JP6507494B2 - Card shredding device - Google Patents

Description

  The present invention relates to a card shredding device for shredding cards.

  2. Description of the Related Art Conventionally, when discarding cards such as magnetic cards and IC cards, shredding of cards by a card shredding device has been performed in order to suppress outflow and unauthorized use of information possessed by these cards. For example, the card shredding device described in Patent Document 1 shreds a card into a plurality of pieces having a strip shape.

Patent Document 1: Japanese Patent Application Publication No. 2001-300334

  However, only by shredding the card into a plurality of fragments, all of the information to be illegally used may be included in one fragment, or the information may be restored by joining a plurality of fragments. Therefore, there is a possibility that the information possessed by the card may be used illegally. Therefore, there is a need for a card shredding device for shredding cards in a situation where unauthorized use of such information is difficult.

  An object of the present invention is to provide a card shredding device capable of suppressing unauthorized use of information possessed by the card by shredding the card.

  A card shredding device for solving the above problems is a card shredding device including a shredding unit for shredding a card having information, wherein the shredding unit includes a plurality of first cutters and a plurality of second cutters. A cutter is provided, and the first cutter is a cutter having a disk shape centered on a first rotation axis, and has an outer peripheral surface rotating around the first rotation axis as a main blade. The second cutter is a cutter having a disk shape centered on a second rotation axis parallel to the first rotation axis, and is opposite to the rotation direction of the first cutter around the second rotation axis. The outer peripheral surface which rotates in the direction of 1 is provided as a main blade. When viewed in the axial direction of the first rotation shaft, a portion of the outer peripheral portion of the first cutter and a portion of the outer peripheral portion of the second cutter have mutually overlapping regions, and in the mutually overlapping regions The main blade of the first cutter and the main blade of the second cutter are alternately arranged along the axial direction of the first rotation shaft, and a plurality of the first cutters and a plurality of the second cutters are alternately disposed. It is configured to apply a shear force to the card entering between the cutters. And, at least one of the plurality of cutters is provided with a secondary blade that protrudes from the outer peripheral surface of the cutter.

  According to the above configuration, the outer peripheral portion of the first cutter and the outer peripheral portion of the second cutter have a region overlapping each other when viewed in the axial direction, and the card entering this region is the main blade of the first cutter and the first cutter (2) It is divided into pieces along the rotation direction of the cutter under the shearing force of the main blade of the cutter. At this time, since the sub blade protrudes from the outer peripheral surface of at least one cutter, the sub blade exerts a force on the card to press the card along the thickness direction of the card. Then, since such intermittent force acts on the card in the process of shredding, a part of the fragment deforms so that the fragment is crushed along the thickness direction of the card. As a result, it is difficult to restore the card to a state close to the card before being shredded, and even within one fragment, it is difficult to read the information possessed by the card due to deformation, so Unauthorized use is suppressed.

  In the card shredding device, the shredding portion is disposed between the second cutters arranged along the axial direction of the second rotation shaft, and further includes a guide portion facing the main blade of the first cutter. It is preferable that the guide portion extends along the rotational direction of the first cutter from a position opposite to a portion constituting the mutually overlapping region in the main blade.

  According to the above configuration, the card passing between the main blade of the first cutter and the guide portion is deformed into a curved shape by being pressed against the guide portion by the main blade. Therefore, since card restoration becomes more difficult, unauthorized use of information possessed by the card can be further suppressed.

  The card shredding device is a storage portion different from the first storage portion for storing the pieces of the card discharged by the rotation of the first cutter, and the first storage portion, wherein the rotation of the second cutter is performed. It is preferable to further comprise a second storage unit for storing the pieces of the card discharged by the device.

  According to the above-mentioned configuration, one of the two fragments constituting the portion adjacent to each other before the card is shredded is accommodated in the first accommodating portion by the rotation of the first cutter, and the other of the two fragments is , And is accommodated in the second accommodation portion by rotation of the second cutter. Therefore, it is difficult to find out the two fragments that constitute adjacent parts as one set of fragments, and it is more difficult to connect the fragments and restore the card. Therefore, unauthorized use of the information possessed by the card can be further suppressed.

  In the card shredding device, each of the first cutter and the second cutter adjacent to each other in the mutually overlapping region has the sub-blade, and the sub-blades of the first cutter overlap each other When located in the area, it is preferable that the sub-blades of the second cutter be located other than the overlapping area.

  According to the above configuration, the first cutter and the second cutter apply the pressing force by the sub blade to the card at mutually different timings. Therefore, compared with the case where the first cutter and the second cutter press the card at the same timing, the load required for shredding is dispersed, and the load applied to the shredding portion is reduced.

In the card shredding device, it is preferable that a gap be formed between the first cutter and the second cutter in the mutually overlapping region.
According to the above configuration, the card is easily cut between the first cutter and the second cutter.

  According to the present invention, by shredding a card, it is possible to suppress unauthorized use of information possessed by the card.

