WO2016024410A1 - Cut-off device and sheet processing device - Google Patents

Abstract

Provided are a cut-off device and a sheet processing device that can minimize positional displacement of a sheet after cutting. A cut-off device in which a sheet (10) is successively cut along the sheet width direction Y in tandem with the rotation of a first knife cylinder (51) and a second knife cylinder (52), wherein first grip materials (51b), (51c) are provided on the upstream side and downstream side of a first knife (51a) on the outer peripheral surface of the first knife cylinder (51) and second grip materials (52b), (52c) are provided on the upstream side and downstream side of a second knife (52a) on the outer peripheral surface of the second knife cylinder (52); and, while successively cutting the sheet (10) along the sheet width direction Y, the cut-off device holds down sheets (10), (10a) via the first grip materials (51b), (51c) and the second grip materials (52b), (52c).

Description

Cut-off device and sheet processing device

The present invention relates to a cut-off device for cutting a sheet in the width direction and a sheet processing apparatus using the same.

Conventionally, in a cut-off device that cuts a sheet such as cardboard or cardboard sheet in the width direction, two knife cylinders (hereinafter also simply referred to as cylinders) having knives attached to the peripheral surface sandwich the sheet traveling path from above and below. It is arranged like this. In this cutoff device, by rotating each cylinder, both knives are engaged with each other with the sheet traveling path interposed therebetween once per rotation, and a sheet traveling between the cylinders is cut in the width direction (for example, Patent Document 1) reference).

Cut-off device cutting methods include a method called push-cut and a method called shear cutting. Push cutting is a method in which an upper knife and a lower knife are simultaneously engaged in the width direction and the sheet is cut at once in the width direction (hereinafter also referred to as the sheet width direction). Is sequentially cut from one end in the width direction to the other end in the width direction.

The share disconnection will be further described with reference to FIG. As shown in FIG. 9, in the cutoff device to which shear cutting is applied, a spiral upper knife 101A is attached to the outer peripheral surface of the upper knife cylinder 101, and a spiral lower knife 102A opposite to the upper knife 101A is provided. It is attached to the lower knife cylinder 102. The upper knife 101 </ b> A and the lower knife 102 </ b> A are engaged (engaged) at a position facing the traveling path of the sheet 103 and cut into the sheet 103. The positions at which the knives 101A and 102A mesh (hereinafter also referred to as meshing portions) are from one end (here, the right end in FIG. 9) to the other end (here, the figure) as the knife cylinders 101 and 102 rotate. 9 to the left end), the sheets 103 are sequentially cut in the sheet width direction Y.

Therefore, the shear cutting can reduce the load applied to the knife cylinder and the knife compared to the pressing cut in which the upper knife and the lower knife are simultaneously pressed over the entire length, so that the vibration of the knife cylinder and the consumption of the knife can be suppressed. it can. For this reason, as a cut-off device used for a corrugator that manufactures a corrugated cardboard sheet, a shear cutting type is mainly used.

Japanese Patent Laid-Open No. 7-25530

However, the shear cutting type cut-off device has a problem that the posture of the sheet after cutting tends to be uneven. Hereinafter, the reason for this will be described with reference to FIGS. 10A to 10C and FIGS. 11A and 11B.

FIGS. 10A, 10B, and 10C are drawings corresponding to the arrow A in FIG. 9, in which the sheets are arranged in the time series of FIGS. 10A, 10B, and 10C. 10A, 10B, and 10C, the sheet 103 is conveyed in the sheet traveling direction X from right to left, and the upper knife 101A and the lower knife 102A face the sheet traveling path and are in the same direction as the sheet traveling direction X. Rotate opposite to move. That is, the upper knife 101A rotates in the clockwise rotation direction C1, and the lower knife 102A rotates in the counterclockwise rotation direction C2.

While the upper knife 101A and the lower knife 102A are rotated once by the counter rotation, the upper knife 101A and the lower knife 102A are opposed to each other across the sheet traveling path. First, as shown in FIG. A part of the lower knife 102A comes into contact with the upper surface of the sheet 103 and a lower part of the lower knife 102A comes into contact with the lower surface of the sheet 103 to start cutting the sheet 103.
As the rotation of the knife cylinders 101 and 102 proceeds, a part of the upper knife 101A and a part of the lower knife 102A deeply bite into the sheet 103 so that the upper and lower knives 101A and 102A mesh with each other as shown in FIG. 10B. Then, the sheet 103 is partially cut at the meshing portion 200.

Further, as the knife cylinders 101 and 102 further rotate, the meshing becomes deeper as shown in FIG. 10C. As a result, the sheet 103 receives the force F1 from the upper knife 101A toward the sheet traveling direction X and the lower side with the meshing part 200 as a boundary, and the upstream part 103b has the lower knife 102A. The force F2 is applied in the direction opposite to the seat traveling direction X and toward the upper side. That is, the sheet 103 is pushed forward and backward with respect to the sheet traveling direction X by the knives 101A and 102A.

11A and 11B are top views schematically showing a state of sheet cutting by shear cutting, FIG. 11A is a diagram showing a state at the start of cutting, and FIG. 11B is a diagram showing a state at the end of cutting. is there. As shown in FIG. 11A, when the sheet 103 is sequentially cut from the top to the bottom as indicated by the alternate long and short dash line, the sheet 103 receives the above-described pressing forces F1 and F2 sequentially from the top in FIG. 11A. Become. As a result, as shown in FIG. 11B, at the end of cutting, the cut sheet 103a and the sheet 103b have an uneven inclination posture that opens upward. Such an inclined posture may cause problems in the paper machine.

