WO2018198467A1

WO2018198467A1 - Cutter for cutting process, slotting device, and box making machine

Info

Publication number: WO2018198467A1
Application number: PCT/JP2018/003755
Authority: WO
Inventors: 貴丸山
Original assignee: 三菱重工機械システム株式会社
Priority date: 2017-04-26
Filing date: 2018-02-05
Publication date: 2018-11-01
Also published as: JP2018183839A

Abstract

A cutter for cutting process, a slotting device, and a box making machine, wherein a slotting knife (80A) for cutting a groove in a cardboard sheet (S) through insertion of the same into a gap (103) provided in a slotting knife (82A) is provided with a cutter body (90) that forms an arc, a pair of flat faces (91) that are provided on both sides of the cutter body (90) in the thickness direction and that are parallel to each other, a pair of inclined faces (92) that are provided along the circumferential direction on the outer circumference portion of the cutter body (90) so that a recess (94) is formed in the center portion of the cutter body (90) in the thickness direction, and a pair of relief faces (93) that follow the circumferential direction and bend from the respective ends on the outer circumference sides of the pair of flat faces (91) toward the outside in the radial direction and toward the center portion of the cutter body (90) in the thickness direction.

Description

Cutting tool, slotter device and box making machine

The present invention particularly relates to a cutting tool for grooving a sheet material such as a corrugated cardboard sheet, a slotter device to which the cutting tool is applied, and a box making machine including the slotter device.

A general box making machine manufactures a box (corrugated cardboard box) by processing a sheet material (for example, a corrugated cardboard sheet), and includes a paper feeding unit, a printing unit, a paper discharge unit, a die cut unit, and folding. Part and a counter ejector part. The paper feeding unit feeds cardboard sheets stacked on the table one by one and sends them to the printing unit at a constant speed. The printing unit has a printing unit and performs printing on a cardboard sheet. The paper discharge unit forms a ruled line that becomes a fold line on the printed cardboard sheet and processes a groove forming a flap and a bonding margin piece for joining. The die-cut portion is used to punch a corrugated cardboard sheet on which ruled lines, grooves, and adhesive margins are formed, such as hand holes. The folding part is made by applying the glue to the glue margin, folding it along the ruled line, and joining the glue margin while moving the corrugated cardboard sheet with ruled lines, grooves, glue margins, hand holes, etc. A flat corrugated cardboard box is manufactured. The counter ejector unit stacks corrugated cardboard boxes in which corrugated sheets are folded and glued, sorts them into a predetermined number of batches, and discharges them.

The paper discharge unit of such a box making machine processes a groove formed by a plurality of slotter heads and a glue piece for joining after a plurality of ruled line rolls form a ruled line on a corrugated cardboard sheet. In this case, the slotter head is composed of an upper slotter head and a lower slotter head, and the cutter of the upper slotter head is assembled so as to fit into a gap formed in the outer peripheral portion of the lower slotter head. Therefore, when the sheet material is conveyed between the upper slotter head and the lower slotter head that rotate relative to each other, a groove is processed in the sheet material when the blade of the upper slotter head is fitted into the gap portion of the lower slotter head. .

Examples of such cutting tools include those described in Patent Document 1 below. The cutting tool described in Patent Document 1 includes a blade body, a grooving blade, and a pressing portion. The grooving blade is provided on both side edges along the outer peripheral portion of the blade body, and the pressing portion is provided in each groove. It is arranged on the outer peripheral portion of the cutter body between the cutting blades, and is provided with a projecting end face that projects outward in the radial direction of the cutter body from the cutting edge of the groove cutting blade.

Japanese Patent No. 4915711

Incidentally, the upper slotter head and the lower slotter head are fixed to a rotating shaft that is rotatably supported by the frame, and can be driven and rotated together with the rotating shaft by a driving device. In this case, the upper slotter head and the lower slotter head may vibrate when the vibration of the driving device is transmitted through the rotating shaft. As described above, the slotter head can process the groove in the conveyed sheet material by inserting the blade of the upper slotter head into the gap portion of the lower slotter head. Therefore, if the upper slotter head or the lower slotter head vibrates, the position of the gap between the upper slotter head and the lower slotter head shifts, and the end face of the cutter comes into contact with the end face of the gap, so that the cutting edge is worn or damaged. May occur.

The present invention solves the above-described problems, and provides a cutting tool, a slotter device, and a box making machine that improve durability and processing accuracy by suppressing wear and damage caused by contact of the tool. For the purpose.

The cutting tool of the present invention for achieving the above object is a cutting tool for cutting a grooved sheet material by being fitted in a gap provided in a lower cutting tool. A pair of planes provided on both sides in the thickness direction of the cutter body and parallel to each other, and provided along the circumferential direction so that a recess is formed in an intermediate portion in the thickness direction of the outer periphery of the cutter body. A pair of inclined surfaces, and a pair of flank surfaces along the circumferential direction bent from the outer peripheral side end portion of the pair of flat surfaces toward the radially outer side and the intermediate portion side in the thickness direction of the blade body. It is characterized by comprising.

Therefore, when grooving the sheet material by fitting the cutter body into the gap provided in the lower cutter, first, the outer peripheral portion of the cutter body comes into contact with the surface of the sheet material to the lower cutter. The sheet material is pushed down into the gap, and then the corner of the intersection of the plane and the flank is brought into contact with the end face of the gap to cut the sheet. At this time, since the flank is provided in the outer peripheral portion of the cutter body, even if the cutter body or the lower cutter vibrates, contact between the outer peripheral portion of the cutter body and the end face of the gap portion in the lower cutter is suppressed, The occurrence of wear and breakage due to contact with the blade can be suppressed, and as a result, durability and processing accuracy can be improved.

The cutting tool of the present invention is a cutting tool that performs grooving of a sheet material by inserting an upper cutter into a gap portion, and is arranged in an arc shape with a predetermined interval in the thickness direction. A pair of blade bodies that form the gap portion, a pair of planes that are opposed to the pair of blade bodies in the thickness direction and that are parallel to each other, and a diameter from an outer peripheral side end portion of the pair of planes And a pair of flank surfaces along the circumferential direction that bends in the direction in which the gap portion expands.

Therefore, when grooving the sheet material by fitting the upper cutter into the gap provided in the cutter body, first, the outer peripheral portion of the upper cutter comes into contact with the surface of the sheet material to the cutter body. The sheet material is pushed down into the gap, and then the sheet material is cut by the end surface of the upper cutter coming into contact with the intersection of the flat surface and the flank surface. At this time, since the flank is provided on the outer peripheral portion of the cutter body, even if the upper cutter or the cutter body vibrates, contact between the outer peripheral portion of the upper cutter and the end face of the gap portion in the cutter body is suppressed, The occurrence of wear and breakage due to contact with the blade can be suppressed, and as a result, durability and processing accuracy can be improved.

The cutting tool of the present invention is characterized in that the angle at which the plane and the flank intersect is set to an obtuse angle.

Accordingly, the angle at which the flat surface and the flank face intersect is set to an obtuse angle so that the corner portion where the flat surface and the flank face intersect the lower blade or the outer peripheral portion of the upper blade comes into contact with the surface of the sheet material. It comes in contact with the plane of the upper cutter, and the sheet material can be appropriately cut.

