JP2000221089A - Long body tension distribution measuring device, long body tension control device, and magnetic recording medium manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension distribution measuring device for a long body, a tension control device for a long body, and a uniform tension distribution in a width direction of a raw magnetic tape to produce a high quality magnetic tape. To provide an apparatus for manufacturing a magnetic recording medium. SOLUTION: Lower blade 10 and upper blade 11 in a manufacturing apparatus.
By the upstream side of the slitting step, the light L ₁ is irradiated from the light source 12 to the upper surface of the original film 1a traveling, to output the intensity of the reflected light L ₂ is detected by the CCD camera 13, the The output signal is compared with a reference value stored in the signal memory circuit 21 and further differentiated to obtain a measured value, and the tension of the dancer roll 9 is controlled based on the measured result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension distribution measuring device, a tension control device, and a magnetic recording medium in the width direction of a long body (for example, a raw film for a magnetic tape used for video and audio). Related to a manufacturing apparatus.

[0002]

2. Description of the Related Art A magnetic tape used for video, audio, and the like is formed by applying a magnetic layer material to a base film, forming a dried magnetic layer, and processing it into a wide and long magnetic sheet.
It is cut to a fixed width and wound up to complete.

A base film is generally manufactured using a stretched film-forming apparatus. For example, a molten material such as polyethylene terephthalate is stored in a raw material tank, and the raw material is continuously discharged from a nozzle of the tank. The raw material is formed into a wide film while being stretched, and after being subjected to a heat treatment, is wound up as a base film.

The wound base film is dried by applying a magnetic paint as shown in FIG. That is, the uncoated base film 29 wound around the hub 30
A is guided by guide rollers 31a, 31b, and 31c, is conveyed while being given an appropriate tension, passes through guide roller 32 and backup roller 33, is sandwiched between backup roller 33 and gravure roller 34, and is coated with magnetic paint 37. Is applied. The application of the magnetic paint rotates while partially immersing in a magnetic paint 37 filled in a paint tank 36, and excess paint is applied to one surface of the base film 29 </ b> A by a gravure roller 34 wiped by a doctor blade 35.

[0005] Base film 29 coated with magnetic paint
B passes through the guide rollers 38 and 39 and passes through the drying furnace 40
The magnetic paint is dried by hot air while passing through, and becomes a magnetic sheet 29C. The magnetic layer is flattened through a calendar section 41 composed of a number of rollers 42, and is wound around a hub 43 to form an original film 29D.

Further, as shown in FIG. 10, the raw film 29D is cut into, for example, a width of 8 mm by a cutting device to form a magnetic tape.

The original film 29D of the magnetic tape is mounted on the payout hub 44 together with the core, and the rolls 45A, 45
The driving nip roll 45 made of B makes the upper blade 46A,
It is sent to a cutting machine 46 having a lower blade 46B, where it is cut into a predetermined width to form a magnetic tape, which is separated every other and divided into two magnetic tape groups.

The two divided magnetic tape groups are guided by guide rollers 47A and 47B, respectively, and conveyed by driving nip rolls 49A and 49B composed of a pair of rolls 48A and 48B, respectively, and are taken up by winding hubs 50A and 50B. 50B, pancake 51A,
51B. The pancake is a term indicating a long magnetic tape that is wound and cut into a predetermined length.

However, in the process of manufacturing such a magnetic tape, when a base film or a raw film (hereinafter, referred to as a raw film) is run around a roller in the manufacturing process, the raw film is affected. If the tension is not appropriate, a defect occurs in the raw film. For example, if the tension applied to the original film is too large, the original film may be torn, and if the tension is too small, the original film may sag and overlap to form wrinkles. In particular, since the coating surface is not uniform in the coating device, the cutting line is not uniform in the cutting device, and the winding portion is badly wound because it is wound up with a bad effect. However, if the tape is cut as it is, the quality of the magnetic tape will be greatly affected.

In other words, if the tension distribution is abnormal due to the presence of a slack in the original film or the like, even if slitting to a magnetic tape having a predetermined width, this abnormality will follow the product,
For example, the magnetic tape is likely to bend in the width direction. As a result, in the cassette deck, the tape edge is damaged by meandering, and a change in the recording area has a significant effect on recording and reproduction.

