JP3970054B2 - shredder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shredder for finely chopping paper sheets. In particular, the present invention relates to a technique that takes into consideration the structure of a separator that peels shredded waste from a cutter.
[0002]
[Prior art]
The paper sheet shredder includes a cutter unit that chops the inserted paper sheet immediately below the input port for inputting the paper sheet. The cutter unit includes a pair of cutter shafts arranged in parallel so as to mesh with each other. Each cutter shaft is provided with a plurality of cutters at intervals in the axial direction of the cutter shaft. Separators for removing shredded waste are disposed between the cutters.
[0003]
In general, the cutter unit has an integrated shape shown in FIG. 10 and a single wafer shape shown in FIG. Describing these outlines, the integrated shape of FIG. 10 is mainly made of metal, and grooves 1a are cut with high precision width and pitch on the outer periphery of the cutter shaft 1 serving as a cylindrical or cylindrical shaft. Large diameter portions between 1a are processed as cutters (cutting blades) 11 and 11. A separator S is disposed between the cutters 11 and 11.
[0004]
11 has a structure in which the cutter plate 2, the distant piece 3, and the separator 4 are sequentially fitted to the outer peripheral portion of the cutter shaft 1 and both ends are stopped by a stop ring. A space between the cutter plate 2 and the cutter shaft 1 is, for example, a hexagonal cross-sectional shape, and the relative rotation between the cutter plate 2 and the cutter shaft 1 is prevented. In these drawings, reference numerals 7a and 7b denote bearings, and 8a and 8b denote synchronous gears.
[0005]
Since this single wafer shape is an assembly type, the shapes of the cutter plate 2, the separator 4 and the like can be determined relatively freely, but the structure is complicated. On the other hand, the integrated type has a simple structure, but requires high precision and special processing technology. However, this integrated type will tend to become mainstream in the future.
[0006]
By the way, in this type of shredder, paper sheets (hereinafter referred to as paper) loaded into the slot are shredded by a cutter unit disposed below the slot and then dropped into a waste box. . At that time, it is desirable that the shredded waste pieces (shredded waste) fall smoothly toward the waste box without adhering to the cutter unit.
[0007]
However, this shredded waste generally has the following properties.
(A) Shredded scraps are small pieces and lightweight, so they are easily scattered.
(B) It is not a flat piece of paper, but has an extremely bent portion and is easily caught by other portions and shredded scraps.
(C) The cut portion of the shredded scrap has many irregularities and is easily caught by an object.
[0008]
As a result, the following various problems occur in the function and performance of the shredder.
[0009]
(1) Since it enters the gap and clogs the gap in the machine, the movement is not smooth. For example, as shown in FIGS. 12 and 13, when shredded waste P1 enters between the cutter shaft 1 and the separator S, it gradually accumulates to increase the rotational resistance.
(2) When shredded waste P1 enters the gap between the side surface of the cutter 11 and the side surface of the separator S, an action of pressing the separator S against the cutter 11 side occurs. When this action increases, the separator S is rubbed on the side surface of the cutter to increase the rotational resistance. (See, for example, FIG. 10)
(3) Although the shredded waste P1 is caught by the cutter 11 and moved in the rotational direction, this action is particularly effective at the sharp edge (inclination angle θ2 in FIG. 13) of the shredded blade 11a provided on the outer periphery of the cutter. large. In this regard, in the case of the separator S shown in FIG. 13, the action of moving the shredded waste P <b> 1 upward is large, and the shredded waste P <b> 1 tends to accumulate around the cutter unit 10. Therefore, when the space shape with the case around the cutter unit is narrow, shredded debris accumulates there and may harden or fall unexpectedly. In addition, there is a possibility that smashed lump or the like is generated and the apparatus is damaged.
