JP2003251209A - Shredder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the coiling round phenomenon of shredded waste and to aim at improvement in durability, noise suppression, the reduction of a manufacturing cost, etc., by limiting the behavior of the shredded waste and dropping the produced shredded waste to a waste box smoothly. <P>SOLUTION: A shredder is provided with a cutter unit 10 for shredding paper sheets P by rotation. The cutter unit 10 is provided with cutter shafts 1 arranged in parallel to each other, a plurality of cutters 11 arranged with an interval in the axial direction of each cutter shaft 1, and separators S which releases shredded waste P1 from the cutters. The separators S are arranged between the cutters 11 respectively, mating faces 12a and 12b having clearance in the circumferential direction of the cutter shafts 1 and formed for each separator S, and a prevention means 13 which prevents shredded waste P1 from entering to the cutter shaft side is provided between the mating faces. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a shredder for shredding paper sheets into small pieces. In particular, the present invention relates to a technique that considers the structure of a separator that separates shredded waste from a cutter.

[0002]

2. Description of the Related Art Paper sheet shredders are equipped with a cutter unit for shredding the inserted paper sheets just below an input port for inserting the paper sheets. The cutter unit includes a pair of cutter shafts arranged in parallel with each other 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 dust are arranged between the cutters.

This cutter unit generally has the structure shown in FIG.
There are an integral type shown in 0 and a sheet type shown in FIG. Explaining these outlines, the integrated type of FIG. 10 is mainly made of metal, and the grooves 1a are cut with a highly accurate width and pitch on the outer periphery of the cutter shaft 1 which is a cylindrical or cylindrical shaft, and each groove 1
The large diameter portion between a and 1a is processed as cutters (cutting blades) 11, 11. A separator S is arranged between the cutters 11, 11.

The sheet-fed type shown in FIG. 11 has a structure in which a cutter plate 2, a distant piece 3 and a separator 4 are sequentially fitted to the outer peripheral portion of a cutter shaft 1 and both ends are stopped by stop rings. The section between the cutter plate 2 and the cutter shaft 1 has, for example, a hexagonal cross-sectional shape, and is configured to prevent relative rotation between the cutter plate 2 and the cutter shaft 1. In these figures, 7a and 7b indicate bearings, and 8a and 8b indicate synchronous gears.

Since this single-wafer type is an assembling type, the shapes of the cutter plate 2, the separator 4, etc. can be determined relatively freely, but the structure is complicated. On the other hand, the integrated type is
The structure is simple, but high precision and special processing technology are required. However, this integrated type tends to become the mainstream in the future.

By the way, in this type of shredder, the paper sheets (hereinafter referred to as paper) thrown into the throw-in port are shredded by a cutter unit arranged below the throw-in port, and then are thrown into a waste box. And fall. At this time, it is desirable that the shredded scrap pieces (shredded scraps) smoothly drop toward the scrap box without adhering to the cutter unit.

However, the shredded chips generally have 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 curved portion and is easily caught by other portions and shredded waste. (C) The cut portion of the shredded waste has many irregularities and is easily caught by an object.

As a result, the following various problems occur in the function and performance of the shredder.

(1) Since it enters the gap and clogs the gap of the machine, the movement is not smooth. For example, as shown in FIGS. 12 and 13, when the shredded scraps P1 enter between the cutter shaft 1 and the separator S, the shredded scraps P are gradually accumulated and the rotational resistance is increased. (2) When the shredded waste P1 enters the gap between the side surface of the cutter 11 and the side surface of the separator S, the separator S is pressed against the cutter 11 side. When this action is increased, the side surface of the cutter is rubbed against the separator S to increase the rotation resistance. (For example, refer to FIG. 10) (3) The shredded waste P1 is caught by the cutter 11 and is dragged in the rotation direction to move. θ
This effect is large in 2). In this respect, in the case of the separator S shown in FIG. 13, the action of moving the shredder P1 upward is large, and the shredder P1 tends to be accumulated around the cutter unit 10. Therefore, if the space around the cutter unit is narrow, the shredded chips may accumulate and harden, or may drop at an unexpected time. Further, there is a possibility that the chips and the like will be aggregated and damage the device.

The separator S shown in FIG. 14 is an example of a separator used in an integrated cutter. In the single-wafer type cutter, the separator is passed through the cutter shaft 1. Therefore, the outer shape of the separator can be freely selected. It must be divided in two as shown. In that case, there is an advantage that the gap δ between the seams can be reduced, but there is a problem that the number of the separator guides 6 increases and the manufacturing cost increases due to an increase in the number of parts.