That is, in recent years, even in a box making apparatus that manufactures a box from a corrugated cardboard sheet, a cardboard sheet, or the like, a small box manufacturing apparatus includes a cutoff device. In such a box making apparatus, the production amount of the box can be doubled (2 up) by cutting the sheet in the width direction by a cut-off device during the production line and dividing the sheet into two.
As the cut-off device, the shear cutting type device is superior to the push-cut type device in that the vibration of the knife cylinder and the wear of the knife are suppressed. For this reason, also in the box making apparatus, it is preferable to use a cutoff device of a shear cutting method used in the corrugator.

However, in the box making apparatus, unlike the corrugator, the cutting process by the cut-off apparatus is not the final process, and the folding process is refrained after the cutting process, and the sheet after cutting is held by the holder by the holder and the folding process It is carried into (Folder Gluer part). If the posture and position of the sheet after cutting are not uniform, the position held by the holder becomes unstable, and the position of the sheet carried into the folding process may be out of the normal state. As a result, the end face of the folded cardboard box is displaced (fish tail).
For this reason, further improvement is required in order to adopt a shear cutting type cutoff device in the box making apparatus.

The present invention has been devised in view of the above-described problems, and an object thereof is to provide a cut-off device and a sheet processing apparatus capable of suppressing the positional deviation of a sheet after cutting.

In order to achieve the above object, a cutoff device of the present invention includes a first knife cylinder having a spiral first knife attached to the outer peripheral surface, and a spiral shape opposite to the first knife on the outer peripheral surface. The second knife cylinder to which the second knife is attached is disposed opposite to the sheet traveling path, and the first knife cylinder and the second knife cylinder are rotated opposite to each other in synchronization with each other. As the rotation of the knife cylinder and the second knife cylinder proceeds, the meshing portion of the first knife and the second knife sequentially moves along the sheet width direction, and the sheets are sequentially cut along the sheet width direction. In the cut-off device, the first grip material is provided on the upstream side and the downstream side in the cylinder rotation direction of the first knife on the outer peripheral surface of the first knife cylinder, and the second A second grip material is provided on the upstream side and the downstream side in the cylinder rotation direction of the second knife on the outer peripheral surface of the if cylinder, and when the sheet is sequentially cut along the sheet width direction, the first grip material The sheet is pressed by the second grip material.

It is preferable that air suction means is provided between at least one of the first knife and the first grip material and between the second knife and the second grip material.

It is preferable that guide means for guiding the sheet is provided on the upstream side and the downstream side in the traveling direction of the sheet of the first knife cylinder and the second knife cylinder.

The guide means is configured by arranging a plurality of pairs of feed rollers arranged opposite to each other across the sheet travel path, along the sheet width direction, and the distance between each pair of feed rollers is individually set. It is preferable that the adjustment can be made.

In order to achieve the above object, the sheet processing apparatus of the present invention includes the cut-off device, and conveys a sheet cut in the sheet width direction by the cut-off device to a subsequent processing step by a conveying unit. It is a feature.

According to the cut-off device of the present invention, it is possible to suppress the positional deviation of the sheet when sequentially cutting the sheet along the sheet width direction, and it is possible to eliminate a means for aligning the position of the sheet.

When the cut-off device of the present invention is applied to a sheet processing apparatus, various effects can be obtained. For example, if applied to a box making machine equipped with a cut-off device so that the production volume can be doubled, it is possible to suppress problems such as fishtail caused by sheet misalignment in the subsequent process of the cut-off device. Can do.

In the case where the air suction means is provided, the chips generated when the sheet is cut can be sucked together with the air, so the chips remaining on the surface of the first grip material and the surface of the second grip material It can suppress that a sheet | seat slips with respect to 1 grip material or 2nd grip material. Therefore, the sheet can be stably pressed by the first grip material and the second grip material.

When the guide means for guiding the sheet is provided, the cut sheet is conveyed by the guide means by the first knife cylinder and the second knife cylinder, so that the sheet being cut falls down. The sheet can be conveyed to a subsequent apparatus at a normal position.

The guide means is configured by arranging a plurality of pairs of feed rollers arranged opposite to each other across the sheet travel path along the sheet width direction, and each pair of feed rollers is individually separated by a distance between the rollers. If the sheet width can be adjusted, even if the sheet has uneven thickness in the sheet width direction, the distance between a pair of feed rollers arranged in pairs along the sheet width direction is individually adjusted. By doing so, the pushing amount of the feed roller in the sheet width direction can be made uniform in the width direction, and the sheet can be conveyed stably.

FIG. 1A and FIG. 1B are schematic configuration diagrams of main parts of a cutoff device according to a first embodiment of the present invention, and FIG. 1A is a front view thereof (a view seen from the seat traveling direction) showing a support portion. 101 and 102 are broken views, and FIG. 1B is a view corresponding to the A1 arrow view of FIG. 1A. FIG. 2 is a plan view schematically showing the configuration of the cutoff device according to the first embodiment of the present invention. FIG. 3 is a diagram for explaining the operational effect of the cut-off device according to the first embodiment of the present invention, and is a schematic side view of a main part showing a state in which a cardboard sheet is cut. FIG. 4 is a diagram for explaining the effect of the grid member according to the cutoff device of the first embodiment of the present invention, and is a schematic diagram showing displacement in the sheet width direction of the corrugated cardboard sheet over time. . FIG. 5 is a schematic side view showing an overall configuration of a box making apparatus to which the cutoff device of the first embodiment of the present invention is applied. FIG. 6 is a schematic cross-sectional view showing the configuration of the cutoff device according to the second embodiment of the present invention. 7A and 7B are schematic views showing the configuration of the main part of the cutoff device according to the second embodiment of the present invention. FIG. 7A shows the arrangement of the air suction means, and FIG. 7B shows the knife cylinder and the suction pump. It is sectional drawing which shows the structure of the rotary joint which connects. FIG. 8A and FIG. 8B are schematic views showing the main configuration of the cutoff device according to the third embodiment of the present invention. FIG. 8A is a plan view thereof, and FIG. 8B is a side view thereof. FIG. 9 is a schematic front view showing a configuration of a conventional cutoff device. 10A, 10B, and 10C are schematic diagrams for explaining the problems of the conventional cutoff device, corresponding to the view of the arrow A in FIG. FIG. 10B is a diagram showing the time series in FIG. 10B and FIG. 10C. FIG. 11A and FIG. 11B are schematic views for explaining the problem of the conventional cut-off device, and are top views schematically showing a state of cutting the sheet by shear cutting, and FIG. 11A is a state at the start of cutting FIG. 11B is a diagram showing a state at the end of cutting.

Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. The configurations of the following embodiments can be implemented with various modifications without departing from the spirit thereof.
In the following description, the terms “upstream” and “downstream” are used to refer to the upstream and downstream sides in the seat travel direction X without any particular description.
1A, 1B, 3, 6, and 8B, the grip materials 51b, 51c, 52b, and 52c are hatched, but this does not indicate a cross section, and the grip materials 51b, 51c, 52b, This is to facilitate identification of 52c.

[1. First Embodiment]
A cut-off device according to a first embodiment of the present invention and a box making device (sheet processing device) equipped with the cut-off device will be described with reference to FIGS. 1A to 5.

[1-1. Overall structure of box making equipment]
As shown in FIG. 5, the box making apparatus is provided with a cut-off device 5, and is a 2UP type that doubles the cardboard box 10b by dividing the cardboard sheet 10 into two parts during the manufacturing process. . The overall configuration of the box making machine will be described below with reference to FIG.
In FIG. 5, the process in which a corrugated cardboard sheet is processed into a sheet-like cardboard box (sheet-making sheet material) is made to correspond to the apparatus configuration above the apparatus configuration in each process of the box-making machine. It is appended. From the upstream side, this box-making machine includes a sheet feeding unit 1, a printing unit 2, a sheet discharging unit 3, a die cutting unit 4, a cut-off unit (hereinafter referred to as a cut-off device) 5, a folder gluer unit 6, a counter ejector unit 7 Is provided.

In the sheet feeding unit 1, a large number of plate-like cardboard sheets 10 are carried in a stacked state, and the cardboard sheets 10 are supplied (sheet fed) to the printing unit 2 one by one.
The printing unit 2 includes printing units 2a to 2d having a predetermined number of colors [here, four colors]. In the printing unit 2, ink of each color is sequentially printed on the cardboard sheet 10 conveyed one by one by the conveyance conveyor 8. To do.
The paper discharge unit 3 performs grooving and ruled lines on the corrugated cardboard sheet 10 printed by the printing unit 2, and the die cut unit 4 performs punching and punching of hand holes and air holes. Note that the die cutting unit 4 may perform grooving and ruled lines for creating a specially shaped box. Therefore, both of the paper discharge unit 3 and the die cut unit 4 have a function of grooving and ruled lines.

In the cut-off device 5, the corrugated cardboard sheet 10 is cut along the sheet width direction (direction orthogonal to the sheet running direction X) Y (hereinafter, the cut by the cut-off device 5 is also referred to as cut-off), and the downstream side The cardboard sheet 10a and the upstream cardboard sheet 10a are divided into two. Then, the folder gluer section 6 performs a bending process so that the left and right end portions of the corrugated cardboard sheet 10a are superposed on the back side (downward) by pasting the glue margin on the one end in the left and right direction of the corrugated cardboard sheet 10a thus divided. . As a result, the left and right ends of the folded corrugated cardboard sheet 10a are bonded together with glue, and a sheet-like cardboard box (sheet-making sheet material) 10b is completed.
In addition, in the paper discharge unit 3 or the die cut unit 4, in addition to the upstream end and the downstream end of the corrugated cardboard sheet 10, groove cutting, ruled lines, holes, etc. are formed at predetermined locations on the corrugated cardboard sheet 10a after the cut-off. , Ruled lines, drilling, etc. are performed.

In the counter ejector section 7, the box making sheet material 10b processed in the folder gluer section 6 is counted and stacked on a table (stacker table). When a predetermined number of box-forming sheet materials 10b are stacked, the sheet material group 100 is shipped as a unit batch.

[1-2. Cut-off device configuration]
Hereinafter, the configuration of the cutoff device 5 according to the first embodiment of the present invention will be described with reference to FIGS. 1A to 4.
As shown in FIGS. 1A and 1B, the cutoff device 5 includes a cylindrical first knife cylinder 51 and a cylindrical second knife cylinder 52 that travel along the corrugated sheet 10, 10 a (hereinafter also referred to as a sheet travel path). Are arranged facing each other. The first knife cylinder 51 is disposed vertically above the seat travel path, the second knife cylinder 52 is disposed vertically below the seat travel path, and both the knife cylinders 51, 52 have their shaft portions supporting portions 101, 102. Each is rotatably supported.

A spiral first knife 51 a is attached to the outer peripheral surface of the first knife cylinder 51 along the outer peripheral surface so as to be inclined by a predetermined angle (rake angle) with respect to the bus. On the outer peripheral surface of the second knife cylinder 52, a spiral second knife 52a is attached along the outer peripheral surface with a predetermined angle (rake angle) inclined with respect to the bus.
The direction of the spiral of the second knife 52a is set to be opposite to the direction of the spiral of the first knife 51a. In other words, the inclination of the second knife 52a with respect to the bus is set to an inclination opposite to the inclination of the first knife 51a with respect to the bus.

