JP2005271175A - Paper cutter including paper chip dropping cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper cutter for cutting paper sheets stacked in layers on a table, naturally dropping the paper chips cut by a cutter without their being caught in the cutter. <P>SOLUTION: This paper cutter has a paper presser 2 descending from the upper side along a guide, and a cutter 3 obliquely raised from the lower side, wherein the cutter 3 is provided with a paper chip dropping cover 24 connected to the knife surface 27 at the tip. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper cutting device to which a paper waste dropping cover is attached so that the cut paper waste does not adhere to a cutter or the like when cutting a plurality of stacked papers. Here, the paper waste is intended for paper pieces and paper dust generated when cutting paper.

  There are various cutting apparatuses for cutting a plurality of stacked sheets of paper at once, but they are generally large and large apparatuses. For example, the paper presser can be lowered and clamped so as not to misalign 1000 sheets or more of sheets, and can be cut by a cutter that descends from above. The paper presser and the cutter are hydraulically driven, and cut paper by exerting a force of several tons. Of course, there is a cutting device that uses a motor instead of a hydraulic drive system, but generally a motor of several hundred to several thousand W is used with an AC power supply.

  Therefore, the conventional paper cutting device is large in size and weight, and therefore cannot be built in as an accessory device of an office machine. Moreover, since the stroke of the cutter is fixed in the conventional paper cutting apparatus, the stroke is the same regardless of whether the number of sheets to be stacked is large or small. When cutting a small number of sheets, the movement of the cutter is wasted. And the efficiency of the cutting operation decreases accordingly.

  Also, when cutting the paper by lowering the cutter from above as in “Paper Cutting Device” according to Japanese Patent Application Laid-Open No. 2003-191196, the paper scraps rub against the blade edge surface and static electricity is generated, and the blade edge is cut. Waste paper scraps will adhere and must be removed. In other words, since the paper dust cannot be completely dropped by the cutter descending from above, a method of forcibly removing it by sending wind or rubbing with a brush is employed. By providing such an auxiliary function for removing paper waste, the entire cutting apparatus becomes large, and it is far from the compact paper cutting apparatus required by the present invention.

  Therefore, by cutting the stacked paper one by one from the lower side by placing the cutter on the lower side and pushing it upward, the generated paper waste can naturally fall by the action of gravity. That is, since it does not adhere to the cutter, cutting efficiency is good, and it is not necessary to provide an apparatus necessary for forcibly removing paper waste.

  Therefore, the applicant has filed a patent application (Patent Application No. 2003-426958) for “Paper Cutting Device” as of December 24, 2003. In the paper cutting device for cutting the placed paper, it has a paper presser that descends from above along the guide, and has a cutter blade that rises from below, and the paper presser mechanism of the paper presser is A nut is screwed onto a screw that is rotated by a motor, and a paper presser is connected via the nut and a link. The cutter blade is attached to a guide having an inclined guide groove, and the slider protruding from the cutter blade is The slider fits in the guide groove and is slidable in the direction along the guide groove. Further, stopper pieces are attached to both sides of the paper retainer, and another stopper piece is also attached to both sides of the cutter base. And, the cutter blade moves up the paper cutting apparatus, characterized in that both stopper piece was made to contact with each other at a predetermined position. "A.

That is, it is possible to press the paper with a paper presser provided at the upper side and sequentially cut from the lower side with a cutter rising from the lower side. The fine paper scraps that have been cut naturally fall, but sometimes the paper is caught by a gap between the cutter and the guide, a screw head that fixes the replacement blade, a protruding slider, and the like, thereby preventing the fall. As a result, the cutting work is hindered and the work efficiency is lowered. In particular, paper dust generated during cutting enters a small gap or enters a sliding surface, causing trouble.
"Paper cutting apparatus" according to Japanese Patent Application Laid-Open No. 2003-191196 "Paper cutting device" according to Japanese Patent Application No. 2003-426958

  Thus, the conventional paper cutting apparatus has the above-described problems. The problem to be solved by the present invention is this problem, which is very compact and can be driven by a small motor with low power consumption, and the paper waste (paper pieces and paper dust) to be cut is not caught and is naturally caught. Provided is a paper cutting device provided with a paper dust drop cover that can be dropped.