[0011]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to limit the behavior of the above-mentioned shredded scraps and to smoothly drop the shredded scraps that have been generated into the scrap box. It is an object of the present invention to provide a technology of a shredder capable of improving the winding phenomenon, improving durability, suppressing noise, and reducing manufacturing cost.

[0012]

A shredder according to the present invention comprises a cutter unit for shredding paper sheets by rotation, the cutter unit comprising cutter shafts arranged in parallel with each other and an axial direction of each cutter shaft. A shredder having a plurality of cutters provided at intervals and a separator for separating shredded scraps from the cutter, wherein the separators are arranged between the cutters, and each separator has a circumferential direction of the cutter shaft. A mating surface having a space is formed between the mating surfaces, and an intrusion preventing means is provided between the mating surfaces to prevent shredded dust from entering the center of the cutter shaft.

According to the present invention, each separator is formed with a mating surface having a space in the circumferential direction of the cutter shaft, and shredder dust is prevented from entering between the mating surfaces in the direction of the cutter shaft. Ingress prevention means are provided. Therefore, shreds are prevented from entering the cutter shaft side through the gap between the mating surfaces. Thereby, the behavior of the shredded chips can be limited, and the shredded chips can be smoothly dropped. As a result, it is possible to improve the winding phenomenon of shredded waste, improve durability, and suppress noise.

It is desirable that the separator is formed into a plate shape in which the whole is wound along the circumferential direction of the cutter shaft by plastically deforming a part of the separator. 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.

It is preferable that the cutting dust invasion preventing means has an overlapping portion where the opposing mating surfaces extend in the circumferential direction of the cutter shaft and overlap each other. When this overlapping portion is provided, the opposing mating surfaces are curved, so
The shape makes it difficult for shredded chips to enter the cutter shaft side.

On the outer peripheral surface of the cutter, a plurality of chopping blades with grooves having sharp blade edges for cutting the paper sheets into strips are formed at intervals in the circumferential direction of the cutter, and the overlapping portion is formed. It is desirable to be located closer to the center of the cutter shaft than the groove bottom of the shredding blade. By providing the overlapping portion of the facing mating surfaces closer to the cutter shaft than the groove bottom of the shredding blade, the function of the overlapping portion can be more effectively exerted. That is, in the region of the shredding blades outside the groove bottom, the sharp cutting edge has a great effect of drawing shredded chips. Therefore, by providing the 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 the shredded chips.

It is desirable that the means for preventing the intrusion of shredded dust includes a recess provided on one of the mating surfaces and a projection provided on the other and fitted into the recess. When a part of the ingress prevention means is thus configured by the concave and convex fitting portions, it can be realized with a simple configuration similar to the overlapping portion.

The angle formed by the line segment in the radial direction of the cutter and the line segment from the sharp cutting edge of the shredding blade toward the groove bottom is θ1,
When the angle formed by the line segment in the radial direction of the cutter and the line segment in which the mating surface of the separator extends toward the outer peripheral side of the separator is θ2, the relationship of θ1> θ2 is preferably set. When set in this way, the shredded dust that has entered between the mating surfaces is likely to come out. Therefore, in the mating surface, the shredded dust is difficult to enter and easily comes out.

The distance between the separator side face and the separator guide groove formed smaller than the distance between the cutter and the cutter is
3-5% of the groove width of the separator guide groove or 0.03m
It is desirable that the thickness is set to m or more and 0.09 mm or less. When set in this way, not only is the gap between the separator side wall and the groove wall of the separator guide groove set to an appropriate value for preventing paper entrapment, but it is also necessary to prevent the adjacent separator and cutter from contacting each other. You can

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 portion formed on the uppermost part of the groove wall of the separator guide groove, or the center of the cutter shaft rather than the position of the step portion. It is desirable to be located on the side. With this configuration, the distance between the side surface of the separator and the groove wall of the separator guide groove can be reduced to more effectively set the paper wrapping prevention proper value.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. These figures show an embodiment in which the present invention is applied to a shredder equipped with an integrated cutter for shredding paper sheets such as paper and sheets (hereinafter abbreviated as paper). FIG. 1 is a vertical cross-sectional view of a charging port and a cutter unit. FIG. 2 is a vertical cross-sectional view of the inlet and the cutter unit in directions different by 90 degrees. Figure 3
[Fig. 3] is an enlarged view of a cutter unit. FIG. 4 is a front view showing the shape of the separator before being attached to the cutter shaft.
[Fig. 4] is a front view showing the shape of a separator after mounting.

