JPS6034898B2 - Document shredding machine cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document cutting machine used for cutting and disposing of documents in government offices, companies, etc., especially confidential documents that are no longer needed. It relates to a cutter built into a pongee cutting machine.

Conventionally, there has been a known document pruning machine that cuts unnecessary confidential documents vertically and horizontally. A large number of circular chopping blades are thinned in parallel at a constant pitch. Therefore, the distance between the two rotation axes is determined such that the opposing pongee cutting blades overlap at a part of their peripheral green parts, and
Each shredding blade is assembled to the rotating shaft such that the pongee cutting blade on one rotating shaft side fits between the two shredding blades on the other rotating shaft side.

The circular shredding blade has, on its circumference, alternating notches and arcuate portions for cutting across documents.

By rotating both rotating shafts so that the notch of the string cutting blade on one rotating shaft intersects with the arc of the pongee cutting blade on the other rotating shaft, documents can be cut vertically and horizontally. becomes.

Therefore, it is necessary for the multiple string cutting blades that are integrally assembled to both rotating shafts to be fixed to the rotating shafts while being accurately positioned in all directions around the respective rotating shafts. This is the technical premise for

Furthermore, in order to reduce the document cutting load on the pongee cutting blade when cutting documents horizontally, a large number of vertical cutting blades on each rotating shaft side are
The notches and arcuate portions are arranged in parallel in a spiral manner with respect to the entire length of the shaft so that the positions of the adjacent cord cutting blades are shifted by 1,000 degrees.

According to other types of document pruning machines, a large number of pongee cutting blades arranged in parallel are divided into several blocks, and the notch of the pongee cutting blades is shifted in position in each block with respect to other blocks. , All the shredding blades are arranged in parallel to the rotating shaft to form a cutter.

As a result of the above, in conventional document string cutting machines, determining the relative positions of opposing pongee cutting blades and assembling a large number of pongee cutting blades to the rotating shaft is extremely troublesome and costly. There were drawbacks.

An object of the present invention is to provide a cutter for a document shredding machine that is free from the hassle of relative positioning of shredding blades on two rotating shafts.

To achieve this object, the present invention has a shaft in which a large number of circular pongee cutting blades each having alternating arcuate blade parts and cutout parts are assembled in parallel in a freely rotatable state. A large number of shredding blades are assembled in parallel in a rotatable state, and the shafts are arranged parallel to each other with the Ryofuji pongee blades interlocking with each other, and at least one of the shafts is The shaft is rotationally driven, and the document inserted between the integrally rotating side Tsumugi cutting blade and the meshing Tsumugi cutting blade causes the freely rotating side Tsumugi cutting blade to follow and rotate, thereby causing the circular arc blade of the Tsumugi cutting blade on the Ichimari side. overlap the front edge of the arcuate blade with the rear edge of the arcuate blade of the shredding blade on the other shaft side, press the document between both edges, and at the same time press the front edge of the arcuate blade of the other shredding blade on the mari side. It is characterized in that the side edge overlaps the green circumference of the notch of the tsumugi cutting blade on the side of the first sea bream so as to cross the document. Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 is a plan view of a cutter in a document shredding machine. A rotating shaft 4 and a shaft 5 are supported by bearing members 2 and 3 which are arranged at a constant interval. The shaft 5 is a free rotation shaft or a fixed koji. The rotating shaft 4 is coupled to a drive shaft 7 having a pulley 6 via a gear train (not shown). A large number of circular pongee cutting blades 8 as shown in FIG.

The distance between these pongee cutting blades 8 is constant over the entire length of the rotating shaft 4. Moreover, a document insertion guide plate 10 suspended and supported by a fixed shaft 11 is inserted between each shredding blade 8 . A portion of these document insertion guide plates 10 is in contact with the fixed ratchet 12 with a curved surface. This results in
The document insertion guide plate 10 can swing slightly around the fixed shaft 11. A large number of circular pongee cutting blades 14 as shown in FIG. 2 are fitted on the outer side of the shaft 5. As shown in FIG.

These shredding blades 14 are in a state where they are freely rotatable with respect to the shaft 5. Furthermore, a document insertion guide plate 10 suspended and supported by the fixed shaft 13 is inserted between each paper cutting blade 14, as in the case of the rotating shaft 4. On the entire circumference of the shredding blades 8 and 14, circular arc blade portions 15 of the same shape are provided.
are cut out through the same-shaped notch 16 (in FIG. 2, one
2 pieces) are formed.