When the load required for cutting the cardboard sheet 10 is large, the cutting load applied to the knives 51a and 52a at a time is reduced by increasing the rake angle of the knives 51a and 52a. On the other hand, as the rake angle is increased, the spiral shape of the knives 51a and 52a is increased, and the manufacture of the knives 51a and 52a and the attachment to the knife cylinders 51 and 52 become difficult. Therefore, the rake angle is preferably set in the range of 0 to 3 [degree].

Both the first knife cylinder 51 and the second knife cylinder 52 rotate opposite to each other by driving of a driving device (not shown), the first knife cylinder 51 rotates in the rotation direction C1, and the second knife cylinder 51 rotates in the rotation direction C2. . Accordingly, both the knife cylinders 51 and 52 rotate in the sheet traveling direction X in the rotational phase facing the sheet traveling path.
In addition, the rotational drive of the first knife cylinder 51 and the rotational drive of the second knife cylinder 52 are performed in synchronism, and the first knife 51a and the second knife cylinder 52 are rotated only once while the two knife cylinders 51, 52 are rotated once by opposing rotation. The two knives 52a face each other across the sheet 10 to perform shear cutting.

In other words, when the spiral knives 51a, 52a opposite to each other enter the area facing each other with the sheet 10 interposed therebetween, first, they are engaged (engaged) at the right end in FIG. 1A, and as the rotation of the knife cylinders 51, 52 proceeds. The meshing portions of the knives 51a and 52a move to the left end in FIG. 1A. That is, the sheet 10 is sequentially cut along the sheet width direction Y from the right end to the left end, and finally cut into two cardboard sheets 10a.

Further, as shown in FIG. 1B, the cut-off device 5 is provided with a pair of feed rollers 60c and 60d on the upstream side of the knife cylinders 51 and 52 with the sheet travel path interposed therebetween, and on the downstream side of the knife cylinders 51 and 52. A pair of feed rollers 60a and 60b is provided with the sheet travel path in between. The feed rollers 60c and 60d are guide means for guiding the corrugated cardboard sheet 10 before cut-off between the knife cylinders 51 and 52. The feed rollers 60a and 60b are guide means for guiding the cut-off corrugated cardboard sheet 10a to the subsequent folder gluer section 6 (see FIG. 5). Each of the feed rollers 60a to 60d increases the coefficient of friction of its peripheral surface by knurling so that the cardboard sheets 10 and 10a can be stably conveyed.

As a result, the corrugated cardboard sheet 10 before cut-off is fed to the knife cylinders 51 and 52 in a normal posture and a normal transport path while being held between the feed rollers 60c and 60d, and the corrugated cardboard sheet 10a after cut-off is fed to the feed roller 60a. , 60b, and is sent to the subsequent folder gluer section 6 in a normal posture and a normal transport path.

It is preferable that the guide means is composed of a pair of upper and lower feed rollers as in the present embodiment, since the cardboard sheets 10 and 10a can be pinched and stably conveyed.

Without the downstream feed rollers 60a and 60b, the corrugated cardboard sheet 10a whose dimension with respect to the sheet traveling direction X (hereinafter also referred to as depth dimension) is cut off and does not reach the downstream folder gluer section 6, or It tends to fall downward from the normal seat travel path. For this reason, when there is an apparatus in the subsequent stage as in this embodiment, it is particularly preferable to arrange a pair of feed rollers 60a and 60b on the downstream side of the knife cylinders 51 and 52.

Incidentally, in order to perform shear cutting, the knives 51a and 52a are attached to the cylinders 51 and 52 so as to be inclined with respect to the buses of the cylinders 51 and 52 as described above. As shown in the plan view of FIG. 2, the knife cylinders 51 and 52 have their cylinder axes CL1 and CL2 seated so that the inclination is offset and the cardboard sheet 10 can be cut straight along the sheet width direction Y. It is installed in a posture inclined by a predetermined angle θ with respect to the width direction (device width direction) Y. The predetermined angle θ corresponds to the rake angle and is, for example, a minute angle of 1 (degree) (in FIG. 2, the inclination is emphasized and shown as a large inclination so that the inclination can be easily confirmed).

As a result of the inclination of the knife cylinders 51 and 52 and the feed rollers 60a to 60d, the corrugated board sheets 10 and 10a are conveyed obliquely downward in FIG. 2 in accordance with the inclination.
In addition, the code | symbol CO shows the center point in the corrugated cardboard sheet 10 before cut-off, and the position which was the center point before cut-off about the corrugated board sheet 10a after cut-off. Moreover, the code | symbol (A), (B), (C) with the parenthesis after the codes | symbols 10 and 10a has shown the time-sequential order, and the cardboard sheet | seat 10 to which the code | symbol (A) was attached | subjected is the die-cut part 4. It is conveyed to the cut-off device 5 by the conveyor belt 42 wound around the conveyor roll 41 and is in a state marked with a symbol (B), and then cut off and corrugated cardboard sheet 10a marked with a symbol (C) It shows how this happens.
The die cut part 4 on the upstream side of the cut-off device 5 is arranged offset with respect to the cut-off device 5 in anticipation that the corrugated cardboard sheets 10 and 10a are conveyed obliquely.

