JP2006048732A - Method and device for winding magnetic tape to one reel cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for winding a magnetic tape to a one reel cartridge so as to eliminate the possibility of causing edge damage that an edge of the magnetic tape is turned even though a cartridge case drops. <P>SOLUTION: When a 1/2 inch-width magnetic tape is wound to a one reel cartridge, deceleration is suppressed to ≤1.3 m/s<SP>2</SP>. In a magnetic tape winding up device to a one reel cartridge provided as a device with a winding gear, a driving motor for rotating the winding gear and a control means for controlling the driving of the winding gear, the control means controls deceleration so as to be ≤1.3 m/s<SP>2</SP>when the driving motor is decelerated close to the end of winding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to winding a magnetic tape around a one-reel cartridge, and more particularly to a winding method and apparatus for preventing the winding form of a magnetic tape from being disturbed.

Conventionally, as a digital data backup device for personal computers, workstations, and large computers, a helical scan type magnetic tape device that is advantageous for realizing a large storage capacity has been used. As a magnetic tape used in such a magnetic table device, there is a one-reel cartridge in which a single reel is rotatably housed.
When such a one-reel cartridge is set in the magnetic recording apparatus, the leader block at the tip of the magnetic tape wound around the reel is pulled out of the cartridge by the drive mechanism on the magnetic recording apparatus side, and the recording apparatus Information is recorded in the magnetic recording unit, or information already recorded is read out in the reproducing unit, and after these purposes are completed, the magnetic tape is rewound onto the reel in the cartridge and again in the cartridge. It is configured to be stored.

  FIG. 1 is an exploded perspective view showing an example of the configuration of such a known magnetic tape cartridge. In the figure, a magnetic tape cartridge 10 is formed by winding a magnetic tape 9 around a single reel (cartridge reel) 40 in which an upper reel 41 and a lower reel 42 are joined by ultrasonic welding. A cartridge reel 40 is rotatably accommodated in a cartridge case 10 that is fastened with screws or the like.

  The lower reel 42 is formed by integrally molding a cylindrical reel hub 421 around which the magnetic tape 9 is wound and a flange portion 422 projecting radially from the outer periphery of the lower end of the reel hub 421 with a synthetic resin. A reel plate 53 for attracting and holding a magnet-type rotation driving means for rotating the tape cartridge reel 40 is attached to the outer surface. Further, a restraining gear 42A that engages with a restraining gear 52A formed on the brake button 52 and restrains rotation when not in use is formed on the inner surface of the bottom of the reel hub 421. The reel hub 421 is formed with an opening 42B through which a drive release spindle provided in a recording / reproducing device such as an external storage device using the magnetic tape cartridge 10 is inserted to move the brake button 52 upward. Yes.

When the cartridge reel 40 is not used, the brake button 52 is attached to the inside of the reel hub 421 while being urged downward in the drawing by the coil spring 51. Therefore, the restraining gear 52A and the reel hub 421 of the brake button 52 are mounted. The stop gear 42A engages with each other, and the rotation of the cartridge reel 40 is prevented.
On the other hand, when the cartridge is used, when the drive release spindle (not shown) of the recording / reproducing apparatus presses the brake button 52, the brake button 52 moves upward in the figure against the urging force of the coil spring 51, thereby restraining the brake button 52. The engagement between the gear 52A and the stopping gear 42A is released, and the cartridge reel 40 becomes rotatable.

  An opening 11 for pulling out the magnetic tape 9 is formed at one corner of the cartridge case 10, and a leader block 80 (or a leader pin) provided at the tip of the magnetic tape 9 is temporarily fixed to the opening 11. Has been. In use, the leader block locking pin 90 on the drive mechanism side of the recording / reproducing apparatus approaches the leader block 80 and engages with the concave portion of the leader block 80, and the leader block 80 is pulled out from the cartridge case 10. I will guide you through.

FIG. 2 is a schematic plan view for explaining the function of the magnetic recording apparatus loaded with the cartridge case. In the figure, 1 is a magnetic recording device, 2 is a cartridge loading unit, 3 is a winding unit, 6 is a machine reel, 7 is a read / write head, 8 is a guide roller, 9 is a magnetic tape, and 10 is a cartridge case.
When the cartridge case 10 is loaded into the loading unit 2 and started, the leader block locking pin 90 (FIG. 1) of the drive mechanism of the magnetic recording apparatus 1 pulls out the leader block 80 from the cartridge case 10 and a large number of guide rollers 8. The read / write head 7 is passed through and guided to the machine reel 6, and the leader block 80 is accommodated in the recess 6 b provided in the drum portion 6 a of the machine reel 6. In this state, the machine reel motor is rotationally driven to run the magnetic tape 9 to record / reproduce signals.