The surface of the notch 16 is cylindrical. The curvature of the surface of this notch 16 is larger than the curvature of the chopping blades 8 and 14. When the above-mentioned shredding blades 8 are assembled to the rotating shaft 4, all the pongee cutting blades 8 are divided into several blocks, and the position of the arcuate blade part 15 or the notch part 16 of the pongee cutting blade 8 is The engagement positions of the weaving blade 8 and the key 9 are set so as to be shifted block by block (see FIG. 3).

On the other hand, when the pongee cutting blade 14 is assembled to the shaft 5, the relative position of the pongee cutting blade 14 and the pongee cutting blade 8 is not considered at all.

Hereinafter, the state in which the document 17 is cut vertically and horizontally by the above-mentioned cutter 1 will be explained.

First, as shown in FIG. 4, while the shredding blade 8 on the rotary shaft 4 side is being rotated counterclockwise, the document 1 is cut from above.
7 is inserted between the pongee cutting blades 8 and 14.

When the arcuate blade part 15 of the pongee cutting blade 8 comes into contact with this document 17 and almost overlaps with a part of the circular arc blade part 15 of the pongee cutting blade 8 or a part of the periphery 16a of the notch part 16, the document 17 is cut by the vertical cutting blade. It starts to get caught between 8 and 14. That is, the cord cutting blade 14 on the shaft 5 side begins to be driven to rotate due to the frictional force between this cutting blade 14 and the document 17. Arc blade portion 15 of the shredding blade 8
In the case where almost overlaps with a part of the Tsumugi cutting blade 14, first,
When the arcuate blade portion 15 of the Tsumugi cutting blade 8 overlaps the circular arcing blade portion 15 of the Tsumugi cutting blade 14, the document 17 immediately begins to be vertically cut by the Tsumugi cutting blades 8 and 14, so the Tsumugi cutting blade 14 also rotates slightly. After that, the notch 16 of the Tsumugi cutting blade 8 becomes the Tsumugi cutting blade 1.
At the point when the document 17 is overlapped with the arcuate blade part 15 of No. 4, the force to draw the document 17 disappears from the overlapping relationship between the pongee cutting blades 8 and 14, so the shredding blade 14 stops rotating and only the pongee cutting blade 8 rotates counterclockwise. Continue rotating in the direction.

As a result, as shown in FIG.
When the pongee cutting blade 8 rotates to a position where the rear edge 15b of the document 17 overlaps the front edge 15a' of the circular arc blade part 15 of the vertical blade 14, the document 17 is moved between the rear edge 15b and the front edge. It is held between 15a''. As a result, the document 17 is pulled downward. In FIG. 4, this clamping position is shown as part A. In the above part A, when the rear end side edge 15b of the arcuate blade part 15 of the shredding blade 8 and the front end side edge 15a' of the arcuate blade part 15 of the shredder blade 14 overlap, in the part B, the pongee cutting blade 8 The front end side edge 15a of the arcuate blade portion 15 is the peripheral green 16a of the cutout portion 16 of the shredding blade 14.
overlaps near the bottom of ′.

Thereafter, with the rotation of the rotating shaft 4 in the counterclockwise direction in FIG. 4, the vertical cutting of the document 17 continues, and the document 17 at that time
Due to the cutting resistance, the pongee cutting blade 14 on the shaft 5 side is also driven to rotate. Due to the driven rotation of the shredding blade 14, the positional relationship between the pongee cutting blades 8 and 14 shifts from the state shown in FIG. 4 to the state shown in FIG. 5.

In the state shown in FIG. 5, the document 17 is held between the rear edge 15b' of the arcuate blade part 15 of the pongee cutting blade 14 and the front edge 15a of the arcuate blade part 15 of the pongee cutting blade 8. , the front edge 15a' of the arcuate blade part 15 of the cord cutting blade 14
overlaps the peripheral edge 16a of the notch 16 of the pongee cutting blade 8, so that the front edge 15a' of the arcuate blade part 15 of the shredding blade 14
cuts the document 17 horizontally, and then cuts it vertically as the pongee cutting blades 8 and 14 rotate. This vertical and horizontal crossing position is shown as section C in FIG. On the other hand, in the case where the arcuate blade portion 15 of the shredding blade 8 substantially overlaps a part of the pongee blade 14, the front edge 15a of the arcuate blade portion 15 of the pongee blade 8 overlaps the cutout portion 16 of the pongee blade 14. When overlapping the peripheral edge 16a, even if the document 17 is inserted between the string cutting blades 8 and 14, the pongee cutting blade 1
4 or the rear edge 15b of the arcuate blade part 15 of the pongee blade 8.
does not reach the overlapping portion between the front end side edge 15a and the peripheral edge 16a of the notch 16 of the pongee cutting blade 14.