The cutting tool of the present invention is characterized in that the maximum length in the thickness direction of the blade body between the flat surface and the flank is set to 0.01 mm to 1.0 mm.

Therefore, by setting the maximum length in the thickness direction between the flat surface and the flank to the optimum value, when the outer peripheral part of the upper cutter comes into contact with the surface of the sheet material, the outer peripheral edge of the flank properly controls the sheet material. It can hold | maintain and can cut | disconnect a sheet | seat material with high precision.

In the cutting tool of the present invention, the blade body is provided with a corrugated blade on the outer periphery, and the radial length of the flank is set to be larger than the radial length of the blade. It is characterized by that.

Therefore, by setting the blade portion of the blade body to a wave shape and setting the radial length of the flank face to a dimension larger than the radial length of the blade portion, the flank face is cut regardless of the shape of the blade portion of the blade body. It can set to the whole region of a part, and the contact with the outer peripheral part of a cutter body and the end surface of the crevice part in a cutter body can be controlled.

In the cutting tool of the present invention, the blade body is characterized in that a DLC-Si coating is provided at least on the surface of the outer peripheral portion via a nitrided diffusion layer.

Therefore, the wear resistance can be improved by providing the DLC-Si coating on the surface of the blade body through the nitride diffusion layer, and the adhesion between the upper blade and the DLC-Si coating can be improved by the nitride diffusion layer. Can do.

The slotter device according to the present invention includes an upper rotating shaft that is rotatably supported by the frame, a lower rotating shaft that is rotatably supported by the frame and is parallel to the upper rotating shaft, and is fixed to the upper rotating shaft. And an upper slotter head to which an upper cutter for grooving a sheet material is mounted, and a lower slotter head to which a lower cutter having the gap portion that is fixed to the lower rotary shaft and into which the upper cutter is fitted is mounted. , And the cutting tool is applied as the upper cutter.

Therefore, when the groove material of the sheet material is cut by fitting the upper cutter mounted on the upper slotter head into the gap of the lower blade mounted on the lower slotter head, the outer periphery of the upper cutter is first of the sheet material The sheet material is pushed down into the gap portion with respect to the lower cutter by contacting the surface, and then the sheet material is cut by the corner portion of the intersection of the plane and the flank contacting the end surface of the gap portion. At this time, since the flank is provided in the outer peripheral portion of the upper cutter, even if the upper cutter and the lower cutter vibrate, contact between the outer peripheral portion of the upper cutter and the end face of the gap portion in the lower cutter is suppressed, The occurrence of wear and breakage due to contact with the blade can be suppressed, and as a result, durability and processing accuracy can be improved.

The slotter device according to the present invention includes an upper rotating shaft that is rotatably supported by a frame, a lower rotating shaft that is rotatably supported by the frame and parallel to the upper rotating shaft, and is fixed to the upper rotating shaft. An upper slotter head to which an upper cutter for performing grooving processing of a sheet material is mounted; and a lower slotter head to which a lower cutter having the gap portion that is fixed to the lower rotary shaft and into which the upper cutter is fitted is mounted. And the cutting tool is applied as the lower cutter.

Therefore, when grooving the sheet material by inserting the upper cutter into the gap provided in the lower cutter, first, the outer peripheral portion of the upper cutter comes into contact with the surface of the sheet material to the lower cutter. The sheet material is pushed down into the gap, and then the sheet material is cut by the end surface of the upper cutter coming into contact with the intersection of the flat surface and the flank surface. At this time, since the flank is provided in the outer peripheral portion of the lower cutter, even if the upper cutter or the lower cutter vibrates, contact between the outer peripheral portion of the upper cutter and the end face of the gap portion in the lower cutter is suppressed, The occurrence of wear and breakage due to contact with the blade can be suppressed, and as a result, durability and processing accuracy can be improved.

In the slotter device of the present invention, when the upper cutter is inserted into the gap of the lower cutter, an overlapping portion in the thickness direction of the upper cutter and the lower cutter is set, and the radial length of the flank is set. Is characterized by being set to a dimension smaller than 2/3 of the radial length of the overlapping portion.

Therefore, by setting the radial length of the flank to a dimension smaller than 2/3 of the radial length of the overlapping portion in the thickness direction of the upper cutter and the lower cutter, the outer peripheral portion of the upper cutter and the cutter body While contact with the end face of the gap portion can be suppressed, a decrease in cutting accuracy of the sheet material can be suppressed.

The box making machine of the present invention includes a sheet feeding unit that supplies a sheet material, a printing unit that performs printing on the sheet material, a ruled line process on the surface of the sheet material, and a grooving process. A sheet discharge unit having the slotter device to be performed, a folding unit that forms a box body by folding the sheet material and joining ends, and the box bodies are counted and stacked, and then discharged every predetermined number. And a counter ejector section.

Therefore, the printing unit prints the sheet from the paper feeding unit, the ruled line processing and the grooving processing are performed in the paper discharge unit, and the box is formed by folding the folding unit and joining the end portions. Then, stack the boxes while counting the boxes in the counter ejector. At this time, the slotter device performs the grooving processing of the sheet material by fitting the upper cutter into the gap provided in the lower cutter. At the time of this grooving, first the sheet material is pushed down into the gap with respect to the blade body by the outer peripheral portion of the upper blade contacting the surface of the sheet material, and then the end surface of the upper blade is the intersection of the flat surface and the flank The sheet material is cut by touching. At this time, since the flank is provided on the outer peripheral portion of the cutter body, even if the upper cutter or the cutter body vibrates, contact between the outer peripheral portion of the upper cutter and the end face of the gap portion in the cutter body is suppressed, The occurrence of wear and breakage due to contact with the blade can be suppressed, and as a result, durability and processing accuracy can be improved.

According to the cutting tool, the slotter device, and the box making machine of the present invention, it is possible to suppress the occurrence of wear and breakage due to the contact of the blade, and as a result, it is possible to improve the durability and the processing accuracy.

FIG. 1 is a schematic configuration diagram illustrating a box making machine according to the present embodiment. FIG. 2 is a schematic configuration diagram showing the slotter device of the present embodiment. FIG. 3 is a perspective view showing the slotter device. FIG. 4 is a cross-sectional view showing a fitting state between the slodder head and the lower blade in the slotter device. FIG. 5 is a schematic view for explaining the shapes of the upper slotter knife and the lower slotter knife. FIG. 6 is a side view of the main part showing the upper slotter knife. FIG. 7-1 is a side view of a main part showing a first modification of the upper slotter knife. FIG. 7-2 is a side view of the main part showing a second modification of the upper slotter knife. FIG. 7-3 is a side view of the main part showing a third modification of the upper slotter knife. FIG. 7-4 is a side view of the main part showing a fourth modification of the upper slotter knife. FIG. 7-5 is a side view of an essential part showing a fifth modification of the upper slotter knife. FIG. 8 is a schematic view for explaining the shape of the upper slotter knife. FIG. 9 is a schematic diagram illustrating a modification of the slotter device according to the present embodiment. FIG. 10 is a cross-sectional view of an upper slotter knife provided with a coating film. FIG. 11 is a perspective view of the corrugated cardboard sheet before processing. FIG. 12 is a perspective view of the corrugated cardboard sheet after ruled line processing and grooving.

DETAILED DESCRIPTION Exemplary embodiments of a cutting tool, a slotter device, and a box making machine according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

FIG. 1 is a schematic configuration diagram showing a box making machine according to the present embodiment.

