JPS6138639A - 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 [Technical Field of the Invention] The present invention relates to a shredder for shredding paper.

[Prior art]

A shrender is an office machine that shreds discarded documents in order to prevent confidential information from leaking to the outside. A shredding device has been developed.

As a shredder of this type, there is a
The one disclosed in Publication No. 2 is typical. This shredder has a pair of parallel rotating shafts that are driven in opposite directions, and a rotating disk that has serrated crushing blades on its outer periphery that are fixed on these rotating shafts so that one is sandwiched between the other. and a stationary cutter member that is interposed between these rotating disks and has a fixed blade that is in contact with the rotating disk.The paper cut vertically by the rotating disk is cut between the rotating disk and the fixed blade of the stationary cutter member. It is configured to cut in the transverse direction.

However, in this type of conventional shredder,
Since the stationary cutter member is fixed between the rotating disks as a spacer, there is a problem in that it is difficult to assemble the members. That is, at the same time, a rotating disk is provided on the rotating shaft, and a stationary counter member that is stationary and has a gap WJ between these rotating shafts is placed on a different fixed shaft while checking the sliding contact state with the rotating disk. This is because it needs to be assembled. Furthermore, since the stationary cutter member having the function of a spacer comes into sliding contact with the rotating disk, there is also the inconvenience of generating frictional heat, which is not necessarily desirable as an apparatus for handling paper.

[Summary of the invention]

The present invention was made in view of the above circumstances, and includes first rotary blades that are alternately mounted on a rotary shaft so as to overlap each other in the axial direction at the outer circumference, and a small-diameter second rotary blade installed between them. To provide a shredder with an extremely simple structure in which the blades are mounted on a shaft and a fixed blade facing the second rotary blade faces between the first rotary blades, so that parts can be easily assembled. . Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

〔Example〕

FIG. 1 is a front view showing the main parts of a shredder according to the present invention. In the same figure, reference numerals 1 and 2 refer to a pair of parallel shafts rotatably supported between frames (not shown) of the shredder. These rotary wheels 1.2 are connected to a drive motor (not shown) and are driven to rotate in opposite directions indicated by arrows.

Reference numeral 3.4 denotes a plurality of first rotary blades that are mounted on the rotary shafts 1 and 2 along the axial direction. These first rotary blades 3, 4 are formed into a disk shape with a diameter larger than the facing interval of the rotary shaft 1.2, and have cutting blades 3a, 4, 1 in the circumferential direction on the outer periphery. They are fixed by keys 5 and 6 alternately so as to overlap in the axial direction. In other words, the first rotary blades 3 and 4 are arranged such that one of the first rotary blades 3 and 4 can cut the sheet material S such as paper with the cutting blades 3a and 4a.
The rotary blade a is mounted between the other first rotary blades 4, 4 (one not shown).

Reference numeral 7.8 denotes a plurality of second rotary blades mounted between the first rotary blades 3.4 on the rotary shafts 1 and 2 by the keys 5 and 6, and these second rotary blades 7.゜8 is the first rotary blade 3.
The cutting blade 7a, 8a is formed in the shape of a disk having a smaller diameter than that of 4, and has sawtooth-like cutting blades 7a and 8a on the outer periphery for cutting in the axial direction. Further, the second rotary blades 7 and 8 are formed to have approximately the same thickness as the first rotary blades 3.4, and are used as spacers for maintaining the distance between the first rotary blades 3 and 4.

Reference numerals 9 and 10 denote a plurality of fixed blades arranged so as to face between the first rotary blades 3, 3 and the first rotary blades 4, 4 (one of which is not shown); 1.2 are fixed alternately along the axial direction on fixed shafts 11 and 12 that are mounted parallel to each other.

The fixed blade 9 has a protruding part 9a that protrudes to approach the cutting blade 4a of the first rotary blade 4 from below, and a tooth part 9b that opposes the cutting blade 7a of the second rotary blade 7. Projection 9
An arcuate guide surface 9c that guides the vertically cut sheet material S to the toothed portion 9b is formed between the toothed portion 9b and the toothed portion 9b. The fixed blade 10 is formed symmetrically with the fixed blade 9.

