that of the bearing 38 . A shaft hole 71 having a substantially circular cross section may be formed at the center of the protective member 70 so as to be installed in a fixed state without rotation at both ends of each of the rotating shafts 31 and 32 .

Thus, the protective member 70 can guide documents inputted through the inlet 21 to be inputted through the central portion of the shredding unit 30 and prevent the shredded documents from leaning to one side.

In addition, the protective member 70 is provided with a thickness corresponding to the thickness of the cutter 50 or spacer 60 by spacing between the installation block 37 and the outermost cutter 50 or spacer 60, the shredded It is possible to prevent document scraps from being caught at both ends of the shredded portion 30 .

To this end, the pair of protective members 70 disposed on one side of each of the rotation shafts 31 and 32 may be spaced apart from each other by a preset interval, for example, about 5 mm to 10 mm so that shredded document scraps are not caught. .

In particular, in this embodiment, the protective member 70 may function to provide oil contained therein to each of the rotating shafts 31 and 32, the cutter 50, and the spacer 60. To this end, the protective member 70 may be made of a material made of an oil-containing resin material, or may be provided with a composition obtained by molding the material of the oil-containing resin material.

The oil-containing resin material may release oil constituting the material to the outside by pressure or heat applied to the material.

For example, the oil-containing resin material is obtained by mixing Low Density Polyethylene and Ultra High Molecular Weight Polyethylene at a constant weight ratio, and oil, a crosslinking agent, and an antioxidant are mixed at a constant ratio. It can be made using the composition.

In this way, the present invention can prevent damage or breakage of the bearing by installing a protective member between the cutter or spacer installed at the outermost part of each rotary shaft and the bearing to absorb the impact transmitted through the rotary shaft in the document shredding process.

Next, an operating method of the document shredder according to a preferred embodiment of the present invention will be described in detail.

First, a plurality of documents fed into the document shredder 10 in an overlapping state are fed between a plurality of pairs of cutters 50 provided in the shredder 30 .

At this time, as the plurality of pairs of cutters 50 rotate in opposite directions to each other, a plurality of overlapping documents are fed between the respective cutting units 53 while moving downward.

In this way, the documents fed between each cutting unit 53 are shredded to a width corresponding to the horizontal width of each cutter 50, and the shredded document scraps are again cut between each cutting unit 53 by the next cutting unit 53. It is shredded to a vertical length corresponding to the distance.

At this time, the shredded document scraps may be discharged from each cutter 50 and fall downward to be collected in the collection container 40 .

On the other hand, the protection member 70 installed at both ends of each rotation shaft 31 and 32 is such that the impact generated during the document shredding process is transmitted to the bearing 38 through each rotation shaft 31 and 32, the cutter 50 and the spacer 60. It blocks transmission and protects the bearing (38).

In addition, the protection member 70 prevents the moving document from leaning towards the installation block 37 when the document to be shredded moves to one side, and prevents the shredded document debris from being caught at both ends of the shredding unit 30 can do.

In addition, the protective member 70 discharges the oil contained therein to the outside by heat and pressure generated during the rotation of the cutter 50 and each of the rotating shafts 31 and 32 .

That is, the centrifugal force generated during the rotational operation of the cutter 50 and the first and second rotation shafts 31 and 32, the contact between the cutter 50 and the mating cutter 50, and each cutter 50 and the spacer 60 The oil contained in the protective member 70 is discharged to the outside by the heat generated by the.

In addition, the oil discharged to the outside of the protection member 70 is supplied between the rotating shafts 31 and 32, the cutter 50, and the spacer 60.

In this way, the oil supplied between the respective rotating shafts 31 and 32, the cutter 50, and the spacer 60 is installed with each rotating shaft 31 and 32, the cutter 50, the spacer 60, and the protective member 70. By weakening the adhesive strength of shredded document debris adhering to the contact surface between the blocks 37, they can be smoothly dropped into the collection container 40 provided under the shredded portion 30.