It is a figure which shows the whole structure of the card | curd shredding apparatus of one Embodiment. It is a perspective view which shows the perspective view structure of the shredding part in the card shredding apparatus of one Embodiment. It is a front view showing front structure of a cutter and a guide part in a card shredding device of one embodiment. It is a top view which shows the upper surface structure of the shredding part in the card shredding apparatus of one Embodiment. It is a figure which illustrates typically an apparatus state when a card | curd is shredded in the card shredding apparatus of one Embodiment with a card | curd. It is a partial top view which shows the partial structure of the shredding part in the card shredding apparatus of one Embodiment. FIG. 2 illustrates a card shredded by a card shredding device of an embodiment. It is an operation view showing operation of a card shredding device of one embodiment, and is a figure showing a process in which a piece of a card pressed by the 1st cutter is collected. It is an operation view showing operation of a card shredding device of one embodiment, and is a figure showing a process in which a piece of a card pressed by the 2nd cutter is collected. It is a figure which shows the perspective structure of the cutter in the card | curd shredding apparatus of a modification, and its assembly process. It is a figure which shows the perspective structure of the cutter in the card | curd shredding apparatus of a modification, and its assembly process. It is a front view which shows the front structure of the cutter in the card | curd shredding apparatus of a modification. It is a front view which shows the front structure of the cutter in the card | curd shredding apparatus of a modification.

One embodiment of the card shredding device will be described with reference to FIGS. 1 to 9.
[Overall Configuration of Card Shredding Device]
As shown in FIG. 1, the card shredding device 10 includes a shredding unit 20 for shredding a card, a drive unit 30 for driving the shredding unit 20, and a piece of the card shredded by the shredding unit 20. And an accommodating portion 40 for accommodating the

  The shredding unit 20, the drive unit 30, and the housing unit 40 are housed inside a housing 11 of the card shredding device 10. Among the parts of the housing 11, a supply port 11 a communicating the inside and the outside of the housing 11 is formed in a part located above the position where the card is shredded by the shredding unit 20. There is. The card to be shredded is supplied from the supply port 11 a to the shredding unit 20.

  The shredding unit 20 has a plurality of cutters 21 and a plurality of guide portions 22. The cutter 21 applies a shear force to cut the card into strips and a pressing force in the thickness direction of the card to the card by the rotation of the cutter 21, and the guide portion 22 presses the card by the cutter 21. Assist in granting.

The drive unit 30 has a motor as a power source for rotating the cutter 21 of the shredding unit 20, a mechanism for transmitting power from the power source to the cutter 21, and the like.
The housing portion 40 has a first housing portion 40A and a second housing portion 40B. The space in which the fragments of the card are accommodated in the first accommodation portion 40A and the space in which the fragments of the card are accommodated in the second accommodation portion 40B are separated. The first accommodating portion 40A and the second accommodating portion 40B separate the fragments of the card accommodated in the first accommodating portion 40A and the fragments of the card accommodated in the second accommodating portion 40B to the outside of the housing 11 separately. In the housing 11 so that it can be taken out.

  The card to be shredded by the card shredding device 10 is a card having information, and a resin card such as a magnetic card or an IC card, a resin card having no magnetic stripe or an IC chip, etc. It is a card that is thicker and harder than ordinary paper.

  The arrangement of each part in the card shredding device 10 is not limited to the arrangement shown in FIG. 1. For example, in the card shredding device 10, a card to be shredded from the side surface portion of the housing 11 is It may have a supplied configuration.

[Composition of shredder]
The detailed configuration of the shredding unit 20 will be described with reference to FIGS. 2 to 4.
First, the entire configuration of the shredding unit 20 will be described with reference to FIG. In addition, in FIG. 2, in order to make the positional relationship of the some cutter 21 intelligible, the most front guide part 22 is shown with the dashed-two dotted line.

  As shown in FIG. 2, the plurality of cutters 21 has a plurality of first cutters 21 </ b> A having a disk shape that rotates about the first rotation shaft 23 as the first rotation shaft 23 rotates, and a second rotation It is divided into a plurality of second cutters 21 </ b> B having a disk shape that rotates around the second rotation shaft 24 as the shaft 24 rotates. The first rotation shaft 23 and the second rotation shaft 24 are arranged in parallel with each other, the first rotation shaft 23 passes the center of each first cutter 21A, and the second rotation shaft 24 is each second cutter 21B. Through the center of Each of the first rotation shaft 23 and the second rotation shaft 24 has a regular hexagonal cross-sectional shape as viewed from the axial direction.

  Each of the first rotating shaft 23 and the second rotating shaft 24 is connected to the drive unit 30 and receives power from the drive unit 30 to rotate. For example, the first rotation shaft 23 receiving the driving force from the drive unit 30 rotates clockwise, while the second rotation shaft 24 receiving the driving force from the drive unit 30 rotates the first rotation shaft 23 For example, it rotates around the left, which is the direction opposite to the direction. At this time, when viewed from the direction in which the card is supplied, that is, when looking at the shredder 20 from the supply port 11a, the first rotation shaft 23 rotates in the direction toward the second rotation shaft 24, and the second rotation shaft 24 rotates in a direction toward the first rotation axis 23.

