JPH0357823B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a shredding method for shredding a sheet-like material to be shredded, such as paper, micro film, film for a projector, metal foil, etc., into minute pieces such as rectangular shapes. Regarding machines.

[Background of the Invention] First, a conventional example will be explained with reference to FIG. This shredding machine has a pair of rotating shafts 1 and 2 arranged in parallel, a plurality of disc-shaped blades 3 and 4 are attached to each rotating shaft 1 and 2 at equal intervals, and one blade 3 or 2 is arranged in parallel. The peripheral edge of the blade 4 or 3 was sandwiched between the peripheral edge of the other blade 4 or 3. 5 is a spacer, and the spacer 5 sets the interval between the blades 3 and 4. However, in this shredding machine, the material to be shredded (not shown) is fed between the rotating shafts 1 and 2, and the disc-shaped blades 3 and 4 work together to cut the material. The material could only be cut into longitudinal strips and could not be shredded into fine pieces. Therefore, with the recent development of computers, there is a possibility that confidential documents, drawings, etc. may be read. Furthermore, since it has two rotating shafts 1 and 2, it is structurally complex.

FIG. 8 is a sectional view showing another conventional example, in which a single blade 6 is provided with a blade part 7 for making horizontal cuts and a blade part 8 for making vertical cuts. A plurality of them are attached to the rotating shafts 9 and 10 of the book. 11
12 indicates the object to be shredded, and 12 indicates the fine pieces that have been shredded. However, since the shape of the blade 6 of this shredding machine is extremely complicated, processing accuracy must be increased, and therefore, the processing is difficult.

There is also a shredding machine (Jet Kaisho) in which a pair of rotary cutters makes longitudinal cuts in the material to be shredded, and then the other rotary cutters and a fixed blade cut it laterally into fine pieces. 52-5068), but this shredding machine had the disadvantages of being structurally complex and large in size. In addition, the positioning accuracy of the rotary cutter must be increased, resulting in the disadvantage that assembly is time-consuming.

[Purpose of the invention]

The present invention has been developed in view of the above circumstances, and it not only can reliably shred a sheet-like object into fine pieces, but also has a simple structure and a blade. The purpose is to provide a shredding machine that is easy to process and assemble.

[Summary of the invention]

The present invention is characterized in that the circumferential edge of the disc is cut off and a plurality of blade parts are provided radially protruding from the center of the disc, and the tips of the blade parts in the direction of travel are perpendicular to the direction of travel. an intermediate blade formed as a cutting edge for horizontal cross-cutting, and a disc having the same diameter as the disc with a peripheral edge cut off and having a plurality of blade parts corresponding to each blade part of the intermediate blade. The intermediate blade is held from both sides in a state where the intermediate blade is concentric and each blade part is continuous, and the cutting edge of the blade part for cross cutting is formed obliquely with one side face facing forward in the direction of travel, and the blade part A unit blade is constituted by a pair of side blades in which the tip of the side cutting edge is formed as a vertical cutting edge. a rotary blade fixed to the rotary blade; a fixed blade extending parallel to the rotation axis over the entire length of the rotary blade and close to the cross-cutting cutting edge; and a sheet-shaped object to be shredded between the rotary blade and the fixed blade. It consists of a feeder that is sent between the two.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to embodiments of the drawings. FIG. 1 is a side view showing a rotary blade of a shredding machine according to the present invention, FIG. 2 is a sectional view of the same shredding machine, and corresponds to a sectional view taken along the line - in FIG. 1, and FIG. 3 is the same. FIG. 4 shows an enlarged perspective view of the main part of the rotary blade, and a side view of the intermediate blade. The shredding machine according to the present invention includes a rotary blade 15 in which a plurality of unit blades 13, 13, .
5, and a feeder 18 that feeds a sheet-shaped object 17 between the rotary blade 15 and the fixed blade 16.