In the present embodiment, as shown in FIG. 1, the box making machine 10 manufactures a cardboard box (box) B by processing a cardboard sheet S. The box making machine 10 includes a sheet feeding unit 11, a printing unit 21, a sheet discharging unit 31, a die cut unit 41, and a folding unit 51 that are arranged linearly in a direction D in which the cardboard sheet S and the cardboard box B are conveyed. The counter ejector unit 61 is configured.

The paper feeding unit 11 feeds the cardboard sheets S one by one and sends them to the printing unit 21 at a constant speed. The sheet feeding unit 11 includes a table 12, a front pad 13, a supply roller 14, a suction device 15, and a feed roll 16. The table 12 can be mounted by stacking a large number of cardboard sheets S and is supported so as to be lifted and lowered. The front pad 13 can position the front end position of the cardboard sheets S stacked on the table 12, and a gap through which one cardboard sheet S can pass is secured between the lower end portion and the table 12. . A plurality of supply rollers 14 are arranged in the conveying direction D of the corrugated cardboard sheet S corresponding to the table 12, and when the table 12 descends, the supply roller 14 is at the lowest position among the stacked corrugated cardboard sheets S. The table 12 can be sent forward. The suction device 15 sucks the stacked cardboard sheets S downward, that is, toward the table 12 or the supply roller 14 side. The feed roll 16 can supply the cardboard sheet S sent out by the supply roller 14 to the printing unit 21.

The printing unit 21 performs multicolor printing (in this embodiment, four color printing) on the surface of the cardboard sheet S. In the printing unit 21, four

printing units

21A, 21B, 21C, and 21D are arranged in series, and printing can be performed on the surface of the cardboard sheet S using four ink colors. Each

printing unit

21A, 21B, 21C, 21D is configured in substantially the same manner, and has a printing cylinder 22, an ink supply roll (anilox roll) 23, an ink chamber 24, and a receiving roll 25. A printing cylinder 22 is attached to the outer periphery of the printing cylinder 22 and is rotatably provided. The ink supply roll 23 is disposed so as to be in contact with the printing plate 26 in the vicinity of the printing cylinder 22 and is rotatably provided. The ink chamber 24 stores ink and is provided in the vicinity of the ink supply roll 23. The receiving roll 25 conveys the corrugated cardboard sheet S with the printing cylinder 22 while applying a predetermined printing pressure, and is provided rotatably below the printing cylinder 22. Yes. Although not shown, each

printing unit

21A, 21B, 21C, 21D is provided with a pair of upper and lower feed rolls in the front and rear.

The paper discharge unit 31 has a slotter device, and performs a crease process and a grooving process on the corrugated cardboard sheet S. The paper discharge unit 31 includes a first ruled line roll 32, a second ruled line roll 33, a slitter head 34, a first slotter head 35, and a second slotter head 36.

The first ruled line roll 32 is formed in a circular shape, and a plurality of (four in the present embodiment) are arranged at predetermined intervals in the horizontal direction orthogonal to the conveyance direction D of the corrugated cardboard sheet S, and can be rotated by a driving device (not shown). It has become. The second ruled line roll 33 is formed in a circular shape, and a plurality of (four in this embodiment) are arranged at predetermined intervals in the horizontal direction orthogonal to the conveyance direction D of the corrugated cardboard sheet S, and can be rotated by a driving device (not shown). It has become. In this case, the first ruled line roll 32 arranged on the lower side applies a ruled line process to the back surface (lower surface) of the cardboard sheet S, and the second ruled line roll 33 arranged on the lower side is a first ruled line roll. Similarly to 32, the back surface (lower surface) of the corrugated cardboard sheet S is subjected to ruled line processing, and receiving

rolls

37, 38 are rotatably provided synchronously at an upper position facing the ruled line rolls 32, 33. Yes.

The slitter head 34 and the first slotter head 35 are formed in a circular shape, and a plurality (five in this embodiment) are arranged at predetermined intervals in the horizontal direction orthogonal to the conveyance direction D of the corrugated cardboard sheet S. Can be rotated. The slitter head 34 is composed of a single piece and is provided corresponding to the end in the width direction of the corrugated cardboard sheet S to be conveyed. The end of the cardboard sheet S in the width direction can be cut. The first slotter head 35 is composed of four pieces and is provided corresponding to a predetermined position in the width direction of the corrugated cardboard sheet S being conveyed, and performs grooving at a predetermined position in the corrugated cardboard sheet S. , Paste margin processing can be performed. The second slotter head 36 is composed of four pieces, and is provided corresponding to a predetermined position in the width direction of the corrugated cardboard sheet S to be conveyed, and performs grooving processing at a predetermined position in the corrugated cardboard sheet S. , Paste margin processing can be performed. In this case, the slitter head 34 and the first slotter head 35 are provided so that the lower head 39 can rotate in synchronization with the lower position facing each other, and the second slotter head 36 has the lower head 40 synchronized with the lower position facing each other. And can be rotated.

The die cut part 41 is for punching the cardboard sheet S such as a hand hole. The die cut portion 41 has a pair of upper and lower feed pieces 42, an anvil cylinder 43 and a head cylinder 44. The feed piece 42 conveys the corrugated cardboard sheet S from above and below, and is rotatably provided. The anvil cylinder 43 and the head cylinder 44 are each formed in a circular shape, and can be rotated in synchronization with a driving device (not shown). In this case, the anvil cylinder 43 has an anvil formed on the outer peripheral portion, while the head cylinder 44 has a head and a die formed at predetermined positions on the outer peripheral portion.

The folding unit 51 is formed by folding the cardboard sheet S while moving it in the transport direction D, and joining both end portions in the width direction to form a flat cardboard box B. The folding unit 51 includes an upper conveyor belt 52,

lower conveyor belts

53 and 54, and a molding device 55. The upper conveyor belt 52 and the

lower conveyor belts

53 and 54 sandwich and convey the cardboard sheet S and the cardboard box B from above and below. The forming device 55 has a pair of left and right forming belts and folds each end of the corrugated cardboard sheet S in the width direction while folding it downward. The folding unit 51 is provided with a gluing device 56. The gluing device 56 has a glue gun, and can paste at a predetermined position on the cardboard sheet S by discharging the glue at a predetermined timing.

The counter ejector section 61 is for stacking the cardboard boxes B while counting them, sorting them into a predetermined number of batches, and then discharging them. The counter ejector unit 61 has a hopper device 62. The hopper device 62 has a liftable elevator 63 on which the cardboard boxes B are stacked. The elevator 63 is provided with a front contact plate and a rectifying plate (not shown) as shaping means. A carry-out conveyor 64 is provided below the hopper device 62.

Here, the operation of manufacturing the cardboard box B from the cardboard sheet S by the box making machine 10 of the present embodiment described above will be described. FIG. 11 is a perspective view of the corrugated cardboard sheet before processing, and FIG. 12 is a perspective view of the corrugated cardboard sheet after ruled line processing and grooving.

As shown in FIG. 11, the corrugated cardboard sheet S is formed by gluing a corrugated core 303 between a front liner 301 and a back liner 302. In the corrugated cardboard sheet S, two

folding lines

311 and 312 are formed in the previous process of the box making machine 10. The

folding lines

311 and 312 are for folding the flap when the cardboard box B manufactured by the box making machine 10 is assembled later. Such corrugated cardboard sheets S are stacked on the table 12 of the paper feeding unit 11 as shown in FIG.

