JP4338828B2 - Paper shredding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper shredding device (shredder) for shredding discarded documents and the like, and particularly to a pair of cutter rollers.
[0002]
[Prior art]
The paper shredding device is a device that shreds a document or the like in order to maintain confidentiality of the document or the like to be discarded. A general paper shredding device passes a paper sheet between rotating blades of a pair of cutter rollers that mesh with each other, and shreds the paper sheet in a longitudinal direction into a line having a width of several millimeters. In addition, depending on the apparatus, what is cut in the vertical direction is further cut in the horizontal direction by a rotating spiral cutter and a fixed flat cutter.
[0003]
FIG. 3 shows a pair of conventional cutter rollers 103 and 104 that are not loaded with paper sheets to be shredded. The cutter roller 103 has cutter shafts (rotating shafts) 105 and 106, respectively. The rotating shafts 105 and 106 are rotatably held by bearings 130 and 131, 132 and 133. The rotary blades 103a and a plurality of 104a are fixed so as to mesh with each other. The plurality of rotary blades 103a,... And the plurality of 104a,... All have a diameter D, are arranged in a cylindrical shape, and have a meshing amount d with each other.
[0004]
In a state where the paper sheets to be shredded are not loaded, the contour line 103b formed by arranging the plurality of rotary blades 104a... In a cylindrical shape forms a straight line as shown in FIG. Yes. FIG. 3B schematically shows a scissors state formed by the rotary blade 103b and the rotary blade 104a.
[0005]
Next, with reference to FIG. 4, a state in which a sheet to be shredded is loaded on the conventional pair of cutter rollers 103 and 104 will be described. When the sheets to be shredded are loaded and the number of sheets increases, the plurality of rotating blades 103a and the plurality of 104a that mesh with each other receive a large force in a direction away from each other. Since each of the pair of cutter rollers 103 and 104 is fixed and held at bearings 130, 131, 132, and 133 at both ends, the rotary blade 103a and the rotary blade 104a are separated from each other as indicated by arrows A and B. When a large force is received, the rotating shaft 105 of the cutter roller 103 undergoes axial deflection as indicated by a dotted line 105a, and similarly, the rotational shaft 106 of the cutter roller 104 causes axial deflection as indicated by a dotted line 106a. As a result, in the state in which the paper sheets to be shredded are loaded, the contour line 103b formed by arranging the plurality of rotary blades 103a ... in a cylindrical shape is as shown in FIG. It has an arc shape.
[0006]
[Problems to be solved by the invention]
When the shafts 105 and 106 are bent as shown in FIG. 4, the amount of engagement d between the rotary blade 103a and the rotary blade 104a is smaller in the center than in a portion close to the bearing 130 or the like. As a result, the positions where the rotary blades 103a and 104a bite on the paper sheets are shifted so as to draw an arc as shown in FIG. 4B, and the paper sheets cannot be drawn straight and straight. Then, there is a movement in which the paper sheets are drawn from the both end portions of the rotating shafts 105 and 106 to the central portion.
[0007]
As a result, the paper sheets are attracted from both end portions of the rotating shafts 105 and 106 toward the central portion every time shredding progresses, and the paper sheets are gathered so as to gradually overlap. Then, the central portion of the paper sheet is folded and partially bulges to a thickness of, for example, nearly three times. And the torque required for shredding increases greatly, and it becomes impossible to shred even the number of sheets that can be shredded.
[0008]
Further, even if the thick portion that has been gathered in the center of the paper sheet is shredded, it is necessary to pass through the rotary blade 103a and the rotary blade 104a in order to collect the shredded material. . In this case, a cutter partition plate is disposed between the rotary blade 103a and the rotary blade 103a, and between the rotary blade 104a and the rotary blade 104a, but the shredded material is shredded by the rotary blade 103a and the rotary blade 104a. In order to collect the shredded material by passing it, it is necessary to set a large interval between the rotary blade 103a and the rotary blade 104a and the counterpart cutter partition plate. For this reason, the diameter of the rotary blade 103a and the rotary blade 104a is increased. There is a problem that the size of the main body of the paper shredding device is inevitably increased.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems of the prior art, avoid paper jamming at the center of a paper sheet caused by bending occurring on a cutter shaft (rotating shaft), and reduce the size of the apparatus main body. It is to provide a leaf shredding device.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a paper shredding device according to the present invention comprises a pair of cylindrical cutter rollers each having a rotating shaft and formed with a plurality of rotary blades so as to mesh with each other, and the pair of cutter rollers. Each of the cutter rollers has a radial distance from the shaft center of the rotary shaft to the rotary blade from the vicinity of the bearing toward the central portion of the rotary shaft. It is characterized by being formed so as to increase.
