JPS60244352A - Shredder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, a microfilm, a film for a profilometer, a metal foil, etc., into fine 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 is
A pair of rotating shafts 1 and 2 are arranged in parallel, and a plurality of disc-shaped blades 3.4 are attached to each rotating shaft 1.2 at equal intervals, and the peripheral edge of one of the blades 3 or 4 is other blade 4 or 3
It was configured so that it was sandwiched around the periphery of the 5 is a spacer, and the spacer 5 sets the interval between the blades 3 and 4. However, this shredding machine feeds the object to be shredded (not shown) between the rotating shafts 1 and 2 and cuts it by the cooperation of the disc-shaped blades 3 and 4. 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 drawings in secret documents may be read.

However, it was structurally complex because it had two rotating shafts 1.2.

FIG. 8 is a sectional view showing another conventional example, in which a blade part 7 makes a horizontal cut on a single blade 6 and a blade part 8 makes a vertical cut.
A plurality of blades 6, 6 are attached to two rotating shafts 9, 10. Reference numeral 11 indicates an object to be shredded, and 12 indicates a fine piece that has 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.

In addition, a shredding machine that makes vertical cuts in the material to be shredded using a pair of rotary cutters, and then cuts it horizontally into fine pieces using another rotary cutter and a fixed blade.
However, this shredding machine has the drawbacks of being structurally complex and large in size. Furthermore, the positioning accuracy of the rotary cutter must be increased, and there is a drawback that assembly is time-consuming.

[Purpose of the invention]

The present invention has been developed in view of the above circumstances, and it is possible to reliably shred a sheet-like object to be shredded into fine pieces. 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 peripheral edge of the disc is cut out, and a plurality of blade parts are provided radially protruding from the center of the disc, and the leading edge of the blade part in the traveling direction is an intermediate blade formed as a perpendicular horizontal cutting edge for cross-cutting, and a plurality of blade parts that are disks with the same diameter as the disk and have their peripheral edges cut out and correspond to each blade part of the intermediate blade. The intermediate blade is held on both sides with the same window and each blade being one slow, and the cutting edge of the blade for transverse cutting is formed diagonally with respect to the direction of travel with one side facing forward. and a pair of side blades in which the tip of the cutting edge for horizontal cutting on the side surface of the blade part is formed as a cutting edge for vertical cutting. A rotary blade fixed to a rotating shaft in a position offset from each other in the circumferential direction, a fixed blade extending parallel to the rotating shaft over the entire length of the rotating blade and close to the cutting edge for transverse cutting, and a sheet-like cover. It is composed of a feeder that feeds the shredded material between the rotary blade and the fixed blade.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings. FIG. 1 is a side view showing a rotary blade of a shredding machine according to the present invention, and FIG.
The figure is a cross-sectional view of the same shredding machine, and corresponds to the cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is an enlarged perspective view of the main parts of the rotary blade, and Figure 4 is a side view of the intermediate blade. show. The shredding machine according to the present invention includes a plurality of unit blades 13, 13 . A rotary blade 15 fixed to the rotary shaft 14, a fixed blade 16 provided parallel to the rotary shaft 14 and close to the rotary blade tool 5, and a sheet-shaped cover. The shredded material 17 is cut between the rotary blade 15 and the fixed blade 16.
and a feeder 18 for feeding between the two.

The unit blades 13, 13. . . . is a stack of three intermediate blades 19 and a pair of side blades 20°2.
It is constructed by sandwiching both sides together in 1 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. Further, the tip of the blade portion 22 in the direction of travel is a cutting edge 23 for transverse use, which is perpendicular to the direction of travel and has an acute angle.
It is being formed as The cutting edge 23 for cross-cutting of one blade portion 22 has a rake surface 37 with the adjacent blade portion 22 in the forward direction of movement.
and multiple connections to the connecting surface 38. The side blade 20 is formed by cutting off a circular edge of a disk having the same diameter as the disk, and has a protruding blade portion 24 corresponding to each blade portion 22 of the intermediate blade 19. The cutting edge 25 for cross-cutting of the blade portion 24 is formed obliquely on the side opposite to the intermediate blade 19 side with respect to the traveling direction, that is, one side face side is the front side. Further, the tip of the cutting edge 25 for transverse cutting on the side surface of the blade 1 portion 24 is formed with a rake surface 39 and a continuous surface 40 corresponding to vertical cutting with an acute angle. The other side blade 21 is formed to have a plane-symmetric structure with the side blade 20, and is provided with a blade portion 27, a cutting edge 28 for horizontal cutting, a cutting edge 29 for vertical cutting, a rake surface 41, and a continuous surface 42. ing. The pair of side blades 20.21 hold the intermediate blade 19 on both sides in a state in which the blade portions 22, 24, and 27 are in series, that is, in a state in which the cutting edges 23, 25, and 28 for transverse cutting are in series. There is. Similarly, 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 13° 13
, . . . is fixed to the rotating shaft 14 in such a manner that the cutting edges '23, 25, 28 for transverse cutting of each unit blade 13 are offset from each other in the circumferential direction. Due to the structure, the cutting edges 26 and 29 for each vertical cut are not adjacent to each other, so
The acute angle does not decrease, and therefore the cutting ability can be maintained high. 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 a side blade 20.21, which are formed using a disk of the same diameter as a base, and are attached to the rotary shaft 14 in a state of comrade.
．． The outer peripheral surfaces of 24 and 27 are 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 has cutting edges 23, 2 for transverse cutting.
5.28. The gap δ between the cutting edge 32 of the fixed blade 16 and the outer peripheral surface of the blade portions 22 and 24° 27 is set to be smaller than the thickness of the sheet-shaped object 17, so that the rotary blade 15 and the fixed blade 16 and the object to be shredded 1
7 is configured so that it can be reliably cut when it is introduced. 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 is composed of a pair of friction rollers 33 and 34, and one of the friction rollers 33 and 34 is connected to the rotating shaft 14 via a pulley 35 and a belt 36.
is connected to. The feeding speed of the material to be shredded 17 by the feeder 18 may be configured to be variable by a speed change mechanism (not shown).