A large number of cardboard sheets S stacked on the table 12 in the paper feeding unit 11 are first positioned by the front pad 13 and then lowered by the plurality of supply rollers 14 as the table 12 descends. The cardboard sheet S in the lower position is sent out. Then, the corrugated cardboard sheet S is supplied to the printing unit 21 on a predetermined constant side by the pair of feed rolls 16.

In the printing unit 21, in each of the

printing units

21A, 21B, 21C, and 21D, ink is supplied to the surface of the ink supply roll 23 from the ink chamber 24. When the printing cylinder 22 and the ink supply roll 23 are rotated, ink supply is performed. The ink on the surface of the roll 23 is transferred to the printing plate 26. When the cardboard sheet S is conveyed between the printing cylinder 22 and the receiving roll 25, the cardboard sheet S is sandwiched between the printing plate 26 and the receiving roll 25, and printing pressure is applied to the cardboard sheet S. Thus, the surface is printed. The printed cardboard sheet S is conveyed to the paper discharge unit 31 by a feed roll.

As shown in FIGS. 1 and 12, first, when the corrugated sheet S passes the first ruled line roll 32, the ruled line 322 is formed on the back side of the cardboard sheet S, that is, the back liner 302 side. 323, 324 and 325 are formed. Further, when the cardboard sheet S passes through the second ruled line roll 33, the ruled

lines

322, 323, 324, and 325 are re-formed on the back side of the cardboard sheet S, that is, on the back liner 302 side, as with the first ruled line roll 32. Is done.

Next, when the cardboard sheet S on which the ruled

lines

322, 323, 324, and 325 are formed passes through the slitter head 34, one end 330 is cut at the cutting position 321. Further, when the cardboard sheet S passes through each first slotter head 35,

grooves

331a, 332a, 333a are formed at positions upstream of the ruled

lines

322, 323, 324. At this time, the upstream end 326a is cut at the cutting

positions

327a and 327b of the ruled line 325. Further, when the cardboard sheet S passes through the second slotter head 36,

grooves

331b, 332b, and 333b are formed at positions downstream of the ruled

lines

322, 323, and 324. At this time, the downstream end 326b is cut at the cutting positions 327c and 327d of the ruled line 325, and a glue margin piece (joining piece) 334 is formed. Thereafter, the corrugated cardboard sheet S subjected to the ruled line processing and the grooving processing is conveyed to the die cut unit 41.

When the corrugated cardboard sheet S passes between the anvil cylinder 43 and the head cylinder 44 at the die-cut portion 41,

hand holes

341 and 342 are formed. Then, the cardboard sheet S in which the

hand holes

341 and 342 are formed is conveyed to the folding unit 51.

In the folding unit 51, the corrugated cardboard sheet S is moved in the conveyance direction D by the upper conveyance belt 52 and the

lower conveyance belts

53, 54, and glue is applied to the glue margin piece 334 by the gluing device 56, and then molded. By means of the device 55, it is folded downward with the ruled

lines

322, 324 as the base points. When the folding proceeds to nearly 180 degrees, the folding force increases, and the adhesive margin piece 334 and the end portion of the corrugated cardboard sheet S overlying the adhesive margin piece 334 are pressed and brought into close contact with each other, and both end portions of the corrugated cardboard sheet S are joined. And becomes a cardboard box B. And this cardboard box B is conveyed to the counter ejector part 61, as shown in FIG.

The cardboard box B detected as a non-defective product by the counter ejector unit 61 is sent to the hopper device 62. The cardboard box B sent to the hopper device 62 is stacked on the elevator 63 in a state in which the front end portion in the transport direction D hits the front contact plate and is shaped by the rectifying plate. When a predetermined number of cardboard boxes B are stacked on the elevator 63, the elevator 63 is lowered, and the predetermined number of cardboard boxes B are discharged as one batch by the carry-out conveyor 64, and the subsequent stroke of the box making machine 10. Sent to.

Here, the paper discharge unit 31 having the slotter device of the present embodiment will be described in detail. FIG. 2 is a schematic configuration diagram showing the slotter device of the present embodiment, and FIG. 3 is a perspective view showing the slotter device.

2 and 3, in the paper discharge unit 31, the slotter device 70 performs crease processing and grooving processing on the cardboard sheet S. The slotter device 70 includes a first ruled line roll 32 and a receiving roll 37, a second ruled line roll 33 and a receiving roll 38, a slitter head (upper slitter head) 34, a first slotter head (upper slotter head) 35 and a lower head (lower A slitter head (lower slotter head) 39, a second slotter head (upper slotter head) 36, and a lower head (lower slotter head) 40 are configured.

Each of the upper and

lower roll shafts

71 and 72 is rotatably supported by a frame (not shown), and the four first ruled line rolls 32 are fixed to the lower roll shaft 71 at predetermined intervals in the axial direction. Four receiving rolls 37 are fixed to the upper roll shaft 72 at predetermined intervals in the axial direction. Each of the upper and

lower roll shafts

73 and 74 is rotatably supported by a frame (not shown), and the four second ruled rolls 33 are fixed to the lower roll shaft 73 at predetermined intervals in the axial direction. The four receiving rolls 38 are fixed to the upper roll shaft 74 at predetermined intervals in the axial direction.

In this case, each first ruled line roll 32 and each receiving roll 37, each second ruled line roll 33 and each receiving roll 38 are arranged facing each other in the vertical direction. In addition, each first ruled line roll 32 has a second ruled line roll 33 arranged on the downstream side thereof at a predetermined interval in the horizontal direction. The first ruled line roll 32 and the second ruled line roll 33 are arranged at the same position in the axial direction of the

roll shafts

71 and 73, and the diameter of the second ruled line roll 33 is larger than the diameter of the first ruled line roll 32. It is set small.

Accordingly, the first ruled line roll 32 and the receiving roll 37 are arranged to face each other vertically, and when the corrugated cardboard sheet S enters between the first ruled line roll 32 and the receiving roll 37, the outer periphery of the first ruled line roll 32 The outer periphery of the receiving roll 37 sandwiches the corrugated cardboard sheet S, and a ruled line is formed on the lower surface when the corrugated cardboard sheet S passes between the two. The second ruled line roll 33 and the receiving roll 38 are disposed so as to face each other vertically. When the corrugated cardboard sheet S enters between the second ruled line roll 33 and the receiving roll 38, the outer periphery of the second ruled line roll 33 is The outer periphery of the receiving roll 38 holds the corrugated cardboard sheet S, and when the corrugated cardboard sheet S passes between the two, a ruled line is re-formed on the lower surface. In this case, the cardboard sheet S forms one ruled line by rolling the first ruled line roll 32 and the second ruled line roll 33 at the same position.