Through the process as described above, the present invention installs a protective member between the cutter or spacer installed at the outermost part of each rotating shaft and the bearing to absorb the impact transmitted through the rotating shaft during the document shredding process to prevent damage or damage to the bearing. It can be prevented.

In addition, even if the distance between the outermost cutter or spacer and the bearing is changed due to deformation of the cutter due to long-term use, the bearing can be safely protected by using the protective member.

In addition, according to the present invention, as the protective members are installed to come into contact with the inner surfaces of the installation blocks disposed on both sides, it is possible to prevent the shredded documents from leaning to one side during the document shredding process. Accordingly, the present invention can effectively prevent breakage or damage to the drive motor by preventing an increase in the drive load of the drive motor, which occurs as the shredded document debris accumulates at both ends of the shredder.

In addition, in the present invention, oil can be supplied to the rotating shaft, the spacer, and the cutter by applying a protective member made of an oil-containing resin material or a composition formed by molding the material of the oil-containing resin material to both ends of each rotating shaft.

Due to this, the present invention weakens the adhesive force of the shredded document debris sticking to the contact surface between the rotating shaft, the cutter and the spacer during document shredding, so that the document debris can fall smoothly into the collection container provided at the bottom of the shredding unit, and the document debris remains between the cutters. By preventing this from happening, it is possible to prevent deterioration in shredding performance due to remaining document debris, and to minimize noise and vibration generated during shredding work.

On the other hand, in the present embodiment, it has been described that a total of two pairs of approximately disc-shaped protection members are installed at both ends of each rotation shaft 31 and 32, but the present invention is not necessarily limited thereto.

For example, FIGS. 5 to 7 are perspective views of a protection member applied to a document shredder according to another embodiment of the present invention.

Figure 5 (a) is a perspective view of a protection member according to another embodiment of the present invention is shown, Figure 5 (b) is a cross-sectional view taken along line A-A' shown in Figure 5 (a) has been

As shown in (a) of FIG. 5, the protective member 70 is provided in total of two pairs, and the outer surface of each protective member 70 is in contact with the installation block 37 on the opposite side, that is, the third section. It may be formed as an inclined inclined surface so as to have a larger outer diameter than the inner surface of the protective member 700 toward the center of the portion 30 .

Therefore, the protective member 70 guides the input direction of the documents to be directed to the center of the shredding unit 30, and prevents the documents to be shredded from leaning toward the installation block. can

Alternatively, as shown in FIG. 6, a total of two pairs of protection members 70 may be provided, and each protection member 70 may be formed in a shape of a polygonal plate such as a rectangular plate or a hexagonal plate.

In this way, the upper surface of each protective member 70 formed in a polygonal plate shape may be formed as an inclined surface 72 inclined toward the central portion of the shredded portion 30 .

In addition, a guide portion 73 may protrude from the inner surface of each protective member 70 toward the central portion of the shredded portion 30 so as to guide the input direction of the input documents.

The guide portion 73 may be manufactured separately from the protection member 70 and attached to the inner surface of the protection member 70, or may be assembled in a coupling manner, or may be integrally molded when the protection member 70 is manufactured.

Therefore, the documents introduced through the inlet 21 are guided toward the center of the shredding unit 30 by the guide unit 73, and are prevented from being moved toward the installation block 37 in the process of being shredded.

Alternatively, as shown in FIG. 7 , the protection member 70 may be provided in a total pair and formed in a polygonal plate shape, such as a hexagonal plate.

A pair of shaft holes 72 are formed in each protective member 70 so that both ends of the first and second rotational shafts 31 and 32 are coupled, and the upper surface of the protective member 70 has a central portion in the forward and backward direction upward. It may be formed as an inclined surface 72 inclined toward the center of the shredded portion 30 in a pointed or convex state.

In addition, a guide portion 73 may protrude from the inner surface of the protective member 70 toward the center of the shredded portion 30 so as to guide the input direction of the input documents.