  The plurality of guide portions 22 are divided into a first guide portion 22A opposed to the first cutter 21A and a second guide portion 22B opposed to the second cutter 21B. The first guide portion 22A is disposed on the second rotary shaft 24 side with respect to the first cutter 21A, and the second guide portion 22B is disposed on the first rotary shaft 23 side with respect to the second cutter 21B. The second guide portion 22B is located between the first cutters 21A aligned along the axial direction of the first rotation shaft 23, and between the second cutters 21B aligned along the axial direction of the second rotation shaft 24. The first guide portion 22A is located.

  The detailed configuration of the cutter 21 and the guide portion 22 will be described with reference to FIG. Although FIG. 3 illustrates the first cutter 21A and the first guide portion 22A, the second cutter 21B and the second guide portion 22B have the same configuration.

  As shown in FIG. 3, the cutter 21 protrudes from the outer peripheral surface of the disk portion 21 a toward the radial direction outer side from the outer peripheral surface of the disk portion 21 a which is formed in a disk shape and has an outer peripheral surface as a main blade. And a projection 21b as a secondary blade. When viewed from the axial direction of the disk portion 21a, the protrusion 21b has a substantially rectangular shape, and one side thereof is connected to the disk portion 21a. The protrusion 21 b is formed in a ridge shape extending over the entire axial direction of the disk portion 21 a on the outer peripheral surface of the disk portion 21 a. That is, the protrusion 21 b has a quadrangular prism shape, and one surface of the protrusion 21 b is connected to the disk portion 21 a.

  Although the number and position of the protrusions 21b are not limited, in the case where there are a plurality of protrusions 21b, it is preferable that the protrusions 21b be equally disposed along the circumferential direction of the disk 21a. The disk portion 21a and the protrusion 21b are integrally formed of, for example, metal.

  The guide portion 22 faces a part of the outer peripheral surface of the disk portion 21a, and the entire outer peripheral surface of the disk portion 21a is opposed by rotation of the disk portion 21a. That is, the guide portion 22 faces the main blade in the disk portion 21a, and also faces the protrusion 21b which is a secondary blade.

  The card is inserted into the shredding unit 20 from the outside in the radial direction of the disk unit 21a, with the surface direction of the card along the axial direction of the disk unit 21a. The range in which the guide portion 22 and the outer peripheral surface of the disk portion 21a face each other is not particularly limited. The guide portion 22 is an outer peripheral surface of the disk portion 21a only in a region where the rotation direction of the cutter 21 substantially matches the traveling direction of the card. And the outer peripheral surface of the disk portion 21a may be opposed to the above region.

  In such a configuration, the card passes between the cutter 21 and the guide 22 and passes through the shredding unit 20. The guide portion 22 is disposed along the card transport path and guides the card transport direction.

The arrangement of the plurality of cutters 21 and the plurality of guide portions 22 will be described with reference to FIG. 4.
As shown in FIG. 4, the distance between the first rotation axis 23 and the second rotation axis 24 is shorter than the total length of the radius of the first cutter 21A and the radius of the second cutter 21B. A portion of the outer peripheral portion of the first cutter 21A and a portion of the outer peripheral portion of the second cutter 21B overlap with each other when viewed from the axial direction of the rotary shafts 23 and 24. In a region where a portion of the first cutter 21A and a portion of the second cutter 21B overlap with each other, the disc portion 21a of the first cutter 21A and the disc portion 21a of the second cutter 21B have rotational shafts 23, 24. They are alternately arranged along the axial direction. When viewed in the axial direction of the rotation shafts 23 and 24, a part of the rotation track of the outer peripheral edge of the first cutter 21A and a part of the rotation track of the outer peripheral edge of the second cutter 21B mutually overlap.

  The first guide portion 22A extends along the rotational direction of the first cutter 21A from the position facing the portion overlapping with the second cutter 21B when viewed from the axial direction in the outer peripheral surface of the disk portion 21a of the first cutter 21A. . The second guide portion 22B extends along the rotational direction of the second cutter 21B from the position facing the portion overlapping the first cutter 21A when viewed from the axial direction in the outer peripheral surface of the disk portion 21a of the second cutter 21B. .

  In such a configuration, the card is inserted in a region where a part of the first cutter 21A and a part of the second cutter 21B overlap each other, with the surface direction of the card being along the axial direction of the rotary shafts 23 and 24.

The number of first cutters 21A and the number of second cutters 21B are not particularly limited, and may be determined according to the need for the number of card divisions by shredding.
[Effect]
With reference to FIGS. 5-9, the effect | action which the card | curd shredding apparatus 10 of this embodiment brings about is demonstrated. In FIG. 5, in order to make it easy to understand how the card is shredded, the deformation of the card and the size of the gap between the first cutter 21A and the second cutter 21B are emphasized.