By the way, when winding the magnetic tape from the pancake to the cartridge case, the magnetic tape should be wound in contact with the lower flange, but for some reason, some of the tape jumps from the lower flange near the end of the tape winding. There was a turbulent winding that was rolled up in the state.
As a result of investigating the cause, the present applicant has found the following causes.

FIGS. 3A and 3B are diagrams for explaining the turbulent winding state, where FIG. 3A is a speed pattern diagram, FIG. 3B is a tension pattern diagram, and FIG. Figures (a) and (b) respectively correspond to the time that the magnetic tape is wound around the tape reel in (c).
In the figure, the cartridge reel 40 is composed of an upper reel 41 and a lower reel 42 comprising a reel hub 421 and a flange portion 422. The tip of the magnetic tape 9 is attached to the reel hub 421, and winding is started. .
The winding speed pattern is composed of acceleration v1 where the speed continues to increase, constant speed v2 where the maximum speed is constant, and deceleration v3 where the speed continues to decrease, as shown in (a). .

  Correspondingly, the tension pattern is configured from T1 when the tension continues to increase, T2 when the tension gradually decreases, and T3 when the tension gradually decreases as shown in FIG. Then, tension variation occurs at the time of transition from the tension T1 to the tension T2 and at the transition from the tension T2 to the time of the tension T3 that rapidly decreases.

In (c), the turbulent winding 9a occurs at the time of tension fluctuation at the time of transition from the tension T2 to the tension T3. However, there is also a tension fluctuation at the time of transition from the tension T1 to the tension T2, but no turbulent winding occurs during the tension fluctuation.
The reason why turbulent winding occurs at the transition from the tension T2 to the tension T3 and no turbulent winding occurs at the transition from the tension T1 to the tension T2 is because the latter has a short distance from the center of the cartridge reel 40 to the winding position. Therefore, such a fluctuation in tension does not affect the rotation of the reel 40, and therefore it is difficult to cause turbulent winding. On the other hand, the former has a long distance from the center of the cartridge reel 40 to the winding position. Therefore, it is considered that even the tension fluctuation of this level affects the rotation of the reel 40 and becomes a turbulent winding.

  I realized that this level of turbulence could be a problem. The reason will be described next.

FIG. 4 is a diagram illustrating a state where the edge of the magnetic tape falls on the floor.
As shown in the figure, the flange moves from the outer surface side (or inner surface side) to the inner surface side (or when the cartridge case 10 falls so that the tape reel 40 is parallel to the horizontal surface such as the floor surface or the ground. Since a large impact force is applied to the outer surface side, the lower flange 422 (FIG. 3) and the upper flange 41 (FIG. 3) of the tape reel 40 may momentarily be greatly deformed in the vertical direction. If it does so, the upper flange 41 might contact the tape protrusion part 9a (FIG. 3) at the time of the deformation | transformation, and the edge damage (tape edge) of the magnetic tape 9 (FIG. 3) might bend.

  As described with reference to FIG. 2, the magnetic tape in which such edge damage has occurred is transported by the guide roller 8 inside the magnetic recording apparatus 1 (FIG. 2) for performing magnetic recording. A phenomenon occurs in which the magnetic tape 9 traveling in response to sliding with the peripheral surface of the guide roller 8 vibrates in the width direction (axial direction of the guide roller), and the magnetic recording head 7 is turned off with respect to the magnetic tape 9. Tracked and sometimes resulted in tracking errors.

  In photographic films and the like, as shown in the following Patent Documents 1 and 2, it has been proposed that knurling or unevenness is provided on the surfaces of both ends of a bulk roll for photographic films. Thereby, it is supposed that winding deviation etc. are prevented.

JP 2002-68538 A JP-A-11-262950

  However, even if the inventions described in Patent Documents 1 and 2 relate to countermeasures against turbulent winding of photographic film, they are easily damaged by edge because they are thin magnetic tapes, and therefore, countermeasures against turbulent winding during winding are necessary. This is completely different from the present invention.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic tape winding method and apparatus capable of winding the magnetic tape so that there is no turbulent winding (flying portion). .

