JPH034944A - Shredding apparatus of document shredder - Google Patents

Abstract

PURPOSE:To certainly shred paper into a chip form by a method wherein the length between the contact position of a roller cutter and a pressure contact roller and the contact position of discharge rollers is set so as to be smaller than the peripheral surface length between respective straight blades and the peripheral speed of the discharge rollers is set so as to become faster than that of the roller cutter. CONSTITUTION:When paper is charged, the paper is fed with the rotation of a roller cutter 5 to be slit by a circular blade and straight blades 8 and, next, the slit paper is fed to discharge rollers 3, 4. At this time, even when the paper is fed by L, the interval of the slits in the lateral direction is same to the interval (l) between the straight blades 8 and, when the first slit in the laterial direction approaches the contact position B of the discharge rollers 3, 4, the slit in the lateral direction due to the next straight blade 8 is not yet formed. Since the peripheral speed of the discharge rollers 3, 4 is faster than that of the roller cutter 5, the paper is torn off to be shredded into chips.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a shredding device in a document shredding machine that shreds unnecessary documents to make them unreadable.

<Prior art> As the shredding device of conventional document shredding machines, the compression shredding method uses a shredding blade that rotates on two parallel axes and a number of spacers that do not rotate, and the shredder blades on both axes They are arranged so that they mesh with each other alternately, and the notch of the shredding blade on one shaft is always located between the notches of the shredding blade on the other shaft, thereby shredding into chips.

In the spiral cutting method, circular cutting blades are alternately engaged with two shafts to perform vertical cutting, and a spiral blade and a fixed blade are used to shred the material into chips.

Problems to be Solved by the Invention 〉 However, conventional shredding devices are composed of metal parts, and have problems such as high processing accuracy, very high costs, and high assembly accuracy.

In view of the above, the present invention is small, lightweight, and low in cost.
Moreover, the object is to provide a shredding device that is easy to assemble.

<Means for Solving the Problems> The means for solving the problems according to the present invention are as shown in FIGS. 1 to 8,
The cutting device 2 includes a cutting device 2 that cuts the paper l, and a pair of ejection rollers 3.4 disposed on the paper traveling direction side from the cutting device 2. The cutting device 2 is in pressure contact with a roller cutter 5 and the roller cutter 5. and a pressure roller 6,
The roller cutter 5 includes a roller portion 9 having a plurality of straight blades 8 on its circumferential surface parallel to the axial direction of the cutter shaft 7, and a circular blade adjacent to the roller portion 9 perpendicular to the axial direction of the cutter shaft 7. A plurality of lO are arranged in the axial direction of the cutter shaft 7, and the length between the contact position A of the roller cutter 5 and the pressure roller 6 and the contact position B of the discharge roller 3.4 is , is set to be smaller than the length a on the circumferential surface between each straight blade 8, and the ejection roller 3.4
The circumferential speed of the roller cutter 5 is set to be faster than the circumferential speed of the roller cutter 5.

Effect> In the above problem solving means, when the paper 1 is input, the paper 1 is conveyed as the roller cutter 5 rotates,
A cut is made by a circular blade 10 and a straight blade 8. Next, the paper 1 with the cut is transferred to the ejection roller 3
．． Sent to 4. At this time, even if the paper 1 is fed by L, the interval between the horizontal cuts is a, which is the same as the interval between the straight blades 8, and the first horizontal cut approaches the contact position B of the discharge roller 3.4. Sometimes the lateral cut by the next straight blade 8 has not yet been made. Moreover,
Since the circumferential speed of the discharge rollers 3 and 4 is faster than the circumferential speed of the roller cutter 5, the paper l is torn off and shredded into chips.

Therefore, the length between the contact position A of the roller cutter 5 and the pressure roller 6 and the contact position B of the discharge roller 3.4 is smaller than the length ρ on the circumferential surface between each straight blade 8. Moreover, since the circumferential speed of the discharge roller 3.4 is set to be faster than the circumferential speed of the roller cutter 5, the paper l can be reliably shredded into chips.

In addition, the roller part 9 can be made of resin by integrally molding the straight blade 8, and the roller cutter 5 can be formed integrally with the circular blade IO, so the shredding device can be miniaturized, and the pressure welding Due to force shredding, discharge roller 3
．． 4 can also be made of resin, making the shredding device smaller and lighter, making assembly easier and lowering costs.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure is a perspective view of a shredding device showing an embodiment of the present invention, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a longitudinal cross-sectional view of a document shredding machine equipped with the shredding device of the present invention, and FIG. 5 is a perspective view of the straight blade, 6 is a perspective view of the circular blade, 7 is a front view of the paper that has passed through the cutting device, and 8 is the paper that has passed the discharge roller. FIG.