Therefore, the document 17 is not drawn between the pongee cutting blades 8 and 14, and only the weaving cutting blade 8 rotates counterclockwise in FIG. 4 or 5.

Therefore, as shown in FIG.
When the shredding blade 8 rotates to the gripping position of the document 17 where the rear edge 15b of the pongee cutting blade 14 overlaps the front edge 15a' of the arcuate blade part 15 of the pongee cutting blade 14, the document 17 and the pongee cutting blade 14 are Due to the frictional force between them, the pongee cutting blade 14 on the shaft 5 side also begins to rotate. The subsequent operations of the pongee cutting blades 8 and 14 are as already explained. As mentioned above, the shredding blade 14 on the shaft 5 side is driven by the frictional force between the document 17 and the shredding blade 14 when the document 17 to be shredded is drawn between the shredding blades 8 and 14.
The optimum cutting position for the shredding blade 8 is automatically set. Hereinafter, another embodiment of the present invention will be described in which the document 17 can be drawn between a pair of pongee cutting blades even when the document 17 is a soft paper or a thin sheet of paper.

In the following description, the same reference numerals are used to indicate the same parts as in the previous embodiment. Accordingly, in the case of another embodiment of the present invention, the pith 5a into which the free rotation side pongee cutting blade 14 is externally inserted is also driven to rotate.

Since a frictional force is exerted between the pongee cutting blade 14 and the outer circumferential surface 5b of the shaft 5a, the shredding blade 14 also rotates following the shaft 5a (see FIG. 6). The frictional force between the Tsumugi cutting blade 14 and the ball 5a is
When the shredding blade 14 is rotationally driven by the drawn document 171, slippage is small enough to occur between the shredding blade 14 and the shaft 5a. The rotational speed of the shaft 5a is preferably smaller or larger than the rotational speed of the forcibly driven shaft 4 that forcibly rotates the shredding blade 14.

This prevents the arcuate blade portions 15 of the shredding blades 8 or 14 from overlapping each other as much as possible, and facilitates insertion of the document 17. When the document 17 is drawn between the shredding blades 8 and 14 from its tip side, the pongee cutting blade 14 on the shaft 5a side is rotationally driven by the moving document 17.

The manner in which the document 17 is cut vertically and horizontally by the pongee cutting blades 8 and 14 is the same as in the previous embodiment.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the cutter of the present invention in a document pruning machine, Fig. 2 is a side view of the meshing relationship between the pruning blade on the forced drive side and the shredding blade on the free rotation side, and Fig. 3. is a thin perspective view of the Tsumugi cutting blade on the rotating shaft side, Figures 4 and 5 are partially cutaway side views illustrating the vertical and horizontal cutting operations of documents by the Tsumugi cutting blade, and Figure 6 is a partially cutaway side view. , is a side view of the meshing relationship between the forced drive side pongee cutting blade and the free rotation side pongee cutting blade in another embodiment of the present invention. 1... Cutter, 4... Rotating shaft, 5 and 5a... Shaft, 8 and 14... Tsumugi cutting blade,
15...Circular blade part, 15a and 15...
Front edge of the arcuate blade part, 15b and 15b'...
・・Rear end side edge of arcuate blade part, 16 ・・・Notch part, 1
6a and 16a'... Green around the notch, 17...
····document. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A shaft in which a large number of circular shredding blades with alternating circular arc blade parts and cutout parts are assembled in parallel in a freely rotatable state, and a large number of the same shredding blades can rotate together. The shafts are assembled in parallel in a state of The shredding blades and the documents inserted between the meshing shredding blades cause the freely rotating shredding blades to follow and rotate, thereby causing the front end edge of the arcuate blade part of the shredding blade on the side of one shaft to move toward the side of the other shaft. Align the rear edge of the arcuate blade of the shredding blade and press the document between both edges.
At the same time, a cutter for a document shredding machine in which the front edge of the arcuate blade part of the shredding blade on the other shaft side is overlapped with the periphery of the notch part of the shredding blade on the one shaft side to cross the document.