JP4726053B2 - Magnetic tape winding method and magnetic tape winding device - Google Patents

Description

The present invention, winding process of the magnetic tape, and relates to a take-up equipment of the magnetic tape, to a technique for improving the integer winding resistance.

  Tape cartridges that use magnetic tape as a recording medium include audio and video tape cartridges that have a pair of left and right tape reels inside the main body case, and computer data backup that has a single tape reel inside the main body case. There is a single reel type tape cartridge. In any of these forms, the magnetic tape is assembled in the main body case while being wound around the tape reel.

  A general method for producing such a magnetic tape will be described in detail. First, a magnetic layer, a back layer, etc. are coated on the nonmagnetic support, or between the nonmagnetic support and the magnetic layer as necessary. A non-magnetic layer is applied and a so-called jumbo roll is manufactured through a drying process, a calendar process, and the like. Next, the wide magnetic sheet sent out from the jumbo roll is cut into a predetermined width dimension with a slitter, and a predetermined length of the magnetic tape is cut out from the pancake around which the cut magnetic tape is wound, This is wound around the reel hub of the tape reel.

  As described above, a special apparatus, that is, a magnetic tape winder (referred to as a winder) is used to wind a magnetic tape having a predetermined length from a pancake around a reel hub. At this time, it is important that the tape is brought to one side of the reel flange and wound so that the winding surface is flat (winding). This is an extremely important task in order to prevent the tape from being bent during transportation and the occurrence of an error rate during repeated running, as well as appearance problems.

  For this reason, various devices have been made to wind the reel on the reel. As a general method, (1) a touch roll method is a method of winding while applying a roller to a portion where the magnetic tape is wound, and (2) touch is a method of winding while applying a belt to a portion where the magnetic tape is wound. Belt method, (3) air jet method that is a method of winding while injecting air to the reel hub portion around which the magnetic tape is wound, (4) a magnet method that is a method of winding the magnetic tape to be wound by magnetizing it in a certain direction, (5) A taper guide roller method, which is a method of winding while the winding direction is biased in a certain direction by a tapered guide roller, can be mentioned. However, none of these methods is sufficient as a method for controlling the winding position, and actually the winding state of the magnetic tape is controlled by combining several methods.

  Separately from this, when winding the magnetic tape, a temperature difference is given in the width direction of the magnetic tape under a low tension (a tension of 0.02 to 0.49 N / cm), and the nonmagnetic support is provided on the higher temperature side. A magnetic tape winding method in which a temperature higher than the glass transition temperature (Tg) of the body is applied and the semi-permanent thermal shrinkage is applied to bias the biased side toward the contracted side (Patent Document 1 by the present applicant) Temperature difference in the width direction of the magnetic tape under high tension (tensile 0.98 to 4.9 N / cm), and the glass transition temperature (Tg) of the non-magnetic support on the higher temperature side. Also proposed is a magnetic tape winding method (see Patent Document 2 of the present application) in which a higher temperature is applied and semi-permanent thermal stretching is performed to bias the bias toward the opposite side of the stretched side. ing.

JP 2004-158070 A JP 2004-158071 A

  The winding method shown in the above (1) to (5) is a method of forced makeup winding, so even if the winding is performed in this way, the winding effect is lost if it is driven by a drive. It is easy to break, and it is inevitable that a single layer jumps out or is disturbed.

  The methods described in Patent Documents 1 and 2 are semi-permanent winding methods for applying a curvature to a magnetic tape. However, the above-mentioned magnetic tape cut to a predetermined width from the jumbo roll has a variation in the amount of curvature depending on the position in the width direction of the jumbo roll and the position in the length direction. Even if it was applied, it was not possible to obtain a magnetic tape with excellent winding properties, which was disadvantageous. The curvature here refers to the degree of curvature of the magnetic tape, and the magnetic tape is naturally flatly placed on a horizontal and flat surface, from the reference line connecting both ends of the tape edge to the tape edge. This refers to the maximum distance (see Magnetic Media Technical Manual No. 6, “Characteristics and Performance of Magnetic Media”, March 1993, page 23 of the Japan Magnetic Media Industry Association).

