JP4066904B2 - Web cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a web cutting apparatus, and more particularly, to a web cutting apparatus that can be suitably used for manufacturing a magnetic tape for data backup of a computer such as a cassette tape and a video tape.
[0002]
[Prior art]
Various tapes, such as cassette tapes and video tapes, that are also used for computer data backup, have a wide band of web wound in a roll shape, and are pulled out from the delivery side and conveyed by a slitter. (For example, about 800) of the tape is cut into a narrow tape and wound on a winding core. Also, a thin metal sheet or the like is often cut into a plurality of narrow tapes by such a slitter.
[0003]
Conventionally, a slitter used in the manufacture of such a web is a device that cuts a wide, strip-shaped web into a plurality of webs by a pair of upper and lower rotary blades, and a plurality of rotations formed in a roller shape as receiving blades. The blade is generally composed of a blade and a plurality of thin disk-shaped rotating blades that cut the web by applying a shearing force to the web.
[0004]
The web used for the production of such various tapes is a medium-high roll in which the thickness of the roll center is thicker than the thickness of both ends of the roll in order to improve the winding shape in the winding process for producing this web. Generally, it is wound into a shape. That is, in the web before being cut into a plurality of tapes, the outer diameter of the roll center is larger than the outer diameter of both ends of the roll.
[0005]
If this web is suddenly cut into a plurality of tapes by a slitter, the length of the tape collected from the roll center and the tape collected from both ends of the roll will be different. Pulling will occur. As a result, product quality defects such as variations in the product tape width occur. This variation in tape width also occurs in the longitudinal direction of one web, and also occurs between a plurality of tapes cut from the same longitudinal position of the web (for example, between about 800).
[0006]
Also, there may be a problem of poor tape running due to tape slack. Similarly, a cleaning means equipped with a polishing head is often provided in the tape transport path. However, when there is variation in the tension of the tape, wear of the polishing head that comes into contact with the tape with low tension is promoted. It has been pointed out that it is easy to cause problems.
[0007]
Furthermore, when the web having the above shape is cut into a plurality of tapes by a slitter, it is inevitable that the tape is curved depending on the portion of the web to be collected.
[0008]
Various proposals have been made to deal with these problems (see Patent Documents 1 to 3). Among these, the proposal of patent document 1 employ | adopts the structure which applies a vacuum pressure immediately before cutting | judgement of a web, and forcibly expands a web. The proposal described in Patent Document 2 employs a configuration in which a plurality of tensioners are provided before the web is cut and tension is applied to the stretched portion of the web. The proposal described in Patent Document 3 employs a configuration in which the shape of a roll is measured and a shape absorber corresponding to this shape is provided. And these proposals are said to be able to reduce the occurrence of the above problems by various means.
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-320492
[Patent Document 2]
Japanese Patent Laid-Open No. 9-7170
[Patent Document 3]
JP 2000-322735 A
[Problems to be solved by the invention]
However, even if various conventionally known means are adopted, it is difficult to make the tension of each tape completely uniform, and the variation in the tape width due to the nonuniform tape tension has not been solved. Similarly, the concern about the occurrence of problems due to web slack has not been resolved.
[0013]
Conventionally, efforts have been made to equalize the tension of individual tapes by providing a magnetic clutch or the like, but it is not enough to control the rotation speed of individual guide rollers, and the effect is insufficient. there were.
[0014]
Therefore, the above conventional technique has a problem in answering the required accuracy of the tape width that has been required in recent years. That is, a backup tape typified by computer use, particularly a backup tape having a servo track, has a required accuracy of a high tape width, and a technology step-up has been required to satisfy quality and yield.
[0015]
The present invention has been made in view of such circumstances, and in the production of a tape that is cut from a web into a plurality of narrow tapes and wound around a winding core, the tension of a wide belt-like web is obtained. An object of the present invention is to provide a web cutting device that can improve the productivity and product quality by making the tape width uniform.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a web supply means for pulling out a wide belt-like web wound in a roll shape from the feed side, a slitter for cutting the web into a plurality of narrow tapes, The slitter is provided between a tape winding means for winding the plurality of tapes individually wound around a winding core, the web supply means, and the slitter, and the web is supported by a roller member. And a web cutting means for guiding the web to the web conveying means, wherein the web conveying means has a plurality of roller members, which are cylindrical members having a predetermined width, mounted on the rotation shaft, and the rotation shaft and the roller. A friction low having torque generating means for generating a predetermined torque between the rotating shaft and the roller member in accordance with a difference in rotational speed with the member. The equipped, to provide a web cutting device, characterized in that the width direction of the tension distribution of the web by the friction roller has become uniform possible.
[0017]
According to the present invention, the web conveying means provided between the web supply means and the slitter is provided with a friction roller, and rotates according to the difference in rotational speed between the rotation shaft of the friction roller and each roller member. A predetermined torque is generated between the shaft and the individual roller members. Thereby, the tension distribution in the width direction of the web can be made uniform. As a result, the tape width can be made uniform, and the productivity and product quality can be improved.
[0018]
In the present invention, the torque generating means is preferably a magnetic clutch. If such a magnetic clutch is employed, a torque approximately proportional to the difference in rotational speed between the rotating shaft and the roller member can be generated between the rotating shaft and the roller member, and the effect of the present invention is further enhanced. It is. Here, as the magnetic clutch, for example, a conductive plate is provided on one side of the rotating shaft and the roller member, a magnet is provided on the other side, and a combination of the conductive plate and the magnet generates a predetermined torque. Type clutch can be used.
[0019]
As the torque generating means for generating a predetermined torque between the rotating shaft and each roller member, well-known means such as a mechanical friction bearing friction clutch and hysteresis clutch are adopted in addition to the magnetic clutch described above. it can.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a web cutting device according to the present invention will be described in detail with reference to the accompanying drawings.
[0021]
FIG. 1 is a configuration diagram of a web cutting device 10 used in the present invention, and FIG. 2 is a schematic diagram showing an example of a slitter 14. The web cutting apparatus 10 of the present invention is mainly composed of a web supply means 13, a web conveyance means 25, a slitter (cutting apparatus) 14, a tape winding means 50, and a tape conveyance means 60.
[0022]
As shown in FIG. 1, in the web supply unit 13, a web 20 wound in a roll shape is mounted on the hub 12 (core) of the rewind reel 11. The web 20 is usually manufactured by forming a magnetic layer containing ferromagnetic fine particles on a nonmagnetic support by a coating method, a vacuum deposition method, or the like, and performing orientation treatment, drying treatment, surface treatment, etc. on the magnetic layer. The
[0023]
A web transport unit 25 is provided between the rewind reel 11 and the slitter 14, and the web transport unit 25 includes a plurality of guide rollers 21, 21,. A friction roller 24 that regulates the conveyance speed is provided. The friction roller 24 is connected to a motor (not shown) whose rotation speed can be freely changed, and the web 20 is wound around the outer peripheral surface of the friction roller 24 and rotated to arbitrarily change the conveyance speed of the web 20. To do.
[0024]
The rotational speed of the hub 18 (core) of the take-up reel 17 in the tape take-up means 50 is controlled with reference to the average peripheral speed of the outer periphery of the friction roller 24. The means for regulating the conveyance speed of the web 20 is not limited to the friction roller 24, and other means can be used.
[0025]
One of the other means is a grooved suction drum. The grooved suction drum is connected to a motor (not shown) whose rotation speed can be freely changed, and rotates by adsorbing the web 20 to the outer peripheral surface of a drum having a plurality of grooves in the circumferential direction. This is a device that arbitrarily changes the conveyance speed of the web 20. In addition, as a means for regulating the conveyance speed of the web 20, a pinch roller that pinches and conveys the web 20 can also be used.
[0026]
The slitter 14 is a device that cuts the wide web 20 into a plurality of tapes 26, 26,... By a pair of upper and lower rotary blades 30, 32. As shown in FIG. The plurality of rotating lower blades 30, 30... And the thin disk-shaped rotating upper blades 32, 32. .
[0027]
The rotating lower blade 30 is fitted and fixed to the lower shaft 34 via a spacer 36, and the rotating upper blade 32 is fitted and fixed to an upper shaft 38 parallel to the lower shaft 34 via a spacer 40, The blade tip portions of the blade 32 and the rotating lower blade 30 are arranged so as to overlap each other. The rotating upper blade 32 is urged to the right in the axial direction of FIG. 2 by a spring (not shown), and is positioned in a state in which the cutting edge portion of the rotating upper blade 32 is in contact with the cutting edge portion of the rotating lower blade 30. The upper shaft 38 and the lower shaft 34 are respectively connected to motors 41 and 43 whose rotation speeds can be freely changed, and the peripheral speeds of the rotary upper blade 32 and the rotary lower blade 30 can be individually changed.
