JPH03194B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to sheet materials such as paper and synthetic resin sheets, and membrane materials such as films (hereinafter collectively referred to as sheet materials). The present invention relates to a cutting device for a winder, and particularly to a cutting device that cuts a running sheet-like object in a transverse direction.

[Prior Art] A winding machine that winds a continuously fed sheet material, winds it to an appropriate length, cuts it, and then winds it for the next winding is usually equipped with a winder that winds the sheet material that is being fed in a transverse direction. A cutting device will be installed to cut the area.

The cutting devices of conventional sheet winding machines can be roughly divided into those that cut the entire width of a sheet at once using a saw-blade cutter that extends perpendicular to the sheet feeding direction. (Cross cut method)
There is also a method (traverse cut method) in which the cutter is run in a direction perpendicular to the feeding direction of the sheet-like material to cut the sheet-like material diagonally from the end.

[Problems to be Solved by the Invention] Among the above cutting methods, the former cross-cut method cuts the entire width of the sheet material at once, so although the time required for cutting is short, the cutting resistance is large, and the cutting resistance of the sheet material is high. There was a problem in that it applied a large impact to the object, causing various process troubles due to tearing of the sheet-like object and fluctuations in tension. In addition, in the case of a winder, the cut ends of the sheet-like material that are cut all at once lose support for a moment and are wound around the winding core, so the cut ends may become bent or wrinkled. Therefore, the sheet-like material that is continuously wound on the winding core cannot be wound well, and the cut end portion of the winding core causes a large winding loss. Furthermore, the cross-cutting method has a mechanical speed limit, as it becomes more difficult to cut the sheet material properly as the traveling speed of the sheet material increases, and a high cutter speed is required.

On the other hand, the traverse cut method gradually cuts the sheet-like material by running the cutter, so the cutting resistance is low and it is possible to perform good cutting even on the sheet-like material that is traveling at high speed. Since the sheet-like material is cut diagonally and the sheet-like material is lost during cutting, the loss due to cutting is much larger than in the cross-cut method. In order to reduce this loss as much as possible, it is necessary to run the cutter as fast as possible, but there is a mechanical limit to the running speed due to the inertia of the cutter device being moved. In addition, in order to run the cutter at high speed, a certain length is required for the run-up section for the cutter to reach the starting point of cutting the sheet material and the braking section after cutting. However, there was a problem in that the cutting device had to be large in size.

The present invention provides a novel winding machine cutting device that can solve all of the above problems at once.
It is an object of the present invention to cut a sheet-like material with low cutting resistance, a good cut end surface, and excellent cutting performance even at high speed, and to significantly reduce loss due to cutting.

[Means for Solving the Problems] A cutting device for a winder for a sheet-like material according to the present invention that meets this objective has a cutting edge formed in a serrated shape around a rotation center line extending in the transverse direction of the sheet-like material. The blade is rotatably supported in the same direction as the traveling direction of the sheet material so that the trajectory thereof passes through and traverses the traveling trajectory of the sheet material before cutting, and the blade edge formed in the shape of a saw blade is rotated in the direction of rotation. a cutter that extends spirally around the center line of rotation and in the transverse direction of the sheet-like object when the cutter is oriented; a brush made of an elastic body provided on a side surface of the cutter opposite to the center line of rotation; , and a drive means for rotating at a speed faster than the traveling speed of the sheet-like object.