[0010]
A separator S shown in FIG. 14 is an example of a separator used for an integral cutter. In the single-wafer cutter, since the separator is passed through the cutter shaft 1, the outer shape of the separator can be freely taken, whereas in the integrated type, in order to obtain a separator shape that wraps the cutter shaft 1, It must be divided in two as shown in the figure. In this case, there is an advantage that the gap δ between the joints can be reduced, but the separator guide 6 is also increased, and there is a problem in that the manufacturing cost increases with an increase in the number of parts.
[0011]
[Problems to be solved by the invention]
Therefore, the problem of the present invention is to limit the behavior of shredded waste as described above, and to smoothly drop shredded waste generated to the waste bin, thereby improving the phenomenon of shredding waste and durability. An object of the present invention is to provide a shredder technique capable of improving, suppressing noise, and reducing production costs.
[0012]
[Means for Solving the Problems]
The shredder according to the present invention includes a cutter unit that shreds paper sheets by rotation, and the cutter unit includes a plurality of cutter shafts arranged in parallel to each other and spaced apart in the axial direction of each cutter shaft. And a separator that peels shredded debris from the cutter, and the separators are respectively disposed between the cutters, and each separator has a mating surface that is spaced in the circumferential direction of the cutter shaft. And between the mating surfaces, it was set as the structure in which the approach prevention means which prevents shredded waste approaching into the center side of a cutter shaft was provided.
[0013]
According to the present invention, each separator is formed with a mating surface having an interval in the circumferential direction of the cutter shaft, and between the mating surfaces, entry preventing means for preventing shredded waste from entering the cutter shaft. Is provided. Therefore, shredded waste is prevented from entering the cutter shaft side through the gap between the mating surfaces. Thereby, the behavior of shredded waste can be restricted and shredded waste can be dropped smoothly. As a result, the wrapping phenomenon of shredded waste can be improved, durability can be improved, and noise can be suppressed.
[0014]
It is desirable that the separator is formed in a plate shape that is entirely deformed by being plastically deformed so as to be wound along the circumferential direction of the cutter shaft. When the separator is configured in this way, the separator itself can be easily manufactured by punching a metal plate, and the manufacturing cost can be reduced.
[0015]
It is desirable that the shredder entry preventing means has an overlapping portion where opposing mating surfaces extend in the circumferential direction of the cutter shaft. When this overlapping portion is provided, the opposing mating surfaces are curved, so that the shredded waste does not easily enter the cutter shaft side.
[0016]
On the outer peripheral surface of the cutter, a plurality of grooved chopping blades having sharp edges for cutting paper sheets into strips are formed at intervals in the circumferential direction of the cutter, and the overlapping portion is chopped It is desirable that it is located closer to the center side of the cutter shaft than the groove bottom of the blade. By providing the overlapping portion of the facing mating surfaces closer to the cutter shaft than the groove bottom of the chopping blade, the function of the overlapping portion can be more effectively exhibited. That is, in the area of the shredded blade outside the groove bottom, the action of drawing shredded waste with the sharp edge is large. Therefore, by providing an overlapping portion at a position closer to the center side of the cutter shaft than that region, it is possible to effectively suppress the action of drawing shredded waste.
[0017]
It is desirable that the shredder entry preventing means includes a concave portion provided on one side of the mating surface and a convex portion provided on the other side and fitted into the concave portion. In this way, when a part of the intrusion prevention means is configured with a concave-convex fitting portion, it can be realized with a simple configuration like the overlapping portion.
[0018]
The angle formed by the radial line segment of the cutter and the line segment from the sharp edge of the shredded blade toward the groove bottom is θ1, and the radial line segment of the cutter and the mating surface of the separator are on the outer peripheral side of the separator When the angle formed by the line segment extending toward θ2 is θ2,
It is desirable that the relationship θ1> θ2 be set. When it sets in this way, it will become the form which the shredded waste which approached between the mating surfaces escapes easily. Accordingly, shredded scraps are unlikely to enter the mating surfaces and easily come out.
[0019]
The distance between the separator side surface and the separator guide groove formed smaller than the distance between the cutters is preferably set to 3 to 5% of the groove width of the separator guide groove or 0.03 mm to 0.09 mm. . When set in this way, the interval between the separator side surface and the groove wall of the separator guide groove is not only set to an appropriate value for preventing paper entrainment, but is also regulated so that the adjacent separator and the cutter do not contact each other. Can do.