  The present invention has been made to solve the above-described problems of the prior art, and can provide a preferable range of curvature over the entire length of the magnetic tape. Therefore, the magnetic material has excellent winding properties over the entire length. An object of the present invention is to provide a magnetic tape winding device and a magnetic tape winding method capable of obtaining a tape.

  In order to achieve the above object, the present inventors have conducted intensive studies, and as a result, after applying a curvature to the magnetic tape in the same manner as in Patent Document 1 and Patent Document 2, the amount of the applied curvature Is detected in real time, and the amount of curvature applied to the magnetic tape is feedback controlled based on the detection result, it is possible to accurately provide a suitable amount of curvature over the entire length of the magnetic tape, and therefore the winding characteristics. The present invention was completed by finding that a magnetic tape excellent in the above can be obtained.

That is, as shown in FIG. 1, the present invention detects a curvature applying step for applying a curvature to the magnetic tape 1 fed from the supply shaft 2, and a curvature applied to the magnetic tape 1 by the curvature applying step. A curvature amount detecting step, and a step of winding the magnetic tape that has undergone the curvature amount detection step by the take-up shaft 3, wherein the curvature amount detection means detects the curvature amount by an air pressure sensor, and the air pressure The sensor includes a detection body including a tape sliding surface on which the magnetic tape is slid and a blowout port for blowing air to the magnetic tape sliding on the tape sliding surface. based on the detection result by the amount detecting step, a Kabacha amount given to the magnetic tape 1 in the Kabacha application step Characterized in that the heat control given to the care tape are as a feedback control.

Further, as shown in FIG. 1, the present invention has a tape running system extending from the supply shaft 2 to the take-up shaft 3, and winds the magnetic tape 1 wound up by the take-up shaft 3. For take-up devices. In the middle of the tape running system, a curvature applying means 6 for applying a curvature to the magnetic tape 1 and a downstream side of the tape running system with respect to the curvature applying means 6 are arranged. A curvature amount detecting means 9 for detecting the curvature amount given to 1 is provided. The curvature amount detecting means detects a curvature amount by an air pressure sensor. The air pressure sensor slides on the tape sliding surface on which the magnetic tape slides and slides on the tape sliding surface. A detection body including an air outlet for blowing air to the moving magnetic tape is included. Based on the detection result by the curvature amount detection means 9, the curvature applying amount applied to the magnetic tape 1 by the curvature applying means 6 is magnetic. The feedback control is performed by controlling the amount of heat applied to the tape .

  In the magnetic tape winding method according to the present invention, after applying a curvature to the magnetic tape 1, the amount of applied curvature is detected in real time, and the amount of curvature applied to the magnetic tape 1 based on the detection result. Feedback control. Therefore, the amount of curvature applied to the magnetic tape 1 before processing by the method of the present invention varies depending on the position in the width direction and the length direction of the original jumbo roll, and as a result, according to the present invention. Even if the amount of curvature applied to the magnetic tape 1 in the curvature applying step deviates from a predetermined value, this can be detected and fed back immediately to correct the amount of curvature applied in the curvature applying step to an appropriate amount. it can. As a result, a suitable curvature amount can be accurately given over the entire length of the magnetic tape 1, and the magnetic tape 1 having excellent winding properties can be obtained.

  Similarly, in the magnetic tape winding device according to the present invention, the curvature is applied to the magnetic tape 1 by the curvature applying means 6 prior to the winding of the magnetic tape 1, and the curvature amount applied by the curvature amount detecting means 9 is further applied. The detection is performed in real time, and the curvature amount given by the curvature giving means 6 is feedback-controlled based on the detection result. Therefore, the amount of curvature applied to the magnetic tape 1 before the processing by the apparatus of the present invention varies depending on the position in the width direction and the length direction of the original jumbo roll, and as a result, according to the present invention. Even when the amount of curvature applied to the magnetic tape 1 by the curvature applying means 6 deviates from a predetermined value, this is immediately detected by the curvature amount detecting means 9 and fed back to the curvature applying means 6 to be applied to the curvature applying means. The amount of curvature given by 6 can be corrected to an appropriate amount. As a result, a suitable curvature amount can be accurately given over the entire length of the magnetic tape 1, and the magnetic tape 1 having excellent winding properties can be obtained.