  The paper cutting device according to the present invention has a paper presser that holds a plurality of stacked papers so as not to be misaligned, and the cutter is provided below the paper presser and can be raised obliquely upward. That is, a plurality of sheets arranged on the table are pressed by a sheet press so as not to be misaligned, and are cut by a cutter that rises in this state. Paper is cut one by one from the bottom, and most of the paper scraps fall naturally and do not adhere to the blade edge.

  Generally, when a material to be cut is cut with a blade, the word “sharpness” is often used to express the cutting performance of the blade. This sharpness is judged by the magnitude of the force applied to the blade during cutting (cutting resistance), the quality of the cut surface whether or not the cut surface is damaged by cutting streaks, the durability of the blade, etc. .

There are three factors of cutting resistance: geometrical factors (the shape of the blade), mechanical factors (such as the cutting method), and material factors (such as the material of the blade).
The mechanical factor is that the cutting resistance Fa is expressed by two element resistances.
Fa = Fb + Fc.

Fb: Deformation / destruction resistance of the material to be cut,
Fc: Friction resistance between the material to be cut and the cutting tool By the way, the cutting resistance of the cutting device that cuts the material to be cut (sheet bundle, laminated paper, metal foil, thin metal plate layer) piled up many sheets It is recognized that the material fluctuates irregularly due to a change in compression elasticity, which is a deformation amount of the material, and a change in frictional force. In order to drive such a cutting device with a drive motor or the like, it is necessary to set the driving force of the drive motor or the like based on the maximum cutting resistance and also set the rigidity of the cutting device itself based on the maximum cutting resistance. is there.

  In the cutting apparatus according to the present invention, the cutter that cuts the plurality of stacked paper sheets is moved along the inclined guide groove so that the cutter is tilted in the longitudinal direction of the cutters. Cut the paper one by one to remove small pieces of paper and paper dust, which are generated paper scraps, from entering the gap between the cutter and guide, etc. A cover is installed.

  Although the specific form of the said paper waste drop cover is not limited, at least the upper end is inclined or curved along the cutter blade surface. And this paper waste drop cover is provided over the substantially full length of the cutter, and it is attached to the upper end part of a cutter, and can move up and down with a cutter. However, as a method for attaching the paper waste dropping cover, it is screwed or bonded, but other methods may be used.

  The paper cutting device according to the present invention is configured to clamp the stacked paper by a paper presser and cut it by a cutter that rises obliquely upward from below. Since the cutter is pushed upward obliquely, it is possible to cut the paper one by one from the lower side, and the cut paper waste falls naturally and hardly adheres to the blade edge of the cutter.

  In addition, in the present invention, the paper waste drop cover is attached leaving the blade edge of the cutter, and the cut paper waste slides along the paper waste drop cover. Therefore, the paper dust does not enter the gap between the cutter and the guide, and the paper piece is not caught by the screw head for fixing the replacement blade, the protruding slider, etc., and the cutting operation can be performed efficiently. Of course, there is no trouble with the cutting device due to the paper waste.

  1 to 3 show an embodiment of a paper cutting device according to the present invention. FIG. 1 is a front view, FIG. 2 is a left side enlarged view, and FIG. 3 is a right side enlarged view. In FIG. 1, reference numeral 1 denotes a plurality of stacked paper sheets 1, 2 a paper presser that holds the paper 1 so that the paper 1 is not misaligned, and 3 a cutter for cutting the paper 1. The stacked paper 1 is placed on a flat table 4, and the paper presser 2 is lowered from above, and is firmly clamped by the paper presser 2 so as not to be displaced when the paper 1 is cut.

  The paper retainer 2 is a member having a U-shaped cross section and hits over the entire width of the paper. The paper retainer 2 is connected by links 5a and 5b provided at equal distances from the neutral shaft. The links 5a, 5b are connected to sliders 8a, 8b sandwiching nuts 7a, 7b screwed to the screws 6a, 6b via shafts 9a, 9b. If the screw 6 rotates, the interval between the nuts 7a and 7b screwed to the screw 6 increases or decreases, and as a result, the link 5a connected to the paper retainer 2 via the shafts 9a, 9b, 10a and 10b. , 5b change.