[0020]
The position of the separation surface for separating the fine pieces of the separator is at the same level as the position of the step formed on the uppermost portion of the groove wall of the separator guide groove, or positioned closer to the center of the cutter shaft than the position of the step. It is desirable that With this configuration, it is possible to reduce the distance between the side surface of the separator and the groove wall of the separator guide groove, and more effectively set the paper roll prevention proper value.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
These drawings show an embodiment in which the present invention is applied to a shredder provided with an integrated cutter that shreds paper sheets such as paper and sheets (hereinafter abbreviated as paper). FIG. 1 is a vertical cross-sectional view of the insertion port and the cutter unit. FIG. 2 is a vertical cross-sectional view of the insertion port and the cutter unit in directions different by 90 degrees. FIG. 3 is an enlarged view of the cutter unit. FIG. 4 is a front view showing the shape of the separator before being attached to the cutter shaft, and FIG. 5 is a front view showing the shape of the separator after being attached.
[0022]
As shown in FIGS. 1 to 5, the shredder according to this embodiment includes a cutter unit 10 that shreds a bundle of paper, a paper slot inlet 20, and a housing that supports the inlet 20 ( (Exterior case) 30 and a holding device 50 for holding the inlet 20 detachably with respect to the external case 30.
[0023]
The insertion port 20 disposed above the cutter unit 10 includes an upper opening 21 that receives a bundle of paper, and a lower opening 22 that discharges (drops) the paper bundle toward the cutting portion of the cutter unit 10 by its own weight. And the whole is formed in a funnel shape. The lower opening 22 is set to a minimum opening width B in consideration of safety. The insertion port portion 20 is configured as a separate body from the outer case 30 that supports it.
[0024]
As shown in FIGS. 1 and 2, the cutter unit 10 includes a pair of cutter shafts 1, 1 arranged in parallel so as to mesh with each other. Each cutter shaft 1, 1 is provided with a plurality of cutters 11 at intervals in the axial direction of the cutter shaft 1, 1. Separators S are respectively arranged between the cutters 11. Each separator S is positioned between the cutters 11 by a plurality of separator guides 6.
[0025]
FIG. 3 is an enlarged view showing a state in which the paper bundle P is shredded by the cutter unit 10. This figure shows a state in which a bundle of paper P is drawn and is being cut at the tip of the shredder blade 11a of the cutter 11 on the right side in the figure. Below that, the state of the cutting waste P2 pushed out by the peeling surface S1 of the left separator S is shown.
[0026]
As shown in the figure, when a paper jam occurs in a state where the rear end of the bundle of paper P is at a distance G ′ above the position of the minimum inlet width B, it can be easily pulled out by grasping it. If the trailing edge of the paper bundle P is G, it is difficult to grasp it. In that case, an operation to reverse the cutter unit 10 is performed.
[0027]
As shown in FIGS. 4 and 5, each separator S is formed with mating surfaces 12 a and 12 b that are spaced apart in the circumferential direction of the cutter shaft 1, and between the mating surfaces 12 a and 12 b, shredded waste P1 is formed. An entry preventing means 13 for preventing entry to the center side of the cutter shaft 1 is provided. As will be described later, the entry preventing means 13 is formed of an overlapping portion w including a portion where the concave portion 13a and the convex portion 13b are fitted, and an inclined mating surface 12b.
[0028]
The separator S of the illustrated example is formed into a plate shape that is entirely wound along the circumferential direction of the cutter shaft 1 by plastically deforming a part thereof. That is, as shown in FIG. 4, the separator S is formed with a thin hinge portion 14 that can be plastically deformed. By configuring the separator S in this way, the separator S itself can be easily manufactured by punching a metal plate.
