JPH08192394A - Rotary cut-off device - Google Patents

Abstract

PURPOSE: To provide a rotary cut-off device, in which rotational inertia of a knife cylinder is reduced so as to downsize a device and of which adjustment is facilitated and of which lifetime is prolonged and with which cutting with high quality is realized. CONSTITUTION: A rotary cut-off device is arranged in a manufacture line of band-shape sheet 5 such as a corrugated board, and the band-shape sheet 5 to be fed is cut at the predetermined length in the direction at the right angle against the feeding direction. A knife 1, which is installed on a knife cylinder 2, is pushed for cutting to the band-shape board 5 rolled for running between an anvil cylinder 4 or a shoe or an anvil drum, which are synchronously driven with each other, and the knife cylinder 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cut-off device which is arranged on a strip-shaped corrugated board sheet production line and cuts corrugated board sheets continuously fed from a preceding process into predetermined lengths.

[0002]

2. Description of the Related Art FIGS. 11A and 11B are schematic structural explanatory views of a conventional corrugated cardboard cut-off device as an example.
The conventional corrugated board cut-off device is located above and below the sheet path line as shown in FIG.
And the lower knife cylinder 12 are provided in a pair, and both cylinders 11 and 12 are rotatably supported by bearings 14 and 15 to frames 13a and 13b standing on both sides of the manufacturing line. The gear 16 fixed to both ends of the upper knife cylinder 11 and the gear 17 fixed to both ends of the lower cylinder 12 are gears having the same shape and the same number of teeth.
12 is configured so as to rotate in synchronization with each other. Reference numeral 18 in the drawing denotes a rotary drive device (electric motor), which is configured to mesh the gear 20 fixed to the motor shaft 19 with the gear 21 fixed to the shaft end of the lower knife cylinder 12 to sequentially transmit the rotation.
In FIG. 11, spiral knives 22 and 23 are mounted on the knife cylinders 11 and 12, and the engaging points of the knives 22 and 23 are sequentially moved in the axial direction of the cylinder once per rotation by the counter rotation, and the intermediate points are set. The corrugated cardboard sheet 5 traveling in the can be cut. In addition to the above examples, there is also a rotary drum shear of a type in which a knife linearly formed on the peripheral surface of the knife cylinder is mounted parallel to the axial direction (not shown).

Based on the above structure, the following operation will be described. In this conventional apparatus, it is necessary to control the upper and lower knife cylinders 11 and 12 to face each other by accelerating and decelerating and rotating at a constant speed in order to accurately cut a corrugated board sheet at a desired predetermined length in accordance with the feeding speed. Therefore, the upper and lower knife cylinders 1
1 and 12 are interlocked and connected to each other via gears 16 and 17 to rotate in opposition to each other, the rotational inertia (GD ² ) of the cylinder becomes very large, and a large load acts on the electric motor 18, which is the driving means. It was necessary to have equipment of high horsepower. As a countermeasure, knife cylinder 11,
It is conceivable that 12 reduces the rotational inertia of the rotating system such as gears 16 and 17, but if the rotational inertia is reduced, the bending rigidity or torsional rigidity of the cylinder will decrease, which may deteriorate sharpness and, in some cases, both knives. Sometimes did not engage correctly and could not be cut. Also knives 22, 2
In order to engage the 3rd gear, it is necessary to set an appropriate preload and clearance, and a backlash removing device or a manufacturing precision and an assembly precision of the component parts are required in the mechanical system. There was a problem that the manufacturing cost rose significantly. Furthermore, since mutual contact or sliding between the knives 22 and 23 is the basic mechanism of this method,
Increasing knife wear is unavoidable and shortens the service life, which increases the frequency of regular and sudden readjustment, edge polishing, and replacement work, resulting in a significant decrease in equipment operation rate, that is, productivity. There was a problem that caused it. As another problem, the conventional corrugated board cut-off device cuts the entire corrugated board sheet in the width direction with the continuous knives 22 and 23, so that the core paper 10 is cut into a string shape at the cut surface as shown in FIG. There is a strong tendency for paper pieces, which are usually called beards, to be generated, and the beards cause various troubles such as sticking to the printing surface and causing uneven printing during printing in the subsequent process.