[Function] In such a cutting device, the cutter is driven to rotate together with a rotating shaft arranged on the center line of rotation, and the cutting edge of the cutter penetrates and traverses the traveling sheet-like object, thereby cutting the sheet-like object across the sheet-like object. However, since the cutting edge of the saw-toothed cutter is twisted in a spiral around the rotation axis, the cutting edge of the cutter is cut in the direction of the rotation of the cutter from the tip of the cutting edge in the direction of rotation. Then, the sheet-like material is successively cut in the transverse direction. The time required to cut a sheet-like object is only a short time, which is enough for the cutter to rotate by the arc of the cutter's cutting edge twisted in a spiral around the rotation axis. The sheet-like material is cut diagonally over the entire width of the running length. Even with a saw-blade cutter installed across the entire width of a sheet-like object, it is possible to cut the sheet-like object by installing the cutter in a spiral shape and cutting the sheet-like object by rotation of the cutter. Similar to the traverse cut method, the sheet-like material is cut diagonally over time, so cutting resistance is kept low and a good cut end surface can be obtained by sequentially cutting. By keeping the cutting resistance low, reliable and good cutting performance can be obtained even at high speeds, and the loss of sheet material due to diagonal cutting is limited to the rotation time of the cutter blade, resulting in significantly greater cutting than with the conventional traverse cut method. Loss is reduced. Furthermore, since there is no need for a run-up section and a braking section for the cutter as in the conventional traverse cut method, there is no need to increase the size of the cutting device even in high-speed machines. After cutting, the cut ends of the cut sheet are sequentially pushed toward the winding shaft by a brush provided on the back side of the cutter (the side opposite to the rotational center line), so that the cut ends From then on, the winding is successfully wound around the winding shaft, preventing wrinkles from occurring at the winding end, and winding loss is significantly reduced.

[Embodiments] Hereinafter, preferred embodiments of the cutting device for a sheet winder of the present invention will be described with reference to the drawings.

1 to 4 show a cutting device for a sheet winder according to an embodiment of the present invention. FIG. 1 shows the side surface of the winding section of the winding machine. A sheet-like material 1 that is continuously fed is wound around a winding core 3 into a roll shape while being pressed by a contact roll 2. After long winding, it is turned from the winding position A to the take-out position B. After that, guide roll 4,
The envelope arm 6 on which the cutting device 5 is installed is moved upward around the fulcrum 7 to reach the state shown in FIG. The shaped material 1 is wound around the winding core 3, and the next winding is started.

As shown in FIG. 2, the cutting device 5 extends in the transverse direction of the sheet material 1, and is rotationally driven by a DC motor 8 via a belt 9 and a clutch 10.
Rotating shaft 1 supported at both ends by enveloper arm 6
1 and a cutter 13 that is supported via an arm 12 that is fixed to the rotating shaft 11 at a distance in the axial direction of the rotating shaft 11 and extends in the transverse direction of the sheet-like material 1. ing. Therefore, the rotating shaft 11 becomes the rotation center line of the cutter 13, and the cutter 13 can be rotated together with the rotating shaft 11. The cutter 13 is made of a thin steel plate having a thickness of, for example, 1 mm to 1.2 mm, and has a saw-like cutting edge 14 formed at one edge in the longitudinal direction over the entire length in the longitudinal direction. Katsuta 13 is
With the cutting edge 14 facing the rotational direction of the rotational shaft 11, that is, the rotational direction of the cutter 13, the axis of the rotational shaft 11 is drawn in a spiral shape, that is, an arc around the rotational shaft 11, with a distance of 12 arms from the rotational shaft 11. It is twisted and supported by the arm 12 so as to extend in the direction. Katsuta 13 seen from the Z direction in Figure 2
The positions of the cutter 13 are shown in FIG. 3, and parts a, b, and c of the cutter 13 in FIG. 2 correspond to positions a, b, and c in FIG. 3, respectively. Although the helix angle θ of the cutter 13 was set to 180 degrees in this embodiment, it may be any suitable angle depending on the overall length of the cutter 13 and the like. The installation positions of the cutter 13 and the rotating shaft 11 are such that, as shown in FIG. The trajectory circle 15 of the cutter 13 is arranged so as to cross the running trajectory of the cutter 13, that is, to penetrate and traverse it, and so that the trajectory circle 15 of the cutter 13 does not interfere with the running trajectory of the sheet-like material 1 after the guide roll 4. is set so that it passes very close to the surface of the winding core 3.

In this embodiment, the cutter 13 is made into a single piece, but the cutter 13 may be divided into lengths and may have a connecting structure if necessary. Also, the arm 1 that supports the cutter 13
2 may be increased or decreased in number as necessary. However, in consideration of inertia during rotation, it is desirable that the cutter 13 and the arm 12 be as lightweight and strong as possible; for example, the cutter 13 may be made of thin steel,
The arm 12 is preferably made of reinforced aluminum or the like.