Here, the grip members 51b, 51c, 52b, and 52c (hereinafter referred to as grip members 51b to 52c), which are the main parts of the present invention, will be described.
As shown in FIGS. 1A and 1B, a grip material 51b is attached to the outer peripheral surface of the first knife cylinder 51 in front of the first knife 51a (downstream in the cylinder rotation direction C1). A grip material 51c is attached to the rear (upstream side in the cylinder rotation direction C1).
Similarly, a grip material 52b is attached to the outer peripheral surface of the second knife cylinder 52 in front of the second knife 52a (on the downstream side in the cylinder rotation direction C2), and behind the second knife 52a (in the cylinder rotation direction C2). A grip material 52c is affixed to the upstream side.

Each of the grip members 51b to 52c is formed in a quadrilateral shape having a constant thickness and a lateral width, and the width dimension (the dimension in the left-right direction in FIG. 1A) is the same dimension as the width dimension of the knives 51a and 51b ( Alternatively, the vertical dimension (the vertical dimension in FIG. 1A) is set longer than the vertical dimension of the knives 51a and 51b by a predetermined length ΔL. Further, the long sides of the grip materials 51b to 52c facing the knives 51a and 52a are formed to follow the spiral shape of the knives 51a and 51b, and the other long sides are parallel to the generatrix of the knife cylinders 51 and 52 when the cylinder is mounted. Both short sides are formed so as to be orthogonal to the bus bar when the cylinder is mounted.
That is, the grip members 51b to 52c are provided in a region having a certain width before and after the knives 51a and 52a and extending over the entire width of the knives.

Even if the knives 51a and 52a are sequentially pushed into the corrugated cardboard sheet 10, the corrugated cardboard sheet 10 has grip materials 51b and 51c provided on the first knife cylinder 51 and the second knife cylinder 52 in front and rear of the knives 51a and 52a. Are respectively held by grip members 52b and 52c. Thereby, as shown to FIG. 11B, it can suppress that the attitude | position of the corrugated cardboard sheet | seat 103a, 103b after cut | disconnecting is disturb | confused.

The grip members 51b to 52c are formed of an elastic body such as synthetic rubber or sponge. The material of the grip materials 51b to 52c is not limited as long as the elastic body has a hardness that does not crush the cardboard sheet 10 when the cardboard sheet 10 is pressed (that is, a hardness lower than that of the cardboard sheet 10). As described above, the grip members 51b to 52c preferably have a hardness that does not crush the corrugated cardboard sheet 10, but may have such a hardness that the corrugated cardboard sheet 10 can be restored to a normal state even if the cardboard sheet 10 is slightly crushed. Furthermore, it is preferable that the grip members 51b to 52c have a friction coefficient so that the cardboard sheets 10 and 10 do not slip on the grip members 51b to 52c.
The thickness dimension D of the grip members 51b to 52c is set in a range of 1 to 10 [mm], for example, and the gap dimension w in the cylinder circumferential direction between the knives 51a and 52a and the grip members 51b to 52c is, for example, 1 The distance d between the tips of the knives 51a and 52a and the outer peripheral surfaces of the grip members 51b to 52c is set within a range of 0 to 3 [mm], for example.

The distance d is set to be larger as the corrugated cardboard sheet 10 is thicker (that is, the grip members 51b to 52c are retracted from the blade edges of the knives 51a and 52a toward the knife cylinders 51 and 52). If the distance d is constant regardless of the thickness of the cardboard sheet 10, the thicker the cardboard sheet 10, the more force is required to hold the cardboard sheet 10 by the grip materials 51b to 52c (in an extreme case, the cardboard sheet 10). Conversely, the thinner the cardboard sheet 10 is, the less force is required to hold the cardboard sheet 10. Therefore, by setting the distance d to an appropriate distance according to the thickness of the corrugated cardboard sheet 10, the corrugated cardboard sheet 10 can be pressed with a constant force regardless of the thickness.
The grip materials 51b to 51c can be changed to appropriate grip materials 51b to 51c in accordance with the thickness, surface roughness, hardness and the like of the corrugated cardboard sheet 10 so that the hardness, wear coefficient, and the above dimensions D, W, d can be changed to appropriate grip materials 51b to 51c. Is preferably removable.

[1-3. Action / Effect]
Hereinafter, the operation and effect of using the grip material will be described with reference to FIGS.
FIG. 3 shows a state in which the corrugated cardboard sheet 10 is being cut by the first knife 51a and the second knife 52a, and the hatched area in FIG. 3 shows the grip materials 51b to 52c in a state where the corrugated cardboard sheet 10 is pressed. The two-dot chain line in FIG. 3 indicates the shape of the grip members 51b to 52c when it is assumed that the corrugated cardboard sheet 10 does not exist. That is, the area between the hatched area and the two-dot chain line in FIG. 3 indicates an area where the grip members 51b to 52c are crushed by the corrugated sheet 10 by a reaction force when the corrugated sheet 10 is pressed.

Thus, while the grip materials 51b to 52c are crushed, the cardboard sheet 10 is harder than the grip materials 51b to 52c, so the cardboard sheet 10 is not crushed.
The grip materials 51b to 52c can elastically deform the cardboard sheet 10 without crushing it, and can firmly press the cardboard sheet 10 while closely contacting the cardboard sheet 10 and exhibiting a frictional force.

The corrugated cardboard sheet 10 is pressed by the grip material 51b and the grip material 52b on the downstream side of the meshing portion of the knives 51a and 52a, and the grip material 51c and the grip material 52c are pressed on the upstream side of the meshing portion. The situation where the two corrugated cardboard sheets after the cut-off are inclined with respect to the meshing portion as shown in FIG. 11B is suppressed.
Further, the corrugated cardboard sheet 10 is supported at two points on the downstream side between the start of the cut-off and the end of the cut-off by nipping by the feed rollers 60a and 60b and nipping by the grip materials 51b and 52b. The gripping members 51c and 52c and the feeding rollers 60c and 60d support the two points. Therefore, by providing the feed rollers 60a to 60d in addition to the grip materials 51b to 52c, the inclination of the cardboard sheet can be more effectively suppressed.