The upper and lower slotter shafts (rotating shafts) 75 and 76 are rotatably supported at their respective ends by a frame (not shown). One slitter head 34 and four first slotter heads are mounted on the upper slotter shaft 75. 35 is fixed at a predetermined interval in the axial direction, and five lower heads 39 are fixed to the lower slotter shaft 76 at a predetermined interval in the axial direction. In this case, one lower head (lower head for a slitter head) 39 is arranged corresponding to one slitter head 34, and four lower heads (slotter heads) corresponding to four first slotter heads 35. A lower head 39 is disposed. Each of the upper and

lower slotter shafts

77 and 78 is rotatably supported by a frame (not shown), and the upper slotter shaft 77 has four second slotter heads 36 (36A and 36B) in the axial direction. The four lower heads 40 are fixed to the lower slotter shaft 78 at predetermined intervals in the axial direction.

A slitter knife 79 is fixed to the outer periphery of each slitter head 34, and a slotter knife 80 is fixed to the outer periphery of each of the three first slotter heads 35A. A slotter knife 81 is fixed to the outer periphery. In addition, the three second slotter heads 36A each have a slotter knife 82 fixed to the outer peripheral portion, and the one second slotter head 36B has a slotter knife 83 fixed to the outer peripheral portion.

The slitter head 34 is used for cutting an end, and can cut an end 330 (see FIG. 12) at a cutting position 321. The slitter head 34 is provided with a slitter knife 79 on the entire circumference. Further, the three first slotter heads 35A and the three second slotter heads 36A are used for grooving, and

grooves

331a, 332a, 333a, 331b, 332b, 333b (see FIG. 12). Can be formed. The first slotter head 35A and the second slotter head 36A are provided with

slotter knives

80A and 81A in a part of the circumferential direction. Further, one first slotter head 35B and one second slotter head 36B are disposed at the end portions of the

slotter shafts

75 and 77, and are used for processing glue margin pieces. The paste margin piece 334 (both see FIG. 12) can be formed by cutting 326a and 326b. The first slotter head 35B and the second slotter head 36B are provided with

slotter knives

80B and 81B in part of the circumferential direction.

In this case, the slitter head 34, each first slotter head 35 (35A, 35B), and each lower head 39 are disposed so as to face each other vertically, and each second slotter head 36 (36A, 36B) and each lower head 40 are disposed. Are arranged so as to face each other vertically. In addition, the slitter head 34 and the first slotter heads 35 (35A, 35B) are arranged at a predetermined interval in the horizontal direction on the downstream side of the second ruled line rolls 33, and the first slotter heads 35 (35A, 35B). ), The second slotter heads 36 (36A, 36B) are arranged on the downstream side thereof at a predetermined interval in the horizontal direction. And each 2nd ruled line roll 33, slitter head 34, and each 1st slotter head 35 (35A, 35B) are arrange | positioned in the same position in the axial direction of the

slotter shafts

73 and 76, and each 1st slotter head 35 ( 35A, 35B) and the second slotter heads 36 (36A, 36B) are disposed at the same position in the axial direction of the

slotter shafts

75, 77.

Therefore, when the cardboard sheet S enters between the slitter head 34 and the first slotter heads 35 A and 35 B and the lower head 39, and passes between the two, the cardboard sheet S is edged by the slitter knife 79 of the slitter head 34. Are cut and grooved by the slotter knife 80A of the first slotter head 35A, and the paste margin piece is processed by the slotter knife 80B of the first slotter head 35B. When the cardboard sheet S passes between the first slotter heads 35A and 35B and the lower head 39, the outer periphery of the first slotter heads 35A and 35B is in an area where the

slotter knives

80A and 80B are not provided on the outer periphery. And the outer peripheral portion of the lower head 39. Further, when the cardboard sheet S enters between the second slotter heads 36A and 36B and the lower head 40 and passes between them, the cardboard sheet S is grooved by the slotter knife 81A of the second slotter head 36A. The paste margin piece is processed by the slotter knife 81B of the second slotter head 36B. When the corrugated cardboard sheet S passes between the second slotter heads 36A and 36B and the lower head 40, the outer periphery of the second slotter heads 36A and 36B is in an area where the

slotter knives

81A and 81B are not provided on the outer periphery. And the outer peripheral portion of the lower head 40.

By the way, the slotter heads 35A and

36A form grooves

331a, 332a, 333a, 331b, 332b, and 333b (see FIG. 12) along the conveyance direction D of the corrugated cardboard sheet S. The

slotter knives

80A and 80B are fixed along. On the other hand, since the slotter heads 35B and 36B cut the

end portions

326a and 326b in the direction orthogonal to the conveyance direction D of the corrugated cardboard sheet S to form adhesive margin pieces 334 (both refer to FIG. 12).

Slotter knives

80B and 81B are fixed along the circumferential direction of the outer peripheral portion and along the rotational axis direction.

Hereinafter, the slotter heads 35A and 36A and the

lower heads

39 and 40 will be described in detail, but since both have substantially the same configuration, the first slotter head 35A and the lower head 39 will be described. FIG. 4 is a cross-sectional view illustrating a fitting state between the slodder head and the lower head in the slotter device. In the following description, when simply referred to as the circumferential direction, this circumferential direction is the circumferential direction of the first slotter head 35A. When simply referred to as the axial direction, this axial direction refers to the first slotter head 35A. In the case of simply referred to as the radial direction, this radial direction is the radial direction of the first slotter head 35A. When the thickness direction is referred to, the thickness direction is the plate thickness direction of the slotter knife 80A. When the slotter knife 80A is fixed to the first slotter head 35A, the rotation axis of the first slotter head 35A is used. It is a mind direction.

As shown in FIG. 4, the first slotter head (hereinafter referred to as slotter head) 35A and the lower head 39 are rotatably supported by a frame (not shown), and are arranged facing each other in the vertical direction. The slotter head 35A has a slotter knife 80A fixed to the outer peripheral portion, and the lower head 39 has a slotter knife 82A fixed to the outer peripheral portion. The slotter knife 80A has an arc shape, in this embodiment, a fan shape, and is fixed to one flat portion on the outer peripheral side of the slotter head 35A by a plurality of bolts 83. The slotter knife 80A is fixed to a part of the outer peripheral portion of the slotter head 35A in the circumferential direction, the outer peripheral portion is concentric with the outer peripheral portion of the slotter knife 80A, and is radially outward from the outer peripheral portion of the slotter head 35A. It is in a position protruding by a predetermined length.

On the other hand, the slotter knife 82A is composed of two blade bodies 84 having an arc shape, in this embodiment, a ring shape. In the slotter knife 82 A, two blade bodies 84 are fixed to one flat surface portion on the outer peripheral side of the lower head 39 by a plurality of bolts 85. The slotter knife 82A is fixed to the entire outer circumferential portion of the lower head 39, and the outer circumferential portion is concentric with the outer circumferential portion of the lower head 39. It is in a position protruding by the length. In the slotter knife 82A, the two blade bodies 84 are fixed to the lower head 39 at a predetermined interval in the thickness direction to form a gap 103.

The slotter head 35A and the lower head 39 are arranged at positions where the outer peripheral portions do not come into contact with each other when mounted on the frame. On the other hand, the slotter knife 80A and the slotter knife 82A are arranged at positions where the outer peripheral portions overlap in the thickness direction when mounted on the slotter head 35A and the lower head 39. That is, when the slotter knife 80A and the slotter knife 82A coincide with each other in a predetermined rotation region in the slotter head 35A and the lower head 39, a part of the outer peripheral portion of the slotter knife 80A constitutes two cutter bodies 84 constituting the slotter knife 82A. Insert between. For this reason, the axial positions of the slotter knife 80A and the gap 103 match. The thickness of the slotter knife 80A is set to be slightly smaller than the axial length of the gap 103.