As shown in FIGS. 3 and 4, a brush 16 made of an elastic body is provided near the end of the cutter 13 on the side opposite to the rotating shaft 11 and opposite to the cutting edge 14.
3 It is installed over the entire length. brush 16
The bristles of the brush 16 are installed so that they are planted almost at right angles to the sides of the stubble 13, and the bristles of the brush 16 are
A material with high elasticity and excellent wear resistance is desirable.

The cutter 13 is driven to rotate together with the rotating shaft 11 by a DC motor 8 via a belt 9, a clutch 10, a rotating shaft 11, and an arm 12, and the rotational speed thereof is faster than the traveling speed of the sheet-like material 1. For example, the drive system and the control system for the DC motor 8 are set to be 1.2 to 1.5 times the traveling speed of the sheet-like object 1. Note that the guide roll 4 is driven via a belt 17,
It is derived from the same driving source as the cutter 13.

With the cutting device of the present invention having the above configuration, a sheet-like material is cut in the following manner.

When the sheet-like material 1 is wound up to a predetermined length at the winding position A, the winding core 3 is rotated to the take-out position B, and a new winding core 3 is set at the winding position. Thereafter, the motor 8 is driven to a predetermined rotational speed, the guide roll 4 is driven to the traveling speed of the sheet-like material 1, the enveloper arm 6 is raised, and the guide roll 4 and cutting device 5 are rotated as shown in FIG. is set at a predetermined cutting position. After the cutting device 5 is set at the cutting position, the clutch 10 is operated and the driving force from the DC motor 8 is transmitted to the rotating shaft 11. At the same time as the clutch 10 is actuated, the rotating shaft 1
1. The cutter 13 starts rotating from the rotation start position shown in FIG. As the cutter 13 rotates, the saw blade-like cutting edge 14 is running on the sheet-like object 1.
I cut it. This cutting is performed in the order in which the cutting edge 14 crosses the travel trajectory of the sheet-like material 1 in FIG.
That is, from a to b of the cut part in Fig. 2,
This is done from b to c. The cutter 13 sequentially cuts the sheet-like material 1 in the transverse direction from the end, and since the sheet-like material 1 is traveling even during cutting, the sheet-like material 1 is cut diagonally. By cutting the sheet-like material 1 sequentially from the end, even with saw blade-like cutters provided in the transverse direction of the sheet-like material 1, a large cutting resistance is generated as compared to the conventional cross-cut method that cuts the sheet-like material 1 at once. The sheet-like material 1 is reliably cut with small cutting resistance, and the impact on the sheet-like material 1 due to cutting is extremely small, so various troubles due to impact are prevented, and the same method as the conventional traverse cut method is used. Good cutting performance can be obtained.

Further, in the case of the positional relationship as shown in FIG. Since the speed is set considerably higher than the traveling speed of the object 1, the sheet-like object 1 is reliably cut. Also, Katsuta 13
is supported in the air by an arm 12 at a distance from the rotating shaft 11, and the arm 12 is also made of a lightweight member, so the rotational inertia of the cutter 13 is kept small, and the guide roll 4 is driven by the same drive as the cutter 13. When the clutch 10 is actuated, the flywheel effect of the guide roll 4 is used to drive the cutter 13. Therefore, the cutter 13 is given sufficient rotational speed without running up, and the sheet material can be rotated at a sufficient speed. Good sharpness can be obtained by cutting 1.

Moreover, since the cut sheet-like material 1 is wound around the winding core 3 in order from the cut portion, it is easily and reliably wound due to static electricity or the like. The cut end surface of the sheet-like material 1 immediately after being cut is the fifth
As shown in the figure, when the material is wound around the winding core 3, it is pressed against the surface of the winding core 3 by the brush 16 attached to the side surface of the cutter 13. Since the brush 16 is set faster than the surface speed of the winding core 3 which is synchronized with the speed of the sheet material 1, the brush 16 rubs the upper surface of the cut end surface of the sheet material 1 to remove wrinkles. At the same time, the cut end surface is pressed against the surface of the winding core 3. Since an elastic material is used for the brush 16, the spring effect of the brush 16 further promotes the wrinkle smoothing effect and pressing effect on the cut end surface, and the cut end surface is wound in good condition without bends or wrinkles on the winding core 3. It will be done.

