JP2004017210A - Wide sheet tension stabilizing device, wide sheet tension stabilizing method, magnetic tape cutting machine, and magnetic tape cutting method - Google Patents

Abstract

An object of the present invention is to provide a magnetic tape cutting machine capable of obtaining a uniform magnetic tape without shape distortion.
A wide sheet tension stabilizing device (40) is interposed in a traveling path of a wide sheet (12) made of a magnetic tape sent from an unwinding roll until the sheet is cut by a slitter knife. The sheet 12 is wound around a large-diameter roll E provided in a housing 41 of the device 40 and passed through a gap between small-diameter rolls D and F on both sides. The wide sheet 12 on the roll E is pulled up by sucking the inside of the housing 41 by a vacuum blower through the exhaust ports 28a to 28c, the pipes 29a to 29c, and the exhaust path 50 penetrating the upper plate 41u of the housing 41, and The vehicle is run with the tension caused by sheet feeding balanced. Thereby, the tension in the width direction of the sheet 12 is made uniform, and the shape distortion on the sheet 12 is improved.
[Selection] Fig. 6

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for stabilizing the tension of a wide sheet for improving the distortion shape of a wide sheet such as a magnetic tape, and a cutting machine and a cutting method for the magnetic tape.
[0002]
[Prior art]
In the cutting step of the magnetic tape manufacturing process, a wide sheet tape (hereinafter, referred to as a wide sheet) that has been subjected to the surface treatment and the curing treatment is cut into a predetermined width and length. As this cutting method, a method of cutting by a shear force by passing a wide sheet between a pair of cutters composed of an upper blade and a lower blade is widely used.
[0003]
In a magnetic tape cutting machine, a wide sheet is fed from a delivery roll to a cutter via a pinch roll, cut, and then wound on a take-up roll.
[0004]
Normally, when cutting a wide sheet, tension is uniformly applied to all tapes after cutting, that is, to all channels.
[0005]
In this case, as shown in FIG. 11A, if the unwinding roll is a roll (cylindrical roll) 1a wound with a uniform tension, the wide sheet 2a sent out from the unwinding roll 1a will When cutting is performed with a pair of cutters, as shown in FIG. 11A, the cutting width b is substantially constant as shown in FIG. 11C, and a uniform magnetic tape with small meandering can be obtained. .
[0006]
On the other hand, if the shape of the base film is bad or the coating thickness is partially increased in the width direction in the coating process, the difference in thickness is accumulated, and the roll is partially raised in the axial direction. May be possible. Such rolls are not wound with uniform tension.
[0007]
[Problems to be solved by the invention]
When cutting a sheet from a roll with a partially raised shape in the axial direction described above or an unwinding roll in which other wide sheets are not wound with uniform tension, the width of the tape after cutting changes or the tape However, there is a problem that a uniform magnetic tape may not be obtained due to the meandering of the shape or the dirty cross section of the tape.
[0008]
That is, for example, when trying to cut into a fixed width, as shown in FIG. 12A, the wide sheet 2b sent out from the unwinding roll 1b which partially rises in the axial direction and has a wavy shape is used as shown in FIG. When cutting is performed with a set of cutters as in b), the shape of the unwinding roll 1b is directly reflected on the tape width.
[0009]
For this reason, as shown in FIG. 12C, the width of the tape is unacceptably widened by Δb1 and Δb2, and the meandering of the tape is greatly wavy in the plane direction. The maximum amplitude of the waveform may exceed the allowable range.
[0010]
Conventionally, when cutting the tape sent from the unwinding roll having a partially raised shape in the axial direction and having a poor shape, there is a means for improving the shape and cutting in response to the shape regardless of the shape. Did not.
[0011]
In addition to the above-described magnetic tape cutter, for example, when a product is manufactured by processing a wide sheet as a raw material made of a material other than a magnetic tape, the distortion shape (the distortion) formed in the width direction of the wide sheet is considered. Shaped portions are non-uniform) should be reliably removed.
[0012]
The present invention has been made in view of the above points, and an object of the present invention is to provide a wide sheet tension stabilizing apparatus and method capable of obtaining a uniform wide sheet without shape distortion, and to improve the cutting accuracy of a magnetic tape. An object of the present invention is to provide a magnetic tape cutter capable of obtaining a uniform magnetic tape without shape distortion and a method for cutting the same.