[0004]

As described above, in the conventional corrugated board cut-off device heretofore used, a pair of knife cylinders are arranged side by side above and below the sheet path line, and when cutting a sheet, a knife fixed to the outer peripheral surface is used. In order to mesh once for one rotation, it is necessary to rotate both cylinders in opposition synchronously. For this reason, gears are provided at both ends of each cylinder so that they mesh with each other. Therefore, the rotational inertia of the knife cylinder (GD ² ) Becomes larger, the rotating inertia of both cylinders as well as the rotating inertia of the connected gears act on the electric motor that is the driving means, and the electric motor becomes large in size.When cutting corrugated cardboard sheets into various sizes, the sheet The control for accelerating and decelerating the rotation of both knife cylinders corresponding to the moving amount of was also difficult. Moreover, for that reason, high technology was required in manufacturing the device. That is, for the knife engagement, it is necessary to set an appropriate preload or a clearance, and a high level of skill and a long adjustment time are required to adjust the setting. In addition, in the mechanical system, in addition to the backlash removal mechanism, it is necessary to make the manufacturing precision of the component parts high, and the manufacturing cost soared. Moreover, since the pair of knives are engaged (engaged) with each other, wear of the knives is unavoidable. In other words, mutual contact and sliding between the knives are the basic mechanism, resulting in large wear of the knives and short life. Become.
For this reason, re-adjustment and re-polishing are required periodically or suddenly, and the operation rate of the apparatus is lowered, which is a factor that hinders productivity. The present invention solves the problems of these conventional devices, and provides a rotary cut-off device in which the rotary inertia of a knife cylinder is small and the device is miniaturized, adjustment is easy, the life is long, and high quality cutting is possible.

[0005]

For this reason, the present invention is directed to a rotary machine which is arranged in a production line for strip-shaped sheets such as corrugated board and cuts the fed strip-shaped sheets at a predetermined length in a direction perpendicular to the feeding. In the cut-off device, the knife mounted on the knife cylinder pushes and cuts the strip-shaped sheet that travels by rolling contact between the anvil cylinder or shoe or anvil drum and the knife cylinder that are synchronously driven separately. Which is a means for solving the problems. Further, according to the present invention, a knife cylinder having a knife edge having a flat blade shape or a saw blade shape with a lead angle on the circumference is rotatably supported, and the knife cylinder is arranged in parallel with the knife cylinder. An anvil cylinder rotatably supported by winding an anvil around the circumference so that the knife gradually engages from one cylinder end to the other cylinder end as the knife cylinder rotates, or instead of the anvil cylinder. The shoe and the anvil that are slidably received by the engaging portion and the anvil that endlessly rotatably stretches the anvil, and the traveling movement amount (length) of the fed sheet are It comprises a measuring means for detecting and a drive system for independently rotating the knife cylinder and the anvil cylinder, and the anvil cylinder or the anvil drum. The shoe and the shoe are connected to the main driving device of the manufacturing line by a line shaft or the like, or are driven to rotate in synchronism with the line speed of the sheet fed by being connected to the independent driving device, or a forced driving device. The knife cylinder is not rotatable and is only rotatable. When the knife cylinder moves to a predetermined cutting length based on the sheet traveling movement amount detected by the measuring means, the knife cylinder cuts at a speed substantially in synchronization with the line speed of the sheet. Depending on the length of the sheet to be cut so as to enter into an operation, it is rotationally driven by being connected to an electric motor and a control device such as a servomotor so as to perform control from acceleration to deceleration or from deceleration to acceleration. The center line of the anvil cylinder or anvil drum and shoe is manufactured with an angle that is equivalent to the lead angle of the knife with respect to the direction perpendicular to the sheet feeding. A cross so that the knife does not follow the line of the joint of the anvil when the anvil is wound on the anvil cylinder with the joint by a non-endless material. In order to engage with each other, the joint portion is formed in parallel with the axis line of the anvil cylinder, at an angle, in a zigzag shape, or in a spiral shape and is wound, and these are means for solving the problem. Furthermore, in the present invention, the ratio L ′ / L of the inner peripheral length L ′ of the anvil wound around the anvil cylinder to the outer peripheral length L of the anvil cylinder is 1 to 1.01 (L ′ / L ≧
As 1), the winding of the anvil is loose, or the anvil wound in the case of an anvil made of an endless material is slidably or relatively rotatable on the circumferential surface with respect to the anvil cylinder. In addition, the knife to be mounted on the knife cylinder is divided, and the divided knife is mounted with a gap of zero between adjacent split knives or by intentionally giving a gap of up to 5 mm. ,
Further, the knife is mounted so as to gradually project from the widthwise end portion to the central portion of the knife cylinder, or the anvil cylinder is formed with a convex crown having a large outer diameter from the widthwise end portion to the central portion. However, these are the means for solving the problems.