Next, the present invention will be explained in detail. The object to be shredded 17 is fed by a feeder 18 at a constant speed toward the rotary blade 15. The vertical cutting edges 26, . Immediately after 29 shreds the object 17 in the longitudinal direction, the cutting edges 23, 25 and 28 for crosscutting cut 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 #l cutting machine of the present invention described above, and Fig. 6 is an enlarged perspective view of the main part of the rotary blade. Show the diagram. 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 fine pieces, but overall the total length of the vertical cutting edge 26.29 is smaller than that of the above shredding machine. The longer it is, the greater the cutting resistance will be.

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 shredding machine. Therefore, the number of machining operations required for the vertical cutting edge increases, and the machining process is time-consuming. In other respects, the operation and effect are the same as the above-mentioned shredding machine.

〔Effect of the invention〕

According to the present invention, each unit blade is fixed to the rotating shaft with the cutting edge for transverse cutting shifted in the circumferential direction, and the cutting edge for transverse cutting is formed horizontally perpendicular to the direction of movement, and the intermediate blade is First, the unit blade is constructed by being held between a pair of side blades having a cutting edge for transverse cutting obliquely to the direction of movement and a cutting edge for vertical cutting provided on the side surface of the tip. Due to the offset structure, the acute angle of the vertical cutting blade edge is maintained at a high level, and thereby, vertical cutting is reliably performed,
Further, the horizontal cutting edge and the fixed blade reliably perform the shredding in the lateral direction, and as a whole, the object to be shredded can be reliably shredded into fine pieces. Similarly, if the speed at which the feeder feeds the object to be shredded is set so that the tip of the object to be shredded contacts the continuous surface before the vertical cutting starts, the tip will be slightly bent. Since cutting is performed in the longitudinal direction in this state, many pieces can be cut at once, and the efficiency of shredding in the group direction can be increased. 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 horizontal cutting. Since it is configured in combination with a pair of side blades having cutting edges for cutting, processing and assembly are easy.

[Brief explanation of 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. is an enlarged perspective view of the main parts of the rotary blade, No. 4
1. The figure is a side view of the intermediate blade, and FIG. FIG. 6 is an enlarged perspective view of the main part of the rotary blade, FIG. 7 is a front view of the main part showing a conventional example, and 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...Object to be shredded, 18...Feeder, 19...Intermediate blade, 20
．． 21...Side blade, 22; 24,27...Blade portion, 23°25.28...Cross cutting edge, 26,2
9...Blade tip for vertical cutting. Agent Tatsuyuki Unuma (and 1 other person) Figure 5 15 Figure 7

Claims (1)

[Claims] The circumferential edge of the disc is cut out to have a plurality of blades protruding radially from the center of the disc, and the tips of the blades in the direction of travel are transversely perpendicular to the direction of travel. ); and a disc having the same diameter as the disc, the peripheral edge of which is cut off, and a plurality of blade parts corresponding to each blade part of the intermediate blade. The cutting edge of the cutting edge is formed obliquely with respect to the direction of movement with one side facing forward, and the cutting edge of the cutting edge is formed diagonally with respect to the direction of travel, and the side surface of the cutting edge is and a pair of side blades, the tip of which is formed as a vertical cutting edge. A rotary blade fixed to a rotating shaft in an arrangement, a fixed blade extending over the entire length of the rotary blade parallel to the rotating shaft and close to the cutting edge for cross-cutting, and a sheet-like object to be shredded by the rotating blade. A shredding machine characterized by comprising a feeder feeding between a blade and a fixed blade.