JPS6313739B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a document shredding machine.

In a conventional document shredding machine, as shown in FIG.
The left end surface only rubbed against the rotary blade 4, and the right end surface had nothing.

Therefore, if the shredded paper is inserted to the right of the left end surface of the rotary blade 3, there is nothing on the right side of the rotary blade 3 to hold down the shredded paper, so the shredded paper will be shredded as it is being shredded. The cut paper was drawn between the rotary blades 3 and 5 and wrinkled.

As a result, the shredded paper has the disadvantage that the shredded paper cannot be shredded in a constant width at both ends, unlike at the center of the cutter, and shredded paper cannot be reliably shredded.

Furthermore, due to the wrinkles between the rotary blades 3 and 5, the resistance during shredding increases, resulting in a reduction in the number of sheets to be shredded.

Therefore, an object of the present invention is to provide a document shredding machine that can reliably shred paper to both ends and prevent a decrease in the number of shredded sheets.

An embodiment of the present invention will be described with reference to FIGS. 2 and 3. In FIG. 2, 6 is the main body of the document shredding machine, and inside there are a pair of cutters 7, 8,
A motor 10 that drives one cutter 7 via a reducer 9, a frame plate 11 that supports both ends of the cutters 7 and 8, a column 12 that supports the two frame plates 11, and a motor 10 that drives the motor 10 between the frame plates 11. They each have screws 13 that support them.

FIG. 3 shows the engaged state of one end side of both cutters 7, 8 (the other end side of both cutters 7, 8 is symmetrical to FIG. 3). That is, one cutter 7 has a large number of rotary blades 15 extending circumferentially around the roller shaft 14.
a, 15b, 15c, 15d, . . . are arranged in parallel at predetermined intervals. In addition, the other cutter 8 is also
A large number of rotating blades 17 extend circumferentially around the roller shaft 16.
a, 17b, 17c, 17d, .
Tension rollers 18 (made of rubber or the like) having a smaller diameter than the shaft diameter of a are arranged concentrically. These cutters 7, 8 have roller shafts 14, 16 arranged parallel to each other, and their respective rotary blades 15a..., 17a...
are alternately engaged in sliding contact, and the outer peripheral surface of the rotary blade 15a at the end of one cutter 7 is brought into rolling contact with the outer peripheral surface of the tension roller 18 of the other cutter 8. Bearings 19 and 20 receive the roller shafts 14 and 16 of both cutters 7 and 8.

As a result of this configuration, the paper is shredded by the rotary blade 1.
Even if it is inserted to the right of the left end surface of 5a,
Since the tension roller 18 presses the edge of the shredded paper against the outer peripheral surface of the rotary blade 15a, the shredded paper is not drawn between the rotary blades 15a and 15b of the cutter 7 and wrinkles do not occur. Therefore, a predetermined shredding width can be ensured at both ends of the shredded paper as well as at the center of the cutter, so that confidentiality can be maintained.

Furthermore, since there are fewer wrinkles at both ends of the paper to be shredded, the resistance during shredding is reduced, resulting in the effect that the ability to shred sheets does not decrease.

As described above, the document shredding machine of the present invention has a large number of rotary blades arranged in parallel at predetermined intervals on each roller shaft, and the roller shafts are arranged in parallel and the rotary blades are alternately engaged with each other. first and second
cutter, and a tension roller that is fixed to the roller shaft of one cutter, is firmly attached to the outer surface of the outermost rotary blade of one cutter, and is in rolling contact with the outer circumferential surface of the outermost rotary blade of the other cutter. ,
This has the effect of reliably shredding paper to both ends and preventing a decrease in the number of shredded sheets.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a cutter section of a conventional document shredding machine, FIG. 2 is a sectional view of a document shredding machine according to an embodiment of the present invention, and FIG. 3 is a plan view of the cutter section thereof. 7, 8... Cutter, 14, 16... Roller shaft, 15a, 15b, 15c, 15d, 17a,
17b, 17c, 17d...rotary blade, 18...tension roller.

Claims (1)

[Claims] 1 First and second cutters each having a large number of rotary blades arranged in parallel at predetermined intervals on a roller shaft, the roller shafts being arranged in parallel and the rotary blades meshing alternately, and one cutter. A document shredding machine comprising: a tension roller fixed to the roller shaft of the cutter, firmly attached to the outer surface of the outermost rotating blade of one cutter, and rollingly contacting the outer peripheral surface of the outermost rotating blade of the other cutter.