Therefore, as a countermeasure against this, conventionally, the tension of the raw film has been detected and the tension applied thereto has been adjusted. Conventionally, to detect the tension applied to the raw film, a method of detecting the load applied to this load cell by incorporating a load cell (differential transformer type) etc. into a roll (guide roll, etc.) on which the raw film travels is used. Had been taken.

[0012]

However, in the detection by the load cell, the detection can be performed only at the roll position where the load cell is incorporated, and the tension cannot be detected at an arbitrary position. Further, in any of the apparatuses, the tension distribution in the width direction of the raw film could not be measured.

Therefore, as another solution, a device for detecting the tension in the width direction (Japanese Patent Application Laid-Open No. 7-209108, Japanese Patent Application Laid-Open
21715, and JP-A-8-21716). In these methods, compressed air is blown from a nozzle onto a sheet, and the displacement of the sheet is measured by a sensor.If this method is used to measure the tension of the original film of magnetic tape, the compressed air becomes a disturbance of the tension and the tension fluctuation occurs. And accurate measurements cannot be made. At present, there is no sensor that accurately detects the displacement of the raw film, and there is no effective solution at present.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-quality elongate body at a low cost by making the tension distribution in the width direction of a wide elongate body such as a raw magnetic tape uniform. An object of the present invention is to provide a body tension distribution measuring device, a long body tension control device, and a magnetic recording medium manufacturing device.

[0015]

That is, according to the present invention, the light from the light irradiating means is applied to the elongated body, and the light from the elongated body corresponding to the surface condition of the elongated body is received by the light receiving means. The present invention relates to a long-body tension distribution measuring device (hereinafter, referred to as a measuring device of the present invention) in which light is received and a tension distribution of the long body is detected from an output of the light-receiving means.

According to the present invention, the light from the elongate body corresponding to the surface condition of the illuminated elongate body is received by the light receiving means by the light irradiating means, and is output from the light receiving means as information on the surface state. Since the tension distribution of the long body is detected, if the tension in the manufacturing process of the long body is controlled based on the detection result, the tension can be kept uniform and a good quality long body can be obtained. it can. Moreover, because it is optical detection,
Arbitrary locations can be measured without any fluctuation in tension as affected by external pressure. As a result, it is possible to increase the productivity and reduce the cost of the elongated body.

Further, according to the present invention, the light from the light irradiating means is irradiated to the elongated body, and the light from the elongated body corresponding to the surface condition of the elongated body is received by the light receiving means. The tension distribution of the elongated body is detected from the output of (1), and the tension of the elongated body is controlled based on this detection information (hereinafter, referred to as a control device of the present invention). It is related to.

According to the present invention, there is provided a control device having the same effect as the measuring device, since the tension of the elongated body is controlled based on the detection information by the measuring device of the present invention. Can be.

Further, according to the present invention, a long object to be processed into a magnetic recording medium is conveyed to a predetermined processing step such as application of a magnetic paint, drying and slitting. The elongated body is irradiated, and light from the elongated body corresponding to the surface state of the elongated body is received by a light receiving unit, and a tension distribution of the elongated body is detected from an output of the light receiving unit. The present invention relates to a magnetic recording medium manufacturing apparatus (hereinafter, referred to as a manufacturing apparatus of the present invention) in which the tension of the elongated body is controlled based on information.

According to the present invention, since the above-described measuring device and control device of the present invention are applied, it is possible to provide a manufacturing apparatus having the same effects as described above.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

In the above-described measuring apparatus, control apparatus, and manufacturing apparatus of the present invention, as shown in FIG. 1, the light source 12 as the light irradiating means and the optical sensor 13 as the light receiving means are composed of the elongated body. respectively arranged 1a and in a non-contact state, the long reflected light L ₂ or transmitted light from elongated body 1a is incident on the light sensor 13, the control signal based on the detection information obtained from the output of the photosensor 13 It is desirable that the control signal is fed back to the tension control means of the elongated body 1a.

As shown in FIG. 2, a light source 12 as the light irradiating means and an optical sensor 1 as the light receiving means are provided.
3 are arranged along the width direction of the long body 1a, respectively, and the tension at the position in the width direction of the long body 1a is preferably measured.