Furthermore, although the cutting line C of the sheet-like material 1 is shown in FIG. 6, the length L of the diagonal cutting in the sheet-like material traveling direction, which causes a loss due to cutting, is the length L of the sheet-like material 1 in the cutting time of the sheet-like material 1 by the cutter 13. This corresponds to the length of the sheet-like material 1, and approximately corresponds to the time it takes for the cutter 13 to rotate by its twist angle θ. The length of the twisted arc of the cutter 13 is sufficiently smaller than the total width of the sheet-like material 1, and the rotational speed of the cutter 13 is sufficiently smaller than the total width of the sheet-like material 1.
Since the cutting speed is set faster than the traveling speed, the cutting loss length can be kept sufficiently small, and is much smaller than the loss length L1 caused by the cutting line D of the conventional traverse cut method, that is, it can be suppressed to about 1/10. . By the way, for sheets with a width of 5m and a running speed of 100m/min or more,
In the conventional traverse cut method, the loss length L1 was required to be at least about 5 m, but with the present invention, the loss length L1 can be suppressed to about 0.5 m, and even if the speed is increased, the rotational speed of the cutter 13 is lower than the sheet material 1. Since the value of the loss length L does not change because it is proportional to the traveling speed of the cutting speed, the cutting loss reduction effect becomes more effective as the speed increases.

[Effects of the Invention] As explained above, the following various effects can be obtained by using the cutting device of the sheet winder of the present invention.

First, a serrated cutter provided in the transverse direction of the sheet-like object is extended in a spiral around the rotation axis with the cutting edge facing the direction of rotation, and the sheet-like object is moved in the transverse direction by the rotation of the cutter. Since the cutting is performed diagonally, cutting resistance can be reduced and a good cut end surface can be obtained, and reliable and good cutting performance can be ensured even at high speeds.

In addition, since the sheet material is cut by rotating the cutter, the cutting time can be significantly shortened compared to the conventional traverse cut method, and the loss length of the sheet material due to cutting can be significantly reduced. Since the run-up section and braking section of the cutter as in the traverse cut method are not required, it is possible to suppress the increase in size of the device even in high-speed machines.

Furthermore, by attaching a brush to the cutter, the end surface of the cut sheet material can be wrapped around the winding core without bending or wrinkles, thereby preventing any negative impact on the sheet material being wound onto the cut end surface. can be removed to significantly increase productivity.

[Brief explanation of the drawing]

FIG. 1 is a partial side view of the cutting device and its surroundings of a sheet winder according to an embodiment of the present invention, FIG. 2 is a perspective view of the cutting device of the device shown in FIG. 1, and FIG. 2
Figure 4 is a partial perspective view of the cutter, Figure 5 is a side view showing the state of cutting and wrapping a sheet-like object, and Figure 6 is a side view of the cutting line of the sheet-like object as seen from the Z direction. FIG. DESCRIPTION OF SYMBOLS 1... Sheet-like material, 3... Winding core, 4... Guide roll, 5... Cutting device, 6... Envelope arm, 8... DC motor, 10... Clutch, 11... Rotation center line The rotation axis as 12...
...Arm, 13...Katsuta, 14...Blade tip, 15
...Cut locus circle, 16...Brush, C...Cut line by the device of the present invention, D...Cut line by traverse cut method, L, L1...Loss length due to cutting.

Claims (1)

[Scope of Claims] 1. In order to cut the sheet-like object while it is traveling, the cutting tool is installed across the entire width of the sheet-like object in the transverse direction of the sheet-like object, and around the rotation center line extending in the transverse direction of the sheet-like object. The blade is rotatably supported in the same direction as the traveling direction of the sheet material so that the trajectory of the blade edge formed in the shape of a saw blade penetrates and traverses the traveling trajectory of the sheet material before cutting. a cutter extending spirally around the rotation center line and in the transverse direction of the sheet-like object with a formed cutting edge facing in the rotation direction; and an elastic body provided on a side surface of the cutter opposite to the rotation center line. A cutting device for a sheet winder, comprising: a brush; and a drive means for rotating the cutter at a speed faster than the traveling speed of the sheet.