JP2009119454A - Shredder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of noise in cutting paper by a shredder, particularly caused by flapping of paper occurring when shredded paper is bitten in a cutter. <P>SOLUTION: Tension imparting rollers 4 constituted to rotate in the opposite directions by facing two rollers 6, 9 in parallel to the cutter 1, are disposed in the advancing direction of the paper P to be shredded and in this side of the cutter 1 constituted to rotate in the opposite direction by facing two shredding blades 1a, 1b to each other, and a sending speed of paper to be shredded of the tension imparting rollers 4 is set to be slower than a cutting speed of the paper to be shredded of the cutter 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention aims to prevent the generation of noise when cutting paper with a shredder, and in particular, to prevent the generation of noise due to paper flapping that occurs when the paper is bitten by a cutter. It is.

  There are two types of noise sources when shredding paper shredding, noise generated by shredding paper with a cutter and noise caused by paper fluttering when paper is bitten into the cutter.

  For example, Japanese Patent Application Laid-Open No. H10-133707 discloses a configuration in which noise generated by chopping paper with a cutter does not leak to the outside. This is provided with a pair of conveying rollers formed of a sound absorbing member in front of a cutting blade for cutting paper.

In the device disclosed in Patent Document 1, the noise generated inside the shredder is blocked by a roller from leaking outside. Another object of the present invention is to reduce the noise caused by the vibration of the paper when chopping with the chopping blade.
JP 9-234382 A

  However, the method described in Patent Document 1 may have some effect of preventing noise from leaking to the outside by blocking with a roller formed of a sound absorbing member, but when paper is bitten into the cutter It does not help to prevent noise caused by flapping paper.

  That is, as described in Patent Document 1, when the gap between the two rollers is not variable and the roller is formed of a material having a large amount of deformation, and the roller is simply used for conveyance to a paper shredding blade, Even if a long guide plate is provided between the roller and the shredder blade, it may be possible to prevent some paper vibrations, but there is room for the paper to play on the guide plate, so the paper can be used as a shredder blade. It has no effect on fluttering noise that occurs when biting. Further, in the case of the one described in Patent Document 1, the guide plate may exhibit some effect when the paper insertion direction is close to the horizontal direction, but it is quite effective when the paper insertion direction is vertical. Absent.

  Therefore, as a result of earnest research by the present inventor, in order to prevent noise caused by paper fluttering that occurs when paper is bitten by the cutter, when the paper is bitten by the cutter, there is no play in the paper and it is taut That is, it has been found that it is effective to maintain a state in which a tension is applied by being sandwiched between rollers. By maintaining such a state (a state in which the paper is always tensioned), the paper does not flutter when the paper is bitten by the cutter.

  On the other hand, when the paper is clamped with a roller to apply tension to the paper, it is necessary to make the structure so that the paper does not wrap around the roller and is reliably fed to the cutter even if the paper is curled. It was. That is, in the case of paper with a curl, if it is nipped by a roller to try to feed the paper, it will be easily wrapped around one of the rollers, causing a phenomenon that the paper cannot be sent to the cutter.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a shredder that prevents generation of noise due to flapping of paper that occurs when paper is bitten into a cutter. It is to be.

  Another object of the present invention is to provide a shredder that ensures that the paper is fed to the cutter without curling the paper around the roller even if the paper is curled.

  In order to achieve the above object, the shredder according to the present invention is configured so that the shredder is disposed in the forward direction of the shredded paper so that two shredded blades face each other and rotate in opposite directions. A tension applying roller configured to face two rollers in parallel with each other and rotate in opposite directions, and the shredding paper feed speed of the tension applying roller is higher than the shredding paper cutting speed of the cutter. It is slow.

  According to another aspect of the present invention, in addition to the above invention, the shredded paper feed speed of the tension applying roller is 50% to 95% of the shredded paper cutting speed of the cutter.

  Moreover, another aspect of the present invention is such that, in addition to the above-described invention, the distance between the tension applying roller and the cutter is 10 mm to 50 mm at a position where the outer peripheral surfaces are closest to each other.

  According to another aspect of the present invention, in addition to the invention, the tension applying roller includes a driving roller and a driven roller, and a gap between the driving roller and the driven roller is variable. The driven roller is the driving roller. The stopper is provided so as to be biased in the direction in contact with and not to open more than a certain distance.