The shredder according to this embodiment is shown in FIG.
As shown in FIG. 5, a cutter unit 10 for shredding a bundle of paper, an input port 20 for the bundle of paper, and the input port 20
A housing (exterior case) 30 that supports the housing, and a holding device 50 that detachably holds the insertion opening 20 with respect to the exterior case 30 are provided.

The insertion port 20 disposed above the cutter unit 10 has an upper opening 21 for receiving a bundle of paper.
And a lower opening 22 for discharging (falling) the bundle of paper 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 the minimum opening width B in consideration of safety. This input port 20
Is configured as a separate body from the outer case 30 that supports it.

As shown in FIGS. 1 and 2, the cutter unit 10 includes a pair of cutter shafts 1 and 1 arranged in parallel with each other so as to mesh with each other. Each cutter axis 1,
1, a plurality of cutters 11 are provided at intervals in the axial direction of the cutter shafts 1, 1. A separator S is arranged between each cutter 11. Each separator S is positioned between the cutters 11 by a plurality of separator guides 6.

In FIG. 3, the stack P of paper is a cutter unit 10.
It is the figure which expanded and showed the state shredded by. In this figure, a state is shown in which the sheet bundle P is drawn and is being cut by the tip of the shredding blade 11a of the cutter 11 on the right side of the figure. Below that is the left separator S
The state of the cutting waste P2 extruded on the peeling surface S1 is shown.

As shown in the figure, when a paper jam occurs when the rear end of the stack P of paper is located at a distance G'above the position of the minimum width B of the input port, it can be easily grasped and pulled out. If the rear end of the stack of paper P is G, it is difficult to grip it. In that case, an operation of reversing the cutter unit 10 is performed.

As shown in FIGS. 4 and 5, each separator S is provided with mating surfaces 12a, 12b having a space in the circumferential direction of the cutter shaft 1, and the mating surfaces 12a, 12b.
An entry preventing means 13 for preventing the shredded dust P1 from entering the center side of the cutter shaft 1 is provided between b. As will be described later, the invasion 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.

The separator S of the illustrated example is formed in a plate shape in which the whole is wound along the circumferential direction of the cutter shaft 1 by plastically deforming a part thereof. That is, as shown in FIG. 4, the thin hinge 14 that is plastically deformable is formed on the separator S. By configuring the separator S in this way, the separator S itself can be easily manufactured by punching a metal plate.

As a result, 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. Mating surface 12
The gap is formed between a and 12b because the mating surfaces 12a and 12b are separated by the elastic action (springback action) of the thin hinge portion 14 remaining after the plastic deformation.

As shown in FIG. 4, the guide hole 15 through which the cutter shaft 1 of the separator S penetrates is halved and has one side open. In FIG. 4, reference numeral 16 indicates a through hole of the separator guide 6.

The intrusion prevention means 13 for the shredded waste P1 has an overlapping portion w shown in FIG. 3, which is formed by the opposing mating surfaces 12a and 12b extending in the circumferential direction of the cutter shaft 1. When the overlapping portion w is provided, the mating surfaces 12a and 12b facing each other are curved, so that the shredder P1 does not easily enter the cutter shaft 1 side. That is,
The opposing mating surfaces 12 a and 12 b are configured to extend in the circumferential direction of the cutter shaft 1 and then extend in the radial direction of the cutter shaft 1. In this way, the opposing mating surfaces 12a,
The curved shape of 12b is due to the presence of the concave portion 13a and the convex portion 13b which are fitted to each other.

Therefore, the overlapping portion w of the entry preventing means 13 in the illustrated example is, in other words, the concave portion 13a provided on the mating surface 12a side and the concave portion 1 provided on the mating surface 12b side.
It is formed by a convex portion 13b fitted in 3a. The overlapping portion w of the ingress prevention means 13 is thus configured by the portion that is fitted in the concave and convex portions because the overlapping portion w can be realized with a simple configuration.

On the outer peripheral surface of the cutter 11, a plurality of chopping blades 11a having a groove for cutting the paper sheets P into strips are formed at intervals in the circumferential direction of the cutter 11. There is. The overlapping portion w is the shredding blade 11a.
It is formed so as to be located closer to the cutter shaft 1 than the groove bottom 11b. By providing the overlapping portion w of the facing mating surfaces 12a and 12b closer to the cutter shaft 1 than the groove bottom 11b of the shredding blade 11a, the function of the overlapping portion w can be more effectively exerted.

That is, the shredding blade 11a outside the groove bottom 11b
In the region (2), the action of drawing the shredded chips P1 by the sharp cutting edge is large. Therefore, the cutter shaft 1
By providing the overlapping portion w at the position closer to the side, it is possible to effectively suppress the action of pulling the shredder P1.