As such, the present invention can change the shape and number of the protective member in various ways to protect the bearing, guide the input direction of the document, and prevent the document from being tilted during the document shredding process.

Meanwhile, in FIGS. 6 and 7 , the cross section of the guide portion is illustrated in a substantially triangular shape so as to be inclined toward the center of the shredded portion, but the present invention is not necessarily limited thereto, and the guide portion may be convex in a semicircular or oval shape, It may be changed to form a plate or bar shape disposed obliquely toward the center of the cut end.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention.

The present invention is applied to a document shredder technology that prevents damage or breakage of bearings by installing a protective member between a cutter or spacer installed at the outermost part of each rotary shaft and a bearing to absorb the shock transmitted through the rotary shaft during the document shredding process. .

10: document shredder
20: main body 21: inlet
30: sedan
31,32: first and second rotation shafts 311,321: torsion part
33: drive motor 34: rotation gear
35: drive gear 36: driven gear
37: installation block 371: installation space
38: bearing
40: collection container
50: cutter 51: coupling ball
52: keyway 53: cutting part
60: spacer 61: ring
62: ring coupling hole 63: shaft installation hole
64: support shaft 65: shaft coupling ball
70: protection member 71: shaft ball
72: inclined surface 73: guide part

Claims (5)

A main body in which an external shape is formed and an inlet through which documents are inserted is provided;
A shred part installed inside the main body and connected to the inlet to cut the document into preset horizontal and vertical lengths; and
A collection container provided at the bottom of the shredder and temporarily collecting the shredded objects,
The three ends include a first rotation shaft and a second rotation shaft disposed parallel to each other;
A plurality of pairs of cutters and spacers continuously assembled to cross each other on the first and second rotation shafts;
Bearings installed inside a pair of installation blocks to which both ends of the first and second rotation shafts are coupled and rotatably supporting each rotation shaft; and
A protective member disposed between the cutter or spacer installed at the outermost part of each rotation shaft and each installation block and protecting the bearing from impact transmitted through each rotation shaft,
The protective member is formed in a ring shape,
The upper surface of the protection member is formed as an inclined surface inclined toward the center of the shredding part to guide the input direction of the document input through the inlet and prevent the document from being tilted during the document shredding process,
The protective member is provided in total of two pairs so as to be coupled to both ends of the first and second rotation shafts, respectively,
Each pair of protective members disposed on both sides of the three-end portion are spaced apart from each other by a predetermined interval to prevent document debris from being caught,
A document shredder, characterized in that a guide portion for guiding the input direction of documents is formed on an inner surface of each protective member. delete delete A main body in which an external shape is formed and an inlet through which documents are inserted is provided;
A shred part installed inside the main body and connected to the inlet to cut the document into preset horizontal and vertical lengths; and
A collection container provided at the bottom of the shredder and temporarily collecting the shredded objects,
The three ends include a first rotation shaft and a second rotation shaft disposed parallel to each other;
A plurality of pairs of cutters and spacers continuously assembled to cross each other on the first and second rotation shafts;
Bearings installed inside a pair of installation blocks to which both ends of the first and second rotation shafts are coupled and rotatably supporting each rotation shaft; and
A protective member disposed between the cutter or spacer installed at the outermost part of each rotation shaft and each installation block and protecting the bearing from impact transmitted through each rotation shaft,
The protective member is formed in a ring shape,
The upper surface of the protection member is formed as an inclined surface inclined toward the center of the shredding part to guide the input direction of the document input through the inlet and prevent the document from being tilted during the document shredding process,
The protective member is provided as a pair coupled to both ends of the first and second rotation shafts, respectively,
A document shredder, characterized in that a guide portion for guiding the input direction of documents is formed on an inner surface of each protective member. According to claim 1 or 4,
The protective member uses an oil-containing resin material to release oil contained therein to the outside during rotation of the first and second rotational shafts and the cutter and to supply it between the first and second rotational shafts, the cutter, and the spacer. A document shredder characterized in that it is made of a composition formed by molding the material of the oil-containing resin material.

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