  According to another aspect of the present invention, in addition to the above-mentioned invention, a groove is formed in the rotation direction at an appropriate interval in the tension applying roller, and the paper discharge claw is positioned so that its tip is located in the groove. It is disposed between the tension applying roller and the cutter.

  According to another aspect of the present invention, in addition to the above invention, the groove portion is formed in the rotational direction at an appropriate interval in the tension applying roller, and a paper guide is provided between the tension applying roller and the cutter, and the paper The guide is provided with a rib whose tip is located in the groove and functions as the paper discharge claw.

  In another aspect of the present invention, in addition to the above-described invention, the groove portions formed on the tension applying roller are aligned with the two rollers facing each other.

  In another aspect of the present invention, the groove formed in the tension applying roller in addition to the invention is shifted in position by the two rollers facing each other.

  When the paper is bitten by the cutter, the paper has no tension and is kept taut, that is, a tensioned state is maintained, so the noise caused by the paper flapping that occurs when the paper is bitten by the cutter Can be prevented.

  Also, even if the curled paper is about to rotate and wind with the tensioning roller, the paper that is about to be wrapped by the paper discharge claw that is located in the groove of the roller is peeled off from the roller. It is taken out and it is prevented that it winds around a roller as it is.

An embodiment of the shredder of the present invention will be described.
Two rollers are opposed to each other in parallel with the cutter on the front side of the cutter, which is configured so that the two cutting blades face each other and rotate in the opposite direction in the traveling direction of the shredded paper. A tension applying roller configured to rotate is disposed. Then, the shredding paper feed speed of the tension applying roller is made slower than the shredding paper cutting speed of the cutter.

  By making the paper feeding speed of the tension applying roller slower than the paper cutting speed of the cutter, the shredded paper advances to the cutter while being pulled from the roller side, that is, in a tensioned state. Further, by arranging the cutter and the tension applying roller in parallel, the shredded paper advances on the same plane without being twisted. Therefore, since the shredded paper does not flutter between the roller and the cutter, it is possible to prevent the occurrence of noise due to flapping. Further, since the shredded paper moves while being uniformly pressed by the roller, the shredded paper does not flutter at the roller entrance, and no noise is generated before the roller is inserted.

  Preferably, the shredded paper feed speed of the tension applying roller is 50% to 95% of the shredded paper cutting speed of the cutter. One purpose of rotating the tension applying roller is to feed shredded paper to the cutter. In addition, after the shredded paper is bitten by the cutter, the shredded paper will move due to the rotation of the cutter, but if the tensioning roller does not rotate at this time, the tension applied to the shredded paper will become stronger. This is because there is a risk of passing.

  The shredded paper inserted into the cutter needs to move while being pulled by the tension applying roller. If the speed difference between the two is too small, sufficient tension cannot be applied to the shredded paper. If the speed difference between the two is too large, there is a disadvantage that the shredded paper is damaged when the shredded paper is small or thin. The speed difference may be appropriately selected depending on the number of shredded sheets to be shredded at once and the size of shredded paper. In general, the speed difference between the two may be about 10% to 30%.

  Preferably, the distance between the cutter and the tension applying roller is 10 mm to 50 mm at a position where the outer peripheral surfaces are closest to each other.

  This distance is necessary to give a moderate tension to the shredded paper to the cutter. If the length is too long, sufficient tension cannot be maintained for the shredded paper. In addition, the time from when the shredded paper is no longer sandwiched between rollers until it reaches the cutter becomes too long, and the generation time of the flapping noise that cannot be avoided during this time becomes too long. On the other hand, if the length is shorter than this, the shredded paper does not flutter, but the amount of deformation of the shredded paper between the roller and the cutter becomes too large, and the sound generated when the cutter bites the shredded paper and shreds it. As a result, it does not contribute to the overall noise prevention. In addition, although this distance changes with diameters of a cutter or a roller, and the number of shredded pieces, about 30 mm to 45 mm is usually appropriate.

  Preferably, the tension applying roller is composed of a driving roller and a driven roller, and the gap between the driving roller and the driven roller is variable. The driven roller is urged in a direction in contact with the driving roller, and a stopper is provided so that the driven roller does not open beyond a certain distance.

