JP5486785B2 - Cutter unit for sheet cutter - Google Patents

Description

  The present invention relates to a cutter unit built in a sheet cutting machine for cutting a sheet, CD or other sheet-like medium.

  An example of a sheet cutting machine is disclosed in Japanese Utility Model Laid-Open No. 5-74642 (Patent Document 1).

  7 is a perspective view of the sheet cutting machine 500 disclosed in the publication, FIG. 8 is a longitudinal sectional view showing the internal structure of the sheet cutting machine 500, and FIG. 9 is a top view of the cutter unit built in the sheet cutting machine 500. It is a top view when it sees from.

  As shown in FIG. 7, the sheet cutting machine 500 includes an upper case 510 and a lower case 520.

  The upper case 510 is placed on the lower case 520.

  A paper inlet 511 is formed on the top surface of the upper case 510, and an operation switch 512 for instructing on / off of the sheet cutting machine 500 is disposed. The cutter unit shown in FIG. 9 is built in the upper case 510.

  The front door 521 of the lower case 520 can be opened and closed, and a waste bag for storing paper waste cut by the cutter unit in the upper case 510 is stored in the lower case 520.

  The cutter unit shown in FIG. 9 includes a first shaft 530, a plurality of first cylindrical rotary blades 531 formed on the first shaft 530 at a constant pitch concentrically with the first shaft 530, and a second And a plurality of second cylindrical rotary blades 541 formed on the second shaft 540 at the same pitch as the first cylindrical rotary blade 531 concentrically with the second shaft 540. Yes.

  The plurality of first cylindrical rotary blades 531 are formed integrally with the first shaft 530, and similarly, the plurality of second cylindrical rotary blades 541 are formed integrally with the second shaft 540. .

  Knurls (hatched areas) for paper feeding are formed over the entire circumferential surface of the plurality of first cylindrical rotary blades 531 and the plurality of second cylindrical rotary blades 541.

  The plurality of first cylindrical rotary blades 531 have the same width (the length in the length direction of the first shaft 530), and between the first cylindrical rotary blades 531 adjacent to each other. A gap 532 having the same width is formed.

  Similarly, the plurality of second cylindrical rotary blades 541 have the same width (the length in the length direction of the second shaft 540), and the second cylindrical rotary blades 541 adjacent to each other. A gap 542 having the same width is formed between them.

  Each of the plurality of second cylindrical rotary blades 541 is engaged with the gap 532 between the plurality of first cylindrical rotary blades 531. Similarly, each of the plurality of first cylindrical rotary blades 531 meshes with a gap 542 between the plurality of second cylindrical rotary blades 541.

  The first shaft 530 and the second shaft 540 are each connected to a motor 550 via a belt 551, and are driven by the motor 550 to rotate in opposite directions. That is, as shown in FIG. 8, the first shaft 530 rotates counterclockwise, and the second shaft 540 rotates clockwise. As described above, the first shaft 530 and the second shaft 540 rotate in opposite directions to each other, so that the plurality of first cylindrical rotary blades 531 formed on the first shaft 530 and the second shaft 530 are formed. The paper that has fallen between the plurality of second cylindrical rotary blades 541 formed on the shaft 540 is caught between the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 and cut. Is done.

  The sheet cutter 500 operates as follows.

  When the paper P is input into the upper case 510 from the input port 511, the paper P is guided to the cutter unit by the two guide plates 561 and 562 disposed inside the upper case 510 as shown in FIG. It is burned.

  Since the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 constituting the cutter unit rotate in opposite directions, the first cylindrical rotary blade 531 and the second cylinder The sheet P that has reached the meshing surface 563 with the shaped rotary blade 541 is wound between the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 and cut.

The cut paper P falls from the upper case 510 to the lower case 520 and is stored in a waste bag disposed inside the lower case 520.
Japanese Utility Model Publication No. 5-74642 (FIGS. 3, 4, and 7)

  In general, the speed at which the sheet cutting machine 500 cuts a sheet is not so high. For this reason, the user may try to increase the cutting processing speed by inserting a large number of sheets into the insertion slot 511 at one time.