[0029]
Thereby, the manufacturing cost of the separator S can be reduced. Since the number of separators S used is large, it is effective for cost reduction. The gap is formed between the mating surfaces 12a and 12b because the mating surfaces 12a and 12b are separated due to the elastic action (spring back function) of the thin hinge portion 14 remaining after plastic deformation. Yes.
[0030]
As shown in FIG. 4, the guide hole 15 through which the cutter shaft 1 of the separator S passes has a shape that is divided in half and opened on one side. In FIG. 4, reference numeral 16 indicates a through hole of the separator guide 6.
[0031]
The intrusion prevention means 13 for the shredded waste P1 has an overlapping portion w shown in FIG. 3 formed by the opposing mating surfaces 12a, 12b extending in the circumferential direction of the cutter shaft 1. When the overlapping portion w is provided, the opposing mating surfaces 12a and 12b are curved, so that the shredded waste P1 is difficult to enter the cutter shaft 1 side. That is, the opposing mating surfaces 12 a and 12 b extend in the circumferential direction of the cutter shaft 1 and then extend in the radial direction of the cutter shaft 1. Thus, the reason why the facing mating surfaces 12a and 12b are curved is due to the presence of the recesses 13a and the projections 13b that fit together.
[0032]
Accordingly, the overlapping portion w of the entry preventing means 13 in the illustrated example is, in other words, formed by the concave portion 13a provided on the mating surface 12a side and the convex portion 13b provided on the mating surface 12b side and fitted into the concave portion 13a. Has been. The reason why the overlapping portion w of the intrusion preventing means 13 is configured by the portion where the concave and convex portions are fitted is that the overlapping portion w can be realized with a simple configuration.
[0033]
On the outer peripheral surface of the cutter 11, a plurality of grooved chopping blades 11 a having sharp edges for cutting the paper sheet P into strips are formed at intervals in the circumferential direction of the cutter 11. And the overlapping part w is formed so that it may be located in the cutter shaft 1 side rather than the groove bottom 11b of the shredder blade 11a. This is because by providing the overlapping portion w of the opposing mating surfaces 12a and 12b closer to the cutter shaft 1 than the groove bottom 11b of the chopping blade 11a, the function of the overlapping portion w can be more effectively exhibited.
[0034]
That is, in the region of the chopping blade 11a outside the groove bottom 11b, the action of drawing the chopping waste P1 by the sharp blade edge is great. Therefore, by providing the overlapping portion w at a position closer to the cutter shaft 1 side than that region, it is possible to effectively suppress the action of drawing the shredded waste P1.
[0035]
As shown in FIG. 1, the mating surface 12 b that constitutes the approach preventing means 13 together with the overlapping portion w is greatly inclined to the forward rotation side of the cutter shaft 1 and narrower than the radial line segment of the cutter shaft 1. The following relationship is set with the cutting blade 11a.
[0036]
The angle formed by the radial line segment of the cutter 11 and the line segment from the sharp cutting edge of the chopping blade 11a toward the groove bottom 11b is θ1, the mating surface 12b of the radial line segment of the cutter 11 and the separator S is the separator S When the angle formed by the line segment extending toward the outer peripheral side is θ2, the relationship θ1> θ2 is set. By setting in this way, the shredded waste P1 that has entered between the mating surfaces 12a and 12b is easily removed. Therefore, between the mating surfaces 12a and 12b, the shredded waste P1 is difficult to enter and can be easily removed.
[0037]
In this regard, when the mating surfaces 12a and 12b of the separator S are formed as shown in FIG. 6, as shown in FIGS. 1, 5, etc., the shredding is performed more than in the case where the relationship of θ1> θ2 is set. The scrap P1 is easy to enter between the mating surfaces 12a and 12b, and is difficult to escape. This is the same reason as described in FIG. However, in the example shown in FIG. 6, since the concave portion 13 a and the convex portion 13 b fitted therein are provided, this portion constitutes the intrusion preventing means 13. Therefore, also in this example, the effect of preventing the shredded waste P1 from entering is obtained.