  As shown in FIG. 5, the card 50 supplied to the shredding unit 20 is involved in the rotation of the first cutter 21A and the rotation of the second cutter 21B. The card 50 receives a force F1 directed outward in the radial direction of the disc portion 21a from the disc portion 21a of the first cutter 21A, and a force directed outward in the radial direction of the disc portion 21a from the disc portion 21a of the second cutter 21B. Receive F2. As a result, in the region between the adjacent first cutter 21A and second cutter 21B, these forces F1 and F2 act on the card 50 as a shear force.

  Further, the card 50 receives a force F3 directed outward in the radial direction of the disk portion 21a from the protrusion 21b. The force F3 acts as a pressing force on the card 50 in the thickness direction of the card 50. The force F3 is generated only at the portion where the card 50 and the protrusion 21b face each other, so the force F3 acts locally in the surface direction of the card 50. Further, in the portion of the card 50 facing the protruding portion 21b of the second cutter 21B, the portion closer to the first cutter 21A receives the force in the direction opposite to the force F3 due to the force F1. Strong pressure is received. Similarly, in the portion of the card 50 facing the protrusion 21b of the first cutter 21A, the portion closer to the second cutter 21B receives a stronger pressing force.

  As a result, the card 50 is cut between the first cutter 21A and the second cutter 21B, and in the portion of the card 50 facing the protrusion 21b, deformation occurs in the thickness direction of the card 50.

  Here, in the portion where the card 50 and the protrusion 21 b face each other, the card 50 is supported by the guide 22 from the side opposite to the protrusion 21 b. As a result, since the card 50 receives a force in the direction opposite to the force F3 from the guide portion 22, the pressing force by the force F3 acts strongly, and compared with the case where the guide portion 22 is not provided, The deformation in the thickness direction becomes large.

  As shown in FIG. 6, it is preferable that a gap be formed between the first cutter 21A and the second cutter 21B adjacent to each other. When the gap is formed, the card 50 is easily cut between the first cutter 21A and the second cutter 21B. The size of the gap, that is, the distance d1 between the first cutter 21A and the second cutter 21B is determined so that the shredding proceeds smoothly according to the material, thickness, etc. of the card to be shredded, for example, If the card 50 is formed mainly of polyvinyl chloride or polypropylene, the distance d1 is preferably 0.1 mm or less.

  In a portion where the cutter 21 and the guide portion 22 face each other, when the protrusion 21 b and the guide portion 22 face each other, the distance d 2 between the protrusion 21 b and the guide portion 22 is the thickness of the card to be shredded It is preferable that the size is as follows. For example, when the card to be shredded is a 0.76 mm thick card conforming to the ISO standard, such as a general magnetic card or an IC card, the distance d2 is preferably 0.76 mm or less.

  According to such a configuration, at the portion where the cutter 21 and the guide portion 22 face each other, the function of the guide portion 22 to support the card 50 is enhanced against the force F3 from the protrusion 21 b, and the card 50 is received from the guide portion 22. Since the force is increased, the deformation in the thickness direction of the card 50 is increased.

  The length d3 of the protrusion 21b in the radial direction of the disk portion 21a is not particularly limited, but the pressing force applied by the protrusion 21b to the card 50 works stronger as the length d3 of the protrusion 21b is longer. Therefore, it is preferable that the length d3 of the protrusion be determined according to the degree of deformation in the thickness direction desired to be given to the card 50.

  In addition, the length d4 of the disc portion 21a in the axial direction of the disc portion 21a defines the width of the fragment of the shredded strip-like card 50, so the width of the fragment of the card 50 is desired according to the desired length. It is preferable to be determined.

  Further, in a state before the first cutter 21A and the second cutter 21B start to rotate, it is preferable that the position of the projection 21b of the first cutter 21A is different from the position of the projection 21b of the second cutter 21B. . The rotational phase of the projection 21b of the first cutter 21A is the same as that of the projection 21b of the second cutter 21B, based on the region where the first cutter 21A and the second cutter 21B overlap with each other when viewed from the axial direction. It is preferable that the drive unit 30 rotate each cutter 21 so as to be different from the rotational phase. In this case, when the first cutter 21A and the second cutter 21B are rotating, the projection 21b of the first cutter 21A and a part of the first cutter 21A are viewed from the axial direction of the rotary shafts 23, 24. When it is located in the area | region which mutually overlaps with a part of 2nd cutter 21B, the projection part 21b of the 2nd cutter 21B is located except the area | region which mutually overlaps.

  According to such a configuration, when the first cutter 21A and the second cutter 21B are rotating, the protrusion 21b of the first cutter 21A and the protrusion 21b of the second cutter 21B press the card 50 substantially simultaneously. The first cutter 21A and the second cutter 21B apply pressure to the card 50 by the protrusions 21b at different timings. Therefore, compared with the case where the first cutter 21A and the second cutter 21B press the card 50 at the same timing, the stress applied to the shredder 20 is dispersed. As a result, the load on the shredding unit 20 is reduced.