[0013]
[Means for Solving the Problems]
The wide sheet tension stabilizing device of the present invention is a wide sheet tension stabilizing device interposed in a traveling path of a wide sheet traveling under a state in which a predetermined tension is applied in a longitudinal direction, wherein the wide sheet Area setting means which is in contact with one surface and sets an area for equalizing the tension in the width direction, and from the other surface side of the wide sheet which faces the area setting means, in the longitudinal direction. A drawing means for drawing in the wide sheet with a drawing force smaller than the tension.
[0014]
Further, the drawing-in means includes a housing surrounding a space from the area setting means to a portion separated from the area setting means by a predetermined distance on a side facing the area setting means, and an exhaust connected to the space in the housing and exhausting the space. Means.
[0015]
The area setting means may be in contact with one surface of the wide sheet, and may be a first roll that is driven to rotate in accordance with a traveling speed of the wide sheet. A second roll which is in contact with the other surface of the wide sheet and is driven to rotate in accordance with the traveling speed of the wide sheet.
[0016]
Further, the diameter of the first roll is configured to be larger than the diameter of the second roll.
[0017]
Further, each end of the first roll and the second roll and the housing are sealed with a mechanical seal.
[0018]
Further, it is characterized in that it has means for adjusting a gap between the outer peripheral portion of the second roll and the housing.
[0019]
Further, it is characterized in that it has means for adjusting a gap between the first roll and the second roll.
[0020]
Further, the wide sheet tension stabilizing method of the present invention sets an area for equalizing the tension in the width direction of the running wide sheet, and sets the set area in the longitudinal direction and the width direction of the wide sheet. It is characterized in that it is retracted in a direction perpendicular to the longitudinal direction with a retracting force smaller than the longitudinal tension.
[0021]
Further, the magnetic tape cutting machine of the present invention comprises a winding roll for feeding a wide sheet made of a magnetic tape, cutting means for cutting the fed wide sheet to a predetermined width, and winding the cut sheet by the cutting means. In a magnetic tape cutting machine having a take-up roll, a wide sheet running between the unwinding roll and the cutting means and traveling with a predetermined longitudinal tension is interposed, and one surface of the wide sheet is provided. Area setting means for setting an area for equalizing the tension in the width direction, and from the other surface side of the wide sheet, which is opposite to the area setting means, from the tension in the longitudinal direction. A tension stabilizing device having a retracting means for retracting the wide sheet with a small retracting force.
[0022]
Further, the drawing-in means includes a housing surrounding a space from the area setting means to a portion separated from the area setting means by a predetermined distance on a side facing the area setting means, and an exhaust connected to the space in the housing and exhausting the space. Means.
[0023]
The area setting means may be in contact with one surface of the wide sheet, and may be a first roll that is driven to rotate in accordance with a traveling speed of the wide sheet. A second roll which is in contact with the other surface of the wide sheet and is driven to rotate in accordance with the traveling speed of the wide sheet.
[0024]
Further, the diameter of the first roll is configured to be larger than the diameter of the second roll.
[0025]
Further, each end of the first roll and the second roll and the housing are sealed with a mechanical seal.
[0026]
Further, it is characterized in that it has means for adjusting a gap between the outer peripheral portion of the second roll and the housing.
[0027]
Further, it is characterized in that it has means for adjusting a gap between the first roll and the second roll.
[0028]
In the method of cutting a magnetic tape according to the present invention, a first step of feeding a wide sheet made of a magnetic tape from an unwinding roll, and sending the wide sheet fed from the unwinding roll to a cutting unit by a pinch roll. A second step, a third step of cutting the wide sheet fed from the pinch roll into a predetermined width by the cutting unit, and winding the cut sheet by the cutting unit by a winding roll In the magnetic tape cutting method including the fourth step, at least at the time of performing the second step, an area for equalizing the tension in the width direction of the fed wide sheet is set, and the set area is set. It is characterized in that the wide sheet is drawn in with a drawing force smaller than the tension in the longitudinal direction in a direction perpendicular to the longitudinal direction and the width direction of the wide sheet. It is set to.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an embodiment of the present invention relating to a magnetic tape cutter will be described. FIG. 1 is a conceptual diagram showing the entire configuration of the embodiment.