  In FIG. 1, if the distance between the sliders 8a and 8b sandwiching the nuts 7a and 7b is reduced, the paper presser 2 is lowered and presses the stacked paper 1. Since the paper presser 2 is guided, it does not move in the left-right direction, and the paper presser 2 moves up and down by the movement of the sliders 8a and 8b accompanying the rotation of the screws 6a and 6b. The screws 6a and 6b provided on a part of the shaft are driven to rotate by a motor 11, and a belt and a plurality of gears are interposed between them as shown in FIG. I can do it. The paper presser 2 is biased downward by the coil springs 12, 12,... And the links 5a and 5b stand up, so that the coil springs are extended and the paper presser 2 is lowered.

  In the present invention, since the paper presser is a combination of a gear mechanism and a link mechanism, the paper 1 can be strongly clamped even when a motor equivalent to 25 W is used with a DC 24 V power source, for example. Then, by detecting the position of the slider 8a, the inclination θ of the links 5a and 5b can be found, and as a result, the thickness of the paper 1 being pressed by the paper press 2 can be known. Can be controlled without waste. Limit switches 13a and 13b for detecting the position of the slider 8a are attached to this device, and the positions of the limit switches 13a and 13b can be changed.

  On the other hand, the cutter 3 is mounted on the lower side of the paper presser 2 in a state of being in contact with the cutter table 14, and can be fitted between the guides 15a and 15b to slide. Moreover, the slide direction of the cutter 3 is obliquely up and down, and two guide grooves 16a and 16b are formed in the guides 15a and 15b at a predetermined distance, respectively, and the guide grooves 16a and 16b are obliquely formed. Inclined.

  Sliders 18a and 18b are attached to shaft pins 17a and 17b penetrating the cutter 3 and the cutter base 14, and the sliders 18a and 18b are fitted in the guide grooves 16a and 16b. Therefore, if the sliders 18a and 18b move along the guide grooves 16a and 16b, the cutter 3 can slide in an oblique direction. However, the cutter 3 can always be kept horizontal by moving the sliders 18a and 18b fitted in the guide grooves 16a and 16b formed in parallel. When the sliders 18a and 18b are at the right ends of the inclined guide grooves 16a and 16b, the cutter 3 is lowered. However, when the sliders 18a and 18b slide and move to the left, the cutter 3 rises.

  On the other hand, the cutter base 14 in contact with the cutter 3 is provided with a long hole extending horizontally, and the shaft pins 17a and 17b are fitted in the long hole. Therefore, when the sliders 18a and 18b move in the oblique direction along the guide grooves 16a and 16b, the cutter 3 moves in the oblique direction along the guide grooves 16a and 16b, but the cutter table 14 moves up and down. .

  By the way, in this invention, the specific means for raising / lowering the cutter 3 and the cutter stand 14 is not limited. For example, in the case of the embodiment shown in the figure, the left end of the cutter 3 is connected to the horizontal slider 19. A vertical guide groove 20 is formed in the horizontal slider 19, and a slider 21 attached to the cutter side end is loosely fitted in the vertical guide groove 20.

  The horizontal slider 19 is guided by two parallel horizontal guide screws 22, 22, and the horizontal slider 19 can move horizontally by rotating both guide screws 22, 22 at the same speed. The cutter 3 is pulled or pressed by the horizontal slider 19, and as a result, the cutter table 14 can move up and down in an oblique direction along the guide grooves 16a and 16b, and the cutter table 14 can move up and down. The movement of the horizontal slider 19 is driven by a motor 23 via a plurality of gears.

  By the way, in the paper cutting device of the present invention, a paper waste dropping cover 24 is attached to the cutter 3. Here, the paper waste means not only small paper pieces generated during the cutting operation but also fine paper dust. As shown in FIG. 4, a concrete example of the paper scrap drop cover 24 is produced by bending a plastic or a thin metal plate, and is formed with a smooth curved surface as a whole, and its upper end 25 is curved. ing. Alternatively, it is possible to use a thin and soft sheet instead of a shaped molded product.

  FIG. 5 shows a case where the paper waste drop cover 24 is attached to the cutter 3. FIG. 5A is a cross-sectional view taken along the line AA in FIG. 1, FIG. 5B is a detailed view of a portion X in FIG. FIG. 6 is a detailed view of a Y part in FIG. As shown in the figure, the paper dust drop cover 24 is attached to the cutter 3, but the edge of the upper end portion 25 is sandwiched and bonded to the replacement blade 26 of the cutter 3, and below the inclined blade surface 27. The tip portion 25 is located. If a thin and soft sheet is sandwiched between the replacement blade 26 of the cutter 3 and attached, the paper scrap cover 24 is smoothly curved by its own weight.