[0011]
The distribution of the radial distance in which the radial distance increases from the vicinity of the bearing toward the center of the rotary shaft in the direction of the rotary shaft is the amount of shaft deflection that occurs in the rotary shaft when shredding at the maximum rating. Is preferably set to be approximately equal to the distribution with respect to the rotation axis direction.
[0012]
In each of the cutter rollers, it is preferable that the radial distance from the axis of the rotating shaft to the rotating blade is increased in an arc shape from the vicinity of the bearing toward the center of the rotating shaft.
[0013]
Moreover, it is preferable that the plurality of rotary blades of each cutter roller are formed by cutting from a single round steel material.
[0014]
In the above-described invention, the distribution of the diameters of the plurality of rotary blades (twice the radial distance from the axis of the rotary shaft) from the central portion to the end portion of the rotary shaft is made substantially larger at the central portion. The amount of meshing of the rotary blades of a pair of cutter rollers can be made linearly uniform from the center to the end of the rotating shaft in a state where the power paper is loaded. Can be pulled straight, and as a result, no wrinkles occur in the center of the paper sheet, and it is possible to reliably shred the paper sheet with the thickness within the maximum rating become. And it becomes unnecessary to make the clearance gap between a rotary blade and a cutter partition plate large more than needed, the diameter of a rotary blade can be made into the required minimum magnitude | size, and a paper sheet shredding apparatus main body dimension can be made small and lightweight.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a paper sheet shredding device according to the present invention will be described with reference to the drawings.
[0016]
As shown in FIG. 5, the paper shredding apparatus main body 1 is provided with an inlet 2 for feeding paper to be shredded obliquely on the upper surface thereof, and two cutter rollers 3 are provided inside the inlet 2. , 4 are engaged so that the rear end portion of the insertion port 2 is just opposite to the engagement portion. As shown in FIG. 6, the cutter rollers 3 and 4 are obtained by attaching a plurality of disk-shaped rotating blades 3 a, 4 a,. Since the plurality of rotary blades 3a, 4a,... Are cut out from one round steel material as will be described later, they are integrally formed.
[0017]
Cutter partition plates 27 and 28 are disposed between the rotary blades 3a and 3a and between the rotary blades 4a and 4a. The shredded material cut by the cutter rollers 3 and 4 passes through a gap between the rotary blade 3a and the counterpart cutter partition plate 28 or a gap between the rotary blade 4a and the counterpart cutter partition plate 27. Then, it is sent to a lateral cutter device 7 to be described later. The gap between the rotary blade 3a and the cutter partition plate 28 or the gap between the rotary blade 4a and the cutter partition plate 27 has a larger thickness of the shredded material cut by the cutter rollers 3 and 4. In this case, it is necessary to increase the diameters of the rotary blade 3a and the rotary blade 4a.
[0018]
Further, the above-described lateral cutter device 7 is provided at a position below the meshing portion of the cutter rollers 3 and 4. The lateral cutter device 7 includes a spiral cutter 8 having a spiral blade and a flat cutter 9. As shown in FIG. 7, the spiral cutter 8 has a shaft 10 provided with a spiral cutter blade 11. Further, the flat cutter 9 has a flat cutter blade 19 having a shape such as a triangular cross section at the tip.
[0019]
The cutter rollers 3 and 4 and the spiral cutter 8 are driven and rotated by a motor 13. A gear 12 is coaxially attached to the motor 13, and the driving force of the motor 13 is transmitted to the gear 14 disposed coaxially with the cutter roller 3 by the gear 12 to drive the cutter rollers 3 and 4. Further, the rotation of the gear 12 is transmitted to a gear 15 disposed coaxially with the rotating shaft 10 of the spiral cutter 8, and the spiral cutter 8 is driven. The motor 13 has an output of about several hundred watts.
[0020]
When a sheet is inserted from the insertion slot 2, the sheet input sensor detects this and the motor 13 is automatically activated. As a result, the cutter rollers 3 and 4 and the spiral cutter 8 rotate. The inserted paper sheets are shredded by the cutter rollers 3 and 4 in the vertical direction, for example, in a line shape having a width of about 3 mm to 6 mm. The paper sheets cut into linear shapes are guided into the horizontal cutter device 7 and further cut short in the horizontal direction. The cutting length is defined by the number of revolutions of the spiral cutter 8, but is about 10 mm to 35 mm. The paper sheets (chopped scraps) finely cut in this way fall into a waste container 16 provided at the lower part of the apparatus.
[0021]
In the paper shredding device described above, in the present invention, the pair of cutter rollers 3 and 4 are arranged from the axis of each of the rotary shafts 5 and 6 to the plurality of rotary blades 3a and the plurality of rotary blades 4a. It is formed such that the radial distance increases from the vicinity of the bearings 30, 31, 32, 33 toward the center of the cutter shafts (rotating shafts) 5, 6.