[0006]

By the above means, a knife cylinder having a knife edge having a flat blade shape or a saw blade shape with a predetermined lead angle θ mounted on the circumference thereof and rotatably rotatably supported is provided. The knife is arranged in parallel with the knife cylinder, and the anvil is wound around and circumferentially rotatably supported so that the knife gradually engages from one end of the cylinder toward the other cylinder end as the knife cylinder rotates. An anvil cylinder, measuring means for detecting the traveling amount (length) of the fed sheet, and a separate drive device for independently rotating the knife cylinder and the anvil cylinder. The anvil cylinder is connected to the main drive unit of the production line by a line shaft or the like, or is connected to a single drive unit and rotates in synchronism with the line speed of the sheet to be fed. When the knife cylinder is moved and reaches a predetermined cutting length based on the traveling distance of the sheet detected by the measuring means, the sheet length is adjusted so as to start the cutting operation at a speed substantially synchronized with the line speed of the sheet. In order to perform control from acceleration to deceleration or from deceleration to acceleration in accordance with this, the motor is rotationally driven in a configuration connected to an electric motor such as a servo motor and a control device. Positioning the knife with respect to the anvil is a slight abutment or 80 kgf / cm
It is preferable to set with the following light touch. The knife is mounted on the outer circumference of the knife cylinder so as to spirally surround the peripheral surface from the cylinder end with a lead angle. The blades are arranged so as to engage with each other on the connecting line, and the engagement of the knives moves in the cylinder width direction in parallel with the axis along with the rotation of the knife cylinder and the anvil cylinder. As described above, since the knife cylinder and the anvil cylinder, which are arranged above and below the seat path line, are individually driven to rotate separately, a gear for interlocking both cylinders and rotating them in a synchronously opposed manner as in the prior art is not required. Moreover, the cylinder for controlling the acceleration / deceleration of the rotation to cut the corrugated board sheet into a predetermined length may be a knife cylinder on one side. Therefore, the rotary inertia (GD ² ) of the knife cylinder used for cutting can be made much smaller than that of the conventional type, the electric motor as the driving means can be made to have a small output, and a great power saving can be achieved. In addition, the control becomes easy. Moreover, there is no need for the knives to be meshed with each other, and the technology and labor relating to assembly and adjustment can be reduced, and the component parts and the assembly accuracy can be manufactured to some extent rough. Further, since there is no mutual contact or sliding between the knives due to the structure, the blade edges are less worn, and the knives have a longer life. In addition, it is possible to reduce the number of times of regular or sudden readjustment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings. FIGS. 1 to 8 and 10 are explanatory views of the configuration and operation of a rotary cutoff device according to the present invention. The present invention relates to a rotary cut-off device which is arranged on a production line for strip-shaped sheets such as corrugated board and cuts the strip-shaped sheets sequentially fed from a previous step in a width direction, that is, a direction perpendicular to the feeding at predetermined intervals. As a basic configuration, as shown in FIGS. 1 and 2, a knife 1 having a flat blade edge or a saw blade edge is mounted on the circumference with a predetermined lead angle θ, and A knife cylinder 2 that is rotatably supported is arranged in parallel with the knife cylinder 2, and the knife 1 gradually engages from one end of one cylinder toward the other cylinder end as the knife cylinder 2 rotates. An anvil cylinder 4 wound around the circumference and rotatably supported by an anvil cylinder 4, measuring means 6 for detecting a traveling movement amount (length) of the fed sheet 5, and the knife cylinder 2 And Anne And Rushirinda 4 is made to and a separate drive 7,8 rotating work individually each independently.
That is, the anvil cylinder 4 is connected to the main drive unit 8 of the production line by a line shaft or the like, or is connected to a single drive unit so that the anvil cylinder 4 is rotationally driven substantially in synchronization with the line speed of the sheet to be fed. Has become. In the drive device 8 shown in FIG. 2, the anvil cylinder shaft is connected by the timing belt, but it goes without saying that the drive force may be transmitted by connecting gears or the like. Further, in the structure in which the independent drive device 8 is eliminated and the anvil 3 is configured as an endless belt on the anvil cylinder 4 as shown in FIG. 4 to be described later, the seat 5 and the anvil 3 are connected to the seat 5 and the anvil 3 without applying a forcible driving force from the outside of the anvil cylinder 4. Friction between the anvil 3 and the anvil cylinder 4
It is also possible to take a method of following the lap. Further, when the knife cylinder 2 moves to a predetermined cutting length based on the traveling movement amount of the sheet 5 detected by the measuring means 6, the sheet 5 is started so as to start the cutting operation at a speed substantially synchronized with the line speed of the sheet. The electric motor 7 such as a servo motor is controlled so as to control from acceleration to deceleration or from deceleration according to the length.
And is rotationally driven by a configuration that is connected to the control device 9,
Further, the corresponding axial axes of the knife cylinder 2 and the anvil cylinder 4 are arranged on the manufacturing line at an angle θ which is inclined by the lead angle of the knife 1 with respect to the direction perpendicular to the sheet feeding.