  As described above, knurls are formed over the entire outer peripheral surface (circumferential surface) of the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541.

  The knurling improves the frictional resistance of the outer peripheral surfaces (circumferential surfaces) of the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 and ensures that the paper P that has reached the meshing surface 563 is in the first cylindrical shape. It is possible to wind between the rotary blade 531 and the second cylindrical rotary blade 541.

  On the other hand, as a result of the frictional resistance of the outer peripheral surfaces (circumferential surfaces) of the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 being increased by the knurling, a large number of sheets of paper are loaded into the inlet 511 at a time. When the meshing surface 563 is reached via the frictional force between the first and second cylindrical rotary blades 531 and 541, there is a problem that the frictional force between the large number of sheets and the first cylindrical rotary blade 531 becomes too large. .

  That is, if this frictional force exceeds the force that the motor 550 drives the first shaft 530 and the second shaft 540, the first shaft 530 and the second shaft 540 are forcibly stopped by the frictional force. This makes it impossible to perform further sheet cutting processing. In this state, a large number of sheets are left jammed between the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541.

  In such a case, the motor 550 is rotated in the reverse direction, and the jammed paper is fed back between the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541, or the user is jammed. After the paper is pulled out to clear the paper jam, cutting is resumed with a smaller number of sheets.

  As a result, in the conventional sheet cutting machine 500, the number of sheets that can be processed at one time is limited, so the processing speed of sheet cutting cannot be increased, and when cutting a large number of sheets, The current situation is that much time is required for the cutting process.

  Even in the conventional sheet cutting machine 500, it is possible to cut a large number of sheets at a time by using the motor 550 having a large output. However, such a high output motor 550 consumes a large amount of electric power, which is not preferable from the viewpoint of energy saving.

  The present invention has been made in view of the problems in such a conventional sheet cutting machine, and it is possible to shorten the time required for the cutting process by increasing the number of sheets that can be cut at a time. Furthermore, it is an object of the present invention to provide a cutter unit for a sheet cutting machine that can suppress an increase in power consumption even if a large number of sheets are cut at a time.

  Hereinafter, means for solving the above-described problems will be described using reference numerals used in the “Embodiments of the Invention”. These reference signs are added only to clarify the correspondence between the description of “Claims” and the description of “Embodiments of the Invention”. It should not be used to interpret the technical scope of the invention described in.

To achieve the above object, the present invention includes a first shaft, and a plurality of first cylindrical rotary blades formed on the first shaft at a constant pitch concentrically with the first shaft; A plurality of second cylindrical rotary blades formed on the second shaft at the pitch concentrically with the second axis, and the plurality of first cylindrical rotary blades Each of the plurality of second cylindrical rotary blades meshes with a gap between the plurality of second cylindrical rotary blades, and each of the plurality of first cylindrical rotary blades meshes with a gap between the plurality of second cylindrical rotary blades. A cutter unit for a sheet cutter, wherein the first shaft and the second shaft are arranged on circumferential surfaces of the plurality of first cylindrical rotary blades and the plurality of second cylindrical rotary blades. The end portions located on the same side of the plurality of first cylindrical rotary blades and the plurality of second cylindrical rotary blades in the axial direction of In the region having a length shorter than the length in the axial direction of the plurality of first cylindrical rotary blades and the plurality of second cylindrical rotary blades toward the other end, Is provided, and the other end portion is provided with a sharp convex portion in a region that does not conflict with the first concave and convex portions, and a cutter unit for a sheet cutting machine is provided.

  The length (L2) of the region (113) in which the first unevenness (114) is formed has the plurality of first cylindrical rotary blades (111) and the plurality of second cylindrical rotary blades ( 121) is preferably 50% or less and 1% or more of the length in the axial direction.

  The present invention further provides a sheet cutting machine comprising the above-described cutter unit for a sheet cutting machine.

  In the conventional sheet cutting machine 500, the knurls are formed over the entire outer peripheral surface (circumferential surface) of the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541. In the cutting process, the frictional force between the large number of sheets and the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 is too large.