[0030]
In FIG. 1, reference numeral 11 denotes an unwinding roll in which a wide sheet (magnetic tape after surface treatment and hardening treatment) 12 is wound around a metal cylindrical core. The unwinding roll 11 sends out the wide sheet 12 to the pinch roll, and the wide sheet 12 is sent to the slitter knife 14 via the pinch roll 13 and the tension stabilizing device 20.
[0031]
The slitter knife 14 cuts the wide sheet 12 to a predetermined width by the shearing force of the upper blade and the lower blade as described with reference to FIG. The cut wide sheet 12 (tape) is individually wound by a plurality of winding rolls 15, 15,.
[0032]
Here, an example of the unwinding roll 11 is shown in FIG. FIG. 10A is a cross-sectional view of the unwinding roll 11, which is obtained by winding a wide sheet partially coated with a thick coating in a coating process on a metal cylindrical core. As shown in the figure, the difference in thickness is accumulated, and the roll becomes a shape in which the portion is raised in the axial cross section. It is considered that the portion where the coating thickness is large is generated randomly in the width direction.
[0033]
FIG. 10B is a conceptual diagram showing a cross section of one layer of the wide sheet 12 of the roll 11. In FIG. 10 (b), even if tension is applied to the raised portion, the tension is lower than the other portions, and the portion is wavy. The unwinding roll 11 in the present embodiment employs a roll as shown in FIG. 10 (hereinafter referred to as a corrugated roll).
[0034]
The pinch roll 13 has a function of adjusting the tension of the wide sheet 12 before cutting the wide sheet 12. However, conventionally, in the case of a corrugated roll, as described above, the tension is not uniform in the width direction of the wide sheet 12.
[0035]
In the present embodiment, the wide sheet tension stabilizing device 20 is installed between the pinch roll 13 and the slitter knife 14 as shown in FIG.
[0036]
Here, details of the wide sheet tension stabilizing device 20 will be described with reference to FIGS. FIG. 2A shows a front configuration of the wide sheet tension stabilizing device 20, and FIG. 2B shows a side configuration.
[0037]
In FIG. 2, reference numeral 21 denotes a housing (box) having an open lower surface, and three rolls A, B, and C (for example, each having a diameter of φ60) having the same diameter are juxtaposed on the same plane in the opening. I have. A wide sheet 12 running with a predetermined longitudinal tension is wrapped around the center roll B, and the sheet 12 is passed through gaps between the left and right rolls A and C.
[0038]
In the gap between the roll B and the left and right rolls A and C, a roll gap adjusting block (spacer) 22 for adjusting the gap is provided as shown in FIG. 3, for example.
[0039]
FIG. 3 is an enlarged view of the configuration of each side surface of the roll C and the central roll B disposed on the rear plate 21r side of the housing 21. The gap between the roll B and the rolls A and C has a structure that can be adjusted within a range of 1 mm to 5 mm, and it is necessary to select an optimum gap according to the thickness and shape of the wide sheet 12.
[0040]
For the same reason, a gap adjusting plate 23 for adjusting the gap between the front and rear plates 21f and 21r of the housing 21 and the rolls A and C is provided. This gap has a structure that can be adjusted within a range of 1 mm to 5 mm.
[0041]
The roll gap adjusting block 22 and the gap adjusting plate 23 have an effect of stabilizing an exhaust force when the inside of the housing 21 is depressurized and exhausted by means described later.
[0042]
Both shaft ends of each of the rolls A, B, and C are rotatably attached to the side plate 21s of the housing 21 by a sealing method such as a mechanical seal or a labyrinth seal.
[0043]
That is, in order to make the exhaust ports at both axial ends of the rolls A, B, and C as small as possible, for example, as shown in a mechanical seal of FIG. Is fixed to the side plate 21s.
[0044]
FIG. 4 shows only one shaft end portion of one roll in an enlarged manner, and FIG. 2A shows a front view in which the front plate 21f and the roll A are removed.
[0045]
Since the rolls A, B, and C come into contact with the wide sheet 12, the rolls A, B, and C are configured to be rotationally driven to prevent abrasion.
[0046]
That is, the rotation can be controlled by the servomotor 27 (fixed outside the side plate 21s) via the pulley 25 and the belt 26 attached to the shaft ends of the rolls A, B, and C.
[0047]
A plurality of pipes 29a to 29c are formed integrally with the upper plate 21u of the housing 21 so that the exhaust ports 28a to 28c are connected to the inside of the housing 21.