The unit blades 13, 13, .
It is constructed by sandwiching it from both sides at 21 and integrating the whole. The intermediate blade 19 is formed by cutting off the peripheral edge of a disc, and has a plurality of blade parts 22 protruding radially from the center of the disc. Furthermore, the blade portion 22
The leading end in the direction of travel is formed as a cutting edge 23 for transverse cutting that is perpendicular to the direction of travel and has an acute angle. Cross cutting edge 23 of one blade part 22
is the adjacent blade portion 22 and rake face 37 in the forward direction of travel.
and are connected by a connecting surface 38. The side blade 20 has a protruding blade portion 24 corresponding to each blade portion 22 of the intermediate blade 19 by cutting a circular edge portion of a disk having the same diameter as the aforementioned disk. The cutting edge 25 for cross-cutting is aligned with the intermediate cutting edge 1 in the direction of movement.
The side opposite to the 9 side is formed obliquely, that is, one side face is the front side. Furthermore, the tip of the cutting edge 25 for horizontal cutting on the side surface of the blade portion 24 is formed as a cutting edge 26 for vertical cutting with an acute angle. The side blade 20 also has a rake surface 39 and a continuous surface 40 corresponding to the rake surface 37 and the continuous surface 38 of the intermediate blade 19.
is formed. The other side blade 21 is
Formed in a plane symmetrical structure with the side blade 20, a blade portion 27, a cutting edge 28 for horizontal cutting, a cutting edge 29 for vertical cutting,
A rake face 41 and a continuous face 42 are provided.
A pair of side blades 20, 21 sandwich the intermediate blade 19 from both sides in a state in which the intermediate blade 19 is concentric and the respective blade portions 22, 24, 27 are continuous, that is, the respective cross-cutting cutting edges 23, 25, 28 are continuous. Incidentally, the number of intermediate blades 19 constituting the unit blade 13 is not limited to three, and it goes without saying that the number may be three or less or three or more.

The rotary blade 15 includes a plurality of unit blades 1.
3, 13, . . . are fixed to the rotating shaft 14 in such a manner that the cutting edges 23, 25, 28 for cross-cutting of each unit blade 13 are arranged so as to be offset from each other in the circumferential direction. Because of this offset structure, the vertical cutting edges 26 and 29 do not overlap with each other, so the acute angle does not decrease, and therefore, the cutting ability can be maintained at a high level. The rotating shaft 14 is rotatably supported by a bearing 30 and is connected to a rotational drive source (not shown). The rotary blade 15 has an intermediate blade 19 and side blades 20, 21, which are formed using a disk of the same diameter as a base, attached to the rotary shaft 14 in a concentric state, so that each blade part 22, 24, 27 The outer peripheral surface of is formed along the cylindrical surface 31.

The fixed blade 16 extends parallel to the rotating shaft 14 over the entire length of the rotary blade 15, and is provided close to the cross-cutting cutting edges 23, 25, and 28. The cutting edge 32 of the fixed blade 16 and the blade portions 22, 2
The gap δ between the outer circumferential surfaces of the blades 4 and 27 is set smaller than the thickness of the sheet-shaped object 17 to be shredded, so that when the object 17 is introduced between the rotary blade 15 and the fixed blade 16, Designed to ensure reliable cutting.
Since the thickness of the thin object 17 differs depending on the type, the fixed blade 16 as a whole is configured so that it can be finely adjusted to move toward and away from the rotary blade 15.

The feeder 18 includes a pair of friction rollers 33,
34, one of these friction rollers 33, 34 is connected to the rotating shaft 14 via a pulley 35 and a belt 36. The feeding speed of the object 17 to be shredded by the feeder 18 may be configured to be variable by a speed change mechanism (not shown).

Next, the operation of the present invention will be explained. The material to be shredded 17 is fed by a feeder 18 toward the rotary blade 15 at a constant speed. The tip of the object to be shredded 17 slightly protrudes from the cutting edge 32 of the fixed blade 16, and the vertical cutting edges 26 and 29 of the rotating rotary blade 15 cut the object to be shredded into thin pieces in the vertical direction while maintaining its stiffness. Immediately after cutting, the cutting edges 23, 25, and 28 for cross-cutting shred the object 17 in the transverse direction to shred the object 17 into fine pieces 43.