  This is so that the shredded paper can be held between the driving roller and the driven roller regardless of the number of sheets, and the shredded paper is always kept in tension with respect to the cutter. Further, by preventing the paper from being opened for a certain distance or more, it is possible to prevent the cutting of more than the rated number of shredded sheets into the cutter. In addition, there is an effect of preventing erroneous insertion of foreign matter.

  Preferably, a groove is formed in the rotation direction at an appropriate interval in the tension applying roller, and a paper discharge claw is disposed between the tension applying roller and the cutter so that the tip is located in the groove.

  This is to prevent the shredded paper from being wound around the tension applying roller. The leading edge of the paper ejection nail is positioned in the groove of the roller, so that if the shredded paper is wrapped around the roller and rotates, the shredded paper is forcibly removed from the roller. And the shredded paper is prevented from being wound around the roller.

  Preferably, a groove is formed in the rotation direction at an appropriate interval on the tension applying roller, and a paper guide is provided between the cutter and the tension applying roller, and the leading end of the paper guide is located in the groove as a paper discharge claw. Provide a functioning rib.

  A rib is formed on the paper guide, and the rib functions as a paper discharge claw by positioning the tip of the rib in the groove of the roller. Further, the shredded paper is smoothly fed to the cutter due to the presence of the paper guide.

  Further, preferably, the groove portions formed in the tension applying roller are matched in position by the two rollers facing each other.

  By matching the positions of the grooves of the two rollers facing each other, the shredded paper can be easily deformed at the position of the grooves, so that it is easy to peel off the wrapped paper from the rollers with the paper discharge nail. Become.

  Preferably, the groove formed on the tension applying roller is shifted in position by the two rollers facing each other.

  By shifting the positions of the two rollers facing each other, at least one side of the shredded paper is always in contact with the roller, and it becomes easy to apply a uniform tension to the whole shredded paper.

  Next, an embodiment of the shredder of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the shredding mechanism portion of the shredder of the present invention, and FIG. 2 is a perspective view of the cutter case and the drive gear of FIG. 3 is an enlarged perspective view of the front end shaft case of FIG. 1, and FIG. 4 is an enlarged perspective view of the rear end shaft case of FIG.

  The cutter 1 is composed of two chopping blades 1a and 1b arranged to face each other, and is attached to the rotating shaft of the chopping blade 1a through several reduction gears by a drive motor 2 as shown in FIG. The driving gear 3 causes the chopping blade 1a and the chopping blade 1b to rotate in opposite directions. Further, the cutter 1 is usually covered with a cutter case C as shown in FIG. The shredding blades 1a and 1b are not particularly limited in size and structure, and can be used as long as they are normally used for shredders. The shredding width and shredding length are arbitrary. Can be selected.

  As shown in FIG. 2, a tension applying roller disposed above the cutter 1 (on the front side of the cutter 1 in the traveling direction of the shredded paper P indicated by an arrow in FIG. 2) with two rollers facing each other. 4 is arranged in parallel with the cutter 1. That is, the tension applying roller 4 is parallel to the cutter 1 because the direction in which the shredded paper P passes through the tension applying roller 4 and the direction in which the shredded paper P passes through the cutter 1 are not twisted. It means that both are arranged so as to be on the same plane.

  The tension applying roller 4 is formed of, for example, ethylene / propylene rubber (EPDM), but other materials can be used as long as they have some elasticity. However, too soft ones are not suitable because sufficient tension cannot be held on the shredded paper P. The tension applying roller 4 of the present invention is not intended to simply close the gap like a sound absorbing material, but is intended to hold the shredded paper P at a certain pressure or higher, so it is soft like a sponge. The object having the large deformation ability cannot achieve the object of the present invention.

  The tension applying roller 4 includes a driving pulley 5 attached coaxially to the driving gear 3 on the rotating shaft of one of the chopping blades 1 a of the cutter 1 and a driven pulley 7 attached to the driving roller 6 of the tension applying roller 4. It is driven by a round belt 8 wound between them. In the illustrated example, the diameter of the driven pulley 7 is smaller than that of the driving pulley 5, but the diameter of the tension applying roller 4 is smaller than the diameter of the cutter 1, resulting in shredding by the tension applying roller 4. The moving speed of the paper P is made slower than the shredding speed (moving speed) by the cutter 1.

