JPS6260240B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method for shredding sheet-like materials such as paper, microfilm, film for projectors, metal foil, etc. into fine rectangular pieces. Regarding disconnection.

[Prior art and its problems] 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. 2 is a cross-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. 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.

The present invention has been made in view of the above circumstances, and is capable of reliably shredding a sheet-like object to be shredded into fine pieces, has a simple structure, and is capable of processing and assembling the blade. It is an object of the present invention to provide a shredding machine which is simple, has less wear on its blades, and can easily resharpen its blades.

[Means for Solving the Problems] The present invention is characterized in that the circumferential edge of a disc is cut out and a plurality of blade parts are provided radially protruding from the center of the disc, and the blade parts move forward. The directional tip is formed as a cutting edge for cross-cutting which is formed obliquely with one side facing forward with respect to the traveling direction, and the front surface of the cutting portion in the traveling direction is formed as a concave rake face, thereby achieving the cutting edge for cross-cutting. A pair of unit blades each having a side tip connected to the tip formed as a vertical cutting edge having a substantially U-shape are joined to each other so that the side cutting edge forms a V-shaped blade to form a unit blade, A rotary blade in which a plurality of unit blades are fixed to a rotary shaft with cutting edges for cross-cutting arranged so as to be offset from each other in the circumferential direction; The rotary blade is composed of a fixed blade, and a feeder that feeds the sheet-shaped material to be shredded between the rotary blade and the fixed blade.

[Operation] The material to be shredded is sent toward the rotary blade by the feeder. With the tip of the object to be shredded slightly protruding from the cutting edge of the fixed blade to maintain its stiffness, the vertical cutting edge of the rotating rotary blade shreds the object in the longitudinal direction. At this time, since the blade parts of each unit blade are arranged circumferentially offset from each other, the vertical cutting edges of all unit blades do not start shredding at the same time, but perform staggered shredding. The shredding resistance is small. Immediately after the vertical cutting edge of the unit blade shreds the material to be shredded in the vertical direction, the horizontal cutting edge of the unit blade (a pair of V-shaped blades) shreds the material in the horizontal direction. Shred the cut material into fine pieces.

[Embodiment] An embodiment of the shredding machine according to the present invention will be described based on FIGS. 3 to 5.

The shredding machine according to the present invention includes a plurality of unit blades 2
Rotary blade 1 with 7, 27,... fixed to the rotating shaft 11
8, a fixed blade 19 provided parallel to the rotating shaft 11 and close to the rotating blade 18, and a feeder 24 for feeding a sheet-shaped object to be shredded between the rotating blade 18 and the fixed blade 19. It consists of

The unit blades 27, 27, . . . are constructed by joining and integrating a pair of unit blades 13, 13, . This unit blade 13 has a circular plate whose peripheral edge is cut off and a plurality of blade parts 14 projecting radially from the center of the circular plate. Furthermore, the blade portion 1
4 is formed as a cutting edge 15 for cross-cutting which is formed obliquely with one side surface 17 facing forward with respect to the direction of travel. One blade part 14
The cutting edge 15 for cross-cutting is formed in series with the adjacent blade portion 14 on the forward side in the advancing direction, a concave rake surface 21, and a continuous surface 29. By forming this rake surface 21, the side surface 17 of the blade portion 14 has a cross-cutting cutting edge 1.
5 is formed as a substantially U-shaped vertical cutting edge 30. Said one unit blade 1
Another unit blade 13, which is joined with the unit blade 3 to form the unit blade 27, is formed to have a plane-symmetrical structure with the unit blade 13, and the side surfaces 16 of both unit blades 13 are joined to form a cross-cutting cutting edge 15. A pair of V-shaped blades 3
3 is formed.

The rotary blade 18 includes a plurality of unit blades 2.
7, 27,... are the V-shaped blades 3 of each unit blade 27.
A pair of cross-cutting cutting edges 15 forming a 3-shape are fixed to the rotating shaft 11 in such a manner that the adjacent cutting edges 15 are shifted from each other in the circumferential direction. Because of this offset structure, the vertical cutting edges 30 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 11 is rotatably supported by a bearing 12 and is connected to a rotational drive source (not shown). The rotary blade 18 has a unit blade 13 formed using a circle of the same diameter as a base, and a rotary shaft 11 in a concentric state.
Since the blade portion 14 is attached to a cylindrical surface 31, the outer circumferential surface 20 of each blade portion 14 is formed along a cylindrical surface 31.

The fixed blade 19 extends parallel to the rotating shaft 11 over the entire length of the rotary blade 18, and is provided close to the cross-cutting cutting edge 15. The gap δ between the cutting edge 32 of the fixed blade 19 and the outer circumferential surface 20 of the blade portion 14 is set smaller than the thickness of the sheet-shaped object 28 to be shredded, so that there is no space between the rotary blade 18 and the fixed blade 19. The structure is such that the object to be shredded 28 is reliably cut when introduced. Since the thickness of the thin object 28 differs depending on the type, the fixed blade 19 as a whole is configured to be able to be finely adjusted to move toward and away from the rotary blade 18.

The feeder 24 includes a pair of friction rollers 22,
One of these friction rollers 22 and 23 is connected to the rotating shaft 11 via a pulley 25 and a belt 26. The feeding speed of the material to be shredded 28 of the feeder 24 may be configured to be variable by a transmission machine (not shown).

As explained above, in the shredding machine according to the present invention, the peripheral edge of the disc is cut out and a plurality of blade parts 14 are provided radially protruding from the center of the disc, and
The tip of the cutting edge 14 in the direction of movement is formed as a cutting edge 15 for cross-cutting which is formed obliquely with one side face facing forward in the direction of movement, and the blade part 14
A pair of unit blades 13 are formed by forming a concave rake face 21 on the front side in the advancing direction, so that the tip of the side surface 17 connected to the tip of the cross cutting blade 15 is formed as a vertical cutting blade 30 having a substantially U-shape. The side surfaces 16 are joined together so that the cutting edge 15 for cross-cutting forms a V-shaped blade 33 to form a unit blade 27,
A rotary blade 18 has a plurality of unit blades 27 whose cutting edges 15 are fixed to the rotary shaft 11 so as to be offset from each other in the circumferential direction. Cutting edge 1
5, and a feeder 24 that feeds a sheet-shaped object to be shredded between the rotary blade 18 and the fixed blade 19.

Next, the effect will be explained. The object to be shredded 28 is sent toward the fixed blade 18 by the feeder 24 . In a state where the tip of the object to be shredded 28 slightly protrudes beyond the cutting edge 32 of the fixed blade 19 and its stiffness is maintained, the vertical cutting edge 30 of the rotating rotary blade 18 cuts the object to be shredded 28 in the vertical direction. cut off At this time, since the blade portions 14 of each unit blade 27 are arranged circumferentially offset from each other, the vertical cutting edges 30 of all unit blades 27 do not start shredding at the same time, but perform staggered shredding. , the shredding resistance during vertical cutting is small. Immediately after the vertical cutting edge 30 of the unit blade 27 shreds the object 28 in the vertical direction, the horizontal cutting edge 15 (a pair of V-shaped blades 33) of the unit blade 27 cuts the object 28 in the horizontal direction. The object to be shredded 28 is shredded into fine pieces. 34 indicates finely chopped pieces.

[Effects of the Invention] According to the present invention, each unit blade is fixed to the rotating shaft with the cutting edge for transverse cutting disposed at a position shifted in the circumferential direction, and the cutting edge for transverse cutting is provided obliquely to the direction of travel and the side surface of the tip thereof. Since the unit blade is configured such that the pair of cross cutting blades form a V-shape with a pair of vertical cutting blades, the acute angle of the vertical cutting blade is maintained at a high level due to the offset structure. This ensures that the material is shredded in the vertical direction, and the cross cutting edge and the fixed blade ensure that the material is shredded in the horizontal direction, thereby ensuring that the object to be shredded as a whole is shredded into fine pieces. be able to.
Furthermore, 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.

Further, since the outer peripheral surface of the blade portion is formed along the same cylindrical surface, re-polishing is easy.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional shredding machine, Fig. 2 is a sectional view showing another conventional example, Fig. 3 is a sectional view showing an embodiment of the shredding machine according to the present invention, and Fig. 4 5 is a front view showing the rotary blade in the same embodiment, and FIG. 5 is a perspective view of the main part showing the blade part in the same embodiment. 11...Rotating shaft, 13...Unit blade, 14...Blade portion, 1
5... Cutting edge for cross cutting, 16, 17... Side face, 18... Rotating blade, 19... Fixed blade, 20... Outer circumferential surface, 21... Rake face, 24... Feeder, 27... Unit blade, 28
...Object to be shredded, 30...Blade tip for vertical cutting.

Claims (1)

[Claims] 1 The circumferential 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 direction of travel is such that one side face is in the direction of travel. The blade is formed as a diagonally formed cutting edge for cross-cutting, and by forming the front side of the blade portion in the direction of travel as a concave rake face, the side tip that continues to the tip of the cutting edge for cross-cutting has a substantially U-shaped vertical shape. A unit blade is formed by joining a pair of unit blades formed as a cutting edge side to side so that the side cutting edge forms a V-shaped blade,
A rotary blade in which a plurality of unit blades are fixed to a rotary shaft with cutting edges for cross-cutting arranged so as to be offset from each other in the circumferential direction; 1. A shredding machine comprising: a fixed blade; and a feeder that feeds a sheet-like object to be shredded between the rotary blade and the fixed blade.