In order to achieve the above object, a first aspect of the present invention relates to a method for winding a one-reel cartridge on a magnetic tape. When a 1/2 inch wide magnetic tape is wound on a one-reel cartridge, the deceleration is 1.3 m. / S ² or less.
According to a second aspect of the present invention, in the magnetic tape winding method for a one-reel cartridge according to the first aspect, the increase in the winding time is compensated by increasing the winding speed.

The invention according to claim 3 relates to a magnetic tape winding device, and relates to a one-reel cartridge provided with a winding gear, a drive motor for rotating the winding gear, and a control means for driving and controlling the motor. In the magnetic tape winding apparatus, the control means controls the deceleration to be 1.3 m / s ² or less when the drive motor decelerates near the end of winding.

By configuring as described above, the above-mentioned protruding portion of the magnetic tape is eliminated, so that edge damage is not caused even by an impact caused by dropping.
In addition, when the deceleration is suppressed to 1.3 m / s ² or less, the winding time during deceleration becomes longer. By increasing the acceleration during acceleration, the entire winding time can be made the same as the conventional one.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 5 is a graph showing the relationship between the tension fluctuation and the deceleration obtained as a result of the experiment conducted by the present applicant. In the figure, the vertical axis represents tension fluctuation (g / sec), and the horizontal axis represents deceleration (m / s ² ). From the figure, it was found that the tension fluctuation increased in proportion to the increase in deceleration.

6A and 6B are diagrams showing a speed pattern and a tension pattern from the start to the end of winding of a 1/2 inch width tape obtained as a result of an experiment conducted by the present applicant. FIG. 6A shows a case where acceleration / deceleration is 2 m / s ² , b) is the case of 1 m / s ² .
In both figures, the vertical axis indicates the speed (m / s) indicated by the solid line, the tension (g) indicated by the dotted line, and the horizontal axis indicates the passage of time from the start to the end of winding. The winding speed is 10 m / s in both figures.
In the case of (a), the rise (acceleration) until reaching the hoisting speed (10 m / s) and the fall (deceleration) from the hoisting speed to zero are steep, so as can be seen from FIG. Tension fluctuation increases.
On the other hand, in the case of (b), the rise (acceleration) until reaching the hoisting speed (10 m / s) and the fall (deceleration) from the hoisting speed to zero are gentle, and can be seen from FIG. As described above, the variation in tension is reduced.

FIG. 7 shows the profile of the tape winding surface shape corresponding to (a) and (b) of FIG. 6, (a) is when acceleration / deceleration is 2 m / s ² , and (b) is 1 m / s ² . Is the case.
In the figure, the vertical axis represents the amount of projection from the winding surface 0, and the horizontal axis represents the distance from the hugging position (left) of the take-up reel.
In the case of (a), a large turbulence occurs at the deceleration start point, but in the case of (b), it can be seen that there is almost no turbulence.

  The reason why the winding disturbance occurs in this way is that the speed control (brake control) is on the sending side and the tension control is on the winding side. The tension control is performed smoothly by sensing the speed and slowing the hoisting speed of the hoisting heater. On the other hand, if the brake is suddenly applied on the sending side, it is assumed that the tension control cannot follow this. Is done.

  In FIG. 6, a large tension is generated immediately before the start of winding, but since winding has not yet been performed, there is no problem of turbulent winding in both figures in FIG.

From the above, 1/2-inch wide wind the tape, the winding disturbance occurs during deceleration of 2m / s ^2, it can be seen that the disturbance winding as a deceleration of 1 m / s ² is eliminated.
As a result of additional experiments, it was found that the deceleration is preferably 1.3 m / s ² or less.

Therefore, according to the present invention, when winding a 1/2 inch wide magnetic tape around a one-reel cartridge, the tension is controlled smoothly by suppressing the deceleration to 1.3 m / s ² or less. As a result, there is no risk of edge damage caused by bending of the edge of the magnetic tape even if the cartridge case falls.

Further, when the deceleration is 1.3 m / s ² or less, the winding time is increased as compared with the conventional case. However, when it is desired to avoid this, the increase can be compensated for by increasing the winding speed.

FIG. 8 is a diagram for explaining how much the winding speed should be increased in order to make the winding end time the same as that of the conventional method. (A) is the conventional method, (b) is the first embodiment, (c) is the first method. In both examples, the vertical axis represents speed, and the horizontal axis represents winding time.
In the conventional method (a), the speed increases from a to b, proceeds to bc at the winding speed, decelerates from c to d, and the winding is finished. The total length of the wound magnetic tape is the area of the trapezoid abcd.

In (b) of the first embodiment, (b) the speed increases from a to b, proceeds to b-c1 at the winding speed, proceeds from c1 to d1 at a deceleration of 1.3 m / s ² , and the winding is performed It has ended. The total length of the wound magnetic tape is the area of the trapezoid abc1d1, which is equal to the area of the trapezoid abcd. (B) The speed increases from a to b, proceeds to b-c2 at the winding speed, proceeds from c2 to d2 at a deceleration of 1.0 m / s ² , and the winding is finished. The total length of the wound magnetic tape is the area of the trapezoid abc2d2, which is equal to the area of the trapezoid abcd.
In (A) and (B), the time until the end of winding is increased by d-d1 minutes for (A) and by d-D2 for (B), compared to the conventional method.

In the second embodiment (c), the winding time is increased in order to match the time until the end of winding with the conventional method. Passing from a to b and further increasing the speed to b1, at this winding speed, proceed to b1-c4, and proceed from c4 to d at a deceleration of 1.3 m / s ² . The total length of the wound magnetic tape is the area of the trapezoid ab1c4d and is equal to the area of the trapezoid abcd.
By doing in this way, even if it decelerates by deceleration 1.3m / s < ² >, winding will be performed in the same time as the conventional method.

The hoisting device that implements the hoisting method described above can be realized as follows.
As the winding device itself, the same winding device as the conventional one can be used. That is, a winding gear that meshes with the cartridge reel, a drive motor that rotates the winding gear, and a control unit that controls the driving of the motor are used, and the control unit controls the drive motor near the end of winding. When decelerating, the deceleration may be controlled to 1.3 m / s ² or less, which is extremely small as compared with the conventional method. By doing in this way, even if a cartridge case falls, the one reel cartridge which does not have a possibility of the edge damage which the edge of a magnetic tape bends will be easily obtained.

It is a disassembled perspective view which shows an example of a structure of the magnetic tape cartridge which this invention makes object. It is a schematic plan view explaining the function of the magnetic recording apparatus which drives the magnetic tape cartridge of FIG. It is a figure explaining the disorder | damage winding state of a magnetic tape. It is a figure explaining a fall state in case a magnetic tape edge is bent. It is a graph which shows the relationship of tension fluctuation | variation versus deceleration. 1/2 From winding start inch wide tape a diagram showing a speed pattern and a tension pattern to the end (a) is acceleration or deceleration of 2m / s ^2, (b) is a case of 1 m / s ^2. It is a figure which shows the profile of the tape winding surface shape corresponding to (a) of FIG. 6, (b). It is a figure explaining how much winding speed should be increased in order to make winding end time the same as a conventional method, (a) is a conventional method, (b) is the 1st example, (c) is the 2nd example. In either case, the vertical axis represents speed, and the horizontal axis represents winding time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic recording apparatus 2 Cartridge loading part 3 Winding part 6 Machine reel 7 Read / write head 8 Guide roller 9 Magnetic tape 10 Cartridge case 11 Opening part 20 Upper case 30 Lower case 40 Single reel (one reel, cartridge reel)
41 Upper reel 42 Lower reel 42A Stopping gear 42B Opening 421 Reel hub 422 Flange 52 Brake button 53 Reel plate 51 Coil spring 52A Stopping gear 80 Leader block 90 Leader block locking pin

Claims (3)

A magnetic tape winding method for a one-reel cartridge, wherein a deceleration is suppressed to 1.3 m / s ² or less when a magnetic tape having a width of 1/2 inch is wound on a one-reel cartridge. ^2. The magnetic tape winding method for a one-reel cartridge according to claim 1, wherein an increase in winding time due to a deceleration of 1.3 m / s < ² > or less is compensated by increasing the winding speed. In a magnetic tape winding device for a one-reel cartridge comprising a winding gear, a drive motor that rotates the winding gear, and a control unit that drives and controls the motor.
The magnetic tape winding device characterized in that the control means controls the deceleration to be 1.3 m / s ² or less when the drive motor decelerates near the end of winding.

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