  The tension applying roller 4 is not driven by a gear but by the round belt 8 so that the tension on the shredded paper P is automatically automatically set between the cutter 1 and the tension applying roller 4 when the round belt 8 slips appropriately. This is so that it can be added while adjusting. If an excessive force is applied to the tension applying roller 4, the rotation of the driving roller 6 is stopped by the slippage of the round belt 8 without stopping the driving motor 2. Note that a V-belt may be used instead of the round belt 8, but a stepped V-belt is not very suitable in order to secure some slip between the belt and the pulley.

  Further, the distance between the cutter 1 and the tension applying roller 4 is set to about 30 mm to 45 mm at a position where the outer peripheral surfaces are closest to each other. Although it depends on the number of shredded sheets, the optimum value can be found basically by setting between the sum and difference of the diameters of the two. According to an experiment, when the diameter of the cutter 1 is 40 mm and the diameter of the tension applying roller 4 is 20 mm, when 6 sheets of A4 paper are shredded at the same time, this distance is in the range of 50 mm to 60 mm, and the generation of fluttering noise is minimum. It was optimal. Further, since the noise of the shredder is greatest when only one sheet is cut, this distance may be set based on the noise when only one sheet is cut.

  The tension applying roller 4 includes a driving roller 6 and a driven roller 9. The gap between the driving roller 6 and the driven roller 9 is variable. For example, in the illustrated example, the driven roller 9 is variable. The bearing 10 of the driven roller 9 is slidable with respect to the bearing case 11. The driven roller 9 is urged by a spring 12 in a direction in contact with the driving roller 6. Further, the bearing 10 is in contact with a stopper 13 provided in the bearing case 11 so as not to be opened for a certain distance or more.

Next, a specific example of the stopper 13 will be described with reference to FIGS.
FIG. 3 is an enlarged perspective view of the front end shaft case 14 of FIG. The bearing 10 of the driven roller 9 can slide to the left and right in the drawing with respect to the bearing case 11. Further, a spring 12 is stretched between one end of the bearing case 11 and the bearing 10, and the driven roller 9 is urged so as to move toward the driving roller 6. When the bearing 11 moves a certain distance, one end of the bearing 11 comes into contact with a stopper 13 formed on the bearing case 11 so that it does not move any further.

  FIG. 4 is an enlarged perspective view of the rear end shaft case 15 of FIG. The bearing 10 of the driven roller 9 can slide to the left and right in the drawing with respect to the bearing case 11. Further, a spring 12 is stretched between one end of the bearing case 11 and the bearing 10, and the driven roller 9 is urged so as to move toward the driving roller 6. A push screw 16 whose length can be adjusted in the sliding direction of the bearing 10 is attached to the bearing case 11 toward the bearing 10, and comes into contact with a stopper 13 formed by projecting from the bearing case 11. Yes. The moving range of the driven roller 9 can be adjusted by adjusting the length of the push screw 16.

  In addition, as for the force which presses the driven roller 9 to the drive roller 6 side with the spring 12, it is desirable to press with the load of about 300-600g per side. If it is weaker than 300 g, the shredded paper cannot be reliably held, causing fluttering, and the effect of preventing noise becomes low. On the other hand, if it is stronger than 600 g, the shredded paper is pinched without being completely slipped by both rollers, and the slip of the round belt 8 becomes excessive. Depending on the number of pieces to be shredded and the length of the roller, about 500 g per side tends to be the optimum value.

  In the above description, only the shredding mechanism portion of the shredder has been described, but an inlet for the shredded paper P is provided on the front side of the tension applying roller 4 in the traveling direction of the shredded paper P. In addition, a dust case is provided at the tip of the cutter for storing shredded paper. These are the same as the conventional shredder. Alternatively, the shredded paper P may be inserted directly into the tension applying roller 4 without providing the shredded paper P slot.

Next, the effect | action of the shredder of a present Example is demonstrated.
The shredder is turned on, the drive motor 2 is rotated, and the cutter 1 and the tension applying roller 4 are rotated. Since the diameter of the tension applying roller 4 is smaller than the diameter of the cutter 1, the moving speed of the shredded paper P by the tension applying roller 4 is slower than the shredding speed (moving speed) by the cutter 1.

  In this state, when the shredded paper P is inserted from a shredder insertion port (not shown), when the leading end of the shredded paper P reaches the tension applying roller 4, the shredded paper P is directed toward the cutter 1 by the rotational force of the tension applying roller 4. Moved. When the leading edge of the shredded paper P reaches the cutter 1, the shredded paper P falls into a dust case (not shown) while being shredded so as to be bitten by the cutter 1.