As shown in FIG. 7, as a result of shredding by the shredding unit 20, the card 50 is divided into strip-like pieces 50a in a number corresponding to the number of the first cutter 21A and the second cutter 21B.
In the part 50a, a deformation occurs in the thickness direction of the card 50 at the portion pressed by the protrusion 21b. The deformation points 51 are arranged along the extending direction of the shear position in the piece 50a. Specifically, such deformation is, for example, a flaw or a dent formed on the surface of the fragment 50a, and the fragment 50a may be shredded at the deformation portion 51 if the pressing force is large. Further, as described above, since the pressing force by the protrusion 21b works stronger toward the portion closer to the first cutter 21A and the second cutter 21B, the portion closer to the shear position at each of the deformation points 51, ie, The closer to the end of the fragment 50a, the larger the deformation.

  In one piece 50a, the distance between the deformation points 51 corresponds to the distance between the protrusions 21b in the circumferential direction of the disk portion 21a. Further, as described above, the width of the fragment 50a is determined by the length d4 of the disk portion 21a, and the degree of deformation at the deformation portion 51 is determined by the distance d2 between the projection 21b and the guide 22 and the projection 21b. It depends on the length d3.

  As described above, according to the card shredding device 10 of the present embodiment, the card 50 is divided into the strip-like pieces 50a, and the pieces 50a are partially deformed in the thickness direction of the card 50. It occurs. If deformation in the thickness direction occurs, it is difficult to restore the card to a state close to the card before being shredded, even if the pieces 50a are joined together. Further, since the deformation in the thickness direction partially destroys the information written on the surface of the card 50, reading of such information also becomes difficult.

  When the card 50 is a magnetic card or an IC card, the magnetic stripe or IC chip holding the information is destroyed by the cutting of the card 50 or the deformation of the card 50 in the thickness direction. It will also be difficult.

Therefore, by the card shredding device 10 of the present embodiment shredding the card 50, it is possible to suppress unauthorized use of the information possessed by the card 50.
Here, as in the conventional case, when the card is only divided into strips by shredding of the card and no deformation in the thickness direction occurs, the magnetic stripe or the IC chip is contained in one piece. And, the magnetic stripe and the IC chip are not destroyed. As a result, there is a possibility that information possessed by the magnetic stripe or the IC chip may be extracted and used illegally. In order to break the magnetic stripe or IC chip, it is necessary to increase the number of cutters to make the width of the fragments smaller, or to process the fragments further. However, increasing the number of cutters results in a significant complication of the shredding portion of the card shredding device, and adding further processing to the fragments results in an increase in processing time.

  On the other hand, in the card shredding device 10 of the present embodiment, deformation in the thickness direction occurs in the strip-like pieces 50a, and therefore, when the card 50 is a magnetic card, the piece 50a of one magnetic stripe is Even if it is contained inside, the magnetic stripe is damaged at the deformation point 51. For example, even if the position of the magnetic stripe changes depending on the direction in which the card 50 is inserted into the shredding unit 20, the magnetic stripe is damaged regardless of the position of the magnetic stripe.

  When the card 50 is an IC card, even if the IC chip is contained in one piece 50a, the IC chip is damaged at the deformed portion 51. The position of the deformed portion 51 can be adjusted by the distance between the protrusions 21b in the circumferential direction of the disk portion 21a, so that the adjustment for breaking the IC chip can be simplified as compared with increasing the number of cutters 21. Can be realized. For example, even if the position of the IC chip changes depending on the direction in which the card 50 is inserted into the shredding unit 20, it is also easy to set the deformation points 51 to be located at all the positions where the IC chip can be arranged. It is.

  Therefore, according to the card shredding device 10 of the present embodiment, the certainty about destruction of the information contained in the magnetic stripe and the IC chip is enhanced while suppressing the significant complication of the shredding unit 20 and the increase in the processing time. Can. As a result, unauthorized use of such information can be suppressed.

  In addition, since the protrusion 21b rotates with the disk portion 21a while pressing the card 50, the cutter 21 has a protrusion 21b, so that the force with which the cutter 21 takes in the card 50 becomes strong. Therefore, when the card 50 is supplied to the shredding unit 20, the external force required to insert the card 50 into the shredding unit 20 is reduced.

  As shown in FIG. 8, among the shredded fragments 50a, the fragments 50a facing the outer peripheral surface of the disk portion 21a of the first cutter 21A are pushed out by the rotation of the first cutter 21A, and the first cutter is cut away. It is discharged through between 21A and the first guide portion 22A. The fragments 50a opposed to the outer peripheral surface of the disk portion 21a of the first cutter 21A are discharged to the opposite side of the second rotary shaft 24 with respect to the first cutter 21A, and are accommodated in the first accommodation portion 40A.