The cut-off corrugated cardboard sheet 10a is gripped by a holder (conveying means) (not shown) and transported to the subsequent folder gluer section (following processing step) 6. However, since the posture of the corrugated cardboard sheet 10a is stable, The position where the corrugated cardboard sheet 10a is gripped, and thus the position where the cardboard sheet 10a is carried into the folder gluer section 6, is stabilized. Thereby, the fishtail resulting from the shift | offset | difference of the carrying-in position to the folder gluer part 6 can be suppressed.

In addition, when the cardboard sheet 10 is pressed by the grip materials 51b to 52c, the cardboard sheet 10 is not crushed, so that the product quality is not deteriorated.
Further, since shear cutting is employed, the cutting load can be reduced as compared with pushing cutting, so that the life of the knives 51a and 52a can be extended and vibration of the cylinders 51 and 52 can be suppressed. it can.

As described above with reference to FIG. 2, the cut-off device of the present invention causes the knife cylinders 51 and 52 (here, the feed rollers 60a to 60d) to be inclined with respect to the sheet width direction Y due to shear cutting. Therefore, the corrugated cardboard sheets 10 and 10a are also transported while being displaced with respect to the sheet width direction Y.
FIG. 4 is a diagram showing measurement results of displacement in the sheet width direction Y during conveyance of such cardboard sheets 10 and 10a. The horizontal axis represents time t, and the vertical axis represents a predetermined position C0 of the cardboard sheets 10 and 10a. The position in the sheet width direction Y of (see FIG. 2) is shown.
Then, subscripts A, B, and C at times t _A , t _B , and t _C in FIG. 4 correspond to A, B, and C in parentheses after numerals 10 and 10a in FIG. . For example, time t _A in FIG. 4 indicates the time at which the corrugated cardboard sheet 10 is at the position of the corrugated cardboard sheet 10 denoted by reference numeral (A) in FIG.

If the posture of the corrugated cardboard sheets 10 and 10a is disturbed by the cut-off device 10, the conveyance is also disturbed. However, in the cut-off device 5 of the present invention, the posture of the corrugated cardboard sheets 10 and 10a is normal by the grip materials 51b to 52c. kept the state, further feed rollers 60a ~ 60c by cardboard sheet 10, 10a (in particular corrugated sheet 10a after short cutoff of the depth), so is stably transported, time as shown in FIG. 4 t _a , T _B and t _C , the position in the sheet width direction of the cardboard sheets 10 and 10a is continuously changed without being disturbed.

[2. Second Embodiment]
The cut-off device according to the second embodiment of the present invention is obtained by adding air suction means to the cut-off device 5 according to the first embodiment as will be described later. used.
[2-1. Cut-off device configuration]
Hereinafter, this cutoff device will be described with reference to FIGS. 6, 7 </ b> A, and 7 </ b> B. In addition, the same code | symbol is attached | subjected about the component same as 1st Embodiment, and the description is abbreviate | omitted.
The cut-off device includes a first knife cylinder and a second knife cylinder that are opposed to each other across the sheet travel path, similarly to the cut-off device 5 of the first embodiment. However, in FIG. 6 and FIG. Only the second knife cylinder 52A below the seat travel path is taken out and shown. Since the first knife cylinder and the second knife cylinder have the same configuration, the configuration will be described with the second knife cylinder 52A as a representative.

As shown in FIG. 6 and FIGS. 7A and 7B, the grip material between the lower knife 52a and the front grip material 52b (downstream in the rotational direction C2) and the rear knife 52a and rear (upstream in the rotational direction C2). A gap B having a predetermined dimension is provided between the lower knife 52a and the lower knife 52a. In the gaps B on both sides of the lower knife 52a, a plurality of suction holes (air suction means) 53 are arranged in parallel over the entire length of the lower knife 52a with a predetermined interval.

Each suction hole 53 passes through the cylindrical peripheral wall surface of the second knife cylinder 52A, and is connected to a conduit 54 disposed inside the second knife cylinder 52A. Furthermore, a suction manifold 55 extending in the cylinder axial direction is provided inside the second knife cylinder 52A, and each conduit 54 is connected to the suction manifold 55 in a communicating state.
Further, the suction manifold 55 is connected to a hollow portion 57 a in the shaft portion 57 of the second knife cylinder 52 </ b> A through a conduit 56 in a communicating state.

The insertion portion 58b attached to the distal end of the suction passage 58a is inserted into the enlarged diameter portion 57b at the distal end of the shaft portion 57. A plurality of bearings 59b are arranged between the enlarged diameter portion 57b and the insertion portion 58b. A seal material 59a that seals between the enlarged diameter portion 57b and the insertion portion 58b is provided on one side (here, the shaft portion 57 side) of the bearing 59b, and the other side (here, Then, a bearing stopper 59c is provided on the suction passage 58a side. That is, the shaft portion 57 and the suction passage 58a are rotatably connected by a rotary joint including the enlarged diameter portion 57b, the insertion portion 58b, the bearing 59b, the seal material 59a, and the bearing stopper 59c.

The suction passage 58 a is connected to the suction pump 58. The suction pump 58 includes a fan 58b and a filter 58c inside and an exhaust port 58d.
When the suction pump 58 is operated and the fan 58b is rotated while the second knife cylinder 52A is rotating (during cutting of the cardboard sheet 10), the suction force generated by the operation of the suction pump 58 is applied to the suction passage 58a and the shaft portion 57. , Acting on each suction hole 53 of the second knife cylinder 52A via the conduit 56, the suction manifold 55 and the conduit 54. Accordingly, air is sucked from the suction holes 53, and the cut powder (paper powder) 11 of the corrugated cardboard sheet 10 attached to the grip materials 52b and 52c is sucked together with the air.
In the process in which the mixture of air and cutting powder 11 passes through the filter 58c in the suction pump 58, the cutting powder 11 is removed and collected in the suction pump 58, and the air is discharged from the exhaust port 58d.

If the size of the gap B provided between the lower knife 52a and the grip members 52b and 52c and the respective opening areas of the suction holes 53 are too small, the cutting powder 11 is clogged, and conversely if it is too wide. The suction power per unit area will drop. Therefore, the dimension of the gap B and the opening areas of the suction holes 53 are appropriately set within a range in which the cutting powder 11 is not clogged and the cutting powder 11 can be sucked stably.

Further, in the present embodiment, the first knife cylinder and the second knife cylinder have the same configuration, and suction holes (suction means) are provided in front of and behind the knife in both the first knife cylinder and the second knife cylinder. However, suction holes (suction means) may be provided in front of and behind the knife only in one of the first knife cylinder and the second knife cylinder. When it is provided in one of the knife cylinders, the cutting powder 11 is preferably provided in the second knife cylinder because it is likely to accumulate in the lower second knife cylinder.

[2-2. Action / Effect]
When the cutting powder 11 adheres to the grip materials 52b and 52c, the friction coefficient of the surfaces of the grip materials 52b and 52c is lowered, and the cardboard sheet is likely to slip on the grip materials 52b and 52c. It is also conceivable to install a dust collector in the cut-off device and collect the cutting powder 11 with this dust collector. However, since various parts are arranged inside the apparatus, it is difficult to lay out the dust collector near the grip materials 52b and 52c, and other parts inside the apparatus are cut by the dust collector. 11 is an obstacle to suction. For this reason, the cutting powder 11 cannot be sufficiently removed from the grip materials 52b and 52c by suction using a dust collector.

On the other hand, in the cutoff device of the present embodiment, the cutting powder 11 can be removed from the grip materials 52b and 52c by the suction holes 53 provided in the knife cylinder 52A itself in the vicinity of the grip materials 52b and 52c. Accordingly, it is possible to stably convey the corrugated cardboard sheet by pressing the grip materials 52b and 52c while suppressing a decrease in the friction coefficient of the grip materials 52b and 52c due to the attachment of the cutting powder 11.

In addition, the operator's workload can be reduced as compared with the case where the operator performs the cleaning work of the cutting powder 11 by stopping the cut-off device, and the cutting powder 11 can be collected during operation of the cut-off device and the box making apparatus. . Therefore, since the cutting powder 11 is cleaned, it is not necessary to stop the apparatus, and the operating rate of the apparatus is improved.
Moreover, since it can reduce that the cutting powder 11 disperses around, a working environment can be kept clean.

[3. Third Embodiment]
[3-1. Cut-off device configuration]
The cut-off device 5B of the third embodiment of the present invention is configured as shown in FIGS. 8A and 8B, and is used in place of the cut-off device 5 in the box making apparatus of the first embodiment of FIG. .
In the cut-off device 5 of the first embodiment, as shown in FIG. 2, one feed roller 60a to 60d having a width dimension substantially equal to the width dimension of the knife cylinders 51 and 52 is arranged in the sheet width direction Y. It had been. In contrast to the cut-off device 5 of the first embodiment, in the cut-off device 5B of the present embodiment, the feed rollers 61a to 64b having a width slightly shorter than half of the knife cylinders 51 and 52 are provided in the sheet width direction Y. A plurality (two in this case) are arranged.

Specifically, on the downstream side of the knife cylinders 51 and 52, a pair of feed rollers 61a and 61b that face each other across the sheet travel path, and a pair of feed rollers 62a and 62b that face each other across the sheet travel path. They are arranged along the direction Y. Similarly, on the upstream side of the knife cylinders 51 and 52, a pair of feed rollers 63a and 63b facing each other across the sheet travel path, and a pair of feed rollers 64a and 64b facing each other across the sheet travel path are seat widths. They are arranged along the direction Y.
Each pair of feed rollers is rotatably supported by separate support portions, and is configured such that the gap dimension S between the rollers can be adjusted separately. That is, the feed rollers 61a and 61b can adjust the gap size S between them, the feed rollers 62a and 62b can adjust the gap size S between them, and the feed rollers 63a and 63b can have a gap size between them. The feed rollers 64a and 64b are configured such that the gap dimension S between them can be adjusted so that S can be adjusted.

Here, although two pairs of feeding rollers are arranged in the sheet width direction Y, the number of pairs is not limited to two as long as it is a plurality of pairs, and may be three pairs or four pairs, for example.
Similarly to the second embodiment, a suction hole (suction means) 3 may be provided between at least one of the knife cylinders 51 and 52 between the knife and the grip material.

[3-2. Action / Effect]
Some corrugated cardboard sheets 10 are not uniform in thickness in the sheet width direction Y, for example, with different thicknesses on the left and right. When only one pair of feed rollers in the sheet width direction Y as in the first embodiment is used for such a corrugated cardboard sheet 10, the gap between the feed rollers is constant, so that the corrugated cardboard sheet 10 is pushed by the feed rollers. There is a possibility that the cardboard sheet 10 cannot be conveyed straight because the pressure and the conveying force are not uniform in the sheet width direction Y depending on the sheet thickness.

