JP6308485B1 - Cutting tool - Google Patents

Abstract

The present invention provides a cutting tool that can clean a cut surface of a slit formed in a sheet material such as a corrugated cardboard sheet. A cutting tool includes a blade body formed in a fan shape, a grooving blade 21 for forming a slit, and a pressing portion 3 made of a rigid material, and the grooving blade is provided on an outer peripheral portion of the blade body. It is provided on each side edge of the blade body in the thickness direction, and the pressing part is arranged on the outer peripheral part of the blade body between each grooving blade, and the pressing part has a diameter of the blade body rather than the cutting edge part of the grooving blade. A projecting end surface projecting outward in the direction, and an inclined pressing auxiliary surface 32 connecting each side edge of the protruding end surface and each cutting edge of the grooving blade, and the pressing auxiliary surface has a plurality of concave portions 321. Are formed between the recesses, and a pressing auxiliary surface remaining portion 32a having a side edge of the projecting end surface and a boundary side edge that linearly connects the edge of the grooving blade is formed between the recesses. Cutting tool provided. [Selection] Figure 3

Description

  The present invention relates to a cutting tool. In particular, the present invention relates to a cutting tool for forming a slit in a sheet material such as a cardboard sheet.

  As a packaging box for storing or moving things, a cardboard box manufactured by assembling a cardboard sheet 50 as shown in FIG. 9 is known. The top lid and bottom plate of the cardboard box are formed by folding slits 51 and 52 formed in a part of the cardboard sheet 50 so that they are overlapped with each other.

  In forming the slits 51 and 52, a grooving device is generally used, and a cutting tool 60 as shown in FIG. 10 is often used for the grooving device (for example, Patent Document 1). See prior art).

  In this cutting tool 60, a cutting blade 62 and a cutting blade 63 are integrally formed on a blade body 61 formed in a fan shape. The notch generating blade 62 protrudes radially outward from one end of the outer peripheral surface of the blade body 61 so as to be flush with the end surface of the blade body 61, and includes corner portions 64 on both sides in the width direction of the end surface. Yes. The cutting blades 63 are provided on both sides in the thickness direction of the blade body 61 along the outer peripheral surface of the blade body 61.

  The cutting tool 60 is attached to a grooving device 70 as shown in FIGS. FIG. 11 is a side view showing a schematic configuration of the grooving device, and FIG. 12 is a front view. Two cutting tools 60 described above are attached to the grooving device 70, and the configuration of the grooving device 70 will be described below with the cutting tools 60a and 60b as the respective cutting tools.

  The grooving device 70 includes an upper rotating shaft 71 and a lower rotating shaft 72. The upper rotary shaft 71 and the lower rotary shaft 72 are arranged in parallel with each other so as to face each other with the sheet feeding line L interposed therebetween, and a pair of disk-like upper rotary holders 73 and 73 and a pair of lower sides are arranged. Rotating holders 74 and 74 are provided.

  Two cutting blades 60a and 60b are sandwiched between a pair of upper rotating holders 73 and 73 by fasteners (not shown) such as bolts. These cutting blades 60a, 60b are spaced apart from each other along the outer circumference of the pair of rotary holders 73, 73, and the respective cut generating blades 62a, 62b face each other along the outer circumferential direction. It is attached. On the other hand, the two receiving blades 75, 75 are attached to the opposing surfaces of the pair of lower rotating holders 74, 74 at a predetermined interval corresponding to the thickness dimension of the cutting blades 60a and 60b. It is done.

  Next, a method for forming a slit in the cardboard sheet 50 using the grooving device 70 having the above configuration will be described. As shown in FIG. 11, the corrugated cardboard sheet 50 is moved along the sheet feeding line L of the grooving device 70 with the upper rotating holders 73 and 73 and the lower rotating holders 74 and 74 rotated. Feed to the grooving device 70 from the right side. As a result, the cutting tool 60a is sandwiched between the receiving blades 75 and 75, and the corrugated cardboard sheet 50 is cut to form the front slit 51 having the end portion 53 as an end point as shown in FIG. Similarly, the other cutting tool 60b is sandwiched in the gap between the receiving blades 75, 75, the cardboard sheet 50 is cut, and the rear slit 52 starting from the starting end 54 is formed.

JP-A-9-39118

  However, when slitting is performed using a conventionally used cutting tool, the entire or partial area of the cut surface is curved as shown in FIGS. In addition, there is a problem that it becomes a wavy state or a jagged state. When such a defective cutting portion occurs, the appearance of the sheet material is poor, and the commercial value of the sheet material is reduced.