  In the chopping process by the cutter 1, the chopped paper P from the tension applying roller 4 toward the cutter 1 has a slower moving speed by the tension applying roller 4 than the chopping speed by the cutter 1. P is moved by the cutter 1 while being pulled by the tension applying roller 4. That is, tension is always applied to the shredded paper P. Therefore, when the shredded paper P is bitten into the cutter 1, the shredded paper P does not flutter, and the occurrence of flapping noise can be prevented.

  Further, since the gap between the driving roller 6 and the driven roller 9 is variable and the driven roller 9 is biased by the spring 12 in the direction of the driving roller 6, even when the number of shredded sheets P is changed. The shredded paper P inserted into the tension applying roller 4 can be clamped by an appropriate pressure, and therefore, a desired tension can be applied to the shredded paper P when shredding by the cutter 1.

  Further, since the driven roller 9 is not opened more than a certain distance from the driving roller 6 by the stopper 13, the shredded paper P exceeding the rated number is not inserted into the cutter 1. Further, since the driven roller 9 is driven by the round belt 8, when an excessive force is applied to the driving roller 9, the driving roller 9 is stopped by slipping the round belt 8, and safety is ensured.

Next, another embodiment of the shredder of the present invention will be described with reference to FIGS. FIG. 5 is a perspective view of the shredding mechanism portion of the shredder of the present invention, and FIG. 6 is a perspective view of a state where the tension applying roller of FIG. 5 is removed. 7 is a perspective view taken along line AA in FIG. 5, and FIG. 8 is a cross-sectional view taken along line AA in FIG.
In this embodiment, a groove portion is formed on the tension applying roller 4 and is basically the same as that of the first embodiment, and therefore only different portions will be described.

  The tension applying roller 4 is formed with grooves 17 in the rotational direction at appropriate intervals. The size and spacing of the groove portions 17 cannot be generally determined depending on the material, number of sheets, and paper width of the shredded paper P to be shredded, but for example, a receipt commonly used in supermarkets or convenience stores is shredded. In this case, the width of the groove portion 17 is 5 mm, and the width of the roller portion 18 sandwiched between the adjacent groove portions 17 is 20 mm. That is, it is sufficient that any part of the shredded paper P is positioned in the groove portion 17 at the time of shredding. The positions of the groove portions 17 formed in the two opposing rollers 6 and 9 may coincide with each other as shown in the figure, or may be shifted.

  A paper guide 19 is provided between the tension applying roller 4 and the cutter 1. 7 and 8, the lower end of the paper guide 19 faces the cutter 1, and the upper end of the paper guide 19 surrounds the tension applying roller 4, so that the shredded paper P is smoothly directed toward the cutter 1. It is formed diagonally so as to advance. A rib (paper discharge claw) 20 is formed on the paper guide 19. The rib 20 functions as a paper discharge claw, and the tip 21 thereof is positioned in the groove portion 17. When the paper guide 19 is formed of plastic, the rib 20 can be integrally formed at the same time. The width (thickness) of the rib 20 should be smaller than the width of the groove portion 17, but in order to function as a paper discharge claw, for example, a width of 1 mm is sufficient.

Next, the effect | action of the shredder of a present Example is demonstrated. Since it is basically the same as that of the first embodiment, only the differences will be described.
The shredder is turned on, the drive motor 2 is rotated, and the cutter 1 and the tension applying roller 4 are rotated.
In this state, when the shredded paper P is inserted from a shredder insertion port (not shown), when the leading end of the shredded paper P reaches the tension applying roller 4, the shredded paper P is directed toward the cutter 1 by the rotational force of the tension applying roller 4. Moved.

  If curled shredded paper P (with curled wrinkles) is inserted, shredded paper P is wound around one tension applying roller 4 as shown by a one-dot chain line as shown in FIG. However, since the groove portion 17 is formed on the tension applying roller 4 and the rib 20 is formed on the paper guide 19 so that the leading end 21 is located in the groove portion 17, the shredded paper P is applied with tension. Even if the roller 4 is wound around and rotated, the shredded paper P is forcibly peeled off from the tension applying roller 4 by the rib (paper discharge claw) 20. The shredded paper P peeled off from the tension applying roller 4 moves in the direction of the cutter 1 along the paper guide 19, and when the leading end of the shredded paper P reaches the cutter 1, the shredded paper P bites the cutter 1. It falls into a dust case (not shown) while being shredded.