That is, 10a is a protrusion approaching the first rotary blade 3;
10b is a tooth portion of the second rotary blade 8 that is in contact with the cutting blade 8a;
10c is a guide surface.

In the shredder configured in this way.

First, a sheet material S such as paper is fed from above and is vertically cut by the first rotary blades 3 and 4, and then cut by the i-th rotary blade 7.
, 8 and the fixed blades 9, 10, and are shredded into fine chips that cannot be reread.

Here, a second cut is performed, which is a horizontal cut with greater cutting resistance than a vertical cut.
Since the rotary blades 7 and 8 have a smaller diameter than the first rotary blades 3 and 4, the cutting force can be increased without increasing the torque of the rotary shaft 1.2. can be ensured.

Further, during assembly, since the second rotary blade 7.8 is mounted between the first rotary blades 3 and 4, it can function as a spacer. Therefore, by mounting these members with the same keys 5 and 6, the first rotary blades 3 and 4
can be provided at intervals. On the other hand, the fixed blade 9,
10 is arranged to face between the first rotary blades 3 and 4, so by fixing it on the fixed shaft i1.12 that is mounted below and outside of the first rotary blades 3 and 4. Can be assembled.

Therefore, the rotary member can be assembled on the rotating shaft 1.2, the stationary member on the fixed shaft 11.12, and so on separately, but with the same member.

Furthermore, since the fixed blades 9 and 10 do not function as spacers, there is no need for them to be in sliding contact with the first rotating blade 3.4.
Friction is reduced. Therefore, no frictional heat is generated, and the load on the rotating shafts 1 and 2 due to frictional resistance is also reduced.

FIG. 2 is a front view of main parts showing another embodiment, and in this figure, members that are the same or equivalent to those shown in FIG.

Reference numeral 13.14 denotes a fixed blade assembled so as to face between the first rotary blades 3 and 4, and is formed to have a smaller width than that shown in FIG. are fixed alternately. The tip end includes an arcuate surface 13a that guides and cuts the sheet material S.

14a extends close to the first rotary blade 4.3 and in contact with the second rotary blades 7,8.

This embodiment also has the same effects as the embodiment shown in FIG. 1, and since the second rotating blades 7 and 8 can function as spacers, the rotating member and stationary member can be separated Moreover, they can be assembled using the same members.

〔Effect of the invention〕

As explained above, according to the present invention, since the second rotary blade is mounted between the first rotary blades mounted on the rotary shaft, the second rotary blade is attached to the spacer of the first rotary blade. Since the fixed blade facing the second rotating blade faces between the first rotating blade, the fixed blade can be assembled outside the first and second rotating blades. I can do it.

Therefore, since the rotary blade, which is a rotating member, and the fixed blade, which is a stationary member, that constitute the device can be assembled separately, the assembly is easier than when the rotating member and the stationary member are assembled at the same time. There is an effect. Further, since there is no sliding contact between the rotating member and the stationary member, friction is reduced. As a result, there is an advantage that no frictional heat is generated and the load on the rotating shaft due to frictional resistance is reduced. Furthermore, since the second rotary blade that performs transverse cutting has a smaller diameter than the first rotary blade, it is possible to reliably cut in the transverse direction.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of a shredder according to the present invention, and FIG. 2 is a front view of the main parts showing another embodiment. 1.2... Rotating shaft, 3, 4... First rotating blade,
3a, 4a... Cutting blade, 7, 8... Second rotating blade, 7a, 8a... Cutting blade, 9.10... Fixed blade, S... Sheet material .

Claims (1)

[Claims] First rotary blades having cutting blades on the outer periphery are alternately mounted on a pair of parallel rotating shafts that are rotationally driven in opposite directions so as to overlap in the axial direction at the outer periphery of each other, and these first rotational blades are A second rotary blade having a cutting blade on an outer periphery with a smaller diameter is mounted between the blades, and a fixed blade facing the second rotary blade faces between the first rotary blades. Shredder to do.