As the material of the knife 1, for example, a hardened material of high carbon steel, high speed steel, cemented carbide or a material having a high hardness material on a base material by thermal spraying, plating or various coating methods is preferable. Further, the material of the anvil 3 has relatively high hardness or soft hardness, but lower hardness than the knife, for example, metal materials such as stainless steel and brass are preferable. The use of other low-flexibility substances such as rubber resin is also not restricted. The position of the knife 1 with respect to the anvil 3 is preferably abutted slightly or set with a light touch of 80 kgf / cm or less. The knife 1 is on the outer circumference of the knife cylinder 2,
The anvil 3 mounted on the anvil cylinder 4 has a lead angle and is mounted so as to spirally surround the peripheral surface from the cylinder end.
Is arranged almost immediately below, that is, engaged on the line connecting the axes of both cylinders 2 and 4, and the knife 1 is engaged with the axis of the cylinder width direction as the knife cylinder 2 and the anvil cylinder 4 rotate. Move in parallel with.

The following FIGS. 3 to 4 show the anvil cylinder 4
It is an explanatory view of a shape (state) example of the anvil 3 wound around the
FIG. 3 (A) shows a joint wound in parallel with the axis of the anvil cylinder 4 or in a straight line at a predetermined angle. The angle of the joint with respect to the coaxial core engages with the knife 1. It is formed in a direction opposite to the lead angle of the knife 1 so as not to do so. Next, FIG. 3 (B) shows a zigzag shape of the joint portion of the example of FIG. 3 (A) wound and wound, and FIG. 3 (C) shows a strip anvil 3 spirally formed on the outer peripheral surface of the anvil cylinder 4. It is wrapped around. 4 shows an anvil 3 formed endlessly (endlessly) and attached, FIG. 4 (A) shows a fixedly wound anvil 3, and FIG. 4 (B) shows an anvil cylinder. 4 is provided with a slight slack and is configured to be slidable or relatively rotatable. Figure 5
4B is a functional explanatory view of the example of FIG. 4B, in which the knife 1 engages with the sheet 5, further comes into contact with the surface of the anvil 3 to cut the sheet 5, and then a series of cutting steps of separating from the sheet 5. This is an example in which the peripheral speed difference between the knife 1 and the anvil 3 that occurs in 1 can be corrected. That is, the deviation due to the loosening of the anvil 3 is used as a means to follow the peripheral speed of the knife 1 so as to eliminate the slip of the cutting edge of the knife 1 and the anvil 3. Wear of the knife is reduced, and the life of the knife such as sharpness can be greatly improved (extended). In the case where the independent drive device 8 is eliminated and the anvil 3 is endlessly mounted on the anvil cylinder 4 as described above, since the anvil 3 is driven by the frictional force due to the contact with the seat 5,
The sharpness and the life of the knife can be improved as in the case of the example of FIG.