The shredding device of the document shredding machine of the present invention is as shown in Fig. 1.2.
The cutting device 2 includes a cutting device 2 for cutting the paper 1, and a pair of driving cartwheel and driven discharge rollers 3.4 disposed on the paper traveling direction side from the cutting device 2. The cutting device 2 includes a roller cutter 5 and The roller cutter 5 has a plurality of straight blades 8 parallel to the axial direction of the cutter shaft 7 on its circumferential surface.
A plurality of circular blades 10 adjacent to the roller portion 9 and perpendicular to the axial direction of the cutter shaft 7 are arranged in the axial direction of the cutter shaft 7.

The length between the contact position A of the roller cutter 5 and the pressure roller 6 and the contact position B of the discharge roller 3.4 is longer than the length a on the circumferential surface between the straight blades 8. Moreover, the peripheral speed of the discharge roller 3.4 is set to be faster than the peripheral speed of the roller cutter 5.

The document shredding machine according to the present invention, as shown in FIG. a drive device 12 that rotationally drives the press roller 6 and the driven discharge roller 4, a pressure contact device summer 3 that brings the pressure roller 6 and the driven discharge roller 4 into pressure contact with the roller cutter 5 and the drive discharge roller 3, respectively, and a guide plate formed on the upper surface of the main body 11. a paper supply port 15 consisting of a paper supply port 14; a shredded waste discharge port 17 consisting of a guide plate 16 formed under the discharge roller 3.4;
A storage box 19 for storing shredded waste 18 is provided at the bottom of the main body 11 in a detachable manner.

The roller cutter 5 has a cutter shaft 7 that is perpendicular to the input direction of the paper l input from the paper supply port 15, and the roller part 9 and the circular blade 10 are disposed at both ends. The circular blades IO and the roller portions 9 are fitted alternately, and the roller portions 9 are fitted with a phase shift of 60 degrees.

As shown in FIG. 1, the cutter shaft 7 has both end portions 7a formed in a cylindrical shape, and a base portion 7b formed in a hexagonal shape to fit into the roller portion 9 and the circular blade 10. is rotatably supported. Both ends of the roller cutter 5 are fixed to the base 7b of the cutter shaft 7 with split rings 20.

As shown in FIG. 5, the straight blade 8 has a hole 21 formed in the center to prevent removal, and has an acute-angled blade surface 8a at the tip. Three straight blades 8 are arranged parallel to the axial direction of the roller part 9 at intervals of 120 degrees, as shown in FIG.
It is fixed in a protruding state by being fitted into the resin or integrally formed.

As shown in FIG. 6, the circular blade IO has an acute-angled blade surface 1 on the outer periphery.
0a, and a hexagonal shaft hole tob for fitting the cutter shaft 7 is formed in the center.

The pressure roller 6 is made of resin such as polyethylene or highly hard rubber, and is rotatably supported by the main body 11 via a roller shaft 22.

The discharge roller 3.4 is a resin roller coated with rubber, and is arranged parallel to the cutter shaft 7 and the roller M22.

The drive-side discharge roller 3 is supported by the main body II by a drive shaft 23 driven by the drive device 12, and the other driven-side discharge roller 4 is rotatably supported by the main body 11 by a driven shaft 24. There is.

As shown in FIG. 2, the cutting device 2 and the discharge roller 3.4 have a length between the contact position A of the roller cutter 5 and the pressure roller 6 and the contact position B of the discharge roller 34. , are arranged at intervals smaller than the length a on the circumferential surface between the straight blades 8.

The drive device 12 includes a motor 25 with a reduction gear, a motor pulley 26 of the motor 25, and a roller cutter 5.
A drive belt 28 is wound around the cutter pulley 27, and a transmission belt 30 is wound around the cutter pulley 27 and the roller pulley 29 of the drive side discharge roller 3. And the cutter pulley 2
7 and roller pulley 29 are externally fitted and fixed to cutter shaft 7 and drive shaft 23, respectively. Further, since the outer diameter of the cutter pulley 27 is larger than the outer diameter of the roller pulley 29, the discharge rollers 3 and 4
The circumferential speed of the roller cutter 5 is faster than that of the roller cutter 5.

The pressure welding device 13 has a roller shaft 22 of the pressure roller 6.
bearing 22a and the driven shaft 24 of the driven side discharge roller 4
A pressure lever 31 that contacts the bearing 24a of the pressure lever 31, and a pair of springs 32a and 32b that are attached to both ends of the pressure lever 31 and bias the pressure lever 3I in the direction of the roller cutter 5 and the drive side discharge roller 3. , the spring 32a,
The other end of 32b is attached to fixing pins 33a and 33b of main body 11. The pressure lever 31 is movably attached to the main body 11 via a pressure adjustment pin 34.

In the above configuration, when the power switch is turned on, the motor 25 rotates, and the roller cutter 5 rotates via the drive belt 28 as indicated by the arrow in FIG. Along with that,
The pressure roller 6 that is in pressure contact with the roller cutter 5 is also rotated. Further, the driving force is transmitted from the cutter pulley 27 of the roller cutter 5 to the roller pulley 29 via the transmission belt 30, the drive-side discharge roller 3 rotates, and the driven-side discharge roller 4 also rotates at the same time. At this time, since the cutter pulley 27 has a larger diameter than the roller pulley 29, the circumferential speed of the discharge roller 3.4 becomes faster than the circumferential speed of the roller cutter 5.

Then, when a paper l such as an unnecessary document is inputted from the paper supply port 15, the paper l is conveyed as the roller cutter 5 rotates, and since the pressure roller 6 is in contact with the circular blade lO and the straight blade 8, the seventh A longitudinal cut 35 and a transverse cut 36 are made as shown.

Next, the cut paper l is sent to the discharge roller 34. At this time, even if the paper l is fed by L, the interval between the horizontal cuts 36 is the distance between the straight blades 8, and the first horizontal cut 36 is at the contact position B of the discharge roller 3.4. When you get close to the next straight blade 8
The lateral cut 36 due to this has not yet been made. Moreover, since the circumferential speed of the discharge roller 3.4 is faster than the circumferential speed of the roller cutter 5, the paper l is pulled and torn off into chip-shaped shredded waste 18 as shown in FIG. It is discharged and deposited in the storage box 19.

Therefore, the roller portion 9 can be made by integrally molding the straight blade 8 and made of resin. And circular blade IO
Since the roller cutter 5 is formed integrally with the shredding device, the shredding device can be made smaller. In addition, since the shredding is performed by pressing force, the discharge rollers 3.4 can also be made of resin, making the shredding device smaller and lighter, making assembly easier and lowering costs.

Further, the length between the contact position A of the roller cutter 5 and the pressure roller 6 and the contact position B of the discharge roller 3.4 is longer than the length Q between the straight blades 8 on the circumferential surface. Since the circumferential speed of the discharge roller 3.4 is set to be faster than the circumferential speed of the roller cutter 5, the paper 1 can be reliably shredded into chips.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, if the length [7] between the contact position A of the roller cutter 5 and the pressure roller 6 and the contact position B of the discharge roller 3.4 is smaller than the length Q on the circumferential surface between each straight blade 8, For example, the circumferential speed of the discharge roller and the roller cutter may be equal.

<Effects of the Invention> As is clear from the above description, the present invention includes a cutting device that cuts paper, and a pair of discharge rollers disposed on the paper advancing direction side from the cutting device, and the cutting device , consisting of a roller cutter and a pressure roller pressed against the roller cutter, the roller cutter having a roller portion having a plurality of straight blades on the circumferential surface parallel to the axial direction of the cutter shaft, and a roller portion adjacent to the roller portion. Since a plurality of circular blades perpendicular to the axial direction of the cutter shaft are arranged in the axial direction of the cutter shaft, the roller part can be made of resin by integrally molding the straight blades.
A roller cutter can be formed integrally with the circular blade, and the discharge roller can also be made of resin for shredding by pressure force, making the shredding device smaller and lighter, making assembly easier and lower costs. can.

Further, the length between the contact position of the roller cutter and the pressure roller and the contact position of the discharge roller is set to be smaller than the length on the circumferential surface between each straight blade, and the circumferential speed of the discharge roller is set to Since it is set to be faster than the circumferential speed of the roller cutter, it has the excellent effect of reliably shredding paper into chips.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a shredding device showing an embodiment of the present invention;
3 is a longitudinal sectional view of a document shredding machine equipped with the shredding device of the present invention, FIG. 4 is a sectional view of the roller section, FIG. 5 is a perspective view of the straight blade, and FIG. The figure is a perspective view of the circular blade, FIG. 7 is a front view of the paper that has passed through the cutting device, and FIG. 8 is a front view of the paper that has passed the discharge roller. l・Paper, 2: Cutting device, 3.4=Discharge roller 5. Roller cutter, 6: pressure roller, 7 two cutter shafts,
8. Straight blade, 9: Roller part, lO: Circular blade, A
: Contact position, B: Contact position. Applicant Sharp Corporation

Claims (1)

[Claims] A cutting device that cuts paper; and a pair of discharge rollers disposed on the paper traveling direction side from the cutting device; the cutting device includes a roller cutter and a pressure roller that is pressed against the roller cutter; A roller cutter has a roller portion having a plurality of straight blades on the circumferential surface parallel to the axial direction of the cutter shaft, and a circular blade adjacent to the roller portion and perpendicular to the axial direction of the cutter shaft. A plurality of straight blades are arranged in a direction, and the length between the contact position of the roller cutter and the pressure roller and the contact position of the discharge roller is set to be smaller than the length on the circumferential surface between each straight blade. . A shredding device for a document shredding machine, wherein the circumferential speed of the discharge roller is set to be faster than the circumferential speed of a roller cutter.