  As shown in FIG. 9, among the shredded fragments 50a, the fragments 50a facing the outer peripheral surface of the disc portion 21a of the second cutter 21B are pushed out by the rotation of the second cutter 21B, and the second cutter The air is discharged between the space 21B and the second guide 22B. That is, the fragments 50a opposed to the outer peripheral surface of the disk portion 21a of the second cutter 21B are discharged to the opposite side to the first rotary shaft 23 with respect to the second cutter 21B, and stored in the second storage portion 40B. Ru.

  Therefore, before the card 50 is shredded, the pieces 50a constituting the parts adjacent to each other are discharged in different directions, and stored in the different accommodating parts 40A and 40B. Then, the fragment 50a accommodated in the first accommodation portion 40A and the fragment 50a accommodated in the second accommodation portion 40B are separately taken out of the card shredding device 10 and discarded.

As described above, since the fragments 50a constituting the portions adjacent to each other in the card 50 are collected separately, it is more difficult to connect the fragments 50a and restore the card 50.
In addition, when the fragments 50a pass between the first cutter 21A and the first guide portion 22A or between the second cutter 21B and the second guide portion 22B, the curved surface of the guide portion 22 by the disc portion 21a. That is, it continues to be pressed against the curved surface which bends along the outer peripheral surface of the disk portion 21a. As a result, the fragments 50a are deformed along the outer shape of the disk portion 21a to form a curved shape.

  In the above configuration, when the piece 50a discharged from the first cutter 21A is curved with one of the two sides of the card facing inward, the piece 50a discharged from the second cutter 21B is the one side described above It curves with the surface on the opposite side to the surface of. Therefore, since the pieces 50a constituting the portions adjacent to each other in the card 50 are curved in different directions, it is more difficult to connect the pieces 50a and restore the card 50.

As described above, according to the card shredding device 10 of the present embodiment, the effects listed below can be obtained.
(1) A projecting portion which is a secondary blade 21a having an outer peripheral surface as a main blade having a function of shearing the card 50 and a secondary blade having a function of causing deformation of the card 50 in the thickness direction 21b, it has two types of blades with different functions. According to such a configuration, the card 50 is divided into strip-like pieces 50a, and the pieces 50a are partially deformed so as to be crushed in the thickness direction of the card 50. As a result, even if pieces 50a are joined together, it is difficult to restore the card 50 to a state close to the card before being shredded, and the information written on the surface of the card 50 or the magnetic stripe or IC chip It also makes it difficult to read and read information. Therefore, by shredding the card 50, it is possible to suppress unauthorized use of the information possessed by the card 50.

  (2) Since the pieces 50a constituting the portions adjacent to each other in the card 50 are curved in different directions by the provision of the guide portion 22, the pieces 50a are joined to restore the card 50. Becomes more difficult. Further, the card 50 is supported by the guide portion 22 from the side opposite to the protrusion 21 b. As a result, the pressing force acting on the card 50 from the protrusion 21 b acts strongly as a force to crush the fragments 50 a of the card 50 by the amount that the card 50 receives a reaction force from the guide 22. Urges deformation to fragment 50a. Therefore, the deformation in the thickness direction of the card 50 is increased as compared with the case where the guide portion 22 is not provided.

  (3) Before the card 50 is shredded, the fragments 50a constituting the parts adjacent to each other are accommodated in mutually different accommodating parts 40A and 40B. Therefore, it becomes difficult to find out the fragments 50a which constitute adjacent portions as one set of fragments 50a, and it becomes more difficult to connect the fragments 50a and restore the card 50.

  (4) When the projection 21b of the first cutter 21A is located in a region where a part of the first cutter 21A and a part of the second cutter 21B overlap with each other, the projection 21b of the second cutter 21B is mutually It is located outside the area that overlaps the. Therefore, the first cutter 21A and the second cutter 21B apply pressure to the card 50 by the protrusions 21b at different timings. Therefore, as compared with the case where the first cutter 21A and the second cutter 21B press the card 50 at the same timing, the stress applied to the shredding portion 20 is dispersed, so the load applied to the shredding portion 20 is reduced. Ru.

  (5) Since a gap is formed between the first cutter 21A and the second cutter 21B adjacent to each other, the card is easily cut between the first cutter 21A and the second cutter 21B.

(Modification)
The above embodiment can be modified as follows.
When viewed from the axial direction of the first rotation shaft 23, the positions of the protrusions 21b of the first cutters 21A may overlap or may be offset. Similarly, when viewed from the axial direction of the second rotation shaft 24, the positions of the protrusions 21b of each of the second cutters 21B may overlap or be offset. When the positions of the protrusions 21b are shifted, each of the first cutters 21A applies a pressing force to the card 50 at different timings, and each of the second cutters 21B presses the card 50 at different timings. give. Therefore, in order to disperse the stress generated in the shredding portion 20, it is preferable that the position of the protrusion 21b be shifted.