  In the present invention, the amount of curvature finally applied to the magnetic tape 1 is preferably 0.5 mm or more and 2.5 mm or less. If this is within the numerical range, it is based on the fact that the winding effect is satisfactorily exhibited when the cartridge is wound around the tape reel of the cartridge. When the curvature amount is less than 0.5 mm, a good winding effect cannot be obtained. When the amount of curvature exceeds 2.5 mm, the contact with the cartridge reel becomes too strong and the edges are easily damaged, resulting in a decrease in winding property and an error rate. From the above, according to the knowledge of the present inventors, the curvature amount of the magnetic tape is preferably 0.5 to 2.5 mm, more preferably 0.8 to 2.0 mm, and most preferably 1.0 to 1.5 mm. .

  As described above, by using the winding method and the winding apparatus according to the present invention, it is possible to wind the magnetic tape around the tape reel with a certain amount of curvature. However, the amount of curvature may change depending on the temperature condition after winding, and a winding method of the magnetic tape that predicts the change and prevents this change is also possible. That is, when the magnetic tape is stored under high temperature conditions or when it is stored for a long time, the curvature amount may change at the center, center, and outer periphery of the winding (usually at the outer periphery of the winding). Indeed, the amount of kerbacha after storage tends to be smaller than the original amount of carburcha). For such inadvertent changes in the amount of curvature, take measures such as setting the amount of curvature given by the curvature applying means 6 to be small at the start of winding and large at the end of winding according to the winding length and storage conditions. It can respond. Such a winding method is also a concept included in the method of the present invention. In short, it is only necessary that the final curvature amount can be made constant.

  FIG. 1 shows a schematic configuration diagram of a magnetic tape winding device according to the present invention. In FIG. 1, the apparatus includes a supply shaft 2 around which a predetermined amount of magnetic tape 1 is wound, and a take-up shaft 3 that winds up the magnetic tape 1 fed from the supply shaft 2. The magnetic tape 1 delivered from the supply shaft 2 is conveyed from the supply shaft 2 at a predetermined speed and tension by a magnetic tape traveling system including a rotating roller 5 and a driving mechanism (not shown), and then wound around the take-up shaft 3. Taken.

  In the middle of the magnetic tape running system, in order from the upstream side, the magnetic tape 1 is heated to provide a halogen light source (curvature applying means) 6, and the magnetic tape 1 heated by the halogen light source 6 is cooled. An air pressure sensor (curvature amount detecting means) 9 for detecting the amount of curvature applied to the drum 7 and the magnetic tape 1 is disposed. The halogen light source 6 heats one side of the edge of the magnetic tape 1 under a predetermined condition to give a curvature, and is controlled by the light source control circuit 10. The surface of the cooling drum 7 is cooled by a Peltier element incorporated in the drum 7.