[0028]
As described above, in the web conveyance unit 25 provided between the web supply unit 13 and the slitter 14, the friction roller 24 that equalizes the tension distribution in the width direction of the web 20 is provided. The friction roller 24 is configured by mounting a plurality of roller members 22, which are cylindrical members having a predetermined width, on a rotation shaft 23. In the example of FIG. 1, only one roller member 22 is shown, but the number and arrangement of the roller members 22 can be arbitrarily selected according to the width of the web 20 and the like.
[0029]
FIG. 3 is a schematic diagram showing the configuration of the friction roller 24 and the eddy current clutch 80 (magnetic clutch) provided on the friction roller 24. That is, FIG. 4A is a perspective view of the entire friction roller 24 showing a state in which a plurality of roller members 22, 22... Are mounted on the rotary shaft 23, and FIG. 3 is a partial cross-sectional view showing a configuration of a roller member 22. FIG. The upper half is shown in section in FIG.
[0030]
3B, the roller member 22 includes a boss 62 constituting an outer peripheral portion, a bearing 64 fitted to the inner periphery of the boss 62, a stopper ring 76 for preventing the bearing 64 from falling off, and an eddy current type. And a clutch 80.
[0031]
The boss 62 includes two members, a boss main body 62A that is a member disposed on the inner peripheral side and a crown ring 62B that is a member disposed on the outer peripheral side of the boss main body 62A. With this configuration, the boss body 62A that requires dimensional accuracy is made of, for example, a metal material, and the crown ring 62B that requires control of hardness, crown shape, and the like is made of, for example, a rubber material, a resin material, or the like. Constructable and convenient. However, the boss body 62A and the crown ring 62B may be made of an integral material.
[0032]
Grooves 90, 90, 90 for preventing the web 20 from slipping are formed on the outer peripheral surface of the boss 62. Further, the inner peripheral diameters of the bearings 64 and 64 are sized so that the rotary shaft 23 can be inserted.
[0033]
FIG. 4 is a diagram showing a configuration of the eddy current clutch 80 used in the magnetic clutch, (a) is a partially enlarged view of FIG. 3 (b), and (b) is a different configuration. It is the elements on larger scale which show an example. In either case, the configuration of the roller member 22 corresponding to the width of one tape 26 is shown. In addition, the roller member 22 corresponding to the width | variety for the some tape 26 may be sufficient.
[0034]
In FIG. 4A, a magnet holding ring 66 is fitted on a rotating shaft 23 (not shown) (see FIG. 3A). Similarly, an inner ring 64 </ b> A of a bearing 64 is fitted on the rotary shaft 23. Therefore, the magnet holding rings 66 of all the roller members 22 and the inner ring 64 </ b> A of the bearing 64 rotate integrally with the rotary shaft 23. The width of the magnet holding ring 66 is formed so as to protrude to the side from the end face of the boss 62 (62A) so as to fulfill the function of a spacer ring that regulates the distance between the adjacent roller members 22. ing.
[0035]
A flange 70 is formed on the outer periphery in the vicinity of the right end portion of the magnet holding ring 66, and recessed portions are formed at equal intervals on the same circumference on the left side of the flange 70, and a magnet 68 is formed in the recessed portion. It is mated. The flange 70 is preferably made of iron in order to prevent leakage of magnetic flux.
[0036]
On the other hand, on the right side of the inner peripheral portion of the boss main body 62A, a ring-shaped conductor plate 72 having substantially the same dimensions as the flange 70 is disposed so as to face the magnet 68 with a predetermined interval. The conductor plate 72 is fixed to the right side of the inner peripheral portion of the boss main body 62A via an iron ring 74 for preventing magnetic flux leakage. The size and shape of the iron ring 74 are substantially the same as those of the conductor plate 72. The conductor plate 72 is made of copper or aluminum.
[0037]
The outer ring 64B of the bearing 64 is fitted to the inner peripheral portion of the boss main body 62A, and the conductor plate 72 and the iron ring 74 are fixed to the boss main body 62A as described above. Therefore, the boss main body 62 </ b> A, the conductor plate 72, and the iron ring 74 of each roller member 22 rotate integrally with the outer ring 64 </ b> B of the bearing 64. Moreover, these are rotatable independently of the rotating shaft 23.
[0038]
With the configuration as described above, the eddy current clutch 80 is formed between each boss body 62A and the like and the rotary shaft 23. When the rotating shaft 23 of the roller member 22 is driven so as to convey the web 20, each eddy current type clutch 80 transmits the rotation to each boss body 62 </ b> A. In the eddy current clutch 80, an eddy current is generated in the conductor plate 72 in accordance with the relative movement between the magnet 68 rotating together with the rotating shaft 23 and the conductor plate 72 fixed to the boss main body 62A and opposed thereto. Each boss body 62 </ b> A is driven to rotate with a constant torque following the rotation of the rotating shaft 23 by the attractive force of the primary magnetic flux generated by the magnet 68 and the secondary magnetic flux generated by the eddy current generated in the conductor plate 72.
[0039]
In this way, the tension distribution in the width direction applied to the web 20 can be controlled by the individual eddy current clutch 80, and as a result, the tension of the plurality of tapes 26 after cutting can be made uniform. . The roller member 22 is provided with the eddy current clutch 80, thereby forming a magnetic clutch as a torque generating means. In addition, the structure of a magnetic clutch is not limited to the above structure, The example of the following structure is also employable.
[0040]
FIG. 4B shows an eddy current clutch 80 based on the same principle, but the configuration is slightly different. In the figure, the magnet 68, the flange 70, the conductor plate 72, and the iron ring 74 are all formed in a wide and thin ring shape, the magnet 68 is disposed on the inner peripheral side, and the conductor plate 72 is disposed on the outer peripheral side. The magnet 68 and the conductor plate 72 are configured to face each other. However, each function is substantially the same as that of the structure shown by the figure (a).
[0041]
In each of the above two examples, the magnet 68 is fixed to the rotating shaft 23 side, and the conductor plate 72 and the iron ring 74 are fixed to the boss main body 62A side.
[0042]
In addition, for example, an eddy current type clutch disclosed in Japanese Patent Application Laid-Open No. 2000-185850 by the present applicant may be employed. The magnet 68 employed in each of the eddy current clutches 80 is a permanent magnet, but an electromagnet can be used instead. Furthermore, it does not prevent the application of similar means other than the eddy current clutch. When an electromagnet is used for the magnet 68, various known means such as a slip ring can be used as a means for supplying power to the electromagnet.
[0043]
The size of the roller member 22 of the friction roller 24 is not particularly limited. In the case of the web 20 for a magnetic recording medium, the roller member 22 has a width of 5 to 50 mm, preferably 20 to 40 mm. The outer diameter of 22 can be 80 to 120 mm.
[0044]
Next, the operation of the web cutting apparatus 10 configured as described above will be described. First, the roll-shaped web 20 wound around the rewind reel 11 of the web supply means 13 is continuously drawn out from the rewind reel 11 and conveyed to the slitter 14 via the web conveying means 25. Then, it is cut into a plurality of tapes 26 by the slitter 14, transported by the roller members 22, 22... Of the tape transport means 60, and taken up by the hub 18 of the take-up reel 17 of the tape take-up means 50. Thereby, for example, the web 20 is cut into 100 to 1000 pieces, and the tape 26 having a specified width dimension (for example, 12.65 mm, 25.4 mm, 3.81 mm, etc.) is manufactured.
[0045]
In this series of steps, the web conveying means 25 is provided with a friction roller 24 having a magnetic clutch which is a torque generating means, and the tension distribution in the width direction of the web 20 being conveyed can be controlled.
[0046]
More specifically, the rotational speed of the rotating shaft 23 is set to be larger than the rotational speed necessary for transporting the web 20 when it is assumed that there is no difference in rotational speed between the rotating shaft 23 and the roller member 22. If it does so, the roller member 22 will rotate with the rotation speed smaller than the rotating shaft 23 in any location of the width direction of the web 20. FIG. Even in the width direction of the web 20, the center portion with more sagging rotates at a relatively high peripheral speed, and the end portion without sagging rotates at a relatively slow peripheral speed.
[0047]
In this case, as a characteristic of the eddy current clutch 80, a torque approximately proportional to the difference in rotational speed between the rotating shaft 23 and the roller member 22 is generated between the rotating shaft 23 and the roller member 22, so that the width direction of the web 20 The tension applied to the central portion of the web 20 is relatively small, and the tension applied to the end of the web 20 in the width direction is relatively large. As a result, the tension distribution in the width direction of the web 20 can be made uniform. Thereby, the width | variety of the tape 26 after a cutting | disconnection can be equalized, and malfunctions, such as a curvature resulting from the slack of the tape 26, etc. do not arise.
[0048]
As mentioned above, although the example of embodiment of the web cutting device which concerns on this invention was demonstrated, this invention is not limited to the example of the said embodiment, Various aspects can be taken.
[0049]
For example, in the present embodiment, the eddy current clutch 80, which is a kind of magnetic clutch, is employed as the torque generating means, but a bearing friction clutch having a mechanical configuration other than this can also be employed. As a specific configuration, an air tube is provided between the rotating shaft and the roller member, and air of a predetermined pressure is supplied to the air tube to generate friction between the rotating shaft and the roller member. .
[0050]
In the present embodiment, the roller member 22 of the friction roller 24 has a simple cylindrical shape. However, the outer peripheral surface of the roller member 22 can be formed to have a medium height. With the roller member 22 having such a shape, problems such as the web 20 moving in the width direction from the roller member 22 can be prevented.
[0051]
Further, in the present embodiment, the material of the roller member 22 of the friction roller 24 is not referred to, but for example, the outer peripheral surface of the roller member 22 is made of a material having a hardness defined by JIS K6301A in the range of 30 to 95. It can also be formed. In this way, in addition to preventing problems such as the web 20 moving in the width direction from the roller member 22, it is also possible to prevent the occurrence of scratches.
[0052]
Furthermore, as a preferred embodiment, a configuration similar to that of the friction roller 24 of the present embodiment can be provided downstream of the slitter 14 to control the tension of each individual tape 26 after cutting.
[0053]
【Example】
Using the web cutting device 10 configured as described above, the tape 26 was manufactured, and the tape width was evaluated. At the same time, a comparative example using a conventional web cutting apparatus was also evaluated. Each of the manufactured tapes 26 has a tape width of 12.650 mm (1/2 inch) as a design value. As manufacturing conditions, the tape conveyance speed (measured with the slitter 14) was 400 m / min.
[0054]
In the evaluation, three portions of the web traveled 10,000 m were measured by the optical width measuring means, and the maximum value, the minimum value, the average value, and the standard deviation were obtained.
[0055]
In the embodiment of the present invention, the maximum value is 12.654 mm, the minimum value is 12.647 mm, the average value is 12.651 mm, and the standard deviation is 0.9 μm, which is 12.650 ± It entered the range of 0.005 mm.
[0056]
On the other hand, in the comparative example, the maximum value is 12.657 mm, the minimum value is 12.644 mm, the average value is 12.650 mm, and the standard deviation is 2.2 μm, which is 12.650 ± 0, which is a product standard for high-precision products. It was out of the range of 0.005 mm.
[0057]
【The invention's effect】
As described above, according to the present invention, the web conveying means provided between the web supply means and the slitter includes the friction roller, and the rotational speed between the rotation shaft of the friction roller and each roller member is determined. In accordance with the difference, a predetermined torque is generated between the rotating shaft and the individual roller members. Thereby, the tension distribution in the width direction of the web can be made uniform. As a result, the tape width can be made uniform, and the productivity and product quality can be improved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a web cutting device used in the present invention. FIG. 2 is a side view of a slitter. FIG. 3 is a configuration diagram showing an outline of a magnetic clutch. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Web cutting device, 11 ... Rewinding reel, 13 ... Web supply means, 14 ... Slitter (cutting device), 17 ... Winding reel, 18 ... Hub (core), 20 ... Web, 22 ... Roller member, DESCRIPTION OF SYMBOLS 23 ... Rotating shaft, 24 ... Friction roller, 25 ... Web conveying means, 26 ... Tape, 50 ... Tape winding means, 60 ... Tape conveying means, 80 ... Eddy current clutch

Claims (2)

A web supply means for pulling out a wide belt-shaped web wound in a roll shape from the delivery side;
A slitter for cutting the web into a plurality of narrow tapes;
A tape winding means for individually winding the cut tapes around a winding core;
In the web cutting device, which is provided between the web supply means and the slitter, and has web conveying means for guiding the web to the slitter while supporting the web by a roller member,
The web conveying means includes a plurality of roller members, which are cylindrical members having a predetermined width, mounted on a rotation shaft, and the rotation shaft and the roller member according to a difference in rotation speed between the rotation shaft and the roller member. A web cutting machine comprising a friction roller having a torque generating means for generating a predetermined torque between the roller member and a tension distribution in the width direction of the web can be made uniform by the friction roller. apparatus. The web cutting device according to claim 1, wherein the torque generating means is a magnetic clutch.

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