Here, the shape of the slotter knife 80A and the slotter knife 82A will be described in detail. FIG. 5 is a schematic diagram for explaining the shapes of the upper slotter knife and the lower slotter knife, FIG. 6 is a side view of the main part showing the upper slotter knife, and FIGS. 7-1 to 7-5 are views of the upper slotter knife. It is a principal part side view showing a modification.

The slotter knife 80A functions as a cutting tool for grooving the corrugated cardboard sheet S by being fitted into a gap 103 provided in a slotter knife 82A as a lower cutter. As shown in FIGS. 5 and 6, the slotter knife 80 A includes a blade body 90, a pair of flat surfaces 91, a pair of inclined surfaces 92, and a pair of relief surfaces 93.

The blade body 90 has a fan shape (arc shape), and is provided with a pair of flat surfaces 91 that are parallel to each other on both sides in the thickness direction. The cutter main body 90 is provided with a pair of inclined surfaces 92 along the circumferential direction so that a concave portion 94 is formed at an intermediate portion in the thickness direction at the outer peripheral portion. The pair of inclined surfaces 92 are surfaces along the circumferential direction that bend from the outer peripheral side of the cutter body 90 to the center side in the pair of planes 91, and are set at an acute angle (less than 90 degrees) with respect to each plane 91. . In the blade body 90, a recess 94 is formed along the circumferential direction in the middle portion in the thickness direction of the outer peripheral portion by the pair of inclined surfaces 92.

Further, the cutter body 90 is provided with a pair of flank surfaces 93 along the circumferential direction that bends from the outer peripheral side end portions of the pair of flat surfaces 91 toward the radially outer side and the intermediate portion side in the thickness direction of the cutter body 90. It has been. The blade body 90 has symmetrical shapes on both sides in the thickness direction with the concave portion 94 as a fulcrum, and a blade edge 95 along the circumferential direction is formed on each side by a flat surface 91, an inclined surface 92, and a relief surface 93, respectively. ing. Each blade edge 95 is set to have the same outer diameter in the circumferential direction.

On the other hand, the slotter knife 82A functions as a cutting tool for grooving the corrugated cardboard sheet S by inserting a slotter knife 80A as an upper cutter into the gap 103. The slotter knife 82 A includes a pair of blade main bodies 84, a pair of outer peripheral surfaces 101, a pair of flat surfaces 102, and a gap portion 103.

The pair of blade main bodies 84 have a ring shape (arc shape) and are arranged at a predetermined interval in the thickness direction. The pair of blade main bodies 84 are provided with a pair of flat surfaces 102 that are parallel to each other at positions facing each other in the thickness direction. The blade body 84 has an acute angle (less than 90 degrees) formed between the tangent line of the outer peripheral surface 101 having a curved shape and the flat surface 102. Therefore, the pair of blade main bodies 84 are provided with a gap 103 having a predetermined interval between the pair of flat surfaces 102, and the gap 103 has the same shape along the circumferential direction.

In the above-described embodiment, each blade edge 95 provided on the blade body 90 is formed in an arc shape in which the outer diameter is set to the same diameter in the circumferential direction, but is not limited to this shape. For example, as shown in FIG. 7A, a notched portion 96 having a curved shape on the outer peripheral portion may be used as a cutting edge 97 having a wave shape provided at predetermined intervals in the circumferential direction. In this case, it is desirable that the radial length of the flank 93 is set to be larger than the radial length of the cutting edge 97.

In addition, the inclined surface 92 of the slotter knife 80A has a planar shape and a triangular shape with the recessed portion 94 recessed, but is not limited to this shape. For example, as shown in FIG. 7-2, each inclined surface 92a has an arc shape that is recessed inward, and as shown in FIG. 7-3, each inclined surface 92b has an arc shape that protrudes outward. Or you may. In this case, as shown in FIG. 7-4, a circular arc shape in which the inclined surfaces 92c forming the recesses are continuous may be used. Further, as shown in FIG. 7-5, a groove 98 along the circumferential direction may be formed at the intersection of each inclined surface 92. In this case, the groove 98 has a polygonal cross-sectional shape or a semicircular cross-sectional shape. For example, each inclined surface 92 may have an arc shape.

Next, the flank 93 will be described in detail. FIG. 8 is a schematic view for explaining the shape of the upper slotter knife.

The slotter knife 80A is arranged so that a part of the outer peripheral portion overlaps the outer peripheral portion of the slotter knife 82A in the thickness direction. As shown in FIG. 8, on the line connecting the axial center position of the slotter head 35A to which the slotter knife 80A is attached and the axial center position of the lower head 39 to which the slotter knife 82A is attached (slotter knife 80A and slotter knife). If the position of the outer peripheral surface 101 of the slotter knife 82A relative to the plane 91 of the slotter knife 80A is a position P1, the slotter knife 80A and the slotter knife 82A are set to have an overlap length d1 in the radial direction. The flank 93 is a surface that is bent from the outer peripheral side end portion of the flat surface 91 toward the radially outer side and the intermediate portion side of the knife body 90 in the thickness direction, and therefore the position P1 of the flat surface 91 of the slotter knife 80A. The surface is bent from the position P2 shifted from the outer peripheral side by the length d11. The flank 93 intersects the inclined surface 92 on the outer peripheral side, and the angle α is set to an acute angle. Further, the flank 93 intersects with the flat surface 91 on the inner peripheral side, and the angle β is set to be an obtuse angle.

Then, with respect to the length d11 from the position P1 of the flat surface 91 of the slotter knife 80A to the position P2 of one end of the flank 93, the position of the other end of the flank 93 from this position P2, that is, the slotter knife 80A The length d12 to the outer peripheral position is set short. Specifically, when the slotter knife 80A is inserted into the gap 103 of the slotter knife 82A, the overlap length (overlap portion) d1 in the thickness direction between the slotter knife 80A and the slotter knife 82A is set, and the diameter at the flank 93 is set. The direction length d12 is desirably set to a dimension smaller than 2/3 of the overlap length d1. For example, when the overlap length d1 is set from 2 mm to 6 mm, the radial length d12 of the flank 93 is set from 1 mm to 4 mm.

Further, since the flank 93 is bent from the position P2 of the flat surface 91 toward the intermediate portion in the thickness direction, it is separated from the flat surface 102 of the slotter knife 82A contacting the flat surface 91 of the slotter knife 80A by a predetermined angle β. In this way, it is inclined with respect to the plane 91 (plane 102). Therefore, in the slotter knife 80A, the maximum length t in the thickness direction of the knife body 90 between the plane 91 and the flank 93 is set to 0.01 mm to 1.0 mm.

In the above-described embodiment, the flank 93 is provided on the slotter knife 80A side, but the present invention is not limited to this configuration. FIG. 9 is a schematic diagram illustrating a modification of the slotter device according to the present embodiment.

As shown in FIG. 9, the slotter knife 82 A includes a pair of blade bodies 84, a pair of outer peripheral surfaces 101, a pair of flat surfaces 102, and a gap portion 103 as described above. Each blade body 84 is provided with a pair of flank surfaces 104 along the circumferential direction that bends from the outer peripheral side end portions of the pair of flat surfaces 102 toward the radially outer side and the direction in which the gap portion 103 expands. Each blade body 84 has a symmetrical shape on both sides in the thickness direction with the gap portion 103 as a fulcrum, and a blade edge 95 along the circumferential direction is formed by the outer peripheral surface 101, the flat surface 102, and the relief surface 104 on each side. Has been. Each blade edge 95 is set to have the same outer diameter in the circumferential direction.