  As shown in FIG. 2, the air pressure sensor 9 is provided with a detection body 12 having a curved tape sliding surface 11 and upstream and downstream of the detection body 12, and presses the magnetic tape 1 against the tape sliding surface 11. It consists of a pair of guide rollers (guide means) 13 and 13 for running. The detection body 12 is a semi-disc-shaped metal block body, and is a blower that injects air toward one side surface (the upper surface (see FIG. 2 in the illustrated example)) of the magnetic tape 1 facing the tape sliding surface 11. A delivery passage 16 that communicates with the outlet 15 and an inflow passage 19 that communicates with an inflow port 17 that receives air flowing between the tape sliding surface 11 and the magnetic tape 1 are provided. As shown in FIG. 4, the air outlet 15 is a long hole formed long in the width direction of the magnetic tape 1, and blows air sent from the delivery passage 16 over the entire width direction of the magnetic tape 1. As shown in FIG. 3, the inflow ports 17 are arranged in the width direction of the magnetic tape 1, and these are arranged on the downstream side of the air outlet 15 of the tape sliding surface 11. As shown in FIGS. 2 and 3, a sensor 20 for detecting the pressure of the air flowing from the inflow port 17 is attached to the upper end of each inflow passage 19. 3 and 4, reference numeral 21 denotes a flange for preventing misalignment, which is formed to protrude at both end portions in the width direction of the magnetic tape sliding surface 11 to receive the edge portion of the magnetic tape 1.

  According to the air pressure sensor 9 configured as described above, when the magnetic tape 1 having a curvature passes through the magnetic tape sliding surface 11, the side of the tape on which the curvature becomes convex as shown in FIG. Is slightly lifted, and the air pressure detected by the sensor 20 on this side is detected to be smaller than the air pressure on the opposite side. The amount of curvature applied to the magnetic tape 1 can be detected from the amount of decrease in air pressure.

  The detection result of the air pressure detected by the sensor 20 is sent to the curvature amount detection calculation circuit 22 and converted into the curvature amount of the magnetic tape 1. Furthermore, the amount of curvature detected by the circuit 22 is compared with a set value stored in advance in a memory (not shown) of the circuit 22, and when the detected amount of curvature is larger than the set value, A control signal for reducing the output of the halogen light source 6 is transmitted toward the light source control circuit 10. Conversely, when the detected amount of curvature is smaller than the set value, a control signal for increasing the output of the halogen light source 6 is transmitted to the light source control circuit 10. Based on the control signal, the light source control circuit 10 controls the output of the halogen light source 6 to adjust the amount of curvature applied to the magnetic tape 1 to be large or small.

  In this winding device, the tension applied to the tape running system including the halogen light source 6 and the cooling drum 7 can be controlled to an arbitrary size by a tension control device (not shown). The tension at the time of winding the magnetic tape 1 on the winding shaft 3 can be set to an arbitrary magnitude.

  According to the magnetic tape winding apparatus according to the present embodiment having the above-described configuration, a curvature is applied to the magnetic tape 1 by the halogen light source 6 prior to winding of the magnetic tape 1, and further, the curvature is applied by the air pressure sensor 9. The amount is detected in real time, and the output of the halogen light source 6 is adjusted to be large or small based on the detection result, and the amount of curvature applied to the magnetic tape 1 is feedback controlled. Therefore, there is a variation in the amount of curvature that is preliminarily brazed to the magnetic tape 1 due to differences in the position in the width direction and the length direction of the original jumbo roll, and as a result, the halogen light source 6 causes the magnetic tape 1 to Even if the amount of curvature applied is deviated from the predetermined value, this is immediately detected by the air pressure sensor 9 and fed back to the light source control circuit 10 to correct the amount of curvature applied by the halogen light source 6 to an appropriate amount. can do. As a result, a suitable curvature amount can be accurately given over the entire length of the magnetic tape 1, and the magnetic tape 1 having excellent winding properties can be obtained.

  As described above, when the winding device is used, the magnetic tape 1 can be wound around the winding shaft 3 with a certain amount of curvature, but after being wound around the winding shaft 3, the magnetic tape 1 is stored at a high temperature or for a long time. In some cases, the curvature amount may change at the center, center, and outer periphery of the winding. Usually, the closer to the outer periphery of the winding, the smaller the amount of the stored curvature than the original amount of curvature. In such a case, the winding tension of the winding shaft is set to be strong at the beginning of winding and weakly at the end of winding, or the amount of applied carburcha is small at the beginning, depending on the winding length and storage conditions. It is preferable that the final curvature amount is made constant by optimizing the setting as appropriate, for example, by setting it large.