In this case, at least a plurality of the light receiving means are provided in the width direction of the elongated body 1a so as to receive light over the entire width direction, and the light receiving means is a charge-coupled solid-state imaging device. Desirably, it is composed of an element (for example, a CCD camera).

The above-mentioned measuring device is used for the long body 1
a, and preferably on the downstream side of the dancer roll 9, as shown in FIGS. 1 and 2.
It is desirable that light is irradiated to the light and the light is received.

Then, as shown in FIG. 3, the amount of light received by the light receiving means is output as an electric signal A corresponding thereto, and this output signal A is compared with the reference value stored in the signal memory circuit 21 by the comparison amplifier 17. It is preferable that the tension in the width direction of the elongated body 1a is detected at each position in the width direction by being output as the signal B in comparison.

Further, it is preferable that after the electric signal is normalized, the electric signal is differentiated by a differentiating circuit 18 and the differentiated electric signal C is compared with the reference value.

As a result, when the elongated body is an original film of a magnetic recording medium, it can be processed into a high-quality tape-shaped magnetic recording medium, and as shown in FIG. The long body 1a as a raw material is cut into a tape having a predetermined width, so that a high-quality magnetic tape can be obtained.

[0029]

Embodiments of the present invention will be described below in detail.

According to the preferred embodiment of the present invention described above, a magnetic tape manufacturing apparatus having a measuring device and a control device was manufactured.

FIG. 1 is a schematic view showing a part of a magnetic tape manufacturing apparatus according to this embodiment, and FIG. 2 is a plan view of FIG.

The raw film 1a runs on the guide roll 2a, is transported sandwiched between the infeed rolls 8a and 8b, passes through the guide roller 2b, the dancer roll 9, and the guide roller 2c, and passes through the lower blade 10 for cutting. Is cut to a predetermined width by the upper blade 11 to form the magnetic tape 1b.

The lower blade 10 and the upper blade 11 are AC motors 3b
, And rotates at the line running speed. The rotation of the motor 3b is controlled by a vector inverter 4b, and the number of rotations is detected by a pulse generator 5b and fed back to the vector inverter 4b to be controlled with high accuracy.

The tension at the time of cutting by the lower blade 10 and the upper blade 11 is controlled by the pressure of a cylinder (not shown) connected to both ends of the dancer roll 9, and the pressure of the cylinder is controlled by an EP (electro-pneumatic converter) converter. Electrical control is performed by 7a and 7b. Further, the position of the dancer roll 9 is detected by the cell detector 6a, which is a position detector, and the necessary pressure is applied to the raw film 1a by the infeed rolls 8a and 8b so that the dancer roll 9 is always located at the center, and the nip is nipped. Control is performed by 8a and 8b.

The in-feed roll 8a is driven by an AC motor 3a, and the AC motor 3a is controlled by a vector inverter 4a. The rotation speed is detected by a pulse generator 5a, and the rotation speed is detected by the vector inverter 4a.
The rotation of the motor 3 is controlled with high precision by feeding back to a.

[0036] Then, the tension distribution detection in the width direction of the raw film 1a, the detection of the reflected light L ₂ of the outgoing light L ₁ of the light source 12 installed in an angle to the regular reflection on the traveling line top of raw film 1a The detection is performed by the CCD camera 13 and a determination is made as shown in a circuit of FIG.

The principle of detecting the tension distribution in this embodiment is as follows.
Light L ₁ from light source 12 reflected on the surface of raw film 1a
Is converted into an electric signal by the CCD camera 13, and the tension distribution is determined based on the strength of the signal. That is, when the tension distribution in the width direction of the raw film 1a is constant and normal, the light source 1 is used.
Light L ₁ from 2 is photographed without disturbance to the magnetic tape 1a plane.

Therefore, if the tension in the width direction of the raw film 1a is uniform, the output signal A of the CCD camera 13 is always constant and does not change. light L ₁ disturbed on the surface of the film 1a is photographed, also changes the signal a of the CCD camera 13. Therefore,
The signal A when the tension distribution is constant (normal) is stored, and the tension distribution is detected by constantly comparing the difference between the normal waveform and the current waveform.

In FIG. 1, the portion below the imaginary line shows the inside of a control box that comprehensively controls the above-described control mechanisms, and is used for comprehensively controlling the tension setting of the dancer roll 9 and the speed setting of the drive motors 3a and 3b. Further, a mechanism including the circuit of FIG. 3 described below is provided.

FIG. 3 is a block diagram of a circuit for controlling the operation of each unit for performing the tension distribution measurement and the tension control according to the present embodiment.

The output of the CCD camera 13 is an amplification amplifier 16
And is output as a signal A. When the present manufacturing apparatus is operated, first, the tension distribution of the raw film 1a at the position where the measurement is started is made constant, the memory switch 19 is turned on, and the signal with the constant tension distribution (normal) is stored in the signal memory circuit 21.
To memorize. After the operation, the amplified signal A from the CCD camera 13 is compared with a reference signal stored in the signal memory circuit 21 in a normal state by the comparison amplifier 17 and output as a signal B. Of the output signal B of FIG.

The differentiating circuit 18 outputs the differentiated value as a signal C to the signal comparing circuits 24 and 25. And this signal C
Is the plus abnormal level or the minus abnormal level set by the plus abnormal level voltage setting circuit 22 and the minus abnormal level voltage setting circuit 23 and the signal comparing circuit 2
4 or the signal comparison circuit 25. Then, the position in the width direction of the detected abnormal portion is determined by the position determination circuit 26 and output as an operator side signal 27a or a drive side signal 27b.

As described above, the signals A, B, and C output from the circuit shown in FIG. 3 are recorded on an oscilloscope (not shown) arranged in parallel. 4 to 8 show examples of recording data of the raw film 1a in the process of manufacturing the magnetic tape 1b shown in FIG. 1, FIG. 4 shows a portion where the tension distribution is uniform, FIG. 7 show that there is a portion where the tension is not uniform due to slack or the like in the D portion surrounded by the circle.

As described above, the signal A is output from the CCD camera 1
The signal B is a signal obtained by comparing the signal of the CCD camera 13 with the reference signal stored in the signal memory circuit 21 in the normal state, and the signal C is a signal obtained by amplifying the signal of No. 3 by the amplifier 16. This is a signal obtained by differentiating the signal B by the differentiating circuit 18. Therefore, if there is an abnormal part in the tension based on the above-mentioned oscilloscope recording data, the tension is adjusted as follows.

That is, the position where the tension is not uniform is output as the operator side signal 27a or the drive side signal 27b as shown in the circuit diagram of FIG. 3, so that when the operator side signal 27a is ON, the dancer roll In contrast, when the drive side signal 27b is ON, the command of the EP converter 7b of the dancer roll 9 is added.
By this operation, the tension distribution in the width direction of the raw film 1a can be uniformly adjusted.

According to this embodiment, the tension distribution in the width direction is measured at the upstream position immediately before the slitting step by the lower blade 10 and the upper blade 11 of the running raw film 1a,
While recording the abnormal state on the oscilloscope with respect to the normal value in which the tension is uniform, control is performed so that there is no abnormality, the tension distribution is made uniform, and the magnetic tape 1b is cut.
The magnetic tape 1b can be commercialized as a high-quality tape having no curvature in the width direction. Then, by feeding back the measured information and reflecting it in the next step, the productivity can be further increased.

The above embodiment can be modified based on the technical idea of the present invention.

For example, a light source other than a fluorescent lamp may be used, and any light source capable of irradiating high-frequency light can be suitably used. In the above-described embodiment, the reflected light of the light emitted from the light source is detected by the CCD camera. However, for example, when the object to be measured is a transparent body, the tension distribution may be measured by measuring the amount of transmitted light. it can.

Also, for example, a CCD camera as an optical sensor widens the viewing angle by using a wide-angle lens or the like.
The number of cameras is not limited to the embodiment as long as the irradiation surface can be photographed in a wide range. Further, any other fixed image pickup device having the same function as the CCD camera can be used.

The arrangement of the light source and the CCD camera, the control mechanism, and other configurations can be arbitrarily configured as long as they have the same functions as those of the above-described embodiment.

The object to be measured is not limited to the raw film for magnetic tape, but may be applied not only to the production process of a base film cut into a raw material, for example, after applying a magnetic paint, but also to other wide and long members. Measurement of tension distribution, or light source and C
If the CD camera is made movable, it can be applied to the measurement of distortion of a flat surface of a measured object in a stationary state.

[0052]

As described above, according to the present invention, the light from the light irradiating means is applied to the elongated body, and the light from the elongated body corresponding to the surface state of the elongated body is applied to the elongated body. Light is received by the light receiving means as information, and the tension distribution of the elongated body is detected from the output of the light receiving means. If the tension in the manufacturing process of the elongated body is controlled based on the detection result, the tension becomes uniform. And a good quality long body can be obtained. In addition, since the optical detection is used, an arbitrary portion can be measured without causing a fluctuation in tension due to the influence of the external pressure. As a result, it is possible to increase the productivity and reduce the cost of the elongated body.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a part of a magnetic tape manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a block diagram showing the same circuit.

FIG. 4 is data showing a tension distribution of a part of a raw film recorded on an oscilloscope according to the embodiment.

FIG. 5 is data showing a tension distribution of another portion of the raw film recorded on the oscilloscope according to the embodiment.

FIG. 6 is data showing tension distribution of another portion of the raw film recorded on the oscilloscope according to the embodiment.

FIG. 7 is data showing the tension distribution of another portion of the raw film recorded on the oscilloscope according to the example.

FIG. 8 is data showing a tension distribution of still another portion of the raw film recorded on the oscilloscope according to the embodiment.

FIG. 9 is a schematic view showing a part of steps in a conventional magnetic tape manufacturing apparatus.

FIG. 10 is a schematic diagram showing another part of the process in the magnetic tape manufacturing apparatus according to the conventional example.

[Explanation of symbols]

1a: raw film, 1b: magnetic tape, 2: guide roller, 3: motor, 4: inverter, 5: pulse generator, 6: selcin (position detector), 7: EP
Converter, 8: Infeed roll, 9: Dancer roll, 10: Lower blade, 11: Upper blade, 12: Light source, 13 ...
CCD camera, 16: amplification amplifier, 17: voltage comparison circuit, 18: signal differentiation circuit, 19: signal storage switch, 2
1 ... Signal memory circuit, 22 ... Positive side abnormal level voltage setting circuit, 23 ... Negative side abnormal level voltage setting circuit,
24, 25: signal comparison circuit, 26: position determination circuit, 27
a: operator side signal, 27b: drive side signal, A: detection signal, B: comparison signal, C: differentiation signal, D
… Uneven part, L ₁ … outgoing light, L ₂ … reflected light

Claims (28)

[Claims] 1. An elongated body is irradiated with light from a light irradiating unit, and light from the elongated body corresponding to a surface state of the elongated body is received by a light receiving unit. An elongated body tension distribution measuring device that detects the elongated body tension distribution. 2. A light source as said light irradiating means and an optical sensor as said light receiving means are respectively arranged in a non-contact state with said elongated body, and reflected light or transmitted light from said elongated body is said light. The tension distribution measuring device for a long body according to claim 1, which is incident on a sensor. 3. The elongate body according to claim 1, wherein the light irradiating unit and the light receiving unit are arranged along a width direction of the elongated body, and a tension at a position in the width direction of the elongated body is measured. Measuring device for tension distribution of long body. 4. An amount of light received by the light receiving means is output as an electric signal corresponding thereto, and the output signal is compared with a reference value, so that a tension in the width direction of the elongated body is changed at each position in the width direction. The tension distribution measuring device for a long body according to claim 3, which is detected. 5. The apparatus for measuring the tension distribution of a long body according to claim 4, wherein the electric signal is differentiated after being normalized, and the differentiated electric signal is compared with the reference value. 6. The elongated body according to claim 3, wherein at least a plurality of the light receiving means are provided in a width direction of the elongated body, and are configured to receive light over the entire width direction. Tension distribution measuring device. 7. The apparatus according to claim 1, wherein the light receiving means comprises a charge-coupled solid-state imaging device. 8. The apparatus for measuring the tension distribution of a long body according to claim 1, wherein the apparatus is provided on a conveyance path of the long body. 9. The tension distribution measuring device for a long body according to claim 8, wherein the long body is irradiated with light on a downstream side of the dancer roll, and the light is received. 10. An elongated body is irradiated with light from a light irradiating unit, and light from the elongated body corresponding to a surface state of the elongated body is received by a light receiving unit. A tension control device for a long body, wherein a tension distribution of the long body is detected, and the tension of the long body is controlled based on the detected information. 11. A light source as said light irradiating means and an optical sensor as said light receiving means are respectively arranged in a non-contact state with said elongated body, and reflected light or transmitted light from said elongated body is said light. The elongate device according to claim 10, wherein a control signal is obtained based on the detection information obtained from an output of the optical sensor when the light is incident on a sensor, and the control signal is fed back to a tension control unit of the elongate member. Body tension control device. 12. The light irradiation means and the light receiving means are respectively arranged along a width direction of the elongated body, and a tension at a position in the width direction of the elongated body is measured and controlled. 10. The tension control device for a long body according to 10. 13. An amount of light received by the light receiving means is output as an electric signal corresponding thereto, and the output signal is compared with a reference value, so that the tension in the width direction of the elongated body is changed at each position in the width direction. The tension control device for a long body according to claim 12, which is detected and controlled. 14. The tension control device for a long body according to claim 13, wherein the electric signal is differentiated after being standardized, and the differentiated electric signal is compared with the reference value. 15. The elongate body according to claim 12, wherein at least a plurality of said light receiving means are provided in a width direction of said elongate body, and are configured to receive light over the whole of said elongate body. Tension control device. 16. The tension control device for a long body according to claim 10, wherein said light receiving means comprises a charge-coupled solid-state imaging device. 17. provided on a transport path of the elongated body,
The tension control device for a long body according to claim 10. 18. The tension control device for an elongated body according to claim 17, wherein the elongated body is irradiated with light on a downstream side of the dancer roll, and the light is received. 19. A long body to be processed into a magnetic recording medium is conveyed to a predetermined processing step, and light from a light irradiating unit is irradiated on the long body along this conveyance path, and the surface of the long body is conveyed. Light from the elongate body corresponding to the state is received by the light receiving means, the tension distribution of the elongate body is detected from the output of the light receiving means, and the tension of the elongate body is controlled based on this detection information. A magnetic recording medium manufacturing apparatus. 20. A light source as said light irradiating means and an optical sensor as said light receiving means are respectively arranged in a non-contact state with said elongated body, and reflected light or transmitted light from said elongated body is said light. 20. The magnetic recording according to claim 19, wherein a control signal is obtained based on the detection information obtained from an output of the optical sensor after being incident on a sensor, and the control signal is fed back to a tension control unit of the elongated body. Media manufacturing equipment. 21. The light irradiation means and the light receiving means are respectively arranged along a width direction of the elongated body, and a tension at a position in the width direction of the elongated body is measured and controlled. 20. The apparatus for manufacturing a magnetic recording medium according to 19 above. 22. An amount of light received by the light receiving means is output as an electric signal corresponding thereto, and the output signal is compared with a reference value, so that tension in the width direction of the elongated body is changed at each position in the width direction. 22. The apparatus for manufacturing a magnetic recording medium according to claim 21, wherein the apparatus is detected and controlled. 23. The apparatus for manufacturing a magnetic recording medium according to claim 22, wherein the electric signal is normalized and then differentiated, and the differentiated electric signal is compared with the reference value. 24. The magnetic recording medium according to claim 21, wherein at least a plurality of the light receiving means are provided in a width direction of the elongated body, and are configured to receive light over the entire width direction. manufacturing device. 25. The apparatus for manufacturing a magnetic recording medium according to claim 19, wherein said light receiving means comprises a charge-coupled solid-state imaging device. 26. The apparatus for manufacturing a magnetic recording medium according to claim 19, wherein the elongated body is irradiated with light on the downstream side of the dancer roll, and the light is received. 27. The apparatus for manufacturing a magnetic recording medium according to claim 19, wherein said elongated body is processed into a tape-shaped magnetic recording medium. 28. The apparatus for manufacturing a magnetic recording medium according to claim 26, wherein the elongated body is cut into a tape shape at a position downstream of the dancer roll.