[0038]
In FIG. 1, R1 is the outer radius of the cutter 11, R2 is the radius to the groove bottom of the chopping blade 11a, R3 is the large radius portion of the separator overlap portion w, and R4 is the small radius portion of the separator overlap portion w. Respectively.
[0039]
7 and 8 are a longitudinal sectional view and a transverse sectional view for clearly showing the groove (interval) between the cutters 11 and the separator guide groove 17. The separator guide groove 17 is the groove closest to the center side of the cutter shaft 1, and the separator S is disposed between the separator guide groove 17 with a high-precision gap between the groove bottom and the groove wall. .
[0040]
As shown in FIG. 9A, when the groove width of the separator guide groove 17 formed smaller than the interval between the cutters 11 is X and the thickness of the separator S is Y, the side surface of the separator S and the separator guide groove The distance δ1 = (XY) / 2 from the groove wall 17 is set to 3 to 5% of the groove width of the separator guide groove 17 or 0.03 mm to 0.09 mm.
[0041]
By setting in this way, the interval δ1 between the side surface of the separator S and the groove wall of the separator guide groove 17 is not only set to an appropriate value for preventing paper entrainment, but also the adjacent separator S and the cutter 11 It can be regulated not to touch. These numerical values are obtained from experimental results, but the following reasons can be considered.
[0042]
When the paper bundle P is excessively fed during shredding, the cutter unit 10 is reversed to return the jammed paper bundle P to the hand, and then the paper amount is reduced and the paper bundle P is reloaded. Then, the tip portion that was previously shredded was cut again with a cutter to become a further finely cut fine piece P2, which had the problem of entering the gap δ1. In this regard, such problems can be positively prevented by adopting the numerical values obtained from the above experimental results. That is, in the relationship between the interval δ1 and the thickness t1 of the fine piece P2, the interval δ1 can be set to an appropriate value for preventing paper entrainment by satisfying at least the relationship of δ1 <t1.
[0043]
Further, the depth of the separator guide groove 17 is from the stepped portion 17a on both sides to the groove bottom where the interval between the cutters 11 and 11 is narrowed near the groove bottom. The relationship with the height R5 of the peeling surface (surface for peeling the fine pieces) S1 is also considered as follows. This consideration is for more effectively preventing the fine piece P2 from entering the gap δ1. Here, R5 indicates the distance from the axis 1c of the cutter shaft 1 to the peeling surface S1 (the radial distance of the cutter shaft 1).
[0044]
That is, as shown in FIG. 9B, the separation surface S1 of the separator S is positioned closer to the groove bottom than the step 17a of the separator guide groove 17 by the step t2, or as shown in FIG. 9A. Are set at almost the same level. More preferably, it is the form shown in FIG. The step t2 is not particularly limited. However, it is necessary to consider that the thickness between the guide hole 15 through which the cutter shaft 1 passes and the peeling surface S1 (thickness of the thin hinge portion 14) does not become too thin.
[0045]
In the embodiment, each separator S is formed with mating surfaces 12a and 12b having a gap in the circumferential direction of the cutter shaft 1, and between the mating surfaces 12a and 12b, shredded waste P1 and P2 are disposed on the cutter shaft 1. Intrusion prevention means 13 is provided to prevent entry in this direction (the groove bottom direction of separator guide groove 17). Accordingly, the shredded waste P1, P2 is prevented from entering the cutter shaft 1 through the gap between the mating surfaces 12a, 12b. Thereby, the behavior of shredded waste can be restricted and shredded waste can be dropped smoothly. As a result, the wrapping phenomenon of shredded waste can be improved, durability can be improved, and noise can be suppressed.
[0046]
【The invention's effect】
As described above, according to the shredder of the present invention, between the mating surfaces formed on the separator, by providing an entry preventing means for preventing shredded waste from entering the cutter shaft side, the behavior of shredded waste can be improved. The generated shredded waste can be smoothly dropped into the waste bin. Thereby, the winding phenomenon of shredded waste can be improved, durability improvement, noise suppression, production cost reduction, etc. can be aimed at.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a shredder according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a main part of a shredder according to an embodiment of the present invention.
FIG. 3 is an enlarged view of the cutter unit of the shredder according to the embodiment of the present invention.
FIG. 4 is a front view of the separator before being mounted on the cutter shaft of the shredder according to the embodiment of the present invention.
FIG. 5 is a front view of the separator after being mounted on the cutter shaft of the shredder according to the embodiment of the present invention.
FIG. 6 is a front view showing another example of the mating surface of the separator according to the embodiment of the present invention.
FIG. 7 is a longitudinal sectional view of the cutter unit of the shredder according to the embodiment of the present invention.
FIG. 8 is a cross-sectional view of the cutter unit of the shredder according to the embodiment of the present invention.
FIG. 9 is an enlarged cross-sectional view of the main part of the cutter unit of the shredder according to the embodiment of the present invention.
FIG. 10 is a cross-sectional view showing a configuration of an existing cutter unit (integral type).
FIG. 11 is a cross-sectional view showing a configuration of an existing cutter unit (single-wafer shape).
FIG. 12 is a front view showing a configuration of an existing separator.
FIG. 13 is a front view showing a configuration of an existing separator.
FIG. 14 is a front view showing a configuration of an existing separator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutter axis | shaft 2 Cutter plate 4 Separator 6 Separator guide 10 Cutter unit 11 Cutter 11a Shred blade 12a, 12b Matching surface 13 Intrusion prevention means 13a Concavity 13b Convex part 14 Thin hinge part 15 Guide hole 16 Through hole 17 Separator guide groove 17a Step Portion 20 Loading Port 21 Upper Opening 22 Lower Opening 24 Inner Side 25 Flange 30 Exterior Case 50 Holding Device S Separator S1 Peeling Surface P Paper Bundles P1, P2 Fine Pieces

Claims (8)

The cutter unit includes a cutter unit that shreds paper sheets by rotation. The cutter unit includes a plurality of cutter shafts arranged in parallel to each other, a plurality of cutters spaced apart in the axial direction of each cutter shaft, and shredded waste. A shredder having a separator that peels from the cutter,
The separators are respectively disposed between the cutters, and each separator is formed with a mating surface having an interval in the circumferential direction of the cutter shaft, and the shredded waste is between the mating surfaces of the cutter shaft. A shredder provided with an entry preventing means for preventing entry to the center side. The shredder according to claim 1, wherein the separator is formed in a plate shape in which a part thereof is plastically deformed to be wound along the circumferential direction of the cutter shaft. The shredder according to claim 1, wherein the shredder entry preventing means includes an overlapping portion where opposing mating surfaces extend in a circumferential direction of the cutter shaft. On the outer peripheral surface of the cutter, a plurality of grooved chopping blades having an acute edge for cutting paper sheets into strips are formed at intervals in the circumferential direction of the cutter, and the overlapping part is The shredder according to claim 3, wherein the shredder is located closer to the center side of the cutter shaft than the groove bottom of the shredded blade. The shredder according to claim 1, wherein the shredder entry preventing means includes a concave portion provided on one side of the mating surface and a convex portion provided on the other side and fitted into the concave portion. The angle formed by the radial line segment of the cutter and the line segment from the sharp cutting edge of the shredded blade toward the groove bottom is θ1, and the radial line segment of the cutter and the mating surface of the separator are on the outer peripheral side of the separator The shredder according to claim 1, wherein θ1> θ2 is set as a relationship where θ2 is an angle formed by a line segment extending toward. The interval between the separator side surface and the separator guide groove formed smaller than the interval between the cutters is set to 3 to 5% of the groove width of the separator guide groove or 0.03 mm to 0.09 mm. The shredder according to claim 1. The position of the separation surface of the separator for separating the fine fragments is at the same level as the position of the step formed on the uppermost portion of the groove wall of the separator guide groove, or the position of the cutter shaft than the position of the step. The shredder according to claim 7, which is located toward the center side.

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