Note that the flank 104 provided on the slotter knife 82A has substantially the same shape, dimensions, angle and the like as the flank 93 of the slotter knife 80A, and thus the description thereof is omitted.

Also, the slotter knife 80A of the present embodiment has a wear-resistant coating on the surface. FIG. 10 is a cross-sectional view of an upper slotter knife provided with a coating film.

As shown in FIG. 10, the slotter knife 80A is provided with a DLC (tire mon-like carbon) -Si (silicon) coating 112 on the surface of at least the outer peripheral portion, for example, the blade edge 95 with a nitrided diffusion layer 111 interposed therebetween. In this case, the slotter knife 80A is made of alloy steel, the surface thereof is plasma-nitrided, and then a composite treatment for continuously coating the DLC-Si film is performed.

Therefore, as shown in FIG. 3 to FIG. 5, when the cardboard sheet S enters between the slotter head 35A and the lower head 39 and passes between the two, the cardboard sheet S is separated from the slotter knife 80A of the slotter head 35A. Grooving is performed by the slotter knife 82A of the lower head 39. At this time, first, the outer peripheral edge of each cutting edge 95 of the slotter knife 80A comes into contact with the surface of the cardboard sheet S, thereby pushing the cardboard sheet S down into the gap 103 with respect to the outer peripheral surface 101 of the slotter knife 82A. Next, the cardboard sheet S is cut by the flat surface 91 of the slotter knife 80A coming into contact with the flat surface 102 of the slotter knife 82A.

That is, when the outer peripheral edge of each blade edge 95 of the slotter knife 80A comes into contact with the surface of the cardboard sheet S, the outer peripheral edge of the acute blade edge 95 is locked to the surface of the cardboard sheet S and pushed down into the gap 103. The corner portion (position P2 shown in FIG. 8) between the flank 93 and the flat surface 91 of the slotter knife 80A comes into contact with the surface of the cardboard sheet S, and then comes into contact with the flat surface 102 of the slotter knife 82A. Disconnected.

At this time, since the flank 93 is provided on the outer peripheral portion of the cutting edge 95 of the slotter knife 80A, the slotter knife 80A and the slotter knife 82A of the lower head 39 vibrate, so that the positional relationship between the two is slightly shifted. The contact between the blade edge 95 of the slotter knife 80A and the end face of the gap 103 of the slotter knife 82A is suppressed, and the occurrence of wear and breakage due to the contact of the slotter knife 80A and the slotter knife 82A of the lower head 39 is suppressed.

As described above, the cutting tool of the present embodiment is a slotter knife 80A that performs grooving processing of the corrugated cardboard sheet S by fitting into the gap 103 provided in the slotter knife 82A, and has an arc shape. A concave portion 94 is formed in the blade body 90, a pair of flat surfaces 91 provided on both sides in the thickness direction of the blade body 90 and parallel to each other, and an intermediate portion in the thickness direction in the outer peripheral portion of the blade body 90. A pair of inclined surfaces 92 provided along the circumferential direction and a circumferential direction that bends from the outer peripheral side end of the pair of flat surfaces 91 toward the outer side in the radial direction and the intermediate side in the thickness direction of the cutter body 90. A pair of flank surfaces 93 are provided.

Accordingly, when the slotter knife 80A is inserted into the gap 103 provided in the slotter knife 82A to perform grooving of the cardboard sheet S, the slotter knife 80A comes into contact with the surface of the cardboard sheet S when the slotter knife 80A contacts the surface of the cardboard sheet S. The cardboard sheet S is pushed down into the gap 103 with respect to the knife 82 A, and the corner of the intersection of the plane 91 and the flank 93 contacts the plane 102 of the gap 103, thereby cutting the cardboard sheet S. At this time, since the flank 93 is provided on the outer peripheral portion of the slotter knife 80A, even if the slotter knife 80A or the slotter knife 82A vibrates, the outer peripheral portion of the slotter knife 80A and the end face of the gap portion 103 in the slotter knife 82A. And the occurrence of wear and breakage due to contact with the slotter knife 80A can be suppressed, and as a result, durability and processing accuracy can be improved.

In the cutting tool for cutting according to this embodiment, the angle at the position P2 where the flat surface 91 of the slotter knife 80A and the flank 93 intersect is set to an obtuse angle. Accordingly, after the outer peripheral portion of the slotter knife 80A comes into contact with the surface of the cardboard sheet S, the corner portion where the flat surface 91 and the flank 93 intersect each other comes into contact with the flat surface 102 of the slotter knife 82A. Can be cut into pieces.

In the cutting tool of this embodiment, the maximum length in the thickness direction of the cutter body 90 between the flat surface 91 and the flank 93 is set to 0.01 mm to 1.0 mm. Therefore, by setting the maximum length in the thickness direction between the flat surface 91 and the flank 93 to an optimum value, when the outer peripheral portion of the slotter knife 80A comes into contact with the surface of the cardboard sheet S, the outer peripheral end of the flank 93 is The corrugated cardboard sheet S can be properly held, and the corrugated cardboard sheet S can be cut with high accuracy.

In the cutting tool of this embodiment, the outer peripheral portion of the slotter knife 80A has a wave shape, and the radial length of the flank 93 is set to be larger than the radial length of the cutting edge 95. Therefore, regardless of the shape of the blade edge 95 of the slotter knife 80A, the flank 93 can be set over the entire area of the blade edge 95, and the contact between the outer periphery of the slotter knife 80A and the end face of the gap 103 in the slotter knife 82A is suppressed. can do.

In the cutting tool for cutting according to the present embodiment, the DLC-Si coating 112 is provided on the surface of at least the outer peripheral portion of the slotter knife 80A via the nitride diffusion layer 111. Accordingly, the wear resistance can be improved, and the degree of adhesion between the blade body 90 and the DLC-Si coating 112 can be increased by the nitrided diffusion layer 111.

Further, in the cutting tool of the present embodiment, the slotter knife 82A performs the grooving process of the corrugated cardboard sheet S by inserting the slotter knife 80A into the gap portion 103, and has a circular arc shape and a thickness. A pair of blade bodies 84 arranged at predetermined intervals in the direction, a pair of planes 102 that are provided opposite to each other in the thickness direction on the pair of blade bodies 84 and are parallel to each other, and outer peripheries of the pair of planes 102 A pair of flank surfaces 104 are provided along the circumferential direction that bends in the radial direction from the part-side end and toward the direction in which the gap 103 expands.

Accordingly, when the slotter knife 80A is inserted into the gap 103 provided in the slotter knife 82A to perform grooving of the cardboard sheet S, the slotter knife 80A comes into contact with the surface of the cardboard sheet S when the slotter knife 80A contacts the surface of the cardboard sheet S. The cardboard sheet S is pushed down into the gap 103 with respect to the knife 82A, and the cardboard sheet S is cut by contacting the intersection of the flat surface 102 of the slotter knife 80A, the flat surface 102 of the slotter knife 82A, and the flank 104. At this time, since the flank 104 is provided on the outer periphery of the slotter knife 82A, even if the slotter knife 80A or the slotter knife 82A vibrates, the outer surface of the slotter knife 80A and the end surface of the gap 103 in the slotter knife 82A. And the occurrence of wear and breakage due to contact with the slotter knife 82A can be suppressed, and as a result, durability and processing accuracy can be improved.