[0048]
The pipes 29 a to 29 c are connected to an exhaust device 30, and the exhaust device 30 is controlled to exhaust air from the inside of the housing 21 to generate a reduced pressure state in the housing 21.
[0049]
In the device configured as described above, the wide sheet 12 travels under a certain tension, but as described in FIG. 10, the unwinding roll 11 is a corrugated roll, and the wide sheet 12 The portion is wavy, and the tension is not uniformly applied to the portion.
[0050]
In such a state, the inside of the tension stabilizing device is evacuated, the inside of the housing 21 is decompressed, a lifting force is applied, and the vehicle is run in a state where the lifting force and the tension caused by the feeding of the wide sheet 12 are balanced. 5, the wide sheet 12 floats on the roll B.
[0051]
Since the wide sheet portion wound on the roll B floats under the negative pressure in this manner, the roll B functions to specify (set) an area for equalizing the tension in the width direction. Further, the rolls A and C function to press sheets in an area other than the area specified by the roll B.
[0052]
As described above, by floating and traveling, the wide sheet 12 is uniformly tensioned over the entire width. Thereby, the wavy shape of the wide sheet 12 is improved.
[0053]
The sheet flying height at this time is desirably about 1 mm, but varies depending on the shape distortion state of the wide sheet 12. If the pulling force exceeds the tension, the wide sheet 12 comes into close contact with the exhaust ports 28a to 28c and cannot run. Therefore, the relationship between the lifting force (F) and the tension (T) must be in a state of F <T.
[0054]
Further, the width of the wide sheet 12 can correspond to, for example, 12 inches (304.8 mm) or 24 inches (609.6 mm). However, it is needless to say that the length is not limited to these.
[0055]
As described above, according to the present embodiment, the wide sheet tension stabilizing device 20 can uniformly apply tension to the entire width of the tape regardless of the shape of the unwinding roll. The cutting accuracy is improved.
[0056]
In addition, it is possible to suppress the fluctuation of the tape width and the occurrence of meandering caused by the unwinding roll having a defective shape, thereby reducing defective products, improving the yield, and improving the uniform magnetic property. You can get tape.
[0057]
It should be noted that the wide sheet tension stabilizing device 20 is configured not only to pull up the wide sheet 12 in the vertical direction as described above but also to rotate the apparatus by a predetermined angle, for example, 90 °, and to pull the sheet in the horizontal direction. You may.
[0058]
In the present embodiment, the retracting means for retracting the wide sheet according to the present invention is constituted by the housing 21, the exhaust ports 28a to 28c, the pipes 29a to 29c, the exhaust device 30, and the like. Other devices may be used. Further, the number of the exhaust ports and pipes may be set to other numbers.
[0059]
In this embodiment, the area setting means of the present invention is constituted by the roll B (first roll) and the rolls A and C (second roll). It may be constituted by a device. Further, the number of the rolls (A, B, C) is not limited to that shown in FIG.
[0060]
Further, a plurality of wide sheet tension stabilizing devices 20 may be interposed in the traveling path of the wide sheet.
[0061]
Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, the configuration of the roll (area setting means) of the wide sheet tension stabilizer 20 is changed as shown in FIG. 6, and the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.
[0062]
FIG. 6A shows the front configuration of the wide sheet tension stabilizer 40, and FIG. 6B shows the side configuration.
[0063]
In FIG. 6, reference numeral 41 denotes a housing (box) having an open lower surface, and rolls D and F (second rolls) having the same diameter (for example, each having a diameter of 60) on the same plane at a predetermined distance from each other on the same plane. Are arranged. A roll E (first roll) having a diameter larger than the diameter of the rolls D and F (for example, at a position between the rolls D and F and a predetermined distance above a plane connecting the centers of the rolls D and F (for example, φ80) is provided.
[0064]
A wide sheet 12 running with a predetermined longitudinal tension is wound around the roll E, and the sheet 12 is passed through gaps between the rolls D and F. 23 is a gap adjusting plate similar to FIG.
[0065]
The shaft ends on both sides of each of the rolls D, E, F are rotatably attached to the side plate 41s of the housing 41 by the same sealing method as in FIG.
[0066]
FIG. 6A is a front view showing the front plate 41f with the front plate 41f removed. Pulleys, belts, servomotors, and the like for rotating the rolls D to F are configured in the same manner as in FIG. Omitted.
[0067]
The air in the housing 41 is sucked in the same manner as described above, and is discharged to a vacuum blower (not shown) through the exhaust ports 28a to 28c, the pipes 29a to 29c, and the exhaust path 50.
[0068]
FIG. 7 shows the entire configuration of a magnetic tape cutter using the wide sheet tension stabilizing device 40, and the same parts as those in FIG. 1 are denoted by the same reference numerals.
[0069]
The cutting process of the magnetic tape is the same as that in FIG. 1, but the wide sheet 12 enters and exits via guide rolls 61 a and 61 b additionally installed on the entrance and exit sides of the wide sheet stabilizing device 40.
[0070]
Reference numeral 70 denotes a control panel, which monitors pressure measured by a manometer 62 provided in the housing 41, the state of the blower 63, and performs pressure control and the like.
[0071]
6 and 7, similarly to FIGS. 1 and 2, when the inside of the housing 41 is decompressed and a pulling force is applied, and the traveling is performed in a state where the pulling force and the tension caused by the feeding of the wide sheet 12 are balanced. The wide sheet 12 floats on the roll E.
[0072]
At this time, since the wide sheet portion wound on the roll E floats under the negative pressure, the roll E functions to specify (set) an area for equalizing the tension in the width direction. Further, the rolls D and F function to press sheets in an area other than the area specified by the roll E.
[0073]
As described above, by floating and running, the wide sheet 12 is uniformly tensioned over its entire width, and the corrugated shape of the sheet is improved.
[0074]
Further, the relation between the sheet lifting force (F) and the tension (T) is such that F <T is the same as in the case of FIG.
[0075]
The holding angle of the wide sheet 12 wrapped around the roll E exceeds 180 ° as shown in FIG. 8 (an enlarged view of the rolls E and F), and is larger than that of the embodiment of FIGS. Become. For this reason, the area receiving the negative pressure becomes large (for example, 4/3 times), and it is possible to suck up even a weak pressure.
[0076]
Therefore, the capacity of the exhaust device can be small, and the installation area and cost can be reduced.
[0077]
Also, according to the configuration of FIGS. 6 and 7, the roll installation area is smaller than in the case where three rolls A, B, and C are installed on the same plane as in FIGS. Is achieved.
[0078]
The wide sheet tension stabilizing device 40 is configured not only to pull up the wide sheet 12 in the vertical direction as described above but also to rotate the apparatus by a predetermined angle, for example, 90 °, and to pull the sheet in the horizontal direction. You may.
[0079]
Further, a plurality of the wide sheet tension stabilizing devices 40 may be interposed in the traveling path of the wide sheet.
[0080]
Next, an embodiment of the magnetic tape cutting method of the present invention will be described. In the present embodiment, a first step of sending a wide sheet-shaped magnetic tape from an unwinding roll, and a second step of sending the magnetic tape sent from the unwinding roll to a cutting unit by a pinch roll, A third step of cutting the magnetic tape sent from the pinch roll into a predetermined width by the cutting means, and a fourth step of winding the magnetic tape cut by the cutting means by a take-up roll; In the method for cutting a magnetic tape including, at least at the time of performing the second step, an area for equalizing the tension in the width direction of the sent magnetic tape is set, and the set area is set to the area of the magnetic tape. It is retracted in a direction perpendicular to the longitudinal direction and the width direction with a retracting force smaller than the tension in the longitudinal direction.
[0081]
At this time, the setting of the area for equalizing the tension in the width direction of the magnetic tape and the drawing in of the magnetic tape are performed using, for example, the wide sheet tension stabilizing device shown in FIGS.
[0082]
Further, the method of the present invention is not limited to being performed at the time of the second step of sending the magnetic tape from the pinch roll to the cutting means, and may be carried out at the time of the first step of sending the magnetic tape from the unwind roll.
[0083]
Next, an embodiment of the wide sheet tension stabilizer of the present invention will be described. In the present embodiment, a predetermined tension is applied to an apparatus for processing a wide sheet (a sheet having a distorted portion in the width direction) as a raw material, which is made of a material other than the magnetic tape, to produce a product. For example, a wide sheet tension stabilizing device shown in FIGS. 2 and 6 is interposed in a traveling path of a wide sheet traveling in a folded state in the same manner as described above.
[0084]
According to the present embodiment, the distorted shape of the wide sheet is reliably removed by the same operation as the operation described with reference to FIGS.
[0085]
This embodiment is particularly useful when applied to a functional polymer film (such as an optical film for an electronic display or a conductive film), and for removing a distorted portion thereof.
[0086]
Next, an embodiment of the method for stabilizing the tension of a wide sheet according to the present invention will be described. In the present embodiment, a magnetic tape or other wide sheet running in a state in which a predetermined tension is applied in the longitudinal direction, an area for equalizing the tension in the width direction is set, and the set area is The wide sheet is drawn in a direction perpendicular to the longitudinal direction and the width direction with a drawing force smaller than the tension in the longitudinal direction.
[0087]
At this time, the setting of the area for equalizing the tension in the width direction of the wide sheet and the drawing in of the wide sheet are performed using, for example, the wide sheet tension stabilizing device shown in FIGS.
[0088]
According to the present embodiment, the distorted shape of the wide sheet is reliably removed by the same operation as the operation described with reference to FIGS.
[0089]
This embodiment is particularly useful when applied to a functional polymer film (such as an optical film for an electronic display or a conductive film), and for removing a distorted portion thereof.
[0090]
Next, the variation of the cut tape width when the magnetic tape was cut by applying the present invention was measured under the following conditions, and the results are shown in FIG.
[0091]
The magnetic tape used in this measurement was obtained by applying a magnetic paint to a PET-based film (10.5 μm in thickness), cutting the total thickness to 13.6 μm, and cutting the film to a width of 12.65 mm. The number of measurement samples was 80,000 or more.
[0092]
In FIG. 9, the horizontal axis represents the tape width, and the vertical axis represents the measurement frequency. ₁ Shows the result of cutting with a conventional magnetic tape cutting machine, and the curve L ₂ Shows the result of cutting using the apparatus of the present invention.
[0093]
In FIG. 9, the average value (Mean Value) of the cutting tape width and the variation of the frequency distribution are shown by the standard deviation (Standard Deviation). The above unit is mm.
[0094]
From FIG. 9, it can be seen that the curve L according to the invention ₂ Is the curve L ₁ Since the curve is sharper than that, the standard deviation is changed from 0.0032 mm to 0.0023 mm, and it can be seen that the variation in the tape cutting width of about 1 μm is improved.
[0095]
【The invention's effect】
(1) As described above, according to the first to eleventh aspects of the present invention, the tension in the width direction of the wide sheet is made uniform, and the fluctuation of the sheet width and the occurrence of meandering can be suppressed. Therefore, the number of defective products can be reduced, the yield can be improved, and a uniform sheet without shape distortion can be obtained.
[0096]
For example, when the wide sheet is a sheet wound around a corrugated roll, the use of the tension stabilizing device of the present invention can reliably remove the shape distortion of the sheet caused by the corrugated roll.
(2) According to the third and fourth aspects of the present invention, it is possible to reliably specify an area for equalizing the tension in the width direction of the wide sheet.
(3) According to the fifth and sixth aspects of the present invention, the holding angle of the wide sheet of the first roll is increased, and the area for receiving the drawing force of the sheet is widened, so that only a small drawing force is required. . For this reason, the capacity and space of the drawing means, for example, the exhaust means can be reduced. Further, for example, the housing of the area setting means can be designed to be small, and the size of the apparatus can be reduced.
(4) According to the seventh and eighth aspects of the present invention, since a sealing structure using a mechanical seal is formed, the suction opening when the wide sheet is drawn in is narrowed, and the drawing force is stabilized.
(5) According to the ninth and tenth aspects of the present invention, the suction force (exhaust force) when the wide sheet is pulled in can be stabilized by adjusting the gap.
(6) According to the eleventh aspect of the present invention, the tension in the width direction of the wide sheet is made uniform, and the fluctuation of the sheet width and the occurrence of meandering can be suppressed. Therefore, the number of defective products can be reduced, the yield can be improved, and a uniform sheet without shape distortion can be obtained.
(7) According to the present invention as set forth in claims 12 to 21, in the magnetic tape cutting machine, the tension in the width direction of the wide sheet magnetic tape is made uniform, and the fluctuation of the tape width and the occurrence of meandering are reduced. It can be suppressed, and the cutting accuracy is improved. Therefore, the number of defective products can be reduced, the yield can be improved, and a uniform magnetic tape free of shape distortion can be obtained.
(8) Further, according to the present invention, an area for equalizing the tension in the width direction of the magnetic tape can be reliably specified.
(9) Further, according to the present invention as set forth in claims 16 and 17, the holding angle of the magnetic tape of the first roll is increased, and the area for receiving the pulling force of the tape is increased, so that only a weak drawing force is required. . For this reason, the capacity and space of the drawing means, for example, the exhaust means can be reduced. Further, for example, the housing of the area setting means can be designed to be small, and the size of the apparatus can be reduced.
(10) Further, according to the present invention described in claims 18 and 19, since the sealing structure by the mechanical seal is formed, the suction opening for drawing in the magnetic tape is narrowed, and the drawing force is stabilized.
(11) According to the present invention, the suction force (exhaust force) when the magnetic tape is drawn in can be stabilized by adjusting the gap.
(12) Further, according to the present invention as set forth in claim 22, it is possible to cut the wide-width sheet-shaped magnetic tape by equalizing the tension in the width direction and to suppress the fluctuation of the tape width and the occurrence of meandering. And cutting accuracy is improved. Therefore, the number of defective products can be reduced, the yield can be improved, and a uniform magnetic tape free of shape distortion can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a magnetic tape cutting machine according to the present invention.
2A and 2B show an embodiment of the present invention, wherein FIG. 2A is a front view and FIG. 2B is a side view.
FIG. 3 is an enlarged view of a main part of FIG. 2 (b).
FIG. 4 is an enlarged view of a main part of FIG. 2 (a).
FIG. 5 is an explanatory view of a main part of FIG. 2;
FIGS. 6A and 6B show another embodiment of the present invention, wherein FIG. 6A is a front view and FIG. 6B is a side view.
FIG. 7 is an overall configuration diagram showing another embodiment of the magnetic tape cutting machine of the present invention.
FIG. 8 is an enlarged view of a main part of FIG. 6 (b).
FIG. 9 is a graph showing the relationship between the tape width and the measurement frequency for explaining the effect of the present invention.
10A and 10B show a corrugated unwinding roll used in the present invention, wherein FIG. 10A is a cross-sectional configuration diagram of the roll, and FIG.
FIG. 11 is an explanatory diagram showing a result obtained when a wide sheet fed from an unwinding roll is cut by a cutting machine.
FIG. 12 is an explanatory diagram showing a result obtained when a wide sheet having a distorted portion sent out from an unwinding roll is cut by a cutting machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Unwinding roll, 12 ... Wide sheet, 13 ... Pinch roll, 14 ... Slitting knife, 15 ... Winding roll, 20, 40 ... Wide sheet tension stabilizer, 21, 41 ... Housing, 22 ... Roll clearance adjustment block 23, a gap adjusting plate, 24, a mechanical seal, 25, a pulley, 26, a belt, 27, a servomotor, 28a to 28c, an exhaust port, 29a to 29c, a pipe, 30, an exhaust device, 50, an exhaust path, 61a, 61b: guide roller, 62: manometer, 63: blower, 70: control panel.

Claims (22)

A wide sheet tension stabilizing device interposed in a traveling path of a wide sheet traveling in a state where a predetermined tension is applied in a longitudinal direction,
Area setting means which is in contact with one surface of the wide sheet and sets an area for equalizing the tension in the width direction,
Retraction means for retracting the wide sheet with a retraction force smaller than the tension in the longitudinal direction from the other side of the wide sheet opposite to the area setting means. Tension stabilizer. The retraction means,
A housing that surrounds a space from the area setting means to a portion separated by a predetermined distance on a side facing the area setting means,
The wide sheet tension stabilizing apparatus according to claim 1, further comprising an exhaust unit connected to a space in the housing and exhausting the inside of the space. The area setting means,
A first roll which is in contact with one surface of the wide sheet and is driven to rotate in accordance with a traveling speed of the wide sheet;
A second roll that is provided near the first roll, abuts against the other surface of the wide sheet, and is driven to rotate in accordance with the traveling speed of the wide sheet. The tension stabilizing device for a wide sheet according to claim 1, wherein The area setting means,
A first roll which is in contact with one surface of the wide sheet and is driven to rotate in accordance with a traveling speed of the wide sheet;
A second roll that is provided near the first roll, abuts against the other surface of the wide sheet, and is driven to rotate in accordance with the traveling speed of the wide sheet. The tension stabilizing device for a wide sheet according to claim 2, wherein The wide sheet tension stabilizer according to claim 3, wherein the diameter of the first roll is larger than the diameter of the second roll. The wide sheet tension stabilizer according to claim 4, wherein the diameter of the first roll is larger than the diameter of the second roll. The wide sheet tension stabilizer according to claim 4, wherein each end of the first and second rolls and the housing are hermetically sealed by a mechanical seal. 7. The wide sheet tension stabilizer according to claim 6, wherein each end of the first roll and the second roll and the housing are hermetically sealed by a mechanical seal. The device for stabilizing tension of a wide sheet according to claim 4, further comprising means for adjusting a gap between an outer peripheral portion of the second roll and the housing. The tension stabilizing device for a wide sheet according to claim 4, further comprising means for adjusting a gap between the first roll and the second roll. A method for stabilizing the tension of a wide sheet traveling in a state where a predetermined tension is applied in a longitudinal direction,
An area for equalizing the tension in the width direction of the running wide sheet is set, and the set area is smaller than the tension in the length direction in a direction orthogonal to the longitudinal direction and the width direction of the wide sheet. A method for stabilizing the tension of a wide sheet, characterized in that the sheet is drawn in by a drawing force. A magnetic tape comprising: an unwinding roll for feeding a wide sheet made of a magnetic tape; cutting means for cutting the sent wide sheet to a predetermined width; and a winding roll for winding the cut material by the cutting means. In the cutting machine,
An area between the unwinding roll and the cutting means, which is interposed in the traveling path of the wide sheet traveling with a predetermined longitudinal tension and abuts on one surface of the wide sheet to equalize the tension in the width direction. Area setting means for setting
A tension stabilizing device having a retraction means for retracting the wide sheet with a retraction force smaller than the tension in the longitudinal direction from the other surface side of the wide sheet and facing the area setting means. A magnetic tape cutting machine, characterized in that: The retraction means,
A housing that surrounds a space from the area setting means to a portion separated by a predetermined distance on a side facing the area setting means,
13. The magnetic tape cutting machine according to claim 12, further comprising an exhaust unit connected to a space in the housing and exhausting the inside of the space. The area setting means,
A first roll which is in contact with one surface of the wide sheet and is driven to rotate in accordance with a traveling speed of the wide sheet;
A second roll that is provided near the first roll, abuts against the other surface of the wide sheet, and is driven to rotate in accordance with the traveling speed of the wide sheet. The magnetic tape cutting machine according to claim 12, wherein The area setting means,
A first roll which is in contact with one surface of the wide sheet and is driven to rotate in accordance with a traveling speed of the wide sheet;
A second roll that is provided near the first roll, abuts against the other surface of the wide sheet, and is driven to rotate in accordance with the traveling speed of the wide sheet. The magnetic tape cutting machine according to claim 13, wherein: The magnetic tape cutter according to claim 14, wherein the diameter of the first roll is larger than the diameter of the second roll. The magnetic tape cutter according to claim 15, wherein the diameter of the first roll is larger than the diameter of the second roll. The magnetic tape cutting machine according to claim 15, wherein each end of the first roll and the second roll and the housing are hermetically sealed by a mechanical seal. The magnetic tape cutting machine according to claim 17, wherein each end of the first roll and the second roll and the housing are sealed by a mechanical seal. The magnetic tape cutting machine according to claim 15, further comprising a unit for adjusting a gap between an outer peripheral portion of the second roll and the housing. 15. The magnetic tape cutting machine according to claim 14, further comprising means for adjusting a gap between the first roll and the second roll. From the unwinding roll, a first step of sending out a wide sheet made of a magnetic tape, a pinch roll, a second step of sending out the wide sheet sent out of the unwinding roll to cutting means, and the cutting means, Cutting a magnetic tape including a third step of cutting the wide sheet fed from the pinch roll into a predetermined width, and a fourth step of winding the sheet cut by the cutting means with a take-up roll In the method,
At least during the execution of the second step, an area for equalizing the tension in the width direction of the fed wide sheet is set, and the set area is set in a direction orthogonal to the longitudinal direction and the width direction of the wide sheet. A magnetic tape cutting method, wherein the magnetic tape is drawn with a pulling force smaller than a longitudinal tension.

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