JPH0640972B2 - Sheet-shaped object cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a device for cutting a sheet-like object such as paper, a synthetic resin sheet, or a cloth into elongated strips.

[Conventional technology]

Conventionally, for example, in order to make it easier to read unnecessary confidential documents and the like, by passing them between two rotating cutting blade rolls as shown in FIG.
A so-called "shredder" or the like is often used as a device for cutting into pieces of about 5 mm width. In this case, the positional relationship between the two cutting blade rolls is such that the disc-shaped projecting portions (cutting members) formed on the outer peripheral portion so as to project on the respective cutting blade rolls are between the projecting portions of the other cutting blade roll. By rotating the tip portion into the intervening state, the sheet-like object which is the object to be cut is sequentially fed and cut into pieces.

[Problems of conventional technology]

However, as described above, the cutting blade roll provided with the disk-shaped protruding portion forming the blade and the annular groove is generally made of steel, so that the cutting blade is easily worn and easily rusted. For a short period of time, the cutting characteristics deteriorate, and as the sharpness decreases, noise is generated during cutting and a large amount of power is consumed.

[Means for solving problems]

In view of the above, it is characterized in that the blade of the cutting blade roll that constitutes the cutting device for cutting the sheet-like object is made of a ceramic material such as alumina or zirconia having corrosion resistance and wear resistance.

〔Example〕

 Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a plan view in which the cutting device is combined with the cutting blade rolls 1 and 1 in a mounted state. In this cutting blade roll 1, a plurality of ceramic discs 2 each having a blade formed on a ridge portion are provided with a rotating shaft 3
It is mounted so as to rotate integrally with the
As shown in the enlarged partial view of the portion A in the figure, the assembly is used so that the ceramic discs 2 of the opposing cutting blade roll 1 are alternately meshed with each other. The cutting blade roll 1 used in this way is provided with a fixed flange 3a at one end of a metallic rotary shaft 3 as shown in the three-dimensional exploded view of FIG. The ceramic disc 2 is inserted. In this case, between the ceramic disc 2 and the adjacent ceramic disc 2 where the other ceramic disc 2 meshes with each other, a ceramic plate, a metal plate, a plastic plate or the like having a diameter smaller than that of the ceramic disc 2 and a thin wall is formed. The spacer ring 4 may be interposed if necessary, but instead of the spacer ring 4, it is not connected to the rotary shaft 3, that is, regardless of the rotation of the rotary shaft 3, and the guide portion 5a is integrally formed on the upper portion. By disposing the formed guide members 5 between the ceramic discs 2, respectively, a plurality of these guide members 5 are aligned and a cut object such as paper which is thrown in from above is successfully supplied to the cutting operation unit. I can guide you. The ceramic disc 2 which is such a blade member is formed with a rotation stopper 2b in the insertion hole 2a of the rotary shaft 3 opened at the center so as to rotate together with the rotary shaft 3,
Alternatively, the cross-sectional shape of the rotary shaft 3 at the portion where the ceramic disc 2 is inserted is made rectangular or elliptical, and the insertion hole 2a suitable for this is formed in the ceramic disc 2 so that the ceramic disc 2 can be inserted. The plate 2 can be freely moved in the axial direction of the rotary shaft 3. As a result, the cutting blade rolls 1 can be easily assembled in a state where they are alternately meshed with the respective ceramic discs 2.

The blade angle of the blade 2c formed on the outer peripheral edge portion of the ceramic disk 2 shown in FIG. 2 is about 90 degrees or slightly smaller than 70 degrees, and has such a blade angle. When the blades are combined as shown in FIG. 2, the sheet-like object S such as paper shown by the dotted line in the figure is cut into shreds.

It should be noted that the cutting frequency is greatest in the substantially central part of the cutting blade roll, and therefore the cutting characteristics deteriorate with long-term use. In such a case, however, it is likely that the ceramic disc 2 will be chipped. In case of ceramic plate 2
Only the one can be easily replaced with a new one and repaired.

By the way, as a material for forming the ceramic disk 2 having the blade as described above, a suitable material is a ceramic material such as alumina, zirconia, silicon carbide or silicon nitride, which has high hardness, high wear resistance, and high corrosion resistance. Especially, zirconia ceramic is suitable because of its high toughness.

〔The invention's effect〕

As described above, according to the present invention, the opposing ceramic discs of the cutting blade roll comprising a plurality of ceramic discs formed with blades are adapted to rotate in mesh with each other. In particular, the cutting edge does not rust or corrode,
Moreover, due to its high wear resistance, the cutting characteristics do not deteriorate over an extremely long period of time as compared with the conventional blade made of steel, resulting in not only a long life but also noise during cutting. In addition to the feature that it is small, even if some blade spills etc., remove the tightening nut,
By exchanging only the defective ceramic disk, it is possible to provide an excellent sheet-shaped object cutting device that can always maintain good cutting characteristics.

[Brief description of drawings]

FIG. 1 is a plan view in which cutting blade rolls constituting the device of the present invention are combined in a mounted state, FIG. 2 is an enlarged view of part A in FIG. 1, and FIG. 3 is a cutting blade roll shown in FIG. FIG. 4 is a three-dimensional exploded view of FIG. 1, and FIG. S: Sheet-like object 1: Cutting edge roll 2: Ceramic disc 3: Rotating shaft

Claims (1)

[Claims] 1. A pair of cutting blade rolls, each of which has a rotary shaft inserted through it to be rotationally driven by a plurality of ceramic discs each having a blade formed on the outer periphery and a through hole formed in the central portion thereof. A device for cutting a sheet-like object, characterized in that it is arranged so as to alternately mesh with each other of the ceramic discs of the other side inserted through, and is cut by the rotation of the ceramic discs accompanying the rotation drive of the rotary shaft.