JP4915711B1 - 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 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. 2 is formed in a fan shape, and the grooving blade 21 is provided on each side edge in the thickness direction of the blade body 2 along the outer peripheral portion of the blade body 2. Are arranged on the outer peripheral portion of the blade body 2 between the grooving blades 21 provided on both side edges in the thickness direction of the blade, and protrude beyond the cutting edge of the grooving blade 21 in the radial direction of the blade body 2. A cutting tool 1 having an end face 31.
[Selection] Figure 2

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. A projecting end face that is disposed on the outer peripheral portion of the blade body between the grooving blades provided on both side edges in the direction and projects radially outward from the cutting edge of the grooving blade. This is achieved by a cutting tool.

  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. 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 the cutting tool, it is preferable that the pressing portion is configured along the outer peripheral portion of the blade body. 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 the protrusion end surface of the said press part is a smooth curved surface. Thus, by making the protruding end surface of the pressing portion a smooth curved surface, the slit forming region in the sheet material can be pressed and deformed with a uniform pressing force, and as a result, the slit cutting surface can be further improved. It can be in a beautiful state.

  Moreover, it is preferable that the said press part is provided with the pressing surface of an inclined surface shape which connects the side edge of the said projecting end surface, and the blade edge | tip of the said groove cutting blade. By providing such a pressing assist surface, when the sheet material is pressed and deformed by the protruding end surface, the pressing assist surface is similarly pressed and deformed by the sheet material. Because of the pressing action of the pressing assist surface, the sheet material existing in the vicinity of the cutting edge of the grooving blade can be reliably pressed, so the position of the grooving blade with respect to the sheet material is shifted before cutting, or the grooving blade It is possible to perform slit processing while preventing the blade edge from slipping.

  Moreover, it is preferable that the said press auxiliary | assistant surface is a curved surface shape dented in the direction opposite to the protrusion direction of the said press part. In this way, when the pressing assist surface is configured to have a curved surface shape, it is possible to suppress the amount of deformation of the predetermined region of the sheet material that the cutting edge of the grooving blade bites into, so that by pressing the sheet material by the protruding end surface It is possible to effectively prevent the sheet material near the cut portion from tearing.

  Moreover, it is preferable that the said press part is comprised so that attachment or detachment is possible with respect to the said cutter main body.

  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 modification of the cross-sectional shape of the cutter for cutting shown in FIG. It is a principal part expanded sectional view which shows the modification of the cross-sectional shape of the cutter for cutting shown in FIG. It is a principal part expanded sectional view which shows the modification of the cross-sectional shape of the cutter for cutting shown in FIG. It is a principal part expanded sectional view which shows the modification of the cross-sectional shape of the cutter 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 a principal part expanded sectional view which shows the modification of the cross-sectional shape of the cutter 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 to which the cutting tool shown in FIG. 1 was attached. It is a front view which shows schematic structure of the grooving apparatus to which the cutting tool shown in FIG. 1 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 or iron, and is formed in a fan shape in plan view as shown in FIG.

  The grooving blades 21 are respectively provided on both side edges in the thickness direction of the blade body 2 along the outer peripheral portion of the blade body 2, similarly to 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, from the cutting edge of the groove cutting blade 21. Is also provided with a projecting end surface 31 projecting radially outward of the blade body 2. The pressing portion 3 is made of a rigid metal material such as stainless steel or iron. 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 has an inclined pressing auxiliary surface 32 connecting the side edge along the longitudinal direction of the protruding end surface 31 and the cutting edge of the grooving blade 21. 31 on both sides. The auxiliary pressing surface 32 is configured to have a curved surface shape that is recessed in a direction opposite to the protruding direction of the pressing portion 3 in a sectional view. Here, the curved surface shape recessed in the direction opposite to the protruding direction of the pressing portion 3 connects the side edge of the protruding end surface 31 and the cutting edge of the grooving blade 21 in a sectional view as shown in FIG. In addition to the surface formed by the gently curved surface, as shown in the cross-sectional view of FIG. 3, the surface formed by combining the flat portion 32a and the curved surface portion 32b, as shown in the cross-sectional view of FIG. It is a concept that includes a surface formed by combining a plurality of planar portions 32a. The auxiliary pressing surface 32 that connects the side edge of the projecting end surface 31 and the cutting edge of the grooving blade 21 has a curved surface shape such that the cutting edge of the grooving blade 21 is sharp, as shown in the sectional view of FIG. Alternatively, it may be configured as a flat inclined surface as shown in the sectional view of FIG.

  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. 7 also includes a 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, 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 grooving blade 21 cuts the sheet material. 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.

  Moreover, since the pressing part 3 is comprised so that the side edge of the protrusion end surface 31 and the blade edge | tip of the groove cutting blade 21 may be connected to the inclined surface-shaped pressing auxiliary surface 32, the sheet material 50 is provided by the pressing part 3. When the pressing deformation is advanced, the pressing auxiliary surface 32 also presses and deforms the sheet material 50 in the same manner. By the pressing action of the pressing assist surface 32, a partial region of the sheet material 50 existing in the vicinity of the cutting edge of the grooving blade 21 can be reliably pressed, so that the position of the grooving blade 21 with respect to the sheet material 50 is before cutting. Slit processing can be performed while preventing slippage or slippage of the cutting edge of the grooving blade 21 during cutting. In particular, when the pressing assist surface 32 is configured to be a curved surface that is recessed in the direction opposite to the protruding direction of the pressing portion 3, the deformation amount of a predetermined region of the sheet material 50 into which the cutting edge of the grooving blade 21 bites increases. Since this can be suppressed, it is possible to effectively prevent the sheet material 50 in the vicinity of the cut portion from being torn by the pressing of the sheet material 50 by the protruding end surface 31.

  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 said embodiment, you may comprise so that the press part 3 can be attached to the cutter main body 2 so that attachment or detachment is possible. Specifically, for example, a through-hole penetrating from the inner peripheral portion side to the outer peripheral portion side of the blade body 2 is formed, and the blade main body 2 is formed by a bolt inserted into the through-hole from the inner peripheral portion side of the blade main body 2. You may comprise so that the press part 3 comprised as a separate body may be fixed on the outer peripheral part of the cutter main body 2. FIG. According to such a configuration, it is possible to place the plate-like spacer member between the outer peripheral portion of the blade body 2 and the pressing portion 3 to install the pressing portion 3 on the blade body 2. It is possible to set the position (projection amount) of the protruding end surface 31 to a desired position (desired projection amount).

  Moreover, in the said embodiment, although it has comprised so that the press part 3 may be provided with the press auxiliary | assistant surface 32 comprised by an inclined surface, it is not specifically limited to such a structure, For example, sectional drawing of FIG. As shown in FIG. 3, the auxiliary pressing surface 32 may be omitted.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Blade body 21 Groove cutting blade 3 Pressing part 31 Protruding end surface 32 Press auxiliary surface 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 cutter body between the grooving blades provided on both side edges in the thickness direction of the cutter body, and the diameter of the cutter body is larger than the cutting edge of the grooving blade. Cutting tool having a projecting end surface projecting outward in the direction.   The cutting tool according to claim 1, wherein the pressing portion is configured to follow an outer peripheral portion of the blade body.   The cutting edge tool according to claim 1 or 2, wherein the protruding end surface of the pressing portion is a smooth curved surface.   4. The cutting tool according to claim 1, wherein the pressing portion includes an inclined pressing auxiliary surface that connects a side edge of the protruding end surface and a cutting edge of the grooving blade. 5.   The cutting tool according to claim 4, wherein the pressing assist surface has a curved surface shape that is recessed in a direction opposite to a protruding direction of the pressing portion. The cutting tool according to any one of claims 1 to 5, wherein the pressing portion is configured to be detachably attached to the blade body.

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