  The present invention has been made in order to solve such problems, and provides a cutting tool for cutting which can clean a cut surface of a slit formed in a sheet material such as a corrugated cardboard sheet. With the goal.

  The object of the present invention is a cutting tool for forming a slit in a sheet material, comprising a blade body, a grooving blade for forming a slit, and a pressing portion made of a rigid material, and the blade body Is formed in a fan shape, and the grooving blades are provided on both side edges in the thickness direction of the blade body along the outer periphery of the blade body, and the pressing portion is the thickness of the blade body. Is disposed on the outer peripheral portion of the cutter body between the grooving blades provided at both side edges in the direction, and the pressing portion is radially outward of the cutter body from the cutting edge portion of the grooving blade. A protruding end surface that protrudes, and each of the side edges of the protruding end surface and each of the cutting edges of the grooving blade is connected to an inclined surface-shaped pressing auxiliary surface, and the pressing auxiliary surface includes a plurality of concave portions. A group is formed, and Between the side edges of the protruding end face, and, pressing the auxiliary surface remaining portion having a boundary edge which connects the cutting edge of the grooving blade in a straight line is achieved by cutting a tool provided.

  Since it has such a pressing part, when forming a slit in a sheet material such as a corrugated cardboard sheet, the grooving blade cuts the sheet material after the protruding end surface presses the sheet material and deforms the sheet material. Will be. The predetermined portion of the sheet material to be cut by the grooving blade is tensioned by the pressing of the sheet material by the protruding end surface immediately before being cut, so that the grooving blade is in a predetermined state of the sheet material. It will cut into the position and cut smoothly. Furthermore, when the projecting end surface presses the sheet material and deforms the sheet material, the pressing assist surface also presses and deforms the sheet material in the same manner. Since the sheet material partially bites into the concave portion, it is possible to more effectively suppress the positional deviation of the sheet material when the sheet material is cut by the groove cutting blade. As a result, it is possible to effectively prevent the entire or partial region of the cut surface from being curved, wavy, or jagged, and form a slit having a clean cut surface. It becomes possible. Further, in particular, since the side edges of the projecting end surfaces and the pressing auxiliary surface remaining portions having the boundary side edges that connect the cutting edge portions of the grooving blades in a straight line are provided between the recesses, the boundary side edges Is effectively caught on the sheet material, and the positional deviation of the sheet material when the sheet material is cut by the groove cutting blade can be further suppressed. Here, the shape of the cutting edge portion of the grooving blade is not particularly limited, but the cutting edge portion of the grooving blade is preferably formed in a sawtooth shape.

  In the cutting tool, the boundary side edge is preferably configured to extend along a radial direction of the blade body when the blade body is viewed in plan. In the case of such a configuration, since the boundary side edge bites in the direction perpendicular to the longitudinal direction of the sheet material portion (cut-off portion) cut off as a slit by the cutting tool attached to the grooving device, The positional deviation of the sheet material when the sheet material is cut by the grooving blade can be more effectively suppressed.

  Moreover, it is preferable that the said press part is comprised so that the outer peripheral part of the said cutter main body may be followed. In this way, by configuring the pressing portion so as to be along the outer peripheral portion of the blade body, the cut surface can be made clean in the entire slit formed in the sheet material.

  Moreover, it is preferable that each said recessed part is formed in the whole region of the said press auxiliary | assistant surface along the circumferential direction of the said cutter main body. By adopting such a configuration, the cut surface can be made clean in the entire slit region formed in the sheet material.

  Moreover, it is preferable that the said recessed part group is comprised so that at least a 1st recessed part and a 2nd recessed part which has a shape different from the said 1st recessed part may be provided. By configuring the recess group as a set of recesses having different shapes in this way, the positional deviation of the sheet material when the sheet material is cut by the groove cutting blade can be further effectively suppressed. It is possible to effectively prevent the entire or partial area of the cut surface from being curved, wavy, or jagged, and to form a slit having a clean cut surface. It becomes.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting tool for cutting which can make the cut surface of the slit formed in sheet materials, such as a corrugated cardboard sheet, a beautiful state can be provided.

It is a top view of the cutting tool for cutting which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a principal part expanded sectional view which shows the cross-sectional shape of the cutter for cutting shown in FIG. It is a principal part enlarged plan view of the cutter for cutting shown in FIG. It is a principal part enlarged plan view regarding the modification of the cutting tool for cutting shown in FIG. It is explanatory drawing explaining the state of the sheet | seat material slit-processed with the cutting tool shown in FIG. It is explanatory drawing explaining the state of the sheet | seat material slit-processed with the cutting tool shown in FIG. It is a principal part enlarged plan view regarding the modification of the cutting tool for cutting shown in FIG. It is a schematic plan view of the corrugated cardboard sheet after the slit is formed. It is a top view of the conventional cutting tool. It is a side view which shows schematic structure of the grooving apparatus with which the cutting tool was attached. It is a front view which shows schematic structure of the grooving apparatus with which the cutting tool was attached. It is an enlarged view which shows an example of the slit formed in the corrugated cardboard sheet.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view showing a cutting tool according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA. The cutting blade 1 is a blade for forming a slit in a sheet material such as a corrugated cardboard sheet or a synthetic resin sheet. As shown in FIGS. 1 and 2, the blade body 2, a grooving blade 21, A pressing unit 3 and a cut generating blade 4 are provided.

  The blade body 2 is made of a metal material such as stainless steel, iron, or tool steel, and has a fan shape in plan view as shown in FIG.

  The grooving blades 21 are provided on both side edges in the thickness direction of the blade body 2 along the outer peripheral portion of the blade body 2 in the same manner as the conventional cutting tool 60 (see FIG. 10).

  The pressing portion 3 is a region sandwiched between the groove cutting blades 21 provided on both side edges in the thickness direction of the blade body 2, and is disposed on the outer peripheral portion of the blade body 2. Further, a projecting end surface 31 that projects outward in the radial direction of the blade body 2 is provided. The pressing portion 3 is made of a rigid metal material such as stainless steel, iron, or tool steel. The pressing portion 3 is configured along the outer peripheral portion of the blade body 2, and one end portion of the pressing portion 3 is disposed at one circumferential end position 2 a of the outer peripheral portion of the blade body 2. Yes. Further, the other end portion of the pressing portion 3 is disposed in the vicinity of the cut generating blade 4 disposed at the other circumferential end portion 2 b of the outer peripheral surface of the cutter body 2. Further, the protruding end surface 31 of the pressing portion 3 is formed to be a smooth curved surface. The protruding amount H of the protruding end surface 31 with respect to the cutting edge of the grooving blade 21 is appropriately determined by the thickness or hardness of the corrugated cardboard sheet 50 in which the slit is formed, the rotational speed of the rotary shafts 71 and 72 of the grooving device, etc. However, for example, it is preferable to set the protruding amount H of the protruding end surface 31 with respect to the cutting edge of the grooving blade 21 to be 10 mm or less.

  Further, as shown in the cross-sectional view of FIG. 2, the pressing portion 3 protrudes from the inclined auxiliary pressing surface 32 that connects the side edge along the longitudinal direction of the protruding end surface 31 and the blade edge portion of the grooving blade 21. It is provided on both sides of the end face 31. In the present embodiment, the pressing assist surface 32 is configured to be a linear inclined surface in a cross-sectional view. Here, as shown in the enlarged cross-sectional view of the main part of the pressing assist surface 32 that connects the side edge of the protruding end surface 31 and the cutting edge portion of the grooving blade 21, the cutting edge at the cutting edge portion forms an obtuse angle. It is configured as an inclined surface. As shown in the enlarged plan view of the main part of FIG. 4, the pressing assist surface 32 is formed with a recess group including a plurality of recesses 321. Each recessed part 321 which comprises a recessed part group is disperse | distributed and formed in the whole region of the press auxiliary | assistant surface 32 along the circumferential direction of a cutter main body. Here, FIG. 3A is a cross-sectional view corresponding to the BB cross-sectional position in FIG. 4, and FIG. 3B is a cross-sectional view corresponding to the CC cross-section in FIG. In the present embodiment, each recess 321 is configured to have the same form. Moreover, as long as each recessed part 321 is comprised so that a part of sheet material may bite at the time of sheet material cutting | disconnection, the magnitude | size and shape are not specifically limited. Moreover, it is preferable that each recessed part 321 is formed in the press auxiliary | assistant surface 32 along the whole area of the circumferential direction of the said cutter main body at predetermined intervals, for example, especially in the slit formed in a sheet | seat material, You may comprise so that it may form in the predetermined position of the press auxiliary | assistant surface 32 in the circumferential direction position of the cutter main body corresponding to the location where the cut surface curves, the location where it wavy.

