This Application is based on and hereby claims priority to PCT Application No. PCT/JP04/17269 filed on 19 Nov. 2004 and Japanese Application No. 2004-139491 filed on 10 May 2004 and Japanese Application No. 2003-405914 filed on 4 Dec. 2003, the contents of which are hereby incorporated by reference.
The invention relates to a cutting tool.
A corrugated box obtained by folding a corrugated sheet 50 as shown in
The slits are usually formed using a grooving device. A cutting tool 60 as shown in
In the cutting tool 60, a notching blade 62 and a grooving blade 63 are integrally formed on a fan-shaped cutting tool body 61. The notching blade 62 projects outwards radially from one end of the outer surface of the cutting tool body 61 in such a manner as to be flush with the end surface of the cutting tool body 61, and is provided with an angled portion 64 on either side of the end surface in the width direction. The grooving blade 63 is formed on either side of the cutting tool body 61 in the thickness direction along the outer surface of the cutting tool body 61.
The cutting tool 60 is attached to a grooving device 70 as shown in
The grooving device 70 is provided with an upper rotation axis 71 and a lower rotation axis 72.
The upper rotation axis 71 and the lower rotation axis 72 are positioned in parallel facing each other across a sheet feed line L, and are provided with a pair of disk-like upper rotation holders 73 and 73, and a pair of lower rotation holders 74 and 74, respectively.
Each of the two cutting tools 60a and 60b is held between the pair of lower rotation holders 73 and 73 with a fastening member (not shown), such as a bolt. The cutting tools 60a and 60b are disposed at given intervals along the outer surface of the pair of rotation holders 73 and 73 in such a manner that the notching blades 62a and 62b face each other along the direction of the periphery.
On the other hand, the pair of lower rotation holders 74 and 74 are provided with two receiving blades 75 and 75 on their opposing sides at given intervals in such a manner as to match with the thickness of the cutting tools 60a and 60b.
An explanation as to how to form a slit in the corrugated sheet 50 using the grooving device 70 configured as described above is given below. As shown in
Patent Document 2, Japanese Examined Utility Model Publication No. 1994-1356, teaches a construction in which a cutting tool is provided with notches on either side of the cutting tool body, and notching blades are detachably attached to the notches.
The cutting tool 60 of Patent Document 1 is disadvantageous in that a slit beginning portion 54 of the back slit 52 may be damaged, such as a split, during the formation of the slit. More specifically, as shown in
In order to prevent the damage from occurring at the slit end of the corrugated sheet, Patent Document 1 proposes using a cutting tool which is not provided with the notching blade that causes the damage, and separately providing a cutter device for forming a notch beforehand at a position corresponding to the slit end of the corrugated sheet.
However, the grooving device of Patent Document 1 thus requires another cutter device, which unfavorably increases the production cost. Moreover, in order to precisely form a notch at the position corresponding to the slit end using a cutter device, the position adjustment of the cutter of the cutter device with respect to the corrugated sheet and the timing adjustment for forming the notch are necessary, which complicates the process.
The present invention has been made to solve the above problems, and aims to provide a cutting tool which can easily and surely prevent damage from occurring at the end portion of the slit formed in a sheet material, such as a corrugated sheet or the like.
The above-described object of the invention can be achieved by a cutting tool including: a cutting tool body, a grooving blade for forming a slit, and a notching blade for forming an end portion of a slit, wherein the cutting tool body is formed in the shape of a fan, the grooving blade is formed along either edge in the thickness direction of the cutting tool body, the notching blade is provided with a semi-cylindrical blade edge and an attachment site capable of being detachably attached to one end of the cutting tool body, and the notching blade is attached to one end of the cutting tool body in such a manner that an outer curved surface of the blade edge is exposed to the outside rather than being in contact with one end of the cutting tool body, and the attachment site is configured such that the blade edge can be adjusted in the radial direction of the cutting tool body.
Preferably, the cutting tool is configured such that the attachment site is provided with an oblong hole, and the notching blade is attached to the cutting tool body by inserting a bolt, via the oblong hole, into a bolt hole formed in one end of the cutting tool body.
Also preferably, the cutting tool has a configuration such that the blade edge is disposed inside rather than outside in the radial direction with respect to the outer periphery of the cutting tool body, and the notching blade can be held.
Further preferably, in the cutting tool, the cutting tool body has a notch formed on one end, which forms a back face inclined at an angle of 5° to 30° to an end surface, and the notching blade is attached to the back face.
Still further preferably, in the cutting tool, the notching blade is provided with a notch at the tip of the blade.
Still further preferably, in the cutting tool, the width of the notching blade is shorter by 0.1 mm to 0.3 mm than that of the cutting tool body.
The present invention can provide a cutting tool which can easily prevent damage from occurring at the slit end formed on a sheet material, such as a corrugated sheet or the like.
a) is a plan view of a notching blade as viewed from the top,
Hereinafter, the present invention is described according to embodiments with reference to drawings attached hereto.
The cutting tool body 11 is formed in the shape of a fan, i.e. in an arcuate shape, and is provided with a notch 15 and an attachment hole 16. As shown in
The configuration of the notching blade 12 is schematically shown in
The grooving blade 13 is formed on either side of the cutting tool body 11 in the thickness direction along the outer surface of the cutting tool body 11 in the same manner as in the prior-art cutting tool 60 (see
Hereinafter, an explanation is given to a method for forming a slit in a corrugated sheet using the cutting tool 1 configured as described above.
First, the notching blade 12 is attached to the cutting tool body 11. A fixing jig 30 as shown in
This fixing jig 30 is provided with a pair of plates 31 and 31, a bolt 32, and a nut 33. The pair of plates 31 and 31 have through holes 35 and 35 through which the bolt 32 passes, and projections 34 and 34 are formed on one end of each opposing side of the pair of plates 31 and 31, respectively.
The notching blade 12 is attached to the cutting tool body 11 by hooking the projections 34 and 34 of the fixing jig 30 on the angled portions of the back face 17, and simultaneously fixing the cutting tool body 11 with the bolt 32 and the nut 33 in such a manner as to sandwich the same with the plates 31 and 31. Next, the notching blade 12 is inserted in the gap between the plates 31 and 31, and then is attached to the back face 17 with the bolt 14. After the attachment of the notching blade 12 is complete, the fixing jig 30 is removed.
By using this fixing jig 30, the gap size into which the notching blade 12 is inserted can be kept constant. Therefore, it is possible to easily prevent the notching blade 12 from being displaced when fixing the notching blade 12 to the cutting tool body 11 with the bolt 14, thereby attaching the notching blade 12 in position.
In this process, the width W of the notching blade 12 is preferably shorter by 0.1 mm to 0.3 mm than the thickness V of the cutting tool body 11. The notching blade 12 having a width W that is not in this range can be used, but an excessively small width W increases the level difference in the back face 17 between the notching blade 12 and the cutting tool body 11, which raises the possibility that the slit beginning portion 54 of the back slit 52 may be partially left uncut due to the existence of the level difference. On the other hand, an excessively large width W makes it difficult to hook the projections 34 and 34 of the fixing jig 30 on the angled portions of the back face 17, which makes it difficult to precisely attach the notching blade 12 to the cutting tool body 11 and to form the slit beginning portion 54 of the back slit 52 in the desired shape.
The position of the blade edge 21 with respect to the outer periphery of the cutting tool body is suitably determined in accordance with the thickness or hardness of the corrugated sheet 50 on which the back slit 52 is formed, the rotation rate of the axes of rotation 71 and 72 of the grooving device, etc. The blade edge 21 may be arranged inside or outside with respect to the outer periphery of the cutting tool body 11 in the radial direction. For example, the position of the blade edge 21 can be adjusted in a range from 5 mm toward the inside to 10 mm toward the outside with respect to the outer periphery of the cutting tool body 11 in the radial direction.
In this embodiment, the notching blade 12 is attached using the fixing jig 30. However, the notching blade 12 may be attached without using the fixing jig 30 by forming a key part on the bottom flat surface of the notching blade 12 shown in
Next, the cutting tool 1 in which the notching blade 12 is attached to the cutting tool body 11 is attached in a rotary holder 73 of a grooving device 40 as shown in
As shown in
When the back slit 52 is formed with the cutting tool 1 as shown in
Since the blade edge 21 of the notching blade 12 has a semi-cylindrical shape, there is no angled portion 64 formed therein as there is in the notching blade 62 of the prior-art cutting tool 60 shown in
In this embodiment, the notching blade 12 is attached to the back face 17, which is inclined at 5° to 30° with respect to the end surface 18 of the cutting tool body 11. As shown in
Moreover, as shown in
Moreover, since the notching blade 12 of this embodiment has an oblong hole 23 as shown in
The notching blade 12 of this embodiment is equipped with a semi-cylindrical blade edge as shown in
In the cutting tool 1 of this embodiment, the notching blade 12 can be detachably attached to the cutting tool body 11. Therefore, even if the tip of the notching blade 12 is broken on contact with the receiving blades 75 and 75 (see
Moreover, as shown in
This embodiment relates to the cutting tool 1 for forming a slit in a corrugated sheet, but, needless to say, can be applied to a sheet material other than a corrugated sheet, such as synthetic resins, or the like.
As shown in
Number | Date | Country | Kind |
---|---|---|---|
2003-405914 | Dec 2003 | JP | national |
2004-139491 | May 2004 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/JP2004/017269 | 11/19/2004 | WO | 00 | 12/28/2005 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2005/053918 | 6/16/2005 | WO | A |
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Number | Date | Country | |
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20060156891 A1 | Jul 2006 | US |