  On the other hand, in the cutter unit according to the present invention, the first unevenness (knurl) is a partial region of the outer peripheral surface (circumferential surface) of the first cylindrical rotary blade or the second cylindrical rotary blade. It is formed only on. Therefore, compared to the cutter unit (FIG. 9) in the conventional sheet cutting machine 500, when a large number of sheets are cut at a time, the large number of sheets, the first cylindrical rotary blade, and the second The frictional force with the cylindrical rotary blade can be greatly reduced. Therefore, as compared with the conventional sheet cutting machine 500, it is possible to cut a larger number of sheets at a time, and it is possible to reduce the time required for the cutting process when a large number of sheets are cut. Become. In the cutter unit according to the present invention, the first unevenness (knurl) sufficiently performs the paper feeding function, so that the paper feeding is not delayed as compared with the conventional sheet cutting machine 500.

  When the inventor conducted a comparative experiment, in the conventional sheet cutting machine 500 shown in FIGS. 7 to 9, a paper jam occurred when trying to cut 50 sheets of paper at once. In the sheet cutting machine incorporating the cutter unit according to the present invention, it was possible to cut a maximum of 62 sheets at a time.

  Furthermore, according to the cutter unit of the present invention, it is possible to increase the number of sheets that can be cut at a time without using a high-output motor, that is, without increasing power consumption. It is.

(First embodiment)
FIG. 1 is a plan view of the cutter unit 100 for a sheet cutter according to the first embodiment of the present invention as viewed from above.

  The cutter unit 100 according to the present embodiment includes a first shaft 110 and a plurality of first cylindrical rotary blades 111 formed on the first shaft 110 at a constant pitch concentrically with the first shaft 110, The second shaft 120 and a plurality of second cylindrical rotary blades 121 formed on the second shaft 120 at the same pitch as the first cylindrical rotary blade 111 concentrically with the second shaft 120. Has been.

  The plurality of first cylindrical rotary blades 111 are formed integrally with the first shaft 110, and similarly, the plurality of second cylindrical rotary blades 121 are formed integrally with the second shaft 120. .

  The plurality of first cylindrical rotary blades 111 have the same width (the length in the length direction of the first shaft 110), and between the first cylindrical rotary blades 111 adjacent to each other, A gap 112 having the same width is formed.

  Similarly, the plurality of second cylindrical rotary blades 121 have the same width as the first cylindrical rotary blade 111 (the length in the length direction of the second shaft 120) and are adjacent to each other. A gap 122 having the same width is formed between the second cylindrical rotary blades 121.

  Each of the plurality of second cylindrical rotary blades 121 meshes with a gap 112 formed between the plurality of first cylindrical rotary blades 111. Similarly, each of the plurality of first cylindrical rotary blades 111 is engaged with a gap 122 formed between the plurality of second cylindrical rotary blades 121.

  FIG. 2 is an enlarged plan view showing only one of the first cylindrical rotary blades 111. 2 illustrates the first cylindrical rotary blade 111, the second cylindrical rotary blade 121 also has the same structure as the first cylindrical rotary blade 111. FIG.

  As shown in FIG. 1 or 2, the first cylindrical rotary blade 111 has an outer peripheral surface (circumferential surface) on the outer circumferential surface (circumferential surface) in the axial direction of the first shaft 110 and the second shaft 120. In the region 113 having a length L2 shorter than the length L1 in the axial direction of the first cylindrical rotary blade 111, starting from the end portion 111a located on the same side of the blade 111 toward the other end portion 111b. First irregularities (knurls) 114 are formed.

  The first unevenness 114 extends in the axial direction of the first shaft 110 and the second shaft 120 and has a peak portion having a first height in the radial direction of the first shaft 110 and the second shaft 120. And a trough that extends in the axial direction of the first shaft 110 and the second shaft 120 and has a second height in the radial direction of the first shaft 110 and the second shaft 120. ing.

  The first height of the peak is greater than the second height of the valley, and the peaks and valleys are alternately formed.

  In the present embodiment, the length L2 of the region 113 where the first unevenness (knurl) 114 is formed is set to be equal to 20% of the length L1 in the axial direction of the first cylindrical rotary blade 111. Has been.