In the cut-off device 5B of this embodiment, even when handling the corrugated cardboard sheet 10 having different thicknesses on the left and right (sheet width direction Y), the gap dimension S between the pair of feed rollers 61a and 61b and the pair of feed rollers 62a, The gap dimension S of 62b can be set to be different, or the gap dimension S of the pair of feed rollers 63a and 63b and the gap dimension S of the pair of feed rollers 64a and 64b can be set to be different. As a result, the pressing force of the feed roller and the conveying force can be made uniform in the sheet width direction Y even for the corrugated cardboard sheets 10 having different thicknesses on the left and right.

[4. Others]
In each of the above-described embodiments, the example in which the sheet processing apparatus to which the cut-off apparatus of the present invention is applied is a corrugated sheet box making apparatus is described, but the present invention is not limited to this.

The sheet in the present invention is not limited to a corrugated cardboard sheet, and includes cardboard, plastic film, and various thin plate-like sheets.
Therefore, for example, the cut-off device of the present invention can be applied to the cut-off of cardboard, and the sheet processing device of the present invention can be applied to a cardboard box-making device.

Further, the shapes and arrangements of the first grip material and the second grip material are not limited to the arrangements of the above-described embodiments. For example, a grip material smaller than each of the embodiments is arranged in the direction of the knife cylinder or around the knife cylinder. You may make it arrange | position with a predetermined space | interval in a direction (or both the bus-bar direction and circumferential direction of a knife cylinder).
In short, the shape and arrangement of the first grip material and the second grip material are the same as the first grip material 51b and the second grip material from when the cutting of the corrugated cardboard sheet 10 is started by the knives 51a and 52a until the cutting is completed. 52 b may be used as long as the cardboard sheet 10 can be pressed (sandwiched) with 52 b to prevent displacement of the cardboard sheet 10.
In addition, when arranging a plurality of grip materials at a predetermined interval, in addition to between the knives 51a and 51b and the grip material, the cutting powder is collected between the grip materials (the above-mentioned predetermined interval). A suction hole 53 may be provided.

In the above embodiment, the grip members 51b to 52c are configured to be attached to the smooth circumferential surfaces of the cylinders 51 and 52. However, a concave portion is provided on the circumferential surfaces of the cylinders 51 and 52, and the grips are formed in the concave portions. The materials 51b to 52c may be fitted, and an appropriate method other than pasting can be used to fix the grip materials 51b to 52c to the cylinders 51 and 52.

In the above embodiment, the thickness of the grip members 51b to 52c is constant, but the thickness may be varied in a single grip member. For example, when handling the corrugated cardboard sheet 10 whose thickness changes in the left and right (sheet width direction Y), the right and left areas of a single grip material according to the change in the left and right thickness of the corrugated cardboard sheet 10 The thickness may be different. Thereby, it becomes possible to make the force which presses a sheet | seat by a grip material uniform with respect to the corrugated cardboard sheet 10 from which thickness differs on right and left. Of course, a plurality of grip materials having different thicknesses may be arranged side by side in the left-right direction according to changes in the left-right thickness of the cardboard sheet 10.

Furthermore, in the said embodiment, it was set as the structure which attaches one knife to the knife cylinders 51 and 52, respectively, and cuts off the corrugated-cardboard sheet | seat 10 for the knives 51a and 51b to mesh | engage once per rotation. Instead of such a configuration, a plurality of knives are attached to the knife cylinders 51 and 52 while being shifted in the circumferential direction, and the knife engages a plurality of times while the cylinders 51 and 52 rotate once to cut off the corrugated cardboard sheet 10. It is good also as a structure. In this case, a grip material may be provided before and after each of the plurality of knives attached to the cylinders 51 and 52.

5 Cut-off device 10 Corrugated cardboard sheet before cut-off 10a Corrugated cardboard sheet after cut-off 51 First knife cylinder 51a First knife 52, 52A Second knife cylinder 52a Second knife 53 Suction holes 60a-60d, 61a, 61b, 62a 62b 63a 63b 64a 64b
Feed roller 51b, 51c, 52b, 52c Grip material

Claims (5)

1. A first knife cylinder having a spiral first knife attached to the outer peripheral surface and a second knife cylinder having a spiral second knife attached to the outer peripheral surface opposite to the first knife travel the seat. Placed across the path,
   The first knife cylinder and the second knife cylinder are synchronously rotated opposite to each other, and the first knife and the second knife are engaged with each other as the rotation of the first knife cylinder and the second knife cylinder proceeds. In the cut-off device in which the part is sequentially moved along the sheet width direction and the sheet is sequentially cut along the sheet width direction,
   A first grip material is provided on an upstream side and a downstream side in the cylinder rotation direction of the first knife on the outer peripheral surface of the first knife cylinder, and in the cylinder rotation direction of the second knife on the outer peripheral surface of the second knife cylinder. The second grip material is provided on the upstream side and the downstream side,
   The cut-off device, wherein the sheet is pressed by the first grip material and the second grip material when the sheet is sequentially cut along the sheet width direction.
2. The cut according to claim 1, wherein air suction means is provided between at least one of the first knife and the first grip material and between the second knife and the second grip material. Off device.
3. The guide means for guiding the sheet is provided on the upstream side and the downstream side in the traveling direction of the sheet of the first knife cylinder and the second knife cylinder, respectively. Cut-off device.
4. The guide means is configured by arranging a plurality of pairs of feed rollers arranged opposite to each other across the sheet travel path, along the sheet width direction, and the distance between each pair of feed rollers is individually set. The cut-off device according to claim 3, wherein the cut-off device is adjustable.
5. A sheet processing apparatus comprising the cut-off device according to claim 3, wherein the sheet cut in the sheet width direction by the cut-off device is conveyed to a subsequent processing step by a conveying unit.

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