Next, in FIG. 10, in place of the anvil cylinder 4, there is provided a shoe which receives the anvil 3 at the engaging portion with the knife 1 and receives the pressure of the anvil 3 so as to slidably support the anvil 3.
An example in which is configured to be endlessly rotatable is shown. FIG.
0 (A) to FIG. 10 (C), 1 and 2 are a knife and a knife cylinder, S-1 is a curved surface shoe having a cylindrical curved surface at the engaging portion, and S-2 is S-. 1 can be used as an alternative to the flat shoe, t is anvil 3-
An anvil drum for tensioning 1,3-2,3-3 endlessly, and a stretch roll for adjusting tension of the anvil. In the structure shown in FIG. 10D, a pressure receiving roll r is built in an engaging portion of the shoe S-3 with the knife 1, and both ends thereof are rotatably supported. Although the anvil drum t of this example is rotatable, as in the drive system of the anvil cylinder 4 according to the previous example, the anvil drum t is forcibly driven substantially in synchronization with the traveling speed of the seat 5 and is not driven. A case where the seat 5 and the anvil 3 are brought into contact with each other to be driven can be selected. In this example, shoe S-
Anvils 3-1 and 3-sliding on 1, S-2 and S-3
Engagement with the knife 1 takes place on 2, 3-3, 3-4 and the sheet 5 is cut. In addition, in the example of FIG. 10B, it is shown that the anvil 3-2 can be lengthened to prolong the life of the anvil, as compared with the example of FIG. In the example, a proposal is presented in which the life of the shoe can be further extended by rolling the pressure receiving roll r arranged in the engaging portion.

FIG. 6 is an explanatory view of an example of the state (form) of the knife 1 mounted on the knife cylinder 2. FIG. 6 (A) is a continuous blade, and FIG. 6 (B) is divided into a plurality of knives 1 which are adjacent to each other. A knife installed with a predetermined gap between the knives, and FIG. 6 (C)
6A is a product in which the divided knives 1 of the example of FIG. 6B are attached in contact with each other without a gap, and functions in the same manner as the continuous blade of the example of FIG. 6A, and continuously cuts the entire region into a linear shape. can do. It should be noted that the example illustrated in FIG. 6B is configured such that after the cutting line is intermittently formed, the discontinuous portion is broken and separated by the rotational movement of the knife that has finished cutting, and the non-cutting portion With this method, the whiskers shown in FIG. 9 that frequently occur in the entire cutting, that is, the scraps of paper generated by the core paper 10 being cut off in a string shape at the cut surface can be eliminated. In other words, by breaking and separating a part of the sheet 5, the beard remains connected to one side of the sheet, and the problem of scattering is eliminated. With the above function, the occurrence of whiskers is eliminated, so that in printing in the subsequent process, quality deterioration such as printing unevenness is eliminated, and various troubles that could occur due to scattering of paper scraps to the drive system and the surroundings can be eliminated. .

Next, FIG. 7 shows an example of countermeasures against the reaction force from the sheet 5 which acts in cutting the corrugated cardboard sheet 5, and FIG.
The knife 1 is formed by being gradually projected from the axial end portion of the knife cylinder 2 to the central portion thereof, and is attached, as shown in FIG.
(B) shows an anvil cylinder 4 having a large outer diameter from the end in the axial direction to the central part, that is, formed in a drum shape with a convex crown, both of which show bending deformation generated when a reaction force from the seat 5 is applied. It is considered that the engagement state is absorbed and the engagement state is uniform over the entire cutting line.

Next, FIG. 8 is an explanatory view of an example of rotation control of the knife cylinder 2 equipped with the knife 1. In FIG. 8A, the length S of the sheet to be cut is longer than the rotation peripheral length (πD) of the knife edge. In the case of the length mode, FIG. 8B shows the case of the short mode in which the sheet length S to be cut is shorter than the rotation peripheral length (πD) of the knife blade edge. Seat 5 is knife cylinder 2 together
During the acceleration and deceleration rotation of the blade, cutting is performed at the * mark in the figure that matches the peripheral speed of the knife blade with the traveling sheet speed. It should be noted that the present invention is not limited to the above-mentioned embodiments, and various changes can be made without departing from the scope of the present invention. In addition,
In the embodiment described above, the corrugated cardboard sheet to be cut runs while rolling on the anvil cylinder or the shoe and the anvil drum, and cut by the knife of the knife cylinder arranged above. It goes without saying that the positional relationship of the knives can be reversed.

[0014]

As described in detail above, according to the present invention, since the knife cylinder and the anvil cylinder, which are arranged above and below the sheet path line, are individually driven to rotate by the respective separate driving means, the conventional method is used. As described above, it is not necessary to provide a gear for interlocking both cylinders and rotating them in a synchronously opposed manner.
In other words, the cylinder that controls acceleration / deceleration to cut the running sheet to a predetermined length is only one nice cylinder, and therefore the rotational inertia (GD ² ) of the knife cylinder used for cutting is sufficient.
Can be made much smaller than that of the conventional type, whereby the electric motor, which is the driving means, can be downsized, the power can be greatly saved, and the speed control can be facilitated. Therefore, it is possible to increase the speed, reduce the manufacturing cost and running cost of the apparatus, and improve the dimensional accuracy in sheet cutting. Moreover, fine adjustments such as the combination of knives are not required, and no advanced technology is required for assembly and adjustment.
Also, in connection with the above, the backlash removing mechanism is unnecessary,
The manufacturing cost can be reduced because the component accuracy and the assembly accuracy can be made to some extent rough. Further, since there is no mutual contact or sliding between the knives, the wear of the cutting edge is reduced, and the knife life is extended. As a result, the working time (number of times) associated with regular or sudden readjustment or blade polishing replacement can be shortened, and the operating rate of the apparatus, that is, the productivity can be greatly improved. In addition, the cut surface quality and cut dimension accuracy are improved, and the beard, which is a problem in the past, that is, the generation of chips (paper chips) that occur during cutting, can be eliminated, and print quality deterioration and various other problems can be solved. became.

[Brief description of drawings]

1A and 1B are schematic configuration explanatory views of an embodiment of a rotary cutoff device according to the present invention, in which FIG. 1A is a side sectional view (view from the arrow AA) and FIG. 1B is a front view.

FIG. 2 is a diagram illustrating a basic configuration (control principle) of a rotary cutoff device according to the present invention.

FIG. 3 is an explanatory view of an example of the shape (state) of an anvil to be wound around an anvil cylinder, in which (A) is a joint wound in a straight line parallel to the axis of the anvil cylinder or at a predetermined angle. Here, (B) illustrates the linear joint of the example (A) wound in a zigzag shape, and (C) illustrates an anvil wound in a spiral shape.

FIG. 4 shows the endless anvil wound around (A).
Shows an anvil fixedly wound, and (B) shows an anvil having a slight slack with respect to the anvil so as to be slidable or relatively rotatable.

FIG. 5 is a functional explanatory diagram of the example of FIG. 4 (B).

FIG. 6 State (form) of knife attached to knife cylinder
In the explanatory diagram of the example, (A) is a continuous blade, (b) is a knife formed in a divided shape and a predetermined gap is provided between adjacent knives, (C) is a divided knife of the (B) example It is a figure which shows the state which attached and mutually contacted.

FIG. 7 is an explanatory diagram of measures against deformation of a knife cylinder and an anvil cylinder.

FIG. 8 is an explanatory diagram of an example of rotational operation control of a knife cylinder.

FIG. 9 is a functional explanatory view of a split knife (explanatory diagram for problems of cutting the entire area).

FIG. 10 is a side sectional view showing another configuration example according to the present invention.

11A and 11B are schematic structural explanatory views of a conventional corrugated board sheet rotary cut-off device, in which FIG. 11A is a side sectional view (view from the direction of arrows BB) and FIG.