  -As shown in FIG. 10, the cutter 21 may include two cutter pieces 26a and 26b having the same shape as each other, and may be formed by joining these cutter pieces 26a and 26b. The cutter piece 26a includes a disk portion 27a having a disk shape, and a projection 28a projecting outward in the radial direction from the outer peripheral surface of the disk portion 27a. Similarly, the cutter piece 26b includes a disc portion 27b having a disc shape, and a projection 28b projecting outward in the radial direction from the outer peripheral surface of the disc portion 27b. The cutter piece 26a and the cutter piece 26b are joined such that the axial direction of the disk portion 27a and the axial direction of the disk portion 27b coincide with each other and the projection 28a and the projection 28b overlap when viewed from this axial direction. ing. In this case, the disc portion 21a of the cutter piece 26a and the disc portion 27b of the cutter piece 26b constitute the disc portion 21a of the cutter 21, and the projection 28a of the cutter piece 26a and the cutter piece 26b overlap when viewed from the axial direction. The protrusion 21 b of the cutter 21 constitutes one protrusion 21 b of the cutter 21.

  As shown in FIG. 11, the cutter piece 26 a and the cutter piece 26 b may be joined with the protrusion 28 a and the protrusion 28 b shifted as viewed from the axial direction. In this case, the disc portion 21a of the cutter 21 is constituted by the disc portion 27a of the cutter piece 26a and the disc portion 27b of the cutter piece 26b, and each of the projection 28a of the cutter piece 26a and the projection 28b of the cutter piece 26b is , And one protrusion 21 b of the cutter 21. That is, the cutter 21 includes the projection 28a and the projection 28b which are different from each other in the axial position of the disk 21a, and the position of the projection 28a and the position of the projection 28b are shifted when viewed from the axial direction. There is. According to such a configuration, since the projection 28 a and the projection 28 b apply pressing force to the card 50 at different timings from each other, it is possible to further disperse the stress generated in the shredding unit 20.

The total of the number of the protrusions 28a of the cutter piece 26a and the number of the protrusions 28b of the cutter piece 26b may be one or more.
The shape of the protrusion 21 b is not limited to the shape exemplified in the above embodiment. For example, as shown in FIG. 12, the protrusion 21b may be sharpened toward the tip. For example, as shown in FIG. 13, the protrusion 21b has a flat surface 25a erected on the outer peripheral surface of the disk portion 21a, and a curved surface 25b gently connecting the flat surface 25a and the outer peripheral surface of the disk portion 21a. It may be done. In this case, it is preferable that the flat surface 25a be disposed on the front side in the rotation direction of the cutter 21 than the curved surface 25b. According to such a configuration, when the protrusion 21 b presses the card 50, for example, concentration of stress on a part of the protrusion 21 b such as a connection portion between the protrusion 21 b and the disk 21 a can be suppressed. Therefore, the strength of the protrusion 21 b is enhanced.

  In addition, the protrusion 21b may not be formed in the shape of a protrusion, and the protrusion 21b may be formed on a part of the outer peripheral surface of the disk 21a in the axial direction of the disk 21a. The cross-sectional shape of the protrusion 21 b may change along the axial direction of 21 a. In addition, the protrusion 21b may be formed parallel to the axial direction along the axial direction of the disk portion 21a, or may be formed inclined with respect to the axial direction. Alternatively, the protrusion 21 b may be hemispherical. Further, the plurality of protrusions 21b of one cutter 21 may include protrusions 21b having different shapes from one another, and the plurality of cutters 21 may have the cutter 21 having protrusions 21b having different shapes and numbers. May be included. The point is that the protrusion 21b may be protruded from the outer peripheral surface of the disk 21a. In addition, it is preferable that the protrusion 21 b has a quadrangular prism shape as in the above-described embodiment because the formation of the protrusion 21 b is easy.

Further, the disk portion 21a may have a disk shape, and for example, an end of the disk portion 21a in the axial direction may be inclined on the outer peripheral surface of the disk portion 21a.
The protrusion 21b may be formed on at least one of the plurality of cutters 21. For example, at least a portion of the plurality of first cutters 21A may not have the protrusion 21b. Further, at least a part of the plurality of second cutters 21B may not have the protrusion 21b. Even in such a configuration, deformation in the thickness direction occurs in some of the fragments 50a, and hence illegal use of information possessed by the card is more effective as compared with a configuration in which all the cutters 21 do not have the protrusion 21b. It is suppressed.

  The guide portion 22 may not be provided, or may be disposed only for part of the plurality of cutters 21. Moreover, the conveyance direction of the piece 50a of the card 50 which the guide part 22 guides may be a direction different from the conveyance direction in the said embodiment.

  -The accommodating part 40 may have three or more mutually different accommodating parts. For example, for each of the cutters 21, a storage portion for storing the fragments 50a discharged by the rotation of the cutter 21 may be disposed. The point is that the housing part for housing the fragments 50a discharged by the rotation of the first cutter 21A and the housing part for housing the fragments 50a discharged by the rotation of the second cutter 21B may be different. In addition, even if the accommodating part which accommodates the fragment 50a discharged | emitted by rotation of 1st cutter 21A, and the accommodating part which accommodates the fragment 50a discharged | emitted by rotation of 2nd cutter 21B is the same accommodating part, The effects of (1), (2), (4) and (5) can be obtained.

  -When the first cutter 21A and the second cutter 21B are rotating, the protrusion 21b of the first cutter 21A and the protrusion of the second cutter 21B may be used by a part of the plurality of cutters 21. 21b may be located in the area | region where a part of 1st cutter 21A and a part of 2nd cutter 21B mutually overlap. Also with this configuration, the stress applied to the shredding unit 20 is dispersed as compared with the case where the protrusions 21 b of all the first cutters 21A and the second cutters 21B press the card 50 at the same timing. Alternatively, for all the cutters 21, a region where the protrusion 21b of the first cutter 21A and the protrusion 21b of the second cutter 21B overlap each other with a portion of the first cutter 21A and a portion of the second cutter 21B. It may be located at The effects of the above (1) to (3) and (5) can be obtained also by this configuration.

-The 1st cutter 21A and the 2nd cutter 21B which adjoin mutually may be in sliding contact in the case of these rotation. With this configuration, the card 50 can be cut.
The cross-sectional shapes of the first rotation shaft 23 and the second rotation shaft 24 viewed in the axial direction are not limited to the shapes illustrated in the above embodiment, and may be polygons different from regular hexagons, or circular It may be. If the cross-sectional shape of the rotary shafts 23 and 24 is a polygon or a combination of a curve and a straight line, the cutter 21 is rotated relative to the rotary shafts 23 and 24 compared to the case where the cross-sectional shape is circular. Since slippage is suppressed, the rotational force is efficiently transmitted from the rotary shafts 23 and 24 to the cutter 21. As a result, when the cutter 21 applies a force to the card 50, the loss of energy transmitted from the drive unit 30 is suppressed. Therefore, it is preferable that the cross-sectional shape of the rotating shafts 23 and 24 be a polygon or a shape consisting of a combination of a curve and a straight line.

  DESCRIPTION OF SYMBOLS 10 ... Card shredding apparatus, 20 ... Shredding part, 21 ... Cutter, 21A ... 1st cutter, 21B ... 2nd cutter, 22 ... Guide part, 22A ... 1st guide part, 22B ... 2nd guide part, 23 ... First rotary shaft, 24: second rotary shaft, 30: drive unit, 40: housing portion, 40A: first housing portion, 40B: second housing portion, 50: card, 50a: fragment.

Claims (5)

A card shredding device comprising a shredding unit for shredding a card having information, comprising:
The shredding unit is
A plurality of first cutters and a plurality of second cutters;
The first cutter is a cutter having a disk shape centered on a first rotation axis, and has an outer peripheral surface rotating around the first rotation axis as a main blade.
The second cutter is a cutter having a disk shape centered on a second rotation axis parallel to the first rotation axis, and is opposite to the rotation direction of the first cutter around the second rotation axis. Have an outer peripheral surface that rotates in the direction of
When viewed in the axial direction of the first rotation shaft, a portion of the outer peripheral portion of the first cutter and a portion of the outer peripheral portion of the second cutter have mutually overlapping regions, and in the mutually overlapping regions The main blade of the first cutter and the main blade of the second cutter are alternately arranged along the axial direction of the first rotation shaft, and a plurality of the first cutters and a plurality of the second cutters are alternately disposed. Configured to exert a shear force on the card entering between the cutter and
At least one of the plurality of first cutters and the plurality of cutters including the plurality of second cutters includes a secondary blade projecting from an outer peripheral surface of the cutter,
The sub-blade has a protruding square pole shape extending in the entire axial direction of the cutter on the outer peripheral surface of the cutter, and has a function of causing deformation in the thickness direction to the card Card shredding device. The shredding unit is
It further comprises a guide portion disposed between the second cutters aligned along the axial direction of the second rotation shaft and facing the main blade of the first cutter,
The card shredding device according to claim 1, wherein the guide portion extends along a rotation direction of the first cutter from a position facing a portion constituting the mutually overlapping region in the main blade. A first accommodating portion for accommodating the pieces of the card discharged by the rotation of the first cutter;
The card shredding device according to claim 2, further comprising: a second accommodating portion which is an accommodating portion different from the first accommodating portion, and accommodates a fragment of the card discharged by the rotation of the second cutter. . Each of the first cutter and the second cutter adjacent to each other in the mutually overlapping region has the sub-blade,
The sub-blades of the second cutter overlap with each other when the sub-blades of the first cutter are positioned in the overlapping region when the first cutter and the second cutter are rotating. The card shredding device according to any one of claims 1 to 3, which is located outside the area. The card shredding device according to any one of claims 1 to 4, wherein a gap is formed between the first cutter and the second cutter in the mutually overlapping region.

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