Further, in the slotter device of the present embodiment, the

upper rotary shafts

75 and 77 that are rotatably supported by the frame, and the lower rotary shaft that is rotatably supported by the frame and is parallel to the

upper rotary shafts

75 and 77. 76, 78, upper slotter heads 35A, 36A to which

slotter knives

80A, 81A for grooving the corrugated cardboard sheet S are fixed and

upper rotary shafts

75, 77, and lower

rotary shafts

76, 78 are fixed. The lower heads 39 and 40 to which the slotter knives 82A having the gaps 103 into which the

slotter knives

80A and 81A are fitted are mounted.

Accordingly, when the

slotter knives

80A and 81A mounted on the upper slotter heads 35A and 36A are fitted into the gap 103 of the slotter knife 82A mounted on the

lower heads

39 and 40, the cardboard sheet S is grooved. Since the flank 93 or the flank 104 is provided on the outer periphery of the

slotter knife

80A, 81A or the slotter knife 82A, the outer periphery of the

slotter knife

80A, 81A even if the

slotter knife

80A, 81A or the slotter knife 82A vibrates. Contact with the end face of the gap portion 103 in the slotter knife 82A can be suppressed, and wear and breakage due to contact of the

slotter knives

80A, 81A and the slotter knife 82A can be suppressed. As a result, durability and processing accuracy can be reduced. Can be improved.

In the slotter device of this embodiment, when the slotter knife 80A is fitted into the gap 103 of the slotter knife 82A, an overlapping portion in the thickness direction between the slotter knife 80A and the slotter knife 82A is set, and the radial length of the flank 93 is set. The length d12 is set to a dimension smaller than 2/3 of the radial length d1 in the overlapping portion. Therefore, the contact between the outer peripheral portion of the slotter knife 80A and the end face of the gap portion 103 in the slotter knife 82A can be suppressed, while the decrease in cutting accuracy of the cardboard sheet S can be suppressed.

In the box making machine of this embodiment, the paper feeding unit 11, the printing unit 21, the paper discharge unit 31, the die cut unit 41, the folding unit 51, and the counter ejector unit 61 are provided. A slotter device 70 is provided. Even when the

slotter knife

80A, 81A or the slotter knife 82A vibrates during operation of the slotter device 70, the contact between the outer peripheral portion of the

slotter knife

80A, 81A and the end face of the gap portion 103 in the slotter knife 82A is suppressed, and the slotter knife 80A. , 81A and the slotter knife 82A can be prevented from being worn or damaged, and as a result, durability and processing accuracy can be improved.

DESCRIPTION OF SYMBOLS 11 Paper feed part 21 Printing part 31 Paper discharge part 34 Slitter head (upper slitter head)
35 1st slotter head (upper slotter head)
35A First slotter head 35B First slotter head 36 Second slotter head (upper slotter head)
36A Second slotter head 36B

Second slotter head

39, 40 Lower head (lower slotter head)
41 Die-cut part 51 Folding part 61 Counter ejector part 70

Slotter device

71, 72, 73, 74

Roll shaft

75, 76, 77, 78 Slotter shaft (rotating shaft)
79

Slitter knife

80, 81, 82, 82A, 83

Slotter knife

80A,

81A Slotter knife

80B, 81B Slotter knife 84 Blade body 90 Blade body 91 Flat surface 92 Inclined surface 93 Flank surface 94 Recessed 95, 97 Cutting edge 101 Outer peripheral surface 102 Flat surface 103 Crevice 104 Flank 111 Nitrided diffusion layer 112 DLC-Si coating S Corrugated cardboard sheet (sheet material)

Claims

In a cutting tool for cutting a sheet material by fitting into a gap provided in the lower cutter,
An arcuate blade body,
A pair of planes provided on both sides in the thickness direction of the blade body and parallel to each other;
A pair of inclined surfaces provided along the circumferential direction so that a recess is formed in an intermediate portion in the thickness direction in the outer peripheral portion of the cutter body;
A pair of flank surfaces along a circumferential direction that bends from an outer peripheral side end in the pair of planes toward an outer side in the radial direction and an intermediate side in the thickness direction of the cutter body;
A cutting tool characterized by comprising:
In the cutting tool for grooving the sheet material by fitting the upper cutter into the gap,
A pair of blade bodies that form an arc shape and are arranged at predetermined intervals in the thickness direction to form the gap portion;
A pair of flat surfaces provided in the pair of blade main bodies so as to face each other in the thickness direction and parallel to each other;
A pair of flank surfaces along a circumferential direction that bends in a direction in which the outer circumferential portion side ends of the pair of planes radially outward and the gap portion expands;
A cutting tool characterized by comprising:
The cutting tool according to claim 1 or 2, wherein an angle at which the plane and the flank intersect is set to an obtuse angle.
4. The maximum length in the thickness direction of the blade body between the flat surface and the flank is set to 0.01 mm to 1.0 mm. 5. The cutting tool according to the description.
The blade body is provided with a corrugated blade portion on an outer peripheral portion, and the radial length of the flank is set to be larger than the radial length of the blade portion. The cutting tool for cutting described in 1.
2. The cutting tool according to claim 1, wherein a DLC-Si coating is provided on at least the outer peripheral surface of the blade body through a nitride diffusion layer.
An upper rotating shaft rotatably supported by the frame;
A lower rotating shaft that is rotatably supported by the frame and is parallel to the upper rotating shaft;
An upper slotter head to which an upper cutter fixed to the upper rotating shaft and performing grooving processing of a sheet material is mounted;
A lower slotter head to which a lower cutter having the gap portion, which is fixed to the lower rotating shaft and into which the upper cutter is fitted, is mounted;
With
The cutting tool according to claim 1 is applied as the upper cutter.
A slotter device characterized by that.
An upper rotating shaft rotatably supported by the frame;
A lower rotating shaft that is rotatably supported by the frame and is parallel to the upper rotating shaft;
An upper slotter head to which an upper cutter fixed to the upper rotating shaft and performing grooving processing of a sheet material is mounted;
A lower slotter head to which a lower cutter having the gap portion, which is fixed to the lower rotating shaft and into which the upper cutter is fitted, is mounted;
With
The cutting tool according to claim 2 is applied as the lower cutter.
A slotter device characterized by that.
When the upper cutter fits into the gap of the lower cutter, an overlapping portion in the thickness direction of the upper cutter and the lower cutter is set, and the radial length of the flank is the diameter of the overlapping portion. The slotter device according to claim 7 or 8, wherein the slotter device is set to a dimension smaller than 2/3 of the directional length.
A sheet feeding unit for supplying sheet material;
A printing unit for printing on the sheet material;
The sheet discharge unit having the slotter device according to any one of claims 7 to 9, wherein the sheet material is subjected to ruled line processing on the surface and grooving processing.
Folding part that forms a box by folding the sheet material and joining the ends,
A counter ejector portion that discharges every predetermined number after the boxes are stacked while counting,
A box making machine characterized by comprising: