JP2000322735A - Magnetic tape cutting machine and method for cutting magnetic tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cutting machine which makes it possible to obtain uniform magnetic tapes. SOLUTION: This machine is provided with a shape absorber 8 having a cross-sectional shape corresponding to the cross-sectional shape of an un-winding roll 2 and sends a broad sheet 1 delivered from the un-winding roll 2 via pinch rolls 3 to the shape absorber 8. The displacement on the surface of the un-winding roll 2 is detected by plural micrometers fixed onto the un-winding roll 2 consisting of, for example, a drum-shaped roll. Next, the distance α obtained by subtracting the distance of another micrometer from a value (a) which is a reference for the position at the center of the un-winding roll 2 on the basis of the position is calculated. The cross-sectional shape of the shape absorber 8 is then determined in accordance with the measurement data of α. Of the surface of the shape absorber 8, the shape of the surface in contact with the broad sheet 1 is formed to the shape determined by the method described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic tape cutting machine and a magnetic tape cutting method.

[0002]

2. Description of the Related Art In a cutting step of a magnetic tape manufacturing process, a wide sheet-shaped tape (hereinafter, referred to as a "wide sheet") having been subjected to a surface treatment and a hardening treatment has a predetermined width and length. Disconnect. As a method of cutting, a method of cutting by a shearing force by passing a wide sheet between a pair of cutters composed of an upper blade and a lower blade is widely used. In a magnetic tape cutter, a wide sheet is fed from a feed roll to a cutter via a pinch roll, cut, and then wound on a take-up roll.

Usually, when cutting a wide sheet, tension is uniformly applied to all the tapes after cutting, that is, to all the channels. As shown in FIG. 7A, if the unwinding roll is a roll (cylindrical roll) wound with a uniform tension, a uniform magnetic tape having a substantially constant width b and a small meandering can be obtained.

On the other hand, if the shape of the base film is bad or if the thickness of the coating at the center becomes large during the coating process,
In some cases, a difference in thickness is accumulated, and a roll having a shape in which a central portion is raised in a cross section in the axial direction (hereinafter, referred to as a “drum-shaped roll”) is formed. In this drum type roll, the wide sheet is not wound with a uniform tension.

[0005]

When the above-mentioned drum-shaped roll or other unwinding roll in which the wide sheet is not wound with uniform tension is cut, the width of the tape after the cutting is changed or the shape of the tape is changed. There has been a problem that a uniform magnetic tape may not be obtained due to meandering.

That is, for example, when cutting is performed to a fixed width, the shape of the unwinding roll is directly reflected on the tape width as shown in FIG. 7B. With respect to the tape being widened or meandering in the shape of the tape, the tape may undulate in the plane direction, and the maximum amplitude of the waveform may exceed an allowable range. Conventionally, there has been no means for improving the shape and cutting the unwound unrolling roll in accordance with the shape when the unwinding roll is cut.

The present invention has been made in view of the above problems, and has as its object to provide a magnetic tape cutting machine and a magnetic tape cutting method capable of obtaining a uniform magnetic tape.

[0008]

According to the present invention, there is provided a magnetic tape cutting machine comprising: an unwinding roll for feeding a wide sheet; a slitter knife for cutting the wide sheet fed via a pinch roll into a predetermined width; A magnetic tape cutting machine including a take-up roll for taking up a material cut by a slitter knife, including a shape absorber described below. (B) The cross-sectional shape corresponds to the cross-sectional shape of the unwinding roll. (B) At least one is installed between the unwinding roll and the pinch roll, or between the pinch roll and the slitter knife or both.

Further, the method for cutting a magnetic tape of the present invention is as follows.
A first step of sending the wide sheet from the unwind roll, a second step of sending the wide sheet sent from the unwind roll to the slitter knife by a pinch roll, and a second step of sending the wide sheet from the pinch roll by a slitter knife. In a method for cutting a magnetic tape, the method comprises the following steps: a third step of cutting the wide sheet into a predetermined width, and a fourth step of winding the sheet cut by the slitter knife with a winding roll. The wide sheet is passed through the absorber. (I)
It has a cross-sectional shape corresponding to the cross-sectional shape of the unwinding roll. (B) At least one is provided between the first step and the second step, between the second step and the third step, or between both.

According to the magnetic tape cutting machine and the magnetic tape cutting method of the present invention, since the shape absorber has a cross-sectional shape corresponding to the cross-sectional shape of the unwinding roll, uniform tension is applied to the entire width of the wide sheet. be able to.

[0011]

Embodiments of the present invention will be described below. First, an embodiment of the invention relating to a magnetic tape cutting machine will be described with reference to FIGS. FIG. 1 is a conceptual diagram showing an example of an embodiment of the invention relating to a magnetic tape cutting machine. The unwinding roll 2 is formed by winding a wide sheet around a metal cylindrical core. The unwinding roll 2 sends out the wide sheet 1 to the pinch roll 3.

The unwinding roll 2 is shown in FIG.
This will be described in detail with reference to FIG. FIG. 2 is a perspective view showing an example of a measuring means for measuring the displacement of the surface of the unwinding roll 2 used in the magnetic tape cutting machine according to the present invention. Here, a drum-shaped roll is adopted as the unwinding roll 2.

In the drawing, a plurality of micrometers 7 are provided above the unwinding roll 2. The micrometer 7 is provided at each position with the unwinding roll 2
The surface shape of is read as a numerical value. That is, a plurality of the micrometers 7 are arranged in a line in the axial direction of the unwinding roll 2 so that the distance between the micrometer 7 and the unwinding roll 2 can be detected.

The information from the micrometer 7 is fed back to the cylinder of the shape absorber, whereby the cylinder operates as needed. The method for feeding back the information from the micrometer 7 to the cylinder of the shape absorber will be described later in detail. here,
The number of the micrometers 7 is at least three, that is, one at the center and one near each end in at least the axial direction of the unwinding roll 3.

As shown in FIG. 1, a pinch roll 3 is provided on the right side of the unwind roll 2 in the drawing. The pinch roll 3 has a function of adjusting the tension of the wide sheet 1 before cutting the wide sheet 1. However, as described above, conventionally, in the case of a drum roll, the tension is not uniform in the width direction of the wide sheet 1.

In the drawing, a shape absorber 8 is provided on the right side of the pinch roll 3. That is, the shape absorber 8
Is provided between the pinch roll 3 and the slitter knife 4. Here, the shape absorber 8 will be described in detail with reference to FIG. FIG. 3 is a perspective view showing an example of the shape absorber 8 of the magnetic tape cutter according to the present invention and means for changing the cross-sectional shape of the shape absorber 8. The shape absorber 8 has a cylindrical shape as can be seen from FIG. The axial length of the shape absorber 8 is, for example, 12 ″.
(304.8 mm) or 24 "(609.6 mm)
It can be. However, it is needless to say that the length is not limited to these.

The diameter of the shape absorber 8 is 80 mm to 500 mm.
mm. If the diameter is larger than 500 mm, there is a disadvantage that the installation space is increased. The shape absorber 8 is a non-rotating body, that is, a fixed body that does not rotate. In addition, as the material of the shape absorber 8, any material can be adopted as long as it can be flexibly deformed.

In the drawing, a plurality of cylinders 9 are provided below the shape absorber 8. The cylinder 9 changes the shape of the shape absorber 8 by operating. That is, in FIG. 3, the surface shape of the shape absorber 8 that is in contact with the wide sheet 1 can be changed by operating the cylinder 9. The cylinder 9 is configured to operate as needed based on the information of the micrometer 7 described above. Thereby, the shape absorber 8 has a cross-sectional shape corresponding to the cross-sectional shape of the unwinding roll 2. A method for making the cross-sectional shape of the shape absorber 8 correspond to the cross-sectional shape of the unwinding roll 2 will be described later in detail.

In the above-described example, the cylinder 9 is described as a means for changing the cross-sectional shape of the shape absorber 8.
It is not limited to this cylinder. In other words, other means than the cylinder may be used as long as they can dynamically deform the cross-sectional shape of the shape absorber 8.