  Moreover, as shown in the enlarged plan view of the main part of FIG. 4, the cutting edge portion of the grooving blade 21 is formed in a sawtooth shape extending along the circumferential direction of the cutter body. Such a sawtooth-shaped cutting edge portion is formed by, for example, performing a step of cutting the inclined pressing auxiliary surface 32 at a stage before the formation of the concave group with a cutting tool such as an end mill to a predetermined depth. It can be formed by sequentially performing along the direction. By passing through such a cutting process, it is possible to simultaneously form a plurality of concave portions 321 on the inclined pressing assist surface 32 while forming a sawtooth-shaped cutting edge portion. Further, in the configuration shown in FIG. 4, a part of the periphery of the plurality of recesses 321 included in the recess group constitutes a part of the cutting edge portion of the groove cutting blade 21 (sawtooth-shaped cutting edge). A part of the peripheral edge of the plurality of recesses 321 constitutes a side edge along the longitudinal direction of the protruding end surface 31. That is, each recessed part 321 is comprised so that a part of side edge of a press end surface and a part of blade edge part of the groove cutting blade 21 may be included in the periphery.

  Moreover, between each recessed part 321, the press auxiliary | assistant surface residual part 32a which has the side edge 32b which connects the side edge of the protrusion end surface 31 and the blade edge part of the groove cutting blade 21 linearly is provided. . As shown in FIG. 4, the boundary side edge 32 b that is the boundary between the pressing assist surface remaining portion 32 a and the recess 321 extends along the radial direction of the blade body 2 when the blade body 2 is viewed in plan. It is preferable to be configured. The longitudinal direction of the boundary side edge 32b (the direction in which the boundary side edge 32b extends) is limited to being configured to extend along the radial direction of the blade body 2 when the blade body 2 is viewed in plan. Instead of the thing, when the blade body 2 is viewed in plan, the blade body 2 may be configured to be inclined at a predetermined angle with respect to the radial direction of the blade body 2. Here, in the configuration shown in FIG. 4, the width of the pressing assist surface remaining portion 32 a (the width in the direction along the circumferential direction of the blade body 2) is configured to be 1 mm or less. It does not specifically limit to a structure, As shown in the principal part enlarged plan view of FIG. 5, you may comprise so that it may become a width dimension of about 3 mm-8 mm, for example.

  The incision generating blade 4 is a blade portion for cutting off one end of a scrap piece that is produced when slitting is performed by the cutting tool 1 from the corrugated cardboard sheet, and radially outward from one end of the outer peripheral surface of the cutter body 2. The blade body 2 protrudes so as to be flush with the end face of the blade body 2 and has corners on both sides of the end face in the width direction.

  The cutting tool 1 having the above configuration is used by being attached to a grooving device 70 as shown in FIGS. 11 and 12, for example. Since the method for forming the slits in the corrugated cardboard sheet is the same as the method described in the background art above, detailed description is omitted here.

  The cutting tool 1 for cutting according to the present embodiment is disposed on the outer peripheral portion of the cutter body 2 between the grooving blades 21 provided on both side edges in the thickness direction of the cutter body 2, and from the cutting edge of the grooving blade 21. Since the pressing portion 3 made of a rigid material having a protruding end surface 31 protruding outward in the radial direction of the blade body 2 is provided, when forming a slit in a sheet material such as a cardboard sheet, as shown in FIG. After the protruding end surface 31 first presses the sheet material to deform the sheet material, the groove cutting blade 21 cuts into the sheet material and cuts it. The predetermined portion of the sheet material 50 cut by the grooving blade 21 is in a state of being tensioned by the pressing of the sheet material by the protruding end surface 31 immediately before being cut, so that the grooving blade 21 is The sheet material 50 is firmly cut into a predetermined position and is cut smoothly. As a result, it is possible to effectively prevent the entire or partial region of the cut surface from being curved, wavy, or jagged, and form a slit having a clean cut surface. It becomes possible.

  Moreover, since the press part 3 is comprised in the substantially whole region so that the outer peripheral part of the cutter main body 2 may be followed, it is possible to make the cut surface beautiful in the slit whole area formed in the sheet material 50. It becomes. Further, since the protruding end surface 31 of the pressing portion 3 is a smooth curved surface, the slit forming region in the sheet material 50 can be pressed and deformed with a uniform pressing force. As a result, the cut surface of the slit can be made more beautiful.