  When incorporating the cutter unit 100 according to the present embodiment into a sheet cutting machine, for example, the cutter unit 100 according to the present embodiment can be incorporated into the sheet cutting machine 500 instead of the cutter unit shown in FIG.

  The sheet cutting machine incorporating the cutter unit 100 according to this embodiment performs the same cutting operation as the sheet cutting machine 500 shown in FIGS.

  By using the cutter unit 100 according to the present embodiment, the following effects can be obtained.

  In the conventional sheet cutting machine 500, since the unevenness (knurl) is formed over the entire outer peripheral surface (circumferential surface) of the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541, a large number of sheets When the sheets are cut at a time, the frictional force between the large number of sheets and the first cylindrical rotary blade 531 and the second cylindrical rotary blade 541 is too large.

  On the other hand, in the cutter unit 100 according to the present embodiment, the first unevenness (knurl) 114 is the outer peripheral surface (circumferential surface) of the first cylindrical rotary blade 111 or the second cylindrical rotary blade 121. It is formed only in a part of the region 113.

  Therefore, compared to the cutter unit (FIG. 9) in the conventional sheet cutting machine 500, when a large number of sheets are cut at a time, the large number of sheets, the first cylindrical rotary blade 111, and the second The frictional force with the cylindrical rotary blade 121 can be significantly reduced. Therefore, as compared with the conventional sheet cutting machine 500, it is possible to cut a larger number of sheets at a time, and it is possible to reduce the time required for the cutting process when a large number of sheets are cut. Become.

  In addition, in the cutter unit 100 according to the present embodiment, the first unevenness (knurl) 114 sufficiently performs the paper feeding function, so that paper feeding is delayed as compared with the conventional sheet cutting machine 500. Absent.

  When the present inventor conducted a comparative experiment, in the conventional sheet cutting machine 500 shown in FIGS. 7 to 9, a paper jam occurred when trying to cut 50 sheets at a time.

  On the other hand, in the sheet cutting machine incorporating the cutter unit 100 according to the present embodiment, it was possible to cut a maximum of 62 sheets at a time. From this, it has been found that by using the cutter unit 100 according to the present embodiment, the number of sheets that can be cut at a time can be improved by at least 20%.

  Even in the conventional sheet cutting machine 500, if the output of the motor 550 is increased, it is possible to cut a large number of sheets at a time, but the use of the high output motor 550 increases the power consumption. Is inevitable.

  On the other hand, according to the cutter unit 100 according to the present embodiment, the number of sheets that can be cut at a time without using a high-output motor, that is, without increasing power consumption, is obtained. It can be enlarged.

  The inventor has a sheet cutting machine S (with the exception of using the cutter unit 100 except that the conventional sheet cutting machine 500 shown in FIGS. 7 to 9 and the cutter unit 100 according to this embodiment are incorporated). 1 to 60 sheets of paper, and the current consumption (unit: amperes) and power consumption (unit: watts) for each of them are cut. Was measured.

  The measurement results are shown in Table 1.

  As is clear from Table 1, the sheet cutting machine S incorporating the cutter unit 100 according to this embodiment can cut 50 sheets or more at a time as compared with the conventional sheet cutting machine 500. Not only is this possible, current consumption and power consumption can be substantially reduced regardless of the number of sheets to be cut. In particular, when cutting 40 sheets or more at a time, the sheet cutter S incorporating the cutter unit 100 according to the present embodiment significantly reduces the current consumption and power consumption compared to the conventional sheet cutter 500. It is possible to make it.

  Note that the structure of the cutter unit 100 according to the present embodiment is not limited to the above structure, and various modifications can be made.

  In the cutter unit 100 according to the present embodiment, the length of the region 113 where the first unevenness (knurl) 114 is formed is the axial direction of the first cylindrical rotary blade 111 or the second cylindrical rotary blade 121. Although it is set to be equal to 20% of the length at, the ratio is not limited to 20%. According to experiments conducted by the present inventors, the length of the region 113 where the first unevenness (knurl) 114 is formed is the axial direction of the first cylindrical rotary blade 111 or the second cylindrical rotary blade 121. If it is 50% or less of the length in, the effect equivalent to the cutter unit 100 which concerns on this embodiment can be acquired. In addition, the effective minimum length of the area | region 113 which forms the 1st unevenness | corrugation (knurl) 114 was 1% of the length in the axial direction of the 1st cylindrical rotary blade 111 or the 2nd cylindrical rotary blade 121. .

