JPS6249954A - Cutter for sheet-shaped body - 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 Industrial Application] The present invention relates to an apparatus for cutting sheet-like objects such as paper, synthetic resin sheets, cloth, etc. into long and thin strips.

[Conventional technology]

Conventionally, in order to make confidential documents that are no longer needed easily readable, they are passed between two rotating cutting blade rolls as shown in Figure 4.
A so-called "shredder" is often used as a device for cutting into strips having a width of about 5 to 50 mm. In this case, the positional relationship between the two cutting blade rolls is such that the disc-shaped protrusions (cutting members) formed on the outer periphery of each cutting blade roll are between the protruding parts of the other cutting blade roll. By rotating with the tip end intervening, the sheet-like object to be cut is sequentially fed and cut into strips.

[Problems with conventional technology]

However, as mentioned above, cutting blade rolls with disc-shaped protrusions forming blades and annular grooves are generally made of steel, which causes the cutting blades to wear easily and rust easily. After a short period of use, the cutting characteristics deteriorate, and as the cutting quality deteriorates, the blade generates noise during cutting and consumes a large amount of power.

[Means for solving problems]

In view of the above, the present invention is characterized in that the blades of the cutting blade roll constituting the cutting device for cutting a sheet-like object are made of a ceramic material such as alumina or zirconia that has corrosion resistance and wear resistance.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described in detail with reference to the drawings.

FIG. 1 shows a plan view of a cutting device in which cutting blade rolls 1.1 are assembled in a mounted state.
It is mounted so that it is rotated integrally with the
As shown in the enlarged partial view of part A in the figure, it is assembled and used so as to alternately mesh with the ceramic disks 2 of the opposing partner cutting blade roll 1. The cutting blade roll l used in this way has a fixed flange 3a provided at one end of a metal rotary shaft 3, as shown in the three-dimensional exploded view of FIG. Ceramic disk 2 is inserted. In this case, the ceramic disc 2 and the other ceramic disc 2 mesh with each other.
A spacer ring 4 made of a ceramic plate, a metal plate, a plastic plate, etc. having a diameter smaller than that of the ceramic disk 2 and thinner than the thickness of the ceramic disk 2 may be interposed between the two, if necessary. Not connected to the shaft 3, that is, regardless of the rotation of the rotating shaft 3,
Moreover, by disposing guide members 5 each having a guide portion 5a integrally formed on the upper part between the ceramic discs 2, a plurality of these guide members 5 are arranged in a line when cutting objects such as paper inputted from above. The object can be successfully guided to the cutting actuator. In order to rotate together with the rotary shaft 3, the ceramic disk 2 which is such a blade member is provided with a detent 2b formed in the insertion hole 2a of the rotary shaft 3 drilled in the center, or a rotation stopper 2b is formed in the insertion hole 2a of the rotary shaft 3, or a rotation stopper 2b is formed in the insertion hole 2a of the rotary shaft 3. By making the cross-sectional shape of the rotary shaft 3 in a rectangular or oval shape, and forming an insertion hole 2a that matches the cross-sectional shape in the ceramic disc 2 and inserting it therethrough, the ceramic disc 2 is aligned with the axis of the rotary shaft 3. It can be moved freely in any direction. As a result, it is possible to easily assemble the cutting blade rolls 1 in a state in which they are alternately meshed with the respective ceramic discs 2 of the opposing cutting blade rolls 1.

The blade angle of the blade 2c formed on the outer periphery of the ceramic disc 2 shown in FIG. By combining the blades as shown in FIG. 2, a sheet-like object S such as paper, shown by dotted lines in the figure, is cut into strips.

Note that the most frequent cutting occurs almost at the center of the cutting blade roll, so the cutting characteristics deteriorate with long-term use. In this case, the ceramic disc 2
Only the parts can be easily replaced with new ones and can be repaired.

By the way, as the material for forming the ceramic disc 2 having the blade as described above, ceramic materials such as alumina, zirconia, silicon carbide, and silicon nitride, which have high hardness, high wear resistance, and high corrosion resistance, are suitable. In particular, zirconia ceramic is optimal because of its great toughness.

〔Effect of the invention〕

According to the present invention, as shown in the above, the facing ceramic discs of the cutting blade roll comprising a plurality of ceramic discs forming blades mesh with each other to rotate. In particular, the cutting edge will not rust or corrode,
Furthermore, due to its high wear resistance, the cutting characteristics do not deteriorate over an extremely long period of time compared to conventional steel blades, resulting in not only a longer life but also less noise during cutting. In addition to its small size, even if a part of the blade is spilled, you can remove the tightened nand,
By replacing only the defective ceramic disc, it is possible to provide an excellent sheet-shaped object cutting device that can always maintain good cutting characteristics.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the cutting blade rolls constituting the device of the present invention assembled together in a mounted state, Fig. 2 is an enlarged view of section A in Fig. 1, and Fig. 3 is the cutting blade roll shown in Fig. 1. FIG. 4 is a three-dimensional exploded view of FIG. 1, and FIG. 4 is a three-dimensional perspective view for explaining the cutting state of paper by the cutting blade roll constituting the apparatus of the present invention. S: Sheet-like object 1: Cutting blade roll 2: Ceramic disk 3: Rotating shaft

Claims (1)

[Claims] Two blade-cutting rolls are made by inserting a rotary shaft through a plurality of ceramic discs with blades formed on the outer periphery and a through-hole in the center to drive the rotation. A cutting device for a sheet-like object, characterized in that the ceramic disks are arranged so as to mesh with each other alternately, and the cutting is performed by the rotation of the ceramic disks as the rotary shaft is driven to rotate.