[Explanation of symbols]

1 Knife 2 Knife Cylinder 3 Anvil 4 Anvil Cylinder 5 Corrugated Cardboard Sheet 6 Traveling Distance Detection (Measurement) Means 7 Rotational Drive (Electric Motor) 8 Rotational Drive 9 Controller 10 Core Paper 13 Frame 14, 15 Bearings S-1, S- 2, S-3 shoe 3-1, 3-2, 3-3, 3-4 endless anvil t anvil drum

Claims (7)

[Claims] 1. A rotary cut-off device, which is arranged in a production line for strip-shaped sheets such as corrugated board and cuts the fed strip-shaped sheets at a predetermined length in a direction perpendicular to the feeding, and is synchronously driven separately. Rotary cut-off device, characterized in that a knife mounted on the knife cylinder pushes and cuts the belt-shaped sheet that rolls between the anvil cylinder or shoe or anvil drum and the knife cylinder. . 2. The rotary cut-off device according to claim 1, wherein a knife cylinder having a flat-edged or saw-edged blade with a lead angle on the circumference is rotatably supported. , Which are arranged parallel to the knife cylinder and are rotatably supported by winding an anvil on the circumference so that the knife gradually engages from one cylinder end to the other cylinder end as the knife cylinder rotates. The anvil cylinder, or the anvil drum, which replaces the anvil cylinder, and the shoe and the anvil, which are slidably received by the same engaging portion and is disposed on the anvil drum, is endlessly rotatably stretched. It is characterized by comprising a measuring means for detecting the traveling amount (length) of the sheet, and a drive system for independently rotating the knife cylinder and the anvil cylinder. Rotary cutoff device. 3. The rotary cut-off device according to claim 2, wherein the anvil cylinder or the anvil drum and the shoe are connected to a main drive device of a production line by a line shaft or the like, or are connected to a single drive device. The sheet is driven to rotate substantially in synchronism with the line speed of the fed sheet, or is only rotatable without a forcible drive device, and the knife cylinder moves and moves the sheet detected by the measuring means. When moving to a predetermined cutting length based on the amount, control is performed from acceleration to deceleration or deceleration to acceleration so that the cutting operation starts at a speed substantially synchronized with the line speed of the sheet, depending on the length of the sheet to be cut. It is connected to an electric motor such as a servo motor and a control device so as to be rotationally driven, and further, the knife cylinder and the anvil cylinder or the anvil cylinder. A rotary cut-off device, characterized in that the building drum and the shoe are arranged on the manufacturing line such that the axes of the building drum and the shoe are inclined by an angle corresponding to the lead angle of the knife with respect to the direction perpendicular to the sheet feeding. 4. The rotary cut-off device according to claim 2, wherein the knife is along a line of a joint of the anvil when the anvil is wound with a joint on a anvil cylinder with a non-endless material. The rotary cut-off device is characterized in that a joint portion is formed in parallel with the axis line of the anvil cylinder, at an angle, in a zigzag shape, or in a spiral shape so as to be crossed and engaged with each other so as to be engaged with each other. 5. The rotary cut-off device according to any one of claims 2 to 4, wherein the ratio L '/ L of the inner peripheral length L'of the anvil wound around the anvil cylinder to the outer peripheral length L of the anvil cylinder is 1. ~ 1.01 (L '/ L ≧ 1) to loosen the winding of the anvil, or in the case of an anvil composed of endless material, the anvil wound can slide on the anvil cylinder on the peripheral surface. Alternatively, a rotary cut-off device characterized by being configured to be rotatable relative to each other. 6. The rotary cut-off device according to claim 2, wherein the knife attached to the knife cylinder is divided, and the divided knife has a zero gap between adjacent divided knives or dare to maximize the gap. A rotor cutoff device characterized by being installed with a gap of up to 5 mm. 7. The rotary cut-off device according to claim 2, wherein the knife is mounted so as to gradually project from the widthwise end portion to the central portion of the knife cylinder, or the anvil cylinder is mounted from the widthwise end portion to the central portion. A rotor cut-off device characterized in that it is formed by attaching a convex crown having a large outer diameter.