[0022]
A specific embodiment will be described below with reference to FIGS.
[0023]
FIG. 3 shows a pair of cutter rollers 3 and 4 that are not loaded with paper sheets to be shredded. The rotary shafts 5 and 6 of the cutter roller 3 are rotatably supported by bearings 30 and 31, 32 and 33. The rotary shafts 5 and 6 have a plurality of rotary blades 3a and a plurality of 4a and so on. It is fixed so as to mesh with each other.
[0024]
In a state in which the paper sheets to be shredded are not loaded, the diameter D of the plurality of rotary blades 3a and 4a is the largest in the rotary blades 3a and 4a at the center of the rotary shafts 5 and 6, It becomes smaller as it approaches the ends of the rotating shafts 5 and 6. The entirety of the cutter rollers 3 and 4 has an arcuate or drum-like contour line in which the central part is swollen.
[0025]
The difference between the diameter D of the rotary blades 3a and 4a at the center and the diameter D of the rotary blades 3a and 4a at the ends of the rotary shafts 5 and 6 is, for example, about 0.5 mm to 2 mm. The length from one rotary blade 3a, 4a to the rotary blade 3a, 4a at the end of the rotary shaft 5, 6 is about 15 cm to about 20 cm.
[0026]
The meshing amount d of the plurality of rotary blades 3a,... And the plurality of 4a,... Is not uniform and is the largest at the central part of the rotary shafts 5 and 6, and becomes smaller as approaching both ends of the rotary shafts It has become. An outline 3b formed by arranging a plurality of rotary blades 4a... In a cylindrical shape has an arc shape as shown in FIG. FIG. 1B schematically shows a scissors state where the rotary blade is formed by 3a and the rotary blade 4a.
[0027]
Further, the way of increasing the diameter D of the rotary blades 3a, 4a from both ends of the rotary shafts 5, 6 to the central part of the rotary shafts 5, 6 is the same as that of the rotary shafts 5, 6 when chopping at the maximum rating. Is set so as to be substantially equal to the distribution of the amount of axial deflection occurring in
[0028]
Such cutter rollers 3 and 4 are cut out from a single round steel material, and a plurality of rotary blades 3a... Or a plurality of 4a. Accordingly, the cutter rollers 3 and 4 can be efficiently formed instead of manufacturing and assembling a plurality of types of rotary blades 3a and 4a having different diameters D one by one.
[0029]
Next, with reference to FIG. 2, the state in which the paper sheets to be shredded are loaded on the pair of cutter rollers 3 and 4 will be described.
[0030]
When the sheets to be shredded are loaded and the number of sheets increases, the plurality of rotating blades 3a and the plurality of 4a that mesh with each other receive a large force in a direction away from each other. Since each of the pair of cutter rollers 3 and 4 is fixed and held at bearings 30 and 31, 32 and 33 at both ends, the rotary blade 3a and the rotary blade 4a receive a large force in a direction away from each other. As a result, the rotating shaft 5 of the cutter roller 3 causes an axial deflection as indicated by a dotted line 5a, and similarly, the rotating shaft 6 of the cutter roller 4 causes an axial deflection as indicated by a dotted line 6a.
[0031]
The distribution from the central part to the end part of the rotary shafts 5 and 6 having the diameter D of the plurality of rotary blades 3a and 4a is set so as to be substantially equal to the distribution of the amount of axial deflection. The meshing amount d is uniformly equal as shown in FIG. As a result, the position at which the rotary blades 3a, 4a bite into the paper sheet is linear as shown in FIG. 2B, so that the paper sheet can be drawn linearly straight.
[0032]
The cutter rollers 3 and 4 can prevent the paper sheets from being drawn from the both end portions of the rotary shafts 105 and 106 to the central portion as in the conventional cutter rollers 103 and 104. In addition, every time the paper sheet is shredded, the paper sheet is drawn from both ends toward the central part, and no overlapping wrinkles occur. There is no such thing as swelling. And it is possible to avoid that the torque required for shredding greatly increases beyond the maximum rating, and it becomes impossible to shred even the number of sheets that can be shredded originally. Nothing will happen.
[0033]
In addition, since the sheet does not become thicker due to wrinkling at the center of the paper sheet, the gap interval between the rotary blade 3a and the cutter partition plate 28 or the gap interval between the rotary blade 4a and the cutter partition plate 27 is set. There is no need to make it larger than necessary. As a result, it is not necessary to increase the diameters of the rotary blade 3a and the rotary blade 4a more than necessary, and the main body size of the paper sheet shredding device can be set small.
[0034]
As described above, according to the above-described embodiment, the distribution from the central portion to the end portion of the rotary shafts 5 and 6 having the diameter D of the plurality of rotary blades 3a. Since it is set so as to be almost equal to the distribution of the amount of axial deflection at the time of cutting, the amount of meshing d between the rotation shafts 5 and 6 from the center to the end when the paper sheets to be shredded are loaded. The sheet can be drawn linearly and straightly. As a result, no wrinkles occur in the central portion of the paper sheet, and it is possible to reliably shred the paper sheet having a thickness within the maximum rating.
[0035]
Further, since it is not necessary to make the gap interval between the rotary blade 3a and the cutter partition plate 28 or the gap interval between the rotary blade 4a and the cutter partition plate 27 larger than necessary, the rotary blade 3a and the rotary blade 4a The diameter can be set to the minimum required size. As a result, the size of the main body of the paper shredding device can be made smaller and lighter, the installation area of the paper shredding device can be made smaller, and the manufacturing cost of the device can be reduced.
[0036]
In the above description, the entire cutter rollers 3 and 4 have an arcuate or drum-like contour line in which the central portion is swollen. However, if the amount of axial deflection can be effectively subtracted, the arcuate or drum It is not limited to the contour line shape, but may be another contour line.
[0037]
In the above description, the horizontal cutter device 7 is provided below the meshing portion of the cutter rollers 3 and 4. However, the paper shredding device according to the present invention is not necessarily limited to the horizontal cutter device 7. May not be provided.
[0038]
【The invention's effect】
As described above, according to the configuration of the present invention, the pair of cutter rollers are formed such that the radial distance from the axis of the rotating shaft to the rotating blade increases from the vicinity of the bearing toward the center of the rotating shaft. Therefore, it is possible to avoid wrinkling at the center of the paper sheet due to the axial deflection of the rotating shaft, and it is not necessary to make the diameter of the rotating blade larger than necessary, and the apparatus main body can be downsized.
[Brief description of the drawings]
FIG. 1A is a diagram showing a distribution of diameters of rotating blades of a pair of cutter rollers in a rotation axis direction of a paper shredding device according to the present invention in a state where a paper sheet is not loaded, and FIG. The figure which shows the outline formed with the some rotary blade in the state which is not performed.
FIG. 2A is a diagram illustrating a distribution in a rotation axis direction of a diameter of a rotary blade of a pair of cutter rollers in a paper shredding device according to the present invention in a state where a paper sheet is loaded, and FIG. The figure which shows the outline formed with the some rotary blade in the loaded state (b).
FIG. 3A is a diagram showing the distribution of the diameters of the rotary blades of a pair of cutter rollers of a conventional paper sheet shredding device in the direction of the rotation axis in a state where no paper sheet is loaded, and a state where no paper sheet is loaded The figure which shows the outline formed with the some rotary blade in (b).
FIG. 4A is a diagram illustrating a distribution of the diameters of the rotary blades of a pair of cutter rollers of a conventional paper sheet shredding device in the direction of the rotation axis when the paper sheets are loaded, and FIG. The figure which shows the outline formed with the some rotary blade in the state (b).
FIG. 5 is a view showing the upper inside of the paper sheet shredding device.
FIG. 6 is a view showing a pair of cutter rollers.
FIG. 7 is a view showing a spiral cutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper sheet shredding apparatus main body 2 Input port 3, 4 Cutter rollers 3a, 4a Rotating blade 3b Contour line 5, 6 Rotating shaft 8 Spiral cutter 9 Flat cutter 11 Cutter blades 27, 28 of spiral cutter Cutter partition plates 30, 31, 32, 33 bearings

Claims (2)

A pair of cylindrical cutter rollers having a rotating shaft and formed with a plurality of rotating blades so as to mesh with each other;
A bearing for rotatably holding the rotation shaft of each of the pair of cutter rollers;
A paper shredding device Ru provided with,
Each of the cutter rollers is formed such that the radial distance from the axis of the rotary shaft to the rotary blade increases from the vicinity of the bearing toward the center of the rotary shaft ,
Each of the cutter rollers has a radial distance from the axis of the rotary shaft to the rotary blade increasing in an arc shape from the vicinity of the bearing toward the center of the rotary shaft,
The distribution of the radial distance that increases in a circular arc shape from the vicinity of the bearing toward the center of the rotating shaft in the rotating shaft direction corresponds to the maximum shredding amount that is set to be allowable in the paper sheet shredding device. A paper shredding device , wherein the amount of axial deflection generated in the rotary shaft when shredding at the maximum rating is set to be equal to the distribution in the direction of the rotary shaft .   2. The paper sheet shredding device according to claim 1, wherein the plurality of rotary blades of each cutter roller are cut and formed from a single round steel material.

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