(Second embodiment)
FIG. 3 is a plan view of a cylindrical rotary blade 111A used in the cutter unit according to the second embodiment of the present invention.

  In the cutter unit according to this embodiment, instead of the first cylindrical rotary blade 111 and the second cylindrical rotary blade 121 in the cutter unit 100 according to the first embodiment, a cylindrical rotary blade shown in FIG. 111A is used.

  As shown in FIG. 3, the cylindrical rotary blade 111 </ b> A in the present embodiment has an outer peripheral surface (circumferential surface) as compared with the first cylindrical rotary blade 111 in the cutter unit 100 according to the first embodiment. In addition, a second unevenness (knurl) 114A is additionally formed.

The second unevenness (knurl) 114A starts from the end 111b (the end on the side where the first unevenness (knurl) 114 is not formed), and the other end 111a ( the first unevenness (knurl) 114). Is formed in a region in a range not in contact with the first unevenness (knurl) 114 (to the end portion on the side where) is formed.

  The second unevenness (knurl) 114A starts from the end 111b (the end on the side where the first unevenness (knurl) 114 is not formed), and the other end 111a first unevenness (knurl) 114 It is formed in a region in a range not in contact with the first unevenness (knurl) 114 toward the end portion on the side where it is formed.

  When the length of the first unevenness (knurl) 114 in the axial direction of the first shaft 110 is L2, and the length of the second unevenness (knurl) 114A in the same direction is L3, (L2 + L3) is a cylindrical rotary blade. It is equal to 20% of the length L1 in the same direction of 111A.

  Also with the cutter unit according to the present embodiment, an effect equivalent to that of the cutter unit 100 according to the first embodiment can be obtained.

  In particular, in the cutter unit according to the present embodiment, the concave and convex portions (knurls) 114 and 114A are formed on both end sides of the cylindrical rotary blade 111A in the axial direction of the first shaft 110, respectively. Compared with the cutter unit 100 according to the above, it is possible to improve the function of winding paper into the meshing surface 563 of the first cylindrical rotary blade and the second cylindrical rotary blade.

  As in the case of the cutter unit 100 according to the first embodiment, the ratio of (L2 + L3) to the length L1 in the same direction of the cylindrical rotary blade 111A is not limited to 20%. If this ratio is 50% or less, an effect equivalent to that of the cutter unit according to the present embodiment can be obtained.

  The minimum value of the above ratio was 1%. In this case, the effective minimum length of the region 113 forming the first unevenness (knurl) 114 is 0.5% of the length of the first cylindrical rotary blade 111 or the second cylindrical rotary blade 121 in the axial direction. The effective minimum length of the region for forming the second unevenness (knurl) 114A is 0.5% of the axial length of the first cylindrical rotary blade 111 or the second cylindrical rotary blade 121. there were.

(Third embodiment)
FIG. 4 is a plan view of a cylindrical rotary blade 111B used in the cutter unit according to the third embodiment of the present invention.

  In the cutter unit according to this embodiment, instead of the first cylindrical rotary blade 111 and the second cylindrical rotary blade 121 in the cutter unit 100 according to the first embodiment, a cylindrical rotary blade shown in FIG. 111B is used.

  As shown in FIG. 4, the cylindrical rotary blade 111 </ b> B in the present embodiment has an end portion 111 b (first portion) as compared with the first cylindrical rotary blade 111 in the cutter unit 100 according to the first embodiment. A sharp convex portion 131 is additionally formed on the end portion where the concave and convex portions (knurls) 114 are not formed.

  The convex portion 131 has, for example, a triangular cross section, and one vertex of the triangle faces the outside in the radial direction of the cylindrical rotary blade 111B.

  The height of the convex portion 131 is preferably in the range of 1 to 5% of the diameter of the cylindrical rotary blade 111B.

  For example, when the diameter of the cylindrical rotary blade 111B is 100 mm, the height of the convex portion 131 is preferably in the range of 1 to 5 mm.

  By forming the convex portion 131, it is possible to improve the function of winding the paper on the meshing surface 563 of the first cylindrical rotary blade and the second cylindrical rotary blade, and also to cut the paper. Can be improved.

  In addition, as shown in FIG. 5, it replaces with the convex part 131, and forms the convex part 132 pointed at the edge part 111a (end part in which the 1st unevenness | corrugation (knurl) 114 is formed). Is also possible. By forming the convex portion 132, the same effect as that of forming the convex portion 131 can be obtained.

  Alternatively, as shown in FIG. 6, a convex portion 132 can be formed in addition to the convex portion 131.

  Moreover, it is also possible to form convex portions similar to the convex portions 131 and 122 on the cylindrical rotary blade 111A shown in FIG.

FIG. 1 is a plan view when the cutter unit for a sheet cutter according to the first embodiment of the present invention is viewed from above. FIG. 2 is an enlarged plan view showing only one first cylindrical rotary blade in the cutter unit for a sheet cutter according to the first embodiment of the present invention. FIG. 3 is a plan view of a cylindrical rotary blade used in the cutter unit according to the second embodiment of the present invention. FIG. 4 is a plan view of a cylindrical rotary blade used in the cutter unit according to the third embodiment of the present invention. FIG. 5 is a plan view of a modification of the cylindrical rotary blade used in the cutter unit according to the third embodiment of the present invention. FIG. 6 is a plan view of a modification of the cylindrical rotary blade used in the cutter unit according to the third embodiment of the present invention. FIG. 7 is a perspective view of a conventional sheet cutting machine. FIG. 8 is a longitudinal sectional view showing the internal structure of the conventional sheet cutting machine shown in FIG. FIG. 9 is a plan view of the cutter unit built in the conventional sheet cutter shown in FIG. 7 as viewed from above.

Explanation of symbols

100 Cutter unit for sheet cutting machine 110 according to the first embodiment of the present invention 110 First shaft 111 First cylindrical rotary blade 111A, 111B, 111C, 111D Cylindrical rotary blade 111a First cylindrical rotary blade End portion 111b End portion 112 of first cylindrical rotary blade 114 Clearance 114 between first cylindrical rotary blades First unevenness (knurl)
114A Second irregularity (knurl)
120 Second shaft 121 Second cylindrical rotary blade 122 Gap 131, 132 between second cylindrical rotary blades

Claims (3)

A first shaft, a plurality of first cylindrical rotary blades formed on the first shaft at a constant pitch concentrically with the first shaft, a second shaft, and the second shaft; A plurality of second cylindrical rotary blades concentrically formed on the second shaft at the pitch, and the plurality of second cylinders in gaps between the plurality of first cylindrical rotary blades A cutter unit for a sheet cutting machine in which each of the shaped rotary blades meshes, and each of the plurality of first cylindrical rotary blades meshes with a gap between the plurality of second cylindrical rotary blades,
On the circumferential surfaces of the plurality of first cylindrical rotary blades and the plurality of second cylindrical rotary blades, the plurality of first cylinders in the axial direction of the first axis and the second axis. Starting from an end located on the same side of the rotary blade and the plurality of second cylindrical rotary blades, toward the other end, the plurality of first cylindrical rotary blades and the plurality of second cylindrical rotary blades In the region of a length shorter than the length in the axial direction of the two cylindrical rotary blades, the first unevenness is formed ,
A cutter unit for a sheet cutter, wherein a sharp convex portion is formed at the other end . The length of the region where the first unevenness is formed is equal to or less than 50% of the length in the axial direction of the plurality of first cylindrical rotary blades and the plurality of second cylindrical rotary blades. The cutter unit for a sheet cutter according to claim 1, wherein the cutter unit is at least%. A sheet cutter comprising the cutter unit for a sheet cutter according to claim 1 or 2 .

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