  Therefore, the cut paper waste can fall from the blade surface 27 to the curved tip portion 25 and slide down along the smooth paper waste drop cover 24. Since the entire front side of the paper scrap removing cover 24 is covered except for the replacement blade 26 of the cutter 3, it is not caught by the set screw of the replacement blade 26, the guide 15a, the guide grooves 16a and 16b, and the sliders 18a and 18b. . Of course, it is possible to prevent paper dust generated during cutting from entering a small gap or sliding portion.

  FIG. 6 shows an embodiment in which another form of paper scrap drop cover 24 is attached to the cutter 3. 1A is a cross-sectional view taken along the line AA of FIG. 1, FIG. 1B is a detailed view of an X portion of FIG. 6A, and FIG. 3C is a detailed view of a Y portion of FIG. As in the case of FIG. 5, the paper scrap drop cover 24 is attached to the cutter 3, but the edge of the upper end portion 25 is bonded to the tip of the cutter 3 and attached along the inclined blade surface 27 of the replacement blade 26. Therefore, the paper waste cut by the cutter 3 can slide down along the paper waste drop cover 24.

  By the way, the sharpness of a cutter is so favorable that the cutting resistance of this cutter and paper is small. There are two types of cutting: “push cutting” in which the cutter is pushed in a direction perpendicular to the edge of the blade edge, and “drawing” in which the cutter is pushed in parallel with the movement of the edge of the blade edge. The present invention employs the latter method that emphasizes “drawing”. Here, the tip angle (wedge angle) γ of the cutter, the speed of pushing in the direction perpendicular to the edge of the blade (pushing speed) V, the cutter The apparent cutter tip angle (effective wedge angle) β is expressed by the following equation according to the speed (horizontal speed) v at which the blade moves parallel to the blade edge.

tan β = V / (V ² + v ² ) ^1/2 · tan γ
As can be seen from this equation, the cutting resistance varies depending on the paper quality and the apparent tip angle (effective wedge angle) β of the cutter, and there exists an optimum wedge angle β corresponding to the paper quality. The paper cutting apparatus according to the present invention controls the optimum pushing speed V and horizontal speed v based on the constraints such as practical dimensions and cutting time by being installed in an office machine in consideration of the above formula. A guide groove and a slider that fits into the guide groove are provided.

The front view of the paper cutting apparatus of this invention. The left view of the paper cutting device of this invention. The right view of the paper cutting device of this invention. A specific example of a paper scrap cover. AA sectional drawing of FIG. AA sectional drawing of FIG.

Explanation of symbols

1 Paper 2 Paper presser 3 Cutter 4 Table 5 Link 6 Screw 7 Nut 8 Slider 9 Axis
10 axes
11 Motor
12 Coil spring
13 Limit switch
14 Cutter base
15 Guide
16 Guide groove
17 axis pin
18 Slider
19 Horizontal slider
20 Vertical guide groove
21 Slider
22 Guide screw
23 Motor
24 Paper scrap cover
25 Top edge
26 spare blade
27 Blade surface

Claims (3)

In a paper cutting device for cutting a plurality of sheets placed on a table, the paper cutting device includes a paper presser that descends from above and a cutter that rises obliquely from below. A paper cutting device provided with a paper dust drop cover, wherein a paper dust drop cover is attached to the tip, and the upper end of the paper dust drop cover is continuous with the blade surface at the tip of the cutter. A paper cutting apparatus for cutting a plurality of sheets placed on a table, having a paper presser that descends from above along a guide, and a cutter that rises diagonally from below The paper presser mechanism of the paper presser is configured by screwing a nut to a screw that is rotated by a motor, and connecting the nut and the paper presser via a link. The cutter is attached to a guide having an inclined guide groove. The slider protruding from the cutter fits in the guide groove, and the slider is slidable in the direction along the guide groove. A paper dust drop cover is attached to the tip of the cutter, and the gap between the cutter and the guide, Cover the screw head that fixes the replacement blade at the tip of the cutter, the protruding slider, etc., and the upper end of the paper scrap drop cover above the blade surface at the tip of the cutter Paper cutting apparatus comprising a paper dust dropping cover is characterized in that so as to continue. The paper cutting device provided with the paper waste drop cover according to claim 1 or 2, wherein the edge of the upper end portion of the paper waste drop cover is attached to the cutter tip.

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