FIG. 5 is a side view showing a rotary blade of a shredding machine having a structure in which the intermediate blade 19 is removed from the components of the shredding machine of the present invention described above, and FIG. 6 is an enlarged perspective view of the main parts of the rotary blade. shows. Except for the absence of the intermediate blade 19, the other configurations are the same as those of the above-mentioned shredding machine, so the same parts are given the same reference numerals and a description of the configuration will be omitted. In the case of this shredding machine, since there is no intermediate blade 19, it is possible to shred into narrower pieces, but overall the total length of the vertical cutting edges 26 and 29 is longer than that of the above shredding machine. The length increases, and therefore the cutting resistance increases. In addition, since each unit blade 13 is entirely composed of the pair of side blades 20 and 21, compared to the case where an intermediate blade 19 without a vertical cutting edge is interposed as in the above-mentioned shredding machine, this The number of required machining operations for the cutting edge for vertical cutting increases, and the machining process is time-consuming. In other respects, the operation and effect are the same as the above-mentioned shredding machine.

[Effects of the Invention] According to the present invention, each unit blade is fixed to the rotating shaft with the cutting edge for cross-cutting shifted in the circumferential direction, and the cutting edge for cross-cutting is formed laterally perpendicular to the direction of movement, and the intermediate blade Since the unit blade was constructed by holding the blade between a pair of side blades having a cutting edge for transverse cutting obliquely to the direction of travel and a cutting edge for vertical cutting provided on the side surface of the tip, the blade was first cut vertically using the offset structure. The sharp angle of the cutting edge is maintained high, which ensures vertical shredding, and the cross-cutting cutting edge and fixed blade ensure horizontal shredding, which overall reduces the shredded material. It can be reliably shredded into fine pieces. In addition, if the feeding speed of the object to be shredded by the feeder is set so that the tip of the object to be shredded comes into contact with the continuous surface before the vertical cutting starts, the tip of the object will be slightly bent. Since cutting is performed in the longitudinal direction, many pieces can be cut at once, increasing the efficiency of shredding in the fine direction. In addition, the offset structure prevents each blade edge from starting to cut the object to be shredded at the same time, and allows the cutting edges to start cutting with slight deviations from each other, thereby reducing the cutting resistance as a whole.

In addition, since each unit blade is fixed to one rotating shaft, the structure is simple, and each unit blade also has an intermediate blade that has only a cutting edge for cross cutting, a cutting edge for vertical cutting, and a cutting edge for cross cutting. Since it is configured in combination with a pair of side blades, it is easy to process and assemble.

[Brief explanation of drawings]

FIG. 1 is a side view showing a rotary blade of a shredding machine according to the present invention, and FIG.
This corresponds to a sectional view taken along the line, and Fig. 3 is an enlarged perspective view of the main parts of the rotary blade, Fig. 4 is a side view of the intermediate blade, and Fig. 5 is a side view of the intermediate blade.
The figure is a side view showing a rotary blade of a shredding machine having a structure in which the intermediate blade is removed from the components of the shredding machine of the present invention, FIG. 6 is an enlarged perspective view of the main part of the rotary blade, and FIG. 7 is a conventional example. FIG. 8 is a sectional view of the main part showing a different conventional example. 13... Unit blade, 14... Rotating shaft, 15...
...rotating blade, 16...fixed blade, 17...material to be shredded,
18...Feeder, 19...Intermediate blade, 20, 21
...Side blade, 22, 24, 27...Blade part, 2
3, 25, 28...Cross cutting edge, 26, 29...
...Blade tip for vertical cutting.

Claims (1)

[Claims] 1 The peripheral edge of the disc is cut out and a plurality of blade parts are protruded radially from the center of the disc, and the tip of the blade part in the direction of travel is a horizontal crosscutting that is perpendicular to the direction of travel. an intermediate blade formed as a cutting edge; and a disc having the same diameter as the disc, the peripheral edge of which is cut off and having a plurality of blade parts corresponding to each blade part of the intermediate blade. The blades are held concentrically and connected from both sides, and the cutting edges of the blades are formed obliquely with one side facing forward with respect to the direction of travel. A unit blade is constituted by a pair of side blades, the tips of which are formed as vertical cutting edges, and a plurality of unit blades are fixed to a rotating shaft with the horizontal cutting edges offset from each other in the circumferential direction. a rotary blade, a fixed blade that extends along the entire length of the rotary blade parallel to the rotation axis and is close to the cross-cutting cutting edge, and a feeder that feeds a sheet-like material to be shredded between the rotary blade and the fixed blade. A shredding machine characterized by comprising: