JP2017148911A - Processing device for corrugated board and processing method for corrugated board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce processing time required in forming a nearly V-shape groove and improve processing accuracy.SOLUTION: The processing device for a corrugated board has a pair of cutter blades 210 and 210 provided at symmetric positions in the vicinity of a tip of a holder part 200 that moves in a vertical direction relative to a corrugated board 100 to be processed. The cutter blades 210 and 210 are supported by a cutter blade activating mechanism 220 so as to be obliquely displaced from separate positions where the blades are waiting separately to approach positions where the blades approach each other. The cutter blades 210 and 210 are displaced from the separate positions to the approach positions, so that the baldes are obliquely inserted to the corrugated board 100 at the same time. Thereafter, just by controlling the obliquely inserted blades so that the blades are moved in parallel through a holder part along a direction of a surface of the corrugated board 100, a nearly V-shape groove can be formed in just one process. This can reduce processing time for forming the nearly V-shape groove more than in a conventional method.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a corrugated board processing apparatus and a corrugated board processing method.

  A corrugated cardboard (corrugated cardboard sheet) used for packaging or the like is usually cut into a predetermined shape, and a bending push process is performed at a predetermined position. In the case of general corrugated cardboard, a desired shape such as a box or a lid can be assembled by folding from a crease formed by a line pushing process. However, in the case of packing boxes for products for export, packing boxes for heavy items such as refrigerators, etc., reinforced corrugated cardboard, which is usually formed of a plurality of layers, is used using a thick cardboard with high hardness as a liner. In order to bend such a reinforced corrugated cardboard at a desired position, muscle pushing is not sufficient, and a substantially V-shaped groove (V-shaped groove) is formed at the bent portion (see FIG. 5).

  Patent Document 1 relates to an assembly-type corrugated cardboard box using reinforced corrugated cardboard. As described in paragraph 0024, a V-shaped groove having a groove angle of approximately 90 degrees is formed at a bent portion. And as a method of forming this V-shaped groove, cutting using a rotary blade and compression using a press are cited.

However, in recent years, the production of various variations in small lots has increased, and processing by a press machine that requires a die is too costly. In order to form a V-shaped groove using a rotary blade, as shown in FIGS. 7A and 7B, for example, it is inclined 45 degrees to the left with respect to the center of the V-shaped groove to be formed. The rotating blades a to d are supported on one rotating shaft, the rotating blades a ′ to d ′ inclined at 45 degrees on the other side are supported on the other rotating shaft, and one rotating shaft and the other rotating shaft are processed. It is necessary to use a device arranged in parallel at intervals along the traveling direction of the target cardboard. And as shown to Fig.7 (a), a corrugated board is sent from one end side, and the lower side of rotary blade a'-d 'of the other side is passed, and also lower side of rotary blade a-d of one side Thereby forming a V-shaped groove as shown in FIG. 7 (b). Therefore, the structure is complicated and expensive, and is not suitable for small-lot production or trial production. Further, in order to form the V-shaped groove, it is only possible to process from the end of the corrugated cardboard to be processed, and the V-shaped groove cannot be formed only in a predetermined range in the middle. Even if each rotary blade is moved up and down to form a V-shaped groove in the middle of corrugated cardboard, since the rotary blade is circular in a side view as shown in the side view of FIG. Unnecessary cuts behind the points, so-called cut deviations, occur.
On the other hand, the present applicant has developed the apparatus shown in Non-Patent Document 1 as an apparatus suitable for such small lot production and trial production and capable of forming a V-shaped groove without causing a cut shift at a desired position. doing.

  Here, the apparatus shown in Non-Patent Document 1 uses a structure having a structure as shown in FIG. 6 as a V-cutting jig. That is, it is a jig in which a shaft member 5000 and a cutter blade 5100 inclined at 45 degrees are attached to the shaft member 5000. This jig is mounted on a plotter and cut by sliding in a predetermined direction. Since the cutter blade 5100 is slid and cut, the structure can be made compact compared to the case of using a rotary blade, and the manufacturing cost of the apparatus can be reduced. The jig shown in FIG. 6 has a structure that moves in three dimensions by two motors for parallel movement that moves parallel to the machining surface and vertical movement that moves vertically, and forms a substantially V-shaped groove. First, as shown in FIG. 6A, the cutting edge 5101 of the cutter blade 5100 from the position (position indicated by the two-dot chain line) waiting above the surface of the reinforced corrugated cardboard 6000 to be processed is The two motors are driven so as to move the distance A in the parallel direction and the distance B in the vertical (downward) direction at the same speed so as to reach the position 6101 that is the center of the substantially V-shaped groove to be processed. As a result, the cutter blade 5100 is inserted in an oblique direction (arrow C direction) from the surface 6001 of the reinforced corrugated cardboard 6000 at an angle of 45 degrees, and the position (groove) becomes the center of the substantially V-shaped groove. Center) 6101. The blade edge 5101 then forms a 45-degree cut (the first cut in FIG. 6B) over a predetermined length by the shaft member 5000 being translated in the depth direction of FIG. 6A. I will do it.

  When the cut is formed over a predetermined length, the two motors are moved in the opposite directions to pull the cutter blade 5100 from the reinforced cardboard 6000. When the shaft member 5000 and the cutter blade 5100 are reversed 180 degrees and the distance A is moved in the parallel direction and the distance B is moved in the vertical direction at the same speed as described above, the direction of the arrow D in FIG. The cutter blade 5100 is inserted. When the cutting edge 5101 reaches the groove center 6101, it intersects the first notch formed by inserting along the arrow C direction in FIG. 6A, and thereafter, the shaft member in the depth direction of FIG. When 5000 is moved, a V-shaped groove 6100 having a groove angle of 90 degrees is formed as shown in FIG.

JP2013-132300A

SELCAM Corporation, cutting plotter, product page “Progressive” (URL: http://www.shinoda-tec.co.jp/cutting_progressive.html)

  However, in the case of the method disclosed in Non-Patent Document 1, in order to form the V-shaped groove, it is necessary to change the direction and form two reciprocal cuts. Therefore, there exists a problem that processing time takes. Also, when forming the second cut, since the first cut has already been made, the corrugated cardboard to be processed is easily lifted by receiving resistance during cutting, and as a result, There is room for improvement in terms of processing accuracy, such as the occurrence of misalignment in the formation position of the second notch, partial uncutting, and the notch being distorted instead of being straight.

  The present invention has been made in view of the above, and is capable of reducing the processing time and improving the processing accuracy when forming a substantially V-shaped groove while using a low-cost slide cut method. It is an object of the present invention to provide an apparatus and a method for processing corrugated cardboard.

In order to solve the above-described problems, the corrugated board processing apparatus of the present invention includes:
A processing apparatus for corrugated board comprising a processing table on which a corrugated cardboard to be processed is supported, a processing head supported to be movable relative to the processing table, and a control unit,
The processing head is
A holder part movable in a direction perpendicular to the processing table;
A pair of cutter blades provided at symmetrical positions in the holder part;
A cutter blade operating mechanism for supporting each cutter blade so that the respective blade tips approach each other by being displaced in an oblique direction from a standby position in which the respective blade tips of the respective cutter blades are separated from each other;
When the control unit controls the holder unit so as to approach the cardboard in the vertical direction, the blade edges of the cutter blades approach and are inserted into the cardboard, and the cutter blades are inserted into the cardboard together. In the inserted state, the holder portion is controlled so as to move in the surface direction of the cardboard to form a substantially V-shaped groove.

The holder part has a tapered surface provided symmetrically so as to be inclined obliquely downward from the outer side part toward the inner side in the vicinity of the lower end part thereof,
It is preferable that each cutter blade is movable along each tapered surface.

  It is preferable that the cutter blade operating mechanism is configured to displace each cutter blade obliquely with an inclination angle in a range of 40 to 50 degrees with respect to the cardboard.

Further, the corrugated cardboard processing method of the present invention includes a processing table on which a corrugated cardboard to be processed is supported, a processing head supported to be movable with respect to the processing table, and a control unit.
The processing head is
A holder part movable in a direction perpendicular to the processing table;
A pair of cutter blades provided at symmetrical positions in the holder part;
Using a processing apparatus for corrugated cardboard provided with a cutter blade operating mechanism for operating the cutter blades so that the blade edges approach each other from a standby position where the blade edges of the cutter blades are separated from each other. A method for processing a corrugated cardboard, wherein a substantially V-shaped groove is formed in the corrugated cardboard,
By the control unit,
A step of moving the holder portion in a direction perpendicular to the cardboard until a sheet pressing member provided at a tip of a lower end thereof contacts the cardboard;
In a state where the cardboard is pressed by the sheet pressing member, the cutter blades are obliquely displaced in the direction in which the blade edges approach each other, and the notches formed by the cutter blades intersect the cardboard. Plugging in until
Forming the substantially V-shaped groove on the cardboard by controlling the step of moving the holder portion in the surface direction of the cardboard and forming the substantially V-shaped groove. Features.

  The present invention has a pair of cutter blades provided at symmetrical positions in the vicinity of the tip of the holder portion that moves in a direction perpendicular to the corrugated board to be processed. Each cutter blade is supported by the cutter blade operation mechanism so as to be displaced obliquely from the position where they are separated and waiting to the position where they approach each other. Therefore, when each cutter blade is displaced from the separation position to the approach position, both are simultaneously inserted obliquely toward the cardboard. After being inserted obliquely, a substantially V-shaped groove can be formed in a single step only by controlling the holder portion to move in parallel along the surface direction of the cardboard.

  Accordingly, the processing time for forming the substantially V-shaped groove can be shortened as compared with the conventional method in which cutting is performed on each side by the slide cut method. In addition, since it is configured to cut with two cutter blades at the same time, unlike conventional devices that form two cuts separately, misalignment due to corrugated cardboard is unlikely to occur, and uncut residue is reduced. , Machining accuracy is improved. Thereby, the waste of cardboard is also reduced.

FIG. 1 is a perspective view showing a schematic configuration of a processing apparatus for cardboard according to one embodiment of the present invention. FIG. 2 is a view for explaining the detailed structure of the holder portion. FIG. 3 is a view for explaining a process of forming a groove having a substantially V-shaped cross section by the processing apparatus for corrugated board according to the embodiment, wherein (a) shows a state in which the holder portion is in the standby position, b) shows a state in which the holder part is lowered toward the position where a groove having a substantially V-shaped cross section is formed, and (c) is a view showing a state in which the cutter blade is inserted into the cardboard. FIG. 4 is a view showing a groove having a substantially V-shaped cross section formed in the cardboard. FIG. 5 is a view showing an example of a cardboard in which a groove having a substantially V-shaped cross section is formed. 6A to 6C are diagrams for explaining a conventional corrugated board processing apparatus and a processing method using the same. 7A to 7C are views for explaining a conventional corrugated board processing apparatus using a rotary blade and a processing method using the same.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a corrugated board processing apparatus 1 according to the present embodiment. As shown in this figure, the corrugated board processing apparatus 1 according to this embodiment includes a processing table 10, a processing head 20, and a control unit 30 including a computer in which a control program is incorporated. On the processing table 10, a corrugated cardboard (corrugated cardboard sheet) 100 to be processed is set. In the present embodiment, a groove 110 having a substantially V-shaped cross section as shown in FIG. 5 (hereinafter sometimes simply referred to as “V-shaped groove”) 110 is formed as a bent portion in the cardboard 100. Typically, reinforced corrugated cardboard that requires such a V-shaped groove 110 in the bent portion is the object to be processed, but it can also be applied to general corrugated cardboard.

  The machining head 20 is supported by the X-axis 11 and the Y-axis 12 and is provided so as to be movable in the vertical and horizontal directions. As shown in FIG. 2, the processing head 20 is provided with a holder support groove 20a along the vertical direction (Z direction). The holder portion 200 is movable along the holder support groove 20a in the vertical direction. Is provided. The machining head 20 is moved in the X direction, the Y direction, and the Z direction by a motor (not shown) that is driven by a command from the control unit 30. As shown in FIG. 2, the holder part 200 is formed in a substantially pentagonal shape in cross section, and is provided with a taper symmetrically provided so as to incline obliquely downward from both outer parts inward in the vicinity of the lower end part. Surfaces 201 and 201 are provided, and guide rails 202 and 202 are provided along the two tapered surfaces 201 and 201.

  Cutter holders 203, 203 are movably provided on the guide rails 202, 202, and the cutter blades 210, 210 are supported by the cutter holders 203, 203. Specifically, each cutter holder 203, 203 is provided with engaging portions 203a, 203a that engage with the guide rails 202, 202 on the inner side near the tapered surfaces 201, 201, and provided on the outer side. The cutter blades 210 and 210 are held by the portions 203b and 203b. At this time, the cutter blades 210 and 210 are supported so that the longitudinal direction thereof extends in the direction along the guide rails 202 and 202, and the blades are formed on the periphery thereof. Therefore, the cutter blades 210 and 210 can be displaced along the guide rails 202 and 202, and the inclination angle of the tapered surfaces 201 and 201 (guide rails 202 and 202) becomes the cutting angle of the cardboard 100. Therefore, in order to form a V-shaped groove having an intersection angle of about 90 degrees, the inclination angle of the tapered surfaces 201 and 201 (guide rails 202 and 202) is 40 to 50 degrees with respect to the surface of the processing table 10 (corrugated cardboard 100). The range is preferably 45 °, and more preferably 45 degrees.

  Reference numeral 205 denotes a sheet pressing member provided at the tip of the lower end portion of the holder portion 200 that is an intersection of the two tapered surfaces 201 and 201, and the tip portion 205a projects downward.

  The holder unit 200 is provided with a cutter blade operating mechanism 220. The cutter blade operation mechanism 220 includes link members 221 and 221 and a link operation member 222. The link members 221 and 221 are formed in a substantially square shape, and are disposed with the inner corners facing downward. The inner ends of the link members 221 and 221 are pivotally supported by the holder part 200 via the first shaft members 221a and 221a. The link members 221 and 221 are centered on the first shaft members 221a and 221a. Both are pivotable downward. Link side long holes 221b and 221b are formed near the outer ends of the link members 221 and 221. The second shaft members 221c and 221c are inserted through the link side long holes 221b and 221b. The second shaft members 221c and 221c are pivotally supported by connecting pieces 203c and 203c provided at the rear portions of the cutter holders 203 and 203, respectively.

  The link operating member 222 is a vertically moving member 222a that can move up and down in a central guide hole 206 that opens to the upper surface of the holder portion 200, guide rods 222d and 222d, and a return that biases each guide rod 222d and 222d upward. It has springs 222e and 222e. The vertical movement member 222a is formed in a substantially T-shaped cross section including a vertical part 222b and a flange part 222c protruding outward from the upper part of the vertical part 222b, and the upper ends of the guide rods 222d and 222d are formed on the flange part 222b. It is connected. The guide rods 222d and 222d are inserted into side guide holes 207 and 207 provided adjacent to the central guide hole 206 and guided up and down. At positions corresponding to the first shaft members 221a and 221a in the vertical portion 222b of the vertical movement member 222a, long operating member side long holes 222f and 222f are formed in the vertical direction. Further, the bent portions of the substantially rectangular link members 221 and 221 are pivotally supported by the vertical portion 222b via the third shaft members 221d and 221d.

  Since the link operation member 222 is provided in this way, for example, the holder unit 200 is lowered by a signal from the control unit 30 until the sheet pressing member 205 of the holder unit 200 contacts the corrugated cardboard 100 to be processed. As a result, the link operation member 222 also moves down together with the holder part 200. On the other hand, after the sheet pressing member 205 comes into contact with the corrugated cardboard 100, the holder part 200 can no longer be lowered, so that only the link operating member 222 is lowered by the control part 30 against the elastic force of the return springs 222e, 222e. The The means for lowering the holder unit 200 and the link operating member 222 by the control unit 30 is not limited. For example, the control unit 30 engages with the holder unit 200 or the link operating member 222, and controls the control unit. It can be operated using a connecting member (not shown) which is connected to a drive shaft of a motor driven by a command from 30 via a gear or the like and moves up and down.

  Next, a method for forming a substantially V-shaped groove (V-shaped groove) by the corrugated board processing apparatus 1 according to the present embodiment will be described. First, the corrugated cardboard 100 to be processed is set on the processing table 10 (the state shown in FIGS. 1 and 3A). Next, driving is started. The position where the substantially V-shaped groove (V-shaped groove) 110 is formed in the cardboard 100 is stored in the control unit 30 in advance, and the control unit 30 moves the machining head 20 to the X axis 11 and the Y axis 12. A predetermined amount is moved along the X and Y directions. At this time, the processing head 20 is set at a raised position separated from the corrugated cardboard 100, and the cutter blades 210 and 210 supported by the holder unit 200 are positions where the distance between the blade edges 211 and 211 is the most separated ( It is a standby position (the position in FIGS. 2 and 3A)).

  When the control unit 30 moves the processing head 20 to a predetermined position in the X direction and the Y direction, the control unit 30 issues a command to lower the holder unit 200 of the processing head 20, whereby the holder unit 200 is changed to FIG. 3. As shown in (b), the descent operation is started toward a predetermined position on the cardboard 100. When the holder part 200 is lowered and the leading end part 205a of the sheet pressing member 205 comes into contact with the surface 101 of the cardboard 100, the holder part 200 cannot be lowered any further, and the lowering operation of the holder part 200 is stopped. Up to this point, the link operation member 222 of the cutter blade operation mechanism 220 is also moved downward together with the holder part 200.

  The control unit 30 performs control so that the link operation member 222 continues to descend. Thereby, the vertical movement member 222a of the link operation member 222 further descends against the elastic force of the return springs 222e and 222e. At this time, since the first shaft members 221a and 221a are pivotally supported by the holder part 200 that cannot be lowered, the positions of the first shaft members 221a and 221a with respect to the holder part 200 do not change. However, since the first shaft members 221a and 221a are inserted into the operating member side long holes 222f and 222f formed in the vertical portion 222b of the up and down moving member 222a of the link operating member 222, the operating member side long holes 222f are inserted. , 222f change in relative position. In other words, the first shaft members 221a and 221a have the operation member side long holes 222f before the start of the lowering operation of only the vertical movement member 222a of the link operation member 222, as shown in FIGS. 3 (a) and 3 (b). , 222f, but when the vertical movement member 222a of the link operation member 222 descends independently of the holder part 200, as shown in FIG. , 22f.

  On the other hand, the bent portions of the link members 221 and 221 are pivotally supported by the vertical portion 222b of the vertical movement member 222a via the third shaft members 221d and 221d. Therefore, the link members 221 and 221 rotate downward about the first shaft members 221a and 221a, that is, one pivots clockwise and the other counterclockwise. When the link members 221 and 221 rotate downward, the connecting pieces provided near the outer ends of the link members 221 and 221 are provided at the rear portions of the cutter holders 203 and 203 via the second shaft members 221c and 221c. Since it is pivotally supported by 203c and 203c, the cutter holders 203 and 203 are moved along the guide rails 202 and 202 toward the tip of the lower end of the holder part 200. As the cutter holders 203 and 203 move toward the tip of the lower end of the holder part 200, the distance between the connecting pieces 203c and 203c and the third shaft members 221d and 221d becomes shorter, so the second shaft member 221c and Accordingly, 221c moves in the link side long holes 221b and 221b from the position closer to the outer end in FIG. 3B to the position closer to the inner end as shown in FIG. 3C.

  When the cutter holders 203 and 203 are moved in this manner, the cutter blades 210 and 210 held by the cutter holders 203 and 203 are moved substantially synchronously so that the blade edges 211 and 211 come close to each other. become.

  Since the two cutter blades 210 and 210 are displaced in a direction approaching each other synchronously in this way, an angle of 40 to 50 degrees that is an inclination angle of the tapered surfaces 201 and 201 (guide rails 202 and 202). Then, it is inserted from the surface 101 of the cardboard 100, preferably at an angle of 45 degrees. As shown in FIG. 3C, the two cutter blades 210 and 210 are formed by the cutter blades 210 and 210 when the blade edges 211 and 211 are inserted to a position where they substantially match when viewed in cross section. Each notch intersects. This crossing position (corresponding to the groove center 110a of the V-shaped groove 110 shown in FIG. 4) is a bottom surface 102 in contact with the processing table 10 in the corrugated board 100 when viewed in the cross section of FIG. The position is controlled so as to be shifted by a predetermined amount, usually several mm above.

  If the two cutter blades 210 and 210 are inserted as shown in FIG. 3C, the machining head 20 is moved in the X direction or the Y direction according to a command from the control unit 30. Thereby, the V-shaped groove 110 having a predetermined length is formed along the direction. If the V-shaped groove 110 is formed, first, the link operating member 222 is moved upward by a command from the control unit 30. As the link operation member 222 moves upward, the first shaft members 221a and 221a relatively move from the upper end side to the lower end side of the operation member side long holes 222f and 22f, and the link member 221 and 221 rotates upward from the state shown in FIG. 3 (c) to the state shown in FIG. 3 (b). As a result, the cutter blades 210 and 210 are moved obliquely upward and outward through the cutter holders 203 and 203, detached from the corrugated cardboard 100, and further raised, the cutter portions 210 and 210 are connected to the blade edges 211 and 210, respectively. 211 is displaced until reaching the most distant standby position shown in FIG. In this state, when another V-shaped groove 110 is formed, the machining head 20 is moved to a predetermined position under the control of the control unit 30, and the same process as described above is repeated.

  According to the present embodiment, since the two cutter blades 210, 210 are simultaneously inserted into the corrugated cardboard 100 in an oblique direction, a groove having a substantially V-shaped cross section (V-shaped groove 110) is cut into each of the conventional one side. It can be formed quickly as compared with the configuration in which the is inserted. In addition, since two cutter blades 210 and 210 are used, the durability is improved as compared with a conventional apparatus using only one blade, and further, when a cut is provided on only one side and then a cut is made on the other side. No cardboard escape. Thereby, uncut portions are reduced and machining accuracy is improved.

  The cutter blade operation mechanism 220 is not limited to the structure described above as long as it can operate the cutter blades 210 and 210 in an obliquely downward approaching direction in synchronization. Moreover, if each cutter blade 210,210 is made the structure which produces a micro vibration, it can cut more smoothly. Although the means is not limited, for example, a small motor (not shown) is attached to each link member 221, 221, thereby causing a slight rotation, so that each cutter blade 210, 210 is inclined. Micro vibration can be generated in the direction.

DESCRIPTION OF SYMBOLS 1 Cardboard processing apparatus 10 Processing table 20 Processing head 200 Holder part 210 Cutter blade 220 Cutter blade operation mechanism 221 Link member 222 Operation member for link 100 Corrugated cardboard 110 V-shaped groove 110a Groove center

Claims (4)

A processing apparatus for corrugated board comprising a processing table on which a corrugated cardboard to be processed is supported, a processing head supported to be movable relative to the processing table, and a control unit,
The processing head is
A holder part movable in a direction perpendicular to the processing table;
A pair of cutter blades provided at symmetrical positions in the holder part;
A cutter blade operating mechanism for supporting each cutter blade so that the respective blade tips approach each other by being displaced in an oblique direction from a standby position in which the respective blade tips of the respective cutter blades are separated from each other;
When the control unit controls the holder unit so as to approach the cardboard in the vertical direction, the blade edges of the cutter blades approach and are inserted into the cardboard, and the cutter blades are inserted into the cardboard together. An apparatus for processing corrugated board, wherein the holder portion is controlled so as to move in the surface direction of the corrugated board in the inserted state to form a substantially V-shaped groove. The holder part has a tapered surface provided symmetrically so as to be inclined obliquely downward from the outer side part toward the inner side in the vicinity of the lower end part thereof,
The corrugated board processing apparatus according to claim 1, wherein the cutter blades are movable along the tapered surfaces.   The corrugated board processing apparatus according to claim 1 or 2, wherein the cutter blade operating mechanism is configured to obliquely displace each of the cutter blades at an inclination angle in a range of 40 to 50 degrees with respect to the corrugated board. A processing table on which a corrugated cardboard to be processed is supported, a processing head supported to be movable with respect to the processing table, and a control unit;
The processing head is
A holder part movable in a direction perpendicular to the processing table;
A pair of cutter blades provided at symmetrical positions in the holder part;
Using a processing apparatus for corrugated cardboard provided with a cutter blade operating mechanism for operating the cutter blades so that the blade edges approach each other from a standby position where the blade edges of the cutter blades are separated from each other. A method for processing a corrugated cardboard, wherein a substantially V-shaped groove is formed in the corrugated cardboard,
By the control unit,
A step of moving the holder portion in a direction perpendicular to the cardboard until a sheet pressing member provided at a tip of a lower end thereof contacts the cardboard;
In a state where the cardboard is pressed by the sheet pressing member, the cutter blades are obliquely displaced in the direction in which the blade edges approach each other, and the notches formed by the cutter blades intersect the cardboard. Plugging in until
Forming the substantially V-shaped groove on the cardboard by controlling the step of moving the holder portion in the surface direction of the cardboard and forming the substantially V-shaped groove. A method for processing corrugated cardboard.