As shown in FIG. 1, the mating surface 12b which constitutes the invasion preventing means 13 together with the overlapping portion w is inclined to the forward rotation side of the cutter shaft 1 more than the radial line segment of the cutter shaft 1. At the same time, the following relationship is established between the shredding blade 11a and the shredder blade 11a.

The radial line segment of the cutter 11 and the shredding blade 1
The angle formed by the line segment from the sharp cutting edge of 1a toward the groove bottom 11b is θ1, the line segment in the radial direction of the cutter 11 and the line segment in which the mating surface 12b of the separator S extends toward the outer peripheral side of the separator S are formed. When the angle is θ2, θ1> θ
It is set to the relationship of 2. By setting in this way, the shredder P that has entered between the mating surfaces 12a and 12b.
1 becomes a form that is easy to slip out. Therefore, the mating surface 12
Between a and 12b, the shredded waste P1 is difficult to enter and can be easily removed.

In this respect, the mating surface 12a of the separator S,
When 12b is formed as shown in FIG.
As shown in FIG. 1 and the like, the shredded chips P1 are more likely to enter between the mating surfaces 12a and 12b and hard to come out than when the relationship of θ1> θ2 is set. This is the same as the reason explained in FIG. However, in the example shown in FIG. 6, since the concave portion 13a and the convex portion 13b fitted into the concave portion 13a are provided, this portion constitutes the entry preventing means 13. Therefore, also in this example, the effect of preventing the shredded chips P1 from entering can be obtained.

In FIG. 1, R1 is the outer radius of the cutter 11, R2 is the radius to the groove bottom of the shredding blade 11a, R
3 indicates a large radius portion of the separator overlapping portion w, and R4 indicates a small radius portion of the separator overlapping portion w.

7 and 8 are a longitudinal sectional view and a lateral sectional view for clearly showing the groove (spacing) between the cutters 11 and the separator guide groove 17. The separator guide groove 17 is
It is the groove closest to the center side of the cutter shaft 1, and the separator S is arranged between the separator guide grooves 17 with a highly accurate gap between the groove bottom and the groove wall.

As shown in FIG. 9A, the separator guide groove 17 formed to be smaller than the space between the cutters 11.
Where X is the groove width and Y is the thickness of the separator S, the interval δ1 = (X−Y) / 2 between the side surface of the separator S and the groove wall of the separator guide groove 17 is the groove width of the separator guide groove 17. 3 to 5% or 0.03 mm or more and 0.09 mm or less.

By setting in this way, the separator S
Between the side surface of the separator and the groove wall of the separator guide groove 17 δ
1 is not only set to the proper value for preventing paper entrapment,
It is possible to regulate so that the adjacent separators S and the cutter 11 do not come into contact with each other. Although these numerical values are obtained from the experimental results, the following reasons are generally considered.

When the paper stack P is excessively thrown during shredding,
After the cutter unit 10 is reversed to return the jammed paper stack P to the hand, the paper amount is reduced and the paper is re-input. Then, the tip portion that was previously shredded is cut again by the cutter to become finely shredded fine pieces P2, which has a problem of entering the above gap δ1. In this respect, such a problem can be positively prevented by adopting the numerical value obtained from the above experimental result. That is, in the relationship between the interval δ1 and the thickness t1 of the fine piece P2, at least the relationship of δ1 <t1 can be set, and the interval δ1 can be set to the paper entanglement prevention proper value.

Further, the depth of the separator guide groove 17 is from the step portions 17a on both sides to the groove bottom where the interval between the cutters 11, 11 becomes narrow near the groove bottom. The relationship with the height R5 of the separation surface (surface for separating the fine pieces) S1 of the separator S is also considered as follows. This consideration is based on the above gap δ1.
This is because it is possible to more effectively prevent the intrusion of the fine fragments P2 into. Here, R5 is a distance from the shaft center 1c of the cutter shaft 1 to the peeling surface S1 (distance in the radial direction of the cutter shaft 1).
Is shown.

That is, as shown in FIG. 9B, the separation surface S1 of the separator S is the step portion 17 of the separator guide groove 17.
9 is located on the groove bottom side by a step t2 from a.
As shown in (a), almost the same level is set. The form shown in FIG. 9 (b) is more preferable. Step t2
Is not particularly limited. However, the thickness between the guide hole 15 through which the cutter shaft 1 penetrates and the peeling surface S1 (the thin hinge portion 14
It is necessary to make sure that the wall thickness) does not become too thin.

In the embodiment, each separator S has a mating surface 12a, 1 having a space in the circumferential direction of the cutter shaft 1.
2b is formed, and between the mating surfaces 12a and 12b,
An ingress prevention means 13 is provided to prevent the shredded chips P1 and P2 from intruding in the direction of the cutter shaft 1 (in the direction of the bottom of the separator guide groove 17). Therefore, the shredded chips P1 and P2 pass through the gap between the mating surfaces 12a and 12b and the cutter shaft 1
Entry to the side is prevented. Thereby, the behavior of the shredded chips can be limited, and the shredded chips can be smoothly dropped. As a result, it is possible to improve the winding phenomenon of shredded waste, improve durability, and suppress noise.

[0046]

As described above, according to the shredder of the present invention, since the shredding means is provided between the mating surfaces formed on the separator, shredder debris is prevented from entering the cutter shaft side. It is possible to limit the behavior of scraps and smoothly drop the generated scraps into the scrap box. This improves the phenomenon of shredded dust winding, improves durability, suppresses noise,
Manufacturing costs can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a shredder according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the shredder according to the embodiment of the present invention.

FIG. 3 is an enlarged view of a cutter unit of the shredder according to the embodiment of the present invention.

FIG. 4 is a front view of the separator before being attached to 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 attached to 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 invention.

FIG. 7 is a vertical sectional view of a cutter unit of the shredder according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a cutter unit of the shredder according to the embodiment of the present invention.

FIG. 9 is an enlarged cross-sectional view of the essential parts 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 (integrated type).

FIG. 11 is a cross-sectional view showing a configuration of an existing cutter unit (single-leaf type).

FIG. 12 is a front view showing the configuration of an existing separator.

FIG. 13 is a front view showing the configuration of an existing separator.

FIG. 14 is a front view showing the configuration of an existing separator.

[Explanation of symbols]

1 cutter axis 2 cutter plate 4 separator 6 Separator guide 10 Cutter unit 11 cutter 11a Shredding blade 12a, 12b Mating surface 13 Entry preventive measures 13a recess 13b convex part 14 Thin hinge part 15 Guide hole 16 through holes 17 Separator guide groove 17a step 20 Input port 21 Upper opening 22 Lower opening 24 Inside 25 flange 30 outer case 50 holding device S separator S1 peeling surface P paper bundle P1 and P2 fine fragments

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shunichi Yokomine             9-5 Shinsencho, Shibuya-ku, Tokyo             -In the bus F-term (reference) 4D065 CA12 CB02 CC01 CC08 DD08                       DD22 EB12 EC07 EE19

Claims (8)

[Claims] 1. A cutter unit for shredding paper sheets by rotation, the cutter unit comprising cutter shafts arranged in parallel with each other, and a plurality of cutters provided at intervals in the axial direction of each cutter shaft. A shredder having a separator for separating shredded scraps from the cutter, wherein the separators are respectively arranged between the cutters, and each separator has a mating surface having a space in the circumferential direction of the cutter shaft. A shredder, which is formed between the mating surfaces and is provided with an ingress prevention means for preventing the shredded dust from intruding toward the center of the cutter shaft. 2. The shredder according to claim 1, wherein a part of the separator is plastically deformed to be formed into a plate shape which is wound around the cutter shaft in the circumferential direction. 3. The shredder according to claim 1, wherein the shredder intrusion preventing means has an overlapping portion that overlaps with each other by the opposing mating surfaces extending in the circumferential direction of the cutter shaft. 4. A plurality of shredded blades with grooves having sharp-edged cutting edges for cutting paper sheets into strips are formed on the outer peripheral surface of the cutter at intervals in the circumferential direction of the cutter. The shredder according to claim 3, wherein the overlapping portion is located closer to the center of the cutter shaft than the groove bottom of the shredding blade. 5. The shredder according to claim 1, wherein the means for preventing the intrusion of shredded waste includes a recess provided on one of the mating surfaces and a projection provided on the other and fitted into the recess. 6. The angle formed by the radial line segment of the cutter and the line segment extending from the sharp cutting edge of the shredding blade to the groove bottom is θ1, and the radial line segment of the cutter and the mating surface of the separator. The shredder according to claim 1, wherein when the angle formed by the line segment extending toward the outer peripheral side of the separator is θ2, the relationship of θ1> θ2 is set. 7. The distance between the side surface of the separator and the separator guide groove formed smaller than the distance between the cutters is 3 to 5% of the groove width of the separator guide groove or 0.03 mm or more and 0.09 mm or less. Is set,
The shredder according to claim 1. 8. The position of the peeling surface of the separator for peeling off the fine fragments is at the same level as the position of the step formed on the uppermost part of the groove wall of the separator guide groove, or from the position of the step. The shredder according to claim 7, wherein the shredder is also located on the center side of the cutter shaft.