  Furthermore, the cutting tool 1 for cutting according to the present embodiment includes the pressing assisting surface 32 having an inclined surface-like pressing auxiliary surface 32 in which the pressing portion 3 connects the side edge of the protruding end surface 31 and the cutting edge of the groove cutting blade 21. The surface 32 is configured to be provided with a recess group composed of a plurality of recesses 321. With such a configuration, when the pressing deformation of the sheet material 50 is advanced by the pressing portion 3, the pressing assist surface 32 similarly presses and deforms the sheet material 50 as shown in FIG. By the pressing action of the pressing assist surface 32, the sheet material partially bites into the plurality of recesses 321 formed on the pressing assist surface 32, and the sheet material 50 existing in the vicinity of the cutting edge of the grooving blade 21. Since it is possible to reliably hold and hold a part of the region, the position of the grooving blade 21 with respect to the sheet material 50 is prevented from being shifted before cutting, and the cutting edge of the grooving blade 21 is prevented from slipping during cutting. Processing can be performed. As a result, it is possible to effectively prevent the entire or partial region of the cut surface from being curved, wavy, or jagged, and form a slit having a clean cut surface. It becomes possible. In particular, a pressing auxiliary surface remaining portion 32 a having a side edge of the projecting end surface 31 and a boundary side edge 32 b that linearly connects the cutting edge portion of the groove cutting blade 21 is provided between the recesses 321. Therefore, the boundary side edge 32b is effectively caught on the sheet material 50 over a wide range of the pressing assist surface, and the positional deviation of the sheet material 50 when the sheet material 50 is cut by the grooving blade 21 is further suppressed. be able to.

  The boundary side edge 32b is preferably configured to extend along the radial direction of the blade body 2 when the blade body 2 is viewed in plan. In the case of such a configuration, the boundary side edge 32b bites in a direction perpendicular to the longitudinal direction of the sheet material portion (cut-off portion) cut off as a slit by the cutting tool 1 attached to the grooving device. Therefore, it is possible to more effectively suppress the positional deviation of the sheet material 50 when the sheet material 50 is cut by the groove cutting blade.

  The cutting tool 1 according to the embodiment of the present invention has been described above, but the specific configuration of the cutting tool 1 is not limited to the above embodiment. For example, in the above-described embodiment, the concave portions 321 are configured to have the same form with respect to the concave group formed on the pressing assist surface 32. However, the configuration is not limited to such a configuration. For example, FIG. As shown in the enlarged plan view of the main part, the concave group may be configured as a set of concave parts having different forms. In FIG. 8, the recess group is configured as a set of recesses having two types of forms, a first recess 321a and a second recess 321b having a shape different from that of the first recess 321a. Yes. In FIG. 8, the first recess 321a has a width (distance between the boundary side edges 32b) larger than the width of the second recess 321b (distance between the boundary side edges 32b). Yes. In FIG. 8, the recess group is configured to include two types of recesses 321 a and 321 b having different forms. However, the recess group may be configured to include three or more types of recesses having different forms. . In FIG. 8, the first recesses 321a and the second recesses 321b are configured to be alternately arranged along the circumferential direction of the blade body. Each concave portion 321 may be arranged in the upper part.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Blade body 21 Groove cutting blade 3 Pressing part 31 Protruding end surface 32 Pressing auxiliary surface 32a Pressing auxiliary surface remaining part 32b Boundary side edge 321 Concave 4 Cutting generation blade 50 Sheet material

Claims (6)

A cutting tool for forming a slit in a sheet material,
A blade body, a groove cutting blade that forms a slit, and a pressing portion made of a rigid material,
The blade body is formed in a fan shape,
The grooving blades are respectively provided on both side edges in the thickness direction of the blade body along the outer periphery of the blade body.
The pressing portion is disposed on the outer peripheral portion of the blade body between the grooving blades provided on both side edges in the thickness direction of the blade body,
The pressing portion is connected to the projecting end surface projecting radially outward of the cutter body from the cutting edge portion of the grooving blade, and the side edges of the projecting end surface and the cutting edge portions of the grooving blade. A planar pressing auxiliary surface,
A concave group consisting of a plurality of concave portions is formed on the pressing assist surface,
A cutting tool for cutting, provided with a pressing auxiliary surface remaining portion having a side edge of the protruding end surface and a boundary side edge that linearly connects the edge of the groove cutting blade between the concave portions.   The cutting edge cutter according to claim 1, wherein the boundary side edge is configured to extend along a radial direction of the blade body when the blade body is viewed in plan.   The cutting tool according to claim 1 or 2, wherein the pressing portion is configured to follow an outer peripheral portion of the blade body.   Each said recessed part is a cutting tool for cutting in any one of Claim 1 to 3 currently formed in the whole region of the said press auxiliary | assistant surface along the circumferential direction of the said cutter main body.   The cutting tool according to any one of claims 1 to 4, wherein the recess group is configured to include at least a first recess and a second recess having a shape different from that of the first recess. . The cutting edge cutter according to any one of claims 1 to 5, wherein a cutting edge portion of the grooving blade is formed in a sawtooth shape.

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