  In the illustrated embodiment, the paper discharge claw 20 is formed integrally with the paper guide 19 in a rib shape. However, the paper discharge claw 20 has at least a tip 21 located in the groove portion 17 and is tensioned. If it functions so as to peel off the shredded paper P that is wound around the application roller 4 and rotates from the tension application roller 4, its shape, material, and arrangement position can be selected as appropriate. Further, the position where the tip 21 of the paper discharge claw 20 is disposed with respect to the groove portion 17 of the tension applying roller 4 is such that the shredded paper P peeled off from the tension applying roller 4 advances smoothly to the cutter 1. In order to do so, it is desirable to provide between the contact portion of the two tension applying rollers 4 and the portion where the tension applying roller 4 is closest to the cutter 1.

  The shredder of the present invention only needs to be shredded by a cutter having two shredded blades facing each other, and there is no limitation on the size of the shredder, which can be large or small. In addition, regardless of whether the paper is advanced in the vertical direction or in the horizontal direction, tension can be applied to the shredded paper in either direction, and the applicable range is extremely wide.

  In addition, since the shredded paper that is wound around the tensioning roller and rotates can be forcibly separated from the roller, it can be used as it is even if the shredded paper is curled, and further by appropriately selecting the interval between the grooves. It can be widely applied to shredded paper of various widths.

It is a perspective view of the shredding mechanism part of the shredder of this invention. It is a perspective view in the state where the cutter case and drive gear of Drawing 1 were removed. It is an expansion perspective view of the front end shaft case of FIG. It is an expansion perspective view of the rear-end shaft case of FIG. It is a perspective view which shows the other example of the shredding mechanism part of the shredder of this invention. It is a perspective view of the state which removed the tension | tensile_strength provision roller of FIG. It is a perspective view of the AA line of FIG. It is sectional drawing of the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter 1a, 1b Shred blade 2 Drive motor 3 Reduction gear 4 Tension applying roller 5 Drive pulley 6 Drive roller 7 Driven pulley 8 Round belt 9 Driven roller 10 Bearing 11 Bearing case 12 Spring 13 Stopper 14 Front end shaft case 15 Rear end Shaft case 16 Press screw 17 Groove part 18 Roller part 19 Paper guide 20 Rib (Paper discharge claw)
21 Tip P Shredded paper C Cutter case

Claims (8)

  Two rollers are opposed to each other in parallel with the cutter on the front side of the cutter, which is configured so that the two cutting blades face each other and rotate in the opposite direction in the traveling direction of the shredded paper. A shredder characterized in that a tensioning roller configured to rotate is disposed and the shredded paper feed speed of the tensioning roller is slower than the shredded paper cutting speed of the cutter.   The shredder according to claim 1, wherein a shredding paper feed speed of the tension applying roller is 50% to 95% of a shredding paper cutting speed of the cutter.   The shredder according to claim 1 or 2, wherein the distance between the cutter and the tension applying roller is 10 mm to 50 mm at a position where the outer peripheral surfaces are closest to each other.   The tension applying roller is composed of a driving roller and a driven roller, the gap between the driving roller and the driven roller is variable, the driven roller is urged in a direction in contact with the driving roller, and does not open for a certain distance or more. The shredder according to claim 1, further comprising a stopper.   2. A groove portion is formed in the rotation direction at an appropriate interval in the tension applying roller, and a paper discharge claw is disposed between the tension applying roller and the cutter so that a tip of the paper discharge nail is located in the groove portion. The shredder in any one of thru | or 4.   The groove portion is formed in the rotation direction at an appropriate interval on the tension applying roller, and a paper guide is provided between the tension applying roller and the cutter, and the paper guide is positioned at the tip thereof in the groove portion to discharge the paper. The shredder according to any one of claims 1 to 5, wherein a rib functioning as a claw is provided.   The shredder according to claim 5 or 6, wherein the groove portion formed in the tension applying roller has the same position between the two rollers facing each other.   The shredder according to claim 5 or 6, wherein the groove formed on the tension applying roller is displaced in position by the two rollers facing each other.

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