As can be seen from FIG. 3, a plurality of air outlets 10 are provided on the surface of the shape absorber 8.
The air outlet 10 has a function of blowing compressed air to the wide sheet 1. This air outlet 10
Is preferably in the range of 2 mm to 4 mm. If the diameter of the air outlet 10 is smaller than 2 mm,
This is because the amount of air is insufficient and the capacity of the blower needs to be considerably increased. If the diameter of the air outlet 10 is larger than 4 mm, the amount of air is sufficient, but the wide sheet 1 may vibrate greatly in the direction perpendicular to the surface. By blowing compressed air onto the wide sheet 1 from the air outlet 10,
It is possible to prevent the wide sheet 1 from floating above the shape absorber 8 and to cause friction between the shape absorber 8 and the wide sheet 1.

In FIG. 1, a slitter knife 4 is provided on the right side of the shape absorber 8 in the drawing. The slitter knife 4 has a function of cutting the wide sheet 1 to a predetermined width by the shearing force of the upper blade and the lower blade.

In the drawing, a plurality of winding rolls 5 are provided on the right side of the slitter knife 4. The take-up rolls 5 take up the wide sheet 1 cut into a predetermined width by the slitter knife 4 one by one.

Next, an embodiment of the invention relating to a method of cutting a magnetic tape will be described with reference to FIGS. First, as shown in FIG. 1, the wide sheet 1 is fed from the unwinding roll 2. Next, the wide sheet 1 sent from the unwinding roll 2 by the pinch roll 3
To the shape absorber 8. Next, the wide sheet 1 sent from the pinch roll 3 is passed over the shape absorber 8. Next, the wide sheet 1 sent from the shape absorber 8 is cut into a predetermined width by the slitter knife 4. Next, the material cut by the slitter knife 4 is taken up by the take-up roll 5.

Here, the step of passing the wide sheet 1 fed from the pinch roll 3 onto the shape absorber 8 will be described in detail. That is, a method of making the cross-sectional shape of the shape absorber 8 correspond to the cross-sectional shape of the unwinding roll 2 will be described with reference to FIG. FIG. 4 is a diagram showing the steps from the step of measuring the distance to the unwinding roll to the step of operating each cylinder in the magnetic tape cutting method according to the present invention.

In FIG. 4, first, a step 51 for measuring the distance between each point of the unwinding roll and the reference plane is started.
In this step 51, as shown in FIG. 2, displacement of the surface of the unwinding roll 2 is detected by a plurality of micrometers 7 fixed on the unwinding roll 2 composed of, for example, a drum-shaped roll. That is, all the micrometers 7 are installed in the axial direction of the unwinding roll 2 and the distance between the micrometer 7 and each point on the surface of the unwinding roll 2 is measured.

Next, as shown in FIG. 4, the process proceeds to a step 52 for calculating a displacement α from the reference position a. At this time, the median a in the axial direction of the unwinding roll 2 is used as a reference. From the other values of the micrometer 7, the difference α from “a” is calculated. That is, it is possible to calculate the distance α obtained by subtracting the distance of another micrometer from the reference value a based on the center position of the unwinding roll 2.

Next, the process proceeds to a step 53 for determining the sectional shape of the shape absorber based on the measured data of α. The surface shape of the shape absorber 8 is determined by multiplying a constant K by the displacement α of the surface of the unwinding roll 2 from the reference value a. Thus, a shape having a displacement proportional to the displacement of the surface of the unwind roll 2 is determined. Here, the constant K is a constant determined by the diameter of the unwinding roll 2, the distance between the unwinding roll 2 and the slitter knife 4, and the like.

Although the shape having a displacement proportional to the displacement of the surface of the unwinding roll 2 has been described here, the shape is not limited to this. For example, various shapes such as a shape in which the median value and the values at both ends are connected by a straight line in the axial direction of the shape absorber 8 or a circular shape passing through the median value and the values at both ends can be adopted. In short, any shape can be employed as long as the tension in the width direction of the wide sheet 1 is made uniform by the shape derived from the surface shape of the unwinding roll 2. Therefore,
Of course, the surface shape of the shape absorber 8 may be a shape that is empirically derived in relation to the surface shape of the unwinding roll 2.

Next, the process proceeds to a step 54 for operating each cylinder. After the surface shape of the shape absorber 8 is determined by the above-described step 53, the piston rod of each cylinder is moved by the displacement of the surface shape at the point of each cylinder 9. As a result, the surface of the shape absorber 8 that contacts the wide sheet 1 moves by the same distance as the piston rod of the cylinder 9 has moved. Therefore, the shape absorber 8
Of the surfaces of the above, the shape of the surface that comes into contact with the wide sheet 1 is
The shape determined by the above method will be formed. As described above, the steps 51 to 54 described above are repeated, and the cross-sectional shape of the shape absorber 8 can be sequentially made to correspond to the cross-sectional shape of the unwinding roll 2.

As a result, since the shape absorber 8 has a cross-sectional shape corresponding to the cross-sectional shape of the unwinding roll 2, uniform tension can be applied to the entire width of the wide sheet 1. That is, this makes it possible to apply uniform tension to the entire width regardless of the shape of the unwinding roll 2 before cutting.

Whether the tension is uniformly applied in the width direction of the wide sheet 1 is determined during the operation of the tape cutting machine.
It can be confirmed visually. In addition, whether or not the tension is uniform can be confirmed using an apparatus. That is, for example, by installing a pressure sensor at the tip of the piston rod of a cylinder, if the pressure in each cylinder is detected, it is possible to detect the compression force proportional to the tension of the wide sheet 1 in that portion. As another method, the distribution of the tension in the width direction can be detected by independently applying the pressure sensor to the wide sheet 1 and detecting the pressure.

In the example described above, the displacement of the surface of the unwind roll 2 is measured by the micrometer 7, and
Although the surface shape of the shape absorber 8 is determined according to this displacement, the present invention is not limited to this method. For example, there is a method using only a pressure sensor without installing a micrometer. That is, since the tension distribution of the wide sheet 1 can be known by the pressure sensor, the object can also be achieved by adjusting the moving distance of the piston rod of each cylinder so as to make the tension distribution uniform.

As described above, according to the embodiment of the present invention, since the shape absorber 8 has a cross-sectional shape corresponding to the cross-sectional shape of the unwinding roll 2, a uniform magnetic tape can be obtained. That is, regardless of the shape of the unwinding roll, tension is uniformly applied to the entire width of the tape, so that the base is not properly shaped and the cutting accuracy is improved. 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 the number of defective products and improving the yield.

In the above-described embodiment of the present invention, the case where the shape absorber 8 is installed between the pinch roll 3 and the slitter knife 4 has been described. However, the present invention is not limited to this arrangement. Other arrangement methods can be adopted. FIG. 5 is a conceptual diagram showing another example of the embodiment of the invention relating to the magnetic tape cutting machine. That is, at least one shape absorber 8 can be installed between the unwinding roll 2 and the pinch roll 3 and / or between the pinch roll 3 and the slitter knife 4 or both. In the installation method, the wide sheet 1 can be installed not only in the lower surface direction but also in the upper surface direction in the drawing.

As shown in FIG. 5, when a plurality of shape absorbers 8 are installed, it is better to gradually correct with a plurality of shape absorbers 8 than to correct the distribution of tension with a single shape absorber 8. However, there is an advantage that a load is not applied to the wide sheet 1. However, when a plurality of shape absorbers 8 are provided, it is necessary to reduce the amount of displacement of the surface as compared with a single case.

