JP2003062791A - Slit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slit device which can slit a lengthy web into a prescribed width, and at the same time, prevent a web from being slit in the middle of carrying, and moreover, simplify a constitution. SOLUTION: The slit device is provided with a master roll 51 in which the lengthy web 50 is wound around, a cutter (a cutting machine) 53 which slits the web 50 drawn out from the master roll 51 in the longitudinal direction and forms a plurality of magnetic tapes (a belt-like body) 52, a tensile force adjusting means 54 which adjusts the tensile force of the web 50 passing through a space between the master roll 51 and the cutter 53, and a guide means 55 which presses the web 50 on the outer circumferential face 58 of the master roll 51 over the whole width of the web 50 just before the web 50 is introduced to the cutter 53.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slitting apparatus suitable for manufacturing a magnetic recording medium such as an audio tape, a video tape, an information recording tape and the like. 2. Description of the Related Art As shown in FIG. 5, a magnetic recording medium such as an audio tape, a video tape or an information recording tape has a nonmagnetic flexible support provided with a magnetic layer containing ferromagnetic fine particles. The web 10 as a body is continuously conveyed, and the web 10 is cut into a plurality of narrow magnetic tapes (bands) 12, 12,...
2, 12... Are wound on separate reels 13 and 13. Here, as shown in FIG. 6, for example, when the web 10 is wound, the upper and lower webs 10, 1
When the magnetic layer 14 at the center of the web 10 is applied thicker than both ends in order to make it easier for air to escape from between 0, as shown in FIGS. 7 (a) and 7 (b), When the radius R of the web roll 15 around which the web 10 is wound is large, the difference between the outer diameters at the ends and the center is larger than when the radius R is small, and the central web is elongated and longer than the ends. It will be. Thus, when the web 10 is transported in the stretched state, a tension difference is generated between the end portion and the center portion of the web 10, and the width of the magnetic tape 12 cut from the center portion of the web 10. There is a possibility that the width of the magnetic tape 12 cut from both ends of the web 10 is not uniform. there,
Conventionally, as shown in FIGS. 8 and 9, the roller surface 15a is curved with a constant radius of curvature R1 in the width direction, or the roller surface 16a as shown in FIG.
Attempts have been made to eliminate slack and wrinkles in the width direction of the web 10 by using an expander roller 16 capable of adjusting the curvature radius R2. [0004] However, the crown roller 15 has a radius of curvature R1 of the roller surface 15a.
Is constant, as shown in FIG.
If the cross-sectional shape in the width direction of 0 is different from the shape of the roller surface 15a, when the web 10 is pressed against the crown roller 15, as shown in FIG. There was a problem that occurred. Similarly, for the expander roller 16, the radius of curvature R2 of the roller surface 16a can be adjusted. However, when the cross-sectional shape in the width direction of the web 10 is different from the shape of the roller surface 16a, a partial wrinkle 10a is formed on the web 10. Will occur. Even when the crown roller 15 and the expander roller 16 are used, the web 1 is strongly pressed by pressing the web 10 against these rollers 15 and 16.
Although the slack and wrinkle of 0 can be eliminated, in this case, there arises a problem that the web 10 is cut or a portion in contact with the web 10 is worn. In order to solve such problems, Japanese Patent Laid-Open No. Hei 6
No.-320492 proposes a web dividing method. As shown in FIG. 13, the web dividing method is such that the web 1 enters the approach path of the web 10 to the cutter 18.
Extending frame 19 that crosses 0 in the width direction and circumscribes one side
The groove 20 provided in the extending frame 19 is evacuated to draw the web 10 into the groove 20. According to the method for dividing the web, if the web 10 has slack, wrinkles, etc., the web 10 in the portion supplied to the cutter 18 is flattened by being excessively drawn into the groove 20. Accordingly, the web 10 can be cut with a predetermined width, and magnetic tapes 12, 12,. However, the above-mentioned conventional Japanese Patent Laid-Open No.
In the web dividing method of 320492 publication, the web 10
However, when the web 10 is cut, it is difficult to immediately return the web 10 to the feeding path, and handling is difficult. There was a problem that it was difficult. The present invention has been made in view of the above-described conventional problems, and can cut a long web with a predetermined width, prevent the web from being cut during conveyance, and simplify the configuration. It aims at providing the slit device which can do. In order to achieve the above object, a slitting device according to the present invention comprises a web roll wound with a long web, and the web drawn from the web roll. Cutting means for cutting a sheet in the longitudinal direction to form a plurality of strips, tension adjusting means for adjusting the tension of the web passing between the raw roll and the cutting means, and the web cutting means And guide means for pressing against the outer peripheral surface of the web roll over the entire width of the web immediately before being introduced into the web. According to the slit device of the present invention, immediately before the web drawn from the web roll is supplied to the cutting means, the web is placed on the outer circumferential surface of the web roll having the same shape as the cross-sectional shape in the width direction of the web. Because it presses across the entire width,
The web comes into contact with the original roll without gaps, and deformation in the width direction of the web is suppressed. Therefore, it is possible to prevent the web from being slackened or wrinkled, and thus the web can be accurately cut with a predetermined width. Further, since it is only necessary to lightly press the web against the web roll, the web tension can be reduced, and since there is no sharp part on the web conveyance path, there is no risk of the web being cut, and the web Since it is only pressed against the raw fabric roll, a special member is not required, so that the configuration can be simplified. Further, the web is continuously drawn out from a raw roll wound with a long web, and the drawn web is supplied to a cutting means via a tension adjusting means, and the web is removed by the cutting means. In the method for manufacturing a strip-shaped body that is cut into a plurality of strip-shaped bodies, the object is also achieved by a method for manufacturing a strip-shaped body that is pressed against the outer peripheral surface of the original fabric roll over the entire width immediately before the web is introduced into the cutting means. it can. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a slit device according to the present invention will be described below in detail with reference to the drawings. 1 is a side view showing a slit device according to the present invention, FIG. 2 is a perspective view showing a part of the slit device according to the present invention, and FIG. 3 is a diagram showing a positional relationship between guide means and cutting means according to the present invention. FIG. 4 is a sectional view showing a state in which the web according to the present invention is pressed against the outer peripheral surface of the original fabric roll. As shown in FIG. 1, a slitting device 100 according to an embodiment of the present invention includes a raw roll 51 wound with a long web 50 and a web 50 drawn from the raw roll 51. A cutter 53 that is a cutting means that forms a plurality of strips of magnetic tape 52, 52... And a tension that adjusts the tension of the web 50 that passes between the original fabric roll 51 and the cutter 53. Adjusting means 54;
Immediately before the web 50 is introduced into the cutter 53, guide means 55 is provided that presses against the outer peripheral surface 58 of the web roll 51 over the entire width of the web 50. The tension adjusting means 5
4 is configured by appropriately combining guide rollers 61, 62, and 63. Next, each component described above will be described. The web 50 is formed by coating a magnetic layer on the upper surface of the base film and forming a backcoat layer on the lower surface of the film as necessary. The magnetic layer is coated with a thicker central portion than both ends so that air can easily escape from between the upper and lower webs 50, 50 when the web 50 is wound (see FIG. 6). The magnetic tapes 52, 52..., Which are strips cut from the web 50 with a certain width, are conveyed up and down every other piece and wound around a reel (not shown). As shown in FIG. 2, the cutter 53 has a pair of upper and lower disk-shaped cutter blades 56 and 57, and these cutter blades 56 and 5.
By rotating 7, the web 50 is cut into a predetermined width. The tension adjusting means 54 is constituted by appropriately arranging guide rollers 61, 62, 63 longer than the width of the web 50. For example, the direction F intersecting the guide roller 61 with respect to the conveying direction of the web 50. The web 50 is supported so as to be movable, and a constant urging force is applied to the web 50. According to this configuration, even if the tension in the longitudinal direction of the web 50 changes, the guide roller 61 is controlled to move in the F direction, so that a constant tension is maintained. As a tension adjustment mechanism,
In addition to this, a known adjustment mechanism can be used. The guide means 55 presses the web 50 against the outer peripheral surface 58 of the original fabric roll 51 over the entire width as described above, and is constituted by a roller here. As shown in FIG. 3, the guide means 55 is disposed on the opposite side of the cutter 53 with the original roll 51 interposed therebetween, and the guide means 55
And web passing surfaces 55a of the cutter 53,
A tangent line 59 connecting 53a is the minimum diameter R3 of the raw roll 51.
From the outer peripheral surface 58a, the center 63 of the raw roll 55
It is set to pass through the part close to. This
The web 50 can be pressed against the outer peripheral surface 58 by the guide means 55 continuously from the winding start part to the winding end part of the raw roll. The guide means 55 may be in any form such as a guide plate as long as the web 50 can be pressed against the outer peripheral surface 58 of the original fabric roll 51. Next, the operation of the slit device 100 will be described. As shown in FIG. 1, the web 50 drawn out from the original fabric roll 51 passes through the tension adjusting means 54, the guide rollers 61 and 62, and the guide means 55 and is supplied to the cutter 53, where it is cut into a predetermined width. Magnetic tape 52,
52 ... are manufactured. At this time, the web 50 passing between the guide means 55 and the cutter 53 is uniformly pressed against the outer peripheral surface 58 of the original fabric roll 51 over its entire width, as shown in FIG. The web 50 is a roll 51
Since the cross-sectional shape in the width direction of the web 50 is substantially the same as the cross-sectional shape in the width direction of the outer peripheral surface 58 of the web roll 51, the web 50 is stretched over its entire width. It is pressed against the outer peripheral surface 58 of 51 without a substantial gap. Thereby, the tension | tensile_strength of the elongate direction of the web 50 becomes constant over the full width before and after the part which is contacting with the original fabric roll 50. FIG. The cross-sectional shape of the web 50 in the width direction is
Even when some of the radii of curvature are smaller than the other parts and have a substantially “h” shape, the outer peripheral surface 58 of the raw roll 51
Since the cross-sectional shape in the width direction is substantially the same shape as the web 50, the web 50 can be pressed against the outer peripheral surface 58 of the original fabric roll 51 without any substantial gap.
The tension acting on the web 50 immediately before introduction into the cutter 53 can be made constant over the entire width. Therefore, even if the web 50 is cut to a predetermined width by the cutter 53, the magnetic tapes 52, 52,... Having an accurate uniform width can be obtained, and a high-quality magnetic tape can be manufactured. Even when the web 50 is pulled out from the web roll 51 and the diameter of the web roll 51 is changed, the cross-sectional shape of the web 50 in the width direction and the web roll 51 are changed.
Since the cross-sectional shape in the width direction of the outer peripheral surface 58 is always substantially the same, the web 50 can be pressed against the outer peripheral surface 58 of the original fabric roll 51 without any gap as described above. Thereby, it is possible to reliably prevent the web 50 from being slackened or wrinkled, and to accurately cut the web 50 with a predetermined width. Further, since the force for pressing the web 50 against the original roll 51 can be made relatively small, the tension of the web 50 can be reduced, and there is no acute angle portion on the conveyance path of the web 50, so that the web 50 There is no risk of being disconnected. Moreover, since the web 50 is simply configured to press against the outer peripheral surface 58 of the raw fabric roll 51, the configuration can be simplified without requiring a special member. As described above, according to the slitting apparatus of the present invention, immediately before the web drawn from the raw roll is supplied to the cutting means, the cross-sectional shape in the width direction of the web is almost the same. Since the web is pressed across the entire width of the outer peripheral surface of the shaped original fabric roll, deformation in the width direction of the web can be prevented, and the entire width can be supplied to the cutting means without sagging or wrinkles. As a result, the web is cut into a predetermined width,
A strip having a uniform width can be produced. In addition, the tension of the web can be reduced and the web is not cut because there is no sharp part on the web conveyance path. Further, since the web is only pressed against the original roll, no special member is required, The configuration can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a slit device according to the present invention. FIG. 2 is a perspective view showing a part of the slit device according to the present invention. FIG. 3 is a diagram showing a positional relationship between guide means and cutting means according to the present invention. FIG. 4 is a cross-sectional view showing a state in which the web according to the present invention is pressed against the outer peripheral surface of the original fabric roll. FIG. 5 is a view showing a slit device according to a conventional example. FIG. 6 is a view showing a coating state of a magnetic layer in a general magnetic tape. FIGS. 7A and 7B are diagrams showing a raw roll on which a general web is wound, in which FIG. 7A shows a case where the winding diameter is large, and FIG. 7B shows a case where the winding diameter is small. FIG. 8 is a perspective view showing a crown roller according to a conventional example. 9A and 9B show a crown roller according to a conventional example, in which FIG. 9A shows a state where the curved shape of the web and the curved shape of the crown roller are different, and FIG. 9B shows a state where the web is pressed against the roller surface. FIG. FIG. 10 is an expander roller according to a conventional example;
(A) is a figure which shows the state from which the curved shape of a web differs from the curved shape of an expander roller, (b) is a figure which shows the state which pressed the web against the roller surface. FIG. 11 is a diagram for explaining a web cutting method according to a conventional example. [Explanation of Symbols] 50 Web 51 Raw roll 52 Magnetic tape (band-like body) 53 Cutter (cutting means) 54 Tension adjusting means 55 Guide means 100 Slit device

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Claims (1)

What is claimed is: 1. An original fabric roll wound with a long web, and a cutting means for forming a plurality of strips by cutting the web drawn from the original roll in the longitudinal direction. Tension adjusting means for adjusting the tension of the web passing between the original fabric roll and the cutting means; and the outer circumference of the original roll over the entire width of the web immediately before introducing the web into the cutting means A slitting device comprising guide means for pressing against a surface.