  The take-up shaft 3 can be a tape reel of a tape cartridge. In other words, the winding device and the winding method can be suitably applied as an apparatus and method for finally winding the magnetic tape 1 on a tape reel. According to this, since it is possible to minimize the problem that the curvature amount changes after winding, which is unavoidable when winding in the jumbo roll form, an appropriate curvature is applied to the magnetic tape 1 wound on the tape reel. As a result, it is possible to obtain the magnetic tape 1 having excellent winding properties. That is, the amount of curvature can be easily controlled, and a certain amount of curvature can be reliably imparted to the magnetic tape 1, so that the magnetic tape 1 having excellent winding properties can be obtained.

  As the curvature applying means, a conventionally known method such as contacting a laser beam or various heaters in addition to the halogen light source 6 can be used. As a method for controlling the amount of applied curvature, in addition to controlling the output of various heat sources, as long as the method controls the amount of heat applied to the magnetic tape, such as the distance between the heat source and the magnetic tape, the contact pressure between the heat source and the magnetic tape, The method is not particularly limited, and a known method is used. About the preferable range of heating conditions and tension, it is preferable to carry out under the conditions described in Patent Document 1 and Patent Document 2. Further, as the curvature applying means, means other than the above-mentioned heating, for example, a method in which a guide roller oblique to the traveling surface is disposed on the traveling path, and one edge of the magnetic tape is mechanically extended to impart a curvature. May be used.

  The cooling means is not particularly limited as long as it can be cooled in contact with or without contact with the magnetic tape 3, and a cooling plate, cold air, or the like can be used in addition to the cooling drum 7. The curvature amount detecting means is not particularly limited. In addition to the air pressure sensor 9 described above, the contact pressure of the regulating flange of the guide roller is measured, and the running position of the tape edge on the guide roll is determined by the position sensor. A conventionally known method such as detection by the method can be used.

It is a schematic block diagram which shows the winding method of the magnetic tape which concerns on this invention, and the winding apparatus of a magnetic tape. It is a vertical front view of an air pressure sensor. It is the sectional view on the AA line of FIG. It is a top view of an air pressure sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic tape 2 Supply axis | shaft 3 Winding axis | shaft 6 Curvature provision means (halogen light source)
9 Curvature detection means (air pressure sensor)

Claims (2)

A curvature applying step for applying a curvature to the magnetic tape fed from the supply shaft;
A curvature amount detecting step of detecting a curvature amount applied to the magnetic tape by the curvature applying step;
A step of winding the magnetic tape that has undergone the curvature detection step with a winding shaft,
In the curvature amount detection step, the amount of curvature is detected by an air pressure sensor,
The air pressure sensor includes a detection body including a tape sliding surface on which the magnetic tape is slid and a blowout port for blowing air to the magnetic tape sliding on the tape sliding surface. ,
Winding up a magnetic tape, wherein the amount of curvature applied to the magnetic tape in the curvature applying step is feedback controlled by the amount of heat applied to the magnetic tape based on the detection result of the curvature amount detecting step. Method. A magnetic tape take-up device having a tape running system from a supply shaft to a take-up shaft, and winding the magnetic tape fed from the supply shaft with the take-up shaft;
A midway portion of the tape running system is provided with a curvature applying means for applying a curvature to the magnetic tape, and disposed on the downstream side of the tape running system with respect to the curvature applying means, and applied to the magnetic tape by the curvature applying means. And a curvature amount detecting means for detecting the curvature amount.
The curvature amount detecting means detects a curvature amount by an air pressure sensor,
The air pressure sensor includes a detection body including a tape sliding surface on which the magnetic tape is slid and a blowout port for blowing air to the magnetic tape sliding on the tape sliding surface. ,
A magnetic tape winding device characterized in that, based on the detection result by the curvature amount detection means, the curvature amount given to the magnetic tape by the curvature applying means is feedback controlled by controlling the amount of heat given to the magnetic tape. .

Images