Further, in the above embodiment of the present invention, the shape absorber 8 is described as being non-rotating, but it may be rotatable. In this case, since the surface shape of the shape absorber 8 needs to be rotationally symmetric, for example, a resilient cylindrical shape having a plurality of chambers for storing compressed air therein is manufactured. By adjusting the pressure in each room, a predetermined cross-sectional shape can be obtained.
In this way, by making the shape absorber 8 rotatable, the air outlet 10 as described in the above-described example can be used.
There is no need to provide

In the above-described embodiment of the present invention, the example in which the displacement of the surface of the unwinding roll 2 is measured by the micrometer 7 has been described. It is not limited to the one using a micrometer. Other methods can be employed. FIG. 6 shows a diagram for measuring the displacement of the surface of the unwinding roll.
It is a perspective view showing other examples of the measuring means used for the magnetic tape cutter concerning the present invention. As shown in FIG. 6, it is possible to use a technique of installing a plurality of detection cameras 11 and scanning the surface of the unwind roll 2. The use of the detection camera 11 has an advantage that the distance from the unwinding roll 2 can be detected in a non-contact manner as compared with the micrometer 7.

In the above embodiment of the present invention, an example in which the present invention is applied to a drum-type roll has been described. However, an object to which the present invention can be applied is not limited to this drum-type roll. . In other words, even if the central part of the unwinding roll has another shape such as a concave shape,
Of course, the present invention can be applied. In addition, the present invention is not limited to the above-described embodiment, but can adopt various other configurations without departing from the gist of the present invention.

[0039]

The present invention has the following effects. Since the shape absorber has a cross-sectional shape corresponding to the cross-sectional shape of the unwinding roll, a uniform magnetic tape can be obtained.

[Brief description of the drawings]

FIG. 1 is a first embodiment of the invention relating to a magnetic tape cutting machine.
It is a conceptual diagram showing an example.

FIG. 2 is a perspective view showing an example of a measuring means for measuring the displacement of the surface of the unwinding roll used in the magnetic tape cutting machine according to the present invention.

FIG. 3 is a perspective view showing an example of a shape absorber of the magnetic tape cutter according to the present invention and a means for changing a cross-sectional shape of the shape absorber.

FIG. 4 shows a magnetic tape cutting method according to the present invention.
It is a figure showing a process from a process of measuring a distance to an unwinding roll to a process of operating each cylinder.

FIG. 5 is a conceptual diagram showing another example of the embodiment of the invention relating to the magnetic tape cutting machine.

FIG. 6 is a perspective view showing another example of the measuring means for measuring the displacement of the surface of the unwinding roll used in the magnetic tape cutting machine according to the present invention.

FIG. 7 is a diagram showing a result obtained when a wide sheet fed from a cylindrical or drum-type unwinding roll is cut by a conventional cutting machine.

[Explanation of symbols]

1 ‥‥ wide sheet, 2 ‥‥ unwind roll, 3 ‥‥ pinch roll, 4 ‥‥ slitter knife, 5 ‥‥ take-up roll, 6 ‥‥ magnetic tape cutting machine, 7 ‥‥ micrometer,
8 ‥‥ shape absorber, 9 ‥‥ cylinder, 10 ‥‥ air outlet, 11 ‥‥ detection camera, 12 ‥‥ upper blade, 13 ‥
‥ Lower blade

Claims (2)

[Claims] 1. An unwinding roll for feeding a wide sheet, a slitter knife for cutting the wide sheet fed via a pinch roll into a predetermined width, and a winding roll for winding a sheet cut by the slitter knife. A magnetic tape cutting machine comprising: a magnetic tape cutting machine comprising the following shape absorber. (B) The cross-sectional shape corresponds to the cross-sectional shape of the unwinding roll. (B) At least one is installed between the unwinding roll and the pinch roll, or between the pinch roll and the slitter knife or both. A magnetic tape cutting machine, characterized in that: 2. A first step of feeding a wide sheet from an unwinding roll; a second step of sending the wide sheet fed from the unwinding roll to a slitter knife by a pinch roll; A method for cutting a magnetic tape, comprising: a third step of cutting the wide sheet fed from a pinch roll into a predetermined width; and a fourth step of winding the cut sheet with the slitter knife using a take-up roll. 3. The method for cutting a magnetic tape according to claim 1, wherein the wide sheet is passed through the following shape absorber. (B) The cross-sectional shape corresponds to the cross-sectional shape of the unwinding roll. (B) Between the first step and the second step, the second step and the third step
At least one is installed between any one or both of the steps. A method for cutting a magnetic tape, comprising: